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/config-file.h" 44 #include "qapi/qapi-commands-block.h" 45 #include "qapi/qapi-commands-transaction.h" 46 #include "qapi/qapi-visit-block-core.h" 47 #include "qapi/qmp/qdict.h" 48 #include "qapi/qmp/qnum.h" 49 #include "qapi/qmp/qstring.h" 50 #include "qapi/error.h" 51 #include "qapi/qmp/qerror.h" 52 #include "qapi/qmp/qlist.h" 53 #include "qapi/qobject-output-visitor.h" 54 #include "sysemu/sysemu.h" 55 #include "sysemu/iothread.h" 56 #include "block/block_int.h" 57 #include "block/trace.h" 58 #include "sysemu/arch_init.h" 59 #include "sysemu/qtest.h" 60 #include "qemu/cutils.h" 61 #include "qemu/help_option.h" 62 #include "qemu/throttle-options.h" 63 64 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 66 67 static int do_open_tray(const char *blk_name, const char *qdev_id, 68 bool force, Error **errp); 69 static void blockdev_remove_medium(bool has_device, const char *device, 70 bool has_id, const char *id, Error **errp); 71 static void blockdev_insert_medium(bool has_device, const char *device, 72 bool has_id, const char *id, 73 const char *node_name, Error **errp); 74 75 static const char *const if_name[IF_COUNT] = { 76 [IF_NONE] = "none", 77 [IF_IDE] = "ide", 78 [IF_SCSI] = "scsi", 79 [IF_FLOPPY] = "floppy", 80 [IF_PFLASH] = "pflash", 81 [IF_MTD] = "mtd", 82 [IF_SD] = "sd", 83 [IF_VIRTIO] = "virtio", 84 [IF_XEN] = "xen", 85 }; 86 87 static int if_max_devs[IF_COUNT] = { 88 /* 89 * Do not change these numbers! They govern how drive option 90 * index maps to unit and bus. That mapping is ABI. 91 * 92 * All controllers used to implement if=T drives need to support 93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 94 * Otherwise, some index values map to "impossible" bus, unit 95 * values. 96 * 97 * For instance, if you change [IF_SCSI] to 255, -drive 98 * if=scsi,index=12 no longer means bus=1,unit=5, but 99 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 100 * the drive can't be set up. Regression. 101 */ 102 [IF_IDE] = 2, 103 [IF_SCSI] = 7, 104 }; 105 106 /** 107 * Boards may call this to offer board-by-board overrides 108 * of the default, global values. 109 */ 110 void override_max_devs(BlockInterfaceType type, int max_devs) 111 { 112 BlockBackend *blk; 113 DriveInfo *dinfo; 114 115 if (max_devs <= 0) { 116 return; 117 } 118 119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 120 dinfo = blk_legacy_dinfo(blk); 121 if (dinfo->type == type) { 122 fprintf(stderr, "Cannot override units-per-bus property of" 123 " the %s interface, because a drive of that type has" 124 " already been added.\n", if_name[type]); 125 g_assert_not_reached(); 126 } 127 } 128 129 if_max_devs[type] = max_devs; 130 } 131 132 /* 133 * We automatically delete the drive when a device using it gets 134 * unplugged. Questionable feature, but we can't just drop it. 135 * Device models call blockdev_mark_auto_del() to schedule the 136 * automatic deletion, and generic qdev code calls blockdev_auto_del() 137 * when deletion is actually safe. 138 */ 139 void blockdev_mark_auto_del(BlockBackend *blk) 140 { 141 DriveInfo *dinfo = blk_legacy_dinfo(blk); 142 BlockDriverState *bs = blk_bs(blk); 143 AioContext *aio_context; 144 145 if (!dinfo) { 146 return; 147 } 148 149 if (bs) { 150 aio_context = bdrv_get_aio_context(bs); 151 aio_context_acquire(aio_context); 152 153 if (bs->job) { 154 job_cancel(&bs->job->job, false); 155 } 156 157 aio_context_release(aio_context); 158 } 159 160 dinfo->auto_del = 1; 161 } 162 163 void blockdev_auto_del(BlockBackend *blk) 164 { 165 DriveInfo *dinfo = blk_legacy_dinfo(blk); 166 167 if (dinfo && dinfo->auto_del) { 168 monitor_remove_blk(blk); 169 blk_unref(blk); 170 } 171 } 172 173 /** 174 * Returns the current mapping of how many units per bus 175 * a particular interface can support. 176 * 177 * A positive integer indicates n units per bus. 178 * 0 implies the mapping has not been established. 179 * -1 indicates an invalid BlockInterfaceType was given. 180 */ 181 int drive_get_max_devs(BlockInterfaceType type) 182 { 183 if (type >= IF_IDE && type < IF_COUNT) { 184 return if_max_devs[type]; 185 } 186 187 return -1; 188 } 189 190 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 191 { 192 int max_devs = if_max_devs[type]; 193 return max_devs ? index / max_devs : 0; 194 } 195 196 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 197 { 198 int max_devs = if_max_devs[type]; 199 return max_devs ? index % max_devs : index; 200 } 201 202 QemuOpts *drive_def(const char *optstr) 203 { 204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 205 } 206 207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 208 const char *optstr) 209 { 210 QemuOpts *opts; 211 212 opts = drive_def(optstr); 213 if (!opts) { 214 return NULL; 215 } 216 if (type != IF_DEFAULT) { 217 qemu_opt_set(opts, "if", if_name[type], &error_abort); 218 } 219 if (index >= 0) { 220 qemu_opt_set_number(opts, "index", index, &error_abort); 221 } 222 if (file) 223 qemu_opt_set(opts, "file", file, &error_abort); 224 return opts; 225 } 226 227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 228 { 229 BlockBackend *blk; 230 DriveInfo *dinfo; 231 232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 233 dinfo = blk_legacy_dinfo(blk); 234 if (dinfo && dinfo->type == type 235 && dinfo->bus == bus && dinfo->unit == unit) { 236 return dinfo; 237 } 238 } 239 240 return NULL; 241 } 242 243 void drive_check_orphaned(void) 244 { 245 BlockBackend *blk; 246 DriveInfo *dinfo; 247 Location loc; 248 bool orphans = false; 249 250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 251 dinfo = blk_legacy_dinfo(blk); 252 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 253 dinfo->type != IF_NONE) { 254 loc_push_none(&loc); 255 qemu_opts_loc_restore(dinfo->opts); 256 error_report("machine type does not support" 257 " if=%s,bus=%d,unit=%d", 258 if_name[dinfo->type], dinfo->bus, dinfo->unit); 259 loc_pop(&loc); 260 orphans = true; 261 } 262 } 263 264 if (orphans) { 265 exit(1); 266 } 267 } 268 269 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 270 { 271 return drive_get(type, 272 drive_index_to_bus_id(type, index), 273 drive_index_to_unit_id(type, index)); 274 } 275 276 int drive_get_max_bus(BlockInterfaceType type) 277 { 278 int max_bus; 279 BlockBackend *blk; 280 DriveInfo *dinfo; 281 282 max_bus = -1; 283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 284 dinfo = blk_legacy_dinfo(blk); 285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 286 max_bus = dinfo->bus; 287 } 288 } 289 return max_bus; 290 } 291 292 /* Get a block device. This should only be used for single-drive devices 293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 294 appropriate bus. */ 295 DriveInfo *drive_get_next(BlockInterfaceType type) 296 { 297 static int next_block_unit[IF_COUNT]; 298 299 return drive_get(type, 0, next_block_unit[type]++); 300 } 301 302 static void bdrv_format_print(void *opaque, const char *name) 303 { 304 error_printf(" %s", name); 305 } 306 307 typedef struct { 308 QEMUBH *bh; 309 BlockDriverState *bs; 310 } BDRVPutRefBH; 311 312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 313 { 314 if (!strcmp(buf, "ignore")) { 315 return BLOCKDEV_ON_ERROR_IGNORE; 316 } else if (!is_read && !strcmp(buf, "enospc")) { 317 return BLOCKDEV_ON_ERROR_ENOSPC; 318 } else if (!strcmp(buf, "stop")) { 319 return BLOCKDEV_ON_ERROR_STOP; 320 } else if (!strcmp(buf, "report")) { 321 return BLOCKDEV_ON_ERROR_REPORT; 322 } else { 323 error_setg(errp, "'%s' invalid %s error action", 324 buf, is_read ? "read" : "write"); 325 return -1; 326 } 327 } 328 329 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 330 Error **errp) 331 { 332 const QListEntry *entry; 333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 334 switch (qobject_type(entry->value)) { 335 336 case QTYPE_QSTRING: { 337 unsigned long long length; 338 const char *str = qstring_get_str(qobject_to(QString, 339 entry->value)); 340 if (parse_uint_full(str, &length, 10) == 0 && 341 length > 0 && length <= UINT_MAX) { 342 block_acct_add_interval(stats, (unsigned) length); 343 } else { 344 error_setg(errp, "Invalid interval length: %s", str); 345 return false; 346 } 347 break; 348 } 349 350 case QTYPE_QNUM: { 351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 352 353 if (length > 0 && length <= UINT_MAX) { 354 block_acct_add_interval(stats, (unsigned) length); 355 } else { 356 error_setg(errp, "Invalid interval length: %" PRId64, length); 357 return false; 358 } 359 break; 360 } 361 362 default: 363 error_setg(errp, "The specification of stats-intervals is invalid"); 364 return false; 365 } 366 } 367 return true; 368 } 369 370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 371 372 /* All parameters but @opts are optional and may be set to NULL. */ 373 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 374 const char **throttling_group, ThrottleConfig *throttle_cfg, 375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 376 { 377 Error *local_error = NULL; 378 const char *aio; 379 380 if (bdrv_flags) { 381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 382 *bdrv_flags |= BDRV_O_COPY_ON_READ; 383 } 384 385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 386 if (!strcmp(aio, "native")) { 387 *bdrv_flags |= BDRV_O_NATIVE_AIO; 388 } else if (!strcmp(aio, "threads")) { 389 /* this is the default */ 390 } else { 391 error_setg(errp, "invalid aio option"); 392 return; 393 } 394 } 395 } 396 397 /* disk I/O throttling */ 398 if (throttling_group) { 399 *throttling_group = qemu_opt_get(opts, "throttling.group"); 400 } 401 402 if (throttle_cfg) { 403 throttle_config_init(throttle_cfg); 404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 405 qemu_opt_get_number(opts, "throttling.bps-total", 0); 406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 407 qemu_opt_get_number(opts, "throttling.bps-read", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 409 qemu_opt_get_number(opts, "throttling.bps-write", 0); 410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 411 qemu_opt_get_number(opts, "throttling.iops-total", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 413 qemu_opt_get_number(opts, "throttling.iops-read", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 415 qemu_opt_get_number(opts, "throttling.iops-write", 0); 416 417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 419 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 425 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 429 430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 442 443 throttle_cfg->op_size = 444 qemu_opt_get_number(opts, "throttling.iops-size", 0); 445 446 if (!throttle_is_valid(throttle_cfg, errp)) { 447 return; 448 } 449 } 450 451 if (detect_zeroes) { 452 *detect_zeroes = 453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 454 qemu_opt_get(opts, "detect-zeroes"), 455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 456 &local_error); 457 if (local_error) { 458 error_propagate(errp, local_error); 459 return; 460 } 461 } 462 } 463 464 /* Takes the ownership of bs_opts */ 465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 466 Error **errp) 467 { 468 const char *buf; 469 int bdrv_flags = 0; 470 int on_read_error, on_write_error; 471 bool account_invalid, account_failed; 472 bool writethrough, read_only; 473 BlockBackend *blk; 474 BlockDriverState *bs; 475 ThrottleConfig cfg; 476 int snapshot = 0; 477 Error *error = NULL; 478 QemuOpts *opts; 479 QDict *interval_dict = NULL; 480 QList *interval_list = NULL; 481 const char *id; 482 BlockdevDetectZeroesOptions detect_zeroes = 483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 484 const char *throttling_group = NULL; 485 486 /* Check common options by copying from bs_opts to opts, all other options 487 * stay in bs_opts for processing by bdrv_open(). */ 488 id = qdict_get_try_str(bs_opts, "id"); 489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 490 if (error) { 491 error_propagate(errp, error); 492 goto err_no_opts; 493 } 494 495 qemu_opts_absorb_qdict(opts, bs_opts, &error); 496 if (error) { 497 error_propagate(errp, error); 498 goto early_err; 499 } 500 501 if (id) { 502 qdict_del(bs_opts, "id"); 503 } 504 505 /* extract parameters */ 506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 507 508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 510 511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 512 513 id = qemu_opts_id(opts); 514 515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 516 qdict_array_split(interval_dict, &interval_list); 517 518 if (qdict_size(interval_dict) != 0) { 519 error_setg(errp, "Invalid option stats-intervals.%s", 520 qdict_first(interval_dict)->key); 521 goto early_err; 522 } 523 524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 525 &detect_zeroes, &error); 526 if (error) { 527 error_propagate(errp, error); 528 goto early_err; 529 } 530 531 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 532 if (is_help_option(buf)) { 533 error_printf("Supported formats:"); 534 bdrv_iterate_format(bdrv_format_print, NULL, false); 535 error_printf("\nSupported formats (read-only):"); 536 bdrv_iterate_format(bdrv_format_print, NULL, true); 537 error_printf("\n"); 538 goto early_err; 539 } 540 541 if (qdict_haskey(bs_opts, "driver")) { 542 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 543 goto early_err; 544 } 545 qdict_put_str(bs_opts, "driver", buf); 546 } 547 548 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 549 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 550 on_write_error = parse_block_error_action(buf, 0, &error); 551 if (error) { 552 error_propagate(errp, error); 553 goto early_err; 554 } 555 } 556 557 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 558 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 559 on_read_error = parse_block_error_action(buf, 1, &error); 560 if (error) { 561 error_propagate(errp, error); 562 goto early_err; 563 } 564 } 565 566 if (snapshot) { 567 bdrv_flags |= BDRV_O_SNAPSHOT; 568 } 569 570 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 571 572 /* init */ 573 if ((!file || !*file) && !qdict_size(bs_opts)) { 574 BlockBackendRootState *blk_rs; 575 576 blk = blk_new(0, BLK_PERM_ALL); 577 blk_rs = blk_get_root_state(blk); 578 blk_rs->open_flags = bdrv_flags; 579 blk_rs->read_only = read_only; 580 blk_rs->detect_zeroes = detect_zeroes; 581 582 qobject_unref(bs_opts); 583 } else { 584 if (file && !*file) { 585 file = NULL; 586 } 587 588 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 589 * with other callers) rather than what we want as the real defaults. 590 * Apply the defaults here instead. */ 591 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 593 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 594 read_only ? "on" : "off"); 595 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 596 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 597 598 if (runstate_check(RUN_STATE_INMIGRATE)) { 599 bdrv_flags |= BDRV_O_INACTIVE; 600 } 601 602 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 603 if (!blk) { 604 goto err_no_bs_opts; 605 } 606 bs = blk_bs(blk); 607 608 bs->detect_zeroes = detect_zeroes; 609 610 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 611 612 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 613 blk_unref(blk); 614 blk = NULL; 615 goto err_no_bs_opts; 616 } 617 } 618 619 /* disk I/O throttling */ 620 if (throttle_enabled(&cfg)) { 621 if (!throttling_group) { 622 throttling_group = id; 623 } 624 blk_io_limits_enable(blk, throttling_group); 625 blk_set_io_limits(blk, &cfg); 626 } 627 628 blk_set_enable_write_cache(blk, !writethrough); 629 blk_set_on_error(blk, on_read_error, on_write_error); 630 631 if (!monitor_add_blk(blk, id, errp)) { 632 blk_unref(blk); 633 blk = NULL; 634 goto err_no_bs_opts; 635 } 636 637 err_no_bs_opts: 638 qemu_opts_del(opts); 639 qobject_unref(interval_dict); 640 qobject_unref(interval_list); 641 return blk; 642 643 early_err: 644 qemu_opts_del(opts); 645 qobject_unref(interval_dict); 646 qobject_unref(interval_list); 647 err_no_opts: 648 qobject_unref(bs_opts); 649 return NULL; 650 } 651 652 /* Takes the ownership of bs_opts */ 653 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 654 { 655 int bdrv_flags = 0; 656 657 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 658 * with other callers) rather than what we want as the real defaults. 659 * Apply the defaults here instead. */ 660 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 661 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 662 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 663 664 if (runstate_check(RUN_STATE_INMIGRATE)) { 665 bdrv_flags |= BDRV_O_INACTIVE; 666 } 667 668 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 669 } 670 671 void blockdev_close_all_bdrv_states(void) 672 { 673 BlockDriverState *bs, *next_bs; 674 675 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 676 AioContext *ctx = bdrv_get_aio_context(bs); 677 678 aio_context_acquire(ctx); 679 bdrv_unref(bs); 680 aio_context_release(ctx); 681 } 682 } 683 684 /* Iterates over the list of monitor-owned BlockDriverStates */ 685 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 686 { 687 return bs ? QTAILQ_NEXT(bs, monitor_list) 688 : QTAILQ_FIRST(&monitor_bdrv_states); 689 } 690 691 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 692 Error **errp) 693 { 694 const char *value; 695 696 value = qemu_opt_get(opts, from); 697 if (value) { 698 if (qemu_opt_find(opts, to)) { 699 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 700 "same time", to, from); 701 return; 702 } 703 } 704 705 /* rename all items in opts */ 706 while ((value = qemu_opt_get(opts, from))) { 707 qemu_opt_set(opts, to, value, &error_abort); 708 qemu_opt_unset(opts, from); 709 } 710 } 711 712 QemuOptsList qemu_legacy_drive_opts = { 713 .name = "drive", 714 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 715 .desc = { 716 { 717 .name = "bus", 718 .type = QEMU_OPT_NUMBER, 719 .help = "bus number", 720 },{ 721 .name = "unit", 722 .type = QEMU_OPT_NUMBER, 723 .help = "unit number (i.e. lun for scsi)", 724 },{ 725 .name = "index", 726 .type = QEMU_OPT_NUMBER, 727 .help = "index number", 728 },{ 729 .name = "media", 730 .type = QEMU_OPT_STRING, 731 .help = "media type (disk, cdrom)", 732 },{ 733 .name = "if", 734 .type = QEMU_OPT_STRING, 735 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 736 },{ 737 .name = "file", 738 .type = QEMU_OPT_STRING, 739 .help = "file name", 740 }, 741 742 /* Options that are passed on, but have special semantics with -drive */ 743 { 744 .name = BDRV_OPT_READ_ONLY, 745 .type = QEMU_OPT_BOOL, 746 .help = "open drive file as read-only", 747 },{ 748 .name = "rerror", 749 .type = QEMU_OPT_STRING, 750 .help = "read error action", 751 },{ 752 .name = "werror", 753 .type = QEMU_OPT_STRING, 754 .help = "write error action", 755 },{ 756 .name = "copy-on-read", 757 .type = QEMU_OPT_BOOL, 758 .help = "copy read data from backing file into image file", 759 }, 760 761 { /* end of list */ } 762 }, 763 }; 764 765 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 766 Error **errp) 767 { 768 const char *value; 769 BlockBackend *blk; 770 DriveInfo *dinfo = NULL; 771 QDict *bs_opts; 772 QemuOpts *legacy_opts; 773 DriveMediaType media = MEDIA_DISK; 774 BlockInterfaceType type; 775 int max_devs, bus_id, unit_id, index; 776 const char *werror, *rerror; 777 bool read_only = false; 778 bool copy_on_read; 779 const char *filename; 780 Error *local_err = NULL; 781 int i; 782 783 /* Change legacy command line options into QMP ones */ 784 static const struct { 785 const char *from; 786 const char *to; 787 } opt_renames[] = { 788 { "iops", "throttling.iops-total" }, 789 { "iops_rd", "throttling.iops-read" }, 790 { "iops_wr", "throttling.iops-write" }, 791 792 { "bps", "throttling.bps-total" }, 793 { "bps_rd", "throttling.bps-read" }, 794 { "bps_wr", "throttling.bps-write" }, 795 796 { "iops_max", "throttling.iops-total-max" }, 797 { "iops_rd_max", "throttling.iops-read-max" }, 798 { "iops_wr_max", "throttling.iops-write-max" }, 799 800 { "bps_max", "throttling.bps-total-max" }, 801 { "bps_rd_max", "throttling.bps-read-max" }, 802 { "bps_wr_max", "throttling.bps-write-max" }, 803 804 { "iops_size", "throttling.iops-size" }, 805 806 { "group", "throttling.group" }, 807 808 { "readonly", BDRV_OPT_READ_ONLY }, 809 }; 810 811 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 812 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 813 &local_err); 814 if (local_err) { 815 error_propagate(errp, local_err); 816 return NULL; 817 } 818 } 819 820 value = qemu_opt_get(all_opts, "cache"); 821 if (value) { 822 int flags = 0; 823 bool writethrough; 824 825 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 826 error_setg(errp, "invalid cache option"); 827 return NULL; 828 } 829 830 /* Specific options take precedence */ 831 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 832 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 833 !writethrough, &error_abort); 834 } 835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 837 !!(flags & BDRV_O_NOCACHE), &error_abort); 838 } 839 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 840 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 841 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 842 } 843 qemu_opt_unset(all_opts, "cache"); 844 } 845 846 /* Get a QDict for processing the options */ 847 bs_opts = qdict_new(); 848 qemu_opts_to_qdict(all_opts, bs_opts); 849 850 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 851 &error_abort); 852 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 853 if (local_err) { 854 error_propagate(errp, local_err); 855 goto fail; 856 } 857 858 /* Media type */ 859 value = qemu_opt_get(legacy_opts, "media"); 860 if (value) { 861 if (!strcmp(value, "disk")) { 862 media = MEDIA_DISK; 863 } else if (!strcmp(value, "cdrom")) { 864 media = MEDIA_CDROM; 865 read_only = true; 866 } else { 867 error_setg(errp, "'%s' invalid media", value); 868 goto fail; 869 } 870 } 871 872 /* copy-on-read is disabled with a warning for read-only devices */ 873 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 874 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 875 876 if (read_only && copy_on_read) { 877 warn_report("disabling copy-on-read on read-only drive"); 878 copy_on_read = false; 879 } 880 881 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 882 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 883 884 /* Controller type */ 885 value = qemu_opt_get(legacy_opts, "if"); 886 if (value) { 887 for (type = 0; 888 type < IF_COUNT && strcmp(value, if_name[type]); 889 type++) { 890 } 891 if (type == IF_COUNT) { 892 error_setg(errp, "unsupported bus type '%s'", value); 893 goto fail; 894 } 895 } else { 896 type = block_default_type; 897 } 898 899 /* Device address specified by bus/unit or index. 900 * If none was specified, try to find the first free one. */ 901 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 902 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 903 index = qemu_opt_get_number(legacy_opts, "index", -1); 904 905 max_devs = if_max_devs[type]; 906 907 if (index != -1) { 908 if (bus_id != 0 || unit_id != -1) { 909 error_setg(errp, "index cannot be used with bus and unit"); 910 goto fail; 911 } 912 bus_id = drive_index_to_bus_id(type, index); 913 unit_id = drive_index_to_unit_id(type, index); 914 } 915 916 if (unit_id == -1) { 917 unit_id = 0; 918 while (drive_get(type, bus_id, unit_id) != NULL) { 919 unit_id++; 920 if (max_devs && unit_id >= max_devs) { 921 unit_id -= max_devs; 922 bus_id++; 923 } 924 } 925 } 926 927 if (max_devs && unit_id >= max_devs) { 928 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 929 goto fail; 930 } 931 932 if (drive_get(type, bus_id, unit_id) != NULL) { 933 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 934 bus_id, unit_id, index); 935 goto fail; 936 } 937 938 /* no id supplied -> create one */ 939 if (qemu_opts_id(all_opts) == NULL) { 940 char *new_id; 941 const char *mediastr = ""; 942 if (type == IF_IDE || type == IF_SCSI) { 943 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 944 } 945 if (max_devs) { 946 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 947 mediastr, unit_id); 948 } else { 949 new_id = g_strdup_printf("%s%s%i", if_name[type], 950 mediastr, unit_id); 951 } 952 qdict_put_str(bs_opts, "id", new_id); 953 g_free(new_id); 954 } 955 956 /* Add virtio block device */ 957 if (type == IF_VIRTIO) { 958 QemuOpts *devopts; 959 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 960 &error_abort); 961 if (arch_type == QEMU_ARCH_S390X) { 962 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 963 } else { 964 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 965 } 966 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 967 &error_abort); 968 } 969 970 filename = qemu_opt_get(legacy_opts, "file"); 971 972 /* Check werror/rerror compatibility with if=... */ 973 werror = qemu_opt_get(legacy_opts, "werror"); 974 if (werror != NULL) { 975 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 976 type != IF_NONE) { 977 error_setg(errp, "werror is not supported by this bus type"); 978 goto fail; 979 } 980 qdict_put_str(bs_opts, "werror", werror); 981 } 982 983 rerror = qemu_opt_get(legacy_opts, "rerror"); 984 if (rerror != NULL) { 985 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 986 type != IF_NONE) { 987 error_setg(errp, "rerror is not supported by this bus type"); 988 goto fail; 989 } 990 qdict_put_str(bs_opts, "rerror", rerror); 991 } 992 993 /* Actual block device init: Functionality shared with blockdev-add */ 994 blk = blockdev_init(filename, bs_opts, &local_err); 995 bs_opts = NULL; 996 if (!blk) { 997 error_propagate(errp, local_err); 998 goto fail; 999 } else { 1000 assert(!local_err); 1001 } 1002 1003 /* Create legacy DriveInfo */ 1004 dinfo = g_malloc0(sizeof(*dinfo)); 1005 dinfo->opts = all_opts; 1006 1007 dinfo->type = type; 1008 dinfo->bus = bus_id; 1009 dinfo->unit = unit_id; 1010 1011 blk_set_legacy_dinfo(blk, dinfo); 1012 1013 switch(type) { 1014 case IF_IDE: 1015 case IF_SCSI: 1016 case IF_XEN: 1017 case IF_NONE: 1018 dinfo->media_cd = media == MEDIA_CDROM; 1019 break; 1020 default: 1021 break; 1022 } 1023 1024 fail: 1025 qemu_opts_del(legacy_opts); 1026 qobject_unref(bs_opts); 1027 return dinfo; 1028 } 1029 1030 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1031 { 1032 BlockDriverState *bs; 1033 1034 bs = bdrv_lookup_bs(name, name, errp); 1035 if (bs == NULL) { 1036 return NULL; 1037 } 1038 1039 if (!bdrv_is_root_node(bs)) { 1040 error_setg(errp, "Need a root block node"); 1041 return NULL; 1042 } 1043 1044 if (!bdrv_is_inserted(bs)) { 1045 error_setg(errp, "Device has no medium"); 1046 return NULL; 1047 } 1048 1049 return bs; 1050 } 1051 1052 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1053 Error **errp) 1054 { 1055 BlockBackend *blk; 1056 1057 if (!blk_name == !qdev_id) { 1058 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1059 return NULL; 1060 } 1061 1062 if (qdev_id) { 1063 blk = blk_by_qdev_id(qdev_id, errp); 1064 } else { 1065 blk = blk_by_name(blk_name); 1066 if (blk == NULL) { 1067 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1068 "Device '%s' not found", blk_name); 1069 } 1070 } 1071 1072 return blk; 1073 } 1074 1075 void hmp_commit(Monitor *mon, const QDict *qdict) 1076 { 1077 const char *device = qdict_get_str(qdict, "device"); 1078 BlockBackend *blk; 1079 int ret; 1080 1081 if (!strcmp(device, "all")) { 1082 ret = blk_commit_all(); 1083 } else { 1084 BlockDriverState *bs; 1085 AioContext *aio_context; 1086 1087 blk = blk_by_name(device); 1088 if (!blk) { 1089 monitor_printf(mon, "Device '%s' not found\n", device); 1090 return; 1091 } 1092 if (!blk_is_available(blk)) { 1093 monitor_printf(mon, "Device '%s' has no medium\n", device); 1094 return; 1095 } 1096 1097 bs = blk_bs(blk); 1098 aio_context = bdrv_get_aio_context(bs); 1099 aio_context_acquire(aio_context); 1100 1101 ret = bdrv_commit(bs); 1102 1103 aio_context_release(aio_context); 1104 } 1105 if (ret < 0) { 1106 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1107 strerror(-ret)); 1108 } 1109 } 1110 1111 static void blockdev_do_action(TransactionAction *action, Error **errp) 1112 { 1113 TransactionActionList list; 1114 1115 list.value = action; 1116 list.next = NULL; 1117 qmp_transaction(&list, false, NULL, errp); 1118 } 1119 1120 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1121 bool has_node_name, const char *node_name, 1122 const char *snapshot_file, 1123 bool has_snapshot_node_name, 1124 const char *snapshot_node_name, 1125 bool has_format, const char *format, 1126 bool has_mode, NewImageMode mode, Error **errp) 1127 { 1128 BlockdevSnapshotSync snapshot = { 1129 .has_device = has_device, 1130 .device = (char *) device, 1131 .has_node_name = has_node_name, 1132 .node_name = (char *) node_name, 1133 .snapshot_file = (char *) snapshot_file, 1134 .has_snapshot_node_name = has_snapshot_node_name, 1135 .snapshot_node_name = (char *) snapshot_node_name, 1136 .has_format = has_format, 1137 .format = (char *) format, 1138 .has_mode = has_mode, 1139 .mode = mode, 1140 }; 1141 TransactionAction action = { 1142 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1143 .u.blockdev_snapshot_sync.data = &snapshot, 1144 }; 1145 blockdev_do_action(&action, errp); 1146 } 1147 1148 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1149 Error **errp) 1150 { 1151 BlockdevSnapshot snapshot_data = { 1152 .node = (char *) node, 1153 .overlay = (char *) overlay 1154 }; 1155 TransactionAction action = { 1156 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1157 .u.blockdev_snapshot.data = &snapshot_data, 1158 }; 1159 blockdev_do_action(&action, errp); 1160 } 1161 1162 void qmp_blockdev_snapshot_internal_sync(const char *device, 1163 const char *name, 1164 Error **errp) 1165 { 1166 BlockdevSnapshotInternal snapshot = { 1167 .device = (char *) device, 1168 .name = (char *) name 1169 }; 1170 TransactionAction action = { 1171 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1172 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1173 }; 1174 blockdev_do_action(&action, errp); 1175 } 1176 1177 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1178 bool has_id, 1179 const char *id, 1180 bool has_name, 1181 const char *name, 1182 Error **errp) 1183 { 1184 BlockDriverState *bs; 1185 AioContext *aio_context; 1186 QEMUSnapshotInfo sn; 1187 Error *local_err = NULL; 1188 SnapshotInfo *info = NULL; 1189 int ret; 1190 1191 bs = qmp_get_root_bs(device, errp); 1192 if (!bs) { 1193 return NULL; 1194 } 1195 aio_context = bdrv_get_aio_context(bs); 1196 aio_context_acquire(aio_context); 1197 1198 if (!has_id) { 1199 id = NULL; 1200 } 1201 1202 if (!has_name) { 1203 name = NULL; 1204 } 1205 1206 if (!id && !name) { 1207 error_setg(errp, "Name or id must be provided"); 1208 goto out_aio_context; 1209 } 1210 1211 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1212 goto out_aio_context; 1213 } 1214 1215 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1216 if (local_err) { 1217 error_propagate(errp, local_err); 1218 goto out_aio_context; 1219 } 1220 if (!ret) { 1221 error_setg(errp, 1222 "Snapshot with id '%s' and name '%s' does not exist on " 1223 "device '%s'", 1224 STR_OR_NULL(id), STR_OR_NULL(name), device); 1225 goto out_aio_context; 1226 } 1227 1228 bdrv_snapshot_delete(bs, id, name, &local_err); 1229 if (local_err) { 1230 error_propagate(errp, local_err); 1231 goto out_aio_context; 1232 } 1233 1234 aio_context_release(aio_context); 1235 1236 info = g_new0(SnapshotInfo, 1); 1237 info->id = g_strdup(sn.id_str); 1238 info->name = g_strdup(sn.name); 1239 info->date_nsec = sn.date_nsec; 1240 info->date_sec = sn.date_sec; 1241 info->vm_state_size = sn.vm_state_size; 1242 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1243 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1244 1245 return info; 1246 1247 out_aio_context: 1248 aio_context_release(aio_context); 1249 return NULL; 1250 } 1251 1252 /** 1253 * block_dirty_bitmap_lookup: 1254 * Return a dirty bitmap (if present), after validating 1255 * the node reference and bitmap names. 1256 * 1257 * @node: The name of the BDS node to search for bitmaps 1258 * @name: The name of the bitmap to search for 1259 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1260 * @errp: Output pointer for error information. Can be NULL. 1261 * 1262 * @return: A bitmap object on success, or NULL on failure. 1263 */ 1264 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1265 const char *name, 1266 BlockDriverState **pbs, 1267 Error **errp) 1268 { 1269 BlockDriverState *bs; 1270 BdrvDirtyBitmap *bitmap; 1271 1272 if (!node) { 1273 error_setg(errp, "Node cannot be NULL"); 1274 return NULL; 1275 } 1276 if (!name) { 1277 error_setg(errp, "Bitmap name cannot be NULL"); 1278 return NULL; 1279 } 1280 bs = bdrv_lookup_bs(node, node, NULL); 1281 if (!bs) { 1282 error_setg(errp, "Node '%s' not found", node); 1283 return NULL; 1284 } 1285 1286 bitmap = bdrv_find_dirty_bitmap(bs, name); 1287 if (!bitmap) { 1288 error_setg(errp, "Dirty bitmap '%s' not found", name); 1289 return NULL; 1290 } 1291 1292 if (pbs) { 1293 *pbs = bs; 1294 } 1295 1296 return bitmap; 1297 } 1298 1299 /* New and old BlockDriverState structs for atomic group operations */ 1300 1301 typedef struct BlkActionState BlkActionState; 1302 1303 /** 1304 * BlkActionOps: 1305 * Table of operations that define an Action. 1306 * 1307 * @instance_size: Size of state struct, in bytes. 1308 * @prepare: Prepare the work, must NOT be NULL. 1309 * @commit: Commit the changes, can be NULL. 1310 * @abort: Abort the changes on fail, can be NULL. 1311 * @clean: Clean up resources after all transaction actions have called 1312 * commit() or abort(). Can be NULL. 1313 * 1314 * Only prepare() may fail. In a single transaction, only one of commit() or 1315 * abort() will be called. clean() will always be called if it is present. 1316 */ 1317 typedef struct BlkActionOps { 1318 size_t instance_size; 1319 void (*prepare)(BlkActionState *common, Error **errp); 1320 void (*commit)(BlkActionState *common); 1321 void (*abort)(BlkActionState *common); 1322 void (*clean)(BlkActionState *common); 1323 } BlkActionOps; 1324 1325 /** 1326 * BlkActionState: 1327 * Describes one Action's state within a Transaction. 1328 * 1329 * @action: QAPI-defined enum identifying which Action to perform. 1330 * @ops: Table of ActionOps this Action can perform. 1331 * @block_job_txn: Transaction which this action belongs to. 1332 * @entry: List membership for all Actions in this Transaction. 1333 * 1334 * This structure must be arranged as first member in a subclassed type, 1335 * assuming that the compiler will also arrange it to the same offsets as the 1336 * base class. 1337 */ 1338 struct BlkActionState { 1339 TransactionAction *action; 1340 const BlkActionOps *ops; 1341 JobTxn *block_job_txn; 1342 TransactionProperties *txn_props; 1343 QTAILQ_ENTRY(BlkActionState) entry; 1344 }; 1345 1346 /* internal snapshot private data */ 1347 typedef struct InternalSnapshotState { 1348 BlkActionState common; 1349 BlockDriverState *bs; 1350 QEMUSnapshotInfo sn; 1351 bool created; 1352 } InternalSnapshotState; 1353 1354 1355 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1356 { 1357 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1358 error_setg(errp, 1359 "Action '%s' does not support Transaction property " 1360 "completion-mode = %s", 1361 TransactionActionKind_str(s->action->type), 1362 ActionCompletionMode_str(s->txn_props->completion_mode)); 1363 return -1; 1364 } 1365 return 0; 1366 } 1367 1368 static void internal_snapshot_prepare(BlkActionState *common, 1369 Error **errp) 1370 { 1371 Error *local_err = NULL; 1372 const char *device; 1373 const char *name; 1374 BlockDriverState *bs; 1375 QEMUSnapshotInfo old_sn, *sn; 1376 bool ret; 1377 qemu_timeval tv; 1378 BlockdevSnapshotInternal *internal; 1379 InternalSnapshotState *state; 1380 AioContext *aio_context; 1381 int ret1; 1382 1383 g_assert(common->action->type == 1384 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1385 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1386 state = DO_UPCAST(InternalSnapshotState, common, common); 1387 1388 /* 1. parse input */ 1389 device = internal->device; 1390 name = internal->name; 1391 1392 /* 2. check for validation */ 1393 if (action_check_completion_mode(common, errp) < 0) { 1394 return; 1395 } 1396 1397 bs = qmp_get_root_bs(device, errp); 1398 if (!bs) { 1399 return; 1400 } 1401 1402 aio_context = bdrv_get_aio_context(bs); 1403 aio_context_acquire(aio_context); 1404 1405 state->bs = bs; 1406 1407 /* Paired with .clean() */ 1408 bdrv_drained_begin(bs); 1409 1410 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1411 goto out; 1412 } 1413 1414 if (bdrv_is_read_only(bs)) { 1415 error_setg(errp, "Device '%s' is read only", device); 1416 goto out; 1417 } 1418 1419 if (!bdrv_can_snapshot(bs)) { 1420 error_setg(errp, "Block format '%s' used by device '%s' " 1421 "does not support internal snapshots", 1422 bs->drv->format_name, device); 1423 goto out; 1424 } 1425 1426 if (!strlen(name)) { 1427 error_setg(errp, "Name is empty"); 1428 goto out; 1429 } 1430 1431 /* check whether a snapshot with name exist */ 1432 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1433 &local_err); 1434 if (local_err) { 1435 error_propagate(errp, local_err); 1436 goto out; 1437 } else if (ret) { 1438 error_setg(errp, 1439 "Snapshot with name '%s' already exists on device '%s'", 1440 name, device); 1441 goto out; 1442 } 1443 1444 /* 3. take the snapshot */ 1445 sn = &state->sn; 1446 pstrcpy(sn->name, sizeof(sn->name), name); 1447 qemu_gettimeofday(&tv); 1448 sn->date_sec = tv.tv_sec; 1449 sn->date_nsec = tv.tv_usec * 1000; 1450 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1451 1452 ret1 = bdrv_snapshot_create(bs, sn); 1453 if (ret1 < 0) { 1454 error_setg_errno(errp, -ret1, 1455 "Failed to create snapshot '%s' on device '%s'", 1456 name, device); 1457 goto out; 1458 } 1459 1460 /* 4. succeed, mark a snapshot is created */ 1461 state->created = true; 1462 1463 out: 1464 aio_context_release(aio_context); 1465 } 1466 1467 static void internal_snapshot_abort(BlkActionState *common) 1468 { 1469 InternalSnapshotState *state = 1470 DO_UPCAST(InternalSnapshotState, common, common); 1471 BlockDriverState *bs = state->bs; 1472 QEMUSnapshotInfo *sn = &state->sn; 1473 AioContext *aio_context; 1474 Error *local_error = NULL; 1475 1476 if (!state->created) { 1477 return; 1478 } 1479 1480 aio_context = bdrv_get_aio_context(state->bs); 1481 aio_context_acquire(aio_context); 1482 1483 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1484 error_reportf_err(local_error, 1485 "Failed to delete snapshot with id '%s' and " 1486 "name '%s' on device '%s' in abort: ", 1487 sn->id_str, sn->name, 1488 bdrv_get_device_name(bs)); 1489 } 1490 1491 aio_context_release(aio_context); 1492 } 1493 1494 static void internal_snapshot_clean(BlkActionState *common) 1495 { 1496 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1497 common, common); 1498 AioContext *aio_context; 1499 1500 if (!state->bs) { 1501 return; 1502 } 1503 1504 aio_context = bdrv_get_aio_context(state->bs); 1505 aio_context_acquire(aio_context); 1506 1507 bdrv_drained_end(state->bs); 1508 1509 aio_context_release(aio_context); 1510 } 1511 1512 /* external snapshot private data */ 1513 typedef struct ExternalSnapshotState { 1514 BlkActionState common; 1515 BlockDriverState *old_bs; 1516 BlockDriverState *new_bs; 1517 bool overlay_appended; 1518 } ExternalSnapshotState; 1519 1520 static void external_snapshot_prepare(BlkActionState *common, 1521 Error **errp) 1522 { 1523 int flags = 0; 1524 QDict *options = NULL; 1525 Error *local_err = NULL; 1526 /* Device and node name of the image to generate the snapshot from */ 1527 const char *device; 1528 const char *node_name; 1529 /* Reference to the new image (for 'blockdev-snapshot') */ 1530 const char *snapshot_ref; 1531 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1532 const char *new_image_file; 1533 ExternalSnapshotState *state = 1534 DO_UPCAST(ExternalSnapshotState, common, common); 1535 TransactionAction *action = common->action; 1536 AioContext *aio_context; 1537 1538 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1539 * purpose but a different set of parameters */ 1540 switch (action->type) { 1541 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1542 { 1543 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1544 device = s->node; 1545 node_name = s->node; 1546 new_image_file = NULL; 1547 snapshot_ref = s->overlay; 1548 } 1549 break; 1550 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1551 { 1552 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1553 device = s->has_device ? s->device : NULL; 1554 node_name = s->has_node_name ? s->node_name : NULL; 1555 new_image_file = s->snapshot_file; 1556 snapshot_ref = NULL; 1557 } 1558 break; 1559 default: 1560 g_assert_not_reached(); 1561 } 1562 1563 /* start processing */ 1564 if (action_check_completion_mode(common, errp) < 0) { 1565 return; 1566 } 1567 1568 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1569 if (!state->old_bs) { 1570 return; 1571 } 1572 1573 aio_context = bdrv_get_aio_context(state->old_bs); 1574 aio_context_acquire(aio_context); 1575 1576 /* Paired with .clean() */ 1577 bdrv_drained_begin(state->old_bs); 1578 1579 if (!bdrv_is_inserted(state->old_bs)) { 1580 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1581 goto out; 1582 } 1583 1584 if (bdrv_op_is_blocked(state->old_bs, 1585 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1586 goto out; 1587 } 1588 1589 if (!bdrv_is_read_only(state->old_bs)) { 1590 if (bdrv_flush(state->old_bs)) { 1591 error_setg(errp, QERR_IO_ERROR); 1592 goto out; 1593 } 1594 } 1595 1596 if (!bdrv_is_first_non_filter(state->old_bs)) { 1597 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1598 goto out; 1599 } 1600 1601 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1602 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1603 const char *format = s->has_format ? s->format : "qcow2"; 1604 enum NewImageMode mode; 1605 const char *snapshot_node_name = 1606 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1607 1608 if (node_name && !snapshot_node_name) { 1609 error_setg(errp, "New snapshot node name missing"); 1610 goto out; 1611 } 1612 1613 if (snapshot_node_name && 1614 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1615 error_setg(errp, "New snapshot node name already in use"); 1616 goto out; 1617 } 1618 1619 flags = state->old_bs->open_flags; 1620 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1621 flags |= BDRV_O_NO_BACKING; 1622 1623 /* create new image w/backing file */ 1624 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1625 if (mode != NEW_IMAGE_MODE_EXISTING) { 1626 int64_t size = bdrv_getlength(state->old_bs); 1627 if (size < 0) { 1628 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1629 goto out; 1630 } 1631 bdrv_refresh_filename(state->old_bs); 1632 bdrv_img_create(new_image_file, format, 1633 state->old_bs->filename, 1634 state->old_bs->drv->format_name, 1635 NULL, size, flags, false, &local_err); 1636 if (local_err) { 1637 error_propagate(errp, local_err); 1638 goto out; 1639 } 1640 } 1641 1642 options = qdict_new(); 1643 if (snapshot_node_name) { 1644 qdict_put_str(options, "node-name", snapshot_node_name); 1645 } 1646 qdict_put_str(options, "driver", format); 1647 } 1648 1649 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1650 errp); 1651 /* We will manually add the backing_hd field to the bs later */ 1652 if (!state->new_bs) { 1653 goto out; 1654 } 1655 1656 if (bdrv_has_blk(state->new_bs)) { 1657 error_setg(errp, "The snapshot is already in use"); 1658 goto out; 1659 } 1660 1661 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1662 errp)) { 1663 goto out; 1664 } 1665 1666 if (state->new_bs->backing != NULL) { 1667 error_setg(errp, "The snapshot already has a backing image"); 1668 goto out; 1669 } 1670 1671 if (!state->new_bs->drv->supports_backing) { 1672 error_setg(errp, "The snapshot does not support backing images"); 1673 goto out; 1674 } 1675 1676 bdrv_set_aio_context(state->new_bs, aio_context); 1677 1678 /* This removes our old bs and adds the new bs. This is an operation that 1679 * can fail, so we need to do it in .prepare; undoing it for abort is 1680 * always possible. */ 1681 bdrv_ref(state->new_bs); 1682 bdrv_append(state->new_bs, state->old_bs, &local_err); 1683 if (local_err) { 1684 error_propagate(errp, local_err); 1685 goto out; 1686 } 1687 state->overlay_appended = true; 1688 1689 out: 1690 aio_context_release(aio_context); 1691 } 1692 1693 static void external_snapshot_commit(BlkActionState *common) 1694 { 1695 ExternalSnapshotState *state = 1696 DO_UPCAST(ExternalSnapshotState, common, common); 1697 AioContext *aio_context; 1698 1699 aio_context = bdrv_get_aio_context(state->old_bs); 1700 aio_context_acquire(aio_context); 1701 1702 /* We don't need (or want) to use the transactional 1703 * bdrv_reopen_multiple() across all the entries at once, because we 1704 * don't want to abort all of them if one of them fails the reopen */ 1705 if (!atomic_read(&state->old_bs->copy_on_read)) { 1706 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1707 } 1708 1709 aio_context_release(aio_context); 1710 } 1711 1712 static void external_snapshot_abort(BlkActionState *common) 1713 { 1714 ExternalSnapshotState *state = 1715 DO_UPCAST(ExternalSnapshotState, common, common); 1716 if (state->new_bs) { 1717 if (state->overlay_appended) { 1718 AioContext *aio_context; 1719 1720 aio_context = bdrv_get_aio_context(state->old_bs); 1721 aio_context_acquire(aio_context); 1722 1723 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1724 close state->old_bs; we need it */ 1725 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1726 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1727 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1728 1729 aio_context_release(aio_context); 1730 } 1731 } 1732 } 1733 1734 static void external_snapshot_clean(BlkActionState *common) 1735 { 1736 ExternalSnapshotState *state = 1737 DO_UPCAST(ExternalSnapshotState, common, common); 1738 AioContext *aio_context; 1739 1740 if (!state->old_bs) { 1741 return; 1742 } 1743 1744 aio_context = bdrv_get_aio_context(state->old_bs); 1745 aio_context_acquire(aio_context); 1746 1747 bdrv_drained_end(state->old_bs); 1748 bdrv_unref(state->new_bs); 1749 1750 aio_context_release(aio_context); 1751 } 1752 1753 typedef struct DriveBackupState { 1754 BlkActionState common; 1755 BlockDriverState *bs; 1756 BlockJob *job; 1757 } DriveBackupState; 1758 1759 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1760 Error **errp); 1761 1762 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1763 { 1764 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1765 BlockDriverState *bs; 1766 DriveBackup *backup; 1767 AioContext *aio_context; 1768 Error *local_err = NULL; 1769 1770 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1771 backup = common->action->u.drive_backup.data; 1772 1773 bs = qmp_get_root_bs(backup->device, errp); 1774 if (!bs) { 1775 return; 1776 } 1777 1778 aio_context = bdrv_get_aio_context(bs); 1779 aio_context_acquire(aio_context); 1780 1781 /* Paired with .clean() */ 1782 bdrv_drained_begin(bs); 1783 1784 state->bs = bs; 1785 1786 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1787 if (local_err) { 1788 error_propagate(errp, local_err); 1789 goto out; 1790 } 1791 1792 out: 1793 aio_context_release(aio_context); 1794 } 1795 1796 static void drive_backup_commit(BlkActionState *common) 1797 { 1798 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1799 AioContext *aio_context; 1800 1801 aio_context = bdrv_get_aio_context(state->bs); 1802 aio_context_acquire(aio_context); 1803 1804 assert(state->job); 1805 job_start(&state->job->job); 1806 1807 aio_context_release(aio_context); 1808 } 1809 1810 static void drive_backup_abort(BlkActionState *common) 1811 { 1812 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1813 1814 if (state->job) { 1815 AioContext *aio_context; 1816 1817 aio_context = bdrv_get_aio_context(state->bs); 1818 aio_context_acquire(aio_context); 1819 1820 job_cancel_sync(&state->job->job); 1821 1822 aio_context_release(aio_context); 1823 } 1824 } 1825 1826 static void drive_backup_clean(BlkActionState *common) 1827 { 1828 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1829 AioContext *aio_context; 1830 1831 if (!state->bs) { 1832 return; 1833 } 1834 1835 aio_context = bdrv_get_aio_context(state->bs); 1836 aio_context_acquire(aio_context); 1837 1838 bdrv_drained_end(state->bs); 1839 1840 aio_context_release(aio_context); 1841 } 1842 1843 typedef struct BlockdevBackupState { 1844 BlkActionState common; 1845 BlockDriverState *bs; 1846 BlockJob *job; 1847 } BlockdevBackupState; 1848 1849 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1850 Error **errp); 1851 1852 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1853 { 1854 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1855 BlockdevBackup *backup; 1856 BlockDriverState *bs, *target; 1857 AioContext *aio_context; 1858 Error *local_err = NULL; 1859 1860 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1861 backup = common->action->u.blockdev_backup.data; 1862 1863 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1864 if (!bs) { 1865 return; 1866 } 1867 1868 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1869 if (!target) { 1870 return; 1871 } 1872 1873 aio_context = bdrv_get_aio_context(bs); 1874 if (aio_context != bdrv_get_aio_context(target)) { 1875 error_setg(errp, "Backup between two IO threads is not implemented"); 1876 return; 1877 } 1878 aio_context_acquire(aio_context); 1879 state->bs = bs; 1880 1881 /* Paired with .clean() */ 1882 bdrv_drained_begin(state->bs); 1883 1884 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1885 if (local_err) { 1886 error_propagate(errp, local_err); 1887 goto out; 1888 } 1889 1890 out: 1891 aio_context_release(aio_context); 1892 } 1893 1894 static void blockdev_backup_commit(BlkActionState *common) 1895 { 1896 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1897 AioContext *aio_context; 1898 1899 aio_context = bdrv_get_aio_context(state->bs); 1900 aio_context_acquire(aio_context); 1901 1902 assert(state->job); 1903 job_start(&state->job->job); 1904 1905 aio_context_release(aio_context); 1906 } 1907 1908 static void blockdev_backup_abort(BlkActionState *common) 1909 { 1910 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1911 1912 if (state->job) { 1913 AioContext *aio_context; 1914 1915 aio_context = bdrv_get_aio_context(state->bs); 1916 aio_context_acquire(aio_context); 1917 1918 job_cancel_sync(&state->job->job); 1919 1920 aio_context_release(aio_context); 1921 } 1922 } 1923 1924 static void blockdev_backup_clean(BlkActionState *common) 1925 { 1926 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1927 AioContext *aio_context; 1928 1929 if (!state->bs) { 1930 return; 1931 } 1932 1933 aio_context = bdrv_get_aio_context(state->bs); 1934 aio_context_acquire(aio_context); 1935 1936 bdrv_drained_end(state->bs); 1937 1938 aio_context_release(aio_context); 1939 } 1940 1941 typedef struct BlockDirtyBitmapState { 1942 BlkActionState common; 1943 BdrvDirtyBitmap *bitmap; 1944 BlockDriverState *bs; 1945 HBitmap *backup; 1946 bool prepared; 1947 bool was_enabled; 1948 } BlockDirtyBitmapState; 1949 1950 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1951 Error **errp) 1952 { 1953 Error *local_err = NULL; 1954 BlockDirtyBitmapAdd *action; 1955 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1956 common, common); 1957 1958 if (action_check_completion_mode(common, errp) < 0) { 1959 return; 1960 } 1961 1962 action = common->action->u.block_dirty_bitmap_add.data; 1963 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1964 qmp_block_dirty_bitmap_add(action->node, action->name, 1965 action->has_granularity, action->granularity, 1966 action->has_persistent, action->persistent, 1967 action->has_autoload, action->autoload, 1968 action->has_disabled, action->disabled, 1969 &local_err); 1970 1971 if (!local_err) { 1972 state->prepared = true; 1973 } else { 1974 error_propagate(errp, local_err); 1975 } 1976 } 1977 1978 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1979 { 1980 BlockDirtyBitmapAdd *action; 1981 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1982 common, common); 1983 1984 action = common->action->u.block_dirty_bitmap_add.data; 1985 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1986 * then the node reference and bitmap name must have been valid. 1987 */ 1988 if (state->prepared) { 1989 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1990 } 1991 } 1992 1993 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1994 Error **errp) 1995 { 1996 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1997 common, common); 1998 BlockDirtyBitmap *action; 1999 2000 if (action_check_completion_mode(common, errp) < 0) { 2001 return; 2002 } 2003 2004 action = common->action->u.block_dirty_bitmap_clear.data; 2005 state->bitmap = block_dirty_bitmap_lookup(action->node, 2006 action->name, 2007 &state->bs, 2008 errp); 2009 if (!state->bitmap) { 2010 return; 2011 } 2012 2013 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2014 return; 2015 } 2016 2017 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2018 } 2019 2020 static void block_dirty_bitmap_restore(BlkActionState *common) 2021 { 2022 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2023 common, common); 2024 2025 if (state->backup) { 2026 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2027 } 2028 } 2029 2030 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2031 { 2032 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2033 common, common); 2034 2035 hbitmap_free(state->backup); 2036 } 2037 2038 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2039 Error **errp) 2040 { 2041 BlockDirtyBitmap *action; 2042 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2043 common, common); 2044 2045 if (action_check_completion_mode(common, errp) < 0) { 2046 return; 2047 } 2048 2049 action = common->action->u.block_dirty_bitmap_enable.data; 2050 state->bitmap = block_dirty_bitmap_lookup(action->node, 2051 action->name, 2052 NULL, 2053 errp); 2054 if (!state->bitmap) { 2055 return; 2056 } 2057 2058 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2059 return; 2060 } 2061 2062 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2063 bdrv_enable_dirty_bitmap(state->bitmap); 2064 } 2065 2066 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2067 { 2068 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2069 common, common); 2070 2071 if (!state->was_enabled) { 2072 bdrv_disable_dirty_bitmap(state->bitmap); 2073 } 2074 } 2075 2076 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2077 Error **errp) 2078 { 2079 BlockDirtyBitmap *action; 2080 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2081 common, common); 2082 2083 if (action_check_completion_mode(common, errp) < 0) { 2084 return; 2085 } 2086 2087 action = common->action->u.block_dirty_bitmap_disable.data; 2088 state->bitmap = block_dirty_bitmap_lookup(action->node, 2089 action->name, 2090 NULL, 2091 errp); 2092 if (!state->bitmap) { 2093 return; 2094 } 2095 2096 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2097 return; 2098 } 2099 2100 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2101 bdrv_disable_dirty_bitmap(state->bitmap); 2102 } 2103 2104 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2105 { 2106 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2107 common, common); 2108 2109 if (state->was_enabled) { 2110 bdrv_enable_dirty_bitmap(state->bitmap); 2111 } 2112 } 2113 2114 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node, 2115 const char *target, 2116 strList *bitmaps, 2117 HBitmap **backup, 2118 Error **errp); 2119 2120 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2121 Error **errp) 2122 { 2123 BlockDirtyBitmapMerge *action; 2124 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2125 common, common); 2126 2127 if (action_check_completion_mode(common, errp) < 0) { 2128 return; 2129 } 2130 2131 action = common->action->u.block_dirty_bitmap_merge.data; 2132 2133 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2134 action->bitmaps, &state->backup, 2135 errp); 2136 } 2137 2138 static void abort_prepare(BlkActionState *common, Error **errp) 2139 { 2140 error_setg(errp, "Transaction aborted using Abort action"); 2141 } 2142 2143 static void abort_commit(BlkActionState *common) 2144 { 2145 g_assert_not_reached(); /* this action never succeeds */ 2146 } 2147 2148 static const BlkActionOps actions[] = { 2149 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2150 .instance_size = sizeof(ExternalSnapshotState), 2151 .prepare = external_snapshot_prepare, 2152 .commit = external_snapshot_commit, 2153 .abort = external_snapshot_abort, 2154 .clean = external_snapshot_clean, 2155 }, 2156 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2157 .instance_size = sizeof(ExternalSnapshotState), 2158 .prepare = external_snapshot_prepare, 2159 .commit = external_snapshot_commit, 2160 .abort = external_snapshot_abort, 2161 .clean = external_snapshot_clean, 2162 }, 2163 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2164 .instance_size = sizeof(DriveBackupState), 2165 .prepare = drive_backup_prepare, 2166 .commit = drive_backup_commit, 2167 .abort = drive_backup_abort, 2168 .clean = drive_backup_clean, 2169 }, 2170 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2171 .instance_size = sizeof(BlockdevBackupState), 2172 .prepare = blockdev_backup_prepare, 2173 .commit = blockdev_backup_commit, 2174 .abort = blockdev_backup_abort, 2175 .clean = blockdev_backup_clean, 2176 }, 2177 [TRANSACTION_ACTION_KIND_ABORT] = { 2178 .instance_size = sizeof(BlkActionState), 2179 .prepare = abort_prepare, 2180 .commit = abort_commit, 2181 }, 2182 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2183 .instance_size = sizeof(InternalSnapshotState), 2184 .prepare = internal_snapshot_prepare, 2185 .abort = internal_snapshot_abort, 2186 .clean = internal_snapshot_clean, 2187 }, 2188 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2189 .instance_size = sizeof(BlockDirtyBitmapState), 2190 .prepare = block_dirty_bitmap_add_prepare, 2191 .abort = block_dirty_bitmap_add_abort, 2192 }, 2193 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2194 .instance_size = sizeof(BlockDirtyBitmapState), 2195 .prepare = block_dirty_bitmap_clear_prepare, 2196 .commit = block_dirty_bitmap_free_backup, 2197 .abort = block_dirty_bitmap_restore, 2198 }, 2199 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2200 .instance_size = sizeof(BlockDirtyBitmapState), 2201 .prepare = block_dirty_bitmap_enable_prepare, 2202 .abort = block_dirty_bitmap_enable_abort, 2203 }, 2204 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2205 .instance_size = sizeof(BlockDirtyBitmapState), 2206 .prepare = block_dirty_bitmap_disable_prepare, 2207 .abort = block_dirty_bitmap_disable_abort, 2208 }, 2209 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2210 .instance_size = sizeof(BlockDirtyBitmapState), 2211 .prepare = block_dirty_bitmap_merge_prepare, 2212 .commit = block_dirty_bitmap_free_backup, 2213 .abort = block_dirty_bitmap_restore, 2214 }, 2215 /* Where are transactions for MIRROR, COMMIT and STREAM? 2216 * Although these blockjobs use transaction callbacks like the backup job, 2217 * these jobs do not necessarily adhere to transaction semantics. 2218 * These jobs may not fully undo all of their actions on abort, nor do they 2219 * necessarily work in transactions with more than one job in them. 2220 */ 2221 }; 2222 2223 /** 2224 * Allocate a TransactionProperties structure if necessary, and fill 2225 * that structure with desired defaults if they are unset. 2226 */ 2227 static TransactionProperties *get_transaction_properties( 2228 TransactionProperties *props) 2229 { 2230 if (!props) { 2231 props = g_new0(TransactionProperties, 1); 2232 } 2233 2234 if (!props->has_completion_mode) { 2235 props->has_completion_mode = true; 2236 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2237 } 2238 2239 return props; 2240 } 2241 2242 /* 2243 * 'Atomic' group operations. The operations are performed as a set, and if 2244 * any fail then we roll back all operations in the group. 2245 */ 2246 void qmp_transaction(TransactionActionList *dev_list, 2247 bool has_props, 2248 struct TransactionProperties *props, 2249 Error **errp) 2250 { 2251 TransactionActionList *dev_entry = dev_list; 2252 JobTxn *block_job_txn = NULL; 2253 BlkActionState *state, *next; 2254 Error *local_err = NULL; 2255 2256 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2257 QTAILQ_INIT(&snap_bdrv_states); 2258 2259 /* Does this transaction get canceled as a group on failure? 2260 * If not, we don't really need to make a JobTxn. 2261 */ 2262 props = get_transaction_properties(props); 2263 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2264 block_job_txn = job_txn_new(); 2265 } 2266 2267 /* drain all i/o before any operations */ 2268 bdrv_drain_all(); 2269 2270 /* We don't do anything in this loop that commits us to the operations */ 2271 while (NULL != dev_entry) { 2272 TransactionAction *dev_info = NULL; 2273 const BlkActionOps *ops; 2274 2275 dev_info = dev_entry->value; 2276 dev_entry = dev_entry->next; 2277 2278 assert(dev_info->type < ARRAY_SIZE(actions)); 2279 2280 ops = &actions[dev_info->type]; 2281 assert(ops->instance_size > 0); 2282 2283 state = g_malloc0(ops->instance_size); 2284 state->ops = ops; 2285 state->action = dev_info; 2286 state->block_job_txn = block_job_txn; 2287 state->txn_props = props; 2288 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2289 2290 state->ops->prepare(state, &local_err); 2291 if (local_err) { 2292 error_propagate(errp, local_err); 2293 goto delete_and_fail; 2294 } 2295 } 2296 2297 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2298 if (state->ops->commit) { 2299 state->ops->commit(state); 2300 } 2301 } 2302 2303 /* success */ 2304 goto exit; 2305 2306 delete_and_fail: 2307 /* failure, and it is all-or-none; roll back all operations */ 2308 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2309 if (state->ops->abort) { 2310 state->ops->abort(state); 2311 } 2312 } 2313 exit: 2314 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2315 if (state->ops->clean) { 2316 state->ops->clean(state); 2317 } 2318 g_free(state); 2319 } 2320 if (!has_props) { 2321 qapi_free_TransactionProperties(props); 2322 } 2323 job_txn_unref(block_job_txn); 2324 } 2325 2326 void qmp_eject(bool has_device, const char *device, 2327 bool has_id, const char *id, 2328 bool has_force, bool force, Error **errp) 2329 { 2330 Error *local_err = NULL; 2331 int rc; 2332 2333 if (!has_force) { 2334 force = false; 2335 } 2336 2337 rc = do_open_tray(has_device ? device : NULL, 2338 has_id ? id : NULL, 2339 force, &local_err); 2340 if (rc && rc != -ENOSYS) { 2341 error_propagate(errp, local_err); 2342 return; 2343 } 2344 error_free(local_err); 2345 2346 blockdev_remove_medium(has_device, device, has_id, id, errp); 2347 } 2348 2349 void qmp_block_passwd(bool has_device, const char *device, 2350 bool has_node_name, const char *node_name, 2351 const char *password, Error **errp) 2352 { 2353 error_setg(errp, 2354 "Setting block passwords directly is no longer supported"); 2355 } 2356 2357 /* 2358 * Attempt to open the tray of @device. 2359 * If @force, ignore its tray lock. 2360 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2361 * On error, store an error through @errp and return -errno. 2362 * If @device does not exist, return -ENODEV. 2363 * If it has no removable media, return -ENOTSUP. 2364 * If it has no tray, return -ENOSYS. 2365 * If the guest was asked to open the tray, return -EINPROGRESS. 2366 * Else, return 0. 2367 */ 2368 static int do_open_tray(const char *blk_name, const char *qdev_id, 2369 bool force, Error **errp) 2370 { 2371 BlockBackend *blk; 2372 const char *device = qdev_id ?: blk_name; 2373 bool locked; 2374 2375 blk = qmp_get_blk(blk_name, qdev_id, errp); 2376 if (!blk) { 2377 return -ENODEV; 2378 } 2379 2380 if (!blk_dev_has_removable_media(blk)) { 2381 error_setg(errp, "Device '%s' is not removable", device); 2382 return -ENOTSUP; 2383 } 2384 2385 if (!blk_dev_has_tray(blk)) { 2386 error_setg(errp, "Device '%s' does not have a tray", device); 2387 return -ENOSYS; 2388 } 2389 2390 if (blk_dev_is_tray_open(blk)) { 2391 return 0; 2392 } 2393 2394 locked = blk_dev_is_medium_locked(blk); 2395 if (locked) { 2396 blk_dev_eject_request(blk, force); 2397 } 2398 2399 if (!locked || force) { 2400 blk_dev_change_media_cb(blk, false, &error_abort); 2401 } 2402 2403 if (locked && !force) { 2404 error_setg(errp, "Device '%s' is locked and force was not specified, " 2405 "wait for tray to open and try again", device); 2406 return -EINPROGRESS; 2407 } 2408 2409 return 0; 2410 } 2411 2412 void qmp_blockdev_open_tray(bool has_device, const char *device, 2413 bool has_id, const char *id, 2414 bool has_force, bool force, 2415 Error **errp) 2416 { 2417 Error *local_err = NULL; 2418 int rc; 2419 2420 if (!has_force) { 2421 force = false; 2422 } 2423 rc = do_open_tray(has_device ? device : NULL, 2424 has_id ? id : NULL, 2425 force, &local_err); 2426 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2427 error_propagate(errp, local_err); 2428 return; 2429 } 2430 error_free(local_err); 2431 } 2432 2433 void qmp_blockdev_close_tray(bool has_device, const char *device, 2434 bool has_id, const char *id, 2435 Error **errp) 2436 { 2437 BlockBackend *blk; 2438 Error *local_err = NULL; 2439 2440 device = has_device ? device : NULL; 2441 id = has_id ? id : NULL; 2442 2443 blk = qmp_get_blk(device, id, errp); 2444 if (!blk) { 2445 return; 2446 } 2447 2448 if (!blk_dev_has_removable_media(blk)) { 2449 error_setg(errp, "Device '%s' is not removable", device ?: id); 2450 return; 2451 } 2452 2453 if (!blk_dev_has_tray(blk)) { 2454 /* Ignore this command on tray-less devices */ 2455 return; 2456 } 2457 2458 if (!blk_dev_is_tray_open(blk)) { 2459 return; 2460 } 2461 2462 blk_dev_change_media_cb(blk, true, &local_err); 2463 if (local_err) { 2464 error_propagate(errp, local_err); 2465 return; 2466 } 2467 } 2468 2469 static void blockdev_remove_medium(bool has_device, const char *device, 2470 bool has_id, const char *id, Error **errp) 2471 { 2472 BlockBackend *blk; 2473 BlockDriverState *bs; 2474 AioContext *aio_context; 2475 bool has_attached_device; 2476 2477 device = has_device ? device : NULL; 2478 id = has_id ? id : NULL; 2479 2480 blk = qmp_get_blk(device, id, errp); 2481 if (!blk) { 2482 return; 2483 } 2484 2485 /* For BBs without a device, we can exchange the BDS tree at will */ 2486 has_attached_device = blk_get_attached_dev(blk); 2487 2488 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2489 error_setg(errp, "Device '%s' is not removable", device ?: id); 2490 return; 2491 } 2492 2493 if (has_attached_device && blk_dev_has_tray(blk) && 2494 !blk_dev_is_tray_open(blk)) 2495 { 2496 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2497 return; 2498 } 2499 2500 bs = blk_bs(blk); 2501 if (!bs) { 2502 return; 2503 } 2504 2505 aio_context = bdrv_get_aio_context(bs); 2506 aio_context_acquire(aio_context); 2507 2508 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2509 goto out; 2510 } 2511 2512 blk_remove_bs(blk); 2513 2514 if (!blk_dev_has_tray(blk)) { 2515 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2516 * called at all); therefore, the medium needs to be ejected here. 2517 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2518 * value passed here (i.e. false). */ 2519 blk_dev_change_media_cb(blk, false, &error_abort); 2520 } 2521 2522 out: 2523 aio_context_release(aio_context); 2524 } 2525 2526 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2527 { 2528 blockdev_remove_medium(false, NULL, true, id, errp); 2529 } 2530 2531 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2532 BlockDriverState *bs, Error **errp) 2533 { 2534 Error *local_err = NULL; 2535 bool has_device; 2536 int ret; 2537 2538 /* For BBs without a device, we can exchange the BDS tree at will */ 2539 has_device = blk_get_attached_dev(blk); 2540 2541 if (has_device && !blk_dev_has_removable_media(blk)) { 2542 error_setg(errp, "Device is not removable"); 2543 return; 2544 } 2545 2546 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2547 error_setg(errp, "Tray of the device is not open"); 2548 return; 2549 } 2550 2551 if (blk_bs(blk)) { 2552 error_setg(errp, "There already is a medium in the device"); 2553 return; 2554 } 2555 2556 ret = blk_insert_bs(blk, bs, errp); 2557 if (ret < 0) { 2558 return; 2559 } 2560 2561 if (!blk_dev_has_tray(blk)) { 2562 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2563 * called at all); therefore, the medium needs to be pushed into the 2564 * slot here. 2565 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2566 * value passed here (i.e. true). */ 2567 blk_dev_change_media_cb(blk, true, &local_err); 2568 if (local_err) { 2569 error_propagate(errp, local_err); 2570 blk_remove_bs(blk); 2571 return; 2572 } 2573 } 2574 } 2575 2576 static void blockdev_insert_medium(bool has_device, const char *device, 2577 bool has_id, const char *id, 2578 const char *node_name, Error **errp) 2579 { 2580 BlockBackend *blk; 2581 BlockDriverState *bs; 2582 2583 blk = qmp_get_blk(has_device ? device : NULL, 2584 has_id ? id : NULL, 2585 errp); 2586 if (!blk) { 2587 return; 2588 } 2589 2590 bs = bdrv_find_node(node_name); 2591 if (!bs) { 2592 error_setg(errp, "Node '%s' not found", node_name); 2593 return; 2594 } 2595 2596 if (bdrv_has_blk(bs)) { 2597 error_setg(errp, "Node '%s' is already in use", node_name); 2598 return; 2599 } 2600 2601 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2602 } 2603 2604 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2605 Error **errp) 2606 { 2607 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2608 } 2609 2610 void qmp_blockdev_change_medium(bool has_device, const char *device, 2611 bool has_id, const char *id, 2612 const char *filename, 2613 bool has_format, const char *format, 2614 bool has_read_only, 2615 BlockdevChangeReadOnlyMode read_only, 2616 Error **errp) 2617 { 2618 BlockBackend *blk; 2619 BlockDriverState *medium_bs = NULL; 2620 int bdrv_flags; 2621 bool detect_zeroes; 2622 int rc; 2623 QDict *options = NULL; 2624 Error *err = NULL; 2625 2626 blk = qmp_get_blk(has_device ? device : NULL, 2627 has_id ? id : NULL, 2628 errp); 2629 if (!blk) { 2630 goto fail; 2631 } 2632 2633 if (blk_bs(blk)) { 2634 blk_update_root_state(blk); 2635 } 2636 2637 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2638 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2639 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2640 2641 if (!has_read_only) { 2642 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2643 } 2644 2645 switch (read_only) { 2646 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2647 break; 2648 2649 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2650 bdrv_flags &= ~BDRV_O_RDWR; 2651 break; 2652 2653 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2654 bdrv_flags |= BDRV_O_RDWR; 2655 break; 2656 2657 default: 2658 abort(); 2659 } 2660 2661 options = qdict_new(); 2662 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2663 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2664 2665 if (has_format) { 2666 qdict_put_str(options, "driver", format); 2667 } 2668 2669 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2670 if (!medium_bs) { 2671 goto fail; 2672 } 2673 2674 rc = do_open_tray(has_device ? device : NULL, 2675 has_id ? id : NULL, 2676 false, &err); 2677 if (rc && rc != -ENOSYS) { 2678 error_propagate(errp, err); 2679 goto fail; 2680 } 2681 error_free(err); 2682 err = NULL; 2683 2684 blockdev_remove_medium(has_device, device, has_id, id, &err); 2685 if (err) { 2686 error_propagate(errp, err); 2687 goto fail; 2688 } 2689 2690 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2691 if (err) { 2692 error_propagate(errp, err); 2693 goto fail; 2694 } 2695 2696 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2697 2698 fail: 2699 /* If the medium has been inserted, the device has its own reference, so 2700 * ours must be relinquished; and if it has not been inserted successfully, 2701 * the reference must be relinquished anyway */ 2702 bdrv_unref(medium_bs); 2703 } 2704 2705 /* throttling disk I/O limits */ 2706 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2707 { 2708 ThrottleConfig cfg; 2709 BlockDriverState *bs; 2710 BlockBackend *blk; 2711 AioContext *aio_context; 2712 2713 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2714 arg->has_id ? arg->id : NULL, 2715 errp); 2716 if (!blk) { 2717 return; 2718 } 2719 2720 aio_context = blk_get_aio_context(blk); 2721 aio_context_acquire(aio_context); 2722 2723 bs = blk_bs(blk); 2724 if (!bs) { 2725 error_setg(errp, "Device has no medium"); 2726 goto out; 2727 } 2728 2729 throttle_config_init(&cfg); 2730 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2731 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2732 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2733 2734 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2735 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2736 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2737 2738 if (arg->has_bps_max) { 2739 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2740 } 2741 if (arg->has_bps_rd_max) { 2742 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2743 } 2744 if (arg->has_bps_wr_max) { 2745 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2746 } 2747 if (arg->has_iops_max) { 2748 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2749 } 2750 if (arg->has_iops_rd_max) { 2751 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2752 } 2753 if (arg->has_iops_wr_max) { 2754 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2755 } 2756 2757 if (arg->has_bps_max_length) { 2758 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2759 } 2760 if (arg->has_bps_rd_max_length) { 2761 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2762 } 2763 if (arg->has_bps_wr_max_length) { 2764 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2765 } 2766 if (arg->has_iops_max_length) { 2767 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2768 } 2769 if (arg->has_iops_rd_max_length) { 2770 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2771 } 2772 if (arg->has_iops_wr_max_length) { 2773 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2774 } 2775 2776 if (arg->has_iops_size) { 2777 cfg.op_size = arg->iops_size; 2778 } 2779 2780 if (!throttle_is_valid(&cfg, errp)) { 2781 goto out; 2782 } 2783 2784 if (throttle_enabled(&cfg)) { 2785 /* Enable I/O limits if they're not enabled yet, otherwise 2786 * just update the throttling group. */ 2787 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2788 blk_io_limits_enable(blk, 2789 arg->has_group ? arg->group : 2790 arg->has_device ? arg->device : 2791 arg->id); 2792 } else if (arg->has_group) { 2793 blk_io_limits_update_group(blk, arg->group); 2794 } 2795 /* Set the new throttling configuration */ 2796 blk_set_io_limits(blk, &cfg); 2797 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2798 /* If all throttling settings are set to 0, disable I/O limits */ 2799 blk_io_limits_disable(blk); 2800 } 2801 2802 out: 2803 aio_context_release(aio_context); 2804 } 2805 2806 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2807 bool has_granularity, uint32_t granularity, 2808 bool has_persistent, bool persistent, 2809 bool has_autoload, bool autoload, 2810 bool has_disabled, bool disabled, 2811 Error **errp) 2812 { 2813 BlockDriverState *bs; 2814 BdrvDirtyBitmap *bitmap; 2815 AioContext *aio_context = NULL; 2816 2817 if (!name || name[0] == '\0') { 2818 error_setg(errp, "Bitmap name cannot be empty"); 2819 return; 2820 } 2821 2822 bs = bdrv_lookup_bs(node, node, errp); 2823 if (!bs) { 2824 return; 2825 } 2826 2827 if (has_granularity) { 2828 if (granularity < 512 || !is_power_of_2(granularity)) { 2829 error_setg(errp, "Granularity must be power of 2 " 2830 "and at least 512"); 2831 return; 2832 } 2833 } else { 2834 /* Default to cluster size, if available: */ 2835 granularity = bdrv_get_default_bitmap_granularity(bs); 2836 } 2837 2838 if (!has_persistent) { 2839 persistent = false; 2840 } 2841 2842 if (has_autoload) { 2843 warn_report("Autoload option is deprecated and its value is ignored"); 2844 } 2845 2846 if (!has_disabled) { 2847 disabled = false; 2848 } 2849 2850 if (persistent) { 2851 aio_context = bdrv_get_aio_context(bs); 2852 aio_context_acquire(aio_context); 2853 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2854 goto out; 2855 } 2856 } 2857 2858 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2859 if (bitmap == NULL) { 2860 goto out; 2861 } 2862 2863 if (disabled) { 2864 bdrv_disable_dirty_bitmap(bitmap); 2865 } 2866 2867 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2868 out: 2869 if (aio_context) { 2870 aio_context_release(aio_context); 2871 } 2872 } 2873 2874 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2875 Error **errp) 2876 { 2877 BlockDriverState *bs; 2878 BdrvDirtyBitmap *bitmap; 2879 Error *local_err = NULL; 2880 AioContext *aio_context = NULL; 2881 2882 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2883 if (!bitmap || !bs) { 2884 return; 2885 } 2886 2887 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2888 errp)) { 2889 return; 2890 } 2891 2892 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2893 aio_context = bdrv_get_aio_context(bs); 2894 aio_context_acquire(aio_context); 2895 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2896 if (local_err != NULL) { 2897 error_propagate(errp, local_err); 2898 goto out; 2899 } 2900 } 2901 2902 bdrv_release_dirty_bitmap(bs, bitmap); 2903 out: 2904 if (aio_context) { 2905 aio_context_release(aio_context); 2906 } 2907 } 2908 2909 /** 2910 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2911 * immediately after a full backup operation. 2912 */ 2913 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2914 Error **errp) 2915 { 2916 BdrvDirtyBitmap *bitmap; 2917 BlockDriverState *bs; 2918 2919 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2920 if (!bitmap || !bs) { 2921 return; 2922 } 2923 2924 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2925 return; 2926 } 2927 2928 bdrv_clear_dirty_bitmap(bitmap, NULL); 2929 } 2930 2931 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2932 Error **errp) 2933 { 2934 BlockDriverState *bs; 2935 BdrvDirtyBitmap *bitmap; 2936 2937 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2938 if (!bitmap) { 2939 return; 2940 } 2941 2942 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2943 return; 2944 } 2945 2946 bdrv_enable_dirty_bitmap(bitmap); 2947 } 2948 2949 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2950 Error **errp) 2951 { 2952 BlockDriverState *bs; 2953 BdrvDirtyBitmap *bitmap; 2954 2955 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2956 if (!bitmap) { 2957 return; 2958 } 2959 2960 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2961 return; 2962 } 2963 2964 bdrv_disable_dirty_bitmap(bitmap); 2965 } 2966 2967 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node, 2968 const char *target, 2969 strList *bitmaps, 2970 HBitmap **backup, 2971 Error **errp) 2972 { 2973 BlockDriverState *bs; 2974 BdrvDirtyBitmap *dst, *src, *anon; 2975 strList *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 src = bdrv_find_dirty_bitmap(bs, lst->value); 2991 if (!src) { 2992 error_setg(errp, "Dirty bitmap '%s' not found", lst->value); 2993 dst = NULL; 2994 goto out; 2995 } 2996 2997 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 2998 if (local_err) { 2999 error_propagate(errp, local_err); 3000 dst = NULL; 3001 goto out; 3002 } 3003 } 3004 3005 /* Merge into dst; dst is unchanged on failure. */ 3006 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3007 3008 out: 3009 bdrv_release_dirty_bitmap(bs, anon); 3010 return dst; 3011 } 3012 3013 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3014 strList *bitmaps, Error **errp) 3015 { 3016 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3017 } 3018 3019 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3020 const char *name, 3021 Error **errp) 3022 { 3023 BdrvDirtyBitmap *bitmap; 3024 BlockDriverState *bs; 3025 BlockDirtyBitmapSha256 *ret = NULL; 3026 char *sha256; 3027 3028 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3029 if (!bitmap || !bs) { 3030 return NULL; 3031 } 3032 3033 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3034 if (sha256 == NULL) { 3035 return NULL; 3036 } 3037 3038 ret = g_new(BlockDirtyBitmapSha256, 1); 3039 ret->sha256 = sha256; 3040 3041 return ret; 3042 } 3043 3044 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3045 { 3046 const char *id = qdict_get_str(qdict, "id"); 3047 BlockBackend *blk; 3048 BlockDriverState *bs; 3049 AioContext *aio_context; 3050 Error *local_err = NULL; 3051 3052 bs = bdrv_find_node(id); 3053 if (bs) { 3054 qmp_blockdev_del(id, &local_err); 3055 if (local_err) { 3056 error_report_err(local_err); 3057 } 3058 return; 3059 } 3060 3061 blk = blk_by_name(id); 3062 if (!blk) { 3063 error_report("Device '%s' not found", id); 3064 return; 3065 } 3066 3067 if (!blk_legacy_dinfo(blk)) { 3068 error_report("Deleting device added with blockdev-add" 3069 " is not supported"); 3070 return; 3071 } 3072 3073 aio_context = blk_get_aio_context(blk); 3074 aio_context_acquire(aio_context); 3075 3076 bs = blk_bs(blk); 3077 if (bs) { 3078 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3079 error_report_err(local_err); 3080 aio_context_release(aio_context); 3081 return; 3082 } 3083 3084 blk_remove_bs(blk); 3085 } 3086 3087 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3088 monitor_remove_blk(blk); 3089 3090 /* If this BlockBackend has a device attached to it, its refcount will be 3091 * decremented when the device is removed; otherwise we have to do so here. 3092 */ 3093 if (blk_get_attached_dev(blk)) { 3094 /* Further I/O must not pause the guest */ 3095 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3096 BLOCKDEV_ON_ERROR_REPORT); 3097 } else { 3098 blk_unref(blk); 3099 } 3100 3101 aio_context_release(aio_context); 3102 } 3103 3104 void qmp_block_resize(bool has_device, const char *device, 3105 bool has_node_name, const char *node_name, 3106 int64_t size, Error **errp) 3107 { 3108 Error *local_err = NULL; 3109 BlockBackend *blk = NULL; 3110 BlockDriverState *bs; 3111 AioContext *aio_context; 3112 int ret; 3113 3114 bs = bdrv_lookup_bs(has_device ? device : NULL, 3115 has_node_name ? node_name : NULL, 3116 &local_err); 3117 if (local_err) { 3118 error_propagate(errp, local_err); 3119 return; 3120 } 3121 3122 aio_context = bdrv_get_aio_context(bs); 3123 aio_context_acquire(aio_context); 3124 3125 if (!bdrv_is_first_non_filter(bs)) { 3126 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3127 goto out; 3128 } 3129 3130 if (size < 0) { 3131 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3132 goto out; 3133 } 3134 3135 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3136 error_setg(errp, QERR_DEVICE_IN_USE, device); 3137 goto out; 3138 } 3139 3140 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3141 ret = blk_insert_bs(blk, bs, errp); 3142 if (ret < 0) { 3143 goto out; 3144 } 3145 3146 bdrv_drained_begin(bs); 3147 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3148 bdrv_drained_end(bs); 3149 3150 out: 3151 blk_unref(blk); 3152 aio_context_release(aio_context); 3153 } 3154 3155 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3156 bool has_base, const char *base, 3157 bool has_base_node, const char *base_node, 3158 bool has_backing_file, const char *backing_file, 3159 bool has_speed, int64_t speed, 3160 bool has_on_error, BlockdevOnError on_error, 3161 bool has_auto_finalize, bool auto_finalize, 3162 bool has_auto_dismiss, bool auto_dismiss, 3163 Error **errp) 3164 { 3165 BlockDriverState *bs, *iter; 3166 BlockDriverState *base_bs = NULL; 3167 AioContext *aio_context; 3168 Error *local_err = NULL; 3169 const char *base_name = NULL; 3170 int job_flags = JOB_DEFAULT; 3171 3172 if (!has_on_error) { 3173 on_error = BLOCKDEV_ON_ERROR_REPORT; 3174 } 3175 3176 bs = bdrv_lookup_bs(device, device, errp); 3177 if (!bs) { 3178 return; 3179 } 3180 3181 aio_context = bdrv_get_aio_context(bs); 3182 aio_context_acquire(aio_context); 3183 3184 if (has_base && has_base_node) { 3185 error_setg(errp, "'base' and 'base-node' cannot be specified " 3186 "at the same time"); 3187 goto out; 3188 } 3189 3190 if (has_base) { 3191 base_bs = bdrv_find_backing_image(bs, base); 3192 if (base_bs == NULL) { 3193 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3194 goto out; 3195 } 3196 assert(bdrv_get_aio_context(base_bs) == aio_context); 3197 base_name = base; 3198 } 3199 3200 if (has_base_node) { 3201 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3202 if (!base_bs) { 3203 goto out; 3204 } 3205 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3206 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3207 base_node, device); 3208 goto out; 3209 } 3210 assert(bdrv_get_aio_context(base_bs) == aio_context); 3211 bdrv_refresh_filename(base_bs); 3212 base_name = base_bs->filename; 3213 } 3214 3215 /* Check for op blockers in the whole chain between bs and base */ 3216 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3217 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3218 goto out; 3219 } 3220 } 3221 3222 /* if we are streaming the entire chain, the result will have no backing 3223 * file, and specifying one is therefore an error */ 3224 if (base_bs == NULL && has_backing_file) { 3225 error_setg(errp, "backing file specified, but streaming the " 3226 "entire chain"); 3227 goto out; 3228 } 3229 3230 /* backing_file string overrides base bs filename */ 3231 base_name = has_backing_file ? backing_file : base_name; 3232 3233 if (has_auto_finalize && !auto_finalize) { 3234 job_flags |= JOB_MANUAL_FINALIZE; 3235 } 3236 if (has_auto_dismiss && !auto_dismiss) { 3237 job_flags |= JOB_MANUAL_DISMISS; 3238 } 3239 3240 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3241 job_flags, has_speed ? speed : 0, on_error, &local_err); 3242 if (local_err) { 3243 error_propagate(errp, local_err); 3244 goto out; 3245 } 3246 3247 trace_qmp_block_stream(bs, bs->job); 3248 3249 out: 3250 aio_context_release(aio_context); 3251 } 3252 3253 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3254 bool has_base_node, const char *base_node, 3255 bool has_base, const char *base, 3256 bool has_top_node, const char *top_node, 3257 bool has_top, const char *top, 3258 bool has_backing_file, const char *backing_file, 3259 bool has_speed, int64_t speed, 3260 bool has_filter_node_name, const char *filter_node_name, 3261 bool has_auto_finalize, bool auto_finalize, 3262 bool has_auto_dismiss, bool auto_dismiss, 3263 Error **errp) 3264 { 3265 BlockDriverState *bs; 3266 BlockDriverState *iter; 3267 BlockDriverState *base_bs, *top_bs; 3268 AioContext *aio_context; 3269 Error *local_err = NULL; 3270 /* This will be part of the QMP command, if/when the 3271 * BlockdevOnError change for blkmirror makes it in 3272 */ 3273 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3274 int job_flags = JOB_DEFAULT; 3275 3276 if (!has_speed) { 3277 speed = 0; 3278 } 3279 if (!has_filter_node_name) { 3280 filter_node_name = NULL; 3281 } 3282 if (has_auto_finalize && !auto_finalize) { 3283 job_flags |= JOB_MANUAL_FINALIZE; 3284 } 3285 if (has_auto_dismiss && !auto_dismiss) { 3286 job_flags |= JOB_MANUAL_DISMISS; 3287 } 3288 3289 /* Important Note: 3290 * libvirt relies on the DeviceNotFound error class in order to probe for 3291 * live commit feature versions; for this to work, we must make sure to 3292 * perform the device lookup before any generic errors that may occur in a 3293 * scenario in which all optional arguments are omitted. */ 3294 bs = qmp_get_root_bs(device, &local_err); 3295 if (!bs) { 3296 bs = bdrv_lookup_bs(device, device, NULL); 3297 if (!bs) { 3298 error_free(local_err); 3299 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3300 "Device '%s' not found", device); 3301 } else { 3302 error_propagate(errp, local_err); 3303 } 3304 return; 3305 } 3306 3307 aio_context = bdrv_get_aio_context(bs); 3308 aio_context_acquire(aio_context); 3309 3310 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3311 goto out; 3312 } 3313 3314 /* default top_bs is the active layer */ 3315 top_bs = bs; 3316 3317 if (has_top_node && has_top) { 3318 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3319 goto out; 3320 } else if (has_top_node) { 3321 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3322 if (top_bs == NULL) { 3323 goto out; 3324 } 3325 if (!bdrv_chain_contains(bs, top_bs)) { 3326 error_setg(errp, "'%s' is not in this backing file chain", 3327 top_node); 3328 goto out; 3329 } 3330 } else if (has_top && top) { 3331 /* This strcmp() is just a shortcut, there is no need to 3332 * refresh @bs's filename. If it mismatches, 3333 * bdrv_find_backing_image() will do the refresh and may still 3334 * return @bs. */ 3335 if (strcmp(bs->filename, top) != 0) { 3336 top_bs = bdrv_find_backing_image(bs, top); 3337 } 3338 } 3339 3340 if (top_bs == NULL) { 3341 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3342 goto out; 3343 } 3344 3345 assert(bdrv_get_aio_context(top_bs) == aio_context); 3346 3347 if (has_base_node && has_base) { 3348 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3349 goto out; 3350 } else if (has_base_node) { 3351 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3352 if (base_bs == NULL) { 3353 goto out; 3354 } 3355 if (!bdrv_chain_contains(top_bs, base_bs)) { 3356 error_setg(errp, "'%s' is not in this backing file chain", 3357 base_node); 3358 goto out; 3359 } 3360 } else if (has_base && base) { 3361 base_bs = bdrv_find_backing_image(top_bs, base); 3362 } else { 3363 base_bs = bdrv_find_base(top_bs); 3364 } 3365 3366 if (base_bs == NULL) { 3367 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3368 goto out; 3369 } 3370 3371 assert(bdrv_get_aio_context(base_bs) == aio_context); 3372 3373 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3374 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3375 goto out; 3376 } 3377 } 3378 3379 /* Do not allow attempts to commit an image into itself */ 3380 if (top_bs == base_bs) { 3381 error_setg(errp, "cannot commit an image into itself"); 3382 goto out; 3383 } 3384 3385 if (top_bs == bs) { 3386 if (has_backing_file) { 3387 error_setg(errp, "'backing-file' specified," 3388 " but 'top' is the active layer"); 3389 goto out; 3390 } 3391 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3392 job_flags, speed, on_error, 3393 filter_node_name, NULL, NULL, false, &local_err); 3394 } else { 3395 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3396 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3397 goto out; 3398 } 3399 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3400 speed, on_error, has_backing_file ? backing_file : NULL, 3401 filter_node_name, &local_err); 3402 } 3403 if (local_err != NULL) { 3404 error_propagate(errp, local_err); 3405 goto out; 3406 } 3407 3408 out: 3409 aio_context_release(aio_context); 3410 } 3411 3412 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3413 Error **errp) 3414 { 3415 BlockDriverState *bs; 3416 BlockDriverState *target_bs; 3417 BlockDriverState *source = NULL; 3418 BlockJob *job = NULL; 3419 BdrvDirtyBitmap *bmap = NULL; 3420 AioContext *aio_context; 3421 QDict *options = NULL; 3422 Error *local_err = NULL; 3423 int flags, job_flags = JOB_DEFAULT; 3424 int64_t size; 3425 bool set_backing_hd = false; 3426 3427 if (!backup->has_speed) { 3428 backup->speed = 0; 3429 } 3430 if (!backup->has_on_source_error) { 3431 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3432 } 3433 if (!backup->has_on_target_error) { 3434 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3435 } 3436 if (!backup->has_mode) { 3437 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3438 } 3439 if (!backup->has_job_id) { 3440 backup->job_id = NULL; 3441 } 3442 if (!backup->has_auto_finalize) { 3443 backup->auto_finalize = true; 3444 } 3445 if (!backup->has_auto_dismiss) { 3446 backup->auto_dismiss = true; 3447 } 3448 if (!backup->has_compress) { 3449 backup->compress = false; 3450 } 3451 3452 bs = qmp_get_root_bs(backup->device, errp); 3453 if (!bs) { 3454 return NULL; 3455 } 3456 3457 aio_context = bdrv_get_aio_context(bs); 3458 aio_context_acquire(aio_context); 3459 3460 if (!backup->has_format) { 3461 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3462 NULL : (char*) bs->drv->format_name; 3463 } 3464 3465 /* Early check to avoid creating target */ 3466 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3467 goto out; 3468 } 3469 3470 flags = bs->open_flags | BDRV_O_RDWR; 3471 3472 /* See if we have a backing HD we can use to create our new image 3473 * on top of. */ 3474 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3475 source = backing_bs(bs); 3476 if (!source) { 3477 backup->sync = MIRROR_SYNC_MODE_FULL; 3478 } 3479 } 3480 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3481 source = bs; 3482 flags |= BDRV_O_NO_BACKING; 3483 set_backing_hd = true; 3484 } 3485 3486 size = bdrv_getlength(bs); 3487 if (size < 0) { 3488 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3489 goto out; 3490 } 3491 3492 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3493 assert(backup->format); 3494 if (source) { 3495 bdrv_refresh_filename(source); 3496 bdrv_img_create(backup->target, backup->format, source->filename, 3497 source->drv->format_name, NULL, 3498 size, flags, false, &local_err); 3499 } else { 3500 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3501 size, flags, false, &local_err); 3502 } 3503 } 3504 3505 if (local_err) { 3506 error_propagate(errp, local_err); 3507 goto out; 3508 } 3509 3510 if (backup->format) { 3511 if (!options) { 3512 options = qdict_new(); 3513 } 3514 qdict_put_str(options, "driver", backup->format); 3515 } 3516 3517 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3518 if (!target_bs) { 3519 goto out; 3520 } 3521 3522 bdrv_set_aio_context(target_bs, aio_context); 3523 3524 if (set_backing_hd) { 3525 bdrv_set_backing_hd(target_bs, source, &local_err); 3526 if (local_err) { 3527 bdrv_unref(target_bs); 3528 goto out; 3529 } 3530 } 3531 3532 if (backup->has_bitmap) { 3533 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3534 if (!bmap) { 3535 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3536 bdrv_unref(target_bs); 3537 goto out; 3538 } 3539 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3540 goto out; 3541 } 3542 } 3543 if (!backup->auto_finalize) { 3544 job_flags |= JOB_MANUAL_FINALIZE; 3545 } 3546 if (!backup->auto_dismiss) { 3547 job_flags |= JOB_MANUAL_DISMISS; 3548 } 3549 3550 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3551 backup->sync, bmap, backup->compress, 3552 backup->on_source_error, backup->on_target_error, 3553 job_flags, NULL, NULL, txn, &local_err); 3554 bdrv_unref(target_bs); 3555 if (local_err != NULL) { 3556 error_propagate(errp, local_err); 3557 goto out; 3558 } 3559 3560 out: 3561 aio_context_release(aio_context); 3562 return job; 3563 } 3564 3565 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3566 { 3567 3568 BlockJob *job; 3569 job = do_drive_backup(arg, NULL, errp); 3570 if (job) { 3571 job_start(&job->job); 3572 } 3573 } 3574 3575 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3576 { 3577 return bdrv_named_nodes_list(errp); 3578 } 3579 3580 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3581 { 3582 return bdrv_get_xdbg_block_graph(errp); 3583 } 3584 3585 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3586 Error **errp) 3587 { 3588 BlockDriverState *bs; 3589 BlockDriverState *target_bs; 3590 Error *local_err = NULL; 3591 BdrvDirtyBitmap *bmap = NULL; 3592 AioContext *aio_context; 3593 BlockJob *job = NULL; 3594 int job_flags = JOB_DEFAULT; 3595 3596 if (!backup->has_speed) { 3597 backup->speed = 0; 3598 } 3599 if (!backup->has_on_source_error) { 3600 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3601 } 3602 if (!backup->has_on_target_error) { 3603 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3604 } 3605 if (!backup->has_job_id) { 3606 backup->job_id = NULL; 3607 } 3608 if (!backup->has_auto_finalize) { 3609 backup->auto_finalize = true; 3610 } 3611 if (!backup->has_auto_dismiss) { 3612 backup->auto_dismiss = true; 3613 } 3614 if (!backup->has_compress) { 3615 backup->compress = false; 3616 } 3617 3618 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3619 if (!bs) { 3620 return NULL; 3621 } 3622 3623 aio_context = bdrv_get_aio_context(bs); 3624 aio_context_acquire(aio_context); 3625 3626 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3627 if (!target_bs) { 3628 goto out; 3629 } 3630 3631 if (bdrv_get_aio_context(target_bs) != aio_context) { 3632 if (!bdrv_has_blk(target_bs)) { 3633 /* The target BDS is not attached, we can safely move it to another 3634 * AioContext. */ 3635 bdrv_set_aio_context(target_bs, aio_context); 3636 } else { 3637 error_setg(errp, "Target is attached to a different thread from " 3638 "source."); 3639 goto out; 3640 } 3641 } 3642 3643 if (backup->has_bitmap) { 3644 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3645 if (!bmap) { 3646 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3647 goto out; 3648 } 3649 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3650 goto out; 3651 } 3652 } 3653 3654 if (!backup->auto_finalize) { 3655 job_flags |= JOB_MANUAL_FINALIZE; 3656 } 3657 if (!backup->auto_dismiss) { 3658 job_flags |= JOB_MANUAL_DISMISS; 3659 } 3660 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3661 backup->sync, bmap, backup->compress, 3662 backup->on_source_error, backup->on_target_error, 3663 job_flags, NULL, NULL, txn, &local_err); 3664 if (local_err != NULL) { 3665 error_propagate(errp, local_err); 3666 } 3667 out: 3668 aio_context_release(aio_context); 3669 return job; 3670 } 3671 3672 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3673 { 3674 BlockJob *job; 3675 job = do_blockdev_backup(arg, NULL, errp); 3676 if (job) { 3677 job_start(&job->job); 3678 } 3679 } 3680 3681 /* Parameter check and block job starting for drive mirroring. 3682 * Caller should hold @device and @target's aio context (must be the same). 3683 **/ 3684 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3685 BlockDriverState *target, 3686 bool has_replaces, const char *replaces, 3687 enum MirrorSyncMode sync, 3688 BlockMirrorBackingMode backing_mode, 3689 bool has_speed, int64_t speed, 3690 bool has_granularity, uint32_t granularity, 3691 bool has_buf_size, int64_t buf_size, 3692 bool has_on_source_error, 3693 BlockdevOnError on_source_error, 3694 bool has_on_target_error, 3695 BlockdevOnError on_target_error, 3696 bool has_unmap, bool unmap, 3697 bool has_filter_node_name, 3698 const char *filter_node_name, 3699 bool has_copy_mode, MirrorCopyMode copy_mode, 3700 bool has_auto_finalize, bool auto_finalize, 3701 bool has_auto_dismiss, bool auto_dismiss, 3702 Error **errp) 3703 { 3704 int job_flags = JOB_DEFAULT; 3705 3706 if (!has_speed) { 3707 speed = 0; 3708 } 3709 if (!has_on_source_error) { 3710 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3711 } 3712 if (!has_on_target_error) { 3713 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3714 } 3715 if (!has_granularity) { 3716 granularity = 0; 3717 } 3718 if (!has_buf_size) { 3719 buf_size = 0; 3720 } 3721 if (!has_unmap) { 3722 unmap = true; 3723 } 3724 if (!has_filter_node_name) { 3725 filter_node_name = NULL; 3726 } 3727 if (!has_copy_mode) { 3728 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3729 } 3730 if (has_auto_finalize && !auto_finalize) { 3731 job_flags |= JOB_MANUAL_FINALIZE; 3732 } 3733 if (has_auto_dismiss && !auto_dismiss) { 3734 job_flags |= JOB_MANUAL_DISMISS; 3735 } 3736 3737 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3738 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3739 "a value in range [512B, 64MB]"); 3740 return; 3741 } 3742 if (granularity & (granularity - 1)) { 3743 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3744 "power of 2"); 3745 return; 3746 } 3747 3748 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3749 return; 3750 } 3751 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3752 return; 3753 } 3754 3755 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3756 sync = MIRROR_SYNC_MODE_FULL; 3757 } 3758 3759 if (has_replaces) { 3760 BlockDriverState *to_replace_bs; 3761 AioContext *replace_aio_context; 3762 int64_t bs_size, replace_size; 3763 3764 bs_size = bdrv_getlength(bs); 3765 if (bs_size < 0) { 3766 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3767 return; 3768 } 3769 3770 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3771 if (!to_replace_bs) { 3772 return; 3773 } 3774 3775 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3776 aio_context_acquire(replace_aio_context); 3777 replace_size = bdrv_getlength(to_replace_bs); 3778 aio_context_release(replace_aio_context); 3779 3780 if (replace_size < 0) { 3781 error_setg_errno(errp, -replace_size, 3782 "Failed to query the replacement node's size"); 3783 return; 3784 } 3785 if (bs_size != replace_size) { 3786 error_setg(errp, "cannot replace image with a mirror image of " 3787 "different size"); 3788 return; 3789 } 3790 } 3791 3792 /* pass the node name to replace to mirror start since it's loose coupling 3793 * and will allow to check whether the node still exist at mirror completion 3794 */ 3795 mirror_start(job_id, bs, target, 3796 has_replaces ? replaces : NULL, job_flags, 3797 speed, granularity, buf_size, sync, backing_mode, 3798 on_source_error, on_target_error, unmap, filter_node_name, 3799 copy_mode, errp); 3800 } 3801 3802 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3803 { 3804 BlockDriverState *bs; 3805 BlockDriverState *source, *target_bs; 3806 AioContext *aio_context; 3807 BlockMirrorBackingMode backing_mode; 3808 Error *local_err = NULL; 3809 QDict *options = NULL; 3810 int flags; 3811 int64_t size; 3812 const char *format = arg->format; 3813 3814 bs = qmp_get_root_bs(arg->device, errp); 3815 if (!bs) { 3816 return; 3817 } 3818 3819 /* Early check to avoid creating target */ 3820 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3821 return; 3822 } 3823 3824 aio_context = bdrv_get_aio_context(bs); 3825 aio_context_acquire(aio_context); 3826 3827 if (!arg->has_mode) { 3828 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3829 } 3830 3831 if (!arg->has_format) { 3832 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3833 ? NULL : bs->drv->format_name); 3834 } 3835 3836 flags = bs->open_flags | BDRV_O_RDWR; 3837 source = backing_bs(bs); 3838 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3839 arg->sync = MIRROR_SYNC_MODE_FULL; 3840 } 3841 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3842 source = bs; 3843 } 3844 3845 size = bdrv_getlength(bs); 3846 if (size < 0) { 3847 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3848 goto out; 3849 } 3850 3851 if (arg->has_replaces) { 3852 if (!arg->has_node_name) { 3853 error_setg(errp, "a node-name must be provided when replacing a" 3854 " named node of the graph"); 3855 goto out; 3856 } 3857 } 3858 3859 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3860 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3861 } else { 3862 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3863 } 3864 3865 /* Don't open backing image in create() */ 3866 flags |= BDRV_O_NO_BACKING; 3867 3868 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3869 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3870 { 3871 /* create new image w/o backing file */ 3872 assert(format); 3873 bdrv_img_create(arg->target, format, 3874 NULL, NULL, NULL, size, flags, false, &local_err); 3875 } else { 3876 switch (arg->mode) { 3877 case NEW_IMAGE_MODE_EXISTING: 3878 break; 3879 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3880 /* create new image with backing file */ 3881 bdrv_refresh_filename(source); 3882 bdrv_img_create(arg->target, format, 3883 source->filename, 3884 source->drv->format_name, 3885 NULL, size, flags, false, &local_err); 3886 break; 3887 default: 3888 abort(); 3889 } 3890 } 3891 3892 if (local_err) { 3893 error_propagate(errp, local_err); 3894 goto out; 3895 } 3896 3897 options = qdict_new(); 3898 if (arg->has_node_name) { 3899 qdict_put_str(options, "node-name", arg->node_name); 3900 } 3901 if (format) { 3902 qdict_put_str(options, "driver", format); 3903 } 3904 3905 /* Mirroring takes care of copy-on-write using the source's backing 3906 * file. 3907 */ 3908 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3909 if (!target_bs) { 3910 goto out; 3911 } 3912 3913 bdrv_set_aio_context(target_bs, aio_context); 3914 3915 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3916 arg->has_replaces, arg->replaces, arg->sync, 3917 backing_mode, arg->has_speed, arg->speed, 3918 arg->has_granularity, arg->granularity, 3919 arg->has_buf_size, arg->buf_size, 3920 arg->has_on_source_error, arg->on_source_error, 3921 arg->has_on_target_error, arg->on_target_error, 3922 arg->has_unmap, arg->unmap, 3923 false, NULL, 3924 arg->has_copy_mode, arg->copy_mode, 3925 arg->has_auto_finalize, arg->auto_finalize, 3926 arg->has_auto_dismiss, arg->auto_dismiss, 3927 &local_err); 3928 bdrv_unref(target_bs); 3929 error_propagate(errp, local_err); 3930 out: 3931 aio_context_release(aio_context); 3932 } 3933 3934 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3935 const char *device, const char *target, 3936 bool has_replaces, const char *replaces, 3937 MirrorSyncMode sync, 3938 bool has_speed, int64_t speed, 3939 bool has_granularity, uint32_t granularity, 3940 bool has_buf_size, int64_t buf_size, 3941 bool has_on_source_error, 3942 BlockdevOnError on_source_error, 3943 bool has_on_target_error, 3944 BlockdevOnError on_target_error, 3945 bool has_filter_node_name, 3946 const char *filter_node_name, 3947 bool has_copy_mode, MirrorCopyMode copy_mode, 3948 bool has_auto_finalize, bool auto_finalize, 3949 bool has_auto_dismiss, bool auto_dismiss, 3950 Error **errp) 3951 { 3952 BlockDriverState *bs; 3953 BlockDriverState *target_bs; 3954 AioContext *aio_context; 3955 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3956 Error *local_err = NULL; 3957 3958 bs = qmp_get_root_bs(device, errp); 3959 if (!bs) { 3960 return; 3961 } 3962 3963 target_bs = bdrv_lookup_bs(target, target, errp); 3964 if (!target_bs) { 3965 return; 3966 } 3967 3968 aio_context = bdrv_get_aio_context(bs); 3969 aio_context_acquire(aio_context); 3970 3971 bdrv_set_aio_context(target_bs, aio_context); 3972 3973 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3974 has_replaces, replaces, sync, backing_mode, 3975 has_speed, speed, 3976 has_granularity, granularity, 3977 has_buf_size, buf_size, 3978 has_on_source_error, on_source_error, 3979 has_on_target_error, on_target_error, 3980 true, true, 3981 has_filter_node_name, filter_node_name, 3982 has_copy_mode, copy_mode, 3983 has_auto_finalize, auto_finalize, 3984 has_auto_dismiss, auto_dismiss, 3985 &local_err); 3986 error_propagate(errp, local_err); 3987 3988 aio_context_release(aio_context); 3989 } 3990 3991 /* Get a block job using its ID and acquire its AioContext */ 3992 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3993 Error **errp) 3994 { 3995 BlockJob *job; 3996 3997 assert(id != NULL); 3998 3999 *aio_context = NULL; 4000 4001 job = block_job_get(id); 4002 4003 if (!job) { 4004 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4005 "Block job '%s' not found", id); 4006 return NULL; 4007 } 4008 4009 *aio_context = blk_get_aio_context(job->blk); 4010 aio_context_acquire(*aio_context); 4011 4012 return job; 4013 } 4014 4015 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4016 { 4017 AioContext *aio_context; 4018 BlockJob *job = find_block_job(device, &aio_context, errp); 4019 4020 if (!job) { 4021 return; 4022 } 4023 4024 block_job_set_speed(job, speed, errp); 4025 aio_context_release(aio_context); 4026 } 4027 4028 void qmp_block_job_cancel(const char *device, 4029 bool has_force, bool force, Error **errp) 4030 { 4031 AioContext *aio_context; 4032 BlockJob *job = find_block_job(device, &aio_context, errp); 4033 4034 if (!job) { 4035 return; 4036 } 4037 4038 if (!has_force) { 4039 force = false; 4040 } 4041 4042 if (job_user_paused(&job->job) && !force) { 4043 error_setg(errp, "The block job for device '%s' is currently paused", 4044 device); 4045 goto out; 4046 } 4047 4048 trace_qmp_block_job_cancel(job); 4049 job_user_cancel(&job->job, force, errp); 4050 out: 4051 aio_context_release(aio_context); 4052 } 4053 4054 void qmp_block_job_pause(const char *device, Error **errp) 4055 { 4056 AioContext *aio_context; 4057 BlockJob *job = find_block_job(device, &aio_context, errp); 4058 4059 if (!job) { 4060 return; 4061 } 4062 4063 trace_qmp_block_job_pause(job); 4064 job_user_pause(&job->job, errp); 4065 aio_context_release(aio_context); 4066 } 4067 4068 void qmp_block_job_resume(const char *device, Error **errp) 4069 { 4070 AioContext *aio_context; 4071 BlockJob *job = find_block_job(device, &aio_context, errp); 4072 4073 if (!job) { 4074 return; 4075 } 4076 4077 trace_qmp_block_job_resume(job); 4078 job_user_resume(&job->job, errp); 4079 aio_context_release(aio_context); 4080 } 4081 4082 void qmp_block_job_complete(const char *device, Error **errp) 4083 { 4084 AioContext *aio_context; 4085 BlockJob *job = find_block_job(device, &aio_context, errp); 4086 4087 if (!job) { 4088 return; 4089 } 4090 4091 trace_qmp_block_job_complete(job); 4092 job_complete(&job->job, errp); 4093 aio_context_release(aio_context); 4094 } 4095 4096 void qmp_block_job_finalize(const char *id, Error **errp) 4097 { 4098 AioContext *aio_context; 4099 BlockJob *job = find_block_job(id, &aio_context, errp); 4100 4101 if (!job) { 4102 return; 4103 } 4104 4105 trace_qmp_block_job_finalize(job); 4106 job_finalize(&job->job, errp); 4107 aio_context_release(aio_context); 4108 } 4109 4110 void qmp_block_job_dismiss(const char *id, Error **errp) 4111 { 4112 AioContext *aio_context; 4113 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4114 Job *job; 4115 4116 if (!bjob) { 4117 return; 4118 } 4119 4120 trace_qmp_block_job_dismiss(bjob); 4121 job = &bjob->job; 4122 job_dismiss(&job, errp); 4123 aio_context_release(aio_context); 4124 } 4125 4126 void qmp_change_backing_file(const char *device, 4127 const char *image_node_name, 4128 const char *backing_file, 4129 Error **errp) 4130 { 4131 BlockDriverState *bs = NULL; 4132 AioContext *aio_context; 4133 BlockDriverState *image_bs = NULL; 4134 Error *local_err = NULL; 4135 bool ro; 4136 int ret; 4137 4138 bs = qmp_get_root_bs(device, errp); 4139 if (!bs) { 4140 return; 4141 } 4142 4143 aio_context = bdrv_get_aio_context(bs); 4144 aio_context_acquire(aio_context); 4145 4146 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4147 if (local_err) { 4148 error_propagate(errp, local_err); 4149 goto out; 4150 } 4151 4152 if (!image_bs) { 4153 error_setg(errp, "image file not found"); 4154 goto out; 4155 } 4156 4157 if (bdrv_find_base(image_bs) == image_bs) { 4158 error_setg(errp, "not allowing backing file change on an image " 4159 "without a backing file"); 4160 goto out; 4161 } 4162 4163 /* even though we are not necessarily operating on bs, we need it to 4164 * determine if block ops are currently prohibited on the chain */ 4165 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4166 goto out; 4167 } 4168 4169 /* final sanity check */ 4170 if (!bdrv_chain_contains(bs, image_bs)) { 4171 error_setg(errp, "'%s' and image file are not in the same chain", 4172 device); 4173 goto out; 4174 } 4175 4176 /* if not r/w, reopen to make r/w */ 4177 ro = bdrv_is_read_only(image_bs); 4178 4179 if (ro) { 4180 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4181 goto out; 4182 } 4183 } 4184 4185 ret = bdrv_change_backing_file(image_bs, backing_file, 4186 image_bs->drv ? image_bs->drv->format_name : ""); 4187 4188 if (ret < 0) { 4189 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4190 backing_file); 4191 /* don't exit here, so we can try to restore open flags if 4192 * appropriate */ 4193 } 4194 4195 if (ro) { 4196 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4197 error_propagate(errp, local_err); 4198 } 4199 4200 out: 4201 aio_context_release(aio_context); 4202 } 4203 4204 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4205 { 4206 QemuOpts *opts; 4207 QDict *qdict; 4208 Error *local_err = NULL; 4209 4210 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4211 if (!opts) { 4212 return; 4213 } 4214 4215 qdict = qemu_opts_to_qdict(opts, NULL); 4216 4217 if (!qdict_get_try_str(qdict, "node-name")) { 4218 qobject_unref(qdict); 4219 error_report("'node-name' needs to be specified"); 4220 goto out; 4221 } 4222 4223 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4224 if (!bs) { 4225 error_report_err(local_err); 4226 goto out; 4227 } 4228 4229 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4230 4231 out: 4232 qemu_opts_del(opts); 4233 } 4234 4235 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4236 { 4237 BlockDriverState *bs; 4238 QObject *obj; 4239 Visitor *v = qobject_output_visitor_new(&obj); 4240 QDict *qdict; 4241 Error *local_err = NULL; 4242 4243 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4244 if (local_err) { 4245 error_propagate(errp, local_err); 4246 goto fail; 4247 } 4248 4249 visit_complete(v, &obj); 4250 qdict = qobject_to(QDict, obj); 4251 4252 qdict_flatten(qdict); 4253 4254 if (!qdict_get_try_str(qdict, "node-name")) { 4255 error_setg(errp, "'node-name' must be specified for the root node"); 4256 goto fail; 4257 } 4258 4259 bs = bds_tree_init(qdict, errp); 4260 if (!bs) { 4261 goto fail; 4262 } 4263 4264 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4265 4266 fail: 4267 visit_free(v); 4268 } 4269 4270 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4271 { 4272 BlockDriverState *bs; 4273 AioContext *ctx; 4274 QObject *obj; 4275 Visitor *v = qobject_output_visitor_new(&obj); 4276 Error *local_err = NULL; 4277 BlockReopenQueue *queue; 4278 QDict *qdict; 4279 4280 /* Check for the selected node name */ 4281 if (!options->has_node_name) { 4282 error_setg(errp, "Node name not specified"); 4283 goto fail; 4284 } 4285 4286 bs = bdrv_find_node(options->node_name); 4287 if (!bs) { 4288 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4289 goto fail; 4290 } 4291 4292 /* Put all options in a QDict and flatten it */ 4293 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4294 if (local_err) { 4295 error_propagate(errp, local_err); 4296 goto fail; 4297 } 4298 4299 visit_complete(v, &obj); 4300 qdict = qobject_to(QDict, obj); 4301 4302 qdict_flatten(qdict); 4303 4304 /* Perform the reopen operation */ 4305 ctx = bdrv_get_aio_context(bs); 4306 aio_context_acquire(ctx); 4307 bdrv_subtree_drained_begin(bs); 4308 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4309 bdrv_reopen_multiple(queue, errp); 4310 bdrv_subtree_drained_end(bs); 4311 aio_context_release(ctx); 4312 4313 fail: 4314 visit_free(v); 4315 } 4316 4317 void qmp_blockdev_del(const char *node_name, Error **errp) 4318 { 4319 AioContext *aio_context; 4320 BlockDriverState *bs; 4321 4322 bs = bdrv_find_node(node_name); 4323 if (!bs) { 4324 error_setg(errp, "Cannot find node %s", node_name); 4325 return; 4326 } 4327 if (bdrv_has_blk(bs)) { 4328 error_setg(errp, "Node %s is in use", node_name); 4329 return; 4330 } 4331 aio_context = bdrv_get_aio_context(bs); 4332 aio_context_acquire(aio_context); 4333 4334 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4335 goto out; 4336 } 4337 4338 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4339 error_setg(errp, "Node %s is not owned by the monitor", 4340 bs->node_name); 4341 goto out; 4342 } 4343 4344 if (bs->refcnt > 1) { 4345 error_setg(errp, "Block device %s is in use", 4346 bdrv_get_device_or_node_name(bs)); 4347 goto out; 4348 } 4349 4350 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4351 bdrv_unref(bs); 4352 4353 out: 4354 aio_context_release(aio_context); 4355 } 4356 4357 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4358 const char *child_name) 4359 { 4360 BdrvChild *child; 4361 4362 QLIST_FOREACH(child, &parent_bs->children, next) { 4363 if (strcmp(child->name, child_name) == 0) { 4364 return child; 4365 } 4366 } 4367 4368 return NULL; 4369 } 4370 4371 void qmp_x_blockdev_change(const char *parent, bool has_child, 4372 const char *child, bool has_node, 4373 const char *node, Error **errp) 4374 { 4375 BlockDriverState *parent_bs, *new_bs = NULL; 4376 BdrvChild *p_child; 4377 4378 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4379 if (!parent_bs) { 4380 return; 4381 } 4382 4383 if (has_child == has_node) { 4384 if (has_child) { 4385 error_setg(errp, "The parameters child and node are in conflict"); 4386 } else { 4387 error_setg(errp, "Either child or node must be specified"); 4388 } 4389 return; 4390 } 4391 4392 if (has_child) { 4393 p_child = bdrv_find_child(parent_bs, child); 4394 if (!p_child) { 4395 error_setg(errp, "Node '%s' does not have child '%s'", 4396 parent, child); 4397 return; 4398 } 4399 bdrv_del_child(parent_bs, p_child, errp); 4400 } 4401 4402 if (has_node) { 4403 new_bs = bdrv_find_node(node); 4404 if (!new_bs) { 4405 error_setg(errp, "Node '%s' not found", node); 4406 return; 4407 } 4408 bdrv_add_child(parent_bs, new_bs, errp); 4409 } 4410 } 4411 4412 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4413 { 4414 BlockJobInfoList *head = NULL, **p_next = &head; 4415 BlockJob *job; 4416 4417 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4418 BlockJobInfoList *elem; 4419 AioContext *aio_context; 4420 4421 if (block_job_is_internal(job)) { 4422 continue; 4423 } 4424 elem = g_new0(BlockJobInfoList, 1); 4425 aio_context = blk_get_aio_context(job->blk); 4426 aio_context_acquire(aio_context); 4427 elem->value = block_job_query(job, errp); 4428 aio_context_release(aio_context); 4429 if (!elem->value) { 4430 g_free(elem); 4431 qapi_free_BlockJobInfoList(head); 4432 return NULL; 4433 } 4434 *p_next = elem; 4435 p_next = &elem->next; 4436 } 4437 4438 return head; 4439 } 4440 4441 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4442 bool has_force, bool force, Error **errp) 4443 { 4444 AioContext *old_context; 4445 AioContext *new_context; 4446 BlockDriverState *bs; 4447 4448 bs = bdrv_find_node(node_name); 4449 if (!bs) { 4450 error_setg(errp, "Cannot find node %s", node_name); 4451 return; 4452 } 4453 4454 /* Protects against accidents. */ 4455 if (!(has_force && force) && bdrv_has_blk(bs)) { 4456 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4457 "be in use (use force=true to override this check)", 4458 node_name); 4459 return; 4460 } 4461 4462 if (iothread->type == QTYPE_QSTRING) { 4463 IOThread *obj = iothread_by_id(iothread->u.s); 4464 if (!obj) { 4465 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4466 return; 4467 } 4468 4469 new_context = iothread_get_aio_context(obj); 4470 } else { 4471 new_context = qemu_get_aio_context(); 4472 } 4473 4474 old_context = bdrv_get_aio_context(bs); 4475 aio_context_acquire(old_context); 4476 4477 bdrv_set_aio_context(bs, new_context); 4478 4479 aio_context_release(old_context); 4480 } 4481 4482 void qmp_block_latency_histogram_set( 4483 const char *id, 4484 bool has_boundaries, uint64List *boundaries, 4485 bool has_boundaries_read, uint64List *boundaries_read, 4486 bool has_boundaries_write, uint64List *boundaries_write, 4487 bool has_boundaries_flush, uint64List *boundaries_flush, 4488 Error **errp) 4489 { 4490 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4491 BlockAcctStats *stats; 4492 int ret; 4493 4494 if (!blk) { 4495 return; 4496 } 4497 4498 stats = blk_get_stats(blk); 4499 4500 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4501 !has_boundaries_flush) 4502 { 4503 block_latency_histograms_clear(stats); 4504 return; 4505 } 4506 4507 if (has_boundaries || has_boundaries_read) { 4508 ret = block_latency_histogram_set( 4509 stats, BLOCK_ACCT_READ, 4510 has_boundaries_read ? boundaries_read : boundaries); 4511 if (ret) { 4512 error_setg(errp, "Device '%s' set read boundaries fail", id); 4513 return; 4514 } 4515 } 4516 4517 if (has_boundaries || has_boundaries_write) { 4518 ret = block_latency_histogram_set( 4519 stats, BLOCK_ACCT_WRITE, 4520 has_boundaries_write ? boundaries_write : boundaries); 4521 if (ret) { 4522 error_setg(errp, "Device '%s' set write boundaries fail", id); 4523 return; 4524 } 4525 } 4526 4527 if (has_boundaries || has_boundaries_flush) { 4528 ret = block_latency_histogram_set( 4529 stats, BLOCK_ACCT_FLUSH, 4530 has_boundaries_flush ? boundaries_flush : boundaries); 4531 if (ret) { 4532 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4533 return; 4534 } 4535 } 4536 } 4537 4538 QemuOptsList qemu_common_drive_opts = { 4539 .name = "drive", 4540 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4541 .desc = { 4542 { 4543 .name = "snapshot", 4544 .type = QEMU_OPT_BOOL, 4545 .help = "enable/disable snapshot mode", 4546 },{ 4547 .name = "aio", 4548 .type = QEMU_OPT_STRING, 4549 .help = "host AIO implementation (threads, native)", 4550 },{ 4551 .name = BDRV_OPT_CACHE_WB, 4552 .type = QEMU_OPT_BOOL, 4553 .help = "Enable writeback mode", 4554 },{ 4555 .name = "format", 4556 .type = QEMU_OPT_STRING, 4557 .help = "disk format (raw, qcow2, ...)", 4558 },{ 4559 .name = "rerror", 4560 .type = QEMU_OPT_STRING, 4561 .help = "read error action", 4562 },{ 4563 .name = "werror", 4564 .type = QEMU_OPT_STRING, 4565 .help = "write error action", 4566 },{ 4567 .name = BDRV_OPT_READ_ONLY, 4568 .type = QEMU_OPT_BOOL, 4569 .help = "open drive file as read-only", 4570 }, 4571 4572 THROTTLE_OPTS, 4573 4574 { 4575 .name = "throttling.group", 4576 .type = QEMU_OPT_STRING, 4577 .help = "name of the block throttling group", 4578 },{ 4579 .name = "copy-on-read", 4580 .type = QEMU_OPT_BOOL, 4581 .help = "copy read data from backing file into image file", 4582 },{ 4583 .name = "detect-zeroes", 4584 .type = QEMU_OPT_STRING, 4585 .help = "try to optimize zero writes (off, on, unmap)", 4586 },{ 4587 .name = "stats-account-invalid", 4588 .type = QEMU_OPT_BOOL, 4589 .help = "whether to account for invalid I/O operations " 4590 "in the statistics", 4591 },{ 4592 .name = "stats-account-failed", 4593 .type = QEMU_OPT_BOOL, 4594 .help = "whether to account for failed I/O operations " 4595 "in the statistics", 4596 }, 4597 { /* end of list */ } 4598 }, 4599 }; 4600 4601 QemuOptsList qemu_drive_opts = { 4602 .name = "drive", 4603 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4604 .desc = { 4605 /* 4606 * no elements => accept any params 4607 * validation will happen later 4608 */ 4609 { /* end of list */ } 4610 }, 4611 }; 4612