From bb756eebdac6fd24e8919e2c43f7d2c8c4091f59 Mon Sep 17 00:00:00 2001 From: RajithaY Date: Tue, 25 Apr 2017 03:31:15 -0700 Subject: 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 --- qemu/nbd/server.c | 1290 ----------------------------------------------------- 1 file changed, 1290 deletions(-) delete mode 100644 qemu/nbd/server.c (limited to 'qemu/nbd/server.c') 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 - * - * 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 . - */ - -#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); -} -- cgit 1.2.3-korg