| /* |
| * QEMU Block driver for NBD |
| * |
| * Copyright (c) 2019 Virtuozzo International GmbH. |
| * Copyright Red Hat |
| * Copyright (C) 2008 Bull S.A.S. |
| * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
| * |
| * Some parts: |
| * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu/osdep.h" |
| |
| #include "trace.h" |
| #include "qemu/uri.h" |
| #include "qemu/option.h" |
| #include "qemu/cutils.h" |
| #include "qemu/main-loop.h" |
| |
| #include "qapi/qapi-visit-sockets.h" |
| #include "qapi/qmp/qstring.h" |
| #include "qapi/clone-visitor.h" |
| |
| #include "block/qdict.h" |
| #include "block/nbd.h" |
| #include "block/block_int.h" |
| #include "block/coroutines.h" |
| |
| #include "qemu/yank.h" |
| |
| #define EN_OPTSTR ":exportname=" |
| #define MAX_NBD_REQUESTS 16 |
| |
| #define COOKIE_TO_INDEX(cookie) ((cookie) - 1) |
| #define INDEX_TO_COOKIE(index) ((index) + 1) |
| |
| typedef struct { |
| Coroutine *coroutine; |
| uint64_t offset; /* original offset of the request */ |
| bool receiving; /* sleeping in the yield in nbd_receive_replies */ |
| } NBDClientRequest; |
| |
| typedef enum NBDClientState { |
| NBD_CLIENT_CONNECTING_WAIT, |
| NBD_CLIENT_CONNECTING_NOWAIT, |
| NBD_CLIENT_CONNECTED, |
| NBD_CLIENT_QUIT |
| } NBDClientState; |
| |
| typedef struct BDRVNBDState { |
| QIOChannel *ioc; /* The current I/O channel */ |
| NBDExportInfo info; |
| |
| /* |
| * Protects state, free_sema, in_flight, requests[].coroutine, |
| * reconnect_delay_timer. |
| */ |
| QemuMutex requests_lock; |
| NBDClientState state; |
| CoQueue free_sema; |
| unsigned in_flight; |
| NBDClientRequest requests[MAX_NBD_REQUESTS]; |
| QEMUTimer *reconnect_delay_timer; |
| |
| /* Protects sending data on the socket. */ |
| CoMutex send_mutex; |
| |
| /* |
| * Protects receiving reply headers from the socket, as well as the |
| * fields reply and requests[].receiving |
| */ |
| CoMutex receive_mutex; |
| NBDReply reply; |
| |
| QEMUTimer *open_timer; |
| |
| BlockDriverState *bs; |
| |
| /* Connection parameters */ |
| uint32_t reconnect_delay; |
| uint32_t open_timeout; |
| SocketAddress *saddr; |
| char *export; |
| char *tlscredsid; |
| QCryptoTLSCreds *tlscreds; |
| char *tlshostname; |
| char *x_dirty_bitmap; |
| bool alloc_depth; |
| |
| NBDClientConnection *conn; |
| } BDRVNBDState; |
| |
| static void nbd_yank(void *opaque); |
| |
| static void nbd_clear_bdrvstate(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| nbd_client_connection_release(s->conn); |
| s->conn = NULL; |
| |
| yank_unregister_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name)); |
| |
| /* Must not leave timers behind that would access freed data */ |
| assert(!s->reconnect_delay_timer); |
| assert(!s->open_timer); |
| |
| object_unref(OBJECT(s->tlscreds)); |
| qapi_free_SocketAddress(s->saddr); |
| s->saddr = NULL; |
| g_free(s->export); |
| s->export = NULL; |
| g_free(s->tlscredsid); |
| s->tlscredsid = NULL; |
| g_free(s->tlshostname); |
| s->tlshostname = NULL; |
| g_free(s->x_dirty_bitmap); |
| s->x_dirty_bitmap = NULL; |
| } |
| |
| /* Called with s->receive_mutex taken. */ |
| static bool coroutine_fn nbd_recv_coroutine_wake_one(NBDClientRequest *req) |
| { |
| if (req->receiving) { |
| req->receiving = false; |
| aio_co_wake(req->coroutine); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void coroutine_fn nbd_recv_coroutines_wake(BDRVNBDState *s) |
| { |
| int i; |
| |
| QEMU_LOCK_GUARD(&s->receive_mutex); |
| for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
| if (nbd_recv_coroutine_wake_one(&s->requests[i])) { |
| return; |
| } |
| } |
| } |
| |
| /* Called with s->requests_lock held. */ |
| static void coroutine_fn nbd_channel_error_locked(BDRVNBDState *s, int ret) |
| { |
| if (s->state == NBD_CLIENT_CONNECTED) { |
| qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| } |
| |
| if (ret == -EIO) { |
| if (s->state == NBD_CLIENT_CONNECTED) { |
| s->state = s->reconnect_delay ? NBD_CLIENT_CONNECTING_WAIT : |
| NBD_CLIENT_CONNECTING_NOWAIT; |
| } |
| } else { |
| s->state = NBD_CLIENT_QUIT; |
| } |
| } |
| |
| static void coroutine_fn nbd_channel_error(BDRVNBDState *s, int ret) |
| { |
| QEMU_LOCK_GUARD(&s->requests_lock); |
| nbd_channel_error_locked(s, ret); |
| } |
| |
| static void reconnect_delay_timer_del(BDRVNBDState *s) |
| { |
| if (s->reconnect_delay_timer) { |
| timer_free(s->reconnect_delay_timer); |
| s->reconnect_delay_timer = NULL; |
| } |
| } |
| |
| static void reconnect_delay_timer_cb(void *opaque) |
| { |
| BDRVNBDState *s = opaque; |
| |
| reconnect_delay_timer_del(s); |
| WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| if (s->state != NBD_CLIENT_CONNECTING_WAIT) { |
| return; |
| } |
| s->state = NBD_CLIENT_CONNECTING_NOWAIT; |
| } |
| nbd_co_establish_connection_cancel(s->conn); |
| } |
| |
| static void reconnect_delay_timer_init(BDRVNBDState *s, uint64_t expire_time_ns) |
| { |
| assert(!s->reconnect_delay_timer); |
| s->reconnect_delay_timer = aio_timer_new(bdrv_get_aio_context(s->bs), |
| QEMU_CLOCK_REALTIME, |
| SCALE_NS, |
| reconnect_delay_timer_cb, s); |
| timer_mod(s->reconnect_delay_timer, expire_time_ns); |
| } |
| |
| static void nbd_teardown_connection(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| assert(!s->in_flight); |
| |
| if (s->ioc) { |
| qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| nbd_yank, s->bs); |
| object_unref(OBJECT(s->ioc)); |
| s->ioc = NULL; |
| } |
| |
| WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| s->state = NBD_CLIENT_QUIT; |
| } |
| } |
| |
| static void open_timer_del(BDRVNBDState *s) |
| { |
| if (s->open_timer) { |
| timer_free(s->open_timer); |
| s->open_timer = NULL; |
| } |
| } |
| |
| static void open_timer_cb(void *opaque) |
| { |
| BDRVNBDState *s = opaque; |
| |
| nbd_co_establish_connection_cancel(s->conn); |
| open_timer_del(s); |
| } |
| |
| static void open_timer_init(BDRVNBDState *s, uint64_t expire_time_ns) |
| { |
| assert(!s->open_timer); |
| s->open_timer = aio_timer_new(bdrv_get_aio_context(s->bs), |
| QEMU_CLOCK_REALTIME, |
| SCALE_NS, |
| open_timer_cb, s); |
| timer_mod(s->open_timer, expire_time_ns); |
| } |
| |
| static bool nbd_client_will_reconnect(BDRVNBDState *s) |
| { |
| /* |
| * Called only after a socket error, so this is not performance sensitive. |
| */ |
| QEMU_LOCK_GUARD(&s->requests_lock); |
| return s->state == NBD_CLIENT_CONNECTING_WAIT; |
| } |
| |
| /* |
| * Update @bs with information learned during a completed negotiation process. |
| * Return failure if the server's advertised options are incompatible with the |
| * client's needs. |
| */ |
| static int nbd_handle_updated_info(BlockDriverState *bs, Error **errp) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| int ret; |
| |
| if (s->x_dirty_bitmap) { |
| if (!s->info.base_allocation) { |
| error_setg(errp, "requested x-dirty-bitmap %s not found", |
| s->x_dirty_bitmap); |
| return -EINVAL; |
| } |
| if (strcmp(s->x_dirty_bitmap, "qemu:allocation-depth") == 0) { |
| s->alloc_depth = true; |
| } |
| } |
| |
| if (s->info.flags & NBD_FLAG_READ_ONLY) { |
| ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only", errp); |
| if (ret < 0) { |
| return ret; |
| } |
| } |
| |
| if (s->info.flags & NBD_FLAG_SEND_FUA) { |
| bs->supported_write_flags = BDRV_REQ_FUA; |
| bs->supported_zero_flags |= BDRV_REQ_FUA; |
| } |
| |
| if (s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES) { |
| bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP; |
| if (s->info.flags & NBD_FLAG_SEND_FAST_ZERO) { |
| bs->supported_zero_flags |= BDRV_REQ_NO_FALLBACK; |
| } |
| } |
| |
| trace_nbd_client_handshake_success(s->export); |
| |
| return 0; |
| } |
| |
| int coroutine_fn nbd_co_do_establish_connection(BlockDriverState *bs, |
| bool blocking, Error **errp) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| int ret; |
| IO_CODE(); |
| |
| assert_bdrv_graph_readable(); |
| assert(!s->ioc); |
| |
| s->ioc = nbd_co_establish_connection(s->conn, &s->info, blocking, errp); |
| if (!s->ioc) { |
| return -ECONNREFUSED; |
| } |
| |
| yank_register_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), nbd_yank, |
| bs); |
| |
| ret = nbd_handle_updated_info(s->bs, NULL); |
| if (ret < 0) { |
| /* |
| * We have connected, but must fail for other reasons. |
| * Send NBD_CMD_DISC as a courtesy to the server. |
| */ |
| NBDRequest request = { .type = NBD_CMD_DISC }; |
| |
| nbd_send_request(s->ioc, &request); |
| |
| yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| nbd_yank, bs); |
| object_unref(OBJECT(s->ioc)); |
| s->ioc = NULL; |
| |
| return ret; |
| } |
| |
| qio_channel_set_blocking(s->ioc, false, NULL); |
| qio_channel_attach_aio_context(s->ioc, bdrv_get_aio_context(bs)); |
| |
| /* successfully connected */ |
| WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| s->state = NBD_CLIENT_CONNECTED; |
| } |
| |
| return 0; |
| } |
| |
| /* Called with s->requests_lock held. */ |
| static bool nbd_client_connecting(BDRVNBDState *s) |
| { |
| return s->state == NBD_CLIENT_CONNECTING_WAIT || |
| s->state == NBD_CLIENT_CONNECTING_NOWAIT; |
| } |
| |
| /* Called with s->requests_lock taken. */ |
| static void coroutine_fn GRAPH_RDLOCK nbd_reconnect_attempt(BDRVNBDState *s) |
| { |
| int ret; |
| bool blocking = s->state == NBD_CLIENT_CONNECTING_WAIT; |
| |
| /* |
| * Now we are sure that nobody is accessing the channel, and no one will |
| * try until we set the state to CONNECTED. |
| */ |
| assert(nbd_client_connecting(s)); |
| assert(s->in_flight == 1); |
| |
| trace_nbd_reconnect_attempt(s->bs->in_flight); |
| |
| if (blocking && !s->reconnect_delay_timer) { |
| /* |
| * It's the first reconnect attempt after switching to |
| * NBD_CLIENT_CONNECTING_WAIT |
| */ |
| g_assert(s->reconnect_delay); |
| reconnect_delay_timer_init(s, |
| qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + |
| s->reconnect_delay * NANOSECONDS_PER_SECOND); |
| } |
| |
| /* Finalize previous connection if any */ |
| if (s->ioc) { |
| qio_channel_detach_aio_context(s->ioc); |
| yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| nbd_yank, s->bs); |
| object_unref(OBJECT(s->ioc)); |
| s->ioc = NULL; |
| } |
| |
| qemu_mutex_unlock(&s->requests_lock); |
| ret = nbd_co_do_establish_connection(s->bs, blocking, NULL); |
| trace_nbd_reconnect_attempt_result(ret, s->bs->in_flight); |
| qemu_mutex_lock(&s->requests_lock); |
| |
| /* |
| * The reconnect attempt is done (maybe successfully, maybe not), so |
| * we no longer need this timer. Delete it so it will not outlive |
| * this I/O request (so draining removes all timers). |
| */ |
| reconnect_delay_timer_del(s); |
| } |
| |
| static coroutine_fn int nbd_receive_replies(BDRVNBDState *s, uint64_t cookie) |
| { |
| int ret; |
| uint64_t ind = COOKIE_TO_INDEX(cookie), ind2; |
| QEMU_LOCK_GUARD(&s->receive_mutex); |
| |
| while (true) { |
| if (s->reply.cookie == cookie) { |
| /* We are done */ |
| return 0; |
| } |
| |
| if (s->reply.cookie != 0) { |
| /* |
| * Some other request is being handled now. It should already be |
| * woken by whoever set s->reply.cookie (or never wait in this |
| * yield). So, we should not wake it here. |
| */ |
| ind2 = COOKIE_TO_INDEX(s->reply.cookie); |
| assert(!s->requests[ind2].receiving); |
| |
| s->requests[ind].receiving = true; |
| qemu_co_mutex_unlock(&s->receive_mutex); |
| |
| qemu_coroutine_yield(); |
| /* |
| * We may be woken for 2 reasons: |
| * 1. From this function, executing in parallel coroutine, when our |
| * cookie is received. |
| * 2. From nbd_co_receive_one_chunk(), when previous request is |
| * finished and s->reply.cookie set to 0. |
| * Anyway, it's OK to lock the mutex and go to the next iteration. |
| */ |
| |
| qemu_co_mutex_lock(&s->receive_mutex); |
| assert(!s->requests[ind].receiving); |
| continue; |
| } |
| |
| /* We are under mutex and cookie is 0. We have to do the dirty work. */ |
| assert(s->reply.cookie == 0); |
| ret = nbd_receive_reply(s->bs, s->ioc, &s->reply, NULL); |
| if (ret <= 0) { |
| ret = ret ? ret : -EIO; |
| nbd_channel_error(s, ret); |
| return ret; |
| } |
| if (nbd_reply_is_structured(&s->reply) && !s->info.structured_reply) { |
| nbd_channel_error(s, -EINVAL); |
| return -EINVAL; |
| } |
| ind2 = COOKIE_TO_INDEX(s->reply.cookie); |
| if (ind2 >= MAX_NBD_REQUESTS || !s->requests[ind2].coroutine) { |
| nbd_channel_error(s, -EINVAL); |
| return -EINVAL; |
| } |
| if (s->reply.cookie == cookie) { |
| /* We are done */ |
| return 0; |
| } |
| nbd_recv_coroutine_wake_one(&s->requests[ind2]); |
| } |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_co_send_request(BlockDriverState *bs, NBDRequest *request, |
| QEMUIOVector *qiov) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| int rc, i = -1; |
| |
| qemu_mutex_lock(&s->requests_lock); |
| while (s->in_flight == MAX_NBD_REQUESTS || |
| (s->state != NBD_CLIENT_CONNECTED && s->in_flight > 0)) { |
| qemu_co_queue_wait(&s->free_sema, &s->requests_lock); |
| } |
| |
| s->in_flight++; |
| if (s->state != NBD_CLIENT_CONNECTED) { |
| if (nbd_client_connecting(s)) { |
| nbd_reconnect_attempt(s); |
| qemu_co_queue_restart_all(&s->free_sema); |
| } |
| if (s->state != NBD_CLIENT_CONNECTED) { |
| rc = -EIO; |
| goto err; |
| } |
| } |
| |
| for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
| if (s->requests[i].coroutine == NULL) { |
| break; |
| } |
| } |
| |
| assert(i < MAX_NBD_REQUESTS); |
| s->requests[i].coroutine = qemu_coroutine_self(); |
| s->requests[i].offset = request->from; |
| s->requests[i].receiving = false; |
| qemu_mutex_unlock(&s->requests_lock); |
| |
| qemu_co_mutex_lock(&s->send_mutex); |
| request->cookie = INDEX_TO_COOKIE(i); |
| |
| assert(s->ioc); |
| |
| if (qiov) { |
| qio_channel_set_cork(s->ioc, true); |
| rc = nbd_send_request(s->ioc, request); |
| if (rc >= 0 && qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, |
| NULL) < 0) { |
| rc = -EIO; |
| } |
| qio_channel_set_cork(s->ioc, false); |
| } else { |
| rc = nbd_send_request(s->ioc, request); |
| } |
| qemu_co_mutex_unlock(&s->send_mutex); |
| |
| if (rc < 0) { |
| qemu_mutex_lock(&s->requests_lock); |
| err: |
| nbd_channel_error_locked(s, rc); |
| if (i != -1) { |
| s->requests[i].coroutine = NULL; |
| } |
| s->in_flight--; |
| qemu_co_queue_next(&s->free_sema); |
| qemu_mutex_unlock(&s->requests_lock); |
| } |
| return rc; |
| } |
| |
| static inline uint16_t payload_advance16(uint8_t **payload) |
| { |
| *payload += 2; |
| return lduw_be_p(*payload - 2); |
| } |
| |
| static inline uint32_t payload_advance32(uint8_t **payload) |
| { |
| *payload += 4; |
| return ldl_be_p(*payload - 4); |
| } |
| |
| static inline uint64_t payload_advance64(uint8_t **payload) |
| { |
| *payload += 8; |
| return ldq_be_p(*payload - 8); |
| } |
| |
| static int nbd_parse_offset_hole_payload(BDRVNBDState *s, |
| NBDStructuredReplyChunk *chunk, |
| uint8_t *payload, uint64_t orig_offset, |
| QEMUIOVector *qiov, Error **errp) |
| { |
| uint64_t offset; |
| uint32_t hole_size; |
| |
| if (chunk->length != sizeof(offset) + sizeof(hole_size)) { |
| error_setg(errp, "Protocol error: invalid payload for " |
| "NBD_REPLY_TYPE_OFFSET_HOLE"); |
| return -EINVAL; |
| } |
| |
| offset = payload_advance64(&payload); |
| hole_size = payload_advance32(&payload); |
| |
| if (!hole_size || offset < orig_offset || hole_size > qiov->size || |
| offset > orig_offset + qiov->size - hole_size) { |
| error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
| " region"); |
| return -EINVAL; |
| } |
| if (s->info.min_block && |
| !QEMU_IS_ALIGNED(hole_size, s->info.min_block)) { |
| trace_nbd_structured_read_compliance("hole"); |
| } |
| |
| qemu_iovec_memset(qiov, offset - orig_offset, 0, hole_size); |
| |
| return 0; |
| } |
| |
| /* |
| * nbd_parse_blockstatus_payload |
| * Based on our request, we expect only one extent in reply, for the |
| * base:allocation context. |
| */ |
| static int nbd_parse_blockstatus_payload(BDRVNBDState *s, |
| NBDStructuredReplyChunk *chunk, |
| uint8_t *payload, uint64_t orig_length, |
| NBDExtent *extent, Error **errp) |
| { |
| uint32_t context_id; |
| |
| /* The server succeeded, so it must have sent [at least] one extent */ |
| if (chunk->length < sizeof(context_id) + sizeof(*extent)) { |
| error_setg(errp, "Protocol error: invalid payload for " |
| "NBD_REPLY_TYPE_BLOCK_STATUS"); |
| return -EINVAL; |
| } |
| |
| context_id = payload_advance32(&payload); |
| if (s->info.context_id != context_id) { |
| error_setg(errp, "Protocol error: unexpected context id %d for " |
| "NBD_REPLY_TYPE_BLOCK_STATUS, when negotiated context " |
| "id is %d", context_id, |
| s->info.context_id); |
| return -EINVAL; |
| } |
| |
| extent->length = payload_advance32(&payload); |
| extent->flags = payload_advance32(&payload); |
| |
| if (extent->length == 0) { |
| error_setg(errp, "Protocol error: server sent status chunk with " |
| "zero length"); |
| return -EINVAL; |
| } |
| |
| /* |
| * A server sending unaligned block status is in violation of the |
| * protocol, but as qemu-nbd 3.1 is such a server (at least for |
| * POSIX files that are not a multiple of 512 bytes, since qemu |
| * rounds files up to 512-byte multiples but lseek(SEEK_HOLE) |
| * still sees an implicit hole beyond the real EOF), it's nicer to |
| * work around the misbehaving server. If the request included |
| * more than the final unaligned block, truncate it back to an |
| * aligned result; if the request was only the final block, round |
| * up to the full block and change the status to fully-allocated |
| * (always a safe status, even if it loses information). |
| */ |
| if (s->info.min_block && !QEMU_IS_ALIGNED(extent->length, |
| s->info.min_block)) { |
| trace_nbd_parse_blockstatus_compliance("extent length is unaligned"); |
| if (extent->length > s->info.min_block) { |
| extent->length = QEMU_ALIGN_DOWN(extent->length, |
| s->info.min_block); |
| } else { |
| extent->length = s->info.min_block; |
| extent->flags = 0; |
| } |
| } |
| |
| /* |
| * We used NBD_CMD_FLAG_REQ_ONE, so the server should not have |
| * sent us any more than one extent, nor should it have included |
| * status beyond our request in that extent. However, it's easy |
| * enough to ignore the server's noncompliance without killing the |
| * connection; just ignore trailing extents, and clamp things to |
| * the length of our request. |
| */ |
| if (chunk->length > sizeof(context_id) + sizeof(*extent)) { |
| trace_nbd_parse_blockstatus_compliance("more than one extent"); |
| } |
| if (extent->length > orig_length) { |
| extent->length = orig_length; |
| trace_nbd_parse_blockstatus_compliance("extent length too large"); |
| } |
| |
| /* |
| * HACK: if we are using x-dirty-bitmaps to access |
| * qemu:allocation-depth, treat all depths > 2 the same as 2, |
| * since nbd_client_co_block_status is only expecting the low two |
| * bits to be set. |
| */ |
| if (s->alloc_depth && extent->flags > 2) { |
| extent->flags = 2; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * nbd_parse_error_payload |
| * on success @errp contains message describing nbd error reply |
| */ |
| static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk, |
| uint8_t *payload, int *request_ret, |
| Error **errp) |
| { |
| uint32_t error; |
| uint16_t message_size; |
| |
| assert(chunk->type & (1 << 15)); |
| |
| if (chunk->length < sizeof(error) + sizeof(message_size)) { |
| error_setg(errp, |
| "Protocol error: invalid payload for structured error"); |
| return -EINVAL; |
| } |
| |
| error = nbd_errno_to_system_errno(payload_advance32(&payload)); |
| if (error == 0) { |
| error_setg(errp, "Protocol error: server sent structured error chunk " |
| "with error = 0"); |
| return -EINVAL; |
| } |
| |
| *request_ret = -error; |
| message_size = payload_advance16(&payload); |
| |
| if (message_size > chunk->length - sizeof(error) - sizeof(message_size)) { |
| error_setg(errp, "Protocol error: server sent structured error chunk " |
| "with incorrect message size"); |
| return -EINVAL; |
| } |
| |
| /* TODO: Add a trace point to mention the server complaint */ |
| |
| /* TODO handle ERROR_OFFSET */ |
| |
| return 0; |
| } |
| |
| static int coroutine_fn |
| nbd_co_receive_offset_data_payload(BDRVNBDState *s, uint64_t orig_offset, |
| QEMUIOVector *qiov, Error **errp) |
| { |
| QEMUIOVector sub_qiov; |
| uint64_t offset; |
| size_t data_size; |
| int ret; |
| NBDStructuredReplyChunk *chunk = &s->reply.structured; |
| |
| assert(nbd_reply_is_structured(&s->reply)); |
| |
| /* The NBD spec requires at least one byte of payload */ |
| if (chunk->length <= sizeof(offset)) { |
| error_setg(errp, "Protocol error: invalid payload for " |
| "NBD_REPLY_TYPE_OFFSET_DATA"); |
| return -EINVAL; |
| } |
| |
| if (nbd_read64(s->ioc, &offset, "OFFSET_DATA offset", errp) < 0) { |
| return -EIO; |
| } |
| |
| data_size = chunk->length - sizeof(offset); |
| assert(data_size); |
| if (offset < orig_offset || data_size > qiov->size || |
| offset > orig_offset + qiov->size - data_size) { |
| error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
| " region"); |
| return -EINVAL; |
| } |
| if (s->info.min_block && !QEMU_IS_ALIGNED(data_size, s->info.min_block)) { |
| trace_nbd_structured_read_compliance("data"); |
| } |
| |
| qemu_iovec_init(&sub_qiov, qiov->niov); |
| qemu_iovec_concat(&sub_qiov, qiov, offset - orig_offset, data_size); |
| ret = qio_channel_readv_all(s->ioc, sub_qiov.iov, sub_qiov.niov, errp); |
| qemu_iovec_destroy(&sub_qiov); |
| |
| return ret < 0 ? -EIO : 0; |
| } |
| |
| #define NBD_MAX_MALLOC_PAYLOAD 1000 |
| static coroutine_fn int nbd_co_receive_structured_payload( |
| BDRVNBDState *s, void **payload, Error **errp) |
| { |
| int ret; |
| uint32_t len; |
| |
| assert(nbd_reply_is_structured(&s->reply)); |
| |
| len = s->reply.structured.length; |
| |
| if (len == 0) { |
| return 0; |
| } |
| |
| if (payload == NULL) { |
| error_setg(errp, "Unexpected structured payload"); |
| return -EINVAL; |
| } |
| |
| if (len > NBD_MAX_MALLOC_PAYLOAD) { |
| error_setg(errp, "Payload too large"); |
| return -EINVAL; |
| } |
| |
| *payload = g_new(char, len); |
| ret = nbd_read(s->ioc, *payload, len, "structured payload", errp); |
| if (ret < 0) { |
| g_free(*payload); |
| *payload = NULL; |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * nbd_co_do_receive_one_chunk |
| * for simple reply: |
| * set request_ret to received reply error |
| * if qiov is not NULL: read payload to @qiov |
| * for structured reply chunk: |
| * if error chunk: read payload, set @request_ret, do not set @payload |
| * else if offset_data chunk: read payload data to @qiov, do not set @payload |
| * else: read payload to @payload |
| * |
| * If function fails, @errp contains corresponding error message, and the |
| * connection with the server is suspect. If it returns 0, then the |
| * transaction succeeded (although @request_ret may be a negative errno |
| * corresponding to the server's error reply), and errp is unchanged. |
| */ |
| static coroutine_fn int nbd_co_do_receive_one_chunk( |
| BDRVNBDState *s, uint64_t cookie, bool only_structured, |
| int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp) |
| { |
| int ret; |
| int i = COOKIE_TO_INDEX(cookie); |
| void *local_payload = NULL; |
| NBDStructuredReplyChunk *chunk; |
| |
| if (payload) { |
| *payload = NULL; |
| } |
| *request_ret = 0; |
| |
| ret = nbd_receive_replies(s, cookie); |
| if (ret < 0) { |
| error_setg(errp, "Connection closed"); |
| return -EIO; |
| } |
| assert(s->ioc); |
| |
| assert(s->reply.cookie == cookie); |
| |
| if (nbd_reply_is_simple(&s->reply)) { |
| if (only_structured) { |
| error_setg(errp, "Protocol error: simple reply when structured " |
| "reply chunk was expected"); |
| return -EINVAL; |
| } |
| |
| *request_ret = -nbd_errno_to_system_errno(s->reply.simple.error); |
| if (*request_ret < 0 || !qiov) { |
| return 0; |
| } |
| |
| return qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov, |
| errp) < 0 ? -EIO : 0; |
| } |
| |
| /* handle structured reply chunk */ |
| assert(s->info.structured_reply); |
| chunk = &s->reply.structured; |
| |
| if (chunk->type == NBD_REPLY_TYPE_NONE) { |
| if (!(chunk->flags & NBD_REPLY_FLAG_DONE)) { |
| error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk without" |
| " NBD_REPLY_FLAG_DONE flag set"); |
| return -EINVAL; |
| } |
| if (chunk->length) { |
| error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk with" |
| " nonzero length"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| if (chunk->type == NBD_REPLY_TYPE_OFFSET_DATA) { |
| if (!qiov) { |
| error_setg(errp, "Unexpected NBD_REPLY_TYPE_OFFSET_DATA chunk"); |
| return -EINVAL; |
| } |
| |
| return nbd_co_receive_offset_data_payload(s, s->requests[i].offset, |
| qiov, errp); |
| } |
| |
| if (nbd_reply_type_is_error(chunk->type)) { |
| payload = &local_payload; |
| } |
| |
| ret = nbd_co_receive_structured_payload(s, payload, errp); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| if (nbd_reply_type_is_error(chunk->type)) { |
| ret = nbd_parse_error_payload(chunk, local_payload, request_ret, errp); |
| g_free(local_payload); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * nbd_co_receive_one_chunk |
| * Read reply, wake up connection_co and set s->quit if needed. |
| * Return value is a fatal error code or normal nbd reply error code |
| */ |
| static coroutine_fn int nbd_co_receive_one_chunk( |
| BDRVNBDState *s, uint64_t cookie, bool only_structured, |
| int *request_ret, QEMUIOVector *qiov, NBDReply *reply, void **payload, |
| Error **errp) |
| { |
| int ret = nbd_co_do_receive_one_chunk(s, cookie, only_structured, |
| request_ret, qiov, payload, errp); |
| |
| if (ret < 0) { |
| memset(reply, 0, sizeof(*reply)); |
| nbd_channel_error(s, ret); |
| } else { |
| /* For assert at loop start in nbd_connection_entry */ |
| *reply = s->reply; |
| } |
| s->reply.cookie = 0; |
| |
| nbd_recv_coroutines_wake(s); |
| |
| return ret; |
| } |
| |
| typedef struct NBDReplyChunkIter { |
| int ret; |
| int request_ret; |
| Error *err; |
| bool done, only_structured; |
| } NBDReplyChunkIter; |
| |
| static void nbd_iter_channel_error(NBDReplyChunkIter *iter, |
| int ret, Error **local_err) |
| { |
| assert(local_err && *local_err); |
| assert(ret < 0); |
| |
| if (!iter->ret) { |
| iter->ret = ret; |
| error_propagate(&iter->err, *local_err); |
| } else { |
| error_free(*local_err); |
| } |
| |
| *local_err = NULL; |
| } |
| |
| static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret) |
| { |
| assert(ret < 0); |
| |
| if (!iter->request_ret) { |
| iter->request_ret = ret; |
| } |
| } |
| |
| /* |
| * NBD_FOREACH_REPLY_CHUNK |
| * The pointer stored in @payload requires g_free() to free it. |
| */ |
| #define NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, structured, \ |
| qiov, reply, payload) \ |
| for (iter = (NBDReplyChunkIter) { .only_structured = structured }; \ |
| nbd_reply_chunk_iter_receive(s, &iter, cookie, qiov, reply, payload);) |
| |
| /* |
| * nbd_reply_chunk_iter_receive |
| * The pointer stored in @payload requires g_free() to free it. |
| */ |
| static bool coroutine_fn nbd_reply_chunk_iter_receive(BDRVNBDState *s, |
| NBDReplyChunkIter *iter, |
| uint64_t cookie, |
| QEMUIOVector *qiov, |
| NBDReply *reply, |
| void **payload) |
| { |
| int ret, request_ret; |
| NBDReply local_reply; |
| NBDStructuredReplyChunk *chunk; |
| Error *local_err = NULL; |
| |
| if (iter->done) { |
| /* Previous iteration was last. */ |
| goto break_loop; |
| } |
| |
| if (reply == NULL) { |
| reply = &local_reply; |
| } |
| |
| ret = nbd_co_receive_one_chunk(s, cookie, iter->only_structured, |
| &request_ret, qiov, reply, payload, |
| &local_err); |
| if (ret < 0) { |
| nbd_iter_channel_error(iter, ret, &local_err); |
| } else if (request_ret < 0) { |
| nbd_iter_request_error(iter, request_ret); |
| } |
| |
| /* Do not execute the body of NBD_FOREACH_REPLY_CHUNK for simple reply. */ |
| if (nbd_reply_is_simple(reply) || iter->ret < 0) { |
| goto break_loop; |
| } |
| |
| chunk = &reply->structured; |
| iter->only_structured = true; |
| |
| if (chunk->type == NBD_REPLY_TYPE_NONE) { |
| /* NBD_REPLY_FLAG_DONE is already checked in nbd_co_receive_one_chunk */ |
| assert(chunk->flags & NBD_REPLY_FLAG_DONE); |
| goto break_loop; |
| } |
| |
| if (chunk->flags & NBD_REPLY_FLAG_DONE) { |
| /* This iteration is last. */ |
| iter->done = true; |
| } |
| |
| /* Execute the loop body */ |
| return true; |
| |
| break_loop: |
| qemu_mutex_lock(&s->requests_lock); |
| s->requests[COOKIE_TO_INDEX(cookie)].coroutine = NULL; |
| s->in_flight--; |
| qemu_co_queue_next(&s->free_sema); |
| qemu_mutex_unlock(&s->requests_lock); |
| |
| return false; |
| } |
| |
| static int coroutine_fn |
| nbd_co_receive_return_code(BDRVNBDState *s, uint64_t cookie, |
| int *request_ret, Error **errp) |
| { |
| NBDReplyChunkIter iter; |
| |
| NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, false, NULL, NULL, NULL) { |
| /* nbd_reply_chunk_iter_receive does all the work */ |
| } |
| |
| error_propagate(errp, iter.err); |
| *request_ret = iter.request_ret; |
| return iter.ret; |
| } |
| |
| static int coroutine_fn |
| nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t cookie, |
| uint64_t offset, QEMUIOVector *qiov, |
| int *request_ret, Error **errp) |
| { |
| NBDReplyChunkIter iter; |
| NBDReply reply; |
| void *payload = NULL; |
| Error *local_err = NULL; |
| |
| NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, s->info.structured_reply, |
| qiov, &reply, &payload) |
| { |
| int ret; |
| NBDStructuredReplyChunk *chunk = &reply.structured; |
| |
| assert(nbd_reply_is_structured(&reply)); |
| |
| switch (chunk->type) { |
| case NBD_REPLY_TYPE_OFFSET_DATA: |
| /* |
| * special cased in nbd_co_receive_one_chunk, data is already |
| * in qiov |
| */ |
| break; |
| case NBD_REPLY_TYPE_OFFSET_HOLE: |
| ret = nbd_parse_offset_hole_payload(s, &reply.structured, payload, |
| offset, qiov, &local_err); |
| if (ret < 0) { |
| nbd_channel_error(s, ret); |
| nbd_iter_channel_error(&iter, ret, &local_err); |
| } |
| break; |
| default: |
| if (!nbd_reply_type_is_error(chunk->type)) { |
| /* not allowed reply type */ |
| nbd_channel_error(s, -EINVAL); |
| error_setg(&local_err, |
| "Unexpected reply type: %d (%s) for CMD_READ", |
| chunk->type, nbd_reply_type_lookup(chunk->type)); |
| nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| } |
| } |
| |
| g_free(payload); |
| payload = NULL; |
| } |
| |
| error_propagate(errp, iter.err); |
| *request_ret = iter.request_ret; |
| return iter.ret; |
| } |
| |
| static int coroutine_fn |
| nbd_co_receive_blockstatus_reply(BDRVNBDState *s, uint64_t cookie, |
| uint64_t length, NBDExtent *extent, |
| int *request_ret, Error **errp) |
| { |
| NBDReplyChunkIter iter; |
| NBDReply reply; |
| void *payload = NULL; |
| Error *local_err = NULL; |
| bool received = false; |
| |
| assert(!extent->length); |
| NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, false, NULL, &reply, &payload) { |
| int ret; |
| NBDStructuredReplyChunk *chunk = &reply.structured; |
| |
| assert(nbd_reply_is_structured(&reply)); |
| |
| switch (chunk->type) { |
| case NBD_REPLY_TYPE_BLOCK_STATUS: |
| if (received) { |
| nbd_channel_error(s, -EINVAL); |
| error_setg(&local_err, "Several BLOCK_STATUS chunks in reply"); |
| nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| } |
| received = true; |
| |
| ret = nbd_parse_blockstatus_payload(s, &reply.structured, |
| payload, length, extent, |
| &local_err); |
| if (ret < 0) { |
| nbd_channel_error(s, ret); |
| nbd_iter_channel_error(&iter, ret, &local_err); |
| } |
| break; |
| default: |
| if (!nbd_reply_type_is_error(chunk->type)) { |
| nbd_channel_error(s, -EINVAL); |
| error_setg(&local_err, |
| "Unexpected reply type: %d (%s) " |
| "for CMD_BLOCK_STATUS", |
| chunk->type, nbd_reply_type_lookup(chunk->type)); |
| nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| } |
| } |
| |
| g_free(payload); |
| payload = NULL; |
| } |
| |
| if (!extent->length && !iter.request_ret) { |
| error_setg(&local_err, "Server did not reply with any status extents"); |
| nbd_iter_channel_error(&iter, -EIO, &local_err); |
| } |
| |
| error_propagate(errp, iter.err); |
| *request_ret = iter.request_ret; |
| return iter.ret; |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_co_request(BlockDriverState *bs, NBDRequest *request, |
| QEMUIOVector *write_qiov) |
| { |
| int ret, request_ret; |
| Error *local_err = NULL; |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| assert(request->type != NBD_CMD_READ); |
| if (write_qiov) { |
| assert(request->type == NBD_CMD_WRITE); |
| assert(request->len == iov_size(write_qiov->iov, write_qiov->niov)); |
| } else { |
| assert(request->type != NBD_CMD_WRITE); |
| } |
| |
| do { |
| ret = nbd_co_send_request(bs, request, write_qiov); |
| if (ret < 0) { |
| continue; |
| } |
| |
| ret = nbd_co_receive_return_code(s, request->cookie, |
| &request_ret, &local_err); |
| if (local_err) { |
| trace_nbd_co_request_fail(request->from, request->len, |
| request->cookie, request->flags, |
| request->type, |
| nbd_cmd_lookup(request->type), |
| ret, error_get_pretty(local_err)); |
| error_free(local_err); |
| local_err = NULL; |
| } |
| } while (ret < 0 && nbd_client_will_reconnect(s)); |
| |
| return ret ? ret : request_ret; |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_client_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| QEMUIOVector *qiov, BdrvRequestFlags flags) |
| { |
| int ret, request_ret; |
| Error *local_err = NULL; |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { |
| .type = NBD_CMD_READ, |
| .from = offset, |
| .len = bytes, |
| }; |
| |
| assert(bytes <= NBD_MAX_BUFFER_SIZE); |
| |
| if (!bytes) { |
| return 0; |
| } |
| /* |
| * Work around the fact that the block layer doesn't do |
| * byte-accurate sizing yet - if the read exceeds the server's |
| * advertised size because the block layer rounded size up, then |
| * truncate the request to the server and tail-pad with zero. |
| */ |
| if (offset >= s->info.size) { |
| assert(bytes < BDRV_SECTOR_SIZE); |
| qemu_iovec_memset(qiov, 0, 0, bytes); |
| return 0; |
| } |
| if (offset + bytes > s->info.size) { |
| uint64_t slop = offset + bytes - s->info.size; |
| |
| assert(slop < BDRV_SECTOR_SIZE); |
| qemu_iovec_memset(qiov, bytes - slop, 0, slop); |
| request.len -= slop; |
| } |
| |
| do { |
| ret = nbd_co_send_request(bs, &request, NULL); |
| if (ret < 0) { |
| continue; |
| } |
| |
| ret = nbd_co_receive_cmdread_reply(s, request.cookie, offset, qiov, |
| &request_ret, &local_err); |
| if (local_err) { |
| trace_nbd_co_request_fail(request.from, request.len, request.cookie, |
| request.flags, request.type, |
| nbd_cmd_lookup(request.type), |
| ret, error_get_pretty(local_err)); |
| error_free(local_err); |
| local_err = NULL; |
| } |
| } while (ret < 0 && nbd_client_will_reconnect(s)); |
| |
| return ret ? ret : request_ret; |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_client_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| QEMUIOVector *qiov, BdrvRequestFlags flags) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { |
| .type = NBD_CMD_WRITE, |
| .from = offset, |
| .len = bytes, |
| }; |
| |
| assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| if (flags & BDRV_REQ_FUA) { |
| assert(s->info.flags & NBD_FLAG_SEND_FUA); |
| request.flags |= NBD_CMD_FLAG_FUA; |
| } |
| |
| assert(bytes <= NBD_MAX_BUFFER_SIZE); |
| |
| if (!bytes) { |
| return 0; |
| } |
| return nbd_co_request(bs, &request, qiov); |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| BdrvRequestFlags flags) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { |
| .type = NBD_CMD_WRITE_ZEROES, |
| .from = offset, |
| .len = bytes, /* .len is uint32_t actually */ |
| }; |
| |
| assert(bytes <= UINT32_MAX); /* rely on max_pwrite_zeroes */ |
| |
| assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| if (!(s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { |
| return -ENOTSUP; |
| } |
| |
| if (flags & BDRV_REQ_FUA) { |
| assert(s->info.flags & NBD_FLAG_SEND_FUA); |
| request.flags |= NBD_CMD_FLAG_FUA; |
| } |
| if (!(flags & BDRV_REQ_MAY_UNMAP)) { |
| request.flags |= NBD_CMD_FLAG_NO_HOLE; |
| } |
| if (flags & BDRV_REQ_NO_FALLBACK) { |
| assert(s->info.flags & NBD_FLAG_SEND_FAST_ZERO); |
| request.flags |= NBD_CMD_FLAG_FAST_ZERO; |
| } |
| |
| if (!bytes) { |
| return 0; |
| } |
| return nbd_co_request(bs, &request, NULL); |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK nbd_client_co_flush(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { .type = NBD_CMD_FLUSH }; |
| |
| if (!(s->info.flags & NBD_FLAG_SEND_FLUSH)) { |
| return 0; |
| } |
| |
| request.from = 0; |
| request.len = 0; |
| |
| return nbd_co_request(bs, &request, NULL); |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK |
| nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { |
| .type = NBD_CMD_TRIM, |
| .from = offset, |
| .len = bytes, /* len is uint32_t */ |
| }; |
| |
| assert(bytes <= UINT32_MAX); /* rely on max_pdiscard */ |
| |
| assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| if (!(s->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) { |
| return 0; |
| } |
| |
| return nbd_co_request(bs, &request, NULL); |
| } |
| |
| static int coroutine_fn GRAPH_RDLOCK nbd_client_co_block_status( |
| BlockDriverState *bs, bool want_zero, int64_t offset, int64_t bytes, |
| int64_t *pnum, int64_t *map, BlockDriverState **file) |
| { |
| int ret, request_ret; |
| NBDExtent extent = { 0 }; |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| Error *local_err = NULL; |
| |
| NBDRequest request = { |
| .type = NBD_CMD_BLOCK_STATUS, |
| .from = offset, |
| .len = MIN(QEMU_ALIGN_DOWN(INT_MAX, bs->bl.request_alignment), |
| MIN(bytes, s->info.size - offset)), |
| .flags = NBD_CMD_FLAG_REQ_ONE, |
| }; |
| |
| if (!s->info.base_allocation) { |
| *pnum = bytes; |
| *map = offset; |
| *file = bs; |
| return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| } |
| |
| /* |
| * Work around the fact that the block layer doesn't do |
| * byte-accurate sizing yet - if the status request exceeds the |
| * server's advertised size because the block layer rounded size |
| * up, we truncated the request to the server (above), or are |
| * called on just the hole. |
| */ |
| if (offset >= s->info.size) { |
| *pnum = bytes; |
| assert(bytes < BDRV_SECTOR_SIZE); |
| /* Intentionally don't report offset_valid for the hole */ |
| return BDRV_BLOCK_ZERO; |
| } |
| |
| if (s->info.min_block) { |
| assert(QEMU_IS_ALIGNED(request.len, s->info.min_block)); |
| } |
| do { |
| ret = nbd_co_send_request(bs, &request, NULL); |
| if (ret < 0) { |
| continue; |
| } |
| |
| ret = nbd_co_receive_blockstatus_reply(s, request.cookie, bytes, |
| &extent, &request_ret, |
| &local_err); |
| if (local_err) { |
| trace_nbd_co_request_fail(request.from, request.len, request.cookie, |
| request.flags, request.type, |
| nbd_cmd_lookup(request.type), |
| ret, error_get_pretty(local_err)); |
| error_free(local_err); |
| local_err = NULL; |
| } |
| } while (ret < 0 && nbd_client_will_reconnect(s)); |
| |
| if (ret < 0 || request_ret < 0) { |
| return ret ? ret : request_ret; |
| } |
| |
| assert(extent.length); |
| *pnum = extent.length; |
| *map = offset; |
| *file = bs; |
| return (extent.flags & NBD_STATE_HOLE ? 0 : BDRV_BLOCK_DATA) | |
| (extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0) | |
| BDRV_BLOCK_OFFSET_VALID; |
| } |
| |
| static int nbd_client_reopen_prepare(BDRVReopenState *state, |
| BlockReopenQueue *queue, Error **errp) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)state->bs->opaque; |
| |
| if ((state->flags & BDRV_O_RDWR) && (s->info.flags & NBD_FLAG_READ_ONLY)) { |
| error_setg(errp, "Can't reopen read-only NBD mount as read/write"); |
| return -EACCES; |
| } |
| return 0; |
| } |
| |
| static void nbd_yank(void *opaque) |
| { |
| BlockDriverState *bs = opaque; |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| QEMU_LOCK_GUARD(&s->requests_lock); |
| qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| s->state = NBD_CLIENT_QUIT; |
| } |
| |
| static void nbd_client_close(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| NBDRequest request = { .type = NBD_CMD_DISC }; |
| |
| if (s->ioc) { |
| nbd_send_request(s->ioc, &request); |
| } |
| |
| nbd_teardown_connection(bs); |
| } |
| |
| |
| /* |
| * Parse nbd_open options |
| */ |
| |
| static int nbd_parse_uri(const char *filename, QDict *options) |
| { |
| URI *uri; |
| const char *p; |
| QueryParams *qp = NULL; |
| int ret = 0; |
| bool is_unix; |
| |
| uri = uri_parse(filename); |
| if (!uri) { |
| return -EINVAL; |
| } |
| |
| /* transport */ |
| if (!g_strcmp0(uri->scheme, "nbd")) { |
| is_unix = false; |
| } else if (!g_strcmp0(uri->scheme, "nbd+tcp")) { |
| is_unix = false; |
| } else if (!g_strcmp0(uri->scheme, "nbd+unix")) { |
| is_unix = true; |
| } else { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| p = uri->path ? uri->path : ""; |
| if (p[0] == '/') { |
| p++; |
| } |
| if (p[0]) { |
| qdict_put_str(options, "export", p); |
| } |
| |
| qp = query_params_parse(uri->query); |
| if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (is_unix) { |
| /* nbd+unix:///export?socket=path */ |
| if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { |
| ret = -EINVAL; |
| goto out; |
| } |
| qdict_put_str(options, "server.type", "unix"); |
| qdict_put_str(options, "server.path", qp->p[0].value); |
| } else { |
| QString *host; |
| char *port_str; |
| |
| /* nbd[+tcp]://host[:port]/export */ |
| if (!uri->server) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* strip braces from literal IPv6 address */ |
| if (uri->server[0] == '[') { |
| host = qstring_from_substr(uri->server, 1, |
| strlen(uri->server) - 1); |
| } else { |
| host = qstring_from_str(uri->server); |
| } |
| |
| qdict_put_str(options, "server.type", "inet"); |
| qdict_put(options, "server.host", host); |
| |
| port_str = g_strdup_printf("%d", uri->port ?: NBD_DEFAULT_PORT); |
| qdict_put_str(options, "server.port", port_str); |
| g_free(port_str); |
| } |
| |
| out: |
| if (qp) { |
| query_params_free(qp); |
| } |
| uri_free(uri); |
| return ret; |
| } |
| |
| static bool nbd_has_filename_options_conflict(QDict *options, Error **errp) |
| { |
| const QDictEntry *e; |
| |
| for (e = qdict_first(options); e; e = qdict_next(options, e)) { |
| if (!strcmp(e->key, "host") || |
| !strcmp(e->key, "port") || |
| !strcmp(e->key, "path") || |
| !strcmp(e->key, "export") || |
| strstart(e->key, "server.", NULL)) |
| { |
| error_setg(errp, "Option '%s' cannot be used with a file name", |
| e->key); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static void nbd_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| g_autofree char *file = NULL; |
| char *export_name; |
| const char *host_spec; |
| const char *unixpath; |
| |
| if (nbd_has_filename_options_conflict(options, errp)) { |
| return; |
| } |
| |
| if (strstr(filename, "://")) { |
| int ret = nbd_parse_uri(filename, options); |
| if (ret < 0) { |
| error_setg(errp, "No valid URL specified"); |
| } |
| return; |
| } |
| |
| file = g_strdup(filename); |
| |
| export_name = strstr(file, EN_OPTSTR); |
| if (export_name) { |
| if (export_name[strlen(EN_OPTSTR)] == 0) { |
| return; |
| } |
| export_name[0] = 0; /* truncate 'file' */ |
| export_name += strlen(EN_OPTSTR); |
| |
| qdict_put_str(options, "export", export_name); |
| } |
| |
| /* extract the host_spec - fail if it's not nbd:... */ |
| if (!strstart(file, "nbd:", &host_spec)) { |
| error_setg(errp, "File name string for NBD must start with 'nbd:'"); |
| return; |
| } |
| |
| if (!*host_spec) { |
| return; |
| } |
| |
| /* are we a UNIX or TCP socket? */ |
| if (strstart(host_spec, "unix:", &unixpath)) { |
| qdict_put_str(options, "server.type", "unix"); |
| qdict_put_str(options, "server.path", unixpath); |
| } else { |
| InetSocketAddress *addr = g_new(InetSocketAddress, 1); |
| |
| if (inet_parse(addr, host_spec, errp)) { |
| goto out_inet; |
| } |
| |
| qdict_put_str(options, "server.type", "inet"); |
| qdict_put_str(options, "server.host", addr->host); |
| qdict_put_str(options, "server.port", addr->port); |
| out_inet: |
| qapi_free_InetSocketAddress(addr); |
| } |
| } |
| |
| static bool nbd_process_legacy_socket_options(QDict *output_options, |
| QemuOpts *legacy_opts, |
| Error **errp) |
| { |
| const char *path = qemu_opt_get(legacy_opts, "path"); |
| const char *host = qemu_opt_get(legacy_opts, "host"); |
| const char *port = qemu_opt_get(legacy_opts, "port"); |
| const QDictEntry *e; |
| |
| if (!path && !host && !port) { |
| return true; |
| } |
| |
| for (e = qdict_first(output_options); e; e = qdict_next(output_options, e)) |
| { |
| if (strstart(e->key, "server.", NULL)) { |
| error_setg(errp, "Cannot use 'server' and path/host/port at the " |
| "same time"); |
| return false; |
| } |
| } |
| |
| if (path && host) { |
| error_setg(errp, "path and host may not be used at the same time"); |
| return false; |
| } else if (path) { |
| if (port) { |
| error_setg(errp, "port may not be used without host"); |
| return false; |
| } |
| |
| qdict_put_str(output_options, "server.type", "unix"); |
| qdict_put_str(output_options, "server.path", path); |
| } else if (host) { |
| qdict_put_str(output_options, "server.type", "inet"); |
| qdict_put_str(output_options, "server.host", host); |
| qdict_put_str(output_options, "server.port", |
| port ?: stringify(NBD_DEFAULT_PORT)); |
| } |
| |
| return true; |
| } |
| |
| static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options, |
| Error **errp) |
| { |
| SocketAddress *saddr = NULL; |
| QDict *addr = NULL; |
| Visitor *iv = NULL; |
| |
| qdict_extract_subqdict(options, &addr, "server."); |
| if (!qdict_size(addr)) { |
| error_setg(errp, "NBD server address missing"); |
| goto done; |
| } |
| |
| iv = qobject_input_visitor_new_flat_confused(addr, errp); |
| if (!iv) { |
| goto done; |
| } |
| |
| if (!visit_type_SocketAddress(iv, NULL, &saddr, errp)) { |
| goto done; |
| } |
| |
| if (socket_address_parse_named_fd(saddr, errp) < 0) { |
| qapi_free_SocketAddress(saddr); |
| saddr = NULL; |
| goto done; |
| } |
| |
| done: |
| qobject_unref(addr); |
| visit_free(iv); |
| return saddr; |
| } |
| |
| static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) |
| { |
| Object *obj; |
| QCryptoTLSCreds *creds; |
| |
| obj = object_resolve_path_component( |
| object_get_objects_root(), id); |
| if (!obj) { |
| error_setg(errp, "No TLS credentials with id '%s'", |
| id); |
| return NULL; |
| } |
| creds = (QCryptoTLSCreds *) |
| object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); |
| if (!creds) { |
| error_setg(errp, "Object with id '%s' is not TLS credentials", |
| id); |
| return NULL; |
| } |
| |
| if (!qcrypto_tls_creds_check_endpoint(creds, |
| QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, |
| errp)) { |
| return NULL; |
| } |
| object_ref(obj); |
| return creds; |
| } |
| |
| |
| static QemuOptsList nbd_runtime_opts = { |
| .name = "nbd", |
| .head = QTAILQ_HEAD_INITIALIZER(nbd_runtime_opts.head), |
| .desc = { |
| { |
| .name = "host", |
| .type = QEMU_OPT_STRING, |
| .help = "TCP host to connect to", |
| }, |
| { |
| .name = "port", |
| .type = QEMU_OPT_STRING, |
| .help = "TCP port to connect to", |
| }, |
| { |
| .name = "path", |
| .type = QEMU_OPT_STRING, |
| .help = "Unix socket path to connect to", |
| }, |
| { |
| .name = "export", |
| .type = QEMU_OPT_STRING, |
| .help = "Name of the NBD export to open", |
| }, |
| { |
| .name = "tls-creds", |
| .type = QEMU_OPT_STRING, |
| .help = "ID of the TLS credentials to use", |
| }, |
| { |
| .name = "tls-hostname", |
| .type = QEMU_OPT_STRING, |
| .help = "Override hostname for validating TLS x509 certificate", |
| }, |
| { |
| .name = "x-dirty-bitmap", |
| .type = QEMU_OPT_STRING, |
| .help = "experimental: expose named dirty bitmap in place of " |
| "block status", |
| }, |
| { |
| .name = "reconnect-delay", |
| .type = QEMU_OPT_NUMBER, |
| .help = "On an unexpected disconnect, the nbd client tries to " |
| "connect again until succeeding or encountering a serious " |
| "error. During the first @reconnect-delay seconds, all " |
| "requests are paused and will be rerun on a successful " |
| "reconnect. After that time, any delayed requests and all " |
| "future requests before a successful reconnect will " |
| "immediately fail. Default 0", |
| }, |
| { |
| .name = "open-timeout", |
| .type = QEMU_OPT_NUMBER, |
| .help = "In seconds. If zero, the nbd driver tries the connection " |
| "only once, and fails to open if the connection fails. " |
| "If non-zero, the nbd driver will repeat connection " |
| "attempts until successful or until @open-timeout seconds " |
| "have elapsed. Default 0", |
| }, |
| { /* end of list */ } |
| }, |
| }; |
| |
| static int nbd_process_options(BlockDriverState *bs, QDict *options, |
| Error **errp) |
| { |
| BDRVNBDState *s = bs->opaque; |
| QemuOpts *opts; |
| int ret = -EINVAL; |
| |
| opts = qemu_opts_create(&nbd_runtime_opts, NULL, 0, &error_abort); |
| if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| goto error; |
| } |
| |
| /* Translate @host, @port, and @path to a SocketAddress */ |
| if (!nbd_process_legacy_socket_options(options, opts, errp)) { |
| goto error; |
| } |
| |
| /* Pop the config into our state object. Exit if invalid. */ |
| s->saddr = nbd_config(s, options, errp); |
| if (!s->saddr) { |
| goto error; |
| } |
| |
| s->export = g_strdup(qemu_opt_get(opts, "export")); |
| if (s->export && strlen(s->export) > NBD_MAX_STRING_SIZE) { |
| error_setg(errp, "export name too long to send to server"); |
| goto error; |
| } |
| |
| s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds")); |
| if (s->tlscredsid) { |
| s->tlscreds = nbd_get_tls_creds(s->tlscredsid, errp); |
| if (!s->tlscreds) { |
| goto error; |
| } |
| |
| s->tlshostname = g_strdup(qemu_opt_get(opts, "tls-hostname")); |
| if (!s->tlshostname && |
| s->saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
| s->tlshostname = g_strdup(s->saddr->u.inet.host); |
| } |
| } |
| |
| s->x_dirty_bitmap = g_strdup(qemu_opt_get(opts, "x-dirty-bitmap")); |
| if (s->x_dirty_bitmap && strlen(s->x_dirty_bitmap) > NBD_MAX_STRING_SIZE) { |
| error_setg(errp, "x-dirty-bitmap query too long to send to server"); |
| goto error; |
| } |
| |
| s->reconnect_delay = qemu_opt_get_number(opts, "reconnect-delay", 0); |
| s->open_timeout = qemu_opt_get_number(opts, "open-timeout", 0); |
| |
| ret = 0; |
| |
| error: |
| qemu_opts_del(opts); |
| return ret; |
| } |
| |
| static int nbd_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| int ret; |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| s->bs = bs; |
| qemu_mutex_init(&s->requests_lock); |
| qemu_co_queue_init(&s->free_sema); |
| qemu_co_mutex_init(&s->send_mutex); |
| qemu_co_mutex_init(&s->receive_mutex); |
| |
| if (!yank_register_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name), errp)) { |
| return -EEXIST; |
| } |
| |
| ret = nbd_process_options(bs, options, errp); |
| if (ret < 0) { |
| goto fail; |
| } |
| |
| s->conn = nbd_client_connection_new(s->saddr, true, s->export, |
| s->x_dirty_bitmap, s->tlscreds, |
| s->tlshostname); |
| |
| if (s->open_timeout) { |
| nbd_client_connection_enable_retry(s->conn); |
| open_timer_init(s, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + |
| s->open_timeout * NANOSECONDS_PER_SECOND); |
| } |
| |
| s->state = NBD_CLIENT_CONNECTING_WAIT; |
| ret = nbd_do_establish_connection(bs, true, errp); |
| if (ret < 0) { |
| goto fail; |
| } |
| |
| /* |
| * The connect attempt is done, so we no longer need this timer. |
| * Delete it, because we do not want it to be around when this node |
| * is drained or closed. |
| */ |
| open_timer_del(s); |
| |
| nbd_client_connection_enable_retry(s->conn); |
| |
| return 0; |
| |
| fail: |
| open_timer_del(s); |
| nbd_clear_bdrvstate(bs); |
| return ret; |
| } |
| |
| static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| uint32_t min = s->info.min_block; |
| uint32_t max = MIN_NON_ZERO(NBD_MAX_BUFFER_SIZE, s->info.max_block); |
| |
| /* |
| * If the server did not advertise an alignment: |
| * - a size that is not sector-aligned implies that an alignment |
| * of 1 can be used to access those tail bytes |
| * - advertisement of block status requires an alignment of 1, so |
| * that we don't violate block layer constraints that block |
| * status is always aligned (as we can't control whether the |
| * server will report sub-sector extents, such as a hole at EOF |
| * on an unaligned POSIX file) |
| * - otherwise, assume the server is so old that we are safer avoiding |
| * sub-sector requests |
| */ |
| if (!min) { |
| min = (!QEMU_IS_ALIGNED(s->info.size, BDRV_SECTOR_SIZE) || |
| s->info.base_allocation) ? 1 : BDRV_SECTOR_SIZE; |
| } |
| |
| bs->bl.request_alignment = min; |
| bs->bl.max_pdiscard = QEMU_ALIGN_DOWN(INT_MAX, min); |
| bs->bl.max_pwrite_zeroes = max; |
| bs->bl.max_transfer = max; |
| |
| if (s->info.opt_block && |
| s->info.opt_block > bs->bl.opt_transfer) { |
| bs->bl.opt_transfer = s->info.opt_block; |
| } |
| } |
| |
| static void nbd_close(BlockDriverState *bs) |
| { |
| nbd_client_close(bs); |
| nbd_clear_bdrvstate(bs); |
| } |
| |
| /* |
| * NBD cannot truncate, but if the caller asks to truncate to the same size, or |
| * to a smaller size with exact=false, there is no reason to fail the |
| * operation. |
| * |
| * Preallocation mode is ignored since it does not seems useful to fail when |
| * we never change anything. |
| */ |
| static int coroutine_fn nbd_co_truncate(BlockDriverState *bs, int64_t offset, |
| bool exact, PreallocMode prealloc, |
| BdrvRequestFlags flags, Error **errp) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| if (offset != s->info.size && exact) { |
| error_setg(errp, "Cannot resize NBD nodes"); |
| return -ENOTSUP; |
| } |
| |
| if (offset > s->info.size) { |
| error_setg(errp, "Cannot grow NBD nodes"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int64_t coroutine_fn nbd_co_getlength(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| return s->info.size; |
| } |
| |
| static void nbd_refresh_filename(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| const char *host = NULL, *port = NULL, *path = NULL; |
| size_t len = 0; |
| |
| if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
| const InetSocketAddress *inet = &s->saddr->u.inet; |
| if (!inet->has_ipv4 && !inet->has_ipv6 && !inet->has_to) { |
| host = inet->host; |
| port = inet->port; |
| } |
| } else if (s->saddr->type == SOCKET_ADDRESS_TYPE_UNIX) { |
| path = s->saddr->u.q_unix.path; |
| } /* else can't represent as pseudo-filename */ |
| |
| if (path && s->export) { |
| len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd+unix:///%s?socket=%s", s->export, path); |
| } else if (path && !s->export) { |
| len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd+unix://?socket=%s", path); |
| } else if (host && s->export) { |
| len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd://%s:%s/%s", host, port, s->export); |
| } else if (host && !s->export) { |
| len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd://%s:%s", host, port); |
| } |
| if (len >= sizeof(bs->exact_filename)) { |
| /* Name is too long to represent exactly, so leave it empty. */ |
| bs->exact_filename[0] = '\0'; |
| } |
| } |
| |
| static char *nbd_dirname(BlockDriverState *bs, Error **errp) |
| { |
| /* The generic bdrv_dirname() implementation is able to work out some |
| * directory name for NBD nodes, but that would be wrong. So far there is no |
| * specification for how "export paths" would work, so NBD does not have |
| * directory names. */ |
| error_setg(errp, "Cannot generate a base directory for NBD nodes"); |
| return NULL; |
| } |
| |
| static const char *const nbd_strong_runtime_opts[] = { |
| "path", |
| "host", |
| "port", |
| "export", |
| "tls-creds", |
| "tls-hostname", |
| "server.", |
| |
| NULL |
| }; |
| |
| static void nbd_cancel_in_flight(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| |
| reconnect_delay_timer_del(s); |
| |
| qemu_mutex_lock(&s->requests_lock); |
| if (s->state == NBD_CLIENT_CONNECTING_WAIT) { |
| s->state = NBD_CLIENT_CONNECTING_NOWAIT; |
| } |
| qemu_mutex_unlock(&s->requests_lock); |
| |
| nbd_co_establish_connection_cancel(s->conn); |
| } |
| |
| static void nbd_attach_aio_context(BlockDriverState *bs, |
| AioContext *new_context) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| /* The open_timer is used only during nbd_open() */ |
| assert(!s->open_timer); |
| |
| /* |
| * The reconnect_delay_timer is scheduled in I/O paths when the |
| * connection is lost, to cancel the reconnection attempt after a |
| * given time. Once this attempt is done (successfully or not), |
| * nbd_reconnect_attempt() ensures the timer is deleted before the |
| * respective I/O request is resumed. |
| * Since the AioContext can only be changed when a node is drained, |
| * the reconnect_delay_timer cannot be active here. |
| */ |
| assert(!s->reconnect_delay_timer); |
| |
| if (s->ioc) { |
| qio_channel_attach_aio_context(s->ioc, new_context); |
| } |
| } |
| |
| static void nbd_detach_aio_context(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| assert(!s->open_timer); |
| assert(!s->reconnect_delay_timer); |
| |
| if (s->ioc) { |
| qio_channel_detach_aio_context(s->ioc); |
| } |
| } |
| |
| static BlockDriver bdrv_nbd = { |
| .format_name = "nbd", |
| .protocol_name = "nbd", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .bdrv_file_open = nbd_open, |
| .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_client_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_co_truncate = nbd_co_truncate, |
| .bdrv_co_getlength = nbd_co_getlength, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| .bdrv_co_block_status = nbd_client_co_block_status, |
| .bdrv_dirname = nbd_dirname, |
| .strong_runtime_opts = nbd_strong_runtime_opts, |
| .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| }; |
| |
| static BlockDriver bdrv_nbd_tcp = { |
| .format_name = "nbd", |
| .protocol_name = "nbd+tcp", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .bdrv_file_open = nbd_open, |
| .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_client_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_co_truncate = nbd_co_truncate, |
| .bdrv_co_getlength = nbd_co_getlength, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| .bdrv_co_block_status = nbd_client_co_block_status, |
| .bdrv_dirname = nbd_dirname, |
| .strong_runtime_opts = nbd_strong_runtime_opts, |
| .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| }; |
| |
| static BlockDriver bdrv_nbd_unix = { |
| .format_name = "nbd", |
| .protocol_name = "nbd+unix", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| .create_opts = &bdrv_create_opts_simple, |
| .bdrv_file_open = nbd_open, |
| .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_client_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_co_truncate = nbd_co_truncate, |
| .bdrv_co_getlength = nbd_co_getlength, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| .bdrv_co_block_status = nbd_client_co_block_status, |
| .bdrv_dirname = nbd_dirname, |
| .strong_runtime_opts = nbd_strong_runtime_opts, |
| .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| }; |
| |
| static void bdrv_nbd_init(void) |
| { |
| bdrv_register(&bdrv_nbd); |
| bdrv_register(&bdrv_nbd_tcp); |
| bdrv_register(&bdrv_nbd_unix); |
| } |
| |
| block_init(bdrv_nbd_init); |