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/main-loop.h" 64 #include "qemu/throttle-options.h" 65 66 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 67 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 68 69 static int do_open_tray(const char *blk_name, const char *qdev_id, 70 bool force, Error **errp); 71 static void blockdev_remove_medium(bool has_device, const char *device, 72 bool has_id, const char *id, Error **errp); 73 static void blockdev_insert_medium(bool has_device, const char *device, 74 bool has_id, const char *id, 75 const char *node_name, Error **errp); 76 77 static const char *const if_name[IF_COUNT] = { 78 [IF_NONE] = "none", 79 [IF_IDE] = "ide", 80 [IF_SCSI] = "scsi", 81 [IF_FLOPPY] = "floppy", 82 [IF_PFLASH] = "pflash", 83 [IF_MTD] = "mtd", 84 [IF_SD] = "sd", 85 [IF_VIRTIO] = "virtio", 86 [IF_XEN] = "xen", 87 }; 88 89 static int if_max_devs[IF_COUNT] = { 90 /* 91 * Do not change these numbers! They govern how drive option 92 * index maps to unit and bus. That mapping is ABI. 93 * 94 * All controllers used to implement if=T drives need to support 95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 96 * Otherwise, some index values map to "impossible" bus, unit 97 * values. 98 * 99 * For instance, if you change [IF_SCSI] to 255, -drive 100 * if=scsi,index=12 no longer means bus=1,unit=5, but 101 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 102 * the drive can't be set up. Regression. 103 */ 104 [IF_IDE] = 2, 105 [IF_SCSI] = 7, 106 }; 107 108 /** 109 * Boards may call this to offer board-by-board overrides 110 * of the default, global values. 111 */ 112 void override_max_devs(BlockInterfaceType type, int max_devs) 113 { 114 BlockBackend *blk; 115 DriveInfo *dinfo; 116 117 if (max_devs <= 0) { 118 return; 119 } 120 121 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 122 dinfo = blk_legacy_dinfo(blk); 123 if (dinfo->type == type) { 124 fprintf(stderr, "Cannot override units-per-bus property of" 125 " the %s interface, because a drive of that type has" 126 " already been added.\n", if_name[type]); 127 g_assert_not_reached(); 128 } 129 } 130 131 if_max_devs[type] = max_devs; 132 } 133 134 /* 135 * We automatically delete the drive when a device using it gets 136 * unplugged. Questionable feature, but we can't just drop it. 137 * Device models call blockdev_mark_auto_del() to schedule the 138 * automatic deletion, and generic qdev code calls blockdev_auto_del() 139 * when deletion is actually safe. 140 */ 141 void blockdev_mark_auto_del(BlockBackend *blk) 142 { 143 DriveInfo *dinfo = blk_legacy_dinfo(blk); 144 BlockJob *job; 145 146 if (!dinfo) { 147 return; 148 } 149 150 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 151 if (block_job_has_bdrv(job, blk_bs(blk))) { 152 AioContext *aio_context = job->job.aio_context; 153 aio_context_acquire(aio_context); 154 155 job_cancel(&job->job, false); 156 157 aio_context_release(aio_context); 158 } 159 } 160 161 dinfo->auto_del = 1; 162 } 163 164 void blockdev_auto_del(BlockBackend *blk) 165 { 166 DriveInfo *dinfo = blk_legacy_dinfo(blk); 167 168 if (dinfo && dinfo->auto_del) { 169 monitor_remove_blk(blk); 170 blk_unref(blk); 171 } 172 } 173 174 /** 175 * Returns the current mapping of how many units per bus 176 * a particular interface can support. 177 * 178 * A positive integer indicates n units per bus. 179 * 0 implies the mapping has not been established. 180 * -1 indicates an invalid BlockInterfaceType was given. 181 */ 182 int drive_get_max_devs(BlockInterfaceType type) 183 { 184 if (type >= IF_IDE && type < IF_COUNT) { 185 return if_max_devs[type]; 186 } 187 188 return -1; 189 } 190 191 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 192 { 193 int max_devs = if_max_devs[type]; 194 return max_devs ? index / max_devs : 0; 195 } 196 197 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 198 { 199 int max_devs = if_max_devs[type]; 200 return max_devs ? index % max_devs : index; 201 } 202 203 QemuOpts *drive_def(const char *optstr) 204 { 205 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 206 } 207 208 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 209 const char *optstr) 210 { 211 QemuOpts *opts; 212 213 opts = drive_def(optstr); 214 if (!opts) { 215 return NULL; 216 } 217 if (type != IF_DEFAULT) { 218 qemu_opt_set(opts, "if", if_name[type], &error_abort); 219 } 220 if (index >= 0) { 221 qemu_opt_set_number(opts, "index", index, &error_abort); 222 } 223 if (file) 224 qemu_opt_set(opts, "file", file, &error_abort); 225 return opts; 226 } 227 228 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 229 { 230 BlockBackend *blk; 231 DriveInfo *dinfo; 232 233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 234 dinfo = blk_legacy_dinfo(blk); 235 if (dinfo && dinfo->type == type 236 && dinfo->bus == bus && dinfo->unit == unit) { 237 return dinfo; 238 } 239 } 240 241 return NULL; 242 } 243 244 void drive_check_orphaned(void) 245 { 246 BlockBackend *blk; 247 DriveInfo *dinfo; 248 Location loc; 249 bool orphans = false; 250 251 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 252 dinfo = blk_legacy_dinfo(blk); 253 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 254 dinfo->type != IF_NONE) { 255 loc_push_none(&loc); 256 qemu_opts_loc_restore(dinfo->opts); 257 error_report("machine type does not support" 258 " if=%s,bus=%d,unit=%d", 259 if_name[dinfo->type], dinfo->bus, dinfo->unit); 260 loc_pop(&loc); 261 orphans = true; 262 } 263 } 264 265 if (orphans) { 266 exit(1); 267 } 268 } 269 270 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 271 { 272 return drive_get(type, 273 drive_index_to_bus_id(type, index), 274 drive_index_to_unit_id(type, index)); 275 } 276 277 int drive_get_max_bus(BlockInterfaceType type) 278 { 279 int max_bus; 280 BlockBackend *blk; 281 DriveInfo *dinfo; 282 283 max_bus = -1; 284 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 285 dinfo = blk_legacy_dinfo(blk); 286 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 287 max_bus = dinfo->bus; 288 } 289 } 290 return max_bus; 291 } 292 293 /* Get a block device. This should only be used for single-drive devices 294 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 295 appropriate bus. */ 296 DriveInfo *drive_get_next(BlockInterfaceType type) 297 { 298 static int next_block_unit[IF_COUNT]; 299 300 return drive_get(type, 0, next_block_unit[type]++); 301 } 302 303 static void bdrv_format_print(void *opaque, const char *name) 304 { 305 qemu_printf(" %s", name); 306 } 307 308 typedef struct { 309 QEMUBH *bh; 310 BlockDriverState *bs; 311 } BDRVPutRefBH; 312 313 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 314 { 315 if (!strcmp(buf, "ignore")) { 316 return BLOCKDEV_ON_ERROR_IGNORE; 317 } else if (!is_read && !strcmp(buf, "enospc")) { 318 return BLOCKDEV_ON_ERROR_ENOSPC; 319 } else if (!strcmp(buf, "stop")) { 320 return BLOCKDEV_ON_ERROR_STOP; 321 } else if (!strcmp(buf, "report")) { 322 return BLOCKDEV_ON_ERROR_REPORT; 323 } else { 324 error_setg(errp, "'%s' invalid %s error action", 325 buf, is_read ? "read" : "write"); 326 return -1; 327 } 328 } 329 330 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 331 Error **errp) 332 { 333 const QListEntry *entry; 334 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 335 switch (qobject_type(entry->value)) { 336 337 case QTYPE_QSTRING: { 338 unsigned long long length; 339 const char *str = qstring_get_str(qobject_to(QString, 340 entry->value)); 341 if (parse_uint_full(str, &length, 10) == 0 && 342 length > 0 && length <= UINT_MAX) { 343 block_acct_add_interval(stats, (unsigned) length); 344 } else { 345 error_setg(errp, "Invalid interval length: %s", str); 346 return false; 347 } 348 break; 349 } 350 351 case QTYPE_QNUM: { 352 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 353 354 if (length > 0 && length <= UINT_MAX) { 355 block_acct_add_interval(stats, (unsigned) length); 356 } else { 357 error_setg(errp, "Invalid interval length: %" PRId64, length); 358 return false; 359 } 360 break; 361 } 362 363 default: 364 error_setg(errp, "The specification of stats-intervals is invalid"); 365 return false; 366 } 367 } 368 return true; 369 } 370 371 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 372 373 /* All parameters but @opts are optional and may be set to NULL. */ 374 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 375 const char **throttling_group, ThrottleConfig *throttle_cfg, 376 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 377 { 378 Error *local_error = NULL; 379 const char *aio; 380 381 if (bdrv_flags) { 382 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 383 *bdrv_flags |= BDRV_O_COPY_ON_READ; 384 } 385 386 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 387 if (!strcmp(aio, "native")) { 388 *bdrv_flags |= BDRV_O_NATIVE_AIO; 389 } else if (!strcmp(aio, "threads")) { 390 /* this is the default */ 391 } else { 392 error_setg(errp, "invalid aio option"); 393 return; 394 } 395 } 396 } 397 398 /* disk I/O throttling */ 399 if (throttling_group) { 400 *throttling_group = qemu_opt_get(opts, "throttling.group"); 401 } 402 403 if (throttle_cfg) { 404 throttle_config_init(throttle_cfg); 405 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 406 qemu_opt_get_number(opts, "throttling.bps-total", 0); 407 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 408 qemu_opt_get_number(opts, "throttling.bps-read", 0); 409 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 410 qemu_opt_get_number(opts, "throttling.bps-write", 0); 411 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 412 qemu_opt_get_number(opts, "throttling.iops-total", 0); 413 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 414 qemu_opt_get_number(opts, "throttling.iops-read", 0); 415 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 416 qemu_opt_get_number(opts, "throttling.iops-write", 0); 417 418 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 420 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 422 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 424 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 426 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 428 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 430 431 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 432 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 433 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 434 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 435 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 436 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 437 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 438 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 439 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 440 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 441 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 442 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 443 444 throttle_cfg->op_size = 445 qemu_opt_get_number(opts, "throttling.iops-size", 0); 446 447 if (!throttle_is_valid(throttle_cfg, errp)) { 448 return; 449 } 450 } 451 452 if (detect_zeroes) { 453 *detect_zeroes = 454 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 455 qemu_opt_get(opts, "detect-zeroes"), 456 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 457 &local_error); 458 if (local_error) { 459 error_propagate(errp, local_error); 460 return; 461 } 462 } 463 } 464 465 /* Takes the ownership of bs_opts */ 466 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 467 Error **errp) 468 { 469 const char *buf; 470 int bdrv_flags = 0; 471 int on_read_error, on_write_error; 472 bool account_invalid, account_failed; 473 bool writethrough, read_only; 474 BlockBackend *blk; 475 BlockDriverState *bs; 476 ThrottleConfig cfg; 477 int snapshot = 0; 478 Error *error = NULL; 479 QemuOpts *opts; 480 QDict *interval_dict = NULL; 481 QList *interval_list = NULL; 482 const char *id; 483 BlockdevDetectZeroesOptions detect_zeroes = 484 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 485 const char *throttling_group = NULL; 486 487 /* Check common options by copying from bs_opts to opts, all other options 488 * stay in bs_opts for processing by bdrv_open(). */ 489 id = qdict_get_try_str(bs_opts, "id"); 490 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 491 if (error) { 492 error_propagate(errp, error); 493 goto err_no_opts; 494 } 495 496 qemu_opts_absorb_qdict(opts, bs_opts, &error); 497 if (error) { 498 error_propagate(errp, error); 499 goto early_err; 500 } 501 502 if (id) { 503 qdict_del(bs_opts, "id"); 504 } 505 506 /* extract parameters */ 507 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 508 509 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 510 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 511 512 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 513 514 id = qemu_opts_id(opts); 515 516 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 517 qdict_array_split(interval_dict, &interval_list); 518 519 if (qdict_size(interval_dict) != 0) { 520 error_setg(errp, "Invalid option stats-intervals.%s", 521 qdict_first(interval_dict)->key); 522 goto early_err; 523 } 524 525 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 526 &detect_zeroes, &error); 527 if (error) { 528 error_propagate(errp, error); 529 goto early_err; 530 } 531 532 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 533 if (is_help_option(buf)) { 534 qemu_printf("Supported formats:"); 535 bdrv_iterate_format(bdrv_format_print, NULL, false); 536 qemu_printf("\nSupported formats (read-only):"); 537 bdrv_iterate_format(bdrv_format_print, NULL, true); 538 qemu_printf("\n"); 539 goto early_err; 540 } 541 542 if (qdict_haskey(bs_opts, "driver")) { 543 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 544 goto early_err; 545 } 546 qdict_put_str(bs_opts, "driver", buf); 547 } 548 549 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 550 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 551 on_write_error = parse_block_error_action(buf, 0, &error); 552 if (error) { 553 error_propagate(errp, error); 554 goto early_err; 555 } 556 } 557 558 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 559 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 560 on_read_error = parse_block_error_action(buf, 1, &error); 561 if (error) { 562 error_propagate(errp, error); 563 goto early_err; 564 } 565 } 566 567 if (snapshot) { 568 bdrv_flags |= BDRV_O_SNAPSHOT; 569 } 570 571 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 572 573 /* init */ 574 if ((!file || !*file) && !qdict_size(bs_opts)) { 575 BlockBackendRootState *blk_rs; 576 577 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 578 blk_rs = blk_get_root_state(blk); 579 blk_rs->open_flags = bdrv_flags; 580 blk_rs->read_only = read_only; 581 blk_rs->detect_zeroes = detect_zeroes; 582 583 qobject_unref(bs_opts); 584 } else { 585 if (file && !*file) { 586 file = NULL; 587 } 588 589 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 590 * with other callers) rather than what we want as the real defaults. 591 * Apply the defaults here instead. */ 592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 594 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 595 read_only ? "on" : "off"); 596 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 597 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 598 599 if (runstate_check(RUN_STATE_INMIGRATE)) { 600 bdrv_flags |= BDRV_O_INACTIVE; 601 } 602 603 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 604 if (!blk) { 605 goto err_no_bs_opts; 606 } 607 bs = blk_bs(blk); 608 609 bs->detect_zeroes = detect_zeroes; 610 611 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 612 613 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 614 blk_unref(blk); 615 blk = NULL; 616 goto err_no_bs_opts; 617 } 618 } 619 620 /* disk I/O throttling */ 621 if (throttle_enabled(&cfg)) { 622 if (!throttling_group) { 623 throttling_group = id; 624 } 625 blk_io_limits_enable(blk, throttling_group); 626 blk_set_io_limits(blk, &cfg); 627 } 628 629 blk_set_enable_write_cache(blk, !writethrough); 630 blk_set_on_error(blk, on_read_error, on_write_error); 631 632 if (!monitor_add_blk(blk, id, errp)) { 633 blk_unref(blk); 634 blk = NULL; 635 goto err_no_bs_opts; 636 } 637 638 err_no_bs_opts: 639 qemu_opts_del(opts); 640 qobject_unref(interval_dict); 641 qobject_unref(interval_list); 642 return blk; 643 644 early_err: 645 qemu_opts_del(opts); 646 qobject_unref(interval_dict); 647 qobject_unref(interval_list); 648 err_no_opts: 649 qobject_unref(bs_opts); 650 return NULL; 651 } 652 653 /* Takes the ownership of bs_opts */ 654 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 655 { 656 int bdrv_flags = 0; 657 658 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 659 * with other callers) rather than what we want as the real defaults. 660 * Apply the defaults here instead. */ 661 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 662 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 663 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 664 665 if (runstate_check(RUN_STATE_INMIGRATE)) { 666 bdrv_flags |= BDRV_O_INACTIVE; 667 } 668 669 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 670 } 671 672 void blockdev_close_all_bdrv_states(void) 673 { 674 BlockDriverState *bs, *next_bs; 675 676 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 677 AioContext *ctx = bdrv_get_aio_context(bs); 678 679 aio_context_acquire(ctx); 680 bdrv_unref(bs); 681 aio_context_release(ctx); 682 } 683 } 684 685 /* Iterates over the list of monitor-owned BlockDriverStates */ 686 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 687 { 688 return bs ? QTAILQ_NEXT(bs, monitor_list) 689 : QTAILQ_FIRST(&monitor_bdrv_states); 690 } 691 692 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 693 Error **errp) 694 { 695 const char *value; 696 697 value = qemu_opt_get(opts, from); 698 if (value) { 699 if (qemu_opt_find(opts, to)) { 700 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 701 "same time", to, from); 702 return; 703 } 704 } 705 706 /* rename all items in opts */ 707 while ((value = qemu_opt_get(opts, from))) { 708 qemu_opt_set(opts, to, value, &error_abort); 709 qemu_opt_unset(opts, from); 710 } 711 } 712 713 QemuOptsList qemu_legacy_drive_opts = { 714 .name = "drive", 715 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 716 .desc = { 717 { 718 .name = "bus", 719 .type = QEMU_OPT_NUMBER, 720 .help = "bus number", 721 },{ 722 .name = "unit", 723 .type = QEMU_OPT_NUMBER, 724 .help = "unit number (i.e. lun for scsi)", 725 },{ 726 .name = "index", 727 .type = QEMU_OPT_NUMBER, 728 .help = "index number", 729 },{ 730 .name = "media", 731 .type = QEMU_OPT_STRING, 732 .help = "media type (disk, cdrom)", 733 },{ 734 .name = "if", 735 .type = QEMU_OPT_STRING, 736 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 737 },{ 738 .name = "file", 739 .type = QEMU_OPT_STRING, 740 .help = "file name", 741 }, 742 743 /* Options that are passed on, but have special semantics with -drive */ 744 { 745 .name = BDRV_OPT_READ_ONLY, 746 .type = QEMU_OPT_BOOL, 747 .help = "open drive file as read-only", 748 },{ 749 .name = "rerror", 750 .type = QEMU_OPT_STRING, 751 .help = "read error action", 752 },{ 753 .name = "werror", 754 .type = QEMU_OPT_STRING, 755 .help = "write error action", 756 },{ 757 .name = "copy-on-read", 758 .type = QEMU_OPT_BOOL, 759 .help = "copy read data from backing file into image file", 760 }, 761 762 { /* end of list */ } 763 }, 764 }; 765 766 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 767 Error **errp) 768 { 769 const char *value; 770 BlockBackend *blk; 771 DriveInfo *dinfo = NULL; 772 QDict *bs_opts; 773 QemuOpts *legacy_opts; 774 DriveMediaType media = MEDIA_DISK; 775 BlockInterfaceType type; 776 int max_devs, bus_id, unit_id, index; 777 const char *werror, *rerror; 778 bool read_only = false; 779 bool copy_on_read; 780 const char *filename; 781 Error *local_err = NULL; 782 int i; 783 784 /* Change legacy command line options into QMP ones */ 785 static const struct { 786 const char *from; 787 const char *to; 788 } opt_renames[] = { 789 { "iops", "throttling.iops-total" }, 790 { "iops_rd", "throttling.iops-read" }, 791 { "iops_wr", "throttling.iops-write" }, 792 793 { "bps", "throttling.bps-total" }, 794 { "bps_rd", "throttling.bps-read" }, 795 { "bps_wr", "throttling.bps-write" }, 796 797 { "iops_max", "throttling.iops-total-max" }, 798 { "iops_rd_max", "throttling.iops-read-max" }, 799 { "iops_wr_max", "throttling.iops-write-max" }, 800 801 { "bps_max", "throttling.bps-total-max" }, 802 { "bps_rd_max", "throttling.bps-read-max" }, 803 { "bps_wr_max", "throttling.bps-write-max" }, 804 805 { "iops_size", "throttling.iops-size" }, 806 807 { "group", "throttling.group" }, 808 809 { "readonly", BDRV_OPT_READ_ONLY }, 810 }; 811 812 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 813 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 814 &local_err); 815 if (local_err) { 816 error_propagate(errp, local_err); 817 return NULL; 818 } 819 } 820 821 value = qemu_opt_get(all_opts, "cache"); 822 if (value) { 823 int flags = 0; 824 bool writethrough; 825 826 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 827 error_setg(errp, "invalid cache option"); 828 return NULL; 829 } 830 831 /* Specific options take precedence */ 832 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 833 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 834 !writethrough, &error_abort); 835 } 836 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 837 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 838 !!(flags & BDRV_O_NOCACHE), &error_abort); 839 } 840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 842 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 843 } 844 qemu_opt_unset(all_opts, "cache"); 845 } 846 847 /* Get a QDict for processing the options */ 848 bs_opts = qdict_new(); 849 qemu_opts_to_qdict(all_opts, bs_opts); 850 851 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 852 &error_abort); 853 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 854 if (local_err) { 855 error_propagate(errp, local_err); 856 goto fail; 857 } 858 859 /* Media type */ 860 value = qemu_opt_get(legacy_opts, "media"); 861 if (value) { 862 if (!strcmp(value, "disk")) { 863 media = MEDIA_DISK; 864 } else if (!strcmp(value, "cdrom")) { 865 media = MEDIA_CDROM; 866 read_only = true; 867 } else { 868 error_setg(errp, "'%s' invalid media", value); 869 goto fail; 870 } 871 } 872 873 /* copy-on-read is disabled with a warning for read-only devices */ 874 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 875 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 876 877 if (read_only && copy_on_read) { 878 warn_report("disabling copy-on-read on read-only drive"); 879 copy_on_read = false; 880 } 881 882 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 883 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 884 885 /* Controller type */ 886 value = qemu_opt_get(legacy_opts, "if"); 887 if (value) { 888 for (type = 0; 889 type < IF_COUNT && strcmp(value, if_name[type]); 890 type++) { 891 } 892 if (type == IF_COUNT) { 893 error_setg(errp, "unsupported bus type '%s'", value); 894 goto fail; 895 } 896 } else { 897 type = block_default_type; 898 } 899 900 /* Device address specified by bus/unit or index. 901 * If none was specified, try to find the first free one. */ 902 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 903 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 904 index = qemu_opt_get_number(legacy_opts, "index", -1); 905 906 max_devs = if_max_devs[type]; 907 908 if (index != -1) { 909 if (bus_id != 0 || unit_id != -1) { 910 error_setg(errp, "index cannot be used with bus and unit"); 911 goto fail; 912 } 913 bus_id = drive_index_to_bus_id(type, index); 914 unit_id = drive_index_to_unit_id(type, index); 915 } 916 917 if (unit_id == -1) { 918 unit_id = 0; 919 while (drive_get(type, bus_id, unit_id) != NULL) { 920 unit_id++; 921 if (max_devs && unit_id >= max_devs) { 922 unit_id -= max_devs; 923 bus_id++; 924 } 925 } 926 } 927 928 if (max_devs && unit_id >= max_devs) { 929 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 930 goto fail; 931 } 932 933 if (drive_get(type, bus_id, unit_id) != NULL) { 934 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 935 bus_id, unit_id, index); 936 goto fail; 937 } 938 939 /* no id supplied -> create one */ 940 if (qemu_opts_id(all_opts) == NULL) { 941 char *new_id; 942 const char *mediastr = ""; 943 if (type == IF_IDE || type == IF_SCSI) { 944 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 945 } 946 if (max_devs) { 947 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 948 mediastr, unit_id); 949 } else { 950 new_id = g_strdup_printf("%s%s%i", if_name[type], 951 mediastr, unit_id); 952 } 953 qdict_put_str(bs_opts, "id", new_id); 954 g_free(new_id); 955 } 956 957 /* Add virtio block device */ 958 if (type == IF_VIRTIO) { 959 QemuOpts *devopts; 960 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 961 &error_abort); 962 if (arch_type == QEMU_ARCH_S390X) { 963 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 964 } else { 965 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 966 } 967 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 968 &error_abort); 969 } 970 971 filename = qemu_opt_get(legacy_opts, "file"); 972 973 /* Check werror/rerror compatibility with if=... */ 974 werror = qemu_opt_get(legacy_opts, "werror"); 975 if (werror != NULL) { 976 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 977 type != IF_NONE) { 978 error_setg(errp, "werror is not supported by this bus type"); 979 goto fail; 980 } 981 qdict_put_str(bs_opts, "werror", werror); 982 } 983 984 rerror = qemu_opt_get(legacy_opts, "rerror"); 985 if (rerror != NULL) { 986 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 987 type != IF_NONE) { 988 error_setg(errp, "rerror is not supported by this bus type"); 989 goto fail; 990 } 991 qdict_put_str(bs_opts, "rerror", rerror); 992 } 993 994 /* Actual block device init: Functionality shared with blockdev-add */ 995 blk = blockdev_init(filename, bs_opts, &local_err); 996 bs_opts = NULL; 997 if (!blk) { 998 error_propagate(errp, local_err); 999 goto fail; 1000 } else { 1001 assert(!local_err); 1002 } 1003 1004 /* Create legacy DriveInfo */ 1005 dinfo = g_malloc0(sizeof(*dinfo)); 1006 dinfo->opts = all_opts; 1007 1008 dinfo->type = type; 1009 dinfo->bus = bus_id; 1010 dinfo->unit = unit_id; 1011 1012 blk_set_legacy_dinfo(blk, dinfo); 1013 1014 switch(type) { 1015 case IF_IDE: 1016 case IF_SCSI: 1017 case IF_XEN: 1018 case IF_NONE: 1019 dinfo->media_cd = media == MEDIA_CDROM; 1020 break; 1021 default: 1022 break; 1023 } 1024 1025 fail: 1026 qemu_opts_del(legacy_opts); 1027 qobject_unref(bs_opts); 1028 return dinfo; 1029 } 1030 1031 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1032 { 1033 BlockDriverState *bs; 1034 1035 bs = bdrv_lookup_bs(name, name, errp); 1036 if (bs == NULL) { 1037 return NULL; 1038 } 1039 1040 if (!bdrv_is_root_node(bs)) { 1041 error_setg(errp, "Need a root block node"); 1042 return NULL; 1043 } 1044 1045 if (!bdrv_is_inserted(bs)) { 1046 error_setg(errp, "Device has no medium"); 1047 return NULL; 1048 } 1049 1050 return bs; 1051 } 1052 1053 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1054 Error **errp) 1055 { 1056 BlockBackend *blk; 1057 1058 if (!blk_name == !qdev_id) { 1059 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1060 return NULL; 1061 } 1062 1063 if (qdev_id) { 1064 blk = blk_by_qdev_id(qdev_id, errp); 1065 } else { 1066 blk = blk_by_name(blk_name); 1067 if (blk == NULL) { 1068 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1069 "Device '%s' not found", blk_name); 1070 } 1071 } 1072 1073 return blk; 1074 } 1075 1076 void hmp_commit(Monitor *mon, const QDict *qdict) 1077 { 1078 const char *device = qdict_get_str(qdict, "device"); 1079 BlockBackend *blk; 1080 int ret; 1081 1082 if (!strcmp(device, "all")) { 1083 ret = blk_commit_all(); 1084 } else { 1085 BlockDriverState *bs; 1086 AioContext *aio_context; 1087 1088 blk = blk_by_name(device); 1089 if (!blk) { 1090 monitor_printf(mon, "Device '%s' not found\n", device); 1091 return; 1092 } 1093 if (!blk_is_available(blk)) { 1094 monitor_printf(mon, "Device '%s' has no medium\n", device); 1095 return; 1096 } 1097 1098 bs = blk_bs(blk); 1099 aio_context = bdrv_get_aio_context(bs); 1100 aio_context_acquire(aio_context); 1101 1102 ret = bdrv_commit(bs); 1103 1104 aio_context_release(aio_context); 1105 } 1106 if (ret < 0) { 1107 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1108 strerror(-ret)); 1109 } 1110 } 1111 1112 static void blockdev_do_action(TransactionAction *action, Error **errp) 1113 { 1114 TransactionActionList list; 1115 1116 list.value = action; 1117 list.next = NULL; 1118 qmp_transaction(&list, false, NULL, errp); 1119 } 1120 1121 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1122 bool has_node_name, const char *node_name, 1123 const char *snapshot_file, 1124 bool has_snapshot_node_name, 1125 const char *snapshot_node_name, 1126 bool has_format, const char *format, 1127 bool has_mode, NewImageMode mode, Error **errp) 1128 { 1129 BlockdevSnapshotSync snapshot = { 1130 .has_device = has_device, 1131 .device = (char *) device, 1132 .has_node_name = has_node_name, 1133 .node_name = (char *) node_name, 1134 .snapshot_file = (char *) snapshot_file, 1135 .has_snapshot_node_name = has_snapshot_node_name, 1136 .snapshot_node_name = (char *) snapshot_node_name, 1137 .has_format = has_format, 1138 .format = (char *) format, 1139 .has_mode = has_mode, 1140 .mode = mode, 1141 }; 1142 TransactionAction action = { 1143 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1144 .u.blockdev_snapshot_sync.data = &snapshot, 1145 }; 1146 blockdev_do_action(&action, errp); 1147 } 1148 1149 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1150 Error **errp) 1151 { 1152 BlockdevSnapshot snapshot_data = { 1153 .node = (char *) node, 1154 .overlay = (char *) overlay 1155 }; 1156 TransactionAction action = { 1157 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1158 .u.blockdev_snapshot.data = &snapshot_data, 1159 }; 1160 blockdev_do_action(&action, errp); 1161 } 1162 1163 void qmp_blockdev_snapshot_internal_sync(const char *device, 1164 const char *name, 1165 Error **errp) 1166 { 1167 BlockdevSnapshotInternal snapshot = { 1168 .device = (char *) device, 1169 .name = (char *) name 1170 }; 1171 TransactionAction action = { 1172 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1173 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1174 }; 1175 blockdev_do_action(&action, errp); 1176 } 1177 1178 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1179 bool has_id, 1180 const char *id, 1181 bool has_name, 1182 const char *name, 1183 Error **errp) 1184 { 1185 BlockDriverState *bs; 1186 AioContext *aio_context; 1187 QEMUSnapshotInfo sn; 1188 Error *local_err = NULL; 1189 SnapshotInfo *info = NULL; 1190 int ret; 1191 1192 bs = qmp_get_root_bs(device, errp); 1193 if (!bs) { 1194 return NULL; 1195 } 1196 aio_context = bdrv_get_aio_context(bs); 1197 aio_context_acquire(aio_context); 1198 1199 if (!has_id) { 1200 id = NULL; 1201 } 1202 1203 if (!has_name) { 1204 name = NULL; 1205 } 1206 1207 if (!id && !name) { 1208 error_setg(errp, "Name or id must be provided"); 1209 goto out_aio_context; 1210 } 1211 1212 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1213 goto out_aio_context; 1214 } 1215 1216 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1217 if (local_err) { 1218 error_propagate(errp, local_err); 1219 goto out_aio_context; 1220 } 1221 if (!ret) { 1222 error_setg(errp, 1223 "Snapshot with id '%s' and name '%s' does not exist on " 1224 "device '%s'", 1225 STR_OR_NULL(id), STR_OR_NULL(name), device); 1226 goto out_aio_context; 1227 } 1228 1229 bdrv_snapshot_delete(bs, id, name, &local_err); 1230 if (local_err) { 1231 error_propagate(errp, local_err); 1232 goto out_aio_context; 1233 } 1234 1235 aio_context_release(aio_context); 1236 1237 info = g_new0(SnapshotInfo, 1); 1238 info->id = g_strdup(sn.id_str); 1239 info->name = g_strdup(sn.name); 1240 info->date_nsec = sn.date_nsec; 1241 info->date_sec = sn.date_sec; 1242 info->vm_state_size = sn.vm_state_size; 1243 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1244 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1245 1246 return info; 1247 1248 out_aio_context: 1249 aio_context_release(aio_context); 1250 return NULL; 1251 } 1252 1253 /** 1254 * block_dirty_bitmap_lookup: 1255 * Return a dirty bitmap (if present), after validating 1256 * the node reference and bitmap names. 1257 * 1258 * @node: The name of the BDS node to search for bitmaps 1259 * @name: The name of the bitmap to search for 1260 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1261 * @errp: Output pointer for error information. Can be NULL. 1262 * 1263 * @return: A bitmap object on success, or NULL on failure. 1264 */ 1265 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1266 const char *name, 1267 BlockDriverState **pbs, 1268 Error **errp) 1269 { 1270 BlockDriverState *bs; 1271 BdrvDirtyBitmap *bitmap; 1272 1273 if (!node) { 1274 error_setg(errp, "Node cannot be NULL"); 1275 return NULL; 1276 } 1277 if (!name) { 1278 error_setg(errp, "Bitmap name cannot be NULL"); 1279 return NULL; 1280 } 1281 bs = bdrv_lookup_bs(node, node, NULL); 1282 if (!bs) { 1283 error_setg(errp, "Node '%s' not found", node); 1284 return NULL; 1285 } 1286 1287 bitmap = bdrv_find_dirty_bitmap(bs, name); 1288 if (!bitmap) { 1289 error_setg(errp, "Dirty bitmap '%s' not found", name); 1290 return NULL; 1291 } 1292 1293 if (pbs) { 1294 *pbs = bs; 1295 } 1296 1297 return bitmap; 1298 } 1299 1300 /* New and old BlockDriverState structs for atomic group operations */ 1301 1302 typedef struct BlkActionState BlkActionState; 1303 1304 /** 1305 * BlkActionOps: 1306 * Table of operations that define an Action. 1307 * 1308 * @instance_size: Size of state struct, in bytes. 1309 * @prepare: Prepare the work, must NOT be NULL. 1310 * @commit: Commit the changes, can be NULL. 1311 * @abort: Abort the changes on fail, can be NULL. 1312 * @clean: Clean up resources after all transaction actions have called 1313 * commit() or abort(). Can be NULL. 1314 * 1315 * Only prepare() may fail. In a single transaction, only one of commit() or 1316 * abort() will be called. clean() will always be called if it is present. 1317 */ 1318 typedef struct BlkActionOps { 1319 size_t instance_size; 1320 void (*prepare)(BlkActionState *common, Error **errp); 1321 void (*commit)(BlkActionState *common); 1322 void (*abort)(BlkActionState *common); 1323 void (*clean)(BlkActionState *common); 1324 } BlkActionOps; 1325 1326 /** 1327 * BlkActionState: 1328 * Describes one Action's state within a Transaction. 1329 * 1330 * @action: QAPI-defined enum identifying which Action to perform. 1331 * @ops: Table of ActionOps this Action can perform. 1332 * @block_job_txn: Transaction which this action belongs to. 1333 * @entry: List membership for all Actions in this Transaction. 1334 * 1335 * This structure must be arranged as first member in a subclassed type, 1336 * assuming that the compiler will also arrange it to the same offsets as the 1337 * base class. 1338 */ 1339 struct BlkActionState { 1340 TransactionAction *action; 1341 const BlkActionOps *ops; 1342 JobTxn *block_job_txn; 1343 TransactionProperties *txn_props; 1344 QTAILQ_ENTRY(BlkActionState) entry; 1345 }; 1346 1347 /* internal snapshot private data */ 1348 typedef struct InternalSnapshotState { 1349 BlkActionState common; 1350 BlockDriverState *bs; 1351 QEMUSnapshotInfo sn; 1352 bool created; 1353 } InternalSnapshotState; 1354 1355 1356 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1357 { 1358 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1359 error_setg(errp, 1360 "Action '%s' does not support Transaction property " 1361 "completion-mode = %s", 1362 TransactionActionKind_str(s->action->type), 1363 ActionCompletionMode_str(s->txn_props->completion_mode)); 1364 return -1; 1365 } 1366 return 0; 1367 } 1368 1369 static void internal_snapshot_prepare(BlkActionState *common, 1370 Error **errp) 1371 { 1372 Error *local_err = NULL; 1373 const char *device; 1374 const char *name; 1375 BlockDriverState *bs; 1376 QEMUSnapshotInfo old_sn, *sn; 1377 bool ret; 1378 qemu_timeval tv; 1379 BlockdevSnapshotInternal *internal; 1380 InternalSnapshotState *state; 1381 AioContext *aio_context; 1382 int ret1; 1383 1384 g_assert(common->action->type == 1385 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1386 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1387 state = DO_UPCAST(InternalSnapshotState, common, common); 1388 1389 /* 1. parse input */ 1390 device = internal->device; 1391 name = internal->name; 1392 1393 /* 2. check for validation */ 1394 if (action_check_completion_mode(common, errp) < 0) { 1395 return; 1396 } 1397 1398 bs = qmp_get_root_bs(device, errp); 1399 if (!bs) { 1400 return; 1401 } 1402 1403 aio_context = bdrv_get_aio_context(bs); 1404 aio_context_acquire(aio_context); 1405 1406 state->bs = bs; 1407 1408 /* Paired with .clean() */ 1409 bdrv_drained_begin(bs); 1410 1411 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1412 goto out; 1413 } 1414 1415 if (bdrv_is_read_only(bs)) { 1416 error_setg(errp, "Device '%s' is read only", device); 1417 goto out; 1418 } 1419 1420 if (!bdrv_can_snapshot(bs)) { 1421 error_setg(errp, "Block format '%s' used by device '%s' " 1422 "does not support internal snapshots", 1423 bs->drv->format_name, device); 1424 goto out; 1425 } 1426 1427 if (!strlen(name)) { 1428 error_setg(errp, "Name is empty"); 1429 goto out; 1430 } 1431 1432 /* check whether a snapshot with name exist */ 1433 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1434 &local_err); 1435 if (local_err) { 1436 error_propagate(errp, local_err); 1437 goto out; 1438 } else if (ret) { 1439 error_setg(errp, 1440 "Snapshot with name '%s' already exists on device '%s'", 1441 name, device); 1442 goto out; 1443 } 1444 1445 /* 3. take the snapshot */ 1446 sn = &state->sn; 1447 pstrcpy(sn->name, sizeof(sn->name), name); 1448 qemu_gettimeofday(&tv); 1449 sn->date_sec = tv.tv_sec; 1450 sn->date_nsec = tv.tv_usec * 1000; 1451 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1452 1453 ret1 = bdrv_snapshot_create(bs, sn); 1454 if (ret1 < 0) { 1455 error_setg_errno(errp, -ret1, 1456 "Failed to create snapshot '%s' on device '%s'", 1457 name, device); 1458 goto out; 1459 } 1460 1461 /* 4. succeed, mark a snapshot is created */ 1462 state->created = true; 1463 1464 out: 1465 aio_context_release(aio_context); 1466 } 1467 1468 static void internal_snapshot_abort(BlkActionState *common) 1469 { 1470 InternalSnapshotState *state = 1471 DO_UPCAST(InternalSnapshotState, common, common); 1472 BlockDriverState *bs = state->bs; 1473 QEMUSnapshotInfo *sn = &state->sn; 1474 AioContext *aio_context; 1475 Error *local_error = NULL; 1476 1477 if (!state->created) { 1478 return; 1479 } 1480 1481 aio_context = bdrv_get_aio_context(state->bs); 1482 aio_context_acquire(aio_context); 1483 1484 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1485 error_reportf_err(local_error, 1486 "Failed to delete snapshot with id '%s' and " 1487 "name '%s' on device '%s' in abort: ", 1488 sn->id_str, sn->name, 1489 bdrv_get_device_name(bs)); 1490 } 1491 1492 aio_context_release(aio_context); 1493 } 1494 1495 static void internal_snapshot_clean(BlkActionState *common) 1496 { 1497 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1498 common, common); 1499 AioContext *aio_context; 1500 1501 if (!state->bs) { 1502 return; 1503 } 1504 1505 aio_context = bdrv_get_aio_context(state->bs); 1506 aio_context_acquire(aio_context); 1507 1508 bdrv_drained_end(state->bs); 1509 1510 aio_context_release(aio_context); 1511 } 1512 1513 /* external snapshot private data */ 1514 typedef struct ExternalSnapshotState { 1515 BlkActionState common; 1516 BlockDriverState *old_bs; 1517 BlockDriverState *new_bs; 1518 bool overlay_appended; 1519 } ExternalSnapshotState; 1520 1521 static void external_snapshot_prepare(BlkActionState *common, 1522 Error **errp) 1523 { 1524 int flags = 0; 1525 QDict *options = NULL; 1526 Error *local_err = NULL; 1527 /* Device and node name of the image to generate the snapshot from */ 1528 const char *device; 1529 const char *node_name; 1530 /* Reference to the new image (for 'blockdev-snapshot') */ 1531 const char *snapshot_ref; 1532 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1533 const char *new_image_file; 1534 ExternalSnapshotState *state = 1535 DO_UPCAST(ExternalSnapshotState, common, common); 1536 TransactionAction *action = common->action; 1537 AioContext *aio_context; 1538 int ret; 1539 1540 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1541 * purpose but a different set of parameters */ 1542 switch (action->type) { 1543 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1544 { 1545 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1546 device = s->node; 1547 node_name = s->node; 1548 new_image_file = NULL; 1549 snapshot_ref = s->overlay; 1550 } 1551 break; 1552 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1553 { 1554 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1555 device = s->has_device ? s->device : NULL; 1556 node_name = s->has_node_name ? s->node_name : NULL; 1557 new_image_file = s->snapshot_file; 1558 snapshot_ref = NULL; 1559 } 1560 break; 1561 default: 1562 g_assert_not_reached(); 1563 } 1564 1565 /* start processing */ 1566 if (action_check_completion_mode(common, errp) < 0) { 1567 return; 1568 } 1569 1570 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1571 if (!state->old_bs) { 1572 return; 1573 } 1574 1575 aio_context = bdrv_get_aio_context(state->old_bs); 1576 aio_context_acquire(aio_context); 1577 1578 /* Paired with .clean() */ 1579 bdrv_drained_begin(state->old_bs); 1580 1581 if (!bdrv_is_inserted(state->old_bs)) { 1582 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1583 goto out; 1584 } 1585 1586 if (bdrv_op_is_blocked(state->old_bs, 1587 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1588 goto out; 1589 } 1590 1591 if (!bdrv_is_read_only(state->old_bs)) { 1592 if (bdrv_flush(state->old_bs)) { 1593 error_setg(errp, QERR_IO_ERROR); 1594 goto out; 1595 } 1596 } 1597 1598 if (!bdrv_is_first_non_filter(state->old_bs)) { 1599 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1600 goto out; 1601 } 1602 1603 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1604 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1605 const char *format = s->has_format ? s->format : "qcow2"; 1606 enum NewImageMode mode; 1607 const char *snapshot_node_name = 1608 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1609 1610 if (node_name && !snapshot_node_name) { 1611 error_setg(errp, "New overlay node name missing"); 1612 goto out; 1613 } 1614 1615 if (snapshot_node_name && 1616 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1617 error_setg(errp, "New overlay node name already in use"); 1618 goto out; 1619 } 1620 1621 flags = state->old_bs->open_flags; 1622 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1623 flags |= BDRV_O_NO_BACKING; 1624 1625 /* create new image w/backing file */ 1626 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1627 if (mode != NEW_IMAGE_MODE_EXISTING) { 1628 int64_t size = bdrv_getlength(state->old_bs); 1629 if (size < 0) { 1630 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1631 goto out; 1632 } 1633 bdrv_refresh_filename(state->old_bs); 1634 bdrv_img_create(new_image_file, format, 1635 state->old_bs->filename, 1636 state->old_bs->drv->format_name, 1637 NULL, size, flags, false, &local_err); 1638 if (local_err) { 1639 error_propagate(errp, local_err); 1640 goto out; 1641 } 1642 } 1643 1644 options = qdict_new(); 1645 if (snapshot_node_name) { 1646 qdict_put_str(options, "node-name", snapshot_node_name); 1647 } 1648 qdict_put_str(options, "driver", format); 1649 } 1650 1651 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1652 errp); 1653 /* We will manually add the backing_hd field to the bs later */ 1654 if (!state->new_bs) { 1655 goto out; 1656 } 1657 1658 if (bdrv_has_blk(state->new_bs)) { 1659 error_setg(errp, "The overlay is already in use"); 1660 goto out; 1661 } 1662 1663 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1664 errp)) { 1665 goto out; 1666 } 1667 1668 if (state->new_bs->backing != NULL) { 1669 error_setg(errp, "The overlay already has a backing image"); 1670 goto out; 1671 } 1672 1673 if (!state->new_bs->drv->supports_backing) { 1674 error_setg(errp, "The overlay does not support backing images"); 1675 goto out; 1676 } 1677 1678 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp); 1679 if (ret < 0) { 1680 goto out; 1681 } 1682 1683 /* This removes our old bs and adds the new bs. This is an operation that 1684 * can fail, so we need to do it in .prepare; undoing it for abort is 1685 * always possible. */ 1686 bdrv_ref(state->new_bs); 1687 bdrv_append(state->new_bs, state->old_bs, &local_err); 1688 if (local_err) { 1689 error_propagate(errp, local_err); 1690 goto out; 1691 } 1692 state->overlay_appended = true; 1693 1694 out: 1695 aio_context_release(aio_context); 1696 } 1697 1698 static void external_snapshot_commit(BlkActionState *common) 1699 { 1700 ExternalSnapshotState *state = 1701 DO_UPCAST(ExternalSnapshotState, common, common); 1702 AioContext *aio_context; 1703 1704 aio_context = bdrv_get_aio_context(state->old_bs); 1705 aio_context_acquire(aio_context); 1706 1707 /* We don't need (or want) to use the transactional 1708 * bdrv_reopen_multiple() across all the entries at once, because we 1709 * don't want to abort all of them if one of them fails the reopen */ 1710 if (!atomic_read(&state->old_bs->copy_on_read)) { 1711 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1712 } 1713 1714 aio_context_release(aio_context); 1715 } 1716 1717 static void external_snapshot_abort(BlkActionState *common) 1718 { 1719 ExternalSnapshotState *state = 1720 DO_UPCAST(ExternalSnapshotState, common, common); 1721 if (state->new_bs) { 1722 if (state->overlay_appended) { 1723 AioContext *aio_context; 1724 1725 aio_context = bdrv_get_aio_context(state->old_bs); 1726 aio_context_acquire(aio_context); 1727 1728 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1729 close state->old_bs; we need it */ 1730 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1731 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1732 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1733 1734 aio_context_release(aio_context); 1735 } 1736 } 1737 } 1738 1739 static void external_snapshot_clean(BlkActionState *common) 1740 { 1741 ExternalSnapshotState *state = 1742 DO_UPCAST(ExternalSnapshotState, common, common); 1743 AioContext *aio_context; 1744 1745 if (!state->old_bs) { 1746 return; 1747 } 1748 1749 aio_context = bdrv_get_aio_context(state->old_bs); 1750 aio_context_acquire(aio_context); 1751 1752 bdrv_drained_end(state->old_bs); 1753 bdrv_unref(state->new_bs); 1754 1755 aio_context_release(aio_context); 1756 } 1757 1758 typedef struct DriveBackupState { 1759 BlkActionState common; 1760 BlockDriverState *bs; 1761 BlockJob *job; 1762 } DriveBackupState; 1763 1764 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1765 Error **errp); 1766 1767 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1768 { 1769 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1770 BlockDriverState *bs; 1771 DriveBackup *backup; 1772 AioContext *aio_context; 1773 Error *local_err = NULL; 1774 1775 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1776 backup = common->action->u.drive_backup.data; 1777 1778 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1779 if (!bs) { 1780 return; 1781 } 1782 1783 aio_context = bdrv_get_aio_context(bs); 1784 aio_context_acquire(aio_context); 1785 1786 /* Paired with .clean() */ 1787 bdrv_drained_begin(bs); 1788 1789 state->bs = bs; 1790 1791 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1792 if (local_err) { 1793 error_propagate(errp, local_err); 1794 goto out; 1795 } 1796 1797 out: 1798 aio_context_release(aio_context); 1799 } 1800 1801 static void drive_backup_commit(BlkActionState *common) 1802 { 1803 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1804 AioContext *aio_context; 1805 1806 aio_context = bdrv_get_aio_context(state->bs); 1807 aio_context_acquire(aio_context); 1808 1809 assert(state->job); 1810 job_start(&state->job->job); 1811 1812 aio_context_release(aio_context); 1813 } 1814 1815 static void drive_backup_abort(BlkActionState *common) 1816 { 1817 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1818 1819 if (state->job) { 1820 AioContext *aio_context; 1821 1822 aio_context = bdrv_get_aio_context(state->bs); 1823 aio_context_acquire(aio_context); 1824 1825 job_cancel_sync(&state->job->job); 1826 1827 aio_context_release(aio_context); 1828 } 1829 } 1830 1831 static void drive_backup_clean(BlkActionState *common) 1832 { 1833 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1834 AioContext *aio_context; 1835 1836 if (!state->bs) { 1837 return; 1838 } 1839 1840 aio_context = bdrv_get_aio_context(state->bs); 1841 aio_context_acquire(aio_context); 1842 1843 bdrv_drained_end(state->bs); 1844 1845 aio_context_release(aio_context); 1846 } 1847 1848 typedef struct BlockdevBackupState { 1849 BlkActionState common; 1850 BlockDriverState *bs; 1851 BlockJob *job; 1852 } BlockdevBackupState; 1853 1854 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1855 Error **errp); 1856 1857 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1858 { 1859 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1860 BlockdevBackup *backup; 1861 BlockDriverState *bs, *target; 1862 AioContext *aio_context; 1863 Error *local_err = NULL; 1864 1865 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1866 backup = common->action->u.blockdev_backup.data; 1867 1868 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1869 if (!bs) { 1870 return; 1871 } 1872 1873 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1874 if (!target) { 1875 return; 1876 } 1877 1878 aio_context = bdrv_get_aio_context(bs); 1879 aio_context_acquire(aio_context); 1880 state->bs = bs; 1881 1882 /* Paired with .clean() */ 1883 bdrv_drained_begin(state->bs); 1884 1885 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1886 if (local_err) { 1887 error_propagate(errp, local_err); 1888 goto out; 1889 } 1890 1891 out: 1892 aio_context_release(aio_context); 1893 } 1894 1895 static void blockdev_backup_commit(BlkActionState *common) 1896 { 1897 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1898 AioContext *aio_context; 1899 1900 aio_context = bdrv_get_aio_context(state->bs); 1901 aio_context_acquire(aio_context); 1902 1903 assert(state->job); 1904 job_start(&state->job->job); 1905 1906 aio_context_release(aio_context); 1907 } 1908 1909 static void blockdev_backup_abort(BlkActionState *common) 1910 { 1911 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1912 1913 if (state->job) { 1914 AioContext *aio_context; 1915 1916 aio_context = bdrv_get_aio_context(state->bs); 1917 aio_context_acquire(aio_context); 1918 1919 job_cancel_sync(&state->job->job); 1920 1921 aio_context_release(aio_context); 1922 } 1923 } 1924 1925 static void blockdev_backup_clean(BlkActionState *common) 1926 { 1927 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1928 AioContext *aio_context; 1929 1930 if (!state->bs) { 1931 return; 1932 } 1933 1934 aio_context = bdrv_get_aio_context(state->bs); 1935 aio_context_acquire(aio_context); 1936 1937 bdrv_drained_end(state->bs); 1938 1939 aio_context_release(aio_context); 1940 } 1941 1942 typedef struct BlockDirtyBitmapState { 1943 BlkActionState common; 1944 BdrvDirtyBitmap *bitmap; 1945 BlockDriverState *bs; 1946 HBitmap *backup; 1947 bool prepared; 1948 bool was_enabled; 1949 } BlockDirtyBitmapState; 1950 1951 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1952 Error **errp) 1953 { 1954 Error *local_err = NULL; 1955 BlockDirtyBitmapAdd *action; 1956 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1957 common, common); 1958 1959 if (action_check_completion_mode(common, errp) < 0) { 1960 return; 1961 } 1962 1963 action = common->action->u.block_dirty_bitmap_add.data; 1964 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1965 qmp_block_dirty_bitmap_add(action->node, action->name, 1966 action->has_granularity, action->granularity, 1967 action->has_persistent, action->persistent, 1968 action->has_autoload, action->autoload, 1969 action->has_disabled, action->disabled, 1970 &local_err); 1971 1972 if (!local_err) { 1973 state->prepared = true; 1974 } else { 1975 error_propagate(errp, local_err); 1976 } 1977 } 1978 1979 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1980 { 1981 BlockDirtyBitmapAdd *action; 1982 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1983 common, common); 1984 1985 action = common->action->u.block_dirty_bitmap_add.data; 1986 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1987 * then the node reference and bitmap name must have been valid. 1988 */ 1989 if (state->prepared) { 1990 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1991 } 1992 } 1993 1994 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1995 Error **errp) 1996 { 1997 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1998 common, common); 1999 BlockDirtyBitmap *action; 2000 2001 if (action_check_completion_mode(common, errp) < 0) { 2002 return; 2003 } 2004 2005 action = common->action->u.block_dirty_bitmap_clear.data; 2006 state->bitmap = block_dirty_bitmap_lookup(action->node, 2007 action->name, 2008 &state->bs, 2009 errp); 2010 if (!state->bitmap) { 2011 return; 2012 } 2013 2014 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2015 return; 2016 } 2017 2018 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2019 } 2020 2021 static void block_dirty_bitmap_restore(BlkActionState *common) 2022 { 2023 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2024 common, common); 2025 2026 if (state->backup) { 2027 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2028 } 2029 } 2030 2031 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2032 { 2033 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2034 common, common); 2035 2036 hbitmap_free(state->backup); 2037 } 2038 2039 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2040 Error **errp) 2041 { 2042 BlockDirtyBitmap *action; 2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2044 common, common); 2045 2046 if (action_check_completion_mode(common, errp) < 0) { 2047 return; 2048 } 2049 2050 action = common->action->u.block_dirty_bitmap_enable.data; 2051 state->bitmap = block_dirty_bitmap_lookup(action->node, 2052 action->name, 2053 NULL, 2054 errp); 2055 if (!state->bitmap) { 2056 return; 2057 } 2058 2059 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2060 return; 2061 } 2062 2063 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2064 bdrv_enable_dirty_bitmap(state->bitmap); 2065 } 2066 2067 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2068 { 2069 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2070 common, common); 2071 2072 if (!state->was_enabled) { 2073 bdrv_disable_dirty_bitmap(state->bitmap); 2074 } 2075 } 2076 2077 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2078 Error **errp) 2079 { 2080 BlockDirtyBitmap *action; 2081 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2082 common, common); 2083 2084 if (action_check_completion_mode(common, errp) < 0) { 2085 return; 2086 } 2087 2088 action = common->action->u.block_dirty_bitmap_disable.data; 2089 state->bitmap = block_dirty_bitmap_lookup(action->node, 2090 action->name, 2091 NULL, 2092 errp); 2093 if (!state->bitmap) { 2094 return; 2095 } 2096 2097 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2098 return; 2099 } 2100 2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2102 bdrv_disable_dirty_bitmap(state->bitmap); 2103 } 2104 2105 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2106 { 2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2108 common, common); 2109 2110 if (state->was_enabled) { 2111 bdrv_enable_dirty_bitmap(state->bitmap); 2112 } 2113 } 2114 2115 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2116 const char *node, const char *target, 2117 BlockDirtyBitmapMergeSourceList *bitmaps, 2118 HBitmap **backup, Error **errp); 2119 2120 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2121 Error **errp) 2122 { 2123 BlockDirtyBitmapMerge *action; 2124 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2125 common, common); 2126 2127 if (action_check_completion_mode(common, errp) < 0) { 2128 return; 2129 } 2130 2131 action = common->action->u.block_dirty_bitmap_merge.data; 2132 2133 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2134 action->bitmaps, &state->backup, 2135 errp); 2136 } 2137 2138 static void abort_prepare(BlkActionState *common, Error **errp) 2139 { 2140 error_setg(errp, "Transaction aborted using Abort action"); 2141 } 2142 2143 static void abort_commit(BlkActionState *common) 2144 { 2145 g_assert_not_reached(); /* this action never succeeds */ 2146 } 2147 2148 static const BlkActionOps actions[] = { 2149 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2150 .instance_size = sizeof(ExternalSnapshotState), 2151 .prepare = external_snapshot_prepare, 2152 .commit = external_snapshot_commit, 2153 .abort = external_snapshot_abort, 2154 .clean = external_snapshot_clean, 2155 }, 2156 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2157 .instance_size = sizeof(ExternalSnapshotState), 2158 .prepare = external_snapshot_prepare, 2159 .commit = external_snapshot_commit, 2160 .abort = external_snapshot_abort, 2161 .clean = external_snapshot_clean, 2162 }, 2163 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2164 .instance_size = sizeof(DriveBackupState), 2165 .prepare = drive_backup_prepare, 2166 .commit = drive_backup_commit, 2167 .abort = drive_backup_abort, 2168 .clean = drive_backup_clean, 2169 }, 2170 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2171 .instance_size = sizeof(BlockdevBackupState), 2172 .prepare = blockdev_backup_prepare, 2173 .commit = blockdev_backup_commit, 2174 .abort = blockdev_backup_abort, 2175 .clean = blockdev_backup_clean, 2176 }, 2177 [TRANSACTION_ACTION_KIND_ABORT] = { 2178 .instance_size = sizeof(BlkActionState), 2179 .prepare = abort_prepare, 2180 .commit = abort_commit, 2181 }, 2182 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2183 .instance_size = sizeof(InternalSnapshotState), 2184 .prepare = internal_snapshot_prepare, 2185 .abort = internal_snapshot_abort, 2186 .clean = internal_snapshot_clean, 2187 }, 2188 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2189 .instance_size = sizeof(BlockDirtyBitmapState), 2190 .prepare = block_dirty_bitmap_add_prepare, 2191 .abort = block_dirty_bitmap_add_abort, 2192 }, 2193 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2194 .instance_size = sizeof(BlockDirtyBitmapState), 2195 .prepare = block_dirty_bitmap_clear_prepare, 2196 .commit = block_dirty_bitmap_free_backup, 2197 .abort = block_dirty_bitmap_restore, 2198 }, 2199 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2200 .instance_size = sizeof(BlockDirtyBitmapState), 2201 .prepare = block_dirty_bitmap_enable_prepare, 2202 .abort = block_dirty_bitmap_enable_abort, 2203 }, 2204 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2205 .instance_size = sizeof(BlockDirtyBitmapState), 2206 .prepare = block_dirty_bitmap_disable_prepare, 2207 .abort = block_dirty_bitmap_disable_abort, 2208 }, 2209 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2210 .instance_size = sizeof(BlockDirtyBitmapState), 2211 .prepare = block_dirty_bitmap_merge_prepare, 2212 .commit = block_dirty_bitmap_free_backup, 2213 .abort = block_dirty_bitmap_restore, 2214 }, 2215 /* Where are transactions for MIRROR, COMMIT and STREAM? 2216 * Although these blockjobs use transaction callbacks like the backup job, 2217 * these jobs do not necessarily adhere to transaction semantics. 2218 * These jobs may not fully undo all of their actions on abort, nor do they 2219 * necessarily work in transactions with more than one job in them. 2220 */ 2221 }; 2222 2223 /** 2224 * Allocate a TransactionProperties structure if necessary, and fill 2225 * that structure with desired defaults if they are unset. 2226 */ 2227 static TransactionProperties *get_transaction_properties( 2228 TransactionProperties *props) 2229 { 2230 if (!props) { 2231 props = g_new0(TransactionProperties, 1); 2232 } 2233 2234 if (!props->has_completion_mode) { 2235 props->has_completion_mode = true; 2236 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2237 } 2238 2239 return props; 2240 } 2241 2242 /* 2243 * 'Atomic' group operations. The operations are performed as a set, and if 2244 * any fail then we roll back all operations in the group. 2245 */ 2246 void qmp_transaction(TransactionActionList *dev_list, 2247 bool has_props, 2248 struct TransactionProperties *props, 2249 Error **errp) 2250 { 2251 TransactionActionList *dev_entry = dev_list; 2252 JobTxn *block_job_txn = NULL; 2253 BlkActionState *state, *next; 2254 Error *local_err = NULL; 2255 2256 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2257 QTAILQ_INIT(&snap_bdrv_states); 2258 2259 /* Does this transaction get canceled as a group on failure? 2260 * If not, we don't really need to make a JobTxn. 2261 */ 2262 props = get_transaction_properties(props); 2263 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2264 block_job_txn = job_txn_new(); 2265 } 2266 2267 /* drain all i/o before any operations */ 2268 bdrv_drain_all(); 2269 2270 /* We don't do anything in this loop that commits us to the operations */ 2271 while (NULL != dev_entry) { 2272 TransactionAction *dev_info = NULL; 2273 const BlkActionOps *ops; 2274 2275 dev_info = dev_entry->value; 2276 dev_entry = dev_entry->next; 2277 2278 assert(dev_info->type < ARRAY_SIZE(actions)); 2279 2280 ops = &actions[dev_info->type]; 2281 assert(ops->instance_size > 0); 2282 2283 state = g_malloc0(ops->instance_size); 2284 state->ops = ops; 2285 state->action = dev_info; 2286 state->block_job_txn = block_job_txn; 2287 state->txn_props = props; 2288 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2289 2290 state->ops->prepare(state, &local_err); 2291 if (local_err) { 2292 error_propagate(errp, local_err); 2293 goto delete_and_fail; 2294 } 2295 } 2296 2297 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2298 if (state->ops->commit) { 2299 state->ops->commit(state); 2300 } 2301 } 2302 2303 /* success */ 2304 goto exit; 2305 2306 delete_and_fail: 2307 /* failure, and it is all-or-none; roll back all operations */ 2308 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2309 if (state->ops->abort) { 2310 state->ops->abort(state); 2311 } 2312 } 2313 exit: 2314 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2315 if (state->ops->clean) { 2316 state->ops->clean(state); 2317 } 2318 g_free(state); 2319 } 2320 if (!has_props) { 2321 qapi_free_TransactionProperties(props); 2322 } 2323 job_txn_unref(block_job_txn); 2324 } 2325 2326 void qmp_eject(bool has_device, const char *device, 2327 bool has_id, const char *id, 2328 bool has_force, bool force, Error **errp) 2329 { 2330 Error *local_err = NULL; 2331 int rc; 2332 2333 if (!has_force) { 2334 force = false; 2335 } 2336 2337 rc = do_open_tray(has_device ? device : NULL, 2338 has_id ? id : NULL, 2339 force, &local_err); 2340 if (rc && rc != -ENOSYS) { 2341 error_propagate(errp, local_err); 2342 return; 2343 } 2344 error_free(local_err); 2345 2346 blockdev_remove_medium(has_device, device, has_id, id, errp); 2347 } 2348 2349 void qmp_block_passwd(bool has_device, const char *device, 2350 bool has_node_name, const char *node_name, 2351 const char *password, Error **errp) 2352 { 2353 error_setg(errp, 2354 "Setting block passwords directly is no longer supported"); 2355 } 2356 2357 /* 2358 * Attempt to open the tray of @device. 2359 * If @force, ignore its tray lock. 2360 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2361 * On error, store an error through @errp and return -errno. 2362 * If @device does not exist, return -ENODEV. 2363 * If it has no removable media, return -ENOTSUP. 2364 * If it has no tray, return -ENOSYS. 2365 * If the guest was asked to open the tray, return -EINPROGRESS. 2366 * Else, return 0. 2367 */ 2368 static int do_open_tray(const char *blk_name, const char *qdev_id, 2369 bool force, Error **errp) 2370 { 2371 BlockBackend *blk; 2372 const char *device = qdev_id ?: blk_name; 2373 bool locked; 2374 2375 blk = qmp_get_blk(blk_name, qdev_id, errp); 2376 if (!blk) { 2377 return -ENODEV; 2378 } 2379 2380 if (!blk_dev_has_removable_media(blk)) { 2381 error_setg(errp, "Device '%s' is not removable", device); 2382 return -ENOTSUP; 2383 } 2384 2385 if (!blk_dev_has_tray(blk)) { 2386 error_setg(errp, "Device '%s' does not have a tray", device); 2387 return -ENOSYS; 2388 } 2389 2390 if (blk_dev_is_tray_open(blk)) { 2391 return 0; 2392 } 2393 2394 locked = blk_dev_is_medium_locked(blk); 2395 if (locked) { 2396 blk_dev_eject_request(blk, force); 2397 } 2398 2399 if (!locked || force) { 2400 blk_dev_change_media_cb(blk, false, &error_abort); 2401 } 2402 2403 if (locked && !force) { 2404 error_setg(errp, "Device '%s' is locked and force was not specified, " 2405 "wait for tray to open and try again", device); 2406 return -EINPROGRESS; 2407 } 2408 2409 return 0; 2410 } 2411 2412 void qmp_blockdev_open_tray(bool has_device, const char *device, 2413 bool has_id, const char *id, 2414 bool has_force, bool force, 2415 Error **errp) 2416 { 2417 Error *local_err = NULL; 2418 int rc; 2419 2420 if (!has_force) { 2421 force = false; 2422 } 2423 rc = do_open_tray(has_device ? device : NULL, 2424 has_id ? id : NULL, 2425 force, &local_err); 2426 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2427 error_propagate(errp, local_err); 2428 return; 2429 } 2430 error_free(local_err); 2431 } 2432 2433 void qmp_blockdev_close_tray(bool has_device, const char *device, 2434 bool has_id, const char *id, 2435 Error **errp) 2436 { 2437 BlockBackend *blk; 2438 Error *local_err = NULL; 2439 2440 device = has_device ? device : NULL; 2441 id = has_id ? id : NULL; 2442 2443 blk = qmp_get_blk(device, id, errp); 2444 if (!blk) { 2445 return; 2446 } 2447 2448 if (!blk_dev_has_removable_media(blk)) { 2449 error_setg(errp, "Device '%s' is not removable", device ?: id); 2450 return; 2451 } 2452 2453 if (!blk_dev_has_tray(blk)) { 2454 /* Ignore this command on tray-less devices */ 2455 return; 2456 } 2457 2458 if (!blk_dev_is_tray_open(blk)) { 2459 return; 2460 } 2461 2462 blk_dev_change_media_cb(blk, true, &local_err); 2463 if (local_err) { 2464 error_propagate(errp, local_err); 2465 return; 2466 } 2467 } 2468 2469 static void blockdev_remove_medium(bool has_device, const char *device, 2470 bool has_id, const char *id, Error **errp) 2471 { 2472 BlockBackend *blk; 2473 BlockDriverState *bs; 2474 AioContext *aio_context; 2475 bool has_attached_device; 2476 2477 device = has_device ? device : NULL; 2478 id = has_id ? id : NULL; 2479 2480 blk = qmp_get_blk(device, id, errp); 2481 if (!blk) { 2482 return; 2483 } 2484 2485 /* For BBs without a device, we can exchange the BDS tree at will */ 2486 has_attached_device = blk_get_attached_dev(blk); 2487 2488 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2489 error_setg(errp, "Device '%s' is not removable", device ?: id); 2490 return; 2491 } 2492 2493 if (has_attached_device && blk_dev_has_tray(blk) && 2494 !blk_dev_is_tray_open(blk)) 2495 { 2496 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2497 return; 2498 } 2499 2500 bs = blk_bs(blk); 2501 if (!bs) { 2502 return; 2503 } 2504 2505 aio_context = bdrv_get_aio_context(bs); 2506 aio_context_acquire(aio_context); 2507 2508 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2509 goto out; 2510 } 2511 2512 blk_remove_bs(blk); 2513 2514 if (!blk_dev_has_tray(blk)) { 2515 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2516 * called at all); therefore, the medium needs to be ejected here. 2517 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2518 * value passed here (i.e. false). */ 2519 blk_dev_change_media_cb(blk, false, &error_abort); 2520 } 2521 2522 out: 2523 aio_context_release(aio_context); 2524 } 2525 2526 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2527 { 2528 blockdev_remove_medium(false, NULL, true, id, errp); 2529 } 2530 2531 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2532 BlockDriverState *bs, Error **errp) 2533 { 2534 Error *local_err = NULL; 2535 bool has_device; 2536 int ret; 2537 2538 /* For BBs without a device, we can exchange the BDS tree at will */ 2539 has_device = blk_get_attached_dev(blk); 2540 2541 if (has_device && !blk_dev_has_removable_media(blk)) { 2542 error_setg(errp, "Device is not removable"); 2543 return; 2544 } 2545 2546 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2547 error_setg(errp, "Tray of the device is not open"); 2548 return; 2549 } 2550 2551 if (blk_bs(blk)) { 2552 error_setg(errp, "There already is a medium in the device"); 2553 return; 2554 } 2555 2556 ret = blk_insert_bs(blk, bs, errp); 2557 if (ret < 0) { 2558 return; 2559 } 2560 2561 if (!blk_dev_has_tray(blk)) { 2562 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2563 * called at all); therefore, the medium needs to be pushed into the 2564 * slot here. 2565 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2566 * value passed here (i.e. true). */ 2567 blk_dev_change_media_cb(blk, true, &local_err); 2568 if (local_err) { 2569 error_propagate(errp, local_err); 2570 blk_remove_bs(blk); 2571 return; 2572 } 2573 } 2574 } 2575 2576 static void blockdev_insert_medium(bool has_device, const char *device, 2577 bool has_id, const char *id, 2578 const char *node_name, Error **errp) 2579 { 2580 BlockBackend *blk; 2581 BlockDriverState *bs; 2582 2583 blk = qmp_get_blk(has_device ? device : NULL, 2584 has_id ? id : NULL, 2585 errp); 2586 if (!blk) { 2587 return; 2588 } 2589 2590 bs = bdrv_find_node(node_name); 2591 if (!bs) { 2592 error_setg(errp, "Node '%s' not found", node_name); 2593 return; 2594 } 2595 2596 if (bdrv_has_blk(bs)) { 2597 error_setg(errp, "Node '%s' is already in use", node_name); 2598 return; 2599 } 2600 2601 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2602 } 2603 2604 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2605 Error **errp) 2606 { 2607 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2608 } 2609 2610 void qmp_blockdev_change_medium(bool has_device, const char *device, 2611 bool has_id, const char *id, 2612 const char *filename, 2613 bool has_format, const char *format, 2614 bool has_read_only, 2615 BlockdevChangeReadOnlyMode read_only, 2616 Error **errp) 2617 { 2618 BlockBackend *blk; 2619 BlockDriverState *medium_bs = NULL; 2620 int bdrv_flags; 2621 bool detect_zeroes; 2622 int rc; 2623 QDict *options = NULL; 2624 Error *err = NULL; 2625 2626 blk = qmp_get_blk(has_device ? device : NULL, 2627 has_id ? id : NULL, 2628 errp); 2629 if (!blk) { 2630 goto fail; 2631 } 2632 2633 if (blk_bs(blk)) { 2634 blk_update_root_state(blk); 2635 } 2636 2637 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2638 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2639 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2640 2641 if (!has_read_only) { 2642 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2643 } 2644 2645 switch (read_only) { 2646 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2647 break; 2648 2649 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2650 bdrv_flags &= ~BDRV_O_RDWR; 2651 break; 2652 2653 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2654 bdrv_flags |= BDRV_O_RDWR; 2655 break; 2656 2657 default: 2658 abort(); 2659 } 2660 2661 options = qdict_new(); 2662 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2663 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2664 2665 if (has_format) { 2666 qdict_put_str(options, "driver", format); 2667 } 2668 2669 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2670 if (!medium_bs) { 2671 goto fail; 2672 } 2673 2674 rc = do_open_tray(has_device ? device : NULL, 2675 has_id ? id : NULL, 2676 false, &err); 2677 if (rc && rc != -ENOSYS) { 2678 error_propagate(errp, err); 2679 goto fail; 2680 } 2681 error_free(err); 2682 err = NULL; 2683 2684 blockdev_remove_medium(has_device, device, has_id, id, &err); 2685 if (err) { 2686 error_propagate(errp, err); 2687 goto fail; 2688 } 2689 2690 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2691 if (err) { 2692 error_propagate(errp, err); 2693 goto fail; 2694 } 2695 2696 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2697 2698 fail: 2699 /* If the medium has been inserted, the device has its own reference, so 2700 * ours must be relinquished; and if it has not been inserted successfully, 2701 * the reference must be relinquished anyway */ 2702 bdrv_unref(medium_bs); 2703 } 2704 2705 /* throttling disk I/O limits */ 2706 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2707 { 2708 ThrottleConfig cfg; 2709 BlockDriverState *bs; 2710 BlockBackend *blk; 2711 AioContext *aio_context; 2712 2713 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2714 arg->has_id ? arg->id : NULL, 2715 errp); 2716 if (!blk) { 2717 return; 2718 } 2719 2720 aio_context = blk_get_aio_context(blk); 2721 aio_context_acquire(aio_context); 2722 2723 bs = blk_bs(blk); 2724 if (!bs) { 2725 error_setg(errp, "Device has no medium"); 2726 goto out; 2727 } 2728 2729 throttle_config_init(&cfg); 2730 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2731 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2732 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2733 2734 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2735 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2736 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2737 2738 if (arg->has_bps_max) { 2739 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2740 } 2741 if (arg->has_bps_rd_max) { 2742 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2743 } 2744 if (arg->has_bps_wr_max) { 2745 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2746 } 2747 if (arg->has_iops_max) { 2748 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2749 } 2750 if (arg->has_iops_rd_max) { 2751 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2752 } 2753 if (arg->has_iops_wr_max) { 2754 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2755 } 2756 2757 if (arg->has_bps_max_length) { 2758 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2759 } 2760 if (arg->has_bps_rd_max_length) { 2761 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2762 } 2763 if (arg->has_bps_wr_max_length) { 2764 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2765 } 2766 if (arg->has_iops_max_length) { 2767 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2768 } 2769 if (arg->has_iops_rd_max_length) { 2770 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2771 } 2772 if (arg->has_iops_wr_max_length) { 2773 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2774 } 2775 2776 if (arg->has_iops_size) { 2777 cfg.op_size = arg->iops_size; 2778 } 2779 2780 if (!throttle_is_valid(&cfg, errp)) { 2781 goto out; 2782 } 2783 2784 if (throttle_enabled(&cfg)) { 2785 /* Enable I/O limits if they're not enabled yet, otherwise 2786 * just update the throttling group. */ 2787 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2788 blk_io_limits_enable(blk, 2789 arg->has_group ? arg->group : 2790 arg->has_device ? arg->device : 2791 arg->id); 2792 } else if (arg->has_group) { 2793 blk_io_limits_update_group(blk, arg->group); 2794 } 2795 /* Set the new throttling configuration */ 2796 blk_set_io_limits(blk, &cfg); 2797 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2798 /* If all throttling settings are set to 0, disable I/O limits */ 2799 blk_io_limits_disable(blk); 2800 } 2801 2802 out: 2803 aio_context_release(aio_context); 2804 } 2805 2806 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2807 bool has_granularity, uint32_t granularity, 2808 bool has_persistent, bool persistent, 2809 bool has_autoload, bool autoload, 2810 bool has_disabled, bool disabled, 2811 Error **errp) 2812 { 2813 BlockDriverState *bs; 2814 BdrvDirtyBitmap *bitmap; 2815 AioContext *aio_context = NULL; 2816 2817 if (!name || name[0] == '\0') { 2818 error_setg(errp, "Bitmap name cannot be empty"); 2819 return; 2820 } 2821 2822 bs = bdrv_lookup_bs(node, node, errp); 2823 if (!bs) { 2824 return; 2825 } 2826 2827 if (has_granularity) { 2828 if (granularity < 512 || !is_power_of_2(granularity)) { 2829 error_setg(errp, "Granularity must be power of 2 " 2830 "and at least 512"); 2831 return; 2832 } 2833 } else { 2834 /* Default to cluster size, if available: */ 2835 granularity = bdrv_get_default_bitmap_granularity(bs); 2836 } 2837 2838 if (!has_persistent) { 2839 persistent = false; 2840 } 2841 2842 if (has_autoload) { 2843 warn_report("Autoload option is deprecated and its value is ignored"); 2844 } 2845 2846 if (!has_disabled) { 2847 disabled = false; 2848 } 2849 2850 if (persistent) { 2851 aio_context = bdrv_get_aio_context(bs); 2852 aio_context_acquire(aio_context); 2853 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2854 goto out; 2855 } 2856 } 2857 2858 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2859 if (bitmap == NULL) { 2860 goto out; 2861 } 2862 2863 if (disabled) { 2864 bdrv_disable_dirty_bitmap(bitmap); 2865 } 2866 2867 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2868 out: 2869 if (aio_context) { 2870 aio_context_release(aio_context); 2871 } 2872 } 2873 2874 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2875 Error **errp) 2876 { 2877 BlockDriverState *bs; 2878 BdrvDirtyBitmap *bitmap; 2879 Error *local_err = NULL; 2880 AioContext *aio_context = NULL; 2881 2882 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2883 if (!bitmap || !bs) { 2884 return; 2885 } 2886 2887 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2888 errp)) { 2889 return; 2890 } 2891 2892 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2893 aio_context = bdrv_get_aio_context(bs); 2894 aio_context_acquire(aio_context); 2895 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2896 if (local_err != NULL) { 2897 error_propagate(errp, local_err); 2898 goto out; 2899 } 2900 } 2901 2902 bdrv_release_dirty_bitmap(bs, bitmap); 2903 out: 2904 if (aio_context) { 2905 aio_context_release(aio_context); 2906 } 2907 } 2908 2909 /** 2910 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2911 * immediately after a full backup operation. 2912 */ 2913 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2914 Error **errp) 2915 { 2916 BdrvDirtyBitmap *bitmap; 2917 BlockDriverState *bs; 2918 2919 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2920 if (!bitmap || !bs) { 2921 return; 2922 } 2923 2924 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2925 return; 2926 } 2927 2928 bdrv_clear_dirty_bitmap(bitmap, NULL); 2929 } 2930 2931 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2932 Error **errp) 2933 { 2934 BlockDriverState *bs; 2935 BdrvDirtyBitmap *bitmap; 2936 2937 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2938 if (!bitmap) { 2939 return; 2940 } 2941 2942 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2943 return; 2944 } 2945 2946 bdrv_enable_dirty_bitmap(bitmap); 2947 } 2948 2949 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2950 Error **errp) 2951 { 2952 BlockDriverState *bs; 2953 BdrvDirtyBitmap *bitmap; 2954 2955 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2956 if (!bitmap) { 2957 return; 2958 } 2959 2960 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2961 return; 2962 } 2963 2964 bdrv_disable_dirty_bitmap(bitmap); 2965 } 2966 2967 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2968 const char *node, const char *target, 2969 BlockDirtyBitmapMergeSourceList *bitmaps, 2970 HBitmap **backup, Error **errp) 2971 { 2972 BlockDriverState *bs; 2973 BdrvDirtyBitmap *dst, *src, *anon; 2974 BlockDirtyBitmapMergeSourceList *lst; 2975 Error *local_err = NULL; 2976 2977 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 2978 if (!dst) { 2979 return NULL; 2980 } 2981 2982 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 2983 NULL, errp); 2984 if (!anon) { 2985 return NULL; 2986 } 2987 2988 for (lst = bitmaps; lst; lst = lst->next) { 2989 switch (lst->value->type) { 2990 const char *name, *node; 2991 case QTYPE_QSTRING: 2992 name = lst->value->u.local; 2993 src = bdrv_find_dirty_bitmap(bs, name); 2994 if (!src) { 2995 error_setg(errp, "Dirty bitmap '%s' not found", name); 2996 dst = NULL; 2997 goto out; 2998 } 2999 break; 3000 case QTYPE_QDICT: 3001 node = lst->value->u.external.node; 3002 name = lst->value->u.external.name; 3003 src = block_dirty_bitmap_lookup(node, name, NULL, errp); 3004 if (!src) { 3005 dst = NULL; 3006 goto out; 3007 } 3008 break; 3009 default: 3010 abort(); 3011 } 3012 3013 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 3014 if (local_err) { 3015 error_propagate(errp, local_err); 3016 dst = NULL; 3017 goto out; 3018 } 3019 } 3020 3021 /* Merge into dst; dst is unchanged on failure. */ 3022 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3023 3024 out: 3025 bdrv_release_dirty_bitmap(bs, anon); 3026 return dst; 3027 } 3028 3029 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3030 BlockDirtyBitmapMergeSourceList *bitmaps, 3031 Error **errp) 3032 { 3033 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3034 } 3035 3036 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3037 const char *name, 3038 Error **errp) 3039 { 3040 BdrvDirtyBitmap *bitmap; 3041 BlockDriverState *bs; 3042 BlockDirtyBitmapSha256 *ret = NULL; 3043 char *sha256; 3044 3045 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3046 if (!bitmap || !bs) { 3047 return NULL; 3048 } 3049 3050 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3051 if (sha256 == NULL) { 3052 return NULL; 3053 } 3054 3055 ret = g_new(BlockDirtyBitmapSha256, 1); 3056 ret->sha256 = sha256; 3057 3058 return ret; 3059 } 3060 3061 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3062 { 3063 const char *id = qdict_get_str(qdict, "id"); 3064 BlockBackend *blk; 3065 BlockDriverState *bs; 3066 AioContext *aio_context; 3067 Error *local_err = NULL; 3068 3069 bs = bdrv_find_node(id); 3070 if (bs) { 3071 qmp_blockdev_del(id, &local_err); 3072 if (local_err) { 3073 error_report_err(local_err); 3074 } 3075 return; 3076 } 3077 3078 blk = blk_by_name(id); 3079 if (!blk) { 3080 error_report("Device '%s' not found", id); 3081 return; 3082 } 3083 3084 if (!blk_legacy_dinfo(blk)) { 3085 error_report("Deleting device added with blockdev-add" 3086 " is not supported"); 3087 return; 3088 } 3089 3090 aio_context = blk_get_aio_context(blk); 3091 aio_context_acquire(aio_context); 3092 3093 bs = blk_bs(blk); 3094 if (bs) { 3095 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3096 error_report_err(local_err); 3097 aio_context_release(aio_context); 3098 return; 3099 } 3100 3101 blk_remove_bs(blk); 3102 } 3103 3104 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3105 monitor_remove_blk(blk); 3106 3107 /* If this BlockBackend has a device attached to it, its refcount will be 3108 * decremented when the device is removed; otherwise we have to do so here. 3109 */ 3110 if (blk_get_attached_dev(blk)) { 3111 /* Further I/O must not pause the guest */ 3112 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3113 BLOCKDEV_ON_ERROR_REPORT); 3114 } else { 3115 blk_unref(blk); 3116 } 3117 3118 aio_context_release(aio_context); 3119 } 3120 3121 void qmp_block_resize(bool has_device, const char *device, 3122 bool has_node_name, const char *node_name, 3123 int64_t size, Error **errp) 3124 { 3125 Error *local_err = NULL; 3126 BlockBackend *blk = NULL; 3127 BlockDriverState *bs; 3128 AioContext *aio_context; 3129 int ret; 3130 3131 bs = bdrv_lookup_bs(has_device ? device : NULL, 3132 has_node_name ? node_name : NULL, 3133 &local_err); 3134 if (local_err) { 3135 error_propagate(errp, local_err); 3136 return; 3137 } 3138 3139 aio_context = bdrv_get_aio_context(bs); 3140 aio_context_acquire(aio_context); 3141 3142 if (!bdrv_is_first_non_filter(bs)) { 3143 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3144 goto out; 3145 } 3146 3147 if (size < 0) { 3148 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3149 goto out; 3150 } 3151 3152 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3153 error_setg(errp, QERR_DEVICE_IN_USE, device); 3154 goto out; 3155 } 3156 3157 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL); 3158 ret = blk_insert_bs(blk, bs, errp); 3159 if (ret < 0) { 3160 goto out; 3161 } 3162 3163 bdrv_drained_begin(bs); 3164 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3165 bdrv_drained_end(bs); 3166 3167 out: 3168 blk_unref(blk); 3169 aio_context_release(aio_context); 3170 } 3171 3172 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3173 bool has_base, const char *base, 3174 bool has_base_node, const char *base_node, 3175 bool has_backing_file, const char *backing_file, 3176 bool has_speed, int64_t speed, 3177 bool has_on_error, BlockdevOnError on_error, 3178 bool has_auto_finalize, bool auto_finalize, 3179 bool has_auto_dismiss, bool auto_dismiss, 3180 Error **errp) 3181 { 3182 BlockDriverState *bs, *iter; 3183 BlockDriverState *base_bs = NULL; 3184 AioContext *aio_context; 3185 Error *local_err = NULL; 3186 const char *base_name = NULL; 3187 int job_flags = JOB_DEFAULT; 3188 3189 if (!has_on_error) { 3190 on_error = BLOCKDEV_ON_ERROR_REPORT; 3191 } 3192 3193 bs = bdrv_lookup_bs(device, device, errp); 3194 if (!bs) { 3195 return; 3196 } 3197 3198 aio_context = bdrv_get_aio_context(bs); 3199 aio_context_acquire(aio_context); 3200 3201 if (has_base && has_base_node) { 3202 error_setg(errp, "'base' and 'base-node' cannot be specified " 3203 "at the same time"); 3204 goto out; 3205 } 3206 3207 if (has_base) { 3208 base_bs = bdrv_find_backing_image(bs, base); 3209 if (base_bs == NULL) { 3210 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3211 goto out; 3212 } 3213 assert(bdrv_get_aio_context(base_bs) == aio_context); 3214 base_name = base; 3215 } 3216 3217 if (has_base_node) { 3218 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3219 if (!base_bs) { 3220 goto out; 3221 } 3222 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3223 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3224 base_node, device); 3225 goto out; 3226 } 3227 assert(bdrv_get_aio_context(base_bs) == aio_context); 3228 bdrv_refresh_filename(base_bs); 3229 base_name = base_bs->filename; 3230 } 3231 3232 /* Check for op blockers in the whole chain between bs and base */ 3233 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3234 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3235 goto out; 3236 } 3237 } 3238 3239 /* if we are streaming the entire chain, the result will have no backing 3240 * file, and specifying one is therefore an error */ 3241 if (base_bs == NULL && has_backing_file) { 3242 error_setg(errp, "backing file specified, but streaming the " 3243 "entire chain"); 3244 goto out; 3245 } 3246 3247 /* backing_file string overrides base bs filename */ 3248 base_name = has_backing_file ? backing_file : base_name; 3249 3250 if (has_auto_finalize && !auto_finalize) { 3251 job_flags |= JOB_MANUAL_FINALIZE; 3252 } 3253 if (has_auto_dismiss && !auto_dismiss) { 3254 job_flags |= JOB_MANUAL_DISMISS; 3255 } 3256 3257 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3258 job_flags, has_speed ? speed : 0, on_error, &local_err); 3259 if (local_err) { 3260 error_propagate(errp, local_err); 3261 goto out; 3262 } 3263 3264 trace_qmp_block_stream(bs); 3265 3266 out: 3267 aio_context_release(aio_context); 3268 } 3269 3270 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3271 bool has_base_node, const char *base_node, 3272 bool has_base, const char *base, 3273 bool has_top_node, const char *top_node, 3274 bool has_top, const char *top, 3275 bool has_backing_file, const char *backing_file, 3276 bool has_speed, int64_t speed, 3277 bool has_filter_node_name, const char *filter_node_name, 3278 bool has_auto_finalize, bool auto_finalize, 3279 bool has_auto_dismiss, bool auto_dismiss, 3280 Error **errp) 3281 { 3282 BlockDriverState *bs; 3283 BlockDriverState *iter; 3284 BlockDriverState *base_bs, *top_bs; 3285 AioContext *aio_context; 3286 Error *local_err = NULL; 3287 /* This will be part of the QMP command, if/when the 3288 * BlockdevOnError change for blkmirror makes it in 3289 */ 3290 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3291 int job_flags = JOB_DEFAULT; 3292 3293 if (!has_speed) { 3294 speed = 0; 3295 } 3296 if (!has_filter_node_name) { 3297 filter_node_name = NULL; 3298 } 3299 if (has_auto_finalize && !auto_finalize) { 3300 job_flags |= JOB_MANUAL_FINALIZE; 3301 } 3302 if (has_auto_dismiss && !auto_dismiss) { 3303 job_flags |= JOB_MANUAL_DISMISS; 3304 } 3305 3306 /* Important Note: 3307 * libvirt relies on the DeviceNotFound error class in order to probe for 3308 * live commit feature versions; for this to work, we must make sure to 3309 * perform the device lookup before any generic errors that may occur in a 3310 * scenario in which all optional arguments are omitted. */ 3311 bs = qmp_get_root_bs(device, &local_err); 3312 if (!bs) { 3313 bs = bdrv_lookup_bs(device, device, NULL); 3314 if (!bs) { 3315 error_free(local_err); 3316 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3317 "Device '%s' not found", device); 3318 } else { 3319 error_propagate(errp, local_err); 3320 } 3321 return; 3322 } 3323 3324 aio_context = bdrv_get_aio_context(bs); 3325 aio_context_acquire(aio_context); 3326 3327 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3328 goto out; 3329 } 3330 3331 /* default top_bs is the active layer */ 3332 top_bs = bs; 3333 3334 if (has_top_node && has_top) { 3335 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3336 goto out; 3337 } else if (has_top_node) { 3338 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3339 if (top_bs == NULL) { 3340 goto out; 3341 } 3342 if (!bdrv_chain_contains(bs, top_bs)) { 3343 error_setg(errp, "'%s' is not in this backing file chain", 3344 top_node); 3345 goto out; 3346 } 3347 } else if (has_top && top) { 3348 /* This strcmp() is just a shortcut, there is no need to 3349 * refresh @bs's filename. If it mismatches, 3350 * bdrv_find_backing_image() will do the refresh and may still 3351 * return @bs. */ 3352 if (strcmp(bs->filename, top) != 0) { 3353 top_bs = bdrv_find_backing_image(bs, top); 3354 } 3355 } 3356 3357 if (top_bs == NULL) { 3358 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3359 goto out; 3360 } 3361 3362 assert(bdrv_get_aio_context(top_bs) == aio_context); 3363 3364 if (has_base_node && has_base) { 3365 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3366 goto out; 3367 } else if (has_base_node) { 3368 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3369 if (base_bs == NULL) { 3370 goto out; 3371 } 3372 if (!bdrv_chain_contains(top_bs, base_bs)) { 3373 error_setg(errp, "'%s' is not in this backing file chain", 3374 base_node); 3375 goto out; 3376 } 3377 } else if (has_base && base) { 3378 base_bs = bdrv_find_backing_image(top_bs, base); 3379 } else { 3380 base_bs = bdrv_find_base(top_bs); 3381 } 3382 3383 if (base_bs == NULL) { 3384 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3385 goto out; 3386 } 3387 3388 assert(bdrv_get_aio_context(base_bs) == aio_context); 3389 3390 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3391 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3392 goto out; 3393 } 3394 } 3395 3396 /* Do not allow attempts to commit an image into itself */ 3397 if (top_bs == base_bs) { 3398 error_setg(errp, "cannot commit an image into itself"); 3399 goto out; 3400 } 3401 3402 if (top_bs == bs) { 3403 if (has_backing_file) { 3404 error_setg(errp, "'backing-file' specified," 3405 " but 'top' is the active layer"); 3406 goto out; 3407 } 3408 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3409 job_flags, speed, on_error, 3410 filter_node_name, NULL, NULL, false, &local_err); 3411 } else { 3412 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3413 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3414 goto out; 3415 } 3416 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3417 speed, on_error, has_backing_file ? backing_file : NULL, 3418 filter_node_name, &local_err); 3419 } 3420 if (local_err != NULL) { 3421 error_propagate(errp, local_err); 3422 goto out; 3423 } 3424 3425 out: 3426 aio_context_release(aio_context); 3427 } 3428 3429 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3430 Error **errp) 3431 { 3432 BlockDriverState *bs; 3433 BlockDriverState *target_bs; 3434 BlockDriverState *source = NULL; 3435 BlockJob *job = NULL; 3436 BdrvDirtyBitmap *bmap = NULL; 3437 AioContext *aio_context; 3438 QDict *options = NULL; 3439 Error *local_err = NULL; 3440 int flags, job_flags = JOB_DEFAULT; 3441 int64_t size; 3442 bool set_backing_hd = false; 3443 int ret; 3444 3445 if (!backup->has_speed) { 3446 backup->speed = 0; 3447 } 3448 if (!backup->has_on_source_error) { 3449 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3450 } 3451 if (!backup->has_on_target_error) { 3452 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3453 } 3454 if (!backup->has_mode) { 3455 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3456 } 3457 if (!backup->has_job_id) { 3458 backup->job_id = NULL; 3459 } 3460 if (!backup->has_auto_finalize) { 3461 backup->auto_finalize = true; 3462 } 3463 if (!backup->has_auto_dismiss) { 3464 backup->auto_dismiss = true; 3465 } 3466 if (!backup->has_compress) { 3467 backup->compress = false; 3468 } 3469 3470 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3471 if (!bs) { 3472 return NULL; 3473 } 3474 3475 if (!bs->drv) { 3476 error_setg(errp, "Device has no medium"); 3477 return NULL; 3478 } 3479 3480 aio_context = bdrv_get_aio_context(bs); 3481 aio_context_acquire(aio_context); 3482 3483 if (!backup->has_format) { 3484 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3485 NULL : (char*) bs->drv->format_name; 3486 } 3487 3488 /* Early check to avoid creating target */ 3489 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3490 goto out; 3491 } 3492 3493 flags = bs->open_flags | BDRV_O_RDWR; 3494 3495 /* See if we have a backing HD we can use to create our new image 3496 * on top of. */ 3497 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3498 source = backing_bs(bs); 3499 if (!source) { 3500 backup->sync = MIRROR_SYNC_MODE_FULL; 3501 } 3502 } 3503 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3504 source = bs; 3505 flags |= BDRV_O_NO_BACKING; 3506 set_backing_hd = true; 3507 } 3508 3509 size = bdrv_getlength(bs); 3510 if (size < 0) { 3511 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3512 goto out; 3513 } 3514 3515 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3516 assert(backup->format); 3517 if (source) { 3518 bdrv_refresh_filename(source); 3519 bdrv_img_create(backup->target, backup->format, source->filename, 3520 source->drv->format_name, NULL, 3521 size, flags, false, &local_err); 3522 } else { 3523 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3524 size, flags, false, &local_err); 3525 } 3526 } 3527 3528 if (local_err) { 3529 error_propagate(errp, local_err); 3530 goto out; 3531 } 3532 3533 if (backup->format) { 3534 if (!options) { 3535 options = qdict_new(); 3536 } 3537 qdict_put_str(options, "driver", backup->format); 3538 } 3539 3540 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3541 if (!target_bs) { 3542 goto out; 3543 } 3544 3545 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3546 if (ret < 0) { 3547 bdrv_unref(target_bs); 3548 goto out; 3549 } 3550 3551 if (set_backing_hd) { 3552 bdrv_set_backing_hd(target_bs, source, &local_err); 3553 if (local_err) { 3554 goto unref; 3555 } 3556 } 3557 3558 if (backup->has_bitmap) { 3559 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3560 if (!bmap) { 3561 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3562 goto unref; 3563 } 3564 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3565 goto unref; 3566 } 3567 } 3568 if (!backup->auto_finalize) { 3569 job_flags |= JOB_MANUAL_FINALIZE; 3570 } 3571 if (!backup->auto_dismiss) { 3572 job_flags |= JOB_MANUAL_DISMISS; 3573 } 3574 3575 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3576 backup->sync, bmap, backup->compress, 3577 backup->on_source_error, backup->on_target_error, 3578 job_flags, NULL, NULL, txn, &local_err); 3579 if (local_err != NULL) { 3580 error_propagate(errp, local_err); 3581 goto unref; 3582 } 3583 3584 unref: 3585 bdrv_unref(target_bs); 3586 out: 3587 aio_context_release(aio_context); 3588 return job; 3589 } 3590 3591 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3592 { 3593 3594 BlockJob *job; 3595 job = do_drive_backup(arg, NULL, errp); 3596 if (job) { 3597 job_start(&job->job); 3598 } 3599 } 3600 3601 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3602 { 3603 return bdrv_named_nodes_list(errp); 3604 } 3605 3606 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3607 { 3608 return bdrv_get_xdbg_block_graph(errp); 3609 } 3610 3611 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3612 Error **errp) 3613 { 3614 BlockDriverState *bs; 3615 BlockDriverState *target_bs; 3616 Error *local_err = NULL; 3617 BdrvDirtyBitmap *bmap = NULL; 3618 AioContext *aio_context; 3619 BlockJob *job = NULL; 3620 int job_flags = JOB_DEFAULT; 3621 int ret; 3622 3623 if (!backup->has_speed) { 3624 backup->speed = 0; 3625 } 3626 if (!backup->has_on_source_error) { 3627 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3628 } 3629 if (!backup->has_on_target_error) { 3630 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3631 } 3632 if (!backup->has_job_id) { 3633 backup->job_id = NULL; 3634 } 3635 if (!backup->has_auto_finalize) { 3636 backup->auto_finalize = true; 3637 } 3638 if (!backup->has_auto_dismiss) { 3639 backup->auto_dismiss = true; 3640 } 3641 if (!backup->has_compress) { 3642 backup->compress = false; 3643 } 3644 3645 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3646 if (!bs) { 3647 return NULL; 3648 } 3649 3650 aio_context = bdrv_get_aio_context(bs); 3651 aio_context_acquire(aio_context); 3652 3653 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3654 if (!target_bs) { 3655 goto out; 3656 } 3657 3658 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3659 if (ret < 0) { 3660 goto out; 3661 } 3662 3663 if (backup->has_bitmap) { 3664 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3665 if (!bmap) { 3666 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3667 goto out; 3668 } 3669 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3670 goto out; 3671 } 3672 } 3673 3674 if (!backup->auto_finalize) { 3675 job_flags |= JOB_MANUAL_FINALIZE; 3676 } 3677 if (!backup->auto_dismiss) { 3678 job_flags |= JOB_MANUAL_DISMISS; 3679 } 3680 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3681 backup->sync, bmap, backup->compress, 3682 backup->on_source_error, backup->on_target_error, 3683 job_flags, NULL, NULL, txn, &local_err); 3684 if (local_err != NULL) { 3685 error_propagate(errp, local_err); 3686 } 3687 out: 3688 aio_context_release(aio_context); 3689 return job; 3690 } 3691 3692 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3693 { 3694 BlockJob *job; 3695 job = do_blockdev_backup(arg, NULL, errp); 3696 if (job) { 3697 job_start(&job->job); 3698 } 3699 } 3700 3701 /* Parameter check and block job starting for drive mirroring. 3702 * Caller should hold @device and @target's aio context (must be the same). 3703 **/ 3704 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3705 BlockDriverState *target, 3706 bool has_replaces, const char *replaces, 3707 enum MirrorSyncMode sync, 3708 BlockMirrorBackingMode backing_mode, 3709 bool has_speed, int64_t speed, 3710 bool has_granularity, uint32_t granularity, 3711 bool has_buf_size, int64_t buf_size, 3712 bool has_on_source_error, 3713 BlockdevOnError on_source_error, 3714 bool has_on_target_error, 3715 BlockdevOnError on_target_error, 3716 bool has_unmap, bool unmap, 3717 bool has_filter_node_name, 3718 const char *filter_node_name, 3719 bool has_copy_mode, MirrorCopyMode copy_mode, 3720 bool has_auto_finalize, bool auto_finalize, 3721 bool has_auto_dismiss, bool auto_dismiss, 3722 Error **errp) 3723 { 3724 int job_flags = JOB_DEFAULT; 3725 3726 if (!has_speed) { 3727 speed = 0; 3728 } 3729 if (!has_on_source_error) { 3730 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3731 } 3732 if (!has_on_target_error) { 3733 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3734 } 3735 if (!has_granularity) { 3736 granularity = 0; 3737 } 3738 if (!has_buf_size) { 3739 buf_size = 0; 3740 } 3741 if (!has_unmap) { 3742 unmap = true; 3743 } 3744 if (!has_filter_node_name) { 3745 filter_node_name = NULL; 3746 } 3747 if (!has_copy_mode) { 3748 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3749 } 3750 if (has_auto_finalize && !auto_finalize) { 3751 job_flags |= JOB_MANUAL_FINALIZE; 3752 } 3753 if (has_auto_dismiss && !auto_dismiss) { 3754 job_flags |= JOB_MANUAL_DISMISS; 3755 } 3756 3757 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3758 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3759 "a value in range [512B, 64MB]"); 3760 return; 3761 } 3762 if (granularity & (granularity - 1)) { 3763 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3764 "power of 2"); 3765 return; 3766 } 3767 3768 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3769 return; 3770 } 3771 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3772 return; 3773 } 3774 3775 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3776 sync = MIRROR_SYNC_MODE_FULL; 3777 } 3778 3779 if (has_replaces) { 3780 BlockDriverState *to_replace_bs; 3781 AioContext *replace_aio_context; 3782 int64_t bs_size, replace_size; 3783 3784 bs_size = bdrv_getlength(bs); 3785 if (bs_size < 0) { 3786 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3787 return; 3788 } 3789 3790 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3791 if (!to_replace_bs) { 3792 return; 3793 } 3794 3795 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3796 aio_context_acquire(replace_aio_context); 3797 replace_size = bdrv_getlength(to_replace_bs); 3798 aio_context_release(replace_aio_context); 3799 3800 if (replace_size < 0) { 3801 error_setg_errno(errp, -replace_size, 3802 "Failed to query the replacement node's size"); 3803 return; 3804 } 3805 if (bs_size != replace_size) { 3806 error_setg(errp, "cannot replace image with a mirror image of " 3807 "different size"); 3808 return; 3809 } 3810 } 3811 3812 /* pass the node name to replace to mirror start since it's loose coupling 3813 * and will allow to check whether the node still exist at mirror completion 3814 */ 3815 mirror_start(job_id, bs, target, 3816 has_replaces ? replaces : NULL, job_flags, 3817 speed, granularity, buf_size, sync, backing_mode, 3818 on_source_error, on_target_error, unmap, filter_node_name, 3819 copy_mode, errp); 3820 } 3821 3822 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3823 { 3824 BlockDriverState *bs; 3825 BlockDriverState *source, *target_bs; 3826 AioContext *aio_context; 3827 BlockMirrorBackingMode backing_mode; 3828 Error *local_err = NULL; 3829 QDict *options = NULL; 3830 int flags; 3831 int64_t size; 3832 const char *format = arg->format; 3833 int ret; 3834 3835 bs = qmp_get_root_bs(arg->device, errp); 3836 if (!bs) { 3837 return; 3838 } 3839 3840 /* Early check to avoid creating target */ 3841 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3842 return; 3843 } 3844 3845 aio_context = bdrv_get_aio_context(bs); 3846 aio_context_acquire(aio_context); 3847 3848 if (!arg->has_mode) { 3849 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3850 } 3851 3852 if (!arg->has_format) { 3853 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3854 ? NULL : bs->drv->format_name); 3855 } 3856 3857 flags = bs->open_flags | BDRV_O_RDWR; 3858 source = backing_bs(bs); 3859 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3860 arg->sync = MIRROR_SYNC_MODE_FULL; 3861 } 3862 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3863 source = bs; 3864 } 3865 3866 size = bdrv_getlength(bs); 3867 if (size < 0) { 3868 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3869 goto out; 3870 } 3871 3872 if (arg->has_replaces) { 3873 if (!arg->has_node_name) { 3874 error_setg(errp, "a node-name must be provided when replacing a" 3875 " named node of the graph"); 3876 goto out; 3877 } 3878 } 3879 3880 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3881 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3882 } else { 3883 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3884 } 3885 3886 /* Don't open backing image in create() */ 3887 flags |= BDRV_O_NO_BACKING; 3888 3889 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3890 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3891 { 3892 /* create new image w/o backing file */ 3893 assert(format); 3894 bdrv_img_create(arg->target, format, 3895 NULL, NULL, NULL, size, flags, false, &local_err); 3896 } else { 3897 switch (arg->mode) { 3898 case NEW_IMAGE_MODE_EXISTING: 3899 break; 3900 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3901 /* create new image with backing file */ 3902 bdrv_refresh_filename(source); 3903 bdrv_img_create(arg->target, format, 3904 source->filename, 3905 source->drv->format_name, 3906 NULL, size, flags, false, &local_err); 3907 break; 3908 default: 3909 abort(); 3910 } 3911 } 3912 3913 if (local_err) { 3914 error_propagate(errp, local_err); 3915 goto out; 3916 } 3917 3918 options = qdict_new(); 3919 if (arg->has_node_name) { 3920 qdict_put_str(options, "node-name", arg->node_name); 3921 } 3922 if (format) { 3923 qdict_put_str(options, "driver", format); 3924 } 3925 3926 /* Mirroring takes care of copy-on-write using the source's backing 3927 * file. 3928 */ 3929 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3930 if (!target_bs) { 3931 goto out; 3932 } 3933 3934 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3935 if (ret < 0) { 3936 bdrv_unref(target_bs); 3937 goto out; 3938 } 3939 3940 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3941 arg->has_replaces, arg->replaces, arg->sync, 3942 backing_mode, arg->has_speed, arg->speed, 3943 arg->has_granularity, arg->granularity, 3944 arg->has_buf_size, arg->buf_size, 3945 arg->has_on_source_error, arg->on_source_error, 3946 arg->has_on_target_error, arg->on_target_error, 3947 arg->has_unmap, arg->unmap, 3948 false, NULL, 3949 arg->has_copy_mode, arg->copy_mode, 3950 arg->has_auto_finalize, arg->auto_finalize, 3951 arg->has_auto_dismiss, arg->auto_dismiss, 3952 &local_err); 3953 bdrv_unref(target_bs); 3954 error_propagate(errp, local_err); 3955 out: 3956 aio_context_release(aio_context); 3957 } 3958 3959 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3960 const char *device, const char *target, 3961 bool has_replaces, const char *replaces, 3962 MirrorSyncMode sync, 3963 bool has_speed, int64_t speed, 3964 bool has_granularity, uint32_t granularity, 3965 bool has_buf_size, int64_t buf_size, 3966 bool has_on_source_error, 3967 BlockdevOnError on_source_error, 3968 bool has_on_target_error, 3969 BlockdevOnError on_target_error, 3970 bool has_filter_node_name, 3971 const char *filter_node_name, 3972 bool has_copy_mode, MirrorCopyMode copy_mode, 3973 bool has_auto_finalize, bool auto_finalize, 3974 bool has_auto_dismiss, bool auto_dismiss, 3975 Error **errp) 3976 { 3977 BlockDriverState *bs; 3978 BlockDriverState *target_bs; 3979 AioContext *aio_context; 3980 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3981 Error *local_err = NULL; 3982 int ret; 3983 3984 bs = qmp_get_root_bs(device, errp); 3985 if (!bs) { 3986 return; 3987 } 3988 3989 target_bs = bdrv_lookup_bs(target, target, errp); 3990 if (!target_bs) { 3991 return; 3992 } 3993 3994 aio_context = bdrv_get_aio_context(bs); 3995 aio_context_acquire(aio_context); 3996 3997 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3998 if (ret < 0) { 3999 goto out; 4000 } 4001 4002 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 4003 has_replaces, replaces, sync, backing_mode, 4004 has_speed, speed, 4005 has_granularity, granularity, 4006 has_buf_size, buf_size, 4007 has_on_source_error, on_source_error, 4008 has_on_target_error, on_target_error, 4009 true, true, 4010 has_filter_node_name, filter_node_name, 4011 has_copy_mode, copy_mode, 4012 has_auto_finalize, auto_finalize, 4013 has_auto_dismiss, auto_dismiss, 4014 &local_err); 4015 error_propagate(errp, local_err); 4016 out: 4017 aio_context_release(aio_context); 4018 } 4019 4020 /* Get a block job using its ID and acquire its AioContext */ 4021 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 4022 Error **errp) 4023 { 4024 BlockJob *job; 4025 4026 assert(id != NULL); 4027 4028 *aio_context = NULL; 4029 4030 job = block_job_get(id); 4031 4032 if (!job) { 4033 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4034 "Block job '%s' not found", id); 4035 return NULL; 4036 } 4037 4038 *aio_context = blk_get_aio_context(job->blk); 4039 aio_context_acquire(*aio_context); 4040 4041 return job; 4042 } 4043 4044 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4045 { 4046 AioContext *aio_context; 4047 BlockJob *job = find_block_job(device, &aio_context, errp); 4048 4049 if (!job) { 4050 return; 4051 } 4052 4053 block_job_set_speed(job, speed, errp); 4054 aio_context_release(aio_context); 4055 } 4056 4057 void qmp_block_job_cancel(const char *device, 4058 bool has_force, bool force, Error **errp) 4059 { 4060 AioContext *aio_context; 4061 BlockJob *job = find_block_job(device, &aio_context, errp); 4062 4063 if (!job) { 4064 return; 4065 } 4066 4067 if (!has_force) { 4068 force = false; 4069 } 4070 4071 if (job_user_paused(&job->job) && !force) { 4072 error_setg(errp, "The block job for device '%s' is currently paused", 4073 device); 4074 goto out; 4075 } 4076 4077 trace_qmp_block_job_cancel(job); 4078 job_user_cancel(&job->job, force, errp); 4079 out: 4080 aio_context_release(aio_context); 4081 } 4082 4083 void qmp_block_job_pause(const char *device, Error **errp) 4084 { 4085 AioContext *aio_context; 4086 BlockJob *job = find_block_job(device, &aio_context, errp); 4087 4088 if (!job) { 4089 return; 4090 } 4091 4092 trace_qmp_block_job_pause(job); 4093 job_user_pause(&job->job, errp); 4094 aio_context_release(aio_context); 4095 } 4096 4097 void qmp_block_job_resume(const char *device, Error **errp) 4098 { 4099 AioContext *aio_context; 4100 BlockJob *job = find_block_job(device, &aio_context, errp); 4101 4102 if (!job) { 4103 return; 4104 } 4105 4106 trace_qmp_block_job_resume(job); 4107 job_user_resume(&job->job, errp); 4108 aio_context_release(aio_context); 4109 } 4110 4111 void qmp_block_job_complete(const char *device, Error **errp) 4112 { 4113 AioContext *aio_context; 4114 BlockJob *job = find_block_job(device, &aio_context, errp); 4115 4116 if (!job) { 4117 return; 4118 } 4119 4120 trace_qmp_block_job_complete(job); 4121 job_complete(&job->job, errp); 4122 aio_context_release(aio_context); 4123 } 4124 4125 void qmp_block_job_finalize(const char *id, Error **errp) 4126 { 4127 AioContext *aio_context; 4128 BlockJob *job = find_block_job(id, &aio_context, errp); 4129 4130 if (!job) { 4131 return; 4132 } 4133 4134 trace_qmp_block_job_finalize(job); 4135 job_finalize(&job->job, errp); 4136 aio_context_release(aio_context); 4137 } 4138 4139 void qmp_block_job_dismiss(const char *id, Error **errp) 4140 { 4141 AioContext *aio_context; 4142 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4143 Job *job; 4144 4145 if (!bjob) { 4146 return; 4147 } 4148 4149 trace_qmp_block_job_dismiss(bjob); 4150 job = &bjob->job; 4151 job_dismiss(&job, errp); 4152 aio_context_release(aio_context); 4153 } 4154 4155 void qmp_change_backing_file(const char *device, 4156 const char *image_node_name, 4157 const char *backing_file, 4158 Error **errp) 4159 { 4160 BlockDriverState *bs = NULL; 4161 AioContext *aio_context; 4162 BlockDriverState *image_bs = NULL; 4163 Error *local_err = NULL; 4164 bool ro; 4165 int ret; 4166 4167 bs = qmp_get_root_bs(device, errp); 4168 if (!bs) { 4169 return; 4170 } 4171 4172 aio_context = bdrv_get_aio_context(bs); 4173 aio_context_acquire(aio_context); 4174 4175 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4176 if (local_err) { 4177 error_propagate(errp, local_err); 4178 goto out; 4179 } 4180 4181 if (!image_bs) { 4182 error_setg(errp, "image file not found"); 4183 goto out; 4184 } 4185 4186 if (bdrv_find_base(image_bs) == image_bs) { 4187 error_setg(errp, "not allowing backing file change on an image " 4188 "without a backing file"); 4189 goto out; 4190 } 4191 4192 /* even though we are not necessarily operating on bs, we need it to 4193 * determine if block ops are currently prohibited on the chain */ 4194 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4195 goto out; 4196 } 4197 4198 /* final sanity check */ 4199 if (!bdrv_chain_contains(bs, image_bs)) { 4200 error_setg(errp, "'%s' and image file are not in the same chain", 4201 device); 4202 goto out; 4203 } 4204 4205 /* if not r/w, reopen to make r/w */ 4206 ro = bdrv_is_read_only(image_bs); 4207 4208 if (ro) { 4209 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4210 goto out; 4211 } 4212 } 4213 4214 ret = bdrv_change_backing_file(image_bs, backing_file, 4215 image_bs->drv ? image_bs->drv->format_name : ""); 4216 4217 if (ret < 0) { 4218 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4219 backing_file); 4220 /* don't exit here, so we can try to restore open flags if 4221 * appropriate */ 4222 } 4223 4224 if (ro) { 4225 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4226 error_propagate(errp, local_err); 4227 } 4228 4229 out: 4230 aio_context_release(aio_context); 4231 } 4232 4233 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4234 { 4235 QemuOpts *opts; 4236 QDict *qdict; 4237 Error *local_err = NULL; 4238 4239 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4240 if (!opts) { 4241 return; 4242 } 4243 4244 qdict = qemu_opts_to_qdict(opts, NULL); 4245 4246 if (!qdict_get_try_str(qdict, "node-name")) { 4247 qobject_unref(qdict); 4248 error_report("'node-name' needs to be specified"); 4249 goto out; 4250 } 4251 4252 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4253 if (!bs) { 4254 error_report_err(local_err); 4255 goto out; 4256 } 4257 4258 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4259 4260 out: 4261 qemu_opts_del(opts); 4262 } 4263 4264 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4265 { 4266 BlockDriverState *bs; 4267 QObject *obj; 4268 Visitor *v = qobject_output_visitor_new(&obj); 4269 QDict *qdict; 4270 Error *local_err = NULL; 4271 4272 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4273 if (local_err) { 4274 error_propagate(errp, local_err); 4275 goto fail; 4276 } 4277 4278 visit_complete(v, &obj); 4279 qdict = qobject_to(QDict, obj); 4280 4281 qdict_flatten(qdict); 4282 4283 if (!qdict_get_try_str(qdict, "node-name")) { 4284 error_setg(errp, "'node-name' must be specified for the root node"); 4285 goto fail; 4286 } 4287 4288 bs = bds_tree_init(qdict, errp); 4289 if (!bs) { 4290 goto fail; 4291 } 4292 4293 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4294 4295 fail: 4296 visit_free(v); 4297 } 4298 4299 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4300 { 4301 BlockDriverState *bs; 4302 AioContext *ctx; 4303 QObject *obj; 4304 Visitor *v = qobject_output_visitor_new(&obj); 4305 Error *local_err = NULL; 4306 BlockReopenQueue *queue; 4307 QDict *qdict; 4308 4309 /* Check for the selected node name */ 4310 if (!options->has_node_name) { 4311 error_setg(errp, "Node name not specified"); 4312 goto fail; 4313 } 4314 4315 bs = bdrv_find_node(options->node_name); 4316 if (!bs) { 4317 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4318 goto fail; 4319 } 4320 4321 /* Put all options in a QDict and flatten it */ 4322 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4323 if (local_err) { 4324 error_propagate(errp, local_err); 4325 goto fail; 4326 } 4327 4328 visit_complete(v, &obj); 4329 qdict = qobject_to(QDict, obj); 4330 4331 qdict_flatten(qdict); 4332 4333 /* Perform the reopen operation */ 4334 ctx = bdrv_get_aio_context(bs); 4335 aio_context_acquire(ctx); 4336 bdrv_subtree_drained_begin(bs); 4337 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4338 bdrv_reopen_multiple(queue, errp); 4339 bdrv_subtree_drained_end(bs); 4340 aio_context_release(ctx); 4341 4342 fail: 4343 visit_free(v); 4344 } 4345 4346 void qmp_blockdev_del(const char *node_name, Error **errp) 4347 { 4348 AioContext *aio_context; 4349 BlockDriverState *bs; 4350 4351 bs = bdrv_find_node(node_name); 4352 if (!bs) { 4353 error_setg(errp, "Cannot find node %s", node_name); 4354 return; 4355 } 4356 if (bdrv_has_blk(bs)) { 4357 error_setg(errp, "Node %s is in use", node_name); 4358 return; 4359 } 4360 aio_context = bdrv_get_aio_context(bs); 4361 aio_context_acquire(aio_context); 4362 4363 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4364 goto out; 4365 } 4366 4367 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4368 error_setg(errp, "Node %s is not owned by the monitor", 4369 bs->node_name); 4370 goto out; 4371 } 4372 4373 if (bs->refcnt > 1) { 4374 error_setg(errp, "Block device %s is in use", 4375 bdrv_get_device_or_node_name(bs)); 4376 goto out; 4377 } 4378 4379 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4380 bdrv_unref(bs); 4381 4382 out: 4383 aio_context_release(aio_context); 4384 } 4385 4386 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4387 const char *child_name) 4388 { 4389 BdrvChild *child; 4390 4391 QLIST_FOREACH(child, &parent_bs->children, next) { 4392 if (strcmp(child->name, child_name) == 0) { 4393 return child; 4394 } 4395 } 4396 4397 return NULL; 4398 } 4399 4400 void qmp_x_blockdev_change(const char *parent, bool has_child, 4401 const char *child, bool has_node, 4402 const char *node, Error **errp) 4403 { 4404 BlockDriverState *parent_bs, *new_bs = NULL; 4405 BdrvChild *p_child; 4406 4407 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4408 if (!parent_bs) { 4409 return; 4410 } 4411 4412 if (has_child == has_node) { 4413 if (has_child) { 4414 error_setg(errp, "The parameters child and node are in conflict"); 4415 } else { 4416 error_setg(errp, "Either child or node must be specified"); 4417 } 4418 return; 4419 } 4420 4421 if (has_child) { 4422 p_child = bdrv_find_child(parent_bs, child); 4423 if (!p_child) { 4424 error_setg(errp, "Node '%s' does not have child '%s'", 4425 parent, child); 4426 return; 4427 } 4428 bdrv_del_child(parent_bs, p_child, errp); 4429 } 4430 4431 if (has_node) { 4432 new_bs = bdrv_find_node(node); 4433 if (!new_bs) { 4434 error_setg(errp, "Node '%s' not found", node); 4435 return; 4436 } 4437 bdrv_add_child(parent_bs, new_bs, errp); 4438 } 4439 } 4440 4441 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4442 { 4443 BlockJobInfoList *head = NULL, **p_next = &head; 4444 BlockJob *job; 4445 4446 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4447 BlockJobInfoList *elem; 4448 AioContext *aio_context; 4449 4450 if (block_job_is_internal(job)) { 4451 continue; 4452 } 4453 elem = g_new0(BlockJobInfoList, 1); 4454 aio_context = blk_get_aio_context(job->blk); 4455 aio_context_acquire(aio_context); 4456 elem->value = block_job_query(job, errp); 4457 aio_context_release(aio_context); 4458 if (!elem->value) { 4459 g_free(elem); 4460 qapi_free_BlockJobInfoList(head); 4461 return NULL; 4462 } 4463 *p_next = elem; 4464 p_next = &elem->next; 4465 } 4466 4467 return head; 4468 } 4469 4470 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4471 bool has_force, bool force, Error **errp) 4472 { 4473 AioContext *old_context; 4474 AioContext *new_context; 4475 BlockDriverState *bs; 4476 4477 bs = bdrv_find_node(node_name); 4478 if (!bs) { 4479 error_setg(errp, "Cannot find node %s", node_name); 4480 return; 4481 } 4482 4483 /* Protects against accidents. */ 4484 if (!(has_force && force) && bdrv_has_blk(bs)) { 4485 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4486 "be in use (use force=true to override this check)", 4487 node_name); 4488 return; 4489 } 4490 4491 if (iothread->type == QTYPE_QSTRING) { 4492 IOThread *obj = iothread_by_id(iothread->u.s); 4493 if (!obj) { 4494 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4495 return; 4496 } 4497 4498 new_context = iothread_get_aio_context(obj); 4499 } else { 4500 new_context = qemu_get_aio_context(); 4501 } 4502 4503 old_context = bdrv_get_aio_context(bs); 4504 aio_context_acquire(old_context); 4505 4506 bdrv_try_set_aio_context(bs, new_context, errp); 4507 4508 aio_context_release(old_context); 4509 } 4510 4511 void qmp_block_latency_histogram_set( 4512 const char *id, 4513 bool has_boundaries, uint64List *boundaries, 4514 bool has_boundaries_read, uint64List *boundaries_read, 4515 bool has_boundaries_write, uint64List *boundaries_write, 4516 bool has_boundaries_flush, uint64List *boundaries_flush, 4517 Error **errp) 4518 { 4519 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4520 BlockAcctStats *stats; 4521 int ret; 4522 4523 if (!blk) { 4524 return; 4525 } 4526 4527 stats = blk_get_stats(blk); 4528 4529 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4530 !has_boundaries_flush) 4531 { 4532 block_latency_histograms_clear(stats); 4533 return; 4534 } 4535 4536 if (has_boundaries || has_boundaries_read) { 4537 ret = block_latency_histogram_set( 4538 stats, BLOCK_ACCT_READ, 4539 has_boundaries_read ? boundaries_read : boundaries); 4540 if (ret) { 4541 error_setg(errp, "Device '%s' set read boundaries fail", id); 4542 return; 4543 } 4544 } 4545 4546 if (has_boundaries || has_boundaries_write) { 4547 ret = block_latency_histogram_set( 4548 stats, BLOCK_ACCT_WRITE, 4549 has_boundaries_write ? boundaries_write : boundaries); 4550 if (ret) { 4551 error_setg(errp, "Device '%s' set write boundaries fail", id); 4552 return; 4553 } 4554 } 4555 4556 if (has_boundaries || has_boundaries_flush) { 4557 ret = block_latency_histogram_set( 4558 stats, BLOCK_ACCT_FLUSH, 4559 has_boundaries_flush ? boundaries_flush : boundaries); 4560 if (ret) { 4561 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4562 return; 4563 } 4564 } 4565 } 4566 4567 QemuOptsList qemu_common_drive_opts = { 4568 .name = "drive", 4569 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4570 .desc = { 4571 { 4572 .name = "snapshot", 4573 .type = QEMU_OPT_BOOL, 4574 .help = "enable/disable snapshot mode", 4575 },{ 4576 .name = "aio", 4577 .type = QEMU_OPT_STRING, 4578 .help = "host AIO implementation (threads, native)", 4579 },{ 4580 .name = BDRV_OPT_CACHE_WB, 4581 .type = QEMU_OPT_BOOL, 4582 .help = "Enable writeback mode", 4583 },{ 4584 .name = "format", 4585 .type = QEMU_OPT_STRING, 4586 .help = "disk format (raw, qcow2, ...)", 4587 },{ 4588 .name = "rerror", 4589 .type = QEMU_OPT_STRING, 4590 .help = "read error action", 4591 },{ 4592 .name = "werror", 4593 .type = QEMU_OPT_STRING, 4594 .help = "write error action", 4595 },{ 4596 .name = BDRV_OPT_READ_ONLY, 4597 .type = QEMU_OPT_BOOL, 4598 .help = "open drive file as read-only", 4599 }, 4600 4601 THROTTLE_OPTS, 4602 4603 { 4604 .name = "throttling.group", 4605 .type = QEMU_OPT_STRING, 4606 .help = "name of the block throttling group", 4607 },{ 4608 .name = "copy-on-read", 4609 .type = QEMU_OPT_BOOL, 4610 .help = "copy read data from backing file into image file", 4611 },{ 4612 .name = "detect-zeroes", 4613 .type = QEMU_OPT_STRING, 4614 .help = "try to optimize zero writes (off, on, unmap)", 4615 },{ 4616 .name = "stats-account-invalid", 4617 .type = QEMU_OPT_BOOL, 4618 .help = "whether to account for invalid I/O operations " 4619 "in the statistics", 4620 },{ 4621 .name = "stats-account-failed", 4622 .type = QEMU_OPT_BOOL, 4623 .help = "whether to account for failed I/O operations " 4624 "in the statistics", 4625 }, 4626 { /* end of list */ } 4627 }, 4628 }; 4629 4630 QemuOptsList qemu_drive_opts = { 4631 .name = "drive", 4632 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4633 .desc = { 4634 /* 4635 * no elements => accept any params 4636 * validation will happen later 4637 */ 4638 { /* end of list */ } 4639 }, 4640 }; 4641