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