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, device); 1399 return; 1400 } 1401 1402 if (bdrv_op_is_blocked(state->old_bs, 1403 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1404 return; 1405 } 1406 1407 if (!bdrv_is_read_only(state->old_bs)) { 1408 if (bdrv_flush(state->old_bs)) { 1409 error_setg(errp, QERR_IO_ERROR); 1410 return; 1411 } 1412 } 1413 1414 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1415 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1416 const char *format = s->format ?: "qcow2"; 1417 enum NewImageMode mode; 1418 const char *snapshot_node_name = s->snapshot_node_name; 1419 1420 if (node_name && !snapshot_node_name) { 1421 error_setg(errp, "New overlay node-name missing"); 1422 return; 1423 } 1424 1425 if (snapshot_node_name && 1426 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1427 error_setg(errp, "New overlay node-name already in use"); 1428 return; 1429 } 1430 1431 flags = state->old_bs->open_flags; 1432 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1433 flags |= BDRV_O_NO_BACKING; 1434 1435 /* create new image w/backing file */ 1436 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1437 if (mode != NEW_IMAGE_MODE_EXISTING) { 1438 int64_t size = bdrv_getlength(state->old_bs); 1439 if (size < 0) { 1440 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1441 return; 1442 } 1443 bdrv_refresh_filename(state->old_bs); 1444 1445 bdrv_img_create(new_image_file, format, 1446 state->old_bs->filename, 1447 state->old_bs->drv->format_name, 1448 NULL, size, flags, false, &local_err); 1449 1450 if (local_err) { 1451 error_propagate(errp, local_err); 1452 return; 1453 } 1454 } 1455 1456 options = qdict_new(); 1457 if (snapshot_node_name) { 1458 qdict_put_str(options, "node-name", snapshot_node_name); 1459 } 1460 qdict_put_str(options, "driver", format); 1461 } 1462 1463 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1464 errp); 1465 1466 /* We will manually add the backing_hd field to the bs later */ 1467 if (!state->new_bs) { 1468 return; 1469 } 1470 1471 /* 1472 * Allow attaching a backing file to an overlay that's already in use only 1473 * if the parents don't assume that they are already seeing a valid image. 1474 * (Specifically, allow it as a mirror target, which is write-only access.) 1475 */ 1476 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); 1477 if (perm & BLK_PERM_CONSISTENT_READ) { 1478 error_setg(errp, "The overlay is already in use"); 1479 return; 1480 } 1481 1482 if (state->new_bs->drv->is_filter) { 1483 error_setg(errp, "Filters cannot be used as overlays"); 1484 return; 1485 } 1486 1487 if (bdrv_cow_child(state->new_bs)) { 1488 error_setg(errp, "The overlay already has a backing image"); 1489 return; 1490 } 1491 1492 if (!state->new_bs->drv->supports_backing) { 1493 error_setg(errp, "The overlay does not support backing images"); 1494 return; 1495 } 1496 1497 ret = bdrv_append(state->new_bs, state->old_bs, errp); 1498 if (ret < 0) { 1499 return; 1500 } 1501 state->overlay_appended = true; 1502 } 1503 1504 static void external_snapshot_commit(void *opaque) 1505 { 1506 ExternalSnapshotState *state = opaque; 1507 1508 /* We don't need (or want) to use the transactional 1509 * bdrv_reopen_multiple() across all the entries at once, because we 1510 * don't want to abort all of them if one of them fails the reopen */ 1511 if (!qatomic_read(&state->old_bs->copy_on_read)) { 1512 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1513 } 1514 } 1515 1516 static void external_snapshot_abort(void *opaque) 1517 { 1518 ExternalSnapshotState *state = opaque; 1519 if (state->new_bs) { 1520 if (state->overlay_appended) { 1521 AioContext *aio_context; 1522 AioContext *tmp_context; 1523 int ret; 1524 1525 aio_context = bdrv_get_aio_context(state->old_bs); 1526 1527 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1528 close state->old_bs; we need it */ 1529 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1530 1531 /* 1532 * The call to bdrv_set_backing_hd() above returns state->old_bs to 1533 * the main AioContext. As we're still going to be using it, return 1534 * it to the AioContext it was before. 1535 */ 1536 tmp_context = bdrv_get_aio_context(state->old_bs); 1537 if (aio_context != tmp_context) { 1538 ret = bdrv_try_change_aio_context(state->old_bs, 1539 aio_context, NULL, NULL); 1540 assert(ret == 0); 1541 } 1542 1543 bdrv_drained_begin(state->new_bs); 1544 bdrv_graph_wrlock(); 1545 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1546 bdrv_graph_wrunlock(); 1547 bdrv_drained_end(state->new_bs); 1548 1549 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1550 } 1551 } 1552 } 1553 1554 static void external_snapshot_clean(void *opaque) 1555 { 1556 g_autofree ExternalSnapshotState *state = opaque; 1557 1558 if (!state->old_bs) { 1559 return; 1560 } 1561 1562 bdrv_drained_end(state->old_bs); 1563 bdrv_unref(state->new_bs); 1564 } 1565 1566 typedef struct DriveBackupState { 1567 BlockDriverState *bs; 1568 BlockJob *job; 1569 } DriveBackupState; 1570 1571 static BlockJob *do_backup_common(BackupCommon *backup, 1572 BlockDriverState *bs, 1573 BlockDriverState *target_bs, 1574 AioContext *aio_context, 1575 JobTxn *txn, Error **errp); 1576 1577 static void drive_backup_commit(void *opaque); 1578 static void drive_backup_abort(void *opaque); 1579 static void drive_backup_clean(void *opaque); 1580 TransactionActionDrv drive_backup_drv = { 1581 .commit = drive_backup_commit, 1582 .abort = drive_backup_abort, 1583 .clean = drive_backup_clean, 1584 }; 1585 1586 static void drive_backup_action(DriveBackup *backup, 1587 JobTxn *block_job_txn, 1588 Transaction *tran, Error **errp) 1589 { 1590 DriveBackupState *state = g_new0(DriveBackupState, 1); 1591 BlockDriverState *bs; 1592 BlockDriverState *target_bs; 1593 BlockDriverState *source = NULL; 1594 AioContext *aio_context; 1595 const char *format; 1596 QDict *options; 1597 Error *local_err = NULL; 1598 int flags; 1599 int64_t size; 1600 bool set_backing_hd = false; 1601 int ret; 1602 1603 GLOBAL_STATE_CODE(); 1604 1605 tran_add(tran, &drive_backup_drv, state); 1606 1607 if (!backup->has_mode) { 1608 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1609 } 1610 1611 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1612 if (!bs) { 1613 return; 1614 } 1615 1616 if (!bs->drv) { 1617 error_setg(errp, "Device has no medium"); 1618 return; 1619 } 1620 1621 aio_context = bdrv_get_aio_context(bs); 1622 1623 state->bs = bs; 1624 /* Paired with .clean() */ 1625 bdrv_drained_begin(bs); 1626 1627 format = backup->format; 1628 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) { 1629 format = bs->drv->format_name; 1630 } 1631 1632 /* Early check to avoid creating target */ 1633 bdrv_graph_rdlock_main_loop(); 1634 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 1635 bdrv_graph_rdunlock_main_loop(); 1636 return; 1637 } 1638 1639 flags = bs->open_flags | BDRV_O_RDWR; 1640 1641 /* 1642 * See if we have a backing HD we can use to create our new image 1643 * on top of. 1644 */ 1645 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 1646 /* 1647 * Backup will not replace the source by the target, so none 1648 * of the filters skipped here will be removed (in contrast to 1649 * mirror). Therefore, we can skip all of them when looking 1650 * for the first COW relationship. 1651 */ 1652 source = bdrv_cow_bs(bdrv_skip_filters(bs)); 1653 if (!source) { 1654 backup->sync = MIRROR_SYNC_MODE_FULL; 1655 } 1656 } 1657 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 1658 source = bs; 1659 flags |= BDRV_O_NO_BACKING; 1660 set_backing_hd = true; 1661 } 1662 bdrv_graph_rdunlock_main_loop(); 1663 1664 size = bdrv_getlength(bs); 1665 if (size < 0) { 1666 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1667 return; 1668 } 1669 1670 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 1671 assert(format); 1672 if (source) { 1673 /* Implicit filters should not appear in the filename */ 1674 BlockDriverState *explicit_backing; 1675 1676 bdrv_graph_rdlock_main_loop(); 1677 explicit_backing = bdrv_skip_implicit_filters(source); 1678 bdrv_refresh_filename(explicit_backing); 1679 bdrv_graph_rdunlock_main_loop(); 1680 1681 bdrv_img_create(backup->target, format, 1682 explicit_backing->filename, 1683 explicit_backing->drv->format_name, NULL, 1684 size, flags, false, &local_err); 1685 } else { 1686 bdrv_img_create(backup->target, format, NULL, NULL, NULL, 1687 size, flags, false, &local_err); 1688 } 1689 } 1690 1691 if (local_err) { 1692 error_propagate(errp, local_err); 1693 return; 1694 } 1695 1696 options = qdict_new(); 1697 qdict_put_str(options, "discard", "unmap"); 1698 qdict_put_str(options, "detect-zeroes", "unmap"); 1699 if (format) { 1700 qdict_put_str(options, "driver", format); 1701 } 1702 1703 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 1704 if (!target_bs) { 1705 return; 1706 } 1707 1708 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1709 if (ret < 0) { 1710 bdrv_unref(target_bs); 1711 return; 1712 } 1713 1714 if (set_backing_hd) { 1715 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { 1716 goto unref; 1717 } 1718 } 1719 1720 state->job = do_backup_common(qapi_DriveBackup_base(backup), 1721 bs, target_bs, aio_context, 1722 block_job_txn, errp); 1723 1724 unref: 1725 bdrv_unref(target_bs); 1726 } 1727 1728 static void drive_backup_commit(void *opaque) 1729 { 1730 DriveBackupState *state = opaque; 1731 1732 assert(state->job); 1733 job_start(&state->job->job); 1734 } 1735 1736 static void drive_backup_abort(void *opaque) 1737 { 1738 DriveBackupState *state = opaque; 1739 1740 if (state->job) { 1741 job_cancel_sync(&state->job->job, true); 1742 } 1743 } 1744 1745 static void drive_backup_clean(void *opaque) 1746 { 1747 g_autofree DriveBackupState *state = opaque; 1748 1749 if (!state->bs) { 1750 return; 1751 } 1752 1753 bdrv_drained_end(state->bs); 1754 } 1755 1756 typedef struct BlockdevBackupState { 1757 BlockDriverState *bs; 1758 BlockJob *job; 1759 } BlockdevBackupState; 1760 1761 static void blockdev_backup_commit(void *opaque); 1762 static void blockdev_backup_abort(void *opaque); 1763 static void blockdev_backup_clean(void *opaque); 1764 TransactionActionDrv blockdev_backup_drv = { 1765 .commit = blockdev_backup_commit, 1766 .abort = blockdev_backup_abort, 1767 .clean = blockdev_backup_clean, 1768 }; 1769 1770 static void blockdev_backup_action(BlockdevBackup *backup, 1771 JobTxn *block_job_txn, 1772 Transaction *tran, Error **errp) 1773 { 1774 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1); 1775 BlockDriverState *bs; 1776 BlockDriverState *target_bs; 1777 AioContext *aio_context; 1778 int ret; 1779 1780 tran_add(tran, &blockdev_backup_drv, state); 1781 1782 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1783 if (!bs) { 1784 return; 1785 } 1786 1787 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 1788 if (!target_bs) { 1789 return; 1790 } 1791 1792 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1793 aio_context = bdrv_get_aio_context(bs); 1794 1795 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1796 if (ret < 0) { 1797 return; 1798 } 1799 1800 state->bs = bs; 1801 1802 /* Paired with .clean() */ 1803 bdrv_drained_begin(state->bs); 1804 1805 state->job = do_backup_common(qapi_BlockdevBackup_base(backup), 1806 bs, target_bs, aio_context, 1807 block_job_txn, errp); 1808 } 1809 1810 static void blockdev_backup_commit(void *opaque) 1811 { 1812 BlockdevBackupState *state = opaque; 1813 1814 assert(state->job); 1815 job_start(&state->job->job); 1816 } 1817 1818 static void blockdev_backup_abort(void *opaque) 1819 { 1820 BlockdevBackupState *state = opaque; 1821 1822 if (state->job) { 1823 job_cancel_sync(&state->job->job, true); 1824 } 1825 } 1826 1827 static void blockdev_backup_clean(void *opaque) 1828 { 1829 g_autofree BlockdevBackupState *state = opaque; 1830 1831 if (!state->bs) { 1832 return; 1833 } 1834 1835 bdrv_drained_end(state->bs); 1836 } 1837 1838 typedef struct BlockDirtyBitmapState { 1839 BdrvDirtyBitmap *bitmap; 1840 BlockDriverState *bs; 1841 HBitmap *backup; 1842 bool was_enabled; 1843 } BlockDirtyBitmapState; 1844 1845 static void block_dirty_bitmap_add_abort(void *opaque); 1846 TransactionActionDrv block_dirty_bitmap_add_drv = { 1847 .abort = block_dirty_bitmap_add_abort, 1848 .clean = g_free, 1849 }; 1850 1851 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action, 1852 Transaction *tran, Error **errp) 1853 { 1854 Error *local_err = NULL; 1855 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1856 1857 tran_add(tran, &block_dirty_bitmap_add_drv, state); 1858 1859 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1860 qmp_block_dirty_bitmap_add(action->node, action->name, 1861 action->has_granularity, action->granularity, 1862 action->has_persistent, action->persistent, 1863 action->has_disabled, action->disabled, 1864 &local_err); 1865 1866 if (!local_err) { 1867 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name, 1868 NULL, &error_abort); 1869 } else { 1870 error_propagate(errp, local_err); 1871 } 1872 } 1873 1874 static void block_dirty_bitmap_add_abort(void *opaque) 1875 { 1876 BlockDirtyBitmapState *state = opaque; 1877 1878 if (state->bitmap) { 1879 bdrv_release_dirty_bitmap(state->bitmap); 1880 } 1881 } 1882 1883 static void block_dirty_bitmap_restore(void *opaque); 1884 static void block_dirty_bitmap_free_backup(void *opaque); 1885 TransactionActionDrv block_dirty_bitmap_clear_drv = { 1886 .abort = block_dirty_bitmap_restore, 1887 .commit = block_dirty_bitmap_free_backup, 1888 .clean = g_free, 1889 }; 1890 1891 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action, 1892 Transaction *tran, Error **errp) 1893 { 1894 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1895 1896 tran_add(tran, &block_dirty_bitmap_clear_drv, state); 1897 1898 state->bitmap = block_dirty_bitmap_lookup(action->node, 1899 action->name, 1900 &state->bs, 1901 errp); 1902 if (!state->bitmap) { 1903 return; 1904 } 1905 1906 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 1907 return; 1908 } 1909 1910 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 1911 } 1912 1913 static void block_dirty_bitmap_restore(void *opaque) 1914 { 1915 BlockDirtyBitmapState *state = opaque; 1916 1917 if (state->backup) { 1918 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 1919 } 1920 } 1921 1922 static void block_dirty_bitmap_free_backup(void *opaque) 1923 { 1924 BlockDirtyBitmapState *state = opaque; 1925 1926 hbitmap_free(state->backup); 1927 } 1928 1929 static void block_dirty_bitmap_enable_abort(void *opaque); 1930 TransactionActionDrv block_dirty_bitmap_enable_drv = { 1931 .abort = block_dirty_bitmap_enable_abort, 1932 .clean = g_free, 1933 }; 1934 1935 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action, 1936 Transaction *tran, Error **errp) 1937 { 1938 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1939 1940 tran_add(tran, &block_dirty_bitmap_enable_drv, state); 1941 1942 state->bitmap = block_dirty_bitmap_lookup(action->node, 1943 action->name, 1944 NULL, 1945 errp); 1946 if (!state->bitmap) { 1947 return; 1948 } 1949 1950 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 1951 return; 1952 } 1953 1954 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 1955 bdrv_enable_dirty_bitmap(state->bitmap); 1956 } 1957 1958 static void block_dirty_bitmap_enable_abort(void *opaque) 1959 { 1960 BlockDirtyBitmapState *state = opaque; 1961 1962 if (!state->was_enabled) { 1963 bdrv_disable_dirty_bitmap(state->bitmap); 1964 } 1965 } 1966 1967 static void block_dirty_bitmap_disable_abort(void *opaque); 1968 TransactionActionDrv block_dirty_bitmap_disable_drv = { 1969 .abort = block_dirty_bitmap_disable_abort, 1970 .clean = g_free, 1971 }; 1972 1973 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action, 1974 Transaction *tran, Error **errp) 1975 { 1976 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1977 1978 tran_add(tran, &block_dirty_bitmap_disable_drv, state); 1979 1980 state->bitmap = block_dirty_bitmap_lookup(action->node, 1981 action->name, 1982 NULL, 1983 errp); 1984 if (!state->bitmap) { 1985 return; 1986 } 1987 1988 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 1989 return; 1990 } 1991 1992 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 1993 bdrv_disable_dirty_bitmap(state->bitmap); 1994 } 1995 1996 static void block_dirty_bitmap_disable_abort(void *opaque) 1997 { 1998 BlockDirtyBitmapState *state = opaque; 1999 2000 if (state->was_enabled) { 2001 bdrv_enable_dirty_bitmap(state->bitmap); 2002 } 2003 } 2004 2005 TransactionActionDrv block_dirty_bitmap_merge_drv = { 2006 .commit = block_dirty_bitmap_free_backup, 2007 .abort = block_dirty_bitmap_restore, 2008 .clean = g_free, 2009 }; 2010 2011 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action, 2012 Transaction *tran, Error **errp) 2013 { 2014 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2015 2016 tran_add(tran, &block_dirty_bitmap_merge_drv, state); 2017 2018 state->bitmap = block_dirty_bitmap_merge(action->node, action->target, 2019 action->bitmaps, &state->backup, 2020 errp); 2021 } 2022 2023 static void block_dirty_bitmap_remove_commit(void *opaque); 2024 static void block_dirty_bitmap_remove_abort(void *opaque); 2025 TransactionActionDrv block_dirty_bitmap_remove_drv = { 2026 .commit = block_dirty_bitmap_remove_commit, 2027 .abort = block_dirty_bitmap_remove_abort, 2028 .clean = g_free, 2029 }; 2030 2031 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action, 2032 Transaction *tran, Error **errp) 2033 { 2034 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2035 2036 tran_add(tran, &block_dirty_bitmap_remove_drv, state); 2037 2038 2039 state->bitmap = block_dirty_bitmap_remove(action->node, action->name, 2040 false, &state->bs, errp); 2041 if (state->bitmap) { 2042 bdrv_dirty_bitmap_skip_store(state->bitmap, true); 2043 bdrv_dirty_bitmap_set_busy(state->bitmap, true); 2044 } 2045 } 2046 2047 static void block_dirty_bitmap_remove_abort(void *opaque) 2048 { 2049 BlockDirtyBitmapState *state = opaque; 2050 2051 if (state->bitmap) { 2052 bdrv_dirty_bitmap_skip_store(state->bitmap, false); 2053 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2054 } 2055 } 2056 2057 static void block_dirty_bitmap_remove_commit(void *opaque) 2058 { 2059 BlockDirtyBitmapState *state = opaque; 2060 2061 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2062 bdrv_release_dirty_bitmap(state->bitmap); 2063 } 2064 2065 static void abort_commit(void *opaque); 2066 TransactionActionDrv abort_drv = { 2067 .commit = abort_commit, 2068 }; 2069 2070 static void abort_action(Transaction *tran, Error **errp) 2071 { 2072 tran_add(tran, &abort_drv, NULL); 2073 error_setg(errp, "Transaction aborted using Abort action"); 2074 } 2075 2076 static void abort_commit(void *opaque) 2077 { 2078 g_assert_not_reached(); /* this action never succeeds */ 2079 } 2080 2081 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn, 2082 Transaction *tran, Error **errp) 2083 { 2084 switch (act->type) { 2085 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 2086 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 2087 external_snapshot_action(act, tran, errp); 2088 return; 2089 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP: 2090 drive_backup_action(act->u.drive_backup.data, 2091 block_job_txn, tran, errp); 2092 return; 2093 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP: 2094 blockdev_backup_action(act->u.blockdev_backup.data, 2095 block_job_txn, tran, errp); 2096 return; 2097 case TRANSACTION_ACTION_KIND_ABORT: 2098 abort_action(tran, errp); 2099 return; 2100 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC: 2101 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data, 2102 tran, errp); 2103 return; 2104 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD: 2105 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data, 2106 tran, errp); 2107 return; 2108 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR: 2109 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data, 2110 tran, errp); 2111 return; 2112 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE: 2113 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data, 2114 tran, errp); 2115 return; 2116 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE: 2117 block_dirty_bitmap_disable_action( 2118 act->u.block_dirty_bitmap_disable.data, tran, errp); 2119 return; 2120 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE: 2121 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data, 2122 tran, errp); 2123 return; 2124 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE: 2125 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data, 2126 tran, errp); 2127 return; 2128 /* 2129 * Where are transactions for MIRROR, COMMIT and STREAM? 2130 * Although these blockjobs use transaction callbacks like the backup job, 2131 * these jobs do not necessarily adhere to transaction semantics. 2132 * These jobs may not fully undo all of their actions on abort, nor do they 2133 * necessarily work in transactions with more than one job in them. 2134 */ 2135 case TRANSACTION_ACTION_KIND__MAX: 2136 default: 2137 g_assert_not_reached(); 2138 }; 2139 } 2140 2141 2142 /* 2143 * 'Atomic' group operations. The operations are performed as a set, and if 2144 * any fail then we roll back all operations in the group. 2145 * 2146 * Always run under BQL. 2147 */ 2148 void qmp_transaction(TransactionActionList *actions, 2149 struct TransactionProperties *properties, 2150 Error **errp) 2151 { 2152 TransactionActionList *act; 2153 JobTxn *block_job_txn = NULL; 2154 Error *local_err = NULL; 2155 Transaction *tran; 2156 ActionCompletionMode comp_mode = 2157 properties ? properties->completion_mode : 2158 ACTION_COMPLETION_MODE_INDIVIDUAL; 2159 2160 GLOBAL_STATE_CODE(); 2161 2162 /* Does this transaction get canceled as a group on failure? 2163 * If not, we don't really need to make a JobTxn. 2164 */ 2165 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2166 for (act = actions; act; act = act->next) { 2167 TransactionActionKind type = act->value->type; 2168 2169 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP && 2170 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP) 2171 { 2172 error_setg(errp, 2173 "Action '%s' does not support transaction property " 2174 "completion-mode = %s", 2175 TransactionActionKind_str(type), 2176 ActionCompletionMode_str(comp_mode)); 2177 return; 2178 } 2179 } 2180 2181 block_job_txn = job_txn_new(); 2182 } 2183 2184 /* drain all i/o before any operations */ 2185 bdrv_drain_all(); 2186 2187 tran = tran_new(); 2188 2189 /* We don't do anything in this loop that commits us to the operations */ 2190 for (act = actions; act; act = act->next) { 2191 transaction_action(act->value, block_job_txn, tran, &local_err); 2192 if (local_err) { 2193 error_propagate(errp, local_err); 2194 goto delete_and_fail; 2195 } 2196 } 2197 2198 tran_commit(tran); 2199 2200 /* success */ 2201 goto exit; 2202 2203 delete_and_fail: 2204 /* failure, and it is all-or-none; roll back all operations */ 2205 tran_abort(tran); 2206 exit: 2207 job_txn_unref(block_job_txn); 2208 } 2209 2210 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2211 const char *name, 2212 Error **errp) 2213 { 2214 BdrvDirtyBitmap *bitmap; 2215 BlockDriverState *bs; 2216 BlockDirtyBitmapSha256 *ret = NULL; 2217 char *sha256; 2218 2219 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2220 if (!bitmap || !bs) { 2221 return NULL; 2222 } 2223 2224 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2225 if (sha256 == NULL) { 2226 return NULL; 2227 } 2228 2229 ret = g_new(BlockDirtyBitmapSha256, 1); 2230 ret->sha256 = sha256; 2231 2232 return ret; 2233 } 2234 2235 void coroutine_fn qmp_block_resize(const char *device, const char *node_name, 2236 int64_t size, Error **errp) 2237 { 2238 Error *local_err = NULL; 2239 BlockBackend *blk; 2240 BlockDriverState *bs; 2241 AioContext *old_ctx; 2242 2243 bs = bdrv_lookup_bs(device, node_name, &local_err); 2244 if (local_err) { 2245 error_propagate(errp, local_err); 2246 return; 2247 } 2248 2249 if (size < 0) { 2250 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2251 return; 2252 } 2253 2254 bdrv_graph_co_rdlock(); 2255 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2256 error_setg(errp, QERR_DEVICE_IN_USE, device); 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 const char *bottom, 2282 bool has_speed, int64_t speed, 2283 bool has_on_error, BlockdevOnError on_error, 2284 const char *filter_node_name, 2285 bool has_auto_finalize, bool auto_finalize, 2286 bool has_auto_dismiss, bool auto_dismiss, 2287 Error **errp) 2288 { 2289 BlockDriverState *bs, *iter, *iter_end; 2290 BlockDriverState *base_bs = NULL; 2291 BlockDriverState *bottom_bs = NULL; 2292 AioContext *aio_context; 2293 Error *local_err = NULL; 2294 int job_flags = JOB_DEFAULT; 2295 2296 GLOBAL_STATE_CODE(); 2297 2298 if (base && base_node) { 2299 error_setg(errp, "'base' and 'base-node' cannot be specified " 2300 "at the same time"); 2301 return; 2302 } 2303 2304 if (base && bottom) { 2305 error_setg(errp, "'base' and 'bottom' cannot be specified " 2306 "at the same time"); 2307 return; 2308 } 2309 2310 if (bottom && base_node) { 2311 error_setg(errp, "'bottom' and 'base-node' cannot be specified " 2312 "at the same time"); 2313 return; 2314 } 2315 2316 if (!has_on_error) { 2317 on_error = BLOCKDEV_ON_ERROR_REPORT; 2318 } 2319 2320 bs = bdrv_lookup_bs(device, device, errp); 2321 if (!bs) { 2322 return; 2323 } 2324 2325 aio_context = bdrv_get_aio_context(bs); 2326 2327 bdrv_graph_rdlock_main_loop(); 2328 if (base) { 2329 base_bs = bdrv_find_backing_image(bs, base); 2330 if (base_bs == NULL) { 2331 error_setg(errp, "Can't find '%s' in the backing chain", base); 2332 goto out_rdlock; 2333 } 2334 assert(bdrv_get_aio_context(base_bs) == aio_context); 2335 } 2336 2337 if (base_node) { 2338 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2339 if (!base_bs) { 2340 goto out_rdlock; 2341 } 2342 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 2343 error_setg(errp, "Node '%s' is not a backing image of '%s'", 2344 base_node, device); 2345 goto out_rdlock; 2346 } 2347 assert(bdrv_get_aio_context(base_bs) == aio_context); 2348 2349 bdrv_refresh_filename(base_bs); 2350 } 2351 2352 if (bottom) { 2353 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); 2354 if (!bottom_bs) { 2355 goto out_rdlock; 2356 } 2357 if (!bottom_bs->drv) { 2358 error_setg(errp, "Node '%s' is not open", bottom); 2359 goto out_rdlock; 2360 } 2361 if (bottom_bs->drv->is_filter) { 2362 error_setg(errp, "Node '%s' is a filter, use a non-filter node " 2363 "as 'bottom'", bottom); 2364 goto out_rdlock; 2365 } 2366 if (!bdrv_chain_contains(bs, bottom_bs)) { 2367 error_setg(errp, "Node '%s' is not in a chain starting from '%s'", 2368 bottom, device); 2369 goto out_rdlock; 2370 } 2371 assert(bdrv_get_aio_context(bottom_bs) == aio_context); 2372 } 2373 2374 /* 2375 * Check for op blockers in the whole chain between bs and base (or bottom) 2376 */ 2377 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; 2378 for (iter = bs; iter && iter != iter_end; 2379 iter = bdrv_filter_or_cow_bs(iter)) 2380 { 2381 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 2382 goto out_rdlock; 2383 } 2384 } 2385 bdrv_graph_rdunlock_main_loop(); 2386 2387 /* if we are streaming the entire chain, the result will have no backing 2388 * file, and specifying one is therefore an error */ 2389 if (!base_bs && backing_file) { 2390 error_setg(errp, "backing file specified, but streaming the " 2391 "entire chain"); 2392 return; 2393 } 2394 2395 if (has_auto_finalize && !auto_finalize) { 2396 job_flags |= JOB_MANUAL_FINALIZE; 2397 } 2398 if (has_auto_dismiss && !auto_dismiss) { 2399 job_flags |= JOB_MANUAL_DISMISS; 2400 } 2401 2402 stream_start(job_id, bs, base_bs, backing_file, 2403 bottom_bs, job_flags, has_speed ? speed : 0, on_error, 2404 filter_node_name, &local_err); 2405 if (local_err) { 2406 error_propagate(errp, local_err); 2407 return; 2408 } 2409 2410 trace_qmp_block_stream(bs); 2411 return; 2412 2413 out_rdlock: 2414 bdrv_graph_rdunlock_main_loop(); 2415 } 2416 2417 void qmp_block_commit(const char *job_id, const char *device, 2418 const char *base_node, 2419 const char *base, 2420 const char *top_node, 2421 const char *top, 2422 const char *backing_file, 2423 bool has_speed, int64_t speed, 2424 bool has_on_error, BlockdevOnError on_error, 2425 const char *filter_node_name, 2426 bool has_auto_finalize, bool auto_finalize, 2427 bool has_auto_dismiss, bool auto_dismiss, 2428 Error **errp) 2429 { 2430 BlockDriverState *bs; 2431 BlockDriverState *iter; 2432 BlockDriverState *base_bs, *top_bs; 2433 AioContext *aio_context; 2434 Error *local_err = NULL; 2435 int job_flags = JOB_DEFAULT; 2436 uint64_t top_perm, top_shared; 2437 2438 /* TODO We'll eventually have to take a writer lock in this function */ 2439 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2440 2441 if (!has_speed) { 2442 speed = 0; 2443 } 2444 if (!has_on_error) { 2445 on_error = BLOCKDEV_ON_ERROR_REPORT; 2446 } 2447 if (has_auto_finalize && !auto_finalize) { 2448 job_flags |= JOB_MANUAL_FINALIZE; 2449 } 2450 if (has_auto_dismiss && !auto_dismiss) { 2451 job_flags |= JOB_MANUAL_DISMISS; 2452 } 2453 2454 /* Important Note: 2455 * libvirt relies on the DeviceNotFound error class in order to probe for 2456 * live commit feature versions; for this to work, we must make sure to 2457 * perform the device lookup before any generic errors that may occur in a 2458 * scenario in which all optional arguments are omitted. */ 2459 bs = qmp_get_root_bs(device, &local_err); 2460 if (!bs) { 2461 bs = bdrv_lookup_bs(device, device, NULL); 2462 if (!bs) { 2463 error_free(local_err); 2464 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2465 "Device '%s' not found", device); 2466 } else { 2467 error_propagate(errp, local_err); 2468 } 2469 return; 2470 } 2471 2472 aio_context = bdrv_get_aio_context(bs); 2473 2474 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2475 return; 2476 } 2477 2478 /* default top_bs is the active layer */ 2479 top_bs = bs; 2480 2481 if (top_node && top) { 2482 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 2483 return; 2484 } else if (top_node) { 2485 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 2486 if (top_bs == NULL) { 2487 return; 2488 } 2489 if (!bdrv_chain_contains(bs, top_bs)) { 2490 error_setg(errp, "'%s' is not in this backing file chain", 2491 top_node); 2492 return; 2493 } 2494 } else if (top) { 2495 /* This strcmp() is just a shortcut, there is no need to 2496 * refresh @bs's filename. If it mismatches, 2497 * bdrv_find_backing_image() will do the refresh and may still 2498 * return @bs. */ 2499 if (strcmp(bs->filename, top) != 0) { 2500 top_bs = bdrv_find_backing_image(bs, top); 2501 } 2502 } 2503 2504 if (top_bs == NULL) { 2505 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2506 return; 2507 } 2508 2509 assert(bdrv_get_aio_context(top_bs) == aio_context); 2510 2511 if (base_node && base) { 2512 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 2513 return; 2514 } else if (base_node) { 2515 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2516 if (base_bs == NULL) { 2517 return; 2518 } 2519 if (!bdrv_chain_contains(top_bs, base_bs)) { 2520 error_setg(errp, "'%s' is not in this backing file chain", 2521 base_node); 2522 return; 2523 } 2524 } else if (base) { 2525 base_bs = bdrv_find_backing_image(top_bs, base); 2526 if (base_bs == NULL) { 2527 error_setg(errp, "Can't find '%s' in the backing chain", base); 2528 return; 2529 } 2530 } else { 2531 base_bs = bdrv_find_base(top_bs); 2532 if (base_bs == NULL) { 2533 error_setg(errp, "There is no backimg image"); 2534 return; 2535 } 2536 } 2537 2538 assert(bdrv_get_aio_context(base_bs) == aio_context); 2539 2540 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); 2541 iter = bdrv_filter_or_cow_bs(iter)) 2542 { 2543 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2544 return; 2545 } 2546 } 2547 2548 /* Do not allow attempts to commit an image into itself */ 2549 if (top_bs == base_bs) { 2550 error_setg(errp, "cannot commit an image into itself"); 2551 return; 2552 } 2553 2554 /* 2555 * Active commit is required if and only if someone has taken a 2556 * WRITE permission on the top node. Historically, we have always 2557 * used active commit for top nodes, so continue that practice 2558 * lest we possibly break clients that rely on this behavior, e.g. 2559 * to later attach this node to a writing parent. 2560 * (Active commit is never really wrong.) 2561 */ 2562 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); 2563 if (top_perm & BLK_PERM_WRITE || 2564 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) 2565 { 2566 if (backing_file) { 2567 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { 2568 error_setg(errp, "'backing-file' specified," 2569 " but 'top' is the active layer"); 2570 } else { 2571 error_setg(errp, "'backing-file' specified, but 'top' has a " 2572 "writer on it"); 2573 } 2574 return; 2575 } 2576 if (!job_id) { 2577 /* 2578 * Emulate here what block_job_create() does, because it 2579 * is possible that @bs != @top_bs (the block job should 2580 * be named after @bs, even if @top_bs is the actual 2581 * source) 2582 */ 2583 job_id = bdrv_get_device_name(bs); 2584 } 2585 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, 2586 filter_node_name, NULL, NULL, false, &local_err); 2587 } else { 2588 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 2589 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2590 return; 2591 } 2592 commit_start(job_id, bs, base_bs, top_bs, job_flags, 2593 speed, on_error, backing_file, 2594 filter_node_name, &local_err); 2595 } 2596 if (local_err != NULL) { 2597 error_propagate(errp, local_err); 2598 return; 2599 } 2600 } 2601 2602 /* Common QMP interface for drive-backup and blockdev-backup */ 2603 static BlockJob *do_backup_common(BackupCommon *backup, 2604 BlockDriverState *bs, 2605 BlockDriverState *target_bs, 2606 AioContext *aio_context, 2607 JobTxn *txn, Error **errp) 2608 { 2609 BlockJob *job = NULL; 2610 BdrvDirtyBitmap *bmap = NULL; 2611 BackupPerf perf = { .max_workers = 64 }; 2612 int job_flags = JOB_DEFAULT; 2613 2614 if (!backup->has_speed) { 2615 backup->speed = 0; 2616 } 2617 if (!backup->has_on_source_error) { 2618 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2619 } 2620 if (!backup->has_on_target_error) { 2621 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2622 } 2623 if (!backup->has_auto_finalize) { 2624 backup->auto_finalize = true; 2625 } 2626 if (!backup->has_auto_dismiss) { 2627 backup->auto_dismiss = true; 2628 } 2629 if (!backup->has_compress) { 2630 backup->compress = false; 2631 } 2632 2633 if (backup->x_perf) { 2634 if (backup->x_perf->has_use_copy_range) { 2635 perf.use_copy_range = backup->x_perf->use_copy_range; 2636 } 2637 if (backup->x_perf->has_max_workers) { 2638 perf.max_workers = backup->x_perf->max_workers; 2639 } 2640 if (backup->x_perf->has_max_chunk) { 2641 perf.max_chunk = backup->x_perf->max_chunk; 2642 } 2643 } 2644 2645 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || 2646 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { 2647 /* done before desugaring 'incremental' to print the right message */ 2648 if (!backup->bitmap) { 2649 error_setg(errp, "must provide a valid bitmap name for " 2650 "'%s' sync mode", MirrorSyncMode_str(backup->sync)); 2651 return NULL; 2652 } 2653 } 2654 2655 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { 2656 if (backup->has_bitmap_mode && 2657 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { 2658 error_setg(errp, "Bitmap sync mode must be '%s' " 2659 "when using sync mode '%s'", 2660 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), 2661 MirrorSyncMode_str(backup->sync)); 2662 return NULL; 2663 } 2664 backup->has_bitmap_mode = true; 2665 backup->sync = MIRROR_SYNC_MODE_BITMAP; 2666 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; 2667 } 2668 2669 if (backup->bitmap) { 2670 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 2671 if (!bmap) { 2672 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 2673 return NULL; 2674 } 2675 if (!backup->has_bitmap_mode) { 2676 error_setg(errp, "Bitmap sync mode must be given " 2677 "when providing a bitmap"); 2678 return NULL; 2679 } 2680 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2681 return NULL; 2682 } 2683 2684 /* This does not produce a useful bitmap artifact: */ 2685 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 2686 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" 2687 " outputs", MirrorSyncMode_str(backup->sync)); 2688 return NULL; 2689 } 2690 2691 /* If the bitmap isn't used for input or output, this is useless: */ 2692 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && 2693 backup->sync != MIRROR_SYNC_MODE_BITMAP) { 2694 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" 2695 " when combined with sync mode '%s'", 2696 BitmapSyncMode_str(backup->bitmap_mode), 2697 MirrorSyncMode_str(backup->sync)); 2698 return NULL; 2699 } 2700 } 2701 2702 if (!backup->bitmap && backup->has_bitmap_mode) { 2703 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); 2704 return NULL; 2705 } 2706 2707 if (!backup->auto_finalize) { 2708 job_flags |= JOB_MANUAL_FINALIZE; 2709 } 2710 if (!backup->auto_dismiss) { 2711 job_flags |= JOB_MANUAL_DISMISS; 2712 } 2713 2714 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 2715 backup->sync, bmap, backup->bitmap_mode, 2716 backup->compress, 2717 backup->filter_node_name, 2718 &perf, 2719 backup->on_source_error, 2720 backup->on_target_error, 2721 job_flags, NULL, NULL, txn, errp); 2722 return job; 2723 } 2724 2725 void qmp_drive_backup(DriveBackup *backup, Error **errp) 2726 { 2727 TransactionAction action = { 2728 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, 2729 .u.drive_backup.data = backup, 2730 }; 2731 blockdev_do_action(&action, errp); 2732 } 2733 2734 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, 2735 bool flat, 2736 Error **errp) 2737 { 2738 bool return_flat = has_flat && flat; 2739 2740 return bdrv_named_nodes_list(return_flat, errp); 2741 } 2742 2743 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 2744 { 2745 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2746 2747 return bdrv_get_xdbg_block_graph(errp); 2748 } 2749 2750 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) 2751 { 2752 TransactionAction action = { 2753 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, 2754 .u.blockdev_backup.data = backup, 2755 }; 2756 blockdev_do_action(&action, errp); 2757 } 2758 2759 /* Parameter check and block job starting for drive mirroring. 2760 * Caller should hold @device and @target's aio context (must be the same). 2761 **/ 2762 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 2763 BlockDriverState *target, 2764 const char *replaces, 2765 enum MirrorSyncMode sync, 2766 BlockMirrorBackingMode backing_mode, 2767 bool zero_target, 2768 bool has_speed, int64_t speed, 2769 bool has_granularity, uint32_t granularity, 2770 bool has_buf_size, int64_t buf_size, 2771 bool has_on_source_error, 2772 BlockdevOnError on_source_error, 2773 bool has_on_target_error, 2774 BlockdevOnError on_target_error, 2775 bool has_unmap, bool unmap, 2776 const char *filter_node_name, 2777 bool has_copy_mode, MirrorCopyMode copy_mode, 2778 bool has_auto_finalize, bool auto_finalize, 2779 bool has_auto_dismiss, bool auto_dismiss, 2780 Error **errp) 2781 { 2782 BlockDriverState *unfiltered_bs; 2783 int job_flags = JOB_DEFAULT; 2784 2785 GLOBAL_STATE_CODE(); 2786 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2787 2788 if (!has_speed) { 2789 speed = 0; 2790 } 2791 if (!has_on_source_error) { 2792 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2793 } 2794 if (!has_on_target_error) { 2795 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2796 } 2797 if (!has_granularity) { 2798 granularity = 0; 2799 } 2800 if (!has_buf_size) { 2801 buf_size = 0; 2802 } 2803 if (!has_unmap) { 2804 unmap = true; 2805 } 2806 if (!has_copy_mode) { 2807 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 2808 } 2809 if (has_auto_finalize && !auto_finalize) { 2810 job_flags |= JOB_MANUAL_FINALIZE; 2811 } 2812 if (has_auto_dismiss && !auto_dismiss) { 2813 job_flags |= JOB_MANUAL_DISMISS; 2814 } 2815 2816 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2817 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2818 "a value in range [512B, 64MB]"); 2819 return; 2820 } 2821 if (granularity & (granularity - 1)) { 2822 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2823 "a power of 2"); 2824 return; 2825 } 2826 2827 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2828 return; 2829 } 2830 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 2831 return; 2832 } 2833 2834 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { 2835 sync = MIRROR_SYNC_MODE_FULL; 2836 } 2837 2838 if (!replaces) { 2839 /* We want to mirror from @bs, but keep implicit filters on top */ 2840 unfiltered_bs = bdrv_skip_implicit_filters(bs); 2841 if (unfiltered_bs != bs) { 2842 replaces = unfiltered_bs->node_name; 2843 } 2844 } 2845 2846 if (replaces) { 2847 BlockDriverState *to_replace_bs; 2848 int64_t bs_size, replace_size; 2849 2850 bs_size = bdrv_getlength(bs); 2851 if (bs_size < 0) { 2852 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 2853 return; 2854 } 2855 2856 to_replace_bs = check_to_replace_node(bs, replaces, errp); 2857 if (!to_replace_bs) { 2858 return; 2859 } 2860 2861 replace_size = bdrv_getlength(to_replace_bs); 2862 2863 if (replace_size < 0) { 2864 error_setg_errno(errp, -replace_size, 2865 "Failed to query the replacement node's size"); 2866 return; 2867 } 2868 if (bs_size != replace_size) { 2869 error_setg(errp, "cannot replace image with a mirror image of " 2870 "different size"); 2871 return; 2872 } 2873 } 2874 2875 /* pass the node name to replace to mirror start since it's loose coupling 2876 * and will allow to check whether the node still exist at mirror completion 2877 */ 2878 mirror_start(job_id, bs, target, 2879 replaces, job_flags, 2880 speed, granularity, buf_size, sync, backing_mode, zero_target, 2881 on_source_error, on_target_error, unmap, filter_node_name, 2882 copy_mode, errp); 2883 } 2884 2885 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 2886 { 2887 BlockDriverState *bs; 2888 BlockDriverState *target_backing_bs, *target_bs; 2889 AioContext *aio_context; 2890 BlockMirrorBackingMode backing_mode; 2891 Error *local_err = NULL; 2892 QDict *options = NULL; 2893 int flags; 2894 int64_t size; 2895 const char *format = arg->format; 2896 bool zero_target; 2897 int ret; 2898 2899 bs = qmp_get_root_bs(arg->device, errp); 2900 if (!bs) { 2901 return; 2902 } 2903 2904 /* Early check to avoid creating target */ 2905 bdrv_graph_rdlock_main_loop(); 2906 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2907 bdrv_graph_rdunlock_main_loop(); 2908 return; 2909 } 2910 2911 aio_context = bdrv_get_aio_context(bs); 2912 2913 if (!arg->has_mode) { 2914 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2915 } 2916 2917 if (!arg->format) { 2918 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 2919 ? NULL : bs->drv->format_name); 2920 } 2921 2922 flags = bs->open_flags | BDRV_O_RDWR; 2923 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); 2924 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { 2925 arg->sync = MIRROR_SYNC_MODE_FULL; 2926 } 2927 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 2928 target_backing_bs = bs; 2929 } 2930 bdrv_graph_rdunlock_main_loop(); 2931 2932 size = bdrv_getlength(bs); 2933 if (size < 0) { 2934 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2935 return; 2936 } 2937 2938 if (arg->replaces) { 2939 if (!arg->node_name) { 2940 error_setg(errp, "a node-name must be provided when replacing a" 2941 " named node of the graph"); 2942 return; 2943 } 2944 } 2945 2946 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 2947 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 2948 } else { 2949 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 2950 } 2951 2952 /* Don't open backing image in create() */ 2953 flags |= BDRV_O_NO_BACKING; 2954 2955 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) 2956 && arg->mode != NEW_IMAGE_MODE_EXISTING) 2957 { 2958 /* create new image w/o backing file */ 2959 assert(format); 2960 bdrv_img_create(arg->target, format, 2961 NULL, NULL, NULL, size, flags, false, &local_err); 2962 } else { 2963 BlockDriverState *explicit_backing; 2964 2965 switch (arg->mode) { 2966 case NEW_IMAGE_MODE_EXISTING: 2967 break; 2968 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2969 /* 2970 * Create new image with backing file. 2971 * Implicit filters should not appear in the filename. 2972 */ 2973 bdrv_graph_rdlock_main_loop(); 2974 explicit_backing = bdrv_skip_implicit_filters(target_backing_bs); 2975 bdrv_refresh_filename(explicit_backing); 2976 bdrv_graph_rdunlock_main_loop(); 2977 2978 bdrv_img_create(arg->target, format, 2979 explicit_backing->filename, 2980 explicit_backing->drv->format_name, 2981 NULL, size, flags, false, &local_err); 2982 break; 2983 default: 2984 abort(); 2985 } 2986 } 2987 2988 if (local_err) { 2989 error_propagate(errp, local_err); 2990 return; 2991 } 2992 2993 options = qdict_new(); 2994 if (arg->node_name) { 2995 qdict_put_str(options, "node-name", arg->node_name); 2996 } 2997 if (format) { 2998 qdict_put_str(options, "driver", format); 2999 } 3000 3001 /* Mirroring takes care of copy-on-write using the source's backing 3002 * file. 3003 */ 3004 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3005 if (!target_bs) { 3006 return; 3007 } 3008 3009 bdrv_graph_rdlock_main_loop(); 3010 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && 3011 (arg->mode == NEW_IMAGE_MODE_EXISTING || 3012 !bdrv_has_zero_init(target_bs))); 3013 bdrv_graph_rdunlock_main_loop(); 3014 3015 3016 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3017 if (ret < 0) { 3018 bdrv_unref(target_bs); 3019 return; 3020 } 3021 3022 blockdev_mirror_common(arg->job_id, bs, target_bs, 3023 arg->replaces, arg->sync, 3024 backing_mode, zero_target, 3025 arg->has_speed, arg->speed, 3026 arg->has_granularity, arg->granularity, 3027 arg->has_buf_size, arg->buf_size, 3028 arg->has_on_source_error, arg->on_source_error, 3029 arg->has_on_target_error, arg->on_target_error, 3030 arg->has_unmap, arg->unmap, 3031 NULL, 3032 arg->has_copy_mode, arg->copy_mode, 3033 arg->has_auto_finalize, arg->auto_finalize, 3034 arg->has_auto_dismiss, arg->auto_dismiss, 3035 errp); 3036 bdrv_unref(target_bs); 3037 } 3038 3039 void qmp_blockdev_mirror(const char *job_id, 3040 const char *device, const char *target, 3041 const char *replaces, 3042 MirrorSyncMode sync, 3043 bool has_speed, int64_t speed, 3044 bool has_granularity, uint32_t granularity, 3045 bool has_buf_size, int64_t buf_size, 3046 bool has_on_source_error, 3047 BlockdevOnError on_source_error, 3048 bool has_on_target_error, 3049 BlockdevOnError on_target_error, 3050 const char *filter_node_name, 3051 bool has_copy_mode, MirrorCopyMode copy_mode, 3052 bool has_auto_finalize, bool auto_finalize, 3053 bool has_auto_dismiss, bool auto_dismiss, 3054 Error **errp) 3055 { 3056 BlockDriverState *bs; 3057 BlockDriverState *target_bs; 3058 AioContext *aio_context; 3059 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3060 bool zero_target; 3061 int ret; 3062 3063 bs = qmp_get_root_bs(device, errp); 3064 if (!bs) { 3065 return; 3066 } 3067 3068 target_bs = bdrv_lookup_bs(target, target, errp); 3069 if (!target_bs) { 3070 return; 3071 } 3072 3073 zero_target = (sync == MIRROR_SYNC_MODE_FULL); 3074 3075 aio_context = bdrv_get_aio_context(bs); 3076 3077 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3078 if (ret < 0) { 3079 return; 3080 } 3081 3082 blockdev_mirror_common(job_id, bs, target_bs, 3083 replaces, sync, backing_mode, 3084 zero_target, has_speed, speed, 3085 has_granularity, granularity, 3086 has_buf_size, buf_size, 3087 has_on_source_error, on_source_error, 3088 has_on_target_error, on_target_error, 3089 true, true, filter_node_name, 3090 has_copy_mode, copy_mode, 3091 has_auto_finalize, auto_finalize, 3092 has_auto_dismiss, auto_dismiss, 3093 errp); 3094 } 3095 3096 /* 3097 * Get a block job using its ID. Called with job_mutex held. 3098 */ 3099 static BlockJob *find_block_job_locked(const char *id, Error **errp) 3100 { 3101 BlockJob *job; 3102 3103 assert(id != NULL); 3104 3105 job = block_job_get_locked(id); 3106 3107 if (!job) { 3108 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3109 "Block job '%s' not found", id); 3110 return NULL; 3111 } 3112 3113 return job; 3114 } 3115 3116 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3117 { 3118 BlockJob *job; 3119 3120 JOB_LOCK_GUARD(); 3121 job = find_block_job_locked(device, errp); 3122 3123 if (!job) { 3124 return; 3125 } 3126 3127 block_job_set_speed_locked(job, speed, errp); 3128 } 3129 3130 void qmp_block_job_cancel(const char *device, 3131 bool has_force, bool force, Error **errp) 3132 { 3133 BlockJob *job; 3134 3135 JOB_LOCK_GUARD(); 3136 job = find_block_job_locked(device, errp); 3137 3138 if (!job) { 3139 return; 3140 } 3141 3142 if (!has_force) { 3143 force = false; 3144 } 3145 3146 if (job_user_paused_locked(&job->job) && !force) { 3147 error_setg(errp, "The block job for device '%s' is currently paused", 3148 device); 3149 return; 3150 } 3151 3152 trace_qmp_block_job_cancel(job); 3153 job_user_cancel_locked(&job->job, force, errp); 3154 } 3155 3156 void qmp_block_job_pause(const char *device, Error **errp) 3157 { 3158 BlockJob *job; 3159 3160 JOB_LOCK_GUARD(); 3161 job = find_block_job_locked(device, errp); 3162 3163 if (!job) { 3164 return; 3165 } 3166 3167 trace_qmp_block_job_pause(job); 3168 job_user_pause_locked(&job->job, errp); 3169 } 3170 3171 void qmp_block_job_resume(const char *device, Error **errp) 3172 { 3173 BlockJob *job; 3174 3175 JOB_LOCK_GUARD(); 3176 job = find_block_job_locked(device, errp); 3177 3178 if (!job) { 3179 return; 3180 } 3181 3182 trace_qmp_block_job_resume(job); 3183 job_user_resume_locked(&job->job, errp); 3184 } 3185 3186 void qmp_block_job_complete(const char *device, Error **errp) 3187 { 3188 BlockJob *job; 3189 3190 JOB_LOCK_GUARD(); 3191 job = find_block_job_locked(device, errp); 3192 3193 if (!job) { 3194 return; 3195 } 3196 3197 trace_qmp_block_job_complete(job); 3198 job_complete_locked(&job->job, errp); 3199 } 3200 3201 void qmp_block_job_finalize(const char *id, Error **errp) 3202 { 3203 BlockJob *job; 3204 3205 JOB_LOCK_GUARD(); 3206 job = find_block_job_locked(id, errp); 3207 3208 if (!job) { 3209 return; 3210 } 3211 3212 trace_qmp_block_job_finalize(job); 3213 job_ref_locked(&job->job); 3214 job_finalize_locked(&job->job, errp); 3215 3216 job_unref_locked(&job->job); 3217 } 3218 3219 void qmp_block_job_dismiss(const char *id, Error **errp) 3220 { 3221 BlockJob *bjob; 3222 Job *job; 3223 3224 JOB_LOCK_GUARD(); 3225 bjob = find_block_job_locked(id, errp); 3226 3227 if (!bjob) { 3228 return; 3229 } 3230 3231 trace_qmp_block_job_dismiss(bjob); 3232 job = &bjob->job; 3233 job_dismiss_locked(&job, errp); 3234 } 3235 3236 void qmp_block_job_change(BlockJobChangeOptions *opts, Error **errp) 3237 { 3238 BlockJob *job; 3239 3240 JOB_LOCK_GUARD(); 3241 job = find_block_job_locked(opts->id, errp); 3242 3243 if (!job) { 3244 return; 3245 } 3246 3247 block_job_change_locked(job, opts, errp); 3248 } 3249 3250 void qmp_change_backing_file(const char *device, 3251 const char *image_node_name, 3252 const char *backing_file, 3253 Error **errp) 3254 { 3255 BlockDriverState *bs = NULL; 3256 BlockDriverState *image_bs = NULL; 3257 Error *local_err = NULL; 3258 bool ro; 3259 int ret; 3260 3261 bs = qmp_get_root_bs(device, errp); 3262 if (!bs) { 3263 return; 3264 } 3265 3266 bdrv_graph_rdlock_main_loop(); 3267 3268 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3269 if (local_err) { 3270 error_propagate(errp, local_err); 3271 goto out_rdlock; 3272 } 3273 3274 if (!image_bs) { 3275 error_setg(errp, "image file not found"); 3276 goto out_rdlock; 3277 } 3278 3279 if (bdrv_find_base(image_bs) == image_bs) { 3280 error_setg(errp, "not allowing backing file change on an image " 3281 "without a backing file"); 3282 goto out_rdlock; 3283 } 3284 3285 /* even though we are not necessarily operating on bs, we need it to 3286 * determine if block ops are currently prohibited on the chain */ 3287 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3288 goto out_rdlock; 3289 } 3290 3291 /* final sanity check */ 3292 if (!bdrv_chain_contains(bs, image_bs)) { 3293 error_setg(errp, "'%s' and image file are not in the same chain", 3294 device); 3295 goto out_rdlock; 3296 } 3297 bdrv_graph_rdunlock_main_loop(); 3298 3299 /* if not r/w, reopen to make r/w */ 3300 ro = bdrv_is_read_only(image_bs); 3301 3302 if (ro) { 3303 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 3304 return; 3305 } 3306 } 3307 3308 ret = bdrv_change_backing_file(image_bs, backing_file, 3309 image_bs->drv ? image_bs->drv->format_name : "", 3310 false); 3311 3312 if (ret < 0) { 3313 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3314 backing_file); 3315 /* don't exit here, so we can try to restore open flags if 3316 * appropriate */ 3317 } 3318 3319 if (ro) { 3320 bdrv_reopen_set_read_only(image_bs, true, errp); 3321 } 3322 return; 3323 3324 out_rdlock: 3325 bdrv_graph_rdunlock_main_loop(); 3326 } 3327 3328 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3329 { 3330 BlockDriverState *bs; 3331 QObject *obj; 3332 Visitor *v = qobject_output_visitor_new(&obj); 3333 QDict *qdict; 3334 3335 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3336 visit_complete(v, &obj); 3337 qdict = qobject_to(QDict, obj); 3338 3339 qdict_flatten(qdict); 3340 3341 if (!qdict_get_try_str(qdict, "node-name")) { 3342 error_setg(errp, "'node-name' must be specified for the root node"); 3343 goto fail; 3344 } 3345 3346 bs = bds_tree_init(qdict, errp); 3347 if (!bs) { 3348 goto fail; 3349 } 3350 3351 bdrv_set_monitor_owned(bs); 3352 3353 fail: 3354 visit_free(v); 3355 } 3356 3357 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp) 3358 { 3359 BlockReopenQueue *queue = NULL; 3360 3361 /* Add each one of the BDS that we want to reopen to the queue */ 3362 for (; reopen_list != NULL; reopen_list = reopen_list->next) { 3363 BlockdevOptions *options = reopen_list->value; 3364 BlockDriverState *bs; 3365 QObject *obj; 3366 Visitor *v; 3367 QDict *qdict; 3368 3369 /* Check for the selected node name */ 3370 if (!options->node_name) { 3371 error_setg(errp, "node-name not specified"); 3372 goto fail; 3373 } 3374 3375 bs = bdrv_find_node(options->node_name); 3376 if (!bs) { 3377 error_setg(errp, "Failed to find node with node-name='%s'", 3378 options->node_name); 3379 goto fail; 3380 } 3381 3382 /* Put all options in a QDict and flatten it */ 3383 v = qobject_output_visitor_new(&obj); 3384 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3385 visit_complete(v, &obj); 3386 visit_free(v); 3387 3388 qdict = qobject_to(QDict, obj); 3389 3390 qdict_flatten(qdict); 3391 3392 queue = bdrv_reopen_queue(queue, bs, qdict, false); 3393 } 3394 3395 /* Perform the reopen operation */ 3396 bdrv_reopen_multiple(queue, errp); 3397 queue = NULL; 3398 3399 fail: 3400 bdrv_reopen_queue_free(queue); 3401 } 3402 3403 void qmp_blockdev_del(const char *node_name, Error **errp) 3404 { 3405 BlockDriverState *bs; 3406 3407 GLOBAL_STATE_CODE(); 3408 GRAPH_RDLOCK_GUARD_MAINLOOP(); 3409 3410 bs = bdrv_find_node(node_name); 3411 if (!bs) { 3412 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3413 return; 3414 } 3415 if (bdrv_has_blk(bs)) { 3416 error_setg(errp, "Node %s is in use", node_name); 3417 return; 3418 } 3419 3420 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 3421 return; 3422 } 3423 3424 if (!QTAILQ_IN_USE(bs, monitor_list)) { 3425 error_setg(errp, "Node %s is not owned by the monitor", 3426 bs->node_name); 3427 return; 3428 } 3429 3430 if (bs->refcnt > 1) { 3431 error_setg(errp, "Block device %s is in use", 3432 bdrv_get_device_or_node_name(bs)); 3433 return; 3434 } 3435 3436 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 3437 bdrv_unref(bs); 3438 } 3439 3440 static BdrvChild * GRAPH_RDLOCK 3441 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name) 3442 { 3443 BdrvChild *child; 3444 3445 QLIST_FOREACH(child, &parent_bs->children, next) { 3446 if (strcmp(child->name, child_name) == 0) { 3447 return child; 3448 } 3449 } 3450 3451 return NULL; 3452 } 3453 3454 void qmp_x_blockdev_change(const char *parent, const char *child, 3455 const char *node, Error **errp) 3456 { 3457 BlockDriverState *parent_bs, *new_bs = NULL; 3458 BdrvChild *p_child; 3459 3460 bdrv_graph_wrlock(); 3461 3462 parent_bs = bdrv_lookup_bs(parent, parent, errp); 3463 if (!parent_bs) { 3464 goto out; 3465 } 3466 3467 if (!child == !node) { 3468 if (child) { 3469 error_setg(errp, "The parameters child and node are in conflict"); 3470 } else { 3471 error_setg(errp, "Either child or node must be specified"); 3472 } 3473 goto out; 3474 } 3475 3476 if (child) { 3477 p_child = bdrv_find_child(parent_bs, child); 3478 if (!p_child) { 3479 error_setg(errp, "Node '%s' does not have child '%s'", 3480 parent, child); 3481 goto out; 3482 } 3483 bdrv_del_child(parent_bs, p_child, errp); 3484 } 3485 3486 if (node) { 3487 new_bs = bdrv_find_node(node); 3488 if (!new_bs) { 3489 error_setg(errp, "Node '%s' not found", node); 3490 goto out; 3491 } 3492 bdrv_add_child(parent_bs, new_bs, errp); 3493 } 3494 3495 out: 3496 bdrv_graph_wrunlock(); 3497 } 3498 3499 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3500 { 3501 BlockJobInfoList *head = NULL, **tail = &head; 3502 BlockJob *job; 3503 3504 JOB_LOCK_GUARD(); 3505 3506 for (job = block_job_next_locked(NULL); job; 3507 job = block_job_next_locked(job)) { 3508 BlockJobInfo *value; 3509 3510 if (block_job_is_internal(job)) { 3511 continue; 3512 } 3513 value = block_job_query_locked(job, errp); 3514 if (!value) { 3515 qapi_free_BlockJobInfoList(head); 3516 return NULL; 3517 } 3518 QAPI_LIST_APPEND(tail, value); 3519 } 3520 3521 return head; 3522 } 3523 3524 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 3525 bool has_force, bool force, Error **errp) 3526 { 3527 AioContext *new_context; 3528 BlockDriverState *bs; 3529 3530 GRAPH_RDLOCK_GUARD_MAINLOOP(); 3531 3532 bs = bdrv_find_node(node_name); 3533 if (!bs) { 3534 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3535 return; 3536 } 3537 3538 /* Protects against accidents. */ 3539 if (!(has_force && force) && bdrv_has_blk(bs)) { 3540 error_setg(errp, "Node %s is associated with a BlockBackend and could " 3541 "be in use (use force=true to override this check)", 3542 node_name); 3543 return; 3544 } 3545 3546 if (iothread->type == QTYPE_QSTRING) { 3547 IOThread *obj = iothread_by_id(iothread->u.s); 3548 if (!obj) { 3549 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 3550 return; 3551 } 3552 3553 new_context = iothread_get_aio_context(obj); 3554 } else { 3555 new_context = qemu_get_aio_context(); 3556 } 3557 3558 bdrv_try_change_aio_context(bs, new_context, NULL, errp); 3559 } 3560 3561 QemuOptsList qemu_common_drive_opts = { 3562 .name = "drive", 3563 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3564 .desc = { 3565 { 3566 .name = "snapshot", 3567 .type = QEMU_OPT_BOOL, 3568 .help = "enable/disable snapshot mode", 3569 },{ 3570 .name = "aio", 3571 .type = QEMU_OPT_STRING, 3572 .help = "host AIO implementation (threads, native, io_uring)", 3573 },{ 3574 .name = BDRV_OPT_CACHE_WB, 3575 .type = QEMU_OPT_BOOL, 3576 .help = "Enable writeback mode", 3577 },{ 3578 .name = "format", 3579 .type = QEMU_OPT_STRING, 3580 .help = "disk format (raw, qcow2, ...)", 3581 },{ 3582 .name = "rerror", 3583 .type = QEMU_OPT_STRING, 3584 .help = "read error action", 3585 },{ 3586 .name = "werror", 3587 .type = QEMU_OPT_STRING, 3588 .help = "write error action", 3589 },{ 3590 .name = BDRV_OPT_READ_ONLY, 3591 .type = QEMU_OPT_BOOL, 3592 .help = "open drive file as read-only", 3593 }, 3594 3595 THROTTLE_OPTS, 3596 3597 { 3598 .name = "throttling.group", 3599 .type = QEMU_OPT_STRING, 3600 .help = "name of the block throttling group", 3601 },{ 3602 .name = "copy-on-read", 3603 .type = QEMU_OPT_BOOL, 3604 .help = "copy read data from backing file into image file", 3605 },{ 3606 .name = "detect-zeroes", 3607 .type = QEMU_OPT_STRING, 3608 .help = "try to optimize zero writes (off, on, unmap)", 3609 },{ 3610 .name = "stats-account-invalid", 3611 .type = QEMU_OPT_BOOL, 3612 .help = "whether to account for invalid I/O operations " 3613 "in the statistics", 3614 },{ 3615 .name = "stats-account-failed", 3616 .type = QEMU_OPT_BOOL, 3617 .help = "whether to account for failed I/O operations " 3618 "in the statistics", 3619 }, 3620 { /* end of list */ } 3621 }, 3622 }; 3623 3624 QemuOptsList qemu_drive_opts = { 3625 .name = "drive", 3626 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3627 .desc = { 3628 /* 3629 * no elements => accept any params 3630 * validation will happen later 3631 */ 3632 { /* end of list */ } 3633 }, 3634 }; 3635