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 "qemu/cutils.h" 62 #include "qemu/help_option.h" 63 #include "qemu/throttle-options.h" 64 65 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 66 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 67 68 static int do_open_tray(const char *blk_name, const char *qdev_id, 69 bool force, Error **errp); 70 static void blockdev_remove_medium(bool has_device, const char *device, 71 bool has_id, const char *id, Error **errp); 72 static void blockdev_insert_medium(bool has_device, const char *device, 73 bool has_id, const char *id, 74 const char *node_name, Error **errp); 75 76 static const char *const if_name[IF_COUNT] = { 77 [IF_NONE] = "none", 78 [IF_IDE] = "ide", 79 [IF_SCSI] = "scsi", 80 [IF_FLOPPY] = "floppy", 81 [IF_PFLASH] = "pflash", 82 [IF_MTD] = "mtd", 83 [IF_SD] = "sd", 84 [IF_VIRTIO] = "virtio", 85 [IF_XEN] = "xen", 86 }; 87 88 static int if_max_devs[IF_COUNT] = { 89 /* 90 * Do not change these numbers! They govern how drive option 91 * index maps to unit and bus. That mapping is ABI. 92 * 93 * All controllers used to implement if=T drives need to support 94 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 95 * Otherwise, some index values map to "impossible" bus, unit 96 * values. 97 * 98 * For instance, if you change [IF_SCSI] to 255, -drive 99 * if=scsi,index=12 no longer means bus=1,unit=5, but 100 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 101 * the drive can't be set up. Regression. 102 */ 103 [IF_IDE] = 2, 104 [IF_SCSI] = 7, 105 }; 106 107 /** 108 * Boards may call this to offer board-by-board overrides 109 * of the default, global values. 110 */ 111 void override_max_devs(BlockInterfaceType type, int max_devs) 112 { 113 BlockBackend *blk; 114 DriveInfo *dinfo; 115 116 if (max_devs <= 0) { 117 return; 118 } 119 120 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 121 dinfo = blk_legacy_dinfo(blk); 122 if (dinfo->type == type) { 123 fprintf(stderr, "Cannot override units-per-bus property of" 124 " the %s interface, because a drive of that type has" 125 " already been added.\n", if_name[type]); 126 g_assert_not_reached(); 127 } 128 } 129 130 if_max_devs[type] = max_devs; 131 } 132 133 /* 134 * We automatically delete the drive when a device using it gets 135 * unplugged. Questionable feature, but we can't just drop it. 136 * Device models call blockdev_mark_auto_del() to schedule the 137 * automatic deletion, and generic qdev code calls blockdev_auto_del() 138 * when deletion is actually safe. 139 */ 140 void blockdev_mark_auto_del(BlockBackend *blk) 141 { 142 DriveInfo *dinfo = blk_legacy_dinfo(blk); 143 BlockJob *job; 144 145 if (!dinfo) { 146 return; 147 } 148 149 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 150 if (block_job_has_bdrv(job, blk_bs(blk))) { 151 AioContext *aio_context = job->job.aio_context; 152 aio_context_acquire(aio_context); 153 154 job_cancel(&job->job, false); 155 156 aio_context_release(aio_context); 157 } 158 } 159 160 dinfo->auto_del = 1; 161 } 162 163 void blockdev_auto_del(BlockBackend *blk) 164 { 165 DriveInfo *dinfo = blk_legacy_dinfo(blk); 166 167 if (dinfo && dinfo->auto_del) { 168 monitor_remove_blk(blk); 169 blk_unref(blk); 170 } 171 } 172 173 /** 174 * Returns the current mapping of how many units per bus 175 * a particular interface can support. 176 * 177 * A positive integer indicates n units per bus. 178 * 0 implies the mapping has not been established. 179 * -1 indicates an invalid BlockInterfaceType was given. 180 */ 181 int drive_get_max_devs(BlockInterfaceType type) 182 { 183 if (type >= IF_IDE && type < IF_COUNT) { 184 return if_max_devs[type]; 185 } 186 187 return -1; 188 } 189 190 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 191 { 192 int max_devs = if_max_devs[type]; 193 return max_devs ? index / max_devs : 0; 194 } 195 196 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 197 { 198 int max_devs = if_max_devs[type]; 199 return max_devs ? index % max_devs : index; 200 } 201 202 QemuOpts *drive_def(const char *optstr) 203 { 204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 205 } 206 207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 208 const char *optstr) 209 { 210 QemuOpts *opts; 211 212 opts = drive_def(optstr); 213 if (!opts) { 214 return NULL; 215 } 216 if (type != IF_DEFAULT) { 217 qemu_opt_set(opts, "if", if_name[type], &error_abort); 218 } 219 if (index >= 0) { 220 qemu_opt_set_number(opts, "index", index, &error_abort); 221 } 222 if (file) 223 qemu_opt_set(opts, "file", file, &error_abort); 224 return opts; 225 } 226 227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 228 { 229 BlockBackend *blk; 230 DriveInfo *dinfo; 231 232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 233 dinfo = blk_legacy_dinfo(blk); 234 if (dinfo && dinfo->type == type 235 && dinfo->bus == bus && dinfo->unit == unit) { 236 return dinfo; 237 } 238 } 239 240 return NULL; 241 } 242 243 void drive_check_orphaned(void) 244 { 245 BlockBackend *blk; 246 DriveInfo *dinfo; 247 Location loc; 248 bool orphans = false; 249 250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 251 dinfo = blk_legacy_dinfo(blk); 252 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 253 dinfo->type != IF_NONE) { 254 loc_push_none(&loc); 255 qemu_opts_loc_restore(dinfo->opts); 256 error_report("machine type does not support" 257 " if=%s,bus=%d,unit=%d", 258 if_name[dinfo->type], dinfo->bus, dinfo->unit); 259 loc_pop(&loc); 260 orphans = true; 261 } 262 } 263 264 if (orphans) { 265 exit(1); 266 } 267 } 268 269 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 270 { 271 return drive_get(type, 272 drive_index_to_bus_id(type, index), 273 drive_index_to_unit_id(type, index)); 274 } 275 276 int drive_get_max_bus(BlockInterfaceType type) 277 { 278 int max_bus; 279 BlockBackend *blk; 280 DriveInfo *dinfo; 281 282 max_bus = -1; 283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 284 dinfo = blk_legacy_dinfo(blk); 285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 286 max_bus = dinfo->bus; 287 } 288 } 289 return max_bus; 290 } 291 292 /* Get a block device. This should only be used for single-drive devices 293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 294 appropriate bus. */ 295 DriveInfo *drive_get_next(BlockInterfaceType type) 296 { 297 static int next_block_unit[IF_COUNT]; 298 299 return drive_get(type, 0, next_block_unit[type]++); 300 } 301 302 static void bdrv_format_print(void *opaque, const char *name) 303 { 304 qemu_printf(" %s", name); 305 } 306 307 typedef struct { 308 QEMUBH *bh; 309 BlockDriverState *bs; 310 } BDRVPutRefBH; 311 312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 313 { 314 if (!strcmp(buf, "ignore")) { 315 return BLOCKDEV_ON_ERROR_IGNORE; 316 } else if (!is_read && !strcmp(buf, "enospc")) { 317 return BLOCKDEV_ON_ERROR_ENOSPC; 318 } else if (!strcmp(buf, "stop")) { 319 return BLOCKDEV_ON_ERROR_STOP; 320 } else if (!strcmp(buf, "report")) { 321 return BLOCKDEV_ON_ERROR_REPORT; 322 } else { 323 error_setg(errp, "'%s' invalid %s error action", 324 buf, is_read ? "read" : "write"); 325 return -1; 326 } 327 } 328 329 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 330 Error **errp) 331 { 332 const QListEntry *entry; 333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 334 switch (qobject_type(entry->value)) { 335 336 case QTYPE_QSTRING: { 337 unsigned long long length; 338 const char *str = qstring_get_str(qobject_to(QString, 339 entry->value)); 340 if (parse_uint_full(str, &length, 10) == 0 && 341 length > 0 && length <= UINT_MAX) { 342 block_acct_add_interval(stats, (unsigned) length); 343 } else { 344 error_setg(errp, "Invalid interval length: %s", str); 345 return false; 346 } 347 break; 348 } 349 350 case QTYPE_QNUM: { 351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 352 353 if (length > 0 && length <= UINT_MAX) { 354 block_acct_add_interval(stats, (unsigned) length); 355 } else { 356 error_setg(errp, "Invalid interval length: %" PRId64, length); 357 return false; 358 } 359 break; 360 } 361 362 default: 363 error_setg(errp, "The specification of stats-intervals is invalid"); 364 return false; 365 } 366 } 367 return true; 368 } 369 370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 371 372 /* All parameters but @opts are optional and may be set to NULL. */ 373 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 374 const char **throttling_group, ThrottleConfig *throttle_cfg, 375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 376 { 377 Error *local_error = NULL; 378 const char *aio; 379 380 if (bdrv_flags) { 381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 382 *bdrv_flags |= BDRV_O_COPY_ON_READ; 383 } 384 385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 386 if (!strcmp(aio, "native")) { 387 *bdrv_flags |= BDRV_O_NATIVE_AIO; 388 } else if (!strcmp(aio, "threads")) { 389 /* this is the default */ 390 } else { 391 error_setg(errp, "invalid aio option"); 392 return; 393 } 394 } 395 } 396 397 /* disk I/O throttling */ 398 if (throttling_group) { 399 *throttling_group = qemu_opt_get(opts, "throttling.group"); 400 } 401 402 if (throttle_cfg) { 403 throttle_config_init(throttle_cfg); 404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 405 qemu_opt_get_number(opts, "throttling.bps-total", 0); 406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 407 qemu_opt_get_number(opts, "throttling.bps-read", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 409 qemu_opt_get_number(opts, "throttling.bps-write", 0); 410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 411 qemu_opt_get_number(opts, "throttling.iops-total", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 413 qemu_opt_get_number(opts, "throttling.iops-read", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 415 qemu_opt_get_number(opts, "throttling.iops-write", 0); 416 417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 419 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 425 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 429 430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 442 443 throttle_cfg->op_size = 444 qemu_opt_get_number(opts, "throttling.iops-size", 0); 445 446 if (!throttle_is_valid(throttle_cfg, errp)) { 447 return; 448 } 449 } 450 451 if (detect_zeroes) { 452 *detect_zeroes = 453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 454 qemu_opt_get(opts, "detect-zeroes"), 455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 456 &local_error); 457 if (local_error) { 458 error_propagate(errp, local_error); 459 return; 460 } 461 } 462 } 463 464 /* Takes the ownership of bs_opts */ 465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 466 Error **errp) 467 { 468 const char *buf; 469 int bdrv_flags = 0; 470 int on_read_error, on_write_error; 471 bool account_invalid, account_failed; 472 bool writethrough, read_only; 473 BlockBackend *blk; 474 BlockDriverState *bs; 475 ThrottleConfig cfg; 476 int snapshot = 0; 477 Error *error = NULL; 478 QemuOpts *opts; 479 QDict *interval_dict = NULL; 480 QList *interval_list = NULL; 481 const char *id; 482 BlockdevDetectZeroesOptions detect_zeroes = 483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 484 const char *throttling_group = NULL; 485 486 /* Check common options by copying from bs_opts to opts, all other options 487 * stay in bs_opts for processing by bdrv_open(). */ 488 id = qdict_get_try_str(bs_opts, "id"); 489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 490 if (error) { 491 error_propagate(errp, error); 492 goto err_no_opts; 493 } 494 495 qemu_opts_absorb_qdict(opts, bs_opts, &error); 496 if (error) { 497 error_propagate(errp, error); 498 goto early_err; 499 } 500 501 if (id) { 502 qdict_del(bs_opts, "id"); 503 } 504 505 /* extract parameters */ 506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 507 508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 510 511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 512 513 id = qemu_opts_id(opts); 514 515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 516 qdict_array_split(interval_dict, &interval_list); 517 518 if (qdict_size(interval_dict) != 0) { 519 error_setg(errp, "Invalid option stats-intervals.%s", 520 qdict_first(interval_dict)->key); 521 goto early_err; 522 } 523 524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 525 &detect_zeroes, &error); 526 if (error) { 527 error_propagate(errp, error); 528 goto early_err; 529 } 530 531 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 532 if (is_help_option(buf)) { 533 qemu_printf("Supported formats:"); 534 bdrv_iterate_format(bdrv_format_print, NULL, false); 535 qemu_printf("\nSupported formats (read-only):"); 536 bdrv_iterate_format(bdrv_format_print, NULL, true); 537 qemu_printf("\n"); 538 goto early_err; 539 } 540 541 if (qdict_haskey(bs_opts, "driver")) { 542 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 543 goto early_err; 544 } 545 qdict_put_str(bs_opts, "driver", buf); 546 } 547 548 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 549 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 550 on_write_error = parse_block_error_action(buf, 0, &error); 551 if (error) { 552 error_propagate(errp, error); 553 goto early_err; 554 } 555 } 556 557 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 558 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 559 on_read_error = parse_block_error_action(buf, 1, &error); 560 if (error) { 561 error_propagate(errp, error); 562 goto early_err; 563 } 564 } 565 566 if (snapshot) { 567 bdrv_flags |= BDRV_O_SNAPSHOT; 568 } 569 570 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 571 572 /* init */ 573 if ((!file || !*file) && !qdict_size(bs_opts)) { 574 BlockBackendRootState *blk_rs; 575 576 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 577 blk_rs = blk_get_root_state(blk); 578 blk_rs->open_flags = bdrv_flags; 579 blk_rs->read_only = read_only; 580 blk_rs->detect_zeroes = detect_zeroes; 581 582 qobject_unref(bs_opts); 583 } else { 584 if (file && !*file) { 585 file = NULL; 586 } 587 588 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 589 * with other callers) rather than what we want as the real defaults. 590 * Apply the defaults here instead. */ 591 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 593 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 594 read_only ? "on" : "off"); 595 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 596 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 597 598 if (runstate_check(RUN_STATE_INMIGRATE)) { 599 bdrv_flags |= BDRV_O_INACTIVE; 600 } 601 602 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 603 if (!blk) { 604 goto err_no_bs_opts; 605 } 606 bs = blk_bs(blk); 607 608 bs->detect_zeroes = detect_zeroes; 609 610 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 611 612 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 613 blk_unref(blk); 614 blk = NULL; 615 goto err_no_bs_opts; 616 } 617 } 618 619 /* disk I/O throttling */ 620 if (throttle_enabled(&cfg)) { 621 if (!throttling_group) { 622 throttling_group = id; 623 } 624 blk_io_limits_enable(blk, throttling_group); 625 blk_set_io_limits(blk, &cfg); 626 } 627 628 blk_set_enable_write_cache(blk, !writethrough); 629 blk_set_on_error(blk, on_read_error, on_write_error); 630 631 if (!monitor_add_blk(blk, id, errp)) { 632 blk_unref(blk); 633 blk = NULL; 634 goto err_no_bs_opts; 635 } 636 637 err_no_bs_opts: 638 qemu_opts_del(opts); 639 qobject_unref(interval_dict); 640 qobject_unref(interval_list); 641 return blk; 642 643 early_err: 644 qemu_opts_del(opts); 645 qobject_unref(interval_dict); 646 qobject_unref(interval_list); 647 err_no_opts: 648 qobject_unref(bs_opts); 649 return NULL; 650 } 651 652 /* Takes the ownership of bs_opts */ 653 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 654 { 655 int bdrv_flags = 0; 656 657 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 658 * with other callers) rather than what we want as the real defaults. 659 * Apply the defaults here instead. */ 660 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 661 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 662 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 663 664 if (runstate_check(RUN_STATE_INMIGRATE)) { 665 bdrv_flags |= BDRV_O_INACTIVE; 666 } 667 668 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 669 } 670 671 void blockdev_close_all_bdrv_states(void) 672 { 673 BlockDriverState *bs, *next_bs; 674 675 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 676 AioContext *ctx = bdrv_get_aio_context(bs); 677 678 aio_context_acquire(ctx); 679 bdrv_unref(bs); 680 aio_context_release(ctx); 681 } 682 } 683 684 /* Iterates over the list of monitor-owned BlockDriverStates */ 685 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 686 { 687 return bs ? QTAILQ_NEXT(bs, monitor_list) 688 : QTAILQ_FIRST(&monitor_bdrv_states); 689 } 690 691 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 692 Error **errp) 693 { 694 const char *value; 695 696 value = qemu_opt_get(opts, from); 697 if (value) { 698 if (qemu_opt_find(opts, to)) { 699 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 700 "same time", to, from); 701 return; 702 } 703 } 704 705 /* rename all items in opts */ 706 while ((value = qemu_opt_get(opts, from))) { 707 qemu_opt_set(opts, to, value, &error_abort); 708 qemu_opt_unset(opts, from); 709 } 710 } 711 712 QemuOptsList qemu_legacy_drive_opts = { 713 .name = "drive", 714 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 715 .desc = { 716 { 717 .name = "bus", 718 .type = QEMU_OPT_NUMBER, 719 .help = "bus number", 720 },{ 721 .name = "unit", 722 .type = QEMU_OPT_NUMBER, 723 .help = "unit number (i.e. lun for scsi)", 724 },{ 725 .name = "index", 726 .type = QEMU_OPT_NUMBER, 727 .help = "index number", 728 },{ 729 .name = "media", 730 .type = QEMU_OPT_STRING, 731 .help = "media type (disk, cdrom)", 732 },{ 733 .name = "if", 734 .type = QEMU_OPT_STRING, 735 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 736 },{ 737 .name = "file", 738 .type = QEMU_OPT_STRING, 739 .help = "file name", 740 }, 741 742 /* Options that are passed on, but have special semantics with -drive */ 743 { 744 .name = BDRV_OPT_READ_ONLY, 745 .type = QEMU_OPT_BOOL, 746 .help = "open drive file as read-only", 747 },{ 748 .name = "rerror", 749 .type = QEMU_OPT_STRING, 750 .help = "read error action", 751 },{ 752 .name = "werror", 753 .type = QEMU_OPT_STRING, 754 .help = "write error action", 755 },{ 756 .name = "copy-on-read", 757 .type = QEMU_OPT_BOOL, 758 .help = "copy read data from backing file into image file", 759 }, 760 761 { /* end of list */ } 762 }, 763 }; 764 765 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 766 Error **errp) 767 { 768 const char *value; 769 BlockBackend *blk; 770 DriveInfo *dinfo = NULL; 771 QDict *bs_opts; 772 QemuOpts *legacy_opts; 773 DriveMediaType media = MEDIA_DISK; 774 BlockInterfaceType type; 775 int max_devs, bus_id, unit_id, index; 776 const char *werror, *rerror; 777 bool read_only = false; 778 bool copy_on_read; 779 const char *filename; 780 Error *local_err = NULL; 781 int i; 782 783 /* Change legacy command line options into QMP ones */ 784 static const struct { 785 const char *from; 786 const char *to; 787 } opt_renames[] = { 788 { "iops", "throttling.iops-total" }, 789 { "iops_rd", "throttling.iops-read" }, 790 { "iops_wr", "throttling.iops-write" }, 791 792 { "bps", "throttling.bps-total" }, 793 { "bps_rd", "throttling.bps-read" }, 794 { "bps_wr", "throttling.bps-write" }, 795 796 { "iops_max", "throttling.iops-total-max" }, 797 { "iops_rd_max", "throttling.iops-read-max" }, 798 { "iops_wr_max", "throttling.iops-write-max" }, 799 800 { "bps_max", "throttling.bps-total-max" }, 801 { "bps_rd_max", "throttling.bps-read-max" }, 802 { "bps_wr_max", "throttling.bps-write-max" }, 803 804 { "iops_size", "throttling.iops-size" }, 805 806 { "group", "throttling.group" }, 807 808 { "readonly", BDRV_OPT_READ_ONLY }, 809 }; 810 811 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 812 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 813 &local_err); 814 if (local_err) { 815 error_propagate(errp, local_err); 816 return NULL; 817 } 818 } 819 820 value = qemu_opt_get(all_opts, "cache"); 821 if (value) { 822 int flags = 0; 823 bool writethrough; 824 825 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 826 error_setg(errp, "invalid cache option"); 827 return NULL; 828 } 829 830 /* Specific options take precedence */ 831 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 832 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 833 !writethrough, &error_abort); 834 } 835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 837 !!(flags & BDRV_O_NOCACHE), &error_abort); 838 } 839 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 840 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 841 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 842 } 843 qemu_opt_unset(all_opts, "cache"); 844 } 845 846 /* Get a QDict for processing the options */ 847 bs_opts = qdict_new(); 848 qemu_opts_to_qdict(all_opts, bs_opts); 849 850 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 851 &error_abort); 852 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 853 if (local_err) { 854 error_propagate(errp, local_err); 855 goto fail; 856 } 857 858 /* Media type */ 859 value = qemu_opt_get(legacy_opts, "media"); 860 if (value) { 861 if (!strcmp(value, "disk")) { 862 media = MEDIA_DISK; 863 } else if (!strcmp(value, "cdrom")) { 864 media = MEDIA_CDROM; 865 read_only = true; 866 } else { 867 error_setg(errp, "'%s' invalid media", value); 868 goto fail; 869 } 870 } 871 872 /* copy-on-read is disabled with a warning for read-only devices */ 873 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 874 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 875 876 if (read_only && copy_on_read) { 877 warn_report("disabling copy-on-read on read-only drive"); 878 copy_on_read = false; 879 } 880 881 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 882 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 883 884 /* Controller type */ 885 value = qemu_opt_get(legacy_opts, "if"); 886 if (value) { 887 for (type = 0; 888 type < IF_COUNT && strcmp(value, if_name[type]); 889 type++) { 890 } 891 if (type == IF_COUNT) { 892 error_setg(errp, "unsupported bus type '%s'", value); 893 goto fail; 894 } 895 } else { 896 type = block_default_type; 897 } 898 899 /* Device address specified by bus/unit or index. 900 * If none was specified, try to find the first free one. */ 901 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 902 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 903 index = qemu_opt_get_number(legacy_opts, "index", -1); 904 905 max_devs = if_max_devs[type]; 906 907 if (index != -1) { 908 if (bus_id != 0 || unit_id != -1) { 909 error_setg(errp, "index cannot be used with bus and unit"); 910 goto fail; 911 } 912 bus_id = drive_index_to_bus_id(type, index); 913 unit_id = drive_index_to_unit_id(type, index); 914 } 915 916 if (unit_id == -1) { 917 unit_id = 0; 918 while (drive_get(type, bus_id, unit_id) != NULL) { 919 unit_id++; 920 if (max_devs && unit_id >= max_devs) { 921 unit_id -= max_devs; 922 bus_id++; 923 } 924 } 925 } 926 927 if (max_devs && unit_id >= max_devs) { 928 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 929 goto fail; 930 } 931 932 if (drive_get(type, bus_id, unit_id) != NULL) { 933 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 934 bus_id, unit_id, index); 935 goto fail; 936 } 937 938 /* no id supplied -> create one */ 939 if (qemu_opts_id(all_opts) == NULL) { 940 char *new_id; 941 const char *mediastr = ""; 942 if (type == IF_IDE || type == IF_SCSI) { 943 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 944 } 945 if (max_devs) { 946 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 947 mediastr, unit_id); 948 } else { 949 new_id = g_strdup_printf("%s%s%i", if_name[type], 950 mediastr, unit_id); 951 } 952 qdict_put_str(bs_opts, "id", new_id); 953 g_free(new_id); 954 } 955 956 /* Add virtio block device */ 957 if (type == IF_VIRTIO) { 958 QemuOpts *devopts; 959 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 960 &error_abort); 961 if (arch_type == QEMU_ARCH_S390X) { 962 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 963 } else { 964 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 965 } 966 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 967 &error_abort); 968 } 969 970 filename = qemu_opt_get(legacy_opts, "file"); 971 972 /* Check werror/rerror compatibility with if=... */ 973 werror = qemu_opt_get(legacy_opts, "werror"); 974 if (werror != NULL) { 975 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 976 type != IF_NONE) { 977 error_setg(errp, "werror is not supported by this bus type"); 978 goto fail; 979 } 980 qdict_put_str(bs_opts, "werror", werror); 981 } 982 983 rerror = qemu_opt_get(legacy_opts, "rerror"); 984 if (rerror != NULL) { 985 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 986 type != IF_NONE) { 987 error_setg(errp, "rerror is not supported by this bus type"); 988 goto fail; 989 } 990 qdict_put_str(bs_opts, "rerror", rerror); 991 } 992 993 /* Actual block device init: Functionality shared with blockdev-add */ 994 blk = blockdev_init(filename, bs_opts, &local_err); 995 bs_opts = NULL; 996 if (!blk) { 997 error_propagate(errp, local_err); 998 goto fail; 999 } else { 1000 assert(!local_err); 1001 } 1002 1003 /* Create legacy DriveInfo */ 1004 dinfo = g_malloc0(sizeof(*dinfo)); 1005 dinfo->opts = all_opts; 1006 1007 dinfo->type = type; 1008 dinfo->bus = bus_id; 1009 dinfo->unit = unit_id; 1010 1011 blk_set_legacy_dinfo(blk, dinfo); 1012 1013 switch(type) { 1014 case IF_IDE: 1015 case IF_SCSI: 1016 case IF_XEN: 1017 case IF_NONE: 1018 dinfo->media_cd = media == MEDIA_CDROM; 1019 break; 1020 default: 1021 break; 1022 } 1023 1024 fail: 1025 qemu_opts_del(legacy_opts); 1026 qobject_unref(bs_opts); 1027 return dinfo; 1028 } 1029 1030 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1031 { 1032 BlockDriverState *bs; 1033 1034 bs = bdrv_lookup_bs(name, name, errp); 1035 if (bs == NULL) { 1036 return NULL; 1037 } 1038 1039 if (!bdrv_is_root_node(bs)) { 1040 error_setg(errp, "Need a root block node"); 1041 return NULL; 1042 } 1043 1044 if (!bdrv_is_inserted(bs)) { 1045 error_setg(errp, "Device has no medium"); 1046 return NULL; 1047 } 1048 1049 return bs; 1050 } 1051 1052 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1053 Error **errp) 1054 { 1055 BlockBackend *blk; 1056 1057 if (!blk_name == !qdev_id) { 1058 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1059 return NULL; 1060 } 1061 1062 if (qdev_id) { 1063 blk = blk_by_qdev_id(qdev_id, errp); 1064 } else { 1065 blk = blk_by_name(blk_name); 1066 if (blk == NULL) { 1067 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1068 "Device '%s' not found", blk_name); 1069 } 1070 } 1071 1072 return blk; 1073 } 1074 1075 void hmp_commit(Monitor *mon, const QDict *qdict) 1076 { 1077 const char *device = qdict_get_str(qdict, "device"); 1078 BlockBackend *blk; 1079 int ret; 1080 1081 if (!strcmp(device, "all")) { 1082 ret = blk_commit_all(); 1083 } else { 1084 BlockDriverState *bs; 1085 AioContext *aio_context; 1086 1087 blk = blk_by_name(device); 1088 if (!blk) { 1089 monitor_printf(mon, "Device '%s' not found\n", device); 1090 return; 1091 } 1092 if (!blk_is_available(blk)) { 1093 monitor_printf(mon, "Device '%s' has no medium\n", device); 1094 return; 1095 } 1096 1097 bs = blk_bs(blk); 1098 aio_context = bdrv_get_aio_context(bs); 1099 aio_context_acquire(aio_context); 1100 1101 ret = bdrv_commit(bs); 1102 1103 aio_context_release(aio_context); 1104 } 1105 if (ret < 0) { 1106 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1107 strerror(-ret)); 1108 } 1109 } 1110 1111 static void blockdev_do_action(TransactionAction *action, Error **errp) 1112 { 1113 TransactionActionList list; 1114 1115 list.value = action; 1116 list.next = NULL; 1117 qmp_transaction(&list, false, NULL, errp); 1118 } 1119 1120 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1121 bool has_node_name, const char *node_name, 1122 const char *snapshot_file, 1123 bool has_snapshot_node_name, 1124 const char *snapshot_node_name, 1125 bool has_format, const char *format, 1126 bool has_mode, NewImageMode mode, Error **errp) 1127 { 1128 BlockdevSnapshotSync snapshot = { 1129 .has_device = has_device, 1130 .device = (char *) device, 1131 .has_node_name = has_node_name, 1132 .node_name = (char *) node_name, 1133 .snapshot_file = (char *) snapshot_file, 1134 .has_snapshot_node_name = has_snapshot_node_name, 1135 .snapshot_node_name = (char *) snapshot_node_name, 1136 .has_format = has_format, 1137 .format = (char *) format, 1138 .has_mode = has_mode, 1139 .mode = mode, 1140 }; 1141 TransactionAction action = { 1142 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1143 .u.blockdev_snapshot_sync.data = &snapshot, 1144 }; 1145 blockdev_do_action(&action, errp); 1146 } 1147 1148 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1149 Error **errp) 1150 { 1151 BlockdevSnapshot snapshot_data = { 1152 .node = (char *) node, 1153 .overlay = (char *) overlay 1154 }; 1155 TransactionAction action = { 1156 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1157 .u.blockdev_snapshot.data = &snapshot_data, 1158 }; 1159 blockdev_do_action(&action, errp); 1160 } 1161 1162 void qmp_blockdev_snapshot_internal_sync(const char *device, 1163 const char *name, 1164 Error **errp) 1165 { 1166 BlockdevSnapshotInternal snapshot = { 1167 .device = (char *) device, 1168 .name = (char *) name 1169 }; 1170 TransactionAction action = { 1171 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1172 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1173 }; 1174 blockdev_do_action(&action, errp); 1175 } 1176 1177 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1178 bool has_id, 1179 const char *id, 1180 bool has_name, 1181 const char *name, 1182 Error **errp) 1183 { 1184 BlockDriverState *bs; 1185 AioContext *aio_context; 1186 QEMUSnapshotInfo sn; 1187 Error *local_err = NULL; 1188 SnapshotInfo *info = NULL; 1189 int ret; 1190 1191 bs = qmp_get_root_bs(device, errp); 1192 if (!bs) { 1193 return NULL; 1194 } 1195 aio_context = bdrv_get_aio_context(bs); 1196 aio_context_acquire(aio_context); 1197 1198 if (!has_id) { 1199 id = NULL; 1200 } 1201 1202 if (!has_name) { 1203 name = NULL; 1204 } 1205 1206 if (!id && !name) { 1207 error_setg(errp, "Name or id must be provided"); 1208 goto out_aio_context; 1209 } 1210 1211 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1212 goto out_aio_context; 1213 } 1214 1215 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1216 if (local_err) { 1217 error_propagate(errp, local_err); 1218 goto out_aio_context; 1219 } 1220 if (!ret) { 1221 error_setg(errp, 1222 "Snapshot with id '%s' and name '%s' does not exist on " 1223 "device '%s'", 1224 STR_OR_NULL(id), STR_OR_NULL(name), device); 1225 goto out_aio_context; 1226 } 1227 1228 bdrv_snapshot_delete(bs, id, name, &local_err); 1229 if (local_err) { 1230 error_propagate(errp, local_err); 1231 goto out_aio_context; 1232 } 1233 1234 aio_context_release(aio_context); 1235 1236 info = g_new0(SnapshotInfo, 1); 1237 info->id = g_strdup(sn.id_str); 1238 info->name = g_strdup(sn.name); 1239 info->date_nsec = sn.date_nsec; 1240 info->date_sec = sn.date_sec; 1241 info->vm_state_size = sn.vm_state_size; 1242 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1243 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1244 1245 return info; 1246 1247 out_aio_context: 1248 aio_context_release(aio_context); 1249 return NULL; 1250 } 1251 1252 /** 1253 * block_dirty_bitmap_lookup: 1254 * Return a dirty bitmap (if present), after validating 1255 * the node reference and bitmap names. 1256 * 1257 * @node: The name of the BDS node to search for bitmaps 1258 * @name: The name of the bitmap to search for 1259 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1260 * @errp: Output pointer for error information. Can be NULL. 1261 * 1262 * @return: A bitmap object on success, or NULL on failure. 1263 */ 1264 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1265 const char *name, 1266 BlockDriverState **pbs, 1267 Error **errp) 1268 { 1269 BlockDriverState *bs; 1270 BdrvDirtyBitmap *bitmap; 1271 1272 if (!node) { 1273 error_setg(errp, "Node cannot be NULL"); 1274 return NULL; 1275 } 1276 if (!name) { 1277 error_setg(errp, "Bitmap name cannot be NULL"); 1278 return NULL; 1279 } 1280 bs = bdrv_lookup_bs(node, node, NULL); 1281 if (!bs) { 1282 error_setg(errp, "Node '%s' not found", node); 1283 return NULL; 1284 } 1285 1286 bitmap = bdrv_find_dirty_bitmap(bs, name); 1287 if (!bitmap) { 1288 error_setg(errp, "Dirty bitmap '%s' not found", name); 1289 return NULL; 1290 } 1291 1292 if (pbs) { 1293 *pbs = bs; 1294 } 1295 1296 return bitmap; 1297 } 1298 1299 /* New and old BlockDriverState structs for atomic group operations */ 1300 1301 typedef struct BlkActionState BlkActionState; 1302 1303 /** 1304 * BlkActionOps: 1305 * Table of operations that define an Action. 1306 * 1307 * @instance_size: Size of state struct, in bytes. 1308 * @prepare: Prepare the work, must NOT be NULL. 1309 * @commit: Commit the changes, can be NULL. 1310 * @abort: Abort the changes on fail, can be NULL. 1311 * @clean: Clean up resources after all transaction actions have called 1312 * commit() or abort(). Can be NULL. 1313 * 1314 * Only prepare() may fail. In a single transaction, only one of commit() or 1315 * abort() will be called. clean() will always be called if it is present. 1316 */ 1317 typedef struct BlkActionOps { 1318 size_t instance_size; 1319 void (*prepare)(BlkActionState *common, Error **errp); 1320 void (*commit)(BlkActionState *common); 1321 void (*abort)(BlkActionState *common); 1322 void (*clean)(BlkActionState *common); 1323 } BlkActionOps; 1324 1325 /** 1326 * BlkActionState: 1327 * Describes one Action's state within a Transaction. 1328 * 1329 * @action: QAPI-defined enum identifying which Action to perform. 1330 * @ops: Table of ActionOps this Action can perform. 1331 * @block_job_txn: Transaction which this action belongs to. 1332 * @entry: List membership for all Actions in this Transaction. 1333 * 1334 * This structure must be arranged as first member in a subclassed type, 1335 * assuming that the compiler will also arrange it to the same offsets as the 1336 * base class. 1337 */ 1338 struct BlkActionState { 1339 TransactionAction *action; 1340 const BlkActionOps *ops; 1341 JobTxn *block_job_txn; 1342 TransactionProperties *txn_props; 1343 QTAILQ_ENTRY(BlkActionState) entry; 1344 }; 1345 1346 /* internal snapshot private data */ 1347 typedef struct InternalSnapshotState { 1348 BlkActionState common; 1349 BlockDriverState *bs; 1350 QEMUSnapshotInfo sn; 1351 bool created; 1352 } InternalSnapshotState; 1353 1354 1355 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1356 { 1357 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1358 error_setg(errp, 1359 "Action '%s' does not support Transaction property " 1360 "completion-mode = %s", 1361 TransactionActionKind_str(s->action->type), 1362 ActionCompletionMode_str(s->txn_props->completion_mode)); 1363 return -1; 1364 } 1365 return 0; 1366 } 1367 1368 static void internal_snapshot_prepare(BlkActionState *common, 1369 Error **errp) 1370 { 1371 Error *local_err = NULL; 1372 const char *device; 1373 const char *name; 1374 BlockDriverState *bs; 1375 QEMUSnapshotInfo old_sn, *sn; 1376 bool ret; 1377 qemu_timeval tv; 1378 BlockdevSnapshotInternal *internal; 1379 InternalSnapshotState *state; 1380 AioContext *aio_context; 1381 int ret1; 1382 1383 g_assert(common->action->type == 1384 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1385 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1386 state = DO_UPCAST(InternalSnapshotState, common, common); 1387 1388 /* 1. parse input */ 1389 device = internal->device; 1390 name = internal->name; 1391 1392 /* 2. check for validation */ 1393 if (action_check_completion_mode(common, errp) < 0) { 1394 return; 1395 } 1396 1397 bs = qmp_get_root_bs(device, errp); 1398 if (!bs) { 1399 return; 1400 } 1401 1402 aio_context = bdrv_get_aio_context(bs); 1403 aio_context_acquire(aio_context); 1404 1405 state->bs = bs; 1406 1407 /* Paired with .clean() */ 1408 bdrv_drained_begin(bs); 1409 1410 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1411 goto out; 1412 } 1413 1414 if (bdrv_is_read_only(bs)) { 1415 error_setg(errp, "Device '%s' is read only", device); 1416 goto out; 1417 } 1418 1419 if (!bdrv_can_snapshot(bs)) { 1420 error_setg(errp, "Block format '%s' used by device '%s' " 1421 "does not support internal snapshots", 1422 bs->drv->format_name, device); 1423 goto out; 1424 } 1425 1426 if (!strlen(name)) { 1427 error_setg(errp, "Name is empty"); 1428 goto out; 1429 } 1430 1431 /* check whether a snapshot with name exist */ 1432 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1433 &local_err); 1434 if (local_err) { 1435 error_propagate(errp, local_err); 1436 goto out; 1437 } else if (ret) { 1438 error_setg(errp, 1439 "Snapshot with name '%s' already exists on device '%s'", 1440 name, device); 1441 goto out; 1442 } 1443 1444 /* 3. take the snapshot */ 1445 sn = &state->sn; 1446 pstrcpy(sn->name, sizeof(sn->name), name); 1447 qemu_gettimeofday(&tv); 1448 sn->date_sec = tv.tv_sec; 1449 sn->date_nsec = tv.tv_usec * 1000; 1450 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1451 1452 ret1 = bdrv_snapshot_create(bs, sn); 1453 if (ret1 < 0) { 1454 error_setg_errno(errp, -ret1, 1455 "Failed to create snapshot '%s' on device '%s'", 1456 name, device); 1457 goto out; 1458 } 1459 1460 /* 4. succeed, mark a snapshot is created */ 1461 state->created = true; 1462 1463 out: 1464 aio_context_release(aio_context); 1465 } 1466 1467 static void internal_snapshot_abort(BlkActionState *common) 1468 { 1469 InternalSnapshotState *state = 1470 DO_UPCAST(InternalSnapshotState, common, common); 1471 BlockDriverState *bs = state->bs; 1472 QEMUSnapshotInfo *sn = &state->sn; 1473 AioContext *aio_context; 1474 Error *local_error = NULL; 1475 1476 if (!state->created) { 1477 return; 1478 } 1479 1480 aio_context = bdrv_get_aio_context(state->bs); 1481 aio_context_acquire(aio_context); 1482 1483 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1484 error_reportf_err(local_error, 1485 "Failed to delete snapshot with id '%s' and " 1486 "name '%s' on device '%s' in abort: ", 1487 sn->id_str, sn->name, 1488 bdrv_get_device_name(bs)); 1489 } 1490 1491 aio_context_release(aio_context); 1492 } 1493 1494 static void internal_snapshot_clean(BlkActionState *common) 1495 { 1496 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1497 common, common); 1498 AioContext *aio_context; 1499 1500 if (!state->bs) { 1501 return; 1502 } 1503 1504 aio_context = bdrv_get_aio_context(state->bs); 1505 aio_context_acquire(aio_context); 1506 1507 bdrv_drained_end(state->bs); 1508 1509 aio_context_release(aio_context); 1510 } 1511 1512 /* external snapshot private data */ 1513 typedef struct ExternalSnapshotState { 1514 BlkActionState common; 1515 BlockDriverState *old_bs; 1516 BlockDriverState *new_bs; 1517 bool overlay_appended; 1518 } ExternalSnapshotState; 1519 1520 static void external_snapshot_prepare(BlkActionState *common, 1521 Error **errp) 1522 { 1523 int flags = 0; 1524 QDict *options = NULL; 1525 Error *local_err = NULL; 1526 /* Device and node name of the image to generate the snapshot from */ 1527 const char *device; 1528 const char *node_name; 1529 /* Reference to the new image (for 'blockdev-snapshot') */ 1530 const char *snapshot_ref; 1531 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1532 const char *new_image_file; 1533 ExternalSnapshotState *state = 1534 DO_UPCAST(ExternalSnapshotState, common, common); 1535 TransactionAction *action = common->action; 1536 AioContext *aio_context; 1537 int ret; 1538 1539 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1540 * purpose but a different set of parameters */ 1541 switch (action->type) { 1542 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1543 { 1544 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1545 device = s->node; 1546 node_name = s->node; 1547 new_image_file = NULL; 1548 snapshot_ref = s->overlay; 1549 } 1550 break; 1551 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1552 { 1553 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1554 device = s->has_device ? s->device : NULL; 1555 node_name = s->has_node_name ? s->node_name : NULL; 1556 new_image_file = s->snapshot_file; 1557 snapshot_ref = NULL; 1558 } 1559 break; 1560 default: 1561 g_assert_not_reached(); 1562 } 1563 1564 /* start processing */ 1565 if (action_check_completion_mode(common, errp) < 0) { 1566 return; 1567 } 1568 1569 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1570 if (!state->old_bs) { 1571 return; 1572 } 1573 1574 aio_context = bdrv_get_aio_context(state->old_bs); 1575 aio_context_acquire(aio_context); 1576 1577 /* Paired with .clean() */ 1578 bdrv_drained_begin(state->old_bs); 1579 1580 if (!bdrv_is_inserted(state->old_bs)) { 1581 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1582 goto out; 1583 } 1584 1585 if (bdrv_op_is_blocked(state->old_bs, 1586 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1587 goto out; 1588 } 1589 1590 if (!bdrv_is_read_only(state->old_bs)) { 1591 if (bdrv_flush(state->old_bs)) { 1592 error_setg(errp, QERR_IO_ERROR); 1593 goto out; 1594 } 1595 } 1596 1597 if (!bdrv_is_first_non_filter(state->old_bs)) { 1598 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1599 goto out; 1600 } 1601 1602 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1603 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1604 const char *format = s->has_format ? s->format : "qcow2"; 1605 enum NewImageMode mode; 1606 const char *snapshot_node_name = 1607 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1608 1609 if (node_name && !snapshot_node_name) { 1610 error_setg(errp, "New overlay node name missing"); 1611 goto out; 1612 } 1613 1614 if (snapshot_node_name && 1615 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1616 error_setg(errp, "New overlay node name already in use"); 1617 goto out; 1618 } 1619 1620 flags = state->old_bs->open_flags; 1621 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1622 flags |= BDRV_O_NO_BACKING; 1623 1624 /* create new image w/backing file */ 1625 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1626 if (mode != NEW_IMAGE_MODE_EXISTING) { 1627 int64_t size = bdrv_getlength(state->old_bs); 1628 if (size < 0) { 1629 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1630 goto out; 1631 } 1632 bdrv_refresh_filename(state->old_bs); 1633 bdrv_img_create(new_image_file, format, 1634 state->old_bs->filename, 1635 state->old_bs->drv->format_name, 1636 NULL, size, flags, false, &local_err); 1637 if (local_err) { 1638 error_propagate(errp, local_err); 1639 goto out; 1640 } 1641 } 1642 1643 options = qdict_new(); 1644 if (snapshot_node_name) { 1645 qdict_put_str(options, "node-name", snapshot_node_name); 1646 } 1647 qdict_put_str(options, "driver", format); 1648 } 1649 1650 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1651 errp); 1652 /* We will manually add the backing_hd field to the bs later */ 1653 if (!state->new_bs) { 1654 goto out; 1655 } 1656 1657 if (bdrv_has_blk(state->new_bs)) { 1658 error_setg(errp, "The overlay is already in use"); 1659 goto out; 1660 } 1661 1662 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1663 errp)) { 1664 goto out; 1665 } 1666 1667 if (state->new_bs->backing != NULL) { 1668 error_setg(errp, "The overlay already has a backing image"); 1669 goto out; 1670 } 1671 1672 if (!state->new_bs->drv->supports_backing) { 1673 error_setg(errp, "The overlay does not support backing images"); 1674 goto out; 1675 } 1676 1677 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp); 1678 if (ret < 0) { 1679 goto out; 1680 } 1681 1682 /* This removes our old bs and adds the new bs. This is an operation that 1683 * can fail, so we need to do it in .prepare; undoing it for abort is 1684 * always possible. */ 1685 bdrv_ref(state->new_bs); 1686 bdrv_append(state->new_bs, state->old_bs, &local_err); 1687 if (local_err) { 1688 error_propagate(errp, local_err); 1689 goto out; 1690 } 1691 state->overlay_appended = true; 1692 1693 out: 1694 aio_context_release(aio_context); 1695 } 1696 1697 static void external_snapshot_commit(BlkActionState *common) 1698 { 1699 ExternalSnapshotState *state = 1700 DO_UPCAST(ExternalSnapshotState, common, common); 1701 AioContext *aio_context; 1702 1703 aio_context = bdrv_get_aio_context(state->old_bs); 1704 aio_context_acquire(aio_context); 1705 1706 /* We don't need (or want) to use the transactional 1707 * bdrv_reopen_multiple() across all the entries at once, because we 1708 * don't want to abort all of them if one of them fails the reopen */ 1709 if (!atomic_read(&state->old_bs->copy_on_read)) { 1710 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1711 } 1712 1713 aio_context_release(aio_context); 1714 } 1715 1716 static void external_snapshot_abort(BlkActionState *common) 1717 { 1718 ExternalSnapshotState *state = 1719 DO_UPCAST(ExternalSnapshotState, common, common); 1720 if (state->new_bs) { 1721 if (state->overlay_appended) { 1722 AioContext *aio_context; 1723 1724 aio_context = bdrv_get_aio_context(state->old_bs); 1725 aio_context_acquire(aio_context); 1726 1727 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1728 close state->old_bs; we need it */ 1729 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1730 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1731 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1732 1733 aio_context_release(aio_context); 1734 } 1735 } 1736 } 1737 1738 static void external_snapshot_clean(BlkActionState *common) 1739 { 1740 ExternalSnapshotState *state = 1741 DO_UPCAST(ExternalSnapshotState, common, common); 1742 AioContext *aio_context; 1743 1744 if (!state->old_bs) { 1745 return; 1746 } 1747 1748 aio_context = bdrv_get_aio_context(state->old_bs); 1749 aio_context_acquire(aio_context); 1750 1751 bdrv_drained_end(state->old_bs); 1752 bdrv_unref(state->new_bs); 1753 1754 aio_context_release(aio_context); 1755 } 1756 1757 typedef struct DriveBackupState { 1758 BlkActionState common; 1759 BlockDriverState *bs; 1760 BlockJob *job; 1761 } DriveBackupState; 1762 1763 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1764 Error **errp); 1765 1766 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1767 { 1768 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1769 BlockDriverState *bs; 1770 DriveBackup *backup; 1771 AioContext *aio_context; 1772 Error *local_err = NULL; 1773 1774 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1775 backup = common->action->u.drive_backup.data; 1776 1777 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1778 if (!bs) { 1779 return; 1780 } 1781 1782 aio_context = bdrv_get_aio_context(bs); 1783 aio_context_acquire(aio_context); 1784 1785 /* Paired with .clean() */ 1786 bdrv_drained_begin(bs); 1787 1788 state->bs = bs; 1789 1790 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1791 if (local_err) { 1792 error_propagate(errp, local_err); 1793 goto out; 1794 } 1795 1796 out: 1797 aio_context_release(aio_context); 1798 } 1799 1800 static void drive_backup_commit(BlkActionState *common) 1801 { 1802 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1803 AioContext *aio_context; 1804 1805 aio_context = bdrv_get_aio_context(state->bs); 1806 aio_context_acquire(aio_context); 1807 1808 assert(state->job); 1809 job_start(&state->job->job); 1810 1811 aio_context_release(aio_context); 1812 } 1813 1814 static void drive_backup_abort(BlkActionState *common) 1815 { 1816 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1817 1818 if (state->job) { 1819 AioContext *aio_context; 1820 1821 aio_context = bdrv_get_aio_context(state->bs); 1822 aio_context_acquire(aio_context); 1823 1824 job_cancel_sync(&state->job->job); 1825 1826 aio_context_release(aio_context); 1827 } 1828 } 1829 1830 static void drive_backup_clean(BlkActionState *common) 1831 { 1832 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1833 AioContext *aio_context; 1834 1835 if (!state->bs) { 1836 return; 1837 } 1838 1839 aio_context = bdrv_get_aio_context(state->bs); 1840 aio_context_acquire(aio_context); 1841 1842 bdrv_drained_end(state->bs); 1843 1844 aio_context_release(aio_context); 1845 } 1846 1847 typedef struct BlockdevBackupState { 1848 BlkActionState common; 1849 BlockDriverState *bs; 1850 BlockJob *job; 1851 } BlockdevBackupState; 1852 1853 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1854 Error **errp); 1855 1856 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1857 { 1858 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1859 BlockdevBackup *backup; 1860 BlockDriverState *bs, *target; 1861 AioContext *aio_context; 1862 Error *local_err = NULL; 1863 1864 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1865 backup = common->action->u.blockdev_backup.data; 1866 1867 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1868 if (!bs) { 1869 return; 1870 } 1871 1872 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1873 if (!target) { 1874 return; 1875 } 1876 1877 aio_context = bdrv_get_aio_context(bs); 1878 aio_context_acquire(aio_context); 1879 state->bs = bs; 1880 1881 /* Paired with .clean() */ 1882 bdrv_drained_begin(state->bs); 1883 1884 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1885 if (local_err) { 1886 error_propagate(errp, local_err); 1887 goto out; 1888 } 1889 1890 out: 1891 aio_context_release(aio_context); 1892 } 1893 1894 static void blockdev_backup_commit(BlkActionState *common) 1895 { 1896 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1897 AioContext *aio_context; 1898 1899 aio_context = bdrv_get_aio_context(state->bs); 1900 aio_context_acquire(aio_context); 1901 1902 assert(state->job); 1903 job_start(&state->job->job); 1904 1905 aio_context_release(aio_context); 1906 } 1907 1908 static void blockdev_backup_abort(BlkActionState *common) 1909 { 1910 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1911 1912 if (state->job) { 1913 AioContext *aio_context; 1914 1915 aio_context = bdrv_get_aio_context(state->bs); 1916 aio_context_acquire(aio_context); 1917 1918 job_cancel_sync(&state->job->job); 1919 1920 aio_context_release(aio_context); 1921 } 1922 } 1923 1924 static void blockdev_backup_clean(BlkActionState *common) 1925 { 1926 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1927 AioContext *aio_context; 1928 1929 if (!state->bs) { 1930 return; 1931 } 1932 1933 aio_context = bdrv_get_aio_context(state->bs); 1934 aio_context_acquire(aio_context); 1935 1936 bdrv_drained_end(state->bs); 1937 1938 aio_context_release(aio_context); 1939 } 1940 1941 typedef struct BlockDirtyBitmapState { 1942 BlkActionState common; 1943 BdrvDirtyBitmap *bitmap; 1944 BlockDriverState *bs; 1945 HBitmap *backup; 1946 bool prepared; 1947 bool was_enabled; 1948 } BlockDirtyBitmapState; 1949 1950 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1951 Error **errp) 1952 { 1953 Error *local_err = NULL; 1954 BlockDirtyBitmapAdd *action; 1955 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1956 common, common); 1957 1958 if (action_check_completion_mode(common, errp) < 0) { 1959 return; 1960 } 1961 1962 action = common->action->u.block_dirty_bitmap_add.data; 1963 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1964 qmp_block_dirty_bitmap_add(action->node, action->name, 1965 action->has_granularity, action->granularity, 1966 action->has_persistent, action->persistent, 1967 action->has_autoload, action->autoload, 1968 action->has_disabled, action->disabled, 1969 &local_err); 1970 1971 if (!local_err) { 1972 state->prepared = true; 1973 } else { 1974 error_propagate(errp, local_err); 1975 } 1976 } 1977 1978 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1979 { 1980 BlockDirtyBitmapAdd *action; 1981 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1982 common, common); 1983 1984 action = common->action->u.block_dirty_bitmap_add.data; 1985 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1986 * then the node reference and bitmap name must have been valid. 1987 */ 1988 if (state->prepared) { 1989 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1990 } 1991 } 1992 1993 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1994 Error **errp) 1995 { 1996 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1997 common, common); 1998 BlockDirtyBitmap *action; 1999 2000 if (action_check_completion_mode(common, errp) < 0) { 2001 return; 2002 } 2003 2004 action = common->action->u.block_dirty_bitmap_clear.data; 2005 state->bitmap = block_dirty_bitmap_lookup(action->node, 2006 action->name, 2007 &state->bs, 2008 errp); 2009 if (!state->bitmap) { 2010 return; 2011 } 2012 2013 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2014 return; 2015 } 2016 2017 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2018 } 2019 2020 static void block_dirty_bitmap_restore(BlkActionState *common) 2021 { 2022 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2023 common, common); 2024 2025 if (state->backup) { 2026 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2027 } 2028 } 2029 2030 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2031 { 2032 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2033 common, common); 2034 2035 hbitmap_free(state->backup); 2036 } 2037 2038 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2039 Error **errp) 2040 { 2041 BlockDirtyBitmap *action; 2042 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2043 common, common); 2044 2045 if (action_check_completion_mode(common, errp) < 0) { 2046 return; 2047 } 2048 2049 action = common->action->u.block_dirty_bitmap_enable.data; 2050 state->bitmap = block_dirty_bitmap_lookup(action->node, 2051 action->name, 2052 NULL, 2053 errp); 2054 if (!state->bitmap) { 2055 return; 2056 } 2057 2058 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2059 return; 2060 } 2061 2062 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2063 bdrv_enable_dirty_bitmap(state->bitmap); 2064 } 2065 2066 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2067 { 2068 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2069 common, common); 2070 2071 if (!state->was_enabled) { 2072 bdrv_disable_dirty_bitmap(state->bitmap); 2073 } 2074 } 2075 2076 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2077 Error **errp) 2078 { 2079 BlockDirtyBitmap *action; 2080 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2081 common, common); 2082 2083 if (action_check_completion_mode(common, errp) < 0) { 2084 return; 2085 } 2086 2087 action = common->action->u.block_dirty_bitmap_disable.data; 2088 state->bitmap = block_dirty_bitmap_lookup(action->node, 2089 action->name, 2090 NULL, 2091 errp); 2092 if (!state->bitmap) { 2093 return; 2094 } 2095 2096 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2097 return; 2098 } 2099 2100 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2101 bdrv_disable_dirty_bitmap(state->bitmap); 2102 } 2103 2104 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2105 { 2106 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2107 common, common); 2108 2109 if (state->was_enabled) { 2110 bdrv_enable_dirty_bitmap(state->bitmap); 2111 } 2112 } 2113 2114 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2115 const char *node, const char *target, 2116 BlockDirtyBitmapMergeSourceList *bitmaps, 2117 HBitmap **backup, Error **errp); 2118 2119 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2120 Error **errp) 2121 { 2122 BlockDirtyBitmapMerge *action; 2123 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2124 common, common); 2125 2126 if (action_check_completion_mode(common, errp) < 0) { 2127 return; 2128 } 2129 2130 action = common->action->u.block_dirty_bitmap_merge.data; 2131 2132 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2133 action->bitmaps, &state->backup, 2134 errp); 2135 } 2136 2137 static void abort_prepare(BlkActionState *common, Error **errp) 2138 { 2139 error_setg(errp, "Transaction aborted using Abort action"); 2140 } 2141 2142 static void abort_commit(BlkActionState *common) 2143 { 2144 g_assert_not_reached(); /* this action never succeeds */ 2145 } 2146 2147 static const BlkActionOps actions[] = { 2148 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2149 .instance_size = sizeof(ExternalSnapshotState), 2150 .prepare = external_snapshot_prepare, 2151 .commit = external_snapshot_commit, 2152 .abort = external_snapshot_abort, 2153 .clean = external_snapshot_clean, 2154 }, 2155 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2156 .instance_size = sizeof(ExternalSnapshotState), 2157 .prepare = external_snapshot_prepare, 2158 .commit = external_snapshot_commit, 2159 .abort = external_snapshot_abort, 2160 .clean = external_snapshot_clean, 2161 }, 2162 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2163 .instance_size = sizeof(DriveBackupState), 2164 .prepare = drive_backup_prepare, 2165 .commit = drive_backup_commit, 2166 .abort = drive_backup_abort, 2167 .clean = drive_backup_clean, 2168 }, 2169 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2170 .instance_size = sizeof(BlockdevBackupState), 2171 .prepare = blockdev_backup_prepare, 2172 .commit = blockdev_backup_commit, 2173 .abort = blockdev_backup_abort, 2174 .clean = blockdev_backup_clean, 2175 }, 2176 [TRANSACTION_ACTION_KIND_ABORT] = { 2177 .instance_size = sizeof(BlkActionState), 2178 .prepare = abort_prepare, 2179 .commit = abort_commit, 2180 }, 2181 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2182 .instance_size = sizeof(InternalSnapshotState), 2183 .prepare = internal_snapshot_prepare, 2184 .abort = internal_snapshot_abort, 2185 .clean = internal_snapshot_clean, 2186 }, 2187 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2188 .instance_size = sizeof(BlockDirtyBitmapState), 2189 .prepare = block_dirty_bitmap_add_prepare, 2190 .abort = block_dirty_bitmap_add_abort, 2191 }, 2192 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2193 .instance_size = sizeof(BlockDirtyBitmapState), 2194 .prepare = block_dirty_bitmap_clear_prepare, 2195 .commit = block_dirty_bitmap_free_backup, 2196 .abort = block_dirty_bitmap_restore, 2197 }, 2198 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2199 .instance_size = sizeof(BlockDirtyBitmapState), 2200 .prepare = block_dirty_bitmap_enable_prepare, 2201 .abort = block_dirty_bitmap_enable_abort, 2202 }, 2203 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2204 .instance_size = sizeof(BlockDirtyBitmapState), 2205 .prepare = block_dirty_bitmap_disable_prepare, 2206 .abort = block_dirty_bitmap_disable_abort, 2207 }, 2208 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2209 .instance_size = sizeof(BlockDirtyBitmapState), 2210 .prepare = block_dirty_bitmap_merge_prepare, 2211 .commit = block_dirty_bitmap_free_backup, 2212 .abort = block_dirty_bitmap_restore, 2213 }, 2214 /* Where are transactions for MIRROR, COMMIT and STREAM? 2215 * Although these blockjobs use transaction callbacks like the backup job, 2216 * these jobs do not necessarily adhere to transaction semantics. 2217 * These jobs may not fully undo all of their actions on abort, nor do they 2218 * necessarily work in transactions with more than one job in them. 2219 */ 2220 }; 2221 2222 /** 2223 * Allocate a TransactionProperties structure if necessary, and fill 2224 * that structure with desired defaults if they are unset. 2225 */ 2226 static TransactionProperties *get_transaction_properties( 2227 TransactionProperties *props) 2228 { 2229 if (!props) { 2230 props = g_new0(TransactionProperties, 1); 2231 } 2232 2233 if (!props->has_completion_mode) { 2234 props->has_completion_mode = true; 2235 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2236 } 2237 2238 return props; 2239 } 2240 2241 /* 2242 * 'Atomic' group operations. The operations are performed as a set, and if 2243 * any fail then we roll back all operations in the group. 2244 */ 2245 void qmp_transaction(TransactionActionList *dev_list, 2246 bool has_props, 2247 struct TransactionProperties *props, 2248 Error **errp) 2249 { 2250 TransactionActionList *dev_entry = dev_list; 2251 JobTxn *block_job_txn = NULL; 2252 BlkActionState *state, *next; 2253 Error *local_err = NULL; 2254 2255 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2256 QTAILQ_INIT(&snap_bdrv_states); 2257 2258 /* Does this transaction get canceled as a group on failure? 2259 * If not, we don't really need to make a JobTxn. 2260 */ 2261 props = get_transaction_properties(props); 2262 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2263 block_job_txn = job_txn_new(); 2264 } 2265 2266 /* drain all i/o before any operations */ 2267 bdrv_drain_all(); 2268 2269 /* We don't do anything in this loop that commits us to the operations */ 2270 while (NULL != dev_entry) { 2271 TransactionAction *dev_info = NULL; 2272 const BlkActionOps *ops; 2273 2274 dev_info = dev_entry->value; 2275 dev_entry = dev_entry->next; 2276 2277 assert(dev_info->type < ARRAY_SIZE(actions)); 2278 2279 ops = &actions[dev_info->type]; 2280 assert(ops->instance_size > 0); 2281 2282 state = g_malloc0(ops->instance_size); 2283 state->ops = ops; 2284 state->action = dev_info; 2285 state->block_job_txn = block_job_txn; 2286 state->txn_props = props; 2287 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2288 2289 state->ops->prepare(state, &local_err); 2290 if (local_err) { 2291 error_propagate(errp, local_err); 2292 goto delete_and_fail; 2293 } 2294 } 2295 2296 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2297 if (state->ops->commit) { 2298 state->ops->commit(state); 2299 } 2300 } 2301 2302 /* success */ 2303 goto exit; 2304 2305 delete_and_fail: 2306 /* failure, and it is all-or-none; roll back all operations */ 2307 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2308 if (state->ops->abort) { 2309 state->ops->abort(state); 2310 } 2311 } 2312 exit: 2313 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2314 if (state->ops->clean) { 2315 state->ops->clean(state); 2316 } 2317 g_free(state); 2318 } 2319 if (!has_props) { 2320 qapi_free_TransactionProperties(props); 2321 } 2322 job_txn_unref(block_job_txn); 2323 } 2324 2325 void qmp_eject(bool has_device, const char *device, 2326 bool has_id, const char *id, 2327 bool has_force, bool force, Error **errp) 2328 { 2329 Error *local_err = NULL; 2330 int rc; 2331 2332 if (!has_force) { 2333 force = false; 2334 } 2335 2336 rc = do_open_tray(has_device ? device : NULL, 2337 has_id ? id : NULL, 2338 force, &local_err); 2339 if (rc && rc != -ENOSYS) { 2340 error_propagate(errp, local_err); 2341 return; 2342 } 2343 error_free(local_err); 2344 2345 blockdev_remove_medium(has_device, device, has_id, id, errp); 2346 } 2347 2348 void qmp_block_passwd(bool has_device, const char *device, 2349 bool has_node_name, const char *node_name, 2350 const char *password, Error **errp) 2351 { 2352 error_setg(errp, 2353 "Setting block passwords directly is no longer supported"); 2354 } 2355 2356 /* 2357 * Attempt to open the tray of @device. 2358 * If @force, ignore its tray lock. 2359 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2360 * On error, store an error through @errp and return -errno. 2361 * If @device does not exist, return -ENODEV. 2362 * If it has no removable media, return -ENOTSUP. 2363 * If it has no tray, return -ENOSYS. 2364 * If the guest was asked to open the tray, return -EINPROGRESS. 2365 * Else, return 0. 2366 */ 2367 static int do_open_tray(const char *blk_name, const char *qdev_id, 2368 bool force, Error **errp) 2369 { 2370 BlockBackend *blk; 2371 const char *device = qdev_id ?: blk_name; 2372 bool locked; 2373 2374 blk = qmp_get_blk(blk_name, qdev_id, errp); 2375 if (!blk) { 2376 return -ENODEV; 2377 } 2378 2379 if (!blk_dev_has_removable_media(blk)) { 2380 error_setg(errp, "Device '%s' is not removable", device); 2381 return -ENOTSUP; 2382 } 2383 2384 if (!blk_dev_has_tray(blk)) { 2385 error_setg(errp, "Device '%s' does not have a tray", device); 2386 return -ENOSYS; 2387 } 2388 2389 if (blk_dev_is_tray_open(blk)) { 2390 return 0; 2391 } 2392 2393 locked = blk_dev_is_medium_locked(blk); 2394 if (locked) { 2395 blk_dev_eject_request(blk, force); 2396 } 2397 2398 if (!locked || force) { 2399 blk_dev_change_media_cb(blk, false, &error_abort); 2400 } 2401 2402 if (locked && !force) { 2403 error_setg(errp, "Device '%s' is locked and force was not specified, " 2404 "wait for tray to open and try again", device); 2405 return -EINPROGRESS; 2406 } 2407 2408 return 0; 2409 } 2410 2411 void qmp_blockdev_open_tray(bool has_device, const char *device, 2412 bool has_id, const char *id, 2413 bool has_force, bool force, 2414 Error **errp) 2415 { 2416 Error *local_err = NULL; 2417 int rc; 2418 2419 if (!has_force) { 2420 force = false; 2421 } 2422 rc = do_open_tray(has_device ? device : NULL, 2423 has_id ? id : NULL, 2424 force, &local_err); 2425 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2426 error_propagate(errp, local_err); 2427 return; 2428 } 2429 error_free(local_err); 2430 } 2431 2432 void qmp_blockdev_close_tray(bool has_device, const char *device, 2433 bool has_id, const char *id, 2434 Error **errp) 2435 { 2436 BlockBackend *blk; 2437 Error *local_err = NULL; 2438 2439 device = has_device ? device : NULL; 2440 id = has_id ? id : NULL; 2441 2442 blk = qmp_get_blk(device, id, errp); 2443 if (!blk) { 2444 return; 2445 } 2446 2447 if (!blk_dev_has_removable_media(blk)) { 2448 error_setg(errp, "Device '%s' is not removable", device ?: id); 2449 return; 2450 } 2451 2452 if (!blk_dev_has_tray(blk)) { 2453 /* Ignore this command on tray-less devices */ 2454 return; 2455 } 2456 2457 if (!blk_dev_is_tray_open(blk)) { 2458 return; 2459 } 2460 2461 blk_dev_change_media_cb(blk, true, &local_err); 2462 if (local_err) { 2463 error_propagate(errp, local_err); 2464 return; 2465 } 2466 } 2467 2468 static void blockdev_remove_medium(bool has_device, const char *device, 2469 bool has_id, const char *id, Error **errp) 2470 { 2471 BlockBackend *blk; 2472 BlockDriverState *bs; 2473 AioContext *aio_context; 2474 bool has_attached_device; 2475 2476 device = has_device ? device : NULL; 2477 id = has_id ? id : NULL; 2478 2479 blk = qmp_get_blk(device, id, errp); 2480 if (!blk) { 2481 return; 2482 } 2483 2484 /* For BBs without a device, we can exchange the BDS tree at will */ 2485 has_attached_device = blk_get_attached_dev(blk); 2486 2487 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2488 error_setg(errp, "Device '%s' is not removable", device ?: id); 2489 return; 2490 } 2491 2492 if (has_attached_device && blk_dev_has_tray(blk) && 2493 !blk_dev_is_tray_open(blk)) 2494 { 2495 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2496 return; 2497 } 2498 2499 bs = blk_bs(blk); 2500 if (!bs) { 2501 return; 2502 } 2503 2504 aio_context = bdrv_get_aio_context(bs); 2505 aio_context_acquire(aio_context); 2506 2507 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2508 goto out; 2509 } 2510 2511 blk_remove_bs(blk); 2512 2513 if (!blk_dev_has_tray(blk)) { 2514 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2515 * called at all); therefore, the medium needs to be ejected here. 2516 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2517 * value passed here (i.e. false). */ 2518 blk_dev_change_media_cb(blk, false, &error_abort); 2519 } 2520 2521 out: 2522 aio_context_release(aio_context); 2523 } 2524 2525 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2526 { 2527 blockdev_remove_medium(false, NULL, true, id, errp); 2528 } 2529 2530 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2531 BlockDriverState *bs, Error **errp) 2532 { 2533 Error *local_err = NULL; 2534 bool has_device; 2535 int ret; 2536 2537 /* For BBs without a device, we can exchange the BDS tree at will */ 2538 has_device = blk_get_attached_dev(blk); 2539 2540 if (has_device && !blk_dev_has_removable_media(blk)) { 2541 error_setg(errp, "Device is not removable"); 2542 return; 2543 } 2544 2545 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2546 error_setg(errp, "Tray of the device is not open"); 2547 return; 2548 } 2549 2550 if (blk_bs(blk)) { 2551 error_setg(errp, "There already is a medium in the device"); 2552 return; 2553 } 2554 2555 ret = blk_insert_bs(blk, bs, errp); 2556 if (ret < 0) { 2557 return; 2558 } 2559 2560 if (!blk_dev_has_tray(blk)) { 2561 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2562 * called at all); therefore, the medium needs to be pushed into the 2563 * slot here. 2564 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2565 * value passed here (i.e. true). */ 2566 blk_dev_change_media_cb(blk, true, &local_err); 2567 if (local_err) { 2568 error_propagate(errp, local_err); 2569 blk_remove_bs(blk); 2570 return; 2571 } 2572 } 2573 } 2574 2575 static void blockdev_insert_medium(bool has_device, const char *device, 2576 bool has_id, const char *id, 2577 const char *node_name, Error **errp) 2578 { 2579 BlockBackend *blk; 2580 BlockDriverState *bs; 2581 2582 blk = qmp_get_blk(has_device ? device : NULL, 2583 has_id ? id : NULL, 2584 errp); 2585 if (!blk) { 2586 return; 2587 } 2588 2589 bs = bdrv_find_node(node_name); 2590 if (!bs) { 2591 error_setg(errp, "Node '%s' not found", node_name); 2592 return; 2593 } 2594 2595 if (bdrv_has_blk(bs)) { 2596 error_setg(errp, "Node '%s' is already in use", node_name); 2597 return; 2598 } 2599 2600 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2601 } 2602 2603 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2604 Error **errp) 2605 { 2606 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2607 } 2608 2609 void qmp_blockdev_change_medium(bool has_device, const char *device, 2610 bool has_id, const char *id, 2611 const char *filename, 2612 bool has_format, const char *format, 2613 bool has_read_only, 2614 BlockdevChangeReadOnlyMode read_only, 2615 Error **errp) 2616 { 2617 BlockBackend *blk; 2618 BlockDriverState *medium_bs = NULL; 2619 int bdrv_flags; 2620 bool detect_zeroes; 2621 int rc; 2622 QDict *options = NULL; 2623 Error *err = NULL; 2624 2625 blk = qmp_get_blk(has_device ? device : NULL, 2626 has_id ? id : NULL, 2627 errp); 2628 if (!blk) { 2629 goto fail; 2630 } 2631 2632 if (blk_bs(blk)) { 2633 blk_update_root_state(blk); 2634 } 2635 2636 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2637 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2638 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2639 2640 if (!has_read_only) { 2641 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2642 } 2643 2644 switch (read_only) { 2645 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2646 break; 2647 2648 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2649 bdrv_flags &= ~BDRV_O_RDWR; 2650 break; 2651 2652 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2653 bdrv_flags |= BDRV_O_RDWR; 2654 break; 2655 2656 default: 2657 abort(); 2658 } 2659 2660 options = qdict_new(); 2661 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2662 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2663 2664 if (has_format) { 2665 qdict_put_str(options, "driver", format); 2666 } 2667 2668 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2669 if (!medium_bs) { 2670 goto fail; 2671 } 2672 2673 rc = do_open_tray(has_device ? device : NULL, 2674 has_id ? id : NULL, 2675 false, &err); 2676 if (rc && rc != -ENOSYS) { 2677 error_propagate(errp, err); 2678 goto fail; 2679 } 2680 error_free(err); 2681 err = NULL; 2682 2683 blockdev_remove_medium(has_device, device, has_id, id, &err); 2684 if (err) { 2685 error_propagate(errp, err); 2686 goto fail; 2687 } 2688 2689 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2690 if (err) { 2691 error_propagate(errp, err); 2692 goto fail; 2693 } 2694 2695 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2696 2697 fail: 2698 /* If the medium has been inserted, the device has its own reference, so 2699 * ours must be relinquished; and if it has not been inserted successfully, 2700 * the reference must be relinquished anyway */ 2701 bdrv_unref(medium_bs); 2702 } 2703 2704 /* throttling disk I/O limits */ 2705 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2706 { 2707 ThrottleConfig cfg; 2708 BlockDriverState *bs; 2709 BlockBackend *blk; 2710 AioContext *aio_context; 2711 2712 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2713 arg->has_id ? arg->id : NULL, 2714 errp); 2715 if (!blk) { 2716 return; 2717 } 2718 2719 aio_context = blk_get_aio_context(blk); 2720 aio_context_acquire(aio_context); 2721 2722 bs = blk_bs(blk); 2723 if (!bs) { 2724 error_setg(errp, "Device has no medium"); 2725 goto out; 2726 } 2727 2728 throttle_config_init(&cfg); 2729 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2730 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2731 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2732 2733 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2734 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2735 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2736 2737 if (arg->has_bps_max) { 2738 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2739 } 2740 if (arg->has_bps_rd_max) { 2741 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2742 } 2743 if (arg->has_bps_wr_max) { 2744 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2745 } 2746 if (arg->has_iops_max) { 2747 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2748 } 2749 if (arg->has_iops_rd_max) { 2750 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2751 } 2752 if (arg->has_iops_wr_max) { 2753 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2754 } 2755 2756 if (arg->has_bps_max_length) { 2757 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2758 } 2759 if (arg->has_bps_rd_max_length) { 2760 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2761 } 2762 if (arg->has_bps_wr_max_length) { 2763 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2764 } 2765 if (arg->has_iops_max_length) { 2766 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2767 } 2768 if (arg->has_iops_rd_max_length) { 2769 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2770 } 2771 if (arg->has_iops_wr_max_length) { 2772 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2773 } 2774 2775 if (arg->has_iops_size) { 2776 cfg.op_size = arg->iops_size; 2777 } 2778 2779 if (!throttle_is_valid(&cfg, errp)) { 2780 goto out; 2781 } 2782 2783 if (throttle_enabled(&cfg)) { 2784 /* Enable I/O limits if they're not enabled yet, otherwise 2785 * just update the throttling group. */ 2786 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2787 blk_io_limits_enable(blk, 2788 arg->has_group ? arg->group : 2789 arg->has_device ? arg->device : 2790 arg->id); 2791 } else if (arg->has_group) { 2792 blk_io_limits_update_group(blk, arg->group); 2793 } 2794 /* Set the new throttling configuration */ 2795 blk_set_io_limits(blk, &cfg); 2796 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2797 /* If all throttling settings are set to 0, disable I/O limits */ 2798 blk_io_limits_disable(blk); 2799 } 2800 2801 out: 2802 aio_context_release(aio_context); 2803 } 2804 2805 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2806 bool has_granularity, uint32_t granularity, 2807 bool has_persistent, bool persistent, 2808 bool has_autoload, bool autoload, 2809 bool has_disabled, bool disabled, 2810 Error **errp) 2811 { 2812 BlockDriverState *bs; 2813 BdrvDirtyBitmap *bitmap; 2814 AioContext *aio_context = NULL; 2815 2816 if (!name || name[0] == '\0') { 2817 error_setg(errp, "Bitmap name cannot be empty"); 2818 return; 2819 } 2820 2821 bs = bdrv_lookup_bs(node, node, errp); 2822 if (!bs) { 2823 return; 2824 } 2825 2826 if (has_granularity) { 2827 if (granularity < 512 || !is_power_of_2(granularity)) { 2828 error_setg(errp, "Granularity must be power of 2 " 2829 "and at least 512"); 2830 return; 2831 } 2832 } else { 2833 /* Default to cluster size, if available: */ 2834 granularity = bdrv_get_default_bitmap_granularity(bs); 2835 } 2836 2837 if (!has_persistent) { 2838 persistent = false; 2839 } 2840 2841 if (has_autoload) { 2842 warn_report("Autoload option is deprecated and its value is ignored"); 2843 } 2844 2845 if (!has_disabled) { 2846 disabled = false; 2847 } 2848 2849 if (persistent) { 2850 aio_context = bdrv_get_aio_context(bs); 2851 aio_context_acquire(aio_context); 2852 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2853 goto out; 2854 } 2855 } 2856 2857 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2858 if (bitmap == NULL) { 2859 goto out; 2860 } 2861 2862 if (disabled) { 2863 bdrv_disable_dirty_bitmap(bitmap); 2864 } 2865 2866 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2867 out: 2868 if (aio_context) { 2869 aio_context_release(aio_context); 2870 } 2871 } 2872 2873 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2874 Error **errp) 2875 { 2876 BlockDriverState *bs; 2877 BdrvDirtyBitmap *bitmap; 2878 Error *local_err = NULL; 2879 AioContext *aio_context = NULL; 2880 2881 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2882 if (!bitmap || !bs) { 2883 return; 2884 } 2885 2886 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2887 errp)) { 2888 return; 2889 } 2890 2891 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2892 aio_context = bdrv_get_aio_context(bs); 2893 aio_context_acquire(aio_context); 2894 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2895 if (local_err != NULL) { 2896 error_propagate(errp, local_err); 2897 goto out; 2898 } 2899 } 2900 2901 bdrv_release_dirty_bitmap(bs, bitmap); 2902 out: 2903 if (aio_context) { 2904 aio_context_release(aio_context); 2905 } 2906 } 2907 2908 /** 2909 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2910 * immediately after a full backup operation. 2911 */ 2912 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2913 Error **errp) 2914 { 2915 BdrvDirtyBitmap *bitmap; 2916 BlockDriverState *bs; 2917 2918 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2919 if (!bitmap || !bs) { 2920 return; 2921 } 2922 2923 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2924 return; 2925 } 2926 2927 bdrv_clear_dirty_bitmap(bitmap, NULL); 2928 } 2929 2930 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2931 Error **errp) 2932 { 2933 BlockDriverState *bs; 2934 BdrvDirtyBitmap *bitmap; 2935 2936 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2937 if (!bitmap) { 2938 return; 2939 } 2940 2941 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2942 return; 2943 } 2944 2945 bdrv_enable_dirty_bitmap(bitmap); 2946 } 2947 2948 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2949 Error **errp) 2950 { 2951 BlockDriverState *bs; 2952 BdrvDirtyBitmap *bitmap; 2953 2954 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2955 if (!bitmap) { 2956 return; 2957 } 2958 2959 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2960 return; 2961 } 2962 2963 bdrv_disable_dirty_bitmap(bitmap); 2964 } 2965 2966 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2967 const char *node, const char *target, 2968 BlockDirtyBitmapMergeSourceList *bitmaps, 2969 HBitmap **backup, Error **errp) 2970 { 2971 BlockDriverState *bs; 2972 BdrvDirtyBitmap *dst, *src, *anon; 2973 BlockDirtyBitmapMergeSourceList *lst; 2974 Error *local_err = NULL; 2975 2976 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 2977 if (!dst) { 2978 return NULL; 2979 } 2980 2981 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 2982 NULL, errp); 2983 if (!anon) { 2984 return NULL; 2985 } 2986 2987 for (lst = bitmaps; lst; lst = lst->next) { 2988 switch (lst->value->type) { 2989 const char *name, *node; 2990 case QTYPE_QSTRING: 2991 name = lst->value->u.local; 2992 src = bdrv_find_dirty_bitmap(bs, name); 2993 if (!src) { 2994 error_setg(errp, "Dirty bitmap '%s' not found", name); 2995 dst = NULL; 2996 goto out; 2997 } 2998 break; 2999 case QTYPE_QDICT: 3000 node = lst->value->u.external.node; 3001 name = lst->value->u.external.name; 3002 src = block_dirty_bitmap_lookup(node, name, NULL, errp); 3003 if (!src) { 3004 dst = NULL; 3005 goto out; 3006 } 3007 break; 3008 default: 3009 abort(); 3010 } 3011 3012 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 3013 if (local_err) { 3014 error_propagate(errp, local_err); 3015 dst = NULL; 3016 goto out; 3017 } 3018 } 3019 3020 /* Merge into dst; dst is unchanged on failure. */ 3021 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3022 3023 out: 3024 bdrv_release_dirty_bitmap(bs, anon); 3025 return dst; 3026 } 3027 3028 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3029 BlockDirtyBitmapMergeSourceList *bitmaps, 3030 Error **errp) 3031 { 3032 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3033 } 3034 3035 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3036 const char *name, 3037 Error **errp) 3038 { 3039 BdrvDirtyBitmap *bitmap; 3040 BlockDriverState *bs; 3041 BlockDirtyBitmapSha256 *ret = NULL; 3042 char *sha256; 3043 3044 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3045 if (!bitmap || !bs) { 3046 return NULL; 3047 } 3048 3049 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3050 if (sha256 == NULL) { 3051 return NULL; 3052 } 3053 3054 ret = g_new(BlockDirtyBitmapSha256, 1); 3055 ret->sha256 = sha256; 3056 3057 return ret; 3058 } 3059 3060 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3061 { 3062 const char *id = qdict_get_str(qdict, "id"); 3063 BlockBackend *blk; 3064 BlockDriverState *bs; 3065 AioContext *aio_context; 3066 Error *local_err = NULL; 3067 3068 bs = bdrv_find_node(id); 3069 if (bs) { 3070 qmp_blockdev_del(id, &local_err); 3071 if (local_err) { 3072 error_report_err(local_err); 3073 } 3074 return; 3075 } 3076 3077 blk = blk_by_name(id); 3078 if (!blk) { 3079 error_report("Device '%s' not found", id); 3080 return; 3081 } 3082 3083 if (!blk_legacy_dinfo(blk)) { 3084 error_report("Deleting device added with blockdev-add" 3085 " is not supported"); 3086 return; 3087 } 3088 3089 aio_context = blk_get_aio_context(blk); 3090 aio_context_acquire(aio_context); 3091 3092 bs = blk_bs(blk); 3093 if (bs) { 3094 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3095 error_report_err(local_err); 3096 aio_context_release(aio_context); 3097 return; 3098 } 3099 3100 blk_remove_bs(blk); 3101 } 3102 3103 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3104 monitor_remove_blk(blk); 3105 3106 /* If this BlockBackend has a device attached to it, its refcount will be 3107 * decremented when the device is removed; otherwise we have to do so here. 3108 */ 3109 if (blk_get_attached_dev(blk)) { 3110 /* Further I/O must not pause the guest */ 3111 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3112 BLOCKDEV_ON_ERROR_REPORT); 3113 } else { 3114 blk_unref(blk); 3115 } 3116 3117 aio_context_release(aio_context); 3118 } 3119 3120 void qmp_block_resize(bool has_device, const char *device, 3121 bool has_node_name, const char *node_name, 3122 int64_t size, Error **errp) 3123 { 3124 Error *local_err = NULL; 3125 BlockBackend *blk = NULL; 3126 BlockDriverState *bs; 3127 AioContext *aio_context; 3128 int ret; 3129 3130 bs = bdrv_lookup_bs(has_device ? device : NULL, 3131 has_node_name ? node_name : NULL, 3132 &local_err); 3133 if (local_err) { 3134 error_propagate(errp, local_err); 3135 return; 3136 } 3137 3138 aio_context = bdrv_get_aio_context(bs); 3139 aio_context_acquire(aio_context); 3140 3141 if (!bdrv_is_first_non_filter(bs)) { 3142 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3143 goto out; 3144 } 3145 3146 if (size < 0) { 3147 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3148 goto out; 3149 } 3150 3151 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3152 error_setg(errp, QERR_DEVICE_IN_USE, device); 3153 goto out; 3154 } 3155 3156 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL); 3157 ret = blk_insert_bs(blk, bs, errp); 3158 if (ret < 0) { 3159 goto out; 3160 } 3161 3162 bdrv_drained_begin(bs); 3163 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3164 bdrv_drained_end(bs); 3165 3166 out: 3167 blk_unref(blk); 3168 aio_context_release(aio_context); 3169 } 3170 3171 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3172 bool has_base, const char *base, 3173 bool has_base_node, const char *base_node, 3174 bool has_backing_file, const char *backing_file, 3175 bool has_speed, int64_t speed, 3176 bool has_on_error, BlockdevOnError on_error, 3177 bool has_auto_finalize, bool auto_finalize, 3178 bool has_auto_dismiss, bool auto_dismiss, 3179 Error **errp) 3180 { 3181 BlockDriverState *bs, *iter; 3182 BlockDriverState *base_bs = NULL; 3183 AioContext *aio_context; 3184 Error *local_err = NULL; 3185 const char *base_name = NULL; 3186 int job_flags = JOB_DEFAULT; 3187 3188 if (!has_on_error) { 3189 on_error = BLOCKDEV_ON_ERROR_REPORT; 3190 } 3191 3192 bs = bdrv_lookup_bs(device, device, errp); 3193 if (!bs) { 3194 return; 3195 } 3196 3197 aio_context = bdrv_get_aio_context(bs); 3198 aio_context_acquire(aio_context); 3199 3200 if (has_base && has_base_node) { 3201 error_setg(errp, "'base' and 'base-node' cannot be specified " 3202 "at the same time"); 3203 goto out; 3204 } 3205 3206 if (has_base) { 3207 base_bs = bdrv_find_backing_image(bs, base); 3208 if (base_bs == NULL) { 3209 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3210 goto out; 3211 } 3212 assert(bdrv_get_aio_context(base_bs) == aio_context); 3213 base_name = base; 3214 } 3215 3216 if (has_base_node) { 3217 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3218 if (!base_bs) { 3219 goto out; 3220 } 3221 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3222 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3223 base_node, device); 3224 goto out; 3225 } 3226 assert(bdrv_get_aio_context(base_bs) == aio_context); 3227 bdrv_refresh_filename(base_bs); 3228 base_name = base_bs->filename; 3229 } 3230 3231 /* Check for op blockers in the whole chain between bs and base */ 3232 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3233 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3234 goto out; 3235 } 3236 } 3237 3238 /* if we are streaming the entire chain, the result will have no backing 3239 * file, and specifying one is therefore an error */ 3240 if (base_bs == NULL && has_backing_file) { 3241 error_setg(errp, "backing file specified, but streaming the " 3242 "entire chain"); 3243 goto out; 3244 } 3245 3246 /* backing_file string overrides base bs filename */ 3247 base_name = has_backing_file ? backing_file : base_name; 3248 3249 if (has_auto_finalize && !auto_finalize) { 3250 job_flags |= JOB_MANUAL_FINALIZE; 3251 } 3252 if (has_auto_dismiss && !auto_dismiss) { 3253 job_flags |= JOB_MANUAL_DISMISS; 3254 } 3255 3256 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3257 job_flags, has_speed ? speed : 0, on_error, &local_err); 3258 if (local_err) { 3259 error_propagate(errp, local_err); 3260 goto out; 3261 } 3262 3263 trace_qmp_block_stream(bs); 3264 3265 out: 3266 aio_context_release(aio_context); 3267 } 3268 3269 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3270 bool has_base_node, const char *base_node, 3271 bool has_base, const char *base, 3272 bool has_top_node, const char *top_node, 3273 bool has_top, const char *top, 3274 bool has_backing_file, const char *backing_file, 3275 bool has_speed, int64_t speed, 3276 bool has_filter_node_name, const char *filter_node_name, 3277 bool has_auto_finalize, bool auto_finalize, 3278 bool has_auto_dismiss, bool auto_dismiss, 3279 Error **errp) 3280 { 3281 BlockDriverState *bs; 3282 BlockDriverState *iter; 3283 BlockDriverState *base_bs, *top_bs; 3284 AioContext *aio_context; 3285 Error *local_err = NULL; 3286 /* This will be part of the QMP command, if/when the 3287 * BlockdevOnError change for blkmirror makes it in 3288 */ 3289 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3290 int job_flags = JOB_DEFAULT; 3291 3292 if (!has_speed) { 3293 speed = 0; 3294 } 3295 if (!has_filter_node_name) { 3296 filter_node_name = NULL; 3297 } 3298 if (has_auto_finalize && !auto_finalize) { 3299 job_flags |= JOB_MANUAL_FINALIZE; 3300 } 3301 if (has_auto_dismiss && !auto_dismiss) { 3302 job_flags |= JOB_MANUAL_DISMISS; 3303 } 3304 3305 /* Important Note: 3306 * libvirt relies on the DeviceNotFound error class in order to probe for 3307 * live commit feature versions; for this to work, we must make sure to 3308 * perform the device lookup before any generic errors that may occur in a 3309 * scenario in which all optional arguments are omitted. */ 3310 bs = qmp_get_root_bs(device, &local_err); 3311 if (!bs) { 3312 bs = bdrv_lookup_bs(device, device, NULL); 3313 if (!bs) { 3314 error_free(local_err); 3315 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3316 "Device '%s' not found", device); 3317 } else { 3318 error_propagate(errp, local_err); 3319 } 3320 return; 3321 } 3322 3323 aio_context = bdrv_get_aio_context(bs); 3324 aio_context_acquire(aio_context); 3325 3326 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3327 goto out; 3328 } 3329 3330 /* default top_bs is the active layer */ 3331 top_bs = bs; 3332 3333 if (has_top_node && has_top) { 3334 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3335 goto out; 3336 } else if (has_top_node) { 3337 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3338 if (top_bs == NULL) { 3339 goto out; 3340 } 3341 if (!bdrv_chain_contains(bs, top_bs)) { 3342 error_setg(errp, "'%s' is not in this backing file chain", 3343 top_node); 3344 goto out; 3345 } 3346 } else if (has_top && top) { 3347 /* This strcmp() is just a shortcut, there is no need to 3348 * refresh @bs's filename. If it mismatches, 3349 * bdrv_find_backing_image() will do the refresh and may still 3350 * return @bs. */ 3351 if (strcmp(bs->filename, top) != 0) { 3352 top_bs = bdrv_find_backing_image(bs, top); 3353 } 3354 } 3355 3356 if (top_bs == NULL) { 3357 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3358 goto out; 3359 } 3360 3361 assert(bdrv_get_aio_context(top_bs) == aio_context); 3362 3363 if (has_base_node && has_base) { 3364 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3365 goto out; 3366 } else if (has_base_node) { 3367 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3368 if (base_bs == NULL) { 3369 goto out; 3370 } 3371 if (!bdrv_chain_contains(top_bs, base_bs)) { 3372 error_setg(errp, "'%s' is not in this backing file chain", 3373 base_node); 3374 goto out; 3375 } 3376 } else if (has_base && base) { 3377 base_bs = bdrv_find_backing_image(top_bs, base); 3378 } else { 3379 base_bs = bdrv_find_base(top_bs); 3380 } 3381 3382 if (base_bs == NULL) { 3383 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3384 goto out; 3385 } 3386 3387 assert(bdrv_get_aio_context(base_bs) == aio_context); 3388 3389 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3390 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3391 goto out; 3392 } 3393 } 3394 3395 /* Do not allow attempts to commit an image into itself */ 3396 if (top_bs == base_bs) { 3397 error_setg(errp, "cannot commit an image into itself"); 3398 goto out; 3399 } 3400 3401 if (top_bs == bs) { 3402 if (has_backing_file) { 3403 error_setg(errp, "'backing-file' specified," 3404 " but 'top' is the active layer"); 3405 goto out; 3406 } 3407 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3408 job_flags, speed, on_error, 3409 filter_node_name, NULL, NULL, false, &local_err); 3410 } else { 3411 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3412 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3413 goto out; 3414 } 3415 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3416 speed, on_error, has_backing_file ? backing_file : NULL, 3417 filter_node_name, &local_err); 3418 } 3419 if (local_err != NULL) { 3420 error_propagate(errp, local_err); 3421 goto out; 3422 } 3423 3424 out: 3425 aio_context_release(aio_context); 3426 } 3427 3428 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3429 Error **errp) 3430 { 3431 BlockDriverState *bs; 3432 BlockDriverState *target_bs; 3433 BlockDriverState *source = NULL; 3434 BlockJob *job = NULL; 3435 BdrvDirtyBitmap *bmap = NULL; 3436 AioContext *aio_context; 3437 QDict *options = NULL; 3438 Error *local_err = NULL; 3439 int flags, job_flags = JOB_DEFAULT; 3440 int64_t size; 3441 bool set_backing_hd = false; 3442 int ret; 3443 3444 if (!backup->has_speed) { 3445 backup->speed = 0; 3446 } 3447 if (!backup->has_on_source_error) { 3448 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3449 } 3450 if (!backup->has_on_target_error) { 3451 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3452 } 3453 if (!backup->has_mode) { 3454 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3455 } 3456 if (!backup->has_job_id) { 3457 backup->job_id = NULL; 3458 } 3459 if (!backup->has_auto_finalize) { 3460 backup->auto_finalize = true; 3461 } 3462 if (!backup->has_auto_dismiss) { 3463 backup->auto_dismiss = true; 3464 } 3465 if (!backup->has_compress) { 3466 backup->compress = false; 3467 } 3468 3469 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3470 if (!bs) { 3471 return NULL; 3472 } 3473 3474 if (!bs->drv) { 3475 error_setg(errp, "Device has no medium"); 3476 return NULL; 3477 } 3478 3479 aio_context = bdrv_get_aio_context(bs); 3480 aio_context_acquire(aio_context); 3481 3482 if (!backup->has_format) { 3483 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3484 NULL : (char*) bs->drv->format_name; 3485 } 3486 3487 /* Early check to avoid creating target */ 3488 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3489 goto out; 3490 } 3491 3492 flags = bs->open_flags | BDRV_O_RDWR; 3493 3494 /* See if we have a backing HD we can use to create our new image 3495 * on top of. */ 3496 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3497 source = backing_bs(bs); 3498 if (!source) { 3499 backup->sync = MIRROR_SYNC_MODE_FULL; 3500 } 3501 } 3502 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3503 source = bs; 3504 flags |= BDRV_O_NO_BACKING; 3505 set_backing_hd = true; 3506 } 3507 3508 size = bdrv_getlength(bs); 3509 if (size < 0) { 3510 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3511 goto out; 3512 } 3513 3514 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3515 assert(backup->format); 3516 if (source) { 3517 bdrv_refresh_filename(source); 3518 bdrv_img_create(backup->target, backup->format, source->filename, 3519 source->drv->format_name, NULL, 3520 size, flags, false, &local_err); 3521 } else { 3522 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3523 size, flags, false, &local_err); 3524 } 3525 } 3526 3527 if (local_err) { 3528 error_propagate(errp, local_err); 3529 goto out; 3530 } 3531 3532 if (backup->format) { 3533 if (!options) { 3534 options = qdict_new(); 3535 } 3536 qdict_put_str(options, "driver", backup->format); 3537 } 3538 3539 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3540 if (!target_bs) { 3541 goto out; 3542 } 3543 3544 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3545 if (ret < 0) { 3546 bdrv_unref(target_bs); 3547 goto out; 3548 } 3549 3550 if (set_backing_hd) { 3551 bdrv_set_backing_hd(target_bs, source, &local_err); 3552 if (local_err) { 3553 goto unref; 3554 } 3555 } 3556 3557 if (backup->has_bitmap) { 3558 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3559 if (!bmap) { 3560 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3561 goto unref; 3562 } 3563 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3564 goto unref; 3565 } 3566 } 3567 if (!backup->auto_finalize) { 3568 job_flags |= JOB_MANUAL_FINALIZE; 3569 } 3570 if (!backup->auto_dismiss) { 3571 job_flags |= JOB_MANUAL_DISMISS; 3572 } 3573 3574 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3575 backup->sync, bmap, backup->compress, 3576 backup->on_source_error, backup->on_target_error, 3577 job_flags, NULL, NULL, txn, &local_err); 3578 if (local_err != NULL) { 3579 error_propagate(errp, local_err); 3580 goto unref; 3581 } 3582 3583 unref: 3584 bdrv_unref(target_bs); 3585 out: 3586 aio_context_release(aio_context); 3587 return job; 3588 } 3589 3590 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3591 { 3592 3593 BlockJob *job; 3594 job = do_drive_backup(arg, NULL, errp); 3595 if (job) { 3596 job_start(&job->job); 3597 } 3598 } 3599 3600 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3601 { 3602 return bdrv_named_nodes_list(errp); 3603 } 3604 3605 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3606 { 3607 return bdrv_get_xdbg_block_graph(errp); 3608 } 3609 3610 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3611 Error **errp) 3612 { 3613 BlockDriverState *bs; 3614 BlockDriverState *target_bs; 3615 Error *local_err = NULL; 3616 BdrvDirtyBitmap *bmap = NULL; 3617 AioContext *aio_context; 3618 BlockJob *job = NULL; 3619 int job_flags = JOB_DEFAULT; 3620 int ret; 3621 3622 if (!backup->has_speed) { 3623 backup->speed = 0; 3624 } 3625 if (!backup->has_on_source_error) { 3626 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3627 } 3628 if (!backup->has_on_target_error) { 3629 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3630 } 3631 if (!backup->has_job_id) { 3632 backup->job_id = NULL; 3633 } 3634 if (!backup->has_auto_finalize) { 3635 backup->auto_finalize = true; 3636 } 3637 if (!backup->has_auto_dismiss) { 3638 backup->auto_dismiss = true; 3639 } 3640 if (!backup->has_compress) { 3641 backup->compress = false; 3642 } 3643 3644 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3645 if (!bs) { 3646 return NULL; 3647 } 3648 3649 aio_context = bdrv_get_aio_context(bs); 3650 aio_context_acquire(aio_context); 3651 3652 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3653 if (!target_bs) { 3654 goto out; 3655 } 3656 3657 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3658 if (ret < 0) { 3659 goto out; 3660 } 3661 3662 if (backup->has_bitmap) { 3663 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3664 if (!bmap) { 3665 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3666 goto out; 3667 } 3668 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3669 goto out; 3670 } 3671 } 3672 3673 if (!backup->auto_finalize) { 3674 job_flags |= JOB_MANUAL_FINALIZE; 3675 } 3676 if (!backup->auto_dismiss) { 3677 job_flags |= JOB_MANUAL_DISMISS; 3678 } 3679 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3680 backup->sync, bmap, backup->compress, 3681 backup->on_source_error, backup->on_target_error, 3682 job_flags, NULL, NULL, txn, &local_err); 3683 if (local_err != NULL) { 3684 error_propagate(errp, local_err); 3685 } 3686 out: 3687 aio_context_release(aio_context); 3688 return job; 3689 } 3690 3691 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3692 { 3693 BlockJob *job; 3694 job = do_blockdev_backup(arg, NULL, errp); 3695 if (job) { 3696 job_start(&job->job); 3697 } 3698 } 3699 3700 /* Parameter check and block job starting for drive mirroring. 3701 * Caller should hold @device and @target's aio context (must be the same). 3702 **/ 3703 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3704 BlockDriverState *target, 3705 bool has_replaces, const char *replaces, 3706 enum MirrorSyncMode sync, 3707 BlockMirrorBackingMode backing_mode, 3708 bool has_speed, int64_t speed, 3709 bool has_granularity, uint32_t granularity, 3710 bool has_buf_size, int64_t buf_size, 3711 bool has_on_source_error, 3712 BlockdevOnError on_source_error, 3713 bool has_on_target_error, 3714 BlockdevOnError on_target_error, 3715 bool has_unmap, bool unmap, 3716 bool has_filter_node_name, 3717 const char *filter_node_name, 3718 bool has_copy_mode, MirrorCopyMode copy_mode, 3719 bool has_auto_finalize, bool auto_finalize, 3720 bool has_auto_dismiss, bool auto_dismiss, 3721 Error **errp) 3722 { 3723 int job_flags = JOB_DEFAULT; 3724 3725 if (!has_speed) { 3726 speed = 0; 3727 } 3728 if (!has_on_source_error) { 3729 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3730 } 3731 if (!has_on_target_error) { 3732 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3733 } 3734 if (!has_granularity) { 3735 granularity = 0; 3736 } 3737 if (!has_buf_size) { 3738 buf_size = 0; 3739 } 3740 if (!has_unmap) { 3741 unmap = true; 3742 } 3743 if (!has_filter_node_name) { 3744 filter_node_name = NULL; 3745 } 3746 if (!has_copy_mode) { 3747 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3748 } 3749 if (has_auto_finalize && !auto_finalize) { 3750 job_flags |= JOB_MANUAL_FINALIZE; 3751 } 3752 if (has_auto_dismiss && !auto_dismiss) { 3753 job_flags |= JOB_MANUAL_DISMISS; 3754 } 3755 3756 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3757 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3758 "a value in range [512B, 64MB]"); 3759 return; 3760 } 3761 if (granularity & (granularity - 1)) { 3762 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3763 "power of 2"); 3764 return; 3765 } 3766 3767 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3768 return; 3769 } 3770 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3771 return; 3772 } 3773 3774 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3775 sync = MIRROR_SYNC_MODE_FULL; 3776 } 3777 3778 if (has_replaces) { 3779 BlockDriverState *to_replace_bs; 3780 AioContext *replace_aio_context; 3781 int64_t bs_size, replace_size; 3782 3783 bs_size = bdrv_getlength(bs); 3784 if (bs_size < 0) { 3785 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3786 return; 3787 } 3788 3789 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3790 if (!to_replace_bs) { 3791 return; 3792 } 3793 3794 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3795 aio_context_acquire(replace_aio_context); 3796 replace_size = bdrv_getlength(to_replace_bs); 3797 aio_context_release(replace_aio_context); 3798 3799 if (replace_size < 0) { 3800 error_setg_errno(errp, -replace_size, 3801 "Failed to query the replacement node's size"); 3802 return; 3803 } 3804 if (bs_size != replace_size) { 3805 error_setg(errp, "cannot replace image with a mirror image of " 3806 "different size"); 3807 return; 3808 } 3809 } 3810 3811 /* pass the node name to replace to mirror start since it's loose coupling 3812 * and will allow to check whether the node still exist at mirror completion 3813 */ 3814 mirror_start(job_id, bs, target, 3815 has_replaces ? replaces : NULL, job_flags, 3816 speed, granularity, buf_size, sync, backing_mode, 3817 on_source_error, on_target_error, unmap, filter_node_name, 3818 copy_mode, errp); 3819 } 3820 3821 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3822 { 3823 BlockDriverState *bs; 3824 BlockDriverState *source, *target_bs; 3825 AioContext *aio_context; 3826 BlockMirrorBackingMode backing_mode; 3827 Error *local_err = NULL; 3828 QDict *options = NULL; 3829 int flags; 3830 int64_t size; 3831 const char *format = arg->format; 3832 int ret; 3833 3834 bs = qmp_get_root_bs(arg->device, errp); 3835 if (!bs) { 3836 return; 3837 } 3838 3839 /* Early check to avoid creating target */ 3840 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3841 return; 3842 } 3843 3844 aio_context = bdrv_get_aio_context(bs); 3845 aio_context_acquire(aio_context); 3846 3847 if (!arg->has_mode) { 3848 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3849 } 3850 3851 if (!arg->has_format) { 3852 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3853 ? NULL : bs->drv->format_name); 3854 } 3855 3856 flags = bs->open_flags | BDRV_O_RDWR; 3857 source = backing_bs(bs); 3858 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3859 arg->sync = MIRROR_SYNC_MODE_FULL; 3860 } 3861 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3862 source = bs; 3863 } 3864 3865 size = bdrv_getlength(bs); 3866 if (size < 0) { 3867 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3868 goto out; 3869 } 3870 3871 if (arg->has_replaces) { 3872 if (!arg->has_node_name) { 3873 error_setg(errp, "a node-name must be provided when replacing a" 3874 " named node of the graph"); 3875 goto out; 3876 } 3877 } 3878 3879 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3880 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3881 } else { 3882 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3883 } 3884 3885 /* Don't open backing image in create() */ 3886 flags |= BDRV_O_NO_BACKING; 3887 3888 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3889 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3890 { 3891 /* create new image w/o backing file */ 3892 assert(format); 3893 bdrv_img_create(arg->target, format, 3894 NULL, NULL, NULL, size, flags, false, &local_err); 3895 } else { 3896 switch (arg->mode) { 3897 case NEW_IMAGE_MODE_EXISTING: 3898 break; 3899 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3900 /* create new image with backing file */ 3901 bdrv_refresh_filename(source); 3902 bdrv_img_create(arg->target, format, 3903 source->filename, 3904 source->drv->format_name, 3905 NULL, size, flags, false, &local_err); 3906 break; 3907 default: 3908 abort(); 3909 } 3910 } 3911 3912 if (local_err) { 3913 error_propagate(errp, local_err); 3914 goto out; 3915 } 3916 3917 options = qdict_new(); 3918 if (arg->has_node_name) { 3919 qdict_put_str(options, "node-name", arg->node_name); 3920 } 3921 if (format) { 3922 qdict_put_str(options, "driver", format); 3923 } 3924 3925 /* Mirroring takes care of copy-on-write using the source's backing 3926 * file. 3927 */ 3928 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3929 if (!target_bs) { 3930 goto out; 3931 } 3932 3933 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3934 if (ret < 0) { 3935 bdrv_unref(target_bs); 3936 goto out; 3937 } 3938 3939 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3940 arg->has_replaces, arg->replaces, arg->sync, 3941 backing_mode, arg->has_speed, arg->speed, 3942 arg->has_granularity, arg->granularity, 3943 arg->has_buf_size, arg->buf_size, 3944 arg->has_on_source_error, arg->on_source_error, 3945 arg->has_on_target_error, arg->on_target_error, 3946 arg->has_unmap, arg->unmap, 3947 false, NULL, 3948 arg->has_copy_mode, arg->copy_mode, 3949 arg->has_auto_finalize, arg->auto_finalize, 3950 arg->has_auto_dismiss, arg->auto_dismiss, 3951 &local_err); 3952 bdrv_unref(target_bs); 3953 error_propagate(errp, local_err); 3954 out: 3955 aio_context_release(aio_context); 3956 } 3957 3958 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3959 const char *device, const char *target, 3960 bool has_replaces, const char *replaces, 3961 MirrorSyncMode sync, 3962 bool has_speed, int64_t speed, 3963 bool has_granularity, uint32_t granularity, 3964 bool has_buf_size, int64_t buf_size, 3965 bool has_on_source_error, 3966 BlockdevOnError on_source_error, 3967 bool has_on_target_error, 3968 BlockdevOnError on_target_error, 3969 bool has_filter_node_name, 3970 const char *filter_node_name, 3971 bool has_copy_mode, MirrorCopyMode copy_mode, 3972 bool has_auto_finalize, bool auto_finalize, 3973 bool has_auto_dismiss, bool auto_dismiss, 3974 Error **errp) 3975 { 3976 BlockDriverState *bs; 3977 BlockDriverState *target_bs; 3978 AioContext *aio_context; 3979 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3980 Error *local_err = NULL; 3981 int ret; 3982 3983 bs = qmp_get_root_bs(device, errp); 3984 if (!bs) { 3985 return; 3986 } 3987 3988 target_bs = bdrv_lookup_bs(target, target, errp); 3989 if (!target_bs) { 3990 return; 3991 } 3992 3993 aio_context = bdrv_get_aio_context(bs); 3994 aio_context_acquire(aio_context); 3995 3996 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3997 if (ret < 0) { 3998 goto out; 3999 } 4000 4001 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 4002 has_replaces, replaces, sync, backing_mode, 4003 has_speed, speed, 4004 has_granularity, granularity, 4005 has_buf_size, buf_size, 4006 has_on_source_error, on_source_error, 4007 has_on_target_error, on_target_error, 4008 true, true, 4009 has_filter_node_name, filter_node_name, 4010 has_copy_mode, copy_mode, 4011 has_auto_finalize, auto_finalize, 4012 has_auto_dismiss, auto_dismiss, 4013 &local_err); 4014 error_propagate(errp, local_err); 4015 out: 4016 aio_context_release(aio_context); 4017 } 4018 4019 /* Get a block job using its ID and acquire its AioContext */ 4020 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 4021 Error **errp) 4022 { 4023 BlockJob *job; 4024 4025 assert(id != NULL); 4026 4027 *aio_context = NULL; 4028 4029 job = block_job_get(id); 4030 4031 if (!job) { 4032 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4033 "Block job '%s' not found", id); 4034 return NULL; 4035 } 4036 4037 *aio_context = blk_get_aio_context(job->blk); 4038 aio_context_acquire(*aio_context); 4039 4040 return job; 4041 } 4042 4043 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4044 { 4045 AioContext *aio_context; 4046 BlockJob *job = find_block_job(device, &aio_context, errp); 4047 4048 if (!job) { 4049 return; 4050 } 4051 4052 block_job_set_speed(job, speed, errp); 4053 aio_context_release(aio_context); 4054 } 4055 4056 void qmp_block_job_cancel(const char *device, 4057 bool has_force, bool force, Error **errp) 4058 { 4059 AioContext *aio_context; 4060 BlockJob *job = find_block_job(device, &aio_context, errp); 4061 4062 if (!job) { 4063 return; 4064 } 4065 4066 if (!has_force) { 4067 force = false; 4068 } 4069 4070 if (job_user_paused(&job->job) && !force) { 4071 error_setg(errp, "The block job for device '%s' is currently paused", 4072 device); 4073 goto out; 4074 } 4075 4076 trace_qmp_block_job_cancel(job); 4077 job_user_cancel(&job->job, force, errp); 4078 out: 4079 aio_context_release(aio_context); 4080 } 4081 4082 void qmp_block_job_pause(const char *device, Error **errp) 4083 { 4084 AioContext *aio_context; 4085 BlockJob *job = find_block_job(device, &aio_context, errp); 4086 4087 if (!job) { 4088 return; 4089 } 4090 4091 trace_qmp_block_job_pause(job); 4092 job_user_pause(&job->job, errp); 4093 aio_context_release(aio_context); 4094 } 4095 4096 void qmp_block_job_resume(const char *device, Error **errp) 4097 { 4098 AioContext *aio_context; 4099 BlockJob *job = find_block_job(device, &aio_context, errp); 4100 4101 if (!job) { 4102 return; 4103 } 4104 4105 trace_qmp_block_job_resume(job); 4106 job_user_resume(&job->job, errp); 4107 aio_context_release(aio_context); 4108 } 4109 4110 void qmp_block_job_complete(const char *device, Error **errp) 4111 { 4112 AioContext *aio_context; 4113 BlockJob *job = find_block_job(device, &aio_context, errp); 4114 4115 if (!job) { 4116 return; 4117 } 4118 4119 trace_qmp_block_job_complete(job); 4120 job_complete(&job->job, errp); 4121 aio_context_release(aio_context); 4122 } 4123 4124 void qmp_block_job_finalize(const char *id, Error **errp) 4125 { 4126 AioContext *aio_context; 4127 BlockJob *job = find_block_job(id, &aio_context, errp); 4128 4129 if (!job) { 4130 return; 4131 } 4132 4133 trace_qmp_block_job_finalize(job); 4134 job_finalize(&job->job, errp); 4135 aio_context_release(aio_context); 4136 } 4137 4138 void qmp_block_job_dismiss(const char *id, Error **errp) 4139 { 4140 AioContext *aio_context; 4141 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4142 Job *job; 4143 4144 if (!bjob) { 4145 return; 4146 } 4147 4148 trace_qmp_block_job_dismiss(bjob); 4149 job = &bjob->job; 4150 job_dismiss(&job, errp); 4151 aio_context_release(aio_context); 4152 } 4153 4154 void qmp_change_backing_file(const char *device, 4155 const char *image_node_name, 4156 const char *backing_file, 4157 Error **errp) 4158 { 4159 BlockDriverState *bs = NULL; 4160 AioContext *aio_context; 4161 BlockDriverState *image_bs = NULL; 4162 Error *local_err = NULL; 4163 bool ro; 4164 int ret; 4165 4166 bs = qmp_get_root_bs(device, errp); 4167 if (!bs) { 4168 return; 4169 } 4170 4171 aio_context = bdrv_get_aio_context(bs); 4172 aio_context_acquire(aio_context); 4173 4174 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4175 if (local_err) { 4176 error_propagate(errp, local_err); 4177 goto out; 4178 } 4179 4180 if (!image_bs) { 4181 error_setg(errp, "image file not found"); 4182 goto out; 4183 } 4184 4185 if (bdrv_find_base(image_bs) == image_bs) { 4186 error_setg(errp, "not allowing backing file change on an image " 4187 "without a backing file"); 4188 goto out; 4189 } 4190 4191 /* even though we are not necessarily operating on bs, we need it to 4192 * determine if block ops are currently prohibited on the chain */ 4193 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4194 goto out; 4195 } 4196 4197 /* final sanity check */ 4198 if (!bdrv_chain_contains(bs, image_bs)) { 4199 error_setg(errp, "'%s' and image file are not in the same chain", 4200 device); 4201 goto out; 4202 } 4203 4204 /* if not r/w, reopen to make r/w */ 4205 ro = bdrv_is_read_only(image_bs); 4206 4207 if (ro) { 4208 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4209 goto out; 4210 } 4211 } 4212 4213 ret = bdrv_change_backing_file(image_bs, backing_file, 4214 image_bs->drv ? image_bs->drv->format_name : ""); 4215 4216 if (ret < 0) { 4217 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4218 backing_file); 4219 /* don't exit here, so we can try to restore open flags if 4220 * appropriate */ 4221 } 4222 4223 if (ro) { 4224 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4225 error_propagate(errp, local_err); 4226 } 4227 4228 out: 4229 aio_context_release(aio_context); 4230 } 4231 4232 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4233 { 4234 QemuOpts *opts; 4235 QDict *qdict; 4236 Error *local_err = NULL; 4237 4238 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4239 if (!opts) { 4240 return; 4241 } 4242 4243 qdict = qemu_opts_to_qdict(opts, NULL); 4244 4245 if (!qdict_get_try_str(qdict, "node-name")) { 4246 qobject_unref(qdict); 4247 error_report("'node-name' needs to be specified"); 4248 goto out; 4249 } 4250 4251 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4252 if (!bs) { 4253 error_report_err(local_err); 4254 goto out; 4255 } 4256 4257 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4258 4259 out: 4260 qemu_opts_del(opts); 4261 } 4262 4263 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4264 { 4265 BlockDriverState *bs; 4266 QObject *obj; 4267 Visitor *v = qobject_output_visitor_new(&obj); 4268 QDict *qdict; 4269 Error *local_err = NULL; 4270 4271 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4272 if (local_err) { 4273 error_propagate(errp, local_err); 4274 goto fail; 4275 } 4276 4277 visit_complete(v, &obj); 4278 qdict = qobject_to(QDict, obj); 4279 4280 qdict_flatten(qdict); 4281 4282 if (!qdict_get_try_str(qdict, "node-name")) { 4283 error_setg(errp, "'node-name' must be specified for the root node"); 4284 goto fail; 4285 } 4286 4287 bs = bds_tree_init(qdict, errp); 4288 if (!bs) { 4289 goto fail; 4290 } 4291 4292 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4293 4294 fail: 4295 visit_free(v); 4296 } 4297 4298 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4299 { 4300 BlockDriverState *bs; 4301 AioContext *ctx; 4302 QObject *obj; 4303 Visitor *v = qobject_output_visitor_new(&obj); 4304 Error *local_err = NULL; 4305 BlockReopenQueue *queue; 4306 QDict *qdict; 4307 4308 /* Check for the selected node name */ 4309 if (!options->has_node_name) { 4310 error_setg(errp, "Node name not specified"); 4311 goto fail; 4312 } 4313 4314 bs = bdrv_find_node(options->node_name); 4315 if (!bs) { 4316 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4317 goto fail; 4318 } 4319 4320 /* Put all options in a QDict and flatten it */ 4321 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4322 if (local_err) { 4323 error_propagate(errp, local_err); 4324 goto fail; 4325 } 4326 4327 visit_complete(v, &obj); 4328 qdict = qobject_to(QDict, obj); 4329 4330 qdict_flatten(qdict); 4331 4332 /* Perform the reopen operation */ 4333 ctx = bdrv_get_aio_context(bs); 4334 aio_context_acquire(ctx); 4335 bdrv_subtree_drained_begin(bs); 4336 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4337 bdrv_reopen_multiple(queue, errp); 4338 bdrv_subtree_drained_end(bs); 4339 aio_context_release(ctx); 4340 4341 fail: 4342 visit_free(v); 4343 } 4344 4345 void qmp_blockdev_del(const char *node_name, Error **errp) 4346 { 4347 AioContext *aio_context; 4348 BlockDriverState *bs; 4349 4350 bs = bdrv_find_node(node_name); 4351 if (!bs) { 4352 error_setg(errp, "Cannot find node %s", node_name); 4353 return; 4354 } 4355 if (bdrv_has_blk(bs)) { 4356 error_setg(errp, "Node %s is in use", node_name); 4357 return; 4358 } 4359 aio_context = bdrv_get_aio_context(bs); 4360 aio_context_acquire(aio_context); 4361 4362 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4363 goto out; 4364 } 4365 4366 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4367 error_setg(errp, "Node %s is not owned by the monitor", 4368 bs->node_name); 4369 goto out; 4370 } 4371 4372 if (bs->refcnt > 1) { 4373 error_setg(errp, "Block device %s is in use", 4374 bdrv_get_device_or_node_name(bs)); 4375 goto out; 4376 } 4377 4378 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4379 bdrv_unref(bs); 4380 4381 out: 4382 aio_context_release(aio_context); 4383 } 4384 4385 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4386 const char *child_name) 4387 { 4388 BdrvChild *child; 4389 4390 QLIST_FOREACH(child, &parent_bs->children, next) { 4391 if (strcmp(child->name, child_name) == 0) { 4392 return child; 4393 } 4394 } 4395 4396 return NULL; 4397 } 4398 4399 void qmp_x_blockdev_change(const char *parent, bool has_child, 4400 const char *child, bool has_node, 4401 const char *node, Error **errp) 4402 { 4403 BlockDriverState *parent_bs, *new_bs = NULL; 4404 BdrvChild *p_child; 4405 4406 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4407 if (!parent_bs) { 4408 return; 4409 } 4410 4411 if (has_child == has_node) { 4412 if (has_child) { 4413 error_setg(errp, "The parameters child and node are in conflict"); 4414 } else { 4415 error_setg(errp, "Either child or node must be specified"); 4416 } 4417 return; 4418 } 4419 4420 if (has_child) { 4421 p_child = bdrv_find_child(parent_bs, child); 4422 if (!p_child) { 4423 error_setg(errp, "Node '%s' does not have child '%s'", 4424 parent, child); 4425 return; 4426 } 4427 bdrv_del_child(parent_bs, p_child, errp); 4428 } 4429 4430 if (has_node) { 4431 new_bs = bdrv_find_node(node); 4432 if (!new_bs) { 4433 error_setg(errp, "Node '%s' not found", node); 4434 return; 4435 } 4436 bdrv_add_child(parent_bs, new_bs, errp); 4437 } 4438 } 4439 4440 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4441 { 4442 BlockJobInfoList *head = NULL, **p_next = &head; 4443 BlockJob *job; 4444 4445 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4446 BlockJobInfoList *elem; 4447 AioContext *aio_context; 4448 4449 if (block_job_is_internal(job)) { 4450 continue; 4451 } 4452 elem = g_new0(BlockJobInfoList, 1); 4453 aio_context = blk_get_aio_context(job->blk); 4454 aio_context_acquire(aio_context); 4455 elem->value = block_job_query(job, errp); 4456 aio_context_release(aio_context); 4457 if (!elem->value) { 4458 g_free(elem); 4459 qapi_free_BlockJobInfoList(head); 4460 return NULL; 4461 } 4462 *p_next = elem; 4463 p_next = &elem->next; 4464 } 4465 4466 return head; 4467 } 4468 4469 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4470 bool has_force, bool force, Error **errp) 4471 { 4472 AioContext *old_context; 4473 AioContext *new_context; 4474 BlockDriverState *bs; 4475 4476 bs = bdrv_find_node(node_name); 4477 if (!bs) { 4478 error_setg(errp, "Cannot find node %s", node_name); 4479 return; 4480 } 4481 4482 /* Protects against accidents. */ 4483 if (!(has_force && force) && bdrv_has_blk(bs)) { 4484 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4485 "be in use (use force=true to override this check)", 4486 node_name); 4487 return; 4488 } 4489 4490 if (iothread->type == QTYPE_QSTRING) { 4491 IOThread *obj = iothread_by_id(iothread->u.s); 4492 if (!obj) { 4493 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4494 return; 4495 } 4496 4497 new_context = iothread_get_aio_context(obj); 4498 } else { 4499 new_context = qemu_get_aio_context(); 4500 } 4501 4502 old_context = bdrv_get_aio_context(bs); 4503 aio_context_acquire(old_context); 4504 4505 bdrv_try_set_aio_context(bs, new_context, errp); 4506 4507 aio_context_release(old_context); 4508 } 4509 4510 void qmp_block_latency_histogram_set( 4511 const char *id, 4512 bool has_boundaries, uint64List *boundaries, 4513 bool has_boundaries_read, uint64List *boundaries_read, 4514 bool has_boundaries_write, uint64List *boundaries_write, 4515 bool has_boundaries_flush, uint64List *boundaries_flush, 4516 Error **errp) 4517 { 4518 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4519 BlockAcctStats *stats; 4520 int ret; 4521 4522 if (!blk) { 4523 return; 4524 } 4525 4526 stats = blk_get_stats(blk); 4527 4528 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4529 !has_boundaries_flush) 4530 { 4531 block_latency_histograms_clear(stats); 4532 return; 4533 } 4534 4535 if (has_boundaries || has_boundaries_read) { 4536 ret = block_latency_histogram_set( 4537 stats, BLOCK_ACCT_READ, 4538 has_boundaries_read ? boundaries_read : boundaries); 4539 if (ret) { 4540 error_setg(errp, "Device '%s' set read boundaries fail", id); 4541 return; 4542 } 4543 } 4544 4545 if (has_boundaries || has_boundaries_write) { 4546 ret = block_latency_histogram_set( 4547 stats, BLOCK_ACCT_WRITE, 4548 has_boundaries_write ? boundaries_write : boundaries); 4549 if (ret) { 4550 error_setg(errp, "Device '%s' set write boundaries fail", id); 4551 return; 4552 } 4553 } 4554 4555 if (has_boundaries || has_boundaries_flush) { 4556 ret = block_latency_histogram_set( 4557 stats, BLOCK_ACCT_FLUSH, 4558 has_boundaries_flush ? boundaries_flush : boundaries); 4559 if (ret) { 4560 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4561 return; 4562 } 4563 } 4564 } 4565 4566 QemuOptsList qemu_common_drive_opts = { 4567 .name = "drive", 4568 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4569 .desc = { 4570 { 4571 .name = "snapshot", 4572 .type = QEMU_OPT_BOOL, 4573 .help = "enable/disable snapshot mode", 4574 },{ 4575 .name = "aio", 4576 .type = QEMU_OPT_STRING, 4577 .help = "host AIO implementation (threads, native)", 4578 },{ 4579 .name = BDRV_OPT_CACHE_WB, 4580 .type = QEMU_OPT_BOOL, 4581 .help = "Enable writeback mode", 4582 },{ 4583 .name = "format", 4584 .type = QEMU_OPT_STRING, 4585 .help = "disk format (raw, qcow2, ...)", 4586 },{ 4587 .name = "rerror", 4588 .type = QEMU_OPT_STRING, 4589 .help = "read error action", 4590 },{ 4591 .name = "werror", 4592 .type = QEMU_OPT_STRING, 4593 .help = "write error action", 4594 },{ 4595 .name = BDRV_OPT_READ_ONLY, 4596 .type = QEMU_OPT_BOOL, 4597 .help = "open drive file as read-only", 4598 }, 4599 4600 THROTTLE_OPTS, 4601 4602 { 4603 .name = "throttling.group", 4604 .type = QEMU_OPT_STRING, 4605 .help = "name of the block throttling group", 4606 },{ 4607 .name = "copy-on-read", 4608 .type = QEMU_OPT_BOOL, 4609 .help = "copy read data from backing file into image file", 4610 },{ 4611 .name = "detect-zeroes", 4612 .type = QEMU_OPT_STRING, 4613 .help = "try to optimize zero writes (off, on, unmap)", 4614 },{ 4615 .name = "stats-account-invalid", 4616 .type = QEMU_OPT_BOOL, 4617 .help = "whether to account for invalid I/O operations " 4618 "in the statistics", 4619 },{ 4620 .name = "stats-account-failed", 4621 .type = QEMU_OPT_BOOL, 4622 .help = "whether to account for failed I/O operations " 4623 "in the statistics", 4624 }, 4625 { /* end of list */ } 4626 }, 4627 }; 4628 4629 QemuOptsList qemu_drive_opts = { 4630 .name = "drive", 4631 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4632 .desc = { 4633 /* 4634 * no elements => accept any params 4635 * validation will happen later 4636 */ 4637 { /* end of list */ } 4638 }, 4639 }; 4640