1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "qemu/osdep.h" 34 #include "sysemu/block-backend.h" 35 #include "sysemu/blockdev.h" 36 #include "hw/block/block.h" 37 #include "block/blockjob.h" 38 #include "block/dirty-bitmap.h" 39 #include "block/qdict.h" 40 #include "block/throttle-groups.h" 41 #include "monitor/monitor.h" 42 #include "qemu/error-report.h" 43 #include "qemu/option.h" 44 #include "qemu/qemu-print.h" 45 #include "qemu/config-file.h" 46 #include "qapi/qapi-commands-block.h" 47 #include "qapi/qapi-commands-transaction.h" 48 #include "qapi/qapi-visit-block-core.h" 49 #include "qapi/qmp/qdict.h" 50 #include "qapi/qmp/qnum.h" 51 #include "qapi/qmp/qstring.h" 52 #include "qapi/error.h" 53 #include "qapi/qmp/qerror.h" 54 #include "qapi/qmp/qlist.h" 55 #include "qapi/qobject-output-visitor.h" 56 #include "sysemu/sysemu.h" 57 #include "sysemu/iothread.h" 58 #include "block/block_int.h" 59 #include "block/trace.h" 60 #include "sysemu/runstate.h" 61 #include "sysemu/replay.h" 62 #include "qemu/cutils.h" 63 #include "qemu/help_option.h" 64 #include "qemu/main-loop.h" 65 #include "qemu/throttle-options.h" 66 67 /* Protected by BQL */ 68 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 69 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 70 71 void bdrv_set_monitor_owned(BlockDriverState *bs) 72 { 73 GLOBAL_STATE_CODE(); 74 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 75 } 76 77 static const char *const if_name[IF_COUNT] = { 78 [IF_NONE] = "none", 79 [IF_IDE] = "ide", 80 [IF_SCSI] = "scsi", 81 [IF_FLOPPY] = "floppy", 82 [IF_PFLASH] = "pflash", 83 [IF_MTD] = "mtd", 84 [IF_SD] = "sd", 85 [IF_VIRTIO] = "virtio", 86 [IF_XEN] = "xen", 87 }; 88 89 static int if_max_devs[IF_COUNT] = { 90 /* 91 * Do not change these numbers! They govern how drive option 92 * index maps to unit and bus. That mapping is ABI. 93 * 94 * All controllers used to implement if=T drives need to support 95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 96 * Otherwise, some index values map to "impossible" bus, unit 97 * values. 98 * 99 * For instance, if you change [IF_SCSI] to 255, -drive 100 * if=scsi,index=12 no longer means bus=1,unit=5, but 101 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 102 * the drive can't be set up. Regression. 103 */ 104 [IF_IDE] = 2, 105 [IF_SCSI] = 7, 106 }; 107 108 /** 109 * Boards may call this to offer board-by-board overrides 110 * of the default, global values. 111 */ 112 void override_max_devs(BlockInterfaceType type, int max_devs) 113 { 114 BlockBackend *blk; 115 DriveInfo *dinfo; 116 117 GLOBAL_STATE_CODE(); 118 119 if (max_devs <= 0) { 120 return; 121 } 122 123 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 124 dinfo = blk_legacy_dinfo(blk); 125 if (dinfo->type == type) { 126 fprintf(stderr, "Cannot override units-per-bus property of" 127 " the %s interface, because a drive of that type has" 128 " already been added.\n", if_name[type]); 129 g_assert_not_reached(); 130 } 131 } 132 133 if_max_devs[type] = max_devs; 134 } 135 136 /* 137 * We automatically delete the drive when a device using it gets 138 * unplugged. Questionable feature, but we can't just drop it. 139 * Device models call blockdev_mark_auto_del() to schedule the 140 * automatic deletion, and generic qdev code calls blockdev_auto_del() 141 * when deletion is actually safe. 142 */ 143 void blockdev_mark_auto_del(BlockBackend *blk) 144 { 145 DriveInfo *dinfo = blk_legacy_dinfo(blk); 146 BlockJob *job; 147 148 GLOBAL_STATE_CODE(); 149 150 if (!dinfo) { 151 return; 152 } 153 154 JOB_LOCK_GUARD(); 155 156 do { 157 job = block_job_next_locked(NULL); 158 while (job && (job->job.cancelled || 159 job->job.deferred_to_main_loop || 160 !block_job_has_bdrv(job, blk_bs(blk)))) 161 { 162 job = block_job_next_locked(job); 163 } 164 if (job) { 165 /* 166 * This drops the job lock temporarily and polls, so we need to 167 * restart processing the list from the start after this. 168 */ 169 job_cancel_locked(&job->job, false); 170 } 171 } while (job); 172 173 dinfo->auto_del = 1; 174 } 175 176 void blockdev_auto_del(BlockBackend *blk) 177 { 178 DriveInfo *dinfo = blk_legacy_dinfo(blk); 179 GLOBAL_STATE_CODE(); 180 181 if (dinfo && dinfo->auto_del) { 182 monitor_remove_blk(blk); 183 blk_unref(blk); 184 } 185 } 186 187 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 188 { 189 int max_devs = if_max_devs[type]; 190 return max_devs ? index / max_devs : 0; 191 } 192 193 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 194 { 195 int max_devs = if_max_devs[type]; 196 return max_devs ? index % max_devs : index; 197 } 198 199 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 200 const char *optstr) 201 { 202 QemuOpts *opts; 203 204 GLOBAL_STATE_CODE(); 205 206 opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 207 if (!opts) { 208 return NULL; 209 } 210 if (type != IF_DEFAULT) { 211 qemu_opt_set(opts, "if", if_name[type], &error_abort); 212 } 213 if (index >= 0) { 214 qemu_opt_set_number(opts, "index", index, &error_abort); 215 } 216 if (file) 217 qemu_opt_set(opts, "file", file, &error_abort); 218 return opts; 219 } 220 221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 222 { 223 BlockBackend *blk; 224 DriveInfo *dinfo; 225 226 GLOBAL_STATE_CODE(); 227 228 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 229 dinfo = blk_legacy_dinfo(blk); 230 if (dinfo && dinfo->type == type 231 && dinfo->bus == bus && dinfo->unit == unit) { 232 return dinfo; 233 } 234 } 235 236 return NULL; 237 } 238 239 /* 240 * Check board claimed all -drive that are meant to be claimed. 241 * Fatal error if any remain unclaimed. 242 */ 243 void drive_check_orphaned(void) 244 { 245 BlockBackend *blk; 246 DriveInfo *dinfo; 247 Location loc; 248 bool orphans = false; 249 250 GLOBAL_STATE_CODE(); 251 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 /* 255 * Ignore default drives, because we create certain default 256 * drives unconditionally, then leave them unclaimed. Not the 257 * users fault. 258 * Ignore IF_VIRTIO, because it gets desugared into -device, 259 * so we can leave failing to -device. 260 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains 261 * available for device_add is a feature. 262 */ 263 if (dinfo->is_default || dinfo->type == IF_VIRTIO 264 || dinfo->type == IF_NONE) { 265 continue; 266 } 267 if (!blk_get_attached_dev(blk)) { 268 loc_push_none(&loc); 269 qemu_opts_loc_restore(dinfo->opts); 270 error_report("machine type does not support" 271 " if=%s,bus=%d,unit=%d", 272 if_name[dinfo->type], dinfo->bus, dinfo->unit); 273 loc_pop(&loc); 274 orphans = true; 275 } 276 } 277 278 if (orphans) { 279 exit(1); 280 } 281 } 282 283 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 284 { 285 GLOBAL_STATE_CODE(); 286 return drive_get(type, 287 drive_index_to_bus_id(type, index), 288 drive_index_to_unit_id(type, index)); 289 } 290 291 int drive_get_max_bus(BlockInterfaceType type) 292 { 293 int max_bus; 294 BlockBackend *blk; 295 DriveInfo *dinfo; 296 297 GLOBAL_STATE_CODE(); 298 299 max_bus = -1; 300 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 301 dinfo = blk_legacy_dinfo(blk); 302 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 303 max_bus = dinfo->bus; 304 } 305 } 306 return max_bus; 307 } 308 309 static void bdrv_format_print(void *opaque, const char *name) 310 { 311 qemu_printf(" %s", name); 312 } 313 314 typedef struct { 315 QEMUBH *bh; 316 BlockDriverState *bs; 317 } BDRVPutRefBH; 318 319 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 320 { 321 if (!strcmp(buf, "ignore")) { 322 return BLOCKDEV_ON_ERROR_IGNORE; 323 } else if (!is_read && !strcmp(buf, "enospc")) { 324 return BLOCKDEV_ON_ERROR_ENOSPC; 325 } else if (!strcmp(buf, "stop")) { 326 return BLOCKDEV_ON_ERROR_STOP; 327 } else if (!strcmp(buf, "report")) { 328 return BLOCKDEV_ON_ERROR_REPORT; 329 } else { 330 error_setg(errp, "'%s' invalid %s error action", 331 buf, is_read ? "read" : "write"); 332 return -1; 333 } 334 } 335 336 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 337 Error **errp) 338 { 339 const QListEntry *entry; 340 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 341 switch (qobject_type(entry->value)) { 342 343 case QTYPE_QSTRING: { 344 unsigned long long length; 345 const char *str = qstring_get_str(qobject_to(QString, 346 entry->value)); 347 if (parse_uint_full(str, &length, 10) == 0 && 348 length > 0 && length <= UINT_MAX) { 349 block_acct_add_interval(stats, (unsigned) length); 350 } else { 351 error_setg(errp, "Invalid interval length: %s", str); 352 return false; 353 } 354 break; 355 } 356 357 case QTYPE_QNUM: { 358 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 359 360 if (length > 0 && length <= UINT_MAX) { 361 block_acct_add_interval(stats, (unsigned) length); 362 } else { 363 error_setg(errp, "Invalid interval length: %" PRId64, length); 364 return false; 365 } 366 break; 367 } 368 369 default: 370 error_setg(errp, "The specification of stats-intervals is invalid"); 371 return false; 372 } 373 } 374 return true; 375 } 376 377 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 378 379 /* All parameters but @opts are optional and may be set to NULL. */ 380 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 381 const char **throttling_group, ThrottleConfig *throttle_cfg, 382 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 383 { 384 Error *local_error = NULL; 385 const char *aio; 386 387 if (bdrv_flags) { 388 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 389 *bdrv_flags |= BDRV_O_COPY_ON_READ; 390 } 391 392 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 393 if (bdrv_parse_aio(aio, bdrv_flags) < 0) { 394 error_setg(errp, "invalid aio option"); 395 return; 396 } 397 } 398 } 399 400 /* disk I/O throttling */ 401 if (throttling_group) { 402 *throttling_group = qemu_opt_get(opts, "throttling.group"); 403 } 404 405 if (throttle_cfg) { 406 throttle_config_init(throttle_cfg); 407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 408 qemu_opt_get_number(opts, "throttling.bps-total", 0); 409 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 410 qemu_opt_get_number(opts, "throttling.bps-read", 0); 411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 412 qemu_opt_get_number(opts, "throttling.bps-write", 0); 413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 414 qemu_opt_get_number(opts, "throttling.iops-total", 0); 415 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 416 qemu_opt_get_number(opts, "throttling.iops-read", 0); 417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 418 qemu_opt_get_number(opts, "throttling.iops-write", 0); 419 420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 422 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 428 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 432 433 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 434 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 435 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 436 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 437 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 438 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 439 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 440 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 441 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 442 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 443 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 444 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 445 446 throttle_cfg->op_size = 447 qemu_opt_get_number(opts, "throttling.iops-size", 0); 448 449 if (!throttle_is_valid(throttle_cfg, errp)) { 450 return; 451 } 452 } 453 454 if (detect_zeroes) { 455 *detect_zeroes = 456 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 457 qemu_opt_get(opts, "detect-zeroes"), 458 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 459 &local_error); 460 if (local_error) { 461 error_propagate(errp, local_error); 462 return; 463 } 464 } 465 } 466 467 static OnOffAuto account_get_opt(QemuOpts *opts, const char *name) 468 { 469 if (!qemu_opt_find(opts, name)) { 470 return ON_OFF_AUTO_AUTO; 471 } 472 if (qemu_opt_get_bool(opts, name, true)) { 473 return ON_OFF_AUTO_ON; 474 } 475 return ON_OFF_AUTO_OFF; 476 } 477 478 /* Takes the ownership of bs_opts */ 479 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 480 Error **errp) 481 { 482 const char *buf; 483 int bdrv_flags = 0; 484 int on_read_error, on_write_error; 485 OnOffAuto account_invalid, account_failed; 486 bool writethrough, read_only; 487 BlockBackend *blk; 488 BlockDriverState *bs; 489 ThrottleConfig cfg; 490 int snapshot = 0; 491 Error *error = NULL; 492 QemuOpts *opts; 493 QDict *interval_dict = NULL; 494 QList *interval_list = NULL; 495 const char *id; 496 BlockdevDetectZeroesOptions detect_zeroes = 497 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 498 const char *throttling_group = NULL; 499 500 /* Check common options by copying from bs_opts to opts, all other options 501 * stay in bs_opts for processing by bdrv_open(). */ 502 id = qdict_get_try_str(bs_opts, "id"); 503 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp); 504 if (!opts) { 505 goto err_no_opts; 506 } 507 508 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) { 509 goto early_err; 510 } 511 512 if (id) { 513 qdict_del(bs_opts, "id"); 514 } 515 516 /* extract parameters */ 517 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 518 519 account_invalid = account_get_opt(opts, "stats-account-invalid"); 520 account_failed = account_get_opt(opts, "stats-account-failed"); 521 522 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 523 524 id = qemu_opts_id(opts); 525 526 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 527 qdict_array_split(interval_dict, &interval_list); 528 529 if (qdict_size(interval_dict) != 0) { 530 error_setg(errp, "Invalid option stats-intervals.%s", 531 qdict_first(interval_dict)->key); 532 goto early_err; 533 } 534 535 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 536 &detect_zeroes, &error); 537 if (error) { 538 error_propagate(errp, error); 539 goto early_err; 540 } 541 542 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 543 if (is_help_option(buf)) { 544 qemu_printf("Supported formats:"); 545 bdrv_iterate_format(bdrv_format_print, NULL, false); 546 qemu_printf("\nSupported formats (read-only):"); 547 bdrv_iterate_format(bdrv_format_print, NULL, true); 548 qemu_printf("\n"); 549 goto early_err; 550 } 551 552 if (qdict_haskey(bs_opts, "driver")) { 553 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 554 goto early_err; 555 } 556 qdict_put_str(bs_opts, "driver", buf); 557 } 558 559 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 560 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 561 on_write_error = parse_block_error_action(buf, 0, &error); 562 if (error) { 563 error_propagate(errp, error); 564 goto early_err; 565 } 566 } 567 568 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 569 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 570 on_read_error = parse_block_error_action(buf, 1, &error); 571 if (error) { 572 error_propagate(errp, error); 573 goto early_err; 574 } 575 } 576 577 if (snapshot) { 578 bdrv_flags |= BDRV_O_SNAPSHOT; 579 } 580 581 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 582 583 /* init */ 584 if ((!file || !*file) && !qdict_size(bs_opts)) { 585 BlockBackendRootState *blk_rs; 586 587 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 588 blk_rs = blk_get_root_state(blk); 589 blk_rs->open_flags = bdrv_flags | (read_only ? 0 : BDRV_O_RDWR); 590 blk_rs->detect_zeroes = detect_zeroes; 591 592 qobject_unref(bs_opts); 593 } else { 594 if (file && !*file) { 595 file = NULL; 596 } 597 598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 599 * with other callers) rather than what we want as the real defaults. 600 * Apply the defaults here instead. */ 601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 603 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 604 read_only ? "on" : "off"); 605 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 606 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 607 608 if (runstate_check(RUN_STATE_INMIGRATE)) { 609 bdrv_flags |= BDRV_O_INACTIVE; 610 } 611 612 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 613 if (!blk) { 614 goto err_no_bs_opts; 615 } 616 bs = blk_bs(blk); 617 618 bs->detect_zeroes = detect_zeroes; 619 620 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 621 622 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 623 blk_unref(blk); 624 blk = NULL; 625 goto err_no_bs_opts; 626 } 627 } 628 629 /* disk I/O throttling */ 630 if (throttle_enabled(&cfg)) { 631 if (!throttling_group) { 632 throttling_group = id; 633 } 634 blk_io_limits_enable(blk, throttling_group); 635 blk_set_io_limits(blk, &cfg); 636 } 637 638 blk_set_enable_write_cache(blk, !writethrough); 639 blk_set_on_error(blk, on_read_error, on_write_error); 640 641 if (!monitor_add_blk(blk, id, errp)) { 642 blk_unref(blk); 643 blk = NULL; 644 goto err_no_bs_opts; 645 } 646 647 err_no_bs_opts: 648 qemu_opts_del(opts); 649 qobject_unref(interval_dict); 650 qobject_unref(interval_list); 651 return blk; 652 653 early_err: 654 qemu_opts_del(opts); 655 qobject_unref(interval_dict); 656 qobject_unref(interval_list); 657 err_no_opts: 658 qobject_unref(bs_opts); 659 return NULL; 660 } 661 662 /* Takes the ownership of bs_opts */ 663 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 664 { 665 int bdrv_flags = 0; 666 667 GLOBAL_STATE_CODE(); 668 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 669 * with other callers) rather than what we want as the real defaults. 670 * Apply the defaults here instead. */ 671 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 672 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 673 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 674 675 if (runstate_check(RUN_STATE_INMIGRATE)) { 676 bdrv_flags |= BDRV_O_INACTIVE; 677 } 678 679 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 680 } 681 682 void blockdev_close_all_bdrv_states(void) 683 { 684 BlockDriverState *bs, *next_bs; 685 686 GLOBAL_STATE_CODE(); 687 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 688 AioContext *ctx = bdrv_get_aio_context(bs); 689 690 aio_context_acquire(ctx); 691 bdrv_unref(bs); 692 aio_context_release(ctx); 693 } 694 } 695 696 /* Iterates over the list of monitor-owned BlockDriverStates */ 697 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 698 { 699 GLOBAL_STATE_CODE(); 700 return bs ? QTAILQ_NEXT(bs, monitor_list) 701 : QTAILQ_FIRST(&monitor_bdrv_states); 702 } 703 704 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 705 Error **errp) 706 { 707 const char *value; 708 709 value = qemu_opt_get(opts, from); 710 if (value) { 711 if (qemu_opt_find(opts, to)) { 712 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 713 "same time", to, from); 714 return false; 715 } 716 } 717 718 /* rename all items in opts */ 719 while ((value = qemu_opt_get(opts, from))) { 720 qemu_opt_set(opts, to, value, &error_abort); 721 qemu_opt_unset(opts, from); 722 } 723 return true; 724 } 725 726 QemuOptsList qemu_legacy_drive_opts = { 727 .name = "drive", 728 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 729 .desc = { 730 { 731 .name = "bus", 732 .type = QEMU_OPT_NUMBER, 733 .help = "bus number", 734 },{ 735 .name = "unit", 736 .type = QEMU_OPT_NUMBER, 737 .help = "unit number (i.e. lun for scsi)", 738 },{ 739 .name = "index", 740 .type = QEMU_OPT_NUMBER, 741 .help = "index number", 742 },{ 743 .name = "media", 744 .type = QEMU_OPT_STRING, 745 .help = "media type (disk, cdrom)", 746 },{ 747 .name = "if", 748 .type = QEMU_OPT_STRING, 749 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 750 },{ 751 .name = "file", 752 .type = QEMU_OPT_STRING, 753 .help = "file name", 754 }, 755 756 /* Options that are passed on, but have special semantics with -drive */ 757 { 758 .name = BDRV_OPT_READ_ONLY, 759 .type = QEMU_OPT_BOOL, 760 .help = "open drive file as read-only", 761 },{ 762 .name = "rerror", 763 .type = QEMU_OPT_STRING, 764 .help = "read error action", 765 },{ 766 .name = "werror", 767 .type = QEMU_OPT_STRING, 768 .help = "write error action", 769 },{ 770 .name = "copy-on-read", 771 .type = QEMU_OPT_BOOL, 772 .help = "copy read data from backing file into image file", 773 }, 774 775 { /* end of list */ } 776 }, 777 }; 778 779 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 780 Error **errp) 781 { 782 const char *value; 783 BlockBackend *blk; 784 DriveInfo *dinfo = NULL; 785 QDict *bs_opts; 786 QemuOpts *legacy_opts; 787 DriveMediaType media = MEDIA_DISK; 788 BlockInterfaceType type; 789 int max_devs, bus_id, unit_id, index; 790 const char *werror, *rerror; 791 bool read_only = false; 792 bool copy_on_read; 793 const char *filename; 794 int i; 795 796 GLOBAL_STATE_CODE(); 797 798 /* Change legacy command line options into QMP ones */ 799 static const struct { 800 const char *from; 801 const char *to; 802 } opt_renames[] = { 803 { "iops", "throttling.iops-total" }, 804 { "iops_rd", "throttling.iops-read" }, 805 { "iops_wr", "throttling.iops-write" }, 806 807 { "bps", "throttling.bps-total" }, 808 { "bps_rd", "throttling.bps-read" }, 809 { "bps_wr", "throttling.bps-write" }, 810 811 { "iops_max", "throttling.iops-total-max" }, 812 { "iops_rd_max", "throttling.iops-read-max" }, 813 { "iops_wr_max", "throttling.iops-write-max" }, 814 815 { "bps_max", "throttling.bps-total-max" }, 816 { "bps_rd_max", "throttling.bps-read-max" }, 817 { "bps_wr_max", "throttling.bps-write-max" }, 818 819 { "iops_size", "throttling.iops-size" }, 820 821 { "group", "throttling.group" }, 822 823 { "readonly", BDRV_OPT_READ_ONLY }, 824 }; 825 826 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 827 if (!qemu_opt_rename(all_opts, opt_renames[i].from, 828 opt_renames[i].to, errp)) { 829 return NULL; 830 } 831 } 832 833 value = qemu_opt_get(all_opts, "cache"); 834 if (value) { 835 int flags = 0; 836 bool writethrough; 837 838 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 839 error_setg(errp, "invalid cache option"); 840 return NULL; 841 } 842 843 /* Specific options take precedence */ 844 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 845 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 846 !writethrough, &error_abort); 847 } 848 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 849 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 850 !!(flags & BDRV_O_NOCACHE), &error_abort); 851 } 852 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 853 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 854 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 855 } 856 qemu_opt_unset(all_opts, "cache"); 857 } 858 859 /* Get a QDict for processing the options */ 860 bs_opts = qdict_new(); 861 qemu_opts_to_qdict(all_opts, bs_opts); 862 863 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 864 &error_abort); 865 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) { 866 goto fail; 867 } 868 869 /* Media type */ 870 value = qemu_opt_get(legacy_opts, "media"); 871 if (value) { 872 if (!strcmp(value, "disk")) { 873 media = MEDIA_DISK; 874 } else if (!strcmp(value, "cdrom")) { 875 media = MEDIA_CDROM; 876 read_only = true; 877 } else { 878 error_setg(errp, "'%s' invalid media", value); 879 goto fail; 880 } 881 } 882 883 /* copy-on-read is disabled with a warning for read-only devices */ 884 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 885 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 886 887 if (read_only && copy_on_read) { 888 warn_report("disabling copy-on-read on read-only drive"); 889 copy_on_read = false; 890 } 891 892 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 893 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 894 895 /* Controller type */ 896 value = qemu_opt_get(legacy_opts, "if"); 897 if (value) { 898 for (type = 0; 899 type < IF_COUNT && strcmp(value, if_name[type]); 900 type++) { 901 } 902 if (type == IF_COUNT) { 903 error_setg(errp, "unsupported bus type '%s'", value); 904 goto fail; 905 } 906 } else { 907 type = block_default_type; 908 } 909 910 /* Device address specified by bus/unit or index. 911 * If none was specified, try to find the first free one. */ 912 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 913 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 914 index = qemu_opt_get_number(legacy_opts, "index", -1); 915 916 max_devs = if_max_devs[type]; 917 918 if (index != -1) { 919 if (bus_id != 0 || unit_id != -1) { 920 error_setg(errp, "index cannot be used with bus and unit"); 921 goto fail; 922 } 923 bus_id = drive_index_to_bus_id(type, index); 924 unit_id = drive_index_to_unit_id(type, index); 925 } 926 927 if (unit_id == -1) { 928 unit_id = 0; 929 while (drive_get(type, bus_id, unit_id) != NULL) { 930 unit_id++; 931 if (max_devs && unit_id >= max_devs) { 932 unit_id -= max_devs; 933 bus_id++; 934 } 935 } 936 } 937 938 if (max_devs && unit_id >= max_devs) { 939 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 940 goto fail; 941 } 942 943 if (drive_get(type, bus_id, unit_id) != NULL) { 944 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 945 bus_id, unit_id, index); 946 goto fail; 947 } 948 949 /* no id supplied -> create one */ 950 if (qemu_opts_id(all_opts) == NULL) { 951 char *new_id; 952 const char *mediastr = ""; 953 if (type == IF_IDE || type == IF_SCSI) { 954 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 955 } 956 if (max_devs) { 957 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 958 mediastr, unit_id); 959 } else { 960 new_id = g_strdup_printf("%s%s%i", if_name[type], 961 mediastr, unit_id); 962 } 963 qdict_put_str(bs_opts, "id", new_id); 964 g_free(new_id); 965 } 966 967 /* Add virtio block device */ 968 if (type == IF_VIRTIO) { 969 QemuOpts *devopts; 970 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 971 &error_abort); 972 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort); 973 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 974 &error_abort); 975 } 976 977 filename = qemu_opt_get(legacy_opts, "file"); 978 979 /* Check werror/rerror compatibility with if=... */ 980 werror = qemu_opt_get(legacy_opts, "werror"); 981 if (werror != NULL) { 982 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 983 type != IF_NONE) { 984 error_setg(errp, "werror is not supported by this bus type"); 985 goto fail; 986 } 987 qdict_put_str(bs_opts, "werror", werror); 988 } 989 990 rerror = qemu_opt_get(legacy_opts, "rerror"); 991 if (rerror != NULL) { 992 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 993 type != IF_NONE) { 994 error_setg(errp, "rerror is not supported by this bus type"); 995 goto fail; 996 } 997 qdict_put_str(bs_opts, "rerror", rerror); 998 } 999 1000 /* Actual block device init: Functionality shared with blockdev-add */ 1001 blk = blockdev_init(filename, bs_opts, errp); 1002 bs_opts = NULL; 1003 if (!blk) { 1004 goto fail; 1005 } 1006 1007 /* Create legacy DriveInfo */ 1008 dinfo = g_malloc0(sizeof(*dinfo)); 1009 dinfo->opts = all_opts; 1010 1011 dinfo->type = type; 1012 dinfo->bus = bus_id; 1013 dinfo->unit = unit_id; 1014 1015 blk_set_legacy_dinfo(blk, dinfo); 1016 1017 switch(type) { 1018 case IF_IDE: 1019 case IF_SCSI: 1020 case IF_XEN: 1021 case IF_NONE: 1022 dinfo->media_cd = media == MEDIA_CDROM; 1023 break; 1024 default: 1025 break; 1026 } 1027 1028 fail: 1029 qemu_opts_del(legacy_opts); 1030 qobject_unref(bs_opts); 1031 return dinfo; 1032 } 1033 1034 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1035 { 1036 BlockDriverState *bs; 1037 AioContext *aio_context; 1038 1039 bs = bdrv_lookup_bs(name, name, errp); 1040 if (bs == NULL) { 1041 return NULL; 1042 } 1043 1044 if (!bdrv_is_root_node(bs)) { 1045 error_setg(errp, "Need a root block node"); 1046 return NULL; 1047 } 1048 1049 aio_context = bdrv_get_aio_context(bs); 1050 aio_context_acquire(aio_context); 1051 1052 if (!bdrv_is_inserted(bs)) { 1053 error_setg(errp, "Device has no medium"); 1054 bs = NULL; 1055 } 1056 1057 aio_context_release(aio_context); 1058 1059 return bs; 1060 } 1061 1062 static void blockdev_do_action(TransactionAction *action, Error **errp) 1063 { 1064 TransactionActionList list; 1065 1066 list.value = action; 1067 list.next = NULL; 1068 qmp_transaction(&list, NULL, errp); 1069 } 1070 1071 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name, 1072 const char *snapshot_file, 1073 const char *snapshot_node_name, 1074 const char *format, 1075 bool has_mode, NewImageMode mode, Error **errp) 1076 { 1077 BlockdevSnapshotSync snapshot = { 1078 .device = (char *) device, 1079 .node_name = (char *) node_name, 1080 .snapshot_file = (char *) snapshot_file, 1081 .snapshot_node_name = (char *) snapshot_node_name, 1082 .format = (char *) format, 1083 .has_mode = has_mode, 1084 .mode = mode, 1085 }; 1086 TransactionAction action = { 1087 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1088 .u.blockdev_snapshot_sync.data = &snapshot, 1089 }; 1090 blockdev_do_action(&action, errp); 1091 } 1092 1093 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1094 Error **errp) 1095 { 1096 BlockdevSnapshot snapshot_data = { 1097 .node = (char *) node, 1098 .overlay = (char *) overlay 1099 }; 1100 TransactionAction action = { 1101 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1102 .u.blockdev_snapshot.data = &snapshot_data, 1103 }; 1104 blockdev_do_action(&action, errp); 1105 } 1106 1107 void qmp_blockdev_snapshot_internal_sync(const char *device, 1108 const char *name, 1109 Error **errp) 1110 { 1111 BlockdevSnapshotInternal snapshot = { 1112 .device = (char *) device, 1113 .name = (char *) name 1114 }; 1115 TransactionAction action = { 1116 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1117 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1118 }; 1119 blockdev_do_action(&action, errp); 1120 } 1121 1122 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1123 const char *id, 1124 const char *name, 1125 Error **errp) 1126 { 1127 BlockDriverState *bs; 1128 AioContext *aio_context; 1129 QEMUSnapshotInfo sn; 1130 Error *local_err = NULL; 1131 SnapshotInfo *info = NULL; 1132 int ret; 1133 1134 bs = qmp_get_root_bs(device, errp); 1135 if (!bs) { 1136 return NULL; 1137 } 1138 aio_context = bdrv_get_aio_context(bs); 1139 aio_context_acquire(aio_context); 1140 1141 if (!id && !name) { 1142 error_setg(errp, "Name or id must be provided"); 1143 goto out_aio_context; 1144 } 1145 1146 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1147 goto out_aio_context; 1148 } 1149 1150 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1151 if (local_err) { 1152 error_propagate(errp, local_err); 1153 goto out_aio_context; 1154 } 1155 if (!ret) { 1156 error_setg(errp, 1157 "Snapshot with id '%s' and name '%s' does not exist on " 1158 "device '%s'", 1159 STR_OR_NULL(id), STR_OR_NULL(name), device); 1160 goto out_aio_context; 1161 } 1162 1163 bdrv_snapshot_delete(bs, id, name, &local_err); 1164 if (local_err) { 1165 error_propagate(errp, local_err); 1166 goto out_aio_context; 1167 } 1168 1169 aio_context_release(aio_context); 1170 1171 info = g_new0(SnapshotInfo, 1); 1172 info->id = g_strdup(sn.id_str); 1173 info->name = g_strdup(sn.name); 1174 info->date_nsec = sn.date_nsec; 1175 info->date_sec = sn.date_sec; 1176 info->vm_state_size = sn.vm_state_size; 1177 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1178 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1179 if (sn.icount != -1ULL) { 1180 info->icount = sn.icount; 1181 info->has_icount = true; 1182 } 1183 1184 return info; 1185 1186 out_aio_context: 1187 aio_context_release(aio_context); 1188 return NULL; 1189 } 1190 1191 /* internal snapshot private data */ 1192 typedef struct InternalSnapshotState { 1193 BlockDriverState *bs; 1194 QEMUSnapshotInfo sn; 1195 bool created; 1196 } InternalSnapshotState; 1197 1198 static void internal_snapshot_abort(void *opaque); 1199 static void internal_snapshot_clean(void *opaque); 1200 TransactionActionDrv internal_snapshot_drv = { 1201 .abort = internal_snapshot_abort, 1202 .clean = internal_snapshot_clean, 1203 }; 1204 1205 static void internal_snapshot_action(BlockdevSnapshotInternal *internal, 1206 Transaction *tran, Error **errp) 1207 { 1208 Error *local_err = NULL; 1209 const char *device; 1210 const char *name; 1211 BlockDriverState *bs; 1212 QEMUSnapshotInfo old_sn, *sn; 1213 bool ret; 1214 int64_t rt; 1215 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1); 1216 AioContext *aio_context; 1217 int ret1; 1218 1219 tran_add(tran, &internal_snapshot_drv, state); 1220 1221 device = internal->device; 1222 name = internal->name; 1223 1224 bs = qmp_get_root_bs(device, errp); 1225 if (!bs) { 1226 return; 1227 } 1228 1229 aio_context = bdrv_get_aio_context(bs); 1230 aio_context_acquire(aio_context); 1231 1232 state->bs = bs; 1233 1234 /* Paired with .clean() */ 1235 bdrv_drained_begin(bs); 1236 1237 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1238 goto out; 1239 } 1240 1241 if (bdrv_is_read_only(bs)) { 1242 error_setg(errp, "Device '%s' is read only", device); 1243 goto out; 1244 } 1245 1246 if (!bdrv_can_snapshot(bs)) { 1247 error_setg(errp, "Block format '%s' used by device '%s' " 1248 "does not support internal snapshots", 1249 bs->drv->format_name, device); 1250 goto out; 1251 } 1252 1253 if (!strlen(name)) { 1254 error_setg(errp, "Name is empty"); 1255 goto out; 1256 } 1257 1258 /* check whether a snapshot with name exist */ 1259 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1260 &local_err); 1261 if (local_err) { 1262 error_propagate(errp, local_err); 1263 goto out; 1264 } else if (ret) { 1265 error_setg(errp, 1266 "Snapshot with name '%s' already exists on device '%s'", 1267 name, device); 1268 goto out; 1269 } 1270 1271 /* 3. take the snapshot */ 1272 sn = &state->sn; 1273 pstrcpy(sn->name, sizeof(sn->name), name); 1274 rt = g_get_real_time(); 1275 sn->date_sec = rt / G_USEC_PER_SEC; 1276 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000; 1277 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1278 if (replay_mode != REPLAY_MODE_NONE) { 1279 sn->icount = replay_get_current_icount(); 1280 } else { 1281 sn->icount = -1ULL; 1282 } 1283 1284 ret1 = bdrv_snapshot_create(bs, sn); 1285 if (ret1 < 0) { 1286 error_setg_errno(errp, -ret1, 1287 "Failed to create snapshot '%s' on device '%s'", 1288 name, device); 1289 goto out; 1290 } 1291 1292 /* 4. succeed, mark a snapshot is created */ 1293 state->created = true; 1294 1295 out: 1296 aio_context_release(aio_context); 1297 } 1298 1299 static void internal_snapshot_abort(void *opaque) 1300 { 1301 InternalSnapshotState *state = opaque; 1302 BlockDriverState *bs = state->bs; 1303 QEMUSnapshotInfo *sn = &state->sn; 1304 AioContext *aio_context; 1305 Error *local_error = NULL; 1306 1307 if (!state->created) { 1308 return; 1309 } 1310 1311 aio_context = bdrv_get_aio_context(state->bs); 1312 aio_context_acquire(aio_context); 1313 1314 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1315 error_reportf_err(local_error, 1316 "Failed to delete snapshot with id '%s' and " 1317 "name '%s' on device '%s' in abort: ", 1318 sn->id_str, sn->name, 1319 bdrv_get_device_name(bs)); 1320 } 1321 1322 aio_context_release(aio_context); 1323 } 1324 1325 static void internal_snapshot_clean(void *opaque) 1326 { 1327 g_autofree InternalSnapshotState *state = opaque; 1328 AioContext *aio_context; 1329 1330 if (!state->bs) { 1331 return; 1332 } 1333 1334 aio_context = bdrv_get_aio_context(state->bs); 1335 aio_context_acquire(aio_context); 1336 1337 bdrv_drained_end(state->bs); 1338 1339 aio_context_release(aio_context); 1340 } 1341 1342 /* external snapshot private data */ 1343 typedef struct ExternalSnapshotState { 1344 BlockDriverState *old_bs; 1345 BlockDriverState *new_bs; 1346 bool overlay_appended; 1347 } ExternalSnapshotState; 1348 1349 static void external_snapshot_commit(void *opaque); 1350 static void external_snapshot_abort(void *opaque); 1351 static void external_snapshot_clean(void *opaque); 1352 TransactionActionDrv external_snapshot_drv = { 1353 .commit = external_snapshot_commit, 1354 .abort = external_snapshot_abort, 1355 .clean = external_snapshot_clean, 1356 }; 1357 1358 static void external_snapshot_action(TransactionAction *action, 1359 Transaction *tran, Error **errp) 1360 { 1361 int ret; 1362 int flags = 0; 1363 QDict *options = NULL; 1364 Error *local_err = NULL; 1365 /* Device and node name of the image to generate the snapshot from */ 1366 const char *device; 1367 const char *node_name; 1368 /* Reference to the new image (for 'blockdev-snapshot') */ 1369 const char *snapshot_ref; 1370 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1371 const char *new_image_file; 1372 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1); 1373 AioContext *aio_context; 1374 uint64_t perm, shared; 1375 1376 tran_add(tran, &external_snapshot_drv, state); 1377 1378 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1379 * purpose but a different set of parameters */ 1380 switch (action->type) { 1381 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1382 { 1383 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1384 device = s->node; 1385 node_name = s->node; 1386 new_image_file = NULL; 1387 snapshot_ref = s->overlay; 1388 } 1389 break; 1390 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1391 { 1392 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1393 device = s->device; 1394 node_name = s->node_name; 1395 new_image_file = s->snapshot_file; 1396 snapshot_ref = NULL; 1397 } 1398 break; 1399 default: 1400 g_assert_not_reached(); 1401 } 1402 1403 /* start processing */ 1404 1405 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1406 if (!state->old_bs) { 1407 return; 1408 } 1409 1410 aio_context = bdrv_get_aio_context(state->old_bs); 1411 aio_context_acquire(aio_context); 1412 1413 /* Paired with .clean() */ 1414 bdrv_drained_begin(state->old_bs); 1415 1416 if (!bdrv_is_inserted(state->old_bs)) { 1417 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1418 goto out; 1419 } 1420 1421 if (bdrv_op_is_blocked(state->old_bs, 1422 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1423 goto out; 1424 } 1425 1426 if (!bdrv_is_read_only(state->old_bs)) { 1427 if (bdrv_flush(state->old_bs)) { 1428 error_setg(errp, QERR_IO_ERROR); 1429 goto out; 1430 } 1431 } 1432 1433 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1434 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1435 const char *format = s->format ?: "qcow2"; 1436 enum NewImageMode mode; 1437 const char *snapshot_node_name = s->snapshot_node_name; 1438 1439 if (node_name && !snapshot_node_name) { 1440 error_setg(errp, "New overlay node-name missing"); 1441 goto out; 1442 } 1443 1444 if (snapshot_node_name && 1445 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1446 error_setg(errp, "New overlay node-name already in use"); 1447 goto out; 1448 } 1449 1450 flags = state->old_bs->open_flags; 1451 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1452 flags |= BDRV_O_NO_BACKING; 1453 1454 /* create new image w/backing file */ 1455 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1456 if (mode != NEW_IMAGE_MODE_EXISTING) { 1457 int64_t size = bdrv_getlength(state->old_bs); 1458 if (size < 0) { 1459 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1460 goto out; 1461 } 1462 bdrv_refresh_filename(state->old_bs); 1463 1464 aio_context_release(aio_context); 1465 bdrv_img_create(new_image_file, format, 1466 state->old_bs->filename, 1467 state->old_bs->drv->format_name, 1468 NULL, size, flags, false, &local_err); 1469 aio_context_acquire(aio_context); 1470 1471 if (local_err) { 1472 error_propagate(errp, local_err); 1473 goto out; 1474 } 1475 } 1476 1477 options = qdict_new(); 1478 if (snapshot_node_name) { 1479 qdict_put_str(options, "node-name", snapshot_node_name); 1480 } 1481 qdict_put_str(options, "driver", format); 1482 } 1483 1484 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1485 errp); 1486 /* We will manually add the backing_hd field to the bs later */ 1487 if (!state->new_bs) { 1488 goto out; 1489 } 1490 1491 /* 1492 * Allow attaching a backing file to an overlay that's already in use only 1493 * if the parents don't assume that they are already seeing a valid image. 1494 * (Specifically, allow it as a mirror target, which is write-only access.) 1495 */ 1496 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); 1497 if (perm & BLK_PERM_CONSISTENT_READ) { 1498 error_setg(errp, "The overlay is already in use"); 1499 goto out; 1500 } 1501 1502 if (state->new_bs->drv->is_filter) { 1503 error_setg(errp, "Filters cannot be used as overlays"); 1504 goto out; 1505 } 1506 1507 if (bdrv_cow_child(state->new_bs)) { 1508 error_setg(errp, "The overlay already has a backing image"); 1509 goto out; 1510 } 1511 1512 if (!state->new_bs->drv->supports_backing) { 1513 error_setg(errp, "The overlay does not support backing images"); 1514 goto out; 1515 } 1516 1517 ret = bdrv_append(state->new_bs, state->old_bs, errp); 1518 if (ret < 0) { 1519 goto out; 1520 } 1521 state->overlay_appended = true; 1522 1523 out: 1524 aio_context_release(aio_context); 1525 } 1526 1527 static void external_snapshot_commit(void *opaque) 1528 { 1529 ExternalSnapshotState *state = opaque; 1530 AioContext *aio_context; 1531 1532 aio_context = bdrv_get_aio_context(state->old_bs); 1533 aio_context_acquire(aio_context); 1534 1535 /* We don't need (or want) to use the transactional 1536 * bdrv_reopen_multiple() across all the entries at once, because we 1537 * don't want to abort all of them if one of them fails the reopen */ 1538 if (!qatomic_read(&state->old_bs->copy_on_read)) { 1539 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1540 } 1541 1542 aio_context_release(aio_context); 1543 } 1544 1545 static void external_snapshot_abort(void *opaque) 1546 { 1547 ExternalSnapshotState *state = opaque; 1548 if (state->new_bs) { 1549 if (state->overlay_appended) { 1550 AioContext *aio_context; 1551 AioContext *tmp_context; 1552 int ret; 1553 1554 aio_context = bdrv_get_aio_context(state->old_bs); 1555 aio_context_acquire(aio_context); 1556 1557 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1558 close state->old_bs; we need it */ 1559 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1560 1561 /* 1562 * The call to bdrv_set_backing_hd() above returns state->old_bs to 1563 * the main AioContext. As we're still going to be using it, return 1564 * it to the AioContext it was before. 1565 */ 1566 tmp_context = bdrv_get_aio_context(state->old_bs); 1567 if (aio_context != tmp_context) { 1568 aio_context_release(aio_context); 1569 aio_context_acquire(tmp_context); 1570 1571 ret = bdrv_try_change_aio_context(state->old_bs, 1572 aio_context, NULL, NULL); 1573 assert(ret == 0); 1574 1575 aio_context_release(tmp_context); 1576 aio_context_acquire(aio_context); 1577 } 1578 1579 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1580 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1581 1582 aio_context_release(aio_context); 1583 } 1584 } 1585 } 1586 1587 static void external_snapshot_clean(void *opaque) 1588 { 1589 g_autofree ExternalSnapshotState *state = opaque; 1590 AioContext *aio_context; 1591 1592 if (!state->old_bs) { 1593 return; 1594 } 1595 1596 aio_context = bdrv_get_aio_context(state->old_bs); 1597 aio_context_acquire(aio_context); 1598 1599 bdrv_drained_end(state->old_bs); 1600 bdrv_unref(state->new_bs); 1601 1602 aio_context_release(aio_context); 1603 } 1604 1605 typedef struct DriveBackupState { 1606 BlockDriverState *bs; 1607 BlockJob *job; 1608 } DriveBackupState; 1609 1610 static BlockJob *do_backup_common(BackupCommon *backup, 1611 BlockDriverState *bs, 1612 BlockDriverState *target_bs, 1613 AioContext *aio_context, 1614 JobTxn *txn, Error **errp); 1615 1616 static void drive_backup_commit(void *opaque); 1617 static void drive_backup_abort(void *opaque); 1618 static void drive_backup_clean(void *opaque); 1619 TransactionActionDrv drive_backup_drv = { 1620 .commit = drive_backup_commit, 1621 .abort = drive_backup_abort, 1622 .clean = drive_backup_clean, 1623 }; 1624 1625 static void drive_backup_action(DriveBackup *backup, 1626 JobTxn *block_job_txn, 1627 Transaction *tran, Error **errp) 1628 { 1629 DriveBackupState *state = g_new0(DriveBackupState, 1); 1630 BlockDriverState *bs; 1631 BlockDriverState *target_bs; 1632 BlockDriverState *source = NULL; 1633 AioContext *aio_context; 1634 AioContext *old_context; 1635 const char *format; 1636 QDict *options; 1637 Error *local_err = NULL; 1638 int flags; 1639 int64_t size; 1640 bool set_backing_hd = false; 1641 int ret; 1642 1643 tran_add(tran, &drive_backup_drv, state); 1644 1645 if (!backup->has_mode) { 1646 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1647 } 1648 1649 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1650 if (!bs) { 1651 return; 1652 } 1653 1654 if (!bs->drv) { 1655 error_setg(errp, "Device has no medium"); 1656 return; 1657 } 1658 1659 aio_context = bdrv_get_aio_context(bs); 1660 aio_context_acquire(aio_context); 1661 1662 state->bs = bs; 1663 /* Paired with .clean() */ 1664 bdrv_drained_begin(bs); 1665 1666 format = backup->format; 1667 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) { 1668 format = bs->drv->format_name; 1669 } 1670 1671 /* Early check to avoid creating target */ 1672 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 1673 goto out; 1674 } 1675 1676 flags = bs->open_flags | BDRV_O_RDWR; 1677 1678 /* 1679 * See if we have a backing HD we can use to create our new image 1680 * on top of. 1681 */ 1682 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 1683 /* 1684 * Backup will not replace the source by the target, so none 1685 * of the filters skipped here will be removed (in contrast to 1686 * mirror). Therefore, we can skip all of them when looking 1687 * for the first COW relationship. 1688 */ 1689 source = bdrv_cow_bs(bdrv_skip_filters(bs)); 1690 if (!source) { 1691 backup->sync = MIRROR_SYNC_MODE_FULL; 1692 } 1693 } 1694 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 1695 source = bs; 1696 flags |= BDRV_O_NO_BACKING; 1697 set_backing_hd = true; 1698 } 1699 1700 size = bdrv_getlength(bs); 1701 if (size < 0) { 1702 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1703 goto out; 1704 } 1705 1706 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 1707 assert(format); 1708 if (source) { 1709 /* Implicit filters should not appear in the filename */ 1710 BlockDriverState *explicit_backing = 1711 bdrv_skip_implicit_filters(source); 1712 1713 bdrv_refresh_filename(explicit_backing); 1714 bdrv_img_create(backup->target, format, 1715 explicit_backing->filename, 1716 explicit_backing->drv->format_name, NULL, 1717 size, flags, false, &local_err); 1718 } else { 1719 bdrv_img_create(backup->target, format, NULL, NULL, NULL, 1720 size, flags, false, &local_err); 1721 } 1722 } 1723 1724 if (local_err) { 1725 error_propagate(errp, local_err); 1726 goto out; 1727 } 1728 1729 options = qdict_new(); 1730 qdict_put_str(options, "discard", "unmap"); 1731 qdict_put_str(options, "detect-zeroes", "unmap"); 1732 if (format) { 1733 qdict_put_str(options, "driver", format); 1734 } 1735 1736 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 1737 if (!target_bs) { 1738 goto out; 1739 } 1740 1741 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1742 old_context = bdrv_get_aio_context(target_bs); 1743 aio_context_release(aio_context); 1744 aio_context_acquire(old_context); 1745 1746 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1747 if (ret < 0) { 1748 bdrv_unref(target_bs); 1749 aio_context_release(old_context); 1750 return; 1751 } 1752 1753 aio_context_release(old_context); 1754 aio_context_acquire(aio_context); 1755 1756 if (set_backing_hd) { 1757 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { 1758 goto unref; 1759 } 1760 } 1761 1762 state->job = do_backup_common(qapi_DriveBackup_base(backup), 1763 bs, target_bs, aio_context, 1764 block_job_txn, errp); 1765 1766 unref: 1767 bdrv_unref(target_bs); 1768 out: 1769 aio_context_release(aio_context); 1770 } 1771 1772 static void drive_backup_commit(void *opaque) 1773 { 1774 DriveBackupState *state = opaque; 1775 AioContext *aio_context; 1776 1777 aio_context = bdrv_get_aio_context(state->bs); 1778 aio_context_acquire(aio_context); 1779 1780 assert(state->job); 1781 job_start(&state->job->job); 1782 1783 aio_context_release(aio_context); 1784 } 1785 1786 static void drive_backup_abort(void *opaque) 1787 { 1788 DriveBackupState *state = opaque; 1789 1790 if (state->job) { 1791 job_cancel_sync(&state->job->job, true); 1792 } 1793 } 1794 1795 static void drive_backup_clean(void *opaque) 1796 { 1797 g_autofree DriveBackupState *state = opaque; 1798 AioContext *aio_context; 1799 1800 if (!state->bs) { 1801 return; 1802 } 1803 1804 aio_context = bdrv_get_aio_context(state->bs); 1805 aio_context_acquire(aio_context); 1806 1807 bdrv_drained_end(state->bs); 1808 1809 aio_context_release(aio_context); 1810 } 1811 1812 typedef struct BlockdevBackupState { 1813 BlockDriverState *bs; 1814 BlockJob *job; 1815 } BlockdevBackupState; 1816 1817 static void blockdev_backup_commit(void *opaque); 1818 static void blockdev_backup_abort(void *opaque); 1819 static void blockdev_backup_clean(void *opaque); 1820 TransactionActionDrv blockdev_backup_drv = { 1821 .commit = blockdev_backup_commit, 1822 .abort = blockdev_backup_abort, 1823 .clean = blockdev_backup_clean, 1824 }; 1825 1826 static void blockdev_backup_action(BlockdevBackup *backup, 1827 JobTxn *block_job_txn, 1828 Transaction *tran, Error **errp) 1829 { 1830 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1); 1831 BlockDriverState *bs; 1832 BlockDriverState *target_bs; 1833 AioContext *aio_context; 1834 AioContext *old_context; 1835 int ret; 1836 1837 tran_add(tran, &blockdev_backup_drv, state); 1838 1839 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1840 if (!bs) { 1841 return; 1842 } 1843 1844 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 1845 if (!target_bs) { 1846 return; 1847 } 1848 1849 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1850 aio_context = bdrv_get_aio_context(bs); 1851 old_context = bdrv_get_aio_context(target_bs); 1852 aio_context_acquire(old_context); 1853 1854 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1855 if (ret < 0) { 1856 aio_context_release(old_context); 1857 return; 1858 } 1859 1860 aio_context_release(old_context); 1861 aio_context_acquire(aio_context); 1862 state->bs = bs; 1863 1864 /* Paired with .clean() */ 1865 bdrv_drained_begin(state->bs); 1866 1867 state->job = do_backup_common(qapi_BlockdevBackup_base(backup), 1868 bs, target_bs, aio_context, 1869 block_job_txn, errp); 1870 1871 aio_context_release(aio_context); 1872 } 1873 1874 static void blockdev_backup_commit(void *opaque) 1875 { 1876 BlockdevBackupState *state = opaque; 1877 AioContext *aio_context; 1878 1879 aio_context = bdrv_get_aio_context(state->bs); 1880 aio_context_acquire(aio_context); 1881 1882 assert(state->job); 1883 job_start(&state->job->job); 1884 1885 aio_context_release(aio_context); 1886 } 1887 1888 static void blockdev_backup_abort(void *opaque) 1889 { 1890 BlockdevBackupState *state = opaque; 1891 1892 if (state->job) { 1893 job_cancel_sync(&state->job->job, true); 1894 } 1895 } 1896 1897 static void blockdev_backup_clean(void *opaque) 1898 { 1899 g_autofree BlockdevBackupState *state = opaque; 1900 AioContext *aio_context; 1901 1902 if (!state->bs) { 1903 return; 1904 } 1905 1906 aio_context = bdrv_get_aio_context(state->bs); 1907 aio_context_acquire(aio_context); 1908 1909 bdrv_drained_end(state->bs); 1910 1911 aio_context_release(aio_context); 1912 } 1913 1914 typedef struct BlockDirtyBitmapState { 1915 BdrvDirtyBitmap *bitmap; 1916 BlockDriverState *bs; 1917 HBitmap *backup; 1918 bool was_enabled; 1919 } BlockDirtyBitmapState; 1920 1921 static void block_dirty_bitmap_add_abort(void *opaque); 1922 TransactionActionDrv block_dirty_bitmap_add_drv = { 1923 .abort = block_dirty_bitmap_add_abort, 1924 .clean = g_free, 1925 }; 1926 1927 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action, 1928 Transaction *tran, Error **errp) 1929 { 1930 Error *local_err = NULL; 1931 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1932 1933 tran_add(tran, &block_dirty_bitmap_add_drv, state); 1934 1935 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1936 qmp_block_dirty_bitmap_add(action->node, action->name, 1937 action->has_granularity, action->granularity, 1938 action->has_persistent, action->persistent, 1939 action->has_disabled, action->disabled, 1940 &local_err); 1941 1942 if (!local_err) { 1943 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name, 1944 NULL, &error_abort); 1945 } else { 1946 error_propagate(errp, local_err); 1947 } 1948 } 1949 1950 static void block_dirty_bitmap_add_abort(void *opaque) 1951 { 1952 BlockDirtyBitmapState *state = opaque; 1953 1954 if (state->bitmap) { 1955 bdrv_release_dirty_bitmap(state->bitmap); 1956 } 1957 } 1958 1959 static void block_dirty_bitmap_restore(void *opaque); 1960 static void block_dirty_bitmap_free_backup(void *opaque); 1961 TransactionActionDrv block_dirty_bitmap_clear_drv = { 1962 .abort = block_dirty_bitmap_restore, 1963 .commit = block_dirty_bitmap_free_backup, 1964 .clean = g_free, 1965 }; 1966 1967 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action, 1968 Transaction *tran, Error **errp) 1969 { 1970 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1971 1972 tran_add(tran, &block_dirty_bitmap_clear_drv, state); 1973 1974 state->bitmap = block_dirty_bitmap_lookup(action->node, 1975 action->name, 1976 &state->bs, 1977 errp); 1978 if (!state->bitmap) { 1979 return; 1980 } 1981 1982 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 1983 return; 1984 } 1985 1986 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 1987 } 1988 1989 static void block_dirty_bitmap_restore(void *opaque) 1990 { 1991 BlockDirtyBitmapState *state = opaque; 1992 1993 if (state->backup) { 1994 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 1995 } 1996 } 1997 1998 static void block_dirty_bitmap_free_backup(void *opaque) 1999 { 2000 BlockDirtyBitmapState *state = opaque; 2001 2002 hbitmap_free(state->backup); 2003 } 2004 2005 static void block_dirty_bitmap_enable_abort(void *opaque); 2006 TransactionActionDrv block_dirty_bitmap_enable_drv = { 2007 .abort = block_dirty_bitmap_enable_abort, 2008 .clean = g_free, 2009 }; 2010 2011 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action, 2012 Transaction *tran, Error **errp) 2013 { 2014 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2015 2016 tran_add(tran, &block_dirty_bitmap_enable_drv, state); 2017 2018 state->bitmap = block_dirty_bitmap_lookup(action->node, 2019 action->name, 2020 NULL, 2021 errp); 2022 if (!state->bitmap) { 2023 return; 2024 } 2025 2026 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2027 return; 2028 } 2029 2030 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2031 bdrv_enable_dirty_bitmap(state->bitmap); 2032 } 2033 2034 static void block_dirty_bitmap_enable_abort(void *opaque) 2035 { 2036 BlockDirtyBitmapState *state = opaque; 2037 2038 if (!state->was_enabled) { 2039 bdrv_disable_dirty_bitmap(state->bitmap); 2040 } 2041 } 2042 2043 static void block_dirty_bitmap_disable_abort(void *opaque); 2044 TransactionActionDrv block_dirty_bitmap_disable_drv = { 2045 .abort = block_dirty_bitmap_disable_abort, 2046 .clean = g_free, 2047 }; 2048 2049 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action, 2050 Transaction *tran, Error **errp) 2051 { 2052 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2053 2054 tran_add(tran, &block_dirty_bitmap_disable_drv, state); 2055 2056 state->bitmap = block_dirty_bitmap_lookup(action->node, 2057 action->name, 2058 NULL, 2059 errp); 2060 if (!state->bitmap) { 2061 return; 2062 } 2063 2064 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2065 return; 2066 } 2067 2068 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2069 bdrv_disable_dirty_bitmap(state->bitmap); 2070 } 2071 2072 static void block_dirty_bitmap_disable_abort(void *opaque) 2073 { 2074 BlockDirtyBitmapState *state = opaque; 2075 2076 if (state->was_enabled) { 2077 bdrv_enable_dirty_bitmap(state->bitmap); 2078 } 2079 } 2080 2081 TransactionActionDrv block_dirty_bitmap_merge_drv = { 2082 .commit = block_dirty_bitmap_free_backup, 2083 .abort = block_dirty_bitmap_restore, 2084 .clean = g_free, 2085 }; 2086 2087 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action, 2088 Transaction *tran, Error **errp) 2089 { 2090 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2091 2092 tran_add(tran, &block_dirty_bitmap_merge_drv, state); 2093 2094 state->bitmap = block_dirty_bitmap_merge(action->node, action->target, 2095 action->bitmaps, &state->backup, 2096 errp); 2097 } 2098 2099 static void block_dirty_bitmap_remove_commit(void *opaque); 2100 static void block_dirty_bitmap_remove_abort(void *opaque); 2101 TransactionActionDrv block_dirty_bitmap_remove_drv = { 2102 .commit = block_dirty_bitmap_remove_commit, 2103 .abort = block_dirty_bitmap_remove_abort, 2104 .clean = g_free, 2105 }; 2106 2107 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action, 2108 Transaction *tran, Error **errp) 2109 { 2110 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2111 2112 tran_add(tran, &block_dirty_bitmap_remove_drv, state); 2113 2114 2115 state->bitmap = block_dirty_bitmap_remove(action->node, action->name, 2116 false, &state->bs, errp); 2117 if (state->bitmap) { 2118 bdrv_dirty_bitmap_skip_store(state->bitmap, true); 2119 bdrv_dirty_bitmap_set_busy(state->bitmap, true); 2120 } 2121 } 2122 2123 static void block_dirty_bitmap_remove_abort(void *opaque) 2124 { 2125 BlockDirtyBitmapState *state = opaque; 2126 2127 if (state->bitmap) { 2128 bdrv_dirty_bitmap_skip_store(state->bitmap, false); 2129 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2130 } 2131 } 2132 2133 static void block_dirty_bitmap_remove_commit(void *opaque) 2134 { 2135 BlockDirtyBitmapState *state = opaque; 2136 2137 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2138 bdrv_release_dirty_bitmap(state->bitmap); 2139 } 2140 2141 static void abort_commit(void *opaque); 2142 TransactionActionDrv abort_drv = { 2143 .commit = abort_commit, 2144 }; 2145 2146 static void abort_action(Transaction *tran, Error **errp) 2147 { 2148 tran_add(tran, &abort_drv, NULL); 2149 error_setg(errp, "Transaction aborted using Abort action"); 2150 } 2151 2152 static void abort_commit(void *opaque) 2153 { 2154 g_assert_not_reached(); /* this action never succeeds */ 2155 } 2156 2157 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn, 2158 Transaction *tran, Error **errp) 2159 { 2160 switch (act->type) { 2161 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 2162 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 2163 external_snapshot_action(act, tran, errp); 2164 return; 2165 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP: 2166 drive_backup_action(act->u.drive_backup.data, 2167 block_job_txn, tran, errp); 2168 return; 2169 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP: 2170 blockdev_backup_action(act->u.blockdev_backup.data, 2171 block_job_txn, tran, errp); 2172 return; 2173 case TRANSACTION_ACTION_KIND_ABORT: 2174 abort_action(tran, errp); 2175 return; 2176 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC: 2177 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data, 2178 tran, errp); 2179 return; 2180 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD: 2181 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data, 2182 tran, errp); 2183 return; 2184 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR: 2185 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data, 2186 tran, errp); 2187 return; 2188 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE: 2189 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data, 2190 tran, errp); 2191 return; 2192 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE: 2193 block_dirty_bitmap_disable_action( 2194 act->u.block_dirty_bitmap_disable.data, tran, errp); 2195 return; 2196 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE: 2197 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data, 2198 tran, errp); 2199 return; 2200 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE: 2201 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data, 2202 tran, errp); 2203 return; 2204 /* 2205 * Where are transactions for MIRROR, COMMIT and STREAM? 2206 * Although these blockjobs use transaction callbacks like the backup job, 2207 * these jobs do not necessarily adhere to transaction semantics. 2208 * These jobs may not fully undo all of their actions on abort, nor do they 2209 * necessarily work in transactions with more than one job in them. 2210 */ 2211 case TRANSACTION_ACTION_KIND__MAX: 2212 default: 2213 g_assert_not_reached(); 2214 }; 2215 } 2216 2217 2218 /* 2219 * 'Atomic' group operations. The operations are performed as a set, and if 2220 * any fail then we roll back all operations in the group. 2221 * 2222 * Always run under BQL. 2223 */ 2224 void qmp_transaction(TransactionActionList *actions, 2225 struct TransactionProperties *properties, 2226 Error **errp) 2227 { 2228 TransactionActionList *act; 2229 JobTxn *block_job_txn = NULL; 2230 Error *local_err = NULL; 2231 Transaction *tran; 2232 ActionCompletionMode comp_mode = 2233 properties ? properties->completion_mode : 2234 ACTION_COMPLETION_MODE_INDIVIDUAL; 2235 2236 GLOBAL_STATE_CODE(); 2237 2238 /* Does this transaction get canceled as a group on failure? 2239 * If not, we don't really need to make a JobTxn. 2240 */ 2241 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2242 for (act = actions; act; act = act->next) { 2243 TransactionActionKind type = act->value->type; 2244 2245 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP && 2246 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP) 2247 { 2248 error_setg(errp, 2249 "Action '%s' does not support transaction property " 2250 "completion-mode = %s", 2251 TransactionActionKind_str(type), 2252 ActionCompletionMode_str(comp_mode)); 2253 return; 2254 } 2255 } 2256 2257 block_job_txn = job_txn_new(); 2258 } 2259 2260 /* drain all i/o before any operations */ 2261 bdrv_drain_all(); 2262 2263 tran = tran_new(); 2264 2265 /* We don't do anything in this loop that commits us to the operations */ 2266 for (act = actions; act; act = act->next) { 2267 transaction_action(act->value, block_job_txn, tran, &local_err); 2268 if (local_err) { 2269 error_propagate(errp, local_err); 2270 goto delete_and_fail; 2271 } 2272 } 2273 2274 tran_commit(tran); 2275 2276 /* success */ 2277 goto exit; 2278 2279 delete_and_fail: 2280 /* failure, and it is all-or-none; roll back all operations */ 2281 tran_abort(tran); 2282 exit: 2283 job_txn_unref(block_job_txn); 2284 } 2285 2286 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2287 const char *name, 2288 Error **errp) 2289 { 2290 BdrvDirtyBitmap *bitmap; 2291 BlockDriverState *bs; 2292 BlockDirtyBitmapSha256 *ret = NULL; 2293 char *sha256; 2294 2295 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2296 if (!bitmap || !bs) { 2297 return NULL; 2298 } 2299 2300 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2301 if (sha256 == NULL) { 2302 return NULL; 2303 } 2304 2305 ret = g_new(BlockDirtyBitmapSha256, 1); 2306 ret->sha256 = sha256; 2307 2308 return ret; 2309 } 2310 2311 void coroutine_fn qmp_block_resize(const char *device, const char *node_name, 2312 int64_t size, Error **errp) 2313 { 2314 Error *local_err = NULL; 2315 BlockBackend *blk; 2316 BlockDriverState *bs; 2317 AioContext *old_ctx; 2318 2319 bs = bdrv_lookup_bs(device, node_name, &local_err); 2320 if (local_err) { 2321 error_propagate(errp, local_err); 2322 return; 2323 } 2324 2325 if (size < 0) { 2326 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2327 return; 2328 } 2329 2330 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2331 error_setg(errp, QERR_DEVICE_IN_USE, device); 2332 return; 2333 } 2334 2335 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp); 2336 if (!blk) { 2337 return; 2338 } 2339 2340 bdrv_co_lock(bs); 2341 bdrv_drained_begin(bs); 2342 bdrv_co_unlock(bs); 2343 2344 old_ctx = bdrv_co_enter(bs); 2345 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); 2346 bdrv_co_leave(bs, old_ctx); 2347 2348 bdrv_co_lock(bs); 2349 bdrv_drained_end(bs); 2350 blk_co_unref(blk); 2351 bdrv_co_unlock(bs); 2352 } 2353 2354 void qmp_block_stream(const char *job_id, const char *device, 2355 const char *base, 2356 const char *base_node, 2357 const char *backing_file, 2358 const char *bottom, 2359 bool has_speed, int64_t speed, 2360 bool has_on_error, BlockdevOnError on_error, 2361 const char *filter_node_name, 2362 bool has_auto_finalize, bool auto_finalize, 2363 bool has_auto_dismiss, bool auto_dismiss, 2364 Error **errp) 2365 { 2366 BlockDriverState *bs, *iter, *iter_end; 2367 BlockDriverState *base_bs = NULL; 2368 BlockDriverState *bottom_bs = NULL; 2369 AioContext *aio_context; 2370 Error *local_err = NULL; 2371 int job_flags = JOB_DEFAULT; 2372 2373 if (base && base_node) { 2374 error_setg(errp, "'base' and 'base-node' cannot be specified " 2375 "at the same time"); 2376 return; 2377 } 2378 2379 if (base && bottom) { 2380 error_setg(errp, "'base' and 'bottom' cannot be specified " 2381 "at the same time"); 2382 return; 2383 } 2384 2385 if (bottom && base_node) { 2386 error_setg(errp, "'bottom' and 'base-node' cannot be specified " 2387 "at the same time"); 2388 return; 2389 } 2390 2391 if (!has_on_error) { 2392 on_error = BLOCKDEV_ON_ERROR_REPORT; 2393 } 2394 2395 bs = bdrv_lookup_bs(device, device, errp); 2396 if (!bs) { 2397 return; 2398 } 2399 2400 aio_context = bdrv_get_aio_context(bs); 2401 aio_context_acquire(aio_context); 2402 2403 if (base) { 2404 base_bs = bdrv_find_backing_image(bs, base); 2405 if (base_bs == NULL) { 2406 error_setg(errp, "Can't find '%s' in the backing chain", base); 2407 goto out; 2408 } 2409 assert(bdrv_get_aio_context(base_bs) == aio_context); 2410 } 2411 2412 if (base_node) { 2413 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2414 if (!base_bs) { 2415 goto out; 2416 } 2417 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 2418 error_setg(errp, "Node '%s' is not a backing image of '%s'", 2419 base_node, device); 2420 goto out; 2421 } 2422 assert(bdrv_get_aio_context(base_bs) == aio_context); 2423 bdrv_refresh_filename(base_bs); 2424 } 2425 2426 if (bottom) { 2427 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); 2428 if (!bottom_bs) { 2429 goto out; 2430 } 2431 if (!bottom_bs->drv) { 2432 error_setg(errp, "Node '%s' is not open", bottom); 2433 goto out; 2434 } 2435 if (bottom_bs->drv->is_filter) { 2436 error_setg(errp, "Node '%s' is a filter, use a non-filter node " 2437 "as 'bottom'", bottom); 2438 goto out; 2439 } 2440 if (!bdrv_chain_contains(bs, bottom_bs)) { 2441 error_setg(errp, "Node '%s' is not in a chain starting from '%s'", 2442 bottom, device); 2443 goto out; 2444 } 2445 assert(bdrv_get_aio_context(bottom_bs) == aio_context); 2446 } 2447 2448 /* 2449 * Check for op blockers in the whole chain between bs and base (or bottom) 2450 */ 2451 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; 2452 for (iter = bs; iter && iter != iter_end; 2453 iter = bdrv_filter_or_cow_bs(iter)) 2454 { 2455 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 2456 goto out; 2457 } 2458 } 2459 2460 /* if we are streaming the entire chain, the result will have no backing 2461 * file, and specifying one is therefore an error */ 2462 if (!base_bs && backing_file) { 2463 error_setg(errp, "backing file specified, but streaming the " 2464 "entire chain"); 2465 goto out; 2466 } 2467 2468 if (has_auto_finalize && !auto_finalize) { 2469 job_flags |= JOB_MANUAL_FINALIZE; 2470 } 2471 if (has_auto_dismiss && !auto_dismiss) { 2472 job_flags |= JOB_MANUAL_DISMISS; 2473 } 2474 2475 stream_start(job_id, bs, base_bs, backing_file, 2476 bottom_bs, job_flags, has_speed ? speed : 0, on_error, 2477 filter_node_name, &local_err); 2478 if (local_err) { 2479 error_propagate(errp, local_err); 2480 goto out; 2481 } 2482 2483 trace_qmp_block_stream(bs); 2484 2485 out: 2486 aio_context_release(aio_context); 2487 } 2488 2489 void qmp_block_commit(const char *job_id, const char *device, 2490 const char *base_node, 2491 const char *base, 2492 const char *top_node, 2493 const char *top, 2494 const char *backing_file, 2495 bool has_speed, int64_t speed, 2496 bool has_on_error, BlockdevOnError on_error, 2497 const char *filter_node_name, 2498 bool has_auto_finalize, bool auto_finalize, 2499 bool has_auto_dismiss, bool auto_dismiss, 2500 Error **errp) 2501 { 2502 BlockDriverState *bs; 2503 BlockDriverState *iter; 2504 BlockDriverState *base_bs, *top_bs; 2505 AioContext *aio_context; 2506 Error *local_err = NULL; 2507 int job_flags = JOB_DEFAULT; 2508 uint64_t top_perm, top_shared; 2509 2510 if (!has_speed) { 2511 speed = 0; 2512 } 2513 if (!has_on_error) { 2514 on_error = BLOCKDEV_ON_ERROR_REPORT; 2515 } 2516 if (has_auto_finalize && !auto_finalize) { 2517 job_flags |= JOB_MANUAL_FINALIZE; 2518 } 2519 if (has_auto_dismiss && !auto_dismiss) { 2520 job_flags |= JOB_MANUAL_DISMISS; 2521 } 2522 2523 /* Important Note: 2524 * libvirt relies on the DeviceNotFound error class in order to probe for 2525 * live commit feature versions; for this to work, we must make sure to 2526 * perform the device lookup before any generic errors that may occur in a 2527 * scenario in which all optional arguments are omitted. */ 2528 bs = qmp_get_root_bs(device, &local_err); 2529 if (!bs) { 2530 bs = bdrv_lookup_bs(device, device, NULL); 2531 if (!bs) { 2532 error_free(local_err); 2533 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2534 "Device '%s' not found", device); 2535 } else { 2536 error_propagate(errp, local_err); 2537 } 2538 return; 2539 } 2540 2541 aio_context = bdrv_get_aio_context(bs); 2542 aio_context_acquire(aio_context); 2543 2544 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2545 goto out; 2546 } 2547 2548 /* default top_bs is the active layer */ 2549 top_bs = bs; 2550 2551 if (top_node && top) { 2552 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 2553 goto out; 2554 } else if (top_node) { 2555 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 2556 if (top_bs == NULL) { 2557 goto out; 2558 } 2559 if (!bdrv_chain_contains(bs, top_bs)) { 2560 error_setg(errp, "'%s' is not in this backing file chain", 2561 top_node); 2562 goto out; 2563 } 2564 } else if (top) { 2565 /* This strcmp() is just a shortcut, there is no need to 2566 * refresh @bs's filename. If it mismatches, 2567 * bdrv_find_backing_image() will do the refresh and may still 2568 * return @bs. */ 2569 if (strcmp(bs->filename, top) != 0) { 2570 top_bs = bdrv_find_backing_image(bs, top); 2571 } 2572 } 2573 2574 if (top_bs == NULL) { 2575 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2576 goto out; 2577 } 2578 2579 assert(bdrv_get_aio_context(top_bs) == aio_context); 2580 2581 if (base_node && base) { 2582 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 2583 goto out; 2584 } else if (base_node) { 2585 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2586 if (base_bs == NULL) { 2587 goto out; 2588 } 2589 if (!bdrv_chain_contains(top_bs, base_bs)) { 2590 error_setg(errp, "'%s' is not in this backing file chain", 2591 base_node); 2592 goto out; 2593 } 2594 } else if (base) { 2595 base_bs = bdrv_find_backing_image(top_bs, base); 2596 if (base_bs == NULL) { 2597 error_setg(errp, "Can't find '%s' in the backing chain", base); 2598 goto out; 2599 } 2600 } else { 2601 base_bs = bdrv_find_base(top_bs); 2602 if (base_bs == NULL) { 2603 error_setg(errp, "There is no backimg image"); 2604 goto out; 2605 } 2606 } 2607 2608 assert(bdrv_get_aio_context(base_bs) == aio_context); 2609 2610 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); 2611 iter = bdrv_filter_or_cow_bs(iter)) 2612 { 2613 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2614 goto out; 2615 } 2616 } 2617 2618 /* Do not allow attempts to commit an image into itself */ 2619 if (top_bs == base_bs) { 2620 error_setg(errp, "cannot commit an image into itself"); 2621 goto out; 2622 } 2623 2624 /* 2625 * Active commit is required if and only if someone has taken a 2626 * WRITE permission on the top node. Historically, we have always 2627 * used active commit for top nodes, so continue that practice 2628 * lest we possibly break clients that rely on this behavior, e.g. 2629 * to later attach this node to a writing parent. 2630 * (Active commit is never really wrong.) 2631 */ 2632 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); 2633 if (top_perm & BLK_PERM_WRITE || 2634 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) 2635 { 2636 if (backing_file) { 2637 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { 2638 error_setg(errp, "'backing-file' specified," 2639 " but 'top' is the active layer"); 2640 } else { 2641 error_setg(errp, "'backing-file' specified, but 'top' has a " 2642 "writer on it"); 2643 } 2644 goto out; 2645 } 2646 if (!job_id) { 2647 /* 2648 * Emulate here what block_job_create() does, because it 2649 * is possible that @bs != @top_bs (the block job should 2650 * be named after @bs, even if @top_bs is the actual 2651 * source) 2652 */ 2653 job_id = bdrv_get_device_name(bs); 2654 } 2655 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, 2656 filter_node_name, NULL, NULL, false, &local_err); 2657 } else { 2658 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 2659 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2660 goto out; 2661 } 2662 commit_start(job_id, bs, base_bs, top_bs, job_flags, 2663 speed, on_error, backing_file, 2664 filter_node_name, &local_err); 2665 } 2666 if (local_err != NULL) { 2667 error_propagate(errp, local_err); 2668 goto out; 2669 } 2670 2671 out: 2672 aio_context_release(aio_context); 2673 } 2674 2675 /* Common QMP interface for drive-backup and blockdev-backup */ 2676 static BlockJob *do_backup_common(BackupCommon *backup, 2677 BlockDriverState *bs, 2678 BlockDriverState *target_bs, 2679 AioContext *aio_context, 2680 JobTxn *txn, Error **errp) 2681 { 2682 BlockJob *job = NULL; 2683 BdrvDirtyBitmap *bmap = NULL; 2684 BackupPerf perf = { .max_workers = 64 }; 2685 int job_flags = JOB_DEFAULT; 2686 2687 if (!backup->has_speed) { 2688 backup->speed = 0; 2689 } 2690 if (!backup->has_on_source_error) { 2691 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2692 } 2693 if (!backup->has_on_target_error) { 2694 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2695 } 2696 if (!backup->has_auto_finalize) { 2697 backup->auto_finalize = true; 2698 } 2699 if (!backup->has_auto_dismiss) { 2700 backup->auto_dismiss = true; 2701 } 2702 if (!backup->has_compress) { 2703 backup->compress = false; 2704 } 2705 2706 if (backup->x_perf) { 2707 if (backup->x_perf->has_use_copy_range) { 2708 perf.use_copy_range = backup->x_perf->use_copy_range; 2709 } 2710 if (backup->x_perf->has_max_workers) { 2711 perf.max_workers = backup->x_perf->max_workers; 2712 } 2713 if (backup->x_perf->has_max_chunk) { 2714 perf.max_chunk = backup->x_perf->max_chunk; 2715 } 2716 } 2717 2718 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || 2719 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { 2720 /* done before desugaring 'incremental' to print the right message */ 2721 if (!backup->bitmap) { 2722 error_setg(errp, "must provide a valid bitmap name for " 2723 "'%s' sync mode", MirrorSyncMode_str(backup->sync)); 2724 return NULL; 2725 } 2726 } 2727 2728 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { 2729 if (backup->has_bitmap_mode && 2730 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { 2731 error_setg(errp, "Bitmap sync mode must be '%s' " 2732 "when using sync mode '%s'", 2733 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), 2734 MirrorSyncMode_str(backup->sync)); 2735 return NULL; 2736 } 2737 backup->has_bitmap_mode = true; 2738 backup->sync = MIRROR_SYNC_MODE_BITMAP; 2739 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; 2740 } 2741 2742 if (backup->bitmap) { 2743 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 2744 if (!bmap) { 2745 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 2746 return NULL; 2747 } 2748 if (!backup->has_bitmap_mode) { 2749 error_setg(errp, "Bitmap sync mode must be given " 2750 "when providing a bitmap"); 2751 return NULL; 2752 } 2753 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2754 return NULL; 2755 } 2756 2757 /* This does not produce a useful bitmap artifact: */ 2758 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 2759 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" 2760 " outputs", MirrorSyncMode_str(backup->sync)); 2761 return NULL; 2762 } 2763 2764 /* If the bitmap isn't used for input or output, this is useless: */ 2765 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && 2766 backup->sync != MIRROR_SYNC_MODE_BITMAP) { 2767 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" 2768 " when combined with sync mode '%s'", 2769 BitmapSyncMode_str(backup->bitmap_mode), 2770 MirrorSyncMode_str(backup->sync)); 2771 return NULL; 2772 } 2773 } 2774 2775 if (!backup->bitmap && backup->has_bitmap_mode) { 2776 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); 2777 return NULL; 2778 } 2779 2780 if (!backup->auto_finalize) { 2781 job_flags |= JOB_MANUAL_FINALIZE; 2782 } 2783 if (!backup->auto_dismiss) { 2784 job_flags |= JOB_MANUAL_DISMISS; 2785 } 2786 2787 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 2788 backup->sync, bmap, backup->bitmap_mode, 2789 backup->compress, 2790 backup->filter_node_name, 2791 &perf, 2792 backup->on_source_error, 2793 backup->on_target_error, 2794 job_flags, NULL, NULL, txn, errp); 2795 return job; 2796 } 2797 2798 void qmp_drive_backup(DriveBackup *backup, Error **errp) 2799 { 2800 TransactionAction action = { 2801 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, 2802 .u.drive_backup.data = backup, 2803 }; 2804 blockdev_do_action(&action, errp); 2805 } 2806 2807 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, 2808 bool flat, 2809 Error **errp) 2810 { 2811 bool return_flat = has_flat && flat; 2812 2813 return bdrv_named_nodes_list(return_flat, errp); 2814 } 2815 2816 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 2817 { 2818 return bdrv_get_xdbg_block_graph(errp); 2819 } 2820 2821 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) 2822 { 2823 TransactionAction action = { 2824 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, 2825 .u.blockdev_backup.data = backup, 2826 }; 2827 blockdev_do_action(&action, errp); 2828 } 2829 2830 /* Parameter check and block job starting for drive mirroring. 2831 * Caller should hold @device and @target's aio context (must be the same). 2832 **/ 2833 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 2834 BlockDriverState *target, 2835 const char *replaces, 2836 enum MirrorSyncMode sync, 2837 BlockMirrorBackingMode backing_mode, 2838 bool zero_target, 2839 bool has_speed, int64_t speed, 2840 bool has_granularity, uint32_t granularity, 2841 bool has_buf_size, int64_t buf_size, 2842 bool has_on_source_error, 2843 BlockdevOnError on_source_error, 2844 bool has_on_target_error, 2845 BlockdevOnError on_target_error, 2846 bool has_unmap, bool unmap, 2847 const char *filter_node_name, 2848 bool has_copy_mode, MirrorCopyMode copy_mode, 2849 bool has_auto_finalize, bool auto_finalize, 2850 bool has_auto_dismiss, bool auto_dismiss, 2851 Error **errp) 2852 { 2853 BlockDriverState *unfiltered_bs; 2854 int job_flags = JOB_DEFAULT; 2855 2856 GLOBAL_STATE_CODE(); 2857 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2858 2859 if (!has_speed) { 2860 speed = 0; 2861 } 2862 if (!has_on_source_error) { 2863 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2864 } 2865 if (!has_on_target_error) { 2866 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2867 } 2868 if (!has_granularity) { 2869 granularity = 0; 2870 } 2871 if (!has_buf_size) { 2872 buf_size = 0; 2873 } 2874 if (!has_unmap) { 2875 unmap = true; 2876 } 2877 if (!has_copy_mode) { 2878 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 2879 } 2880 if (has_auto_finalize && !auto_finalize) { 2881 job_flags |= JOB_MANUAL_FINALIZE; 2882 } 2883 if (has_auto_dismiss && !auto_dismiss) { 2884 job_flags |= JOB_MANUAL_DISMISS; 2885 } 2886 2887 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2888 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2889 "a value in range [512B, 64MB]"); 2890 return; 2891 } 2892 if (granularity & (granularity - 1)) { 2893 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2894 "a power of 2"); 2895 return; 2896 } 2897 2898 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2899 return; 2900 } 2901 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 2902 return; 2903 } 2904 2905 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { 2906 sync = MIRROR_SYNC_MODE_FULL; 2907 } 2908 2909 if (!replaces) { 2910 /* We want to mirror from @bs, but keep implicit filters on top */ 2911 unfiltered_bs = bdrv_skip_implicit_filters(bs); 2912 if (unfiltered_bs != bs) { 2913 replaces = unfiltered_bs->node_name; 2914 } 2915 } 2916 2917 if (replaces) { 2918 BlockDriverState *to_replace_bs; 2919 AioContext *replace_aio_context; 2920 int64_t bs_size, replace_size; 2921 2922 bs_size = bdrv_getlength(bs); 2923 if (bs_size < 0) { 2924 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 2925 return; 2926 } 2927 2928 to_replace_bs = check_to_replace_node(bs, replaces, errp); 2929 if (!to_replace_bs) { 2930 return; 2931 } 2932 2933 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2934 aio_context_acquire(replace_aio_context); 2935 replace_size = bdrv_getlength(to_replace_bs); 2936 aio_context_release(replace_aio_context); 2937 2938 if (replace_size < 0) { 2939 error_setg_errno(errp, -replace_size, 2940 "Failed to query the replacement node's size"); 2941 return; 2942 } 2943 if (bs_size != replace_size) { 2944 error_setg(errp, "cannot replace image with a mirror image of " 2945 "different size"); 2946 return; 2947 } 2948 } 2949 2950 /* pass the node name to replace to mirror start since it's loose coupling 2951 * and will allow to check whether the node still exist at mirror completion 2952 */ 2953 mirror_start(job_id, bs, target, 2954 replaces, job_flags, 2955 speed, granularity, buf_size, sync, backing_mode, zero_target, 2956 on_source_error, on_target_error, unmap, filter_node_name, 2957 copy_mode, errp); 2958 } 2959 2960 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 2961 { 2962 BlockDriverState *bs; 2963 BlockDriverState *target_backing_bs, *target_bs; 2964 AioContext *aio_context; 2965 AioContext *old_context; 2966 BlockMirrorBackingMode backing_mode; 2967 Error *local_err = NULL; 2968 QDict *options = NULL; 2969 int flags; 2970 int64_t size; 2971 const char *format = arg->format; 2972 bool zero_target; 2973 int ret; 2974 2975 bs = qmp_get_root_bs(arg->device, errp); 2976 if (!bs) { 2977 return; 2978 } 2979 2980 /* Early check to avoid creating target */ 2981 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2982 return; 2983 } 2984 2985 aio_context = bdrv_get_aio_context(bs); 2986 aio_context_acquire(aio_context); 2987 2988 if (!arg->has_mode) { 2989 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2990 } 2991 2992 if (!arg->format) { 2993 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 2994 ? NULL : bs->drv->format_name); 2995 } 2996 2997 flags = bs->open_flags | BDRV_O_RDWR; 2998 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); 2999 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { 3000 arg->sync = MIRROR_SYNC_MODE_FULL; 3001 } 3002 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3003 target_backing_bs = bs; 3004 } 3005 3006 size = bdrv_getlength(bs); 3007 if (size < 0) { 3008 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3009 goto out; 3010 } 3011 3012 if (arg->replaces) { 3013 if (!arg->node_name) { 3014 error_setg(errp, "a node-name must be provided when replacing a" 3015 " named node of the graph"); 3016 goto out; 3017 } 3018 } 3019 3020 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3021 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3022 } else { 3023 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3024 } 3025 3026 /* Don't open backing image in create() */ 3027 flags |= BDRV_O_NO_BACKING; 3028 3029 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) 3030 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3031 { 3032 /* create new image w/o backing file */ 3033 assert(format); 3034 bdrv_img_create(arg->target, format, 3035 NULL, NULL, NULL, size, flags, false, &local_err); 3036 } else { 3037 /* Implicit filters should not appear in the filename */ 3038 BlockDriverState *explicit_backing = 3039 bdrv_skip_implicit_filters(target_backing_bs); 3040 3041 switch (arg->mode) { 3042 case NEW_IMAGE_MODE_EXISTING: 3043 break; 3044 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3045 /* create new image with backing file */ 3046 bdrv_refresh_filename(explicit_backing); 3047 bdrv_img_create(arg->target, format, 3048 explicit_backing->filename, 3049 explicit_backing->drv->format_name, 3050 NULL, size, flags, false, &local_err); 3051 break; 3052 default: 3053 abort(); 3054 } 3055 } 3056 3057 if (local_err) { 3058 error_propagate(errp, local_err); 3059 goto out; 3060 } 3061 3062 options = qdict_new(); 3063 if (arg->node_name) { 3064 qdict_put_str(options, "node-name", arg->node_name); 3065 } 3066 if (format) { 3067 qdict_put_str(options, "driver", format); 3068 } 3069 3070 /* Mirroring takes care of copy-on-write using the source's backing 3071 * file. 3072 */ 3073 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3074 if (!target_bs) { 3075 goto out; 3076 } 3077 3078 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && 3079 (arg->mode == NEW_IMAGE_MODE_EXISTING || 3080 !bdrv_has_zero_init(target_bs))); 3081 3082 3083 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 3084 old_context = bdrv_get_aio_context(target_bs); 3085 aio_context_release(aio_context); 3086 aio_context_acquire(old_context); 3087 3088 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3089 if (ret < 0) { 3090 bdrv_unref(target_bs); 3091 aio_context_release(old_context); 3092 return; 3093 } 3094 3095 aio_context_release(old_context); 3096 aio_context_acquire(aio_context); 3097 3098 blockdev_mirror_common(arg->job_id, bs, target_bs, 3099 arg->replaces, arg->sync, 3100 backing_mode, zero_target, 3101 arg->has_speed, arg->speed, 3102 arg->has_granularity, arg->granularity, 3103 arg->has_buf_size, arg->buf_size, 3104 arg->has_on_source_error, arg->on_source_error, 3105 arg->has_on_target_error, arg->on_target_error, 3106 arg->has_unmap, arg->unmap, 3107 NULL, 3108 arg->has_copy_mode, arg->copy_mode, 3109 arg->has_auto_finalize, arg->auto_finalize, 3110 arg->has_auto_dismiss, arg->auto_dismiss, 3111 errp); 3112 bdrv_unref(target_bs); 3113 out: 3114 aio_context_release(aio_context); 3115 } 3116 3117 void qmp_blockdev_mirror(const char *job_id, 3118 const char *device, const char *target, 3119 const char *replaces, 3120 MirrorSyncMode sync, 3121 bool has_speed, int64_t speed, 3122 bool has_granularity, uint32_t granularity, 3123 bool has_buf_size, int64_t buf_size, 3124 bool has_on_source_error, 3125 BlockdevOnError on_source_error, 3126 bool has_on_target_error, 3127 BlockdevOnError on_target_error, 3128 const char *filter_node_name, 3129 bool has_copy_mode, MirrorCopyMode copy_mode, 3130 bool has_auto_finalize, bool auto_finalize, 3131 bool has_auto_dismiss, bool auto_dismiss, 3132 Error **errp) 3133 { 3134 BlockDriverState *bs; 3135 BlockDriverState *target_bs; 3136 AioContext *aio_context; 3137 AioContext *old_context; 3138 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3139 bool zero_target; 3140 int ret; 3141 3142 bs = qmp_get_root_bs(device, errp); 3143 if (!bs) { 3144 return; 3145 } 3146 3147 target_bs = bdrv_lookup_bs(target, target, errp); 3148 if (!target_bs) { 3149 return; 3150 } 3151 3152 zero_target = (sync == MIRROR_SYNC_MODE_FULL); 3153 3154 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 3155 old_context = bdrv_get_aio_context(target_bs); 3156 aio_context = bdrv_get_aio_context(bs); 3157 aio_context_acquire(old_context); 3158 3159 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3160 3161 aio_context_release(old_context); 3162 aio_context_acquire(aio_context); 3163 3164 if (ret < 0) { 3165 goto out; 3166 } 3167 3168 blockdev_mirror_common(job_id, bs, target_bs, 3169 replaces, sync, backing_mode, 3170 zero_target, has_speed, speed, 3171 has_granularity, granularity, 3172 has_buf_size, buf_size, 3173 has_on_source_error, on_source_error, 3174 has_on_target_error, on_target_error, 3175 true, true, filter_node_name, 3176 has_copy_mode, copy_mode, 3177 has_auto_finalize, auto_finalize, 3178 has_auto_dismiss, auto_dismiss, 3179 errp); 3180 out: 3181 aio_context_release(aio_context); 3182 } 3183 3184 /* 3185 * Get a block job using its ID. Called with job_mutex held. 3186 */ 3187 static BlockJob *find_block_job_locked(const char *id, Error **errp) 3188 { 3189 BlockJob *job; 3190 3191 assert(id != NULL); 3192 3193 job = block_job_get_locked(id); 3194 3195 if (!job) { 3196 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3197 "Block job '%s' not found", id); 3198 return NULL; 3199 } 3200 3201 return job; 3202 } 3203 3204 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3205 { 3206 BlockJob *job; 3207 3208 JOB_LOCK_GUARD(); 3209 job = find_block_job_locked(device, errp); 3210 3211 if (!job) { 3212 return; 3213 } 3214 3215 block_job_set_speed_locked(job, speed, errp); 3216 } 3217 3218 void qmp_block_job_cancel(const char *device, 3219 bool has_force, bool force, Error **errp) 3220 { 3221 BlockJob *job; 3222 3223 JOB_LOCK_GUARD(); 3224 job = find_block_job_locked(device, errp); 3225 3226 if (!job) { 3227 return; 3228 } 3229 3230 if (!has_force) { 3231 force = false; 3232 } 3233 3234 if (job_user_paused_locked(&job->job) && !force) { 3235 error_setg(errp, "The block job for device '%s' is currently paused", 3236 device); 3237 return; 3238 } 3239 3240 trace_qmp_block_job_cancel(job); 3241 job_user_cancel_locked(&job->job, force, errp); 3242 } 3243 3244 void qmp_block_job_pause(const char *device, Error **errp) 3245 { 3246 BlockJob *job; 3247 3248 JOB_LOCK_GUARD(); 3249 job = find_block_job_locked(device, errp); 3250 3251 if (!job) { 3252 return; 3253 } 3254 3255 trace_qmp_block_job_pause(job); 3256 job_user_pause_locked(&job->job, errp); 3257 } 3258 3259 void qmp_block_job_resume(const char *device, Error **errp) 3260 { 3261 BlockJob *job; 3262 3263 JOB_LOCK_GUARD(); 3264 job = find_block_job_locked(device, errp); 3265 3266 if (!job) { 3267 return; 3268 } 3269 3270 trace_qmp_block_job_resume(job); 3271 job_user_resume_locked(&job->job, errp); 3272 } 3273 3274 void qmp_block_job_complete(const char *device, Error **errp) 3275 { 3276 BlockJob *job; 3277 3278 JOB_LOCK_GUARD(); 3279 job = find_block_job_locked(device, errp); 3280 3281 if (!job) { 3282 return; 3283 } 3284 3285 trace_qmp_block_job_complete(job); 3286 job_complete_locked(&job->job, errp); 3287 } 3288 3289 void qmp_block_job_finalize(const char *id, Error **errp) 3290 { 3291 BlockJob *job; 3292 3293 JOB_LOCK_GUARD(); 3294 job = find_block_job_locked(id, errp); 3295 3296 if (!job) { 3297 return; 3298 } 3299 3300 trace_qmp_block_job_finalize(job); 3301 job_ref_locked(&job->job); 3302 job_finalize_locked(&job->job, errp); 3303 3304 job_unref_locked(&job->job); 3305 } 3306 3307 void qmp_block_job_dismiss(const char *id, Error **errp) 3308 { 3309 BlockJob *bjob; 3310 Job *job; 3311 3312 JOB_LOCK_GUARD(); 3313 bjob = find_block_job_locked(id, errp); 3314 3315 if (!bjob) { 3316 return; 3317 } 3318 3319 trace_qmp_block_job_dismiss(bjob); 3320 job = &bjob->job; 3321 job_dismiss_locked(&job, errp); 3322 } 3323 3324 void qmp_change_backing_file(const char *device, 3325 const char *image_node_name, 3326 const char *backing_file, 3327 Error **errp) 3328 { 3329 BlockDriverState *bs = NULL; 3330 AioContext *aio_context; 3331 BlockDriverState *image_bs = NULL; 3332 Error *local_err = NULL; 3333 bool ro; 3334 int ret; 3335 3336 bs = qmp_get_root_bs(device, errp); 3337 if (!bs) { 3338 return; 3339 } 3340 3341 aio_context = bdrv_get_aio_context(bs); 3342 aio_context_acquire(aio_context); 3343 3344 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3345 if (local_err) { 3346 error_propagate(errp, local_err); 3347 goto out; 3348 } 3349 3350 if (!image_bs) { 3351 error_setg(errp, "image file not found"); 3352 goto out; 3353 } 3354 3355 if (bdrv_find_base(image_bs) == image_bs) { 3356 error_setg(errp, "not allowing backing file change on an image " 3357 "without a backing file"); 3358 goto out; 3359 } 3360 3361 /* even though we are not necessarily operating on bs, we need it to 3362 * determine if block ops are currently prohibited on the chain */ 3363 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3364 goto out; 3365 } 3366 3367 /* final sanity check */ 3368 if (!bdrv_chain_contains(bs, image_bs)) { 3369 error_setg(errp, "'%s' and image file are not in the same chain", 3370 device); 3371 goto out; 3372 } 3373 3374 /* if not r/w, reopen to make r/w */ 3375 ro = bdrv_is_read_only(image_bs); 3376 3377 if (ro) { 3378 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 3379 goto out; 3380 } 3381 } 3382 3383 ret = bdrv_change_backing_file(image_bs, backing_file, 3384 image_bs->drv ? image_bs->drv->format_name : "", 3385 false); 3386 3387 if (ret < 0) { 3388 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3389 backing_file); 3390 /* don't exit here, so we can try to restore open flags if 3391 * appropriate */ 3392 } 3393 3394 if (ro) { 3395 bdrv_reopen_set_read_only(image_bs, true, errp); 3396 } 3397 3398 out: 3399 aio_context_release(aio_context); 3400 } 3401 3402 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3403 { 3404 BlockDriverState *bs; 3405 QObject *obj; 3406 Visitor *v = qobject_output_visitor_new(&obj); 3407 QDict *qdict; 3408 3409 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3410 visit_complete(v, &obj); 3411 qdict = qobject_to(QDict, obj); 3412 3413 qdict_flatten(qdict); 3414 3415 if (!qdict_get_try_str(qdict, "node-name")) { 3416 error_setg(errp, "'node-name' must be specified for the root node"); 3417 goto fail; 3418 } 3419 3420 bs = bds_tree_init(qdict, errp); 3421 if (!bs) { 3422 goto fail; 3423 } 3424 3425 bdrv_set_monitor_owned(bs); 3426 3427 fail: 3428 visit_free(v); 3429 } 3430 3431 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp) 3432 { 3433 BlockReopenQueue *queue = NULL; 3434 3435 /* Add each one of the BDS that we want to reopen to the queue */ 3436 for (; reopen_list != NULL; reopen_list = reopen_list->next) { 3437 BlockdevOptions *options = reopen_list->value; 3438 BlockDriverState *bs; 3439 AioContext *ctx; 3440 QObject *obj; 3441 Visitor *v; 3442 QDict *qdict; 3443 3444 /* Check for the selected node name */ 3445 if (!options->node_name) { 3446 error_setg(errp, "node-name not specified"); 3447 goto fail; 3448 } 3449 3450 bs = bdrv_find_node(options->node_name); 3451 if (!bs) { 3452 error_setg(errp, "Failed to find node with node-name='%s'", 3453 options->node_name); 3454 goto fail; 3455 } 3456 3457 /* Put all options in a QDict and flatten it */ 3458 v = qobject_output_visitor_new(&obj); 3459 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3460 visit_complete(v, &obj); 3461 visit_free(v); 3462 3463 qdict = qobject_to(QDict, obj); 3464 3465 qdict_flatten(qdict); 3466 3467 ctx = bdrv_get_aio_context(bs); 3468 aio_context_acquire(ctx); 3469 3470 queue = bdrv_reopen_queue(queue, bs, qdict, false); 3471 3472 aio_context_release(ctx); 3473 } 3474 3475 /* Perform the reopen operation */ 3476 bdrv_reopen_multiple(queue, errp); 3477 queue = NULL; 3478 3479 fail: 3480 bdrv_reopen_queue_free(queue); 3481 } 3482 3483 void qmp_blockdev_del(const char *node_name, Error **errp) 3484 { 3485 AioContext *aio_context; 3486 BlockDriverState *bs; 3487 3488 GLOBAL_STATE_CODE(); 3489 3490 bs = bdrv_find_node(node_name); 3491 if (!bs) { 3492 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3493 return; 3494 } 3495 if (bdrv_has_blk(bs)) { 3496 error_setg(errp, "Node %s is in use", node_name); 3497 return; 3498 } 3499 aio_context = bdrv_get_aio_context(bs); 3500 aio_context_acquire(aio_context); 3501 3502 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 3503 goto out; 3504 } 3505 3506 if (!QTAILQ_IN_USE(bs, monitor_list)) { 3507 error_setg(errp, "Node %s is not owned by the monitor", 3508 bs->node_name); 3509 goto out; 3510 } 3511 3512 if (bs->refcnt > 1) { 3513 error_setg(errp, "Block device %s is in use", 3514 bdrv_get_device_or_node_name(bs)); 3515 goto out; 3516 } 3517 3518 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 3519 bdrv_unref(bs); 3520 3521 out: 3522 aio_context_release(aio_context); 3523 } 3524 3525 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 3526 const char *child_name) 3527 { 3528 BdrvChild *child; 3529 3530 QLIST_FOREACH(child, &parent_bs->children, next) { 3531 if (strcmp(child->name, child_name) == 0) { 3532 return child; 3533 } 3534 } 3535 3536 return NULL; 3537 } 3538 3539 void qmp_x_blockdev_change(const char *parent, const char *child, 3540 const char *node, Error **errp) 3541 { 3542 BlockDriverState *parent_bs, *new_bs = NULL; 3543 BdrvChild *p_child; 3544 3545 parent_bs = bdrv_lookup_bs(parent, parent, errp); 3546 if (!parent_bs) { 3547 return; 3548 } 3549 3550 if (!child == !node) { 3551 if (child) { 3552 error_setg(errp, "The parameters child and node are in conflict"); 3553 } else { 3554 error_setg(errp, "Either child or node must be specified"); 3555 } 3556 return; 3557 } 3558 3559 if (child) { 3560 p_child = bdrv_find_child(parent_bs, child); 3561 if (!p_child) { 3562 error_setg(errp, "Node '%s' does not have child '%s'", 3563 parent, child); 3564 return; 3565 } 3566 bdrv_del_child(parent_bs, p_child, errp); 3567 } 3568 3569 if (node) { 3570 new_bs = bdrv_find_node(node); 3571 if (!new_bs) { 3572 error_setg(errp, "Node '%s' not found", node); 3573 return; 3574 } 3575 bdrv_add_child(parent_bs, new_bs, errp); 3576 } 3577 } 3578 3579 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3580 { 3581 BlockJobInfoList *head = NULL, **tail = &head; 3582 BlockJob *job; 3583 3584 JOB_LOCK_GUARD(); 3585 3586 for (job = block_job_next_locked(NULL); job; 3587 job = block_job_next_locked(job)) { 3588 BlockJobInfo *value; 3589 3590 if (block_job_is_internal(job)) { 3591 continue; 3592 } 3593 value = block_job_query_locked(job, errp); 3594 if (!value) { 3595 qapi_free_BlockJobInfoList(head); 3596 return NULL; 3597 } 3598 QAPI_LIST_APPEND(tail, value); 3599 } 3600 3601 return head; 3602 } 3603 3604 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 3605 bool has_force, bool force, Error **errp) 3606 { 3607 AioContext *old_context; 3608 AioContext *new_context; 3609 BlockDriverState *bs; 3610 3611 bs = bdrv_find_node(node_name); 3612 if (!bs) { 3613 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3614 return; 3615 } 3616 3617 /* Protects against accidents. */ 3618 if (!(has_force && force) && bdrv_has_blk(bs)) { 3619 error_setg(errp, "Node %s is associated with a BlockBackend and could " 3620 "be in use (use force=true to override this check)", 3621 node_name); 3622 return; 3623 } 3624 3625 if (iothread->type == QTYPE_QSTRING) { 3626 IOThread *obj = iothread_by_id(iothread->u.s); 3627 if (!obj) { 3628 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 3629 return; 3630 } 3631 3632 new_context = iothread_get_aio_context(obj); 3633 } else { 3634 new_context = qemu_get_aio_context(); 3635 } 3636 3637 old_context = bdrv_get_aio_context(bs); 3638 aio_context_acquire(old_context); 3639 3640 bdrv_try_change_aio_context(bs, new_context, NULL, errp); 3641 3642 aio_context_release(old_context); 3643 } 3644 3645 QemuOptsList qemu_common_drive_opts = { 3646 .name = "drive", 3647 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3648 .desc = { 3649 { 3650 .name = "snapshot", 3651 .type = QEMU_OPT_BOOL, 3652 .help = "enable/disable snapshot mode", 3653 },{ 3654 .name = "aio", 3655 .type = QEMU_OPT_STRING, 3656 .help = "host AIO implementation (threads, native, io_uring)", 3657 },{ 3658 .name = BDRV_OPT_CACHE_WB, 3659 .type = QEMU_OPT_BOOL, 3660 .help = "Enable writeback mode", 3661 },{ 3662 .name = "format", 3663 .type = QEMU_OPT_STRING, 3664 .help = "disk format (raw, qcow2, ...)", 3665 },{ 3666 .name = "rerror", 3667 .type = QEMU_OPT_STRING, 3668 .help = "read error action", 3669 },{ 3670 .name = "werror", 3671 .type = QEMU_OPT_STRING, 3672 .help = "write error action", 3673 },{ 3674 .name = BDRV_OPT_READ_ONLY, 3675 .type = QEMU_OPT_BOOL, 3676 .help = "open drive file as read-only", 3677 }, 3678 3679 THROTTLE_OPTS, 3680 3681 { 3682 .name = "throttling.group", 3683 .type = QEMU_OPT_STRING, 3684 .help = "name of the block throttling group", 3685 },{ 3686 .name = "copy-on-read", 3687 .type = QEMU_OPT_BOOL, 3688 .help = "copy read data from backing file into image file", 3689 },{ 3690 .name = "detect-zeroes", 3691 .type = QEMU_OPT_STRING, 3692 .help = "try to optimize zero writes (off, on, unmap)", 3693 },{ 3694 .name = "stats-account-invalid", 3695 .type = QEMU_OPT_BOOL, 3696 .help = "whether to account for invalid I/O operations " 3697 "in the statistics", 3698 },{ 3699 .name = "stats-account-failed", 3700 .type = QEMU_OPT_BOOL, 3701 .help = "whether to account for failed I/O operations " 3702 "in the statistics", 3703 }, 3704 { /* end of list */ } 3705 }, 3706 }; 3707 3708 QemuOptsList qemu_drive_opts = { 3709 .name = "drive", 3710 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3711 .desc = { 3712 /* 3713 * no elements => accept any params 3714 * validation will happen later 3715 */ 3716 { /* end of list */ } 3717 }, 3718 }; 3719