1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "qemu/osdep.h" 34 #include "sysemu/block-backend.h" 35 #include "sysemu/blockdev.h" 36 #include "hw/block/block.h" 37 #include "block/blockjob.h" 38 #include "block/qdict.h" 39 #include "block/throttle-groups.h" 40 #include "monitor/monitor.h" 41 #include "qemu/error-report.h" 42 #include "qemu/option.h" 43 #include "qemu/qemu-print.h" 44 #include "qemu/config-file.h" 45 #include "qapi/qapi-commands-block.h" 46 #include "qapi/qapi-commands-transaction.h" 47 #include "qapi/qapi-visit-block-core.h" 48 #include "qapi/qmp/qdict.h" 49 #include "qapi/qmp/qnum.h" 50 #include "qapi/qmp/qstring.h" 51 #include "qapi/error.h" 52 #include "qapi/qmp/qerror.h" 53 #include "qapi/qmp/qlist.h" 54 #include "qapi/qobject-output-visitor.h" 55 #include "sysemu/sysemu.h" 56 #include "sysemu/iothread.h" 57 #include "block/block_int.h" 58 #include "block/trace.h" 59 #include "sysemu/arch_init.h" 60 #include "sysemu/qtest.h" 61 #include "sysemu/runstate.h" 62 #include "qemu/cutils.h" 63 #include "qemu/help_option.h" 64 #include "qemu/main-loop.h" 65 #include "qemu/throttle-options.h" 66 67 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 68 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 69 70 static int do_open_tray(const char *blk_name, const char *qdev_id, 71 bool force, Error **errp); 72 static void blockdev_remove_medium(bool has_device, const char *device, 73 bool has_id, const char *id, Error **errp); 74 static void blockdev_insert_medium(bool has_device, const char *device, 75 bool has_id, const char *id, 76 const char *node_name, Error **errp); 77 78 static const char *const if_name[IF_COUNT] = { 79 [IF_NONE] = "none", 80 [IF_IDE] = "ide", 81 [IF_SCSI] = "scsi", 82 [IF_FLOPPY] = "floppy", 83 [IF_PFLASH] = "pflash", 84 [IF_MTD] = "mtd", 85 [IF_SD] = "sd", 86 [IF_VIRTIO] = "virtio", 87 [IF_XEN] = "xen", 88 }; 89 90 static int if_max_devs[IF_COUNT] = { 91 /* 92 * Do not change these numbers! They govern how drive option 93 * index maps to unit and bus. That mapping is ABI. 94 * 95 * All controllers used to implement if=T drives need to support 96 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 97 * Otherwise, some index values map to "impossible" bus, unit 98 * values. 99 * 100 * For instance, if you change [IF_SCSI] to 255, -drive 101 * if=scsi,index=12 no longer means bus=1,unit=5, but 102 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 103 * the drive can't be set up. Regression. 104 */ 105 [IF_IDE] = 2, 106 [IF_SCSI] = 7, 107 }; 108 109 /** 110 * Boards may call this to offer board-by-board overrides 111 * of the default, global values. 112 */ 113 void override_max_devs(BlockInterfaceType type, int max_devs) 114 { 115 BlockBackend *blk; 116 DriveInfo *dinfo; 117 118 if (max_devs <= 0) { 119 return; 120 } 121 122 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 123 dinfo = blk_legacy_dinfo(blk); 124 if (dinfo->type == type) { 125 fprintf(stderr, "Cannot override units-per-bus property of" 126 " the %s interface, because a drive of that type has" 127 " already been added.\n", if_name[type]); 128 g_assert_not_reached(); 129 } 130 } 131 132 if_max_devs[type] = max_devs; 133 } 134 135 /* 136 * We automatically delete the drive when a device using it gets 137 * unplugged. Questionable feature, but we can't just drop it. 138 * Device models call blockdev_mark_auto_del() to schedule the 139 * automatic deletion, and generic qdev code calls blockdev_auto_del() 140 * when deletion is actually safe. 141 */ 142 void blockdev_mark_auto_del(BlockBackend *blk) 143 { 144 DriveInfo *dinfo = blk_legacy_dinfo(blk); 145 BlockJob *job; 146 147 if (!dinfo) { 148 return; 149 } 150 151 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 152 if (block_job_has_bdrv(job, blk_bs(blk))) { 153 AioContext *aio_context = job->job.aio_context; 154 aio_context_acquire(aio_context); 155 156 job_cancel(&job->job, false); 157 158 aio_context_release(aio_context); 159 } 160 } 161 162 dinfo->auto_del = 1; 163 } 164 165 void blockdev_auto_del(BlockBackend *blk) 166 { 167 DriveInfo *dinfo = blk_legacy_dinfo(blk); 168 169 if (dinfo && dinfo->auto_del) { 170 monitor_remove_blk(blk); 171 blk_unref(blk); 172 } 173 } 174 175 /** 176 * Returns the current mapping of how many units per bus 177 * a particular interface can support. 178 * 179 * A positive integer indicates n units per bus. 180 * 0 implies the mapping has not been established. 181 * -1 indicates an invalid BlockInterfaceType was given. 182 */ 183 int drive_get_max_devs(BlockInterfaceType type) 184 { 185 if (type >= IF_IDE && type < IF_COUNT) { 186 return if_max_devs[type]; 187 } 188 189 return -1; 190 } 191 192 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 193 { 194 int max_devs = if_max_devs[type]; 195 return max_devs ? index / max_devs : 0; 196 } 197 198 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 199 { 200 int max_devs = if_max_devs[type]; 201 return max_devs ? index % max_devs : index; 202 } 203 204 QemuOpts *drive_def(const char *optstr) 205 { 206 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 207 } 208 209 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 210 const char *optstr) 211 { 212 QemuOpts *opts; 213 214 opts = drive_def(optstr); 215 if (!opts) { 216 return NULL; 217 } 218 if (type != IF_DEFAULT) { 219 qemu_opt_set(opts, "if", if_name[type], &error_abort); 220 } 221 if (index >= 0) { 222 qemu_opt_set_number(opts, "index", index, &error_abort); 223 } 224 if (file) 225 qemu_opt_set(opts, "file", file, &error_abort); 226 return opts; 227 } 228 229 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 230 { 231 BlockBackend *blk; 232 DriveInfo *dinfo; 233 234 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 235 dinfo = blk_legacy_dinfo(blk); 236 if (dinfo && dinfo->type == type 237 && dinfo->bus == bus && dinfo->unit == unit) { 238 return dinfo; 239 } 240 } 241 242 return NULL; 243 } 244 245 void drive_check_orphaned(void) 246 { 247 BlockBackend *blk; 248 DriveInfo *dinfo; 249 Location loc; 250 bool orphans = false; 251 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 255 dinfo->type != IF_NONE) { 256 loc_push_none(&loc); 257 qemu_opts_loc_restore(dinfo->opts); 258 error_report("machine type does not support" 259 " if=%s,bus=%d,unit=%d", 260 if_name[dinfo->type], dinfo->bus, dinfo->unit); 261 loc_pop(&loc); 262 orphans = true; 263 } 264 } 265 266 if (orphans) { 267 exit(1); 268 } 269 } 270 271 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 272 { 273 return drive_get(type, 274 drive_index_to_bus_id(type, index), 275 drive_index_to_unit_id(type, index)); 276 } 277 278 int drive_get_max_bus(BlockInterfaceType type) 279 { 280 int max_bus; 281 BlockBackend *blk; 282 DriveInfo *dinfo; 283 284 max_bus = -1; 285 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 286 dinfo = blk_legacy_dinfo(blk); 287 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 288 max_bus = dinfo->bus; 289 } 290 } 291 return max_bus; 292 } 293 294 /* Get a block device. This should only be used for single-drive devices 295 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 296 appropriate bus. */ 297 DriveInfo *drive_get_next(BlockInterfaceType type) 298 { 299 static int next_block_unit[IF_COUNT]; 300 301 return drive_get(type, 0, next_block_unit[type]++); 302 } 303 304 static void bdrv_format_print(void *opaque, const char *name) 305 { 306 qemu_printf(" %s", name); 307 } 308 309 typedef struct { 310 QEMUBH *bh; 311 BlockDriverState *bs; 312 } BDRVPutRefBH; 313 314 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 315 { 316 if (!strcmp(buf, "ignore")) { 317 return BLOCKDEV_ON_ERROR_IGNORE; 318 } else if (!is_read && !strcmp(buf, "enospc")) { 319 return BLOCKDEV_ON_ERROR_ENOSPC; 320 } else if (!strcmp(buf, "stop")) { 321 return BLOCKDEV_ON_ERROR_STOP; 322 } else if (!strcmp(buf, "report")) { 323 return BLOCKDEV_ON_ERROR_REPORT; 324 } else { 325 error_setg(errp, "'%s' invalid %s error action", 326 buf, is_read ? "read" : "write"); 327 return -1; 328 } 329 } 330 331 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 332 Error **errp) 333 { 334 const QListEntry *entry; 335 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 336 switch (qobject_type(entry->value)) { 337 338 case QTYPE_QSTRING: { 339 unsigned long long length; 340 const char *str = qstring_get_str(qobject_to(QString, 341 entry->value)); 342 if (parse_uint_full(str, &length, 10) == 0 && 343 length > 0 && length <= UINT_MAX) { 344 block_acct_add_interval(stats, (unsigned) length); 345 } else { 346 error_setg(errp, "Invalid interval length: %s", str); 347 return false; 348 } 349 break; 350 } 351 352 case QTYPE_QNUM: { 353 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 354 355 if (length > 0 && length <= UINT_MAX) { 356 block_acct_add_interval(stats, (unsigned) length); 357 } else { 358 error_setg(errp, "Invalid interval length: %" PRId64, length); 359 return false; 360 } 361 break; 362 } 363 364 default: 365 error_setg(errp, "The specification of stats-intervals is invalid"); 366 return false; 367 } 368 } 369 return true; 370 } 371 372 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 373 374 /* All parameters but @opts are optional and may be set to NULL. */ 375 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 376 const char **throttling_group, ThrottleConfig *throttle_cfg, 377 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 378 { 379 Error *local_error = NULL; 380 const char *aio; 381 382 if (bdrv_flags) { 383 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 384 *bdrv_flags |= BDRV_O_COPY_ON_READ; 385 } 386 387 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 388 if (!strcmp(aio, "native")) { 389 *bdrv_flags |= BDRV_O_NATIVE_AIO; 390 } else if (!strcmp(aio, "threads")) { 391 /* this is the default */ 392 } else { 393 error_setg(errp, "invalid aio option"); 394 return; 395 } 396 } 397 } 398 399 /* disk I/O throttling */ 400 if (throttling_group) { 401 *throttling_group = qemu_opt_get(opts, "throttling.group"); 402 } 403 404 if (throttle_cfg) { 405 throttle_config_init(throttle_cfg); 406 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 407 qemu_opt_get_number(opts, "throttling.bps-total", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 409 qemu_opt_get_number(opts, "throttling.bps-read", 0); 410 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 411 qemu_opt_get_number(opts, "throttling.bps-write", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 413 qemu_opt_get_number(opts, "throttling.iops-total", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 415 qemu_opt_get_number(opts, "throttling.iops-read", 0); 416 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 417 qemu_opt_get_number(opts, "throttling.iops-write", 0); 418 419 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 420 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 421 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 422 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 423 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 424 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 425 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 426 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 427 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 428 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 429 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 430 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 431 432 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 433 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 434 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 435 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 436 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 437 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 438 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 439 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 440 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 441 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 442 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 443 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 444 445 throttle_cfg->op_size = 446 qemu_opt_get_number(opts, "throttling.iops-size", 0); 447 448 if (!throttle_is_valid(throttle_cfg, errp)) { 449 return; 450 } 451 } 452 453 if (detect_zeroes) { 454 *detect_zeroes = 455 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 456 qemu_opt_get(opts, "detect-zeroes"), 457 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 458 &local_error); 459 if (local_error) { 460 error_propagate(errp, local_error); 461 return; 462 } 463 } 464 } 465 466 /* Takes the ownership of bs_opts */ 467 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 468 Error **errp) 469 { 470 const char *buf; 471 int bdrv_flags = 0; 472 int on_read_error, on_write_error; 473 bool account_invalid, account_failed; 474 bool writethrough, read_only; 475 BlockBackend *blk; 476 BlockDriverState *bs; 477 ThrottleConfig cfg; 478 int snapshot = 0; 479 Error *error = NULL; 480 QemuOpts *opts; 481 QDict *interval_dict = NULL; 482 QList *interval_list = NULL; 483 const char *id; 484 BlockdevDetectZeroesOptions detect_zeroes = 485 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 486 const char *throttling_group = NULL; 487 488 /* Check common options by copying from bs_opts to opts, all other options 489 * stay in bs_opts for processing by bdrv_open(). */ 490 id = qdict_get_try_str(bs_opts, "id"); 491 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 492 if (error) { 493 error_propagate(errp, error); 494 goto err_no_opts; 495 } 496 497 qemu_opts_absorb_qdict(opts, bs_opts, &error); 498 if (error) { 499 error_propagate(errp, error); 500 goto early_err; 501 } 502 503 if (id) { 504 qdict_del(bs_opts, "id"); 505 } 506 507 /* extract parameters */ 508 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 509 510 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 511 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 512 513 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 514 515 id = qemu_opts_id(opts); 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 qemu_printf("Supported formats:"); 536 bdrv_iterate_format(bdrv_format_print, NULL, false); 537 qemu_printf("\nSupported formats (read-only):"); 538 bdrv_iterate_format(bdrv_format_print, NULL, true); 539 qemu_printf("\n"); 540 goto early_err; 541 } 542 543 if (qdict_haskey(bs_opts, "driver")) { 544 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 545 goto early_err; 546 } 547 qdict_put_str(bs_opts, "driver", buf); 548 } 549 550 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 551 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 552 on_write_error = parse_block_error_action(buf, 0, &error); 553 if (error) { 554 error_propagate(errp, error); 555 goto early_err; 556 } 557 } 558 559 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 560 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 561 on_read_error = parse_block_error_action(buf, 1, &error); 562 if (error) { 563 error_propagate(errp, error); 564 goto early_err; 565 } 566 } 567 568 if (snapshot) { 569 bdrv_flags |= BDRV_O_SNAPSHOT; 570 } 571 572 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 573 574 /* init */ 575 if ((!file || !*file) && !qdict_size(bs_opts)) { 576 BlockBackendRootState *blk_rs; 577 578 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 579 blk_rs = blk_get_root_state(blk); 580 blk_rs->open_flags = bdrv_flags; 581 blk_rs->read_only = read_only; 582 blk_rs->detect_zeroes = detect_zeroes; 583 584 qobject_unref(bs_opts); 585 } else { 586 if (file && !*file) { 587 file = NULL; 588 } 589 590 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 591 * with other callers) rather than what we want as the real defaults. 592 * Apply the defaults here instead. */ 593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 594 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 595 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 596 read_only ? "on" : "off"); 597 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 598 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 599 600 if (runstate_check(RUN_STATE_INMIGRATE)) { 601 bdrv_flags |= BDRV_O_INACTIVE; 602 } 603 604 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 605 if (!blk) { 606 goto err_no_bs_opts; 607 } 608 bs = blk_bs(blk); 609 610 bs->detect_zeroes = detect_zeroes; 611 612 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 613 614 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 615 blk_unref(blk); 616 blk = NULL; 617 goto err_no_bs_opts; 618 } 619 } 620 621 /* disk I/O throttling */ 622 if (throttle_enabled(&cfg)) { 623 if (!throttling_group) { 624 throttling_group = id; 625 } 626 blk_io_limits_enable(blk, throttling_group); 627 blk_set_io_limits(blk, &cfg); 628 } 629 630 blk_set_enable_write_cache(blk, !writethrough); 631 blk_set_on_error(blk, on_read_error, on_write_error); 632 633 if (!monitor_add_blk(blk, id, errp)) { 634 blk_unref(blk); 635 blk = NULL; 636 goto err_no_bs_opts; 637 } 638 639 err_no_bs_opts: 640 qemu_opts_del(opts); 641 qobject_unref(interval_dict); 642 qobject_unref(interval_list); 643 return blk; 644 645 early_err: 646 qemu_opts_del(opts); 647 qobject_unref(interval_dict); 648 qobject_unref(interval_list); 649 err_no_opts: 650 qobject_unref(bs_opts); 651 return NULL; 652 } 653 654 /* Takes the ownership of bs_opts */ 655 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 656 { 657 int bdrv_flags = 0; 658 659 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 660 * with other callers) rather than what we want as the real defaults. 661 * Apply the defaults here instead. */ 662 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 663 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 664 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 665 666 if (runstate_check(RUN_STATE_INMIGRATE)) { 667 bdrv_flags |= BDRV_O_INACTIVE; 668 } 669 670 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 671 } 672 673 void blockdev_close_all_bdrv_states(void) 674 { 675 BlockDriverState *bs, *next_bs; 676 677 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 678 AioContext *ctx = bdrv_get_aio_context(bs); 679 680 aio_context_acquire(ctx); 681 bdrv_unref(bs); 682 aio_context_release(ctx); 683 } 684 } 685 686 /* Iterates over the list of monitor-owned BlockDriverStates */ 687 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 688 { 689 return bs ? QTAILQ_NEXT(bs, monitor_list) 690 : QTAILQ_FIRST(&monitor_bdrv_states); 691 } 692 693 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 694 Error **errp) 695 { 696 const char *value; 697 698 value = qemu_opt_get(opts, from); 699 if (value) { 700 if (qemu_opt_find(opts, to)) { 701 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 702 "same time", to, from); 703 return; 704 } 705 } 706 707 /* rename all items in opts */ 708 while ((value = qemu_opt_get(opts, from))) { 709 qemu_opt_set(opts, to, value, &error_abort); 710 qemu_opt_unset(opts, from); 711 } 712 } 713 714 QemuOptsList qemu_legacy_drive_opts = { 715 .name = "drive", 716 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 717 .desc = { 718 { 719 .name = "bus", 720 .type = QEMU_OPT_NUMBER, 721 .help = "bus number", 722 },{ 723 .name = "unit", 724 .type = QEMU_OPT_NUMBER, 725 .help = "unit number (i.e. lun for scsi)", 726 },{ 727 .name = "index", 728 .type = QEMU_OPT_NUMBER, 729 .help = "index number", 730 },{ 731 .name = "media", 732 .type = QEMU_OPT_STRING, 733 .help = "media type (disk, cdrom)", 734 },{ 735 .name = "if", 736 .type = QEMU_OPT_STRING, 737 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 738 },{ 739 .name = "file", 740 .type = QEMU_OPT_STRING, 741 .help = "file name", 742 }, 743 744 /* Options that are passed on, but have special semantics with -drive */ 745 { 746 .name = BDRV_OPT_READ_ONLY, 747 .type = QEMU_OPT_BOOL, 748 .help = "open drive file as read-only", 749 },{ 750 .name = "rerror", 751 .type = QEMU_OPT_STRING, 752 .help = "read error action", 753 },{ 754 .name = "werror", 755 .type = QEMU_OPT_STRING, 756 .help = "write error action", 757 },{ 758 .name = "copy-on-read", 759 .type = QEMU_OPT_BOOL, 760 .help = "copy read data from backing file into image file", 761 }, 762 763 { /* end of list */ } 764 }, 765 }; 766 767 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 768 Error **errp) 769 { 770 const char *value; 771 BlockBackend *blk; 772 DriveInfo *dinfo = NULL; 773 QDict *bs_opts; 774 QemuOpts *legacy_opts; 775 DriveMediaType media = MEDIA_DISK; 776 BlockInterfaceType type; 777 int max_devs, bus_id, unit_id, index; 778 const char *werror, *rerror; 779 bool read_only = false; 780 bool copy_on_read; 781 const char *filename; 782 Error *local_err = NULL; 783 int i; 784 785 /* Change legacy command line options into QMP ones */ 786 static const struct { 787 const char *from; 788 const char *to; 789 } opt_renames[] = { 790 { "iops", "throttling.iops-total" }, 791 { "iops_rd", "throttling.iops-read" }, 792 { "iops_wr", "throttling.iops-write" }, 793 794 { "bps", "throttling.bps-total" }, 795 { "bps_rd", "throttling.bps-read" }, 796 { "bps_wr", "throttling.bps-write" }, 797 798 { "iops_max", "throttling.iops-total-max" }, 799 { "iops_rd_max", "throttling.iops-read-max" }, 800 { "iops_wr_max", "throttling.iops-write-max" }, 801 802 { "bps_max", "throttling.bps-total-max" }, 803 { "bps_rd_max", "throttling.bps-read-max" }, 804 { "bps_wr_max", "throttling.bps-write-max" }, 805 806 { "iops_size", "throttling.iops-size" }, 807 808 { "group", "throttling.group" }, 809 810 { "readonly", BDRV_OPT_READ_ONLY }, 811 }; 812 813 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 814 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 815 &local_err); 816 if (local_err) { 817 error_propagate(errp, local_err); 818 return NULL; 819 } 820 } 821 822 value = qemu_opt_get(all_opts, "cache"); 823 if (value) { 824 int flags = 0; 825 bool writethrough; 826 827 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 828 error_setg(errp, "invalid cache option"); 829 return NULL; 830 } 831 832 /* Specific options take precedence */ 833 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 834 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 835 !writethrough, &error_abort); 836 } 837 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 838 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 839 !!(flags & BDRV_O_NOCACHE), &error_abort); 840 } 841 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 842 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 843 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 844 } 845 qemu_opt_unset(all_opts, "cache"); 846 } 847 848 /* Get a QDict for processing the options */ 849 bs_opts = qdict_new(); 850 qemu_opts_to_qdict(all_opts, bs_opts); 851 852 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 853 &error_abort); 854 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 855 if (local_err) { 856 error_propagate(errp, local_err); 857 goto fail; 858 } 859 860 /* Media type */ 861 value = qemu_opt_get(legacy_opts, "media"); 862 if (value) { 863 if (!strcmp(value, "disk")) { 864 media = MEDIA_DISK; 865 } else if (!strcmp(value, "cdrom")) { 866 media = MEDIA_CDROM; 867 read_only = true; 868 } else { 869 error_setg(errp, "'%s' invalid media", value); 870 goto fail; 871 } 872 } 873 874 /* copy-on-read is disabled with a warning for read-only devices */ 875 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 876 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 877 878 if (read_only && copy_on_read) { 879 warn_report("disabling copy-on-read on read-only drive"); 880 copy_on_read = false; 881 } 882 883 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 884 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 885 886 /* Controller type */ 887 value = qemu_opt_get(legacy_opts, "if"); 888 if (value) { 889 for (type = 0; 890 type < IF_COUNT && strcmp(value, if_name[type]); 891 type++) { 892 } 893 if (type == IF_COUNT) { 894 error_setg(errp, "unsupported bus type '%s'", value); 895 goto fail; 896 } 897 } else { 898 type = block_default_type; 899 } 900 901 /* Device address specified by bus/unit or index. 902 * If none was specified, try to find the first free one. */ 903 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 904 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 905 index = qemu_opt_get_number(legacy_opts, "index", -1); 906 907 max_devs = if_max_devs[type]; 908 909 if (index != -1) { 910 if (bus_id != 0 || unit_id != -1) { 911 error_setg(errp, "index cannot be used with bus and unit"); 912 goto fail; 913 } 914 bus_id = drive_index_to_bus_id(type, index); 915 unit_id = drive_index_to_unit_id(type, index); 916 } 917 918 if (unit_id == -1) { 919 unit_id = 0; 920 while (drive_get(type, bus_id, unit_id) != NULL) { 921 unit_id++; 922 if (max_devs && unit_id >= max_devs) { 923 unit_id -= max_devs; 924 bus_id++; 925 } 926 } 927 } 928 929 if (max_devs && unit_id >= max_devs) { 930 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 931 goto fail; 932 } 933 934 if (drive_get(type, bus_id, unit_id) != NULL) { 935 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 936 bus_id, unit_id, index); 937 goto fail; 938 } 939 940 /* no id supplied -> create one */ 941 if (qemu_opts_id(all_opts) == NULL) { 942 char *new_id; 943 const char *mediastr = ""; 944 if (type == IF_IDE || type == IF_SCSI) { 945 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 946 } 947 if (max_devs) { 948 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 949 mediastr, unit_id); 950 } else { 951 new_id = g_strdup_printf("%s%s%i", if_name[type], 952 mediastr, unit_id); 953 } 954 qdict_put_str(bs_opts, "id", new_id); 955 g_free(new_id); 956 } 957 958 /* Add virtio block device */ 959 if (type == IF_VIRTIO) { 960 QemuOpts *devopts; 961 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 962 &error_abort); 963 if (arch_type == QEMU_ARCH_S390X) { 964 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 965 } else { 966 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 967 } 968 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 969 &error_abort); 970 } 971 972 filename = qemu_opt_get(legacy_opts, "file"); 973 974 /* Check werror/rerror compatibility with if=... */ 975 werror = qemu_opt_get(legacy_opts, "werror"); 976 if (werror != NULL) { 977 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 978 type != IF_NONE) { 979 error_setg(errp, "werror is not supported by this bus type"); 980 goto fail; 981 } 982 qdict_put_str(bs_opts, "werror", werror); 983 } 984 985 rerror = qemu_opt_get(legacy_opts, "rerror"); 986 if (rerror != NULL) { 987 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 988 type != IF_NONE) { 989 error_setg(errp, "rerror is not supported by this bus type"); 990 goto fail; 991 } 992 qdict_put_str(bs_opts, "rerror", rerror); 993 } 994 995 /* Actual block device init: Functionality shared with blockdev-add */ 996 blk = blockdev_init(filename, bs_opts, &local_err); 997 bs_opts = NULL; 998 if (!blk) { 999 error_propagate(errp, local_err); 1000 goto fail; 1001 } else { 1002 assert(!local_err); 1003 } 1004 1005 /* Create legacy DriveInfo */ 1006 dinfo = g_malloc0(sizeof(*dinfo)); 1007 dinfo->opts = all_opts; 1008 1009 dinfo->type = type; 1010 dinfo->bus = bus_id; 1011 dinfo->unit = unit_id; 1012 1013 blk_set_legacy_dinfo(blk, dinfo); 1014 1015 switch(type) { 1016 case IF_IDE: 1017 case IF_SCSI: 1018 case IF_XEN: 1019 case IF_NONE: 1020 dinfo->media_cd = media == MEDIA_CDROM; 1021 break; 1022 default: 1023 break; 1024 } 1025 1026 fail: 1027 qemu_opts_del(legacy_opts); 1028 qobject_unref(bs_opts); 1029 return dinfo; 1030 } 1031 1032 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1033 { 1034 BlockDriverState *bs; 1035 1036 bs = bdrv_lookup_bs(name, name, errp); 1037 if (bs == NULL) { 1038 return NULL; 1039 } 1040 1041 if (!bdrv_is_root_node(bs)) { 1042 error_setg(errp, "Need a root block node"); 1043 return NULL; 1044 } 1045 1046 if (!bdrv_is_inserted(bs)) { 1047 error_setg(errp, "Device has no medium"); 1048 return NULL; 1049 } 1050 1051 return bs; 1052 } 1053 1054 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1055 Error **errp) 1056 { 1057 BlockBackend *blk; 1058 1059 if (!blk_name == !qdev_id) { 1060 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1061 return NULL; 1062 } 1063 1064 if (qdev_id) { 1065 blk = blk_by_qdev_id(qdev_id, errp); 1066 } else { 1067 blk = blk_by_name(blk_name); 1068 if (blk == NULL) { 1069 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1070 "Device '%s' not found", blk_name); 1071 } 1072 } 1073 1074 return blk; 1075 } 1076 1077 void hmp_commit(Monitor *mon, const QDict *qdict) 1078 { 1079 const char *device = qdict_get_str(qdict, "device"); 1080 BlockBackend *blk; 1081 int ret; 1082 1083 if (!strcmp(device, "all")) { 1084 ret = blk_commit_all(); 1085 } else { 1086 BlockDriverState *bs; 1087 AioContext *aio_context; 1088 1089 blk = blk_by_name(device); 1090 if (!blk) { 1091 monitor_printf(mon, "Device '%s' not found\n", device); 1092 return; 1093 } 1094 if (!blk_is_available(blk)) { 1095 monitor_printf(mon, "Device '%s' has no medium\n", device); 1096 return; 1097 } 1098 1099 bs = blk_bs(blk); 1100 aio_context = bdrv_get_aio_context(bs); 1101 aio_context_acquire(aio_context); 1102 1103 ret = bdrv_commit(bs); 1104 1105 aio_context_release(aio_context); 1106 } 1107 if (ret < 0) { 1108 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1109 strerror(-ret)); 1110 } 1111 } 1112 1113 static void blockdev_do_action(TransactionAction *action, Error **errp) 1114 { 1115 TransactionActionList list; 1116 1117 list.value = action; 1118 list.next = NULL; 1119 qmp_transaction(&list, false, NULL, errp); 1120 } 1121 1122 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1123 bool has_node_name, const char *node_name, 1124 const char *snapshot_file, 1125 bool has_snapshot_node_name, 1126 const char *snapshot_node_name, 1127 bool has_format, const char *format, 1128 bool has_mode, NewImageMode mode, Error **errp) 1129 { 1130 BlockdevSnapshotSync snapshot = { 1131 .has_device = has_device, 1132 .device = (char *) device, 1133 .has_node_name = has_node_name, 1134 .node_name = (char *) node_name, 1135 .snapshot_file = (char *) snapshot_file, 1136 .has_snapshot_node_name = has_snapshot_node_name, 1137 .snapshot_node_name = (char *) snapshot_node_name, 1138 .has_format = has_format, 1139 .format = (char *) format, 1140 .has_mode = has_mode, 1141 .mode = mode, 1142 }; 1143 TransactionAction action = { 1144 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1145 .u.blockdev_snapshot_sync.data = &snapshot, 1146 }; 1147 blockdev_do_action(&action, errp); 1148 } 1149 1150 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1151 Error **errp) 1152 { 1153 BlockdevSnapshot snapshot_data = { 1154 .node = (char *) node, 1155 .overlay = (char *) overlay 1156 }; 1157 TransactionAction action = { 1158 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1159 .u.blockdev_snapshot.data = &snapshot_data, 1160 }; 1161 blockdev_do_action(&action, errp); 1162 } 1163 1164 void qmp_blockdev_snapshot_internal_sync(const char *device, 1165 const char *name, 1166 Error **errp) 1167 { 1168 BlockdevSnapshotInternal snapshot = { 1169 .device = (char *) device, 1170 .name = (char *) name 1171 }; 1172 TransactionAction action = { 1173 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1174 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1175 }; 1176 blockdev_do_action(&action, errp); 1177 } 1178 1179 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1180 bool has_id, 1181 const char *id, 1182 bool has_name, 1183 const char *name, 1184 Error **errp) 1185 { 1186 BlockDriverState *bs; 1187 AioContext *aio_context; 1188 QEMUSnapshotInfo sn; 1189 Error *local_err = NULL; 1190 SnapshotInfo *info = NULL; 1191 int ret; 1192 1193 bs = qmp_get_root_bs(device, errp); 1194 if (!bs) { 1195 return NULL; 1196 } 1197 aio_context = bdrv_get_aio_context(bs); 1198 aio_context_acquire(aio_context); 1199 1200 if (!has_id) { 1201 id = NULL; 1202 } 1203 1204 if (!has_name) { 1205 name = NULL; 1206 } 1207 1208 if (!id && !name) { 1209 error_setg(errp, "Name or id must be provided"); 1210 goto out_aio_context; 1211 } 1212 1213 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1214 goto out_aio_context; 1215 } 1216 1217 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1218 if (local_err) { 1219 error_propagate(errp, local_err); 1220 goto out_aio_context; 1221 } 1222 if (!ret) { 1223 error_setg(errp, 1224 "Snapshot with id '%s' and name '%s' does not exist on " 1225 "device '%s'", 1226 STR_OR_NULL(id), STR_OR_NULL(name), device); 1227 goto out_aio_context; 1228 } 1229 1230 bdrv_snapshot_delete(bs, id, name, &local_err); 1231 if (local_err) { 1232 error_propagate(errp, local_err); 1233 goto out_aio_context; 1234 } 1235 1236 aio_context_release(aio_context); 1237 1238 info = g_new0(SnapshotInfo, 1); 1239 info->id = g_strdup(sn.id_str); 1240 info->name = g_strdup(sn.name); 1241 info->date_nsec = sn.date_nsec; 1242 info->date_sec = sn.date_sec; 1243 info->vm_state_size = sn.vm_state_size; 1244 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1245 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1246 1247 return info; 1248 1249 out_aio_context: 1250 aio_context_release(aio_context); 1251 return NULL; 1252 } 1253 1254 /** 1255 * block_dirty_bitmap_lookup: 1256 * Return a dirty bitmap (if present), after validating 1257 * the node reference and bitmap names. 1258 * 1259 * @node: The name of the BDS node to search for bitmaps 1260 * @name: The name of the bitmap to search for 1261 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1262 * @errp: Output pointer for error information. Can be NULL. 1263 * 1264 * @return: A bitmap object on success, or NULL on failure. 1265 */ 1266 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1267 const char *name, 1268 BlockDriverState **pbs, 1269 Error **errp) 1270 { 1271 BlockDriverState *bs; 1272 BdrvDirtyBitmap *bitmap; 1273 1274 if (!node) { 1275 error_setg(errp, "Node cannot be NULL"); 1276 return NULL; 1277 } 1278 if (!name) { 1279 error_setg(errp, "Bitmap name cannot be NULL"); 1280 return NULL; 1281 } 1282 bs = bdrv_lookup_bs(node, node, NULL); 1283 if (!bs) { 1284 error_setg(errp, "Node '%s' not found", node); 1285 return NULL; 1286 } 1287 1288 bitmap = bdrv_find_dirty_bitmap(bs, name); 1289 if (!bitmap) { 1290 error_setg(errp, "Dirty bitmap '%s' not found", name); 1291 return NULL; 1292 } 1293 1294 if (pbs) { 1295 *pbs = bs; 1296 } 1297 1298 return bitmap; 1299 } 1300 1301 /* New and old BlockDriverState structs for atomic group operations */ 1302 1303 typedef struct BlkActionState BlkActionState; 1304 1305 /** 1306 * BlkActionOps: 1307 * Table of operations that define an Action. 1308 * 1309 * @instance_size: Size of state struct, in bytes. 1310 * @prepare: Prepare the work, must NOT be NULL. 1311 * @commit: Commit the changes, can be NULL. 1312 * @abort: Abort the changes on fail, can be NULL. 1313 * @clean: Clean up resources after all transaction actions have called 1314 * commit() or abort(). Can be NULL. 1315 * 1316 * Only prepare() may fail. In a single transaction, only one of commit() or 1317 * abort() will be called. clean() will always be called if it is present. 1318 */ 1319 typedef struct BlkActionOps { 1320 size_t instance_size; 1321 void (*prepare)(BlkActionState *common, Error **errp); 1322 void (*commit)(BlkActionState *common); 1323 void (*abort)(BlkActionState *common); 1324 void (*clean)(BlkActionState *common); 1325 } BlkActionOps; 1326 1327 /** 1328 * BlkActionState: 1329 * Describes one Action's state within a Transaction. 1330 * 1331 * @action: QAPI-defined enum identifying which Action to perform. 1332 * @ops: Table of ActionOps this Action can perform. 1333 * @block_job_txn: Transaction which this action belongs to. 1334 * @entry: List membership for all Actions in this Transaction. 1335 * 1336 * This structure must be arranged as first member in a subclassed type, 1337 * assuming that the compiler will also arrange it to the same offsets as the 1338 * base class. 1339 */ 1340 struct BlkActionState { 1341 TransactionAction *action; 1342 const BlkActionOps *ops; 1343 JobTxn *block_job_txn; 1344 TransactionProperties *txn_props; 1345 QTAILQ_ENTRY(BlkActionState) entry; 1346 }; 1347 1348 /* internal snapshot private data */ 1349 typedef struct InternalSnapshotState { 1350 BlkActionState common; 1351 BlockDriverState *bs; 1352 QEMUSnapshotInfo sn; 1353 bool created; 1354 } InternalSnapshotState; 1355 1356 1357 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1358 { 1359 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1360 error_setg(errp, 1361 "Action '%s' does not support Transaction property " 1362 "completion-mode = %s", 1363 TransactionActionKind_str(s->action->type), 1364 ActionCompletionMode_str(s->txn_props->completion_mode)); 1365 return -1; 1366 } 1367 return 0; 1368 } 1369 1370 static void internal_snapshot_prepare(BlkActionState *common, 1371 Error **errp) 1372 { 1373 Error *local_err = NULL; 1374 const char *device; 1375 const char *name; 1376 BlockDriverState *bs; 1377 QEMUSnapshotInfo old_sn, *sn; 1378 bool ret; 1379 qemu_timeval tv; 1380 BlockdevSnapshotInternal *internal; 1381 InternalSnapshotState *state; 1382 AioContext *aio_context; 1383 int ret1; 1384 1385 g_assert(common->action->type == 1386 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1387 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1388 state = DO_UPCAST(InternalSnapshotState, common, common); 1389 1390 /* 1. parse input */ 1391 device = internal->device; 1392 name = internal->name; 1393 1394 /* 2. check for validation */ 1395 if (action_check_completion_mode(common, errp) < 0) { 1396 return; 1397 } 1398 1399 bs = qmp_get_root_bs(device, errp); 1400 if (!bs) { 1401 return; 1402 } 1403 1404 aio_context = bdrv_get_aio_context(bs); 1405 aio_context_acquire(aio_context); 1406 1407 state->bs = bs; 1408 1409 /* Paired with .clean() */ 1410 bdrv_drained_begin(bs); 1411 1412 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1413 goto out; 1414 } 1415 1416 if (bdrv_is_read_only(bs)) { 1417 error_setg(errp, "Device '%s' is read only", device); 1418 goto out; 1419 } 1420 1421 if (!bdrv_can_snapshot(bs)) { 1422 error_setg(errp, "Block format '%s' used by device '%s' " 1423 "does not support internal snapshots", 1424 bs->drv->format_name, device); 1425 goto out; 1426 } 1427 1428 if (!strlen(name)) { 1429 error_setg(errp, "Name is empty"); 1430 goto out; 1431 } 1432 1433 /* check whether a snapshot with name exist */ 1434 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1435 &local_err); 1436 if (local_err) { 1437 error_propagate(errp, local_err); 1438 goto out; 1439 } else if (ret) { 1440 error_setg(errp, 1441 "Snapshot with name '%s' already exists on device '%s'", 1442 name, device); 1443 goto out; 1444 } 1445 1446 /* 3. take the snapshot */ 1447 sn = &state->sn; 1448 pstrcpy(sn->name, sizeof(sn->name), name); 1449 qemu_gettimeofday(&tv); 1450 sn->date_sec = tv.tv_sec; 1451 sn->date_nsec = tv.tv_usec * 1000; 1452 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1453 1454 ret1 = bdrv_snapshot_create(bs, sn); 1455 if (ret1 < 0) { 1456 error_setg_errno(errp, -ret1, 1457 "Failed to create snapshot '%s' on device '%s'", 1458 name, device); 1459 goto out; 1460 } 1461 1462 /* 4. succeed, mark a snapshot is created */ 1463 state->created = true; 1464 1465 out: 1466 aio_context_release(aio_context); 1467 } 1468 1469 static void internal_snapshot_abort(BlkActionState *common) 1470 { 1471 InternalSnapshotState *state = 1472 DO_UPCAST(InternalSnapshotState, common, common); 1473 BlockDriverState *bs = state->bs; 1474 QEMUSnapshotInfo *sn = &state->sn; 1475 AioContext *aio_context; 1476 Error *local_error = NULL; 1477 1478 if (!state->created) { 1479 return; 1480 } 1481 1482 aio_context = bdrv_get_aio_context(state->bs); 1483 aio_context_acquire(aio_context); 1484 1485 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1486 error_reportf_err(local_error, 1487 "Failed to delete snapshot with id '%s' and " 1488 "name '%s' on device '%s' in abort: ", 1489 sn->id_str, sn->name, 1490 bdrv_get_device_name(bs)); 1491 } 1492 1493 aio_context_release(aio_context); 1494 } 1495 1496 static void internal_snapshot_clean(BlkActionState *common) 1497 { 1498 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1499 common, common); 1500 AioContext *aio_context; 1501 1502 if (!state->bs) { 1503 return; 1504 } 1505 1506 aio_context = bdrv_get_aio_context(state->bs); 1507 aio_context_acquire(aio_context); 1508 1509 bdrv_drained_end(state->bs); 1510 1511 aio_context_release(aio_context); 1512 } 1513 1514 /* external snapshot private data */ 1515 typedef struct ExternalSnapshotState { 1516 BlkActionState common; 1517 BlockDriverState *old_bs; 1518 BlockDriverState *new_bs; 1519 bool overlay_appended; 1520 } ExternalSnapshotState; 1521 1522 static void external_snapshot_prepare(BlkActionState *common, 1523 Error **errp) 1524 { 1525 int flags = 0; 1526 QDict *options = NULL; 1527 Error *local_err = NULL; 1528 /* Device and node name of the image to generate the snapshot from */ 1529 const char *device; 1530 const char *node_name; 1531 /* Reference to the new image (for 'blockdev-snapshot') */ 1532 const char *snapshot_ref; 1533 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1534 const char *new_image_file; 1535 ExternalSnapshotState *state = 1536 DO_UPCAST(ExternalSnapshotState, common, common); 1537 TransactionAction *action = common->action; 1538 AioContext *aio_context; 1539 int ret; 1540 1541 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1542 * purpose but a different set of parameters */ 1543 switch (action->type) { 1544 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1545 { 1546 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1547 device = s->node; 1548 node_name = s->node; 1549 new_image_file = NULL; 1550 snapshot_ref = s->overlay; 1551 } 1552 break; 1553 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1554 { 1555 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1556 device = s->has_device ? s->device : NULL; 1557 node_name = s->has_node_name ? s->node_name : NULL; 1558 new_image_file = s->snapshot_file; 1559 snapshot_ref = NULL; 1560 } 1561 break; 1562 default: 1563 g_assert_not_reached(); 1564 } 1565 1566 /* start processing */ 1567 if (action_check_completion_mode(common, errp) < 0) { 1568 return; 1569 } 1570 1571 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1572 if (!state->old_bs) { 1573 return; 1574 } 1575 1576 aio_context = bdrv_get_aio_context(state->old_bs); 1577 aio_context_acquire(aio_context); 1578 1579 /* Paired with .clean() */ 1580 bdrv_drained_begin(state->old_bs); 1581 1582 if (!bdrv_is_inserted(state->old_bs)) { 1583 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1584 goto out; 1585 } 1586 1587 if (bdrv_op_is_blocked(state->old_bs, 1588 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1589 goto out; 1590 } 1591 1592 if (!bdrv_is_read_only(state->old_bs)) { 1593 if (bdrv_flush(state->old_bs)) { 1594 error_setg(errp, QERR_IO_ERROR); 1595 goto out; 1596 } 1597 } 1598 1599 if (!bdrv_is_first_non_filter(state->old_bs)) { 1600 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1601 goto out; 1602 } 1603 1604 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1605 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1606 const char *format = s->has_format ? s->format : "qcow2"; 1607 enum NewImageMode mode; 1608 const char *snapshot_node_name = 1609 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1610 1611 if (node_name && !snapshot_node_name) { 1612 error_setg(errp, "New overlay node name missing"); 1613 goto out; 1614 } 1615 1616 if (snapshot_node_name && 1617 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1618 error_setg(errp, "New overlay node name already in use"); 1619 goto out; 1620 } 1621 1622 flags = state->old_bs->open_flags; 1623 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1624 flags |= BDRV_O_NO_BACKING; 1625 1626 /* create new image w/backing file */ 1627 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1628 if (mode != NEW_IMAGE_MODE_EXISTING) { 1629 int64_t size = bdrv_getlength(state->old_bs); 1630 if (size < 0) { 1631 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1632 goto out; 1633 } 1634 bdrv_refresh_filename(state->old_bs); 1635 bdrv_img_create(new_image_file, format, 1636 state->old_bs->filename, 1637 state->old_bs->drv->format_name, 1638 NULL, size, flags, false, &local_err); 1639 if (local_err) { 1640 error_propagate(errp, local_err); 1641 goto out; 1642 } 1643 } 1644 1645 options = qdict_new(); 1646 if (snapshot_node_name) { 1647 qdict_put_str(options, "node-name", snapshot_node_name); 1648 } 1649 qdict_put_str(options, "driver", format); 1650 } 1651 1652 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1653 errp); 1654 /* We will manually add the backing_hd field to the bs later */ 1655 if (!state->new_bs) { 1656 goto out; 1657 } 1658 1659 if (bdrv_has_blk(state->new_bs)) { 1660 error_setg(errp, "The overlay is already in use"); 1661 goto out; 1662 } 1663 1664 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1665 errp)) { 1666 goto out; 1667 } 1668 1669 if (state->new_bs->backing != NULL) { 1670 error_setg(errp, "The overlay already has a backing image"); 1671 goto out; 1672 } 1673 1674 if (!state->new_bs->drv->supports_backing) { 1675 error_setg(errp, "The overlay does not support backing images"); 1676 goto out; 1677 } 1678 1679 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp); 1680 if (ret < 0) { 1681 goto out; 1682 } 1683 1684 /* This removes our old bs and adds the new bs. This is an operation that 1685 * can fail, so we need to do it in .prepare; undoing it for abort is 1686 * always possible. */ 1687 bdrv_ref(state->new_bs); 1688 bdrv_append(state->new_bs, state->old_bs, &local_err); 1689 if (local_err) { 1690 error_propagate(errp, local_err); 1691 goto out; 1692 } 1693 state->overlay_appended = true; 1694 1695 out: 1696 aio_context_release(aio_context); 1697 } 1698 1699 static void external_snapshot_commit(BlkActionState *common) 1700 { 1701 ExternalSnapshotState *state = 1702 DO_UPCAST(ExternalSnapshotState, common, common); 1703 AioContext *aio_context; 1704 1705 aio_context = bdrv_get_aio_context(state->old_bs); 1706 aio_context_acquire(aio_context); 1707 1708 /* We don't need (or want) to use the transactional 1709 * bdrv_reopen_multiple() across all the entries at once, because we 1710 * don't want to abort all of them if one of them fails the reopen */ 1711 if (!atomic_read(&state->old_bs->copy_on_read)) { 1712 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1713 } 1714 1715 aio_context_release(aio_context); 1716 } 1717 1718 static void external_snapshot_abort(BlkActionState *common) 1719 { 1720 ExternalSnapshotState *state = 1721 DO_UPCAST(ExternalSnapshotState, common, common); 1722 if (state->new_bs) { 1723 if (state->overlay_appended) { 1724 AioContext *aio_context; 1725 1726 aio_context = bdrv_get_aio_context(state->old_bs); 1727 aio_context_acquire(aio_context); 1728 1729 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1730 close state->old_bs; we need it */ 1731 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1732 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1733 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1734 1735 aio_context_release(aio_context); 1736 } 1737 } 1738 } 1739 1740 static void external_snapshot_clean(BlkActionState *common) 1741 { 1742 ExternalSnapshotState *state = 1743 DO_UPCAST(ExternalSnapshotState, common, common); 1744 AioContext *aio_context; 1745 1746 if (!state->old_bs) { 1747 return; 1748 } 1749 1750 aio_context = bdrv_get_aio_context(state->old_bs); 1751 aio_context_acquire(aio_context); 1752 1753 bdrv_drained_end(state->old_bs); 1754 bdrv_unref(state->new_bs); 1755 1756 aio_context_release(aio_context); 1757 } 1758 1759 typedef struct DriveBackupState { 1760 BlkActionState common; 1761 BlockDriverState *bs; 1762 BlockJob *job; 1763 } DriveBackupState; 1764 1765 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1766 Error **errp); 1767 1768 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1769 { 1770 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1771 BlockDriverState *bs; 1772 DriveBackup *backup; 1773 AioContext *aio_context; 1774 Error *local_err = NULL; 1775 1776 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1777 backup = common->action->u.drive_backup.data; 1778 1779 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1780 if (!bs) { 1781 return; 1782 } 1783 1784 aio_context = bdrv_get_aio_context(bs); 1785 aio_context_acquire(aio_context); 1786 1787 /* Paired with .clean() */ 1788 bdrv_drained_begin(bs); 1789 1790 state->bs = bs; 1791 1792 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1793 if (local_err) { 1794 error_propagate(errp, local_err); 1795 goto out; 1796 } 1797 1798 out: 1799 aio_context_release(aio_context); 1800 } 1801 1802 static void drive_backup_commit(BlkActionState *common) 1803 { 1804 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1805 AioContext *aio_context; 1806 1807 aio_context = bdrv_get_aio_context(state->bs); 1808 aio_context_acquire(aio_context); 1809 1810 assert(state->job); 1811 job_start(&state->job->job); 1812 1813 aio_context_release(aio_context); 1814 } 1815 1816 static void drive_backup_abort(BlkActionState *common) 1817 { 1818 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1819 1820 if (state->job) { 1821 AioContext *aio_context; 1822 1823 aio_context = bdrv_get_aio_context(state->bs); 1824 aio_context_acquire(aio_context); 1825 1826 job_cancel_sync(&state->job->job); 1827 1828 aio_context_release(aio_context); 1829 } 1830 } 1831 1832 static void drive_backup_clean(BlkActionState *common) 1833 { 1834 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1835 AioContext *aio_context; 1836 1837 if (!state->bs) { 1838 return; 1839 } 1840 1841 aio_context = bdrv_get_aio_context(state->bs); 1842 aio_context_acquire(aio_context); 1843 1844 bdrv_drained_end(state->bs); 1845 1846 aio_context_release(aio_context); 1847 } 1848 1849 typedef struct BlockdevBackupState { 1850 BlkActionState common; 1851 BlockDriverState *bs; 1852 BlockJob *job; 1853 } BlockdevBackupState; 1854 1855 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1856 Error **errp); 1857 1858 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1859 { 1860 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1861 BlockdevBackup *backup; 1862 BlockDriverState *bs, *target; 1863 AioContext *aio_context; 1864 Error *local_err = NULL; 1865 1866 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1867 backup = common->action->u.blockdev_backup.data; 1868 1869 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1870 if (!bs) { 1871 return; 1872 } 1873 1874 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1875 if (!target) { 1876 return; 1877 } 1878 1879 aio_context = bdrv_get_aio_context(bs); 1880 aio_context_acquire(aio_context); 1881 state->bs = bs; 1882 1883 /* Paired with .clean() */ 1884 bdrv_drained_begin(state->bs); 1885 1886 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1887 if (local_err) { 1888 error_propagate(errp, local_err); 1889 goto out; 1890 } 1891 1892 out: 1893 aio_context_release(aio_context); 1894 } 1895 1896 static void blockdev_backup_commit(BlkActionState *common) 1897 { 1898 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1899 AioContext *aio_context; 1900 1901 aio_context = bdrv_get_aio_context(state->bs); 1902 aio_context_acquire(aio_context); 1903 1904 assert(state->job); 1905 job_start(&state->job->job); 1906 1907 aio_context_release(aio_context); 1908 } 1909 1910 static void blockdev_backup_abort(BlkActionState *common) 1911 { 1912 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1913 1914 if (state->job) { 1915 AioContext *aio_context; 1916 1917 aio_context = bdrv_get_aio_context(state->bs); 1918 aio_context_acquire(aio_context); 1919 1920 job_cancel_sync(&state->job->job); 1921 1922 aio_context_release(aio_context); 1923 } 1924 } 1925 1926 static void blockdev_backup_clean(BlkActionState *common) 1927 { 1928 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1929 AioContext *aio_context; 1930 1931 if (!state->bs) { 1932 return; 1933 } 1934 1935 aio_context = bdrv_get_aio_context(state->bs); 1936 aio_context_acquire(aio_context); 1937 1938 bdrv_drained_end(state->bs); 1939 1940 aio_context_release(aio_context); 1941 } 1942 1943 typedef struct BlockDirtyBitmapState { 1944 BlkActionState common; 1945 BdrvDirtyBitmap *bitmap; 1946 BlockDriverState *bs; 1947 HBitmap *backup; 1948 bool prepared; 1949 bool was_enabled; 1950 } BlockDirtyBitmapState; 1951 1952 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1953 Error **errp) 1954 { 1955 Error *local_err = NULL; 1956 BlockDirtyBitmapAdd *action; 1957 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1958 common, common); 1959 1960 if (action_check_completion_mode(common, errp) < 0) { 1961 return; 1962 } 1963 1964 action = common->action->u.block_dirty_bitmap_add.data; 1965 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1966 qmp_block_dirty_bitmap_add(action->node, action->name, 1967 action->has_granularity, action->granularity, 1968 action->has_persistent, action->persistent, 1969 action->has_autoload, action->autoload, 1970 action->has_disabled, action->disabled, 1971 &local_err); 1972 1973 if (!local_err) { 1974 state->prepared = true; 1975 } else { 1976 error_propagate(errp, local_err); 1977 } 1978 } 1979 1980 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1981 { 1982 BlockDirtyBitmapAdd *action; 1983 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1984 common, common); 1985 1986 action = common->action->u.block_dirty_bitmap_add.data; 1987 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1988 * then the node reference and bitmap name must have been valid. 1989 */ 1990 if (state->prepared) { 1991 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1992 } 1993 } 1994 1995 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1996 Error **errp) 1997 { 1998 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1999 common, common); 2000 BlockDirtyBitmap *action; 2001 2002 if (action_check_completion_mode(common, errp) < 0) { 2003 return; 2004 } 2005 2006 action = common->action->u.block_dirty_bitmap_clear.data; 2007 state->bitmap = block_dirty_bitmap_lookup(action->node, 2008 action->name, 2009 &state->bs, 2010 errp); 2011 if (!state->bitmap) { 2012 return; 2013 } 2014 2015 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2016 return; 2017 } 2018 2019 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2020 } 2021 2022 static void block_dirty_bitmap_restore(BlkActionState *common) 2023 { 2024 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2025 common, common); 2026 2027 if (state->backup) { 2028 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2029 } 2030 } 2031 2032 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2033 { 2034 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2035 common, common); 2036 2037 hbitmap_free(state->backup); 2038 } 2039 2040 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2041 Error **errp) 2042 { 2043 BlockDirtyBitmap *action; 2044 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2045 common, common); 2046 2047 if (action_check_completion_mode(common, errp) < 0) { 2048 return; 2049 } 2050 2051 action = common->action->u.block_dirty_bitmap_enable.data; 2052 state->bitmap = block_dirty_bitmap_lookup(action->node, 2053 action->name, 2054 NULL, 2055 errp); 2056 if (!state->bitmap) { 2057 return; 2058 } 2059 2060 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2061 return; 2062 } 2063 2064 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2065 bdrv_enable_dirty_bitmap(state->bitmap); 2066 } 2067 2068 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2069 { 2070 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2071 common, common); 2072 2073 if (!state->was_enabled) { 2074 bdrv_disable_dirty_bitmap(state->bitmap); 2075 } 2076 } 2077 2078 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2079 Error **errp) 2080 { 2081 BlockDirtyBitmap *action; 2082 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2083 common, common); 2084 2085 if (action_check_completion_mode(common, errp) < 0) { 2086 return; 2087 } 2088 2089 action = common->action->u.block_dirty_bitmap_disable.data; 2090 state->bitmap = block_dirty_bitmap_lookup(action->node, 2091 action->name, 2092 NULL, 2093 errp); 2094 if (!state->bitmap) { 2095 return; 2096 } 2097 2098 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2099 return; 2100 } 2101 2102 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2103 bdrv_disable_dirty_bitmap(state->bitmap); 2104 } 2105 2106 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2107 { 2108 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2109 common, common); 2110 2111 if (state->was_enabled) { 2112 bdrv_enable_dirty_bitmap(state->bitmap); 2113 } 2114 } 2115 2116 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2117 const char *node, const char *target, 2118 BlockDirtyBitmapMergeSourceList *bitmaps, 2119 HBitmap **backup, Error **errp); 2120 2121 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2122 Error **errp) 2123 { 2124 BlockDirtyBitmapMerge *action; 2125 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2126 common, common); 2127 2128 if (action_check_completion_mode(common, errp) < 0) { 2129 return; 2130 } 2131 2132 action = common->action->u.block_dirty_bitmap_merge.data; 2133 2134 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2135 action->bitmaps, &state->backup, 2136 errp); 2137 } 2138 2139 static void abort_prepare(BlkActionState *common, Error **errp) 2140 { 2141 error_setg(errp, "Transaction aborted using Abort action"); 2142 } 2143 2144 static void abort_commit(BlkActionState *common) 2145 { 2146 g_assert_not_reached(); /* this action never succeeds */ 2147 } 2148 2149 static const BlkActionOps actions[] = { 2150 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2151 .instance_size = sizeof(ExternalSnapshotState), 2152 .prepare = external_snapshot_prepare, 2153 .commit = external_snapshot_commit, 2154 .abort = external_snapshot_abort, 2155 .clean = external_snapshot_clean, 2156 }, 2157 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2158 .instance_size = sizeof(ExternalSnapshotState), 2159 .prepare = external_snapshot_prepare, 2160 .commit = external_snapshot_commit, 2161 .abort = external_snapshot_abort, 2162 .clean = external_snapshot_clean, 2163 }, 2164 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2165 .instance_size = sizeof(DriveBackupState), 2166 .prepare = drive_backup_prepare, 2167 .commit = drive_backup_commit, 2168 .abort = drive_backup_abort, 2169 .clean = drive_backup_clean, 2170 }, 2171 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2172 .instance_size = sizeof(BlockdevBackupState), 2173 .prepare = blockdev_backup_prepare, 2174 .commit = blockdev_backup_commit, 2175 .abort = blockdev_backup_abort, 2176 .clean = blockdev_backup_clean, 2177 }, 2178 [TRANSACTION_ACTION_KIND_ABORT] = { 2179 .instance_size = sizeof(BlkActionState), 2180 .prepare = abort_prepare, 2181 .commit = abort_commit, 2182 }, 2183 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2184 .instance_size = sizeof(InternalSnapshotState), 2185 .prepare = internal_snapshot_prepare, 2186 .abort = internal_snapshot_abort, 2187 .clean = internal_snapshot_clean, 2188 }, 2189 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2190 .instance_size = sizeof(BlockDirtyBitmapState), 2191 .prepare = block_dirty_bitmap_add_prepare, 2192 .abort = block_dirty_bitmap_add_abort, 2193 }, 2194 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2195 .instance_size = sizeof(BlockDirtyBitmapState), 2196 .prepare = block_dirty_bitmap_clear_prepare, 2197 .commit = block_dirty_bitmap_free_backup, 2198 .abort = block_dirty_bitmap_restore, 2199 }, 2200 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2201 .instance_size = sizeof(BlockDirtyBitmapState), 2202 .prepare = block_dirty_bitmap_enable_prepare, 2203 .abort = block_dirty_bitmap_enable_abort, 2204 }, 2205 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2206 .instance_size = sizeof(BlockDirtyBitmapState), 2207 .prepare = block_dirty_bitmap_disable_prepare, 2208 .abort = block_dirty_bitmap_disable_abort, 2209 }, 2210 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2211 .instance_size = sizeof(BlockDirtyBitmapState), 2212 .prepare = block_dirty_bitmap_merge_prepare, 2213 .commit = block_dirty_bitmap_free_backup, 2214 .abort = block_dirty_bitmap_restore, 2215 }, 2216 /* Where are transactions for MIRROR, COMMIT and STREAM? 2217 * Although these blockjobs use transaction callbacks like the backup job, 2218 * these jobs do not necessarily adhere to transaction semantics. 2219 * These jobs may not fully undo all of their actions on abort, nor do they 2220 * necessarily work in transactions with more than one job in them. 2221 */ 2222 }; 2223 2224 /** 2225 * Allocate a TransactionProperties structure if necessary, and fill 2226 * that structure with desired defaults if they are unset. 2227 */ 2228 static TransactionProperties *get_transaction_properties( 2229 TransactionProperties *props) 2230 { 2231 if (!props) { 2232 props = g_new0(TransactionProperties, 1); 2233 } 2234 2235 if (!props->has_completion_mode) { 2236 props->has_completion_mode = true; 2237 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2238 } 2239 2240 return props; 2241 } 2242 2243 /* 2244 * 'Atomic' group operations. The operations are performed as a set, and if 2245 * any fail then we roll back all operations in the group. 2246 */ 2247 void qmp_transaction(TransactionActionList *dev_list, 2248 bool has_props, 2249 struct TransactionProperties *props, 2250 Error **errp) 2251 { 2252 TransactionActionList *dev_entry = dev_list; 2253 JobTxn *block_job_txn = NULL; 2254 BlkActionState *state, *next; 2255 Error *local_err = NULL; 2256 2257 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2258 QTAILQ_INIT(&snap_bdrv_states); 2259 2260 /* Does this transaction get canceled as a group on failure? 2261 * If not, we don't really need to make a JobTxn. 2262 */ 2263 props = get_transaction_properties(props); 2264 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2265 block_job_txn = job_txn_new(); 2266 } 2267 2268 /* drain all i/o before any operations */ 2269 bdrv_drain_all(); 2270 2271 /* We don't do anything in this loop that commits us to the operations */ 2272 while (NULL != dev_entry) { 2273 TransactionAction *dev_info = NULL; 2274 const BlkActionOps *ops; 2275 2276 dev_info = dev_entry->value; 2277 dev_entry = dev_entry->next; 2278 2279 assert(dev_info->type < ARRAY_SIZE(actions)); 2280 2281 ops = &actions[dev_info->type]; 2282 assert(ops->instance_size > 0); 2283 2284 state = g_malloc0(ops->instance_size); 2285 state->ops = ops; 2286 state->action = dev_info; 2287 state->block_job_txn = block_job_txn; 2288 state->txn_props = props; 2289 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2290 2291 state->ops->prepare(state, &local_err); 2292 if (local_err) { 2293 error_propagate(errp, local_err); 2294 goto delete_and_fail; 2295 } 2296 } 2297 2298 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2299 if (state->ops->commit) { 2300 state->ops->commit(state); 2301 } 2302 } 2303 2304 /* success */ 2305 goto exit; 2306 2307 delete_and_fail: 2308 /* failure, and it is all-or-none; roll back all operations */ 2309 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2310 if (state->ops->abort) { 2311 state->ops->abort(state); 2312 } 2313 } 2314 exit: 2315 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2316 if (state->ops->clean) { 2317 state->ops->clean(state); 2318 } 2319 g_free(state); 2320 } 2321 if (!has_props) { 2322 qapi_free_TransactionProperties(props); 2323 } 2324 job_txn_unref(block_job_txn); 2325 } 2326 2327 void qmp_eject(bool has_device, const char *device, 2328 bool has_id, const char *id, 2329 bool has_force, bool force, Error **errp) 2330 { 2331 Error *local_err = NULL; 2332 int rc; 2333 2334 if (!has_force) { 2335 force = false; 2336 } 2337 2338 rc = do_open_tray(has_device ? device : NULL, 2339 has_id ? id : NULL, 2340 force, &local_err); 2341 if (rc && rc != -ENOSYS) { 2342 error_propagate(errp, local_err); 2343 return; 2344 } 2345 error_free(local_err); 2346 2347 blockdev_remove_medium(has_device, device, has_id, id, errp); 2348 } 2349 2350 void qmp_block_passwd(bool has_device, const char *device, 2351 bool has_node_name, const char *node_name, 2352 const char *password, Error **errp) 2353 { 2354 error_setg(errp, 2355 "Setting block passwords directly is no longer supported"); 2356 } 2357 2358 /* 2359 * Attempt to open the tray of @device. 2360 * If @force, ignore its tray lock. 2361 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2362 * On error, store an error through @errp and return -errno. 2363 * If @device does not exist, return -ENODEV. 2364 * If it has no removable media, return -ENOTSUP. 2365 * If it has no tray, return -ENOSYS. 2366 * If the guest was asked to open the tray, return -EINPROGRESS. 2367 * Else, return 0. 2368 */ 2369 static int do_open_tray(const char *blk_name, const char *qdev_id, 2370 bool force, Error **errp) 2371 { 2372 BlockBackend *blk; 2373 const char *device = qdev_id ?: blk_name; 2374 bool locked; 2375 2376 blk = qmp_get_blk(blk_name, qdev_id, errp); 2377 if (!blk) { 2378 return -ENODEV; 2379 } 2380 2381 if (!blk_dev_has_removable_media(blk)) { 2382 error_setg(errp, "Device '%s' is not removable", device); 2383 return -ENOTSUP; 2384 } 2385 2386 if (!blk_dev_has_tray(blk)) { 2387 error_setg(errp, "Device '%s' does not have a tray", device); 2388 return -ENOSYS; 2389 } 2390 2391 if (blk_dev_is_tray_open(blk)) { 2392 return 0; 2393 } 2394 2395 locked = blk_dev_is_medium_locked(blk); 2396 if (locked) { 2397 blk_dev_eject_request(blk, force); 2398 } 2399 2400 if (!locked || force) { 2401 blk_dev_change_media_cb(blk, false, &error_abort); 2402 } 2403 2404 if (locked && !force) { 2405 error_setg(errp, "Device '%s' is locked and force was not specified, " 2406 "wait for tray to open and try again", device); 2407 return -EINPROGRESS; 2408 } 2409 2410 return 0; 2411 } 2412 2413 void qmp_blockdev_open_tray(bool has_device, const char *device, 2414 bool has_id, const char *id, 2415 bool has_force, bool force, 2416 Error **errp) 2417 { 2418 Error *local_err = NULL; 2419 int rc; 2420 2421 if (!has_force) { 2422 force = false; 2423 } 2424 rc = do_open_tray(has_device ? device : NULL, 2425 has_id ? id : NULL, 2426 force, &local_err); 2427 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2428 error_propagate(errp, local_err); 2429 return; 2430 } 2431 error_free(local_err); 2432 } 2433 2434 void qmp_blockdev_close_tray(bool has_device, const char *device, 2435 bool has_id, const char *id, 2436 Error **errp) 2437 { 2438 BlockBackend *blk; 2439 Error *local_err = NULL; 2440 2441 device = has_device ? device : NULL; 2442 id = has_id ? id : NULL; 2443 2444 blk = qmp_get_blk(device, id, errp); 2445 if (!blk) { 2446 return; 2447 } 2448 2449 if (!blk_dev_has_removable_media(blk)) { 2450 error_setg(errp, "Device '%s' is not removable", device ?: id); 2451 return; 2452 } 2453 2454 if (!blk_dev_has_tray(blk)) { 2455 /* Ignore this command on tray-less devices */ 2456 return; 2457 } 2458 2459 if (!blk_dev_is_tray_open(blk)) { 2460 return; 2461 } 2462 2463 blk_dev_change_media_cb(blk, true, &local_err); 2464 if (local_err) { 2465 error_propagate(errp, local_err); 2466 return; 2467 } 2468 } 2469 2470 static void blockdev_remove_medium(bool has_device, const char *device, 2471 bool has_id, const char *id, Error **errp) 2472 { 2473 BlockBackend *blk; 2474 BlockDriverState *bs; 2475 AioContext *aio_context; 2476 bool has_attached_device; 2477 2478 device = has_device ? device : NULL; 2479 id = has_id ? id : NULL; 2480 2481 blk = qmp_get_blk(device, id, errp); 2482 if (!blk) { 2483 return; 2484 } 2485 2486 /* For BBs without a device, we can exchange the BDS tree at will */ 2487 has_attached_device = blk_get_attached_dev(blk); 2488 2489 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2490 error_setg(errp, "Device '%s' is not removable", device ?: id); 2491 return; 2492 } 2493 2494 if (has_attached_device && blk_dev_has_tray(blk) && 2495 !blk_dev_is_tray_open(blk)) 2496 { 2497 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2498 return; 2499 } 2500 2501 bs = blk_bs(blk); 2502 if (!bs) { 2503 return; 2504 } 2505 2506 aio_context = bdrv_get_aio_context(bs); 2507 aio_context_acquire(aio_context); 2508 2509 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2510 goto out; 2511 } 2512 2513 blk_remove_bs(blk); 2514 2515 if (!blk_dev_has_tray(blk)) { 2516 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2517 * called at all); therefore, the medium needs to be ejected here. 2518 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2519 * value passed here (i.e. false). */ 2520 blk_dev_change_media_cb(blk, false, &error_abort); 2521 } 2522 2523 out: 2524 aio_context_release(aio_context); 2525 } 2526 2527 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2528 { 2529 blockdev_remove_medium(false, NULL, true, id, errp); 2530 } 2531 2532 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2533 BlockDriverState *bs, Error **errp) 2534 { 2535 Error *local_err = NULL; 2536 bool has_device; 2537 int ret; 2538 2539 /* For BBs without a device, we can exchange the BDS tree at will */ 2540 has_device = blk_get_attached_dev(blk); 2541 2542 if (has_device && !blk_dev_has_removable_media(blk)) { 2543 error_setg(errp, "Device is not removable"); 2544 return; 2545 } 2546 2547 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2548 error_setg(errp, "Tray of the device is not open"); 2549 return; 2550 } 2551 2552 if (blk_bs(blk)) { 2553 error_setg(errp, "There already is a medium in the device"); 2554 return; 2555 } 2556 2557 ret = blk_insert_bs(blk, bs, errp); 2558 if (ret < 0) { 2559 return; 2560 } 2561 2562 if (!blk_dev_has_tray(blk)) { 2563 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2564 * called at all); therefore, the medium needs to be pushed into the 2565 * slot here. 2566 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2567 * value passed here (i.e. true). */ 2568 blk_dev_change_media_cb(blk, true, &local_err); 2569 if (local_err) { 2570 error_propagate(errp, local_err); 2571 blk_remove_bs(blk); 2572 return; 2573 } 2574 } 2575 } 2576 2577 static void blockdev_insert_medium(bool has_device, const char *device, 2578 bool has_id, const char *id, 2579 const char *node_name, Error **errp) 2580 { 2581 BlockBackend *blk; 2582 BlockDriverState *bs; 2583 2584 blk = qmp_get_blk(has_device ? device : NULL, 2585 has_id ? id : NULL, 2586 errp); 2587 if (!blk) { 2588 return; 2589 } 2590 2591 bs = bdrv_find_node(node_name); 2592 if (!bs) { 2593 error_setg(errp, "Node '%s' not found", node_name); 2594 return; 2595 } 2596 2597 if (bdrv_has_blk(bs)) { 2598 error_setg(errp, "Node '%s' is already in use", node_name); 2599 return; 2600 } 2601 2602 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2603 } 2604 2605 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2606 Error **errp) 2607 { 2608 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2609 } 2610 2611 void qmp_blockdev_change_medium(bool has_device, const char *device, 2612 bool has_id, const char *id, 2613 const char *filename, 2614 bool has_format, const char *format, 2615 bool has_read_only, 2616 BlockdevChangeReadOnlyMode read_only, 2617 Error **errp) 2618 { 2619 BlockBackend *blk; 2620 BlockDriverState *medium_bs = NULL; 2621 int bdrv_flags; 2622 bool detect_zeroes; 2623 int rc; 2624 QDict *options = NULL; 2625 Error *err = NULL; 2626 2627 blk = qmp_get_blk(has_device ? device : NULL, 2628 has_id ? id : NULL, 2629 errp); 2630 if (!blk) { 2631 goto fail; 2632 } 2633 2634 if (blk_bs(blk)) { 2635 blk_update_root_state(blk); 2636 } 2637 2638 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2639 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2640 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2641 2642 if (!has_read_only) { 2643 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2644 } 2645 2646 switch (read_only) { 2647 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2648 break; 2649 2650 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2651 bdrv_flags &= ~BDRV_O_RDWR; 2652 break; 2653 2654 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2655 bdrv_flags |= BDRV_O_RDWR; 2656 break; 2657 2658 default: 2659 abort(); 2660 } 2661 2662 options = qdict_new(); 2663 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2664 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2665 2666 if (has_format) { 2667 qdict_put_str(options, "driver", format); 2668 } 2669 2670 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2671 if (!medium_bs) { 2672 goto fail; 2673 } 2674 2675 rc = do_open_tray(has_device ? device : NULL, 2676 has_id ? id : NULL, 2677 false, &err); 2678 if (rc && rc != -ENOSYS) { 2679 error_propagate(errp, err); 2680 goto fail; 2681 } 2682 error_free(err); 2683 err = NULL; 2684 2685 blockdev_remove_medium(has_device, device, has_id, id, &err); 2686 if (err) { 2687 error_propagate(errp, err); 2688 goto fail; 2689 } 2690 2691 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2692 if (err) { 2693 error_propagate(errp, err); 2694 goto fail; 2695 } 2696 2697 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2698 2699 fail: 2700 /* If the medium has been inserted, the device has its own reference, so 2701 * ours must be relinquished; and if it has not been inserted successfully, 2702 * the reference must be relinquished anyway */ 2703 bdrv_unref(medium_bs); 2704 } 2705 2706 /* throttling disk I/O limits */ 2707 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2708 { 2709 ThrottleConfig cfg; 2710 BlockDriverState *bs; 2711 BlockBackend *blk; 2712 AioContext *aio_context; 2713 2714 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2715 arg->has_id ? arg->id : NULL, 2716 errp); 2717 if (!blk) { 2718 return; 2719 } 2720 2721 aio_context = blk_get_aio_context(blk); 2722 aio_context_acquire(aio_context); 2723 2724 bs = blk_bs(blk); 2725 if (!bs) { 2726 error_setg(errp, "Device has no medium"); 2727 goto out; 2728 } 2729 2730 throttle_config_init(&cfg); 2731 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2732 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2733 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2734 2735 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2736 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2737 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2738 2739 if (arg->has_bps_max) { 2740 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2741 } 2742 if (arg->has_bps_rd_max) { 2743 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2744 } 2745 if (arg->has_bps_wr_max) { 2746 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2747 } 2748 if (arg->has_iops_max) { 2749 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2750 } 2751 if (arg->has_iops_rd_max) { 2752 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2753 } 2754 if (arg->has_iops_wr_max) { 2755 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2756 } 2757 2758 if (arg->has_bps_max_length) { 2759 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2760 } 2761 if (arg->has_bps_rd_max_length) { 2762 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2763 } 2764 if (arg->has_bps_wr_max_length) { 2765 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2766 } 2767 if (arg->has_iops_max_length) { 2768 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2769 } 2770 if (arg->has_iops_rd_max_length) { 2771 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2772 } 2773 if (arg->has_iops_wr_max_length) { 2774 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2775 } 2776 2777 if (arg->has_iops_size) { 2778 cfg.op_size = arg->iops_size; 2779 } 2780 2781 if (!throttle_is_valid(&cfg, errp)) { 2782 goto out; 2783 } 2784 2785 if (throttle_enabled(&cfg)) { 2786 /* Enable I/O limits if they're not enabled yet, otherwise 2787 * just update the throttling group. */ 2788 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2789 blk_io_limits_enable(blk, 2790 arg->has_group ? arg->group : 2791 arg->has_device ? arg->device : 2792 arg->id); 2793 } else if (arg->has_group) { 2794 blk_io_limits_update_group(blk, arg->group); 2795 } 2796 /* Set the new throttling configuration */ 2797 blk_set_io_limits(blk, &cfg); 2798 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2799 /* If all throttling settings are set to 0, disable I/O limits */ 2800 blk_io_limits_disable(blk); 2801 } 2802 2803 out: 2804 aio_context_release(aio_context); 2805 } 2806 2807 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2808 bool has_granularity, uint32_t granularity, 2809 bool has_persistent, bool persistent, 2810 bool has_autoload, bool autoload, 2811 bool has_disabled, bool disabled, 2812 Error **errp) 2813 { 2814 BlockDriverState *bs; 2815 BdrvDirtyBitmap *bitmap; 2816 AioContext *aio_context = NULL; 2817 2818 if (!name || name[0] == '\0') { 2819 error_setg(errp, "Bitmap name cannot be empty"); 2820 return; 2821 } 2822 2823 bs = bdrv_lookup_bs(node, node, errp); 2824 if (!bs) { 2825 return; 2826 } 2827 2828 if (has_granularity) { 2829 if (granularity < 512 || !is_power_of_2(granularity)) { 2830 error_setg(errp, "Granularity must be power of 2 " 2831 "and at least 512"); 2832 return; 2833 } 2834 } else { 2835 /* Default to cluster size, if available: */ 2836 granularity = bdrv_get_default_bitmap_granularity(bs); 2837 } 2838 2839 if (!has_persistent) { 2840 persistent = false; 2841 } 2842 2843 if (has_autoload) { 2844 warn_report("Autoload option is deprecated and its value is ignored"); 2845 } 2846 2847 if (!has_disabled) { 2848 disabled = false; 2849 } 2850 2851 if (persistent) { 2852 aio_context = bdrv_get_aio_context(bs); 2853 aio_context_acquire(aio_context); 2854 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2855 goto out; 2856 } 2857 } 2858 2859 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2860 if (bitmap == NULL) { 2861 goto out; 2862 } 2863 2864 if (disabled) { 2865 bdrv_disable_dirty_bitmap(bitmap); 2866 } 2867 2868 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2869 out: 2870 if (aio_context) { 2871 aio_context_release(aio_context); 2872 } 2873 } 2874 2875 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2876 Error **errp) 2877 { 2878 BlockDriverState *bs; 2879 BdrvDirtyBitmap *bitmap; 2880 Error *local_err = NULL; 2881 AioContext *aio_context = NULL; 2882 2883 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2884 if (!bitmap || !bs) { 2885 return; 2886 } 2887 2888 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2889 errp)) { 2890 return; 2891 } 2892 2893 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2894 aio_context = bdrv_get_aio_context(bs); 2895 aio_context_acquire(aio_context); 2896 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2897 if (local_err != NULL) { 2898 error_propagate(errp, local_err); 2899 goto out; 2900 } 2901 } 2902 2903 bdrv_release_dirty_bitmap(bs, bitmap); 2904 out: 2905 if (aio_context) { 2906 aio_context_release(aio_context); 2907 } 2908 } 2909 2910 /** 2911 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2912 * immediately after a full backup operation. 2913 */ 2914 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2915 Error **errp) 2916 { 2917 BdrvDirtyBitmap *bitmap; 2918 BlockDriverState *bs; 2919 2920 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2921 if (!bitmap || !bs) { 2922 return; 2923 } 2924 2925 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2926 return; 2927 } 2928 2929 bdrv_clear_dirty_bitmap(bitmap, NULL); 2930 } 2931 2932 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2933 Error **errp) 2934 { 2935 BlockDriverState *bs; 2936 BdrvDirtyBitmap *bitmap; 2937 2938 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2939 if (!bitmap) { 2940 return; 2941 } 2942 2943 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2944 return; 2945 } 2946 2947 bdrv_enable_dirty_bitmap(bitmap); 2948 } 2949 2950 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2951 Error **errp) 2952 { 2953 BlockDriverState *bs; 2954 BdrvDirtyBitmap *bitmap; 2955 2956 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2957 if (!bitmap) { 2958 return; 2959 } 2960 2961 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2962 return; 2963 } 2964 2965 bdrv_disable_dirty_bitmap(bitmap); 2966 } 2967 2968 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2969 const char *node, const char *target, 2970 BlockDirtyBitmapMergeSourceList *bitmaps, 2971 HBitmap **backup, Error **errp) 2972 { 2973 BlockDriverState *bs; 2974 BdrvDirtyBitmap *dst, *src, *anon; 2975 BlockDirtyBitmapMergeSourceList *lst; 2976 Error *local_err = NULL; 2977 2978 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 2979 if (!dst) { 2980 return NULL; 2981 } 2982 2983 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 2984 NULL, errp); 2985 if (!anon) { 2986 return NULL; 2987 } 2988 2989 for (lst = bitmaps; lst; lst = lst->next) { 2990 switch (lst->value->type) { 2991 const char *name, *node; 2992 case QTYPE_QSTRING: 2993 name = lst->value->u.local; 2994 src = bdrv_find_dirty_bitmap(bs, name); 2995 if (!src) { 2996 error_setg(errp, "Dirty bitmap '%s' not found", name); 2997 dst = NULL; 2998 goto out; 2999 } 3000 break; 3001 case QTYPE_QDICT: 3002 node = lst->value->u.external.node; 3003 name = lst->value->u.external.name; 3004 src = block_dirty_bitmap_lookup(node, name, NULL, errp); 3005 if (!src) { 3006 dst = NULL; 3007 goto out; 3008 } 3009 break; 3010 default: 3011 abort(); 3012 } 3013 3014 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 3015 if (local_err) { 3016 error_propagate(errp, local_err); 3017 dst = NULL; 3018 goto out; 3019 } 3020 } 3021 3022 /* Merge into dst; dst is unchanged on failure. */ 3023 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3024 3025 out: 3026 bdrv_release_dirty_bitmap(bs, anon); 3027 return dst; 3028 } 3029 3030 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3031 BlockDirtyBitmapMergeSourceList *bitmaps, 3032 Error **errp) 3033 { 3034 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3035 } 3036 3037 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3038 const char *name, 3039 Error **errp) 3040 { 3041 BdrvDirtyBitmap *bitmap; 3042 BlockDriverState *bs; 3043 BlockDirtyBitmapSha256 *ret = NULL; 3044 char *sha256; 3045 3046 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3047 if (!bitmap || !bs) { 3048 return NULL; 3049 } 3050 3051 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3052 if (sha256 == NULL) { 3053 return NULL; 3054 } 3055 3056 ret = g_new(BlockDirtyBitmapSha256, 1); 3057 ret->sha256 = sha256; 3058 3059 return ret; 3060 } 3061 3062 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3063 { 3064 const char *id = qdict_get_str(qdict, "id"); 3065 BlockBackend *blk; 3066 BlockDriverState *bs; 3067 AioContext *aio_context; 3068 Error *local_err = NULL; 3069 3070 bs = bdrv_find_node(id); 3071 if (bs) { 3072 qmp_blockdev_del(id, &local_err); 3073 if (local_err) { 3074 error_report_err(local_err); 3075 } 3076 return; 3077 } 3078 3079 blk = blk_by_name(id); 3080 if (!blk) { 3081 error_report("Device '%s' not found", id); 3082 return; 3083 } 3084 3085 if (!blk_legacy_dinfo(blk)) { 3086 error_report("Deleting device added with blockdev-add" 3087 " is not supported"); 3088 return; 3089 } 3090 3091 aio_context = blk_get_aio_context(blk); 3092 aio_context_acquire(aio_context); 3093 3094 bs = blk_bs(blk); 3095 if (bs) { 3096 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3097 error_report_err(local_err); 3098 aio_context_release(aio_context); 3099 return; 3100 } 3101 3102 blk_remove_bs(blk); 3103 } 3104 3105 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3106 monitor_remove_blk(blk); 3107 3108 /* If this BlockBackend has a device attached to it, its refcount will be 3109 * decremented when the device is removed; otherwise we have to do so here. 3110 */ 3111 if (blk_get_attached_dev(blk)) { 3112 /* Further I/O must not pause the guest */ 3113 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3114 BLOCKDEV_ON_ERROR_REPORT); 3115 } else { 3116 blk_unref(blk); 3117 } 3118 3119 aio_context_release(aio_context); 3120 } 3121 3122 void qmp_block_resize(bool has_device, const char *device, 3123 bool has_node_name, const char *node_name, 3124 int64_t size, Error **errp) 3125 { 3126 Error *local_err = NULL; 3127 BlockBackend *blk = NULL; 3128 BlockDriverState *bs; 3129 AioContext *aio_context; 3130 int ret; 3131 3132 bs = bdrv_lookup_bs(has_device ? device : NULL, 3133 has_node_name ? node_name : NULL, 3134 &local_err); 3135 if (local_err) { 3136 error_propagate(errp, local_err); 3137 return; 3138 } 3139 3140 aio_context = bdrv_get_aio_context(bs); 3141 aio_context_acquire(aio_context); 3142 3143 if (!bdrv_is_first_non_filter(bs)) { 3144 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3145 goto out; 3146 } 3147 3148 if (size < 0) { 3149 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3150 goto out; 3151 } 3152 3153 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3154 error_setg(errp, QERR_DEVICE_IN_USE, device); 3155 goto out; 3156 } 3157 3158 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL); 3159 ret = blk_insert_bs(blk, bs, errp); 3160 if (ret < 0) { 3161 goto out; 3162 } 3163 3164 bdrv_drained_begin(bs); 3165 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3166 bdrv_drained_end(bs); 3167 3168 out: 3169 blk_unref(blk); 3170 aio_context_release(aio_context); 3171 } 3172 3173 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3174 bool has_base, const char *base, 3175 bool has_base_node, const char *base_node, 3176 bool has_backing_file, const char *backing_file, 3177 bool has_speed, int64_t speed, 3178 bool has_on_error, BlockdevOnError on_error, 3179 bool has_auto_finalize, bool auto_finalize, 3180 bool has_auto_dismiss, bool auto_dismiss, 3181 Error **errp) 3182 { 3183 BlockDriverState *bs, *iter; 3184 BlockDriverState *base_bs = NULL; 3185 AioContext *aio_context; 3186 Error *local_err = NULL; 3187 const char *base_name = NULL; 3188 int job_flags = JOB_DEFAULT; 3189 3190 if (!has_on_error) { 3191 on_error = BLOCKDEV_ON_ERROR_REPORT; 3192 } 3193 3194 bs = bdrv_lookup_bs(device, device, errp); 3195 if (!bs) { 3196 return; 3197 } 3198 3199 aio_context = bdrv_get_aio_context(bs); 3200 aio_context_acquire(aio_context); 3201 3202 if (has_base && has_base_node) { 3203 error_setg(errp, "'base' and 'base-node' cannot be specified " 3204 "at the same time"); 3205 goto out; 3206 } 3207 3208 if (has_base) { 3209 base_bs = bdrv_find_backing_image(bs, base); 3210 if (base_bs == NULL) { 3211 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3212 goto out; 3213 } 3214 assert(bdrv_get_aio_context(base_bs) == aio_context); 3215 base_name = base; 3216 } 3217 3218 if (has_base_node) { 3219 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3220 if (!base_bs) { 3221 goto out; 3222 } 3223 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3224 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3225 base_node, device); 3226 goto out; 3227 } 3228 assert(bdrv_get_aio_context(base_bs) == aio_context); 3229 bdrv_refresh_filename(base_bs); 3230 base_name = base_bs->filename; 3231 } 3232 3233 /* Check for op blockers in the whole chain between bs and base */ 3234 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3235 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3236 goto out; 3237 } 3238 } 3239 3240 /* if we are streaming the entire chain, the result will have no backing 3241 * file, and specifying one is therefore an error */ 3242 if (base_bs == NULL && has_backing_file) { 3243 error_setg(errp, "backing file specified, but streaming the " 3244 "entire chain"); 3245 goto out; 3246 } 3247 3248 /* backing_file string overrides base bs filename */ 3249 base_name = has_backing_file ? backing_file : base_name; 3250 3251 if (has_auto_finalize && !auto_finalize) { 3252 job_flags |= JOB_MANUAL_FINALIZE; 3253 } 3254 if (has_auto_dismiss && !auto_dismiss) { 3255 job_flags |= JOB_MANUAL_DISMISS; 3256 } 3257 3258 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3259 job_flags, has_speed ? speed : 0, on_error, &local_err); 3260 if (local_err) { 3261 error_propagate(errp, local_err); 3262 goto out; 3263 } 3264 3265 trace_qmp_block_stream(bs); 3266 3267 out: 3268 aio_context_release(aio_context); 3269 } 3270 3271 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3272 bool has_base_node, const char *base_node, 3273 bool has_base, const char *base, 3274 bool has_top_node, const char *top_node, 3275 bool has_top, const char *top, 3276 bool has_backing_file, const char *backing_file, 3277 bool has_speed, int64_t speed, 3278 bool has_filter_node_name, const char *filter_node_name, 3279 bool has_auto_finalize, bool auto_finalize, 3280 bool has_auto_dismiss, bool auto_dismiss, 3281 Error **errp) 3282 { 3283 BlockDriverState *bs; 3284 BlockDriverState *iter; 3285 BlockDriverState *base_bs, *top_bs; 3286 AioContext *aio_context; 3287 Error *local_err = NULL; 3288 /* This will be part of the QMP command, if/when the 3289 * BlockdevOnError change for blkmirror makes it in 3290 */ 3291 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3292 int job_flags = JOB_DEFAULT; 3293 3294 if (!has_speed) { 3295 speed = 0; 3296 } 3297 if (!has_filter_node_name) { 3298 filter_node_name = NULL; 3299 } 3300 if (has_auto_finalize && !auto_finalize) { 3301 job_flags |= JOB_MANUAL_FINALIZE; 3302 } 3303 if (has_auto_dismiss && !auto_dismiss) { 3304 job_flags |= JOB_MANUAL_DISMISS; 3305 } 3306 3307 /* Important Note: 3308 * libvirt relies on the DeviceNotFound error class in order to probe for 3309 * live commit feature versions; for this to work, we must make sure to 3310 * perform the device lookup before any generic errors that may occur in a 3311 * scenario in which all optional arguments are omitted. */ 3312 bs = qmp_get_root_bs(device, &local_err); 3313 if (!bs) { 3314 bs = bdrv_lookup_bs(device, device, NULL); 3315 if (!bs) { 3316 error_free(local_err); 3317 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3318 "Device '%s' not found", device); 3319 } else { 3320 error_propagate(errp, local_err); 3321 } 3322 return; 3323 } 3324 3325 aio_context = bdrv_get_aio_context(bs); 3326 aio_context_acquire(aio_context); 3327 3328 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3329 goto out; 3330 } 3331 3332 /* default top_bs is the active layer */ 3333 top_bs = bs; 3334 3335 if (has_top_node && has_top) { 3336 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3337 goto out; 3338 } else if (has_top_node) { 3339 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3340 if (top_bs == NULL) { 3341 goto out; 3342 } 3343 if (!bdrv_chain_contains(bs, top_bs)) { 3344 error_setg(errp, "'%s' is not in this backing file chain", 3345 top_node); 3346 goto out; 3347 } 3348 } else if (has_top && top) { 3349 /* This strcmp() is just a shortcut, there is no need to 3350 * refresh @bs's filename. If it mismatches, 3351 * bdrv_find_backing_image() will do the refresh and may still 3352 * return @bs. */ 3353 if (strcmp(bs->filename, top) != 0) { 3354 top_bs = bdrv_find_backing_image(bs, top); 3355 } 3356 } 3357 3358 if (top_bs == NULL) { 3359 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3360 goto out; 3361 } 3362 3363 assert(bdrv_get_aio_context(top_bs) == aio_context); 3364 3365 if (has_base_node && has_base) { 3366 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3367 goto out; 3368 } else if (has_base_node) { 3369 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3370 if (base_bs == NULL) { 3371 goto out; 3372 } 3373 if (!bdrv_chain_contains(top_bs, base_bs)) { 3374 error_setg(errp, "'%s' is not in this backing file chain", 3375 base_node); 3376 goto out; 3377 } 3378 } else if (has_base && base) { 3379 base_bs = bdrv_find_backing_image(top_bs, base); 3380 } else { 3381 base_bs = bdrv_find_base(top_bs); 3382 } 3383 3384 if (base_bs == NULL) { 3385 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3386 goto out; 3387 } 3388 3389 assert(bdrv_get_aio_context(base_bs) == aio_context); 3390 3391 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3392 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3393 goto out; 3394 } 3395 } 3396 3397 /* Do not allow attempts to commit an image into itself */ 3398 if (top_bs == base_bs) { 3399 error_setg(errp, "cannot commit an image into itself"); 3400 goto out; 3401 } 3402 3403 if (top_bs == bs) { 3404 if (has_backing_file) { 3405 error_setg(errp, "'backing-file' specified," 3406 " but 'top' is the active layer"); 3407 goto out; 3408 } 3409 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3410 job_flags, speed, on_error, 3411 filter_node_name, NULL, NULL, false, &local_err); 3412 } else { 3413 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3414 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3415 goto out; 3416 } 3417 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3418 speed, on_error, has_backing_file ? backing_file : NULL, 3419 filter_node_name, &local_err); 3420 } 3421 if (local_err != NULL) { 3422 error_propagate(errp, local_err); 3423 goto out; 3424 } 3425 3426 out: 3427 aio_context_release(aio_context); 3428 } 3429 3430 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3431 Error **errp) 3432 { 3433 BlockDriverState *bs; 3434 BlockDriverState *target_bs; 3435 BlockDriverState *source = NULL; 3436 BlockJob *job = NULL; 3437 BdrvDirtyBitmap *bmap = NULL; 3438 AioContext *aio_context; 3439 QDict *options = NULL; 3440 Error *local_err = NULL; 3441 int flags, job_flags = JOB_DEFAULT; 3442 int64_t size; 3443 bool set_backing_hd = false; 3444 int ret; 3445 3446 if (!backup->has_speed) { 3447 backup->speed = 0; 3448 } 3449 if (!backup->has_on_source_error) { 3450 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3451 } 3452 if (!backup->has_on_target_error) { 3453 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3454 } 3455 if (!backup->has_mode) { 3456 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3457 } 3458 if (!backup->has_job_id) { 3459 backup->job_id = NULL; 3460 } 3461 if (!backup->has_auto_finalize) { 3462 backup->auto_finalize = true; 3463 } 3464 if (!backup->has_auto_dismiss) { 3465 backup->auto_dismiss = true; 3466 } 3467 if (!backup->has_compress) { 3468 backup->compress = false; 3469 } 3470 3471 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3472 if (!bs) { 3473 return NULL; 3474 } 3475 3476 if (!bs->drv) { 3477 error_setg(errp, "Device has no medium"); 3478 return NULL; 3479 } 3480 3481 aio_context = bdrv_get_aio_context(bs); 3482 aio_context_acquire(aio_context); 3483 3484 if (!backup->has_format) { 3485 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3486 NULL : (char*) bs->drv->format_name; 3487 } 3488 3489 /* Early check to avoid creating target */ 3490 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3491 goto out; 3492 } 3493 3494 flags = bs->open_flags | BDRV_O_RDWR; 3495 3496 /* See if we have a backing HD we can use to create our new image 3497 * on top of. */ 3498 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3499 source = backing_bs(bs); 3500 if (!source) { 3501 backup->sync = MIRROR_SYNC_MODE_FULL; 3502 } 3503 } 3504 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3505 source = bs; 3506 flags |= BDRV_O_NO_BACKING; 3507 set_backing_hd = true; 3508 } 3509 3510 size = bdrv_getlength(bs); 3511 if (size < 0) { 3512 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3513 goto out; 3514 } 3515 3516 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3517 assert(backup->format); 3518 if (source) { 3519 bdrv_refresh_filename(source); 3520 bdrv_img_create(backup->target, backup->format, source->filename, 3521 source->drv->format_name, NULL, 3522 size, flags, false, &local_err); 3523 } else { 3524 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3525 size, flags, false, &local_err); 3526 } 3527 } 3528 3529 if (local_err) { 3530 error_propagate(errp, local_err); 3531 goto out; 3532 } 3533 3534 if (backup->format) { 3535 if (!options) { 3536 options = qdict_new(); 3537 } 3538 qdict_put_str(options, "driver", backup->format); 3539 } 3540 3541 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3542 if (!target_bs) { 3543 goto out; 3544 } 3545 3546 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3547 if (ret < 0) { 3548 bdrv_unref(target_bs); 3549 goto out; 3550 } 3551 3552 if (set_backing_hd) { 3553 bdrv_set_backing_hd(target_bs, source, &local_err); 3554 if (local_err) { 3555 goto unref; 3556 } 3557 } 3558 3559 if (backup->has_bitmap) { 3560 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3561 if (!bmap) { 3562 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3563 goto unref; 3564 } 3565 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3566 goto unref; 3567 } 3568 } 3569 if (!backup->auto_finalize) { 3570 job_flags |= JOB_MANUAL_FINALIZE; 3571 } 3572 if (!backup->auto_dismiss) { 3573 job_flags |= JOB_MANUAL_DISMISS; 3574 } 3575 3576 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3577 backup->sync, bmap, backup->compress, 3578 backup->on_source_error, backup->on_target_error, 3579 job_flags, NULL, NULL, txn, &local_err); 3580 if (local_err != NULL) { 3581 error_propagate(errp, local_err); 3582 goto unref; 3583 } 3584 3585 unref: 3586 bdrv_unref(target_bs); 3587 out: 3588 aio_context_release(aio_context); 3589 return job; 3590 } 3591 3592 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3593 { 3594 3595 BlockJob *job; 3596 job = do_drive_backup(arg, NULL, errp); 3597 if (job) { 3598 job_start(&job->job); 3599 } 3600 } 3601 3602 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3603 { 3604 return bdrv_named_nodes_list(errp); 3605 } 3606 3607 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3608 { 3609 return bdrv_get_xdbg_block_graph(errp); 3610 } 3611 3612 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3613 Error **errp) 3614 { 3615 BlockDriverState *bs; 3616 BlockDriverState *target_bs; 3617 Error *local_err = NULL; 3618 BdrvDirtyBitmap *bmap = NULL; 3619 AioContext *aio_context; 3620 BlockJob *job = NULL; 3621 int job_flags = JOB_DEFAULT; 3622 int ret; 3623 3624 if (!backup->has_speed) { 3625 backup->speed = 0; 3626 } 3627 if (!backup->has_on_source_error) { 3628 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3629 } 3630 if (!backup->has_on_target_error) { 3631 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3632 } 3633 if (!backup->has_job_id) { 3634 backup->job_id = NULL; 3635 } 3636 if (!backup->has_auto_finalize) { 3637 backup->auto_finalize = true; 3638 } 3639 if (!backup->has_auto_dismiss) { 3640 backup->auto_dismiss = true; 3641 } 3642 if (!backup->has_compress) { 3643 backup->compress = false; 3644 } 3645 3646 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3647 if (!bs) { 3648 return NULL; 3649 } 3650 3651 aio_context = bdrv_get_aio_context(bs); 3652 aio_context_acquire(aio_context); 3653 3654 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3655 if (!target_bs) { 3656 goto out; 3657 } 3658 3659 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3660 if (ret < 0) { 3661 goto out; 3662 } 3663 3664 if (backup->has_bitmap) { 3665 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3666 if (!bmap) { 3667 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3668 goto out; 3669 } 3670 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3671 goto out; 3672 } 3673 } 3674 3675 if (!backup->auto_finalize) { 3676 job_flags |= JOB_MANUAL_FINALIZE; 3677 } 3678 if (!backup->auto_dismiss) { 3679 job_flags |= JOB_MANUAL_DISMISS; 3680 } 3681 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3682 backup->sync, bmap, backup->compress, 3683 backup->on_source_error, backup->on_target_error, 3684 job_flags, NULL, NULL, txn, &local_err); 3685 if (local_err != NULL) { 3686 error_propagate(errp, local_err); 3687 } 3688 out: 3689 aio_context_release(aio_context); 3690 return job; 3691 } 3692 3693 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3694 { 3695 BlockJob *job; 3696 job = do_blockdev_backup(arg, NULL, errp); 3697 if (job) { 3698 job_start(&job->job); 3699 } 3700 } 3701 3702 /* Parameter check and block job starting for drive mirroring. 3703 * Caller should hold @device and @target's aio context (must be the same). 3704 **/ 3705 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3706 BlockDriverState *target, 3707 bool has_replaces, const char *replaces, 3708 enum MirrorSyncMode sync, 3709 BlockMirrorBackingMode backing_mode, 3710 bool has_speed, int64_t speed, 3711 bool has_granularity, uint32_t granularity, 3712 bool has_buf_size, int64_t buf_size, 3713 bool has_on_source_error, 3714 BlockdevOnError on_source_error, 3715 bool has_on_target_error, 3716 BlockdevOnError on_target_error, 3717 bool has_unmap, bool unmap, 3718 bool has_filter_node_name, 3719 const char *filter_node_name, 3720 bool has_copy_mode, MirrorCopyMode copy_mode, 3721 bool has_auto_finalize, bool auto_finalize, 3722 bool has_auto_dismiss, bool auto_dismiss, 3723 Error **errp) 3724 { 3725 int job_flags = JOB_DEFAULT; 3726 3727 if (!has_speed) { 3728 speed = 0; 3729 } 3730 if (!has_on_source_error) { 3731 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3732 } 3733 if (!has_on_target_error) { 3734 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3735 } 3736 if (!has_granularity) { 3737 granularity = 0; 3738 } 3739 if (!has_buf_size) { 3740 buf_size = 0; 3741 } 3742 if (!has_unmap) { 3743 unmap = true; 3744 } 3745 if (!has_filter_node_name) { 3746 filter_node_name = NULL; 3747 } 3748 if (!has_copy_mode) { 3749 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3750 } 3751 if (has_auto_finalize && !auto_finalize) { 3752 job_flags |= JOB_MANUAL_FINALIZE; 3753 } 3754 if (has_auto_dismiss && !auto_dismiss) { 3755 job_flags |= JOB_MANUAL_DISMISS; 3756 } 3757 3758 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3759 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3760 "a value in range [512B, 64MB]"); 3761 return; 3762 } 3763 if (granularity & (granularity - 1)) { 3764 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3765 "power of 2"); 3766 return; 3767 } 3768 3769 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3770 return; 3771 } 3772 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3773 return; 3774 } 3775 3776 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3777 sync = MIRROR_SYNC_MODE_FULL; 3778 } 3779 3780 if (has_replaces) { 3781 BlockDriverState *to_replace_bs; 3782 AioContext *replace_aio_context; 3783 int64_t bs_size, replace_size; 3784 3785 bs_size = bdrv_getlength(bs); 3786 if (bs_size < 0) { 3787 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3788 return; 3789 } 3790 3791 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3792 if (!to_replace_bs) { 3793 return; 3794 } 3795 3796 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3797 aio_context_acquire(replace_aio_context); 3798 replace_size = bdrv_getlength(to_replace_bs); 3799 aio_context_release(replace_aio_context); 3800 3801 if (replace_size < 0) { 3802 error_setg_errno(errp, -replace_size, 3803 "Failed to query the replacement node's size"); 3804 return; 3805 } 3806 if (bs_size != replace_size) { 3807 error_setg(errp, "cannot replace image with a mirror image of " 3808 "different size"); 3809 return; 3810 } 3811 } 3812 3813 /* pass the node name to replace to mirror start since it's loose coupling 3814 * and will allow to check whether the node still exist at mirror completion 3815 */ 3816 mirror_start(job_id, bs, target, 3817 has_replaces ? replaces : NULL, job_flags, 3818 speed, granularity, buf_size, sync, backing_mode, 3819 on_source_error, on_target_error, unmap, filter_node_name, 3820 copy_mode, errp); 3821 } 3822 3823 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3824 { 3825 BlockDriverState *bs; 3826 BlockDriverState *source, *target_bs; 3827 AioContext *aio_context; 3828 BlockMirrorBackingMode backing_mode; 3829 Error *local_err = NULL; 3830 QDict *options = NULL; 3831 int flags; 3832 int64_t size; 3833 const char *format = arg->format; 3834 int ret; 3835 3836 bs = qmp_get_root_bs(arg->device, errp); 3837 if (!bs) { 3838 return; 3839 } 3840 3841 /* Early check to avoid creating target */ 3842 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3843 return; 3844 } 3845 3846 aio_context = bdrv_get_aio_context(bs); 3847 aio_context_acquire(aio_context); 3848 3849 if (!arg->has_mode) { 3850 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3851 } 3852 3853 if (!arg->has_format) { 3854 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3855 ? NULL : bs->drv->format_name); 3856 } 3857 3858 flags = bs->open_flags | BDRV_O_RDWR; 3859 source = backing_bs(bs); 3860 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3861 arg->sync = MIRROR_SYNC_MODE_FULL; 3862 } 3863 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3864 source = bs; 3865 } 3866 3867 size = bdrv_getlength(bs); 3868 if (size < 0) { 3869 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3870 goto out; 3871 } 3872 3873 if (arg->has_replaces) { 3874 if (!arg->has_node_name) { 3875 error_setg(errp, "a node-name must be provided when replacing a" 3876 " named node of the graph"); 3877 goto out; 3878 } 3879 } 3880 3881 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3882 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3883 } else { 3884 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3885 } 3886 3887 /* Don't open backing image in create() */ 3888 flags |= BDRV_O_NO_BACKING; 3889 3890 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3891 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3892 { 3893 /* create new image w/o backing file */ 3894 assert(format); 3895 bdrv_img_create(arg->target, format, 3896 NULL, NULL, NULL, size, flags, false, &local_err); 3897 } else { 3898 switch (arg->mode) { 3899 case NEW_IMAGE_MODE_EXISTING: 3900 break; 3901 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3902 /* create new image with backing file */ 3903 bdrv_refresh_filename(source); 3904 bdrv_img_create(arg->target, format, 3905 source->filename, 3906 source->drv->format_name, 3907 NULL, size, flags, false, &local_err); 3908 break; 3909 default: 3910 abort(); 3911 } 3912 } 3913 3914 if (local_err) { 3915 error_propagate(errp, local_err); 3916 goto out; 3917 } 3918 3919 options = qdict_new(); 3920 if (arg->has_node_name) { 3921 qdict_put_str(options, "node-name", arg->node_name); 3922 } 3923 if (format) { 3924 qdict_put_str(options, "driver", format); 3925 } 3926 3927 /* Mirroring takes care of copy-on-write using the source's backing 3928 * file. 3929 */ 3930 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3931 if (!target_bs) { 3932 goto out; 3933 } 3934 3935 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3936 if (ret < 0) { 3937 bdrv_unref(target_bs); 3938 goto out; 3939 } 3940 3941 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3942 arg->has_replaces, arg->replaces, arg->sync, 3943 backing_mode, arg->has_speed, arg->speed, 3944 arg->has_granularity, arg->granularity, 3945 arg->has_buf_size, arg->buf_size, 3946 arg->has_on_source_error, arg->on_source_error, 3947 arg->has_on_target_error, arg->on_target_error, 3948 arg->has_unmap, arg->unmap, 3949 false, NULL, 3950 arg->has_copy_mode, arg->copy_mode, 3951 arg->has_auto_finalize, arg->auto_finalize, 3952 arg->has_auto_dismiss, arg->auto_dismiss, 3953 &local_err); 3954 bdrv_unref(target_bs); 3955 error_propagate(errp, local_err); 3956 out: 3957 aio_context_release(aio_context); 3958 } 3959 3960 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3961 const char *device, const char *target, 3962 bool has_replaces, const char *replaces, 3963 MirrorSyncMode sync, 3964 bool has_speed, int64_t speed, 3965 bool has_granularity, uint32_t granularity, 3966 bool has_buf_size, int64_t buf_size, 3967 bool has_on_source_error, 3968 BlockdevOnError on_source_error, 3969 bool has_on_target_error, 3970 BlockdevOnError on_target_error, 3971 bool has_filter_node_name, 3972 const char *filter_node_name, 3973 bool has_copy_mode, MirrorCopyMode copy_mode, 3974 bool has_auto_finalize, bool auto_finalize, 3975 bool has_auto_dismiss, bool auto_dismiss, 3976 Error **errp) 3977 { 3978 BlockDriverState *bs; 3979 BlockDriverState *target_bs; 3980 AioContext *aio_context; 3981 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3982 Error *local_err = NULL; 3983 int ret; 3984 3985 bs = qmp_get_root_bs(device, errp); 3986 if (!bs) { 3987 return; 3988 } 3989 3990 target_bs = bdrv_lookup_bs(target, target, errp); 3991 if (!target_bs) { 3992 return; 3993 } 3994 3995 aio_context = bdrv_get_aio_context(bs); 3996 aio_context_acquire(aio_context); 3997 3998 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3999 if (ret < 0) { 4000 goto out; 4001 } 4002 4003 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 4004 has_replaces, replaces, sync, backing_mode, 4005 has_speed, speed, 4006 has_granularity, granularity, 4007 has_buf_size, buf_size, 4008 has_on_source_error, on_source_error, 4009 has_on_target_error, on_target_error, 4010 true, true, 4011 has_filter_node_name, filter_node_name, 4012 has_copy_mode, copy_mode, 4013 has_auto_finalize, auto_finalize, 4014 has_auto_dismiss, auto_dismiss, 4015 &local_err); 4016 error_propagate(errp, local_err); 4017 out: 4018 aio_context_release(aio_context); 4019 } 4020 4021 /* Get a block job using its ID and acquire its AioContext */ 4022 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 4023 Error **errp) 4024 { 4025 BlockJob *job; 4026 4027 assert(id != NULL); 4028 4029 *aio_context = NULL; 4030 4031 job = block_job_get(id); 4032 4033 if (!job) { 4034 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4035 "Block job '%s' not found", id); 4036 return NULL; 4037 } 4038 4039 *aio_context = blk_get_aio_context(job->blk); 4040 aio_context_acquire(*aio_context); 4041 4042 return job; 4043 } 4044 4045 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4046 { 4047 AioContext *aio_context; 4048 BlockJob *job = find_block_job(device, &aio_context, errp); 4049 4050 if (!job) { 4051 return; 4052 } 4053 4054 block_job_set_speed(job, speed, errp); 4055 aio_context_release(aio_context); 4056 } 4057 4058 void qmp_block_job_cancel(const char *device, 4059 bool has_force, bool force, Error **errp) 4060 { 4061 AioContext *aio_context; 4062 BlockJob *job = find_block_job(device, &aio_context, errp); 4063 4064 if (!job) { 4065 return; 4066 } 4067 4068 if (!has_force) { 4069 force = false; 4070 } 4071 4072 if (job_user_paused(&job->job) && !force) { 4073 error_setg(errp, "The block job for device '%s' is currently paused", 4074 device); 4075 goto out; 4076 } 4077 4078 trace_qmp_block_job_cancel(job); 4079 job_user_cancel(&job->job, force, errp); 4080 out: 4081 aio_context_release(aio_context); 4082 } 4083 4084 void qmp_block_job_pause(const char *device, Error **errp) 4085 { 4086 AioContext *aio_context; 4087 BlockJob *job = find_block_job(device, &aio_context, errp); 4088 4089 if (!job) { 4090 return; 4091 } 4092 4093 trace_qmp_block_job_pause(job); 4094 job_user_pause(&job->job, errp); 4095 aio_context_release(aio_context); 4096 } 4097 4098 void qmp_block_job_resume(const char *device, Error **errp) 4099 { 4100 AioContext *aio_context; 4101 BlockJob *job = find_block_job(device, &aio_context, errp); 4102 4103 if (!job) { 4104 return; 4105 } 4106 4107 trace_qmp_block_job_resume(job); 4108 job_user_resume(&job->job, errp); 4109 aio_context_release(aio_context); 4110 } 4111 4112 void qmp_block_job_complete(const char *device, Error **errp) 4113 { 4114 AioContext *aio_context; 4115 BlockJob *job = find_block_job(device, &aio_context, errp); 4116 4117 if (!job) { 4118 return; 4119 } 4120 4121 trace_qmp_block_job_complete(job); 4122 job_complete(&job->job, errp); 4123 aio_context_release(aio_context); 4124 } 4125 4126 void qmp_block_job_finalize(const char *id, Error **errp) 4127 { 4128 AioContext *aio_context; 4129 BlockJob *job = find_block_job(id, &aio_context, errp); 4130 4131 if (!job) { 4132 return; 4133 } 4134 4135 trace_qmp_block_job_finalize(job); 4136 job_finalize(&job->job, errp); 4137 aio_context_release(aio_context); 4138 } 4139 4140 void qmp_block_job_dismiss(const char *id, Error **errp) 4141 { 4142 AioContext *aio_context; 4143 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4144 Job *job; 4145 4146 if (!bjob) { 4147 return; 4148 } 4149 4150 trace_qmp_block_job_dismiss(bjob); 4151 job = &bjob->job; 4152 job_dismiss(&job, errp); 4153 aio_context_release(aio_context); 4154 } 4155 4156 void qmp_change_backing_file(const char *device, 4157 const char *image_node_name, 4158 const char *backing_file, 4159 Error **errp) 4160 { 4161 BlockDriverState *bs = NULL; 4162 AioContext *aio_context; 4163 BlockDriverState *image_bs = NULL; 4164 Error *local_err = NULL; 4165 bool ro; 4166 int ret; 4167 4168 bs = qmp_get_root_bs(device, errp); 4169 if (!bs) { 4170 return; 4171 } 4172 4173 aio_context = bdrv_get_aio_context(bs); 4174 aio_context_acquire(aio_context); 4175 4176 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4177 if (local_err) { 4178 error_propagate(errp, local_err); 4179 goto out; 4180 } 4181 4182 if (!image_bs) { 4183 error_setg(errp, "image file not found"); 4184 goto out; 4185 } 4186 4187 if (bdrv_find_base(image_bs) == image_bs) { 4188 error_setg(errp, "not allowing backing file change on an image " 4189 "without a backing file"); 4190 goto out; 4191 } 4192 4193 /* even though we are not necessarily operating on bs, we need it to 4194 * determine if block ops are currently prohibited on the chain */ 4195 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4196 goto out; 4197 } 4198 4199 /* final sanity check */ 4200 if (!bdrv_chain_contains(bs, image_bs)) { 4201 error_setg(errp, "'%s' and image file are not in the same chain", 4202 device); 4203 goto out; 4204 } 4205 4206 /* if not r/w, reopen to make r/w */ 4207 ro = bdrv_is_read_only(image_bs); 4208 4209 if (ro) { 4210 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4211 goto out; 4212 } 4213 } 4214 4215 ret = bdrv_change_backing_file(image_bs, backing_file, 4216 image_bs->drv ? image_bs->drv->format_name : ""); 4217 4218 if (ret < 0) { 4219 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4220 backing_file); 4221 /* don't exit here, so we can try to restore open flags if 4222 * appropriate */ 4223 } 4224 4225 if (ro) { 4226 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4227 error_propagate(errp, local_err); 4228 } 4229 4230 out: 4231 aio_context_release(aio_context); 4232 } 4233 4234 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4235 { 4236 QemuOpts *opts; 4237 QDict *qdict; 4238 Error *local_err = NULL; 4239 4240 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4241 if (!opts) { 4242 return; 4243 } 4244 4245 qdict = qemu_opts_to_qdict(opts, NULL); 4246 4247 if (!qdict_get_try_str(qdict, "node-name")) { 4248 qobject_unref(qdict); 4249 error_report("'node-name' needs to be specified"); 4250 goto out; 4251 } 4252 4253 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4254 if (!bs) { 4255 error_report_err(local_err); 4256 goto out; 4257 } 4258 4259 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4260 4261 out: 4262 qemu_opts_del(opts); 4263 } 4264 4265 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4266 { 4267 BlockDriverState *bs; 4268 QObject *obj; 4269 Visitor *v = qobject_output_visitor_new(&obj); 4270 QDict *qdict; 4271 Error *local_err = NULL; 4272 4273 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4274 if (local_err) { 4275 error_propagate(errp, local_err); 4276 goto fail; 4277 } 4278 4279 visit_complete(v, &obj); 4280 qdict = qobject_to(QDict, obj); 4281 4282 qdict_flatten(qdict); 4283 4284 if (!qdict_get_try_str(qdict, "node-name")) { 4285 error_setg(errp, "'node-name' must be specified for the root node"); 4286 goto fail; 4287 } 4288 4289 bs = bds_tree_init(qdict, errp); 4290 if (!bs) { 4291 goto fail; 4292 } 4293 4294 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4295 4296 fail: 4297 visit_free(v); 4298 } 4299 4300 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4301 { 4302 BlockDriverState *bs; 4303 AioContext *ctx; 4304 QObject *obj; 4305 Visitor *v = qobject_output_visitor_new(&obj); 4306 Error *local_err = NULL; 4307 BlockReopenQueue *queue; 4308 QDict *qdict; 4309 4310 /* Check for the selected node name */ 4311 if (!options->has_node_name) { 4312 error_setg(errp, "Node name not specified"); 4313 goto fail; 4314 } 4315 4316 bs = bdrv_find_node(options->node_name); 4317 if (!bs) { 4318 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4319 goto fail; 4320 } 4321 4322 /* Put all options in a QDict and flatten it */ 4323 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4324 if (local_err) { 4325 error_propagate(errp, local_err); 4326 goto fail; 4327 } 4328 4329 visit_complete(v, &obj); 4330 qdict = qobject_to(QDict, obj); 4331 4332 qdict_flatten(qdict); 4333 4334 /* Perform the reopen operation */ 4335 ctx = bdrv_get_aio_context(bs); 4336 aio_context_acquire(ctx); 4337 bdrv_subtree_drained_begin(bs); 4338 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4339 bdrv_reopen_multiple(queue, errp); 4340 bdrv_subtree_drained_end(bs); 4341 aio_context_release(ctx); 4342 4343 fail: 4344 visit_free(v); 4345 } 4346 4347 void qmp_blockdev_del(const char *node_name, Error **errp) 4348 { 4349 AioContext *aio_context; 4350 BlockDriverState *bs; 4351 4352 bs = bdrv_find_node(node_name); 4353 if (!bs) { 4354 error_setg(errp, "Cannot find node %s", node_name); 4355 return; 4356 } 4357 if (bdrv_has_blk(bs)) { 4358 error_setg(errp, "Node %s is in use", node_name); 4359 return; 4360 } 4361 aio_context = bdrv_get_aio_context(bs); 4362 aio_context_acquire(aio_context); 4363 4364 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4365 goto out; 4366 } 4367 4368 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4369 error_setg(errp, "Node %s is not owned by the monitor", 4370 bs->node_name); 4371 goto out; 4372 } 4373 4374 if (bs->refcnt > 1) { 4375 error_setg(errp, "Block device %s is in use", 4376 bdrv_get_device_or_node_name(bs)); 4377 goto out; 4378 } 4379 4380 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4381 bdrv_unref(bs); 4382 4383 out: 4384 aio_context_release(aio_context); 4385 } 4386 4387 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4388 const char *child_name) 4389 { 4390 BdrvChild *child; 4391 4392 QLIST_FOREACH(child, &parent_bs->children, next) { 4393 if (strcmp(child->name, child_name) == 0) { 4394 return child; 4395 } 4396 } 4397 4398 return NULL; 4399 } 4400 4401 void qmp_x_blockdev_change(const char *parent, bool has_child, 4402 const char *child, bool has_node, 4403 const char *node, Error **errp) 4404 { 4405 BlockDriverState *parent_bs, *new_bs = NULL; 4406 BdrvChild *p_child; 4407 4408 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4409 if (!parent_bs) { 4410 return; 4411 } 4412 4413 if (has_child == has_node) { 4414 if (has_child) { 4415 error_setg(errp, "The parameters child and node are in conflict"); 4416 } else { 4417 error_setg(errp, "Either child or node must be specified"); 4418 } 4419 return; 4420 } 4421 4422 if (has_child) { 4423 p_child = bdrv_find_child(parent_bs, child); 4424 if (!p_child) { 4425 error_setg(errp, "Node '%s' does not have child '%s'", 4426 parent, child); 4427 return; 4428 } 4429 bdrv_del_child(parent_bs, p_child, errp); 4430 } 4431 4432 if (has_node) { 4433 new_bs = bdrv_find_node(node); 4434 if (!new_bs) { 4435 error_setg(errp, "Node '%s' not found", node); 4436 return; 4437 } 4438 bdrv_add_child(parent_bs, new_bs, errp); 4439 } 4440 } 4441 4442 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4443 { 4444 BlockJobInfoList *head = NULL, **p_next = &head; 4445 BlockJob *job; 4446 4447 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4448 BlockJobInfoList *elem; 4449 AioContext *aio_context; 4450 4451 if (block_job_is_internal(job)) { 4452 continue; 4453 } 4454 elem = g_new0(BlockJobInfoList, 1); 4455 aio_context = blk_get_aio_context(job->blk); 4456 aio_context_acquire(aio_context); 4457 elem->value = block_job_query(job, errp); 4458 aio_context_release(aio_context); 4459 if (!elem->value) { 4460 g_free(elem); 4461 qapi_free_BlockJobInfoList(head); 4462 return NULL; 4463 } 4464 *p_next = elem; 4465 p_next = &elem->next; 4466 } 4467 4468 return head; 4469 } 4470 4471 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4472 bool has_force, bool force, Error **errp) 4473 { 4474 AioContext *old_context; 4475 AioContext *new_context; 4476 BlockDriverState *bs; 4477 4478 bs = bdrv_find_node(node_name); 4479 if (!bs) { 4480 error_setg(errp, "Cannot find node %s", node_name); 4481 return; 4482 } 4483 4484 /* Protects against accidents. */ 4485 if (!(has_force && force) && bdrv_has_blk(bs)) { 4486 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4487 "be in use (use force=true to override this check)", 4488 node_name); 4489 return; 4490 } 4491 4492 if (iothread->type == QTYPE_QSTRING) { 4493 IOThread *obj = iothread_by_id(iothread->u.s); 4494 if (!obj) { 4495 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4496 return; 4497 } 4498 4499 new_context = iothread_get_aio_context(obj); 4500 } else { 4501 new_context = qemu_get_aio_context(); 4502 } 4503 4504 old_context = bdrv_get_aio_context(bs); 4505 aio_context_acquire(old_context); 4506 4507 bdrv_try_set_aio_context(bs, new_context, errp); 4508 4509 aio_context_release(old_context); 4510 } 4511 4512 void qmp_block_latency_histogram_set( 4513 const char *id, 4514 bool has_boundaries, uint64List *boundaries, 4515 bool has_boundaries_read, uint64List *boundaries_read, 4516 bool has_boundaries_write, uint64List *boundaries_write, 4517 bool has_boundaries_flush, uint64List *boundaries_flush, 4518 Error **errp) 4519 { 4520 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4521 BlockAcctStats *stats; 4522 int ret; 4523 4524 if (!blk) { 4525 return; 4526 } 4527 4528 stats = blk_get_stats(blk); 4529 4530 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4531 !has_boundaries_flush) 4532 { 4533 block_latency_histograms_clear(stats); 4534 return; 4535 } 4536 4537 if (has_boundaries || has_boundaries_read) { 4538 ret = block_latency_histogram_set( 4539 stats, BLOCK_ACCT_READ, 4540 has_boundaries_read ? boundaries_read : boundaries); 4541 if (ret) { 4542 error_setg(errp, "Device '%s' set read boundaries fail", id); 4543 return; 4544 } 4545 } 4546 4547 if (has_boundaries || has_boundaries_write) { 4548 ret = block_latency_histogram_set( 4549 stats, BLOCK_ACCT_WRITE, 4550 has_boundaries_write ? boundaries_write : boundaries); 4551 if (ret) { 4552 error_setg(errp, "Device '%s' set write boundaries fail", id); 4553 return; 4554 } 4555 } 4556 4557 if (has_boundaries || has_boundaries_flush) { 4558 ret = block_latency_histogram_set( 4559 stats, BLOCK_ACCT_FLUSH, 4560 has_boundaries_flush ? boundaries_flush : boundaries); 4561 if (ret) { 4562 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4563 return; 4564 } 4565 } 4566 } 4567 4568 QemuOptsList qemu_common_drive_opts = { 4569 .name = "drive", 4570 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4571 .desc = { 4572 { 4573 .name = "snapshot", 4574 .type = QEMU_OPT_BOOL, 4575 .help = "enable/disable snapshot mode", 4576 },{ 4577 .name = "aio", 4578 .type = QEMU_OPT_STRING, 4579 .help = "host AIO implementation (threads, native)", 4580 },{ 4581 .name = BDRV_OPT_CACHE_WB, 4582 .type = QEMU_OPT_BOOL, 4583 .help = "Enable writeback mode", 4584 },{ 4585 .name = "format", 4586 .type = QEMU_OPT_STRING, 4587 .help = "disk format (raw, qcow2, ...)", 4588 },{ 4589 .name = "rerror", 4590 .type = QEMU_OPT_STRING, 4591 .help = "read error action", 4592 },{ 4593 .name = "werror", 4594 .type = QEMU_OPT_STRING, 4595 .help = "write error action", 4596 },{ 4597 .name = BDRV_OPT_READ_ONLY, 4598 .type = QEMU_OPT_BOOL, 4599 .help = "open drive file as read-only", 4600 }, 4601 4602 THROTTLE_OPTS, 4603 4604 { 4605 .name = "throttling.group", 4606 .type = QEMU_OPT_STRING, 4607 .help = "name of the block throttling group", 4608 },{ 4609 .name = "copy-on-read", 4610 .type = QEMU_OPT_BOOL, 4611 .help = "copy read data from backing file into image file", 4612 },{ 4613 .name = "detect-zeroes", 4614 .type = QEMU_OPT_STRING, 4615 .help = "try to optimize zero writes (off, on, unmap)", 4616 },{ 4617 .name = "stats-account-invalid", 4618 .type = QEMU_OPT_BOOL, 4619 .help = "whether to account for invalid I/O operations " 4620 "in the statistics", 4621 },{ 4622 .name = "stats-account-failed", 4623 .type = QEMU_OPT_BOOL, 4624 .help = "whether to account for failed I/O operations " 4625 "in the statistics", 4626 }, 4627 { /* end of list */ } 4628 }, 4629 }; 4630 4631 QemuOptsList qemu_drive_opts = { 4632 .name = "drive", 4633 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4634 .desc = { 4635 /* 4636 * no elements => accept any params 4637 * validation will happen later 4638 */ 4639 { /* end of list */ } 4640 }, 4641 }; 4642