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/qdict.h" 39 #include "block/throttle-groups.h" 40 #include "monitor/monitor.h" 41 #include "qemu/error-report.h" 42 #include "qemu/option.h" 43 #include "qemu/qemu-print.h" 44 #include "qemu/config-file.h" 45 #include "qapi/qapi-commands-block.h" 46 #include "qapi/qapi-commands-transaction.h" 47 #include "qapi/qapi-visit-block-core.h" 48 #include "qapi/qmp/qdict.h" 49 #include "qapi/qmp/qnum.h" 50 #include "qapi/qmp/qstring.h" 51 #include "qapi/error.h" 52 #include "qapi/qmp/qerror.h" 53 #include "qapi/qmp/qlist.h" 54 #include "qapi/qobject-output-visitor.h" 55 #include "sysemu/sysemu.h" 56 #include "sysemu/iothread.h" 57 #include "block/block_int.h" 58 #include "block/trace.h" 59 #include "sysemu/arch_init.h" 60 #include "sysemu/qtest.h" 61 #include "sysemu/runstate.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 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 68 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 69 70 static int do_open_tray(const char *blk_name, const char *qdev_id, 71 bool force, Error **errp); 72 static void blockdev_remove_medium(bool has_device, const char *device, 73 bool has_id, const char *id, Error **errp); 74 static void blockdev_insert_medium(bool has_device, const char *device, 75 bool has_id, const char *id, 76 const char *node_name, Error **errp); 77 78 static const char *const if_name[IF_COUNT] = { 79 [IF_NONE] = "none", 80 [IF_IDE] = "ide", 81 [IF_SCSI] = "scsi", 82 [IF_FLOPPY] = "floppy", 83 [IF_PFLASH] = "pflash", 84 [IF_MTD] = "mtd", 85 [IF_SD] = "sd", 86 [IF_VIRTIO] = "virtio", 87 [IF_XEN] = "xen", 88 }; 89 90 static int if_max_devs[IF_COUNT] = { 91 /* 92 * Do not change these numbers! They govern how drive option 93 * index maps to unit and bus. That mapping is ABI. 94 * 95 * All controllers used to implement if=T drives need to support 96 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 97 * Otherwise, some index values map to "impossible" bus, unit 98 * values. 99 * 100 * For instance, if you change [IF_SCSI] to 255, -drive 101 * if=scsi,index=12 no longer means bus=1,unit=5, but 102 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 103 * the drive can't be set up. Regression. 104 */ 105 [IF_IDE] = 2, 106 [IF_SCSI] = 7, 107 }; 108 109 /** 110 * Boards may call this to offer board-by-board overrides 111 * of the default, global values. 112 */ 113 void override_max_devs(BlockInterfaceType type, int max_devs) 114 { 115 BlockBackend *blk; 116 DriveInfo *dinfo; 117 118 if (max_devs <= 0) { 119 return; 120 } 121 122 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 123 dinfo = blk_legacy_dinfo(blk); 124 if (dinfo->type == type) { 125 fprintf(stderr, "Cannot override units-per-bus property of" 126 " the %s interface, because a drive of that type has" 127 " already been added.\n", if_name[type]); 128 g_assert_not_reached(); 129 } 130 } 131 132 if_max_devs[type] = max_devs; 133 } 134 135 /* 136 * We automatically delete the drive when a device using it gets 137 * unplugged. Questionable feature, but we can't just drop it. 138 * Device models call blockdev_mark_auto_del() to schedule the 139 * automatic deletion, and generic qdev code calls blockdev_auto_del() 140 * when deletion is actually safe. 141 */ 142 void blockdev_mark_auto_del(BlockBackend *blk) 143 { 144 DriveInfo *dinfo = blk_legacy_dinfo(blk); 145 BlockJob *job; 146 147 if (!dinfo) { 148 return; 149 } 150 151 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 152 if (block_job_has_bdrv(job, blk_bs(blk))) { 153 AioContext *aio_context = job->job.aio_context; 154 aio_context_acquire(aio_context); 155 156 job_cancel(&job->job, false); 157 158 aio_context_release(aio_context); 159 } 160 } 161 162 dinfo->auto_del = 1; 163 } 164 165 void blockdev_auto_del(BlockBackend *blk) 166 { 167 DriveInfo *dinfo = blk_legacy_dinfo(blk); 168 169 if (dinfo && dinfo->auto_del) { 170 monitor_remove_blk(blk); 171 blk_unref(blk); 172 } 173 } 174 175 /** 176 * Returns the current mapping of how many units per bus 177 * a particular interface can support. 178 * 179 * A positive integer indicates n units per bus. 180 * 0 implies the mapping has not been established. 181 * -1 indicates an invalid BlockInterfaceType was given. 182 */ 183 int drive_get_max_devs(BlockInterfaceType type) 184 { 185 if (type >= IF_IDE && type < IF_COUNT) { 186 return if_max_devs[type]; 187 } 188 189 return -1; 190 } 191 192 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 193 { 194 int max_devs = if_max_devs[type]; 195 return max_devs ? index / max_devs : 0; 196 } 197 198 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 199 { 200 int max_devs = if_max_devs[type]; 201 return max_devs ? index % max_devs : index; 202 } 203 204 QemuOpts *drive_def(const char *optstr) 205 { 206 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 207 } 208 209 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 210 const char *optstr) 211 { 212 QemuOpts *opts; 213 214 opts = drive_def(optstr); 215 if (!opts) { 216 return NULL; 217 } 218 if (type != IF_DEFAULT) { 219 qemu_opt_set(opts, "if", if_name[type], &error_abort); 220 } 221 if (index >= 0) { 222 qemu_opt_set_number(opts, "index", index, &error_abort); 223 } 224 if (file) 225 qemu_opt_set(opts, "file", file, &error_abort); 226 return opts; 227 } 228 229 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 230 { 231 BlockBackend *blk; 232 DriveInfo *dinfo; 233 234 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 235 dinfo = blk_legacy_dinfo(blk); 236 if (dinfo && dinfo->type == type 237 && dinfo->bus == bus && dinfo->unit == unit) { 238 return dinfo; 239 } 240 } 241 242 return NULL; 243 } 244 245 void drive_check_orphaned(void) 246 { 247 BlockBackend *blk; 248 DriveInfo *dinfo; 249 Location loc; 250 bool orphans = false; 251 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 255 dinfo->type != IF_NONE) { 256 loc_push_none(&loc); 257 qemu_opts_loc_restore(dinfo->opts); 258 error_report("machine type does not support" 259 " if=%s,bus=%d,unit=%d", 260 if_name[dinfo->type], dinfo->bus, dinfo->unit); 261 loc_pop(&loc); 262 orphans = true; 263 } 264 } 265 266 if (orphans) { 267 exit(1); 268 } 269 } 270 271 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 272 { 273 return drive_get(type, 274 drive_index_to_bus_id(type, index), 275 drive_index_to_unit_id(type, index)); 276 } 277 278 int drive_get_max_bus(BlockInterfaceType type) 279 { 280 int max_bus; 281 BlockBackend *blk; 282 DriveInfo *dinfo; 283 284 max_bus = -1; 285 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 286 dinfo = blk_legacy_dinfo(blk); 287 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 288 max_bus = dinfo->bus; 289 } 290 } 291 return max_bus; 292 } 293 294 /* Get a block device. This should only be used for single-drive devices 295 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 296 appropriate bus. */ 297 DriveInfo *drive_get_next(BlockInterfaceType type) 298 { 299 static int next_block_unit[IF_COUNT]; 300 301 return drive_get(type, 0, next_block_unit[type]++); 302 } 303 304 static void bdrv_format_print(void *opaque, const char *name) 305 { 306 qemu_printf(" %s", name); 307 } 308 309 typedef struct { 310 QEMUBH *bh; 311 BlockDriverState *bs; 312 } BDRVPutRefBH; 313 314 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 315 { 316 if (!strcmp(buf, "ignore")) { 317 return BLOCKDEV_ON_ERROR_IGNORE; 318 } else if (!is_read && !strcmp(buf, "enospc")) { 319 return BLOCKDEV_ON_ERROR_ENOSPC; 320 } else if (!strcmp(buf, "stop")) { 321 return BLOCKDEV_ON_ERROR_STOP; 322 } else if (!strcmp(buf, "report")) { 323 return BLOCKDEV_ON_ERROR_REPORT; 324 } else { 325 error_setg(errp, "'%s' invalid %s error action", 326 buf, is_read ? "read" : "write"); 327 return -1; 328 } 329 } 330 331 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 332 Error **errp) 333 { 334 const QListEntry *entry; 335 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 336 switch (qobject_type(entry->value)) { 337 338 case QTYPE_QSTRING: { 339 unsigned long long length; 340 const char *str = qstring_get_str(qobject_to(QString, 341 entry->value)); 342 if (parse_uint_full(str, &length, 10) == 0 && 343 length > 0 && length <= UINT_MAX) { 344 block_acct_add_interval(stats, (unsigned) length); 345 } else { 346 error_setg(errp, "Invalid interval length: %s", str); 347 return false; 348 } 349 break; 350 } 351 352 case QTYPE_QNUM: { 353 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 354 355 if (length > 0 && length <= UINT_MAX) { 356 block_acct_add_interval(stats, (unsigned) length); 357 } else { 358 error_setg(errp, "Invalid interval length: %" PRId64, length); 359 return false; 360 } 361 break; 362 } 363 364 default: 365 error_setg(errp, "The specification of stats-intervals is invalid"); 366 return false; 367 } 368 } 369 return true; 370 } 371 372 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 373 374 /* All parameters but @opts are optional and may be set to NULL. */ 375 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 376 const char **throttling_group, ThrottleConfig *throttle_cfg, 377 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 378 { 379 Error *local_error = NULL; 380 const char *aio; 381 382 if (bdrv_flags) { 383 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 384 *bdrv_flags |= BDRV_O_COPY_ON_READ; 385 } 386 387 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 388 if (!strcmp(aio, "native")) { 389 *bdrv_flags |= BDRV_O_NATIVE_AIO; 390 } else if (!strcmp(aio, "threads")) { 391 /* this is the default */ 392 } else { 393 error_setg(errp, "invalid aio option"); 394 return; 395 } 396 } 397 } 398 399 /* disk I/O throttling */ 400 if (throttling_group) { 401 *throttling_group = qemu_opt_get(opts, "throttling.group"); 402 } 403 404 if (throttle_cfg) { 405 throttle_config_init(throttle_cfg); 406 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 407 qemu_opt_get_number(opts, "throttling.bps-total", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 409 qemu_opt_get_number(opts, "throttling.bps-read", 0); 410 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 411 qemu_opt_get_number(opts, "throttling.bps-write", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 413 qemu_opt_get_number(opts, "throttling.iops-total", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 415 qemu_opt_get_number(opts, "throttling.iops-read", 0); 416 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 417 qemu_opt_get_number(opts, "throttling.iops-write", 0); 418 419 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 420 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 421 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 422 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 423 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 424 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 425 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 426 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 427 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 428 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 429 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 430 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 431 432 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 433 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 434 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 435 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 436 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 437 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 438 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 439 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 440 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 441 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 442 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 443 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 444 445 throttle_cfg->op_size = 446 qemu_opt_get_number(opts, "throttling.iops-size", 0); 447 448 if (!throttle_is_valid(throttle_cfg, errp)) { 449 return; 450 } 451 } 452 453 if (detect_zeroes) { 454 *detect_zeroes = 455 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 456 qemu_opt_get(opts, "detect-zeroes"), 457 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 458 &local_error); 459 if (local_error) { 460 error_propagate(errp, local_error); 461 return; 462 } 463 } 464 } 465 466 /* Takes the ownership of bs_opts */ 467 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 468 Error **errp) 469 { 470 const char *buf; 471 int bdrv_flags = 0; 472 int on_read_error, on_write_error; 473 bool account_invalid, account_failed; 474 bool writethrough, read_only; 475 BlockBackend *blk; 476 BlockDriverState *bs; 477 ThrottleConfig cfg; 478 int snapshot = 0; 479 Error *error = NULL; 480 QemuOpts *opts; 481 QDict *interval_dict = NULL; 482 QList *interval_list = NULL; 483 const char *id; 484 BlockdevDetectZeroesOptions detect_zeroes = 485 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 486 const char *throttling_group = NULL; 487 488 /* Check common options by copying from bs_opts to opts, all other options 489 * stay in bs_opts for processing by bdrv_open(). */ 490 id = qdict_get_try_str(bs_opts, "id"); 491 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 492 if (error) { 493 error_propagate(errp, error); 494 goto err_no_opts; 495 } 496 497 qemu_opts_absorb_qdict(opts, bs_opts, &error); 498 if (error) { 499 error_propagate(errp, error); 500 goto early_err; 501 } 502 503 if (id) { 504 qdict_del(bs_opts, "id"); 505 } 506 507 /* extract parameters */ 508 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 509 510 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 511 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 512 513 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 514 515 id = qemu_opts_id(opts); 516 517 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 518 qdict_array_split(interval_dict, &interval_list); 519 520 if (qdict_size(interval_dict) != 0) { 521 error_setg(errp, "Invalid option stats-intervals.%s", 522 qdict_first(interval_dict)->key); 523 goto early_err; 524 } 525 526 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 527 &detect_zeroes, &error); 528 if (error) { 529 error_propagate(errp, error); 530 goto early_err; 531 } 532 533 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 534 if (is_help_option(buf)) { 535 qemu_printf("Supported formats:"); 536 bdrv_iterate_format(bdrv_format_print, NULL, false); 537 qemu_printf("\nSupported formats (read-only):"); 538 bdrv_iterate_format(bdrv_format_print, NULL, true); 539 qemu_printf("\n"); 540 goto early_err; 541 } 542 543 if (qdict_haskey(bs_opts, "driver")) { 544 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 545 goto early_err; 546 } 547 qdict_put_str(bs_opts, "driver", buf); 548 } 549 550 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 551 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 552 on_write_error = parse_block_error_action(buf, 0, &error); 553 if (error) { 554 error_propagate(errp, error); 555 goto early_err; 556 } 557 } 558 559 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 560 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 561 on_read_error = parse_block_error_action(buf, 1, &error); 562 if (error) { 563 error_propagate(errp, error); 564 goto early_err; 565 } 566 } 567 568 if (snapshot) { 569 bdrv_flags |= BDRV_O_SNAPSHOT; 570 } 571 572 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 573 574 /* init */ 575 if ((!file || !*file) && !qdict_size(bs_opts)) { 576 BlockBackendRootState *blk_rs; 577 578 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 579 blk_rs = blk_get_root_state(blk); 580 blk_rs->open_flags = bdrv_flags; 581 blk_rs->read_only = read_only; 582 blk_rs->detect_zeroes = detect_zeroes; 583 584 qobject_unref(bs_opts); 585 } else { 586 if (file && !*file) { 587 file = NULL; 588 } 589 590 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 591 * with other callers) rather than what we want as the real defaults. 592 * Apply the defaults here instead. */ 593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 594 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 595 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 596 read_only ? "on" : "off"); 597 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 598 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 599 600 if (runstate_check(RUN_STATE_INMIGRATE)) { 601 bdrv_flags |= BDRV_O_INACTIVE; 602 } 603 604 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 605 if (!blk) { 606 goto err_no_bs_opts; 607 } 608 bs = blk_bs(blk); 609 610 bs->detect_zeroes = detect_zeroes; 611 612 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 613 614 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 615 blk_unref(blk); 616 blk = NULL; 617 goto err_no_bs_opts; 618 } 619 } 620 621 /* disk I/O throttling */ 622 if (throttle_enabled(&cfg)) { 623 if (!throttling_group) { 624 throttling_group = id; 625 } 626 blk_io_limits_enable(blk, throttling_group); 627 blk_set_io_limits(blk, &cfg); 628 } 629 630 blk_set_enable_write_cache(blk, !writethrough); 631 blk_set_on_error(blk, on_read_error, on_write_error); 632 633 if (!monitor_add_blk(blk, id, errp)) { 634 blk_unref(blk); 635 blk = NULL; 636 goto err_no_bs_opts; 637 } 638 639 err_no_bs_opts: 640 qemu_opts_del(opts); 641 qobject_unref(interval_dict); 642 qobject_unref(interval_list); 643 return blk; 644 645 early_err: 646 qemu_opts_del(opts); 647 qobject_unref(interval_dict); 648 qobject_unref(interval_list); 649 err_no_opts: 650 qobject_unref(bs_opts); 651 return NULL; 652 } 653 654 /* Takes the ownership of bs_opts */ 655 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 656 { 657 int bdrv_flags = 0; 658 659 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 660 * with other callers) rather than what we want as the real defaults. 661 * Apply the defaults here instead. */ 662 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 663 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 664 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 665 666 if (runstate_check(RUN_STATE_INMIGRATE)) { 667 bdrv_flags |= BDRV_O_INACTIVE; 668 } 669 670 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 671 } 672 673 void blockdev_close_all_bdrv_states(void) 674 { 675 BlockDriverState *bs, *next_bs; 676 677 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 678 AioContext *ctx = bdrv_get_aio_context(bs); 679 680 aio_context_acquire(ctx); 681 bdrv_unref(bs); 682 aio_context_release(ctx); 683 } 684 } 685 686 /* Iterates over the list of monitor-owned BlockDriverStates */ 687 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 688 { 689 return bs ? QTAILQ_NEXT(bs, monitor_list) 690 : QTAILQ_FIRST(&monitor_bdrv_states); 691 } 692 693 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 694 Error **errp) 695 { 696 const char *value; 697 698 value = qemu_opt_get(opts, from); 699 if (value) { 700 if (qemu_opt_find(opts, to)) { 701 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 702 "same time", to, from); 703 return; 704 } 705 } 706 707 /* rename all items in opts */ 708 while ((value = qemu_opt_get(opts, from))) { 709 qemu_opt_set(opts, to, value, &error_abort); 710 qemu_opt_unset(opts, from); 711 } 712 } 713 714 QemuOptsList qemu_legacy_drive_opts = { 715 .name = "drive", 716 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 717 .desc = { 718 { 719 .name = "bus", 720 .type = QEMU_OPT_NUMBER, 721 .help = "bus number", 722 },{ 723 .name = "unit", 724 .type = QEMU_OPT_NUMBER, 725 .help = "unit number (i.e. lun for scsi)", 726 },{ 727 .name = "index", 728 .type = QEMU_OPT_NUMBER, 729 .help = "index number", 730 },{ 731 .name = "media", 732 .type = QEMU_OPT_STRING, 733 .help = "media type (disk, cdrom)", 734 },{ 735 .name = "if", 736 .type = QEMU_OPT_STRING, 737 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 738 },{ 739 .name = "file", 740 .type = QEMU_OPT_STRING, 741 .help = "file name", 742 }, 743 744 /* Options that are passed on, but have special semantics with -drive */ 745 { 746 .name = BDRV_OPT_READ_ONLY, 747 .type = QEMU_OPT_BOOL, 748 .help = "open drive file as read-only", 749 },{ 750 .name = "rerror", 751 .type = QEMU_OPT_STRING, 752 .help = "read error action", 753 },{ 754 .name = "werror", 755 .type = QEMU_OPT_STRING, 756 .help = "write error action", 757 },{ 758 .name = "copy-on-read", 759 .type = QEMU_OPT_BOOL, 760 .help = "copy read data from backing file into image file", 761 }, 762 763 { /* end of list */ } 764 }, 765 }; 766 767 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 768 Error **errp) 769 { 770 const char *value; 771 BlockBackend *blk; 772 DriveInfo *dinfo = NULL; 773 QDict *bs_opts; 774 QemuOpts *legacy_opts; 775 DriveMediaType media = MEDIA_DISK; 776 BlockInterfaceType type; 777 int max_devs, bus_id, unit_id, index; 778 const char *werror, *rerror; 779 bool read_only = false; 780 bool copy_on_read; 781 const char *filename; 782 Error *local_err = NULL; 783 int i; 784 785 /* Change legacy command line options into QMP ones */ 786 static const struct { 787 const char *from; 788 const char *to; 789 } opt_renames[] = { 790 { "iops", "throttling.iops-total" }, 791 { "iops_rd", "throttling.iops-read" }, 792 { "iops_wr", "throttling.iops-write" }, 793 794 { "bps", "throttling.bps-total" }, 795 { "bps_rd", "throttling.bps-read" }, 796 { "bps_wr", "throttling.bps-write" }, 797 798 { "iops_max", "throttling.iops-total-max" }, 799 { "iops_rd_max", "throttling.iops-read-max" }, 800 { "iops_wr_max", "throttling.iops-write-max" }, 801 802 { "bps_max", "throttling.bps-total-max" }, 803 { "bps_rd_max", "throttling.bps-read-max" }, 804 { "bps_wr_max", "throttling.bps-write-max" }, 805 806 { "iops_size", "throttling.iops-size" }, 807 808 { "group", "throttling.group" }, 809 810 { "readonly", BDRV_OPT_READ_ONLY }, 811 }; 812 813 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 814 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 815 &local_err); 816 if (local_err) { 817 error_propagate(errp, local_err); 818 return NULL; 819 } 820 } 821 822 value = qemu_opt_get(all_opts, "cache"); 823 if (value) { 824 int flags = 0; 825 bool writethrough; 826 827 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 828 error_setg(errp, "invalid cache option"); 829 return NULL; 830 } 831 832 /* Specific options take precedence */ 833 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 834 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 835 !writethrough, &error_abort); 836 } 837 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 838 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 839 !!(flags & BDRV_O_NOCACHE), &error_abort); 840 } 841 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 842 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 843 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 844 } 845 qemu_opt_unset(all_opts, "cache"); 846 } 847 848 /* Get a QDict for processing the options */ 849 bs_opts = qdict_new(); 850 qemu_opts_to_qdict(all_opts, bs_opts); 851 852 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 853 &error_abort); 854 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 855 if (local_err) { 856 error_propagate(errp, local_err); 857 goto fail; 858 } 859 860 /* Media type */ 861 value = qemu_opt_get(legacy_opts, "media"); 862 if (value) { 863 if (!strcmp(value, "disk")) { 864 media = MEDIA_DISK; 865 } else if (!strcmp(value, "cdrom")) { 866 media = MEDIA_CDROM; 867 read_only = true; 868 } else { 869 error_setg(errp, "'%s' invalid media", value); 870 goto fail; 871 } 872 } 873 874 /* copy-on-read is disabled with a warning for read-only devices */ 875 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 876 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 877 878 if (read_only && copy_on_read) { 879 warn_report("disabling copy-on-read on read-only drive"); 880 copy_on_read = false; 881 } 882 883 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 884 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 885 886 /* Controller type */ 887 value = qemu_opt_get(legacy_opts, "if"); 888 if (value) { 889 for (type = 0; 890 type < IF_COUNT && strcmp(value, if_name[type]); 891 type++) { 892 } 893 if (type == IF_COUNT) { 894 error_setg(errp, "unsupported bus type '%s'", value); 895 goto fail; 896 } 897 } else { 898 type = block_default_type; 899 } 900 901 /* Device address specified by bus/unit or index. 902 * If none was specified, try to find the first free one. */ 903 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 904 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 905 index = qemu_opt_get_number(legacy_opts, "index", -1); 906 907 max_devs = if_max_devs[type]; 908 909 if (index != -1) { 910 if (bus_id != 0 || unit_id != -1) { 911 error_setg(errp, "index cannot be used with bus and unit"); 912 goto fail; 913 } 914 bus_id = drive_index_to_bus_id(type, index); 915 unit_id = drive_index_to_unit_id(type, index); 916 } 917 918 if (unit_id == -1) { 919 unit_id = 0; 920 while (drive_get(type, bus_id, unit_id) != NULL) { 921 unit_id++; 922 if (max_devs && unit_id >= max_devs) { 923 unit_id -= max_devs; 924 bus_id++; 925 } 926 } 927 } 928 929 if (max_devs && unit_id >= max_devs) { 930 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 931 goto fail; 932 } 933 934 if (drive_get(type, bus_id, unit_id) != NULL) { 935 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 936 bus_id, unit_id, index); 937 goto fail; 938 } 939 940 /* no id supplied -> create one */ 941 if (qemu_opts_id(all_opts) == NULL) { 942 char *new_id; 943 const char *mediastr = ""; 944 if (type == IF_IDE || type == IF_SCSI) { 945 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 946 } 947 if (max_devs) { 948 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 949 mediastr, unit_id); 950 } else { 951 new_id = g_strdup_printf("%s%s%i", if_name[type], 952 mediastr, unit_id); 953 } 954 qdict_put_str(bs_opts, "id", new_id); 955 g_free(new_id); 956 } 957 958 /* Add virtio block device */ 959 if (type == IF_VIRTIO) { 960 QemuOpts *devopts; 961 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 962 &error_abort); 963 if (arch_type == QEMU_ARCH_S390X) { 964 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 965 } else { 966 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 967 } 968 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 969 &error_abort); 970 } 971 972 filename = qemu_opt_get(legacy_opts, "file"); 973 974 /* Check werror/rerror compatibility with if=... */ 975 werror = qemu_opt_get(legacy_opts, "werror"); 976 if (werror != NULL) { 977 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 978 type != IF_NONE) { 979 error_setg(errp, "werror is not supported by this bus type"); 980 goto fail; 981 } 982 qdict_put_str(bs_opts, "werror", werror); 983 } 984 985 rerror = qemu_opt_get(legacy_opts, "rerror"); 986 if (rerror != NULL) { 987 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 988 type != IF_NONE) { 989 error_setg(errp, "rerror is not supported by this bus type"); 990 goto fail; 991 } 992 qdict_put_str(bs_opts, "rerror", rerror); 993 } 994 995 /* Actual block device init: Functionality shared with blockdev-add */ 996 blk = blockdev_init(filename, bs_opts, &local_err); 997 bs_opts = NULL; 998 if (!blk) { 999 error_propagate(errp, local_err); 1000 goto fail; 1001 } else { 1002 assert(!local_err); 1003 } 1004 1005 /* Create legacy DriveInfo */ 1006 dinfo = g_malloc0(sizeof(*dinfo)); 1007 dinfo->opts = all_opts; 1008 1009 dinfo->type = type; 1010 dinfo->bus = bus_id; 1011 dinfo->unit = unit_id; 1012 1013 blk_set_legacy_dinfo(blk, dinfo); 1014 1015 switch(type) { 1016 case IF_IDE: 1017 case IF_SCSI: 1018 case IF_XEN: 1019 case IF_NONE: 1020 dinfo->media_cd = media == MEDIA_CDROM; 1021 break; 1022 default: 1023 break; 1024 } 1025 1026 fail: 1027 qemu_opts_del(legacy_opts); 1028 qobject_unref(bs_opts); 1029 return dinfo; 1030 } 1031 1032 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1033 { 1034 BlockDriverState *bs; 1035 1036 bs = bdrv_lookup_bs(name, name, errp); 1037 if (bs == NULL) { 1038 return NULL; 1039 } 1040 1041 if (!bdrv_is_root_node(bs)) { 1042 error_setg(errp, "Need a root block node"); 1043 return NULL; 1044 } 1045 1046 if (!bdrv_is_inserted(bs)) { 1047 error_setg(errp, "Device has no medium"); 1048 return NULL; 1049 } 1050 1051 return bs; 1052 } 1053 1054 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1055 Error **errp) 1056 { 1057 BlockBackend *blk; 1058 1059 if (!blk_name == !qdev_id) { 1060 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1061 return NULL; 1062 } 1063 1064 if (qdev_id) { 1065 blk = blk_by_qdev_id(qdev_id, errp); 1066 } else { 1067 blk = blk_by_name(blk_name); 1068 if (blk == NULL) { 1069 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1070 "Device '%s' not found", blk_name); 1071 } 1072 } 1073 1074 return blk; 1075 } 1076 1077 void hmp_commit(Monitor *mon, const QDict *qdict) 1078 { 1079 const char *device = qdict_get_str(qdict, "device"); 1080 BlockBackend *blk; 1081 int ret; 1082 1083 if (!strcmp(device, "all")) { 1084 ret = blk_commit_all(); 1085 } else { 1086 BlockDriverState *bs; 1087 AioContext *aio_context; 1088 1089 blk = blk_by_name(device); 1090 if (!blk) { 1091 monitor_printf(mon, "Device '%s' not found\n", device); 1092 return; 1093 } 1094 if (!blk_is_available(blk)) { 1095 monitor_printf(mon, "Device '%s' has no medium\n", device); 1096 return; 1097 } 1098 1099 bs = blk_bs(blk); 1100 aio_context = bdrv_get_aio_context(bs); 1101 aio_context_acquire(aio_context); 1102 1103 ret = bdrv_commit(bs); 1104 1105 aio_context_release(aio_context); 1106 } 1107 if (ret < 0) { 1108 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1109 strerror(-ret)); 1110 } 1111 } 1112 1113 static void blockdev_do_action(TransactionAction *action, Error **errp) 1114 { 1115 TransactionActionList list; 1116 1117 list.value = action; 1118 list.next = NULL; 1119 qmp_transaction(&list, false, NULL, errp); 1120 } 1121 1122 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1123 bool has_node_name, const char *node_name, 1124 const char *snapshot_file, 1125 bool has_snapshot_node_name, 1126 const char *snapshot_node_name, 1127 bool has_format, const char *format, 1128 bool has_mode, NewImageMode mode, Error **errp) 1129 { 1130 BlockdevSnapshotSync snapshot = { 1131 .has_device = has_device, 1132 .device = (char *) device, 1133 .has_node_name = has_node_name, 1134 .node_name = (char *) node_name, 1135 .snapshot_file = (char *) snapshot_file, 1136 .has_snapshot_node_name = has_snapshot_node_name, 1137 .snapshot_node_name = (char *) snapshot_node_name, 1138 .has_format = has_format, 1139 .format = (char *) format, 1140 .has_mode = has_mode, 1141 .mode = mode, 1142 }; 1143 TransactionAction action = { 1144 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1145 .u.blockdev_snapshot_sync.data = &snapshot, 1146 }; 1147 blockdev_do_action(&action, errp); 1148 } 1149 1150 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1151 Error **errp) 1152 { 1153 BlockdevSnapshot snapshot_data = { 1154 .node = (char *) node, 1155 .overlay = (char *) overlay 1156 }; 1157 TransactionAction action = { 1158 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1159 .u.blockdev_snapshot.data = &snapshot_data, 1160 }; 1161 blockdev_do_action(&action, errp); 1162 } 1163 1164 void qmp_blockdev_snapshot_internal_sync(const char *device, 1165 const char *name, 1166 Error **errp) 1167 { 1168 BlockdevSnapshotInternal snapshot = { 1169 .device = (char *) device, 1170 .name = (char *) name 1171 }; 1172 TransactionAction action = { 1173 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1174 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1175 }; 1176 blockdev_do_action(&action, errp); 1177 } 1178 1179 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1180 bool has_id, 1181 const char *id, 1182 bool has_name, 1183 const char *name, 1184 Error **errp) 1185 { 1186 BlockDriverState *bs; 1187 AioContext *aio_context; 1188 QEMUSnapshotInfo sn; 1189 Error *local_err = NULL; 1190 SnapshotInfo *info = NULL; 1191 int ret; 1192 1193 bs = qmp_get_root_bs(device, errp); 1194 if (!bs) { 1195 return NULL; 1196 } 1197 aio_context = bdrv_get_aio_context(bs); 1198 aio_context_acquire(aio_context); 1199 1200 if (!has_id) { 1201 id = NULL; 1202 } 1203 1204 if (!has_name) { 1205 name = NULL; 1206 } 1207 1208 if (!id && !name) { 1209 error_setg(errp, "Name or id must be provided"); 1210 goto out_aio_context; 1211 } 1212 1213 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1214 goto out_aio_context; 1215 } 1216 1217 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1218 if (local_err) { 1219 error_propagate(errp, local_err); 1220 goto out_aio_context; 1221 } 1222 if (!ret) { 1223 error_setg(errp, 1224 "Snapshot with id '%s' and name '%s' does not exist on " 1225 "device '%s'", 1226 STR_OR_NULL(id), STR_OR_NULL(name), device); 1227 goto out_aio_context; 1228 } 1229 1230 bdrv_snapshot_delete(bs, id, name, &local_err); 1231 if (local_err) { 1232 error_propagate(errp, local_err); 1233 goto out_aio_context; 1234 } 1235 1236 aio_context_release(aio_context); 1237 1238 info = g_new0(SnapshotInfo, 1); 1239 info->id = g_strdup(sn.id_str); 1240 info->name = g_strdup(sn.name); 1241 info->date_nsec = sn.date_nsec; 1242 info->date_sec = sn.date_sec; 1243 info->vm_state_size = sn.vm_state_size; 1244 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1245 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1246 1247 return info; 1248 1249 out_aio_context: 1250 aio_context_release(aio_context); 1251 return NULL; 1252 } 1253 1254 /** 1255 * block_dirty_bitmap_lookup: 1256 * Return a dirty bitmap (if present), after validating 1257 * the node reference and bitmap names. 1258 * 1259 * @node: The name of the BDS node to search for bitmaps 1260 * @name: The name of the bitmap to search for 1261 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1262 * @errp: Output pointer for error information. Can be NULL. 1263 * 1264 * @return: A bitmap object on success, or NULL on failure. 1265 */ 1266 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1267 const char *name, 1268 BlockDriverState **pbs, 1269 Error **errp) 1270 { 1271 BlockDriverState *bs; 1272 BdrvDirtyBitmap *bitmap; 1273 1274 if (!node) { 1275 error_setg(errp, "Node cannot be NULL"); 1276 return NULL; 1277 } 1278 if (!name) { 1279 error_setg(errp, "Bitmap name cannot be NULL"); 1280 return NULL; 1281 } 1282 bs = bdrv_lookup_bs(node, node, NULL); 1283 if (!bs) { 1284 error_setg(errp, "Node '%s' not found", node); 1285 return NULL; 1286 } 1287 1288 bitmap = bdrv_find_dirty_bitmap(bs, name); 1289 if (!bitmap) { 1290 error_setg(errp, "Dirty bitmap '%s' not found", name); 1291 return NULL; 1292 } 1293 1294 if (pbs) { 1295 *pbs = bs; 1296 } 1297 1298 return bitmap; 1299 } 1300 1301 /* New and old BlockDriverState structs for atomic group operations */ 1302 1303 typedef struct BlkActionState BlkActionState; 1304 1305 /** 1306 * BlkActionOps: 1307 * Table of operations that define an Action. 1308 * 1309 * @instance_size: Size of state struct, in bytes. 1310 * @prepare: Prepare the work, must NOT be NULL. 1311 * @commit: Commit the changes, can be NULL. 1312 * @abort: Abort the changes on fail, can be NULL. 1313 * @clean: Clean up resources after all transaction actions have called 1314 * commit() or abort(). Can be NULL. 1315 * 1316 * Only prepare() may fail. In a single transaction, only one of commit() or 1317 * abort() will be called. clean() will always be called if it is present. 1318 */ 1319 typedef struct BlkActionOps { 1320 size_t instance_size; 1321 void (*prepare)(BlkActionState *common, Error **errp); 1322 void (*commit)(BlkActionState *common); 1323 void (*abort)(BlkActionState *common); 1324 void (*clean)(BlkActionState *common); 1325 } BlkActionOps; 1326 1327 /** 1328 * BlkActionState: 1329 * Describes one Action's state within a Transaction. 1330 * 1331 * @action: QAPI-defined enum identifying which Action to perform. 1332 * @ops: Table of ActionOps this Action can perform. 1333 * @block_job_txn: Transaction which this action belongs to. 1334 * @entry: List membership for all Actions in this Transaction. 1335 * 1336 * This structure must be arranged as first member in a subclassed type, 1337 * assuming that the compiler will also arrange it to the same offsets as the 1338 * base class. 1339 */ 1340 struct BlkActionState { 1341 TransactionAction *action; 1342 const BlkActionOps *ops; 1343 JobTxn *block_job_txn; 1344 TransactionProperties *txn_props; 1345 QTAILQ_ENTRY(BlkActionState) entry; 1346 }; 1347 1348 /* internal snapshot private data */ 1349 typedef struct InternalSnapshotState { 1350 BlkActionState common; 1351 BlockDriverState *bs; 1352 QEMUSnapshotInfo sn; 1353 bool created; 1354 } InternalSnapshotState; 1355 1356 1357 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1358 { 1359 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1360 error_setg(errp, 1361 "Action '%s' does not support Transaction property " 1362 "completion-mode = %s", 1363 TransactionActionKind_str(s->action->type), 1364 ActionCompletionMode_str(s->txn_props->completion_mode)); 1365 return -1; 1366 } 1367 return 0; 1368 } 1369 1370 static void internal_snapshot_prepare(BlkActionState *common, 1371 Error **errp) 1372 { 1373 Error *local_err = NULL; 1374 const char *device; 1375 const char *name; 1376 BlockDriverState *bs; 1377 QEMUSnapshotInfo old_sn, *sn; 1378 bool ret; 1379 qemu_timeval tv; 1380 BlockdevSnapshotInternal *internal; 1381 InternalSnapshotState *state; 1382 AioContext *aio_context; 1383 int ret1; 1384 1385 g_assert(common->action->type == 1386 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1387 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1388 state = DO_UPCAST(InternalSnapshotState, common, common); 1389 1390 /* 1. parse input */ 1391 device = internal->device; 1392 name = internal->name; 1393 1394 /* 2. check for validation */ 1395 if (action_check_completion_mode(common, errp) < 0) { 1396 return; 1397 } 1398 1399 bs = qmp_get_root_bs(device, errp); 1400 if (!bs) { 1401 return; 1402 } 1403 1404 aio_context = bdrv_get_aio_context(bs); 1405 aio_context_acquire(aio_context); 1406 1407 state->bs = bs; 1408 1409 /* Paired with .clean() */ 1410 bdrv_drained_begin(bs); 1411 1412 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1413 goto out; 1414 } 1415 1416 if (bdrv_is_read_only(bs)) { 1417 error_setg(errp, "Device '%s' is read only", device); 1418 goto out; 1419 } 1420 1421 if (!bdrv_can_snapshot(bs)) { 1422 error_setg(errp, "Block format '%s' used by device '%s' " 1423 "does not support internal snapshots", 1424 bs->drv->format_name, device); 1425 goto out; 1426 } 1427 1428 if (!strlen(name)) { 1429 error_setg(errp, "Name is empty"); 1430 goto out; 1431 } 1432 1433 /* check whether a snapshot with name exist */ 1434 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1435 &local_err); 1436 if (local_err) { 1437 error_propagate(errp, local_err); 1438 goto out; 1439 } else if (ret) { 1440 error_setg(errp, 1441 "Snapshot with name '%s' already exists on device '%s'", 1442 name, device); 1443 goto out; 1444 } 1445 1446 /* 3. take the snapshot */ 1447 sn = &state->sn; 1448 pstrcpy(sn->name, sizeof(sn->name), name); 1449 qemu_gettimeofday(&tv); 1450 sn->date_sec = tv.tv_sec; 1451 sn->date_nsec = tv.tv_usec * 1000; 1452 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1453 1454 ret1 = bdrv_snapshot_create(bs, sn); 1455 if (ret1 < 0) { 1456 error_setg_errno(errp, -ret1, 1457 "Failed to create snapshot '%s' on device '%s'", 1458 name, device); 1459 goto out; 1460 } 1461 1462 /* 4. succeed, mark a snapshot is created */ 1463 state->created = true; 1464 1465 out: 1466 aio_context_release(aio_context); 1467 } 1468 1469 static void internal_snapshot_abort(BlkActionState *common) 1470 { 1471 InternalSnapshotState *state = 1472 DO_UPCAST(InternalSnapshotState, common, common); 1473 BlockDriverState *bs = state->bs; 1474 QEMUSnapshotInfo *sn = &state->sn; 1475 AioContext *aio_context; 1476 Error *local_error = NULL; 1477 1478 if (!state->created) { 1479 return; 1480 } 1481 1482 aio_context = bdrv_get_aio_context(state->bs); 1483 aio_context_acquire(aio_context); 1484 1485 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1486 error_reportf_err(local_error, 1487 "Failed to delete snapshot with id '%s' and " 1488 "name '%s' on device '%s' in abort: ", 1489 sn->id_str, sn->name, 1490 bdrv_get_device_name(bs)); 1491 } 1492 1493 aio_context_release(aio_context); 1494 } 1495 1496 static void internal_snapshot_clean(BlkActionState *common) 1497 { 1498 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1499 common, common); 1500 AioContext *aio_context; 1501 1502 if (!state->bs) { 1503 return; 1504 } 1505 1506 aio_context = bdrv_get_aio_context(state->bs); 1507 aio_context_acquire(aio_context); 1508 1509 bdrv_drained_end(state->bs); 1510 1511 aio_context_release(aio_context); 1512 } 1513 1514 /* external snapshot private data */ 1515 typedef struct ExternalSnapshotState { 1516 BlkActionState common; 1517 BlockDriverState *old_bs; 1518 BlockDriverState *new_bs; 1519 bool overlay_appended; 1520 } ExternalSnapshotState; 1521 1522 static void external_snapshot_prepare(BlkActionState *common, 1523 Error **errp) 1524 { 1525 int flags = 0; 1526 QDict *options = NULL; 1527 Error *local_err = NULL; 1528 /* Device and node name of the image to generate the snapshot from */ 1529 const char *device; 1530 const char *node_name; 1531 /* Reference to the new image (for 'blockdev-snapshot') */ 1532 const char *snapshot_ref; 1533 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1534 const char *new_image_file; 1535 ExternalSnapshotState *state = 1536 DO_UPCAST(ExternalSnapshotState, common, common); 1537 TransactionAction *action = common->action; 1538 AioContext *aio_context; 1539 int ret; 1540 1541 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1542 * purpose but a different set of parameters */ 1543 switch (action->type) { 1544 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1545 { 1546 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1547 device = s->node; 1548 node_name = s->node; 1549 new_image_file = NULL; 1550 snapshot_ref = s->overlay; 1551 } 1552 break; 1553 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1554 { 1555 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1556 device = s->has_device ? s->device : NULL; 1557 node_name = s->has_node_name ? s->node_name : NULL; 1558 new_image_file = s->snapshot_file; 1559 snapshot_ref = NULL; 1560 } 1561 break; 1562 default: 1563 g_assert_not_reached(); 1564 } 1565 1566 /* start processing */ 1567 if (action_check_completion_mode(common, errp) < 0) { 1568 return; 1569 } 1570 1571 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1572 if (!state->old_bs) { 1573 return; 1574 } 1575 1576 aio_context = bdrv_get_aio_context(state->old_bs); 1577 aio_context_acquire(aio_context); 1578 1579 /* Paired with .clean() */ 1580 bdrv_drained_begin(state->old_bs); 1581 1582 if (!bdrv_is_inserted(state->old_bs)) { 1583 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1584 goto out; 1585 } 1586 1587 if (bdrv_op_is_blocked(state->old_bs, 1588 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1589 goto out; 1590 } 1591 1592 if (!bdrv_is_read_only(state->old_bs)) { 1593 if (bdrv_flush(state->old_bs)) { 1594 error_setg(errp, QERR_IO_ERROR); 1595 goto out; 1596 } 1597 } 1598 1599 if (!bdrv_is_first_non_filter(state->old_bs)) { 1600 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1601 goto out; 1602 } 1603 1604 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1605 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1606 const char *format = s->has_format ? s->format : "qcow2"; 1607 enum NewImageMode mode; 1608 const char *snapshot_node_name = 1609 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1610 1611 if (node_name && !snapshot_node_name) { 1612 error_setg(errp, "New overlay node name missing"); 1613 goto out; 1614 } 1615 1616 if (snapshot_node_name && 1617 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1618 error_setg(errp, "New overlay node name already in use"); 1619 goto out; 1620 } 1621 1622 flags = state->old_bs->open_flags; 1623 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1624 flags |= BDRV_O_NO_BACKING; 1625 1626 /* create new image w/backing file */ 1627 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1628 if (mode != NEW_IMAGE_MODE_EXISTING) { 1629 int64_t size = bdrv_getlength(state->old_bs); 1630 if (size < 0) { 1631 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1632 goto out; 1633 } 1634 bdrv_refresh_filename(state->old_bs); 1635 bdrv_img_create(new_image_file, format, 1636 state->old_bs->filename, 1637 state->old_bs->drv->format_name, 1638 NULL, size, flags, false, &local_err); 1639 if (local_err) { 1640 error_propagate(errp, local_err); 1641 goto out; 1642 } 1643 } 1644 1645 options = qdict_new(); 1646 if (snapshot_node_name) { 1647 qdict_put_str(options, "node-name", snapshot_node_name); 1648 } 1649 qdict_put_str(options, "driver", format); 1650 } 1651 1652 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1653 errp); 1654 /* We will manually add the backing_hd field to the bs later */ 1655 if (!state->new_bs) { 1656 goto out; 1657 } 1658 1659 if (bdrv_has_blk(state->new_bs)) { 1660 error_setg(errp, "The overlay is already in use"); 1661 goto out; 1662 } 1663 1664 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1665 errp)) { 1666 goto out; 1667 } 1668 1669 if (state->new_bs->backing != NULL) { 1670 error_setg(errp, "The overlay already has a backing image"); 1671 goto out; 1672 } 1673 1674 if (!state->new_bs->drv->supports_backing) { 1675 error_setg(errp, "The overlay does not support backing images"); 1676 goto out; 1677 } 1678 1679 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp); 1680 if (ret < 0) { 1681 goto out; 1682 } 1683 1684 /* This removes our old bs and adds the new bs. This is an operation that 1685 * can fail, so we need to do it in .prepare; undoing it for abort is 1686 * always possible. */ 1687 bdrv_ref(state->new_bs); 1688 bdrv_append(state->new_bs, state->old_bs, &local_err); 1689 if (local_err) { 1690 error_propagate(errp, local_err); 1691 goto out; 1692 } 1693 state->overlay_appended = true; 1694 1695 out: 1696 aio_context_release(aio_context); 1697 } 1698 1699 static void external_snapshot_commit(BlkActionState *common) 1700 { 1701 ExternalSnapshotState *state = 1702 DO_UPCAST(ExternalSnapshotState, common, common); 1703 AioContext *aio_context; 1704 1705 aio_context = bdrv_get_aio_context(state->old_bs); 1706 aio_context_acquire(aio_context); 1707 1708 /* We don't need (or want) to use the transactional 1709 * bdrv_reopen_multiple() across all the entries at once, because we 1710 * don't want to abort all of them if one of them fails the reopen */ 1711 if (!atomic_read(&state->old_bs->copy_on_read)) { 1712 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1713 } 1714 1715 aio_context_release(aio_context); 1716 } 1717 1718 static void external_snapshot_abort(BlkActionState *common) 1719 { 1720 ExternalSnapshotState *state = 1721 DO_UPCAST(ExternalSnapshotState, common, common); 1722 if (state->new_bs) { 1723 if (state->overlay_appended) { 1724 AioContext *aio_context; 1725 1726 aio_context = bdrv_get_aio_context(state->old_bs); 1727 aio_context_acquire(aio_context); 1728 1729 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1730 close state->old_bs; we need it */ 1731 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1732 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1733 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1734 1735 aio_context_release(aio_context); 1736 } 1737 } 1738 } 1739 1740 static void external_snapshot_clean(BlkActionState *common) 1741 { 1742 ExternalSnapshotState *state = 1743 DO_UPCAST(ExternalSnapshotState, common, common); 1744 AioContext *aio_context; 1745 1746 if (!state->old_bs) { 1747 return; 1748 } 1749 1750 aio_context = bdrv_get_aio_context(state->old_bs); 1751 aio_context_acquire(aio_context); 1752 1753 bdrv_drained_end(state->old_bs); 1754 bdrv_unref(state->new_bs); 1755 1756 aio_context_release(aio_context); 1757 } 1758 1759 typedef struct DriveBackupState { 1760 BlkActionState common; 1761 BlockDriverState *bs; 1762 BlockJob *job; 1763 } DriveBackupState; 1764 1765 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1766 Error **errp); 1767 1768 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1769 { 1770 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1771 BlockDriverState *bs; 1772 DriveBackup *backup; 1773 AioContext *aio_context; 1774 Error *local_err = NULL; 1775 1776 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1777 backup = common->action->u.drive_backup.data; 1778 1779 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1780 if (!bs) { 1781 return; 1782 } 1783 1784 aio_context = bdrv_get_aio_context(bs); 1785 aio_context_acquire(aio_context); 1786 1787 /* Paired with .clean() */ 1788 bdrv_drained_begin(bs); 1789 1790 state->bs = bs; 1791 1792 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1793 if (local_err) { 1794 error_propagate(errp, local_err); 1795 goto out; 1796 } 1797 1798 out: 1799 aio_context_release(aio_context); 1800 } 1801 1802 static void drive_backup_commit(BlkActionState *common) 1803 { 1804 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1805 AioContext *aio_context; 1806 1807 aio_context = bdrv_get_aio_context(state->bs); 1808 aio_context_acquire(aio_context); 1809 1810 assert(state->job); 1811 job_start(&state->job->job); 1812 1813 aio_context_release(aio_context); 1814 } 1815 1816 static void drive_backup_abort(BlkActionState *common) 1817 { 1818 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1819 1820 if (state->job) { 1821 AioContext *aio_context; 1822 1823 aio_context = bdrv_get_aio_context(state->bs); 1824 aio_context_acquire(aio_context); 1825 1826 job_cancel_sync(&state->job->job); 1827 1828 aio_context_release(aio_context); 1829 } 1830 } 1831 1832 static void drive_backup_clean(BlkActionState *common) 1833 { 1834 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1835 AioContext *aio_context; 1836 1837 if (!state->bs) { 1838 return; 1839 } 1840 1841 aio_context = bdrv_get_aio_context(state->bs); 1842 aio_context_acquire(aio_context); 1843 1844 bdrv_drained_end(state->bs); 1845 1846 aio_context_release(aio_context); 1847 } 1848 1849 typedef struct BlockdevBackupState { 1850 BlkActionState common; 1851 BlockDriverState *bs; 1852 BlockJob *job; 1853 } BlockdevBackupState; 1854 1855 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1856 Error **errp); 1857 1858 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1859 { 1860 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1861 BlockdevBackup *backup; 1862 BlockDriverState *bs, *target; 1863 AioContext *aio_context; 1864 Error *local_err = NULL; 1865 1866 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1867 backup = common->action->u.blockdev_backup.data; 1868 1869 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1870 if (!bs) { 1871 return; 1872 } 1873 1874 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1875 if (!target) { 1876 return; 1877 } 1878 1879 aio_context = bdrv_get_aio_context(bs); 1880 aio_context_acquire(aio_context); 1881 state->bs = bs; 1882 1883 /* Paired with .clean() */ 1884 bdrv_drained_begin(state->bs); 1885 1886 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1887 if (local_err) { 1888 error_propagate(errp, local_err); 1889 goto out; 1890 } 1891 1892 out: 1893 aio_context_release(aio_context); 1894 } 1895 1896 static void blockdev_backup_commit(BlkActionState *common) 1897 { 1898 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1899 AioContext *aio_context; 1900 1901 aio_context = bdrv_get_aio_context(state->bs); 1902 aio_context_acquire(aio_context); 1903 1904 assert(state->job); 1905 job_start(&state->job->job); 1906 1907 aio_context_release(aio_context); 1908 } 1909 1910 static void blockdev_backup_abort(BlkActionState *common) 1911 { 1912 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1913 1914 if (state->job) { 1915 AioContext *aio_context; 1916 1917 aio_context = bdrv_get_aio_context(state->bs); 1918 aio_context_acquire(aio_context); 1919 1920 job_cancel_sync(&state->job->job); 1921 1922 aio_context_release(aio_context); 1923 } 1924 } 1925 1926 static void blockdev_backup_clean(BlkActionState *common) 1927 { 1928 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1929 AioContext *aio_context; 1930 1931 if (!state->bs) { 1932 return; 1933 } 1934 1935 aio_context = bdrv_get_aio_context(state->bs); 1936 aio_context_acquire(aio_context); 1937 1938 bdrv_drained_end(state->bs); 1939 1940 aio_context_release(aio_context); 1941 } 1942 1943 typedef struct BlockDirtyBitmapState { 1944 BlkActionState common; 1945 BdrvDirtyBitmap *bitmap; 1946 BlockDriverState *bs; 1947 HBitmap *backup; 1948 bool prepared; 1949 bool was_enabled; 1950 } BlockDirtyBitmapState; 1951 1952 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1953 Error **errp) 1954 { 1955 Error *local_err = NULL; 1956 BlockDirtyBitmapAdd *action; 1957 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1958 common, common); 1959 1960 if (action_check_completion_mode(common, errp) < 0) { 1961 return; 1962 } 1963 1964 action = common->action->u.block_dirty_bitmap_add.data; 1965 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1966 qmp_block_dirty_bitmap_add(action->node, action->name, 1967 action->has_granularity, action->granularity, 1968 action->has_persistent, action->persistent, 1969 action->has_autoload, action->autoload, 1970 action->has_disabled, action->disabled, 1971 &local_err); 1972 1973 if (!local_err) { 1974 state->prepared = true; 1975 } else { 1976 error_propagate(errp, local_err); 1977 } 1978 } 1979 1980 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1981 { 1982 BlockDirtyBitmapAdd *action; 1983 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1984 common, common); 1985 1986 action = common->action->u.block_dirty_bitmap_add.data; 1987 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1988 * then the node reference and bitmap name must have been valid. 1989 */ 1990 if (state->prepared) { 1991 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1992 } 1993 } 1994 1995 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1996 Error **errp) 1997 { 1998 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1999 common, common); 2000 BlockDirtyBitmap *action; 2001 2002 if (action_check_completion_mode(common, errp) < 0) { 2003 return; 2004 } 2005 2006 action = common->action->u.block_dirty_bitmap_clear.data; 2007 state->bitmap = block_dirty_bitmap_lookup(action->node, 2008 action->name, 2009 &state->bs, 2010 errp); 2011 if (!state->bitmap) { 2012 return; 2013 } 2014 2015 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2016 return; 2017 } 2018 2019 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2020 } 2021 2022 static void block_dirty_bitmap_restore(BlkActionState *common) 2023 { 2024 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2025 common, common); 2026 2027 if (state->backup) { 2028 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2029 } 2030 } 2031 2032 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2033 { 2034 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2035 common, common); 2036 2037 hbitmap_free(state->backup); 2038 } 2039 2040 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2041 Error **errp) 2042 { 2043 BlockDirtyBitmap *action; 2044 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2045 common, common); 2046 2047 if (action_check_completion_mode(common, errp) < 0) { 2048 return; 2049 } 2050 2051 action = common->action->u.block_dirty_bitmap_enable.data; 2052 state->bitmap = block_dirty_bitmap_lookup(action->node, 2053 action->name, 2054 NULL, 2055 errp); 2056 if (!state->bitmap) { 2057 return; 2058 } 2059 2060 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2061 return; 2062 } 2063 2064 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2065 bdrv_enable_dirty_bitmap(state->bitmap); 2066 } 2067 2068 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2069 { 2070 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2071 common, common); 2072 2073 if (!state->was_enabled) { 2074 bdrv_disable_dirty_bitmap(state->bitmap); 2075 } 2076 } 2077 2078 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2079 Error **errp) 2080 { 2081 BlockDirtyBitmap *action; 2082 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2083 common, common); 2084 2085 if (action_check_completion_mode(common, errp) < 0) { 2086 return; 2087 } 2088 2089 action = common->action->u.block_dirty_bitmap_disable.data; 2090 state->bitmap = block_dirty_bitmap_lookup(action->node, 2091 action->name, 2092 NULL, 2093 errp); 2094 if (!state->bitmap) { 2095 return; 2096 } 2097 2098 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2099 return; 2100 } 2101 2102 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2103 bdrv_disable_dirty_bitmap(state->bitmap); 2104 } 2105 2106 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2107 { 2108 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2109 common, common); 2110 2111 if (state->was_enabled) { 2112 bdrv_enable_dirty_bitmap(state->bitmap); 2113 } 2114 } 2115 2116 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2117 const char *node, const char *target, 2118 BlockDirtyBitmapMergeSourceList *bitmaps, 2119 HBitmap **backup, Error **errp); 2120 2121 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2122 Error **errp) 2123 { 2124 BlockDirtyBitmapMerge *action; 2125 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2126 common, common); 2127 2128 if (action_check_completion_mode(common, errp) < 0) { 2129 return; 2130 } 2131 2132 action = common->action->u.block_dirty_bitmap_merge.data; 2133 2134 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2135 action->bitmaps, &state->backup, 2136 errp); 2137 } 2138 2139 static BdrvDirtyBitmap *do_block_dirty_bitmap_remove( 2140 const char *node, const char *name, bool release, 2141 BlockDriverState **bitmap_bs, Error **errp); 2142 2143 static void block_dirty_bitmap_remove_prepare(BlkActionState *common, 2144 Error **errp) 2145 { 2146 BlockDirtyBitmap *action; 2147 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2148 common, common); 2149 2150 if (action_check_completion_mode(common, errp) < 0) { 2151 return; 2152 } 2153 2154 action = common->action->u.block_dirty_bitmap_remove.data; 2155 2156 state->bitmap = do_block_dirty_bitmap_remove(action->node, action->name, 2157 false, &state->bs, errp); 2158 if (state->bitmap) { 2159 bdrv_dirty_bitmap_skip_store(state->bitmap, true); 2160 bdrv_dirty_bitmap_set_busy(state->bitmap, true); 2161 } 2162 } 2163 2164 static void block_dirty_bitmap_remove_abort(BlkActionState *common) 2165 { 2166 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2167 common, common); 2168 2169 if (state->bitmap) { 2170 bdrv_dirty_bitmap_skip_store(state->bitmap, false); 2171 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2172 } 2173 } 2174 2175 static void block_dirty_bitmap_remove_commit(BlkActionState *common) 2176 { 2177 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2178 common, common); 2179 2180 bdrv_dirty_bitmap_set_busy(state->bitmap, false); 2181 bdrv_release_dirty_bitmap(state->bs, state->bitmap); 2182 } 2183 2184 static void abort_prepare(BlkActionState *common, Error **errp) 2185 { 2186 error_setg(errp, "Transaction aborted using Abort action"); 2187 } 2188 2189 static void abort_commit(BlkActionState *common) 2190 { 2191 g_assert_not_reached(); /* this action never succeeds */ 2192 } 2193 2194 static const BlkActionOps actions[] = { 2195 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2196 .instance_size = sizeof(ExternalSnapshotState), 2197 .prepare = external_snapshot_prepare, 2198 .commit = external_snapshot_commit, 2199 .abort = external_snapshot_abort, 2200 .clean = external_snapshot_clean, 2201 }, 2202 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2203 .instance_size = sizeof(ExternalSnapshotState), 2204 .prepare = external_snapshot_prepare, 2205 .commit = external_snapshot_commit, 2206 .abort = external_snapshot_abort, 2207 .clean = external_snapshot_clean, 2208 }, 2209 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2210 .instance_size = sizeof(DriveBackupState), 2211 .prepare = drive_backup_prepare, 2212 .commit = drive_backup_commit, 2213 .abort = drive_backup_abort, 2214 .clean = drive_backup_clean, 2215 }, 2216 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2217 .instance_size = sizeof(BlockdevBackupState), 2218 .prepare = blockdev_backup_prepare, 2219 .commit = blockdev_backup_commit, 2220 .abort = blockdev_backup_abort, 2221 .clean = blockdev_backup_clean, 2222 }, 2223 [TRANSACTION_ACTION_KIND_ABORT] = { 2224 .instance_size = sizeof(BlkActionState), 2225 .prepare = abort_prepare, 2226 .commit = abort_commit, 2227 }, 2228 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2229 .instance_size = sizeof(InternalSnapshotState), 2230 .prepare = internal_snapshot_prepare, 2231 .abort = internal_snapshot_abort, 2232 .clean = internal_snapshot_clean, 2233 }, 2234 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2235 .instance_size = sizeof(BlockDirtyBitmapState), 2236 .prepare = block_dirty_bitmap_add_prepare, 2237 .abort = block_dirty_bitmap_add_abort, 2238 }, 2239 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2240 .instance_size = sizeof(BlockDirtyBitmapState), 2241 .prepare = block_dirty_bitmap_clear_prepare, 2242 .commit = block_dirty_bitmap_free_backup, 2243 .abort = block_dirty_bitmap_restore, 2244 }, 2245 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2246 .instance_size = sizeof(BlockDirtyBitmapState), 2247 .prepare = block_dirty_bitmap_enable_prepare, 2248 .abort = block_dirty_bitmap_enable_abort, 2249 }, 2250 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2251 .instance_size = sizeof(BlockDirtyBitmapState), 2252 .prepare = block_dirty_bitmap_disable_prepare, 2253 .abort = block_dirty_bitmap_disable_abort, 2254 }, 2255 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2256 .instance_size = sizeof(BlockDirtyBitmapState), 2257 .prepare = block_dirty_bitmap_merge_prepare, 2258 .commit = block_dirty_bitmap_free_backup, 2259 .abort = block_dirty_bitmap_restore, 2260 }, 2261 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = { 2262 .instance_size = sizeof(BlockDirtyBitmapState), 2263 .prepare = block_dirty_bitmap_remove_prepare, 2264 .commit = block_dirty_bitmap_remove_commit, 2265 .abort = block_dirty_bitmap_remove_abort, 2266 }, 2267 /* Where are transactions for MIRROR, COMMIT and STREAM? 2268 * Although these blockjobs use transaction callbacks like the backup job, 2269 * these jobs do not necessarily adhere to transaction semantics. 2270 * These jobs may not fully undo all of their actions on abort, nor do they 2271 * necessarily work in transactions with more than one job in them. 2272 */ 2273 }; 2274 2275 /** 2276 * Allocate a TransactionProperties structure if necessary, and fill 2277 * that structure with desired defaults if they are unset. 2278 */ 2279 static TransactionProperties *get_transaction_properties( 2280 TransactionProperties *props) 2281 { 2282 if (!props) { 2283 props = g_new0(TransactionProperties, 1); 2284 } 2285 2286 if (!props->has_completion_mode) { 2287 props->has_completion_mode = true; 2288 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2289 } 2290 2291 return props; 2292 } 2293 2294 /* 2295 * 'Atomic' group operations. The operations are performed as a set, and if 2296 * any fail then we roll back all operations in the group. 2297 */ 2298 void qmp_transaction(TransactionActionList *dev_list, 2299 bool has_props, 2300 struct TransactionProperties *props, 2301 Error **errp) 2302 { 2303 TransactionActionList *dev_entry = dev_list; 2304 JobTxn *block_job_txn = NULL; 2305 BlkActionState *state, *next; 2306 Error *local_err = NULL; 2307 2308 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2309 QTAILQ_INIT(&snap_bdrv_states); 2310 2311 /* Does this transaction get canceled as a group on failure? 2312 * If not, we don't really need to make a JobTxn. 2313 */ 2314 props = get_transaction_properties(props); 2315 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2316 block_job_txn = job_txn_new(); 2317 } 2318 2319 /* drain all i/o before any operations */ 2320 bdrv_drain_all(); 2321 2322 /* We don't do anything in this loop that commits us to the operations */ 2323 while (NULL != dev_entry) { 2324 TransactionAction *dev_info = NULL; 2325 const BlkActionOps *ops; 2326 2327 dev_info = dev_entry->value; 2328 dev_entry = dev_entry->next; 2329 2330 assert(dev_info->type < ARRAY_SIZE(actions)); 2331 2332 ops = &actions[dev_info->type]; 2333 assert(ops->instance_size > 0); 2334 2335 state = g_malloc0(ops->instance_size); 2336 state->ops = ops; 2337 state->action = dev_info; 2338 state->block_job_txn = block_job_txn; 2339 state->txn_props = props; 2340 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2341 2342 state->ops->prepare(state, &local_err); 2343 if (local_err) { 2344 error_propagate(errp, local_err); 2345 goto delete_and_fail; 2346 } 2347 } 2348 2349 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2350 if (state->ops->commit) { 2351 state->ops->commit(state); 2352 } 2353 } 2354 2355 /* success */ 2356 goto exit; 2357 2358 delete_and_fail: 2359 /* failure, and it is all-or-none; roll back all operations */ 2360 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2361 if (state->ops->abort) { 2362 state->ops->abort(state); 2363 } 2364 } 2365 exit: 2366 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2367 if (state->ops->clean) { 2368 state->ops->clean(state); 2369 } 2370 g_free(state); 2371 } 2372 if (!has_props) { 2373 qapi_free_TransactionProperties(props); 2374 } 2375 job_txn_unref(block_job_txn); 2376 } 2377 2378 void qmp_eject(bool has_device, const char *device, 2379 bool has_id, const char *id, 2380 bool has_force, bool force, Error **errp) 2381 { 2382 Error *local_err = NULL; 2383 int rc; 2384 2385 if (!has_force) { 2386 force = false; 2387 } 2388 2389 rc = do_open_tray(has_device ? device : NULL, 2390 has_id ? id : NULL, 2391 force, &local_err); 2392 if (rc && rc != -ENOSYS) { 2393 error_propagate(errp, local_err); 2394 return; 2395 } 2396 error_free(local_err); 2397 2398 blockdev_remove_medium(has_device, device, has_id, id, errp); 2399 } 2400 2401 void qmp_block_passwd(bool has_device, const char *device, 2402 bool has_node_name, const char *node_name, 2403 const char *password, Error **errp) 2404 { 2405 error_setg(errp, 2406 "Setting block passwords directly is no longer supported"); 2407 } 2408 2409 /* 2410 * Attempt to open the tray of @device. 2411 * If @force, ignore its tray lock. 2412 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2413 * On error, store an error through @errp and return -errno. 2414 * If @device does not exist, return -ENODEV. 2415 * If it has no removable media, return -ENOTSUP. 2416 * If it has no tray, return -ENOSYS. 2417 * If the guest was asked to open the tray, return -EINPROGRESS. 2418 * Else, return 0. 2419 */ 2420 static int do_open_tray(const char *blk_name, const char *qdev_id, 2421 bool force, Error **errp) 2422 { 2423 BlockBackend *blk; 2424 const char *device = qdev_id ?: blk_name; 2425 bool locked; 2426 2427 blk = qmp_get_blk(blk_name, qdev_id, errp); 2428 if (!blk) { 2429 return -ENODEV; 2430 } 2431 2432 if (!blk_dev_has_removable_media(blk)) { 2433 error_setg(errp, "Device '%s' is not removable", device); 2434 return -ENOTSUP; 2435 } 2436 2437 if (!blk_dev_has_tray(blk)) { 2438 error_setg(errp, "Device '%s' does not have a tray", device); 2439 return -ENOSYS; 2440 } 2441 2442 if (blk_dev_is_tray_open(blk)) { 2443 return 0; 2444 } 2445 2446 locked = blk_dev_is_medium_locked(blk); 2447 if (locked) { 2448 blk_dev_eject_request(blk, force); 2449 } 2450 2451 if (!locked || force) { 2452 blk_dev_change_media_cb(blk, false, &error_abort); 2453 } 2454 2455 if (locked && !force) { 2456 error_setg(errp, "Device '%s' is locked and force was not specified, " 2457 "wait for tray to open and try again", device); 2458 return -EINPROGRESS; 2459 } 2460 2461 return 0; 2462 } 2463 2464 void qmp_blockdev_open_tray(bool has_device, const char *device, 2465 bool has_id, const char *id, 2466 bool has_force, bool force, 2467 Error **errp) 2468 { 2469 Error *local_err = NULL; 2470 int rc; 2471 2472 if (!has_force) { 2473 force = false; 2474 } 2475 rc = do_open_tray(has_device ? device : NULL, 2476 has_id ? id : NULL, 2477 force, &local_err); 2478 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2479 error_propagate(errp, local_err); 2480 return; 2481 } 2482 error_free(local_err); 2483 } 2484 2485 void qmp_blockdev_close_tray(bool has_device, const char *device, 2486 bool has_id, const char *id, 2487 Error **errp) 2488 { 2489 BlockBackend *blk; 2490 Error *local_err = NULL; 2491 2492 device = has_device ? device : NULL; 2493 id = has_id ? id : NULL; 2494 2495 blk = qmp_get_blk(device, id, errp); 2496 if (!blk) { 2497 return; 2498 } 2499 2500 if (!blk_dev_has_removable_media(blk)) { 2501 error_setg(errp, "Device '%s' is not removable", device ?: id); 2502 return; 2503 } 2504 2505 if (!blk_dev_has_tray(blk)) { 2506 /* Ignore this command on tray-less devices */ 2507 return; 2508 } 2509 2510 if (!blk_dev_is_tray_open(blk)) { 2511 return; 2512 } 2513 2514 blk_dev_change_media_cb(blk, true, &local_err); 2515 if (local_err) { 2516 error_propagate(errp, local_err); 2517 return; 2518 } 2519 } 2520 2521 static void blockdev_remove_medium(bool has_device, const char *device, 2522 bool has_id, const char *id, Error **errp) 2523 { 2524 BlockBackend *blk; 2525 BlockDriverState *bs; 2526 AioContext *aio_context; 2527 bool has_attached_device; 2528 2529 device = has_device ? device : NULL; 2530 id = has_id ? id : NULL; 2531 2532 blk = qmp_get_blk(device, id, errp); 2533 if (!blk) { 2534 return; 2535 } 2536 2537 /* For BBs without a device, we can exchange the BDS tree at will */ 2538 has_attached_device = blk_get_attached_dev(blk); 2539 2540 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2541 error_setg(errp, "Device '%s' is not removable", device ?: id); 2542 return; 2543 } 2544 2545 if (has_attached_device && blk_dev_has_tray(blk) && 2546 !blk_dev_is_tray_open(blk)) 2547 { 2548 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2549 return; 2550 } 2551 2552 bs = blk_bs(blk); 2553 if (!bs) { 2554 return; 2555 } 2556 2557 aio_context = bdrv_get_aio_context(bs); 2558 aio_context_acquire(aio_context); 2559 2560 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2561 goto out; 2562 } 2563 2564 blk_remove_bs(blk); 2565 2566 if (!blk_dev_has_tray(blk)) { 2567 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2568 * called at all); therefore, the medium needs to be ejected here. 2569 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2570 * value passed here (i.e. false). */ 2571 blk_dev_change_media_cb(blk, false, &error_abort); 2572 } 2573 2574 out: 2575 aio_context_release(aio_context); 2576 } 2577 2578 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2579 { 2580 blockdev_remove_medium(false, NULL, true, id, errp); 2581 } 2582 2583 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2584 BlockDriverState *bs, Error **errp) 2585 { 2586 Error *local_err = NULL; 2587 bool has_device; 2588 int ret; 2589 2590 /* For BBs without a device, we can exchange the BDS tree at will */ 2591 has_device = blk_get_attached_dev(blk); 2592 2593 if (has_device && !blk_dev_has_removable_media(blk)) { 2594 error_setg(errp, "Device is not removable"); 2595 return; 2596 } 2597 2598 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2599 error_setg(errp, "Tray of the device is not open"); 2600 return; 2601 } 2602 2603 if (blk_bs(blk)) { 2604 error_setg(errp, "There already is a medium in the device"); 2605 return; 2606 } 2607 2608 ret = blk_insert_bs(blk, bs, errp); 2609 if (ret < 0) { 2610 return; 2611 } 2612 2613 if (!blk_dev_has_tray(blk)) { 2614 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2615 * called at all); therefore, the medium needs to be pushed into the 2616 * slot here. 2617 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2618 * value passed here (i.e. true). */ 2619 blk_dev_change_media_cb(blk, true, &local_err); 2620 if (local_err) { 2621 error_propagate(errp, local_err); 2622 blk_remove_bs(blk); 2623 return; 2624 } 2625 } 2626 } 2627 2628 static void blockdev_insert_medium(bool has_device, const char *device, 2629 bool has_id, const char *id, 2630 const char *node_name, Error **errp) 2631 { 2632 BlockBackend *blk; 2633 BlockDriverState *bs; 2634 2635 blk = qmp_get_blk(has_device ? device : NULL, 2636 has_id ? id : NULL, 2637 errp); 2638 if (!blk) { 2639 return; 2640 } 2641 2642 bs = bdrv_find_node(node_name); 2643 if (!bs) { 2644 error_setg(errp, "Node '%s' not found", node_name); 2645 return; 2646 } 2647 2648 if (bdrv_has_blk(bs)) { 2649 error_setg(errp, "Node '%s' is already in use", node_name); 2650 return; 2651 } 2652 2653 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2654 } 2655 2656 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2657 Error **errp) 2658 { 2659 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2660 } 2661 2662 void qmp_blockdev_change_medium(bool has_device, const char *device, 2663 bool has_id, const char *id, 2664 const char *filename, 2665 bool has_format, const char *format, 2666 bool has_read_only, 2667 BlockdevChangeReadOnlyMode read_only, 2668 Error **errp) 2669 { 2670 BlockBackend *blk; 2671 BlockDriverState *medium_bs = NULL; 2672 int bdrv_flags; 2673 bool detect_zeroes; 2674 int rc; 2675 QDict *options = NULL; 2676 Error *err = NULL; 2677 2678 blk = qmp_get_blk(has_device ? device : NULL, 2679 has_id ? id : NULL, 2680 errp); 2681 if (!blk) { 2682 goto fail; 2683 } 2684 2685 if (blk_bs(blk)) { 2686 blk_update_root_state(blk); 2687 } 2688 2689 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2690 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2691 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2692 2693 if (!has_read_only) { 2694 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2695 } 2696 2697 switch (read_only) { 2698 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2699 break; 2700 2701 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2702 bdrv_flags &= ~BDRV_O_RDWR; 2703 break; 2704 2705 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2706 bdrv_flags |= BDRV_O_RDWR; 2707 break; 2708 2709 default: 2710 abort(); 2711 } 2712 2713 options = qdict_new(); 2714 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2715 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2716 2717 if (has_format) { 2718 qdict_put_str(options, "driver", format); 2719 } 2720 2721 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2722 if (!medium_bs) { 2723 goto fail; 2724 } 2725 2726 rc = do_open_tray(has_device ? device : NULL, 2727 has_id ? id : NULL, 2728 false, &err); 2729 if (rc && rc != -ENOSYS) { 2730 error_propagate(errp, err); 2731 goto fail; 2732 } 2733 error_free(err); 2734 err = NULL; 2735 2736 blockdev_remove_medium(has_device, device, has_id, id, &err); 2737 if (err) { 2738 error_propagate(errp, err); 2739 goto fail; 2740 } 2741 2742 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2743 if (err) { 2744 error_propagate(errp, err); 2745 goto fail; 2746 } 2747 2748 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2749 2750 fail: 2751 /* If the medium has been inserted, the device has its own reference, so 2752 * ours must be relinquished; and if it has not been inserted successfully, 2753 * the reference must be relinquished anyway */ 2754 bdrv_unref(medium_bs); 2755 } 2756 2757 /* throttling disk I/O limits */ 2758 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2759 { 2760 ThrottleConfig cfg; 2761 BlockDriverState *bs; 2762 BlockBackend *blk; 2763 AioContext *aio_context; 2764 2765 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2766 arg->has_id ? arg->id : NULL, 2767 errp); 2768 if (!blk) { 2769 return; 2770 } 2771 2772 aio_context = blk_get_aio_context(blk); 2773 aio_context_acquire(aio_context); 2774 2775 bs = blk_bs(blk); 2776 if (!bs) { 2777 error_setg(errp, "Device has no medium"); 2778 goto out; 2779 } 2780 2781 throttle_config_init(&cfg); 2782 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2783 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2784 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2785 2786 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2787 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2788 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2789 2790 if (arg->has_bps_max) { 2791 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2792 } 2793 if (arg->has_bps_rd_max) { 2794 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2795 } 2796 if (arg->has_bps_wr_max) { 2797 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2798 } 2799 if (arg->has_iops_max) { 2800 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2801 } 2802 if (arg->has_iops_rd_max) { 2803 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2804 } 2805 if (arg->has_iops_wr_max) { 2806 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2807 } 2808 2809 if (arg->has_bps_max_length) { 2810 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2811 } 2812 if (arg->has_bps_rd_max_length) { 2813 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2814 } 2815 if (arg->has_bps_wr_max_length) { 2816 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2817 } 2818 if (arg->has_iops_max_length) { 2819 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2820 } 2821 if (arg->has_iops_rd_max_length) { 2822 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2823 } 2824 if (arg->has_iops_wr_max_length) { 2825 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2826 } 2827 2828 if (arg->has_iops_size) { 2829 cfg.op_size = arg->iops_size; 2830 } 2831 2832 if (!throttle_is_valid(&cfg, errp)) { 2833 goto out; 2834 } 2835 2836 if (throttle_enabled(&cfg)) { 2837 /* Enable I/O limits if they're not enabled yet, otherwise 2838 * just update the throttling group. */ 2839 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2840 blk_io_limits_enable(blk, 2841 arg->has_group ? arg->group : 2842 arg->has_device ? arg->device : 2843 arg->id); 2844 } else if (arg->has_group) { 2845 blk_io_limits_update_group(blk, arg->group); 2846 } 2847 /* Set the new throttling configuration */ 2848 blk_set_io_limits(blk, &cfg); 2849 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2850 /* If all throttling settings are set to 0, disable I/O limits */ 2851 blk_io_limits_disable(blk); 2852 } 2853 2854 out: 2855 aio_context_release(aio_context); 2856 } 2857 2858 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2859 bool has_granularity, uint32_t granularity, 2860 bool has_persistent, bool persistent, 2861 bool has_autoload, bool autoload, 2862 bool has_disabled, bool disabled, 2863 Error **errp) 2864 { 2865 BlockDriverState *bs; 2866 BdrvDirtyBitmap *bitmap; 2867 2868 if (!name || name[0] == '\0') { 2869 error_setg(errp, "Bitmap name cannot be empty"); 2870 return; 2871 } 2872 2873 bs = bdrv_lookup_bs(node, node, errp); 2874 if (!bs) { 2875 return; 2876 } 2877 2878 if (has_granularity) { 2879 if (granularity < 512 || !is_power_of_2(granularity)) { 2880 error_setg(errp, "Granularity must be power of 2 " 2881 "and at least 512"); 2882 return; 2883 } 2884 } else { 2885 /* Default to cluster size, if available: */ 2886 granularity = bdrv_get_default_bitmap_granularity(bs); 2887 } 2888 2889 if (!has_persistent) { 2890 persistent = false; 2891 } 2892 2893 if (has_autoload) { 2894 warn_report("Autoload option is deprecated and its value is ignored"); 2895 } 2896 2897 if (!has_disabled) { 2898 disabled = false; 2899 } 2900 2901 if (persistent) { 2902 AioContext *aio_context = bdrv_get_aio_context(bs); 2903 bool ok; 2904 2905 aio_context_acquire(aio_context); 2906 ok = bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp); 2907 aio_context_release(aio_context); 2908 if (!ok) { 2909 return; 2910 } 2911 } 2912 2913 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2914 if (bitmap == NULL) { 2915 return; 2916 } 2917 2918 if (disabled) { 2919 bdrv_disable_dirty_bitmap(bitmap); 2920 } 2921 2922 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2923 } 2924 2925 static BdrvDirtyBitmap *do_block_dirty_bitmap_remove( 2926 const char *node, const char *name, bool release, 2927 BlockDriverState **bitmap_bs, Error **errp) 2928 { 2929 BlockDriverState *bs; 2930 BdrvDirtyBitmap *bitmap; 2931 2932 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2933 if (!bitmap || !bs) { 2934 return NULL; 2935 } 2936 2937 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2938 errp)) { 2939 return NULL; 2940 } 2941 2942 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2943 AioContext *aio_context = bdrv_get_aio_context(bs); 2944 Error *local_err = NULL; 2945 2946 aio_context_acquire(aio_context); 2947 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2948 aio_context_release(aio_context); 2949 2950 if (local_err != NULL) { 2951 error_propagate(errp, local_err); 2952 return NULL; 2953 } 2954 } 2955 2956 if (release) { 2957 bdrv_release_dirty_bitmap(bs, bitmap); 2958 } 2959 2960 if (bitmap_bs) { 2961 *bitmap_bs = bs; 2962 } 2963 2964 return release ? NULL : bitmap; 2965 } 2966 2967 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2968 Error **errp) 2969 { 2970 do_block_dirty_bitmap_remove(node, name, true, NULL, errp); 2971 } 2972 2973 /** 2974 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2975 * immediately after a full backup operation. 2976 */ 2977 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2978 Error **errp) 2979 { 2980 BdrvDirtyBitmap *bitmap; 2981 BlockDriverState *bs; 2982 2983 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2984 if (!bitmap || !bs) { 2985 return; 2986 } 2987 2988 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2989 return; 2990 } 2991 2992 bdrv_clear_dirty_bitmap(bitmap, NULL); 2993 } 2994 2995 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2996 Error **errp) 2997 { 2998 BlockDriverState *bs; 2999 BdrvDirtyBitmap *bitmap; 3000 3001 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3002 if (!bitmap) { 3003 return; 3004 } 3005 3006 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 3007 return; 3008 } 3009 3010 bdrv_enable_dirty_bitmap(bitmap); 3011 } 3012 3013 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 3014 Error **errp) 3015 { 3016 BlockDriverState *bs; 3017 BdrvDirtyBitmap *bitmap; 3018 3019 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3020 if (!bitmap) { 3021 return; 3022 } 3023 3024 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 3025 return; 3026 } 3027 3028 bdrv_disable_dirty_bitmap(bitmap); 3029 } 3030 3031 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 3032 const char *node, const char *target, 3033 BlockDirtyBitmapMergeSourceList *bitmaps, 3034 HBitmap **backup, Error **errp) 3035 { 3036 BlockDriverState *bs; 3037 BdrvDirtyBitmap *dst, *src, *anon; 3038 BlockDirtyBitmapMergeSourceList *lst; 3039 Error *local_err = NULL; 3040 3041 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 3042 if (!dst) { 3043 return NULL; 3044 } 3045 3046 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 3047 NULL, errp); 3048 if (!anon) { 3049 return NULL; 3050 } 3051 3052 for (lst = bitmaps; lst; lst = lst->next) { 3053 switch (lst->value->type) { 3054 const char *name, *node; 3055 case QTYPE_QSTRING: 3056 name = lst->value->u.local; 3057 src = bdrv_find_dirty_bitmap(bs, name); 3058 if (!src) { 3059 error_setg(errp, "Dirty bitmap '%s' not found", name); 3060 dst = NULL; 3061 goto out; 3062 } 3063 break; 3064 case QTYPE_QDICT: 3065 node = lst->value->u.external.node; 3066 name = lst->value->u.external.name; 3067 src = block_dirty_bitmap_lookup(node, name, NULL, errp); 3068 if (!src) { 3069 dst = NULL; 3070 goto out; 3071 } 3072 break; 3073 default: 3074 abort(); 3075 } 3076 3077 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 3078 if (local_err) { 3079 error_propagate(errp, local_err); 3080 dst = NULL; 3081 goto out; 3082 } 3083 } 3084 3085 /* Merge into dst; dst is unchanged on failure. */ 3086 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3087 3088 out: 3089 bdrv_release_dirty_bitmap(bs, anon); 3090 return dst; 3091 } 3092 3093 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3094 BlockDirtyBitmapMergeSourceList *bitmaps, 3095 Error **errp) 3096 { 3097 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3098 } 3099 3100 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3101 const char *name, 3102 Error **errp) 3103 { 3104 BdrvDirtyBitmap *bitmap; 3105 BlockDriverState *bs; 3106 BlockDirtyBitmapSha256 *ret = NULL; 3107 char *sha256; 3108 3109 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3110 if (!bitmap || !bs) { 3111 return NULL; 3112 } 3113 3114 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3115 if (sha256 == NULL) { 3116 return NULL; 3117 } 3118 3119 ret = g_new(BlockDirtyBitmapSha256, 1); 3120 ret->sha256 = sha256; 3121 3122 return ret; 3123 } 3124 3125 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3126 { 3127 const char *id = qdict_get_str(qdict, "id"); 3128 BlockBackend *blk; 3129 BlockDriverState *bs; 3130 AioContext *aio_context; 3131 Error *local_err = NULL; 3132 3133 bs = bdrv_find_node(id); 3134 if (bs) { 3135 qmp_blockdev_del(id, &local_err); 3136 if (local_err) { 3137 error_report_err(local_err); 3138 } 3139 return; 3140 } 3141 3142 blk = blk_by_name(id); 3143 if (!blk) { 3144 error_report("Device '%s' not found", id); 3145 return; 3146 } 3147 3148 if (!blk_legacy_dinfo(blk)) { 3149 error_report("Deleting device added with blockdev-add" 3150 " is not supported"); 3151 return; 3152 } 3153 3154 aio_context = blk_get_aio_context(blk); 3155 aio_context_acquire(aio_context); 3156 3157 bs = blk_bs(blk); 3158 if (bs) { 3159 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3160 error_report_err(local_err); 3161 aio_context_release(aio_context); 3162 return; 3163 } 3164 3165 blk_remove_bs(blk); 3166 } 3167 3168 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3169 monitor_remove_blk(blk); 3170 3171 /* If this BlockBackend has a device attached to it, its refcount will be 3172 * decremented when the device is removed; otherwise we have to do so here. 3173 */ 3174 if (blk_get_attached_dev(blk)) { 3175 /* Further I/O must not pause the guest */ 3176 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3177 BLOCKDEV_ON_ERROR_REPORT); 3178 } else { 3179 blk_unref(blk); 3180 } 3181 3182 aio_context_release(aio_context); 3183 } 3184 3185 void qmp_block_resize(bool has_device, const char *device, 3186 bool has_node_name, const char *node_name, 3187 int64_t size, Error **errp) 3188 { 3189 Error *local_err = NULL; 3190 BlockBackend *blk = NULL; 3191 BlockDriverState *bs; 3192 AioContext *aio_context; 3193 int ret; 3194 3195 bs = bdrv_lookup_bs(has_device ? device : NULL, 3196 has_node_name ? node_name : NULL, 3197 &local_err); 3198 if (local_err) { 3199 error_propagate(errp, local_err); 3200 return; 3201 } 3202 3203 aio_context = bdrv_get_aio_context(bs); 3204 aio_context_acquire(aio_context); 3205 3206 if (!bdrv_is_first_non_filter(bs)) { 3207 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3208 goto out; 3209 } 3210 3211 if (size < 0) { 3212 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3213 goto out; 3214 } 3215 3216 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3217 error_setg(errp, QERR_DEVICE_IN_USE, device); 3218 goto out; 3219 } 3220 3221 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL); 3222 ret = blk_insert_bs(blk, bs, errp); 3223 if (ret < 0) { 3224 goto out; 3225 } 3226 3227 bdrv_drained_begin(bs); 3228 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3229 bdrv_drained_end(bs); 3230 3231 out: 3232 blk_unref(blk); 3233 aio_context_release(aio_context); 3234 } 3235 3236 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3237 bool has_base, const char *base, 3238 bool has_base_node, const char *base_node, 3239 bool has_backing_file, const char *backing_file, 3240 bool has_speed, int64_t speed, 3241 bool has_on_error, BlockdevOnError on_error, 3242 bool has_auto_finalize, bool auto_finalize, 3243 bool has_auto_dismiss, bool auto_dismiss, 3244 Error **errp) 3245 { 3246 BlockDriverState *bs, *iter; 3247 BlockDriverState *base_bs = NULL; 3248 AioContext *aio_context; 3249 Error *local_err = NULL; 3250 const char *base_name = NULL; 3251 int job_flags = JOB_DEFAULT; 3252 3253 if (!has_on_error) { 3254 on_error = BLOCKDEV_ON_ERROR_REPORT; 3255 } 3256 3257 bs = bdrv_lookup_bs(device, device, errp); 3258 if (!bs) { 3259 return; 3260 } 3261 3262 aio_context = bdrv_get_aio_context(bs); 3263 aio_context_acquire(aio_context); 3264 3265 if (has_base && has_base_node) { 3266 error_setg(errp, "'base' and 'base-node' cannot be specified " 3267 "at the same time"); 3268 goto out; 3269 } 3270 3271 if (has_base) { 3272 base_bs = bdrv_find_backing_image(bs, base); 3273 if (base_bs == NULL) { 3274 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3275 goto out; 3276 } 3277 assert(bdrv_get_aio_context(base_bs) == aio_context); 3278 base_name = base; 3279 } 3280 3281 if (has_base_node) { 3282 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3283 if (!base_bs) { 3284 goto out; 3285 } 3286 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3287 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3288 base_node, device); 3289 goto out; 3290 } 3291 assert(bdrv_get_aio_context(base_bs) == aio_context); 3292 bdrv_refresh_filename(base_bs); 3293 base_name = base_bs->filename; 3294 } 3295 3296 /* Check for op blockers in the whole chain between bs and base */ 3297 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3298 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3299 goto out; 3300 } 3301 } 3302 3303 /* if we are streaming the entire chain, the result will have no backing 3304 * file, and specifying one is therefore an error */ 3305 if (base_bs == NULL && has_backing_file) { 3306 error_setg(errp, "backing file specified, but streaming the " 3307 "entire chain"); 3308 goto out; 3309 } 3310 3311 /* backing_file string overrides base bs filename */ 3312 base_name = has_backing_file ? backing_file : base_name; 3313 3314 if (has_auto_finalize && !auto_finalize) { 3315 job_flags |= JOB_MANUAL_FINALIZE; 3316 } 3317 if (has_auto_dismiss && !auto_dismiss) { 3318 job_flags |= JOB_MANUAL_DISMISS; 3319 } 3320 3321 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3322 job_flags, has_speed ? speed : 0, on_error, &local_err); 3323 if (local_err) { 3324 error_propagate(errp, local_err); 3325 goto out; 3326 } 3327 3328 trace_qmp_block_stream(bs); 3329 3330 out: 3331 aio_context_release(aio_context); 3332 } 3333 3334 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3335 bool has_base_node, const char *base_node, 3336 bool has_base, const char *base, 3337 bool has_top_node, const char *top_node, 3338 bool has_top, const char *top, 3339 bool has_backing_file, const char *backing_file, 3340 bool has_speed, int64_t speed, 3341 bool has_filter_node_name, const char *filter_node_name, 3342 bool has_auto_finalize, bool auto_finalize, 3343 bool has_auto_dismiss, bool auto_dismiss, 3344 Error **errp) 3345 { 3346 BlockDriverState *bs; 3347 BlockDriverState *iter; 3348 BlockDriverState *base_bs, *top_bs; 3349 AioContext *aio_context; 3350 Error *local_err = NULL; 3351 /* This will be part of the QMP command, if/when the 3352 * BlockdevOnError change for blkmirror makes it in 3353 */ 3354 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3355 int job_flags = JOB_DEFAULT; 3356 3357 if (!has_speed) { 3358 speed = 0; 3359 } 3360 if (!has_filter_node_name) { 3361 filter_node_name = NULL; 3362 } 3363 if (has_auto_finalize && !auto_finalize) { 3364 job_flags |= JOB_MANUAL_FINALIZE; 3365 } 3366 if (has_auto_dismiss && !auto_dismiss) { 3367 job_flags |= JOB_MANUAL_DISMISS; 3368 } 3369 3370 /* Important Note: 3371 * libvirt relies on the DeviceNotFound error class in order to probe for 3372 * live commit feature versions; for this to work, we must make sure to 3373 * perform the device lookup before any generic errors that may occur in a 3374 * scenario in which all optional arguments are omitted. */ 3375 bs = qmp_get_root_bs(device, &local_err); 3376 if (!bs) { 3377 bs = bdrv_lookup_bs(device, device, NULL); 3378 if (!bs) { 3379 error_free(local_err); 3380 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3381 "Device '%s' not found", device); 3382 } else { 3383 error_propagate(errp, local_err); 3384 } 3385 return; 3386 } 3387 3388 aio_context = bdrv_get_aio_context(bs); 3389 aio_context_acquire(aio_context); 3390 3391 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3392 goto out; 3393 } 3394 3395 /* default top_bs is the active layer */ 3396 top_bs = bs; 3397 3398 if (has_top_node && has_top) { 3399 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3400 goto out; 3401 } else if (has_top_node) { 3402 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3403 if (top_bs == NULL) { 3404 goto out; 3405 } 3406 if (!bdrv_chain_contains(bs, top_bs)) { 3407 error_setg(errp, "'%s' is not in this backing file chain", 3408 top_node); 3409 goto out; 3410 } 3411 } else if (has_top && top) { 3412 /* This strcmp() is just a shortcut, there is no need to 3413 * refresh @bs's filename. If it mismatches, 3414 * bdrv_find_backing_image() will do the refresh and may still 3415 * return @bs. */ 3416 if (strcmp(bs->filename, top) != 0) { 3417 top_bs = bdrv_find_backing_image(bs, top); 3418 } 3419 } 3420 3421 if (top_bs == NULL) { 3422 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3423 goto out; 3424 } 3425 3426 assert(bdrv_get_aio_context(top_bs) == aio_context); 3427 3428 if (has_base_node && has_base) { 3429 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3430 goto out; 3431 } else if (has_base_node) { 3432 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3433 if (base_bs == NULL) { 3434 goto out; 3435 } 3436 if (!bdrv_chain_contains(top_bs, base_bs)) { 3437 error_setg(errp, "'%s' is not in this backing file chain", 3438 base_node); 3439 goto out; 3440 } 3441 } else if (has_base && base) { 3442 base_bs = bdrv_find_backing_image(top_bs, base); 3443 } else { 3444 base_bs = bdrv_find_base(top_bs); 3445 } 3446 3447 if (base_bs == NULL) { 3448 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3449 goto out; 3450 } 3451 3452 assert(bdrv_get_aio_context(base_bs) == aio_context); 3453 3454 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3455 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3456 goto out; 3457 } 3458 } 3459 3460 /* Do not allow attempts to commit an image into itself */ 3461 if (top_bs == base_bs) { 3462 error_setg(errp, "cannot commit an image into itself"); 3463 goto out; 3464 } 3465 3466 if (top_bs == bs) { 3467 if (has_backing_file) { 3468 error_setg(errp, "'backing-file' specified," 3469 " but 'top' is the active layer"); 3470 goto out; 3471 } 3472 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3473 job_flags, speed, on_error, 3474 filter_node_name, NULL, NULL, false, &local_err); 3475 } else { 3476 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3477 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3478 goto out; 3479 } 3480 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3481 speed, on_error, has_backing_file ? backing_file : NULL, 3482 filter_node_name, &local_err); 3483 } 3484 if (local_err != NULL) { 3485 error_propagate(errp, local_err); 3486 goto out; 3487 } 3488 3489 out: 3490 aio_context_release(aio_context); 3491 } 3492 3493 /* Common QMP interface for drive-backup and blockdev-backup */ 3494 static BlockJob *do_backup_common(BackupCommon *backup, 3495 BlockDriverState *bs, 3496 BlockDriverState *target_bs, 3497 AioContext *aio_context, 3498 JobTxn *txn, Error **errp) 3499 { 3500 BlockJob *job = NULL; 3501 BdrvDirtyBitmap *bmap = NULL; 3502 int job_flags = JOB_DEFAULT; 3503 int ret; 3504 3505 if (!backup->has_speed) { 3506 backup->speed = 0; 3507 } 3508 if (!backup->has_on_source_error) { 3509 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3510 } 3511 if (!backup->has_on_target_error) { 3512 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3513 } 3514 if (!backup->has_job_id) { 3515 backup->job_id = NULL; 3516 } 3517 if (!backup->has_auto_finalize) { 3518 backup->auto_finalize = true; 3519 } 3520 if (!backup->has_auto_dismiss) { 3521 backup->auto_dismiss = true; 3522 } 3523 if (!backup->has_compress) { 3524 backup->compress = false; 3525 } 3526 3527 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3528 if (ret < 0) { 3529 return NULL; 3530 } 3531 3532 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || 3533 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { 3534 /* done before desugaring 'incremental' to print the right message */ 3535 if (!backup->has_bitmap) { 3536 error_setg(errp, "must provide a valid bitmap name for " 3537 "'%s' sync mode", MirrorSyncMode_str(backup->sync)); 3538 return NULL; 3539 } 3540 } 3541 3542 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { 3543 if (backup->has_bitmap_mode && 3544 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { 3545 error_setg(errp, "Bitmap sync mode must be '%s' " 3546 "when using sync mode '%s'", 3547 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), 3548 MirrorSyncMode_str(backup->sync)); 3549 return NULL; 3550 } 3551 backup->has_bitmap_mode = true; 3552 backup->sync = MIRROR_SYNC_MODE_BITMAP; 3553 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; 3554 } 3555 3556 if (backup->has_bitmap) { 3557 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3558 if (!bmap) { 3559 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3560 return NULL; 3561 } 3562 if (!backup->has_bitmap_mode) { 3563 error_setg(errp, "Bitmap sync mode must be given " 3564 "when providing a bitmap"); 3565 return NULL; 3566 } 3567 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { 3568 return NULL; 3569 } 3570 3571 /* This does not produce a useful bitmap artifact: */ 3572 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3573 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" 3574 " outputs", MirrorSyncMode_str(backup->sync)); 3575 return NULL; 3576 } 3577 3578 /* If the bitmap isn't used for input or output, this is useless: */ 3579 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && 3580 backup->sync != MIRROR_SYNC_MODE_BITMAP) { 3581 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" 3582 " when combined with sync mode '%s'", 3583 BitmapSyncMode_str(backup->bitmap_mode), 3584 MirrorSyncMode_str(backup->sync)); 3585 return NULL; 3586 } 3587 } 3588 3589 if (!backup->has_bitmap && backup->has_bitmap_mode) { 3590 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); 3591 return NULL; 3592 } 3593 3594 if (!backup->auto_finalize) { 3595 job_flags |= JOB_MANUAL_FINALIZE; 3596 } 3597 if (!backup->auto_dismiss) { 3598 job_flags |= JOB_MANUAL_DISMISS; 3599 } 3600 3601 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3602 backup->sync, bmap, backup->bitmap_mode, 3603 backup->compress, 3604 backup->on_source_error, 3605 backup->on_target_error, 3606 job_flags, NULL, NULL, txn, errp); 3607 return job; 3608 } 3609 3610 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3611 Error **errp) 3612 { 3613 BlockDriverState *bs; 3614 BlockDriverState *target_bs; 3615 BlockDriverState *source = NULL; 3616 BlockJob *job = NULL; 3617 AioContext *aio_context; 3618 QDict *options; 3619 Error *local_err = NULL; 3620 int flags; 3621 int64_t size; 3622 bool set_backing_hd = false; 3623 3624 if (!backup->has_mode) { 3625 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3626 } 3627 3628 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3629 if (!bs) { 3630 return NULL; 3631 } 3632 3633 if (!bs->drv) { 3634 error_setg(errp, "Device has no medium"); 3635 return NULL; 3636 } 3637 3638 aio_context = bdrv_get_aio_context(bs); 3639 aio_context_acquire(aio_context); 3640 3641 if (!backup->has_format) { 3642 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3643 NULL : (char*) bs->drv->format_name; 3644 } 3645 3646 /* Early check to avoid creating target */ 3647 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3648 goto out; 3649 } 3650 3651 flags = bs->open_flags | BDRV_O_RDWR; 3652 3653 /* See if we have a backing HD we can use to create our new image 3654 * on top of. */ 3655 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3656 source = backing_bs(bs); 3657 if (!source) { 3658 backup->sync = MIRROR_SYNC_MODE_FULL; 3659 } 3660 } 3661 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3662 source = bs; 3663 flags |= BDRV_O_NO_BACKING; 3664 set_backing_hd = true; 3665 } 3666 3667 size = bdrv_getlength(bs); 3668 if (size < 0) { 3669 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3670 goto out; 3671 } 3672 3673 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3674 assert(backup->format); 3675 if (source) { 3676 bdrv_refresh_filename(source); 3677 bdrv_img_create(backup->target, backup->format, source->filename, 3678 source->drv->format_name, NULL, 3679 size, flags, false, &local_err); 3680 } else { 3681 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3682 size, flags, false, &local_err); 3683 } 3684 } 3685 3686 if (local_err) { 3687 error_propagate(errp, local_err); 3688 goto out; 3689 } 3690 3691 options = qdict_new(); 3692 qdict_put_str(options, "discard", "unmap"); 3693 qdict_put_str(options, "detect-zeroes", "unmap"); 3694 if (backup->format) { 3695 qdict_put_str(options, "driver", backup->format); 3696 } 3697 3698 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3699 if (!target_bs) { 3700 goto out; 3701 } 3702 3703 if (set_backing_hd) { 3704 bdrv_set_backing_hd(target_bs, source, &local_err); 3705 if (local_err) { 3706 goto unref; 3707 } 3708 } 3709 3710 job = do_backup_common(qapi_DriveBackup_base(backup), 3711 bs, target_bs, aio_context, txn, errp); 3712 3713 unref: 3714 bdrv_unref(target_bs); 3715 out: 3716 aio_context_release(aio_context); 3717 return job; 3718 } 3719 3720 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3721 { 3722 3723 BlockJob *job; 3724 job = do_drive_backup(arg, NULL, errp); 3725 if (job) { 3726 job_start(&job->job); 3727 } 3728 } 3729 3730 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3731 { 3732 return bdrv_named_nodes_list(errp); 3733 } 3734 3735 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3736 { 3737 return bdrv_get_xdbg_block_graph(errp); 3738 } 3739 3740 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3741 Error **errp) 3742 { 3743 BlockDriverState *bs; 3744 BlockDriverState *target_bs; 3745 AioContext *aio_context; 3746 BlockJob *job; 3747 3748 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3749 if (!bs) { 3750 return NULL; 3751 } 3752 3753 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3754 if (!target_bs) { 3755 return NULL; 3756 } 3757 3758 aio_context = bdrv_get_aio_context(bs); 3759 aio_context_acquire(aio_context); 3760 3761 job = do_backup_common(qapi_BlockdevBackup_base(backup), 3762 bs, target_bs, aio_context, txn, errp); 3763 3764 aio_context_release(aio_context); 3765 return job; 3766 } 3767 3768 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3769 { 3770 BlockJob *job; 3771 job = do_blockdev_backup(arg, NULL, errp); 3772 if (job) { 3773 job_start(&job->job); 3774 } 3775 } 3776 3777 /* Parameter check and block job starting for drive mirroring. 3778 * Caller should hold @device and @target's aio context (must be the same). 3779 **/ 3780 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3781 BlockDriverState *target, 3782 bool has_replaces, const char *replaces, 3783 enum MirrorSyncMode sync, 3784 BlockMirrorBackingMode backing_mode, 3785 bool zero_target, 3786 bool has_speed, int64_t speed, 3787 bool has_granularity, uint32_t granularity, 3788 bool has_buf_size, int64_t buf_size, 3789 bool has_on_source_error, 3790 BlockdevOnError on_source_error, 3791 bool has_on_target_error, 3792 BlockdevOnError on_target_error, 3793 bool has_unmap, bool unmap, 3794 bool has_filter_node_name, 3795 const char *filter_node_name, 3796 bool has_copy_mode, MirrorCopyMode copy_mode, 3797 bool has_auto_finalize, bool auto_finalize, 3798 bool has_auto_dismiss, bool auto_dismiss, 3799 Error **errp) 3800 { 3801 int job_flags = JOB_DEFAULT; 3802 3803 if (!has_speed) { 3804 speed = 0; 3805 } 3806 if (!has_on_source_error) { 3807 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3808 } 3809 if (!has_on_target_error) { 3810 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3811 } 3812 if (!has_granularity) { 3813 granularity = 0; 3814 } 3815 if (!has_buf_size) { 3816 buf_size = 0; 3817 } 3818 if (!has_unmap) { 3819 unmap = true; 3820 } 3821 if (!has_filter_node_name) { 3822 filter_node_name = NULL; 3823 } 3824 if (!has_copy_mode) { 3825 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3826 } 3827 if (has_auto_finalize && !auto_finalize) { 3828 job_flags |= JOB_MANUAL_FINALIZE; 3829 } 3830 if (has_auto_dismiss && !auto_dismiss) { 3831 job_flags |= JOB_MANUAL_DISMISS; 3832 } 3833 3834 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3835 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3836 "a value in range [512B, 64MB]"); 3837 return; 3838 } 3839 if (granularity & (granularity - 1)) { 3840 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3841 "power of 2"); 3842 return; 3843 } 3844 3845 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3846 return; 3847 } 3848 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3849 return; 3850 } 3851 3852 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3853 sync = MIRROR_SYNC_MODE_FULL; 3854 } 3855 3856 if (has_replaces) { 3857 BlockDriverState *to_replace_bs; 3858 AioContext *replace_aio_context; 3859 int64_t bs_size, replace_size; 3860 3861 bs_size = bdrv_getlength(bs); 3862 if (bs_size < 0) { 3863 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3864 return; 3865 } 3866 3867 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3868 if (!to_replace_bs) { 3869 return; 3870 } 3871 3872 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3873 aio_context_acquire(replace_aio_context); 3874 replace_size = bdrv_getlength(to_replace_bs); 3875 aio_context_release(replace_aio_context); 3876 3877 if (replace_size < 0) { 3878 error_setg_errno(errp, -replace_size, 3879 "Failed to query the replacement node's size"); 3880 return; 3881 } 3882 if (bs_size != replace_size) { 3883 error_setg(errp, "cannot replace image with a mirror image of " 3884 "different size"); 3885 return; 3886 } 3887 } 3888 3889 /* pass the node name to replace to mirror start since it's loose coupling 3890 * and will allow to check whether the node still exist at mirror completion 3891 */ 3892 mirror_start(job_id, bs, target, 3893 has_replaces ? replaces : NULL, job_flags, 3894 speed, granularity, buf_size, sync, backing_mode, zero_target, 3895 on_source_error, on_target_error, unmap, filter_node_name, 3896 copy_mode, errp); 3897 } 3898 3899 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3900 { 3901 BlockDriverState *bs; 3902 BlockDriverState *source, *target_bs; 3903 AioContext *aio_context; 3904 BlockMirrorBackingMode backing_mode; 3905 Error *local_err = NULL; 3906 QDict *options = NULL; 3907 int flags; 3908 int64_t size; 3909 const char *format = arg->format; 3910 bool zero_target; 3911 int ret; 3912 3913 bs = qmp_get_root_bs(arg->device, errp); 3914 if (!bs) { 3915 return; 3916 } 3917 3918 /* Early check to avoid creating target */ 3919 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3920 return; 3921 } 3922 3923 aio_context = bdrv_get_aio_context(bs); 3924 aio_context_acquire(aio_context); 3925 3926 if (!arg->has_mode) { 3927 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3928 } 3929 3930 if (!arg->has_format) { 3931 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3932 ? NULL : bs->drv->format_name); 3933 } 3934 3935 flags = bs->open_flags | BDRV_O_RDWR; 3936 source = backing_bs(bs); 3937 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3938 arg->sync = MIRROR_SYNC_MODE_FULL; 3939 } 3940 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3941 source = bs; 3942 } 3943 3944 size = bdrv_getlength(bs); 3945 if (size < 0) { 3946 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3947 goto out; 3948 } 3949 3950 if (arg->has_replaces) { 3951 if (!arg->has_node_name) { 3952 error_setg(errp, "a node-name must be provided when replacing a" 3953 " named node of the graph"); 3954 goto out; 3955 } 3956 } 3957 3958 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3959 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3960 } else { 3961 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3962 } 3963 3964 /* Don't open backing image in create() */ 3965 flags |= BDRV_O_NO_BACKING; 3966 3967 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3968 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3969 { 3970 /* create new image w/o backing file */ 3971 assert(format); 3972 bdrv_img_create(arg->target, format, 3973 NULL, NULL, NULL, size, flags, false, &local_err); 3974 } else { 3975 switch (arg->mode) { 3976 case NEW_IMAGE_MODE_EXISTING: 3977 break; 3978 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3979 /* create new image with backing file */ 3980 bdrv_refresh_filename(source); 3981 bdrv_img_create(arg->target, format, 3982 source->filename, 3983 source->drv->format_name, 3984 NULL, size, flags, false, &local_err); 3985 break; 3986 default: 3987 abort(); 3988 } 3989 } 3990 3991 if (local_err) { 3992 error_propagate(errp, local_err); 3993 goto out; 3994 } 3995 3996 options = qdict_new(); 3997 if (arg->has_node_name) { 3998 qdict_put_str(options, "node-name", arg->node_name); 3999 } 4000 if (format) { 4001 qdict_put_str(options, "driver", format); 4002 } 4003 4004 /* Mirroring takes care of copy-on-write using the source's backing 4005 * file. 4006 */ 4007 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 4008 if (!target_bs) { 4009 goto out; 4010 } 4011 4012 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && 4013 (arg->mode == NEW_IMAGE_MODE_EXISTING || 4014 !bdrv_has_zero_init(target_bs))); 4015 4016 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 4017 if (ret < 0) { 4018 bdrv_unref(target_bs); 4019 goto out; 4020 } 4021 4022 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 4023 arg->has_replaces, arg->replaces, arg->sync, 4024 backing_mode, zero_target, 4025 arg->has_speed, arg->speed, 4026 arg->has_granularity, arg->granularity, 4027 arg->has_buf_size, arg->buf_size, 4028 arg->has_on_source_error, arg->on_source_error, 4029 arg->has_on_target_error, arg->on_target_error, 4030 arg->has_unmap, arg->unmap, 4031 false, NULL, 4032 arg->has_copy_mode, arg->copy_mode, 4033 arg->has_auto_finalize, arg->auto_finalize, 4034 arg->has_auto_dismiss, arg->auto_dismiss, 4035 &local_err); 4036 bdrv_unref(target_bs); 4037 error_propagate(errp, local_err); 4038 out: 4039 aio_context_release(aio_context); 4040 } 4041 4042 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 4043 const char *device, const char *target, 4044 bool has_replaces, const char *replaces, 4045 MirrorSyncMode sync, 4046 bool has_speed, int64_t speed, 4047 bool has_granularity, uint32_t granularity, 4048 bool has_buf_size, int64_t buf_size, 4049 bool has_on_source_error, 4050 BlockdevOnError on_source_error, 4051 bool has_on_target_error, 4052 BlockdevOnError on_target_error, 4053 bool has_filter_node_name, 4054 const char *filter_node_name, 4055 bool has_copy_mode, MirrorCopyMode copy_mode, 4056 bool has_auto_finalize, bool auto_finalize, 4057 bool has_auto_dismiss, bool auto_dismiss, 4058 Error **errp) 4059 { 4060 BlockDriverState *bs; 4061 BlockDriverState *target_bs; 4062 AioContext *aio_context; 4063 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 4064 Error *local_err = NULL; 4065 bool zero_target; 4066 int ret; 4067 4068 bs = qmp_get_root_bs(device, errp); 4069 if (!bs) { 4070 return; 4071 } 4072 4073 target_bs = bdrv_lookup_bs(target, target, errp); 4074 if (!target_bs) { 4075 return; 4076 } 4077 4078 zero_target = (sync == MIRROR_SYNC_MODE_FULL); 4079 4080 aio_context = bdrv_get_aio_context(bs); 4081 aio_context_acquire(aio_context); 4082 4083 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 4084 if (ret < 0) { 4085 goto out; 4086 } 4087 4088 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 4089 has_replaces, replaces, sync, backing_mode, 4090 zero_target, has_speed, speed, 4091 has_granularity, granularity, 4092 has_buf_size, buf_size, 4093 has_on_source_error, on_source_error, 4094 has_on_target_error, on_target_error, 4095 true, true, 4096 has_filter_node_name, filter_node_name, 4097 has_copy_mode, copy_mode, 4098 has_auto_finalize, auto_finalize, 4099 has_auto_dismiss, auto_dismiss, 4100 &local_err); 4101 error_propagate(errp, local_err); 4102 out: 4103 aio_context_release(aio_context); 4104 } 4105 4106 /* Get a block job using its ID and acquire its AioContext */ 4107 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 4108 Error **errp) 4109 { 4110 BlockJob *job; 4111 4112 assert(id != NULL); 4113 4114 *aio_context = NULL; 4115 4116 job = block_job_get(id); 4117 4118 if (!job) { 4119 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4120 "Block job '%s' not found", id); 4121 return NULL; 4122 } 4123 4124 *aio_context = blk_get_aio_context(job->blk); 4125 aio_context_acquire(*aio_context); 4126 4127 return job; 4128 } 4129 4130 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4131 { 4132 AioContext *aio_context; 4133 BlockJob *job = find_block_job(device, &aio_context, errp); 4134 4135 if (!job) { 4136 return; 4137 } 4138 4139 block_job_set_speed(job, speed, errp); 4140 aio_context_release(aio_context); 4141 } 4142 4143 void qmp_block_job_cancel(const char *device, 4144 bool has_force, bool force, Error **errp) 4145 { 4146 AioContext *aio_context; 4147 BlockJob *job = find_block_job(device, &aio_context, errp); 4148 4149 if (!job) { 4150 return; 4151 } 4152 4153 if (!has_force) { 4154 force = false; 4155 } 4156 4157 if (job_user_paused(&job->job) && !force) { 4158 error_setg(errp, "The block job for device '%s' is currently paused", 4159 device); 4160 goto out; 4161 } 4162 4163 trace_qmp_block_job_cancel(job); 4164 job_user_cancel(&job->job, force, errp); 4165 out: 4166 aio_context_release(aio_context); 4167 } 4168 4169 void qmp_block_job_pause(const char *device, Error **errp) 4170 { 4171 AioContext *aio_context; 4172 BlockJob *job = find_block_job(device, &aio_context, errp); 4173 4174 if (!job) { 4175 return; 4176 } 4177 4178 trace_qmp_block_job_pause(job); 4179 job_user_pause(&job->job, errp); 4180 aio_context_release(aio_context); 4181 } 4182 4183 void qmp_block_job_resume(const char *device, Error **errp) 4184 { 4185 AioContext *aio_context; 4186 BlockJob *job = find_block_job(device, &aio_context, errp); 4187 4188 if (!job) { 4189 return; 4190 } 4191 4192 trace_qmp_block_job_resume(job); 4193 job_user_resume(&job->job, errp); 4194 aio_context_release(aio_context); 4195 } 4196 4197 void qmp_block_job_complete(const char *device, Error **errp) 4198 { 4199 AioContext *aio_context; 4200 BlockJob *job = find_block_job(device, &aio_context, errp); 4201 4202 if (!job) { 4203 return; 4204 } 4205 4206 trace_qmp_block_job_complete(job); 4207 job_complete(&job->job, errp); 4208 aio_context_release(aio_context); 4209 } 4210 4211 void qmp_block_job_finalize(const char *id, Error **errp) 4212 { 4213 AioContext *aio_context; 4214 BlockJob *job = find_block_job(id, &aio_context, errp); 4215 4216 if (!job) { 4217 return; 4218 } 4219 4220 trace_qmp_block_job_finalize(job); 4221 job_finalize(&job->job, errp); 4222 aio_context_release(aio_context); 4223 } 4224 4225 void qmp_block_job_dismiss(const char *id, Error **errp) 4226 { 4227 AioContext *aio_context; 4228 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4229 Job *job; 4230 4231 if (!bjob) { 4232 return; 4233 } 4234 4235 trace_qmp_block_job_dismiss(bjob); 4236 job = &bjob->job; 4237 job_dismiss(&job, errp); 4238 aio_context_release(aio_context); 4239 } 4240 4241 void qmp_change_backing_file(const char *device, 4242 const char *image_node_name, 4243 const char *backing_file, 4244 Error **errp) 4245 { 4246 BlockDriverState *bs = NULL; 4247 AioContext *aio_context; 4248 BlockDriverState *image_bs = NULL; 4249 Error *local_err = NULL; 4250 bool ro; 4251 int ret; 4252 4253 bs = qmp_get_root_bs(device, errp); 4254 if (!bs) { 4255 return; 4256 } 4257 4258 aio_context = bdrv_get_aio_context(bs); 4259 aio_context_acquire(aio_context); 4260 4261 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4262 if (local_err) { 4263 error_propagate(errp, local_err); 4264 goto out; 4265 } 4266 4267 if (!image_bs) { 4268 error_setg(errp, "image file not found"); 4269 goto out; 4270 } 4271 4272 if (bdrv_find_base(image_bs) == image_bs) { 4273 error_setg(errp, "not allowing backing file change on an image " 4274 "without a backing file"); 4275 goto out; 4276 } 4277 4278 /* even though we are not necessarily operating on bs, we need it to 4279 * determine if block ops are currently prohibited on the chain */ 4280 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4281 goto out; 4282 } 4283 4284 /* final sanity check */ 4285 if (!bdrv_chain_contains(bs, image_bs)) { 4286 error_setg(errp, "'%s' and image file are not in the same chain", 4287 device); 4288 goto out; 4289 } 4290 4291 /* if not r/w, reopen to make r/w */ 4292 ro = bdrv_is_read_only(image_bs); 4293 4294 if (ro) { 4295 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4296 goto out; 4297 } 4298 } 4299 4300 ret = bdrv_change_backing_file(image_bs, backing_file, 4301 image_bs->drv ? image_bs->drv->format_name : ""); 4302 4303 if (ret < 0) { 4304 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4305 backing_file); 4306 /* don't exit here, so we can try to restore open flags if 4307 * appropriate */ 4308 } 4309 4310 if (ro) { 4311 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4312 error_propagate(errp, local_err); 4313 } 4314 4315 out: 4316 aio_context_release(aio_context); 4317 } 4318 4319 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4320 { 4321 QemuOpts *opts; 4322 QDict *qdict; 4323 Error *local_err = NULL; 4324 4325 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4326 if (!opts) { 4327 return; 4328 } 4329 4330 qdict = qemu_opts_to_qdict(opts, NULL); 4331 4332 if (!qdict_get_try_str(qdict, "node-name")) { 4333 qobject_unref(qdict); 4334 error_report("'node-name' needs to be specified"); 4335 goto out; 4336 } 4337 4338 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4339 if (!bs) { 4340 error_report_err(local_err); 4341 goto out; 4342 } 4343 4344 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4345 4346 out: 4347 qemu_opts_del(opts); 4348 } 4349 4350 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4351 { 4352 BlockDriverState *bs; 4353 QObject *obj; 4354 Visitor *v = qobject_output_visitor_new(&obj); 4355 QDict *qdict; 4356 Error *local_err = NULL; 4357 4358 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4359 if (local_err) { 4360 error_propagate(errp, local_err); 4361 goto fail; 4362 } 4363 4364 visit_complete(v, &obj); 4365 qdict = qobject_to(QDict, obj); 4366 4367 qdict_flatten(qdict); 4368 4369 if (!qdict_get_try_str(qdict, "node-name")) { 4370 error_setg(errp, "'node-name' must be specified for the root node"); 4371 goto fail; 4372 } 4373 4374 bs = bds_tree_init(qdict, errp); 4375 if (!bs) { 4376 goto fail; 4377 } 4378 4379 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4380 4381 fail: 4382 visit_free(v); 4383 } 4384 4385 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4386 { 4387 BlockDriverState *bs; 4388 AioContext *ctx; 4389 QObject *obj; 4390 Visitor *v = qobject_output_visitor_new(&obj); 4391 Error *local_err = NULL; 4392 BlockReopenQueue *queue; 4393 QDict *qdict; 4394 4395 /* Check for the selected node name */ 4396 if (!options->has_node_name) { 4397 error_setg(errp, "Node name not specified"); 4398 goto fail; 4399 } 4400 4401 bs = bdrv_find_node(options->node_name); 4402 if (!bs) { 4403 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4404 goto fail; 4405 } 4406 4407 /* Put all options in a QDict and flatten it */ 4408 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4409 if (local_err) { 4410 error_propagate(errp, local_err); 4411 goto fail; 4412 } 4413 4414 visit_complete(v, &obj); 4415 qdict = qobject_to(QDict, obj); 4416 4417 qdict_flatten(qdict); 4418 4419 /* Perform the reopen operation */ 4420 ctx = bdrv_get_aio_context(bs); 4421 aio_context_acquire(ctx); 4422 bdrv_subtree_drained_begin(bs); 4423 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4424 bdrv_reopen_multiple(queue, errp); 4425 bdrv_subtree_drained_end(bs); 4426 aio_context_release(ctx); 4427 4428 fail: 4429 visit_free(v); 4430 } 4431 4432 void qmp_blockdev_del(const char *node_name, Error **errp) 4433 { 4434 AioContext *aio_context; 4435 BlockDriverState *bs; 4436 4437 bs = bdrv_find_node(node_name); 4438 if (!bs) { 4439 error_setg(errp, "Cannot find node %s", node_name); 4440 return; 4441 } 4442 if (bdrv_has_blk(bs)) { 4443 error_setg(errp, "Node %s is in use", node_name); 4444 return; 4445 } 4446 aio_context = bdrv_get_aio_context(bs); 4447 aio_context_acquire(aio_context); 4448 4449 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4450 goto out; 4451 } 4452 4453 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4454 error_setg(errp, "Node %s is not owned by the monitor", 4455 bs->node_name); 4456 goto out; 4457 } 4458 4459 if (bs->refcnt > 1) { 4460 error_setg(errp, "Block device %s is in use", 4461 bdrv_get_device_or_node_name(bs)); 4462 goto out; 4463 } 4464 4465 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4466 bdrv_unref(bs); 4467 4468 out: 4469 aio_context_release(aio_context); 4470 } 4471 4472 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4473 const char *child_name) 4474 { 4475 BdrvChild *child; 4476 4477 QLIST_FOREACH(child, &parent_bs->children, next) { 4478 if (strcmp(child->name, child_name) == 0) { 4479 return child; 4480 } 4481 } 4482 4483 return NULL; 4484 } 4485 4486 void qmp_x_blockdev_change(const char *parent, bool has_child, 4487 const char *child, bool has_node, 4488 const char *node, Error **errp) 4489 { 4490 BlockDriverState *parent_bs, *new_bs = NULL; 4491 BdrvChild *p_child; 4492 4493 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4494 if (!parent_bs) { 4495 return; 4496 } 4497 4498 if (has_child == has_node) { 4499 if (has_child) { 4500 error_setg(errp, "The parameters child and node are in conflict"); 4501 } else { 4502 error_setg(errp, "Either child or node must be specified"); 4503 } 4504 return; 4505 } 4506 4507 if (has_child) { 4508 p_child = bdrv_find_child(parent_bs, child); 4509 if (!p_child) { 4510 error_setg(errp, "Node '%s' does not have child '%s'", 4511 parent, child); 4512 return; 4513 } 4514 bdrv_del_child(parent_bs, p_child, errp); 4515 } 4516 4517 if (has_node) { 4518 new_bs = bdrv_find_node(node); 4519 if (!new_bs) { 4520 error_setg(errp, "Node '%s' not found", node); 4521 return; 4522 } 4523 bdrv_add_child(parent_bs, new_bs, errp); 4524 } 4525 } 4526 4527 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4528 { 4529 BlockJobInfoList *head = NULL, **p_next = &head; 4530 BlockJob *job; 4531 4532 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4533 BlockJobInfoList *elem; 4534 AioContext *aio_context; 4535 4536 if (block_job_is_internal(job)) { 4537 continue; 4538 } 4539 elem = g_new0(BlockJobInfoList, 1); 4540 aio_context = blk_get_aio_context(job->blk); 4541 aio_context_acquire(aio_context); 4542 elem->value = block_job_query(job, errp); 4543 aio_context_release(aio_context); 4544 if (!elem->value) { 4545 g_free(elem); 4546 qapi_free_BlockJobInfoList(head); 4547 return NULL; 4548 } 4549 *p_next = elem; 4550 p_next = &elem->next; 4551 } 4552 4553 return head; 4554 } 4555 4556 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4557 bool has_force, bool force, Error **errp) 4558 { 4559 AioContext *old_context; 4560 AioContext *new_context; 4561 BlockDriverState *bs; 4562 4563 bs = bdrv_find_node(node_name); 4564 if (!bs) { 4565 error_setg(errp, "Cannot find node %s", node_name); 4566 return; 4567 } 4568 4569 /* Protects against accidents. */ 4570 if (!(has_force && force) && bdrv_has_blk(bs)) { 4571 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4572 "be in use (use force=true to override this check)", 4573 node_name); 4574 return; 4575 } 4576 4577 if (iothread->type == QTYPE_QSTRING) { 4578 IOThread *obj = iothread_by_id(iothread->u.s); 4579 if (!obj) { 4580 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4581 return; 4582 } 4583 4584 new_context = iothread_get_aio_context(obj); 4585 } else { 4586 new_context = qemu_get_aio_context(); 4587 } 4588 4589 old_context = bdrv_get_aio_context(bs); 4590 aio_context_acquire(old_context); 4591 4592 bdrv_try_set_aio_context(bs, new_context, errp); 4593 4594 aio_context_release(old_context); 4595 } 4596 4597 void qmp_block_latency_histogram_set( 4598 const char *id, 4599 bool has_boundaries, uint64List *boundaries, 4600 bool has_boundaries_read, uint64List *boundaries_read, 4601 bool has_boundaries_write, uint64List *boundaries_write, 4602 bool has_boundaries_flush, uint64List *boundaries_flush, 4603 Error **errp) 4604 { 4605 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4606 BlockAcctStats *stats; 4607 int ret; 4608 4609 if (!blk) { 4610 return; 4611 } 4612 4613 stats = blk_get_stats(blk); 4614 4615 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4616 !has_boundaries_flush) 4617 { 4618 block_latency_histograms_clear(stats); 4619 return; 4620 } 4621 4622 if (has_boundaries || has_boundaries_read) { 4623 ret = block_latency_histogram_set( 4624 stats, BLOCK_ACCT_READ, 4625 has_boundaries_read ? boundaries_read : boundaries); 4626 if (ret) { 4627 error_setg(errp, "Device '%s' set read boundaries fail", id); 4628 return; 4629 } 4630 } 4631 4632 if (has_boundaries || has_boundaries_write) { 4633 ret = block_latency_histogram_set( 4634 stats, BLOCK_ACCT_WRITE, 4635 has_boundaries_write ? boundaries_write : boundaries); 4636 if (ret) { 4637 error_setg(errp, "Device '%s' set write boundaries fail", id); 4638 return; 4639 } 4640 } 4641 4642 if (has_boundaries || has_boundaries_flush) { 4643 ret = block_latency_histogram_set( 4644 stats, BLOCK_ACCT_FLUSH, 4645 has_boundaries_flush ? boundaries_flush : boundaries); 4646 if (ret) { 4647 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4648 return; 4649 } 4650 } 4651 } 4652 4653 QemuOptsList qemu_common_drive_opts = { 4654 .name = "drive", 4655 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4656 .desc = { 4657 { 4658 .name = "snapshot", 4659 .type = QEMU_OPT_BOOL, 4660 .help = "enable/disable snapshot mode", 4661 },{ 4662 .name = "aio", 4663 .type = QEMU_OPT_STRING, 4664 .help = "host AIO implementation (threads, native)", 4665 },{ 4666 .name = BDRV_OPT_CACHE_WB, 4667 .type = QEMU_OPT_BOOL, 4668 .help = "Enable writeback mode", 4669 },{ 4670 .name = "format", 4671 .type = QEMU_OPT_STRING, 4672 .help = "disk format (raw, qcow2, ...)", 4673 },{ 4674 .name = "rerror", 4675 .type = QEMU_OPT_STRING, 4676 .help = "read error action", 4677 },{ 4678 .name = "werror", 4679 .type = QEMU_OPT_STRING, 4680 .help = "write error action", 4681 },{ 4682 .name = BDRV_OPT_READ_ONLY, 4683 .type = QEMU_OPT_BOOL, 4684 .help = "open drive file as read-only", 4685 }, 4686 4687 THROTTLE_OPTS, 4688 4689 { 4690 .name = "throttling.group", 4691 .type = QEMU_OPT_STRING, 4692 .help = "name of the block throttling group", 4693 },{ 4694 .name = "copy-on-read", 4695 .type = QEMU_OPT_BOOL, 4696 .help = "copy read data from backing file into image file", 4697 },{ 4698 .name = "detect-zeroes", 4699 .type = QEMU_OPT_STRING, 4700 .help = "try to optimize zero writes (off, on, unmap)", 4701 },{ 4702 .name = "stats-account-invalid", 4703 .type = QEMU_OPT_BOOL, 4704 .help = "whether to account for invalid I/O operations " 4705 "in the statistics", 4706 },{ 4707 .name = "stats-account-failed", 4708 .type = QEMU_OPT_BOOL, 4709 .help = "whether to account for failed I/O operations " 4710 "in the statistics", 4711 }, 4712 { /* end of list */ } 4713 }, 4714 }; 4715 4716 QemuOptsList qemu_drive_opts = { 4717 .name = "drive", 4718 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4719 .desc = { 4720 /* 4721 * no elements => accept any params 4722 * validation will happen later 4723 */ 4724 { /* end of list */ } 4725 }, 4726 }; 4727