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/qmp-output-visitor.h" 47 #include "qapi/util.h" 48 #include "sysemu/sysemu.h" 49 #include "block/block_int.h" 50 #include "qmp-commands.h" 51 #include "trace.h" 52 #include "sysemu/arch_init.h" 53 #include "qemu/cutils.h" 54 #include "qemu/help_option.h" 55 56 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 58 59 static int do_open_tray(const char *device, bool force, Error **errp); 60 61 static const char *const if_name[IF_COUNT] = { 62 [IF_NONE] = "none", 63 [IF_IDE] = "ide", 64 [IF_SCSI] = "scsi", 65 [IF_FLOPPY] = "floppy", 66 [IF_PFLASH] = "pflash", 67 [IF_MTD] = "mtd", 68 [IF_SD] = "sd", 69 [IF_VIRTIO] = "virtio", 70 [IF_XEN] = "xen", 71 }; 72 73 static int if_max_devs[IF_COUNT] = { 74 /* 75 * Do not change these numbers! They govern how drive option 76 * index maps to unit and bus. That mapping is ABI. 77 * 78 * All controllers used to implement if=T drives need to support 79 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 80 * Otherwise, some index values map to "impossible" bus, unit 81 * values. 82 * 83 * For instance, if you change [IF_SCSI] to 255, -drive 84 * if=scsi,index=12 no longer means bus=1,unit=5, but 85 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 86 * the drive can't be set up. Regression. 87 */ 88 [IF_IDE] = 2, 89 [IF_SCSI] = 7, 90 }; 91 92 /** 93 * Boards may call this to offer board-by-board overrides 94 * of the default, global values. 95 */ 96 void override_max_devs(BlockInterfaceType type, int max_devs) 97 { 98 BlockBackend *blk; 99 DriveInfo *dinfo; 100 101 if (max_devs <= 0) { 102 return; 103 } 104 105 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 106 dinfo = blk_legacy_dinfo(blk); 107 if (dinfo->type == type) { 108 fprintf(stderr, "Cannot override units-per-bus property of" 109 " the %s interface, because a drive of that type has" 110 " already been added.\n", if_name[type]); 111 g_assert_not_reached(); 112 } 113 } 114 115 if_max_devs[type] = max_devs; 116 } 117 118 /* 119 * We automatically delete the drive when a device using it gets 120 * unplugged. Questionable feature, but we can't just drop it. 121 * Device models call blockdev_mark_auto_del() to schedule the 122 * automatic deletion, and generic qdev code calls blockdev_auto_del() 123 * when deletion is actually safe. 124 */ 125 void blockdev_mark_auto_del(BlockBackend *blk) 126 { 127 DriveInfo *dinfo = blk_legacy_dinfo(blk); 128 BlockDriverState *bs = blk_bs(blk); 129 AioContext *aio_context; 130 131 if (!dinfo) { 132 return; 133 } 134 135 if (bs) { 136 aio_context = bdrv_get_aio_context(bs); 137 aio_context_acquire(aio_context); 138 139 if (bs->job) { 140 block_job_cancel(bs->job); 141 } 142 143 aio_context_release(aio_context); 144 } 145 146 dinfo->auto_del = 1; 147 } 148 149 void blockdev_auto_del(BlockBackend *blk) 150 { 151 DriveInfo *dinfo = blk_legacy_dinfo(blk); 152 153 if (dinfo && dinfo->auto_del) { 154 monitor_remove_blk(blk); 155 blk_unref(blk); 156 } 157 } 158 159 /** 160 * Returns the current mapping of how many units per bus 161 * a particular interface can support. 162 * 163 * A positive integer indicates n units per bus. 164 * 0 implies the mapping has not been established. 165 * -1 indicates an invalid BlockInterfaceType was given. 166 */ 167 int drive_get_max_devs(BlockInterfaceType type) 168 { 169 if (type >= IF_IDE && type < IF_COUNT) { 170 return if_max_devs[type]; 171 } 172 173 return -1; 174 } 175 176 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 177 { 178 int max_devs = if_max_devs[type]; 179 return max_devs ? index / max_devs : 0; 180 } 181 182 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 183 { 184 int max_devs = if_max_devs[type]; 185 return max_devs ? index % max_devs : index; 186 } 187 188 QemuOpts *drive_def(const char *optstr) 189 { 190 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 191 } 192 193 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 194 const char *optstr) 195 { 196 QemuOpts *opts; 197 198 opts = drive_def(optstr); 199 if (!opts) { 200 return NULL; 201 } 202 if (type != IF_DEFAULT) { 203 qemu_opt_set(opts, "if", if_name[type], &error_abort); 204 } 205 if (index >= 0) { 206 qemu_opt_set_number(opts, "index", index, &error_abort); 207 } 208 if (file) 209 qemu_opt_set(opts, "file", file, &error_abort); 210 return opts; 211 } 212 213 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 214 { 215 BlockBackend *blk; 216 DriveInfo *dinfo; 217 218 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 219 dinfo = blk_legacy_dinfo(blk); 220 if (dinfo && dinfo->type == type 221 && dinfo->bus == bus && dinfo->unit == unit) { 222 return dinfo; 223 } 224 } 225 226 return NULL; 227 } 228 229 bool drive_check_orphaned(void) 230 { 231 BlockBackend *blk; 232 DriveInfo *dinfo; 233 bool rs = false; 234 235 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 236 dinfo = blk_legacy_dinfo(blk); 237 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 238 /* Unless this is a default drive, this may be an oversight. */ 239 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 240 dinfo->type != IF_NONE) { 241 fprintf(stderr, "Warning: Orphaned drive without device: " 242 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 243 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "", 244 if_name[dinfo->type], dinfo->bus, dinfo->unit); 245 rs = true; 246 } 247 } 248 249 return rs; 250 } 251 252 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 253 { 254 return drive_get(type, 255 drive_index_to_bus_id(type, index), 256 drive_index_to_unit_id(type, index)); 257 } 258 259 int drive_get_max_bus(BlockInterfaceType type) 260 { 261 int max_bus; 262 BlockBackend *blk; 263 DriveInfo *dinfo; 264 265 max_bus = -1; 266 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 267 dinfo = blk_legacy_dinfo(blk); 268 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 269 max_bus = dinfo->bus; 270 } 271 } 272 return max_bus; 273 } 274 275 /* Get a block device. This should only be used for single-drive devices 276 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 277 appropriate bus. */ 278 DriveInfo *drive_get_next(BlockInterfaceType type) 279 { 280 static int next_block_unit[IF_COUNT]; 281 282 return drive_get(type, 0, next_block_unit[type]++); 283 } 284 285 static void bdrv_format_print(void *opaque, const char *name) 286 { 287 error_printf(" %s", name); 288 } 289 290 typedef struct { 291 QEMUBH *bh; 292 BlockDriverState *bs; 293 } BDRVPutRefBH; 294 295 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 296 { 297 if (!strcmp(buf, "ignore")) { 298 return BLOCKDEV_ON_ERROR_IGNORE; 299 } else if (!is_read && !strcmp(buf, "enospc")) { 300 return BLOCKDEV_ON_ERROR_ENOSPC; 301 } else if (!strcmp(buf, "stop")) { 302 return BLOCKDEV_ON_ERROR_STOP; 303 } else if (!strcmp(buf, "report")) { 304 return BLOCKDEV_ON_ERROR_REPORT; 305 } else { 306 error_setg(errp, "'%s' invalid %s error action", 307 buf, is_read ? "read" : "write"); 308 return -1; 309 } 310 } 311 312 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 313 Error **errp) 314 { 315 const QListEntry *entry; 316 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 317 switch (qobject_type(entry->value)) { 318 319 case QTYPE_QSTRING: { 320 unsigned long long length; 321 const char *str = qstring_get_str(qobject_to_qstring(entry->value)); 322 if (parse_uint_full(str, &length, 10) == 0 && 323 length > 0 && length <= UINT_MAX) { 324 block_acct_add_interval(stats, (unsigned) length); 325 } else { 326 error_setg(errp, "Invalid interval length: %s", str); 327 return false; 328 } 329 break; 330 } 331 332 case QTYPE_QINT: { 333 int64_t length = qint_get_int(qobject_to_qint(entry->value)); 334 if (length > 0 && length <= UINT_MAX) { 335 block_acct_add_interval(stats, (unsigned) length); 336 } else { 337 error_setg(errp, "Invalid interval length: %" PRId64, length); 338 return false; 339 } 340 break; 341 } 342 343 default: 344 error_setg(errp, "The specification of stats-intervals is invalid"); 345 return false; 346 } 347 } 348 return true; 349 } 350 351 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 352 353 /* All parameters but @opts are optional and may be set to NULL. */ 354 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 355 const char **throttling_group, ThrottleConfig *throttle_cfg, 356 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 357 { 358 const char *discard; 359 Error *local_error = NULL; 360 const char *aio; 361 362 if (bdrv_flags) { 363 if (!qemu_opt_get_bool(opts, "read-only", false)) { 364 *bdrv_flags |= BDRV_O_RDWR; 365 } 366 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 367 *bdrv_flags |= BDRV_O_COPY_ON_READ; 368 } 369 370 if ((discard = qemu_opt_get(opts, "discard")) != NULL) { 371 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) { 372 error_setg(errp, "Invalid discard option"); 373 return; 374 } 375 } 376 377 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 378 if (!strcmp(aio, "native")) { 379 *bdrv_flags |= BDRV_O_NATIVE_AIO; 380 } else if (!strcmp(aio, "threads")) { 381 /* this is the default */ 382 } else { 383 error_setg(errp, "invalid aio option"); 384 return; 385 } 386 } 387 } 388 389 /* disk I/O throttling */ 390 if (throttling_group) { 391 *throttling_group = qemu_opt_get(opts, "throttling.group"); 392 } 393 394 if (throttle_cfg) { 395 throttle_config_init(throttle_cfg); 396 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 397 qemu_opt_get_number(opts, "throttling.bps-total", 0); 398 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 399 qemu_opt_get_number(opts, "throttling.bps-read", 0); 400 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 401 qemu_opt_get_number(opts, "throttling.bps-write", 0); 402 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 403 qemu_opt_get_number(opts, "throttling.iops-total", 0); 404 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 405 qemu_opt_get_number(opts, "throttling.iops-read", 0); 406 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 407 qemu_opt_get_number(opts, "throttling.iops-write", 0); 408 409 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 410 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 411 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 412 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 413 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 414 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 415 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 416 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 417 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 418 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 419 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 420 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 421 422 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 423 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 424 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 425 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 426 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 427 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 428 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 429 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 430 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 431 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 432 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 433 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 434 435 throttle_cfg->op_size = 436 qemu_opt_get_number(opts, "throttling.iops-size", 0); 437 438 if (!throttle_is_valid(throttle_cfg, errp)) { 439 return; 440 } 441 } 442 443 if (detect_zeroes) { 444 *detect_zeroes = 445 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 446 qemu_opt_get(opts, "detect-zeroes"), 447 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX, 448 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 449 &local_error); 450 if (local_error) { 451 error_propagate(errp, local_error); 452 return; 453 } 454 455 if (bdrv_flags && 456 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 457 !(*bdrv_flags & BDRV_O_UNMAP)) 458 { 459 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 460 "without setting discard operation to unmap"); 461 return; 462 } 463 } 464 } 465 466 /* Takes the ownership of bs_opts */ 467 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 468 Error **errp) 469 { 470 const char *buf; 471 int bdrv_flags = 0; 472 int on_read_error, on_write_error; 473 bool account_invalid, account_failed; 474 bool writethrough; 475 BlockBackend *blk; 476 BlockDriverState *bs; 477 ThrottleConfig cfg; 478 int snapshot = 0; 479 Error *error = NULL; 480 QemuOpts *opts; 481 QDict *interval_dict = NULL; 482 QList *interval_list = NULL; 483 const char *id; 484 BlockdevDetectZeroesOptions detect_zeroes = 485 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 486 const char *throttling_group = NULL; 487 488 /* Check common options by copying from bs_opts to opts, all other options 489 * stay in bs_opts for processing by bdrv_open(). */ 490 id = qdict_get_try_str(bs_opts, "id"); 491 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 492 if (error) { 493 error_propagate(errp, error); 494 goto err_no_opts; 495 } 496 497 qemu_opts_absorb_qdict(opts, bs_opts, &error); 498 if (error) { 499 error_propagate(errp, error); 500 goto early_err; 501 } 502 503 if (id) { 504 qdict_del(bs_opts, "id"); 505 } 506 507 /* extract parameters */ 508 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 509 510 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 511 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 512 513 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 514 515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 516 qdict_array_split(interval_dict, &interval_list); 517 518 if (qdict_size(interval_dict) != 0) { 519 error_setg(errp, "Invalid option stats-intervals.%s", 520 qdict_first(interval_dict)->key); 521 goto early_err; 522 } 523 524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 525 &detect_zeroes, &error); 526 if (error) { 527 error_propagate(errp, error); 528 goto early_err; 529 } 530 531 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 532 if (is_help_option(buf)) { 533 error_printf("Supported formats:"); 534 bdrv_iterate_format(bdrv_format_print, NULL); 535 error_printf("\n"); 536 goto early_err; 537 } 538 539 if (qdict_haskey(bs_opts, "driver")) { 540 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 541 goto early_err; 542 } 543 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 544 } 545 546 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 547 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 548 on_write_error = parse_block_error_action(buf, 0, &error); 549 if (error) { 550 error_propagate(errp, error); 551 goto early_err; 552 } 553 } 554 555 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 556 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 557 on_read_error = parse_block_error_action(buf, 1, &error); 558 if (error) { 559 error_propagate(errp, error); 560 goto early_err; 561 } 562 } 563 564 if (snapshot) { 565 bdrv_flags |= BDRV_O_SNAPSHOT; 566 } 567 568 /* init */ 569 if ((!file || !*file) && !qdict_size(bs_opts)) { 570 BlockBackendRootState *blk_rs; 571 572 blk = blk_new(); 573 blk_rs = blk_get_root_state(blk); 574 blk_rs->open_flags = bdrv_flags; 575 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR); 576 blk_rs->detect_zeroes = detect_zeroes; 577 578 QDECREF(bs_opts); 579 } else { 580 if (file && !*file) { 581 file = NULL; 582 } 583 584 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 585 * with other callers) rather than what we want as the real defaults. 586 * Apply the defaults here instead. */ 587 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 588 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 589 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 590 591 if (runstate_check(RUN_STATE_INMIGRATE)) { 592 bdrv_flags |= BDRV_O_INACTIVE; 593 } 594 595 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 596 if (!blk) { 597 goto err_no_bs_opts; 598 } 599 bs = blk_bs(blk); 600 601 bs->detect_zeroes = detect_zeroes; 602 603 if (bdrv_key_required(bs)) { 604 autostart = 0; 605 } 606 607 block_acct_init(blk_get_stats(blk), account_invalid, account_failed); 608 609 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 610 blk_unref(blk); 611 blk = NULL; 612 goto err_no_bs_opts; 613 } 614 } 615 616 /* disk I/O throttling */ 617 if (throttle_enabled(&cfg)) { 618 if (!throttling_group) { 619 throttling_group = blk_name(blk); 620 } 621 blk_io_limits_enable(blk, throttling_group); 622 blk_set_io_limits(blk, &cfg); 623 } 624 625 blk_set_enable_write_cache(blk, !writethrough); 626 blk_set_on_error(blk, on_read_error, on_write_error); 627 628 if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) { 629 blk_unref(blk); 630 blk = NULL; 631 goto err_no_bs_opts; 632 } 633 634 err_no_bs_opts: 635 qemu_opts_del(opts); 636 QDECREF(interval_dict); 637 QDECREF(interval_list); 638 return blk; 639 640 early_err: 641 qemu_opts_del(opts); 642 QDECREF(interval_dict); 643 QDECREF(interval_list); 644 err_no_opts: 645 QDECREF(bs_opts); 646 return NULL; 647 } 648 649 static QemuOptsList qemu_root_bds_opts; 650 651 /* Takes the ownership of bs_opts */ 652 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 653 { 654 BlockDriverState *bs; 655 QemuOpts *opts; 656 Error *local_error = NULL; 657 BlockdevDetectZeroesOptions detect_zeroes; 658 int bdrv_flags = 0; 659 660 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp); 661 if (!opts) { 662 goto fail; 663 } 664 665 qemu_opts_absorb_qdict(opts, bs_opts, &local_error); 666 if (local_error) { 667 error_propagate(errp, local_error); 668 goto fail; 669 } 670 671 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL, 672 &detect_zeroes, &local_error); 673 if (local_error) { 674 error_propagate(errp, local_error); 675 goto fail; 676 } 677 678 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 679 * with other callers) rather than what we want as the real defaults. 680 * Apply the defaults here instead. */ 681 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 682 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 683 684 if (runstate_check(RUN_STATE_INMIGRATE)) { 685 bdrv_flags |= BDRV_O_INACTIVE; 686 } 687 688 bs = bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 689 if (!bs) { 690 goto fail_no_bs_opts; 691 } 692 693 bs->detect_zeroes = detect_zeroes; 694 695 fail_no_bs_opts: 696 qemu_opts_del(opts); 697 return bs; 698 699 fail: 700 qemu_opts_del(opts); 701 QDECREF(bs_opts); 702 return NULL; 703 } 704 705 void blockdev_close_all_bdrv_states(void) 706 { 707 BlockDriverState *bs, *next_bs; 708 709 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 710 AioContext *ctx = bdrv_get_aio_context(bs); 711 712 aio_context_acquire(ctx); 713 bdrv_unref(bs); 714 aio_context_release(ctx); 715 } 716 } 717 718 /* Iterates over the list of monitor-owned BlockDriverStates */ 719 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 720 { 721 return bs ? QTAILQ_NEXT(bs, monitor_list) 722 : QTAILQ_FIRST(&monitor_bdrv_states); 723 } 724 725 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 726 Error **errp) 727 { 728 const char *value; 729 730 value = qemu_opt_get(opts, from); 731 if (value) { 732 if (qemu_opt_find(opts, to)) { 733 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 734 "same time", to, from); 735 return; 736 } 737 } 738 739 /* rename all items in opts */ 740 while ((value = qemu_opt_get(opts, from))) { 741 qemu_opt_set(opts, to, value, &error_abort); 742 qemu_opt_unset(opts, from); 743 } 744 } 745 746 QemuOptsList qemu_legacy_drive_opts = { 747 .name = "drive", 748 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 749 .desc = { 750 { 751 .name = "bus", 752 .type = QEMU_OPT_NUMBER, 753 .help = "bus number", 754 },{ 755 .name = "unit", 756 .type = QEMU_OPT_NUMBER, 757 .help = "unit number (i.e. lun for scsi)", 758 },{ 759 .name = "index", 760 .type = QEMU_OPT_NUMBER, 761 .help = "index number", 762 },{ 763 .name = "media", 764 .type = QEMU_OPT_STRING, 765 .help = "media type (disk, cdrom)", 766 },{ 767 .name = "if", 768 .type = QEMU_OPT_STRING, 769 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 770 },{ 771 .name = "cyls", 772 .type = QEMU_OPT_NUMBER, 773 .help = "number of cylinders (ide disk geometry)", 774 },{ 775 .name = "heads", 776 .type = QEMU_OPT_NUMBER, 777 .help = "number of heads (ide disk geometry)", 778 },{ 779 .name = "secs", 780 .type = QEMU_OPT_NUMBER, 781 .help = "number of sectors (ide disk geometry)", 782 },{ 783 .name = "trans", 784 .type = QEMU_OPT_STRING, 785 .help = "chs translation (auto, lba, none)", 786 },{ 787 .name = "boot", 788 .type = QEMU_OPT_BOOL, 789 .help = "(deprecated, ignored)", 790 },{ 791 .name = "addr", 792 .type = QEMU_OPT_STRING, 793 .help = "pci address (virtio only)", 794 },{ 795 .name = "serial", 796 .type = QEMU_OPT_STRING, 797 .help = "disk serial number", 798 },{ 799 .name = "file", 800 .type = QEMU_OPT_STRING, 801 .help = "file name", 802 }, 803 804 /* Options that are passed on, but have special semantics with -drive */ 805 { 806 .name = "read-only", 807 .type = QEMU_OPT_BOOL, 808 .help = "open drive file as read-only", 809 },{ 810 .name = "rerror", 811 .type = QEMU_OPT_STRING, 812 .help = "read error action", 813 },{ 814 .name = "werror", 815 .type = QEMU_OPT_STRING, 816 .help = "write error action", 817 },{ 818 .name = "copy-on-read", 819 .type = QEMU_OPT_BOOL, 820 .help = "copy read data from backing file into image file", 821 }, 822 823 { /* end of list */ } 824 }, 825 }; 826 827 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 828 { 829 const char *value; 830 BlockBackend *blk; 831 DriveInfo *dinfo = NULL; 832 QDict *bs_opts; 833 QemuOpts *legacy_opts; 834 DriveMediaType media = MEDIA_DISK; 835 BlockInterfaceType type; 836 int cyls, heads, secs, translation; 837 int max_devs, bus_id, unit_id, index; 838 const char *devaddr; 839 const char *werror, *rerror; 840 bool read_only = false; 841 bool copy_on_read; 842 const char *serial; 843 const char *filename; 844 Error *local_err = NULL; 845 int i; 846 847 /* Change legacy command line options into QMP ones */ 848 static const struct { 849 const char *from; 850 const char *to; 851 } opt_renames[] = { 852 { "iops", "throttling.iops-total" }, 853 { "iops_rd", "throttling.iops-read" }, 854 { "iops_wr", "throttling.iops-write" }, 855 856 { "bps", "throttling.bps-total" }, 857 { "bps_rd", "throttling.bps-read" }, 858 { "bps_wr", "throttling.bps-write" }, 859 860 { "iops_max", "throttling.iops-total-max" }, 861 { "iops_rd_max", "throttling.iops-read-max" }, 862 { "iops_wr_max", "throttling.iops-write-max" }, 863 864 { "bps_max", "throttling.bps-total-max" }, 865 { "bps_rd_max", "throttling.bps-read-max" }, 866 { "bps_wr_max", "throttling.bps-write-max" }, 867 868 { "iops_size", "throttling.iops-size" }, 869 870 { "group", "throttling.group" }, 871 872 { "readonly", "read-only" }, 873 }; 874 875 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 876 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 877 &local_err); 878 if (local_err) { 879 error_report_err(local_err); 880 return NULL; 881 } 882 } 883 884 value = qemu_opt_get(all_opts, "cache"); 885 if (value) { 886 int flags = 0; 887 bool writethrough; 888 889 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 890 error_report("invalid cache option"); 891 return NULL; 892 } 893 894 /* Specific options take precedence */ 895 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 896 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 897 !writethrough, &error_abort); 898 } 899 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 900 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 901 !!(flags & BDRV_O_NOCACHE), &error_abort); 902 } 903 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 904 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 905 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 906 } 907 qemu_opt_unset(all_opts, "cache"); 908 } 909 910 /* Get a QDict for processing the options */ 911 bs_opts = qdict_new(); 912 qemu_opts_to_qdict(all_opts, bs_opts); 913 914 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 915 &error_abort); 916 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 917 if (local_err) { 918 error_report_err(local_err); 919 goto fail; 920 } 921 922 /* Deprecated option boot=[on|off] */ 923 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 924 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 925 "ignored. Future versions will reject this parameter. Please " 926 "update your scripts.\n"); 927 } 928 929 /* Media type */ 930 value = qemu_opt_get(legacy_opts, "media"); 931 if (value) { 932 if (!strcmp(value, "disk")) { 933 media = MEDIA_DISK; 934 } else if (!strcmp(value, "cdrom")) { 935 media = MEDIA_CDROM; 936 read_only = true; 937 } else { 938 error_report("'%s' invalid media", value); 939 goto fail; 940 } 941 } 942 943 /* copy-on-read is disabled with a warning for read-only devices */ 944 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 945 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 946 947 if (read_only && copy_on_read) { 948 error_report("warning: disabling copy-on-read on read-only drive"); 949 copy_on_read = false; 950 } 951 952 qdict_put(bs_opts, "read-only", 953 qstring_from_str(read_only ? "on" : "off")); 954 qdict_put(bs_opts, "copy-on-read", 955 qstring_from_str(copy_on_read ? "on" :"off")); 956 957 /* Controller type */ 958 value = qemu_opt_get(legacy_opts, "if"); 959 if (value) { 960 for (type = 0; 961 type < IF_COUNT && strcmp(value, if_name[type]); 962 type++) { 963 } 964 if (type == IF_COUNT) { 965 error_report("unsupported bus type '%s'", value); 966 goto fail; 967 } 968 } else { 969 type = block_default_type; 970 } 971 972 /* Geometry */ 973 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 974 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 975 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 976 977 if (cyls || heads || secs) { 978 if (cyls < 1) { 979 error_report("invalid physical cyls number"); 980 goto fail; 981 } 982 if (heads < 1) { 983 error_report("invalid physical heads number"); 984 goto fail; 985 } 986 if (secs < 1) { 987 error_report("invalid physical secs number"); 988 goto fail; 989 } 990 } 991 992 translation = BIOS_ATA_TRANSLATION_AUTO; 993 value = qemu_opt_get(legacy_opts, "trans"); 994 if (value != NULL) { 995 if (!cyls) { 996 error_report("'%s' trans must be used with cyls, heads and secs", 997 value); 998 goto fail; 999 } 1000 if (!strcmp(value, "none")) { 1001 translation = BIOS_ATA_TRANSLATION_NONE; 1002 } else if (!strcmp(value, "lba")) { 1003 translation = BIOS_ATA_TRANSLATION_LBA; 1004 } else if (!strcmp(value, "large")) { 1005 translation = BIOS_ATA_TRANSLATION_LARGE; 1006 } else if (!strcmp(value, "rechs")) { 1007 translation = BIOS_ATA_TRANSLATION_RECHS; 1008 } else if (!strcmp(value, "auto")) { 1009 translation = BIOS_ATA_TRANSLATION_AUTO; 1010 } else { 1011 error_report("'%s' invalid translation type", value); 1012 goto fail; 1013 } 1014 } 1015 1016 if (media == MEDIA_CDROM) { 1017 if (cyls || secs || heads) { 1018 error_report("CHS can't be set with media=cdrom"); 1019 goto fail; 1020 } 1021 } 1022 1023 /* Device address specified by bus/unit or index. 1024 * If none was specified, try to find the first free one. */ 1025 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 1026 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 1027 index = qemu_opt_get_number(legacy_opts, "index", -1); 1028 1029 max_devs = if_max_devs[type]; 1030 1031 if (index != -1) { 1032 if (bus_id != 0 || unit_id != -1) { 1033 error_report("index cannot be used with bus and unit"); 1034 goto fail; 1035 } 1036 bus_id = drive_index_to_bus_id(type, index); 1037 unit_id = drive_index_to_unit_id(type, index); 1038 } 1039 1040 if (unit_id == -1) { 1041 unit_id = 0; 1042 while (drive_get(type, bus_id, unit_id) != NULL) { 1043 unit_id++; 1044 if (max_devs && unit_id >= max_devs) { 1045 unit_id -= max_devs; 1046 bus_id++; 1047 } 1048 } 1049 } 1050 1051 if (max_devs && unit_id >= max_devs) { 1052 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 1053 goto fail; 1054 } 1055 1056 if (drive_get(type, bus_id, unit_id) != NULL) { 1057 error_report("drive with bus=%d, unit=%d (index=%d) exists", 1058 bus_id, unit_id, index); 1059 goto fail; 1060 } 1061 1062 /* Serial number */ 1063 serial = qemu_opt_get(legacy_opts, "serial"); 1064 1065 /* no id supplied -> create one */ 1066 if (qemu_opts_id(all_opts) == NULL) { 1067 char *new_id; 1068 const char *mediastr = ""; 1069 if (type == IF_IDE || type == IF_SCSI) { 1070 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 1071 } 1072 if (max_devs) { 1073 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 1074 mediastr, unit_id); 1075 } else { 1076 new_id = g_strdup_printf("%s%s%i", if_name[type], 1077 mediastr, unit_id); 1078 } 1079 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 1080 g_free(new_id); 1081 } 1082 1083 /* Add virtio block device */ 1084 devaddr = qemu_opt_get(legacy_opts, "addr"); 1085 if (devaddr && type != IF_VIRTIO) { 1086 error_report("addr is not supported by this bus type"); 1087 goto fail; 1088 } 1089 1090 if (type == IF_VIRTIO) { 1091 QemuOpts *devopts; 1092 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 1093 &error_abort); 1094 if (arch_type == QEMU_ARCH_S390X) { 1095 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 1096 } else { 1097 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 1098 } 1099 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 1100 &error_abort); 1101 if (devaddr) { 1102 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 1103 } 1104 } 1105 1106 filename = qemu_opt_get(legacy_opts, "file"); 1107 1108 /* Check werror/rerror compatibility with if=... */ 1109 werror = qemu_opt_get(legacy_opts, "werror"); 1110 if (werror != NULL) { 1111 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 1112 type != IF_NONE) { 1113 error_report("werror is not supported by this bus type"); 1114 goto fail; 1115 } 1116 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 1117 } 1118 1119 rerror = qemu_opt_get(legacy_opts, "rerror"); 1120 if (rerror != NULL) { 1121 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 1122 type != IF_NONE) { 1123 error_report("rerror is not supported by this bus type"); 1124 goto fail; 1125 } 1126 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 1127 } 1128 1129 /* Actual block device init: Functionality shared with blockdev-add */ 1130 blk = blockdev_init(filename, bs_opts, &local_err); 1131 bs_opts = NULL; 1132 if (!blk) { 1133 if (local_err) { 1134 error_report_err(local_err); 1135 } 1136 goto fail; 1137 } else { 1138 assert(!local_err); 1139 } 1140 1141 /* Create legacy DriveInfo */ 1142 dinfo = g_malloc0(sizeof(*dinfo)); 1143 dinfo->opts = all_opts; 1144 1145 dinfo->cyls = cyls; 1146 dinfo->heads = heads; 1147 dinfo->secs = secs; 1148 dinfo->trans = translation; 1149 1150 dinfo->type = type; 1151 dinfo->bus = bus_id; 1152 dinfo->unit = unit_id; 1153 dinfo->devaddr = devaddr; 1154 dinfo->serial = g_strdup(serial); 1155 1156 blk_set_legacy_dinfo(blk, dinfo); 1157 1158 switch(type) { 1159 case IF_IDE: 1160 case IF_SCSI: 1161 case IF_XEN: 1162 case IF_NONE: 1163 dinfo->media_cd = media == MEDIA_CDROM; 1164 break; 1165 default: 1166 break; 1167 } 1168 1169 fail: 1170 qemu_opts_del(legacy_opts); 1171 QDECREF(bs_opts); 1172 return dinfo; 1173 } 1174 1175 void hmp_commit(Monitor *mon, const QDict *qdict) 1176 { 1177 const char *device = qdict_get_str(qdict, "device"); 1178 BlockBackend *blk; 1179 int ret; 1180 1181 if (!strcmp(device, "all")) { 1182 ret = blk_commit_all(); 1183 } else { 1184 BlockDriverState *bs; 1185 AioContext *aio_context; 1186 1187 blk = blk_by_name(device); 1188 if (!blk) { 1189 monitor_printf(mon, "Device '%s' not found\n", device); 1190 return; 1191 } 1192 if (!blk_is_available(blk)) { 1193 monitor_printf(mon, "Device '%s' has no medium\n", device); 1194 return; 1195 } 1196 1197 bs = blk_bs(blk); 1198 aio_context = bdrv_get_aio_context(bs); 1199 aio_context_acquire(aio_context); 1200 1201 ret = bdrv_commit(bs); 1202 1203 aio_context_release(aio_context); 1204 } 1205 if (ret < 0) { 1206 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1207 strerror(-ret)); 1208 } 1209 } 1210 1211 static void blockdev_do_action(TransactionAction *action, Error **errp) 1212 { 1213 TransactionActionList list; 1214 1215 list.value = action; 1216 list.next = NULL; 1217 qmp_transaction(&list, false, NULL, errp); 1218 } 1219 1220 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1221 bool has_node_name, const char *node_name, 1222 const char *snapshot_file, 1223 bool has_snapshot_node_name, 1224 const char *snapshot_node_name, 1225 bool has_format, const char *format, 1226 bool has_mode, NewImageMode mode, Error **errp) 1227 { 1228 BlockdevSnapshotSync snapshot = { 1229 .has_device = has_device, 1230 .device = (char *) device, 1231 .has_node_name = has_node_name, 1232 .node_name = (char *) node_name, 1233 .snapshot_file = (char *) snapshot_file, 1234 .has_snapshot_node_name = has_snapshot_node_name, 1235 .snapshot_node_name = (char *) snapshot_node_name, 1236 .has_format = has_format, 1237 .format = (char *) format, 1238 .has_mode = has_mode, 1239 .mode = mode, 1240 }; 1241 TransactionAction action = { 1242 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1243 .u.blockdev_snapshot_sync.data = &snapshot, 1244 }; 1245 blockdev_do_action(&action, errp); 1246 } 1247 1248 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1249 Error **errp) 1250 { 1251 BlockdevSnapshot snapshot_data = { 1252 .node = (char *) node, 1253 .overlay = (char *) overlay 1254 }; 1255 TransactionAction action = { 1256 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1257 .u.blockdev_snapshot.data = &snapshot_data, 1258 }; 1259 blockdev_do_action(&action, errp); 1260 } 1261 1262 void qmp_blockdev_snapshot_internal_sync(const char *device, 1263 const char *name, 1264 Error **errp) 1265 { 1266 BlockdevSnapshotInternal snapshot = { 1267 .device = (char *) device, 1268 .name = (char *) name 1269 }; 1270 TransactionAction action = { 1271 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1272 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1273 }; 1274 blockdev_do_action(&action, errp); 1275 } 1276 1277 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1278 bool has_id, 1279 const char *id, 1280 bool has_name, 1281 const char *name, 1282 Error **errp) 1283 { 1284 BlockDriverState *bs; 1285 BlockBackend *blk; 1286 AioContext *aio_context; 1287 QEMUSnapshotInfo sn; 1288 Error *local_err = NULL; 1289 SnapshotInfo *info = NULL; 1290 int ret; 1291 1292 blk = blk_by_name(device); 1293 if (!blk) { 1294 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1295 "Device '%s' not found", device); 1296 return NULL; 1297 } 1298 1299 aio_context = blk_get_aio_context(blk); 1300 aio_context_acquire(aio_context); 1301 1302 if (!has_id) { 1303 id = NULL; 1304 } 1305 1306 if (!has_name) { 1307 name = NULL; 1308 } 1309 1310 if (!id && !name) { 1311 error_setg(errp, "Name or id must be provided"); 1312 goto out_aio_context; 1313 } 1314 1315 if (!blk_is_available(blk)) { 1316 error_setg(errp, "Device '%s' has no medium", device); 1317 goto out_aio_context; 1318 } 1319 bs = blk_bs(blk); 1320 1321 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1322 goto out_aio_context; 1323 } 1324 1325 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1326 if (local_err) { 1327 error_propagate(errp, local_err); 1328 goto out_aio_context; 1329 } 1330 if (!ret) { 1331 error_setg(errp, 1332 "Snapshot with id '%s' and name '%s' does not exist on " 1333 "device '%s'", 1334 STR_OR_NULL(id), STR_OR_NULL(name), device); 1335 goto out_aio_context; 1336 } 1337 1338 bdrv_snapshot_delete(bs, id, name, &local_err); 1339 if (local_err) { 1340 error_propagate(errp, local_err); 1341 goto out_aio_context; 1342 } 1343 1344 aio_context_release(aio_context); 1345 1346 info = g_new0(SnapshotInfo, 1); 1347 info->id = g_strdup(sn.id_str); 1348 info->name = g_strdup(sn.name); 1349 info->date_nsec = sn.date_nsec; 1350 info->date_sec = sn.date_sec; 1351 info->vm_state_size = sn.vm_state_size; 1352 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1353 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1354 1355 return info; 1356 1357 out_aio_context: 1358 aio_context_release(aio_context); 1359 return NULL; 1360 } 1361 1362 /** 1363 * block_dirty_bitmap_lookup: 1364 * Return a dirty bitmap (if present), after validating 1365 * the node reference and bitmap names. 1366 * 1367 * @node: The name of the BDS node to search for bitmaps 1368 * @name: The name of the bitmap to search for 1369 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1370 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1371 * @errp: Output pointer for error information. Can be NULL. 1372 * 1373 * @return: A bitmap object on success, or NULL on failure. 1374 */ 1375 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1376 const char *name, 1377 BlockDriverState **pbs, 1378 AioContext **paio, 1379 Error **errp) 1380 { 1381 BlockDriverState *bs; 1382 BdrvDirtyBitmap *bitmap; 1383 AioContext *aio_context; 1384 1385 if (!node) { 1386 error_setg(errp, "Node cannot be NULL"); 1387 return NULL; 1388 } 1389 if (!name) { 1390 error_setg(errp, "Bitmap name cannot be NULL"); 1391 return NULL; 1392 } 1393 bs = bdrv_lookup_bs(node, node, NULL); 1394 if (!bs) { 1395 error_setg(errp, "Node '%s' not found", node); 1396 return NULL; 1397 } 1398 1399 aio_context = bdrv_get_aio_context(bs); 1400 aio_context_acquire(aio_context); 1401 1402 bitmap = bdrv_find_dirty_bitmap(bs, name); 1403 if (!bitmap) { 1404 error_setg(errp, "Dirty bitmap '%s' not found", name); 1405 goto fail; 1406 } 1407 1408 if (pbs) { 1409 *pbs = bs; 1410 } 1411 if (paio) { 1412 *paio = aio_context; 1413 } else { 1414 aio_context_release(aio_context); 1415 } 1416 1417 return bitmap; 1418 1419 fail: 1420 aio_context_release(aio_context); 1421 return NULL; 1422 } 1423 1424 /* New and old BlockDriverState structs for atomic group operations */ 1425 1426 typedef struct BlkActionState BlkActionState; 1427 1428 /** 1429 * BlkActionOps: 1430 * Table of operations that define an Action. 1431 * 1432 * @instance_size: Size of state struct, in bytes. 1433 * @prepare: Prepare the work, must NOT be NULL. 1434 * @commit: Commit the changes, can be NULL. 1435 * @abort: Abort the changes on fail, can be NULL. 1436 * @clean: Clean up resources after all transaction actions have called 1437 * commit() or abort(). Can be NULL. 1438 * 1439 * Only prepare() may fail. In a single transaction, only one of commit() or 1440 * abort() will be called. clean() will always be called if it is present. 1441 */ 1442 typedef struct BlkActionOps { 1443 size_t instance_size; 1444 void (*prepare)(BlkActionState *common, Error **errp); 1445 void (*commit)(BlkActionState *common); 1446 void (*abort)(BlkActionState *common); 1447 void (*clean)(BlkActionState *common); 1448 } BlkActionOps; 1449 1450 /** 1451 * BlkActionState: 1452 * Describes one Action's state within a Transaction. 1453 * 1454 * @action: QAPI-defined enum identifying which Action to perform. 1455 * @ops: Table of ActionOps this Action can perform. 1456 * @block_job_txn: Transaction which this action belongs to. 1457 * @entry: List membership for all Actions in this Transaction. 1458 * 1459 * This structure must be arranged as first member in a subclassed type, 1460 * assuming that the compiler will also arrange it to the same offsets as the 1461 * base class. 1462 */ 1463 struct BlkActionState { 1464 TransactionAction *action; 1465 const BlkActionOps *ops; 1466 BlockJobTxn *block_job_txn; 1467 TransactionProperties *txn_props; 1468 QSIMPLEQ_ENTRY(BlkActionState) entry; 1469 }; 1470 1471 /* internal snapshot private data */ 1472 typedef struct InternalSnapshotState { 1473 BlkActionState common; 1474 BlockDriverState *bs; 1475 AioContext *aio_context; 1476 QEMUSnapshotInfo sn; 1477 bool created; 1478 } InternalSnapshotState; 1479 1480 1481 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1482 { 1483 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1484 error_setg(errp, 1485 "Action '%s' does not support Transaction property " 1486 "completion-mode = %s", 1487 TransactionActionKind_lookup[s->action->type], 1488 ActionCompletionMode_lookup[s->txn_props->completion_mode]); 1489 return -1; 1490 } 1491 return 0; 1492 } 1493 1494 static void internal_snapshot_prepare(BlkActionState *common, 1495 Error **errp) 1496 { 1497 Error *local_err = NULL; 1498 const char *device; 1499 const char *name; 1500 BlockBackend *blk; 1501 BlockDriverState *bs; 1502 QEMUSnapshotInfo old_sn, *sn; 1503 bool ret; 1504 qemu_timeval tv; 1505 BlockdevSnapshotInternal *internal; 1506 InternalSnapshotState *state; 1507 int ret1; 1508 1509 g_assert(common->action->type == 1510 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1511 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1512 state = DO_UPCAST(InternalSnapshotState, common, common); 1513 1514 /* 1. parse input */ 1515 device = internal->device; 1516 name = internal->name; 1517 1518 /* 2. check for validation */ 1519 if (action_check_completion_mode(common, errp) < 0) { 1520 return; 1521 } 1522 1523 blk = blk_by_name(device); 1524 if (!blk) { 1525 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1526 "Device '%s' not found", device); 1527 return; 1528 } 1529 1530 /* AioContext is released in .clean() */ 1531 state->aio_context = blk_get_aio_context(blk); 1532 aio_context_acquire(state->aio_context); 1533 1534 if (!blk_is_available(blk)) { 1535 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1536 return; 1537 } 1538 bs = blk_bs(blk); 1539 1540 state->bs = bs; 1541 bdrv_drained_begin(bs); 1542 1543 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1544 return; 1545 } 1546 1547 if (bdrv_is_read_only(bs)) { 1548 error_setg(errp, "Device '%s' is read only", device); 1549 return; 1550 } 1551 1552 if (!bdrv_can_snapshot(bs)) { 1553 error_setg(errp, "Block format '%s' used by device '%s' " 1554 "does not support internal snapshots", 1555 bs->drv->format_name, device); 1556 return; 1557 } 1558 1559 if (!strlen(name)) { 1560 error_setg(errp, "Name is empty"); 1561 return; 1562 } 1563 1564 /* check whether a snapshot with name exist */ 1565 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1566 &local_err); 1567 if (local_err) { 1568 error_propagate(errp, local_err); 1569 return; 1570 } else if (ret) { 1571 error_setg(errp, 1572 "Snapshot with name '%s' already exists on device '%s'", 1573 name, device); 1574 return; 1575 } 1576 1577 /* 3. take the snapshot */ 1578 sn = &state->sn; 1579 pstrcpy(sn->name, sizeof(sn->name), name); 1580 qemu_gettimeofday(&tv); 1581 sn->date_sec = tv.tv_sec; 1582 sn->date_nsec = tv.tv_usec * 1000; 1583 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1584 1585 ret1 = bdrv_snapshot_create(bs, sn); 1586 if (ret1 < 0) { 1587 error_setg_errno(errp, -ret1, 1588 "Failed to create snapshot '%s' on device '%s'", 1589 name, device); 1590 return; 1591 } 1592 1593 /* 4. succeed, mark a snapshot is created */ 1594 state->created = true; 1595 } 1596 1597 static void internal_snapshot_abort(BlkActionState *common) 1598 { 1599 InternalSnapshotState *state = 1600 DO_UPCAST(InternalSnapshotState, common, common); 1601 BlockDriverState *bs = state->bs; 1602 QEMUSnapshotInfo *sn = &state->sn; 1603 Error *local_error = NULL; 1604 1605 if (!state->created) { 1606 return; 1607 } 1608 1609 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1610 error_reportf_err(local_error, 1611 "Failed to delete snapshot with id '%s' and " 1612 "name '%s' on device '%s' in abort: ", 1613 sn->id_str, sn->name, 1614 bdrv_get_device_name(bs)); 1615 } 1616 } 1617 1618 static void internal_snapshot_clean(BlkActionState *common) 1619 { 1620 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1621 common, common); 1622 1623 if (state->aio_context) { 1624 if (state->bs) { 1625 bdrv_drained_end(state->bs); 1626 } 1627 aio_context_release(state->aio_context); 1628 } 1629 } 1630 1631 /* external snapshot private data */ 1632 typedef struct ExternalSnapshotState { 1633 BlkActionState common; 1634 BlockDriverState *old_bs; 1635 BlockDriverState *new_bs; 1636 AioContext *aio_context; 1637 } ExternalSnapshotState; 1638 1639 static void external_snapshot_prepare(BlkActionState *common, 1640 Error **errp) 1641 { 1642 int flags = 0; 1643 QDict *options = NULL; 1644 Error *local_err = NULL; 1645 /* Device and node name of the image to generate the snapshot from */ 1646 const char *device; 1647 const char *node_name; 1648 /* Reference to the new image (for 'blockdev-snapshot') */ 1649 const char *snapshot_ref; 1650 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1651 const char *new_image_file; 1652 ExternalSnapshotState *state = 1653 DO_UPCAST(ExternalSnapshotState, common, common); 1654 TransactionAction *action = common->action; 1655 1656 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1657 * purpose but a different set of parameters */ 1658 switch (action->type) { 1659 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1660 { 1661 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1662 device = s->node; 1663 node_name = s->node; 1664 new_image_file = NULL; 1665 snapshot_ref = s->overlay; 1666 } 1667 break; 1668 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1669 { 1670 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1671 device = s->has_device ? s->device : NULL; 1672 node_name = s->has_node_name ? s->node_name : NULL; 1673 new_image_file = s->snapshot_file; 1674 snapshot_ref = NULL; 1675 } 1676 break; 1677 default: 1678 g_assert_not_reached(); 1679 } 1680 1681 /* start processing */ 1682 if (action_check_completion_mode(common, errp) < 0) { 1683 return; 1684 } 1685 1686 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1687 if (!state->old_bs) { 1688 return; 1689 } 1690 1691 /* Acquire AioContext now so any threads operating on old_bs stop */ 1692 state->aio_context = bdrv_get_aio_context(state->old_bs); 1693 aio_context_acquire(state->aio_context); 1694 bdrv_drained_begin(state->old_bs); 1695 1696 if (!bdrv_is_inserted(state->old_bs)) { 1697 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1698 return; 1699 } 1700 1701 if (bdrv_op_is_blocked(state->old_bs, 1702 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1703 return; 1704 } 1705 1706 if (!bdrv_is_read_only(state->old_bs)) { 1707 if (bdrv_flush(state->old_bs)) { 1708 error_setg(errp, QERR_IO_ERROR); 1709 return; 1710 } 1711 } 1712 1713 if (!bdrv_is_first_non_filter(state->old_bs)) { 1714 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1715 return; 1716 } 1717 1718 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1719 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1720 const char *format = s->has_format ? s->format : "qcow2"; 1721 enum NewImageMode mode; 1722 const char *snapshot_node_name = 1723 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1724 1725 if (node_name && !snapshot_node_name) { 1726 error_setg(errp, "New snapshot node name missing"); 1727 return; 1728 } 1729 1730 if (snapshot_node_name && 1731 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1732 error_setg(errp, "New snapshot node name already in use"); 1733 return; 1734 } 1735 1736 flags = state->old_bs->open_flags; 1737 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); 1738 1739 /* create new image w/backing file */ 1740 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1741 if (mode != NEW_IMAGE_MODE_EXISTING) { 1742 int64_t size = bdrv_getlength(state->old_bs); 1743 if (size < 0) { 1744 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1745 return; 1746 } 1747 bdrv_img_create(new_image_file, format, 1748 state->old_bs->filename, 1749 state->old_bs->drv->format_name, 1750 NULL, size, flags, &local_err, false); 1751 if (local_err) { 1752 error_propagate(errp, local_err); 1753 return; 1754 } 1755 } 1756 1757 options = qdict_new(); 1758 if (s->has_snapshot_node_name) { 1759 qdict_put(options, "node-name", 1760 qstring_from_str(snapshot_node_name)); 1761 } 1762 qdict_put(options, "driver", qstring_from_str(format)); 1763 1764 flags |= BDRV_O_NO_BACKING; 1765 } 1766 1767 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1768 errp); 1769 /* We will manually add the backing_hd field to the bs later */ 1770 if (!state->new_bs) { 1771 return; 1772 } 1773 1774 if (bdrv_has_blk(state->new_bs)) { 1775 error_setg(errp, "The snapshot is already in use by %s", 1776 bdrv_get_parent_name(state->new_bs)); 1777 return; 1778 } 1779 1780 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1781 errp)) { 1782 return; 1783 } 1784 1785 if (state->new_bs->backing != NULL) { 1786 error_setg(errp, "The snapshot already has a backing image"); 1787 return; 1788 } 1789 1790 if (!state->new_bs->drv->supports_backing) { 1791 error_setg(errp, "The snapshot does not support backing images"); 1792 } 1793 } 1794 1795 static void external_snapshot_commit(BlkActionState *common) 1796 { 1797 ExternalSnapshotState *state = 1798 DO_UPCAST(ExternalSnapshotState, common, common); 1799 1800 bdrv_set_aio_context(state->new_bs, state->aio_context); 1801 1802 /* This removes our old bs and adds the new bs */ 1803 bdrv_append(state->new_bs, state->old_bs); 1804 /* We don't need (or want) to use the transactional 1805 * bdrv_reopen_multiple() across all the entries at once, because we 1806 * don't want to abort all of them if one of them fails the reopen */ 1807 if (!state->old_bs->copy_on_read) { 1808 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR, 1809 NULL); 1810 } 1811 } 1812 1813 static void external_snapshot_abort(BlkActionState *common) 1814 { 1815 ExternalSnapshotState *state = 1816 DO_UPCAST(ExternalSnapshotState, common, common); 1817 if (state->new_bs) { 1818 bdrv_unref(state->new_bs); 1819 } 1820 } 1821 1822 static void external_snapshot_clean(BlkActionState *common) 1823 { 1824 ExternalSnapshotState *state = 1825 DO_UPCAST(ExternalSnapshotState, common, common); 1826 if (state->aio_context) { 1827 bdrv_drained_end(state->old_bs); 1828 aio_context_release(state->aio_context); 1829 } 1830 } 1831 1832 typedef struct DriveBackupState { 1833 BlkActionState common; 1834 BlockDriverState *bs; 1835 AioContext *aio_context; 1836 BlockJob *job; 1837 } DriveBackupState; 1838 1839 static void do_drive_backup(const char *device, const char *target, 1840 bool has_format, const char *format, 1841 enum MirrorSyncMode sync, 1842 bool has_mode, enum NewImageMode mode, 1843 bool has_speed, int64_t speed, 1844 bool has_bitmap, const char *bitmap, 1845 bool has_on_source_error, 1846 BlockdevOnError on_source_error, 1847 bool has_on_target_error, 1848 BlockdevOnError on_target_error, 1849 BlockJobTxn *txn, Error **errp); 1850 1851 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1852 { 1853 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1854 BlockBackend *blk; 1855 DriveBackup *backup; 1856 Error *local_err = NULL; 1857 1858 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1859 backup = common->action->u.drive_backup.data; 1860 1861 blk = blk_by_name(backup->device); 1862 if (!blk) { 1863 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1864 "Device '%s' not found", backup->device); 1865 return; 1866 } 1867 1868 if (!blk_is_available(blk)) { 1869 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device); 1870 return; 1871 } 1872 1873 /* AioContext is released in .clean() */ 1874 state->aio_context = blk_get_aio_context(blk); 1875 aio_context_acquire(state->aio_context); 1876 bdrv_drained_begin(blk_bs(blk)); 1877 state->bs = blk_bs(blk); 1878 1879 do_drive_backup(backup->device, backup->target, 1880 backup->has_format, backup->format, 1881 backup->sync, 1882 backup->has_mode, backup->mode, 1883 backup->has_speed, backup->speed, 1884 backup->has_bitmap, backup->bitmap, 1885 backup->has_on_source_error, backup->on_source_error, 1886 backup->has_on_target_error, backup->on_target_error, 1887 common->block_job_txn, &local_err); 1888 if (local_err) { 1889 error_propagate(errp, local_err); 1890 return; 1891 } 1892 1893 state->job = state->bs->job; 1894 } 1895 1896 static void drive_backup_abort(BlkActionState *common) 1897 { 1898 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1899 BlockDriverState *bs = state->bs; 1900 1901 /* Only cancel if it's the job we started */ 1902 if (bs && bs->job && bs->job == state->job) { 1903 block_job_cancel_sync(bs->job); 1904 } 1905 } 1906 1907 static void drive_backup_clean(BlkActionState *common) 1908 { 1909 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1910 1911 if (state->aio_context) { 1912 bdrv_drained_end(state->bs); 1913 aio_context_release(state->aio_context); 1914 } 1915 } 1916 1917 typedef struct BlockdevBackupState { 1918 BlkActionState common; 1919 BlockDriverState *bs; 1920 BlockJob *job; 1921 AioContext *aio_context; 1922 } BlockdevBackupState; 1923 1924 static void do_blockdev_backup(const char *device, const char *target, 1925 enum MirrorSyncMode sync, 1926 bool has_speed, int64_t speed, 1927 bool has_on_source_error, 1928 BlockdevOnError on_source_error, 1929 bool has_on_target_error, 1930 BlockdevOnError on_target_error, 1931 BlockJobTxn *txn, Error **errp); 1932 1933 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1934 { 1935 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1936 BlockdevBackup *backup; 1937 BlockBackend *blk, *target; 1938 Error *local_err = NULL; 1939 1940 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1941 backup = common->action->u.blockdev_backup.data; 1942 1943 blk = blk_by_name(backup->device); 1944 if (!blk) { 1945 error_setg(errp, "Device '%s' not found", backup->device); 1946 return; 1947 } 1948 1949 if (!blk_is_available(blk)) { 1950 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device); 1951 return; 1952 } 1953 1954 target = blk_by_name(backup->target); 1955 if (!target) { 1956 error_setg(errp, "Device '%s' not found", backup->target); 1957 return; 1958 } 1959 1960 /* AioContext is released in .clean() */ 1961 state->aio_context = blk_get_aio_context(blk); 1962 if (state->aio_context != blk_get_aio_context(target)) { 1963 state->aio_context = NULL; 1964 error_setg(errp, "Backup between two IO threads is not implemented"); 1965 return; 1966 } 1967 aio_context_acquire(state->aio_context); 1968 state->bs = blk_bs(blk); 1969 bdrv_drained_begin(state->bs); 1970 1971 do_blockdev_backup(backup->device, backup->target, 1972 backup->sync, 1973 backup->has_speed, backup->speed, 1974 backup->has_on_source_error, backup->on_source_error, 1975 backup->has_on_target_error, backup->on_target_error, 1976 common->block_job_txn, &local_err); 1977 if (local_err) { 1978 error_propagate(errp, local_err); 1979 return; 1980 } 1981 1982 state->job = state->bs->job; 1983 } 1984 1985 static void blockdev_backup_abort(BlkActionState *common) 1986 { 1987 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1988 BlockDriverState *bs = state->bs; 1989 1990 /* Only cancel if it's the job we started */ 1991 if (bs && bs->job && bs->job == state->job) { 1992 block_job_cancel_sync(bs->job); 1993 } 1994 } 1995 1996 static void blockdev_backup_clean(BlkActionState *common) 1997 { 1998 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1999 2000 if (state->aio_context) { 2001 bdrv_drained_end(state->bs); 2002 aio_context_release(state->aio_context); 2003 } 2004 } 2005 2006 typedef struct BlockDirtyBitmapState { 2007 BlkActionState common; 2008 BdrvDirtyBitmap *bitmap; 2009 BlockDriverState *bs; 2010 AioContext *aio_context; 2011 HBitmap *backup; 2012 bool prepared; 2013 } BlockDirtyBitmapState; 2014 2015 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 2016 Error **errp) 2017 { 2018 Error *local_err = NULL; 2019 BlockDirtyBitmapAdd *action; 2020 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2021 common, common); 2022 2023 if (action_check_completion_mode(common, errp) < 0) { 2024 return; 2025 } 2026 2027 action = common->action->u.block_dirty_bitmap_add.data; 2028 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 2029 qmp_block_dirty_bitmap_add(action->node, action->name, 2030 action->has_granularity, action->granularity, 2031 &local_err); 2032 2033 if (!local_err) { 2034 state->prepared = true; 2035 } else { 2036 error_propagate(errp, local_err); 2037 } 2038 } 2039 2040 static void block_dirty_bitmap_add_abort(BlkActionState *common) 2041 { 2042 BlockDirtyBitmapAdd *action; 2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2044 common, common); 2045 2046 action = common->action->u.block_dirty_bitmap_add.data; 2047 /* Should not be able to fail: IF the bitmap was added via .prepare(), 2048 * then the node reference and bitmap name must have been valid. 2049 */ 2050 if (state->prepared) { 2051 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 2052 } 2053 } 2054 2055 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 2056 Error **errp) 2057 { 2058 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2059 common, common); 2060 BlockDirtyBitmap *action; 2061 2062 if (action_check_completion_mode(common, errp) < 0) { 2063 return; 2064 } 2065 2066 action = common->action->u.block_dirty_bitmap_clear.data; 2067 state->bitmap = block_dirty_bitmap_lookup(action->node, 2068 action->name, 2069 &state->bs, 2070 &state->aio_context, 2071 errp); 2072 if (!state->bitmap) { 2073 return; 2074 } 2075 2076 if (bdrv_dirty_bitmap_frozen(state->bitmap)) { 2077 error_setg(errp, "Cannot modify a frozen bitmap"); 2078 return; 2079 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) { 2080 error_setg(errp, "Cannot clear a disabled bitmap"); 2081 return; 2082 } 2083 2084 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2085 /* AioContext is released in .clean() */ 2086 } 2087 2088 static void block_dirty_bitmap_clear_abort(BlkActionState *common) 2089 { 2090 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2091 common, common); 2092 2093 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup); 2094 } 2095 2096 static void block_dirty_bitmap_clear_commit(BlkActionState *common) 2097 { 2098 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2099 common, common); 2100 2101 hbitmap_free(state->backup); 2102 } 2103 2104 static void block_dirty_bitmap_clear_clean(BlkActionState *common) 2105 { 2106 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2107 common, common); 2108 2109 if (state->aio_context) { 2110 aio_context_release(state->aio_context); 2111 } 2112 } 2113 2114 static void abort_prepare(BlkActionState *common, Error **errp) 2115 { 2116 error_setg(errp, "Transaction aborted using Abort action"); 2117 } 2118 2119 static void abort_commit(BlkActionState *common) 2120 { 2121 g_assert_not_reached(); /* this action never succeeds */ 2122 } 2123 2124 static const BlkActionOps actions[] = { 2125 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2126 .instance_size = sizeof(ExternalSnapshotState), 2127 .prepare = external_snapshot_prepare, 2128 .commit = external_snapshot_commit, 2129 .abort = external_snapshot_abort, 2130 .clean = external_snapshot_clean, 2131 }, 2132 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2133 .instance_size = sizeof(ExternalSnapshotState), 2134 .prepare = external_snapshot_prepare, 2135 .commit = external_snapshot_commit, 2136 .abort = external_snapshot_abort, 2137 .clean = external_snapshot_clean, 2138 }, 2139 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2140 .instance_size = sizeof(DriveBackupState), 2141 .prepare = drive_backup_prepare, 2142 .abort = drive_backup_abort, 2143 .clean = drive_backup_clean, 2144 }, 2145 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2146 .instance_size = sizeof(BlockdevBackupState), 2147 .prepare = blockdev_backup_prepare, 2148 .abort = blockdev_backup_abort, 2149 .clean = blockdev_backup_clean, 2150 }, 2151 [TRANSACTION_ACTION_KIND_ABORT] = { 2152 .instance_size = sizeof(BlkActionState), 2153 .prepare = abort_prepare, 2154 .commit = abort_commit, 2155 }, 2156 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2157 .instance_size = sizeof(InternalSnapshotState), 2158 .prepare = internal_snapshot_prepare, 2159 .abort = internal_snapshot_abort, 2160 .clean = internal_snapshot_clean, 2161 }, 2162 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2163 .instance_size = sizeof(BlockDirtyBitmapState), 2164 .prepare = block_dirty_bitmap_add_prepare, 2165 .abort = block_dirty_bitmap_add_abort, 2166 }, 2167 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2168 .instance_size = sizeof(BlockDirtyBitmapState), 2169 .prepare = block_dirty_bitmap_clear_prepare, 2170 .commit = block_dirty_bitmap_clear_commit, 2171 .abort = block_dirty_bitmap_clear_abort, 2172 .clean = block_dirty_bitmap_clear_clean, 2173 } 2174 }; 2175 2176 /** 2177 * Allocate a TransactionProperties structure if necessary, and fill 2178 * that structure with desired defaults if they are unset. 2179 */ 2180 static TransactionProperties *get_transaction_properties( 2181 TransactionProperties *props) 2182 { 2183 if (!props) { 2184 props = g_new0(TransactionProperties, 1); 2185 } 2186 2187 if (!props->has_completion_mode) { 2188 props->has_completion_mode = true; 2189 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2190 } 2191 2192 return props; 2193 } 2194 2195 /* 2196 * 'Atomic' group operations. The operations are performed as a set, and if 2197 * any fail then we roll back all operations in the group. 2198 */ 2199 void qmp_transaction(TransactionActionList *dev_list, 2200 bool has_props, 2201 struct TransactionProperties *props, 2202 Error **errp) 2203 { 2204 TransactionActionList *dev_entry = dev_list; 2205 BlockJobTxn *block_job_txn = NULL; 2206 BlkActionState *state, *next; 2207 Error *local_err = NULL; 2208 2209 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; 2210 QSIMPLEQ_INIT(&snap_bdrv_states); 2211 2212 /* Does this transaction get canceled as a group on failure? 2213 * If not, we don't really need to make a BlockJobTxn. 2214 */ 2215 props = get_transaction_properties(props); 2216 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2217 block_job_txn = block_job_txn_new(); 2218 } 2219 2220 /* drain all i/o before any operations */ 2221 bdrv_drain_all(); 2222 2223 /* We don't do anything in this loop that commits us to the operations */ 2224 while (NULL != dev_entry) { 2225 TransactionAction *dev_info = NULL; 2226 const BlkActionOps *ops; 2227 2228 dev_info = dev_entry->value; 2229 dev_entry = dev_entry->next; 2230 2231 assert(dev_info->type < ARRAY_SIZE(actions)); 2232 2233 ops = &actions[dev_info->type]; 2234 assert(ops->instance_size > 0); 2235 2236 state = g_malloc0(ops->instance_size); 2237 state->ops = ops; 2238 state->action = dev_info; 2239 state->block_job_txn = block_job_txn; 2240 state->txn_props = props; 2241 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2242 2243 state->ops->prepare(state, &local_err); 2244 if (local_err) { 2245 error_propagate(errp, local_err); 2246 goto delete_and_fail; 2247 } 2248 } 2249 2250 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2251 if (state->ops->commit) { 2252 state->ops->commit(state); 2253 } 2254 } 2255 2256 /* success */ 2257 goto exit; 2258 2259 delete_and_fail: 2260 /* failure, and it is all-or-none; roll back all operations */ 2261 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2262 if (state->ops->abort) { 2263 state->ops->abort(state); 2264 } 2265 } 2266 exit: 2267 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2268 if (state->ops->clean) { 2269 state->ops->clean(state); 2270 } 2271 g_free(state); 2272 } 2273 if (!has_props) { 2274 qapi_free_TransactionProperties(props); 2275 } 2276 block_job_txn_unref(block_job_txn); 2277 } 2278 2279 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 2280 { 2281 Error *local_err = NULL; 2282 int rc; 2283 2284 if (!has_force) { 2285 force = false; 2286 } 2287 2288 rc = do_open_tray(device, force, &local_err); 2289 if (rc && rc != -ENOSYS) { 2290 error_propagate(errp, local_err); 2291 return; 2292 } 2293 error_free(local_err); 2294 2295 qmp_x_blockdev_remove_medium(device, errp); 2296 } 2297 2298 void qmp_block_passwd(bool has_device, const char *device, 2299 bool has_node_name, const char *node_name, 2300 const char *password, Error **errp) 2301 { 2302 Error *local_err = NULL; 2303 BlockDriverState *bs; 2304 AioContext *aio_context; 2305 2306 bs = bdrv_lookup_bs(has_device ? device : NULL, 2307 has_node_name ? node_name : NULL, 2308 &local_err); 2309 if (local_err) { 2310 error_propagate(errp, local_err); 2311 return; 2312 } 2313 2314 aio_context = bdrv_get_aio_context(bs); 2315 aio_context_acquire(aio_context); 2316 2317 bdrv_add_key(bs, password, errp); 2318 2319 aio_context_release(aio_context); 2320 } 2321 2322 /* 2323 * Attempt to open the tray of @device. 2324 * If @force, ignore its tray lock. 2325 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2326 * On error, store an error through @errp and return -errno. 2327 * If @device does not exist, return -ENODEV. 2328 * If it has no removable media, return -ENOTSUP. 2329 * If it has no tray, return -ENOSYS. 2330 * If the guest was asked to open the tray, return -EINPROGRESS. 2331 * Else, return 0. 2332 */ 2333 static int do_open_tray(const char *device, bool force, Error **errp) 2334 { 2335 BlockBackend *blk; 2336 bool locked; 2337 2338 blk = blk_by_name(device); 2339 if (!blk) { 2340 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2341 "Device '%s' not found", device); 2342 return -ENODEV; 2343 } 2344 2345 if (!blk_dev_has_removable_media(blk)) { 2346 error_setg(errp, "Device '%s' is not removable", device); 2347 return -ENOTSUP; 2348 } 2349 2350 if (!blk_dev_has_tray(blk)) { 2351 error_setg(errp, "Device '%s' does not have a tray", device); 2352 return -ENOSYS; 2353 } 2354 2355 if (blk_dev_is_tray_open(blk)) { 2356 return 0; 2357 } 2358 2359 locked = blk_dev_is_medium_locked(blk); 2360 if (locked) { 2361 blk_dev_eject_request(blk, force); 2362 } 2363 2364 if (!locked || force) { 2365 blk_dev_change_media_cb(blk, false); 2366 } 2367 2368 if (locked && !force) { 2369 error_setg(errp, "Device '%s' is locked and force was not specified, " 2370 "wait for tray to open and try again", device); 2371 return -EINPROGRESS; 2372 } 2373 2374 return 0; 2375 } 2376 2377 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force, 2378 Error **errp) 2379 { 2380 Error *local_err = NULL; 2381 int rc; 2382 2383 if (!has_force) { 2384 force = false; 2385 } 2386 rc = do_open_tray(device, force, &local_err); 2387 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2388 error_propagate(errp, local_err); 2389 return; 2390 } 2391 error_free(local_err); 2392 } 2393 2394 void qmp_blockdev_close_tray(const char *device, Error **errp) 2395 { 2396 BlockBackend *blk; 2397 2398 blk = blk_by_name(device); 2399 if (!blk) { 2400 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2401 "Device '%s' not found", device); 2402 return; 2403 } 2404 2405 if (!blk_dev_has_removable_media(blk)) { 2406 error_setg(errp, "Device '%s' is not removable", device); 2407 return; 2408 } 2409 2410 if (!blk_dev_has_tray(blk)) { 2411 /* Ignore this command on tray-less devices */ 2412 return; 2413 } 2414 2415 if (!blk_dev_is_tray_open(blk)) { 2416 return; 2417 } 2418 2419 blk_dev_change_media_cb(blk, true); 2420 } 2421 2422 void qmp_x_blockdev_remove_medium(const char *device, Error **errp) 2423 { 2424 BlockBackend *blk; 2425 BlockDriverState *bs; 2426 AioContext *aio_context; 2427 bool has_device; 2428 2429 blk = blk_by_name(device); 2430 if (!blk) { 2431 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2432 "Device '%s' not found", device); 2433 return; 2434 } 2435 2436 /* For BBs without a device, we can exchange the BDS tree at will */ 2437 has_device = blk_get_attached_dev(blk); 2438 2439 if (has_device && !blk_dev_has_removable_media(blk)) { 2440 error_setg(errp, "Device '%s' is not removable", device); 2441 return; 2442 } 2443 2444 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2445 error_setg(errp, "Tray of device '%s' is not open", device); 2446 return; 2447 } 2448 2449 bs = blk_bs(blk); 2450 if (!bs) { 2451 return; 2452 } 2453 2454 aio_context = bdrv_get_aio_context(bs); 2455 aio_context_acquire(aio_context); 2456 2457 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2458 goto out; 2459 } 2460 2461 blk_remove_bs(blk); 2462 2463 if (!blk_dev_has_tray(blk)) { 2464 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2465 * called at all); therefore, the medium needs to be ejected here. 2466 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2467 * value passed here (i.e. false). */ 2468 blk_dev_change_media_cb(blk, false); 2469 } 2470 2471 out: 2472 aio_context_release(aio_context); 2473 } 2474 2475 static void qmp_blockdev_insert_anon_medium(const char *device, 2476 BlockDriverState *bs, Error **errp) 2477 { 2478 BlockBackend *blk; 2479 bool has_device; 2480 2481 blk = blk_by_name(device); 2482 if (!blk) { 2483 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2484 "Device '%s' not found", device); 2485 return; 2486 } 2487 2488 /* For BBs without a device, we can exchange the BDS tree at will */ 2489 has_device = blk_get_attached_dev(blk); 2490 2491 if (has_device && !blk_dev_has_removable_media(blk)) { 2492 error_setg(errp, "Device '%s' is not removable", device); 2493 return; 2494 } 2495 2496 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2497 error_setg(errp, "Tray of device '%s' is not open", device); 2498 return; 2499 } 2500 2501 if (blk_bs(blk)) { 2502 error_setg(errp, "There already is a medium in device '%s'", device); 2503 return; 2504 } 2505 2506 blk_insert_bs(blk, bs); 2507 2508 if (!blk_dev_has_tray(blk)) { 2509 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2510 * called at all); therefore, the medium needs to be pushed into the 2511 * slot here. 2512 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2513 * value passed here (i.e. true). */ 2514 blk_dev_change_media_cb(blk, true); 2515 } 2516 } 2517 2518 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name, 2519 Error **errp) 2520 { 2521 BlockDriverState *bs; 2522 2523 bs = bdrv_find_node(node_name); 2524 if (!bs) { 2525 error_setg(errp, "Node '%s' not found", node_name); 2526 return; 2527 } 2528 2529 if (bdrv_has_blk(bs)) { 2530 error_setg(errp, "Node '%s' is already in use by '%s'", node_name, 2531 bdrv_get_parent_name(bs)); 2532 return; 2533 } 2534 2535 qmp_blockdev_insert_anon_medium(device, bs, errp); 2536 } 2537 2538 void qmp_blockdev_change_medium(const char *device, const char *filename, 2539 bool has_format, const char *format, 2540 bool has_read_only, 2541 BlockdevChangeReadOnlyMode read_only, 2542 Error **errp) 2543 { 2544 BlockBackend *blk; 2545 BlockDriverState *medium_bs = NULL; 2546 int bdrv_flags; 2547 int rc; 2548 QDict *options = NULL; 2549 Error *err = NULL; 2550 2551 blk = blk_by_name(device); 2552 if (!blk) { 2553 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2554 "Device '%s' not found", device); 2555 goto fail; 2556 } 2557 2558 if (blk_bs(blk)) { 2559 blk_update_root_state(blk); 2560 } 2561 2562 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2563 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2564 BDRV_O_PROTOCOL); 2565 2566 if (!has_read_only) { 2567 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2568 } 2569 2570 switch (read_only) { 2571 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2572 break; 2573 2574 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2575 bdrv_flags &= ~BDRV_O_RDWR; 2576 break; 2577 2578 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2579 bdrv_flags |= BDRV_O_RDWR; 2580 break; 2581 2582 default: 2583 abort(); 2584 } 2585 2586 if (has_format) { 2587 options = qdict_new(); 2588 qdict_put(options, "driver", qstring_from_str(format)); 2589 } 2590 2591 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2592 if (!medium_bs) { 2593 goto fail; 2594 } 2595 2596 bdrv_add_key(medium_bs, NULL, &err); 2597 if (err) { 2598 error_propagate(errp, err); 2599 goto fail; 2600 } 2601 2602 rc = do_open_tray(device, false, &err); 2603 if (rc && rc != -ENOSYS) { 2604 error_propagate(errp, err); 2605 goto fail; 2606 } 2607 error_free(err); 2608 err = NULL; 2609 2610 qmp_x_blockdev_remove_medium(device, &err); 2611 if (err) { 2612 error_propagate(errp, err); 2613 goto fail; 2614 } 2615 2616 qmp_blockdev_insert_anon_medium(device, medium_bs, &err); 2617 if (err) { 2618 error_propagate(errp, err); 2619 goto fail; 2620 } 2621 2622 blk_apply_root_state(blk, medium_bs); 2623 2624 qmp_blockdev_close_tray(device, errp); 2625 2626 fail: 2627 /* If the medium has been inserted, the device has its own reference, so 2628 * ours must be relinquished; and if it has not been inserted successfully, 2629 * the reference must be relinquished anyway */ 2630 bdrv_unref(medium_bs); 2631 } 2632 2633 /* throttling disk I/O limits */ 2634 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 2635 int64_t bps_wr, 2636 int64_t iops, 2637 int64_t iops_rd, 2638 int64_t iops_wr, 2639 bool has_bps_max, 2640 int64_t bps_max, 2641 bool has_bps_rd_max, 2642 int64_t bps_rd_max, 2643 bool has_bps_wr_max, 2644 int64_t bps_wr_max, 2645 bool has_iops_max, 2646 int64_t iops_max, 2647 bool has_iops_rd_max, 2648 int64_t iops_rd_max, 2649 bool has_iops_wr_max, 2650 int64_t iops_wr_max, 2651 bool has_bps_max_length, 2652 int64_t bps_max_length, 2653 bool has_bps_rd_max_length, 2654 int64_t bps_rd_max_length, 2655 bool has_bps_wr_max_length, 2656 int64_t bps_wr_max_length, 2657 bool has_iops_max_length, 2658 int64_t iops_max_length, 2659 bool has_iops_rd_max_length, 2660 int64_t iops_rd_max_length, 2661 bool has_iops_wr_max_length, 2662 int64_t iops_wr_max_length, 2663 bool has_iops_size, 2664 int64_t iops_size, 2665 bool has_group, 2666 const char *group, Error **errp) 2667 { 2668 ThrottleConfig cfg; 2669 BlockDriverState *bs; 2670 BlockBackend *blk; 2671 AioContext *aio_context; 2672 2673 blk = blk_by_name(device); 2674 if (!blk) { 2675 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2676 "Device '%s' not found", device); 2677 return; 2678 } 2679 2680 aio_context = blk_get_aio_context(blk); 2681 aio_context_acquire(aio_context); 2682 2683 bs = blk_bs(blk); 2684 if (!bs) { 2685 error_setg(errp, "Device '%s' has no medium", device); 2686 goto out; 2687 } 2688 2689 throttle_config_init(&cfg); 2690 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 2691 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 2692 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 2693 2694 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 2695 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 2696 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 2697 2698 if (has_bps_max) { 2699 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 2700 } 2701 if (has_bps_rd_max) { 2702 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 2703 } 2704 if (has_bps_wr_max) { 2705 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 2706 } 2707 if (has_iops_max) { 2708 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 2709 } 2710 if (has_iops_rd_max) { 2711 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 2712 } 2713 if (has_iops_wr_max) { 2714 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 2715 } 2716 2717 if (has_bps_max_length) { 2718 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = bps_max_length; 2719 } 2720 if (has_bps_rd_max_length) { 2721 cfg.buckets[THROTTLE_BPS_READ].burst_length = bps_rd_max_length; 2722 } 2723 if (has_bps_wr_max_length) { 2724 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = bps_wr_max_length; 2725 } 2726 if (has_iops_max_length) { 2727 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = iops_max_length; 2728 } 2729 if (has_iops_rd_max_length) { 2730 cfg.buckets[THROTTLE_OPS_READ].burst_length = iops_rd_max_length; 2731 } 2732 if (has_iops_wr_max_length) { 2733 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = iops_wr_max_length; 2734 } 2735 2736 if (has_iops_size) { 2737 cfg.op_size = iops_size; 2738 } 2739 2740 if (!throttle_is_valid(&cfg, errp)) { 2741 goto out; 2742 } 2743 2744 if (throttle_enabled(&cfg)) { 2745 /* Enable I/O limits if they're not enabled yet, otherwise 2746 * just update the throttling group. */ 2747 if (!blk_get_public(blk)->throttle_state) { 2748 blk_io_limits_enable(blk, has_group ? group : device); 2749 } else if (has_group) { 2750 blk_io_limits_update_group(blk, group); 2751 } 2752 /* Set the new throttling configuration */ 2753 blk_set_io_limits(blk, &cfg); 2754 } else if (blk_get_public(blk)->throttle_state) { 2755 /* If all throttling settings are set to 0, disable I/O limits */ 2756 blk_io_limits_disable(blk); 2757 } 2758 2759 out: 2760 aio_context_release(aio_context); 2761 } 2762 2763 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2764 bool has_granularity, uint32_t granularity, 2765 Error **errp) 2766 { 2767 AioContext *aio_context; 2768 BlockDriverState *bs; 2769 2770 if (!name || name[0] == '\0') { 2771 error_setg(errp, "Bitmap name cannot be empty"); 2772 return; 2773 } 2774 2775 bs = bdrv_lookup_bs(node, node, errp); 2776 if (!bs) { 2777 return; 2778 } 2779 2780 aio_context = bdrv_get_aio_context(bs); 2781 aio_context_acquire(aio_context); 2782 2783 if (has_granularity) { 2784 if (granularity < 512 || !is_power_of_2(granularity)) { 2785 error_setg(errp, "Granularity must be power of 2 " 2786 "and at least 512"); 2787 goto out; 2788 } 2789 } else { 2790 /* Default to cluster size, if available: */ 2791 granularity = bdrv_get_default_bitmap_granularity(bs); 2792 } 2793 2794 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2795 2796 out: 2797 aio_context_release(aio_context); 2798 } 2799 2800 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2801 Error **errp) 2802 { 2803 AioContext *aio_context; 2804 BlockDriverState *bs; 2805 BdrvDirtyBitmap *bitmap; 2806 2807 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2808 if (!bitmap || !bs) { 2809 return; 2810 } 2811 2812 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2813 error_setg(errp, 2814 "Bitmap '%s' is currently frozen and cannot be removed", 2815 name); 2816 goto out; 2817 } 2818 bdrv_dirty_bitmap_make_anon(bitmap); 2819 bdrv_release_dirty_bitmap(bs, bitmap); 2820 2821 out: 2822 aio_context_release(aio_context); 2823 } 2824 2825 /** 2826 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2827 * immediately after a full backup operation. 2828 */ 2829 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2830 Error **errp) 2831 { 2832 AioContext *aio_context; 2833 BdrvDirtyBitmap *bitmap; 2834 BlockDriverState *bs; 2835 2836 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2837 if (!bitmap || !bs) { 2838 return; 2839 } 2840 2841 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2842 error_setg(errp, 2843 "Bitmap '%s' is currently frozen and cannot be modified", 2844 name); 2845 goto out; 2846 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2847 error_setg(errp, 2848 "Bitmap '%s' is currently disabled and cannot be cleared", 2849 name); 2850 goto out; 2851 } 2852 2853 bdrv_clear_dirty_bitmap(bitmap, NULL); 2854 2855 out: 2856 aio_context_release(aio_context); 2857 } 2858 2859 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2860 { 2861 const char *id = qdict_get_str(qdict, "id"); 2862 BlockBackend *blk; 2863 BlockDriverState *bs; 2864 AioContext *aio_context; 2865 Error *local_err = NULL; 2866 2867 bs = bdrv_find_node(id); 2868 if (bs) { 2869 qmp_x_blockdev_del(false, NULL, true, id, &local_err); 2870 if (local_err) { 2871 error_report_err(local_err); 2872 } 2873 return; 2874 } 2875 2876 blk = blk_by_name(id); 2877 if (!blk) { 2878 error_report("Device '%s' not found", id); 2879 return; 2880 } 2881 2882 if (!blk_legacy_dinfo(blk)) { 2883 error_report("Deleting device added with blockdev-add" 2884 " is not supported"); 2885 return; 2886 } 2887 2888 aio_context = blk_get_aio_context(blk); 2889 aio_context_acquire(aio_context); 2890 2891 bs = blk_bs(blk); 2892 if (bs) { 2893 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2894 error_report_err(local_err); 2895 aio_context_release(aio_context); 2896 return; 2897 } 2898 2899 blk_remove_bs(blk); 2900 } 2901 2902 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 2903 monitor_remove_blk(blk); 2904 2905 /* If this BlockBackend has a device attached to it, its refcount will be 2906 * decremented when the device is removed; otherwise we have to do so here. 2907 */ 2908 if (blk_get_attached_dev(blk)) { 2909 /* Further I/O must not pause the guest */ 2910 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 2911 BLOCKDEV_ON_ERROR_REPORT); 2912 } else { 2913 blk_unref(blk); 2914 } 2915 2916 aio_context_release(aio_context); 2917 } 2918 2919 void qmp_block_resize(bool has_device, const char *device, 2920 bool has_node_name, const char *node_name, 2921 int64_t size, Error **errp) 2922 { 2923 Error *local_err = NULL; 2924 BlockDriverState *bs; 2925 AioContext *aio_context; 2926 int ret; 2927 2928 bs = bdrv_lookup_bs(has_device ? device : NULL, 2929 has_node_name ? node_name : NULL, 2930 &local_err); 2931 if (local_err) { 2932 error_propagate(errp, local_err); 2933 return; 2934 } 2935 2936 aio_context = bdrv_get_aio_context(bs); 2937 aio_context_acquire(aio_context); 2938 2939 if (!bdrv_is_first_non_filter(bs)) { 2940 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 2941 goto out; 2942 } 2943 2944 if (size < 0) { 2945 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2946 goto out; 2947 } 2948 2949 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2950 error_setg(errp, QERR_DEVICE_IN_USE, device); 2951 goto out; 2952 } 2953 2954 /* complete all in-flight operations before resizing the device */ 2955 bdrv_drain_all(); 2956 2957 ret = bdrv_truncate(bs, size); 2958 switch (ret) { 2959 case 0: 2960 break; 2961 case -ENOMEDIUM: 2962 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2963 break; 2964 case -ENOTSUP: 2965 error_setg(errp, QERR_UNSUPPORTED); 2966 break; 2967 case -EACCES: 2968 error_setg(errp, "Device '%s' is read only", device); 2969 break; 2970 case -EBUSY: 2971 error_setg(errp, QERR_DEVICE_IN_USE, device); 2972 break; 2973 default: 2974 error_setg_errno(errp, -ret, "Could not resize"); 2975 break; 2976 } 2977 2978 out: 2979 aio_context_release(aio_context); 2980 } 2981 2982 static void block_job_cb(void *opaque, int ret) 2983 { 2984 /* Note that this function may be executed from another AioContext besides 2985 * the QEMU main loop. If you need to access anything that assumes the 2986 * QEMU global mutex, use a BH or introduce a mutex. 2987 */ 2988 2989 BlockDriverState *bs = opaque; 2990 const char *msg = NULL; 2991 2992 trace_block_job_cb(bs, bs->job, ret); 2993 2994 assert(bs->job); 2995 2996 if (ret < 0) { 2997 msg = strerror(-ret); 2998 } 2999 3000 if (block_job_is_cancelled(bs->job)) { 3001 block_job_event_cancelled(bs->job); 3002 } else { 3003 block_job_event_completed(bs->job, msg); 3004 } 3005 } 3006 3007 void qmp_block_stream(const char *device, 3008 bool has_base, const char *base, 3009 bool has_backing_file, const char *backing_file, 3010 bool has_speed, int64_t speed, 3011 bool has_on_error, BlockdevOnError on_error, 3012 Error **errp) 3013 { 3014 BlockBackend *blk; 3015 BlockDriverState *bs; 3016 BlockDriverState *base_bs = NULL; 3017 AioContext *aio_context; 3018 Error *local_err = NULL; 3019 const char *base_name = NULL; 3020 3021 if (!has_on_error) { 3022 on_error = BLOCKDEV_ON_ERROR_REPORT; 3023 } 3024 3025 blk = blk_by_name(device); 3026 if (!blk) { 3027 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3028 "Device '%s' not found", device); 3029 return; 3030 } 3031 3032 aio_context = blk_get_aio_context(blk); 3033 aio_context_acquire(aio_context); 3034 3035 if (!blk_is_available(blk)) { 3036 error_setg(errp, "Device '%s' has no medium", device); 3037 goto out; 3038 } 3039 bs = blk_bs(blk); 3040 3041 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 3042 goto out; 3043 } 3044 3045 if (has_base) { 3046 base_bs = bdrv_find_backing_image(bs, base); 3047 if (base_bs == NULL) { 3048 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3049 goto out; 3050 } 3051 assert(bdrv_get_aio_context(base_bs) == aio_context); 3052 base_name = base; 3053 } 3054 3055 /* if we are streaming the entire chain, the result will have no backing 3056 * file, and specifying one is therefore an error */ 3057 if (base_bs == NULL && has_backing_file) { 3058 error_setg(errp, "backing file specified, but streaming the " 3059 "entire chain"); 3060 goto out; 3061 } 3062 3063 /* backing_file string overrides base bs filename */ 3064 base_name = has_backing_file ? backing_file : base_name; 3065 3066 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 3067 on_error, block_job_cb, bs, &local_err); 3068 if (local_err) { 3069 error_propagate(errp, local_err); 3070 goto out; 3071 } 3072 3073 trace_qmp_block_stream(bs, bs->job); 3074 3075 out: 3076 aio_context_release(aio_context); 3077 } 3078 3079 void qmp_block_commit(const char *device, 3080 bool has_base, const char *base, 3081 bool has_top, const char *top, 3082 bool has_backing_file, const char *backing_file, 3083 bool has_speed, int64_t speed, 3084 Error **errp) 3085 { 3086 BlockBackend *blk; 3087 BlockDriverState *bs; 3088 BlockDriverState *base_bs, *top_bs; 3089 AioContext *aio_context; 3090 Error *local_err = NULL; 3091 /* This will be part of the QMP command, if/when the 3092 * BlockdevOnError change for blkmirror makes it in 3093 */ 3094 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3095 3096 if (!has_speed) { 3097 speed = 0; 3098 } 3099 3100 /* Important Note: 3101 * libvirt relies on the DeviceNotFound error class in order to probe for 3102 * live commit feature versions; for this to work, we must make sure to 3103 * perform the device lookup before any generic errors that may occur in a 3104 * scenario in which all optional arguments are omitted. */ 3105 blk = blk_by_name(device); 3106 if (!blk) { 3107 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3108 "Device '%s' not found", device); 3109 return; 3110 } 3111 3112 aio_context = blk_get_aio_context(blk); 3113 aio_context_acquire(aio_context); 3114 3115 if (!blk_is_available(blk)) { 3116 error_setg(errp, "Device '%s' has no medium", device); 3117 goto out; 3118 } 3119 bs = blk_bs(blk); 3120 3121 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3122 goto out; 3123 } 3124 3125 /* default top_bs is the active layer */ 3126 top_bs = bs; 3127 3128 if (has_top && top) { 3129 if (strcmp(bs->filename, top) != 0) { 3130 top_bs = bdrv_find_backing_image(bs, top); 3131 } 3132 } 3133 3134 if (top_bs == NULL) { 3135 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3136 goto out; 3137 } 3138 3139 assert(bdrv_get_aio_context(top_bs) == aio_context); 3140 3141 if (has_base && base) { 3142 base_bs = bdrv_find_backing_image(top_bs, base); 3143 } else { 3144 base_bs = bdrv_find_base(top_bs); 3145 } 3146 3147 if (base_bs == NULL) { 3148 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3149 goto out; 3150 } 3151 3152 assert(bdrv_get_aio_context(base_bs) == aio_context); 3153 3154 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3155 goto out; 3156 } 3157 3158 /* Do not allow attempts to commit an image into itself */ 3159 if (top_bs == base_bs) { 3160 error_setg(errp, "cannot commit an image into itself"); 3161 goto out; 3162 } 3163 3164 if (top_bs == bs) { 3165 if (has_backing_file) { 3166 error_setg(errp, "'backing-file' specified," 3167 " but 'top' is the active layer"); 3168 goto out; 3169 } 3170 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 3171 bs, &local_err); 3172 } else { 3173 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 3174 has_backing_file ? backing_file : NULL, &local_err); 3175 } 3176 if (local_err != NULL) { 3177 error_propagate(errp, local_err); 3178 goto out; 3179 } 3180 3181 out: 3182 aio_context_release(aio_context); 3183 } 3184 3185 static void do_drive_backup(const char *device, const char *target, 3186 bool has_format, const char *format, 3187 enum MirrorSyncMode sync, 3188 bool has_mode, enum NewImageMode mode, 3189 bool has_speed, int64_t speed, 3190 bool has_bitmap, const char *bitmap, 3191 bool has_on_source_error, 3192 BlockdevOnError on_source_error, 3193 bool has_on_target_error, 3194 BlockdevOnError on_target_error, 3195 BlockJobTxn *txn, Error **errp) 3196 { 3197 BlockBackend *blk; 3198 BlockDriverState *bs; 3199 BlockDriverState *target_bs; 3200 BlockDriverState *source = NULL; 3201 BdrvDirtyBitmap *bmap = NULL; 3202 AioContext *aio_context; 3203 QDict *options = NULL; 3204 Error *local_err = NULL; 3205 int flags; 3206 int64_t size; 3207 3208 if (!has_speed) { 3209 speed = 0; 3210 } 3211 if (!has_on_source_error) { 3212 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3213 } 3214 if (!has_on_target_error) { 3215 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3216 } 3217 if (!has_mode) { 3218 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3219 } 3220 3221 blk = blk_by_name(device); 3222 if (!blk) { 3223 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3224 "Device '%s' not found", device); 3225 return; 3226 } 3227 3228 aio_context = blk_get_aio_context(blk); 3229 aio_context_acquire(aio_context); 3230 3231 /* Although backup_run has this check too, we need to use bs->drv below, so 3232 * do an early check redundantly. */ 3233 if (!blk_is_available(blk)) { 3234 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 3235 goto out; 3236 } 3237 bs = blk_bs(blk); 3238 3239 if (!has_format) { 3240 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 3241 } 3242 3243 /* Early check to avoid creating target */ 3244 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3245 goto out; 3246 } 3247 3248 flags = bs->open_flags | BDRV_O_RDWR; 3249 3250 /* See if we have a backing HD we can use to create our new image 3251 * on top of. */ 3252 if (sync == MIRROR_SYNC_MODE_TOP) { 3253 source = backing_bs(bs); 3254 if (!source) { 3255 sync = MIRROR_SYNC_MODE_FULL; 3256 } 3257 } 3258 if (sync == MIRROR_SYNC_MODE_NONE) { 3259 source = bs; 3260 } 3261 3262 size = bdrv_getlength(bs); 3263 if (size < 0) { 3264 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3265 goto out; 3266 } 3267 3268 if (mode != NEW_IMAGE_MODE_EXISTING) { 3269 assert(format); 3270 if (source) { 3271 bdrv_img_create(target, format, source->filename, 3272 source->drv->format_name, NULL, 3273 size, flags, &local_err, false); 3274 } else { 3275 bdrv_img_create(target, format, NULL, NULL, NULL, 3276 size, flags, &local_err, false); 3277 } 3278 } 3279 3280 if (local_err) { 3281 error_propagate(errp, local_err); 3282 goto out; 3283 } 3284 3285 if (format) { 3286 options = qdict_new(); 3287 qdict_put(options, "driver", qstring_from_str(format)); 3288 } 3289 3290 target_bs = bdrv_open(target, NULL, options, flags, errp); 3291 if (!target_bs) { 3292 goto out; 3293 } 3294 3295 bdrv_set_aio_context(target_bs, aio_context); 3296 3297 if (has_bitmap) { 3298 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 3299 if (!bmap) { 3300 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 3301 bdrv_unref(target_bs); 3302 goto out; 3303 } 3304 } 3305 3306 backup_start(bs, target_bs, speed, sync, bmap, 3307 on_source_error, on_target_error, 3308 block_job_cb, bs, txn, &local_err); 3309 bdrv_unref(target_bs); 3310 if (local_err != NULL) { 3311 error_propagate(errp, local_err); 3312 goto out; 3313 } 3314 3315 out: 3316 aio_context_release(aio_context); 3317 } 3318 3319 void qmp_drive_backup(const char *device, const char *target, 3320 bool has_format, const char *format, 3321 enum MirrorSyncMode sync, 3322 bool has_mode, enum NewImageMode mode, 3323 bool has_speed, int64_t speed, 3324 bool has_bitmap, const char *bitmap, 3325 bool has_on_source_error, BlockdevOnError on_source_error, 3326 bool has_on_target_error, BlockdevOnError on_target_error, 3327 Error **errp) 3328 { 3329 return do_drive_backup(device, target, has_format, format, sync, 3330 has_mode, mode, has_speed, speed, 3331 has_bitmap, bitmap, 3332 has_on_source_error, on_source_error, 3333 has_on_target_error, on_target_error, 3334 NULL, errp); 3335 } 3336 3337 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3338 { 3339 return bdrv_named_nodes_list(errp); 3340 } 3341 3342 void do_blockdev_backup(const char *device, const char *target, 3343 enum MirrorSyncMode sync, 3344 bool has_speed, int64_t speed, 3345 bool has_on_source_error, 3346 BlockdevOnError on_source_error, 3347 bool has_on_target_error, 3348 BlockdevOnError on_target_error, 3349 BlockJobTxn *txn, Error **errp) 3350 { 3351 BlockBackend *blk; 3352 BlockDriverState *bs; 3353 BlockDriverState *target_bs; 3354 Error *local_err = NULL; 3355 AioContext *aio_context; 3356 3357 if (!has_speed) { 3358 speed = 0; 3359 } 3360 if (!has_on_source_error) { 3361 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3362 } 3363 if (!has_on_target_error) { 3364 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3365 } 3366 3367 blk = blk_by_name(device); 3368 if (!blk) { 3369 error_setg(errp, "Device '%s' not found", device); 3370 return; 3371 } 3372 3373 aio_context = blk_get_aio_context(blk); 3374 aio_context_acquire(aio_context); 3375 3376 if (!blk_is_available(blk)) { 3377 error_setg(errp, "Device '%s' has no medium", device); 3378 goto out; 3379 } 3380 bs = blk_bs(blk); 3381 3382 target_bs = bdrv_lookup_bs(target, target, errp); 3383 if (!target_bs) { 3384 goto out; 3385 } 3386 3387 if (bdrv_get_aio_context(target_bs) != aio_context) { 3388 if (!bdrv_has_blk(target_bs)) { 3389 /* The target BDS is not attached, we can safely move it to another 3390 * AioContext. */ 3391 bdrv_set_aio_context(target_bs, aio_context); 3392 } else { 3393 error_setg(errp, "Target is attached to a different thread from " 3394 "source."); 3395 goto out; 3396 } 3397 } 3398 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 3399 on_target_error, block_job_cb, bs, txn, &local_err); 3400 if (local_err != NULL) { 3401 error_propagate(errp, local_err); 3402 } 3403 out: 3404 aio_context_release(aio_context); 3405 } 3406 3407 void qmp_blockdev_backup(const char *device, const char *target, 3408 enum MirrorSyncMode sync, 3409 bool has_speed, int64_t speed, 3410 bool has_on_source_error, 3411 BlockdevOnError on_source_error, 3412 bool has_on_target_error, 3413 BlockdevOnError on_target_error, 3414 Error **errp) 3415 { 3416 do_blockdev_backup(device, target, sync, has_speed, speed, 3417 has_on_source_error, on_source_error, 3418 has_on_target_error, on_target_error, 3419 NULL, errp); 3420 } 3421 3422 /* Parameter check and block job starting for drive mirroring. 3423 * Caller should hold @device and @target's aio context (must be the same). 3424 **/ 3425 static void blockdev_mirror_common(BlockDriverState *bs, 3426 BlockDriverState *target, 3427 bool has_replaces, const char *replaces, 3428 enum MirrorSyncMode sync, 3429 BlockMirrorBackingMode backing_mode, 3430 bool has_speed, int64_t speed, 3431 bool has_granularity, uint32_t granularity, 3432 bool has_buf_size, int64_t buf_size, 3433 bool has_on_source_error, 3434 BlockdevOnError on_source_error, 3435 bool has_on_target_error, 3436 BlockdevOnError on_target_error, 3437 bool has_unmap, bool unmap, 3438 Error **errp) 3439 { 3440 3441 if (!has_speed) { 3442 speed = 0; 3443 } 3444 if (!has_on_source_error) { 3445 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3446 } 3447 if (!has_on_target_error) { 3448 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3449 } 3450 if (!has_granularity) { 3451 granularity = 0; 3452 } 3453 if (!has_buf_size) { 3454 buf_size = 0; 3455 } 3456 if (!has_unmap) { 3457 unmap = true; 3458 } 3459 3460 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3461 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3462 "a value in range [512B, 64MB]"); 3463 return; 3464 } 3465 if (granularity & (granularity - 1)) { 3466 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3467 "power of 2"); 3468 return; 3469 } 3470 3471 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3472 return; 3473 } 3474 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3475 return; 3476 } 3477 3478 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3479 sync = MIRROR_SYNC_MODE_FULL; 3480 } 3481 3482 /* pass the node name to replace to mirror start since it's loose coupling 3483 * and will allow to check whether the node still exist at mirror completion 3484 */ 3485 mirror_start(bs, target, 3486 has_replaces ? replaces : NULL, 3487 speed, granularity, buf_size, sync, backing_mode, 3488 on_source_error, on_target_error, unmap, 3489 block_job_cb, bs, errp); 3490 } 3491 3492 void qmp_drive_mirror(const char *device, const char *target, 3493 bool has_format, const char *format, 3494 bool has_node_name, const char *node_name, 3495 bool has_replaces, const char *replaces, 3496 enum MirrorSyncMode sync, 3497 bool has_mode, enum NewImageMode mode, 3498 bool has_speed, int64_t speed, 3499 bool has_granularity, uint32_t granularity, 3500 bool has_buf_size, int64_t buf_size, 3501 bool has_on_source_error, BlockdevOnError on_source_error, 3502 bool has_on_target_error, BlockdevOnError on_target_error, 3503 bool has_unmap, bool unmap, 3504 Error **errp) 3505 { 3506 BlockDriverState *bs; 3507 BlockBackend *blk; 3508 BlockDriverState *source, *target_bs; 3509 AioContext *aio_context; 3510 BlockMirrorBackingMode backing_mode; 3511 Error *local_err = NULL; 3512 QDict *options = NULL; 3513 int flags; 3514 int64_t size; 3515 3516 blk = blk_by_name(device); 3517 if (!blk) { 3518 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3519 "Device '%s' not found", device); 3520 return; 3521 } 3522 3523 aio_context = blk_get_aio_context(blk); 3524 aio_context_acquire(aio_context); 3525 3526 if (!blk_is_available(blk)) { 3527 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 3528 goto out; 3529 } 3530 bs = blk_bs(blk); 3531 if (!has_mode) { 3532 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3533 } 3534 3535 if (!has_format) { 3536 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 3537 } 3538 3539 flags = bs->open_flags | BDRV_O_RDWR; 3540 source = backing_bs(bs); 3541 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 3542 sync = MIRROR_SYNC_MODE_FULL; 3543 } 3544 if (sync == MIRROR_SYNC_MODE_NONE) { 3545 source = bs; 3546 } 3547 3548 size = bdrv_getlength(bs); 3549 if (size < 0) { 3550 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3551 goto out; 3552 } 3553 3554 if (has_replaces) { 3555 BlockDriverState *to_replace_bs; 3556 AioContext *replace_aio_context; 3557 int64_t replace_size; 3558 3559 if (!has_node_name) { 3560 error_setg(errp, "a node-name must be provided when replacing a" 3561 " named node of the graph"); 3562 goto out; 3563 } 3564 3565 to_replace_bs = check_to_replace_node(bs, replaces, &local_err); 3566 3567 if (!to_replace_bs) { 3568 error_propagate(errp, local_err); 3569 goto out; 3570 } 3571 3572 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3573 aio_context_acquire(replace_aio_context); 3574 replace_size = bdrv_getlength(to_replace_bs); 3575 aio_context_release(replace_aio_context); 3576 3577 if (size != replace_size) { 3578 error_setg(errp, "cannot replace image with a mirror image of " 3579 "different size"); 3580 goto out; 3581 } 3582 } 3583 3584 if (mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3585 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3586 } else { 3587 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3588 } 3589 3590 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 3591 && mode != NEW_IMAGE_MODE_EXISTING) 3592 { 3593 /* create new image w/o backing file */ 3594 assert(format); 3595 bdrv_img_create(target, format, 3596 NULL, NULL, NULL, size, flags, &local_err, false); 3597 } else { 3598 switch (mode) { 3599 case NEW_IMAGE_MODE_EXISTING: 3600 break; 3601 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3602 /* create new image with backing file */ 3603 bdrv_img_create(target, format, 3604 source->filename, 3605 source->drv->format_name, 3606 NULL, size, flags, &local_err, false); 3607 break; 3608 default: 3609 abort(); 3610 } 3611 } 3612 3613 if (local_err) { 3614 error_propagate(errp, local_err); 3615 goto out; 3616 } 3617 3618 options = qdict_new(); 3619 if (has_node_name) { 3620 qdict_put(options, "node-name", qstring_from_str(node_name)); 3621 } 3622 if (format) { 3623 qdict_put(options, "driver", qstring_from_str(format)); 3624 } 3625 3626 /* Mirroring takes care of copy-on-write using the source's backing 3627 * file. 3628 */ 3629 target_bs = bdrv_open(target, NULL, options, flags | BDRV_O_NO_BACKING, 3630 errp); 3631 if (!target_bs) { 3632 goto out; 3633 } 3634 3635 bdrv_set_aio_context(target_bs, aio_context); 3636 3637 blockdev_mirror_common(bs, target_bs, 3638 has_replaces, replaces, sync, backing_mode, 3639 has_speed, speed, 3640 has_granularity, granularity, 3641 has_buf_size, buf_size, 3642 has_on_source_error, on_source_error, 3643 has_on_target_error, on_target_error, 3644 has_unmap, unmap, 3645 &local_err); 3646 bdrv_unref(target_bs); 3647 error_propagate(errp, local_err); 3648 out: 3649 aio_context_release(aio_context); 3650 } 3651 3652 void qmp_blockdev_mirror(const char *device, const char *target, 3653 bool has_replaces, const char *replaces, 3654 MirrorSyncMode sync, 3655 bool has_speed, int64_t speed, 3656 bool has_granularity, uint32_t granularity, 3657 bool has_buf_size, int64_t buf_size, 3658 bool has_on_source_error, 3659 BlockdevOnError on_source_error, 3660 bool has_on_target_error, 3661 BlockdevOnError on_target_error, 3662 Error **errp) 3663 { 3664 BlockDriverState *bs; 3665 BlockBackend *blk; 3666 BlockDriverState *target_bs; 3667 AioContext *aio_context; 3668 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3669 Error *local_err = NULL; 3670 3671 blk = blk_by_name(device); 3672 if (!blk) { 3673 error_setg(errp, "Device '%s' not found", device); 3674 return; 3675 } 3676 bs = blk_bs(blk); 3677 3678 if (!bs) { 3679 error_setg(errp, "Device '%s' has no media", device); 3680 return; 3681 } 3682 3683 target_bs = bdrv_lookup_bs(target, target, errp); 3684 if (!target_bs) { 3685 return; 3686 } 3687 3688 aio_context = bdrv_get_aio_context(bs); 3689 aio_context_acquire(aio_context); 3690 3691 bdrv_set_aio_context(target_bs, aio_context); 3692 3693 blockdev_mirror_common(bs, target_bs, 3694 has_replaces, replaces, sync, backing_mode, 3695 has_speed, speed, 3696 has_granularity, granularity, 3697 has_buf_size, buf_size, 3698 has_on_source_error, on_source_error, 3699 has_on_target_error, on_target_error, 3700 true, true, 3701 &local_err); 3702 error_propagate(errp, local_err); 3703 3704 aio_context_release(aio_context); 3705 } 3706 3707 /* Get the block job for a given device name and acquire its AioContext */ 3708 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 3709 Error **errp) 3710 { 3711 BlockBackend *blk; 3712 BlockDriverState *bs; 3713 3714 *aio_context = NULL; 3715 3716 blk = blk_by_name(device); 3717 if (!blk) { 3718 goto notfound; 3719 } 3720 3721 *aio_context = blk_get_aio_context(blk); 3722 aio_context_acquire(*aio_context); 3723 3724 if (!blk_is_available(blk)) { 3725 goto notfound; 3726 } 3727 bs = blk_bs(blk); 3728 3729 if (!bs->job) { 3730 goto notfound; 3731 } 3732 3733 return bs->job; 3734 3735 notfound: 3736 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3737 "No active block job on device '%s'", device); 3738 if (*aio_context) { 3739 aio_context_release(*aio_context); 3740 *aio_context = NULL; 3741 } 3742 return NULL; 3743 } 3744 3745 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3746 { 3747 AioContext *aio_context; 3748 BlockJob *job = find_block_job(device, &aio_context, errp); 3749 3750 if (!job) { 3751 return; 3752 } 3753 3754 block_job_set_speed(job, speed, errp); 3755 aio_context_release(aio_context); 3756 } 3757 3758 void qmp_block_job_cancel(const char *device, 3759 bool has_force, bool force, Error **errp) 3760 { 3761 AioContext *aio_context; 3762 BlockJob *job = find_block_job(device, &aio_context, errp); 3763 3764 if (!job) { 3765 return; 3766 } 3767 3768 if (!has_force) { 3769 force = false; 3770 } 3771 3772 if (job->user_paused && !force) { 3773 error_setg(errp, "The block job for device '%s' is currently paused", 3774 device); 3775 goto out; 3776 } 3777 3778 trace_qmp_block_job_cancel(job); 3779 block_job_cancel(job); 3780 out: 3781 aio_context_release(aio_context); 3782 } 3783 3784 void qmp_block_job_pause(const char *device, Error **errp) 3785 { 3786 AioContext *aio_context; 3787 BlockJob *job = find_block_job(device, &aio_context, errp); 3788 3789 if (!job || job->user_paused) { 3790 return; 3791 } 3792 3793 job->user_paused = true; 3794 trace_qmp_block_job_pause(job); 3795 block_job_pause(job); 3796 aio_context_release(aio_context); 3797 } 3798 3799 void qmp_block_job_resume(const char *device, Error **errp) 3800 { 3801 AioContext *aio_context; 3802 BlockJob *job = find_block_job(device, &aio_context, errp); 3803 3804 if (!job || !job->user_paused) { 3805 return; 3806 } 3807 3808 job->user_paused = false; 3809 trace_qmp_block_job_resume(job); 3810 block_job_resume(job); 3811 aio_context_release(aio_context); 3812 } 3813 3814 void qmp_block_job_complete(const char *device, Error **errp) 3815 { 3816 AioContext *aio_context; 3817 BlockJob *job = find_block_job(device, &aio_context, errp); 3818 3819 if (!job) { 3820 return; 3821 } 3822 3823 trace_qmp_block_job_complete(job); 3824 block_job_complete(job, errp); 3825 aio_context_release(aio_context); 3826 } 3827 3828 void qmp_change_backing_file(const char *device, 3829 const char *image_node_name, 3830 const char *backing_file, 3831 Error **errp) 3832 { 3833 BlockBackend *blk; 3834 BlockDriverState *bs = NULL; 3835 AioContext *aio_context; 3836 BlockDriverState *image_bs = NULL; 3837 Error *local_err = NULL; 3838 bool ro; 3839 int open_flags; 3840 int ret; 3841 3842 blk = blk_by_name(device); 3843 if (!blk) { 3844 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3845 "Device '%s' not found", device); 3846 return; 3847 } 3848 3849 aio_context = blk_get_aio_context(blk); 3850 aio_context_acquire(aio_context); 3851 3852 if (!blk_is_available(blk)) { 3853 error_setg(errp, "Device '%s' has no medium", device); 3854 goto out; 3855 } 3856 bs = blk_bs(blk); 3857 3858 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3859 if (local_err) { 3860 error_propagate(errp, local_err); 3861 goto out; 3862 } 3863 3864 if (!image_bs) { 3865 error_setg(errp, "image file not found"); 3866 goto out; 3867 } 3868 3869 if (bdrv_find_base(image_bs) == image_bs) { 3870 error_setg(errp, "not allowing backing file change on an image " 3871 "without a backing file"); 3872 goto out; 3873 } 3874 3875 /* even though we are not necessarily operating on bs, we need it to 3876 * determine if block ops are currently prohibited on the chain */ 3877 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3878 goto out; 3879 } 3880 3881 /* final sanity check */ 3882 if (!bdrv_chain_contains(bs, image_bs)) { 3883 error_setg(errp, "'%s' and image file are not in the same chain", 3884 device); 3885 goto out; 3886 } 3887 3888 /* if not r/w, reopen to make r/w */ 3889 open_flags = image_bs->open_flags; 3890 ro = bdrv_is_read_only(image_bs); 3891 3892 if (ro) { 3893 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3894 if (local_err) { 3895 error_propagate(errp, local_err); 3896 goto out; 3897 } 3898 } 3899 3900 ret = bdrv_change_backing_file(image_bs, backing_file, 3901 image_bs->drv ? image_bs->drv->format_name : ""); 3902 3903 if (ret < 0) { 3904 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3905 backing_file); 3906 /* don't exit here, so we can try to restore open flags if 3907 * appropriate */ 3908 } 3909 3910 if (ro) { 3911 bdrv_reopen(image_bs, open_flags, &local_err); 3912 error_propagate(errp, local_err); 3913 } 3914 3915 out: 3916 aio_context_release(aio_context); 3917 } 3918 3919 void hmp_drive_add_node(Monitor *mon, const char *optstr) 3920 { 3921 QemuOpts *opts; 3922 QDict *qdict; 3923 Error *local_err = NULL; 3924 3925 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 3926 if (!opts) { 3927 return; 3928 } 3929 3930 qdict = qemu_opts_to_qdict(opts, NULL); 3931 3932 if (!qdict_get_try_str(qdict, "node-name")) { 3933 QDECREF(qdict); 3934 error_report("'node-name' needs to be specified"); 3935 goto out; 3936 } 3937 3938 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 3939 if (!bs) { 3940 error_report_err(local_err); 3941 goto out; 3942 } 3943 3944 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 3945 3946 out: 3947 qemu_opts_del(opts); 3948 } 3949 3950 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3951 { 3952 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3953 BlockDriverState *bs; 3954 BlockBackend *blk = NULL; 3955 QObject *obj; 3956 QDict *qdict; 3957 Error *local_err = NULL; 3958 3959 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3960 * cache.direct=false instead of silently switching to aio=threads, except 3961 * when called from drive_new(). 3962 * 3963 * For now, simply forbidding the combination for all drivers will do. */ 3964 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3965 bool direct = options->has_cache && 3966 options->cache->has_direct && 3967 options->cache->direct; 3968 if (!direct) { 3969 error_setg(errp, "aio=native requires cache.direct=true"); 3970 goto fail; 3971 } 3972 } 3973 3974 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), NULL, &options, 3975 &local_err); 3976 if (local_err) { 3977 error_propagate(errp, local_err); 3978 goto fail; 3979 } 3980 3981 obj = qmp_output_get_qobject(ov); 3982 qdict = qobject_to_qdict(obj); 3983 3984 qdict_flatten(qdict); 3985 3986 if (options->has_id) { 3987 blk = blockdev_init(NULL, qdict, &local_err); 3988 if (local_err) { 3989 error_propagate(errp, local_err); 3990 goto fail; 3991 } 3992 3993 bs = blk_bs(blk); 3994 } else { 3995 if (!qdict_get_try_str(qdict, "node-name")) { 3996 error_setg(errp, "'id' and/or 'node-name' need to be specified for " 3997 "the root node"); 3998 goto fail; 3999 } 4000 4001 bs = bds_tree_init(qdict, errp); 4002 if (!bs) { 4003 goto fail; 4004 } 4005 4006 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4007 } 4008 4009 if (bs && bdrv_key_required(bs)) { 4010 if (blk) { 4011 monitor_remove_blk(blk); 4012 blk_unref(blk); 4013 } else { 4014 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4015 bdrv_unref(bs); 4016 } 4017 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 4018 goto fail; 4019 } 4020 4021 fail: 4022 qmp_output_visitor_cleanup(ov); 4023 } 4024 4025 void qmp_x_blockdev_del(bool has_id, const char *id, 4026 bool has_node_name, const char *node_name, Error **errp) 4027 { 4028 AioContext *aio_context; 4029 BlockBackend *blk; 4030 BlockDriverState *bs; 4031 4032 if (has_id && has_node_name) { 4033 error_setg(errp, "Only one of id and node-name must be specified"); 4034 return; 4035 } else if (!has_id && !has_node_name) { 4036 error_setg(errp, "No block device specified"); 4037 return; 4038 } 4039 4040 if (has_id) { 4041 /* blk_by_name() never returns a BB that is not owned by the monitor */ 4042 blk = blk_by_name(id); 4043 if (!blk) { 4044 error_setg(errp, "Cannot find block backend %s", id); 4045 return; 4046 } 4047 if (blk_legacy_dinfo(blk)) { 4048 error_setg(errp, "Deleting block backend added with drive-add" 4049 " is not supported"); 4050 return; 4051 } 4052 if (blk_get_refcnt(blk) > 1) { 4053 error_setg(errp, "Block backend %s is in use", id); 4054 return; 4055 } 4056 bs = blk_bs(blk); 4057 aio_context = blk_get_aio_context(blk); 4058 } else { 4059 blk = NULL; 4060 bs = bdrv_find_node(node_name); 4061 if (!bs) { 4062 error_setg(errp, "Cannot find node %s", node_name); 4063 return; 4064 } 4065 if (bdrv_has_blk(bs)) { 4066 error_setg(errp, "Node %s is in use by %s", 4067 node_name, bdrv_get_parent_name(bs)); 4068 return; 4069 } 4070 aio_context = bdrv_get_aio_context(bs); 4071 } 4072 4073 aio_context_acquire(aio_context); 4074 4075 if (bs) { 4076 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4077 goto out; 4078 } 4079 4080 if (!blk && !bs->monitor_list.tqe_prev) { 4081 error_setg(errp, "Node %s is not owned by the monitor", 4082 bs->node_name); 4083 goto out; 4084 } 4085 4086 if (bs->refcnt > 1) { 4087 error_setg(errp, "Block device %s is in use", 4088 bdrv_get_device_or_node_name(bs)); 4089 goto out; 4090 } 4091 } 4092 4093 if (blk) { 4094 monitor_remove_blk(blk); 4095 blk_unref(blk); 4096 } else { 4097 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4098 bdrv_unref(bs); 4099 } 4100 4101 out: 4102 aio_context_release(aio_context); 4103 } 4104 4105 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4106 const char *child_name) 4107 { 4108 BdrvChild *child; 4109 4110 QLIST_FOREACH(child, &parent_bs->children, next) { 4111 if (strcmp(child->name, child_name) == 0) { 4112 return child; 4113 } 4114 } 4115 4116 return NULL; 4117 } 4118 4119 void qmp_x_blockdev_change(const char *parent, bool has_child, 4120 const char *child, bool has_node, 4121 const char *node, Error **errp) 4122 { 4123 BlockDriverState *parent_bs, *new_bs = NULL; 4124 BdrvChild *p_child; 4125 4126 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4127 if (!parent_bs) { 4128 return; 4129 } 4130 4131 if (has_child == has_node) { 4132 if (has_child) { 4133 error_setg(errp, "The parameters child and node are in conflict"); 4134 } else { 4135 error_setg(errp, "Either child or node must be specified"); 4136 } 4137 return; 4138 } 4139 4140 if (has_child) { 4141 p_child = bdrv_find_child(parent_bs, child); 4142 if (!p_child) { 4143 error_setg(errp, "Node '%s' does not have child '%s'", 4144 parent, child); 4145 return; 4146 } 4147 bdrv_del_child(parent_bs, p_child, errp); 4148 } 4149 4150 if (has_node) { 4151 new_bs = bdrv_find_node(node); 4152 if (!new_bs) { 4153 error_setg(errp, "Node '%s' not found", node); 4154 return; 4155 } 4156 bdrv_add_child(parent_bs, new_bs, errp); 4157 } 4158 } 4159 4160 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4161 { 4162 BlockJobInfoList *head = NULL, **p_next = &head; 4163 BlockJob *job; 4164 4165 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4166 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 4167 AioContext *aio_context = blk_get_aio_context(job->blk); 4168 4169 aio_context_acquire(aio_context); 4170 elem->value = block_job_query(job); 4171 aio_context_release(aio_context); 4172 4173 *p_next = elem; 4174 p_next = &elem->next; 4175 } 4176 4177 return head; 4178 } 4179 4180 QemuOptsList qemu_common_drive_opts = { 4181 .name = "drive", 4182 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4183 .desc = { 4184 { 4185 .name = "snapshot", 4186 .type = QEMU_OPT_BOOL, 4187 .help = "enable/disable snapshot mode", 4188 },{ 4189 .name = "discard", 4190 .type = QEMU_OPT_STRING, 4191 .help = "discard operation (ignore/off, unmap/on)", 4192 },{ 4193 .name = "aio", 4194 .type = QEMU_OPT_STRING, 4195 .help = "host AIO implementation (threads, native)", 4196 },{ 4197 .name = BDRV_OPT_CACHE_WB, 4198 .type = QEMU_OPT_BOOL, 4199 .help = "Enable writeback mode", 4200 },{ 4201 .name = "format", 4202 .type = QEMU_OPT_STRING, 4203 .help = "disk format (raw, qcow2, ...)", 4204 },{ 4205 .name = "rerror", 4206 .type = QEMU_OPT_STRING, 4207 .help = "read error action", 4208 },{ 4209 .name = "werror", 4210 .type = QEMU_OPT_STRING, 4211 .help = "write error action", 4212 },{ 4213 .name = "read-only", 4214 .type = QEMU_OPT_BOOL, 4215 .help = "open drive file as read-only", 4216 },{ 4217 .name = "throttling.iops-total", 4218 .type = QEMU_OPT_NUMBER, 4219 .help = "limit total I/O operations per second", 4220 },{ 4221 .name = "throttling.iops-read", 4222 .type = QEMU_OPT_NUMBER, 4223 .help = "limit read operations per second", 4224 },{ 4225 .name = "throttling.iops-write", 4226 .type = QEMU_OPT_NUMBER, 4227 .help = "limit write operations per second", 4228 },{ 4229 .name = "throttling.bps-total", 4230 .type = QEMU_OPT_NUMBER, 4231 .help = "limit total bytes per second", 4232 },{ 4233 .name = "throttling.bps-read", 4234 .type = QEMU_OPT_NUMBER, 4235 .help = "limit read bytes per second", 4236 },{ 4237 .name = "throttling.bps-write", 4238 .type = QEMU_OPT_NUMBER, 4239 .help = "limit write bytes per second", 4240 },{ 4241 .name = "throttling.iops-total-max", 4242 .type = QEMU_OPT_NUMBER, 4243 .help = "I/O operations burst", 4244 },{ 4245 .name = "throttling.iops-read-max", 4246 .type = QEMU_OPT_NUMBER, 4247 .help = "I/O operations read burst", 4248 },{ 4249 .name = "throttling.iops-write-max", 4250 .type = QEMU_OPT_NUMBER, 4251 .help = "I/O operations write burst", 4252 },{ 4253 .name = "throttling.bps-total-max", 4254 .type = QEMU_OPT_NUMBER, 4255 .help = "total bytes burst", 4256 },{ 4257 .name = "throttling.bps-read-max", 4258 .type = QEMU_OPT_NUMBER, 4259 .help = "total bytes read burst", 4260 },{ 4261 .name = "throttling.bps-write-max", 4262 .type = QEMU_OPT_NUMBER, 4263 .help = "total bytes write burst", 4264 },{ 4265 .name = "throttling.iops-total-max-length", 4266 .type = QEMU_OPT_NUMBER, 4267 .help = "length of the iops-total-max burst period, in seconds", 4268 },{ 4269 .name = "throttling.iops-read-max-length", 4270 .type = QEMU_OPT_NUMBER, 4271 .help = "length of the iops-read-max burst period, in seconds", 4272 },{ 4273 .name = "throttling.iops-write-max-length", 4274 .type = QEMU_OPT_NUMBER, 4275 .help = "length of the iops-write-max burst period, in seconds", 4276 },{ 4277 .name = "throttling.bps-total-max-length", 4278 .type = QEMU_OPT_NUMBER, 4279 .help = "length of the bps-total-max burst period, in seconds", 4280 },{ 4281 .name = "throttling.bps-read-max-length", 4282 .type = QEMU_OPT_NUMBER, 4283 .help = "length of the bps-read-max burst period, in seconds", 4284 },{ 4285 .name = "throttling.bps-write-max-length", 4286 .type = QEMU_OPT_NUMBER, 4287 .help = "length of the bps-write-max burst period, in seconds", 4288 },{ 4289 .name = "throttling.iops-size", 4290 .type = QEMU_OPT_NUMBER, 4291 .help = "when limiting by iops max size of an I/O in bytes", 4292 },{ 4293 .name = "throttling.group", 4294 .type = QEMU_OPT_STRING, 4295 .help = "name of the block throttling group", 4296 },{ 4297 .name = "copy-on-read", 4298 .type = QEMU_OPT_BOOL, 4299 .help = "copy read data from backing file into image file", 4300 },{ 4301 .name = "detect-zeroes", 4302 .type = QEMU_OPT_STRING, 4303 .help = "try to optimize zero writes (off, on, unmap)", 4304 },{ 4305 .name = "stats-account-invalid", 4306 .type = QEMU_OPT_BOOL, 4307 .help = "whether to account for invalid I/O operations " 4308 "in the statistics", 4309 },{ 4310 .name = "stats-account-failed", 4311 .type = QEMU_OPT_BOOL, 4312 .help = "whether to account for failed I/O operations " 4313 "in the statistics", 4314 }, 4315 { /* end of list */ } 4316 }, 4317 }; 4318 4319 static QemuOptsList qemu_root_bds_opts = { 4320 .name = "root-bds", 4321 .head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head), 4322 .desc = { 4323 { 4324 .name = "discard", 4325 .type = QEMU_OPT_STRING, 4326 .help = "discard operation (ignore/off, unmap/on)", 4327 },{ 4328 .name = "aio", 4329 .type = QEMU_OPT_STRING, 4330 .help = "host AIO implementation (threads, native)", 4331 },{ 4332 .name = "read-only", 4333 .type = QEMU_OPT_BOOL, 4334 .help = "open drive file as read-only", 4335 },{ 4336 .name = "copy-on-read", 4337 .type = QEMU_OPT_BOOL, 4338 .help = "copy read data from backing file into image file", 4339 },{ 4340 .name = "detect-zeroes", 4341 .type = QEMU_OPT_STRING, 4342 .help = "try to optimize zero writes (off, on, unmap)", 4343 }, 4344 { /* end of list */ } 4345 }, 4346 }; 4347 4348 QemuOptsList qemu_drive_opts = { 4349 .name = "drive", 4350 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4351 .desc = { 4352 /* 4353 * no elements => accept any params 4354 * validation will happen later 4355 */ 4356 { /* end of list */ } 4357 }, 4358 }; 4359