Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

59 files changed, 40703 insertions, 0 deletions

diff --git a/kernel/net/sunrpc/Kconfig b/kernel/net/sunrpc/Kconfig
new file mode 100644
index 000000000..9068e72aa
--- /dev/null
+++ b/kernel/net/sunrpc/Kconfig
@@ -0,0 +1,75 @@
+config SUNRPC
+	tristate
+	depends on MULTIUSER
+
+config SUNRPC_GSS
+	tristate
+	select OID_REGISTRY
+	depends on MULTIUSER
+
+config SUNRPC_BACKCHANNEL
+	bool
+	depends on SUNRPC
+
+config SUNRPC_SWAP
+	bool
+	depends on SUNRPC
+
+config RPCSEC_GSS_KRB5
+	tristate "Secure RPC: Kerberos V mechanism"
+	depends on SUNRPC && CRYPTO
+	depends on CRYPTO_MD5 && CRYPTO_DES && CRYPTO_CBC && CRYPTO_CTS
+	depends on CRYPTO_ECB && CRYPTO_HMAC && CRYPTO_SHA1 && CRYPTO_AES
+	depends on CRYPTO_ARC4
+	default y
+	select SUNRPC_GSS
+	help
+	  Choose Y here to enable Secure RPC using the Kerberos version 5
+	  GSS-API mechanism (RFC 1964).
+
+	  Secure RPC calls with Kerberos require an auxiliary user-space
+	  daemon which may be found in the Linux nfs-utils package
+	  available from http://linux-nfs.org/.  In addition, user-space
+	  Kerberos support should be installed.
+
+	  If unsure, say Y.
+
+config SUNRPC_DEBUG
+	bool "RPC: Enable dprintk debugging"
+	depends on SUNRPC && SYSCTL
+	select DEBUG_FS
+	help
+	  This option enables a sysctl-based debugging interface
+	  that is be used by the 'rpcdebug' utility to turn on or off
+	  logging of different aspects of the kernel RPC activity.
+
+	  Disabling this option will make your kernel slightly smaller,
+	  but makes troubleshooting NFS issues significantly harder.
+
+	  If unsure, say Y.
+
+config SUNRPC_XPRT_RDMA_CLIENT
+	tristate "RPC over RDMA Client Support"
+	depends on SUNRPC && INFINIBAND && INFINIBAND_ADDR_TRANS
+	default SUNRPC && INFINIBAND
+	help
+	  This option allows the NFS client to support an RDMA-enabled
+	  transport.
+
+	  To compile RPC client RDMA transport support as a module,
+	  choose M here: the module will be called xprtrdma.
+
+	  If unsure, say N.
+
+config SUNRPC_XPRT_RDMA_SERVER
+	tristate "RPC over RDMA Server Support"
+	depends on SUNRPC && INFINIBAND && INFINIBAND_ADDR_TRANS
+	default SUNRPC && INFINIBAND
+	help
+	  This option allows the NFS server to support an RDMA-enabled
+	  transport.
+
+	  To compile RPC server RDMA transport support as a module,
+	  choose M here: the module will be called svcrdma.
+
+	  If unsure, say N.
diff --git a/kernel/net/sunrpc/Makefile b/kernel/net/sunrpc/Makefile
new file mode 100644
index 000000000..15e6f6c23
--- /dev/null
+++ b/kernel/net/sunrpc/Makefile
@@ -0,0 +1,20 @@
+#
+# Makefile for Linux kernel SUN RPC
+#
+
+
+obj-$(CONFIG_SUNRPC) += sunrpc.o
+obj-$(CONFIG_SUNRPC_GSS) += auth_gss/
+
+obj-y += xprtrdma/
+
+sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \
+	    auth.o auth_null.o auth_unix.o auth_generic.o \
+	    svc.o svcsock.o svcauth.o svcauth_unix.o \
+	    addr.o rpcb_clnt.o timer.o xdr.o \
+	    sunrpc_syms.o cache.o rpc_pipe.o \
+	    svc_xprt.o
+sunrpc-$(CONFIG_SUNRPC_DEBUG) += debugfs.o
+sunrpc-$(CONFIG_SUNRPC_BACKCHANNEL) += backchannel_rqst.o bc_svc.o
+sunrpc-$(CONFIG_PROC_FS) += stats.o
+sunrpc-$(CONFIG_SYSCTL) += sysctl.o
diff --git a/kernel/net/sunrpc/addr.c b/kernel/net/sunrpc/addr.c
new file mode 100644
index 000000000..2e0a6f92e
--- /dev/null
+++ b/kernel/net/sunrpc/addr.c
@@ -0,0 +1,357 @@
+/*
+ * Copyright 2009, Oracle.  All rights reserved.
+ *
+ * Convert socket addresses to presentation addresses and universal
+ * addresses, and vice versa.
+ *
+ * Universal addresses are introduced by RFC 1833 and further refined by
+ * recent RFCs describing NFSv4.  The universal address format is part
+ * of the external (network) interface provided by rpcbind version 3
+ * and 4, and by NFSv4.  Such an address is a string containing a
+ * presentation format IP address followed by a port number in
+ * "hibyte.lobyte" format.
+ *
+ * IPv6 addresses can also include a scope ID, typically denoted by
+ * a '%' followed by a device name or a non-negative integer.  Refer to
+ * RFC 4291, Section 2.2 for details on IPv6 presentation formats.
+ */
+
+#include <net/ipv6.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+
+static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
+				  char *buf, const int buflen)
+{
+	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+	const struct in6_addr *addr = &sin6->sin6_addr;
+
+	/*
+	 * RFC 4291, Section 2.2.2
+	 *
+	 * Shorthanded ANY address
+	 */
+	if (ipv6_addr_any(addr))
+		return snprintf(buf, buflen, "::");
+
+	/*
+	 * RFC 4291, Section 2.2.2
+	 *
+	 * Shorthanded loopback address
+	 */
+	if (ipv6_addr_loopback(addr))
+		return snprintf(buf, buflen, "::1");
+
+	/*
+	 * RFC 4291, Section 2.2.3
+	 *
+	 * Special presentation address format for mapped v4
+	 * addresses.
+	 */
+	if (ipv6_addr_v4mapped(addr))
+		return snprintf(buf, buflen, "::ffff:%pI4",
+					&addr->s6_addr32[3]);
+
+	/*
+	 * RFC 4291, Section 2.2.1
+	 */
+	return snprintf(buf, buflen, "%pI6c", addr);
+}
+
+static size_t rpc_ntop6(const struct sockaddr *sap,
+			char *buf, const size_t buflen)
+{
+	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+	char scopebuf[IPV6_SCOPE_ID_LEN];
+	size_t len;
+	int rc;
+
+	len = rpc_ntop6_noscopeid(sap, buf, buflen);
+	if (unlikely(len == 0))
+		return len;
+
+	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
+		return len;
+	if (sin6->sin6_scope_id == 0)
+		return len;
+
+	rc = snprintf(scopebuf, sizeof(scopebuf), "%c%u",
+			IPV6_SCOPE_DELIMITER, sin6->sin6_scope_id);
+	if (unlikely((size_t)rc > sizeof(scopebuf)))
+		return 0;
+
+	len += rc;
+	if (unlikely(len > buflen))
+		return 0;
+
+	strcat(buf, scopebuf);
+	return len;
+}
+
+#else	/* !IS_ENABLED(CONFIG_IPV6) */
+
+static size_t rpc_ntop6_noscopeid(const struct sockaddr *sap,
+				  char *buf, const int buflen)
+{
+	return 0;
+}
+
+static size_t rpc_ntop6(const struct sockaddr *sap,
+			char *buf, const size_t buflen)
+{
+	return 0;
+}
+
+#endif	/* !IS_ENABLED(CONFIG_IPV6) */
+
+static int rpc_ntop4(const struct sockaddr *sap,
+		     char *buf, const size_t buflen)
+{
+	const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+
+	return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
+}
+
+/**
+ * rpc_ntop - construct a presentation address in @buf
+ * @sap: socket address
+ * @buf: construction area
+ * @buflen: size of @buf, in bytes
+ *
+ * Plants a %NUL-terminated string in @buf and returns the length
+ * of the string, excluding the %NUL.  Otherwise zero is returned.
+ */
+size_t rpc_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+	switch (sap->sa_family) {
+	case AF_INET:
+		return rpc_ntop4(sap, buf, buflen);
+	case AF_INET6:
+		return rpc_ntop6(sap, buf, buflen);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_ntop);
+
+static size_t rpc_pton4(const char *buf, const size_t buflen,
+			struct sockaddr *sap, const size_t salen)
+{
+	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+	u8 *addr = (u8 *)&sin->sin_addr.s_addr;
+
+	if (buflen > INET_ADDRSTRLEN || salen < sizeof(struct sockaddr_in))
+		return 0;
+
+	memset(sap, 0, sizeof(struct sockaddr_in));
+
+	if (in4_pton(buf, buflen, addr, '\0', NULL) == 0)
+		return 0;
+
+	sin->sin_family = AF_INET;
+	return sizeof(struct sockaddr_in);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int rpc_parse_scope_id(struct net *net, const char *buf,
+			      const size_t buflen, const char *delim,
+			      struct sockaddr_in6 *sin6)
+{
+	char *p;
+	size_t len;
+
+	if ((buf + buflen) == delim)
+		return 1;
+
+	if (*delim != IPV6_SCOPE_DELIMITER)
+		return 0;
+
+	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
+		return 0;
+
+	len = (buf + buflen) - delim - 1;
+	p = kstrndup(delim + 1, len, GFP_KERNEL);
+	if (p) {
+		u32 scope_id = 0;
+		struct net_device *dev;
+
+		dev = dev_get_by_name(net, p);
+		if (dev != NULL) {
+			scope_id = dev->ifindex;
+			dev_put(dev);
+		} else {
+			if (kstrtou32(p, 10, &scope_id) == 0) {
+				kfree(p);
+				return 0;
+			}
+		}
+
+		kfree(p);
+
+		sin6->sin6_scope_id = scope_id;
+		return 1;
+	}
+
+	return 0;
+}
+
+static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
+			struct sockaddr *sap, const size_t salen)
+{
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+	u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
+	const char *delim;
+
+	if (buflen > (INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN) ||
+	    salen < sizeof(struct sockaddr_in6))
+		return 0;
+
+	memset(sap, 0, sizeof(struct sockaddr_in6));
+
+	if (in6_pton(buf, buflen, addr, IPV6_SCOPE_DELIMITER, &delim) == 0)
+		return 0;
+
+	if (!rpc_parse_scope_id(net, buf, buflen, delim, sin6))
+		return 0;
+
+	sin6->sin6_family = AF_INET6;
+	return sizeof(struct sockaddr_in6);
+}
+#else
+static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,
+			struct sockaddr *sap, const size_t salen)
+{
+	return 0;
+}
+#endif
+
+/**
+ * rpc_pton - Construct a sockaddr in @sap
+ * @net: applicable network namespace
+ * @buf: C string containing presentation format IP address
+ * @buflen: length of presentation address in bytes
+ * @sap: buffer into which to plant socket address
+ * @salen: size of buffer in bytes
+ *
+ * Returns the size of the socket address if successful; otherwise
+ * zero is returned.
+ *
+ * Plants a socket address in @sap and returns the size of the
+ * socket address, if successful.  Returns zero if an error
+ * occurred.
+ */
+size_t rpc_pton(struct net *net, const char *buf, const size_t buflen,
+		struct sockaddr *sap, const size_t salen)
+{
+	unsigned int i;
+
+	for (i = 0; i < buflen; i++)
+		if (buf[i] == ':')
+			return rpc_pton6(net, buf, buflen, sap, salen);
+	return rpc_pton4(buf, buflen, sap, salen);
+}
+EXPORT_SYMBOL_GPL(rpc_pton);
+
+/**
+ * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
+ * @sap: socket address
+ * @gfp_flags: allocation mode
+ *
+ * Returns a %NUL-terminated string in dynamically allocated memory;
+ * otherwise NULL is returned if an error occurred.  Caller must
+ * free the returned string.
+ */
+char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
+{
+	char portbuf[RPCBIND_MAXUADDRPLEN];
+	char addrbuf[RPCBIND_MAXUADDRLEN];
+	unsigned short port;
+
+	switch (sap->sa_family) {
+	case AF_INET:
+		if (rpc_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
+			return NULL;
+		port = ntohs(((struct sockaddr_in *)sap)->sin_port);
+		break;
+	case AF_INET6:
+		if (rpc_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
+			return NULL;
+		port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
+		break;
+	default:
+		return NULL;
+	}
+
+	if (snprintf(portbuf, sizeof(portbuf),
+		     ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
+		return NULL;
+
+	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
+		return NULL;
+
+	return kstrdup(addrbuf, gfp_flags);
+}
+
+/**
+ * rpc_uaddr2sockaddr - convert a universal address to a socket address.
+ * @net: applicable network namespace
+ * @uaddr: C string containing universal address to convert
+ * @uaddr_len: length of universal address string
+ * @sap: buffer into which to plant socket address
+ * @salen: size of buffer
+ *
+ * @uaddr does not have to be '\0'-terminated, but kstrtou8() and
+ * rpc_pton() require proper string termination to be successful.
+ *
+ * Returns the size of the socket address if successful; otherwise
+ * zero is returned.
+ */
+size_t rpc_uaddr2sockaddr(struct net *net, const char *uaddr,
+			  const size_t uaddr_len, struct sockaddr *sap,
+			  const size_t salen)
+{
+	char *c, buf[RPCBIND_MAXUADDRLEN + sizeof('\0')];
+	u8 portlo, porthi;
+	unsigned short port;
+
+	if (uaddr_len > RPCBIND_MAXUADDRLEN)
+		return 0;
+
+	memcpy(buf, uaddr, uaddr_len);
+
+	buf[uaddr_len] = '\0';
+	c = strrchr(buf, '.');
+	if (unlikely(c == NULL))
+		return 0;
+	if (unlikely(kstrtou8(c + 1, 10, &portlo) != 0))
+		return 0;
+
+	*c = '\0';
+	c = strrchr(buf, '.');
+	if (unlikely(c == NULL))
+		return 0;
+	if (unlikely(kstrtou8(c + 1, 10, &porthi) != 0))
+		return 0;
+
+	port = (unsigned short)((porthi << 8) | portlo);
+
+	*c = '\0';
+	if (rpc_pton(net, buf, strlen(buf), sap, salen) == 0)
+		return 0;
+
+	switch (sap->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)sap)->sin_port = htons(port);
+		return sizeof(struct sockaddr_in);
+	case AF_INET6:
+		((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
+		return sizeof(struct sockaddr_in6);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_uaddr2sockaddr);
diff --git a/kernel/net/sunrpc/auth.c b/kernel/net/sunrpc/auth.c
new file mode 100644
index 000000000..47f38be41
--- /dev/null
+++ b/kernel/net/sunrpc/auth.c
@@ -0,0 +1,891 @@
+/*
+ * linux/net/sunrpc/auth.c
+ *
+ * Generic RPC client authentication API.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/hash.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/spinlock.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define RPC_CREDCACHE_DEFAULT_HASHBITS	(4)
+struct rpc_cred_cache {
+	struct hlist_head	*hashtable;
+	unsigned int		hashbits;
+	spinlock_t		lock;
+};
+
+static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS;
+
+static DEFINE_SPINLOCK(rpc_authflavor_lock);
+static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
+	&authnull_ops,		/* AUTH_NULL */
+	&authunix_ops,		/* AUTH_UNIX */
+	NULL,			/* others can be loadable modules */
+};
+
+static LIST_HEAD(cred_unused);
+static unsigned long number_cred_unused;
+
+#define MAX_HASHTABLE_BITS (14)
+static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp)
+{
+	unsigned long num;
+	unsigned int nbits;
+	int ret;
+
+	if (!val)
+		goto out_inval;
+	ret = kstrtoul(val, 0, &num);
+	if (ret == -EINVAL)
+		goto out_inval;
+	nbits = fls(num);
+	if (num > (1U << nbits))
+		nbits++;
+	if (nbits > MAX_HASHTABLE_BITS || nbits < 2)
+		goto out_inval;
+	*(unsigned int *)kp->arg = nbits;
+	return 0;
+out_inval:
+	return -EINVAL;
+}
+
+static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp)
+{
+	unsigned int nbits;
+
+	nbits = *(unsigned int *)kp->arg;
+	return sprintf(buffer, "%u", 1U << nbits);
+}
+
+#define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int);
+
+static struct kernel_param_ops param_ops_hashtbl_sz = {
+	.set = param_set_hashtbl_sz,
+	.get = param_get_hashtbl_sz,
+};
+
+module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644);
+MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size");
+
+static unsigned long auth_max_cred_cachesize = ULONG_MAX;
+module_param(auth_max_cred_cachesize, ulong, 0644);
+MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size");
+
+static u32
+pseudoflavor_to_flavor(u32 flavor) {
+	if (flavor > RPC_AUTH_MAXFLAVOR)
+		return RPC_AUTH_GSS;
+	return flavor;
+}
+
+int
+rpcauth_register(const struct rpc_authops *ops)
+{
+	rpc_authflavor_t flavor;
+	int ret = -EPERM;
+
+	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+		return -EINVAL;
+	spin_lock(&rpc_authflavor_lock);
+	if (auth_flavors[flavor] == NULL) {
+		auth_flavors[flavor] = ops;
+		ret = 0;
+	}
+	spin_unlock(&rpc_authflavor_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpcauth_register);
+
+int
+rpcauth_unregister(const struct rpc_authops *ops)
+{
+	rpc_authflavor_t flavor;
+	int ret = -EPERM;
+
+	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
+		return -EINVAL;
+	spin_lock(&rpc_authflavor_lock);
+	if (auth_flavors[flavor] == ops) {
+		auth_flavors[flavor] = NULL;
+		ret = 0;
+	}
+	spin_unlock(&rpc_authflavor_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpcauth_unregister);
+
+/**
+ * rpcauth_get_pseudoflavor - check if security flavor is supported
+ * @flavor: a security flavor
+ * @info: a GSS mech OID, quality of protection, and service value
+ *
+ * Verifies that an appropriate kernel module is available or already loaded.
+ * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is
+ * not supported locally.
+ */
+rpc_authflavor_t
+rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info)
+{
+	const struct rpc_authops *ops;
+	rpc_authflavor_t pseudoflavor;
+
+	ops = auth_flavors[flavor];
+	if (ops == NULL)
+		request_module("rpc-auth-%u", flavor);
+	spin_lock(&rpc_authflavor_lock);
+	ops = auth_flavors[flavor];
+	if (ops == NULL || !try_module_get(ops->owner)) {
+		spin_unlock(&rpc_authflavor_lock);
+		return RPC_AUTH_MAXFLAVOR;
+	}
+	spin_unlock(&rpc_authflavor_lock);
+
+	pseudoflavor = flavor;
+	if (ops->info2flavor != NULL)
+		pseudoflavor = ops->info2flavor(info);
+
+	module_put(ops->owner);
+	return pseudoflavor;
+}
+EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor);
+
+/**
+ * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor
+ * @pseudoflavor: GSS pseudoflavor to match
+ * @info: rpcsec_gss_info structure to fill in
+ *
+ * Returns zero and fills in "info" if pseudoflavor matches a
+ * supported mechanism.
+ */
+int
+rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info)
+{
+	rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor);
+	const struct rpc_authops *ops;
+	int result;
+
+	if (flavor >= RPC_AUTH_MAXFLAVOR)
+		return -EINVAL;
+
+	ops = auth_flavors[flavor];
+	if (ops == NULL)
+		request_module("rpc-auth-%u", flavor);
+	spin_lock(&rpc_authflavor_lock);
+	ops = auth_flavors[flavor];
+	if (ops == NULL || !try_module_get(ops->owner)) {
+		spin_unlock(&rpc_authflavor_lock);
+		return -ENOENT;
+	}
+	spin_unlock(&rpc_authflavor_lock);
+
+	result = -ENOENT;
+	if (ops->flavor2info != NULL)
+		result = ops->flavor2info(pseudoflavor, info);
+
+	module_put(ops->owner);
+	return result;
+}
+EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo);
+
+/**
+ * rpcauth_list_flavors - discover registered flavors and pseudoflavors
+ * @array: array to fill in
+ * @size: size of "array"
+ *
+ * Returns the number of array items filled in, or a negative errno.
+ *
+ * The returned array is not sorted by any policy.  Callers should not
+ * rely on the order of the items in the returned array.
+ */
+int
+rpcauth_list_flavors(rpc_authflavor_t *array, int size)
+{
+	rpc_authflavor_t flavor;
+	int result = 0;
+
+	spin_lock(&rpc_authflavor_lock);
+	for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) {
+		const struct rpc_authops *ops = auth_flavors[flavor];
+		rpc_authflavor_t pseudos[4];
+		int i, len;
+
+		if (result >= size) {
+			result = -ENOMEM;
+			break;
+		}
+
+		if (ops == NULL)
+			continue;
+		if (ops->list_pseudoflavors == NULL) {
+			array[result++] = ops->au_flavor;
+			continue;
+		}
+		len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos));
+		if (len < 0) {
+			result = len;
+			break;
+		}
+		for (i = 0; i < len; i++) {
+			if (result >= size) {
+				result = -ENOMEM;
+				break;
+			}
+			array[result++] = pseudos[i];
+		}
+	}
+	spin_unlock(&rpc_authflavor_lock);
+
+	dprintk("RPC:       %s returns %d\n", __func__, result);
+	return result;
+}
+EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
+
+struct rpc_auth *
+rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	struct rpc_auth		*auth;
+	const struct rpc_authops *ops;
+	u32			flavor = pseudoflavor_to_flavor(args->pseudoflavor);
+
+	auth = ERR_PTR(-EINVAL);
+	if (flavor >= RPC_AUTH_MAXFLAVOR)
+		goto out;
+
+	if ((ops = auth_flavors[flavor]) == NULL)
+		request_module("rpc-auth-%u", flavor);
+	spin_lock(&rpc_authflavor_lock);
+	ops = auth_flavors[flavor];
+	if (ops == NULL || !try_module_get(ops->owner)) {
+		spin_unlock(&rpc_authflavor_lock);
+		goto out;
+	}
+	spin_unlock(&rpc_authflavor_lock);
+	auth = ops->create(args, clnt);
+	module_put(ops->owner);
+	if (IS_ERR(auth))
+		return auth;
+	if (clnt->cl_auth)
+		rpcauth_release(clnt->cl_auth);
+	clnt->cl_auth = auth;
+
+out:
+	return auth;
+}
+EXPORT_SYMBOL_GPL(rpcauth_create);
+
+void
+rpcauth_release(struct rpc_auth *auth)
+{
+	if (!atomic_dec_and_test(&auth->au_count))
+		return;
+	auth->au_ops->destroy(auth);
+}
+
+static DEFINE_SPINLOCK(rpc_credcache_lock);
+
+static void
+rpcauth_unhash_cred_locked(struct rpc_cred *cred)
+{
+	hlist_del_rcu(&cred->cr_hash);
+	smp_mb__before_atomic();
+	clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
+}
+
+static int
+rpcauth_unhash_cred(struct rpc_cred *cred)
+{
+	spinlock_t *cache_lock;
+	int ret;
+
+	cache_lock = &cred->cr_auth->au_credcache->lock;
+	spin_lock(cache_lock);
+	ret = atomic_read(&cred->cr_count) == 0;
+	if (ret)
+		rpcauth_unhash_cred_locked(cred);
+	spin_unlock(cache_lock);
+	return ret;
+}
+
+/*
+ * Initialize RPC credential cache
+ */
+int
+rpcauth_init_credcache(struct rpc_auth *auth)
+{
+	struct rpc_cred_cache *new;
+	unsigned int hashsize;
+
+	new = kmalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		goto out_nocache;
+	new->hashbits = auth_hashbits;
+	hashsize = 1U << new->hashbits;
+	new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL);
+	if (!new->hashtable)
+		goto out_nohashtbl;
+	spin_lock_init(&new->lock);
+	auth->au_credcache = new;
+	return 0;
+out_nohashtbl:
+	kfree(new);
+out_nocache:
+	return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(rpcauth_init_credcache);
+
+/*
+ * Setup a credential key lifetime timeout notification
+ */
+int
+rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+	if (!cred->cr_auth->au_ops->key_timeout)
+		return 0;
+	return cred->cr_auth->au_ops->key_timeout(auth, cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
+
+bool
+rpcauth_cred_key_to_expire(struct rpc_cred *cred)
+{
+	if (!cred->cr_ops->crkey_to_expire)
+		return false;
+	return cred->cr_ops->crkey_to_expire(cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
+
+char *
+rpcauth_stringify_acceptor(struct rpc_cred *cred)
+{
+	if (!cred->cr_ops->crstringify_acceptor)
+		return NULL;
+	return cred->cr_ops->crstringify_acceptor(cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor);
+
+/*
+ * Destroy a list of credentials
+ */
+static inline
+void rpcauth_destroy_credlist(struct list_head *head)
+{
+	struct rpc_cred *cred;
+
+	while (!list_empty(head)) {
+		cred = list_entry(head->next, struct rpc_cred, cr_lru);
+		list_del_init(&cred->cr_lru);
+		put_rpccred(cred);
+	}
+}
+
+/*
+ * Clear the RPC credential cache, and delete those credentials
+ * that are not referenced.
+ */
+void
+rpcauth_clear_credcache(struct rpc_cred_cache *cache)
+{
+	LIST_HEAD(free);
+	struct hlist_head *head;
+	struct rpc_cred	*cred;
+	unsigned int hashsize = 1U << cache->hashbits;
+	int		i;
+
+	spin_lock(&rpc_credcache_lock);
+	spin_lock(&cache->lock);
+	for (i = 0; i < hashsize; i++) {
+		head = &cache->hashtable[i];
+		while (!hlist_empty(head)) {
+			cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
+			get_rpccred(cred);
+			if (!list_empty(&cred->cr_lru)) {
+				list_del(&cred->cr_lru);
+				number_cred_unused--;
+			}
+			list_add_tail(&cred->cr_lru, &free);
+			rpcauth_unhash_cred_locked(cred);
+		}
+	}
+	spin_unlock(&cache->lock);
+	spin_unlock(&rpc_credcache_lock);
+	rpcauth_destroy_credlist(&free);
+}
+
+/*
+ * Destroy the RPC credential cache
+ */
+void
+rpcauth_destroy_credcache(struct rpc_auth *auth)
+{
+	struct rpc_cred_cache *cache = auth->au_credcache;
+
+	if (cache) {
+		auth->au_credcache = NULL;
+		rpcauth_clear_credcache(cache);
+		kfree(cache->hashtable);
+		kfree(cache);
+	}
+}
+EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache);
+
+
+#define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ)
+
+/*
+ * Remove stale credentials. Avoid sleeping inside the loop.
+ */
+static long
+rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
+{
+	spinlock_t *cache_lock;
+	struct rpc_cred *cred, *next;
+	unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM;
+	long freed = 0;
+
+	list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) {
+
+		if (nr_to_scan-- == 0)
+			break;
+		/*
+		 * Enforce a 60 second garbage collection moratorium
+		 * Note that the cred_unused list must be time-ordered.
+		 */
+		if (time_in_range(cred->cr_expire, expired, jiffies) &&
+		    test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0)
+			break;
+
+		list_del_init(&cred->cr_lru);
+		number_cred_unused--;
+		freed++;
+		if (atomic_read(&cred->cr_count) != 0)
+			continue;
+
+		cache_lock = &cred->cr_auth->au_credcache->lock;
+		spin_lock(cache_lock);
+		if (atomic_read(&cred->cr_count) == 0) {
+			get_rpccred(cred);
+			list_add_tail(&cred->cr_lru, free);
+			rpcauth_unhash_cred_locked(cred);
+		}
+		spin_unlock(cache_lock);
+	}
+	return freed;
+}
+
+static unsigned long
+rpcauth_cache_do_shrink(int nr_to_scan)
+{
+	LIST_HEAD(free);
+	unsigned long freed;
+
+	spin_lock(&rpc_credcache_lock);
+	freed = rpcauth_prune_expired(&free, nr_to_scan);
+	spin_unlock(&rpc_credcache_lock);
+	rpcauth_destroy_credlist(&free);
+
+	return freed;
+}
+
+/*
+ * Run memory cache shrinker.
+ */
+static unsigned long
+rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
+
+{
+	if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL)
+		return SHRINK_STOP;
+
+	/* nothing left, don't come back */
+	if (list_empty(&cred_unused))
+		return SHRINK_STOP;
+
+	return rpcauth_cache_do_shrink(sc->nr_to_scan);
+}
+
+static unsigned long
+rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
+
+{
+	return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
+}
+
+static void
+rpcauth_cache_enforce_limit(void)
+{
+	unsigned long diff;
+	unsigned int nr_to_scan;
+
+	if (number_cred_unused <= auth_max_cred_cachesize)
+		return;
+	diff = number_cred_unused - auth_max_cred_cachesize;
+	nr_to_scan = 100;
+	if (diff < nr_to_scan)
+		nr_to_scan = diff;
+	rpcauth_cache_do_shrink(nr_to_scan);
+}
+
+/*
+ * Look up a process' credentials in the authentication cache
+ */
+struct rpc_cred *
+rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
+		int flags)
+{
+	LIST_HEAD(free);
+	struct rpc_cred_cache *cache = auth->au_credcache;
+	struct rpc_cred	*cred = NULL,
+			*entry, *new;
+	unsigned int nr;
+
+	nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits);
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) {
+		if (!entry->cr_ops->crmatch(acred, entry, flags))
+			continue;
+		if (flags & RPCAUTH_LOOKUP_RCU) {
+			if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) &&
+			    !test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags))
+				cred = entry;
+			break;
+		}
+		spin_lock(&cache->lock);
+		if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
+			spin_unlock(&cache->lock);
+			continue;
+		}
+		cred = get_rpccred(entry);
+		spin_unlock(&cache->lock);
+		break;
+	}
+	rcu_read_unlock();
+
+	if (cred != NULL)
+		goto found;
+
+	if (flags & RPCAUTH_LOOKUP_RCU)
+		return ERR_PTR(-ECHILD);
+
+	new = auth->au_ops->crcreate(auth, acred, flags);
+	if (IS_ERR(new)) {
+		cred = new;
+		goto out;
+	}
+
+	spin_lock(&cache->lock);
+	hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) {
+		if (!entry->cr_ops->crmatch(acred, entry, flags))
+			continue;
+		cred = get_rpccred(entry);
+		break;
+	}
+	if (cred == NULL) {
+		cred = new;
+		set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
+		hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
+	} else
+		list_add_tail(&new->cr_lru, &free);
+	spin_unlock(&cache->lock);
+	rpcauth_cache_enforce_limit();
+found:
+	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
+	    cred->cr_ops->cr_init != NULL &&
+	    !(flags & RPCAUTH_LOOKUP_NEW)) {
+		int res = cred->cr_ops->cr_init(auth, cred);
+		if (res < 0) {
+			put_rpccred(cred);
+			cred = ERR_PTR(res);
+		}
+	}
+	rpcauth_destroy_credlist(&free);
+out:
+	return cred;
+}
+EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache);
+
+struct rpc_cred *
+rpcauth_lookupcred(struct rpc_auth *auth, int flags)
+{
+	struct auth_cred acred;
+	struct rpc_cred *ret;
+	const struct cred *cred = current_cred();
+
+	dprintk("RPC:       looking up %s cred\n",
+		auth->au_ops->au_name);
+
+	memset(&acred, 0, sizeof(acred));
+	acred.uid = cred->fsuid;
+	acred.gid = cred->fsgid;
+	acred.group_info = cred->group_info;
+	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpcauth_lookupcred);
+
+void
+rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
+		  struct rpc_auth *auth, const struct rpc_credops *ops)
+{
+	INIT_HLIST_NODE(&cred->cr_hash);
+	INIT_LIST_HEAD(&cred->cr_lru);
+	atomic_set(&cred->cr_count, 1);
+	cred->cr_auth = auth;
+	cred->cr_ops = ops;
+	cred->cr_expire = jiffies;
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	cred->cr_magic = RPCAUTH_CRED_MAGIC;
+#endif
+	cred->cr_uid = acred->uid;
+}
+EXPORT_SYMBOL_GPL(rpcauth_init_cred);
+
+struct rpc_cred *
+rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags)
+{
+	dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
+			cred->cr_auth->au_ops->au_name, cred);
+	return get_rpccred(cred);
+}
+EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred);
+
+static struct rpc_cred *
+rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
+{
+	struct rpc_auth *auth = task->tk_client->cl_auth;
+	struct auth_cred acred = {
+		.uid = GLOBAL_ROOT_UID,
+		.gid = GLOBAL_ROOT_GID,
+	};
+
+	dprintk("RPC: %5u looking up %s cred\n",
+		task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
+	return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
+}
+
+static struct rpc_cred *
+rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags)
+{
+	struct rpc_auth *auth = task->tk_client->cl_auth;
+
+	dprintk("RPC: %5u looking up %s cred\n",
+		task->tk_pid, auth->au_ops->au_name);
+	return rpcauth_lookupcred(auth, lookupflags);
+}
+
+static int
+rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_cred *new;
+	int lookupflags = 0;
+
+	if (flags & RPC_TASK_ASYNC)
+		lookupflags |= RPCAUTH_LOOKUP_NEW;
+	if (cred != NULL)
+		new = cred->cr_ops->crbind(task, cred, lookupflags);
+	else if (flags & RPC_TASK_ROOTCREDS)
+		new = rpcauth_bind_root_cred(task, lookupflags);
+	else
+		new = rpcauth_bind_new_cred(task, lookupflags);
+	if (IS_ERR(new))
+		return PTR_ERR(new);
+	if (req->rq_cred != NULL)
+		put_rpccred(req->rq_cred);
+	req->rq_cred = new;
+	return 0;
+}
+
+void
+put_rpccred(struct rpc_cred *cred)
+{
+	/* Fast path for unhashed credentials */
+	if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
+		if (atomic_dec_and_test(&cred->cr_count))
+			cred->cr_ops->crdestroy(cred);
+		return;
+	}
+
+	if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
+		return;
+	if (!list_empty(&cred->cr_lru)) {
+		number_cred_unused--;
+		list_del_init(&cred->cr_lru);
+	}
+	if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
+		if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
+			cred->cr_expire = jiffies;
+			list_add_tail(&cred->cr_lru, &cred_unused);
+			number_cred_unused++;
+			goto out_nodestroy;
+		}
+		if (!rpcauth_unhash_cred(cred)) {
+			/* We were hashed and someone looked us up... */
+			goto out_nodestroy;
+		}
+	}
+	spin_unlock(&rpc_credcache_lock);
+	cred->cr_ops->crdestroy(cred);
+	return;
+out_nodestroy:
+	spin_unlock(&rpc_credcache_lock);
+}
+EXPORT_SYMBOL_GPL(put_rpccred);
+
+__be32 *
+rpcauth_marshcred(struct rpc_task *task, __be32 *p)
+{
+	struct rpc_cred	*cred = task->tk_rqstp->rq_cred;
+
+	dprintk("RPC: %5u marshaling %s cred %p\n",
+		task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+
+	return cred->cr_ops->crmarshal(task, p);
+}
+
+__be32 *
+rpcauth_checkverf(struct rpc_task *task, __be32 *p)
+{
+	struct rpc_cred	*cred = task->tk_rqstp->rq_cred;
+
+	dprintk("RPC: %5u validating %s cred %p\n",
+		task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+
+	return cred->cr_ops->crvalidate(task, p);
+}
+
+static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
+				   __be32 *data, void *obj)
+{
+	struct xdr_stream xdr;
+
+	xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
+	encode(rqstp, &xdr, obj);
+}
+
+int
+rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
+		__be32 *data, void *obj)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+	dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
+			task->tk_pid, cred->cr_ops->cr_name, cred);
+	if (cred->cr_ops->crwrap_req)
+		return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
+	/* By default, we encode the arguments normally. */
+	rpcauth_wrap_req_encode(encode, rqstp, data, obj);
+	return 0;
+}
+
+static int
+rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
+			  __be32 *data, void *obj)
+{
+	struct xdr_stream xdr;
+
+	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
+	return decode(rqstp, &xdr, obj);
+}
+
+int
+rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
+		__be32 *data, void *obj)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+	dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
+			task->tk_pid, cred->cr_ops->cr_name, cred);
+	if (cred->cr_ops->crunwrap_resp)
+		return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
+						   data, obj);
+	/* By default, we decode the arguments normally. */
+	return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
+}
+
+int
+rpcauth_refreshcred(struct rpc_task *task)
+{
+	struct rpc_cred	*cred;
+	int err;
+
+	cred = task->tk_rqstp->rq_cred;
+	if (cred == NULL) {
+		err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags);
+		if (err < 0)
+			goto out;
+		cred = task->tk_rqstp->rq_cred;
+	}
+	dprintk("RPC: %5u refreshing %s cred %p\n",
+		task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+
+	err = cred->cr_ops->crrefresh(task);
+out:
+	if (err < 0)
+		task->tk_status = err;
+	return err;
+}
+
+void
+rpcauth_invalcred(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+	dprintk("RPC: %5u invalidating %s cred %p\n",
+		task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+	if (cred)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+}
+
+int
+rpcauth_uptodatecred(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+
+	return cred == NULL ||
+		test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
+}
+
+static struct shrinker rpc_cred_shrinker = {
+	.count_objects = rpcauth_cache_shrink_count,
+	.scan_objects = rpcauth_cache_shrink_scan,
+	.seeks = DEFAULT_SEEKS,
+};
+
+int __init rpcauth_init_module(void)
+{
+	int err;
+
+	err = rpc_init_authunix();
+	if (err < 0)
+		goto out1;
+	err = rpc_init_generic_auth();
+	if (err < 0)
+		goto out2;
+	register_shrinker(&rpc_cred_shrinker);
+	return 0;
+out2:
+	rpc_destroy_authunix();
+out1:
+	return err;
+}
+
+void rpcauth_remove_module(void)
+{
+	rpc_destroy_authunix();
+	rpc_destroy_generic_auth();
+	unregister_shrinker(&rpc_cred_shrinker);
+}
diff --git a/kernel/net/sunrpc/auth_generic.c b/kernel/net/sunrpc/auth_generic.c
new file mode 100644
index 000000000..41248b182
--- /dev/null
+++ b/kernel/net/sunrpc/auth_generic.c
@@ -0,0 +1,290 @@
+/*
+ * Generic RPC credential
+ *
+ * Copyright (C) 2008, Trond Myklebust <Trond.Myklebust@netapp.com>
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/sched.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define RPC_MACHINE_CRED_USERID		GLOBAL_ROOT_UID
+#define RPC_MACHINE_CRED_GROUPID	GLOBAL_ROOT_GID
+
+struct generic_cred {
+	struct rpc_cred gc_base;
+	struct auth_cred acred;
+};
+
+static struct rpc_auth generic_auth;
+static const struct rpc_credops generic_credops;
+
+/*
+ * Public call interface
+ */
+struct rpc_cred *rpc_lookup_cred(void)
+{
+	return rpcauth_lookupcred(&generic_auth, 0);
+}
+EXPORT_SYMBOL_GPL(rpc_lookup_cred);
+
+struct rpc_cred *rpc_lookup_cred_nonblock(void)
+{
+	return rpcauth_lookupcred(&generic_auth, RPCAUTH_LOOKUP_RCU);
+}
+EXPORT_SYMBOL_GPL(rpc_lookup_cred_nonblock);
+
+/*
+ * Public call interface for looking up machine creds.
+ */
+struct rpc_cred *rpc_lookup_machine_cred(const char *service_name)
+{
+	struct auth_cred acred = {
+		.uid = RPC_MACHINE_CRED_USERID,
+		.gid = RPC_MACHINE_CRED_GROUPID,
+		.principal = service_name,
+		.machine_cred = 1,
+	};
+
+	dprintk("RPC:       looking up machine cred for service %s\n",
+			service_name);
+	return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
+}
+EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);
+
+static struct rpc_cred *generic_bind_cred(struct rpc_task *task,
+		struct rpc_cred *cred, int lookupflags)
+{
+	struct rpc_auth *auth = task->tk_client->cl_auth;
+	struct auth_cred *acred = &container_of(cred, struct generic_cred, gc_base)->acred;
+
+	return auth->au_ops->lookup_cred(auth, acred, lookupflags);
+}
+
+/*
+ * Lookup generic creds for current process
+ */
+static struct rpc_cred *
+generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	return rpcauth_lookup_credcache(&generic_auth, acred, flags);
+}
+
+static struct rpc_cred *
+generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	struct generic_cred *gcred;
+
+	gcred = kmalloc(sizeof(*gcred), GFP_KERNEL);
+	if (gcred == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops);
+	gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
+
+	gcred->acred.uid = acred->uid;
+	gcred->acred.gid = acred->gid;
+	gcred->acred.group_info = acred->group_info;
+	gcred->acred.ac_flags = 0;
+	if (gcred->acred.group_info != NULL)
+		get_group_info(gcred->acred.group_info);
+	gcred->acred.machine_cred = acred->machine_cred;
+	gcred->acred.principal = acred->principal;
+
+	dprintk("RPC:       allocated %s cred %p for uid %d gid %d\n",
+			gcred->acred.machine_cred ? "machine" : "generic",
+			gcred,
+			from_kuid(&init_user_ns, acred->uid),
+			from_kgid(&init_user_ns, acred->gid));
+	return &gcred->gc_base;
+}
+
+static void
+generic_free_cred(struct rpc_cred *cred)
+{
+	struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
+
+	dprintk("RPC:       generic_free_cred %p\n", gcred);
+	if (gcred->acred.group_info != NULL)
+		put_group_info(gcred->acred.group_info);
+	kfree(gcred);
+}
+
+static void
+generic_free_cred_callback(struct rcu_head *head)
+{
+	struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu);
+	generic_free_cred(cred);
+}
+
+static void
+generic_destroy_cred(struct rpc_cred *cred)
+{
+	call_rcu(&cred->cr_rcu, generic_free_cred_callback);
+}
+
+static int
+machine_cred_match(struct auth_cred *acred, struct generic_cred *gcred, int flags)
+{
+	if (!gcred->acred.machine_cred ||
+	    gcred->acred.principal != acred->principal ||
+	    !uid_eq(gcred->acred.uid, acred->uid) ||
+	    !gid_eq(gcred->acred.gid, acred->gid))
+		return 0;
+	return 1;
+}
+
+/*
+ * Match credentials against current process creds.
+ */
+static int
+generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
+{
+	struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
+	int i;
+
+	if (acred->machine_cred)
+		return machine_cred_match(acred, gcred, flags);
+
+	if (!uid_eq(gcred->acred.uid, acred->uid) ||
+	    !gid_eq(gcred->acred.gid, acred->gid) ||
+	    gcred->acred.machine_cred != 0)
+		goto out_nomatch;
+
+	/* Optimisation in the case where pointers are identical... */
+	if (gcred->acred.group_info == acred->group_info)
+		goto out_match;
+
+	/* Slow path... */
+	if (gcred->acred.group_info->ngroups != acred->group_info->ngroups)
+		goto out_nomatch;
+	for (i = 0; i < gcred->acred.group_info->ngroups; i++) {
+		if (!gid_eq(GROUP_AT(gcred->acred.group_info, i),
+				GROUP_AT(acred->group_info, i)))
+			goto out_nomatch;
+	}
+out_match:
+	return 1;
+out_nomatch:
+	return 0;
+}
+
+int __init rpc_init_generic_auth(void)
+{
+	return rpcauth_init_credcache(&generic_auth);
+}
+
+void rpc_destroy_generic_auth(void)
+{
+	rpcauth_destroy_credcache(&generic_auth);
+}
+
+/*
+ * Test the the current time (now) against the underlying credential key expiry
+ * minus a timeout and setup notification.
+ *
+ * The normal case:
+ * If 'now' is before the key expiry minus RPC_KEY_EXPIRE_TIMEO, set
+ * the RPC_CRED_NOTIFY_TIMEOUT flag to setup the underlying credential
+ * rpc_credops crmatch routine to notify this generic cred when it's key
+ * expiration is within RPC_KEY_EXPIRE_TIMEO, and return 0.
+ *
+ * The error case:
+ * If the underlying cred lookup fails, return -EACCES.
+ *
+ * The 'almost' error case:
+ * If 'now' is within key expiry minus RPC_KEY_EXPIRE_TIMEO, but not within
+ * key expiry minus RPC_KEY_EXPIRE_FAIL, set the RPC_CRED_EXPIRE_SOON bit
+ * on the acred ac_flags and return 0.
+ */
+static int
+generic_key_timeout(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+	struct auth_cred *acred = &container_of(cred, struct generic_cred,
+						gc_base)->acred;
+	struct rpc_cred *tcred;
+	int ret = 0;
+
+
+	/* Fast track for non crkey_timeout (no key) underlying credentials */
+	if (test_bit(RPC_CRED_NO_CRKEY_TIMEOUT, &acred->ac_flags))
+		return 0;
+
+	/* Fast track for the normal case */
+	if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags))
+		return 0;
+
+	/* lookup_cred either returns a valid referenced rpc_cred, or PTR_ERR */
+	tcred = auth->au_ops->lookup_cred(auth, acred, 0);
+	if (IS_ERR(tcred))
+		return -EACCES;
+
+	if (!tcred->cr_ops->crkey_timeout) {
+		set_bit(RPC_CRED_NO_CRKEY_TIMEOUT, &acred->ac_flags);
+		ret = 0;
+		goto out_put;
+	}
+
+	/* Test for the almost error case */
+	ret = tcred->cr_ops->crkey_timeout(tcred);
+	if (ret != 0) {
+		set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
+		ret = 0;
+	} else {
+		/* In case underlying cred key has been reset */
+		if (test_and_clear_bit(RPC_CRED_KEY_EXPIRE_SOON,
+					&acred->ac_flags))
+			dprintk("RPC:        UID %d Credential key reset\n",
+				from_kuid(&init_user_ns, tcred->cr_uid));
+		/* set up fasttrack for the normal case */
+		set_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
+	}
+
+out_put:
+	put_rpccred(tcred);
+	return ret;
+}
+
+static const struct rpc_authops generic_auth_ops = {
+	.owner = THIS_MODULE,
+	.au_name = "Generic",
+	.lookup_cred = generic_lookup_cred,
+	.crcreate = generic_create_cred,
+	.key_timeout = generic_key_timeout,
+};
+
+static struct rpc_auth generic_auth = {
+	.au_ops = &generic_auth_ops,
+	.au_count = ATOMIC_INIT(0),
+};
+
+static bool generic_key_to_expire(struct rpc_cred *cred)
+{
+	struct auth_cred *acred = &container_of(cred, struct generic_cred,
+						gc_base)->acred;
+	bool ret;
+
+	get_rpccred(cred);
+	ret = test_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
+	put_rpccred(cred);
+
+	return ret;
+}
+
+static const struct rpc_credops generic_credops = {
+	.cr_name = "Generic cred",
+	.crdestroy = generic_destroy_cred,
+	.crbind = generic_bind_cred,
+	.crmatch = generic_match,
+	.crkey_to_expire = generic_key_to_expire,
+};
diff --git a/kernel/net/sunrpc/auth_gss/Makefile b/kernel/net/sunrpc/auth_gss/Makefile
new file mode 100644
index 000000000..14e9e53e6
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/Makefile
@@ -0,0 +1,14 @@
+#
+# Makefile for Linux kernel rpcsec_gss implementation
+#
+
+obj-$(CONFIG_SUNRPC_GSS) += auth_rpcgss.o
+
+auth_rpcgss-y := auth_gss.o gss_generic_token.o \
+	gss_mech_switch.o svcauth_gss.o \
+	gss_rpc_upcall.o gss_rpc_xdr.o
+
+obj-$(CONFIG_RPCSEC_GSS_KRB5) += rpcsec_gss_krb5.o
+
+rpcsec_gss_krb5-y := gss_krb5_mech.o gss_krb5_seal.o gss_krb5_unseal.o \
+	gss_krb5_seqnum.o gss_krb5_wrap.o gss_krb5_crypto.o gss_krb5_keys.o
diff --git a/kernel/net/sunrpc/auth_gss/auth_gss.c b/kernel/net/sunrpc/auth_gss/auth_gss.c
new file mode 100644
index 000000000..dace13d76
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/auth_gss.c
@@ -0,0 +1,2097 @@
+/*
+ * linux/net/sunrpc/auth_gss/auth_gss.c
+ *
+ * RPCSEC_GSS client authentication.
+ *
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Dug Song       <dugsong@monkey.org>
+ *  Andy Adamson   <andros@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/gss_api.h>
+#include <asm/uaccess.h>
+#include <linux/hashtable.h>
+
+#include "../netns.h"
+
+static const struct rpc_authops authgss_ops;
+
+static const struct rpc_credops gss_credops;
+static const struct rpc_credops gss_nullops;
+
+#define GSS_RETRY_EXPIRED 5
+static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
+
+#define GSS_KEY_EXPIRE_TIMEO 240
+static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define GSS_CRED_SLACK		(RPC_MAX_AUTH_SIZE * 2)
+/* length of a krb5 verifier (48), plus data added before arguments when
+ * using integrity (two 4-byte integers): */
+#define GSS_VERF_SLACK		100
+
+static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
+static DEFINE_SPINLOCK(gss_auth_hash_lock);
+
+struct gss_pipe {
+	struct rpc_pipe_dir_object pdo;
+	struct rpc_pipe *pipe;
+	struct rpc_clnt *clnt;
+	const char *name;
+	struct kref kref;
+};
+
+struct gss_auth {
+	struct kref kref;
+	struct hlist_node hash;
+	struct rpc_auth rpc_auth;
+	struct gss_api_mech *mech;
+	enum rpc_gss_svc service;
+	struct rpc_clnt *client;
+	struct net *net;
+	/*
+	 * There are two upcall pipes; dentry[1], named "gssd", is used
+	 * for the new text-based upcall; dentry[0] is named after the
+	 * mechanism (for example, "krb5") and exists for
+	 * backwards-compatibility with older gssd's.
+	 */
+	struct gss_pipe *gss_pipe[2];
+	const char *target_name;
+};
+
+/* pipe_version >= 0 if and only if someone has a pipe open. */
+static DEFINE_SPINLOCK(pipe_version_lock);
+static struct rpc_wait_queue pipe_version_rpc_waitqueue;
+static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
+static void gss_put_auth(struct gss_auth *gss_auth);
+
+static void gss_free_ctx(struct gss_cl_ctx *);
+static const struct rpc_pipe_ops gss_upcall_ops_v0;
+static const struct rpc_pipe_ops gss_upcall_ops_v1;
+
+static inline struct gss_cl_ctx *
+gss_get_ctx(struct gss_cl_ctx *ctx)
+{
+	atomic_inc(&ctx->count);
+	return ctx;
+}
+
+static inline void
+gss_put_ctx(struct gss_cl_ctx *ctx)
+{
+	if (atomic_dec_and_test(&ctx->count))
+		gss_free_ctx(ctx);
+}
+
+/* gss_cred_set_ctx:
+ * called by gss_upcall_callback and gss_create_upcall in order
+ * to set the gss context. The actual exchange of an old context
+ * and a new one is protected by the pipe->lock.
+ */
+static void
+gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+
+	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+		return;
+	gss_get_ctx(ctx);
+	rcu_assign_pointer(gss_cred->gc_ctx, ctx);
+	set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	smp_mb__before_atomic();
+	clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
+}
+
+static const void *
+simple_get_bytes(const void *p, const void *end, void *res, size_t len)
+{
+	const void *q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	memcpy(res, p, len);
+	return q;
+}
+
+static inline const void *
+simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
+{
+	const void *q;
+	unsigned int len;
+
+	p = simple_get_bytes(p, end, &len, sizeof(len));
+	if (IS_ERR(p))
+		return p;
+	q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	dest->data = kmemdup(p, len, GFP_NOFS);
+	if (unlikely(dest->data == NULL))
+		return ERR_PTR(-ENOMEM);
+	dest->len = len;
+	return q;
+}
+
+static struct gss_cl_ctx *
+gss_cred_get_ctx(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx = NULL;
+
+	rcu_read_lock();
+	ctx = rcu_dereference(gss_cred->gc_ctx);
+	if (ctx)
+		gss_get_ctx(ctx);
+	rcu_read_unlock();
+	return ctx;
+}
+
+static struct gss_cl_ctx *
+gss_alloc_context(void)
+{
+	struct gss_cl_ctx *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
+	if (ctx != NULL) {
+		ctx->gc_proc = RPC_GSS_PROC_DATA;
+		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
+		spin_lock_init(&ctx->gc_seq_lock);
+		atomic_set(&ctx->count,1);
+	}
+	return ctx;
+}
+
+#define GSSD_MIN_TIMEOUT (60 * 60)
+static const void *
+gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
+{
+	const void *q;
+	unsigned int seclen;
+	unsigned int timeout;
+	unsigned long now = jiffies;
+	u32 window_size;
+	int ret;
+
+	/* First unsigned int gives the remaining lifetime in seconds of the
+	 * credential - e.g. the remaining TGT lifetime for Kerberos or
+	 * the -t value passed to GSSD.
+	 */
+	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
+	if (IS_ERR(p))
+		goto err;
+	if (timeout == 0)
+		timeout = GSSD_MIN_TIMEOUT;
+	ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
+	/* Sequence number window. Determines the maximum number of
+	 * simultaneous requests
+	 */
+	p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
+	if (IS_ERR(p))
+		goto err;
+	ctx->gc_win = window_size;
+	/* gssd signals an error by passing ctx->gc_win = 0: */
+	if (ctx->gc_win == 0) {
+		/*
+		 * in which case, p points to an error code. Anything other
+		 * than -EKEYEXPIRED gets converted to -EACCES.
+		 */
+		p = simple_get_bytes(p, end, &ret, sizeof(ret));
+		if (!IS_ERR(p))
+			p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
+						    ERR_PTR(-EACCES);
+		goto err;
+	}
+	/* copy the opaque wire context */
+	p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
+	if (IS_ERR(p))
+		goto err;
+	/* import the opaque security context */
+	p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
+	if (IS_ERR(p))
+		goto err;
+	q = (const void *)((const char *)p + seclen);
+	if (unlikely(q > end || q < p)) {
+		p = ERR_PTR(-EFAULT);
+		goto err;
+	}
+	ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
+	if (ret < 0) {
+		p = ERR_PTR(ret);
+		goto err;
+	}
+
+	/* is there any trailing data? */
+	if (q == end) {
+		p = q;
+		goto done;
+	}
+
+	/* pull in acceptor name (if there is one) */
+	p = simple_get_netobj(q, end, &ctx->gc_acceptor);
+	if (IS_ERR(p))
+		goto err;
+done:
+	dprintk("RPC:       %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n",
+		__func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len,
+		ctx->gc_acceptor.data);
+	return p;
+err:
+	dprintk("RPC:       %s returns error %ld\n", __func__, -PTR_ERR(p));
+	return p;
+}
+
+#define UPCALL_BUF_LEN 128
+
+struct gss_upcall_msg {
+	atomic_t count;
+	kuid_t	uid;
+	struct rpc_pipe_msg msg;
+	struct list_head list;
+	struct gss_auth *auth;
+	struct rpc_pipe *pipe;
+	struct rpc_wait_queue rpc_waitqueue;
+	wait_queue_head_t waitqueue;
+	struct gss_cl_ctx *ctx;
+	char databuf[UPCALL_BUF_LEN];
+};
+
+static int get_pipe_version(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	int ret;
+
+	spin_lock(&pipe_version_lock);
+	if (sn->pipe_version >= 0) {
+		atomic_inc(&sn->pipe_users);
+		ret = sn->pipe_version;
+	} else
+		ret = -EAGAIN;
+	spin_unlock(&pipe_version_lock);
+	return ret;
+}
+
+static void put_pipe_version(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
+		sn->pipe_version = -1;
+		spin_unlock(&pipe_version_lock);
+	}
+}
+
+static void
+gss_release_msg(struct gss_upcall_msg *gss_msg)
+{
+	struct net *net = gss_msg->auth->net;
+	if (!atomic_dec_and_test(&gss_msg->count))
+		return;
+	put_pipe_version(net);
+	BUG_ON(!list_empty(&gss_msg->list));
+	if (gss_msg->ctx != NULL)
+		gss_put_ctx(gss_msg->ctx);
+	rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
+	gss_put_auth(gss_msg->auth);
+	kfree(gss_msg);
+}
+
+static struct gss_upcall_msg *
+__gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid)
+{
+	struct gss_upcall_msg *pos;
+	list_for_each_entry(pos, &pipe->in_downcall, list) {
+		if (!uid_eq(pos->uid, uid))
+			continue;
+		atomic_inc(&pos->count);
+		dprintk("RPC:       %s found msg %p\n", __func__, pos);
+		return pos;
+	}
+	dprintk("RPC:       %s found nothing\n", __func__);
+	return NULL;
+}
+
+/* Try to add an upcall to the pipefs queue.
+ * If an upcall owned by our uid already exists, then we return a reference
+ * to that upcall instead of adding the new upcall.
+ */
+static inline struct gss_upcall_msg *
+gss_add_msg(struct gss_upcall_msg *gss_msg)
+{
+	struct rpc_pipe *pipe = gss_msg->pipe;
+	struct gss_upcall_msg *old;
+
+	spin_lock(&pipe->lock);
+	old = __gss_find_upcall(pipe, gss_msg->uid);
+	if (old == NULL) {
+		atomic_inc(&gss_msg->count);
+		list_add(&gss_msg->list, &pipe->in_downcall);
+	} else
+		gss_msg = old;
+	spin_unlock(&pipe->lock);
+	return gss_msg;
+}
+
+static void
+__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	list_del_init(&gss_msg->list);
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+	wake_up_all(&gss_msg->waitqueue);
+	atomic_dec(&gss_msg->count);
+}
+
+static void
+gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	struct rpc_pipe *pipe = gss_msg->pipe;
+
+	if (list_empty(&gss_msg->list))
+		return;
+	spin_lock(&pipe->lock);
+	if (!list_empty(&gss_msg->list))
+		__gss_unhash_msg(gss_msg);
+	spin_unlock(&pipe->lock);
+}
+
+static void
+gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
+{
+	switch (gss_msg->msg.errno) {
+	case 0:
+		if (gss_msg->ctx == NULL)
+			break;
+		clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
+		gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
+		break;
+	case -EKEYEXPIRED:
+		set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
+	}
+	gss_cred->gc_upcall_timestamp = jiffies;
+	gss_cred->gc_upcall = NULL;
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+}
+
+static void
+gss_upcall_callback(struct rpc_task *task)
+{
+	struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
+	struct rpc_pipe *pipe = gss_msg->pipe;
+
+	spin_lock(&pipe->lock);
+	gss_handle_downcall_result(gss_cred, gss_msg);
+	spin_unlock(&pipe->lock);
+	task->tk_status = gss_msg->msg.errno;
+	gss_release_msg(gss_msg);
+}
+
+static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
+{
+	uid_t uid = from_kuid(&init_user_ns, gss_msg->uid);
+	memcpy(gss_msg->databuf, &uid, sizeof(uid));
+	gss_msg->msg.data = gss_msg->databuf;
+	gss_msg->msg.len = sizeof(uid);
+
+	BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
+}
+
+static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
+				const char *service_name,
+				const char *target_name)
+{
+	struct gss_api_mech *mech = gss_msg->auth->mech;
+	char *p = gss_msg->databuf;
+	size_t buflen = sizeof(gss_msg->databuf);
+	int len;
+
+	len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
+			from_kuid(&init_user_ns, gss_msg->uid));
+	buflen -= len;
+	p += len;
+	gss_msg->msg.len = len;
+	if (target_name) {
+		len = scnprintf(p, buflen, "target=%s ", target_name);
+		buflen -= len;
+		p += len;
+		gss_msg->msg.len += len;
+	}
+	if (service_name != NULL) {
+		len = scnprintf(p, buflen, "service=%s ", service_name);
+		buflen -= len;
+		p += len;
+		gss_msg->msg.len += len;
+	}
+	if (mech->gm_upcall_enctypes) {
+		len = scnprintf(p, buflen, "enctypes=%s ",
+				mech->gm_upcall_enctypes);
+		buflen -= len;
+		p += len;
+		gss_msg->msg.len += len;
+	}
+	len = scnprintf(p, buflen, "\n");
+	if (len == 0)
+		goto out_overflow;
+	gss_msg->msg.len += len;
+
+	gss_msg->msg.data = gss_msg->databuf;
+	return 0;
+out_overflow:
+	WARN_ON_ONCE(1);
+	return -ENOMEM;
+}
+
+static struct gss_upcall_msg *
+gss_alloc_msg(struct gss_auth *gss_auth,
+		kuid_t uid, const char *service_name)
+{
+	struct gss_upcall_msg *gss_msg;
+	int vers;
+	int err = -ENOMEM;
+
+	gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
+	if (gss_msg == NULL)
+		goto err;
+	vers = get_pipe_version(gss_auth->net);
+	err = vers;
+	if (err < 0)
+		goto err_free_msg;
+	gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
+	INIT_LIST_HEAD(&gss_msg->list);
+	rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
+	init_waitqueue_head(&gss_msg->waitqueue);
+	atomic_set(&gss_msg->count, 1);
+	gss_msg->uid = uid;
+	gss_msg->auth = gss_auth;
+	switch (vers) {
+	case 0:
+		gss_encode_v0_msg(gss_msg);
+		break;
+	default:
+		err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
+		if (err)
+			goto err_put_pipe_version;
+	};
+	kref_get(&gss_auth->kref);
+	return gss_msg;
+err_put_pipe_version:
+	put_pipe_version(gss_auth->net);
+err_free_msg:
+	kfree(gss_msg);
+err:
+	return ERR_PTR(err);
+}
+
+static struct gss_upcall_msg *
+gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_new, *gss_msg;
+	kuid_t uid = cred->cr_uid;
+
+	gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
+	if (IS_ERR(gss_new))
+		return gss_new;
+	gss_msg = gss_add_msg(gss_new);
+	if (gss_msg == gss_new) {
+		int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
+		if (res) {
+			gss_unhash_msg(gss_new);
+			gss_msg = ERR_PTR(res);
+		}
+	} else
+		gss_release_msg(gss_new);
+	return gss_msg;
+}
+
+static void warn_gssd(void)
+{
+	dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
+}
+
+static inline int
+gss_refresh_upcall(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+	struct gss_auth *gss_auth = container_of(cred->cr_auth,
+			struct gss_auth, rpc_auth);
+	struct gss_cred *gss_cred = container_of(cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg;
+	struct rpc_pipe *pipe;
+	int err = 0;
+
+	dprintk("RPC: %5u %s for uid %u\n",
+		task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
+	gss_msg = gss_setup_upcall(gss_auth, cred);
+	if (PTR_ERR(gss_msg) == -EAGAIN) {
+		/* XXX: warning on the first, under the assumption we
+		 * shouldn't normally hit this case on a refresh. */
+		warn_gssd();
+		task->tk_timeout = 15*HZ;
+		rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
+		return -EAGAIN;
+	}
+	if (IS_ERR(gss_msg)) {
+		err = PTR_ERR(gss_msg);
+		goto out;
+	}
+	pipe = gss_msg->pipe;
+	spin_lock(&pipe->lock);
+	if (gss_cred->gc_upcall != NULL)
+		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
+	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+		task->tk_timeout = 0;
+		gss_cred->gc_upcall = gss_msg;
+		/* gss_upcall_callback will release the reference to gss_upcall_msg */
+		atomic_inc(&gss_msg->count);
+		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
+	} else {
+		gss_handle_downcall_result(gss_cred, gss_msg);
+		err = gss_msg->msg.errno;
+	}
+	spin_unlock(&pipe->lock);
+	gss_release_msg(gss_msg);
+out:
+	dprintk("RPC: %5u %s for uid %u result %d\n",
+		task->tk_pid, __func__,
+		from_kuid(&init_user_ns, cred->cr_uid),	err);
+	return err;
+}
+
+static inline int
+gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
+{
+	struct net *net = gss_auth->net;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_pipe *pipe;
+	struct rpc_cred *cred = &gss_cred->gc_base;
+	struct gss_upcall_msg *gss_msg;
+	DEFINE_WAIT(wait);
+	int err;
+
+	dprintk("RPC:       %s for uid %u\n",
+		__func__, from_kuid(&init_user_ns, cred->cr_uid));
+retry:
+	err = 0;
+	/* if gssd is down, just skip upcalling altogether */
+	if (!gssd_running(net)) {
+		warn_gssd();
+		return -EACCES;
+	}
+	gss_msg = gss_setup_upcall(gss_auth, cred);
+	if (PTR_ERR(gss_msg) == -EAGAIN) {
+		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
+				sn->pipe_version >= 0, 15 * HZ);
+		if (sn->pipe_version < 0) {
+			warn_gssd();
+			err = -EACCES;
+		}
+		if (err < 0)
+			goto out;
+		goto retry;
+	}
+	if (IS_ERR(gss_msg)) {
+		err = PTR_ERR(gss_msg);
+		goto out;
+	}
+	pipe = gss_msg->pipe;
+	for (;;) {
+		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
+		spin_lock(&pipe->lock);
+		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
+			break;
+		}
+		spin_unlock(&pipe->lock);
+		if (fatal_signal_pending(current)) {
+			err = -ERESTARTSYS;
+			goto out_intr;
+		}
+		schedule();
+	}
+	if (gss_msg->ctx)
+		gss_cred_set_ctx(cred, gss_msg->ctx);
+	else
+		err = gss_msg->msg.errno;
+	spin_unlock(&pipe->lock);
+out_intr:
+	finish_wait(&gss_msg->waitqueue, &wait);
+	gss_release_msg(gss_msg);
+out:
+	dprintk("RPC:       %s for uid %u result %d\n",
+		__func__, from_kuid(&init_user_ns, cred->cr_uid), err);
+	return err;
+}
+
+#define MSG_BUF_MAXSIZE 1024
+
+static ssize_t
+gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
+{
+	const void *p, *end;
+	void *buf;
+	struct gss_upcall_msg *gss_msg;
+	struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
+	struct gss_cl_ctx *ctx;
+	uid_t id;
+	kuid_t uid;
+	ssize_t err = -EFBIG;
+
+	if (mlen > MSG_BUF_MAXSIZE)
+		goto out;
+	err = -ENOMEM;
+	buf = kmalloc(mlen, GFP_NOFS);
+	if (!buf)
+		goto out;
+
+	err = -EFAULT;
+	if (copy_from_user(buf, src, mlen))
+		goto err;
+
+	end = (const void *)((char *)buf + mlen);
+	p = simple_get_bytes(buf, end, &id, sizeof(id));
+	if (IS_ERR(p)) {
+		err = PTR_ERR(p);
+		goto err;
+	}
+
+	uid = make_kuid(&init_user_ns, id);
+	if (!uid_valid(uid)) {
+		err = -EINVAL;
+		goto err;
+	}
+
+	err = -ENOMEM;
+	ctx = gss_alloc_context();
+	if (ctx == NULL)
+		goto err;
+
+	err = -ENOENT;
+	/* Find a matching upcall */
+	spin_lock(&pipe->lock);
+	gss_msg = __gss_find_upcall(pipe, uid);
+	if (gss_msg == NULL) {
+		spin_unlock(&pipe->lock);
+		goto err_put_ctx;
+	}
+	list_del_init(&gss_msg->list);
+	spin_unlock(&pipe->lock);
+
+	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
+	if (IS_ERR(p)) {
+		err = PTR_ERR(p);
+		switch (err) {
+		case -EACCES:
+		case -EKEYEXPIRED:
+			gss_msg->msg.errno = err;
+			err = mlen;
+			break;
+		case -EFAULT:
+		case -ENOMEM:
+		case -EINVAL:
+		case -ENOSYS:
+			gss_msg->msg.errno = -EAGAIN;
+			break;
+		default:
+			printk(KERN_CRIT "%s: bad return from "
+				"gss_fill_context: %zd\n", __func__, err);
+			BUG();
+		}
+		goto err_release_msg;
+	}
+	gss_msg->ctx = gss_get_ctx(ctx);
+	err = mlen;
+
+err_release_msg:
+	spin_lock(&pipe->lock);
+	__gss_unhash_msg(gss_msg);
+	spin_unlock(&pipe->lock);
+	gss_release_msg(gss_msg);
+err_put_ctx:
+	gss_put_ctx(ctx);
+err:
+	kfree(buf);
+out:
+	dprintk("RPC:       %s returning %Zd\n", __func__, err);
+	return err;
+}
+
+static int gss_pipe_open(struct inode *inode, int new_version)
+{
+	struct net *net = inode->i_sb->s_fs_info;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	int ret = 0;
+
+	spin_lock(&pipe_version_lock);
+	if (sn->pipe_version < 0) {
+		/* First open of any gss pipe determines the version: */
+		sn->pipe_version = new_version;
+		rpc_wake_up(&pipe_version_rpc_waitqueue);
+		wake_up(&pipe_version_waitqueue);
+	} else if (sn->pipe_version != new_version) {
+		/* Trying to open a pipe of a different version */
+		ret = -EBUSY;
+		goto out;
+	}
+	atomic_inc(&sn->pipe_users);
+out:
+	spin_unlock(&pipe_version_lock);
+	return ret;
+
+}
+
+static int gss_pipe_open_v0(struct inode *inode)
+{
+	return gss_pipe_open(inode, 0);
+}
+
+static int gss_pipe_open_v1(struct inode *inode)
+{
+	return gss_pipe_open(inode, 1);
+}
+
+static void
+gss_pipe_release(struct inode *inode)
+{
+	struct net *net = inode->i_sb->s_fs_info;
+	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	struct gss_upcall_msg *gss_msg;
+
+restart:
+	spin_lock(&pipe->lock);
+	list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
+
+		if (!list_empty(&gss_msg->msg.list))
+			continue;
+		gss_msg->msg.errno = -EPIPE;
+		atomic_inc(&gss_msg->count);
+		__gss_unhash_msg(gss_msg);
+		spin_unlock(&pipe->lock);
+		gss_release_msg(gss_msg);
+		goto restart;
+	}
+	spin_unlock(&pipe->lock);
+
+	put_pipe_version(net);
+}
+
+static void
+gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+	struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
+
+	if (msg->errno < 0) {
+		dprintk("RPC:       %s releasing msg %p\n",
+			__func__, gss_msg);
+		atomic_inc(&gss_msg->count);
+		gss_unhash_msg(gss_msg);
+		if (msg->errno == -ETIMEDOUT)
+			warn_gssd();
+		gss_release_msg(gss_msg);
+	}
+}
+
+static void gss_pipe_dentry_destroy(struct dentry *dir,
+		struct rpc_pipe_dir_object *pdo)
+{
+	struct gss_pipe *gss_pipe = pdo->pdo_data;
+	struct rpc_pipe *pipe = gss_pipe->pipe;
+
+	if (pipe->dentry != NULL) {
+		rpc_unlink(pipe->dentry);
+		pipe->dentry = NULL;
+	}
+}
+
+static int gss_pipe_dentry_create(struct dentry *dir,
+		struct rpc_pipe_dir_object *pdo)
+{
+	struct gss_pipe *p = pdo->pdo_data;
+	struct dentry *dentry;
+
+	dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+	p->pipe->dentry = dentry;
+	return 0;
+}
+
+static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
+	.create = gss_pipe_dentry_create,
+	.destroy = gss_pipe_dentry_destroy,
+};
+
+static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
+		const char *name,
+		const struct rpc_pipe_ops *upcall_ops)
+{
+	struct gss_pipe *p;
+	int err = -ENOMEM;
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (p == NULL)
+		goto err;
+	p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
+	if (IS_ERR(p->pipe)) {
+		err = PTR_ERR(p->pipe);
+		goto err_free_gss_pipe;
+	}
+	p->name = name;
+	p->clnt = clnt;
+	kref_init(&p->kref);
+	rpc_init_pipe_dir_object(&p->pdo,
+			&gss_pipe_dir_object_ops,
+			p);
+	return p;
+err_free_gss_pipe:
+	kfree(p);
+err:
+	return ERR_PTR(err);
+}
+
+struct gss_alloc_pdo {
+	struct rpc_clnt *clnt;
+	const char *name;
+	const struct rpc_pipe_ops *upcall_ops;
+};
+
+static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
+{
+	struct gss_pipe *gss_pipe;
+	struct gss_alloc_pdo *args = data;
+
+	if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
+		return 0;
+	gss_pipe = container_of(pdo, struct gss_pipe, pdo);
+	if (strcmp(gss_pipe->name, args->name) != 0)
+		return 0;
+	if (!kref_get_unless_zero(&gss_pipe->kref))
+		return 0;
+	return 1;
+}
+
+static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
+{
+	struct gss_pipe *gss_pipe;
+	struct gss_alloc_pdo *args = data;
+
+	gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
+	if (!IS_ERR(gss_pipe))
+		return &gss_pipe->pdo;
+	return NULL;
+}
+
+static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
+		const char *name,
+		const struct rpc_pipe_ops *upcall_ops)
+{
+	struct net *net = rpc_net_ns(clnt);
+	struct rpc_pipe_dir_object *pdo;
+	struct gss_alloc_pdo args = {
+		.clnt = clnt,
+		.name = name,
+		.upcall_ops = upcall_ops,
+	};
+
+	pdo = rpc_find_or_alloc_pipe_dir_object(net,
+			&clnt->cl_pipedir_objects,
+			gss_pipe_match_pdo,
+			gss_pipe_alloc_pdo,
+			&args);
+	if (pdo != NULL)
+		return container_of(pdo, struct gss_pipe, pdo);
+	return ERR_PTR(-ENOMEM);
+}
+
+static void __gss_pipe_free(struct gss_pipe *p)
+{
+	struct rpc_clnt *clnt = p->clnt;
+	struct net *net = rpc_net_ns(clnt);
+
+	rpc_remove_pipe_dir_object(net,
+			&clnt->cl_pipedir_objects,
+			&p->pdo);
+	rpc_destroy_pipe_data(p->pipe);
+	kfree(p);
+}
+
+static void __gss_pipe_release(struct kref *kref)
+{
+	struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
+
+	__gss_pipe_free(p);
+}
+
+static void gss_pipe_free(struct gss_pipe *p)
+{
+	if (p != NULL)
+		kref_put(&p->kref, __gss_pipe_release);
+}
+
+/*
+ * NOTE: we have the opportunity to use different
+ * parameters based on the input flavor (which must be a pseudoflavor)
+ */
+static struct gss_auth *
+gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	rpc_authflavor_t flavor = args->pseudoflavor;
+	struct gss_auth *gss_auth;
+	struct gss_pipe *gss_pipe;
+	struct rpc_auth * auth;
+	int err = -ENOMEM; /* XXX? */
+
+	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
+
+	if (!try_module_get(THIS_MODULE))
+		return ERR_PTR(err);
+	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
+		goto out_dec;
+	INIT_HLIST_NODE(&gss_auth->hash);
+	gss_auth->target_name = NULL;
+	if (args->target_name) {
+		gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
+		if (gss_auth->target_name == NULL)
+			goto err_free;
+	}
+	gss_auth->client = clnt;
+	gss_auth->net = get_net(rpc_net_ns(clnt));
+	err = -EINVAL;
+	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
+	if (!gss_auth->mech) {
+		dprintk("RPC:       Pseudoflavor %d not found!\n", flavor);
+		goto err_put_net;
+	}
+	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
+	if (gss_auth->service == 0)
+		goto err_put_mech;
+	if (!gssd_running(gss_auth->net))
+		goto err_put_mech;
+	auth = &gss_auth->rpc_auth;
+	auth->au_cslack = GSS_CRED_SLACK >> 2;
+	auth->au_rslack = GSS_VERF_SLACK >> 2;
+	auth->au_ops = &authgss_ops;
+	auth->au_flavor = flavor;
+	atomic_set(&auth->au_count, 1);
+	kref_init(&gss_auth->kref);
+
+	err = rpcauth_init_credcache(auth);
+	if (err)
+		goto err_put_mech;
+	/*
+	 * Note: if we created the old pipe first, then someone who
+	 * examined the directory at the right moment might conclude
+	 * that we supported only the old pipe.  So we instead create
+	 * the new pipe first.
+	 */
+	gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
+	if (IS_ERR(gss_pipe)) {
+		err = PTR_ERR(gss_pipe);
+		goto err_destroy_credcache;
+	}
+	gss_auth->gss_pipe[1] = gss_pipe;
+
+	gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
+			&gss_upcall_ops_v0);
+	if (IS_ERR(gss_pipe)) {
+		err = PTR_ERR(gss_pipe);
+		goto err_destroy_pipe_1;
+	}
+	gss_auth->gss_pipe[0] = gss_pipe;
+
+	return gss_auth;
+err_destroy_pipe_1:
+	gss_pipe_free(gss_auth->gss_pipe[1]);
+err_destroy_credcache:
+	rpcauth_destroy_credcache(auth);
+err_put_mech:
+	gss_mech_put(gss_auth->mech);
+err_put_net:
+	put_net(gss_auth->net);
+err_free:
+	kfree(gss_auth->target_name);
+	kfree(gss_auth);
+out_dec:
+	module_put(THIS_MODULE);
+	return ERR_PTR(err);
+}
+
+static void
+gss_free(struct gss_auth *gss_auth)
+{
+	gss_pipe_free(gss_auth->gss_pipe[0]);
+	gss_pipe_free(gss_auth->gss_pipe[1]);
+	gss_mech_put(gss_auth->mech);
+	put_net(gss_auth->net);
+	kfree(gss_auth->target_name);
+
+	kfree(gss_auth);
+	module_put(THIS_MODULE);
+}
+
+static void
+gss_free_callback(struct kref *kref)
+{
+	struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
+
+	gss_free(gss_auth);
+}
+
+static void
+gss_put_auth(struct gss_auth *gss_auth)
+{
+	kref_put(&gss_auth->kref, gss_free_callback);
+}
+
+static void
+gss_destroy(struct rpc_auth *auth)
+{
+	struct gss_auth *gss_auth = container_of(auth,
+			struct gss_auth, rpc_auth);
+
+	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
+			auth, auth->au_flavor);
+
+	if (hash_hashed(&gss_auth->hash)) {
+		spin_lock(&gss_auth_hash_lock);
+		hash_del(&gss_auth->hash);
+		spin_unlock(&gss_auth_hash_lock);
+	}
+
+	gss_pipe_free(gss_auth->gss_pipe[0]);
+	gss_auth->gss_pipe[0] = NULL;
+	gss_pipe_free(gss_auth->gss_pipe[1]);
+	gss_auth->gss_pipe[1] = NULL;
+	rpcauth_destroy_credcache(auth);
+
+	gss_put_auth(gss_auth);
+}
+
+/*
+ * Auths may be shared between rpc clients that were cloned from a
+ * common client with the same xprt, if they also share the flavor and
+ * target_name.
+ *
+ * The auth is looked up from the oldest parent sharing the same
+ * cl_xprt, and the auth itself references only that common parent
+ * (which is guaranteed to last as long as any of its descendants).
+ */
+static struct gss_auth *
+gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args,
+		struct rpc_clnt *clnt,
+		struct gss_auth *new)
+{
+	struct gss_auth *gss_auth;
+	unsigned long hashval = (unsigned long)clnt;
+
+	spin_lock(&gss_auth_hash_lock);
+	hash_for_each_possible(gss_auth_hash_table,
+			gss_auth,
+			hash,
+			hashval) {
+		if (gss_auth->client != clnt)
+			continue;
+		if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
+			continue;
+		if (gss_auth->target_name != args->target_name) {
+			if (gss_auth->target_name == NULL)
+				continue;
+			if (args->target_name == NULL)
+				continue;
+			if (strcmp(gss_auth->target_name, args->target_name))
+				continue;
+		}
+		if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
+			continue;
+		goto out;
+	}
+	if (new)
+		hash_add(gss_auth_hash_table, &new->hash, hashval);
+	gss_auth = new;
+out:
+	spin_unlock(&gss_auth_hash_lock);
+	return gss_auth;
+}
+
+static struct gss_auth *
+gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	struct gss_auth *gss_auth;
+	struct gss_auth *new;
+
+	gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
+	if (gss_auth != NULL)
+		goto out;
+	new = gss_create_new(args, clnt);
+	if (IS_ERR(new))
+		return new;
+	gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
+	if (gss_auth != new)
+		gss_destroy(&new->rpc_auth);
+out:
+	return gss_auth;
+}
+
+static struct rpc_auth *
+gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	struct gss_auth *gss_auth;
+	struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt);
+
+	while (clnt != clnt->cl_parent) {
+		struct rpc_clnt *parent = clnt->cl_parent;
+		/* Find the original parent for this transport */
+		if (rcu_access_pointer(parent->cl_xprt) != xprt)
+			break;
+		clnt = parent;
+	}
+
+	gss_auth = gss_create_hashed(args, clnt);
+	if (IS_ERR(gss_auth))
+		return ERR_CAST(gss_auth);
+	return &gss_auth->rpc_auth;
+}
+
+/*
+ * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
+ * to the server with the GSS control procedure field set to
+ * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
+ * all RPCSEC_GSS state associated with that context.
+ */
+static int
+gss_destroying_context(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
+	struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
+	struct rpc_task *task;
+
+	if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
+		return 0;
+
+	ctx->gc_proc = RPC_GSS_PROC_DESTROY;
+	cred->cr_ops = &gss_nullops;
+
+	/* Take a reference to ensure the cred will be destroyed either
+	 * by the RPC call or by the put_rpccred() below */
+	get_rpccred(cred);
+
+	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
+	if (!IS_ERR(task))
+		rpc_put_task(task);
+
+	put_rpccred(cred);
+	return 1;
+}
+
+/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
+ * to create a new cred or context, so they check that things have been
+ * allocated before freeing them. */
+static void
+gss_do_free_ctx(struct gss_cl_ctx *ctx)
+{
+	dprintk("RPC:       %s\n", __func__);
+
+	gss_delete_sec_context(&ctx->gc_gss_ctx);
+	kfree(ctx->gc_wire_ctx.data);
+	kfree(ctx->gc_acceptor.data);
+	kfree(ctx);
+}
+
+static void
+gss_free_ctx_callback(struct rcu_head *head)
+{
+	struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
+	gss_do_free_ctx(ctx);
+}
+
+static void
+gss_free_ctx(struct gss_cl_ctx *ctx)
+{
+	call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
+}
+
+static void
+gss_free_cred(struct gss_cred *gss_cred)
+{
+	dprintk("RPC:       %s cred=%p\n", __func__, gss_cred);
+	kfree(gss_cred);
+}
+
+static void
+gss_free_cred_callback(struct rcu_head *head)
+{
+	struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
+	gss_free_cred(gss_cred);
+}
+
+static void
+gss_destroy_nullcred(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
+	struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
+
+	RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
+	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
+	if (ctx)
+		gss_put_ctx(ctx);
+	gss_put_auth(gss_auth);
+}
+
+static void
+gss_destroy_cred(struct rpc_cred *cred)
+{
+
+	if (gss_destroying_context(cred))
+		return;
+	gss_destroy_nullcred(cred);
+}
+
+/*
+ * Lookup RPCSEC_GSS cred for the current process
+ */
+static struct rpc_cred *
+gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	return rpcauth_lookup_credcache(auth, acred, flags);
+}
+
+static struct rpc_cred *
+gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	struct gss_cred	*cred = NULL;
+	int err = -ENOMEM;
+
+	dprintk("RPC:       %s for uid %d, flavor %d\n",
+		__func__, from_kuid(&init_user_ns, acred->uid),
+		auth->au_flavor);
+
+	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
+		goto out_err;
+
+	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
+	/*
+	 * Note: in order to force a call to call_refresh(), we deliberately
+	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
+	 */
+	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
+	cred->gc_service = gss_auth->service;
+	cred->gc_principal = NULL;
+	if (acred->machine_cred)
+		cred->gc_principal = acred->principal;
+	kref_get(&gss_auth->kref);
+	return &cred->gc_base;
+
+out_err:
+	dprintk("RPC:       %s failed with error %d\n", __func__, err);
+	return ERR_PTR(err);
+}
+
+static int
+gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
+	int err;
+
+	do {
+		err = gss_create_upcall(gss_auth, gss_cred);
+	} while (err == -EAGAIN);
+	return err;
+}
+
+static char *
+gss_stringify_acceptor(struct rpc_cred *cred)
+{
+	char *string = NULL;
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx;
+	unsigned int len;
+	struct xdr_netobj *acceptor;
+
+	rcu_read_lock();
+	ctx = rcu_dereference(gss_cred->gc_ctx);
+	if (!ctx)
+		goto out;
+
+	len = ctx->gc_acceptor.len;
+	rcu_read_unlock();
+
+	/* no point if there's no string */
+	if (!len)
+		return NULL;
+realloc:
+	string = kmalloc(len + 1, GFP_KERNEL);
+	if (!string)
+		return NULL;
+
+	rcu_read_lock();
+	ctx = rcu_dereference(gss_cred->gc_ctx);
+
+	/* did the ctx disappear or was it replaced by one with no acceptor? */
+	if (!ctx || !ctx->gc_acceptor.len) {
+		kfree(string);
+		string = NULL;
+		goto out;
+	}
+
+	acceptor = &ctx->gc_acceptor;
+
+	/*
+	 * Did we find a new acceptor that's longer than the original? Allocate
+	 * a longer buffer and try again.
+	 */
+	if (len < acceptor->len) {
+		len = acceptor->len;
+		rcu_read_unlock();
+		kfree(string);
+		goto realloc;
+	}
+
+	memcpy(string, acceptor->data, acceptor->len);
+	string[acceptor->len] = '\0';
+out:
+	rcu_read_unlock();
+	return string;
+}
+
+/*
+ * Returns -EACCES if GSS context is NULL or will expire within the
+ * timeout (miliseconds)
+ */
+static int
+gss_key_timeout(struct rpc_cred *rc)
+{
+	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx;
+	unsigned long now = jiffies;
+	unsigned long expire;
+
+	rcu_read_lock();
+	ctx = rcu_dereference(gss_cred->gc_ctx);
+	if (ctx)
+		expire = ctx->gc_expiry - (gss_key_expire_timeo * HZ);
+	rcu_read_unlock();
+	if (!ctx || time_after(now, expire))
+		return -EACCES;
+	return 0;
+}
+
+static int
+gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
+{
+	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx;
+	int ret;
+
+	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
+		goto out;
+	/* Don't match with creds that have expired. */
+	rcu_read_lock();
+	ctx = rcu_dereference(gss_cred->gc_ctx);
+	if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
+		rcu_read_unlock();
+		return 0;
+	}
+	rcu_read_unlock();
+	if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
+		return 0;
+out:
+	if (acred->principal != NULL) {
+		if (gss_cred->gc_principal == NULL)
+			return 0;
+		ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
+		goto check_expire;
+	}
+	if (gss_cred->gc_principal != NULL)
+		return 0;
+	ret = uid_eq(rc->cr_uid, acred->uid);
+
+check_expire:
+	if (ret == 0)
+		return ret;
+
+	/* Notify acred users of GSS context expiration timeout */
+	if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
+	    (gss_key_timeout(rc) != 0)) {
+		/* test will now be done from generic cred */
+		test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
+		/* tell NFS layer that key will expire soon */
+		set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
+	}
+	return ret;
+}
+
+/*
+* Marshal credentials.
+* Maybe we should keep a cached credential for performance reasons.
+*/
+static __be32 *
+gss_marshal(struct rpc_task *task, __be32 *p)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_cred *cred = req->rq_cred;
+	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
+						 gc_base);
+	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
+	__be32		*cred_len;
+	u32             maj_stat = 0;
+	struct xdr_netobj mic;
+	struct kvec	iov;
+	struct xdr_buf	verf_buf;
+
+	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
+
+	*p++ = htonl(RPC_AUTH_GSS);
+	cred_len = p++;
+
+	spin_lock(&ctx->gc_seq_lock);
+	req->rq_seqno = ctx->gc_seq++;
+	spin_unlock(&ctx->gc_seq_lock);
+
+	*p++ = htonl((u32) RPC_GSS_VERSION);
+	*p++ = htonl((u32) ctx->gc_proc);
+	*p++ = htonl((u32) req->rq_seqno);
+	*p++ = htonl((u32) gss_cred->gc_service);
+	p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
+	*cred_len = htonl((p - (cred_len + 1)) << 2);
+
+	/* We compute the checksum for the verifier over the xdr-encoded bytes
+	 * starting with the xid and ending at the end of the credential: */
+	iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
+					req->rq_snd_buf.head[0].iov_base);
+	iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
+	xdr_buf_from_iov(&iov, &verf_buf);
+
+	/* set verifier flavor*/
+	*p++ = htonl(RPC_AUTH_GSS);
+
+	mic.data = (u8 *)(p + 1);
+	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	} else if (maj_stat != 0) {
+		printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
+		goto out_put_ctx;
+	}
+	p = xdr_encode_opaque(p, NULL, mic.len);
+	gss_put_ctx(ctx);
+	return p;
+out_put_ctx:
+	gss_put_ctx(ctx);
+	return NULL;
+}
+
+static int gss_renew_cred(struct rpc_task *task)
+{
+	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
+	struct gss_cred *gss_cred = container_of(oldcred,
+						 struct gss_cred,
+						 gc_base);
+	struct rpc_auth *auth = oldcred->cr_auth;
+	struct auth_cred acred = {
+		.uid = oldcred->cr_uid,
+		.principal = gss_cred->gc_principal,
+		.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
+	};
+	struct rpc_cred *new;
+
+	new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
+	if (IS_ERR(new))
+		return PTR_ERR(new);
+	task->tk_rqstp->rq_cred = new;
+	put_rpccred(oldcred);
+	return 0;
+}
+
+static int gss_cred_is_negative_entry(struct rpc_cred *cred)
+{
+	if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
+		unsigned long now = jiffies;
+		unsigned long begin, expire;
+		struct gss_cred *gss_cred; 
+
+		gss_cred = container_of(cred, struct gss_cred, gc_base);
+		begin = gss_cred->gc_upcall_timestamp;
+		expire = begin + gss_expired_cred_retry_delay * HZ;
+
+		if (time_in_range_open(now, begin, expire))
+			return 1;
+	}
+	return 0;
+}
+
+/*
+* Refresh credentials. XXX - finish
+*/
+static int
+gss_refresh(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+	int ret = 0;
+
+	if (gss_cred_is_negative_entry(cred))
+		return -EKEYEXPIRED;
+
+	if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
+			!test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
+		ret = gss_renew_cred(task);
+		if (ret < 0)
+			goto out;
+		cred = task->tk_rqstp->rq_cred;
+	}
+
+	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+		ret = gss_refresh_upcall(task);
+out:
+	return ret;
+}
+
+/* Dummy refresh routine: used only when destroying the context */
+static int
+gss_refresh_null(struct rpc_task *task)
+{
+	return 0;
+}
+
+static __be32 *
+gss_validate(struct rpc_task *task, __be32 *p)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	__be32		seq;
+	struct kvec	iov;
+	struct xdr_buf	verf_buf;
+	struct xdr_netobj mic;
+	u32		flav,len;
+	u32		maj_stat;
+	__be32		*ret = ERR_PTR(-EIO);
+
+	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
+
+	flav = ntohl(*p++);
+	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
+		goto out_bad;
+	if (flav != RPC_AUTH_GSS)
+		goto out_bad;
+	seq = htonl(task->tk_rqstp->rq_seqno);
+	iov.iov_base = &seq;
+	iov.iov_len = sizeof(seq);
+	xdr_buf_from_iov(&iov, &verf_buf);
+	mic.data = (u8 *)p;
+	mic.len = len;
+
+	ret = ERR_PTR(-EACCES);
+	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	if (maj_stat) {
+		dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
+			task->tk_pid, __func__, maj_stat);
+		goto out_bad;
+	}
+	/* We leave it to unwrap to calculate au_rslack. For now we just
+	 * calculate the length of the verifier: */
+	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
+	gss_put_ctx(ctx);
+	dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
+			task->tk_pid, __func__);
+	return p + XDR_QUADLEN(len);
+out_bad:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
+		PTR_ERR(ret));
+	return ret;
+}
+
+static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
+				__be32 *p, void *obj)
+{
+	struct xdr_stream xdr;
+
+	xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
+	encode(rqstp, &xdr, obj);
+}
+
+static inline int
+gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		   kxdreproc_t encode, struct rpc_rqst *rqstp,
+		   __be32 *p, void *obj)
+{
+	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
+	struct xdr_buf	integ_buf;
+	__be32          *integ_len = NULL;
+	struct xdr_netobj mic;
+	u32		offset;
+	__be32		*q;
+	struct kvec	*iov;
+	u32             maj_stat = 0;
+	int		status = -EIO;
+
+	integ_len = p++;
+	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+	*p++ = htonl(rqstp->rq_seqno);
+
+	gss_wrap_req_encode(encode, rqstp, p, obj);
+
+	if (xdr_buf_subsegment(snd_buf, &integ_buf,
+				offset, snd_buf->len - offset))
+		return status;
+	*integ_len = htonl(integ_buf.len);
+
+	/* guess whether we're in the head or the tail: */
+	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
+		iov = snd_buf->tail;
+	else
+		iov = snd_buf->head;
+	p = iov->iov_base + iov->iov_len;
+	mic.data = (u8 *)(p + 1);
+
+	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
+	status = -EIO; /* XXX? */
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	else if (maj_stat)
+		return status;
+	q = xdr_encode_opaque(p, NULL, mic.len);
+
+	offset = (u8 *)q - (u8 *)p;
+	iov->iov_len += offset;
+	snd_buf->len += offset;
+	return 0;
+}
+
+static void
+priv_release_snd_buf(struct rpc_rqst *rqstp)
+{
+	int i;
+
+	for (i=0; i < rqstp->rq_enc_pages_num; i++)
+		__free_page(rqstp->rq_enc_pages[i]);
+	kfree(rqstp->rq_enc_pages);
+}
+
+static int
+alloc_enc_pages(struct rpc_rqst *rqstp)
+{
+	struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
+	int first, last, i;
+
+	if (snd_buf->page_len == 0) {
+		rqstp->rq_enc_pages_num = 0;
+		return 0;
+	}
+
+	first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
+	last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
+	rqstp->rq_enc_pages_num = last - first + 1 + 1;
+	rqstp->rq_enc_pages
+		= kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
+				GFP_NOFS);
+	if (!rqstp->rq_enc_pages)
+		goto out;
+	for (i=0; i < rqstp->rq_enc_pages_num; i++) {
+		rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
+		if (rqstp->rq_enc_pages[i] == NULL)
+			goto out_free;
+	}
+	rqstp->rq_release_snd_buf = priv_release_snd_buf;
+	return 0;
+out_free:
+	rqstp->rq_enc_pages_num = i;
+	priv_release_snd_buf(rqstp);
+out:
+	return -EAGAIN;
+}
+
+static inline int
+gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		  kxdreproc_t encode, struct rpc_rqst *rqstp,
+		  __be32 *p, void *obj)
+{
+	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
+	u32		offset;
+	u32             maj_stat;
+	int		status;
+	__be32		*opaque_len;
+	struct page	**inpages;
+	int		first;
+	int		pad;
+	struct kvec	*iov;
+	char		*tmp;
+
+	opaque_len = p++;
+	offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+	*p++ = htonl(rqstp->rq_seqno);
+
+	gss_wrap_req_encode(encode, rqstp, p, obj);
+
+	status = alloc_enc_pages(rqstp);
+	if (status)
+		return status;
+	first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
+	inpages = snd_buf->pages + first;
+	snd_buf->pages = rqstp->rq_enc_pages;
+	snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
+	/*
+	 * Give the tail its own page, in case we need extra space in the
+	 * head when wrapping:
+	 *
+	 * call_allocate() allocates twice the slack space required
+	 * by the authentication flavor to rq_callsize.
+	 * For GSS, slack is GSS_CRED_SLACK.
+	 */
+	if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
+		tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
+		memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
+		snd_buf->tail[0].iov_base = tmp;
+	}
+	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
+	/* slack space should prevent this ever happening: */
+	BUG_ON(snd_buf->len > snd_buf->buflen);
+	status = -EIO;
+	/* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
+	 * done anyway, so it's safe to put the request on the wire: */
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	else if (maj_stat)
+		return status;
+
+	*opaque_len = htonl(snd_buf->len - offset);
+	/* guess whether we're in the head or the tail: */
+	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
+		iov = snd_buf->tail;
+	else
+		iov = snd_buf->head;
+	p = iov->iov_base + iov->iov_len;
+	pad = 3 - ((snd_buf->len - offset - 1) & 3);
+	memset(p, 0, pad);
+	iov->iov_len += pad;
+	snd_buf->len += pad;
+
+	return 0;
+}
+
+static int
+gss_wrap_req(struct rpc_task *task,
+	     kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
+			gc_base);
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	int             status = -EIO;
+
+	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
+	if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
+		/* The spec seems a little ambiguous here, but I think that not
+		 * wrapping context destruction requests makes the most sense.
+		 */
+		gss_wrap_req_encode(encode, rqstp, p, obj);
+		status = 0;
+		goto out;
+	}
+	switch (gss_cred->gc_service) {
+	case RPC_GSS_SVC_NONE:
+		gss_wrap_req_encode(encode, rqstp, p, obj);
+		status = 0;
+		break;
+	case RPC_GSS_SVC_INTEGRITY:
+		status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
+		break;
+	case RPC_GSS_SVC_PRIVACY:
+		status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
+		break;
+	}
+out:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
+	return status;
+}
+
+static inline int
+gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		struct rpc_rqst *rqstp, __be32 **p)
+{
+	struct xdr_buf	*rcv_buf = &rqstp->rq_rcv_buf;
+	struct xdr_buf integ_buf;
+	struct xdr_netobj mic;
+	u32 data_offset, mic_offset;
+	u32 integ_len;
+	u32 maj_stat;
+	int status = -EIO;
+
+	integ_len = ntohl(*(*p)++);
+	if (integ_len & 3)
+		return status;
+	data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
+	mic_offset = integ_len + data_offset;
+	if (mic_offset > rcv_buf->len)
+		return status;
+	if (ntohl(*(*p)++) != rqstp->rq_seqno)
+		return status;
+
+	if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
+				mic_offset - data_offset))
+		return status;
+
+	if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
+		return status;
+
+	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	if (maj_stat != GSS_S_COMPLETE)
+		return status;
+	return 0;
+}
+
+static inline int
+gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+		struct rpc_rqst *rqstp, __be32 **p)
+{
+	struct xdr_buf  *rcv_buf = &rqstp->rq_rcv_buf;
+	u32 offset;
+	u32 opaque_len;
+	u32 maj_stat;
+	int status = -EIO;
+
+	opaque_len = ntohl(*(*p)++);
+	offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
+	if (offset + opaque_len > rcv_buf->len)
+		return status;
+	/* remove padding: */
+	rcv_buf->len = offset + opaque_len;
+
+	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
+	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	if (maj_stat != GSS_S_COMPLETE)
+		return status;
+	if (ntohl(*(*p)++) != rqstp->rq_seqno)
+		return status;
+
+	return 0;
+}
+
+static int
+gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
+		      __be32 *p, void *obj)
+{
+	struct xdr_stream xdr;
+
+	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
+	return decode(rqstp, &xdr, obj);
+}
+
+static int
+gss_unwrap_resp(struct rpc_task *task,
+		kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
+{
+	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
+			gc_base);
+	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+	__be32		*savedp = p;
+	struct kvec	*head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
+	int		savedlen = head->iov_len;
+	int             status = -EIO;
+
+	if (ctx->gc_proc != RPC_GSS_PROC_DATA)
+		goto out_decode;
+	switch (gss_cred->gc_service) {
+	case RPC_GSS_SVC_NONE:
+		break;
+	case RPC_GSS_SVC_INTEGRITY:
+		status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
+		if (status)
+			goto out;
+		break;
+	case RPC_GSS_SVC_PRIVACY:
+		status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
+		if (status)
+			goto out;
+		break;
+	}
+	/* take into account extra slack for integrity and privacy cases: */
+	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
+						+ (savedlen - head->iov_len);
+out_decode:
+	status = gss_unwrap_req_decode(decode, rqstp, p, obj);
+out:
+	gss_put_ctx(ctx);
+	dprintk("RPC: %5u %s returning %d\n",
+		task->tk_pid, __func__, status);
+	return status;
+}
+
+static const struct rpc_authops authgss_ops = {
+	.owner		= THIS_MODULE,
+	.au_flavor	= RPC_AUTH_GSS,
+	.au_name	= "RPCSEC_GSS",
+	.create		= gss_create,
+	.destroy	= gss_destroy,
+	.lookup_cred	= gss_lookup_cred,
+	.crcreate	= gss_create_cred,
+	.list_pseudoflavors = gss_mech_list_pseudoflavors,
+	.info2flavor	= gss_mech_info2flavor,
+	.flavor2info	= gss_mech_flavor2info,
+};
+
+static const struct rpc_credops gss_credops = {
+	.cr_name		= "AUTH_GSS",
+	.crdestroy		= gss_destroy_cred,
+	.cr_init		= gss_cred_init,
+	.crbind			= rpcauth_generic_bind_cred,
+	.crmatch		= gss_match,
+	.crmarshal		= gss_marshal,
+	.crrefresh		= gss_refresh,
+	.crvalidate		= gss_validate,
+	.crwrap_req		= gss_wrap_req,
+	.crunwrap_resp		= gss_unwrap_resp,
+	.crkey_timeout		= gss_key_timeout,
+	.crstringify_acceptor	= gss_stringify_acceptor,
+};
+
+static const struct rpc_credops gss_nullops = {
+	.cr_name		= "AUTH_GSS",
+	.crdestroy		= gss_destroy_nullcred,
+	.crbind			= rpcauth_generic_bind_cred,
+	.crmatch		= gss_match,
+	.crmarshal		= gss_marshal,
+	.crrefresh		= gss_refresh_null,
+	.crvalidate		= gss_validate,
+	.crwrap_req		= gss_wrap_req,
+	.crunwrap_resp		= gss_unwrap_resp,
+	.crstringify_acceptor	= gss_stringify_acceptor,
+};
+
+static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
+	.upcall		= rpc_pipe_generic_upcall,
+	.downcall	= gss_pipe_downcall,
+	.destroy_msg	= gss_pipe_destroy_msg,
+	.open_pipe	= gss_pipe_open_v0,
+	.release_pipe	= gss_pipe_release,
+};
+
+static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
+	.upcall		= rpc_pipe_generic_upcall,
+	.downcall	= gss_pipe_downcall,
+	.destroy_msg	= gss_pipe_destroy_msg,
+	.open_pipe	= gss_pipe_open_v1,
+	.release_pipe	= gss_pipe_release,
+};
+
+static __net_init int rpcsec_gss_init_net(struct net *net)
+{
+	return gss_svc_init_net(net);
+}
+
+static __net_exit void rpcsec_gss_exit_net(struct net *net)
+{
+	gss_svc_shutdown_net(net);
+}
+
+static struct pernet_operations rpcsec_gss_net_ops = {
+	.init = rpcsec_gss_init_net,
+	.exit = rpcsec_gss_exit_net,
+};
+
+/*
+ * Initialize RPCSEC_GSS module
+ */
+static int __init init_rpcsec_gss(void)
+{
+	int err = 0;
+
+	err = rpcauth_register(&authgss_ops);
+	if (err)
+		goto out;
+	err = gss_svc_init();
+	if (err)
+		goto out_unregister;
+	err = register_pernet_subsys(&rpcsec_gss_net_ops);
+	if (err)
+		goto out_svc_exit;
+	rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
+	return 0;
+out_svc_exit:
+	gss_svc_shutdown();
+out_unregister:
+	rpcauth_unregister(&authgss_ops);
+out:
+	return err;
+}
+
+static void __exit exit_rpcsec_gss(void)
+{
+	unregister_pernet_subsys(&rpcsec_gss_net_ops);
+	gss_svc_shutdown();
+	rpcauth_unregister(&authgss_ops);
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
+}
+
+MODULE_ALIAS("rpc-auth-6");
+MODULE_LICENSE("GPL");
+module_param_named(expired_cred_retry_delay,
+		   gss_expired_cred_retry_delay,
+		   uint, 0644);
+MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
+		"the RPC engine retries an expired credential");
+
+module_param_named(key_expire_timeo,
+		   gss_key_expire_timeo,
+		   uint, 0644);
+MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
+		"credential keys lifetime where the NFS layer cleans up "
+		"prior to key expiration");
+
+module_init(init_rpcsec_gss)
+module_exit(exit_rpcsec_gss)
diff --git a/kernel/net/sunrpc/auth_gss/gss_generic_token.c b/kernel/net/sunrpc/auth_gss/gss_generic_token.c
new file mode 100644
index 000000000..254defe44
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_generic_token.c
@@ -0,0 +1,234 @@
+/*
+ *  linux/net/sunrpc/gss_generic_token.c
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/generic/util_token.c
+ *
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/gss_asn1.h>
+
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+
+/* TWRITE_STR from gssapiP_generic.h */
+#define TWRITE_STR(ptr, str, len) \
+	memcpy((ptr), (char *) (str), (len)); \
+	(ptr) += (len);
+
+/* XXXX this code currently makes the assumption that a mech oid will
+   never be longer than 127 bytes.  This assumption is not inherent in
+   the interfaces, so the code can be fixed if the OSI namespace
+   balloons unexpectedly. */
+
+/* Each token looks like this:
+
+0x60				tag for APPLICATION 0, SEQUENCE
+					(constructed, definite-length)
+	<length>		possible multiple bytes, need to parse/generate
+	0x06			tag for OBJECT IDENTIFIER
+		<moid_length>	compile-time constant string (assume 1 byte)
+		<moid_bytes>	compile-time constant string
+	<inner_bytes>		the ANY containing the application token
+					bytes 0,1 are the token type
+					bytes 2,n are the token data
+
+For the purposes of this abstraction, the token "header" consists of
+the sequence tag and length octets, the mech OID DER encoding, and the
+first two inner bytes, which indicate the token type.  The token
+"body" consists of everything else.
+
+*/
+
+static int
+der_length_size( int length)
+{
+	if (length < (1<<7))
+		return 1;
+	else if (length < (1<<8))
+		return 2;
+#if (SIZEOF_INT == 2)
+	else
+		return 3;
+#else
+	else if (length < (1<<16))
+		return 3;
+	else if (length < (1<<24))
+		return 4;
+	else
+		return 5;
+#endif
+}
+
+static void
+der_write_length(unsigned char **buf, int length)
+{
+	if (length < (1<<7)) {
+		*(*buf)++ = (unsigned char) length;
+	} else {
+		*(*buf)++ = (unsigned char) (der_length_size(length)+127);
+#if (SIZEOF_INT > 2)
+		if (length >= (1<<24))
+			*(*buf)++ = (unsigned char) (length>>24);
+		if (length >= (1<<16))
+			*(*buf)++ = (unsigned char) ((length>>16)&0xff);
+#endif
+		if (length >= (1<<8))
+			*(*buf)++ = (unsigned char) ((length>>8)&0xff);
+		*(*buf)++ = (unsigned char) (length&0xff);
+	}
+}
+
+/* returns decoded length, or < 0 on failure.  Advances buf and
+   decrements bufsize */
+
+static int
+der_read_length(unsigned char **buf, int *bufsize)
+{
+	unsigned char sf;
+	int ret;
+
+	if (*bufsize < 1)
+		return -1;
+	sf = *(*buf)++;
+	(*bufsize)--;
+	if (sf & 0x80) {
+		if ((sf &= 0x7f) > ((*bufsize)-1))
+			return -1;
+		if (sf > SIZEOF_INT)
+			return -1;
+		ret = 0;
+		for (; sf; sf--) {
+			ret = (ret<<8) + (*(*buf)++);
+			(*bufsize)--;
+		}
+	} else {
+		ret = sf;
+	}
+
+	return ret;
+}
+
+/* returns the length of a token, given the mech oid and the body size */
+
+int
+g_token_size(struct xdr_netobj *mech, unsigned int body_size)
+{
+	/* set body_size to sequence contents size */
+	body_size += 2 + (int) mech->len;         /* NEED overflow check */
+	return 1 + der_length_size(body_size) + body_size;
+}
+
+EXPORT_SYMBOL_GPL(g_token_size);
+
+/* fills in a buffer with the token header.  The buffer is assumed to
+   be the right size.  buf is advanced past the token header */
+
+void
+g_make_token_header(struct xdr_netobj *mech, int body_size, unsigned char **buf)
+{
+	*(*buf)++ = 0x60;
+	der_write_length(buf, 2 + mech->len + body_size);
+	*(*buf)++ = 0x06;
+	*(*buf)++ = (unsigned char) mech->len;
+	TWRITE_STR(*buf, mech->data, ((int) mech->len));
+}
+
+EXPORT_SYMBOL_GPL(g_make_token_header);
+
+/*
+ * Given a buffer containing a token, reads and verifies the token,
+ * leaving buf advanced past the token header, and setting body_size
+ * to the number of remaining bytes.  Returns 0 on success,
+ * G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
+ * mechanism in the token does not match the mech argument.  buf and
+ * *body_size are left unmodified on error.
+ */
+u32
+g_verify_token_header(struct xdr_netobj *mech, int *body_size,
+		      unsigned char **buf_in, int toksize)
+{
+	unsigned char *buf = *buf_in;
+	int seqsize;
+	struct xdr_netobj toid;
+	int ret = 0;
+
+	if ((toksize-=1) < 0)
+		return G_BAD_TOK_HEADER;
+	if (*buf++ != 0x60)
+		return G_BAD_TOK_HEADER;
+
+	if ((seqsize = der_read_length(&buf, &toksize)) < 0)
+		return G_BAD_TOK_HEADER;
+
+	if (seqsize != toksize)
+		return G_BAD_TOK_HEADER;
+
+	if ((toksize-=1) < 0)
+		return G_BAD_TOK_HEADER;
+	if (*buf++ != 0x06)
+		return G_BAD_TOK_HEADER;
+
+	if ((toksize-=1) < 0)
+		return G_BAD_TOK_HEADER;
+	toid.len = *buf++;
+
+	if ((toksize-=toid.len) < 0)
+		return G_BAD_TOK_HEADER;
+	toid.data = buf;
+	buf+=toid.len;
+
+	if (! g_OID_equal(&toid, mech))
+		ret = G_WRONG_MECH;
+
+   /* G_WRONG_MECH is not returned immediately because it's more important
+      to return G_BAD_TOK_HEADER if the token header is in fact bad */
+
+	if ((toksize-=2) < 0)
+		return G_BAD_TOK_HEADER;
+
+	if (ret)
+		return ret;
+
+	if (!ret) {
+		*buf_in = buf;
+		*body_size = toksize;
+	}
+
+	return ret;
+}
+
+EXPORT_SYMBOL_GPL(g_verify_token_header);
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_crypto.c b/kernel/net/sunrpc/auth_gss/gss_krb5_crypto.c
new file mode 100644
index 000000000..b5408e8a3
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -0,0 +1,988 @@
+/*
+ *  linux/net/sunrpc/gss_krb5_crypto.c
+ *
+ *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ *  Bruce Fields   <bfields@umich.edu>
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may require
+ * a specific license from the United States Government.  It is the
+ * responsibility of any person or organization contemplating export to
+ * obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/random.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/sunrpc/xdr.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+u32
+krb5_encrypt(
+	struct crypto_blkcipher *tfm,
+	void * iv,
+	void * in,
+	void * out,
+	int length)
+{
+	u32 ret = -EINVAL;
+	struct scatterlist sg[1];
+	u8 local_iv[GSS_KRB5_MAX_BLOCKSIZE] = {0};
+	struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
+
+	if (length % crypto_blkcipher_blocksize(tfm) != 0)
+		goto out;
+
+	if (crypto_blkcipher_ivsize(tfm) > GSS_KRB5_MAX_BLOCKSIZE) {
+		dprintk("RPC:       gss_k5encrypt: tfm iv size too large %d\n",
+			crypto_blkcipher_ivsize(tfm));
+		goto out;
+	}
+
+	if (iv)
+		memcpy(local_iv, iv, crypto_blkcipher_ivsize(tfm));
+
+	memcpy(out, in, length);
+	sg_init_one(sg, out, length);
+
+	ret = crypto_blkcipher_encrypt_iv(&desc, sg, sg, length);
+out:
+	dprintk("RPC:       krb5_encrypt returns %d\n", ret);
+	return ret;
+}
+
+u32
+krb5_decrypt(
+     struct crypto_blkcipher *tfm,
+     void * iv,
+     void * in,
+     void * out,
+     int length)
+{
+	u32 ret = -EINVAL;
+	struct scatterlist sg[1];
+	u8 local_iv[GSS_KRB5_MAX_BLOCKSIZE] = {0};
+	struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
+
+	if (length % crypto_blkcipher_blocksize(tfm) != 0)
+		goto out;
+
+	if (crypto_blkcipher_ivsize(tfm) > GSS_KRB5_MAX_BLOCKSIZE) {
+		dprintk("RPC:       gss_k5decrypt: tfm iv size too large %d\n",
+			crypto_blkcipher_ivsize(tfm));
+		goto out;
+	}
+	if (iv)
+		memcpy(local_iv,iv, crypto_blkcipher_ivsize(tfm));
+
+	memcpy(out, in, length);
+	sg_init_one(sg, out, length);
+
+	ret = crypto_blkcipher_decrypt_iv(&desc, sg, sg, length);
+out:
+	dprintk("RPC:       gss_k5decrypt returns %d\n",ret);
+	return ret;
+}
+
+static int
+checksummer(struct scatterlist *sg, void *data)
+{
+	struct hash_desc *desc = data;
+
+	return crypto_hash_update(desc, sg, sg->length);
+}
+
+static int
+arcfour_hmac_md5_usage_to_salt(unsigned int usage, u8 salt[4])
+{
+	unsigned int ms_usage;
+
+	switch (usage) {
+	case KG_USAGE_SIGN:
+		ms_usage = 15;
+		break;
+	case KG_USAGE_SEAL:
+		ms_usage = 13;
+		break;
+	default:
+		return -EINVAL;
+	}
+	salt[0] = (ms_usage >> 0) & 0xff;
+	salt[1] = (ms_usage >> 8) & 0xff;
+	salt[2] = (ms_usage >> 16) & 0xff;
+	salt[3] = (ms_usage >> 24) & 0xff;
+
+	return 0;
+}
+
+static u32
+make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
+		       struct xdr_buf *body, int body_offset, u8 *cksumkey,
+		       unsigned int usage, struct xdr_netobj *cksumout)
+{
+	struct hash_desc                desc;
+	struct scatterlist              sg[1];
+	int err;
+	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	u8 rc4salt[4];
+	struct crypto_hash *md5;
+	struct crypto_hash *hmac_md5;
+
+	if (cksumkey == NULL)
+		return GSS_S_FAILURE;
+
+	if (cksumout->len < kctx->gk5e->cksumlength) {
+		dprintk("%s: checksum buffer length, %u, too small for %s\n",
+			__func__, cksumout->len, kctx->gk5e->name);
+		return GSS_S_FAILURE;
+	}
+
+	if (arcfour_hmac_md5_usage_to_salt(usage, rc4salt)) {
+		dprintk("%s: invalid usage value %u\n", __func__, usage);
+		return GSS_S_FAILURE;
+	}
+
+	md5 = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(md5))
+		return GSS_S_FAILURE;
+
+	hmac_md5 = crypto_alloc_hash(kctx->gk5e->cksum_name, 0,
+				     CRYPTO_ALG_ASYNC);
+	if (IS_ERR(hmac_md5)) {
+		crypto_free_hash(md5);
+		return GSS_S_FAILURE;
+	}
+
+	desc.tfm = md5;
+	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out;
+	sg_init_one(sg, rc4salt, 4);
+	err = crypto_hash_update(&desc, sg, 4);
+	if (err)
+		goto out;
+
+	sg_init_one(sg, header, hdrlen);
+	err = crypto_hash_update(&desc, sg, hdrlen);
+	if (err)
+		goto out;
+	err = xdr_process_buf(body, body_offset, body->len - body_offset,
+			      checksummer, &desc);
+	if (err)
+		goto out;
+	err = crypto_hash_final(&desc, checksumdata);
+	if (err)
+		goto out;
+
+	desc.tfm = hmac_md5;
+	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out;
+	err = crypto_hash_setkey(hmac_md5, cksumkey, kctx->gk5e->keylength);
+	if (err)
+		goto out;
+
+	sg_init_one(sg, checksumdata, crypto_hash_digestsize(md5));
+	err = crypto_hash_digest(&desc, sg, crypto_hash_digestsize(md5),
+				 checksumdata);
+	if (err)
+		goto out;
+
+	memcpy(cksumout->data, checksumdata, kctx->gk5e->cksumlength);
+	cksumout->len = kctx->gk5e->cksumlength;
+out:
+	crypto_free_hash(md5);
+	crypto_free_hash(hmac_md5);
+	return err ? GSS_S_FAILURE : 0;
+}
+
+/*
+ * checksum the plaintext data and hdrlen bytes of the token header
+ * The checksum is performed over the first 8 bytes of the
+ * gss token header and then over the data body
+ */
+u32
+make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
+	      struct xdr_buf *body, int body_offset, u8 *cksumkey,
+	      unsigned int usage, struct xdr_netobj *cksumout)
+{
+	struct hash_desc                desc;
+	struct scatterlist              sg[1];
+	int err;
+	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	unsigned int checksumlen;
+
+	if (kctx->gk5e->ctype == CKSUMTYPE_HMAC_MD5_ARCFOUR)
+		return make_checksum_hmac_md5(kctx, header, hdrlen,
+					      body, body_offset,
+					      cksumkey, usage, cksumout);
+
+	if (cksumout->len < kctx->gk5e->cksumlength) {
+		dprintk("%s: checksum buffer length, %u, too small for %s\n",
+			__func__, cksumout->len, kctx->gk5e->name);
+		return GSS_S_FAILURE;
+	}
+
+	desc.tfm = crypto_alloc_hash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(desc.tfm))
+		return GSS_S_FAILURE;
+	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	checksumlen = crypto_hash_digestsize(desc.tfm);
+
+	if (cksumkey != NULL) {
+		err = crypto_hash_setkey(desc.tfm, cksumkey,
+					 kctx->gk5e->keylength);
+		if (err)
+			goto out;
+	}
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out;
+	sg_init_one(sg, header, hdrlen);
+	err = crypto_hash_update(&desc, sg, hdrlen);
+	if (err)
+		goto out;
+	err = xdr_process_buf(body, body_offset, body->len - body_offset,
+			      checksummer, &desc);
+	if (err)
+		goto out;
+	err = crypto_hash_final(&desc, checksumdata);
+	if (err)
+		goto out;
+
+	switch (kctx->gk5e->ctype) {
+	case CKSUMTYPE_RSA_MD5:
+		err = kctx->gk5e->encrypt(kctx->seq, NULL, checksumdata,
+					  checksumdata, checksumlen);
+		if (err)
+			goto out;
+		memcpy(cksumout->data,
+		       checksumdata + checksumlen - kctx->gk5e->cksumlength,
+		       kctx->gk5e->cksumlength);
+		break;
+	case CKSUMTYPE_HMAC_SHA1_DES3:
+		memcpy(cksumout->data, checksumdata, kctx->gk5e->cksumlength);
+		break;
+	default:
+		BUG();
+		break;
+	}
+	cksumout->len = kctx->gk5e->cksumlength;
+out:
+	crypto_free_hash(desc.tfm);
+	return err ? GSS_S_FAILURE : 0;
+}
+
+/*
+ * checksum the plaintext data and hdrlen bytes of the token header
+ * Per rfc4121, sec. 4.2.4, the checksum is performed over the data
+ * body then over the first 16 octets of the MIC token
+ * Inclusion of the header data in the calculation of the
+ * checksum is optional.
+ */
+u32
+make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
+		 struct xdr_buf *body, int body_offset, u8 *cksumkey,
+		 unsigned int usage, struct xdr_netobj *cksumout)
+{
+	struct hash_desc desc;
+	struct scatterlist sg[1];
+	int err;
+	u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	unsigned int checksumlen;
+
+	if (kctx->gk5e->keyed_cksum == 0) {
+		dprintk("%s: expected keyed hash for %s\n",
+			__func__, kctx->gk5e->name);
+		return GSS_S_FAILURE;
+	}
+	if (cksumkey == NULL) {
+		dprintk("%s: no key supplied for %s\n",
+			__func__, kctx->gk5e->name);
+		return GSS_S_FAILURE;
+	}
+
+	desc.tfm = crypto_alloc_hash(kctx->gk5e->cksum_name, 0,
+							CRYPTO_ALG_ASYNC);
+	if (IS_ERR(desc.tfm))
+		return GSS_S_FAILURE;
+	checksumlen = crypto_hash_digestsize(desc.tfm);
+	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	err = crypto_hash_setkey(desc.tfm, cksumkey, kctx->gk5e->keylength);
+	if (err)
+		goto out;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out;
+	err = xdr_process_buf(body, body_offset, body->len - body_offset,
+			      checksummer, &desc);
+	if (err)
+		goto out;
+	if (header != NULL) {
+		sg_init_one(sg, header, hdrlen);
+		err = crypto_hash_update(&desc, sg, hdrlen);
+		if (err)
+			goto out;
+	}
+	err = crypto_hash_final(&desc, checksumdata);
+	if (err)
+		goto out;
+
+	cksumout->len = kctx->gk5e->cksumlength;
+
+	switch (kctx->gk5e->ctype) {
+	case CKSUMTYPE_HMAC_SHA1_96_AES128:
+	case CKSUMTYPE_HMAC_SHA1_96_AES256:
+		/* note that this truncates the hash */
+		memcpy(cksumout->data, checksumdata, kctx->gk5e->cksumlength);
+		break;
+	default:
+		BUG();
+		break;
+	}
+out:
+	crypto_free_hash(desc.tfm);
+	return err ? GSS_S_FAILURE : 0;
+}
+
+struct encryptor_desc {
+	u8 iv[GSS_KRB5_MAX_BLOCKSIZE];
+	struct blkcipher_desc desc;
+	int pos;
+	struct xdr_buf *outbuf;
+	struct page **pages;
+	struct scatterlist infrags[4];
+	struct scatterlist outfrags[4];
+	int fragno;
+	int fraglen;
+};
+
+static int
+encryptor(struct scatterlist *sg, void *data)
+{
+	struct encryptor_desc *desc = data;
+	struct xdr_buf *outbuf = desc->outbuf;
+	struct page *in_page;
+	int thislen = desc->fraglen + sg->length;
+	int fraglen, ret;
+	int page_pos;
+
+	/* Worst case is 4 fragments: head, end of page 1, start
+	 * of page 2, tail.  Anything more is a bug. */
+	BUG_ON(desc->fragno > 3);
+
+	page_pos = desc->pos - outbuf->head[0].iov_len;
+	if (page_pos >= 0 && page_pos < outbuf->page_len) {
+		/* pages are not in place: */
+		int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT;
+		in_page = desc->pages[i];
+	} else {
+		in_page = sg_page(sg);
+	}
+	sg_set_page(&desc->infrags[desc->fragno], in_page, sg->length,
+		    sg->offset);
+	sg_set_page(&desc->outfrags[desc->fragno], sg_page(sg), sg->length,
+		    sg->offset);
+	desc->fragno++;
+	desc->fraglen += sg->length;
+	desc->pos += sg->length;
+
+	fraglen = thislen & (crypto_blkcipher_blocksize(desc->desc.tfm) - 1);
+	thislen -= fraglen;
+
+	if (thislen == 0)
+		return 0;
+
+	sg_mark_end(&desc->infrags[desc->fragno - 1]);
+	sg_mark_end(&desc->outfrags[desc->fragno - 1]);
+
+	ret = crypto_blkcipher_encrypt_iv(&desc->desc, desc->outfrags,
+					  desc->infrags, thislen);
+	if (ret)
+		return ret;
+
+	sg_init_table(desc->infrags, 4);
+	sg_init_table(desc->outfrags, 4);
+
+	if (fraglen) {
+		sg_set_page(&desc->outfrags[0], sg_page(sg), fraglen,
+				sg->offset + sg->length - fraglen);
+		desc->infrags[0] = desc->outfrags[0];
+		sg_assign_page(&desc->infrags[0], in_page);
+		desc->fragno = 1;
+		desc->fraglen = fraglen;
+	} else {
+		desc->fragno = 0;
+		desc->fraglen = 0;
+	}
+	return 0;
+}
+
+int
+gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
+		    int offset, struct page **pages)
+{
+	int ret;
+	struct encryptor_desc desc;
+
+	BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
+
+	memset(desc.iv, 0, sizeof(desc.iv));
+	desc.desc.tfm = tfm;
+	desc.desc.info = desc.iv;
+	desc.desc.flags = 0;
+	desc.pos = offset;
+	desc.outbuf = buf;
+	desc.pages = pages;
+	desc.fragno = 0;
+	desc.fraglen = 0;
+
+	sg_init_table(desc.infrags, 4);
+	sg_init_table(desc.outfrags, 4);
+
+	ret = xdr_process_buf(buf, offset, buf->len - offset, encryptor, &desc);
+	return ret;
+}
+
+struct decryptor_desc {
+	u8 iv[GSS_KRB5_MAX_BLOCKSIZE];
+	struct blkcipher_desc desc;
+	struct scatterlist frags[4];
+	int fragno;
+	int fraglen;
+};
+
+static int
+decryptor(struct scatterlist *sg, void *data)
+{
+	struct decryptor_desc *desc = data;
+	int thislen = desc->fraglen + sg->length;
+	int fraglen, ret;
+
+	/* Worst case is 4 fragments: head, end of page 1, start
+	 * of page 2, tail.  Anything more is a bug. */
+	BUG_ON(desc->fragno > 3);
+	sg_set_page(&desc->frags[desc->fragno], sg_page(sg), sg->length,
+		    sg->offset);
+	desc->fragno++;
+	desc->fraglen += sg->length;
+
+	fraglen = thislen & (crypto_blkcipher_blocksize(desc->desc.tfm) - 1);
+	thislen -= fraglen;
+
+	if (thislen == 0)
+		return 0;
+
+	sg_mark_end(&desc->frags[desc->fragno - 1]);
+
+	ret = crypto_blkcipher_decrypt_iv(&desc->desc, desc->frags,
+					  desc->frags, thislen);
+	if (ret)
+		return ret;
+
+	sg_init_table(desc->frags, 4);
+
+	if (fraglen) {
+		sg_set_page(&desc->frags[0], sg_page(sg), fraglen,
+				sg->offset + sg->length - fraglen);
+		desc->fragno = 1;
+		desc->fraglen = fraglen;
+	} else {
+		desc->fragno = 0;
+		desc->fraglen = 0;
+	}
+	return 0;
+}
+
+int
+gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
+		    int offset)
+{
+	struct decryptor_desc desc;
+
+	/* XXXJBF: */
+	BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
+
+	memset(desc.iv, 0, sizeof(desc.iv));
+	desc.desc.tfm = tfm;
+	desc.desc.info = desc.iv;
+	desc.desc.flags = 0;
+	desc.fragno = 0;
+	desc.fraglen = 0;
+
+	sg_init_table(desc.frags, 4);
+
+	return xdr_process_buf(buf, offset, buf->len - offset, decryptor, &desc);
+}
+
+/*
+ * This function makes the assumption that it was ultimately called
+ * from gss_wrap().
+ *
+ * The client auth_gss code moves any existing tail data into a
+ * separate page before calling gss_wrap.
+ * The server svcauth_gss code ensures that both the head and the
+ * tail have slack space of RPC_MAX_AUTH_SIZE before calling gss_wrap.
+ *
+ * Even with that guarantee, this function may be called more than
+ * once in the processing of gss_wrap().  The best we can do is
+ * verify at compile-time (see GSS_KRB5_SLACK_CHECK) that the
+ * largest expected shift will fit within RPC_MAX_AUTH_SIZE.
+ * At run-time we can verify that a single invocation of this
+ * function doesn't attempt to use more the RPC_MAX_AUTH_SIZE.
+ */
+
+int
+xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen)
+{
+	u8 *p;
+
+	if (shiftlen == 0)
+		return 0;
+
+	BUILD_BUG_ON(GSS_KRB5_MAX_SLACK_NEEDED > RPC_MAX_AUTH_SIZE);
+	BUG_ON(shiftlen > RPC_MAX_AUTH_SIZE);
+
+	p = buf->head[0].iov_base + base;
+
+	memmove(p + shiftlen, p, buf->head[0].iov_len - base);
+
+	buf->head[0].iov_len += shiftlen;
+	buf->len += shiftlen;
+
+	return 0;
+}
+
+static u32
+gss_krb5_cts_crypt(struct crypto_blkcipher *cipher, struct xdr_buf *buf,
+		   u32 offset, u8 *iv, struct page **pages, int encrypt)
+{
+	u32 ret;
+	struct scatterlist sg[1];
+	struct blkcipher_desc desc = { .tfm = cipher, .info = iv };
+	u8 data[GSS_KRB5_MAX_BLOCKSIZE * 2];
+	struct page **save_pages;
+	u32 len = buf->len - offset;
+
+	if (len > ARRAY_SIZE(data)) {
+		WARN_ON(0);
+		return -ENOMEM;
+	}
+
+	/*
+	 * For encryption, we want to read from the cleartext
+	 * page cache pages, and write the encrypted data to
+	 * the supplied xdr_buf pages.
+	 */
+	save_pages = buf->pages;
+	if (encrypt)
+		buf->pages = pages;
+
+	ret = read_bytes_from_xdr_buf(buf, offset, data, len);
+	buf->pages = save_pages;
+	if (ret)
+		goto out;
+
+	sg_init_one(sg, data, len);
+
+	if (encrypt)
+		ret = crypto_blkcipher_encrypt_iv(&desc, sg, sg, len);
+	else
+		ret = crypto_blkcipher_decrypt_iv(&desc, sg, sg, len);
+
+	if (ret)
+		goto out;
+
+	ret = write_bytes_to_xdr_buf(buf, offset, data, len);
+
+out:
+	return ret;
+}
+
+u32
+gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
+		     struct xdr_buf *buf, struct page **pages)
+{
+	u32 err;
+	struct xdr_netobj hmac;
+	u8 *cksumkey;
+	u8 *ecptr;
+	struct crypto_blkcipher *cipher, *aux_cipher;
+	int blocksize;
+	struct page **save_pages;
+	int nblocks, nbytes;
+	struct encryptor_desc desc;
+	u32 cbcbytes;
+	unsigned int usage;
+
+	if (kctx->initiate) {
+		cipher = kctx->initiator_enc;
+		aux_cipher = kctx->initiator_enc_aux;
+		cksumkey = kctx->initiator_integ;
+		usage = KG_USAGE_INITIATOR_SEAL;
+	} else {
+		cipher = kctx->acceptor_enc;
+		aux_cipher = kctx->acceptor_enc_aux;
+		cksumkey = kctx->acceptor_integ;
+		usage = KG_USAGE_ACCEPTOR_SEAL;
+	}
+	blocksize = crypto_blkcipher_blocksize(cipher);
+
+	/* hide the gss token header and insert the confounder */
+	offset += GSS_KRB5_TOK_HDR_LEN;
+	if (xdr_extend_head(buf, offset, kctx->gk5e->conflen))
+		return GSS_S_FAILURE;
+	gss_krb5_make_confounder(buf->head[0].iov_base + offset, kctx->gk5e->conflen);
+	offset -= GSS_KRB5_TOK_HDR_LEN;
+
+	if (buf->tail[0].iov_base != NULL) {
+		ecptr = buf->tail[0].iov_base + buf->tail[0].iov_len;
+	} else {
+		buf->tail[0].iov_base = buf->head[0].iov_base
+							+ buf->head[0].iov_len;
+		buf->tail[0].iov_len = 0;
+		ecptr = buf->tail[0].iov_base;
+	}
+
+	/* copy plaintext gss token header after filler (if any) */
+	memcpy(ecptr, buf->head[0].iov_base + offset, GSS_KRB5_TOK_HDR_LEN);
+	buf->tail[0].iov_len += GSS_KRB5_TOK_HDR_LEN;
+	buf->len += GSS_KRB5_TOK_HDR_LEN;
+
+	/* Do the HMAC */
+	hmac.len = GSS_KRB5_MAX_CKSUM_LEN;
+	hmac.data = buf->tail[0].iov_base + buf->tail[0].iov_len;
+
+	/*
+	 * When we are called, pages points to the real page cache
+	 * data -- which we can't go and encrypt!  buf->pages points
+	 * to scratch pages which we are going to send off to the
+	 * client/server.  Swap in the plaintext pages to calculate
+	 * the hmac.
+	 */
+	save_pages = buf->pages;
+	buf->pages = pages;
+
+	err = make_checksum_v2(kctx, NULL, 0, buf,
+			       offset + GSS_KRB5_TOK_HDR_LEN,
+			       cksumkey, usage, &hmac);
+	buf->pages = save_pages;
+	if (err)
+		return GSS_S_FAILURE;
+
+	nbytes = buf->len - offset - GSS_KRB5_TOK_HDR_LEN;
+	nblocks = (nbytes + blocksize - 1) / blocksize;
+	cbcbytes = 0;
+	if (nblocks > 2)
+		cbcbytes = (nblocks - 2) * blocksize;
+
+	memset(desc.iv, 0, sizeof(desc.iv));
+
+	if (cbcbytes) {
+		desc.pos = offset + GSS_KRB5_TOK_HDR_LEN;
+		desc.fragno = 0;
+		desc.fraglen = 0;
+		desc.pages = pages;
+		desc.outbuf = buf;
+		desc.desc.info = desc.iv;
+		desc.desc.flags = 0;
+		desc.desc.tfm = aux_cipher;
+
+		sg_init_table(desc.infrags, 4);
+		sg_init_table(desc.outfrags, 4);
+
+		err = xdr_process_buf(buf, offset + GSS_KRB5_TOK_HDR_LEN,
+				      cbcbytes, encryptor, &desc);
+		if (err)
+			goto out_err;
+	}
+
+	/* Make sure IV carries forward from any CBC results. */
+	err = gss_krb5_cts_crypt(cipher, buf,
+				 offset + GSS_KRB5_TOK_HDR_LEN + cbcbytes,
+				 desc.iv, pages, 1);
+	if (err) {
+		err = GSS_S_FAILURE;
+		goto out_err;
+	}
+
+	/* Now update buf to account for HMAC */
+	buf->tail[0].iov_len += kctx->gk5e->cksumlength;
+	buf->len += kctx->gk5e->cksumlength;
+
+out_err:
+	if (err)
+		err = GSS_S_FAILURE;
+	return err;
+}
+
+u32
+gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
+		     u32 *headskip, u32 *tailskip)
+{
+	struct xdr_buf subbuf;
+	u32 ret = 0;
+	u8 *cksum_key;
+	struct crypto_blkcipher *cipher, *aux_cipher;
+	struct xdr_netobj our_hmac_obj;
+	u8 our_hmac[GSS_KRB5_MAX_CKSUM_LEN];
+	u8 pkt_hmac[GSS_KRB5_MAX_CKSUM_LEN];
+	int nblocks, blocksize, cbcbytes;
+	struct decryptor_desc desc;
+	unsigned int usage;
+
+	if (kctx->initiate) {
+		cipher = kctx->acceptor_enc;
+		aux_cipher = kctx->acceptor_enc_aux;
+		cksum_key = kctx->acceptor_integ;
+		usage = KG_USAGE_ACCEPTOR_SEAL;
+	} else {
+		cipher = kctx->initiator_enc;
+		aux_cipher = kctx->initiator_enc_aux;
+		cksum_key = kctx->initiator_integ;
+		usage = KG_USAGE_INITIATOR_SEAL;
+	}
+	blocksize = crypto_blkcipher_blocksize(cipher);
+
+
+	/* create a segment skipping the header and leaving out the checksum */
+	xdr_buf_subsegment(buf, &subbuf, offset + GSS_KRB5_TOK_HDR_LEN,
+				    (buf->len - offset - GSS_KRB5_TOK_HDR_LEN -
+				     kctx->gk5e->cksumlength));
+
+	nblocks = (subbuf.len + blocksize - 1) / blocksize;
+
+	cbcbytes = 0;
+	if (nblocks > 2)
+		cbcbytes = (nblocks - 2) * blocksize;
+
+	memset(desc.iv, 0, sizeof(desc.iv));
+
+	if (cbcbytes) {
+		desc.fragno = 0;
+		desc.fraglen = 0;
+		desc.desc.info = desc.iv;
+		desc.desc.flags = 0;
+		desc.desc.tfm = aux_cipher;
+
+		sg_init_table(desc.frags, 4);
+
+		ret = xdr_process_buf(&subbuf, 0, cbcbytes, decryptor, &desc);
+		if (ret)
+			goto out_err;
+	}
+
+	/* Make sure IV carries forward from any CBC results. */
+	ret = gss_krb5_cts_crypt(cipher, &subbuf, cbcbytes, desc.iv, NULL, 0);
+	if (ret)
+		goto out_err;
+
+
+	/* Calculate our hmac over the plaintext data */
+	our_hmac_obj.len = sizeof(our_hmac);
+	our_hmac_obj.data = our_hmac;
+
+	ret = make_checksum_v2(kctx, NULL, 0, &subbuf, 0,
+			       cksum_key, usage, &our_hmac_obj);
+	if (ret)
+		goto out_err;
+
+	/* Get the packet's hmac value */
+	ret = read_bytes_from_xdr_buf(buf, buf->len - kctx->gk5e->cksumlength,
+				      pkt_hmac, kctx->gk5e->cksumlength);
+	if (ret)
+		goto out_err;
+
+	if (memcmp(pkt_hmac, our_hmac, kctx->gk5e->cksumlength) != 0) {
+		ret = GSS_S_BAD_SIG;
+		goto out_err;
+	}
+	*headskip = kctx->gk5e->conflen;
+	*tailskip = kctx->gk5e->cksumlength;
+out_err:
+	if (ret && ret != GSS_S_BAD_SIG)
+		ret = GSS_S_FAILURE;
+	return ret;
+}
+
+/*
+ * Compute Kseq given the initial session key and the checksum.
+ * Set the key of the given cipher.
+ */
+int
+krb5_rc4_setup_seq_key(struct krb5_ctx *kctx, struct crypto_blkcipher *cipher,
+		       unsigned char *cksum)
+{
+	struct crypto_hash *hmac;
+	struct hash_desc desc;
+	struct scatterlist sg[1];
+	u8 Kseq[GSS_KRB5_MAX_KEYLEN];
+	u32 zeroconstant = 0;
+	int err;
+
+	dprintk("%s: entered\n", __func__);
+
+	hmac = crypto_alloc_hash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(hmac)) {
+		dprintk("%s: error %ld, allocating hash '%s'\n",
+			__func__, PTR_ERR(hmac), kctx->gk5e->cksum_name);
+		return PTR_ERR(hmac);
+	}
+
+	desc.tfm = hmac;
+	desc.flags = 0;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out_err;
+
+	/* Compute intermediate Kseq from session key */
+	err = crypto_hash_setkey(hmac, kctx->Ksess, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	sg_init_table(sg, 1);
+	sg_set_buf(sg, &zeroconstant, 4);
+
+	err = crypto_hash_digest(&desc, sg, 4, Kseq);
+	if (err)
+		goto out_err;
+
+	/* Compute final Kseq from the checksum and intermediate Kseq */
+	err = crypto_hash_setkey(hmac, Kseq, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	sg_set_buf(sg, cksum, 8);
+
+	err = crypto_hash_digest(&desc, sg, 8, Kseq);
+	if (err)
+		goto out_err;
+
+	err = crypto_blkcipher_setkey(cipher, Kseq, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	err = 0;
+
+out_err:
+	crypto_free_hash(hmac);
+	dprintk("%s: returning %d\n", __func__, err);
+	return err;
+}
+
+/*
+ * Compute Kcrypt given the initial session key and the plaintext seqnum.
+ * Set the key of cipher kctx->enc.
+ */
+int
+krb5_rc4_setup_enc_key(struct krb5_ctx *kctx, struct crypto_blkcipher *cipher,
+		       s32 seqnum)
+{
+	struct crypto_hash *hmac;
+	struct hash_desc desc;
+	struct scatterlist sg[1];
+	u8 Kcrypt[GSS_KRB5_MAX_KEYLEN];
+	u8 zeroconstant[4] = {0};
+	u8 seqnumarray[4];
+	int err, i;
+
+	dprintk("%s: entered, seqnum %u\n", __func__, seqnum);
+
+	hmac = crypto_alloc_hash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(hmac)) {
+		dprintk("%s: error %ld, allocating hash '%s'\n",
+			__func__, PTR_ERR(hmac), kctx->gk5e->cksum_name);
+		return PTR_ERR(hmac);
+	}
+
+	desc.tfm = hmac;
+	desc.flags = 0;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out_err;
+
+	/* Compute intermediate Kcrypt from session key */
+	for (i = 0; i < kctx->gk5e->keylength; i++)
+		Kcrypt[i] = kctx->Ksess[i] ^ 0xf0;
+
+	err = crypto_hash_setkey(hmac, Kcrypt, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	sg_init_table(sg, 1);
+	sg_set_buf(sg, zeroconstant, 4);
+
+	err = crypto_hash_digest(&desc, sg, 4, Kcrypt);
+	if (err)
+		goto out_err;
+
+	/* Compute final Kcrypt from the seqnum and intermediate Kcrypt */
+	err = crypto_hash_setkey(hmac, Kcrypt, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	seqnumarray[0] = (unsigned char) ((seqnum >> 24) & 0xff);
+	seqnumarray[1] = (unsigned char) ((seqnum >> 16) & 0xff);
+	seqnumarray[2] = (unsigned char) ((seqnum >> 8) & 0xff);
+	seqnumarray[3] = (unsigned char) ((seqnum >> 0) & 0xff);
+
+	sg_set_buf(sg, seqnumarray, 4);
+
+	err = crypto_hash_digest(&desc, sg, 4, Kcrypt);
+	if (err)
+		goto out_err;
+
+	err = crypto_blkcipher_setkey(cipher, Kcrypt, kctx->gk5e->keylength);
+	if (err)
+		goto out_err;
+
+	err = 0;
+
+out_err:
+	crypto_free_hash(hmac);
+	dprintk("%s: returning %d\n", __func__, err);
+	return err;
+}
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_keys.c b/kernel/net/sunrpc/auth_gss/gss_krb5_keys.c
new file mode 100644
index 000000000..234fa8d0f
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_keys.c
@@ -0,0 +1,327 @@
+/*
+ * COPYRIGHT (c) 2008
+ * The Regents of the University of Michigan
+ * ALL RIGHTS RESERVED
+ *
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization.  If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may require
+ * a specific license from the United States Government.  It is the
+ * responsibility of any person or organization contemplating export to
+ * obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/lcm.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+/*
+ * This is the n-fold function as described in rfc3961, sec 5.1
+ * Taken from MIT Kerberos and modified.
+ */
+
+static void krb5_nfold(u32 inbits, const u8 *in,
+		       u32 outbits, u8 *out)
+{
+	unsigned long ulcm;
+	int byte, i, msbit;
+
+	/* the code below is more readable if I make these bytes
+	   instead of bits */
+
+	inbits >>= 3;
+	outbits >>= 3;
+
+	/* first compute lcm(n,k) */
+	ulcm = lcm(inbits, outbits);
+
+	/* now do the real work */
+
+	memset(out, 0, outbits);
+	byte = 0;
+
+	/* this will end up cycling through k lcm(k,n)/k times, which
+	   is correct */
+	for (i = ulcm-1; i >= 0; i--) {
+		/* compute the msbit in k which gets added into this byte */
+		msbit = (
+			/* first, start with the msbit in the first,
+			 * unrotated byte */
+			 ((inbits << 3) - 1)
+			 /* then, for each byte, shift to the right
+			  * for each repetition */
+			 + (((inbits << 3) + 13) * (i/inbits))
+			 /* last, pick out the correct byte within
+			  * that shifted repetition */
+			 + ((inbits - (i % inbits)) << 3)
+			 ) % (inbits << 3);
+
+		/* pull out the byte value itself */
+		byte += (((in[((inbits - 1) - (msbit >> 3)) % inbits] << 8)|
+				  (in[((inbits) - (msbit >> 3)) % inbits]))
+				 >> ((msbit & 7) + 1)) & 0xff;
+
+		/* do the addition */
+		byte += out[i % outbits];
+		out[i % outbits] = byte & 0xff;
+
+		/* keep around the carry bit, if any */
+		byte >>= 8;
+
+	}
+
+	/* if there's a carry bit left over, add it back in */
+	if (byte) {
+		for (i = outbits - 1; i >= 0; i--) {
+			/* do the addition */
+			byte += out[i];
+			out[i] = byte & 0xff;
+
+			/* keep around the carry bit, if any */
+			byte >>= 8;
+		}
+	}
+}
+
+/*
+ * This is the DK (derive_key) function as described in rfc3961, sec 5.1
+ * Taken from MIT Kerberos and modified.
+ */
+
+u32 krb5_derive_key(const struct gss_krb5_enctype *gk5e,
+		    const struct xdr_netobj *inkey,
+		    struct xdr_netobj *outkey,
+		    const struct xdr_netobj *in_constant,
+		    gfp_t gfp_mask)
+{
+	size_t blocksize, keybytes, keylength, n;
+	unsigned char *inblockdata, *outblockdata, *rawkey;
+	struct xdr_netobj inblock, outblock;
+	struct crypto_blkcipher *cipher;
+	u32 ret = EINVAL;
+
+	blocksize = gk5e->blocksize;
+	keybytes = gk5e->keybytes;
+	keylength = gk5e->keylength;
+
+	if ((inkey->len != keylength) || (outkey->len != keylength))
+		goto err_return;
+
+	cipher = crypto_alloc_blkcipher(gk5e->encrypt_name, 0,
+					CRYPTO_ALG_ASYNC);
+	if (IS_ERR(cipher))
+		goto err_return;
+	if (crypto_blkcipher_setkey(cipher, inkey->data, inkey->len))
+		goto err_return;
+
+	/* allocate and set up buffers */
+
+	ret = ENOMEM;
+	inblockdata = kmalloc(blocksize, gfp_mask);
+	if (inblockdata == NULL)
+		goto err_free_cipher;
+
+	outblockdata = kmalloc(blocksize, gfp_mask);
+	if (outblockdata == NULL)
+		goto err_free_in;
+
+	rawkey = kmalloc(keybytes, gfp_mask);
+	if (rawkey == NULL)
+		goto err_free_out;
+
+	inblock.data = (char *) inblockdata;
+	inblock.len = blocksize;
+
+	outblock.data = (char *) outblockdata;
+	outblock.len = blocksize;
+
+	/* initialize the input block */
+
+	if (in_constant->len == inblock.len) {
+		memcpy(inblock.data, in_constant->data, inblock.len);
+	} else {
+		krb5_nfold(in_constant->len * 8, in_constant->data,
+			   inblock.len * 8, inblock.data);
+	}
+
+	/* loop encrypting the blocks until enough key bytes are generated */
+
+	n = 0;
+	while (n < keybytes) {
+		(*(gk5e->encrypt))(cipher, NULL, inblock.data,
+				   outblock.data, inblock.len);
+
+		if ((keybytes - n) <= outblock.len) {
+			memcpy(rawkey + n, outblock.data, (keybytes - n));
+			break;
+		}
+
+		memcpy(rawkey + n, outblock.data, outblock.len);
+		memcpy(inblock.data, outblock.data, outblock.len);
+		n += outblock.len;
+	}
+
+	/* postprocess the key */
+
+	inblock.data = (char *) rawkey;
+	inblock.len = keybytes;
+
+	BUG_ON(gk5e->mk_key == NULL);
+	ret = (*(gk5e->mk_key))(gk5e, &inblock, outkey);
+	if (ret) {
+		dprintk("%s: got %d from mk_key function for '%s'\n",
+			__func__, ret, gk5e->encrypt_name);
+		goto err_free_raw;
+	}
+
+	/* clean memory, free resources and exit */
+
+	ret = 0;
+
+err_free_raw:
+	memset(rawkey, 0, keybytes);
+	kfree(rawkey);
+err_free_out:
+	memset(outblockdata, 0, blocksize);
+	kfree(outblockdata);
+err_free_in:
+	memset(inblockdata, 0, blocksize);
+	kfree(inblockdata);
+err_free_cipher:
+	crypto_free_blkcipher(cipher);
+err_return:
+	return ret;
+}
+
+#define smask(step) ((1<<step)-1)
+#define pstep(x, step) (((x)&smask(step))^(((x)>>step)&smask(step)))
+#define parity_char(x) pstep(pstep(pstep((x), 4), 2), 1)
+
+static void mit_des_fixup_key_parity(u8 key[8])
+{
+	int i;
+	for (i = 0; i < 8; i++) {
+		key[i] &= 0xfe;
+		key[i] |= 1^parity_char(key[i]);
+	}
+}
+
+/*
+ * This is the des3 key derivation postprocess function
+ */
+u32 gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
+			   struct xdr_netobj *randombits,
+			   struct xdr_netobj *key)
+{
+	int i;
+	u32 ret = EINVAL;
+
+	if (key->len != 24) {
+		dprintk("%s: key->len is %d\n", __func__, key->len);
+		goto err_out;
+	}
+	if (randombits->len != 21) {
+		dprintk("%s: randombits->len is %d\n",
+			__func__, randombits->len);
+		goto err_out;
+	}
+
+	/* take the seven bytes, move them around into the top 7 bits of the
+	   8 key bytes, then compute the parity bits.  Do this three times. */
+
+	for (i = 0; i < 3; i++) {
+		memcpy(key->data + i*8, randombits->data + i*7, 7);
+		key->data[i*8+7] = (((key->data[i*8]&1)<<1) |
+				    ((key->data[i*8+1]&1)<<2) |
+				    ((key->data[i*8+2]&1)<<3) |
+				    ((key->data[i*8+3]&1)<<4) |
+				    ((key->data[i*8+4]&1)<<5) |
+				    ((key->data[i*8+5]&1)<<6) |
+				    ((key->data[i*8+6]&1)<<7));
+
+		mit_des_fixup_key_parity(key->data + i*8);
+	}
+	ret = 0;
+err_out:
+	return ret;
+}
+
+/*
+ * This is the aes key derivation postprocess function
+ */
+u32 gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
+			  struct xdr_netobj *randombits,
+			  struct xdr_netobj *key)
+{
+	u32 ret = EINVAL;
+
+	if (key->len != 16 && key->len != 32) {
+		dprintk("%s: key->len is %d\n", __func__, key->len);
+		goto err_out;
+	}
+	if (randombits->len != 16 && randombits->len != 32) {
+		dprintk("%s: randombits->len is %d\n",
+			__func__, randombits->len);
+		goto err_out;
+	}
+	if (randombits->len != key->len) {
+		dprintk("%s: randombits->len is %d, key->len is %d\n",
+			__func__, randombits->len, key->len);
+		goto err_out;
+	}
+	memcpy(key->data, randombits->data, key->len);
+	ret = 0;
+err_out:
+	return ret;
+}
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_mech.c b/kernel/net/sunrpc/auth_gss/gss_krb5_mech.c
new file mode 100644
index 000000000..28db442a0
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -0,0 +1,788 @@
+/*
+ *  linux/net/sunrpc/gss_krb5_mech.c
+ *
+ *  Copyright (c) 2001-2008 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson <andros@umich.edu>
+ *  J. Bruce Fields <bfields@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/crypto.h>
+#include <linux/sunrpc/gss_krb5_enctypes.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+static struct gss_api_mech gss_kerberos_mech;	/* forward declaration */
+
+static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
+	/*
+	 * DES (All DES enctypes are mapped to the same gss functionality)
+	 */
+	{
+	  .etype = ENCTYPE_DES_CBC_RAW,
+	  .ctype = CKSUMTYPE_RSA_MD5,
+	  .name = "des-cbc-crc",
+	  .encrypt_name = "cbc(des)",
+	  .cksum_name = "md5",
+	  .encrypt = krb5_encrypt,
+	  .decrypt = krb5_decrypt,
+	  .mk_key = NULL,
+	  .signalg = SGN_ALG_DES_MAC_MD5,
+	  .sealalg = SEAL_ALG_DES,
+	  .keybytes = 7,
+	  .keylength = 8,
+	  .blocksize = 8,
+	  .conflen = 8,
+	  .cksumlength = 8,
+	  .keyed_cksum = 0,
+	},
+	/*
+	 * RC4-HMAC
+	 */
+	{
+	  .etype = ENCTYPE_ARCFOUR_HMAC,
+	  .ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
+	  .name = "rc4-hmac",
+	  .encrypt_name = "ecb(arc4)",
+	  .cksum_name = "hmac(md5)",
+	  .encrypt = krb5_encrypt,
+	  .decrypt = krb5_decrypt,
+	  .mk_key = NULL,
+	  .signalg = SGN_ALG_HMAC_MD5,
+	  .sealalg = SEAL_ALG_MICROSOFT_RC4,
+	  .keybytes = 16,
+	  .keylength = 16,
+	  .blocksize = 1,
+	  .conflen = 8,
+	  .cksumlength = 8,
+	  .keyed_cksum = 1,
+	},
+	/*
+	 * 3DES
+	 */
+	{
+	  .etype = ENCTYPE_DES3_CBC_RAW,
+	  .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
+	  .name = "des3-hmac-sha1",
+	  .encrypt_name = "cbc(des3_ede)",
+	  .cksum_name = "hmac(sha1)",
+	  .encrypt = krb5_encrypt,
+	  .decrypt = krb5_decrypt,
+	  .mk_key = gss_krb5_des3_make_key,
+	  .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
+	  .sealalg = SEAL_ALG_DES3KD,
+	  .keybytes = 21,
+	  .keylength = 24,
+	  .blocksize = 8,
+	  .conflen = 8,
+	  .cksumlength = 20,
+	  .keyed_cksum = 1,
+	},
+	/*
+	 * AES128
+	 */
+	{
+	  .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+	  .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
+	  .name = "aes128-cts",
+	  .encrypt_name = "cts(cbc(aes))",
+	  .cksum_name = "hmac(sha1)",
+	  .encrypt = krb5_encrypt,
+	  .decrypt = krb5_decrypt,
+	  .mk_key = gss_krb5_aes_make_key,
+	  .encrypt_v2 = gss_krb5_aes_encrypt,
+	  .decrypt_v2 = gss_krb5_aes_decrypt,
+	  .signalg = -1,
+	  .sealalg = -1,
+	  .keybytes = 16,
+	  .keylength = 16,
+	  .blocksize = 16,
+	  .conflen = 16,
+	  .cksumlength = 12,
+	  .keyed_cksum = 1,
+	},
+	/*
+	 * AES256
+	 */
+	{
+	  .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+	  .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
+	  .name = "aes256-cts",
+	  .encrypt_name = "cts(cbc(aes))",
+	  .cksum_name = "hmac(sha1)",
+	  .encrypt = krb5_encrypt,
+	  .decrypt = krb5_decrypt,
+	  .mk_key = gss_krb5_aes_make_key,
+	  .encrypt_v2 = gss_krb5_aes_encrypt,
+	  .decrypt_v2 = gss_krb5_aes_decrypt,
+	  .signalg = -1,
+	  .sealalg = -1,
+	  .keybytes = 32,
+	  .keylength = 32,
+	  .blocksize = 16,
+	  .conflen = 16,
+	  .cksumlength = 12,
+	  .keyed_cksum = 1,
+	},
+};
+
+static const int num_supported_enctypes =
+	ARRAY_SIZE(supported_gss_krb5_enctypes);
+
+static int
+supported_gss_krb5_enctype(int etype)
+{
+	int i;
+	for (i = 0; i < num_supported_enctypes; i++)
+		if (supported_gss_krb5_enctypes[i].etype == etype)
+			return 1;
+	return 0;
+}
+
+static const struct gss_krb5_enctype *
+get_gss_krb5_enctype(int etype)
+{
+	int i;
+	for (i = 0; i < num_supported_enctypes; i++)
+		if (supported_gss_krb5_enctypes[i].etype == etype)
+			return &supported_gss_krb5_enctypes[i];
+	return NULL;
+}
+
+static const void *
+simple_get_bytes(const void *p, const void *end, void *res, int len)
+{
+	const void *q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	memcpy(res, p, len);
+	return q;
+}
+
+static const void *
+simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
+{
+	const void *q;
+	unsigned int len;
+
+	p = simple_get_bytes(p, end, &len, sizeof(len));
+	if (IS_ERR(p))
+		return p;
+	q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	res->data = kmemdup(p, len, GFP_NOFS);
+	if (unlikely(res->data == NULL))
+		return ERR_PTR(-ENOMEM);
+	res->len = len;
+	return q;
+}
+
+static inline const void *
+get_key(const void *p, const void *end,
+	struct krb5_ctx *ctx, struct crypto_blkcipher **res)
+{
+	struct xdr_netobj	key;
+	int			alg;
+
+	p = simple_get_bytes(p, end, &alg, sizeof(alg));
+	if (IS_ERR(p))
+		goto out_err;
+
+	switch (alg) {
+	case ENCTYPE_DES_CBC_CRC:
+	case ENCTYPE_DES_CBC_MD4:
+	case ENCTYPE_DES_CBC_MD5:
+		/* Map all these key types to ENCTYPE_DES_CBC_RAW */
+		alg = ENCTYPE_DES_CBC_RAW;
+		break;
+	}
+
+	if (!supported_gss_krb5_enctype(alg)) {
+		printk(KERN_WARNING "gss_kerberos_mech: unsupported "
+			"encryption key algorithm %d\n", alg);
+		p = ERR_PTR(-EINVAL);
+		goto out_err;
+	}
+	p = simple_get_netobj(p, end, &key);
+	if (IS_ERR(p))
+		goto out_err;
+
+	*res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+							CRYPTO_ALG_ASYNC);
+	if (IS_ERR(*res)) {
+		printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
+			"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+		*res = NULL;
+		goto out_err_free_key;
+	}
+	if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
+		printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
+			"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+		goto out_err_free_tfm;
+	}
+
+	kfree(key.data);
+	return p;
+
+out_err_free_tfm:
+	crypto_free_blkcipher(*res);
+out_err_free_key:
+	kfree(key.data);
+	p = ERR_PTR(-EINVAL);
+out_err:
+	return p;
+}
+
+static int
+gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
+{
+	int tmp;
+
+	p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
+	if (IS_ERR(p))
+		goto out_err;
+
+	/* Old format supports only DES!  Any other enctype uses new format */
+	ctx->enctype = ENCTYPE_DES_CBC_RAW;
+
+	ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
+	if (ctx->gk5e == NULL) {
+		p = ERR_PTR(-EINVAL);
+		goto out_err;
+	}
+
+	/* The downcall format was designed before we completely understood
+	 * the uses of the context fields; so it includes some stuff we
+	 * just give some minimal sanity-checking, and some we ignore
+	 * completely (like the next twenty bytes): */
+	if (unlikely(p + 20 > end || p + 20 < p)) {
+		p = ERR_PTR(-EFAULT);
+		goto out_err;
+	}
+	p += 20;
+	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
+	if (IS_ERR(p))
+		goto out_err;
+	if (tmp != SGN_ALG_DES_MAC_MD5) {
+		p = ERR_PTR(-ENOSYS);
+		goto out_err;
+	}
+	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
+	if (IS_ERR(p))
+		goto out_err;
+	if (tmp != SEAL_ALG_DES) {
+		p = ERR_PTR(-ENOSYS);
+		goto out_err;
+	}
+	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
+	if (IS_ERR(p))
+		goto out_err;
+	p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
+	if (IS_ERR(p))
+		goto out_err;
+	p = simple_get_netobj(p, end, &ctx->mech_used);
+	if (IS_ERR(p))
+		goto out_err;
+	p = get_key(p, end, ctx, &ctx->enc);
+	if (IS_ERR(p))
+		goto out_err_free_mech;
+	p = get_key(p, end, ctx, &ctx->seq);
+	if (IS_ERR(p))
+		goto out_err_free_key1;
+	if (p != end) {
+		p = ERR_PTR(-EFAULT);
+		goto out_err_free_key2;
+	}
+
+	return 0;
+
+out_err_free_key2:
+	crypto_free_blkcipher(ctx->seq);
+out_err_free_key1:
+	crypto_free_blkcipher(ctx->enc);
+out_err_free_mech:
+	kfree(ctx->mech_used.data);
+out_err:
+	return PTR_ERR(p);
+}
+
+static struct crypto_blkcipher *
+context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
+{
+	struct crypto_blkcipher *cp;
+
+	cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(cp)) {
+		dprintk("gss_kerberos_mech: unable to initialize "
+			"crypto algorithm %s\n", cname);
+		return NULL;
+	}
+	if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
+		dprintk("gss_kerberos_mech: error setting key for "
+			"crypto algorithm %s\n", cname);
+		crypto_free_blkcipher(cp);
+		return NULL;
+	}
+	return cp;
+}
+
+static inline void
+set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
+{
+	cdata[0] = (usage>>24)&0xff;
+	cdata[1] = (usage>>16)&0xff;
+	cdata[2] = (usage>>8)&0xff;
+	cdata[3] = usage&0xff;
+	cdata[4] = seed;
+}
+
+static int
+context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
+{
+	struct xdr_netobj c, keyin, keyout;
+	u8 cdata[GSS_KRB5_K5CLENGTH];
+	u32 err;
+
+	c.len = GSS_KRB5_K5CLENGTH;
+	c.data = cdata;
+
+	keyin.data = ctx->Ksess;
+	keyin.len = ctx->gk5e->keylength;
+	keyout.len = ctx->gk5e->keylength;
+
+	/* seq uses the raw key */
+	ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
+					   ctx->Ksess);
+	if (ctx->seq == NULL)
+		goto out_err;
+
+	ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
+					   ctx->Ksess);
+	if (ctx->enc == NULL)
+		goto out_free_seq;
+
+	/* derive cksum */
+	set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
+	keyout.data = ctx->cksum;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving cksum key\n",
+			__func__, err);
+		goto out_free_enc;
+	}
+
+	return 0;
+
+out_free_enc:
+	crypto_free_blkcipher(ctx->enc);
+out_free_seq:
+	crypto_free_blkcipher(ctx->seq);
+out_err:
+	return -EINVAL;
+}
+
+/*
+ * Note that RC4 depends on deriving keys using the sequence
+ * number or the checksum of a token.  Therefore, the final keys
+ * cannot be calculated until the token is being constructed!
+ */
+static int
+context_derive_keys_rc4(struct krb5_ctx *ctx)
+{
+	struct crypto_hash *hmac;
+	char sigkeyconstant[] = "signaturekey";
+	int slen = strlen(sigkeyconstant) + 1;	/* include null terminator */
+	struct hash_desc desc;
+	struct scatterlist sg[1];
+	int err;
+
+	dprintk("RPC:       %s: entered\n", __func__);
+	/*
+	 * derive cksum (aka Ksign) key
+	 */
+	hmac = crypto_alloc_hash(ctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(hmac)) {
+		dprintk("%s: error %ld allocating hash '%s'\n",
+			__func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
+		err = PTR_ERR(hmac);
+		goto out_err;
+	}
+
+	err = crypto_hash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
+	if (err)
+		goto out_err_free_hmac;
+
+	sg_init_table(sg, 1);
+	sg_set_buf(sg, sigkeyconstant, slen);
+
+	desc.tfm = hmac;
+	desc.flags = 0;
+
+	err = crypto_hash_init(&desc);
+	if (err)
+		goto out_err_free_hmac;
+
+	err = crypto_hash_digest(&desc, sg, slen, ctx->cksum);
+	if (err)
+		goto out_err_free_hmac;
+	/*
+	 * allocate hash, and blkciphers for data and seqnum encryption
+	 */
+	ctx->enc = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+					  CRYPTO_ALG_ASYNC);
+	if (IS_ERR(ctx->enc)) {
+		err = PTR_ERR(ctx->enc);
+		goto out_err_free_hmac;
+	}
+
+	ctx->seq = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+					  CRYPTO_ALG_ASYNC);
+	if (IS_ERR(ctx->seq)) {
+		crypto_free_blkcipher(ctx->enc);
+		err = PTR_ERR(ctx->seq);
+		goto out_err_free_hmac;
+	}
+
+	dprintk("RPC:       %s: returning success\n", __func__);
+
+	err = 0;
+
+out_err_free_hmac:
+	crypto_free_hash(hmac);
+out_err:
+	dprintk("RPC:       %s: returning %d\n", __func__, err);
+	return err;
+}
+
+static int
+context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
+{
+	struct xdr_netobj c, keyin, keyout;
+	u8 cdata[GSS_KRB5_K5CLENGTH];
+	u32 err;
+
+	c.len = GSS_KRB5_K5CLENGTH;
+	c.data = cdata;
+
+	keyin.data = ctx->Ksess;
+	keyin.len = ctx->gk5e->keylength;
+	keyout.len = ctx->gk5e->keylength;
+
+	/* initiator seal encryption */
+	set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
+	keyout.data = ctx->initiator_seal;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving initiator_seal key\n",
+			__func__, err);
+		goto out_err;
+	}
+	ctx->initiator_enc = context_v2_alloc_cipher(ctx,
+						     ctx->gk5e->encrypt_name,
+						     ctx->initiator_seal);
+	if (ctx->initiator_enc == NULL)
+		goto out_err;
+
+	/* acceptor seal encryption */
+	set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
+	keyout.data = ctx->acceptor_seal;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving acceptor_seal key\n",
+			__func__, err);
+		goto out_free_initiator_enc;
+	}
+	ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
+						    ctx->gk5e->encrypt_name,
+						    ctx->acceptor_seal);
+	if (ctx->acceptor_enc == NULL)
+		goto out_free_initiator_enc;
+
+	/* initiator sign checksum */
+	set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
+	keyout.data = ctx->initiator_sign;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving initiator_sign key\n",
+			__func__, err);
+		goto out_free_acceptor_enc;
+	}
+
+	/* acceptor sign checksum */
+	set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
+	keyout.data = ctx->acceptor_sign;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving acceptor_sign key\n",
+			__func__, err);
+		goto out_free_acceptor_enc;
+	}
+
+	/* initiator seal integrity */
+	set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
+	keyout.data = ctx->initiator_integ;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving initiator_integ key\n",
+			__func__, err);
+		goto out_free_acceptor_enc;
+	}
+
+	/* acceptor seal integrity */
+	set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
+	keyout.data = ctx->acceptor_integ;
+	err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+	if (err) {
+		dprintk("%s: Error %d deriving acceptor_integ key\n",
+			__func__, err);
+		goto out_free_acceptor_enc;
+	}
+
+	switch (ctx->enctype) {
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		ctx->initiator_enc_aux =
+			context_v2_alloc_cipher(ctx, "cbc(aes)",
+						ctx->initiator_seal);
+		if (ctx->initiator_enc_aux == NULL)
+			goto out_free_acceptor_enc;
+		ctx->acceptor_enc_aux =
+			context_v2_alloc_cipher(ctx, "cbc(aes)",
+						ctx->acceptor_seal);
+		if (ctx->acceptor_enc_aux == NULL) {
+			crypto_free_blkcipher(ctx->initiator_enc_aux);
+			goto out_free_acceptor_enc;
+		}
+	}
+
+	return 0;
+
+out_free_acceptor_enc:
+	crypto_free_blkcipher(ctx->acceptor_enc);
+out_free_initiator_enc:
+	crypto_free_blkcipher(ctx->initiator_enc);
+out_err:
+	return -EINVAL;
+}
+
+static int
+gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
+		gfp_t gfp_mask)
+{
+	int keylen;
+
+	p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
+	if (IS_ERR(p))
+		goto out_err;
+	ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
+
+	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
+	if (IS_ERR(p))
+		goto out_err;
+	p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
+	if (IS_ERR(p))
+		goto out_err;
+	/* set seq_send for use by "older" enctypes */
+	ctx->seq_send = ctx->seq_send64;
+	if (ctx->seq_send64 != ctx->seq_send) {
+		dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
+			(unsigned long)ctx->seq_send64, ctx->seq_send);
+		p = ERR_PTR(-EINVAL);
+		goto out_err;
+	}
+	p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
+	if (IS_ERR(p))
+		goto out_err;
+	/* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
+	if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
+		ctx->enctype = ENCTYPE_DES3_CBC_RAW;
+	ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
+	if (ctx->gk5e == NULL) {
+		dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
+			ctx->enctype);
+		p = ERR_PTR(-EINVAL);
+		goto out_err;
+	}
+	keylen = ctx->gk5e->keylength;
+
+	p = simple_get_bytes(p, end, ctx->Ksess, keylen);
+	if (IS_ERR(p))
+		goto out_err;
+
+	if (p != end) {
+		p = ERR_PTR(-EINVAL);
+		goto out_err;
+	}
+
+	ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
+				      gss_kerberos_mech.gm_oid.len, gfp_mask);
+	if (unlikely(ctx->mech_used.data == NULL)) {
+		p = ERR_PTR(-ENOMEM);
+		goto out_err;
+	}
+	ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
+
+	switch (ctx->enctype) {
+	case ENCTYPE_DES3_CBC_RAW:
+		return context_derive_keys_des3(ctx, gfp_mask);
+	case ENCTYPE_ARCFOUR_HMAC:
+		return context_derive_keys_rc4(ctx);
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		return context_derive_keys_new(ctx, gfp_mask);
+	default:
+		return -EINVAL;
+	}
+
+out_err:
+	return PTR_ERR(p);
+}
+
+static int
+gss_import_sec_context_kerberos(const void *p, size_t len,
+				struct gss_ctx *ctx_id,
+				time_t *endtime,
+				gfp_t gfp_mask)
+{
+	const void *end = (const void *)((const char *)p + len);
+	struct  krb5_ctx *ctx;
+	int ret;
+
+	ctx = kzalloc(sizeof(*ctx), gfp_mask);
+	if (ctx == NULL)
+		return -ENOMEM;
+
+	if (len == 85)
+		ret = gss_import_v1_context(p, end, ctx);
+	else
+		ret = gss_import_v2_context(p, end, ctx, gfp_mask);
+
+	if (ret == 0) {
+		ctx_id->internal_ctx_id = ctx;
+		if (endtime)
+			*endtime = ctx->endtime;
+	} else
+		kfree(ctx);
+
+	dprintk("RPC:       %s: returning %d\n", __func__, ret);
+	return ret;
+}
+
+static void
+gss_delete_sec_context_kerberos(void *internal_ctx) {
+	struct krb5_ctx *kctx = internal_ctx;
+
+	crypto_free_blkcipher(kctx->seq);
+	crypto_free_blkcipher(kctx->enc);
+	crypto_free_blkcipher(kctx->acceptor_enc);
+	crypto_free_blkcipher(kctx->initiator_enc);
+	crypto_free_blkcipher(kctx->acceptor_enc_aux);
+	crypto_free_blkcipher(kctx->initiator_enc_aux);
+	kfree(kctx->mech_used.data);
+	kfree(kctx);
+}
+
+static const struct gss_api_ops gss_kerberos_ops = {
+	.gss_import_sec_context	= gss_import_sec_context_kerberos,
+	.gss_get_mic		= gss_get_mic_kerberos,
+	.gss_verify_mic		= gss_verify_mic_kerberos,
+	.gss_wrap		= gss_wrap_kerberos,
+	.gss_unwrap		= gss_unwrap_kerberos,
+	.gss_delete_sec_context	= gss_delete_sec_context_kerberos,
+};
+
+static struct pf_desc gss_kerberos_pfs[] = {
+	[0] = {
+		.pseudoflavor = RPC_AUTH_GSS_KRB5,
+		.qop = GSS_C_QOP_DEFAULT,
+		.service = RPC_GSS_SVC_NONE,
+		.name = "krb5",
+	},
+	[1] = {
+		.pseudoflavor = RPC_AUTH_GSS_KRB5I,
+		.qop = GSS_C_QOP_DEFAULT,
+		.service = RPC_GSS_SVC_INTEGRITY,
+		.name = "krb5i",
+	},
+	[2] = {
+		.pseudoflavor = RPC_AUTH_GSS_KRB5P,
+		.qop = GSS_C_QOP_DEFAULT,
+		.service = RPC_GSS_SVC_PRIVACY,
+		.name = "krb5p",
+	},
+};
+
+MODULE_ALIAS("rpc-auth-gss-krb5");
+MODULE_ALIAS("rpc-auth-gss-krb5i");
+MODULE_ALIAS("rpc-auth-gss-krb5p");
+MODULE_ALIAS("rpc-auth-gss-390003");
+MODULE_ALIAS("rpc-auth-gss-390004");
+MODULE_ALIAS("rpc-auth-gss-390005");
+MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
+
+static struct gss_api_mech gss_kerberos_mech = {
+	.gm_name	= "krb5",
+	.gm_owner	= THIS_MODULE,
+	.gm_oid		= { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
+	.gm_ops		= &gss_kerberos_ops,
+	.gm_pf_num	= ARRAY_SIZE(gss_kerberos_pfs),
+	.gm_pfs		= gss_kerberos_pfs,
+	.gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
+};
+
+static int __init init_kerberos_module(void)
+{
+	int status;
+
+	status = gss_mech_register(&gss_kerberos_mech);
+	if (status)
+		printk("Failed to register kerberos gss mechanism!\n");
+	return status;
+}
+
+static void __exit cleanup_kerberos_module(void)
+{
+	gss_mech_unregister(&gss_kerberos_mech);
+}
+
+MODULE_LICENSE("GPL");
+module_init(init_kerberos_module);
+module_exit(cleanup_kerberos_module);
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_seal.c b/kernel/net/sunrpc/auth_gss/gss_krb5_seal.c
new file mode 100644
index 000000000..1d74d653e
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -0,0 +1,229 @@
+/*
+ *  linux/net/sunrpc/gss_krb5_seal.c
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
+ *
+ *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson	<andros@umich.edu>
+ *  J. Bruce Fields	<bfields@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may require
+ * a specific license from the United States Government.  It is the
+ * responsibility of any person or organization contemplating export to
+ * obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/types.h>
+#include <linux/jiffies.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/random.h>
+#include <linux/crypto.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+DEFINE_SPINLOCK(krb5_seq_lock);
+
+static void *
+setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token)
+{
+	u16 *ptr;
+	void *krb5_hdr;
+	int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
+
+	token->len = g_token_size(&ctx->mech_used, body_size);
+
+	ptr = (u16 *)token->data;
+	g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr);
+
+	/* ptr now at start of header described in rfc 1964, section 1.2.1: */
+	krb5_hdr = ptr;
+	*ptr++ = KG_TOK_MIC_MSG;
+	/*
+	 * signalg is stored as if it were converted from LE to host endian, even
+	 * though it's an opaque pair of bytes according to the RFC.
+	 */
+	*ptr++ = (__force u16)cpu_to_le16(ctx->gk5e->signalg);
+	*ptr++ = SEAL_ALG_NONE;
+	*ptr = 0xffff;
+
+	return krb5_hdr;
+}
+
+static void *
+setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
+{
+	u16 *ptr;
+	void *krb5_hdr;
+	u8 *p, flags = 0x00;
+
+	if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
+		flags |= 0x01;
+	if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
+		flags |= 0x04;
+
+	/* Per rfc 4121, sec 4.2.6.1, there is no header,
+	 * just start the token */
+	krb5_hdr = ptr = (u16 *)token->data;
+
+	*ptr++ = KG2_TOK_MIC;
+	p = (u8 *)ptr;
+	*p++ = flags;
+	*p++ = 0xff;
+	ptr = (u16 *)p;
+	*ptr++ = 0xffff;
+	*ptr = 0xffff;
+
+	token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
+	return krb5_hdr;
+}
+
+static u32
+gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
+		struct xdr_netobj *token)
+{
+	char			cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj	md5cksum = {.len = sizeof(cksumdata),
+					    .data = cksumdata};
+	void			*ptr;
+	s32			now;
+	u32			seq_send;
+	u8			*cksumkey;
+
+	dprintk("RPC:       %s\n", __func__);
+	BUG_ON(ctx == NULL);
+
+	now = get_seconds();
+
+	ptr = setup_token(ctx, token);
+
+	if (ctx->gk5e->keyed_cksum)
+		cksumkey = ctx->cksum;
+	else
+		cksumkey = NULL;
+
+	if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
+			  KG_USAGE_SIGN, &md5cksum))
+		return GSS_S_FAILURE;
+
+	memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
+
+	spin_lock(&krb5_seq_lock);
+	seq_send = ctx->seq_send++;
+	spin_unlock(&krb5_seq_lock);
+
+	if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff,
+			      seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))
+		return GSS_S_FAILURE;
+
+	return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
+
+static u32
+gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
+		struct xdr_netobj *token)
+{
+	char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
+				       .data = cksumdata};
+	void *krb5_hdr;
+	s32 now;
+	u64 seq_send;
+	u8 *cksumkey;
+	unsigned int cksum_usage;
+
+	dprintk("RPC:       %s\n", __func__);
+
+	krb5_hdr = setup_token_v2(ctx, token);
+
+	/* Set up the sequence number. Now 64-bits in clear
+	 * text and w/o direction indicator */
+	spin_lock(&krb5_seq_lock);
+	seq_send = ctx->seq_send64++;
+	spin_unlock(&krb5_seq_lock);
+	*((__be64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
+
+	if (ctx->initiate) {
+		cksumkey = ctx->initiator_sign;
+		cksum_usage = KG_USAGE_INITIATOR_SIGN;
+	} else {
+		cksumkey = ctx->acceptor_sign;
+		cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+	}
+
+	if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
+			     text, 0, cksumkey, cksum_usage, &cksumobj))
+		return GSS_S_FAILURE;
+
+	memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
+
+	now = get_seconds();
+
+	return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
+
+u32
+gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
+		     struct xdr_netobj *token)
+{
+	struct krb5_ctx		*ctx = gss_ctx->internal_ctx_id;
+
+	switch (ctx->enctype) {
+	default:
+		BUG();
+	case ENCTYPE_DES_CBC_RAW:
+	case ENCTYPE_DES3_CBC_RAW:
+	case ENCTYPE_ARCFOUR_HMAC:
+		return gss_get_mic_v1(ctx, text, token);
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		return gss_get_mic_v2(ctx, text, token);
+	}
+}
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_seqnum.c b/kernel/net/sunrpc/auth_gss/gss_krb5_seqnum.c
new file mode 100644
index 000000000..20d55c793
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_seqnum.c
@@ -0,0 +1,166 @@
+/*
+ *  linux/net/sunrpc/gss_krb5_seqnum.c
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
+ *
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/crypto.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+static s32
+krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum,
+		      unsigned char *cksum, unsigned char *buf)
+{
+	struct crypto_blkcipher *cipher;
+	unsigned char plain[8];
+	s32 code;
+
+	dprintk("RPC:       %s:\n", __func__);
+	cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+					CRYPTO_ALG_ASYNC);
+	if (IS_ERR(cipher))
+		return PTR_ERR(cipher);
+
+	plain[0] = (unsigned char) ((seqnum >> 24) & 0xff);
+	plain[1] = (unsigned char) ((seqnum >> 16) & 0xff);
+	plain[2] = (unsigned char) ((seqnum >> 8) & 0xff);
+	plain[3] = (unsigned char) ((seqnum >> 0) & 0xff);
+	plain[4] = direction;
+	plain[5] = direction;
+	plain[6] = direction;
+	plain[7] = direction;
+
+	code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
+	if (code)
+		goto out;
+
+	code = krb5_encrypt(cipher, cksum, plain, buf, 8);
+out:
+	crypto_free_blkcipher(cipher);
+	return code;
+}
+s32
+krb5_make_seq_num(struct krb5_ctx *kctx,
+		struct crypto_blkcipher *key,
+		int direction,
+		u32 seqnum,
+		unsigned char *cksum, unsigned char *buf)
+{
+	unsigned char plain[8];
+
+	if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
+		return krb5_make_rc4_seq_num(kctx, direction, seqnum,
+					     cksum, buf);
+
+	plain[0] = (unsigned char) (seqnum & 0xff);
+	plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
+	plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
+	plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
+
+	plain[4] = direction;
+	plain[5] = direction;
+	plain[6] = direction;
+	plain[7] = direction;
+
+	return krb5_encrypt(key, cksum, plain, buf, 8);
+}
+
+static s32
+krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum,
+		     unsigned char *buf, int *direction, s32 *seqnum)
+{
+	struct crypto_blkcipher *cipher;
+	unsigned char plain[8];
+	s32 code;
+
+	dprintk("RPC:       %s:\n", __func__);
+	cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+					CRYPTO_ALG_ASYNC);
+	if (IS_ERR(cipher))
+		return PTR_ERR(cipher);
+
+	code = krb5_rc4_setup_seq_key(kctx, cipher, cksum);
+	if (code)
+		goto out;
+
+	code = krb5_decrypt(cipher, cksum, buf, plain, 8);
+	if (code)
+		goto out;
+
+	if ((plain[4] != plain[5]) || (plain[4] != plain[6])
+				   || (plain[4] != plain[7])) {
+		code = (s32)KG_BAD_SEQ;
+		goto out;
+	}
+
+	*direction = plain[4];
+
+	*seqnum = ((plain[0] << 24) | (plain[1] << 16) |
+					(plain[2] << 8) | (plain[3]));
+out:
+	crypto_free_blkcipher(cipher);
+	return code;
+}
+
+s32
+krb5_get_seq_num(struct krb5_ctx *kctx,
+	       unsigned char *cksum,
+	       unsigned char *buf,
+	       int *direction, u32 *seqnum)
+{
+	s32 code;
+	unsigned char plain[8];
+	struct crypto_blkcipher *key = kctx->seq;
+
+	dprintk("RPC:       krb5_get_seq_num:\n");
+
+	if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC)
+		return krb5_get_rc4_seq_num(kctx, cksum, buf,
+					    direction, seqnum);
+
+	if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
+		return code;
+
+	if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
+	    (plain[4] != plain[7]))
+		return (s32)KG_BAD_SEQ;
+
+	*direction = plain[4];
+
+	*seqnum = ((plain[0]) |
+		   (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
+
+	return 0;
+}
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_unseal.c b/kernel/net/sunrpc/auth_gss/gss_krb5_unseal.c
new file mode 100644
index 000000000..dcf9515d9
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_unseal.c
@@ -0,0 +1,226 @@
+/*
+ *  linux/net/sunrpc/gss_krb5_unseal.c
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.c
+ *
+ *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may require
+ * a specific license from the United States Government.  It is the
+ * responsibility of any person or organization contemplating export to
+ * obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/types.h>
+#include <linux/jiffies.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/crypto.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+
+/* read_token is a mic token, and message_buffer is the data that the mic was
+ * supposedly taken over. */
+
+static u32
+gss_verify_mic_v1(struct krb5_ctx *ctx,
+		struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
+{
+	int			signalg;
+	int			sealalg;
+	char			cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj	md5cksum = {.len = sizeof(cksumdata),
+					    .data = cksumdata};
+	s32			now;
+	int			direction;
+	u32			seqnum;
+	unsigned char		*ptr = (unsigned char *)read_token->data;
+	int			bodysize;
+	u8			*cksumkey;
+
+	dprintk("RPC:       krb5_read_token\n");
+
+	if (g_verify_token_header(&ctx->mech_used, &bodysize, &ptr,
+					read_token->len))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	if ((ptr[0] != ((KG_TOK_MIC_MSG >> 8) & 0xff)) ||
+	    (ptr[1] !=  (KG_TOK_MIC_MSG & 0xff)))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	/* XXX sanity-check bodysize?? */
+
+	signalg = ptr[2] + (ptr[3] << 8);
+	if (signalg != ctx->gk5e->signalg)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	sealalg = ptr[4] + (ptr[5] << 8);
+	if (sealalg != SEAL_ALG_NONE)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	if (ctx->gk5e->keyed_cksum)
+		cksumkey = ctx->cksum;
+	else
+		cksumkey = NULL;
+
+	if (make_checksum(ctx, ptr, 8, message_buffer, 0,
+			  cksumkey, KG_USAGE_SIGN, &md5cksum))
+		return GSS_S_FAILURE;
+
+	if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
+					ctx->gk5e->cksumlength))
+		return GSS_S_BAD_SIG;
+
+	/* it got through unscathed.  Make sure the context is unexpired */
+
+	now = get_seconds();
+
+	if (now > ctx->endtime)
+		return GSS_S_CONTEXT_EXPIRED;
+
+	/* do sequencing checks */
+
+	if (krb5_get_seq_num(ctx, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8,
+			     &direction, &seqnum))
+		return GSS_S_FAILURE;
+
+	if ((ctx->initiate && direction != 0xff) ||
+	    (!ctx->initiate && direction != 0))
+		return GSS_S_BAD_SIG;
+
+	return GSS_S_COMPLETE;
+}
+
+static u32
+gss_verify_mic_v2(struct krb5_ctx *ctx,
+		struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
+{
+	char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj cksumobj = {.len = sizeof(cksumdata),
+				      .data = cksumdata};
+	s32 now;
+	u8 *ptr = read_token->data;
+	u8 *cksumkey;
+	u8 flags;
+	int i;
+	unsigned int cksum_usage;
+
+	dprintk("RPC:       %s\n", __func__);
+
+	if (be16_to_cpu(*((__be16 *)ptr)) != KG2_TOK_MIC)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	flags = ptr[2];
+	if ((!ctx->initiate && (flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)) ||
+	    (ctx->initiate && !(flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)))
+		return GSS_S_BAD_SIG;
+
+	if (flags & KG2_TOKEN_FLAG_SEALED) {
+		dprintk("%s: token has unexpected sealed flag\n", __func__);
+		return GSS_S_FAILURE;
+	}
+
+	for (i = 3; i < 8; i++)
+		if (ptr[i] != 0xff)
+			return GSS_S_DEFECTIVE_TOKEN;
+
+	if (ctx->initiate) {
+		cksumkey = ctx->acceptor_sign;
+		cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+	} else {
+		cksumkey = ctx->initiator_sign;
+		cksum_usage = KG_USAGE_INITIATOR_SIGN;
+	}
+
+	if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
+			     cksumkey, cksum_usage, &cksumobj))
+		return GSS_S_FAILURE;
+
+	if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,
+				ctx->gk5e->cksumlength))
+		return GSS_S_BAD_SIG;
+
+	/* it got through unscathed.  Make sure the context is unexpired */
+	now = get_seconds();
+	if (now > ctx->endtime)
+		return GSS_S_CONTEXT_EXPIRED;
+
+	/*
+	 * NOTE: the sequence number at ptr + 8 is skipped, rpcsec_gss
+	 * doesn't want it checked; see page 6 of rfc 2203.
+	 */
+
+	return GSS_S_COMPLETE;
+}
+
+u32
+gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
+			struct xdr_buf *message_buffer,
+			struct xdr_netobj *read_token)
+{
+	struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
+
+	switch (ctx->enctype) {
+	default:
+		BUG();
+	case ENCTYPE_DES_CBC_RAW:
+	case ENCTYPE_DES3_CBC_RAW:
+	case ENCTYPE_ARCFOUR_HMAC:
+		return gss_verify_mic_v1(ctx, message_buffer, read_token);
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		return gss_verify_mic_v2(ctx, message_buffer, read_token);
+	}
+}
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_krb5_wrap.c b/kernel/net/sunrpc/auth_gss/gss_krb5_wrap.c
new file mode 100644
index 000000000..ca7e92a32
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_krb5_wrap.c
@@ -0,0 +1,626 @@
+/*
+ * COPYRIGHT (c) 2008
+ * The Regents of the University of Michigan
+ * ALL RIGHTS RESERVED
+ *
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization.  If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+#include <linux/types.h>
+#include <linux/jiffies.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/random.h>
+#include <linux/pagemap.h>
+#include <linux/crypto.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+static inline int
+gss_krb5_padding(int blocksize, int length)
+{
+	return blocksize - (length % blocksize);
+}
+
+static inline void
+gss_krb5_add_padding(struct xdr_buf *buf, int offset, int blocksize)
+{
+	int padding = gss_krb5_padding(blocksize, buf->len - offset);
+	char *p;
+	struct kvec *iov;
+
+	if (buf->page_len || buf->tail[0].iov_len)
+		iov = &buf->tail[0];
+	else
+		iov = &buf->head[0];
+	p = iov->iov_base + iov->iov_len;
+	iov->iov_len += padding;
+	buf->len += padding;
+	memset(p, padding, padding);
+}
+
+static inline int
+gss_krb5_remove_padding(struct xdr_buf *buf, int blocksize)
+{
+	u8 *ptr;
+	u8 pad;
+	size_t len = buf->len;
+
+	if (len <= buf->head[0].iov_len) {
+		pad = *(u8 *)(buf->head[0].iov_base + len - 1);
+		if (pad > buf->head[0].iov_len)
+			return -EINVAL;
+		buf->head[0].iov_len -= pad;
+		goto out;
+	} else
+		len -= buf->head[0].iov_len;
+	if (len <= buf->page_len) {
+		unsigned int last = (buf->page_base + len - 1)
+					>>PAGE_CACHE_SHIFT;
+		unsigned int offset = (buf->page_base + len - 1)
+					& (PAGE_CACHE_SIZE - 1);
+		ptr = kmap_atomic(buf->pages[last]);
+		pad = *(ptr + offset);
+		kunmap_atomic(ptr);
+		goto out;
+	} else
+		len -= buf->page_len;
+	BUG_ON(len > buf->tail[0].iov_len);
+	pad = *(u8 *)(buf->tail[0].iov_base + len - 1);
+out:
+	/* XXX: NOTE: we do not adjust the page lengths--they represent
+	 * a range of data in the real filesystem page cache, and we need
+	 * to know that range so the xdr code can properly place read data.
+	 * However adjusting the head length, as we do above, is harmless.
+	 * In the case of a request that fits into a single page, the server
+	 * also uses length and head length together to determine the original
+	 * start of the request to copy the request for deferal; so it's
+	 * easier on the server if we adjust head and tail length in tandem.
+	 * It's not really a problem that we don't fool with the page and
+	 * tail lengths, though--at worst badly formed xdr might lead the
+	 * server to attempt to parse the padding.
+	 * XXX: Document all these weird requirements for gss mechanism
+	 * wrap/unwrap functions. */
+	if (pad > blocksize)
+		return -EINVAL;
+	if (buf->len > pad)
+		buf->len -= pad;
+	else
+		return -EINVAL;
+	return 0;
+}
+
+void
+gss_krb5_make_confounder(char *p, u32 conflen)
+{
+	static u64 i = 0;
+	u64 *q = (u64 *)p;
+
+	/* rfc1964 claims this should be "random".  But all that's really
+	 * necessary is that it be unique.  And not even that is necessary in
+	 * our case since our "gssapi" implementation exists only to support
+	 * rpcsec_gss, so we know that the only buffers we will ever encrypt
+	 * already begin with a unique sequence number.  Just to hedge my bets
+	 * I'll make a half-hearted attempt at something unique, but ensuring
+	 * uniqueness would mean worrying about atomicity and rollover, and I
+	 * don't care enough. */
+
+	/* initialize to random value */
+	if (i == 0) {
+		i = prandom_u32();
+		i = (i << 32) | prandom_u32();
+	}
+
+	switch (conflen) {
+	case 16:
+		*q++ = i++;
+		/* fall through */
+	case 8:
+		*q++ = i++;
+		break;
+	default:
+		BUG();
+	}
+}
+
+/* Assumptions: the head and tail of inbuf are ours to play with.
+ * The pages, however, may be real pages in the page cache and we replace
+ * them with scratch pages from **pages before writing to them. */
+/* XXX: obviously the above should be documentation of wrap interface,
+ * and shouldn't be in this kerberos-specific file. */
+
+/* XXX factor out common code with seal/unseal. */
+
+static u32
+gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
+		struct xdr_buf *buf, struct page **pages)
+{
+	char			cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj	md5cksum = {.len = sizeof(cksumdata),
+					    .data = cksumdata};
+	int			blocksize = 0, plainlen;
+	unsigned char		*ptr, *msg_start;
+	s32			now;
+	int			headlen;
+	struct page		**tmp_pages;
+	u32			seq_send;
+	u8			*cksumkey;
+	u32			conflen = kctx->gk5e->conflen;
+
+	dprintk("RPC:       %s\n", __func__);
+
+	now = get_seconds();
+
+	blocksize = crypto_blkcipher_blocksize(kctx->enc);
+	gss_krb5_add_padding(buf, offset, blocksize);
+	BUG_ON((buf->len - offset) % blocksize);
+	plainlen = conflen + buf->len - offset;
+
+	headlen = g_token_size(&kctx->mech_used,
+		GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength + plainlen) -
+		(buf->len - offset);
+
+	ptr = buf->head[0].iov_base + offset;
+	/* shift data to make room for header. */
+	xdr_extend_head(buf, offset, headlen);
+
+	/* XXX Would be cleverer to encrypt while copying. */
+	BUG_ON((buf->len - offset - headlen) % blocksize);
+
+	g_make_token_header(&kctx->mech_used,
+				GSS_KRB5_TOK_HDR_LEN +
+				kctx->gk5e->cksumlength + plainlen, &ptr);
+
+
+	/* ptr now at header described in rfc 1964, section 1.2.1: */
+	ptr[0] = (unsigned char) ((KG_TOK_WRAP_MSG >> 8) & 0xff);
+	ptr[1] = (unsigned char) (KG_TOK_WRAP_MSG & 0xff);
+
+	msg_start = ptr + GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength;
+
+	/*
+	 * signalg and sealalg are stored as if they were converted from LE
+	 * to host endian, even though they're opaque pairs of bytes according
+	 * to the RFC.
+	 */
+	*(__le16 *)(ptr + 2) = cpu_to_le16(kctx->gk5e->signalg);
+	*(__le16 *)(ptr + 4) = cpu_to_le16(kctx->gk5e->sealalg);
+	ptr[6] = 0xff;
+	ptr[7] = 0xff;
+
+	gss_krb5_make_confounder(msg_start, conflen);
+
+	if (kctx->gk5e->keyed_cksum)
+		cksumkey = kctx->cksum;
+	else
+		cksumkey = NULL;
+
+	/* XXXJBF: UGH!: */
+	tmp_pages = buf->pages;
+	buf->pages = pages;
+	if (make_checksum(kctx, ptr, 8, buf, offset + headlen - conflen,
+					cksumkey, KG_USAGE_SEAL, &md5cksum))
+		return GSS_S_FAILURE;
+	buf->pages = tmp_pages;
+
+	memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
+
+	spin_lock(&krb5_seq_lock);
+	seq_send = kctx->seq_send++;
+	spin_unlock(&krb5_seq_lock);
+
+	/* XXX would probably be more efficient to compute checksum
+	 * and encrypt at the same time: */
+	if ((krb5_make_seq_num(kctx, kctx->seq, kctx->initiate ? 0 : 0xff,
+			       seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8)))
+		return GSS_S_FAILURE;
+
+	if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) {
+		struct crypto_blkcipher *cipher;
+		int err;
+		cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+						CRYPTO_ALG_ASYNC);
+		if (IS_ERR(cipher))
+			return GSS_S_FAILURE;
+
+		krb5_rc4_setup_enc_key(kctx, cipher, seq_send);
+
+		err = gss_encrypt_xdr_buf(cipher, buf,
+					  offset + headlen - conflen, pages);
+		crypto_free_blkcipher(cipher);
+		if (err)
+			return GSS_S_FAILURE;
+	} else {
+		if (gss_encrypt_xdr_buf(kctx->enc, buf,
+					offset + headlen - conflen, pages))
+			return GSS_S_FAILURE;
+	}
+
+	return (kctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
+
+static u32
+gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
+{
+	int			signalg;
+	int			sealalg;
+	char			cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+	struct xdr_netobj	md5cksum = {.len = sizeof(cksumdata),
+					    .data = cksumdata};
+	s32			now;
+	int			direction;
+	s32			seqnum;
+	unsigned char		*ptr;
+	int			bodysize;
+	void			*data_start, *orig_start;
+	int			data_len;
+	int			blocksize;
+	u32			conflen = kctx->gk5e->conflen;
+	int			crypt_offset;
+	u8			*cksumkey;
+
+	dprintk("RPC:       gss_unwrap_kerberos\n");
+
+	ptr = (u8 *)buf->head[0].iov_base + offset;
+	if (g_verify_token_header(&kctx->mech_used, &bodysize, &ptr,
+					buf->len - offset))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	if ((ptr[0] != ((KG_TOK_WRAP_MSG >> 8) & 0xff)) ||
+	    (ptr[1] !=  (KG_TOK_WRAP_MSG & 0xff)))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	/* XXX sanity-check bodysize?? */
+
+	/* get the sign and seal algorithms */
+
+	signalg = ptr[2] + (ptr[3] << 8);
+	if (signalg != kctx->gk5e->signalg)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	sealalg = ptr[4] + (ptr[5] << 8);
+	if (sealalg != kctx->gk5e->sealalg)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	/*
+	 * Data starts after token header and checksum.  ptr points
+	 * to the beginning of the token header
+	 */
+	crypt_offset = ptr + (GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength) -
+					(unsigned char *)buf->head[0].iov_base;
+
+	/*
+	 * Need plaintext seqnum to derive encryption key for arcfour-hmac
+	 */
+	if (krb5_get_seq_num(kctx, ptr + GSS_KRB5_TOK_HDR_LEN,
+			     ptr + 8, &direction, &seqnum))
+		return GSS_S_BAD_SIG;
+
+	if ((kctx->initiate && direction != 0xff) ||
+	    (!kctx->initiate && direction != 0))
+		return GSS_S_BAD_SIG;
+
+	if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) {
+		struct crypto_blkcipher *cipher;
+		int err;
+
+		cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0,
+						CRYPTO_ALG_ASYNC);
+		if (IS_ERR(cipher))
+			return GSS_S_FAILURE;
+
+		krb5_rc4_setup_enc_key(kctx, cipher, seqnum);
+
+		err = gss_decrypt_xdr_buf(cipher, buf, crypt_offset);
+		crypto_free_blkcipher(cipher);
+		if (err)
+			return GSS_S_DEFECTIVE_TOKEN;
+	} else {
+		if (gss_decrypt_xdr_buf(kctx->enc, buf, crypt_offset))
+			return GSS_S_DEFECTIVE_TOKEN;
+	}
+
+	if (kctx->gk5e->keyed_cksum)
+		cksumkey = kctx->cksum;
+	else
+		cksumkey = NULL;
+
+	if (make_checksum(kctx, ptr, 8, buf, crypt_offset,
+					cksumkey, KG_USAGE_SEAL, &md5cksum))
+		return GSS_S_FAILURE;
+
+	if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
+						kctx->gk5e->cksumlength))
+		return GSS_S_BAD_SIG;
+
+	/* it got through unscathed.  Make sure the context is unexpired */
+
+	now = get_seconds();
+
+	if (now > kctx->endtime)
+		return GSS_S_CONTEXT_EXPIRED;
+
+	/* do sequencing checks */
+
+	/* Copy the data back to the right position.  XXX: Would probably be
+	 * better to copy and encrypt at the same time. */
+
+	blocksize = crypto_blkcipher_blocksize(kctx->enc);
+	data_start = ptr + (GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength) +
+					conflen;
+	orig_start = buf->head[0].iov_base + offset;
+	data_len = (buf->head[0].iov_base + buf->head[0].iov_len) - data_start;
+	memmove(orig_start, data_start, data_len);
+	buf->head[0].iov_len -= (data_start - orig_start);
+	buf->len -= (data_start - orig_start);
+
+	if (gss_krb5_remove_padding(buf, blocksize))
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	return GSS_S_COMPLETE;
+}
+
+/*
+ * We can shift data by up to LOCAL_BUF_LEN bytes in a pass.  If we need
+ * to do more than that, we shift repeatedly.  Kevin Coffman reports
+ * seeing 28 bytes as the value used by Microsoft clients and servers
+ * with AES, so this constant is chosen to allow handling 28 in one pass
+ * without using too much stack space.
+ *
+ * If that proves to a problem perhaps we could use a more clever
+ * algorithm.
+ */
+#define LOCAL_BUF_LEN 32u
+
+static void rotate_buf_a_little(struct xdr_buf *buf, unsigned int shift)
+{
+	char head[LOCAL_BUF_LEN];
+	char tmp[LOCAL_BUF_LEN];
+	unsigned int this_len, i;
+
+	BUG_ON(shift > LOCAL_BUF_LEN);
+
+	read_bytes_from_xdr_buf(buf, 0, head, shift);
+	for (i = 0; i + shift < buf->len; i += LOCAL_BUF_LEN) {
+		this_len = min(LOCAL_BUF_LEN, buf->len - (i + shift));
+		read_bytes_from_xdr_buf(buf, i+shift, tmp, this_len);
+		write_bytes_to_xdr_buf(buf, i, tmp, this_len);
+	}
+	write_bytes_to_xdr_buf(buf, buf->len - shift, head, shift);
+}
+
+static void _rotate_left(struct xdr_buf *buf, unsigned int shift)
+{
+	int shifted = 0;
+	int this_shift;
+
+	shift %= buf->len;
+	while (shifted < shift) {
+		this_shift = min(shift - shifted, LOCAL_BUF_LEN);
+		rotate_buf_a_little(buf, this_shift);
+		shifted += this_shift;
+	}
+}
+
+static void rotate_left(u32 base, struct xdr_buf *buf, unsigned int shift)
+{
+	struct xdr_buf subbuf;
+
+	xdr_buf_subsegment(buf, &subbuf, base, buf->len - base);
+	_rotate_left(&subbuf, shift);
+}
+
+static u32
+gss_wrap_kerberos_v2(struct krb5_ctx *kctx, u32 offset,
+		     struct xdr_buf *buf, struct page **pages)
+{
+	int		blocksize;
+	u8		*ptr, *plainhdr;
+	s32		now;
+	u8		flags = 0x00;
+	__be16		*be16ptr;
+	__be64		*be64ptr;
+	u32		err;
+
+	dprintk("RPC:       %s\n", __func__);
+
+	if (kctx->gk5e->encrypt_v2 == NULL)
+		return GSS_S_FAILURE;
+
+	/* make room for gss token header */
+	if (xdr_extend_head(buf, offset, GSS_KRB5_TOK_HDR_LEN))
+		return GSS_S_FAILURE;
+
+	/* construct gss token header */
+	ptr = plainhdr = buf->head[0].iov_base + offset;
+	*ptr++ = (unsigned char) ((KG2_TOK_WRAP>>8) & 0xff);
+	*ptr++ = (unsigned char) (KG2_TOK_WRAP & 0xff);
+
+	if ((kctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
+		flags |= KG2_TOKEN_FLAG_SENTBYACCEPTOR;
+	if ((kctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY) != 0)
+		flags |= KG2_TOKEN_FLAG_ACCEPTORSUBKEY;
+	/* We always do confidentiality in wrap tokens */
+	flags |= KG2_TOKEN_FLAG_SEALED;
+
+	*ptr++ = flags;
+	*ptr++ = 0xff;
+	be16ptr = (__be16 *)ptr;
+
+	blocksize = crypto_blkcipher_blocksize(kctx->acceptor_enc);
+	*be16ptr++ = 0;
+	/* "inner" token header always uses 0 for RRC */
+	*be16ptr++ = 0;
+
+	be64ptr = (__be64 *)be16ptr;
+	spin_lock(&krb5_seq_lock);
+	*be64ptr = cpu_to_be64(kctx->seq_send64++);
+	spin_unlock(&krb5_seq_lock);
+
+	err = (*kctx->gk5e->encrypt_v2)(kctx, offset, buf, pages);
+	if (err)
+		return err;
+
+	now = get_seconds();
+	return (kctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
+
+static u32
+gss_unwrap_kerberos_v2(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
+{
+	s32		now;
+	u8		*ptr;
+	u8		flags = 0x00;
+	u16		ec, rrc;
+	int		err;
+	u32		headskip, tailskip;
+	u8		decrypted_hdr[GSS_KRB5_TOK_HDR_LEN];
+	unsigned int	movelen;
+
+
+	dprintk("RPC:       %s\n", __func__);
+
+	if (kctx->gk5e->decrypt_v2 == NULL)
+		return GSS_S_FAILURE;
+
+	ptr = buf->head[0].iov_base + offset;
+
+	if (be16_to_cpu(*((__be16 *)ptr)) != KG2_TOK_WRAP)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	flags = ptr[2];
+	if ((!kctx->initiate && (flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)) ||
+	    (kctx->initiate && !(flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)))
+		return GSS_S_BAD_SIG;
+
+	if ((flags & KG2_TOKEN_FLAG_SEALED) == 0) {
+		dprintk("%s: token missing expected sealed flag\n", __func__);
+		return GSS_S_DEFECTIVE_TOKEN;
+	}
+
+	if (ptr[3] != 0xff)
+		return GSS_S_DEFECTIVE_TOKEN;
+
+	ec = be16_to_cpup((__be16 *)(ptr + 4));
+	rrc = be16_to_cpup((__be16 *)(ptr + 6));
+
+	/*
+	 * NOTE: the sequence number at ptr + 8 is skipped, rpcsec_gss
+	 * doesn't want it checked; see page 6 of rfc 2203.
+	 */
+
+	if (rrc != 0)
+		rotate_left(offset + 16, buf, rrc);
+
+	err = (*kctx->gk5e->decrypt_v2)(kctx, offset, buf,
+					&headskip, &tailskip);
+	if (err)
+		return GSS_S_FAILURE;
+
+	/*
+	 * Retrieve the decrypted gss token header and verify
+	 * it against the original
+	 */
+	err = read_bytes_from_xdr_buf(buf,
+				buf->len - GSS_KRB5_TOK_HDR_LEN - tailskip,
+				decrypted_hdr, GSS_KRB5_TOK_HDR_LEN);
+	if (err) {
+		dprintk("%s: error %u getting decrypted_hdr\n", __func__, err);
+		return GSS_S_FAILURE;
+	}
+	if (memcmp(ptr, decrypted_hdr, 6)
+				|| memcmp(ptr + 8, decrypted_hdr + 8, 8)) {
+		dprintk("%s: token hdr, plaintext hdr mismatch!\n", __func__);
+		return GSS_S_FAILURE;
+	}
+
+	/* do sequencing checks */
+
+	/* it got through unscathed.  Make sure the context is unexpired */
+	now = get_seconds();
+	if (now > kctx->endtime)
+		return GSS_S_CONTEXT_EXPIRED;
+
+	/*
+	 * Move the head data back to the right position in xdr_buf.
+	 * We ignore any "ec" data since it might be in the head or
+	 * the tail, and we really don't need to deal with it.
+	 * Note that buf->head[0].iov_len may indicate the available
+	 * head buffer space rather than that actually occupied.
+	 */
+	movelen = min_t(unsigned int, buf->head[0].iov_len, buf->len);
+	movelen -= offset + GSS_KRB5_TOK_HDR_LEN + headskip;
+	BUG_ON(offset + GSS_KRB5_TOK_HDR_LEN + headskip + movelen >
+							buf->head[0].iov_len);
+	memmove(ptr, ptr + GSS_KRB5_TOK_HDR_LEN + headskip, movelen);
+	buf->head[0].iov_len -= GSS_KRB5_TOK_HDR_LEN + headskip;
+	buf->len -= GSS_KRB5_TOK_HDR_LEN + headskip;
+
+	/* Trim off the trailing "extra count" and checksum blob */
+	xdr_buf_trim(buf, ec + GSS_KRB5_TOK_HDR_LEN + tailskip);
+	return GSS_S_COMPLETE;
+}
+
+u32
+gss_wrap_kerberos(struct gss_ctx *gctx, int offset,
+		  struct xdr_buf *buf, struct page **pages)
+{
+	struct krb5_ctx	*kctx = gctx->internal_ctx_id;
+
+	switch (kctx->enctype) {
+	default:
+		BUG();
+	case ENCTYPE_DES_CBC_RAW:
+	case ENCTYPE_DES3_CBC_RAW:
+	case ENCTYPE_ARCFOUR_HMAC:
+		return gss_wrap_kerberos_v1(kctx, offset, buf, pages);
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		return gss_wrap_kerberos_v2(kctx, offset, buf, pages);
+	}
+}
+
+u32
+gss_unwrap_kerberos(struct gss_ctx *gctx, int offset, struct xdr_buf *buf)
+{
+	struct krb5_ctx	*kctx = gctx->internal_ctx_id;
+
+	switch (kctx->enctype) {
+	default:
+		BUG();
+	case ENCTYPE_DES_CBC_RAW:
+	case ENCTYPE_DES3_CBC_RAW:
+	case ENCTYPE_ARCFOUR_HMAC:
+		return gss_unwrap_kerberos_v1(kctx, offset, buf);
+	case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+	case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+		return gss_unwrap_kerberos_v2(kctx, offset, buf);
+	}
+}
+
diff --git a/kernel/net/sunrpc/auth_gss/gss_mech_switch.c b/kernel/net/sunrpc/auth_gss/gss_mech_switch.c
new file mode 100644
index 000000000..7063d856a
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_mech_switch.c
@@ -0,0 +1,481 @@
+/*
+ *  linux/net/sunrpc/gss_mech_switch.c
+ *
+ *  Copyright (c) 2001 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  J. Bruce Fields   <bfields@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/oid_registry.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/gss_asn1.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/clnt.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY        RPCDBG_AUTH
+#endif
+
+static LIST_HEAD(registered_mechs);
+static DEFINE_SPINLOCK(registered_mechs_lock);
+
+static void
+gss_mech_free(struct gss_api_mech *gm)
+{
+	struct pf_desc *pf;
+	int i;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		pf = &gm->gm_pfs[i];
+		kfree(pf->auth_domain_name);
+		pf->auth_domain_name = NULL;
+	}
+}
+
+static inline char *
+make_auth_domain_name(char *name)
+{
+	static char	*prefix = "gss/";
+	char		*new;
+
+	new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
+	if (new) {
+		strcpy(new, prefix);
+		strcat(new, name);
+	}
+	return new;
+}
+
+static int
+gss_mech_svc_setup(struct gss_api_mech *gm)
+{
+	struct pf_desc *pf;
+	int i, status;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		pf = &gm->gm_pfs[i];
+		pf->auth_domain_name = make_auth_domain_name(pf->name);
+		status = -ENOMEM;
+		if (pf->auth_domain_name == NULL)
+			goto out;
+		status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
+							pf->auth_domain_name);
+		if (status)
+			goto out;
+	}
+	return 0;
+out:
+	gss_mech_free(gm);
+	return status;
+}
+
+/**
+ * gss_mech_register - register a GSS mechanism
+ * @gm: GSS mechanism handle
+ *
+ * Returns zero if successful, or a negative errno.
+ */
+int gss_mech_register(struct gss_api_mech *gm)
+{
+	int status;
+
+	status = gss_mech_svc_setup(gm);
+	if (status)
+		return status;
+	spin_lock(&registered_mechs_lock);
+	list_add(&gm->gm_list, &registered_mechs);
+	spin_unlock(&registered_mechs_lock);
+	dprintk("RPC:       registered gss mechanism %s\n", gm->gm_name);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gss_mech_register);
+
+/**
+ * gss_mech_unregister - release a GSS mechanism
+ * @gm: GSS mechanism handle
+ *
+ */
+void gss_mech_unregister(struct gss_api_mech *gm)
+{
+	spin_lock(&registered_mechs_lock);
+	list_del(&gm->gm_list);
+	spin_unlock(&registered_mechs_lock);
+	dprintk("RPC:       unregistered gss mechanism %s\n", gm->gm_name);
+	gss_mech_free(gm);
+}
+EXPORT_SYMBOL_GPL(gss_mech_unregister);
+
+struct gss_api_mech *gss_mech_get(struct gss_api_mech *gm)
+{
+	__module_get(gm->gm_owner);
+	return gm;
+}
+EXPORT_SYMBOL(gss_mech_get);
+
+static struct gss_api_mech *
+_gss_mech_get_by_name(const char *name)
+{
+	struct gss_api_mech	*pos, *gm = NULL;
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		if (0 == strcmp(name, pos->gm_name)) {
+			if (try_module_get(pos->gm_owner))
+				gm = pos;
+			break;
+		}
+	}
+	spin_unlock(&registered_mechs_lock);
+	return gm;
+
+}
+
+struct gss_api_mech * gss_mech_get_by_name(const char *name)
+{
+	struct gss_api_mech *gm = NULL;
+
+	gm = _gss_mech_get_by_name(name);
+	if (!gm) {
+		request_module("rpc-auth-gss-%s", name);
+		gm = _gss_mech_get_by_name(name);
+	}
+	return gm;
+}
+
+struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
+{
+	struct gss_api_mech	*pos, *gm = NULL;
+	char buf[32];
+
+	if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
+		return NULL;
+	dprintk("RPC:       %s(%s)\n", __func__, buf);
+	request_module("rpc-auth-gss-%s", buf);
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		if (obj->len == pos->gm_oid.len) {
+			if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
+				if (try_module_get(pos->gm_owner))
+					gm = pos;
+				break;
+			}
+		}
+	}
+	spin_unlock(&registered_mechs_lock);
+	return gm;
+}
+
+static inline int
+mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
+{
+	int i;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
+			return 1;
+	}
+	return 0;
+}
+
+static struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
+{
+	struct gss_api_mech *gm = NULL, *pos;
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		if (!mech_supports_pseudoflavor(pos, pseudoflavor))
+			continue;
+		if (try_module_get(pos->gm_owner))
+			gm = pos;
+		break;
+	}
+	spin_unlock(&registered_mechs_lock);
+	return gm;
+}
+
+struct gss_api_mech *
+gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
+{
+	struct gss_api_mech *gm;
+
+	gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
+
+	if (!gm) {
+		request_module("rpc-auth-gss-%u", pseudoflavor);
+		gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
+	}
+	return gm;
+}
+
+/**
+ * gss_mech_list_pseudoflavors - Discover registered GSS pseudoflavors
+ * @array: array to fill in
+ * @size: size of "array"
+ *
+ * Returns the number of array items filled in, or a negative errno.
+ *
+ * The returned array is not sorted by any policy.  Callers should not
+ * rely on the order of the items in the returned array.
+ */
+int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr, int size)
+{
+	struct gss_api_mech *pos = NULL;
+	int j, i = 0;
+
+	spin_lock(&registered_mechs_lock);
+	list_for_each_entry(pos, &registered_mechs, gm_list) {
+		for (j = 0; j < pos->gm_pf_num; j++) {
+			if (i >= size) {
+				spin_unlock(&registered_mechs_lock);
+				return -ENOMEM;
+			}
+			array_ptr[i++] = pos->gm_pfs[j].pseudoflavor;
+		}
+	}
+	spin_unlock(&registered_mechs_lock);
+	return i;
+}
+
+/**
+ * gss_svc_to_pseudoflavor - map a GSS service number to a pseudoflavor
+ * @gm: GSS mechanism handle
+ * @qop: GSS quality-of-protection value
+ * @service: GSS service value
+ *
+ * Returns a matching security flavor, or RPC_AUTH_MAXFLAVOR if none is found.
+ */
+rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 qop,
+					 u32 service)
+{
+	int i;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (gm->gm_pfs[i].qop == qop &&
+		    gm->gm_pfs[i].service == service) {
+			return gm->gm_pfs[i].pseudoflavor;
+		}
+	}
+	return RPC_AUTH_MAXFLAVOR;
+}
+
+/**
+ * gss_mech_info2flavor - look up a pseudoflavor given a GSS tuple
+ * @info: a GSS mech OID, quality of protection, and service value
+ *
+ * Returns a matching pseudoflavor, or RPC_AUTH_MAXFLAVOR if the tuple is
+ * not supported.
+ */
+rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *info)
+{
+	rpc_authflavor_t pseudoflavor;
+	struct gss_api_mech *gm;
+
+	gm = gss_mech_get_by_OID(&info->oid);
+	if (gm == NULL)
+		return RPC_AUTH_MAXFLAVOR;
+
+	pseudoflavor = gss_svc_to_pseudoflavor(gm, info->qop, info->service);
+
+	gss_mech_put(gm);
+	return pseudoflavor;
+}
+
+/**
+ * gss_mech_flavor2info - look up a GSS tuple for a given pseudoflavor
+ * @pseudoflavor: GSS pseudoflavor to match
+ * @info: rpcsec_gss_info structure to fill in
+ *
+ * Returns zero and fills in "info" if pseudoflavor matches a
+ * supported mechanism.  Otherwise a negative errno is returned.
+ */
+int gss_mech_flavor2info(rpc_authflavor_t pseudoflavor,
+			 struct rpcsec_gss_info *info)
+{
+	struct gss_api_mech *gm;
+	int i;
+
+	gm = gss_mech_get_by_pseudoflavor(pseudoflavor);
+	if (gm == NULL)
+		return -ENOENT;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) {
+			memcpy(info->oid.data, gm->gm_oid.data, gm->gm_oid.len);
+			info->oid.len = gm->gm_oid.len;
+			info->qop = gm->gm_pfs[i].qop;
+			info->service = gm->gm_pfs[i].service;
+			gss_mech_put(gm);
+			return 0;
+		}
+	}
+
+	gss_mech_put(gm);
+	return -ENOENT;
+}
+
+u32
+gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
+{
+	int i;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
+			return gm->gm_pfs[i].service;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(gss_pseudoflavor_to_service);
+
+char *
+gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
+{
+	int i;
+
+	for (i = 0; i < gm->gm_pf_num; i++) {
+		if (gm->gm_pfs[i].service == service)
+			return gm->gm_pfs[i].auth_domain_name;
+	}
+	return NULL;
+}
+
+void
+gss_mech_put(struct gss_api_mech * gm)
+{
+	if (gm)
+		module_put(gm->gm_owner);
+}
+EXPORT_SYMBOL(gss_mech_put);
+
+/* The mech could probably be determined from the token instead, but it's just
+ * as easy for now to pass it in. */
+int
+gss_import_sec_context(const void *input_token, size_t bufsize,
+		       struct gss_api_mech	*mech,
+		       struct gss_ctx		**ctx_id,
+		       time_t			*endtime,
+		       gfp_t gfp_mask)
+{
+	if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
+		return -ENOMEM;
+	(*ctx_id)->mech_type = gss_mech_get(mech);
+
+	return mech->gm_ops->gss_import_sec_context(input_token, bufsize,
+						*ctx_id, endtime, gfp_mask);
+}
+
+/* gss_get_mic: compute a mic over message and return mic_token. */
+
+u32
+gss_get_mic(struct gss_ctx	*context_handle,
+	    struct xdr_buf	*message,
+	    struct xdr_netobj	*mic_token)
+{
+	 return context_handle->mech_type->gm_ops
+		->gss_get_mic(context_handle,
+			      message,
+			      mic_token);
+}
+
+/* gss_verify_mic: check whether the provided mic_token verifies message. */
+
+u32
+gss_verify_mic(struct gss_ctx		*context_handle,
+	       struct xdr_buf		*message,
+	       struct xdr_netobj	*mic_token)
+{
+	return context_handle->mech_type->gm_ops
+		->gss_verify_mic(context_handle,
+				 message,
+				 mic_token);
+}
+
+/*
+ * This function is called from both the client and server code.
+ * Each makes guarantees about how much "slack" space is available
+ * for the underlying function in "buf"'s head and tail while
+ * performing the wrap.
+ *
+ * The client and server code allocate RPC_MAX_AUTH_SIZE extra
+ * space in both the head and tail which is available for use by
+ * the wrap function.
+ *
+ * Underlying functions should verify they do not use more than
+ * RPC_MAX_AUTH_SIZE of extra space in either the head or tail
+ * when performing the wrap.
+ */
+u32
+gss_wrap(struct gss_ctx	*ctx_id,
+	 int		offset,
+	 struct xdr_buf	*buf,
+	 struct page	**inpages)
+{
+	return ctx_id->mech_type->gm_ops
+		->gss_wrap(ctx_id, offset, buf, inpages);
+}
+
+u32
+gss_unwrap(struct gss_ctx	*ctx_id,
+	   int			offset,
+	   struct xdr_buf	*buf)
+{
+	return ctx_id->mech_type->gm_ops
+		->gss_unwrap(ctx_id, offset, buf);
+}
+
+
+/* gss_delete_sec_context: free all resources associated with context_handle.
+ * Note this differs from the RFC 2744-specified prototype in that we don't
+ * bother returning an output token, since it would never be used anyway. */
+
+u32
+gss_delete_sec_context(struct gss_ctx	**context_handle)
+{
+	dprintk("RPC:       gss_delete_sec_context deleting %p\n",
+			*context_handle);
+
+	if (!*context_handle)
+		return GSS_S_NO_CONTEXT;
+	if ((*context_handle)->internal_ctx_id)
+		(*context_handle)->mech_type->gm_ops
+			->gss_delete_sec_context((*context_handle)
+							->internal_ctx_id);
+	gss_mech_put((*context_handle)->mech_type);
+	kfree(*context_handle);
+	*context_handle=NULL;
+	return GSS_S_COMPLETE;
+}
diff --git a/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.c b/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.c
new file mode 100644
index 000000000..59eeed43e
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.c
@@ -0,0 +1,384 @@
+/*
+ *  linux/net/sunrpc/gss_rpc_upcall.c
+ *
+ *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/types.h>
+#include <linux/un.h>
+
+#include <linux/sunrpc/svcauth.h>
+#include "gss_rpc_upcall.h"
+
+#define GSSPROXY_SOCK_PATHNAME	"/var/run/gssproxy.sock"
+
+#define GSSPROXY_PROGRAM	(400112u)
+#define GSSPROXY_VERS_1		(1u)
+
+/*
+ * Encoding/Decoding functions
+ */
+
+enum {
+	GSSX_NULL = 0,	/* Unused */
+        GSSX_INDICATE_MECHS = 1,
+        GSSX_GET_CALL_CONTEXT = 2,
+        GSSX_IMPORT_AND_CANON_NAME = 3,
+        GSSX_EXPORT_CRED = 4,
+        GSSX_IMPORT_CRED = 5,
+        GSSX_ACQUIRE_CRED = 6,
+        GSSX_STORE_CRED = 7,
+        GSSX_INIT_SEC_CONTEXT = 8,
+        GSSX_ACCEPT_SEC_CONTEXT = 9,
+        GSSX_RELEASE_HANDLE = 10,
+        GSSX_GET_MIC = 11,
+        GSSX_VERIFY = 12,
+        GSSX_WRAP = 13,
+        GSSX_UNWRAP = 14,
+        GSSX_WRAP_SIZE_LIMIT = 15,
+};
+
+#define PROC(proc, name)				\
+[GSSX_##proc] = {					\
+	.p_proc   = GSSX_##proc,			\
+	.p_encode = (kxdreproc_t)gssx_enc_##name,	\
+	.p_decode = (kxdrdproc_t)gssx_dec_##name,	\
+	.p_arglen = GSSX_ARG_##name##_sz,		\
+	.p_replen = GSSX_RES_##name##_sz, 		\
+	.p_statidx = GSSX_##proc,			\
+	.p_name   = #proc,				\
+}
+
+static struct rpc_procinfo gssp_procedures[] = {
+	PROC(INDICATE_MECHS, indicate_mechs),
+        PROC(GET_CALL_CONTEXT, get_call_context),
+        PROC(IMPORT_AND_CANON_NAME, import_and_canon_name),
+        PROC(EXPORT_CRED, export_cred),
+        PROC(IMPORT_CRED, import_cred),
+        PROC(ACQUIRE_CRED, acquire_cred),
+        PROC(STORE_CRED, store_cred),
+        PROC(INIT_SEC_CONTEXT, init_sec_context),
+        PROC(ACCEPT_SEC_CONTEXT, accept_sec_context),
+        PROC(RELEASE_HANDLE, release_handle),
+        PROC(GET_MIC, get_mic),
+        PROC(VERIFY, verify),
+        PROC(WRAP, wrap),
+        PROC(UNWRAP, unwrap),
+        PROC(WRAP_SIZE_LIMIT, wrap_size_limit),
+};
+
+
+
+/*
+ * Common transport functions
+ */
+
+static const struct rpc_program gssp_program;
+
+static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt)
+{
+	static const struct sockaddr_un gssp_localaddr = {
+		.sun_family		= AF_LOCAL,
+		.sun_path		= GSSPROXY_SOCK_PATHNAME,
+	};
+	struct rpc_create_args args = {
+		.net		= net,
+		.protocol	= XPRT_TRANSPORT_LOCAL,
+		.address	= (struct sockaddr *)&gssp_localaddr,
+		.addrsize	= sizeof(gssp_localaddr),
+		.servername	= "localhost",
+		.program	= &gssp_program,
+		.version	= GSSPROXY_VERS_1,
+		.authflavor	= RPC_AUTH_NULL,
+		/*
+		 * Note we want connection to be done in the caller's
+		 * filesystem namespace.  We therefore turn off the idle
+		 * timeout, which would result in reconnections being
+		 * done without the correct namespace:
+		 */
+		.flags		= RPC_CLNT_CREATE_NOPING |
+				  RPC_CLNT_CREATE_NO_IDLE_TIMEOUT
+	};
+	struct rpc_clnt *clnt;
+	int result = 0;
+
+	clnt = rpc_create(&args);
+	if (IS_ERR(clnt)) {
+		dprintk("RPC:       failed to create AF_LOCAL gssproxy "
+				"client (errno %ld).\n", PTR_ERR(clnt));
+		result = PTR_ERR(clnt);
+		*_clnt = NULL;
+		goto out;
+	}
+
+	dprintk("RPC:       created new gssp local client (gssp_local_clnt: "
+			"%p)\n", clnt);
+	*_clnt = clnt;
+
+out:
+	return result;
+}
+
+void init_gssp_clnt(struct sunrpc_net *sn)
+{
+	mutex_init(&sn->gssp_lock);
+	sn->gssp_clnt = NULL;
+}
+
+int set_gssp_clnt(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_clnt *clnt;
+	int ret;
+
+	mutex_lock(&sn->gssp_lock);
+	ret = gssp_rpc_create(net, &clnt);
+	if (!ret) {
+		if (sn->gssp_clnt)
+			rpc_shutdown_client(sn->gssp_clnt);
+		sn->gssp_clnt = clnt;
+	}
+	mutex_unlock(&sn->gssp_lock);
+	return ret;
+}
+
+void clear_gssp_clnt(struct sunrpc_net *sn)
+{
+	mutex_lock(&sn->gssp_lock);
+	if (sn->gssp_clnt) {
+		rpc_shutdown_client(sn->gssp_clnt);
+		sn->gssp_clnt = NULL;
+	}
+	mutex_unlock(&sn->gssp_lock);
+}
+
+static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn)
+{
+	struct rpc_clnt *clnt;
+
+	mutex_lock(&sn->gssp_lock);
+	clnt = sn->gssp_clnt;
+	if (clnt)
+		atomic_inc(&clnt->cl_count);
+	mutex_unlock(&sn->gssp_lock);
+	return clnt;
+}
+
+static int gssp_call(struct net *net, struct rpc_message *msg)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_clnt *clnt;
+	int status;
+
+	clnt = get_gssp_clnt(sn);
+	if (!clnt)
+		return -EIO;
+	status = rpc_call_sync(clnt, msg, 0);
+	if (status < 0) {
+		dprintk("gssp: rpc_call returned error %d\n", -status);
+		switch (status) {
+		case -EPROTONOSUPPORT:
+			status = -EINVAL;
+			break;
+		case -ECONNREFUSED:
+		case -ETIMEDOUT:
+		case -ENOTCONN:
+			status = -EAGAIN;
+			break;
+		case -ERESTARTSYS:
+			if (signalled ())
+				status = -EINTR;
+			break;
+		default:
+			break;
+		}
+	}
+	rpc_release_client(clnt);
+	return status;
+}
+
+static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
+{
+	int i;
+
+	for (i = 0; i < arg->npages && arg->pages[i]; i++)
+		__free_page(arg->pages[i]);
+
+	kfree(arg->pages);
+}
+
+static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
+{
+	arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
+	arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL);
+	/*
+	 * XXX: actual pages are allocated by xdr layer in
+	 * xdr_partial_copy_from_skb.
+	 */
+	if (!arg->pages)
+		return -ENOMEM;
+	return 0;
+}
+
+/*
+ * Public functions
+ */
+
+/* numbers somewhat arbitrary but large enough for current needs */
+#define GSSX_MAX_OUT_HANDLE	128
+#define GSSX_MAX_SRC_PRINC	256
+#define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \
+			GSSX_max_oid_sz + \
+			GSSX_max_princ_sz + \
+			sizeof(struct svc_cred))
+
+int gssp_accept_sec_context_upcall(struct net *net,
+				struct gssp_upcall_data *data)
+{
+	struct gssx_ctx ctxh = {
+		.state = data->in_handle
+	};
+	struct gssx_arg_accept_sec_context arg = {
+		.input_token = data->in_token,
+	};
+	struct gssx_ctx rctxh = {
+		/*
+		 * pass in the max length we expect for each of these
+		 * buffers but let the xdr code kmalloc them:
+		 */
+		.exported_context_token.len = GSSX_max_output_handle_sz,
+		.mech.len = GSS_OID_MAX_LEN,
+		.src_name.display_name.len = GSSX_max_princ_sz
+	};
+	struct gssx_res_accept_sec_context res = {
+		.context_handle = &rctxh,
+		.output_token = &data->out_token
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT],
+		.rpc_argp = &arg,
+		.rpc_resp = &res,
+		.rpc_cred = NULL, /* FIXME ? */
+	};
+	struct xdr_netobj client_name = { 0 , NULL };
+	int ret;
+
+	if (data->in_handle.len != 0)
+		arg.context_handle = &ctxh;
+	res.output_token->len = GSSX_max_output_token_sz;
+
+	ret = gssp_alloc_receive_pages(&arg);
+	if (ret)
+		return ret;
+
+	/* use nfs/ for targ_name ? */
+
+	ret = gssp_call(net, &msg);
+
+	gssp_free_receive_pages(&arg);
+
+	/* we need to fetch all data even in case of error so
+	 * that we can free special strctures is they have been allocated */
+	data->major_status = res.status.major_status;
+	data->minor_status = res.status.minor_status;
+	if (res.context_handle) {
+		data->out_handle = rctxh.exported_context_token;
+		data->mech_oid.len = rctxh.mech.len;
+		if (rctxh.mech.data)
+			memcpy(data->mech_oid.data, rctxh.mech.data,
+						data->mech_oid.len);
+		client_name = rctxh.src_name.display_name;
+	}
+
+	if (res.options.count == 1) {
+		gssx_buffer *value = &res.options.data[0].value;
+		/* Currently we only decode CREDS_VALUE, if we add
+		 * anything else we'll have to loop and match on the
+		 * option name */
+		if (value->len == 1) {
+			/* steal group info from struct svc_cred */
+			data->creds = *(struct svc_cred *)value->data;
+			data->found_creds = 1;
+		}
+		/* whether we use it or not, free data */
+		kfree(value->data);
+	}
+
+	if (res.options.count != 0) {
+		kfree(res.options.data);
+	}
+
+	/* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
+	if (data->found_creds && client_name.data != NULL) {
+		char *c;
+
+		data->creds.cr_principal = kstrndup(client_name.data,
+						client_name.len, GFP_KERNEL);
+		if (data->creds.cr_principal) {
+			/* terminate and remove realm part */
+			c = strchr(data->creds.cr_principal, '@');
+			if (c) {
+				*c = '\0';
+
+				/* change service-hostname delimiter */
+				c = strchr(data->creds.cr_principal, '/');
+				if (c) *c = '@';
+			}
+			if (!c) {
+				/* not a service principal */
+				kfree(data->creds.cr_principal);
+				data->creds.cr_principal = NULL;
+			}
+		}
+	}
+	kfree(client_name.data);
+
+	return ret;
+}
+
+void gssp_free_upcall_data(struct gssp_upcall_data *data)
+{
+	kfree(data->in_handle.data);
+	kfree(data->out_handle.data);
+	kfree(data->out_token.data);
+	free_svc_cred(&data->creds);
+}
+
+/*
+ * Initialization stuff
+ */
+
+static const struct rpc_version gssp_version1 = {
+	.number		= GSSPROXY_VERS_1,
+	.nrprocs	= ARRAY_SIZE(gssp_procedures),
+	.procs		= gssp_procedures,
+};
+
+static const struct rpc_version *gssp_version[] = {
+	NULL,
+	&gssp_version1,
+};
+
+static struct rpc_stat gssp_stats;
+
+static const struct rpc_program gssp_program = {
+	.name		= "gssproxy",
+	.number		= GSSPROXY_PROGRAM,
+	.nrvers		= ARRAY_SIZE(gssp_version),
+	.version	= gssp_version,
+	.stats		= &gssp_stats,
+};
diff --git a/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.h b/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.h
new file mode 100644
index 000000000..1e542aded
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_rpc_upcall.h
@@ -0,0 +1,48 @@
+/*
+ *  linux/net/sunrpc/gss_rpc_upcall.h
+ *
+ *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _GSS_RPC_UPCALL_H
+#define _GSS_RPC_UPCALL_H
+
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/auth_gss.h>
+#include "gss_rpc_xdr.h"
+#include "../netns.h"
+
+struct gssp_upcall_data {
+	struct xdr_netobj in_handle;
+	struct gssp_in_token in_token;
+	struct xdr_netobj out_handle;
+	struct xdr_netobj out_token;
+	struct rpcsec_gss_oid mech_oid;
+	struct svc_cred creds;
+	int found_creds;
+	int major_status;
+	int minor_status;
+};
+
+int gssp_accept_sec_context_upcall(struct net *net,
+				struct gssp_upcall_data *data);
+void gssp_free_upcall_data(struct gssp_upcall_data *data);
+
+void init_gssp_clnt(struct sunrpc_net *);
+int set_gssp_clnt(struct net *);
+void clear_gssp_clnt(struct sunrpc_net *);
+#endif /* _GSS_RPC_UPCALL_H */
diff --git a/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.c b/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.c
new file mode 100644
index 000000000..eeeba5ade
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -0,0 +1,848 @@
+/*
+ * GSS Proxy upcall module
+ *
+ *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/sunrpc/svcauth.h>
+#include "gss_rpc_xdr.h"
+
+static int gssx_enc_bool(struct xdr_stream *xdr, int v)
+{
+	__be32 *p;
+
+	p = xdr_reserve_space(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	*p = v ? xdr_one : xdr_zero;
+	return 0;
+}
+
+static int gssx_dec_bool(struct xdr_stream *xdr, u32 *v)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	*v = be32_to_cpu(*p);
+	return 0;
+}
+
+static int gssx_enc_buffer(struct xdr_stream *xdr,
+			   gssx_buffer *buf)
+{
+	__be32 *p;
+
+	p = xdr_reserve_space(xdr, sizeof(u32) + buf->len);
+	if (!p)
+		return -ENOSPC;
+	xdr_encode_opaque(p, buf->data, buf->len);
+	return 0;
+}
+
+static int gssx_enc_in_token(struct xdr_stream *xdr,
+			     struct gssp_in_token *in)
+{
+	__be32 *p;
+
+	p = xdr_reserve_space(xdr, 4);
+	if (!p)
+		return -ENOSPC;
+	*p = cpu_to_be32(in->page_len);
+
+	/* all we need to do is to write pages */
+	xdr_write_pages(xdr, in->pages, in->page_base, in->page_len);
+
+	return 0;
+}
+
+
+static int gssx_dec_buffer(struct xdr_stream *xdr,
+			   gssx_buffer *buf)
+{
+	u32 length;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+
+	length = be32_to_cpup(p);
+	p = xdr_inline_decode(xdr, length);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+
+	if (buf->len == 0) {
+		/* we intentionally are not interested in this buffer */
+		return 0;
+	}
+	if (length > buf->len)
+		return -ENOSPC;
+
+	if (!buf->data) {
+		buf->data = kmemdup(p, length, GFP_KERNEL);
+		if (!buf->data)
+			return -ENOMEM;
+	} else {
+		memcpy(buf->data, p, length);
+	}
+	buf->len = length;
+	return 0;
+}
+
+static int gssx_enc_option(struct xdr_stream *xdr,
+			   struct gssx_option *opt)
+{
+	int err;
+
+	err = gssx_enc_buffer(xdr, &opt->option);
+	if (err)
+		return err;
+	err = gssx_enc_buffer(xdr, &opt->value);
+	return err;
+}
+
+static int gssx_dec_option(struct xdr_stream *xdr,
+			   struct gssx_option *opt)
+{
+	int err;
+
+	err = gssx_dec_buffer(xdr, &opt->option);
+	if (err)
+		return err;
+	err = gssx_dec_buffer(xdr, &opt->value);
+	return err;
+}
+
+static int dummy_enc_opt_array(struct xdr_stream *xdr,
+				struct gssx_option_array *oa)
+{
+	__be32 *p;
+
+	if (oa->count != 0)
+		return -EINVAL;
+
+	p = xdr_reserve_space(xdr, 4);
+	if (!p)
+		return -ENOSPC;
+	*p = 0;
+
+	return 0;
+}
+
+static int dummy_dec_opt_array(struct xdr_stream *xdr,
+				struct gssx_option_array *oa)
+{
+	struct gssx_option dummy;
+	u32 count, i;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	count = be32_to_cpup(p++);
+	memset(&dummy, 0, sizeof(dummy));
+	for (i = 0; i < count; i++) {
+		gssx_dec_option(xdr, &dummy);
+	}
+
+	oa->count = 0;
+	oa->data = NULL;
+	return 0;
+}
+
+static int get_host_u32(struct xdr_stream *xdr, u32 *res)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (!p)
+		return -EINVAL;
+	/* Contents of linux creds are all host-endian: */
+	memcpy(res, p, sizeof(u32));
+	return 0;
+}
+
+static int gssx_dec_linux_creds(struct xdr_stream *xdr,
+				struct svc_cred *creds)
+{
+	u32 length;
+	__be32 *p;
+	u32 tmp;
+	u32 N;
+	int i, err;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+
+	length = be32_to_cpup(p);
+
+	if (length > (3 + NGROUPS_MAX) * sizeof(u32))
+		return -ENOSPC;
+
+	/* uid */
+	err = get_host_u32(xdr, &tmp);
+	if (err)
+		return err;
+	creds->cr_uid = make_kuid(&init_user_ns, tmp);
+
+	/* gid */
+	err = get_host_u32(xdr, &tmp);
+	if (err)
+		return err;
+	creds->cr_gid = make_kgid(&init_user_ns, tmp);
+
+	/* number of additional gid's */
+	err = get_host_u32(xdr, &tmp);
+	if (err)
+		return err;
+	N = tmp;
+	if ((3 + N) * sizeof(u32) != length)
+		return -EINVAL;
+	creds->cr_group_info = groups_alloc(N);
+	if (creds->cr_group_info == NULL)
+		return -ENOMEM;
+
+	/* gid's */
+	for (i = 0; i < N; i++) {
+		kgid_t kgid;
+		err = get_host_u32(xdr, &tmp);
+		if (err)
+			goto out_free_groups;
+		err = -EINVAL;
+		kgid = make_kgid(&init_user_ns, tmp);
+		if (!gid_valid(kgid))
+			goto out_free_groups;
+		GROUP_AT(creds->cr_group_info, i) = kgid;
+	}
+
+	return 0;
+out_free_groups:
+	groups_free(creds->cr_group_info);
+	return err;
+}
+
+static int gssx_dec_option_array(struct xdr_stream *xdr,
+				 struct gssx_option_array *oa)
+{
+	struct svc_cred *creds;
+	u32 count, i;
+	__be32 *p;
+	int err;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	count = be32_to_cpup(p++);
+	if (!count)
+		return 0;
+
+	/* we recognize only 1 currently: CREDS_VALUE */
+	oa->count = 1;
+
+	oa->data = kmalloc(sizeof(struct gssx_option), GFP_KERNEL);
+	if (!oa->data)
+		return -ENOMEM;
+
+	creds = kmalloc(sizeof(struct svc_cred), GFP_KERNEL);
+	if (!creds) {
+		kfree(oa->data);
+		return -ENOMEM;
+	}
+
+	oa->data[0].option.data = CREDS_VALUE;
+	oa->data[0].option.len = sizeof(CREDS_VALUE);
+	oa->data[0].value.data = (void *)creds;
+	oa->data[0].value.len = 0;
+
+	for (i = 0; i < count; i++) {
+		gssx_buffer dummy = { 0, NULL };
+		u32 length;
+
+		/* option buffer */
+		p = xdr_inline_decode(xdr, 4);
+		if (unlikely(p == NULL))
+			return -ENOSPC;
+
+		length = be32_to_cpup(p);
+		p = xdr_inline_decode(xdr, length);
+		if (unlikely(p == NULL))
+			return -ENOSPC;
+
+		if (length == sizeof(CREDS_VALUE) &&
+		    memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {
+			/* We have creds here. parse them */
+			err = gssx_dec_linux_creds(xdr, creds);
+			if (err)
+				return err;
+			oa->data[0].value.len = 1; /* presence */
+		} else {
+			/* consume uninteresting buffer */
+			err = gssx_dec_buffer(xdr, &dummy);
+			if (err)
+				return err;
+		}
+	}
+	return 0;
+}
+
+static int gssx_dec_status(struct xdr_stream *xdr,
+			   struct gssx_status *status)
+{
+	__be32 *p;
+	int err;
+
+	/* status->major_status */
+	p = xdr_inline_decode(xdr, 8);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	p = xdr_decode_hyper(p, &status->major_status);
+
+	/* status->mech */
+	err = gssx_dec_buffer(xdr, &status->mech);
+	if (err)
+		return err;
+
+	/* status->minor_status */
+	p = xdr_inline_decode(xdr, 8);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	p = xdr_decode_hyper(p, &status->minor_status);
+
+	/* status->major_status_string */
+	err = gssx_dec_buffer(xdr, &status->major_status_string);
+	if (err)
+		return err;
+
+	/* status->minor_status_string */
+	err = gssx_dec_buffer(xdr, &status->minor_status_string);
+	if (err)
+		return err;
+
+	/* status->server_ctx */
+	err = gssx_dec_buffer(xdr, &status->server_ctx);
+	if (err)
+		return err;
+
+	/* we assume we have no options for now, so simply consume them */
+	/* status->options */
+	err = dummy_dec_opt_array(xdr, &status->options);
+
+	return err;
+}
+
+static int gssx_enc_call_ctx(struct xdr_stream *xdr,
+			     struct gssx_call_ctx *ctx)
+{
+	struct gssx_option opt;
+	__be32 *p;
+	int err;
+
+	/* ctx->locale */
+	err = gssx_enc_buffer(xdr, &ctx->locale);
+	if (err)
+		return err;
+
+	/* ctx->server_ctx */
+	err = gssx_enc_buffer(xdr, &ctx->server_ctx);
+	if (err)
+		return err;
+
+	/* we always want to ask for lucid contexts */
+	/* ctx->options */
+	p = xdr_reserve_space(xdr, 4);
+	*p = cpu_to_be32(2);
+
+	/* we want a lucid_v1 context */
+	opt.option.data = LUCID_OPTION;
+	opt.option.len = sizeof(LUCID_OPTION);
+	opt.value.data = LUCID_VALUE;
+	opt.value.len = sizeof(LUCID_VALUE);
+	err = gssx_enc_option(xdr, &opt);
+
+	/* ..and user creds */
+	opt.option.data = CREDS_OPTION;
+	opt.option.len = sizeof(CREDS_OPTION);
+	opt.value.data = CREDS_VALUE;
+	opt.value.len = sizeof(CREDS_VALUE);
+	err = gssx_enc_option(xdr, &opt);
+
+	return err;
+}
+
+static int gssx_dec_name_attr(struct xdr_stream *xdr,
+			     struct gssx_name_attr *attr)
+{
+	int err;
+
+	/* attr->attr */
+	err = gssx_dec_buffer(xdr, &attr->attr);
+	if (err)
+		return err;
+
+	/* attr->value */
+	err = gssx_dec_buffer(xdr, &attr->value);
+	if (err)
+		return err;
+
+	/* attr->extensions */
+	err = dummy_dec_opt_array(xdr, &attr->extensions);
+
+	return err;
+}
+
+static int dummy_enc_nameattr_array(struct xdr_stream *xdr,
+				    struct gssx_name_attr_array *naa)
+{
+	__be32 *p;
+
+	if (naa->count != 0)
+		return -EINVAL;
+
+	p = xdr_reserve_space(xdr, 4);
+	if (!p)
+		return -ENOSPC;
+	*p = 0;
+
+	return 0;
+}
+
+static int dummy_dec_nameattr_array(struct xdr_stream *xdr,
+				    struct gssx_name_attr_array *naa)
+{
+	struct gssx_name_attr dummy = { .attr = {.len = 0} };
+	u32 count, i;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	count = be32_to_cpup(p++);
+	for (i = 0; i < count; i++) {
+		gssx_dec_name_attr(xdr, &dummy);
+	}
+
+	naa->count = 0;
+	naa->data = NULL;
+	return 0;
+}
+
+static struct xdr_netobj zero_netobj = {};
+
+static struct gssx_name_attr_array zero_name_attr_array = {};
+
+static struct gssx_option_array zero_option_array = {};
+
+static int gssx_enc_name(struct xdr_stream *xdr,
+			 struct gssx_name *name)
+{
+	int err;
+
+	/* name->display_name */
+	err = gssx_enc_buffer(xdr, &name->display_name);
+	if (err)
+		return err;
+
+	/* name->name_type */
+	err = gssx_enc_buffer(xdr, &zero_netobj);
+	if (err)
+		return err;
+
+	/* name->exported_name */
+	err = gssx_enc_buffer(xdr, &zero_netobj);
+	if (err)
+		return err;
+
+	/* name->exported_composite_name */
+	err = gssx_enc_buffer(xdr, &zero_netobj);
+	if (err)
+		return err;
+
+	/* leave name_attributes empty for now, will add once we have any
+	 * to pass up at all */
+	/* name->name_attributes */
+	err = dummy_enc_nameattr_array(xdr, &zero_name_attr_array);
+	if (err)
+		return err;
+
+	/* leave options empty for now, will add once we have any options
+	 * to pass up at all */
+	/* name->extensions */
+	err = dummy_enc_opt_array(xdr, &zero_option_array);
+
+	return err;
+}
+
+
+static int gssx_dec_name(struct xdr_stream *xdr,
+			 struct gssx_name *name)
+{
+	struct xdr_netobj dummy_netobj = { .len = 0 };
+	struct gssx_name_attr_array dummy_name_attr_array = { .count = 0 };
+	struct gssx_option_array dummy_option_array = { .count = 0 };
+	int err;
+
+	/* name->display_name */
+	err = gssx_dec_buffer(xdr, &name->display_name);
+	if (err)
+		return err;
+
+	/* name->name_type */
+	err = gssx_dec_buffer(xdr, &dummy_netobj);
+	if (err)
+		return err;
+
+	/* name->exported_name */
+	err = gssx_dec_buffer(xdr, &dummy_netobj);
+	if (err)
+		return err;
+
+	/* name->exported_composite_name */
+	err = gssx_dec_buffer(xdr, &dummy_netobj);
+	if (err)
+		return err;
+
+	/* we assume we have no attributes for now, so simply consume them */
+	/* name->name_attributes */
+	err = dummy_dec_nameattr_array(xdr, &dummy_name_attr_array);
+	if (err)
+		return err;
+
+	/* we assume we have no options for now, so simply consume them */
+	/* name->extensions */
+	err = dummy_dec_opt_array(xdr, &dummy_option_array);
+
+	return err;
+}
+
+static int dummy_enc_credel_array(struct xdr_stream *xdr,
+				  struct gssx_cred_element_array *cea)
+{
+	__be32 *p;
+
+	if (cea->count != 0)
+		return -EINVAL;
+
+	p = xdr_reserve_space(xdr, 4);
+	if (!p)
+		return -ENOSPC;
+	*p = 0;
+
+	return 0;
+}
+
+static int gssx_enc_cred(struct xdr_stream *xdr,
+			 struct gssx_cred *cred)
+{
+	int err;
+
+	/* cred->desired_name */
+	err = gssx_enc_name(xdr, &cred->desired_name);
+	if (err)
+		return err;
+
+	/* cred->elements */
+	err = dummy_enc_credel_array(xdr, &cred->elements);
+	if (err)
+		return err;
+
+	/* cred->cred_handle_reference */
+	err = gssx_enc_buffer(xdr, &cred->cred_handle_reference);
+	if (err)
+		return err;
+
+	/* cred->needs_release */
+	err = gssx_enc_bool(xdr, cred->needs_release);
+
+	return err;
+}
+
+static int gssx_enc_ctx(struct xdr_stream *xdr,
+			struct gssx_ctx *ctx)
+{
+	__be32 *p;
+	int err;
+
+	/* ctx->exported_context_token */
+	err = gssx_enc_buffer(xdr, &ctx->exported_context_token);
+	if (err)
+		return err;
+
+	/* ctx->state */
+	err = gssx_enc_buffer(xdr, &ctx->state);
+	if (err)
+		return err;
+
+	/* ctx->need_release */
+	err = gssx_enc_bool(xdr, ctx->need_release);
+	if (err)
+		return err;
+
+	/* ctx->mech */
+	err = gssx_enc_buffer(xdr, &ctx->mech);
+	if (err)
+		return err;
+
+	/* ctx->src_name */
+	err = gssx_enc_name(xdr, &ctx->src_name);
+	if (err)
+		return err;
+
+	/* ctx->targ_name */
+	err = gssx_enc_name(xdr, &ctx->targ_name);
+	if (err)
+		return err;
+
+	/* ctx->lifetime */
+	p = xdr_reserve_space(xdr, 8+8);
+	if (!p)
+		return -ENOSPC;
+	p = xdr_encode_hyper(p, ctx->lifetime);
+
+	/* ctx->ctx_flags */
+	p = xdr_encode_hyper(p, ctx->ctx_flags);
+
+	/* ctx->locally_initiated */
+	err = gssx_enc_bool(xdr, ctx->locally_initiated);
+	if (err)
+		return err;
+
+	/* ctx->open */
+	err = gssx_enc_bool(xdr, ctx->open);
+	if (err)
+		return err;
+
+	/* leave options empty for now, will add once we have any options
+	 * to pass up at all */
+	/* ctx->options */
+	err = dummy_enc_opt_array(xdr, &ctx->options);
+
+	return err;
+}
+
+static int gssx_dec_ctx(struct xdr_stream *xdr,
+			struct gssx_ctx *ctx)
+{
+	__be32 *p;
+	int err;
+
+	/* ctx->exported_context_token */
+	err = gssx_dec_buffer(xdr, &ctx->exported_context_token);
+	if (err)
+		return err;
+
+	/* ctx->state */
+	err = gssx_dec_buffer(xdr, &ctx->state);
+	if (err)
+		return err;
+
+	/* ctx->need_release */
+	err = gssx_dec_bool(xdr, &ctx->need_release);
+	if (err)
+		return err;
+
+	/* ctx->mech */
+	err = gssx_dec_buffer(xdr, &ctx->mech);
+	if (err)
+		return err;
+
+	/* ctx->src_name */
+	err = gssx_dec_name(xdr, &ctx->src_name);
+	if (err)
+		return err;
+
+	/* ctx->targ_name */
+	err = gssx_dec_name(xdr, &ctx->targ_name);
+	if (err)
+		return err;
+
+	/* ctx->lifetime */
+	p = xdr_inline_decode(xdr, 8+8);
+	if (unlikely(p == NULL))
+		return -ENOSPC;
+	p = xdr_decode_hyper(p, &ctx->lifetime);
+
+	/* ctx->ctx_flags */
+	p = xdr_decode_hyper(p, &ctx->ctx_flags);
+
+	/* ctx->locally_initiated */
+	err = gssx_dec_bool(xdr, &ctx->locally_initiated);
+	if (err)
+		return err;
+
+	/* ctx->open */
+	err = gssx_dec_bool(xdr, &ctx->open);
+	if (err)
+		return err;
+
+	/* we assume we have no options for now, so simply consume them */
+	/* ctx->options */
+	err = dummy_dec_opt_array(xdr, &ctx->options);
+
+	return err;
+}
+
+static int gssx_enc_cb(struct xdr_stream *xdr, struct gssx_cb *cb)
+{
+	__be32 *p;
+	int err;
+
+	/* cb->initiator_addrtype */
+	p = xdr_reserve_space(xdr, 8);
+	if (!p)
+		return -ENOSPC;
+	p = xdr_encode_hyper(p, cb->initiator_addrtype);
+
+	/* cb->initiator_address */
+	err = gssx_enc_buffer(xdr, &cb->initiator_address);
+	if (err)
+		return err;
+
+	/* cb->acceptor_addrtype */
+	p = xdr_reserve_space(xdr, 8);
+	if (!p)
+		return -ENOSPC;
+	p = xdr_encode_hyper(p, cb->acceptor_addrtype);
+
+	/* cb->acceptor_address */
+	err = gssx_enc_buffer(xdr, &cb->acceptor_address);
+	if (err)
+		return err;
+
+	/* cb->application_data */
+	err = gssx_enc_buffer(xdr, &cb->application_data);
+
+	return err;
+}
+
+void gssx_enc_accept_sec_context(struct rpc_rqst *req,
+				 struct xdr_stream *xdr,
+				 struct gssx_arg_accept_sec_context *arg)
+{
+	int err;
+
+	err = gssx_enc_call_ctx(xdr, &arg->call_ctx);
+	if (err)
+		goto done;
+
+	/* arg->context_handle */
+	if (arg->context_handle)
+		err = gssx_enc_ctx(xdr, arg->context_handle);
+	else
+		err = gssx_enc_bool(xdr, 0);
+	if (err)
+		goto done;
+
+	/* arg->cred_handle */
+	if (arg->cred_handle)
+		err = gssx_enc_cred(xdr, arg->cred_handle);
+	else
+		err = gssx_enc_bool(xdr, 0);
+	if (err)
+		goto done;
+
+	/* arg->input_token */
+	err = gssx_enc_in_token(xdr, &arg->input_token);
+	if (err)
+		goto done;
+
+	/* arg->input_cb */
+	if (arg->input_cb)
+		err = gssx_enc_cb(xdr, arg->input_cb);
+	else
+		err = gssx_enc_bool(xdr, 0);
+	if (err)
+		goto done;
+
+	err = gssx_enc_bool(xdr, arg->ret_deleg_cred);
+	if (err)
+		goto done;
+
+	/* leave options empty for now, will add once we have any options
+	 * to pass up at all */
+	/* arg->options */
+	err = dummy_enc_opt_array(xdr, &arg->options);
+
+	xdr_inline_pages(&req->rq_rcv_buf,
+		PAGE_SIZE/2 /* pretty arbitrary */,
+		arg->pages, 0 /* page base */, arg->npages * PAGE_SIZE);
+done:
+	if (err)
+		dprintk("RPC:       gssx_enc_accept_sec_context: %d\n", err);
+}
+
+int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
+				struct xdr_stream *xdr,
+				struct gssx_res_accept_sec_context *res)
+{
+	u32 value_follows;
+	int err;
+	struct page *scratch;
+
+	scratch = alloc_page(GFP_KERNEL);
+	if (!scratch)
+		return -ENOMEM;
+	xdr_set_scratch_buffer(xdr, page_address(scratch), PAGE_SIZE);
+
+	/* res->status */
+	err = gssx_dec_status(xdr, &res->status);
+	if (err)
+		goto out_free;
+
+	/* res->context_handle */
+	err = gssx_dec_bool(xdr, &value_follows);
+	if (err)
+		goto out_free;
+	if (value_follows) {
+		err = gssx_dec_ctx(xdr, res->context_handle);
+		if (err)
+			goto out_free;
+	} else {
+		res->context_handle = NULL;
+	}
+
+	/* res->output_token */
+	err = gssx_dec_bool(xdr, &value_follows);
+	if (err)
+		goto out_free;
+	if (value_follows) {
+		err = gssx_dec_buffer(xdr, res->output_token);
+		if (err)
+			goto out_free;
+	} else {
+		res->output_token = NULL;
+	}
+
+	/* res->delegated_cred_handle */
+	err = gssx_dec_bool(xdr, &value_follows);
+	if (err)
+		goto out_free;
+	if (value_follows) {
+		/* we do not support upcall servers sending this data. */
+		err = -EINVAL;
+		goto out_free;
+	}
+
+	/* res->options */
+	err = gssx_dec_option_array(xdr, &res->options);
+
+out_free:
+	__free_page(scratch);
+	return err;
+}
diff --git a/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.h b/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.h
new file mode 100644
index 000000000..9d88c6239
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/gss_rpc_xdr.h
@@ -0,0 +1,267 @@
+/*
+ * GSS Proxy upcall module
+ *
+ *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _LINUX_GSS_RPC_XDR_H
+#define _LINUX_GSS_RPC_XDR_H
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/xprtsock.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define LUCID_OPTION "exported_context_type"
+#define LUCID_VALUE  "linux_lucid_v1"
+#define CREDS_OPTION "exported_creds_type"
+#define CREDS_VALUE  "linux_creds_v1"
+
+typedef struct xdr_netobj gssx_buffer;
+typedef struct xdr_netobj utf8string;
+typedef struct xdr_netobj gssx_OID;
+
+enum gssx_cred_usage {
+	GSSX_C_INITIATE = 1,
+	GSSX_C_ACCEPT = 2,
+	GSSX_C_BOTH = 3,
+};
+
+struct gssx_option {
+	gssx_buffer option;
+	gssx_buffer value;
+};
+
+struct gssx_option_array {
+	u32 count;
+	struct gssx_option *data;
+};
+
+struct gssx_status {
+	u64 major_status;
+	gssx_OID mech;
+	u64 minor_status;
+	utf8string major_status_string;
+	utf8string minor_status_string;
+	gssx_buffer server_ctx;
+	struct gssx_option_array options;
+};
+
+struct gssx_call_ctx {
+	utf8string locale;
+	gssx_buffer server_ctx;
+	struct gssx_option_array options;
+};
+
+struct gssx_name_attr {
+	gssx_buffer attr;
+	gssx_buffer value;
+	struct gssx_option_array extensions;
+};
+
+struct gssx_name_attr_array {
+	u32 count;
+	struct gssx_name_attr *data;
+};
+
+struct gssx_name {
+	gssx_buffer display_name;
+};
+typedef struct gssx_name gssx_name;
+
+struct gssx_cred_element {
+	gssx_name MN;
+	gssx_OID mech;
+	u32 cred_usage;
+	u64 initiator_time_rec;
+	u64 acceptor_time_rec;
+	struct gssx_option_array options;
+};
+
+struct gssx_cred_element_array {
+	u32 count;
+	struct gssx_cred_element *data;
+};
+
+struct gssx_cred {
+	gssx_name desired_name;
+	struct gssx_cred_element_array elements;
+	gssx_buffer cred_handle_reference;
+	u32 needs_release;
+};
+
+struct gssx_ctx {
+	gssx_buffer exported_context_token;
+	gssx_buffer state;
+	u32 need_release;
+	gssx_OID mech;
+	gssx_name src_name;
+	gssx_name targ_name;
+	u64 lifetime;
+	u64 ctx_flags;
+	u32 locally_initiated;
+	u32 open;
+	struct gssx_option_array options;
+};
+
+struct gssx_cb {
+	u64 initiator_addrtype;
+	gssx_buffer initiator_address;
+	u64 acceptor_addrtype;
+	gssx_buffer acceptor_address;
+	gssx_buffer application_data;
+};
+
+
+/* This structure is not defined in the protocol.
+ * It is used in the kernel to carry around a big buffer
+ * as a set of pages */
+struct gssp_in_token {
+	struct page **pages;	/* Array of contiguous pages */
+	unsigned int page_base;	/* Start of page data */
+	unsigned int page_len;	/* Length of page data */
+};
+
+struct gssx_arg_accept_sec_context {
+	struct gssx_call_ctx call_ctx;
+	struct gssx_ctx *context_handle;
+	struct gssx_cred *cred_handle;
+	struct gssp_in_token input_token;
+	struct gssx_cb *input_cb;
+	u32 ret_deleg_cred;
+	struct gssx_option_array options;
+	struct page **pages;
+	unsigned int npages;
+};
+
+struct gssx_res_accept_sec_context {
+	struct gssx_status status;
+	struct gssx_ctx *context_handle;
+	gssx_buffer *output_token;
+	/* struct gssx_cred *delegated_cred_handle; not used in kernel */
+	struct gssx_option_array options;
+};
+
+
+
+#define gssx_enc_indicate_mechs NULL
+#define gssx_dec_indicate_mechs NULL
+#define gssx_enc_get_call_context NULL
+#define gssx_dec_get_call_context NULL
+#define gssx_enc_import_and_canon_name NULL
+#define gssx_dec_import_and_canon_name NULL
+#define gssx_enc_export_cred NULL
+#define gssx_dec_export_cred NULL
+#define gssx_enc_import_cred NULL
+#define gssx_dec_import_cred NULL
+#define gssx_enc_acquire_cred NULL
+#define gssx_dec_acquire_cred NULL
+#define gssx_enc_store_cred NULL
+#define gssx_dec_store_cred NULL
+#define gssx_enc_init_sec_context NULL
+#define gssx_dec_init_sec_context NULL
+void gssx_enc_accept_sec_context(struct rpc_rqst *req,
+				 struct xdr_stream *xdr,
+				 struct gssx_arg_accept_sec_context *args);
+int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
+				struct xdr_stream *xdr,
+				struct gssx_res_accept_sec_context *res);
+#define gssx_enc_release_handle NULL
+#define gssx_dec_release_handle NULL
+#define gssx_enc_get_mic NULL
+#define gssx_dec_get_mic NULL
+#define gssx_enc_verify NULL
+#define gssx_dec_verify NULL
+#define gssx_enc_wrap NULL
+#define gssx_dec_wrap NULL
+#define gssx_enc_unwrap NULL
+#define gssx_dec_unwrap NULL
+#define gssx_enc_wrap_size_limit NULL
+#define gssx_dec_wrap_size_limit NULL
+
+/* non implemented calls are set to 0 size */
+#define GSSX_ARG_indicate_mechs_sz 0
+#define GSSX_RES_indicate_mechs_sz 0
+#define GSSX_ARG_get_call_context_sz 0
+#define GSSX_RES_get_call_context_sz 0
+#define GSSX_ARG_import_and_canon_name_sz 0
+#define GSSX_RES_import_and_canon_name_sz 0
+#define GSSX_ARG_export_cred_sz 0
+#define GSSX_RES_export_cred_sz 0
+#define GSSX_ARG_import_cred_sz 0
+#define GSSX_RES_import_cred_sz 0
+#define GSSX_ARG_acquire_cred_sz 0
+#define GSSX_RES_acquire_cred_sz 0
+#define GSSX_ARG_store_cred_sz 0
+#define GSSX_RES_store_cred_sz 0
+#define GSSX_ARG_init_sec_context_sz 0
+#define GSSX_RES_init_sec_context_sz 0
+
+#define GSSX_default_in_call_ctx_sz (4 + 4 + 4 + \
+			8 + sizeof(LUCID_OPTION) + sizeof(LUCID_VALUE) + \
+			8 + sizeof(CREDS_OPTION) + sizeof(CREDS_VALUE))
+#define GSSX_default_in_ctx_hndl_sz (4 + 4+8 + 4 + 4 + 6*4 + 6*4 + 8 + 8 + \
+					4 + 4 + 4)
+#define GSSX_default_in_cred_sz 4 /* we send in no cred_handle */
+#define GSSX_default_in_token_sz 4 /* does *not* include token data */
+#define GSSX_default_in_cb_sz 4 /* we do not use channel bindings */
+#define GSSX_ARG_accept_sec_context_sz (GSSX_default_in_call_ctx_sz + \
+					GSSX_default_in_ctx_hndl_sz + \
+					GSSX_default_in_cred_sz + \
+					GSSX_default_in_token_sz + \
+					GSSX_default_in_cb_sz + \
+					4 /* no deleg creds boolean */ + \
+					4) /* empty options */
+
+/* somewhat arbitrary numbers but large enough (we ignore some of the data
+ * sent down, but it is part of the protocol so we need enough space to take
+ * it in) */
+#define GSSX_default_status_sz 8 + 24 + 8 + 256 + 256 + 16 + 4
+#define GSSX_max_output_handle_sz 128
+#define GSSX_max_oid_sz 16
+#define GSSX_max_princ_sz 256
+#define GSSX_default_ctx_sz (GSSX_max_output_handle_sz + \
+			     16 + 4 + GSSX_max_oid_sz + \
+			     2 * GSSX_max_princ_sz + \
+			     8 + 8 + 4 + 4 + 4)
+#define GSSX_max_output_token_sz 1024
+/* grouplist not included; we allocate separate pages for that: */
+#define GSSX_max_creds_sz (4 + 4 + 4 /* + NGROUPS_MAX*4 */)
+#define GSSX_RES_accept_sec_context_sz (GSSX_default_status_sz + \
+					GSSX_default_ctx_sz + \
+					GSSX_max_output_token_sz + \
+					4 + GSSX_max_creds_sz)
+
+#define GSSX_ARG_release_handle_sz 0
+#define GSSX_RES_release_handle_sz 0
+#define GSSX_ARG_get_mic_sz 0
+#define GSSX_RES_get_mic_sz 0
+#define GSSX_ARG_verify_sz 0
+#define GSSX_RES_verify_sz 0
+#define GSSX_ARG_wrap_sz 0
+#define GSSX_RES_wrap_sz 0
+#define GSSX_ARG_unwrap_sz 0
+#define GSSX_RES_unwrap_sz 0
+#define GSSX_ARG_wrap_size_limit_sz 0
+#define GSSX_RES_wrap_size_limit_sz 0
+
+
+
+#endif /* _LINUX_GSS_RPC_XDR_H */
diff --git a/kernel/net/sunrpc/auth_gss/svcauth_gss.c b/kernel/net/sunrpc/auth_gss/svcauth_gss.c
new file mode 100644
index 000000000..1095be9c8
--- /dev/null
+++ b/kernel/net/sunrpc/auth_gss/svcauth_gss.c
@@ -0,0 +1,1862 @@
+/*
+ * Neil Brown <neilb@cse.unsw.edu.au>
+ * J. Bruce Fields <bfields@umich.edu>
+ * Andy Adamson <andros@umich.edu>
+ * Dug Song <dugsong@monkey.org>
+ *
+ * RPCSEC_GSS server authentication.
+ * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
+ * (gssapi)
+ *
+ * The RPCSEC_GSS involves three stages:
+ *  1/ context creation
+ *  2/ data exchange
+ *  3/ context destruction
+ *
+ * Context creation is handled largely by upcalls to user-space.
+ *  In particular, GSS_Accept_sec_context is handled by an upcall
+ * Data exchange is handled entirely within the kernel
+ *  In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
+ * Context destruction is handled in-kernel
+ *  GSS_Delete_sec_context is in-kernel
+ *
+ * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
+ * The context handle and gss_token are used as a key into the rpcsec_init cache.
+ * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
+ * being major_status, minor_status, context_handle, reply_token.
+ * These are sent back to the client.
+ * Sequence window management is handled by the kernel.  The window size if currently
+ * a compile time constant.
+ *
+ * When user-space is happy that a context is established, it places an entry
+ * in the rpcsec_context cache. The key for this cache is the context_handle.
+ * The content includes:
+ *   uid/gidlist - for determining access rights
+ *   mechanism type
+ *   mechanism specific information, such as a key
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/user_namespace.h>
+
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/cache.h>
+#include "gss_rpc_upcall.h"
+
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
+ * into replies.
+ *
+ * Key is context handle (\x if empty) and gss_token.
+ * Content is major_status minor_status (integers) context_handle, reply_token.
+ *
+ */
+
+static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
+{
+	return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
+}
+
+#define	RSI_HASHBITS	6
+#define	RSI_HASHMAX	(1<<RSI_HASHBITS)
+
+struct rsi {
+	struct cache_head	h;
+	struct xdr_netobj	in_handle, in_token;
+	struct xdr_netobj	out_handle, out_token;
+	int			major_status, minor_status;
+};
+
+static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
+static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
+
+static void rsi_free(struct rsi *rsii)
+{
+	kfree(rsii->in_handle.data);
+	kfree(rsii->in_token.data);
+	kfree(rsii->out_handle.data);
+	kfree(rsii->out_token.data);
+}
+
+static void rsi_put(struct kref *ref)
+{
+	struct rsi *rsii = container_of(ref, struct rsi, h.ref);
+	rsi_free(rsii);
+	kfree(rsii);
+}
+
+static inline int rsi_hash(struct rsi *item)
+{
+	return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
+	     ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
+}
+
+static int rsi_match(struct cache_head *a, struct cache_head *b)
+{
+	struct rsi *item = container_of(a, struct rsi, h);
+	struct rsi *tmp = container_of(b, struct rsi, h);
+	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
+	       netobj_equal(&item->in_token, &tmp->in_token);
+}
+
+static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
+{
+	dst->len = len;
+	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
+	if (len && !dst->data)
+		return -ENOMEM;
+	return 0;
+}
+
+static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
+{
+	return dup_to_netobj(dst, src->data, src->len);
+}
+
+static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct rsi *new = container_of(cnew, struct rsi, h);
+	struct rsi *item = container_of(citem, struct rsi, h);
+
+	new->out_handle.data = NULL;
+	new->out_handle.len = 0;
+	new->out_token.data = NULL;
+	new->out_token.len = 0;
+	new->in_handle.len = item->in_handle.len;
+	item->in_handle.len = 0;
+	new->in_token.len = item->in_token.len;
+	item->in_token.len = 0;
+	new->in_handle.data = item->in_handle.data;
+	item->in_handle.data = NULL;
+	new->in_token.data = item->in_token.data;
+	item->in_token.data = NULL;
+}
+
+static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct rsi *new = container_of(cnew, struct rsi, h);
+	struct rsi *item = container_of(citem, struct rsi, h);
+
+	BUG_ON(new->out_handle.data || new->out_token.data);
+	new->out_handle.len = item->out_handle.len;
+	item->out_handle.len = 0;
+	new->out_token.len = item->out_token.len;
+	item->out_token.len = 0;
+	new->out_handle.data = item->out_handle.data;
+	item->out_handle.data = NULL;
+	new->out_token.data = item->out_token.data;
+	item->out_token.data = NULL;
+
+	new->major_status = item->major_status;
+	new->minor_status = item->minor_status;
+}
+
+static struct cache_head *rsi_alloc(void)
+{
+	struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
+	if (rsii)
+		return &rsii->h;
+	else
+		return NULL;
+}
+
+static void rsi_request(struct cache_detail *cd,
+		       struct cache_head *h,
+		       char **bpp, int *blen)
+{
+	struct rsi *rsii = container_of(h, struct rsi, h);
+
+	qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
+	qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
+	(*bpp)[-1] = '\n';
+}
+
+static int rsi_parse(struct cache_detail *cd,
+		    char *mesg, int mlen)
+{
+	/* context token expiry major minor context token */
+	char *buf = mesg;
+	char *ep;
+	int len;
+	struct rsi rsii, *rsip = NULL;
+	time_t expiry;
+	int status = -EINVAL;
+
+	memset(&rsii, 0, sizeof(rsii));
+	/* handle */
+	len = qword_get(&mesg, buf, mlen);
+	if (len < 0)
+		goto out;
+	status = -ENOMEM;
+	if (dup_to_netobj(&rsii.in_handle, buf, len))
+		goto out;
+
+	/* token */
+	len = qword_get(&mesg, buf, mlen);
+	status = -EINVAL;
+	if (len < 0)
+		goto out;
+	status = -ENOMEM;
+	if (dup_to_netobj(&rsii.in_token, buf, len))
+		goto out;
+
+	rsip = rsi_lookup(cd, &rsii);
+	if (!rsip)
+		goto out;
+
+	rsii.h.flags = 0;
+	/* expiry */
+	expiry = get_expiry(&mesg);
+	status = -EINVAL;
+	if (expiry == 0)
+		goto out;
+
+	/* major/minor */
+	len = qword_get(&mesg, buf, mlen);
+	if (len <= 0)
+		goto out;
+	rsii.major_status = simple_strtoul(buf, &ep, 10);
+	if (*ep)
+		goto out;
+	len = qword_get(&mesg, buf, mlen);
+	if (len <= 0)
+		goto out;
+	rsii.minor_status = simple_strtoul(buf, &ep, 10);
+	if (*ep)
+		goto out;
+
+	/* out_handle */
+	len = qword_get(&mesg, buf, mlen);
+	if (len < 0)
+		goto out;
+	status = -ENOMEM;
+	if (dup_to_netobj(&rsii.out_handle, buf, len))
+		goto out;
+
+	/* out_token */
+	len = qword_get(&mesg, buf, mlen);
+	status = -EINVAL;
+	if (len < 0)
+		goto out;
+	status = -ENOMEM;
+	if (dup_to_netobj(&rsii.out_token, buf, len))
+		goto out;
+	rsii.h.expiry_time = expiry;
+	rsip = rsi_update(cd, &rsii, rsip);
+	status = 0;
+out:
+	rsi_free(&rsii);
+	if (rsip)
+		cache_put(&rsip->h, cd);
+	else
+		status = -ENOMEM;
+	return status;
+}
+
+static struct cache_detail rsi_cache_template = {
+	.owner		= THIS_MODULE,
+	.hash_size	= RSI_HASHMAX,
+	.name           = "auth.rpcsec.init",
+	.cache_put      = rsi_put,
+	.cache_request  = rsi_request,
+	.cache_parse    = rsi_parse,
+	.match		= rsi_match,
+	.init		= rsi_init,
+	.update		= update_rsi,
+	.alloc		= rsi_alloc,
+};
+
+static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
+{
+	struct cache_head *ch;
+	int hash = rsi_hash(item);
+
+	ch = sunrpc_cache_lookup(cd, &item->h, hash);
+	if (ch)
+		return container_of(ch, struct rsi, h);
+	else
+		return NULL;
+}
+
+static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
+{
+	struct cache_head *ch;
+	int hash = rsi_hash(new);
+
+	ch = sunrpc_cache_update(cd, &new->h,
+				 &old->h, hash);
+	if (ch)
+		return container_of(ch, struct rsi, h);
+	else
+		return NULL;
+}
+
+
+/*
+ * The rpcsec_context cache is used to store a context that is
+ * used in data exchange.
+ * The key is a context handle. The content is:
+ *  uid, gidlist, mechanism, service-set, mech-specific-data
+ */
+
+#define	RSC_HASHBITS	10
+#define	RSC_HASHMAX	(1<<RSC_HASHBITS)
+
+#define GSS_SEQ_WIN	128
+
+struct gss_svc_seq_data {
+	/* highest seq number seen so far: */
+	int			sd_max;
+	/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
+	 * sd_win is nonzero iff sequence number i has been seen already: */
+	unsigned long		sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
+	spinlock_t		sd_lock;
+};
+
+struct rsc {
+	struct cache_head	h;
+	struct xdr_netobj	handle;
+	struct svc_cred		cred;
+	struct gss_svc_seq_data	seqdata;
+	struct gss_ctx		*mechctx;
+};
+
+static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
+static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
+
+static void rsc_free(struct rsc *rsci)
+{
+	kfree(rsci->handle.data);
+	if (rsci->mechctx)
+		gss_delete_sec_context(&rsci->mechctx);
+	free_svc_cred(&rsci->cred);
+}
+
+static void rsc_put(struct kref *ref)
+{
+	struct rsc *rsci = container_of(ref, struct rsc, h.ref);
+
+	rsc_free(rsci);
+	kfree(rsci);
+}
+
+static inline int
+rsc_hash(struct rsc *rsci)
+{
+	return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
+}
+
+static int
+rsc_match(struct cache_head *a, struct cache_head *b)
+{
+	struct rsc *new = container_of(a, struct rsc, h);
+	struct rsc *tmp = container_of(b, struct rsc, h);
+
+	return netobj_equal(&new->handle, &tmp->handle);
+}
+
+static void
+rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
+{
+	struct rsc *new = container_of(cnew, struct rsc, h);
+	struct rsc *tmp = container_of(ctmp, struct rsc, h);
+
+	new->handle.len = tmp->handle.len;
+	tmp->handle.len = 0;
+	new->handle.data = tmp->handle.data;
+	tmp->handle.data = NULL;
+	new->mechctx = NULL;
+	init_svc_cred(&new->cred);
+}
+
+static void
+update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
+{
+	struct rsc *new = container_of(cnew, struct rsc, h);
+	struct rsc *tmp = container_of(ctmp, struct rsc, h);
+
+	new->mechctx = tmp->mechctx;
+	tmp->mechctx = NULL;
+	memset(&new->seqdata, 0, sizeof(new->seqdata));
+	spin_lock_init(&new->seqdata.sd_lock);
+	new->cred = tmp->cred;
+	init_svc_cred(&tmp->cred);
+}
+
+static struct cache_head *
+rsc_alloc(void)
+{
+	struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
+	if (rsci)
+		return &rsci->h;
+	else
+		return NULL;
+}
+
+static int rsc_parse(struct cache_detail *cd,
+		     char *mesg, int mlen)
+{
+	/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
+	char *buf = mesg;
+	int id;
+	int len, rv;
+	struct rsc rsci, *rscp = NULL;
+	time_t expiry;
+	int status = -EINVAL;
+	struct gss_api_mech *gm = NULL;
+
+	memset(&rsci, 0, sizeof(rsci));
+	/* context handle */
+	len = qword_get(&mesg, buf, mlen);
+	if (len < 0) goto out;
+	status = -ENOMEM;
+	if (dup_to_netobj(&rsci.handle, buf, len))
+		goto out;
+
+	rsci.h.flags = 0;
+	/* expiry */
+	expiry = get_expiry(&mesg);
+	status = -EINVAL;
+	if (expiry == 0)
+		goto out;
+
+	rscp = rsc_lookup(cd, &rsci);
+	if (!rscp)
+		goto out;
+
+	/* uid, or NEGATIVE */
+	rv = get_int(&mesg, &id);
+	if (rv == -EINVAL)
+		goto out;
+	if (rv == -ENOENT)
+		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
+	else {
+		int N, i;
+
+		/*
+		 * NOTE: we skip uid_valid()/gid_valid() checks here:
+		 * instead, * -1 id's are later mapped to the
+		 * (export-specific) anonymous id by nfsd_setuser.
+		 *
+		 * (But supplementary gid's get no such special
+		 * treatment so are checked for validity here.)
+		 */
+		/* uid */
+		rsci.cred.cr_uid = make_kuid(&init_user_ns, id);
+
+		/* gid */
+		if (get_int(&mesg, &id))
+			goto out;
+		rsci.cred.cr_gid = make_kgid(&init_user_ns, id);
+
+		/* number of additional gid's */
+		if (get_int(&mesg, &N))
+			goto out;
+		if (N < 0 || N > NGROUPS_MAX)
+			goto out;
+		status = -ENOMEM;
+		rsci.cred.cr_group_info = groups_alloc(N);
+		if (rsci.cred.cr_group_info == NULL)
+			goto out;
+
+		/* gid's */
+		status = -EINVAL;
+		for (i=0; i<N; i++) {
+			kgid_t kgid;
+			if (get_int(&mesg, &id))
+				goto out;
+			kgid = make_kgid(&init_user_ns, id);
+			if (!gid_valid(kgid))
+				goto out;
+			GROUP_AT(rsci.cred.cr_group_info, i) = kgid;
+		}
+
+		/* mech name */
+		len = qword_get(&mesg, buf, mlen);
+		if (len < 0)
+			goto out;
+		gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
+		status = -EOPNOTSUPP;
+		if (!gm)
+			goto out;
+
+		status = -EINVAL;
+		/* mech-specific data: */
+		len = qword_get(&mesg, buf, mlen);
+		if (len < 0)
+			goto out;
+		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
+						NULL, GFP_KERNEL);
+		if (status)
+			goto out;
+
+		/* get client name */
+		len = qword_get(&mesg, buf, mlen);
+		if (len > 0) {
+			rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
+			if (!rsci.cred.cr_principal) {
+				status = -ENOMEM;
+				goto out;
+			}
+		}
+
+	}
+	rsci.h.expiry_time = expiry;
+	rscp = rsc_update(cd, &rsci, rscp);
+	status = 0;
+out:
+	rsc_free(&rsci);
+	if (rscp)
+		cache_put(&rscp->h, cd);
+	else
+		status = -ENOMEM;
+	return status;
+}
+
+static struct cache_detail rsc_cache_template = {
+	.owner		= THIS_MODULE,
+	.hash_size	= RSC_HASHMAX,
+	.name		= "auth.rpcsec.context",
+	.cache_put	= rsc_put,
+	.cache_parse	= rsc_parse,
+	.match		= rsc_match,
+	.init		= rsc_init,
+	.update		= update_rsc,
+	.alloc		= rsc_alloc,
+};
+
+static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
+{
+	struct cache_head *ch;
+	int hash = rsc_hash(item);
+
+	ch = sunrpc_cache_lookup(cd, &item->h, hash);
+	if (ch)
+		return container_of(ch, struct rsc, h);
+	else
+		return NULL;
+}
+
+static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
+{
+	struct cache_head *ch;
+	int hash = rsc_hash(new);
+
+	ch = sunrpc_cache_update(cd, &new->h,
+				 &old->h, hash);
+	if (ch)
+		return container_of(ch, struct rsc, h);
+	else
+		return NULL;
+}
+
+
+static struct rsc *
+gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
+{
+	struct rsc rsci;
+	struct rsc *found;
+
+	memset(&rsci, 0, sizeof(rsci));
+	if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
+		return NULL;
+	found = rsc_lookup(cd, &rsci);
+	rsc_free(&rsci);
+	if (!found)
+		return NULL;
+	if (cache_check(cd, &found->h, NULL))
+		return NULL;
+	return found;
+}
+
+/* Implements sequence number algorithm as specified in RFC 2203. */
+static int
+gss_check_seq_num(struct rsc *rsci, int seq_num)
+{
+	struct gss_svc_seq_data *sd = &rsci->seqdata;
+
+	spin_lock(&sd->sd_lock);
+	if (seq_num > sd->sd_max) {
+		if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
+			memset(sd->sd_win,0,sizeof(sd->sd_win));
+			sd->sd_max = seq_num;
+		} else while (sd->sd_max < seq_num) {
+			sd->sd_max++;
+			__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
+		}
+		__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
+		goto ok;
+	} else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
+		goto drop;
+	}
+	/* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
+	if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
+		goto drop;
+ok:
+	spin_unlock(&sd->sd_lock);
+	return 1;
+drop:
+	spin_unlock(&sd->sd_lock);
+	return 0;
+}
+
+static inline u32 round_up_to_quad(u32 i)
+{
+	return (i + 3 ) & ~3;
+}
+
+static inline int
+svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
+{
+	int l;
+
+	if (argv->iov_len < 4)
+		return -1;
+	o->len = svc_getnl(argv);
+	l = round_up_to_quad(o->len);
+	if (argv->iov_len < l)
+		return -1;
+	o->data = argv->iov_base;
+	argv->iov_base += l;
+	argv->iov_len -= l;
+	return 0;
+}
+
+static inline int
+svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
+{
+	u8 *p;
+
+	if (resv->iov_len + 4 > PAGE_SIZE)
+		return -1;
+	svc_putnl(resv, o->len);
+	p = resv->iov_base + resv->iov_len;
+	resv->iov_len += round_up_to_quad(o->len);
+	if (resv->iov_len > PAGE_SIZE)
+		return -1;
+	memcpy(p, o->data, o->len);
+	memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
+	return 0;
+}
+
+/*
+ * Verify the checksum on the header and return SVC_OK on success.
+ * Otherwise, return SVC_DROP (in the case of a bad sequence number)
+ * or return SVC_DENIED and indicate error in authp.
+ */
+static int
+gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
+		  __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
+{
+	struct gss_ctx		*ctx_id = rsci->mechctx;
+	struct xdr_buf		rpchdr;
+	struct xdr_netobj	checksum;
+	u32			flavor = 0;
+	struct kvec		*argv = &rqstp->rq_arg.head[0];
+	struct kvec		iov;
+
+	/* data to compute the checksum over: */
+	iov.iov_base = rpcstart;
+	iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
+	xdr_buf_from_iov(&iov, &rpchdr);
+
+	*authp = rpc_autherr_badverf;
+	if (argv->iov_len < 4)
+		return SVC_DENIED;
+	flavor = svc_getnl(argv);
+	if (flavor != RPC_AUTH_GSS)
+		return SVC_DENIED;
+	if (svc_safe_getnetobj(argv, &checksum))
+		return SVC_DENIED;
+
+	if (rqstp->rq_deferred) /* skip verification of revisited request */
+		return SVC_OK;
+	if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
+		*authp = rpcsec_gsserr_credproblem;
+		return SVC_DENIED;
+	}
+
+	if (gc->gc_seq > MAXSEQ) {
+		dprintk("RPC:       svcauth_gss: discarding request with "
+				"large sequence number %d\n", gc->gc_seq);
+		*authp = rpcsec_gsserr_ctxproblem;
+		return SVC_DENIED;
+	}
+	if (!gss_check_seq_num(rsci, gc->gc_seq)) {
+		dprintk("RPC:       svcauth_gss: discarding request with "
+				"old sequence number %d\n", gc->gc_seq);
+		return SVC_DROP;
+	}
+	return SVC_OK;
+}
+
+static int
+gss_write_null_verf(struct svc_rqst *rqstp)
+{
+	__be32     *p;
+
+	svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
+	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
+	/* don't really need to check if head->iov_len > PAGE_SIZE ... */
+	*p++ = 0;
+	if (!xdr_ressize_check(rqstp, p))
+		return -1;
+	return 0;
+}
+
+static int
+gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
+{
+	__be32			xdr_seq;
+	u32			maj_stat;
+	struct xdr_buf		verf_data;
+	struct xdr_netobj	mic;
+	__be32			*p;
+	struct kvec		iov;
+
+	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
+	xdr_seq = htonl(seq);
+
+	iov.iov_base = &xdr_seq;
+	iov.iov_len = sizeof(xdr_seq);
+	xdr_buf_from_iov(&iov, &verf_data);
+	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
+	mic.data = (u8 *)(p + 1);
+	maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
+	if (maj_stat != GSS_S_COMPLETE)
+		return -1;
+	*p++ = htonl(mic.len);
+	memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
+	p += XDR_QUADLEN(mic.len);
+	if (!xdr_ressize_check(rqstp, p))
+		return -1;
+	return 0;
+}
+
+struct gss_domain {
+	struct auth_domain	h;
+	u32			pseudoflavor;
+};
+
+static struct auth_domain *
+find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
+{
+	char *name;
+
+	name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
+	if (!name)
+		return NULL;
+	return auth_domain_find(name);
+}
+
+static struct auth_ops svcauthops_gss;
+
+u32 svcauth_gss_flavor(struct auth_domain *dom)
+{
+	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
+
+	return gd->pseudoflavor;
+}
+
+EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
+
+int
+svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
+{
+	struct gss_domain	*new;
+	struct auth_domain	*test;
+	int			stat = -ENOMEM;
+
+	new = kmalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		goto out;
+	kref_init(&new->h.ref);
+	new->h.name = kstrdup(name, GFP_KERNEL);
+	if (!new->h.name)
+		goto out_free_dom;
+	new->h.flavour = &svcauthops_gss;
+	new->pseudoflavor = pseudoflavor;
+
+	stat = 0;
+	test = auth_domain_lookup(name, &new->h);
+	if (test != &new->h) { /* Duplicate registration */
+		auth_domain_put(test);
+		kfree(new->h.name);
+		goto out_free_dom;
+	}
+	return 0;
+
+out_free_dom:
+	kfree(new);
+out:
+	return stat;
+}
+
+EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
+
+static inline int
+read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
+{
+	__be32  raw;
+	int     status;
+
+	status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
+	if (status)
+		return status;
+	*obj = ntohl(raw);
+	return 0;
+}
+
+/* It would be nice if this bit of code could be shared with the client.
+ * Obstacles:
+ *	The client shouldn't malloc(), would have to pass in own memory.
+ *	The server uses base of head iovec as read pointer, while the
+ *	client uses separate pointer. */
+static int
+unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
+{
+	int stat = -EINVAL;
+	u32 integ_len, maj_stat;
+	struct xdr_netobj mic;
+	struct xdr_buf integ_buf;
+
+	/* Did we already verify the signature on the original pass through? */
+	if (rqstp->rq_deferred)
+		return 0;
+
+	integ_len = svc_getnl(&buf->head[0]);
+	if (integ_len & 3)
+		return stat;
+	if (integ_len > buf->len)
+		return stat;
+	if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
+		BUG();
+	/* copy out mic... */
+	if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
+		BUG();
+	if (mic.len > RPC_MAX_AUTH_SIZE)
+		return stat;
+	mic.data = kmalloc(mic.len, GFP_KERNEL);
+	if (!mic.data)
+		return stat;
+	if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
+		goto out;
+	maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
+	if (maj_stat != GSS_S_COMPLETE)
+		goto out;
+	if (svc_getnl(&buf->head[0]) != seq)
+		goto out;
+	/* trim off the mic at the end before returning */
+	xdr_buf_trim(buf, mic.len + 4);
+	stat = 0;
+out:
+	kfree(mic.data);
+	return stat;
+}
+
+static inline int
+total_buf_len(struct xdr_buf *buf)
+{
+	return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
+}
+
+static void
+fix_priv_head(struct xdr_buf *buf, int pad)
+{
+	if (buf->page_len == 0) {
+		/* We need to adjust head and buf->len in tandem in this
+		 * case to make svc_defer() work--it finds the original
+		 * buffer start using buf->len - buf->head[0].iov_len. */
+		buf->head[0].iov_len -= pad;
+	}
+}
+
+static int
+unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
+{
+	u32 priv_len, maj_stat;
+	int pad, saved_len, remaining_len, offset;
+
+	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
+
+	priv_len = svc_getnl(&buf->head[0]);
+	if (rqstp->rq_deferred) {
+		/* Already decrypted last time through! The sequence number
+		 * check at out_seq is unnecessary but harmless: */
+		goto out_seq;
+	}
+	/* buf->len is the number of bytes from the original start of the
+	 * request to the end, where head[0].iov_len is just the bytes
+	 * not yet read from the head, so these two values are different: */
+	remaining_len = total_buf_len(buf);
+	if (priv_len > remaining_len)
+		return -EINVAL;
+	pad = remaining_len - priv_len;
+	buf->len -= pad;
+	fix_priv_head(buf, pad);
+
+	/* Maybe it would be better to give gss_unwrap a length parameter: */
+	saved_len = buf->len;
+	buf->len = priv_len;
+	maj_stat = gss_unwrap(ctx, 0, buf);
+	pad = priv_len - buf->len;
+	buf->len = saved_len;
+	buf->len -= pad;
+	/* The upper layers assume the buffer is aligned on 4-byte boundaries.
+	 * In the krb5p case, at least, the data ends up offset, so we need to
+	 * move it around. */
+	/* XXX: This is very inefficient.  It would be better to either do
+	 * this while we encrypt, or maybe in the receive code, if we can peak
+	 * ahead and work out the service and mechanism there. */
+	offset = buf->head[0].iov_len % 4;
+	if (offset) {
+		buf->buflen = RPCSVC_MAXPAYLOAD;
+		xdr_shift_buf(buf, offset);
+		fix_priv_head(buf, pad);
+	}
+	if (maj_stat != GSS_S_COMPLETE)
+		return -EINVAL;
+out_seq:
+	if (svc_getnl(&buf->head[0]) != seq)
+		return -EINVAL;
+	return 0;
+}
+
+struct gss_svc_data {
+	/* decoded gss client cred: */
+	struct rpc_gss_wire_cred	clcred;
+	/* save a pointer to the beginning of the encoded verifier,
+	 * for use in encryption/checksumming in svcauth_gss_release: */
+	__be32				*verf_start;
+	struct rsc			*rsci;
+};
+
+static int
+svcauth_gss_set_client(struct svc_rqst *rqstp)
+{
+	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
+	struct rsc *rsci = svcdata->rsci;
+	struct rpc_gss_wire_cred *gc = &svcdata->clcred;
+	int stat;
+
+	/*
+	 * A gss export can be specified either by:
+	 * 	export	*(sec=krb5,rw)
+	 * or by
+	 * 	export gss/krb5(rw)
+	 * The latter is deprecated; but for backwards compatibility reasons
+	 * the nfsd code will still fall back on trying it if the former
+	 * doesn't work; so we try to make both available to nfsd, below.
+	 */
+	rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
+	if (rqstp->rq_gssclient == NULL)
+		return SVC_DENIED;
+	stat = svcauth_unix_set_client(rqstp);
+	if (stat == SVC_DROP || stat == SVC_CLOSE)
+		return stat;
+	return SVC_OK;
+}
+
+static inline int
+gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
+		struct xdr_netobj *out_handle, int *major_status)
+{
+	struct rsc *rsci;
+	int        rc;
+
+	if (*major_status != GSS_S_COMPLETE)
+		return gss_write_null_verf(rqstp);
+	rsci = gss_svc_searchbyctx(cd, out_handle);
+	if (rsci == NULL) {
+		*major_status = GSS_S_NO_CONTEXT;
+		return gss_write_null_verf(rqstp);
+	}
+	rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
+	cache_put(&rsci->h, cd);
+	return rc;
+}
+
+static inline int
+gss_read_common_verf(struct rpc_gss_wire_cred *gc,
+		     struct kvec *argv, __be32 *authp,
+		     struct xdr_netobj *in_handle)
+{
+	/* Read the verifier; should be NULL: */
+	*authp = rpc_autherr_badverf;
+	if (argv->iov_len < 2 * 4)
+		return SVC_DENIED;
+	if (svc_getnl(argv) != RPC_AUTH_NULL)
+		return SVC_DENIED;
+	if (svc_getnl(argv) != 0)
+		return SVC_DENIED;
+	/* Martial context handle and token for upcall: */
+	*authp = rpc_autherr_badcred;
+	if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
+		return SVC_DENIED;
+	if (dup_netobj(in_handle, &gc->gc_ctx))
+		return SVC_CLOSE;
+	*authp = rpc_autherr_badverf;
+
+	return 0;
+}
+
+static inline int
+gss_read_verf(struct rpc_gss_wire_cred *gc,
+	      struct kvec *argv, __be32 *authp,
+	      struct xdr_netobj *in_handle,
+	      struct xdr_netobj *in_token)
+{
+	struct xdr_netobj tmpobj;
+	int res;
+
+	res = gss_read_common_verf(gc, argv, authp, in_handle);
+	if (res)
+		return res;
+
+	if (svc_safe_getnetobj(argv, &tmpobj)) {
+		kfree(in_handle->data);
+		return SVC_DENIED;
+	}
+	if (dup_netobj(in_token, &tmpobj)) {
+		kfree(in_handle->data);
+		return SVC_CLOSE;
+	}
+
+	return 0;
+}
+
+/* Ok this is really heavily depending on a set of semantics in
+ * how rqstp is set up by svc_recv and pages laid down by the
+ * server when reading a request. We are basically guaranteed that
+ * the token lays all down linearly across a set of pages, starting
+ * at iov_base in rq_arg.head[0] which happens to be the first of a
+ * set of pages stored in rq_pages[].
+ * rq_arg.head[0].iov_base will provide us the page_base to pass
+ * to the upcall.
+ */
+static inline int
+gss_read_proxy_verf(struct svc_rqst *rqstp,
+		    struct rpc_gss_wire_cred *gc, __be32 *authp,
+		    struct xdr_netobj *in_handle,
+		    struct gssp_in_token *in_token)
+{
+	struct kvec *argv = &rqstp->rq_arg.head[0];
+	u32 inlen;
+	int res;
+
+	res = gss_read_common_verf(gc, argv, authp, in_handle);
+	if (res)
+		return res;
+
+	inlen = svc_getnl(argv);
+	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
+		return SVC_DENIED;
+
+	in_token->pages = rqstp->rq_pages;
+	in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK;
+	in_token->page_len = inlen;
+
+	return 0;
+}
+
+static inline int
+gss_write_resv(struct kvec *resv, size_t size_limit,
+	       struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
+	       int major_status, int minor_status)
+{
+	if (resv->iov_len + 4 > size_limit)
+		return -1;
+	svc_putnl(resv, RPC_SUCCESS);
+	if (svc_safe_putnetobj(resv, out_handle))
+		return -1;
+	if (resv->iov_len + 3 * 4 > size_limit)
+		return -1;
+	svc_putnl(resv, major_status);
+	svc_putnl(resv, minor_status);
+	svc_putnl(resv, GSS_SEQ_WIN);
+	if (svc_safe_putnetobj(resv, out_token))
+		return -1;
+	return 0;
+}
+
+/*
+ * Having read the cred already and found we're in the context
+ * initiation case, read the verifier and initiate (or check the results
+ * of) upcalls to userspace for help with context initiation.  If
+ * the upcall results are available, write the verifier and result.
+ * Otherwise, drop the request pending an answer to the upcall.
+ */
+static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
+			struct rpc_gss_wire_cred *gc, __be32 *authp)
+{
+	struct kvec *argv = &rqstp->rq_arg.head[0];
+	struct kvec *resv = &rqstp->rq_res.head[0];
+	struct rsi *rsip, rsikey;
+	int ret;
+	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
+
+	memset(&rsikey, 0, sizeof(rsikey));
+	ret = gss_read_verf(gc, argv, authp,
+			    &rsikey.in_handle, &rsikey.in_token);
+	if (ret)
+		return ret;
+
+	/* Perform upcall, or find upcall result: */
+	rsip = rsi_lookup(sn->rsi_cache, &rsikey);
+	rsi_free(&rsikey);
+	if (!rsip)
+		return SVC_CLOSE;
+	if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
+		/* No upcall result: */
+		return SVC_CLOSE;
+
+	ret = SVC_CLOSE;
+	/* Got an answer to the upcall; use it: */
+	if (gss_write_init_verf(sn->rsc_cache, rqstp,
+				&rsip->out_handle, &rsip->major_status))
+		goto out;
+	if (gss_write_resv(resv, PAGE_SIZE,
+			   &rsip->out_handle, &rsip->out_token,
+			   rsip->major_status, rsip->minor_status))
+		goto out;
+
+	ret = SVC_COMPLETE;
+out:
+	cache_put(&rsip->h, sn->rsi_cache);
+	return ret;
+}
+
+static int gss_proxy_save_rsc(struct cache_detail *cd,
+				struct gssp_upcall_data *ud,
+				uint64_t *handle)
+{
+	struct rsc rsci, *rscp = NULL;
+	static atomic64_t ctxhctr;
+	long long ctxh;
+	struct gss_api_mech *gm = NULL;
+	time_t expiry;
+	int status = -EINVAL;
+
+	memset(&rsci, 0, sizeof(rsci));
+	/* context handle */
+	status = -ENOMEM;
+	/* the handle needs to be just a unique id,
+	 * use a static counter */
+	ctxh = atomic64_inc_return(&ctxhctr);
+
+	/* make a copy for the caller */
+	*handle = ctxh;
+
+	/* make a copy for the rsc cache */
+	if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
+		goto out;
+	rscp = rsc_lookup(cd, &rsci);
+	if (!rscp)
+		goto out;
+
+	/* creds */
+	if (!ud->found_creds) {
+		/* userspace seem buggy, we should always get at least a
+		 * mapping to nobody */
+		dprintk("RPC:       No creds found!\n");
+		goto out;
+	} else {
+
+		/* steal creds */
+		rsci.cred = ud->creds;
+		memset(&ud->creds, 0, sizeof(struct svc_cred));
+
+		status = -EOPNOTSUPP;
+		/* get mech handle from OID */
+		gm = gss_mech_get_by_OID(&ud->mech_oid);
+		if (!gm)
+			goto out;
+		rsci.cred.cr_gss_mech = gm;
+
+		status = -EINVAL;
+		/* mech-specific data: */
+		status = gss_import_sec_context(ud->out_handle.data,
+						ud->out_handle.len,
+						gm, &rsci.mechctx,
+						&expiry, GFP_KERNEL);
+		if (status)
+			goto out;
+	}
+
+	rsci.h.expiry_time = expiry;
+	rscp = rsc_update(cd, &rsci, rscp);
+	status = 0;
+out:
+	rsc_free(&rsci);
+	if (rscp)
+		cache_put(&rscp->h, cd);
+	else
+		status = -ENOMEM;
+	return status;
+}
+
+static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
+			struct rpc_gss_wire_cred *gc, __be32 *authp)
+{
+	struct kvec *resv = &rqstp->rq_res.head[0];
+	struct xdr_netobj cli_handle;
+	struct gssp_upcall_data ud;
+	uint64_t handle;
+	int status;
+	int ret;
+	struct net *net = rqstp->rq_xprt->xpt_net;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	memset(&ud, 0, sizeof(ud));
+	ret = gss_read_proxy_verf(rqstp, gc, authp,
+				  &ud.in_handle, &ud.in_token);
+	if (ret)
+		return ret;
+
+	ret = SVC_CLOSE;
+
+	/* Perform synchronous upcall to gss-proxy */
+	status = gssp_accept_sec_context_upcall(net, &ud);
+	if (status)
+		goto out;
+
+	dprintk("RPC:       svcauth_gss: gss major status = %d\n",
+			ud.major_status);
+
+	switch (ud.major_status) {
+	case GSS_S_CONTINUE_NEEDED:
+		cli_handle = ud.out_handle;
+		break;
+	case GSS_S_COMPLETE:
+		status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
+		if (status)
+			goto out;
+		cli_handle.data = (u8 *)&handle;
+		cli_handle.len = sizeof(handle);
+		break;
+	default:
+		ret = SVC_CLOSE;
+		goto out;
+	}
+
+	/* Got an answer to the upcall; use it: */
+	if (gss_write_init_verf(sn->rsc_cache, rqstp,
+				&cli_handle, &ud.major_status))
+		goto out;
+	if (gss_write_resv(resv, PAGE_SIZE,
+			   &cli_handle, &ud.out_token,
+			   ud.major_status, ud.minor_status))
+		goto out;
+
+	ret = SVC_COMPLETE;
+out:
+	gssp_free_upcall_data(&ud);
+	return ret;
+}
+
+/*
+ * Try to set the sn->use_gss_proxy variable to a new value. We only allow
+ * it to be changed if it's currently undefined (-1). If it's any other value
+ * then return -EBUSY unless the type wouldn't have changed anyway.
+ */
+static int set_gss_proxy(struct net *net, int type)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	int ret;
+
+	WARN_ON_ONCE(type != 0 && type != 1);
+	ret = cmpxchg(&sn->use_gss_proxy, -1, type);
+	if (ret != -1 && ret != type)
+		return -EBUSY;
+	return 0;
+}
+
+static bool use_gss_proxy(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	/* If use_gss_proxy is still undefined, then try to disable it */
+	if (sn->use_gss_proxy == -1)
+		set_gss_proxy(net, 0);
+	return sn->use_gss_proxy;
+}
+
+#ifdef CONFIG_PROC_FS
+
+static ssize_t write_gssp(struct file *file, const char __user *buf,
+			 size_t count, loff_t *ppos)
+{
+	struct net *net = PDE_DATA(file_inode(file));
+	char tbuf[20];
+	unsigned long i;
+	int res;
+
+	if (*ppos || count > sizeof(tbuf)-1)
+		return -EINVAL;
+	if (copy_from_user(tbuf, buf, count))
+		return -EFAULT;
+
+	tbuf[count] = 0;
+	res = kstrtoul(tbuf, 0, &i);
+	if (res)
+		return res;
+	if (i != 1)
+		return -EINVAL;
+	res = set_gssp_clnt(net);
+	if (res)
+		return res;
+	res = set_gss_proxy(net, 1);
+	if (res)
+		return res;
+	return count;
+}
+
+static ssize_t read_gssp(struct file *file, char __user *buf,
+			 size_t count, loff_t *ppos)
+{
+	struct net *net = PDE_DATA(file_inode(file));
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	unsigned long p = *ppos;
+	char tbuf[10];
+	size_t len;
+
+	snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
+	len = strlen(tbuf);
+	if (p >= len)
+		return 0;
+	len -= p;
+	if (len > count)
+		len = count;
+	if (copy_to_user(buf, (void *)(tbuf+p), len))
+		return -EFAULT;
+	*ppos += len;
+	return len;
+}
+
+static const struct file_operations use_gss_proxy_ops = {
+	.open = nonseekable_open,
+	.write = write_gssp,
+	.read = read_gssp,
+};
+
+static int create_use_gss_proxy_proc_entry(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct proc_dir_entry **p = &sn->use_gssp_proc;
+
+	sn->use_gss_proxy = -1;
+	*p = proc_create_data("use-gss-proxy", S_IFREG|S_IRUSR|S_IWUSR,
+			      sn->proc_net_rpc,
+			      &use_gss_proxy_ops, net);
+	if (!*p)
+		return -ENOMEM;
+	init_gssp_clnt(sn);
+	return 0;
+}
+
+static void destroy_use_gss_proxy_proc_entry(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	if (sn->use_gssp_proc) {
+		remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); 
+		clear_gssp_clnt(sn);
+	}
+}
+#else /* CONFIG_PROC_FS */
+
+static int create_use_gss_proxy_proc_entry(struct net *net)
+{
+	return 0;
+}
+
+static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
+
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * Accept an rpcsec packet.
+ * If context establishment, punt to user space
+ * If data exchange, verify/decrypt
+ * If context destruction, handle here
+ * In the context establishment and destruction case we encode
+ * response here and return SVC_COMPLETE.
+ */
+static int
+svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
+{
+	struct kvec	*argv = &rqstp->rq_arg.head[0];
+	struct kvec	*resv = &rqstp->rq_res.head[0];
+	u32		crlen;
+	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
+	struct rpc_gss_wire_cred *gc;
+	struct rsc	*rsci = NULL;
+	__be32		*rpcstart;
+	__be32		*reject_stat = resv->iov_base + resv->iov_len;
+	int		ret;
+	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
+
+	dprintk("RPC:       svcauth_gss: argv->iov_len = %zd\n",
+			argv->iov_len);
+
+	*authp = rpc_autherr_badcred;
+	if (!svcdata)
+		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
+	if (!svcdata)
+		goto auth_err;
+	rqstp->rq_auth_data = svcdata;
+	svcdata->verf_start = NULL;
+	svcdata->rsci = NULL;
+	gc = &svcdata->clcred;
+
+	/* start of rpc packet is 7 u32's back from here:
+	 * xid direction rpcversion prog vers proc flavour
+	 */
+	rpcstart = argv->iov_base;
+	rpcstart -= 7;
+
+	/* credential is:
+	 *   version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
+	 * at least 5 u32s, and is preceded by length, so that makes 6.
+	 */
+
+	if (argv->iov_len < 5 * 4)
+		goto auth_err;
+	crlen = svc_getnl(argv);
+	if (svc_getnl(argv) != RPC_GSS_VERSION)
+		goto auth_err;
+	gc->gc_proc = svc_getnl(argv);
+	gc->gc_seq = svc_getnl(argv);
+	gc->gc_svc = svc_getnl(argv);
+	if (svc_safe_getnetobj(argv, &gc->gc_ctx))
+		goto auth_err;
+	if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
+		goto auth_err;
+
+	if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
+		goto auth_err;
+
+	*authp = rpc_autherr_badverf;
+	switch (gc->gc_proc) {
+	case RPC_GSS_PROC_INIT:
+	case RPC_GSS_PROC_CONTINUE_INIT:
+		if (use_gss_proxy(SVC_NET(rqstp)))
+			return svcauth_gss_proxy_init(rqstp, gc, authp);
+		else
+			return svcauth_gss_legacy_init(rqstp, gc, authp);
+	case RPC_GSS_PROC_DATA:
+	case RPC_GSS_PROC_DESTROY:
+		/* Look up the context, and check the verifier: */
+		*authp = rpcsec_gsserr_credproblem;
+		rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
+		if (!rsci)
+			goto auth_err;
+		switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
+		case SVC_OK:
+			break;
+		case SVC_DENIED:
+			goto auth_err;
+		case SVC_DROP:
+			goto drop;
+		}
+		break;
+	default:
+		*authp = rpc_autherr_rejectedcred;
+		goto auth_err;
+	}
+
+	/* now act upon the command: */
+	switch (gc->gc_proc) {
+	case RPC_GSS_PROC_DESTROY:
+		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
+			goto auth_err;
+		rsci->h.expiry_time = get_seconds();
+		set_bit(CACHE_NEGATIVE, &rsci->h.flags);
+		if (resv->iov_len + 4 > PAGE_SIZE)
+			goto drop;
+		svc_putnl(resv, RPC_SUCCESS);
+		goto complete;
+	case RPC_GSS_PROC_DATA:
+		*authp = rpcsec_gsserr_ctxproblem;
+		svcdata->verf_start = resv->iov_base + resv->iov_len;
+		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
+			goto auth_err;
+		rqstp->rq_cred = rsci->cred;
+		get_group_info(rsci->cred.cr_group_info);
+		*authp = rpc_autherr_badcred;
+		switch (gc->gc_svc) {
+		case RPC_GSS_SVC_NONE:
+			break;
+		case RPC_GSS_SVC_INTEGRITY:
+			/* placeholders for length and seq. number: */
+			svc_putnl(resv, 0);
+			svc_putnl(resv, 0);
+			if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
+					gc->gc_seq, rsci->mechctx))
+				goto garbage_args;
+			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
+			break;
+		case RPC_GSS_SVC_PRIVACY:
+			/* placeholders for length and seq. number: */
+			svc_putnl(resv, 0);
+			svc_putnl(resv, 0);
+			if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
+					gc->gc_seq, rsci->mechctx))
+				goto garbage_args;
+			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
+			break;
+		default:
+			goto auth_err;
+		}
+		svcdata->rsci = rsci;
+		cache_get(&rsci->h);
+		rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
+					rsci->mechctx->mech_type,
+					GSS_C_QOP_DEFAULT,
+					gc->gc_svc);
+		ret = SVC_OK;
+		goto out;
+	}
+garbage_args:
+	ret = SVC_GARBAGE;
+	goto out;
+auth_err:
+	/* Restore write pointer to its original value: */
+	xdr_ressize_check(rqstp, reject_stat);
+	ret = SVC_DENIED;
+	goto out;
+complete:
+	ret = SVC_COMPLETE;
+	goto out;
+drop:
+	ret = SVC_DROP;
+out:
+	if (rsci)
+		cache_put(&rsci->h, sn->rsc_cache);
+	return ret;
+}
+
+static __be32 *
+svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
+{
+	__be32 *p;
+	u32 verf_len;
+
+	p = gsd->verf_start;
+	gsd->verf_start = NULL;
+
+	/* If the reply stat is nonzero, don't wrap: */
+	if (*(p-1) != rpc_success)
+		return NULL;
+	/* Skip the verifier: */
+	p += 1;
+	verf_len = ntohl(*p++);
+	p += XDR_QUADLEN(verf_len);
+	/* move accept_stat to right place: */
+	memcpy(p, p + 2, 4);
+	/* Also don't wrap if the accept stat is nonzero: */
+	if (*p != rpc_success) {
+		resbuf->head[0].iov_len -= 2 * 4;
+		return NULL;
+	}
+	p++;
+	return p;
+}
+
+static inline int
+svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
+{
+	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
+	struct rpc_gss_wire_cred *gc = &gsd->clcred;
+	struct xdr_buf *resbuf = &rqstp->rq_res;
+	struct xdr_buf integ_buf;
+	struct xdr_netobj mic;
+	struct kvec *resv;
+	__be32 *p;
+	int integ_offset, integ_len;
+	int stat = -EINVAL;
+
+	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
+	if (p == NULL)
+		goto out;
+	integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
+	integ_len = resbuf->len - integ_offset;
+	BUG_ON(integ_len % 4);
+	*p++ = htonl(integ_len);
+	*p++ = htonl(gc->gc_seq);
+	if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
+		BUG();
+	if (resbuf->tail[0].iov_base == NULL) {
+		if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+			goto out_err;
+		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+						+ resbuf->head[0].iov_len;
+		resbuf->tail[0].iov_len = 0;
+	}
+	resv = &resbuf->tail[0];
+	mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
+	if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
+		goto out_err;
+	svc_putnl(resv, mic.len);
+	memset(mic.data + mic.len, 0,
+			round_up_to_quad(mic.len) - mic.len);
+	resv->iov_len += XDR_QUADLEN(mic.len) << 2;
+	/* not strictly required: */
+	resbuf->len += XDR_QUADLEN(mic.len) << 2;
+	BUG_ON(resv->iov_len > PAGE_SIZE);
+out:
+	stat = 0;
+out_err:
+	return stat;
+}
+
+static inline int
+svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
+{
+	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
+	struct rpc_gss_wire_cred *gc = &gsd->clcred;
+	struct xdr_buf *resbuf = &rqstp->rq_res;
+	struct page **inpages = NULL;
+	__be32 *p, *len;
+	int offset;
+	int pad;
+
+	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
+	if (p == NULL)
+		return 0;
+	len = p++;
+	offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
+	*p++ = htonl(gc->gc_seq);
+	inpages = resbuf->pages;
+	/* XXX: Would be better to write some xdr helper functions for
+	 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
+
+	/*
+	 * If there is currently tail data, make sure there is
+	 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
+	 * the page, and move the current tail data such that
+	 * there is RPC_MAX_AUTH_SIZE slack space available in
+	 * both the head and tail.
+	 */
+	if (resbuf->tail[0].iov_base) {
+		BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
+							+ PAGE_SIZE);
+		BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
+		if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
+				+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+			return -ENOMEM;
+		memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
+			resbuf->tail[0].iov_base,
+			resbuf->tail[0].iov_len);
+		resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
+	}
+	/*
+	 * If there is no current tail data, make sure there is
+	 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
+	 * allotted page, and set up tail information such that there
+	 * is RPC_MAX_AUTH_SIZE slack space available in both the
+	 * head and tail.
+	 */
+	if (resbuf->tail[0].iov_base == NULL) {
+		if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
+			return -ENOMEM;
+		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+			+ resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
+		resbuf->tail[0].iov_len = 0;
+	}
+	if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
+		return -ENOMEM;
+	*len = htonl(resbuf->len - offset);
+	pad = 3 - ((resbuf->len - offset - 1)&3);
+	p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
+	memset(p, 0, pad);
+	resbuf->tail[0].iov_len += pad;
+	resbuf->len += pad;
+	return 0;
+}
+
+static int
+svcauth_gss_release(struct svc_rqst *rqstp)
+{
+	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
+	struct rpc_gss_wire_cred *gc = &gsd->clcred;
+	struct xdr_buf *resbuf = &rqstp->rq_res;
+	int stat = -EINVAL;
+	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
+
+	if (gc->gc_proc != RPC_GSS_PROC_DATA)
+		goto out;
+	/* Release can be called twice, but we only wrap once. */
+	if (gsd->verf_start == NULL)
+		goto out;
+	/* normally not set till svc_send, but we need it here: */
+	/* XXX: what for?  Do we mess it up the moment we call svc_putu32
+	 * or whatever? */
+	resbuf->len = total_buf_len(resbuf);
+	switch (gc->gc_svc) {
+	case RPC_GSS_SVC_NONE:
+		break;
+	case RPC_GSS_SVC_INTEGRITY:
+		stat = svcauth_gss_wrap_resp_integ(rqstp);
+		if (stat)
+			goto out_err;
+		break;
+	case RPC_GSS_SVC_PRIVACY:
+		stat = svcauth_gss_wrap_resp_priv(rqstp);
+		if (stat)
+			goto out_err;
+		break;
+	/*
+	 * For any other gc_svc value, svcauth_gss_accept() already set
+	 * the auth_error appropriately; just fall through:
+	 */
+	}
+
+out:
+	stat = 0;
+out_err:
+	if (rqstp->rq_client)
+		auth_domain_put(rqstp->rq_client);
+	rqstp->rq_client = NULL;
+	if (rqstp->rq_gssclient)
+		auth_domain_put(rqstp->rq_gssclient);
+	rqstp->rq_gssclient = NULL;
+	if (rqstp->rq_cred.cr_group_info)
+		put_group_info(rqstp->rq_cred.cr_group_info);
+	rqstp->rq_cred.cr_group_info = NULL;
+	if (gsd->rsci)
+		cache_put(&gsd->rsci->h, sn->rsc_cache);
+	gsd->rsci = NULL;
+
+	return stat;
+}
+
+static void
+svcauth_gss_domain_release(struct auth_domain *dom)
+{
+	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
+
+	kfree(dom->name);
+	kfree(gd);
+}
+
+static struct auth_ops svcauthops_gss = {
+	.name		= "rpcsec_gss",
+	.owner		= THIS_MODULE,
+	.flavour	= RPC_AUTH_GSS,
+	.accept		= svcauth_gss_accept,
+	.release	= svcauth_gss_release,
+	.domain_release = svcauth_gss_domain_release,
+	.set_client	= svcauth_gss_set_client,
+};
+
+static int rsi_cache_create_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd;
+	int err;
+
+	cd = cache_create_net(&rsi_cache_template, net);
+	if (IS_ERR(cd))
+		return PTR_ERR(cd);
+	err = cache_register_net(cd, net);
+	if (err) {
+		cache_destroy_net(cd, net);
+		return err;
+	}
+	sn->rsi_cache = cd;
+	return 0;
+}
+
+static void rsi_cache_destroy_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd = sn->rsi_cache;
+
+	sn->rsi_cache = NULL;
+	cache_purge(cd);
+	cache_unregister_net(cd, net);
+	cache_destroy_net(cd, net);
+}
+
+static int rsc_cache_create_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd;
+	int err;
+
+	cd = cache_create_net(&rsc_cache_template, net);
+	if (IS_ERR(cd))
+		return PTR_ERR(cd);
+	err = cache_register_net(cd, net);
+	if (err) {
+		cache_destroy_net(cd, net);
+		return err;
+	}
+	sn->rsc_cache = cd;
+	return 0;
+}
+
+static void rsc_cache_destroy_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd = sn->rsc_cache;
+
+	sn->rsc_cache = NULL;
+	cache_purge(cd);
+	cache_unregister_net(cd, net);
+	cache_destroy_net(cd, net);
+}
+
+int
+gss_svc_init_net(struct net *net)
+{
+	int rv;
+
+	rv = rsc_cache_create_net(net);
+	if (rv)
+		return rv;
+	rv = rsi_cache_create_net(net);
+	if (rv)
+		goto out1;
+	rv = create_use_gss_proxy_proc_entry(net);
+	if (rv)
+		goto out2;
+	return 0;
+out2:
+	destroy_use_gss_proxy_proc_entry(net);
+out1:
+	rsc_cache_destroy_net(net);
+	return rv;
+}
+
+void
+gss_svc_shutdown_net(struct net *net)
+{
+	destroy_use_gss_proxy_proc_entry(net);
+	rsi_cache_destroy_net(net);
+	rsc_cache_destroy_net(net);
+}
+
+int
+gss_svc_init(void)
+{
+	return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
+}
+
+void
+gss_svc_shutdown(void)
+{
+	svc_auth_unregister(RPC_AUTH_GSS);
+}
diff --git a/kernel/net/sunrpc/auth_null.c b/kernel/net/sunrpc/auth_null.c
new file mode 100644
index 000000000..c2a2b584a
--- /dev/null
+++ b/kernel/net/sunrpc/auth_null.c
@@ -0,0 +1,144 @@
+/*
+ * linux/net/sunrpc/auth_null.c
+ *
+ * AUTH_NULL authentication. Really :-)
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sunrpc/clnt.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+static struct rpc_auth null_auth;
+static struct rpc_cred null_cred;
+
+static struct rpc_auth *
+nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	atomic_inc(&null_auth.au_count);
+	return &null_auth;
+}
+
+static void
+nul_destroy(struct rpc_auth *auth)
+{
+}
+
+/*
+ * Lookup NULL creds for current process
+ */
+static struct rpc_cred *
+nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	if (flags & RPCAUTH_LOOKUP_RCU)
+		return &null_cred;
+	return get_rpccred(&null_cred);
+}
+
+/*
+ * Destroy cred handle.
+ */
+static void
+nul_destroy_cred(struct rpc_cred *cred)
+{
+}
+
+/*
+ * Match cred handle against current process
+ */
+static int
+nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
+{
+	return 1;
+}
+
+/*
+ * Marshal credential.
+ */
+static __be32 *
+nul_marshal(struct rpc_task *task, __be32 *p)
+{
+	*p++ = htonl(RPC_AUTH_NULL);
+	*p++ = 0;
+	*p++ = htonl(RPC_AUTH_NULL);
+	*p++ = 0;
+
+	return p;
+}
+
+/*
+ * Refresh credential. This is a no-op for AUTH_NULL
+ */
+static int
+nul_refresh(struct rpc_task *task)
+{
+	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
+	return 0;
+}
+
+static __be32 *
+nul_validate(struct rpc_task *task, __be32 *p)
+{
+	rpc_authflavor_t	flavor;
+	u32			size;
+
+	flavor = ntohl(*p++);
+	if (flavor != RPC_AUTH_NULL) {
+		printk("RPC: bad verf flavor: %u\n", flavor);
+		return ERR_PTR(-EIO);
+	}
+
+	size = ntohl(*p++);
+	if (size != 0) {
+		printk("RPC: bad verf size: %u\n", size);
+		return ERR_PTR(-EIO);
+	}
+
+	return p;
+}
+
+const struct rpc_authops authnull_ops = {
+	.owner		= THIS_MODULE,
+	.au_flavor	= RPC_AUTH_NULL,
+	.au_name	= "NULL",
+	.create		= nul_create,
+	.destroy	= nul_destroy,
+	.lookup_cred	= nul_lookup_cred,
+};
+
+static
+struct rpc_auth null_auth = {
+	.au_cslack	= 4,
+	.au_rslack	= 2,
+	.au_ops		= &authnull_ops,
+	.au_flavor	= RPC_AUTH_NULL,
+	.au_count	= ATOMIC_INIT(0),
+};
+
+static
+const struct rpc_credops null_credops = {
+	.cr_name	= "AUTH_NULL",
+	.crdestroy	= nul_destroy_cred,
+	.crbind		= rpcauth_generic_bind_cred,
+	.crmatch	= nul_match,
+	.crmarshal	= nul_marshal,
+	.crrefresh	= nul_refresh,
+	.crvalidate	= nul_validate,
+};
+
+static
+struct rpc_cred null_cred = {
+	.cr_lru		= LIST_HEAD_INIT(null_cred.cr_lru),
+	.cr_auth	= &null_auth,
+	.cr_ops		= &null_credops,
+	.cr_count	= ATOMIC_INIT(1),
+	.cr_flags	= 1UL << RPCAUTH_CRED_UPTODATE,
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	.cr_magic	= RPCAUTH_CRED_MAGIC,
+#endif
+};
diff --git a/kernel/net/sunrpc/auth_unix.c b/kernel/net/sunrpc/auth_unix.c
new file mode 100644
index 000000000..4feda2d0a
--- /dev/null
+++ b/kernel/net/sunrpc/auth_unix.c
@@ -0,0 +1,247 @@
+/*
+ * linux/net/sunrpc/auth_unix.c
+ *
+ * UNIX-style authentication; no AUTH_SHORT support
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/user_namespace.h>
+
+#define NFS_NGROUPS	16
+
+struct unx_cred {
+	struct rpc_cred		uc_base;
+	kgid_t			uc_gid;
+	kgid_t			uc_gids[NFS_NGROUPS];
+};
+#define uc_uid			uc_base.cr_uid
+
+#define UNX_WRITESLACK		(21 + (UNX_MAXNODENAME >> 2))
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+static struct rpc_auth		unix_auth;
+static const struct rpc_credops	unix_credops;
+
+static struct rpc_auth *
+unx_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	dprintk("RPC:       creating UNIX authenticator for client %p\n",
+			clnt);
+	atomic_inc(&unix_auth.au_count);
+	return &unix_auth;
+}
+
+static void
+unx_destroy(struct rpc_auth *auth)
+{
+	dprintk("RPC:       destroying UNIX authenticator %p\n", auth);
+	rpcauth_clear_credcache(auth->au_credcache);
+}
+
+/*
+ * Lookup AUTH_UNIX creds for current process
+ */
+static struct rpc_cred *
+unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	return rpcauth_lookup_credcache(auth, acred, flags);
+}
+
+static struct rpc_cred *
+unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+	struct unx_cred	*cred;
+	unsigned int groups = 0;
+	unsigned int i;
+
+	dprintk("RPC:       allocating UNIX cred for uid %d gid %d\n",
+			from_kuid(&init_user_ns, acred->uid),
+			from_kgid(&init_user_ns, acred->gid));
+
+	if (!(cred = kmalloc(sizeof(*cred), GFP_NOFS)))
+		return ERR_PTR(-ENOMEM);
+
+	rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops);
+	cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
+
+	if (acred->group_info != NULL)
+		groups = acred->group_info->ngroups;
+	if (groups > NFS_NGROUPS)
+		groups = NFS_NGROUPS;
+
+	cred->uc_gid = acred->gid;
+	for (i = 0; i < groups; i++)
+		cred->uc_gids[i] = GROUP_AT(acred->group_info, i);
+	if (i < NFS_NGROUPS)
+		cred->uc_gids[i] = INVALID_GID;
+
+	return &cred->uc_base;
+}
+
+static void
+unx_free_cred(struct unx_cred *unx_cred)
+{
+	dprintk("RPC:       unx_free_cred %p\n", unx_cred);
+	kfree(unx_cred);
+}
+
+static void
+unx_free_cred_callback(struct rcu_head *head)
+{
+	struct unx_cred *unx_cred = container_of(head, struct unx_cred, uc_base.cr_rcu);
+	unx_free_cred(unx_cred);
+}
+
+static void
+unx_destroy_cred(struct rpc_cred *cred)
+{
+	call_rcu(&cred->cr_rcu, unx_free_cred_callback);
+}
+
+/*
+ * Match credentials against current process creds.
+ * The root_override argument takes care of cases where the caller may
+ * request root creds (e.g. for NFS swapping).
+ */
+static int
+unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags)
+{
+	struct unx_cred	*cred = container_of(rcred, struct unx_cred, uc_base);
+	unsigned int groups = 0;
+	unsigned int i;
+
+
+	if (!uid_eq(cred->uc_uid, acred->uid) || !gid_eq(cred->uc_gid, acred->gid))
+		return 0;
+
+	if (acred->group_info != NULL)
+		groups = acred->group_info->ngroups;
+	if (groups > NFS_NGROUPS)
+		groups = NFS_NGROUPS;
+	for (i = 0; i < groups ; i++)
+		if (!gid_eq(cred->uc_gids[i], GROUP_AT(acred->group_info, i)))
+			return 0;
+	if (groups < NFS_NGROUPS && gid_valid(cred->uc_gids[groups]))
+		return 0;
+	return 1;
+}
+
+/*
+ * Marshal credentials.
+ * Maybe we should keep a cached credential for performance reasons.
+ */
+static __be32 *
+unx_marshal(struct rpc_task *task, __be32 *p)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct unx_cred	*cred = container_of(task->tk_rqstp->rq_cred, struct unx_cred, uc_base);
+	__be32		*base, *hold;
+	int		i;
+
+	*p++ = htonl(RPC_AUTH_UNIX);
+	base = p++;
+	*p++ = htonl(jiffies/HZ);
+
+	/*
+	 * Copy the UTS nodename captured when the client was created.
+	 */
+	p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
+
+	*p++ = htonl((u32) from_kuid(&init_user_ns, cred->uc_uid));
+	*p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gid));
+	hold = p++;
+	for (i = 0; i < 16 && gid_valid(cred->uc_gids[i]); i++)
+		*p++ = htonl((u32) from_kgid(&init_user_ns, cred->uc_gids[i]));
+	*hold = htonl(p - hold - 1);		/* gid array length */
+	*base = htonl((p - base - 1) << 2);	/* cred length */
+
+	*p++ = htonl(RPC_AUTH_NULL);
+	*p++ = htonl(0);
+
+	return p;
+}
+
+/*
+ * Refresh credentials. This is a no-op for AUTH_UNIX
+ */
+static int
+unx_refresh(struct rpc_task *task)
+{
+	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
+	return 0;
+}
+
+static __be32 *
+unx_validate(struct rpc_task *task, __be32 *p)
+{
+	rpc_authflavor_t	flavor;
+	u32			size;
+
+	flavor = ntohl(*p++);
+	if (flavor != RPC_AUTH_NULL &&
+	    flavor != RPC_AUTH_UNIX &&
+	    flavor != RPC_AUTH_SHORT) {
+		printk("RPC: bad verf flavor: %u\n", flavor);
+		return ERR_PTR(-EIO);
+	}
+
+	size = ntohl(*p++);
+	if (size > RPC_MAX_AUTH_SIZE) {
+		printk("RPC: giant verf size: %u\n", size);
+		return ERR_PTR(-EIO);
+	}
+	task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2;
+	p += (size >> 2);
+
+	return p;
+}
+
+int __init rpc_init_authunix(void)
+{
+	return rpcauth_init_credcache(&unix_auth);
+}
+
+void rpc_destroy_authunix(void)
+{
+	rpcauth_destroy_credcache(&unix_auth);
+}
+
+const struct rpc_authops authunix_ops = {
+	.owner		= THIS_MODULE,
+	.au_flavor	= RPC_AUTH_UNIX,
+	.au_name	= "UNIX",
+	.create		= unx_create,
+	.destroy	= unx_destroy,
+	.lookup_cred	= unx_lookup_cred,
+	.crcreate	= unx_create_cred,
+};
+
+static
+struct rpc_auth		unix_auth = {
+	.au_cslack	= UNX_WRITESLACK,
+	.au_rslack	= 2,			/* assume AUTH_NULL verf */
+	.au_ops		= &authunix_ops,
+	.au_flavor	= RPC_AUTH_UNIX,
+	.au_count	= ATOMIC_INIT(0),
+};
+
+static
+const struct rpc_credops unix_credops = {
+	.cr_name	= "AUTH_UNIX",
+	.crdestroy	= unx_destroy_cred,
+	.crbind		= rpcauth_generic_bind_cred,
+	.crmatch	= unx_match,
+	.crmarshal	= unx_marshal,
+	.crrefresh	= unx_refresh,
+	.crvalidate	= unx_validate,
+};
diff --git a/kernel/net/sunrpc/backchannel_rqst.c b/kernel/net/sunrpc/backchannel_rqst.c
new file mode 100644
index 000000000..9dd0ea8db
--- /dev/null
+++ b/kernel/net/sunrpc/backchannel_rqst.c
@@ -0,0 +1,325 @@
+/******************************************************************************
+
+(c) 2007 Network Appliance, Inc.  All Rights Reserved.
+(c) 2009 NetApp.  All Rights Reserved.
+
+NetApp provides this source code under the GPL v2 License.
+The GPL v2 license is available at
+http://opensource.org/licenses/gpl-license.php.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+******************************************************************************/
+
+#include <linux/tcp.h>
+#include <linux/slab.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/export.h>
+#include <linux/sunrpc/bc_xprt.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+#define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+/*
+ * Helper routines that track the number of preallocation elements
+ * on the transport.
+ */
+static inline int xprt_need_to_requeue(struct rpc_xprt *xprt)
+{
+	return xprt->bc_alloc_count > 0;
+}
+
+static inline void xprt_inc_alloc_count(struct rpc_xprt *xprt, unsigned int n)
+{
+	xprt->bc_alloc_count += n;
+}
+
+static inline int xprt_dec_alloc_count(struct rpc_xprt *xprt, unsigned int n)
+{
+	return xprt->bc_alloc_count -= n;
+}
+
+/*
+ * Free the preallocated rpc_rqst structure and the memory
+ * buffers hanging off of it.
+ */
+static void xprt_free_allocation(struct rpc_rqst *req)
+{
+	struct xdr_buf *xbufp;
+
+	dprintk("RPC:        free allocations for req= %p\n", req);
+	WARN_ON_ONCE(test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state));
+	xbufp = &req->rq_private_buf;
+	free_page((unsigned long)xbufp->head[0].iov_base);
+	xbufp = &req->rq_snd_buf;
+	free_page((unsigned long)xbufp->head[0].iov_base);
+	kfree(req);
+}
+
+/*
+ * Preallocate up to min_reqs structures and related buffers for use
+ * by the backchannel.  This function can be called multiple times
+ * when creating new sessions that use the same rpc_xprt.  The
+ * preallocated buffers are added to the pool of resources used by
+ * the rpc_xprt.  Anyone of these resources may be used used by an
+ * incoming callback request.  It's up to the higher levels in the
+ * stack to enforce that the maximum number of session slots is not
+ * being exceeded.
+ *
+ * Some callback arguments can be large.  For example, a pNFS server
+ * using multiple deviceids.  The list can be unbound, but the client
+ * has the ability to tell the server the maximum size of the callback
+ * requests.  Each deviceID is 16 bytes, so allocate one page
+ * for the arguments to have enough room to receive a number of these
+ * deviceIDs.  The NFS client indicates to the pNFS server that its
+ * callback requests can be up to 4096 bytes in size.
+ */
+int xprt_setup_backchannel(struct rpc_xprt *xprt, unsigned int min_reqs)
+{
+	struct page *page_rcv = NULL, *page_snd = NULL;
+	struct xdr_buf *xbufp = NULL;
+	struct rpc_rqst *req, *tmp;
+	struct list_head tmp_list;
+	int i;
+
+	dprintk("RPC:       setup backchannel transport\n");
+
+	/*
+	 * We use a temporary list to keep track of the preallocated
+	 * buffers.  Once we're done building the list we splice it
+	 * into the backchannel preallocation list off of the rpc_xprt
+	 * struct.  This helps minimize the amount of time the list
+	 * lock is held on the rpc_xprt struct.  It also makes cleanup
+	 * easier in case of memory allocation errors.
+	 */
+	INIT_LIST_HEAD(&tmp_list);
+	for (i = 0; i < min_reqs; i++) {
+		/* Pre-allocate one backchannel rpc_rqst */
+		req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL);
+		if (req == NULL) {
+			printk(KERN_ERR "Failed to create bc rpc_rqst\n");
+			goto out_free;
+		}
+
+		/* Add the allocated buffer to the tmp list */
+		dprintk("RPC:       adding req= %p\n", req);
+		list_add(&req->rq_bc_pa_list, &tmp_list);
+
+		req->rq_xprt = xprt;
+		INIT_LIST_HEAD(&req->rq_list);
+		INIT_LIST_HEAD(&req->rq_bc_list);
+
+		/* Preallocate one XDR receive buffer */
+		page_rcv = alloc_page(GFP_KERNEL);
+		if (page_rcv == NULL) {
+			printk(KERN_ERR "Failed to create bc receive xbuf\n");
+			goto out_free;
+		}
+		xbufp = &req->rq_rcv_buf;
+		xbufp->head[0].iov_base = page_address(page_rcv);
+		xbufp->head[0].iov_len = PAGE_SIZE;
+		xbufp->tail[0].iov_base = NULL;
+		xbufp->tail[0].iov_len = 0;
+		xbufp->page_len = 0;
+		xbufp->len = PAGE_SIZE;
+		xbufp->buflen = PAGE_SIZE;
+
+		/* Preallocate one XDR send buffer */
+		page_snd = alloc_page(GFP_KERNEL);
+		if (page_snd == NULL) {
+			printk(KERN_ERR "Failed to create bc snd xbuf\n");
+			goto out_free;
+		}
+
+		xbufp = &req->rq_snd_buf;
+		xbufp->head[0].iov_base = page_address(page_snd);
+		xbufp->head[0].iov_len = 0;
+		xbufp->tail[0].iov_base = NULL;
+		xbufp->tail[0].iov_len = 0;
+		xbufp->page_len = 0;
+		xbufp->len = 0;
+		xbufp->buflen = PAGE_SIZE;
+	}
+
+	/*
+	 * Add the temporary list to the backchannel preallocation list
+	 */
+	spin_lock_bh(&xprt->bc_pa_lock);
+	list_splice(&tmp_list, &xprt->bc_pa_list);
+	xprt_inc_alloc_count(xprt, min_reqs);
+	spin_unlock_bh(&xprt->bc_pa_lock);
+
+	dprintk("RPC:       setup backchannel transport done\n");
+	return 0;
+
+out_free:
+	/*
+	 * Memory allocation failed, free the temporary list
+	 */
+	list_for_each_entry_safe(req, tmp, &tmp_list, rq_bc_pa_list) {
+		list_del(&req->rq_bc_pa_list);
+		xprt_free_allocation(req);
+	}
+
+	dprintk("RPC:       setup backchannel transport failed\n");
+	return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(xprt_setup_backchannel);
+
+/**
+ * xprt_destroy_backchannel - Destroys the backchannel preallocated structures.
+ * @xprt:	the transport holding the preallocated strucures
+ * @max_reqs	the maximum number of preallocated structures to destroy
+ *
+ * Since these structures may have been allocated by multiple calls
+ * to xprt_setup_backchannel, we only destroy up to the maximum number
+ * of reqs specified by the caller.
+ */
+void xprt_destroy_backchannel(struct rpc_xprt *xprt, unsigned int max_reqs)
+{
+	struct rpc_rqst *req = NULL, *tmp = NULL;
+
+	dprintk("RPC:        destroy backchannel transport\n");
+
+	if (max_reqs == 0)
+		goto out;
+
+	spin_lock_bh(&xprt->bc_pa_lock);
+	xprt_dec_alloc_count(xprt, max_reqs);
+	list_for_each_entry_safe(req, tmp, &xprt->bc_pa_list, rq_bc_pa_list) {
+		dprintk("RPC:        req=%p\n", req);
+		list_del(&req->rq_bc_pa_list);
+		xprt_free_allocation(req);
+		if (--max_reqs == 0)
+			break;
+	}
+	spin_unlock_bh(&xprt->bc_pa_lock);
+
+out:
+	dprintk("RPC:        backchannel list empty= %s\n",
+		list_empty(&xprt->bc_pa_list) ? "true" : "false");
+}
+EXPORT_SYMBOL_GPL(xprt_destroy_backchannel);
+
+static struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt, __be32 xid)
+{
+	struct rpc_rqst *req = NULL;
+
+	dprintk("RPC:       allocate a backchannel request\n");
+	if (list_empty(&xprt->bc_pa_list))
+		goto not_found;
+
+	req = list_first_entry(&xprt->bc_pa_list, struct rpc_rqst,
+				rq_bc_pa_list);
+	req->rq_reply_bytes_recvd = 0;
+	req->rq_bytes_sent = 0;
+	memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
+			sizeof(req->rq_private_buf));
+	req->rq_xid = xid;
+	req->rq_connect_cookie = xprt->connect_cookie;
+not_found:
+	dprintk("RPC:       backchannel req=%p\n", req);
+	return req;
+}
+
+/*
+ * Return the preallocated rpc_rqst structure and XDR buffers
+ * associated with this rpc_task.
+ */
+void xprt_free_bc_request(struct rpc_rqst *req)
+{
+	struct rpc_xprt *xprt = req->rq_xprt;
+
+	dprintk("RPC:       free backchannel req=%p\n", req);
+
+	req->rq_connect_cookie = xprt->connect_cookie - 1;
+	smp_mb__before_atomic();
+	WARN_ON_ONCE(!test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state));
+	clear_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
+	smp_mb__after_atomic();
+
+	if (!xprt_need_to_requeue(xprt)) {
+		/*
+		 * The last remaining session was destroyed while this
+		 * entry was in use.  Free the entry and don't attempt
+		 * to add back to the list because there is no need to
+		 * have anymore preallocated entries.
+		 */
+		dprintk("RPC:       Last session removed req=%p\n", req);
+		xprt_free_allocation(req);
+		return;
+	}
+
+	/*
+	 * Return it to the list of preallocations so that it
+	 * may be reused by a new callback request.
+	 */
+	spin_lock_bh(&xprt->bc_pa_lock);
+	list_add_tail(&req->rq_bc_pa_list, &xprt->bc_pa_list);
+	spin_unlock_bh(&xprt->bc_pa_lock);
+}
+
+/*
+ * One or more rpc_rqst structure have been preallocated during the
+ * backchannel setup.  Buffer space for the send and private XDR buffers
+ * has been preallocated as well.  Use xprt_alloc_bc_request to allocate
+ * to this request.  Use xprt_free_bc_request to return it.
+ *
+ * We know that we're called in soft interrupt context, grab the spin_lock
+ * since there is no need to grab the bottom half spin_lock.
+ *
+ * Return an available rpc_rqst, otherwise NULL if non are available.
+ */
+struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid)
+{
+	struct rpc_rqst *req;
+
+	spin_lock(&xprt->bc_pa_lock);
+	list_for_each_entry(req, &xprt->bc_pa_list, rq_bc_pa_list) {
+		if (req->rq_connect_cookie != xprt->connect_cookie)
+			continue;
+		if (req->rq_xid == xid)
+			goto found;
+	}
+	req = xprt_alloc_bc_request(xprt, xid);
+found:
+	spin_unlock(&xprt->bc_pa_lock);
+	return req;
+}
+
+/*
+ * Add callback request to callback list.  The callback
+ * service sleeps on the sv_cb_waitq waiting for new
+ * requests.  Wake it up after adding enqueing the
+ * request.
+ */
+void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied)
+{
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct svc_serv *bc_serv = xprt->bc_serv;
+
+	spin_lock(&xprt->bc_pa_lock);
+	list_del(&req->rq_bc_pa_list);
+	spin_unlock(&xprt->bc_pa_lock);
+
+	req->rq_private_buf.len = copied;
+	set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
+
+	dprintk("RPC:       add callback request to list\n");
+	spin_lock(&bc_serv->sv_cb_lock);
+	list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
+	wake_up(&bc_serv->sv_cb_waitq);
+	spin_unlock(&bc_serv->sv_cb_lock);
+}
+
diff --git a/kernel/net/sunrpc/bc_svc.c b/kernel/net/sunrpc/bc_svc.c
new file mode 100644
index 000000000..15c7a8a1c
--- /dev/null
+++ b/kernel/net/sunrpc/bc_svc.c
@@ -0,0 +1,63 @@
+/******************************************************************************
+
+(c) 2007 Network Appliance, Inc.  All Rights Reserved.
+(c) 2009 NetApp.  All Rights Reserved.
+
+NetApp provides this source code under the GPL v2 License.
+The GPL v2 license is available at
+http://opensource.org/licenses/gpl-license.php.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+******************************************************************************/
+
+/*
+ * The NFSv4.1 callback service helper routines.
+ * They implement the transport level processing required to send the
+ * reply over an existing open connection previously established by the client.
+ */
+
+#include <linux/module.h>
+
+#include <linux/sunrpc/xprt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/bc_xprt.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCDSP
+
+/* Empty callback ops */
+static const struct rpc_call_ops nfs41_callback_ops = {
+};
+
+
+/*
+ * Send the callback reply
+ */
+int bc_send(struct rpc_rqst *req)
+{
+	struct rpc_task *task;
+	int ret;
+
+	dprintk("RPC:       bc_send req= %p\n", req);
+	task = rpc_run_bc_task(req, &nfs41_callback_ops);
+	if (IS_ERR(task))
+		ret = PTR_ERR(task);
+	else {
+		WARN_ON_ONCE(atomic_read(&task->tk_count) != 1);
+		ret = task->tk_status;
+		rpc_put_task(task);
+	}
+	dprintk("RPC:       bc_send ret= %d\n", ret);
+	return ret;
+}
+
diff --git a/kernel/net/sunrpc/cache.c b/kernel/net/sunrpc/cache.c
new file mode 100644
index 000000000..2928afffb
--- /dev/null
+++ b/kernel/net/sunrpc/cache.c
@@ -0,0 +1,1826 @@
+/*
+ * net/sunrpc/cache.c
+ *
+ * Generic code for various authentication-related caches
+ * used by sunrpc clients and servers.
+ *
+ * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
+ *
+ * Released under terms in GPL version 2.  See COPYING.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/string_helpers.h>
+#include <asm/uaccess.h>
+#include <linux/poll.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/net.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/pagemap.h>
+#include <asm/ioctls.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/cache.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include "netns.h"
+
+#define	 RPCDBG_FACILITY RPCDBG_CACHE
+
+static bool cache_defer_req(struct cache_req *req, struct cache_head *item);
+static void cache_revisit_request(struct cache_head *item);
+
+static void cache_init(struct cache_head *h)
+{
+	time_t now = seconds_since_boot();
+	h->next = NULL;
+	h->flags = 0;
+	kref_init(&h->ref);
+	h->expiry_time = now + CACHE_NEW_EXPIRY;
+	h->last_refresh = now;
+}
+
+struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
+				       struct cache_head *key, int hash)
+{
+	struct cache_head **head,  **hp;
+	struct cache_head *new = NULL, *freeme = NULL;
+
+	head = &detail->hash_table[hash];
+
+	read_lock(&detail->hash_lock);
+
+	for (hp=head; *hp != NULL ; hp = &(*hp)->next) {
+		struct cache_head *tmp = *hp;
+		if (detail->match(tmp, key)) {
+			if (cache_is_expired(detail, tmp))
+				/* This entry is expired, we will discard it. */
+				break;
+			cache_get(tmp);
+			read_unlock(&detail->hash_lock);
+			return tmp;
+		}
+	}
+	read_unlock(&detail->hash_lock);
+	/* Didn't find anything, insert an empty entry */
+
+	new = detail->alloc();
+	if (!new)
+		return NULL;
+	/* must fully initialise 'new', else
+	 * we might get lose if we need to
+	 * cache_put it soon.
+	 */
+	cache_init(new);
+	detail->init(new, key);
+
+	write_lock(&detail->hash_lock);
+
+	/* check if entry appeared while we slept */
+	for (hp=head; *hp != NULL ; hp = &(*hp)->next) {
+		struct cache_head *tmp = *hp;
+		if (detail->match(tmp, key)) {
+			if (cache_is_expired(detail, tmp)) {
+				*hp = tmp->next;
+				tmp->next = NULL;
+				detail->entries --;
+				freeme = tmp;
+				break;
+			}
+			cache_get(tmp);
+			write_unlock(&detail->hash_lock);
+			cache_put(new, detail);
+			return tmp;
+		}
+	}
+	new->next = *head;
+	*head = new;
+	detail->entries++;
+	cache_get(new);
+	write_unlock(&detail->hash_lock);
+
+	if (freeme)
+		cache_put(freeme, detail);
+	return new;
+}
+EXPORT_SYMBOL_GPL(sunrpc_cache_lookup);
+
+
+static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch);
+
+static void cache_fresh_locked(struct cache_head *head, time_t expiry)
+{
+	head->expiry_time = expiry;
+	head->last_refresh = seconds_since_boot();
+	smp_wmb(); /* paired with smp_rmb() in cache_is_valid() */
+	set_bit(CACHE_VALID, &head->flags);
+}
+
+static void cache_fresh_unlocked(struct cache_head *head,
+				 struct cache_detail *detail)
+{
+	if (test_and_clear_bit(CACHE_PENDING, &head->flags)) {
+		cache_revisit_request(head);
+		cache_dequeue(detail, head);
+	}
+}
+
+struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
+				       struct cache_head *new, struct cache_head *old, int hash)
+{
+	/* The 'old' entry is to be replaced by 'new'.
+	 * If 'old' is not VALID, we update it directly,
+	 * otherwise we need to replace it
+	 */
+	struct cache_head **head;
+	struct cache_head *tmp;
+
+	if (!test_bit(CACHE_VALID, &old->flags)) {
+		write_lock(&detail->hash_lock);
+		if (!test_bit(CACHE_VALID, &old->flags)) {
+			if (test_bit(CACHE_NEGATIVE, &new->flags))
+				set_bit(CACHE_NEGATIVE, &old->flags);
+			else
+				detail->update(old, new);
+			cache_fresh_locked(old, new->expiry_time);
+			write_unlock(&detail->hash_lock);
+			cache_fresh_unlocked(old, detail);
+			return old;
+		}
+		write_unlock(&detail->hash_lock);
+	}
+	/* We need to insert a new entry */
+	tmp = detail->alloc();
+	if (!tmp) {
+		cache_put(old, detail);
+		return NULL;
+	}
+	cache_init(tmp);
+	detail->init(tmp, old);
+	head = &detail->hash_table[hash];
+
+	write_lock(&detail->hash_lock);
+	if (test_bit(CACHE_NEGATIVE, &new->flags))
+		set_bit(CACHE_NEGATIVE, &tmp->flags);
+	else
+		detail->update(tmp, new);
+	tmp->next = *head;
+	*head = tmp;
+	detail->entries++;
+	cache_get(tmp);
+	cache_fresh_locked(tmp, new->expiry_time);
+	cache_fresh_locked(old, 0);
+	write_unlock(&detail->hash_lock);
+	cache_fresh_unlocked(tmp, detail);
+	cache_fresh_unlocked(old, detail);
+	cache_put(old, detail);
+	return tmp;
+}
+EXPORT_SYMBOL_GPL(sunrpc_cache_update);
+
+static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h)
+{
+	if (cd->cache_upcall)
+		return cd->cache_upcall(cd, h);
+	return sunrpc_cache_pipe_upcall(cd, h);
+}
+
+static inline int cache_is_valid(struct cache_head *h)
+{
+	if (!test_bit(CACHE_VALID, &h->flags))
+		return -EAGAIN;
+	else {
+		/* entry is valid */
+		if (test_bit(CACHE_NEGATIVE, &h->flags))
+			return -ENOENT;
+		else {
+			/*
+			 * In combination with write barrier in
+			 * sunrpc_cache_update, ensures that anyone
+			 * using the cache entry after this sees the
+			 * updated contents:
+			 */
+			smp_rmb();
+			return 0;
+		}
+	}
+}
+
+static int try_to_negate_entry(struct cache_detail *detail, struct cache_head *h)
+{
+	int rv;
+
+	write_lock(&detail->hash_lock);
+	rv = cache_is_valid(h);
+	if (rv == -EAGAIN) {
+		set_bit(CACHE_NEGATIVE, &h->flags);
+		cache_fresh_locked(h, seconds_since_boot()+CACHE_NEW_EXPIRY);
+		rv = -ENOENT;
+	}
+	write_unlock(&detail->hash_lock);
+	cache_fresh_unlocked(h, detail);
+	return rv;
+}
+
+/*
+ * This is the generic cache management routine for all
+ * the authentication caches.
+ * It checks the currency of a cache item and will (later)
+ * initiate an upcall to fill it if needed.
+ *
+ *
+ * Returns 0 if the cache_head can be used, or cache_puts it and returns
+ * -EAGAIN if upcall is pending and request has been queued
+ * -ETIMEDOUT if upcall failed or request could not be queue or
+ *           upcall completed but item is still invalid (implying that
+ *           the cache item has been replaced with a newer one).
+ * -ENOENT if cache entry was negative
+ */
+int cache_check(struct cache_detail *detail,
+		    struct cache_head *h, struct cache_req *rqstp)
+{
+	int rv;
+	long refresh_age, age;
+
+	/* First decide return status as best we can */
+	rv = cache_is_valid(h);
+
+	/* now see if we want to start an upcall */
+	refresh_age = (h->expiry_time - h->last_refresh);
+	age = seconds_since_boot() - h->last_refresh;
+
+	if (rqstp == NULL) {
+		if (rv == -EAGAIN)
+			rv = -ENOENT;
+	} else if (rv == -EAGAIN ||
+		   (h->expiry_time != 0 && age > refresh_age/2)) {
+		dprintk("RPC:       Want update, refage=%ld, age=%ld\n",
+				refresh_age, age);
+		if (!test_and_set_bit(CACHE_PENDING, &h->flags)) {
+			switch (cache_make_upcall(detail, h)) {
+			case -EINVAL:
+				rv = try_to_negate_entry(detail, h);
+				break;
+			case -EAGAIN:
+				cache_fresh_unlocked(h, detail);
+				break;
+			}
+		}
+	}
+
+	if (rv == -EAGAIN) {
+		if (!cache_defer_req(rqstp, h)) {
+			/*
+			 * Request was not deferred; handle it as best
+			 * we can ourselves:
+			 */
+			rv = cache_is_valid(h);
+			if (rv == -EAGAIN)
+				rv = -ETIMEDOUT;
+		}
+	}
+	if (rv)
+		cache_put(h, detail);
+	return rv;
+}
+EXPORT_SYMBOL_GPL(cache_check);
+
+/*
+ * caches need to be periodically cleaned.
+ * For this we maintain a list of cache_detail and
+ * a current pointer into that list and into the table
+ * for that entry.
+ *
+ * Each time cache_clean is called it finds the next non-empty entry
+ * in the current table and walks the list in that entry
+ * looking for entries that can be removed.
+ *
+ * An entry gets removed if:
+ * - The expiry is before current time
+ * - The last_refresh time is before the flush_time for that cache
+ *
+ * later we might drop old entries with non-NEVER expiry if that table
+ * is getting 'full' for some definition of 'full'
+ *
+ * The question of "how often to scan a table" is an interesting one
+ * and is answered in part by the use of the "nextcheck" field in the
+ * cache_detail.
+ * When a scan of a table begins, the nextcheck field is set to a time
+ * that is well into the future.
+ * While scanning, if an expiry time is found that is earlier than the
+ * current nextcheck time, nextcheck is set to that expiry time.
+ * If the flush_time is ever set to a time earlier than the nextcheck
+ * time, the nextcheck time is then set to that flush_time.
+ *
+ * A table is then only scanned if the current time is at least
+ * the nextcheck time.
+ *
+ */
+
+static LIST_HEAD(cache_list);
+static DEFINE_SPINLOCK(cache_list_lock);
+static struct cache_detail *current_detail;
+static int current_index;
+
+static void do_cache_clean(struct work_struct *work);
+static struct delayed_work cache_cleaner;
+
+void sunrpc_init_cache_detail(struct cache_detail *cd)
+{
+	rwlock_init(&cd->hash_lock);
+	INIT_LIST_HEAD(&cd->queue);
+	spin_lock(&cache_list_lock);
+	cd->nextcheck = 0;
+	cd->entries = 0;
+	atomic_set(&cd->readers, 0);
+	cd->last_close = 0;
+	cd->last_warn = -1;
+	list_add(&cd->others, &cache_list);
+	spin_unlock(&cache_list_lock);
+
+	/* start the cleaning process */
+	schedule_delayed_work(&cache_cleaner, 0);
+}
+EXPORT_SYMBOL_GPL(sunrpc_init_cache_detail);
+
+void sunrpc_destroy_cache_detail(struct cache_detail *cd)
+{
+	cache_purge(cd);
+	spin_lock(&cache_list_lock);
+	write_lock(&cd->hash_lock);
+	if (cd->entries || atomic_read(&cd->inuse)) {
+		write_unlock(&cd->hash_lock);
+		spin_unlock(&cache_list_lock);
+		goto out;
+	}
+	if (current_detail == cd)
+		current_detail = NULL;
+	list_del_init(&cd->others);
+	write_unlock(&cd->hash_lock);
+	spin_unlock(&cache_list_lock);
+	if (list_empty(&cache_list)) {
+		/* module must be being unloaded so its safe to kill the worker */
+		cancel_delayed_work_sync(&cache_cleaner);
+	}
+	return;
+out:
+	printk(KERN_ERR "RPC: failed to unregister %s cache\n", cd->name);
+}
+EXPORT_SYMBOL_GPL(sunrpc_destroy_cache_detail);
+
+/* clean cache tries to find something to clean
+ * and cleans it.
+ * It returns 1 if it cleaned something,
+ *            0 if it didn't find anything this time
+ *           -1 if it fell off the end of the list.
+ */
+static int cache_clean(void)
+{
+	int rv = 0;
+	struct list_head *next;
+
+	spin_lock(&cache_list_lock);
+
+	/* find a suitable table if we don't already have one */
+	while (current_detail == NULL ||
+	    current_index >= current_detail->hash_size) {
+		if (current_detail)
+			next = current_detail->others.next;
+		else
+			next = cache_list.next;
+		if (next == &cache_list) {
+			current_detail = NULL;
+			spin_unlock(&cache_list_lock);
+			return -1;
+		}
+		current_detail = list_entry(next, struct cache_detail, others);
+		if (current_detail->nextcheck > seconds_since_boot())
+			current_index = current_detail->hash_size;
+		else {
+			current_index = 0;
+			current_detail->nextcheck = seconds_since_boot()+30*60;
+		}
+	}
+
+	/* find a non-empty bucket in the table */
+	while (current_detail &&
+	       current_index < current_detail->hash_size &&
+	       current_detail->hash_table[current_index] == NULL)
+		current_index++;
+
+	/* find a cleanable entry in the bucket and clean it, or set to next bucket */
+
+	if (current_detail && current_index < current_detail->hash_size) {
+		struct cache_head *ch, **cp;
+		struct cache_detail *d;
+
+		write_lock(&current_detail->hash_lock);
+
+		/* Ok, now to clean this strand */
+
+		cp = & current_detail->hash_table[current_index];
+		for (ch = *cp ; ch ; cp = & ch->next, ch = *cp) {
+			if (current_detail->nextcheck > ch->expiry_time)
+				current_detail->nextcheck = ch->expiry_time+1;
+			if (!cache_is_expired(current_detail, ch))
+				continue;
+
+			*cp = ch->next;
+			ch->next = NULL;
+			current_detail->entries--;
+			rv = 1;
+			break;
+		}
+
+		write_unlock(&current_detail->hash_lock);
+		d = current_detail;
+		if (!ch)
+			current_index ++;
+		spin_unlock(&cache_list_lock);
+		if (ch) {
+			set_bit(CACHE_CLEANED, &ch->flags);
+			cache_fresh_unlocked(ch, d);
+			cache_put(ch, d);
+		}
+	} else
+		spin_unlock(&cache_list_lock);
+
+	return rv;
+}
+
+/*
+ * We want to regularly clean the cache, so we need to schedule some work ...
+ */
+static void do_cache_clean(struct work_struct *work)
+{
+	int delay = 5;
+	if (cache_clean() == -1)
+		delay = round_jiffies_relative(30*HZ);
+
+	if (list_empty(&cache_list))
+		delay = 0;
+
+	if (delay)
+		schedule_delayed_work(&cache_cleaner, delay);
+}
+
+
+/*
+ * Clean all caches promptly.  This just calls cache_clean
+ * repeatedly until we are sure that every cache has had a chance to
+ * be fully cleaned
+ */
+void cache_flush(void)
+{
+	while (cache_clean() != -1)
+		cond_resched();
+	while (cache_clean() != -1)
+		cond_resched();
+}
+EXPORT_SYMBOL_GPL(cache_flush);
+
+void cache_purge(struct cache_detail *detail)
+{
+	detail->flush_time = LONG_MAX;
+	detail->nextcheck = seconds_since_boot();
+	cache_flush();
+	detail->flush_time = 1;
+}
+EXPORT_SYMBOL_GPL(cache_purge);
+
+
+/*
+ * Deferral and Revisiting of Requests.
+ *
+ * If a cache lookup finds a pending entry, we
+ * need to defer the request and revisit it later.
+ * All deferred requests are stored in a hash table,
+ * indexed by "struct cache_head *".
+ * As it may be wasteful to store a whole request
+ * structure, we allow the request to provide a
+ * deferred form, which must contain a
+ * 'struct cache_deferred_req'
+ * This cache_deferred_req contains a method to allow
+ * it to be revisited when cache info is available
+ */
+
+#define	DFR_HASHSIZE	(PAGE_SIZE/sizeof(struct list_head))
+#define	DFR_HASH(item)	((((long)item)>>4 ^ (((long)item)>>13)) % DFR_HASHSIZE)
+
+#define	DFR_MAX	300	/* ??? */
+
+static DEFINE_SPINLOCK(cache_defer_lock);
+static LIST_HEAD(cache_defer_list);
+static struct hlist_head cache_defer_hash[DFR_HASHSIZE];
+static int cache_defer_cnt;
+
+static void __unhash_deferred_req(struct cache_deferred_req *dreq)
+{
+	hlist_del_init(&dreq->hash);
+	if (!list_empty(&dreq->recent)) {
+		list_del_init(&dreq->recent);
+		cache_defer_cnt--;
+	}
+}
+
+static void __hash_deferred_req(struct cache_deferred_req *dreq, struct cache_head *item)
+{
+	int hash = DFR_HASH(item);
+
+	INIT_LIST_HEAD(&dreq->recent);
+	hlist_add_head(&dreq->hash, &cache_defer_hash[hash]);
+}
+
+static void setup_deferral(struct cache_deferred_req *dreq,
+			   struct cache_head *item,
+			   int count_me)
+{
+
+	dreq->item = item;
+
+	spin_lock(&cache_defer_lock);
+
+	__hash_deferred_req(dreq, item);
+
+	if (count_me) {
+		cache_defer_cnt++;
+		list_add(&dreq->recent, &cache_defer_list);
+	}
+
+	spin_unlock(&cache_defer_lock);
+
+}
+
+struct thread_deferred_req {
+	struct cache_deferred_req handle;
+	struct completion completion;
+};
+
+static void cache_restart_thread(struct cache_deferred_req *dreq, int too_many)
+{
+	struct thread_deferred_req *dr =
+		container_of(dreq, struct thread_deferred_req, handle);
+	complete(&dr->completion);
+}
+
+static void cache_wait_req(struct cache_req *req, struct cache_head *item)
+{
+	struct thread_deferred_req sleeper;
+	struct cache_deferred_req *dreq = &sleeper.handle;
+
+	sleeper.completion = COMPLETION_INITIALIZER_ONSTACK(sleeper.completion);
+	dreq->revisit = cache_restart_thread;
+
+	setup_deferral(dreq, item, 0);
+
+	if (!test_bit(CACHE_PENDING, &item->flags) ||
+	    wait_for_completion_interruptible_timeout(
+		    &sleeper.completion, req->thread_wait) <= 0) {
+		/* The completion wasn't completed, so we need
+		 * to clean up
+		 */
+		spin_lock(&cache_defer_lock);
+		if (!hlist_unhashed(&sleeper.handle.hash)) {
+			__unhash_deferred_req(&sleeper.handle);
+			spin_unlock(&cache_defer_lock);
+		} else {
+			/* cache_revisit_request already removed
+			 * this from the hash table, but hasn't
+			 * called ->revisit yet.  It will very soon
+			 * and we need to wait for it.
+			 */
+			spin_unlock(&cache_defer_lock);
+			wait_for_completion(&sleeper.completion);
+		}
+	}
+}
+
+static void cache_limit_defers(void)
+{
+	/* Make sure we haven't exceed the limit of allowed deferred
+	 * requests.
+	 */
+	struct cache_deferred_req *discard = NULL;
+
+	if (cache_defer_cnt <= DFR_MAX)
+		return;
+
+	spin_lock(&cache_defer_lock);
+
+	/* Consider removing either the first or the last */
+	if (cache_defer_cnt > DFR_MAX) {
+		if (prandom_u32() & 1)
+			discard = list_entry(cache_defer_list.next,
+					     struct cache_deferred_req, recent);
+		else
+			discard = list_entry(cache_defer_list.prev,
+					     struct cache_deferred_req, recent);
+		__unhash_deferred_req(discard);
+	}
+	spin_unlock(&cache_defer_lock);
+	if (discard)
+		discard->revisit(discard, 1);
+}
+
+/* Return true if and only if a deferred request is queued. */
+static bool cache_defer_req(struct cache_req *req, struct cache_head *item)
+{
+	struct cache_deferred_req *dreq;
+
+	if (req->thread_wait) {
+		cache_wait_req(req, item);
+		if (!test_bit(CACHE_PENDING, &item->flags))
+			return false;
+	}
+	dreq = req->defer(req);
+	if (dreq == NULL)
+		return false;
+	setup_deferral(dreq, item, 1);
+	if (!test_bit(CACHE_PENDING, &item->flags))
+		/* Bit could have been cleared before we managed to
+		 * set up the deferral, so need to revisit just in case
+		 */
+		cache_revisit_request(item);
+
+	cache_limit_defers();
+	return true;
+}
+
+static void cache_revisit_request(struct cache_head *item)
+{
+	struct cache_deferred_req *dreq;
+	struct list_head pending;
+	struct hlist_node *tmp;
+	int hash = DFR_HASH(item);
+
+	INIT_LIST_HEAD(&pending);
+	spin_lock(&cache_defer_lock);
+
+	hlist_for_each_entry_safe(dreq, tmp, &cache_defer_hash[hash], hash)
+		if (dreq->item == item) {
+			__unhash_deferred_req(dreq);
+			list_add(&dreq->recent, &pending);
+		}
+
+	spin_unlock(&cache_defer_lock);
+
+	while (!list_empty(&pending)) {
+		dreq = list_entry(pending.next, struct cache_deferred_req, recent);
+		list_del_init(&dreq->recent);
+		dreq->revisit(dreq, 0);
+	}
+}
+
+void cache_clean_deferred(void *owner)
+{
+	struct cache_deferred_req *dreq, *tmp;
+	struct list_head pending;
+
+
+	INIT_LIST_HEAD(&pending);
+	spin_lock(&cache_defer_lock);
+
+	list_for_each_entry_safe(dreq, tmp, &cache_defer_list, recent) {
+		if (dreq->owner == owner) {
+			__unhash_deferred_req(dreq);
+			list_add(&dreq->recent, &pending);
+		}
+	}
+	spin_unlock(&cache_defer_lock);
+
+	while (!list_empty(&pending)) {
+		dreq = list_entry(pending.next, struct cache_deferred_req, recent);
+		list_del_init(&dreq->recent);
+		dreq->revisit(dreq, 1);
+	}
+}
+
+/*
+ * communicate with user-space
+ *
+ * We have a magic /proc file - /proc/sunrpc/<cachename>/channel.
+ * On read, you get a full request, or block.
+ * On write, an update request is processed.
+ * Poll works if anything to read, and always allows write.
+ *
+ * Implemented by linked list of requests.  Each open file has
+ * a ->private that also exists in this list.  New requests are added
+ * to the end and may wakeup and preceding readers.
+ * New readers are added to the head.  If, on read, an item is found with
+ * CACHE_UPCALLING clear, we free it from the list.
+ *
+ */
+
+static DEFINE_SPINLOCK(queue_lock);
+static DEFINE_MUTEX(queue_io_mutex);
+
+struct cache_queue {
+	struct list_head	list;
+	int			reader;	/* if 0, then request */
+};
+struct cache_request {
+	struct cache_queue	q;
+	struct cache_head	*item;
+	char			* buf;
+	int			len;
+	int			readers;
+};
+struct cache_reader {
+	struct cache_queue	q;
+	int			offset;	/* if non-0, we have a refcnt on next request */
+};
+
+static int cache_request(struct cache_detail *detail,
+			       struct cache_request *crq)
+{
+	char *bp = crq->buf;
+	int len = PAGE_SIZE;
+
+	detail->cache_request(detail, crq->item, &bp, &len);
+	if (len < 0)
+		return -EAGAIN;
+	return PAGE_SIZE - len;
+}
+
+static ssize_t cache_read(struct file *filp, char __user *buf, size_t count,
+			  loff_t *ppos, struct cache_detail *cd)
+{
+	struct cache_reader *rp = filp->private_data;
+	struct cache_request *rq;
+	struct inode *inode = file_inode(filp);
+	int err;
+
+	if (count == 0)
+		return 0;
+
+	mutex_lock(&inode->i_mutex); /* protect against multiple concurrent
+			      * readers on this file */
+ again:
+	spin_lock(&queue_lock);
+	/* need to find next request */
+	while (rp->q.list.next != &cd->queue &&
+	       list_entry(rp->q.list.next, struct cache_queue, list)
+	       ->reader) {
+		struct list_head *next = rp->q.list.next;
+		list_move(&rp->q.list, next);
+	}
+	if (rp->q.list.next == &cd->queue) {
+		spin_unlock(&queue_lock);
+		mutex_unlock(&inode->i_mutex);
+		WARN_ON_ONCE(rp->offset);
+		return 0;
+	}
+	rq = container_of(rp->q.list.next, struct cache_request, q.list);
+	WARN_ON_ONCE(rq->q.reader);
+	if (rp->offset == 0)
+		rq->readers++;
+	spin_unlock(&queue_lock);
+
+	if (rq->len == 0) {
+		err = cache_request(cd, rq);
+		if (err < 0)
+			goto out;
+		rq->len = err;
+	}
+
+	if (rp->offset == 0 && !test_bit(CACHE_PENDING, &rq->item->flags)) {
+		err = -EAGAIN;
+		spin_lock(&queue_lock);
+		list_move(&rp->q.list, &rq->q.list);
+		spin_unlock(&queue_lock);
+	} else {
+		if (rp->offset + count > rq->len)
+			count = rq->len - rp->offset;
+		err = -EFAULT;
+		if (copy_to_user(buf, rq->buf + rp->offset, count))
+			goto out;
+		rp->offset += count;
+		if (rp->offset >= rq->len) {
+			rp->offset = 0;
+			spin_lock(&queue_lock);
+			list_move(&rp->q.list, &rq->q.list);
+			spin_unlock(&queue_lock);
+		}
+		err = 0;
+	}
+ out:
+	if (rp->offset == 0) {
+		/* need to release rq */
+		spin_lock(&queue_lock);
+		rq->readers--;
+		if (rq->readers == 0 &&
+		    !test_bit(CACHE_PENDING, &rq->item->flags)) {
+			list_del(&rq->q.list);
+			spin_unlock(&queue_lock);
+			cache_put(rq->item, cd);
+			kfree(rq->buf);
+			kfree(rq);
+		} else
+			spin_unlock(&queue_lock);
+	}
+	if (err == -EAGAIN)
+		goto again;
+	mutex_unlock(&inode->i_mutex);
+	return err ? err :  count;
+}
+
+static ssize_t cache_do_downcall(char *kaddr, const char __user *buf,
+				 size_t count, struct cache_detail *cd)
+{
+	ssize_t ret;
+
+	if (count == 0)
+		return -EINVAL;
+	if (copy_from_user(kaddr, buf, count))
+		return -EFAULT;
+	kaddr[count] = '\0';
+	ret = cd->cache_parse(cd, kaddr, count);
+	if (!ret)
+		ret = count;
+	return ret;
+}
+
+static ssize_t cache_slow_downcall(const char __user *buf,
+				   size_t count, struct cache_detail *cd)
+{
+	static char write_buf[8192]; /* protected by queue_io_mutex */
+	ssize_t ret = -EINVAL;
+
+	if (count >= sizeof(write_buf))
+		goto out;
+	mutex_lock(&queue_io_mutex);
+	ret = cache_do_downcall(write_buf, buf, count, cd);
+	mutex_unlock(&queue_io_mutex);
+out:
+	return ret;
+}
+
+static ssize_t cache_downcall(struct address_space *mapping,
+			      const char __user *buf,
+			      size_t count, struct cache_detail *cd)
+{
+	struct page *page;
+	char *kaddr;
+	ssize_t ret = -ENOMEM;
+
+	if (count >= PAGE_CACHE_SIZE)
+		goto out_slow;
+
+	page = find_or_create_page(mapping, 0, GFP_KERNEL);
+	if (!page)
+		goto out_slow;
+
+	kaddr = kmap(page);
+	ret = cache_do_downcall(kaddr, buf, count, cd);
+	kunmap(page);
+	unlock_page(page);
+	page_cache_release(page);
+	return ret;
+out_slow:
+	return cache_slow_downcall(buf, count, cd);
+}
+
+static ssize_t cache_write(struct file *filp, const char __user *buf,
+			   size_t count, loff_t *ppos,
+			   struct cache_detail *cd)
+{
+	struct address_space *mapping = filp->f_mapping;
+	struct inode *inode = file_inode(filp);
+	ssize_t ret = -EINVAL;
+
+	if (!cd->cache_parse)
+		goto out;
+
+	mutex_lock(&inode->i_mutex);
+	ret = cache_downcall(mapping, buf, count, cd);
+	mutex_unlock(&inode->i_mutex);
+out:
+	return ret;
+}
+
+static DECLARE_WAIT_QUEUE_HEAD(queue_wait);
+
+static unsigned int cache_poll(struct file *filp, poll_table *wait,
+			       struct cache_detail *cd)
+{
+	unsigned int mask;
+	struct cache_reader *rp = filp->private_data;
+	struct cache_queue *cq;
+
+	poll_wait(filp, &queue_wait, wait);
+
+	/* alway allow write */
+	mask = POLLOUT | POLLWRNORM;
+
+	if (!rp)
+		return mask;
+
+	spin_lock(&queue_lock);
+
+	for (cq= &rp->q; &cq->list != &cd->queue;
+	     cq = list_entry(cq->list.next, struct cache_queue, list))
+		if (!cq->reader) {
+			mask |= POLLIN | POLLRDNORM;
+			break;
+		}
+	spin_unlock(&queue_lock);
+	return mask;
+}
+
+static int cache_ioctl(struct inode *ino, struct file *filp,
+		       unsigned int cmd, unsigned long arg,
+		       struct cache_detail *cd)
+{
+	int len = 0;
+	struct cache_reader *rp = filp->private_data;
+	struct cache_queue *cq;
+
+	if (cmd != FIONREAD || !rp)
+		return -EINVAL;
+
+	spin_lock(&queue_lock);
+
+	/* only find the length remaining in current request,
+	 * or the length of the next request
+	 */
+	for (cq= &rp->q; &cq->list != &cd->queue;
+	     cq = list_entry(cq->list.next, struct cache_queue, list))
+		if (!cq->reader) {
+			struct cache_request *cr =
+				container_of(cq, struct cache_request, q);
+			len = cr->len - rp->offset;
+			break;
+		}
+	spin_unlock(&queue_lock);
+
+	return put_user(len, (int __user *)arg);
+}
+
+static int cache_open(struct inode *inode, struct file *filp,
+		      struct cache_detail *cd)
+{
+	struct cache_reader *rp = NULL;
+
+	if (!cd || !try_module_get(cd->owner))
+		return -EACCES;
+	nonseekable_open(inode, filp);
+	if (filp->f_mode & FMODE_READ) {
+		rp = kmalloc(sizeof(*rp), GFP_KERNEL);
+		if (!rp) {
+			module_put(cd->owner);
+			return -ENOMEM;
+		}
+		rp->offset = 0;
+		rp->q.reader = 1;
+		atomic_inc(&cd->readers);
+		spin_lock(&queue_lock);
+		list_add(&rp->q.list, &cd->queue);
+		spin_unlock(&queue_lock);
+	}
+	filp->private_data = rp;
+	return 0;
+}
+
+static int cache_release(struct inode *inode, struct file *filp,
+			 struct cache_detail *cd)
+{
+	struct cache_reader *rp = filp->private_data;
+
+	if (rp) {
+		spin_lock(&queue_lock);
+		if (rp->offset) {
+			struct cache_queue *cq;
+			for (cq= &rp->q; &cq->list != &cd->queue;
+			     cq = list_entry(cq->list.next, struct cache_queue, list))
+				if (!cq->reader) {
+					container_of(cq, struct cache_request, q)
+						->readers--;
+					break;
+				}
+			rp->offset = 0;
+		}
+		list_del(&rp->q.list);
+		spin_unlock(&queue_lock);
+
+		filp->private_data = NULL;
+		kfree(rp);
+
+		cd->last_close = seconds_since_boot();
+		atomic_dec(&cd->readers);
+	}
+	module_put(cd->owner);
+	return 0;
+}
+
+
+
+static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch)
+{
+	struct cache_queue *cq, *tmp;
+	struct cache_request *cr;
+	struct list_head dequeued;
+
+	INIT_LIST_HEAD(&dequeued);
+	spin_lock(&queue_lock);
+	list_for_each_entry_safe(cq, tmp, &detail->queue, list)
+		if (!cq->reader) {
+			cr = container_of(cq, struct cache_request, q);
+			if (cr->item != ch)
+				continue;
+			if (test_bit(CACHE_PENDING, &ch->flags))
+				/* Lost a race and it is pending again */
+				break;
+			if (cr->readers != 0)
+				continue;
+			list_move(&cr->q.list, &dequeued);
+		}
+	spin_unlock(&queue_lock);
+	while (!list_empty(&dequeued)) {
+		cr = list_entry(dequeued.next, struct cache_request, q.list);
+		list_del(&cr->q.list);
+		cache_put(cr->item, detail);
+		kfree(cr->buf);
+		kfree(cr);
+	}
+}
+
+/*
+ * Support routines for text-based upcalls.
+ * Fields are separated by spaces.
+ * Fields are either mangled to quote space tab newline slosh with slosh
+ * or a hexified with a leading \x
+ * Record is terminated with newline.
+ *
+ */
+
+void qword_add(char **bpp, int *lp, char *str)
+{
+	char *bp = *bpp;
+	int len = *lp;
+	int ret;
+
+	if (len < 0) return;
+
+	ret = string_escape_str(str, bp, len, ESCAPE_OCTAL, "\\ \n\t");
+	if (ret >= len) {
+		bp += len;
+		len = -1;
+	} else {
+		bp += ret;
+		len -= ret;
+		*bp++ = ' ';
+		len--;
+	}
+	*bpp = bp;
+	*lp = len;
+}
+EXPORT_SYMBOL_GPL(qword_add);
+
+void qword_addhex(char **bpp, int *lp, char *buf, int blen)
+{
+	char *bp = *bpp;
+	int len = *lp;
+
+	if (len < 0) return;
+
+	if (len > 2) {
+		*bp++ = '\\';
+		*bp++ = 'x';
+		len -= 2;
+		while (blen && len >= 2) {
+			bp = hex_byte_pack(bp, *buf++);
+			len -= 2;
+			blen--;
+		}
+	}
+	if (blen || len<1) len = -1;
+	else {
+		*bp++ = ' ';
+		len--;
+	}
+	*bpp = bp;
+	*lp = len;
+}
+EXPORT_SYMBOL_GPL(qword_addhex);
+
+static void warn_no_listener(struct cache_detail *detail)
+{
+	if (detail->last_warn != detail->last_close) {
+		detail->last_warn = detail->last_close;
+		if (detail->warn_no_listener)
+			detail->warn_no_listener(detail, detail->last_close != 0);
+	}
+}
+
+static bool cache_listeners_exist(struct cache_detail *detail)
+{
+	if (atomic_read(&detail->readers))
+		return true;
+	if (detail->last_close == 0)
+		/* This cache was never opened */
+		return false;
+	if (detail->last_close < seconds_since_boot() - 30)
+		/*
+		 * We allow for the possibility that someone might
+		 * restart a userspace daemon without restarting the
+		 * server; but after 30 seconds, we give up.
+		 */
+		 return false;
+	return true;
+}
+
+/*
+ * register an upcall request to user-space and queue it up for read() by the
+ * upcall daemon.
+ *
+ * Each request is at most one page long.
+ */
+int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
+{
+
+	char *buf;
+	struct cache_request *crq;
+	int ret = 0;
+
+	if (!detail->cache_request)
+		return -EINVAL;
+
+	if (!cache_listeners_exist(detail)) {
+		warn_no_listener(detail);
+		return -EINVAL;
+	}
+	if (test_bit(CACHE_CLEANED, &h->flags))
+		/* Too late to make an upcall */
+		return -EAGAIN;
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -EAGAIN;
+
+	crq = kmalloc(sizeof (*crq), GFP_KERNEL);
+	if (!crq) {
+		kfree(buf);
+		return -EAGAIN;
+	}
+
+	crq->q.reader = 0;
+	crq->item = cache_get(h);
+	crq->buf = buf;
+	crq->len = 0;
+	crq->readers = 0;
+	spin_lock(&queue_lock);
+	if (test_bit(CACHE_PENDING, &h->flags))
+		list_add_tail(&crq->q.list, &detail->queue);
+	else
+		/* Lost a race, no longer PENDING, so don't enqueue */
+		ret = -EAGAIN;
+	spin_unlock(&queue_lock);
+	wake_up(&queue_wait);
+	if (ret == -EAGAIN) {
+		kfree(buf);
+		kfree(crq);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall);
+
+/*
+ * parse a message from user-space and pass it
+ * to an appropriate cache
+ * Messages are, like requests, separated into fields by
+ * spaces and dequotes as \xHEXSTRING or embedded \nnn octal
+ *
+ * Message is
+ *   reply cachename expiry key ... content....
+ *
+ * key and content are both parsed by cache
+ */
+
+int qword_get(char **bpp, char *dest, int bufsize)
+{
+	/* return bytes copied, or -1 on error */
+	char *bp = *bpp;
+	int len = 0;
+
+	while (*bp == ' ') bp++;
+
+	if (bp[0] == '\\' && bp[1] == 'x') {
+		/* HEX STRING */
+		bp += 2;
+		while (len < bufsize) {
+			int h, l;
+
+			h = hex_to_bin(bp[0]);
+			if (h < 0)
+				break;
+
+			l = hex_to_bin(bp[1]);
+			if (l < 0)
+				break;
+
+			*dest++ = (h << 4) | l;
+			bp += 2;
+			len++;
+		}
+	} else {
+		/* text with \nnn octal quoting */
+		while (*bp != ' ' && *bp != '\n' && *bp && len < bufsize-1) {
+			if (*bp == '\\' &&
+			    isodigit(bp[1]) && (bp[1] <= '3') &&
+			    isodigit(bp[2]) &&
+			    isodigit(bp[3])) {
+				int byte = (*++bp -'0');
+				bp++;
+				byte = (byte << 3) | (*bp++ - '0');
+				byte = (byte << 3) | (*bp++ - '0');
+				*dest++ = byte;
+				len++;
+			} else {
+				*dest++ = *bp++;
+				len++;
+			}
+		}
+	}
+
+	if (*bp != ' ' && *bp != '\n' && *bp != '\0')
+		return -1;
+	while (*bp == ' ') bp++;
+	*bpp = bp;
+	*dest = '\0';
+	return len;
+}
+EXPORT_SYMBOL_GPL(qword_get);
+
+
+/*
+ * support /proc/sunrpc/cache/$CACHENAME/content
+ * as a seqfile.
+ * We call ->cache_show passing NULL for the item to
+ * get a header, then pass each real item in the cache
+ */
+
+struct handle {
+	struct cache_detail *cd;
+};
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+	__acquires(cd->hash_lock)
+{
+	loff_t n = *pos;
+	unsigned int hash, entry;
+	struct cache_head *ch;
+	struct cache_detail *cd = ((struct handle*)m->private)->cd;
+
+
+	read_lock(&cd->hash_lock);
+	if (!n--)
+		return SEQ_START_TOKEN;
+	hash = n >> 32;
+	entry = n & ((1LL<<32) - 1);
+
+	for (ch=cd->hash_table[hash]; ch; ch=ch->next)
+		if (!entry--)
+			return ch;
+	n &= ~((1LL<<32) - 1);
+	do {
+		hash++;
+		n += 1LL<<32;
+	} while(hash < cd->hash_size &&
+		cd->hash_table[hash]==NULL);
+	if (hash >= cd->hash_size)
+		return NULL;
+	*pos = n+1;
+	return cd->hash_table[hash];
+}
+
+static void *c_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	struct cache_head *ch = p;
+	int hash = (*pos >> 32);
+	struct cache_detail *cd = ((struct handle*)m->private)->cd;
+
+	if (p == SEQ_START_TOKEN)
+		hash = 0;
+	else if (ch->next == NULL) {
+		hash++;
+		*pos += 1LL<<32;
+	} else {
+		++*pos;
+		return ch->next;
+	}
+	*pos &= ~((1LL<<32) - 1);
+	while (hash < cd->hash_size &&
+	       cd->hash_table[hash] == NULL) {
+		hash++;
+		*pos += 1LL<<32;
+	}
+	if (hash >= cd->hash_size)
+		return NULL;
+	++*pos;
+	return cd->hash_table[hash];
+}
+
+static void c_stop(struct seq_file *m, void *p)
+	__releases(cd->hash_lock)
+{
+	struct cache_detail *cd = ((struct handle*)m->private)->cd;
+	read_unlock(&cd->hash_lock);
+}
+
+static int c_show(struct seq_file *m, void *p)
+{
+	struct cache_head *cp = p;
+	struct cache_detail *cd = ((struct handle*)m->private)->cd;
+
+	if (p == SEQ_START_TOKEN)
+		return cd->cache_show(m, cd, NULL);
+
+	ifdebug(CACHE)
+		seq_printf(m, "# expiry=%ld refcnt=%d flags=%lx\n",
+			   convert_to_wallclock(cp->expiry_time),
+			   atomic_read(&cp->ref.refcount), cp->flags);
+	cache_get(cp);
+	if (cache_check(cd, cp, NULL))
+		/* cache_check does a cache_put on failure */
+		seq_printf(m, "# ");
+	else {
+		if (cache_is_expired(cd, cp))
+			seq_printf(m, "# ");
+		cache_put(cp, cd);
+	}
+
+	return cd->cache_show(m, cd, cp);
+}
+
+static const struct seq_operations cache_content_op = {
+	.start	= c_start,
+	.next	= c_next,
+	.stop	= c_stop,
+	.show	= c_show,
+};
+
+static int content_open(struct inode *inode, struct file *file,
+			struct cache_detail *cd)
+{
+	struct handle *han;
+
+	if (!cd || !try_module_get(cd->owner))
+		return -EACCES;
+	han = __seq_open_private(file, &cache_content_op, sizeof(*han));
+	if (han == NULL) {
+		module_put(cd->owner);
+		return -ENOMEM;
+	}
+
+	han->cd = cd;
+	return 0;
+}
+
+static int content_release(struct inode *inode, struct file *file,
+		struct cache_detail *cd)
+{
+	int ret = seq_release_private(inode, file);
+	module_put(cd->owner);
+	return ret;
+}
+
+static int open_flush(struct inode *inode, struct file *file,
+			struct cache_detail *cd)
+{
+	if (!cd || !try_module_get(cd->owner))
+		return -EACCES;
+	return nonseekable_open(inode, file);
+}
+
+static int release_flush(struct inode *inode, struct file *file,
+			struct cache_detail *cd)
+{
+	module_put(cd->owner);
+	return 0;
+}
+
+static ssize_t read_flush(struct file *file, char __user *buf,
+			  size_t count, loff_t *ppos,
+			  struct cache_detail *cd)
+{
+	char tbuf[22];
+	unsigned long p = *ppos;
+	size_t len;
+
+	snprintf(tbuf, sizeof(tbuf), "%lu\n", convert_to_wallclock(cd->flush_time));
+	len = strlen(tbuf);
+	if (p >= len)
+		return 0;
+	len -= p;
+	if (len > count)
+		len = count;
+	if (copy_to_user(buf, (void*)(tbuf+p), len))
+		return -EFAULT;
+	*ppos += len;
+	return len;
+}
+
+static ssize_t write_flush(struct file *file, const char __user *buf,
+			   size_t count, loff_t *ppos,
+			   struct cache_detail *cd)
+{
+	char tbuf[20];
+	char *bp, *ep;
+
+	if (*ppos || count > sizeof(tbuf)-1)
+		return -EINVAL;
+	if (copy_from_user(tbuf, buf, count))
+		return -EFAULT;
+	tbuf[count] = 0;
+	simple_strtoul(tbuf, &ep, 0);
+	if (*ep && *ep != '\n')
+		return -EINVAL;
+
+	bp = tbuf;
+	cd->flush_time = get_expiry(&bp);
+	cd->nextcheck = seconds_since_boot();
+	cache_flush();
+
+	*ppos += count;
+	return count;
+}
+
+static ssize_t cache_read_procfs(struct file *filp, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = PDE_DATA(file_inode(filp));
+
+	return cache_read(filp, buf, count, ppos, cd);
+}
+
+static ssize_t cache_write_procfs(struct file *filp, const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = PDE_DATA(file_inode(filp));
+
+	return cache_write(filp, buf, count, ppos, cd);
+}
+
+static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait)
+{
+	struct cache_detail *cd = PDE_DATA(file_inode(filp));
+
+	return cache_poll(filp, wait, cd);
+}
+
+static long cache_ioctl_procfs(struct file *filp,
+			       unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return cache_ioctl(inode, filp, cmd, arg, cd);
+}
+
+static int cache_open_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return cache_open(inode, filp, cd);
+}
+
+static int cache_release_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return cache_release(inode, filp, cd);
+}
+
+static const struct file_operations cache_file_operations_procfs = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= cache_read_procfs,
+	.write		= cache_write_procfs,
+	.poll		= cache_poll_procfs,
+	.unlocked_ioctl	= cache_ioctl_procfs, /* for FIONREAD */
+	.open		= cache_open_procfs,
+	.release	= cache_release_procfs,
+};
+
+static int content_open_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return content_open(inode, filp, cd);
+}
+
+static int content_release_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return content_release(inode, filp, cd);
+}
+
+static const struct file_operations content_file_operations_procfs = {
+	.open		= content_open_procfs,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= content_release_procfs,
+};
+
+static int open_flush_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return open_flush(inode, filp, cd);
+}
+
+static int release_flush_procfs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = PDE_DATA(inode);
+
+	return release_flush(inode, filp, cd);
+}
+
+static ssize_t read_flush_procfs(struct file *filp, char __user *buf,
+			    size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = PDE_DATA(file_inode(filp));
+
+	return read_flush(filp, buf, count, ppos, cd);
+}
+
+static ssize_t write_flush_procfs(struct file *filp,
+				  const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = PDE_DATA(file_inode(filp));
+
+	return write_flush(filp, buf, count, ppos, cd);
+}
+
+static const struct file_operations cache_flush_operations_procfs = {
+	.open		= open_flush_procfs,
+	.read		= read_flush_procfs,
+	.write		= write_flush_procfs,
+	.release	= release_flush_procfs,
+	.llseek		= no_llseek,
+};
+
+static void remove_cache_proc_entries(struct cache_detail *cd, struct net *net)
+{
+	struct sunrpc_net *sn;
+
+	if (cd->u.procfs.proc_ent == NULL)
+		return;
+	if (cd->u.procfs.flush_ent)
+		remove_proc_entry("flush", cd->u.procfs.proc_ent);
+	if (cd->u.procfs.channel_ent)
+		remove_proc_entry("channel", cd->u.procfs.proc_ent);
+	if (cd->u.procfs.content_ent)
+		remove_proc_entry("content", cd->u.procfs.proc_ent);
+	cd->u.procfs.proc_ent = NULL;
+	sn = net_generic(net, sunrpc_net_id);
+	remove_proc_entry(cd->name, sn->proc_net_rpc);
+}
+
+#ifdef CONFIG_PROC_FS
+static int create_cache_proc_entries(struct cache_detail *cd, struct net *net)
+{
+	struct proc_dir_entry *p;
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	cd->u.procfs.proc_ent = proc_mkdir(cd->name, sn->proc_net_rpc);
+	if (cd->u.procfs.proc_ent == NULL)
+		goto out_nomem;
+	cd->u.procfs.channel_ent = NULL;
+	cd->u.procfs.content_ent = NULL;
+
+	p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR,
+			     cd->u.procfs.proc_ent,
+			     &cache_flush_operations_procfs, cd);
+	cd->u.procfs.flush_ent = p;
+	if (p == NULL)
+		goto out_nomem;
+
+	if (cd->cache_request || cd->cache_parse) {
+		p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
+				     cd->u.procfs.proc_ent,
+				     &cache_file_operations_procfs, cd);
+		cd->u.procfs.channel_ent = p;
+		if (p == NULL)
+			goto out_nomem;
+	}
+	if (cd->cache_show) {
+		p = proc_create_data("content", S_IFREG|S_IRUSR,
+				cd->u.procfs.proc_ent,
+				&content_file_operations_procfs, cd);
+		cd->u.procfs.content_ent = p;
+		if (p == NULL)
+			goto out_nomem;
+	}
+	return 0;
+out_nomem:
+	remove_cache_proc_entries(cd, net);
+	return -ENOMEM;
+}
+#else /* CONFIG_PROC_FS */
+static int create_cache_proc_entries(struct cache_detail *cd, struct net *net)
+{
+	return 0;
+}
+#endif
+
+void __init cache_initialize(void)
+{
+	INIT_DEFERRABLE_WORK(&cache_cleaner, do_cache_clean);
+}
+
+int cache_register_net(struct cache_detail *cd, struct net *net)
+{
+	int ret;
+
+	sunrpc_init_cache_detail(cd);
+	ret = create_cache_proc_entries(cd, net);
+	if (ret)
+		sunrpc_destroy_cache_detail(cd);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cache_register_net);
+
+void cache_unregister_net(struct cache_detail *cd, struct net *net)
+{
+	remove_cache_proc_entries(cd, net);
+	sunrpc_destroy_cache_detail(cd);
+}
+EXPORT_SYMBOL_GPL(cache_unregister_net);
+
+struct cache_detail *cache_create_net(struct cache_detail *tmpl, struct net *net)
+{
+	struct cache_detail *cd;
+
+	cd = kmemdup(tmpl, sizeof(struct cache_detail), GFP_KERNEL);
+	if (cd == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	cd->hash_table = kzalloc(cd->hash_size * sizeof(struct cache_head *),
+				 GFP_KERNEL);
+	if (cd->hash_table == NULL) {
+		kfree(cd);
+		return ERR_PTR(-ENOMEM);
+	}
+	cd->net = net;
+	return cd;
+}
+EXPORT_SYMBOL_GPL(cache_create_net);
+
+void cache_destroy_net(struct cache_detail *cd, struct net *net)
+{
+	kfree(cd->hash_table);
+	kfree(cd);
+}
+EXPORT_SYMBOL_GPL(cache_destroy_net);
+
+static ssize_t cache_read_pipefs(struct file *filp, char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = RPC_I(file_inode(filp))->private;
+
+	return cache_read(filp, buf, count, ppos, cd);
+}
+
+static ssize_t cache_write_pipefs(struct file *filp, const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = RPC_I(file_inode(filp))->private;
+
+	return cache_write(filp, buf, count, ppos, cd);
+}
+
+static unsigned int cache_poll_pipefs(struct file *filp, poll_table *wait)
+{
+	struct cache_detail *cd = RPC_I(file_inode(filp))->private;
+
+	return cache_poll(filp, wait, cd);
+}
+
+static long cache_ioctl_pipefs(struct file *filp,
+			      unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return cache_ioctl(inode, filp, cmd, arg, cd);
+}
+
+static int cache_open_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return cache_open(inode, filp, cd);
+}
+
+static int cache_release_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return cache_release(inode, filp, cd);
+}
+
+const struct file_operations cache_file_operations_pipefs = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= cache_read_pipefs,
+	.write		= cache_write_pipefs,
+	.poll		= cache_poll_pipefs,
+	.unlocked_ioctl	= cache_ioctl_pipefs, /* for FIONREAD */
+	.open		= cache_open_pipefs,
+	.release	= cache_release_pipefs,
+};
+
+static int content_open_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return content_open(inode, filp, cd);
+}
+
+static int content_release_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return content_release(inode, filp, cd);
+}
+
+const struct file_operations content_file_operations_pipefs = {
+	.open		= content_open_pipefs,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= content_release_pipefs,
+};
+
+static int open_flush_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return open_flush(inode, filp, cd);
+}
+
+static int release_flush_pipefs(struct inode *inode, struct file *filp)
+{
+	struct cache_detail *cd = RPC_I(inode)->private;
+
+	return release_flush(inode, filp, cd);
+}
+
+static ssize_t read_flush_pipefs(struct file *filp, char __user *buf,
+			    size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = RPC_I(file_inode(filp))->private;
+
+	return read_flush(filp, buf, count, ppos, cd);
+}
+
+static ssize_t write_flush_pipefs(struct file *filp,
+				  const char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct cache_detail *cd = RPC_I(file_inode(filp))->private;
+
+	return write_flush(filp, buf, count, ppos, cd);
+}
+
+const struct file_operations cache_flush_operations_pipefs = {
+	.open		= open_flush_pipefs,
+	.read		= read_flush_pipefs,
+	.write		= write_flush_pipefs,
+	.release	= release_flush_pipefs,
+	.llseek		= no_llseek,
+};
+
+int sunrpc_cache_register_pipefs(struct dentry *parent,
+				 const char *name, umode_t umode,
+				 struct cache_detail *cd)
+{
+	struct dentry *dir = rpc_create_cache_dir(parent, name, umode, cd);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	cd->u.pipefs.dir = dir;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sunrpc_cache_register_pipefs);
+
+void sunrpc_cache_unregister_pipefs(struct cache_detail *cd)
+{
+	rpc_remove_cache_dir(cd->u.pipefs.dir);
+	cd->u.pipefs.dir = NULL;
+}
+EXPORT_SYMBOL_GPL(sunrpc_cache_unregister_pipefs);
+
diff --git a/kernel/net/sunrpc/clnt.c b/kernel/net/sunrpc/clnt.c
new file mode 100644
index 000000000..e6ce15173
--- /dev/null
+++ b/kernel/net/sunrpc/clnt.c
@@ -0,0 +1,2478 @@
+/*
+ *  linux/net/sunrpc/clnt.c
+ *
+ *  This file contains the high-level RPC interface.
+ *  It is modeled as a finite state machine to support both synchronous
+ *  and asynchronous requests.
+ *
+ *  -	RPC header generation and argument serialization.
+ *  -	Credential refresh.
+ *  -	TCP connect handling.
+ *  -	Retry of operation when it is suspected the operation failed because
+ *	of uid squashing on the server, or when the credentials were stale
+ *	and need to be refreshed, or when a packet was damaged in transit.
+ *	This may be have to be moved to the VFS layer.
+ *
+ *  Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
+ *  Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kallsyms.h>
+#include <linux/mm.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/rcupdate.h>
+#include <linux/utsname.h>
+#include <linux/workqueue.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/un.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/bc_xprt.h>
+#include <trace/events/sunrpc.h>
+
+#include "sunrpc.h"
+#include "netns.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_CALL
+#endif
+
+#define dprint_status(t)					\
+	dprintk("RPC: %5u %s (status %d)\n", t->tk_pid,		\
+			__func__, t->tk_status)
+
+/*
+ * All RPC clients are linked into this list
+ */
+
+static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
+
+
+static void	call_start(struct rpc_task *task);
+static void	call_reserve(struct rpc_task *task);
+static void	call_reserveresult(struct rpc_task *task);
+static void	call_allocate(struct rpc_task *task);
+static void	call_decode(struct rpc_task *task);
+static void	call_bind(struct rpc_task *task);
+static void	call_bind_status(struct rpc_task *task);
+static void	call_transmit(struct rpc_task *task);
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static void	call_bc_transmit(struct rpc_task *task);
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+static void	call_status(struct rpc_task *task);
+static void	call_transmit_status(struct rpc_task *task);
+static void	call_refresh(struct rpc_task *task);
+static void	call_refreshresult(struct rpc_task *task);
+static void	call_timeout(struct rpc_task *task);
+static void	call_connect(struct rpc_task *task);
+static void	call_connect_status(struct rpc_task *task);
+
+static __be32	*rpc_encode_header(struct rpc_task *task);
+static __be32	*rpc_verify_header(struct rpc_task *task);
+static int	rpc_ping(struct rpc_clnt *clnt);
+
+static void rpc_register_client(struct rpc_clnt *clnt)
+{
+	struct net *net = rpc_net_ns(clnt);
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	spin_lock(&sn->rpc_client_lock);
+	list_add(&clnt->cl_clients, &sn->all_clients);
+	spin_unlock(&sn->rpc_client_lock);
+}
+
+static void rpc_unregister_client(struct rpc_clnt *clnt)
+{
+	struct net *net = rpc_net_ns(clnt);
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	spin_lock(&sn->rpc_client_lock);
+	list_del(&clnt->cl_clients);
+	spin_unlock(&sn->rpc_client_lock);
+}
+
+static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
+{
+	rpc_remove_client_dir(clnt);
+}
+
+static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
+{
+	struct net *net = rpc_net_ns(clnt);
+	struct super_block *pipefs_sb;
+
+	pipefs_sb = rpc_get_sb_net(net);
+	if (pipefs_sb) {
+		__rpc_clnt_remove_pipedir(clnt);
+		rpc_put_sb_net(net);
+	}
+}
+
+static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
+				    struct rpc_clnt *clnt)
+{
+	static uint32_t clntid;
+	const char *dir_name = clnt->cl_program->pipe_dir_name;
+	char name[15];
+	struct dentry *dir, *dentry;
+
+	dir = rpc_d_lookup_sb(sb, dir_name);
+	if (dir == NULL) {
+		pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
+		return dir;
+	}
+	for (;;) {
+		snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
+		name[sizeof(name) - 1] = '\0';
+		dentry = rpc_create_client_dir(dir, name, clnt);
+		if (!IS_ERR(dentry))
+			break;
+		if (dentry == ERR_PTR(-EEXIST))
+			continue;
+		printk(KERN_INFO "RPC: Couldn't create pipefs entry"
+				" %s/%s, error %ld\n",
+				dir_name, name, PTR_ERR(dentry));
+		break;
+	}
+	dput(dir);
+	return dentry;
+}
+
+static int
+rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
+{
+	struct dentry *dentry;
+
+	if (clnt->cl_program->pipe_dir_name != NULL) {
+		dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
+		if (IS_ERR(dentry))
+			return PTR_ERR(dentry);
+	}
+	return 0;
+}
+
+static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
+{
+	if (clnt->cl_program->pipe_dir_name == NULL)
+		return 1;
+
+	switch (event) {
+	case RPC_PIPEFS_MOUNT:
+		if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
+			return 1;
+		if (atomic_read(&clnt->cl_count) == 0)
+			return 1;
+		break;
+	case RPC_PIPEFS_UMOUNT:
+		if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
+			return 1;
+		break;
+	}
+	return 0;
+}
+
+static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
+				   struct super_block *sb)
+{
+	struct dentry *dentry;
+	int err = 0;
+
+	switch (event) {
+	case RPC_PIPEFS_MOUNT:
+		dentry = rpc_setup_pipedir_sb(sb, clnt);
+		if (!dentry)
+			return -ENOENT;
+		if (IS_ERR(dentry))
+			return PTR_ERR(dentry);
+		break;
+	case RPC_PIPEFS_UMOUNT:
+		__rpc_clnt_remove_pipedir(clnt);
+		break;
+	default:
+		printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
+		return -ENOTSUPP;
+	}
+	return err;
+}
+
+static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
+				struct super_block *sb)
+{
+	int error = 0;
+
+	for (;; clnt = clnt->cl_parent) {
+		if (!rpc_clnt_skip_event(clnt, event))
+			error = __rpc_clnt_handle_event(clnt, event, sb);
+		if (error || clnt == clnt->cl_parent)
+			break;
+	}
+	return error;
+}
+
+static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_clnt *clnt;
+
+	spin_lock(&sn->rpc_client_lock);
+	list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+		if (rpc_clnt_skip_event(clnt, event))
+			continue;
+		spin_unlock(&sn->rpc_client_lock);
+		return clnt;
+	}
+	spin_unlock(&sn->rpc_client_lock);
+	return NULL;
+}
+
+static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
+			    void *ptr)
+{
+	struct super_block *sb = ptr;
+	struct rpc_clnt *clnt;
+	int error = 0;
+
+	while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
+		error = __rpc_pipefs_event(clnt, event, sb);
+		if (error)
+			break;
+	}
+	return error;
+}
+
+static struct notifier_block rpc_clients_block = {
+	.notifier_call	= rpc_pipefs_event,
+	.priority	= SUNRPC_PIPEFS_RPC_PRIO,
+};
+
+int rpc_clients_notifier_register(void)
+{
+	return rpc_pipefs_notifier_register(&rpc_clients_block);
+}
+
+void rpc_clients_notifier_unregister(void)
+{
+	return rpc_pipefs_notifier_unregister(&rpc_clients_block);
+}
+
+static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
+		struct rpc_xprt *xprt,
+		const struct rpc_timeout *timeout)
+{
+	struct rpc_xprt *old;
+
+	spin_lock(&clnt->cl_lock);
+	old = rcu_dereference_protected(clnt->cl_xprt,
+			lockdep_is_held(&clnt->cl_lock));
+
+	if (!xprt_bound(xprt))
+		clnt->cl_autobind = 1;
+
+	clnt->cl_timeout = timeout;
+	rcu_assign_pointer(clnt->cl_xprt, xprt);
+	spin_unlock(&clnt->cl_lock);
+
+	return old;
+}
+
+static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
+{
+	clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
+			nodename, sizeof(clnt->cl_nodename));
+}
+
+static int rpc_client_register(struct rpc_clnt *clnt,
+			       rpc_authflavor_t pseudoflavor,
+			       const char *client_name)
+{
+	struct rpc_auth_create_args auth_args = {
+		.pseudoflavor = pseudoflavor,
+		.target_name = client_name,
+	};
+	struct rpc_auth *auth;
+	struct net *net = rpc_net_ns(clnt);
+	struct super_block *pipefs_sb;
+	int err;
+
+	rpc_clnt_debugfs_register(clnt);
+
+	pipefs_sb = rpc_get_sb_net(net);
+	if (pipefs_sb) {
+		err = rpc_setup_pipedir(pipefs_sb, clnt);
+		if (err)
+			goto out;
+	}
+
+	rpc_register_client(clnt);
+	if (pipefs_sb)
+		rpc_put_sb_net(net);
+
+	auth = rpcauth_create(&auth_args, clnt);
+	if (IS_ERR(auth)) {
+		dprintk("RPC:       Couldn't create auth handle (flavor %u)\n",
+				pseudoflavor);
+		err = PTR_ERR(auth);
+		goto err_auth;
+	}
+	return 0;
+err_auth:
+	pipefs_sb = rpc_get_sb_net(net);
+	rpc_unregister_client(clnt);
+	__rpc_clnt_remove_pipedir(clnt);
+out:
+	if (pipefs_sb)
+		rpc_put_sb_net(net);
+	rpc_clnt_debugfs_unregister(clnt);
+	return err;
+}
+
+static DEFINE_IDA(rpc_clids);
+
+static int rpc_alloc_clid(struct rpc_clnt *clnt)
+{
+	int clid;
+
+	clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
+	if (clid < 0)
+		return clid;
+	clnt->cl_clid = clid;
+	return 0;
+}
+
+static void rpc_free_clid(struct rpc_clnt *clnt)
+{
+	ida_simple_remove(&rpc_clids, clnt->cl_clid);
+}
+
+static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
+		struct rpc_xprt *xprt,
+		struct rpc_clnt *parent)
+{
+	const struct rpc_program *program = args->program;
+	const struct rpc_version *version;
+	struct rpc_clnt *clnt = NULL;
+	const struct rpc_timeout *timeout;
+	const char *nodename = args->nodename;
+	int err;
+
+	/* sanity check the name before trying to print it */
+	dprintk("RPC:       creating %s client for %s (xprt %p)\n",
+			program->name, args->servername, xprt);
+
+	err = rpciod_up();
+	if (err)
+		goto out_no_rpciod;
+
+	err = -EINVAL;
+	if (args->version >= program->nrvers)
+		goto out_err;
+	version = program->version[args->version];
+	if (version == NULL)
+		goto out_err;
+
+	err = -ENOMEM;
+	clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
+	if (!clnt)
+		goto out_err;
+	clnt->cl_parent = parent ? : clnt;
+
+	err = rpc_alloc_clid(clnt);
+	if (err)
+		goto out_no_clid;
+
+	clnt->cl_procinfo = version->procs;
+	clnt->cl_maxproc  = version->nrprocs;
+	clnt->cl_prog     = args->prognumber ? : program->number;
+	clnt->cl_vers     = version->number;
+	clnt->cl_stats    = program->stats;
+	clnt->cl_metrics  = rpc_alloc_iostats(clnt);
+	rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
+	err = -ENOMEM;
+	if (clnt->cl_metrics == NULL)
+		goto out_no_stats;
+	clnt->cl_program  = program;
+	INIT_LIST_HEAD(&clnt->cl_tasks);
+	spin_lock_init(&clnt->cl_lock);
+
+	timeout = xprt->timeout;
+	if (args->timeout != NULL) {
+		memcpy(&clnt->cl_timeout_default, args->timeout,
+				sizeof(clnt->cl_timeout_default));
+		timeout = &clnt->cl_timeout_default;
+	}
+
+	rpc_clnt_set_transport(clnt, xprt, timeout);
+
+	clnt->cl_rtt = &clnt->cl_rtt_default;
+	rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
+
+	atomic_set(&clnt->cl_count, 1);
+
+	if (nodename == NULL)
+		nodename = utsname()->nodename;
+	/* save the nodename */
+	rpc_clnt_set_nodename(clnt, nodename);
+
+	err = rpc_client_register(clnt, args->authflavor, args->client_name);
+	if (err)
+		goto out_no_path;
+	if (parent)
+		atomic_inc(&parent->cl_count);
+	return clnt;
+
+out_no_path:
+	rpc_free_iostats(clnt->cl_metrics);
+out_no_stats:
+	rpc_free_clid(clnt);
+out_no_clid:
+	kfree(clnt);
+out_err:
+	rpciod_down();
+out_no_rpciod:
+	xprt_put(xprt);
+	return ERR_PTR(err);
+}
+
+struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
+					struct rpc_xprt *xprt)
+{
+	struct rpc_clnt *clnt = NULL;
+
+	clnt = rpc_new_client(args, xprt, NULL);
+	if (IS_ERR(clnt))
+		return clnt;
+
+	if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
+		int err = rpc_ping(clnt);
+		if (err != 0) {
+			rpc_shutdown_client(clnt);
+			return ERR_PTR(err);
+		}
+	}
+
+	clnt->cl_softrtry = 1;
+	if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
+		clnt->cl_softrtry = 0;
+
+	if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
+		clnt->cl_autobind = 1;
+	if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
+		clnt->cl_noretranstimeo = 1;
+	if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
+		clnt->cl_discrtry = 1;
+	if (!(args->flags & RPC_CLNT_CREATE_QUIET))
+		clnt->cl_chatty = 1;
+
+	return clnt;
+}
+EXPORT_SYMBOL_GPL(rpc_create_xprt);
+
+/**
+ * rpc_create - create an RPC client and transport with one call
+ * @args: rpc_clnt create argument structure
+ *
+ * Creates and initializes an RPC transport and an RPC client.
+ *
+ * It can ping the server in order to determine if it is up, and to see if
+ * it supports this program and version.  RPC_CLNT_CREATE_NOPING disables
+ * this behavior so asynchronous tasks can also use rpc_create.
+ */
+struct rpc_clnt *rpc_create(struct rpc_create_args *args)
+{
+	struct rpc_xprt *xprt;
+	struct xprt_create xprtargs = {
+		.net = args->net,
+		.ident = args->protocol,
+		.srcaddr = args->saddress,
+		.dstaddr = args->address,
+		.addrlen = args->addrsize,
+		.servername = args->servername,
+		.bc_xprt = args->bc_xprt,
+	};
+	char servername[48];
+
+	if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
+		xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
+	if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
+		xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
+	/*
+	 * If the caller chooses not to specify a hostname, whip
+	 * up a string representation of the passed-in address.
+	 */
+	if (xprtargs.servername == NULL) {
+		struct sockaddr_un *sun =
+				(struct sockaddr_un *)args->address;
+		struct sockaddr_in *sin =
+				(struct sockaddr_in *)args->address;
+		struct sockaddr_in6 *sin6 =
+				(struct sockaddr_in6 *)args->address;
+
+		servername[0] = '\0';
+		switch (args->address->sa_family) {
+		case AF_LOCAL:
+			snprintf(servername, sizeof(servername), "%s",
+				 sun->sun_path);
+			break;
+		case AF_INET:
+			snprintf(servername, sizeof(servername), "%pI4",
+				 &sin->sin_addr.s_addr);
+			break;
+		case AF_INET6:
+			snprintf(servername, sizeof(servername), "%pI6",
+				 &sin6->sin6_addr);
+			break;
+		default:
+			/* caller wants default server name, but
+			 * address family isn't recognized. */
+			return ERR_PTR(-EINVAL);
+		}
+		xprtargs.servername = servername;
+	}
+
+	xprt = xprt_create_transport(&xprtargs);
+	if (IS_ERR(xprt))
+		return (struct rpc_clnt *)xprt;
+
+	/*
+	 * By default, kernel RPC client connects from a reserved port.
+	 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
+	 * but it is always enabled for rpciod, which handles the connect
+	 * operation.
+	 */
+	xprt->resvport = 1;
+	if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
+		xprt->resvport = 0;
+
+	return rpc_create_xprt(args, xprt);
+}
+EXPORT_SYMBOL_GPL(rpc_create);
+
+/*
+ * This function clones the RPC client structure. It allows us to share the
+ * same transport while varying parameters such as the authentication
+ * flavour.
+ */
+static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
+					   struct rpc_clnt *clnt)
+{
+	struct rpc_xprt *xprt;
+	struct rpc_clnt *new;
+	int err;
+
+	err = -ENOMEM;
+	rcu_read_lock();
+	xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+	rcu_read_unlock();
+	if (xprt == NULL)
+		goto out_err;
+	args->servername = xprt->servername;
+	args->nodename = clnt->cl_nodename;
+
+	new = rpc_new_client(args, xprt, clnt);
+	if (IS_ERR(new)) {
+		err = PTR_ERR(new);
+		goto out_err;
+	}
+
+	/* Turn off autobind on clones */
+	new->cl_autobind = 0;
+	new->cl_softrtry = clnt->cl_softrtry;
+	new->cl_noretranstimeo = clnt->cl_noretranstimeo;
+	new->cl_discrtry = clnt->cl_discrtry;
+	new->cl_chatty = clnt->cl_chatty;
+	return new;
+
+out_err:
+	dprintk("RPC:       %s: returned error %d\n", __func__, err);
+	return ERR_PTR(err);
+}
+
+/**
+ * rpc_clone_client - Clone an RPC client structure
+ *
+ * @clnt: RPC client whose parameters are copied
+ *
+ * Returns a fresh RPC client or an ERR_PTR.
+ */
+struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
+{
+	struct rpc_create_args args = {
+		.program	= clnt->cl_program,
+		.prognumber	= clnt->cl_prog,
+		.version	= clnt->cl_vers,
+		.authflavor	= clnt->cl_auth->au_flavor,
+	};
+	return __rpc_clone_client(&args, clnt);
+}
+EXPORT_SYMBOL_GPL(rpc_clone_client);
+
+/**
+ * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
+ *
+ * @clnt: RPC client whose parameters are copied
+ * @flavor: security flavor for new client
+ *
+ * Returns a fresh RPC client or an ERR_PTR.
+ */
+struct rpc_clnt *
+rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
+{
+	struct rpc_create_args args = {
+		.program	= clnt->cl_program,
+		.prognumber	= clnt->cl_prog,
+		.version	= clnt->cl_vers,
+		.authflavor	= flavor,
+	};
+	return __rpc_clone_client(&args, clnt);
+}
+EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
+
+/**
+ * rpc_switch_client_transport: switch the RPC transport on the fly
+ * @clnt: pointer to a struct rpc_clnt
+ * @args: pointer to the new transport arguments
+ * @timeout: pointer to the new timeout parameters
+ *
+ * This function allows the caller to switch the RPC transport for the
+ * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS
+ * server, for instance.  It assumes that the caller has ensured that
+ * there are no active RPC tasks by using some form of locking.
+ *
+ * Returns zero if "clnt" is now using the new xprt.  Otherwise a
+ * negative errno is returned, and "clnt" continues to use the old
+ * xprt.
+ */
+int rpc_switch_client_transport(struct rpc_clnt *clnt,
+		struct xprt_create *args,
+		const struct rpc_timeout *timeout)
+{
+	const struct rpc_timeout *old_timeo;
+	rpc_authflavor_t pseudoflavor;
+	struct rpc_xprt *xprt, *old;
+	struct rpc_clnt *parent;
+	int err;
+
+	xprt = xprt_create_transport(args);
+	if (IS_ERR(xprt)) {
+		dprintk("RPC:       failed to create new xprt for clnt %p\n",
+			clnt);
+		return PTR_ERR(xprt);
+	}
+
+	pseudoflavor = clnt->cl_auth->au_flavor;
+
+	old_timeo = clnt->cl_timeout;
+	old = rpc_clnt_set_transport(clnt, xprt, timeout);
+
+	rpc_unregister_client(clnt);
+	__rpc_clnt_remove_pipedir(clnt);
+	rpc_clnt_debugfs_unregister(clnt);
+
+	/*
+	 * A new transport was created.  "clnt" therefore
+	 * becomes the root of a new cl_parent tree.  clnt's
+	 * children, if it has any, still point to the old xprt.
+	 */
+	parent = clnt->cl_parent;
+	clnt->cl_parent = clnt;
+
+	/*
+	 * The old rpc_auth cache cannot be re-used.  GSS
+	 * contexts in particular are between a single
+	 * client and server.
+	 */
+	err = rpc_client_register(clnt, pseudoflavor, NULL);
+	if (err)
+		goto out_revert;
+
+	synchronize_rcu();
+	if (parent != clnt)
+		rpc_release_client(parent);
+	xprt_put(old);
+	dprintk("RPC:       replaced xprt for clnt %p\n", clnt);
+	return 0;
+
+out_revert:
+	rpc_clnt_set_transport(clnt, old, old_timeo);
+	clnt->cl_parent = parent;
+	rpc_client_register(clnt, pseudoflavor, NULL);
+	xprt_put(xprt);
+	dprintk("RPC:       failed to switch xprt for clnt %p\n", clnt);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
+
+/*
+ * Kill all tasks for the given client.
+ * XXX: kill their descendants as well?
+ */
+void rpc_killall_tasks(struct rpc_clnt *clnt)
+{
+	struct rpc_task	*rovr;
+
+
+	if (list_empty(&clnt->cl_tasks))
+		return;
+	dprintk("RPC:       killing all tasks for client %p\n", clnt);
+	/*
+	 * Spin lock all_tasks to prevent changes...
+	 */
+	spin_lock(&clnt->cl_lock);
+	list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
+		if (!RPC_IS_ACTIVATED(rovr))
+			continue;
+		if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
+			rovr->tk_flags |= RPC_TASK_KILLED;
+			rpc_exit(rovr, -EIO);
+			if (RPC_IS_QUEUED(rovr))
+				rpc_wake_up_queued_task(rovr->tk_waitqueue,
+							rovr);
+		}
+	}
+	spin_unlock(&clnt->cl_lock);
+}
+EXPORT_SYMBOL_GPL(rpc_killall_tasks);
+
+/*
+ * Properly shut down an RPC client, terminating all outstanding
+ * requests.
+ */
+void rpc_shutdown_client(struct rpc_clnt *clnt)
+{
+	might_sleep();
+
+	dprintk_rcu("RPC:       shutting down %s client for %s\n",
+			clnt->cl_program->name,
+			rcu_dereference(clnt->cl_xprt)->servername);
+
+	while (!list_empty(&clnt->cl_tasks)) {
+		rpc_killall_tasks(clnt);
+		wait_event_timeout(destroy_wait,
+			list_empty(&clnt->cl_tasks), 1*HZ);
+	}
+
+	rpc_release_client(clnt);
+}
+EXPORT_SYMBOL_GPL(rpc_shutdown_client);
+
+/*
+ * Free an RPC client
+ */
+static struct rpc_clnt *
+rpc_free_client(struct rpc_clnt *clnt)
+{
+	struct rpc_clnt *parent = NULL;
+
+	dprintk_rcu("RPC:       destroying %s client for %s\n",
+			clnt->cl_program->name,
+			rcu_dereference(clnt->cl_xprt)->servername);
+	if (clnt->cl_parent != clnt)
+		parent = clnt->cl_parent;
+	rpc_clnt_debugfs_unregister(clnt);
+	rpc_clnt_remove_pipedir(clnt);
+	rpc_unregister_client(clnt);
+	rpc_free_iostats(clnt->cl_metrics);
+	clnt->cl_metrics = NULL;
+	xprt_put(rcu_dereference_raw(clnt->cl_xprt));
+	rpciod_down();
+	rpc_free_clid(clnt);
+	kfree(clnt);
+	return parent;
+}
+
+/*
+ * Free an RPC client
+ */
+static struct rpc_clnt * 
+rpc_free_auth(struct rpc_clnt *clnt)
+{
+	if (clnt->cl_auth == NULL)
+		return rpc_free_client(clnt);
+
+	/*
+	 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
+	 *       release remaining GSS contexts. This mechanism ensures
+	 *       that it can do so safely.
+	 */
+	atomic_inc(&clnt->cl_count);
+	rpcauth_release(clnt->cl_auth);
+	clnt->cl_auth = NULL;
+	if (atomic_dec_and_test(&clnt->cl_count))
+		return rpc_free_client(clnt);
+	return NULL;
+}
+
+/*
+ * Release reference to the RPC client
+ */
+void
+rpc_release_client(struct rpc_clnt *clnt)
+{
+	dprintk("RPC:       rpc_release_client(%p)\n", clnt);
+
+	do {
+		if (list_empty(&clnt->cl_tasks))
+			wake_up(&destroy_wait);
+		if (!atomic_dec_and_test(&clnt->cl_count))
+			break;
+		clnt = rpc_free_auth(clnt);
+	} while (clnt != NULL);
+}
+EXPORT_SYMBOL_GPL(rpc_release_client);
+
+/**
+ * rpc_bind_new_program - bind a new RPC program to an existing client
+ * @old: old rpc_client
+ * @program: rpc program to set
+ * @vers: rpc program version
+ *
+ * Clones the rpc client and sets up a new RPC program. This is mainly
+ * of use for enabling different RPC programs to share the same transport.
+ * The Sun NFSv2/v3 ACL protocol can do this.
+ */
+struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
+				      const struct rpc_program *program,
+				      u32 vers)
+{
+	struct rpc_create_args args = {
+		.program	= program,
+		.prognumber	= program->number,
+		.version	= vers,
+		.authflavor	= old->cl_auth->au_flavor,
+	};
+	struct rpc_clnt *clnt;
+	int err;
+
+	clnt = __rpc_clone_client(&args, old);
+	if (IS_ERR(clnt))
+		goto out;
+	err = rpc_ping(clnt);
+	if (err != 0) {
+		rpc_shutdown_client(clnt);
+		clnt = ERR_PTR(err);
+	}
+out:
+	return clnt;
+}
+EXPORT_SYMBOL_GPL(rpc_bind_new_program);
+
+void rpc_task_release_client(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+
+	if (clnt != NULL) {
+		/* Remove from client task list */
+		spin_lock(&clnt->cl_lock);
+		list_del(&task->tk_task);
+		spin_unlock(&clnt->cl_lock);
+		task->tk_client = NULL;
+
+		rpc_release_client(clnt);
+	}
+}
+
+static
+void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
+{
+	if (clnt != NULL) {
+		rpc_task_release_client(task);
+		task->tk_client = clnt;
+		atomic_inc(&clnt->cl_count);
+		if (clnt->cl_softrtry)
+			task->tk_flags |= RPC_TASK_SOFT;
+		if (clnt->cl_noretranstimeo)
+			task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
+		if (sk_memalloc_socks()) {
+			struct rpc_xprt *xprt;
+
+			rcu_read_lock();
+			xprt = rcu_dereference(clnt->cl_xprt);
+			if (xprt->swapper)
+				task->tk_flags |= RPC_TASK_SWAPPER;
+			rcu_read_unlock();
+		}
+		/* Add to the client's list of all tasks */
+		spin_lock(&clnt->cl_lock);
+		list_add_tail(&task->tk_task, &clnt->cl_tasks);
+		spin_unlock(&clnt->cl_lock);
+	}
+}
+
+void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
+{
+	rpc_task_release_client(task);
+	rpc_task_set_client(task, clnt);
+}
+EXPORT_SYMBOL_GPL(rpc_task_reset_client);
+
+
+static void
+rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
+{
+	if (msg != NULL) {
+		task->tk_msg.rpc_proc = msg->rpc_proc;
+		task->tk_msg.rpc_argp = msg->rpc_argp;
+		task->tk_msg.rpc_resp = msg->rpc_resp;
+		if (msg->rpc_cred != NULL)
+			task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
+	}
+}
+
+/*
+ * Default callback for async RPC calls
+ */
+static void
+rpc_default_callback(struct rpc_task *task, void *data)
+{
+}
+
+static const struct rpc_call_ops rpc_default_ops = {
+	.rpc_call_done = rpc_default_callback,
+};
+
+/**
+ * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
+ * @task_setup_data: pointer to task initialisation data
+ */
+struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
+{
+	struct rpc_task *task;
+
+	task = rpc_new_task(task_setup_data);
+	if (IS_ERR(task))
+		goto out;
+
+	rpc_task_set_client(task, task_setup_data->rpc_client);
+	rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
+
+	if (task->tk_action == NULL)
+		rpc_call_start(task);
+
+	atomic_inc(&task->tk_count);
+	rpc_execute(task);
+out:
+	return task;
+}
+EXPORT_SYMBOL_GPL(rpc_run_task);
+
+/**
+ * rpc_call_sync - Perform a synchronous RPC call
+ * @clnt: pointer to RPC client
+ * @msg: RPC call parameters
+ * @flags: RPC call flags
+ */
+int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
+{
+	struct rpc_task	*task;
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = &rpc_default_ops,
+		.flags = flags,
+	};
+	int status;
+
+	WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
+	if (flags & RPC_TASK_ASYNC) {
+		rpc_release_calldata(task_setup_data.callback_ops,
+			task_setup_data.callback_data);
+		return -EINVAL;
+	}
+
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = task->tk_status;
+	rpc_put_task(task);
+	return status;
+}
+EXPORT_SYMBOL_GPL(rpc_call_sync);
+
+/**
+ * rpc_call_async - Perform an asynchronous RPC call
+ * @clnt: pointer to RPC client
+ * @msg: RPC call parameters
+ * @flags: RPC call flags
+ * @tk_ops: RPC call ops
+ * @data: user call data
+ */
+int
+rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
+	       const struct rpc_call_ops *tk_ops, void *data)
+{
+	struct rpc_task	*task;
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = tk_ops,
+		.callback_data = data,
+		.flags = flags|RPC_TASK_ASYNC,
+	};
+
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	rpc_put_task(task);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_call_async);
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/**
+ * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
+ * rpc_execute against it
+ * @req: RPC request
+ * @tk_ops: RPC call ops
+ */
+struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
+				const struct rpc_call_ops *tk_ops)
+{
+	struct rpc_task *task;
+	struct xdr_buf *xbufp = &req->rq_snd_buf;
+	struct rpc_task_setup task_setup_data = {
+		.callback_ops = tk_ops,
+	};
+
+	dprintk("RPC: rpc_run_bc_task req= %p\n", req);
+	/*
+	 * Create an rpc_task to send the data
+	 */
+	task = rpc_new_task(&task_setup_data);
+	if (IS_ERR(task)) {
+		xprt_free_bc_request(req);
+		goto out;
+	}
+	task->tk_rqstp = req;
+
+	/*
+	 * Set up the xdr_buf length.
+	 * This also indicates that the buffer is XDR encoded already.
+	 */
+	xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
+			xbufp->tail[0].iov_len;
+
+	task->tk_action = call_bc_transmit;
+	atomic_inc(&task->tk_count);
+	WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
+	rpc_execute(task);
+
+out:
+	dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
+	return task;
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+void
+rpc_call_start(struct rpc_task *task)
+{
+	task->tk_action = call_start;
+}
+EXPORT_SYMBOL_GPL(rpc_call_start);
+
+/**
+ * rpc_peeraddr - extract remote peer address from clnt's xprt
+ * @clnt: RPC client structure
+ * @buf: target buffer
+ * @bufsize: length of target buffer
+ *
+ * Returns the number of bytes that are actually in the stored address.
+ */
+size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
+{
+	size_t bytes;
+	struct rpc_xprt *xprt;
+
+	rcu_read_lock();
+	xprt = rcu_dereference(clnt->cl_xprt);
+
+	bytes = xprt->addrlen;
+	if (bytes > bufsize)
+		bytes = bufsize;
+	memcpy(buf, &xprt->addr, bytes);
+	rcu_read_unlock();
+
+	return bytes;
+}
+EXPORT_SYMBOL_GPL(rpc_peeraddr);
+
+/**
+ * rpc_peeraddr2str - return remote peer address in printable format
+ * @clnt: RPC client structure
+ * @format: address format
+ *
+ * NB: the lifetime of the memory referenced by the returned pointer is
+ * the same as the rpc_xprt itself.  As long as the caller uses this
+ * pointer, it must hold the RCU read lock.
+ */
+const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
+			     enum rpc_display_format_t format)
+{
+	struct rpc_xprt *xprt;
+
+	xprt = rcu_dereference(clnt->cl_xprt);
+
+	if (xprt->address_strings[format] != NULL)
+		return xprt->address_strings[format];
+	else
+		return "unprintable";
+}
+EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
+
+static const struct sockaddr_in rpc_inaddr_loopback = {
+	.sin_family		= AF_INET,
+	.sin_addr.s_addr	= htonl(INADDR_ANY),
+};
+
+static const struct sockaddr_in6 rpc_in6addr_loopback = {
+	.sin6_family		= AF_INET6,
+	.sin6_addr		= IN6ADDR_ANY_INIT,
+};
+
+/*
+ * Try a getsockname() on a connected datagram socket.  Using a
+ * connected datagram socket prevents leaving a socket in TIME_WAIT.
+ * This conserves the ephemeral port number space.
+ *
+ * Returns zero and fills in "buf" if successful; otherwise, a
+ * negative errno is returned.
+ */
+static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
+			struct sockaddr *buf, int buflen)
+{
+	struct socket *sock;
+	int err;
+
+	err = __sock_create(net, sap->sa_family,
+				SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
+	if (err < 0) {
+		dprintk("RPC:       can't create UDP socket (%d)\n", err);
+		goto out;
+	}
+
+	switch (sap->sa_family) {
+	case AF_INET:
+		err = kernel_bind(sock,
+				(struct sockaddr *)&rpc_inaddr_loopback,
+				sizeof(rpc_inaddr_loopback));
+		break;
+	case AF_INET6:
+		err = kernel_bind(sock,
+				(struct sockaddr *)&rpc_in6addr_loopback,
+				sizeof(rpc_in6addr_loopback));
+		break;
+	default:
+		err = -EAFNOSUPPORT;
+		goto out;
+	}
+	if (err < 0) {
+		dprintk("RPC:       can't bind UDP socket (%d)\n", err);
+		goto out_release;
+	}
+
+	err = kernel_connect(sock, sap, salen, 0);
+	if (err < 0) {
+		dprintk("RPC:       can't connect UDP socket (%d)\n", err);
+		goto out_release;
+	}
+
+	err = kernel_getsockname(sock, buf, &buflen);
+	if (err < 0) {
+		dprintk("RPC:       getsockname failed (%d)\n", err);
+		goto out_release;
+	}
+
+	err = 0;
+	if (buf->sa_family == AF_INET6) {
+		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
+		sin6->sin6_scope_id = 0;
+	}
+	dprintk("RPC:       %s succeeded\n", __func__);
+
+out_release:
+	sock_release(sock);
+out:
+	return err;
+}
+
+/*
+ * Scraping a connected socket failed, so we don't have a useable
+ * local address.  Fallback: generate an address that will prevent
+ * the server from calling us back.
+ *
+ * Returns zero and fills in "buf" if successful; otherwise, a
+ * negative errno is returned.
+ */
+static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
+{
+	switch (family) {
+	case AF_INET:
+		if (buflen < sizeof(rpc_inaddr_loopback))
+			return -EINVAL;
+		memcpy(buf, &rpc_inaddr_loopback,
+				sizeof(rpc_inaddr_loopback));
+		break;
+	case AF_INET6:
+		if (buflen < sizeof(rpc_in6addr_loopback))
+			return -EINVAL;
+		memcpy(buf, &rpc_in6addr_loopback,
+				sizeof(rpc_in6addr_loopback));
+	default:
+		dprintk("RPC:       %s: address family not supported\n",
+			__func__);
+		return -EAFNOSUPPORT;
+	}
+	dprintk("RPC:       %s: succeeded\n", __func__);
+	return 0;
+}
+
+/**
+ * rpc_localaddr - discover local endpoint address for an RPC client
+ * @clnt: RPC client structure
+ * @buf: target buffer
+ * @buflen: size of target buffer, in bytes
+ *
+ * Returns zero and fills in "buf" and "buflen" if successful;
+ * otherwise, a negative errno is returned.
+ *
+ * This works even if the underlying transport is not currently connected,
+ * or if the upper layer never previously provided a source address.
+ *
+ * The result of this function call is transient: multiple calls in
+ * succession may give different results, depending on how local
+ * networking configuration changes over time.
+ */
+int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
+{
+	struct sockaddr_storage address;
+	struct sockaddr *sap = (struct sockaddr *)&address;
+	struct rpc_xprt *xprt;
+	struct net *net;
+	size_t salen;
+	int err;
+
+	rcu_read_lock();
+	xprt = rcu_dereference(clnt->cl_xprt);
+	salen = xprt->addrlen;
+	memcpy(sap, &xprt->addr, salen);
+	net = get_net(xprt->xprt_net);
+	rcu_read_unlock();
+
+	rpc_set_port(sap, 0);
+	err = rpc_sockname(net, sap, salen, buf, buflen);
+	put_net(net);
+	if (err != 0)
+		/* Couldn't discover local address, return ANYADDR */
+		return rpc_anyaddr(sap->sa_family, buf, buflen);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rpc_localaddr);
+
+void
+rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
+{
+	struct rpc_xprt *xprt;
+
+	rcu_read_lock();
+	xprt = rcu_dereference(clnt->cl_xprt);
+	if (xprt->ops->set_buffer_size)
+		xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(rpc_setbufsize);
+
+/**
+ * rpc_protocol - Get transport protocol number for an RPC client
+ * @clnt: RPC client to query
+ *
+ */
+int rpc_protocol(struct rpc_clnt *clnt)
+{
+	int protocol;
+
+	rcu_read_lock();
+	protocol = rcu_dereference(clnt->cl_xprt)->prot;
+	rcu_read_unlock();
+	return protocol;
+}
+EXPORT_SYMBOL_GPL(rpc_protocol);
+
+/**
+ * rpc_net_ns - Get the network namespace for this RPC client
+ * @clnt: RPC client to query
+ *
+ */
+struct net *rpc_net_ns(struct rpc_clnt *clnt)
+{
+	struct net *ret;
+
+	rcu_read_lock();
+	ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_net_ns);
+
+/**
+ * rpc_max_payload - Get maximum payload size for a transport, in bytes
+ * @clnt: RPC client to query
+ *
+ * For stream transports, this is one RPC record fragment (see RFC
+ * 1831), as we don't support multi-record requests yet.  For datagram
+ * transports, this is the size of an IP packet minus the IP, UDP, and
+ * RPC header sizes.
+ */
+size_t rpc_max_payload(struct rpc_clnt *clnt)
+{
+	size_t ret;
+
+	rcu_read_lock();
+	ret = rcu_dereference(clnt->cl_xprt)->max_payload;
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_max_payload);
+
+/**
+ * rpc_get_timeout - Get timeout for transport in units of HZ
+ * @clnt: RPC client to query
+ */
+unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
+{
+	unsigned long ret;
+
+	rcu_read_lock();
+	ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
+	rcu_read_unlock();
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_get_timeout);
+
+/**
+ * rpc_force_rebind - force transport to check that remote port is unchanged
+ * @clnt: client to rebind
+ *
+ */
+void rpc_force_rebind(struct rpc_clnt *clnt)
+{
+	if (clnt->cl_autobind) {
+		rcu_read_lock();
+		xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
+		rcu_read_unlock();
+	}
+}
+EXPORT_SYMBOL_GPL(rpc_force_rebind);
+
+/*
+ * Restart an (async) RPC call from the call_prepare state.
+ * Usually called from within the exit handler.
+ */
+int
+rpc_restart_call_prepare(struct rpc_task *task)
+{
+	if (RPC_ASSASSINATED(task))
+		return 0;
+	task->tk_action = call_start;
+	task->tk_status = 0;
+	if (task->tk_ops->rpc_call_prepare != NULL)
+		task->tk_action = rpc_prepare_task;
+	return 1;
+}
+EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
+
+/*
+ * Restart an (async) RPC call. Usually called from within the
+ * exit handler.
+ */
+int
+rpc_restart_call(struct rpc_task *task)
+{
+	if (RPC_ASSASSINATED(task))
+		return 0;
+	task->tk_action = call_start;
+	task->tk_status = 0;
+	return 1;
+}
+EXPORT_SYMBOL_GPL(rpc_restart_call);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+const char
+*rpc_proc_name(const struct rpc_task *task)
+{
+	const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
+
+	if (proc) {
+		if (proc->p_name)
+			return proc->p_name;
+		else
+			return "NULL";
+	} else
+		return "no proc";
+}
+#endif
+
+/*
+ * 0.  Initial state
+ *
+ *     Other FSM states can be visited zero or more times, but
+ *     this state is visited exactly once for each RPC.
+ */
+static void
+call_start(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+
+	dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
+			clnt->cl_program->name, clnt->cl_vers,
+			rpc_proc_name(task),
+			(RPC_IS_ASYNC(task) ? "async" : "sync"));
+
+	/* Increment call count */
+	task->tk_msg.rpc_proc->p_count++;
+	clnt->cl_stats->rpccnt++;
+	task->tk_action = call_reserve;
+}
+
+/*
+ * 1.	Reserve an RPC call slot
+ */
+static void
+call_reserve(struct rpc_task *task)
+{
+	dprint_status(task);
+
+	task->tk_status  = 0;
+	task->tk_action  = call_reserveresult;
+	xprt_reserve(task);
+}
+
+static void call_retry_reserve(struct rpc_task *task);
+
+/*
+ * 1b.	Grok the result of xprt_reserve()
+ */
+static void
+call_reserveresult(struct rpc_task *task)
+{
+	int status = task->tk_status;
+
+	dprint_status(task);
+
+	/*
+	 * After a call to xprt_reserve(), we must have either
+	 * a request slot or else an error status.
+	 */
+	task->tk_status = 0;
+	if (status >= 0) {
+		if (task->tk_rqstp) {
+			task->tk_action = call_refresh;
+			return;
+		}
+
+		printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
+				__func__, status);
+		rpc_exit(task, -EIO);
+		return;
+	}
+
+	/*
+	 * Even though there was an error, we may have acquired
+	 * a request slot somehow.  Make sure not to leak it.
+	 */
+	if (task->tk_rqstp) {
+		printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
+				__func__, status);
+		xprt_release(task);
+	}
+
+	switch (status) {
+	case -ENOMEM:
+		rpc_delay(task, HZ >> 2);
+	case -EAGAIN:	/* woken up; retry */
+		task->tk_action = call_retry_reserve;
+		return;
+	case -EIO:	/* probably a shutdown */
+		break;
+	default:
+		printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
+				__func__, status);
+		break;
+	}
+	rpc_exit(task, status);
+}
+
+/*
+ * 1c.	Retry reserving an RPC call slot
+ */
+static void
+call_retry_reserve(struct rpc_task *task)
+{
+	dprint_status(task);
+
+	task->tk_status  = 0;
+	task->tk_action  = call_reserveresult;
+	xprt_retry_reserve(task);
+}
+
+/*
+ * 2.	Bind and/or refresh the credentials
+ */
+static void
+call_refresh(struct rpc_task *task)
+{
+	dprint_status(task);
+
+	task->tk_action = call_refreshresult;
+	task->tk_status = 0;
+	task->tk_client->cl_stats->rpcauthrefresh++;
+	rpcauth_refreshcred(task);
+}
+
+/*
+ * 2a.	Process the results of a credential refresh
+ */
+static void
+call_refreshresult(struct rpc_task *task)
+{
+	int status = task->tk_status;
+
+	dprint_status(task);
+
+	task->tk_status = 0;
+	task->tk_action = call_refresh;
+	switch (status) {
+	case 0:
+		if (rpcauth_uptodatecred(task)) {
+			task->tk_action = call_allocate;
+			return;
+		}
+		/* Use rate-limiting and a max number of retries if refresh
+		 * had status 0 but failed to update the cred.
+		 */
+	case -ETIMEDOUT:
+		rpc_delay(task, 3*HZ);
+	case -EAGAIN:
+		status = -EACCES;
+	case -EKEYEXPIRED:
+		if (!task->tk_cred_retry)
+			break;
+		task->tk_cred_retry--;
+		dprintk("RPC: %5u %s: retry refresh creds\n",
+				task->tk_pid, __func__);
+		return;
+	}
+	dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
+				task->tk_pid, __func__, status);
+	rpc_exit(task, status);
+}
+
+/*
+ * 2b.	Allocate the buffer. For details, see sched.c:rpc_malloc.
+ *	(Note: buffer memory is freed in xprt_release).
+ */
+static void
+call_allocate(struct rpc_task *task)
+{
+	unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
+
+	dprint_status(task);
+
+	task->tk_status = 0;
+	task->tk_action = call_bind;
+
+	if (req->rq_buffer)
+		return;
+
+	if (proc->p_proc != 0) {
+		BUG_ON(proc->p_arglen == 0);
+		if (proc->p_decode != NULL)
+			BUG_ON(proc->p_replen == 0);
+	}
+
+	/*
+	 * Calculate the size (in quads) of the RPC call
+	 * and reply headers, and convert both values
+	 * to byte sizes.
+	 */
+	req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
+	req->rq_callsize <<= 2;
+	req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
+	req->rq_rcvsize <<= 2;
+
+	req->rq_buffer = xprt->ops->buf_alloc(task,
+					req->rq_callsize + req->rq_rcvsize);
+	if (req->rq_buffer != NULL)
+		return;
+
+	dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
+
+	if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
+		task->tk_action = call_allocate;
+		rpc_delay(task, HZ>>4);
+		return;
+	}
+
+	rpc_exit(task, -ERESTARTSYS);
+}
+
+static inline int
+rpc_task_need_encode(struct rpc_task *task)
+{
+	return task->tk_rqstp->rq_snd_buf.len == 0;
+}
+
+static inline void
+rpc_task_force_reencode(struct rpc_task *task)
+{
+	task->tk_rqstp->rq_snd_buf.len = 0;
+	task->tk_rqstp->rq_bytes_sent = 0;
+}
+
+static inline void
+rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
+{
+	buf->head[0].iov_base = start;
+	buf->head[0].iov_len = len;
+	buf->tail[0].iov_len = 0;
+	buf->page_len = 0;
+	buf->flags = 0;
+	buf->len = 0;
+	buf->buflen = len;
+}
+
+/*
+ * 3.	Encode arguments of an RPC call
+ */
+static void
+rpc_xdr_encode(struct rpc_task *task)
+{
+	struct rpc_rqst	*req = task->tk_rqstp;
+	kxdreproc_t	encode;
+	__be32		*p;
+
+	dprint_status(task);
+
+	rpc_xdr_buf_init(&req->rq_snd_buf,
+			 req->rq_buffer,
+			 req->rq_callsize);
+	rpc_xdr_buf_init(&req->rq_rcv_buf,
+			 (char *)req->rq_buffer + req->rq_callsize,
+			 req->rq_rcvsize);
+
+	p = rpc_encode_header(task);
+	if (p == NULL) {
+		printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
+		rpc_exit(task, -EIO);
+		return;
+	}
+
+	encode = task->tk_msg.rpc_proc->p_encode;
+	if (encode == NULL)
+		return;
+
+	task->tk_status = rpcauth_wrap_req(task, encode, req, p,
+			task->tk_msg.rpc_argp);
+}
+
+/*
+ * 4.	Get the server port number if not yet set
+ */
+static void
+call_bind(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
+
+	dprint_status(task);
+
+	task->tk_action = call_connect;
+	if (!xprt_bound(xprt)) {
+		task->tk_action = call_bind_status;
+		task->tk_timeout = xprt->bind_timeout;
+		xprt->ops->rpcbind(task);
+	}
+}
+
+/*
+ * 4a.	Sort out bind result
+ */
+static void
+call_bind_status(struct rpc_task *task)
+{
+	int status = -EIO;
+
+	if (task->tk_status >= 0) {
+		dprint_status(task);
+		task->tk_status = 0;
+		task->tk_action = call_connect;
+		return;
+	}
+
+	trace_rpc_bind_status(task);
+	switch (task->tk_status) {
+	case -ENOMEM:
+		dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
+		rpc_delay(task, HZ >> 2);
+		goto retry_timeout;
+	case -EACCES:
+		dprintk("RPC: %5u remote rpcbind: RPC program/version "
+				"unavailable\n", task->tk_pid);
+		/* fail immediately if this is an RPC ping */
+		if (task->tk_msg.rpc_proc->p_proc == 0) {
+			status = -EOPNOTSUPP;
+			break;
+		}
+		if (task->tk_rebind_retry == 0)
+			break;
+		task->tk_rebind_retry--;
+		rpc_delay(task, 3*HZ);
+		goto retry_timeout;
+	case -ETIMEDOUT:
+		dprintk("RPC: %5u rpcbind request timed out\n",
+				task->tk_pid);
+		goto retry_timeout;
+	case -EPFNOSUPPORT:
+		/* server doesn't support any rpcbind version we know of */
+		dprintk("RPC: %5u unrecognized remote rpcbind service\n",
+				task->tk_pid);
+		break;
+	case -EPROTONOSUPPORT:
+		dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
+				task->tk_pid);
+		goto retry_timeout;
+	case -ECONNREFUSED:		/* connection problems */
+	case -ECONNRESET:
+	case -ECONNABORTED:
+	case -ENOTCONN:
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+	case -ENOBUFS:
+	case -EPIPE:
+		dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
+				task->tk_pid, task->tk_status);
+		if (!RPC_IS_SOFTCONN(task)) {
+			rpc_delay(task, 5*HZ);
+			goto retry_timeout;
+		}
+		status = task->tk_status;
+		break;
+	default:
+		dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
+				task->tk_pid, -task->tk_status);
+	}
+
+	rpc_exit(task, status);
+	return;
+
+retry_timeout:
+	task->tk_status = 0;
+	task->tk_action = call_timeout;
+}
+
+/*
+ * 4b.	Connect to the RPC server
+ */
+static void
+call_connect(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
+
+	dprintk("RPC: %5u call_connect xprt %p %s connected\n",
+			task->tk_pid, xprt,
+			(xprt_connected(xprt) ? "is" : "is not"));
+
+	task->tk_action = call_transmit;
+	if (!xprt_connected(xprt)) {
+		task->tk_action = call_connect_status;
+		if (task->tk_status < 0)
+			return;
+		if (task->tk_flags & RPC_TASK_NOCONNECT) {
+			rpc_exit(task, -ENOTCONN);
+			return;
+		}
+		xprt_connect(task);
+	}
+}
+
+/*
+ * 4c.	Sort out connect result
+ */
+static void
+call_connect_status(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+	int status = task->tk_status;
+
+	dprint_status(task);
+
+	trace_rpc_connect_status(task, status);
+	task->tk_status = 0;
+	switch (status) {
+	case -ECONNREFUSED:
+	case -ECONNRESET:
+	case -ECONNABORTED:
+	case -ENETUNREACH:
+	case -EHOSTUNREACH:
+	case -EADDRINUSE:
+	case -ENOBUFS:
+	case -EPIPE:
+		if (RPC_IS_SOFTCONN(task))
+			break;
+		/* retry with existing socket, after a delay */
+		rpc_delay(task, 3*HZ);
+	case -EAGAIN:
+		/* Check for timeouts before looping back to call_bind */
+	case -ETIMEDOUT:
+		task->tk_action = call_timeout;
+		return;
+	case 0:
+		clnt->cl_stats->netreconn++;
+		task->tk_action = call_transmit;
+		return;
+	}
+	rpc_exit(task, status);
+}
+
+/*
+ * 5.	Transmit the RPC request, and wait for reply
+ */
+static void
+call_transmit(struct rpc_task *task)
+{
+	int is_retrans = RPC_WAS_SENT(task);
+
+	dprint_status(task);
+
+	task->tk_action = call_status;
+	if (task->tk_status < 0)
+		return;
+	if (!xprt_prepare_transmit(task))
+		return;
+	task->tk_action = call_transmit_status;
+	/* Encode here so that rpcsec_gss can use correct sequence number. */
+	if (rpc_task_need_encode(task)) {
+		rpc_xdr_encode(task);
+		/* Did the encode result in an error condition? */
+		if (task->tk_status != 0) {
+			/* Was the error nonfatal? */
+			if (task->tk_status == -EAGAIN)
+				rpc_delay(task, HZ >> 4);
+			else
+				rpc_exit(task, task->tk_status);
+			return;
+		}
+	}
+	xprt_transmit(task);
+	if (task->tk_status < 0)
+		return;
+	if (is_retrans)
+		task->tk_client->cl_stats->rpcretrans++;
+	/*
+	 * On success, ensure that we call xprt_end_transmit() before sleeping
+	 * in order to allow access to the socket to other RPC requests.
+	 */
+	call_transmit_status(task);
+	if (rpc_reply_expected(task))
+		return;
+	task->tk_action = rpc_exit_task;
+	rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
+}
+
+/*
+ * 5a.	Handle cleanup after a transmission
+ */
+static void
+call_transmit_status(struct rpc_task *task)
+{
+	task->tk_action = call_status;
+
+	/*
+	 * Common case: success.  Force the compiler to put this
+	 * test first.
+	 */
+	if (task->tk_status == 0) {
+		xprt_end_transmit(task);
+		rpc_task_force_reencode(task);
+		return;
+	}
+
+	switch (task->tk_status) {
+	case -EAGAIN:
+		break;
+	default:
+		dprint_status(task);
+		xprt_end_transmit(task);
+		rpc_task_force_reencode(task);
+		break;
+		/*
+		 * Special cases: if we've been waiting on the
+		 * socket's write_space() callback, or if the
+		 * socket just returned a connection error,
+		 * then hold onto the transport lock.
+		 */
+	case -ECONNREFUSED:
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+	case -EPERM:
+		if (RPC_IS_SOFTCONN(task)) {
+			xprt_end_transmit(task);
+			rpc_exit(task, task->tk_status);
+			break;
+		}
+	case -ECONNRESET:
+	case -ECONNABORTED:
+	case -EADDRINUSE:
+	case -ENOTCONN:
+	case -ENOBUFS:
+	case -EPIPE:
+		rpc_task_force_reencode(task);
+	}
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * 5b.	Send the backchannel RPC reply.  On error, drop the reply.  In
+ * addition, disconnect on connectivity errors.
+ */
+static void
+call_bc_transmit(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+
+	if (!xprt_prepare_transmit(task)) {
+		/*
+		 * Could not reserve the transport. Try again after the
+		 * transport is released.
+		 */
+		task->tk_status = 0;
+		task->tk_action = call_bc_transmit;
+		return;
+	}
+
+	task->tk_action = rpc_exit_task;
+	if (task->tk_status < 0) {
+		printk(KERN_NOTICE "RPC: Could not send backchannel reply "
+			"error: %d\n", task->tk_status);
+		return;
+	}
+
+	xprt_transmit(task);
+	xprt_end_transmit(task);
+	dprint_status(task);
+	switch (task->tk_status) {
+	case 0:
+		/* Success */
+		break;
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+	case -ETIMEDOUT:
+		/*
+		 * Problem reaching the server.  Disconnect and let the
+		 * forechannel reestablish the connection.  The server will
+		 * have to retransmit the backchannel request and we'll
+		 * reprocess it.  Since these ops are idempotent, there's no
+		 * need to cache our reply at this time.
+		 */
+		printk(KERN_NOTICE "RPC: Could not send backchannel reply "
+			"error: %d\n", task->tk_status);
+		xprt_conditional_disconnect(req->rq_xprt,
+			req->rq_connect_cookie);
+		break;
+	default:
+		/*
+		 * We were unable to reply and will have to drop the
+		 * request.  The server should reconnect and retransmit.
+		 */
+		WARN_ON_ONCE(task->tk_status == -EAGAIN);
+		printk(KERN_NOTICE "RPC: Could not send backchannel reply "
+			"error: %d\n", task->tk_status);
+		break;
+	}
+	rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+/*
+ * 6.	Sort out the RPC call status
+ */
+static void
+call_status(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct rpc_rqst	*req = task->tk_rqstp;
+	int		status;
+
+	if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
+		task->tk_status = req->rq_reply_bytes_recvd;
+
+	dprint_status(task);
+
+	status = task->tk_status;
+	if (status >= 0) {
+		task->tk_action = call_decode;
+		return;
+	}
+
+	trace_rpc_call_status(task);
+	task->tk_status = 0;
+	switch(status) {
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+	case -EPERM:
+		if (RPC_IS_SOFTCONN(task)) {
+			rpc_exit(task, status);
+			break;
+		}
+		/*
+		 * Delay any retries for 3 seconds, then handle as if it
+		 * were a timeout.
+		 */
+		rpc_delay(task, 3*HZ);
+	case -ETIMEDOUT:
+		task->tk_action = call_timeout;
+		if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT)
+		    && task->tk_client->cl_discrtry)
+			xprt_conditional_disconnect(req->rq_xprt,
+					req->rq_connect_cookie);
+		break;
+	case -ECONNREFUSED:
+	case -ECONNRESET:
+	case -ECONNABORTED:
+		rpc_force_rebind(clnt);
+	case -EADDRINUSE:
+	case -ENOBUFS:
+		rpc_delay(task, 3*HZ);
+	case -EPIPE:
+	case -ENOTCONN:
+		task->tk_action = call_bind;
+		break;
+	case -EAGAIN:
+		task->tk_action = call_transmit;
+		break;
+	case -EIO:
+		/* shutdown or soft timeout */
+		rpc_exit(task, status);
+		break;
+	default:
+		if (clnt->cl_chatty)
+			printk("%s: RPC call returned error %d\n",
+			       clnt->cl_program->name, -status);
+		rpc_exit(task, status);
+	}
+}
+
+/*
+ * 6a.	Handle RPC timeout
+ * 	We do not release the request slot, so we keep using the
+ *	same XID for all retransmits.
+ */
+static void
+call_timeout(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+
+	if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
+		dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
+		goto retry;
+	}
+
+	dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
+	task->tk_timeouts++;
+
+	if (RPC_IS_SOFTCONN(task)) {
+		rpc_exit(task, -ETIMEDOUT);
+		return;
+	}
+	if (RPC_IS_SOFT(task)) {
+		if (clnt->cl_chatty) {
+			rcu_read_lock();
+			printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
+				clnt->cl_program->name,
+				rcu_dereference(clnt->cl_xprt)->servername);
+			rcu_read_unlock();
+		}
+		if (task->tk_flags & RPC_TASK_TIMEOUT)
+			rpc_exit(task, -ETIMEDOUT);
+		else
+			rpc_exit(task, -EIO);
+		return;
+	}
+
+	if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
+		task->tk_flags |= RPC_CALL_MAJORSEEN;
+		if (clnt->cl_chatty) {
+			rcu_read_lock();
+			printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
+			clnt->cl_program->name,
+			rcu_dereference(clnt->cl_xprt)->servername);
+			rcu_read_unlock();
+		}
+	}
+	rpc_force_rebind(clnt);
+	/*
+	 * Did our request time out due to an RPCSEC_GSS out-of-sequence
+	 * event? RFC2203 requires the server to drop all such requests.
+	 */
+	rpcauth_invalcred(task);
+
+retry:
+	task->tk_action = call_bind;
+	task->tk_status = 0;
+}
+
+/*
+ * 7.	Decode the RPC reply
+ */
+static void
+call_decode(struct rpc_task *task)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct rpc_rqst	*req = task->tk_rqstp;
+	kxdrdproc_t	decode = task->tk_msg.rpc_proc->p_decode;
+	__be32		*p;
+
+	dprint_status(task);
+
+	if (task->tk_flags & RPC_CALL_MAJORSEEN) {
+		if (clnt->cl_chatty) {
+			rcu_read_lock();
+			printk(KERN_NOTICE "%s: server %s OK\n",
+				clnt->cl_program->name,
+				rcu_dereference(clnt->cl_xprt)->servername);
+			rcu_read_unlock();
+		}
+		task->tk_flags &= ~RPC_CALL_MAJORSEEN;
+	}
+
+	/*
+	 * Ensure that we see all writes made by xprt_complete_rqst()
+	 * before it changed req->rq_reply_bytes_recvd.
+	 */
+	smp_rmb();
+	req->rq_rcv_buf.len = req->rq_private_buf.len;
+
+	/* Check that the softirq receive buffer is valid */
+	WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
+				sizeof(req->rq_rcv_buf)) != 0);
+
+	if (req->rq_rcv_buf.len < 12) {
+		if (!RPC_IS_SOFT(task)) {
+			task->tk_action = call_bind;
+			goto out_retry;
+		}
+		dprintk("RPC:       %s: too small RPC reply size (%d bytes)\n",
+				clnt->cl_program->name, task->tk_status);
+		task->tk_action = call_timeout;
+		goto out_retry;
+	}
+
+	p = rpc_verify_header(task);
+	if (IS_ERR(p)) {
+		if (p == ERR_PTR(-EAGAIN))
+			goto out_retry;
+		return;
+	}
+
+	task->tk_action = rpc_exit_task;
+
+	if (decode) {
+		task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
+						      task->tk_msg.rpc_resp);
+	}
+	dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
+			task->tk_status);
+	return;
+out_retry:
+	task->tk_status = 0;
+	/* Note: rpc_verify_header() may have freed the RPC slot */
+	if (task->tk_rqstp == req) {
+		req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
+		if (task->tk_client->cl_discrtry)
+			xprt_conditional_disconnect(req->rq_xprt,
+					req->rq_connect_cookie);
+	}
+}
+
+static __be32 *
+rpc_encode_header(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+	struct rpc_rqst	*req = task->tk_rqstp;
+	__be32		*p = req->rq_svec[0].iov_base;
+
+	/* FIXME: check buffer size? */
+
+	p = xprt_skip_transport_header(req->rq_xprt, p);
+	*p++ = req->rq_xid;		/* XID */
+	*p++ = htonl(RPC_CALL);		/* CALL */
+	*p++ = htonl(RPC_VERSION);	/* RPC version */
+	*p++ = htonl(clnt->cl_prog);	/* program number */
+	*p++ = htonl(clnt->cl_vers);	/* program version */
+	*p++ = htonl(task->tk_msg.rpc_proc->p_proc);	/* procedure */
+	p = rpcauth_marshcred(task, p);
+	req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
+	return p;
+}
+
+static __be32 *
+rpc_verify_header(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt = task->tk_client;
+	struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
+	int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
+	__be32	*p = iov->iov_base;
+	u32 n;
+	int error = -EACCES;
+
+	if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
+		/* RFC-1014 says that the representation of XDR data must be a
+		 * multiple of four bytes
+		 * - if it isn't pointer subtraction in the NFS client may give
+		 *   undefined results
+		 */
+		dprintk("RPC: %5u %s: XDR representation not a multiple of"
+		       " 4 bytes: 0x%x\n", task->tk_pid, __func__,
+		       task->tk_rqstp->rq_rcv_buf.len);
+		error = -EIO;
+		goto out_err;
+	}
+	if ((len -= 3) < 0)
+		goto out_overflow;
+
+	p += 1; /* skip XID */
+	if ((n = ntohl(*p++)) != RPC_REPLY) {
+		dprintk("RPC: %5u %s: not an RPC reply: %x\n",
+			task->tk_pid, __func__, n);
+		error = -EIO;
+		goto out_garbage;
+	}
+
+	if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
+		if (--len < 0)
+			goto out_overflow;
+		switch ((n = ntohl(*p++))) {
+		case RPC_AUTH_ERROR:
+			break;
+		case RPC_MISMATCH:
+			dprintk("RPC: %5u %s: RPC call version mismatch!\n",
+				task->tk_pid, __func__);
+			error = -EPROTONOSUPPORT;
+			goto out_err;
+		default:
+			dprintk("RPC: %5u %s: RPC call rejected, "
+				"unknown error: %x\n",
+				task->tk_pid, __func__, n);
+			error = -EIO;
+			goto out_err;
+		}
+		if (--len < 0)
+			goto out_overflow;
+		switch ((n = ntohl(*p++))) {
+		case RPC_AUTH_REJECTEDCRED:
+		case RPC_AUTH_REJECTEDVERF:
+		case RPCSEC_GSS_CREDPROBLEM:
+		case RPCSEC_GSS_CTXPROBLEM:
+			if (!task->tk_cred_retry)
+				break;
+			task->tk_cred_retry--;
+			dprintk("RPC: %5u %s: retry stale creds\n",
+					task->tk_pid, __func__);
+			rpcauth_invalcred(task);
+			/* Ensure we obtain a new XID! */
+			xprt_release(task);
+			task->tk_action = call_reserve;
+			goto out_retry;
+		case RPC_AUTH_BADCRED:
+		case RPC_AUTH_BADVERF:
+			/* possibly garbled cred/verf? */
+			if (!task->tk_garb_retry)
+				break;
+			task->tk_garb_retry--;
+			dprintk("RPC: %5u %s: retry garbled creds\n",
+					task->tk_pid, __func__);
+			task->tk_action = call_bind;
+			goto out_retry;
+		case RPC_AUTH_TOOWEAK:
+			rcu_read_lock();
+			printk(KERN_NOTICE "RPC: server %s requires stronger "
+			       "authentication.\n",
+			       rcu_dereference(clnt->cl_xprt)->servername);
+			rcu_read_unlock();
+			break;
+		default:
+			dprintk("RPC: %5u %s: unknown auth error: %x\n",
+					task->tk_pid, __func__, n);
+			error = -EIO;
+		}
+		dprintk("RPC: %5u %s: call rejected %d\n",
+				task->tk_pid, __func__, n);
+		goto out_err;
+	}
+	p = rpcauth_checkverf(task, p);
+	if (IS_ERR(p)) {
+		error = PTR_ERR(p);
+		dprintk("RPC: %5u %s: auth check failed with %d\n",
+				task->tk_pid, __func__, error);
+		goto out_garbage;		/* bad verifier, retry */
+	}
+	len = p - (__be32 *)iov->iov_base - 1;
+	if (len < 0)
+		goto out_overflow;
+	switch ((n = ntohl(*p++))) {
+	case RPC_SUCCESS:
+		return p;
+	case RPC_PROG_UNAVAIL:
+		dprintk_rcu("RPC: %5u %s: program %u is unsupported "
+				"by server %s\n", task->tk_pid, __func__,
+				(unsigned int)clnt->cl_prog,
+				rcu_dereference(clnt->cl_xprt)->servername);
+		error = -EPFNOSUPPORT;
+		goto out_err;
+	case RPC_PROG_MISMATCH:
+		dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
+				"by server %s\n", task->tk_pid, __func__,
+				(unsigned int)clnt->cl_prog,
+				(unsigned int)clnt->cl_vers,
+				rcu_dereference(clnt->cl_xprt)->servername);
+		error = -EPROTONOSUPPORT;
+		goto out_err;
+	case RPC_PROC_UNAVAIL:
+		dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
+				"version %u on server %s\n",
+				task->tk_pid, __func__,
+				rpc_proc_name(task),
+				clnt->cl_prog, clnt->cl_vers,
+				rcu_dereference(clnt->cl_xprt)->servername);
+		error = -EOPNOTSUPP;
+		goto out_err;
+	case RPC_GARBAGE_ARGS:
+		dprintk("RPC: %5u %s: server saw garbage\n",
+				task->tk_pid, __func__);
+		break;			/* retry */
+	default:
+		dprintk("RPC: %5u %s: server accept status: %x\n",
+				task->tk_pid, __func__, n);
+		/* Also retry */
+	}
+
+out_garbage:
+	clnt->cl_stats->rpcgarbage++;
+	if (task->tk_garb_retry) {
+		task->tk_garb_retry--;
+		dprintk("RPC: %5u %s: retrying\n",
+				task->tk_pid, __func__);
+		task->tk_action = call_bind;
+out_retry:
+		return ERR_PTR(-EAGAIN);
+	}
+out_err:
+	rpc_exit(task, error);
+	dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
+			__func__, error);
+	return ERR_PTR(error);
+out_overflow:
+	dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
+			__func__);
+	goto out_garbage;
+}
+
+static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
+{
+}
+
+static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
+{
+	return 0;
+}
+
+static struct rpc_procinfo rpcproc_null = {
+	.p_encode = rpcproc_encode_null,
+	.p_decode = rpcproc_decode_null,
+};
+
+static int rpc_ping(struct rpc_clnt *clnt)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &rpcproc_null,
+	};
+	int err;
+	msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
+	err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
+	put_rpccred(msg.rpc_cred);
+	return err;
+}
+
+struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &rpcproc_null,
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = &msg,
+		.callback_ops = &rpc_default_ops,
+		.flags = flags,
+	};
+	return rpc_run_task(&task_setup_data);
+}
+EXPORT_SYMBOL_GPL(rpc_call_null);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+static void rpc_show_header(void)
+{
+	printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
+		"-timeout ---ops--\n");
+}
+
+static void rpc_show_task(const struct rpc_clnt *clnt,
+			  const struct rpc_task *task)
+{
+	const char *rpc_waitq = "none";
+
+	if (RPC_IS_QUEUED(task))
+		rpc_waitq = rpc_qname(task->tk_waitqueue);
+
+	printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
+		task->tk_pid, task->tk_flags, task->tk_status,
+		clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
+		clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
+		task->tk_action, rpc_waitq);
+}
+
+void rpc_show_tasks(struct net *net)
+{
+	struct rpc_clnt *clnt;
+	struct rpc_task *task;
+	int header = 0;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	spin_lock(&sn->rpc_client_lock);
+	list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+		spin_lock(&clnt->cl_lock);
+		list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
+			if (!header) {
+				rpc_show_header();
+				header++;
+			}
+			rpc_show_task(clnt, task);
+		}
+		spin_unlock(&clnt->cl_lock);
+	}
+	spin_unlock(&sn->rpc_client_lock);
+}
+#endif
diff --git a/kernel/net/sunrpc/debugfs.c b/kernel/net/sunrpc/debugfs.c
new file mode 100644
index 000000000..82962f7e6
--- /dev/null
+++ b/kernel/net/sunrpc/debugfs.c
@@ -0,0 +1,298 @@
+/**
+ * debugfs interface for sunrpc
+ *
+ * (c) 2014 Jeff Layton <jlayton@primarydata.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include "netns.h"
+
+static struct dentry *topdir;
+static struct dentry *rpc_clnt_dir;
+static struct dentry *rpc_xprt_dir;
+
+struct rpc_clnt_iter {
+	struct rpc_clnt	*clnt;
+	loff_t		pos;
+};
+
+static int
+tasks_show(struct seq_file *f, void *v)
+{
+	u32 xid = 0;
+	struct rpc_task *task = v;
+	struct rpc_clnt *clnt = task->tk_client;
+	const char *rpc_waitq = "none";
+
+	if (RPC_IS_QUEUED(task))
+		rpc_waitq = rpc_qname(task->tk_waitqueue);
+
+	if (task->tk_rqstp)
+		xid = be32_to_cpu(task->tk_rqstp->rq_xid);
+
+	seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n",
+		task->tk_pid, task->tk_flags, task->tk_status,
+		clnt->cl_clid, xid, task->tk_timeout, task->tk_ops,
+		clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
+		task->tk_action, rpc_waitq);
+	return 0;
+}
+
+static void *
+tasks_start(struct seq_file *f, loff_t *ppos)
+	__acquires(&clnt->cl_lock)
+{
+	struct rpc_clnt_iter *iter = f->private;
+	loff_t pos = *ppos;
+	struct rpc_clnt *clnt = iter->clnt;
+	struct rpc_task *task;
+
+	iter->pos = pos + 1;
+	spin_lock(&clnt->cl_lock);
+	list_for_each_entry(task, &clnt->cl_tasks, tk_task)
+		if (pos-- == 0)
+			return task;
+	return NULL;
+}
+
+static void *
+tasks_next(struct seq_file *f, void *v, loff_t *pos)
+{
+	struct rpc_clnt_iter *iter = f->private;
+	struct rpc_clnt *clnt = iter->clnt;
+	struct rpc_task *task = v;
+	struct list_head *next = task->tk_task.next;
+
+	++iter->pos;
+	++*pos;
+
+	/* If there's another task on list, return it */
+	if (next == &clnt->cl_tasks)
+		return NULL;
+	return list_entry(next, struct rpc_task, tk_task);
+}
+
+static void
+tasks_stop(struct seq_file *f, void *v)
+	__releases(&clnt->cl_lock)
+{
+	struct rpc_clnt_iter *iter = f->private;
+	struct rpc_clnt *clnt = iter->clnt;
+
+	spin_unlock(&clnt->cl_lock);
+}
+
+static const struct seq_operations tasks_seq_operations = {
+	.start	= tasks_start,
+	.next	= tasks_next,
+	.stop	= tasks_stop,
+	.show	= tasks_show,
+};
+
+static int tasks_open(struct inode *inode, struct file *filp)
+{
+	int ret = seq_open_private(filp, &tasks_seq_operations,
+					sizeof(struct rpc_clnt_iter));
+
+	if (!ret) {
+		struct seq_file *seq = filp->private_data;
+		struct rpc_clnt_iter *iter = seq->private;
+
+		iter->clnt = inode->i_private;
+
+		if (!atomic_inc_not_zero(&iter->clnt->cl_count)) {
+			seq_release_private(inode, filp);
+			ret = -EINVAL;
+		}
+	}
+
+	return ret;
+}
+
+static int
+tasks_release(struct inode *inode, struct file *filp)
+{
+	struct seq_file *seq = filp->private_data;
+	struct rpc_clnt_iter *iter = seq->private;
+
+	rpc_release_client(iter->clnt);
+	return seq_release_private(inode, filp);
+}
+
+static const struct file_operations tasks_fops = {
+	.owner		= THIS_MODULE,
+	.open		= tasks_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= tasks_release,
+};
+
+void
+rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
+{
+	int len;
+	char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
+	struct rpc_xprt *xprt;
+
+	/* Already registered? */
+	if (clnt->cl_debugfs || !rpc_clnt_dir)
+		return;
+
+	len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
+	if (len >= sizeof(name))
+		return;
+
+	/* make the per-client dir */
+	clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
+	if (!clnt->cl_debugfs)
+		return;
+
+	/* make tasks file */
+	if (!debugfs_create_file("tasks", S_IFREG | S_IRUSR, clnt->cl_debugfs,
+				 clnt, &tasks_fops))
+		goto out_err;
+
+	rcu_read_lock();
+	xprt = rcu_dereference(clnt->cl_xprt);
+	/* no "debugfs" dentry? Don't bother with the symlink. */
+	if (!xprt->debugfs) {
+		rcu_read_unlock();
+		return;
+	}
+	len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
+			xprt->debugfs->d_name.name);
+	rcu_read_unlock();
+
+	if (len >= sizeof(name))
+		goto out_err;
+
+	if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
+		goto out_err;
+
+	return;
+out_err:
+	debugfs_remove_recursive(clnt->cl_debugfs);
+	clnt->cl_debugfs = NULL;
+}
+
+void
+rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
+{
+	debugfs_remove_recursive(clnt->cl_debugfs);
+	clnt->cl_debugfs = NULL;
+}
+
+static int
+xprt_info_show(struct seq_file *f, void *v)
+{
+	struct rpc_xprt *xprt = f->private;
+
+	seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]);
+	seq_printf(f, "addr:  %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
+	seq_printf(f, "port:  %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
+	seq_printf(f, "state: 0x%lx\n", xprt->state);
+	return 0;
+}
+
+static int
+xprt_info_open(struct inode *inode, struct file *filp)
+{
+	int ret;
+	struct rpc_xprt *xprt = inode->i_private;
+
+	ret = single_open(filp, xprt_info_show, xprt);
+
+	if (!ret) {
+		if (!xprt_get(xprt)) {
+			single_release(inode, filp);
+			ret = -EINVAL;
+		}
+	}
+	return ret;
+}
+
+static int
+xprt_info_release(struct inode *inode, struct file *filp)
+{
+	struct rpc_xprt *xprt = inode->i_private;
+
+	xprt_put(xprt);
+	return single_release(inode, filp);
+}
+
+static const struct file_operations xprt_info_fops = {
+	.owner		= THIS_MODULE,
+	.open		= xprt_info_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= xprt_info_release,
+};
+
+void
+rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
+{
+	int len, id;
+	static atomic_t	cur_id;
+	char		name[9]; /* 8 hex digits + NULL term */
+
+	if (!rpc_xprt_dir)
+		return;
+
+	id = (unsigned int)atomic_inc_return(&cur_id);
+
+	len = snprintf(name, sizeof(name), "%x", id);
+	if (len >= sizeof(name))
+		return;
+
+	/* make the per-client dir */
+	xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
+	if (!xprt->debugfs)
+		return;
+
+	/* make tasks file */
+	if (!debugfs_create_file("info", S_IFREG | S_IRUSR, xprt->debugfs,
+				 xprt, &xprt_info_fops)) {
+		debugfs_remove_recursive(xprt->debugfs);
+		xprt->debugfs = NULL;
+	}
+}
+
+void
+rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
+{
+	debugfs_remove_recursive(xprt->debugfs);
+	xprt->debugfs = NULL;
+}
+
+void __exit
+sunrpc_debugfs_exit(void)
+{
+	debugfs_remove_recursive(topdir);
+	topdir = NULL;
+	rpc_clnt_dir = NULL;
+	rpc_xprt_dir = NULL;
+}
+
+void __init
+sunrpc_debugfs_init(void)
+{
+	topdir = debugfs_create_dir("sunrpc", NULL);
+	if (!topdir)
+		return;
+
+	rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
+	if (!rpc_clnt_dir)
+		goto out_remove;
+
+	rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
+	if (!rpc_xprt_dir)
+		goto out_remove;
+
+	return;
+out_remove:
+	debugfs_remove_recursive(topdir);
+	topdir = NULL;
+	rpc_clnt_dir = NULL;
+}
diff --git a/kernel/net/sunrpc/netns.h b/kernel/net/sunrpc/netns.h
new file mode 100644
index 000000000..df5826876
--- /dev/null
+++ b/kernel/net/sunrpc/netns.h
@@ -0,0 +1,42 @@
+#ifndef __SUNRPC_NETNS_H__
+#define __SUNRPC_NETNS_H__
+
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+struct cache_detail;
+
+struct sunrpc_net {
+	struct proc_dir_entry *proc_net_rpc;
+	struct cache_detail *ip_map_cache;
+	struct cache_detail *unix_gid_cache;
+	struct cache_detail *rsc_cache;
+	struct cache_detail *rsi_cache;
+
+	struct super_block *pipefs_sb;
+	struct rpc_pipe *gssd_dummy;
+	struct mutex pipefs_sb_lock;
+
+	struct list_head all_clients;
+	spinlock_t rpc_client_lock;
+
+	struct rpc_clnt *rpcb_local_clnt;
+	struct rpc_clnt *rpcb_local_clnt4;
+	spinlock_t rpcb_clnt_lock;
+	unsigned int rpcb_users;
+	unsigned int rpcb_is_af_local : 1;
+
+	struct mutex gssp_lock;
+	struct rpc_clnt *gssp_clnt;
+	int use_gss_proxy;
+	int pipe_version;
+	atomic_t pipe_users;
+	struct proc_dir_entry *use_gssp_proc;
+};
+
+extern int sunrpc_net_id;
+
+int ip_map_cache_create(struct net *);
+void ip_map_cache_destroy(struct net *);
+
+#endif
diff --git a/kernel/net/sunrpc/rpc_pipe.c b/kernel/net/sunrpc/rpc_pipe.c
new file mode 100644
index 000000000..d81186d34
--- /dev/null
+++ b/kernel/net/sunrpc/rpc_pipe.c
@@ -0,0 +1,1527 @@
+/*
+ * net/sunrpc/rpc_pipe.c
+ *
+ * Userland/kernel interface for rpcauth_gss.
+ * Code shamelessly plagiarized from fs/nfsd/nfsctl.c
+ * and fs/sysfs/inode.c
+ *
+ * Copyright (c) 2002, Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ */
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/pagemap.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/fsnotify.h>
+#include <linux/kernel.h>
+#include <linux/rcupdate.h>
+#include <linux/utsname.h>
+
+#include <asm/ioctls.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <linux/seq_file.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/cache.h>
+#include <linux/nsproxy.h>
+#include <linux/notifier.h>
+
+#include "netns.h"
+#include "sunrpc.h"
+
+#define RPCDBG_FACILITY RPCDBG_DEBUG
+
+#define NET_NAME(net)	((net == &init_net) ? " (init_net)" : "")
+
+static struct file_system_type rpc_pipe_fs_type;
+static const struct rpc_pipe_ops gssd_dummy_pipe_ops;
+
+static struct kmem_cache *rpc_inode_cachep __read_mostly;
+
+#define RPC_UPCALL_TIMEOUT (30*HZ)
+
+static BLOCKING_NOTIFIER_HEAD(rpc_pipefs_notifier_list);
+
+int rpc_pipefs_notifier_register(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
+
+void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&rpc_pipefs_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
+
+static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
+		void (*destroy_msg)(struct rpc_pipe_msg *), int err)
+{
+	struct rpc_pipe_msg *msg;
+
+	if (list_empty(head))
+		return;
+	do {
+		msg = list_entry(head->next, struct rpc_pipe_msg, list);
+		list_del_init(&msg->list);
+		msg->errno = err;
+		destroy_msg(msg);
+	} while (!list_empty(head));
+
+	if (waitq)
+		wake_up(waitq);
+}
+
+static void
+rpc_timeout_upcall_queue(struct work_struct *work)
+{
+	LIST_HEAD(free_list);
+	struct rpc_pipe *pipe =
+		container_of(work, struct rpc_pipe, queue_timeout.work);
+	void (*destroy_msg)(struct rpc_pipe_msg *);
+	struct dentry *dentry;
+
+	spin_lock(&pipe->lock);
+	destroy_msg = pipe->ops->destroy_msg;
+	if (pipe->nreaders == 0) {
+		list_splice_init(&pipe->pipe, &free_list);
+		pipe->pipelen = 0;
+	}
+	dentry = dget(pipe->dentry);
+	spin_unlock(&pipe->lock);
+	rpc_purge_list(dentry ? &RPC_I(d_inode(dentry))->waitq : NULL,
+			&free_list, destroy_msg, -ETIMEDOUT);
+	dput(dentry);
+}
+
+ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
+				char __user *dst, size_t buflen)
+{
+	char *data = (char *)msg->data + msg->copied;
+	size_t mlen = min(msg->len - msg->copied, buflen);
+	unsigned long left;
+
+	left = copy_to_user(dst, data, mlen);
+	if (left == mlen) {
+		msg->errno = -EFAULT;
+		return -EFAULT;
+	}
+
+	mlen -= left;
+	msg->copied += mlen;
+	msg->errno = 0;
+	return mlen;
+}
+EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
+
+/**
+ * rpc_queue_upcall - queue an upcall message to userspace
+ * @pipe: upcall pipe on which to queue given message
+ * @msg: message to queue
+ *
+ * Call with an @inode created by rpc_mkpipe() to queue an upcall.
+ * A userspace process may then later read the upcall by performing a
+ * read on an open file for this inode.  It is up to the caller to
+ * initialize the fields of @msg (other than @msg->list) appropriately.
+ */
+int
+rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
+{
+	int res = -EPIPE;
+	struct dentry *dentry;
+
+	spin_lock(&pipe->lock);
+	if (pipe->nreaders) {
+		list_add_tail(&msg->list, &pipe->pipe);
+		pipe->pipelen += msg->len;
+		res = 0;
+	} else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {
+		if (list_empty(&pipe->pipe))
+			queue_delayed_work(rpciod_workqueue,
+					&pipe->queue_timeout,
+					RPC_UPCALL_TIMEOUT);
+		list_add_tail(&msg->list, &pipe->pipe);
+		pipe->pipelen += msg->len;
+		res = 0;
+	}
+	dentry = dget(pipe->dentry);
+	spin_unlock(&pipe->lock);
+	if (dentry) {
+		wake_up(&RPC_I(d_inode(dentry))->waitq);
+		dput(dentry);
+	}
+	return res;
+}
+EXPORT_SYMBOL_GPL(rpc_queue_upcall);
+
+static inline void
+rpc_inode_setowner(struct inode *inode, void *private)
+{
+	RPC_I(inode)->private = private;
+}
+
+static void
+rpc_close_pipes(struct inode *inode)
+{
+	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
+	int need_release;
+	LIST_HEAD(free_list);
+
+	mutex_lock(&inode->i_mutex);
+	spin_lock(&pipe->lock);
+	need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
+	pipe->nreaders = 0;
+	list_splice_init(&pipe->in_upcall, &free_list);
+	list_splice_init(&pipe->pipe, &free_list);
+	pipe->pipelen = 0;
+	pipe->dentry = NULL;
+	spin_unlock(&pipe->lock);
+	rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
+	pipe->nwriters = 0;
+	if (need_release && pipe->ops->release_pipe)
+		pipe->ops->release_pipe(inode);
+	cancel_delayed_work_sync(&pipe->queue_timeout);
+	rpc_inode_setowner(inode, NULL);
+	RPC_I(inode)->pipe = NULL;
+	mutex_unlock(&inode->i_mutex);
+}
+
+static struct inode *
+rpc_alloc_inode(struct super_block *sb)
+{
+	struct rpc_inode *rpci;
+	rpci = kmem_cache_alloc(rpc_inode_cachep, GFP_KERNEL);
+	if (!rpci)
+		return NULL;
+	return &rpci->vfs_inode;
+}
+
+static void
+rpc_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
+}
+
+static void
+rpc_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, rpc_i_callback);
+}
+
+static int
+rpc_pipe_open(struct inode *inode, struct file *filp)
+{
+	struct rpc_pipe *pipe;
+	int first_open;
+	int res = -ENXIO;
+
+	mutex_lock(&inode->i_mutex);
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL)
+		goto out;
+	first_open = pipe->nreaders == 0 && pipe->nwriters == 0;
+	if (first_open && pipe->ops->open_pipe) {
+		res = pipe->ops->open_pipe(inode);
+		if (res)
+			goto out;
+	}
+	if (filp->f_mode & FMODE_READ)
+		pipe->nreaders++;
+	if (filp->f_mode & FMODE_WRITE)
+		pipe->nwriters++;
+	res = 0;
+out:
+	mutex_unlock(&inode->i_mutex);
+	return res;
+}
+
+static int
+rpc_pipe_release(struct inode *inode, struct file *filp)
+{
+	struct rpc_pipe *pipe;
+	struct rpc_pipe_msg *msg;
+	int last_close;
+
+	mutex_lock(&inode->i_mutex);
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL)
+		goto out;
+	msg = filp->private_data;
+	if (msg != NULL) {
+		spin_lock(&pipe->lock);
+		msg->errno = -EAGAIN;
+		list_del_init(&msg->list);
+		spin_unlock(&pipe->lock);
+		pipe->ops->destroy_msg(msg);
+	}
+	if (filp->f_mode & FMODE_WRITE)
+		pipe->nwriters --;
+	if (filp->f_mode & FMODE_READ) {
+		pipe->nreaders --;
+		if (pipe->nreaders == 0) {
+			LIST_HEAD(free_list);
+			spin_lock(&pipe->lock);
+			list_splice_init(&pipe->pipe, &free_list);
+			pipe->pipelen = 0;
+			spin_unlock(&pipe->lock);
+			rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
+					pipe->ops->destroy_msg, -EAGAIN);
+		}
+	}
+	last_close = pipe->nwriters == 0 && pipe->nreaders == 0;
+	if (last_close && pipe->ops->release_pipe)
+		pipe->ops->release_pipe(inode);
+out:
+	mutex_unlock(&inode->i_mutex);
+	return 0;
+}
+
+static ssize_t
+rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
+{
+	struct inode *inode = file_inode(filp);
+	struct rpc_pipe *pipe;
+	struct rpc_pipe_msg *msg;
+	int res = 0;
+
+	mutex_lock(&inode->i_mutex);
+	pipe = RPC_I(inode)->pipe;
+	if (pipe == NULL) {
+		res = -EPIPE;
+		goto out_unlock;
+	}
+	msg = filp->private_data;
+	if (msg == NULL) {
+		spin_lock(&pipe->lock);
+		if (!list_empty(&pipe->pipe)) {
+			msg = list_entry(pipe->pipe.next,
+					struct rpc_pipe_msg,
+					list);
+			list_move(&msg->list, &pipe->in_upcall);
+			pipe->pipelen -= msg->len;
+			filp->private_data = msg;
+			msg->copied = 0;
+		}
+		spin_unlock(&pipe->lock);
+		if (msg == NULL)
+			goto out_unlock;
+	}
+	/* NOTE: it is up to the callback to update msg->copied */
+	res = pipe->ops->upcall(filp, msg, buf, len);
+	if (res < 0 || msg->len == msg->copied) {
+		filp->private_data = NULL;
+		spin_lock(&pipe->lock);
+		list_del_init(&msg->list);
+		spin_unlock(&pipe->lock);
+		pipe->ops->destroy_msg(msg);
+	}
+out_unlock:
+	mutex_unlock(&inode->i_mutex);
+	return res;
+}
+
+static ssize_t
+rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)
+{
+	struct inode *inode = file_inode(filp);
+	int res;
+
+	mutex_lock(&inode->i_mutex);
+	res = -EPIPE;
+	if (RPC_I(inode)->pipe != NULL)
+		res = RPC_I(inode)->pipe->ops->downcall(filp, buf, len);
+	mutex_unlock(&inode->i_mutex);
+	return res;
+}
+
+static unsigned int
+rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
+{
+	struct inode *inode = file_inode(filp);
+	struct rpc_inode *rpci = RPC_I(inode);
+	unsigned int mask = POLLOUT | POLLWRNORM;
+
+	poll_wait(filp, &rpci->waitq, wait);
+
+	mutex_lock(&inode->i_mutex);
+	if (rpci->pipe == NULL)
+		mask |= POLLERR | POLLHUP;
+	else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
+		mask |= POLLIN | POLLRDNORM;
+	mutex_unlock(&inode->i_mutex);
+	return mask;
+}
+
+static long
+rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct rpc_pipe *pipe;
+	int len;
+
+	switch (cmd) {
+	case FIONREAD:
+		mutex_lock(&inode->i_mutex);
+		pipe = RPC_I(inode)->pipe;
+		if (pipe == NULL) {
+			mutex_unlock(&inode->i_mutex);
+			return -EPIPE;
+		}
+		spin_lock(&pipe->lock);
+		len = pipe->pipelen;
+		if (filp->private_data) {
+			struct rpc_pipe_msg *msg;
+			msg = filp->private_data;
+			len += msg->len - msg->copied;
+		}
+		spin_unlock(&pipe->lock);
+		mutex_unlock(&inode->i_mutex);
+		return put_user(len, (int __user *)arg);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct file_operations rpc_pipe_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= rpc_pipe_read,
+	.write		= rpc_pipe_write,
+	.poll		= rpc_pipe_poll,
+	.unlocked_ioctl	= rpc_pipe_ioctl,
+	.open		= rpc_pipe_open,
+	.release	= rpc_pipe_release,
+};
+
+static int
+rpc_show_info(struct seq_file *m, void *v)
+{
+	struct rpc_clnt *clnt = m->private;
+
+	rcu_read_lock();
+	seq_printf(m, "RPC server: %s\n",
+			rcu_dereference(clnt->cl_xprt)->servername);
+	seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_program->name,
+			clnt->cl_prog, clnt->cl_vers);
+	seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
+	seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
+	seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
+	rcu_read_unlock();
+	return 0;
+}
+
+static int
+rpc_info_open(struct inode *inode, struct file *file)
+{
+	struct rpc_clnt *clnt = NULL;
+	int ret = single_open(file, rpc_show_info, NULL);
+
+	if (!ret) {
+		struct seq_file *m = file->private_data;
+
+		spin_lock(&file->f_path.dentry->d_lock);
+		if (!d_unhashed(file->f_path.dentry))
+			clnt = RPC_I(inode)->private;
+		if (clnt != NULL && atomic_inc_not_zero(&clnt->cl_count)) {
+			spin_unlock(&file->f_path.dentry->d_lock);
+			m->private = clnt;
+		} else {
+			spin_unlock(&file->f_path.dentry->d_lock);
+			single_release(inode, file);
+			ret = -EINVAL;
+		}
+	}
+	return ret;
+}
+
+static int
+rpc_info_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *m = file->private_data;
+	struct rpc_clnt *clnt = (struct rpc_clnt *)m->private;
+
+	if (clnt)
+		rpc_release_client(clnt);
+	return single_release(inode, file);
+}
+
+static const struct file_operations rpc_info_operations = {
+	.owner		= THIS_MODULE,
+	.open		= rpc_info_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= rpc_info_release,
+};
+
+
+/*
+ * Description of fs contents.
+ */
+struct rpc_filelist {
+	const char *name;
+	const struct file_operations *i_fop;
+	umode_t mode;
+};
+
+static struct inode *
+rpc_get_inode(struct super_block *sb, umode_t mode)
+{
+	struct inode *inode = new_inode(sb);
+	if (!inode)
+		return NULL;
+	inode->i_ino = get_next_ino();
+	inode->i_mode = mode;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	switch (mode & S_IFMT) {
+	case S_IFDIR:
+		inode->i_fop = &simple_dir_operations;
+		inode->i_op = &simple_dir_inode_operations;
+		inc_nlink(inode);
+	default:
+		break;
+	}
+	return inode;
+}
+
+static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
+			       umode_t mode,
+			       const struct file_operations *i_fop,
+			       void *private)
+{
+	struct inode *inode;
+
+	d_drop(dentry);
+	inode = rpc_get_inode(dir->i_sb, mode);
+	if (!inode)
+		goto out_err;
+	inode->i_ino = iunique(dir->i_sb, 100);
+	if (i_fop)
+		inode->i_fop = i_fop;
+	if (private)
+		rpc_inode_setowner(inode, private);
+	d_add(dentry, inode);
+	return 0;
+out_err:
+	printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %pd\n",
+			__FILE__, __func__, dentry);
+	dput(dentry);
+	return -ENOMEM;
+}
+
+static int __rpc_create(struct inode *dir, struct dentry *dentry,
+			umode_t mode,
+			const struct file_operations *i_fop,
+			void *private)
+{
+	int err;
+
+	err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
+	if (err)
+		return err;
+	fsnotify_create(dir, dentry);
+	return 0;
+}
+
+static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
+		       umode_t mode,
+		       const struct file_operations *i_fop,
+		       void *private)
+{
+	int err;
+
+	err = __rpc_create_common(dir, dentry, S_IFDIR | mode, i_fop, private);
+	if (err)
+		return err;
+	inc_nlink(dir);
+	fsnotify_mkdir(dir, dentry);
+	return 0;
+}
+
+static void
+init_pipe(struct rpc_pipe *pipe)
+{
+	pipe->nreaders = 0;
+	pipe->nwriters = 0;
+	INIT_LIST_HEAD(&pipe->in_upcall);
+	INIT_LIST_HEAD(&pipe->in_downcall);
+	INIT_LIST_HEAD(&pipe->pipe);
+	pipe->pipelen = 0;
+	INIT_DELAYED_WORK(&pipe->queue_timeout,
+			    rpc_timeout_upcall_queue);
+	pipe->ops = NULL;
+	spin_lock_init(&pipe->lock);
+	pipe->dentry = NULL;
+}
+
+void rpc_destroy_pipe_data(struct rpc_pipe *pipe)
+{
+	kfree(pipe);
+}
+EXPORT_SYMBOL_GPL(rpc_destroy_pipe_data);
+
+struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags)
+{
+	struct rpc_pipe *pipe;
+
+	pipe = kzalloc(sizeof(struct rpc_pipe), GFP_KERNEL);
+	if (!pipe)
+		return ERR_PTR(-ENOMEM);
+	init_pipe(pipe);
+	pipe->ops = ops;
+	pipe->flags = flags;
+	return pipe;
+}
+EXPORT_SYMBOL_GPL(rpc_mkpipe_data);
+
+static int __rpc_mkpipe_dentry(struct inode *dir, struct dentry *dentry,
+			       umode_t mode,
+			       const struct file_operations *i_fop,
+			       void *private,
+			       struct rpc_pipe *pipe)
+{
+	struct rpc_inode *rpci;
+	int err;
+
+	err = __rpc_create_common(dir, dentry, S_IFIFO | mode, i_fop, private);
+	if (err)
+		return err;
+	rpci = RPC_I(d_inode(dentry));
+	rpci->private = private;
+	rpci->pipe = pipe;
+	fsnotify_create(dir, dentry);
+	return 0;
+}
+
+static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int ret;
+
+	dget(dentry);
+	ret = simple_rmdir(dir, dentry);
+	d_delete(dentry);
+	dput(dentry);
+	return ret;
+}
+
+int rpc_rmdir(struct dentry *dentry)
+{
+	struct dentry *parent;
+	struct inode *dir;
+	int error;
+
+	parent = dget_parent(dentry);
+	dir = d_inode(parent);
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	error = __rpc_rmdir(dir, dentry);
+	mutex_unlock(&dir->i_mutex);
+	dput(parent);
+	return error;
+}
+EXPORT_SYMBOL_GPL(rpc_rmdir);
+
+static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int ret;
+
+	dget(dentry);
+	ret = simple_unlink(dir, dentry);
+	d_delete(dentry);
+	dput(dentry);
+	return ret;
+}
+
+static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = d_inode(dentry);
+
+	rpc_close_pipes(inode);
+	return __rpc_unlink(dir, dentry);
+}
+
+static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
+					  const char *name)
+{
+	struct qstr q = QSTR_INIT(name, strlen(name));
+	struct dentry *dentry = d_hash_and_lookup(parent, &q);
+	if (!dentry) {
+		dentry = d_alloc(parent, &q);
+		if (!dentry)
+			return ERR_PTR(-ENOMEM);
+	}
+	if (d_really_is_negative(dentry))
+		return dentry;
+	dput(dentry);
+	return ERR_PTR(-EEXIST);
+}
+
+/*
+ * FIXME: This probably has races.
+ */
+static void __rpc_depopulate(struct dentry *parent,
+			     const struct rpc_filelist *files,
+			     int start, int eof)
+{
+	struct inode *dir = d_inode(parent);
+	struct dentry *dentry;
+	struct qstr name;
+	int i;
+
+	for (i = start; i < eof; i++) {
+		name.name = files[i].name;
+		name.len = strlen(files[i].name);
+		dentry = d_hash_and_lookup(parent, &name);
+
+		if (dentry == NULL)
+			continue;
+		if (d_really_is_negative(dentry))
+			goto next;
+		switch (d_inode(dentry)->i_mode & S_IFMT) {
+			default:
+				BUG();
+			case S_IFREG:
+				__rpc_unlink(dir, dentry);
+				break;
+			case S_IFDIR:
+				__rpc_rmdir(dir, dentry);
+		}
+next:
+		dput(dentry);
+	}
+}
+
+static void rpc_depopulate(struct dentry *parent,
+			   const struct rpc_filelist *files,
+			   int start, int eof)
+{
+	struct inode *dir = d_inode(parent);
+
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
+	__rpc_depopulate(parent, files, start, eof);
+	mutex_unlock(&dir->i_mutex);
+}
+
+static int rpc_populate(struct dentry *parent,
+			const struct rpc_filelist *files,
+			int start, int eof,
+			void *private)
+{
+	struct inode *dir = d_inode(parent);
+	struct dentry *dentry;
+	int i, err;
+
+	mutex_lock(&dir->i_mutex);
+	for (i = start; i < eof; i++) {
+		dentry = __rpc_lookup_create_exclusive(parent, files[i].name);
+		err = PTR_ERR(dentry);
+		if (IS_ERR(dentry))
+			goto out_bad;
+		switch (files[i].mode & S_IFMT) {
+			default:
+				BUG();
+			case S_IFREG:
+				err = __rpc_create(dir, dentry,
+						files[i].mode,
+						files[i].i_fop,
+						private);
+				break;
+			case S_IFDIR:
+				err = __rpc_mkdir(dir, dentry,
+						files[i].mode,
+						NULL,
+						private);
+		}
+		if (err != 0)
+			goto out_bad;
+	}
+	mutex_unlock(&dir->i_mutex);
+	return 0;
+out_bad:
+	__rpc_depopulate(parent, files, start, eof);
+	mutex_unlock(&dir->i_mutex);
+	printk(KERN_WARNING "%s: %s failed to populate directory %pd\n",
+			__FILE__, __func__, parent);
+	return err;
+}
+
+static struct dentry *rpc_mkdir_populate(struct dentry *parent,
+		const char *name, umode_t mode, void *private,
+		int (*populate)(struct dentry *, void *), void *args_populate)
+{
+	struct dentry *dentry;
+	struct inode *dir = d_inode(parent);
+	int error;
+
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	dentry = __rpc_lookup_create_exclusive(parent, name);
+	if (IS_ERR(dentry))
+		goto out;
+	error = __rpc_mkdir(dir, dentry, mode, NULL, private);
+	if (error != 0)
+		goto out_err;
+	if (populate != NULL) {
+		error = populate(dentry, args_populate);
+		if (error)
+			goto err_rmdir;
+	}
+out:
+	mutex_unlock(&dir->i_mutex);
+	return dentry;
+err_rmdir:
+	__rpc_rmdir(dir, dentry);
+out_err:
+	dentry = ERR_PTR(error);
+	goto out;
+}
+
+static int rpc_rmdir_depopulate(struct dentry *dentry,
+		void (*depopulate)(struct dentry *))
+{
+	struct dentry *parent;
+	struct inode *dir;
+	int error;
+
+	parent = dget_parent(dentry);
+	dir = d_inode(parent);
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	if (depopulate != NULL)
+		depopulate(dentry);
+	error = __rpc_rmdir(dir, dentry);
+	mutex_unlock(&dir->i_mutex);
+	dput(parent);
+	return error;
+}
+
+/**
+ * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
+ * @parent: dentry of directory to create new "pipe" in
+ * @name: name of pipe
+ * @private: private data to associate with the pipe, for the caller's use
+ * @pipe: &rpc_pipe containing input parameters
+ *
+ * Data is made available for userspace to read by calls to
+ * rpc_queue_upcall().  The actual reads will result in calls to
+ * @ops->upcall, which will be called with the file pointer,
+ * message, and userspace buffer to copy to.
+ *
+ * Writes can come at any time, and do not necessarily have to be
+ * responses to upcalls.  They will result in calls to @msg->downcall.
+ *
+ * The @private argument passed here will be available to all these methods
+ * from the file pointer, via RPC_I(file_inode(file))->private.
+ */
+struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
+				 void *private, struct rpc_pipe *pipe)
+{
+	struct dentry *dentry;
+	struct inode *dir = d_inode(parent);
+	umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
+	int err;
+
+	if (pipe->ops->upcall == NULL)
+		umode &= ~S_IRUGO;
+	if (pipe->ops->downcall == NULL)
+		umode &= ~S_IWUGO;
+
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	dentry = __rpc_lookup_create_exclusive(parent, name);
+	if (IS_ERR(dentry))
+		goto out;
+	err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
+				  private, pipe);
+	if (err)
+		goto out_err;
+out:
+	mutex_unlock(&dir->i_mutex);
+	return dentry;
+out_err:
+	dentry = ERR_PTR(err);
+	printk(KERN_WARNING "%s: %s() failed to create pipe %pd/%s (errno = %d)\n",
+			__FILE__, __func__, parent, name,
+			err);
+	goto out;
+}
+EXPORT_SYMBOL_GPL(rpc_mkpipe_dentry);
+
+/**
+ * rpc_unlink - remove a pipe
+ * @dentry: dentry for the pipe, as returned from rpc_mkpipe
+ *
+ * After this call, lookups will no longer find the pipe, and any
+ * attempts to read or write using preexisting opens of the pipe will
+ * return -EPIPE.
+ */
+int
+rpc_unlink(struct dentry *dentry)
+{
+	struct dentry *parent;
+	struct inode *dir;
+	int error = 0;
+
+	parent = dget_parent(dentry);
+	dir = d_inode(parent);
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	error = __rpc_rmpipe(dir, dentry);
+	mutex_unlock(&dir->i_mutex);
+	dput(parent);
+	return error;
+}
+EXPORT_SYMBOL_GPL(rpc_unlink);
+
+/**
+ * rpc_init_pipe_dir_head - initialise a struct rpc_pipe_dir_head
+ * @pdh: pointer to struct rpc_pipe_dir_head
+ */
+void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh)
+{
+	INIT_LIST_HEAD(&pdh->pdh_entries);
+	pdh->pdh_dentry = NULL;
+}
+EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_head);
+
+/**
+ * rpc_init_pipe_dir_object - initialise a struct rpc_pipe_dir_object
+ * @pdo: pointer to struct rpc_pipe_dir_object
+ * @pdo_ops: pointer to const struct rpc_pipe_dir_object_ops
+ * @pdo_data: pointer to caller-defined data
+ */
+void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
+		const struct rpc_pipe_dir_object_ops *pdo_ops,
+		void *pdo_data)
+{
+	INIT_LIST_HEAD(&pdo->pdo_head);
+	pdo->pdo_ops = pdo_ops;
+	pdo->pdo_data = pdo_data;
+}
+EXPORT_SYMBOL_GPL(rpc_init_pipe_dir_object);
+
+static int
+rpc_add_pipe_dir_object_locked(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo)
+{
+	int ret = 0;
+
+	if (pdh->pdh_dentry)
+		ret = pdo->pdo_ops->create(pdh->pdh_dentry, pdo);
+	if (ret == 0)
+		list_add_tail(&pdo->pdo_head, &pdh->pdh_entries);
+	return ret;
+}
+
+static void
+rpc_remove_pipe_dir_object_locked(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo)
+{
+	if (pdh->pdh_dentry)
+		pdo->pdo_ops->destroy(pdh->pdh_dentry, pdo);
+	list_del_init(&pdo->pdo_head);
+}
+
+/**
+ * rpc_add_pipe_dir_object - associate a rpc_pipe_dir_object to a directory
+ * @net: pointer to struct net
+ * @pdh: pointer to struct rpc_pipe_dir_head
+ * @pdo: pointer to struct rpc_pipe_dir_object
+ *
+ */
+int
+rpc_add_pipe_dir_object(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo)
+{
+	int ret = 0;
+
+	if (list_empty(&pdo->pdo_head)) {
+		struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+		mutex_lock(&sn->pipefs_sb_lock);
+		ret = rpc_add_pipe_dir_object_locked(net, pdh, pdo);
+		mutex_unlock(&sn->pipefs_sb_lock);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_add_pipe_dir_object);
+
+/**
+ * rpc_remove_pipe_dir_object - remove a rpc_pipe_dir_object from a directory
+ * @net: pointer to struct net
+ * @pdh: pointer to struct rpc_pipe_dir_head
+ * @pdo: pointer to struct rpc_pipe_dir_object
+ *
+ */
+void
+rpc_remove_pipe_dir_object(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo)
+{
+	if (!list_empty(&pdo->pdo_head)) {
+		struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+		mutex_lock(&sn->pipefs_sb_lock);
+		rpc_remove_pipe_dir_object_locked(net, pdh, pdo);
+		mutex_unlock(&sn->pipefs_sb_lock);
+	}
+}
+EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);
+
+/**
+ * rpc_find_or_alloc_pipe_dir_object
+ * @net: pointer to struct net
+ * @pdh: pointer to struct rpc_pipe_dir_head
+ * @match: match struct rpc_pipe_dir_object to data
+ * @alloc: allocate a new struct rpc_pipe_dir_object
+ * @data: user defined data for match() and alloc()
+ *
+ */
+struct rpc_pipe_dir_object *
+rpc_find_or_alloc_pipe_dir_object(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		int (*match)(struct rpc_pipe_dir_object *, void *),
+		struct rpc_pipe_dir_object *(*alloc)(void *),
+		void *data)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_pipe_dir_object *pdo;
+
+	mutex_lock(&sn->pipefs_sb_lock);
+	list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {
+		if (!match(pdo, data))
+			continue;
+		goto out;
+	}
+	pdo = alloc(data);
+	if (!pdo)
+		goto out;
+	rpc_add_pipe_dir_object_locked(net, pdh, pdo);
+out:
+	mutex_unlock(&sn->pipefs_sb_lock);
+	return pdo;
+}
+EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);
+
+static void
+rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
+{
+	struct rpc_pipe_dir_object *pdo;
+	struct dentry *dir = pdh->pdh_dentry;
+
+	list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
+		pdo->pdo_ops->create(dir, pdo);
+}
+
+static void
+rpc_destroy_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
+{
+	struct rpc_pipe_dir_object *pdo;
+	struct dentry *dir = pdh->pdh_dentry;
+
+	list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head)
+		pdo->pdo_ops->destroy(dir, pdo);
+}
+
+enum {
+	RPCAUTH_info,
+	RPCAUTH_EOF
+};
+
+static const struct rpc_filelist authfiles[] = {
+	[RPCAUTH_info] = {
+		.name = "info",
+		.i_fop = &rpc_info_operations,
+		.mode = S_IFREG | S_IRUSR,
+	},
+};
+
+static int rpc_clntdir_populate(struct dentry *dentry, void *private)
+{
+	return rpc_populate(dentry,
+			    authfiles, RPCAUTH_info, RPCAUTH_EOF,
+			    private);
+}
+
+static void rpc_clntdir_depopulate(struct dentry *dentry)
+{
+	rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
+}
+
+/**
+ * rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
+ * @dentry: the parent of new directory
+ * @name: the name of new directory
+ * @rpc_client: rpc client to associate with this directory
+ *
+ * This creates a directory at the given @path associated with
+ * @rpc_clnt, which will contain a file named "info" with some basic
+ * information about the client, together with any "pipes" that may
+ * later be created using rpc_mkpipe().
+ */
+struct dentry *rpc_create_client_dir(struct dentry *dentry,
+				   const char *name,
+				   struct rpc_clnt *rpc_client)
+{
+	struct dentry *ret;
+
+	ret = rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
+			rpc_clntdir_populate, rpc_client);
+	if (!IS_ERR(ret)) {
+		rpc_client->cl_pipedir_objects.pdh_dentry = ret;
+		rpc_create_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
+	}
+	return ret;
+}
+
+/**
+ * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
+ * @rpc_client: rpc_client for the pipe
+ */
+int rpc_remove_client_dir(struct rpc_clnt *rpc_client)
+{
+	struct dentry *dentry = rpc_client->cl_pipedir_objects.pdh_dentry;
+
+	if (dentry == NULL)
+		return 0;
+	rpc_destroy_pipe_dir_objects(&rpc_client->cl_pipedir_objects);
+	rpc_client->cl_pipedir_objects.pdh_dentry = NULL;
+	return rpc_rmdir_depopulate(dentry, rpc_clntdir_depopulate);
+}
+
+static const struct rpc_filelist cache_pipefs_files[3] = {
+	[0] = {
+		.name = "channel",
+		.i_fop = &cache_file_operations_pipefs,
+		.mode = S_IFREG|S_IRUSR|S_IWUSR,
+	},
+	[1] = {
+		.name = "content",
+		.i_fop = &content_file_operations_pipefs,
+		.mode = S_IFREG|S_IRUSR,
+	},
+	[2] = {
+		.name = "flush",
+		.i_fop = &cache_flush_operations_pipefs,
+		.mode = S_IFREG|S_IRUSR|S_IWUSR,
+	},
+};
+
+static int rpc_cachedir_populate(struct dentry *dentry, void *private)
+{
+	return rpc_populate(dentry,
+			    cache_pipefs_files, 0, 3,
+			    private);
+}
+
+static void rpc_cachedir_depopulate(struct dentry *dentry)
+{
+	rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
+}
+
+struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name,
+				    umode_t umode, struct cache_detail *cd)
+{
+	return rpc_mkdir_populate(parent, name, umode, NULL,
+			rpc_cachedir_populate, cd);
+}
+
+void rpc_remove_cache_dir(struct dentry *dentry)
+{
+	rpc_rmdir_depopulate(dentry, rpc_cachedir_depopulate);
+}
+
+/*
+ * populate the filesystem
+ */
+static const struct super_operations s_ops = {
+	.alloc_inode	= rpc_alloc_inode,
+	.destroy_inode	= rpc_destroy_inode,
+	.statfs		= simple_statfs,
+};
+
+#define RPCAUTH_GSSMAGIC 0x67596969
+
+/*
+ * We have a single directory with 1 node in it.
+ */
+enum {
+	RPCAUTH_lockd,
+	RPCAUTH_mount,
+	RPCAUTH_nfs,
+	RPCAUTH_portmap,
+	RPCAUTH_statd,
+	RPCAUTH_nfsd4_cb,
+	RPCAUTH_cache,
+	RPCAUTH_nfsd,
+	RPCAUTH_gssd,
+	RPCAUTH_RootEOF
+};
+
+static const struct rpc_filelist files[] = {
+	[RPCAUTH_lockd] = {
+		.name = "lockd",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_mount] = {
+		.name = "mount",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_nfs] = {
+		.name = "nfs",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_portmap] = {
+		.name = "portmap",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_statd] = {
+		.name = "statd",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_nfsd4_cb] = {
+		.name = "nfsd4_cb",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_cache] = {
+		.name = "cache",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_nfsd] = {
+		.name = "nfsd",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+	[RPCAUTH_gssd] = {
+		.name = "gssd",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+};
+
+/*
+ * This call can be used only in RPC pipefs mount notification hooks.
+ */
+struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
+			       const unsigned char *dir_name)
+{
+	struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
+	return d_hash_and_lookup(sb->s_root, &dir);
+}
+EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
+
+int rpc_pipefs_init_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0);
+	if (IS_ERR(sn->gssd_dummy))
+		return PTR_ERR(sn->gssd_dummy);
+
+	mutex_init(&sn->pipefs_sb_lock);
+	sn->pipe_version = -1;
+	return 0;
+}
+
+void rpc_pipefs_exit_net(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	rpc_destroy_pipe_data(sn->gssd_dummy);
+}
+
+/*
+ * This call will be used for per network namespace operations calls.
+ * Note: Function will be returned with pipefs_sb_lock taken if superblock was
+ * found. This lock have to be released by rpc_put_sb_net() when all operations
+ * will be completed.
+ */
+struct super_block *rpc_get_sb_net(const struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	mutex_lock(&sn->pipefs_sb_lock);
+	if (sn->pipefs_sb)
+		return sn->pipefs_sb;
+	mutex_unlock(&sn->pipefs_sb_lock);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(rpc_get_sb_net);
+
+void rpc_put_sb_net(const struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	WARN_ON(sn->pipefs_sb == NULL);
+	mutex_unlock(&sn->pipefs_sb_lock);
+}
+EXPORT_SYMBOL_GPL(rpc_put_sb_net);
+
+static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
+	[0] = {
+		.name = "clntXX",
+		.mode = S_IFDIR | S_IRUGO | S_IXUGO,
+	},
+};
+
+static ssize_t
+dummy_downcall(struct file *filp, const char __user *src, size_t len)
+{
+	return -EINVAL;
+}
+
+static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
+	.upcall		= rpc_pipe_generic_upcall,
+	.downcall	= dummy_downcall,
+};
+
+/*
+ * Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect
+ * that it will ever use this info to handle an upcall, but rpc.gssd expects
+ * that this file will be there and have a certain format.
+ */
+static int
+rpc_show_dummy_info(struct seq_file *m, void *v)
+{
+	seq_printf(m, "RPC server: %s\n", utsname()->nodename);
+	seq_printf(m, "service: foo (1) version 0\n");
+	seq_printf(m, "address: 127.0.0.1\n");
+	seq_printf(m, "protocol: tcp\n");
+	seq_printf(m, "port: 0\n");
+	return 0;
+}
+
+static int
+rpc_dummy_info_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, rpc_show_dummy_info, NULL);
+}
+
+static const struct file_operations rpc_dummy_info_operations = {
+	.owner		= THIS_MODULE,
+	.open		= rpc_dummy_info_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct rpc_filelist gssd_dummy_info_file[] = {
+	[0] = {
+		.name = "info",
+		.i_fop = &rpc_dummy_info_operations,
+		.mode = S_IFREG | S_IRUSR,
+	},
+};
+
+/**
+ * rpc_gssd_dummy_populate - create a dummy gssd pipe
+ * @root:	root of the rpc_pipefs filesystem
+ * @pipe_data:	pipe data created when netns is initialized
+ *
+ * Create a dummy set of directories and a pipe that gssd can hold open to
+ * indicate that it is up and running.
+ */
+static struct dentry *
+rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
+{
+	int ret = 0;
+	struct dentry *gssd_dentry;
+	struct dentry *clnt_dentry = NULL;
+	struct dentry *pipe_dentry = NULL;
+	struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
+				  strlen(files[RPCAUTH_gssd].name));
+
+	/* We should never get this far if "gssd" doesn't exist */
+	gssd_dentry = d_hash_and_lookup(root, &q);
+	if (!gssd_dentry)
+		return ERR_PTR(-ENOENT);
+
+	ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
+	if (ret) {
+		pipe_dentry = ERR_PTR(ret);
+		goto out;
+	}
+
+	q.name = gssd_dummy_clnt_dir[0].name;
+	q.len = strlen(gssd_dummy_clnt_dir[0].name);
+	clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
+	if (!clnt_dentry) {
+		pipe_dentry = ERR_PTR(-ENOENT);
+		goto out;
+	}
+
+	ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
+	if (ret) {
+		__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
+		pipe_dentry = ERR_PTR(ret);
+		goto out;
+	}
+
+	pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
+	if (IS_ERR(pipe_dentry)) {
+		__rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1);
+		__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
+	}
+out:
+	dput(clnt_dentry);
+	dput(gssd_dentry);
+	return pipe_dentry;
+}
+
+static void
+rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry)
+{
+	struct dentry *clnt_dir = pipe_dentry->d_parent;
+	struct dentry *gssd_dir = clnt_dir->d_parent;
+
+	__rpc_rmpipe(d_inode(clnt_dir), pipe_dentry);
+	__rpc_depopulate(clnt_dir, gssd_dummy_info_file, 0, 1);
+	__rpc_depopulate(gssd_dir, gssd_dummy_clnt_dir, 0, 1);
+	dput(pipe_dentry);
+}
+
+static int
+rpc_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *inode;
+	struct dentry *root, *gssd_dentry;
+	struct net *net = data;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	int err;
+
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+	sb->s_magic = RPCAUTH_GSSMAGIC;
+	sb->s_op = &s_ops;
+	sb->s_d_op = &simple_dentry_operations;
+	sb->s_time_gran = 1;
+
+	inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+	sb->s_root = root = d_make_root(inode);
+	if (!root)
+		return -ENOMEM;
+	if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
+		return -ENOMEM;
+
+	gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy);
+	if (IS_ERR(gssd_dentry)) {
+		__rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
+		return PTR_ERR(gssd_dentry);
+	}
+
+	dprintk("RPC:       sending pipefs MOUNT notification for net %p%s\n",
+		net, NET_NAME(net));
+	mutex_lock(&sn->pipefs_sb_lock);
+	sn->pipefs_sb = sb;
+	err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
+					   RPC_PIPEFS_MOUNT,
+					   sb);
+	if (err)
+		goto err_depopulate;
+	sb->s_fs_info = get_net(net);
+	mutex_unlock(&sn->pipefs_sb_lock);
+	return 0;
+
+err_depopulate:
+	rpc_gssd_dummy_depopulate(gssd_dentry);
+	blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
+					   RPC_PIPEFS_UMOUNT,
+					   sb);
+	sn->pipefs_sb = NULL;
+	__rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
+	mutex_unlock(&sn->pipefs_sb_lock);
+	return err;
+}
+
+bool
+gssd_running(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_pipe *pipe = sn->gssd_dummy;
+
+	return pipe->nreaders || pipe->nwriters;
+}
+EXPORT_SYMBOL_GPL(gssd_running);
+
+static struct dentry *
+rpc_mount(struct file_system_type *fs_type,
+		int flags, const char *dev_name, void *data)
+{
+	return mount_ns(fs_type, flags, current->nsproxy->net_ns, rpc_fill_super);
+}
+
+static void rpc_kill_sb(struct super_block *sb)
+{
+	struct net *net = sb->s_fs_info;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	mutex_lock(&sn->pipefs_sb_lock);
+	if (sn->pipefs_sb != sb) {
+		mutex_unlock(&sn->pipefs_sb_lock);
+		goto out;
+	}
+	sn->pipefs_sb = NULL;
+	dprintk("RPC:       sending pipefs UMOUNT notification for net %p%s\n",
+		net, NET_NAME(net));
+	blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
+					   RPC_PIPEFS_UMOUNT,
+					   sb);
+	mutex_unlock(&sn->pipefs_sb_lock);
+	put_net(net);
+out:
+	kill_litter_super(sb);
+}
+
+static struct file_system_type rpc_pipe_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "rpc_pipefs",
+	.mount		= rpc_mount,
+	.kill_sb	= rpc_kill_sb,
+};
+MODULE_ALIAS_FS("rpc_pipefs");
+MODULE_ALIAS("rpc_pipefs");
+
+static void
+init_once(void *foo)
+{
+	struct rpc_inode *rpci = (struct rpc_inode *) foo;
+
+	inode_init_once(&rpci->vfs_inode);
+	rpci->private = NULL;
+	rpci->pipe = NULL;
+	init_waitqueue_head(&rpci->waitq);
+}
+
+int register_rpc_pipefs(void)
+{
+	int err;
+
+	rpc_inode_cachep = kmem_cache_create("rpc_inode_cache",
+				sizeof(struct rpc_inode),
+				0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD),
+				init_once);
+	if (!rpc_inode_cachep)
+		return -ENOMEM;
+	err = rpc_clients_notifier_register();
+	if (err)
+		goto err_notifier;
+	err = register_filesystem(&rpc_pipe_fs_type);
+	if (err)
+		goto err_register;
+	return 0;
+
+err_register:
+	rpc_clients_notifier_unregister();
+err_notifier:
+	kmem_cache_destroy(rpc_inode_cachep);
+	return err;
+}
+
+void unregister_rpc_pipefs(void)
+{
+	rpc_clients_notifier_unregister();
+	kmem_cache_destroy(rpc_inode_cachep);
+	unregister_filesystem(&rpc_pipe_fs_type);
+}
diff --git a/kernel/net/sunrpc/rpcb_clnt.c b/kernel/net/sunrpc/rpcb_clnt.c
new file mode 100644
index 000000000..cf5770d8f
--- /dev/null
+++ b/kernel/net/sunrpc/rpcb_clnt.c
@@ -0,0 +1,1151 @@
+/*
+ * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
+ * protocol
+ *
+ * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
+ * RFC 3530: "Network File System (NFS) version 4 Protocol"
+ *
+ * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
+ * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
+ *
+ * Descended from net/sunrpc/pmap_clnt.c,
+ *  Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/un.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <net/ipv6.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprtsock.h>
+
+#include "netns.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_BIND
+#endif
+
+#define RPCBIND_SOCK_PATHNAME	"/var/run/rpcbind.sock"
+
+#define RPCBIND_PROGRAM		(100000u)
+#define RPCBIND_PORT		(111u)
+
+#define RPCBVERS_2		(2u)
+#define RPCBVERS_3		(3u)
+#define RPCBVERS_4		(4u)
+
+enum {
+	RPCBPROC_NULL,
+	RPCBPROC_SET,
+	RPCBPROC_UNSET,
+	RPCBPROC_GETPORT,
+	RPCBPROC_GETADDR = 3,		/* alias for GETPORT */
+	RPCBPROC_DUMP,
+	RPCBPROC_CALLIT,
+	RPCBPROC_BCAST = 5,		/* alias for CALLIT */
+	RPCBPROC_GETTIME,
+	RPCBPROC_UADDR2TADDR,
+	RPCBPROC_TADDR2UADDR,
+	RPCBPROC_GETVERSADDR,
+	RPCBPROC_INDIRECT,
+	RPCBPROC_GETADDRLIST,
+	RPCBPROC_GETSTAT,
+};
+
+/*
+ * r_owner
+ *
+ * The "owner" is allowed to unset a service in the rpcbind database.
+ *
+ * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
+ * UID which it maps to a local user name via a password lookup.
+ * In all other cases it is ignored.
+ *
+ * For SET/UNSET requests, user space provides a value, even for
+ * network requests, and GETADDR uses an empty string.  We follow
+ * those precedents here.
+ */
+#define RPCB_OWNER_STRING	"0"
+#define RPCB_MAXOWNERLEN	sizeof(RPCB_OWNER_STRING)
+
+/*
+ * XDR data type sizes
+ */
+#define RPCB_program_sz		(1)
+#define RPCB_version_sz		(1)
+#define RPCB_protocol_sz	(1)
+#define RPCB_port_sz		(1)
+#define RPCB_boolean_sz		(1)
+
+#define RPCB_netid_sz		(1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
+#define RPCB_addr_sz		(1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
+#define RPCB_ownerstring_sz	(1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
+
+/*
+ * XDR argument and result sizes
+ */
+#define RPCB_mappingargs_sz	(RPCB_program_sz + RPCB_version_sz + \
+				RPCB_protocol_sz + RPCB_port_sz)
+#define RPCB_getaddrargs_sz	(RPCB_program_sz + RPCB_version_sz + \
+				RPCB_netid_sz + RPCB_addr_sz + \
+				RPCB_ownerstring_sz)
+
+#define RPCB_getportres_sz	RPCB_port_sz
+#define RPCB_setres_sz		RPCB_boolean_sz
+
+/*
+ * Note that RFC 1833 does not put any size restrictions on the
+ * address string returned by the remote rpcbind database.
+ */
+#define RPCB_getaddrres_sz	RPCB_addr_sz
+
+static void			rpcb_getport_done(struct rpc_task *, void *);
+static void			rpcb_map_release(void *data);
+static const struct rpc_program	rpcb_program;
+
+struct rpcbind_args {
+	struct rpc_xprt *	r_xprt;
+
+	u32			r_prog;
+	u32			r_vers;
+	u32			r_prot;
+	unsigned short		r_port;
+	const char *		r_netid;
+	const char *		r_addr;
+	const char *		r_owner;
+
+	int			r_status;
+};
+
+static struct rpc_procinfo rpcb_procedures2[];
+static struct rpc_procinfo rpcb_procedures3[];
+static struct rpc_procinfo rpcb_procedures4[];
+
+struct rpcb_info {
+	u32			rpc_vers;
+	struct rpc_procinfo *	rpc_proc;
+};
+
+static const struct rpcb_info rpcb_next_version[];
+static const struct rpcb_info rpcb_next_version6[];
+
+static const struct rpc_call_ops rpcb_getport_ops = {
+	.rpc_call_done		= rpcb_getport_done,
+	.rpc_release		= rpcb_map_release,
+};
+
+static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
+{
+	xprt_clear_binding(xprt);
+	rpc_wake_up_status(&xprt->binding, status);
+}
+
+static void rpcb_map_release(void *data)
+{
+	struct rpcbind_args *map = data;
+
+	rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
+	xprt_put(map->r_xprt);
+	kfree(map->r_addr);
+	kfree(map);
+}
+
+static int rpcb_get_local(struct net *net)
+{
+	int cnt;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	spin_lock(&sn->rpcb_clnt_lock);
+	if (sn->rpcb_users)
+		sn->rpcb_users++;
+	cnt = sn->rpcb_users;
+	spin_unlock(&sn->rpcb_clnt_lock);
+
+	return cnt;
+}
+
+void rpcb_put_local(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct rpc_clnt *clnt = sn->rpcb_local_clnt;
+	struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
+	int shutdown = 0;
+
+	spin_lock(&sn->rpcb_clnt_lock);
+	if (sn->rpcb_users) {
+		if (--sn->rpcb_users == 0) {
+			sn->rpcb_local_clnt = NULL;
+			sn->rpcb_local_clnt4 = NULL;
+		}
+		shutdown = !sn->rpcb_users;
+	}
+	spin_unlock(&sn->rpcb_clnt_lock);
+
+	if (shutdown) {
+		/*
+		 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
+		 */
+		if (clnt4)
+			rpc_shutdown_client(clnt4);
+		if (clnt)
+			rpc_shutdown_client(clnt);
+	}
+}
+
+static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
+			struct rpc_clnt *clnt4,
+			bool is_af_local)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	/* Protected by rpcb_create_local_mutex */
+	sn->rpcb_local_clnt = clnt;
+	sn->rpcb_local_clnt4 = clnt4;
+	sn->rpcb_is_af_local = is_af_local ? 1 : 0;
+	smp_wmb(); 
+	sn->rpcb_users = 1;
+	dprintk("RPC:       created new rpcb local clients (rpcb_local_clnt: "
+			"%p, rpcb_local_clnt4: %p) for net %p%s\n",
+			sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
+			net, (net == &init_net) ? " (init_net)" : "");
+}
+
+/*
+ * Returns zero on success, otherwise a negative errno value
+ * is returned.
+ */
+static int rpcb_create_local_unix(struct net *net)
+{
+	static const struct sockaddr_un rpcb_localaddr_rpcbind = {
+		.sun_family		= AF_LOCAL,
+		.sun_path		= RPCBIND_SOCK_PATHNAME,
+	};
+	struct rpc_create_args args = {
+		.net		= net,
+		.protocol	= XPRT_TRANSPORT_LOCAL,
+		.address	= (struct sockaddr *)&rpcb_localaddr_rpcbind,
+		.addrsize	= sizeof(rpcb_localaddr_rpcbind),
+		.servername	= "localhost",
+		.program	= &rpcb_program,
+		.version	= RPCBVERS_2,
+		.authflavor	= RPC_AUTH_NULL,
+		/*
+		 * We turn off the idle timeout to prevent the kernel
+		 * from automatically disconnecting the socket.
+		 * Otherwise, we'd have to cache the mount namespace
+		 * of the caller and somehow pass that to the socket
+		 * reconnect code.
+		 */
+		.flags		= RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
+	};
+	struct rpc_clnt *clnt, *clnt4;
+	int result = 0;
+
+	/*
+	 * Because we requested an RPC PING at transport creation time,
+	 * this works only if the user space portmapper is rpcbind, and
+	 * it's listening on AF_LOCAL on the named socket.
+	 */
+	clnt = rpc_create(&args);
+	if (IS_ERR(clnt)) {
+		dprintk("RPC:       failed to create AF_LOCAL rpcbind "
+				"client (errno %ld).\n", PTR_ERR(clnt));
+		result = PTR_ERR(clnt);
+		goto out;
+	}
+
+	clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
+	if (IS_ERR(clnt4)) {
+		dprintk("RPC:       failed to bind second program to "
+				"rpcbind v4 client (errno %ld).\n",
+				PTR_ERR(clnt4));
+		clnt4 = NULL;
+	}
+
+	rpcb_set_local(net, clnt, clnt4, true);
+
+out:
+	return result;
+}
+
+/*
+ * Returns zero on success, otherwise a negative errno value
+ * is returned.
+ */
+static int rpcb_create_local_net(struct net *net)
+{
+	static const struct sockaddr_in rpcb_inaddr_loopback = {
+		.sin_family		= AF_INET,
+		.sin_addr.s_addr	= htonl(INADDR_LOOPBACK),
+		.sin_port		= htons(RPCBIND_PORT),
+	};
+	struct rpc_create_args args = {
+		.net		= net,
+		.protocol	= XPRT_TRANSPORT_TCP,
+		.address	= (struct sockaddr *)&rpcb_inaddr_loopback,
+		.addrsize	= sizeof(rpcb_inaddr_loopback),
+		.servername	= "localhost",
+		.program	= &rpcb_program,
+		.version	= RPCBVERS_2,
+		.authflavor	= RPC_AUTH_UNIX,
+		.flags		= RPC_CLNT_CREATE_NOPING,
+	};
+	struct rpc_clnt *clnt, *clnt4;
+	int result = 0;
+
+	clnt = rpc_create(&args);
+	if (IS_ERR(clnt)) {
+		dprintk("RPC:       failed to create local rpcbind "
+				"client (errno %ld).\n", PTR_ERR(clnt));
+		result = PTR_ERR(clnt);
+		goto out;
+	}
+
+	/*
+	 * This results in an RPC ping.  On systems running portmapper,
+	 * the v4 ping will fail.  Proceed anyway, but disallow rpcb
+	 * v4 upcalls.
+	 */
+	clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
+	if (IS_ERR(clnt4)) {
+		dprintk("RPC:       failed to bind second program to "
+				"rpcbind v4 client (errno %ld).\n",
+				PTR_ERR(clnt4));
+		clnt4 = NULL;
+	}
+
+	rpcb_set_local(net, clnt, clnt4, false);
+
+out:
+	return result;
+}
+
+/*
+ * Returns zero on success, otherwise a negative errno value
+ * is returned.
+ */
+int rpcb_create_local(struct net *net)
+{
+	static DEFINE_MUTEX(rpcb_create_local_mutex);
+	int result = 0;
+
+	if (rpcb_get_local(net))
+		return result;
+
+	mutex_lock(&rpcb_create_local_mutex);
+	if (rpcb_get_local(net))
+		goto out;
+
+	if (rpcb_create_local_unix(net) != 0)
+		result = rpcb_create_local_net(net);
+
+out:
+	mutex_unlock(&rpcb_create_local_mutex);
+	return result;
+}
+
+static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
+				    const char *hostname,
+				    struct sockaddr *srvaddr, size_t salen,
+				    int proto, u32 version)
+{
+	struct rpc_create_args args = {
+		.net		= net,
+		.protocol	= proto,
+		.address	= srvaddr,
+		.addrsize	= salen,
+		.servername	= hostname,
+		.nodename	= nodename,
+		.program	= &rpcb_program,
+		.version	= version,
+		.authflavor	= RPC_AUTH_UNIX,
+		.flags		= (RPC_CLNT_CREATE_NOPING |
+					RPC_CLNT_CREATE_NONPRIVPORT),
+	};
+
+	switch (srvaddr->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
+		break;
+	default:
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
+	return rpc_create(&args);
+}
+
+static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
+{
+	int flags = RPC_TASK_NOCONNECT;
+	int error, result = 0;
+
+	if (is_set || !sn->rpcb_is_af_local)
+		flags = RPC_TASK_SOFTCONN;
+	msg->rpc_resp = &result;
+
+	error = rpc_call_sync(clnt, msg, flags);
+	if (error < 0) {
+		dprintk("RPC:       failed to contact local rpcbind "
+				"server (errno %d).\n", -error);
+		return error;
+	}
+
+	if (!result)
+		return -EACCES;
+	return 0;
+}
+
+/**
+ * rpcb_register - set or unset a port registration with the local rpcbind svc
+ * @net: target network namespace
+ * @prog: RPC program number to bind
+ * @vers: RPC version number to bind
+ * @prot: transport protocol to register
+ * @port: port value to register
+ *
+ * Returns zero if the registration request was dispatched successfully
+ * and the rpcbind daemon returned success.  Otherwise, returns an errno
+ * value that reflects the nature of the error (request could not be
+ * dispatched, timed out, or rpcbind returned an error).
+ *
+ * RPC services invoke this function to advertise their contact
+ * information via the system's rpcbind daemon.  RPC services
+ * invoke this function once for each [program, version, transport]
+ * tuple they wish to advertise.
+ *
+ * Callers may also unregister RPC services that are no longer
+ * available by setting the passed-in port to zero.  This removes
+ * all registered transports for [program, version] from the local
+ * rpcbind database.
+ *
+ * This function uses rpcbind protocol version 2 to contact the
+ * local rpcbind daemon.
+ *
+ * Registration works over both AF_INET and AF_INET6, and services
+ * registered via this function are advertised as available for any
+ * address.  If the local rpcbind daemon is listening on AF_INET6,
+ * services registered via this function will be advertised on
+ * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
+ * addresses).
+ */
+int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
+{
+	struct rpcbind_args map = {
+		.r_prog		= prog,
+		.r_vers		= vers,
+		.r_prot		= prot,
+		.r_port		= port,
+	};
+	struct rpc_message msg = {
+		.rpc_argp	= &map,
+	};
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	bool is_set = false;
+
+	dprintk("RPC:       %sregistering (%u, %u, %d, %u) with local "
+			"rpcbind\n", (port ? "" : "un"),
+			prog, vers, prot, port);
+
+	msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
+	if (port != 0) {
+		msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
+		is_set = true;
+	}
+
+	return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
+}
+
+/*
+ * Fill in AF_INET family-specific arguments to register
+ */
+static int rpcb_register_inet4(struct sunrpc_net *sn,
+			       const struct sockaddr *sap,
+			       struct rpc_message *msg)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+	struct rpcbind_args *map = msg->rpc_argp;
+	unsigned short port = ntohs(sin->sin_port);
+	bool is_set = false;
+	int result;
+
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
+
+	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
+		"local rpcbind\n", (port ? "" : "un"),
+			map->r_prog, map->r_vers,
+			map->r_addr, map->r_netid);
+
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+	if (port != 0) {
+		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
+		is_set = true;
+	}
+
+	result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
+	kfree(map->r_addr);
+	return result;
+}
+
+/*
+ * Fill in AF_INET6 family-specific arguments to register
+ */
+static int rpcb_register_inet6(struct sunrpc_net *sn,
+			       const struct sockaddr *sap,
+			       struct rpc_message *msg)
+{
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
+	struct rpcbind_args *map = msg->rpc_argp;
+	unsigned short port = ntohs(sin6->sin6_port);
+	bool is_set = false;
+	int result;
+
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
+
+	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
+		"local rpcbind\n", (port ? "" : "un"),
+			map->r_prog, map->r_vers,
+			map->r_addr, map->r_netid);
+
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+	if (port != 0) {
+		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
+		is_set = true;
+	}
+
+	result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
+	kfree(map->r_addr);
+	return result;
+}
+
+static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
+					     struct rpc_message *msg)
+{
+	struct rpcbind_args *map = msg->rpc_argp;
+
+	dprintk("RPC:       unregistering [%u, %u, '%s'] with "
+		"local rpcbind\n",
+			map->r_prog, map->r_vers, map->r_netid);
+
+	map->r_addr = "";
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+
+	return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
+}
+
+/**
+ * rpcb_v4_register - set or unset a port registration with the local rpcbind
+ * @net: target network namespace
+ * @program: RPC program number of service to (un)register
+ * @version: RPC version number of service to (un)register
+ * @address: address family, IP address, and port to (un)register
+ * @netid: netid of transport protocol to (un)register
+ *
+ * Returns zero if the registration request was dispatched successfully
+ * and the rpcbind daemon returned success.  Otherwise, returns an errno
+ * value that reflects the nature of the error (request could not be
+ * dispatched, timed out, or rpcbind returned an error).
+ *
+ * RPC services invoke this function to advertise their contact
+ * information via the system's rpcbind daemon.  RPC services
+ * invoke this function once for each [program, version, address,
+ * netid] tuple they wish to advertise.
+ *
+ * Callers may also unregister RPC services that are registered at a
+ * specific address by setting the port number in @address to zero.
+ * They may unregister all registered protocol families at once for
+ * a service by passing a NULL @address argument.  If @netid is ""
+ * then all netids for [program, version, address] are unregistered.
+ *
+ * This function uses rpcbind protocol version 4 to contact the
+ * local rpcbind daemon.  The local rpcbind daemon must support
+ * version 4 of the rpcbind protocol in order for these functions
+ * to register a service successfully.
+ *
+ * Supported netids include "udp" and "tcp" for UDP and TCP over
+ * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
+ * respectively.
+ *
+ * The contents of @address determine the address family and the
+ * port to be registered.  The usual practice is to pass INADDR_ANY
+ * as the raw address, but specifying a non-zero address is also
+ * supported by this API if the caller wishes to advertise an RPC
+ * service on a specific network interface.
+ *
+ * Note that passing in INADDR_ANY does not create the same service
+ * registration as IN6ADDR_ANY.  The former advertises an RPC
+ * service on any IPv4 address, but not on IPv6.  The latter
+ * advertises the service on all IPv4 and IPv6 addresses.
+ */
+int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
+		     const struct sockaddr *address, const char *netid)
+{
+	struct rpcbind_args map = {
+		.r_prog		= program,
+		.r_vers		= version,
+		.r_netid	= netid,
+		.r_owner	= RPCB_OWNER_STRING,
+	};
+	struct rpc_message msg = {
+		.rpc_argp	= &map,
+	};
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	if (sn->rpcb_local_clnt4 == NULL)
+		return -EPROTONOSUPPORT;
+
+	if (address == NULL)
+		return rpcb_unregister_all_protofamilies(sn, &msg);
+
+	switch (address->sa_family) {
+	case AF_INET:
+		return rpcb_register_inet4(sn, address, &msg);
+	case AF_INET6:
+		return rpcb_register_inet6(sn, address, &msg);
+	}
+
+	return -EAFNOSUPPORT;
+}
+
+static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
+{
+	struct rpc_message msg = {
+		.rpc_proc = proc,
+		.rpc_argp = map,
+		.rpc_resp = map,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = rpcb_clnt,
+		.rpc_message = &msg,
+		.callback_ops = &rpcb_getport_ops,
+		.callback_data = map,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
+	};
+
+	return rpc_run_task(&task_setup_data);
+}
+
+/*
+ * In the case where rpc clients have been cloned, we want to make
+ * sure that we use the program number/version etc of the actual
+ * owner of the xprt. To do so, we walk back up the tree of parents
+ * to find whoever created the transport and/or whoever has the
+ * autobind flag set.
+ */
+static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
+{
+	struct rpc_clnt *parent = clnt->cl_parent;
+	struct rpc_xprt *xprt = rcu_dereference(clnt->cl_xprt);
+
+	while (parent != clnt) {
+		if (rcu_dereference(parent->cl_xprt) != xprt)
+			break;
+		if (clnt->cl_autobind)
+			break;
+		clnt = parent;
+		parent = parent->cl_parent;
+	}
+	return clnt;
+}
+
+/**
+ * rpcb_getport_async - obtain the port for a given RPC service on a given host
+ * @task: task that is waiting for portmapper request
+ *
+ * This one can be called for an ongoing RPC request, and can be used in
+ * an async (rpciod) context.
+ */
+void rpcb_getport_async(struct rpc_task *task)
+{
+	struct rpc_clnt *clnt;
+	struct rpc_procinfo *proc;
+	u32 bind_version;
+	struct rpc_xprt *xprt;
+	struct rpc_clnt	*rpcb_clnt;
+	struct rpcbind_args *map;
+	struct rpc_task	*child;
+	struct sockaddr_storage addr;
+	struct sockaddr *sap = (struct sockaddr *)&addr;
+	size_t salen;
+	int status;
+
+	rcu_read_lock();
+	do {
+		clnt = rpcb_find_transport_owner(task->tk_client);
+		xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+	} while (xprt == NULL);
+	rcu_read_unlock();
+
+	dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
+		task->tk_pid, __func__,
+		xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
+
+	/* Put self on the wait queue to ensure we get notified if
+	 * some other task is already attempting to bind the port */
+	rpc_sleep_on(&xprt->binding, task, NULL);
+
+	if (xprt_test_and_set_binding(xprt)) {
+		dprintk("RPC: %5u %s: waiting for another binder\n",
+			task->tk_pid, __func__);
+		xprt_put(xprt);
+		return;
+	}
+
+	/* Someone else may have bound if we slept */
+	if (xprt_bound(xprt)) {
+		status = 0;
+		dprintk("RPC: %5u %s: already bound\n",
+			task->tk_pid, __func__);
+		goto bailout_nofree;
+	}
+
+	/* Parent transport's destination address */
+	salen = rpc_peeraddr(clnt, sap, sizeof(addr));
+
+	/* Don't ever use rpcbind v2 for AF_INET6 requests */
+	switch (sap->sa_family) {
+	case AF_INET:
+		proc = rpcb_next_version[xprt->bind_index].rpc_proc;
+		bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
+		break;
+	case AF_INET6:
+		proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
+		bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
+		break;
+	default:
+		status = -EAFNOSUPPORT;
+		dprintk("RPC: %5u %s: bad address family\n",
+				task->tk_pid, __func__);
+		goto bailout_nofree;
+	}
+	if (proc == NULL) {
+		xprt->bind_index = 0;
+		status = -EPFNOSUPPORT;
+		dprintk("RPC: %5u %s: no more getport versions available\n",
+			task->tk_pid, __func__);
+		goto bailout_nofree;
+	}
+
+	dprintk("RPC: %5u %s: trying rpcbind version %u\n",
+		task->tk_pid, __func__, bind_version);
+
+	rpcb_clnt = rpcb_create(xprt->xprt_net,
+				clnt->cl_nodename,
+				xprt->servername, sap, salen,
+				xprt->prot, bind_version);
+	if (IS_ERR(rpcb_clnt)) {
+		status = PTR_ERR(rpcb_clnt);
+		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
+			task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
+		goto bailout_nofree;
+	}
+
+	map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
+	if (!map) {
+		status = -ENOMEM;
+		dprintk("RPC: %5u %s: no memory available\n",
+			task->tk_pid, __func__);
+		goto bailout_release_client;
+	}
+	map->r_prog = clnt->cl_prog;
+	map->r_vers = clnt->cl_vers;
+	map->r_prot = xprt->prot;
+	map->r_port = 0;
+	map->r_xprt = xprt;
+	map->r_status = -EIO;
+
+	switch (bind_version) {
+	case RPCBVERS_4:
+	case RPCBVERS_3:
+		map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
+		map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
+		map->r_owner = "";
+		break;
+	case RPCBVERS_2:
+		map->r_addr = NULL;
+		break;
+	default:
+		BUG();
+	}
+
+	child = rpcb_call_async(rpcb_clnt, map, proc);
+	rpc_release_client(rpcb_clnt);
+	if (IS_ERR(child)) {
+		/* rpcb_map_release() has freed the arguments */
+		dprintk("RPC: %5u %s: rpc_run_task failed\n",
+			task->tk_pid, __func__);
+		return;
+	}
+
+	xprt->stat.bind_count++;
+	rpc_put_task(child);
+	return;
+
+bailout_release_client:
+	rpc_release_client(rpcb_clnt);
+bailout_nofree:
+	rpcb_wake_rpcbind_waiters(xprt, status);
+	task->tk_status = status;
+	xprt_put(xprt);
+}
+EXPORT_SYMBOL_GPL(rpcb_getport_async);
+
+/*
+ * Rpcbind child task calls this callback via tk_exit.
+ */
+static void rpcb_getport_done(struct rpc_task *child, void *data)
+{
+	struct rpcbind_args *map = data;
+	struct rpc_xprt *xprt = map->r_xprt;
+	int status = child->tk_status;
+
+	/* Garbage reply: retry with a lesser rpcbind version */
+	if (status == -EIO)
+		status = -EPROTONOSUPPORT;
+
+	/* rpcbind server doesn't support this rpcbind protocol version */
+	if (status == -EPROTONOSUPPORT)
+		xprt->bind_index++;
+
+	if (status < 0) {
+		/* rpcbind server not available on remote host? */
+		xprt->ops->set_port(xprt, 0);
+	} else if (map->r_port == 0) {
+		/* Requested RPC service wasn't registered on remote host */
+		xprt->ops->set_port(xprt, 0);
+		status = -EACCES;
+	} else {
+		/* Succeeded */
+		xprt->ops->set_port(xprt, map->r_port);
+		xprt_set_bound(xprt);
+		status = 0;
+	}
+
+	dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
+			child->tk_pid, status, map->r_port);
+
+	map->r_status = status;
+}
+
+/*
+ * XDR functions for rpcbind
+ */
+
+static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
+			     const struct rpcbind_args *rpcb)
+{
+	__be32 *p;
+
+	dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
+			req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name,
+			rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
+
+	p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
+	*p++ = cpu_to_be32(rpcb->r_prog);
+	*p++ = cpu_to_be32(rpcb->r_vers);
+	*p++ = cpu_to_be32(rpcb->r_prot);
+	*p   = cpu_to_be32(rpcb->r_port);
+}
+
+static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
+			    struct rpcbind_args *rpcb)
+{
+	unsigned long port;
+	__be32 *p;
+
+	rpcb->r_port = 0;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -EIO;
+
+	port = be32_to_cpup(p);
+	dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name, port);
+	if (unlikely(port > USHRT_MAX))
+		return -EIO;
+
+	rpcb->r_port = port;
+	return 0;
+}
+
+static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
+			unsigned int *boolp)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		return -EIO;
+
+	*boolp = 0;
+	if (*p != xdr_zero)
+		*boolp = 1;
+
+	dprintk("RPC: %5u RPCB_%s call %s\n",
+			req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name,
+			(*boolp ? "succeeded" : "failed"));
+	return 0;
+}
+
+static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
+			       const u32 maxstrlen)
+{
+	__be32 *p;
+	u32 len;
+
+	len = strlen(string);
+	WARN_ON_ONCE(len > maxstrlen);
+	if (len > maxstrlen)
+		/* truncate and hope for the best */
+		len = maxstrlen;
+	p = xdr_reserve_space(xdr, 4 + len);
+	xdr_encode_opaque(p, string, len);
+}
+
+static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
+			     const struct rpcbind_args *rpcb)
+{
+	__be32 *p;
+
+	dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
+			req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name,
+			rpcb->r_prog, rpcb->r_vers,
+			rpcb->r_netid, rpcb->r_addr);
+
+	p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
+	*p++ = cpu_to_be32(rpcb->r_prog);
+	*p = cpu_to_be32(rpcb->r_vers);
+
+	encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
+	encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
+	encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
+}
+
+static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
+			    struct rpcbind_args *rpcb)
+{
+	struct sockaddr_storage address;
+	struct sockaddr *sap = (struct sockaddr *)&address;
+	__be32 *p;
+	u32 len;
+
+	rpcb->r_port = 0;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_fail;
+	len = be32_to_cpup(p);
+
+	/*
+	 * If the returned universal address is a null string,
+	 * the requested RPC service was not registered.
+	 */
+	if (len == 0) {
+		dprintk("RPC: %5u RPCB reply: program not registered\n",
+				req->rq_task->tk_pid);
+		return 0;
+	}
+
+	if (unlikely(len > RPCBIND_MAXUADDRLEN))
+		goto out_fail;
+
+	p = xdr_inline_decode(xdr, len);
+	if (unlikely(p == NULL))
+		goto out_fail;
+	dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
+
+	if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
+				sap, sizeof(address)) == 0)
+		goto out_fail;
+	rpcb->r_port = rpc_get_port(sap);
+
+	return 0;
+
+out_fail:
+	dprintk("RPC: %5u malformed RPCB_%s reply\n",
+			req->rq_task->tk_pid,
+			req->rq_task->tk_msg.rpc_proc->p_name);
+	return -EIO;
+}
+
+/*
+ * Not all rpcbind procedures described in RFC 1833 are implemented
+ * since the Linux kernel RPC code requires only these.
+ */
+
+static struct rpc_procinfo rpcb_procedures2[] = {
+	[RPCBPROC_SET] = {
+		.p_proc		= RPCBPROC_SET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_mapping,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_mappingargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_SET,
+		.p_timer	= 0,
+		.p_name		= "SET",
+	},
+	[RPCBPROC_UNSET] = {
+		.p_proc		= RPCBPROC_UNSET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_mapping,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_mappingargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_UNSET,
+		.p_timer	= 0,
+		.p_name		= "UNSET",
+	},
+	[RPCBPROC_GETPORT] = {
+		.p_proc		= RPCBPROC_GETPORT,
+		.p_encode	= (kxdreproc_t)rpcb_enc_mapping,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_getport,
+		.p_arglen	= RPCB_mappingargs_sz,
+		.p_replen	= RPCB_getportres_sz,
+		.p_statidx	= RPCBPROC_GETPORT,
+		.p_timer	= 0,
+		.p_name		= "GETPORT",
+	},
+};
+
+static struct rpc_procinfo rpcb_procedures3[] = {
+	[RPCBPROC_SET] = {
+		.p_proc		= RPCBPROC_SET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_SET,
+		.p_timer	= 0,
+		.p_name		= "SET",
+	},
+	[RPCBPROC_UNSET] = {
+		.p_proc		= RPCBPROC_UNSET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_UNSET,
+		.p_timer	= 0,
+		.p_name		= "UNSET",
+	},
+	[RPCBPROC_GETADDR] = {
+		.p_proc		= RPCBPROC_GETADDR,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_getaddr,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_getaddrres_sz,
+		.p_statidx	= RPCBPROC_GETADDR,
+		.p_timer	= 0,
+		.p_name		= "GETADDR",
+	},
+};
+
+static struct rpc_procinfo rpcb_procedures4[] = {
+	[RPCBPROC_SET] = {
+		.p_proc		= RPCBPROC_SET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_SET,
+		.p_timer	= 0,
+		.p_name		= "SET",
+	},
+	[RPCBPROC_UNSET] = {
+		.p_proc		= RPCBPROC_UNSET,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_set,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_setres_sz,
+		.p_statidx	= RPCBPROC_UNSET,
+		.p_timer	= 0,
+		.p_name		= "UNSET",
+	},
+	[RPCBPROC_GETADDR] = {
+		.p_proc		= RPCBPROC_GETADDR,
+		.p_encode	= (kxdreproc_t)rpcb_enc_getaddr,
+		.p_decode	= (kxdrdproc_t)rpcb_dec_getaddr,
+		.p_arglen	= RPCB_getaddrargs_sz,
+		.p_replen	= RPCB_getaddrres_sz,
+		.p_statidx	= RPCBPROC_GETADDR,
+		.p_timer	= 0,
+		.p_name		= "GETADDR",
+	},
+};
+
+static const struct rpcb_info rpcb_next_version[] = {
+	{
+		.rpc_vers	= RPCBVERS_2,
+		.rpc_proc	= &rpcb_procedures2[RPCBPROC_GETPORT],
+	},
+	{
+		.rpc_proc	= NULL,
+	},
+};
+
+static const struct rpcb_info rpcb_next_version6[] = {
+	{
+		.rpc_vers	= RPCBVERS_4,
+		.rpc_proc	= &rpcb_procedures4[RPCBPROC_GETADDR],
+	},
+	{
+		.rpc_vers	= RPCBVERS_3,
+		.rpc_proc	= &rpcb_procedures3[RPCBPROC_GETADDR],
+	},
+	{
+		.rpc_proc	= NULL,
+	},
+};
+
+static const struct rpc_version rpcb_version2 = {
+	.number		= RPCBVERS_2,
+	.nrprocs	= ARRAY_SIZE(rpcb_procedures2),
+	.procs		= rpcb_procedures2
+};
+
+static const struct rpc_version rpcb_version3 = {
+	.number		= RPCBVERS_3,
+	.nrprocs	= ARRAY_SIZE(rpcb_procedures3),
+	.procs		= rpcb_procedures3
+};
+
+static const struct rpc_version rpcb_version4 = {
+	.number		= RPCBVERS_4,
+	.nrprocs	= ARRAY_SIZE(rpcb_procedures4),
+	.procs		= rpcb_procedures4
+};
+
+static const struct rpc_version *rpcb_version[] = {
+	NULL,
+	NULL,
+	&rpcb_version2,
+	&rpcb_version3,
+	&rpcb_version4
+};
+
+static struct rpc_stat rpcb_stats;
+
+static const struct rpc_program rpcb_program = {
+	.name		= "rpcbind",
+	.number		= RPCBIND_PROGRAM,
+	.nrvers		= ARRAY_SIZE(rpcb_version),
+	.version	= rpcb_version,
+	.stats		= &rpcb_stats,
+};
diff --git a/kernel/net/sunrpc/sched.c b/kernel/net/sunrpc/sched.c
new file mode 100644
index 000000000..337ca851a
--- /dev/null
+++ b/kernel/net/sunrpc/sched.c
@@ -0,0 +1,1141 @@
+/*
+ * linux/net/sunrpc/sched.c
+ *
+ * Scheduling for synchronous and asynchronous RPC requests.
+ *
+ * Copyright (C) 1996 Olaf Kirch, <okir@monad.swb.de>
+ *
+ * TCP NFS related read + write fixes
+ * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
+ */
+
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/mempool.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/freezer.h>
+
+#include <linux/sunrpc/clnt.h>
+
+#include "sunrpc.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+#define RPCDBG_FACILITY		RPCDBG_SCHED
+#endif
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/sunrpc.h>
+
+/*
+ * RPC slabs and memory pools
+ */
+#define RPC_BUFFER_MAXSIZE	(2048)
+#define RPC_BUFFER_POOLSIZE	(8)
+#define RPC_TASK_POOLSIZE	(8)
+static struct kmem_cache	*rpc_task_slabp __read_mostly;
+static struct kmem_cache	*rpc_buffer_slabp __read_mostly;
+static mempool_t	*rpc_task_mempool __read_mostly;
+static mempool_t	*rpc_buffer_mempool __read_mostly;
+
+static void			rpc_async_schedule(struct work_struct *);
+static void			 rpc_release_task(struct rpc_task *task);
+static void __rpc_queue_timer_fn(unsigned long ptr);
+
+/*
+ * RPC tasks sit here while waiting for conditions to improve.
+ */
+static struct rpc_wait_queue delay_queue;
+
+/*
+ * rpciod-related stuff
+ */
+struct workqueue_struct *rpciod_workqueue;
+
+/*
+ * Disable the timer for a given RPC task. Should be called with
+ * queue->lock and bh_disabled in order to avoid races within
+ * rpc_run_timer().
+ */
+static void
+__rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	if (task->tk_timeout == 0)
+		return;
+	dprintk("RPC: %5u disabling timer\n", task->tk_pid);
+	task->tk_timeout = 0;
+	list_del(&task->u.tk_wait.timer_list);
+	if (list_empty(&queue->timer_list.list))
+		del_timer(&queue->timer_list.timer);
+}
+
+static void
+rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires)
+{
+	queue->timer_list.expires = expires;
+	mod_timer(&queue->timer_list.timer, expires);
+}
+
+/*
+ * Set up a timer for the current task.
+ */
+static void
+__rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	if (!task->tk_timeout)
+		return;
+
+	dprintk("RPC: %5u setting alarm for %u ms\n",
+		task->tk_pid, jiffies_to_msecs(task->tk_timeout));
+
+	task->u.tk_wait.expires = jiffies + task->tk_timeout;
+	if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires))
+		rpc_set_queue_timer(queue, task->u.tk_wait.expires);
+	list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list);
+}
+
+static void rpc_rotate_queue_owner(struct rpc_wait_queue *queue)
+{
+	struct list_head *q = &queue->tasks[queue->priority];
+	struct rpc_task *task;
+
+	if (!list_empty(q)) {
+		task = list_first_entry(q, struct rpc_task, u.tk_wait.list);
+		if (task->tk_owner == queue->owner)
+			list_move_tail(&task->u.tk_wait.list, q);
+	}
+}
+
+static void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority)
+{
+	if (queue->priority != priority) {
+		/* Fairness: rotate the list when changing priority */
+		rpc_rotate_queue_owner(queue);
+		queue->priority = priority;
+	}
+}
+
+static void rpc_set_waitqueue_owner(struct rpc_wait_queue *queue, pid_t pid)
+{
+	queue->owner = pid;
+	queue->nr = RPC_BATCH_COUNT;
+}
+
+static void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue)
+{
+	rpc_set_waitqueue_priority(queue, queue->maxpriority);
+	rpc_set_waitqueue_owner(queue, 0);
+}
+
+/*
+ * Add new request to a priority queue.
+ */
+static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue,
+		struct rpc_task *task,
+		unsigned char queue_priority)
+{
+	struct list_head *q;
+	struct rpc_task *t;
+
+	INIT_LIST_HEAD(&task->u.tk_wait.links);
+	if (unlikely(queue_priority > queue->maxpriority))
+		queue_priority = queue->maxpriority;
+	if (queue_priority > queue->priority)
+		rpc_set_waitqueue_priority(queue, queue_priority);
+	q = &queue->tasks[queue_priority];
+	list_for_each_entry(t, q, u.tk_wait.list) {
+		if (t->tk_owner == task->tk_owner) {
+			list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links);
+			return;
+		}
+	}
+	list_add_tail(&task->u.tk_wait.list, q);
+}
+
+/*
+ * Add new request to wait queue.
+ *
+ * Swapper tasks always get inserted at the head of the queue.
+ * This should avoid many nasty memory deadlocks and hopefully
+ * improve overall performance.
+ * Everyone else gets appended to the queue to ensure proper FIFO behavior.
+ */
+static void __rpc_add_wait_queue(struct rpc_wait_queue *queue,
+		struct rpc_task *task,
+		unsigned char queue_priority)
+{
+	WARN_ON_ONCE(RPC_IS_QUEUED(task));
+	if (RPC_IS_QUEUED(task))
+		return;
+
+	if (RPC_IS_PRIORITY(queue))
+		__rpc_add_wait_queue_priority(queue, task, queue_priority);
+	else if (RPC_IS_SWAPPER(task))
+		list_add(&task->u.tk_wait.list, &queue->tasks[0]);
+	else
+		list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]);
+	task->tk_waitqueue = queue;
+	queue->qlen++;
+	/* barrier matches the read in rpc_wake_up_task_queue_locked() */
+	smp_wmb();
+	rpc_set_queued(task);
+
+	dprintk("RPC: %5u added to queue %p \"%s\"\n",
+			task->tk_pid, queue, rpc_qname(queue));
+}
+
+/*
+ * Remove request from a priority queue.
+ */
+static void __rpc_remove_wait_queue_priority(struct rpc_task *task)
+{
+	struct rpc_task *t;
+
+	if (!list_empty(&task->u.tk_wait.links)) {
+		t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list);
+		list_move(&t->u.tk_wait.list, &task->u.tk_wait.list);
+		list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links);
+	}
+}
+
+/*
+ * Remove request from queue.
+ * Note: must be called with spin lock held.
+ */
+static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	__rpc_disable_timer(queue, task);
+	if (RPC_IS_PRIORITY(queue))
+		__rpc_remove_wait_queue_priority(task);
+	list_del(&task->u.tk_wait.list);
+	queue->qlen--;
+	dprintk("RPC: %5u removed from queue %p \"%s\"\n",
+			task->tk_pid, queue, rpc_qname(queue));
+}
+
+static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname, unsigned char nr_queues)
+{
+	int i;
+
+	spin_lock_init(&queue->lock);
+	for (i = 0; i < ARRAY_SIZE(queue->tasks); i++)
+		INIT_LIST_HEAD(&queue->tasks[i]);
+	queue->maxpriority = nr_queues - 1;
+	rpc_reset_waitqueue_priority(queue);
+	queue->qlen = 0;
+	setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue);
+	INIT_LIST_HEAD(&queue->timer_list.list);
+	rpc_assign_waitqueue_name(queue, qname);
+}
+
+void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname)
+{
+	__rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY);
+}
+EXPORT_SYMBOL_GPL(rpc_init_priority_wait_queue);
+
+void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname)
+{
+	__rpc_init_priority_wait_queue(queue, qname, 1);
+}
+EXPORT_SYMBOL_GPL(rpc_init_wait_queue);
+
+void rpc_destroy_wait_queue(struct rpc_wait_queue *queue)
+{
+	del_timer_sync(&queue->timer_list.timer);
+}
+EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue);
+
+static int rpc_wait_bit_killable(struct wait_bit_key *key)
+{
+	if (fatal_signal_pending(current))
+		return -ERESTARTSYS;
+	freezable_schedule_unsafe();
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+static void rpc_task_set_debuginfo(struct rpc_task *task)
+{
+	static atomic_t rpc_pid;
+
+	task->tk_pid = atomic_inc_return(&rpc_pid);
+}
+#else
+static inline void rpc_task_set_debuginfo(struct rpc_task *task)
+{
+}
+#endif
+
+static void rpc_set_active(struct rpc_task *task)
+{
+	trace_rpc_task_begin(task->tk_client, task, NULL);
+
+	rpc_task_set_debuginfo(task);
+	set_bit(RPC_TASK_ACTIVE, &task->tk_runstate);
+}
+
+/*
+ * Mark an RPC call as having completed by clearing the 'active' bit
+ * and then waking up all tasks that were sleeping.
+ */
+static int rpc_complete_task(struct rpc_task *task)
+{
+	void *m = &task->tk_runstate;
+	wait_queue_head_t *wq = bit_waitqueue(m, RPC_TASK_ACTIVE);
+	struct wait_bit_key k = __WAIT_BIT_KEY_INITIALIZER(m, RPC_TASK_ACTIVE);
+	unsigned long flags;
+	int ret;
+
+	trace_rpc_task_complete(task->tk_client, task, NULL);
+
+	spin_lock_irqsave(&wq->lock, flags);
+	clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate);
+	ret = atomic_dec_and_test(&task->tk_count);
+	if (waitqueue_active(wq))
+		__wake_up_locked_key(wq, TASK_NORMAL, &k);
+	spin_unlock_irqrestore(&wq->lock, flags);
+	return ret;
+}
+
+/*
+ * Allow callers to wait for completion of an RPC call
+ *
+ * Note the use of out_of_line_wait_on_bit() rather than wait_on_bit()
+ * to enforce taking of the wq->lock and hence avoid races with
+ * rpc_complete_task().
+ */
+int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *action)
+{
+	if (action == NULL)
+		action = rpc_wait_bit_killable;
+	return out_of_line_wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE,
+			action, TASK_KILLABLE);
+}
+EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task);
+
+/*
+ * Make an RPC task runnable.
+ *
+ * Note: If the task is ASYNC, and is being made runnable after sitting on an
+ * rpc_wait_queue, this must be called with the queue spinlock held to protect
+ * the wait queue operation.
+ * Note the ordering of rpc_test_and_set_running() and rpc_clear_queued(),
+ * which is needed to ensure that __rpc_execute() doesn't loop (due to the
+ * lockless RPC_IS_QUEUED() test) before we've had a chance to test
+ * the RPC_TASK_RUNNING flag.
+ */
+static void rpc_make_runnable(struct rpc_task *task)
+{
+	bool need_wakeup = !rpc_test_and_set_running(task);
+
+	rpc_clear_queued(task);
+	if (!need_wakeup)
+		return;
+	if (RPC_IS_ASYNC(task)) {
+		INIT_WORK(&task->u.tk_work, rpc_async_schedule);
+		queue_work(rpciod_workqueue, &task->u.tk_work);
+	} else
+		wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED);
+}
+
+/*
+ * Prepare for sleeping on a wait queue.
+ * By always appending tasks to the list we ensure FIFO behavior.
+ * NB: An RPC task will only receive interrupt-driven events as long
+ * as it's on a wait queue.
+ */
+static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
+		struct rpc_task *task,
+		rpc_action action,
+		unsigned char queue_priority)
+{
+	dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n",
+			task->tk_pid, rpc_qname(q), jiffies);
+
+	trace_rpc_task_sleep(task->tk_client, task, q);
+
+	__rpc_add_wait_queue(q, task, queue_priority);
+
+	WARN_ON_ONCE(task->tk_callback != NULL);
+	task->tk_callback = action;
+	__rpc_add_timer(q, task);
+}
+
+void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
+				rpc_action action)
+{
+	/* We shouldn't ever put an inactive task to sleep */
+	WARN_ON_ONCE(!RPC_IS_ACTIVATED(task));
+	if (!RPC_IS_ACTIVATED(task)) {
+		task->tk_status = -EIO;
+		rpc_put_task_async(task);
+		return;
+	}
+
+	/*
+	 * Protect the queue operations.
+	 */
+	spin_lock_bh(&q->lock);
+	__rpc_sleep_on_priority(q, task, action, task->tk_priority);
+	spin_unlock_bh(&q->lock);
+}
+EXPORT_SYMBOL_GPL(rpc_sleep_on);
+
+void rpc_sleep_on_priority(struct rpc_wait_queue *q, struct rpc_task *task,
+		rpc_action action, int priority)
+{
+	/* We shouldn't ever put an inactive task to sleep */
+	WARN_ON_ONCE(!RPC_IS_ACTIVATED(task));
+	if (!RPC_IS_ACTIVATED(task)) {
+		task->tk_status = -EIO;
+		rpc_put_task_async(task);
+		return;
+	}
+
+	/*
+	 * Protect the queue operations.
+	 */
+	spin_lock_bh(&q->lock);
+	__rpc_sleep_on_priority(q, task, action, priority - RPC_PRIORITY_LOW);
+	spin_unlock_bh(&q->lock);
+}
+EXPORT_SYMBOL_GPL(rpc_sleep_on_priority);
+
+/**
+ * __rpc_do_wake_up_task - wake up a single rpc_task
+ * @queue: wait queue
+ * @task: task to be woken up
+ *
+ * Caller must hold queue->lock, and have cleared the task queued flag.
+ */
+static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n",
+			task->tk_pid, jiffies);
+
+	/* Has the task been executed yet? If not, we cannot wake it up! */
+	if (!RPC_IS_ACTIVATED(task)) {
+		printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task);
+		return;
+	}
+
+	trace_rpc_task_wakeup(task->tk_client, task, queue);
+
+	__rpc_remove_wait_queue(queue, task);
+
+	rpc_make_runnable(task);
+
+	dprintk("RPC:       __rpc_wake_up_task done\n");
+}
+
+/*
+ * Wake up a queued task while the queue lock is being held
+ */
+static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	if (RPC_IS_QUEUED(task)) {
+		smp_rmb();
+		if (task->tk_waitqueue == queue)
+			__rpc_do_wake_up_task(queue, task);
+	}
+}
+
+/*
+ * Wake up a task on a specific queue
+ */
+void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task)
+{
+	spin_lock_bh(&queue->lock);
+	rpc_wake_up_task_queue_locked(queue, task);
+	spin_unlock_bh(&queue->lock);
+}
+EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task);
+
+/*
+ * Wake up the next task on a priority queue.
+ */
+static struct rpc_task *__rpc_find_next_queued_priority(struct rpc_wait_queue *queue)
+{
+	struct list_head *q;
+	struct rpc_task *task;
+
+	/*
+	 * Service a batch of tasks from a single owner.
+	 */
+	q = &queue->tasks[queue->priority];
+	if (!list_empty(q)) {
+		task = list_entry(q->next, struct rpc_task, u.tk_wait.list);
+		if (queue->owner == task->tk_owner) {
+			if (--queue->nr)
+				goto out;
+			list_move_tail(&task->u.tk_wait.list, q);
+		}
+		/*
+		 * Check if we need to switch queues.
+		 */
+		goto new_owner;
+	}
+
+	/*
+	 * Service the next queue.
+	 */
+	do {
+		if (q == &queue->tasks[0])
+			q = &queue->tasks[queue->maxpriority];
+		else
+			q = q - 1;
+		if (!list_empty(q)) {
+			task = list_entry(q->next, struct rpc_task, u.tk_wait.list);
+			goto new_queue;
+		}
+	} while (q != &queue->tasks[queue->priority]);
+
+	rpc_reset_waitqueue_priority(queue);
+	return NULL;
+
+new_queue:
+	rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0]));
+new_owner:
+	rpc_set_waitqueue_owner(queue, task->tk_owner);
+out:
+	return task;
+}
+
+static struct rpc_task *__rpc_find_next_queued(struct rpc_wait_queue *queue)
+{
+	if (RPC_IS_PRIORITY(queue))
+		return __rpc_find_next_queued_priority(queue);
+	if (!list_empty(&queue->tasks[0]))
+		return list_first_entry(&queue->tasks[0], struct rpc_task, u.tk_wait.list);
+	return NULL;
+}
+
+/*
+ * Wake up the first task on the wait queue.
+ */
+struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *queue,
+		bool (*func)(struct rpc_task *, void *), void *data)
+{
+	struct rpc_task	*task = NULL;
+
+	dprintk("RPC:       wake_up_first(%p \"%s\")\n",
+			queue, rpc_qname(queue));
+	spin_lock_bh(&queue->lock);
+	task = __rpc_find_next_queued(queue);
+	if (task != NULL) {
+		if (func(task, data))
+			rpc_wake_up_task_queue_locked(queue, task);
+		else
+			task = NULL;
+	}
+	spin_unlock_bh(&queue->lock);
+
+	return task;
+}
+EXPORT_SYMBOL_GPL(rpc_wake_up_first);
+
+static bool rpc_wake_up_next_func(struct rpc_task *task, void *data)
+{
+	return true;
+}
+
+/*
+ * Wake up the next task on the wait queue.
+*/
+struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *queue)
+{
+	return rpc_wake_up_first(queue, rpc_wake_up_next_func, NULL);
+}
+EXPORT_SYMBOL_GPL(rpc_wake_up_next);
+
+/**
+ * rpc_wake_up - wake up all rpc_tasks
+ * @queue: rpc_wait_queue on which the tasks are sleeping
+ *
+ * Grabs queue->lock
+ */
+void rpc_wake_up(struct rpc_wait_queue *queue)
+{
+	struct list_head *head;
+
+	spin_lock_bh(&queue->lock);
+	head = &queue->tasks[queue->maxpriority];
+	for (;;) {
+		while (!list_empty(head)) {
+			struct rpc_task *task;
+			task = list_first_entry(head,
+					struct rpc_task,
+					u.tk_wait.list);
+			rpc_wake_up_task_queue_locked(queue, task);
+		}
+		if (head == &queue->tasks[0])
+			break;
+		head--;
+	}
+	spin_unlock_bh(&queue->lock);
+}
+EXPORT_SYMBOL_GPL(rpc_wake_up);
+
+/**
+ * rpc_wake_up_status - wake up all rpc_tasks and set their status value.
+ * @queue: rpc_wait_queue on which the tasks are sleeping
+ * @status: status value to set
+ *
+ * Grabs queue->lock
+ */
+void rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
+{
+	struct list_head *head;
+
+	spin_lock_bh(&queue->lock);
+	head = &queue->tasks[queue->maxpriority];
+	for (;;) {
+		while (!list_empty(head)) {
+			struct rpc_task *task;
+			task = list_first_entry(head,
+					struct rpc_task,
+					u.tk_wait.list);
+			task->tk_status = status;
+			rpc_wake_up_task_queue_locked(queue, task);
+		}
+		if (head == &queue->tasks[0])
+			break;
+		head--;
+	}
+	spin_unlock_bh(&queue->lock);
+}
+EXPORT_SYMBOL_GPL(rpc_wake_up_status);
+
+static void __rpc_queue_timer_fn(unsigned long ptr)
+{
+	struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr;
+	struct rpc_task *task, *n;
+	unsigned long expires, now, timeo;
+
+	spin_lock(&queue->lock);
+	expires = now = jiffies;
+	list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) {
+		timeo = task->u.tk_wait.expires;
+		if (time_after_eq(now, timeo)) {
+			dprintk("RPC: %5u timeout\n", task->tk_pid);
+			task->tk_status = -ETIMEDOUT;
+			rpc_wake_up_task_queue_locked(queue, task);
+			continue;
+		}
+		if (expires == now || time_after(expires, timeo))
+			expires = timeo;
+	}
+	if (!list_empty(&queue->timer_list.list))
+		rpc_set_queue_timer(queue, expires);
+	spin_unlock(&queue->lock);
+}
+
+static void __rpc_atrun(struct rpc_task *task)
+{
+	if (task->tk_status == -ETIMEDOUT)
+		task->tk_status = 0;
+}
+
+/*
+ * Run a task at a later time
+ */
+void rpc_delay(struct rpc_task *task, unsigned long delay)
+{
+	task->tk_timeout = delay;
+	rpc_sleep_on(&delay_queue, task, __rpc_atrun);
+}
+EXPORT_SYMBOL_GPL(rpc_delay);
+
+/*
+ * Helper to call task->tk_ops->rpc_call_prepare
+ */
+void rpc_prepare_task(struct rpc_task *task)
+{
+	task->tk_ops->rpc_call_prepare(task, task->tk_calldata);
+}
+
+static void
+rpc_init_task_statistics(struct rpc_task *task)
+{
+	/* Initialize retry counters */
+	task->tk_garb_retry = 2;
+	task->tk_cred_retry = 2;
+	task->tk_rebind_retry = 2;
+
+	/* starting timestamp */
+	task->tk_start = ktime_get();
+}
+
+static void
+rpc_reset_task_statistics(struct rpc_task *task)
+{
+	task->tk_timeouts = 0;
+	task->tk_flags &= ~(RPC_CALL_MAJORSEEN|RPC_TASK_KILLED|RPC_TASK_SENT);
+
+	rpc_init_task_statistics(task);
+}
+
+/*
+ * Helper that calls task->tk_ops->rpc_call_done if it exists
+ */
+void rpc_exit_task(struct rpc_task *task)
+{
+	task->tk_action = NULL;
+	if (task->tk_ops->rpc_call_done != NULL) {
+		task->tk_ops->rpc_call_done(task, task->tk_calldata);
+		if (task->tk_action != NULL) {
+			WARN_ON(RPC_ASSASSINATED(task));
+			/* Always release the RPC slot and buffer memory */
+			xprt_release(task);
+			rpc_reset_task_statistics(task);
+		}
+	}
+}
+
+void rpc_exit(struct rpc_task *task, int status)
+{
+	task->tk_status = status;
+	task->tk_action = rpc_exit_task;
+	if (RPC_IS_QUEUED(task))
+		rpc_wake_up_queued_task(task->tk_waitqueue, task);
+}
+EXPORT_SYMBOL_GPL(rpc_exit);
+
+void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata)
+{
+	if (ops->rpc_release != NULL)
+		ops->rpc_release(calldata);
+}
+
+/*
+ * This is the RPC `scheduler' (or rather, the finite state machine).
+ */
+static void __rpc_execute(struct rpc_task *task)
+{
+	struct rpc_wait_queue *queue;
+	int task_is_async = RPC_IS_ASYNC(task);
+	int status = 0;
+
+	dprintk("RPC: %5u __rpc_execute flags=0x%x\n",
+			task->tk_pid, task->tk_flags);
+
+	WARN_ON_ONCE(RPC_IS_QUEUED(task));
+	if (RPC_IS_QUEUED(task))
+		return;
+
+	for (;;) {
+		void (*do_action)(struct rpc_task *);
+
+		/*
+		 * Execute any pending callback first.
+		 */
+		do_action = task->tk_callback;
+		task->tk_callback = NULL;
+		if (do_action == NULL) {
+			/*
+			 * Perform the next FSM step.
+			 * tk_action may be NULL if the task has been killed.
+			 * In particular, note that rpc_killall_tasks may
+			 * do this at any time, so beware when dereferencing.
+			 */
+			do_action = task->tk_action;
+			if (do_action == NULL)
+				break;
+		}
+		trace_rpc_task_run_action(task->tk_client, task, task->tk_action);
+		do_action(task);
+
+		/*
+		 * Lockless check for whether task is sleeping or not.
+		 */
+		if (!RPC_IS_QUEUED(task))
+			continue;
+		/*
+		 * The queue->lock protects against races with
+		 * rpc_make_runnable().
+		 *
+		 * Note that once we clear RPC_TASK_RUNNING on an asynchronous
+		 * rpc_task, rpc_make_runnable() can assign it to a
+		 * different workqueue. We therefore cannot assume that the
+		 * rpc_task pointer may still be dereferenced.
+		 */
+		queue = task->tk_waitqueue;
+		spin_lock_bh(&queue->lock);
+		if (!RPC_IS_QUEUED(task)) {
+			spin_unlock_bh(&queue->lock);
+			continue;
+		}
+		rpc_clear_running(task);
+		spin_unlock_bh(&queue->lock);
+		if (task_is_async)
+			return;
+
+		/* sync task: sleep here */
+		dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid);
+		status = out_of_line_wait_on_bit(&task->tk_runstate,
+				RPC_TASK_QUEUED, rpc_wait_bit_killable,
+				TASK_KILLABLE);
+		if (status == -ERESTARTSYS) {
+			/*
+			 * When a sync task receives a signal, it exits with
+			 * -ERESTARTSYS. In order to catch any callbacks that
+			 * clean up after sleeping on some queue, we don't
+			 * break the loop here, but go around once more.
+			 */
+			dprintk("RPC: %5u got signal\n", task->tk_pid);
+			task->tk_flags |= RPC_TASK_KILLED;
+			rpc_exit(task, -ERESTARTSYS);
+		}
+		dprintk("RPC: %5u sync task resuming\n", task->tk_pid);
+	}
+
+	dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status,
+			task->tk_status);
+	/* Release all resources associated with the task */
+	rpc_release_task(task);
+}
+
+/*
+ * User-visible entry point to the scheduler.
+ *
+ * This may be called recursively if e.g. an async NFS task updates
+ * the attributes and finds that dirty pages must be flushed.
+ * NOTE: Upon exit of this function the task is guaranteed to be
+ *	 released. In particular note that tk_release() will have
+ *	 been called, so your task memory may have been freed.
+ */
+void rpc_execute(struct rpc_task *task)
+{
+	bool is_async = RPC_IS_ASYNC(task);
+
+	rpc_set_active(task);
+	rpc_make_runnable(task);
+	if (!is_async)
+		__rpc_execute(task);
+}
+
+static void rpc_async_schedule(struct work_struct *work)
+{
+	__rpc_execute(container_of(work, struct rpc_task, u.tk_work));
+}
+
+/**
+ * rpc_malloc - allocate an RPC buffer
+ * @task: RPC task that will use this buffer
+ * @size: requested byte size
+ *
+ * To prevent rpciod from hanging, this allocator never sleeps,
+ * returning NULL and suppressing warning if the request cannot be serviced
+ * immediately.
+ * The caller can arrange to sleep in a way that is safe for rpciod.
+ *
+ * Most requests are 'small' (under 2KiB) and can be serviced from a
+ * mempool, ensuring that NFS reads and writes can always proceed,
+ * and that there is good locality of reference for these buffers.
+ *
+ * In order to avoid memory starvation triggering more writebacks of
+ * NFS requests, we avoid using GFP_KERNEL.
+ */
+void *rpc_malloc(struct rpc_task *task, size_t size)
+{
+	struct rpc_buffer *buf;
+	gfp_t gfp = GFP_NOIO | __GFP_NOWARN;
+
+	if (RPC_IS_SWAPPER(task))
+		gfp = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
+
+	size += sizeof(struct rpc_buffer);
+	if (size <= RPC_BUFFER_MAXSIZE)
+		buf = mempool_alloc(rpc_buffer_mempool, gfp);
+	else
+		buf = kmalloc(size, gfp);
+
+	if (!buf)
+		return NULL;
+
+	buf->len = size;
+	dprintk("RPC: %5u allocated buffer of size %zu at %p\n",
+			task->tk_pid, size, buf);
+	return &buf->data;
+}
+EXPORT_SYMBOL_GPL(rpc_malloc);
+
+/**
+ * rpc_free - free buffer allocated via rpc_malloc
+ * @buffer: buffer to free
+ *
+ */
+void rpc_free(void *buffer)
+{
+	size_t size;
+	struct rpc_buffer *buf;
+
+	if (!buffer)
+		return;
+
+	buf = container_of(buffer, struct rpc_buffer, data);
+	size = buf->len;
+
+	dprintk("RPC:       freeing buffer of size %zu at %p\n",
+			size, buf);
+
+	if (size <= RPC_BUFFER_MAXSIZE)
+		mempool_free(buf, rpc_buffer_mempool);
+	else
+		kfree(buf);
+}
+EXPORT_SYMBOL_GPL(rpc_free);
+
+/*
+ * Creation and deletion of RPC task structures
+ */
+static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *task_setup_data)
+{
+	memset(task, 0, sizeof(*task));
+	atomic_set(&task->tk_count, 1);
+	task->tk_flags  = task_setup_data->flags;
+	task->tk_ops = task_setup_data->callback_ops;
+	task->tk_calldata = task_setup_data->callback_data;
+	INIT_LIST_HEAD(&task->tk_task);
+
+	task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW;
+	task->tk_owner = current->tgid;
+
+	/* Initialize workqueue for async tasks */
+	task->tk_workqueue = task_setup_data->workqueue;
+
+	if (task->tk_ops->rpc_call_prepare != NULL)
+		task->tk_action = rpc_prepare_task;
+
+	rpc_init_task_statistics(task);
+
+	dprintk("RPC:       new task initialized, procpid %u\n",
+				task_pid_nr(current));
+}
+
+static struct rpc_task *
+rpc_alloc_task(void)
+{
+	return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOIO);
+}
+
+/*
+ * Create a new task for the specified client.
+ */
+struct rpc_task *rpc_new_task(const struct rpc_task_setup *setup_data)
+{
+	struct rpc_task	*task = setup_data->task;
+	unsigned short flags = 0;
+
+	if (task == NULL) {
+		task = rpc_alloc_task();
+		if (task == NULL) {
+			rpc_release_calldata(setup_data->callback_ops,
+					setup_data->callback_data);
+			return ERR_PTR(-ENOMEM);
+		}
+		flags = RPC_TASK_DYNAMIC;
+	}
+
+	rpc_init_task(task, setup_data);
+	task->tk_flags |= flags;
+	dprintk("RPC:       allocated task %p\n", task);
+	return task;
+}
+
+/*
+ * rpc_free_task - release rpc task and perform cleanups
+ *
+ * Note that we free up the rpc_task _after_ rpc_release_calldata()
+ * in order to work around a workqueue dependency issue.
+ *
+ * Tejun Heo states:
+ * "Workqueue currently considers two work items to be the same if they're
+ * on the same address and won't execute them concurrently - ie. it
+ * makes a work item which is queued again while being executed wait
+ * for the previous execution to complete.
+ *
+ * If a work function frees the work item, and then waits for an event
+ * which should be performed by another work item and *that* work item
+ * recycles the freed work item, it can create a false dependency loop.
+ * There really is no reliable way to detect this short of verifying
+ * every memory free."
+ *
+ */
+static void rpc_free_task(struct rpc_task *task)
+{
+	unsigned short tk_flags = task->tk_flags;
+
+	rpc_release_calldata(task->tk_ops, task->tk_calldata);
+
+	if (tk_flags & RPC_TASK_DYNAMIC) {
+		dprintk("RPC: %5u freeing task\n", task->tk_pid);
+		mempool_free(task, rpc_task_mempool);
+	}
+}
+
+static void rpc_async_release(struct work_struct *work)
+{
+	rpc_free_task(container_of(work, struct rpc_task, u.tk_work));
+}
+
+static void rpc_release_resources_task(struct rpc_task *task)
+{
+	xprt_release(task);
+	if (task->tk_msg.rpc_cred) {
+		put_rpccred(task->tk_msg.rpc_cred);
+		task->tk_msg.rpc_cred = NULL;
+	}
+	rpc_task_release_client(task);
+}
+
+static void rpc_final_put_task(struct rpc_task *task,
+		struct workqueue_struct *q)
+{
+	if (q != NULL) {
+		INIT_WORK(&task->u.tk_work, rpc_async_release);
+		queue_work(q, &task->u.tk_work);
+	} else
+		rpc_free_task(task);
+}
+
+static void rpc_do_put_task(struct rpc_task *task, struct workqueue_struct *q)
+{
+	if (atomic_dec_and_test(&task->tk_count)) {
+		rpc_release_resources_task(task);
+		rpc_final_put_task(task, q);
+	}
+}
+
+void rpc_put_task(struct rpc_task *task)
+{
+	rpc_do_put_task(task, NULL);
+}
+EXPORT_SYMBOL_GPL(rpc_put_task);
+
+void rpc_put_task_async(struct rpc_task *task)
+{
+	rpc_do_put_task(task, task->tk_workqueue);
+}
+EXPORT_SYMBOL_GPL(rpc_put_task_async);
+
+static void rpc_release_task(struct rpc_task *task)
+{
+	dprintk("RPC: %5u release task\n", task->tk_pid);
+
+	WARN_ON_ONCE(RPC_IS_QUEUED(task));
+
+	rpc_release_resources_task(task);
+
+	/*
+	 * Note: at this point we have been removed from rpc_clnt->cl_tasks,
+	 * so it should be safe to use task->tk_count as a test for whether
+	 * or not any other processes still hold references to our rpc_task.
+	 */
+	if (atomic_read(&task->tk_count) != 1 + !RPC_IS_ASYNC(task)) {
+		/* Wake up anyone who may be waiting for task completion */
+		if (!rpc_complete_task(task))
+			return;
+	} else {
+		if (!atomic_dec_and_test(&task->tk_count))
+			return;
+	}
+	rpc_final_put_task(task, task->tk_workqueue);
+}
+
+int rpciod_up(void)
+{
+	return try_module_get(THIS_MODULE) ? 0 : -EINVAL;
+}
+
+void rpciod_down(void)
+{
+	module_put(THIS_MODULE);
+}
+
+/*
+ * Start up the rpciod workqueue.
+ */
+static int rpciod_start(void)
+{
+	struct workqueue_struct *wq;
+
+	/*
+	 * Create the rpciod thread and wait for it to start.
+	 */
+	dprintk("RPC:       creating workqueue rpciod\n");
+	/* Note: highpri because network receive is latency sensitive */
+	wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
+	rpciod_workqueue = wq;
+	return rpciod_workqueue != NULL;
+}
+
+static void rpciod_stop(void)
+{
+	struct workqueue_struct *wq = NULL;
+
+	if (rpciod_workqueue == NULL)
+		return;
+	dprintk("RPC:       destroying workqueue rpciod\n");
+
+	wq = rpciod_workqueue;
+	rpciod_workqueue = NULL;
+	destroy_workqueue(wq);
+}
+
+void
+rpc_destroy_mempool(void)
+{
+	rpciod_stop();
+	if (rpc_buffer_mempool)
+		mempool_destroy(rpc_buffer_mempool);
+	if (rpc_task_mempool)
+		mempool_destroy(rpc_task_mempool);
+	if (rpc_task_slabp)
+		kmem_cache_destroy(rpc_task_slabp);
+	if (rpc_buffer_slabp)
+		kmem_cache_destroy(rpc_buffer_slabp);
+	rpc_destroy_wait_queue(&delay_queue);
+}
+
+int
+rpc_init_mempool(void)
+{
+	/*
+	 * The following is not strictly a mempool initialisation,
+	 * but there is no harm in doing it here
+	 */
+	rpc_init_wait_queue(&delay_queue, "delayq");
+	if (!rpciod_start())
+		goto err_nomem;
+
+	rpc_task_slabp = kmem_cache_create("rpc_tasks",
+					     sizeof(struct rpc_task),
+					     0, SLAB_HWCACHE_ALIGN,
+					     NULL);
+	if (!rpc_task_slabp)
+		goto err_nomem;
+	rpc_buffer_slabp = kmem_cache_create("rpc_buffers",
+					     RPC_BUFFER_MAXSIZE,
+					     0, SLAB_HWCACHE_ALIGN,
+					     NULL);
+	if (!rpc_buffer_slabp)
+		goto err_nomem;
+	rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE,
+						    rpc_task_slabp);
+	if (!rpc_task_mempool)
+		goto err_nomem;
+	rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE,
+						      rpc_buffer_slabp);
+	if (!rpc_buffer_mempool)
+		goto err_nomem;
+	return 0;
+err_nomem:
+	rpc_destroy_mempool();
+	return -ENOMEM;
+}
diff --git a/kernel/net/sunrpc/socklib.c b/kernel/net/sunrpc/socklib.c
new file mode 100644
index 000000000..2df87f78e
--- /dev/null
+++ b/kernel/net/sunrpc/socklib.c
@@ -0,0 +1,187 @@
+/*
+ * linux/net/sunrpc/socklib.c
+ *
+ * Common socket helper routines for RPC client and server
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/compiler.h>
+#include <linux/netdevice.h>
+#include <linux/gfp.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/pagemap.h>
+#include <linux/udp.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/export.h>
+
+
+/**
+ * xdr_skb_read_bits - copy some data bits from skb to internal buffer
+ * @desc: sk_buff copy helper
+ * @to: copy destination
+ * @len: number of bytes to copy
+ *
+ * Possibly called several times to iterate over an sk_buff and copy
+ * data out of it.
+ */
+size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len)
+{
+	if (len > desc->count)
+		len = desc->count;
+	if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len)))
+		return 0;
+	desc->count -= len;
+	desc->offset += len;
+	return len;
+}
+EXPORT_SYMBOL_GPL(xdr_skb_read_bits);
+
+/**
+ * xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer
+ * @desc: sk_buff copy helper
+ * @to: copy destination
+ * @len: number of bytes to copy
+ *
+ * Same as skb_read_bits, but calculate a checksum at the same time.
+ */
+static size_t xdr_skb_read_and_csum_bits(struct xdr_skb_reader *desc, void *to, size_t len)
+{
+	unsigned int pos;
+	__wsum csum2;
+
+	if (len > desc->count)
+		len = desc->count;
+	pos = desc->offset;
+	csum2 = skb_copy_and_csum_bits(desc->skb, pos, to, len, 0);
+	desc->csum = csum_block_add(desc->csum, csum2, pos);
+	desc->count -= len;
+	desc->offset += len;
+	return len;
+}
+
+/**
+ * xdr_partial_copy_from_skb - copy data out of an skb
+ * @xdr: target XDR buffer
+ * @base: starting offset
+ * @desc: sk_buff copy helper
+ * @copy_actor: virtual method for copying data
+ *
+ */
+ssize_t xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base, struct xdr_skb_reader *desc, xdr_skb_read_actor copy_actor)
+{
+	struct page	**ppage = xdr->pages;
+	unsigned int	len, pglen = xdr->page_len;
+	ssize_t		copied = 0;
+	size_t		ret;
+
+	len = xdr->head[0].iov_len;
+	if (base < len) {
+		len -= base;
+		ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len);
+		copied += ret;
+		if (ret != len || !desc->count)
+			goto out;
+		base = 0;
+	} else
+		base -= len;
+
+	if (unlikely(pglen == 0))
+		goto copy_tail;
+	if (unlikely(base >= pglen)) {
+		base -= pglen;
+		goto copy_tail;
+	}
+	if (base || xdr->page_base) {
+		pglen -= base;
+		base += xdr->page_base;
+		ppage += base >> PAGE_CACHE_SHIFT;
+		base &= ~PAGE_CACHE_MASK;
+	}
+	do {
+		char *kaddr;
+
+		/* ACL likes to be lazy in allocating pages - ACLs
+		 * are small by default but can get huge. */
+		if (unlikely(*ppage == NULL)) {
+			*ppage = alloc_page(GFP_ATOMIC);
+			if (unlikely(*ppage == NULL)) {
+				if (copied == 0)
+					copied = -ENOMEM;
+				goto out;
+			}
+		}
+
+		len = PAGE_CACHE_SIZE;
+		kaddr = kmap_atomic(*ppage);
+		if (base) {
+			len -= base;
+			if (pglen < len)
+				len = pglen;
+			ret = copy_actor(desc, kaddr + base, len);
+			base = 0;
+		} else {
+			if (pglen < len)
+				len = pglen;
+			ret = copy_actor(desc, kaddr, len);
+		}
+		flush_dcache_page(*ppage);
+		kunmap_atomic(kaddr);
+		copied += ret;
+		if (ret != len || !desc->count)
+			goto out;
+		ppage++;
+	} while ((pglen -= len) != 0);
+copy_tail:
+	len = xdr->tail[0].iov_len;
+	if (base < len)
+		copied += copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base);
+out:
+	return copied;
+}
+EXPORT_SYMBOL_GPL(xdr_partial_copy_from_skb);
+
+/**
+ * csum_partial_copy_to_xdr - checksum and copy data
+ * @xdr: target XDR buffer
+ * @skb: source skb
+ *
+ * We have set things up such that we perform the checksum of the UDP
+ * packet in parallel with the copies into the RPC client iovec.  -DaveM
+ */
+int csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
+{
+	struct xdr_skb_reader	desc;
+
+	desc.skb = skb;
+	desc.offset = sizeof(struct udphdr);
+	desc.count = skb->len - desc.offset;
+
+	if (skb_csum_unnecessary(skb))
+		goto no_checksum;
+
+	desc.csum = csum_partial(skb->data, desc.offset, skb->csum);
+	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_and_csum_bits) < 0)
+		return -1;
+	if (desc.offset != skb->len) {
+		__wsum csum2;
+		csum2 = skb_checksum(skb, desc.offset, skb->len - desc.offset, 0);
+		desc.csum = csum_block_add(desc.csum, csum2, desc.offset);
+	}
+	if (desc.count)
+		return -1;
+	if (csum_fold(desc.csum))
+		return -1;
+	if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
+	    !skb->csum_complete_sw)
+		netdev_rx_csum_fault(skb->dev);
+	return 0;
+no_checksum:
+	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
+		return -1;
+	if (desc.count)
+		return -1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr);
diff --git a/kernel/net/sunrpc/stats.c b/kernel/net/sunrpc/stats.c
new file mode 100644
index 000000000..2ecb99431
--- /dev/null
+++ b/kernel/net/sunrpc/stats.c
@@ -0,0 +1,305 @@
+/*
+ * linux/net/sunrpc/stats.c
+ *
+ * procfs-based user access to generic RPC statistics. The stats files
+ * reside in /proc/net/rpc.
+ *
+ * The read routines assume that the buffer passed in is just big enough.
+ * If you implement an RPC service that has its own stats routine which
+ * appends the generic RPC stats, make sure you don't exceed the PAGE_SIZE
+ * limit.
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/metrics.h>
+#include <linux/rcupdate.h>
+
+#include "netns.h"
+
+#define RPCDBG_FACILITY	RPCDBG_MISC
+
+/*
+ * Get RPC client stats
+ */
+static int rpc_proc_show(struct seq_file *seq, void *v) {
+	const struct rpc_stat	*statp = seq->private;
+	const struct rpc_program *prog = statp->program;
+	unsigned int i, j;
+
+	seq_printf(seq,
+		"net %u %u %u %u\n",
+			statp->netcnt,
+			statp->netudpcnt,
+			statp->nettcpcnt,
+			statp->nettcpconn);
+	seq_printf(seq,
+		"rpc %u %u %u\n",
+			statp->rpccnt,
+			statp->rpcretrans,
+			statp->rpcauthrefresh);
+
+	for (i = 0; i < prog->nrvers; i++) {
+		const struct rpc_version *vers = prog->version[i];
+		if (!vers)
+			continue;
+		seq_printf(seq, "proc%u %u",
+					vers->number, vers->nrprocs);
+		for (j = 0; j < vers->nrprocs; j++)
+			seq_printf(seq, " %u",
+					vers->procs[j].p_count);
+		seq_putc(seq, '\n');
+	}
+	return 0;
+}
+
+static int rpc_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, rpc_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations rpc_proc_fops = {
+	.owner = THIS_MODULE,
+	.open = rpc_proc_open,
+	.read  = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+/*
+ * Get RPC server stats
+ */
+void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp) {
+	const struct svc_program *prog = statp->program;
+	const struct svc_procedure *proc;
+	const struct svc_version *vers;
+	unsigned int i, j;
+
+	seq_printf(seq,
+		"net %u %u %u %u\n",
+			statp->netcnt,
+			statp->netudpcnt,
+			statp->nettcpcnt,
+			statp->nettcpconn);
+	seq_printf(seq,
+		"rpc %u %u %u %u %u\n",
+			statp->rpccnt,
+			statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
+			statp->rpcbadfmt,
+			statp->rpcbadauth,
+			statp->rpcbadclnt);
+
+	for (i = 0; i < prog->pg_nvers; i++) {
+		if (!(vers = prog->pg_vers[i]) || !(proc = vers->vs_proc))
+			continue;
+		seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
+		for (j = 0; j < vers->vs_nproc; j++, proc++)
+			seq_printf(seq, " %u", proc->pc_count);
+		seq_putc(seq, '\n');
+	}
+}
+EXPORT_SYMBOL_GPL(svc_seq_show);
+
+/**
+ * rpc_alloc_iostats - allocate an rpc_iostats structure
+ * @clnt: RPC program, version, and xprt
+ *
+ */
+struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
+{
+	struct rpc_iostats *stats;
+	int i;
+
+	stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
+	if (stats) {
+		for (i = 0; i < clnt->cl_maxproc; i++)
+			spin_lock_init(&stats[i].om_lock);
+	}
+	return stats;
+}
+EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
+
+/**
+ * rpc_free_iostats - release an rpc_iostats structure
+ * @stats: doomed rpc_iostats structure
+ *
+ */
+void rpc_free_iostats(struct rpc_iostats *stats)
+{
+	kfree(stats);
+}
+EXPORT_SYMBOL_GPL(rpc_free_iostats);
+
+/**
+ * rpc_count_iostats_metrics - tally up per-task stats
+ * @task: completed rpc_task
+ * @op_metrics: stat structure for OP that will accumulate stats from @task
+ */
+void rpc_count_iostats_metrics(const struct rpc_task *task,
+			       struct rpc_iostats *op_metrics)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	ktime_t delta, now;
+
+	if (!op_metrics || !req)
+		return;
+
+	now = ktime_get();
+	spin_lock(&op_metrics->om_lock);
+
+	op_metrics->om_ops++;
+	op_metrics->om_ntrans += req->rq_ntrans;
+	op_metrics->om_timeouts += task->tk_timeouts;
+
+	op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
+	op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
+
+	delta = ktime_sub(req->rq_xtime, task->tk_start);
+	op_metrics->om_queue = ktime_add(op_metrics->om_queue, delta);
+
+	op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
+
+	delta = ktime_sub(now, task->tk_start);
+	op_metrics->om_execute = ktime_add(op_metrics->om_execute, delta);
+
+	spin_unlock(&op_metrics->om_lock);
+}
+EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
+
+/**
+ * rpc_count_iostats - tally up per-task stats
+ * @task: completed rpc_task
+ * @stats: array of stat structures
+ *
+ * Uses the statidx from @task
+ */
+void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
+{
+	rpc_count_iostats_metrics(task,
+				  &stats[task->tk_msg.rpc_proc->p_statidx]);
+}
+EXPORT_SYMBOL_GPL(rpc_count_iostats);
+
+static void _print_name(struct seq_file *seq, unsigned int op,
+			struct rpc_procinfo *procs)
+{
+	if (procs[op].p_name)
+		seq_printf(seq, "\t%12s: ", procs[op].p_name);
+	else if (op == 0)
+		seq_printf(seq, "\t        NULL: ");
+	else
+		seq_printf(seq, "\t%12u: ", op);
+}
+
+void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
+{
+	struct rpc_iostats *stats = clnt->cl_metrics;
+	struct rpc_xprt *xprt;
+	unsigned int op, maxproc = clnt->cl_maxproc;
+
+	if (!stats)
+		return;
+
+	seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
+	seq_printf(seq, "p/v: %u/%u (%s)\n",
+			clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
+
+	rcu_read_lock();
+	xprt = rcu_dereference(clnt->cl_xprt);
+	if (xprt)
+		xprt->ops->print_stats(xprt, seq);
+	rcu_read_unlock();
+
+	seq_printf(seq, "\tper-op statistics\n");
+	for (op = 0; op < maxproc; op++) {
+		struct rpc_iostats *metrics = &stats[op];
+		_print_name(seq, op, clnt->cl_procinfo);
+		seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
+				metrics->om_ops,
+				metrics->om_ntrans,
+				metrics->om_timeouts,
+				metrics->om_bytes_sent,
+				metrics->om_bytes_recv,
+				ktime_to_ms(metrics->om_queue),
+				ktime_to_ms(metrics->om_rtt),
+				ktime_to_ms(metrics->om_execute));
+	}
+}
+EXPORT_SYMBOL_GPL(rpc_print_iostats);
+
+/*
+ * Register/unregister RPC proc files
+ */
+static inline struct proc_dir_entry *
+do_register(struct net *net, const char *name, void *data,
+	    const struct file_operations *fops)
+{
+	struct sunrpc_net *sn;
+
+	dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
+	sn = net_generic(net, sunrpc_net_id);
+	return proc_create_data(name, 0, sn->proc_net_rpc, fops, data);
+}
+
+struct proc_dir_entry *
+rpc_proc_register(struct net *net, struct rpc_stat *statp)
+{
+	return do_register(net, statp->program->name, statp, &rpc_proc_fops);
+}
+EXPORT_SYMBOL_GPL(rpc_proc_register);
+
+void
+rpc_proc_unregister(struct net *net, const char *name)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	remove_proc_entry(name, sn->proc_net_rpc);
+}
+EXPORT_SYMBOL_GPL(rpc_proc_unregister);
+
+struct proc_dir_entry *
+svc_proc_register(struct net *net, struct svc_stat *statp, const struct file_operations *fops)
+{
+	return do_register(net, statp->program->pg_name, statp, fops);
+}
+EXPORT_SYMBOL_GPL(svc_proc_register);
+
+void
+svc_proc_unregister(struct net *net, const char *name)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	remove_proc_entry(name, sn->proc_net_rpc);
+}
+EXPORT_SYMBOL_GPL(svc_proc_unregister);
+
+int rpc_proc_init(struct net *net)
+{
+	struct sunrpc_net *sn;
+
+	dprintk("RPC:       registering /proc/net/rpc\n");
+	sn = net_generic(net, sunrpc_net_id);
+	sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
+	if (sn->proc_net_rpc == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void rpc_proc_exit(struct net *net)
+{
+	dprintk("RPC:       unregistering /proc/net/rpc\n");
+	remove_proc_entry("rpc", net->proc_net);
+}
+
diff --git a/kernel/net/sunrpc/sunrpc.h b/kernel/net/sunrpc/sunrpc.h
new file mode 100644
index 000000000..f2b7cb540
--- /dev/null
+++ b/kernel/net/sunrpc/sunrpc.h
@@ -0,0 +1,66 @@
+/******************************************************************************
+
+(c) 2008 NetApp.  All Rights Reserved.
+
+NetApp provides this source code under the GPL v2 License.
+The GPL v2 license is available at
+http://opensource.org/licenses/gpl-license.php.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+******************************************************************************/
+
+/*
+ * Functions and macros used internally by RPC
+ */
+
+#ifndef _NET_SUNRPC_SUNRPC_H
+#define _NET_SUNRPC_SUNRPC_H
+
+#include <linux/net.h>
+
+/*
+ * Header for dynamically allocated rpc buffers.
+ */
+struct rpc_buffer {
+	size_t	len;
+	char	data[];
+};
+
+static inline int rpc_reply_expected(struct rpc_task *task)
+{
+	return (task->tk_msg.rpc_proc != NULL) &&
+		(task->tk_msg.rpc_proc->p_decode != NULL);
+}
+
+static inline int sock_is_loopback(struct sock *sk)
+{
+	struct dst_entry *dst;
+	int loopback = 0;
+	rcu_read_lock();
+	dst = rcu_dereference(sk->sk_dst_cache);
+	if (dst && dst->dev &&
+	    (dst->dev->features & NETIF_F_LOOPBACK))
+		loopback = 1;
+	rcu_read_unlock();
+	return loopback;
+}
+
+int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
+		    struct page *headpage, unsigned long headoffset,
+		    struct page *tailpage, unsigned long tailoffset);
+
+int rpc_clients_notifier_register(void);
+void rpc_clients_notifier_unregister(void);
+#endif /* _NET_SUNRPC_SUNRPC_H */
+
diff --git a/kernel/net/sunrpc/sunrpc_syms.c b/kernel/net/sunrpc/sunrpc_syms.c
new file mode 100644
index 000000000..ee5d3d253
--- /dev/null
+++ b/kernel/net/sunrpc/sunrpc_syms.c
@@ -0,0 +1,136 @@
+/*
+ * linux/net/sunrpc/sunrpc_syms.c
+ *
+ * Symbols exported by the sunrpc module.
+ *
+ * Copyright (C) 1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/uio.h>
+#include <linux/unistd.h>
+#include <linux/init.h>
+
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/xprtsock.h>
+
+#include "netns.h"
+
+int sunrpc_net_id;
+EXPORT_SYMBOL_GPL(sunrpc_net_id);
+
+static __net_init int sunrpc_init_net(struct net *net)
+{
+	int err;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	err = rpc_proc_init(net);
+	if (err)
+		goto err_proc;
+
+	err = ip_map_cache_create(net);
+	if (err)
+		goto err_ipmap;
+
+	err = unix_gid_cache_create(net);
+	if (err)
+		goto err_unixgid;
+
+	err = rpc_pipefs_init_net(net);
+	if (err)
+		goto err_pipefs;
+
+	INIT_LIST_HEAD(&sn->all_clients);
+	spin_lock_init(&sn->rpc_client_lock);
+	spin_lock_init(&sn->rpcb_clnt_lock);
+	return 0;
+
+err_pipefs:
+	unix_gid_cache_destroy(net);
+err_unixgid:
+	ip_map_cache_destroy(net);
+err_ipmap:
+	rpc_proc_exit(net);
+err_proc:
+	return err;
+}
+
+static __net_exit void sunrpc_exit_net(struct net *net)
+{
+	rpc_pipefs_exit_net(net);
+	unix_gid_cache_destroy(net);
+	ip_map_cache_destroy(net);
+	rpc_proc_exit(net);
+}
+
+static struct pernet_operations sunrpc_net_ops = {
+	.init = sunrpc_init_net,
+	.exit = sunrpc_exit_net,
+	.id = &sunrpc_net_id,
+	.size = sizeof(struct sunrpc_net),
+};
+
+static int __init
+init_sunrpc(void)
+{
+	int err = rpc_init_mempool();
+	if (err)
+		goto out;
+	err = rpcauth_init_module();
+	if (err)
+		goto out2;
+
+	cache_initialize();
+
+	err = register_pernet_subsys(&sunrpc_net_ops);
+	if (err)
+		goto out3;
+
+	err = register_rpc_pipefs();
+	if (err)
+		goto out4;
+
+	sunrpc_debugfs_init();
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	rpc_register_sysctl();
+#endif
+	svc_init_xprt_sock();	/* svc sock transport */
+	init_socket_xprt();	/* clnt sock transport */
+	return 0;
+
+out4:
+	unregister_pernet_subsys(&sunrpc_net_ops);
+out3:
+	rpcauth_remove_module();
+out2:
+	rpc_destroy_mempool();
+out:
+	return err;
+}
+
+static void __exit
+cleanup_sunrpc(void)
+{
+	rpcauth_remove_module();
+	cleanup_socket_xprt();
+	svc_cleanup_xprt_sock();
+	sunrpc_debugfs_exit();
+	unregister_rpc_pipefs();
+	rpc_destroy_mempool();
+	unregister_pernet_subsys(&sunrpc_net_ops);
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	rpc_unregister_sysctl();
+#endif
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
+}
+MODULE_LICENSE("GPL");
+fs_initcall(init_sunrpc); /* Ensure we're initialised before nfs */
+module_exit(cleanup_sunrpc);
diff --git a/kernel/net/sunrpc/svc.c b/kernel/net/sunrpc/svc.c
new file mode 100644
index 000000000..78974e4d9
--- /dev/null
+++ b/kernel/net/sunrpc/svc.c
@@ -0,0 +1,1405 @@
+/*
+ * linux/net/sunrpc/svc.c
+ *
+ * High-level RPC service routines
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ *
+ * Multiple threads pools and NUMAisation
+ * Copyright (c) 2006 Silicon Graphics, Inc.
+ * by Greg Banks <gnb@melbourne.sgi.com>
+ */
+
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/bc_xprt.h>
+
+#include <trace/events/sunrpc.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCDSP
+
+static void svc_unregister(const struct svc_serv *serv, struct net *net);
+
+#define svc_serv_is_pooled(serv)    ((serv)->sv_function)
+
+/*
+ * Mode for mapping cpus to pools.
+ */
+enum {
+	SVC_POOL_AUTO = -1,	/* choose one of the others */
+	SVC_POOL_GLOBAL,	/* no mapping, just a single global pool
+				 * (legacy & UP mode) */
+	SVC_POOL_PERCPU,	/* one pool per cpu */
+	SVC_POOL_PERNODE	/* one pool per numa node */
+};
+#define SVC_POOL_DEFAULT	SVC_POOL_GLOBAL
+
+/*
+ * Structure for mapping cpus to pools and vice versa.
+ * Setup once during sunrpc initialisation.
+ */
+static struct svc_pool_map {
+	int count;			/* How many svc_servs use us */
+	int mode;			/* Note: int not enum to avoid
+					 * warnings about "enumeration value
+					 * not handled in switch" */
+	unsigned int npools;
+	unsigned int *pool_to;		/* maps pool id to cpu or node */
+	unsigned int *to_pool;		/* maps cpu or node to pool id */
+} svc_pool_map = {
+	.count = 0,
+	.mode = SVC_POOL_DEFAULT
+};
+static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
+
+static int
+param_set_pool_mode(const char *val, struct kernel_param *kp)
+{
+	int *ip = (int *)kp->arg;
+	struct svc_pool_map *m = &svc_pool_map;
+	int err;
+
+	mutex_lock(&svc_pool_map_mutex);
+
+	err = -EBUSY;
+	if (m->count)
+		goto out;
+
+	err = 0;
+	if (!strncmp(val, "auto", 4))
+		*ip = SVC_POOL_AUTO;
+	else if (!strncmp(val, "global", 6))
+		*ip = SVC_POOL_GLOBAL;
+	else if (!strncmp(val, "percpu", 6))
+		*ip = SVC_POOL_PERCPU;
+	else if (!strncmp(val, "pernode", 7))
+		*ip = SVC_POOL_PERNODE;
+	else
+		err = -EINVAL;
+
+out:
+	mutex_unlock(&svc_pool_map_mutex);
+	return err;
+}
+
+static int
+param_get_pool_mode(char *buf, struct kernel_param *kp)
+{
+	int *ip = (int *)kp->arg;
+
+	switch (*ip)
+	{
+	case SVC_POOL_AUTO:
+		return strlcpy(buf, "auto", 20);
+	case SVC_POOL_GLOBAL:
+		return strlcpy(buf, "global", 20);
+	case SVC_POOL_PERCPU:
+		return strlcpy(buf, "percpu", 20);
+	case SVC_POOL_PERNODE:
+		return strlcpy(buf, "pernode", 20);
+	default:
+		return sprintf(buf, "%d", *ip);
+	}
+}
+
+module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
+		 &svc_pool_map.mode, 0644);
+
+/*
+ * Detect best pool mapping mode heuristically,
+ * according to the machine's topology.
+ */
+static int
+svc_pool_map_choose_mode(void)
+{
+	unsigned int node;
+
+	if (nr_online_nodes > 1) {
+		/*
+		 * Actually have multiple NUMA nodes,
+		 * so split pools on NUMA node boundaries
+		 */
+		return SVC_POOL_PERNODE;
+	}
+
+	node = first_online_node;
+	if (nr_cpus_node(node) > 2) {
+		/*
+		 * Non-trivial SMP, or CONFIG_NUMA on
+		 * non-NUMA hardware, e.g. with a generic
+		 * x86_64 kernel on Xeons.  In this case we
+		 * want to divide the pools on cpu boundaries.
+		 */
+		return SVC_POOL_PERCPU;
+	}
+
+	/* default: one global pool */
+	return SVC_POOL_GLOBAL;
+}
+
+/*
+ * Allocate the to_pool[] and pool_to[] arrays.
+ * Returns 0 on success or an errno.
+ */
+static int
+svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
+{
+	m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
+	if (!m->to_pool)
+		goto fail;
+	m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
+	if (!m->pool_to)
+		goto fail_free;
+
+	return 0;
+
+fail_free:
+	kfree(m->to_pool);
+	m->to_pool = NULL;
+fail:
+	return -ENOMEM;
+}
+
+/*
+ * Initialise the pool map for SVC_POOL_PERCPU mode.
+ * Returns number of pools or <0 on error.
+ */
+static int
+svc_pool_map_init_percpu(struct svc_pool_map *m)
+{
+	unsigned int maxpools = nr_cpu_ids;
+	unsigned int pidx = 0;
+	unsigned int cpu;
+	int err;
+
+	err = svc_pool_map_alloc_arrays(m, maxpools);
+	if (err)
+		return err;
+
+	for_each_online_cpu(cpu) {
+		BUG_ON(pidx >= maxpools);
+		m->to_pool[cpu] = pidx;
+		m->pool_to[pidx] = cpu;
+		pidx++;
+	}
+	/* cpus brought online later all get mapped to pool0, sorry */
+
+	return pidx;
+};
+
+
+/*
+ * Initialise the pool map for SVC_POOL_PERNODE mode.
+ * Returns number of pools or <0 on error.
+ */
+static int
+svc_pool_map_init_pernode(struct svc_pool_map *m)
+{
+	unsigned int maxpools = nr_node_ids;
+	unsigned int pidx = 0;
+	unsigned int node;
+	int err;
+
+	err = svc_pool_map_alloc_arrays(m, maxpools);
+	if (err)
+		return err;
+
+	for_each_node_with_cpus(node) {
+		/* some architectures (e.g. SN2) have cpuless nodes */
+		BUG_ON(pidx > maxpools);
+		m->to_pool[node] = pidx;
+		m->pool_to[pidx] = node;
+		pidx++;
+	}
+	/* nodes brought online later all get mapped to pool0, sorry */
+
+	return pidx;
+}
+
+
+/*
+ * Add a reference to the global map of cpus to pools (and
+ * vice versa).  Initialise the map if we're the first user.
+ * Returns the number of pools.
+ */
+static unsigned int
+svc_pool_map_get(void)
+{
+	struct svc_pool_map *m = &svc_pool_map;
+	int npools = -1;
+
+	mutex_lock(&svc_pool_map_mutex);
+
+	if (m->count++) {
+		mutex_unlock(&svc_pool_map_mutex);
+		return m->npools;
+	}
+
+	if (m->mode == SVC_POOL_AUTO)
+		m->mode = svc_pool_map_choose_mode();
+
+	switch (m->mode) {
+	case SVC_POOL_PERCPU:
+		npools = svc_pool_map_init_percpu(m);
+		break;
+	case SVC_POOL_PERNODE:
+		npools = svc_pool_map_init_pernode(m);
+		break;
+	}
+
+	if (npools < 0) {
+		/* default, or memory allocation failure */
+		npools = 1;
+		m->mode = SVC_POOL_GLOBAL;
+	}
+	m->npools = npools;
+
+	mutex_unlock(&svc_pool_map_mutex);
+	return m->npools;
+}
+
+
+/*
+ * Drop a reference to the global map of cpus to pools.
+ * When the last reference is dropped, the map data is
+ * freed; this allows the sysadmin to change the pool
+ * mode using the pool_mode module option without
+ * rebooting or re-loading sunrpc.ko.
+ */
+static void
+svc_pool_map_put(void)
+{
+	struct svc_pool_map *m = &svc_pool_map;
+
+	mutex_lock(&svc_pool_map_mutex);
+
+	if (!--m->count) {
+		kfree(m->to_pool);
+		m->to_pool = NULL;
+		kfree(m->pool_to);
+		m->pool_to = NULL;
+		m->npools = 0;
+	}
+
+	mutex_unlock(&svc_pool_map_mutex);
+}
+
+
+static int svc_pool_map_get_node(unsigned int pidx)
+{
+	const struct svc_pool_map *m = &svc_pool_map;
+
+	if (m->count) {
+		if (m->mode == SVC_POOL_PERCPU)
+			return cpu_to_node(m->pool_to[pidx]);
+		if (m->mode == SVC_POOL_PERNODE)
+			return m->pool_to[pidx];
+	}
+	return NUMA_NO_NODE;
+}
+/*
+ * Set the given thread's cpus_allowed mask so that it
+ * will only run on cpus in the given pool.
+ */
+static inline void
+svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
+{
+	struct svc_pool_map *m = &svc_pool_map;
+	unsigned int node = m->pool_to[pidx];
+
+	/*
+	 * The caller checks for sv_nrpools > 1, which
+	 * implies that we've been initialized.
+	 */
+	WARN_ON_ONCE(m->count == 0);
+	if (m->count == 0)
+		return;
+
+	switch (m->mode) {
+	case SVC_POOL_PERCPU:
+	{
+		set_cpus_allowed_ptr(task, cpumask_of(node));
+		break;
+	}
+	case SVC_POOL_PERNODE:
+	{
+		set_cpus_allowed_ptr(task, cpumask_of_node(node));
+		break;
+	}
+	}
+}
+
+/*
+ * Use the mapping mode to choose a pool for a given CPU.
+ * Used when enqueueing an incoming RPC.  Always returns
+ * a non-NULL pool pointer.
+ */
+struct svc_pool *
+svc_pool_for_cpu(struct svc_serv *serv, int cpu)
+{
+	struct svc_pool_map *m = &svc_pool_map;
+	unsigned int pidx = 0;
+
+	/*
+	 * An uninitialised map happens in a pure client when
+	 * lockd is brought up, so silently treat it the
+	 * same as SVC_POOL_GLOBAL.
+	 */
+	if (svc_serv_is_pooled(serv)) {
+		switch (m->mode) {
+		case SVC_POOL_PERCPU:
+			pidx = m->to_pool[cpu];
+			break;
+		case SVC_POOL_PERNODE:
+			pidx = m->to_pool[cpu_to_node(cpu)];
+			break;
+		}
+	}
+	return &serv->sv_pools[pidx % serv->sv_nrpools];
+}
+
+int svc_rpcb_setup(struct svc_serv *serv, struct net *net)
+{
+	int err;
+
+	err = rpcb_create_local(net);
+	if (err)
+		return err;
+
+	/* Remove any stale portmap registrations */
+	svc_unregister(serv, net);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(svc_rpcb_setup);
+
+void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net)
+{
+	svc_unregister(serv, net);
+	rpcb_put_local(net);
+}
+EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
+
+static int svc_uses_rpcbind(struct svc_serv *serv)
+{
+	struct svc_program	*progp;
+	unsigned int		i;
+
+	for (progp = serv->sv_program; progp; progp = progp->pg_next) {
+		for (i = 0; i < progp->pg_nvers; i++) {
+			if (progp->pg_vers[i] == NULL)
+				continue;
+			if (progp->pg_vers[i]->vs_hidden == 0)
+				return 1;
+		}
+	}
+
+	return 0;
+}
+
+int svc_bind(struct svc_serv *serv, struct net *net)
+{
+	if (!svc_uses_rpcbind(serv))
+		return 0;
+	return svc_rpcb_setup(serv, net);
+}
+EXPORT_SYMBOL_GPL(svc_bind);
+
+/*
+ * Create an RPC service
+ */
+static struct svc_serv *
+__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
+	     void (*shutdown)(struct svc_serv *serv, struct net *net))
+{
+	struct svc_serv	*serv;
+	unsigned int vers;
+	unsigned int xdrsize;
+	unsigned int i;
+
+	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
+		return NULL;
+	serv->sv_name      = prog->pg_name;
+	serv->sv_program   = prog;
+	serv->sv_nrthreads = 1;
+	serv->sv_stats     = prog->pg_stats;
+	if (bufsize > RPCSVC_MAXPAYLOAD)
+		bufsize = RPCSVC_MAXPAYLOAD;
+	serv->sv_max_payload = bufsize? bufsize : 4096;
+	serv->sv_max_mesg  = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
+	serv->sv_shutdown  = shutdown;
+	xdrsize = 0;
+	while (prog) {
+		prog->pg_lovers = prog->pg_nvers-1;
+		for (vers=0; vers<prog->pg_nvers ; vers++)
+			if (prog->pg_vers[vers]) {
+				prog->pg_hivers = vers;
+				if (prog->pg_lovers > vers)
+					prog->pg_lovers = vers;
+				if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
+					xdrsize = prog->pg_vers[vers]->vs_xdrsize;
+			}
+		prog = prog->pg_next;
+	}
+	serv->sv_xdrsize   = xdrsize;
+	INIT_LIST_HEAD(&serv->sv_tempsocks);
+	INIT_LIST_HEAD(&serv->sv_permsocks);
+	init_timer(&serv->sv_temptimer);
+	spin_lock_init(&serv->sv_lock);
+
+	serv->sv_nrpools = npools;
+	serv->sv_pools =
+		kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
+			GFP_KERNEL);
+	if (!serv->sv_pools) {
+		kfree(serv);
+		return NULL;
+	}
+
+	for (i = 0; i < serv->sv_nrpools; i++) {
+		struct svc_pool *pool = &serv->sv_pools[i];
+
+		dprintk("svc: initialising pool %u for %s\n",
+				i, serv->sv_name);
+
+		pool->sp_id = i;
+		INIT_LIST_HEAD(&pool->sp_sockets);
+		INIT_LIST_HEAD(&pool->sp_all_threads);
+		spin_lock_init(&pool->sp_lock);
+	}
+
+	return serv;
+}
+
+struct svc_serv *
+svc_create(struct svc_program *prog, unsigned int bufsize,
+	   void (*shutdown)(struct svc_serv *serv, struct net *net))
+{
+	return __svc_create(prog, bufsize, /*npools*/1, shutdown);
+}
+EXPORT_SYMBOL_GPL(svc_create);
+
+struct svc_serv *
+svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
+		  void (*shutdown)(struct svc_serv *serv, struct net *net),
+		  svc_thread_fn func, struct module *mod)
+{
+	struct svc_serv *serv;
+	unsigned int npools = svc_pool_map_get();
+
+	serv = __svc_create(prog, bufsize, npools, shutdown);
+	if (!serv)
+		goto out_err;
+
+	serv->sv_function = func;
+	serv->sv_module = mod;
+	return serv;
+out_err:
+	svc_pool_map_put();
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(svc_create_pooled);
+
+void svc_shutdown_net(struct svc_serv *serv, struct net *net)
+{
+	svc_close_net(serv, net);
+
+	if (serv->sv_shutdown)
+		serv->sv_shutdown(serv, net);
+}
+EXPORT_SYMBOL_GPL(svc_shutdown_net);
+
+/*
+ * Destroy an RPC service. Should be called with appropriate locking to
+ * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
+ */
+void
+svc_destroy(struct svc_serv *serv)
+{
+	dprintk("svc: svc_destroy(%s, %d)\n",
+				serv->sv_program->pg_name,
+				serv->sv_nrthreads);
+
+	if (serv->sv_nrthreads) {
+		if (--(serv->sv_nrthreads) != 0) {
+			svc_sock_update_bufs(serv);
+			return;
+		}
+	} else
+		printk("svc_destroy: no threads for serv=%p!\n", serv);
+
+	del_timer_sync(&serv->sv_temptimer);
+
+	/*
+	 * The last user is gone and thus all sockets have to be destroyed to
+	 * the point. Check this.
+	 */
+	BUG_ON(!list_empty(&serv->sv_permsocks));
+	BUG_ON(!list_empty(&serv->sv_tempsocks));
+
+	cache_clean_deferred(serv);
+
+	if (svc_serv_is_pooled(serv))
+		svc_pool_map_put();
+
+	kfree(serv->sv_pools);
+	kfree(serv);
+}
+EXPORT_SYMBOL_GPL(svc_destroy);
+
+/*
+ * Allocate an RPC server's buffer space.
+ * We allocate pages and place them in rq_argpages.
+ */
+static int
+svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node)
+{
+	unsigned int pages, arghi;
+
+	/* bc_xprt uses fore channel allocated buffers */
+	if (svc_is_backchannel(rqstp))
+		return 1;
+
+	pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
+				       * We assume one is at most one page
+				       */
+	arghi = 0;
+	WARN_ON_ONCE(pages > RPCSVC_MAXPAGES);
+	if (pages > RPCSVC_MAXPAGES)
+		pages = RPCSVC_MAXPAGES;
+	while (pages) {
+		struct page *p = alloc_pages_node(node, GFP_KERNEL, 0);
+		if (!p)
+			break;
+		rqstp->rq_pages[arghi++] = p;
+		pages--;
+	}
+	return pages == 0;
+}
+
+/*
+ * Release an RPC server buffer
+ */
+static void
+svc_release_buffer(struct svc_rqst *rqstp)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
+		if (rqstp->rq_pages[i])
+			put_page(rqstp->rq_pages[i]);
+}
+
+struct svc_rqst *
+svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
+{
+	struct svc_rqst	*rqstp;
+
+	rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node);
+	if (!rqstp)
+		goto out_enomem;
+
+	serv->sv_nrthreads++;
+	__set_bit(RQ_BUSY, &rqstp->rq_flags);
+	spin_lock_init(&rqstp->rq_lock);
+	rqstp->rq_server = serv;
+	rqstp->rq_pool = pool;
+	spin_lock_bh(&pool->sp_lock);
+	pool->sp_nrthreads++;
+	list_add_rcu(&rqstp->rq_all, &pool->sp_all_threads);
+	spin_unlock_bh(&pool->sp_lock);
+
+	rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
+	if (!rqstp->rq_argp)
+		goto out_thread;
+
+	rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
+	if (!rqstp->rq_resp)
+		goto out_thread;
+
+	if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
+		goto out_thread;
+
+	return rqstp;
+out_thread:
+	svc_exit_thread(rqstp);
+out_enomem:
+	return ERR_PTR(-ENOMEM);
+}
+EXPORT_SYMBOL_GPL(svc_prepare_thread);
+
+/*
+ * Choose a pool in which to create a new thread, for svc_set_num_threads
+ */
+static inline struct svc_pool *
+choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
+{
+	if (pool != NULL)
+		return pool;
+
+	return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
+}
+
+/*
+ * Choose a thread to kill, for svc_set_num_threads
+ */
+static inline struct task_struct *
+choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
+{
+	unsigned int i;
+	struct task_struct *task = NULL;
+
+	if (pool != NULL) {
+		spin_lock_bh(&pool->sp_lock);
+	} else {
+		/* choose a pool in round-robin fashion */
+		for (i = 0; i < serv->sv_nrpools; i++) {
+			pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
+			spin_lock_bh(&pool->sp_lock);
+			if (!list_empty(&pool->sp_all_threads))
+				goto found_pool;
+			spin_unlock_bh(&pool->sp_lock);
+		}
+		return NULL;
+	}
+
+found_pool:
+	if (!list_empty(&pool->sp_all_threads)) {
+		struct svc_rqst *rqstp;
+
+		/*
+		 * Remove from the pool->sp_all_threads list
+		 * so we don't try to kill it again.
+		 */
+		rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
+		set_bit(RQ_VICTIM, &rqstp->rq_flags);
+		list_del_rcu(&rqstp->rq_all);
+		task = rqstp->rq_task;
+	}
+	spin_unlock_bh(&pool->sp_lock);
+
+	return task;
+}
+
+/*
+ * Create or destroy enough new threads to make the number
+ * of threads the given number.  If `pool' is non-NULL, applies
+ * only to threads in that pool, otherwise round-robins between
+ * all pools.  Caller must ensure that mutual exclusion between this and
+ * server startup or shutdown.
+ *
+ * Destroying threads relies on the service threads filling in
+ * rqstp->rq_task, which only the nfs ones do.  Assumes the serv
+ * has been created using svc_create_pooled().
+ *
+ * Based on code that used to be in nfsd_svc() but tweaked
+ * to be pool-aware.
+ */
+int
+svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
+{
+	struct svc_rqst	*rqstp;
+	struct task_struct *task;
+	struct svc_pool *chosen_pool;
+	int error = 0;
+	unsigned int state = serv->sv_nrthreads-1;
+	int node;
+
+	if (pool == NULL) {
+		/* The -1 assumes caller has done a svc_get() */
+		nrservs -= (serv->sv_nrthreads-1);
+	} else {
+		spin_lock_bh(&pool->sp_lock);
+		nrservs -= pool->sp_nrthreads;
+		spin_unlock_bh(&pool->sp_lock);
+	}
+
+	/* create new threads */
+	while (nrservs > 0) {
+		nrservs--;
+		chosen_pool = choose_pool(serv, pool, &state);
+
+		node = svc_pool_map_get_node(chosen_pool->sp_id);
+		rqstp = svc_prepare_thread(serv, chosen_pool, node);
+		if (IS_ERR(rqstp)) {
+			error = PTR_ERR(rqstp);
+			break;
+		}
+
+		__module_get(serv->sv_module);
+		task = kthread_create_on_node(serv->sv_function, rqstp,
+					      node, "%s", serv->sv_name);
+		if (IS_ERR(task)) {
+			error = PTR_ERR(task);
+			module_put(serv->sv_module);
+			svc_exit_thread(rqstp);
+			break;
+		}
+
+		rqstp->rq_task = task;
+		if (serv->sv_nrpools > 1)
+			svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
+
+		svc_sock_update_bufs(serv);
+		wake_up_process(task);
+	}
+	/* destroy old threads */
+	while (nrservs < 0 &&
+	       (task = choose_victim(serv, pool, &state)) != NULL) {
+		send_sig(SIGINT, task, 1);
+		nrservs++;
+	}
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(svc_set_num_threads);
+
+/*
+ * Called from a server thread as it's exiting. Caller must hold the "service
+ * mutex" for the service.
+ */
+void
+svc_exit_thread(struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = rqstp->rq_server;
+	struct svc_pool	*pool = rqstp->rq_pool;
+
+	svc_release_buffer(rqstp);
+	kfree(rqstp->rq_resp);
+	kfree(rqstp->rq_argp);
+	kfree(rqstp->rq_auth_data);
+
+	spin_lock_bh(&pool->sp_lock);
+	pool->sp_nrthreads--;
+	if (!test_and_set_bit(RQ_VICTIM, &rqstp->rq_flags))
+		list_del_rcu(&rqstp->rq_all);
+	spin_unlock_bh(&pool->sp_lock);
+
+	kfree_rcu(rqstp, rq_rcu_head);
+
+	/* Release the server */
+	if (serv)
+		svc_destroy(serv);
+}
+EXPORT_SYMBOL_GPL(svc_exit_thread);
+
+/*
+ * Register an "inet" protocol family netid with the local
+ * rpcbind daemon via an rpcbind v4 SET request.
+ *
+ * No netconfig infrastructure is available in the kernel, so
+ * we map IP_ protocol numbers to netids by hand.
+ *
+ * Returns zero on success; a negative errno value is returned
+ * if any error occurs.
+ */
+static int __svc_rpcb_register4(struct net *net, const u32 program,
+				const u32 version,
+				const unsigned short protocol,
+				const unsigned short port)
+{
+	const struct sockaddr_in sin = {
+		.sin_family		= AF_INET,
+		.sin_addr.s_addr	= htonl(INADDR_ANY),
+		.sin_port		= htons(port),
+	};
+	const char *netid;
+	int error;
+
+	switch (protocol) {
+	case IPPROTO_UDP:
+		netid = RPCBIND_NETID_UDP;
+		break;
+	case IPPROTO_TCP:
+		netid = RPCBIND_NETID_TCP;
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+
+	error = rpcb_v4_register(net, program, version,
+					(const struct sockaddr *)&sin, netid);
+
+	/*
+	 * User space didn't support rpcbind v4, so retry this
+	 * registration request with the legacy rpcbind v2 protocol.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = rpcb_register(net, program, version, protocol, port);
+
+	return error;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+/*
+ * Register an "inet6" protocol family netid with the local
+ * rpcbind daemon via an rpcbind v4 SET request.
+ *
+ * No netconfig infrastructure is available in the kernel, so
+ * we map IP_ protocol numbers to netids by hand.
+ *
+ * Returns zero on success; a negative errno value is returned
+ * if any error occurs.
+ */
+static int __svc_rpcb_register6(struct net *net, const u32 program,
+				const u32 version,
+				const unsigned short protocol,
+				const unsigned short port)
+{
+	const struct sockaddr_in6 sin6 = {
+		.sin6_family		= AF_INET6,
+		.sin6_addr		= IN6ADDR_ANY_INIT,
+		.sin6_port		= htons(port),
+	};
+	const char *netid;
+	int error;
+
+	switch (protocol) {
+	case IPPROTO_UDP:
+		netid = RPCBIND_NETID_UDP6;
+		break;
+	case IPPROTO_TCP:
+		netid = RPCBIND_NETID_TCP6;
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+
+	error = rpcb_v4_register(net, program, version,
+					(const struct sockaddr *)&sin6, netid);
+
+	/*
+	 * User space didn't support rpcbind version 4, so we won't
+	 * use a PF_INET6 listener.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = -EAFNOSUPPORT;
+
+	return error;
+}
+#endif	/* IS_ENABLED(CONFIG_IPV6) */
+
+/*
+ * Register a kernel RPC service via rpcbind version 4.
+ *
+ * Returns zero on success; a negative errno value is returned
+ * if any error occurs.
+ */
+static int __svc_register(struct net *net, const char *progname,
+			  const u32 program, const u32 version,
+			  const int family,
+			  const unsigned short protocol,
+			  const unsigned short port)
+{
+	int error = -EAFNOSUPPORT;
+
+	switch (family) {
+	case PF_INET:
+		error = __svc_rpcb_register4(net, program, version,
+						protocol, port);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case PF_INET6:
+		error = __svc_rpcb_register6(net, program, version,
+						protocol, port);
+#endif
+	}
+
+	return error;
+}
+
+/**
+ * svc_register - register an RPC service with the local portmapper
+ * @serv: svc_serv struct for the service to register
+ * @net: net namespace for the service to register
+ * @family: protocol family of service's listener socket
+ * @proto: transport protocol number to advertise
+ * @port: port to advertise
+ *
+ * Service is registered for any address in the passed-in protocol family
+ */
+int svc_register(const struct svc_serv *serv, struct net *net,
+		 const int family, const unsigned short proto,
+		 const unsigned short port)
+{
+	struct svc_program	*progp;
+	struct svc_version	*vers;
+	unsigned int		i;
+	int			error = 0;
+
+	WARN_ON_ONCE(proto == 0 && port == 0);
+	if (proto == 0 && port == 0)
+		return -EINVAL;
+
+	for (progp = serv->sv_program; progp; progp = progp->pg_next) {
+		for (i = 0; i < progp->pg_nvers; i++) {
+			vers = progp->pg_vers[i];
+			if (vers == NULL)
+				continue;
+
+			dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
+					progp->pg_name,
+					i,
+					proto == IPPROTO_UDP?  "udp" : "tcp",
+					port,
+					family,
+					vers->vs_hidden ?
+					" (but not telling portmap)" : "");
+
+			if (vers->vs_hidden)
+				continue;
+
+			error = __svc_register(net, progp->pg_name, progp->pg_prog,
+						i, family, proto, port);
+
+			if (vers->vs_rpcb_optnl) {
+				error = 0;
+				continue;
+			}
+
+			if (error < 0) {
+				printk(KERN_WARNING "svc: failed to register "
+					"%sv%u RPC service (errno %d).\n",
+					progp->pg_name, i, -error);
+				break;
+			}
+		}
+	}
+
+	return error;
+}
+
+/*
+ * If user space is running rpcbind, it should take the v4 UNSET
+ * and clear everything for this [program, version].  If user space
+ * is running portmap, it will reject the v4 UNSET, but won't have
+ * any "inet6" entries anyway.  So a PMAP_UNSET should be sufficient
+ * in this case to clear all existing entries for [program, version].
+ */
+static void __svc_unregister(struct net *net, const u32 program, const u32 version,
+			     const char *progname)
+{
+	int error;
+
+	error = rpcb_v4_register(net, program, version, NULL, "");
+
+	/*
+	 * User space didn't support rpcbind v4, so retry this
+	 * request with the legacy rpcbind v2 protocol.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = rpcb_register(net, program, version, 0, 0);
+
+	dprintk("svc: %s(%sv%u), error %d\n",
+			__func__, progname, version, error);
+}
+
+/*
+ * All netids, bind addresses and ports registered for [program, version]
+ * are removed from the local rpcbind database (if the service is not
+ * hidden) to make way for a new instance of the service.
+ *
+ * The result of unregistration is reported via dprintk for those who want
+ * verification of the result, but is otherwise not important.
+ */
+static void svc_unregister(const struct svc_serv *serv, struct net *net)
+{
+	struct svc_program *progp;
+	unsigned long flags;
+	unsigned int i;
+
+	clear_thread_flag(TIF_SIGPENDING);
+
+	for (progp = serv->sv_program; progp; progp = progp->pg_next) {
+		for (i = 0; i < progp->pg_nvers; i++) {
+			if (progp->pg_vers[i] == NULL)
+				continue;
+			if (progp->pg_vers[i]->vs_hidden)
+				continue;
+
+			dprintk("svc: attempting to unregister %sv%u\n",
+				progp->pg_name, i);
+			__svc_unregister(net, progp->pg_prog, i, progp->pg_name);
+		}
+	}
+
+	spin_lock_irqsave(&current->sighand->siglock, flags);
+	recalc_sigpending();
+	spin_unlock_irqrestore(&current->sighand->siglock, flags);
+}
+
+/*
+ * dprintk the given error with the address of the client that caused it.
+ */
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+static __printf(2, 3)
+void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+	char 	buf[RPC_MAX_ADDRBUFLEN];
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	dprintk("svc: %s: %pV", svc_print_addr(rqstp, buf, sizeof(buf)), &vaf);
+
+	va_end(args);
+}
+#else
+static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
+#endif
+
+/*
+ * Common routine for processing the RPC request.
+ */
+static int
+svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
+{
+	struct svc_program	*progp;
+	struct svc_version	*versp = NULL;	/* compiler food */
+	struct svc_procedure	*procp = NULL;
+	struct svc_serv		*serv = rqstp->rq_server;
+	kxdrproc_t		xdr;
+	__be32			*statp;
+	u32			prog, vers, proc;
+	__be32			auth_stat, rpc_stat;
+	int			auth_res;
+	__be32			*reply_statp;
+
+	rpc_stat = rpc_success;
+
+	if (argv->iov_len < 6*4)
+		goto err_short_len;
+
+	/* Will be turned off only in gss privacy case: */
+	set_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
+	/* Will be turned off only when NFSv4 Sessions are used */
+	set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
+	clear_bit(RQ_DROPME, &rqstp->rq_flags);
+
+	/* Setup reply header */
+	rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
+
+	svc_putu32(resv, rqstp->rq_xid);
+
+	vers = svc_getnl(argv);
+
+	/* First words of reply: */
+	svc_putnl(resv, 1);		/* REPLY */
+
+	if (vers != 2)		/* RPC version number */
+		goto err_bad_rpc;
+
+	/* Save position in case we later decide to reject: */
+	reply_statp = resv->iov_base + resv->iov_len;
+
+	svc_putnl(resv, 0);		/* ACCEPT */
+
+	rqstp->rq_prog = prog = svc_getnl(argv);	/* program number */
+	rqstp->rq_vers = vers = svc_getnl(argv);	/* version number */
+	rqstp->rq_proc = proc = svc_getnl(argv);	/* procedure number */
+
+	for (progp = serv->sv_program; progp; progp = progp->pg_next)
+		if (prog == progp->pg_prog)
+			break;
+
+	/*
+	 * Decode auth data, and add verifier to reply buffer.
+	 * We do this before anything else in order to get a decent
+	 * auth verifier.
+	 */
+	auth_res = svc_authenticate(rqstp, &auth_stat);
+	/* Also give the program a chance to reject this call: */
+	if (auth_res == SVC_OK && progp) {
+		auth_stat = rpc_autherr_badcred;
+		auth_res = progp->pg_authenticate(rqstp);
+	}
+	switch (auth_res) {
+	case SVC_OK:
+		break;
+	case SVC_GARBAGE:
+		goto err_garbage;
+	case SVC_SYSERR:
+		rpc_stat = rpc_system_err;
+		goto err_bad;
+	case SVC_DENIED:
+		goto err_bad_auth;
+	case SVC_CLOSE:
+		if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
+			svc_close_xprt(rqstp->rq_xprt);
+	case SVC_DROP:
+		goto dropit;
+	case SVC_COMPLETE:
+		goto sendit;
+	}
+
+	if (progp == NULL)
+		goto err_bad_prog;
+
+	if (vers >= progp->pg_nvers ||
+	  !(versp = progp->pg_vers[vers]))
+		goto err_bad_vers;
+
+	procp = versp->vs_proc + proc;
+	if (proc >= versp->vs_nproc || !procp->pc_func)
+		goto err_bad_proc;
+	rqstp->rq_procinfo = procp;
+
+	/* Syntactic check complete */
+	serv->sv_stats->rpccnt++;
+
+	/* Build the reply header. */
+	statp = resv->iov_base +resv->iov_len;
+	svc_putnl(resv, RPC_SUCCESS);
+
+	/* Bump per-procedure stats counter */
+	procp->pc_count++;
+
+	/* Initialize storage for argp and resp */
+	memset(rqstp->rq_argp, 0, procp->pc_argsize);
+	memset(rqstp->rq_resp, 0, procp->pc_ressize);
+
+	/* un-reserve some of the out-queue now that we have a
+	 * better idea of reply size
+	 */
+	if (procp->pc_xdrressize)
+		svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
+
+	/* Call the function that processes the request. */
+	if (!versp->vs_dispatch) {
+		/* Decode arguments */
+		xdr = procp->pc_decode;
+		if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
+			goto err_garbage;
+
+		*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+
+		/* Encode reply */
+		if (test_bit(RQ_DROPME, &rqstp->rq_flags)) {
+			if (procp->pc_release)
+				procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+			goto dropit;
+		}
+		if (*statp == rpc_success &&
+		    (xdr = procp->pc_encode) &&
+		    !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
+			dprintk("svc: failed to encode reply\n");
+			/* serv->sv_stats->rpcsystemerr++; */
+			*statp = rpc_system_err;
+		}
+	} else {
+		dprintk("svc: calling dispatcher\n");
+		if (!versp->vs_dispatch(rqstp, statp)) {
+			/* Release reply info */
+			if (procp->pc_release)
+				procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+			goto dropit;
+		}
+	}
+
+	/* Check RPC status result */
+	if (*statp != rpc_success)
+		resv->iov_len = ((void*)statp)  - resv->iov_base + 4;
+
+	/* Release reply info */
+	if (procp->pc_release)
+		procp->pc_release(rqstp, NULL, rqstp->rq_resp);
+
+	if (procp->pc_encode == NULL)
+		goto dropit;
+
+ sendit:
+	if (svc_authorise(rqstp))
+		goto dropit;
+	return 1;		/* Caller can now send it */
+
+ dropit:
+	svc_authorise(rqstp);	/* doesn't hurt to call this twice */
+	dprintk("svc: svc_process dropit\n");
+	return 0;
+
+err_short_len:
+	svc_printk(rqstp, "short len %Zd, dropping request\n",
+			argv->iov_len);
+
+	goto dropit;			/* drop request */
+
+err_bad_rpc:
+	serv->sv_stats->rpcbadfmt++;
+	svc_putnl(resv, 1);	/* REJECT */
+	svc_putnl(resv, 0);	/* RPC_MISMATCH */
+	svc_putnl(resv, 2);	/* Only RPCv2 supported */
+	svc_putnl(resv, 2);
+	goto sendit;
+
+err_bad_auth:
+	dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
+	serv->sv_stats->rpcbadauth++;
+	/* Restore write pointer to location of accept status: */
+	xdr_ressize_check(rqstp, reply_statp);
+	svc_putnl(resv, 1);	/* REJECT */
+	svc_putnl(resv, 1);	/* AUTH_ERROR */
+	svc_putnl(resv, ntohl(auth_stat));	/* status */
+	goto sendit;
+
+err_bad_prog:
+	dprintk("svc: unknown program %d\n", prog);
+	serv->sv_stats->rpcbadfmt++;
+	svc_putnl(resv, RPC_PROG_UNAVAIL);
+	goto sendit;
+
+err_bad_vers:
+	svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
+		       vers, prog, progp->pg_name);
+
+	serv->sv_stats->rpcbadfmt++;
+	svc_putnl(resv, RPC_PROG_MISMATCH);
+	svc_putnl(resv, progp->pg_lovers);
+	svc_putnl(resv, progp->pg_hivers);
+	goto sendit;
+
+err_bad_proc:
+	svc_printk(rqstp, "unknown procedure (%d)\n", proc);
+
+	serv->sv_stats->rpcbadfmt++;
+	svc_putnl(resv, RPC_PROC_UNAVAIL);
+	goto sendit;
+
+err_garbage:
+	svc_printk(rqstp, "failed to decode args\n");
+
+	rpc_stat = rpc_garbage_args;
+err_bad:
+	serv->sv_stats->rpcbadfmt++;
+	svc_putnl(resv, ntohl(rpc_stat));
+	goto sendit;
+}
+EXPORT_SYMBOL_GPL(svc_process);
+
+/*
+ * Process the RPC request.
+ */
+int
+svc_process(struct svc_rqst *rqstp)
+{
+	struct kvec		*argv = &rqstp->rq_arg.head[0];
+	struct kvec		*resv = &rqstp->rq_res.head[0];
+	struct svc_serv		*serv = rqstp->rq_server;
+	u32			dir;
+
+	/*
+	 * Setup response xdr_buf.
+	 * Initially it has just one page
+	 */
+	rqstp->rq_next_page = &rqstp->rq_respages[1];
+	resv->iov_base = page_address(rqstp->rq_respages[0]);
+	resv->iov_len = 0;
+	rqstp->rq_res.pages = rqstp->rq_respages + 1;
+	rqstp->rq_res.len = 0;
+	rqstp->rq_res.page_base = 0;
+	rqstp->rq_res.page_len = 0;
+	rqstp->rq_res.buflen = PAGE_SIZE;
+	rqstp->rq_res.tail[0].iov_base = NULL;
+	rqstp->rq_res.tail[0].iov_len = 0;
+
+	dir  = svc_getnl(argv);
+	if (dir != 0) {
+		/* direction != CALL */
+		svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
+		serv->sv_stats->rpcbadfmt++;
+		goto out_drop;
+	}
+
+	/* Returns 1 for send, 0 for drop */
+	if (likely(svc_process_common(rqstp, argv, resv))) {
+		int ret = svc_send(rqstp);
+
+		trace_svc_process(rqstp, ret);
+		return ret;
+	}
+out_drop:
+	trace_svc_process(rqstp, 0);
+	svc_drop(rqstp);
+	return 0;
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Process a backchannel RPC request that arrived over an existing
+ * outbound connection
+ */
+int
+bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
+	       struct svc_rqst *rqstp)
+{
+	struct kvec	*argv = &rqstp->rq_arg.head[0];
+	struct kvec	*resv = &rqstp->rq_res.head[0];
+
+	/* Build the svc_rqst used by the common processing routine */
+	rqstp->rq_xprt = serv->sv_bc_xprt;
+	rqstp->rq_xid = req->rq_xid;
+	rqstp->rq_prot = req->rq_xprt->prot;
+	rqstp->rq_server = serv;
+
+	rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
+	memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
+	memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
+	memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
+
+	/* reset result send buffer "put" position */
+	resv->iov_len = 0;
+
+	if (rqstp->rq_prot != IPPROTO_TCP) {
+		printk(KERN_ERR "No support for Non-TCP transports!\n");
+		BUG();
+	}
+
+	/*
+	 * Skip the next two words because they've already been
+	 * processed in the trasport
+	 */
+	svc_getu32(argv);	/* XID */
+	svc_getnl(argv);	/* CALLDIR */
+
+	/* Returns 1 for send, 0 for drop */
+	if (svc_process_common(rqstp, argv, resv)) {
+		memcpy(&req->rq_snd_buf, &rqstp->rq_res,
+						sizeof(req->rq_snd_buf));
+		return bc_send(req);
+	} else {
+		/* drop request */
+		xprt_free_bc_request(req);
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(bc_svc_process);
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+/*
+ * Return (transport-specific) limit on the rpc payload.
+ */
+u32 svc_max_payload(const struct svc_rqst *rqstp)
+{
+	u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
+
+	if (rqstp->rq_server->sv_max_payload < max)
+		max = rqstp->rq_server->sv_max_payload;
+	return max;
+}
+EXPORT_SYMBOL_GPL(svc_max_payload);
diff --git a/kernel/net/sunrpc/svc_xprt.c b/kernel/net/sunrpc/svc_xprt.c
new file mode 100644
index 000000000..ba2313cd4
--- /dev/null
+++ b/kernel/net/sunrpc/svc_xprt.c
@@ -0,0 +1,1371 @@
+/*
+ * linux/net/sunrpc/svc_xprt.c
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/module.h>
+#include <trace/events/sunrpc.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt);
+static int svc_deferred_recv(struct svc_rqst *rqstp);
+static struct cache_deferred_req *svc_defer(struct cache_req *req);
+static void svc_age_temp_xprts(unsigned long closure);
+static void svc_delete_xprt(struct svc_xprt *xprt);
+static void svc_xprt_do_enqueue(struct svc_xprt *xprt);
+
+/* apparently the "standard" is that clients close
+ * idle connections after 5 minutes, servers after
+ * 6 minutes
+ *   http://www.connectathon.org/talks96/nfstcp.pdf
+ */
+static int svc_conn_age_period = 6*60;
+
+/* List of registered transport classes */
+static DEFINE_SPINLOCK(svc_xprt_class_lock);
+static LIST_HEAD(svc_xprt_class_list);
+
+/* SMP locking strategy:
+ *
+ *	svc_pool->sp_lock protects most of the fields of that pool.
+ *	svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt.
+ *	when both need to be taken (rare), svc_serv->sv_lock is first.
+ *	The "service mutex" protects svc_serv->sv_nrthread.
+ *	svc_sock->sk_lock protects the svc_sock->sk_deferred list
+ *             and the ->sk_info_authunix cache.
+ *
+ *	The XPT_BUSY bit in xprt->xpt_flags prevents a transport being
+ *	enqueued multiply. During normal transport processing this bit
+ *	is set by svc_xprt_enqueue and cleared by svc_xprt_received.
+ *	Providers should not manipulate this bit directly.
+ *
+ *	Some flags can be set to certain values at any time
+ *	providing that certain rules are followed:
+ *
+ *	XPT_CONN, XPT_DATA:
+ *		- Can be set or cleared at any time.
+ *		- After a set, svc_xprt_enqueue must be called to enqueue
+ *		  the transport for processing.
+ *		- After a clear, the transport must be read/accepted.
+ *		  If this succeeds, it must be set again.
+ *	XPT_CLOSE:
+ *		- Can set at any time. It is never cleared.
+ *      XPT_DEAD:
+ *		- Can only be set while XPT_BUSY is held which ensures
+ *		  that no other thread will be using the transport or will
+ *		  try to set XPT_DEAD.
+ */
+int svc_reg_xprt_class(struct svc_xprt_class *xcl)
+{
+	struct svc_xprt_class *cl;
+	int res = -EEXIST;
+
+	dprintk("svc: Adding svc transport class '%s'\n", xcl->xcl_name);
+
+	INIT_LIST_HEAD(&xcl->xcl_list);
+	spin_lock(&svc_xprt_class_lock);
+	/* Make sure there isn't already a class with the same name */
+	list_for_each_entry(cl, &svc_xprt_class_list, xcl_list) {
+		if (strcmp(xcl->xcl_name, cl->xcl_name) == 0)
+			goto out;
+	}
+	list_add_tail(&xcl->xcl_list, &svc_xprt_class_list);
+	res = 0;
+out:
+	spin_unlock(&svc_xprt_class_lock);
+	return res;
+}
+EXPORT_SYMBOL_GPL(svc_reg_xprt_class);
+
+void svc_unreg_xprt_class(struct svc_xprt_class *xcl)
+{
+	dprintk("svc: Removing svc transport class '%s'\n", xcl->xcl_name);
+	spin_lock(&svc_xprt_class_lock);
+	list_del_init(&xcl->xcl_list);
+	spin_unlock(&svc_xprt_class_lock);
+}
+EXPORT_SYMBOL_GPL(svc_unreg_xprt_class);
+
+/*
+ * Format the transport list for printing
+ */
+int svc_print_xprts(char *buf, int maxlen)
+{
+	struct svc_xprt_class *xcl;
+	char tmpstr[80];
+	int len = 0;
+	buf[0] = '\0';
+
+	spin_lock(&svc_xprt_class_lock);
+	list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
+		int slen;
+
+		sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload);
+		slen = strlen(tmpstr);
+		if (len + slen > maxlen)
+			break;
+		len += slen;
+		strcat(buf, tmpstr);
+	}
+	spin_unlock(&svc_xprt_class_lock);
+
+	return len;
+}
+
+static void svc_xprt_free(struct kref *kref)
+{
+	struct svc_xprt *xprt =
+		container_of(kref, struct svc_xprt, xpt_ref);
+	struct module *owner = xprt->xpt_class->xcl_owner;
+	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags))
+		svcauth_unix_info_release(xprt);
+	put_net(xprt->xpt_net);
+	/* See comment on corresponding get in xs_setup_bc_tcp(): */
+	if (xprt->xpt_bc_xprt)
+		xprt_put(xprt->xpt_bc_xprt);
+	xprt->xpt_ops->xpo_free(xprt);
+	module_put(owner);
+}
+
+void svc_xprt_put(struct svc_xprt *xprt)
+{
+	kref_put(&xprt->xpt_ref, svc_xprt_free);
+}
+EXPORT_SYMBOL_GPL(svc_xprt_put);
+
+/*
+ * Called by transport drivers to initialize the transport independent
+ * portion of the transport instance.
+ */
+void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl,
+		   struct svc_xprt *xprt, struct svc_serv *serv)
+{
+	memset(xprt, 0, sizeof(*xprt));
+	xprt->xpt_class = xcl;
+	xprt->xpt_ops = xcl->xcl_ops;
+	kref_init(&xprt->xpt_ref);
+	xprt->xpt_server = serv;
+	INIT_LIST_HEAD(&xprt->xpt_list);
+	INIT_LIST_HEAD(&xprt->xpt_ready);
+	INIT_LIST_HEAD(&xprt->xpt_deferred);
+	INIT_LIST_HEAD(&xprt->xpt_users);
+	mutex_init(&xprt->xpt_mutex);
+	spin_lock_init(&xprt->xpt_lock);
+	set_bit(XPT_BUSY, &xprt->xpt_flags);
+	rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending");
+	xprt->xpt_net = get_net(net);
+}
+EXPORT_SYMBOL_GPL(svc_xprt_init);
+
+static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl,
+					 struct svc_serv *serv,
+					 struct net *net,
+					 const int family,
+					 const unsigned short port,
+					 int flags)
+{
+	struct sockaddr_in sin = {
+		.sin_family		= AF_INET,
+		.sin_addr.s_addr	= htonl(INADDR_ANY),
+		.sin_port		= htons(port),
+	};
+#if IS_ENABLED(CONFIG_IPV6)
+	struct sockaddr_in6 sin6 = {
+		.sin6_family		= AF_INET6,
+		.sin6_addr		= IN6ADDR_ANY_INIT,
+		.sin6_port		= htons(port),
+	};
+#endif
+	struct sockaddr *sap;
+	size_t len;
+
+	switch (family) {
+	case PF_INET:
+		sap = (struct sockaddr *)&sin;
+		len = sizeof(sin);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case PF_INET6:
+		sap = (struct sockaddr *)&sin6;
+		len = sizeof(sin6);
+		break;
+#endif
+	default:
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
+	return xcl->xcl_ops->xpo_create(serv, net, sap, len, flags);
+}
+
+/*
+ * svc_xprt_received conditionally queues the transport for processing
+ * by another thread. The caller must hold the XPT_BUSY bit and must
+ * not thereafter touch transport data.
+ *
+ * Note: XPT_DATA only gets cleared when a read-attempt finds no (or
+ * insufficient) data.
+ */
+static void svc_xprt_received(struct svc_xprt *xprt)
+{
+	if (!test_bit(XPT_BUSY, &xprt->xpt_flags)) {
+		WARN_ONCE(1, "xprt=0x%p already busy!", xprt);
+		return;
+	}
+
+	/* As soon as we clear busy, the xprt could be closed and
+	 * 'put', so we need a reference to call svc_xprt_do_enqueue with:
+	 */
+	svc_xprt_get(xprt);
+	smp_mb__before_atomic();
+	clear_bit(XPT_BUSY, &xprt->xpt_flags);
+	svc_xprt_do_enqueue(xprt);
+	svc_xprt_put(xprt);
+}
+
+void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *new)
+{
+	clear_bit(XPT_TEMP, &new->xpt_flags);
+	spin_lock_bh(&serv->sv_lock);
+	list_add(&new->xpt_list, &serv->sv_permsocks);
+	spin_unlock_bh(&serv->sv_lock);
+	svc_xprt_received(new);
+}
+
+int svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
+		    struct net *net, const int family,
+		    const unsigned short port, int flags)
+{
+	struct svc_xprt_class *xcl;
+
+	dprintk("svc: creating transport %s[%d]\n", xprt_name, port);
+	spin_lock(&svc_xprt_class_lock);
+	list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
+		struct svc_xprt *newxprt;
+		unsigned short newport;
+
+		if (strcmp(xprt_name, xcl->xcl_name))
+			continue;
+
+		if (!try_module_get(xcl->xcl_owner))
+			goto err;
+
+		spin_unlock(&svc_xprt_class_lock);
+		newxprt = __svc_xpo_create(xcl, serv, net, family, port, flags);
+		if (IS_ERR(newxprt)) {
+			module_put(xcl->xcl_owner);
+			return PTR_ERR(newxprt);
+		}
+		svc_add_new_perm_xprt(serv, newxprt);
+		newport = svc_xprt_local_port(newxprt);
+		return newport;
+	}
+ err:
+	spin_unlock(&svc_xprt_class_lock);
+	dprintk("svc: transport %s not found\n", xprt_name);
+
+	/* This errno is exposed to user space.  Provide a reasonable
+	 * perror msg for a bad transport. */
+	return -EPROTONOSUPPORT;
+}
+EXPORT_SYMBOL_GPL(svc_create_xprt);
+
+/*
+ * Copy the local and remote xprt addresses to the rqstp structure
+ */
+void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
+{
+	memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen);
+	rqstp->rq_addrlen = xprt->xpt_remotelen;
+
+	/*
+	 * Destination address in request is needed for binding the
+	 * source address in RPC replies/callbacks later.
+	 */
+	memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen);
+	rqstp->rq_daddrlen = xprt->xpt_locallen;
+}
+EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs);
+
+/**
+ * svc_print_addr - Format rq_addr field for printing
+ * @rqstp: svc_rqst struct containing address to print
+ * @buf: target buffer for formatted address
+ * @len: length of target buffer
+ *
+ */
+char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len)
+{
+	return __svc_print_addr(svc_addr(rqstp), buf, len);
+}
+EXPORT_SYMBOL_GPL(svc_print_addr);
+
+static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt)
+{
+	if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE)))
+		return true;
+	if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED)))
+		return xprt->xpt_ops->xpo_has_wspace(xprt);
+	return false;
+}
+
+static void svc_xprt_do_enqueue(struct svc_xprt *xprt)
+{
+	struct svc_pool *pool;
+	struct svc_rqst	*rqstp = NULL;
+	int cpu;
+	bool queued = false;
+
+	if (!svc_xprt_has_something_to_do(xprt))
+		goto out;
+
+	/* Mark transport as busy. It will remain in this state until
+	 * the provider calls svc_xprt_received. We update XPT_BUSY
+	 * atomically because it also guards against trying to enqueue
+	 * the transport twice.
+	 */
+	if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) {
+		/* Don't enqueue transport while already enqueued */
+		dprintk("svc: transport %p busy, not enqueued\n", xprt);
+		goto out;
+	}
+
+	cpu = get_cpu_light();
+	pool = svc_pool_for_cpu(xprt->xpt_server, cpu);
+
+	atomic_long_inc(&pool->sp_stats.packets);
+
+redo_search:
+	/* find a thread for this xprt */
+	rcu_read_lock();
+	list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) {
+		/* Do a lockless check first */
+		if (test_bit(RQ_BUSY, &rqstp->rq_flags))
+			continue;
+
+		/*
+		 * Once the xprt has been queued, it can only be dequeued by
+		 * the task that intends to service it. All we can do at that
+		 * point is to try to wake this thread back up so that it can
+		 * do so.
+		 */
+		if (!queued) {
+			spin_lock_bh(&rqstp->rq_lock);
+			if (test_and_set_bit(RQ_BUSY, &rqstp->rq_flags)) {
+				/* already busy, move on... */
+				spin_unlock_bh(&rqstp->rq_lock);
+				continue;
+			}
+
+			/* this one will do */
+			rqstp->rq_xprt = xprt;
+			svc_xprt_get(xprt);
+			spin_unlock_bh(&rqstp->rq_lock);
+		}
+		rcu_read_unlock();
+
+		atomic_long_inc(&pool->sp_stats.threads_woken);
+		wake_up_process(rqstp->rq_task);
+		put_cpu_light();
+		goto out;
+	}
+	rcu_read_unlock();
+
+	/*
+	 * We didn't find an idle thread to use, so we need to queue the xprt.
+	 * Do so and then search again. If we find one, we can't hook this one
+	 * up to it directly but we can wake the thread up in the hopes that it
+	 * will pick it up once it searches for a xprt to service.
+	 */
+	if (!queued) {
+		queued = true;
+		dprintk("svc: transport %p put into queue\n", xprt);
+		spin_lock_bh(&pool->sp_lock);
+		list_add_tail(&xprt->xpt_ready, &pool->sp_sockets);
+		pool->sp_stats.sockets_queued++;
+		spin_unlock_bh(&pool->sp_lock);
+		goto redo_search;
+	}
+	rqstp = NULL;
+	put_cpu_light();
+out:
+	trace_svc_xprt_do_enqueue(xprt, rqstp);
+}
+
+/*
+ * Queue up a transport with data pending. If there are idle nfsd
+ * processes, wake 'em up.
+ *
+ */
+void svc_xprt_enqueue(struct svc_xprt *xprt)
+{
+	if (test_bit(XPT_BUSY, &xprt->xpt_flags))
+		return;
+	svc_xprt_do_enqueue(xprt);
+}
+EXPORT_SYMBOL_GPL(svc_xprt_enqueue);
+
+/*
+ * Dequeue the first transport, if there is one.
+ */
+static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool)
+{
+	struct svc_xprt	*xprt = NULL;
+
+	if (list_empty(&pool->sp_sockets))
+		goto out;
+
+	spin_lock_bh(&pool->sp_lock);
+	if (likely(!list_empty(&pool->sp_sockets))) {
+		xprt = list_first_entry(&pool->sp_sockets,
+					struct svc_xprt, xpt_ready);
+		list_del_init(&xprt->xpt_ready);
+		svc_xprt_get(xprt);
+
+		dprintk("svc: transport %p dequeued, inuse=%d\n",
+			xprt, atomic_read(&xprt->xpt_ref.refcount));
+	}
+	spin_unlock_bh(&pool->sp_lock);
+out:
+	trace_svc_xprt_dequeue(xprt);
+	return xprt;
+}
+
+/**
+ * svc_reserve - change the space reserved for the reply to a request.
+ * @rqstp:  The request in question
+ * @space: new max space to reserve
+ *
+ * Each request reserves some space on the output queue of the transport
+ * to make sure the reply fits.  This function reduces that reserved
+ * space to be the amount of space used already, plus @space.
+ *
+ */
+void svc_reserve(struct svc_rqst *rqstp, int space)
+{
+	space += rqstp->rq_res.head[0].iov_len;
+
+	if (space < rqstp->rq_reserved) {
+		struct svc_xprt *xprt = rqstp->rq_xprt;
+		atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved);
+		rqstp->rq_reserved = space;
+
+		if (xprt->xpt_ops->xpo_adjust_wspace)
+			xprt->xpt_ops->xpo_adjust_wspace(xprt);
+		svc_xprt_enqueue(xprt);
+	}
+}
+EXPORT_SYMBOL_GPL(svc_reserve);
+
+static void svc_xprt_release(struct svc_rqst *rqstp)
+{
+	struct svc_xprt	*xprt = rqstp->rq_xprt;
+
+	rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
+
+	kfree(rqstp->rq_deferred);
+	rqstp->rq_deferred = NULL;
+
+	svc_free_res_pages(rqstp);
+	rqstp->rq_res.page_len = 0;
+	rqstp->rq_res.page_base = 0;
+
+	/* Reset response buffer and release
+	 * the reservation.
+	 * But first, check that enough space was reserved
+	 * for the reply, otherwise we have a bug!
+	 */
+	if ((rqstp->rq_res.len) >  rqstp->rq_reserved)
+		printk(KERN_ERR "RPC request reserved %d but used %d\n",
+		       rqstp->rq_reserved,
+		       rqstp->rq_res.len);
+
+	rqstp->rq_res.head[0].iov_len = 0;
+	svc_reserve(rqstp, 0);
+	rqstp->rq_xprt = NULL;
+
+	svc_xprt_put(xprt);
+}
+
+/*
+ * Some svc_serv's will have occasional work to do, even when a xprt is not
+ * waiting to be serviced. This function is there to "kick" a task in one of
+ * those services so that it can wake up and do that work. Note that we only
+ * bother with pool 0 as we don't need to wake up more than one thread for
+ * this purpose.
+ */
+void svc_wake_up(struct svc_serv *serv)
+{
+	struct svc_rqst	*rqstp;
+	struct svc_pool *pool;
+
+	pool = &serv->sv_pools[0];
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(rqstp, &pool->sp_all_threads, rq_all) {
+		/* skip any that aren't queued */
+		if (test_bit(RQ_BUSY, &rqstp->rq_flags))
+			continue;
+		rcu_read_unlock();
+		dprintk("svc: daemon %p woken up.\n", rqstp);
+		wake_up_process(rqstp->rq_task);
+		trace_svc_wake_up(rqstp->rq_task->pid);
+		return;
+	}
+	rcu_read_unlock();
+
+	/* No free entries available */
+	set_bit(SP_TASK_PENDING, &pool->sp_flags);
+	smp_wmb();
+	trace_svc_wake_up(0);
+}
+EXPORT_SYMBOL_GPL(svc_wake_up);
+
+int svc_port_is_privileged(struct sockaddr *sin)
+{
+	switch (sin->sa_family) {
+	case AF_INET:
+		return ntohs(((struct sockaddr_in *)sin)->sin_port)
+			< PROT_SOCK;
+	case AF_INET6:
+		return ntohs(((struct sockaddr_in6 *)sin)->sin6_port)
+			< PROT_SOCK;
+	default:
+		return 0;
+	}
+}
+
+/*
+ * Make sure that we don't have too many active connections. If we have,
+ * something must be dropped. It's not clear what will happen if we allow
+ * "too many" connections, but when dealing with network-facing software,
+ * we have to code defensively. Here we do that by imposing hard limits.
+ *
+ * There's no point in trying to do random drop here for DoS
+ * prevention. The NFS clients does 1 reconnect in 15 seconds. An
+ * attacker can easily beat that.
+ *
+ * The only somewhat efficient mechanism would be if drop old
+ * connections from the same IP first. But right now we don't even
+ * record the client IP in svc_sock.
+ *
+ * single-threaded services that expect a lot of clients will probably
+ * need to set sv_maxconn to override the default value which is based
+ * on the number of threads
+ */
+static void svc_check_conn_limits(struct svc_serv *serv)
+{
+	unsigned int limit = serv->sv_maxconn ? serv->sv_maxconn :
+				(serv->sv_nrthreads+3) * 20;
+
+	if (serv->sv_tmpcnt > limit) {
+		struct svc_xprt *xprt = NULL;
+		spin_lock_bh(&serv->sv_lock);
+		if (!list_empty(&serv->sv_tempsocks)) {
+			/* Try to help the admin */
+			net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n",
+					       serv->sv_name, serv->sv_maxconn ?
+					       "max number of connections" :
+					       "number of threads");
+			/*
+			 * Always select the oldest connection. It's not fair,
+			 * but so is life
+			 */
+			xprt = list_entry(serv->sv_tempsocks.prev,
+					  struct svc_xprt,
+					  xpt_list);
+			set_bit(XPT_CLOSE, &xprt->xpt_flags);
+			svc_xprt_get(xprt);
+		}
+		spin_unlock_bh(&serv->sv_lock);
+
+		if (xprt) {
+			svc_xprt_enqueue(xprt);
+			svc_xprt_put(xprt);
+		}
+	}
+}
+
+static int svc_alloc_arg(struct svc_rqst *rqstp)
+{
+	struct svc_serv *serv = rqstp->rq_server;
+	struct xdr_buf *arg;
+	int pages;
+	int i;
+
+	/* now allocate needed pages.  If we get a failure, sleep briefly */
+	pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE;
+	WARN_ON_ONCE(pages >= RPCSVC_MAXPAGES);
+	if (pages >= RPCSVC_MAXPAGES)
+		/* use as many pages as possible */
+		pages = RPCSVC_MAXPAGES - 1;
+	for (i = 0; i < pages ; i++)
+		while (rqstp->rq_pages[i] == NULL) {
+			struct page *p = alloc_page(GFP_KERNEL);
+			if (!p) {
+				set_current_state(TASK_INTERRUPTIBLE);
+				if (signalled() || kthread_should_stop()) {
+					set_current_state(TASK_RUNNING);
+					return -EINTR;
+				}
+				schedule_timeout(msecs_to_jiffies(500));
+			}
+			rqstp->rq_pages[i] = p;
+		}
+	rqstp->rq_page_end = &rqstp->rq_pages[i];
+	rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */
+
+	/* Make arg->head point to first page and arg->pages point to rest */
+	arg = &rqstp->rq_arg;
+	arg->head[0].iov_base = page_address(rqstp->rq_pages[0]);
+	arg->head[0].iov_len = PAGE_SIZE;
+	arg->pages = rqstp->rq_pages + 1;
+	arg->page_base = 0;
+	/* save at least one page for response */
+	arg->page_len = (pages-2)*PAGE_SIZE;
+	arg->len = (pages-1)*PAGE_SIZE;
+	arg->tail[0].iov_len = 0;
+	return 0;
+}
+
+static bool
+rqst_should_sleep(struct svc_rqst *rqstp)
+{
+	struct svc_pool		*pool = rqstp->rq_pool;
+
+	/* did someone call svc_wake_up? */
+	if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags))
+		return false;
+
+	/* was a socket queued? */
+	if (!list_empty(&pool->sp_sockets))
+		return false;
+
+	/* are we shutting down? */
+	if (signalled() || kthread_should_stop())
+		return false;
+
+	/* are we freezing? */
+	if (freezing(current))
+		return false;
+
+	return true;
+}
+
+static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
+{
+	struct svc_xprt *xprt;
+	struct svc_pool		*pool = rqstp->rq_pool;
+	long			time_left = 0;
+
+	/* rq_xprt should be clear on entry */
+	WARN_ON_ONCE(rqstp->rq_xprt);
+
+	/* Normally we will wait up to 5 seconds for any required
+	 * cache information to be provided.
+	 */
+	rqstp->rq_chandle.thread_wait = 5*HZ;
+
+	xprt = svc_xprt_dequeue(pool);
+	if (xprt) {
+		rqstp->rq_xprt = xprt;
+
+		/* As there is a shortage of threads and this request
+		 * had to be queued, don't allow the thread to wait so
+		 * long for cache updates.
+		 */
+		rqstp->rq_chandle.thread_wait = 1*HZ;
+		clear_bit(SP_TASK_PENDING, &pool->sp_flags);
+		return xprt;
+	}
+
+	/*
+	 * We have to be able to interrupt this wait
+	 * to bring down the daemons ...
+	 */
+	set_current_state(TASK_INTERRUPTIBLE);
+	clear_bit(RQ_BUSY, &rqstp->rq_flags);
+	smp_mb();
+
+	if (likely(rqst_should_sleep(rqstp)))
+		time_left = schedule_timeout(timeout);
+	else
+		__set_current_state(TASK_RUNNING);
+
+	try_to_freeze();
+
+	spin_lock_bh(&rqstp->rq_lock);
+	set_bit(RQ_BUSY, &rqstp->rq_flags);
+	spin_unlock_bh(&rqstp->rq_lock);
+
+	xprt = rqstp->rq_xprt;
+	if (xprt != NULL)
+		return xprt;
+
+	if (!time_left)
+		atomic_long_inc(&pool->sp_stats.threads_timedout);
+
+	if (signalled() || kthread_should_stop())
+		return ERR_PTR(-EINTR);
+	return ERR_PTR(-EAGAIN);
+}
+
+static void svc_add_new_temp_xprt(struct svc_serv *serv, struct svc_xprt *newxpt)
+{
+	spin_lock_bh(&serv->sv_lock);
+	set_bit(XPT_TEMP, &newxpt->xpt_flags);
+	list_add(&newxpt->xpt_list, &serv->sv_tempsocks);
+	serv->sv_tmpcnt++;
+	if (serv->sv_temptimer.function == NULL) {
+		/* setup timer to age temp transports */
+		setup_timer(&serv->sv_temptimer, svc_age_temp_xprts,
+			    (unsigned long)serv);
+		mod_timer(&serv->sv_temptimer,
+			  jiffies + svc_conn_age_period * HZ);
+	}
+	spin_unlock_bh(&serv->sv_lock);
+	svc_xprt_received(newxpt);
+}
+
+static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt)
+{
+	struct svc_serv *serv = rqstp->rq_server;
+	int len = 0;
+
+	if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) {
+		dprintk("svc_recv: found XPT_CLOSE\n");
+		svc_delete_xprt(xprt);
+		/* Leave XPT_BUSY set on the dead xprt: */
+		goto out;
+	}
+	if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
+		struct svc_xprt *newxpt;
+		/*
+		 * We know this module_get will succeed because the
+		 * listener holds a reference too
+		 */
+		__module_get(xprt->xpt_class->xcl_owner);
+		svc_check_conn_limits(xprt->xpt_server);
+		newxpt = xprt->xpt_ops->xpo_accept(xprt);
+		if (newxpt)
+			svc_add_new_temp_xprt(serv, newxpt);
+		else
+			module_put(xprt->xpt_class->xcl_owner);
+	} else {
+		/* XPT_DATA|XPT_DEFERRED case: */
+		dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",
+			rqstp, rqstp->rq_pool->sp_id, xprt,
+			atomic_read(&xprt->xpt_ref.refcount));
+		rqstp->rq_deferred = svc_deferred_dequeue(xprt);
+		if (rqstp->rq_deferred)
+			len = svc_deferred_recv(rqstp);
+		else
+			len = xprt->xpt_ops->xpo_recvfrom(rqstp);
+		dprintk("svc: got len=%d\n", len);
+		rqstp->rq_reserved = serv->sv_max_mesg;
+		atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved);
+	}
+	/* clear XPT_BUSY: */
+	svc_xprt_received(xprt);
+out:
+	trace_svc_handle_xprt(xprt, len);
+	return len;
+}
+
+/*
+ * Receive the next request on any transport.  This code is carefully
+ * organised not to touch any cachelines in the shared svc_serv
+ * structure, only cachelines in the local svc_pool.
+ */
+int svc_recv(struct svc_rqst *rqstp, long timeout)
+{
+	struct svc_xprt		*xprt = NULL;
+	struct svc_serv		*serv = rqstp->rq_server;
+	int			len, err;
+
+	dprintk("svc: server %p waiting for data (to = %ld)\n",
+		rqstp, timeout);
+
+	if (rqstp->rq_xprt)
+		printk(KERN_ERR
+			"svc_recv: service %p, transport not NULL!\n",
+			 rqstp);
+
+	err = svc_alloc_arg(rqstp);
+	if (err)
+		goto out;
+
+	try_to_freeze();
+	cond_resched();
+	err = -EINTR;
+	if (signalled() || kthread_should_stop())
+		goto out;
+
+	xprt = svc_get_next_xprt(rqstp, timeout);
+	if (IS_ERR(xprt)) {
+		err = PTR_ERR(xprt);
+		goto out;
+	}
+
+	len = svc_handle_xprt(rqstp, xprt);
+
+	/* No data, incomplete (TCP) read, or accept() */
+	err = -EAGAIN;
+	if (len <= 0)
+		goto out_release;
+
+	clear_bit(XPT_OLD, &xprt->xpt_flags);
+
+	if (xprt->xpt_ops->xpo_secure_port(rqstp))
+		set_bit(RQ_SECURE, &rqstp->rq_flags);
+	else
+		clear_bit(RQ_SECURE, &rqstp->rq_flags);
+	rqstp->rq_chandle.defer = svc_defer;
+	rqstp->rq_xid = svc_getu32(&rqstp->rq_arg.head[0]);
+
+	if (serv->sv_stats)
+		serv->sv_stats->netcnt++;
+	trace_svc_recv(rqstp, len);
+	return len;
+out_release:
+	rqstp->rq_res.len = 0;
+	svc_xprt_release(rqstp);
+out:
+	trace_svc_recv(rqstp, err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(svc_recv);
+
+/*
+ * Drop request
+ */
+void svc_drop(struct svc_rqst *rqstp)
+{
+	dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt);
+	svc_xprt_release(rqstp);
+}
+EXPORT_SYMBOL_GPL(svc_drop);
+
+/*
+ * Return reply to client.
+ */
+int svc_send(struct svc_rqst *rqstp)
+{
+	struct svc_xprt	*xprt;
+	int		len = -EFAULT;
+	struct xdr_buf	*xb;
+
+	xprt = rqstp->rq_xprt;
+	if (!xprt)
+		goto out;
+
+	/* release the receive skb before sending the reply */
+	rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
+
+	/* calculate over-all length */
+	xb = &rqstp->rq_res;
+	xb->len = xb->head[0].iov_len +
+		xb->page_len +
+		xb->tail[0].iov_len;
+
+	/* Grab mutex to serialize outgoing data. */
+	mutex_lock(&xprt->xpt_mutex);
+	if (test_bit(XPT_DEAD, &xprt->xpt_flags)
+			|| test_bit(XPT_CLOSE, &xprt->xpt_flags))
+		len = -ENOTCONN;
+	else
+		len = xprt->xpt_ops->xpo_sendto(rqstp);
+	mutex_unlock(&xprt->xpt_mutex);
+	rpc_wake_up(&xprt->xpt_bc_pending);
+	svc_xprt_release(rqstp);
+
+	if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN)
+		len = 0;
+out:
+	trace_svc_send(rqstp, len);
+	return len;
+}
+
+/*
+ * Timer function to close old temporary transports, using
+ * a mark-and-sweep algorithm.
+ */
+static void svc_age_temp_xprts(unsigned long closure)
+{
+	struct svc_serv *serv = (struct svc_serv *)closure;
+	struct svc_xprt *xprt;
+	struct list_head *le, *next;
+
+	dprintk("svc_age_temp_xprts\n");
+
+	if (!spin_trylock_bh(&serv->sv_lock)) {
+		/* busy, try again 1 sec later */
+		dprintk("svc_age_temp_xprts: busy\n");
+		mod_timer(&serv->sv_temptimer, jiffies + HZ);
+		return;
+	}
+
+	list_for_each_safe(le, next, &serv->sv_tempsocks) {
+		xprt = list_entry(le, struct svc_xprt, xpt_list);
+
+		/* First time through, just mark it OLD. Second time
+		 * through, close it. */
+		if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags))
+			continue;
+		if (atomic_read(&xprt->xpt_ref.refcount) > 1 ||
+		    test_bit(XPT_BUSY, &xprt->xpt_flags))
+			continue;
+		list_del_init(le);
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		dprintk("queuing xprt %p for closing\n", xprt);
+
+		/* a thread will dequeue and close it soon */
+		svc_xprt_enqueue(xprt);
+	}
+	spin_unlock_bh(&serv->sv_lock);
+
+	mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ);
+}
+
+static void call_xpt_users(struct svc_xprt *xprt)
+{
+	struct svc_xpt_user *u;
+
+	spin_lock(&xprt->xpt_lock);
+	while (!list_empty(&xprt->xpt_users)) {
+		u = list_first_entry(&xprt->xpt_users, struct svc_xpt_user, list);
+		list_del(&u->list);
+		u->callback(u);
+	}
+	spin_unlock(&xprt->xpt_lock);
+}
+
+/*
+ * Remove a dead transport
+ */
+static void svc_delete_xprt(struct svc_xprt *xprt)
+{
+	struct svc_serv	*serv = xprt->xpt_server;
+	struct svc_deferred_req *dr;
+
+	/* Only do this once */
+	if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
+		BUG();
+
+	dprintk("svc: svc_delete_xprt(%p)\n", xprt);
+	xprt->xpt_ops->xpo_detach(xprt);
+
+	spin_lock_bh(&serv->sv_lock);
+	list_del_init(&xprt->xpt_list);
+	WARN_ON_ONCE(!list_empty(&xprt->xpt_ready));
+	if (test_bit(XPT_TEMP, &xprt->xpt_flags))
+		serv->sv_tmpcnt--;
+	spin_unlock_bh(&serv->sv_lock);
+
+	while ((dr = svc_deferred_dequeue(xprt)) != NULL)
+		kfree(dr);
+
+	call_xpt_users(xprt);
+	svc_xprt_put(xprt);
+}
+
+void svc_close_xprt(struct svc_xprt *xprt)
+{
+	set_bit(XPT_CLOSE, &xprt->xpt_flags);
+	if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags))
+		/* someone else will have to effect the close */
+		return;
+	/*
+	 * We expect svc_close_xprt() to work even when no threads are
+	 * running (e.g., while configuring the server before starting
+	 * any threads), so if the transport isn't busy, we delete
+	 * it ourself:
+	 */
+	svc_delete_xprt(xprt);
+}
+EXPORT_SYMBOL_GPL(svc_close_xprt);
+
+static int svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)
+{
+	struct svc_xprt *xprt;
+	int ret = 0;
+
+	spin_lock(&serv->sv_lock);
+	list_for_each_entry(xprt, xprt_list, xpt_list) {
+		if (xprt->xpt_net != net)
+			continue;
+		ret++;
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		svc_xprt_enqueue(xprt);
+	}
+	spin_unlock(&serv->sv_lock);
+	return ret;
+}
+
+static struct svc_xprt *svc_dequeue_net(struct svc_serv *serv, struct net *net)
+{
+	struct svc_pool *pool;
+	struct svc_xprt *xprt;
+	struct svc_xprt *tmp;
+	int i;
+
+	for (i = 0; i < serv->sv_nrpools; i++) {
+		pool = &serv->sv_pools[i];
+
+		spin_lock_bh(&pool->sp_lock);
+		list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) {
+			if (xprt->xpt_net != net)
+				continue;
+			list_del_init(&xprt->xpt_ready);
+			spin_unlock_bh(&pool->sp_lock);
+			return xprt;
+		}
+		spin_unlock_bh(&pool->sp_lock);
+	}
+	return NULL;
+}
+
+static void svc_clean_up_xprts(struct svc_serv *serv, struct net *net)
+{
+	struct svc_xprt *xprt;
+
+	while ((xprt = svc_dequeue_net(serv, net))) {
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		svc_delete_xprt(xprt);
+	}
+}
+
+/*
+ * Server threads may still be running (especially in the case where the
+ * service is still running in other network namespaces).
+ *
+ * So we shut down sockets the same way we would on a running server, by
+ * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do
+ * the close.  In the case there are no such other threads,
+ * threads running, svc_clean_up_xprts() does a simple version of a
+ * server's main event loop, and in the case where there are other
+ * threads, we may need to wait a little while and then check again to
+ * see if they're done.
+ */
+void svc_close_net(struct svc_serv *serv, struct net *net)
+{
+	int delay = 0;
+
+	while (svc_close_list(serv, &serv->sv_permsocks, net) +
+	       svc_close_list(serv, &serv->sv_tempsocks, net)) {
+
+		svc_clean_up_xprts(serv, net);
+		msleep(delay++);
+	}
+}
+
+/*
+ * Handle defer and revisit of requests
+ */
+
+static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
+{
+	struct svc_deferred_req *dr =
+		container_of(dreq, struct svc_deferred_req, handle);
+	struct svc_xprt *xprt = dr->xprt;
+
+	spin_lock(&xprt->xpt_lock);
+	set_bit(XPT_DEFERRED, &xprt->xpt_flags);
+	if (too_many || test_bit(XPT_DEAD, &xprt->xpt_flags)) {
+		spin_unlock(&xprt->xpt_lock);
+		dprintk("revisit canceled\n");
+		svc_xprt_put(xprt);
+		kfree(dr);
+		return;
+	}
+	dprintk("revisit queued\n");
+	dr->xprt = NULL;
+	list_add(&dr->handle.recent, &xprt->xpt_deferred);
+	spin_unlock(&xprt->xpt_lock);
+	svc_xprt_enqueue(xprt);
+	svc_xprt_put(xprt);
+}
+
+/*
+ * Save the request off for later processing. The request buffer looks
+ * like this:
+ *
+ * <xprt-header><rpc-header><rpc-pagelist><rpc-tail>
+ *
+ * This code can only handle requests that consist of an xprt-header
+ * and rpc-header.
+ */
+static struct cache_deferred_req *svc_defer(struct cache_req *req)
+{
+	struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle);
+	struct svc_deferred_req *dr;
+
+	if (rqstp->rq_arg.page_len || !test_bit(RQ_USEDEFERRAL, &rqstp->rq_flags))
+		return NULL; /* if more than a page, give up FIXME */
+	if (rqstp->rq_deferred) {
+		dr = rqstp->rq_deferred;
+		rqstp->rq_deferred = NULL;
+	} else {
+		size_t skip;
+		size_t size;
+		/* FIXME maybe discard if size too large */
+		size = sizeof(struct svc_deferred_req) + rqstp->rq_arg.len;
+		dr = kmalloc(size, GFP_KERNEL);
+		if (dr == NULL)
+			return NULL;
+
+		dr->handle.owner = rqstp->rq_server;
+		dr->prot = rqstp->rq_prot;
+		memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen);
+		dr->addrlen = rqstp->rq_addrlen;
+		dr->daddr = rqstp->rq_daddr;
+		dr->argslen = rqstp->rq_arg.len >> 2;
+		dr->xprt_hlen = rqstp->rq_xprt_hlen;
+
+		/* back up head to the start of the buffer and copy */
+		skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
+		memcpy(dr->args, rqstp->rq_arg.head[0].iov_base - skip,
+		       dr->argslen << 2);
+	}
+	svc_xprt_get(rqstp->rq_xprt);
+	dr->xprt = rqstp->rq_xprt;
+	set_bit(RQ_DROPME, &rqstp->rq_flags);
+
+	dr->handle.revisit = svc_revisit;
+	return &dr->handle;
+}
+
+/*
+ * recv data from a deferred request into an active one
+ */
+static int svc_deferred_recv(struct svc_rqst *rqstp)
+{
+	struct svc_deferred_req *dr = rqstp->rq_deferred;
+
+	/* setup iov_base past transport header */
+	rqstp->rq_arg.head[0].iov_base = dr->args + (dr->xprt_hlen>>2);
+	/* The iov_len does not include the transport header bytes */
+	rqstp->rq_arg.head[0].iov_len = (dr->argslen<<2) - dr->xprt_hlen;
+	rqstp->rq_arg.page_len = 0;
+	/* The rq_arg.len includes the transport header bytes */
+	rqstp->rq_arg.len     = dr->argslen<<2;
+	rqstp->rq_prot        = dr->prot;
+	memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen);
+	rqstp->rq_addrlen     = dr->addrlen;
+	/* Save off transport header len in case we get deferred again */
+	rqstp->rq_xprt_hlen   = dr->xprt_hlen;
+	rqstp->rq_daddr       = dr->daddr;
+	rqstp->rq_respages    = rqstp->rq_pages;
+	return (dr->argslen<<2) - dr->xprt_hlen;
+}
+
+
+static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
+{
+	struct svc_deferred_req *dr = NULL;
+
+	if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags))
+		return NULL;
+	spin_lock(&xprt->xpt_lock);
+	if (!list_empty(&xprt->xpt_deferred)) {
+		dr = list_entry(xprt->xpt_deferred.next,
+				struct svc_deferred_req,
+				handle.recent);
+		list_del_init(&dr->handle.recent);
+	} else
+		clear_bit(XPT_DEFERRED, &xprt->xpt_flags);
+	spin_unlock(&xprt->xpt_lock);
+	return dr;
+}
+
+/**
+ * svc_find_xprt - find an RPC transport instance
+ * @serv: pointer to svc_serv to search
+ * @xcl_name: C string containing transport's class name
+ * @net: owner net pointer
+ * @af: Address family of transport's local address
+ * @port: transport's IP port number
+ *
+ * Return the transport instance pointer for the endpoint accepting
+ * connections/peer traffic from the specified transport class,
+ * address family and port.
+ *
+ * Specifying 0 for the address family or port is effectively a
+ * wild-card, and will result in matching the first transport in the
+ * service's list that has a matching class name.
+ */
+struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
+			       struct net *net, const sa_family_t af,
+			       const unsigned short port)
+{
+	struct svc_xprt *xprt;
+	struct svc_xprt *found = NULL;
+
+	/* Sanity check the args */
+	if (serv == NULL || xcl_name == NULL)
+		return found;
+
+	spin_lock_bh(&serv->sv_lock);
+	list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
+		if (xprt->xpt_net != net)
+			continue;
+		if (strcmp(xprt->xpt_class->xcl_name, xcl_name))
+			continue;
+		if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family)
+			continue;
+		if (port != 0 && port != svc_xprt_local_port(xprt))
+			continue;
+		found = xprt;
+		svc_xprt_get(xprt);
+		break;
+	}
+	spin_unlock_bh(&serv->sv_lock);
+	return found;
+}
+EXPORT_SYMBOL_GPL(svc_find_xprt);
+
+static int svc_one_xprt_name(const struct svc_xprt *xprt,
+			     char *pos, int remaining)
+{
+	int len;
+
+	len = snprintf(pos, remaining, "%s %u\n",
+			xprt->xpt_class->xcl_name,
+			svc_xprt_local_port(xprt));
+	if (len >= remaining)
+		return -ENAMETOOLONG;
+	return len;
+}
+
+/**
+ * svc_xprt_names - format a buffer with a list of transport names
+ * @serv: pointer to an RPC service
+ * @buf: pointer to a buffer to be filled in
+ * @buflen: length of buffer to be filled in
+ *
+ * Fills in @buf with a string containing a list of transport names,
+ * each name terminated with '\n'.
+ *
+ * Returns positive length of the filled-in string on success; otherwise
+ * a negative errno value is returned if an error occurs.
+ */
+int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen)
+{
+	struct svc_xprt *xprt;
+	int len, totlen;
+	char *pos;
+
+	/* Sanity check args */
+	if (!serv)
+		return 0;
+
+	spin_lock_bh(&serv->sv_lock);
+
+	pos = buf;
+	totlen = 0;
+	list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
+		len = svc_one_xprt_name(xprt, pos, buflen - totlen);
+		if (len < 0) {
+			*buf = '\0';
+			totlen = len;
+		}
+		if (len <= 0)
+			break;
+
+		pos += len;
+		totlen += len;
+	}
+
+	spin_unlock_bh(&serv->sv_lock);
+	return totlen;
+}
+EXPORT_SYMBOL_GPL(svc_xprt_names);
+
+
+/*----------------------------------------------------------------------------*/
+
+static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos)
+{
+	unsigned int pidx = (unsigned int)*pos;
+	struct svc_serv *serv = m->private;
+
+	dprintk("svc_pool_stats_start, *pidx=%u\n", pidx);
+
+	if (!pidx)
+		return SEQ_START_TOKEN;
+	return (pidx > serv->sv_nrpools ? NULL : &serv->sv_pools[pidx-1]);
+}
+
+static void *svc_pool_stats_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	struct svc_pool *pool = p;
+	struct svc_serv *serv = m->private;
+
+	dprintk("svc_pool_stats_next, *pos=%llu\n", *pos);
+
+	if (p == SEQ_START_TOKEN) {
+		pool = &serv->sv_pools[0];
+	} else {
+		unsigned int pidx = (pool - &serv->sv_pools[0]);
+		if (pidx < serv->sv_nrpools-1)
+			pool = &serv->sv_pools[pidx+1];
+		else
+			pool = NULL;
+	}
+	++*pos;
+	return pool;
+}
+
+static void svc_pool_stats_stop(struct seq_file *m, void *p)
+{
+}
+
+static int svc_pool_stats_show(struct seq_file *m, void *p)
+{
+	struct svc_pool *pool = p;
+
+	if (p == SEQ_START_TOKEN) {
+		seq_puts(m, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n");
+		return 0;
+	}
+
+	seq_printf(m, "%u %lu %lu %lu %lu\n",
+		pool->sp_id,
+		(unsigned long)atomic_long_read(&pool->sp_stats.packets),
+		pool->sp_stats.sockets_queued,
+		(unsigned long)atomic_long_read(&pool->sp_stats.threads_woken),
+		(unsigned long)atomic_long_read(&pool->sp_stats.threads_timedout));
+
+	return 0;
+}
+
+static const struct seq_operations svc_pool_stats_seq_ops = {
+	.start	= svc_pool_stats_start,
+	.next	= svc_pool_stats_next,
+	.stop	= svc_pool_stats_stop,
+	.show	= svc_pool_stats_show,
+};
+
+int svc_pool_stats_open(struct svc_serv *serv, struct file *file)
+{
+	int err;
+
+	err = seq_open(file, &svc_pool_stats_seq_ops);
+	if (!err)
+		((struct seq_file *) file->private_data)->private = serv;
+	return err;
+}
+EXPORT_SYMBOL(svc_pool_stats_open);
+
+/*----------------------------------------------------------------------------*/
diff --git a/kernel/net/sunrpc/svcauth.c b/kernel/net/sunrpc/svcauth.c
new file mode 100644
index 000000000..79c0f3459
--- /dev/null
+++ b/kernel/net/sunrpc/svcauth.c
@@ -0,0 +1,166 @@
+/*
+ * linux/net/sunrpc/svcauth.c
+ *
+ * The generic interface for RPC authentication on the server side.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ *
+ * CHANGES
+ * 19-Apr-2000 Chris Evans      - Security fix
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/err.h>
+#include <linux/hash.h>
+
+#define RPCDBG_FACILITY	RPCDBG_AUTH
+
+
+/*
+ * Table of authenticators
+ */
+extern struct auth_ops svcauth_null;
+extern struct auth_ops svcauth_unix;
+
+static DEFINE_SPINLOCK(authtab_lock);
+static struct auth_ops	*authtab[RPC_AUTH_MAXFLAVOR] = {
+	[0] = &svcauth_null,
+	[1] = &svcauth_unix,
+};
+
+int
+svc_authenticate(struct svc_rqst *rqstp, __be32 *authp)
+{
+	rpc_authflavor_t	flavor;
+	struct auth_ops		*aops;
+
+	*authp = rpc_auth_ok;
+
+	flavor = svc_getnl(&rqstp->rq_arg.head[0]);
+
+	dprintk("svc: svc_authenticate (%d)\n", flavor);
+
+	spin_lock(&authtab_lock);
+	if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor]) ||
+	    !try_module_get(aops->owner)) {
+		spin_unlock(&authtab_lock);
+		*authp = rpc_autherr_badcred;
+		return SVC_DENIED;
+	}
+	spin_unlock(&authtab_lock);
+
+	rqstp->rq_auth_slack = 0;
+
+	rqstp->rq_authop = aops;
+	return aops->accept(rqstp, authp);
+}
+EXPORT_SYMBOL_GPL(svc_authenticate);
+
+int svc_set_client(struct svc_rqst *rqstp)
+{
+	return rqstp->rq_authop->set_client(rqstp);
+}
+EXPORT_SYMBOL_GPL(svc_set_client);
+
+/* A request, which was authenticated, has now executed.
+ * Time to finalise the credentials and verifier
+ * and release and resources
+ */
+int svc_authorise(struct svc_rqst *rqstp)
+{
+	struct auth_ops *aops = rqstp->rq_authop;
+	int rv = 0;
+
+	rqstp->rq_authop = NULL;
+
+	if (aops) {
+		rv = aops->release(rqstp);
+		module_put(aops->owner);
+	}
+	return rv;
+}
+
+int
+svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
+{
+	int rv = -EINVAL;
+	spin_lock(&authtab_lock);
+	if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
+		authtab[flavor] = aops;
+		rv = 0;
+	}
+	spin_unlock(&authtab_lock);
+	return rv;
+}
+EXPORT_SYMBOL_GPL(svc_auth_register);
+
+void
+svc_auth_unregister(rpc_authflavor_t flavor)
+{
+	spin_lock(&authtab_lock);
+	if (flavor < RPC_AUTH_MAXFLAVOR)
+		authtab[flavor] = NULL;
+	spin_unlock(&authtab_lock);
+}
+EXPORT_SYMBOL_GPL(svc_auth_unregister);
+
+/**************************************************
+ * 'auth_domains' are stored in a hash table indexed by name.
+ * When the last reference to an 'auth_domain' is dropped,
+ * the object is unhashed and freed.
+ * If auth_domain_lookup fails to find an entry, it will return
+ * it's second argument 'new'.  If this is non-null, it will
+ * have been atomically linked into the table.
+ */
+
+#define	DN_HASHBITS	6
+#define	DN_HASHMAX	(1<<DN_HASHBITS)
+
+static struct hlist_head	auth_domain_table[DN_HASHMAX];
+static spinlock_t	auth_domain_lock =
+	__SPIN_LOCK_UNLOCKED(auth_domain_lock);
+
+void auth_domain_put(struct auth_domain *dom)
+{
+	if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {
+		hlist_del(&dom->hash);
+		dom->flavour->domain_release(dom);
+		spin_unlock(&auth_domain_lock);
+	}
+}
+EXPORT_SYMBOL_GPL(auth_domain_put);
+
+struct auth_domain *
+auth_domain_lookup(char *name, struct auth_domain *new)
+{
+	struct auth_domain *hp;
+	struct hlist_head *head;
+
+	head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
+
+	spin_lock(&auth_domain_lock);
+
+	hlist_for_each_entry(hp, head, hash) {
+		if (strcmp(hp->name, name)==0) {
+			kref_get(&hp->ref);
+			spin_unlock(&auth_domain_lock);
+			return hp;
+		}
+	}
+	if (new)
+		hlist_add_head(&new->hash, head);
+	spin_unlock(&auth_domain_lock);
+	return new;
+}
+EXPORT_SYMBOL_GPL(auth_domain_lookup);
+
+struct auth_domain *auth_domain_find(char *name)
+{
+	return auth_domain_lookup(name, NULL);
+}
+EXPORT_SYMBOL_GPL(auth_domain_find);
diff --git a/kernel/net/sunrpc/svcauth_unix.c b/kernel/net/sunrpc/svcauth_unix.c
new file mode 100644
index 000000000..621ca7b4a
--- /dev/null
+++ b/kernel/net/sunrpc/svcauth_unix.c
@@ -0,0 +1,914 @@
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/err.h>
+#include <linux/seq_file.h>
+#include <linux/hash.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <linux/kernel.h>
+#include <linux/user_namespace.h>
+#define RPCDBG_FACILITY	RPCDBG_AUTH
+
+
+#include "netns.h"
+
+/*
+ * AUTHUNIX and AUTHNULL credentials are both handled here.
+ * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
+ * are always nobody (-2).  i.e. we do the same IP address checks for
+ * AUTHNULL as for AUTHUNIX, and that is done here.
+ */
+
+
+struct unix_domain {
+	struct auth_domain	h;
+	/* other stuff later */
+};
+
+extern struct auth_ops svcauth_null;
+extern struct auth_ops svcauth_unix;
+
+static void svcauth_unix_domain_release(struct auth_domain *dom)
+{
+	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
+
+	kfree(dom->name);
+	kfree(ud);
+}
+
+struct auth_domain *unix_domain_find(char *name)
+{
+	struct auth_domain *rv;
+	struct unix_domain *new = NULL;
+
+	rv = auth_domain_lookup(name, NULL);
+	while(1) {
+		if (rv) {
+			if (new && rv != &new->h)
+				svcauth_unix_domain_release(&new->h);
+
+			if (rv->flavour != &svcauth_unix) {
+				auth_domain_put(rv);
+				return NULL;
+			}
+			return rv;
+		}
+
+		new = kmalloc(sizeof(*new), GFP_KERNEL);
+		if (new == NULL)
+			return NULL;
+		kref_init(&new->h.ref);
+		new->h.name = kstrdup(name, GFP_KERNEL);
+		if (new->h.name == NULL) {
+			kfree(new);
+			return NULL;
+		}
+		new->h.flavour = &svcauth_unix;
+		rv = auth_domain_lookup(name, &new->h);
+	}
+}
+EXPORT_SYMBOL_GPL(unix_domain_find);
+
+
+/**************************************************
+ * cache for IP address to unix_domain
+ * as needed by AUTH_UNIX
+ */
+#define	IP_HASHBITS	8
+#define	IP_HASHMAX	(1<<IP_HASHBITS)
+
+struct ip_map {
+	struct cache_head	h;
+	char			m_class[8]; /* e.g. "nfsd" */
+	struct in6_addr		m_addr;
+	struct unix_domain	*m_client;
+};
+
+static void ip_map_put(struct kref *kref)
+{
+	struct cache_head *item = container_of(kref, struct cache_head, ref);
+	struct ip_map *im = container_of(item, struct ip_map,h);
+
+	if (test_bit(CACHE_VALID, &item->flags) &&
+	    !test_bit(CACHE_NEGATIVE, &item->flags))
+		auth_domain_put(&im->m_client->h);
+	kfree(im);
+}
+
+static inline int hash_ip6(const struct in6_addr *ip)
+{
+	return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
+}
+static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
+{
+	struct ip_map *orig = container_of(corig, struct ip_map, h);
+	struct ip_map *new = container_of(cnew, struct ip_map, h);
+	return strcmp(orig->m_class, new->m_class) == 0 &&
+	       ipv6_addr_equal(&orig->m_addr, &new->m_addr);
+}
+static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct ip_map *new = container_of(cnew, struct ip_map, h);
+	struct ip_map *item = container_of(citem, struct ip_map, h);
+
+	strcpy(new->m_class, item->m_class);
+	new->m_addr = item->m_addr;
+}
+static void update(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct ip_map *new = container_of(cnew, struct ip_map, h);
+	struct ip_map *item = container_of(citem, struct ip_map, h);
+
+	kref_get(&item->m_client->h.ref);
+	new->m_client = item->m_client;
+}
+static struct cache_head *ip_map_alloc(void)
+{
+	struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
+	if (i)
+		return &i->h;
+	else
+		return NULL;
+}
+
+static void ip_map_request(struct cache_detail *cd,
+				  struct cache_head *h,
+				  char **bpp, int *blen)
+{
+	char text_addr[40];
+	struct ip_map *im = container_of(h, struct ip_map, h);
+
+	if (ipv6_addr_v4mapped(&(im->m_addr))) {
+		snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
+	} else {
+		snprintf(text_addr, 40, "%pI6", &im->m_addr);
+	}
+	qword_add(bpp, blen, im->m_class);
+	qword_add(bpp, blen, text_addr);
+	(*bpp)[-1] = '\n';
+}
+
+static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
+static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
+
+static int ip_map_parse(struct cache_detail *cd,
+			  char *mesg, int mlen)
+{
+	/* class ipaddress [domainname] */
+	/* should be safe just to use the start of the input buffer
+	 * for scratch: */
+	char *buf = mesg;
+	int len;
+	char class[8];
+	union {
+		struct sockaddr		sa;
+		struct sockaddr_in	s4;
+		struct sockaddr_in6	s6;
+	} address;
+	struct sockaddr_in6 sin6;
+	int err;
+
+	struct ip_map *ipmp;
+	struct auth_domain *dom;
+	time_t expiry;
+
+	if (mesg[mlen-1] != '\n')
+		return -EINVAL;
+	mesg[mlen-1] = 0;
+
+	/* class */
+	len = qword_get(&mesg, class, sizeof(class));
+	if (len <= 0) return -EINVAL;
+
+	/* ip address */
+	len = qword_get(&mesg, buf, mlen);
+	if (len <= 0) return -EINVAL;
+
+	if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
+		return -EINVAL;
+	switch (address.sa.sa_family) {
+	case AF_INET:
+		/* Form a mapped IPv4 address in sin6 */
+		sin6.sin6_family = AF_INET6;
+		ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
+				&sin6.sin6_addr);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		memcpy(&sin6, &address.s6, sizeof(sin6));
+		break;
+#endif
+	default:
+		return -EINVAL;
+	}
+
+	expiry = get_expiry(&mesg);
+	if (expiry ==0)
+		return -EINVAL;
+
+	/* domainname, or empty for NEGATIVE */
+	len = qword_get(&mesg, buf, mlen);
+	if (len < 0) return -EINVAL;
+
+	if (len) {
+		dom = unix_domain_find(buf);
+		if (dom == NULL)
+			return -ENOENT;
+	} else
+		dom = NULL;
+
+	/* IPv6 scope IDs are ignored for now */
+	ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
+	if (ipmp) {
+		err = __ip_map_update(cd, ipmp,
+			     container_of(dom, struct unix_domain, h),
+			     expiry);
+	} else
+		err = -ENOMEM;
+
+	if (dom)
+		auth_domain_put(dom);
+
+	cache_flush();
+	return err;
+}
+
+static int ip_map_show(struct seq_file *m,
+		       struct cache_detail *cd,
+		       struct cache_head *h)
+{
+	struct ip_map *im;
+	struct in6_addr addr;
+	char *dom = "-no-domain-";
+
+	if (h == NULL) {
+		seq_puts(m, "#class IP domain\n");
+		return 0;
+	}
+	im = container_of(h, struct ip_map, h);
+	/* class addr domain */
+	addr = im->m_addr;
+
+	if (test_bit(CACHE_VALID, &h->flags) &&
+	    !test_bit(CACHE_NEGATIVE, &h->flags))
+		dom = im->m_client->h.name;
+
+	if (ipv6_addr_v4mapped(&addr)) {
+		seq_printf(m, "%s %pI4 %s\n",
+			im->m_class, &addr.s6_addr32[3], dom);
+	} else {
+		seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
+	}
+	return 0;
+}
+
+
+static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
+		struct in6_addr *addr)
+{
+	struct ip_map ip;
+	struct cache_head *ch;
+
+	strcpy(ip.m_class, class);
+	ip.m_addr = *addr;
+	ch = sunrpc_cache_lookup(cd, &ip.h,
+				 hash_str(class, IP_HASHBITS) ^
+				 hash_ip6(addr));
+
+	if (ch)
+		return container_of(ch, struct ip_map, h);
+	else
+		return NULL;
+}
+
+static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
+		struct in6_addr *addr)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	return __ip_map_lookup(sn->ip_map_cache, class, addr);
+}
+
+static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
+		struct unix_domain *udom, time_t expiry)
+{
+	struct ip_map ip;
+	struct cache_head *ch;
+
+	ip.m_client = udom;
+	ip.h.flags = 0;
+	if (!udom)
+		set_bit(CACHE_NEGATIVE, &ip.h.flags);
+	ip.h.expiry_time = expiry;
+	ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
+				 hash_str(ipm->m_class, IP_HASHBITS) ^
+				 hash_ip6(&ipm->m_addr));
+	if (!ch)
+		return -ENOMEM;
+	cache_put(ch, cd);
+	return 0;
+}
+
+static inline int ip_map_update(struct net *net, struct ip_map *ipm,
+		struct unix_domain *udom, time_t expiry)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
+}
+
+void svcauth_unix_purge(struct net *net)
+{
+	struct sunrpc_net *sn;
+
+	sn = net_generic(net, sunrpc_net_id);
+	cache_purge(sn->ip_map_cache);
+}
+EXPORT_SYMBOL_GPL(svcauth_unix_purge);
+
+static inline struct ip_map *
+ip_map_cached_get(struct svc_xprt *xprt)
+{
+	struct ip_map *ipm = NULL;
+	struct sunrpc_net *sn;
+
+	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+		spin_lock(&xprt->xpt_lock);
+		ipm = xprt->xpt_auth_cache;
+		if (ipm != NULL) {
+			sn = net_generic(xprt->xpt_net, sunrpc_net_id);
+			if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
+				/*
+				 * The entry has been invalidated since it was
+				 * remembered, e.g. by a second mount from the
+				 * same IP address.
+				 */
+				xprt->xpt_auth_cache = NULL;
+				spin_unlock(&xprt->xpt_lock);
+				cache_put(&ipm->h, sn->ip_map_cache);
+				return NULL;
+			}
+			cache_get(&ipm->h);
+		}
+		spin_unlock(&xprt->xpt_lock);
+	}
+	return ipm;
+}
+
+static inline void
+ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
+{
+	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+		spin_lock(&xprt->xpt_lock);
+		if (xprt->xpt_auth_cache == NULL) {
+			/* newly cached, keep the reference */
+			xprt->xpt_auth_cache = ipm;
+			ipm = NULL;
+		}
+		spin_unlock(&xprt->xpt_lock);
+	}
+	if (ipm) {
+		struct sunrpc_net *sn;
+
+		sn = net_generic(xprt->xpt_net, sunrpc_net_id);
+		cache_put(&ipm->h, sn->ip_map_cache);
+	}
+}
+
+void
+svcauth_unix_info_release(struct svc_xprt *xpt)
+{
+	struct ip_map *ipm;
+
+	ipm = xpt->xpt_auth_cache;
+	if (ipm != NULL) {
+		struct sunrpc_net *sn;
+
+		sn = net_generic(xpt->xpt_net, sunrpc_net_id);
+		cache_put(&ipm->h, sn->ip_map_cache);
+	}
+}
+
+/****************************************************************************
+ * auth.unix.gid cache
+ * simple cache to map a UID to a list of GIDs
+ * because AUTH_UNIX aka AUTH_SYS has a max of 16
+ */
+#define	GID_HASHBITS	8
+#define	GID_HASHMAX	(1<<GID_HASHBITS)
+
+struct unix_gid {
+	struct cache_head	h;
+	kuid_t			uid;
+	struct group_info	*gi;
+};
+
+static int unix_gid_hash(kuid_t uid)
+{
+	return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
+}
+
+static void unix_gid_put(struct kref *kref)
+{
+	struct cache_head *item = container_of(kref, struct cache_head, ref);
+	struct unix_gid *ug = container_of(item, struct unix_gid, h);
+	if (test_bit(CACHE_VALID, &item->flags) &&
+	    !test_bit(CACHE_NEGATIVE, &item->flags))
+		put_group_info(ug->gi);
+	kfree(ug);
+}
+
+static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
+{
+	struct unix_gid *orig = container_of(corig, struct unix_gid, h);
+	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+	return uid_eq(orig->uid, new->uid);
+}
+static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+	struct unix_gid *item = container_of(citem, struct unix_gid, h);
+	new->uid = item->uid;
+}
+static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
+{
+	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+	struct unix_gid *item = container_of(citem, struct unix_gid, h);
+
+	get_group_info(item->gi);
+	new->gi = item->gi;
+}
+static struct cache_head *unix_gid_alloc(void)
+{
+	struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
+	if (g)
+		return &g->h;
+	else
+		return NULL;
+}
+
+static void unix_gid_request(struct cache_detail *cd,
+			     struct cache_head *h,
+			     char **bpp, int *blen)
+{
+	char tuid[20];
+	struct unix_gid *ug = container_of(h, struct unix_gid, h);
+
+	snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
+	qword_add(bpp, blen, tuid);
+	(*bpp)[-1] = '\n';
+}
+
+static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
+
+static int unix_gid_parse(struct cache_detail *cd,
+			char *mesg, int mlen)
+{
+	/* uid expiry Ngid gid0 gid1 ... gidN-1 */
+	int id;
+	kuid_t uid;
+	int gids;
+	int rv;
+	int i;
+	int err;
+	time_t expiry;
+	struct unix_gid ug, *ugp;
+
+	if (mesg[mlen - 1] != '\n')
+		return -EINVAL;
+	mesg[mlen-1] = 0;
+
+	rv = get_int(&mesg, &id);
+	if (rv)
+		return -EINVAL;
+	uid = make_kuid(&init_user_ns, id);
+	ug.uid = uid;
+
+	expiry = get_expiry(&mesg);
+	if (expiry == 0)
+		return -EINVAL;
+
+	rv = get_int(&mesg, &gids);
+	if (rv || gids < 0 || gids > 8192)
+		return -EINVAL;
+
+	ug.gi = groups_alloc(gids);
+	if (!ug.gi)
+		return -ENOMEM;
+
+	for (i = 0 ; i < gids ; i++) {
+		int gid;
+		kgid_t kgid;
+		rv = get_int(&mesg, &gid);
+		err = -EINVAL;
+		if (rv)
+			goto out;
+		kgid = make_kgid(&init_user_ns, gid);
+		if (!gid_valid(kgid))
+			goto out;
+		GROUP_AT(ug.gi, i) = kgid;
+	}
+
+	ugp = unix_gid_lookup(cd, uid);
+	if (ugp) {
+		struct cache_head *ch;
+		ug.h.flags = 0;
+		ug.h.expiry_time = expiry;
+		ch = sunrpc_cache_update(cd,
+					 &ug.h, &ugp->h,
+					 unix_gid_hash(uid));
+		if (!ch)
+			err = -ENOMEM;
+		else {
+			err = 0;
+			cache_put(ch, cd);
+		}
+	} else
+		err = -ENOMEM;
+ out:
+	if (ug.gi)
+		put_group_info(ug.gi);
+	return err;
+}
+
+static int unix_gid_show(struct seq_file *m,
+			 struct cache_detail *cd,
+			 struct cache_head *h)
+{
+	struct user_namespace *user_ns = &init_user_ns;
+	struct unix_gid *ug;
+	int i;
+	int glen;
+
+	if (h == NULL) {
+		seq_puts(m, "#uid cnt: gids...\n");
+		return 0;
+	}
+	ug = container_of(h, struct unix_gid, h);
+	if (test_bit(CACHE_VALID, &h->flags) &&
+	    !test_bit(CACHE_NEGATIVE, &h->flags))
+		glen = ug->gi->ngroups;
+	else
+		glen = 0;
+
+	seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
+	for (i = 0; i < glen; i++)
+		seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
+	seq_printf(m, "\n");
+	return 0;
+}
+
+static struct cache_detail unix_gid_cache_template = {
+	.owner		= THIS_MODULE,
+	.hash_size	= GID_HASHMAX,
+	.name		= "auth.unix.gid",
+	.cache_put	= unix_gid_put,
+	.cache_request	= unix_gid_request,
+	.cache_parse	= unix_gid_parse,
+	.cache_show	= unix_gid_show,
+	.match		= unix_gid_match,
+	.init		= unix_gid_init,
+	.update		= unix_gid_update,
+	.alloc		= unix_gid_alloc,
+};
+
+int unix_gid_cache_create(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd;
+	int err;
+
+	cd = cache_create_net(&unix_gid_cache_template, net);
+	if (IS_ERR(cd))
+		return PTR_ERR(cd);
+	err = cache_register_net(cd, net);
+	if (err) {
+		cache_destroy_net(cd, net);
+		return err;
+	}
+	sn->unix_gid_cache = cd;
+	return 0;
+}
+
+void unix_gid_cache_destroy(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd = sn->unix_gid_cache;
+
+	sn->unix_gid_cache = NULL;
+	cache_purge(cd);
+	cache_unregister_net(cd, net);
+	cache_destroy_net(cd, net);
+}
+
+static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
+{
+	struct unix_gid ug;
+	struct cache_head *ch;
+
+	ug.uid = uid;
+	ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
+	if (ch)
+		return container_of(ch, struct unix_gid, h);
+	else
+		return NULL;
+}
+
+static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
+{
+	struct unix_gid *ug;
+	struct group_info *gi;
+	int ret;
+	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
+					    sunrpc_net_id);
+
+	ug = unix_gid_lookup(sn->unix_gid_cache, uid);
+	if (!ug)
+		return ERR_PTR(-EAGAIN);
+	ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
+	switch (ret) {
+	case -ENOENT:
+		return ERR_PTR(-ENOENT);
+	case -ETIMEDOUT:
+		return ERR_PTR(-ESHUTDOWN);
+	case 0:
+		gi = get_group_info(ug->gi);
+		cache_put(&ug->h, sn->unix_gid_cache);
+		return gi;
+	default:
+		return ERR_PTR(-EAGAIN);
+	}
+}
+
+int
+svcauth_unix_set_client(struct svc_rqst *rqstp)
+{
+	struct sockaddr_in *sin;
+	struct sockaddr_in6 *sin6, sin6_storage;
+	struct ip_map *ipm;
+	struct group_info *gi;
+	struct svc_cred *cred = &rqstp->rq_cred;
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct net *net = xprt->xpt_net;
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	switch (rqstp->rq_addr.ss_family) {
+	case AF_INET:
+		sin = svc_addr_in(rqstp);
+		sin6 = &sin6_storage;
+		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
+		break;
+	case AF_INET6:
+		sin6 = svc_addr_in6(rqstp);
+		break;
+	default:
+		BUG();
+	}
+
+	rqstp->rq_client = NULL;
+	if (rqstp->rq_proc == 0)
+		return SVC_OK;
+
+	ipm = ip_map_cached_get(xprt);
+	if (ipm == NULL)
+		ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
+				    &sin6->sin6_addr);
+
+	if (ipm == NULL)
+		return SVC_DENIED;
+
+	switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
+		default:
+			BUG();
+		case -ETIMEDOUT:
+			return SVC_CLOSE;
+		case -EAGAIN:
+			return SVC_DROP;
+		case -ENOENT:
+			return SVC_DENIED;
+		case 0:
+			rqstp->rq_client = &ipm->m_client->h;
+			kref_get(&rqstp->rq_client->ref);
+			ip_map_cached_put(xprt, ipm);
+			break;
+	}
+
+	gi = unix_gid_find(cred->cr_uid, rqstp);
+	switch (PTR_ERR(gi)) {
+	case -EAGAIN:
+		return SVC_DROP;
+	case -ESHUTDOWN:
+		return SVC_CLOSE;
+	case -ENOENT:
+		break;
+	default:
+		put_group_info(cred->cr_group_info);
+		cred->cr_group_info = gi;
+	}
+	return SVC_OK;
+}
+
+EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
+
+static int
+svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
+{
+	struct kvec	*argv = &rqstp->rq_arg.head[0];
+	struct kvec	*resv = &rqstp->rq_res.head[0];
+	struct svc_cred	*cred = &rqstp->rq_cred;
+
+	cred->cr_group_info = NULL;
+	cred->cr_principal = NULL;
+	rqstp->rq_client = NULL;
+
+	if (argv->iov_len < 3*4)
+		return SVC_GARBAGE;
+
+	if (svc_getu32(argv) != 0) {
+		dprintk("svc: bad null cred\n");
+		*authp = rpc_autherr_badcred;
+		return SVC_DENIED;
+	}
+	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
+		dprintk("svc: bad null verf\n");
+		*authp = rpc_autherr_badverf;
+		return SVC_DENIED;
+	}
+
+	/* Signal that mapping to nobody uid/gid is required */
+	cred->cr_uid = INVALID_UID;
+	cred->cr_gid = INVALID_GID;
+	cred->cr_group_info = groups_alloc(0);
+	if (cred->cr_group_info == NULL)
+		return SVC_CLOSE; /* kmalloc failure - client must retry */
+
+	/* Put NULL verifier */
+	svc_putnl(resv, RPC_AUTH_NULL);
+	svc_putnl(resv, 0);
+
+	rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
+	return SVC_OK;
+}
+
+static int
+svcauth_null_release(struct svc_rqst *rqstp)
+{
+	if (rqstp->rq_client)
+		auth_domain_put(rqstp->rq_client);
+	rqstp->rq_client = NULL;
+	if (rqstp->rq_cred.cr_group_info)
+		put_group_info(rqstp->rq_cred.cr_group_info);
+	rqstp->rq_cred.cr_group_info = NULL;
+
+	return 0; /* don't drop */
+}
+
+
+struct auth_ops svcauth_null = {
+	.name		= "null",
+	.owner		= THIS_MODULE,
+	.flavour	= RPC_AUTH_NULL,
+	.accept 	= svcauth_null_accept,
+	.release	= svcauth_null_release,
+	.set_client	= svcauth_unix_set_client,
+};
+
+
+static int
+svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
+{
+	struct kvec	*argv = &rqstp->rq_arg.head[0];
+	struct kvec	*resv = &rqstp->rq_res.head[0];
+	struct svc_cred	*cred = &rqstp->rq_cred;
+	u32		slen, i;
+	int		len   = argv->iov_len;
+
+	cred->cr_group_info = NULL;
+	cred->cr_principal = NULL;
+	rqstp->rq_client = NULL;
+
+	if ((len -= 3*4) < 0)
+		return SVC_GARBAGE;
+
+	svc_getu32(argv);			/* length */
+	svc_getu32(argv);			/* time stamp */
+	slen = XDR_QUADLEN(svc_getnl(argv));	/* machname length */
+	if (slen > 64 || (len -= (slen + 3)*4) < 0)
+		goto badcred;
+	argv->iov_base = (void*)((__be32*)argv->iov_base + slen);	/* skip machname */
+	argv->iov_len -= slen*4;
+	/*
+	 * Note: we skip uid_valid()/gid_valid() checks here for
+	 * backwards compatibility with clients that use -1 id's.
+	 * Instead, -1 uid or gid is later mapped to the
+	 * (export-specific) anonymous id by nfsd_setuser.
+	 * Supplementary gid's will be left alone.
+	 */
+	cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
+	cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
+	slen = svc_getnl(argv);			/* gids length */
+	if (slen > 16 || (len -= (slen + 2)*4) < 0)
+		goto badcred;
+	cred->cr_group_info = groups_alloc(slen);
+	if (cred->cr_group_info == NULL)
+		return SVC_CLOSE;
+	for (i = 0; i < slen; i++) {
+		kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
+		GROUP_AT(cred->cr_group_info, i) = kgid;
+	}
+	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
+		*authp = rpc_autherr_badverf;
+		return SVC_DENIED;
+	}
+
+	/* Put NULL verifier */
+	svc_putnl(resv, RPC_AUTH_NULL);
+	svc_putnl(resv, 0);
+
+	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
+	return SVC_OK;
+
+badcred:
+	*authp = rpc_autherr_badcred;
+	return SVC_DENIED;
+}
+
+static int
+svcauth_unix_release(struct svc_rqst *rqstp)
+{
+	/* Verifier (such as it is) is already in place.
+	 */
+	if (rqstp->rq_client)
+		auth_domain_put(rqstp->rq_client);
+	rqstp->rq_client = NULL;
+	if (rqstp->rq_cred.cr_group_info)
+		put_group_info(rqstp->rq_cred.cr_group_info);
+	rqstp->rq_cred.cr_group_info = NULL;
+
+	return 0;
+}
+
+
+struct auth_ops svcauth_unix = {
+	.name		= "unix",
+	.owner		= THIS_MODULE,
+	.flavour	= RPC_AUTH_UNIX,
+	.accept 	= svcauth_unix_accept,
+	.release	= svcauth_unix_release,
+	.domain_release	= svcauth_unix_domain_release,
+	.set_client	= svcauth_unix_set_client,
+};
+
+static struct cache_detail ip_map_cache_template = {
+	.owner		= THIS_MODULE,
+	.hash_size	= IP_HASHMAX,
+	.name		= "auth.unix.ip",
+	.cache_put	= ip_map_put,
+	.cache_request	= ip_map_request,
+	.cache_parse	= ip_map_parse,
+	.cache_show	= ip_map_show,
+	.match		= ip_map_match,
+	.init		= ip_map_init,
+	.update		= update,
+	.alloc		= ip_map_alloc,
+};
+
+int ip_map_cache_create(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd;
+	int err;
+
+	cd = cache_create_net(&ip_map_cache_template, net);
+	if (IS_ERR(cd))
+		return PTR_ERR(cd);
+	err = cache_register_net(cd, net);
+	if (err) {
+		cache_destroy_net(cd, net);
+		return err;
+	}
+	sn->ip_map_cache = cd;
+	return 0;
+}
+
+void ip_map_cache_destroy(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	struct cache_detail *cd = sn->ip_map_cache;
+
+	sn->ip_map_cache = NULL;
+	cache_purge(cd);
+	cache_unregister_net(cd, net);
+	cache_destroy_net(cd, net);
+}
diff --git a/kernel/net/sunrpc/svcsock.c b/kernel/net/sunrpc/svcsock.c
new file mode 100644
index 000000000..0c8120229
--- /dev/null
+++ b/kernel/net/sunrpc/svcsock.c
@@ -0,0 +1,1672 @@
+/*
+ * linux/net/sunrpc/svcsock.c
+ *
+ * These are the RPC server socket internals.
+ *
+ * The server scheduling algorithm does not always distribute the load
+ * evenly when servicing a single client. May need to modify the
+ * svc_xprt_enqueue procedure...
+ *
+ * TCP support is largely untested and may be a little slow. The problem
+ * is that we currently do two separate recvfrom's, one for the 4-byte
+ * record length, and the second for the actual record. This could possibly
+ * be improved by always reading a minimum size of around 100 bytes and
+ * tucking any superfluous bytes away in a temporary store. Still, that
+ * leaves write requests out in the rain. An alternative may be to peek at
+ * the first skb in the queue, and if it matches the next TCP sequence
+ * number, to extract the record marker. Yuck.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/file.h>
+#include <linux/freezer.h>
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/tcp.h>
+#include <net/tcp_states.h>
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+#include <trace/events/skb.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/xprt.h>
+
+#include "sunrpc.h"
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+
+static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
+					 int flags);
+static void		svc_udp_data_ready(struct sock *);
+static int		svc_udp_recvfrom(struct svc_rqst *);
+static int		svc_udp_sendto(struct svc_rqst *);
+static void		svc_sock_detach(struct svc_xprt *);
+static void		svc_tcp_sock_detach(struct svc_xprt *);
+static void		svc_sock_free(struct svc_xprt *);
+
+static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
+					  struct net *, struct sockaddr *,
+					  int, int);
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
+					     struct net *, struct sockaddr *,
+					     int, int);
+static void svc_bc_sock_free(struct svc_xprt *xprt);
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key svc_key[2];
+static struct lock_class_key svc_slock_key[2];
+
+static void svc_reclassify_socket(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	WARN_ON_ONCE(sock_owned_by_user(sk));
+	if (sock_owned_by_user(sk))
+		return;
+
+	switch (sk->sk_family) {
+	case AF_INET:
+		sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
+					      &svc_slock_key[0],
+					      "sk_xprt.xpt_lock-AF_INET-NFSD",
+					      &svc_key[0]);
+		break;
+
+	case AF_INET6:
+		sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
+					      &svc_slock_key[1],
+					      "sk_xprt.xpt_lock-AF_INET6-NFSD",
+					      &svc_key[1]);
+		break;
+
+	default:
+		BUG();
+	}
+}
+#else
+static void svc_reclassify_socket(struct socket *sock)
+{
+}
+#endif
+
+/*
+ * Release an skbuff after use
+ */
+static void svc_release_skb(struct svc_rqst *rqstp)
+{
+	struct sk_buff *skb = rqstp->rq_xprt_ctxt;
+
+	if (skb) {
+		struct svc_sock *svsk =
+			container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+		rqstp->rq_xprt_ctxt = NULL;
+
+		dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
+		skb_free_datagram_locked(svsk->sk_sk, skb);
+	}
+}
+
+union svc_pktinfo_u {
+	struct in_pktinfo pkti;
+	struct in6_pktinfo pkti6;
+};
+#define SVC_PKTINFO_SPACE \
+	CMSG_SPACE(sizeof(union svc_pktinfo_u))
+
+static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
+{
+	struct svc_sock *svsk =
+		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+	switch (svsk->sk_sk->sk_family) {
+	case AF_INET: {
+			struct in_pktinfo *pki = CMSG_DATA(cmh);
+
+			cmh->cmsg_level = SOL_IP;
+			cmh->cmsg_type = IP_PKTINFO;
+			pki->ipi_ifindex = 0;
+			pki->ipi_spec_dst.s_addr =
+				 svc_daddr_in(rqstp)->sin_addr.s_addr;
+			cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+		}
+		break;
+
+	case AF_INET6: {
+			struct in6_pktinfo *pki = CMSG_DATA(cmh);
+			struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
+
+			cmh->cmsg_level = SOL_IPV6;
+			cmh->cmsg_type = IPV6_PKTINFO;
+			pki->ipi6_ifindex = daddr->sin6_scope_id;
+			pki->ipi6_addr = daddr->sin6_addr;
+			cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+		}
+		break;
+	}
+}
+
+/*
+ * send routine intended to be shared by the fore- and back-channel
+ */
+int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
+		    struct page *headpage, unsigned long headoffset,
+		    struct page *tailpage, unsigned long tailoffset)
+{
+	int		result;
+	int		size;
+	struct page	**ppage = xdr->pages;
+	size_t		base = xdr->page_base;
+	unsigned int	pglen = xdr->page_len;
+	unsigned int	flags = MSG_MORE;
+	int		slen;
+	int		len = 0;
+
+	slen = xdr->len;
+
+	/* send head */
+	if (slen == xdr->head[0].iov_len)
+		flags = 0;
+	len = kernel_sendpage(sock, headpage, headoffset,
+				  xdr->head[0].iov_len, flags);
+	if (len != xdr->head[0].iov_len)
+		goto out;
+	slen -= xdr->head[0].iov_len;
+	if (slen == 0)
+		goto out;
+
+	/* send page data */
+	size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
+	while (pglen > 0) {
+		if (slen == size)
+			flags = 0;
+		result = kernel_sendpage(sock, *ppage, base, size, flags);
+		if (result > 0)
+			len += result;
+		if (result != size)
+			goto out;
+		slen -= size;
+		pglen -= size;
+		size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
+		base = 0;
+		ppage++;
+	}
+
+	/* send tail */
+	if (xdr->tail[0].iov_len) {
+		result = kernel_sendpage(sock, tailpage, tailoffset,
+				   xdr->tail[0].iov_len, 0);
+		if (result > 0)
+			len += result;
+	}
+
+out:
+	return len;
+}
+
+
+/*
+ * Generic sendto routine
+ */
+static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
+{
+	struct svc_sock	*svsk =
+		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+	struct socket	*sock = svsk->sk_sock;
+	union {
+		struct cmsghdr	hdr;
+		long		all[SVC_PKTINFO_SPACE / sizeof(long)];
+	} buffer;
+	struct cmsghdr *cmh = &buffer.hdr;
+	int		len = 0;
+	unsigned long tailoff;
+	unsigned long headoff;
+	RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+	if (rqstp->rq_prot == IPPROTO_UDP) {
+		struct msghdr msg = {
+			.msg_name	= &rqstp->rq_addr,
+			.msg_namelen	= rqstp->rq_addrlen,
+			.msg_control	= cmh,
+			.msg_controllen	= sizeof(buffer),
+			.msg_flags	= MSG_MORE,
+		};
+
+		svc_set_cmsg_data(rqstp, cmh);
+
+		if (sock_sendmsg(sock, &msg) < 0)
+			goto out;
+	}
+
+	tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
+	headoff = 0;
+	len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
+			       rqstp->rq_respages[0], tailoff);
+
+out:
+	dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
+		svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
+		xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
+
+	return len;
+}
+
+/*
+ * Report socket names for nfsdfs
+ */
+static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
+{
+	const struct sock *sk = svsk->sk_sk;
+	const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
+							"udp" : "tcp";
+	int len;
+
+	switch (sk->sk_family) {
+	case PF_INET:
+		len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
+				proto_name,
+				&inet_sk(sk)->inet_rcv_saddr,
+				inet_sk(sk)->inet_num);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case PF_INET6:
+		len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
+				proto_name,
+				&sk->sk_v6_rcv_saddr,
+				inet_sk(sk)->inet_num);
+		break;
+#endif
+	default:
+		len = snprintf(buf, remaining, "*unknown-%d*\n",
+				sk->sk_family);
+	}
+
+	if (len >= remaining) {
+		*buf = '\0';
+		return -ENAMETOOLONG;
+	}
+	return len;
+}
+
+/*
+ * Generic recvfrom routine.
+ */
+static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
+			int buflen)
+{
+	struct svc_sock *svsk =
+		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+	struct msghdr msg = {
+		.msg_flags	= MSG_DONTWAIT,
+	};
+	int len;
+
+	rqstp->rq_xprt_hlen = 0;
+
+	clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+	len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
+				msg.msg_flags);
+	/* If we read a full record, then assume there may be more
+	 * data to read (stream based sockets only!)
+	 */
+	if (len == buflen)
+		set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+
+	dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
+		svsk, iov[0].iov_base, iov[0].iov_len, len);
+	return len;
+}
+
+static int svc_partial_recvfrom(struct svc_rqst *rqstp,
+				struct kvec *iov, int nr,
+				int buflen, unsigned int base)
+{
+	size_t save_iovlen;
+	void *save_iovbase;
+	unsigned int i;
+	int ret;
+
+	if (base == 0)
+		return svc_recvfrom(rqstp, iov, nr, buflen);
+
+	for (i = 0; i < nr; i++) {
+		if (iov[i].iov_len > base)
+			break;
+		base -= iov[i].iov_len;
+	}
+	save_iovlen = iov[i].iov_len;
+	save_iovbase = iov[i].iov_base;
+	iov[i].iov_len -= base;
+	iov[i].iov_base += base;
+	ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
+	iov[i].iov_len = save_iovlen;
+	iov[i].iov_base = save_iovbase;
+	return ret;
+}
+
+/*
+ * Set socket snd and rcv buffer lengths
+ */
+static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
+				unsigned int rcv)
+{
+#if 0
+	mm_segment_t	oldfs;
+	oldfs = get_fs(); set_fs(KERNEL_DS);
+	sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
+			(char*)&snd, sizeof(snd));
+	sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
+			(char*)&rcv, sizeof(rcv));
+#else
+	/* sock_setsockopt limits use to sysctl_?mem_max,
+	 * which isn't acceptable.  Until that is made conditional
+	 * on not having CAP_SYS_RESOURCE or similar, we go direct...
+	 * DaveM said I could!
+	 */
+	lock_sock(sock->sk);
+	sock->sk->sk_sndbuf = snd * 2;
+	sock->sk->sk_rcvbuf = rcv * 2;
+	sock->sk->sk_write_space(sock->sk);
+	release_sock(sock->sk);
+#endif
+}
+
+static int svc_sock_secure_port(struct svc_rqst *rqstp)
+{
+	return svc_port_is_privileged(svc_addr(rqstp));
+}
+
+/*
+ * INET callback when data has been received on the socket.
+ */
+static void svc_udp_data_ready(struct sock *sk)
+{
+	struct svc_sock	*svsk = (struct svc_sock *)sk->sk_user_data;
+	wait_queue_head_t *wq = sk_sleep(sk);
+
+	if (svsk) {
+		dprintk("svc: socket %p(inet %p), busy=%d\n",
+			svsk, sk,
+			test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
+		set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+		svc_xprt_enqueue(&svsk->sk_xprt);
+	}
+	if (wq && waitqueue_active(wq))
+		wake_up_interruptible(wq);
+}
+
+/*
+ * INET callback when space is newly available on the socket.
+ */
+static void svc_write_space(struct sock *sk)
+{
+	struct svc_sock	*svsk = (struct svc_sock *)(sk->sk_user_data);
+	wait_queue_head_t *wq = sk_sleep(sk);
+
+	if (svsk) {
+		dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
+			svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
+		svc_xprt_enqueue(&svsk->sk_xprt);
+	}
+
+	if (wq && waitqueue_active(wq)) {
+		dprintk("RPC svc_write_space: someone sleeping on %p\n",
+		       svsk);
+		wake_up_interruptible(wq);
+	}
+}
+
+static int svc_tcp_has_wspace(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk =	container_of(xprt, struct svc_sock, sk_xprt);
+	struct svc_serv *serv = svsk->sk_xprt.xpt_server;
+	int required;
+
+	if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
+		return 1;
+	required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
+	if (sk_stream_wspace(svsk->sk_sk) >= required ||
+	    (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
+	     atomic_read(&xprt->xpt_reserved) == 0))
+		return 1;
+	set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+	return 0;
+}
+
+static void svc_tcp_write_space(struct sock *sk)
+{
+	struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
+	struct socket *sock = sk->sk_socket;
+
+	if (!sk_stream_is_writeable(sk) || !sock)
+		return;
+	if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt))
+		clear_bit(SOCK_NOSPACE, &sock->flags);
+	svc_write_space(sk);
+}
+
+static void svc_tcp_adjust_wspace(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+
+	if (svc_tcp_has_wspace(xprt))
+		clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+}
+
+/*
+ * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
+ */
+static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
+				     struct cmsghdr *cmh)
+{
+	struct in_pktinfo *pki = CMSG_DATA(cmh);
+	struct sockaddr_in *daddr = svc_daddr_in(rqstp);
+
+	if (cmh->cmsg_type != IP_PKTINFO)
+		return 0;
+
+	daddr->sin_family = AF_INET;
+	daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
+	return 1;
+}
+
+/*
+ * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
+ */
+static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
+				     struct cmsghdr *cmh)
+{
+	struct in6_pktinfo *pki = CMSG_DATA(cmh);
+	struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
+
+	if (cmh->cmsg_type != IPV6_PKTINFO)
+		return 0;
+
+	daddr->sin6_family = AF_INET6;
+	daddr->sin6_addr = pki->ipi6_addr;
+	daddr->sin6_scope_id = pki->ipi6_ifindex;
+	return 1;
+}
+
+/*
+ * Copy the UDP datagram's destination address to the rqstp structure.
+ * The 'destination' address in this case is the address to which the
+ * peer sent the datagram, i.e. our local address. For multihomed
+ * hosts, this can change from msg to msg. Note that only the IP
+ * address changes, the port number should remain the same.
+ */
+static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
+				    struct cmsghdr *cmh)
+{
+	switch (cmh->cmsg_level) {
+	case SOL_IP:
+		return svc_udp_get_dest_address4(rqstp, cmh);
+	case SOL_IPV6:
+		return svc_udp_get_dest_address6(rqstp, cmh);
+	}
+
+	return 0;
+}
+
+/*
+ * Receive a datagram from a UDP socket.
+ */
+static int svc_udp_recvfrom(struct svc_rqst *rqstp)
+{
+	struct svc_sock	*svsk =
+		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+	struct svc_serv	*serv = svsk->sk_xprt.xpt_server;
+	struct sk_buff	*skb;
+	union {
+		struct cmsghdr	hdr;
+		long		all[SVC_PKTINFO_SPACE / sizeof(long)];
+	} buffer;
+	struct cmsghdr *cmh = &buffer.hdr;
+	struct msghdr msg = {
+		.msg_name = svc_addr(rqstp),
+		.msg_control = cmh,
+		.msg_controllen = sizeof(buffer),
+		.msg_flags = MSG_DONTWAIT,
+	};
+	size_t len;
+	int err;
+
+	if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
+	    /* udp sockets need large rcvbuf as all pending
+	     * requests are still in that buffer.  sndbuf must
+	     * also be large enough that there is enough space
+	     * for one reply per thread.  We count all threads
+	     * rather than threads in a particular pool, which
+	     * provides an upper bound on the number of threads
+	     * which will access the socket.
+	     */
+	    svc_sock_setbufsize(svsk->sk_sock,
+				(serv->sv_nrthreads+3) * serv->sv_max_mesg,
+				(serv->sv_nrthreads+3) * serv->sv_max_mesg);
+
+	clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+	skb = NULL;
+	err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
+			     0, 0, MSG_PEEK | MSG_DONTWAIT);
+	if (err >= 0)
+		skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
+
+	if (skb == NULL) {
+		if (err != -EAGAIN) {
+			/* possibly an icmp error */
+			dprintk("svc: recvfrom returned error %d\n", -err);
+			set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+		}
+		return 0;
+	}
+	len = svc_addr_len(svc_addr(rqstp));
+	rqstp->rq_addrlen = len;
+	if (skb->tstamp.tv64 == 0) {
+		skb->tstamp = ktime_get_real();
+		/* Don't enable netstamp, sunrpc doesn't
+		   need that much accuracy */
+	}
+	svsk->sk_sk->sk_stamp = skb->tstamp;
+	set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
+
+	len  = skb->len - sizeof(struct udphdr);
+	rqstp->rq_arg.len = len;
+
+	rqstp->rq_prot = IPPROTO_UDP;
+
+	if (!svc_udp_get_dest_address(rqstp, cmh)) {
+		net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
+				     cmh->cmsg_level, cmh->cmsg_type);
+		goto out_free;
+	}
+	rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
+
+	if (skb_is_nonlinear(skb)) {
+		/* we have to copy */
+		local_bh_disable();
+		if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
+			local_bh_enable();
+			/* checksum error */
+			goto out_free;
+		}
+		local_bh_enable();
+		skb_free_datagram_locked(svsk->sk_sk, skb);
+	} else {
+		/* we can use it in-place */
+		rqstp->rq_arg.head[0].iov_base = skb->data +
+			sizeof(struct udphdr);
+		rqstp->rq_arg.head[0].iov_len = len;
+		if (skb_checksum_complete(skb))
+			goto out_free;
+		rqstp->rq_xprt_ctxt = skb;
+	}
+
+	rqstp->rq_arg.page_base = 0;
+	if (len <= rqstp->rq_arg.head[0].iov_len) {
+		rqstp->rq_arg.head[0].iov_len = len;
+		rqstp->rq_arg.page_len = 0;
+		rqstp->rq_respages = rqstp->rq_pages+1;
+	} else {
+		rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
+		rqstp->rq_respages = rqstp->rq_pages + 1 +
+			DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
+	}
+	rqstp->rq_next_page = rqstp->rq_respages+1;
+
+	if (serv->sv_stats)
+		serv->sv_stats->netudpcnt++;
+
+	return len;
+out_free:
+	trace_kfree_skb(skb, svc_udp_recvfrom);
+	skb_free_datagram_locked(svsk->sk_sk, skb);
+	return 0;
+}
+
+static int
+svc_udp_sendto(struct svc_rqst *rqstp)
+{
+	int		error;
+
+	error = svc_sendto(rqstp, &rqstp->rq_res);
+	if (error == -ECONNREFUSED)
+		/* ICMP error on earlier request. */
+		error = svc_sendto(rqstp, &rqstp->rq_res);
+
+	return error;
+}
+
+static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
+{
+}
+
+static int svc_udp_has_wspace(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+	struct svc_serv	*serv = xprt->xpt_server;
+	unsigned long required;
+
+	/*
+	 * Set the SOCK_NOSPACE flag before checking the available
+	 * sock space.
+	 */
+	set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+	required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
+	if (required*2 > sock_wspace(svsk->sk_sk))
+		return 0;
+	clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+	return 1;
+}
+
+static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
+{
+	BUG();
+	return NULL;
+}
+
+static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
+				       struct net *net,
+				       struct sockaddr *sa, int salen,
+				       int flags)
+{
+	return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
+}
+
+static struct svc_xprt_ops svc_udp_ops = {
+	.xpo_create = svc_udp_create,
+	.xpo_recvfrom = svc_udp_recvfrom,
+	.xpo_sendto = svc_udp_sendto,
+	.xpo_release_rqst = svc_release_skb,
+	.xpo_detach = svc_sock_detach,
+	.xpo_free = svc_sock_free,
+	.xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
+	.xpo_has_wspace = svc_udp_has_wspace,
+	.xpo_accept = svc_udp_accept,
+	.xpo_secure_port = svc_sock_secure_port,
+};
+
+static struct svc_xprt_class svc_udp_class = {
+	.xcl_name = "udp",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_udp_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
+	.xcl_ident = XPRT_TRANSPORT_UDP,
+};
+
+static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
+{
+	int err, level, optname, one = 1;
+
+	svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
+		      &svsk->sk_xprt, serv);
+	clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
+	svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
+	svsk->sk_sk->sk_write_space = svc_write_space;
+
+	/* initialise setting must have enough space to
+	 * receive and respond to one request.
+	 * svc_udp_recvfrom will re-adjust if necessary
+	 */
+	svc_sock_setbufsize(svsk->sk_sock,
+			    3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
+			    3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
+
+	/* data might have come in before data_ready set up */
+	set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+	set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
+
+	/* make sure we get destination address info */
+	switch (svsk->sk_sk->sk_family) {
+	case AF_INET:
+		level = SOL_IP;
+		optname = IP_PKTINFO;
+		break;
+	case AF_INET6:
+		level = SOL_IPV6;
+		optname = IPV6_RECVPKTINFO;
+		break;
+	default:
+		BUG();
+	}
+	err = kernel_setsockopt(svsk->sk_sock, level, optname,
+					(char *)&one, sizeof(one));
+	dprintk("svc: kernel_setsockopt returned %d\n", err);
+}
+
+/*
+ * A data_ready event on a listening socket means there's a connection
+ * pending. Do not use state_change as a substitute for it.
+ */
+static void svc_tcp_listen_data_ready(struct sock *sk)
+{
+	struct svc_sock	*svsk = (struct svc_sock *)sk->sk_user_data;
+	wait_queue_head_t *wq;
+
+	dprintk("svc: socket %p TCP (listen) state change %d\n",
+		sk, sk->sk_state);
+
+	/*
+	 * This callback may called twice when a new connection
+	 * is established as a child socket inherits everything
+	 * from a parent LISTEN socket.
+	 * 1) data_ready method of the parent socket will be called
+	 *    when one of child sockets become ESTABLISHED.
+	 * 2) data_ready method of the child socket may be called
+	 *    when it receives data before the socket is accepted.
+	 * In case of 2, we should ignore it silently.
+	 */
+	if (sk->sk_state == TCP_LISTEN) {
+		if (svsk) {
+			set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
+			svc_xprt_enqueue(&svsk->sk_xprt);
+		} else
+			printk("svc: socket %p: no user data\n", sk);
+	}
+
+	wq = sk_sleep(sk);
+	if (wq && waitqueue_active(wq))
+		wake_up_interruptible_all(wq);
+}
+
+/*
+ * A state change on a connected socket means it's dying or dead.
+ */
+static void svc_tcp_state_change(struct sock *sk)
+{
+	struct svc_sock	*svsk = (struct svc_sock *)sk->sk_user_data;
+	wait_queue_head_t *wq = sk_sleep(sk);
+
+	dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
+		sk, sk->sk_state, sk->sk_user_data);
+
+	if (!svsk)
+		printk("svc: socket %p: no user data\n", sk);
+	else {
+		set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
+		svc_xprt_enqueue(&svsk->sk_xprt);
+	}
+	if (wq && waitqueue_active(wq))
+		wake_up_interruptible_all(wq);
+}
+
+static void svc_tcp_data_ready(struct sock *sk)
+{
+	struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
+	wait_queue_head_t *wq = sk_sleep(sk);
+
+	dprintk("svc: socket %p TCP data ready (svsk %p)\n",
+		sk, sk->sk_user_data);
+	if (svsk) {
+		set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+		svc_xprt_enqueue(&svsk->sk_xprt);
+	}
+	if (wq && waitqueue_active(wq))
+		wake_up_interruptible(wq);
+}
+
+/*
+ * Accept a TCP connection
+ */
+static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+	struct sockaddr_storage addr;
+	struct sockaddr	*sin = (struct sockaddr *) &addr;
+	struct svc_serv	*serv = svsk->sk_xprt.xpt_server;
+	struct socket	*sock = svsk->sk_sock;
+	struct socket	*newsock;
+	struct svc_sock	*newsvsk;
+	int		err, slen;
+	RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+	dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
+	if (!sock)
+		return NULL;
+
+	clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
+	err = kernel_accept(sock, &newsock, O_NONBLOCK);
+	if (err < 0) {
+		if (err == -ENOMEM)
+			printk(KERN_WARNING "%s: no more sockets!\n",
+			       serv->sv_name);
+		else if (err != -EAGAIN)
+			net_warn_ratelimited("%s: accept failed (err %d)!\n",
+					     serv->sv_name, -err);
+		return NULL;
+	}
+	set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
+
+	err = kernel_getpeername(newsock, sin, &slen);
+	if (err < 0) {
+		net_warn_ratelimited("%s: peername failed (err %d)!\n",
+				     serv->sv_name, -err);
+		goto failed;		/* aborted connection or whatever */
+	}
+
+	/* Ideally, we would want to reject connections from unauthorized
+	 * hosts here, but when we get encryption, the IP of the host won't
+	 * tell us anything.  For now just warn about unpriv connections.
+	 */
+	if (!svc_port_is_privileged(sin)) {
+		dprintk("%s: connect from unprivileged port: %s\n",
+			serv->sv_name,
+			__svc_print_addr(sin, buf, sizeof(buf)));
+	}
+	dprintk("%s: connect from %s\n", serv->sv_name,
+		__svc_print_addr(sin, buf, sizeof(buf)));
+
+	/* make sure that a write doesn't block forever when
+	 * low on memory
+	 */
+	newsock->sk->sk_sndtimeo = HZ*30;
+
+	newsvsk = svc_setup_socket(serv, newsock,
+				 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
+	if (IS_ERR(newsvsk))
+		goto failed;
+	svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
+	err = kernel_getsockname(newsock, sin, &slen);
+	if (unlikely(err < 0)) {
+		dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
+		slen = offsetof(struct sockaddr, sa_data);
+	}
+	svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
+
+	if (sock_is_loopback(newsock->sk))
+		set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
+	else
+		clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
+	if (serv->sv_stats)
+		serv->sv_stats->nettcpconn++;
+
+	return &newsvsk->sk_xprt;
+
+failed:
+	sock_release(newsock);
+	return NULL;
+}
+
+static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
+{
+	unsigned int i, len, npages;
+
+	if (svsk->sk_datalen == 0)
+		return 0;
+	len = svsk->sk_datalen;
+	npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	for (i = 0; i < npages; i++) {
+		if (rqstp->rq_pages[i] != NULL)
+			put_page(rqstp->rq_pages[i]);
+		BUG_ON(svsk->sk_pages[i] == NULL);
+		rqstp->rq_pages[i] = svsk->sk_pages[i];
+		svsk->sk_pages[i] = NULL;
+	}
+	rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
+	return len;
+}
+
+static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
+{
+	unsigned int i, len, npages;
+
+	if (svsk->sk_datalen == 0)
+		return;
+	len = svsk->sk_datalen;
+	npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	for (i = 0; i < npages; i++) {
+		svsk->sk_pages[i] = rqstp->rq_pages[i];
+		rqstp->rq_pages[i] = NULL;
+	}
+}
+
+static void svc_tcp_clear_pages(struct svc_sock *svsk)
+{
+	unsigned int i, len, npages;
+
+	if (svsk->sk_datalen == 0)
+		goto out;
+	len = svsk->sk_datalen;
+	npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	for (i = 0; i < npages; i++) {
+		if (svsk->sk_pages[i] == NULL) {
+			WARN_ON_ONCE(1);
+			continue;
+		}
+		put_page(svsk->sk_pages[i]);
+		svsk->sk_pages[i] = NULL;
+	}
+out:
+	svsk->sk_tcplen = 0;
+	svsk->sk_datalen = 0;
+}
+
+/*
+ * Receive fragment record header.
+ * If we haven't gotten the record length yet, get the next four bytes.
+ */
+static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = svsk->sk_xprt.xpt_server;
+	unsigned int want;
+	int len;
+
+	if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
+		struct kvec	iov;
+
+		want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
+		iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
+		iov.iov_len  = want;
+		if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
+			goto error;
+		svsk->sk_tcplen += len;
+
+		if (len < want) {
+			dprintk("svc: short recvfrom while reading record "
+				"length (%d of %d)\n", len, want);
+			return -EAGAIN;
+		}
+
+		dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
+		if (svc_sock_reclen(svsk) + svsk->sk_datalen >
+							serv->sv_max_mesg) {
+			net_notice_ratelimited("RPC: fragment too large: %d\n",
+					svc_sock_reclen(svsk));
+			goto err_delete;
+		}
+	}
+
+	return svc_sock_reclen(svsk);
+error:
+	dprintk("RPC: TCP recv_record got %d\n", len);
+	return len;
+err_delete:
+	set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
+	return -EAGAIN;
+}
+
+static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
+{
+	struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
+	struct rpc_rqst *req = NULL;
+	struct kvec *src, *dst;
+	__be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
+	__be32 xid;
+	__be32 calldir;
+
+	xid = *p++;
+	calldir = *p;
+
+	if (!bc_xprt)
+		return -EAGAIN;
+	spin_lock_bh(&bc_xprt->transport_lock);
+	req = xprt_lookup_rqst(bc_xprt, xid);
+	if (!req)
+		goto unlock_notfound;
+
+	memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
+	/*
+	 * XXX!: cheating for now!  Only copying HEAD.
+	 * But we know this is good enough for now (in fact, for any
+	 * callback reply in the forseeable future).
+	 */
+	dst = &req->rq_private_buf.head[0];
+	src = &rqstp->rq_arg.head[0];
+	if (dst->iov_len < src->iov_len)
+		goto unlock_eagain; /* whatever; just giving up. */
+	memcpy(dst->iov_base, src->iov_base, src->iov_len);
+	xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
+	rqstp->rq_arg.len = 0;
+	spin_unlock_bh(&bc_xprt->transport_lock);
+	return 0;
+unlock_notfound:
+	printk(KERN_NOTICE
+		"%s: Got unrecognized reply: "
+		"calldir 0x%x xpt_bc_xprt %p xid %08x\n",
+		__func__, ntohl(calldir),
+		bc_xprt, ntohl(xid));
+unlock_eagain:
+	spin_unlock_bh(&bc_xprt->transport_lock);
+	return -EAGAIN;
+}
+
+static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
+{
+	int i = 0;
+	int t = 0;
+
+	while (t < len) {
+		vec[i].iov_base = page_address(pages[i]);
+		vec[i].iov_len = PAGE_SIZE;
+		i++;
+		t += PAGE_SIZE;
+	}
+	return i;
+}
+
+static void svc_tcp_fragment_received(struct svc_sock *svsk)
+{
+	/* If we have more data, signal svc_xprt_enqueue() to try again */
+	dprintk("svc: TCP %s record (%d bytes)\n",
+		svc_sock_final_rec(svsk) ? "final" : "nonfinal",
+		svc_sock_reclen(svsk));
+	svsk->sk_tcplen = 0;
+	svsk->sk_reclen = 0;
+}
+
+/*
+ * Receive data from a TCP socket.
+ */
+static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
+{
+	struct svc_sock	*svsk =
+		container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+	struct svc_serv	*serv = svsk->sk_xprt.xpt_server;
+	int		len;
+	struct kvec *vec;
+	unsigned int want, base;
+	__be32 *p;
+	__be32 calldir;
+	int pnum;
+
+	dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
+		svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
+		test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
+		test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
+
+	len = svc_tcp_recv_record(svsk, rqstp);
+	if (len < 0)
+		goto error;
+
+	base = svc_tcp_restore_pages(svsk, rqstp);
+	want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
+
+	vec = rqstp->rq_vec;
+
+	pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
+						svsk->sk_datalen + want);
+
+	rqstp->rq_respages = &rqstp->rq_pages[pnum];
+	rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+	/* Now receive data */
+	len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
+	if (len >= 0) {
+		svsk->sk_tcplen += len;
+		svsk->sk_datalen += len;
+	}
+	if (len != want || !svc_sock_final_rec(svsk)) {
+		svc_tcp_save_pages(svsk, rqstp);
+		if (len < 0 && len != -EAGAIN)
+			goto err_delete;
+		if (len == want)
+			svc_tcp_fragment_received(svsk);
+		else
+			dprintk("svc: incomplete TCP record (%d of %d)\n",
+				(int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
+				svc_sock_reclen(svsk));
+		goto err_noclose;
+	}
+
+	if (svsk->sk_datalen < 8) {
+		svsk->sk_datalen = 0;
+		goto err_delete; /* client is nuts. */
+	}
+
+	rqstp->rq_arg.len = svsk->sk_datalen;
+	rqstp->rq_arg.page_base = 0;
+	if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
+		rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
+		rqstp->rq_arg.page_len = 0;
+	} else
+		rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
+
+	rqstp->rq_xprt_ctxt   = NULL;
+	rqstp->rq_prot	      = IPPROTO_TCP;
+	if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
+		set_bit(RQ_LOCAL, &rqstp->rq_flags);
+	else
+		clear_bit(RQ_LOCAL, &rqstp->rq_flags);
+
+	p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
+	calldir = p[1];
+	if (calldir)
+		len = receive_cb_reply(svsk, rqstp);
+
+	/* Reset TCP read info */
+	svsk->sk_datalen = 0;
+	svc_tcp_fragment_received(svsk);
+
+	if (len < 0)
+		goto error;
+
+	svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
+	if (serv->sv_stats)
+		serv->sv_stats->nettcpcnt++;
+
+	return rqstp->rq_arg.len;
+
+error:
+	if (len != -EAGAIN)
+		goto err_delete;
+	dprintk("RPC: TCP recvfrom got EAGAIN\n");
+	return 0;
+err_delete:
+	printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
+	       svsk->sk_xprt.xpt_server->sv_name, -len);
+	set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
+err_noclose:
+	return 0;	/* record not complete */
+}
+
+/*
+ * Send out data on TCP socket.
+ */
+static int svc_tcp_sendto(struct svc_rqst *rqstp)
+{
+	struct xdr_buf	*xbufp = &rqstp->rq_res;
+	int sent;
+	__be32 reclen;
+
+	/* Set up the first element of the reply kvec.
+	 * Any other kvecs that may be in use have been taken
+	 * care of by the server implementation itself.
+	 */
+	reclen = htonl(0x80000000|((xbufp->len ) - 4));
+	memcpy(xbufp->head[0].iov_base, &reclen, 4);
+
+	sent = svc_sendto(rqstp, &rqstp->rq_res);
+	if (sent != xbufp->len) {
+		printk(KERN_NOTICE
+		       "rpc-srv/tcp: %s: %s %d when sending %d bytes "
+		       "- shutting down socket\n",
+		       rqstp->rq_xprt->xpt_server->sv_name,
+		       (sent<0)?"got error":"sent only",
+		       sent, xbufp->len);
+		set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
+		svc_xprt_enqueue(rqstp->rq_xprt);
+		sent = -EAGAIN;
+	}
+	return sent;
+}
+
+/*
+ * Setup response header. TCP has a 4B record length field.
+ */
+static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
+{
+	struct kvec *resv = &rqstp->rq_res.head[0];
+
+	/* tcp needs a space for the record length... */
+	svc_putnl(resv, 0);
+}
+
+static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
+				       struct net *net,
+				       struct sockaddr *sa, int salen,
+				       int flags)
+{
+	return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
+					     struct net *, struct sockaddr *,
+					     int, int);
+static void svc_bc_sock_free(struct svc_xprt *xprt);
+
+static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
+				       struct net *net,
+				       struct sockaddr *sa, int salen,
+				       int flags)
+{
+	return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
+}
+
+static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
+{
+}
+
+static struct svc_xprt_ops svc_tcp_bc_ops = {
+	.xpo_create = svc_bc_tcp_create,
+	.xpo_detach = svc_bc_tcp_sock_detach,
+	.xpo_free = svc_bc_sock_free,
+	.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
+	.xpo_secure_port = svc_sock_secure_port,
+};
+
+static struct svc_xprt_class svc_tcp_bc_class = {
+	.xcl_name = "tcp-bc",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_tcp_bc_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
+};
+
+static void svc_init_bc_xprt_sock(void)
+{
+	svc_reg_xprt_class(&svc_tcp_bc_class);
+}
+
+static void svc_cleanup_bc_xprt_sock(void)
+{
+	svc_unreg_xprt_class(&svc_tcp_bc_class);
+}
+#else /* CONFIG_SUNRPC_BACKCHANNEL */
+static void svc_init_bc_xprt_sock(void)
+{
+}
+
+static void svc_cleanup_bc_xprt_sock(void)
+{
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+static struct svc_xprt_ops svc_tcp_ops = {
+	.xpo_create = svc_tcp_create,
+	.xpo_recvfrom = svc_tcp_recvfrom,
+	.xpo_sendto = svc_tcp_sendto,
+	.xpo_release_rqst = svc_release_skb,
+	.xpo_detach = svc_tcp_sock_detach,
+	.xpo_free = svc_sock_free,
+	.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
+	.xpo_has_wspace = svc_tcp_has_wspace,
+	.xpo_accept = svc_tcp_accept,
+	.xpo_secure_port = svc_sock_secure_port,
+	.xpo_adjust_wspace = svc_tcp_adjust_wspace,
+};
+
+static struct svc_xprt_class svc_tcp_class = {
+	.xcl_name = "tcp",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_tcp_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
+	.xcl_ident = XPRT_TRANSPORT_TCP,
+};
+
+void svc_init_xprt_sock(void)
+{
+	svc_reg_xprt_class(&svc_tcp_class);
+	svc_reg_xprt_class(&svc_udp_class);
+	svc_init_bc_xprt_sock();
+}
+
+void svc_cleanup_xprt_sock(void)
+{
+	svc_unreg_xprt_class(&svc_tcp_class);
+	svc_unreg_xprt_class(&svc_udp_class);
+	svc_cleanup_bc_xprt_sock();
+}
+
+static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
+{
+	struct sock	*sk = svsk->sk_sk;
+
+	svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
+		      &svsk->sk_xprt, serv);
+	set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
+	if (sk->sk_state == TCP_LISTEN) {
+		dprintk("setting up TCP socket for listening\n");
+		set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
+		sk->sk_data_ready = svc_tcp_listen_data_ready;
+		set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
+	} else {
+		dprintk("setting up TCP socket for reading\n");
+		sk->sk_state_change = svc_tcp_state_change;
+		sk->sk_data_ready = svc_tcp_data_ready;
+		sk->sk_write_space = svc_tcp_write_space;
+
+		svsk->sk_reclen = 0;
+		svsk->sk_tcplen = 0;
+		svsk->sk_datalen = 0;
+		memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
+
+		tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+		set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+		if (sk->sk_state != TCP_ESTABLISHED)
+			set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
+	}
+}
+
+void svc_sock_update_bufs(struct svc_serv *serv)
+{
+	/*
+	 * The number of server threads has changed. Update
+	 * rcvbuf and sndbuf accordingly on all sockets
+	 */
+	struct svc_sock *svsk;
+
+	spin_lock_bh(&serv->sv_lock);
+	list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
+		set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
+	spin_unlock_bh(&serv->sv_lock);
+}
+EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
+
+/*
+ * Initialize socket for RPC use and create svc_sock struct
+ * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
+ */
+static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
+						struct socket *sock,
+						int flags)
+{
+	struct svc_sock	*svsk;
+	struct sock	*inet;
+	int		pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
+	int		err = 0;
+
+	dprintk("svc: svc_setup_socket %p\n", sock);
+	svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
+	if (!svsk)
+		return ERR_PTR(-ENOMEM);
+
+	inet = sock->sk;
+
+	/* Register socket with portmapper */
+	if (pmap_register)
+		err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
+				     inet->sk_protocol,
+				     ntohs(inet_sk(inet)->inet_sport));
+
+	if (err < 0) {
+		kfree(svsk);
+		return ERR_PTR(err);
+	}
+
+	inet->sk_user_data = svsk;
+	svsk->sk_sock = sock;
+	svsk->sk_sk = inet;
+	svsk->sk_ostate = inet->sk_state_change;
+	svsk->sk_odata = inet->sk_data_ready;
+	svsk->sk_owspace = inet->sk_write_space;
+
+	/* Initialize the socket */
+	if (sock->type == SOCK_DGRAM)
+		svc_udp_init(svsk, serv);
+	else {
+		/* initialise setting must have enough space to
+		 * receive and respond to one request.
+		 */
+		svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
+					4 * serv->sv_max_mesg);
+		svc_tcp_init(svsk, serv);
+	}
+
+	dprintk("svc: svc_setup_socket created %p (inet %p)\n",
+				svsk, svsk->sk_sk);
+
+	return svsk;
+}
+
+bool svc_alien_sock(struct net *net, int fd)
+{
+	int err;
+	struct socket *sock = sockfd_lookup(fd, &err);
+	bool ret = false;
+
+	if (!sock)
+		goto out;
+	if (sock_net(sock->sk) != net)
+		ret = true;
+	sockfd_put(sock);
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(svc_alien_sock);
+
+/**
+ * svc_addsock - add a listener socket to an RPC service
+ * @serv: pointer to RPC service to which to add a new listener
+ * @fd: file descriptor of the new listener
+ * @name_return: pointer to buffer to fill in with name of listener
+ * @len: size of the buffer
+ *
+ * Fills in socket name and returns positive length of name if successful.
+ * Name is terminated with '\n'.  On error, returns a negative errno
+ * value.
+ */
+int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
+		const size_t len)
+{
+	int err = 0;
+	struct socket *so = sockfd_lookup(fd, &err);
+	struct svc_sock *svsk = NULL;
+	struct sockaddr_storage addr;
+	struct sockaddr *sin = (struct sockaddr *)&addr;
+	int salen;
+
+	if (!so)
+		return err;
+	err = -EAFNOSUPPORT;
+	if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
+		goto out;
+	err =  -EPROTONOSUPPORT;
+	if (so->sk->sk_protocol != IPPROTO_TCP &&
+	    so->sk->sk_protocol != IPPROTO_UDP)
+		goto out;
+	err = -EISCONN;
+	if (so->state > SS_UNCONNECTED)
+		goto out;
+	err = -ENOENT;
+	if (!try_module_get(THIS_MODULE))
+		goto out;
+	svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
+	if (IS_ERR(svsk)) {
+		module_put(THIS_MODULE);
+		err = PTR_ERR(svsk);
+		goto out;
+	}
+	if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
+		svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
+	svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
+	return svc_one_sock_name(svsk, name_return, len);
+out:
+	sockfd_put(so);
+	return err;
+}
+EXPORT_SYMBOL_GPL(svc_addsock);
+
+/*
+ * Create socket for RPC service.
+ */
+static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
+					  int protocol,
+					  struct net *net,
+					  struct sockaddr *sin, int len,
+					  int flags)
+{
+	struct svc_sock	*svsk;
+	struct socket	*sock;
+	int		error;
+	int		type;
+	struct sockaddr_storage addr;
+	struct sockaddr *newsin = (struct sockaddr *)&addr;
+	int		newlen;
+	int		family;
+	int		val;
+	RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+	dprintk("svc: svc_create_socket(%s, %d, %s)\n",
+			serv->sv_program->pg_name, protocol,
+			__svc_print_addr(sin, buf, sizeof(buf)));
+
+	if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
+		printk(KERN_WARNING "svc: only UDP and TCP "
+				"sockets supported\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
+	switch (sin->sa_family) {
+	case AF_INET6:
+		family = PF_INET6;
+		break;
+	case AF_INET:
+		family = PF_INET;
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+
+	error = __sock_create(net, family, type, protocol, &sock, 1);
+	if (error < 0)
+		return ERR_PTR(error);
+
+	svc_reclassify_socket(sock);
+
+	/*
+	 * If this is an PF_INET6 listener, we want to avoid
+	 * getting requests from IPv4 remotes.  Those should
+	 * be shunted to a PF_INET listener via rpcbind.
+	 */
+	val = 1;
+	if (family == PF_INET6)
+		kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+					(char *)&val, sizeof(val));
+
+	if (type == SOCK_STREAM)
+		sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
+	error = kernel_bind(sock, sin, len);
+	if (error < 0)
+		goto bummer;
+
+	newlen = len;
+	error = kernel_getsockname(sock, newsin, &newlen);
+	if (error < 0)
+		goto bummer;
+
+	if (protocol == IPPROTO_TCP) {
+		if ((error = kernel_listen(sock, 64)) < 0)
+			goto bummer;
+	}
+
+	svsk = svc_setup_socket(serv, sock, flags);
+	if (IS_ERR(svsk)) {
+		error = PTR_ERR(svsk);
+		goto bummer;
+	}
+	svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
+	return (struct svc_xprt *)svsk;
+bummer:
+	dprintk("svc: svc_create_socket error = %d\n", -error);
+	sock_release(sock);
+	return ERR_PTR(error);
+}
+
+/*
+ * Detach the svc_sock from the socket so that no
+ * more callbacks occur.
+ */
+static void svc_sock_detach(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+	struct sock *sk = svsk->sk_sk;
+	wait_queue_head_t *wq;
+
+	dprintk("svc: svc_sock_detach(%p)\n", svsk);
+
+	/* put back the old socket callbacks */
+	sk->sk_state_change = svsk->sk_ostate;
+	sk->sk_data_ready = svsk->sk_odata;
+	sk->sk_write_space = svsk->sk_owspace;
+
+	wq = sk_sleep(sk);
+	if (wq && waitqueue_active(wq))
+		wake_up_interruptible(wq);
+}
+
+/*
+ * Disconnect the socket, and reset the callbacks
+ */
+static void svc_tcp_sock_detach(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+
+	dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
+
+	svc_sock_detach(xprt);
+
+	if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
+		svc_tcp_clear_pages(svsk);
+		kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
+	}
+}
+
+/*
+ * Free the svc_sock's socket resources and the svc_sock itself.
+ */
+static void svc_sock_free(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+	dprintk("svc: svc_sock_free(%p)\n", svsk);
+
+	if (svsk->sk_sock->file)
+		sockfd_put(svsk->sk_sock);
+	else
+		sock_release(svsk->sk_sock);
+	kfree(svsk);
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Create a back channel svc_xprt which shares the fore channel socket.
+ */
+static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
+					     int protocol,
+					     struct net *net,
+					     struct sockaddr *sin, int len,
+					     int flags)
+{
+	struct svc_sock *svsk;
+	struct svc_xprt *xprt;
+
+	if (protocol != IPPROTO_TCP) {
+		printk(KERN_WARNING "svc: only TCP sockets"
+			" supported on shared back channel\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
+	if (!svsk)
+		return ERR_PTR(-ENOMEM);
+
+	xprt = &svsk->sk_xprt;
+	svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
+
+	serv->sv_bc_xprt = xprt;
+
+	return xprt;
+}
+
+/*
+ * Free a back channel svc_sock.
+ */
+static void svc_bc_sock_free(struct svc_xprt *xprt)
+{
+	if (xprt)
+		kfree(container_of(xprt, struct svc_sock, sk_xprt));
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
diff --git a/kernel/net/sunrpc/sysctl.c b/kernel/net/sunrpc/sysctl.c
new file mode 100644
index 000000000..887f0183b
--- /dev/null
+++ b/kernel/net/sunrpc/sysctl.c
@@ -0,0 +1,185 @@
+/*
+ * linux/net/sunrpc/sysctl.c
+ *
+ * Sysctl interface to sunrpc module.
+ *
+ * I would prefer to register the sunrpc table below sys/net, but that's
+ * impossible at the moment.
+ */
+
+#include <linux/types.h>
+#include <linux/linkage.h>
+#include <linux/ctype.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/module.h>
+
+#include <asm/uaccess.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#include "netns.h"
+
+/*
+ * Declare the debug flags here
+ */
+unsigned int	rpc_debug;
+EXPORT_SYMBOL_GPL(rpc_debug);
+
+unsigned int	nfs_debug;
+EXPORT_SYMBOL_GPL(nfs_debug);
+
+unsigned int	nfsd_debug;
+EXPORT_SYMBOL_GPL(nfsd_debug);
+
+unsigned int	nlm_debug;
+EXPORT_SYMBOL_GPL(nlm_debug);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+
+static struct ctl_table_header *sunrpc_table_header;
+static struct ctl_table sunrpc_table[];
+
+void
+rpc_register_sysctl(void)
+{
+	if (!sunrpc_table_header)
+		sunrpc_table_header = register_sysctl_table(sunrpc_table);
+}
+
+void
+rpc_unregister_sysctl(void)
+{
+	if (sunrpc_table_header) {
+		unregister_sysctl_table(sunrpc_table_header);
+		sunrpc_table_header = NULL;
+	}
+}
+
+static int proc_do_xprt(struct ctl_table *table, int write,
+			void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	char tmpbuf[256];
+	size_t len;
+
+	if ((*ppos && !write) || !*lenp) {
+		*lenp = 0;
+		return 0;
+	}
+	len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
+	return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
+}
+
+static int
+proc_dodebug(struct ctl_table *table, int write,
+				void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	char		tmpbuf[20], c, *s;
+	char __user *p;
+	unsigned int	value;
+	size_t		left, len;
+
+	if ((*ppos && !write) || !*lenp) {
+		*lenp = 0;
+		return 0;
+	}
+
+	left = *lenp;
+
+	if (write) {
+		if (!access_ok(VERIFY_READ, buffer, left))
+			return -EFAULT;
+		p = buffer;
+		while (left && __get_user(c, p) >= 0 && isspace(c))
+			left--, p++;
+		if (!left)
+			goto done;
+
+		if (left > sizeof(tmpbuf) - 1)
+			return -EINVAL;
+		if (copy_from_user(tmpbuf, p, left))
+			return -EFAULT;
+		tmpbuf[left] = '\0';
+
+		for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
+			value = 10 * value + (*s - '0');
+		if (*s && !isspace(*s))
+			return -EINVAL;
+		while (left && isspace(*s))
+			left--, s++;
+		*(unsigned int *) table->data = value;
+		/* Display the RPC tasks on writing to rpc_debug */
+		if (strcmp(table->procname, "rpc_debug") == 0)
+			rpc_show_tasks(&init_net);
+	} else {
+		if (!access_ok(VERIFY_WRITE, buffer, left))
+			return -EFAULT;
+		len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
+		if (len > left)
+			len = left;
+		if (__copy_to_user(buffer, tmpbuf, len))
+			return -EFAULT;
+		if ((left -= len) > 0) {
+			if (put_user('\n', (char __user *)buffer + len))
+				return -EFAULT;
+			left--;
+		}
+	}
+
+done:
+	*lenp -= left;
+	*ppos += *lenp;
+	return 0;
+}
+
+
+static struct ctl_table debug_table[] = {
+	{
+		.procname	= "rpc_debug",
+		.data		= &rpc_debug,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dodebug
+	},
+	{
+		.procname	= "nfs_debug",
+		.data		= &nfs_debug,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dodebug
+	},
+	{
+		.procname	= "nfsd_debug",
+		.data		= &nfsd_debug,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dodebug
+	},
+	{
+		.procname	= "nlm_debug",
+		.data		= &nlm_debug,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dodebug
+	},
+	{
+		.procname	= "transports",
+		.maxlen		= 256,
+		.mode		= 0444,
+		.proc_handler	= proc_do_xprt,
+	},
+	{ }
+};
+
+static struct ctl_table sunrpc_table[] = {
+	{
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= debug_table
+	},
+	{ }
+};
+
+#endif
diff --git a/kernel/net/sunrpc/timer.c b/kernel/net/sunrpc/timer.c
new file mode 100644
index 000000000..08881d0c9
--- /dev/null
+++ b/kernel/net/sunrpc/timer.c
@@ -0,0 +1,122 @@
+/*
+ * linux/net/sunrpc/timer.c
+ *
+ * Estimate RPC request round trip time.
+ *
+ * Based on packet round-trip and variance estimator algorithms described
+ * in appendix A of "Congestion Avoidance and Control" by Van Jacobson
+ * and Michael J. Karels (ACM Computer Communication Review; Proceedings
+ * of the Sigcomm '88 Symposium in Stanford, CA, August, 1988).
+ *
+ * This RTT estimator is used only for RPC over datagram protocols.
+ *
+ * Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
+ */
+
+#include <asm/param.h>
+
+#include <linux/types.h>
+#include <linux/unistd.h>
+#include <linux/module.h>
+
+#include <linux/sunrpc/clnt.h>
+
+#define RPC_RTO_MAX (60*HZ)
+#define RPC_RTO_INIT (HZ/5)
+#define RPC_RTO_MIN (HZ/10)
+
+/**
+ * rpc_init_rtt - Initialize an RPC RTT estimator context
+ * @rt: context to initialize
+ * @timeo: initial timeout value, in jiffies
+ *
+ */
+void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo)
+{
+	unsigned long init = 0;
+	unsigned int i;
+
+	rt->timeo = timeo;
+
+	if (timeo > RPC_RTO_INIT)
+		init = (timeo - RPC_RTO_INIT) << 3;
+	for (i = 0; i < 5; i++) {
+		rt->srtt[i] = init;
+		rt->sdrtt[i] = RPC_RTO_INIT;
+		rt->ntimeouts[i] = 0;
+	}
+}
+EXPORT_SYMBOL_GPL(rpc_init_rtt);
+
+/**
+ * rpc_update_rtt - Update an RPC RTT estimator context
+ * @rt: context to update
+ * @timer: timer array index (request type)
+ * @m: recent actual RTT, in jiffies
+ *
+ * NB: When computing the smoothed RTT and standard deviation,
+ *     be careful not to produce negative intermediate results.
+ */
+void rpc_update_rtt(struct rpc_rtt *rt, unsigned int timer, long m)
+{
+	long *srtt, *sdrtt;
+
+	if (timer-- == 0)
+		return;
+
+	/* jiffies wrapped; ignore this one */
+	if (m < 0)
+		return;
+
+	if (m == 0)
+		m = 1L;
+
+	srtt = (long *)&rt->srtt[timer];
+	m -= *srtt >> 3;
+	*srtt += m;
+
+	if (m < 0)
+		m = -m;
+
+	sdrtt = (long *)&rt->sdrtt[timer];
+	m -= *sdrtt >> 2;
+	*sdrtt += m;
+
+	/* Set lower bound on the variance */
+	if (*sdrtt < RPC_RTO_MIN)
+		*sdrtt = RPC_RTO_MIN;
+}
+EXPORT_SYMBOL_GPL(rpc_update_rtt);
+
+/**
+ * rpc_calc_rto - Provide an estimated timeout value
+ * @rt: context to use for calculation
+ * @timer: timer array index (request type)
+ *
+ * Estimate RTO for an NFS RPC sent via an unreliable datagram.  Use
+ * the mean and mean deviation of RTT for the appropriate type of RPC
+ * for frequently issued RPCs, and a fixed default for the others.
+ *
+ * The justification for doing "other" this way is that these RPCs
+ * happen so infrequently that timer estimation would probably be
+ * stale.  Also, since many of these RPCs are non-idempotent, a
+ * conservative timeout is desired.
+ *
+ * getattr, lookup,
+ * read, write, commit     - A+4D
+ * other                   - timeo
+ */
+unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned int timer)
+{
+	unsigned long res;
+
+	if (timer-- == 0)
+		return rt->timeo;
+
+	res = ((rt->srtt[timer] + 7) >> 3) + rt->sdrtt[timer];
+	if (res > RPC_RTO_MAX)
+		res = RPC_RTO_MAX;
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(rpc_calc_rto);
diff --git a/kernel/net/sunrpc/xdr.c b/kernel/net/sunrpc/xdr.c
new file mode 100644
index 000000000..4439ac4c1
--- /dev/null
+++ b/kernel/net/sunrpc/xdr.c
@@ -0,0 +1,1515 @@
+/*
+ * linux/net/sunrpc/xdr.c
+ *
+ * Generic XDR support.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+
+/*
+ * XDR functions for basic NFS types
+ */
+__be32 *
+xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj)
+{
+	unsigned int	quadlen = XDR_QUADLEN(obj->len);
+
+	p[quadlen] = 0;		/* zero trailing bytes */
+	*p++ = cpu_to_be32(obj->len);
+	memcpy(p, obj->data, obj->len);
+	return p + XDR_QUADLEN(obj->len);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_netobj);
+
+__be32 *
+xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj)
+{
+	unsigned int	len;
+
+	if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ)
+		return NULL;
+	obj->len  = len;
+	obj->data = (u8 *) p;
+	return p + XDR_QUADLEN(len);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_netobj);
+
+/**
+ * xdr_encode_opaque_fixed - Encode fixed length opaque data
+ * @p: pointer to current position in XDR buffer.
+ * @ptr: pointer to data to encode (or NULL)
+ * @nbytes: size of data.
+ *
+ * Copy the array of data of length nbytes at ptr to the XDR buffer
+ * at position p, then align to the next 32-bit boundary by padding
+ * with zero bytes (see RFC1832).
+ * Note: if ptr is NULL, only the padding is performed.
+ *
+ * Returns the updated current XDR buffer position
+ *
+ */
+__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes)
+{
+	if (likely(nbytes != 0)) {
+		unsigned int quadlen = XDR_QUADLEN(nbytes);
+		unsigned int padding = (quadlen << 2) - nbytes;
+
+		if (ptr != NULL)
+			memcpy(p, ptr, nbytes);
+		if (padding != 0)
+			memset((char *)p + nbytes, 0, padding);
+		p += quadlen;
+	}
+	return p;
+}
+EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed);
+
+/**
+ * xdr_encode_opaque - Encode variable length opaque data
+ * @p: pointer to current position in XDR buffer.
+ * @ptr: pointer to data to encode (or NULL)
+ * @nbytes: size of data.
+ *
+ * Returns the updated current XDR buffer position
+ */
+__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes)
+{
+	*p++ = cpu_to_be32(nbytes);
+	return xdr_encode_opaque_fixed(p, ptr, nbytes);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_opaque);
+
+__be32 *
+xdr_encode_string(__be32 *p, const char *string)
+{
+	return xdr_encode_array(p, string, strlen(string));
+}
+EXPORT_SYMBOL_GPL(xdr_encode_string);
+
+__be32 *
+xdr_decode_string_inplace(__be32 *p, char **sp,
+			  unsigned int *lenp, unsigned int maxlen)
+{
+	u32 len;
+
+	len = be32_to_cpu(*p++);
+	if (len > maxlen)
+		return NULL;
+	*lenp = len;
+	*sp = (char *) p;
+	return p + XDR_QUADLEN(len);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_string_inplace);
+
+/**
+ * xdr_terminate_string - '\0'-terminate a string residing in an xdr_buf
+ * @buf: XDR buffer where string resides
+ * @len: length of string, in bytes
+ *
+ */
+void
+xdr_terminate_string(struct xdr_buf *buf, const u32 len)
+{
+	char *kaddr;
+
+	kaddr = kmap_atomic(buf->pages[0]);
+	kaddr[buf->page_base + len] = '\0';
+	kunmap_atomic(kaddr);
+}
+EXPORT_SYMBOL_GPL(xdr_terminate_string);
+
+void
+xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
+		 struct page **pages, unsigned int base, unsigned int len)
+{
+	struct kvec *head = xdr->head;
+	struct kvec *tail = xdr->tail;
+	char *buf = (char *)head->iov_base;
+	unsigned int buflen = head->iov_len;
+
+	head->iov_len  = offset;
+
+	xdr->pages = pages;
+	xdr->page_base = base;
+	xdr->page_len = len;
+
+	tail->iov_base = buf + offset;
+	tail->iov_len = buflen - offset;
+
+	xdr->buflen += len;
+}
+EXPORT_SYMBOL_GPL(xdr_inline_pages);
+
+/*
+ * Helper routines for doing 'memmove' like operations on a struct xdr_buf
+ */
+
+/**
+ * _shift_data_right_pages
+ * @pages: vector of pages containing both the source and dest memory area.
+ * @pgto_base: page vector address of destination
+ * @pgfrom_base: page vector address of source
+ * @len: number of bytes to copy
+ *
+ * Note: the addresses pgto_base and pgfrom_base are both calculated in
+ *       the same way:
+ *            if a memory area starts at byte 'base' in page 'pages[i]',
+ *            then its address is given as (i << PAGE_CACHE_SHIFT) + base
+ * Also note: pgfrom_base must be < pgto_base, but the memory areas
+ * 	they point to may overlap.
+ */
+static void
+_shift_data_right_pages(struct page **pages, size_t pgto_base,
+		size_t pgfrom_base, size_t len)
+{
+	struct page **pgfrom, **pgto;
+	char *vfrom, *vto;
+	size_t copy;
+
+	BUG_ON(pgto_base <= pgfrom_base);
+
+	pgto_base += len;
+	pgfrom_base += len;
+
+	pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT);
+	pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT);
+
+	pgto_base &= ~PAGE_CACHE_MASK;
+	pgfrom_base &= ~PAGE_CACHE_MASK;
+
+	do {
+		/* Are any pointers crossing a page boundary? */
+		if (pgto_base == 0) {
+			pgto_base = PAGE_CACHE_SIZE;
+			pgto--;
+		}
+		if (pgfrom_base == 0) {
+			pgfrom_base = PAGE_CACHE_SIZE;
+			pgfrom--;
+		}
+
+		copy = len;
+		if (copy > pgto_base)
+			copy = pgto_base;
+		if (copy > pgfrom_base)
+			copy = pgfrom_base;
+		pgto_base -= copy;
+		pgfrom_base -= copy;
+
+		vto = kmap_atomic(*pgto);
+		if (*pgto != *pgfrom) {
+			vfrom = kmap_atomic(*pgfrom);
+			memcpy(vto + pgto_base, vfrom + pgfrom_base, copy);
+			kunmap_atomic(vfrom);
+		} else
+			memmove(vto + pgto_base, vto + pgfrom_base, copy);
+		flush_dcache_page(*pgto);
+		kunmap_atomic(vto);
+
+	} while ((len -= copy) != 0);
+}
+
+/**
+ * _copy_to_pages
+ * @pages: array of pages
+ * @pgbase: page vector address of destination
+ * @p: pointer to source data
+ * @len: length
+ *
+ * Copies data from an arbitrary memory location into an array of pages
+ * The copy is assumed to be non-overlapping.
+ */
+static void
+_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len)
+{
+	struct page **pgto;
+	char *vto;
+	size_t copy;
+
+	pgto = pages + (pgbase >> PAGE_CACHE_SHIFT);
+	pgbase &= ~PAGE_CACHE_MASK;
+
+	for (;;) {
+		copy = PAGE_CACHE_SIZE - pgbase;
+		if (copy > len)
+			copy = len;
+
+		vto = kmap_atomic(*pgto);
+		memcpy(vto + pgbase, p, copy);
+		kunmap_atomic(vto);
+
+		len -= copy;
+		if (len == 0)
+			break;
+
+		pgbase += copy;
+		if (pgbase == PAGE_CACHE_SIZE) {
+			flush_dcache_page(*pgto);
+			pgbase = 0;
+			pgto++;
+		}
+		p += copy;
+	}
+	flush_dcache_page(*pgto);
+}
+
+/**
+ * _copy_from_pages
+ * @p: pointer to destination
+ * @pages: array of pages
+ * @pgbase: offset of source data
+ * @len: length
+ *
+ * Copies data into an arbitrary memory location from an array of pages
+ * The copy is assumed to be non-overlapping.
+ */
+void
+_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len)
+{
+	struct page **pgfrom;
+	char *vfrom;
+	size_t copy;
+
+	pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT);
+	pgbase &= ~PAGE_CACHE_MASK;
+
+	do {
+		copy = PAGE_CACHE_SIZE - pgbase;
+		if (copy > len)
+			copy = len;
+
+		vfrom = kmap_atomic(*pgfrom);
+		memcpy(p, vfrom + pgbase, copy);
+		kunmap_atomic(vfrom);
+
+		pgbase += copy;
+		if (pgbase == PAGE_CACHE_SIZE) {
+			pgbase = 0;
+			pgfrom++;
+		}
+		p += copy;
+
+	} while ((len -= copy) != 0);
+}
+EXPORT_SYMBOL_GPL(_copy_from_pages);
+
+/**
+ * xdr_shrink_bufhead
+ * @buf: xdr_buf
+ * @len: bytes to remove from buf->head[0]
+ *
+ * Shrinks XDR buffer's header kvec buf->head[0] by
+ * 'len' bytes. The extra data is not lost, but is instead
+ * moved into the inlined pages and/or the tail.
+ */
+static void
+xdr_shrink_bufhead(struct xdr_buf *buf, size_t len)
+{
+	struct kvec *head, *tail;
+	size_t copy, offs;
+	unsigned int pglen = buf->page_len;
+
+	tail = buf->tail;
+	head = buf->head;
+
+	WARN_ON_ONCE(len > head->iov_len);
+	if (len > head->iov_len)
+		len = head->iov_len;
+
+	/* Shift the tail first */
+	if (tail->iov_len != 0) {
+		if (tail->iov_len > len) {
+			copy = tail->iov_len - len;
+			memmove((char *)tail->iov_base + len,
+					tail->iov_base, copy);
+		}
+		/* Copy from the inlined pages into the tail */
+		copy = len;
+		if (copy > pglen)
+			copy = pglen;
+		offs = len - copy;
+		if (offs >= tail->iov_len)
+			copy = 0;
+		else if (copy > tail->iov_len - offs)
+			copy = tail->iov_len - offs;
+		if (copy != 0)
+			_copy_from_pages((char *)tail->iov_base + offs,
+					buf->pages,
+					buf->page_base + pglen + offs - len,
+					copy);
+		/* Do we also need to copy data from the head into the tail ? */
+		if (len > pglen) {
+			offs = copy = len - pglen;
+			if (copy > tail->iov_len)
+				copy = tail->iov_len;
+			memcpy(tail->iov_base,
+					(char *)head->iov_base +
+					head->iov_len - offs,
+					copy);
+		}
+	}
+	/* Now handle pages */
+	if (pglen != 0) {
+		if (pglen > len)
+			_shift_data_right_pages(buf->pages,
+					buf->page_base + len,
+					buf->page_base,
+					pglen - len);
+		copy = len;
+		if (len > pglen)
+			copy = pglen;
+		_copy_to_pages(buf->pages, buf->page_base,
+				(char *)head->iov_base + head->iov_len - len,
+				copy);
+	}
+	head->iov_len -= len;
+	buf->buflen -= len;
+	/* Have we truncated the message? */
+	if (buf->len > buf->buflen)
+		buf->len = buf->buflen;
+}
+
+/**
+ * xdr_shrink_pagelen
+ * @buf: xdr_buf
+ * @len: bytes to remove from buf->pages
+ *
+ * Shrinks XDR buffer's page array buf->pages by
+ * 'len' bytes. The extra data is not lost, but is instead
+ * moved into the tail.
+ */
+static void
+xdr_shrink_pagelen(struct xdr_buf *buf, size_t len)
+{
+	struct kvec *tail;
+	size_t copy;
+	unsigned int pglen = buf->page_len;
+	unsigned int tailbuf_len;
+
+	tail = buf->tail;
+	BUG_ON (len > pglen);
+
+	tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
+
+	/* Shift the tail first */
+	if (tailbuf_len != 0) {
+		unsigned int free_space = tailbuf_len - tail->iov_len;
+
+		if (len < free_space)
+			free_space = len;
+		tail->iov_len += free_space;
+
+		copy = len;
+		if (tail->iov_len > len) {
+			char *p = (char *)tail->iov_base + len;
+			memmove(p, tail->iov_base, tail->iov_len - len);
+		} else
+			copy = tail->iov_len;
+		/* Copy from the inlined pages into the tail */
+		_copy_from_pages((char *)tail->iov_base,
+				buf->pages, buf->page_base + pglen - len,
+				copy);
+	}
+	buf->page_len -= len;
+	buf->buflen -= len;
+	/* Have we truncated the message? */
+	if (buf->len > buf->buflen)
+		buf->len = buf->buflen;
+}
+
+void
+xdr_shift_buf(struct xdr_buf *buf, size_t len)
+{
+	xdr_shrink_bufhead(buf, len);
+}
+EXPORT_SYMBOL_GPL(xdr_shift_buf);
+
+/**
+ * xdr_stream_pos - Return the current offset from the start of the xdr_stream
+ * @xdr: pointer to struct xdr_stream
+ */
+unsigned int xdr_stream_pos(const struct xdr_stream *xdr)
+{
+	return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_pos);
+
+/**
+ * xdr_init_encode - Initialize a struct xdr_stream for sending data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer in which to encode data
+ * @p: current pointer inside XDR buffer
+ *
+ * Note: at the moment the RPC client only passes the length of our
+ *	 scratch buffer in the xdr_buf's header kvec. Previously this
+ *	 meant we needed to call xdr_adjust_iovec() after encoding the
+ *	 data. With the new scheme, the xdr_stream manages the details
+ *	 of the buffer length, and takes care of adjusting the kvec
+ *	 length for us.
+ */
+void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
+{
+	struct kvec *iov = buf->head;
+	int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len;
+
+	xdr_set_scratch_buffer(xdr, NULL, 0);
+	BUG_ON(scratch_len < 0);
+	xdr->buf = buf;
+	xdr->iov = iov;
+	xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len);
+	xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len);
+	BUG_ON(iov->iov_len > scratch_len);
+
+	if (p != xdr->p && p != NULL) {
+		size_t len;
+
+		BUG_ON(p < xdr->p || p > xdr->end);
+		len = (char *)p - (char *)xdr->p;
+		xdr->p = p;
+		buf->len += len;
+		iov->iov_len += len;
+	}
+}
+EXPORT_SYMBOL_GPL(xdr_init_encode);
+
+/**
+ * xdr_commit_encode - Ensure all data is written to buffer
+ * @xdr: pointer to xdr_stream
+ *
+ * We handle encoding across page boundaries by giving the caller a
+ * temporary location to write to, then later copying the data into
+ * place; xdr_commit_encode does that copying.
+ *
+ * Normally the caller doesn't need to call this directly, as the
+ * following xdr_reserve_space will do it.  But an explicit call may be
+ * required at the end of encoding, or any other time when the xdr_buf
+ * data might be read.
+ */
+void xdr_commit_encode(struct xdr_stream *xdr)
+{
+	int shift = xdr->scratch.iov_len;
+	void *page;
+
+	if (shift == 0)
+		return;
+	page = page_address(*xdr->page_ptr);
+	memcpy(xdr->scratch.iov_base, page, shift);
+	memmove(page, page + shift, (void *)xdr->p - page);
+	xdr->scratch.iov_len = 0;
+}
+EXPORT_SYMBOL_GPL(xdr_commit_encode);
+
+static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
+		size_t nbytes)
+{
+	static __be32 *p;
+	int space_left;
+	int frag1bytes, frag2bytes;
+
+	if (nbytes > PAGE_SIZE)
+		return NULL; /* Bigger buffers require special handling */
+	if (xdr->buf->len + nbytes > xdr->buf->buflen)
+		return NULL; /* Sorry, we're totally out of space */
+	frag1bytes = (xdr->end - xdr->p) << 2;
+	frag2bytes = nbytes - frag1bytes;
+	if (xdr->iov)
+		xdr->iov->iov_len += frag1bytes;
+	else
+		xdr->buf->page_len += frag1bytes;
+	xdr->page_ptr++;
+	xdr->iov = NULL;
+	/*
+	 * If the last encode didn't end exactly on a page boundary, the
+	 * next one will straddle boundaries.  Encode into the next
+	 * page, then copy it back later in xdr_commit_encode.  We use
+	 * the "scratch" iov to track any temporarily unused fragment of
+	 * space at the end of the previous buffer:
+	 */
+	xdr->scratch.iov_base = xdr->p;
+	xdr->scratch.iov_len = frag1bytes;
+	p = page_address(*xdr->page_ptr);
+	/*
+	 * Note this is where the next encode will start after we've
+	 * shifted this one back:
+	 */
+	xdr->p = (void *)p + frag2bytes;
+	space_left = xdr->buf->buflen - xdr->buf->len;
+	xdr->end = (void *)p + min_t(int, space_left, PAGE_SIZE);
+	xdr->buf->page_len += frag2bytes;
+	xdr->buf->len += nbytes;
+	return p;
+}
+
+/**
+ * xdr_reserve_space - Reserve buffer space for sending
+ * @xdr: pointer to xdr_stream
+ * @nbytes: number of bytes to reserve
+ *
+ * Checks that we have enough buffer space to encode 'nbytes' more
+ * bytes of data. If so, update the total xdr_buf length, and
+ * adjust the length of the current kvec.
+ */
+__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes)
+{
+	__be32 *p = xdr->p;
+	__be32 *q;
+
+	xdr_commit_encode(xdr);
+	/* align nbytes on the next 32-bit boundary */
+	nbytes += 3;
+	nbytes &= ~3;
+	q = p + (nbytes >> 2);
+	if (unlikely(q > xdr->end || q < p))
+		return xdr_get_next_encode_buffer(xdr, nbytes);
+	xdr->p = q;
+	if (xdr->iov)
+		xdr->iov->iov_len += nbytes;
+	else
+		xdr->buf->page_len += nbytes;
+	xdr->buf->len += nbytes;
+	return p;
+}
+EXPORT_SYMBOL_GPL(xdr_reserve_space);
+
+/**
+ * xdr_truncate_encode - truncate an encode buffer
+ * @xdr: pointer to xdr_stream
+ * @len: new length of buffer
+ *
+ * Truncates the xdr stream, so that xdr->buf->len == len,
+ * and xdr->p points at offset len from the start of the buffer, and
+ * head, tail, and page lengths are adjusted to correspond.
+ *
+ * If this means moving xdr->p to a different buffer, we assume that
+ * that the end pointer should be set to the end of the current page,
+ * except in the case of the head buffer when we assume the head
+ * buffer's current length represents the end of the available buffer.
+ *
+ * This is *not* safe to use on a buffer that already has inlined page
+ * cache pages (as in a zero-copy server read reply), except for the
+ * simple case of truncating from one position in the tail to another.
+ *
+ */
+void xdr_truncate_encode(struct xdr_stream *xdr, size_t len)
+{
+	struct xdr_buf *buf = xdr->buf;
+	struct kvec *head = buf->head;
+	struct kvec *tail = buf->tail;
+	int fraglen;
+	int new;
+
+	if (len > buf->len) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+	xdr_commit_encode(xdr);
+
+	fraglen = min_t(int, buf->len - len, tail->iov_len);
+	tail->iov_len -= fraglen;
+	buf->len -= fraglen;
+	if (tail->iov_len) {
+		xdr->p = tail->iov_base + tail->iov_len;
+		WARN_ON_ONCE(!xdr->end);
+		WARN_ON_ONCE(!xdr->iov);
+		return;
+	}
+	WARN_ON_ONCE(fraglen);
+	fraglen = min_t(int, buf->len - len, buf->page_len);
+	buf->page_len -= fraglen;
+	buf->len -= fraglen;
+
+	new = buf->page_base + buf->page_len;
+
+	xdr->page_ptr = buf->pages + (new >> PAGE_SHIFT);
+
+	if (buf->page_len) {
+		xdr->p = page_address(*xdr->page_ptr);
+		xdr->end = (void *)xdr->p + PAGE_SIZE;
+		xdr->p = (void *)xdr->p + (new % PAGE_SIZE);
+		WARN_ON_ONCE(xdr->iov);
+		return;
+	}
+	if (fraglen) {
+		xdr->end = head->iov_base + head->iov_len;
+		xdr->page_ptr--;
+	}
+	/* (otherwise assume xdr->end is already set) */
+	head->iov_len = len;
+	buf->len = len;
+	xdr->p = head->iov_base + head->iov_len;
+	xdr->iov = buf->head;
+}
+EXPORT_SYMBOL(xdr_truncate_encode);
+
+/**
+ * xdr_restrict_buflen - decrease available buffer space
+ * @xdr: pointer to xdr_stream
+ * @newbuflen: new maximum number of bytes available
+ *
+ * Adjust our idea of how much space is available in the buffer.
+ * If we've already used too much space in the buffer, returns -1.
+ * If the available space is already smaller than newbuflen, returns 0
+ * and does nothing.  Otherwise, adjusts xdr->buf->buflen to newbuflen
+ * and ensures xdr->end is set at most offset newbuflen from the start
+ * of the buffer.
+ */
+int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen)
+{
+	struct xdr_buf *buf = xdr->buf;
+	int left_in_this_buf = (void *)xdr->end - (void *)xdr->p;
+	int end_offset = buf->len + left_in_this_buf;
+
+	if (newbuflen < 0 || newbuflen < buf->len)
+		return -1;
+	if (newbuflen > buf->buflen)
+		return 0;
+	if (newbuflen < end_offset)
+		xdr->end = (void *)xdr->end + newbuflen - end_offset;
+	buf->buflen = newbuflen;
+	return 0;
+}
+EXPORT_SYMBOL(xdr_restrict_buflen);
+
+/**
+ * xdr_write_pages - Insert a list of pages into an XDR buffer for sending
+ * @xdr: pointer to xdr_stream
+ * @pages: list of pages
+ * @base: offset of first byte
+ * @len: length of data in bytes
+ *
+ */
+void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base,
+		 unsigned int len)
+{
+	struct xdr_buf *buf = xdr->buf;
+	struct kvec *iov = buf->tail;
+	buf->pages = pages;
+	buf->page_base = base;
+	buf->page_len = len;
+
+	iov->iov_base = (char *)xdr->p;
+	iov->iov_len  = 0;
+	xdr->iov = iov;
+
+	if (len & 3) {
+		unsigned int pad = 4 - (len & 3);
+
+		BUG_ON(xdr->p >= xdr->end);
+		iov->iov_base = (char *)xdr->p + (len & 3);
+		iov->iov_len  += pad;
+		len += pad;
+		*xdr->p++ = 0;
+	}
+	buf->buflen += len;
+	buf->len += len;
+}
+EXPORT_SYMBOL_GPL(xdr_write_pages);
+
+static void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov,
+		unsigned int len)
+{
+	if (len > iov->iov_len)
+		len = iov->iov_len;
+	xdr->p = (__be32*)iov->iov_base;
+	xdr->end = (__be32*)(iov->iov_base + len);
+	xdr->iov = iov;
+	xdr->page_ptr = NULL;
+}
+
+static int xdr_set_page_base(struct xdr_stream *xdr,
+		unsigned int base, unsigned int len)
+{
+	unsigned int pgnr;
+	unsigned int maxlen;
+	unsigned int pgoff;
+	unsigned int pgend;
+	void *kaddr;
+
+	maxlen = xdr->buf->page_len;
+	if (base >= maxlen)
+		return -EINVAL;
+	maxlen -= base;
+	if (len > maxlen)
+		len = maxlen;
+
+	base += xdr->buf->page_base;
+
+	pgnr = base >> PAGE_SHIFT;
+	xdr->page_ptr = &xdr->buf->pages[pgnr];
+	kaddr = page_address(*xdr->page_ptr);
+
+	pgoff = base & ~PAGE_MASK;
+	xdr->p = (__be32*)(kaddr + pgoff);
+
+	pgend = pgoff + len;
+	if (pgend > PAGE_SIZE)
+		pgend = PAGE_SIZE;
+	xdr->end = (__be32*)(kaddr + pgend);
+	xdr->iov = NULL;
+	return 0;
+}
+
+static void xdr_set_next_page(struct xdr_stream *xdr)
+{
+	unsigned int newbase;
+
+	newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT;
+	newbase -= xdr->buf->page_base;
+
+	if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0)
+		xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len);
+}
+
+static bool xdr_set_next_buffer(struct xdr_stream *xdr)
+{
+	if (xdr->page_ptr != NULL)
+		xdr_set_next_page(xdr);
+	else if (xdr->iov == xdr->buf->head) {
+		if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0)
+			xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len);
+	}
+	return xdr->p != xdr->end;
+}
+
+/**
+ * xdr_init_decode - Initialize an xdr_stream for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer from which to decode data
+ * @p: current pointer inside XDR buffer
+ */
+void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
+{
+	xdr->buf = buf;
+	xdr->scratch.iov_base = NULL;
+	xdr->scratch.iov_len = 0;
+	xdr->nwords = XDR_QUADLEN(buf->len);
+	if (buf->head[0].iov_len != 0)
+		xdr_set_iov(xdr, buf->head, buf->len);
+	else if (buf->page_len != 0)
+		xdr_set_page_base(xdr, 0, buf->len);
+	if (p != NULL && p > xdr->p && xdr->end >= p) {
+		xdr->nwords -= p - xdr->p;
+		xdr->p = p;
+	}
+}
+EXPORT_SYMBOL_GPL(xdr_init_decode);
+
+/**
+ * xdr_init_decode - Initialize an xdr_stream for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer from which to decode data
+ * @pages: list of pages to decode into
+ * @len: length in bytes of buffer in pages
+ */
+void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+			   struct page **pages, unsigned int len)
+{
+	memset(buf, 0, sizeof(*buf));
+	buf->pages =  pages;
+	buf->page_len =  len;
+	buf->buflen =  len;
+	buf->len = len;
+	xdr_init_decode(xdr, buf, NULL);
+}
+EXPORT_SYMBOL_GPL(xdr_init_decode_pages);
+
+static __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
+{
+	unsigned int nwords = XDR_QUADLEN(nbytes);
+	__be32 *p = xdr->p;
+	__be32 *q = p + nwords;
+
+	if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p))
+		return NULL;
+	xdr->p = q;
+	xdr->nwords -= nwords;
+	return p;
+}
+
+/**
+ * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to an empty buffer
+ * @buflen: size of 'buf'
+ *
+ * The scratch buffer is used when decoding from an array of pages.
+ * If an xdr_inline_decode() call spans across page boundaries, then
+ * we copy the data into the scratch buffer in order to allow linear
+ * access.
+ */
+void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen)
+{
+	xdr->scratch.iov_base = buf;
+	xdr->scratch.iov_len = buflen;
+}
+EXPORT_SYMBOL_GPL(xdr_set_scratch_buffer);
+
+static __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes)
+{
+	__be32 *p;
+	void *cpdest = xdr->scratch.iov_base;
+	size_t cplen = (char *)xdr->end - (char *)xdr->p;
+
+	if (nbytes > xdr->scratch.iov_len)
+		return NULL;
+	memcpy(cpdest, xdr->p, cplen);
+	cpdest += cplen;
+	nbytes -= cplen;
+	if (!xdr_set_next_buffer(xdr))
+		return NULL;
+	p = __xdr_inline_decode(xdr, nbytes);
+	if (p == NULL)
+		return NULL;
+	memcpy(cpdest, p, nbytes);
+	return xdr->scratch.iov_base;
+}
+
+/**
+ * xdr_inline_decode - Retrieve XDR data to decode
+ * @xdr: pointer to xdr_stream struct
+ * @nbytes: number of bytes of data to decode
+ *
+ * Check if the input buffer is long enough to enable us to decode
+ * 'nbytes' more bytes of data starting at the current position.
+ * If so return the current pointer, then update the current
+ * pointer position.
+ */
+__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
+{
+	__be32 *p;
+
+	if (nbytes == 0)
+		return xdr->p;
+	if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr))
+		return NULL;
+	p = __xdr_inline_decode(xdr, nbytes);
+	if (p != NULL)
+		return p;
+	return xdr_copy_to_scratch(xdr, nbytes);
+}
+EXPORT_SYMBOL_GPL(xdr_inline_decode);
+
+static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
+{
+	struct xdr_buf *buf = xdr->buf;
+	struct kvec *iov;
+	unsigned int nwords = XDR_QUADLEN(len);
+	unsigned int cur = xdr_stream_pos(xdr);
+
+	if (xdr->nwords == 0)
+		return 0;
+	/* Realign pages to current pointer position */
+	iov  = buf->head;
+	if (iov->iov_len > cur) {
+		xdr_shrink_bufhead(buf, iov->iov_len - cur);
+		xdr->nwords = XDR_QUADLEN(buf->len - cur);
+	}
+
+	if (nwords > xdr->nwords) {
+		nwords = xdr->nwords;
+		len = nwords << 2;
+	}
+	if (buf->page_len <= len)
+		len = buf->page_len;
+	else if (nwords < xdr->nwords) {
+		/* Truncate page data and move it into the tail */
+		xdr_shrink_pagelen(buf, buf->page_len - len);
+		xdr->nwords = XDR_QUADLEN(buf->len - cur);
+	}
+	return len;
+}
+
+/**
+ * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
+ * @xdr: pointer to xdr_stream struct
+ * @len: number of bytes of page data
+ *
+ * Moves data beyond the current pointer position from the XDR head[] buffer
+ * into the page list. Any data that lies beyond current position + "len"
+ * bytes is moved into the XDR tail[].
+ *
+ * Returns the number of XDR encoded bytes now contained in the pages
+ */
+unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
+{
+	struct xdr_buf *buf = xdr->buf;
+	struct kvec *iov;
+	unsigned int nwords;
+	unsigned int end;
+	unsigned int padding;
+
+	len = xdr_align_pages(xdr, len);
+	if (len == 0)
+		return 0;
+	nwords = XDR_QUADLEN(len);
+	padding = (nwords << 2) - len;
+	xdr->iov = iov = buf->tail;
+	/* Compute remaining message length.  */
+	end = ((xdr->nwords - nwords) << 2) + padding;
+	if (end > iov->iov_len)
+		end = iov->iov_len;
+
+	/*
+	 * Position current pointer at beginning of tail, and
+	 * set remaining message length.
+	 */
+	xdr->p = (__be32 *)((char *)iov->iov_base + padding);
+	xdr->end = (__be32 *)((char *)iov->iov_base + end);
+	xdr->page_ptr = NULL;
+	xdr->nwords = XDR_QUADLEN(end - padding);
+	return len;
+}
+EXPORT_SYMBOL_GPL(xdr_read_pages);
+
+/**
+ * xdr_enter_page - decode data from the XDR page
+ * @xdr: pointer to xdr_stream struct
+ * @len: number of bytes of page data
+ *
+ * Moves data beyond the current pointer position from the XDR head[] buffer
+ * into the page list. Any data that lies beyond current position + "len"
+ * bytes is moved into the XDR tail[]. The current pointer is then
+ * repositioned at the beginning of the first XDR page.
+ */
+void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
+{
+	len = xdr_align_pages(xdr, len);
+	/*
+	 * Position current pointer at beginning of tail, and
+	 * set remaining message length.
+	 */
+	if (len != 0)
+		xdr_set_page_base(xdr, 0, len);
+}
+EXPORT_SYMBOL_GPL(xdr_enter_page);
+
+static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
+
+void
+xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf)
+{
+	buf->head[0] = *iov;
+	buf->tail[0] = empty_iov;
+	buf->page_len = 0;
+	buf->buflen = buf->len = iov->iov_len;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_from_iov);
+
+/**
+ * xdr_buf_subsegment - set subbuf to a portion of buf
+ * @buf: an xdr buffer
+ * @subbuf: the result buffer
+ * @base: beginning of range in bytes
+ * @len: length of range in bytes
+ *
+ * sets @subbuf to an xdr buffer representing the portion of @buf of
+ * length @len starting at offset @base.
+ *
+ * @buf and @subbuf may be pointers to the same struct xdr_buf.
+ *
+ * Returns -1 if base of length are out of bounds.
+ */
+int
+xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf,
+			unsigned int base, unsigned int len)
+{
+	subbuf->buflen = subbuf->len = len;
+	if (base < buf->head[0].iov_len) {
+		subbuf->head[0].iov_base = buf->head[0].iov_base + base;
+		subbuf->head[0].iov_len = min_t(unsigned int, len,
+						buf->head[0].iov_len - base);
+		len -= subbuf->head[0].iov_len;
+		base = 0;
+	} else {
+		base -= buf->head[0].iov_len;
+		subbuf->head[0].iov_len = 0;
+	}
+
+	if (base < buf->page_len) {
+		subbuf->page_len = min(buf->page_len - base, len);
+		base += buf->page_base;
+		subbuf->page_base = base & ~PAGE_CACHE_MASK;
+		subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT];
+		len -= subbuf->page_len;
+		base = 0;
+	} else {
+		base -= buf->page_len;
+		subbuf->page_len = 0;
+	}
+
+	if (base < buf->tail[0].iov_len) {
+		subbuf->tail[0].iov_base = buf->tail[0].iov_base + base;
+		subbuf->tail[0].iov_len = min_t(unsigned int, len,
+						buf->tail[0].iov_len - base);
+		len -= subbuf->tail[0].iov_len;
+		base = 0;
+	} else {
+		base -= buf->tail[0].iov_len;
+		subbuf->tail[0].iov_len = 0;
+	}
+
+	if (base || len)
+		return -1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_subsegment);
+
+/**
+ * xdr_buf_trim - lop at most "len" bytes off the end of "buf"
+ * @buf: buf to be trimmed
+ * @len: number of bytes to reduce "buf" by
+ *
+ * Trim an xdr_buf by the given number of bytes by fixing up the lengths. Note
+ * that it's possible that we'll trim less than that amount if the xdr_buf is
+ * too small, or if (for instance) it's all in the head and the parser has
+ * already read too far into it.
+ */
+void xdr_buf_trim(struct xdr_buf *buf, unsigned int len)
+{
+	size_t cur;
+	unsigned int trim = len;
+
+	if (buf->tail[0].iov_len) {
+		cur = min_t(size_t, buf->tail[0].iov_len, trim);
+		buf->tail[0].iov_len -= cur;
+		trim -= cur;
+		if (!trim)
+			goto fix_len;
+	}
+
+	if (buf->page_len) {
+		cur = min_t(unsigned int, buf->page_len, trim);
+		buf->page_len -= cur;
+		trim -= cur;
+		if (!trim)
+			goto fix_len;
+	}
+
+	if (buf->head[0].iov_len) {
+		cur = min_t(size_t, buf->head[0].iov_len, trim);
+		buf->head[0].iov_len -= cur;
+		trim -= cur;
+	}
+fix_len:
+	buf->len -= (len - trim);
+}
+EXPORT_SYMBOL_GPL(xdr_buf_trim);
+
+static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+{
+	unsigned int this_len;
+
+	this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
+	memcpy(obj, subbuf->head[0].iov_base, this_len);
+	len -= this_len;
+	obj += this_len;
+	this_len = min_t(unsigned int, len, subbuf->page_len);
+	if (this_len)
+		_copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len);
+	len -= this_len;
+	obj += this_len;
+	this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
+	memcpy(obj, subbuf->tail[0].iov_base, this_len);
+}
+
+/* obj is assumed to point to allocated memory of size at least len: */
+int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
+{
+	struct xdr_buf subbuf;
+	int status;
+
+	status = xdr_buf_subsegment(buf, &subbuf, base, len);
+	if (status != 0)
+		return status;
+	__read_bytes_from_xdr_buf(&subbuf, obj, len);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf);
+
+static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+{
+	unsigned int this_len;
+
+	this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
+	memcpy(subbuf->head[0].iov_base, obj, this_len);
+	len -= this_len;
+	obj += this_len;
+	this_len = min_t(unsigned int, len, subbuf->page_len);
+	if (this_len)
+		_copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len);
+	len -= this_len;
+	obj += this_len;
+	this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
+	memcpy(subbuf->tail[0].iov_base, obj, this_len);
+}
+
+/* obj is assumed to point to allocated memory of size at least len: */
+int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
+{
+	struct xdr_buf subbuf;
+	int status;
+
+	status = xdr_buf_subsegment(buf, &subbuf, base, len);
+	if (status != 0)
+		return status;
+	__write_bytes_to_xdr_buf(&subbuf, obj, len);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf);
+
+int
+xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj)
+{
+	__be32	raw;
+	int	status;
+
+	status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
+	if (status)
+		return status;
+	*obj = be32_to_cpu(raw);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_decode_word);
+
+int
+xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj)
+{
+	__be32	raw = cpu_to_be32(obj);
+
+	return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj));
+}
+EXPORT_SYMBOL_GPL(xdr_encode_word);
+
+/* If the netobj starting offset bytes from the start of xdr_buf is contained
+ * entirely in the head or the tail, set object to point to it; otherwise
+ * try to find space for it at the end of the tail, copy it there, and
+ * set obj to point to it. */
+int xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset)
+{
+	struct xdr_buf subbuf;
+
+	if (xdr_decode_word(buf, offset, &obj->len))
+		return -EFAULT;
+	if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len))
+		return -EFAULT;
+
+	/* Is the obj contained entirely in the head? */
+	obj->data = subbuf.head[0].iov_base;
+	if (subbuf.head[0].iov_len == obj->len)
+		return 0;
+	/* ..or is the obj contained entirely in the tail? */
+	obj->data = subbuf.tail[0].iov_base;
+	if (subbuf.tail[0].iov_len == obj->len)
+		return 0;
+
+	/* use end of tail as storage for obj:
+	 * (We don't copy to the beginning because then we'd have
+	 * to worry about doing a potentially overlapping copy.
+	 * This assumes the object is at most half the length of the
+	 * tail.) */
+	if (obj->len > buf->buflen - buf->len)
+		return -ENOMEM;
+	if (buf->tail[0].iov_len != 0)
+		obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len;
+	else
+		obj->data = buf->head[0].iov_base + buf->head[0].iov_len;
+	__read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_read_netobj);
+
+/* Returns 0 on success, or else a negative error code. */
+static int
+xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
+		 struct xdr_array2_desc *desc, int encode)
+{
+	char *elem = NULL, *c;
+	unsigned int copied = 0, todo, avail_here;
+	struct page **ppages = NULL;
+	int err;
+
+	if (encode) {
+		if (xdr_encode_word(buf, base, desc->array_len) != 0)
+			return -EINVAL;
+	} else {
+		if (xdr_decode_word(buf, base, &desc->array_len) != 0 ||
+		    desc->array_len > desc->array_maxlen ||
+		    (unsigned long) base + 4 + desc->array_len *
+				    desc->elem_size > buf->len)
+			return -EINVAL;
+	}
+	base += 4;
+
+	if (!desc->xcode)
+		return 0;
+
+	todo = desc->array_len * desc->elem_size;
+
+	/* process head */
+	if (todo && base < buf->head->iov_len) {
+		c = buf->head->iov_base + base;
+		avail_here = min_t(unsigned int, todo,
+				   buf->head->iov_len - base);
+		todo -= avail_here;
+
+		while (avail_here >= desc->elem_size) {
+			err = desc->xcode(desc, c);
+			if (err)
+				goto out;
+			c += desc->elem_size;
+			avail_here -= desc->elem_size;
+		}
+		if (avail_here) {
+			if (!elem) {
+				elem = kmalloc(desc->elem_size, GFP_KERNEL);
+				err = -ENOMEM;
+				if (!elem)
+					goto out;
+			}
+			if (encode) {
+				err = desc->xcode(desc, elem);
+				if (err)
+					goto out;
+				memcpy(c, elem, avail_here);
+			} else
+				memcpy(elem, c, avail_here);
+			copied = avail_here;
+		}
+		base = buf->head->iov_len;  /* align to start of pages */
+	}
+
+	/* process pages array */
+	base -= buf->head->iov_len;
+	if (todo && base < buf->page_len) {
+		unsigned int avail_page;
+
+		avail_here = min(todo, buf->page_len - base);
+		todo -= avail_here;
+
+		base += buf->page_base;
+		ppages = buf->pages + (base >> PAGE_CACHE_SHIFT);
+		base &= ~PAGE_CACHE_MASK;
+		avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base,
+					avail_here);
+		c = kmap(*ppages) + base;
+
+		while (avail_here) {
+			avail_here -= avail_page;
+			if (copied || avail_page < desc->elem_size) {
+				unsigned int l = min(avail_page,
+					desc->elem_size - copied);
+				if (!elem) {
+					elem = kmalloc(desc->elem_size,
+						       GFP_KERNEL);
+					err = -ENOMEM;
+					if (!elem)
+						goto out;
+				}
+				if (encode) {
+					if (!copied) {
+						err = desc->xcode(desc, elem);
+						if (err)
+							goto out;
+					}
+					memcpy(c, elem + copied, l);
+					copied += l;
+					if (copied == desc->elem_size)
+						copied = 0;
+				} else {
+					memcpy(elem + copied, c, l);
+					copied += l;
+					if (copied == desc->elem_size) {
+						err = desc->xcode(desc, elem);
+						if (err)
+							goto out;
+						copied = 0;
+					}
+				}
+				avail_page -= l;
+				c += l;
+			}
+			while (avail_page >= desc->elem_size) {
+				err = desc->xcode(desc, c);
+				if (err)
+					goto out;
+				c += desc->elem_size;
+				avail_page -= desc->elem_size;
+			}
+			if (avail_page) {
+				unsigned int l = min(avail_page,
+					    desc->elem_size - copied);
+				if (!elem) {
+					elem = kmalloc(desc->elem_size,
+						       GFP_KERNEL);
+					err = -ENOMEM;
+					if (!elem)
+						goto out;
+				}
+				if (encode) {
+					if (!copied) {
+						err = desc->xcode(desc, elem);
+						if (err)
+							goto out;
+					}
+					memcpy(c, elem + copied, l);
+					copied += l;
+					if (copied == desc->elem_size)
+						copied = 0;
+				} else {
+					memcpy(elem + copied, c, l);
+					copied += l;
+					if (copied == desc->elem_size) {
+						err = desc->xcode(desc, elem);
+						if (err)
+							goto out;
+						copied = 0;
+					}
+				}
+			}
+			if (avail_here) {
+				kunmap(*ppages);
+				ppages++;
+				c = kmap(*ppages);
+			}
+
+			avail_page = min(avail_here,
+				 (unsigned int) PAGE_CACHE_SIZE);
+		}
+		base = buf->page_len;  /* align to start of tail */
+	}
+
+	/* process tail */
+	base -= buf->page_len;
+	if (todo) {
+		c = buf->tail->iov_base + base;
+		if (copied) {
+			unsigned int l = desc->elem_size - copied;
+
+			if (encode)
+				memcpy(c, elem + copied, l);
+			else {
+				memcpy(elem + copied, c, l);
+				err = desc->xcode(desc, elem);
+				if (err)
+					goto out;
+			}
+			todo -= l;
+			c += l;
+		}
+		while (todo) {
+			err = desc->xcode(desc, c);
+			if (err)
+				goto out;
+			c += desc->elem_size;
+			todo -= desc->elem_size;
+		}
+	}
+	err = 0;
+
+out:
+	kfree(elem);
+	if (ppages)
+		kunmap(*ppages);
+	return err;
+}
+
+int
+xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
+		  struct xdr_array2_desc *desc)
+{
+	if (base >= buf->len)
+		return -EINVAL;
+
+	return xdr_xcode_array2(buf, base, desc, 0);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_array2);
+
+int
+xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
+		  struct xdr_array2_desc *desc)
+{
+	if ((unsigned long) base + 4 + desc->array_len * desc->elem_size >
+	    buf->head->iov_len + buf->page_len + buf->tail->iov_len)
+		return -EINVAL;
+
+	return xdr_xcode_array2(buf, base, desc, 1);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_array2);
+
+int
+xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len,
+		int (*actor)(struct scatterlist *, void *), void *data)
+{
+	int i, ret = 0;
+	unsigned int page_len, thislen, page_offset;
+	struct scatterlist      sg[1];
+
+	sg_init_table(sg, 1);
+
+	if (offset >= buf->head[0].iov_len) {
+		offset -= buf->head[0].iov_len;
+	} else {
+		thislen = buf->head[0].iov_len - offset;
+		if (thislen > len)
+			thislen = len;
+		sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
+		ret = actor(sg, data);
+		if (ret)
+			goto out;
+		offset = 0;
+		len -= thislen;
+	}
+	if (len == 0)
+		goto out;
+
+	if (offset >= buf->page_len) {
+		offset -= buf->page_len;
+	} else {
+		page_len = buf->page_len - offset;
+		if (page_len > len)
+			page_len = len;
+		len -= page_len;
+		page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
+		i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
+		thislen = PAGE_CACHE_SIZE - page_offset;
+		do {
+			if (thislen > page_len)
+				thislen = page_len;
+			sg_set_page(sg, buf->pages[i], thislen, page_offset);
+			ret = actor(sg, data);
+			if (ret)
+				goto out;
+			page_len -= thislen;
+			i++;
+			page_offset = 0;
+			thislen = PAGE_CACHE_SIZE;
+		} while (page_len != 0);
+		offset = 0;
+	}
+	if (len == 0)
+		goto out;
+	if (offset < buf->tail[0].iov_len) {
+		thislen = buf->tail[0].iov_len - offset;
+		if (thislen > len)
+			thislen = len;
+		sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
+		ret = actor(sg, data);
+		len -= thislen;
+	}
+	if (len != 0)
+		ret = -EINVAL;
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(xdr_process_buf);
+
diff --git a/kernel/net/sunrpc/xprt.c b/kernel/net/sunrpc/xprt.c
new file mode 100644
index 000000000..1d4fe24af
--- /dev/null
+++ b/kernel/net/sunrpc/xprt.c
@@ -0,0 +1,1416 @@
+/*
+ *  linux/net/sunrpc/xprt.c
+ *
+ *  This is a generic RPC call interface supporting congestion avoidance,
+ *  and asynchronous calls.
+ *
+ *  The interface works like this:
+ *
+ *  -	When a process places a call, it allocates a request slot if
+ *	one is available. Otherwise, it sleeps on the backlog queue
+ *	(xprt_reserve).
+ *  -	Next, the caller puts together the RPC message, stuffs it into
+ *	the request struct, and calls xprt_transmit().
+ *  -	xprt_transmit sends the message and installs the caller on the
+ *	transport's wait list. At the same time, if a reply is expected,
+ *	it installs a timer that is run after the packet's timeout has
+ *	expired.
+ *  -	When a packet arrives, the data_ready handler walks the list of
+ *	pending requests for that transport. If a matching XID is found, the
+ *	caller is woken up, and the timer removed.
+ *  -	When no reply arrives within the timeout interval, the timer is
+ *	fired by the kernel and runs xprt_timer(). It either adjusts the
+ *	timeout values (minor timeout) or wakes up the caller with a status
+ *	of -ETIMEDOUT.
+ *  -	When the caller receives a notification from RPC that a reply arrived,
+ *	it should release the RPC slot, and process the reply.
+ *	If the call timed out, it may choose to retry the operation by
+ *	adjusting the initial timeout value, and simply calling rpc_call
+ *	again.
+ *
+ *  Support for async RPC is done through a set of RPC-specific scheduling
+ *  primitives that `transparently' work for processes as well as async
+ *  tasks that rely on callbacks.
+ *
+ *  Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
+ *
+ *  Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com>
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/net.h>
+#include <linux/ktime.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/bc_xprt.h>
+
+#include <trace/events/sunrpc.h>
+
+#include "sunrpc.h"
+
+/*
+ * Local variables
+ */
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_XPRT
+#endif
+
+/*
+ * Local functions
+ */
+static void	 xprt_init(struct rpc_xprt *xprt, struct net *net);
+static void	xprt_request_init(struct rpc_task *, struct rpc_xprt *);
+static void	xprt_connect_status(struct rpc_task *task);
+static int      __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
+static void	 xprt_destroy(struct rpc_xprt *xprt);
+
+static DEFINE_SPINLOCK(xprt_list_lock);
+static LIST_HEAD(xprt_list);
+
+/**
+ * xprt_register_transport - register a transport implementation
+ * @transport: transport to register
+ *
+ * If a transport implementation is loaded as a kernel module, it can
+ * call this interface to make itself known to the RPC client.
+ *
+ * Returns:
+ * 0:		transport successfully registered
+ * -EEXIST:	transport already registered
+ * -EINVAL:	transport module being unloaded
+ */
+int xprt_register_transport(struct xprt_class *transport)
+{
+	struct xprt_class *t;
+	int result;
+
+	result = -EEXIST;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		/* don't register the same transport class twice */
+		if (t->ident == transport->ident)
+			goto out;
+	}
+
+	list_add_tail(&transport->list, &xprt_list);
+	printk(KERN_INFO "RPC: Registered %s transport module.\n",
+	       transport->name);
+	result = 0;
+
+out:
+	spin_unlock(&xprt_list_lock);
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_register_transport);
+
+/**
+ * xprt_unregister_transport - unregister a transport implementation
+ * @transport: transport to unregister
+ *
+ * Returns:
+ * 0:		transport successfully unregistered
+ * -ENOENT:	transport never registered
+ */
+int xprt_unregister_transport(struct xprt_class *transport)
+{
+	struct xprt_class *t;
+	int result;
+
+	result = 0;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (t == transport) {
+			printk(KERN_INFO
+				"RPC: Unregistered %s transport module.\n",
+				transport->name);
+			list_del_init(&transport->list);
+			goto out;
+		}
+	}
+	result = -ENOENT;
+
+out:
+	spin_unlock(&xprt_list_lock);
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_unregister_transport);
+
+/**
+ * xprt_load_transport - load a transport implementation
+ * @transport_name: transport to load
+ *
+ * Returns:
+ * 0:		transport successfully loaded
+ * -ENOENT:	transport module not available
+ */
+int xprt_load_transport(const char *transport_name)
+{
+	struct xprt_class *t;
+	int result;
+
+	result = 0;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (strcmp(t->name, transport_name) == 0) {
+			spin_unlock(&xprt_list_lock);
+			goto out;
+		}
+	}
+	spin_unlock(&xprt_list_lock);
+	result = request_module("xprt%s", transport_name);
+out:
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_load_transport);
+
+/**
+ * xprt_reserve_xprt - serialize write access to transports
+ * @task: task that is requesting access to the transport
+ * @xprt: pointer to the target transport
+ *
+ * This prevents mixing the payload of separate requests, and prevents
+ * transport connects from colliding with writes.  No congestion control
+ * is provided.
+ */
+int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	int priority;
+
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
+		if (task == xprt->snd_task)
+			return 1;
+		goto out_sleep;
+	}
+	xprt->snd_task = task;
+	if (req != NULL)
+		req->rq_ntrans++;
+
+	return 1;
+
+out_sleep:
+	dprintk("RPC: %5u failed to lock transport %p\n",
+			task->tk_pid, xprt);
+	task->tk_timeout = 0;
+	task->tk_status = -EAGAIN;
+	if (req == NULL)
+		priority = RPC_PRIORITY_LOW;
+	else if (!req->rq_ntrans)
+		priority = RPC_PRIORITY_NORMAL;
+	else
+		priority = RPC_PRIORITY_HIGH;
+	rpc_sleep_on_priority(&xprt->sending, task, NULL, priority);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xprt_reserve_xprt);
+
+static void xprt_clear_locked(struct rpc_xprt *xprt)
+{
+	xprt->snd_task = NULL;
+	if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) {
+		smp_mb__before_atomic();
+		clear_bit(XPRT_LOCKED, &xprt->state);
+		smp_mb__after_atomic();
+	} else
+		queue_work(rpciod_workqueue, &xprt->task_cleanup);
+}
+
+/*
+ * xprt_reserve_xprt_cong - serialize write access to transports
+ * @task: task that is requesting access to the transport
+ *
+ * Same as xprt_reserve_xprt, but Van Jacobson congestion control is
+ * integrated into the decision of whether a request is allowed to be
+ * woken up and given access to the transport.
+ */
+int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	int priority;
+
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
+		if (task == xprt->snd_task)
+			return 1;
+		goto out_sleep;
+	}
+	if (req == NULL) {
+		xprt->snd_task = task;
+		return 1;
+	}
+	if (__xprt_get_cong(xprt, task)) {
+		xprt->snd_task = task;
+		req->rq_ntrans++;
+		return 1;
+	}
+	xprt_clear_locked(xprt);
+out_sleep:
+	dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt);
+	task->tk_timeout = 0;
+	task->tk_status = -EAGAIN;
+	if (req == NULL)
+		priority = RPC_PRIORITY_LOW;
+	else if (!req->rq_ntrans)
+		priority = RPC_PRIORITY_NORMAL;
+	else
+		priority = RPC_PRIORITY_HIGH;
+	rpc_sleep_on_priority(&xprt->sending, task, NULL, priority);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong);
+
+static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	int retval;
+
+	spin_lock_bh(&xprt->transport_lock);
+	retval = xprt->ops->reserve_xprt(xprt, task);
+	spin_unlock_bh(&xprt->transport_lock);
+	return retval;
+}
+
+static bool __xprt_lock_write_func(struct rpc_task *task, void *data)
+{
+	struct rpc_xprt *xprt = data;
+	struct rpc_rqst *req;
+
+	req = task->tk_rqstp;
+	xprt->snd_task = task;
+	if (req)
+		req->rq_ntrans++;
+	return true;
+}
+
+static void __xprt_lock_write_next(struct rpc_xprt *xprt)
+{
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
+		return;
+
+	if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt))
+		return;
+	xprt_clear_locked(xprt);
+}
+
+static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data)
+{
+	struct rpc_xprt *xprt = data;
+	struct rpc_rqst *req;
+
+	req = task->tk_rqstp;
+	if (req == NULL) {
+		xprt->snd_task = task;
+		return true;
+	}
+	if (__xprt_get_cong(xprt, task)) {
+		xprt->snd_task = task;
+		req->rq_ntrans++;
+		return true;
+	}
+	return false;
+}
+
+static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt)
+{
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
+		return;
+	if (RPCXPRT_CONGESTED(xprt))
+		goto out_unlock;
+	if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt))
+		return;
+out_unlock:
+	xprt_clear_locked(xprt);
+}
+
+static void xprt_task_clear_bytes_sent(struct rpc_task *task)
+{
+	if (task != NULL) {
+		struct rpc_rqst *req = task->tk_rqstp;
+		if (req != NULL)
+			req->rq_bytes_sent = 0;
+	}
+}
+
+/**
+ * xprt_release_xprt - allow other requests to use a transport
+ * @xprt: transport with other tasks potentially waiting
+ * @task: task that is releasing access to the transport
+ *
+ * Note that "task" can be NULL.  No congestion control is provided.
+ */
+void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	if (xprt->snd_task == task) {
+		xprt_task_clear_bytes_sent(task);
+		xprt_clear_locked(xprt);
+		__xprt_lock_write_next(xprt);
+	}
+}
+EXPORT_SYMBOL_GPL(xprt_release_xprt);
+
+/**
+ * xprt_release_xprt_cong - allow other requests to use a transport
+ * @xprt: transport with other tasks potentially waiting
+ * @task: task that is releasing access to the transport
+ *
+ * Note that "task" can be NULL.  Another task is awoken to use the
+ * transport if the transport's congestion window allows it.
+ */
+void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	if (xprt->snd_task == task) {
+		xprt_task_clear_bytes_sent(task);
+		xprt_clear_locked(xprt);
+		__xprt_lock_write_next_cong(xprt);
+	}
+}
+EXPORT_SYMBOL_GPL(xprt_release_xprt_cong);
+
+static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	spin_lock_bh(&xprt->transport_lock);
+	xprt->ops->release_xprt(xprt, task);
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/*
+ * Van Jacobson congestion avoidance. Check if the congestion window
+ * overflowed. Put the task to sleep if this is the case.
+ */
+static int
+__xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+
+	if (req->rq_cong)
+		return 1;
+	dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n",
+			task->tk_pid, xprt->cong, xprt->cwnd);
+	if (RPCXPRT_CONGESTED(xprt))
+		return 0;
+	req->rq_cong = 1;
+	xprt->cong += RPC_CWNDSCALE;
+	return 1;
+}
+
+/*
+ * Adjust the congestion window, and wake up the next task
+ * that has been sleeping due to congestion
+ */
+static void
+__xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req)
+{
+	if (!req->rq_cong)
+		return;
+	req->rq_cong = 0;
+	xprt->cong -= RPC_CWNDSCALE;
+	__xprt_lock_write_next_cong(xprt);
+}
+
+/**
+ * xprt_release_rqst_cong - housekeeping when request is complete
+ * @task: RPC request that recently completed
+ *
+ * Useful for transports that require congestion control.
+ */
+void xprt_release_rqst_cong(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+
+	__xprt_put_cong(req->rq_xprt, req);
+}
+EXPORT_SYMBOL_GPL(xprt_release_rqst_cong);
+
+/**
+ * xprt_adjust_cwnd - adjust transport congestion window
+ * @xprt: pointer to xprt
+ * @task: recently completed RPC request used to adjust window
+ * @result: result code of completed RPC request
+ *
+ * The transport code maintains an estimate on the maximum number of out-
+ * standing RPC requests, using a smoothed version of the congestion
+ * avoidance implemented in 44BSD. This is basically the Van Jacobson
+ * congestion algorithm: If a retransmit occurs, the congestion window is
+ * halved; otherwise, it is incremented by 1/cwnd when
+ *
+ *	-	a reply is received and
+ *	-	a full number of requests are outstanding and
+ *	-	the congestion window hasn't been updated recently.
+ */
+void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	unsigned long cwnd = xprt->cwnd;
+
+	if (result >= 0 && cwnd <= xprt->cong) {
+		/* The (cwnd >> 1) term makes sure
+		 * the result gets rounded properly. */
+		cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd;
+		if (cwnd > RPC_MAXCWND(xprt))
+			cwnd = RPC_MAXCWND(xprt);
+		__xprt_lock_write_next_cong(xprt);
+	} else if (result == -ETIMEDOUT) {
+		cwnd >>= 1;
+		if (cwnd < RPC_CWNDSCALE)
+			cwnd = RPC_CWNDSCALE;
+	}
+	dprintk("RPC:       cong %ld, cwnd was %ld, now %ld\n",
+			xprt->cong, xprt->cwnd, cwnd);
+	xprt->cwnd = cwnd;
+	__xprt_put_cong(xprt, req);
+}
+EXPORT_SYMBOL_GPL(xprt_adjust_cwnd);
+
+/**
+ * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue
+ * @xprt: transport with waiting tasks
+ * @status: result code to plant in each task before waking it
+ *
+ */
+void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status)
+{
+	if (status < 0)
+		rpc_wake_up_status(&xprt->pending, status);
+	else
+		rpc_wake_up(&xprt->pending);
+}
+EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks);
+
+/**
+ * xprt_wait_for_buffer_space - wait for transport output buffer to clear
+ * @task: task to be put to sleep
+ * @action: function pointer to be executed after wait
+ *
+ * Note that we only set the timer for the case of RPC_IS_SOFT(), since
+ * we don't in general want to force a socket disconnection due to
+ * an incomplete RPC call transmission.
+ */
+void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+
+	task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0;
+	rpc_sleep_on(&xprt->pending, task, action);
+}
+EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space);
+
+/**
+ * xprt_write_space - wake the task waiting for transport output buffer space
+ * @xprt: transport with waiting tasks
+ *
+ * Can be called in a soft IRQ context, so xprt_write_space never sleeps.
+ */
+void xprt_write_space(struct rpc_xprt *xprt)
+{
+	spin_lock_bh(&xprt->transport_lock);
+	if (xprt->snd_task) {
+		dprintk("RPC:       write space: waking waiting task on "
+				"xprt %p\n", xprt);
+		rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task);
+	}
+	spin_unlock_bh(&xprt->transport_lock);
+}
+EXPORT_SYMBOL_GPL(xprt_write_space);
+
+/**
+ * xprt_set_retrans_timeout_def - set a request's retransmit timeout
+ * @task: task whose timeout is to be set
+ *
+ * Set a request's retransmit timeout based on the transport's
+ * default timeout parameters.  Used by transports that don't adjust
+ * the retransmit timeout based on round-trip time estimation.
+ */
+void xprt_set_retrans_timeout_def(struct rpc_task *task)
+{
+	task->tk_timeout = task->tk_rqstp->rq_timeout;
+}
+EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def);
+
+/**
+ * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout
+ * @task: task whose timeout is to be set
+ *
+ * Set a request's retransmit timeout using the RTT estimator.
+ */
+void xprt_set_retrans_timeout_rtt(struct rpc_task *task)
+{
+	int timer = task->tk_msg.rpc_proc->p_timer;
+	struct rpc_clnt *clnt = task->tk_client;
+	struct rpc_rtt *rtt = clnt->cl_rtt;
+	struct rpc_rqst *req = task->tk_rqstp;
+	unsigned long max_timeout = clnt->cl_timeout->to_maxval;
+
+	task->tk_timeout = rpc_calc_rto(rtt, timer);
+	task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries;
+	if (task->tk_timeout > max_timeout || task->tk_timeout == 0)
+		task->tk_timeout = max_timeout;
+}
+EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt);
+
+static void xprt_reset_majortimeo(struct rpc_rqst *req)
+{
+	const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout;
+
+	req->rq_majortimeo = req->rq_timeout;
+	if (to->to_exponential)
+		req->rq_majortimeo <<= to->to_retries;
+	else
+		req->rq_majortimeo += to->to_increment * to->to_retries;
+	if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0)
+		req->rq_majortimeo = to->to_maxval;
+	req->rq_majortimeo += jiffies;
+}
+
+/**
+ * xprt_adjust_timeout - adjust timeout values for next retransmit
+ * @req: RPC request containing parameters to use for the adjustment
+ *
+ */
+int xprt_adjust_timeout(struct rpc_rqst *req)
+{
+	struct rpc_xprt *xprt = req->rq_xprt;
+	const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout;
+	int status = 0;
+
+	if (time_before(jiffies, req->rq_majortimeo)) {
+		if (to->to_exponential)
+			req->rq_timeout <<= 1;
+		else
+			req->rq_timeout += to->to_increment;
+		if (to->to_maxval && req->rq_timeout >= to->to_maxval)
+			req->rq_timeout = to->to_maxval;
+		req->rq_retries++;
+	} else {
+		req->rq_timeout = to->to_initval;
+		req->rq_retries = 0;
+		xprt_reset_majortimeo(req);
+		/* Reset the RTT counters == "slow start" */
+		spin_lock_bh(&xprt->transport_lock);
+		rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval);
+		spin_unlock_bh(&xprt->transport_lock);
+		status = -ETIMEDOUT;
+	}
+
+	if (req->rq_timeout == 0) {
+		printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n");
+		req->rq_timeout = 5 * HZ;
+	}
+	return status;
+}
+
+static void xprt_autoclose(struct work_struct *work)
+{
+	struct rpc_xprt *xprt =
+		container_of(work, struct rpc_xprt, task_cleanup);
+
+	xprt->ops->close(xprt);
+	clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+	xprt_release_write(xprt, NULL);
+}
+
+/**
+ * xprt_disconnect_done - mark a transport as disconnected
+ * @xprt: transport to flag for disconnect
+ *
+ */
+void xprt_disconnect_done(struct rpc_xprt *xprt)
+{
+	dprintk("RPC:       disconnected transport %p\n", xprt);
+	spin_lock_bh(&xprt->transport_lock);
+	xprt_clear_connected(xprt);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
+	spin_unlock_bh(&xprt->transport_lock);
+}
+EXPORT_SYMBOL_GPL(xprt_disconnect_done);
+
+/**
+ * xprt_force_disconnect - force a transport to disconnect
+ * @xprt: transport to disconnect
+ *
+ */
+void xprt_force_disconnect(struct rpc_xprt *xprt)
+{
+	/* Don't race with the test_bit() in xprt_clear_locked() */
+	spin_lock_bh(&xprt->transport_lock);
+	set_bit(XPRT_CLOSE_WAIT, &xprt->state);
+	/* Try to schedule an autoclose RPC call */
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
+		queue_work(rpciod_workqueue, &xprt->task_cleanup);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/**
+ * xprt_conditional_disconnect - force a transport to disconnect
+ * @xprt: transport to disconnect
+ * @cookie: 'connection cookie'
+ *
+ * This attempts to break the connection if and only if 'cookie' matches
+ * the current transport 'connection cookie'. It ensures that we don't
+ * try to break the connection more than once when we need to retransmit
+ * a batch of RPC requests.
+ *
+ */
+void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
+{
+	/* Don't race with the test_bit() in xprt_clear_locked() */
+	spin_lock_bh(&xprt->transport_lock);
+	if (cookie != xprt->connect_cookie)
+		goto out;
+	if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt))
+		goto out;
+	set_bit(XPRT_CLOSE_WAIT, &xprt->state);
+	/* Try to schedule an autoclose RPC call */
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
+		queue_work(rpciod_workqueue, &xprt->task_cleanup);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
+out:
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+static void
+xprt_init_autodisconnect(unsigned long data)
+{
+	struct rpc_xprt *xprt = (struct rpc_xprt *)data;
+
+	spin_lock(&xprt->transport_lock);
+	if (!list_empty(&xprt->recv))
+		goto out_abort;
+	if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
+		goto out_abort;
+	spin_unlock(&xprt->transport_lock);
+	queue_work(rpciod_workqueue, &xprt->task_cleanup);
+	return;
+out_abort:
+	spin_unlock(&xprt->transport_lock);
+}
+
+bool xprt_lock_connect(struct rpc_xprt *xprt,
+		struct rpc_task *task,
+		void *cookie)
+{
+	bool ret = false;
+
+	spin_lock_bh(&xprt->transport_lock);
+	if (!test_bit(XPRT_LOCKED, &xprt->state))
+		goto out;
+	if (xprt->snd_task != task)
+		goto out;
+	xprt_task_clear_bytes_sent(task);
+	xprt->snd_task = cookie;
+	ret = true;
+out:
+	spin_unlock_bh(&xprt->transport_lock);
+	return ret;
+}
+
+void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie)
+{
+	spin_lock_bh(&xprt->transport_lock);
+	if (xprt->snd_task != cookie)
+		goto out;
+	if (!test_bit(XPRT_LOCKED, &xprt->state))
+		goto out;
+	xprt->snd_task =NULL;
+	xprt->ops->release_xprt(xprt, NULL);
+out:
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/**
+ * xprt_connect - schedule a transport connect operation
+ * @task: RPC task that is requesting the connect
+ *
+ */
+void xprt_connect(struct rpc_task *task)
+{
+	struct rpc_xprt	*xprt = task->tk_rqstp->rq_xprt;
+
+	dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid,
+			xprt, (xprt_connected(xprt) ? "is" : "is not"));
+
+	if (!xprt_bound(xprt)) {
+		task->tk_status = -EAGAIN;
+		return;
+	}
+	if (!xprt_lock_write(xprt, task))
+		return;
+
+	if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state))
+		xprt->ops->close(xprt);
+
+	if (!xprt_connected(xprt)) {
+		task->tk_rqstp->rq_bytes_sent = 0;
+		task->tk_timeout = task->tk_rqstp->rq_timeout;
+		rpc_sleep_on(&xprt->pending, task, xprt_connect_status);
+
+		if (test_bit(XPRT_CLOSING, &xprt->state))
+			return;
+		if (xprt_test_and_set_connecting(xprt))
+			return;
+		xprt->stat.connect_start = jiffies;
+		xprt->ops->connect(xprt, task);
+	}
+	xprt_release_write(xprt, task);
+}
+
+static void xprt_connect_status(struct rpc_task *task)
+{
+	struct rpc_xprt	*xprt = task->tk_rqstp->rq_xprt;
+
+	if (task->tk_status == 0) {
+		xprt->stat.connect_count++;
+		xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start;
+		dprintk("RPC: %5u xprt_connect_status: connection established\n",
+				task->tk_pid);
+		return;
+	}
+
+	switch (task->tk_status) {
+	case -ECONNREFUSED:
+	case -ECONNRESET:
+	case -ECONNABORTED:
+	case -ENETUNREACH:
+	case -EHOSTUNREACH:
+	case -EPIPE:
+	case -EAGAIN:
+		dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid);
+		break;
+	case -ETIMEDOUT:
+		dprintk("RPC: %5u xprt_connect_status: connect attempt timed "
+				"out\n", task->tk_pid);
+		break;
+	default:
+		dprintk("RPC: %5u xprt_connect_status: error %d connecting to "
+				"server %s\n", task->tk_pid, -task->tk_status,
+				xprt->servername);
+		task->tk_status = -EIO;
+	}
+}
+
+/**
+ * xprt_lookup_rqst - find an RPC request corresponding to an XID
+ * @xprt: transport on which the original request was transmitted
+ * @xid: RPC XID of incoming reply
+ *
+ */
+struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid)
+{
+	struct rpc_rqst *entry;
+
+	list_for_each_entry(entry, &xprt->recv, rq_list)
+		if (entry->rq_xid == xid) {
+			trace_xprt_lookup_rqst(xprt, xid, 0);
+			return entry;
+		}
+
+	dprintk("RPC:       xprt_lookup_rqst did not find xid %08x\n",
+			ntohl(xid));
+	trace_xprt_lookup_rqst(xprt, xid, -ENOENT);
+	xprt->stat.bad_xids++;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(xprt_lookup_rqst);
+
+static void xprt_update_rtt(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_rtt *rtt = task->tk_client->cl_rtt;
+	unsigned int timer = task->tk_msg.rpc_proc->p_timer;
+	long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt));
+
+	if (timer) {
+		if (req->rq_ntrans == 1)
+			rpc_update_rtt(rtt, timer, m);
+		rpc_set_timeo(rtt, timer, req->rq_ntrans - 1);
+	}
+}
+
+/**
+ * xprt_complete_rqst - called when reply processing is complete
+ * @task: RPC request that recently completed
+ * @copied: actual number of bytes received from the transport
+ *
+ * Caller holds transport lock.
+ */
+void xprt_complete_rqst(struct rpc_task *task, int copied)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+
+	dprintk("RPC: %5u xid %08x complete (%d bytes received)\n",
+			task->tk_pid, ntohl(req->rq_xid), copied);
+	trace_xprt_complete_rqst(xprt, req->rq_xid, copied);
+
+	xprt->stat.recvs++;
+	req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime);
+	if (xprt->ops->timer != NULL)
+		xprt_update_rtt(task);
+
+	list_del_init(&req->rq_list);
+	req->rq_private_buf.len = copied;
+	/* Ensure all writes are done before we update */
+	/* req->rq_reply_bytes_recvd */
+	smp_wmb();
+	req->rq_reply_bytes_recvd = copied;
+	rpc_wake_up_queued_task(&xprt->pending, task);
+}
+EXPORT_SYMBOL_GPL(xprt_complete_rqst);
+
+static void xprt_timer(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+
+	if (task->tk_status != -ETIMEDOUT)
+		return;
+	dprintk("RPC: %5u xprt_timer\n", task->tk_pid);
+
+	spin_lock_bh(&xprt->transport_lock);
+	if (!req->rq_reply_bytes_recvd) {
+		if (xprt->ops->timer)
+			xprt->ops->timer(xprt, task);
+	} else
+		task->tk_status = 0;
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+static inline int xprt_has_timer(struct rpc_xprt *xprt)
+{
+	return xprt->idle_timeout != 0;
+}
+
+/**
+ * xprt_prepare_transmit - reserve the transport before sending a request
+ * @task: RPC task about to send a request
+ *
+ */
+bool xprt_prepare_transmit(struct rpc_task *task)
+{
+	struct rpc_rqst	*req = task->tk_rqstp;
+	struct rpc_xprt	*xprt = req->rq_xprt;
+	bool ret = false;
+
+	dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid);
+
+	spin_lock_bh(&xprt->transport_lock);
+	if (!req->rq_bytes_sent) {
+		if (req->rq_reply_bytes_recvd) {
+			task->tk_status = req->rq_reply_bytes_recvd;
+			goto out_unlock;
+		}
+		if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT)
+		    && xprt_connected(xprt)
+		    && req->rq_connect_cookie == xprt->connect_cookie) {
+			xprt->ops->set_retrans_timeout(task);
+			rpc_sleep_on(&xprt->pending, task, xprt_timer);
+			goto out_unlock;
+		}
+	}
+	if (!xprt->ops->reserve_xprt(xprt, task)) {
+		task->tk_status = -EAGAIN;
+		goto out_unlock;
+	}
+	ret = true;
+out_unlock:
+	spin_unlock_bh(&xprt->transport_lock);
+	return ret;
+}
+
+void xprt_end_transmit(struct rpc_task *task)
+{
+	xprt_release_write(task->tk_rqstp->rq_xprt, task);
+}
+
+/**
+ * xprt_transmit - send an RPC request on a transport
+ * @task: controlling RPC task
+ *
+ * We have to copy the iovec because sendmsg fiddles with its contents.
+ */
+void xprt_transmit(struct rpc_task *task)
+{
+	struct rpc_rqst	*req = task->tk_rqstp;
+	struct rpc_xprt	*xprt = req->rq_xprt;
+	int status, numreqs;
+
+	dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
+
+	if (!req->rq_reply_bytes_recvd) {
+		if (list_empty(&req->rq_list) && rpc_reply_expected(task)) {
+			/*
+			 * Add to the list only if we're expecting a reply
+			 */
+			spin_lock_bh(&xprt->transport_lock);
+			/* Update the softirq receive buffer */
+			memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
+					sizeof(req->rq_private_buf));
+			/* Add request to the receive list */
+			list_add_tail(&req->rq_list, &xprt->recv);
+			spin_unlock_bh(&xprt->transport_lock);
+			xprt_reset_majortimeo(req);
+			/* Turn off autodisconnect */
+			del_singleshot_timer_sync(&xprt->timer);
+		}
+	} else if (!req->rq_bytes_sent)
+		return;
+
+	req->rq_xtime = ktime_get();
+	status = xprt->ops->send_request(task);
+	trace_xprt_transmit(xprt, req->rq_xid, status);
+	if (status != 0) {
+		task->tk_status = status;
+		return;
+	}
+
+	dprintk("RPC: %5u xmit complete\n", task->tk_pid);
+	task->tk_flags |= RPC_TASK_SENT;
+	spin_lock_bh(&xprt->transport_lock);
+
+	xprt->ops->set_retrans_timeout(task);
+
+	numreqs = atomic_read(&xprt->num_reqs);
+	if (numreqs > xprt->stat.max_slots)
+		xprt->stat.max_slots = numreqs;
+	xprt->stat.sends++;
+	xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
+	xprt->stat.bklog_u += xprt->backlog.qlen;
+	xprt->stat.sending_u += xprt->sending.qlen;
+	xprt->stat.pending_u += xprt->pending.qlen;
+
+	/* Don't race with disconnect */
+	if (!xprt_connected(xprt))
+		task->tk_status = -ENOTCONN;
+	else {
+		/*
+		 * Sleep on the pending queue since
+		 * we're expecting a reply.
+		 */
+		if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task))
+			rpc_sleep_on(&xprt->pending, task, xprt_timer);
+		req->rq_connect_cookie = xprt->connect_cookie;
+	}
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	set_bit(XPRT_CONGESTED, &xprt->state);
+	rpc_sleep_on(&xprt->backlog, task, NULL);
+}
+
+static void xprt_wake_up_backlog(struct rpc_xprt *xprt)
+{
+	if (rpc_wake_up_next(&xprt->backlog) == NULL)
+		clear_bit(XPRT_CONGESTED, &xprt->state);
+}
+
+static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	bool ret = false;
+
+	if (!test_bit(XPRT_CONGESTED, &xprt->state))
+		goto out;
+	spin_lock(&xprt->reserve_lock);
+	if (test_bit(XPRT_CONGESTED, &xprt->state)) {
+		rpc_sleep_on(&xprt->backlog, task, NULL);
+		ret = true;
+	}
+	spin_unlock(&xprt->reserve_lock);
+out:
+	return ret;
+}
+
+static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags)
+{
+	struct rpc_rqst *req = ERR_PTR(-EAGAIN);
+
+	if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs))
+		goto out;
+	req = kzalloc(sizeof(struct rpc_rqst), gfp_flags);
+	if (req != NULL)
+		goto out;
+	atomic_dec(&xprt->num_reqs);
+	req = ERR_PTR(-ENOMEM);
+out:
+	return req;
+}
+
+static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
+{
+	if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) {
+		kfree(req);
+		return true;
+	}
+	return false;
+}
+
+void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req;
+
+	spin_lock(&xprt->reserve_lock);
+	if (!list_empty(&xprt->free)) {
+		req = list_entry(xprt->free.next, struct rpc_rqst, rq_list);
+		list_del(&req->rq_list);
+		goto out_init_req;
+	}
+	req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN);
+	if (!IS_ERR(req))
+		goto out_init_req;
+	switch (PTR_ERR(req)) {
+	case -ENOMEM:
+		dprintk("RPC:       dynamic allocation of request slot "
+				"failed! Retrying\n");
+		task->tk_status = -ENOMEM;
+		break;
+	case -EAGAIN:
+		xprt_add_backlog(xprt, task);
+		dprintk("RPC:       waiting for request slot\n");
+	default:
+		task->tk_status = -EAGAIN;
+	}
+	spin_unlock(&xprt->reserve_lock);
+	return;
+out_init_req:
+	task->tk_status = 0;
+	task->tk_rqstp = req;
+	xprt_request_init(task, xprt);
+	spin_unlock(&xprt->reserve_lock);
+}
+EXPORT_SYMBOL_GPL(xprt_alloc_slot);
+
+void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	/* Note: grabbing the xprt_lock_write() ensures that we throttle
+	 * new slot allocation if the transport is congested (i.e. when
+	 * reconnecting a stream transport or when out of socket write
+	 * buffer space).
+	 */
+	if (xprt_lock_write(xprt, task)) {
+		xprt_alloc_slot(xprt, task);
+		xprt_release_write(xprt, task);
+	}
+}
+EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot);
+
+static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
+{
+	spin_lock(&xprt->reserve_lock);
+	if (!xprt_dynamic_free_slot(xprt, req)) {
+		memset(req, 0, sizeof(*req));	/* mark unused */
+		list_add(&req->rq_list, &xprt->free);
+	}
+	xprt_wake_up_backlog(xprt);
+	spin_unlock(&xprt->reserve_lock);
+}
+
+static void xprt_free_all_slots(struct rpc_xprt *xprt)
+{
+	struct rpc_rqst *req;
+	while (!list_empty(&xprt->free)) {
+		req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list);
+		list_del(&req->rq_list);
+		kfree(req);
+	}
+}
+
+struct rpc_xprt *xprt_alloc(struct net *net, size_t size,
+		unsigned int num_prealloc,
+		unsigned int max_alloc)
+{
+	struct rpc_xprt *xprt;
+	struct rpc_rqst *req;
+	int i;
+
+	xprt = kzalloc(size, GFP_KERNEL);
+	if (xprt == NULL)
+		goto out;
+
+	xprt_init(xprt, net);
+
+	for (i = 0; i < num_prealloc; i++) {
+		req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL);
+		if (!req)
+			goto out_free;
+		list_add(&req->rq_list, &xprt->free);
+	}
+	if (max_alloc > num_prealloc)
+		xprt->max_reqs = max_alloc;
+	else
+		xprt->max_reqs = num_prealloc;
+	xprt->min_reqs = num_prealloc;
+	atomic_set(&xprt->num_reqs, num_prealloc);
+
+	return xprt;
+
+out_free:
+	xprt_free(xprt);
+out:
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(xprt_alloc);
+
+void xprt_free(struct rpc_xprt *xprt)
+{
+	put_net(xprt->xprt_net);
+	xprt_free_all_slots(xprt);
+	kfree(xprt);
+}
+EXPORT_SYMBOL_GPL(xprt_free);
+
+/**
+ * xprt_reserve - allocate an RPC request slot
+ * @task: RPC task requesting a slot allocation
+ *
+ * If the transport is marked as being congested, or if no more
+ * slots are available, place the task on the transport's
+ * backlog queue.
+ */
+void xprt_reserve(struct rpc_task *task)
+{
+	struct rpc_xprt	*xprt;
+
+	task->tk_status = 0;
+	if (task->tk_rqstp != NULL)
+		return;
+
+	task->tk_timeout = 0;
+	task->tk_status = -EAGAIN;
+	rcu_read_lock();
+	xprt = rcu_dereference(task->tk_client->cl_xprt);
+	if (!xprt_throttle_congested(xprt, task))
+		xprt->ops->alloc_slot(xprt, task);
+	rcu_read_unlock();
+}
+
+/**
+ * xprt_retry_reserve - allocate an RPC request slot
+ * @task: RPC task requesting a slot allocation
+ *
+ * If no more slots are available, place the task on the transport's
+ * backlog queue.
+ * Note that the only difference with xprt_reserve is that we now
+ * ignore the value of the XPRT_CONGESTED flag.
+ */
+void xprt_retry_reserve(struct rpc_task *task)
+{
+	struct rpc_xprt	*xprt;
+
+	task->tk_status = 0;
+	if (task->tk_rqstp != NULL)
+		return;
+
+	task->tk_timeout = 0;
+	task->tk_status = -EAGAIN;
+	rcu_read_lock();
+	xprt = rcu_dereference(task->tk_client->cl_xprt);
+	xprt->ops->alloc_slot(xprt, task);
+	rcu_read_unlock();
+}
+
+static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt)
+{
+	return (__force __be32)xprt->xid++;
+}
+
+static inline void xprt_init_xid(struct rpc_xprt *xprt)
+{
+	xprt->xid = prandom_u32();
+}
+
+static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
+{
+	struct rpc_rqst	*req = task->tk_rqstp;
+
+	INIT_LIST_HEAD(&req->rq_list);
+	req->rq_timeout = task->tk_client->cl_timeout->to_initval;
+	req->rq_task	= task;
+	req->rq_xprt    = xprt;
+	req->rq_buffer  = NULL;
+	req->rq_xid     = xprt_alloc_xid(xprt);
+	req->rq_connect_cookie = xprt->connect_cookie - 1;
+	req->rq_bytes_sent = 0;
+	req->rq_snd_buf.len = 0;
+	req->rq_snd_buf.buflen = 0;
+	req->rq_rcv_buf.len = 0;
+	req->rq_rcv_buf.buflen = 0;
+	req->rq_release_snd_buf = NULL;
+	xprt_reset_majortimeo(req);
+	dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid,
+			req, ntohl(req->rq_xid));
+}
+
+/**
+ * xprt_release - release an RPC request slot
+ * @task: task which is finished with the slot
+ *
+ */
+void xprt_release(struct rpc_task *task)
+{
+	struct rpc_xprt	*xprt;
+	struct rpc_rqst	*req = task->tk_rqstp;
+
+	if (req == NULL) {
+		if (task->tk_client) {
+			rcu_read_lock();
+			xprt = rcu_dereference(task->tk_client->cl_xprt);
+			if (xprt->snd_task == task)
+				xprt_release_write(xprt, task);
+			rcu_read_unlock();
+		}
+		return;
+	}
+
+	xprt = req->rq_xprt;
+	if (task->tk_ops->rpc_count_stats != NULL)
+		task->tk_ops->rpc_count_stats(task, task->tk_calldata);
+	else if (task->tk_client)
+		rpc_count_iostats(task, task->tk_client->cl_metrics);
+	spin_lock_bh(&xprt->transport_lock);
+	xprt->ops->release_xprt(xprt, task);
+	if (xprt->ops->release_request)
+		xprt->ops->release_request(task);
+	if (!list_empty(&req->rq_list))
+		list_del(&req->rq_list);
+	xprt->last_used = jiffies;
+	if (list_empty(&xprt->recv) && xprt_has_timer(xprt))
+		mod_timer(&xprt->timer,
+				xprt->last_used + xprt->idle_timeout);
+	spin_unlock_bh(&xprt->transport_lock);
+	if (req->rq_buffer)
+		xprt->ops->buf_free(req->rq_buffer);
+	if (req->rq_cred != NULL)
+		put_rpccred(req->rq_cred);
+	task->tk_rqstp = NULL;
+	if (req->rq_release_snd_buf)
+		req->rq_release_snd_buf(req);
+
+	dprintk("RPC: %5u release request %p\n", task->tk_pid, req);
+	if (likely(!bc_prealloc(req)))
+		xprt_free_slot(xprt, req);
+	else
+		xprt_free_bc_request(req);
+}
+
+static void xprt_init(struct rpc_xprt *xprt, struct net *net)
+{
+	atomic_set(&xprt->count, 1);
+
+	spin_lock_init(&xprt->transport_lock);
+	spin_lock_init(&xprt->reserve_lock);
+
+	INIT_LIST_HEAD(&xprt->free);
+	INIT_LIST_HEAD(&xprt->recv);
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	spin_lock_init(&xprt->bc_pa_lock);
+	INIT_LIST_HEAD(&xprt->bc_pa_list);
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+	xprt->last_used = jiffies;
+	xprt->cwnd = RPC_INITCWND;
+	xprt->bind_index = 0;
+
+	rpc_init_wait_queue(&xprt->binding, "xprt_binding");
+	rpc_init_wait_queue(&xprt->pending, "xprt_pending");
+	rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending");
+	rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog");
+
+	xprt_init_xid(xprt);
+
+	xprt->xprt_net = get_net(net);
+}
+
+/**
+ * xprt_create_transport - create an RPC transport
+ * @args: rpc transport creation arguments
+ *
+ */
+struct rpc_xprt *xprt_create_transport(struct xprt_create *args)
+{
+	struct rpc_xprt	*xprt;
+	struct xprt_class *t;
+
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (t->ident == args->ident) {
+			spin_unlock(&xprt_list_lock);
+			goto found;
+		}
+	}
+	spin_unlock(&xprt_list_lock);
+	dprintk("RPC: transport (%d) not supported\n", args->ident);
+	return ERR_PTR(-EIO);
+
+found:
+	xprt = t->setup(args);
+	if (IS_ERR(xprt)) {
+		dprintk("RPC:       xprt_create_transport: failed, %ld\n",
+				-PTR_ERR(xprt));
+		goto out;
+	}
+	if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT)
+		xprt->idle_timeout = 0;
+	INIT_WORK(&xprt->task_cleanup, xprt_autoclose);
+	if (xprt_has_timer(xprt))
+		setup_timer(&xprt->timer, xprt_init_autodisconnect,
+			    (unsigned long)xprt);
+	else
+		init_timer(&xprt->timer);
+
+	if (strlen(args->servername) > RPC_MAXNETNAMELEN) {
+		xprt_destroy(xprt);
+		return ERR_PTR(-EINVAL);
+	}
+	xprt->servername = kstrdup(args->servername, GFP_KERNEL);
+	if (xprt->servername == NULL) {
+		xprt_destroy(xprt);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	rpc_xprt_debugfs_register(xprt);
+
+	dprintk("RPC:       created transport %p with %u slots\n", xprt,
+			xprt->max_reqs);
+out:
+	return xprt;
+}
+
+/**
+ * xprt_destroy - destroy an RPC transport, killing off all requests.
+ * @xprt: transport to destroy
+ *
+ */
+static void xprt_destroy(struct rpc_xprt *xprt)
+{
+	dprintk("RPC:       destroying transport %p\n", xprt);
+	del_timer_sync(&xprt->timer);
+
+	rpc_xprt_debugfs_unregister(xprt);
+	rpc_destroy_wait_queue(&xprt->binding);
+	rpc_destroy_wait_queue(&xprt->pending);
+	rpc_destroy_wait_queue(&xprt->sending);
+	rpc_destroy_wait_queue(&xprt->backlog);
+	cancel_work_sync(&xprt->task_cleanup);
+	kfree(xprt->servername);
+	/*
+	 * Tear down transport state and free the rpc_xprt
+	 */
+	xprt->ops->destroy(xprt);
+}
+
+/**
+ * xprt_put - release a reference to an RPC transport.
+ * @xprt: pointer to the transport
+ *
+ */
+void xprt_put(struct rpc_xprt *xprt)
+{
+	if (atomic_dec_and_test(&xprt->count))
+		xprt_destroy(xprt);
+}
diff --git a/kernel/net/sunrpc/xprtrdma/Makefile b/kernel/net/sunrpc/xprtrdma/Makefile
new file mode 100644
index 000000000..579f72bbc
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/Makefile
@@ -0,0 +1,9 @@
+obj-$(CONFIG_SUNRPC_XPRT_RDMA_CLIENT) += xprtrdma.o
+
+xprtrdma-y := transport.o rpc_rdma.o verbs.o \
+	fmr_ops.o frwr_ops.o physical_ops.o
+
+obj-$(CONFIG_SUNRPC_XPRT_RDMA_SERVER) += svcrdma.o
+
+svcrdma-y := svc_rdma.o svc_rdma_transport.o \
+	svc_rdma_marshal.o svc_rdma_sendto.o svc_rdma_recvfrom.o
diff --git a/kernel/net/sunrpc/xprtrdma/fmr_ops.c b/kernel/net/sunrpc/xprtrdma/fmr_ops.c
new file mode 100644
index 000000000..302d4ebf6
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/fmr_ops.c
@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2015 Oracle.  All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* Lightweight memory registration using Fast Memory Regions (FMR).
+ * Referred to sometimes as MTHCAFMR mode.
+ *
+ * FMR uses synchronous memory registration and deregistration.
+ * FMR registration is known to be fast, but FMR deregistration
+ * can take tens of usecs to complete.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+/* Maximum scatter/gather per FMR */
+#define RPCRDMA_MAX_FMR_SGES	(64)
+
+static int
+fmr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+	    struct rpcrdma_create_data_internal *cdata)
+{
+	return 0;
+}
+
+/* FMR mode conveys up to 64 pages of payload per chunk segment.
+ */
+static size_t
+fmr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+	return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+		     rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES);
+}
+
+static int
+fmr_op_init(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	int mr_access_flags = IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ;
+	struct ib_fmr_attr fmr_attr = {
+		.max_pages	= RPCRDMA_MAX_FMR_SGES,
+		.max_maps	= 1,
+		.page_shift	= PAGE_SHIFT
+	};
+	struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
+	struct rpcrdma_mw *r;
+	int i, rc;
+
+	INIT_LIST_HEAD(&buf->rb_mws);
+	INIT_LIST_HEAD(&buf->rb_all);
+
+	i = (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS;
+	dprintk("RPC:       %s: initializing %d FMRs\n", __func__, i);
+
+	while (i--) {
+		r = kzalloc(sizeof(*r), GFP_KERNEL);
+		if (!r)
+			return -ENOMEM;
+
+		r->r.fmr = ib_alloc_fmr(pd, mr_access_flags, &fmr_attr);
+		if (IS_ERR(r->r.fmr))
+			goto out_fmr_err;
+
+		list_add(&r->mw_list, &buf->rb_mws);
+		list_add(&r->mw_all, &buf->rb_all);
+	}
+	return 0;
+
+out_fmr_err:
+	rc = PTR_ERR(r->r.fmr);
+	dprintk("RPC:       %s: ib_alloc_fmr status %i\n", __func__, rc);
+	kfree(r);
+	return rc;
+}
+
+/* Use the ib_map_phys_fmr() verb to register a memory region
+ * for remote access via RDMA READ or RDMA WRITE.
+ */
+static int
+fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
+	   int nsegs, bool writing)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct ib_device *device = ia->ri_id->device;
+	enum dma_data_direction direction = rpcrdma_data_dir(writing);
+	struct rpcrdma_mr_seg *seg1 = seg;
+	struct rpcrdma_mw *mw = seg1->rl_mw;
+	u64 physaddrs[RPCRDMA_MAX_DATA_SEGS];
+	int len, pageoff, i, rc;
+
+	pageoff = offset_in_page(seg1->mr_offset);
+	seg1->mr_offset -= pageoff;	/* start of page */
+	seg1->mr_len += pageoff;
+	len = -pageoff;
+	if (nsegs > RPCRDMA_MAX_FMR_SGES)
+		nsegs = RPCRDMA_MAX_FMR_SGES;
+	for (i = 0; i < nsegs;) {
+		rpcrdma_map_one(device, seg, direction);
+		physaddrs[i] = seg->mr_dma;
+		len += seg->mr_len;
+		++seg;
+		++i;
+		/* Check for holes */
+		if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
+		    offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
+			break;
+	}
+
+	rc = ib_map_phys_fmr(mw->r.fmr, physaddrs, i, seg1->mr_dma);
+	if (rc)
+		goto out_maperr;
+
+	seg1->mr_rkey = mw->r.fmr->rkey;
+	seg1->mr_base = seg1->mr_dma + pageoff;
+	seg1->mr_nsegs = i;
+	seg1->mr_len = len;
+	return i;
+
+out_maperr:
+	dprintk("RPC:       %s: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n",
+		__func__, len, (unsigned long long)seg1->mr_dma,
+		pageoff, i, rc);
+	while (i--)
+		rpcrdma_unmap_one(device, --seg);
+	return rc;
+}
+
+/* Use the ib_unmap_fmr() verb to prevent further remote
+ * access via RDMA READ or RDMA WRITE.
+ */
+static int
+fmr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct rpcrdma_mr_seg *seg1 = seg;
+	struct ib_device *device;
+	int rc, nsegs = seg->mr_nsegs;
+	LIST_HEAD(l);
+
+	list_add(&seg1->rl_mw->r.fmr->list, &l);
+	rc = ib_unmap_fmr(&l);
+	read_lock(&ia->ri_qplock);
+	device = ia->ri_id->device;
+	while (seg1->mr_nsegs--)
+		rpcrdma_unmap_one(device, seg++);
+	read_unlock(&ia->ri_qplock);
+	if (rc)
+		goto out_err;
+	return nsegs;
+
+out_err:
+	dprintk("RPC:       %s: ib_unmap_fmr status %i\n", __func__, rc);
+	return nsegs;
+}
+
+/* After a disconnect, unmap all FMRs.
+ *
+ * This is invoked only in the transport connect worker in order
+ * to serialize with rpcrdma_register_fmr_external().
+ */
+static void
+fmr_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct rpcrdma_mw *r;
+	LIST_HEAD(list);
+	int rc;
+
+	list_for_each_entry(r, &buf->rb_all, mw_all)
+		list_add(&r->r.fmr->list, &list);
+
+	rc = ib_unmap_fmr(&list);
+	if (rc)
+		dprintk("RPC:       %s: ib_unmap_fmr failed %i\n",
+			__func__, rc);
+}
+
+static void
+fmr_op_destroy(struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_mw *r;
+	int rc;
+
+	while (!list_empty(&buf->rb_all)) {
+		r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);
+		list_del(&r->mw_all);
+		rc = ib_dealloc_fmr(r->r.fmr);
+		if (rc)
+			dprintk("RPC:       %s: ib_dealloc_fmr failed %i\n",
+				__func__, rc);
+		kfree(r);
+	}
+}
+
+const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
+	.ro_map				= fmr_op_map,
+	.ro_unmap			= fmr_op_unmap,
+	.ro_open			= fmr_op_open,
+	.ro_maxpages			= fmr_op_maxpages,
+	.ro_init			= fmr_op_init,
+	.ro_reset			= fmr_op_reset,
+	.ro_destroy			= fmr_op_destroy,
+	.ro_displayname			= "fmr",
+};
diff --git a/kernel/net/sunrpc/xprtrdma/frwr_ops.c b/kernel/net/sunrpc/xprtrdma/frwr_ops.c
new file mode 100644
index 000000000..dff0481db
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/frwr_ops.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright (c) 2015 Oracle.  All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* Lightweight memory registration using Fast Registration Work
+ * Requests (FRWR). Also referred to sometimes as FRMR mode.
+ *
+ * FRWR features ordered asynchronous registration and deregistration
+ * of arbitrarily sized memory regions. This is the fastest and safest
+ * but most complex memory registration mode.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+static int
+__frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
+	    unsigned int depth)
+{
+	struct rpcrdma_frmr *f = &r->r.frmr;
+	int rc;
+
+	f->fr_mr = ib_alloc_fast_reg_mr(pd, depth);
+	if (IS_ERR(f->fr_mr))
+		goto out_mr_err;
+	f->fr_pgl = ib_alloc_fast_reg_page_list(device, depth);
+	if (IS_ERR(f->fr_pgl))
+		goto out_list_err;
+	return 0;
+
+out_mr_err:
+	rc = PTR_ERR(f->fr_mr);
+	dprintk("RPC:       %s: ib_alloc_fast_reg_mr status %i\n",
+		__func__, rc);
+	return rc;
+
+out_list_err:
+	rc = PTR_ERR(f->fr_pgl);
+	dprintk("RPC:       %s: ib_alloc_fast_reg_page_list status %i\n",
+		__func__, rc);
+	ib_dereg_mr(f->fr_mr);
+	return rc;
+}
+
+static void
+__frwr_release(struct rpcrdma_mw *r)
+{
+	int rc;
+
+	rc = ib_dereg_mr(r->r.frmr.fr_mr);
+	if (rc)
+		dprintk("RPC:       %s: ib_dereg_mr status %i\n",
+			__func__, rc);
+	ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);
+}
+
+static int
+frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+	     struct rpcrdma_create_data_internal *cdata)
+{
+	struct ib_device_attr *devattr = &ia->ri_devattr;
+	int depth, delta;
+
+	ia->ri_max_frmr_depth =
+			min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+			      devattr->max_fast_reg_page_list_len);
+	dprintk("RPC:       %s: device's max FR page list len = %u\n",
+		__func__, ia->ri_max_frmr_depth);
+
+	/* Add room for frmr register and invalidate WRs.
+	 * 1. FRMR reg WR for head
+	 * 2. FRMR invalidate WR for head
+	 * 3. N FRMR reg WRs for pagelist
+	 * 4. N FRMR invalidate WRs for pagelist
+	 * 5. FRMR reg WR for tail
+	 * 6. FRMR invalidate WR for tail
+	 * 7. The RDMA_SEND WR
+	 */
+	depth = 7;
+
+	/* Calculate N if the device max FRMR depth is smaller than
+	 * RPCRDMA_MAX_DATA_SEGS.
+	 */
+	if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) {
+		delta = RPCRDMA_MAX_DATA_SEGS - ia->ri_max_frmr_depth;
+		do {
+			depth += 2; /* FRMR reg + invalidate */
+			delta -= ia->ri_max_frmr_depth;
+		} while (delta > 0);
+	}
+
+	ep->rep_attr.cap.max_send_wr *= depth;
+	if (ep->rep_attr.cap.max_send_wr > devattr->max_qp_wr) {
+		cdata->max_requests = devattr->max_qp_wr / depth;
+		if (!cdata->max_requests)
+			return -EINVAL;
+		ep->rep_attr.cap.max_send_wr = cdata->max_requests *
+					       depth;
+	}
+
+	return 0;
+}
+
+/* FRWR mode conveys a list of pages per chunk segment. The
+ * maximum length of that list is the FRWR page list depth.
+ */
+static size_t
+frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+	return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+		     rpcrdma_max_segments(r_xprt) * ia->ri_max_frmr_depth);
+}
+
+/* If FAST_REG or LOCAL_INV failed, indicate the frmr needs to be reset. */
+static void
+frwr_sendcompletion(struct ib_wc *wc)
+{
+	struct rpcrdma_mw *r;
+
+	if (likely(wc->status == IB_WC_SUCCESS))
+		return;
+
+	/* WARNING: Only wr_id and status are reliable at this point */
+	r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
+	dprintk("RPC:       %s: frmr %p (stale), status %d\n",
+		__func__, r, wc->status);
+	r->r.frmr.fr_state = FRMR_IS_STALE;
+}
+
+static int
+frwr_op_init(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct ib_device *device = r_xprt->rx_ia.ri_id->device;
+	unsigned int depth = r_xprt->rx_ia.ri_max_frmr_depth;
+	struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
+	int i;
+
+	INIT_LIST_HEAD(&buf->rb_mws);
+	INIT_LIST_HEAD(&buf->rb_all);
+
+	i = (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS;
+	dprintk("RPC:       %s: initializing %d FRMRs\n", __func__, i);
+
+	while (i--) {
+		struct rpcrdma_mw *r;
+		int rc;
+
+		r = kzalloc(sizeof(*r), GFP_KERNEL);
+		if (!r)
+			return -ENOMEM;
+
+		rc = __frwr_init(r, pd, device, depth);
+		if (rc) {
+			kfree(r);
+			return rc;
+		}
+
+		list_add(&r->mw_list, &buf->rb_mws);
+		list_add(&r->mw_all, &buf->rb_all);
+		r->mw_sendcompletion = frwr_sendcompletion;
+	}
+
+	return 0;
+}
+
+/* Post a FAST_REG Work Request to register a memory region
+ * for remote access via RDMA READ or RDMA WRITE.
+ */
+static int
+frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
+	    int nsegs, bool writing)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct ib_device *device = ia->ri_id->device;
+	enum dma_data_direction direction = rpcrdma_data_dir(writing);
+	struct rpcrdma_mr_seg *seg1 = seg;
+	struct rpcrdma_mw *mw = seg1->rl_mw;
+	struct rpcrdma_frmr *frmr = &mw->r.frmr;
+	struct ib_mr *mr = frmr->fr_mr;
+	struct ib_send_wr fastreg_wr, *bad_wr;
+	u8 key;
+	int len, pageoff;
+	int i, rc;
+	int seg_len;
+	u64 pa;
+	int page_no;
+
+	pageoff = offset_in_page(seg1->mr_offset);
+	seg1->mr_offset -= pageoff;	/* start of page */
+	seg1->mr_len += pageoff;
+	len = -pageoff;
+	if (nsegs > ia->ri_max_frmr_depth)
+		nsegs = ia->ri_max_frmr_depth;
+	for (page_no = i = 0; i < nsegs;) {
+		rpcrdma_map_one(device, seg, direction);
+		pa = seg->mr_dma;
+		for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) {
+			frmr->fr_pgl->page_list[page_no++] = pa;
+			pa += PAGE_SIZE;
+		}
+		len += seg->mr_len;
+		++seg;
+		++i;
+		/* Check for holes */
+		if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
+		    offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
+			break;
+	}
+	dprintk("RPC:       %s: Using frmr %p to map %d segments (%d bytes)\n",
+		__func__, mw, i, len);
+
+	frmr->fr_state = FRMR_IS_VALID;
+
+	memset(&fastreg_wr, 0, sizeof(fastreg_wr));
+	fastreg_wr.wr_id = (unsigned long)(void *)mw;
+	fastreg_wr.opcode = IB_WR_FAST_REG_MR;
+	fastreg_wr.wr.fast_reg.iova_start = seg1->mr_dma + pageoff;
+	fastreg_wr.wr.fast_reg.page_list = frmr->fr_pgl;
+	fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
+	fastreg_wr.wr.fast_reg.page_list_len = page_no;
+	fastreg_wr.wr.fast_reg.length = len;
+	fastreg_wr.wr.fast_reg.access_flags = writing ?
+				IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
+				IB_ACCESS_REMOTE_READ;
+	key = (u8)(mr->rkey & 0x000000FF);
+	ib_update_fast_reg_key(mr, ++key);
+	fastreg_wr.wr.fast_reg.rkey = mr->rkey;
+
+	DECR_CQCOUNT(&r_xprt->rx_ep);
+	rc = ib_post_send(ia->ri_id->qp, &fastreg_wr, &bad_wr);
+	if (rc)
+		goto out_senderr;
+
+	seg1->mr_rkey = mr->rkey;
+	seg1->mr_base = seg1->mr_dma + pageoff;
+	seg1->mr_nsegs = i;
+	seg1->mr_len = len;
+	return i;
+
+out_senderr:
+	dprintk("RPC:       %s: ib_post_send status %i\n", __func__, rc);
+	ib_update_fast_reg_key(mr, --key);
+	frmr->fr_state = FRMR_IS_INVALID;
+	while (i--)
+		rpcrdma_unmap_one(device, --seg);
+	return rc;
+}
+
+/* Post a LOCAL_INV Work Request to prevent further remote access
+ * via RDMA READ or RDMA WRITE.
+ */
+static int
+frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
+{
+	struct rpcrdma_mr_seg *seg1 = seg;
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct ib_send_wr invalidate_wr, *bad_wr;
+	int rc, nsegs = seg->mr_nsegs;
+	struct ib_device *device;
+
+	seg1->rl_mw->r.frmr.fr_state = FRMR_IS_INVALID;
+
+	memset(&invalidate_wr, 0, sizeof(invalidate_wr));
+	invalidate_wr.wr_id = (unsigned long)(void *)seg1->rl_mw;
+	invalidate_wr.opcode = IB_WR_LOCAL_INV;
+	invalidate_wr.ex.invalidate_rkey = seg1->rl_mw->r.frmr.fr_mr->rkey;
+	DECR_CQCOUNT(&r_xprt->rx_ep);
+
+	read_lock(&ia->ri_qplock);
+	device = ia->ri_id->device;
+	while (seg1->mr_nsegs--)
+		rpcrdma_unmap_one(device, seg++);
+	rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
+	read_unlock(&ia->ri_qplock);
+	if (rc)
+		goto out_err;
+	return nsegs;
+
+out_err:
+	/* Force rpcrdma_buffer_get() to retry */
+	seg1->rl_mw->r.frmr.fr_state = FRMR_IS_STALE;
+	dprintk("RPC:       %s: ib_post_send status %i\n", __func__, rc);
+	return nsegs;
+}
+
+/* After a disconnect, a flushed FAST_REG_MR can leave an FRMR in
+ * an unusable state. Find FRMRs in this state and dereg / reg
+ * each.  FRMRs that are VALID and attached to an rpcrdma_req are
+ * also torn down.
+ *
+ * This gives all in-use FRMRs a fresh rkey and leaves them INVALID.
+ *
+ * This is invoked only in the transport connect worker in order
+ * to serialize with rpcrdma_register_frmr_external().
+ */
+static void
+frwr_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct ib_device *device = r_xprt->rx_ia.ri_id->device;
+	unsigned int depth = r_xprt->rx_ia.ri_max_frmr_depth;
+	struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
+	struct rpcrdma_mw *r;
+	int rc;
+
+	list_for_each_entry(r, &buf->rb_all, mw_all) {
+		if (r->r.frmr.fr_state == FRMR_IS_INVALID)
+			continue;
+
+		__frwr_release(r);
+		rc = __frwr_init(r, pd, device, depth);
+		if (rc) {
+			dprintk("RPC:       %s: mw %p left %s\n",
+				__func__, r,
+				(r->r.frmr.fr_state == FRMR_IS_STALE ?
+					"stale" : "valid"));
+			continue;
+		}
+
+		r->r.frmr.fr_state = FRMR_IS_INVALID;
+	}
+}
+
+static void
+frwr_op_destroy(struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_mw *r;
+
+	while (!list_empty(&buf->rb_all)) {
+		r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);
+		list_del(&r->mw_all);
+		__frwr_release(r);
+		kfree(r);
+	}
+}
+
+const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
+	.ro_map				= frwr_op_map,
+	.ro_unmap			= frwr_op_unmap,
+	.ro_open			= frwr_op_open,
+	.ro_maxpages			= frwr_op_maxpages,
+	.ro_init			= frwr_op_init,
+	.ro_reset			= frwr_op_reset,
+	.ro_destroy			= frwr_op_destroy,
+	.ro_displayname			= "frwr",
+};
diff --git a/kernel/net/sunrpc/xprtrdma/physical_ops.c b/kernel/net/sunrpc/xprtrdma/physical_ops.c
new file mode 100644
index 000000000..ba518af16
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/physical_ops.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2015 Oracle.  All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* No-op chunk preparation. All client memory is pre-registered.
+ * Sometimes referred to as ALLPHYSICAL mode.
+ *
+ * Physical registration is simple because all client memory is
+ * pre-registered and never deregistered. This mode is good for
+ * adapter bring up, but is considered not safe: the server is
+ * trusted not to abuse its access to client memory not involved
+ * in RDMA I/O.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+static int
+physical_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+		 struct rpcrdma_create_data_internal *cdata)
+{
+	return 0;
+}
+
+/* PHYSICAL memory registration conveys one page per chunk segment.
+ */
+static size_t
+physical_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+	return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+		     rpcrdma_max_segments(r_xprt));
+}
+
+static int
+physical_op_init(struct rpcrdma_xprt *r_xprt)
+{
+	return 0;
+}
+
+/* The client's physical memory is already exposed for
+ * remote access via RDMA READ or RDMA WRITE.
+ */
+static int
+physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
+		int nsegs, bool writing)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+	rpcrdma_map_one(ia->ri_id->device, seg,
+			rpcrdma_data_dir(writing));
+	seg->mr_rkey = ia->ri_bind_mem->rkey;
+	seg->mr_base = seg->mr_dma;
+	seg->mr_nsegs = 1;
+	return 1;
+}
+
+/* Unmap a memory region, but leave it registered.
+ */
+static int
+physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+	read_lock(&ia->ri_qplock);
+	rpcrdma_unmap_one(ia->ri_id->device, seg);
+	read_unlock(&ia->ri_qplock);
+
+	return 1;
+}
+
+static void
+physical_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+}
+
+static void
+physical_op_destroy(struct rpcrdma_buffer *buf)
+{
+}
+
+const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
+	.ro_map				= physical_op_map,
+	.ro_unmap			= physical_op_unmap,
+	.ro_open			= physical_op_open,
+	.ro_maxpages			= physical_op_maxpages,
+	.ro_init			= physical_op_init,
+	.ro_reset			= physical_op_reset,
+	.ro_destroy			= physical_op_destroy,
+	.ro_displayname			= "physical",
+};
diff --git a/kernel/net/sunrpc/xprtrdma/rpc_rdma.c b/kernel/net/sunrpc/xprtrdma/rpc_rdma.c
new file mode 100644
index 000000000..2c53ea9e1
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -0,0 +1,889 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * rpc_rdma.c
+ *
+ * This file contains the guts of the RPC RDMA protocol, and
+ * does marshaling/unmarshaling, etc. It is also where interfacing
+ * to the Linux RPC framework lives.
+ */
+
+#include "xprt_rdma.h"
+
+#include <linux/highmem.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+enum rpcrdma_chunktype {
+	rpcrdma_noch = 0,
+	rpcrdma_readch,
+	rpcrdma_areadch,
+	rpcrdma_writech,
+	rpcrdma_replych
+};
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+static const char transfertypes[][12] = {
+	"pure inline",	/* no chunks */
+	" read chunk",	/* some argument via rdma read */
+	"*read chunk",	/* entire request via rdma read */
+	"write chunk",	/* some result via rdma write */
+	"reply chunk"	/* entire reply via rdma write */
+};
+#endif
+
+/*
+ * Chunk assembly from upper layer xdr_buf.
+ *
+ * Prepare the passed-in xdr_buf into representation as RPC/RDMA chunk
+ * elements. Segments are then coalesced when registered, if possible
+ * within the selected memreg mode.
+ *
+ * Returns positive number of segments converted, or a negative errno.
+ */
+
+static int
+rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
+	enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg, int nsegs)
+{
+	int len, n = 0, p;
+	int page_base;
+	struct page **ppages;
+
+	if (pos == 0 && xdrbuf->head[0].iov_len) {
+		seg[n].mr_page = NULL;
+		seg[n].mr_offset = xdrbuf->head[0].iov_base;
+		seg[n].mr_len = xdrbuf->head[0].iov_len;
+		++n;
+	}
+
+	len = xdrbuf->page_len;
+	ppages = xdrbuf->pages + (xdrbuf->page_base >> PAGE_SHIFT);
+	page_base = xdrbuf->page_base & ~PAGE_MASK;
+	p = 0;
+	while (len && n < nsegs) {
+		if (!ppages[p]) {
+			/* alloc the pagelist for receiving buffer */
+			ppages[p] = alloc_page(GFP_ATOMIC);
+			if (!ppages[p])
+				return -ENOMEM;
+		}
+		seg[n].mr_page = ppages[p];
+		seg[n].mr_offset = (void *)(unsigned long) page_base;
+		seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);
+		if (seg[n].mr_len > PAGE_SIZE)
+			return -EIO;
+		len -= seg[n].mr_len;
+		++n;
+		++p;
+		page_base = 0;	/* page offset only applies to first page */
+	}
+
+	/* Message overflows the seg array */
+	if (len && n == nsegs)
+		return -EIO;
+
+	if (xdrbuf->tail[0].iov_len) {
+		/* the rpcrdma protocol allows us to omit any trailing
+		 * xdr pad bytes, saving the server an RDMA operation. */
+		if (xdrbuf->tail[0].iov_len < 4 && xprt_rdma_pad_optimize)
+			return n;
+		if (n == nsegs)
+			/* Tail remains, but we're out of segments */
+			return -EIO;
+		seg[n].mr_page = NULL;
+		seg[n].mr_offset = xdrbuf->tail[0].iov_base;
+		seg[n].mr_len = xdrbuf->tail[0].iov_len;
+		++n;
+	}
+
+	return n;
+}
+
+/*
+ * Create read/write chunk lists, and reply chunks, for RDMA
+ *
+ *   Assume check against THRESHOLD has been done, and chunks are required.
+ *   Assume only encoding one list entry for read|write chunks. The NFSv3
+ *     protocol is simple enough to allow this as it only has a single "bulk
+ *     result" in each procedure - complicated NFSv4 COMPOUNDs are not. (The
+ *     RDMA/Sessions NFSv4 proposal addresses this for future v4 revs.)
+ *
+ * When used for a single reply chunk (which is a special write
+ * chunk used for the entire reply, rather than just the data), it
+ * is used primarily for READDIR and READLINK which would otherwise
+ * be severely size-limited by a small rdma inline read max. The server
+ * response will come back as an RDMA Write, followed by a message
+ * of type RDMA_NOMSG carrying the xid and length. As a result, reply
+ * chunks do not provide data alignment, however they do not require
+ * "fixup" (moving the response to the upper layer buffer) either.
+ *
+ * Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
+ *
+ *  Read chunklist (a linked list):
+ *   N elements, position P (same P for all chunks of same arg!):
+ *    1 - PHLOO - 1 - PHLOO - ... - 1 - PHLOO - 0
+ *
+ *  Write chunklist (a list of (one) counted array):
+ *   N elements:
+ *    1 - N - HLOO - HLOO - ... - HLOO - 0
+ *
+ *  Reply chunk (a counted array):
+ *   N elements:
+ *    1 - N - HLOO - HLOO - ... - HLOO
+ *
+ * Returns positive RPC/RDMA header size, or negative errno.
+ */
+
+static ssize_t
+rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
+		struct rpcrdma_msg *headerp, enum rpcrdma_chunktype type)
+{
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
+	int n, nsegs, nchunks = 0;
+	unsigned int pos;
+	struct rpcrdma_mr_seg *seg = req->rl_segments;
+	struct rpcrdma_read_chunk *cur_rchunk = NULL;
+	struct rpcrdma_write_array *warray = NULL;
+	struct rpcrdma_write_chunk *cur_wchunk = NULL;
+	__be32 *iptr = headerp->rm_body.rm_chunks;
+	int (*map)(struct rpcrdma_xprt *, struct rpcrdma_mr_seg *, int, bool);
+
+	if (type == rpcrdma_readch || type == rpcrdma_areadch) {
+		/* a read chunk - server will RDMA Read our memory */
+		cur_rchunk = (struct rpcrdma_read_chunk *) iptr;
+	} else {
+		/* a write or reply chunk - server will RDMA Write our memory */
+		*iptr++ = xdr_zero;	/* encode a NULL read chunk list */
+		if (type == rpcrdma_replych)
+			*iptr++ = xdr_zero;	/* a NULL write chunk list */
+		warray = (struct rpcrdma_write_array *) iptr;
+		cur_wchunk = (struct rpcrdma_write_chunk *) (warray + 1);
+	}
+
+	if (type == rpcrdma_replych || type == rpcrdma_areadch)
+		pos = 0;
+	else
+		pos = target->head[0].iov_len;
+
+	nsegs = rpcrdma_convert_iovs(target, pos, type, seg, RPCRDMA_MAX_SEGS);
+	if (nsegs < 0)
+		return nsegs;
+
+	map = r_xprt->rx_ia.ri_ops->ro_map;
+	do {
+		n = map(r_xprt, seg, nsegs, cur_wchunk != NULL);
+		if (n <= 0)
+			goto out;
+		if (cur_rchunk) {	/* read */
+			cur_rchunk->rc_discrim = xdr_one;
+			/* all read chunks have the same "position" */
+			cur_rchunk->rc_position = cpu_to_be32(pos);
+			cur_rchunk->rc_target.rs_handle =
+						cpu_to_be32(seg->mr_rkey);
+			cur_rchunk->rc_target.rs_length =
+						cpu_to_be32(seg->mr_len);
+			xdr_encode_hyper(
+					(__be32 *)&cur_rchunk->rc_target.rs_offset,
+					seg->mr_base);
+			dprintk("RPC:       %s: read chunk "
+				"elem %d@0x%llx:0x%x pos %u (%s)\n", __func__,
+				seg->mr_len, (unsigned long long)seg->mr_base,
+				seg->mr_rkey, pos, n < nsegs ? "more" : "last");
+			cur_rchunk++;
+			r_xprt->rx_stats.read_chunk_count++;
+		} else {		/* write/reply */
+			cur_wchunk->wc_target.rs_handle =
+						cpu_to_be32(seg->mr_rkey);
+			cur_wchunk->wc_target.rs_length =
+						cpu_to_be32(seg->mr_len);
+			xdr_encode_hyper(
+					(__be32 *)&cur_wchunk->wc_target.rs_offset,
+					seg->mr_base);
+			dprintk("RPC:       %s: %s chunk "
+				"elem %d@0x%llx:0x%x (%s)\n", __func__,
+				(type == rpcrdma_replych) ? "reply" : "write",
+				seg->mr_len, (unsigned long long)seg->mr_base,
+				seg->mr_rkey, n < nsegs ? "more" : "last");
+			cur_wchunk++;
+			if (type == rpcrdma_replych)
+				r_xprt->rx_stats.reply_chunk_count++;
+			else
+				r_xprt->rx_stats.write_chunk_count++;
+			r_xprt->rx_stats.total_rdma_request += seg->mr_len;
+		}
+		nchunks++;
+		seg   += n;
+		nsegs -= n;
+	} while (nsegs);
+
+	/* success. all failures return above */
+	req->rl_nchunks = nchunks;
+
+	/*
+	 * finish off header. If write, marshal discrim and nchunks.
+	 */
+	if (cur_rchunk) {
+		iptr = (__be32 *) cur_rchunk;
+		*iptr++ = xdr_zero;	/* finish the read chunk list */
+		*iptr++ = xdr_zero;	/* encode a NULL write chunk list */
+		*iptr++ = xdr_zero;	/* encode a NULL reply chunk */
+	} else {
+		warray->wc_discrim = xdr_one;
+		warray->wc_nchunks = cpu_to_be32(nchunks);
+		iptr = (__be32 *) cur_wchunk;
+		if (type == rpcrdma_writech) {
+			*iptr++ = xdr_zero; /* finish the write chunk list */
+			*iptr++ = xdr_zero; /* encode a NULL reply chunk */
+		}
+	}
+
+	/*
+	 * Return header size.
+	 */
+	return (unsigned char *)iptr - (unsigned char *)headerp;
+
+out:
+	if (r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_FRMR)
+		return n;
+
+	for (pos = 0; nchunks--;)
+		pos += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt,
+						      &req->rl_segments[pos]);
+	return n;
+}
+
+/*
+ * Copy write data inline.
+ * This function is used for "small" requests. Data which is passed
+ * to RPC via iovecs (or page list) is copied directly into the
+ * pre-registered memory buffer for this request. For small amounts
+ * of data, this is efficient. The cutoff value is tunable.
+ */
+static int
+rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
+{
+	int i, npages, curlen;
+	int copy_len;
+	unsigned char *srcp, *destp;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
+	int page_base;
+	struct page **ppages;
+
+	destp = rqst->rq_svec[0].iov_base;
+	curlen = rqst->rq_svec[0].iov_len;
+	destp += curlen;
+	/*
+	 * Do optional padding where it makes sense. Alignment of write
+	 * payload can help the server, if our setting is accurate.
+	 */
+	pad -= (curlen + 36/*sizeof(struct rpcrdma_msg_padded)*/);
+	if (pad < 0 || rqst->rq_slen - curlen < RPCRDMA_INLINE_PAD_THRESH)
+		pad = 0;	/* don't pad this request */
+
+	dprintk("RPC:       %s: pad %d destp 0x%p len %d hdrlen %d\n",
+		__func__, pad, destp, rqst->rq_slen, curlen);
+
+	copy_len = rqst->rq_snd_buf.page_len;
+
+	if (rqst->rq_snd_buf.tail[0].iov_len) {
+		curlen = rqst->rq_snd_buf.tail[0].iov_len;
+		if (destp + copy_len != rqst->rq_snd_buf.tail[0].iov_base) {
+			memmove(destp + copy_len,
+				rqst->rq_snd_buf.tail[0].iov_base, curlen);
+			r_xprt->rx_stats.pullup_copy_count += curlen;
+		}
+		dprintk("RPC:       %s: tail destp 0x%p len %d\n",
+			__func__, destp + copy_len, curlen);
+		rqst->rq_svec[0].iov_len += curlen;
+	}
+	r_xprt->rx_stats.pullup_copy_count += copy_len;
+
+	page_base = rqst->rq_snd_buf.page_base;
+	ppages = rqst->rq_snd_buf.pages + (page_base >> PAGE_SHIFT);
+	page_base &= ~PAGE_MASK;
+	npages = PAGE_ALIGN(page_base+copy_len) >> PAGE_SHIFT;
+	for (i = 0; copy_len && i < npages; i++) {
+		curlen = PAGE_SIZE - page_base;
+		if (curlen > copy_len)
+			curlen = copy_len;
+		dprintk("RPC:       %s: page %d destp 0x%p len %d curlen %d\n",
+			__func__, i, destp, copy_len, curlen);
+		srcp = kmap_atomic(ppages[i]);
+		memcpy(destp, srcp+page_base, curlen);
+		kunmap_atomic(srcp);
+		rqst->rq_svec[0].iov_len += curlen;
+		destp += curlen;
+		copy_len -= curlen;
+		page_base = 0;
+	}
+	/* header now contains entire send message */
+	return pad;
+}
+
+/*
+ * Marshal a request: the primary job of this routine is to choose
+ * the transfer modes. See comments below.
+ *
+ * Uses multiple RDMA IOVs for a request:
+ *  [0] -- RPC RDMA header, which uses memory from the *start* of the
+ *         preregistered buffer that already holds the RPC data in
+ *         its middle.
+ *  [1] -- the RPC header/data, marshaled by RPC and the NFS protocol.
+ *  [2] -- optional padding.
+ *  [3] -- if padded, header only in [1] and data here.
+ *
+ * Returns zero on success, otherwise a negative errno.
+ */
+
+int
+rpcrdma_marshal_req(struct rpc_rqst *rqst)
+{
+	struct rpc_xprt *xprt = rqst->rq_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	char *base;
+	size_t rpclen, padlen;
+	ssize_t hdrlen;
+	enum rpcrdma_chunktype rtype, wtype;
+	struct rpcrdma_msg *headerp;
+
+	/*
+	 * rpclen gets amount of data in first buffer, which is the
+	 * pre-registered buffer.
+	 */
+	base = rqst->rq_svec[0].iov_base;
+	rpclen = rqst->rq_svec[0].iov_len;
+
+	headerp = rdmab_to_msg(req->rl_rdmabuf);
+	/* don't byte-swap XID, it's already done in request */
+	headerp->rm_xid = rqst->rq_xid;
+	headerp->rm_vers = rpcrdma_version;
+	headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_max_requests);
+	headerp->rm_type = rdma_msg;
+
+	/*
+	 * Chunks needed for results?
+	 *
+	 * o If the expected result is under the inline threshold, all ops
+	 *   return as inline (but see later).
+	 * o Large non-read ops return as a single reply chunk.
+	 * o Large read ops return data as write chunk(s), header as inline.
+	 *
+	 * Note: the NFS code sending down multiple result segments implies
+	 * the op is one of read, readdir[plus], readlink or NFSv4 getacl.
+	 */
+
+	/*
+	 * This code can handle read chunks, write chunks OR reply
+	 * chunks -- only one type. If the request is too big to fit
+	 * inline, then we will choose read chunks. If the request is
+	 * a READ, then use write chunks to separate the file data
+	 * into pages; otherwise use reply chunks.
+	 */
+	if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst))
+		wtype = rpcrdma_noch;
+	else if (rqst->rq_rcv_buf.page_len == 0)
+		wtype = rpcrdma_replych;
+	else if (rqst->rq_rcv_buf.flags & XDRBUF_READ)
+		wtype = rpcrdma_writech;
+	else
+		wtype = rpcrdma_replych;
+
+	/*
+	 * Chunks needed for arguments?
+	 *
+	 * o If the total request is under the inline threshold, all ops
+	 *   are sent as inline.
+	 * o Large non-write ops are sent with the entire message as a
+	 *   single read chunk (protocol 0-position special case).
+	 * o Large write ops transmit data as read chunk(s), header as
+	 *   inline.
+	 *
+	 * Note: the NFS code sending down multiple argument segments
+	 * implies the op is a write.
+	 * TBD check NFSv4 setacl
+	 */
+	if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst))
+		rtype = rpcrdma_noch;
+	else if (rqst->rq_snd_buf.page_len == 0)
+		rtype = rpcrdma_areadch;
+	else
+		rtype = rpcrdma_readch;
+
+	/* The following simplification is not true forever */
+	if (rtype != rpcrdma_noch && wtype == rpcrdma_replych)
+		wtype = rpcrdma_noch;
+	if (rtype != rpcrdma_noch && wtype != rpcrdma_noch) {
+		dprintk("RPC:       %s: cannot marshal multiple chunk lists\n",
+			__func__);
+		return -EIO;
+	}
+
+	hdrlen = RPCRDMA_HDRLEN_MIN;
+	padlen = 0;
+
+	/*
+	 * Pull up any extra send data into the preregistered buffer.
+	 * When padding is in use and applies to the transfer, insert
+	 * it and change the message type.
+	 */
+	if (rtype == rpcrdma_noch) {
+
+		padlen = rpcrdma_inline_pullup(rqst,
+						RPCRDMA_INLINE_PAD_VALUE(rqst));
+
+		if (padlen) {
+			headerp->rm_type = rdma_msgp;
+			headerp->rm_body.rm_padded.rm_align =
+				cpu_to_be32(RPCRDMA_INLINE_PAD_VALUE(rqst));
+			headerp->rm_body.rm_padded.rm_thresh =
+				cpu_to_be32(RPCRDMA_INLINE_PAD_THRESH);
+			headerp->rm_body.rm_padded.rm_pempty[0] = xdr_zero;
+			headerp->rm_body.rm_padded.rm_pempty[1] = xdr_zero;
+			headerp->rm_body.rm_padded.rm_pempty[2] = xdr_zero;
+			hdrlen += 2 * sizeof(u32); /* extra words in padhdr */
+			if (wtype != rpcrdma_noch) {
+				dprintk("RPC:       %s: invalid chunk list\n",
+					__func__);
+				return -EIO;
+			}
+		} else {
+			headerp->rm_body.rm_nochunks.rm_empty[0] = xdr_zero;
+			headerp->rm_body.rm_nochunks.rm_empty[1] = xdr_zero;
+			headerp->rm_body.rm_nochunks.rm_empty[2] = xdr_zero;
+			/* new length after pullup */
+			rpclen = rqst->rq_svec[0].iov_len;
+			/*
+			 * Currently we try to not actually use read inline.
+			 * Reply chunks have the desirable property that
+			 * they land, packed, directly in the target buffers
+			 * without headers, so they require no fixup. The
+			 * additional RDMA Write op sends the same amount
+			 * of data, streams on-the-wire and adds no overhead
+			 * on receive. Therefore, we request a reply chunk
+			 * for non-writes wherever feasible and efficient.
+			 */
+			if (wtype == rpcrdma_noch)
+				wtype = rpcrdma_replych;
+		}
+	}
+
+	if (rtype != rpcrdma_noch) {
+		hdrlen = rpcrdma_create_chunks(rqst, &rqst->rq_snd_buf,
+					       headerp, rtype);
+		wtype = rtype;	/* simplify dprintk */
+
+	} else if (wtype != rpcrdma_noch) {
+		hdrlen = rpcrdma_create_chunks(rqst, &rqst->rq_rcv_buf,
+					       headerp, wtype);
+	}
+	if (hdrlen < 0)
+		return hdrlen;
+
+	dprintk("RPC:       %s: %s: hdrlen %zd rpclen %zd padlen %zd"
+		" headerp 0x%p base 0x%p lkey 0x%x\n",
+		__func__, transfertypes[wtype], hdrlen, rpclen, padlen,
+		headerp, base, rdmab_lkey(req->rl_rdmabuf));
+
+	/*
+	 * initialize send_iov's - normally only two: rdma chunk header and
+	 * single preregistered RPC header buffer, but if padding is present,
+	 * then use a preregistered (and zeroed) pad buffer between the RPC
+	 * header and any write data. In all non-rdma cases, any following
+	 * data has been copied into the RPC header buffer.
+	 */
+	req->rl_send_iov[0].addr = rdmab_addr(req->rl_rdmabuf);
+	req->rl_send_iov[0].length = hdrlen;
+	req->rl_send_iov[0].lkey = rdmab_lkey(req->rl_rdmabuf);
+
+	req->rl_send_iov[1].addr = rdmab_addr(req->rl_sendbuf);
+	req->rl_send_iov[1].length = rpclen;
+	req->rl_send_iov[1].lkey = rdmab_lkey(req->rl_sendbuf);
+
+	req->rl_niovs = 2;
+
+	if (padlen) {
+		struct rpcrdma_ep *ep = &r_xprt->rx_ep;
+
+		req->rl_send_iov[2].addr = rdmab_addr(ep->rep_padbuf);
+		req->rl_send_iov[2].length = padlen;
+		req->rl_send_iov[2].lkey = rdmab_lkey(ep->rep_padbuf);
+
+		req->rl_send_iov[3].addr = req->rl_send_iov[1].addr + rpclen;
+		req->rl_send_iov[3].length = rqst->rq_slen - rpclen;
+		req->rl_send_iov[3].lkey = rdmab_lkey(req->rl_sendbuf);
+
+		req->rl_niovs = 4;
+	}
+
+	return 0;
+}
+
+/*
+ * Chase down a received write or reply chunklist to get length
+ * RDMA'd by server. See map at rpcrdma_create_chunks()! :-)
+ */
+static int
+rpcrdma_count_chunks(struct rpcrdma_rep *rep, unsigned int max, int wrchunk, __be32 **iptrp)
+{
+	unsigned int i, total_len;
+	struct rpcrdma_write_chunk *cur_wchunk;
+	char *base = (char *)rdmab_to_msg(rep->rr_rdmabuf);
+
+	i = be32_to_cpu(**iptrp);
+	if (i > max)
+		return -1;
+	cur_wchunk = (struct rpcrdma_write_chunk *) (*iptrp + 1);
+	total_len = 0;
+	while (i--) {
+		struct rpcrdma_segment *seg = &cur_wchunk->wc_target;
+		ifdebug(FACILITY) {
+			u64 off;
+			xdr_decode_hyper((__be32 *)&seg->rs_offset, &off);
+			dprintk("RPC:       %s: chunk %d@0x%llx:0x%x\n",
+				__func__,
+				be32_to_cpu(seg->rs_length),
+				(unsigned long long)off,
+				be32_to_cpu(seg->rs_handle));
+		}
+		total_len += be32_to_cpu(seg->rs_length);
+		++cur_wchunk;
+	}
+	/* check and adjust for properly terminated write chunk */
+	if (wrchunk) {
+		__be32 *w = (__be32 *) cur_wchunk;
+		if (*w++ != xdr_zero)
+			return -1;
+		cur_wchunk = (struct rpcrdma_write_chunk *) w;
+	}
+	if ((char *)cur_wchunk > base + rep->rr_len)
+		return -1;
+
+	*iptrp = (__be32 *) cur_wchunk;
+	return total_len;
+}
+
+/*
+ * Scatter inline received data back into provided iov's.
+ */
+static void
+rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
+{
+	int i, npages, curlen, olen;
+	char *destp;
+	struct page **ppages;
+	int page_base;
+
+	curlen = rqst->rq_rcv_buf.head[0].iov_len;
+	if (curlen > copy_len) {	/* write chunk header fixup */
+		curlen = copy_len;
+		rqst->rq_rcv_buf.head[0].iov_len = curlen;
+	}
+
+	dprintk("RPC:       %s: srcp 0x%p len %d hdrlen %d\n",
+		__func__, srcp, copy_len, curlen);
+
+	/* Shift pointer for first receive segment only */
+	rqst->rq_rcv_buf.head[0].iov_base = srcp;
+	srcp += curlen;
+	copy_len -= curlen;
+
+	olen = copy_len;
+	i = 0;
+	rpcx_to_rdmax(rqst->rq_xprt)->rx_stats.fixup_copy_count += olen;
+	page_base = rqst->rq_rcv_buf.page_base;
+	ppages = rqst->rq_rcv_buf.pages + (page_base >> PAGE_SHIFT);
+	page_base &= ~PAGE_MASK;
+
+	if (copy_len && rqst->rq_rcv_buf.page_len) {
+		npages = PAGE_ALIGN(page_base +
+			rqst->rq_rcv_buf.page_len) >> PAGE_SHIFT;
+		for (; i < npages; i++) {
+			curlen = PAGE_SIZE - page_base;
+			if (curlen > copy_len)
+				curlen = copy_len;
+			dprintk("RPC:       %s: page %d"
+				" srcp 0x%p len %d curlen %d\n",
+				__func__, i, srcp, copy_len, curlen);
+			destp = kmap_atomic(ppages[i]);
+			memcpy(destp + page_base, srcp, curlen);
+			flush_dcache_page(ppages[i]);
+			kunmap_atomic(destp);
+			srcp += curlen;
+			copy_len -= curlen;
+			if (copy_len == 0)
+				break;
+			page_base = 0;
+		}
+	}
+
+	if (copy_len && rqst->rq_rcv_buf.tail[0].iov_len) {
+		curlen = copy_len;
+		if (curlen > rqst->rq_rcv_buf.tail[0].iov_len)
+			curlen = rqst->rq_rcv_buf.tail[0].iov_len;
+		if (rqst->rq_rcv_buf.tail[0].iov_base != srcp)
+			memmove(rqst->rq_rcv_buf.tail[0].iov_base, srcp, curlen);
+		dprintk("RPC:       %s: tail srcp 0x%p len %d curlen %d\n",
+			__func__, srcp, copy_len, curlen);
+		rqst->rq_rcv_buf.tail[0].iov_len = curlen;
+		copy_len -= curlen; ++i;
+	} else
+		rqst->rq_rcv_buf.tail[0].iov_len = 0;
+
+	if (pad) {
+		/* implicit padding on terminal chunk */
+		unsigned char *p = rqst->rq_rcv_buf.tail[0].iov_base;
+		while (pad--)
+			p[rqst->rq_rcv_buf.tail[0].iov_len++] = 0;
+	}
+
+	if (copy_len)
+		dprintk("RPC:       %s: %d bytes in"
+			" %d extra segments (%d lost)\n",
+			__func__, olen, i, copy_len);
+
+	/* TBD avoid a warning from call_decode() */
+	rqst->rq_private_buf = rqst->rq_rcv_buf;
+}
+
+void
+rpcrdma_connect_worker(struct work_struct *work)
+{
+	struct rpcrdma_ep *ep =
+		container_of(work, struct rpcrdma_ep, rep_connect_worker.work);
+	struct rpcrdma_xprt *r_xprt =
+		container_of(ep, struct rpcrdma_xprt, rx_ep);
+	struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+
+	spin_lock_bh(&xprt->transport_lock);
+	if (++xprt->connect_cookie == 0)	/* maintain a reserved value */
+		++xprt->connect_cookie;
+	if (ep->rep_connected > 0) {
+		if (!xprt_test_and_set_connected(xprt))
+			xprt_wake_pending_tasks(xprt, 0);
+	} else {
+		if (xprt_test_and_clear_connected(xprt))
+			xprt_wake_pending_tasks(xprt, -ENOTCONN);
+	}
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/*
+ * This function is called when an async event is posted to
+ * the connection which changes the connection state. All it
+ * does at this point is mark the connection up/down, the rpc
+ * timers do the rest.
+ */
+void
+rpcrdma_conn_func(struct rpcrdma_ep *ep)
+{
+	schedule_delayed_work(&ep->rep_connect_worker, 0);
+}
+
+/*
+ * Called as a tasklet to do req/reply match and complete a request
+ * Errors must result in the RPC task either being awakened, or
+ * allowed to timeout, to discover the errors at that time.
+ */
+void
+rpcrdma_reply_handler(struct rpcrdma_rep *rep)
+{
+	struct rpcrdma_msg *headerp;
+	struct rpcrdma_req *req;
+	struct rpc_rqst *rqst;
+	struct rpc_xprt *xprt = rep->rr_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	__be32 *iptr;
+	int rdmalen, status;
+	unsigned long cwnd;
+	u32 credits;
+
+	/* Check status. If bad, signal disconnect and return rep to pool */
+	if (rep->rr_len == ~0U) {
+		rpcrdma_recv_buffer_put(rep);
+		if (r_xprt->rx_ep.rep_connected == 1) {
+			r_xprt->rx_ep.rep_connected = -EIO;
+			rpcrdma_conn_func(&r_xprt->rx_ep);
+		}
+		return;
+	}
+	if (rep->rr_len < RPCRDMA_HDRLEN_MIN) {
+		dprintk("RPC:       %s: short/invalid reply\n", __func__);
+		goto repost;
+	}
+	headerp = rdmab_to_msg(rep->rr_rdmabuf);
+	if (headerp->rm_vers != rpcrdma_version) {
+		dprintk("RPC:       %s: invalid version %d\n",
+			__func__, be32_to_cpu(headerp->rm_vers));
+		goto repost;
+	}
+
+	/* Get XID and try for a match. */
+	spin_lock(&xprt->transport_lock);
+	rqst = xprt_lookup_rqst(xprt, headerp->rm_xid);
+	if (rqst == NULL) {
+		spin_unlock(&xprt->transport_lock);
+		dprintk("RPC:       %s: reply 0x%p failed "
+			"to match any request xid 0x%08x len %d\n",
+			__func__, rep, be32_to_cpu(headerp->rm_xid),
+			rep->rr_len);
+repost:
+		r_xprt->rx_stats.bad_reply_count++;
+		rep->rr_func = rpcrdma_reply_handler;
+		if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, &r_xprt->rx_ep, rep))
+			rpcrdma_recv_buffer_put(rep);
+
+		return;
+	}
+
+	/* get request object */
+	req = rpcr_to_rdmar(rqst);
+	if (req->rl_reply) {
+		spin_unlock(&xprt->transport_lock);
+		dprintk("RPC:       %s: duplicate reply 0x%p to RPC "
+			"request 0x%p: xid 0x%08x\n", __func__, rep, req,
+			be32_to_cpu(headerp->rm_xid));
+		goto repost;
+	}
+
+	dprintk("RPC:       %s: reply 0x%p completes request 0x%p\n"
+		"                   RPC request 0x%p xid 0x%08x\n",
+			__func__, rep, req, rqst,
+			be32_to_cpu(headerp->rm_xid));
+
+	/* from here on, the reply is no longer an orphan */
+	req->rl_reply = rep;
+	xprt->reestablish_timeout = 0;
+
+	/* check for expected message types */
+	/* The order of some of these tests is important. */
+	switch (headerp->rm_type) {
+	case rdma_msg:
+		/* never expect read chunks */
+		/* never expect reply chunks (two ways to check) */
+		/* never expect write chunks without having offered RDMA */
+		if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
+		    (headerp->rm_body.rm_chunks[1] == xdr_zero &&
+		     headerp->rm_body.rm_chunks[2] != xdr_zero) ||
+		    (headerp->rm_body.rm_chunks[1] != xdr_zero &&
+		     req->rl_nchunks == 0))
+			goto badheader;
+		if (headerp->rm_body.rm_chunks[1] != xdr_zero) {
+			/* count any expected write chunks in read reply */
+			/* start at write chunk array count */
+			iptr = &headerp->rm_body.rm_chunks[2];
+			rdmalen = rpcrdma_count_chunks(rep,
+						req->rl_nchunks, 1, &iptr);
+			/* check for validity, and no reply chunk after */
+			if (rdmalen < 0 || *iptr++ != xdr_zero)
+				goto badheader;
+			rep->rr_len -=
+			    ((unsigned char *)iptr - (unsigned char *)headerp);
+			status = rep->rr_len + rdmalen;
+			r_xprt->rx_stats.total_rdma_reply += rdmalen;
+			/* special case - last chunk may omit padding */
+			if (rdmalen &= 3) {
+				rdmalen = 4 - rdmalen;
+				status += rdmalen;
+			}
+		} else {
+			/* else ordinary inline */
+			rdmalen = 0;
+			iptr = (__be32 *)((unsigned char *)headerp +
+							RPCRDMA_HDRLEN_MIN);
+			rep->rr_len -= RPCRDMA_HDRLEN_MIN;
+			status = rep->rr_len;
+		}
+		/* Fix up the rpc results for upper layer */
+		rpcrdma_inline_fixup(rqst, (char *)iptr, rep->rr_len, rdmalen);
+		break;
+
+	case rdma_nomsg:
+		/* never expect read or write chunks, always reply chunks */
+		if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
+		    headerp->rm_body.rm_chunks[1] != xdr_zero ||
+		    headerp->rm_body.rm_chunks[2] != xdr_one ||
+		    req->rl_nchunks == 0)
+			goto badheader;
+		iptr = (__be32 *)((unsigned char *)headerp +
+							RPCRDMA_HDRLEN_MIN);
+		rdmalen = rpcrdma_count_chunks(rep, req->rl_nchunks, 0, &iptr);
+		if (rdmalen < 0)
+			goto badheader;
+		r_xprt->rx_stats.total_rdma_reply += rdmalen;
+		/* Reply chunk buffer already is the reply vector - no fixup. */
+		status = rdmalen;
+		break;
+
+badheader:
+	default:
+		dprintk("%s: invalid rpcrdma reply header (type %d):"
+				" chunks[012] == %d %d %d"
+				" expected chunks <= %d\n",
+				__func__, be32_to_cpu(headerp->rm_type),
+				headerp->rm_body.rm_chunks[0],
+				headerp->rm_body.rm_chunks[1],
+				headerp->rm_body.rm_chunks[2],
+				req->rl_nchunks);
+		status = -EIO;
+		r_xprt->rx_stats.bad_reply_count++;
+		break;
+	}
+
+	credits = be32_to_cpu(headerp->rm_credit);
+	if (credits == 0)
+		credits = 1;	/* don't deadlock */
+	else if (credits > r_xprt->rx_buf.rb_max_requests)
+		credits = r_xprt->rx_buf.rb_max_requests;
+
+	cwnd = xprt->cwnd;
+	xprt->cwnd = credits << RPC_CWNDSHIFT;
+	if (xprt->cwnd > cwnd)
+		xprt_release_rqst_cong(rqst->rq_task);
+
+	dprintk("RPC:       %s: xprt_complete_rqst(0x%p, 0x%p, %d)\n",
+			__func__, xprt, rqst, status);
+	xprt_complete_rqst(rqst->rq_task, status);
+	spin_unlock(&xprt->transport_lock);
+}
diff --git a/kernel/net/sunrpc/xprtrdma/svc_rdma.c b/kernel/net/sunrpc/xprtrdma/svc_rdma.c
new file mode 100644
index 000000000..c1b627026
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/svc_rdma.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/svc_rdma.h>
+#include "xprt_rdma.h"
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/* RPC/RDMA parameters */
+unsigned int svcrdma_ord = RPCRDMA_ORD;
+static unsigned int min_ord = 1;
+static unsigned int max_ord = 4096;
+unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
+static unsigned int min_max_requests = 4;
+static unsigned int max_max_requests = 16384;
+unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
+static unsigned int min_max_inline = 4096;
+static unsigned int max_max_inline = 65536;
+
+atomic_t rdma_stat_recv;
+atomic_t rdma_stat_read;
+atomic_t rdma_stat_write;
+atomic_t rdma_stat_sq_starve;
+atomic_t rdma_stat_rq_starve;
+atomic_t rdma_stat_rq_poll;
+atomic_t rdma_stat_rq_prod;
+atomic_t rdma_stat_sq_poll;
+atomic_t rdma_stat_sq_prod;
+
+/* Temporary NFS request map and context caches */
+struct kmem_cache *svc_rdma_map_cachep;
+struct kmem_cache *svc_rdma_ctxt_cachep;
+
+struct workqueue_struct *svc_rdma_wq;
+
+/*
+ * This function implements reading and resetting an atomic_t stat
+ * variable through read/write to a proc file. Any write to the file
+ * resets the associated statistic to zero. Any read returns it's
+ * current value.
+ */
+static int read_reset_stat(struct ctl_table *table, int write,
+			   void __user *buffer, size_t *lenp,
+			   loff_t *ppos)
+{
+	atomic_t *stat = (atomic_t *)table->data;
+
+	if (!stat)
+		return -EINVAL;
+
+	if (write)
+		atomic_set(stat, 0);
+	else {
+		char str_buf[32];
+		char *data;
+		int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
+		if (len >= 32)
+			return -EFAULT;
+		len = strlen(str_buf);
+		if (*ppos > len) {
+			*lenp = 0;
+			return 0;
+		}
+		data = &str_buf[*ppos];
+		len -= *ppos;
+		if (len > *lenp)
+			len = *lenp;
+		if (len && copy_to_user(buffer, str_buf, len))
+			return -EFAULT;
+		*lenp = len;
+		*ppos += len;
+	}
+	return 0;
+}
+
+static struct ctl_table_header *svcrdma_table_header;
+static struct ctl_table svcrdma_parm_table[] = {
+	{
+		.procname	= "max_requests",
+		.data		= &svcrdma_max_requests,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_max_requests,
+		.extra2		= &max_max_requests
+	},
+	{
+		.procname	= "max_req_size",
+		.data		= &svcrdma_max_req_size,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_max_inline,
+		.extra2		= &max_max_inline
+	},
+	{
+		.procname	= "max_outbound_read_requests",
+		.data		= &svcrdma_ord,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_ord,
+		.extra2		= &max_ord,
+	},
+
+	{
+		.procname	= "rdma_stat_read",
+		.data		= &rdma_stat_read,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_recv",
+		.data		= &rdma_stat_recv,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_write",
+		.data		= &rdma_stat_write,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_starve",
+		.data		= &rdma_stat_sq_starve,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_starve",
+		.data		= &rdma_stat_rq_starve,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_poll",
+		.data		= &rdma_stat_rq_poll,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_prod",
+		.data		= &rdma_stat_rq_prod,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_poll",
+		.data		= &rdma_stat_sq_poll,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_prod",
+		.data		= &rdma_stat_sq_prod,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= read_reset_stat,
+	},
+	{ },
+};
+
+static struct ctl_table svcrdma_table[] = {
+	{
+		.procname	= "svc_rdma",
+		.mode		= 0555,
+		.child		= svcrdma_parm_table
+	},
+	{ },
+};
+
+static struct ctl_table svcrdma_root_table[] = {
+	{
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= svcrdma_table
+	},
+	{ },
+};
+
+void svc_rdma_cleanup(void)
+{
+	dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
+	destroy_workqueue(svc_rdma_wq);
+	if (svcrdma_table_header) {
+		unregister_sysctl_table(svcrdma_table_header);
+		svcrdma_table_header = NULL;
+	}
+	svc_unreg_xprt_class(&svc_rdma_class);
+	kmem_cache_destroy(svc_rdma_map_cachep);
+	kmem_cache_destroy(svc_rdma_ctxt_cachep);
+}
+
+int svc_rdma_init(void)
+{
+	dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
+	dprintk("\tsvcrdma_ord      : %d\n", svcrdma_ord);
+	dprintk("\tmax_requests     : %d\n", svcrdma_max_requests);
+	dprintk("\tsq_depth         : %d\n",
+		svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
+	dprintk("\tmax_inline       : %d\n", svcrdma_max_req_size);
+
+	svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
+	if (!svc_rdma_wq)
+		return -ENOMEM;
+
+	if (!svcrdma_table_header)
+		svcrdma_table_header =
+			register_sysctl_table(svcrdma_root_table);
+
+	/* Create the temporary map cache */
+	svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
+						sizeof(struct svc_rdma_req_map),
+						0,
+						SLAB_HWCACHE_ALIGN,
+						NULL);
+	if (!svc_rdma_map_cachep) {
+		printk(KERN_INFO "Could not allocate map cache.\n");
+		goto err0;
+	}
+
+	/* Create the temporary context cache */
+	svc_rdma_ctxt_cachep =
+		kmem_cache_create("svc_rdma_ctxt_cache",
+				  sizeof(struct svc_rdma_op_ctxt),
+				  0,
+				  SLAB_HWCACHE_ALIGN,
+				  NULL);
+	if (!svc_rdma_ctxt_cachep) {
+		printk(KERN_INFO "Could not allocate WR ctxt cache.\n");
+		goto err1;
+	}
+
+	/* Register RDMA with the SVC transport switch */
+	svc_reg_xprt_class(&svc_rdma_class);
+	return 0;
+ err1:
+	kmem_cache_destroy(svc_rdma_map_cachep);
+ err0:
+	unregister_sysctl_table(svcrdma_table_header);
+	destroy_workqueue(svc_rdma_wq);
+	return -ENOMEM;
+}
+MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
+MODULE_DESCRIPTION("SVC RDMA Transport");
+MODULE_LICENSE("Dual BSD/GPL");
+module_init(svc_rdma_init);
+module_exit(svc_rdma_cleanup);
diff --git a/kernel/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/kernel/net/sunrpc/xprtrdma/svc_rdma_marshal.c
new file mode 100644
index 000000000..b681855cf
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/debug.h>
+#include <asm/unaligned.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/*
+ * Decodes a read chunk list. The expected format is as follows:
+ *    descrim  : xdr_one
+ *    position : u32 offset into XDR stream
+ *    handle   : u32 RKEY
+ *    . . .
+ *  end-of-list: xdr_zero
+ */
+static u32 *decode_read_list(u32 *va, u32 *vaend)
+{
+	struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
+
+	while (ch->rc_discrim != xdr_zero) {
+		if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
+		    (unsigned long)vaend) {
+			dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
+			return NULL;
+		}
+		ch++;
+	}
+	return (u32 *)&ch->rc_position;
+}
+
+/*
+ * Decodes a write chunk list. The expected format is as follows:
+ *    descrim  : xdr_one
+ *    nchunks  : <count>
+ *       handle   : u32 RKEY              ---+
+ *       length   : u32 <len of segment>     |
+ *       offset   : remove va                + <count>
+ *       . . .                               |
+ *                                        ---+
+ */
+static u32 *decode_write_list(u32 *va, u32 *vaend)
+{
+	unsigned long start, end;
+	int nchunks;
+
+	struct rpcrdma_write_array *ary =
+		(struct rpcrdma_write_array *)va;
+
+	/* Check for not write-array */
+	if (ary->wc_discrim == xdr_zero)
+		return (u32 *)&ary->wc_nchunks;
+
+	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
+		return NULL;
+	}
+	nchunks = ntohl(ary->wc_nchunks);
+
+	start = (unsigned long)&ary->wc_array[0];
+	end = (unsigned long)vaend;
+	if (nchunks < 0 ||
+	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
+	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
+		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
+			ary, nchunks, vaend);
+		return NULL;
+	}
+	/*
+	 * rs_length is the 2nd 4B field in wc_target and taking its
+	 * address skips the list terminator
+	 */
+	return (u32 *)&ary->wc_array[nchunks].wc_target.rs_length;
+}
+
+static u32 *decode_reply_array(u32 *va, u32 *vaend)
+{
+	unsigned long start, end;
+	int nchunks;
+	struct rpcrdma_write_array *ary =
+		(struct rpcrdma_write_array *)va;
+
+	/* Check for no reply-array */
+	if (ary->wc_discrim == xdr_zero)
+		return (u32 *)&ary->wc_nchunks;
+
+	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
+		return NULL;
+	}
+	nchunks = ntohl(ary->wc_nchunks);
+
+	start = (unsigned long)&ary->wc_array[0];
+	end = (unsigned long)vaend;
+	if (nchunks < 0 ||
+	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
+	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
+		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
+			ary, nchunks, vaend);
+		return NULL;
+	}
+	return (u32 *)&ary->wc_array[nchunks];
+}
+
+int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req,
+			    struct svc_rqst *rqstp)
+{
+	struct rpcrdma_msg *rmsgp = NULL;
+	u32 *va;
+	u32 *vaend;
+	u32 hdr_len;
+
+	rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
+
+	/* Verify that there's enough bytes for header + something */
+	if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_MIN) {
+		dprintk("svcrdma: header too short = %d\n",
+			rqstp->rq_arg.len);
+		return -EINVAL;
+	}
+
+	/* Decode the header */
+	rmsgp->rm_xid = ntohl(rmsgp->rm_xid);
+	rmsgp->rm_vers = ntohl(rmsgp->rm_vers);
+	rmsgp->rm_credit = ntohl(rmsgp->rm_credit);
+	rmsgp->rm_type = ntohl(rmsgp->rm_type);
+
+	if (rmsgp->rm_vers != RPCRDMA_VERSION)
+		return -ENOSYS;
+
+	/* Pull in the extra for the padded case and bump our pointer */
+	if (rmsgp->rm_type == RDMA_MSGP) {
+		int hdrlen;
+		rmsgp->rm_body.rm_padded.rm_align =
+			ntohl(rmsgp->rm_body.rm_padded.rm_align);
+		rmsgp->rm_body.rm_padded.rm_thresh =
+			ntohl(rmsgp->rm_body.rm_padded.rm_thresh);
+
+		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
+		rqstp->rq_arg.head[0].iov_base = va;
+		hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
+		rqstp->rq_arg.head[0].iov_len -= hdrlen;
+		if (hdrlen > rqstp->rq_arg.len)
+			return -EINVAL;
+		return hdrlen;
+	}
+
+	/* The chunk list may contain either a read chunk list or a write
+	 * chunk list and a reply chunk list.
+	 */
+	va = &rmsgp->rm_body.rm_chunks[0];
+	vaend = (u32 *)((unsigned long)rmsgp + rqstp->rq_arg.len);
+	va = decode_read_list(va, vaend);
+	if (!va)
+		return -EINVAL;
+	va = decode_write_list(va, vaend);
+	if (!va)
+		return -EINVAL;
+	va = decode_reply_array(va, vaend);
+	if (!va)
+		return -EINVAL;
+
+	rqstp->rq_arg.head[0].iov_base = va;
+	hdr_len = (unsigned long)va - (unsigned long)rmsgp;
+	rqstp->rq_arg.head[0].iov_len -= hdr_len;
+
+	*rdma_req = rmsgp;
+	return hdr_len;
+}
+
+int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *rqstp)
+{
+	struct rpcrdma_msg *rmsgp = NULL;
+	struct rpcrdma_read_chunk *ch;
+	struct rpcrdma_write_array *ary;
+	u32 *va;
+	u32 hdrlen;
+
+	dprintk("svcrdma: processing deferred RDMA header on rqstp=%p\n",
+		rqstp);
+	rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
+
+	/* Pull in the extra for the padded case and bump our pointer */
+	if (rmsgp->rm_type == RDMA_MSGP) {
+		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
+		rqstp->rq_arg.head[0].iov_base = va;
+		hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
+		rqstp->rq_arg.head[0].iov_len -= hdrlen;
+		return hdrlen;
+	}
+
+	/*
+	 * Skip all chunks to find RPC msg. These were previously processed
+	 */
+	va = &rmsgp->rm_body.rm_chunks[0];
+
+	/* Skip read-list */
+	for (ch = (struct rpcrdma_read_chunk *)va;
+	     ch->rc_discrim != xdr_zero; ch++);
+	va = (u32 *)&ch->rc_position;
+
+	/* Skip write-list */
+	ary = (struct rpcrdma_write_array *)va;
+	if (ary->wc_discrim == xdr_zero)
+		va = (u32 *)&ary->wc_nchunks;
+	else
+		/*
+		 * rs_length is the 2nd 4B field in wc_target and taking its
+		 * address skips the list terminator
+		 */
+		va = (u32 *)&ary->wc_array[ary->wc_nchunks].wc_target.rs_length;
+
+	/* Skip reply-array */
+	ary = (struct rpcrdma_write_array *)va;
+	if (ary->wc_discrim == xdr_zero)
+		va = (u32 *)&ary->wc_nchunks;
+	else
+		va = (u32 *)&ary->wc_array[ary->wc_nchunks];
+
+	rqstp->rq_arg.head[0].iov_base = va;
+	hdrlen = (unsigned long)va - (unsigned long)rmsgp;
+	rqstp->rq_arg.head[0].iov_len -= hdrlen;
+
+	return hdrlen;
+}
+
+int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
+			      struct rpcrdma_msg *rmsgp,
+			      enum rpcrdma_errcode err, u32 *va)
+{
+	u32 *startp = va;
+
+	*va++ = htonl(rmsgp->rm_xid);
+	*va++ = htonl(rmsgp->rm_vers);
+	*va++ = htonl(xprt->sc_max_requests);
+	*va++ = htonl(RDMA_ERROR);
+	*va++ = htonl(err);
+	if (err == ERR_VERS) {
+		*va++ = htonl(RPCRDMA_VERSION);
+		*va++ = htonl(RPCRDMA_VERSION);
+	}
+
+	return (int)((unsigned long)va - (unsigned long)startp);
+}
+
+int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
+{
+	struct rpcrdma_write_array *wr_ary;
+
+	/* There is no read-list in a reply */
+
+	/* skip write list */
+	wr_ary = (struct rpcrdma_write_array *)
+		&rmsgp->rm_body.rm_chunks[1];
+	if (wr_ary->wc_discrim)
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_array[ntohl(wr_ary->wc_nchunks)].
+			wc_target.rs_length;
+	else
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_nchunks;
+
+	/* skip reply array */
+	if (wr_ary->wc_discrim)
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_array[ntohl(wr_ary->wc_nchunks)];
+	else
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_nchunks;
+
+	return (unsigned long) wr_ary - (unsigned long) rmsgp;
+}
+
+void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
+{
+	struct rpcrdma_write_array *ary;
+
+	/* no read-list */
+	rmsgp->rm_body.rm_chunks[0] = xdr_zero;
+
+	/* write-array discrim */
+	ary = (struct rpcrdma_write_array *)
+		&rmsgp->rm_body.rm_chunks[1];
+	ary->wc_discrim = xdr_one;
+	ary->wc_nchunks = htonl(chunks);
+
+	/* write-list terminator */
+	ary->wc_array[chunks].wc_target.rs_handle = xdr_zero;
+
+	/* reply-array discriminator */
+	ary->wc_array[chunks].wc_target.rs_length = xdr_zero;
+}
+
+void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *ary,
+				 int chunks)
+{
+	ary->wc_discrim = xdr_one;
+	ary->wc_nchunks = htonl(chunks);
+}
+
+void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
+				     int chunk_no,
+				     __be32 rs_handle,
+				     __be64 rs_offset,
+				     u32 write_len)
+{
+	struct rpcrdma_segment *seg = &ary->wc_array[chunk_no].wc_target;
+	seg->rs_handle = rs_handle;
+	seg->rs_offset = rs_offset;
+	seg->rs_length = htonl(write_len);
+}
+
+void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
+				  struct rpcrdma_msg *rdma_argp,
+				  struct rpcrdma_msg *rdma_resp,
+				  enum rpcrdma_proc rdma_type)
+{
+	rdma_resp->rm_xid = htonl(rdma_argp->rm_xid);
+	rdma_resp->rm_vers = htonl(rdma_argp->rm_vers);
+	rdma_resp->rm_credit = htonl(xprt->sc_max_requests);
+	rdma_resp->rm_type = htonl(rdma_type);
+
+	/* Encode <nul> chunks lists */
+	rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
+	rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
+	rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
+}
diff --git a/kernel/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/kernel/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
new file mode 100644
index 000000000..f9f13a32d
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -0,0 +1,672 @@
+/*
+ * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <asm/unaligned.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/*
+ * Replace the pages in the rq_argpages array with the pages from the SGE in
+ * the RDMA_RECV completion. The SGL should contain full pages up until the
+ * last one.
+ */
+static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
+			       struct svc_rdma_op_ctxt *ctxt,
+			       u32 byte_count)
+{
+	struct rpcrdma_msg *rmsgp;
+	struct page *page;
+	u32 bc;
+	int sge_no;
+
+	/* Swap the page in the SGE with the page in argpages */
+	page = ctxt->pages[0];
+	put_page(rqstp->rq_pages[0]);
+	rqstp->rq_pages[0] = page;
+
+	/* Set up the XDR head */
+	rqstp->rq_arg.head[0].iov_base = page_address(page);
+	rqstp->rq_arg.head[0].iov_len =
+		min_t(size_t, byte_count, ctxt->sge[0].length);
+	rqstp->rq_arg.len = byte_count;
+	rqstp->rq_arg.buflen = byte_count;
+
+	/* Compute bytes past head in the SGL */
+	bc = byte_count - rqstp->rq_arg.head[0].iov_len;
+
+	/* If data remains, store it in the pagelist */
+	rqstp->rq_arg.page_len = bc;
+	rqstp->rq_arg.page_base = 0;
+
+	/* RDMA_NOMSG: RDMA READ data should land just after RDMA RECV data */
+	rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
+	if (be32_to_cpu(rmsgp->rm_type) == RDMA_NOMSG)
+		rqstp->rq_arg.pages = &rqstp->rq_pages[0];
+	else
+		rqstp->rq_arg.pages = &rqstp->rq_pages[1];
+
+	sge_no = 1;
+	while (bc && sge_no < ctxt->count) {
+		page = ctxt->pages[sge_no];
+		put_page(rqstp->rq_pages[sge_no]);
+		rqstp->rq_pages[sge_no] = page;
+		bc -= min_t(u32, bc, ctxt->sge[sge_no].length);
+		rqstp->rq_arg.buflen += ctxt->sge[sge_no].length;
+		sge_no++;
+	}
+	rqstp->rq_respages = &rqstp->rq_pages[sge_no];
+	rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+	/* If not all pages were used from the SGL, free the remaining ones */
+	bc = sge_no;
+	while (sge_no < ctxt->count) {
+		page = ctxt->pages[sge_no++];
+		put_page(page);
+	}
+	ctxt->count = bc;
+
+	/* Set up tail */
+	rqstp->rq_arg.tail[0].iov_base = NULL;
+	rqstp->rq_arg.tail[0].iov_len = 0;
+}
+
+static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
+{
+	if (rdma_node_get_transport(xprt->sc_cm_id->device->node_type) ==
+	     RDMA_TRANSPORT_IWARP)
+		return 1;
+	else
+		return min_t(int, sge_count, xprt->sc_max_sge);
+}
+
+/* Issue an RDMA_READ using the local lkey to map the data sink */
+int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
+			struct svc_rqst *rqstp,
+			struct svc_rdma_op_ctxt *head,
+			int *page_no,
+			u32 *page_offset,
+			u32 rs_handle,
+			u32 rs_length,
+			u64 rs_offset,
+			bool last)
+{
+	struct ib_send_wr read_wr;
+	int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
+	struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
+	int ret, read, pno;
+	u32 pg_off = *page_offset;
+	u32 pg_no = *page_no;
+
+	ctxt->direction = DMA_FROM_DEVICE;
+	ctxt->read_hdr = head;
+	pages_needed =
+		min_t(int, pages_needed, rdma_read_max_sge(xprt, pages_needed));
+	read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
+
+	for (pno = 0; pno < pages_needed; pno++) {
+		int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
+
+		head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
+		head->arg.page_len += len;
+		head->arg.len += len;
+		if (!pg_off)
+			head->count++;
+		rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
+		rqstp->rq_next_page = rqstp->rq_respages + 1;
+		ctxt->sge[pno].addr =
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					head->arg.pages[pg_no], pg_off,
+					PAGE_SIZE - pg_off,
+					DMA_FROM_DEVICE);
+		ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
+					   ctxt->sge[pno].addr);
+		if (ret)
+			goto err;
+		atomic_inc(&xprt->sc_dma_used);
+
+		/* The lkey here is either a local dma lkey or a dma_mr lkey */
+		ctxt->sge[pno].lkey = xprt->sc_dma_lkey;
+		ctxt->sge[pno].length = len;
+		ctxt->count++;
+
+		/* adjust offset and wrap to next page if needed */
+		pg_off += len;
+		if (pg_off == PAGE_SIZE) {
+			pg_off = 0;
+			pg_no++;
+		}
+		rs_length -= len;
+	}
+
+	if (last && rs_length == 0)
+		set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+	else
+		clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+
+	memset(&read_wr, 0, sizeof(read_wr));
+	read_wr.wr_id = (unsigned long)ctxt;
+	read_wr.opcode = IB_WR_RDMA_READ;
+	ctxt->wr_op = read_wr.opcode;
+	read_wr.send_flags = IB_SEND_SIGNALED;
+	read_wr.wr.rdma.rkey = rs_handle;
+	read_wr.wr.rdma.remote_addr = rs_offset;
+	read_wr.sg_list = ctxt->sge;
+	read_wr.num_sge = pages_needed;
+
+	ret = svc_rdma_send(xprt, &read_wr);
+	if (ret) {
+		pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
+		set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+		goto err;
+	}
+
+	/* return current location in page array */
+	*page_no = pg_no;
+	*page_offset = pg_off;
+	ret = read;
+	atomic_inc(&rdma_stat_read);
+	return ret;
+ err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_context(ctxt, 0);
+	return ret;
+}
+
+/* Issue an RDMA_READ using an FRMR to map the data sink */
+int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
+			 struct svc_rqst *rqstp,
+			 struct svc_rdma_op_ctxt *head,
+			 int *page_no,
+			 u32 *page_offset,
+			 u32 rs_handle,
+			 u32 rs_length,
+			 u64 rs_offset,
+			 bool last)
+{
+	struct ib_send_wr read_wr;
+	struct ib_send_wr inv_wr;
+	struct ib_send_wr fastreg_wr;
+	u8 key;
+	int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
+	struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
+	struct svc_rdma_fastreg_mr *frmr = svc_rdma_get_frmr(xprt);
+	int ret, read, pno;
+	u32 pg_off = *page_offset;
+	u32 pg_no = *page_no;
+
+	if (IS_ERR(frmr))
+		return -ENOMEM;
+
+	ctxt->direction = DMA_FROM_DEVICE;
+	ctxt->frmr = frmr;
+	pages_needed = min_t(int, pages_needed, xprt->sc_frmr_pg_list_len);
+	read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
+
+	frmr->kva = page_address(rqstp->rq_arg.pages[pg_no]);
+	frmr->direction = DMA_FROM_DEVICE;
+	frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
+	frmr->map_len = pages_needed << PAGE_SHIFT;
+	frmr->page_list_len = pages_needed;
+
+	for (pno = 0; pno < pages_needed; pno++) {
+		int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
+
+		head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
+		head->arg.page_len += len;
+		head->arg.len += len;
+		if (!pg_off)
+			head->count++;
+		rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
+		rqstp->rq_next_page = rqstp->rq_respages + 1;
+		frmr->page_list->page_list[pno] =
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					head->arg.pages[pg_no], 0,
+					PAGE_SIZE, DMA_FROM_DEVICE);
+		ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
+					   frmr->page_list->page_list[pno]);
+		if (ret)
+			goto err;
+		atomic_inc(&xprt->sc_dma_used);
+
+		/* adjust offset and wrap to next page if needed */
+		pg_off += len;
+		if (pg_off == PAGE_SIZE) {
+			pg_off = 0;
+			pg_no++;
+		}
+		rs_length -= len;
+	}
+
+	if (last && rs_length == 0)
+		set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+	else
+		clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+
+	/* Bump the key */
+	key = (u8)(frmr->mr->lkey & 0x000000FF);
+	ib_update_fast_reg_key(frmr->mr, ++key);
+
+	ctxt->sge[0].addr = (unsigned long)frmr->kva + *page_offset;
+	ctxt->sge[0].lkey = frmr->mr->lkey;
+	ctxt->sge[0].length = read;
+	ctxt->count = 1;
+	ctxt->read_hdr = head;
+
+	/* Prepare FASTREG WR */
+	memset(&fastreg_wr, 0, sizeof(fastreg_wr));
+	fastreg_wr.opcode = IB_WR_FAST_REG_MR;
+	fastreg_wr.send_flags = IB_SEND_SIGNALED;
+	fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
+	fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
+	fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
+	fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
+	fastreg_wr.wr.fast_reg.length = frmr->map_len;
+	fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
+	fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
+	fastreg_wr.next = &read_wr;
+
+	/* Prepare RDMA_READ */
+	memset(&read_wr, 0, sizeof(read_wr));
+	read_wr.send_flags = IB_SEND_SIGNALED;
+	read_wr.wr.rdma.rkey = rs_handle;
+	read_wr.wr.rdma.remote_addr = rs_offset;
+	read_wr.sg_list = ctxt->sge;
+	read_wr.num_sge = 1;
+	if (xprt->sc_dev_caps & SVCRDMA_DEVCAP_READ_W_INV) {
+		read_wr.opcode = IB_WR_RDMA_READ_WITH_INV;
+		read_wr.wr_id = (unsigned long)ctxt;
+		read_wr.ex.invalidate_rkey = ctxt->frmr->mr->lkey;
+	} else {
+		read_wr.opcode = IB_WR_RDMA_READ;
+		read_wr.next = &inv_wr;
+		/* Prepare invalidate */
+		memset(&inv_wr, 0, sizeof(inv_wr));
+		inv_wr.wr_id = (unsigned long)ctxt;
+		inv_wr.opcode = IB_WR_LOCAL_INV;
+		inv_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_FENCE;
+		inv_wr.ex.invalidate_rkey = frmr->mr->lkey;
+	}
+	ctxt->wr_op = read_wr.opcode;
+
+	/* Post the chain */
+	ret = svc_rdma_send(xprt, &fastreg_wr);
+	if (ret) {
+		pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
+		set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+		goto err;
+	}
+
+	/* return current location in page array */
+	*page_no = pg_no;
+	*page_offset = pg_off;
+	ret = read;
+	atomic_inc(&rdma_stat_read);
+	return ret;
+ err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_context(ctxt, 0);
+	svc_rdma_put_frmr(xprt, frmr);
+	return ret;
+}
+
+static unsigned int
+rdma_rcl_chunk_count(struct rpcrdma_read_chunk *ch)
+{
+	unsigned int count;
+
+	for (count = 0; ch->rc_discrim != xdr_zero; ch++)
+		count++;
+	return count;
+}
+
+/* If there was additional inline content, append it to the end of arg.pages.
+ * Tail copy has to be done after the reader function has determined how many
+ * pages are needed for RDMA READ.
+ */
+static int
+rdma_copy_tail(struct svc_rqst *rqstp, struct svc_rdma_op_ctxt *head,
+	       u32 position, u32 byte_count, u32 page_offset, int page_no)
+{
+	char *srcp, *destp;
+	int ret;
+
+	ret = 0;
+	srcp = head->arg.head[0].iov_base + position;
+	byte_count = head->arg.head[0].iov_len - position;
+	if (byte_count > PAGE_SIZE) {
+		dprintk("svcrdma: large tail unsupported\n");
+		return 0;
+	}
+
+	/* Fit as much of the tail on the current page as possible */
+	if (page_offset != PAGE_SIZE) {
+		destp = page_address(rqstp->rq_arg.pages[page_no]);
+		destp += page_offset;
+		while (byte_count--) {
+			*destp++ = *srcp++;
+			page_offset++;
+			if (page_offset == PAGE_SIZE && byte_count)
+				goto more;
+		}
+		goto done;
+	}
+
+more:
+	/* Fit the rest on the next page */
+	page_no++;
+	destp = page_address(rqstp->rq_arg.pages[page_no]);
+	while (byte_count--)
+		*destp++ = *srcp++;
+
+	rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
+	rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+done:
+	byte_count = head->arg.head[0].iov_len - position;
+	head->arg.page_len += byte_count;
+	head->arg.len += byte_count;
+	head->arg.buflen += byte_count;
+	return 1;
+}
+
+static int rdma_read_chunks(struct svcxprt_rdma *xprt,
+			    struct rpcrdma_msg *rmsgp,
+			    struct svc_rqst *rqstp,
+			    struct svc_rdma_op_ctxt *head)
+{
+	int page_no, ret;
+	struct rpcrdma_read_chunk *ch;
+	u32 handle, page_offset, byte_count;
+	u32 position;
+	u64 rs_offset;
+	bool last;
+
+	/* If no read list is present, return 0 */
+	ch = svc_rdma_get_read_chunk(rmsgp);
+	if (!ch)
+		return 0;
+
+	if (rdma_rcl_chunk_count(ch) > RPCSVC_MAXPAGES)
+		return -EINVAL;
+
+	/* The request is completed when the RDMA_READs complete. The
+	 * head context keeps all the pages that comprise the
+	 * request.
+	 */
+	head->arg.head[0] = rqstp->rq_arg.head[0];
+	head->arg.tail[0] = rqstp->rq_arg.tail[0];
+	head->hdr_count = head->count;
+	head->arg.page_base = 0;
+	head->arg.page_len = 0;
+	head->arg.len = rqstp->rq_arg.len;
+	head->arg.buflen = rqstp->rq_arg.buflen;
+
+	ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+	position = be32_to_cpu(ch->rc_position);
+
+	/* RDMA_NOMSG: RDMA READ data should land just after RDMA RECV data */
+	if (position == 0) {
+		head->arg.pages = &head->pages[0];
+		page_offset = head->byte_len;
+	} else {
+		head->arg.pages = &head->pages[head->count];
+		page_offset = 0;
+	}
+
+	ret = 0;
+	page_no = 0;
+	for (; ch->rc_discrim != xdr_zero; ch++) {
+		if (be32_to_cpu(ch->rc_position) != position)
+			goto err;
+
+		handle = be32_to_cpu(ch->rc_target.rs_handle),
+		byte_count = be32_to_cpu(ch->rc_target.rs_length);
+		xdr_decode_hyper((__be32 *)&ch->rc_target.rs_offset,
+				 &rs_offset);
+
+		while (byte_count > 0) {
+			last = (ch + 1)->rc_discrim == xdr_zero;
+			ret = xprt->sc_reader(xprt, rqstp, head,
+					      &page_no, &page_offset,
+					      handle, byte_count,
+					      rs_offset, last);
+			if (ret < 0)
+				goto err;
+			byte_count -= ret;
+			rs_offset += ret;
+			head->arg.buflen += ret;
+		}
+	}
+
+	/* Read list may need XDR round-up (see RFC 5666, s. 3.7) */
+	if (page_offset & 3) {
+		u32 pad = 4 - (page_offset & 3);
+
+		head->arg.page_len += pad;
+		head->arg.len += pad;
+		head->arg.buflen += pad;
+		page_offset += pad;
+	}
+
+	ret = 1;
+	if (position && position < head->arg.head[0].iov_len)
+		ret = rdma_copy_tail(rqstp, head, position,
+				     byte_count, page_offset, page_no);
+	head->arg.head[0].iov_len = position;
+	head->position = position;
+
+ err:
+	/* Detach arg pages. svc_recv will replenish them */
+	for (page_no = 0;
+	     &rqstp->rq_pages[page_no] < rqstp->rq_respages; page_no++)
+		rqstp->rq_pages[page_no] = NULL;
+
+	return ret;
+}
+
+static int rdma_read_complete(struct svc_rqst *rqstp,
+			      struct svc_rdma_op_ctxt *head)
+{
+	int page_no;
+	int ret;
+
+	/* Copy RPC pages */
+	for (page_no = 0; page_no < head->count; page_no++) {
+		put_page(rqstp->rq_pages[page_no]);
+		rqstp->rq_pages[page_no] = head->pages[page_no];
+	}
+
+	/* Adjustments made for RDMA_NOMSG type requests */
+	if (head->position == 0) {
+		if (head->arg.len <= head->sge[0].length) {
+			head->arg.head[0].iov_len = head->arg.len -
+							head->byte_len;
+			head->arg.page_len = 0;
+		} else {
+			head->arg.head[0].iov_len = head->sge[0].length -
+								head->byte_len;
+			head->arg.page_len = head->arg.len -
+						head->sge[0].length;
+		}
+	}
+
+	/* Point rq_arg.pages past header */
+	rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count];
+	rqstp->rq_arg.page_len = head->arg.page_len;
+	rqstp->rq_arg.page_base = head->arg.page_base;
+
+	/* rq_respages starts after the last arg page */
+	rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
+	rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+	/* Rebuild rq_arg head and tail. */
+	rqstp->rq_arg.head[0] = head->arg.head[0];
+	rqstp->rq_arg.tail[0] = head->arg.tail[0];
+	rqstp->rq_arg.len = head->arg.len;
+	rqstp->rq_arg.buflen = head->arg.buflen;
+
+	/* Free the context */
+	svc_rdma_put_context(head, 0);
+
+	/* XXX: What should this be? */
+	rqstp->rq_prot = IPPROTO_MAX;
+	svc_xprt_copy_addrs(rqstp, rqstp->rq_xprt);
+
+	ret = rqstp->rq_arg.head[0].iov_len
+		+ rqstp->rq_arg.page_len
+		+ rqstp->rq_arg.tail[0].iov_len;
+	dprintk("svcrdma: deferred read ret=%d, rq_arg.len=%u, "
+		"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len=%zu\n",
+		ret, rqstp->rq_arg.len,	rqstp->rq_arg.head[0].iov_base,
+		rqstp->rq_arg.head[0].iov_len);
+
+	return ret;
+}
+
+/*
+ * Set up the rqstp thread context to point to the RQ buffer. If
+ * necessary, pull additional data from the client with an RDMA_READ
+ * request.
+ */
+int svc_rdma_recvfrom(struct svc_rqst *rqstp)
+{
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct svcxprt_rdma *rdma_xprt =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+	struct rpcrdma_msg *rmsgp;
+	int ret = 0;
+	int len;
+
+	dprintk("svcrdma: rqstp=%p\n", rqstp);
+
+	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
+	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
+		ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+		spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+		return rdma_read_complete(rqstp, ctxt);
+	} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
+		ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+	} else {
+		atomic_inc(&rdma_stat_rq_starve);
+		clear_bit(XPT_DATA, &xprt->xpt_flags);
+		ctxt = NULL;
+	}
+	spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+	if (!ctxt) {
+		/* This is the EAGAIN path. The svc_recv routine will
+		 * return -EAGAIN, the nfsd thread will go to call into
+		 * svc_recv again and we shouldn't be on the active
+		 * transport list
+		 */
+		if (test_bit(XPT_CLOSE, &xprt->xpt_flags))
+			goto close_out;
+
+		goto out;
+	}
+	dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p, status=%d\n",
+		ctxt, rdma_xprt, rqstp, ctxt->wc_status);
+	atomic_inc(&rdma_stat_recv);
+
+	/* Build up the XDR from the receive buffers. */
+	rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len);
+
+	/* Decode the RDMA header. */
+	len = svc_rdma_xdr_decode_req(&rmsgp, rqstp);
+	rqstp->rq_xprt_hlen = len;
+
+	/* If the request is invalid, reply with an error */
+	if (len < 0) {
+		if (len == -ENOSYS)
+			svc_rdma_send_error(rdma_xprt, rmsgp, ERR_VERS);
+		goto close_out;
+	}
+
+	/* Read read-list data. */
+	ret = rdma_read_chunks(rdma_xprt, rmsgp, rqstp, ctxt);
+	if (ret > 0) {
+		/* read-list posted, defer until data received from client. */
+		goto defer;
+	} else if (ret < 0) {
+		/* Post of read-list failed, free context. */
+		svc_rdma_put_context(ctxt, 1);
+		return 0;
+	}
+
+	ret = rqstp->rq_arg.head[0].iov_len
+		+ rqstp->rq_arg.page_len
+		+ rqstp->rq_arg.tail[0].iov_len;
+	svc_rdma_put_context(ctxt, 0);
+ out:
+	dprintk("svcrdma: ret=%d, rq_arg.len=%u, "
+		"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len=%zd\n",
+		ret, rqstp->rq_arg.len,
+		rqstp->rq_arg.head[0].iov_base,
+		rqstp->rq_arg.head[0].iov_len);
+	rqstp->rq_prot = IPPROTO_MAX;
+	svc_xprt_copy_addrs(rqstp, xprt);
+	return ret;
+
+ close_out:
+	if (ctxt)
+		svc_rdma_put_context(ctxt, 1);
+	dprintk("svcrdma: transport %p is closing\n", xprt);
+	/*
+	 * Set the close bit and enqueue it. svc_recv will see the
+	 * close bit and call svc_xprt_delete
+	 */
+	set_bit(XPT_CLOSE, &xprt->xpt_flags);
+defer:
+	return 0;
+}
diff --git a/kernel/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/kernel/net/sunrpc/xprtrdma/svc_rdma_sendto.c
new file mode 100644
index 000000000..7de33d1af
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -0,0 +1,560 @@
+/*
+ * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <asm/unaligned.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+static int map_xdr(struct svcxprt_rdma *xprt,
+		   struct xdr_buf *xdr,
+		   struct svc_rdma_req_map *vec)
+{
+	int sge_no;
+	u32 sge_bytes;
+	u32 page_bytes;
+	u32 page_off;
+	int page_no;
+
+	if (xdr->len !=
+	    (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len)) {
+		pr_err("svcrdma: map_xdr: XDR buffer length error\n");
+		return -EIO;
+	}
+
+	/* Skip the first sge, this is for the RPCRDMA header */
+	sge_no = 1;
+
+	/* Head SGE */
+	vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
+	vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
+	sge_no++;
+
+	/* pages SGE */
+	page_no = 0;
+	page_bytes = xdr->page_len;
+	page_off = xdr->page_base;
+	while (page_bytes) {
+		vec->sge[sge_no].iov_base =
+			page_address(xdr->pages[page_no]) + page_off;
+		sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
+		page_bytes -= sge_bytes;
+		vec->sge[sge_no].iov_len = sge_bytes;
+
+		sge_no++;
+		page_no++;
+		page_off = 0; /* reset for next time through loop */
+	}
+
+	/* Tail SGE */
+	if (xdr->tail[0].iov_len) {
+		vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
+		vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
+		sge_no++;
+	}
+
+	dprintk("svcrdma: map_xdr: sge_no %d page_no %d "
+		"page_base %u page_len %u head_len %zu tail_len %zu\n",
+		sge_no, page_no, xdr->page_base, xdr->page_len,
+		xdr->head[0].iov_len, xdr->tail[0].iov_len);
+
+	vec->count = sge_no;
+	return 0;
+}
+
+static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
+			      struct xdr_buf *xdr,
+			      u32 xdr_off, size_t len, int dir)
+{
+	struct page *page;
+	dma_addr_t dma_addr;
+	if (xdr_off < xdr->head[0].iov_len) {
+		/* This offset is in the head */
+		xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
+		page = virt_to_page(xdr->head[0].iov_base);
+	} else {
+		xdr_off -= xdr->head[0].iov_len;
+		if (xdr_off < xdr->page_len) {
+			/* This offset is in the page list */
+			xdr_off += xdr->page_base;
+			page = xdr->pages[xdr_off >> PAGE_SHIFT];
+			xdr_off &= ~PAGE_MASK;
+		} else {
+			/* This offset is in the tail */
+			xdr_off -= xdr->page_len;
+			xdr_off += (unsigned long)
+				xdr->tail[0].iov_base & ~PAGE_MASK;
+			page = virt_to_page(xdr->tail[0].iov_base);
+		}
+	}
+	dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off,
+				   min_t(size_t, PAGE_SIZE, len), dir);
+	return dma_addr;
+}
+
+/* Assumptions:
+ * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
+ */
+static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
+		      u32 rmr, u64 to,
+		      u32 xdr_off, int write_len,
+		      struct svc_rdma_req_map *vec)
+{
+	struct ib_send_wr write_wr;
+	struct ib_sge *sge;
+	int xdr_sge_no;
+	int sge_no;
+	int sge_bytes;
+	int sge_off;
+	int bc;
+	struct svc_rdma_op_ctxt *ctxt;
+
+	if (vec->count > RPCSVC_MAXPAGES) {
+		pr_err("svcrdma: Too many pages (%lu)\n", vec->count);
+		return -EIO;
+	}
+
+	dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
+		"write_len=%d, vec->sge=%p, vec->count=%lu\n",
+		rmr, (unsigned long long)to, xdr_off,
+		write_len, vec->sge, vec->count);
+
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->direction = DMA_TO_DEVICE;
+	sge = ctxt->sge;
+
+	/* Find the SGE associated with xdr_off */
+	for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
+	     xdr_sge_no++) {
+		if (vec->sge[xdr_sge_no].iov_len > bc)
+			break;
+		bc -= vec->sge[xdr_sge_no].iov_len;
+	}
+
+	sge_off = bc;
+	bc = write_len;
+	sge_no = 0;
+
+	/* Copy the remaining SGE */
+	while (bc != 0) {
+		sge_bytes = min_t(size_t,
+			  bc, vec->sge[xdr_sge_no].iov_len-sge_off);
+		sge[sge_no].length = sge_bytes;
+		sge[sge_no].addr =
+			dma_map_xdr(xprt, &rqstp->rq_res, xdr_off,
+				    sge_bytes, DMA_TO_DEVICE);
+		xdr_off += sge_bytes;
+		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
+					 sge[sge_no].addr))
+			goto err;
+		atomic_inc(&xprt->sc_dma_used);
+		sge[sge_no].lkey = xprt->sc_dma_lkey;
+		ctxt->count++;
+		sge_off = 0;
+		sge_no++;
+		xdr_sge_no++;
+		if (xdr_sge_no > vec->count) {
+			pr_err("svcrdma: Too many sges (%d)\n", xdr_sge_no);
+			goto err;
+		}
+		bc -= sge_bytes;
+		if (sge_no == xprt->sc_max_sge)
+			break;
+	}
+
+	/* Prepare WRITE WR */
+	memset(&write_wr, 0, sizeof write_wr);
+	ctxt->wr_op = IB_WR_RDMA_WRITE;
+	write_wr.wr_id = (unsigned long)ctxt;
+	write_wr.sg_list = &sge[0];
+	write_wr.num_sge = sge_no;
+	write_wr.opcode = IB_WR_RDMA_WRITE;
+	write_wr.send_flags = IB_SEND_SIGNALED;
+	write_wr.wr.rdma.rkey = rmr;
+	write_wr.wr.rdma.remote_addr = to;
+
+	/* Post It */
+	atomic_inc(&rdma_stat_write);
+	if (svc_rdma_send(xprt, &write_wr))
+		goto err;
+	return write_len - bc;
+ err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_context(ctxt, 0);
+	/* Fatal error, close transport */
+	return -EIO;
+}
+
+static int send_write_chunks(struct svcxprt_rdma *xprt,
+			     struct rpcrdma_msg *rdma_argp,
+			     struct rpcrdma_msg *rdma_resp,
+			     struct svc_rqst *rqstp,
+			     struct svc_rdma_req_map *vec)
+{
+	u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
+	int write_len;
+	u32 xdr_off;
+	int chunk_off;
+	int chunk_no;
+	struct rpcrdma_write_array *arg_ary;
+	struct rpcrdma_write_array *res_ary;
+	int ret;
+
+	arg_ary = svc_rdma_get_write_array(rdma_argp);
+	if (!arg_ary)
+		return 0;
+	res_ary = (struct rpcrdma_write_array *)
+		&rdma_resp->rm_body.rm_chunks[1];
+
+	/* Write chunks start at the pagelist */
+	for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
+	     xfer_len && chunk_no < arg_ary->wc_nchunks;
+	     chunk_no++) {
+		struct rpcrdma_segment *arg_ch;
+		u64 rs_offset;
+
+		arg_ch = &arg_ary->wc_array[chunk_no].wc_target;
+		write_len = min(xfer_len, ntohl(arg_ch->rs_length));
+
+		/* Prepare the response chunk given the length actually
+		 * written */
+		xdr_decode_hyper((__be32 *)&arg_ch->rs_offset, &rs_offset);
+		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
+						arg_ch->rs_handle,
+						arg_ch->rs_offset,
+						write_len);
+		chunk_off = 0;
+		while (write_len) {
+			ret = send_write(xprt, rqstp,
+					 ntohl(arg_ch->rs_handle),
+					 rs_offset + chunk_off,
+					 xdr_off,
+					 write_len,
+					 vec);
+			if (ret <= 0) {
+				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
+					ret);
+				return -EIO;
+			}
+			chunk_off += ret;
+			xdr_off += ret;
+			xfer_len -= ret;
+			write_len -= ret;
+		}
+	}
+	/* Update the req with the number of chunks actually used */
+	svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);
+
+	return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
+}
+
+static int send_reply_chunks(struct svcxprt_rdma *xprt,
+			     struct rpcrdma_msg *rdma_argp,
+			     struct rpcrdma_msg *rdma_resp,
+			     struct svc_rqst *rqstp,
+			     struct svc_rdma_req_map *vec)
+{
+	u32 xfer_len = rqstp->rq_res.len;
+	int write_len;
+	u32 xdr_off;
+	int chunk_no;
+	int chunk_off;
+	int nchunks;
+	struct rpcrdma_segment *ch;
+	struct rpcrdma_write_array *arg_ary;
+	struct rpcrdma_write_array *res_ary;
+	int ret;
+
+	arg_ary = svc_rdma_get_reply_array(rdma_argp);
+	if (!arg_ary)
+		return 0;
+	/* XXX: need to fix when reply lists occur with read-list and or
+	 * write-list */
+	res_ary = (struct rpcrdma_write_array *)
+		&rdma_resp->rm_body.rm_chunks[2];
+
+	/* xdr offset starts at RPC message */
+	nchunks = ntohl(arg_ary->wc_nchunks);
+	for (xdr_off = 0, chunk_no = 0;
+	     xfer_len && chunk_no < nchunks;
+	     chunk_no++) {
+		u64 rs_offset;
+		ch = &arg_ary->wc_array[chunk_no].wc_target;
+		write_len = min(xfer_len, htonl(ch->rs_length));
+
+		/* Prepare the reply chunk given the length actually
+		 * written */
+		xdr_decode_hyper((__be32 *)&ch->rs_offset, &rs_offset);
+		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
+						ch->rs_handle, ch->rs_offset,
+						write_len);
+		chunk_off = 0;
+		while (write_len) {
+			ret = send_write(xprt, rqstp,
+					 ntohl(ch->rs_handle),
+					 rs_offset + chunk_off,
+					 xdr_off,
+					 write_len,
+					 vec);
+			if (ret <= 0) {
+				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
+					ret);
+				return -EIO;
+			}
+			chunk_off += ret;
+			xdr_off += ret;
+			xfer_len -= ret;
+			write_len -= ret;
+		}
+	}
+	/* Update the req with the number of chunks actually used */
+	svc_rdma_xdr_encode_reply_array(res_ary, chunk_no);
+
+	return rqstp->rq_res.len;
+}
+
+/* This function prepares the portion of the RPCRDMA message to be
+ * sent in the RDMA_SEND. This function is called after data sent via
+ * RDMA has already been transmitted. There are three cases:
+ * - The RPCRDMA header, RPC header, and payload are all sent in a
+ *   single RDMA_SEND. This is the "inline" case.
+ * - The RPCRDMA header and some portion of the RPC header and data
+ *   are sent via this RDMA_SEND and another portion of the data is
+ *   sent via RDMA.
+ * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
+ *   header and data are all transmitted via RDMA.
+ * In all three cases, this function prepares the RPCRDMA header in
+ * sge[0], the 'type' parameter indicates the type to place in the
+ * RPCRDMA header, and the 'byte_count' field indicates how much of
+ * the XDR to include in this RDMA_SEND. NB: The offset of the payload
+ * to send is zero in the XDR.
+ */
+static int send_reply(struct svcxprt_rdma *rdma,
+		      struct svc_rqst *rqstp,
+		      struct page *page,
+		      struct rpcrdma_msg *rdma_resp,
+		      struct svc_rdma_op_ctxt *ctxt,
+		      struct svc_rdma_req_map *vec,
+		      int byte_count)
+{
+	struct ib_send_wr send_wr;
+	int sge_no;
+	int sge_bytes;
+	int page_no;
+	int pages;
+	int ret;
+
+	/* Post a recv buffer to handle another request. */
+	ret = svc_rdma_post_recv(rdma);
+	if (ret) {
+		printk(KERN_INFO
+		       "svcrdma: could not post a receive buffer, err=%d."
+		       "Closing transport %p.\n", ret, rdma);
+		set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
+		svc_rdma_put_context(ctxt, 0);
+		return -ENOTCONN;
+	}
+
+	/* Prepare the context */
+	ctxt->pages[0] = page;
+	ctxt->count = 1;
+
+	/* Prepare the SGE for the RPCRDMA Header */
+	ctxt->sge[0].lkey = rdma->sc_dma_lkey;
+	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
+	ctxt->sge[0].addr =
+	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
+			    ctxt->sge[0].length, DMA_TO_DEVICE);
+	if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
+		goto err;
+	atomic_inc(&rdma->sc_dma_used);
+
+	ctxt->direction = DMA_TO_DEVICE;
+
+	/* Map the payload indicated by 'byte_count' */
+	for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
+		int xdr_off = 0;
+		sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
+		byte_count -= sge_bytes;
+		ctxt->sge[sge_no].addr =
+			dma_map_xdr(rdma, &rqstp->rq_res, xdr_off,
+				    sge_bytes, DMA_TO_DEVICE);
+		xdr_off += sge_bytes;
+		if (ib_dma_mapping_error(rdma->sc_cm_id->device,
+					 ctxt->sge[sge_no].addr))
+			goto err;
+		atomic_inc(&rdma->sc_dma_used);
+		ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
+		ctxt->sge[sge_no].length = sge_bytes;
+	}
+	if (byte_count != 0) {
+		pr_err("svcrdma: Could not map %d bytes\n", byte_count);
+		goto err;
+	}
+
+	/* Save all respages in the ctxt and remove them from the
+	 * respages array. They are our pages until the I/O
+	 * completes.
+	 */
+	pages = rqstp->rq_next_page - rqstp->rq_respages;
+	for (page_no = 0; page_no < pages; page_no++) {
+		ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
+		ctxt->count++;
+		rqstp->rq_respages[page_no] = NULL;
+		/*
+		 * If there are more pages than SGE, terminate SGE
+		 * list so that svc_rdma_unmap_dma doesn't attempt to
+		 * unmap garbage.
+		 */
+		if (page_no+1 >= sge_no)
+			ctxt->sge[page_no+1].length = 0;
+	}
+	rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+	if (sge_no > rdma->sc_max_sge) {
+		pr_err("svcrdma: Too many sges (%d)\n", sge_no);
+		goto err;
+	}
+	memset(&send_wr, 0, sizeof send_wr);
+	ctxt->wr_op = IB_WR_SEND;
+	send_wr.wr_id = (unsigned long)ctxt;
+	send_wr.sg_list = ctxt->sge;
+	send_wr.num_sge = sge_no;
+	send_wr.opcode = IB_WR_SEND;
+	send_wr.send_flags =  IB_SEND_SIGNALED;
+
+	ret = svc_rdma_send(rdma, &send_wr);
+	if (ret)
+		goto err;
+
+	return 0;
+
+ err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_context(ctxt, 1);
+	return -EIO;
+}
+
+void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
+{
+}
+
+int svc_rdma_sendto(struct svc_rqst *rqstp)
+{
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	struct rpcrdma_msg *rdma_argp;
+	struct rpcrdma_msg *rdma_resp;
+	struct rpcrdma_write_array *reply_ary;
+	enum rpcrdma_proc reply_type;
+	int ret;
+	int inline_bytes;
+	struct page *res_page;
+	struct svc_rdma_op_ctxt *ctxt;
+	struct svc_rdma_req_map *vec;
+
+	dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
+
+	/* Get the RDMA request header. The receive logic always
+	 * places this at the start of page 0.
+	 */
+	rdma_argp = page_address(rqstp->rq_pages[0]);
+
+	/* Build an req vec for the XDR */
+	ctxt = svc_rdma_get_context(rdma);
+	ctxt->direction = DMA_TO_DEVICE;
+	vec = svc_rdma_get_req_map();
+	ret = map_xdr(rdma, &rqstp->rq_res, vec);
+	if (ret)
+		goto err0;
+	inline_bytes = rqstp->rq_res.len;
+
+	/* Create the RDMA response header */
+	res_page = svc_rdma_get_page();
+	rdma_resp = page_address(res_page);
+	reply_ary = svc_rdma_get_reply_array(rdma_argp);
+	if (reply_ary)
+		reply_type = RDMA_NOMSG;
+	else
+		reply_type = RDMA_MSG;
+	svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
+					 rdma_resp, reply_type);
+
+	/* Send any write-chunk data and build resp write-list */
+	ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
+				rqstp, vec);
+	if (ret < 0) {
+		printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
+		       ret);
+		goto err1;
+	}
+	inline_bytes -= ret;
+
+	/* Send any reply-list data and update resp reply-list */
+	ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
+				rqstp, vec);
+	if (ret < 0) {
+		printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
+		       ret);
+		goto err1;
+	}
+	inline_bytes -= ret;
+
+	ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec,
+			 inline_bytes);
+	svc_rdma_put_req_map(vec);
+	dprintk("svcrdma: send_reply returns %d\n", ret);
+	return ret;
+
+ err1:
+	put_page(res_page);
+ err0:
+	svc_rdma_put_req_map(vec);
+	svc_rdma_put_context(ctxt, 0);
+	return ret;
+}
diff --git a/kernel/net/sunrpc/xprtrdma/svc_rdma_transport.c b/kernel/net/sunrpc/xprtrdma/svc_rdma_transport.c
new file mode 100644
index 000000000..f609c1c2d
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -0,0 +1,1366 @@
+/*
+ * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
+ * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/sunrpc/svc_xprt.h>
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+#include <linux/export.h>
+#include "xprt_rdma.h"
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct net *net,
+					struct sockaddr *sa, int salen,
+					int flags);
+static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
+static void svc_rdma_release_rqst(struct svc_rqst *);
+static void dto_tasklet_func(unsigned long data);
+static void svc_rdma_detach(struct svc_xprt *xprt);
+static void svc_rdma_free(struct svc_xprt *xprt);
+static int svc_rdma_has_wspace(struct svc_xprt *xprt);
+static int svc_rdma_secure_port(struct svc_rqst *);
+static void rq_cq_reap(struct svcxprt_rdma *xprt);
+static void sq_cq_reap(struct svcxprt_rdma *xprt);
+
+static DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL);
+static DEFINE_SPINLOCK(dto_lock);
+static LIST_HEAD(dto_xprt_q);
+
+static struct svc_xprt_ops svc_rdma_ops = {
+	.xpo_create = svc_rdma_create,
+	.xpo_recvfrom = svc_rdma_recvfrom,
+	.xpo_sendto = svc_rdma_sendto,
+	.xpo_release_rqst = svc_rdma_release_rqst,
+	.xpo_detach = svc_rdma_detach,
+	.xpo_free = svc_rdma_free,
+	.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
+	.xpo_has_wspace = svc_rdma_has_wspace,
+	.xpo_accept = svc_rdma_accept,
+	.xpo_secure_port = svc_rdma_secure_port,
+};
+
+struct svc_xprt_class svc_rdma_class = {
+	.xcl_name = "rdma",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_rdma_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA,
+	.xcl_ident = XPRT_TRANSPORT_RDMA,
+};
+
+struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
+{
+	struct svc_rdma_op_ctxt *ctxt;
+
+	while (1) {
+		ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL);
+		if (ctxt)
+			break;
+		schedule_timeout_uninterruptible(msecs_to_jiffies(500));
+	}
+	ctxt->xprt = xprt;
+	INIT_LIST_HEAD(&ctxt->dto_q);
+	ctxt->count = 0;
+	ctxt->frmr = NULL;
+	atomic_inc(&xprt->sc_ctxt_used);
+	return ctxt;
+}
+
+void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
+{
+	struct svcxprt_rdma *xprt = ctxt->xprt;
+	int i;
+	for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
+		/*
+		 * Unmap the DMA addr in the SGE if the lkey matches
+		 * the sc_dma_lkey, otherwise, ignore it since it is
+		 * an FRMR lkey and will be unmapped later when the
+		 * last WR that uses it completes.
+		 */
+		if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) {
+			atomic_dec(&xprt->sc_dma_used);
+			ib_dma_unmap_page(xprt->sc_cm_id->device,
+					    ctxt->sge[i].addr,
+					    ctxt->sge[i].length,
+					    ctxt->direction);
+		}
+	}
+}
+
+void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
+{
+	struct svcxprt_rdma *xprt;
+	int i;
+
+	xprt = ctxt->xprt;
+	if (free_pages)
+		for (i = 0; i < ctxt->count; i++)
+			put_page(ctxt->pages[i]);
+
+	kmem_cache_free(svc_rdma_ctxt_cachep, ctxt);
+	atomic_dec(&xprt->sc_ctxt_used);
+}
+
+/*
+ * Temporary NFS req mappings are shared across all transport
+ * instances. These are short lived and should be bounded by the number
+ * of concurrent server threads * depth of the SQ.
+ */
+struct svc_rdma_req_map *svc_rdma_get_req_map(void)
+{
+	struct svc_rdma_req_map *map;
+	while (1) {
+		map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL);
+		if (map)
+			break;
+		schedule_timeout_uninterruptible(msecs_to_jiffies(500));
+	}
+	map->count = 0;
+	return map;
+}
+
+void svc_rdma_put_req_map(struct svc_rdma_req_map *map)
+{
+	kmem_cache_free(svc_rdma_map_cachep, map);
+}
+
+/* ib_cq event handler */
+static void cq_event_handler(struct ib_event *event, void *context)
+{
+	struct svc_xprt *xprt = context;
+	dprintk("svcrdma: received CQ event id=%d, context=%p\n",
+		event->event, context);
+	set_bit(XPT_CLOSE, &xprt->xpt_flags);
+}
+
+/* QP event handler */
+static void qp_event_handler(struct ib_event *event, void *context)
+{
+	struct svc_xprt *xprt = context;
+
+	switch (event->event) {
+	/* These are considered benign events */
+	case IB_EVENT_PATH_MIG:
+	case IB_EVENT_COMM_EST:
+	case IB_EVENT_SQ_DRAINED:
+	case IB_EVENT_QP_LAST_WQE_REACHED:
+		dprintk("svcrdma: QP event %d received for QP=%p\n",
+			event->event, event->element.qp);
+		break;
+	/* These are considered fatal events */
+	case IB_EVENT_PATH_MIG_ERR:
+	case IB_EVENT_QP_FATAL:
+	case IB_EVENT_QP_REQ_ERR:
+	case IB_EVENT_QP_ACCESS_ERR:
+	case IB_EVENT_DEVICE_FATAL:
+	default:
+		dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
+			"closing transport\n",
+			event->event, event->element.qp);
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		break;
+	}
+}
+
+/*
+ * Data Transfer Operation Tasklet
+ *
+ * Walks a list of transports with I/O pending, removing entries as
+ * they are added to the server's I/O pending list. Two bits indicate
+ * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
+ * spinlock that serializes access to the transport list with the RQ
+ * and SQ interrupt handlers.
+ */
+static void dto_tasklet_func(unsigned long data)
+{
+	struct svcxprt_rdma *xprt;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dto_lock, flags);
+	while (!list_empty(&dto_xprt_q)) {
+		xprt = list_entry(dto_xprt_q.next,
+				  struct svcxprt_rdma, sc_dto_q);
+		list_del_init(&xprt->sc_dto_q);
+		spin_unlock_irqrestore(&dto_lock, flags);
+
+		rq_cq_reap(xprt);
+		sq_cq_reap(xprt);
+
+		svc_xprt_put(&xprt->sc_xprt);
+		spin_lock_irqsave(&dto_lock, flags);
+	}
+	spin_unlock_irqrestore(&dto_lock, flags);
+}
+
+/*
+ * Receive Queue Completion Handler
+ *
+ * Since an RQ completion handler is called on interrupt context, we
+ * need to defer the handling of the I/O to a tasklet
+ */
+static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
+{
+	struct svcxprt_rdma *xprt = cq_context;
+	unsigned long flags;
+
+	/* Guard against unconditional flush call for destroyed QP */
+	if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
+		return;
+
+	/*
+	 * Set the bit regardless of whether or not it's on the list
+	 * because it may be on the list already due to an SQ
+	 * completion.
+	 */
+	set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags);
+
+	/*
+	 * If this transport is not already on the DTO transport queue,
+	 * add it
+	 */
+	spin_lock_irqsave(&dto_lock, flags);
+	if (list_empty(&xprt->sc_dto_q)) {
+		svc_xprt_get(&xprt->sc_xprt);
+		list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
+	}
+	spin_unlock_irqrestore(&dto_lock, flags);
+
+	/* Tasklet does all the work to avoid irqsave locks. */
+	tasklet_schedule(&dto_tasklet);
+}
+
+/*
+ * rq_cq_reap - Process the RQ CQ.
+ *
+ * Take all completing WC off the CQE and enqueue the associated DTO
+ * context on the dto_q for the transport.
+ *
+ * Note that caller must hold a transport reference.
+ */
+static void rq_cq_reap(struct svcxprt_rdma *xprt)
+{
+	int ret;
+	struct ib_wc wc;
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+
+	if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags))
+		return;
+
+	ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
+	atomic_inc(&rdma_stat_rq_poll);
+
+	while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
+		ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
+		ctxt->wc_status = wc.status;
+		ctxt->byte_len = wc.byte_len;
+		svc_rdma_unmap_dma(ctxt);
+		if (wc.status != IB_WC_SUCCESS) {
+			/* Close the transport */
+			dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt);
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			svc_rdma_put_context(ctxt, 1);
+			svc_xprt_put(&xprt->sc_xprt);
+			continue;
+		}
+		spin_lock_bh(&xprt->sc_rq_dto_lock);
+		list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
+		spin_unlock_bh(&xprt->sc_rq_dto_lock);
+		svc_xprt_put(&xprt->sc_xprt);
+	}
+
+	if (ctxt)
+		atomic_inc(&rdma_stat_rq_prod);
+
+	set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
+	/*
+	 * If data arrived before established event,
+	 * don't enqueue. This defers RPC I/O until the
+	 * RDMA connection is complete.
+	 */
+	if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
+		svc_xprt_enqueue(&xprt->sc_xprt);
+}
+
+/*
+ * Process a completion context
+ */
+static void process_context(struct svcxprt_rdma *xprt,
+			    struct svc_rdma_op_ctxt *ctxt)
+{
+	svc_rdma_unmap_dma(ctxt);
+
+	switch (ctxt->wr_op) {
+	case IB_WR_SEND:
+		if (ctxt->frmr)
+			pr_err("svcrdma: SEND: ctxt->frmr != NULL\n");
+		svc_rdma_put_context(ctxt, 1);
+		break;
+
+	case IB_WR_RDMA_WRITE:
+		if (ctxt->frmr)
+			pr_err("svcrdma: WRITE: ctxt->frmr != NULL\n");
+		svc_rdma_put_context(ctxt, 0);
+		break;
+
+	case IB_WR_RDMA_READ:
+	case IB_WR_RDMA_READ_WITH_INV:
+		svc_rdma_put_frmr(xprt, ctxt->frmr);
+		if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
+			struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
+			if (read_hdr) {
+				spin_lock_bh(&xprt->sc_rq_dto_lock);
+				set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
+				list_add_tail(&read_hdr->dto_q,
+					      &xprt->sc_read_complete_q);
+				spin_unlock_bh(&xprt->sc_rq_dto_lock);
+			} else {
+				pr_err("svcrdma: ctxt->read_hdr == NULL\n");
+			}
+			svc_xprt_enqueue(&xprt->sc_xprt);
+		}
+		svc_rdma_put_context(ctxt, 0);
+		break;
+
+	default:
+		printk(KERN_ERR "svcrdma: unexpected completion type, "
+		       "opcode=%d\n",
+		       ctxt->wr_op);
+		break;
+	}
+}
+
+/*
+ * Send Queue Completion Handler - potentially called on interrupt context.
+ *
+ * Note that caller must hold a transport reference.
+ */
+static void sq_cq_reap(struct svcxprt_rdma *xprt)
+{
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+	struct ib_wc wc_a[6];
+	struct ib_wc *wc;
+	struct ib_cq *cq = xprt->sc_sq_cq;
+	int ret;
+
+	memset(wc_a, 0, sizeof(wc_a));
+
+	if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags))
+		return;
+
+	ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
+	atomic_inc(&rdma_stat_sq_poll);
+	while ((ret = ib_poll_cq(cq, ARRAY_SIZE(wc_a), wc_a)) > 0) {
+		int i;
+
+		for (i = 0; i < ret; i++) {
+			wc = &wc_a[i];
+			if (wc->status != IB_WC_SUCCESS) {
+				dprintk("svcrdma: sq wc err status %d\n",
+					wc->status);
+
+				/* Close the transport */
+				set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			}
+
+			/* Decrement used SQ WR count */
+			atomic_dec(&xprt->sc_sq_count);
+			wake_up(&xprt->sc_send_wait);
+
+			ctxt = (struct svc_rdma_op_ctxt *)
+				(unsigned long)wc->wr_id;
+			if (ctxt)
+				process_context(xprt, ctxt);
+
+			svc_xprt_put(&xprt->sc_xprt);
+		}
+	}
+
+	if (ctxt)
+		atomic_inc(&rdma_stat_sq_prod);
+}
+
+static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
+{
+	struct svcxprt_rdma *xprt = cq_context;
+	unsigned long flags;
+
+	/* Guard against unconditional flush call for destroyed QP */
+	if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
+		return;
+
+	/*
+	 * Set the bit regardless of whether or not it's on the list
+	 * because it may be on the list already due to an RQ
+	 * completion.
+	 */
+	set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags);
+
+	/*
+	 * If this transport is not already on the DTO transport queue,
+	 * add it
+	 */
+	spin_lock_irqsave(&dto_lock, flags);
+	if (list_empty(&xprt->sc_dto_q)) {
+		svc_xprt_get(&xprt->sc_xprt);
+		list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
+	}
+	spin_unlock_irqrestore(&dto_lock, flags);
+
+	/* Tasklet does all the work to avoid irqsave locks. */
+	tasklet_schedule(&dto_tasklet);
+}
+
+static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
+					     int listener)
+{
+	struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
+
+	if (!cma_xprt)
+		return NULL;
+	svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
+	INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);
+	init_waitqueue_head(&cma_xprt->sc_send_wait);
+
+	spin_lock_init(&cma_xprt->sc_lock);
+	spin_lock_init(&cma_xprt->sc_rq_dto_lock);
+	spin_lock_init(&cma_xprt->sc_frmr_q_lock);
+
+	cma_xprt->sc_ord = svcrdma_ord;
+
+	cma_xprt->sc_max_req_size = svcrdma_max_req_size;
+	cma_xprt->sc_max_requests = svcrdma_max_requests;
+	cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
+	atomic_set(&cma_xprt->sc_sq_count, 0);
+	atomic_set(&cma_xprt->sc_ctxt_used, 0);
+
+	if (listener)
+		set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
+
+	return cma_xprt;
+}
+
+struct page *svc_rdma_get_page(void)
+{
+	struct page *page;
+
+	while ((page = alloc_page(GFP_KERNEL)) == NULL) {
+		/* If we can't get memory, wait a bit and try again */
+		printk(KERN_INFO "svcrdma: out of memory...retrying in 1s\n");
+		schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
+	}
+	return page;
+}
+
+int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
+{
+	struct ib_recv_wr recv_wr, *bad_recv_wr;
+	struct svc_rdma_op_ctxt *ctxt;
+	struct page *page;
+	dma_addr_t pa;
+	int sge_no;
+	int buflen;
+	int ret;
+
+	ctxt = svc_rdma_get_context(xprt);
+	buflen = 0;
+	ctxt->direction = DMA_FROM_DEVICE;
+	for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
+		if (sge_no >= xprt->sc_max_sge) {
+			pr_err("svcrdma: Too many sges (%d)\n", sge_no);
+			goto err_put_ctxt;
+		}
+		page = svc_rdma_get_page();
+		ctxt->pages[sge_no] = page;
+		pa = ib_dma_map_page(xprt->sc_cm_id->device,
+				     page, 0, PAGE_SIZE,
+				     DMA_FROM_DEVICE);
+		if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
+			goto err_put_ctxt;
+		atomic_inc(&xprt->sc_dma_used);
+		ctxt->sge[sge_no].addr = pa;
+		ctxt->sge[sge_no].length = PAGE_SIZE;
+		ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey;
+		ctxt->count = sge_no + 1;
+		buflen += PAGE_SIZE;
+	}
+	recv_wr.next = NULL;
+	recv_wr.sg_list = &ctxt->sge[0];
+	recv_wr.num_sge = ctxt->count;
+	recv_wr.wr_id = (u64)(unsigned long)ctxt;
+
+	svc_xprt_get(&xprt->sc_xprt);
+	ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
+	if (ret) {
+		svc_rdma_unmap_dma(ctxt);
+		svc_rdma_put_context(ctxt, 1);
+		svc_xprt_put(&xprt->sc_xprt);
+	}
+	return ret;
+
+ err_put_ctxt:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_context(ctxt, 1);
+	return -ENOMEM;
+}
+
+/*
+ * This function handles the CONNECT_REQUEST event on a listening
+ * endpoint. It is passed the cma_id for the _new_ connection. The context in
+ * this cma_id is inherited from the listening cma_id and is the svc_xprt
+ * structure for the listening endpoint.
+ *
+ * This function creates a new xprt for the new connection and enqueues it on
+ * the accept queue for the listent xprt. When the listen thread is kicked, it
+ * will call the recvfrom method on the listen xprt which will accept the new
+ * connection.
+ */
+static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
+{
+	struct svcxprt_rdma *listen_xprt = new_cma_id->context;
+	struct svcxprt_rdma *newxprt;
+	struct sockaddr *sa;
+
+	/* Create a new transport */
+	newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
+	if (!newxprt) {
+		dprintk("svcrdma: failed to create new transport\n");
+		return;
+	}
+	newxprt->sc_cm_id = new_cma_id;
+	new_cma_id->context = newxprt;
+	dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
+		newxprt, newxprt->sc_cm_id, listen_xprt);
+
+	/* Save client advertised inbound read limit for use later in accept. */
+	newxprt->sc_ord = client_ird;
+
+	/* Set the local and remote addresses in the transport */
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
+	svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
+	svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
+
+	/*
+	 * Enqueue the new transport on the accept queue of the listening
+	 * transport
+	 */
+	spin_lock_bh(&listen_xprt->sc_lock);
+	list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
+	spin_unlock_bh(&listen_xprt->sc_lock);
+
+	set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
+	svc_xprt_enqueue(&listen_xprt->sc_xprt);
+}
+
+/*
+ * Handles events generated on the listening endpoint. These events will be
+ * either be incoming connect requests or adapter removal  events.
+ */
+static int rdma_listen_handler(struct rdma_cm_id *cma_id,
+			       struct rdma_cm_event *event)
+{
+	struct svcxprt_rdma *xprt = cma_id->context;
+	int ret = 0;
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_CONNECT_REQUEST:
+		dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
+			"event=%d\n", cma_id, cma_id->context, event->event);
+		handle_connect_req(cma_id,
+				   event->param.conn.initiator_depth);
+		break;
+
+	case RDMA_CM_EVENT_ESTABLISHED:
+		/* Accept complete */
+		dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
+			"cm_id=%p\n", xprt, cma_id);
+		break;
+
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
+			xprt, cma_id);
+		if (xprt)
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+		break;
+
+	default:
+		dprintk("svcrdma: Unexpected event on listening endpoint %p, "
+			"event=%d\n", cma_id, event->event);
+		break;
+	}
+
+	return ret;
+}
+
+static int rdma_cma_handler(struct rdma_cm_id *cma_id,
+			    struct rdma_cm_event *event)
+{
+	struct svc_xprt *xprt = cma_id->context;
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	switch (event->event) {
+	case RDMA_CM_EVENT_ESTABLISHED:
+		/* Accept complete */
+		svc_xprt_get(xprt);
+		dprintk("svcrdma: Connection completed on DTO xprt=%p, "
+			"cm_id=%p\n", xprt, cma_id);
+		clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
+		svc_xprt_enqueue(xprt);
+		break;
+	case RDMA_CM_EVENT_DISCONNECTED:
+		dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
+			xprt, cma_id);
+		if (xprt) {
+			set_bit(XPT_CLOSE, &xprt->xpt_flags);
+			svc_xprt_enqueue(xprt);
+			svc_xprt_put(xprt);
+		}
+		break;
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
+			"event=%d\n", cma_id, xprt, event->event);
+		if (xprt) {
+			set_bit(XPT_CLOSE, &xprt->xpt_flags);
+			svc_xprt_enqueue(xprt);
+		}
+		break;
+	default:
+		dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
+			"event=%d\n", cma_id, event->event);
+		break;
+	}
+	return 0;
+}
+
+/*
+ * Create a listening RDMA service endpoint.
+ */
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct net *net,
+					struct sockaddr *sa, int salen,
+					int flags)
+{
+	struct rdma_cm_id *listen_id;
+	struct svcxprt_rdma *cma_xprt;
+	int ret;
+
+	dprintk("svcrdma: Creating RDMA socket\n");
+	if (sa->sa_family != AF_INET) {
+		dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family);
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+	cma_xprt = rdma_create_xprt(serv, 1);
+	if (!cma_xprt)
+		return ERR_PTR(-ENOMEM);
+
+	listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP,
+				   IB_QPT_RC);
+	if (IS_ERR(listen_id)) {
+		ret = PTR_ERR(listen_id);
+		dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
+		goto err0;
+	}
+
+	ret = rdma_bind_addr(listen_id, sa);
+	if (ret) {
+		dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
+		goto err1;
+	}
+	cma_xprt->sc_cm_id = listen_id;
+
+	ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
+	if (ret) {
+		dprintk("svcrdma: rdma_listen failed = %d\n", ret);
+		goto err1;
+	}
+
+	/*
+	 * We need to use the address from the cm_id in case the
+	 * caller specified 0 for the port number.
+	 */
+	sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
+	svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
+
+	return &cma_xprt->sc_xprt;
+
+ err1:
+	rdma_destroy_id(listen_id);
+ err0:
+	kfree(cma_xprt);
+	return ERR_PTR(ret);
+}
+
+static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
+{
+	struct ib_mr *mr;
+	struct ib_fast_reg_page_list *pl;
+	struct svc_rdma_fastreg_mr *frmr;
+
+	frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
+	if (!frmr)
+		goto err;
+
+	mr = ib_alloc_fast_reg_mr(xprt->sc_pd, RPCSVC_MAXPAGES);
+	if (IS_ERR(mr))
+		goto err_free_frmr;
+
+	pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device,
+					 RPCSVC_MAXPAGES);
+	if (IS_ERR(pl))
+		goto err_free_mr;
+
+	frmr->mr = mr;
+	frmr->page_list = pl;
+	INIT_LIST_HEAD(&frmr->frmr_list);
+	return frmr;
+
+ err_free_mr:
+	ib_dereg_mr(mr);
+ err_free_frmr:
+	kfree(frmr);
+ err:
+	return ERR_PTR(-ENOMEM);
+}
+
+static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
+{
+	struct svc_rdma_fastreg_mr *frmr;
+
+	while (!list_empty(&xprt->sc_frmr_q)) {
+		frmr = list_entry(xprt->sc_frmr_q.next,
+				  struct svc_rdma_fastreg_mr, frmr_list);
+		list_del_init(&frmr->frmr_list);
+		ib_dereg_mr(frmr->mr);
+		ib_free_fast_reg_page_list(frmr->page_list);
+		kfree(frmr);
+	}
+}
+
+struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
+{
+	struct svc_rdma_fastreg_mr *frmr = NULL;
+
+	spin_lock_bh(&rdma->sc_frmr_q_lock);
+	if (!list_empty(&rdma->sc_frmr_q)) {
+		frmr = list_entry(rdma->sc_frmr_q.next,
+				  struct svc_rdma_fastreg_mr, frmr_list);
+		list_del_init(&frmr->frmr_list);
+		frmr->map_len = 0;
+		frmr->page_list_len = 0;
+	}
+	spin_unlock_bh(&rdma->sc_frmr_q_lock);
+	if (frmr)
+		return frmr;
+
+	return rdma_alloc_frmr(rdma);
+}
+
+static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
+			   struct svc_rdma_fastreg_mr *frmr)
+{
+	int page_no;
+	for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
+		dma_addr_t addr = frmr->page_list->page_list[page_no];
+		if (ib_dma_mapping_error(frmr->mr->device, addr))
+			continue;
+		atomic_dec(&xprt->sc_dma_used);
+		ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
+				  frmr->direction);
+	}
+}
+
+void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
+		       struct svc_rdma_fastreg_mr *frmr)
+{
+	if (frmr) {
+		frmr_unmap_dma(rdma, frmr);
+		spin_lock_bh(&rdma->sc_frmr_q_lock);
+		WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
+		list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
+		spin_unlock_bh(&rdma->sc_frmr_q_lock);
+	}
+}
+
+/*
+ * This is the xpo_recvfrom function for listening endpoints. Its
+ * purpose is to accept incoming connections. The CMA callback handler
+ * has already created a new transport and attached it to the new CMA
+ * ID.
+ *
+ * There is a queue of pending connections hung on the listening
+ * transport. This queue contains the new svc_xprt structure. This
+ * function takes svc_xprt structures off the accept_q and completes
+ * the connection.
+ */
+static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *listen_rdma;
+	struct svcxprt_rdma *newxprt = NULL;
+	struct rdma_conn_param conn_param;
+	struct ib_qp_init_attr qp_attr;
+	struct ib_device_attr devattr;
+	int uninitialized_var(dma_mr_acc);
+	int need_dma_mr;
+	int ret;
+	int i;
+
+	listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	clear_bit(XPT_CONN, &xprt->xpt_flags);
+	/* Get the next entry off the accept list */
+	spin_lock_bh(&listen_rdma->sc_lock);
+	if (!list_empty(&listen_rdma->sc_accept_q)) {
+		newxprt = list_entry(listen_rdma->sc_accept_q.next,
+				     struct svcxprt_rdma, sc_accept_q);
+		list_del_init(&newxprt->sc_accept_q);
+	}
+	if (!list_empty(&listen_rdma->sc_accept_q))
+		set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
+	spin_unlock_bh(&listen_rdma->sc_lock);
+	if (!newxprt)
+		return NULL;
+
+	dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
+		newxprt, newxprt->sc_cm_id);
+
+	ret = ib_query_device(newxprt->sc_cm_id->device, &devattr);
+	if (ret) {
+		dprintk("svcrdma: could not query device attributes on "
+			"device %p, rc=%d\n", newxprt->sc_cm_id->device, ret);
+		goto errout;
+	}
+
+	/* Qualify the transport resource defaults with the
+	 * capabilities of this particular device */
+	newxprt->sc_max_sge = min((size_t)devattr.max_sge,
+				  (size_t)RPCSVC_MAXPAGES);
+	newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
+				   (size_t)svcrdma_max_requests);
+	newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
+
+	/*
+	 * Limit ORD based on client limit, local device limit, and
+	 * configured svcrdma limit.
+	 */
+	newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord);
+	newxprt->sc_ord = min_t(size_t,	svcrdma_ord, newxprt->sc_ord);
+
+	newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device);
+	if (IS_ERR(newxprt->sc_pd)) {
+		dprintk("svcrdma: error creating PD for connect request\n");
+		goto errout;
+	}
+	newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device,
+					 sq_comp_handler,
+					 cq_event_handler,
+					 newxprt,
+					 newxprt->sc_sq_depth,
+					 0);
+	if (IS_ERR(newxprt->sc_sq_cq)) {
+		dprintk("svcrdma: error creating SQ CQ for connect request\n");
+		goto errout;
+	}
+	newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device,
+					 rq_comp_handler,
+					 cq_event_handler,
+					 newxprt,
+					 newxprt->sc_max_requests,
+					 0);
+	if (IS_ERR(newxprt->sc_rq_cq)) {
+		dprintk("svcrdma: error creating RQ CQ for connect request\n");
+		goto errout;
+	}
+
+	memset(&qp_attr, 0, sizeof qp_attr);
+	qp_attr.event_handler = qp_event_handler;
+	qp_attr.qp_context = &newxprt->sc_xprt;
+	qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
+	qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
+	qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
+	qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
+	qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+	qp_attr.qp_type = IB_QPT_RC;
+	qp_attr.send_cq = newxprt->sc_sq_cq;
+	qp_attr.recv_cq = newxprt->sc_rq_cq;
+	dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
+		"    cm_id->device=%p, sc_pd->device=%p\n"
+		"    cap.max_send_wr = %d\n"
+		"    cap.max_recv_wr = %d\n"
+		"    cap.max_send_sge = %d\n"
+		"    cap.max_recv_sge = %d\n",
+		newxprt->sc_cm_id, newxprt->sc_pd,
+		newxprt->sc_cm_id->device, newxprt->sc_pd->device,
+		qp_attr.cap.max_send_wr,
+		qp_attr.cap.max_recv_wr,
+		qp_attr.cap.max_send_sge,
+		qp_attr.cap.max_recv_sge);
+
+	ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
+	if (ret) {
+		dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
+		goto errout;
+	}
+	newxprt->sc_qp = newxprt->sc_cm_id->qp;
+
+	/*
+	 * Use the most secure set of MR resources based on the
+	 * transport type and available memory management features in
+	 * the device. Here's the table implemented below:
+	 *
+	 *		Fast	Global	DMA	Remote WR
+	 *		Reg	LKEY	MR	Access
+	 *		Sup'd	Sup'd	Needed	Needed
+	 *
+	 * IWARP	N	N	Y	Y
+	 *		N	Y	Y	Y
+	 *		Y	N	Y	N
+	 *		Y	Y	N	-
+	 *
+	 * IB		N	N	Y	N
+	 *		N	Y	N	-
+	 *		Y	N	Y	N
+	 *		Y	Y	N	-
+	 *
+	 * NB:	iWARP requires remote write access for the data sink
+	 *	of an RDMA_READ. IB does not.
+	 */
+	newxprt->sc_reader = rdma_read_chunk_lcl;
+	if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
+		newxprt->sc_frmr_pg_list_len =
+			devattr.max_fast_reg_page_list_len;
+		newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
+		newxprt->sc_reader = rdma_read_chunk_frmr;
+	}
+
+	/*
+	 * Determine if a DMA MR is required and if so, what privs are required
+	 */
+	switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) {
+	case RDMA_TRANSPORT_IWARP:
+		newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
+		if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
+			need_dma_mr = 1;
+			dma_mr_acc =
+				(IB_ACCESS_LOCAL_WRITE |
+				 IB_ACCESS_REMOTE_WRITE);
+		} else if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) {
+			need_dma_mr = 1;
+			dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
+		} else
+			need_dma_mr = 0;
+		break;
+	case RDMA_TRANSPORT_IB:
+		if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
+			need_dma_mr = 1;
+			dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
+		} else if (!(devattr.device_cap_flags &
+			     IB_DEVICE_LOCAL_DMA_LKEY)) {
+			need_dma_mr = 1;
+			dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
+		} else
+			need_dma_mr = 0;
+		break;
+	default:
+		goto errout;
+	}
+
+	/* Create the DMA MR if needed, otherwise, use the DMA LKEY */
+	if (need_dma_mr) {
+		/* Register all of physical memory */
+		newxprt->sc_phys_mr =
+			ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc);
+		if (IS_ERR(newxprt->sc_phys_mr)) {
+			dprintk("svcrdma: Failed to create DMA MR ret=%d\n",
+				ret);
+			goto errout;
+		}
+		newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey;
+	} else
+		newxprt->sc_dma_lkey =
+			newxprt->sc_cm_id->device->local_dma_lkey;
+
+	/* Post receive buffers */
+	for (i = 0; i < newxprt->sc_max_requests; i++) {
+		ret = svc_rdma_post_recv(newxprt);
+		if (ret) {
+			dprintk("svcrdma: failure posting receive buffers\n");
+			goto errout;
+		}
+	}
+
+	/* Swap out the handler */
+	newxprt->sc_cm_id->event_handler = rdma_cma_handler;
+
+	/*
+	 * Arm the CQs for the SQ and RQ before accepting so we can't
+	 * miss the first message
+	 */
+	ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP);
+	ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP);
+
+	/* Accept Connection */
+	set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
+	memset(&conn_param, 0, sizeof conn_param);
+	conn_param.responder_resources = 0;
+	conn_param.initiator_depth = newxprt->sc_ord;
+	ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
+	if (ret) {
+		dprintk("svcrdma: failed to accept new connection, ret=%d\n",
+		       ret);
+		goto errout;
+	}
+
+	dprintk("svcrdma: new connection %p accepted with the following "
+		"attributes:\n"
+		"    local_ip        : %pI4\n"
+		"    local_port	     : %d\n"
+		"    remote_ip       : %pI4\n"
+		"    remote_port     : %d\n"
+		"    max_sge         : %d\n"
+		"    sq_depth        : %d\n"
+		"    max_requests    : %d\n"
+		"    ord             : %d\n",
+		newxprt,
+		&((struct sockaddr_in *)&newxprt->sc_cm_id->
+			 route.addr.src_addr)->sin_addr.s_addr,
+		ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
+		       route.addr.src_addr)->sin_port),
+		&((struct sockaddr_in *)&newxprt->sc_cm_id->
+			 route.addr.dst_addr)->sin_addr.s_addr,
+		ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
+		       route.addr.dst_addr)->sin_port),
+		newxprt->sc_max_sge,
+		newxprt->sc_sq_depth,
+		newxprt->sc_max_requests,
+		newxprt->sc_ord);
+
+	return &newxprt->sc_xprt;
+
+ errout:
+	dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
+	/* Take a reference in case the DTO handler runs */
+	svc_xprt_get(&newxprt->sc_xprt);
+	if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
+		ib_destroy_qp(newxprt->sc_qp);
+	rdma_destroy_id(newxprt->sc_cm_id);
+	/* This call to put will destroy the transport */
+	svc_xprt_put(&newxprt->sc_xprt);
+	return NULL;
+}
+
+static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
+{
+}
+
+/*
+ * When connected, an svc_xprt has at least two references:
+ *
+ * - A reference held by the cm_id between the ESTABLISHED and
+ *   DISCONNECTED events. If the remote peer disconnected first, this
+ *   reference could be gone.
+ *
+ * - A reference held by the svc_recv code that called this function
+ *   as part of close processing.
+ *
+ * At a minimum one references should still be held.
+ */
+static void svc_rdma_detach(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	dprintk("svc: svc_rdma_detach(%p)\n", xprt);
+
+	/* Disconnect and flush posted WQE */
+	rdma_disconnect(rdma->sc_cm_id);
+}
+
+static void __svc_rdma_free(struct work_struct *work)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(work, struct svcxprt_rdma, sc_work);
+	dprintk("svcrdma: svc_rdma_free(%p)\n", rdma);
+
+	/* We should only be called from kref_put */
+	if (atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0)
+		pr_err("svcrdma: sc_xprt still in use? (%d)\n",
+		       atomic_read(&rdma->sc_xprt.xpt_ref.refcount));
+
+	/*
+	 * Destroy queued, but not processed read completions. Note
+	 * that this cleanup has to be done before destroying the
+	 * cm_id because the device ptr is needed to unmap the dma in
+	 * svc_rdma_put_context.
+	 */
+	while (!list_empty(&rdma->sc_read_complete_q)) {
+		struct svc_rdma_op_ctxt *ctxt;
+		ctxt = list_entry(rdma->sc_read_complete_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+		svc_rdma_put_context(ctxt, 1);
+	}
+
+	/* Destroy queued, but not processed recv completions */
+	while (!list_empty(&rdma->sc_rq_dto_q)) {
+		struct svc_rdma_op_ctxt *ctxt;
+		ctxt = list_entry(rdma->sc_rq_dto_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+		svc_rdma_put_context(ctxt, 1);
+	}
+
+	/* Warn if we leaked a resource or under-referenced */
+	if (atomic_read(&rdma->sc_ctxt_used) != 0)
+		pr_err("svcrdma: ctxt still in use? (%d)\n",
+		       atomic_read(&rdma->sc_ctxt_used));
+	if (atomic_read(&rdma->sc_dma_used) != 0)
+		pr_err("svcrdma: dma still in use? (%d)\n",
+		       atomic_read(&rdma->sc_dma_used));
+
+	/* De-allocate fastreg mr */
+	rdma_dealloc_frmr_q(rdma);
+
+	/* Destroy the QP if present (not a listener) */
+	if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
+		ib_destroy_qp(rdma->sc_qp);
+
+	if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
+		ib_destroy_cq(rdma->sc_sq_cq);
+
+	if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
+		ib_destroy_cq(rdma->sc_rq_cq);
+
+	if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr))
+		ib_dereg_mr(rdma->sc_phys_mr);
+
+	if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
+		ib_dealloc_pd(rdma->sc_pd);
+
+	/* Destroy the CM ID */
+	rdma_destroy_id(rdma->sc_cm_id);
+
+	kfree(rdma);
+}
+
+static void svc_rdma_free(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	INIT_WORK(&rdma->sc_work, __svc_rdma_free);
+	queue_work(svc_rdma_wq, &rdma->sc_work);
+}
+
+static int svc_rdma_has_wspace(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+
+	/*
+	 * If there are already waiters on the SQ,
+	 * return false.
+	 */
+	if (waitqueue_active(&rdma->sc_send_wait))
+		return 0;
+
+	/* Otherwise return true. */
+	return 1;
+}
+
+static int svc_rdma_secure_port(struct svc_rqst *rqstp)
+{
+	return 1;
+}
+
+/*
+ * Attempt to register the kvec representing the RPC memory with the
+ * device.
+ *
+ * Returns:
+ *  NULL : The device does not support fastreg or there were no more
+ *         fastreg mr.
+ *  frmr : The kvec register request was successfully posted.
+ *    <0 : An error was encountered attempting to register the kvec.
+ */
+int svc_rdma_fastreg(struct svcxprt_rdma *xprt,
+		     struct svc_rdma_fastreg_mr *frmr)
+{
+	struct ib_send_wr fastreg_wr;
+	u8 key;
+
+	/* Bump the key */
+	key = (u8)(frmr->mr->lkey & 0x000000FF);
+	ib_update_fast_reg_key(frmr->mr, ++key);
+
+	/* Prepare FASTREG WR */
+	memset(&fastreg_wr, 0, sizeof fastreg_wr);
+	fastreg_wr.opcode = IB_WR_FAST_REG_MR;
+	fastreg_wr.send_flags = IB_SEND_SIGNALED;
+	fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
+	fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
+	fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
+	fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
+	fastreg_wr.wr.fast_reg.length = frmr->map_len;
+	fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
+	fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
+	return svc_rdma_send(xprt, &fastreg_wr);
+}
+
+int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
+{
+	struct ib_send_wr *bad_wr, *n_wr;
+	int wr_count;
+	int i;
+	int ret;
+
+	if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
+		return -ENOTCONN;
+
+	wr_count = 1;
+	for (n_wr = wr->next; n_wr; n_wr = n_wr->next)
+		wr_count++;
+
+	/* If the SQ is full, wait until an SQ entry is available */
+	while (1) {
+		spin_lock_bh(&xprt->sc_lock);
+		if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) {
+			spin_unlock_bh(&xprt->sc_lock);
+			atomic_inc(&rdma_stat_sq_starve);
+
+			/* See if we can opportunistically reap SQ WR to make room */
+			sq_cq_reap(xprt);
+
+			/* Wait until SQ WR available if SQ still full */
+			wait_event(xprt->sc_send_wait,
+				   atomic_read(&xprt->sc_sq_count) <
+				   xprt->sc_sq_depth);
+			if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
+				return -ENOTCONN;
+			continue;
+		}
+		/* Take a transport ref for each WR posted */
+		for (i = 0; i < wr_count; i++)
+			svc_xprt_get(&xprt->sc_xprt);
+
+		/* Bump used SQ WR count and post */
+		atomic_add(wr_count, &xprt->sc_sq_count);
+		ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
+		if (ret) {
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			atomic_sub(wr_count, &xprt->sc_sq_count);
+			for (i = 0; i < wr_count; i ++)
+				svc_xprt_put(&xprt->sc_xprt);
+			dprintk("svcrdma: failed to post SQ WR rc=%d, "
+			       "sc_sq_count=%d, sc_sq_depth=%d\n",
+			       ret, atomic_read(&xprt->sc_sq_count),
+			       xprt->sc_sq_depth);
+		}
+		spin_unlock_bh(&xprt->sc_lock);
+		if (ret)
+			wake_up(&xprt->sc_send_wait);
+		break;
+	}
+	return ret;
+}
+
+void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
+			 enum rpcrdma_errcode err)
+{
+	struct ib_send_wr err_wr;
+	struct page *p;
+	struct svc_rdma_op_ctxt *ctxt;
+	u32 *va;
+	int length;
+	int ret;
+
+	p = svc_rdma_get_page();
+	va = page_address(p);
+
+	/* XDR encode error */
+	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
+
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->direction = DMA_FROM_DEVICE;
+	ctxt->count = 1;
+	ctxt->pages[0] = p;
+
+	/* Prepare SGE for local address */
+	ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device,
+					    p, 0, length, DMA_FROM_DEVICE);
+	if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) {
+		put_page(p);
+		svc_rdma_put_context(ctxt, 1);
+		return;
+	}
+	atomic_inc(&xprt->sc_dma_used);
+	ctxt->sge[0].lkey = xprt->sc_dma_lkey;
+	ctxt->sge[0].length = length;
+
+	/* Prepare SEND WR */
+	memset(&err_wr, 0, sizeof err_wr);
+	ctxt->wr_op = IB_WR_SEND;
+	err_wr.wr_id = (unsigned long)ctxt;
+	err_wr.sg_list = ctxt->sge;
+	err_wr.num_sge = 1;
+	err_wr.opcode = IB_WR_SEND;
+	err_wr.send_flags = IB_SEND_SIGNALED;
+
+	/* Post It */
+	ret = svc_rdma_send(xprt, &err_wr);
+	if (ret) {
+		dprintk("svcrdma: Error %d posting send for protocol error\n",
+			ret);
+		svc_rdma_unmap_dma(ctxt);
+		svc_rdma_put_context(ctxt, 1);
+	}
+}
diff --git a/kernel/net/sunrpc/xprtrdma/transport.c b/kernel/net/sunrpc/xprtrdma/transport.c
new file mode 100644
index 000000000..54f23b1be
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/transport.c
@@ -0,0 +1,758 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * transport.c
+ *
+ * This file contains the top-level implementation of an RPC RDMA
+ * transport.
+ *
+ * Naming convention: functions beginning with xprt_ are part of the
+ * transport switch. All others are RPC RDMA internal.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/sunrpc/addr.h>
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+MODULE_LICENSE("Dual BSD/GPL");
+
+MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS");
+MODULE_AUTHOR("Network Appliance, Inc.");
+
+/*
+ * tunables
+ */
+
+static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
+static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_inline_write_padding;
+static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
+		int xprt_rdma_pad_optimize = 1;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+
+static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
+static unsigned int zero;
+static unsigned int max_padding = PAGE_SIZE;
+static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
+static unsigned int max_memreg = RPCRDMA_LAST - 1;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+static struct ctl_table xr_tunables_table[] = {
+	{
+		.procname	= "rdma_slot_table_entries",
+		.data		= &xprt_rdma_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.procname	= "rdma_max_inline_read",
+		.data		= &xprt_rdma_max_inline_read,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "rdma_max_inline_write",
+		.data		= &xprt_rdma_max_inline_write,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "rdma_inline_write_padding",
+		.data		= &xprt_rdma_inline_write_padding,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &max_padding,
+	},
+	{
+		.procname	= "rdma_memreg_strategy",
+		.data		= &xprt_rdma_memreg_strategy,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_memreg,
+		.extra2		= &max_memreg,
+	},
+	{
+		.procname	= "rdma_pad_optimize",
+		.data		= &xprt_rdma_pad_optimize,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{ },
+};
+
+static struct ctl_table sunrpc_table[] = {
+	{
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= xr_tunables_table
+	},
+	{ },
+};
+
+#endif
+
+#define RPCRDMA_BIND_TO		(60U * HZ)
+#define RPCRDMA_INIT_REEST_TO	(5U * HZ)
+#define RPCRDMA_MAX_REEST_TO	(30U * HZ)
+#define RPCRDMA_IDLE_DISC_TO	(5U * 60 * HZ)
+
+static struct rpc_xprt_ops xprt_rdma_procs;	/* forward reference */
+
+static void
+xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
+{
+	struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+	char buf[20];
+
+	snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+	xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
+}
+
+static void
+xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
+{
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+	char buf[40];
+
+	snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+	xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
+}
+
+static void
+xprt_rdma_format_addresses(struct rpc_xprt *xprt)
+{
+	struct sockaddr *sap = (struct sockaddr *)
+					&rpcx_to_rdmad(xprt).addr;
+	char buf[128];
+
+	switch (sap->sa_family) {
+	case AF_INET:
+		xprt_rdma_format_addresses4(xprt, sap);
+		break;
+	case AF_INET6:
+		xprt_rdma_format_addresses6(xprt, sap);
+		break;
+	default:
+		pr_err("rpcrdma: Unrecognized address family\n");
+		return;
+	}
+
+	(void)rpc_ntop(sap, buf, sizeof(buf));
+	xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+	snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
+	xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
+
+	snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
+
+	xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
+}
+
+static void
+xprt_rdma_free_addresses(struct rpc_xprt *xprt)
+{
+	unsigned int i;
+
+	for (i = 0; i < RPC_DISPLAY_MAX; i++)
+		switch (i) {
+		case RPC_DISPLAY_PROTO:
+		case RPC_DISPLAY_NETID:
+			continue;
+		default:
+			kfree(xprt->address_strings[i]);
+		}
+}
+
+static void
+xprt_rdma_connect_worker(struct work_struct *work)
+{
+	struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
+						   rx_connect_worker.work);
+	struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+	int rc = 0;
+
+	xprt_clear_connected(xprt);
+
+	dprintk("RPC:       %s: %sconnect\n", __func__,
+			r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
+	rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+	if (rc)
+		xprt_wake_pending_tasks(xprt, rc);
+
+	dprintk("RPC:       %s: exit\n", __func__);
+	xprt_clear_connecting(xprt);
+}
+
+/*
+ * xprt_rdma_destroy
+ *
+ * Destroy the xprt.
+ * Free all memory associated with the object, including its own.
+ * NOTE: none of the *destroy methods free memory for their top-level
+ * objects, even though they may have allocated it (they do free
+ * private memory). It's up to the caller to handle it. In this
+ * case (RDMA transport), all structure memory is inlined with the
+ * struct rpcrdma_xprt.
+ */
+static void
+xprt_rdma_destroy(struct rpc_xprt *xprt)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	dprintk("RPC:       %s: called\n", __func__);
+
+	cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
+
+	xprt_clear_connected(xprt);
+
+	rpcrdma_buffer_destroy(&r_xprt->rx_buf);
+	rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
+	rpcrdma_ia_close(&r_xprt->rx_ia);
+
+	xprt_rdma_free_addresses(xprt);
+
+	xprt_free(xprt);
+
+	dprintk("RPC:       %s: returning\n", __func__);
+
+	module_put(THIS_MODULE);
+}
+
+static const struct rpc_timeout xprt_rdma_default_timeout = {
+	.to_initval = 60 * HZ,
+	.to_maxval = 60 * HZ,
+};
+
+/**
+ * xprt_setup_rdma - Set up transport to use RDMA
+ *
+ * @args: rpc transport arguments
+ */
+static struct rpc_xprt *
+xprt_setup_rdma(struct xprt_create *args)
+{
+	struct rpcrdma_create_data_internal cdata;
+	struct rpc_xprt *xprt;
+	struct rpcrdma_xprt *new_xprt;
+	struct rpcrdma_ep *new_ep;
+	struct sockaddr_in *sin;
+	int rc;
+
+	if (args->addrlen > sizeof(xprt->addr)) {
+		dprintk("RPC:       %s: address too large\n", __func__);
+		return ERR_PTR(-EBADF);
+	}
+
+	xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
+			xprt_rdma_slot_table_entries,
+			xprt_rdma_slot_table_entries);
+	if (xprt == NULL) {
+		dprintk("RPC:       %s: couldn't allocate rpcrdma_xprt\n",
+			__func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* 60 second timeout, no retries */
+	xprt->timeout = &xprt_rdma_default_timeout;
+	xprt->bind_timeout = RPCRDMA_BIND_TO;
+	xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
+	xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
+
+	xprt->resvport = 0;		/* privileged port not needed */
+	xprt->tsh_size = 0;		/* RPC-RDMA handles framing */
+	xprt->ops = &xprt_rdma_procs;
+
+	/*
+	 * Set up RDMA-specific connect data.
+	 */
+
+	/* Put server RDMA address in local cdata */
+	memcpy(&cdata.addr, args->dstaddr, args->addrlen);
+
+	/* Ensure xprt->addr holds valid server TCP (not RDMA)
+	 * address, for any side protocols which peek at it */
+	xprt->prot = IPPROTO_TCP;
+	xprt->addrlen = args->addrlen;
+	memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
+
+	sin = (struct sockaddr_in *)&cdata.addr;
+	if (ntohs(sin->sin_port) != 0)
+		xprt_set_bound(xprt);
+
+	dprintk("RPC:       %s: %pI4:%u\n",
+		__func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
+
+	/* Set max requests */
+	cdata.max_requests = xprt->max_reqs;
+
+	/* Set some length limits */
+	cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
+	cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
+
+	cdata.inline_wsize = xprt_rdma_max_inline_write;
+	if (cdata.inline_wsize > cdata.wsize)
+		cdata.inline_wsize = cdata.wsize;
+
+	cdata.inline_rsize = xprt_rdma_max_inline_read;
+	if (cdata.inline_rsize > cdata.rsize)
+		cdata.inline_rsize = cdata.rsize;
+
+	cdata.padding = xprt_rdma_inline_write_padding;
+
+	/*
+	 * Create new transport instance, which includes initialized
+	 *  o ia
+	 *  o endpoint
+	 *  o buffers
+	 */
+
+	new_xprt = rpcx_to_rdmax(xprt);
+
+	rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
+				xprt_rdma_memreg_strategy);
+	if (rc)
+		goto out1;
+
+	/*
+	 * initialize and create ep
+	 */
+	new_xprt->rx_data = cdata;
+	new_ep = &new_xprt->rx_ep;
+	new_ep->rep_remote_addr = cdata.addr;
+
+	rc = rpcrdma_ep_create(&new_xprt->rx_ep,
+				&new_xprt->rx_ia, &new_xprt->rx_data);
+	if (rc)
+		goto out2;
+
+	/*
+	 * Allocate pre-registered send and receive buffers for headers and
+	 * any inline data. Also specify any padding which will be provided
+	 * from a preregistered zero buffer.
+	 */
+	rc = rpcrdma_buffer_create(new_xprt);
+	if (rc)
+		goto out3;
+
+	/*
+	 * Register a callback for connection events. This is necessary because
+	 * connection loss notification is async. We also catch connection loss
+	 * when reaping receives.
+	 */
+	INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
+			  xprt_rdma_connect_worker);
+
+	xprt_rdma_format_addresses(xprt);
+	xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
+	if (xprt->max_payload == 0)
+		goto out4;
+	xprt->max_payload <<= PAGE_SHIFT;
+	dprintk("RPC:       %s: transport data payload maximum: %zu bytes\n",
+		__func__, xprt->max_payload);
+
+	if (!try_module_get(THIS_MODULE))
+		goto out4;
+
+	return xprt;
+
+out4:
+	xprt_rdma_free_addresses(xprt);
+	rc = -EINVAL;
+out3:
+	rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
+out2:
+	rpcrdma_ia_close(&new_xprt->rx_ia);
+out1:
+	xprt_free(xprt);
+	return ERR_PTR(rc);
+}
+
+/*
+ * Close a connection, during shutdown or timeout/reconnect
+ */
+static void
+xprt_rdma_close(struct rpc_xprt *xprt)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	dprintk("RPC:       %s: closing\n", __func__);
+	if (r_xprt->rx_ep.rep_connected > 0)
+		xprt->reestablish_timeout = 0;
+	xprt_disconnect_done(xprt);
+	rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+}
+
+static void
+xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
+{
+	struct sockaddr_in *sap;
+
+	sap = (struct sockaddr_in *)&xprt->addr;
+	sap->sin_port = htons(port);
+	sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
+	sap->sin_port = htons(port);
+	dprintk("RPC:       %s: %u\n", __func__, port);
+}
+
+static void
+xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	if (r_xprt->rx_ep.rep_connected != 0) {
+		/* Reconnect */
+		schedule_delayed_work(&r_xprt->rx_connect_worker,
+				      xprt->reestablish_timeout);
+		xprt->reestablish_timeout <<= 1;
+		if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
+			xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
+		else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
+			xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
+	} else {
+		schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
+		if (!RPC_IS_ASYNC(task))
+			flush_delayed_work(&r_xprt->rx_connect_worker);
+	}
+}
+
+/*
+ * The RDMA allocate/free functions need the task structure as a place
+ * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
+ * sequence.
+ *
+ * The RPC layer allocates both send and receive buffers in the same call
+ * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer).
+ * We may register rq_rcv_buf when using reply chunks.
+ */
+static void *
+xprt_rdma_allocate(struct rpc_task *task, size_t size)
+{
+	struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	struct rpcrdma_regbuf *rb;
+	struct rpcrdma_req *req;
+	size_t min_size;
+	gfp_t flags;
+
+	req = rpcrdma_buffer_get(&r_xprt->rx_buf);
+	if (req == NULL)
+		return NULL;
+
+	flags = GFP_NOIO | __GFP_NOWARN;
+	if (RPC_IS_SWAPPER(task))
+		flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
+
+	if (req->rl_rdmabuf == NULL)
+		goto out_rdmabuf;
+	if (req->rl_sendbuf == NULL)
+		goto out_sendbuf;
+	if (size > req->rl_sendbuf->rg_size)
+		goto out_sendbuf;
+
+out:
+	dprintk("RPC:       %s: size %zd, request 0x%p\n", __func__, size, req);
+	req->rl_connect_cookie = 0;	/* our reserved value */
+	return req->rl_sendbuf->rg_base;
+
+out_rdmabuf:
+	min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
+	rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags);
+	if (IS_ERR(rb))
+		goto out_fail;
+	req->rl_rdmabuf = rb;
+
+out_sendbuf:
+	/* XDR encoding and RPC/RDMA marshaling of this request has not
+	 * yet occurred. Thus a lower bound is needed to prevent buffer
+	 * overrun during marshaling.
+	 *
+	 * RPC/RDMA marshaling may choose to send payload bearing ops
+	 * inline, if the result is smaller than the inline threshold.
+	 * The value of the "size" argument accounts for header
+	 * requirements but not for the payload in these cases.
+	 *
+	 * Likewise, allocate enough space to receive a reply up to the
+	 * size of the inline threshold.
+	 *
+	 * It's unlikely that both the send header and the received
+	 * reply will be large, but slush is provided here to allow
+	 * flexibility when marshaling.
+	 */
+	min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp);
+	min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
+	if (size < min_size)
+		size = min_size;
+
+	rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags);
+	if (IS_ERR(rb))
+		goto out_fail;
+	rb->rg_owner = req;
+
+	r_xprt->rx_stats.hardway_register_count += size;
+	rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf);
+	req->rl_sendbuf = rb;
+	goto out;
+
+out_fail:
+	rpcrdma_buffer_put(req);
+	r_xprt->rx_stats.failed_marshal_count++;
+	return NULL;
+}
+
+/*
+ * This function returns all RDMA resources to the pool.
+ */
+static void
+xprt_rdma_free(void *buffer)
+{
+	struct rpcrdma_req *req;
+	struct rpcrdma_xprt *r_xprt;
+	struct rpcrdma_regbuf *rb;
+	int i;
+
+	if (buffer == NULL)
+		return;
+
+	rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]);
+	req = rb->rg_owner;
+	r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
+
+	dprintk("RPC:       %s: called on 0x%p\n", __func__, req->rl_reply);
+
+	for (i = 0; req->rl_nchunks;) {
+		--req->rl_nchunks;
+		i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt,
+						    &req->rl_segments[i]);
+	}
+
+	rpcrdma_buffer_put(req);
+}
+
+/*
+ * send_request invokes the meat of RPC RDMA. It must do the following:
+ *  1.  Marshal the RPC request into an RPC RDMA request, which means
+ *	putting a header in front of data, and creating IOVs for RDMA
+ *	from those in the request.
+ *  2.  In marshaling, detect opportunities for RDMA, and use them.
+ *  3.  Post a recv message to set up asynch completion, then send
+ *	the request (rpcrdma_ep_post).
+ *  4.  No partial sends are possible in the RPC-RDMA protocol (as in UDP).
+ */
+
+static int
+xprt_rdma_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *rqst = task->tk_rqstp;
+	struct rpc_xprt *xprt = rqst->rq_xprt;
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	int rc = 0;
+
+	rc = rpcrdma_marshal_req(rqst);
+	if (rc < 0)
+		goto failed_marshal;
+
+	if (req->rl_reply == NULL) 		/* e.g. reconnection */
+		rpcrdma_recv_buffer_get(req);
+
+	if (req->rl_reply) {
+		req->rl_reply->rr_func = rpcrdma_reply_handler;
+		/* this need only be done once, but... */
+		req->rl_reply->rr_xprt = xprt;
+	}
+
+	/* Must suppress retransmit to maintain credits */
+	if (req->rl_connect_cookie == xprt->connect_cookie)
+		goto drop_connection;
+	req->rl_connect_cookie = xprt->connect_cookie;
+
+	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
+		goto drop_connection;
+
+	rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
+	rqst->rq_bytes_sent = 0;
+	return 0;
+
+failed_marshal:
+	r_xprt->rx_stats.failed_marshal_count++;
+	dprintk("RPC:       %s: rpcrdma_marshal_req failed, status %i\n",
+		__func__, rc);
+	if (rc == -EIO)
+		return -EIO;
+drop_connection:
+	xprt_disconnect_done(xprt);
+	return -ENOTCONN;	/* implies disconnect */
+}
+
+static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	long idle_time = 0;
+
+	if (xprt_connected(xprt))
+		idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+	seq_printf(seq,
+	  "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
+	  "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
+
+	   0,	/* need a local port? */
+	   xprt->stat.bind_count,
+	   xprt->stat.connect_count,
+	   xprt->stat.connect_time,
+	   idle_time,
+	   xprt->stat.sends,
+	   xprt->stat.recvs,
+	   xprt->stat.bad_xids,
+	   xprt->stat.req_u,
+	   xprt->stat.bklog_u,
+
+	   r_xprt->rx_stats.read_chunk_count,
+	   r_xprt->rx_stats.write_chunk_count,
+	   r_xprt->rx_stats.reply_chunk_count,
+	   r_xprt->rx_stats.total_rdma_request,
+	   r_xprt->rx_stats.total_rdma_reply,
+	   r_xprt->rx_stats.pullup_copy_count,
+	   r_xprt->rx_stats.fixup_copy_count,
+	   r_xprt->rx_stats.hardway_register_count,
+	   r_xprt->rx_stats.failed_marshal_count,
+	   r_xprt->rx_stats.bad_reply_count);
+}
+
+/*
+ * Plumbing for rpc transport switch and kernel module
+ */
+
+static struct rpc_xprt_ops xprt_rdma_procs = {
+	.reserve_xprt		= xprt_reserve_xprt_cong,
+	.release_xprt		= xprt_release_xprt_cong, /* sunrpc/xprt.c */
+	.alloc_slot		= xprt_alloc_slot,
+	.release_request	= xprt_release_rqst_cong,       /* ditto */
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def, /* ditto */
+	.rpcbind		= rpcb_getport_async,	/* sunrpc/rpcb_clnt.c */
+	.set_port		= xprt_rdma_set_port,
+	.connect		= xprt_rdma_connect,
+	.buf_alloc		= xprt_rdma_allocate,
+	.buf_free		= xprt_rdma_free,
+	.send_request		= xprt_rdma_send_request,
+	.close			= xprt_rdma_close,
+	.destroy		= xprt_rdma_destroy,
+	.print_stats		= xprt_rdma_print_stats
+};
+
+static struct xprt_class xprt_rdma = {
+	.list			= LIST_HEAD_INIT(xprt_rdma.list),
+	.name			= "rdma",
+	.owner			= THIS_MODULE,
+	.ident			= XPRT_TRANSPORT_RDMA,
+	.setup			= xprt_setup_rdma,
+};
+
+static void __exit xprt_rdma_cleanup(void)
+{
+	int rc;
+
+	dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	if (sunrpc_table_header) {
+		unregister_sysctl_table(sunrpc_table_header);
+		sunrpc_table_header = NULL;
+	}
+#endif
+	rc = xprt_unregister_transport(&xprt_rdma);
+	if (rc)
+		dprintk("RPC:       %s: xprt_unregister returned %i\n",
+			__func__, rc);
+}
+
+static int __init xprt_rdma_init(void)
+{
+	int rc;
+
+	rc = xprt_register_transport(&xprt_rdma);
+
+	if (rc)
+		return rc;
+
+	dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
+
+	dprintk("Defaults:\n");
+	dprintk("\tSlots %d\n"
+		"\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
+		xprt_rdma_slot_table_entries,
+		xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
+	dprintk("\tPadding %d\n\tMemreg %d\n",
+		xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	if (!sunrpc_table_header)
+		sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+	return 0;
+}
+
+module_init(xprt_rdma_init);
+module_exit(xprt_rdma_cleanup);
diff --git a/kernel/net/sunrpc/xprtrdma/verbs.c b/kernel/net/sunrpc/xprtrdma/verbs.c
new file mode 100644
index 000000000..4870d272e
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/verbs.c
@@ -0,0 +1,1672 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * verbs.c
+ *
+ * Encapsulates the major functions managing:
+ *  o adapters
+ *  o endpoints
+ *  o connections
+ *  o buffer memory
+ */
+
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/prefetch.h>
+#include <linux/sunrpc/addr.h>
+#include <asm/bitops.h>
+
+#include "xprt_rdma.h"
+
+/*
+ * Globals/Macros
+ */
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+/*
+ * internal functions
+ */
+
+/*
+ * handle replies in tasklet context, using a single, global list
+ * rdma tasklet function -- just turn around and call the func
+ * for all replies on the list
+ */
+
+static DEFINE_SPINLOCK(rpcrdma_tk_lock_g);
+static LIST_HEAD(rpcrdma_tasklets_g);
+
+static void
+rpcrdma_run_tasklet(unsigned long data)
+{
+	struct rpcrdma_rep *rep;
+	void (*func)(struct rpcrdma_rep *);
+	unsigned long flags;
+
+	data = data;
+	spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	while (!list_empty(&rpcrdma_tasklets_g)) {
+		rep = list_entry(rpcrdma_tasklets_g.next,
+				 struct rpcrdma_rep, rr_list);
+		list_del(&rep->rr_list);
+		func = rep->rr_func;
+		rep->rr_func = NULL;
+		spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+
+		if (func)
+			func(rep);
+		else
+			rpcrdma_recv_buffer_put(rep);
+
+		spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	}
+	spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+}
+
+static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL);
+
+static const char * const async_event[] = {
+	"CQ error",
+	"QP fatal error",
+	"QP request error",
+	"QP access error",
+	"communication established",
+	"send queue drained",
+	"path migration successful",
+	"path mig error",
+	"device fatal error",
+	"port active",
+	"port error",
+	"LID change",
+	"P_key change",
+	"SM change",
+	"SRQ error",
+	"SRQ limit reached",
+	"last WQE reached",
+	"client reregister",
+	"GID change",
+};
+
+#define ASYNC_MSG(status)					\
+	((status) < ARRAY_SIZE(async_event) ?			\
+		async_event[(status)] : "unknown async error")
+
+static void
+rpcrdma_schedule_tasklet(struct list_head *sched_list)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	list_splice_tail(sched_list, &rpcrdma_tasklets_g);
+	spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+	tasklet_schedule(&rpcrdma_tasklet_g);
+}
+
+static void
+rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
+{
+	struct rpcrdma_ep *ep = context;
+
+	pr_err("RPC:       %s: %s on device %s ep %p\n",
+	       __func__, ASYNC_MSG(event->event),
+		event->device->name, context);
+	if (ep->rep_connected == 1) {
+		ep->rep_connected = -EIO;
+		rpcrdma_conn_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+	}
+}
+
+static void
+rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
+{
+	struct rpcrdma_ep *ep = context;
+
+	pr_err("RPC:       %s: %s on device %s ep %p\n",
+	       __func__, ASYNC_MSG(event->event),
+		event->device->name, context);
+	if (ep->rep_connected == 1) {
+		ep->rep_connected = -EIO;
+		rpcrdma_conn_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+	}
+}
+
+static const char * const wc_status[] = {
+	"success",
+	"local length error",
+	"local QP operation error",
+	"local EE context operation error",
+	"local protection error",
+	"WR flushed",
+	"memory management operation error",
+	"bad response error",
+	"local access error",
+	"remote invalid request error",
+	"remote access error",
+	"remote operation error",
+	"transport retry counter exceeded",
+	"RNR retry counter exceeded",
+	"local RDD violation error",
+	"remove invalid RD request",
+	"operation aborted",
+	"invalid EE context number",
+	"invalid EE context state",
+	"fatal error",
+	"response timeout error",
+	"general error",
+};
+
+#define COMPLETION_MSG(status)					\
+	((status) < ARRAY_SIZE(wc_status) ?			\
+		wc_status[(status)] : "unexpected completion error")
+
+static void
+rpcrdma_sendcq_process_wc(struct ib_wc *wc)
+{
+	/* WARNING: Only wr_id and status are reliable at this point */
+	if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) {
+		if (wc->status != IB_WC_SUCCESS &&
+		    wc->status != IB_WC_WR_FLUSH_ERR)
+			pr_err("RPC:       %s: SEND: %s\n",
+			       __func__, COMPLETION_MSG(wc->status));
+	} else {
+		struct rpcrdma_mw *r;
+
+		r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id;
+		r->mw_sendcompletion(wc);
+	}
+}
+
+static int
+rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+{
+	struct ib_wc *wcs;
+	int budget, count, rc;
+
+	budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
+	do {
+		wcs = ep->rep_send_wcs;
+
+		rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
+		if (rc <= 0)
+			return rc;
+
+		count = rc;
+		while (count-- > 0)
+			rpcrdma_sendcq_process_wc(wcs++);
+	} while (rc == RPCRDMA_POLLSIZE && --budget);
+	return 0;
+}
+
+/*
+ * Handle send, fast_reg_mr, and local_inv completions.
+ *
+ * Send events are typically suppressed and thus do not result
+ * in an upcall. Occasionally one is signaled, however. This
+ * prevents the provider's completion queue from wrapping and
+ * losing a completion.
+ */
+static void
+rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context)
+{
+	struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
+	int rc;
+
+	rc = rpcrdma_sendcq_poll(cq, ep);
+	if (rc) {
+		dprintk("RPC:       %s: ib_poll_cq failed: %i\n",
+			__func__, rc);
+		return;
+	}
+
+	rc = ib_req_notify_cq(cq,
+			IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
+	if (rc == 0)
+		return;
+	if (rc < 0) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed: %i\n",
+			__func__, rc);
+		return;
+	}
+
+	rpcrdma_sendcq_poll(cq, ep);
+}
+
+static void
+rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list)
+{
+	struct rpcrdma_rep *rep =
+			(struct rpcrdma_rep *)(unsigned long)wc->wr_id;
+
+	/* WARNING: Only wr_id and status are reliable at this point */
+	if (wc->status != IB_WC_SUCCESS)
+		goto out_fail;
+
+	/* status == SUCCESS means all fields in wc are trustworthy */
+	if (wc->opcode != IB_WC_RECV)
+		return;
+
+	dprintk("RPC:       %s: rep %p opcode 'recv', length %u: success\n",
+		__func__, rep, wc->byte_len);
+
+	rep->rr_len = wc->byte_len;
+	ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device,
+				   rdmab_addr(rep->rr_rdmabuf),
+				   rep->rr_len, DMA_FROM_DEVICE);
+	prefetch(rdmab_to_msg(rep->rr_rdmabuf));
+
+out_schedule:
+	list_add_tail(&rep->rr_list, sched_list);
+	return;
+out_fail:
+	if (wc->status != IB_WC_WR_FLUSH_ERR)
+		pr_err("RPC:       %s: rep %p: %s\n",
+		       __func__, rep, COMPLETION_MSG(wc->status));
+	rep->rr_len = ~0U;
+	goto out_schedule;
+}
+
+static int
+rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep)
+{
+	struct list_head sched_list;
+	struct ib_wc *wcs;
+	int budget, count, rc;
+
+	INIT_LIST_HEAD(&sched_list);
+	budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE;
+	do {
+		wcs = ep->rep_recv_wcs;
+
+		rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs);
+		if (rc <= 0)
+			goto out_schedule;
+
+		count = rc;
+		while (count-- > 0)
+			rpcrdma_recvcq_process_wc(wcs++, &sched_list);
+	} while (rc == RPCRDMA_POLLSIZE && --budget);
+	rc = 0;
+
+out_schedule:
+	rpcrdma_schedule_tasklet(&sched_list);
+	return rc;
+}
+
+/*
+ * Handle receive completions.
+ *
+ * It is reentrant but processes single events in order to maintain
+ * ordering of receives to keep server credits.
+ *
+ * It is the responsibility of the scheduled tasklet to return
+ * recv buffers to the pool. NOTE: this affects synchronization of
+ * connection shutdown. That is, the structures required for
+ * the completion of the reply handler must remain intact until
+ * all memory has been reclaimed.
+ */
+static void
+rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context)
+{
+	struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context;
+	int rc;
+
+	rc = rpcrdma_recvcq_poll(cq, ep);
+	if (rc) {
+		dprintk("RPC:       %s: ib_poll_cq failed: %i\n",
+			__func__, rc);
+		return;
+	}
+
+	rc = ib_req_notify_cq(cq,
+			IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
+	if (rc == 0)
+		return;
+	if (rc < 0) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed: %i\n",
+			__func__, rc);
+		return;
+	}
+
+	rpcrdma_recvcq_poll(cq, ep);
+}
+
+static void
+rpcrdma_flush_cqs(struct rpcrdma_ep *ep)
+{
+	struct ib_wc wc;
+	LIST_HEAD(sched_list);
+
+	while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0)
+		rpcrdma_recvcq_process_wc(&wc, &sched_list);
+	if (!list_empty(&sched_list))
+		rpcrdma_schedule_tasklet(&sched_list);
+	while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0)
+		rpcrdma_sendcq_process_wc(&wc);
+}
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+static const char * const conn[] = {
+	"address resolved",
+	"address error",
+	"route resolved",
+	"route error",
+	"connect request",
+	"connect response",
+	"connect error",
+	"unreachable",
+	"rejected",
+	"established",
+	"disconnected",
+	"device removal",
+	"multicast join",
+	"multicast error",
+	"address change",
+	"timewait exit",
+};
+
+#define CONNECTION_MSG(status)						\
+	((status) < ARRAY_SIZE(conn) ?					\
+		conn[(status)] : "unrecognized connection error")
+#endif
+
+static int
+rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
+{
+	struct rpcrdma_xprt *xprt = id->context;
+	struct rpcrdma_ia *ia = &xprt->rx_ia;
+	struct rpcrdma_ep *ep = &xprt->rx_ep;
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr;
+#endif
+	struct ib_qp_attr *attr = &ia->ri_qp_attr;
+	struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
+	int connstate = 0;
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_ADDR_RESOLVED:
+	case RDMA_CM_EVENT_ROUTE_RESOLVED:
+		ia->ri_async_rc = 0;
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ADDR_ERROR:
+		ia->ri_async_rc = -EHOSTUNREACH;
+		dprintk("RPC:       %s: CM address resolution error, ep 0x%p\n",
+			__func__, ep);
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ROUTE_ERROR:
+		ia->ri_async_rc = -ENETUNREACH;
+		dprintk("RPC:       %s: CM route resolution error, ep 0x%p\n",
+			__func__, ep);
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ESTABLISHED:
+		connstate = 1;
+		ib_query_qp(ia->ri_id->qp, attr,
+			    IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
+			    iattr);
+		dprintk("RPC:       %s: %d responder resources"
+			" (%d initiator)\n",
+			__func__, attr->max_dest_rd_atomic,
+			attr->max_rd_atomic);
+		goto connected;
+	case RDMA_CM_EVENT_CONNECT_ERROR:
+		connstate = -ENOTCONN;
+		goto connected;
+	case RDMA_CM_EVENT_UNREACHABLE:
+		connstate = -ENETDOWN;
+		goto connected;
+	case RDMA_CM_EVENT_REJECTED:
+		connstate = -ECONNREFUSED;
+		goto connected;
+	case RDMA_CM_EVENT_DISCONNECTED:
+		connstate = -ECONNABORTED;
+		goto connected;
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		connstate = -ENODEV;
+connected:
+		dprintk("RPC:       %s: %sconnected\n",
+					__func__, connstate > 0 ? "" : "dis");
+		ep->rep_connected = connstate;
+		rpcrdma_conn_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+		/*FALLTHROUGH*/
+	default:
+		dprintk("RPC:       %s: %pIS:%u (ep 0x%p): %s\n",
+			__func__, sap, rpc_get_port(sap), ep,
+			CONNECTION_MSG(event->event));
+		break;
+	}
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	if (connstate == 1) {
+		int ird = attr->max_dest_rd_atomic;
+		int tird = ep->rep_remote_cma.responder_resources;
+
+		pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
+			sap, rpc_get_port(sap),
+			ia->ri_id->device->name,
+			ia->ri_ops->ro_displayname,
+			xprt->rx_buf.rb_max_requests,
+			ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
+	} else if (connstate < 0) {
+		pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
+			sap, rpc_get_port(sap), connstate);
+	}
+#endif
+
+	return 0;
+}
+
+static struct rdma_cm_id *
+rpcrdma_create_id(struct rpcrdma_xprt *xprt,
+			struct rpcrdma_ia *ia, struct sockaddr *addr)
+{
+	struct rdma_cm_id *id;
+	int rc;
+
+	init_completion(&ia->ri_done);
+
+	id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC);
+	if (IS_ERR(id)) {
+		rc = PTR_ERR(id);
+		dprintk("RPC:       %s: rdma_create_id() failed %i\n",
+			__func__, rc);
+		return id;
+	}
+
+	ia->ri_async_rc = -ETIMEDOUT;
+	rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_resolve_addr() failed %i\n",
+			__func__, rc);
+		goto out;
+	}
+	wait_for_completion_interruptible_timeout(&ia->ri_done,
+				msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
+	rc = ia->ri_async_rc;
+	if (rc)
+		goto out;
+
+	ia->ri_async_rc = -ETIMEDOUT;
+	rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_resolve_route() failed %i\n",
+			__func__, rc);
+		goto out;
+	}
+	wait_for_completion_interruptible_timeout(&ia->ri_done,
+				msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
+	rc = ia->ri_async_rc;
+	if (rc)
+		goto out;
+
+	return id;
+
+out:
+	rdma_destroy_id(id);
+	return ERR_PTR(rc);
+}
+
+/*
+ * Drain any cq, prior to teardown.
+ */
+static void
+rpcrdma_clean_cq(struct ib_cq *cq)
+{
+	struct ib_wc wc;
+	int count = 0;
+
+	while (1 == ib_poll_cq(cq, 1, &wc))
+		++count;
+
+	if (count)
+		dprintk("RPC:       %s: flushed %d events (last 0x%x)\n",
+			__func__, count, wc.opcode);
+}
+
+/*
+ * Exported functions.
+ */
+
+/*
+ * Open and initialize an Interface Adapter.
+ *  o initializes fields of struct rpcrdma_ia, including
+ *    interface and provider attributes and protection zone.
+ */
+int
+rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
+{
+	int rc, mem_priv;
+	struct rpcrdma_ia *ia = &xprt->rx_ia;
+	struct ib_device_attr *devattr = &ia->ri_devattr;
+
+	ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
+	if (IS_ERR(ia->ri_id)) {
+		rc = PTR_ERR(ia->ri_id);
+		goto out1;
+	}
+
+	ia->ri_pd = ib_alloc_pd(ia->ri_id->device);
+	if (IS_ERR(ia->ri_pd)) {
+		rc = PTR_ERR(ia->ri_pd);
+		dprintk("RPC:       %s: ib_alloc_pd() failed %i\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	rc = ib_query_device(ia->ri_id->device, devattr);
+	if (rc) {
+		dprintk("RPC:       %s: ib_query_device failed %d\n",
+			__func__, rc);
+		goto out3;
+	}
+
+	if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) {
+		ia->ri_have_dma_lkey = 1;
+		ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey;
+	}
+
+	if (memreg == RPCRDMA_FRMR) {
+		/* Requires both frmr reg and local dma lkey */
+		if (((devattr->device_cap_flags &
+		     (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) !=
+		    (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) ||
+		      (devattr->max_fast_reg_page_list_len == 0)) {
+			dprintk("RPC:       %s: FRMR registration "
+				"not supported by HCA\n", __func__);
+			memreg = RPCRDMA_MTHCAFMR;
+		}
+	}
+	if (memreg == RPCRDMA_MTHCAFMR) {
+		if (!ia->ri_id->device->alloc_fmr) {
+			dprintk("RPC:       %s: MTHCAFMR registration "
+				"not supported by HCA\n", __func__);
+			memreg = RPCRDMA_ALLPHYSICAL;
+		}
+	}
+
+	/*
+	 * Optionally obtain an underlying physical identity mapping in
+	 * order to do a memory window-based bind. This base registration
+	 * is protected from remote access - that is enabled only by binding
+	 * for the specific bytes targeted during each RPC operation, and
+	 * revoked after the corresponding completion similar to a storage
+	 * adapter.
+	 */
+	switch (memreg) {
+	case RPCRDMA_FRMR:
+		ia->ri_ops = &rpcrdma_frwr_memreg_ops;
+		break;
+	case RPCRDMA_ALLPHYSICAL:
+		ia->ri_ops = &rpcrdma_physical_memreg_ops;
+		mem_priv = IB_ACCESS_LOCAL_WRITE |
+				IB_ACCESS_REMOTE_WRITE |
+				IB_ACCESS_REMOTE_READ;
+		goto register_setup;
+	case RPCRDMA_MTHCAFMR:
+		ia->ri_ops = &rpcrdma_fmr_memreg_ops;
+		if (ia->ri_have_dma_lkey)
+			break;
+		mem_priv = IB_ACCESS_LOCAL_WRITE;
+	register_setup:
+		ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv);
+		if (IS_ERR(ia->ri_bind_mem)) {
+			printk(KERN_ALERT "%s: ib_get_dma_mr for "
+				"phys register failed with %lX\n",
+				__func__, PTR_ERR(ia->ri_bind_mem));
+			rc = -ENOMEM;
+			goto out3;
+		}
+		break;
+	default:
+		printk(KERN_ERR "RPC: Unsupported memory "
+				"registration mode: %d\n", memreg);
+		rc = -ENOMEM;
+		goto out3;
+	}
+	dprintk("RPC:       %s: memory registration strategy is '%s'\n",
+		__func__, ia->ri_ops->ro_displayname);
+
+	/* Else will do memory reg/dereg for each chunk */
+	ia->ri_memreg_strategy = memreg;
+
+	rwlock_init(&ia->ri_qplock);
+	return 0;
+
+out3:
+	ib_dealloc_pd(ia->ri_pd);
+	ia->ri_pd = NULL;
+out2:
+	rdma_destroy_id(ia->ri_id);
+	ia->ri_id = NULL;
+out1:
+	return rc;
+}
+
+/*
+ * Clean up/close an IA.
+ *   o if event handles and PD have been initialized, free them.
+ *   o close the IA
+ */
+void
+rpcrdma_ia_close(struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	dprintk("RPC:       %s: entering\n", __func__);
+	if (ia->ri_bind_mem != NULL) {
+		rc = ib_dereg_mr(ia->ri_bind_mem);
+		dprintk("RPC:       %s: ib_dereg_mr returned %i\n",
+			__func__, rc);
+	}
+	if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
+		if (ia->ri_id->qp)
+			rdma_destroy_qp(ia->ri_id);
+		rdma_destroy_id(ia->ri_id);
+		ia->ri_id = NULL;
+	}
+	if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) {
+		rc = ib_dealloc_pd(ia->ri_pd);
+		dprintk("RPC:       %s: ib_dealloc_pd returned %i\n",
+			__func__, rc);
+	}
+}
+
+/*
+ * Create unconnected endpoint.
+ */
+int
+rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
+				struct rpcrdma_create_data_internal *cdata)
+{
+	struct ib_device_attr *devattr = &ia->ri_devattr;
+	struct ib_cq *sendcq, *recvcq;
+	int rc, err;
+
+	/* check provider's send/recv wr limits */
+	if (cdata->max_requests > devattr->max_qp_wr)
+		cdata->max_requests = devattr->max_qp_wr;
+
+	ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
+	ep->rep_attr.qp_context = ep;
+	ep->rep_attr.srq = NULL;
+	ep->rep_attr.cap.max_send_wr = cdata->max_requests;
+	rc = ia->ri_ops->ro_open(ia, ep, cdata);
+	if (rc)
+		return rc;
+	ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
+	ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2);
+	ep->rep_attr.cap.max_recv_sge = 1;
+	ep->rep_attr.cap.max_inline_data = 0;
+	ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+	ep->rep_attr.qp_type = IB_QPT_RC;
+	ep->rep_attr.port_num = ~0;
+
+	if (cdata->padding) {
+		ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding,
+						      GFP_KERNEL);
+		if (IS_ERR(ep->rep_padbuf))
+			return PTR_ERR(ep->rep_padbuf);
+	} else
+		ep->rep_padbuf = NULL;
+
+	dprintk("RPC:       %s: requested max: dtos: send %d recv %d; "
+		"iovs: send %d recv %d\n",
+		__func__,
+		ep->rep_attr.cap.max_send_wr,
+		ep->rep_attr.cap.max_recv_wr,
+		ep->rep_attr.cap.max_send_sge,
+		ep->rep_attr.cap.max_recv_sge);
+
+	/* set trigger for requesting send completion */
+	ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
+	if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS)
+		ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS;
+	else if (ep->rep_cqinit <= 2)
+		ep->rep_cqinit = 0;
+	INIT_CQCOUNT(ep);
+	init_waitqueue_head(&ep->rep_connect_wait);
+	INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
+
+	sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall,
+				  rpcrdma_cq_async_error_upcall, ep,
+				  ep->rep_attr.cap.max_send_wr + 1, 0);
+	if (IS_ERR(sendcq)) {
+		rc = PTR_ERR(sendcq);
+		dprintk("RPC:       %s: failed to create send CQ: %i\n",
+			__func__, rc);
+		goto out1;
+	}
+
+	rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP);
+	if (rc) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed: %i\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall,
+				  rpcrdma_cq_async_error_upcall, ep,
+				  ep->rep_attr.cap.max_recv_wr + 1, 0);
+	if (IS_ERR(recvcq)) {
+		rc = PTR_ERR(recvcq);
+		dprintk("RPC:       %s: failed to create recv CQ: %i\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP);
+	if (rc) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed: %i\n",
+			__func__, rc);
+		ib_destroy_cq(recvcq);
+		goto out2;
+	}
+
+	ep->rep_attr.send_cq = sendcq;
+	ep->rep_attr.recv_cq = recvcq;
+
+	/* Initialize cma parameters */
+
+	/* RPC/RDMA does not use private data */
+	ep->rep_remote_cma.private_data = NULL;
+	ep->rep_remote_cma.private_data_len = 0;
+
+	/* Client offers RDMA Read but does not initiate */
+	ep->rep_remote_cma.initiator_depth = 0;
+	if (devattr->max_qp_rd_atom > 32)	/* arbitrary but <= 255 */
+		ep->rep_remote_cma.responder_resources = 32;
+	else
+		ep->rep_remote_cma.responder_resources =
+						devattr->max_qp_rd_atom;
+
+	ep->rep_remote_cma.retry_count = 7;
+	ep->rep_remote_cma.flow_control = 0;
+	ep->rep_remote_cma.rnr_retry_count = 0;
+
+	return 0;
+
+out2:
+	err = ib_destroy_cq(sendcq);
+	if (err)
+		dprintk("RPC:       %s: ib_destroy_cq returned %i\n",
+			__func__, err);
+out1:
+	rpcrdma_free_regbuf(ia, ep->rep_padbuf);
+	return rc;
+}
+
+/*
+ * rpcrdma_ep_destroy
+ *
+ * Disconnect and destroy endpoint. After this, the only
+ * valid operations on the ep are to free it (if dynamically
+ * allocated) or re-create it.
+ */
+void
+rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	dprintk("RPC:       %s: entering, connected is %d\n",
+		__func__, ep->rep_connected);
+
+	cancel_delayed_work_sync(&ep->rep_connect_worker);
+
+	if (ia->ri_id->qp) {
+		rpcrdma_ep_disconnect(ep, ia);
+		rdma_destroy_qp(ia->ri_id);
+		ia->ri_id->qp = NULL;
+	}
+
+	rpcrdma_free_regbuf(ia, ep->rep_padbuf);
+
+	rpcrdma_clean_cq(ep->rep_attr.recv_cq);
+	rc = ib_destroy_cq(ep->rep_attr.recv_cq);
+	if (rc)
+		dprintk("RPC:       %s: ib_destroy_cq returned %i\n",
+			__func__, rc);
+
+	rpcrdma_clean_cq(ep->rep_attr.send_cq);
+	rc = ib_destroy_cq(ep->rep_attr.send_cq);
+	if (rc)
+		dprintk("RPC:       %s: ib_destroy_cq returned %i\n",
+			__func__, rc);
+}
+
+/*
+ * Connect unconnected endpoint.
+ */
+int
+rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	struct rdma_cm_id *id, *old;
+	int rc = 0;
+	int retry_count = 0;
+
+	if (ep->rep_connected != 0) {
+		struct rpcrdma_xprt *xprt;
+retry:
+		dprintk("RPC:       %s: reconnecting...\n", __func__);
+
+		rpcrdma_ep_disconnect(ep, ia);
+		rpcrdma_flush_cqs(ep);
+
+		xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
+		ia->ri_ops->ro_reset(xprt);
+
+		id = rpcrdma_create_id(xprt, ia,
+				(struct sockaddr *)&xprt->rx_data.addr);
+		if (IS_ERR(id)) {
+			rc = -EHOSTUNREACH;
+			goto out;
+		}
+		/* TEMP TEMP TEMP - fail if new device:
+		 * Deregister/remarshal *all* requests!
+		 * Close and recreate adapter, pd, etc!
+		 * Re-determine all attributes still sane!
+		 * More stuff I haven't thought of!
+		 * Rrrgh!
+		 */
+		if (ia->ri_id->device != id->device) {
+			printk("RPC:       %s: can't reconnect on "
+				"different device!\n", __func__);
+			rdma_destroy_id(id);
+			rc = -ENETUNREACH;
+			goto out;
+		}
+		/* END TEMP */
+		rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
+		if (rc) {
+			dprintk("RPC:       %s: rdma_create_qp failed %i\n",
+				__func__, rc);
+			rdma_destroy_id(id);
+			rc = -ENETUNREACH;
+			goto out;
+		}
+
+		write_lock(&ia->ri_qplock);
+		old = ia->ri_id;
+		ia->ri_id = id;
+		write_unlock(&ia->ri_qplock);
+
+		rdma_destroy_qp(old);
+		rdma_destroy_id(old);
+	} else {
+		dprintk("RPC:       %s: connecting...\n", __func__);
+		rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
+		if (rc) {
+			dprintk("RPC:       %s: rdma_create_qp failed %i\n",
+				__func__, rc);
+			/* do not update ep->rep_connected */
+			return -ENETUNREACH;
+		}
+	}
+
+	ep->rep_connected = 0;
+
+	rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_connect() failed with %i\n",
+				__func__, rc);
+		goto out;
+	}
+
+	wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
+
+	/*
+	 * Check state. A non-peer reject indicates no listener
+	 * (ECONNREFUSED), which may be a transient state. All
+	 * others indicate a transport condition which has already
+	 * undergone a best-effort.
+	 */
+	if (ep->rep_connected == -ECONNREFUSED &&
+	    ++retry_count <= RDMA_CONNECT_RETRY_MAX) {
+		dprintk("RPC:       %s: non-peer_reject, retry\n", __func__);
+		goto retry;
+	}
+	if (ep->rep_connected <= 0) {
+		/* Sometimes, the only way to reliably connect to remote
+		 * CMs is to use same nonzero values for ORD and IRD. */
+		if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 &&
+		    (ep->rep_remote_cma.responder_resources == 0 ||
+		     ep->rep_remote_cma.initiator_depth !=
+				ep->rep_remote_cma.responder_resources)) {
+			if (ep->rep_remote_cma.responder_resources == 0)
+				ep->rep_remote_cma.responder_resources = 1;
+			ep->rep_remote_cma.initiator_depth =
+				ep->rep_remote_cma.responder_resources;
+			goto retry;
+		}
+		rc = ep->rep_connected;
+	} else {
+		dprintk("RPC:       %s: connected\n", __func__);
+	}
+
+out:
+	if (rc)
+		ep->rep_connected = rc;
+	return rc;
+}
+
+/*
+ * rpcrdma_ep_disconnect
+ *
+ * This is separate from destroy to facilitate the ability
+ * to reconnect without recreating the endpoint.
+ *
+ * This call is not reentrant, and must not be made in parallel
+ * on the same endpoint.
+ */
+void
+rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	rpcrdma_flush_cqs(ep);
+	rc = rdma_disconnect(ia->ri_id);
+	if (!rc) {
+		/* returns without wait if not connected */
+		wait_event_interruptible(ep->rep_connect_wait,
+							ep->rep_connected != 1);
+		dprintk("RPC:       %s: after wait, %sconnected\n", __func__,
+			(ep->rep_connected == 1) ? "still " : "dis");
+	} else {
+		dprintk("RPC:       %s: rdma_disconnect %i\n", __func__, rc);
+		ep->rep_connected = rc;
+	}
+}
+
+static struct rpcrdma_req *
+rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_req *req;
+
+	req = kzalloc(sizeof(*req), GFP_KERNEL);
+	if (req == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	req->rl_buffer = &r_xprt->rx_buf;
+	return req;
+}
+
+static struct rpcrdma_rep *
+rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct rpcrdma_rep *rep;
+	int rc;
+
+	rc = -ENOMEM;
+	rep = kzalloc(sizeof(*rep), GFP_KERNEL);
+	if (rep == NULL)
+		goto out;
+
+	rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize,
+					       GFP_KERNEL);
+	if (IS_ERR(rep->rr_rdmabuf)) {
+		rc = PTR_ERR(rep->rr_rdmabuf);
+		goto out_free;
+	}
+
+	rep->rr_buffer = &r_xprt->rx_buf;
+	return rep;
+
+out_free:
+	kfree(rep);
+out:
+	return ERR_PTR(rc);
+}
+
+int
+rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+	char *p;
+	size_t len;
+	int i, rc;
+
+	buf->rb_max_requests = cdata->max_requests;
+	spin_lock_init(&buf->rb_lock);
+
+	/* Need to allocate:
+	 *   1.  arrays for send and recv pointers
+	 *   2.  arrays of struct rpcrdma_req to fill in pointers
+	 *   3.  array of struct rpcrdma_rep for replies
+	 * Send/recv buffers in req/rep need to be registered
+	 */
+	len = buf->rb_max_requests *
+		(sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));
+
+	p = kzalloc(len, GFP_KERNEL);
+	if (p == NULL) {
+		dprintk("RPC:       %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
+			__func__, len);
+		rc = -ENOMEM;
+		goto out;
+	}
+	buf->rb_pool = p;	/* for freeing it later */
+
+	buf->rb_send_bufs = (struct rpcrdma_req **) p;
+	p = (char *) &buf->rb_send_bufs[buf->rb_max_requests];
+	buf->rb_recv_bufs = (struct rpcrdma_rep **) p;
+	p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests];
+
+	rc = ia->ri_ops->ro_init(r_xprt);
+	if (rc)
+		goto out;
+
+	for (i = 0; i < buf->rb_max_requests; i++) {
+		struct rpcrdma_req *req;
+		struct rpcrdma_rep *rep;
+
+		req = rpcrdma_create_req(r_xprt);
+		if (IS_ERR(req)) {
+			dprintk("RPC:       %s: request buffer %d alloc"
+				" failed\n", __func__, i);
+			rc = PTR_ERR(req);
+			goto out;
+		}
+		buf->rb_send_bufs[i] = req;
+
+		rep = rpcrdma_create_rep(r_xprt);
+		if (IS_ERR(rep)) {
+			dprintk("RPC:       %s: reply buffer %d alloc failed\n",
+				__func__, i);
+			rc = PTR_ERR(rep);
+			goto out;
+		}
+		buf->rb_recv_bufs[i] = rep;
+	}
+
+	return 0;
+out:
+	rpcrdma_buffer_destroy(buf);
+	return rc;
+}
+
+static void
+rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep)
+{
+	if (!rep)
+		return;
+
+	rpcrdma_free_regbuf(ia, rep->rr_rdmabuf);
+	kfree(rep);
+}
+
+static void
+rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
+{
+	if (!req)
+		return;
+
+	rpcrdma_free_regbuf(ia, req->rl_sendbuf);
+	rpcrdma_free_regbuf(ia, req->rl_rdmabuf);
+	kfree(req);
+}
+
+void
+rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_ia *ia = rdmab_to_ia(buf);
+	int i;
+
+	/* clean up in reverse order from create
+	 *   1.  recv mr memory (mr free, then kfree)
+	 *   2.  send mr memory (mr free, then kfree)
+	 *   3.  MWs
+	 */
+	dprintk("RPC:       %s: entering\n", __func__);
+
+	for (i = 0; i < buf->rb_max_requests; i++) {
+		if (buf->rb_recv_bufs)
+			rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]);
+		if (buf->rb_send_bufs)
+			rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]);
+	}
+
+	ia->ri_ops->ro_destroy(buf);
+
+	kfree(buf->rb_pool);
+}
+
+/* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving
+ * some req segments uninitialized.
+ */
+static void
+rpcrdma_buffer_put_mr(struct rpcrdma_mw **mw, struct rpcrdma_buffer *buf)
+{
+	if (*mw) {
+		list_add_tail(&(*mw)->mw_list, &buf->rb_mws);
+		*mw = NULL;
+	}
+}
+
+/* Cycle mw's back in reverse order, and "spin" them.
+ * This delays and scrambles reuse as much as possible.
+ */
+static void
+rpcrdma_buffer_put_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_mr_seg *seg = req->rl_segments;
+	struct rpcrdma_mr_seg *seg1 = seg;
+	int i;
+
+	for (i = 1, seg++; i < RPCRDMA_MAX_SEGS; seg++, i++)
+		rpcrdma_buffer_put_mr(&seg->rl_mw, buf);
+	rpcrdma_buffer_put_mr(&seg1->rl_mw, buf);
+}
+
+static void
+rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
+{
+	buf->rb_send_bufs[--buf->rb_send_index] = req;
+	req->rl_niovs = 0;
+	if (req->rl_reply) {
+		buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply;
+		req->rl_reply->rr_func = NULL;
+		req->rl_reply = NULL;
+	}
+}
+
+/* rpcrdma_unmap_one() was already done during deregistration.
+ * Redo only the ib_post_send().
+ */
+static void
+rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia)
+{
+	struct rpcrdma_xprt *r_xprt =
+				container_of(ia, struct rpcrdma_xprt, rx_ia);
+	struct ib_send_wr invalidate_wr, *bad_wr;
+	int rc;
+
+	dprintk("RPC:       %s: FRMR %p is stale\n", __func__, r);
+
+	/* When this FRMR is re-inserted into rb_mws, it is no longer stale */
+	r->r.frmr.fr_state = FRMR_IS_INVALID;
+
+	memset(&invalidate_wr, 0, sizeof(invalidate_wr));
+	invalidate_wr.wr_id = (unsigned long)(void *)r;
+	invalidate_wr.opcode = IB_WR_LOCAL_INV;
+	invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey;
+	DECR_CQCOUNT(&r_xprt->rx_ep);
+
+	dprintk("RPC:       %s: frmr %p invalidating rkey %08x\n",
+		__func__, r, r->r.frmr.fr_mr->rkey);
+
+	read_lock(&ia->ri_qplock);
+	rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
+	read_unlock(&ia->ri_qplock);
+	if (rc) {
+		/* Force rpcrdma_buffer_get() to retry */
+		r->r.frmr.fr_state = FRMR_IS_STALE;
+		dprintk("RPC:       %s: ib_post_send failed, %i\n",
+			__func__, rc);
+	}
+}
+
+static void
+rpcrdma_retry_flushed_linv(struct list_head *stale,
+			   struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_ia *ia = rdmab_to_ia(buf);
+	struct list_head *pos;
+	struct rpcrdma_mw *r;
+	unsigned long flags;
+
+	list_for_each(pos, stale) {
+		r = list_entry(pos, struct rpcrdma_mw, mw_list);
+		rpcrdma_retry_local_inv(r, ia);
+	}
+
+	spin_lock_irqsave(&buf->rb_lock, flags);
+	list_splice_tail(stale, &buf->rb_mws);
+	spin_unlock_irqrestore(&buf->rb_lock, flags);
+}
+
+static struct rpcrdma_req *
+rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf,
+			 struct list_head *stale)
+{
+	struct rpcrdma_mw *r;
+	int i;
+
+	i = RPCRDMA_MAX_SEGS - 1;
+	while (!list_empty(&buf->rb_mws)) {
+		r = list_entry(buf->rb_mws.next,
+			       struct rpcrdma_mw, mw_list);
+		list_del(&r->mw_list);
+		if (r->r.frmr.fr_state == FRMR_IS_STALE) {
+			list_add(&r->mw_list, stale);
+			continue;
+		}
+		req->rl_segments[i].rl_mw = r;
+		if (unlikely(i-- == 0))
+			return req;	/* Success */
+	}
+
+	/* Not enough entries on rb_mws for this req */
+	rpcrdma_buffer_put_sendbuf(req, buf);
+	rpcrdma_buffer_put_mrs(req, buf);
+	return NULL;
+}
+
+static struct rpcrdma_req *
+rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf)
+{
+	struct rpcrdma_mw *r;
+	int i;
+
+	i = RPCRDMA_MAX_SEGS - 1;
+	while (!list_empty(&buf->rb_mws)) {
+		r = list_entry(buf->rb_mws.next,
+			       struct rpcrdma_mw, mw_list);
+		list_del(&r->mw_list);
+		req->rl_segments[i].rl_mw = r;
+		if (unlikely(i-- == 0))
+			return req;	/* Success */
+	}
+
+	/* Not enough entries on rb_mws for this req */
+	rpcrdma_buffer_put_sendbuf(req, buf);
+	rpcrdma_buffer_put_mrs(req, buf);
+	return NULL;
+}
+
+/*
+ * Get a set of request/reply buffers.
+ *
+ * Reply buffer (if needed) is attached to send buffer upon return.
+ * Rule:
+ *    rb_send_index and rb_recv_index MUST always be pointing to the
+ *    *next* available buffer (non-NULL). They are incremented after
+ *    removing buffers, and decremented *before* returning them.
+ */
+struct rpcrdma_req *
+rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
+{
+	struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
+	struct list_head stale;
+	struct rpcrdma_req *req;
+	unsigned long flags;
+
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	if (buffers->rb_send_index == buffers->rb_max_requests) {
+		spin_unlock_irqrestore(&buffers->rb_lock, flags);
+		dprintk("RPC:       %s: out of request buffers\n", __func__);
+		return ((struct rpcrdma_req *)NULL);
+	}
+
+	req = buffers->rb_send_bufs[buffers->rb_send_index];
+	if (buffers->rb_send_index < buffers->rb_recv_index) {
+		dprintk("RPC:       %s: %d extra receives outstanding (ok)\n",
+			__func__,
+			buffers->rb_recv_index - buffers->rb_send_index);
+		req->rl_reply = NULL;
+	} else {
+		req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
+		buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
+	}
+	buffers->rb_send_bufs[buffers->rb_send_index++] = NULL;
+
+	INIT_LIST_HEAD(&stale);
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_FRMR:
+		req = rpcrdma_buffer_get_frmrs(req, buffers, &stale);
+		break;
+	case RPCRDMA_MTHCAFMR:
+		req = rpcrdma_buffer_get_fmrs(req, buffers);
+		break;
+	default:
+		break;
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+	if (!list_empty(&stale))
+		rpcrdma_retry_flushed_linv(&stale, buffers);
+	return req;
+}
+
+/*
+ * Put request/reply buffers back into pool.
+ * Pre-decrement counter/array index.
+ */
+void
+rpcrdma_buffer_put(struct rpcrdma_req *req)
+{
+	struct rpcrdma_buffer *buffers = req->rl_buffer;
+	struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
+	unsigned long flags;
+
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	rpcrdma_buffer_put_sendbuf(req, buffers);
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_FRMR:
+	case RPCRDMA_MTHCAFMR:
+		rpcrdma_buffer_put_mrs(req, buffers);
+		break;
+	default:
+		break;
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Recover reply buffers from pool.
+ * This happens when recovering from error conditions.
+ * Post-increment counter/array index.
+ */
+void
+rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
+{
+	struct rpcrdma_buffer *buffers = req->rl_buffer;
+	unsigned long flags;
+
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	if (buffers->rb_recv_index < buffers->rb_max_requests) {
+		req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
+		buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Put reply buffers back into pool when not attached to
+ * request. This happens in error conditions.
+ */
+void
+rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
+{
+	struct rpcrdma_buffer *buffers = rep->rr_buffer;
+	unsigned long flags;
+
+	rep->rr_func = NULL;
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep;
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Wrappers for internal-use kmalloc memory registration, used by buffer code.
+ */
+
+void
+rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
+{
+	dprintk("RPC:       map_one: offset %p iova %llx len %zu\n",
+		seg->mr_offset,
+		(unsigned long long)seg->mr_dma, seg->mr_dmalen);
+}
+
+static int
+rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
+				struct ib_mr **mrp, struct ib_sge *iov)
+{
+	struct ib_phys_buf ipb;
+	struct ib_mr *mr;
+	int rc;
+
+	/*
+	 * All memory passed here was kmalloc'ed, therefore phys-contiguous.
+	 */
+	iov->addr = ib_dma_map_single(ia->ri_id->device,
+			va, len, DMA_BIDIRECTIONAL);
+	if (ib_dma_mapping_error(ia->ri_id->device, iov->addr))
+		return -ENOMEM;
+
+	iov->length = len;
+
+	if (ia->ri_have_dma_lkey) {
+		*mrp = NULL;
+		iov->lkey = ia->ri_dma_lkey;
+		return 0;
+	} else if (ia->ri_bind_mem != NULL) {
+		*mrp = NULL;
+		iov->lkey = ia->ri_bind_mem->lkey;
+		return 0;
+	}
+
+	ipb.addr = iov->addr;
+	ipb.size = iov->length;
+	mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1,
+			IB_ACCESS_LOCAL_WRITE, &iov->addr);
+
+	dprintk("RPC:       %s: phys convert: 0x%llx "
+			"registered 0x%llx length %d\n",
+			__func__, (unsigned long long)ipb.addr,
+			(unsigned long long)iov->addr, len);
+
+	if (IS_ERR(mr)) {
+		*mrp = NULL;
+		rc = PTR_ERR(mr);
+		dprintk("RPC:       %s: failed with %i\n", __func__, rc);
+	} else {
+		*mrp = mr;
+		iov->lkey = mr->lkey;
+		rc = 0;
+	}
+
+	return rc;
+}
+
+static int
+rpcrdma_deregister_internal(struct rpcrdma_ia *ia,
+				struct ib_mr *mr, struct ib_sge *iov)
+{
+	int rc;
+
+	ib_dma_unmap_single(ia->ri_id->device,
+			iov->addr, iov->length, DMA_BIDIRECTIONAL);
+
+	if (NULL == mr)
+		return 0;
+
+	rc = ib_dereg_mr(mr);
+	if (rc)
+		dprintk("RPC:       %s: ib_dereg_mr failed %i\n", __func__, rc);
+	return rc;
+}
+
+/**
+ * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
+ * @ia: controlling rpcrdma_ia
+ * @size: size of buffer to be allocated, in bytes
+ * @flags: GFP flags
+ *
+ * Returns pointer to private header of an area of internally
+ * registered memory, or an ERR_PTR. The registered buffer follows
+ * the end of the private header.
+ *
+ * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
+ * receiving the payload of RDMA RECV operations. regbufs are not
+ * used for RDMA READ/WRITE operations, thus are registered only for
+ * LOCAL access.
+ */
+struct rpcrdma_regbuf *
+rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags)
+{
+	struct rpcrdma_regbuf *rb;
+	int rc;
+
+	rc = -ENOMEM;
+	rb = kmalloc(sizeof(*rb) + size, flags);
+	if (rb == NULL)
+		goto out;
+
+	rb->rg_size = size;
+	rb->rg_owner = NULL;
+	rc = rpcrdma_register_internal(ia, rb->rg_base, size,
+				       &rb->rg_mr, &rb->rg_iov);
+	if (rc)
+		goto out_free;
+
+	return rb;
+
+out_free:
+	kfree(rb);
+out:
+	return ERR_PTR(rc);
+}
+
+/**
+ * rpcrdma_free_regbuf - deregister and free registered buffer
+ * @ia: controlling rpcrdma_ia
+ * @rb: regbuf to be deregistered and freed
+ */
+void
+rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
+{
+	if (rb) {
+		rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov);
+		kfree(rb);
+	}
+}
+
+/*
+ * Prepost any receive buffer, then post send.
+ *
+ * Receive buffer is donated to hardware, reclaimed upon recv completion.
+ */
+int
+rpcrdma_ep_post(struct rpcrdma_ia *ia,
+		struct rpcrdma_ep *ep,
+		struct rpcrdma_req *req)
+{
+	struct ib_send_wr send_wr, *send_wr_fail;
+	struct rpcrdma_rep *rep = req->rl_reply;
+	int rc;
+
+	if (rep) {
+		rc = rpcrdma_ep_post_recv(ia, ep, rep);
+		if (rc)
+			goto out;
+		req->rl_reply = NULL;
+	}
+
+	send_wr.next = NULL;
+	send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION;
+	send_wr.sg_list = req->rl_send_iov;
+	send_wr.num_sge = req->rl_niovs;
+	send_wr.opcode = IB_WR_SEND;
+	if (send_wr.num_sge == 4)	/* no need to sync any pad (constant) */
+		ib_dma_sync_single_for_device(ia->ri_id->device,
+			req->rl_send_iov[3].addr, req->rl_send_iov[3].length,
+			DMA_TO_DEVICE);
+	ib_dma_sync_single_for_device(ia->ri_id->device,
+		req->rl_send_iov[1].addr, req->rl_send_iov[1].length,
+		DMA_TO_DEVICE);
+	ib_dma_sync_single_for_device(ia->ri_id->device,
+		req->rl_send_iov[0].addr, req->rl_send_iov[0].length,
+		DMA_TO_DEVICE);
+
+	if (DECR_CQCOUNT(ep) > 0)
+		send_wr.send_flags = 0;
+	else { /* Provider must take a send completion every now and then */
+		INIT_CQCOUNT(ep);
+		send_wr.send_flags = IB_SEND_SIGNALED;
+	}
+
+	rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
+	if (rc)
+		dprintk("RPC:       %s: ib_post_send returned %i\n", __func__,
+			rc);
+out:
+	return rc;
+}
+
+/*
+ * (Re)post a receive buffer.
+ */
+int
+rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
+		     struct rpcrdma_ep *ep,
+		     struct rpcrdma_rep *rep)
+{
+	struct ib_recv_wr recv_wr, *recv_wr_fail;
+	int rc;
+
+	recv_wr.next = NULL;
+	recv_wr.wr_id = (u64) (unsigned long) rep;
+	recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
+	recv_wr.num_sge = 1;
+
+	ib_dma_sync_single_for_cpu(ia->ri_id->device,
+				   rdmab_addr(rep->rr_rdmabuf),
+				   rdmab_length(rep->rr_rdmabuf),
+				   DMA_BIDIRECTIONAL);
+
+	rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
+
+	if (rc)
+		dprintk("RPC:       %s: ib_post_recv returned %i\n", __func__,
+			rc);
+	return rc;
+}
+
+/* How many chunk list items fit within our inline buffers?
+ */
+unsigned int
+rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+	int bytes, segments;
+
+	bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize);
+	bytes -= RPCRDMA_HDRLEN_MIN;
+	if (bytes < sizeof(struct rpcrdma_segment) * 2) {
+		pr_warn("RPC:       %s: inline threshold too small\n",
+			__func__);
+		return 0;
+	}
+
+	segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1);
+	dprintk("RPC:       %s: max chunk list size = %d segments\n",
+		__func__, segments);
+	return segments;
+}
diff --git a/kernel/net/sunrpc/xprtrdma/xprt_rdma.h b/kernel/net/sunrpc/xprtrdma/xprt_rdma.h
new file mode 100644
index 000000000..78e0b8bea
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -0,0 +1,496 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRT_RDMA_H
+#define _LINUX_SUNRPC_XPRT_RDMA_H
+
+#include <linux/wait.h> 		/* wait_queue_head_t, etc */
+#include <linux/spinlock.h> 		/* spinlock_t, etc */
+#include <linux/atomic.h>			/* atomic_t, etc */
+#include <linux/workqueue.h>		/* struct work_struct */
+
+#include <rdma/rdma_cm.h>		/* RDMA connection api */
+#include <rdma/ib_verbs.h>		/* RDMA verbs api */
+
+#include <linux/sunrpc/clnt.h> 		/* rpc_xprt */
+#include <linux/sunrpc/rpc_rdma.h> 	/* RPC/RDMA protocol */
+#include <linux/sunrpc/xprtrdma.h> 	/* xprt parameters */
+#include <linux/sunrpc/svc.h>		/* RPCSVC_MAXPAYLOAD */
+
+#define RDMA_RESOLVE_TIMEOUT	(5000)	/* 5 seconds */
+#define RDMA_CONNECT_RETRY_MAX	(2)	/* retries if no listener backlog */
+
+/*
+ * Interface Adapter -- one per transport instance
+ */
+struct rpcrdma_ia {
+	const struct rpcrdma_memreg_ops	*ri_ops;
+	rwlock_t		ri_qplock;
+	struct rdma_cm_id 	*ri_id;
+	struct ib_pd		*ri_pd;
+	struct ib_mr		*ri_bind_mem;
+	u32			ri_dma_lkey;
+	int			ri_have_dma_lkey;
+	struct completion	ri_done;
+	int			ri_async_rc;
+	enum rpcrdma_memreg	ri_memreg_strategy;
+	unsigned int		ri_max_frmr_depth;
+	struct ib_device_attr	ri_devattr;
+	struct ib_qp_attr	ri_qp_attr;
+	struct ib_qp_init_attr	ri_qp_init_attr;
+};
+
+/*
+ * RDMA Endpoint -- one per transport instance
+ */
+
+#define RPCRDMA_WC_BUDGET	(128)
+#define RPCRDMA_POLLSIZE	(16)
+
+struct rpcrdma_ep {
+	atomic_t		rep_cqcount;
+	int			rep_cqinit;
+	int			rep_connected;
+	struct ib_qp_init_attr	rep_attr;
+	wait_queue_head_t 	rep_connect_wait;
+	struct rpcrdma_regbuf	*rep_padbuf;
+	struct rdma_conn_param	rep_remote_cma;
+	struct sockaddr_storage	rep_remote_addr;
+	struct delayed_work	rep_connect_worker;
+	struct ib_wc		rep_send_wcs[RPCRDMA_POLLSIZE];
+	struct ib_wc		rep_recv_wcs[RPCRDMA_POLLSIZE];
+};
+
+/*
+ * Force a signaled SEND Work Request every so often,
+ * in case the provider needs to do some housekeeping.
+ */
+#define RPCRDMA_MAX_UNSIGNALED_SENDS	(32)
+
+#define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
+#define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
+
+/* Force completion handler to ignore the signal
+ */
+#define RPCRDMA_IGNORE_COMPLETION	(0ULL)
+
+/* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
+ *
+ * The below structure appears at the front of a large region of kmalloc'd
+ * memory, which always starts on a good alignment boundary.
+ */
+
+struct rpcrdma_regbuf {
+	size_t			rg_size;
+	struct rpcrdma_req	*rg_owner;
+	struct ib_mr		*rg_mr;
+	struct ib_sge		rg_iov;
+	__be32			rg_base[0] __attribute__ ((aligned(256)));
+};
+
+static inline u64
+rdmab_addr(struct rpcrdma_regbuf *rb)
+{
+	return rb->rg_iov.addr;
+}
+
+static inline u32
+rdmab_length(struct rpcrdma_regbuf *rb)
+{
+	return rb->rg_iov.length;
+}
+
+static inline u32
+rdmab_lkey(struct rpcrdma_regbuf *rb)
+{
+	return rb->rg_iov.lkey;
+}
+
+static inline struct rpcrdma_msg *
+rdmab_to_msg(struct rpcrdma_regbuf *rb)
+{
+	return (struct rpcrdma_msg *)rb->rg_base;
+}
+
+/*
+ * struct rpcrdma_rep -- this structure encapsulates state required to recv
+ * and complete a reply, asychronously. It needs several pieces of
+ * state:
+ *   o recv buffer (posted to provider)
+ *   o ib_sge (also donated to provider)
+ *   o status of reply (length, success or not)
+ *   o bookkeeping state to get run by tasklet (list, etc)
+ *
+ * These are allocated during initialization, per-transport instance;
+ * however, the tasklet execution list itself is global, as it should
+ * always be pretty short.
+ *
+ * N of these are associated with a transport instance, and stored in
+ * struct rpcrdma_buffer. N is the max number of outstanding requests.
+ */
+
+/* temporary static scatter/gather max */
+#define RPCRDMA_MAX_DATA_SEGS	(64)	/* max scatter/gather */
+#define RPCRDMA_MAX_SEGS 	(RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
+
+struct rpcrdma_buffer;
+
+struct rpcrdma_rep {
+	unsigned int		rr_len;
+	struct rpcrdma_buffer	*rr_buffer;
+	struct rpc_xprt		*rr_xprt;
+	void			(*rr_func)(struct rpcrdma_rep *);
+	struct list_head	rr_list;
+	struct rpcrdma_regbuf	*rr_rdmabuf;
+};
+
+/*
+ * struct rpcrdma_mw - external memory region metadata
+ *
+ * An external memory region is any buffer or page that is registered
+ * on the fly (ie, not pre-registered).
+ *
+ * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
+ * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
+ * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
+ * track of registration metadata while each RPC is pending.
+ * rpcrdma_deregister_external() uses this metadata to unmap and
+ * release these resources when an RPC is complete.
+ */
+enum rpcrdma_frmr_state {
+	FRMR_IS_INVALID,	/* ready to be used */
+	FRMR_IS_VALID,		/* in use */
+	FRMR_IS_STALE,		/* failed completion */
+};
+
+struct rpcrdma_frmr {
+	struct ib_fast_reg_page_list	*fr_pgl;
+	struct ib_mr			*fr_mr;
+	enum rpcrdma_frmr_state		fr_state;
+};
+
+struct rpcrdma_mw {
+	union {
+		struct ib_fmr		*fmr;
+		struct rpcrdma_frmr	frmr;
+	} r;
+	void			(*mw_sendcompletion)(struct ib_wc *);
+	struct list_head	mw_list;
+	struct list_head	mw_all;
+};
+
+/*
+ * struct rpcrdma_req -- structure central to the request/reply sequence.
+ *
+ * N of these are associated with a transport instance, and stored in
+ * struct rpcrdma_buffer. N is the max number of outstanding requests.
+ *
+ * It includes pre-registered buffer memory for send AND recv.
+ * The recv buffer, however, is not owned by this structure, and
+ * is "donated" to the hardware when a recv is posted. When a
+ * reply is handled, the recv buffer used is given back to the
+ * struct rpcrdma_req associated with the request.
+ *
+ * In addition to the basic memory, this structure includes an array
+ * of iovs for send operations. The reason is that the iovs passed to
+ * ib_post_{send,recv} must not be modified until the work request
+ * completes.
+ *
+ * NOTES:
+ *   o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
+ *     marshal. The number needed varies depending on the iov lists that
+ *     are passed to us, the memory registration mode we are in, and if
+ *     physical addressing is used, the layout.
+ */
+
+struct rpcrdma_mr_seg {		/* chunk descriptors */
+	struct rpcrdma_mw *rl_mw;	/* registered MR */
+	u64		mr_base;	/* registration result */
+	u32		mr_rkey;	/* registration result */
+	u32		mr_len;		/* length of chunk or segment */
+	int		mr_nsegs;	/* number of segments in chunk or 0 */
+	enum dma_data_direction	mr_dir;	/* segment mapping direction */
+	dma_addr_t	mr_dma;		/* segment mapping address */
+	size_t		mr_dmalen;	/* segment mapping length */
+	struct page	*mr_page;	/* owning page, if any */
+	char		*mr_offset;	/* kva if no page, else offset */
+};
+
+struct rpcrdma_req {
+	unsigned int	rl_niovs;	/* 0, 2 or 4 */
+	unsigned int	rl_nchunks;	/* non-zero if chunks */
+	unsigned int	rl_connect_cookie;	/* retry detection */
+	struct rpcrdma_buffer *rl_buffer; /* home base for this structure */
+	struct rpcrdma_rep	*rl_reply;/* holder for reply buffer */
+	struct ib_sge	rl_send_iov[4];	/* for active requests */
+	struct rpcrdma_regbuf *rl_rdmabuf;
+	struct rpcrdma_regbuf *rl_sendbuf;
+	struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
+};
+
+static inline struct rpcrdma_req *
+rpcr_to_rdmar(struct rpc_rqst *rqst)
+{
+	void *buffer = rqst->rq_buffer;
+	struct rpcrdma_regbuf *rb;
+
+	rb = container_of(buffer, struct rpcrdma_regbuf, rg_base);
+	return rb->rg_owner;
+}
+
+/*
+ * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
+ * inline requests/replies, and client/server credits.
+ *
+ * One of these is associated with a transport instance
+ */
+struct rpcrdma_buffer {
+	spinlock_t	rb_lock;	/* protects indexes */
+	u32		rb_max_requests;/* client max requests */
+	struct list_head rb_mws;	/* optional memory windows/fmrs/frmrs */
+	struct list_head rb_all;
+	int		rb_send_index;
+	struct rpcrdma_req	**rb_send_bufs;
+	int		rb_recv_index;
+	struct rpcrdma_rep	**rb_recv_bufs;
+	char		*rb_pool;
+};
+#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
+
+/*
+ * Internal structure for transport instance creation. This
+ * exists primarily for modularity.
+ *
+ * This data should be set with mount options
+ */
+struct rpcrdma_create_data_internal {
+	struct sockaddr_storage	addr;	/* RDMA server address */
+	unsigned int	max_requests;	/* max requests (slots) in flight */
+	unsigned int	rsize;		/* mount rsize - max read hdr+data */
+	unsigned int	wsize;		/* mount wsize - max write hdr+data */
+	unsigned int	inline_rsize;	/* max non-rdma read data payload */
+	unsigned int	inline_wsize;	/* max non-rdma write data payload */
+	unsigned int	padding;	/* non-rdma write header padding */
+};
+
+#define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
+	(rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
+
+#define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
+	(rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
+
+#define RPCRDMA_INLINE_PAD_VALUE(rq)\
+	rpcx_to_rdmad(rq->rq_xprt).padding
+
+/*
+ * Statistics for RPCRDMA
+ */
+struct rpcrdma_stats {
+	unsigned long		read_chunk_count;
+	unsigned long		write_chunk_count;
+	unsigned long		reply_chunk_count;
+
+	unsigned long long	total_rdma_request;
+	unsigned long long	total_rdma_reply;
+
+	unsigned long long	pullup_copy_count;
+	unsigned long long	fixup_copy_count;
+	unsigned long		hardway_register_count;
+	unsigned long		failed_marshal_count;
+	unsigned long		bad_reply_count;
+};
+
+/*
+ * Per-registration mode operations
+ */
+struct rpcrdma_xprt;
+struct rpcrdma_memreg_ops {
+	int		(*ro_map)(struct rpcrdma_xprt *,
+				  struct rpcrdma_mr_seg *, int, bool);
+	int		(*ro_unmap)(struct rpcrdma_xprt *,
+				    struct rpcrdma_mr_seg *);
+	int		(*ro_open)(struct rpcrdma_ia *,
+				   struct rpcrdma_ep *,
+				   struct rpcrdma_create_data_internal *);
+	size_t		(*ro_maxpages)(struct rpcrdma_xprt *);
+	int		(*ro_init)(struct rpcrdma_xprt *);
+	void		(*ro_reset)(struct rpcrdma_xprt *);
+	void		(*ro_destroy)(struct rpcrdma_buffer *);
+	const char	*ro_displayname;
+};
+
+extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
+extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
+extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops;
+
+/*
+ * RPCRDMA transport -- encapsulates the structures above for
+ * integration with RPC.
+ *
+ * The contained structures are embedded, not pointers,
+ * for convenience. This structure need not be visible externally.
+ *
+ * It is allocated and initialized during mount, and released
+ * during unmount.
+ */
+struct rpcrdma_xprt {
+	struct rpc_xprt		rx_xprt;
+	struct rpcrdma_ia	rx_ia;
+	struct rpcrdma_ep	rx_ep;
+	struct rpcrdma_buffer	rx_buf;
+	struct rpcrdma_create_data_internal rx_data;
+	struct delayed_work	rx_connect_worker;
+	struct rpcrdma_stats	rx_stats;
+};
+
+#define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
+#define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
+
+/* Setting this to 0 ensures interoperability with early servers.
+ * Setting this to 1 enhances certain unaligned read/write performance.
+ * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
+extern int xprt_rdma_pad_optimize;
+
+/*
+ * Interface Adapter calls - xprtrdma/verbs.c
+ */
+int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
+void rpcrdma_ia_close(struct rpcrdma_ia *);
+
+/*
+ * Endpoint calls - xprtrdma/verbs.c
+ */
+int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
+				struct rpcrdma_create_data_internal *);
+void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
+int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
+void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
+
+int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
+				struct rpcrdma_req *);
+int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
+				struct rpcrdma_rep *);
+
+/*
+ * Buffer calls - xprtrdma/verbs.c
+ */
+int rpcrdma_buffer_create(struct rpcrdma_xprt *);
+void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
+
+struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
+void rpcrdma_buffer_put(struct rpcrdma_req *);
+void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
+void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
+
+struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
+					    size_t, gfp_t);
+void rpcrdma_free_regbuf(struct rpcrdma_ia *,
+			 struct rpcrdma_regbuf *);
+
+unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *);
+
+/*
+ * Wrappers for chunk registration, shared by read/write chunk code.
+ */
+
+void rpcrdma_mapping_error(struct rpcrdma_mr_seg *);
+
+static inline enum dma_data_direction
+rpcrdma_data_dir(bool writing)
+{
+	return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+}
+
+static inline void
+rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg,
+		enum dma_data_direction direction)
+{
+	seg->mr_dir = direction;
+	seg->mr_dmalen = seg->mr_len;
+
+	if (seg->mr_page)
+		seg->mr_dma = ib_dma_map_page(device,
+				seg->mr_page, offset_in_page(seg->mr_offset),
+				seg->mr_dmalen, seg->mr_dir);
+	else
+		seg->mr_dma = ib_dma_map_single(device,
+				seg->mr_offset,
+				seg->mr_dmalen, seg->mr_dir);
+
+	if (ib_dma_mapping_error(device, seg->mr_dma))
+		rpcrdma_mapping_error(seg);
+}
+
+static inline void
+rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg)
+{
+	if (seg->mr_page)
+		ib_dma_unmap_page(device,
+				  seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
+	else
+		ib_dma_unmap_single(device,
+				    seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
+}
+
+/*
+ * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
+ */
+void rpcrdma_connect_worker(struct work_struct *);
+void rpcrdma_conn_func(struct rpcrdma_ep *);
+void rpcrdma_reply_handler(struct rpcrdma_rep *);
+
+/*
+ * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
+ */
+int rpcrdma_marshal_req(struct rpc_rqst *);
+
+/* Temporary NFS request map cache. Created in svc_rdma.c  */
+extern struct kmem_cache *svc_rdma_map_cachep;
+/* WR context cache. Created in svc_rdma.c  */
+extern struct kmem_cache *svc_rdma_ctxt_cachep;
+/* Workqueue created in svc_rdma.c */
+extern struct workqueue_struct *svc_rdma_wq;
+
+#if RPCSVC_MAXPAYLOAD < (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT)
+#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
+#else
+#define RPCSVC_MAXPAYLOAD_RDMA (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT)
+#endif
+
+#endif				/* _LINUX_SUNRPC_XPRT_RDMA_H */
diff --git a/kernel/net/sunrpc/xprtsock.c b/kernel/net/sunrpc/xprtsock.c
new file mode 100644
index 000000000..66891e32c
--- /dev/null
+++ b/kernel/net/sunrpc/xprtsock.c
@@ -0,0 +1,3034 @@
+/*
+ * linux/net/sunrpc/xprtsock.c
+ *
+ * Client-side transport implementation for sockets.
+ *
+ * TCP callback races fixes (C) 1998 Red Hat
+ * TCP send fixes (C) 1998 Red Hat
+ * TCP NFS related read + write fixes
+ *  (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
+ *
+ * Rewrite of larges part of the code in order to stabilize TCP stuff.
+ * Fix behaviour when socket buffer is full.
+ *  (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
+ *
+ * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
+ *   <gilles.quillard@bull.net>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/mm.h>
+#include <linux/un.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/file.h>
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+#include <linux/sunrpc/bc_xprt.h>
+#endif
+
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+
+#include <trace/events/sunrpc.h>
+
+#include "sunrpc.h"
+
+static void xs_close(struct rpc_xprt *xprt);
+
+/*
+ * xprtsock tunables
+ */
+static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
+static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
+
+static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
+static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+
+#define XS_TCP_LINGER_TO	(15U * HZ)
+static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
+
+/*
+ * We can register our own files under /proc/sys/sunrpc by
+ * calling register_sysctl_table() again.  The files in that
+ * directory become the union of all files registered there.
+ *
+ * We simply need to make sure that we don't collide with
+ * someone else's file names!
+ */
+
+static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
+static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
+static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
+static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+/*
+ * FIXME: changing the UDP slot table size should also resize the UDP
+ *        socket buffers for existing UDP transports
+ */
+static struct ctl_table xs_tunables_table[] = {
+	{
+		.procname	= "udp_slot_table_entries",
+		.data		= &xprt_udp_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.procname	= "tcp_slot_table_entries",
+		.data		= &xprt_tcp_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.procname	= "tcp_max_slot_table_entries",
+		.data		= &xprt_max_tcp_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_tcp_slot_table_limit
+	},
+	{
+		.procname	= "min_resvport",
+		.data		= &xprt_min_resvport,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &xprt_min_resvport_limit,
+		.extra2		= &xprt_max_resvport_limit
+	},
+	{
+		.procname	= "max_resvport",
+		.data		= &xprt_max_resvport,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &xprt_min_resvport_limit,
+		.extra2		= &xprt_max_resvport_limit
+	},
+	{
+		.procname	= "tcp_fin_timeout",
+		.data		= &xs_tcp_fin_timeout,
+		.maxlen		= sizeof(xs_tcp_fin_timeout),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_jiffies,
+	},
+	{ },
+};
+
+static struct ctl_table sunrpc_table[] = {
+	{
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= xs_tunables_table
+	},
+	{ },
+};
+
+#endif
+
+/*
+ * Wait duration for a reply from the RPC portmapper.
+ */
+#define XS_BIND_TO		(60U * HZ)
+
+/*
+ * Delay if a UDP socket connect error occurs.  This is most likely some
+ * kind of resource problem on the local host.
+ */
+#define XS_UDP_REEST_TO		(2U * HZ)
+
+/*
+ * The reestablish timeout allows clients to delay for a bit before attempting
+ * to reconnect to a server that just dropped our connection.
+ *
+ * We implement an exponential backoff when trying to reestablish a TCP
+ * transport connection with the server.  Some servers like to drop a TCP
+ * connection when they are overworked, so we start with a short timeout and
+ * increase over time if the server is down or not responding.
+ */
+#define XS_TCP_INIT_REEST_TO	(3U * HZ)
+#define XS_TCP_MAX_REEST_TO	(5U * 60 * HZ)
+
+/*
+ * TCP idle timeout; client drops the transport socket if it is idle
+ * for this long.  Note that we also timeout UDP sockets to prevent
+ * holding port numbers when there is no RPC traffic.
+ */
+#define XS_IDLE_DISC_TO		(5U * 60 * HZ)
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# undef  RPC_DEBUG_DATA
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+#ifdef RPC_DEBUG_DATA
+static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+	u8 *buf = (u8 *) packet;
+	int j;
+
+	dprintk("RPC:       %s\n", msg);
+	for (j = 0; j < count && j < 128; j += 4) {
+		if (!(j & 31)) {
+			if (j)
+				dprintk("\n");
+			dprintk("0x%04x ", j);
+		}
+		dprintk("%02x%02x%02x%02x ",
+			buf[j], buf[j+1], buf[j+2], buf[j+3]);
+	}
+	dprintk("\n");
+}
+#else
+static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+	/* NOP */
+}
+#endif
+
+static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
+{
+	return (struct rpc_xprt *) sk->sk_user_data;
+}
+
+static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr *) &xprt->addr;
+}
+
+static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_un *) &xprt->addr;
+}
+
+static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in *) &xprt->addr;
+}
+
+static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in6 *) &xprt->addr;
+}
+
+static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
+{
+	struct sockaddr *sap = xs_addr(xprt);
+	struct sockaddr_in6 *sin6;
+	struct sockaddr_in *sin;
+	struct sockaddr_un *sun;
+	char buf[128];
+
+	switch (sap->sa_family) {
+	case AF_LOCAL:
+		sun = xs_addr_un(xprt);
+		strlcpy(buf, sun->sun_path, sizeof(buf));
+		xprt->address_strings[RPC_DISPLAY_ADDR] =
+						kstrdup(buf, GFP_KERNEL);
+		break;
+	case AF_INET:
+		(void)rpc_ntop(sap, buf, sizeof(buf));
+		xprt->address_strings[RPC_DISPLAY_ADDR] =
+						kstrdup(buf, GFP_KERNEL);
+		sin = xs_addr_in(xprt);
+		snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
+		break;
+	case AF_INET6:
+		(void)rpc_ntop(sap, buf, sizeof(buf));
+		xprt->address_strings[RPC_DISPLAY_ADDR] =
+						kstrdup(buf, GFP_KERNEL);
+		sin6 = xs_addr_in6(xprt);
+		snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
+		break;
+	default:
+		BUG();
+	}
+
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
+{
+	struct sockaddr *sap = xs_addr(xprt);
+	char buf[128];
+
+	snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
+	xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
+
+	snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_peer_addresses(struct rpc_xprt *xprt,
+				     const char *protocol,
+				     const char *netid)
+{
+	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
+	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
+	xs_format_common_peer_addresses(xprt);
+	xs_format_common_peer_ports(xprt);
+}
+
+static void xs_update_peer_port(struct rpc_xprt *xprt)
+{
+	kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
+	kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
+
+	xs_format_common_peer_ports(xprt);
+}
+
+static void xs_free_peer_addresses(struct rpc_xprt *xprt)
+{
+	unsigned int i;
+
+	for (i = 0; i < RPC_DISPLAY_MAX; i++)
+		switch (i) {
+		case RPC_DISPLAY_PROTO:
+		case RPC_DISPLAY_NETID:
+			continue;
+		default:
+			kfree(xprt->address_strings[i]);
+		}
+}
+
+#define XS_SENDMSG_FLAGS	(MSG_DONTWAIT | MSG_NOSIGNAL)
+
+static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
+{
+	struct msghdr msg = {
+		.msg_name	= addr,
+		.msg_namelen	= addrlen,
+		.msg_flags	= XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
+	};
+	struct kvec iov = {
+		.iov_base	= vec->iov_base + base,
+		.iov_len	= vec->iov_len - base,
+	};
+
+	if (iov.iov_len != 0)
+		return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
+	return kernel_sendmsg(sock, &msg, NULL, 0, 0);
+}
+
+static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
+{
+	ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
+			int offset, size_t size, int flags);
+	struct page **ppage;
+	unsigned int remainder;
+	int err;
+
+	remainder = xdr->page_len - base;
+	base += xdr->page_base;
+	ppage = xdr->pages + (base >> PAGE_SHIFT);
+	base &= ~PAGE_MASK;
+	do_sendpage = sock->ops->sendpage;
+	if (!zerocopy)
+		do_sendpage = sock_no_sendpage;
+	for(;;) {
+		unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
+		int flags = XS_SENDMSG_FLAGS;
+
+		remainder -= len;
+		if (remainder != 0 || more)
+			flags |= MSG_MORE;
+		err = do_sendpage(sock, *ppage, base, len, flags);
+		if (remainder == 0 || err != len)
+			break;
+		*sent_p += err;
+		ppage++;
+		base = 0;
+	}
+	if (err > 0) {
+		*sent_p += err;
+		err = 0;
+	}
+	return err;
+}
+
+/**
+ * xs_sendpages - write pages directly to a socket
+ * @sock: socket to send on
+ * @addr: UDP only -- address of destination
+ * @addrlen: UDP only -- length of destination address
+ * @xdr: buffer containing this request
+ * @base: starting position in the buffer
+ * @zerocopy: true if it is safe to use sendpage()
+ * @sent_p: return the total number of bytes successfully queued for sending
+ *
+ */
+static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
+{
+	unsigned int remainder = xdr->len - base;
+	int err = 0;
+	int sent = 0;
+
+	if (unlikely(!sock))
+		return -ENOTSOCK;
+
+	clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
+	if (base != 0) {
+		addr = NULL;
+		addrlen = 0;
+	}
+
+	if (base < xdr->head[0].iov_len || addr != NULL) {
+		unsigned int len = xdr->head[0].iov_len - base;
+		remainder -= len;
+		err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
+		if (remainder == 0 || err != len)
+			goto out;
+		*sent_p += err;
+		base = 0;
+	} else
+		base -= xdr->head[0].iov_len;
+
+	if (base < xdr->page_len) {
+		unsigned int len = xdr->page_len - base;
+		remainder -= len;
+		err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
+		*sent_p += sent;
+		if (remainder == 0 || sent != len)
+			goto out;
+		base = 0;
+	} else
+		base -= xdr->page_len;
+
+	if (base >= xdr->tail[0].iov_len)
+		return 0;
+	err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
+out:
+	if (err > 0) {
+		*sent_p += err;
+		err = 0;
+	}
+	return err;
+}
+
+static void xs_nospace_callback(struct rpc_task *task)
+{
+	struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
+
+	transport->inet->sk_write_pending--;
+	clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+}
+
+/**
+ * xs_nospace - place task on wait queue if transmit was incomplete
+ * @task: task to put to sleep
+ *
+ */
+static int xs_nospace(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct sock *sk = transport->inet;
+	int ret = -EAGAIN;
+
+	dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
+			task->tk_pid, req->rq_slen - req->rq_bytes_sent,
+			req->rq_slen);
+
+	/* Protect against races with write_space */
+	spin_lock_bh(&xprt->transport_lock);
+
+	/* Don't race with disconnect */
+	if (xprt_connected(xprt)) {
+		if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
+			/*
+			 * Notify TCP that we're limited by the application
+			 * window size
+			 */
+			set_bit(SOCK_NOSPACE, &transport->sock->flags);
+			sk->sk_write_pending++;
+			/* ...and wait for more buffer space */
+			xprt_wait_for_buffer_space(task, xs_nospace_callback);
+		}
+	} else {
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		ret = -ENOTCONN;
+	}
+
+	spin_unlock_bh(&xprt->transport_lock);
+
+	/* Race breaker in case memory is freed before above code is called */
+	sk->sk_write_space(sk);
+	return ret;
+}
+
+/*
+ * Construct a stream transport record marker in @buf.
+ */
+static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
+{
+	u32 reclen = buf->len - sizeof(rpc_fraghdr);
+	rpc_fraghdr *base = buf->head[0].iov_base;
+	*base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
+}
+
+/**
+ * xs_local_send_request - write an RPC request to an AF_LOCAL socket
+ * @task: RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ *        0:	The request has been sent
+ *   EAGAIN:	The socket was blocked, please call again later to
+ *		complete the request
+ * ENOTCONN:	Caller needs to invoke connect logic then call again
+ *    other:	Some other error occured, the request was not sent
+ */
+static int xs_local_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *xdr = &req->rq_snd_buf;
+	int status;
+	int sent = 0;
+
+	xs_encode_stream_record_marker(&req->rq_snd_buf);
+
+	xs_pktdump("packet data:",
+			req->rq_svec->iov_base, req->rq_svec->iov_len);
+
+	status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
+			      true, &sent);
+	dprintk("RPC:       %s(%u) = %d\n",
+			__func__, xdr->len - req->rq_bytes_sent, status);
+	if (likely(sent > 0) || status == 0) {
+		req->rq_bytes_sent += sent;
+		req->rq_xmit_bytes_sent += sent;
+		if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+			req->rq_bytes_sent = 0;
+			return 0;
+		}
+		status = -EAGAIN;
+	}
+
+	switch (status) {
+	case -ENOBUFS:
+	case -EAGAIN:
+		status = xs_nospace(task);
+		break;
+	default:
+		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
+			-status);
+	case -EPIPE:
+		xs_close(xprt);
+		status = -ENOTCONN;
+	}
+
+	return status;
+}
+
+/**
+ * xs_udp_send_request - write an RPC request to a UDP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ *        0:	The request has been sent
+ *   EAGAIN:	The socket was blocked, please call again later to
+ *		complete the request
+ * ENOTCONN:	Caller needs to invoke connect logic then call again
+ *    other:	Some other error occurred, the request was not sent
+ */
+static int xs_udp_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *xdr = &req->rq_snd_buf;
+	int sent = 0;
+	int status;
+
+	xs_pktdump("packet data:",
+				req->rq_svec->iov_base,
+				req->rq_svec->iov_len);
+
+	if (!xprt_bound(xprt))
+		return -ENOTCONN;
+	status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
+			      xdr, req->rq_bytes_sent, true, &sent);
+
+	dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
+			xdr->len - req->rq_bytes_sent, status);
+
+	/* firewall is blocking us, don't return -EAGAIN or we end up looping */
+	if (status == -EPERM)
+		goto process_status;
+
+	if (sent > 0 || status == 0) {
+		req->rq_xmit_bytes_sent += sent;
+		if (sent >= req->rq_slen)
+			return 0;
+		/* Still some bytes left; set up for a retry later. */
+		status = -EAGAIN;
+	}
+
+process_status:
+	switch (status) {
+	case -ENOTSOCK:
+		status = -ENOTCONN;
+		/* Should we call xs_close() here? */
+		break;
+	case -EAGAIN:
+		status = xs_nospace(task);
+		break;
+	default:
+		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
+			-status);
+	case -ENETUNREACH:
+	case -ENOBUFS:
+	case -EPIPE:
+	case -ECONNREFUSED:
+	case -EPERM:
+		/* When the server has died, an ICMP port unreachable message
+		 * prompts ECONNREFUSED. */
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+	}
+
+	return status;
+}
+
+/**
+ * xs_tcp_shutdown - gracefully shut down a TCP socket
+ * @xprt: transport
+ *
+ * Initiates a graceful shutdown of the TCP socket by calling the
+ * equivalent of shutdown(SHUT_RDWR);
+ */
+static void xs_tcp_shutdown(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct socket *sock = transport->sock;
+
+	if (sock != NULL) {
+		kernel_sock_shutdown(sock, SHUT_RDWR);
+		trace_rpc_socket_shutdown(xprt, sock);
+	}
+}
+
+/**
+ * xs_tcp_send_request - write an RPC request to a TCP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ *        0:	The request has been sent
+ *   EAGAIN:	The socket was blocked, please call again later to
+ *		complete the request
+ * ENOTCONN:	Caller needs to invoke connect logic then call again
+ *    other:	Some other error occurred, the request was not sent
+ *
+ * XXX: In the case of soft timeouts, should we eventually give up
+ *	if sendmsg is not able to make progress?
+ */
+static int xs_tcp_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *xdr = &req->rq_snd_buf;
+	bool zerocopy = true;
+	int status;
+	int sent;
+
+	xs_encode_stream_record_marker(&req->rq_snd_buf);
+
+	xs_pktdump("packet data:",
+				req->rq_svec->iov_base,
+				req->rq_svec->iov_len);
+	/* Don't use zero copy if this is a resend. If the RPC call
+	 * completes while the socket holds a reference to the pages,
+	 * then we may end up resending corrupted data.
+	 */
+	if (task->tk_flags & RPC_TASK_SENT)
+		zerocopy = false;
+
+	/* Continue transmitting the packet/record. We must be careful
+	 * to cope with writespace callbacks arriving _after_ we have
+	 * called sendmsg(). */
+	while (1) {
+		sent = 0;
+		status = xs_sendpages(transport->sock, NULL, 0, xdr,
+				      req->rq_bytes_sent, zerocopy, &sent);
+
+		dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
+				xdr->len - req->rq_bytes_sent, status);
+
+		if (unlikely(sent == 0 && status < 0))
+			break;
+
+		/* If we've sent the entire packet, immediately
+		 * reset the count of bytes sent. */
+		req->rq_bytes_sent += sent;
+		req->rq_xmit_bytes_sent += sent;
+		if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+			req->rq_bytes_sent = 0;
+			return 0;
+		}
+
+		if (sent != 0)
+			continue;
+		status = -EAGAIN;
+		break;
+	}
+
+	switch (status) {
+	case -ENOTSOCK:
+		status = -ENOTCONN;
+		/* Should we call xs_close() here? */
+		break;
+	case -ENOBUFS:
+	case -EAGAIN:
+		status = xs_nospace(task);
+		break;
+	default:
+		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
+			-status);
+	case -ECONNRESET:
+	case -ECONNREFUSED:
+	case -ENOTCONN:
+	case -EADDRINUSE:
+	case -EPIPE:
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+	}
+
+	return status;
+}
+
+/**
+ * xs_tcp_release_xprt - clean up after a tcp transmission
+ * @xprt: transport
+ * @task: rpc task
+ *
+ * This cleans up if an error causes us to abort the transmission of a request.
+ * In this case, the socket may need to be reset in order to avoid confusing
+ * the server.
+ */
+static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req;
+
+	if (task != xprt->snd_task)
+		return;
+	if (task == NULL)
+		goto out_release;
+	req = task->tk_rqstp;
+	if (req == NULL)
+		goto out_release;
+	if (req->rq_bytes_sent == 0)
+		goto out_release;
+	if (req->rq_bytes_sent == req->rq_snd_buf.len)
+		goto out_release;
+	set_bit(XPRT_CLOSE_WAIT, &xprt->state);
+out_release:
+	xprt_release_xprt(xprt, task);
+}
+
+static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+	transport->old_data_ready = sk->sk_data_ready;
+	transport->old_state_change = sk->sk_state_change;
+	transport->old_write_space = sk->sk_write_space;
+	transport->old_error_report = sk->sk_error_report;
+}
+
+static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+	sk->sk_data_ready = transport->old_data_ready;
+	sk->sk_state_change = transport->old_state_change;
+	sk->sk_write_space = transport->old_write_space;
+	sk->sk_error_report = transport->old_error_report;
+}
+
+static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
+{
+	smp_mb__before_atomic();
+	clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+	clear_bit(XPRT_CLOSING, &xprt->state);
+	smp_mb__after_atomic();
+}
+
+static void xs_sock_mark_closed(struct rpc_xprt *xprt)
+{
+	xs_sock_reset_connection_flags(xprt);
+	/* Mark transport as closed and wake up all pending tasks */
+	xprt_disconnect_done(xprt);
+}
+
+/**
+ * xs_error_report - callback to handle TCP socket state errors
+ * @sk: socket
+ *
+ * Note: we don't call sock_error() since there may be a rpc_task
+ * using the socket, and so we don't want to clear sk->sk_err.
+ */
+static void xs_error_report(struct sock *sk)
+{
+	struct rpc_xprt *xprt;
+	int err;
+
+	read_lock_bh(&sk->sk_callback_lock);
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+
+	err = -sk->sk_err;
+	if (err == 0)
+		goto out;
+	/* Is this a reset event? */
+	if (sk->sk_state == TCP_CLOSE)
+		xs_sock_mark_closed(xprt);
+	dprintk("RPC:       xs_error_report client %p, error=%d...\n",
+			xprt, -err);
+	trace_rpc_socket_error(xprt, sk->sk_socket, err);
+	xprt_wake_pending_tasks(xprt, err);
+ out:
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_reset_transport(struct sock_xprt *transport)
+{
+	struct socket *sock = transport->sock;
+	struct sock *sk = transport->inet;
+	struct rpc_xprt *xprt = &transport->xprt;
+
+	if (sk == NULL)
+		return;
+
+	write_lock_bh(&sk->sk_callback_lock);
+	transport->inet = NULL;
+	transport->sock = NULL;
+
+	sk->sk_user_data = NULL;
+
+	xs_restore_old_callbacks(transport, sk);
+	write_unlock_bh(&sk->sk_callback_lock);
+	xs_sock_reset_connection_flags(xprt);
+
+	trace_rpc_socket_close(xprt, sock);
+	sock_release(sock);
+}
+
+/**
+ * xs_close - close a socket
+ * @xprt: transport
+ *
+ * This is used when all requests are complete; ie, no DRC state remains
+ * on the server we want to save.
+ *
+ * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
+ * xs_reset_transport() zeroing the socket from underneath a writer.
+ */
+static void xs_close(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	dprintk("RPC:       xs_close xprt %p\n", xprt);
+
+	xs_reset_transport(transport);
+	xprt->reestablish_timeout = 0;
+
+	xprt_disconnect_done(xprt);
+}
+
+static void xs_xprt_free(struct rpc_xprt *xprt)
+{
+	xs_free_peer_addresses(xprt);
+	xprt_free(xprt);
+}
+
+/**
+ * xs_destroy - prepare to shutdown a transport
+ * @xprt: doomed transport
+ *
+ */
+static void xs_destroy(struct rpc_xprt *xprt)
+{
+	dprintk("RPC:       xs_destroy xprt %p\n", xprt);
+
+	xs_close(xprt);
+	xs_xprt_free(xprt);
+	module_put(THIS_MODULE);
+}
+
+static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
+{
+	struct xdr_skb_reader desc = {
+		.skb		= skb,
+		.offset		= sizeof(rpc_fraghdr),
+		.count		= skb->len - sizeof(rpc_fraghdr),
+	};
+
+	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
+		return -1;
+	if (desc.count)
+		return -1;
+	return 0;
+}
+
+/**
+ * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
+ * @sk: socket with data to read
+ * @len: how much data to read
+ *
+ * Currently this assumes we can read the whole reply in a single gulp.
+ */
+static void xs_local_data_ready(struct sock *sk)
+{
+	struct rpc_task *task;
+	struct rpc_xprt *xprt;
+	struct rpc_rqst *rovr;
+	struct sk_buff *skb;
+	int err, repsize, copied;
+	u32 _xid;
+	__be32 *xp;
+
+	read_lock_bh(&sk->sk_callback_lock);
+	dprintk("RPC:       %s...\n", __func__);
+	xprt = xprt_from_sock(sk);
+	if (xprt == NULL)
+		goto out;
+
+	skb = skb_recv_datagram(sk, 0, 1, &err);
+	if (skb == NULL)
+		goto out;
+
+	repsize = skb->len - sizeof(rpc_fraghdr);
+	if (repsize < 4) {
+		dprintk("RPC:       impossible RPC reply size %d\n", repsize);
+		goto dropit;
+	}
+
+	/* Copy the XID from the skb... */
+	xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
+	if (xp == NULL)
+		goto dropit;
+
+	/* Look up and lock the request corresponding to the given XID */
+	spin_lock(&xprt->transport_lock);
+	rovr = xprt_lookup_rqst(xprt, *xp);
+	if (!rovr)
+		goto out_unlock;
+	task = rovr->rq_task;
+
+	copied = rovr->rq_private_buf.buflen;
+	if (copied > repsize)
+		copied = repsize;
+
+	if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
+		dprintk("RPC:       sk_buff copy failed\n");
+		goto out_unlock;
+	}
+
+	xprt_complete_rqst(task, copied);
+
+ out_unlock:
+	spin_unlock(&xprt->transport_lock);
+ dropit:
+	skb_free_datagram(sk, skb);
+ out:
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_udp_data_ready - "data ready" callback for UDP sockets
+ * @sk: socket with data to read
+ * @len: how much data to read
+ *
+ */
+static void xs_udp_data_ready(struct sock *sk)
+{
+	struct rpc_task *task;
+	struct rpc_xprt *xprt;
+	struct rpc_rqst *rovr;
+	struct sk_buff *skb;
+	int err, repsize, copied;
+	u32 _xid;
+	__be32 *xp;
+
+	read_lock_bh(&sk->sk_callback_lock);
+	dprintk("RPC:       xs_udp_data_ready...\n");
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+
+	if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
+		goto out;
+
+	repsize = skb->len - sizeof(struct udphdr);
+	if (repsize < 4) {
+		dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
+		goto dropit;
+	}
+
+	/* Copy the XID from the skb... */
+	xp = skb_header_pointer(skb, sizeof(struct udphdr),
+				sizeof(_xid), &_xid);
+	if (xp == NULL)
+		goto dropit;
+
+	/* Look up and lock the request corresponding to the given XID */
+	spin_lock(&xprt->transport_lock);
+	rovr = xprt_lookup_rqst(xprt, *xp);
+	if (!rovr)
+		goto out_unlock;
+	task = rovr->rq_task;
+
+	if ((copied = rovr->rq_private_buf.buflen) > repsize)
+		copied = repsize;
+
+	/* Suck it into the iovec, verify checksum if not done by hw. */
+	if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
+		UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
+		goto out_unlock;
+	}
+
+	UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
+
+	xprt_adjust_cwnd(xprt, task, copied);
+	xprt_complete_rqst(task, copied);
+
+ out_unlock:
+	spin_unlock(&xprt->transport_lock);
+ dropit:
+	skb_free_datagram(sk, skb);
+ out:
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/*
+ * Helper function to force a TCP close if the server is sending
+ * junk and/or it has put us in CLOSE_WAIT
+ */
+static void xs_tcp_force_close(struct rpc_xprt *xprt)
+{
+	xprt_force_disconnect(xprt);
+}
+
+static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	size_t len, used;
+	char *p;
+
+	p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
+	len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
+	used = xdr_skb_read_bits(desc, p, len);
+	transport->tcp_offset += used;
+	if (used != len)
+		return;
+
+	transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
+	if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
+		transport->tcp_flags |= TCP_RCV_LAST_FRAG;
+	else
+		transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
+	transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
+
+	transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
+	transport->tcp_offset = 0;
+
+	/* Sanity check of the record length */
+	if (unlikely(transport->tcp_reclen < 8)) {
+		dprintk("RPC:       invalid TCP record fragment length\n");
+		xs_tcp_force_close(xprt);
+		return;
+	}
+	dprintk("RPC:       reading TCP record fragment of length %d\n",
+			transport->tcp_reclen);
+}
+
+static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
+{
+	if (transport->tcp_offset == transport->tcp_reclen) {
+		transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
+		transport->tcp_offset = 0;
+		if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
+			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+			transport->tcp_flags |= TCP_RCV_COPY_XID;
+			transport->tcp_copied = 0;
+		}
+	}
+}
+
+static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+	size_t len, used;
+	char *p;
+
+	len = sizeof(transport->tcp_xid) - transport->tcp_offset;
+	dprintk("RPC:       reading XID (%Zu bytes)\n", len);
+	p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
+	used = xdr_skb_read_bits(desc, p, len);
+	transport->tcp_offset += used;
+	if (used != len)
+		return;
+	transport->tcp_flags &= ~TCP_RCV_COPY_XID;
+	transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
+	transport->tcp_copied = 4;
+	dprintk("RPC:       reading %s XID %08x\n",
+			(transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
+							      : "request with",
+			ntohl(transport->tcp_xid));
+	xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
+				       struct xdr_skb_reader *desc)
+{
+	size_t len, used;
+	u32 offset;
+	char *p;
+
+	/*
+	 * We want transport->tcp_offset to be 8 at the end of this routine
+	 * (4 bytes for the xid and 4 bytes for the call/reply flag).
+	 * When this function is called for the first time,
+	 * transport->tcp_offset is 4 (after having already read the xid).
+	 */
+	offset = transport->tcp_offset - sizeof(transport->tcp_xid);
+	len = sizeof(transport->tcp_calldir) - offset;
+	dprintk("RPC:       reading CALL/REPLY flag (%Zu bytes)\n", len);
+	p = ((char *) &transport->tcp_calldir) + offset;
+	used = xdr_skb_read_bits(desc, p, len);
+	transport->tcp_offset += used;
+	if (used != len)
+		return;
+	transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
+	/*
+	 * We don't yet have the XDR buffer, so we will write the calldir
+	 * out after we get the buffer from the 'struct rpc_rqst'
+	 */
+	switch (ntohl(transport->tcp_calldir)) {
+	case RPC_REPLY:
+		transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
+		transport->tcp_flags |= TCP_RCV_COPY_DATA;
+		transport->tcp_flags |= TCP_RPC_REPLY;
+		break;
+	case RPC_CALL:
+		transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
+		transport->tcp_flags |= TCP_RCV_COPY_DATA;
+		transport->tcp_flags &= ~TCP_RPC_REPLY;
+		break;
+	default:
+		dprintk("RPC:       invalid request message type\n");
+		xs_tcp_force_close(&transport->xprt);
+	}
+	xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
+				     struct xdr_skb_reader *desc,
+				     struct rpc_rqst *req)
+{
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *rcvbuf;
+	size_t len;
+	ssize_t r;
+
+	rcvbuf = &req->rq_private_buf;
+
+	if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
+		/*
+		 * Save the RPC direction in the XDR buffer
+		 */
+		memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
+			&transport->tcp_calldir,
+			sizeof(transport->tcp_calldir));
+		transport->tcp_copied += sizeof(transport->tcp_calldir);
+		transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
+	}
+
+	len = desc->count;
+	if (len > transport->tcp_reclen - transport->tcp_offset) {
+		struct xdr_skb_reader my_desc;
+
+		len = transport->tcp_reclen - transport->tcp_offset;
+		memcpy(&my_desc, desc, sizeof(my_desc));
+		my_desc.count = len;
+		r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+					  &my_desc, xdr_skb_read_bits);
+		desc->count -= r;
+		desc->offset += r;
+	} else
+		r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+					  desc, xdr_skb_read_bits);
+
+	if (r > 0) {
+		transport->tcp_copied += r;
+		transport->tcp_offset += r;
+	}
+	if (r != len) {
+		/* Error when copying to the receive buffer,
+		 * usually because we weren't able to allocate
+		 * additional buffer pages. All we can do now
+		 * is turn off TCP_RCV_COPY_DATA, so the request
+		 * will not receive any additional updates,
+		 * and time out.
+		 * Any remaining data from this record will
+		 * be discarded.
+		 */
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+		dprintk("RPC:       XID %08x truncated request\n",
+				ntohl(transport->tcp_xid));
+		dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
+				"tcp_offset = %u, tcp_reclen = %u\n",
+				xprt, transport->tcp_copied,
+				transport->tcp_offset, transport->tcp_reclen);
+		return;
+	}
+
+	dprintk("RPC:       XID %08x read %Zd bytes\n",
+			ntohl(transport->tcp_xid), r);
+	dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
+			"tcp_reclen = %u\n", xprt, transport->tcp_copied,
+			transport->tcp_offset, transport->tcp_reclen);
+
+	if (transport->tcp_copied == req->rq_private_buf.buflen)
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+	else if (transport->tcp_offset == transport->tcp_reclen) {
+		if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
+			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+	}
+}
+
+/*
+ * Finds the request corresponding to the RPC xid and invokes the common
+ * tcp read code to read the data.
+ */
+static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
+				    struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+	struct rpc_rqst *req;
+
+	dprintk("RPC:       read reply XID %08x\n", ntohl(transport->tcp_xid));
+
+	/* Find and lock the request corresponding to this xid */
+	spin_lock(&xprt->transport_lock);
+	req = xprt_lookup_rqst(xprt, transport->tcp_xid);
+	if (!req) {
+		dprintk("RPC:       XID %08x request not found!\n",
+				ntohl(transport->tcp_xid));
+		spin_unlock(&xprt->transport_lock);
+		return -1;
+	}
+
+	xs_tcp_read_common(xprt, desc, req);
+
+	if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+		xprt_complete_rqst(req->rq_task, transport->tcp_copied);
+
+	spin_unlock(&xprt->transport_lock);
+	return 0;
+}
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Obtains an rpc_rqst previously allocated and invokes the common
+ * tcp read code to read the data.  The result is placed in the callback
+ * queue.
+ * If we're unable to obtain the rpc_rqst we schedule the closing of the
+ * connection and return -1.
+ */
+static int xs_tcp_read_callback(struct rpc_xprt *xprt,
+				       struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+	struct rpc_rqst *req;
+
+	/* Look up and lock the request corresponding to the given XID */
+	spin_lock(&xprt->transport_lock);
+	req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
+	if (req == NULL) {
+		spin_unlock(&xprt->transport_lock);
+		printk(KERN_WARNING "Callback slot table overflowed\n");
+		xprt_force_disconnect(xprt);
+		return -1;
+	}
+
+	dprintk("RPC:       read callback  XID %08x\n", ntohl(req->rq_xid));
+	xs_tcp_read_common(xprt, desc, req);
+
+	if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+		xprt_complete_bc_request(req, transport->tcp_copied);
+	spin_unlock(&xprt->transport_lock);
+
+	return 0;
+}
+
+static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
+					struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+
+	return (transport->tcp_flags & TCP_RPC_REPLY) ?
+		xs_tcp_read_reply(xprt, desc) :
+		xs_tcp_read_callback(xprt, desc);
+}
+#else
+static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
+					struct xdr_skb_reader *desc)
+{
+	return xs_tcp_read_reply(xprt, desc);
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+/*
+ * Read data off the transport.  This can be either an RPC_CALL or an
+ * RPC_REPLY.  Relay the processing to helper functions.
+ */
+static void xs_tcp_read_data(struct rpc_xprt *xprt,
+				    struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+
+	if (_xs_tcp_read_data(xprt, desc) == 0)
+		xs_tcp_check_fraghdr(transport);
+	else {
+		/*
+		 * The transport_lock protects the request handling.
+		 * There's no need to hold it to update the tcp_flags.
+		 */
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+	}
+}
+
+static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+	size_t len;
+
+	len = transport->tcp_reclen - transport->tcp_offset;
+	if (len > desc->count)
+		len = desc->count;
+	desc->count -= len;
+	desc->offset += len;
+	transport->tcp_offset += len;
+	dprintk("RPC:       discarded %Zu bytes\n", len);
+	xs_tcp_check_fraghdr(transport);
+}
+
+static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
+{
+	struct rpc_xprt *xprt = rd_desc->arg.data;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_skb_reader desc = {
+		.skb	= skb,
+		.offset	= offset,
+		.count	= len,
+	};
+
+	dprintk("RPC:       xs_tcp_data_recv started\n");
+	do {
+		trace_xs_tcp_data_recv(transport);
+		/* Read in a new fragment marker if necessary */
+		/* Can we ever really expect to get completely empty fragments? */
+		if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
+			xs_tcp_read_fraghdr(xprt, &desc);
+			continue;
+		}
+		/* Read in the xid if necessary */
+		if (transport->tcp_flags & TCP_RCV_COPY_XID) {
+			xs_tcp_read_xid(transport, &desc);
+			continue;
+		}
+		/* Read in the call/reply flag */
+		if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
+			xs_tcp_read_calldir(transport, &desc);
+			continue;
+		}
+		/* Read in the request data */
+		if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
+			xs_tcp_read_data(xprt, &desc);
+			continue;
+		}
+		/* Skip over any trailing bytes on short reads */
+		xs_tcp_read_discard(transport, &desc);
+	} while (desc.count);
+	trace_xs_tcp_data_recv(transport);
+	dprintk("RPC:       xs_tcp_data_recv done\n");
+	return len - desc.count;
+}
+
+/**
+ * xs_tcp_data_ready - "data ready" callback for TCP sockets
+ * @sk: socket with data to read
+ * @bytes: how much data to read
+ *
+ */
+static void xs_tcp_data_ready(struct sock *sk)
+{
+	struct rpc_xprt *xprt;
+	read_descriptor_t rd_desc;
+	int read;
+	unsigned long total = 0;
+
+	dprintk("RPC:       xs_tcp_data_ready...\n");
+
+	read_lock_bh(&sk->sk_callback_lock);
+	if (!(xprt = xprt_from_sock(sk))) {
+		read = 0;
+		goto out;
+	}
+	/* Any data means we had a useful conversation, so
+	 * the we don't need to delay the next reconnect
+	 */
+	if (xprt->reestablish_timeout)
+		xprt->reestablish_timeout = 0;
+
+	/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
+	rd_desc.arg.data = xprt;
+	do {
+		rd_desc.count = 65536;
+		read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
+		if (read > 0)
+			total += read;
+	} while (read > 0);
+out:
+	trace_xs_tcp_data_ready(xprt, read, total);
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_state_change - callback to handle TCP socket state changes
+ * @sk: socket whose state has changed
+ *
+ */
+static void xs_tcp_state_change(struct sock *sk)
+{
+	struct rpc_xprt *xprt;
+
+	read_lock_bh(&sk->sk_callback_lock);
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+	dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
+	dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
+			sk->sk_state, xprt_connected(xprt),
+			sock_flag(sk, SOCK_DEAD),
+			sock_flag(sk, SOCK_ZAPPED),
+			sk->sk_shutdown);
+
+	trace_rpc_socket_state_change(xprt, sk->sk_socket);
+	switch (sk->sk_state) {
+	case TCP_ESTABLISHED:
+		spin_lock(&xprt->transport_lock);
+		if (!xprt_test_and_set_connected(xprt)) {
+			struct sock_xprt *transport = container_of(xprt,
+					struct sock_xprt, xprt);
+
+			/* Reset TCP record info */
+			transport->tcp_offset = 0;
+			transport->tcp_reclen = 0;
+			transport->tcp_copied = 0;
+			transport->tcp_flags =
+				TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
+			xprt->connect_cookie++;
+
+			xprt_wake_pending_tasks(xprt, -EAGAIN);
+		}
+		spin_unlock(&xprt->transport_lock);
+		break;
+	case TCP_FIN_WAIT1:
+		/* The client initiated a shutdown of the socket */
+		xprt->connect_cookie++;
+		xprt->reestablish_timeout = 0;
+		set_bit(XPRT_CLOSING, &xprt->state);
+		smp_mb__before_atomic();
+		clear_bit(XPRT_CONNECTED, &xprt->state);
+		clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+		smp_mb__after_atomic();
+		break;
+	case TCP_CLOSE_WAIT:
+		/* The server initiated a shutdown of the socket */
+		xprt->connect_cookie++;
+		clear_bit(XPRT_CONNECTED, &xprt->state);
+		xs_tcp_force_close(xprt);
+	case TCP_CLOSING:
+		/*
+		 * If the server closed down the connection, make sure that
+		 * we back off before reconnecting
+		 */
+		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+		break;
+	case TCP_LAST_ACK:
+		set_bit(XPRT_CLOSING, &xprt->state);
+		smp_mb__before_atomic();
+		clear_bit(XPRT_CONNECTED, &xprt->state);
+		smp_mb__after_atomic();
+		break;
+	case TCP_CLOSE:
+		xs_sock_mark_closed(xprt);
+	}
+ out:
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_write_space(struct sock *sk)
+{
+	struct socket *sock;
+	struct rpc_xprt *xprt;
+
+	if (unlikely(!(sock = sk->sk_socket)))
+		return;
+	clear_bit(SOCK_NOSPACE, &sock->flags);
+
+	if (unlikely(!(xprt = xprt_from_sock(sk))))
+		return;
+	if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
+		return;
+
+	xprt_write_space(xprt);
+}
+
+/**
+ * xs_udp_write_space - callback invoked when socket buffer space
+ *                             becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_udp_write_space(struct sock *sk)
+{
+	read_lock_bh(&sk->sk_callback_lock);
+
+	/* from net/core/sock.c:sock_def_write_space */
+	if (sock_writeable(sk))
+		xs_write_space(sk);
+
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_write_space - callback invoked when socket buffer space
+ *                             becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_tcp_write_space(struct sock *sk)
+{
+	read_lock_bh(&sk->sk_callback_lock);
+
+	/* from net/core/stream.c:sk_stream_write_space */
+	if (sk_stream_is_writeable(sk))
+		xs_write_space(sk);
+
+	read_unlock_bh(&sk->sk_callback_lock);
+}
+
+static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct sock *sk = transport->inet;
+
+	if (transport->rcvsize) {
+		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+		sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
+	}
+	if (transport->sndsize) {
+		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+		sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
+		sk->sk_write_space(sk);
+	}
+}
+
+/**
+ * xs_udp_set_buffer_size - set send and receive limits
+ * @xprt: generic transport
+ * @sndsize: requested size of send buffer, in bytes
+ * @rcvsize: requested size of receive buffer, in bytes
+ *
+ * Set socket send and receive buffer size limits.
+ */
+static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	transport->sndsize = 0;
+	if (sndsize)
+		transport->sndsize = sndsize + 1024;
+	transport->rcvsize = 0;
+	if (rcvsize)
+		transport->rcvsize = rcvsize + 1024;
+
+	xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
+ * @task: task that timed out
+ *
+ * Adjust the congestion window after a retransmit timeout has occurred.
+ */
+static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
+}
+
+static unsigned short xs_get_random_port(void)
+{
+	unsigned short range = xprt_max_resvport - xprt_min_resvport;
+	unsigned short rand = (unsigned short) prandom_u32() % range;
+	return rand + xprt_min_resvport;
+}
+
+/**
+ * xs_set_reuseaddr_port - set the socket's port and address reuse options
+ * @sock: socket
+ *
+ * Note that this function has to be called on all sockets that share the
+ * same port, and it must be called before binding.
+ */
+static void xs_sock_set_reuseport(struct socket *sock)
+{
+	int opt = 1;
+
+	kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
+			(char *)&opt, sizeof(opt));
+}
+
+static unsigned short xs_sock_getport(struct socket *sock)
+{
+	struct sockaddr_storage buf;
+	int buflen;
+	unsigned short port = 0;
+
+	if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
+		goto out;
+	switch (buf.ss_family) {
+	case AF_INET6:
+		port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
+		break;
+	case AF_INET:
+		port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
+	}
+out:
+	return port;
+}
+
+/**
+ * xs_set_port - reset the port number in the remote endpoint address
+ * @xprt: generic transport
+ * @port: new port number
+ *
+ */
+static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+	dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
+
+	rpc_set_port(xs_addr(xprt), port);
+	xs_update_peer_port(xprt);
+}
+
+static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
+{
+	if (transport->srcport == 0)
+		transport->srcport = xs_sock_getport(sock);
+}
+
+static unsigned short xs_get_srcport(struct sock_xprt *transport)
+{
+	unsigned short port = transport->srcport;
+
+	if (port == 0 && transport->xprt.resvport)
+		port = xs_get_random_port();
+	return port;
+}
+
+static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
+{
+	if (transport->srcport != 0)
+		transport->srcport = 0;
+	if (!transport->xprt.resvport)
+		return 0;
+	if (port <= xprt_min_resvport || port > xprt_max_resvport)
+		return xprt_max_resvport;
+	return --port;
+}
+static int xs_bind(struct sock_xprt *transport, struct socket *sock)
+{
+	struct sockaddr_storage myaddr;
+	int err, nloop = 0;
+	unsigned short port = xs_get_srcport(transport);
+	unsigned short last;
+
+	/*
+	 * If we are asking for any ephemeral port (i.e. port == 0 &&
+	 * transport->xprt.resvport == 0), don't bind.  Let the local
+	 * port selection happen implicitly when the socket is used
+	 * (for example at connect time).
+	 *
+	 * This ensures that we can continue to establish TCP
+	 * connections even when all local ephemeral ports are already
+	 * a part of some TCP connection.  This makes no difference
+	 * for UDP sockets, but also doens't harm them.
+	 *
+	 * If we're asking for any reserved port (i.e. port == 0 &&
+	 * transport->xprt.resvport == 1) xs_get_srcport above will
+	 * ensure that port is non-zero and we will bind as needed.
+	 */
+	if (port == 0)
+		return 0;
+
+	memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
+	do {
+		rpc_set_port((struct sockaddr *)&myaddr, port);
+		err = kernel_bind(sock, (struct sockaddr *)&myaddr,
+				transport->xprt.addrlen);
+		if (err == 0) {
+			transport->srcport = port;
+			break;
+		}
+		last = port;
+		port = xs_next_srcport(transport, port);
+		if (port > last)
+			nloop++;
+	} while (err == -EADDRINUSE && nloop != 2);
+
+	if (myaddr.ss_family == AF_INET)
+		dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
+				&((struct sockaddr_in *)&myaddr)->sin_addr,
+				port, err ? "failed" : "ok", err);
+	else
+		dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
+				&((struct sockaddr_in6 *)&myaddr)->sin6_addr,
+				port, err ? "failed" : "ok", err);
+	return err;
+}
+
+/*
+ * We don't support autobind on AF_LOCAL sockets
+ */
+static void xs_local_rpcbind(struct rpc_task *task)
+{
+	rcu_read_lock();
+	xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
+	rcu_read_unlock();
+}
+
+static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key xs_key[2];
+static struct lock_class_key xs_slock_key[2];
+
+static inline void xs_reclassify_socketu(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
+		&xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
+}
+
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
+		&xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
+		&xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
+}
+
+static inline void xs_reclassify_socket(int family, struct socket *sock)
+{
+	WARN_ON_ONCE(sock_owned_by_user(sock->sk));
+	if (sock_owned_by_user(sock->sk))
+		return;
+
+	switch (family) {
+	case AF_LOCAL:
+		xs_reclassify_socketu(sock);
+		break;
+	case AF_INET:
+		xs_reclassify_socket4(sock);
+		break;
+	case AF_INET6:
+		xs_reclassify_socket6(sock);
+		break;
+	}
+}
+#else
+static inline void xs_reclassify_socketu(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket(int family, struct socket *sock)
+{
+}
+#endif
+
+static void xs_dummy_setup_socket(struct work_struct *work)
+{
+}
+
+static struct socket *xs_create_sock(struct rpc_xprt *xprt,
+		struct sock_xprt *transport, int family, int type,
+		int protocol, bool reuseport)
+{
+	struct socket *sock;
+	int err;
+
+	err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
+	if (err < 0) {
+		dprintk("RPC:       can't create %d transport socket (%d).\n",
+				protocol, -err);
+		goto out;
+	}
+	xs_reclassify_socket(family, sock);
+
+	if (reuseport)
+		xs_sock_set_reuseport(sock);
+
+	err = xs_bind(transport, sock);
+	if (err) {
+		sock_release(sock);
+		goto out;
+	}
+
+	return sock;
+out:
+	return ERR_PTR(err);
+}
+
+static int xs_local_finish_connecting(struct rpc_xprt *xprt,
+				      struct socket *sock)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
+									xprt);
+
+	if (!transport->inet) {
+		struct sock *sk = sock->sk;
+
+		write_lock_bh(&sk->sk_callback_lock);
+
+		xs_save_old_callbacks(transport, sk);
+
+		sk->sk_user_data = xprt;
+		sk->sk_data_ready = xs_local_data_ready;
+		sk->sk_write_space = xs_udp_write_space;
+		sk->sk_error_report = xs_error_report;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		xprt_clear_connected(xprt);
+
+		/* Reset to new socket */
+		transport->sock = sock;
+		transport->inet = sk;
+
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+
+	/* Tell the socket layer to start connecting... */
+	xprt->stat.connect_count++;
+	xprt->stat.connect_start = jiffies;
+	return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
+}
+
+/**
+ * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
+ * @xprt: RPC transport to connect
+ * @transport: socket transport to connect
+ * @create_sock: function to create a socket of the correct type
+ */
+static int xs_local_setup_socket(struct sock_xprt *transport)
+{
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock;
+	int status = -EIO;
+
+	status = __sock_create(xprt->xprt_net, AF_LOCAL,
+					SOCK_STREAM, 0, &sock, 1);
+	if (status < 0) {
+		dprintk("RPC:       can't create AF_LOCAL "
+			"transport socket (%d).\n", -status);
+		goto out;
+	}
+	xs_reclassify_socketu(sock);
+
+	dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+	status = xs_local_finish_connecting(xprt, sock);
+	trace_rpc_socket_connect(xprt, sock, status);
+	switch (status) {
+	case 0:
+		dprintk("RPC:       xprt %p connected to %s\n",
+				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+		xprt_set_connected(xprt);
+	case -ENOBUFS:
+		break;
+	case -ENOENT:
+		dprintk("RPC:       xprt %p: socket %s does not exist\n",
+				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+		break;
+	case -ECONNREFUSED:
+		dprintk("RPC:       xprt %p: connection refused for %s\n",
+				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
+		break;
+	default:
+		printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
+				__func__, -status,
+				xprt->address_strings[RPC_DISPLAY_ADDR]);
+	}
+
+out:
+	xprt_clear_connecting(xprt);
+	xprt_wake_pending_tasks(xprt, status);
+	return status;
+}
+
+static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	int ret;
+
+	 if (RPC_IS_ASYNC(task)) {
+		/*
+		 * We want the AF_LOCAL connect to be resolved in the
+		 * filesystem namespace of the process making the rpc
+		 * call.  Thus we connect synchronously.
+		 *
+		 * If we want to support asynchronous AF_LOCAL calls,
+		 * we'll need to figure out how to pass a namespace to
+		 * connect.
+		 */
+		rpc_exit(task, -ENOTCONN);
+		return;
+	}
+	ret = xs_local_setup_socket(transport);
+	if (ret && !RPC_IS_SOFTCONN(task))
+		msleep_interruptible(15000);
+}
+
+#ifdef CONFIG_SUNRPC_SWAP
+static void xs_set_memalloc(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
+			xprt);
+
+	if (xprt->swapper)
+		sk_set_memalloc(transport->inet);
+}
+
+/**
+ * xs_swapper - Tag this transport as being used for swap.
+ * @xprt: transport to tag
+ * @enable: enable/disable
+ *
+ */
+int xs_swapper(struct rpc_xprt *xprt, int enable)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
+			xprt);
+	int err = 0;
+
+	if (enable) {
+		xprt->swapper++;
+		xs_set_memalloc(xprt);
+	} else if (xprt->swapper) {
+		xprt->swapper--;
+		sk_clear_memalloc(transport->inet);
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(xs_swapper);
+#else
+static void xs_set_memalloc(struct rpc_xprt *xprt)
+{
+}
+#endif
+
+static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	if (!transport->inet) {
+		struct sock *sk = sock->sk;
+
+		write_lock_bh(&sk->sk_callback_lock);
+
+		xs_save_old_callbacks(transport, sk);
+
+		sk->sk_user_data = xprt;
+		sk->sk_data_ready = xs_udp_data_ready;
+		sk->sk_write_space = xs_udp_write_space;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		xprt_set_connected(xprt);
+
+		/* Reset to new socket */
+		transport->sock = sock;
+		transport->inet = sk;
+
+		xs_set_memalloc(xprt);
+
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+	xs_udp_do_set_buffer_size(xprt);
+}
+
+static void xs_udp_setup_socket(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int status = -EIO;
+
+	sock = xs_create_sock(xprt, transport,
+			xs_addr(xprt)->sa_family, SOCK_DGRAM,
+			IPPROTO_UDP, false);
+	if (IS_ERR(sock))
+		goto out;
+
+	dprintk("RPC:       worker connecting xprt %p via %s to "
+				"%s (port %s)\n", xprt,
+			xprt->address_strings[RPC_DISPLAY_PROTO],
+			xprt->address_strings[RPC_DISPLAY_ADDR],
+			xprt->address_strings[RPC_DISPLAY_PORT]);
+
+	xs_udp_finish_connecting(xprt, sock);
+	trace_rpc_socket_connect(xprt, sock, 0);
+	status = 0;
+out:
+	xprt_unlock_connect(xprt, transport);
+	xprt_clear_connecting(xprt);
+	xprt_wake_pending_tasks(xprt, status);
+}
+
+static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	int ret = -ENOTCONN;
+
+	if (!transport->inet) {
+		struct sock *sk = sock->sk;
+		unsigned int keepidle = xprt->timeout->to_initval / HZ;
+		unsigned int keepcnt = xprt->timeout->to_retries + 1;
+		unsigned int opt_on = 1;
+
+		/* TCP Keepalive options */
+		kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
+				(char *)&opt_on, sizeof(opt_on));
+		kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
+				(char *)&keepidle, sizeof(keepidle));
+		kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
+				(char *)&keepidle, sizeof(keepidle));
+		kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
+				(char *)&keepcnt, sizeof(keepcnt));
+
+		write_lock_bh(&sk->sk_callback_lock);
+
+		xs_save_old_callbacks(transport, sk);
+
+		sk->sk_user_data = xprt;
+		sk->sk_data_ready = xs_tcp_data_ready;
+		sk->sk_state_change = xs_tcp_state_change;
+		sk->sk_write_space = xs_tcp_write_space;
+		sk->sk_error_report = xs_error_report;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		/* socket options */
+		sock_reset_flag(sk, SOCK_LINGER);
+		tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+		xprt_clear_connected(xprt);
+
+		/* Reset to new socket */
+		transport->sock = sock;
+		transport->inet = sk;
+
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+
+	if (!xprt_bound(xprt))
+		goto out;
+
+	xs_set_memalloc(xprt);
+
+	/* Tell the socket layer to start connecting... */
+	xprt->stat.connect_count++;
+	xprt->stat.connect_start = jiffies;
+	ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+	switch (ret) {
+	case 0:
+		xs_set_srcport(transport, sock);
+	case -EINPROGRESS:
+		/* SYN_SENT! */
+		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+	}
+out:
+	return ret;
+}
+
+/**
+ * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
+ * @xprt: RPC transport to connect
+ * @transport: socket transport to connect
+ * @create_sock: function to create a socket of the correct type
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_setup_socket(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct socket *sock = transport->sock;
+	struct rpc_xprt *xprt = &transport->xprt;
+	int status = -EIO;
+
+	if (!sock) {
+		sock = xs_create_sock(xprt, transport,
+				xs_addr(xprt)->sa_family, SOCK_STREAM,
+				IPPROTO_TCP, true);
+		if (IS_ERR(sock)) {
+			status = PTR_ERR(sock);
+			goto out;
+		}
+	}
+
+	dprintk("RPC:       worker connecting xprt %p via %s to "
+				"%s (port %s)\n", xprt,
+			xprt->address_strings[RPC_DISPLAY_PROTO],
+			xprt->address_strings[RPC_DISPLAY_ADDR],
+			xprt->address_strings[RPC_DISPLAY_PORT]);
+
+	status = xs_tcp_finish_connecting(xprt, sock);
+	trace_rpc_socket_connect(xprt, sock, status);
+	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
+			xprt, -status, xprt_connected(xprt),
+			sock->sk->sk_state);
+	switch (status) {
+	default:
+		printk("%s: connect returned unhandled error %d\n",
+			__func__, status);
+	case -EADDRNOTAVAIL:
+		/* We're probably in TIME_WAIT. Get rid of existing socket,
+		 * and retry
+		 */
+		xs_tcp_force_close(xprt);
+		break;
+	case 0:
+	case -EINPROGRESS:
+	case -EALREADY:
+		xprt_unlock_connect(xprt, transport);
+		xprt_clear_connecting(xprt);
+		return;
+	case -EINVAL:
+		/* Happens, for instance, if the user specified a link
+		 * local IPv6 address without a scope-id.
+		 */
+	case -ECONNREFUSED:
+	case -ECONNRESET:
+	case -ENETUNREACH:
+	case -EADDRINUSE:
+	case -ENOBUFS:
+		/* retry with existing socket, after a delay */
+		xs_tcp_force_close(xprt);
+		goto out;
+	}
+	status = -EAGAIN;
+out:
+	xprt_unlock_connect(xprt, transport);
+	xprt_clear_connecting(xprt);
+	xprt_wake_pending_tasks(xprt, status);
+}
+
+/**
+ * xs_connect - connect a socket to a remote endpoint
+ * @xprt: pointer to transport structure
+ * @task: address of RPC task that manages state of connect request
+ *
+ * TCP: If the remote end dropped the connection, delay reconnecting.
+ *
+ * UDP socket connects are synchronous, but we use a work queue anyway
+ * to guarantee that even unprivileged user processes can set up a
+ * socket on a privileged port.
+ *
+ * If a UDP socket connect fails, the delay behavior here prevents
+ * retry floods (hard mounts).
+ */
+static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
+
+	/* Start by resetting any existing state */
+	xs_reset_transport(transport);
+
+	if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
+		dprintk("RPC:       xs_connect delayed xprt %p for %lu "
+				"seconds\n",
+				xprt, xprt->reestablish_timeout / HZ);
+		queue_delayed_work(rpciod_workqueue,
+				   &transport->connect_worker,
+				   xprt->reestablish_timeout);
+		xprt->reestablish_timeout <<= 1;
+		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+		if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
+	} else {
+		dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
+		queue_delayed_work(rpciod_workqueue,
+				   &transport->connect_worker, 0);
+	}
+}
+
+/**
+ * xs_local_print_stats - display AF_LOCAL socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	long idle_time = 0;
+
+	if (xprt_connected(xprt))
+		idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+	seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
+			"%llu %llu %lu %llu %llu\n",
+			xprt->stat.bind_count,
+			xprt->stat.connect_count,
+			xprt->stat.connect_time,
+			idle_time,
+			xprt->stat.sends,
+			xprt->stat.recvs,
+			xprt->stat.bad_xids,
+			xprt->stat.req_u,
+			xprt->stat.bklog_u,
+			xprt->stat.max_slots,
+			xprt->stat.sending_u,
+			xprt->stat.pending_u);
+}
+
+/**
+ * xs_udp_print_stats - display UDP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
+			"%lu %llu %llu\n",
+			transport->srcport,
+			xprt->stat.bind_count,
+			xprt->stat.sends,
+			xprt->stat.recvs,
+			xprt->stat.bad_xids,
+			xprt->stat.req_u,
+			xprt->stat.bklog_u,
+			xprt->stat.max_slots,
+			xprt->stat.sending_u,
+			xprt->stat.pending_u);
+}
+
+/**
+ * xs_tcp_print_stats - display TCP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	long idle_time = 0;
+
+	if (xprt_connected(xprt))
+		idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+	seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
+			"%llu %llu %lu %llu %llu\n",
+			transport->srcport,
+			xprt->stat.bind_count,
+			xprt->stat.connect_count,
+			xprt->stat.connect_time,
+			idle_time,
+			xprt->stat.sends,
+			xprt->stat.recvs,
+			xprt->stat.bad_xids,
+			xprt->stat.req_u,
+			xprt->stat.bklog_u,
+			xprt->stat.max_slots,
+			xprt->stat.sending_u,
+			xprt->stat.pending_u);
+}
+
+/*
+ * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
+ * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
+ * to use the server side send routines.
+ */
+static void *bc_malloc(struct rpc_task *task, size_t size)
+{
+	struct page *page;
+	struct rpc_buffer *buf;
+
+	WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
+	if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
+		return NULL;
+
+	page = alloc_page(GFP_KERNEL);
+	if (!page)
+		return NULL;
+
+	buf = page_address(page);
+	buf->len = PAGE_SIZE;
+
+	return buf->data;
+}
+
+/*
+ * Free the space allocated in the bc_alloc routine
+ */
+static void bc_free(void *buffer)
+{
+	struct rpc_buffer *buf;
+
+	if (!buffer)
+		return;
+
+	buf = container_of(buffer, struct rpc_buffer, data);
+	free_page((unsigned long)buf);
+}
+
+/*
+ * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
+ * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
+ */
+static int bc_sendto(struct rpc_rqst *req)
+{
+	int len;
+	struct xdr_buf *xbufp = &req->rq_snd_buf;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport =
+				container_of(xprt, struct sock_xprt, xprt);
+	struct socket *sock = transport->sock;
+	unsigned long headoff;
+	unsigned long tailoff;
+
+	xs_encode_stream_record_marker(xbufp);
+
+	tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
+	headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
+	len = svc_send_common(sock, xbufp,
+			      virt_to_page(xbufp->head[0].iov_base), headoff,
+			      xbufp->tail[0].iov_base, tailoff);
+
+	if (len != xbufp->len) {
+		printk(KERN_NOTICE "Error sending entire callback!\n");
+		len = -EAGAIN;
+	}
+
+	return len;
+}
+
+/*
+ * The send routine. Borrows from svc_send
+ */
+static int bc_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct svc_xprt	*xprt;
+	u32                     len;
+
+	dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
+	/*
+	 * Get the server socket associated with this callback xprt
+	 */
+	xprt = req->rq_xprt->bc_xprt;
+
+	/*
+	 * Grab the mutex to serialize data as the connection is shared
+	 * with the fore channel
+	 */
+	if (!mutex_trylock(&xprt->xpt_mutex)) {
+		rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
+		if (!mutex_trylock(&xprt->xpt_mutex))
+			return -EAGAIN;
+		rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
+	}
+	if (test_bit(XPT_DEAD, &xprt->xpt_flags))
+		len = -ENOTCONN;
+	else
+		len = bc_sendto(req);
+	mutex_unlock(&xprt->xpt_mutex);
+
+	if (len > 0)
+		len = 0;
+
+	return len;
+}
+
+/*
+ * The close routine. Since this is client initiated, we do nothing
+ */
+
+static void bc_close(struct rpc_xprt *xprt)
+{
+}
+
+/*
+ * The xprt destroy routine. Again, because this connection is client
+ * initiated, we do nothing
+ */
+
+static void bc_destroy(struct rpc_xprt *xprt)
+{
+	dprintk("RPC:       bc_destroy xprt %p\n", xprt);
+
+	xs_xprt_free(xprt);
+	module_put(THIS_MODULE);
+}
+
+static struct rpc_xprt_ops xs_local_ops = {
+	.reserve_xprt		= xprt_reserve_xprt,
+	.release_xprt		= xs_tcp_release_xprt,
+	.alloc_slot		= xprt_alloc_slot,
+	.rpcbind		= xs_local_rpcbind,
+	.set_port		= xs_local_set_port,
+	.connect		= xs_local_connect,
+	.buf_alloc		= rpc_malloc,
+	.buf_free		= rpc_free,
+	.send_request		= xs_local_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.close			= xs_close,
+	.destroy		= xs_destroy,
+	.print_stats		= xs_local_print_stats,
+};
+
+static struct rpc_xprt_ops xs_udp_ops = {
+	.set_buffer_size	= xs_udp_set_buffer_size,
+	.reserve_xprt		= xprt_reserve_xprt_cong,
+	.release_xprt		= xprt_release_xprt_cong,
+	.alloc_slot		= xprt_alloc_slot,
+	.rpcbind		= rpcb_getport_async,
+	.set_port		= xs_set_port,
+	.connect		= xs_connect,
+	.buf_alloc		= rpc_malloc,
+	.buf_free		= rpc_free,
+	.send_request		= xs_udp_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_rtt,
+	.timer			= xs_udp_timer,
+	.release_request	= xprt_release_rqst_cong,
+	.close			= xs_close,
+	.destroy		= xs_destroy,
+	.print_stats		= xs_udp_print_stats,
+};
+
+static struct rpc_xprt_ops xs_tcp_ops = {
+	.reserve_xprt		= xprt_reserve_xprt,
+	.release_xprt		= xs_tcp_release_xprt,
+	.alloc_slot		= xprt_lock_and_alloc_slot,
+	.rpcbind		= rpcb_getport_async,
+	.set_port		= xs_set_port,
+	.connect		= xs_connect,
+	.buf_alloc		= rpc_malloc,
+	.buf_free		= rpc_free,
+	.send_request		= xs_tcp_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.close			= xs_tcp_shutdown,
+	.destroy		= xs_destroy,
+	.print_stats		= xs_tcp_print_stats,
+};
+
+/*
+ * The rpc_xprt_ops for the server backchannel
+ */
+
+static struct rpc_xprt_ops bc_tcp_ops = {
+	.reserve_xprt		= xprt_reserve_xprt,
+	.release_xprt		= xprt_release_xprt,
+	.alloc_slot		= xprt_alloc_slot,
+	.buf_alloc		= bc_malloc,
+	.buf_free		= bc_free,
+	.send_request		= bc_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.close			= bc_close,
+	.destroy		= bc_destroy,
+	.print_stats		= xs_tcp_print_stats,
+};
+
+static int xs_init_anyaddr(const int family, struct sockaddr *sap)
+{
+	static const struct sockaddr_in sin = {
+		.sin_family		= AF_INET,
+		.sin_addr.s_addr	= htonl(INADDR_ANY),
+	};
+	static const struct sockaddr_in6 sin6 = {
+		.sin6_family		= AF_INET6,
+		.sin6_addr		= IN6ADDR_ANY_INIT,
+	};
+
+	switch (family) {
+	case AF_LOCAL:
+		break;
+	case AF_INET:
+		memcpy(sap, &sin, sizeof(sin));
+		break;
+	case AF_INET6:
+		memcpy(sap, &sin6, sizeof(sin6));
+		break;
+	default:
+		dprintk("RPC:       %s: Bad address family\n", __func__);
+		return -EAFNOSUPPORT;
+	}
+	return 0;
+}
+
+static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
+				      unsigned int slot_table_size,
+				      unsigned int max_slot_table_size)
+{
+	struct rpc_xprt *xprt;
+	struct sock_xprt *new;
+
+	if (args->addrlen > sizeof(xprt->addr)) {
+		dprintk("RPC:       xs_setup_xprt: address too large\n");
+		return ERR_PTR(-EBADF);
+	}
+
+	xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
+			max_slot_table_size);
+	if (xprt == NULL) {
+		dprintk("RPC:       xs_setup_xprt: couldn't allocate "
+				"rpc_xprt\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	new = container_of(xprt, struct sock_xprt, xprt);
+	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
+	xprt->addrlen = args->addrlen;
+	if (args->srcaddr)
+		memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
+	else {
+		int err;
+		err = xs_init_anyaddr(args->dstaddr->sa_family,
+					(struct sockaddr *)&new->srcaddr);
+		if (err != 0) {
+			xprt_free(xprt);
+			return ERR_PTR(err);
+		}
+	}
+
+	return xprt;
+}
+
+static const struct rpc_timeout xs_local_default_timeout = {
+	.to_initval = 10 * HZ,
+	.to_maxval = 10 * HZ,
+	.to_retries = 2,
+};
+
+/**
+ * xs_setup_local - Set up transport to use an AF_LOCAL socket
+ * @args: rpc transport creation arguments
+ *
+ * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
+ */
+static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
+{
+	struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
+	struct sock_xprt *transport;
+	struct rpc_xprt *xprt;
+	struct rpc_xprt *ret;
+
+	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+			xprt_max_tcp_slot_table_entries);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = 0;
+	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+
+	xprt->bind_timeout = XS_BIND_TO;
+	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+	xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+	xprt->ops = &xs_local_ops;
+	xprt->timeout = &xs_local_default_timeout;
+
+	INIT_DELAYED_WORK(&transport->connect_worker,
+			xs_dummy_setup_socket);
+
+	switch (sun->sun_family) {
+	case AF_LOCAL:
+		if (sun->sun_path[0] != '/') {
+			dprintk("RPC:       bad AF_LOCAL address: %s\n",
+					sun->sun_path);
+			ret = ERR_PTR(-EINVAL);
+			goto out_err;
+		}
+		xprt_set_bound(xprt);
+		xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
+		ret = ERR_PTR(xs_local_setup_socket(transport));
+		if (ret)
+			goto out_err;
+		break;
+	default:
+		ret = ERR_PTR(-EAFNOSUPPORT);
+		goto out_err;
+	}
+
+	dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
+			xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+	ret = ERR_PTR(-EINVAL);
+out_err:
+	xs_xprt_free(xprt);
+	return ret;
+}
+
+static const struct rpc_timeout xs_udp_default_timeout = {
+	.to_initval = 5 * HZ,
+	.to_maxval = 30 * HZ,
+	.to_increment = 5 * HZ,
+	.to_retries = 5,
+};
+
+/**
+ * xs_setup_udp - Set up transport to use a UDP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
+{
+	struct sockaddr *addr = args->dstaddr;
+	struct rpc_xprt *xprt;
+	struct sock_xprt *transport;
+	struct rpc_xprt *ret;
+
+	xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
+			xprt_udp_slot_table_entries);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = IPPROTO_UDP;
+	xprt->tsh_size = 0;
+	/* XXX: header size can vary due to auth type, IPv6, etc. */
+	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
+
+	xprt->bind_timeout = XS_BIND_TO;
+	xprt->reestablish_timeout = XS_UDP_REEST_TO;
+	xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+	xprt->ops = &xs_udp_ops;
+
+	xprt->timeout = &xs_udp_default_timeout;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_setup_socket);
+		xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_setup_socket);
+		xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
+		break;
+	default:
+		ret = ERR_PTR(-EAFNOSUPPORT);
+		goto out_err;
+	}
+
+	if (xprt_bound(xprt))
+		dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
+				xprt->address_strings[RPC_DISPLAY_ADDR],
+				xprt->address_strings[RPC_DISPLAY_PORT],
+				xprt->address_strings[RPC_DISPLAY_PROTO]);
+	else
+		dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
+				xprt->address_strings[RPC_DISPLAY_ADDR],
+				xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+	ret = ERR_PTR(-EINVAL);
+out_err:
+	xs_xprt_free(xprt);
+	return ret;
+}
+
+static const struct rpc_timeout xs_tcp_default_timeout = {
+	.to_initval = 60 * HZ,
+	.to_maxval = 60 * HZ,
+	.to_retries = 2,
+};
+
+/**
+ * xs_setup_tcp - Set up transport to use a TCP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
+{
+	struct sockaddr *addr = args->dstaddr;
+	struct rpc_xprt *xprt;
+	struct sock_xprt *transport;
+	struct rpc_xprt *ret;
+	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
+
+	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
+		max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
+
+	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+			max_slot_table_size);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = IPPROTO_TCP;
+	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+
+	xprt->bind_timeout = XS_BIND_TO;
+	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+	xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+	xprt->ops = &xs_tcp_ops;
+	xprt->timeout = &xs_tcp_default_timeout;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_tcp_setup_socket);
+		xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_tcp_setup_socket);
+		xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
+		break;
+	default:
+		ret = ERR_PTR(-EAFNOSUPPORT);
+		goto out_err;
+	}
+
+	if (xprt_bound(xprt))
+		dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
+				xprt->address_strings[RPC_DISPLAY_ADDR],
+				xprt->address_strings[RPC_DISPLAY_PORT],
+				xprt->address_strings[RPC_DISPLAY_PROTO]);
+	else
+		dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
+				xprt->address_strings[RPC_DISPLAY_ADDR],
+				xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+	ret = ERR_PTR(-EINVAL);
+out_err:
+	xs_xprt_free(xprt);
+	return ret;
+}
+
+/**
+ * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
+{
+	struct sockaddr *addr = args->dstaddr;
+	struct rpc_xprt *xprt;
+	struct sock_xprt *transport;
+	struct svc_sock *bc_sock;
+	struct rpc_xprt *ret;
+
+	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
+			xprt_tcp_slot_table_entries);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = IPPROTO_TCP;
+	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+	xprt->timeout = &xs_tcp_default_timeout;
+
+	/* backchannel */
+	xprt_set_bound(xprt);
+	xprt->bind_timeout = 0;
+	xprt->reestablish_timeout = 0;
+	xprt->idle_timeout = 0;
+
+	xprt->ops = &bc_tcp_ops;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		xs_format_peer_addresses(xprt, "tcp",
+					 RPCBIND_NETID_TCP);
+		break;
+	case AF_INET6:
+		xs_format_peer_addresses(xprt, "tcp",
+				   RPCBIND_NETID_TCP6);
+		break;
+	default:
+		ret = ERR_PTR(-EAFNOSUPPORT);
+		goto out_err;
+	}
+
+	dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
+			xprt->address_strings[RPC_DISPLAY_ADDR],
+			xprt->address_strings[RPC_DISPLAY_PORT],
+			xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+	/*
+	 * Once we've associated a backchannel xprt with a connection,
+	 * we want to keep it around as long as the connection lasts,
+	 * in case we need to start using it for a backchannel again;
+	 * this reference won't be dropped until bc_xprt is destroyed.
+	 */
+	xprt_get(xprt);
+	args->bc_xprt->xpt_bc_xprt = xprt;
+	xprt->bc_xprt = args->bc_xprt;
+	bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
+	transport->sock = bc_sock->sk_sock;
+	transport->inet = bc_sock->sk_sk;
+
+	/*
+	 * Since we don't want connections for the backchannel, we set
+	 * the xprt status to connected
+	 */
+	xprt_set_connected(xprt);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+
+	args->bc_xprt->xpt_bc_xprt = NULL;
+	xprt_put(xprt);
+	ret = ERR_PTR(-EINVAL);
+out_err:
+	xs_xprt_free(xprt);
+	return ret;
+}
+
+static struct xprt_class	xs_local_transport = {
+	.list		= LIST_HEAD_INIT(xs_local_transport.list),
+	.name		= "named UNIX socket",
+	.owner		= THIS_MODULE,
+	.ident		= XPRT_TRANSPORT_LOCAL,
+	.setup		= xs_setup_local,
+};
+
+static struct xprt_class	xs_udp_transport = {
+	.list		= LIST_HEAD_INIT(xs_udp_transport.list),
+	.name		= "udp",
+	.owner		= THIS_MODULE,
+	.ident		= XPRT_TRANSPORT_UDP,
+	.setup		= xs_setup_udp,
+};
+
+static struct xprt_class	xs_tcp_transport = {
+	.list		= LIST_HEAD_INIT(xs_tcp_transport.list),
+	.name		= "tcp",
+	.owner		= THIS_MODULE,
+	.ident		= XPRT_TRANSPORT_TCP,
+	.setup		= xs_setup_tcp,
+};
+
+static struct xprt_class	xs_bc_tcp_transport = {
+	.list		= LIST_HEAD_INIT(xs_bc_tcp_transport.list),
+	.name		= "tcp NFSv4.1 backchannel",
+	.owner		= THIS_MODULE,
+	.ident		= XPRT_TRANSPORT_BC_TCP,
+	.setup		= xs_setup_bc_tcp,
+};
+
+/**
+ * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
+ *
+ */
+int init_socket_xprt(void)
+{
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	if (!sunrpc_table_header)
+		sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+
+	xprt_register_transport(&xs_local_transport);
+	xprt_register_transport(&xs_udp_transport);
+	xprt_register_transport(&xs_tcp_transport);
+	xprt_register_transport(&xs_bc_tcp_transport);
+
+	return 0;
+}
+
+/**
+ * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
+ *
+ */
+void cleanup_socket_xprt(void)
+{
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	if (sunrpc_table_header) {
+		unregister_sysctl_table(sunrpc_table_header);
+		sunrpc_table_header = NULL;
+	}
+#endif
+
+	xprt_unregister_transport(&xs_local_transport);
+	xprt_unregister_transport(&xs_udp_transport);
+	xprt_unregister_transport(&xs_tcp_transport);
+	xprt_unregister_transport(&xs_bc_tcp_transport);
+}
+
+static int param_set_uint_minmax(const char *val,
+		const struct kernel_param *kp,
+		unsigned int min, unsigned int max)
+{
+	unsigned int num;
+	int ret;
+
+	if (!val)
+		return -EINVAL;
+	ret = kstrtouint(val, 0, &num);
+	if (ret == -EINVAL || num < min || num > max)
+		return -EINVAL;
+	*((unsigned int *)kp->arg) = num;
+	return 0;
+}
+
+static int param_set_portnr(const char *val, const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp,
+			RPC_MIN_RESVPORT,
+			RPC_MAX_RESVPORT);
+}
+
+static struct kernel_param_ops param_ops_portnr = {
+	.set = param_set_portnr,
+	.get = param_get_uint,
+};
+
+#define param_check_portnr(name, p) \
+	__param_check(name, p, unsigned int);
+
+module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
+module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
+
+static int param_set_slot_table_size(const char *val,
+				     const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp,
+			RPC_MIN_SLOT_TABLE,
+			RPC_MAX_SLOT_TABLE);
+}
+
+static struct kernel_param_ops param_ops_slot_table_size = {
+	.set = param_set_slot_table_size,
+	.get = param_get_uint,
+};
+
+#define param_check_slot_table_size(name, p) \
+	__param_check(name, p, unsigned int);
+
+static int param_set_max_slot_table_size(const char *val,
+				     const struct kernel_param *kp)
+{
+	return param_set_uint_minmax(val, kp,
+			RPC_MIN_SLOT_TABLE,
+			RPC_MAX_SLOT_TABLE_LIMIT);
+}
+
+static struct kernel_param_ops param_ops_max_slot_table_size = {
+	.set = param_set_max_slot_table_size,
+	.get = param_get_uint,
+};
+
+#define param_check_max_slot_table_size(name, p) \
+	__param_check(name, p, unsigned int);
+
+module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
+		   slot_table_size, 0644);
+module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
+		   max_slot_table_size, 0644);
+module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
+		   slot_table_size, 0644);
+