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 or IF_XEN, because it gets desugared into 259 * -device, 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_XEN || 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 uint64_t length; 345 const char *str = qstring_get_str(qobject_to(QString, 346 entry->value)); 347 if (parse_uint_full(str, 10, &length) == 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 bdrv_unref(bs); 689 } 690 } 691 692 /* Iterates over the list of monitor-owned BlockDriverStates */ 693 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 694 { 695 GLOBAL_STATE_CODE(); 696 return bs ? QTAILQ_NEXT(bs, monitor_list) 697 : QTAILQ_FIRST(&monitor_bdrv_states); 698 } 699 700 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 701 Error **errp) 702 { 703 const char *value; 704 705 value = qemu_opt_get(opts, from); 706 if (value) { 707 if (qemu_opt_find(opts, to)) { 708 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 709 "same time", to, from); 710 return false; 711 } 712 } 713 714 /* rename all items in opts */ 715 while ((value = qemu_opt_get(opts, from))) { 716 qemu_opt_set(opts, to, value, &error_abort); 717 qemu_opt_unset(opts, from); 718 } 719 return true; 720 } 721 722 QemuOptsList qemu_legacy_drive_opts = { 723 .name = "drive", 724 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 725 .desc = { 726 { 727 .name = "bus", 728 .type = QEMU_OPT_NUMBER, 729 .help = "bus number", 730 },{ 731 .name = "unit", 732 .type = QEMU_OPT_NUMBER, 733 .help = "unit number (i.e. lun for scsi)", 734 },{ 735 .name = "index", 736 .type = QEMU_OPT_NUMBER, 737 .help = "index number", 738 },{ 739 .name = "media", 740 .type = QEMU_OPT_STRING, 741 .help = "media type (disk, cdrom)", 742 },{ 743 .name = "if", 744 .type = QEMU_OPT_STRING, 745 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 746 },{ 747 .name = "file", 748 .type = QEMU_OPT_STRING, 749 .help = "file name", 750 }, 751 752 /* Options that are passed on, but have special semantics with -drive */ 753 { 754 .name = BDRV_OPT_READ_ONLY, 755 .type = QEMU_OPT_BOOL, 756 .help = "open drive file as read-only", 757 },{ 758 .name = "rerror", 759 .type = QEMU_OPT_STRING, 760 .help = "read error action", 761 },{ 762 .name = "werror", 763 .type = QEMU_OPT_STRING, 764 .help = "write error action", 765 },{ 766 .name = "copy-on-read", 767 .type = QEMU_OPT_BOOL, 768 .help = "copy read data from backing file into image file", 769 }, 770 771 { /* end of list */ } 772 }, 773 }; 774 775 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 776 Error **errp) 777 { 778 const char *value; 779 BlockBackend *blk; 780 DriveInfo *dinfo = NULL; 781 QDict *bs_opts; 782 QemuOpts *legacy_opts; 783 DriveMediaType media = MEDIA_DISK; 784 BlockInterfaceType type; 785 int max_devs, bus_id, unit_id, index; 786 const char *werror, *rerror; 787 bool read_only = false; 788 bool copy_on_read; 789 const char *filename; 790 int i; 791 792 GLOBAL_STATE_CODE(); 793 794 /* Change legacy command line options into QMP ones */ 795 static const struct { 796 const char *from; 797 const char *to; 798 } opt_renames[] = { 799 { "iops", "throttling.iops-total" }, 800 { "iops_rd", "throttling.iops-read" }, 801 { "iops_wr", "throttling.iops-write" }, 802 803 { "bps", "throttling.bps-total" }, 804 { "bps_rd", "throttling.bps-read" }, 805 { "bps_wr", "throttling.bps-write" }, 806 807 { "iops_max", "throttling.iops-total-max" }, 808 { "iops_rd_max", "throttling.iops-read-max" }, 809 { "iops_wr_max", "throttling.iops-write-max" }, 810 811 { "bps_max", "throttling.bps-total-max" }, 812 { "bps_rd_max", "throttling.bps-read-max" }, 813 { "bps_wr_max", "throttling.bps-write-max" }, 814 815 { "iops_size", "throttling.iops-size" }, 816 817 { "group", "throttling.group" }, 818 819 { "readonly", BDRV_OPT_READ_ONLY }, 820 }; 821 822 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 823 if (!qemu_opt_rename(all_opts, opt_renames[i].from, 824 opt_renames[i].to, errp)) { 825 return NULL; 826 } 827 } 828 829 value = qemu_opt_get(all_opts, "cache"); 830 if (value) { 831 int flags = 0; 832 bool writethrough; 833 834 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 835 error_setg(errp, "invalid cache option"); 836 return NULL; 837 } 838 839 /* Specific options take precedence */ 840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 842 !writethrough, &error_abort); 843 } 844 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 845 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 846 !!(flags & BDRV_O_NOCACHE), &error_abort); 847 } 848 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 849 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 850 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 851 } 852 qemu_opt_unset(all_opts, "cache"); 853 } 854 855 /* Get a QDict for processing the options */ 856 bs_opts = qdict_new(); 857 qemu_opts_to_qdict(all_opts, bs_opts); 858 859 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 860 &error_abort); 861 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) { 862 goto fail; 863 } 864 865 /* Media type */ 866 value = qemu_opt_get(legacy_opts, "media"); 867 if (value) { 868 if (!strcmp(value, "disk")) { 869 media = MEDIA_DISK; 870 } else if (!strcmp(value, "cdrom")) { 871 media = MEDIA_CDROM; 872 read_only = true; 873 } else { 874 error_setg(errp, "'%s' invalid media", value); 875 goto fail; 876 } 877 } 878 879 /* copy-on-read is disabled with a warning for read-only devices */ 880 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 881 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 882 883 if (read_only && copy_on_read) { 884 warn_report("disabling copy-on-read on read-only drive"); 885 copy_on_read = false; 886 } 887 888 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 889 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 890 891 /* Controller type */ 892 value = qemu_opt_get(legacy_opts, "if"); 893 if (value) { 894 for (type = 0; 895 type < IF_COUNT && strcmp(value, if_name[type]); 896 type++) { 897 } 898 if (type == IF_COUNT) { 899 error_setg(errp, "unsupported bus type '%s'", value); 900 goto fail; 901 } 902 } else { 903 type = block_default_type; 904 } 905 906 /* Device address specified by bus/unit or index. 907 * If none was specified, try to find the first free one. */ 908 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 909 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 910 index = qemu_opt_get_number(legacy_opts, "index", -1); 911 912 max_devs = if_max_devs[type]; 913 914 if (index != -1) { 915 if (bus_id != 0 || unit_id != -1) { 916 error_setg(errp, "index cannot be used with bus and unit"); 917 goto fail; 918 } 919 bus_id = drive_index_to_bus_id(type, index); 920 unit_id = drive_index_to_unit_id(type, index); 921 } 922 923 if (unit_id == -1) { 924 unit_id = 0; 925 while (drive_get(type, bus_id, unit_id) != NULL) { 926 unit_id++; 927 if (max_devs && unit_id >= max_devs) { 928 unit_id -= max_devs; 929 bus_id++; 930 } 931 } 932 } 933 934 if (max_devs && unit_id >= max_devs) { 935 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 936 goto fail; 937 } 938 939 if (drive_get(type, bus_id, unit_id) != NULL) { 940 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 941 bus_id, unit_id, index); 942 goto fail; 943 } 944 945 /* no id supplied -> create one */ 946 if (qemu_opts_id(all_opts) == NULL) { 947 char *new_id; 948 const char *mediastr = ""; 949 if (type == IF_IDE || type == IF_SCSI) { 950 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 951 } 952 if (max_devs) { 953 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 954 mediastr, unit_id); 955 } else { 956 new_id = g_strdup_printf("%s%s%i", if_name[type], 957 mediastr, unit_id); 958 } 959 qdict_put_str(bs_opts, "id", new_id); 960 g_free(new_id); 961 } 962 963 /* Add virtio block device */ 964 if (type == IF_VIRTIO) { 965 QemuOpts *devopts; 966 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 967 &error_abort); 968 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort); 969 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 970 &error_abort); 971 } else if (type == IF_XEN) { 972 QemuOpts *devopts; 973 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 974 &error_abort); 975 qemu_opt_set(devopts, "driver", 976 (media == MEDIA_CDROM) ? "xen-cdrom" : "xen-disk", 977 &error_abort); 978 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 979 &error_abort); 980 } 981 982 filename = qemu_opt_get(legacy_opts, "file"); 983 984 /* Check werror/rerror compatibility with if=... */ 985 werror = qemu_opt_get(legacy_opts, "werror"); 986 if (werror != NULL) { 987 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 988 type != IF_NONE) { 989 error_setg(errp, "werror is not supported by this bus type"); 990 goto fail; 991 } 992 qdict_put_str(bs_opts, "werror", werror); 993 } 994 995 rerror = qemu_opt_get(legacy_opts, "rerror"); 996 if (rerror != NULL) { 997 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 998 type != IF_NONE) { 999 error_setg(errp, "rerror is not supported by this bus type"); 1000 goto fail; 1001 } 1002 qdict_put_str(bs_opts, "rerror", rerror); 1003 } 1004 1005 /* Actual block device init: Functionality shared with blockdev-add */ 1006 blk = blockdev_init(filename, bs_opts, errp); 1007 bs_opts = NULL; 1008 if (!blk) { 1009 goto fail; 1010 } 1011 1012 /* Create legacy DriveInfo */ 1013 dinfo = g_malloc0(sizeof(*dinfo)); 1014 dinfo->opts = all_opts; 1015 1016 dinfo->type = type; 1017 dinfo->bus = bus_id; 1018 dinfo->unit = unit_id; 1019 1020 blk_set_legacy_dinfo(blk, dinfo); 1021 1022 switch(type) { 1023 case IF_IDE: 1024 case IF_SCSI: 1025 case IF_XEN: 1026 case IF_NONE: 1027 dinfo->media_cd = media == MEDIA_CDROM; 1028 break; 1029 default: 1030 break; 1031 } 1032 1033 fail: 1034 qemu_opts_del(legacy_opts); 1035 qobject_unref(bs_opts); 1036 return dinfo; 1037 } 1038 1039 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1040 { 1041 BlockDriverState *bs; 1042 1043 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1044 1045 bs = bdrv_lookup_bs(name, name, errp); 1046 if (bs == NULL) { 1047 return NULL; 1048 } 1049 1050 if (!bdrv_is_root_node(bs)) { 1051 error_setg(errp, "Need a root block node"); 1052 return NULL; 1053 } 1054 1055 if (!bdrv_is_inserted(bs)) { 1056 error_setg(errp, "Device has no medium"); 1057 bs = NULL; 1058 } 1059 1060 return bs; 1061 } 1062 1063 static void blockdev_do_action(TransactionAction *action, Error **errp) 1064 { 1065 TransactionActionList list; 1066 1067 list.value = action; 1068 list.next = NULL; 1069 qmp_transaction(&list, NULL, errp); 1070 } 1071 1072 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name, 1073 const char *snapshot_file, 1074 const char *snapshot_node_name, 1075 const char *format, 1076 bool has_mode, NewImageMode mode, Error **errp) 1077 { 1078 BlockdevSnapshotSync snapshot = { 1079 .device = (char *) device, 1080 .node_name = (char *) node_name, 1081 .snapshot_file = (char *) snapshot_file, 1082 .snapshot_node_name = (char *) snapshot_node_name, 1083 .format = (char *) format, 1084 .has_mode = has_mode, 1085 .mode = mode, 1086 }; 1087 TransactionAction action = { 1088 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1089 .u.blockdev_snapshot_sync.data = &snapshot, 1090 }; 1091 blockdev_do_action(&action, errp); 1092 } 1093 1094 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1095 Error **errp) 1096 { 1097 BlockdevSnapshot snapshot_data = { 1098 .node = (char *) node, 1099 .overlay = (char *) overlay 1100 }; 1101 TransactionAction action = { 1102 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1103 .u.blockdev_snapshot.data = &snapshot_data, 1104 }; 1105 blockdev_do_action(&action, errp); 1106 } 1107 1108 void qmp_blockdev_snapshot_internal_sync(const char *device, 1109 const char *name, 1110 Error **errp) 1111 { 1112 BlockdevSnapshotInternal snapshot = { 1113 .device = (char *) device, 1114 .name = (char *) name 1115 }; 1116 TransactionAction action = { 1117 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1118 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1119 }; 1120 blockdev_do_action(&action, errp); 1121 } 1122 1123 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1124 const char *id, 1125 const char *name, 1126 Error **errp) 1127 { 1128 BlockDriverState *bs; 1129 QEMUSnapshotInfo sn; 1130 Error *local_err = NULL; 1131 SnapshotInfo *info = NULL; 1132 int ret; 1133 1134 GLOBAL_STATE_CODE(); 1135 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1136 1137 bs = qmp_get_root_bs(device, errp); 1138 if (!bs) { 1139 return NULL; 1140 } 1141 1142 if (!id && !name) { 1143 error_setg(errp, "Name or id must be provided"); 1144 return NULL; 1145 } 1146 1147 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1148 return NULL; 1149 } 1150 1151 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1152 if (local_err) { 1153 error_propagate(errp, local_err); 1154 return NULL; 1155 } 1156 if (!ret) { 1157 error_setg(errp, 1158 "Snapshot with id '%s' and name '%s' does not exist on " 1159 "device '%s'", 1160 STR_OR_NULL(id), STR_OR_NULL(name), device); 1161 return NULL; 1162 } 1163 1164 bdrv_snapshot_delete(bs, id, name, &local_err); 1165 if (local_err) { 1166 error_propagate(errp, local_err); 1167 return NULL; 1168 } 1169 1170 info = g_new0(SnapshotInfo, 1); 1171 info->id = g_strdup(sn.id_str); 1172 info->name = g_strdup(sn.name); 1173 info->date_nsec = sn.date_nsec; 1174 info->date_sec = sn.date_sec; 1175 info->vm_state_size = sn.vm_state_size; 1176 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1177 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1178 if (sn.icount != -1ULL) { 1179 info->icount = sn.icount; 1180 info->has_icount = true; 1181 } 1182 1183 return info; 1184 } 1185 1186 /* internal snapshot private data */ 1187 typedef struct InternalSnapshotState { 1188 BlockDriverState *bs; 1189 QEMUSnapshotInfo sn; 1190 bool created; 1191 } InternalSnapshotState; 1192 1193 static void internal_snapshot_abort(void *opaque); 1194 static void internal_snapshot_clean(void *opaque); 1195 TransactionActionDrv internal_snapshot_drv = { 1196 .abort = internal_snapshot_abort, 1197 .clean = internal_snapshot_clean, 1198 }; 1199 1200 static void internal_snapshot_action(BlockdevSnapshotInternal *internal, 1201 Transaction *tran, Error **errp) 1202 { 1203 Error *local_err = NULL; 1204 const char *device; 1205 const char *name; 1206 BlockDriverState *bs; 1207 QEMUSnapshotInfo old_sn, *sn; 1208 bool ret; 1209 int64_t rt; 1210 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1); 1211 int ret1; 1212 1213 GLOBAL_STATE_CODE(); 1214 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1215 1216 tran_add(tran, &internal_snapshot_drv, state); 1217 1218 device = internal->device; 1219 name = internal->name; 1220 1221 bs = qmp_get_root_bs(device, errp); 1222 if (!bs) { 1223 return; 1224 } 1225 1226 state->bs = bs; 1227 1228 /* Paired with .clean() */ 1229 bdrv_drained_begin(bs); 1230 1231 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1232 return; 1233 } 1234 1235 if (bdrv_is_read_only(bs)) { 1236 error_setg(errp, "Device '%s' is read only", device); 1237 return; 1238 } 1239 1240 if (!bdrv_can_snapshot(bs)) { 1241 error_setg(errp, "Block format '%s' used by device '%s' " 1242 "does not support internal snapshots", 1243 bs->drv->format_name, device); 1244 return; 1245 } 1246 1247 if (!strlen(name)) { 1248 error_setg(errp, "Name is empty"); 1249 return; 1250 } 1251 1252 /* check whether a snapshot with name exist */ 1253 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1254 &local_err); 1255 if (local_err) { 1256 error_propagate(errp, local_err); 1257 return; 1258 } else if (ret) { 1259 error_setg(errp, 1260 "Snapshot with name '%s' already exists on device '%s'", 1261 name, device); 1262 return; 1263 } 1264 1265 /* 3. take the snapshot */ 1266 sn = &state->sn; 1267 pstrcpy(sn->name, sizeof(sn->name), name); 1268 rt = g_get_real_time(); 1269 sn->date_sec = rt / G_USEC_PER_SEC; 1270 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000; 1271 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1272 if (replay_mode != REPLAY_MODE_NONE) { 1273 sn->icount = replay_get_current_icount(); 1274 } else { 1275 sn->icount = -1ULL; 1276 } 1277 1278 ret1 = bdrv_snapshot_create(bs, sn); 1279 if (ret1 < 0) { 1280 error_setg_errno(errp, -ret1, 1281 "Failed to create snapshot '%s' on device '%s'", 1282 name, device); 1283 return; 1284 } 1285 1286 /* 4. succeed, mark a snapshot is created */ 1287 state->created = true; 1288 } 1289 1290 static void internal_snapshot_abort(void *opaque) 1291 { 1292 InternalSnapshotState *state = opaque; 1293 BlockDriverState *bs = state->bs; 1294 QEMUSnapshotInfo *sn = &state->sn; 1295 Error *local_error = NULL; 1296 1297 GLOBAL_STATE_CODE(); 1298 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1299 1300 if (!state->created) { 1301 return; 1302 } 1303 1304 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1305 error_reportf_err(local_error, 1306 "Failed to delete snapshot with id '%s' and " 1307 "name '%s' on device '%s' in abort: ", 1308 sn->id_str, sn->name, 1309 bdrv_get_device_name(bs)); 1310 } 1311 } 1312 1313 static void internal_snapshot_clean(void *opaque) 1314 { 1315 g_autofree InternalSnapshotState *state = opaque; 1316 1317 if (!state->bs) { 1318 return; 1319 } 1320 1321 bdrv_drained_end(state->bs); 1322 } 1323 1324 /* external snapshot private data */ 1325 typedef struct ExternalSnapshotState { 1326 BlockDriverState *old_bs; 1327 BlockDriverState *new_bs; 1328 bool overlay_appended; 1329 } ExternalSnapshotState; 1330 1331 static void external_snapshot_commit(void *opaque); 1332 static void external_snapshot_abort(void *opaque); 1333 static void external_snapshot_clean(void *opaque); 1334 TransactionActionDrv external_snapshot_drv = { 1335 .commit = external_snapshot_commit, 1336 .abort = external_snapshot_abort, 1337 .clean = external_snapshot_clean, 1338 }; 1339 1340 static void external_snapshot_action(TransactionAction *action, 1341 Transaction *tran, Error **errp) 1342 { 1343 int ret; 1344 int flags = 0; 1345 QDict *options = NULL; 1346 Error *local_err = NULL; 1347 /* Device and node name of the image to generate the snapshot from */ 1348 const char *device; 1349 const char *node_name; 1350 /* Reference to the new image (for 'blockdev-snapshot') */ 1351 const char *snapshot_ref; 1352 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1353 const char *new_image_file; 1354 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1); 1355 uint64_t perm, shared; 1356 1357 /* TODO We'll eventually have to take a writer lock in this function */ 1358 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1359 1360 tran_add(tran, &external_snapshot_drv, state); 1361 1362 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1363 * purpose but a different set of parameters */ 1364 switch (action->type) { 1365 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1366 { 1367 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1368 device = s->node; 1369 node_name = s->node; 1370 new_image_file = NULL; 1371 snapshot_ref = s->overlay; 1372 } 1373 break; 1374 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1375 { 1376 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1377 device = s->device; 1378 node_name = s->node_name; 1379 new_image_file = s->snapshot_file; 1380 snapshot_ref = NULL; 1381 } 1382 break; 1383 default: 1384 g_assert_not_reached(); 1385 } 1386 1387 /* start processing */ 1388 1389 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1390 if (!state->old_bs) { 1391 return; 1392 } 1393 1394 /* Paired with .clean() */ 1395 bdrv_drained_begin(state->old_bs); 1396 1397 if (!bdrv_is_inserted(state->old_bs)) { 1398 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, 1399 bdrv_get_device_or_node_name(state->old_bs)); 1400 return; 1401 } 1402 1403 if (bdrv_op_is_blocked(state->old_bs, 1404 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1405 return; 1406 } 1407 1408 if (!bdrv_is_read_only(state->old_bs)) { 1409 if (bdrv_flush(state->old_bs)) { 1410 error_setg(errp, QERR_IO_ERROR); 1411 return; 1412 } 1413 } 1414 1415 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1416 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1417 const char *format = s->format ?: "qcow2"; 1418 enum NewImageMode mode; 1419 const char *snapshot_node_name = s->snapshot_node_name; 1420 1421 if (node_name && !snapshot_node_name) { 1422 error_setg(errp, "New overlay node-name missing"); 1423 return; 1424 } 1425 1426 if (snapshot_node_name && 1427 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1428 error_setg(errp, "New overlay node-name already in use"); 1429 return; 1430 } 1431 1432 flags = state->old_bs->open_flags; 1433 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1434 flags |= BDRV_O_NO_BACKING; 1435 1436 /* create new image w/backing file */ 1437 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1438 if (mode != NEW_IMAGE_MODE_EXISTING) { 1439 int64_t size = bdrv_getlength(state->old_bs); 1440 if (size < 0) { 1441 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1442 return; 1443 } 1444 bdrv_refresh_filename(state->old_bs); 1445 1446 bdrv_img_create(new_image_file, format, 1447 state->old_bs->filename, 1448 state->old_bs->drv->format_name, 1449 NULL, size, flags, false, &local_err); 1450 1451 if (local_err) { 1452 error_propagate(errp, local_err); 1453 return; 1454 } 1455 } 1456 1457 options = qdict_new(); 1458 if (snapshot_node_name) { 1459 qdict_put_str(options, "node-name", snapshot_node_name); 1460 } 1461 qdict_put_str(options, "driver", format); 1462 } 1463 1464 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1465 errp); 1466 1467 /* We will manually add the backing_hd field to the bs later */ 1468 if (!state->new_bs) { 1469 return; 1470 } 1471 1472 /* 1473 * Allow attaching a backing file to an overlay that's already in use only 1474 * if the parents don't assume that they are already seeing a valid image. 1475 * (Specifically, allow it as a mirror target, which is write-only access.) 1476 */ 1477 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); 1478 if (perm & BLK_PERM_CONSISTENT_READ) { 1479 error_setg(errp, "The overlay is already in use"); 1480 return; 1481 } 1482 1483 if (state->new_bs->drv->is_filter) { 1484 error_setg(errp, "Filters cannot be used as overlays"); 1485 return; 1486 } 1487 1488 if (bdrv_cow_child(state->new_bs)) { 1489 error_setg(errp, "The overlay already has a backing image"); 1490 return; 1491 } 1492 1493 if (!state->new_bs->drv->supports_backing) { 1494 error_setg(errp, "The overlay does not support backing images"); 1495 return; 1496 } 1497 1498 ret = bdrv_append(state->new_bs, state->old_bs, errp); 1499 if (ret < 0) { 1500 return; 1501 } 1502 state->overlay_appended = true; 1503 } 1504 1505 static void external_snapshot_commit(void *opaque) 1506 { 1507 ExternalSnapshotState *state = opaque; 1508 1509 /* We don't need (or want) to use the transactional 1510 * bdrv_reopen_multiple() across all the entries at once, because we 1511 * don't want to abort all of them if one of them fails the reopen */ 1512 if (!qatomic_read(&state->old_bs->copy_on_read)) { 1513 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1514 } 1515 } 1516 1517 static void external_snapshot_abort(void *opaque) 1518 { 1519 ExternalSnapshotState *state = opaque; 1520 if (state->new_bs) { 1521 if (state->overlay_appended) { 1522 AioContext *aio_context; 1523 AioContext *tmp_context; 1524 int ret; 1525 1526 aio_context = bdrv_get_aio_context(state->old_bs); 1527 1528 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1529 close state->old_bs; we need it */ 1530 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1531 1532 /* 1533 * The call to bdrv_set_backing_hd() above returns state->old_bs to 1534 * the main AioContext. As we're still going to be using it, return 1535 * it to the AioContext it was before. 1536 */ 1537 tmp_context = bdrv_get_aio_context(state->old_bs); 1538 if (aio_context != tmp_context) { 1539 ret = bdrv_try_change_aio_context(state->old_bs, 1540 aio_context, NULL, NULL); 1541 assert(ret == 0); 1542 } 1543 1544 bdrv_drained_begin(state->new_bs); 1545 bdrv_graph_wrlock(); 1546 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1547 bdrv_graph_wrunlock(); 1548 bdrv_drained_end(state->new_bs); 1549 1550 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1551 } 1552 } 1553 } 1554 1555 static void external_snapshot_clean(void *opaque) 1556 { 1557 g_autofree ExternalSnapshotState *state = opaque; 1558 1559 if (!state->old_bs) { 1560 return; 1561 } 1562 1563 bdrv_drained_end(state->old_bs); 1564 bdrv_unref(state->new_bs); 1565 } 1566 1567 typedef struct DriveBackupState { 1568 BlockDriverState *bs; 1569 BlockJob *job; 1570 } DriveBackupState; 1571 1572 static BlockJob *do_backup_common(BackupCommon *backup, 1573 BlockDriverState *bs, 1574 BlockDriverState *target_bs, 1575 AioContext *aio_context, 1576 JobTxn *txn, Error **errp); 1577 1578 static void drive_backup_commit(void *opaque); 1579 static void drive_backup_abort(void *opaque); 1580 static void drive_backup_clean(void *opaque); 1581 TransactionActionDrv drive_backup_drv = { 1582 .commit = drive_backup_commit, 1583 .abort = drive_backup_abort, 1584 .clean = drive_backup_clean, 1585 }; 1586 1587 static void drive_backup_action(DriveBackup *backup, 1588 JobTxn *block_job_txn, 1589 Transaction *tran, Error **errp) 1590 { 1591 DriveBackupState *state = g_new0(DriveBackupState, 1); 1592 BlockDriverState *bs; 1593 BlockDriverState *target_bs; 1594 BlockDriverState *source = NULL; 1595 AioContext *aio_context; 1596 const char *format; 1597 QDict *options; 1598 Error *local_err = NULL; 1599 int flags; 1600 int64_t size; 1601 bool set_backing_hd = false; 1602 int ret; 1603 1604 GLOBAL_STATE_CODE(); 1605 1606 tran_add(tran, &drive_backup_drv, state); 1607 1608 if (!backup->has_mode) { 1609 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1610 } 1611 1612 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1613 if (!bs) { 1614 return; 1615 } 1616 1617 if (!bs->drv) { 1618 error_setg(errp, "Device has no medium"); 1619 return; 1620 } 1621 1622 aio_context = bdrv_get_aio_context(bs); 1623 1624 state->bs = bs; 1625 /* Paired with .clean() */ 1626 bdrv_drained_begin(bs); 1627 1628 format = backup->format; 1629 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) { 1630 format = bs->drv->format_name; 1631 } 1632 1633 /* Early check to avoid creating target */ 1634 bdrv_graph_rdlock_main_loop(); 1635 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 1636 bdrv_graph_rdunlock_main_loop(); 1637 return; 1638 } 1639 1640 flags = bs->open_flags | BDRV_O_RDWR; 1641 1642 /* 1643 * See if we have a backing HD we can use to create our new image 1644 * on top of. 1645 */ 1646 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 1647 /* 1648 * Backup will not replace the source by the target, so none 1649 * of the filters skipped here will be removed (in contrast to 1650 * mirror). Therefore, we can skip all of them when looking 1651 * for the first COW relationship. 1652 */ 1653 source = bdrv_cow_bs(bdrv_skip_filters(bs)); 1654 if (!source) { 1655 backup->sync = MIRROR_SYNC_MODE_FULL; 1656 } 1657 } 1658 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 1659 source = bs; 1660 flags |= BDRV_O_NO_BACKING; 1661 set_backing_hd = true; 1662 } 1663 bdrv_graph_rdunlock_main_loop(); 1664 1665 size = bdrv_getlength(bs); 1666 if (size < 0) { 1667 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1668 return; 1669 } 1670 1671 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 1672 assert(format); 1673 if (source) { 1674 /* Implicit filters should not appear in the filename */ 1675 BlockDriverState *explicit_backing; 1676 1677 bdrv_graph_rdlock_main_loop(); 1678 explicit_backing = bdrv_skip_implicit_filters(source); 1679 bdrv_refresh_filename(explicit_backing); 1680 bdrv_graph_rdunlock_main_loop(); 1681 1682 bdrv_img_create(backup->target, format, 1683 explicit_backing->filename, 1684 explicit_backing->drv->format_name, NULL, 1685 size, flags, false, &local_err); 1686 } else { 1687 bdrv_img_create(backup->target, format, NULL, NULL, NULL, 1688 size, flags, false, &local_err); 1689 } 1690 } 1691 1692 if (local_err) { 1693 error_propagate(errp, local_err); 1694 return; 1695 } 1696 1697 options = qdict_new(); 1698 qdict_put_str(options, "discard", "unmap"); 1699 qdict_put_str(options, "detect-zeroes", "unmap"); 1700 if (format) { 1701 qdict_put_str(options, "driver", format); 1702 } 1703 1704 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 1705 if (!target_bs) { 1706 return; 1707 } 1708 1709 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1710 if (ret < 0) { 1711 bdrv_unref(target_bs); 1712 return; 1713 } 1714 1715 if (set_backing_hd) { 1716 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { 1717 goto unref; 1718 } 1719 } 1720 1721 state->job = do_backup_common(qapi_DriveBackup_base(backup), 1722 bs, target_bs, aio_context, 1723 block_job_txn, errp); 1724 1725 unref: 1726 bdrv_unref(target_bs); 1727 } 1728 1729 static void drive_backup_commit(void *opaque) 1730 { 1731 DriveBackupState *state = opaque; 1732 1733 assert(state->job); 1734 job_start(&state->job->job); 1735 } 1736 1737 static void drive_backup_abort(void *opaque) 1738 { 1739 DriveBackupState *state = opaque; 1740 1741 if (state->job) { 1742 job_cancel_sync(&state->job->job, true); 1743 } 1744 } 1745 1746 static void drive_backup_clean(void *opaque) 1747 { 1748 g_autofree DriveBackupState *state = opaque; 1749 1750 if (!state->bs) { 1751 return; 1752 } 1753 1754 bdrv_drained_end(state->bs); 1755 } 1756 1757 typedef struct BlockdevBackupState { 1758 BlockDriverState *bs; 1759 BlockJob *job; 1760 } BlockdevBackupState; 1761 1762 static void blockdev_backup_commit(void *opaque); 1763 static void blockdev_backup_abort(void *opaque); 1764 static void blockdev_backup_clean(void *opaque); 1765 TransactionActionDrv blockdev_backup_drv = { 1766 .commit = blockdev_backup_commit, 1767 .abort = blockdev_backup_abort, 1768 .clean = blockdev_backup_clean, 1769 }; 1770 1771 static void blockdev_backup_action(BlockdevBackup *backup, 1772 JobTxn *block_job_txn, 1773 Transaction *tran, Error **errp) 1774 { 1775 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1); 1776 BlockDriverState *bs; 1777 BlockDriverState *target_bs; 1778 AioContext *aio_context; 1779 int ret; 1780 1781 tran_add(tran, &blockdev_backup_drv, state); 1782 1783 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1784 if (!bs) { 1785 return; 1786 } 1787 1788 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 1789 if (!target_bs) { 1790 return; 1791 } 1792 1793 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1794 aio_context = bdrv_get_aio_context(bs); 1795 1796 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1797 if (ret < 0) { 1798 return; 1799 } 1800 1801 state->bs = bs; 1802 1803 /* Paired with .clean() */ 1804 bdrv_drained_begin(state->bs); 1805 1806 state->job = do_backup_common(qapi_BlockdevBackup_base(backup), 1807 bs, target_bs, aio_context, 1808 block_job_txn, errp); 1809 } 1810 1811 static void blockdev_backup_commit(void *opaque) 1812 { 1813 BlockdevBackupState *state = opaque; 1814 1815 assert(state->job); 1816 job_start(&state->job->job); 1817 } 1818 1819 static void blockdev_backup_abort(void *opaque) 1820 { 1821 BlockdevBackupState *state = opaque; 1822 1823 if (state->job) { 1824 job_cancel_sync(&state->job->job, true); 1825 } 1826 } 1827 1828 static void blockdev_backup_clean(void *opaque) 1829 { 1830 g_autofree BlockdevBackupState *state = opaque; 1831 1832 if (!state->bs) { 1833 return; 1834 } 1835 1836 bdrv_drained_end(state->bs); 1837 } 1838 1839 typedef struct BlockDirtyBitmapState { 1840 BdrvDirtyBitmap *bitmap; 1841 BlockDriverState *bs; 1842 HBitmap *backup; 1843 bool was_enabled; 1844 } BlockDirtyBitmapState; 1845 1846 static void block_dirty_bitmap_add_abort(void *opaque); 1847 TransactionActionDrv block_dirty_bitmap_add_drv = { 1848 .abort = block_dirty_bitmap_add_abort, 1849 .clean = g_free, 1850 }; 1851 1852 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action, 1853 Transaction *tran, Error **errp) 1854 { 1855 Error *local_err = NULL; 1856 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1857 1858 tran_add(tran, &block_dirty_bitmap_add_drv, state); 1859 1860 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1861 qmp_block_dirty_bitmap_add(action->node, action->name, 1862 action->has_granularity, action->granularity, 1863 action->has_persistent, action->persistent, 1864 action->has_disabled, action->disabled, 1865 &local_err); 1866 1867 if (!local_err) { 1868 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name, 1869 NULL, &error_abort); 1870 } else { 1871 error_propagate(errp, local_err); 1872 } 1873 } 1874 1875 static void block_dirty_bitmap_add_abort(void *opaque) 1876 { 1877 BlockDirtyBitmapState *state = opaque; 1878 1879 if (state->bitmap) { 1880 bdrv_release_dirty_bitmap(state->bitmap); 1881 } 1882 } 1883 1884 static void block_dirty_bitmap_restore(void *opaque); 1885 static void block_dirty_bitmap_free_backup(void *opaque); 1886 TransactionActionDrv block_dirty_bitmap_clear_drv = { 1887 .abort = block_dirty_bitmap_restore, 1888 .commit = block_dirty_bitmap_free_backup, 1889 .clean = g_free, 1890 }; 1891 1892 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action, 1893 Transaction *tran, Error **errp) 1894 { 1895 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1896 1897 tran_add(tran, &block_dirty_bitmap_clear_drv, state); 1898 1899 state->bitmap = block_dirty_bitmap_lookup(action->node, 1900 action->name, 1901 &state->bs, 1902 errp); 1903 if (!state->bitmap) { 1904 return; 1905 } 1906 1907 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 1908 return; 1909 } 1910 1911 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 1912 } 1913 1914 static void block_dirty_bitmap_restore(void *opaque) 1915 { 1916 BlockDirtyBitmapState *state = opaque; 1917 1918 if (state->backup) { 1919 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 1920 } 1921 } 1922 1923 static void block_dirty_bitmap_free_backup(void *opaque) 1924 { 1925 BlockDirtyBitmapState *state = opaque; 1926 1927 hbitmap_free(state->backup); 1928 } 1929 1930 static void block_dirty_bitmap_enable_abort(void *opaque); 1931 TransactionActionDrv block_dirty_bitmap_enable_drv = { 1932 .abort = block_dirty_bitmap_enable_abort, 1933 .clean = g_free, 1934 }; 1935 1936 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action, 1937 Transaction *tran, Error **errp) 1938 { 1939 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1940 1941 tran_add(tran, &block_dirty_bitmap_enable_drv, state); 1942 1943 state->bitmap = block_dirty_bitmap_lookup(action->node, 1944 action->name, 1945 NULL, 1946 errp); 1947 if (!state->bitmap) { 1948 return; 1949 } 1950 1951 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 1952 return; 1953 } 1954 1955 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 1956 bdrv_enable_dirty_bitmap(state->bitmap); 1957 } 1958 1959 static void block_dirty_bitmap_enable_abort(void *opaque) 1960 { 1961 BlockDirtyBitmapState *state = opaque; 1962 1963 if (!state->was_enabled) { 1964 bdrv_disable_dirty_bitmap(state->bitmap); 1965 } 1966 } 1967 1968 static void block_dirty_bitmap_disable_abort(void *opaque); 1969 TransactionActionDrv block_dirty_bitmap_disable_drv = { 1970 .abort = block_dirty_bitmap_disable_abort, 1971 .clean = g_free, 1972 }; 1973 1974 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action, 1975 Transaction *tran, Error **errp) 1976 { 1977 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1978 1979 tran_add(tran, &block_dirty_bitmap_disable_drv, state); 1980 1981 state->bitmap = block_dirty_bitmap_lookup(action->node, 1982 action->name, 1983 NULL, 1984 errp); 1985 if (!state->bitmap) { 1986 return; 1987 } 1988 1989 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 1990 return; 1991 } 1992 1993 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 1994 bdrv_disable_dirty_bitmap(state->bitmap); 1995 } 1996 1997 static void block_dirty_bitmap_disable_abort(void *opaque) 1998 { 1999 BlockDirtyBitmapState *state = opaque; 2000 2001 if (state->was_enabled) { 2002 bdrv_enable_dirty_bitmap(state->bitmap); 2003 } 2004 } 2005 2006 TransactionActionDrv block_dirty_bitmap_merge_drv = { 2007 .commit = block_dirty_bitmap_free_backup, 2008 .abort = block_dirty_bitmap_restore, 2009 .clean = g_free, 2010 }; 2011 2012 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action, 2013 Transaction *tran, Error **errp) 2014 { 2015 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2016 2017 tran_add(tran, &block_dirty_bitmap_merge_drv, state); 2018 2019 state->bitmap = block_dirty_bitmap_merge(action->node, action->target, 2020 action->bitmaps, &state->backup, 2021 errp); 2022 } 2023 2024 static void block_dirty_bitmap_remove_commit(void *opaque); 2025 static void block_dirty_bitmap_remove_abort(void *opaque); 2026 TransactionActionDrv block_dirty_bitmap_remove_drv = { 2027 .commit = block_dirty_bitmap_remove_commit, 2028 .abort = block_dirty_bitmap_remove_abort, 2029 .clean = g_free, 2030 }; 2031 2032 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action, 2033 Transaction *tran, Error **errp) 2034 { 2035 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2036 2037 tran_add(tran, &block_dirty_bitmap_remove_drv, state); 2038 2039 2040 state->bitmap = block_dirty_bitmap_remove(action->node, action->name, 2041 false, &state->bs, errp); 2042 if (state->bitmap) { 2043 bdrv_dirty_bitmap_skip_store(state->bitmap, true); 2044 bdrv_dirty_bitmap_set_busy(state->bitmap, true); 2045 } 2046 } 2047 2048 static void block_dirty_bitmap_remove_abort(void *opaque) 2049 { 2050 BlockDirtyBitmapState *state = opaque; 2051 2052 if (state->bitmap) { 2053 bdrv_dirty_bitmap_skip_store(state->bitmap, false); 2054 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2055 } 2056 } 2057 2058 static void block_dirty_bitmap_remove_commit(void *opaque) 2059 { 2060 BlockDirtyBitmapState *state = opaque; 2061 2062 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2063 bdrv_release_dirty_bitmap(state->bitmap); 2064 } 2065 2066 static void abort_commit(void *opaque); 2067 TransactionActionDrv abort_drv = { 2068 .commit = abort_commit, 2069 }; 2070 2071 static void abort_action(Transaction *tran, Error **errp) 2072 { 2073 tran_add(tran, &abort_drv, NULL); 2074 error_setg(errp, "Transaction aborted using Abort action"); 2075 } 2076 2077 static void abort_commit(void *opaque) 2078 { 2079 g_assert_not_reached(); /* this action never succeeds */ 2080 } 2081 2082 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn, 2083 Transaction *tran, Error **errp) 2084 { 2085 switch (act->type) { 2086 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 2087 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 2088 external_snapshot_action(act, tran, errp); 2089 return; 2090 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP: 2091 drive_backup_action(act->u.drive_backup.data, 2092 block_job_txn, tran, errp); 2093 return; 2094 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP: 2095 blockdev_backup_action(act->u.blockdev_backup.data, 2096 block_job_txn, tran, errp); 2097 return; 2098 case TRANSACTION_ACTION_KIND_ABORT: 2099 abort_action(tran, errp); 2100 return; 2101 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC: 2102 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data, 2103 tran, errp); 2104 return; 2105 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD: 2106 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data, 2107 tran, errp); 2108 return; 2109 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR: 2110 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data, 2111 tran, errp); 2112 return; 2113 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE: 2114 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data, 2115 tran, errp); 2116 return; 2117 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE: 2118 block_dirty_bitmap_disable_action( 2119 act->u.block_dirty_bitmap_disable.data, tran, errp); 2120 return; 2121 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE: 2122 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data, 2123 tran, errp); 2124 return; 2125 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE: 2126 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data, 2127 tran, errp); 2128 return; 2129 /* 2130 * Where are transactions for MIRROR, COMMIT and STREAM? 2131 * Although these blockjobs use transaction callbacks like the backup job, 2132 * these jobs do not necessarily adhere to transaction semantics. 2133 * These jobs may not fully undo all of their actions on abort, nor do they 2134 * necessarily work in transactions with more than one job in them. 2135 */ 2136 case TRANSACTION_ACTION_KIND__MAX: 2137 default: 2138 g_assert_not_reached(); 2139 }; 2140 } 2141 2142 2143 /* 2144 * 'Atomic' group operations. The operations are performed as a set, and if 2145 * any fail then we roll back all operations in the group. 2146 * 2147 * Always run under BQL. 2148 */ 2149 void qmp_transaction(TransactionActionList *actions, 2150 struct TransactionProperties *properties, 2151 Error **errp) 2152 { 2153 TransactionActionList *act; 2154 JobTxn *block_job_txn = NULL; 2155 Error *local_err = NULL; 2156 Transaction *tran; 2157 ActionCompletionMode comp_mode = 2158 properties ? properties->completion_mode : 2159 ACTION_COMPLETION_MODE_INDIVIDUAL; 2160 2161 GLOBAL_STATE_CODE(); 2162 2163 /* Does this transaction get canceled as a group on failure? 2164 * If not, we don't really need to make a JobTxn. 2165 */ 2166 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2167 for (act = actions; act; act = act->next) { 2168 TransactionActionKind type = act->value->type; 2169 2170 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP && 2171 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP) 2172 { 2173 error_setg(errp, 2174 "Action '%s' does not support transaction property " 2175 "completion-mode = %s", 2176 TransactionActionKind_str(type), 2177 ActionCompletionMode_str(comp_mode)); 2178 return; 2179 } 2180 } 2181 2182 block_job_txn = job_txn_new(); 2183 } 2184 2185 /* drain all i/o before any operations */ 2186 bdrv_drain_all(); 2187 2188 tran = tran_new(); 2189 2190 /* We don't do anything in this loop that commits us to the operations */ 2191 for (act = actions; act; act = act->next) { 2192 transaction_action(act->value, block_job_txn, tran, &local_err); 2193 if (local_err) { 2194 error_propagate(errp, local_err); 2195 goto delete_and_fail; 2196 } 2197 } 2198 2199 tran_commit(tran); 2200 2201 /* success */ 2202 goto exit; 2203 2204 delete_and_fail: 2205 /* failure, and it is all-or-none; roll back all operations */ 2206 tran_abort(tran); 2207 exit: 2208 job_txn_unref(block_job_txn); 2209 } 2210 2211 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2212 const char *name, 2213 Error **errp) 2214 { 2215 BdrvDirtyBitmap *bitmap; 2216 BlockDriverState *bs; 2217 BlockDirtyBitmapSha256 *ret = NULL; 2218 char *sha256; 2219 2220 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2221 if (!bitmap || !bs) { 2222 return NULL; 2223 } 2224 2225 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2226 if (sha256 == NULL) { 2227 return NULL; 2228 } 2229 2230 ret = g_new(BlockDirtyBitmapSha256, 1); 2231 ret->sha256 = sha256; 2232 2233 return ret; 2234 } 2235 2236 void coroutine_fn qmp_block_resize(const char *device, const char *node_name, 2237 int64_t size, Error **errp) 2238 { 2239 Error *local_err = NULL; 2240 BlockBackend *blk; 2241 BlockDriverState *bs; 2242 AioContext *old_ctx; 2243 2244 bs = bdrv_lookup_bs(device, node_name, &local_err); 2245 if (local_err) { 2246 error_propagate(errp, local_err); 2247 return; 2248 } 2249 2250 if (size < 0) { 2251 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2252 return; 2253 } 2254 2255 bdrv_graph_co_rdlock(); 2256 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, errp)) { 2257 bdrv_graph_co_rdunlock(); 2258 return; 2259 } 2260 bdrv_graph_co_rdunlock(); 2261 2262 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp); 2263 if (!blk) { 2264 return; 2265 } 2266 2267 bdrv_drained_begin(bs); 2268 2269 old_ctx = bdrv_co_enter(bs); 2270 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); 2271 bdrv_co_leave(bs, old_ctx); 2272 2273 bdrv_drained_end(bs); 2274 blk_co_unref(blk); 2275 } 2276 2277 void qmp_block_stream(const char *job_id, const char *device, 2278 const char *base, 2279 const char *base_node, 2280 const char *backing_file, 2281 bool has_backing_mask_protocol, 2282 bool backing_mask_protocol, 2283 const char *bottom, 2284 bool has_speed, int64_t speed, 2285 bool has_on_error, BlockdevOnError on_error, 2286 const char *filter_node_name, 2287 bool has_auto_finalize, bool auto_finalize, 2288 bool has_auto_dismiss, bool auto_dismiss, 2289 Error **errp) 2290 { 2291 BlockDriverState *bs, *iter, *iter_end; 2292 BlockDriverState *base_bs = NULL; 2293 BlockDriverState *bottom_bs = NULL; 2294 AioContext *aio_context; 2295 Error *local_err = NULL; 2296 int job_flags = JOB_DEFAULT; 2297 2298 GLOBAL_STATE_CODE(); 2299 2300 if (base && base_node) { 2301 error_setg(errp, "'base' and 'base-node' cannot be specified " 2302 "at the same time"); 2303 return; 2304 } 2305 2306 if (base && bottom) { 2307 error_setg(errp, "'base' and 'bottom' cannot be specified " 2308 "at the same time"); 2309 return; 2310 } 2311 2312 if (bottom && base_node) { 2313 error_setg(errp, "'bottom' and 'base-node' cannot be specified " 2314 "at the same time"); 2315 return; 2316 } 2317 2318 if (!has_backing_mask_protocol) { 2319 backing_mask_protocol = false; 2320 } 2321 2322 if (!has_on_error) { 2323 on_error = BLOCKDEV_ON_ERROR_REPORT; 2324 } 2325 2326 bs = bdrv_lookup_bs(device, device, errp); 2327 if (!bs) { 2328 return; 2329 } 2330 2331 aio_context = bdrv_get_aio_context(bs); 2332 2333 bdrv_graph_rdlock_main_loop(); 2334 if (base) { 2335 base_bs = bdrv_find_backing_image(bs, base); 2336 if (base_bs == NULL) { 2337 error_setg(errp, "Can't find '%s' in the backing chain", base); 2338 goto out_rdlock; 2339 } 2340 assert(bdrv_get_aio_context(base_bs) == aio_context); 2341 } 2342 2343 if (base_node) { 2344 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2345 if (!base_bs) { 2346 goto out_rdlock; 2347 } 2348 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 2349 error_setg(errp, "Node '%s' is not a backing image of '%s'", 2350 base_node, device); 2351 goto out_rdlock; 2352 } 2353 assert(bdrv_get_aio_context(base_bs) == aio_context); 2354 2355 bdrv_refresh_filename(base_bs); 2356 } 2357 2358 if (bottom) { 2359 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); 2360 if (!bottom_bs) { 2361 goto out_rdlock; 2362 } 2363 if (!bottom_bs->drv) { 2364 error_setg(errp, "Node '%s' is not open", bottom); 2365 goto out_rdlock; 2366 } 2367 if (bottom_bs->drv->is_filter) { 2368 error_setg(errp, "Node '%s' is a filter, use a non-filter node " 2369 "as 'bottom'", bottom); 2370 goto out_rdlock; 2371 } 2372 if (!bdrv_chain_contains(bs, bottom_bs)) { 2373 error_setg(errp, "Node '%s' is not in a chain starting from '%s'", 2374 bottom, device); 2375 goto out_rdlock; 2376 } 2377 assert(bdrv_get_aio_context(bottom_bs) == aio_context); 2378 } 2379 2380 /* 2381 * Check for op blockers in the whole chain between bs and base (or bottom) 2382 */ 2383 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; 2384 for (iter = bs; iter && iter != iter_end; 2385 iter = bdrv_filter_or_cow_bs(iter)) 2386 { 2387 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 2388 goto out_rdlock; 2389 } 2390 } 2391 bdrv_graph_rdunlock_main_loop(); 2392 2393 /* if we are streaming the entire chain, the result will have no backing 2394 * file, and specifying one is therefore an error */ 2395 if (!base_bs && backing_file) { 2396 error_setg(errp, "backing file specified, but streaming the " 2397 "entire chain"); 2398 return; 2399 } 2400 2401 if (has_auto_finalize && !auto_finalize) { 2402 job_flags |= JOB_MANUAL_FINALIZE; 2403 } 2404 if (has_auto_dismiss && !auto_dismiss) { 2405 job_flags |= JOB_MANUAL_DISMISS; 2406 } 2407 2408 stream_start(job_id, bs, base_bs, backing_file, 2409 backing_mask_protocol, 2410 bottom_bs, job_flags, has_speed ? speed : 0, on_error, 2411 filter_node_name, &local_err); 2412 if (local_err) { 2413 error_propagate(errp, local_err); 2414 return; 2415 } 2416 2417 trace_qmp_block_stream(bs); 2418 return; 2419 2420 out_rdlock: 2421 bdrv_graph_rdunlock_main_loop(); 2422 } 2423 2424 void qmp_block_commit(const char *job_id, const char *device, 2425 const char *base_node, 2426 const char *base, 2427 const char *top_node, 2428 const char *top, 2429 const char *backing_file, 2430 bool has_backing_mask_protocol, 2431 bool backing_mask_protocol, 2432 bool has_speed, int64_t speed, 2433 bool has_on_error, BlockdevOnError on_error, 2434 const char *filter_node_name, 2435 bool has_auto_finalize, bool auto_finalize, 2436 bool has_auto_dismiss, bool auto_dismiss, 2437 Error **errp) 2438 { 2439 BlockDriverState *bs; 2440 BlockDriverState *iter; 2441 BlockDriverState *base_bs, *top_bs; 2442 AioContext *aio_context; 2443 Error *local_err = NULL; 2444 int job_flags = JOB_DEFAULT; 2445 uint64_t top_perm, top_shared; 2446 2447 /* TODO We'll eventually have to take a writer lock in this function */ 2448 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2449 2450 if (!has_speed) { 2451 speed = 0; 2452 } 2453 if (!has_on_error) { 2454 on_error = BLOCKDEV_ON_ERROR_REPORT; 2455 } 2456 if (has_auto_finalize && !auto_finalize) { 2457 job_flags |= JOB_MANUAL_FINALIZE; 2458 } 2459 if (has_auto_dismiss && !auto_dismiss) { 2460 job_flags |= JOB_MANUAL_DISMISS; 2461 } 2462 if (!has_backing_mask_protocol) { 2463 backing_mask_protocol = false; 2464 } 2465 2466 /* Important Note: 2467 * libvirt relies on the DeviceNotFound error class in order to probe for 2468 * live commit feature versions; for this to work, we must make sure to 2469 * perform the device lookup before any generic errors that may occur in a 2470 * scenario in which all optional arguments are omitted. */ 2471 bs = qmp_get_root_bs(device, &local_err); 2472 if (!bs) { 2473 bs = bdrv_lookup_bs(device, device, NULL); 2474 if (!bs) { 2475 error_free(local_err); 2476 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2477 "Device '%s' not found", device); 2478 } else { 2479 error_propagate(errp, local_err); 2480 } 2481 return; 2482 } 2483 2484 aio_context = bdrv_get_aio_context(bs); 2485 2486 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2487 return; 2488 } 2489 2490 /* default top_bs is the active layer */ 2491 top_bs = bs; 2492 2493 if (top_node && top) { 2494 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 2495 return; 2496 } else if (top_node) { 2497 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 2498 if (top_bs == NULL) { 2499 return; 2500 } 2501 if (!bdrv_chain_contains(bs, top_bs)) { 2502 error_setg(errp, "'%s' is not in this backing file chain", 2503 top_node); 2504 return; 2505 } 2506 } else if (top) { 2507 /* This strcmp() is just a shortcut, there is no need to 2508 * refresh @bs's filename. If it mismatches, 2509 * bdrv_find_backing_image() will do the refresh and may still 2510 * return @bs. */ 2511 if (strcmp(bs->filename, top) != 0) { 2512 top_bs = bdrv_find_backing_image(bs, top); 2513 } 2514 } 2515 2516 if (top_bs == NULL) { 2517 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2518 return; 2519 } 2520 2521 assert(bdrv_get_aio_context(top_bs) == aio_context); 2522 2523 if (base_node && base) { 2524 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 2525 return; 2526 } else if (base_node) { 2527 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2528 if (base_bs == NULL) { 2529 return; 2530 } 2531 if (!bdrv_chain_contains(top_bs, base_bs)) { 2532 error_setg(errp, "'%s' is not in this backing file chain", 2533 base_node); 2534 return; 2535 } 2536 } else if (base) { 2537 base_bs = bdrv_find_backing_image(top_bs, base); 2538 if (base_bs == NULL) { 2539 error_setg(errp, "Can't find '%s' in the backing chain", base); 2540 return; 2541 } 2542 } else { 2543 base_bs = bdrv_find_base(top_bs); 2544 if (base_bs == NULL) { 2545 error_setg(errp, "There is no backimg image"); 2546 return; 2547 } 2548 } 2549 2550 assert(bdrv_get_aio_context(base_bs) == aio_context); 2551 2552 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); 2553 iter = bdrv_filter_or_cow_bs(iter)) 2554 { 2555 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2556 return; 2557 } 2558 } 2559 2560 /* Do not allow attempts to commit an image into itself */ 2561 if (top_bs == base_bs) { 2562 error_setg(errp, "cannot commit an image into itself"); 2563 return; 2564 } 2565 2566 /* 2567 * Active commit is required if and only if someone has taken a 2568 * WRITE permission on the top node. Historically, we have always 2569 * used active commit for top nodes, so continue that practice 2570 * lest we possibly break clients that rely on this behavior, e.g. 2571 * to later attach this node to a writing parent. 2572 * (Active commit is never really wrong.) 2573 */ 2574 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); 2575 if (top_perm & BLK_PERM_WRITE || 2576 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) 2577 { 2578 if (backing_file) { 2579 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { 2580 error_setg(errp, "'backing-file' specified," 2581 " but 'top' is the active layer"); 2582 } else { 2583 error_setg(errp, "'backing-file' specified, but 'top' has a " 2584 "writer on it"); 2585 } 2586 return; 2587 } 2588 if (!job_id) { 2589 /* 2590 * Emulate here what block_job_create() does, because it 2591 * is possible that @bs != @top_bs (the block job should 2592 * be named after @bs, even if @top_bs is the actual 2593 * source) 2594 */ 2595 job_id = bdrv_get_device_name(bs); 2596 } 2597 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, 2598 filter_node_name, NULL, NULL, false, &local_err); 2599 } else { 2600 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 2601 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2602 return; 2603 } 2604 commit_start(job_id, bs, base_bs, top_bs, job_flags, 2605 speed, on_error, backing_file, 2606 backing_mask_protocol, 2607 filter_node_name, &local_err); 2608 } 2609 if (local_err != NULL) { 2610 error_propagate(errp, local_err); 2611 return; 2612 } 2613 } 2614 2615 /* Common QMP interface for drive-backup and blockdev-backup */ 2616 static BlockJob *do_backup_common(BackupCommon *backup, 2617 BlockDriverState *bs, 2618 BlockDriverState *target_bs, 2619 AioContext *aio_context, 2620 JobTxn *txn, Error **errp) 2621 { 2622 BlockJob *job = NULL; 2623 BdrvDirtyBitmap *bmap = NULL; 2624 BackupPerf perf = { .max_workers = 64 }; 2625 int job_flags = JOB_DEFAULT; 2626 2627 if (!backup->has_speed) { 2628 backup->speed = 0; 2629 } 2630 if (!backup->has_on_source_error) { 2631 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2632 } 2633 if (!backup->has_on_target_error) { 2634 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2635 } 2636 if (!backup->has_auto_finalize) { 2637 backup->auto_finalize = true; 2638 } 2639 if (!backup->has_auto_dismiss) { 2640 backup->auto_dismiss = true; 2641 } 2642 if (!backup->has_compress) { 2643 backup->compress = false; 2644 } 2645 2646 if (backup->x_perf) { 2647 if (backup->x_perf->has_use_copy_range) { 2648 perf.use_copy_range = backup->x_perf->use_copy_range; 2649 } 2650 if (backup->x_perf->has_max_workers) { 2651 perf.max_workers = backup->x_perf->max_workers; 2652 } 2653 if (backup->x_perf->has_max_chunk) { 2654 perf.max_chunk = backup->x_perf->max_chunk; 2655 } 2656 } 2657 2658 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || 2659 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { 2660 /* done before desugaring 'incremental' to print the right message */ 2661 if (!backup->bitmap) { 2662 error_setg(errp, "must provide a valid bitmap name for " 2663 "'%s' sync mode", MirrorSyncMode_str(backup->sync)); 2664 return NULL; 2665 } 2666 } 2667 2668 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { 2669 if (backup->has_bitmap_mode && 2670 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { 2671 error_setg(errp, "Bitmap sync mode must be '%s' " 2672 "when using sync mode '%s'", 2673 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), 2674 MirrorSyncMode_str(backup->sync)); 2675 return NULL; 2676 } 2677 backup->has_bitmap_mode = true; 2678 backup->sync = MIRROR_SYNC_MODE_BITMAP; 2679 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; 2680 } 2681 2682 if (backup->bitmap) { 2683 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 2684 if (!bmap) { 2685 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 2686 return NULL; 2687 } 2688 if (!backup->has_bitmap_mode) { 2689 error_setg(errp, "Bitmap sync mode must be given " 2690 "when providing a bitmap"); 2691 return NULL; 2692 } 2693 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2694 return NULL; 2695 } 2696 2697 /* This does not produce a useful bitmap artifact: */ 2698 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 2699 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" 2700 " outputs", MirrorSyncMode_str(backup->sync)); 2701 return NULL; 2702 } 2703 2704 /* If the bitmap isn't used for input or output, this is useless: */ 2705 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && 2706 backup->sync != MIRROR_SYNC_MODE_BITMAP) { 2707 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" 2708 " when combined with sync mode '%s'", 2709 BitmapSyncMode_str(backup->bitmap_mode), 2710 MirrorSyncMode_str(backup->sync)); 2711 return NULL; 2712 } 2713 } 2714 2715 if (!backup->bitmap && backup->has_bitmap_mode) { 2716 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); 2717 return NULL; 2718 } 2719 2720 if (!backup->auto_finalize) { 2721 job_flags |= JOB_MANUAL_FINALIZE; 2722 } 2723 if (!backup->auto_dismiss) { 2724 job_flags |= JOB_MANUAL_DISMISS; 2725 } 2726 2727 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 2728 backup->sync, bmap, backup->bitmap_mode, 2729 backup->compress, 2730 backup->filter_node_name, 2731 &perf, 2732 backup->on_source_error, 2733 backup->on_target_error, 2734 job_flags, NULL, NULL, txn, errp); 2735 return job; 2736 } 2737 2738 void qmp_drive_backup(DriveBackup *backup, Error **errp) 2739 { 2740 TransactionAction action = { 2741 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, 2742 .u.drive_backup.data = backup, 2743 }; 2744 blockdev_do_action(&action, errp); 2745 } 2746 2747 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, 2748 bool flat, 2749 Error **errp) 2750 { 2751 bool return_flat = has_flat && flat; 2752 2753 return bdrv_named_nodes_list(return_flat, errp); 2754 } 2755 2756 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 2757 { 2758 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2759 2760 return bdrv_get_xdbg_block_graph(errp); 2761 } 2762 2763 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) 2764 { 2765 TransactionAction action = { 2766 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, 2767 .u.blockdev_backup.data = backup, 2768 }; 2769 blockdev_do_action(&action, errp); 2770 } 2771 2772 /* Parameter check and block job starting for drive mirroring. 2773 * Caller should hold @device and @target's aio context (must be the same). 2774 **/ 2775 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 2776 BlockDriverState *target, 2777 const char *replaces, 2778 enum MirrorSyncMode sync, 2779 BlockMirrorBackingMode backing_mode, 2780 bool zero_target, 2781 bool has_speed, int64_t speed, 2782 bool has_granularity, uint32_t granularity, 2783 bool has_buf_size, int64_t buf_size, 2784 bool has_on_source_error, 2785 BlockdevOnError on_source_error, 2786 bool has_on_target_error, 2787 BlockdevOnError on_target_error, 2788 bool has_unmap, bool unmap, 2789 const char *filter_node_name, 2790 bool has_copy_mode, MirrorCopyMode copy_mode, 2791 bool has_auto_finalize, bool auto_finalize, 2792 bool has_auto_dismiss, bool auto_dismiss, 2793 Error **errp) 2794 { 2795 BlockDriverState *unfiltered_bs; 2796 int job_flags = JOB_DEFAULT; 2797 2798 GLOBAL_STATE_CODE(); 2799 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2800 2801 if (!has_speed) { 2802 speed = 0; 2803 } 2804 if (!has_on_source_error) { 2805 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2806 } 2807 if (!has_on_target_error) { 2808 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2809 } 2810 if (!has_granularity) { 2811 granularity = 0; 2812 } 2813 if (!has_buf_size) { 2814 buf_size = 0; 2815 } 2816 if (!has_unmap) { 2817 unmap = true; 2818 } 2819 if (!has_copy_mode) { 2820 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 2821 } 2822 if (has_auto_finalize && !auto_finalize) { 2823 job_flags |= JOB_MANUAL_FINALIZE; 2824 } 2825 if (has_auto_dismiss && !auto_dismiss) { 2826 job_flags |= JOB_MANUAL_DISMISS; 2827 } 2828 2829 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2830 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2831 "a value in range [512B, 64MB]"); 2832 return; 2833 } 2834 if (granularity & (granularity - 1)) { 2835 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2836 "a power of 2"); 2837 return; 2838 } 2839 2840 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2841 return; 2842 } 2843 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 2844 return; 2845 } 2846 2847 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { 2848 sync = MIRROR_SYNC_MODE_FULL; 2849 } 2850 2851 if (!replaces) { 2852 /* We want to mirror from @bs, but keep implicit filters on top */ 2853 unfiltered_bs = bdrv_skip_implicit_filters(bs); 2854 if (unfiltered_bs != bs) { 2855 replaces = unfiltered_bs->node_name; 2856 } 2857 } 2858 2859 if (replaces) { 2860 BlockDriverState *to_replace_bs; 2861 int64_t bs_size, replace_size; 2862 2863 bs_size = bdrv_getlength(bs); 2864 if (bs_size < 0) { 2865 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 2866 return; 2867 } 2868 2869 to_replace_bs = check_to_replace_node(bs, replaces, errp); 2870 if (!to_replace_bs) { 2871 return; 2872 } 2873 2874 replace_size = bdrv_getlength(to_replace_bs); 2875 2876 if (replace_size < 0) { 2877 error_setg_errno(errp, -replace_size, 2878 "Failed to query the replacement node's size"); 2879 return; 2880 } 2881 if (bs_size != replace_size) { 2882 error_setg(errp, "cannot replace image with a mirror image of " 2883 "different size"); 2884 return; 2885 } 2886 } 2887 2888 /* pass the node name to replace to mirror start since it's loose coupling 2889 * and will allow to check whether the node still exist at mirror completion 2890 */ 2891 mirror_start(job_id, bs, target, 2892 replaces, job_flags, 2893 speed, granularity, buf_size, sync, backing_mode, zero_target, 2894 on_source_error, on_target_error, unmap, filter_node_name, 2895 copy_mode, errp); 2896 } 2897 2898 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 2899 { 2900 BlockDriverState *bs; 2901 BlockDriverState *target_backing_bs, *target_bs; 2902 AioContext *aio_context; 2903 BlockMirrorBackingMode backing_mode; 2904 Error *local_err = NULL; 2905 QDict *options = NULL; 2906 int flags; 2907 int64_t size; 2908 const char *format = arg->format; 2909 bool zero_target; 2910 int ret; 2911 2912 bs = qmp_get_root_bs(arg->device, errp); 2913 if (!bs) { 2914 return; 2915 } 2916 2917 /* Early check to avoid creating target */ 2918 bdrv_graph_rdlock_main_loop(); 2919 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2920 bdrv_graph_rdunlock_main_loop(); 2921 return; 2922 } 2923 2924 aio_context = bdrv_get_aio_context(bs); 2925 2926 if (!arg->has_mode) { 2927 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2928 } 2929 2930 if (!arg->format) { 2931 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 2932 ? NULL : bs->drv->format_name); 2933 } 2934 2935 flags = bs->open_flags | BDRV_O_RDWR; 2936 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); 2937 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { 2938 arg->sync = MIRROR_SYNC_MODE_FULL; 2939 } 2940 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 2941 target_backing_bs = bs; 2942 } 2943 bdrv_graph_rdunlock_main_loop(); 2944 2945 size = bdrv_getlength(bs); 2946 if (size < 0) { 2947 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2948 return; 2949 } 2950 2951 if (arg->replaces) { 2952 if (!arg->node_name) { 2953 error_setg(errp, "a node-name must be provided when replacing a" 2954 " named node of the graph"); 2955 return; 2956 } 2957 } 2958 2959 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 2960 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 2961 } else { 2962 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 2963 } 2964 2965 /* Don't open backing image in create() */ 2966 flags |= BDRV_O_NO_BACKING; 2967 2968 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) 2969 && arg->mode != NEW_IMAGE_MODE_EXISTING) 2970 { 2971 /* create new image w/o backing file */ 2972 assert(format); 2973 bdrv_img_create(arg->target, format, 2974 NULL, NULL, NULL, size, flags, false, &local_err); 2975 } else { 2976 BlockDriverState *explicit_backing; 2977 2978 switch (arg->mode) { 2979 case NEW_IMAGE_MODE_EXISTING: 2980 break; 2981 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2982 /* 2983 * Create new image with backing file. 2984 * Implicit filters should not appear in the filename. 2985 */ 2986 bdrv_graph_rdlock_main_loop(); 2987 explicit_backing = bdrv_skip_implicit_filters(target_backing_bs); 2988 bdrv_refresh_filename(explicit_backing); 2989 bdrv_graph_rdunlock_main_loop(); 2990 2991 bdrv_img_create(arg->target, format, 2992 explicit_backing->filename, 2993 explicit_backing->drv->format_name, 2994 NULL, size, flags, false, &local_err); 2995 break; 2996 default: 2997 abort(); 2998 } 2999 } 3000 3001 if (local_err) { 3002 error_propagate(errp, local_err); 3003 return; 3004 } 3005 3006 options = qdict_new(); 3007 if (arg->node_name) { 3008 qdict_put_str(options, "node-name", arg->node_name); 3009 } 3010 if (format) { 3011 qdict_put_str(options, "driver", format); 3012 } 3013 3014 /* Mirroring takes care of copy-on-write using the source's backing 3015 * file. 3016 */ 3017 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3018 if (!target_bs) { 3019 return; 3020 } 3021 3022 bdrv_graph_rdlock_main_loop(); 3023 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && 3024 (arg->mode == NEW_IMAGE_MODE_EXISTING || 3025 !bdrv_has_zero_init(target_bs))); 3026 bdrv_graph_rdunlock_main_loop(); 3027 3028 3029 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3030 if (ret < 0) { 3031 bdrv_unref(target_bs); 3032 return; 3033 } 3034 3035 blockdev_mirror_common(arg->job_id, bs, target_bs, 3036 arg->replaces, arg->sync, 3037 backing_mode, zero_target, 3038 arg->has_speed, arg->speed, 3039 arg->has_granularity, arg->granularity, 3040 arg->has_buf_size, arg->buf_size, 3041 arg->has_on_source_error, arg->on_source_error, 3042 arg->has_on_target_error, arg->on_target_error, 3043 arg->has_unmap, arg->unmap, 3044 NULL, 3045 arg->has_copy_mode, arg->copy_mode, 3046 arg->has_auto_finalize, arg->auto_finalize, 3047 arg->has_auto_dismiss, arg->auto_dismiss, 3048 errp); 3049 bdrv_unref(target_bs); 3050 } 3051 3052 void qmp_blockdev_mirror(const char *job_id, 3053 const char *device, const char *target, 3054 const char *replaces, 3055 MirrorSyncMode sync, 3056 bool has_speed, int64_t speed, 3057 bool has_granularity, uint32_t granularity, 3058 bool has_buf_size, int64_t buf_size, 3059 bool has_on_source_error, 3060 BlockdevOnError on_source_error, 3061 bool has_on_target_error, 3062 BlockdevOnError on_target_error, 3063 const char *filter_node_name, 3064 bool has_copy_mode, MirrorCopyMode copy_mode, 3065 bool has_auto_finalize, bool auto_finalize, 3066 bool has_auto_dismiss, bool auto_dismiss, 3067 Error **errp) 3068 { 3069 BlockDriverState *bs; 3070 BlockDriverState *target_bs; 3071 AioContext *aio_context; 3072 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3073 bool zero_target; 3074 int ret; 3075 3076 bs = qmp_get_root_bs(device, errp); 3077 if (!bs) { 3078 return; 3079 } 3080 3081 target_bs = bdrv_lookup_bs(target, target, errp); 3082 if (!target_bs) { 3083 return; 3084 } 3085 3086 zero_target = (sync == MIRROR_SYNC_MODE_FULL); 3087 3088 aio_context = bdrv_get_aio_context(bs); 3089 3090 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3091 if (ret < 0) { 3092 return; 3093 } 3094 3095 blockdev_mirror_common(job_id, bs, target_bs, 3096 replaces, sync, backing_mode, 3097 zero_target, has_speed, speed, 3098 has_granularity, granularity, 3099 has_buf_size, buf_size, 3100 has_on_source_error, on_source_error, 3101 has_on_target_error, on_target_error, 3102 true, true, filter_node_name, 3103 has_copy_mode, copy_mode, 3104 has_auto_finalize, auto_finalize, 3105 has_auto_dismiss, auto_dismiss, 3106 errp); 3107 } 3108 3109 /* 3110 * Get a block job using its ID. Called with job_mutex held. 3111 */ 3112 static BlockJob *find_block_job_locked(const char *id, Error **errp) 3113 { 3114 BlockJob *job; 3115 3116 assert(id != NULL); 3117 3118 job = block_job_get_locked(id); 3119 3120 if (!job) { 3121 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3122 "Block job '%s' not found", id); 3123 return NULL; 3124 } 3125 3126 return job; 3127 } 3128 3129 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3130 { 3131 BlockJob *job; 3132 3133 JOB_LOCK_GUARD(); 3134 job = find_block_job_locked(device, errp); 3135 3136 if (!job) { 3137 return; 3138 } 3139 3140 block_job_set_speed_locked(job, speed, errp); 3141 } 3142 3143 void qmp_block_job_cancel(const char *device, 3144 bool has_force, bool force, Error **errp) 3145 { 3146 BlockJob *job; 3147 3148 JOB_LOCK_GUARD(); 3149 job = find_block_job_locked(device, errp); 3150 3151 if (!job) { 3152 return; 3153 } 3154 3155 if (!has_force) { 3156 force = false; 3157 } 3158 3159 if (job_user_paused_locked(&job->job) && !force) { 3160 error_setg(errp, "The block job for device '%s' is currently paused", 3161 device); 3162 return; 3163 } 3164 3165 trace_qmp_block_job_cancel(job); 3166 job_user_cancel_locked(&job->job, force, errp); 3167 } 3168 3169 void qmp_block_job_pause(const char *device, Error **errp) 3170 { 3171 BlockJob *job; 3172 3173 JOB_LOCK_GUARD(); 3174 job = find_block_job_locked(device, errp); 3175 3176 if (!job) { 3177 return; 3178 } 3179 3180 trace_qmp_block_job_pause(job); 3181 job_user_pause_locked(&job->job, errp); 3182 } 3183 3184 void qmp_block_job_resume(const char *device, Error **errp) 3185 { 3186 BlockJob *job; 3187 3188 JOB_LOCK_GUARD(); 3189 job = find_block_job_locked(device, errp); 3190 3191 if (!job) { 3192 return; 3193 } 3194 3195 trace_qmp_block_job_resume(job); 3196 job_user_resume_locked(&job->job, errp); 3197 } 3198 3199 void qmp_block_job_complete(const char *device, Error **errp) 3200 { 3201 BlockJob *job; 3202 3203 JOB_LOCK_GUARD(); 3204 job = find_block_job_locked(device, errp); 3205 3206 if (!job) { 3207 return; 3208 } 3209 3210 trace_qmp_block_job_complete(job); 3211 job_complete_locked(&job->job, errp); 3212 } 3213 3214 void qmp_block_job_finalize(const char *id, Error **errp) 3215 { 3216 BlockJob *job; 3217 3218 JOB_LOCK_GUARD(); 3219 job = find_block_job_locked(id, errp); 3220 3221 if (!job) { 3222 return; 3223 } 3224 3225 trace_qmp_block_job_finalize(job); 3226 job_ref_locked(&job->job); 3227 job_finalize_locked(&job->job, errp); 3228 3229 job_unref_locked(&job->job); 3230 } 3231 3232 void qmp_block_job_dismiss(const char *id, Error **errp) 3233 { 3234 BlockJob *bjob; 3235 Job *job; 3236 3237 JOB_LOCK_GUARD(); 3238 bjob = find_block_job_locked(id, errp); 3239 3240 if (!bjob) { 3241 return; 3242 } 3243 3244 trace_qmp_block_job_dismiss(bjob); 3245 job = &bjob->job; 3246 job_dismiss_locked(&job, errp); 3247 } 3248 3249 void qmp_block_job_change(BlockJobChangeOptions *opts, Error **errp) 3250 { 3251 BlockJob *job; 3252 3253 JOB_LOCK_GUARD(); 3254 job = find_block_job_locked(opts->id, errp); 3255 3256 if (!job) { 3257 return; 3258 } 3259 3260 block_job_change_locked(job, opts, errp); 3261 } 3262 3263 void qmp_change_backing_file(const char *device, 3264 const char *image_node_name, 3265 const char *backing_file, 3266 Error **errp) 3267 { 3268 BlockDriverState *bs = NULL; 3269 BlockDriverState *image_bs = NULL; 3270 Error *local_err = NULL; 3271 bool ro; 3272 int ret; 3273 3274 bs = qmp_get_root_bs(device, errp); 3275 if (!bs) { 3276 return; 3277 } 3278 3279 bdrv_graph_rdlock_main_loop(); 3280 3281 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3282 if (local_err) { 3283 error_propagate(errp, local_err); 3284 goto out_rdlock; 3285 } 3286 3287 if (!image_bs) { 3288 error_setg(errp, "image file not found"); 3289 goto out_rdlock; 3290 } 3291 3292 if (bdrv_find_base(image_bs) == image_bs) { 3293 error_setg(errp, "not allowing backing file change on an image " 3294 "without a backing file"); 3295 goto out_rdlock; 3296 } 3297 3298 /* even though we are not necessarily operating on bs, we need it to 3299 * determine if block ops are currently prohibited on the chain */ 3300 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3301 goto out_rdlock; 3302 } 3303 3304 /* final sanity check */ 3305 if (!bdrv_chain_contains(bs, image_bs)) { 3306 error_setg(errp, "'%s' and image file are not in the same chain", 3307 device); 3308 goto out_rdlock; 3309 } 3310 bdrv_graph_rdunlock_main_loop(); 3311 3312 /* if not r/w, reopen to make r/w */ 3313 ro = bdrv_is_read_only(image_bs); 3314 3315 if (ro) { 3316 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 3317 return; 3318 } 3319 } 3320 3321 ret = bdrv_change_backing_file(image_bs, backing_file, 3322 image_bs->drv ? image_bs->drv->format_name : "", 3323 false); 3324 3325 if (ret < 0) { 3326 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3327 backing_file); 3328 /* don't exit here, so we can try to restore open flags if 3329 * appropriate */ 3330 } 3331 3332 if (ro) { 3333 bdrv_reopen_set_read_only(image_bs, true, errp); 3334 } 3335 return; 3336 3337 out_rdlock: 3338 bdrv_graph_rdunlock_main_loop(); 3339 } 3340 3341 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3342 { 3343 BlockDriverState *bs; 3344 QObject *obj; 3345 Visitor *v = qobject_output_visitor_new(&obj); 3346 QDict *qdict; 3347 3348 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3349 visit_complete(v, &obj); 3350 qdict = qobject_to(QDict, obj); 3351 3352 qdict_flatten(qdict); 3353 3354 if (!qdict_get_try_str(qdict, "node-name")) { 3355 error_setg(errp, "'node-name' must be specified for the root node"); 3356 goto fail; 3357 } 3358 3359 bs = bds_tree_init(qdict, errp); 3360 if (!bs) { 3361 goto fail; 3362 } 3363 3364 bdrv_set_monitor_owned(bs); 3365 3366 fail: 3367 visit_free(v); 3368 } 3369 3370 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp) 3371 { 3372 BlockReopenQueue *queue = NULL; 3373 3374 /* Add each one of the BDS that we want to reopen to the queue */ 3375 for (; reopen_list != NULL; reopen_list = reopen_list->next) { 3376 BlockdevOptions *options = reopen_list->value; 3377 BlockDriverState *bs; 3378 QObject *obj; 3379 Visitor *v; 3380 QDict *qdict; 3381 3382 /* Check for the selected node name */ 3383 if (!options->node_name) { 3384 error_setg(errp, "node-name not specified"); 3385 goto fail; 3386 } 3387 3388 bs = bdrv_find_node(options->node_name); 3389 if (!bs) { 3390 error_setg(errp, "Failed to find node with node-name='%s'", 3391 options->node_name); 3392 goto fail; 3393 } 3394 3395 /* Put all options in a QDict and flatten it */ 3396 v = qobject_output_visitor_new(&obj); 3397 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3398 visit_complete(v, &obj); 3399 visit_free(v); 3400 3401 qdict = qobject_to(QDict, obj); 3402 3403 qdict_flatten(qdict); 3404 3405 queue = bdrv_reopen_queue(queue, bs, qdict, false); 3406 } 3407 3408 /* Perform the reopen operation */ 3409 bdrv_reopen_multiple(queue, errp); 3410 queue = NULL; 3411 3412 fail: 3413 bdrv_reopen_queue_free(queue); 3414 } 3415 3416 void qmp_blockdev_del(const char *node_name, Error **errp) 3417 { 3418 BlockDriverState *bs; 3419 3420 GLOBAL_STATE_CODE(); 3421 GRAPH_RDLOCK_GUARD_MAINLOOP(); 3422 3423 bs = bdrv_find_node(node_name); 3424 if (!bs) { 3425 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3426 return; 3427 } 3428 if (bdrv_has_blk(bs)) { 3429 error_setg(errp, "Node %s is in use", node_name); 3430 return; 3431 } 3432 3433 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 3434 return; 3435 } 3436 3437 if (!QTAILQ_IN_USE(bs, monitor_list)) { 3438 error_setg(errp, "Node %s is not owned by the monitor", 3439 bs->node_name); 3440 return; 3441 } 3442 3443 if (bs->refcnt > 1) { 3444 error_setg(errp, "Block device %s is in use", 3445 bdrv_get_device_or_node_name(bs)); 3446 return; 3447 } 3448 3449 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 3450 bdrv_unref(bs); 3451 } 3452 3453 static BdrvChild * GRAPH_RDLOCK 3454 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name) 3455 { 3456 BdrvChild *child; 3457 3458 QLIST_FOREACH(child, &parent_bs->children, next) { 3459 if (strcmp(child->name, child_name) == 0) { 3460 return child; 3461 } 3462 } 3463 3464 return NULL; 3465 } 3466 3467 void qmp_x_blockdev_change(const char *parent, const char *child, 3468 const char *node, Error **errp) 3469 { 3470 BlockDriverState *parent_bs, *new_bs = NULL; 3471 BdrvChild *p_child; 3472 3473 bdrv_graph_wrlock(); 3474 3475 parent_bs = bdrv_lookup_bs(parent, parent, errp); 3476 if (!parent_bs) { 3477 goto out; 3478 } 3479 3480 if (!child == !node) { 3481 if (child) { 3482 error_setg(errp, "The parameters child and node are in conflict"); 3483 } else { 3484 error_setg(errp, "Either child or node must be specified"); 3485 } 3486 goto out; 3487 } 3488 3489 if (child) { 3490 p_child = bdrv_find_child(parent_bs, child); 3491 if (!p_child) { 3492 error_setg(errp, "Node '%s' does not have child '%s'", 3493 parent, child); 3494 goto out; 3495 } 3496 bdrv_del_child(parent_bs, p_child, errp); 3497 } 3498 3499 if (node) { 3500 new_bs = bdrv_find_node(node); 3501 if (!new_bs) { 3502 error_setg(errp, "Node '%s' not found", node); 3503 goto out; 3504 } 3505 bdrv_add_child(parent_bs, new_bs, errp); 3506 } 3507 3508 out: 3509 bdrv_graph_wrunlock(); 3510 } 3511 3512 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3513 { 3514 BlockJobInfoList *head = NULL, **tail = &head; 3515 BlockJob *job; 3516 3517 JOB_LOCK_GUARD(); 3518 3519 for (job = block_job_next_locked(NULL); job; 3520 job = block_job_next_locked(job)) { 3521 BlockJobInfo *value; 3522 3523 if (block_job_is_internal(job)) { 3524 continue; 3525 } 3526 value = block_job_query_locked(job, errp); 3527 if (!value) { 3528 qapi_free_BlockJobInfoList(head); 3529 return NULL; 3530 } 3531 QAPI_LIST_APPEND(tail, value); 3532 } 3533 3534 return head; 3535 } 3536 3537 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 3538 bool has_force, bool force, Error **errp) 3539 { 3540 AioContext *new_context; 3541 BlockDriverState *bs; 3542 3543 GRAPH_RDLOCK_GUARD_MAINLOOP(); 3544 3545 bs = bdrv_find_node(node_name); 3546 if (!bs) { 3547 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3548 return; 3549 } 3550 3551 /* Protects against accidents. */ 3552 if (!(has_force && force) && bdrv_has_blk(bs)) { 3553 error_setg(errp, "Node %s is associated with a BlockBackend and could " 3554 "be in use (use force=true to override this check)", 3555 node_name); 3556 return; 3557 } 3558 3559 if (iothread->type == QTYPE_QSTRING) { 3560 IOThread *obj = iothread_by_id(iothread->u.s); 3561 if (!obj) { 3562 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 3563 return; 3564 } 3565 3566 new_context = iothread_get_aio_context(obj); 3567 } else { 3568 new_context = qemu_get_aio_context(); 3569 } 3570 3571 bdrv_try_change_aio_context(bs, new_context, NULL, errp); 3572 } 3573 3574 QemuOptsList qemu_common_drive_opts = { 3575 .name = "drive", 3576 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3577 .desc = { 3578 { 3579 .name = "snapshot", 3580 .type = QEMU_OPT_BOOL, 3581 .help = "enable/disable snapshot mode", 3582 },{ 3583 .name = "aio", 3584 .type = QEMU_OPT_STRING, 3585 .help = "host AIO implementation (threads, native, io_uring)", 3586 },{ 3587 .name = BDRV_OPT_CACHE_WB, 3588 .type = QEMU_OPT_BOOL, 3589 .help = "Enable writeback mode", 3590 },{ 3591 .name = "format", 3592 .type = QEMU_OPT_STRING, 3593 .help = "disk format (raw, qcow2, ...)", 3594 },{ 3595 .name = "rerror", 3596 .type = QEMU_OPT_STRING, 3597 .help = "read error action", 3598 },{ 3599 .name = "werror", 3600 .type = QEMU_OPT_STRING, 3601 .help = "write error action", 3602 },{ 3603 .name = BDRV_OPT_READ_ONLY, 3604 .type = QEMU_OPT_BOOL, 3605 .help = "open drive file as read-only", 3606 }, 3607 3608 THROTTLE_OPTS, 3609 3610 { 3611 .name = "throttling.group", 3612 .type = QEMU_OPT_STRING, 3613 .help = "name of the block throttling group", 3614 },{ 3615 .name = "copy-on-read", 3616 .type = QEMU_OPT_BOOL, 3617 .help = "copy read data from backing file into image file", 3618 },{ 3619 .name = "detect-zeroes", 3620 .type = QEMU_OPT_STRING, 3621 .help = "try to optimize zero writes (off, on, unmap)", 3622 },{ 3623 .name = "stats-account-invalid", 3624 .type = QEMU_OPT_BOOL, 3625 .help = "whether to account for invalid I/O operations " 3626 "in the statistics", 3627 },{ 3628 .name = "stats-account-failed", 3629 .type = QEMU_OPT_BOOL, 3630 .help = "whether to account for failed I/O operations " 3631 "in the statistics", 3632 }, 3633 { /* end of list */ } 3634 }, 3635 }; 3636 3637 QemuOptsList qemu_drive_opts = { 3638 .name = "drive", 3639 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3640 .desc = { 3641 /* 3642 * no elements => accept any params 3643 * validation will happen later 3644 */ 3645 { /* end of list */ } 3646 }, 3647 }; 3648