1 /* 2 * Replication Block filter 3 * 4 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 5 * Copyright (c) 2016 Intel Corporation 6 * Copyright (c) 2016 FUJITSU LIMITED 7 * 8 * Author: 9 * Wen Congyang <wency@cn.fujitsu.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or later. 12 * See the COPYING file in the top-level directory. 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu/module.h" 17 #include "qemu/option.h" 18 #include "block/nbd.h" 19 #include "block/blockjob.h" 20 #include "block/block_int.h" 21 #include "block/block_backup.h" 22 #include "sysemu/block-backend.h" 23 #include "qapi/error.h" 24 #include "qapi/qmp/qdict.h" 25 #include "block/replication.h" 26 27 typedef enum { 28 BLOCK_REPLICATION_NONE, /* block replication is not started */ 29 BLOCK_REPLICATION_RUNNING, /* block replication is running */ 30 BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ 31 BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ 32 BLOCK_REPLICATION_DONE, /* block replication is done */ 33 } ReplicationStage; 34 35 typedef struct BDRVReplicationState { 36 ReplicationMode mode; 37 ReplicationStage stage; 38 BlockJob *commit_job; 39 BdrvChild *hidden_disk; 40 BdrvChild *secondary_disk; 41 BlockJob *backup_job; 42 char *top_id; 43 ReplicationState *rs; 44 Error *blocker; 45 bool orig_hidden_read_only; 46 bool orig_secondary_read_only; 47 int error; 48 } BDRVReplicationState; 49 50 static void replication_start(ReplicationState *rs, ReplicationMode mode, 51 Error **errp); 52 static void replication_do_checkpoint(ReplicationState *rs, Error **errp); 53 static void replication_get_error(ReplicationState *rs, Error **errp); 54 static void replication_stop(ReplicationState *rs, bool failover, 55 Error **errp); 56 57 #define REPLICATION_MODE "mode" 58 #define REPLICATION_TOP_ID "top-id" 59 static QemuOptsList replication_runtime_opts = { 60 .name = "replication", 61 .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), 62 .desc = { 63 { 64 .name = REPLICATION_MODE, 65 .type = QEMU_OPT_STRING, 66 }, 67 { 68 .name = REPLICATION_TOP_ID, 69 .type = QEMU_OPT_STRING, 70 }, 71 { /* end of list */ } 72 }, 73 }; 74 75 static ReplicationOps replication_ops = { 76 .start = replication_start, 77 .checkpoint = replication_do_checkpoint, 78 .get_error = replication_get_error, 79 .stop = replication_stop, 80 }; 81 82 static int replication_open(BlockDriverState *bs, QDict *options, 83 int flags, Error **errp) 84 { 85 int ret; 86 BDRVReplicationState *s = bs->opaque; 87 QemuOpts *opts = NULL; 88 const char *mode; 89 const char *top_id; 90 91 ret = bdrv_open_file_child(NULL, options, "file", bs, errp); 92 if (ret < 0) { 93 return ret; 94 } 95 96 ret = -EINVAL; 97 opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); 98 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 99 goto fail; 100 } 101 102 mode = qemu_opt_get(opts, REPLICATION_MODE); 103 if (!mode) { 104 error_setg(errp, "Missing the option mode"); 105 goto fail; 106 } 107 108 if (!strcmp(mode, "primary")) { 109 s->mode = REPLICATION_MODE_PRIMARY; 110 top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 111 if (top_id) { 112 error_setg(errp, 113 "The primary side does not support option top-id"); 114 goto fail; 115 } 116 } else if (!strcmp(mode, "secondary")) { 117 s->mode = REPLICATION_MODE_SECONDARY; 118 top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 119 s->top_id = g_strdup(top_id); 120 if (!s->top_id) { 121 error_setg(errp, "Missing the option top-id"); 122 goto fail; 123 } 124 } else { 125 error_setg(errp, 126 "The option mode's value should be primary or secondary"); 127 goto fail; 128 } 129 130 s->rs = replication_new(bs, &replication_ops); 131 132 ret = 0; 133 134 fail: 135 qemu_opts_del(opts); 136 return ret; 137 } 138 139 static void replication_close(BlockDriverState *bs) 140 { 141 BDRVReplicationState *s = bs->opaque; 142 Job *commit_job; 143 GLOBAL_STATE_CODE(); 144 145 if (s->stage == BLOCK_REPLICATION_RUNNING) { 146 replication_stop(s->rs, false, NULL); 147 } 148 if (s->stage == BLOCK_REPLICATION_FAILOVER) { 149 commit_job = &s->commit_job->job; 150 assert(commit_job->aio_context == qemu_get_current_aio_context()); 151 job_cancel_sync(commit_job, false); 152 } 153 154 if (s->mode == REPLICATION_MODE_SECONDARY) { 155 g_free(s->top_id); 156 } 157 158 replication_remove(s->rs); 159 } 160 161 static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 162 BdrvChildRole role, 163 BlockReopenQueue *reopen_queue, 164 uint64_t perm, uint64_t shared, 165 uint64_t *nperm, uint64_t *nshared) 166 { 167 if (role & BDRV_CHILD_PRIMARY) { 168 *nperm = BLK_PERM_CONSISTENT_READ; 169 } else { 170 *nperm = 0; 171 } 172 173 if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { 174 *nperm |= BLK_PERM_WRITE; 175 } 176 *nshared = BLK_PERM_CONSISTENT_READ 177 | BLK_PERM_WRITE 178 | BLK_PERM_WRITE_UNCHANGED; 179 return; 180 } 181 182 static int64_t coroutine_fn GRAPH_RDLOCK 183 replication_co_getlength(BlockDriverState *bs) 184 { 185 return bdrv_co_getlength(bs->file->bs); 186 } 187 188 static int replication_get_io_status(BDRVReplicationState *s) 189 { 190 switch (s->stage) { 191 case BLOCK_REPLICATION_NONE: 192 return -EIO; 193 case BLOCK_REPLICATION_RUNNING: 194 return 0; 195 case BLOCK_REPLICATION_FAILOVER: 196 return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 197 case BLOCK_REPLICATION_FAILOVER_FAILED: 198 return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; 199 case BLOCK_REPLICATION_DONE: 200 /* 201 * active commit job completes, and active disk and secondary_disk 202 * is swapped, so we can operate bs->file directly 203 */ 204 return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 205 default: 206 abort(); 207 } 208 } 209 210 static int replication_return_value(BDRVReplicationState *s, int ret) 211 { 212 if (s->mode == REPLICATION_MODE_SECONDARY) { 213 return ret; 214 } 215 216 if (ret < 0) { 217 s->error = ret; 218 ret = 0; 219 } 220 221 return ret; 222 } 223 224 static int coroutine_fn GRAPH_RDLOCK 225 replication_co_readv(BlockDriverState *bs, int64_t sector_num, 226 int remaining_sectors, QEMUIOVector *qiov) 227 { 228 BDRVReplicationState *s = bs->opaque; 229 int ret; 230 231 if (s->mode == REPLICATION_MODE_PRIMARY) { 232 /* We only use it to forward primary write requests */ 233 return -EIO; 234 } 235 236 ret = replication_get_io_status(s); 237 if (ret < 0) { 238 return ret; 239 } 240 241 ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, 242 remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 243 244 return replication_return_value(s, ret); 245 } 246 247 static int coroutine_fn GRAPH_RDLOCK 248 replication_co_writev(BlockDriverState *bs, int64_t sector_num, 249 int remaining_sectors, QEMUIOVector *qiov, int flags) 250 { 251 BDRVReplicationState *s = bs->opaque; 252 QEMUIOVector hd_qiov; 253 uint64_t bytes_done = 0; 254 BdrvChild *top = bs->file; 255 BdrvChild *base = s->secondary_disk; 256 BdrvChild *target; 257 int ret; 258 int64_t n; 259 260 ret = replication_get_io_status(s); 261 if (ret < 0) { 262 goto out; 263 } 264 265 if (ret == 0) { 266 ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, 267 remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 268 return replication_return_value(s, ret); 269 } 270 271 /* 272 * Failover failed, only write to active disk if the sectors 273 * have already been allocated in active disk/hidden disk. 274 */ 275 qemu_iovec_init(&hd_qiov, qiov->niov); 276 while (remaining_sectors > 0) { 277 int64_t count; 278 279 ret = bdrv_is_allocated_above(top->bs, base->bs, false, 280 sector_num * BDRV_SECTOR_SIZE, 281 remaining_sectors * BDRV_SECTOR_SIZE, 282 &count); 283 if (ret < 0) { 284 goto out1; 285 } 286 287 assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); 288 n = count >> BDRV_SECTOR_BITS; 289 qemu_iovec_reset(&hd_qiov); 290 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); 291 292 target = ret ? top : base; 293 ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, 294 n * BDRV_SECTOR_SIZE, &hd_qiov, 0); 295 if (ret < 0) { 296 goto out1; 297 } 298 299 remaining_sectors -= n; 300 sector_num += n; 301 bytes_done += count; 302 } 303 304 out1: 305 qemu_iovec_destroy(&hd_qiov); 306 out: 307 return ret; 308 } 309 310 static void secondary_do_checkpoint(BlockDriverState *bs, Error **errp) 311 { 312 BDRVReplicationState *s = bs->opaque; 313 BdrvChild *active_disk = bs->file; 314 Error *local_err = NULL; 315 int ret; 316 317 if (!s->backup_job) { 318 error_setg(errp, "Backup job was cancelled unexpectedly"); 319 return; 320 } 321 322 backup_do_checkpoint(s->backup_job, &local_err); 323 if (local_err) { 324 error_propagate(errp, local_err); 325 return; 326 } 327 328 if (!active_disk->bs->drv) { 329 error_setg(errp, "Active disk %s is ejected", 330 active_disk->bs->node_name); 331 return; 332 } 333 334 ret = bdrv_make_empty(active_disk, errp); 335 if (ret < 0) { 336 return; 337 } 338 339 if (!s->hidden_disk->bs->drv) { 340 error_setg(errp, "Hidden disk %s is ejected", 341 s->hidden_disk->bs->node_name); 342 return; 343 } 344 345 ret = bdrv_make_empty(s->hidden_disk, errp); 346 if (ret < 0) { 347 return; 348 } 349 } 350 351 /* This function is supposed to be called twice: 352 * first with writable = true, then with writable = false. 353 * The first call puts s->hidden_disk and s->secondary_disk in 354 * r/w mode, and the second puts them back in their original state. 355 */ 356 static void reopen_backing_file(BlockDriverState *bs, bool writable, 357 Error **errp) 358 { 359 BDRVReplicationState *s = bs->opaque; 360 BdrvChild *hidden_disk, *secondary_disk; 361 BlockReopenQueue *reopen_queue = NULL; 362 363 /* 364 * s->hidden_disk and s->secondary_disk may not be set yet, as they will 365 * only be set after the children are writable. 366 */ 367 hidden_disk = bs->file->bs->backing; 368 secondary_disk = hidden_disk->bs->backing; 369 370 if (writable) { 371 s->orig_hidden_read_only = bdrv_is_read_only(hidden_disk->bs); 372 s->orig_secondary_read_only = bdrv_is_read_only(secondary_disk->bs); 373 } 374 375 if (s->orig_hidden_read_only) { 376 QDict *opts = qdict_new(); 377 qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 378 reopen_queue = bdrv_reopen_queue(reopen_queue, hidden_disk->bs, 379 opts, true); 380 } 381 382 if (s->orig_secondary_read_only) { 383 QDict *opts = qdict_new(); 384 qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 385 reopen_queue = bdrv_reopen_queue(reopen_queue, secondary_disk->bs, 386 opts, true); 387 } 388 389 if (reopen_queue) { 390 AioContext *ctx = bdrv_get_aio_context(bs); 391 if (ctx != qemu_get_aio_context()) { 392 aio_context_release(ctx); 393 } 394 bdrv_reopen_multiple(reopen_queue, errp); 395 if (ctx != qemu_get_aio_context()) { 396 aio_context_acquire(ctx); 397 } 398 } 399 } 400 401 static void backup_job_cleanup(BlockDriverState *bs) 402 { 403 BDRVReplicationState *s = bs->opaque; 404 BlockDriverState *top_bs; 405 406 s->backup_job = NULL; 407 408 top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 409 if (!top_bs) { 410 return; 411 } 412 bdrv_op_unblock_all(top_bs, s->blocker); 413 error_free(s->blocker); 414 reopen_backing_file(bs, false, NULL); 415 } 416 417 static void backup_job_completed(void *opaque, int ret) 418 { 419 BlockDriverState *bs = opaque; 420 BDRVReplicationState *s = bs->opaque; 421 422 if (s->stage != BLOCK_REPLICATION_FAILOVER) { 423 /* The backup job is cancelled unexpectedly */ 424 s->error = -EIO; 425 } 426 427 backup_job_cleanup(bs); 428 } 429 430 static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 431 { 432 BdrvChild *child; 433 434 /* The bs itself is the top_bs */ 435 if (top_bs == bs) { 436 return true; 437 } 438 439 /* Iterate over top_bs's children */ 440 QLIST_FOREACH(child, &top_bs->children, next) { 441 if (child->bs == bs || check_top_bs(child->bs, bs)) { 442 return true; 443 } 444 } 445 446 return false; 447 } 448 449 static void replication_start(ReplicationState *rs, ReplicationMode mode, 450 Error **errp) 451 { 452 BlockDriverState *bs = rs->opaque; 453 BDRVReplicationState *s; 454 BlockDriverState *top_bs; 455 BdrvChild *active_disk, *hidden_disk, *secondary_disk; 456 int64_t active_length, hidden_length, disk_length; 457 AioContext *aio_context; 458 Error *local_err = NULL; 459 BackupPerf perf = { .use_copy_range = true, .max_workers = 1 }; 460 461 aio_context = bdrv_get_aio_context(bs); 462 aio_context_acquire(aio_context); 463 s = bs->opaque; 464 465 if (s->stage == BLOCK_REPLICATION_DONE || 466 s->stage == BLOCK_REPLICATION_FAILOVER) { 467 /* 468 * This case happens when a secondary is promoted to primary. 469 * Ignore the request because the secondary side of replication 470 * doesn't have to do anything anymore. 471 */ 472 aio_context_release(aio_context); 473 return; 474 } 475 476 if (s->stage != BLOCK_REPLICATION_NONE) { 477 error_setg(errp, "Block replication is running or done"); 478 aio_context_release(aio_context); 479 return; 480 } 481 482 if (s->mode != mode) { 483 error_setg(errp, "The parameter mode's value is invalid, needs %d," 484 " but got %d", s->mode, mode); 485 aio_context_release(aio_context); 486 return; 487 } 488 489 switch (s->mode) { 490 case REPLICATION_MODE_PRIMARY: 491 break; 492 case REPLICATION_MODE_SECONDARY: 493 active_disk = bs->file; 494 if (!active_disk || !active_disk->bs || !active_disk->bs->backing) { 495 error_setg(errp, "Active disk doesn't have backing file"); 496 aio_context_release(aio_context); 497 return; 498 } 499 500 hidden_disk = active_disk->bs->backing; 501 if (!hidden_disk->bs || !hidden_disk->bs->backing) { 502 error_setg(errp, "Hidden disk doesn't have backing file"); 503 aio_context_release(aio_context); 504 return; 505 } 506 507 secondary_disk = hidden_disk->bs->backing; 508 if (!secondary_disk->bs || !bdrv_has_blk(secondary_disk->bs)) { 509 error_setg(errp, "The secondary disk doesn't have block backend"); 510 aio_context_release(aio_context); 511 return; 512 } 513 514 /* verify the length */ 515 active_length = bdrv_getlength(active_disk->bs); 516 hidden_length = bdrv_getlength(hidden_disk->bs); 517 disk_length = bdrv_getlength(secondary_disk->bs); 518 if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 519 active_length != hidden_length || hidden_length != disk_length) { 520 error_setg(errp, "Active disk, hidden disk, secondary disk's length" 521 " are not the same"); 522 aio_context_release(aio_context); 523 return; 524 } 525 526 /* Must be true, or the bdrv_getlength() calls would have failed */ 527 assert(active_disk->bs->drv && hidden_disk->bs->drv); 528 529 if (!active_disk->bs->drv->bdrv_make_empty || 530 !hidden_disk->bs->drv->bdrv_make_empty) { 531 error_setg(errp, 532 "Active disk or hidden disk doesn't support make_empty"); 533 aio_context_release(aio_context); 534 return; 535 } 536 537 /* reopen the backing file in r/w mode */ 538 reopen_backing_file(bs, true, &local_err); 539 if (local_err) { 540 error_propagate(errp, local_err); 541 aio_context_release(aio_context); 542 return; 543 } 544 545 bdrv_graph_wrlock(bs); 546 547 bdrv_ref(hidden_disk->bs); 548 s->hidden_disk = bdrv_attach_child(bs, hidden_disk->bs, "hidden disk", 549 &child_of_bds, BDRV_CHILD_DATA, 550 &local_err); 551 if (local_err) { 552 error_propagate(errp, local_err); 553 bdrv_graph_wrunlock(); 554 aio_context_release(aio_context); 555 return; 556 } 557 558 bdrv_ref(secondary_disk->bs); 559 s->secondary_disk = bdrv_attach_child(bs, secondary_disk->bs, 560 "secondary disk", &child_of_bds, 561 BDRV_CHILD_DATA, &local_err); 562 if (local_err) { 563 error_propagate(errp, local_err); 564 bdrv_graph_wrunlock(); 565 aio_context_release(aio_context); 566 return; 567 } 568 569 bdrv_graph_wrunlock(); 570 571 /* start backup job now */ 572 error_setg(&s->blocker, 573 "Block device is in use by internal backup job"); 574 575 top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 576 if (!top_bs || !bdrv_is_root_node(top_bs) || 577 !check_top_bs(top_bs, bs)) { 578 error_setg(errp, "No top_bs or it is invalid"); 579 reopen_backing_file(bs, false, NULL); 580 aio_context_release(aio_context); 581 return; 582 } 583 bdrv_op_block_all(top_bs, s->blocker); 584 bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 585 586 s->backup_job = backup_job_create( 587 NULL, s->secondary_disk->bs, s->hidden_disk->bs, 588 0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, NULL, 589 &perf, 590 BLOCKDEV_ON_ERROR_REPORT, 591 BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, 592 backup_job_completed, bs, NULL, &local_err); 593 if (local_err) { 594 error_propagate(errp, local_err); 595 backup_job_cleanup(bs); 596 aio_context_release(aio_context); 597 return; 598 } 599 job_start(&s->backup_job->job); 600 break; 601 default: 602 aio_context_release(aio_context); 603 abort(); 604 } 605 606 s->stage = BLOCK_REPLICATION_RUNNING; 607 608 if (s->mode == REPLICATION_MODE_SECONDARY) { 609 secondary_do_checkpoint(bs, errp); 610 } 611 612 s->error = 0; 613 aio_context_release(aio_context); 614 } 615 616 static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 617 { 618 BlockDriverState *bs = rs->opaque; 619 BDRVReplicationState *s; 620 AioContext *aio_context; 621 622 aio_context = bdrv_get_aio_context(bs); 623 aio_context_acquire(aio_context); 624 s = bs->opaque; 625 626 if (s->stage == BLOCK_REPLICATION_DONE || 627 s->stage == BLOCK_REPLICATION_FAILOVER) { 628 /* 629 * This case happens when a secondary was promoted to primary. 630 * Ignore the request because the secondary side of replication 631 * doesn't have to do anything anymore. 632 */ 633 aio_context_release(aio_context); 634 return; 635 } 636 637 if (s->mode == REPLICATION_MODE_SECONDARY) { 638 secondary_do_checkpoint(bs, errp); 639 } 640 aio_context_release(aio_context); 641 } 642 643 static void replication_get_error(ReplicationState *rs, Error **errp) 644 { 645 BlockDriverState *bs = rs->opaque; 646 BDRVReplicationState *s; 647 AioContext *aio_context; 648 649 aio_context = bdrv_get_aio_context(bs); 650 aio_context_acquire(aio_context); 651 s = bs->opaque; 652 653 if (s->stage == BLOCK_REPLICATION_NONE) { 654 error_setg(errp, "Block replication is not running"); 655 aio_context_release(aio_context); 656 return; 657 } 658 659 if (s->error) { 660 error_setg(errp, "I/O error occurred"); 661 aio_context_release(aio_context); 662 return; 663 } 664 aio_context_release(aio_context); 665 } 666 667 static void replication_done(void *opaque, int ret) 668 { 669 BlockDriverState *bs = opaque; 670 BDRVReplicationState *s = bs->opaque; 671 672 if (ret == 0) { 673 s->stage = BLOCK_REPLICATION_DONE; 674 675 bdrv_graph_wrlock(NULL); 676 bdrv_unref_child(bs, s->secondary_disk); 677 s->secondary_disk = NULL; 678 bdrv_unref_child(bs, s->hidden_disk); 679 s->hidden_disk = NULL; 680 bdrv_graph_wrunlock(); 681 682 s->error = 0; 683 } else { 684 s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; 685 s->error = -EIO; 686 } 687 } 688 689 static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 690 { 691 BlockDriverState *bs = rs->opaque; 692 BDRVReplicationState *s; 693 AioContext *aio_context; 694 695 aio_context = bdrv_get_aio_context(bs); 696 aio_context_acquire(aio_context); 697 s = bs->opaque; 698 699 if (s->stage == BLOCK_REPLICATION_DONE || 700 s->stage == BLOCK_REPLICATION_FAILOVER) { 701 /* 702 * This case happens when a secondary was promoted to primary. 703 * Ignore the request because the secondary side of replication 704 * doesn't have to do anything anymore. 705 */ 706 aio_context_release(aio_context); 707 return; 708 } 709 710 if (s->stage != BLOCK_REPLICATION_RUNNING) { 711 error_setg(errp, "Block replication is not running"); 712 aio_context_release(aio_context); 713 return; 714 } 715 716 switch (s->mode) { 717 case REPLICATION_MODE_PRIMARY: 718 s->stage = BLOCK_REPLICATION_DONE; 719 s->error = 0; 720 break; 721 case REPLICATION_MODE_SECONDARY: 722 /* 723 * This BDS will be closed, and the job should be completed 724 * before the BDS is closed, because we will access hidden 725 * disk, secondary disk in backup_job_completed(). 726 */ 727 if (s->backup_job) { 728 aio_context_release(aio_context); 729 job_cancel_sync(&s->backup_job->job, true); 730 aio_context_acquire(aio_context); 731 } 732 733 if (!failover) { 734 secondary_do_checkpoint(bs, errp); 735 s->stage = BLOCK_REPLICATION_DONE; 736 aio_context_release(aio_context); 737 return; 738 } 739 740 s->stage = BLOCK_REPLICATION_FAILOVER; 741 s->commit_job = commit_active_start( 742 NULL, bs->file->bs, s->secondary_disk->bs, 743 JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 744 NULL, replication_done, bs, true, errp); 745 break; 746 default: 747 aio_context_release(aio_context); 748 abort(); 749 } 750 aio_context_release(aio_context); 751 } 752 753 static const char *const replication_strong_runtime_opts[] = { 754 REPLICATION_MODE, 755 REPLICATION_TOP_ID, 756 757 NULL 758 }; 759 760 static BlockDriver bdrv_replication = { 761 .format_name = "replication", 762 .instance_size = sizeof(BDRVReplicationState), 763 764 .bdrv_open = replication_open, 765 .bdrv_close = replication_close, 766 .bdrv_child_perm = replication_child_perm, 767 768 .bdrv_co_getlength = replication_co_getlength, 769 .bdrv_co_readv = replication_co_readv, 770 .bdrv_co_writev = replication_co_writev, 771 772 .is_filter = true, 773 774 .strong_runtime_opts = replication_strong_runtime_opts, 775 }; 776 777 static void bdrv_replication_init(void) 778 { 779 bdrv_register(&bdrv_replication); 780 } 781 782 block_init(bdrv_replication_init); 783