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/throttle-groups.h" 39 #include "monitor/monitor.h" 40 #include "qemu/error-report.h" 41 #include "qemu/option.h" 42 #include "qemu/config-file.h" 43 #include "qapi/qmp/types.h" 44 #include "qapi-visit.h" 45 #include "qapi/qmp/qerror.h" 46 #include "qapi/qobject-output-visitor.h" 47 #include "sysemu/sysemu.h" 48 #include "sysemu/iothread.h" 49 #include "block/block_int.h" 50 #include "qmp-commands.h" 51 #include "block/trace.h" 52 #include "sysemu/arch_init.h" 53 #include "sysemu/qtest.h" 54 #include "qemu/cutils.h" 55 #include "qemu/help_option.h" 56 #include "qemu/throttle-options.h" 57 58 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 59 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 60 61 static int do_open_tray(const char *blk_name, const char *qdev_id, 62 bool force, Error **errp); 63 static void blockdev_remove_medium(bool has_device, const char *device, 64 bool has_id, const char *id, Error **errp); 65 static void blockdev_insert_medium(bool has_device, const char *device, 66 bool has_id, const char *id, 67 const char *node_name, Error **errp); 68 69 static const char *const if_name[IF_COUNT] = { 70 [IF_NONE] = "none", 71 [IF_IDE] = "ide", 72 [IF_SCSI] = "scsi", 73 [IF_FLOPPY] = "floppy", 74 [IF_PFLASH] = "pflash", 75 [IF_MTD] = "mtd", 76 [IF_SD] = "sd", 77 [IF_VIRTIO] = "virtio", 78 [IF_XEN] = "xen", 79 }; 80 81 static int if_max_devs[IF_COUNT] = { 82 /* 83 * Do not change these numbers! They govern how drive option 84 * index maps to unit and bus. That mapping is ABI. 85 * 86 * All controllers used to implement if=T drives need to support 87 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 88 * Otherwise, some index values map to "impossible" bus, unit 89 * values. 90 * 91 * For instance, if you change [IF_SCSI] to 255, -drive 92 * if=scsi,index=12 no longer means bus=1,unit=5, but 93 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 94 * the drive can't be set up. Regression. 95 */ 96 [IF_IDE] = 2, 97 [IF_SCSI] = 7, 98 }; 99 100 /** 101 * Boards may call this to offer board-by-board overrides 102 * of the default, global values. 103 */ 104 void override_max_devs(BlockInterfaceType type, int max_devs) 105 { 106 BlockBackend *blk; 107 DriveInfo *dinfo; 108 109 if (max_devs <= 0) { 110 return; 111 } 112 113 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 114 dinfo = blk_legacy_dinfo(blk); 115 if (dinfo->type == type) { 116 fprintf(stderr, "Cannot override units-per-bus property of" 117 " the %s interface, because a drive of that type has" 118 " already been added.\n", if_name[type]); 119 g_assert_not_reached(); 120 } 121 } 122 123 if_max_devs[type] = max_devs; 124 } 125 126 /* 127 * We automatically delete the drive when a device using it gets 128 * unplugged. Questionable feature, but we can't just drop it. 129 * Device models call blockdev_mark_auto_del() to schedule the 130 * automatic deletion, and generic qdev code calls blockdev_auto_del() 131 * when deletion is actually safe. 132 */ 133 void blockdev_mark_auto_del(BlockBackend *blk) 134 { 135 DriveInfo *dinfo = blk_legacy_dinfo(blk); 136 BlockDriverState *bs = blk_bs(blk); 137 AioContext *aio_context; 138 139 if (!dinfo) { 140 return; 141 } 142 143 if (bs) { 144 aio_context = bdrv_get_aio_context(bs); 145 aio_context_acquire(aio_context); 146 147 if (bs->job) { 148 block_job_cancel(bs->job); 149 } 150 151 aio_context_release(aio_context); 152 } 153 154 dinfo->auto_del = 1; 155 } 156 157 void blockdev_auto_del(BlockBackend *blk) 158 { 159 DriveInfo *dinfo = blk_legacy_dinfo(blk); 160 161 if (dinfo && dinfo->auto_del) { 162 monitor_remove_blk(blk); 163 blk_unref(blk); 164 } 165 } 166 167 /** 168 * Returns the current mapping of how many units per bus 169 * a particular interface can support. 170 * 171 * A positive integer indicates n units per bus. 172 * 0 implies the mapping has not been established. 173 * -1 indicates an invalid BlockInterfaceType was given. 174 */ 175 int drive_get_max_devs(BlockInterfaceType type) 176 { 177 if (type >= IF_IDE && type < IF_COUNT) { 178 return if_max_devs[type]; 179 } 180 181 return -1; 182 } 183 184 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 185 { 186 int max_devs = if_max_devs[type]; 187 return max_devs ? index / max_devs : 0; 188 } 189 190 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 191 { 192 int max_devs = if_max_devs[type]; 193 return max_devs ? index % max_devs : index; 194 } 195 196 QemuOpts *drive_def(const char *optstr) 197 { 198 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 199 } 200 201 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 202 const char *optstr) 203 { 204 QemuOpts *opts; 205 206 opts = drive_def(optstr); 207 if (!opts) { 208 return NULL; 209 } 210 if (type != IF_DEFAULT) { 211 qemu_opt_set(opts, "if", if_name[type], &error_abort); 212 } 213 if (index >= 0) { 214 qemu_opt_set_number(opts, "index", index, &error_abort); 215 } 216 if (file) 217 qemu_opt_set(opts, "file", file, &error_abort); 218 return opts; 219 } 220 221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 222 { 223 BlockBackend *blk; 224 DriveInfo *dinfo; 225 226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 227 dinfo = blk_legacy_dinfo(blk); 228 if (dinfo && dinfo->type == type 229 && dinfo->bus == bus && dinfo->unit == unit) { 230 return dinfo; 231 } 232 } 233 234 return NULL; 235 } 236 237 void drive_check_orphaned(void) 238 { 239 BlockBackend *blk; 240 DriveInfo *dinfo; 241 Location loc; 242 bool orphans = false; 243 244 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 245 dinfo = blk_legacy_dinfo(blk); 246 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 247 dinfo->type != IF_NONE) { 248 loc_push_none(&loc); 249 qemu_opts_loc_restore(dinfo->opts); 250 error_report("machine type does not support" 251 " if=%s,bus=%d,unit=%d", 252 if_name[dinfo->type], dinfo->bus, dinfo->unit); 253 loc_pop(&loc); 254 orphans = true; 255 } 256 } 257 258 if (orphans) { 259 exit(1); 260 } 261 } 262 263 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 264 { 265 return drive_get(type, 266 drive_index_to_bus_id(type, index), 267 drive_index_to_unit_id(type, index)); 268 } 269 270 int drive_get_max_bus(BlockInterfaceType type) 271 { 272 int max_bus; 273 BlockBackend *blk; 274 DriveInfo *dinfo; 275 276 max_bus = -1; 277 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 278 dinfo = blk_legacy_dinfo(blk); 279 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 280 max_bus = dinfo->bus; 281 } 282 } 283 return max_bus; 284 } 285 286 /* Get a block device. This should only be used for single-drive devices 287 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 288 appropriate bus. */ 289 DriveInfo *drive_get_next(BlockInterfaceType type) 290 { 291 static int next_block_unit[IF_COUNT]; 292 293 return drive_get(type, 0, next_block_unit[type]++); 294 } 295 296 static void bdrv_format_print(void *opaque, const char *name) 297 { 298 error_printf(" %s", name); 299 } 300 301 typedef struct { 302 QEMUBH *bh; 303 BlockDriverState *bs; 304 } BDRVPutRefBH; 305 306 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 307 { 308 if (!strcmp(buf, "ignore")) { 309 return BLOCKDEV_ON_ERROR_IGNORE; 310 } else if (!is_read && !strcmp(buf, "enospc")) { 311 return BLOCKDEV_ON_ERROR_ENOSPC; 312 } else if (!strcmp(buf, "stop")) { 313 return BLOCKDEV_ON_ERROR_STOP; 314 } else if (!strcmp(buf, "report")) { 315 return BLOCKDEV_ON_ERROR_REPORT; 316 } else { 317 error_setg(errp, "'%s' invalid %s error action", 318 buf, is_read ? "read" : "write"); 319 return -1; 320 } 321 } 322 323 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 324 Error **errp) 325 { 326 const QListEntry *entry; 327 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 328 switch (qobject_type(entry->value)) { 329 330 case QTYPE_QSTRING: { 331 unsigned long long length; 332 const char *str = qstring_get_str(qobject_to_qstring(entry->value)); 333 if (parse_uint_full(str, &length, 10) == 0 && 334 length > 0 && length <= UINT_MAX) { 335 block_acct_add_interval(stats, (unsigned) length); 336 } else { 337 error_setg(errp, "Invalid interval length: %s", str); 338 return false; 339 } 340 break; 341 } 342 343 case QTYPE_QNUM: { 344 int64_t length = qnum_get_int(qobject_to_qnum(entry->value)); 345 346 if (length > 0 && length <= UINT_MAX) { 347 block_acct_add_interval(stats, (unsigned) length); 348 } else { 349 error_setg(errp, "Invalid interval length: %" PRId64, length); 350 return false; 351 } 352 break; 353 } 354 355 default: 356 error_setg(errp, "The specification of stats-intervals is invalid"); 357 return false; 358 } 359 } 360 return true; 361 } 362 363 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 364 365 /* All parameters but @opts are optional and may be set to NULL. */ 366 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 367 const char **throttling_group, ThrottleConfig *throttle_cfg, 368 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 369 { 370 Error *local_error = NULL; 371 const char *aio; 372 373 if (bdrv_flags) { 374 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 375 *bdrv_flags |= BDRV_O_COPY_ON_READ; 376 } 377 378 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 379 if (!strcmp(aio, "native")) { 380 *bdrv_flags |= BDRV_O_NATIVE_AIO; 381 } else if (!strcmp(aio, "threads")) { 382 /* this is the default */ 383 } else { 384 error_setg(errp, "invalid aio option"); 385 return; 386 } 387 } 388 } 389 390 /* disk I/O throttling */ 391 if (throttling_group) { 392 *throttling_group = qemu_opt_get(opts, "throttling.group"); 393 } 394 395 if (throttle_cfg) { 396 throttle_config_init(throttle_cfg); 397 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 398 qemu_opt_get_number(opts, "throttling.bps-total", 0); 399 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 400 qemu_opt_get_number(opts, "throttling.bps-read", 0); 401 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 402 qemu_opt_get_number(opts, "throttling.bps-write", 0); 403 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 404 qemu_opt_get_number(opts, "throttling.iops-total", 0); 405 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 406 qemu_opt_get_number(opts, "throttling.iops-read", 0); 407 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 408 qemu_opt_get_number(opts, "throttling.iops-write", 0); 409 410 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 411 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 412 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 413 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 414 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 415 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 416 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 417 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 418 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 419 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 420 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 421 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 422 423 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 424 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 425 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 426 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 427 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 428 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 429 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 430 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 431 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 432 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 433 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 434 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 435 436 throttle_cfg->op_size = 437 qemu_opt_get_number(opts, "throttling.iops-size", 0); 438 439 if (!throttle_is_valid(throttle_cfg, errp)) { 440 return; 441 } 442 } 443 444 if (detect_zeroes) { 445 *detect_zeroes = 446 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 447 qemu_opt_get(opts, "detect-zeroes"), 448 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 449 &local_error); 450 if (local_error) { 451 error_propagate(errp, local_error); 452 return; 453 } 454 } 455 } 456 457 /* Takes the ownership of bs_opts */ 458 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 459 Error **errp) 460 { 461 const char *buf; 462 int bdrv_flags = 0; 463 int on_read_error, on_write_error; 464 bool account_invalid, account_failed; 465 bool writethrough, read_only; 466 BlockBackend *blk; 467 BlockDriverState *bs; 468 ThrottleConfig cfg; 469 int snapshot = 0; 470 Error *error = NULL; 471 QemuOpts *opts; 472 QDict *interval_dict = NULL; 473 QList *interval_list = NULL; 474 const char *id; 475 BlockdevDetectZeroesOptions detect_zeroes = 476 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 477 const char *throttling_group = NULL; 478 479 /* Check common options by copying from bs_opts to opts, all other options 480 * stay in bs_opts for processing by bdrv_open(). */ 481 id = qdict_get_try_str(bs_opts, "id"); 482 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 483 if (error) { 484 error_propagate(errp, error); 485 goto err_no_opts; 486 } 487 488 qemu_opts_absorb_qdict(opts, bs_opts, &error); 489 if (error) { 490 error_propagate(errp, error); 491 goto early_err; 492 } 493 494 if (id) { 495 qdict_del(bs_opts, "id"); 496 } 497 498 /* extract parameters */ 499 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 500 501 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 502 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 503 504 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 505 506 id = qemu_opts_id(opts); 507 508 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 509 qdict_array_split(interval_dict, &interval_list); 510 511 if (qdict_size(interval_dict) != 0) { 512 error_setg(errp, "Invalid option stats-intervals.%s", 513 qdict_first(interval_dict)->key); 514 goto early_err; 515 } 516 517 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 518 &detect_zeroes, &error); 519 if (error) { 520 error_propagate(errp, error); 521 goto early_err; 522 } 523 524 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 525 if (is_help_option(buf)) { 526 error_printf("Supported formats:"); 527 bdrv_iterate_format(bdrv_format_print, NULL); 528 error_printf("\n"); 529 goto early_err; 530 } 531 532 if (qdict_haskey(bs_opts, "driver")) { 533 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 534 goto early_err; 535 } 536 qdict_put_str(bs_opts, "driver", buf); 537 } 538 539 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 540 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 541 on_write_error = parse_block_error_action(buf, 0, &error); 542 if (error) { 543 error_propagate(errp, error); 544 goto early_err; 545 } 546 } 547 548 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 549 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 550 on_read_error = parse_block_error_action(buf, 1, &error); 551 if (error) { 552 error_propagate(errp, error); 553 goto early_err; 554 } 555 } 556 557 if (snapshot) { 558 bdrv_flags |= BDRV_O_SNAPSHOT; 559 } 560 561 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 562 563 /* init */ 564 if ((!file || !*file) && !qdict_size(bs_opts)) { 565 BlockBackendRootState *blk_rs; 566 567 blk = blk_new(0, BLK_PERM_ALL); 568 blk_rs = blk_get_root_state(blk); 569 blk_rs->open_flags = bdrv_flags; 570 blk_rs->read_only = read_only; 571 blk_rs->detect_zeroes = detect_zeroes; 572 573 QDECREF(bs_opts); 574 } else { 575 if (file && !*file) { 576 file = NULL; 577 } 578 579 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 580 * with other callers) rather than what we want as the real defaults. 581 * Apply the defaults here instead. */ 582 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 583 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 584 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 585 read_only ? "on" : "off"); 586 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 587 588 if (runstate_check(RUN_STATE_INMIGRATE)) { 589 bdrv_flags |= BDRV_O_INACTIVE; 590 } 591 592 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 593 if (!blk) { 594 goto err_no_bs_opts; 595 } 596 bs = blk_bs(blk); 597 598 bs->detect_zeroes = detect_zeroes; 599 600 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 601 602 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 603 blk_unref(blk); 604 blk = NULL; 605 goto err_no_bs_opts; 606 } 607 } 608 609 /* disk I/O throttling */ 610 if (throttle_enabled(&cfg)) { 611 if (!throttling_group) { 612 throttling_group = id; 613 } 614 blk_io_limits_enable(blk, throttling_group); 615 blk_set_io_limits(blk, &cfg); 616 } 617 618 blk_set_enable_write_cache(blk, !writethrough); 619 blk_set_on_error(blk, on_read_error, on_write_error); 620 621 if (!monitor_add_blk(blk, id, errp)) { 622 blk_unref(blk); 623 blk = NULL; 624 goto err_no_bs_opts; 625 } 626 627 err_no_bs_opts: 628 qemu_opts_del(opts); 629 QDECREF(interval_dict); 630 QDECREF(interval_list); 631 return blk; 632 633 early_err: 634 qemu_opts_del(opts); 635 QDECREF(interval_dict); 636 QDECREF(interval_list); 637 err_no_opts: 638 QDECREF(bs_opts); 639 return NULL; 640 } 641 642 /* Takes the ownership of bs_opts */ 643 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 644 { 645 int bdrv_flags = 0; 646 647 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 648 * with other callers) rather than what we want as the real defaults. 649 * Apply the defaults here instead. */ 650 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 651 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 652 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 653 654 if (runstate_check(RUN_STATE_INMIGRATE)) { 655 bdrv_flags |= BDRV_O_INACTIVE; 656 } 657 658 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 659 } 660 661 void blockdev_close_all_bdrv_states(void) 662 { 663 BlockDriverState *bs, *next_bs; 664 665 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 666 AioContext *ctx = bdrv_get_aio_context(bs); 667 668 aio_context_acquire(ctx); 669 bdrv_unref(bs); 670 aio_context_release(ctx); 671 } 672 } 673 674 /* Iterates over the list of monitor-owned BlockDriverStates */ 675 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 676 { 677 return bs ? QTAILQ_NEXT(bs, monitor_list) 678 : QTAILQ_FIRST(&monitor_bdrv_states); 679 } 680 681 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 682 Error **errp) 683 { 684 const char *value; 685 686 value = qemu_opt_get(opts, from); 687 if (value) { 688 if (qemu_opt_find(opts, to)) { 689 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 690 "same time", to, from); 691 return; 692 } 693 } 694 695 /* rename all items in opts */ 696 while ((value = qemu_opt_get(opts, from))) { 697 qemu_opt_set(opts, to, value, &error_abort); 698 qemu_opt_unset(opts, from); 699 } 700 } 701 702 QemuOptsList qemu_legacy_drive_opts = { 703 .name = "drive", 704 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 705 .desc = { 706 { 707 .name = "bus", 708 .type = QEMU_OPT_NUMBER, 709 .help = "bus number", 710 },{ 711 .name = "unit", 712 .type = QEMU_OPT_NUMBER, 713 .help = "unit number (i.e. lun for scsi)", 714 },{ 715 .name = "index", 716 .type = QEMU_OPT_NUMBER, 717 .help = "index number", 718 },{ 719 .name = "media", 720 .type = QEMU_OPT_STRING, 721 .help = "media type (disk, cdrom)", 722 },{ 723 .name = "if", 724 .type = QEMU_OPT_STRING, 725 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 726 },{ 727 .name = "cyls", 728 .type = QEMU_OPT_NUMBER, 729 .help = "number of cylinders (ide disk geometry)", 730 },{ 731 .name = "heads", 732 .type = QEMU_OPT_NUMBER, 733 .help = "number of heads (ide disk geometry)", 734 },{ 735 .name = "secs", 736 .type = QEMU_OPT_NUMBER, 737 .help = "number of sectors (ide disk geometry)", 738 },{ 739 .name = "trans", 740 .type = QEMU_OPT_STRING, 741 .help = "chs translation (auto, lba, none)", 742 },{ 743 .name = "addr", 744 .type = QEMU_OPT_STRING, 745 .help = "pci address (virtio only)", 746 },{ 747 .name = "serial", 748 .type = QEMU_OPT_STRING, 749 .help = "disk serial number", 750 },{ 751 .name = "file", 752 .type = QEMU_OPT_STRING, 753 .help = "file name", 754 }, 755 756 /* Options that are passed on, but have special semantics with -drive */ 757 { 758 .name = BDRV_OPT_READ_ONLY, 759 .type = QEMU_OPT_BOOL, 760 .help = "open drive file as read-only", 761 },{ 762 .name = "rerror", 763 .type = QEMU_OPT_STRING, 764 .help = "read error action", 765 },{ 766 .name = "werror", 767 .type = QEMU_OPT_STRING, 768 .help = "write error action", 769 },{ 770 .name = "copy-on-read", 771 .type = QEMU_OPT_BOOL, 772 .help = "copy read data from backing file into image file", 773 }, 774 775 { /* end of list */ } 776 }, 777 }; 778 779 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 780 { 781 const char *value; 782 BlockBackend *blk; 783 DriveInfo *dinfo = NULL; 784 QDict *bs_opts; 785 QemuOpts *legacy_opts; 786 DriveMediaType media = MEDIA_DISK; 787 BlockInterfaceType type; 788 int cyls, heads, secs, translation; 789 int max_devs, bus_id, unit_id, index; 790 const char *devaddr; 791 const char *werror, *rerror; 792 bool read_only = false; 793 bool copy_on_read; 794 const char *serial; 795 const char *filename; 796 Error *local_err = NULL; 797 int i; 798 const char *deprecated[] = { 799 "serial", "trans", "secs", "heads", "cyls", "addr" 800 }; 801 802 /* Change legacy command line options into QMP ones */ 803 static const struct { 804 const char *from; 805 const char *to; 806 } opt_renames[] = { 807 { "iops", "throttling.iops-total" }, 808 { "iops_rd", "throttling.iops-read" }, 809 { "iops_wr", "throttling.iops-write" }, 810 811 { "bps", "throttling.bps-total" }, 812 { "bps_rd", "throttling.bps-read" }, 813 { "bps_wr", "throttling.bps-write" }, 814 815 { "iops_max", "throttling.iops-total-max" }, 816 { "iops_rd_max", "throttling.iops-read-max" }, 817 { "iops_wr_max", "throttling.iops-write-max" }, 818 819 { "bps_max", "throttling.bps-total-max" }, 820 { "bps_rd_max", "throttling.bps-read-max" }, 821 { "bps_wr_max", "throttling.bps-write-max" }, 822 823 { "iops_size", "throttling.iops-size" }, 824 825 { "group", "throttling.group" }, 826 827 { "readonly", BDRV_OPT_READ_ONLY }, 828 }; 829 830 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 831 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 832 &local_err); 833 if (local_err) { 834 error_report_err(local_err); 835 return NULL; 836 } 837 } 838 839 value = qemu_opt_get(all_opts, "cache"); 840 if (value) { 841 int flags = 0; 842 bool writethrough; 843 844 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 845 error_report("invalid cache option"); 846 return NULL; 847 } 848 849 /* Specific options take precedence */ 850 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 851 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 852 !writethrough, &error_abort); 853 } 854 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 855 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 856 !!(flags & BDRV_O_NOCACHE), &error_abort); 857 } 858 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 859 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 860 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 861 } 862 qemu_opt_unset(all_opts, "cache"); 863 } 864 865 /* Get a QDict for processing the options */ 866 bs_opts = qdict_new(); 867 qemu_opts_to_qdict(all_opts, bs_opts); 868 869 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 870 &error_abort); 871 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 872 if (local_err) { 873 error_report_err(local_err); 874 goto fail; 875 } 876 877 /* Other deprecated options */ 878 if (!qtest_enabled()) { 879 for (i = 0; i < ARRAY_SIZE(deprecated); i++) { 880 if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) { 881 error_report("'%s' is deprecated, please use the corresponding " 882 "option of '-device' instead", deprecated[i]); 883 } 884 } 885 } 886 887 /* Media type */ 888 value = qemu_opt_get(legacy_opts, "media"); 889 if (value) { 890 if (!strcmp(value, "disk")) { 891 media = MEDIA_DISK; 892 } else if (!strcmp(value, "cdrom")) { 893 media = MEDIA_CDROM; 894 read_only = true; 895 } else { 896 error_report("'%s' invalid media", value); 897 goto fail; 898 } 899 } 900 901 /* copy-on-read is disabled with a warning for read-only devices */ 902 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 903 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 904 905 if (read_only && copy_on_read) { 906 warn_report("disabling copy-on-read on read-only drive"); 907 copy_on_read = false; 908 } 909 910 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 911 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 912 913 /* Controller type */ 914 value = qemu_opt_get(legacy_opts, "if"); 915 if (value) { 916 for (type = 0; 917 type < IF_COUNT && strcmp(value, if_name[type]); 918 type++) { 919 } 920 if (type == IF_COUNT) { 921 error_report("unsupported bus type '%s'", value); 922 goto fail; 923 } 924 } else { 925 type = block_default_type; 926 } 927 928 /* Geometry */ 929 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 930 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 931 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 932 933 if (cyls || heads || secs) { 934 if (cyls < 1) { 935 error_report("invalid physical cyls number"); 936 goto fail; 937 } 938 if (heads < 1) { 939 error_report("invalid physical heads number"); 940 goto fail; 941 } 942 if (secs < 1) { 943 error_report("invalid physical secs number"); 944 goto fail; 945 } 946 } 947 948 translation = BIOS_ATA_TRANSLATION_AUTO; 949 value = qemu_opt_get(legacy_opts, "trans"); 950 if (value != NULL) { 951 if (!cyls) { 952 error_report("'%s' trans must be used with cyls, heads and secs", 953 value); 954 goto fail; 955 } 956 if (!strcmp(value, "none")) { 957 translation = BIOS_ATA_TRANSLATION_NONE; 958 } else if (!strcmp(value, "lba")) { 959 translation = BIOS_ATA_TRANSLATION_LBA; 960 } else if (!strcmp(value, "large")) { 961 translation = BIOS_ATA_TRANSLATION_LARGE; 962 } else if (!strcmp(value, "rechs")) { 963 translation = BIOS_ATA_TRANSLATION_RECHS; 964 } else if (!strcmp(value, "auto")) { 965 translation = BIOS_ATA_TRANSLATION_AUTO; 966 } else { 967 error_report("'%s' invalid translation type", value); 968 goto fail; 969 } 970 } 971 972 if (media == MEDIA_CDROM) { 973 if (cyls || secs || heads) { 974 error_report("CHS can't be set with media=cdrom"); 975 goto fail; 976 } 977 } 978 979 /* Device address specified by bus/unit or index. 980 * If none was specified, try to find the first free one. */ 981 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 982 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 983 index = qemu_opt_get_number(legacy_opts, "index", -1); 984 985 max_devs = if_max_devs[type]; 986 987 if (index != -1) { 988 if (bus_id != 0 || unit_id != -1) { 989 error_report("index cannot be used with bus and unit"); 990 goto fail; 991 } 992 bus_id = drive_index_to_bus_id(type, index); 993 unit_id = drive_index_to_unit_id(type, index); 994 } 995 996 if (unit_id == -1) { 997 unit_id = 0; 998 while (drive_get(type, bus_id, unit_id) != NULL) { 999 unit_id++; 1000 if (max_devs && unit_id >= max_devs) { 1001 unit_id -= max_devs; 1002 bus_id++; 1003 } 1004 } 1005 } 1006 1007 if (max_devs && unit_id >= max_devs) { 1008 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 1009 goto fail; 1010 } 1011 1012 if (drive_get(type, bus_id, unit_id) != NULL) { 1013 error_report("drive with bus=%d, unit=%d (index=%d) exists", 1014 bus_id, unit_id, index); 1015 goto fail; 1016 } 1017 1018 /* Serial number */ 1019 serial = qemu_opt_get(legacy_opts, "serial"); 1020 1021 /* no id supplied -> create one */ 1022 if (qemu_opts_id(all_opts) == NULL) { 1023 char *new_id; 1024 const char *mediastr = ""; 1025 if (type == IF_IDE || type == IF_SCSI) { 1026 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 1027 } 1028 if (max_devs) { 1029 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 1030 mediastr, unit_id); 1031 } else { 1032 new_id = g_strdup_printf("%s%s%i", if_name[type], 1033 mediastr, unit_id); 1034 } 1035 qdict_put_str(bs_opts, "id", new_id); 1036 g_free(new_id); 1037 } 1038 1039 /* Add virtio block device */ 1040 devaddr = qemu_opt_get(legacy_opts, "addr"); 1041 if (devaddr && type != IF_VIRTIO) { 1042 error_report("addr is not supported by this bus type"); 1043 goto fail; 1044 } 1045 1046 if (type == IF_VIRTIO) { 1047 QemuOpts *devopts; 1048 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 1049 &error_abort); 1050 if (arch_type == QEMU_ARCH_S390X) { 1051 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 1052 } else { 1053 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 1054 } 1055 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 1056 &error_abort); 1057 if (devaddr) { 1058 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 1059 } 1060 } 1061 1062 filename = qemu_opt_get(legacy_opts, "file"); 1063 1064 /* Check werror/rerror compatibility with if=... */ 1065 werror = qemu_opt_get(legacy_opts, "werror"); 1066 if (werror != NULL) { 1067 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 1068 type != IF_NONE) { 1069 error_report("werror is not supported by this bus type"); 1070 goto fail; 1071 } 1072 qdict_put_str(bs_opts, "werror", werror); 1073 } 1074 1075 rerror = qemu_opt_get(legacy_opts, "rerror"); 1076 if (rerror != NULL) { 1077 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 1078 type != IF_NONE) { 1079 error_report("rerror is not supported by this bus type"); 1080 goto fail; 1081 } 1082 qdict_put_str(bs_opts, "rerror", rerror); 1083 } 1084 1085 /* Actual block device init: Functionality shared with blockdev-add */ 1086 blk = blockdev_init(filename, bs_opts, &local_err); 1087 bs_opts = NULL; 1088 if (!blk) { 1089 if (local_err) { 1090 error_report_err(local_err); 1091 } 1092 goto fail; 1093 } else { 1094 assert(!local_err); 1095 } 1096 1097 /* Create legacy DriveInfo */ 1098 dinfo = g_malloc0(sizeof(*dinfo)); 1099 dinfo->opts = all_opts; 1100 1101 dinfo->cyls = cyls; 1102 dinfo->heads = heads; 1103 dinfo->secs = secs; 1104 dinfo->trans = translation; 1105 1106 dinfo->type = type; 1107 dinfo->bus = bus_id; 1108 dinfo->unit = unit_id; 1109 dinfo->devaddr = devaddr; 1110 dinfo->serial = g_strdup(serial); 1111 1112 blk_set_legacy_dinfo(blk, dinfo); 1113 1114 switch(type) { 1115 case IF_IDE: 1116 case IF_SCSI: 1117 case IF_XEN: 1118 case IF_NONE: 1119 dinfo->media_cd = media == MEDIA_CDROM; 1120 break; 1121 default: 1122 break; 1123 } 1124 1125 fail: 1126 qemu_opts_del(legacy_opts); 1127 QDECREF(bs_opts); 1128 return dinfo; 1129 } 1130 1131 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1132 { 1133 BlockDriverState *bs; 1134 1135 bs = bdrv_lookup_bs(name, name, errp); 1136 if (bs == NULL) { 1137 return NULL; 1138 } 1139 1140 if (!bdrv_is_root_node(bs)) { 1141 error_setg(errp, "Need a root block node"); 1142 return NULL; 1143 } 1144 1145 if (!bdrv_is_inserted(bs)) { 1146 error_setg(errp, "Device has no medium"); 1147 return NULL; 1148 } 1149 1150 return bs; 1151 } 1152 1153 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1154 Error **errp) 1155 { 1156 BlockBackend *blk; 1157 1158 if (!blk_name == !qdev_id) { 1159 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1160 return NULL; 1161 } 1162 1163 if (qdev_id) { 1164 blk = blk_by_qdev_id(qdev_id, errp); 1165 } else { 1166 blk = blk_by_name(blk_name); 1167 if (blk == NULL) { 1168 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1169 "Device '%s' not found", blk_name); 1170 } 1171 } 1172 1173 return blk; 1174 } 1175 1176 void hmp_commit(Monitor *mon, const QDict *qdict) 1177 { 1178 const char *device = qdict_get_str(qdict, "device"); 1179 BlockBackend *blk; 1180 int ret; 1181 1182 if (!strcmp(device, "all")) { 1183 ret = blk_commit_all(); 1184 } else { 1185 BlockDriverState *bs; 1186 AioContext *aio_context; 1187 1188 blk = blk_by_name(device); 1189 if (!blk) { 1190 monitor_printf(mon, "Device '%s' not found\n", device); 1191 return; 1192 } 1193 if (!blk_is_available(blk)) { 1194 monitor_printf(mon, "Device '%s' has no medium\n", device); 1195 return; 1196 } 1197 1198 bs = blk_bs(blk); 1199 aio_context = bdrv_get_aio_context(bs); 1200 aio_context_acquire(aio_context); 1201 1202 ret = bdrv_commit(bs); 1203 1204 aio_context_release(aio_context); 1205 } 1206 if (ret < 0) { 1207 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1208 strerror(-ret)); 1209 } 1210 } 1211 1212 static void blockdev_do_action(TransactionAction *action, Error **errp) 1213 { 1214 TransactionActionList list; 1215 1216 list.value = action; 1217 list.next = NULL; 1218 qmp_transaction(&list, false, NULL, errp); 1219 } 1220 1221 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1222 bool has_node_name, const char *node_name, 1223 const char *snapshot_file, 1224 bool has_snapshot_node_name, 1225 const char *snapshot_node_name, 1226 bool has_format, const char *format, 1227 bool has_mode, NewImageMode mode, Error **errp) 1228 { 1229 BlockdevSnapshotSync snapshot = { 1230 .has_device = has_device, 1231 .device = (char *) device, 1232 .has_node_name = has_node_name, 1233 .node_name = (char *) node_name, 1234 .snapshot_file = (char *) snapshot_file, 1235 .has_snapshot_node_name = has_snapshot_node_name, 1236 .snapshot_node_name = (char *) snapshot_node_name, 1237 .has_format = has_format, 1238 .format = (char *) format, 1239 .has_mode = has_mode, 1240 .mode = mode, 1241 }; 1242 TransactionAction action = { 1243 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1244 .u.blockdev_snapshot_sync.data = &snapshot, 1245 }; 1246 blockdev_do_action(&action, errp); 1247 } 1248 1249 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1250 Error **errp) 1251 { 1252 BlockdevSnapshot snapshot_data = { 1253 .node = (char *) node, 1254 .overlay = (char *) overlay 1255 }; 1256 TransactionAction action = { 1257 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1258 .u.blockdev_snapshot.data = &snapshot_data, 1259 }; 1260 blockdev_do_action(&action, errp); 1261 } 1262 1263 void qmp_blockdev_snapshot_internal_sync(const char *device, 1264 const char *name, 1265 Error **errp) 1266 { 1267 BlockdevSnapshotInternal snapshot = { 1268 .device = (char *) device, 1269 .name = (char *) name 1270 }; 1271 TransactionAction action = { 1272 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1273 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1274 }; 1275 blockdev_do_action(&action, errp); 1276 } 1277 1278 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1279 bool has_id, 1280 const char *id, 1281 bool has_name, 1282 const char *name, 1283 Error **errp) 1284 { 1285 BlockDriverState *bs; 1286 AioContext *aio_context; 1287 QEMUSnapshotInfo sn; 1288 Error *local_err = NULL; 1289 SnapshotInfo *info = NULL; 1290 int ret; 1291 1292 bs = qmp_get_root_bs(device, errp); 1293 if (!bs) { 1294 return NULL; 1295 } 1296 aio_context = bdrv_get_aio_context(bs); 1297 aio_context_acquire(aio_context); 1298 1299 if (!has_id) { 1300 id = NULL; 1301 } 1302 1303 if (!has_name) { 1304 name = NULL; 1305 } 1306 1307 if (!id && !name) { 1308 error_setg(errp, "Name or id must be provided"); 1309 goto out_aio_context; 1310 } 1311 1312 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1313 goto out_aio_context; 1314 } 1315 1316 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1317 if (local_err) { 1318 error_propagate(errp, local_err); 1319 goto out_aio_context; 1320 } 1321 if (!ret) { 1322 error_setg(errp, 1323 "Snapshot with id '%s' and name '%s' does not exist on " 1324 "device '%s'", 1325 STR_OR_NULL(id), STR_OR_NULL(name), device); 1326 goto out_aio_context; 1327 } 1328 1329 bdrv_snapshot_delete(bs, id, name, &local_err); 1330 if (local_err) { 1331 error_propagate(errp, local_err); 1332 goto out_aio_context; 1333 } 1334 1335 aio_context_release(aio_context); 1336 1337 info = g_new0(SnapshotInfo, 1); 1338 info->id = g_strdup(sn.id_str); 1339 info->name = g_strdup(sn.name); 1340 info->date_nsec = sn.date_nsec; 1341 info->date_sec = sn.date_sec; 1342 info->vm_state_size = sn.vm_state_size; 1343 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1344 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1345 1346 return info; 1347 1348 out_aio_context: 1349 aio_context_release(aio_context); 1350 return NULL; 1351 } 1352 1353 /** 1354 * block_dirty_bitmap_lookup: 1355 * Return a dirty bitmap (if present), after validating 1356 * the node reference and bitmap names. 1357 * 1358 * @node: The name of the BDS node to search for bitmaps 1359 * @name: The name of the bitmap to search for 1360 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1361 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1362 * @errp: Output pointer for error information. Can be NULL. 1363 * 1364 * @return: A bitmap object on success, or NULL on failure. 1365 */ 1366 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1367 const char *name, 1368 BlockDriverState **pbs, 1369 Error **errp) 1370 { 1371 BlockDriverState *bs; 1372 BdrvDirtyBitmap *bitmap; 1373 1374 if (!node) { 1375 error_setg(errp, "Node cannot be NULL"); 1376 return NULL; 1377 } 1378 if (!name) { 1379 error_setg(errp, "Bitmap name cannot be NULL"); 1380 return NULL; 1381 } 1382 bs = bdrv_lookup_bs(node, node, NULL); 1383 if (!bs) { 1384 error_setg(errp, "Node '%s' not found", node); 1385 return NULL; 1386 } 1387 1388 bitmap = bdrv_find_dirty_bitmap(bs, name); 1389 if (!bitmap) { 1390 error_setg(errp, "Dirty bitmap '%s' not found", name); 1391 return NULL; 1392 } 1393 1394 if (pbs) { 1395 *pbs = bs; 1396 } 1397 1398 return bitmap; 1399 } 1400 1401 /* New and old BlockDriverState structs for atomic group operations */ 1402 1403 typedef struct BlkActionState BlkActionState; 1404 1405 /** 1406 * BlkActionOps: 1407 * Table of operations that define an Action. 1408 * 1409 * @instance_size: Size of state struct, in bytes. 1410 * @prepare: Prepare the work, must NOT be NULL. 1411 * @commit: Commit the changes, can be NULL. 1412 * @abort: Abort the changes on fail, can be NULL. 1413 * @clean: Clean up resources after all transaction actions have called 1414 * commit() or abort(). Can be NULL. 1415 * 1416 * Only prepare() may fail. In a single transaction, only one of commit() or 1417 * abort() will be called. clean() will always be called if it is present. 1418 */ 1419 typedef struct BlkActionOps { 1420 size_t instance_size; 1421 void (*prepare)(BlkActionState *common, Error **errp); 1422 void (*commit)(BlkActionState *common); 1423 void (*abort)(BlkActionState *common); 1424 void (*clean)(BlkActionState *common); 1425 } BlkActionOps; 1426 1427 /** 1428 * BlkActionState: 1429 * Describes one Action's state within a Transaction. 1430 * 1431 * @action: QAPI-defined enum identifying which Action to perform. 1432 * @ops: Table of ActionOps this Action can perform. 1433 * @block_job_txn: Transaction which this action belongs to. 1434 * @entry: List membership for all Actions in this Transaction. 1435 * 1436 * This structure must be arranged as first member in a subclassed type, 1437 * assuming that the compiler will also arrange it to the same offsets as the 1438 * base class. 1439 */ 1440 struct BlkActionState { 1441 TransactionAction *action; 1442 const BlkActionOps *ops; 1443 BlockJobTxn *block_job_txn; 1444 TransactionProperties *txn_props; 1445 QSIMPLEQ_ENTRY(BlkActionState) entry; 1446 }; 1447 1448 /* internal snapshot private data */ 1449 typedef struct InternalSnapshotState { 1450 BlkActionState common; 1451 BlockDriverState *bs; 1452 QEMUSnapshotInfo sn; 1453 bool created; 1454 } InternalSnapshotState; 1455 1456 1457 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1458 { 1459 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1460 error_setg(errp, 1461 "Action '%s' does not support Transaction property " 1462 "completion-mode = %s", 1463 TransactionActionKind_str(s->action->type), 1464 ActionCompletionMode_str(s->txn_props->completion_mode)); 1465 return -1; 1466 } 1467 return 0; 1468 } 1469 1470 static void internal_snapshot_prepare(BlkActionState *common, 1471 Error **errp) 1472 { 1473 Error *local_err = NULL; 1474 const char *device; 1475 const char *name; 1476 BlockDriverState *bs; 1477 QEMUSnapshotInfo old_sn, *sn; 1478 bool ret; 1479 qemu_timeval tv; 1480 BlockdevSnapshotInternal *internal; 1481 InternalSnapshotState *state; 1482 AioContext *aio_context; 1483 int ret1; 1484 1485 g_assert(common->action->type == 1486 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1487 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1488 state = DO_UPCAST(InternalSnapshotState, common, common); 1489 1490 /* 1. parse input */ 1491 device = internal->device; 1492 name = internal->name; 1493 1494 /* 2. check for validation */ 1495 if (action_check_completion_mode(common, errp) < 0) { 1496 return; 1497 } 1498 1499 bs = qmp_get_root_bs(device, errp); 1500 if (!bs) { 1501 return; 1502 } 1503 1504 aio_context = bdrv_get_aio_context(bs); 1505 aio_context_acquire(aio_context); 1506 1507 state->bs = bs; 1508 1509 /* Paired with .clean() */ 1510 bdrv_drained_begin(bs); 1511 1512 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1513 goto out; 1514 } 1515 1516 if (bdrv_is_read_only(bs)) { 1517 error_setg(errp, "Device '%s' is read only", device); 1518 goto out; 1519 } 1520 1521 if (!bdrv_can_snapshot(bs)) { 1522 error_setg(errp, "Block format '%s' used by device '%s' " 1523 "does not support internal snapshots", 1524 bs->drv->format_name, device); 1525 goto out; 1526 } 1527 1528 if (!strlen(name)) { 1529 error_setg(errp, "Name is empty"); 1530 goto out; 1531 } 1532 1533 /* check whether a snapshot with name exist */ 1534 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1535 &local_err); 1536 if (local_err) { 1537 error_propagate(errp, local_err); 1538 goto out; 1539 } else if (ret) { 1540 error_setg(errp, 1541 "Snapshot with name '%s' already exists on device '%s'", 1542 name, device); 1543 goto out; 1544 } 1545 1546 /* 3. take the snapshot */ 1547 sn = &state->sn; 1548 pstrcpy(sn->name, sizeof(sn->name), name); 1549 qemu_gettimeofday(&tv); 1550 sn->date_sec = tv.tv_sec; 1551 sn->date_nsec = tv.tv_usec * 1000; 1552 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1553 1554 ret1 = bdrv_snapshot_create(bs, sn); 1555 if (ret1 < 0) { 1556 error_setg_errno(errp, -ret1, 1557 "Failed to create snapshot '%s' on device '%s'", 1558 name, device); 1559 goto out; 1560 } 1561 1562 /* 4. succeed, mark a snapshot is created */ 1563 state->created = true; 1564 1565 out: 1566 aio_context_release(aio_context); 1567 } 1568 1569 static void internal_snapshot_abort(BlkActionState *common) 1570 { 1571 InternalSnapshotState *state = 1572 DO_UPCAST(InternalSnapshotState, common, common); 1573 BlockDriverState *bs = state->bs; 1574 QEMUSnapshotInfo *sn = &state->sn; 1575 AioContext *aio_context; 1576 Error *local_error = NULL; 1577 1578 if (!state->created) { 1579 return; 1580 } 1581 1582 aio_context = bdrv_get_aio_context(state->bs); 1583 aio_context_acquire(aio_context); 1584 1585 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1586 error_reportf_err(local_error, 1587 "Failed to delete snapshot with id '%s' and " 1588 "name '%s' on device '%s' in abort: ", 1589 sn->id_str, sn->name, 1590 bdrv_get_device_name(bs)); 1591 } 1592 1593 aio_context_release(aio_context); 1594 } 1595 1596 static void internal_snapshot_clean(BlkActionState *common) 1597 { 1598 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1599 common, common); 1600 AioContext *aio_context; 1601 1602 if (!state->bs) { 1603 return; 1604 } 1605 1606 aio_context = bdrv_get_aio_context(state->bs); 1607 aio_context_acquire(aio_context); 1608 1609 bdrv_drained_end(state->bs); 1610 1611 aio_context_release(aio_context); 1612 } 1613 1614 /* external snapshot private data */ 1615 typedef struct ExternalSnapshotState { 1616 BlkActionState common; 1617 BlockDriverState *old_bs; 1618 BlockDriverState *new_bs; 1619 bool overlay_appended; 1620 } ExternalSnapshotState; 1621 1622 static void external_snapshot_prepare(BlkActionState *common, 1623 Error **errp) 1624 { 1625 int flags = 0; 1626 QDict *options = NULL; 1627 Error *local_err = NULL; 1628 /* Device and node name of the image to generate the snapshot from */ 1629 const char *device; 1630 const char *node_name; 1631 /* Reference to the new image (for 'blockdev-snapshot') */ 1632 const char *snapshot_ref; 1633 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1634 const char *new_image_file; 1635 ExternalSnapshotState *state = 1636 DO_UPCAST(ExternalSnapshotState, common, common); 1637 TransactionAction *action = common->action; 1638 AioContext *aio_context; 1639 1640 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1641 * purpose but a different set of parameters */ 1642 switch (action->type) { 1643 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1644 { 1645 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1646 device = s->node; 1647 node_name = s->node; 1648 new_image_file = NULL; 1649 snapshot_ref = s->overlay; 1650 } 1651 break; 1652 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1653 { 1654 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1655 device = s->has_device ? s->device : NULL; 1656 node_name = s->has_node_name ? s->node_name : NULL; 1657 new_image_file = s->snapshot_file; 1658 snapshot_ref = NULL; 1659 } 1660 break; 1661 default: 1662 g_assert_not_reached(); 1663 } 1664 1665 /* start processing */ 1666 if (action_check_completion_mode(common, errp) < 0) { 1667 return; 1668 } 1669 1670 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1671 if (!state->old_bs) { 1672 return; 1673 } 1674 1675 aio_context = bdrv_get_aio_context(state->old_bs); 1676 aio_context_acquire(aio_context); 1677 1678 /* Paired with .clean() */ 1679 bdrv_drained_begin(state->old_bs); 1680 1681 if (!bdrv_is_inserted(state->old_bs)) { 1682 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1683 goto out; 1684 } 1685 1686 if (bdrv_op_is_blocked(state->old_bs, 1687 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1688 goto out; 1689 } 1690 1691 if (!bdrv_is_read_only(state->old_bs)) { 1692 if (bdrv_flush(state->old_bs)) { 1693 error_setg(errp, QERR_IO_ERROR); 1694 goto out; 1695 } 1696 } 1697 1698 if (!bdrv_is_first_non_filter(state->old_bs)) { 1699 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1700 goto out; 1701 } 1702 1703 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1704 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1705 const char *format = s->has_format ? s->format : "qcow2"; 1706 enum NewImageMode mode; 1707 const char *snapshot_node_name = 1708 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1709 1710 if (node_name && !snapshot_node_name) { 1711 error_setg(errp, "New snapshot node name missing"); 1712 goto out; 1713 } 1714 1715 if (snapshot_node_name && 1716 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1717 error_setg(errp, "New snapshot node name already in use"); 1718 goto out; 1719 } 1720 1721 flags = state->old_bs->open_flags; 1722 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1723 flags |= BDRV_O_NO_BACKING; 1724 1725 /* create new image w/backing file */ 1726 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1727 if (mode != NEW_IMAGE_MODE_EXISTING) { 1728 int64_t size = bdrv_getlength(state->old_bs); 1729 if (size < 0) { 1730 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1731 goto out; 1732 } 1733 bdrv_img_create(new_image_file, format, 1734 state->old_bs->filename, 1735 state->old_bs->drv->format_name, 1736 NULL, size, flags, false, &local_err); 1737 if (local_err) { 1738 error_propagate(errp, local_err); 1739 goto out; 1740 } 1741 } 1742 1743 options = qdict_new(); 1744 if (s->has_snapshot_node_name) { 1745 qdict_put_str(options, "node-name", snapshot_node_name); 1746 } 1747 qdict_put_str(options, "driver", format); 1748 } 1749 1750 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1751 errp); 1752 /* We will manually add the backing_hd field to the bs later */ 1753 if (!state->new_bs) { 1754 goto out; 1755 } 1756 1757 if (bdrv_has_blk(state->new_bs)) { 1758 error_setg(errp, "The snapshot is already in use"); 1759 goto out; 1760 } 1761 1762 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1763 errp)) { 1764 goto out; 1765 } 1766 1767 if (state->new_bs->backing != NULL) { 1768 error_setg(errp, "The snapshot already has a backing image"); 1769 goto out; 1770 } 1771 1772 if (!state->new_bs->drv->supports_backing) { 1773 error_setg(errp, "The snapshot does not support backing images"); 1774 goto out; 1775 } 1776 1777 bdrv_set_aio_context(state->new_bs, aio_context); 1778 1779 /* This removes our old bs and adds the new bs. This is an operation that 1780 * can fail, so we need to do it in .prepare; undoing it for abort is 1781 * always possible. */ 1782 bdrv_ref(state->new_bs); 1783 bdrv_append(state->new_bs, state->old_bs, &local_err); 1784 if (local_err) { 1785 error_propagate(errp, local_err); 1786 goto out; 1787 } 1788 state->overlay_appended = true; 1789 1790 out: 1791 aio_context_release(aio_context); 1792 } 1793 1794 static void external_snapshot_commit(BlkActionState *common) 1795 { 1796 ExternalSnapshotState *state = 1797 DO_UPCAST(ExternalSnapshotState, common, common); 1798 AioContext *aio_context; 1799 1800 aio_context = bdrv_get_aio_context(state->old_bs); 1801 aio_context_acquire(aio_context); 1802 1803 /* We don't need (or want) to use the transactional 1804 * bdrv_reopen_multiple() across all the entries at once, because we 1805 * don't want to abort all of them if one of them fails the reopen */ 1806 if (!atomic_read(&state->old_bs->copy_on_read)) { 1807 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR, 1808 NULL); 1809 } 1810 1811 aio_context_release(aio_context); 1812 } 1813 1814 static void external_snapshot_abort(BlkActionState *common) 1815 { 1816 ExternalSnapshotState *state = 1817 DO_UPCAST(ExternalSnapshotState, common, common); 1818 if (state->new_bs) { 1819 if (state->overlay_appended) { 1820 AioContext *aio_context; 1821 1822 aio_context = bdrv_get_aio_context(state->old_bs); 1823 aio_context_acquire(aio_context); 1824 1825 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1826 close state->old_bs; we need it */ 1827 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1828 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1829 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1830 1831 aio_context_release(aio_context); 1832 } 1833 } 1834 } 1835 1836 static void external_snapshot_clean(BlkActionState *common) 1837 { 1838 ExternalSnapshotState *state = 1839 DO_UPCAST(ExternalSnapshotState, common, common); 1840 AioContext *aio_context; 1841 1842 if (!state->old_bs) { 1843 return; 1844 } 1845 1846 aio_context = bdrv_get_aio_context(state->old_bs); 1847 aio_context_acquire(aio_context); 1848 1849 bdrv_drained_end(state->old_bs); 1850 bdrv_unref(state->new_bs); 1851 1852 aio_context_release(aio_context); 1853 } 1854 1855 typedef struct DriveBackupState { 1856 BlkActionState common; 1857 BlockDriverState *bs; 1858 BlockJob *job; 1859 } DriveBackupState; 1860 1861 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn, 1862 Error **errp); 1863 1864 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1865 { 1866 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1867 BlockDriverState *bs; 1868 DriveBackup *backup; 1869 AioContext *aio_context; 1870 Error *local_err = NULL; 1871 1872 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1873 backup = common->action->u.drive_backup.data; 1874 1875 bs = qmp_get_root_bs(backup->device, errp); 1876 if (!bs) { 1877 return; 1878 } 1879 1880 aio_context = bdrv_get_aio_context(bs); 1881 aio_context_acquire(aio_context); 1882 1883 /* Paired with .clean() */ 1884 bdrv_drained_begin(bs); 1885 1886 state->bs = bs; 1887 1888 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1889 if (local_err) { 1890 error_propagate(errp, local_err); 1891 goto out; 1892 } 1893 1894 out: 1895 aio_context_release(aio_context); 1896 } 1897 1898 static void drive_backup_commit(BlkActionState *common) 1899 { 1900 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1901 AioContext *aio_context; 1902 1903 aio_context = bdrv_get_aio_context(state->bs); 1904 aio_context_acquire(aio_context); 1905 1906 assert(state->job); 1907 block_job_start(state->job); 1908 1909 aio_context_release(aio_context); 1910 } 1911 1912 static void drive_backup_abort(BlkActionState *common) 1913 { 1914 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1915 1916 if (state->job) { 1917 AioContext *aio_context; 1918 1919 aio_context = bdrv_get_aio_context(state->bs); 1920 aio_context_acquire(aio_context); 1921 1922 block_job_cancel_sync(state->job); 1923 1924 aio_context_release(aio_context); 1925 } 1926 } 1927 1928 static void drive_backup_clean(BlkActionState *common) 1929 { 1930 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1931 AioContext *aio_context; 1932 1933 if (!state->bs) { 1934 return; 1935 } 1936 1937 aio_context = bdrv_get_aio_context(state->bs); 1938 aio_context_acquire(aio_context); 1939 1940 bdrv_drained_end(state->bs); 1941 1942 aio_context_release(aio_context); 1943 } 1944 1945 typedef struct BlockdevBackupState { 1946 BlkActionState common; 1947 BlockDriverState *bs; 1948 BlockJob *job; 1949 } BlockdevBackupState; 1950 1951 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, 1952 Error **errp); 1953 1954 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1955 { 1956 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1957 BlockdevBackup *backup; 1958 BlockDriverState *bs, *target; 1959 AioContext *aio_context; 1960 Error *local_err = NULL; 1961 1962 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1963 backup = common->action->u.blockdev_backup.data; 1964 1965 bs = qmp_get_root_bs(backup->device, errp); 1966 if (!bs) { 1967 return; 1968 } 1969 1970 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1971 if (!target) { 1972 return; 1973 } 1974 1975 aio_context = bdrv_get_aio_context(bs); 1976 if (aio_context != bdrv_get_aio_context(target)) { 1977 error_setg(errp, "Backup between two IO threads is not implemented"); 1978 return; 1979 } 1980 aio_context_acquire(aio_context); 1981 state->bs = bs; 1982 1983 /* Paired with .clean() */ 1984 bdrv_drained_begin(state->bs); 1985 1986 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1987 if (local_err) { 1988 error_propagate(errp, local_err); 1989 goto out; 1990 } 1991 1992 out: 1993 aio_context_release(aio_context); 1994 } 1995 1996 static void blockdev_backup_commit(BlkActionState *common) 1997 { 1998 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1999 AioContext *aio_context; 2000 2001 aio_context = bdrv_get_aio_context(state->bs); 2002 aio_context_acquire(aio_context); 2003 2004 assert(state->job); 2005 block_job_start(state->job); 2006 2007 aio_context_release(aio_context); 2008 } 2009 2010 static void blockdev_backup_abort(BlkActionState *common) 2011 { 2012 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 2013 2014 if (state->job) { 2015 AioContext *aio_context; 2016 2017 aio_context = bdrv_get_aio_context(state->bs); 2018 aio_context_acquire(aio_context); 2019 2020 block_job_cancel_sync(state->job); 2021 2022 aio_context_release(aio_context); 2023 } 2024 } 2025 2026 static void blockdev_backup_clean(BlkActionState *common) 2027 { 2028 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 2029 AioContext *aio_context; 2030 2031 if (!state->bs) { 2032 return; 2033 } 2034 2035 aio_context = bdrv_get_aio_context(state->bs); 2036 aio_context_acquire(aio_context); 2037 2038 bdrv_drained_end(state->bs); 2039 2040 aio_context_release(aio_context); 2041 } 2042 2043 typedef struct BlockDirtyBitmapState { 2044 BlkActionState common; 2045 BdrvDirtyBitmap *bitmap; 2046 BlockDriverState *bs; 2047 HBitmap *backup; 2048 bool prepared; 2049 } BlockDirtyBitmapState; 2050 2051 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 2052 Error **errp) 2053 { 2054 Error *local_err = NULL; 2055 BlockDirtyBitmapAdd *action; 2056 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2057 common, common); 2058 2059 if (action_check_completion_mode(common, errp) < 0) { 2060 return; 2061 } 2062 2063 action = common->action->u.block_dirty_bitmap_add.data; 2064 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 2065 qmp_block_dirty_bitmap_add(action->node, action->name, 2066 action->has_granularity, action->granularity, 2067 action->has_persistent, action->persistent, 2068 action->has_autoload, action->autoload, 2069 &local_err); 2070 2071 if (!local_err) { 2072 state->prepared = true; 2073 } else { 2074 error_propagate(errp, local_err); 2075 } 2076 } 2077 2078 static void block_dirty_bitmap_add_abort(BlkActionState *common) 2079 { 2080 BlockDirtyBitmapAdd *action; 2081 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2082 common, common); 2083 2084 action = common->action->u.block_dirty_bitmap_add.data; 2085 /* Should not be able to fail: IF the bitmap was added via .prepare(), 2086 * then the node reference and bitmap name must have been valid. 2087 */ 2088 if (state->prepared) { 2089 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 2090 } 2091 } 2092 2093 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 2094 Error **errp) 2095 { 2096 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2097 common, common); 2098 BlockDirtyBitmap *action; 2099 2100 if (action_check_completion_mode(common, errp) < 0) { 2101 return; 2102 } 2103 2104 action = common->action->u.block_dirty_bitmap_clear.data; 2105 state->bitmap = block_dirty_bitmap_lookup(action->node, 2106 action->name, 2107 &state->bs, 2108 errp); 2109 if (!state->bitmap) { 2110 return; 2111 } 2112 2113 if (bdrv_dirty_bitmap_frozen(state->bitmap)) { 2114 error_setg(errp, "Cannot modify a frozen bitmap"); 2115 return; 2116 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) { 2117 error_setg(errp, "Cannot clear a disabled bitmap"); 2118 return; 2119 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) { 2120 error_setg(errp, "Cannot clear a readonly bitmap"); 2121 return; 2122 } 2123 2124 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2125 } 2126 2127 static void block_dirty_bitmap_clear_abort(BlkActionState *common) 2128 { 2129 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2130 common, common); 2131 2132 if (state->backup) { 2133 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup); 2134 } 2135 } 2136 2137 static void block_dirty_bitmap_clear_commit(BlkActionState *common) 2138 { 2139 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2140 common, common); 2141 2142 hbitmap_free(state->backup); 2143 } 2144 2145 static void abort_prepare(BlkActionState *common, Error **errp) 2146 { 2147 error_setg(errp, "Transaction aborted using Abort action"); 2148 } 2149 2150 static void abort_commit(BlkActionState *common) 2151 { 2152 g_assert_not_reached(); /* this action never succeeds */ 2153 } 2154 2155 static const BlkActionOps actions[] = { 2156 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 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_BLOCKDEV_SNAPSHOT_SYNC] = { 2164 .instance_size = sizeof(ExternalSnapshotState), 2165 .prepare = external_snapshot_prepare, 2166 .commit = external_snapshot_commit, 2167 .abort = external_snapshot_abort, 2168 .clean = external_snapshot_clean, 2169 }, 2170 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2171 .instance_size = sizeof(DriveBackupState), 2172 .prepare = drive_backup_prepare, 2173 .commit = drive_backup_commit, 2174 .abort = drive_backup_abort, 2175 .clean = drive_backup_clean, 2176 }, 2177 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2178 .instance_size = sizeof(BlockdevBackupState), 2179 .prepare = blockdev_backup_prepare, 2180 .commit = blockdev_backup_commit, 2181 .abort = blockdev_backup_abort, 2182 .clean = blockdev_backup_clean, 2183 }, 2184 [TRANSACTION_ACTION_KIND_ABORT] = { 2185 .instance_size = sizeof(BlkActionState), 2186 .prepare = abort_prepare, 2187 .commit = abort_commit, 2188 }, 2189 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2190 .instance_size = sizeof(InternalSnapshotState), 2191 .prepare = internal_snapshot_prepare, 2192 .abort = internal_snapshot_abort, 2193 .clean = internal_snapshot_clean, 2194 }, 2195 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2196 .instance_size = sizeof(BlockDirtyBitmapState), 2197 .prepare = block_dirty_bitmap_add_prepare, 2198 .abort = block_dirty_bitmap_add_abort, 2199 }, 2200 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2201 .instance_size = sizeof(BlockDirtyBitmapState), 2202 .prepare = block_dirty_bitmap_clear_prepare, 2203 .commit = block_dirty_bitmap_clear_commit, 2204 .abort = block_dirty_bitmap_clear_abort, 2205 } 2206 }; 2207 2208 /** 2209 * Allocate a TransactionProperties structure if necessary, and fill 2210 * that structure with desired defaults if they are unset. 2211 */ 2212 static TransactionProperties *get_transaction_properties( 2213 TransactionProperties *props) 2214 { 2215 if (!props) { 2216 props = g_new0(TransactionProperties, 1); 2217 } 2218 2219 if (!props->has_completion_mode) { 2220 props->has_completion_mode = true; 2221 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2222 } 2223 2224 return props; 2225 } 2226 2227 /* 2228 * 'Atomic' group operations. The operations are performed as a set, and if 2229 * any fail then we roll back all operations in the group. 2230 */ 2231 void qmp_transaction(TransactionActionList *dev_list, 2232 bool has_props, 2233 struct TransactionProperties *props, 2234 Error **errp) 2235 { 2236 TransactionActionList *dev_entry = dev_list; 2237 BlockJobTxn *block_job_txn = NULL; 2238 BlkActionState *state, *next; 2239 Error *local_err = NULL; 2240 2241 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; 2242 QSIMPLEQ_INIT(&snap_bdrv_states); 2243 2244 /* Does this transaction get canceled as a group on failure? 2245 * If not, we don't really need to make a BlockJobTxn. 2246 */ 2247 props = get_transaction_properties(props); 2248 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2249 block_job_txn = block_job_txn_new(); 2250 } 2251 2252 /* drain all i/o before any operations */ 2253 bdrv_drain_all(); 2254 2255 /* We don't do anything in this loop that commits us to the operations */ 2256 while (NULL != dev_entry) { 2257 TransactionAction *dev_info = NULL; 2258 const BlkActionOps *ops; 2259 2260 dev_info = dev_entry->value; 2261 dev_entry = dev_entry->next; 2262 2263 assert(dev_info->type < ARRAY_SIZE(actions)); 2264 2265 ops = &actions[dev_info->type]; 2266 assert(ops->instance_size > 0); 2267 2268 state = g_malloc0(ops->instance_size); 2269 state->ops = ops; 2270 state->action = dev_info; 2271 state->block_job_txn = block_job_txn; 2272 state->txn_props = props; 2273 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2274 2275 state->ops->prepare(state, &local_err); 2276 if (local_err) { 2277 error_propagate(errp, local_err); 2278 goto delete_and_fail; 2279 } 2280 } 2281 2282 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2283 if (state->ops->commit) { 2284 state->ops->commit(state); 2285 } 2286 } 2287 2288 /* success */ 2289 goto exit; 2290 2291 delete_and_fail: 2292 /* failure, and it is all-or-none; roll back all operations */ 2293 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2294 if (state->ops->abort) { 2295 state->ops->abort(state); 2296 } 2297 } 2298 exit: 2299 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2300 if (state->ops->clean) { 2301 state->ops->clean(state); 2302 } 2303 g_free(state); 2304 } 2305 if (!has_props) { 2306 qapi_free_TransactionProperties(props); 2307 } 2308 block_job_txn_unref(block_job_txn); 2309 } 2310 2311 void qmp_eject(bool has_device, const char *device, 2312 bool has_id, const char *id, 2313 bool has_force, bool force, Error **errp) 2314 { 2315 Error *local_err = NULL; 2316 int rc; 2317 2318 if (!has_force) { 2319 force = false; 2320 } 2321 2322 rc = do_open_tray(has_device ? device : NULL, 2323 has_id ? id : NULL, 2324 force, &local_err); 2325 if (rc && rc != -ENOSYS) { 2326 error_propagate(errp, local_err); 2327 return; 2328 } 2329 error_free(local_err); 2330 2331 blockdev_remove_medium(has_device, device, has_id, id, errp); 2332 } 2333 2334 void qmp_block_passwd(bool has_device, const char *device, 2335 bool has_node_name, const char *node_name, 2336 const char *password, Error **errp) 2337 { 2338 error_setg(errp, 2339 "Setting block passwords directly is no longer supported"); 2340 } 2341 2342 /* 2343 * Attempt to open the tray of @device. 2344 * If @force, ignore its tray lock. 2345 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2346 * On error, store an error through @errp and return -errno. 2347 * If @device does not exist, return -ENODEV. 2348 * If it has no removable media, return -ENOTSUP. 2349 * If it has no tray, return -ENOSYS. 2350 * If the guest was asked to open the tray, return -EINPROGRESS. 2351 * Else, return 0. 2352 */ 2353 static int do_open_tray(const char *blk_name, const char *qdev_id, 2354 bool force, Error **errp) 2355 { 2356 BlockBackend *blk; 2357 const char *device = qdev_id ?: blk_name; 2358 bool locked; 2359 2360 blk = qmp_get_blk(blk_name, qdev_id, errp); 2361 if (!blk) { 2362 return -ENODEV; 2363 } 2364 2365 if (!blk_dev_has_removable_media(blk)) { 2366 error_setg(errp, "Device '%s' is not removable", device); 2367 return -ENOTSUP; 2368 } 2369 2370 if (!blk_dev_has_tray(blk)) { 2371 error_setg(errp, "Device '%s' does not have a tray", device); 2372 return -ENOSYS; 2373 } 2374 2375 if (blk_dev_is_tray_open(blk)) { 2376 return 0; 2377 } 2378 2379 locked = blk_dev_is_medium_locked(blk); 2380 if (locked) { 2381 blk_dev_eject_request(blk, force); 2382 } 2383 2384 if (!locked || force) { 2385 blk_dev_change_media_cb(blk, false, &error_abort); 2386 } 2387 2388 if (locked && !force) { 2389 error_setg(errp, "Device '%s' is locked and force was not specified, " 2390 "wait for tray to open and try again", device); 2391 return -EINPROGRESS; 2392 } 2393 2394 return 0; 2395 } 2396 2397 void qmp_blockdev_open_tray(bool has_device, const char *device, 2398 bool has_id, const char *id, 2399 bool has_force, bool force, 2400 Error **errp) 2401 { 2402 Error *local_err = NULL; 2403 int rc; 2404 2405 if (!has_force) { 2406 force = false; 2407 } 2408 rc = do_open_tray(has_device ? device : NULL, 2409 has_id ? id : NULL, 2410 force, &local_err); 2411 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2412 error_propagate(errp, local_err); 2413 return; 2414 } 2415 error_free(local_err); 2416 } 2417 2418 void qmp_blockdev_close_tray(bool has_device, const char *device, 2419 bool has_id, const char *id, 2420 Error **errp) 2421 { 2422 BlockBackend *blk; 2423 Error *local_err = NULL; 2424 2425 device = has_device ? device : NULL; 2426 id = has_id ? id : NULL; 2427 2428 blk = qmp_get_blk(device, id, errp); 2429 if (!blk) { 2430 return; 2431 } 2432 2433 if (!blk_dev_has_removable_media(blk)) { 2434 error_setg(errp, "Device '%s' is not removable", device ?: id); 2435 return; 2436 } 2437 2438 if (!blk_dev_has_tray(blk)) { 2439 /* Ignore this command on tray-less devices */ 2440 return; 2441 } 2442 2443 if (!blk_dev_is_tray_open(blk)) { 2444 return; 2445 } 2446 2447 blk_dev_change_media_cb(blk, true, &local_err); 2448 if (local_err) { 2449 error_propagate(errp, local_err); 2450 return; 2451 } 2452 } 2453 2454 static void blockdev_remove_medium(bool has_device, const char *device, 2455 bool has_id, const char *id, Error **errp) 2456 { 2457 BlockBackend *blk; 2458 BlockDriverState *bs; 2459 AioContext *aio_context; 2460 bool has_attached_device; 2461 2462 device = has_device ? device : NULL; 2463 id = has_id ? id : NULL; 2464 2465 blk = qmp_get_blk(device, id, errp); 2466 if (!blk) { 2467 return; 2468 } 2469 2470 /* For BBs without a device, we can exchange the BDS tree at will */ 2471 has_attached_device = blk_get_attached_dev(blk); 2472 2473 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2474 error_setg(errp, "Device '%s' is not removable", device ?: id); 2475 return; 2476 } 2477 2478 if (has_attached_device && blk_dev_has_tray(blk) && 2479 !blk_dev_is_tray_open(blk)) 2480 { 2481 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2482 return; 2483 } 2484 2485 bs = blk_bs(blk); 2486 if (!bs) { 2487 return; 2488 } 2489 2490 aio_context = bdrv_get_aio_context(bs); 2491 aio_context_acquire(aio_context); 2492 2493 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2494 goto out; 2495 } 2496 2497 blk_remove_bs(blk); 2498 2499 if (!blk_dev_has_tray(blk)) { 2500 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2501 * called at all); therefore, the medium needs to be ejected here. 2502 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2503 * value passed here (i.e. false). */ 2504 blk_dev_change_media_cb(blk, false, &error_abort); 2505 } 2506 2507 out: 2508 aio_context_release(aio_context); 2509 } 2510 2511 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2512 { 2513 blockdev_remove_medium(false, NULL, true, id, errp); 2514 } 2515 2516 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2517 BlockDriverState *bs, Error **errp) 2518 { 2519 Error *local_err = NULL; 2520 bool has_device; 2521 int ret; 2522 2523 /* For BBs without a device, we can exchange the BDS tree at will */ 2524 has_device = blk_get_attached_dev(blk); 2525 2526 if (has_device && !blk_dev_has_removable_media(blk)) { 2527 error_setg(errp, "Device is not removable"); 2528 return; 2529 } 2530 2531 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2532 error_setg(errp, "Tray of the device is not open"); 2533 return; 2534 } 2535 2536 if (blk_bs(blk)) { 2537 error_setg(errp, "There already is a medium in the device"); 2538 return; 2539 } 2540 2541 ret = blk_insert_bs(blk, bs, errp); 2542 if (ret < 0) { 2543 return; 2544 } 2545 2546 if (!blk_dev_has_tray(blk)) { 2547 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2548 * called at all); therefore, the medium needs to be pushed into the 2549 * slot here. 2550 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2551 * value passed here (i.e. true). */ 2552 blk_dev_change_media_cb(blk, true, &local_err); 2553 if (local_err) { 2554 error_propagate(errp, local_err); 2555 blk_remove_bs(blk); 2556 return; 2557 } 2558 } 2559 } 2560 2561 static void blockdev_insert_medium(bool has_device, const char *device, 2562 bool has_id, const char *id, 2563 const char *node_name, Error **errp) 2564 { 2565 BlockBackend *blk; 2566 BlockDriverState *bs; 2567 2568 blk = qmp_get_blk(has_device ? device : NULL, 2569 has_id ? id : NULL, 2570 errp); 2571 if (!blk) { 2572 return; 2573 } 2574 2575 bs = bdrv_find_node(node_name); 2576 if (!bs) { 2577 error_setg(errp, "Node '%s' not found", node_name); 2578 return; 2579 } 2580 2581 if (bdrv_has_blk(bs)) { 2582 error_setg(errp, "Node '%s' is already in use", node_name); 2583 return; 2584 } 2585 2586 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2587 } 2588 2589 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2590 Error **errp) 2591 { 2592 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2593 } 2594 2595 void qmp_blockdev_change_medium(bool has_device, const char *device, 2596 bool has_id, const char *id, 2597 const char *filename, 2598 bool has_format, const char *format, 2599 bool has_read_only, 2600 BlockdevChangeReadOnlyMode read_only, 2601 Error **errp) 2602 { 2603 BlockBackend *blk; 2604 BlockDriverState *medium_bs = NULL; 2605 int bdrv_flags; 2606 bool detect_zeroes; 2607 int rc; 2608 QDict *options = NULL; 2609 Error *err = NULL; 2610 2611 blk = qmp_get_blk(has_device ? device : NULL, 2612 has_id ? id : NULL, 2613 errp); 2614 if (!blk) { 2615 goto fail; 2616 } 2617 2618 if (blk_bs(blk)) { 2619 blk_update_root_state(blk); 2620 } 2621 2622 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2623 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2624 BDRV_O_PROTOCOL); 2625 2626 if (!has_read_only) { 2627 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2628 } 2629 2630 switch (read_only) { 2631 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2632 break; 2633 2634 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2635 bdrv_flags &= ~BDRV_O_RDWR; 2636 break; 2637 2638 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2639 bdrv_flags |= BDRV_O_RDWR; 2640 break; 2641 2642 default: 2643 abort(); 2644 } 2645 2646 options = qdict_new(); 2647 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2648 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2649 2650 if (has_format) { 2651 qdict_put_str(options, "driver", format); 2652 } 2653 2654 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2655 if (!medium_bs) { 2656 goto fail; 2657 } 2658 2659 rc = do_open_tray(has_device ? device : NULL, 2660 has_id ? id : NULL, 2661 false, &err); 2662 if (rc && rc != -ENOSYS) { 2663 error_propagate(errp, err); 2664 goto fail; 2665 } 2666 error_free(err); 2667 err = NULL; 2668 2669 blockdev_remove_medium(has_device, device, has_id, id, &err); 2670 if (err) { 2671 error_propagate(errp, err); 2672 goto fail; 2673 } 2674 2675 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2676 if (err) { 2677 error_propagate(errp, err); 2678 goto fail; 2679 } 2680 2681 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2682 2683 fail: 2684 /* If the medium has been inserted, the device has its own reference, so 2685 * ours must be relinquished; and if it has not been inserted successfully, 2686 * the reference must be relinquished anyway */ 2687 bdrv_unref(medium_bs); 2688 } 2689 2690 /* throttling disk I/O limits */ 2691 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2692 { 2693 ThrottleConfig cfg; 2694 BlockDriverState *bs; 2695 BlockBackend *blk; 2696 AioContext *aio_context; 2697 2698 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2699 arg->has_id ? arg->id : NULL, 2700 errp); 2701 if (!blk) { 2702 return; 2703 } 2704 2705 aio_context = blk_get_aio_context(blk); 2706 aio_context_acquire(aio_context); 2707 2708 bs = blk_bs(blk); 2709 if (!bs) { 2710 error_setg(errp, "Device has no medium"); 2711 goto out; 2712 } 2713 2714 throttle_config_init(&cfg); 2715 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2716 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2717 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2718 2719 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2720 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2721 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2722 2723 if (arg->has_bps_max) { 2724 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2725 } 2726 if (arg->has_bps_rd_max) { 2727 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2728 } 2729 if (arg->has_bps_wr_max) { 2730 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2731 } 2732 if (arg->has_iops_max) { 2733 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2734 } 2735 if (arg->has_iops_rd_max) { 2736 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2737 } 2738 if (arg->has_iops_wr_max) { 2739 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2740 } 2741 2742 if (arg->has_bps_max_length) { 2743 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2744 } 2745 if (arg->has_bps_rd_max_length) { 2746 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2747 } 2748 if (arg->has_bps_wr_max_length) { 2749 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2750 } 2751 if (arg->has_iops_max_length) { 2752 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2753 } 2754 if (arg->has_iops_rd_max_length) { 2755 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2756 } 2757 if (arg->has_iops_wr_max_length) { 2758 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2759 } 2760 2761 if (arg->has_iops_size) { 2762 cfg.op_size = arg->iops_size; 2763 } 2764 2765 if (!throttle_is_valid(&cfg, errp)) { 2766 goto out; 2767 } 2768 2769 if (throttle_enabled(&cfg)) { 2770 /* Enable I/O limits if they're not enabled yet, otherwise 2771 * just update the throttling group. */ 2772 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2773 blk_io_limits_enable(blk, 2774 arg->has_group ? arg->group : 2775 arg->has_device ? arg->device : 2776 arg->id); 2777 } else if (arg->has_group) { 2778 blk_io_limits_update_group(blk, arg->group); 2779 } 2780 /* Set the new throttling configuration */ 2781 blk_set_io_limits(blk, &cfg); 2782 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2783 /* If all throttling settings are set to 0, disable I/O limits */ 2784 blk_io_limits_disable(blk); 2785 } 2786 2787 out: 2788 aio_context_release(aio_context); 2789 } 2790 2791 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2792 bool has_granularity, uint32_t granularity, 2793 bool has_persistent, bool persistent, 2794 bool has_autoload, bool autoload, 2795 Error **errp) 2796 { 2797 BlockDriverState *bs; 2798 BdrvDirtyBitmap *bitmap; 2799 2800 if (!name || name[0] == '\0') { 2801 error_setg(errp, "Bitmap name cannot be empty"); 2802 return; 2803 } 2804 2805 bs = bdrv_lookup_bs(node, node, errp); 2806 if (!bs) { 2807 return; 2808 } 2809 2810 if (has_granularity) { 2811 if (granularity < 512 || !is_power_of_2(granularity)) { 2812 error_setg(errp, "Granularity must be power of 2 " 2813 "and at least 512"); 2814 return; 2815 } 2816 } else { 2817 /* Default to cluster size, if available: */ 2818 granularity = bdrv_get_default_bitmap_granularity(bs); 2819 } 2820 2821 if (!has_persistent) { 2822 persistent = false; 2823 } 2824 if (!has_autoload) { 2825 autoload = false; 2826 } 2827 2828 if (has_autoload && !persistent) { 2829 error_setg(errp, "Autoload flag must be used only for persistent " 2830 "bitmaps"); 2831 return; 2832 } 2833 2834 if (persistent && 2835 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) 2836 { 2837 return; 2838 } 2839 2840 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2841 if (bitmap == NULL) { 2842 return; 2843 } 2844 2845 bdrv_dirty_bitmap_set_persistance(bitmap, persistent); 2846 bdrv_dirty_bitmap_set_autoload(bitmap, autoload); 2847 } 2848 2849 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2850 Error **errp) 2851 { 2852 BlockDriverState *bs; 2853 BdrvDirtyBitmap *bitmap; 2854 Error *local_err = NULL; 2855 2856 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2857 if (!bitmap || !bs) { 2858 return; 2859 } 2860 2861 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2862 error_setg(errp, 2863 "Bitmap '%s' is currently frozen and cannot be removed", 2864 name); 2865 return; 2866 } 2867 2868 if (bdrv_dirty_bitmap_get_persistance(bitmap)) { 2869 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2870 if (local_err != NULL) { 2871 error_propagate(errp, local_err); 2872 return; 2873 } 2874 } 2875 2876 bdrv_dirty_bitmap_make_anon(bitmap); 2877 bdrv_release_dirty_bitmap(bs, bitmap); 2878 } 2879 2880 /** 2881 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2882 * immediately after a full backup operation. 2883 */ 2884 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2885 Error **errp) 2886 { 2887 BdrvDirtyBitmap *bitmap; 2888 BlockDriverState *bs; 2889 2890 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2891 if (!bitmap || !bs) { 2892 return; 2893 } 2894 2895 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2896 error_setg(errp, 2897 "Bitmap '%s' is currently frozen and cannot be modified", 2898 name); 2899 return; 2900 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2901 error_setg(errp, 2902 "Bitmap '%s' is currently disabled and cannot be cleared", 2903 name); 2904 return; 2905 } else if (bdrv_dirty_bitmap_readonly(bitmap)) { 2906 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name); 2907 return; 2908 } 2909 2910 bdrv_clear_dirty_bitmap(bitmap, NULL); 2911 } 2912 2913 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2914 const char *name, 2915 Error **errp) 2916 { 2917 BdrvDirtyBitmap *bitmap; 2918 BlockDriverState *bs; 2919 BlockDirtyBitmapSha256 *ret = NULL; 2920 char *sha256; 2921 2922 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2923 if (!bitmap || !bs) { 2924 return NULL; 2925 } 2926 2927 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2928 if (sha256 == NULL) { 2929 return NULL; 2930 } 2931 2932 ret = g_new(BlockDirtyBitmapSha256, 1); 2933 ret->sha256 = sha256; 2934 2935 return ret; 2936 } 2937 2938 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2939 { 2940 const char *id = qdict_get_str(qdict, "id"); 2941 BlockBackend *blk; 2942 BlockDriverState *bs; 2943 AioContext *aio_context; 2944 Error *local_err = NULL; 2945 2946 bs = bdrv_find_node(id); 2947 if (bs) { 2948 qmp_blockdev_del(id, &local_err); 2949 if (local_err) { 2950 error_report_err(local_err); 2951 } 2952 return; 2953 } 2954 2955 blk = blk_by_name(id); 2956 if (!blk) { 2957 error_report("Device '%s' not found", id); 2958 return; 2959 } 2960 2961 if (!blk_legacy_dinfo(blk)) { 2962 error_report("Deleting device added with blockdev-add" 2963 " is not supported"); 2964 return; 2965 } 2966 2967 aio_context = blk_get_aio_context(blk); 2968 aio_context_acquire(aio_context); 2969 2970 bs = blk_bs(blk); 2971 if (bs) { 2972 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2973 error_report_err(local_err); 2974 aio_context_release(aio_context); 2975 return; 2976 } 2977 2978 blk_remove_bs(blk); 2979 } 2980 2981 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 2982 monitor_remove_blk(blk); 2983 2984 /* If this BlockBackend has a device attached to it, its refcount will be 2985 * decremented when the device is removed; otherwise we have to do so here. 2986 */ 2987 if (blk_get_attached_dev(blk)) { 2988 /* Further I/O must not pause the guest */ 2989 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 2990 BLOCKDEV_ON_ERROR_REPORT); 2991 } else { 2992 blk_unref(blk); 2993 } 2994 2995 aio_context_release(aio_context); 2996 } 2997 2998 void qmp_block_resize(bool has_device, const char *device, 2999 bool has_node_name, const char *node_name, 3000 int64_t size, Error **errp) 3001 { 3002 Error *local_err = NULL; 3003 BlockBackend *blk = NULL; 3004 BlockDriverState *bs; 3005 AioContext *aio_context; 3006 int ret; 3007 3008 bs = bdrv_lookup_bs(has_device ? device : NULL, 3009 has_node_name ? node_name : NULL, 3010 &local_err); 3011 if (local_err) { 3012 error_propagate(errp, local_err); 3013 return; 3014 } 3015 3016 aio_context = bdrv_get_aio_context(bs); 3017 aio_context_acquire(aio_context); 3018 3019 if (!bdrv_is_first_non_filter(bs)) { 3020 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3021 goto out; 3022 } 3023 3024 if (size < 0) { 3025 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3026 goto out; 3027 } 3028 3029 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3030 error_setg(errp, QERR_DEVICE_IN_USE, device); 3031 goto out; 3032 } 3033 3034 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3035 ret = blk_insert_bs(blk, bs, errp); 3036 if (ret < 0) { 3037 goto out; 3038 } 3039 3040 bdrv_drained_begin(bs); 3041 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3042 bdrv_drained_end(bs); 3043 3044 out: 3045 blk_unref(blk); 3046 aio_context_release(aio_context); 3047 } 3048 3049 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3050 bool has_base, const char *base, 3051 bool has_base_node, const char *base_node, 3052 bool has_backing_file, const char *backing_file, 3053 bool has_speed, int64_t speed, 3054 bool has_on_error, BlockdevOnError on_error, 3055 Error **errp) 3056 { 3057 BlockDriverState *bs, *iter; 3058 BlockDriverState *base_bs = NULL; 3059 AioContext *aio_context; 3060 Error *local_err = NULL; 3061 const char *base_name = NULL; 3062 3063 if (!has_on_error) { 3064 on_error = BLOCKDEV_ON_ERROR_REPORT; 3065 } 3066 3067 bs = bdrv_lookup_bs(device, device, errp); 3068 if (!bs) { 3069 return; 3070 } 3071 3072 aio_context = bdrv_get_aio_context(bs); 3073 aio_context_acquire(aio_context); 3074 3075 if (has_base && has_base_node) { 3076 error_setg(errp, "'base' and 'base-node' cannot be specified " 3077 "at the same time"); 3078 goto out; 3079 } 3080 3081 if (has_base) { 3082 base_bs = bdrv_find_backing_image(bs, base); 3083 if (base_bs == NULL) { 3084 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3085 goto out; 3086 } 3087 assert(bdrv_get_aio_context(base_bs) == aio_context); 3088 base_name = base; 3089 } 3090 3091 if (has_base_node) { 3092 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3093 if (!base_bs) { 3094 goto out; 3095 } 3096 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3097 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3098 base_node, device); 3099 goto out; 3100 } 3101 assert(bdrv_get_aio_context(base_bs) == aio_context); 3102 base_name = base_bs->filename; 3103 } 3104 3105 /* Check for op blockers in the whole chain between bs and base */ 3106 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3107 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3108 goto out; 3109 } 3110 } 3111 3112 /* if we are streaming the entire chain, the result will have no backing 3113 * file, and specifying one is therefore an error */ 3114 if (base_bs == NULL && has_backing_file) { 3115 error_setg(errp, "backing file specified, but streaming the " 3116 "entire chain"); 3117 goto out; 3118 } 3119 3120 /* backing_file string overrides base bs filename */ 3121 base_name = has_backing_file ? backing_file : base_name; 3122 3123 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3124 has_speed ? speed : 0, on_error, &local_err); 3125 if (local_err) { 3126 error_propagate(errp, local_err); 3127 goto out; 3128 } 3129 3130 trace_qmp_block_stream(bs, bs->job); 3131 3132 out: 3133 aio_context_release(aio_context); 3134 } 3135 3136 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3137 bool has_base, const char *base, 3138 bool has_top, const char *top, 3139 bool has_backing_file, const char *backing_file, 3140 bool has_speed, int64_t speed, 3141 bool has_filter_node_name, const char *filter_node_name, 3142 Error **errp) 3143 { 3144 BlockDriverState *bs; 3145 BlockDriverState *iter; 3146 BlockDriverState *base_bs, *top_bs; 3147 AioContext *aio_context; 3148 Error *local_err = NULL; 3149 /* This will be part of the QMP command, if/when the 3150 * BlockdevOnError change for blkmirror makes it in 3151 */ 3152 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3153 3154 if (!has_speed) { 3155 speed = 0; 3156 } 3157 if (!has_filter_node_name) { 3158 filter_node_name = NULL; 3159 } 3160 3161 /* Important Note: 3162 * libvirt relies on the DeviceNotFound error class in order to probe for 3163 * live commit feature versions; for this to work, we must make sure to 3164 * perform the device lookup before any generic errors that may occur in a 3165 * scenario in which all optional arguments are omitted. */ 3166 bs = qmp_get_root_bs(device, &local_err); 3167 if (!bs) { 3168 bs = bdrv_lookup_bs(device, device, NULL); 3169 if (!bs) { 3170 error_free(local_err); 3171 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3172 "Device '%s' not found", device); 3173 } else { 3174 error_propagate(errp, local_err); 3175 } 3176 return; 3177 } 3178 3179 aio_context = bdrv_get_aio_context(bs); 3180 aio_context_acquire(aio_context); 3181 3182 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3183 goto out; 3184 } 3185 3186 /* default top_bs is the active layer */ 3187 top_bs = bs; 3188 3189 if (has_top && top) { 3190 if (strcmp(bs->filename, top) != 0) { 3191 top_bs = bdrv_find_backing_image(bs, top); 3192 } 3193 } 3194 3195 if (top_bs == NULL) { 3196 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3197 goto out; 3198 } 3199 3200 assert(bdrv_get_aio_context(top_bs) == aio_context); 3201 3202 if (has_base && base) { 3203 base_bs = bdrv_find_backing_image(top_bs, base); 3204 } else { 3205 base_bs = bdrv_find_base(top_bs); 3206 } 3207 3208 if (base_bs == NULL) { 3209 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3210 goto out; 3211 } 3212 3213 assert(bdrv_get_aio_context(base_bs) == aio_context); 3214 3215 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3216 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3217 goto out; 3218 } 3219 } 3220 3221 /* Do not allow attempts to commit an image into itself */ 3222 if (top_bs == base_bs) { 3223 error_setg(errp, "cannot commit an image into itself"); 3224 goto out; 3225 } 3226 3227 if (top_bs == bs) { 3228 if (has_backing_file) { 3229 error_setg(errp, "'backing-file' specified," 3230 " but 'top' is the active layer"); 3231 goto out; 3232 } 3233 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3234 BLOCK_JOB_DEFAULT, speed, on_error, 3235 filter_node_name, NULL, NULL, false, &local_err); 3236 } else { 3237 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3238 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3239 goto out; 3240 } 3241 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed, 3242 on_error, has_backing_file ? backing_file : NULL, 3243 filter_node_name, &local_err); 3244 } 3245 if (local_err != NULL) { 3246 error_propagate(errp, local_err); 3247 goto out; 3248 } 3249 3250 out: 3251 aio_context_release(aio_context); 3252 } 3253 3254 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn, 3255 Error **errp) 3256 { 3257 BlockDriverState *bs; 3258 BlockDriverState *target_bs; 3259 BlockDriverState *source = NULL; 3260 BlockJob *job = NULL; 3261 BdrvDirtyBitmap *bmap = NULL; 3262 AioContext *aio_context; 3263 QDict *options = NULL; 3264 Error *local_err = NULL; 3265 int flags; 3266 int64_t size; 3267 bool set_backing_hd = false; 3268 3269 if (!backup->has_speed) { 3270 backup->speed = 0; 3271 } 3272 if (!backup->has_on_source_error) { 3273 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3274 } 3275 if (!backup->has_on_target_error) { 3276 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3277 } 3278 if (!backup->has_mode) { 3279 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3280 } 3281 if (!backup->has_job_id) { 3282 backup->job_id = NULL; 3283 } 3284 if (!backup->has_compress) { 3285 backup->compress = false; 3286 } 3287 3288 bs = qmp_get_root_bs(backup->device, errp); 3289 if (!bs) { 3290 return NULL; 3291 } 3292 3293 aio_context = bdrv_get_aio_context(bs); 3294 aio_context_acquire(aio_context); 3295 3296 if (!backup->has_format) { 3297 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3298 NULL : (char*) bs->drv->format_name; 3299 } 3300 3301 /* Early check to avoid creating target */ 3302 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3303 goto out; 3304 } 3305 3306 flags = bs->open_flags | BDRV_O_RDWR; 3307 3308 /* See if we have a backing HD we can use to create our new image 3309 * on top of. */ 3310 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3311 source = backing_bs(bs); 3312 if (!source) { 3313 backup->sync = MIRROR_SYNC_MODE_FULL; 3314 } 3315 } 3316 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3317 source = bs; 3318 flags |= BDRV_O_NO_BACKING; 3319 set_backing_hd = true; 3320 } 3321 3322 size = bdrv_getlength(bs); 3323 if (size < 0) { 3324 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3325 goto out; 3326 } 3327 3328 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3329 assert(backup->format); 3330 if (source) { 3331 bdrv_img_create(backup->target, backup->format, source->filename, 3332 source->drv->format_name, NULL, 3333 size, flags, false, &local_err); 3334 } else { 3335 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3336 size, flags, false, &local_err); 3337 } 3338 } 3339 3340 if (local_err) { 3341 error_propagate(errp, local_err); 3342 goto out; 3343 } 3344 3345 if (backup->format) { 3346 if (!options) { 3347 options = qdict_new(); 3348 } 3349 qdict_put_str(options, "driver", backup->format); 3350 } 3351 3352 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3353 if (!target_bs) { 3354 goto out; 3355 } 3356 3357 bdrv_set_aio_context(target_bs, aio_context); 3358 3359 if (set_backing_hd) { 3360 bdrv_set_backing_hd(target_bs, source, &local_err); 3361 if (local_err) { 3362 bdrv_unref(target_bs); 3363 goto out; 3364 } 3365 } 3366 3367 if (backup->has_bitmap) { 3368 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3369 if (!bmap) { 3370 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3371 bdrv_unref(target_bs); 3372 goto out; 3373 } 3374 } 3375 3376 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3377 backup->sync, bmap, backup->compress, 3378 backup->on_source_error, backup->on_target_error, 3379 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err); 3380 bdrv_unref(target_bs); 3381 if (local_err != NULL) { 3382 error_propagate(errp, local_err); 3383 goto out; 3384 } 3385 3386 out: 3387 aio_context_release(aio_context); 3388 return job; 3389 } 3390 3391 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3392 { 3393 3394 BlockJob *job; 3395 job = do_drive_backup(arg, NULL, errp); 3396 if (job) { 3397 block_job_start(job); 3398 } 3399 } 3400 3401 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3402 { 3403 return bdrv_named_nodes_list(errp); 3404 } 3405 3406 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, 3407 Error **errp) 3408 { 3409 BlockDriverState *bs; 3410 BlockDriverState *target_bs; 3411 Error *local_err = NULL; 3412 AioContext *aio_context; 3413 BlockJob *job = NULL; 3414 3415 if (!backup->has_speed) { 3416 backup->speed = 0; 3417 } 3418 if (!backup->has_on_source_error) { 3419 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3420 } 3421 if (!backup->has_on_target_error) { 3422 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3423 } 3424 if (!backup->has_job_id) { 3425 backup->job_id = NULL; 3426 } 3427 if (!backup->has_compress) { 3428 backup->compress = false; 3429 } 3430 3431 bs = qmp_get_root_bs(backup->device, errp); 3432 if (!bs) { 3433 return NULL; 3434 } 3435 3436 aio_context = bdrv_get_aio_context(bs); 3437 aio_context_acquire(aio_context); 3438 3439 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3440 if (!target_bs) { 3441 goto out; 3442 } 3443 3444 if (bdrv_get_aio_context(target_bs) != aio_context) { 3445 if (!bdrv_has_blk(target_bs)) { 3446 /* The target BDS is not attached, we can safely move it to another 3447 * AioContext. */ 3448 bdrv_set_aio_context(target_bs, aio_context); 3449 } else { 3450 error_setg(errp, "Target is attached to a different thread from " 3451 "source."); 3452 goto out; 3453 } 3454 } 3455 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3456 backup->sync, NULL, backup->compress, 3457 backup->on_source_error, backup->on_target_error, 3458 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err); 3459 if (local_err != NULL) { 3460 error_propagate(errp, local_err); 3461 } 3462 out: 3463 aio_context_release(aio_context); 3464 return job; 3465 } 3466 3467 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3468 { 3469 BlockJob *job; 3470 job = do_blockdev_backup(arg, NULL, errp); 3471 if (job) { 3472 block_job_start(job); 3473 } 3474 } 3475 3476 /* Parameter check and block job starting for drive mirroring. 3477 * Caller should hold @device and @target's aio context (must be the same). 3478 **/ 3479 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3480 BlockDriverState *target, 3481 bool has_replaces, const char *replaces, 3482 enum MirrorSyncMode sync, 3483 BlockMirrorBackingMode backing_mode, 3484 bool has_speed, int64_t speed, 3485 bool has_granularity, uint32_t granularity, 3486 bool has_buf_size, int64_t buf_size, 3487 bool has_on_source_error, 3488 BlockdevOnError on_source_error, 3489 bool has_on_target_error, 3490 BlockdevOnError on_target_error, 3491 bool has_unmap, bool unmap, 3492 bool has_filter_node_name, 3493 const char *filter_node_name, 3494 Error **errp) 3495 { 3496 3497 if (!has_speed) { 3498 speed = 0; 3499 } 3500 if (!has_on_source_error) { 3501 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3502 } 3503 if (!has_on_target_error) { 3504 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3505 } 3506 if (!has_granularity) { 3507 granularity = 0; 3508 } 3509 if (!has_buf_size) { 3510 buf_size = 0; 3511 } 3512 if (!has_unmap) { 3513 unmap = true; 3514 } 3515 if (!has_filter_node_name) { 3516 filter_node_name = NULL; 3517 } 3518 3519 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3520 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3521 "a value in range [512B, 64MB]"); 3522 return; 3523 } 3524 if (granularity & (granularity - 1)) { 3525 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3526 "power of 2"); 3527 return; 3528 } 3529 3530 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3531 return; 3532 } 3533 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3534 return; 3535 } 3536 3537 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3538 sync = MIRROR_SYNC_MODE_FULL; 3539 } 3540 3541 /* pass the node name to replace to mirror start since it's loose coupling 3542 * and will allow to check whether the node still exist at mirror completion 3543 */ 3544 mirror_start(job_id, bs, target, 3545 has_replaces ? replaces : NULL, 3546 speed, granularity, buf_size, sync, backing_mode, 3547 on_source_error, on_target_error, unmap, filter_node_name, 3548 errp); 3549 } 3550 3551 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3552 { 3553 BlockDriverState *bs; 3554 BlockDriverState *source, *target_bs; 3555 AioContext *aio_context; 3556 BlockMirrorBackingMode backing_mode; 3557 Error *local_err = NULL; 3558 QDict *options = NULL; 3559 int flags; 3560 int64_t size; 3561 const char *format = arg->format; 3562 3563 bs = qmp_get_root_bs(arg->device, errp); 3564 if (!bs) { 3565 return; 3566 } 3567 3568 aio_context = bdrv_get_aio_context(bs); 3569 aio_context_acquire(aio_context); 3570 3571 if (!arg->has_mode) { 3572 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3573 } 3574 3575 if (!arg->has_format) { 3576 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3577 ? NULL : bs->drv->format_name); 3578 } 3579 3580 flags = bs->open_flags | BDRV_O_RDWR; 3581 source = backing_bs(bs); 3582 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3583 arg->sync = MIRROR_SYNC_MODE_FULL; 3584 } 3585 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3586 source = bs; 3587 } 3588 3589 size = bdrv_getlength(bs); 3590 if (size < 0) { 3591 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3592 goto out; 3593 } 3594 3595 if (arg->has_replaces) { 3596 BlockDriverState *to_replace_bs; 3597 AioContext *replace_aio_context; 3598 int64_t replace_size; 3599 3600 if (!arg->has_node_name) { 3601 error_setg(errp, "a node-name must be provided when replacing a" 3602 " named node of the graph"); 3603 goto out; 3604 } 3605 3606 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err); 3607 3608 if (!to_replace_bs) { 3609 error_propagate(errp, local_err); 3610 goto out; 3611 } 3612 3613 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3614 aio_context_acquire(replace_aio_context); 3615 replace_size = bdrv_getlength(to_replace_bs); 3616 aio_context_release(replace_aio_context); 3617 3618 if (size != replace_size) { 3619 error_setg(errp, "cannot replace image with a mirror image of " 3620 "different size"); 3621 goto out; 3622 } 3623 } 3624 3625 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3626 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3627 } else { 3628 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3629 } 3630 3631 /* Don't open backing image in create() */ 3632 flags |= BDRV_O_NO_BACKING; 3633 3634 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3635 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3636 { 3637 /* create new image w/o backing file */ 3638 assert(format); 3639 bdrv_img_create(arg->target, format, 3640 NULL, NULL, NULL, size, flags, false, &local_err); 3641 } else { 3642 switch (arg->mode) { 3643 case NEW_IMAGE_MODE_EXISTING: 3644 break; 3645 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3646 /* create new image with backing file */ 3647 bdrv_img_create(arg->target, format, 3648 source->filename, 3649 source->drv->format_name, 3650 NULL, size, flags, false, &local_err); 3651 break; 3652 default: 3653 abort(); 3654 } 3655 } 3656 3657 if (local_err) { 3658 error_propagate(errp, local_err); 3659 goto out; 3660 } 3661 3662 options = qdict_new(); 3663 if (arg->has_node_name) { 3664 qdict_put_str(options, "node-name", arg->node_name); 3665 } 3666 if (format) { 3667 qdict_put_str(options, "driver", format); 3668 } 3669 3670 /* Mirroring takes care of copy-on-write using the source's backing 3671 * file. 3672 */ 3673 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3674 if (!target_bs) { 3675 goto out; 3676 } 3677 3678 bdrv_set_aio_context(target_bs, aio_context); 3679 3680 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3681 arg->has_replaces, arg->replaces, arg->sync, 3682 backing_mode, arg->has_speed, arg->speed, 3683 arg->has_granularity, arg->granularity, 3684 arg->has_buf_size, arg->buf_size, 3685 arg->has_on_source_error, arg->on_source_error, 3686 arg->has_on_target_error, arg->on_target_error, 3687 arg->has_unmap, arg->unmap, 3688 false, NULL, 3689 &local_err); 3690 bdrv_unref(target_bs); 3691 error_propagate(errp, local_err); 3692 out: 3693 aio_context_release(aio_context); 3694 } 3695 3696 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3697 const char *device, const char *target, 3698 bool has_replaces, const char *replaces, 3699 MirrorSyncMode sync, 3700 bool has_speed, int64_t speed, 3701 bool has_granularity, uint32_t granularity, 3702 bool has_buf_size, int64_t buf_size, 3703 bool has_on_source_error, 3704 BlockdevOnError on_source_error, 3705 bool has_on_target_error, 3706 BlockdevOnError on_target_error, 3707 bool has_filter_node_name, 3708 const char *filter_node_name, 3709 Error **errp) 3710 { 3711 BlockDriverState *bs; 3712 BlockDriverState *target_bs; 3713 AioContext *aio_context; 3714 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3715 Error *local_err = NULL; 3716 3717 bs = qmp_get_root_bs(device, errp); 3718 if (!bs) { 3719 return; 3720 } 3721 3722 target_bs = bdrv_lookup_bs(target, target, errp); 3723 if (!target_bs) { 3724 return; 3725 } 3726 3727 aio_context = bdrv_get_aio_context(bs); 3728 aio_context_acquire(aio_context); 3729 3730 bdrv_set_aio_context(target_bs, aio_context); 3731 3732 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3733 has_replaces, replaces, sync, backing_mode, 3734 has_speed, speed, 3735 has_granularity, granularity, 3736 has_buf_size, buf_size, 3737 has_on_source_error, on_source_error, 3738 has_on_target_error, on_target_error, 3739 true, true, 3740 has_filter_node_name, filter_node_name, 3741 &local_err); 3742 error_propagate(errp, local_err); 3743 3744 aio_context_release(aio_context); 3745 } 3746 3747 /* Get a block job using its ID and acquire its AioContext */ 3748 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3749 Error **errp) 3750 { 3751 BlockJob *job; 3752 3753 assert(id != NULL); 3754 3755 *aio_context = NULL; 3756 3757 job = block_job_get(id); 3758 3759 if (!job) { 3760 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3761 "Block job '%s' not found", id); 3762 return NULL; 3763 } 3764 3765 *aio_context = blk_get_aio_context(job->blk); 3766 aio_context_acquire(*aio_context); 3767 3768 return job; 3769 } 3770 3771 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3772 { 3773 AioContext *aio_context; 3774 BlockJob *job = find_block_job(device, &aio_context, errp); 3775 3776 if (!job) { 3777 return; 3778 } 3779 3780 block_job_set_speed(job, speed, errp); 3781 aio_context_release(aio_context); 3782 } 3783 3784 void qmp_block_job_cancel(const char *device, 3785 bool has_force, bool force, Error **errp) 3786 { 3787 AioContext *aio_context; 3788 BlockJob *job = find_block_job(device, &aio_context, errp); 3789 3790 if (!job) { 3791 return; 3792 } 3793 3794 if (!has_force) { 3795 force = false; 3796 } 3797 3798 if (block_job_user_paused(job) && !force) { 3799 error_setg(errp, "The block job for device '%s' is currently paused", 3800 device); 3801 goto out; 3802 } 3803 3804 trace_qmp_block_job_cancel(job); 3805 block_job_cancel(job); 3806 out: 3807 aio_context_release(aio_context); 3808 } 3809 3810 void qmp_block_job_pause(const char *device, Error **errp) 3811 { 3812 AioContext *aio_context; 3813 BlockJob *job = find_block_job(device, &aio_context, errp); 3814 3815 if (!job || block_job_user_paused(job)) { 3816 return; 3817 } 3818 3819 trace_qmp_block_job_pause(job); 3820 block_job_user_pause(job); 3821 aio_context_release(aio_context); 3822 } 3823 3824 void qmp_block_job_resume(const char *device, Error **errp) 3825 { 3826 AioContext *aio_context; 3827 BlockJob *job = find_block_job(device, &aio_context, errp); 3828 3829 if (!job || !block_job_user_paused(job)) { 3830 return; 3831 } 3832 3833 trace_qmp_block_job_resume(job); 3834 block_job_user_resume(job); 3835 aio_context_release(aio_context); 3836 } 3837 3838 void qmp_block_job_complete(const char *device, Error **errp) 3839 { 3840 AioContext *aio_context; 3841 BlockJob *job = find_block_job(device, &aio_context, errp); 3842 3843 if (!job) { 3844 return; 3845 } 3846 3847 trace_qmp_block_job_complete(job); 3848 block_job_complete(job, errp); 3849 aio_context_release(aio_context); 3850 } 3851 3852 void qmp_change_backing_file(const char *device, 3853 const char *image_node_name, 3854 const char *backing_file, 3855 Error **errp) 3856 { 3857 BlockDriverState *bs = NULL; 3858 AioContext *aio_context; 3859 BlockDriverState *image_bs = NULL; 3860 Error *local_err = NULL; 3861 bool ro; 3862 int open_flags; 3863 int ret; 3864 3865 bs = qmp_get_root_bs(device, errp); 3866 if (!bs) { 3867 return; 3868 } 3869 3870 aio_context = bdrv_get_aio_context(bs); 3871 aio_context_acquire(aio_context); 3872 3873 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3874 if (local_err) { 3875 error_propagate(errp, local_err); 3876 goto out; 3877 } 3878 3879 if (!image_bs) { 3880 error_setg(errp, "image file not found"); 3881 goto out; 3882 } 3883 3884 if (bdrv_find_base(image_bs) == image_bs) { 3885 error_setg(errp, "not allowing backing file change on an image " 3886 "without a backing file"); 3887 goto out; 3888 } 3889 3890 /* even though we are not necessarily operating on bs, we need it to 3891 * determine if block ops are currently prohibited on the chain */ 3892 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3893 goto out; 3894 } 3895 3896 /* final sanity check */ 3897 if (!bdrv_chain_contains(bs, image_bs)) { 3898 error_setg(errp, "'%s' and image file are not in the same chain", 3899 device); 3900 goto out; 3901 } 3902 3903 /* if not r/w, reopen to make r/w */ 3904 open_flags = image_bs->open_flags; 3905 ro = bdrv_is_read_only(image_bs); 3906 3907 if (ro) { 3908 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3909 if (local_err) { 3910 error_propagate(errp, local_err); 3911 goto out; 3912 } 3913 } 3914 3915 ret = bdrv_change_backing_file(image_bs, backing_file, 3916 image_bs->drv ? image_bs->drv->format_name : ""); 3917 3918 if (ret < 0) { 3919 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3920 backing_file); 3921 /* don't exit here, so we can try to restore open flags if 3922 * appropriate */ 3923 } 3924 3925 if (ro) { 3926 bdrv_reopen(image_bs, open_flags, &local_err); 3927 error_propagate(errp, local_err); 3928 } 3929 3930 out: 3931 aio_context_release(aio_context); 3932 } 3933 3934 void hmp_drive_add_node(Monitor *mon, const char *optstr) 3935 { 3936 QemuOpts *opts; 3937 QDict *qdict; 3938 Error *local_err = NULL; 3939 3940 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 3941 if (!opts) { 3942 return; 3943 } 3944 3945 qdict = qemu_opts_to_qdict(opts, NULL); 3946 3947 if (!qdict_get_try_str(qdict, "node-name")) { 3948 QDECREF(qdict); 3949 error_report("'node-name' needs to be specified"); 3950 goto out; 3951 } 3952 3953 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 3954 if (!bs) { 3955 error_report_err(local_err); 3956 goto out; 3957 } 3958 3959 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 3960 3961 out: 3962 qemu_opts_del(opts); 3963 } 3964 3965 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3966 { 3967 BlockDriverState *bs; 3968 QObject *obj; 3969 Visitor *v = qobject_output_visitor_new(&obj); 3970 QDict *qdict; 3971 const QDictEntry *ent; 3972 Error *local_err = NULL; 3973 3974 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 3975 if (local_err) { 3976 error_propagate(errp, local_err); 3977 goto fail; 3978 } 3979 3980 visit_complete(v, &obj); 3981 qdict = qobject_to_qdict(obj); 3982 3983 qdict_flatten(qdict); 3984 3985 /* 3986 * Rewrite "backing": null to "backing": "" 3987 * TODO Rewrite "" to null instead, and perhaps not even here 3988 */ 3989 for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) { 3990 char *dot = strrchr(ent->key, '.'); 3991 3992 if (!strcmp(dot ? dot + 1 : ent->key, "backing") 3993 && qobject_type(ent->value) == QTYPE_QNULL) { 3994 qdict_put(qdict, ent->key, qstring_new()); 3995 } 3996 } 3997 3998 if (!qdict_get_try_str(qdict, "node-name")) { 3999 error_setg(errp, "'node-name' must be specified for the root node"); 4000 goto fail; 4001 } 4002 4003 bs = bds_tree_init(qdict, errp); 4004 if (!bs) { 4005 goto fail; 4006 } 4007 4008 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4009 4010 fail: 4011 visit_free(v); 4012 } 4013 4014 void qmp_blockdev_del(const char *node_name, Error **errp) 4015 { 4016 AioContext *aio_context; 4017 BlockDriverState *bs; 4018 4019 bs = bdrv_find_node(node_name); 4020 if (!bs) { 4021 error_setg(errp, "Cannot find node %s", node_name); 4022 return; 4023 } 4024 if (bdrv_has_blk(bs)) { 4025 error_setg(errp, "Node %s is in use", node_name); 4026 return; 4027 } 4028 aio_context = bdrv_get_aio_context(bs); 4029 aio_context_acquire(aio_context); 4030 4031 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4032 goto out; 4033 } 4034 4035 if (!bs->monitor_list.tqe_prev) { 4036 error_setg(errp, "Node %s is not owned by the monitor", 4037 bs->node_name); 4038 goto out; 4039 } 4040 4041 if (bs->refcnt > 1) { 4042 error_setg(errp, "Block device %s is in use", 4043 bdrv_get_device_or_node_name(bs)); 4044 goto out; 4045 } 4046 4047 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4048 bdrv_unref(bs); 4049 4050 out: 4051 aio_context_release(aio_context); 4052 } 4053 4054 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4055 const char *child_name) 4056 { 4057 BdrvChild *child; 4058 4059 QLIST_FOREACH(child, &parent_bs->children, next) { 4060 if (strcmp(child->name, child_name) == 0) { 4061 return child; 4062 } 4063 } 4064 4065 return NULL; 4066 } 4067 4068 void qmp_x_blockdev_change(const char *parent, bool has_child, 4069 const char *child, bool has_node, 4070 const char *node, Error **errp) 4071 { 4072 BlockDriverState *parent_bs, *new_bs = NULL; 4073 BdrvChild *p_child; 4074 4075 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4076 if (!parent_bs) { 4077 return; 4078 } 4079 4080 if (has_child == has_node) { 4081 if (has_child) { 4082 error_setg(errp, "The parameters child and node are in conflict"); 4083 } else { 4084 error_setg(errp, "Either child or node must be specified"); 4085 } 4086 return; 4087 } 4088 4089 if (has_child) { 4090 p_child = bdrv_find_child(parent_bs, child); 4091 if (!p_child) { 4092 error_setg(errp, "Node '%s' does not have child '%s'", 4093 parent, child); 4094 return; 4095 } 4096 bdrv_del_child(parent_bs, p_child, errp); 4097 } 4098 4099 if (has_node) { 4100 new_bs = bdrv_find_node(node); 4101 if (!new_bs) { 4102 error_setg(errp, "Node '%s' not found", node); 4103 return; 4104 } 4105 bdrv_add_child(parent_bs, new_bs, errp); 4106 } 4107 } 4108 4109 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4110 { 4111 BlockJobInfoList *head = NULL, **p_next = &head; 4112 BlockJob *job; 4113 4114 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4115 BlockJobInfoList *elem; 4116 AioContext *aio_context; 4117 4118 if (block_job_is_internal(job)) { 4119 continue; 4120 } 4121 elem = g_new0(BlockJobInfoList, 1); 4122 aio_context = blk_get_aio_context(job->blk); 4123 aio_context_acquire(aio_context); 4124 elem->value = block_job_query(job, errp); 4125 aio_context_release(aio_context); 4126 if (!elem->value) { 4127 g_free(elem); 4128 qapi_free_BlockJobInfoList(head); 4129 return NULL; 4130 } 4131 *p_next = elem; 4132 p_next = &elem->next; 4133 } 4134 4135 return head; 4136 } 4137 4138 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4139 bool has_force, bool force, Error **errp) 4140 { 4141 AioContext *old_context; 4142 AioContext *new_context; 4143 BlockDriverState *bs; 4144 4145 bs = bdrv_find_node(node_name); 4146 if (!bs) { 4147 error_setg(errp, "Cannot find node %s", node_name); 4148 return; 4149 } 4150 4151 /* Protects against accidents. */ 4152 if (!(has_force && force) && bdrv_has_blk(bs)) { 4153 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4154 "be in use (use force=true to override this check)", 4155 node_name); 4156 return; 4157 } 4158 4159 if (iothread->type == QTYPE_QSTRING) { 4160 IOThread *obj = iothread_by_id(iothread->u.s); 4161 if (!obj) { 4162 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4163 return; 4164 } 4165 4166 new_context = iothread_get_aio_context(obj); 4167 } else { 4168 new_context = qemu_get_aio_context(); 4169 } 4170 4171 old_context = bdrv_get_aio_context(bs); 4172 aio_context_acquire(old_context); 4173 4174 bdrv_set_aio_context(bs, new_context); 4175 4176 aio_context_release(old_context); 4177 } 4178 4179 QemuOptsList qemu_common_drive_opts = { 4180 .name = "drive", 4181 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4182 .desc = { 4183 { 4184 .name = "snapshot", 4185 .type = QEMU_OPT_BOOL, 4186 .help = "enable/disable snapshot mode", 4187 },{ 4188 .name = "aio", 4189 .type = QEMU_OPT_STRING, 4190 .help = "host AIO implementation (threads, native)", 4191 },{ 4192 .name = BDRV_OPT_CACHE_WB, 4193 .type = QEMU_OPT_BOOL, 4194 .help = "Enable writeback mode", 4195 },{ 4196 .name = "format", 4197 .type = QEMU_OPT_STRING, 4198 .help = "disk format (raw, qcow2, ...)", 4199 },{ 4200 .name = "rerror", 4201 .type = QEMU_OPT_STRING, 4202 .help = "read error action", 4203 },{ 4204 .name = "werror", 4205 .type = QEMU_OPT_STRING, 4206 .help = "write error action", 4207 },{ 4208 .name = BDRV_OPT_READ_ONLY, 4209 .type = QEMU_OPT_BOOL, 4210 .help = "open drive file as read-only", 4211 }, 4212 4213 THROTTLE_OPTS, 4214 4215 { 4216 .name = "throttling.group", 4217 .type = QEMU_OPT_STRING, 4218 .help = "name of the block throttling group", 4219 },{ 4220 .name = "copy-on-read", 4221 .type = QEMU_OPT_BOOL, 4222 .help = "copy read data from backing file into image file", 4223 },{ 4224 .name = "detect-zeroes", 4225 .type = QEMU_OPT_STRING, 4226 .help = "try to optimize zero writes (off, on, unmap)", 4227 },{ 4228 .name = "stats-account-invalid", 4229 .type = QEMU_OPT_BOOL, 4230 .help = "whether to account for invalid I/O operations " 4231 "in the statistics", 4232 },{ 4233 .name = "stats-account-failed", 4234 .type = QEMU_OPT_BOOL, 4235 .help = "whether to account for failed I/O operations " 4236 "in the statistics", 4237 }, 4238 { /* end of list */ } 4239 }, 4240 }; 4241 4242 QemuOptsList qemu_drive_opts = { 4243 .name = "drive", 4244 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4245 .desc = { 4246 /* 4247 * no elements => accept any params 4248 * validation will happen later 4249 */ 4250 { /* end of list */ } 4251 }, 4252 }; 4253