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