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authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/nbd/server.c
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/nbd/server.c')
-rw-r--r--qemu/nbd/server.c1290
1 files changed, 0 insertions, 1290 deletions
diff --git a/qemu/nbd/server.c b/qemu/nbd/server.c
deleted file mode 100644
index 2184c64fe..000000000
--- a/qemu/nbd/server.c
+++ /dev/null
@@ -1,1290 +0,0 @@
-/*
- * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
- *
- * Network Block Device Server Side
- *
- * 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; under version 2 of the License.
- *
- * 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, see <http://www.gnu.org/licenses/>.
- */
-
-#include "qemu/osdep.h"
-#include "qapi/error.h"
-#include "nbd-internal.h"
-
-static int system_errno_to_nbd_errno(int err)
-{
- switch (err) {
- case 0:
- return NBD_SUCCESS;
- case EPERM:
- case EROFS:
- return NBD_EPERM;
- case EIO:
- return NBD_EIO;
- case ENOMEM:
- return NBD_ENOMEM;
-#ifdef EDQUOT
- case EDQUOT:
-#endif
- case EFBIG:
- case ENOSPC:
- return NBD_ENOSPC;
- case EINVAL:
- default:
- return NBD_EINVAL;
- }
-}
-
-/* Definitions for opaque data types */
-
-typedef struct NBDRequest NBDRequest;
-
-struct NBDRequest {
- QSIMPLEQ_ENTRY(NBDRequest) entry;
- NBDClient *client;
- uint8_t *data;
-};
-
-struct NBDExport {
- int refcount;
- void (*close)(NBDExport *exp);
-
- BlockBackend *blk;
- char *name;
- off_t dev_offset;
- off_t size;
- uint32_t nbdflags;
- QTAILQ_HEAD(, NBDClient) clients;
- QTAILQ_ENTRY(NBDExport) next;
-
- AioContext *ctx;
-
- Notifier eject_notifier;
-};
-
-static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
-
-struct NBDClient {
- int refcount;
- void (*close)(NBDClient *client);
-
- NBDExport *exp;
- QCryptoTLSCreds *tlscreds;
- char *tlsaclname;
- QIOChannelSocket *sioc; /* The underlying data channel */
- QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
-
- Coroutine *recv_coroutine;
-
- CoMutex send_lock;
- Coroutine *send_coroutine;
-
- bool can_read;
-
- QTAILQ_ENTRY(NBDClient) next;
- int nb_requests;
- bool closing;
-};
-
-/* That's all folks */
-
-static void nbd_set_handlers(NBDClient *client);
-static void nbd_unset_handlers(NBDClient *client);
-static void nbd_update_can_read(NBDClient *client);
-
-static gboolean nbd_negotiate_continue(QIOChannel *ioc,
- GIOCondition condition,
- void *opaque)
-{
- qemu_coroutine_enter(opaque, NULL);
- return TRUE;
-}
-
-static ssize_t nbd_negotiate_read(QIOChannel *ioc, void *buffer, size_t size)
-{
- ssize_t ret;
- guint watch;
-
- assert(qemu_in_coroutine());
- /* Negotiation are always in main loop. */
- watch = qio_channel_add_watch(ioc,
- G_IO_IN,
- nbd_negotiate_continue,
- qemu_coroutine_self(),
- NULL);
- ret = read_sync(ioc, buffer, size);
- g_source_remove(watch);
- return ret;
-
-}
-
-static ssize_t nbd_negotiate_write(QIOChannel *ioc, void *buffer, size_t size)
-{
- ssize_t ret;
- guint watch;
-
- assert(qemu_in_coroutine());
- /* Negotiation are always in main loop. */
- watch = qio_channel_add_watch(ioc,
- G_IO_OUT,
- nbd_negotiate_continue,
- qemu_coroutine_self(),
- NULL);
- ret = write_sync(ioc, buffer, size);
- g_source_remove(watch);
- return ret;
-}
-
-static ssize_t nbd_negotiate_drop_sync(QIOChannel *ioc, size_t size)
-{
- ssize_t ret, dropped = size;
- uint8_t *buffer = g_malloc(MIN(65536, size));
-
- while (size > 0) {
- ret = nbd_negotiate_read(ioc, buffer, MIN(65536, size));
- if (ret < 0) {
- g_free(buffer);
- return ret;
- }
-
- assert(ret <= size);
- size -= ret;
- }
-
- g_free(buffer);
- return dropped;
-}
-
-/* Basic flow for negotiation
-
- Server Client
- Negotiate
-
- or
-
- Server Client
- Negotiate #1
- Option
- Negotiate #2
-
- ----
-
- followed by
-
- Server Client
- Request
- Response
- Request
- Response
- ...
- ...
- Request (type == 2)
-
-*/
-
-static int nbd_negotiate_send_rep(QIOChannel *ioc, uint32_t type, uint32_t opt)
-{
- uint64_t magic;
- uint32_t len;
-
- TRACE("Reply opt=%x type=%x", type, opt);
-
- magic = cpu_to_be64(NBD_REP_MAGIC);
- if (nbd_negotiate_write(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
- LOG("write failed (rep magic)");
- return -EINVAL;
- }
- opt = cpu_to_be32(opt);
- if (nbd_negotiate_write(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
- LOG("write failed (rep opt)");
- return -EINVAL;
- }
- type = cpu_to_be32(type);
- if (nbd_negotiate_write(ioc, &type, sizeof(type)) != sizeof(type)) {
- LOG("write failed (rep type)");
- return -EINVAL;
- }
- len = cpu_to_be32(0);
- if (nbd_negotiate_write(ioc, &len, sizeof(len)) != sizeof(len)) {
- LOG("write failed (rep data length)");
- return -EINVAL;
- }
- return 0;
-}
-
-static int nbd_negotiate_send_rep_list(QIOChannel *ioc, NBDExport *exp)
-{
- uint64_t magic, name_len;
- uint32_t opt, type, len;
-
- TRACE("Advertizing export name '%s'", exp->name ? exp->name : "");
- name_len = strlen(exp->name);
- magic = cpu_to_be64(NBD_REP_MAGIC);
- if (nbd_negotiate_write(ioc, &magic, sizeof(magic)) != sizeof(magic)) {
- LOG("write failed (magic)");
- return -EINVAL;
- }
- opt = cpu_to_be32(NBD_OPT_LIST);
- if (nbd_negotiate_write(ioc, &opt, sizeof(opt)) != sizeof(opt)) {
- LOG("write failed (opt)");
- return -EINVAL;
- }
- type = cpu_to_be32(NBD_REP_SERVER);
- if (nbd_negotiate_write(ioc, &type, sizeof(type)) != sizeof(type)) {
- LOG("write failed (reply type)");
- return -EINVAL;
- }
- len = cpu_to_be32(name_len + sizeof(len));
- if (nbd_negotiate_write(ioc, &len, sizeof(len)) != sizeof(len)) {
- LOG("write failed (length)");
- return -EINVAL;
- }
- len = cpu_to_be32(name_len);
- if (nbd_negotiate_write(ioc, &len, sizeof(len)) != sizeof(len)) {
- LOG("write failed (length)");
- return -EINVAL;
- }
- if (nbd_negotiate_write(ioc, exp->name, name_len) != name_len) {
- LOG("write failed (buffer)");
- return -EINVAL;
- }
- return 0;
-}
-
-static int nbd_negotiate_handle_list(NBDClient *client, uint32_t length)
-{
- NBDExport *exp;
-
- if (length) {
- if (nbd_negotiate_drop_sync(client->ioc, length) != length) {
- return -EIO;
- }
- return nbd_negotiate_send_rep(client->ioc,
- NBD_REP_ERR_INVALID, NBD_OPT_LIST);
- }
-
- /* For each export, send a NBD_REP_SERVER reply. */
- QTAILQ_FOREACH(exp, &exports, next) {
- if (nbd_negotiate_send_rep_list(client->ioc, exp)) {
- return -EINVAL;
- }
- }
- /* Finish with a NBD_REP_ACK. */
- return nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK, NBD_OPT_LIST);
-}
-
-static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length)
-{
- int rc = -EINVAL;
- char name[256];
-
- /* Client sends:
- [20 .. xx] export name (length bytes)
- */
- TRACE("Checking length");
- if (length > 255) {
- LOG("Bad length received");
- goto fail;
- }
- if (nbd_negotiate_read(client->ioc, name, length) != length) {
- LOG("read failed");
- goto fail;
- }
- name[length] = '\0';
-
- TRACE("Client requested export '%s'", name);
-
- client->exp = nbd_export_find(name);
- if (!client->exp) {
- LOG("export not found");
- goto fail;
- }
-
- QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
- nbd_export_get(client->exp);
- rc = 0;
-fail:
- return rc;
-}
-
-
-static QIOChannel *nbd_negotiate_handle_starttls(NBDClient *client,
- uint32_t length)
-{
- QIOChannel *ioc;
- QIOChannelTLS *tioc;
- struct NBDTLSHandshakeData data = { 0 };
-
- TRACE("Setting up TLS");
- ioc = client->ioc;
- if (length) {
- if (nbd_negotiate_drop_sync(ioc, length) != length) {
- return NULL;
- }
- nbd_negotiate_send_rep(ioc, NBD_REP_ERR_INVALID, NBD_OPT_STARTTLS);
- return NULL;
- }
-
- nbd_negotiate_send_rep(client->ioc, NBD_REP_ACK, NBD_OPT_STARTTLS);
-
- tioc = qio_channel_tls_new_server(ioc,
- client->tlscreds,
- client->tlsaclname,
- NULL);
- if (!tioc) {
- return NULL;
- }
-
- TRACE("Starting TLS handshake");
- data.loop = g_main_loop_new(g_main_context_default(), FALSE);
- qio_channel_tls_handshake(tioc,
- nbd_tls_handshake,
- &data,
- NULL);
-
- if (!data.complete) {
- g_main_loop_run(data.loop);
- }
- g_main_loop_unref(data.loop);
- if (data.error) {
- object_unref(OBJECT(tioc));
- error_free(data.error);
- return NULL;
- }
-
- return QIO_CHANNEL(tioc);
-}
-
-
-static int nbd_negotiate_options(NBDClient *client)
-{
- uint32_t flags;
- bool fixedNewstyle = false;
-
- /* Client sends:
- [ 0 .. 3] client flags
-
- [ 0 .. 7] NBD_OPTS_MAGIC
- [ 8 .. 11] NBD option
- [12 .. 15] Data length
- ... Rest of request
-
- [ 0 .. 7] NBD_OPTS_MAGIC
- [ 8 .. 11] Second NBD option
- [12 .. 15] Data length
- ... Rest of request
- */
-
- if (nbd_negotiate_read(client->ioc, &flags, sizeof(flags)) !=
- sizeof(flags)) {
- LOG("read failed");
- return -EIO;
- }
- TRACE("Checking client flags");
- be32_to_cpus(&flags);
- if (flags & NBD_FLAG_C_FIXED_NEWSTYLE) {
- TRACE("Support supports fixed newstyle handshake");
- fixedNewstyle = true;
- flags &= ~NBD_FLAG_C_FIXED_NEWSTYLE;
- }
- if (flags != 0) {
- TRACE("Unknown client flags 0x%x received", flags);
- return -EIO;
- }
-
- while (1) {
- int ret;
- uint32_t clientflags, length;
- uint64_t magic;
-
- if (nbd_negotiate_read(client->ioc, &magic, sizeof(magic)) !=
- sizeof(magic)) {
- LOG("read failed");
- return -EINVAL;
- }
- TRACE("Checking opts magic");
- if (magic != be64_to_cpu(NBD_OPTS_MAGIC)) {
- LOG("Bad magic received");
- return -EINVAL;
- }
-
- if (nbd_negotiate_read(client->ioc, &clientflags,
- sizeof(clientflags)) != sizeof(clientflags)) {
- LOG("read failed");
- return -EINVAL;
- }
- clientflags = be32_to_cpu(clientflags);
-
- if (nbd_negotiate_read(client->ioc, &length, sizeof(length)) !=
- sizeof(length)) {
- LOG("read failed");
- return -EINVAL;
- }
- length = be32_to_cpu(length);
-
- TRACE("Checking option 0x%x", clientflags);
- if (client->tlscreds &&
- client->ioc == (QIOChannel *)client->sioc) {
- QIOChannel *tioc;
- if (!fixedNewstyle) {
- TRACE("Unsupported option 0x%x", clientflags);
- return -EINVAL;
- }
- switch (clientflags) {
- case NBD_OPT_STARTTLS:
- tioc = nbd_negotiate_handle_starttls(client, length);
- if (!tioc) {
- return -EIO;
- }
- object_unref(OBJECT(client->ioc));
- client->ioc = QIO_CHANNEL(tioc);
- break;
-
- case NBD_OPT_EXPORT_NAME:
- /* No way to return an error to client, so drop connection */
- TRACE("Option 0x%x not permitted before TLS", clientflags);
- return -EINVAL;
-
- default:
- TRACE("Option 0x%x not permitted before TLS", clientflags);
- if (nbd_negotiate_drop_sync(client->ioc, length) != length) {
- return -EIO;
- }
- nbd_negotiate_send_rep(client->ioc, NBD_REP_ERR_TLS_REQD,
- clientflags);
- break;
- }
- } else if (fixedNewstyle) {
- switch (clientflags) {
- case NBD_OPT_LIST:
- ret = nbd_negotiate_handle_list(client, length);
- if (ret < 0) {
- return ret;
- }
- break;
-
- case NBD_OPT_ABORT:
- return -EINVAL;
-
- case NBD_OPT_EXPORT_NAME:
- return nbd_negotiate_handle_export_name(client, length);
-
- case NBD_OPT_STARTTLS:
- if (nbd_negotiate_drop_sync(client->ioc, length) != length) {
- return -EIO;
- }
- if (client->tlscreds) {
- TRACE("TLS already enabled");
- nbd_negotiate_send_rep(client->ioc, NBD_REP_ERR_INVALID,
- clientflags);
- } else {
- TRACE("TLS not configured");
- nbd_negotiate_send_rep(client->ioc, NBD_REP_ERR_POLICY,
- clientflags);
- }
- break;
- default:
- TRACE("Unsupported option 0x%x", clientflags);
- if (nbd_negotiate_drop_sync(client->ioc, length) != length) {
- return -EIO;
- }
- nbd_negotiate_send_rep(client->ioc, NBD_REP_ERR_UNSUP,
- clientflags);
- break;
- }
- } else {
- /*
- * If broken new-style we should drop the connection
- * for anything except NBD_OPT_EXPORT_NAME
- */
- switch (clientflags) {
- case NBD_OPT_EXPORT_NAME:
- return nbd_negotiate_handle_export_name(client, length);
-
- default:
- TRACE("Unsupported option 0x%x", clientflags);
- return -EINVAL;
- }
- }
- }
-}
-
-typedef struct {
- NBDClient *client;
- Coroutine *co;
-} NBDClientNewData;
-
-static coroutine_fn int nbd_negotiate(NBDClientNewData *data)
-{
- NBDClient *client = data->client;
- char buf[8 + 8 + 8 + 128];
- int rc;
- const int myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM |
- NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA);
- bool oldStyle;
-
- /* Old style negotiation header without options
- [ 0 .. 7] passwd ("NBDMAGIC")
- [ 8 .. 15] magic (NBD_CLIENT_MAGIC)
- [16 .. 23] size
- [24 .. 25] server flags (0)
- [26 .. 27] export flags
- [28 .. 151] reserved (0)
-
- New style negotiation header with options
- [ 0 .. 7] passwd ("NBDMAGIC")
- [ 8 .. 15] magic (NBD_OPTS_MAGIC)
- [16 .. 17] server flags (0)
- ....options sent....
- [18 .. 25] size
- [26 .. 27] export flags
- [28 .. 151] reserved (0)
- */
-
- qio_channel_set_blocking(client->ioc, false, NULL);
- rc = -EINVAL;
-
- TRACE("Beginning negotiation.");
- memset(buf, 0, sizeof(buf));
- memcpy(buf, "NBDMAGIC", 8);
-
- oldStyle = client->exp != NULL && !client->tlscreds;
- if (oldStyle) {
- assert ((client->exp->nbdflags & ~65535) == 0);
- stq_be_p(buf + 8, NBD_CLIENT_MAGIC);
- stq_be_p(buf + 16, client->exp->size);
- stw_be_p(buf + 26, client->exp->nbdflags | myflags);
- } else {
- stq_be_p(buf + 8, NBD_OPTS_MAGIC);
- stw_be_p(buf + 16, NBD_FLAG_FIXED_NEWSTYLE);
- }
-
- if (oldStyle) {
- if (client->tlscreds) {
- TRACE("TLS cannot be enabled with oldstyle protocol");
- goto fail;
- }
- if (nbd_negotiate_write(client->ioc, buf, sizeof(buf)) != sizeof(buf)) {
- LOG("write failed");
- goto fail;
- }
- } else {
- if (nbd_negotiate_write(client->ioc, buf, 18) != 18) {
- LOG("write failed");
- goto fail;
- }
- rc = nbd_negotiate_options(client);
- if (rc != 0) {
- LOG("option negotiation failed");
- goto fail;
- }
-
- assert ((client->exp->nbdflags & ~65535) == 0);
- stq_be_p(buf + 18, client->exp->size);
- stw_be_p(buf + 26, client->exp->nbdflags | myflags);
- if (nbd_negotiate_write(client->ioc, buf + 18, sizeof(buf) - 18) !=
- sizeof(buf) - 18) {
- LOG("write failed");
- goto fail;
- }
- }
-
- TRACE("Negotiation succeeded.");
- rc = 0;
-fail:
- return rc;
-}
-
-#ifdef __linux__
-
-int nbd_disconnect(int fd)
-{
- ioctl(fd, NBD_CLEAR_QUE);
- ioctl(fd, NBD_DISCONNECT);
- ioctl(fd, NBD_CLEAR_SOCK);
- return 0;
-}
-
-#else
-
-int nbd_disconnect(int fd)
-{
- return -ENOTSUP;
-}
-#endif
-
-static ssize_t nbd_receive_request(QIOChannel *ioc, struct nbd_request *request)
-{
- uint8_t buf[NBD_REQUEST_SIZE];
- uint32_t magic;
- ssize_t ret;
-
- ret = read_sync(ioc, buf, sizeof(buf));
- if (ret < 0) {
- return ret;
- }
-
- if (ret != sizeof(buf)) {
- LOG("read failed");
- return -EINVAL;
- }
-
- /* Request
- [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
- [ 4 .. 7] type (0 == READ, 1 == WRITE)
- [ 8 .. 15] handle
- [16 .. 23] from
- [24 .. 27] len
- */
-
- magic = be32_to_cpup((uint32_t*)buf);
- request->type = be32_to_cpup((uint32_t*)(buf + 4));
- request->handle = be64_to_cpup((uint64_t*)(buf + 8));
- request->from = be64_to_cpup((uint64_t*)(buf + 16));
- request->len = be32_to_cpup((uint32_t*)(buf + 24));
-
- TRACE("Got request: "
- "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }",
- magic, request->type, request->from, request->len);
-
- if (magic != NBD_REQUEST_MAGIC) {
- LOG("invalid magic (got 0x%x)", magic);
- return -EINVAL;
- }
- return 0;
-}
-
-static ssize_t nbd_send_reply(QIOChannel *ioc, struct nbd_reply *reply)
-{
- uint8_t buf[NBD_REPLY_SIZE];
- ssize_t ret;
-
- reply->error = system_errno_to_nbd_errno(reply->error);
-
- TRACE("Sending response to client: { .error = %d, handle = %" PRIu64 " }",
- reply->error, reply->handle);
-
- /* Reply
- [ 0 .. 3] magic (NBD_REPLY_MAGIC)
- [ 4 .. 7] error (0 == no error)
- [ 7 .. 15] handle
- */
- stl_be_p(buf, NBD_REPLY_MAGIC);
- stl_be_p(buf + 4, reply->error);
- stq_be_p(buf + 8, reply->handle);
-
- ret = write_sync(ioc, buf, sizeof(buf));
- if (ret < 0) {
- return ret;
- }
-
- if (ret != sizeof(buf)) {
- LOG("writing to socket failed");
- return -EINVAL;
- }
- return 0;
-}
-
-#define MAX_NBD_REQUESTS 16
-
-void nbd_client_get(NBDClient *client)
-{
- client->refcount++;
-}
-
-void nbd_client_put(NBDClient *client)
-{
- if (--client->refcount == 0) {
- /* The last reference should be dropped by client->close,
- * which is called by client_close.
- */
- assert(client->closing);
-
- nbd_unset_handlers(client);
- object_unref(OBJECT(client->sioc));
- object_unref(OBJECT(client->ioc));
- if (client->tlscreds) {
- object_unref(OBJECT(client->tlscreds));
- }
- g_free(client->tlsaclname);
- if (client->exp) {
- QTAILQ_REMOVE(&client->exp->clients, client, next);
- nbd_export_put(client->exp);
- }
- g_free(client);
- }
-}
-
-static void client_close(NBDClient *client)
-{
- if (client->closing) {
- return;
- }
-
- client->closing = true;
-
- /* Force requests to finish. They will drop their own references,
- * then we'll close the socket and free the NBDClient.
- */
- qio_channel_shutdown(client->ioc, QIO_CHANNEL_SHUTDOWN_BOTH,
- NULL);
-
- /* Also tell the client, so that they release their reference. */
- if (client->close) {
- client->close(client);
- }
-}
-
-static NBDRequest *nbd_request_get(NBDClient *client)
-{
- NBDRequest *req;
-
- assert(client->nb_requests <= MAX_NBD_REQUESTS - 1);
- client->nb_requests++;
- nbd_update_can_read(client);
-
- req = g_new0(NBDRequest, 1);
- nbd_client_get(client);
- req->client = client;
- return req;
-}
-
-static void nbd_request_put(NBDRequest *req)
-{
- NBDClient *client = req->client;
-
- if (req->data) {
- qemu_vfree(req->data);
- }
- g_free(req);
-
- client->nb_requests--;
- nbd_update_can_read(client);
- nbd_client_put(client);
-}
-
-static void blk_aio_attached(AioContext *ctx, void *opaque)
-{
- NBDExport *exp = opaque;
- NBDClient *client;
-
- TRACE("Export %s: Attaching clients to AIO context %p\n", exp->name, ctx);
-
- exp->ctx = ctx;
-
- QTAILQ_FOREACH(client, &exp->clients, next) {
- nbd_set_handlers(client);
- }
-}
-
-static void blk_aio_detach(void *opaque)
-{
- NBDExport *exp = opaque;
- NBDClient *client;
-
- TRACE("Export %s: Detaching clients from AIO context %p\n", exp->name, exp->ctx);
-
- QTAILQ_FOREACH(client, &exp->clients, next) {
- nbd_unset_handlers(client);
- }
-
- exp->ctx = NULL;
-}
-
-static void nbd_eject_notifier(Notifier *n, void *data)
-{
- NBDExport *exp = container_of(n, NBDExport, eject_notifier);
- nbd_export_close(exp);
-}
-
-NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size,
- uint32_t nbdflags, void (*close)(NBDExport *),
- Error **errp)
-{
- NBDExport *exp = g_malloc0(sizeof(NBDExport));
- exp->refcount = 1;
- QTAILQ_INIT(&exp->clients);
- exp->blk = blk;
- exp->dev_offset = dev_offset;
- exp->nbdflags = nbdflags;
- exp->size = size < 0 ? blk_getlength(blk) : size;
- if (exp->size < 0) {
- error_setg_errno(errp, -exp->size,
- "Failed to determine the NBD export's length");
- goto fail;
- }
- exp->size -= exp->size % BDRV_SECTOR_SIZE;
-
- exp->close = close;
- exp->ctx = blk_get_aio_context(blk);
- blk_ref(blk);
- blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp);
-
- exp->eject_notifier.notify = nbd_eject_notifier;
- blk_add_remove_bs_notifier(blk, &exp->eject_notifier);
-
- /*
- * NBD exports are used for non-shared storage migration. Make sure
- * that BDRV_O_INACTIVE is cleared and the image is ready for write
- * access since the export could be available before migration handover.
- */
- aio_context_acquire(exp->ctx);
- blk_invalidate_cache(blk, NULL);
- aio_context_release(exp->ctx);
- return exp;
-
-fail:
- g_free(exp);
- return NULL;
-}
-
-NBDExport *nbd_export_find(const char *name)
-{
- NBDExport *exp;
- QTAILQ_FOREACH(exp, &exports, next) {
- if (strcmp(name, exp->name) == 0) {
- return exp;
- }
- }
-
- return NULL;
-}
-
-void nbd_export_set_name(NBDExport *exp, const char *name)
-{
- if (exp->name == name) {
- return;
- }
-
- nbd_export_get(exp);
- if (exp->name != NULL) {
- g_free(exp->name);
- exp->name = NULL;
- QTAILQ_REMOVE(&exports, exp, next);
- nbd_export_put(exp);
- }
- if (name != NULL) {
- nbd_export_get(exp);
- exp->name = g_strdup(name);
- QTAILQ_INSERT_TAIL(&exports, exp, next);
- }
- nbd_export_put(exp);
-}
-
-void nbd_export_close(NBDExport *exp)
-{
- NBDClient *client, *next;
-
- nbd_export_get(exp);
- QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) {
- client_close(client);
- }
- nbd_export_set_name(exp, NULL);
- nbd_export_put(exp);
-}
-
-void nbd_export_get(NBDExport *exp)
-{
- assert(exp->refcount > 0);
- exp->refcount++;
-}
-
-void nbd_export_put(NBDExport *exp)
-{
- assert(exp->refcount > 0);
- if (exp->refcount == 1) {
- nbd_export_close(exp);
- }
-
- if (--exp->refcount == 0) {
- assert(exp->name == NULL);
-
- if (exp->close) {
- exp->close(exp);
- }
-
- if (exp->blk) {
- notifier_remove(&exp->eject_notifier);
- blk_remove_aio_context_notifier(exp->blk, blk_aio_attached,
- blk_aio_detach, exp);
- blk_unref(exp->blk);
- exp->blk = NULL;
- }
-
- g_free(exp);
- }
-}
-
-BlockBackend *nbd_export_get_blockdev(NBDExport *exp)
-{
- return exp->blk;
-}
-
-void nbd_export_close_all(void)
-{
- NBDExport *exp, *next;
-
- QTAILQ_FOREACH_SAFE(exp, &exports, next, next) {
- nbd_export_close(exp);
- }
-}
-
-static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply,
- int len)
-{
- NBDClient *client = req->client;
- ssize_t rc, ret;
-
- g_assert(qemu_in_coroutine());
- qemu_co_mutex_lock(&client->send_lock);
- client->send_coroutine = qemu_coroutine_self();
- nbd_set_handlers(client);
-
- if (!len) {
- rc = nbd_send_reply(client->ioc, reply);
- } else {
- qio_channel_set_cork(client->ioc, true);
- rc = nbd_send_reply(client->ioc, reply);
- if (rc >= 0) {
- ret = write_sync(client->ioc, req->data, len);
- if (ret != len) {
- rc = -EIO;
- }
- }
- qio_channel_set_cork(client->ioc, false);
- }
-
- client->send_coroutine = NULL;
- nbd_set_handlers(client);
- qemu_co_mutex_unlock(&client->send_lock);
- return rc;
-}
-
-static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request)
-{
- NBDClient *client = req->client;
- uint32_t command;
- ssize_t rc;
-
- g_assert(qemu_in_coroutine());
- client->recv_coroutine = qemu_coroutine_self();
- nbd_update_can_read(client);
-
- rc = nbd_receive_request(client->ioc, request);
- if (rc < 0) {
- if (rc != -EAGAIN) {
- rc = -EIO;
- }
- goto out;
- }
-
- if ((request->from + request->len) < request->from) {
- LOG("integer overflow detected! "
- "you're probably being attacked");
- rc = -EINVAL;
- goto out;
- }
-
- TRACE("Decoding type");
-
- command = request->type & NBD_CMD_MASK_COMMAND;
- if (command == NBD_CMD_READ || command == NBD_CMD_WRITE) {
- if (request->len > NBD_MAX_BUFFER_SIZE) {
- LOG("len (%u) is larger than max len (%u)",
- request->len, NBD_MAX_BUFFER_SIZE);
- rc = -EINVAL;
- goto out;
- }
-
- req->data = blk_try_blockalign(client->exp->blk, request->len);
- if (req->data == NULL) {
- rc = -ENOMEM;
- goto out;
- }
- }
- if (command == NBD_CMD_WRITE) {
- TRACE("Reading %u byte(s)", request->len);
-
- if (read_sync(client->ioc, req->data, request->len) != request->len) {
- LOG("reading from socket failed");
- rc = -EIO;
- goto out;
- }
- }
- rc = 0;
-
-out:
- client->recv_coroutine = NULL;
- nbd_update_can_read(client);
-
- return rc;
-}
-
-static void nbd_trip(void *opaque)
-{
- NBDClient *client = opaque;
- NBDExport *exp = client->exp;
- NBDRequest *req;
- struct nbd_request request;
- struct nbd_reply reply;
- ssize_t ret;
- uint32_t command;
-
- TRACE("Reading request.");
- if (client->closing) {
- return;
- }
-
- req = nbd_request_get(client);
- ret = nbd_co_receive_request(req, &request);
- if (ret == -EAGAIN) {
- goto done;
- }
- if (ret == -EIO) {
- goto out;
- }
-
- reply.handle = request.handle;
- reply.error = 0;
-
- if (ret < 0) {
- reply.error = -ret;
- goto error_reply;
- }
- command = request.type & NBD_CMD_MASK_COMMAND;
- if (command != NBD_CMD_DISC && (request.from + request.len) > exp->size) {
- LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
- ", Offset: %" PRIu64 "\n",
- request.from, request.len,
- (uint64_t)exp->size, (uint64_t)exp->dev_offset);
- LOG("requested operation past EOF--bad client?");
- goto invalid_request;
- }
-
- if (client->closing) {
- /*
- * The client may be closed when we are blocked in
- * nbd_co_receive_request()
- */
- goto done;
- }
-
- switch (command) {
- case NBD_CMD_READ:
- TRACE("Request type is READ");
-
- if (request.type & NBD_CMD_FLAG_FUA) {
- ret = blk_co_flush(exp->blk);
- if (ret < 0) {
- LOG("flush failed");
- reply.error = -ret;
- goto error_reply;
- }
- }
-
- ret = blk_pread(exp->blk, request.from + exp->dev_offset,
- req->data, request.len);
- if (ret < 0) {
- LOG("reading from file failed");
- reply.error = -ret;
- goto error_reply;
- }
-
- TRACE("Read %u byte(s)", request.len);
- if (nbd_co_send_reply(req, &reply, request.len) < 0)
- goto out;
- break;
- case NBD_CMD_WRITE:
- TRACE("Request type is WRITE");
-
- if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
- TRACE("Server is read-only, return error");
- reply.error = EROFS;
- goto error_reply;
- }
-
- TRACE("Writing to device");
-
- ret = blk_pwrite(exp->blk, request.from + exp->dev_offset,
- req->data, request.len);
- if (ret < 0) {
- LOG("writing to file failed");
- reply.error = -ret;
- goto error_reply;
- }
-
- if (request.type & NBD_CMD_FLAG_FUA) {
- ret = blk_co_flush(exp->blk);
- if (ret < 0) {
- LOG("flush failed");
- reply.error = -ret;
- goto error_reply;
- }
- }
-
- if (nbd_co_send_reply(req, &reply, 0) < 0) {
- goto out;
- }
- break;
- case NBD_CMD_DISC:
- TRACE("Request type is DISCONNECT");
- errno = 0;
- goto out;
- case NBD_CMD_FLUSH:
- TRACE("Request type is FLUSH");
-
- ret = blk_co_flush(exp->blk);
- if (ret < 0) {
- LOG("flush failed");
- reply.error = -ret;
- }
- if (nbd_co_send_reply(req, &reply, 0) < 0) {
- goto out;
- }
- break;
- case NBD_CMD_TRIM:
- TRACE("Request type is TRIM");
- ret = blk_co_discard(exp->blk, (request.from + exp->dev_offset)
- / BDRV_SECTOR_SIZE,
- request.len / BDRV_SECTOR_SIZE);
- if (ret < 0) {
- LOG("discard failed");
- reply.error = -ret;
- }
- if (nbd_co_send_reply(req, &reply, 0) < 0) {
- goto out;
- }
- break;
- default:
- LOG("invalid request type (%u) received", request.type);
- invalid_request:
- reply.error = EINVAL;
- error_reply:
- if (nbd_co_send_reply(req, &reply, 0) < 0) {
- goto out;
- }
- break;
- }
-
- TRACE("Request/Reply complete");
-
-done:
- nbd_request_put(req);
- return;
-
-out:
- nbd_request_put(req);
- client_close(client);
-}
-
-static void nbd_read(void *opaque)
-{
- NBDClient *client = opaque;
-
- if (client->recv_coroutine) {
- qemu_coroutine_enter(client->recv_coroutine, NULL);
- } else {
- qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client);
- }
-}
-
-static void nbd_restart_write(void *opaque)
-{
- NBDClient *client = opaque;
-
- qemu_coroutine_enter(client->send_coroutine, NULL);
-}
-
-static void nbd_set_handlers(NBDClient *client)
-{
- if (client->exp && client->exp->ctx) {
- aio_set_fd_handler(client->exp->ctx, client->sioc->fd,
- true,
- client->can_read ? nbd_read : NULL,
- client->send_coroutine ? nbd_restart_write : NULL,
- client);
- }
-}
-
-static void nbd_unset_handlers(NBDClient *client)
-{
- if (client->exp && client->exp->ctx) {
- aio_set_fd_handler(client->exp->ctx, client->sioc->fd,
- true, NULL, NULL, NULL);
- }
-}
-
-static void nbd_update_can_read(NBDClient *client)
-{
- bool can_read = client->recv_coroutine ||
- client->nb_requests < MAX_NBD_REQUESTS;
-
- if (can_read != client->can_read) {
- client->can_read = can_read;
- nbd_set_handlers(client);
-
- /* There is no need to invoke aio_notify(), since aio_set_fd_handler()
- * in nbd_set_handlers() will have taken care of that */
- }
-}
-
-static coroutine_fn void nbd_co_client_start(void *opaque)
-{
- NBDClientNewData *data = opaque;
- NBDClient *client = data->client;
- NBDExport *exp = client->exp;
-
- if (exp) {
- nbd_export_get(exp);
- }
- if (nbd_negotiate(data)) {
- client_close(client);
- goto out;
- }
- qemu_co_mutex_init(&client->send_lock);
- nbd_set_handlers(client);
-
- if (exp) {
- QTAILQ_INSERT_TAIL(&exp->clients, client, next);
- }
-out:
- g_free(data);
-}
-
-void nbd_client_new(NBDExport *exp,
- QIOChannelSocket *sioc,
- QCryptoTLSCreds *tlscreds,
- const char *tlsaclname,
- void (*close_fn)(NBDClient *))
-{
- NBDClient *client;
- NBDClientNewData *data = g_new(NBDClientNewData, 1);
-
- client = g_malloc0(sizeof(NBDClient));
- client->refcount = 1;
- client->exp = exp;
- client->tlscreds = tlscreds;
- if (tlscreds) {
- object_ref(OBJECT(client->tlscreds));
- }
- client->tlsaclname = g_strdup(tlsaclname);
- client->sioc = sioc;
- object_ref(OBJECT(client->sioc));
- client->ioc = QIO_CHANNEL(sioc);
- object_ref(OBJECT(client->ioc));
- client->can_read = true;
- client->close = close_fn;
-
- data->client = client;
- data->co = qemu_coroutine_create(nbd_co_client_start);
- qemu_coroutine_enter(data->co, data);
-}