| 1 | /* |
| 2 | * QEMU Block driver for NBD |
| 3 | * |
| 4 | * Copyright (c) 2019 Virtuozzo International GmbH. |
| 5 | * Copyright Red Hat |
| 6 | * Copyright (C) 2008 Bull S.A.S. |
| 7 | * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
| 8 | * |
| 9 | * Some parts: |
| 10 | * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> |
| 11 | * |
| 12 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 13 | * of this software and associated documentation files (the "Software"), to deal |
| 14 | * in the Software without restriction, including without limitation the rights |
| 15 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 16 | * copies of the Software, and to permit persons to whom the Software is |
| 17 | * furnished to do so, subject to the following conditions: |
| 18 | * |
| 19 | * The above copyright notice and this permission notice shall be included in |
| 20 | * all copies or substantial portions of the Software. |
| 21 | * |
| 22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 25 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 26 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 27 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 28 | * THE SOFTWARE. |
| 29 | */ |
| 30 | |
| 31 | #include "qemu/osdep.h" |
| 32 | |
| 33 | #include "trace.h" |
| 34 | #include "qemu/option.h" |
| 35 | #include "qemu/cutils.h" |
| 36 | #include "qemu/main-loop.h" |
| 37 | |
| 38 | #include "qapi/qapi-visit-sockets.h" |
| 39 | #include "qobject/qstring.h" |
| 40 | #include "qapi/clone-visitor.h" |
| 41 | |
| 42 | #include "block/qdict.h" |
| 43 | #include "block/nbd.h" |
| 44 | #include "block/block_int.h" |
| 45 | #include "block/coroutines.h" |
| 46 | |
| 47 | #include "qemu/yank.h" |
| 48 | |
| 49 | #define EN_OPTSTR ":exportname=" |
| 50 | #define MAX_NBD_REQUESTS 16 |
| 51 | |
| 52 | #define COOKIE_TO_INDEX(cookie) ((cookie) - 1) |
| 53 | #define INDEX_TO_COOKIE(index) ((index) + 1) |
| 54 | |
| 55 | typedef struct { |
| 56 | Coroutine *coroutine; |
| 57 | uint64_t offset; /* original offset of the request */ |
| 58 | bool receiving; /* sleeping in the yield in nbd_receive_replies */ |
| 59 | } NBDClientRequest; |
| 60 | |
| 61 | typedef enum NBDClientState { |
| 62 | NBD_CLIENT_CONNECTING_WAIT, |
| 63 | NBD_CLIENT_CONNECTING_NOWAIT, |
| 64 | NBD_CLIENT_CONNECTED, |
| 65 | NBD_CLIENT_QUIT |
| 66 | } NBDClientState; |
| 67 | |
| 68 | typedef struct BDRVNBDState { |
| 69 | QIOChannel *ioc; /* The current I/O channel */ |
| 70 | NBDExportInfo info; |
| 71 | |
| 72 | /* |
| 73 | * Protects state, free_sema, in_flight, requests[].coroutine, |
| 74 | * reconnect_delay_timer. |
| 75 | */ |
| 76 | QemuMutex requests_lock; |
| 77 | NBDClientState state; |
| 78 | CoQueue free_sema; |
| 79 | unsigned in_flight; |
| 80 | NBDClientRequest requests[MAX_NBD_REQUESTS]; |
| 81 | QEMUTimer *reconnect_delay_timer; |
| 82 | |
| 83 | /* Protects sending data on the socket. */ |
| 84 | CoMutex send_mutex; |
| 85 | |
| 86 | /* |
| 87 | * Protects receiving reply headers from the socket, as well as the |
| 88 | * fields reply and requests[].receiving |
| 89 | */ |
| 90 | CoMutex receive_mutex; |
| 91 | NBDReply reply; |
| 92 | |
| 93 | QEMUTimer *open_timer; |
| 94 | |
| 95 | BlockDriverState *bs; |
| 96 | |
| 97 | /* Connection parameters */ |
| 98 | uint32_t reconnect_delay; |
| 99 | uint32_t open_timeout; |
| 100 | SocketAddress *saddr; |
| 101 | char *export; |
| 102 | char *tlscredsid; |
| 103 | QCryptoTLSCreds *tlscreds; |
| 104 | char *tlshostname; |
| 105 | char *x_dirty_bitmap; |
| 106 | bool alloc_depth; |
| 107 | |
| 108 | NBDClientConnection *conn; |
| 109 | } BDRVNBDState; |
| 110 | |
| 111 | static void nbd_yank(void *opaque); |
| 112 | |
| 113 | static void nbd_clear_bdrvstate(BlockDriverState *bs) |
| 114 | { |
| 115 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 116 | |
| 117 | nbd_client_connection_release(s->conn); |
| 118 | s->conn = NULL; |
| 119 | |
| 120 | yank_unregister_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name)); |
| 121 | |
| 122 | /* Must not leave timers behind that would access freed data */ |
| 123 | assert(!s->reconnect_delay_timer); |
| 124 | assert(!s->open_timer); |
| 125 | |
| 126 | object_unref(OBJECT(s->tlscreds)); |
| 127 | qapi_free_SocketAddress(s->saddr); |
| 128 | s->saddr = NULL; |
| 129 | g_free(s->export); |
| 130 | s->export = NULL; |
| 131 | g_free(s->tlscredsid); |
| 132 | s->tlscredsid = NULL; |
| 133 | g_free(s->tlshostname); |
| 134 | s->tlshostname = NULL; |
| 135 | g_free(s->x_dirty_bitmap); |
| 136 | s->x_dirty_bitmap = NULL; |
| 137 | } |
| 138 | |
| 139 | /* Called with s->receive_mutex taken. */ |
| 140 | static bool coroutine_fn nbd_recv_coroutine_wake_one(NBDClientRequest *req) |
| 141 | { |
| 142 | if (req->receiving) { |
| 143 | req->receiving = false; |
| 144 | aio_co_wake(req->coroutine); |
| 145 | return true; |
| 146 | } |
| 147 | |
| 148 | return false; |
| 149 | } |
| 150 | |
| 151 | static void coroutine_fn nbd_recv_coroutines_wake(BDRVNBDState *s) |
| 152 | { |
| 153 | int i; |
| 154 | |
| 155 | QEMU_LOCK_GUARD(&s->receive_mutex); |
| 156 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
| 157 | if (nbd_recv_coroutine_wake_one(&s->requests[i])) { |
| 158 | return; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /* Called with s->requests_lock held. */ |
| 164 | static void coroutine_fn nbd_channel_error_locked(BDRVNBDState *s, int ret) |
| 165 | { |
| 166 | if (s->state == NBD_CLIENT_CONNECTED) { |
| 167 | qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| 168 | } |
| 169 | |
| 170 | if (ret == -EIO) { |
| 171 | if (s->state == NBD_CLIENT_CONNECTED) { |
| 172 | s->state = s->reconnect_delay ? NBD_CLIENT_CONNECTING_WAIT : |
| 173 | NBD_CLIENT_CONNECTING_NOWAIT; |
| 174 | } |
| 175 | } else { |
| 176 | s->state = NBD_CLIENT_QUIT; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | static void coroutine_fn nbd_channel_error(BDRVNBDState *s, int ret) |
| 181 | { |
| 182 | QEMU_LOCK_GUARD(&s->requests_lock); |
| 183 | nbd_channel_error_locked(s, ret); |
| 184 | } |
| 185 | |
| 186 | static void reconnect_delay_timer_del(BDRVNBDState *s) |
| 187 | { |
| 188 | if (s->reconnect_delay_timer) { |
| 189 | timer_free(s->reconnect_delay_timer); |
| 190 | s->reconnect_delay_timer = NULL; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | static void reconnect_delay_timer_cb(void *opaque) |
| 195 | { |
| 196 | BDRVNBDState *s = opaque; |
| 197 | |
| 198 | reconnect_delay_timer_del(s); |
| 199 | WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| 200 | if (s->state != NBD_CLIENT_CONNECTING_WAIT) { |
| 201 | return; |
| 202 | } |
| 203 | s->state = NBD_CLIENT_CONNECTING_NOWAIT; |
| 204 | } |
| 205 | nbd_co_establish_connection_cancel(s->conn); |
| 206 | } |
| 207 | |
| 208 | static void reconnect_delay_timer_init(BDRVNBDState *s, uint64_t expire_time_ns) |
| 209 | { |
| 210 | assert(!s->reconnect_delay_timer); |
| 211 | s->reconnect_delay_timer = aio_timer_new(bdrv_get_aio_context(s->bs), |
| 212 | QEMU_CLOCK_REALTIME, |
| 213 | SCALE_NS, |
| 214 | reconnect_delay_timer_cb, s); |
| 215 | timer_mod(s->reconnect_delay_timer, expire_time_ns); |
| 216 | } |
| 217 | |
| 218 | static void nbd_teardown_connection(BlockDriverState *bs) |
| 219 | { |
| 220 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 221 | |
| 222 | assert(!s->in_flight); |
| 223 | |
| 224 | if (s->ioc) { |
| 225 | qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| 226 | yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| 227 | nbd_yank, s->bs); |
| 228 | object_unref(OBJECT(s->ioc)); |
| 229 | s->ioc = NULL; |
| 230 | } |
| 231 | |
| 232 | WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| 233 | s->state = NBD_CLIENT_QUIT; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | static void open_timer_del(BDRVNBDState *s) |
| 238 | { |
| 239 | if (s->open_timer) { |
| 240 | timer_free(s->open_timer); |
| 241 | s->open_timer = NULL; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static void open_timer_cb(void *opaque) |
| 246 | { |
| 247 | BDRVNBDState *s = opaque; |
| 248 | |
| 249 | nbd_co_establish_connection_cancel(s->conn); |
| 250 | open_timer_del(s); |
| 251 | } |
| 252 | |
| 253 | static void open_timer_init(BDRVNBDState *s, uint64_t expire_time_ns) |
| 254 | { |
| 255 | assert(!s->open_timer); |
| 256 | s->open_timer = aio_timer_new(bdrv_get_aio_context(s->bs), |
| 257 | QEMU_CLOCK_REALTIME, |
| 258 | SCALE_NS, |
| 259 | open_timer_cb, s); |
| 260 | timer_mod(s->open_timer, expire_time_ns); |
| 261 | } |
| 262 | |
| 263 | static bool nbd_client_will_reconnect(BDRVNBDState *s) |
| 264 | { |
| 265 | /* |
| 266 | * Called only after a socket error, so this is not performance sensitive. |
| 267 | */ |
| 268 | QEMU_LOCK_GUARD(&s->requests_lock); |
| 269 | return s->state == NBD_CLIENT_CONNECTING_WAIT; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Update @bs with information learned during a completed negotiation process. |
| 274 | * Return failure if the server's advertised options are incompatible with the |
| 275 | * client's needs. |
| 276 | */ |
| 277 | static int coroutine_fn GRAPH_RDLOCK |
| 278 | nbd_handle_updated_info(BlockDriverState *bs, Error **errp) |
| 279 | { |
| 280 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 281 | int ret; |
| 282 | |
| 283 | if (s->x_dirty_bitmap) { |
| 284 | if (!s->info.base_allocation) { |
| 285 | error_setg(errp, "requested x-dirty-bitmap %s not found", |
| 286 | s->x_dirty_bitmap); |
| 287 | return -EINVAL; |
| 288 | } |
| 289 | if (strcmp(s->x_dirty_bitmap, "qemu:allocation-depth") == 0) { |
| 290 | s->alloc_depth = true; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | if (s->info.flags & NBD_FLAG_READ_ONLY) { |
| 295 | ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only", errp); |
| 296 | if (ret < 0) { |
| 297 | return ret; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | if (s->info.flags & NBD_FLAG_SEND_FUA) { |
| 302 | bs->supported_write_flags = BDRV_REQ_FUA; |
| 303 | bs->supported_zero_flags |= BDRV_REQ_FUA; |
| 304 | } |
| 305 | |
| 306 | if (s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES) { |
| 307 | bs->supported_zero_flags |= BDRV_REQ_MAY_UNMAP; |
| 308 | if (s->info.flags & NBD_FLAG_SEND_FAST_ZERO) { |
| 309 | bs->supported_zero_flags |= BDRV_REQ_NO_FALLBACK; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | trace_nbd_client_handshake_success(s->export); |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | int coroutine_fn nbd_co_do_establish_connection(BlockDriverState *bs, |
| 319 | bool blocking, Error **errp) |
| 320 | { |
| 321 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 322 | int ret; |
| 323 | IO_CODE(); |
| 324 | |
| 325 | assert_bdrv_graph_readable(); |
| 326 | assert(!s->ioc); |
| 327 | |
| 328 | s->ioc = nbd_co_establish_connection(s->conn, &s->info, blocking, errp); |
| 329 | if (!s->ioc) { |
| 330 | return -ECONNREFUSED; |
| 331 | } |
| 332 | |
| 333 | yank_register_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), nbd_yank, |
| 334 | bs); |
| 335 | |
| 336 | ret = nbd_handle_updated_info(s->bs, NULL); |
| 337 | if (ret < 0) { |
| 338 | /* |
| 339 | * We have connected, but must fail for other reasons. |
| 340 | * Send NBD_CMD_DISC as a courtesy to the server. |
| 341 | */ |
| 342 | NBDRequest request = { .type = NBD_CMD_DISC, .mode = s->info.mode }; |
| 343 | |
| 344 | nbd_send_request(s->ioc, &request); |
| 345 | |
| 346 | yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| 347 | nbd_yank, bs); |
| 348 | object_unref(OBJECT(s->ioc)); |
| 349 | s->ioc = NULL; |
| 350 | |
| 351 | return ret; |
| 352 | } |
| 353 | |
| 354 | if (!qio_channel_set_blocking(s->ioc, false, errp)) { |
| 355 | return -EINVAL; |
| 356 | } |
| 357 | qio_channel_set_follow_coroutine_ctx(s->ioc, true); |
| 358 | |
| 359 | /* successfully connected */ |
| 360 | WITH_QEMU_LOCK_GUARD(&s->requests_lock) { |
| 361 | s->state = NBD_CLIENT_CONNECTED; |
| 362 | } |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /* Called with s->requests_lock held. */ |
| 368 | static bool nbd_client_connecting(BDRVNBDState *s) |
| 369 | { |
| 370 | return s->state == NBD_CLIENT_CONNECTING_WAIT || |
| 371 | s->state == NBD_CLIENT_CONNECTING_NOWAIT; |
| 372 | } |
| 373 | |
| 374 | /* Called with s->requests_lock taken. */ |
| 375 | static void coroutine_fn GRAPH_RDLOCK nbd_reconnect_attempt(BDRVNBDState *s) |
| 376 | { |
| 377 | int ret; |
| 378 | bool blocking = s->state == NBD_CLIENT_CONNECTING_WAIT; |
| 379 | |
| 380 | /* |
| 381 | * Now we are sure that nobody is accessing the channel, and no one will |
| 382 | * try until we set the state to CONNECTED. |
| 383 | */ |
| 384 | assert(nbd_client_connecting(s)); |
| 385 | assert(s->in_flight == 1); |
| 386 | |
| 387 | trace_nbd_reconnect_attempt(s->bs->in_flight); |
| 388 | |
| 389 | if (blocking && !s->reconnect_delay_timer) { |
| 390 | /* |
| 391 | * It's the first reconnect attempt after switching to |
| 392 | * NBD_CLIENT_CONNECTING_WAIT |
| 393 | */ |
| 394 | g_assert(s->reconnect_delay); |
| 395 | reconnect_delay_timer_init(s, |
| 396 | qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + |
| 397 | s->reconnect_delay * NANOSECONDS_PER_SECOND); |
| 398 | } |
| 399 | |
| 400 | /* Finalize previous connection if any */ |
| 401 | if (s->ioc) { |
| 402 | yank_unregister_function(BLOCKDEV_YANK_INSTANCE(s->bs->node_name), |
| 403 | nbd_yank, s->bs); |
| 404 | object_unref(OBJECT(s->ioc)); |
| 405 | s->ioc = NULL; |
| 406 | } |
| 407 | |
| 408 | qemu_mutex_unlock(&s->requests_lock); |
| 409 | ret = nbd_co_do_establish_connection(s->bs, blocking, NULL); |
| 410 | trace_nbd_reconnect_attempt_result(ret, s->bs->in_flight); |
| 411 | qemu_mutex_lock(&s->requests_lock); |
| 412 | |
| 413 | /* |
| 414 | * The reconnect attempt is done (maybe successfully, maybe not), so |
| 415 | * we no longer need this timer. Delete it so it will not outlive |
| 416 | * this I/O request (so draining removes all timers). |
| 417 | */ |
| 418 | reconnect_delay_timer_del(s); |
| 419 | } |
| 420 | |
| 421 | static coroutine_fn int nbd_receive_replies(BDRVNBDState *s, uint64_t cookie, |
| 422 | Error **errp) |
| 423 | { |
| 424 | int ret; |
| 425 | uint64_t ind = COOKIE_TO_INDEX(cookie), ind2; |
| 426 | QEMU_LOCK_GUARD(&s->receive_mutex); |
| 427 | |
| 428 | while (true) { |
| 429 | if (s->reply.cookie == cookie) { |
| 430 | /* We are done */ |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | if (s->reply.cookie != 0) { |
| 435 | /* |
| 436 | * Some other request is being handled now. It should already be |
| 437 | * woken by whoever set s->reply.cookie (or never wait in this |
| 438 | * yield). So, we should not wake it here. |
| 439 | */ |
| 440 | ind2 = COOKIE_TO_INDEX(s->reply.cookie); |
| 441 | assert(!s->requests[ind2].receiving); |
| 442 | |
| 443 | s->requests[ind].receiving = true; |
| 444 | qemu_co_mutex_unlock(&s->receive_mutex); |
| 445 | |
| 446 | qemu_coroutine_yield(); |
| 447 | /* |
| 448 | * We may be woken for 2 reasons: |
| 449 | * 1. From this function, executing in parallel coroutine, when our |
| 450 | * cookie is received. |
| 451 | * 2. From nbd_co_receive_one_chunk(), when previous request is |
| 452 | * finished and s->reply.cookie set to 0. |
| 453 | * Anyway, it's OK to lock the mutex and go to the next iteration. |
| 454 | */ |
| 455 | |
| 456 | qemu_co_mutex_lock(&s->receive_mutex); |
| 457 | assert(!s->requests[ind].receiving); |
| 458 | continue; |
| 459 | } |
| 460 | |
| 461 | /* We are under mutex and cookie is 0. We have to do the dirty work. */ |
| 462 | assert(s->reply.cookie == 0); |
| 463 | ret = nbd_receive_reply(s->bs, s->ioc, &s->reply, s->info.mode, errp); |
| 464 | if (ret == 0) { |
| 465 | ret = -EIO; |
| 466 | error_setg(errp, "server dropped connection"); |
| 467 | } |
| 468 | if (ret < 0) { |
| 469 | nbd_channel_error(s, ret); |
| 470 | return ret; |
| 471 | } |
| 472 | if (nbd_reply_is_structured(&s->reply) && |
| 473 | s->info.mode < NBD_MODE_STRUCTURED) { |
| 474 | nbd_channel_error(s, -EINVAL); |
| 475 | error_setg(errp, "unexpected structured reply"); |
| 476 | return -EINVAL; |
| 477 | } |
| 478 | ind2 = COOKIE_TO_INDEX(s->reply.cookie); |
| 479 | if (ind2 >= MAX_NBD_REQUESTS || !s->requests[ind2].coroutine) { |
| 480 | nbd_channel_error(s, -EINVAL); |
| 481 | error_setg(errp, "unexpected cookie value"); |
| 482 | return -EINVAL; |
| 483 | } |
| 484 | if (s->reply.cookie == cookie) { |
| 485 | /* We are done */ |
| 486 | return 0; |
| 487 | } |
| 488 | nbd_recv_coroutine_wake_one(&s->requests[ind2]); |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | static int coroutine_fn GRAPH_RDLOCK |
| 493 | nbd_co_send_request(BlockDriverState *bs, NBDRequest *request, |
| 494 | QEMUIOVector *qiov) |
| 495 | { |
| 496 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 497 | int rc, i = -1; |
| 498 | |
| 499 | qemu_mutex_lock(&s->requests_lock); |
| 500 | while (s->in_flight == MAX_NBD_REQUESTS || |
| 501 | (s->state != NBD_CLIENT_CONNECTED && s->in_flight > 0)) { |
| 502 | qemu_co_queue_wait(&s->free_sema, &s->requests_lock); |
| 503 | } |
| 504 | |
| 505 | s->in_flight++; |
| 506 | if (s->state != NBD_CLIENT_CONNECTED) { |
| 507 | if (nbd_client_connecting(s)) { |
| 508 | nbd_reconnect_attempt(s); |
| 509 | qemu_co_queue_restart_all(&s->free_sema); |
| 510 | } |
| 511 | if (s->state != NBD_CLIENT_CONNECTED) { |
| 512 | rc = -EIO; |
| 513 | goto err; |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | for (i = 0; i < MAX_NBD_REQUESTS; i++) { |
| 518 | if (s->requests[i].coroutine == NULL) { |
| 519 | break; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | assert(i < MAX_NBD_REQUESTS); |
| 524 | s->requests[i].coroutine = qemu_coroutine_self(); |
| 525 | s->requests[i].offset = request->from; |
| 526 | s->requests[i].receiving = false; |
| 527 | qemu_mutex_unlock(&s->requests_lock); |
| 528 | |
| 529 | qemu_co_mutex_lock(&s->send_mutex); |
| 530 | request->cookie = INDEX_TO_COOKIE(i); |
| 531 | request->mode = s->info.mode; |
| 532 | |
| 533 | assert(s->ioc); |
| 534 | |
| 535 | if (qiov) { |
| 536 | qio_channel_set_cork(s->ioc, true); |
| 537 | rc = nbd_send_request(s->ioc, request); |
| 538 | if (rc >= 0 && qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, |
| 539 | NULL) < 0) { |
| 540 | rc = -EIO; |
| 541 | } |
| 542 | qio_channel_set_cork(s->ioc, false); |
| 543 | } else { |
| 544 | rc = nbd_send_request(s->ioc, request); |
| 545 | } |
| 546 | qemu_co_mutex_unlock(&s->send_mutex); |
| 547 | |
| 548 | if (rc < 0) { |
| 549 | qemu_mutex_lock(&s->requests_lock); |
| 550 | err: |
| 551 | nbd_channel_error_locked(s, rc); |
| 552 | if (i != -1) { |
| 553 | s->requests[i].coroutine = NULL; |
| 554 | } |
| 555 | s->in_flight--; |
| 556 | qemu_co_queue_next(&s->free_sema); |
| 557 | qemu_mutex_unlock(&s->requests_lock); |
| 558 | } |
| 559 | return rc; |
| 560 | } |
| 561 | |
| 562 | static inline uint16_t payload_advance16(uint8_t **payload) |
| 563 | { |
| 564 | *payload += 2; |
| 565 | return lduw_be_p(*payload - 2); |
| 566 | } |
| 567 | |
| 568 | static inline uint32_t payload_advance32(uint8_t **payload) |
| 569 | { |
| 570 | *payload += 4; |
| 571 | return ldl_be_p(*payload - 4); |
| 572 | } |
| 573 | |
| 574 | static inline uint64_t payload_advance64(uint8_t **payload) |
| 575 | { |
| 576 | *payload += 8; |
| 577 | return ldq_be_p(*payload - 8); |
| 578 | } |
| 579 | |
| 580 | static int nbd_parse_offset_hole_payload(BDRVNBDState *s, |
| 581 | NBDStructuredReplyChunk *chunk, |
| 582 | uint8_t *payload, uint64_t orig_offset, |
| 583 | QEMUIOVector *qiov, Error **errp) |
| 584 | { |
| 585 | uint64_t offset; |
| 586 | uint32_t hole_size; |
| 587 | |
| 588 | if (chunk->length != sizeof(offset) + sizeof(hole_size)) { |
| 589 | error_setg(errp, "Protocol error: invalid payload for " |
| 590 | "NBD_REPLY_TYPE_OFFSET_HOLE"); |
| 591 | return -EINVAL; |
| 592 | } |
| 593 | |
| 594 | offset = payload_advance64(&payload); |
| 595 | hole_size = payload_advance32(&payload); |
| 596 | |
| 597 | if (!hole_size || offset < orig_offset || hole_size > qiov->size || |
| 598 | offset > orig_offset + qiov->size - hole_size) { |
| 599 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
| 600 | " region"); |
| 601 | return -EINVAL; |
| 602 | } |
| 603 | if (s->info.min_block && |
| 604 | !QEMU_IS_ALIGNED(hole_size, s->info.min_block)) { |
| 605 | trace_nbd_structured_read_compliance("hole"); |
| 606 | } |
| 607 | |
| 608 | qemu_iovec_memset(qiov, offset - orig_offset, 0, hole_size); |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * nbd_parse_blockstatus_payload |
| 615 | * Based on our request, we expect only one extent in reply, for the |
| 616 | * base:allocation context. |
| 617 | */ |
| 618 | static int nbd_parse_blockstatus_payload(BDRVNBDState *s, |
| 619 | NBDStructuredReplyChunk *chunk, |
| 620 | uint8_t *payload, bool wide, |
| 621 | uint64_t orig_length, |
| 622 | NBDExtent64 *extent, Error **errp) |
| 623 | { |
| 624 | uint32_t context_id; |
| 625 | uint32_t count; |
| 626 | size_t ext_len = wide ? sizeof(*extent) : sizeof(NBDExtent32); |
| 627 | size_t pay_len = sizeof(context_id) + wide * sizeof(count) + ext_len; |
| 628 | |
| 629 | /* The server succeeded, so it must have sent [at least] one extent */ |
| 630 | if (chunk->length < pay_len) { |
| 631 | error_setg(errp, "Protocol error: invalid payload for " |
| 632 | "NBD_REPLY_TYPE_BLOCK_STATUS"); |
| 633 | return -EINVAL; |
| 634 | } |
| 635 | |
| 636 | context_id = payload_advance32(&payload); |
| 637 | if (s->info.context_id != context_id) { |
| 638 | error_setg(errp, "Protocol error: unexpected context id %d for " |
| 639 | "NBD_REPLY_TYPE_BLOCK_STATUS, when negotiated context " |
| 640 | "id is %d", context_id, |
| 641 | s->info.context_id); |
| 642 | return -EINVAL; |
| 643 | } |
| 644 | |
| 645 | if (wide) { |
| 646 | count = payload_advance32(&payload); |
| 647 | extent->length = payload_advance64(&payload); |
| 648 | extent->flags = payload_advance64(&payload); |
| 649 | } else { |
| 650 | count = 0; |
| 651 | extent->length = payload_advance32(&payload); |
| 652 | extent->flags = payload_advance32(&payload); |
| 653 | } |
| 654 | |
| 655 | if (extent->length == 0) { |
| 656 | error_setg(errp, "Protocol error: server sent status chunk with " |
| 657 | "zero length"); |
| 658 | return -EINVAL; |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * A server sending unaligned block status is in violation of the |
| 663 | * protocol, but as qemu-nbd 3.1 is such a server (at least for |
| 664 | * POSIX files that are not a multiple of 512 bytes, since qemu |
| 665 | * rounds files up to 512-byte multiples but lseek(SEEK_HOLE) |
| 666 | * still sees an implicit hole beyond the real EOF), it's nicer to |
| 667 | * work around the misbehaving server. If the request included |
| 668 | * more than the final unaligned block, truncate it back to an |
| 669 | * aligned result; if the request was only the final block, round |
| 670 | * up to the full block and change the status to fully-allocated |
| 671 | * (always a safe status, even if it loses information). |
| 672 | */ |
| 673 | if (s->info.min_block && !QEMU_IS_ALIGNED(extent->length, |
| 674 | s->info.min_block)) { |
| 675 | trace_nbd_parse_blockstatus_compliance("extent length is unaligned"); |
| 676 | if (extent->length > s->info.min_block) { |
| 677 | extent->length = QEMU_ALIGN_DOWN(extent->length, |
| 678 | s->info.min_block); |
| 679 | } else { |
| 680 | extent->length = s->info.min_block; |
| 681 | extent->flags = 0; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * We used NBD_CMD_FLAG_REQ_ONE, so the server should not have |
| 687 | * sent us any more than one extent, nor should it have included |
| 688 | * status beyond our request in that extent. Furthermore, a wide |
| 689 | * server should have replied with an accurate count (we left |
| 690 | * count at 0 for a narrow server). However, it's easy enough to |
| 691 | * ignore the server's noncompliance without killing the |
| 692 | * connection; just ignore trailing extents, and clamp things to |
| 693 | * the length of our request. |
| 694 | */ |
| 695 | if (count != wide || chunk->length > pay_len) { |
| 696 | trace_nbd_parse_blockstatus_compliance("unexpected extent count"); |
| 697 | } |
| 698 | if (extent->length > orig_length) { |
| 699 | extent->length = orig_length; |
| 700 | trace_nbd_parse_blockstatus_compliance("extent length too large"); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * HACK: if we are using x-dirty-bitmaps to access |
| 705 | * qemu:allocation-depth, treat all depths > 2 the same as 2, |
| 706 | * since nbd_client_co_block_status is only expecting the low two |
| 707 | * bits to be set. |
| 708 | */ |
| 709 | if (s->alloc_depth && extent->flags > 2) { |
| 710 | extent->flags = 2; |
| 711 | } |
| 712 | |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * nbd_parse_error_payload |
| 718 | * on success @errp contains message describing nbd error reply |
| 719 | */ |
| 720 | static int nbd_parse_error_payload(NBDStructuredReplyChunk *chunk, |
| 721 | uint8_t *payload, int *request_ret, |
| 722 | Error **errp) |
| 723 | { |
| 724 | uint32_t error; |
| 725 | uint16_t message_size; |
| 726 | |
| 727 | assert(chunk->type & (1 << 15)); |
| 728 | |
| 729 | if (chunk->length < sizeof(error) + sizeof(message_size)) { |
| 730 | error_setg(errp, |
| 731 | "Protocol error: invalid payload for structured error"); |
| 732 | return -EINVAL; |
| 733 | } |
| 734 | |
| 735 | error = nbd_errno_to_system_errno(payload_advance32(&payload)); |
| 736 | if (error == 0) { |
| 737 | error_setg(errp, "Protocol error: server sent structured error chunk " |
| 738 | "with error = 0"); |
| 739 | return -EINVAL; |
| 740 | } |
| 741 | |
| 742 | *request_ret = -error; |
| 743 | message_size = payload_advance16(&payload); |
| 744 | |
| 745 | if (message_size > chunk->length - sizeof(error) - sizeof(message_size)) { |
| 746 | error_setg(errp, "Protocol error: server sent structured error chunk " |
| 747 | "with incorrect message size"); |
| 748 | return -EINVAL; |
| 749 | } |
| 750 | |
| 751 | /* TODO: Add a trace point to mention the server complaint */ |
| 752 | |
| 753 | /* TODO handle ERROR_OFFSET */ |
| 754 | |
| 755 | return 0; |
| 756 | } |
| 757 | |
| 758 | static int coroutine_fn |
| 759 | nbd_co_receive_offset_data_payload(BDRVNBDState *s, uint64_t orig_offset, |
| 760 | QEMUIOVector *qiov, Error **errp) |
| 761 | { |
| 762 | QEMUIOVector sub_qiov; |
| 763 | uint64_t offset; |
| 764 | size_t data_size; |
| 765 | int ret; |
| 766 | NBDStructuredReplyChunk *chunk = &s->reply.structured; |
| 767 | |
| 768 | assert(nbd_reply_is_structured(&s->reply)); |
| 769 | |
| 770 | /* The NBD spec requires at least one byte of payload */ |
| 771 | if (chunk->length <= sizeof(offset)) { |
| 772 | error_setg(errp, "Protocol error: invalid payload for " |
| 773 | "NBD_REPLY_TYPE_OFFSET_DATA"); |
| 774 | return -EINVAL; |
| 775 | } |
| 776 | |
| 777 | if (nbd_read64(s->ioc, &offset, "OFFSET_DATA offset", errp) < 0) { |
| 778 | return -EIO; |
| 779 | } |
| 780 | |
| 781 | data_size = chunk->length - sizeof(offset); |
| 782 | assert(data_size); |
| 783 | if (offset < orig_offset || data_size > qiov->size || |
| 784 | offset > orig_offset + qiov->size - data_size) { |
| 785 | error_setg(errp, "Protocol error: server sent chunk exceeding requested" |
| 786 | " region"); |
| 787 | return -EINVAL; |
| 788 | } |
| 789 | if (s->info.min_block && !QEMU_IS_ALIGNED(data_size, s->info.min_block)) { |
| 790 | trace_nbd_structured_read_compliance("data"); |
| 791 | } |
| 792 | |
| 793 | qemu_iovec_init(&sub_qiov, qiov->niov); |
| 794 | qemu_iovec_concat(&sub_qiov, qiov, offset - orig_offset, data_size); |
| 795 | ret = qio_channel_readv_all(s->ioc, sub_qiov.iov, sub_qiov.niov, errp); |
| 796 | qemu_iovec_destroy(&sub_qiov); |
| 797 | |
| 798 | return ret < 0 ? -EIO : 0; |
| 799 | } |
| 800 | |
| 801 | #define NBD_MAX_MALLOC_PAYLOAD 1000 |
| 802 | static coroutine_fn int nbd_co_receive_structured_payload( |
| 803 | BDRVNBDState *s, void **payload, Error **errp) |
| 804 | { |
| 805 | int ret; |
| 806 | uint32_t len; |
| 807 | |
| 808 | assert(nbd_reply_is_structured(&s->reply)); |
| 809 | |
| 810 | len = s->reply.structured.length; |
| 811 | |
| 812 | if (len == 0) { |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | if (payload == NULL) { |
| 817 | error_setg(errp, "Unexpected structured payload"); |
| 818 | return -EINVAL; |
| 819 | } |
| 820 | |
| 821 | if (len > NBD_MAX_MALLOC_PAYLOAD) { |
| 822 | error_setg(errp, "Payload too large"); |
| 823 | return -EINVAL; |
| 824 | } |
| 825 | |
| 826 | *payload = g_new(char, len); |
| 827 | ret = nbd_read(s->ioc, *payload, len, "structured payload", errp); |
| 828 | if (ret < 0) { |
| 829 | g_free(*payload); |
| 830 | *payload = NULL; |
| 831 | return ret; |
| 832 | } |
| 833 | |
| 834 | return 0; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * nbd_co_do_receive_one_chunk |
| 839 | * for simple reply: |
| 840 | * set request_ret to received reply error |
| 841 | * if qiov is not NULL: read payload to @qiov |
| 842 | * for structured reply chunk: |
| 843 | * if error chunk: read payload, set @request_ret, do not set @payload |
| 844 | * else if offset_data chunk: read payload data to @qiov, do not set @payload |
| 845 | * else: read payload to @payload |
| 846 | * |
| 847 | * If function fails, @errp contains corresponding error message, and the |
| 848 | * connection with the server is suspect. If it returns 0, then the |
| 849 | * transaction succeeded (although @request_ret may be a negative errno |
| 850 | * corresponding to the server's error reply), and errp is unchanged. |
| 851 | */ |
| 852 | static coroutine_fn int nbd_co_do_receive_one_chunk( |
| 853 | BDRVNBDState *s, uint64_t cookie, bool only_structured, |
| 854 | int *request_ret, QEMUIOVector *qiov, void **payload, Error **errp) |
| 855 | { |
| 856 | ERRP_GUARD(); |
| 857 | int ret; |
| 858 | int i = COOKIE_TO_INDEX(cookie); |
| 859 | void *local_payload = NULL; |
| 860 | NBDStructuredReplyChunk *chunk; |
| 861 | |
| 862 | if (payload) { |
| 863 | *payload = NULL; |
| 864 | } |
| 865 | *request_ret = 0; |
| 866 | |
| 867 | ret = nbd_receive_replies(s, cookie, errp); |
| 868 | if (ret < 0) { |
| 869 | error_prepend(errp, "Connection closed: "); |
| 870 | return -EIO; |
| 871 | } |
| 872 | assert(s->ioc); |
| 873 | |
| 874 | assert(s->reply.cookie == cookie); |
| 875 | |
| 876 | if (nbd_reply_is_simple(&s->reply)) { |
| 877 | if (only_structured) { |
| 878 | error_setg(errp, "Protocol error: simple reply when structured " |
| 879 | "reply chunk was expected"); |
| 880 | return -EINVAL; |
| 881 | } |
| 882 | |
| 883 | *request_ret = -nbd_errno_to_system_errno(s->reply.simple.error); |
| 884 | if (*request_ret < 0 || !qiov) { |
| 885 | return 0; |
| 886 | } |
| 887 | |
| 888 | return qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov, |
| 889 | errp) < 0 ? -EIO : 0; |
| 890 | } |
| 891 | |
| 892 | /* handle structured reply chunk */ |
| 893 | assert(s->info.mode >= NBD_MODE_STRUCTURED); |
| 894 | chunk = &s->reply.structured; |
| 895 | |
| 896 | if (chunk->type == NBD_REPLY_TYPE_NONE) { |
| 897 | if (!(chunk->flags & NBD_REPLY_FLAG_DONE)) { |
| 898 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk without" |
| 899 | " NBD_REPLY_FLAG_DONE flag set"); |
| 900 | return -EINVAL; |
| 901 | } |
| 902 | if (chunk->length) { |
| 903 | error_setg(errp, "Protocol error: NBD_REPLY_TYPE_NONE chunk with" |
| 904 | " nonzero length"); |
| 905 | return -EINVAL; |
| 906 | } |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | if (chunk->type == NBD_REPLY_TYPE_OFFSET_DATA) { |
| 911 | if (!qiov) { |
| 912 | error_setg(errp, "Unexpected NBD_REPLY_TYPE_OFFSET_DATA chunk"); |
| 913 | return -EINVAL; |
| 914 | } |
| 915 | |
| 916 | return nbd_co_receive_offset_data_payload(s, s->requests[i].offset, |
| 917 | qiov, errp); |
| 918 | } |
| 919 | |
| 920 | if (nbd_reply_type_is_error(chunk->type)) { |
| 921 | payload = &local_payload; |
| 922 | } |
| 923 | |
| 924 | ret = nbd_co_receive_structured_payload(s, payload, errp); |
| 925 | if (ret < 0) { |
| 926 | return ret; |
| 927 | } |
| 928 | |
| 929 | if (nbd_reply_type_is_error(chunk->type)) { |
| 930 | ret = nbd_parse_error_payload(chunk, local_payload, request_ret, errp); |
| 931 | g_free(local_payload); |
| 932 | return ret; |
| 933 | } |
| 934 | |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * nbd_co_receive_one_chunk |
| 940 | * Read reply, wake up connection_co and set s->quit if needed. |
| 941 | * Return value is a fatal error code or normal nbd reply error code |
| 942 | */ |
| 943 | static coroutine_fn int nbd_co_receive_one_chunk( |
| 944 | BDRVNBDState *s, uint64_t cookie, bool only_structured, |
| 945 | int *request_ret, QEMUIOVector *qiov, NBDReply *reply, void **payload, |
| 946 | Error **errp) |
| 947 | { |
| 948 | int ret = nbd_co_do_receive_one_chunk(s, cookie, only_structured, |
| 949 | request_ret, qiov, payload, errp); |
| 950 | |
| 951 | if (ret < 0) { |
| 952 | memset(reply, 0, sizeof(*reply)); |
| 953 | nbd_channel_error(s, ret); |
| 954 | } else { |
| 955 | /* For assert at loop start in nbd_connection_entry */ |
| 956 | *reply = s->reply; |
| 957 | } |
| 958 | s->reply.cookie = 0; |
| 959 | |
| 960 | nbd_recv_coroutines_wake(s); |
| 961 | |
| 962 | return ret; |
| 963 | } |
| 964 | |
| 965 | typedef struct NBDReplyChunkIter { |
| 966 | int ret; |
| 967 | int request_ret; |
| 968 | Error *err; |
| 969 | bool done, only_structured; |
| 970 | } NBDReplyChunkIter; |
| 971 | |
| 972 | static void nbd_iter_channel_error(NBDReplyChunkIter *iter, |
| 973 | int ret, Error **local_err) |
| 974 | { |
| 975 | assert(local_err && *local_err); |
| 976 | assert(ret < 0); |
| 977 | |
| 978 | if (!iter->ret) { |
| 979 | iter->ret = ret; |
| 980 | error_propagate(&iter->err, *local_err); |
| 981 | } else { |
| 982 | error_free(*local_err); |
| 983 | } |
| 984 | |
| 985 | *local_err = NULL; |
| 986 | } |
| 987 | |
| 988 | static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret) |
| 989 | { |
| 990 | assert(ret < 0); |
| 991 | |
| 992 | if (!iter->request_ret) { |
| 993 | iter->request_ret = ret; |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * NBD_FOREACH_REPLY_CHUNK |
| 999 | * The pointer stored in @payload requires g_free() to free it. |
| 1000 | */ |
| 1001 | #define NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, structured, \ |
| 1002 | qiov, reply, payload) \ |
| 1003 | for (iter = (NBDReplyChunkIter) { .only_structured = structured }; \ |
| 1004 | nbd_reply_chunk_iter_receive(s, &iter, cookie, qiov, reply, payload);) |
| 1005 | |
| 1006 | /* |
| 1007 | * nbd_reply_chunk_iter_receive |
| 1008 | * The pointer stored in @payload requires g_free() to free it. |
| 1009 | */ |
| 1010 | static bool coroutine_fn nbd_reply_chunk_iter_receive(BDRVNBDState *s, |
| 1011 | NBDReplyChunkIter *iter, |
| 1012 | uint64_t cookie, |
| 1013 | QEMUIOVector *qiov, |
| 1014 | NBDReply *reply, |
| 1015 | void **payload) |
| 1016 | { |
| 1017 | int ret, request_ret; |
| 1018 | NBDReply local_reply; |
| 1019 | NBDStructuredReplyChunk *chunk; |
| 1020 | Error *local_err = NULL; |
| 1021 | |
| 1022 | if (iter->done) { |
| 1023 | /* Previous iteration was last. */ |
| 1024 | goto break_loop; |
| 1025 | } |
| 1026 | |
| 1027 | if (reply == NULL) { |
| 1028 | reply = &local_reply; |
| 1029 | } |
| 1030 | |
| 1031 | ret = nbd_co_receive_one_chunk(s, cookie, iter->only_structured, |
| 1032 | &request_ret, qiov, reply, payload, |
| 1033 | &local_err); |
| 1034 | if (ret < 0) { |
| 1035 | nbd_iter_channel_error(iter, ret, &local_err); |
| 1036 | } else if (request_ret < 0) { |
| 1037 | nbd_iter_request_error(iter, request_ret); |
| 1038 | } |
| 1039 | |
| 1040 | /* Do not execute the body of NBD_FOREACH_REPLY_CHUNK for simple reply. */ |
| 1041 | if (nbd_reply_is_simple(reply) || iter->ret < 0) { |
| 1042 | goto break_loop; |
| 1043 | } |
| 1044 | |
| 1045 | chunk = &reply->structured; |
| 1046 | iter->only_structured = true; |
| 1047 | |
| 1048 | if (chunk->type == NBD_REPLY_TYPE_NONE) { |
| 1049 | /* NBD_REPLY_FLAG_DONE is already checked in nbd_co_receive_one_chunk */ |
| 1050 | assert(chunk->flags & NBD_REPLY_FLAG_DONE); |
| 1051 | goto break_loop; |
| 1052 | } |
| 1053 | |
| 1054 | if (chunk->flags & NBD_REPLY_FLAG_DONE) { |
| 1055 | /* This iteration is last. */ |
| 1056 | iter->done = true; |
| 1057 | } |
| 1058 | |
| 1059 | /* Execute the loop body */ |
| 1060 | return true; |
| 1061 | |
| 1062 | break_loop: |
| 1063 | qemu_mutex_lock(&s->requests_lock); |
| 1064 | s->requests[COOKIE_TO_INDEX(cookie)].coroutine = NULL; |
| 1065 | s->in_flight--; |
| 1066 | qemu_co_queue_next(&s->free_sema); |
| 1067 | qemu_mutex_unlock(&s->requests_lock); |
| 1068 | |
| 1069 | return false; |
| 1070 | } |
| 1071 | |
| 1072 | static int coroutine_fn |
| 1073 | nbd_co_receive_return_code(BDRVNBDState *s, uint64_t cookie, |
| 1074 | int *request_ret, Error **errp) |
| 1075 | { |
| 1076 | NBDReplyChunkIter iter; |
| 1077 | |
| 1078 | NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, false, NULL, NULL, NULL) { |
| 1079 | /* nbd_reply_chunk_iter_receive does all the work */ |
| 1080 | } |
| 1081 | |
| 1082 | error_propagate(errp, iter.err); |
| 1083 | *request_ret = iter.request_ret; |
| 1084 | return iter.ret; |
| 1085 | } |
| 1086 | |
| 1087 | static int coroutine_fn |
| 1088 | nbd_co_receive_cmdread_reply(BDRVNBDState *s, uint64_t cookie, |
| 1089 | uint64_t offset, QEMUIOVector *qiov, |
| 1090 | int *request_ret, Error **errp) |
| 1091 | { |
| 1092 | NBDReplyChunkIter iter; |
| 1093 | NBDReply reply; |
| 1094 | void *payload = NULL; |
| 1095 | Error *local_err = NULL; |
| 1096 | |
| 1097 | NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, |
| 1098 | s->info.mode >= NBD_MODE_STRUCTURED, |
| 1099 | qiov, &reply, &payload) |
| 1100 | { |
| 1101 | int ret; |
| 1102 | NBDStructuredReplyChunk *chunk = &reply.structured; |
| 1103 | |
| 1104 | assert(nbd_reply_is_structured(&reply)); |
| 1105 | |
| 1106 | switch (chunk->type) { |
| 1107 | case NBD_REPLY_TYPE_OFFSET_DATA: |
| 1108 | /* |
| 1109 | * special cased in nbd_co_receive_one_chunk, data is already |
| 1110 | * in qiov |
| 1111 | */ |
| 1112 | break; |
| 1113 | case NBD_REPLY_TYPE_OFFSET_HOLE: |
| 1114 | ret = nbd_parse_offset_hole_payload(s, &reply.structured, payload, |
| 1115 | offset, qiov, &local_err); |
| 1116 | if (ret < 0) { |
| 1117 | nbd_channel_error(s, ret); |
| 1118 | nbd_iter_channel_error(&iter, ret, &local_err); |
| 1119 | } |
| 1120 | break; |
| 1121 | default: |
| 1122 | if (!nbd_reply_type_is_error(chunk->type)) { |
| 1123 | /* not allowed reply type */ |
| 1124 | nbd_channel_error(s, -EINVAL); |
| 1125 | error_setg(&local_err, |
| 1126 | "Unexpected reply type: %d (%s) for CMD_READ", |
| 1127 | chunk->type, nbd_reply_type_lookup(chunk->type)); |
| 1128 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | g_free(payload); |
| 1133 | payload = NULL; |
| 1134 | } |
| 1135 | |
| 1136 | error_propagate(errp, iter.err); |
| 1137 | *request_ret = iter.request_ret; |
| 1138 | return iter.ret; |
| 1139 | } |
| 1140 | |
| 1141 | static int coroutine_fn |
| 1142 | nbd_co_receive_blockstatus_reply(BDRVNBDState *s, uint64_t cookie, |
| 1143 | uint64_t length, NBDExtent64 *extent, |
| 1144 | int *request_ret, Error **errp) |
| 1145 | { |
| 1146 | NBDReplyChunkIter iter; |
| 1147 | NBDReply reply; |
| 1148 | void *payload = NULL; |
| 1149 | Error *local_err = NULL; |
| 1150 | bool received = false; |
| 1151 | |
| 1152 | assert(!extent->length); |
| 1153 | NBD_FOREACH_REPLY_CHUNK(s, iter, cookie, false, NULL, &reply, &payload) { |
| 1154 | int ret; |
| 1155 | NBDStructuredReplyChunk *chunk = &reply.structured; |
| 1156 | bool wide; |
| 1157 | |
| 1158 | assert(nbd_reply_is_structured(&reply)); |
| 1159 | |
| 1160 | switch (chunk->type) { |
| 1161 | case NBD_REPLY_TYPE_BLOCK_STATUS_EXT: |
| 1162 | case NBD_REPLY_TYPE_BLOCK_STATUS: |
| 1163 | wide = chunk->type == NBD_REPLY_TYPE_BLOCK_STATUS_EXT; |
| 1164 | if ((s->info.mode >= NBD_MODE_EXTENDED) != wide) { |
| 1165 | trace_nbd_extended_headers_compliance("block_status"); |
| 1166 | } |
| 1167 | if (received) { |
| 1168 | nbd_channel_error(s, -EINVAL); |
| 1169 | error_setg(&local_err, "Several BLOCK_STATUS chunks in reply"); |
| 1170 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| 1171 | } |
| 1172 | received = true; |
| 1173 | |
| 1174 | ret = nbd_parse_blockstatus_payload( |
| 1175 | s, &reply.structured, payload, wide, |
| 1176 | length, extent, &local_err); |
| 1177 | if (ret < 0) { |
| 1178 | nbd_channel_error(s, ret); |
| 1179 | nbd_iter_channel_error(&iter, ret, &local_err); |
| 1180 | } |
| 1181 | break; |
| 1182 | default: |
| 1183 | if (!nbd_reply_type_is_error(chunk->type)) { |
| 1184 | nbd_channel_error(s, -EINVAL); |
| 1185 | error_setg(&local_err, |
| 1186 | "Unexpected reply type: %d (%s) " |
| 1187 | "for CMD_BLOCK_STATUS", |
| 1188 | chunk->type, nbd_reply_type_lookup(chunk->type)); |
| 1189 | nbd_iter_channel_error(&iter, -EINVAL, &local_err); |
| 1190 | } |
| 1191 | } |
| 1192 | |
| 1193 | g_free(payload); |
| 1194 | payload = NULL; |
| 1195 | } |
| 1196 | |
| 1197 | if (!extent->length && !iter.request_ret) { |
| 1198 | error_setg(&local_err, "Server did not reply with any status extents"); |
| 1199 | nbd_iter_channel_error(&iter, -EIO, &local_err); |
| 1200 | } |
| 1201 | |
| 1202 | error_propagate(errp, iter.err); |
| 1203 | *request_ret = iter.request_ret; |
| 1204 | return iter.ret; |
| 1205 | } |
| 1206 | |
| 1207 | static int coroutine_fn GRAPH_RDLOCK |
| 1208 | nbd_co_request(BlockDriverState *bs, NBDRequest *request, |
| 1209 | QEMUIOVector *write_qiov) |
| 1210 | { |
| 1211 | int ret, request_ret; |
| 1212 | Error *local_err = NULL; |
| 1213 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1214 | |
| 1215 | assert(request->type != NBD_CMD_READ); |
| 1216 | if (write_qiov) { |
| 1217 | assert(request->type == NBD_CMD_WRITE); |
| 1218 | assert(request->len == iov_size(write_qiov->iov, write_qiov->niov)); |
| 1219 | } else { |
| 1220 | assert(request->type != NBD_CMD_WRITE); |
| 1221 | } |
| 1222 | |
| 1223 | do { |
| 1224 | ret = nbd_co_send_request(bs, request, write_qiov); |
| 1225 | if (ret < 0) { |
| 1226 | continue; |
| 1227 | } |
| 1228 | |
| 1229 | ret = nbd_co_receive_return_code(s, request->cookie, |
| 1230 | &request_ret, &local_err); |
| 1231 | if (local_err) { |
| 1232 | trace_nbd_co_request_fail(request->from, request->len, |
| 1233 | request->cookie, request->flags, |
| 1234 | request->type, |
| 1235 | nbd_cmd_lookup(request->type), |
| 1236 | ret, error_get_pretty(local_err)); |
| 1237 | error_free(local_err); |
| 1238 | local_err = NULL; |
| 1239 | } |
| 1240 | } while (ret < 0 && nbd_client_will_reconnect(s)); |
| 1241 | |
| 1242 | return ret ? ret : request_ret; |
| 1243 | } |
| 1244 | |
| 1245 | static int coroutine_fn GRAPH_RDLOCK |
| 1246 | nbd_client_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 1247 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 1248 | { |
| 1249 | int ret, request_ret; |
| 1250 | Error *local_err = NULL; |
| 1251 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1252 | NBDRequest request = { |
| 1253 | .type = NBD_CMD_READ, |
| 1254 | .from = offset, |
| 1255 | .len = bytes, |
| 1256 | }; |
| 1257 | |
| 1258 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
| 1259 | |
| 1260 | if (!bytes) { |
| 1261 | return 0; |
| 1262 | } |
| 1263 | /* |
| 1264 | * Work around the fact that the block layer doesn't do |
| 1265 | * byte-accurate sizing yet - if the read exceeds the server's |
| 1266 | * advertised size because the block layer rounded size up, then |
| 1267 | * truncate the request to the server and tail-pad with zero. |
| 1268 | */ |
| 1269 | if (offset >= s->info.size) { |
| 1270 | assert(bytes < BDRV_SECTOR_SIZE); |
| 1271 | qemu_iovec_memset(qiov, 0, 0, bytes); |
| 1272 | return 0; |
| 1273 | } |
| 1274 | if (offset + bytes > s->info.size) { |
| 1275 | uint64_t slop = offset + bytes - s->info.size; |
| 1276 | |
| 1277 | assert(slop < BDRV_SECTOR_SIZE); |
| 1278 | qemu_iovec_memset(qiov, bytes - slop, 0, slop); |
| 1279 | request.len -= slop; |
| 1280 | } |
| 1281 | |
| 1282 | do { |
| 1283 | ret = nbd_co_send_request(bs, &request, NULL); |
| 1284 | if (ret < 0) { |
| 1285 | continue; |
| 1286 | } |
| 1287 | |
| 1288 | ret = nbd_co_receive_cmdread_reply(s, request.cookie, offset, qiov, |
| 1289 | &request_ret, &local_err); |
| 1290 | if (local_err) { |
| 1291 | trace_nbd_co_request_fail(request.from, request.len, request.cookie, |
| 1292 | request.flags, request.type, |
| 1293 | nbd_cmd_lookup(request.type), |
| 1294 | ret, error_get_pretty(local_err)); |
| 1295 | error_free(local_err); |
| 1296 | local_err = NULL; |
| 1297 | } |
| 1298 | } while (ret < 0 && nbd_client_will_reconnect(s)); |
| 1299 | |
| 1300 | return ret ? ret : request_ret; |
| 1301 | } |
| 1302 | |
| 1303 | static int coroutine_fn GRAPH_RDLOCK |
| 1304 | nbd_client_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 1305 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 1306 | { |
| 1307 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1308 | NBDRequest request = { |
| 1309 | .type = NBD_CMD_WRITE, |
| 1310 | .from = offset, |
| 1311 | .len = bytes, |
| 1312 | }; |
| 1313 | |
| 1314 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| 1315 | if (flags & BDRV_REQ_FUA) { |
| 1316 | assert(s->info.flags & NBD_FLAG_SEND_FUA); |
| 1317 | request.flags |= NBD_CMD_FLAG_FUA; |
| 1318 | } |
| 1319 | |
| 1320 | assert(bytes <= NBD_MAX_BUFFER_SIZE); |
| 1321 | |
| 1322 | if (!bytes) { |
| 1323 | return 0; |
| 1324 | } |
| 1325 | return nbd_co_request(bs, &request, qiov); |
| 1326 | } |
| 1327 | |
| 1328 | static int coroutine_fn GRAPH_RDLOCK |
| 1329 | nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 1330 | BdrvRequestFlags flags) |
| 1331 | { |
| 1332 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1333 | NBDRequest request = { |
| 1334 | .type = NBD_CMD_WRITE_ZEROES, |
| 1335 | .from = offset, |
| 1336 | .len = bytes, |
| 1337 | }; |
| 1338 | |
| 1339 | /* rely on max_pwrite_zeroes */ |
| 1340 | assert(bytes <= UINT32_MAX || s->info.mode >= NBD_MODE_EXTENDED); |
| 1341 | |
| 1342 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| 1343 | if (!(s->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { |
| 1344 | return -ENOTSUP; |
| 1345 | } |
| 1346 | |
| 1347 | if (flags & BDRV_REQ_FUA) { |
| 1348 | assert(s->info.flags & NBD_FLAG_SEND_FUA); |
| 1349 | request.flags |= NBD_CMD_FLAG_FUA; |
| 1350 | } |
| 1351 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { |
| 1352 | request.flags |= NBD_CMD_FLAG_NO_HOLE; |
| 1353 | } |
| 1354 | if (flags & BDRV_REQ_NO_FALLBACK) { |
| 1355 | assert(s->info.flags & NBD_FLAG_SEND_FAST_ZERO); |
| 1356 | request.flags |= NBD_CMD_FLAG_FAST_ZERO; |
| 1357 | } |
| 1358 | |
| 1359 | if (!bytes) { |
| 1360 | return 0; |
| 1361 | } |
| 1362 | return nbd_co_request(bs, &request, NULL); |
| 1363 | } |
| 1364 | |
| 1365 | static int coroutine_fn GRAPH_RDLOCK nbd_client_co_flush(BlockDriverState *bs) |
| 1366 | { |
| 1367 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1368 | NBDRequest request = { .type = NBD_CMD_FLUSH }; |
| 1369 | |
| 1370 | if (!(s->info.flags & NBD_FLAG_SEND_FLUSH)) { |
| 1371 | return 0; |
| 1372 | } |
| 1373 | |
| 1374 | request.from = 0; |
| 1375 | request.len = 0; |
| 1376 | |
| 1377 | return nbd_co_request(bs, &request, NULL); |
| 1378 | } |
| 1379 | |
| 1380 | static int coroutine_fn GRAPH_RDLOCK |
| 1381 | nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 1382 | { |
| 1383 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1384 | NBDRequest request = { |
| 1385 | .type = NBD_CMD_TRIM, |
| 1386 | .from = offset, |
| 1387 | .len = bytes, |
| 1388 | }; |
| 1389 | |
| 1390 | /* rely on max_pdiscard */ |
| 1391 | assert(bytes <= UINT32_MAX || s->info.mode >= NBD_MODE_EXTENDED); |
| 1392 | |
| 1393 | assert(!(s->info.flags & NBD_FLAG_READ_ONLY)); |
| 1394 | if (!(s->info.flags & NBD_FLAG_SEND_TRIM) || !bytes) { |
| 1395 | return 0; |
| 1396 | } |
| 1397 | |
| 1398 | return nbd_co_request(bs, &request, NULL); |
| 1399 | } |
| 1400 | |
| 1401 | static int coroutine_fn GRAPH_RDLOCK nbd_client_co_block_status( |
| 1402 | BlockDriverState *bs, unsigned int mode, int64_t offset, |
| 1403 | int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file) |
| 1404 | { |
| 1405 | int ret, request_ret; |
| 1406 | NBDExtent64 extent = { 0 }; |
| 1407 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1408 | Error *local_err = NULL; |
| 1409 | |
| 1410 | NBDRequest request = { |
| 1411 | .type = NBD_CMD_BLOCK_STATUS, |
| 1412 | .from = offset, |
| 1413 | .len = MIN(bytes, s->info.size - offset), |
| 1414 | .flags = NBD_CMD_FLAG_REQ_ONE, |
| 1415 | }; |
| 1416 | |
| 1417 | if (!s->info.base_allocation) { |
| 1418 | *pnum = bytes; |
| 1419 | *map = offset; |
| 1420 | *file = bs; |
| 1421 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| 1422 | } |
| 1423 | if (s->info.mode < NBD_MODE_EXTENDED) { |
| 1424 | request.len = MIN(QEMU_ALIGN_DOWN(INT_MAX, bs->bl.request_alignment), |
| 1425 | request.len); |
| 1426 | } |
| 1427 | |
| 1428 | /* |
| 1429 | * Work around the fact that the block layer doesn't do |
| 1430 | * byte-accurate sizing yet - if the status request exceeds the |
| 1431 | * server's advertised size because the block layer rounded size |
| 1432 | * up, we truncated the request to the server (above), or are |
| 1433 | * called on just the hole. |
| 1434 | */ |
| 1435 | if (offset >= s->info.size) { |
| 1436 | *pnum = bytes; |
| 1437 | assert(bytes < BDRV_SECTOR_SIZE); |
| 1438 | /* Intentionally don't report offset_valid for the hole */ |
| 1439 | return BDRV_BLOCK_ZERO; |
| 1440 | } |
| 1441 | |
| 1442 | if (s->info.min_block) { |
| 1443 | assert(QEMU_IS_ALIGNED(request.len, s->info.min_block)); |
| 1444 | } |
| 1445 | do { |
| 1446 | ret = nbd_co_send_request(bs, &request, NULL); |
| 1447 | if (ret < 0) { |
| 1448 | continue; |
| 1449 | } |
| 1450 | |
| 1451 | ret = nbd_co_receive_blockstatus_reply(s, request.cookie, bytes, |
| 1452 | &extent, &request_ret, |
| 1453 | &local_err); |
| 1454 | if (local_err) { |
| 1455 | trace_nbd_co_request_fail(request.from, request.len, request.cookie, |
| 1456 | request.flags, request.type, |
| 1457 | nbd_cmd_lookup(request.type), |
| 1458 | ret, error_get_pretty(local_err)); |
| 1459 | error_free(local_err); |
| 1460 | local_err = NULL; |
| 1461 | } |
| 1462 | } while (ret < 0 && nbd_client_will_reconnect(s)); |
| 1463 | |
| 1464 | if (ret < 0 || request_ret < 0) { |
| 1465 | return ret ? ret : request_ret; |
| 1466 | } |
| 1467 | |
| 1468 | assert(extent.length); |
| 1469 | *pnum = extent.length; |
| 1470 | *map = offset; |
| 1471 | *file = bs; |
| 1472 | return (extent.flags & NBD_STATE_HOLE ? 0 : BDRV_BLOCK_DATA) | |
| 1473 | (extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0) | |
| 1474 | BDRV_BLOCK_OFFSET_VALID; |
| 1475 | } |
| 1476 | |
| 1477 | static int nbd_client_reopen_prepare(BDRVReopenState *state, |
| 1478 | BlockReopenQueue *queue, Error **errp) |
| 1479 | { |
| 1480 | BDRVNBDState *s = (BDRVNBDState *)state->bs->opaque; |
| 1481 | |
| 1482 | if ((state->flags & BDRV_O_RDWR) && (s->info.flags & NBD_FLAG_READ_ONLY)) { |
| 1483 | error_setg(errp, "Can't reopen read-only NBD mount as read/write"); |
| 1484 | return -EACCES; |
| 1485 | } |
| 1486 | return 0; |
| 1487 | } |
| 1488 | |
| 1489 | static void nbd_yank(void *opaque) |
| 1490 | { |
| 1491 | BlockDriverState *bs = opaque; |
| 1492 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1493 | |
| 1494 | QEMU_LOCK_GUARD(&s->requests_lock); |
| 1495 | qio_channel_shutdown(s->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); |
| 1496 | s->state = NBD_CLIENT_QUIT; |
| 1497 | } |
| 1498 | |
| 1499 | static void nbd_client_close(BlockDriverState *bs) |
| 1500 | { |
| 1501 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1502 | NBDRequest request = { .type = NBD_CMD_DISC, .mode = s->info.mode }; |
| 1503 | |
| 1504 | if (s->ioc) { |
| 1505 | nbd_send_request(s->ioc, &request); |
| 1506 | } |
| 1507 | |
| 1508 | nbd_teardown_connection(bs); |
| 1509 | } |
| 1510 | |
| 1511 | |
| 1512 | /* |
| 1513 | * Parse nbd_open options |
| 1514 | */ |
| 1515 | |
| 1516 | static int nbd_parse_uri(const char *filename, QDict *options) |
| 1517 | { |
| 1518 | g_autoptr(GUri) uri = g_uri_parse(filename, G_URI_FLAGS_NONE, NULL); |
| 1519 | g_autoptr(GHashTable) qp = NULL; |
| 1520 | const char *p; |
| 1521 | int qp_n; |
| 1522 | bool is_unix; |
| 1523 | const char *uri_scheme, *uri_query, *uri_server; |
| 1524 | int uri_port; |
| 1525 | |
| 1526 | if (!uri) { |
| 1527 | return -EINVAL; |
| 1528 | } |
| 1529 | |
| 1530 | /* transport */ |
| 1531 | uri_scheme = g_uri_get_scheme(uri); |
| 1532 | if (!g_strcmp0(uri_scheme, "nbd")) { |
| 1533 | is_unix = false; |
| 1534 | } else if (!g_strcmp0(uri_scheme, "nbd+tcp")) { |
| 1535 | is_unix = false; |
| 1536 | } else if (!g_strcmp0(uri_scheme, "nbd+unix")) { |
| 1537 | is_unix = true; |
| 1538 | } else { |
| 1539 | return -EINVAL; |
| 1540 | } |
| 1541 | |
| 1542 | p = g_uri_get_path(uri) ?: ""; |
| 1543 | if (p[0] == '/') { |
| 1544 | p++; |
| 1545 | } |
| 1546 | if (p[0]) { |
| 1547 | qdict_put_str(options, "export", p); |
| 1548 | } |
| 1549 | |
| 1550 | uri_query = g_uri_get_query(uri); |
| 1551 | if (uri_query) { |
| 1552 | qp = g_uri_parse_params(uri_query, -1, "&", G_URI_PARAMS_NONE, NULL); |
| 1553 | if (!qp) { |
| 1554 | return -EINVAL; |
| 1555 | } |
| 1556 | qp_n = g_hash_table_size(qp); |
| 1557 | if (qp_n > 1 || (is_unix && !qp_n) || (!is_unix && qp_n)) { |
| 1558 | return -EINVAL; |
| 1559 | } |
| 1560 | } |
| 1561 | |
| 1562 | uri_server = g_uri_get_host(uri); |
| 1563 | if (uri_server && !uri_server[0]) { |
| 1564 | uri_server = NULL; |
| 1565 | } |
| 1566 | uri_port = g_uri_get_port(uri); |
| 1567 | |
| 1568 | if (is_unix) { |
| 1569 | /* nbd+unix:///export?socket=path */ |
| 1570 | const char *uri_socket = g_hash_table_lookup(qp, "socket"); |
| 1571 | if (uri_server || uri_port != -1 || !uri_socket) { |
| 1572 | return -EINVAL; |
| 1573 | } |
| 1574 | qdict_put_str(options, "server.type", "unix"); |
| 1575 | qdict_put_str(options, "server.path", uri_socket); |
| 1576 | } else { |
| 1577 | char *port_str; |
| 1578 | |
| 1579 | /* nbd[+tcp]://host[:port]/export */ |
| 1580 | if (!uri_server) { |
| 1581 | return -EINVAL; |
| 1582 | } |
| 1583 | |
| 1584 | qdict_put_str(options, "server.type", "inet"); |
| 1585 | qdict_put_str(options, "server.host", uri_server); |
| 1586 | |
| 1587 | port_str = g_strdup_printf("%d", uri_port > 0 ? uri_port |
| 1588 | : NBD_DEFAULT_PORT); |
| 1589 | qdict_put_str(options, "server.port", port_str); |
| 1590 | g_free(port_str); |
| 1591 | } |
| 1592 | |
| 1593 | return 0; |
| 1594 | } |
| 1595 | |
| 1596 | static bool nbd_has_filename_options_conflict(QDict *options, Error **errp) |
| 1597 | { |
| 1598 | const QDictEntry *e; |
| 1599 | |
| 1600 | for (e = qdict_first(options); e; e = qdict_next(options, e)) { |
| 1601 | if (!strcmp(e->key, "host") || |
| 1602 | !strcmp(e->key, "port") || |
| 1603 | !strcmp(e->key, "path") || |
| 1604 | !strcmp(e->key, "export") || |
| 1605 | strstart(e->key, "server.", NULL)) |
| 1606 | { |
| 1607 | error_setg(errp, "Option '%s' cannot be used with a file name", |
| 1608 | e->key); |
| 1609 | return true; |
| 1610 | } |
| 1611 | } |
| 1612 | |
| 1613 | return false; |
| 1614 | } |
| 1615 | |
| 1616 | static void nbd_parse_filename(const char *filename, QDict *options, |
| 1617 | Error **errp) |
| 1618 | { |
| 1619 | g_autofree char *file = NULL; |
| 1620 | char *export_name; |
| 1621 | const char *host_spec; |
| 1622 | const char *unixpath; |
| 1623 | |
| 1624 | if (nbd_has_filename_options_conflict(options, errp)) { |
| 1625 | return; |
| 1626 | } |
| 1627 | |
| 1628 | if (strstr(filename, "://")) { |
| 1629 | int ret = nbd_parse_uri(filename, options); |
| 1630 | if (ret < 0) { |
| 1631 | error_setg(errp, "No valid URL specified"); |
| 1632 | } |
| 1633 | return; |
| 1634 | } |
| 1635 | |
| 1636 | file = g_strdup(filename); |
| 1637 | |
| 1638 | export_name = strstr(file, EN_OPTSTR); |
| 1639 | if (export_name) { |
| 1640 | if (export_name[strlen(EN_OPTSTR)] == 0) { |
| 1641 | return; |
| 1642 | } |
| 1643 | export_name[0] = 0; /* truncate 'file' */ |
| 1644 | export_name += strlen(EN_OPTSTR); |
| 1645 | |
| 1646 | qdict_put_str(options, "export", export_name); |
| 1647 | } |
| 1648 | |
| 1649 | /* extract the host_spec - fail if it's not nbd:... */ |
| 1650 | if (!strstart(file, "nbd:", &host_spec)) { |
| 1651 | error_setg(errp, "File name string for NBD must start with 'nbd:'"); |
| 1652 | return; |
| 1653 | } |
| 1654 | |
| 1655 | if (!*host_spec) { |
| 1656 | return; |
| 1657 | } |
| 1658 | |
| 1659 | /* are we a UNIX or TCP socket? */ |
| 1660 | if (strstart(host_spec, "unix:", &unixpath)) { |
| 1661 | qdict_put_str(options, "server.type", "unix"); |
| 1662 | qdict_put_str(options, "server.path", unixpath); |
| 1663 | } else { |
| 1664 | InetSocketAddress *addr = g_new(InetSocketAddress, 1); |
| 1665 | |
| 1666 | if (inet_parse(addr, host_spec, errp)) { |
| 1667 | goto out_inet; |
| 1668 | } |
| 1669 | |
| 1670 | qdict_put_str(options, "server.type", "inet"); |
| 1671 | qdict_put_str(options, "server.host", addr->host); |
| 1672 | qdict_put_str(options, "server.port", addr->port); |
| 1673 | out_inet: |
| 1674 | qapi_free_InetSocketAddress(addr); |
| 1675 | } |
| 1676 | } |
| 1677 | |
| 1678 | static bool nbd_process_legacy_socket_options(QDict *output_options, |
| 1679 | QemuOpts *legacy_opts, |
| 1680 | Error **errp) |
| 1681 | { |
| 1682 | const char *path = qemu_opt_get(legacy_opts, "path"); |
| 1683 | const char *host = qemu_opt_get(legacy_opts, "host"); |
| 1684 | const char *port = qemu_opt_get(legacy_opts, "port"); |
| 1685 | const QDictEntry *e; |
| 1686 | |
| 1687 | if (!path && !host && !port) { |
| 1688 | return true; |
| 1689 | } |
| 1690 | |
| 1691 | for (e = qdict_first(output_options); e; e = qdict_next(output_options, e)) |
| 1692 | { |
| 1693 | if (strstart(e->key, "server.", NULL)) { |
| 1694 | error_setg(errp, "Cannot use 'server' and path/host/port at the " |
| 1695 | "same time"); |
| 1696 | return false; |
| 1697 | } |
| 1698 | } |
| 1699 | |
| 1700 | if (path && host) { |
| 1701 | error_setg(errp, "path and host may not be used at the same time"); |
| 1702 | return false; |
| 1703 | } else if (path) { |
| 1704 | if (port) { |
| 1705 | error_setg(errp, "port may not be used without host"); |
| 1706 | return false; |
| 1707 | } |
| 1708 | |
| 1709 | qdict_put_str(output_options, "server.type", "unix"); |
| 1710 | qdict_put_str(output_options, "server.path", path); |
| 1711 | } else if (host) { |
| 1712 | qdict_put_str(output_options, "server.type", "inet"); |
| 1713 | qdict_put_str(output_options, "server.host", host); |
| 1714 | qdict_put_str(output_options, "server.port", |
| 1715 | port ?: stringify(NBD_DEFAULT_PORT)); |
| 1716 | } |
| 1717 | |
| 1718 | return true; |
| 1719 | } |
| 1720 | |
| 1721 | static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options, |
| 1722 | Error **errp) |
| 1723 | { |
| 1724 | SocketAddress *saddr = NULL; |
| 1725 | QDict *addr = NULL; |
| 1726 | Visitor *iv = NULL; |
| 1727 | |
| 1728 | qdict_extract_subqdict(options, &addr, "server."); |
| 1729 | if (!qdict_size(addr)) { |
| 1730 | error_setg(errp, "NBD server address missing"); |
| 1731 | goto done; |
| 1732 | } |
| 1733 | |
| 1734 | iv = qobject_input_visitor_new_flat_confused(addr, errp); |
| 1735 | if (!iv) { |
| 1736 | goto done; |
| 1737 | } |
| 1738 | |
| 1739 | if (!visit_type_SocketAddress(iv, NULL, &saddr, errp)) { |
| 1740 | goto done; |
| 1741 | } |
| 1742 | |
| 1743 | if (socket_address_parse_named_fd(saddr, errp) < 0) { |
| 1744 | qapi_free_SocketAddress(saddr); |
| 1745 | saddr = NULL; |
| 1746 | goto done; |
| 1747 | } |
| 1748 | |
| 1749 | done: |
| 1750 | qobject_unref(addr); |
| 1751 | visit_free(iv); |
| 1752 | return saddr; |
| 1753 | } |
| 1754 | |
| 1755 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) |
| 1756 | { |
| 1757 | Object *obj; |
| 1758 | QCryptoTLSCreds *creds; |
| 1759 | |
| 1760 | obj = object_resolve_path_component( |
| 1761 | object_get_objects_root(), id); |
| 1762 | if (!obj) { |
| 1763 | error_setg(errp, "No TLS credentials with id '%s'", |
| 1764 | id); |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | creds = (QCryptoTLSCreds *) |
| 1768 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); |
| 1769 | if (!creds) { |
| 1770 | error_setg(errp, "Object with id '%s' is not TLS credentials", |
| 1771 | id); |
| 1772 | return NULL; |
| 1773 | } |
| 1774 | |
| 1775 | if (!qcrypto_tls_creds_check_endpoint(creds, |
| 1776 | QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, |
| 1777 | errp)) { |
| 1778 | return NULL; |
| 1779 | } |
| 1780 | object_ref(obj); |
| 1781 | return creds; |
| 1782 | } |
| 1783 | |
| 1784 | |
| 1785 | static QemuOptsList nbd_runtime_opts = { |
| 1786 | .name = "nbd", |
| 1787 | .head = QTAILQ_HEAD_INITIALIZER(nbd_runtime_opts.head), |
| 1788 | .desc = { |
| 1789 | { |
| 1790 | .name = "host", |
| 1791 | .type = QEMU_OPT_STRING, |
| 1792 | .help = "TCP host to connect to", |
| 1793 | }, |
| 1794 | { |
| 1795 | .name = "port", |
| 1796 | .type = QEMU_OPT_STRING, |
| 1797 | .help = "TCP port to connect to", |
| 1798 | }, |
| 1799 | { |
| 1800 | .name = "path", |
| 1801 | .type = QEMU_OPT_STRING, |
| 1802 | .help = "Unix socket path to connect to", |
| 1803 | }, |
| 1804 | { |
| 1805 | .name = "export", |
| 1806 | .type = QEMU_OPT_STRING, |
| 1807 | .help = "Name of the NBD export to open", |
| 1808 | }, |
| 1809 | { |
| 1810 | .name = "tls-creds", |
| 1811 | .type = QEMU_OPT_STRING, |
| 1812 | .help = "ID of the TLS credentials to use", |
| 1813 | }, |
| 1814 | { |
| 1815 | .name = "tls-hostname", |
| 1816 | .type = QEMU_OPT_STRING, |
| 1817 | .help = "Override hostname for validating TLS x509 certificate", |
| 1818 | }, |
| 1819 | { |
| 1820 | .name = "x-dirty-bitmap", |
| 1821 | .type = QEMU_OPT_STRING, |
| 1822 | .help = "experimental: expose named dirty bitmap in place of " |
| 1823 | "block status", |
| 1824 | }, |
| 1825 | { |
| 1826 | .name = "reconnect-delay", |
| 1827 | .type = QEMU_OPT_NUMBER, |
| 1828 | .help = "On an unexpected disconnect, the nbd client tries to " |
| 1829 | "connect again until succeeding or encountering a serious " |
| 1830 | "error. During the first @reconnect-delay seconds, all " |
| 1831 | "requests are paused and will be rerun on a successful " |
| 1832 | "reconnect. After that time, any delayed requests and all " |
| 1833 | "future requests before a successful reconnect will " |
| 1834 | "immediately fail. Default 0", |
| 1835 | }, |
| 1836 | { |
| 1837 | .name = "open-timeout", |
| 1838 | .type = QEMU_OPT_NUMBER, |
| 1839 | .help = "In seconds. If zero, the nbd driver tries the connection " |
| 1840 | "only once, and fails to open if the connection fails. " |
| 1841 | "If non-zero, the nbd driver will repeat connection " |
| 1842 | "attempts until successful or until @open-timeout seconds " |
| 1843 | "have elapsed. Default 0", |
| 1844 | }, |
| 1845 | { /* end of list */ } |
| 1846 | }, |
| 1847 | }; |
| 1848 | |
| 1849 | static int nbd_process_options(BlockDriverState *bs, QDict *options, |
| 1850 | Error **errp) |
| 1851 | { |
| 1852 | BDRVNBDState *s = bs->opaque; |
| 1853 | QemuOpts *opts; |
| 1854 | int ret = -EINVAL; |
| 1855 | |
| 1856 | opts = qemu_opts_create(&nbd_runtime_opts, NULL, 0, &error_abort); |
| 1857 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| 1858 | goto error; |
| 1859 | } |
| 1860 | |
| 1861 | /* Translate @host, @port, and @path to a SocketAddress */ |
| 1862 | if (!nbd_process_legacy_socket_options(options, opts, errp)) { |
| 1863 | goto error; |
| 1864 | } |
| 1865 | |
| 1866 | /* Pop the config into our state object. Exit if invalid. */ |
| 1867 | s->saddr = nbd_config(s, options, errp); |
| 1868 | if (!s->saddr) { |
| 1869 | goto error; |
| 1870 | } |
| 1871 | |
| 1872 | s->export = g_strdup(qemu_opt_get(opts, "export")); |
| 1873 | if (s->export && strlen(s->export) > NBD_MAX_STRING_SIZE) { |
| 1874 | error_setg(errp, "export name too long to send to server"); |
| 1875 | goto error; |
| 1876 | } |
| 1877 | |
| 1878 | s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds")); |
| 1879 | if (s->tlscredsid) { |
| 1880 | s->tlscreds = nbd_get_tls_creds(s->tlscredsid, errp); |
| 1881 | if (!s->tlscreds) { |
| 1882 | goto error; |
| 1883 | } |
| 1884 | |
| 1885 | s->tlshostname = g_strdup(qemu_opt_get(opts, "tls-hostname")); |
| 1886 | if (!s->tlshostname && |
| 1887 | s->saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
| 1888 | s->tlshostname = g_strdup(s->saddr->u.inet.host); |
| 1889 | } |
| 1890 | } |
| 1891 | |
| 1892 | s->x_dirty_bitmap = g_strdup(qemu_opt_get(opts, "x-dirty-bitmap")); |
| 1893 | if (s->x_dirty_bitmap && strlen(s->x_dirty_bitmap) > NBD_MAX_STRING_SIZE) { |
| 1894 | error_setg(errp, "x-dirty-bitmap query too long to send to server"); |
| 1895 | goto error; |
| 1896 | } |
| 1897 | |
| 1898 | s->reconnect_delay = qemu_opt_get_number(opts, "reconnect-delay", 0); |
| 1899 | s->open_timeout = qemu_opt_get_number(opts, "open-timeout", 0); |
| 1900 | |
| 1901 | ret = 0; |
| 1902 | |
| 1903 | error: |
| 1904 | qemu_opts_del(opts); |
| 1905 | return ret; |
| 1906 | } |
| 1907 | |
| 1908 | static int nbd_open(BlockDriverState *bs, QDict *options, int flags, |
| 1909 | Error **errp) |
| 1910 | { |
| 1911 | int ret; |
| 1912 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1913 | |
| 1914 | s->bs = bs; |
| 1915 | qemu_mutex_init(&s->requests_lock); |
| 1916 | qemu_co_queue_init(&s->free_sema); |
| 1917 | qemu_co_mutex_init(&s->send_mutex); |
| 1918 | qemu_co_mutex_init(&s->receive_mutex); |
| 1919 | |
| 1920 | if (!yank_register_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name), errp)) { |
| 1921 | return -EEXIST; |
| 1922 | } |
| 1923 | |
| 1924 | ret = nbd_process_options(bs, options, errp); |
| 1925 | if (ret < 0) { |
| 1926 | goto fail; |
| 1927 | } |
| 1928 | |
| 1929 | s->conn = nbd_client_connection_new(s->saddr, true, s->export, |
| 1930 | s->x_dirty_bitmap, s->tlscreds, |
| 1931 | s->tlshostname); |
| 1932 | |
| 1933 | if (s->open_timeout) { |
| 1934 | nbd_client_connection_enable_retry(s->conn); |
| 1935 | open_timer_init(s, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + |
| 1936 | s->open_timeout * NANOSECONDS_PER_SECOND); |
| 1937 | } |
| 1938 | |
| 1939 | s->state = NBD_CLIENT_CONNECTING_WAIT; |
| 1940 | ret = nbd_do_establish_connection(bs, true, errp); |
| 1941 | if (ret < 0) { |
| 1942 | goto fail; |
| 1943 | } |
| 1944 | |
| 1945 | /* |
| 1946 | * The connect attempt is done, so we no longer need this timer. |
| 1947 | * Delete it, because we do not want it to be around when this node |
| 1948 | * is drained or closed. |
| 1949 | */ |
| 1950 | open_timer_del(s); |
| 1951 | |
| 1952 | nbd_client_connection_enable_retry(s->conn); |
| 1953 | |
| 1954 | return 0; |
| 1955 | |
| 1956 | fail: |
| 1957 | open_timer_del(s); |
| 1958 | nbd_clear_bdrvstate(bs); |
| 1959 | return ret; |
| 1960 | } |
| 1961 | |
| 1962 | static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) |
| 1963 | { |
| 1964 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 1965 | uint32_t min = s->info.min_block; |
| 1966 | uint32_t max = MIN_NON_ZERO(NBD_MAX_BUFFER_SIZE, s->info.max_block); |
| 1967 | |
| 1968 | /* |
| 1969 | * If the server did not advertise an alignment: |
| 1970 | * - a size that is not sector-aligned implies that an alignment |
| 1971 | * of 1 can be used to access those tail bytes |
| 1972 | * - advertisement of block status requires an alignment of 1, so |
| 1973 | * that we don't violate block layer constraints that block |
| 1974 | * status is always aligned (as we can't control whether the |
| 1975 | * server will report sub-sector extents, such as a hole at EOF |
| 1976 | * on an unaligned POSIX file) |
| 1977 | * - otherwise, assume the server is so old that we are safer avoiding |
| 1978 | * sub-sector requests |
| 1979 | */ |
| 1980 | if (!min) { |
| 1981 | min = (!QEMU_IS_ALIGNED(s->info.size, BDRV_SECTOR_SIZE) || |
| 1982 | s->info.base_allocation) ? 1 : BDRV_SECTOR_SIZE; |
| 1983 | } |
| 1984 | |
| 1985 | bs->bl.request_alignment = min; |
| 1986 | bs->bl.max_pdiscard = QEMU_ALIGN_DOWN(INT_MAX, min); |
| 1987 | bs->bl.max_pwrite_zeroes = max; |
| 1988 | bs->bl.max_transfer = max; |
| 1989 | |
| 1990 | /* |
| 1991 | * Assume that if the server supports extended headers, it also |
| 1992 | * supports unlimited size zero and trim commands. |
| 1993 | */ |
| 1994 | if (s->info.mode >= NBD_MODE_EXTENDED) { |
| 1995 | bs->bl.max_pdiscard = bs->bl.max_pwrite_zeroes = 0; |
| 1996 | } |
| 1997 | |
| 1998 | if (s->info.opt_block && |
| 1999 | s->info.opt_block > bs->bl.opt_transfer) { |
| 2000 | bs->bl.opt_transfer = s->info.opt_block; |
| 2001 | } |
| 2002 | } |
| 2003 | |
| 2004 | static void nbd_close(BlockDriverState *bs) |
| 2005 | { |
| 2006 | nbd_client_close(bs); |
| 2007 | nbd_clear_bdrvstate(bs); |
| 2008 | } |
| 2009 | |
| 2010 | /* |
| 2011 | * NBD cannot truncate, but if the caller asks to truncate to the same size, or |
| 2012 | * to a smaller size with exact=false, there is no reason to fail the |
| 2013 | * operation. |
| 2014 | * |
| 2015 | * Preallocation mode is ignored since it does not seems useful to fail when |
| 2016 | * we never change anything. |
| 2017 | */ |
| 2018 | static int coroutine_fn nbd_co_truncate(BlockDriverState *bs, int64_t offset, |
| 2019 | bool exact, PreallocMode prealloc, |
| 2020 | BdrvRequestFlags flags, Error **errp) |
| 2021 | { |
| 2022 | BDRVNBDState *s = bs->opaque; |
| 2023 | |
| 2024 | if (offset != s->info.size && exact) { |
| 2025 | error_setg(errp, "Cannot resize NBD nodes"); |
| 2026 | return -ENOTSUP; |
| 2027 | } |
| 2028 | |
| 2029 | if (offset > s->info.size) { |
| 2030 | error_setg(errp, "Cannot grow NBD nodes"); |
| 2031 | return -EINVAL; |
| 2032 | } |
| 2033 | |
| 2034 | return 0; |
| 2035 | } |
| 2036 | |
| 2037 | static int64_t coroutine_fn nbd_co_getlength(BlockDriverState *bs) |
| 2038 | { |
| 2039 | BDRVNBDState *s = bs->opaque; |
| 2040 | |
| 2041 | return s->info.size; |
| 2042 | } |
| 2043 | |
| 2044 | static void nbd_refresh_filename(BlockDriverState *bs) |
| 2045 | { |
| 2046 | BDRVNBDState *s = bs->opaque; |
| 2047 | const char *host = NULL, *port = NULL, *path = NULL; |
| 2048 | size_t len = 0; |
| 2049 | |
| 2050 | if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
| 2051 | const InetSocketAddress *inet = &s->saddr->u.inet; |
| 2052 | if (!inet->has_ipv4 && !inet->has_ipv6 && !inet->has_to) { |
| 2053 | host = inet->host; |
| 2054 | port = inet->port; |
| 2055 | } |
| 2056 | } else if (s->saddr->type == SOCKET_ADDRESS_TYPE_UNIX) { |
| 2057 | path = s->saddr->u.q_unix.path; |
| 2058 | } /* else can't represent as pseudo-filename */ |
| 2059 | |
| 2060 | if (path && s->export) { |
| 2061 | len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| 2062 | "nbd+unix:///%s?socket=%s", s->export, path); |
| 2063 | } else if (path && !s->export) { |
| 2064 | len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| 2065 | "nbd+unix://?socket=%s", path); |
| 2066 | } else if (host && s->export) { |
| 2067 | len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| 2068 | "nbd://%s:%s/%s", host, port, s->export); |
| 2069 | } else if (host && !s->export) { |
| 2070 | len = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| 2071 | "nbd://%s:%s", host, port); |
| 2072 | } |
| 2073 | if (len >= sizeof(bs->exact_filename)) { |
| 2074 | /* Name is too long to represent exactly, so leave it empty. */ |
| 2075 | bs->exact_filename[0] = '\0'; |
| 2076 | } |
| 2077 | } |
| 2078 | |
| 2079 | static char *nbd_dirname(BlockDriverState *bs, Error **errp) |
| 2080 | { |
| 2081 | /* The generic bdrv_dirname() implementation is able to work out some |
| 2082 | * directory name for NBD nodes, but that would be wrong. So far there is no |
| 2083 | * specification for how "export paths" would work, so NBD does not have |
| 2084 | * directory names. */ |
| 2085 | error_setg(errp, "Cannot generate a base directory for NBD nodes"); |
| 2086 | return NULL; |
| 2087 | } |
| 2088 | |
| 2089 | static const char *const nbd_strong_runtime_opts[] = { |
| 2090 | "path", |
| 2091 | "host", |
| 2092 | "port", |
| 2093 | "export", |
| 2094 | "tls-creds", |
| 2095 | "tls-hostname", |
| 2096 | "server.", |
| 2097 | |
| 2098 | NULL |
| 2099 | }; |
| 2100 | |
| 2101 | static void nbd_cancel_in_flight(BlockDriverState *bs) |
| 2102 | { |
| 2103 | BDRVNBDState *s = (BDRVNBDState *)bs->opaque; |
| 2104 | |
| 2105 | reconnect_delay_timer_del(s); |
| 2106 | |
| 2107 | qemu_mutex_lock(&s->requests_lock); |
| 2108 | if (s->state == NBD_CLIENT_CONNECTING_WAIT) { |
| 2109 | s->state = NBD_CLIENT_CONNECTING_NOWAIT; |
| 2110 | } |
| 2111 | qemu_mutex_unlock(&s->requests_lock); |
| 2112 | |
| 2113 | nbd_co_establish_connection_cancel(s->conn); |
| 2114 | } |
| 2115 | |
| 2116 | static void nbd_attach_aio_context(BlockDriverState *bs, |
| 2117 | AioContext *new_context) |
| 2118 | { |
| 2119 | BDRVNBDState *s = bs->opaque; |
| 2120 | |
| 2121 | /* The open_timer is used only during nbd_open() */ |
| 2122 | assert(!s->open_timer); |
| 2123 | |
| 2124 | /* |
| 2125 | * The reconnect_delay_timer is scheduled in I/O paths when the |
| 2126 | * connection is lost, to cancel the reconnection attempt after a |
| 2127 | * given time. Once this attempt is done (successfully or not), |
| 2128 | * nbd_reconnect_attempt() ensures the timer is deleted before the |
| 2129 | * respective I/O request is resumed. |
| 2130 | * Since the AioContext can only be changed when a node is drained, |
| 2131 | * the reconnect_delay_timer cannot be active here. |
| 2132 | */ |
| 2133 | assert(!s->reconnect_delay_timer); |
| 2134 | } |
| 2135 | |
| 2136 | static void nbd_detach_aio_context(BlockDriverState *bs) |
| 2137 | { |
| 2138 | BDRVNBDState *s = bs->opaque; |
| 2139 | |
| 2140 | assert(!s->open_timer); |
| 2141 | assert(!s->reconnect_delay_timer); |
| 2142 | } |
| 2143 | |
| 2144 | static BlockDriver bdrv_nbd = { |
| 2145 | .format_name = "nbd", |
| 2146 | .protocol_name = "nbd", |
| 2147 | .instance_size = sizeof(BDRVNBDState), |
| 2148 | .bdrv_parse_filename = nbd_parse_filename, |
| 2149 | .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| 2150 | .create_opts = &bdrv_create_opts_simple, |
| 2151 | .bdrv_open = nbd_open, |
| 2152 | .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| 2153 | .bdrv_co_preadv = nbd_client_co_preadv, |
| 2154 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
| 2155 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| 2156 | .bdrv_close = nbd_close, |
| 2157 | .bdrv_co_flush_to_os = nbd_client_co_flush, |
| 2158 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| 2159 | .bdrv_refresh_limits = nbd_refresh_limits, |
| 2160 | .bdrv_co_truncate = nbd_co_truncate, |
| 2161 | .bdrv_co_getlength = nbd_co_getlength, |
| 2162 | .bdrv_refresh_filename = nbd_refresh_filename, |
| 2163 | .bdrv_co_block_status = nbd_client_co_block_status, |
| 2164 | .bdrv_dirname = nbd_dirname, |
| 2165 | .strong_runtime_opts = nbd_strong_runtime_opts, |
| 2166 | .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| 2167 | |
| 2168 | .bdrv_attach_aio_context = nbd_attach_aio_context, |
| 2169 | .bdrv_detach_aio_context = nbd_detach_aio_context, |
| 2170 | }; |
| 2171 | |
| 2172 | static BlockDriver bdrv_nbd_tcp = { |
| 2173 | .format_name = "nbd", |
| 2174 | .protocol_name = "nbd+tcp", |
| 2175 | .instance_size = sizeof(BDRVNBDState), |
| 2176 | .bdrv_parse_filename = nbd_parse_filename, |
| 2177 | .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| 2178 | .create_opts = &bdrv_create_opts_simple, |
| 2179 | .bdrv_open = nbd_open, |
| 2180 | .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| 2181 | .bdrv_co_preadv = nbd_client_co_preadv, |
| 2182 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
| 2183 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| 2184 | .bdrv_close = nbd_close, |
| 2185 | .bdrv_co_flush_to_os = nbd_client_co_flush, |
| 2186 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| 2187 | .bdrv_refresh_limits = nbd_refresh_limits, |
| 2188 | .bdrv_co_truncate = nbd_co_truncate, |
| 2189 | .bdrv_co_getlength = nbd_co_getlength, |
| 2190 | .bdrv_refresh_filename = nbd_refresh_filename, |
| 2191 | .bdrv_co_block_status = nbd_client_co_block_status, |
| 2192 | .bdrv_dirname = nbd_dirname, |
| 2193 | .strong_runtime_opts = nbd_strong_runtime_opts, |
| 2194 | .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| 2195 | |
| 2196 | .bdrv_attach_aio_context = nbd_attach_aio_context, |
| 2197 | .bdrv_detach_aio_context = nbd_detach_aio_context, |
| 2198 | }; |
| 2199 | |
| 2200 | static BlockDriver bdrv_nbd_unix = { |
| 2201 | .format_name = "nbd", |
| 2202 | .protocol_name = "nbd+unix", |
| 2203 | .instance_size = sizeof(BDRVNBDState), |
| 2204 | .bdrv_parse_filename = nbd_parse_filename, |
| 2205 | .bdrv_co_create_opts = bdrv_co_create_opts_simple, |
| 2206 | .create_opts = &bdrv_create_opts_simple, |
| 2207 | .bdrv_open = nbd_open, |
| 2208 | .bdrv_reopen_prepare = nbd_client_reopen_prepare, |
| 2209 | .bdrv_co_preadv = nbd_client_co_preadv, |
| 2210 | .bdrv_co_pwritev = nbd_client_co_pwritev, |
| 2211 | .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| 2212 | .bdrv_close = nbd_close, |
| 2213 | .bdrv_co_flush_to_os = nbd_client_co_flush, |
| 2214 | .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| 2215 | .bdrv_refresh_limits = nbd_refresh_limits, |
| 2216 | .bdrv_co_truncate = nbd_co_truncate, |
| 2217 | .bdrv_co_getlength = nbd_co_getlength, |
| 2218 | .bdrv_refresh_filename = nbd_refresh_filename, |
| 2219 | .bdrv_co_block_status = nbd_client_co_block_status, |
| 2220 | .bdrv_dirname = nbd_dirname, |
| 2221 | .strong_runtime_opts = nbd_strong_runtime_opts, |
| 2222 | .bdrv_cancel_in_flight = nbd_cancel_in_flight, |
| 2223 | |
| 2224 | .bdrv_attach_aio_context = nbd_attach_aio_context, |
| 2225 | .bdrv_detach_aio_context = nbd_detach_aio_context, |
| 2226 | }; |
| 2227 | |
| 2228 | static void bdrv_nbd_init(void) |
| 2229 | { |
| 2230 | bdrv_register(&bdrv_nbd); |
| 2231 | bdrv_register(&bdrv_nbd_tcp); |
| 2232 | bdrv_register(&bdrv_nbd_unix); |
| 2233 | } |
| 2234 | |
| 2235 | block_init(bdrv_nbd_init); |