1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "qemu/osdep.h" 34 #include "sysemu/block-backend.h" 35 #include "sysemu/blockdev.h" 36 #include "hw/block/block.h" 37 #include "block/blockjob.h" 38 #include "block/dirty-bitmap.h" 39 #include "block/qdict.h" 40 #include "block/throttle-groups.h" 41 #include "monitor/monitor.h" 42 #include "qemu/error-report.h" 43 #include "qemu/option.h" 44 #include "qemu/qemu-print.h" 45 #include "qemu/config-file.h" 46 #include "qapi/qapi-commands-block.h" 47 #include "qapi/qapi-commands-transaction.h" 48 #include "qapi/qapi-visit-block-core.h" 49 #include "qapi/qmp/qdict.h" 50 #include "qapi/qmp/qnum.h" 51 #include "qapi/qmp/qstring.h" 52 #include "qapi/error.h" 53 #include "qapi/qmp/qerror.h" 54 #include "qapi/qmp/qlist.h" 55 #include "qapi/qobject-output-visitor.h" 56 #include "sysemu/sysemu.h" 57 #include "sysemu/iothread.h" 58 #include "block/block_int.h" 59 #include "block/trace.h" 60 #include "sysemu/runstate.h" 61 #include "sysemu/replay.h" 62 #include "qemu/cutils.h" 63 #include "qemu/help_option.h" 64 #include "qemu/main-loop.h" 65 #include "qemu/throttle-options.h" 66 67 /* Protected by BQL */ 68 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 69 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 70 71 void bdrv_set_monitor_owned(BlockDriverState *bs) 72 { 73 GLOBAL_STATE_CODE(); 74 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 75 } 76 77 static const char *const if_name[IF_COUNT] = { 78 [IF_NONE] = "none", 79 [IF_IDE] = "ide", 80 [IF_SCSI] = "scsi", 81 [IF_FLOPPY] = "floppy", 82 [IF_PFLASH] = "pflash", 83 [IF_MTD] = "mtd", 84 [IF_SD] = "sd", 85 [IF_VIRTIO] = "virtio", 86 [IF_XEN] = "xen", 87 }; 88 89 static int if_max_devs[IF_COUNT] = { 90 /* 91 * Do not change these numbers! They govern how drive option 92 * index maps to unit and bus. That mapping is ABI. 93 * 94 * All controllers used to implement if=T drives need to support 95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 96 * Otherwise, some index values map to "impossible" bus, unit 97 * values. 98 * 99 * For instance, if you change [IF_SCSI] to 255, -drive 100 * if=scsi,index=12 no longer means bus=1,unit=5, but 101 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 102 * the drive can't be set up. Regression. 103 */ 104 [IF_IDE] = 2, 105 [IF_SCSI] = 7, 106 }; 107 108 /** 109 * Boards may call this to offer board-by-board overrides 110 * of the default, global values. 111 */ 112 void override_max_devs(BlockInterfaceType type, int max_devs) 113 { 114 BlockBackend *blk; 115 DriveInfo *dinfo; 116 117 GLOBAL_STATE_CODE(); 118 119 if (max_devs <= 0) { 120 return; 121 } 122 123 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 124 dinfo = blk_legacy_dinfo(blk); 125 if (dinfo->type == type) { 126 fprintf(stderr, "Cannot override units-per-bus property of" 127 " the %s interface, because a drive of that type has" 128 " already been added.\n", if_name[type]); 129 g_assert_not_reached(); 130 } 131 } 132 133 if_max_devs[type] = max_devs; 134 } 135 136 /* 137 * We automatically delete the drive when a device using it gets 138 * unplugged. Questionable feature, but we can't just drop it. 139 * Device models call blockdev_mark_auto_del() to schedule the 140 * automatic deletion, and generic qdev code calls blockdev_auto_del() 141 * when deletion is actually safe. 142 */ 143 void blockdev_mark_auto_del(BlockBackend *blk) 144 { 145 DriveInfo *dinfo = blk_legacy_dinfo(blk); 146 BlockJob *job; 147 148 GLOBAL_STATE_CODE(); 149 150 if (!dinfo) { 151 return; 152 } 153 154 JOB_LOCK_GUARD(); 155 156 do { 157 job = block_job_next_locked(NULL); 158 while (job && (job->job.cancelled || 159 job->job.deferred_to_main_loop || 160 !block_job_has_bdrv(job, blk_bs(blk)))) 161 { 162 job = block_job_next_locked(job); 163 } 164 if (job) { 165 /* 166 * This drops the job lock temporarily and polls, so we need to 167 * restart processing the list from the start after this. 168 */ 169 job_cancel_locked(&job->job, false); 170 } 171 } while (job); 172 173 dinfo->auto_del = 1; 174 } 175 176 void blockdev_auto_del(BlockBackend *blk) 177 { 178 DriveInfo *dinfo = blk_legacy_dinfo(blk); 179 GLOBAL_STATE_CODE(); 180 181 if (dinfo && dinfo->auto_del) { 182 monitor_remove_blk(blk); 183 blk_unref(blk); 184 } 185 } 186 187 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 188 { 189 int max_devs = if_max_devs[type]; 190 return max_devs ? index / max_devs : 0; 191 } 192 193 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 194 { 195 int max_devs = if_max_devs[type]; 196 return max_devs ? index % max_devs : index; 197 } 198 199 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 200 const char *optstr) 201 { 202 QemuOpts *opts; 203 204 GLOBAL_STATE_CODE(); 205 206 opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 207 if (!opts) { 208 return NULL; 209 } 210 if (type != IF_DEFAULT) { 211 qemu_opt_set(opts, "if", if_name[type], &error_abort); 212 } 213 if (index >= 0) { 214 qemu_opt_set_number(opts, "index", index, &error_abort); 215 } 216 if (file) 217 qemu_opt_set(opts, "file", file, &error_abort); 218 return opts; 219 } 220 221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 222 { 223 BlockBackend *blk; 224 DriveInfo *dinfo; 225 226 GLOBAL_STATE_CODE(); 227 228 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 229 dinfo = blk_legacy_dinfo(blk); 230 if (dinfo && dinfo->type == type 231 && dinfo->bus == bus && dinfo->unit == unit) { 232 return dinfo; 233 } 234 } 235 236 return NULL; 237 } 238 239 /* 240 * Check board claimed all -drive that are meant to be claimed. 241 * Fatal error if any remain unclaimed. 242 */ 243 void drive_check_orphaned(void) 244 { 245 BlockBackend *blk; 246 DriveInfo *dinfo; 247 Location loc; 248 bool orphans = false; 249 250 GLOBAL_STATE_CODE(); 251 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 /* 255 * Ignore default drives, because we create certain default 256 * drives unconditionally, then leave them unclaimed. Not the 257 * users fault. 258 * Ignore IF_VIRTIO, because it gets desugared into -device, 259 * so we can leave failing to -device. 260 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains 261 * available for device_add is a feature. 262 */ 263 if (dinfo->is_default || dinfo->type == IF_VIRTIO 264 || dinfo->type == IF_NONE) { 265 continue; 266 } 267 if (!blk_get_attached_dev(blk)) { 268 loc_push_none(&loc); 269 qemu_opts_loc_restore(dinfo->opts); 270 error_report("machine type does not support" 271 " if=%s,bus=%d,unit=%d", 272 if_name[dinfo->type], dinfo->bus, dinfo->unit); 273 loc_pop(&loc); 274 orphans = true; 275 } 276 } 277 278 if (orphans) { 279 exit(1); 280 } 281 } 282 283 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 284 { 285 GLOBAL_STATE_CODE(); 286 return drive_get(type, 287 drive_index_to_bus_id(type, index), 288 drive_index_to_unit_id(type, index)); 289 } 290 291 int drive_get_max_bus(BlockInterfaceType type) 292 { 293 int max_bus; 294 BlockBackend *blk; 295 DriveInfo *dinfo; 296 297 GLOBAL_STATE_CODE(); 298 299 max_bus = -1; 300 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 301 dinfo = blk_legacy_dinfo(blk); 302 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 303 max_bus = dinfo->bus; 304 } 305 } 306 return max_bus; 307 } 308 309 static void bdrv_format_print(void *opaque, const char *name) 310 { 311 qemu_printf(" %s", name); 312 } 313 314 typedef struct { 315 QEMUBH *bh; 316 BlockDriverState *bs; 317 } BDRVPutRefBH; 318 319 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 320 { 321 if (!strcmp(buf, "ignore")) { 322 return BLOCKDEV_ON_ERROR_IGNORE; 323 } else if (!is_read && !strcmp(buf, "enospc")) { 324 return BLOCKDEV_ON_ERROR_ENOSPC; 325 } else if (!strcmp(buf, "stop")) { 326 return BLOCKDEV_ON_ERROR_STOP; 327 } else if (!strcmp(buf, "report")) { 328 return BLOCKDEV_ON_ERROR_REPORT; 329 } else { 330 error_setg(errp, "'%s' invalid %s error action", 331 buf, is_read ? "read" : "write"); 332 return -1; 333 } 334 } 335 336 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 337 Error **errp) 338 { 339 const QListEntry *entry; 340 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 341 switch (qobject_type(entry->value)) { 342 343 case QTYPE_QSTRING: { 344 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 BlockDriverState *bs; 666 int bdrv_flags = 0; 667 668 GLOBAL_STATE_CODE(); 669 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 670 * with other callers) rather than what we want as the real defaults. 671 * Apply the defaults here instead. */ 672 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 673 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 674 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 675 676 if (runstate_check(RUN_STATE_INMIGRATE)) { 677 bdrv_flags |= BDRV_O_INACTIVE; 678 } 679 680 aio_context_acquire(qemu_get_aio_context()); 681 bs = bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 682 aio_context_release(qemu_get_aio_context()); 683 684 return bs; 685 } 686 687 void blockdev_close_all_bdrv_states(void) 688 { 689 BlockDriverState *bs, *next_bs; 690 691 GLOBAL_STATE_CODE(); 692 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 693 AioContext *ctx = bdrv_get_aio_context(bs); 694 695 aio_context_acquire(ctx); 696 bdrv_unref(bs); 697 aio_context_release(ctx); 698 } 699 } 700 701 /* Iterates over the list of monitor-owned BlockDriverStates */ 702 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 703 { 704 GLOBAL_STATE_CODE(); 705 return bs ? QTAILQ_NEXT(bs, monitor_list) 706 : QTAILQ_FIRST(&monitor_bdrv_states); 707 } 708 709 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 710 Error **errp) 711 { 712 const char *value; 713 714 value = qemu_opt_get(opts, from); 715 if (value) { 716 if (qemu_opt_find(opts, to)) { 717 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 718 "same time", to, from); 719 return false; 720 } 721 } 722 723 /* rename all items in opts */ 724 while ((value = qemu_opt_get(opts, from))) { 725 qemu_opt_set(opts, to, value, &error_abort); 726 qemu_opt_unset(opts, from); 727 } 728 return true; 729 } 730 731 QemuOptsList qemu_legacy_drive_opts = { 732 .name = "drive", 733 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 734 .desc = { 735 { 736 .name = "bus", 737 .type = QEMU_OPT_NUMBER, 738 .help = "bus number", 739 },{ 740 .name = "unit", 741 .type = QEMU_OPT_NUMBER, 742 .help = "unit number (i.e. lun for scsi)", 743 },{ 744 .name = "index", 745 .type = QEMU_OPT_NUMBER, 746 .help = "index number", 747 },{ 748 .name = "media", 749 .type = QEMU_OPT_STRING, 750 .help = "media type (disk, cdrom)", 751 },{ 752 .name = "if", 753 .type = QEMU_OPT_STRING, 754 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 755 },{ 756 .name = "file", 757 .type = QEMU_OPT_STRING, 758 .help = "file name", 759 }, 760 761 /* Options that are passed on, but have special semantics with -drive */ 762 { 763 .name = BDRV_OPT_READ_ONLY, 764 .type = QEMU_OPT_BOOL, 765 .help = "open drive file as read-only", 766 },{ 767 .name = "rerror", 768 .type = QEMU_OPT_STRING, 769 .help = "read error action", 770 },{ 771 .name = "werror", 772 .type = QEMU_OPT_STRING, 773 .help = "write error action", 774 },{ 775 .name = "copy-on-read", 776 .type = QEMU_OPT_BOOL, 777 .help = "copy read data from backing file into image file", 778 }, 779 780 { /* end of list */ } 781 }, 782 }; 783 784 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 785 Error **errp) 786 { 787 const char *value; 788 BlockBackend *blk; 789 DriveInfo *dinfo = NULL; 790 QDict *bs_opts; 791 QemuOpts *legacy_opts; 792 DriveMediaType media = MEDIA_DISK; 793 BlockInterfaceType type; 794 int max_devs, bus_id, unit_id, index; 795 const char *werror, *rerror; 796 bool read_only = false; 797 bool copy_on_read; 798 const char *filename; 799 int i; 800 801 GLOBAL_STATE_CODE(); 802 803 /* Change legacy command line options into QMP ones */ 804 static const struct { 805 const char *from; 806 const char *to; 807 } opt_renames[] = { 808 { "iops", "throttling.iops-total" }, 809 { "iops_rd", "throttling.iops-read" }, 810 { "iops_wr", "throttling.iops-write" }, 811 812 { "bps", "throttling.bps-total" }, 813 { "bps_rd", "throttling.bps-read" }, 814 { "bps_wr", "throttling.bps-write" }, 815 816 { "iops_max", "throttling.iops-total-max" }, 817 { "iops_rd_max", "throttling.iops-read-max" }, 818 { "iops_wr_max", "throttling.iops-write-max" }, 819 820 { "bps_max", "throttling.bps-total-max" }, 821 { "bps_rd_max", "throttling.bps-read-max" }, 822 { "bps_wr_max", "throttling.bps-write-max" }, 823 824 { "iops_size", "throttling.iops-size" }, 825 826 { "group", "throttling.group" }, 827 828 { "readonly", BDRV_OPT_READ_ONLY }, 829 }; 830 831 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 832 if (!qemu_opt_rename(all_opts, opt_renames[i].from, 833 opt_renames[i].to, errp)) { 834 return NULL; 835 } 836 } 837 838 value = qemu_opt_get(all_opts, "cache"); 839 if (value) { 840 int flags = 0; 841 bool writethrough; 842 843 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 844 error_setg(errp, "invalid cache option"); 845 return NULL; 846 } 847 848 /* Specific options take precedence */ 849 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 850 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 851 !writethrough, &error_abort); 852 } 853 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 854 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 855 !!(flags & BDRV_O_NOCACHE), &error_abort); 856 } 857 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 858 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 859 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 860 } 861 qemu_opt_unset(all_opts, "cache"); 862 } 863 864 /* Get a QDict for processing the options */ 865 bs_opts = qdict_new(); 866 qemu_opts_to_qdict(all_opts, bs_opts); 867 868 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 869 &error_abort); 870 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) { 871 goto fail; 872 } 873 874 /* Media type */ 875 value = qemu_opt_get(legacy_opts, "media"); 876 if (value) { 877 if (!strcmp(value, "disk")) { 878 media = MEDIA_DISK; 879 } else if (!strcmp(value, "cdrom")) { 880 media = MEDIA_CDROM; 881 read_only = true; 882 } else { 883 error_setg(errp, "'%s' invalid media", value); 884 goto fail; 885 } 886 } 887 888 /* copy-on-read is disabled with a warning for read-only devices */ 889 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 890 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 891 892 if (read_only && copy_on_read) { 893 warn_report("disabling copy-on-read on read-only drive"); 894 copy_on_read = false; 895 } 896 897 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 898 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 899 900 /* Controller type */ 901 value = qemu_opt_get(legacy_opts, "if"); 902 if (value) { 903 for (type = 0; 904 type < IF_COUNT && strcmp(value, if_name[type]); 905 type++) { 906 } 907 if (type == IF_COUNT) { 908 error_setg(errp, "unsupported bus type '%s'", value); 909 goto fail; 910 } 911 } else { 912 type = block_default_type; 913 } 914 915 /* Device address specified by bus/unit or index. 916 * If none was specified, try to find the first free one. */ 917 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 918 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 919 index = qemu_opt_get_number(legacy_opts, "index", -1); 920 921 max_devs = if_max_devs[type]; 922 923 if (index != -1) { 924 if (bus_id != 0 || unit_id != -1) { 925 error_setg(errp, "index cannot be used with bus and unit"); 926 goto fail; 927 } 928 bus_id = drive_index_to_bus_id(type, index); 929 unit_id = drive_index_to_unit_id(type, index); 930 } 931 932 if (unit_id == -1) { 933 unit_id = 0; 934 while (drive_get(type, bus_id, unit_id) != NULL) { 935 unit_id++; 936 if (max_devs && unit_id >= max_devs) { 937 unit_id -= max_devs; 938 bus_id++; 939 } 940 } 941 } 942 943 if (max_devs && unit_id >= max_devs) { 944 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 945 goto fail; 946 } 947 948 if (drive_get(type, bus_id, unit_id) != NULL) { 949 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 950 bus_id, unit_id, index); 951 goto fail; 952 } 953 954 /* no id supplied -> create one */ 955 if (qemu_opts_id(all_opts) == NULL) { 956 char *new_id; 957 const char *mediastr = ""; 958 if (type == IF_IDE || type == IF_SCSI) { 959 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 960 } 961 if (max_devs) { 962 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 963 mediastr, unit_id); 964 } else { 965 new_id = g_strdup_printf("%s%s%i", if_name[type], 966 mediastr, unit_id); 967 } 968 qdict_put_str(bs_opts, "id", new_id); 969 g_free(new_id); 970 } 971 972 /* Add virtio block device */ 973 if (type == IF_VIRTIO) { 974 QemuOpts *devopts; 975 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 976 &error_abort); 977 qemu_opt_set(devopts, "driver", "virtio-blk", &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 AioContext *aio_context; 1043 1044 bs = bdrv_lookup_bs(name, name, errp); 1045 if (bs == NULL) { 1046 return NULL; 1047 } 1048 1049 if (!bdrv_is_root_node(bs)) { 1050 error_setg(errp, "Need a root block node"); 1051 return NULL; 1052 } 1053 1054 aio_context = bdrv_get_aio_context(bs); 1055 aio_context_acquire(aio_context); 1056 1057 if (!bdrv_is_inserted(bs)) { 1058 error_setg(errp, "Device has no medium"); 1059 bs = NULL; 1060 } 1061 1062 aio_context_release(aio_context); 1063 1064 return bs; 1065 } 1066 1067 static void blockdev_do_action(TransactionAction *action, Error **errp) 1068 { 1069 TransactionActionList list; 1070 1071 list.value = action; 1072 list.next = NULL; 1073 qmp_transaction(&list, NULL, errp); 1074 } 1075 1076 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name, 1077 const char *snapshot_file, 1078 const char *snapshot_node_name, 1079 const char *format, 1080 bool has_mode, NewImageMode mode, Error **errp) 1081 { 1082 BlockdevSnapshotSync snapshot = { 1083 .device = (char *) device, 1084 .node_name = (char *) node_name, 1085 .snapshot_file = (char *) snapshot_file, 1086 .snapshot_node_name = (char *) snapshot_node_name, 1087 .format = (char *) format, 1088 .has_mode = has_mode, 1089 .mode = mode, 1090 }; 1091 TransactionAction action = { 1092 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1093 .u.blockdev_snapshot_sync.data = &snapshot, 1094 }; 1095 blockdev_do_action(&action, errp); 1096 } 1097 1098 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1099 Error **errp) 1100 { 1101 BlockdevSnapshot snapshot_data = { 1102 .node = (char *) node, 1103 .overlay = (char *) overlay 1104 }; 1105 TransactionAction action = { 1106 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1107 .u.blockdev_snapshot.data = &snapshot_data, 1108 }; 1109 blockdev_do_action(&action, errp); 1110 } 1111 1112 void qmp_blockdev_snapshot_internal_sync(const char *device, 1113 const char *name, 1114 Error **errp) 1115 { 1116 BlockdevSnapshotInternal snapshot = { 1117 .device = (char *) device, 1118 .name = (char *) name 1119 }; 1120 TransactionAction action = { 1121 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1122 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1123 }; 1124 blockdev_do_action(&action, errp); 1125 } 1126 1127 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1128 const char *id, 1129 const char *name, 1130 Error **errp) 1131 { 1132 BlockDriverState *bs; 1133 AioContext *aio_context; 1134 QEMUSnapshotInfo sn; 1135 Error *local_err = NULL; 1136 SnapshotInfo *info = NULL; 1137 int ret; 1138 1139 bs = qmp_get_root_bs(device, errp); 1140 if (!bs) { 1141 return NULL; 1142 } 1143 aio_context = bdrv_get_aio_context(bs); 1144 aio_context_acquire(aio_context); 1145 1146 if (!id && !name) { 1147 error_setg(errp, "Name or id must be provided"); 1148 goto out_aio_context; 1149 } 1150 1151 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1152 goto out_aio_context; 1153 } 1154 1155 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1156 if (local_err) { 1157 error_propagate(errp, local_err); 1158 goto out_aio_context; 1159 } 1160 if (!ret) { 1161 error_setg(errp, 1162 "Snapshot with id '%s' and name '%s' does not exist on " 1163 "device '%s'", 1164 STR_OR_NULL(id), STR_OR_NULL(name), device); 1165 goto out_aio_context; 1166 } 1167 1168 bdrv_snapshot_delete(bs, id, name, &local_err); 1169 if (local_err) { 1170 error_propagate(errp, local_err); 1171 goto out_aio_context; 1172 } 1173 1174 aio_context_release(aio_context); 1175 1176 info = g_new0(SnapshotInfo, 1); 1177 info->id = g_strdup(sn.id_str); 1178 info->name = g_strdup(sn.name); 1179 info->date_nsec = sn.date_nsec; 1180 info->date_sec = sn.date_sec; 1181 info->vm_state_size = sn.vm_state_size; 1182 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1183 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1184 if (sn.icount != -1ULL) { 1185 info->icount = sn.icount; 1186 info->has_icount = true; 1187 } 1188 1189 return info; 1190 1191 out_aio_context: 1192 aio_context_release(aio_context); 1193 return NULL; 1194 } 1195 1196 /* internal snapshot private data */ 1197 typedef struct InternalSnapshotState { 1198 BlockDriverState *bs; 1199 QEMUSnapshotInfo sn; 1200 bool created; 1201 } InternalSnapshotState; 1202 1203 static void internal_snapshot_abort(void *opaque); 1204 static void internal_snapshot_clean(void *opaque); 1205 TransactionActionDrv internal_snapshot_drv = { 1206 .abort = internal_snapshot_abort, 1207 .clean = internal_snapshot_clean, 1208 }; 1209 1210 static void internal_snapshot_action(BlockdevSnapshotInternal *internal, 1211 Transaction *tran, Error **errp) 1212 { 1213 Error *local_err = NULL; 1214 const char *device; 1215 const char *name; 1216 BlockDriverState *bs; 1217 QEMUSnapshotInfo old_sn, *sn; 1218 bool ret; 1219 int64_t rt; 1220 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1); 1221 AioContext *aio_context; 1222 int ret1; 1223 1224 tran_add(tran, &internal_snapshot_drv, state); 1225 1226 device = internal->device; 1227 name = internal->name; 1228 1229 bs = qmp_get_root_bs(device, errp); 1230 if (!bs) { 1231 return; 1232 } 1233 1234 aio_context = bdrv_get_aio_context(bs); 1235 aio_context_acquire(aio_context); 1236 1237 state->bs = bs; 1238 1239 /* Paired with .clean() */ 1240 bdrv_drained_begin(bs); 1241 1242 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1243 goto out; 1244 } 1245 1246 if (bdrv_is_read_only(bs)) { 1247 error_setg(errp, "Device '%s' is read only", device); 1248 goto out; 1249 } 1250 1251 if (!bdrv_can_snapshot(bs)) { 1252 error_setg(errp, "Block format '%s' used by device '%s' " 1253 "does not support internal snapshots", 1254 bs->drv->format_name, device); 1255 goto out; 1256 } 1257 1258 if (!strlen(name)) { 1259 error_setg(errp, "Name is empty"); 1260 goto out; 1261 } 1262 1263 /* check whether a snapshot with name exist */ 1264 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1265 &local_err); 1266 if (local_err) { 1267 error_propagate(errp, local_err); 1268 goto out; 1269 } else if (ret) { 1270 error_setg(errp, 1271 "Snapshot with name '%s' already exists on device '%s'", 1272 name, device); 1273 goto out; 1274 } 1275 1276 /* 3. take the snapshot */ 1277 sn = &state->sn; 1278 pstrcpy(sn->name, sizeof(sn->name), name); 1279 rt = g_get_real_time(); 1280 sn->date_sec = rt / G_USEC_PER_SEC; 1281 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000; 1282 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1283 if (replay_mode != REPLAY_MODE_NONE) { 1284 sn->icount = replay_get_current_icount(); 1285 } else { 1286 sn->icount = -1ULL; 1287 } 1288 1289 ret1 = bdrv_snapshot_create(bs, sn); 1290 if (ret1 < 0) { 1291 error_setg_errno(errp, -ret1, 1292 "Failed to create snapshot '%s' on device '%s'", 1293 name, device); 1294 goto out; 1295 } 1296 1297 /* 4. succeed, mark a snapshot is created */ 1298 state->created = true; 1299 1300 out: 1301 aio_context_release(aio_context); 1302 } 1303 1304 static void internal_snapshot_abort(void *opaque) 1305 { 1306 InternalSnapshotState *state = opaque; 1307 BlockDriverState *bs = state->bs; 1308 QEMUSnapshotInfo *sn = &state->sn; 1309 AioContext *aio_context; 1310 Error *local_error = NULL; 1311 1312 if (!state->created) { 1313 return; 1314 } 1315 1316 aio_context = bdrv_get_aio_context(state->bs); 1317 aio_context_acquire(aio_context); 1318 1319 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1320 error_reportf_err(local_error, 1321 "Failed to delete snapshot with id '%s' and " 1322 "name '%s' on device '%s' in abort: ", 1323 sn->id_str, sn->name, 1324 bdrv_get_device_name(bs)); 1325 } 1326 1327 aio_context_release(aio_context); 1328 } 1329 1330 static void internal_snapshot_clean(void *opaque) 1331 { 1332 g_autofree InternalSnapshotState *state = opaque; 1333 AioContext *aio_context; 1334 1335 if (!state->bs) { 1336 return; 1337 } 1338 1339 aio_context = bdrv_get_aio_context(state->bs); 1340 aio_context_acquire(aio_context); 1341 1342 bdrv_drained_end(state->bs); 1343 1344 aio_context_release(aio_context); 1345 } 1346 1347 /* external snapshot private data */ 1348 typedef struct ExternalSnapshotState { 1349 BlockDriverState *old_bs; 1350 BlockDriverState *new_bs; 1351 bool overlay_appended; 1352 } ExternalSnapshotState; 1353 1354 static void external_snapshot_commit(void *opaque); 1355 static void external_snapshot_abort(void *opaque); 1356 static void external_snapshot_clean(void *opaque); 1357 TransactionActionDrv external_snapshot_drv = { 1358 .commit = external_snapshot_commit, 1359 .abort = external_snapshot_abort, 1360 .clean = external_snapshot_clean, 1361 }; 1362 1363 static void external_snapshot_action(TransactionAction *action, 1364 Transaction *tran, Error **errp) 1365 { 1366 int ret; 1367 int flags = 0; 1368 QDict *options = NULL; 1369 Error *local_err = NULL; 1370 /* Device and node name of the image to generate the snapshot from */ 1371 const char *device; 1372 const char *node_name; 1373 /* Reference to the new image (for 'blockdev-snapshot') */ 1374 const char *snapshot_ref; 1375 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1376 const char *new_image_file; 1377 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1); 1378 AioContext *aio_context; 1379 uint64_t perm, shared; 1380 1381 /* TODO We'll eventually have to take a writer lock in this function */ 1382 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1383 1384 tran_add(tran, &external_snapshot_drv, state); 1385 1386 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1387 * purpose but a different set of parameters */ 1388 switch (action->type) { 1389 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1390 { 1391 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1392 device = s->node; 1393 node_name = s->node; 1394 new_image_file = NULL; 1395 snapshot_ref = s->overlay; 1396 } 1397 break; 1398 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1399 { 1400 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1401 device = s->device; 1402 node_name = s->node_name; 1403 new_image_file = s->snapshot_file; 1404 snapshot_ref = NULL; 1405 } 1406 break; 1407 default: 1408 g_assert_not_reached(); 1409 } 1410 1411 /* start processing */ 1412 1413 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1414 if (!state->old_bs) { 1415 return; 1416 } 1417 1418 aio_context = bdrv_get_aio_context(state->old_bs); 1419 aio_context_acquire(aio_context); 1420 1421 /* Paired with .clean() */ 1422 bdrv_drained_begin(state->old_bs); 1423 1424 if (!bdrv_is_inserted(state->old_bs)) { 1425 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1426 goto out; 1427 } 1428 1429 if (bdrv_op_is_blocked(state->old_bs, 1430 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1431 goto out; 1432 } 1433 1434 if (!bdrv_is_read_only(state->old_bs)) { 1435 if (bdrv_flush(state->old_bs)) { 1436 error_setg(errp, QERR_IO_ERROR); 1437 goto out; 1438 } 1439 } 1440 1441 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1442 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1443 const char *format = s->format ?: "qcow2"; 1444 enum NewImageMode mode; 1445 const char *snapshot_node_name = s->snapshot_node_name; 1446 1447 if (node_name && !snapshot_node_name) { 1448 error_setg(errp, "New overlay node-name missing"); 1449 goto out; 1450 } 1451 1452 if (snapshot_node_name && 1453 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1454 error_setg(errp, "New overlay node-name already in use"); 1455 goto out; 1456 } 1457 1458 flags = state->old_bs->open_flags; 1459 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1460 flags |= BDRV_O_NO_BACKING; 1461 1462 /* create new image w/backing file */ 1463 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1464 if (mode != NEW_IMAGE_MODE_EXISTING) { 1465 int64_t size = bdrv_getlength(state->old_bs); 1466 if (size < 0) { 1467 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1468 goto out; 1469 } 1470 bdrv_refresh_filename(state->old_bs); 1471 1472 aio_context_release(aio_context); 1473 bdrv_img_create(new_image_file, format, 1474 state->old_bs->filename, 1475 state->old_bs->drv->format_name, 1476 NULL, size, flags, false, &local_err); 1477 aio_context_acquire(aio_context); 1478 1479 if (local_err) { 1480 error_propagate(errp, local_err); 1481 goto out; 1482 } 1483 } 1484 1485 options = qdict_new(); 1486 if (snapshot_node_name) { 1487 qdict_put_str(options, "node-name", snapshot_node_name); 1488 } 1489 qdict_put_str(options, "driver", format); 1490 } 1491 aio_context_release(aio_context); 1492 1493 aio_context_acquire(qemu_get_aio_context()); 1494 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1495 errp); 1496 aio_context_release(qemu_get_aio_context()); 1497 1498 /* We will manually add the backing_hd field to the bs later */ 1499 if (!state->new_bs) { 1500 return; 1501 } 1502 1503 aio_context_acquire(aio_context); 1504 1505 /* 1506 * Allow attaching a backing file to an overlay that's already in use only 1507 * if the parents don't assume that they are already seeing a valid image. 1508 * (Specifically, allow it as a mirror target, which is write-only access.) 1509 */ 1510 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); 1511 if (perm & BLK_PERM_CONSISTENT_READ) { 1512 error_setg(errp, "The overlay is already in use"); 1513 goto out; 1514 } 1515 1516 if (state->new_bs->drv->is_filter) { 1517 error_setg(errp, "Filters cannot be used as overlays"); 1518 goto out; 1519 } 1520 1521 if (bdrv_cow_child(state->new_bs)) { 1522 error_setg(errp, "The overlay already has a backing image"); 1523 goto out; 1524 } 1525 1526 if (!state->new_bs->drv->supports_backing) { 1527 error_setg(errp, "The overlay does not support backing images"); 1528 goto out; 1529 } 1530 1531 ret = bdrv_append(state->new_bs, state->old_bs, errp); 1532 if (ret < 0) { 1533 goto out; 1534 } 1535 state->overlay_appended = true; 1536 1537 out: 1538 aio_context_release(aio_context); 1539 } 1540 1541 static void external_snapshot_commit(void *opaque) 1542 { 1543 ExternalSnapshotState *state = opaque; 1544 AioContext *aio_context; 1545 1546 aio_context = bdrv_get_aio_context(state->old_bs); 1547 aio_context_acquire(aio_context); 1548 1549 /* We don't need (or want) to use the transactional 1550 * bdrv_reopen_multiple() across all the entries at once, because we 1551 * don't want to abort all of them if one of them fails the reopen */ 1552 if (!qatomic_read(&state->old_bs->copy_on_read)) { 1553 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1554 } 1555 1556 aio_context_release(aio_context); 1557 } 1558 1559 static void external_snapshot_abort(void *opaque) 1560 { 1561 ExternalSnapshotState *state = opaque; 1562 if (state->new_bs) { 1563 if (state->overlay_appended) { 1564 AioContext *aio_context; 1565 AioContext *tmp_context; 1566 int ret; 1567 1568 aio_context = bdrv_get_aio_context(state->old_bs); 1569 aio_context_acquire(aio_context); 1570 1571 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1572 close state->old_bs; we need it */ 1573 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1574 1575 /* 1576 * The call to bdrv_set_backing_hd() above returns state->old_bs to 1577 * the main AioContext. As we're still going to be using it, return 1578 * it to the AioContext it was before. 1579 */ 1580 tmp_context = bdrv_get_aio_context(state->old_bs); 1581 if (aio_context != tmp_context) { 1582 aio_context_release(aio_context); 1583 aio_context_acquire(tmp_context); 1584 1585 ret = bdrv_try_change_aio_context(state->old_bs, 1586 aio_context, NULL, NULL); 1587 assert(ret == 0); 1588 1589 aio_context_release(tmp_context); 1590 aio_context_acquire(aio_context); 1591 } 1592 1593 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1594 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1595 1596 aio_context_release(aio_context); 1597 } 1598 } 1599 } 1600 1601 static void external_snapshot_clean(void *opaque) 1602 { 1603 g_autofree ExternalSnapshotState *state = opaque; 1604 AioContext *aio_context; 1605 1606 if (!state->old_bs) { 1607 return; 1608 } 1609 1610 aio_context = bdrv_get_aio_context(state->old_bs); 1611 aio_context_acquire(aio_context); 1612 1613 bdrv_drained_end(state->old_bs); 1614 bdrv_unref(state->new_bs); 1615 1616 aio_context_release(aio_context); 1617 } 1618 1619 typedef struct DriveBackupState { 1620 BlockDriverState *bs; 1621 BlockJob *job; 1622 } DriveBackupState; 1623 1624 static BlockJob *do_backup_common(BackupCommon *backup, 1625 BlockDriverState *bs, 1626 BlockDriverState *target_bs, 1627 AioContext *aio_context, 1628 JobTxn *txn, Error **errp); 1629 1630 static void drive_backup_commit(void *opaque); 1631 static void drive_backup_abort(void *opaque); 1632 static void drive_backup_clean(void *opaque); 1633 TransactionActionDrv drive_backup_drv = { 1634 .commit = drive_backup_commit, 1635 .abort = drive_backup_abort, 1636 .clean = drive_backup_clean, 1637 }; 1638 1639 static void drive_backup_action(DriveBackup *backup, 1640 JobTxn *block_job_txn, 1641 Transaction *tran, Error **errp) 1642 { 1643 DriveBackupState *state = g_new0(DriveBackupState, 1); 1644 BlockDriverState *bs; 1645 BlockDriverState *target_bs; 1646 BlockDriverState *source = NULL; 1647 AioContext *aio_context; 1648 AioContext *old_context; 1649 const char *format; 1650 QDict *options; 1651 Error *local_err = NULL; 1652 int flags; 1653 int64_t size; 1654 bool set_backing_hd = false; 1655 int ret; 1656 1657 tran_add(tran, &drive_backup_drv, state); 1658 1659 if (!backup->has_mode) { 1660 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1661 } 1662 1663 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1664 if (!bs) { 1665 return; 1666 } 1667 1668 if (!bs->drv) { 1669 error_setg(errp, "Device has no medium"); 1670 return; 1671 } 1672 1673 aio_context = bdrv_get_aio_context(bs); 1674 aio_context_acquire(aio_context); 1675 1676 state->bs = bs; 1677 /* Paired with .clean() */ 1678 bdrv_drained_begin(bs); 1679 1680 format = backup->format; 1681 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) { 1682 format = bs->drv->format_name; 1683 } 1684 1685 /* Early check to avoid creating target */ 1686 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 1687 goto out; 1688 } 1689 1690 flags = bs->open_flags | BDRV_O_RDWR; 1691 1692 /* 1693 * See if we have a backing HD we can use to create our new image 1694 * on top of. 1695 */ 1696 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 1697 /* 1698 * Backup will not replace the source by the target, so none 1699 * of the filters skipped here will be removed (in contrast to 1700 * mirror). Therefore, we can skip all of them when looking 1701 * for the first COW relationship. 1702 */ 1703 source = bdrv_cow_bs(bdrv_skip_filters(bs)); 1704 if (!source) { 1705 backup->sync = MIRROR_SYNC_MODE_FULL; 1706 } 1707 } 1708 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 1709 source = bs; 1710 flags |= BDRV_O_NO_BACKING; 1711 set_backing_hd = true; 1712 } 1713 1714 size = bdrv_getlength(bs); 1715 if (size < 0) { 1716 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1717 goto out; 1718 } 1719 1720 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 1721 assert(format); 1722 if (source) { 1723 /* Implicit filters should not appear in the filename */ 1724 BlockDriverState *explicit_backing = 1725 bdrv_skip_implicit_filters(source); 1726 1727 bdrv_refresh_filename(explicit_backing); 1728 bdrv_img_create(backup->target, format, 1729 explicit_backing->filename, 1730 explicit_backing->drv->format_name, NULL, 1731 size, flags, false, &local_err); 1732 } else { 1733 bdrv_img_create(backup->target, format, NULL, NULL, NULL, 1734 size, flags, false, &local_err); 1735 } 1736 } 1737 1738 if (local_err) { 1739 error_propagate(errp, local_err); 1740 goto out; 1741 } 1742 1743 options = qdict_new(); 1744 qdict_put_str(options, "discard", "unmap"); 1745 qdict_put_str(options, "detect-zeroes", "unmap"); 1746 if (format) { 1747 qdict_put_str(options, "driver", format); 1748 } 1749 aio_context_release(aio_context); 1750 1751 aio_context_acquire(qemu_get_aio_context()); 1752 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 1753 aio_context_release(qemu_get_aio_context()); 1754 1755 if (!target_bs) { 1756 return; 1757 } 1758 1759 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1760 old_context = bdrv_get_aio_context(target_bs); 1761 aio_context_acquire(old_context); 1762 1763 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1764 if (ret < 0) { 1765 bdrv_unref(target_bs); 1766 aio_context_release(old_context); 1767 return; 1768 } 1769 1770 aio_context_release(old_context); 1771 aio_context_acquire(aio_context); 1772 1773 if (set_backing_hd) { 1774 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { 1775 goto unref; 1776 } 1777 } 1778 1779 state->job = do_backup_common(qapi_DriveBackup_base(backup), 1780 bs, target_bs, aio_context, 1781 block_job_txn, errp); 1782 1783 unref: 1784 bdrv_unref(target_bs); 1785 out: 1786 aio_context_release(aio_context); 1787 } 1788 1789 static void drive_backup_commit(void *opaque) 1790 { 1791 DriveBackupState *state = opaque; 1792 AioContext *aio_context; 1793 1794 aio_context = bdrv_get_aio_context(state->bs); 1795 aio_context_acquire(aio_context); 1796 1797 assert(state->job); 1798 job_start(&state->job->job); 1799 1800 aio_context_release(aio_context); 1801 } 1802 1803 static void drive_backup_abort(void *opaque) 1804 { 1805 DriveBackupState *state = opaque; 1806 1807 if (state->job) { 1808 job_cancel_sync(&state->job->job, true); 1809 } 1810 } 1811 1812 static void drive_backup_clean(void *opaque) 1813 { 1814 g_autofree DriveBackupState *state = opaque; 1815 AioContext *aio_context; 1816 1817 if (!state->bs) { 1818 return; 1819 } 1820 1821 aio_context = bdrv_get_aio_context(state->bs); 1822 aio_context_acquire(aio_context); 1823 1824 bdrv_drained_end(state->bs); 1825 1826 aio_context_release(aio_context); 1827 } 1828 1829 typedef struct BlockdevBackupState { 1830 BlockDriverState *bs; 1831 BlockJob *job; 1832 } BlockdevBackupState; 1833 1834 static void blockdev_backup_commit(void *opaque); 1835 static void blockdev_backup_abort(void *opaque); 1836 static void blockdev_backup_clean(void *opaque); 1837 TransactionActionDrv blockdev_backup_drv = { 1838 .commit = blockdev_backup_commit, 1839 .abort = blockdev_backup_abort, 1840 .clean = blockdev_backup_clean, 1841 }; 1842 1843 static void blockdev_backup_action(BlockdevBackup *backup, 1844 JobTxn *block_job_txn, 1845 Transaction *tran, Error **errp) 1846 { 1847 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1); 1848 BlockDriverState *bs; 1849 BlockDriverState *target_bs; 1850 AioContext *aio_context; 1851 AioContext *old_context; 1852 int ret; 1853 1854 tran_add(tran, &blockdev_backup_drv, state); 1855 1856 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1857 if (!bs) { 1858 return; 1859 } 1860 1861 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 1862 if (!target_bs) { 1863 return; 1864 } 1865 1866 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 1867 aio_context = bdrv_get_aio_context(bs); 1868 old_context = bdrv_get_aio_context(target_bs); 1869 aio_context_acquire(old_context); 1870 1871 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 1872 if (ret < 0) { 1873 aio_context_release(old_context); 1874 return; 1875 } 1876 1877 aio_context_release(old_context); 1878 aio_context_acquire(aio_context); 1879 state->bs = bs; 1880 1881 /* Paired with .clean() */ 1882 bdrv_drained_begin(state->bs); 1883 1884 state->job = do_backup_common(qapi_BlockdevBackup_base(backup), 1885 bs, target_bs, aio_context, 1886 block_job_txn, errp); 1887 1888 aio_context_release(aio_context); 1889 } 1890 1891 static void blockdev_backup_commit(void *opaque) 1892 { 1893 BlockdevBackupState *state = opaque; 1894 AioContext *aio_context; 1895 1896 aio_context = bdrv_get_aio_context(state->bs); 1897 aio_context_acquire(aio_context); 1898 1899 assert(state->job); 1900 job_start(&state->job->job); 1901 1902 aio_context_release(aio_context); 1903 } 1904 1905 static void blockdev_backup_abort(void *opaque) 1906 { 1907 BlockdevBackupState *state = opaque; 1908 1909 if (state->job) { 1910 job_cancel_sync(&state->job->job, true); 1911 } 1912 } 1913 1914 static void blockdev_backup_clean(void *opaque) 1915 { 1916 g_autofree BlockdevBackupState *state = opaque; 1917 AioContext *aio_context; 1918 1919 if (!state->bs) { 1920 return; 1921 } 1922 1923 aio_context = bdrv_get_aio_context(state->bs); 1924 aio_context_acquire(aio_context); 1925 1926 bdrv_drained_end(state->bs); 1927 1928 aio_context_release(aio_context); 1929 } 1930 1931 typedef struct BlockDirtyBitmapState { 1932 BdrvDirtyBitmap *bitmap; 1933 BlockDriverState *bs; 1934 HBitmap *backup; 1935 bool was_enabled; 1936 } BlockDirtyBitmapState; 1937 1938 static void block_dirty_bitmap_add_abort(void *opaque); 1939 TransactionActionDrv block_dirty_bitmap_add_drv = { 1940 .abort = block_dirty_bitmap_add_abort, 1941 .clean = g_free, 1942 }; 1943 1944 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action, 1945 Transaction *tran, Error **errp) 1946 { 1947 Error *local_err = NULL; 1948 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1949 1950 tran_add(tran, &block_dirty_bitmap_add_drv, state); 1951 1952 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1953 qmp_block_dirty_bitmap_add(action->node, action->name, 1954 action->has_granularity, action->granularity, 1955 action->has_persistent, action->persistent, 1956 action->has_disabled, action->disabled, 1957 &local_err); 1958 1959 if (!local_err) { 1960 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name, 1961 NULL, &error_abort); 1962 } else { 1963 error_propagate(errp, local_err); 1964 } 1965 } 1966 1967 static void block_dirty_bitmap_add_abort(void *opaque) 1968 { 1969 BlockDirtyBitmapState *state = opaque; 1970 1971 if (state->bitmap) { 1972 bdrv_release_dirty_bitmap(state->bitmap); 1973 } 1974 } 1975 1976 static void block_dirty_bitmap_restore(void *opaque); 1977 static void block_dirty_bitmap_free_backup(void *opaque); 1978 TransactionActionDrv block_dirty_bitmap_clear_drv = { 1979 .abort = block_dirty_bitmap_restore, 1980 .commit = block_dirty_bitmap_free_backup, 1981 .clean = g_free, 1982 }; 1983 1984 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action, 1985 Transaction *tran, Error **errp) 1986 { 1987 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 1988 1989 tran_add(tran, &block_dirty_bitmap_clear_drv, state); 1990 1991 state->bitmap = block_dirty_bitmap_lookup(action->node, 1992 action->name, 1993 &state->bs, 1994 errp); 1995 if (!state->bitmap) { 1996 return; 1997 } 1998 1999 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2000 return; 2001 } 2002 2003 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2004 } 2005 2006 static void block_dirty_bitmap_restore(void *opaque) 2007 { 2008 BlockDirtyBitmapState *state = opaque; 2009 2010 if (state->backup) { 2011 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2012 } 2013 } 2014 2015 static void block_dirty_bitmap_free_backup(void *opaque) 2016 { 2017 BlockDirtyBitmapState *state = opaque; 2018 2019 hbitmap_free(state->backup); 2020 } 2021 2022 static void block_dirty_bitmap_enable_abort(void *opaque); 2023 TransactionActionDrv block_dirty_bitmap_enable_drv = { 2024 .abort = block_dirty_bitmap_enable_abort, 2025 .clean = g_free, 2026 }; 2027 2028 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action, 2029 Transaction *tran, Error **errp) 2030 { 2031 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2032 2033 tran_add(tran, &block_dirty_bitmap_enable_drv, state); 2034 2035 state->bitmap = block_dirty_bitmap_lookup(action->node, 2036 action->name, 2037 NULL, 2038 errp); 2039 if (!state->bitmap) { 2040 return; 2041 } 2042 2043 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2044 return; 2045 } 2046 2047 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2048 bdrv_enable_dirty_bitmap(state->bitmap); 2049 } 2050 2051 static void block_dirty_bitmap_enable_abort(void *opaque) 2052 { 2053 BlockDirtyBitmapState *state = opaque; 2054 2055 if (!state->was_enabled) { 2056 bdrv_disable_dirty_bitmap(state->bitmap); 2057 } 2058 } 2059 2060 static void block_dirty_bitmap_disable_abort(void *opaque); 2061 TransactionActionDrv block_dirty_bitmap_disable_drv = { 2062 .abort = block_dirty_bitmap_disable_abort, 2063 .clean = g_free, 2064 }; 2065 2066 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action, 2067 Transaction *tran, Error **errp) 2068 { 2069 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2070 2071 tran_add(tran, &block_dirty_bitmap_disable_drv, state); 2072 2073 state->bitmap = block_dirty_bitmap_lookup(action->node, 2074 action->name, 2075 NULL, 2076 errp); 2077 if (!state->bitmap) { 2078 return; 2079 } 2080 2081 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2082 return; 2083 } 2084 2085 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2086 bdrv_disable_dirty_bitmap(state->bitmap); 2087 } 2088 2089 static void block_dirty_bitmap_disable_abort(void *opaque) 2090 { 2091 BlockDirtyBitmapState *state = opaque; 2092 2093 if (state->was_enabled) { 2094 bdrv_enable_dirty_bitmap(state->bitmap); 2095 } 2096 } 2097 2098 TransactionActionDrv block_dirty_bitmap_merge_drv = { 2099 .commit = block_dirty_bitmap_free_backup, 2100 .abort = block_dirty_bitmap_restore, 2101 .clean = g_free, 2102 }; 2103 2104 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action, 2105 Transaction *tran, Error **errp) 2106 { 2107 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2108 2109 tran_add(tran, &block_dirty_bitmap_merge_drv, state); 2110 2111 state->bitmap = block_dirty_bitmap_merge(action->node, action->target, 2112 action->bitmaps, &state->backup, 2113 errp); 2114 } 2115 2116 static void block_dirty_bitmap_remove_commit(void *opaque); 2117 static void block_dirty_bitmap_remove_abort(void *opaque); 2118 TransactionActionDrv block_dirty_bitmap_remove_drv = { 2119 .commit = block_dirty_bitmap_remove_commit, 2120 .abort = block_dirty_bitmap_remove_abort, 2121 .clean = g_free, 2122 }; 2123 2124 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action, 2125 Transaction *tran, Error **errp) 2126 { 2127 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1); 2128 2129 tran_add(tran, &block_dirty_bitmap_remove_drv, state); 2130 2131 2132 state->bitmap = block_dirty_bitmap_remove(action->node, action->name, 2133 false, &state->bs, errp); 2134 if (state->bitmap) { 2135 bdrv_dirty_bitmap_skip_store(state->bitmap, true); 2136 bdrv_dirty_bitmap_set_busy(state->bitmap, true); 2137 } 2138 } 2139 2140 static void block_dirty_bitmap_remove_abort(void *opaque) 2141 { 2142 BlockDirtyBitmapState *state = opaque; 2143 2144 if (state->bitmap) { 2145 bdrv_dirty_bitmap_skip_store(state->bitmap, false); 2146 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2147 } 2148 } 2149 2150 static void block_dirty_bitmap_remove_commit(void *opaque) 2151 { 2152 BlockDirtyBitmapState *state = opaque; 2153 2154 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2155 bdrv_release_dirty_bitmap(state->bitmap); 2156 } 2157 2158 static void abort_commit(void *opaque); 2159 TransactionActionDrv abort_drv = { 2160 .commit = abort_commit, 2161 }; 2162 2163 static void abort_action(Transaction *tran, Error **errp) 2164 { 2165 tran_add(tran, &abort_drv, NULL); 2166 error_setg(errp, "Transaction aborted using Abort action"); 2167 } 2168 2169 static void abort_commit(void *opaque) 2170 { 2171 g_assert_not_reached(); /* this action never succeeds */ 2172 } 2173 2174 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn, 2175 Transaction *tran, Error **errp) 2176 { 2177 switch (act->type) { 2178 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 2179 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 2180 external_snapshot_action(act, tran, errp); 2181 return; 2182 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP: 2183 drive_backup_action(act->u.drive_backup.data, 2184 block_job_txn, tran, errp); 2185 return; 2186 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP: 2187 blockdev_backup_action(act->u.blockdev_backup.data, 2188 block_job_txn, tran, errp); 2189 return; 2190 case TRANSACTION_ACTION_KIND_ABORT: 2191 abort_action(tran, errp); 2192 return; 2193 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC: 2194 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data, 2195 tran, errp); 2196 return; 2197 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD: 2198 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data, 2199 tran, errp); 2200 return; 2201 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR: 2202 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data, 2203 tran, errp); 2204 return; 2205 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE: 2206 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data, 2207 tran, errp); 2208 return; 2209 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE: 2210 block_dirty_bitmap_disable_action( 2211 act->u.block_dirty_bitmap_disable.data, tran, errp); 2212 return; 2213 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE: 2214 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data, 2215 tran, errp); 2216 return; 2217 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE: 2218 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data, 2219 tran, errp); 2220 return; 2221 /* 2222 * Where are transactions for MIRROR, COMMIT and STREAM? 2223 * Although these blockjobs use transaction callbacks like the backup job, 2224 * these jobs do not necessarily adhere to transaction semantics. 2225 * These jobs may not fully undo all of their actions on abort, nor do they 2226 * necessarily work in transactions with more than one job in them. 2227 */ 2228 case TRANSACTION_ACTION_KIND__MAX: 2229 default: 2230 g_assert_not_reached(); 2231 }; 2232 } 2233 2234 2235 /* 2236 * 'Atomic' group operations. The operations are performed as a set, and if 2237 * any fail then we roll back all operations in the group. 2238 * 2239 * Always run under BQL. 2240 */ 2241 void qmp_transaction(TransactionActionList *actions, 2242 struct TransactionProperties *properties, 2243 Error **errp) 2244 { 2245 TransactionActionList *act; 2246 JobTxn *block_job_txn = NULL; 2247 Error *local_err = NULL; 2248 Transaction *tran; 2249 ActionCompletionMode comp_mode = 2250 properties ? properties->completion_mode : 2251 ACTION_COMPLETION_MODE_INDIVIDUAL; 2252 2253 GLOBAL_STATE_CODE(); 2254 2255 /* Does this transaction get canceled as a group on failure? 2256 * If not, we don't really need to make a JobTxn. 2257 */ 2258 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2259 for (act = actions; act; act = act->next) { 2260 TransactionActionKind type = act->value->type; 2261 2262 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP && 2263 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP) 2264 { 2265 error_setg(errp, 2266 "Action '%s' does not support transaction property " 2267 "completion-mode = %s", 2268 TransactionActionKind_str(type), 2269 ActionCompletionMode_str(comp_mode)); 2270 return; 2271 } 2272 } 2273 2274 block_job_txn = job_txn_new(); 2275 } 2276 2277 /* drain all i/o before any operations */ 2278 bdrv_drain_all(); 2279 2280 tran = tran_new(); 2281 2282 /* We don't do anything in this loop that commits us to the operations */ 2283 for (act = actions; act; act = act->next) { 2284 transaction_action(act->value, block_job_txn, tran, &local_err); 2285 if (local_err) { 2286 error_propagate(errp, local_err); 2287 goto delete_and_fail; 2288 } 2289 } 2290 2291 tran_commit(tran); 2292 2293 /* success */ 2294 goto exit; 2295 2296 delete_and_fail: 2297 /* failure, and it is all-or-none; roll back all operations */ 2298 tran_abort(tran); 2299 exit: 2300 job_txn_unref(block_job_txn); 2301 } 2302 2303 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2304 const char *name, 2305 Error **errp) 2306 { 2307 BdrvDirtyBitmap *bitmap; 2308 BlockDriverState *bs; 2309 BlockDirtyBitmapSha256 *ret = NULL; 2310 char *sha256; 2311 2312 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2313 if (!bitmap || !bs) { 2314 return NULL; 2315 } 2316 2317 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2318 if (sha256 == NULL) { 2319 return NULL; 2320 } 2321 2322 ret = g_new(BlockDirtyBitmapSha256, 1); 2323 ret->sha256 = sha256; 2324 2325 return ret; 2326 } 2327 2328 void coroutine_fn qmp_block_resize(const char *device, const char *node_name, 2329 int64_t size, Error **errp) 2330 { 2331 Error *local_err = NULL; 2332 BlockBackend *blk; 2333 BlockDriverState *bs; 2334 AioContext *old_ctx; 2335 2336 bs = bdrv_lookup_bs(device, node_name, &local_err); 2337 if (local_err) { 2338 error_propagate(errp, local_err); 2339 return; 2340 } 2341 2342 if (size < 0) { 2343 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2344 return; 2345 } 2346 2347 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2348 error_setg(errp, QERR_DEVICE_IN_USE, device); 2349 return; 2350 } 2351 2352 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp); 2353 if (!blk) { 2354 return; 2355 } 2356 2357 bdrv_co_lock(bs); 2358 bdrv_drained_begin(bs); 2359 bdrv_co_unlock(bs); 2360 2361 old_ctx = bdrv_co_enter(bs); 2362 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); 2363 bdrv_co_leave(bs, old_ctx); 2364 2365 bdrv_co_lock(bs); 2366 bdrv_drained_end(bs); 2367 blk_co_unref(blk); 2368 bdrv_co_unlock(bs); 2369 } 2370 2371 void qmp_block_stream(const char *job_id, const char *device, 2372 const char *base, 2373 const char *base_node, 2374 const char *backing_file, 2375 const char *bottom, 2376 bool has_speed, int64_t speed, 2377 bool has_on_error, BlockdevOnError on_error, 2378 const char *filter_node_name, 2379 bool has_auto_finalize, bool auto_finalize, 2380 bool has_auto_dismiss, bool auto_dismiss, 2381 Error **errp) 2382 { 2383 BlockDriverState *bs, *iter, *iter_end; 2384 BlockDriverState *base_bs = NULL; 2385 BlockDriverState *bottom_bs = NULL; 2386 AioContext *aio_context; 2387 Error *local_err = NULL; 2388 int job_flags = JOB_DEFAULT; 2389 2390 if (base && base_node) { 2391 error_setg(errp, "'base' and 'base-node' cannot be specified " 2392 "at the same time"); 2393 return; 2394 } 2395 2396 if (base && bottom) { 2397 error_setg(errp, "'base' and 'bottom' cannot be specified " 2398 "at the same time"); 2399 return; 2400 } 2401 2402 if (bottom && base_node) { 2403 error_setg(errp, "'bottom' and 'base-node' cannot be specified " 2404 "at the same time"); 2405 return; 2406 } 2407 2408 if (!has_on_error) { 2409 on_error = BLOCKDEV_ON_ERROR_REPORT; 2410 } 2411 2412 bs = bdrv_lookup_bs(device, device, errp); 2413 if (!bs) { 2414 return; 2415 } 2416 2417 aio_context = bdrv_get_aio_context(bs); 2418 aio_context_acquire(aio_context); 2419 2420 if (base) { 2421 base_bs = bdrv_find_backing_image(bs, base); 2422 if (base_bs == NULL) { 2423 error_setg(errp, "Can't find '%s' in the backing chain", base); 2424 goto out; 2425 } 2426 assert(bdrv_get_aio_context(base_bs) == aio_context); 2427 } 2428 2429 if (base_node) { 2430 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2431 if (!base_bs) { 2432 goto out; 2433 } 2434 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 2435 error_setg(errp, "Node '%s' is not a backing image of '%s'", 2436 base_node, device); 2437 goto out; 2438 } 2439 assert(bdrv_get_aio_context(base_bs) == aio_context); 2440 bdrv_refresh_filename(base_bs); 2441 } 2442 2443 if (bottom) { 2444 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); 2445 if (!bottom_bs) { 2446 goto out; 2447 } 2448 if (!bottom_bs->drv) { 2449 error_setg(errp, "Node '%s' is not open", bottom); 2450 goto out; 2451 } 2452 if (bottom_bs->drv->is_filter) { 2453 error_setg(errp, "Node '%s' is a filter, use a non-filter node " 2454 "as 'bottom'", bottom); 2455 goto out; 2456 } 2457 if (!bdrv_chain_contains(bs, bottom_bs)) { 2458 error_setg(errp, "Node '%s' is not in a chain starting from '%s'", 2459 bottom, device); 2460 goto out; 2461 } 2462 assert(bdrv_get_aio_context(bottom_bs) == aio_context); 2463 } 2464 2465 /* 2466 * Check for op blockers in the whole chain between bs and base (or bottom) 2467 */ 2468 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; 2469 for (iter = bs; iter && iter != iter_end; 2470 iter = bdrv_filter_or_cow_bs(iter)) 2471 { 2472 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 2473 goto out; 2474 } 2475 } 2476 2477 /* if we are streaming the entire chain, the result will have no backing 2478 * file, and specifying one is therefore an error */ 2479 if (!base_bs && backing_file) { 2480 error_setg(errp, "backing file specified, but streaming the " 2481 "entire chain"); 2482 goto out; 2483 } 2484 2485 if (has_auto_finalize && !auto_finalize) { 2486 job_flags |= JOB_MANUAL_FINALIZE; 2487 } 2488 if (has_auto_dismiss && !auto_dismiss) { 2489 job_flags |= JOB_MANUAL_DISMISS; 2490 } 2491 2492 stream_start(job_id, bs, base_bs, backing_file, 2493 bottom_bs, job_flags, has_speed ? speed : 0, on_error, 2494 filter_node_name, &local_err); 2495 if (local_err) { 2496 error_propagate(errp, local_err); 2497 goto out; 2498 } 2499 2500 trace_qmp_block_stream(bs); 2501 2502 out: 2503 aio_context_release(aio_context); 2504 } 2505 2506 void qmp_block_commit(const char *job_id, const char *device, 2507 const char *base_node, 2508 const char *base, 2509 const char *top_node, 2510 const char *top, 2511 const char *backing_file, 2512 bool has_speed, int64_t speed, 2513 bool has_on_error, BlockdevOnError on_error, 2514 const char *filter_node_name, 2515 bool has_auto_finalize, bool auto_finalize, 2516 bool has_auto_dismiss, bool auto_dismiss, 2517 Error **errp) 2518 { 2519 BlockDriverState *bs; 2520 BlockDriverState *iter; 2521 BlockDriverState *base_bs, *top_bs; 2522 AioContext *aio_context; 2523 Error *local_err = NULL; 2524 int job_flags = JOB_DEFAULT; 2525 uint64_t top_perm, top_shared; 2526 2527 /* TODO We'll eventually have to take a writer lock in this function */ 2528 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2529 2530 if (!has_speed) { 2531 speed = 0; 2532 } 2533 if (!has_on_error) { 2534 on_error = BLOCKDEV_ON_ERROR_REPORT; 2535 } 2536 if (has_auto_finalize && !auto_finalize) { 2537 job_flags |= JOB_MANUAL_FINALIZE; 2538 } 2539 if (has_auto_dismiss && !auto_dismiss) { 2540 job_flags |= JOB_MANUAL_DISMISS; 2541 } 2542 2543 /* Important Note: 2544 * libvirt relies on the DeviceNotFound error class in order to probe for 2545 * live commit feature versions; for this to work, we must make sure to 2546 * perform the device lookup before any generic errors that may occur in a 2547 * scenario in which all optional arguments are omitted. */ 2548 bs = qmp_get_root_bs(device, &local_err); 2549 if (!bs) { 2550 bs = bdrv_lookup_bs(device, device, NULL); 2551 if (!bs) { 2552 error_free(local_err); 2553 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2554 "Device '%s' not found", device); 2555 } else { 2556 error_propagate(errp, local_err); 2557 } 2558 return; 2559 } 2560 2561 aio_context = bdrv_get_aio_context(bs); 2562 aio_context_acquire(aio_context); 2563 2564 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2565 goto out; 2566 } 2567 2568 /* default top_bs is the active layer */ 2569 top_bs = bs; 2570 2571 if (top_node && top) { 2572 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 2573 goto out; 2574 } else if (top_node) { 2575 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 2576 if (top_bs == NULL) { 2577 goto out; 2578 } 2579 if (!bdrv_chain_contains(bs, top_bs)) { 2580 error_setg(errp, "'%s' is not in this backing file chain", 2581 top_node); 2582 goto out; 2583 } 2584 } else if (top) { 2585 /* This strcmp() is just a shortcut, there is no need to 2586 * refresh @bs's filename. If it mismatches, 2587 * bdrv_find_backing_image() will do the refresh and may still 2588 * return @bs. */ 2589 if (strcmp(bs->filename, top) != 0) { 2590 top_bs = bdrv_find_backing_image(bs, top); 2591 } 2592 } 2593 2594 if (top_bs == NULL) { 2595 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2596 goto out; 2597 } 2598 2599 assert(bdrv_get_aio_context(top_bs) == aio_context); 2600 2601 if (base_node && base) { 2602 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 2603 goto out; 2604 } else if (base_node) { 2605 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 2606 if (base_bs == NULL) { 2607 goto out; 2608 } 2609 if (!bdrv_chain_contains(top_bs, base_bs)) { 2610 error_setg(errp, "'%s' is not in this backing file chain", 2611 base_node); 2612 goto out; 2613 } 2614 } else if (base) { 2615 base_bs = bdrv_find_backing_image(top_bs, base); 2616 if (base_bs == NULL) { 2617 error_setg(errp, "Can't find '%s' in the backing chain", base); 2618 goto out; 2619 } 2620 } else { 2621 base_bs = bdrv_find_base(top_bs); 2622 if (base_bs == NULL) { 2623 error_setg(errp, "There is no backimg image"); 2624 goto out; 2625 } 2626 } 2627 2628 assert(bdrv_get_aio_context(base_bs) == aio_context); 2629 2630 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); 2631 iter = bdrv_filter_or_cow_bs(iter)) 2632 { 2633 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2634 goto out; 2635 } 2636 } 2637 2638 /* Do not allow attempts to commit an image into itself */ 2639 if (top_bs == base_bs) { 2640 error_setg(errp, "cannot commit an image into itself"); 2641 goto out; 2642 } 2643 2644 /* 2645 * Active commit is required if and only if someone has taken a 2646 * WRITE permission on the top node. Historically, we have always 2647 * used active commit for top nodes, so continue that practice 2648 * lest we possibly break clients that rely on this behavior, e.g. 2649 * to later attach this node to a writing parent. 2650 * (Active commit is never really wrong.) 2651 */ 2652 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); 2653 if (top_perm & BLK_PERM_WRITE || 2654 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) 2655 { 2656 if (backing_file) { 2657 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { 2658 error_setg(errp, "'backing-file' specified," 2659 " but 'top' is the active layer"); 2660 } else { 2661 error_setg(errp, "'backing-file' specified, but 'top' has a " 2662 "writer on it"); 2663 } 2664 goto out; 2665 } 2666 if (!job_id) { 2667 /* 2668 * Emulate here what block_job_create() does, because it 2669 * is possible that @bs != @top_bs (the block job should 2670 * be named after @bs, even if @top_bs is the actual 2671 * source) 2672 */ 2673 job_id = bdrv_get_device_name(bs); 2674 } 2675 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, 2676 filter_node_name, NULL, NULL, false, &local_err); 2677 } else { 2678 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 2679 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2680 goto out; 2681 } 2682 commit_start(job_id, bs, base_bs, top_bs, job_flags, 2683 speed, on_error, backing_file, 2684 filter_node_name, &local_err); 2685 } 2686 if (local_err != NULL) { 2687 error_propagate(errp, local_err); 2688 goto out; 2689 } 2690 2691 out: 2692 aio_context_release(aio_context); 2693 } 2694 2695 /* Common QMP interface for drive-backup and blockdev-backup */ 2696 static BlockJob *do_backup_common(BackupCommon *backup, 2697 BlockDriverState *bs, 2698 BlockDriverState *target_bs, 2699 AioContext *aio_context, 2700 JobTxn *txn, Error **errp) 2701 { 2702 BlockJob *job = NULL; 2703 BdrvDirtyBitmap *bmap = NULL; 2704 BackupPerf perf = { .max_workers = 64 }; 2705 int job_flags = JOB_DEFAULT; 2706 2707 if (!backup->has_speed) { 2708 backup->speed = 0; 2709 } 2710 if (!backup->has_on_source_error) { 2711 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2712 } 2713 if (!backup->has_on_target_error) { 2714 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2715 } 2716 if (!backup->has_auto_finalize) { 2717 backup->auto_finalize = true; 2718 } 2719 if (!backup->has_auto_dismiss) { 2720 backup->auto_dismiss = true; 2721 } 2722 if (!backup->has_compress) { 2723 backup->compress = false; 2724 } 2725 2726 if (backup->x_perf) { 2727 if (backup->x_perf->has_use_copy_range) { 2728 perf.use_copy_range = backup->x_perf->use_copy_range; 2729 } 2730 if (backup->x_perf->has_max_workers) { 2731 perf.max_workers = backup->x_perf->max_workers; 2732 } 2733 if (backup->x_perf->has_max_chunk) { 2734 perf.max_chunk = backup->x_perf->max_chunk; 2735 } 2736 } 2737 2738 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || 2739 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { 2740 /* done before desugaring 'incremental' to print the right message */ 2741 if (!backup->bitmap) { 2742 error_setg(errp, "must provide a valid bitmap name for " 2743 "'%s' sync mode", MirrorSyncMode_str(backup->sync)); 2744 return NULL; 2745 } 2746 } 2747 2748 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { 2749 if (backup->has_bitmap_mode && 2750 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { 2751 error_setg(errp, "Bitmap sync mode must be '%s' " 2752 "when using sync mode '%s'", 2753 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), 2754 MirrorSyncMode_str(backup->sync)); 2755 return NULL; 2756 } 2757 backup->has_bitmap_mode = true; 2758 backup->sync = MIRROR_SYNC_MODE_BITMAP; 2759 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; 2760 } 2761 2762 if (backup->bitmap) { 2763 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 2764 if (!bmap) { 2765 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 2766 return NULL; 2767 } 2768 if (!backup->has_bitmap_mode) { 2769 error_setg(errp, "Bitmap sync mode must be given " 2770 "when providing a bitmap"); 2771 return NULL; 2772 } 2773 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2774 return NULL; 2775 } 2776 2777 /* This does not produce a useful bitmap artifact: */ 2778 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 2779 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" 2780 " outputs", MirrorSyncMode_str(backup->sync)); 2781 return NULL; 2782 } 2783 2784 /* If the bitmap isn't used for input or output, this is useless: */ 2785 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && 2786 backup->sync != MIRROR_SYNC_MODE_BITMAP) { 2787 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" 2788 " when combined with sync mode '%s'", 2789 BitmapSyncMode_str(backup->bitmap_mode), 2790 MirrorSyncMode_str(backup->sync)); 2791 return NULL; 2792 } 2793 } 2794 2795 if (!backup->bitmap && backup->has_bitmap_mode) { 2796 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); 2797 return NULL; 2798 } 2799 2800 if (!backup->auto_finalize) { 2801 job_flags |= JOB_MANUAL_FINALIZE; 2802 } 2803 if (!backup->auto_dismiss) { 2804 job_flags |= JOB_MANUAL_DISMISS; 2805 } 2806 2807 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 2808 backup->sync, bmap, backup->bitmap_mode, 2809 backup->compress, 2810 backup->filter_node_name, 2811 &perf, 2812 backup->on_source_error, 2813 backup->on_target_error, 2814 job_flags, NULL, NULL, txn, errp); 2815 return job; 2816 } 2817 2818 void qmp_drive_backup(DriveBackup *backup, Error **errp) 2819 { 2820 TransactionAction action = { 2821 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, 2822 .u.drive_backup.data = backup, 2823 }; 2824 blockdev_do_action(&action, errp); 2825 } 2826 2827 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, 2828 bool flat, 2829 Error **errp) 2830 { 2831 bool return_flat = has_flat && flat; 2832 2833 return bdrv_named_nodes_list(return_flat, errp); 2834 } 2835 2836 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 2837 { 2838 return bdrv_get_xdbg_block_graph(errp); 2839 } 2840 2841 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) 2842 { 2843 TransactionAction action = { 2844 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, 2845 .u.blockdev_backup.data = backup, 2846 }; 2847 blockdev_do_action(&action, errp); 2848 } 2849 2850 /* Parameter check and block job starting for drive mirroring. 2851 * Caller should hold @device and @target's aio context (must be the same). 2852 **/ 2853 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 2854 BlockDriverState *target, 2855 const char *replaces, 2856 enum MirrorSyncMode sync, 2857 BlockMirrorBackingMode backing_mode, 2858 bool zero_target, 2859 bool has_speed, int64_t speed, 2860 bool has_granularity, uint32_t granularity, 2861 bool has_buf_size, int64_t buf_size, 2862 bool has_on_source_error, 2863 BlockdevOnError on_source_error, 2864 bool has_on_target_error, 2865 BlockdevOnError on_target_error, 2866 bool has_unmap, bool unmap, 2867 const char *filter_node_name, 2868 bool has_copy_mode, MirrorCopyMode copy_mode, 2869 bool has_auto_finalize, bool auto_finalize, 2870 bool has_auto_dismiss, bool auto_dismiss, 2871 Error **errp) 2872 { 2873 BlockDriverState *unfiltered_bs; 2874 int job_flags = JOB_DEFAULT; 2875 2876 GLOBAL_STATE_CODE(); 2877 GRAPH_RDLOCK_GUARD_MAINLOOP(); 2878 2879 if (!has_speed) { 2880 speed = 0; 2881 } 2882 if (!has_on_source_error) { 2883 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2884 } 2885 if (!has_on_target_error) { 2886 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2887 } 2888 if (!has_granularity) { 2889 granularity = 0; 2890 } 2891 if (!has_buf_size) { 2892 buf_size = 0; 2893 } 2894 if (!has_unmap) { 2895 unmap = true; 2896 } 2897 if (!has_copy_mode) { 2898 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 2899 } 2900 if (has_auto_finalize && !auto_finalize) { 2901 job_flags |= JOB_MANUAL_FINALIZE; 2902 } 2903 if (has_auto_dismiss && !auto_dismiss) { 2904 job_flags |= JOB_MANUAL_DISMISS; 2905 } 2906 2907 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2908 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2909 "a value in range [512B, 64MB]"); 2910 return; 2911 } 2912 if (granularity & (granularity - 1)) { 2913 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2914 "a power of 2"); 2915 return; 2916 } 2917 2918 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 2919 return; 2920 } 2921 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 2922 return; 2923 } 2924 2925 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { 2926 sync = MIRROR_SYNC_MODE_FULL; 2927 } 2928 2929 if (!replaces) { 2930 /* We want to mirror from @bs, but keep implicit filters on top */ 2931 unfiltered_bs = bdrv_skip_implicit_filters(bs); 2932 if (unfiltered_bs != bs) { 2933 replaces = unfiltered_bs->node_name; 2934 } 2935 } 2936 2937 if (replaces) { 2938 BlockDriverState *to_replace_bs; 2939 AioContext *replace_aio_context; 2940 int64_t bs_size, replace_size; 2941 2942 bs_size = bdrv_getlength(bs); 2943 if (bs_size < 0) { 2944 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 2945 return; 2946 } 2947 2948 to_replace_bs = check_to_replace_node(bs, replaces, errp); 2949 if (!to_replace_bs) { 2950 return; 2951 } 2952 2953 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2954 aio_context_acquire(replace_aio_context); 2955 replace_size = bdrv_getlength(to_replace_bs); 2956 aio_context_release(replace_aio_context); 2957 2958 if (replace_size < 0) { 2959 error_setg_errno(errp, -replace_size, 2960 "Failed to query the replacement node's size"); 2961 return; 2962 } 2963 if (bs_size != replace_size) { 2964 error_setg(errp, "cannot replace image with a mirror image of " 2965 "different size"); 2966 return; 2967 } 2968 } 2969 2970 /* pass the node name to replace to mirror start since it's loose coupling 2971 * and will allow to check whether the node still exist at mirror completion 2972 */ 2973 mirror_start(job_id, bs, target, 2974 replaces, job_flags, 2975 speed, granularity, buf_size, sync, backing_mode, zero_target, 2976 on_source_error, on_target_error, unmap, filter_node_name, 2977 copy_mode, errp); 2978 } 2979 2980 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 2981 { 2982 BlockDriverState *bs; 2983 BlockDriverState *target_backing_bs, *target_bs; 2984 AioContext *aio_context; 2985 AioContext *old_context; 2986 BlockMirrorBackingMode backing_mode; 2987 Error *local_err = NULL; 2988 QDict *options = NULL; 2989 int flags; 2990 int64_t size; 2991 const char *format = arg->format; 2992 bool zero_target; 2993 int ret; 2994 2995 bs = qmp_get_root_bs(arg->device, errp); 2996 if (!bs) { 2997 return; 2998 } 2999 3000 /* Early check to avoid creating target */ 3001 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3002 return; 3003 } 3004 3005 aio_context = bdrv_get_aio_context(bs); 3006 aio_context_acquire(aio_context); 3007 3008 if (!arg->has_mode) { 3009 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3010 } 3011 3012 if (!arg->format) { 3013 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3014 ? NULL : bs->drv->format_name); 3015 } 3016 3017 flags = bs->open_flags | BDRV_O_RDWR; 3018 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); 3019 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { 3020 arg->sync = MIRROR_SYNC_MODE_FULL; 3021 } 3022 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3023 target_backing_bs = bs; 3024 } 3025 3026 size = bdrv_getlength(bs); 3027 if (size < 0) { 3028 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3029 goto out; 3030 } 3031 3032 if (arg->replaces) { 3033 if (!arg->node_name) { 3034 error_setg(errp, "a node-name must be provided when replacing a" 3035 " named node of the graph"); 3036 goto out; 3037 } 3038 } 3039 3040 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3041 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3042 } else { 3043 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3044 } 3045 3046 /* Don't open backing image in create() */ 3047 flags |= BDRV_O_NO_BACKING; 3048 3049 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) 3050 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3051 { 3052 /* create new image w/o backing file */ 3053 assert(format); 3054 bdrv_img_create(arg->target, format, 3055 NULL, NULL, NULL, size, flags, false, &local_err); 3056 } else { 3057 /* Implicit filters should not appear in the filename */ 3058 BlockDriverState *explicit_backing = 3059 bdrv_skip_implicit_filters(target_backing_bs); 3060 3061 switch (arg->mode) { 3062 case NEW_IMAGE_MODE_EXISTING: 3063 break; 3064 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3065 /* create new image with backing file */ 3066 bdrv_refresh_filename(explicit_backing); 3067 bdrv_img_create(arg->target, format, 3068 explicit_backing->filename, 3069 explicit_backing->drv->format_name, 3070 NULL, size, flags, false, &local_err); 3071 break; 3072 default: 3073 abort(); 3074 } 3075 } 3076 3077 if (local_err) { 3078 error_propagate(errp, local_err); 3079 goto out; 3080 } 3081 3082 options = qdict_new(); 3083 if (arg->node_name) { 3084 qdict_put_str(options, "node-name", arg->node_name); 3085 } 3086 if (format) { 3087 qdict_put_str(options, "driver", format); 3088 } 3089 aio_context_release(aio_context); 3090 3091 /* Mirroring takes care of copy-on-write using the source's backing 3092 * file. 3093 */ 3094 aio_context_acquire(qemu_get_aio_context()); 3095 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3096 aio_context_release(qemu_get_aio_context()); 3097 3098 if (!target_bs) { 3099 return; 3100 } 3101 3102 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && 3103 (arg->mode == NEW_IMAGE_MODE_EXISTING || 3104 !bdrv_has_zero_init(target_bs))); 3105 3106 3107 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 3108 old_context = bdrv_get_aio_context(target_bs); 3109 aio_context_acquire(old_context); 3110 3111 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3112 if (ret < 0) { 3113 bdrv_unref(target_bs); 3114 aio_context_release(old_context); 3115 return; 3116 } 3117 3118 aio_context_release(old_context); 3119 aio_context_acquire(aio_context); 3120 3121 blockdev_mirror_common(arg->job_id, bs, target_bs, 3122 arg->replaces, arg->sync, 3123 backing_mode, zero_target, 3124 arg->has_speed, arg->speed, 3125 arg->has_granularity, arg->granularity, 3126 arg->has_buf_size, arg->buf_size, 3127 arg->has_on_source_error, arg->on_source_error, 3128 arg->has_on_target_error, arg->on_target_error, 3129 arg->has_unmap, arg->unmap, 3130 NULL, 3131 arg->has_copy_mode, arg->copy_mode, 3132 arg->has_auto_finalize, arg->auto_finalize, 3133 arg->has_auto_dismiss, arg->auto_dismiss, 3134 errp); 3135 bdrv_unref(target_bs); 3136 out: 3137 aio_context_release(aio_context); 3138 } 3139 3140 void qmp_blockdev_mirror(const char *job_id, 3141 const char *device, const char *target, 3142 const char *replaces, 3143 MirrorSyncMode sync, 3144 bool has_speed, int64_t speed, 3145 bool has_granularity, uint32_t granularity, 3146 bool has_buf_size, int64_t buf_size, 3147 bool has_on_source_error, 3148 BlockdevOnError on_source_error, 3149 bool has_on_target_error, 3150 BlockdevOnError on_target_error, 3151 const char *filter_node_name, 3152 bool has_copy_mode, MirrorCopyMode copy_mode, 3153 bool has_auto_finalize, bool auto_finalize, 3154 bool has_auto_dismiss, bool auto_dismiss, 3155 Error **errp) 3156 { 3157 BlockDriverState *bs; 3158 BlockDriverState *target_bs; 3159 AioContext *aio_context; 3160 AioContext *old_context; 3161 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3162 bool zero_target; 3163 int ret; 3164 3165 bs = qmp_get_root_bs(device, errp); 3166 if (!bs) { 3167 return; 3168 } 3169 3170 target_bs = bdrv_lookup_bs(target, target, errp); 3171 if (!target_bs) { 3172 return; 3173 } 3174 3175 zero_target = (sync == MIRROR_SYNC_MODE_FULL); 3176 3177 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */ 3178 old_context = bdrv_get_aio_context(target_bs); 3179 aio_context = bdrv_get_aio_context(bs); 3180 aio_context_acquire(old_context); 3181 3182 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp); 3183 3184 aio_context_release(old_context); 3185 aio_context_acquire(aio_context); 3186 3187 if (ret < 0) { 3188 goto out; 3189 } 3190 3191 blockdev_mirror_common(job_id, bs, target_bs, 3192 replaces, sync, backing_mode, 3193 zero_target, has_speed, speed, 3194 has_granularity, granularity, 3195 has_buf_size, buf_size, 3196 has_on_source_error, on_source_error, 3197 has_on_target_error, on_target_error, 3198 true, true, filter_node_name, 3199 has_copy_mode, copy_mode, 3200 has_auto_finalize, auto_finalize, 3201 has_auto_dismiss, auto_dismiss, 3202 errp); 3203 out: 3204 aio_context_release(aio_context); 3205 } 3206 3207 /* 3208 * Get a block job using its ID. Called with job_mutex held. 3209 */ 3210 static BlockJob *find_block_job_locked(const char *id, Error **errp) 3211 { 3212 BlockJob *job; 3213 3214 assert(id != NULL); 3215 3216 job = block_job_get_locked(id); 3217 3218 if (!job) { 3219 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3220 "Block job '%s' not found", id); 3221 return NULL; 3222 } 3223 3224 return job; 3225 } 3226 3227 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3228 { 3229 BlockJob *job; 3230 3231 JOB_LOCK_GUARD(); 3232 job = find_block_job_locked(device, errp); 3233 3234 if (!job) { 3235 return; 3236 } 3237 3238 block_job_set_speed_locked(job, speed, errp); 3239 } 3240 3241 void qmp_block_job_cancel(const char *device, 3242 bool has_force, bool force, Error **errp) 3243 { 3244 BlockJob *job; 3245 3246 JOB_LOCK_GUARD(); 3247 job = find_block_job_locked(device, errp); 3248 3249 if (!job) { 3250 return; 3251 } 3252 3253 if (!has_force) { 3254 force = false; 3255 } 3256 3257 if (job_user_paused_locked(&job->job) && !force) { 3258 error_setg(errp, "The block job for device '%s' is currently paused", 3259 device); 3260 return; 3261 } 3262 3263 trace_qmp_block_job_cancel(job); 3264 job_user_cancel_locked(&job->job, force, errp); 3265 } 3266 3267 void qmp_block_job_pause(const char *device, Error **errp) 3268 { 3269 BlockJob *job; 3270 3271 JOB_LOCK_GUARD(); 3272 job = find_block_job_locked(device, errp); 3273 3274 if (!job) { 3275 return; 3276 } 3277 3278 trace_qmp_block_job_pause(job); 3279 job_user_pause_locked(&job->job, errp); 3280 } 3281 3282 void qmp_block_job_resume(const char *device, Error **errp) 3283 { 3284 BlockJob *job; 3285 3286 JOB_LOCK_GUARD(); 3287 job = find_block_job_locked(device, errp); 3288 3289 if (!job) { 3290 return; 3291 } 3292 3293 trace_qmp_block_job_resume(job); 3294 job_user_resume_locked(&job->job, errp); 3295 } 3296 3297 void qmp_block_job_complete(const char *device, Error **errp) 3298 { 3299 BlockJob *job; 3300 3301 JOB_LOCK_GUARD(); 3302 job = find_block_job_locked(device, errp); 3303 3304 if (!job) { 3305 return; 3306 } 3307 3308 trace_qmp_block_job_complete(job); 3309 job_complete_locked(&job->job, errp); 3310 } 3311 3312 void qmp_block_job_finalize(const char *id, Error **errp) 3313 { 3314 BlockJob *job; 3315 3316 JOB_LOCK_GUARD(); 3317 job = find_block_job_locked(id, errp); 3318 3319 if (!job) { 3320 return; 3321 } 3322 3323 trace_qmp_block_job_finalize(job); 3324 job_ref_locked(&job->job); 3325 job_finalize_locked(&job->job, errp); 3326 3327 job_unref_locked(&job->job); 3328 } 3329 3330 void qmp_block_job_dismiss(const char *id, Error **errp) 3331 { 3332 BlockJob *bjob; 3333 Job *job; 3334 3335 JOB_LOCK_GUARD(); 3336 bjob = find_block_job_locked(id, errp); 3337 3338 if (!bjob) { 3339 return; 3340 } 3341 3342 trace_qmp_block_job_dismiss(bjob); 3343 job = &bjob->job; 3344 job_dismiss_locked(&job, errp); 3345 } 3346 3347 void qmp_change_backing_file(const char *device, 3348 const char *image_node_name, 3349 const char *backing_file, 3350 Error **errp) 3351 { 3352 BlockDriverState *bs = NULL; 3353 AioContext *aio_context; 3354 BlockDriverState *image_bs = NULL; 3355 Error *local_err = NULL; 3356 bool ro; 3357 int ret; 3358 3359 bs = qmp_get_root_bs(device, errp); 3360 if (!bs) { 3361 return; 3362 } 3363 3364 aio_context = bdrv_get_aio_context(bs); 3365 aio_context_acquire(aio_context); 3366 3367 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3368 if (local_err) { 3369 error_propagate(errp, local_err); 3370 goto out; 3371 } 3372 3373 if (!image_bs) { 3374 error_setg(errp, "image file not found"); 3375 goto out; 3376 } 3377 3378 if (bdrv_find_base(image_bs) == image_bs) { 3379 error_setg(errp, "not allowing backing file change on an image " 3380 "without a backing file"); 3381 goto out; 3382 } 3383 3384 /* even though we are not necessarily operating on bs, we need it to 3385 * determine if block ops are currently prohibited on the chain */ 3386 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3387 goto out; 3388 } 3389 3390 /* final sanity check */ 3391 if (!bdrv_chain_contains(bs, image_bs)) { 3392 error_setg(errp, "'%s' and image file are not in the same chain", 3393 device); 3394 goto out; 3395 } 3396 3397 /* if not r/w, reopen to make r/w */ 3398 ro = bdrv_is_read_only(image_bs); 3399 3400 if (ro) { 3401 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 3402 goto out; 3403 } 3404 } 3405 3406 ret = bdrv_change_backing_file(image_bs, backing_file, 3407 image_bs->drv ? image_bs->drv->format_name : "", 3408 false); 3409 3410 if (ret < 0) { 3411 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3412 backing_file); 3413 /* don't exit here, so we can try to restore open flags if 3414 * appropriate */ 3415 } 3416 3417 if (ro) { 3418 bdrv_reopen_set_read_only(image_bs, true, errp); 3419 } 3420 3421 out: 3422 aio_context_release(aio_context); 3423 } 3424 3425 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3426 { 3427 BlockDriverState *bs; 3428 QObject *obj; 3429 Visitor *v = qobject_output_visitor_new(&obj); 3430 QDict *qdict; 3431 3432 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3433 visit_complete(v, &obj); 3434 qdict = qobject_to(QDict, obj); 3435 3436 qdict_flatten(qdict); 3437 3438 if (!qdict_get_try_str(qdict, "node-name")) { 3439 error_setg(errp, "'node-name' must be specified for the root node"); 3440 goto fail; 3441 } 3442 3443 bs = bds_tree_init(qdict, errp); 3444 if (!bs) { 3445 goto fail; 3446 } 3447 3448 bdrv_set_monitor_owned(bs); 3449 3450 fail: 3451 visit_free(v); 3452 } 3453 3454 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp) 3455 { 3456 BlockReopenQueue *queue = NULL; 3457 3458 /* Add each one of the BDS that we want to reopen to the queue */ 3459 for (; reopen_list != NULL; reopen_list = reopen_list->next) { 3460 BlockdevOptions *options = reopen_list->value; 3461 BlockDriverState *bs; 3462 AioContext *ctx; 3463 QObject *obj; 3464 Visitor *v; 3465 QDict *qdict; 3466 3467 /* Check for the selected node name */ 3468 if (!options->node_name) { 3469 error_setg(errp, "node-name not specified"); 3470 goto fail; 3471 } 3472 3473 bs = bdrv_find_node(options->node_name); 3474 if (!bs) { 3475 error_setg(errp, "Failed to find node with node-name='%s'", 3476 options->node_name); 3477 goto fail; 3478 } 3479 3480 /* Put all options in a QDict and flatten it */ 3481 v = qobject_output_visitor_new(&obj); 3482 visit_type_BlockdevOptions(v, NULL, &options, &error_abort); 3483 visit_complete(v, &obj); 3484 visit_free(v); 3485 3486 qdict = qobject_to(QDict, obj); 3487 3488 qdict_flatten(qdict); 3489 3490 ctx = bdrv_get_aio_context(bs); 3491 aio_context_acquire(ctx); 3492 3493 queue = bdrv_reopen_queue(queue, bs, qdict, false); 3494 3495 aio_context_release(ctx); 3496 } 3497 3498 /* Perform the reopen operation */ 3499 bdrv_reopen_multiple(queue, errp); 3500 queue = NULL; 3501 3502 fail: 3503 bdrv_reopen_queue_free(queue); 3504 } 3505 3506 void qmp_blockdev_del(const char *node_name, Error **errp) 3507 { 3508 AioContext *aio_context; 3509 BlockDriverState *bs; 3510 3511 GLOBAL_STATE_CODE(); 3512 3513 bs = bdrv_find_node(node_name); 3514 if (!bs) { 3515 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3516 return; 3517 } 3518 if (bdrv_has_blk(bs)) { 3519 error_setg(errp, "Node %s is in use", node_name); 3520 return; 3521 } 3522 aio_context = bdrv_get_aio_context(bs); 3523 aio_context_acquire(aio_context); 3524 3525 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 3526 goto out; 3527 } 3528 3529 if (!QTAILQ_IN_USE(bs, monitor_list)) { 3530 error_setg(errp, "Node %s is not owned by the monitor", 3531 bs->node_name); 3532 goto out; 3533 } 3534 3535 if (bs->refcnt > 1) { 3536 error_setg(errp, "Block device %s is in use", 3537 bdrv_get_device_or_node_name(bs)); 3538 goto out; 3539 } 3540 3541 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 3542 bdrv_unref(bs); 3543 3544 out: 3545 aio_context_release(aio_context); 3546 } 3547 3548 static BdrvChild * GRAPH_RDLOCK 3549 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name) 3550 { 3551 BdrvChild *child; 3552 3553 QLIST_FOREACH(child, &parent_bs->children, next) { 3554 if (strcmp(child->name, child_name) == 0) { 3555 return child; 3556 } 3557 } 3558 3559 return NULL; 3560 } 3561 3562 void qmp_x_blockdev_change(const char *parent, const char *child, 3563 const char *node, Error **errp) 3564 { 3565 BlockDriverState *parent_bs, *new_bs = NULL; 3566 BdrvChild *p_child; 3567 3568 bdrv_graph_wrlock(NULL); 3569 3570 parent_bs = bdrv_lookup_bs(parent, parent, errp); 3571 if (!parent_bs) { 3572 goto out; 3573 } 3574 3575 if (!child == !node) { 3576 if (child) { 3577 error_setg(errp, "The parameters child and node are in conflict"); 3578 } else { 3579 error_setg(errp, "Either child or node must be specified"); 3580 } 3581 goto out; 3582 } 3583 3584 if (child) { 3585 p_child = bdrv_find_child(parent_bs, child); 3586 if (!p_child) { 3587 error_setg(errp, "Node '%s' does not have child '%s'", 3588 parent, child); 3589 goto out; 3590 } 3591 bdrv_del_child(parent_bs, p_child, errp); 3592 } 3593 3594 if (node) { 3595 new_bs = bdrv_find_node(node); 3596 if (!new_bs) { 3597 error_setg(errp, "Node '%s' not found", node); 3598 goto out; 3599 } 3600 bdrv_add_child(parent_bs, new_bs, errp); 3601 } 3602 3603 out: 3604 bdrv_graph_wrunlock(); 3605 } 3606 3607 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3608 { 3609 BlockJobInfoList *head = NULL, **tail = &head; 3610 BlockJob *job; 3611 3612 JOB_LOCK_GUARD(); 3613 3614 for (job = block_job_next_locked(NULL); job; 3615 job = block_job_next_locked(job)) { 3616 BlockJobInfo *value; 3617 3618 if (block_job_is_internal(job)) { 3619 continue; 3620 } 3621 value = block_job_query_locked(job, errp); 3622 if (!value) { 3623 qapi_free_BlockJobInfoList(head); 3624 return NULL; 3625 } 3626 QAPI_LIST_APPEND(tail, value); 3627 } 3628 3629 return head; 3630 } 3631 3632 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 3633 bool has_force, bool force, Error **errp) 3634 { 3635 AioContext *old_context; 3636 AioContext *new_context; 3637 BlockDriverState *bs; 3638 3639 bs = bdrv_find_node(node_name); 3640 if (!bs) { 3641 error_setg(errp, "Failed to find node with node-name='%s'", node_name); 3642 return; 3643 } 3644 3645 /* Protects against accidents. */ 3646 if (!(has_force && force) && bdrv_has_blk(bs)) { 3647 error_setg(errp, "Node %s is associated with a BlockBackend and could " 3648 "be in use (use force=true to override this check)", 3649 node_name); 3650 return; 3651 } 3652 3653 if (iothread->type == QTYPE_QSTRING) { 3654 IOThread *obj = iothread_by_id(iothread->u.s); 3655 if (!obj) { 3656 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 3657 return; 3658 } 3659 3660 new_context = iothread_get_aio_context(obj); 3661 } else { 3662 new_context = qemu_get_aio_context(); 3663 } 3664 3665 old_context = bdrv_get_aio_context(bs); 3666 aio_context_acquire(old_context); 3667 3668 bdrv_try_change_aio_context(bs, new_context, NULL, errp); 3669 3670 aio_context_release(old_context); 3671 } 3672 3673 QemuOptsList qemu_common_drive_opts = { 3674 .name = "drive", 3675 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3676 .desc = { 3677 { 3678 .name = "snapshot", 3679 .type = QEMU_OPT_BOOL, 3680 .help = "enable/disable snapshot mode", 3681 },{ 3682 .name = "aio", 3683 .type = QEMU_OPT_STRING, 3684 .help = "host AIO implementation (threads, native, io_uring)", 3685 },{ 3686 .name = BDRV_OPT_CACHE_WB, 3687 .type = QEMU_OPT_BOOL, 3688 .help = "Enable writeback mode", 3689 },{ 3690 .name = "format", 3691 .type = QEMU_OPT_STRING, 3692 .help = "disk format (raw, qcow2, ...)", 3693 },{ 3694 .name = "rerror", 3695 .type = QEMU_OPT_STRING, 3696 .help = "read error action", 3697 },{ 3698 .name = "werror", 3699 .type = QEMU_OPT_STRING, 3700 .help = "write error action", 3701 },{ 3702 .name = BDRV_OPT_READ_ONLY, 3703 .type = QEMU_OPT_BOOL, 3704 .help = "open drive file as read-only", 3705 }, 3706 3707 THROTTLE_OPTS, 3708 3709 { 3710 .name = "throttling.group", 3711 .type = QEMU_OPT_STRING, 3712 .help = "name of the block throttling group", 3713 },{ 3714 .name = "copy-on-read", 3715 .type = QEMU_OPT_BOOL, 3716 .help = "copy read data from backing file into image file", 3717 },{ 3718 .name = "detect-zeroes", 3719 .type = QEMU_OPT_STRING, 3720 .help = "try to optimize zero writes (off, on, unmap)", 3721 },{ 3722 .name = "stats-account-invalid", 3723 .type = QEMU_OPT_BOOL, 3724 .help = "whether to account for invalid I/O operations " 3725 "in the statistics", 3726 },{ 3727 .name = "stats-account-failed", 3728 .type = QEMU_OPT_BOOL, 3729 .help = "whether to account for failed I/O operations " 3730 "in the statistics", 3731 }, 3732 { /* end of list */ } 3733 }, 3734 }; 3735 3736 QemuOptsList qemu_drive_opts = { 3737 .name = "drive", 3738 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3739 .desc = { 3740 /* 3741 * no elements => accept any params 3742 * validation will happen later 3743 */ 3744 { /* end of list */ } 3745 }, 3746 }; 3747