1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "qemu/osdep.h" 34 #include "sysemu/block-backend.h" 35 #include "sysemu/blockdev.h" 36 #include "hw/block/block.h" 37 #include "block/blockjob.h" 38 #include "block/qdict.h" 39 #include "block/throttle-groups.h" 40 #include "monitor/monitor.h" 41 #include "qemu/error-report.h" 42 #include "qemu/option.h" 43 #include "qemu/qemu-print.h" 44 #include "qemu/config-file.h" 45 #include "qapi/qapi-commands-block.h" 46 #include "qapi/qapi-commands-transaction.h" 47 #include "qapi/qapi-visit-block-core.h" 48 #include "qapi/qmp/qdict.h" 49 #include "qapi/qmp/qnum.h" 50 #include "qapi/qmp/qstring.h" 51 #include "qapi/error.h" 52 #include "qapi/qmp/qerror.h" 53 #include "qapi/qmp/qlist.h" 54 #include "qapi/qobject-output-visitor.h" 55 #include "sysemu/sysemu.h" 56 #include "sysemu/iothread.h" 57 #include "block/block_int.h" 58 #include "block/trace.h" 59 #include "sysemu/arch_init.h" 60 #include "sysemu/qtest.h" 61 #include "qemu/cutils.h" 62 #include "qemu/help_option.h" 63 #include "qemu/throttle-options.h" 64 65 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 66 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 67 68 static int do_open_tray(const char *blk_name, const char *qdev_id, 69 bool force, Error **errp); 70 static void blockdev_remove_medium(bool has_device, const char *device, 71 bool has_id, const char *id, Error **errp); 72 static void blockdev_insert_medium(bool has_device, const char *device, 73 bool has_id, const char *id, 74 const char *node_name, Error **errp); 75 76 static const char *const if_name[IF_COUNT] = { 77 [IF_NONE] = "none", 78 [IF_IDE] = "ide", 79 [IF_SCSI] = "scsi", 80 [IF_FLOPPY] = "floppy", 81 [IF_PFLASH] = "pflash", 82 [IF_MTD] = "mtd", 83 [IF_SD] = "sd", 84 [IF_VIRTIO] = "virtio", 85 [IF_XEN] = "xen", 86 }; 87 88 static int if_max_devs[IF_COUNT] = { 89 /* 90 * Do not change these numbers! They govern how drive option 91 * index maps to unit and bus. That mapping is ABI. 92 * 93 * All controllers used to implement if=T drives need to support 94 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 95 * Otherwise, some index values map to "impossible" bus, unit 96 * values. 97 * 98 * For instance, if you change [IF_SCSI] to 255, -drive 99 * if=scsi,index=12 no longer means bus=1,unit=5, but 100 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 101 * the drive can't be set up. Regression. 102 */ 103 [IF_IDE] = 2, 104 [IF_SCSI] = 7, 105 }; 106 107 /** 108 * Boards may call this to offer board-by-board overrides 109 * of the default, global values. 110 */ 111 void override_max_devs(BlockInterfaceType type, int max_devs) 112 { 113 BlockBackend *blk; 114 DriveInfo *dinfo; 115 116 if (max_devs <= 0) { 117 return; 118 } 119 120 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 121 dinfo = blk_legacy_dinfo(blk); 122 if (dinfo->type == type) { 123 fprintf(stderr, "Cannot override units-per-bus property of" 124 " the %s interface, because a drive of that type has" 125 " already been added.\n", if_name[type]); 126 g_assert_not_reached(); 127 } 128 } 129 130 if_max_devs[type] = max_devs; 131 } 132 133 /* 134 * We automatically delete the drive when a device using it gets 135 * unplugged. Questionable feature, but we can't just drop it. 136 * Device models call blockdev_mark_auto_del() to schedule the 137 * automatic deletion, and generic qdev code calls blockdev_auto_del() 138 * when deletion is actually safe. 139 */ 140 void blockdev_mark_auto_del(BlockBackend *blk) 141 { 142 DriveInfo *dinfo = blk_legacy_dinfo(blk); 143 BlockDriverState *bs = blk_bs(blk); 144 AioContext *aio_context; 145 146 if (!dinfo) { 147 return; 148 } 149 150 if (bs) { 151 aio_context = bdrv_get_aio_context(bs); 152 aio_context_acquire(aio_context); 153 154 if (bs->job) { 155 job_cancel(&bs->job->job, false); 156 } 157 158 aio_context_release(aio_context); 159 } 160 161 dinfo->auto_del = 1; 162 } 163 164 void blockdev_auto_del(BlockBackend *blk) 165 { 166 DriveInfo *dinfo = blk_legacy_dinfo(blk); 167 168 if (dinfo && dinfo->auto_del) { 169 monitor_remove_blk(blk); 170 blk_unref(blk); 171 } 172 } 173 174 /** 175 * Returns the current mapping of how many units per bus 176 * a particular interface can support. 177 * 178 * A positive integer indicates n units per bus. 179 * 0 implies the mapping has not been established. 180 * -1 indicates an invalid BlockInterfaceType was given. 181 */ 182 int drive_get_max_devs(BlockInterfaceType type) 183 { 184 if (type >= IF_IDE && type < IF_COUNT) { 185 return if_max_devs[type]; 186 } 187 188 return -1; 189 } 190 191 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 192 { 193 int max_devs = if_max_devs[type]; 194 return max_devs ? index / max_devs : 0; 195 } 196 197 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 198 { 199 int max_devs = if_max_devs[type]; 200 return max_devs ? index % max_devs : index; 201 } 202 203 QemuOpts *drive_def(const char *optstr) 204 { 205 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 206 } 207 208 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 209 const char *optstr) 210 { 211 QemuOpts *opts; 212 213 opts = drive_def(optstr); 214 if (!opts) { 215 return NULL; 216 } 217 if (type != IF_DEFAULT) { 218 qemu_opt_set(opts, "if", if_name[type], &error_abort); 219 } 220 if (index >= 0) { 221 qemu_opt_set_number(opts, "index", index, &error_abort); 222 } 223 if (file) 224 qemu_opt_set(opts, "file", file, &error_abort); 225 return opts; 226 } 227 228 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 229 { 230 BlockBackend *blk; 231 DriveInfo *dinfo; 232 233 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 234 dinfo = blk_legacy_dinfo(blk); 235 if (dinfo && dinfo->type == type 236 && dinfo->bus == bus && dinfo->unit == unit) { 237 return dinfo; 238 } 239 } 240 241 return NULL; 242 } 243 244 void drive_check_orphaned(void) 245 { 246 BlockBackend *blk; 247 DriveInfo *dinfo; 248 Location loc; 249 bool orphans = false; 250 251 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 252 dinfo = blk_legacy_dinfo(blk); 253 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 254 dinfo->type != IF_NONE) { 255 loc_push_none(&loc); 256 qemu_opts_loc_restore(dinfo->opts); 257 error_report("machine type does not support" 258 " if=%s,bus=%d,unit=%d", 259 if_name[dinfo->type], dinfo->bus, dinfo->unit); 260 loc_pop(&loc); 261 orphans = true; 262 } 263 } 264 265 if (orphans) { 266 exit(1); 267 } 268 } 269 270 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 271 { 272 return drive_get(type, 273 drive_index_to_bus_id(type, index), 274 drive_index_to_unit_id(type, index)); 275 } 276 277 int drive_get_max_bus(BlockInterfaceType type) 278 { 279 int max_bus; 280 BlockBackend *blk; 281 DriveInfo *dinfo; 282 283 max_bus = -1; 284 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 285 dinfo = blk_legacy_dinfo(blk); 286 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 287 max_bus = dinfo->bus; 288 } 289 } 290 return max_bus; 291 } 292 293 /* Get a block device. This should only be used for single-drive devices 294 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 295 appropriate bus. */ 296 DriveInfo *drive_get_next(BlockInterfaceType type) 297 { 298 static int next_block_unit[IF_COUNT]; 299 300 return drive_get(type, 0, next_block_unit[type]++); 301 } 302 303 static void bdrv_format_print(void *opaque, const char *name) 304 { 305 qemu_printf(" %s", name); 306 } 307 308 typedef struct { 309 QEMUBH *bh; 310 BlockDriverState *bs; 311 } BDRVPutRefBH; 312 313 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 314 { 315 if (!strcmp(buf, "ignore")) { 316 return BLOCKDEV_ON_ERROR_IGNORE; 317 } else if (!is_read && !strcmp(buf, "enospc")) { 318 return BLOCKDEV_ON_ERROR_ENOSPC; 319 } else if (!strcmp(buf, "stop")) { 320 return BLOCKDEV_ON_ERROR_STOP; 321 } else if (!strcmp(buf, "report")) { 322 return BLOCKDEV_ON_ERROR_REPORT; 323 } else { 324 error_setg(errp, "'%s' invalid %s error action", 325 buf, is_read ? "read" : "write"); 326 return -1; 327 } 328 } 329 330 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 331 Error **errp) 332 { 333 const QListEntry *entry; 334 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 335 switch (qobject_type(entry->value)) { 336 337 case QTYPE_QSTRING: { 338 unsigned long long length; 339 const char *str = qstring_get_str(qobject_to(QString, 340 entry->value)); 341 if (parse_uint_full(str, &length, 10) == 0 && 342 length > 0 && length <= UINT_MAX) { 343 block_acct_add_interval(stats, (unsigned) length); 344 } else { 345 error_setg(errp, "Invalid interval length: %s", str); 346 return false; 347 } 348 break; 349 } 350 351 case QTYPE_QNUM: { 352 int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); 353 354 if (length > 0 && length <= UINT_MAX) { 355 block_acct_add_interval(stats, (unsigned) length); 356 } else { 357 error_setg(errp, "Invalid interval length: %" PRId64, length); 358 return false; 359 } 360 break; 361 } 362 363 default: 364 error_setg(errp, "The specification of stats-intervals is invalid"); 365 return false; 366 } 367 } 368 return true; 369 } 370 371 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 372 373 /* All parameters but @opts are optional and may be set to NULL. */ 374 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 375 const char **throttling_group, ThrottleConfig *throttle_cfg, 376 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 377 { 378 Error *local_error = NULL; 379 const char *aio; 380 381 if (bdrv_flags) { 382 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 383 *bdrv_flags |= BDRV_O_COPY_ON_READ; 384 } 385 386 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 387 if (!strcmp(aio, "native")) { 388 *bdrv_flags |= BDRV_O_NATIVE_AIO; 389 } else if (!strcmp(aio, "threads")) { 390 /* this is the default */ 391 } else { 392 error_setg(errp, "invalid aio option"); 393 return; 394 } 395 } 396 } 397 398 /* disk I/O throttling */ 399 if (throttling_group) { 400 *throttling_group = qemu_opt_get(opts, "throttling.group"); 401 } 402 403 if (throttle_cfg) { 404 throttle_config_init(throttle_cfg); 405 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 406 qemu_opt_get_number(opts, "throttling.bps-total", 0); 407 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 408 qemu_opt_get_number(opts, "throttling.bps-read", 0); 409 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 410 qemu_opt_get_number(opts, "throttling.bps-write", 0); 411 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 412 qemu_opt_get_number(opts, "throttling.iops-total", 0); 413 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 414 qemu_opt_get_number(opts, "throttling.iops-read", 0); 415 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 416 qemu_opt_get_number(opts, "throttling.iops-write", 0); 417 418 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 420 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 422 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 424 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 426 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 428 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 430 431 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 432 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 433 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 434 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 435 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 436 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 437 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 438 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 439 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 440 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 441 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 442 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 443 444 throttle_cfg->op_size = 445 qemu_opt_get_number(opts, "throttling.iops-size", 0); 446 447 if (!throttle_is_valid(throttle_cfg, errp)) { 448 return; 449 } 450 } 451 452 if (detect_zeroes) { 453 *detect_zeroes = 454 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 455 qemu_opt_get(opts, "detect-zeroes"), 456 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 457 &local_error); 458 if (local_error) { 459 error_propagate(errp, local_error); 460 return; 461 } 462 } 463 } 464 465 /* Takes the ownership of bs_opts */ 466 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 467 Error **errp) 468 { 469 const char *buf; 470 int bdrv_flags = 0; 471 int on_read_error, on_write_error; 472 bool account_invalid, account_failed; 473 bool writethrough, read_only; 474 BlockBackend *blk; 475 BlockDriverState *bs; 476 ThrottleConfig cfg; 477 int snapshot = 0; 478 Error *error = NULL; 479 QemuOpts *opts; 480 QDict *interval_dict = NULL; 481 QList *interval_list = NULL; 482 const char *id; 483 BlockdevDetectZeroesOptions detect_zeroes = 484 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 485 const char *throttling_group = NULL; 486 487 /* Check common options by copying from bs_opts to opts, all other options 488 * stay in bs_opts for processing by bdrv_open(). */ 489 id = qdict_get_try_str(bs_opts, "id"); 490 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 491 if (error) { 492 error_propagate(errp, error); 493 goto err_no_opts; 494 } 495 496 qemu_opts_absorb_qdict(opts, bs_opts, &error); 497 if (error) { 498 error_propagate(errp, error); 499 goto early_err; 500 } 501 502 if (id) { 503 qdict_del(bs_opts, "id"); 504 } 505 506 /* extract parameters */ 507 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 508 509 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 510 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 511 512 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 513 514 id = qemu_opts_id(opts); 515 516 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 517 qdict_array_split(interval_dict, &interval_list); 518 519 if (qdict_size(interval_dict) != 0) { 520 error_setg(errp, "Invalid option stats-intervals.%s", 521 qdict_first(interval_dict)->key); 522 goto early_err; 523 } 524 525 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 526 &detect_zeroes, &error); 527 if (error) { 528 error_propagate(errp, error); 529 goto early_err; 530 } 531 532 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 533 if (is_help_option(buf)) { 534 qemu_printf("Supported formats:"); 535 bdrv_iterate_format(bdrv_format_print, NULL, false); 536 qemu_printf("\nSupported formats (read-only):"); 537 bdrv_iterate_format(bdrv_format_print, NULL, true); 538 qemu_printf("\n"); 539 goto early_err; 540 } 541 542 if (qdict_haskey(bs_opts, "driver")) { 543 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 544 goto early_err; 545 } 546 qdict_put_str(bs_opts, "driver", buf); 547 } 548 549 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 550 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 551 on_write_error = parse_block_error_action(buf, 0, &error); 552 if (error) { 553 error_propagate(errp, error); 554 goto early_err; 555 } 556 } 557 558 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 559 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 560 on_read_error = parse_block_error_action(buf, 1, &error); 561 if (error) { 562 error_propagate(errp, error); 563 goto early_err; 564 } 565 } 566 567 if (snapshot) { 568 bdrv_flags |= BDRV_O_SNAPSHOT; 569 } 570 571 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 572 573 /* init */ 574 if ((!file || !*file) && !qdict_size(bs_opts)) { 575 BlockBackendRootState *blk_rs; 576 577 blk = blk_new(0, BLK_PERM_ALL); 578 blk_rs = blk_get_root_state(blk); 579 blk_rs->open_flags = bdrv_flags; 580 blk_rs->read_only = read_only; 581 blk_rs->detect_zeroes = detect_zeroes; 582 583 qobject_unref(bs_opts); 584 } else { 585 if (file && !*file) { 586 file = NULL; 587 } 588 589 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 590 * with other callers) rather than what we want as the real defaults. 591 * Apply the defaults here instead. */ 592 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 593 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 594 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 595 read_only ? "on" : "off"); 596 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); 597 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 598 599 if (runstate_check(RUN_STATE_INMIGRATE)) { 600 bdrv_flags |= BDRV_O_INACTIVE; 601 } 602 603 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 604 if (!blk) { 605 goto err_no_bs_opts; 606 } 607 bs = blk_bs(blk); 608 609 bs->detect_zeroes = detect_zeroes; 610 611 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 612 613 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 614 blk_unref(blk); 615 blk = NULL; 616 goto err_no_bs_opts; 617 } 618 } 619 620 /* disk I/O throttling */ 621 if (throttle_enabled(&cfg)) { 622 if (!throttling_group) { 623 throttling_group = id; 624 } 625 blk_io_limits_enable(blk, throttling_group); 626 blk_set_io_limits(blk, &cfg); 627 } 628 629 blk_set_enable_write_cache(blk, !writethrough); 630 blk_set_on_error(blk, on_read_error, on_write_error); 631 632 if (!monitor_add_blk(blk, id, errp)) { 633 blk_unref(blk); 634 blk = NULL; 635 goto err_no_bs_opts; 636 } 637 638 err_no_bs_opts: 639 qemu_opts_del(opts); 640 qobject_unref(interval_dict); 641 qobject_unref(interval_list); 642 return blk; 643 644 early_err: 645 qemu_opts_del(opts); 646 qobject_unref(interval_dict); 647 qobject_unref(interval_list); 648 err_no_opts: 649 qobject_unref(bs_opts); 650 return NULL; 651 } 652 653 /* Takes the ownership of bs_opts */ 654 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 655 { 656 int bdrv_flags = 0; 657 658 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 659 * with other callers) rather than what we want as the real defaults. 660 * Apply the defaults here instead. */ 661 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 662 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 663 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 664 665 if (runstate_check(RUN_STATE_INMIGRATE)) { 666 bdrv_flags |= BDRV_O_INACTIVE; 667 } 668 669 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 670 } 671 672 void blockdev_close_all_bdrv_states(void) 673 { 674 BlockDriverState *bs, *next_bs; 675 676 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 677 AioContext *ctx = bdrv_get_aio_context(bs); 678 679 aio_context_acquire(ctx); 680 bdrv_unref(bs); 681 aio_context_release(ctx); 682 } 683 } 684 685 /* Iterates over the list of monitor-owned BlockDriverStates */ 686 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 687 { 688 return bs ? QTAILQ_NEXT(bs, monitor_list) 689 : QTAILQ_FIRST(&monitor_bdrv_states); 690 } 691 692 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 693 Error **errp) 694 { 695 const char *value; 696 697 value = qemu_opt_get(opts, from); 698 if (value) { 699 if (qemu_opt_find(opts, to)) { 700 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 701 "same time", to, from); 702 return; 703 } 704 } 705 706 /* rename all items in opts */ 707 while ((value = qemu_opt_get(opts, from))) { 708 qemu_opt_set(opts, to, value, &error_abort); 709 qemu_opt_unset(opts, from); 710 } 711 } 712 713 QemuOptsList qemu_legacy_drive_opts = { 714 .name = "drive", 715 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 716 .desc = { 717 { 718 .name = "bus", 719 .type = QEMU_OPT_NUMBER, 720 .help = "bus number", 721 },{ 722 .name = "unit", 723 .type = QEMU_OPT_NUMBER, 724 .help = "unit number (i.e. lun for scsi)", 725 },{ 726 .name = "index", 727 .type = QEMU_OPT_NUMBER, 728 .help = "index number", 729 },{ 730 .name = "media", 731 .type = QEMU_OPT_STRING, 732 .help = "media type (disk, cdrom)", 733 },{ 734 .name = "if", 735 .type = QEMU_OPT_STRING, 736 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 737 },{ 738 .name = "file", 739 .type = QEMU_OPT_STRING, 740 .help = "file name", 741 }, 742 743 /* Options that are passed on, but have special semantics with -drive */ 744 { 745 .name = BDRV_OPT_READ_ONLY, 746 .type = QEMU_OPT_BOOL, 747 .help = "open drive file as read-only", 748 },{ 749 .name = "rerror", 750 .type = QEMU_OPT_STRING, 751 .help = "read error action", 752 },{ 753 .name = "werror", 754 .type = QEMU_OPT_STRING, 755 .help = "write error action", 756 },{ 757 .name = "copy-on-read", 758 .type = QEMU_OPT_BOOL, 759 .help = "copy read data from backing file into image file", 760 }, 761 762 { /* end of list */ } 763 }, 764 }; 765 766 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, 767 Error **errp) 768 { 769 const char *value; 770 BlockBackend *blk; 771 DriveInfo *dinfo = NULL; 772 QDict *bs_opts; 773 QemuOpts *legacy_opts; 774 DriveMediaType media = MEDIA_DISK; 775 BlockInterfaceType type; 776 int max_devs, bus_id, unit_id, index; 777 const char *werror, *rerror; 778 bool read_only = false; 779 bool copy_on_read; 780 const char *filename; 781 Error *local_err = NULL; 782 int i; 783 784 /* Change legacy command line options into QMP ones */ 785 static const struct { 786 const char *from; 787 const char *to; 788 } opt_renames[] = { 789 { "iops", "throttling.iops-total" }, 790 { "iops_rd", "throttling.iops-read" }, 791 { "iops_wr", "throttling.iops-write" }, 792 793 { "bps", "throttling.bps-total" }, 794 { "bps_rd", "throttling.bps-read" }, 795 { "bps_wr", "throttling.bps-write" }, 796 797 { "iops_max", "throttling.iops-total-max" }, 798 { "iops_rd_max", "throttling.iops-read-max" }, 799 { "iops_wr_max", "throttling.iops-write-max" }, 800 801 { "bps_max", "throttling.bps-total-max" }, 802 { "bps_rd_max", "throttling.bps-read-max" }, 803 { "bps_wr_max", "throttling.bps-write-max" }, 804 805 { "iops_size", "throttling.iops-size" }, 806 807 { "group", "throttling.group" }, 808 809 { "readonly", BDRV_OPT_READ_ONLY }, 810 }; 811 812 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 813 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 814 &local_err); 815 if (local_err) { 816 error_propagate(errp, local_err); 817 return NULL; 818 } 819 } 820 821 value = qemu_opt_get(all_opts, "cache"); 822 if (value) { 823 int flags = 0; 824 bool writethrough; 825 826 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 827 error_setg(errp, "invalid cache option"); 828 return NULL; 829 } 830 831 /* Specific options take precedence */ 832 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 833 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 834 !writethrough, &error_abort); 835 } 836 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 837 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 838 !!(flags & BDRV_O_NOCACHE), &error_abort); 839 } 840 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 841 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 842 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 843 } 844 qemu_opt_unset(all_opts, "cache"); 845 } 846 847 /* Get a QDict for processing the options */ 848 bs_opts = qdict_new(); 849 qemu_opts_to_qdict(all_opts, bs_opts); 850 851 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 852 &error_abort); 853 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 854 if (local_err) { 855 error_propagate(errp, local_err); 856 goto fail; 857 } 858 859 /* Media type */ 860 value = qemu_opt_get(legacy_opts, "media"); 861 if (value) { 862 if (!strcmp(value, "disk")) { 863 media = MEDIA_DISK; 864 } else if (!strcmp(value, "cdrom")) { 865 media = MEDIA_CDROM; 866 read_only = true; 867 } else { 868 error_setg(errp, "'%s' invalid media", value); 869 goto fail; 870 } 871 } 872 873 /* copy-on-read is disabled with a warning for read-only devices */ 874 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 875 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 876 877 if (read_only && copy_on_read) { 878 warn_report("disabling copy-on-read on read-only drive"); 879 copy_on_read = false; 880 } 881 882 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 883 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 884 885 /* Controller type */ 886 value = qemu_opt_get(legacy_opts, "if"); 887 if (value) { 888 for (type = 0; 889 type < IF_COUNT && strcmp(value, if_name[type]); 890 type++) { 891 } 892 if (type == IF_COUNT) { 893 error_setg(errp, "unsupported bus type '%s'", value); 894 goto fail; 895 } 896 } else { 897 type = block_default_type; 898 } 899 900 /* Device address specified by bus/unit or index. 901 * If none was specified, try to find the first free one. */ 902 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 903 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 904 index = qemu_opt_get_number(legacy_opts, "index", -1); 905 906 max_devs = if_max_devs[type]; 907 908 if (index != -1) { 909 if (bus_id != 0 || unit_id != -1) { 910 error_setg(errp, "index cannot be used with bus and unit"); 911 goto fail; 912 } 913 bus_id = drive_index_to_bus_id(type, index); 914 unit_id = drive_index_to_unit_id(type, index); 915 } 916 917 if (unit_id == -1) { 918 unit_id = 0; 919 while (drive_get(type, bus_id, unit_id) != NULL) { 920 unit_id++; 921 if (max_devs && unit_id >= max_devs) { 922 unit_id -= max_devs; 923 bus_id++; 924 } 925 } 926 } 927 928 if (max_devs && unit_id >= max_devs) { 929 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); 930 goto fail; 931 } 932 933 if (drive_get(type, bus_id, unit_id) != NULL) { 934 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", 935 bus_id, unit_id, index); 936 goto fail; 937 } 938 939 /* no id supplied -> create one */ 940 if (qemu_opts_id(all_opts) == NULL) { 941 char *new_id; 942 const char *mediastr = ""; 943 if (type == IF_IDE || type == IF_SCSI) { 944 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 945 } 946 if (max_devs) { 947 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 948 mediastr, unit_id); 949 } else { 950 new_id = g_strdup_printf("%s%s%i", if_name[type], 951 mediastr, unit_id); 952 } 953 qdict_put_str(bs_opts, "id", new_id); 954 g_free(new_id); 955 } 956 957 /* Add virtio block device */ 958 if (type == IF_VIRTIO) { 959 QemuOpts *devopts; 960 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 961 &error_abort); 962 if (arch_type == QEMU_ARCH_S390X) { 963 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 964 } else { 965 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 966 } 967 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 968 &error_abort); 969 } 970 971 filename = qemu_opt_get(legacy_opts, "file"); 972 973 /* Check werror/rerror compatibility with if=... */ 974 werror = qemu_opt_get(legacy_opts, "werror"); 975 if (werror != NULL) { 976 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 977 type != IF_NONE) { 978 error_setg(errp, "werror is not supported by this bus type"); 979 goto fail; 980 } 981 qdict_put_str(bs_opts, "werror", werror); 982 } 983 984 rerror = qemu_opt_get(legacy_opts, "rerror"); 985 if (rerror != NULL) { 986 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 987 type != IF_NONE) { 988 error_setg(errp, "rerror is not supported by this bus type"); 989 goto fail; 990 } 991 qdict_put_str(bs_opts, "rerror", rerror); 992 } 993 994 /* Actual block device init: Functionality shared with blockdev-add */ 995 blk = blockdev_init(filename, bs_opts, &local_err); 996 bs_opts = NULL; 997 if (!blk) { 998 error_propagate(errp, local_err); 999 goto fail; 1000 } else { 1001 assert(!local_err); 1002 } 1003 1004 /* Create legacy DriveInfo */ 1005 dinfo = g_malloc0(sizeof(*dinfo)); 1006 dinfo->opts = all_opts; 1007 1008 dinfo->type = type; 1009 dinfo->bus = bus_id; 1010 dinfo->unit = unit_id; 1011 1012 blk_set_legacy_dinfo(blk, dinfo); 1013 1014 switch(type) { 1015 case IF_IDE: 1016 case IF_SCSI: 1017 case IF_XEN: 1018 case IF_NONE: 1019 dinfo->media_cd = media == MEDIA_CDROM; 1020 break; 1021 default: 1022 break; 1023 } 1024 1025 fail: 1026 qemu_opts_del(legacy_opts); 1027 qobject_unref(bs_opts); 1028 return dinfo; 1029 } 1030 1031 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1032 { 1033 BlockDriverState *bs; 1034 1035 bs = bdrv_lookup_bs(name, name, errp); 1036 if (bs == NULL) { 1037 return NULL; 1038 } 1039 1040 if (!bdrv_is_root_node(bs)) { 1041 error_setg(errp, "Need a root block node"); 1042 return NULL; 1043 } 1044 1045 if (!bdrv_is_inserted(bs)) { 1046 error_setg(errp, "Device has no medium"); 1047 return NULL; 1048 } 1049 1050 return bs; 1051 } 1052 1053 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1054 Error **errp) 1055 { 1056 BlockBackend *blk; 1057 1058 if (!blk_name == !qdev_id) { 1059 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1060 return NULL; 1061 } 1062 1063 if (qdev_id) { 1064 blk = blk_by_qdev_id(qdev_id, errp); 1065 } else { 1066 blk = blk_by_name(blk_name); 1067 if (blk == NULL) { 1068 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1069 "Device '%s' not found", blk_name); 1070 } 1071 } 1072 1073 return blk; 1074 } 1075 1076 void hmp_commit(Monitor *mon, const QDict *qdict) 1077 { 1078 const char *device = qdict_get_str(qdict, "device"); 1079 BlockBackend *blk; 1080 int ret; 1081 1082 if (!strcmp(device, "all")) { 1083 ret = blk_commit_all(); 1084 } else { 1085 BlockDriverState *bs; 1086 AioContext *aio_context; 1087 1088 blk = blk_by_name(device); 1089 if (!blk) { 1090 monitor_printf(mon, "Device '%s' not found\n", device); 1091 return; 1092 } 1093 if (!blk_is_available(blk)) { 1094 monitor_printf(mon, "Device '%s' has no medium\n", device); 1095 return; 1096 } 1097 1098 bs = blk_bs(blk); 1099 aio_context = bdrv_get_aio_context(bs); 1100 aio_context_acquire(aio_context); 1101 1102 ret = bdrv_commit(bs); 1103 1104 aio_context_release(aio_context); 1105 } 1106 if (ret < 0) { 1107 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1108 strerror(-ret)); 1109 } 1110 } 1111 1112 static void blockdev_do_action(TransactionAction *action, Error **errp) 1113 { 1114 TransactionActionList list; 1115 1116 list.value = action; 1117 list.next = NULL; 1118 qmp_transaction(&list, false, NULL, errp); 1119 } 1120 1121 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1122 bool has_node_name, const char *node_name, 1123 const char *snapshot_file, 1124 bool has_snapshot_node_name, 1125 const char *snapshot_node_name, 1126 bool has_format, const char *format, 1127 bool has_mode, NewImageMode mode, Error **errp) 1128 { 1129 BlockdevSnapshotSync snapshot = { 1130 .has_device = has_device, 1131 .device = (char *) device, 1132 .has_node_name = has_node_name, 1133 .node_name = (char *) node_name, 1134 .snapshot_file = (char *) snapshot_file, 1135 .has_snapshot_node_name = has_snapshot_node_name, 1136 .snapshot_node_name = (char *) snapshot_node_name, 1137 .has_format = has_format, 1138 .format = (char *) format, 1139 .has_mode = has_mode, 1140 .mode = mode, 1141 }; 1142 TransactionAction action = { 1143 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1144 .u.blockdev_snapshot_sync.data = &snapshot, 1145 }; 1146 blockdev_do_action(&action, errp); 1147 } 1148 1149 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1150 Error **errp) 1151 { 1152 BlockdevSnapshot snapshot_data = { 1153 .node = (char *) node, 1154 .overlay = (char *) overlay 1155 }; 1156 TransactionAction action = { 1157 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1158 .u.blockdev_snapshot.data = &snapshot_data, 1159 }; 1160 blockdev_do_action(&action, errp); 1161 } 1162 1163 void qmp_blockdev_snapshot_internal_sync(const char *device, 1164 const char *name, 1165 Error **errp) 1166 { 1167 BlockdevSnapshotInternal snapshot = { 1168 .device = (char *) device, 1169 .name = (char *) name 1170 }; 1171 TransactionAction action = { 1172 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1173 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1174 }; 1175 blockdev_do_action(&action, errp); 1176 } 1177 1178 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1179 bool has_id, 1180 const char *id, 1181 bool has_name, 1182 const char *name, 1183 Error **errp) 1184 { 1185 BlockDriverState *bs; 1186 AioContext *aio_context; 1187 QEMUSnapshotInfo sn; 1188 Error *local_err = NULL; 1189 SnapshotInfo *info = NULL; 1190 int ret; 1191 1192 bs = qmp_get_root_bs(device, errp); 1193 if (!bs) { 1194 return NULL; 1195 } 1196 aio_context = bdrv_get_aio_context(bs); 1197 aio_context_acquire(aio_context); 1198 1199 if (!has_id) { 1200 id = NULL; 1201 } 1202 1203 if (!has_name) { 1204 name = NULL; 1205 } 1206 1207 if (!id && !name) { 1208 error_setg(errp, "Name or id must be provided"); 1209 goto out_aio_context; 1210 } 1211 1212 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1213 goto out_aio_context; 1214 } 1215 1216 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1217 if (local_err) { 1218 error_propagate(errp, local_err); 1219 goto out_aio_context; 1220 } 1221 if (!ret) { 1222 error_setg(errp, 1223 "Snapshot with id '%s' and name '%s' does not exist on " 1224 "device '%s'", 1225 STR_OR_NULL(id), STR_OR_NULL(name), device); 1226 goto out_aio_context; 1227 } 1228 1229 bdrv_snapshot_delete(bs, id, name, &local_err); 1230 if (local_err) { 1231 error_propagate(errp, local_err); 1232 goto out_aio_context; 1233 } 1234 1235 aio_context_release(aio_context); 1236 1237 info = g_new0(SnapshotInfo, 1); 1238 info->id = g_strdup(sn.id_str); 1239 info->name = g_strdup(sn.name); 1240 info->date_nsec = sn.date_nsec; 1241 info->date_sec = sn.date_sec; 1242 info->vm_state_size = sn.vm_state_size; 1243 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1244 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1245 1246 return info; 1247 1248 out_aio_context: 1249 aio_context_release(aio_context); 1250 return NULL; 1251 } 1252 1253 /** 1254 * block_dirty_bitmap_lookup: 1255 * Return a dirty bitmap (if present), after validating 1256 * the node reference and bitmap names. 1257 * 1258 * @node: The name of the BDS node to search for bitmaps 1259 * @name: The name of the bitmap to search for 1260 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1261 * @errp: Output pointer for error information. Can be NULL. 1262 * 1263 * @return: A bitmap object on success, or NULL on failure. 1264 */ 1265 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1266 const char *name, 1267 BlockDriverState **pbs, 1268 Error **errp) 1269 { 1270 BlockDriverState *bs; 1271 BdrvDirtyBitmap *bitmap; 1272 1273 if (!node) { 1274 error_setg(errp, "Node cannot be NULL"); 1275 return NULL; 1276 } 1277 if (!name) { 1278 error_setg(errp, "Bitmap name cannot be NULL"); 1279 return NULL; 1280 } 1281 bs = bdrv_lookup_bs(node, node, NULL); 1282 if (!bs) { 1283 error_setg(errp, "Node '%s' not found", node); 1284 return NULL; 1285 } 1286 1287 bitmap = bdrv_find_dirty_bitmap(bs, name); 1288 if (!bitmap) { 1289 error_setg(errp, "Dirty bitmap '%s' not found", name); 1290 return NULL; 1291 } 1292 1293 if (pbs) { 1294 *pbs = bs; 1295 } 1296 1297 return bitmap; 1298 } 1299 1300 /* New and old BlockDriverState structs for atomic group operations */ 1301 1302 typedef struct BlkActionState BlkActionState; 1303 1304 /** 1305 * BlkActionOps: 1306 * Table of operations that define an Action. 1307 * 1308 * @instance_size: Size of state struct, in bytes. 1309 * @prepare: Prepare the work, must NOT be NULL. 1310 * @commit: Commit the changes, can be NULL. 1311 * @abort: Abort the changes on fail, can be NULL. 1312 * @clean: Clean up resources after all transaction actions have called 1313 * commit() or abort(). Can be NULL. 1314 * 1315 * Only prepare() may fail. In a single transaction, only one of commit() or 1316 * abort() will be called. clean() will always be called if it is present. 1317 */ 1318 typedef struct BlkActionOps { 1319 size_t instance_size; 1320 void (*prepare)(BlkActionState *common, Error **errp); 1321 void (*commit)(BlkActionState *common); 1322 void (*abort)(BlkActionState *common); 1323 void (*clean)(BlkActionState *common); 1324 } BlkActionOps; 1325 1326 /** 1327 * BlkActionState: 1328 * Describes one Action's state within a Transaction. 1329 * 1330 * @action: QAPI-defined enum identifying which Action to perform. 1331 * @ops: Table of ActionOps this Action can perform. 1332 * @block_job_txn: Transaction which this action belongs to. 1333 * @entry: List membership for all Actions in this Transaction. 1334 * 1335 * This structure must be arranged as first member in a subclassed type, 1336 * assuming that the compiler will also arrange it to the same offsets as the 1337 * base class. 1338 */ 1339 struct BlkActionState { 1340 TransactionAction *action; 1341 const BlkActionOps *ops; 1342 JobTxn *block_job_txn; 1343 TransactionProperties *txn_props; 1344 QTAILQ_ENTRY(BlkActionState) entry; 1345 }; 1346 1347 /* internal snapshot private data */ 1348 typedef struct InternalSnapshotState { 1349 BlkActionState common; 1350 BlockDriverState *bs; 1351 QEMUSnapshotInfo sn; 1352 bool created; 1353 } InternalSnapshotState; 1354 1355 1356 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1357 { 1358 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1359 error_setg(errp, 1360 "Action '%s' does not support Transaction property " 1361 "completion-mode = %s", 1362 TransactionActionKind_str(s->action->type), 1363 ActionCompletionMode_str(s->txn_props->completion_mode)); 1364 return -1; 1365 } 1366 return 0; 1367 } 1368 1369 static void internal_snapshot_prepare(BlkActionState *common, 1370 Error **errp) 1371 { 1372 Error *local_err = NULL; 1373 const char *device; 1374 const char *name; 1375 BlockDriverState *bs; 1376 QEMUSnapshotInfo old_sn, *sn; 1377 bool ret; 1378 qemu_timeval tv; 1379 BlockdevSnapshotInternal *internal; 1380 InternalSnapshotState *state; 1381 AioContext *aio_context; 1382 int ret1; 1383 1384 g_assert(common->action->type == 1385 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1386 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1387 state = DO_UPCAST(InternalSnapshotState, common, common); 1388 1389 /* 1. parse input */ 1390 device = internal->device; 1391 name = internal->name; 1392 1393 /* 2. check for validation */ 1394 if (action_check_completion_mode(common, errp) < 0) { 1395 return; 1396 } 1397 1398 bs = qmp_get_root_bs(device, errp); 1399 if (!bs) { 1400 return; 1401 } 1402 1403 aio_context = bdrv_get_aio_context(bs); 1404 aio_context_acquire(aio_context); 1405 1406 state->bs = bs; 1407 1408 /* Paired with .clean() */ 1409 bdrv_drained_begin(bs); 1410 1411 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1412 goto out; 1413 } 1414 1415 if (bdrv_is_read_only(bs)) { 1416 error_setg(errp, "Device '%s' is read only", device); 1417 goto out; 1418 } 1419 1420 if (!bdrv_can_snapshot(bs)) { 1421 error_setg(errp, "Block format '%s' used by device '%s' " 1422 "does not support internal snapshots", 1423 bs->drv->format_name, device); 1424 goto out; 1425 } 1426 1427 if (!strlen(name)) { 1428 error_setg(errp, "Name is empty"); 1429 goto out; 1430 } 1431 1432 /* check whether a snapshot with name exist */ 1433 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1434 &local_err); 1435 if (local_err) { 1436 error_propagate(errp, local_err); 1437 goto out; 1438 } else if (ret) { 1439 error_setg(errp, 1440 "Snapshot with name '%s' already exists on device '%s'", 1441 name, device); 1442 goto out; 1443 } 1444 1445 /* 3. take the snapshot */ 1446 sn = &state->sn; 1447 pstrcpy(sn->name, sizeof(sn->name), name); 1448 qemu_gettimeofday(&tv); 1449 sn->date_sec = tv.tv_sec; 1450 sn->date_nsec = tv.tv_usec * 1000; 1451 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1452 1453 ret1 = bdrv_snapshot_create(bs, sn); 1454 if (ret1 < 0) { 1455 error_setg_errno(errp, -ret1, 1456 "Failed to create snapshot '%s' on device '%s'", 1457 name, device); 1458 goto out; 1459 } 1460 1461 /* 4. succeed, mark a snapshot is created */ 1462 state->created = true; 1463 1464 out: 1465 aio_context_release(aio_context); 1466 } 1467 1468 static void internal_snapshot_abort(BlkActionState *common) 1469 { 1470 InternalSnapshotState *state = 1471 DO_UPCAST(InternalSnapshotState, common, common); 1472 BlockDriverState *bs = state->bs; 1473 QEMUSnapshotInfo *sn = &state->sn; 1474 AioContext *aio_context; 1475 Error *local_error = NULL; 1476 1477 if (!state->created) { 1478 return; 1479 } 1480 1481 aio_context = bdrv_get_aio_context(state->bs); 1482 aio_context_acquire(aio_context); 1483 1484 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1485 error_reportf_err(local_error, 1486 "Failed to delete snapshot with id '%s' and " 1487 "name '%s' on device '%s' in abort: ", 1488 sn->id_str, sn->name, 1489 bdrv_get_device_name(bs)); 1490 } 1491 1492 aio_context_release(aio_context); 1493 } 1494 1495 static void internal_snapshot_clean(BlkActionState *common) 1496 { 1497 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1498 common, common); 1499 AioContext *aio_context; 1500 1501 if (!state->bs) { 1502 return; 1503 } 1504 1505 aio_context = bdrv_get_aio_context(state->bs); 1506 aio_context_acquire(aio_context); 1507 1508 bdrv_drained_end(state->bs); 1509 1510 aio_context_release(aio_context); 1511 } 1512 1513 /* external snapshot private data */ 1514 typedef struct ExternalSnapshotState { 1515 BlkActionState common; 1516 BlockDriverState *old_bs; 1517 BlockDriverState *new_bs; 1518 bool overlay_appended; 1519 } ExternalSnapshotState; 1520 1521 static void external_snapshot_prepare(BlkActionState *common, 1522 Error **errp) 1523 { 1524 int flags = 0; 1525 QDict *options = NULL; 1526 Error *local_err = NULL; 1527 /* Device and node name of the image to generate the snapshot from */ 1528 const char *device; 1529 const char *node_name; 1530 /* Reference to the new image (for 'blockdev-snapshot') */ 1531 const char *snapshot_ref; 1532 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1533 const char *new_image_file; 1534 ExternalSnapshotState *state = 1535 DO_UPCAST(ExternalSnapshotState, common, common); 1536 TransactionAction *action = common->action; 1537 AioContext *aio_context; 1538 1539 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1540 * purpose but a different set of parameters */ 1541 switch (action->type) { 1542 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1543 { 1544 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1545 device = s->node; 1546 node_name = s->node; 1547 new_image_file = NULL; 1548 snapshot_ref = s->overlay; 1549 } 1550 break; 1551 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1552 { 1553 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1554 device = s->has_device ? s->device : NULL; 1555 node_name = s->has_node_name ? s->node_name : NULL; 1556 new_image_file = s->snapshot_file; 1557 snapshot_ref = NULL; 1558 } 1559 break; 1560 default: 1561 g_assert_not_reached(); 1562 } 1563 1564 /* start processing */ 1565 if (action_check_completion_mode(common, errp) < 0) { 1566 return; 1567 } 1568 1569 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1570 if (!state->old_bs) { 1571 return; 1572 } 1573 1574 aio_context = bdrv_get_aio_context(state->old_bs); 1575 aio_context_acquire(aio_context); 1576 1577 /* Paired with .clean() */ 1578 bdrv_drained_begin(state->old_bs); 1579 1580 if (!bdrv_is_inserted(state->old_bs)) { 1581 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1582 goto out; 1583 } 1584 1585 if (bdrv_op_is_blocked(state->old_bs, 1586 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1587 goto out; 1588 } 1589 1590 if (!bdrv_is_read_only(state->old_bs)) { 1591 if (bdrv_flush(state->old_bs)) { 1592 error_setg(errp, QERR_IO_ERROR); 1593 goto out; 1594 } 1595 } 1596 1597 if (!bdrv_is_first_non_filter(state->old_bs)) { 1598 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1599 goto out; 1600 } 1601 1602 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1603 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1604 const char *format = s->has_format ? s->format : "qcow2"; 1605 enum NewImageMode mode; 1606 const char *snapshot_node_name = 1607 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1608 1609 if (node_name && !snapshot_node_name) { 1610 error_setg(errp, "New snapshot node name missing"); 1611 goto out; 1612 } 1613 1614 if (snapshot_node_name && 1615 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1616 error_setg(errp, "New snapshot node name already in use"); 1617 goto out; 1618 } 1619 1620 flags = state->old_bs->open_flags; 1621 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1622 flags |= BDRV_O_NO_BACKING; 1623 1624 /* create new image w/backing file */ 1625 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1626 if (mode != NEW_IMAGE_MODE_EXISTING) { 1627 int64_t size = bdrv_getlength(state->old_bs); 1628 if (size < 0) { 1629 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1630 goto out; 1631 } 1632 bdrv_refresh_filename(state->old_bs); 1633 bdrv_img_create(new_image_file, format, 1634 state->old_bs->filename, 1635 state->old_bs->drv->format_name, 1636 NULL, size, flags, false, &local_err); 1637 if (local_err) { 1638 error_propagate(errp, local_err); 1639 goto out; 1640 } 1641 } 1642 1643 options = qdict_new(); 1644 if (snapshot_node_name) { 1645 qdict_put_str(options, "node-name", snapshot_node_name); 1646 } 1647 qdict_put_str(options, "driver", format); 1648 } 1649 1650 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1651 errp); 1652 /* We will manually add the backing_hd field to the bs later */ 1653 if (!state->new_bs) { 1654 goto out; 1655 } 1656 1657 if (bdrv_has_blk(state->new_bs)) { 1658 error_setg(errp, "The snapshot is already in use"); 1659 goto out; 1660 } 1661 1662 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1663 errp)) { 1664 goto out; 1665 } 1666 1667 if (state->new_bs->backing != NULL) { 1668 error_setg(errp, "The snapshot already has a backing image"); 1669 goto out; 1670 } 1671 1672 if (!state->new_bs->drv->supports_backing) { 1673 error_setg(errp, "The snapshot does not support backing images"); 1674 goto out; 1675 } 1676 1677 bdrv_set_aio_context(state->new_bs, aio_context); 1678 1679 /* This removes our old bs and adds the new bs. This is an operation that 1680 * can fail, so we need to do it in .prepare; undoing it for abort is 1681 * always possible. */ 1682 bdrv_ref(state->new_bs); 1683 bdrv_append(state->new_bs, state->old_bs, &local_err); 1684 if (local_err) { 1685 error_propagate(errp, local_err); 1686 goto out; 1687 } 1688 state->overlay_appended = true; 1689 1690 out: 1691 aio_context_release(aio_context); 1692 } 1693 1694 static void external_snapshot_commit(BlkActionState *common) 1695 { 1696 ExternalSnapshotState *state = 1697 DO_UPCAST(ExternalSnapshotState, common, common); 1698 AioContext *aio_context; 1699 1700 aio_context = bdrv_get_aio_context(state->old_bs); 1701 aio_context_acquire(aio_context); 1702 1703 /* We don't need (or want) to use the transactional 1704 * bdrv_reopen_multiple() across all the entries at once, because we 1705 * don't want to abort all of them if one of them fails the reopen */ 1706 if (!atomic_read(&state->old_bs->copy_on_read)) { 1707 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1708 } 1709 1710 aio_context_release(aio_context); 1711 } 1712 1713 static void external_snapshot_abort(BlkActionState *common) 1714 { 1715 ExternalSnapshotState *state = 1716 DO_UPCAST(ExternalSnapshotState, common, common); 1717 if (state->new_bs) { 1718 if (state->overlay_appended) { 1719 AioContext *aio_context; 1720 1721 aio_context = bdrv_get_aio_context(state->old_bs); 1722 aio_context_acquire(aio_context); 1723 1724 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1725 close state->old_bs; we need it */ 1726 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1727 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1728 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1729 1730 aio_context_release(aio_context); 1731 } 1732 } 1733 } 1734 1735 static void external_snapshot_clean(BlkActionState *common) 1736 { 1737 ExternalSnapshotState *state = 1738 DO_UPCAST(ExternalSnapshotState, common, common); 1739 AioContext *aio_context; 1740 1741 if (!state->old_bs) { 1742 return; 1743 } 1744 1745 aio_context = bdrv_get_aio_context(state->old_bs); 1746 aio_context_acquire(aio_context); 1747 1748 bdrv_drained_end(state->old_bs); 1749 bdrv_unref(state->new_bs); 1750 1751 aio_context_release(aio_context); 1752 } 1753 1754 typedef struct DriveBackupState { 1755 BlkActionState common; 1756 BlockDriverState *bs; 1757 BlockJob *job; 1758 } DriveBackupState; 1759 1760 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1761 Error **errp); 1762 1763 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1764 { 1765 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1766 BlockDriverState *bs; 1767 DriveBackup *backup; 1768 AioContext *aio_context; 1769 Error *local_err = NULL; 1770 1771 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1772 backup = common->action->u.drive_backup.data; 1773 1774 bs = qmp_get_root_bs(backup->device, errp); 1775 if (!bs) { 1776 return; 1777 } 1778 1779 aio_context = bdrv_get_aio_context(bs); 1780 aio_context_acquire(aio_context); 1781 1782 /* Paired with .clean() */ 1783 bdrv_drained_begin(bs); 1784 1785 state->bs = bs; 1786 1787 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1788 if (local_err) { 1789 error_propagate(errp, local_err); 1790 goto out; 1791 } 1792 1793 out: 1794 aio_context_release(aio_context); 1795 } 1796 1797 static void drive_backup_commit(BlkActionState *common) 1798 { 1799 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1800 AioContext *aio_context; 1801 1802 aio_context = bdrv_get_aio_context(state->bs); 1803 aio_context_acquire(aio_context); 1804 1805 assert(state->job); 1806 job_start(&state->job->job); 1807 1808 aio_context_release(aio_context); 1809 } 1810 1811 static void drive_backup_abort(BlkActionState *common) 1812 { 1813 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1814 1815 if (state->job) { 1816 AioContext *aio_context; 1817 1818 aio_context = bdrv_get_aio_context(state->bs); 1819 aio_context_acquire(aio_context); 1820 1821 job_cancel_sync(&state->job->job); 1822 1823 aio_context_release(aio_context); 1824 } 1825 } 1826 1827 static void drive_backup_clean(BlkActionState *common) 1828 { 1829 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1830 AioContext *aio_context; 1831 1832 if (!state->bs) { 1833 return; 1834 } 1835 1836 aio_context = bdrv_get_aio_context(state->bs); 1837 aio_context_acquire(aio_context); 1838 1839 bdrv_drained_end(state->bs); 1840 1841 aio_context_release(aio_context); 1842 } 1843 1844 typedef struct BlockdevBackupState { 1845 BlkActionState common; 1846 BlockDriverState *bs; 1847 BlockJob *job; 1848 } BlockdevBackupState; 1849 1850 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1851 Error **errp); 1852 1853 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1854 { 1855 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1856 BlockdevBackup *backup; 1857 BlockDriverState *bs, *target; 1858 AioContext *aio_context; 1859 Error *local_err = NULL; 1860 1861 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1862 backup = common->action->u.blockdev_backup.data; 1863 1864 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1865 if (!bs) { 1866 return; 1867 } 1868 1869 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1870 if (!target) { 1871 return; 1872 } 1873 1874 aio_context = bdrv_get_aio_context(bs); 1875 if (aio_context != bdrv_get_aio_context(target)) { 1876 error_setg(errp, "Backup between two IO threads is not implemented"); 1877 return; 1878 } 1879 aio_context_acquire(aio_context); 1880 state->bs = bs; 1881 1882 /* Paired with .clean() */ 1883 bdrv_drained_begin(state->bs); 1884 1885 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1886 if (local_err) { 1887 error_propagate(errp, local_err); 1888 goto out; 1889 } 1890 1891 out: 1892 aio_context_release(aio_context); 1893 } 1894 1895 static void blockdev_backup_commit(BlkActionState *common) 1896 { 1897 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1898 AioContext *aio_context; 1899 1900 aio_context = bdrv_get_aio_context(state->bs); 1901 aio_context_acquire(aio_context); 1902 1903 assert(state->job); 1904 job_start(&state->job->job); 1905 1906 aio_context_release(aio_context); 1907 } 1908 1909 static void blockdev_backup_abort(BlkActionState *common) 1910 { 1911 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1912 1913 if (state->job) { 1914 AioContext *aio_context; 1915 1916 aio_context = bdrv_get_aio_context(state->bs); 1917 aio_context_acquire(aio_context); 1918 1919 job_cancel_sync(&state->job->job); 1920 1921 aio_context_release(aio_context); 1922 } 1923 } 1924 1925 static void blockdev_backup_clean(BlkActionState *common) 1926 { 1927 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1928 AioContext *aio_context; 1929 1930 if (!state->bs) { 1931 return; 1932 } 1933 1934 aio_context = bdrv_get_aio_context(state->bs); 1935 aio_context_acquire(aio_context); 1936 1937 bdrv_drained_end(state->bs); 1938 1939 aio_context_release(aio_context); 1940 } 1941 1942 typedef struct BlockDirtyBitmapState { 1943 BlkActionState common; 1944 BdrvDirtyBitmap *bitmap; 1945 BlockDriverState *bs; 1946 HBitmap *backup; 1947 bool prepared; 1948 bool was_enabled; 1949 } BlockDirtyBitmapState; 1950 1951 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1952 Error **errp) 1953 { 1954 Error *local_err = NULL; 1955 BlockDirtyBitmapAdd *action; 1956 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1957 common, common); 1958 1959 if (action_check_completion_mode(common, errp) < 0) { 1960 return; 1961 } 1962 1963 action = common->action->u.block_dirty_bitmap_add.data; 1964 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1965 qmp_block_dirty_bitmap_add(action->node, action->name, 1966 action->has_granularity, action->granularity, 1967 action->has_persistent, action->persistent, 1968 action->has_autoload, action->autoload, 1969 action->has_disabled, action->disabled, 1970 &local_err); 1971 1972 if (!local_err) { 1973 state->prepared = true; 1974 } else { 1975 error_propagate(errp, local_err); 1976 } 1977 } 1978 1979 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1980 { 1981 BlockDirtyBitmapAdd *action; 1982 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1983 common, common); 1984 1985 action = common->action->u.block_dirty_bitmap_add.data; 1986 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1987 * then the node reference and bitmap name must have been valid. 1988 */ 1989 if (state->prepared) { 1990 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1991 } 1992 } 1993 1994 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1995 Error **errp) 1996 { 1997 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1998 common, common); 1999 BlockDirtyBitmap *action; 2000 2001 if (action_check_completion_mode(common, errp) < 0) { 2002 return; 2003 } 2004 2005 action = common->action->u.block_dirty_bitmap_clear.data; 2006 state->bitmap = block_dirty_bitmap_lookup(action->node, 2007 action->name, 2008 &state->bs, 2009 errp); 2010 if (!state->bitmap) { 2011 return; 2012 } 2013 2014 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2015 return; 2016 } 2017 2018 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2019 } 2020 2021 static void block_dirty_bitmap_restore(BlkActionState *common) 2022 { 2023 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2024 common, common); 2025 2026 if (state->backup) { 2027 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2028 } 2029 } 2030 2031 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2032 { 2033 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2034 common, common); 2035 2036 hbitmap_free(state->backup); 2037 } 2038 2039 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2040 Error **errp) 2041 { 2042 BlockDirtyBitmap *action; 2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2044 common, common); 2045 2046 if (action_check_completion_mode(common, errp) < 0) { 2047 return; 2048 } 2049 2050 action = common->action->u.block_dirty_bitmap_enable.data; 2051 state->bitmap = block_dirty_bitmap_lookup(action->node, 2052 action->name, 2053 NULL, 2054 errp); 2055 if (!state->bitmap) { 2056 return; 2057 } 2058 2059 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2060 return; 2061 } 2062 2063 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2064 bdrv_enable_dirty_bitmap(state->bitmap); 2065 } 2066 2067 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2068 { 2069 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2070 common, common); 2071 2072 if (!state->was_enabled) { 2073 bdrv_disable_dirty_bitmap(state->bitmap); 2074 } 2075 } 2076 2077 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2078 Error **errp) 2079 { 2080 BlockDirtyBitmap *action; 2081 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2082 common, common); 2083 2084 if (action_check_completion_mode(common, errp) < 0) { 2085 return; 2086 } 2087 2088 action = common->action->u.block_dirty_bitmap_disable.data; 2089 state->bitmap = block_dirty_bitmap_lookup(action->node, 2090 action->name, 2091 NULL, 2092 errp); 2093 if (!state->bitmap) { 2094 return; 2095 } 2096 2097 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2098 return; 2099 } 2100 2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2102 bdrv_disable_dirty_bitmap(state->bitmap); 2103 } 2104 2105 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2106 { 2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2108 common, common); 2109 2110 if (state->was_enabled) { 2111 bdrv_enable_dirty_bitmap(state->bitmap); 2112 } 2113 } 2114 2115 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node, 2116 const char *target, 2117 strList *bitmaps, 2118 HBitmap **backup, 2119 Error **errp); 2120 2121 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2122 Error **errp) 2123 { 2124 BlockDirtyBitmapMerge *action; 2125 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2126 common, common); 2127 2128 if (action_check_completion_mode(common, errp) < 0) { 2129 return; 2130 } 2131 2132 action = common->action->u.block_dirty_bitmap_merge.data; 2133 2134 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2135 action->bitmaps, &state->backup, 2136 errp); 2137 } 2138 2139 static void abort_prepare(BlkActionState *common, Error **errp) 2140 { 2141 error_setg(errp, "Transaction aborted using Abort action"); 2142 } 2143 2144 static void abort_commit(BlkActionState *common) 2145 { 2146 g_assert_not_reached(); /* this action never succeeds */ 2147 } 2148 2149 static const BlkActionOps actions[] = { 2150 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2151 .instance_size = sizeof(ExternalSnapshotState), 2152 .prepare = external_snapshot_prepare, 2153 .commit = external_snapshot_commit, 2154 .abort = external_snapshot_abort, 2155 .clean = external_snapshot_clean, 2156 }, 2157 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2158 .instance_size = sizeof(ExternalSnapshotState), 2159 .prepare = external_snapshot_prepare, 2160 .commit = external_snapshot_commit, 2161 .abort = external_snapshot_abort, 2162 .clean = external_snapshot_clean, 2163 }, 2164 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2165 .instance_size = sizeof(DriveBackupState), 2166 .prepare = drive_backup_prepare, 2167 .commit = drive_backup_commit, 2168 .abort = drive_backup_abort, 2169 .clean = drive_backup_clean, 2170 }, 2171 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2172 .instance_size = sizeof(BlockdevBackupState), 2173 .prepare = blockdev_backup_prepare, 2174 .commit = blockdev_backup_commit, 2175 .abort = blockdev_backup_abort, 2176 .clean = blockdev_backup_clean, 2177 }, 2178 [TRANSACTION_ACTION_KIND_ABORT] = { 2179 .instance_size = sizeof(BlkActionState), 2180 .prepare = abort_prepare, 2181 .commit = abort_commit, 2182 }, 2183 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2184 .instance_size = sizeof(InternalSnapshotState), 2185 .prepare = internal_snapshot_prepare, 2186 .abort = internal_snapshot_abort, 2187 .clean = internal_snapshot_clean, 2188 }, 2189 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2190 .instance_size = sizeof(BlockDirtyBitmapState), 2191 .prepare = block_dirty_bitmap_add_prepare, 2192 .abort = block_dirty_bitmap_add_abort, 2193 }, 2194 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2195 .instance_size = sizeof(BlockDirtyBitmapState), 2196 .prepare = block_dirty_bitmap_clear_prepare, 2197 .commit = block_dirty_bitmap_free_backup, 2198 .abort = block_dirty_bitmap_restore, 2199 }, 2200 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2201 .instance_size = sizeof(BlockDirtyBitmapState), 2202 .prepare = block_dirty_bitmap_enable_prepare, 2203 .abort = block_dirty_bitmap_enable_abort, 2204 }, 2205 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2206 .instance_size = sizeof(BlockDirtyBitmapState), 2207 .prepare = block_dirty_bitmap_disable_prepare, 2208 .abort = block_dirty_bitmap_disable_abort, 2209 }, 2210 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2211 .instance_size = sizeof(BlockDirtyBitmapState), 2212 .prepare = block_dirty_bitmap_merge_prepare, 2213 .commit = block_dirty_bitmap_free_backup, 2214 .abort = block_dirty_bitmap_restore, 2215 }, 2216 /* Where are transactions for MIRROR, COMMIT and STREAM? 2217 * Although these blockjobs use transaction callbacks like the backup job, 2218 * these jobs do not necessarily adhere to transaction semantics. 2219 * These jobs may not fully undo all of their actions on abort, nor do they 2220 * necessarily work in transactions with more than one job in them. 2221 */ 2222 }; 2223 2224 /** 2225 * Allocate a TransactionProperties structure if necessary, and fill 2226 * that structure with desired defaults if they are unset. 2227 */ 2228 static TransactionProperties *get_transaction_properties( 2229 TransactionProperties *props) 2230 { 2231 if (!props) { 2232 props = g_new0(TransactionProperties, 1); 2233 } 2234 2235 if (!props->has_completion_mode) { 2236 props->has_completion_mode = true; 2237 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2238 } 2239 2240 return props; 2241 } 2242 2243 /* 2244 * 'Atomic' group operations. The operations are performed as a set, and if 2245 * any fail then we roll back all operations in the group. 2246 */ 2247 void qmp_transaction(TransactionActionList *dev_list, 2248 bool has_props, 2249 struct TransactionProperties *props, 2250 Error **errp) 2251 { 2252 TransactionActionList *dev_entry = dev_list; 2253 JobTxn *block_job_txn = NULL; 2254 BlkActionState *state, *next; 2255 Error *local_err = NULL; 2256 2257 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2258 QTAILQ_INIT(&snap_bdrv_states); 2259 2260 /* Does this transaction get canceled as a group on failure? 2261 * If not, we don't really need to make a JobTxn. 2262 */ 2263 props = get_transaction_properties(props); 2264 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2265 block_job_txn = job_txn_new(); 2266 } 2267 2268 /* drain all i/o before any operations */ 2269 bdrv_drain_all(); 2270 2271 /* We don't do anything in this loop that commits us to the operations */ 2272 while (NULL != dev_entry) { 2273 TransactionAction *dev_info = NULL; 2274 const BlkActionOps *ops; 2275 2276 dev_info = dev_entry->value; 2277 dev_entry = dev_entry->next; 2278 2279 assert(dev_info->type < ARRAY_SIZE(actions)); 2280 2281 ops = &actions[dev_info->type]; 2282 assert(ops->instance_size > 0); 2283 2284 state = g_malloc0(ops->instance_size); 2285 state->ops = ops; 2286 state->action = dev_info; 2287 state->block_job_txn = block_job_txn; 2288 state->txn_props = props; 2289 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2290 2291 state->ops->prepare(state, &local_err); 2292 if (local_err) { 2293 error_propagate(errp, local_err); 2294 goto delete_and_fail; 2295 } 2296 } 2297 2298 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2299 if (state->ops->commit) { 2300 state->ops->commit(state); 2301 } 2302 } 2303 2304 /* success */ 2305 goto exit; 2306 2307 delete_and_fail: 2308 /* failure, and it is all-or-none; roll back all operations */ 2309 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2310 if (state->ops->abort) { 2311 state->ops->abort(state); 2312 } 2313 } 2314 exit: 2315 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2316 if (state->ops->clean) { 2317 state->ops->clean(state); 2318 } 2319 g_free(state); 2320 } 2321 if (!has_props) { 2322 qapi_free_TransactionProperties(props); 2323 } 2324 job_txn_unref(block_job_txn); 2325 } 2326 2327 void qmp_eject(bool has_device, const char *device, 2328 bool has_id, const char *id, 2329 bool has_force, bool force, Error **errp) 2330 { 2331 Error *local_err = NULL; 2332 int rc; 2333 2334 if (!has_force) { 2335 force = false; 2336 } 2337 2338 rc = do_open_tray(has_device ? device : NULL, 2339 has_id ? id : NULL, 2340 force, &local_err); 2341 if (rc && rc != -ENOSYS) { 2342 error_propagate(errp, local_err); 2343 return; 2344 } 2345 error_free(local_err); 2346 2347 blockdev_remove_medium(has_device, device, has_id, id, errp); 2348 } 2349 2350 void qmp_block_passwd(bool has_device, const char *device, 2351 bool has_node_name, const char *node_name, 2352 const char *password, Error **errp) 2353 { 2354 error_setg(errp, 2355 "Setting block passwords directly is no longer supported"); 2356 } 2357 2358 /* 2359 * Attempt to open the tray of @device. 2360 * If @force, ignore its tray lock. 2361 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2362 * On error, store an error through @errp and return -errno. 2363 * If @device does not exist, return -ENODEV. 2364 * If it has no removable media, return -ENOTSUP. 2365 * If it has no tray, return -ENOSYS. 2366 * If the guest was asked to open the tray, return -EINPROGRESS. 2367 * Else, return 0. 2368 */ 2369 static int do_open_tray(const char *blk_name, const char *qdev_id, 2370 bool force, Error **errp) 2371 { 2372 BlockBackend *blk; 2373 const char *device = qdev_id ?: blk_name; 2374 bool locked; 2375 2376 blk = qmp_get_blk(blk_name, qdev_id, errp); 2377 if (!blk) { 2378 return -ENODEV; 2379 } 2380 2381 if (!blk_dev_has_removable_media(blk)) { 2382 error_setg(errp, "Device '%s' is not removable", device); 2383 return -ENOTSUP; 2384 } 2385 2386 if (!blk_dev_has_tray(blk)) { 2387 error_setg(errp, "Device '%s' does not have a tray", device); 2388 return -ENOSYS; 2389 } 2390 2391 if (blk_dev_is_tray_open(blk)) { 2392 return 0; 2393 } 2394 2395 locked = blk_dev_is_medium_locked(blk); 2396 if (locked) { 2397 blk_dev_eject_request(blk, force); 2398 } 2399 2400 if (!locked || force) { 2401 blk_dev_change_media_cb(blk, false, &error_abort); 2402 } 2403 2404 if (locked && !force) { 2405 error_setg(errp, "Device '%s' is locked and force was not specified, " 2406 "wait for tray to open and try again", device); 2407 return -EINPROGRESS; 2408 } 2409 2410 return 0; 2411 } 2412 2413 void qmp_blockdev_open_tray(bool has_device, const char *device, 2414 bool has_id, const char *id, 2415 bool has_force, bool force, 2416 Error **errp) 2417 { 2418 Error *local_err = NULL; 2419 int rc; 2420 2421 if (!has_force) { 2422 force = false; 2423 } 2424 rc = do_open_tray(has_device ? device : NULL, 2425 has_id ? id : NULL, 2426 force, &local_err); 2427 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2428 error_propagate(errp, local_err); 2429 return; 2430 } 2431 error_free(local_err); 2432 } 2433 2434 void qmp_blockdev_close_tray(bool has_device, const char *device, 2435 bool has_id, const char *id, 2436 Error **errp) 2437 { 2438 BlockBackend *blk; 2439 Error *local_err = NULL; 2440 2441 device = has_device ? device : NULL; 2442 id = has_id ? id : NULL; 2443 2444 blk = qmp_get_blk(device, id, errp); 2445 if (!blk) { 2446 return; 2447 } 2448 2449 if (!blk_dev_has_removable_media(blk)) { 2450 error_setg(errp, "Device '%s' is not removable", device ?: id); 2451 return; 2452 } 2453 2454 if (!blk_dev_has_tray(blk)) { 2455 /* Ignore this command on tray-less devices */ 2456 return; 2457 } 2458 2459 if (!blk_dev_is_tray_open(blk)) { 2460 return; 2461 } 2462 2463 blk_dev_change_media_cb(blk, true, &local_err); 2464 if (local_err) { 2465 error_propagate(errp, local_err); 2466 return; 2467 } 2468 } 2469 2470 static void blockdev_remove_medium(bool has_device, const char *device, 2471 bool has_id, const char *id, Error **errp) 2472 { 2473 BlockBackend *blk; 2474 BlockDriverState *bs; 2475 AioContext *aio_context; 2476 bool has_attached_device; 2477 2478 device = has_device ? device : NULL; 2479 id = has_id ? id : NULL; 2480 2481 blk = qmp_get_blk(device, id, errp); 2482 if (!blk) { 2483 return; 2484 } 2485 2486 /* For BBs without a device, we can exchange the BDS tree at will */ 2487 has_attached_device = blk_get_attached_dev(blk); 2488 2489 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2490 error_setg(errp, "Device '%s' is not removable", device ?: id); 2491 return; 2492 } 2493 2494 if (has_attached_device && blk_dev_has_tray(blk) && 2495 !blk_dev_is_tray_open(blk)) 2496 { 2497 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2498 return; 2499 } 2500 2501 bs = blk_bs(blk); 2502 if (!bs) { 2503 return; 2504 } 2505 2506 aio_context = bdrv_get_aio_context(bs); 2507 aio_context_acquire(aio_context); 2508 2509 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2510 goto out; 2511 } 2512 2513 blk_remove_bs(blk); 2514 2515 if (!blk_dev_has_tray(blk)) { 2516 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2517 * called at all); therefore, the medium needs to be ejected here. 2518 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2519 * value passed here (i.e. false). */ 2520 blk_dev_change_media_cb(blk, false, &error_abort); 2521 } 2522 2523 out: 2524 aio_context_release(aio_context); 2525 } 2526 2527 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2528 { 2529 blockdev_remove_medium(false, NULL, true, id, errp); 2530 } 2531 2532 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2533 BlockDriverState *bs, Error **errp) 2534 { 2535 Error *local_err = NULL; 2536 bool has_device; 2537 int ret; 2538 2539 /* For BBs without a device, we can exchange the BDS tree at will */ 2540 has_device = blk_get_attached_dev(blk); 2541 2542 if (has_device && !blk_dev_has_removable_media(blk)) { 2543 error_setg(errp, "Device is not removable"); 2544 return; 2545 } 2546 2547 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2548 error_setg(errp, "Tray of the device is not open"); 2549 return; 2550 } 2551 2552 if (blk_bs(blk)) { 2553 error_setg(errp, "There already is a medium in the device"); 2554 return; 2555 } 2556 2557 ret = blk_insert_bs(blk, bs, errp); 2558 if (ret < 0) { 2559 return; 2560 } 2561 2562 if (!blk_dev_has_tray(blk)) { 2563 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2564 * called at all); therefore, the medium needs to be pushed into the 2565 * slot here. 2566 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2567 * value passed here (i.e. true). */ 2568 blk_dev_change_media_cb(blk, true, &local_err); 2569 if (local_err) { 2570 error_propagate(errp, local_err); 2571 blk_remove_bs(blk); 2572 return; 2573 } 2574 } 2575 } 2576 2577 static void blockdev_insert_medium(bool has_device, const char *device, 2578 bool has_id, const char *id, 2579 const char *node_name, Error **errp) 2580 { 2581 BlockBackend *blk; 2582 BlockDriverState *bs; 2583 2584 blk = qmp_get_blk(has_device ? device : NULL, 2585 has_id ? id : NULL, 2586 errp); 2587 if (!blk) { 2588 return; 2589 } 2590 2591 bs = bdrv_find_node(node_name); 2592 if (!bs) { 2593 error_setg(errp, "Node '%s' not found", node_name); 2594 return; 2595 } 2596 2597 if (bdrv_has_blk(bs)) { 2598 error_setg(errp, "Node '%s' is already in use", node_name); 2599 return; 2600 } 2601 2602 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2603 } 2604 2605 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2606 Error **errp) 2607 { 2608 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2609 } 2610 2611 void qmp_blockdev_change_medium(bool has_device, const char *device, 2612 bool has_id, const char *id, 2613 const char *filename, 2614 bool has_format, const char *format, 2615 bool has_read_only, 2616 BlockdevChangeReadOnlyMode read_only, 2617 Error **errp) 2618 { 2619 BlockBackend *blk; 2620 BlockDriverState *medium_bs = NULL; 2621 int bdrv_flags; 2622 bool detect_zeroes; 2623 int rc; 2624 QDict *options = NULL; 2625 Error *err = NULL; 2626 2627 blk = qmp_get_blk(has_device ? device : NULL, 2628 has_id ? id : NULL, 2629 errp); 2630 if (!blk) { 2631 goto fail; 2632 } 2633 2634 if (blk_bs(blk)) { 2635 blk_update_root_state(blk); 2636 } 2637 2638 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2639 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2640 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2641 2642 if (!has_read_only) { 2643 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2644 } 2645 2646 switch (read_only) { 2647 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2648 break; 2649 2650 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2651 bdrv_flags &= ~BDRV_O_RDWR; 2652 break; 2653 2654 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2655 bdrv_flags |= BDRV_O_RDWR; 2656 break; 2657 2658 default: 2659 abort(); 2660 } 2661 2662 options = qdict_new(); 2663 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2664 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2665 2666 if (has_format) { 2667 qdict_put_str(options, "driver", format); 2668 } 2669 2670 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2671 if (!medium_bs) { 2672 goto fail; 2673 } 2674 2675 rc = do_open_tray(has_device ? device : NULL, 2676 has_id ? id : NULL, 2677 false, &err); 2678 if (rc && rc != -ENOSYS) { 2679 error_propagate(errp, err); 2680 goto fail; 2681 } 2682 error_free(err); 2683 err = NULL; 2684 2685 blockdev_remove_medium(has_device, device, has_id, id, &err); 2686 if (err) { 2687 error_propagate(errp, err); 2688 goto fail; 2689 } 2690 2691 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2692 if (err) { 2693 error_propagate(errp, err); 2694 goto fail; 2695 } 2696 2697 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2698 2699 fail: 2700 /* If the medium has been inserted, the device has its own reference, so 2701 * ours must be relinquished; and if it has not been inserted successfully, 2702 * the reference must be relinquished anyway */ 2703 bdrv_unref(medium_bs); 2704 } 2705 2706 /* throttling disk I/O limits */ 2707 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2708 { 2709 ThrottleConfig cfg; 2710 BlockDriverState *bs; 2711 BlockBackend *blk; 2712 AioContext *aio_context; 2713 2714 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2715 arg->has_id ? arg->id : NULL, 2716 errp); 2717 if (!blk) { 2718 return; 2719 } 2720 2721 aio_context = blk_get_aio_context(blk); 2722 aio_context_acquire(aio_context); 2723 2724 bs = blk_bs(blk); 2725 if (!bs) { 2726 error_setg(errp, "Device has no medium"); 2727 goto out; 2728 } 2729 2730 throttle_config_init(&cfg); 2731 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2732 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2733 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2734 2735 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2736 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2737 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2738 2739 if (arg->has_bps_max) { 2740 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2741 } 2742 if (arg->has_bps_rd_max) { 2743 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2744 } 2745 if (arg->has_bps_wr_max) { 2746 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2747 } 2748 if (arg->has_iops_max) { 2749 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2750 } 2751 if (arg->has_iops_rd_max) { 2752 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2753 } 2754 if (arg->has_iops_wr_max) { 2755 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2756 } 2757 2758 if (arg->has_bps_max_length) { 2759 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2760 } 2761 if (arg->has_bps_rd_max_length) { 2762 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2763 } 2764 if (arg->has_bps_wr_max_length) { 2765 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2766 } 2767 if (arg->has_iops_max_length) { 2768 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2769 } 2770 if (arg->has_iops_rd_max_length) { 2771 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2772 } 2773 if (arg->has_iops_wr_max_length) { 2774 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2775 } 2776 2777 if (arg->has_iops_size) { 2778 cfg.op_size = arg->iops_size; 2779 } 2780 2781 if (!throttle_is_valid(&cfg, errp)) { 2782 goto out; 2783 } 2784 2785 if (throttle_enabled(&cfg)) { 2786 /* Enable I/O limits if they're not enabled yet, otherwise 2787 * just update the throttling group. */ 2788 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2789 blk_io_limits_enable(blk, 2790 arg->has_group ? arg->group : 2791 arg->has_device ? arg->device : 2792 arg->id); 2793 } else if (arg->has_group) { 2794 blk_io_limits_update_group(blk, arg->group); 2795 } 2796 /* Set the new throttling configuration */ 2797 blk_set_io_limits(blk, &cfg); 2798 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2799 /* If all throttling settings are set to 0, disable I/O limits */ 2800 blk_io_limits_disable(blk); 2801 } 2802 2803 out: 2804 aio_context_release(aio_context); 2805 } 2806 2807 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2808 bool has_granularity, uint32_t granularity, 2809 bool has_persistent, bool persistent, 2810 bool has_autoload, bool autoload, 2811 bool has_disabled, bool disabled, 2812 Error **errp) 2813 { 2814 BlockDriverState *bs; 2815 BdrvDirtyBitmap *bitmap; 2816 AioContext *aio_context = NULL; 2817 2818 if (!name || name[0] == '\0') { 2819 error_setg(errp, "Bitmap name cannot be empty"); 2820 return; 2821 } 2822 2823 bs = bdrv_lookup_bs(node, node, errp); 2824 if (!bs) { 2825 return; 2826 } 2827 2828 if (has_granularity) { 2829 if (granularity < 512 || !is_power_of_2(granularity)) { 2830 error_setg(errp, "Granularity must be power of 2 " 2831 "and at least 512"); 2832 return; 2833 } 2834 } else { 2835 /* Default to cluster size, if available: */ 2836 granularity = bdrv_get_default_bitmap_granularity(bs); 2837 } 2838 2839 if (!has_persistent) { 2840 persistent = false; 2841 } 2842 2843 if (has_autoload) { 2844 warn_report("Autoload option is deprecated and its value is ignored"); 2845 } 2846 2847 if (!has_disabled) { 2848 disabled = false; 2849 } 2850 2851 if (persistent) { 2852 aio_context = bdrv_get_aio_context(bs); 2853 aio_context_acquire(aio_context); 2854 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2855 goto out; 2856 } 2857 } 2858 2859 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2860 if (bitmap == NULL) { 2861 goto out; 2862 } 2863 2864 if (disabled) { 2865 bdrv_disable_dirty_bitmap(bitmap); 2866 } 2867 2868 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2869 out: 2870 if (aio_context) { 2871 aio_context_release(aio_context); 2872 } 2873 } 2874 2875 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2876 Error **errp) 2877 { 2878 BlockDriverState *bs; 2879 BdrvDirtyBitmap *bitmap; 2880 Error *local_err = NULL; 2881 AioContext *aio_context = NULL; 2882 2883 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2884 if (!bitmap || !bs) { 2885 return; 2886 } 2887 2888 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2889 errp)) { 2890 return; 2891 } 2892 2893 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2894 aio_context = bdrv_get_aio_context(bs); 2895 aio_context_acquire(aio_context); 2896 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2897 if (local_err != NULL) { 2898 error_propagate(errp, local_err); 2899 goto out; 2900 } 2901 } 2902 2903 bdrv_release_dirty_bitmap(bs, bitmap); 2904 out: 2905 if (aio_context) { 2906 aio_context_release(aio_context); 2907 } 2908 } 2909 2910 /** 2911 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2912 * immediately after a full backup operation. 2913 */ 2914 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2915 Error **errp) 2916 { 2917 BdrvDirtyBitmap *bitmap; 2918 BlockDriverState *bs; 2919 2920 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2921 if (!bitmap || !bs) { 2922 return; 2923 } 2924 2925 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2926 return; 2927 } 2928 2929 bdrv_clear_dirty_bitmap(bitmap, NULL); 2930 } 2931 2932 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2933 Error **errp) 2934 { 2935 BlockDriverState *bs; 2936 BdrvDirtyBitmap *bitmap; 2937 2938 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2939 if (!bitmap) { 2940 return; 2941 } 2942 2943 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2944 return; 2945 } 2946 2947 bdrv_enable_dirty_bitmap(bitmap); 2948 } 2949 2950 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2951 Error **errp) 2952 { 2953 BlockDriverState *bs; 2954 BdrvDirtyBitmap *bitmap; 2955 2956 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2957 if (!bitmap) { 2958 return; 2959 } 2960 2961 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2962 return; 2963 } 2964 2965 bdrv_disable_dirty_bitmap(bitmap); 2966 } 2967 2968 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node, 2969 const char *target, 2970 strList *bitmaps, 2971 HBitmap **backup, 2972 Error **errp) 2973 { 2974 BlockDriverState *bs; 2975 BdrvDirtyBitmap *dst, *src, *anon; 2976 strList *lst; 2977 Error *local_err = NULL; 2978 2979 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 2980 if (!dst) { 2981 return NULL; 2982 } 2983 2984 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 2985 NULL, errp); 2986 if (!anon) { 2987 return NULL; 2988 } 2989 2990 for (lst = bitmaps; lst; lst = lst->next) { 2991 src = bdrv_find_dirty_bitmap(bs, lst->value); 2992 if (!src) { 2993 error_setg(errp, "Dirty bitmap '%s' not found", lst->value); 2994 dst = NULL; 2995 goto out; 2996 } 2997 2998 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 2999 if (local_err) { 3000 error_propagate(errp, local_err); 3001 dst = NULL; 3002 goto out; 3003 } 3004 } 3005 3006 /* Merge into dst; dst is unchanged on failure. */ 3007 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3008 3009 out: 3010 bdrv_release_dirty_bitmap(bs, anon); 3011 return dst; 3012 } 3013 3014 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3015 strList *bitmaps, Error **errp) 3016 { 3017 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3018 } 3019 3020 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3021 const char *name, 3022 Error **errp) 3023 { 3024 BdrvDirtyBitmap *bitmap; 3025 BlockDriverState *bs; 3026 BlockDirtyBitmapSha256 *ret = NULL; 3027 char *sha256; 3028 3029 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3030 if (!bitmap || !bs) { 3031 return NULL; 3032 } 3033 3034 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3035 if (sha256 == NULL) { 3036 return NULL; 3037 } 3038 3039 ret = g_new(BlockDirtyBitmapSha256, 1); 3040 ret->sha256 = sha256; 3041 3042 return ret; 3043 } 3044 3045 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3046 { 3047 const char *id = qdict_get_str(qdict, "id"); 3048 BlockBackend *blk; 3049 BlockDriverState *bs; 3050 AioContext *aio_context; 3051 Error *local_err = NULL; 3052 3053 bs = bdrv_find_node(id); 3054 if (bs) { 3055 qmp_blockdev_del(id, &local_err); 3056 if (local_err) { 3057 error_report_err(local_err); 3058 } 3059 return; 3060 } 3061 3062 blk = blk_by_name(id); 3063 if (!blk) { 3064 error_report("Device '%s' not found", id); 3065 return; 3066 } 3067 3068 if (!blk_legacy_dinfo(blk)) { 3069 error_report("Deleting device added with blockdev-add" 3070 " is not supported"); 3071 return; 3072 } 3073 3074 aio_context = blk_get_aio_context(blk); 3075 aio_context_acquire(aio_context); 3076 3077 bs = blk_bs(blk); 3078 if (bs) { 3079 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3080 error_report_err(local_err); 3081 aio_context_release(aio_context); 3082 return; 3083 } 3084 3085 blk_remove_bs(blk); 3086 } 3087 3088 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3089 monitor_remove_blk(blk); 3090 3091 /* If this BlockBackend has a device attached to it, its refcount will be 3092 * decremented when the device is removed; otherwise we have to do so here. 3093 */ 3094 if (blk_get_attached_dev(blk)) { 3095 /* Further I/O must not pause the guest */ 3096 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3097 BLOCKDEV_ON_ERROR_REPORT); 3098 } else { 3099 blk_unref(blk); 3100 } 3101 3102 aio_context_release(aio_context); 3103 } 3104 3105 void qmp_block_resize(bool has_device, const char *device, 3106 bool has_node_name, const char *node_name, 3107 int64_t size, Error **errp) 3108 { 3109 Error *local_err = NULL; 3110 BlockBackend *blk = NULL; 3111 BlockDriverState *bs; 3112 AioContext *aio_context; 3113 int ret; 3114 3115 bs = bdrv_lookup_bs(has_device ? device : NULL, 3116 has_node_name ? node_name : NULL, 3117 &local_err); 3118 if (local_err) { 3119 error_propagate(errp, local_err); 3120 return; 3121 } 3122 3123 aio_context = bdrv_get_aio_context(bs); 3124 aio_context_acquire(aio_context); 3125 3126 if (!bdrv_is_first_non_filter(bs)) { 3127 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3128 goto out; 3129 } 3130 3131 if (size < 0) { 3132 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3133 goto out; 3134 } 3135 3136 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3137 error_setg(errp, QERR_DEVICE_IN_USE, device); 3138 goto out; 3139 } 3140 3141 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3142 ret = blk_insert_bs(blk, bs, errp); 3143 if (ret < 0) { 3144 goto out; 3145 } 3146 3147 bdrv_drained_begin(bs); 3148 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3149 bdrv_drained_end(bs); 3150 3151 out: 3152 blk_unref(blk); 3153 aio_context_release(aio_context); 3154 } 3155 3156 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3157 bool has_base, const char *base, 3158 bool has_base_node, const char *base_node, 3159 bool has_backing_file, const char *backing_file, 3160 bool has_speed, int64_t speed, 3161 bool has_on_error, BlockdevOnError on_error, 3162 bool has_auto_finalize, bool auto_finalize, 3163 bool has_auto_dismiss, bool auto_dismiss, 3164 Error **errp) 3165 { 3166 BlockDriverState *bs, *iter; 3167 BlockDriverState *base_bs = NULL; 3168 AioContext *aio_context; 3169 Error *local_err = NULL; 3170 const char *base_name = NULL; 3171 int job_flags = JOB_DEFAULT; 3172 3173 if (!has_on_error) { 3174 on_error = BLOCKDEV_ON_ERROR_REPORT; 3175 } 3176 3177 bs = bdrv_lookup_bs(device, device, errp); 3178 if (!bs) { 3179 return; 3180 } 3181 3182 aio_context = bdrv_get_aio_context(bs); 3183 aio_context_acquire(aio_context); 3184 3185 if (has_base && has_base_node) { 3186 error_setg(errp, "'base' and 'base-node' cannot be specified " 3187 "at the same time"); 3188 goto out; 3189 } 3190 3191 if (has_base) { 3192 base_bs = bdrv_find_backing_image(bs, base); 3193 if (base_bs == NULL) { 3194 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3195 goto out; 3196 } 3197 assert(bdrv_get_aio_context(base_bs) == aio_context); 3198 base_name = base; 3199 } 3200 3201 if (has_base_node) { 3202 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3203 if (!base_bs) { 3204 goto out; 3205 } 3206 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3207 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3208 base_node, device); 3209 goto out; 3210 } 3211 assert(bdrv_get_aio_context(base_bs) == aio_context); 3212 bdrv_refresh_filename(base_bs); 3213 base_name = base_bs->filename; 3214 } 3215 3216 /* Check for op blockers in the whole chain between bs and base */ 3217 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3218 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3219 goto out; 3220 } 3221 } 3222 3223 /* if we are streaming the entire chain, the result will have no backing 3224 * file, and specifying one is therefore an error */ 3225 if (base_bs == NULL && has_backing_file) { 3226 error_setg(errp, "backing file specified, but streaming the " 3227 "entire chain"); 3228 goto out; 3229 } 3230 3231 /* backing_file string overrides base bs filename */ 3232 base_name = has_backing_file ? backing_file : base_name; 3233 3234 if (has_auto_finalize && !auto_finalize) { 3235 job_flags |= JOB_MANUAL_FINALIZE; 3236 } 3237 if (has_auto_dismiss && !auto_dismiss) { 3238 job_flags |= JOB_MANUAL_DISMISS; 3239 } 3240 3241 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3242 job_flags, has_speed ? speed : 0, on_error, &local_err); 3243 if (local_err) { 3244 error_propagate(errp, local_err); 3245 goto out; 3246 } 3247 3248 trace_qmp_block_stream(bs, bs->job); 3249 3250 out: 3251 aio_context_release(aio_context); 3252 } 3253 3254 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3255 bool has_base_node, const char *base_node, 3256 bool has_base, const char *base, 3257 bool has_top_node, const char *top_node, 3258 bool has_top, const char *top, 3259 bool has_backing_file, const char *backing_file, 3260 bool has_speed, int64_t speed, 3261 bool has_filter_node_name, const char *filter_node_name, 3262 bool has_auto_finalize, bool auto_finalize, 3263 bool has_auto_dismiss, bool auto_dismiss, 3264 Error **errp) 3265 { 3266 BlockDriverState *bs; 3267 BlockDriverState *iter; 3268 BlockDriverState *base_bs, *top_bs; 3269 AioContext *aio_context; 3270 Error *local_err = NULL; 3271 /* This will be part of the QMP command, if/when the 3272 * BlockdevOnError change for blkmirror makes it in 3273 */ 3274 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3275 int job_flags = JOB_DEFAULT; 3276 3277 if (!has_speed) { 3278 speed = 0; 3279 } 3280 if (!has_filter_node_name) { 3281 filter_node_name = NULL; 3282 } 3283 if (has_auto_finalize && !auto_finalize) { 3284 job_flags |= JOB_MANUAL_FINALIZE; 3285 } 3286 if (has_auto_dismiss && !auto_dismiss) { 3287 job_flags |= JOB_MANUAL_DISMISS; 3288 } 3289 3290 /* Important Note: 3291 * libvirt relies on the DeviceNotFound error class in order to probe for 3292 * live commit feature versions; for this to work, we must make sure to 3293 * perform the device lookup before any generic errors that may occur in a 3294 * scenario in which all optional arguments are omitted. */ 3295 bs = qmp_get_root_bs(device, &local_err); 3296 if (!bs) { 3297 bs = bdrv_lookup_bs(device, device, NULL); 3298 if (!bs) { 3299 error_free(local_err); 3300 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3301 "Device '%s' not found", device); 3302 } else { 3303 error_propagate(errp, local_err); 3304 } 3305 return; 3306 } 3307 3308 aio_context = bdrv_get_aio_context(bs); 3309 aio_context_acquire(aio_context); 3310 3311 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3312 goto out; 3313 } 3314 3315 /* default top_bs is the active layer */ 3316 top_bs = bs; 3317 3318 if (has_top_node && has_top) { 3319 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3320 goto out; 3321 } else if (has_top_node) { 3322 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3323 if (top_bs == NULL) { 3324 goto out; 3325 } 3326 if (!bdrv_chain_contains(bs, top_bs)) { 3327 error_setg(errp, "'%s' is not in this backing file chain", 3328 top_node); 3329 goto out; 3330 } 3331 } else if (has_top && top) { 3332 /* This strcmp() is just a shortcut, there is no need to 3333 * refresh @bs's filename. If it mismatches, 3334 * bdrv_find_backing_image() will do the refresh and may still 3335 * return @bs. */ 3336 if (strcmp(bs->filename, top) != 0) { 3337 top_bs = bdrv_find_backing_image(bs, top); 3338 } 3339 } 3340 3341 if (top_bs == NULL) { 3342 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3343 goto out; 3344 } 3345 3346 assert(bdrv_get_aio_context(top_bs) == aio_context); 3347 3348 if (has_base_node && has_base) { 3349 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3350 goto out; 3351 } else if (has_base_node) { 3352 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3353 if (base_bs == NULL) { 3354 goto out; 3355 } 3356 if (!bdrv_chain_contains(top_bs, base_bs)) { 3357 error_setg(errp, "'%s' is not in this backing file chain", 3358 base_node); 3359 goto out; 3360 } 3361 } else if (has_base && base) { 3362 base_bs = bdrv_find_backing_image(top_bs, base); 3363 } else { 3364 base_bs = bdrv_find_base(top_bs); 3365 } 3366 3367 if (base_bs == NULL) { 3368 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3369 goto out; 3370 } 3371 3372 assert(bdrv_get_aio_context(base_bs) == aio_context); 3373 3374 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3375 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3376 goto out; 3377 } 3378 } 3379 3380 /* Do not allow attempts to commit an image into itself */ 3381 if (top_bs == base_bs) { 3382 error_setg(errp, "cannot commit an image into itself"); 3383 goto out; 3384 } 3385 3386 if (top_bs == bs) { 3387 if (has_backing_file) { 3388 error_setg(errp, "'backing-file' specified," 3389 " but 'top' is the active layer"); 3390 goto out; 3391 } 3392 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3393 job_flags, speed, on_error, 3394 filter_node_name, NULL, NULL, false, &local_err); 3395 } else { 3396 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3397 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3398 goto out; 3399 } 3400 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3401 speed, on_error, has_backing_file ? backing_file : NULL, 3402 filter_node_name, &local_err); 3403 } 3404 if (local_err != NULL) { 3405 error_propagate(errp, local_err); 3406 goto out; 3407 } 3408 3409 out: 3410 aio_context_release(aio_context); 3411 } 3412 3413 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3414 Error **errp) 3415 { 3416 BlockDriverState *bs; 3417 BlockDriverState *target_bs; 3418 BlockDriverState *source = NULL; 3419 BlockJob *job = NULL; 3420 BdrvDirtyBitmap *bmap = NULL; 3421 AioContext *aio_context; 3422 QDict *options = NULL; 3423 Error *local_err = NULL; 3424 int flags, job_flags = JOB_DEFAULT; 3425 int64_t size; 3426 bool set_backing_hd = false; 3427 3428 if (!backup->has_speed) { 3429 backup->speed = 0; 3430 } 3431 if (!backup->has_on_source_error) { 3432 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3433 } 3434 if (!backup->has_on_target_error) { 3435 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3436 } 3437 if (!backup->has_mode) { 3438 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3439 } 3440 if (!backup->has_job_id) { 3441 backup->job_id = NULL; 3442 } 3443 if (!backup->has_auto_finalize) { 3444 backup->auto_finalize = true; 3445 } 3446 if (!backup->has_auto_dismiss) { 3447 backup->auto_dismiss = true; 3448 } 3449 if (!backup->has_compress) { 3450 backup->compress = false; 3451 } 3452 3453 bs = qmp_get_root_bs(backup->device, errp); 3454 if (!bs) { 3455 return NULL; 3456 } 3457 3458 aio_context = bdrv_get_aio_context(bs); 3459 aio_context_acquire(aio_context); 3460 3461 if (!backup->has_format) { 3462 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3463 NULL : (char*) bs->drv->format_name; 3464 } 3465 3466 /* Early check to avoid creating target */ 3467 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3468 goto out; 3469 } 3470 3471 flags = bs->open_flags | BDRV_O_RDWR; 3472 3473 /* See if we have a backing HD we can use to create our new image 3474 * on top of. */ 3475 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3476 source = backing_bs(bs); 3477 if (!source) { 3478 backup->sync = MIRROR_SYNC_MODE_FULL; 3479 } 3480 } 3481 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3482 source = bs; 3483 flags |= BDRV_O_NO_BACKING; 3484 set_backing_hd = true; 3485 } 3486 3487 size = bdrv_getlength(bs); 3488 if (size < 0) { 3489 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3490 goto out; 3491 } 3492 3493 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3494 assert(backup->format); 3495 if (source) { 3496 bdrv_refresh_filename(source); 3497 bdrv_img_create(backup->target, backup->format, source->filename, 3498 source->drv->format_name, NULL, 3499 size, flags, false, &local_err); 3500 } else { 3501 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3502 size, flags, false, &local_err); 3503 } 3504 } 3505 3506 if (local_err) { 3507 error_propagate(errp, local_err); 3508 goto out; 3509 } 3510 3511 if (backup->format) { 3512 if (!options) { 3513 options = qdict_new(); 3514 } 3515 qdict_put_str(options, "driver", backup->format); 3516 } 3517 3518 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3519 if (!target_bs) { 3520 goto out; 3521 } 3522 3523 bdrv_set_aio_context(target_bs, aio_context); 3524 3525 if (set_backing_hd) { 3526 bdrv_set_backing_hd(target_bs, source, &local_err); 3527 if (local_err) { 3528 bdrv_unref(target_bs); 3529 goto out; 3530 } 3531 } 3532 3533 if (backup->has_bitmap) { 3534 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3535 if (!bmap) { 3536 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3537 bdrv_unref(target_bs); 3538 goto out; 3539 } 3540 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3541 goto out; 3542 } 3543 } 3544 if (!backup->auto_finalize) { 3545 job_flags |= JOB_MANUAL_FINALIZE; 3546 } 3547 if (!backup->auto_dismiss) { 3548 job_flags |= JOB_MANUAL_DISMISS; 3549 } 3550 3551 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3552 backup->sync, bmap, backup->compress, 3553 backup->on_source_error, backup->on_target_error, 3554 job_flags, NULL, NULL, txn, &local_err); 3555 bdrv_unref(target_bs); 3556 if (local_err != NULL) { 3557 error_propagate(errp, local_err); 3558 goto out; 3559 } 3560 3561 out: 3562 aio_context_release(aio_context); 3563 return job; 3564 } 3565 3566 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3567 { 3568 3569 BlockJob *job; 3570 job = do_drive_backup(arg, NULL, errp); 3571 if (job) { 3572 job_start(&job->job); 3573 } 3574 } 3575 3576 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3577 { 3578 return bdrv_named_nodes_list(errp); 3579 } 3580 3581 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3582 { 3583 return bdrv_get_xdbg_block_graph(errp); 3584 } 3585 3586 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3587 Error **errp) 3588 { 3589 BlockDriverState *bs; 3590 BlockDriverState *target_bs; 3591 Error *local_err = NULL; 3592 BdrvDirtyBitmap *bmap = NULL; 3593 AioContext *aio_context; 3594 BlockJob *job = NULL; 3595 int job_flags = JOB_DEFAULT; 3596 3597 if (!backup->has_speed) { 3598 backup->speed = 0; 3599 } 3600 if (!backup->has_on_source_error) { 3601 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3602 } 3603 if (!backup->has_on_target_error) { 3604 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3605 } 3606 if (!backup->has_job_id) { 3607 backup->job_id = NULL; 3608 } 3609 if (!backup->has_auto_finalize) { 3610 backup->auto_finalize = true; 3611 } 3612 if (!backup->has_auto_dismiss) { 3613 backup->auto_dismiss = true; 3614 } 3615 if (!backup->has_compress) { 3616 backup->compress = false; 3617 } 3618 3619 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3620 if (!bs) { 3621 return NULL; 3622 } 3623 3624 aio_context = bdrv_get_aio_context(bs); 3625 aio_context_acquire(aio_context); 3626 3627 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3628 if (!target_bs) { 3629 goto out; 3630 } 3631 3632 if (bdrv_get_aio_context(target_bs) != aio_context) { 3633 if (!bdrv_has_blk(target_bs)) { 3634 /* The target BDS is not attached, we can safely move it to another 3635 * AioContext. */ 3636 bdrv_set_aio_context(target_bs, aio_context); 3637 } else { 3638 error_setg(errp, "Target is attached to a different thread from " 3639 "source."); 3640 goto out; 3641 } 3642 } 3643 3644 if (backup->has_bitmap) { 3645 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3646 if (!bmap) { 3647 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3648 goto out; 3649 } 3650 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3651 goto out; 3652 } 3653 } 3654 3655 if (!backup->auto_finalize) { 3656 job_flags |= JOB_MANUAL_FINALIZE; 3657 } 3658 if (!backup->auto_dismiss) { 3659 job_flags |= JOB_MANUAL_DISMISS; 3660 } 3661 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3662 backup->sync, bmap, backup->compress, 3663 backup->on_source_error, backup->on_target_error, 3664 job_flags, NULL, NULL, txn, &local_err); 3665 if (local_err != NULL) { 3666 error_propagate(errp, local_err); 3667 } 3668 out: 3669 aio_context_release(aio_context); 3670 return job; 3671 } 3672 3673 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3674 { 3675 BlockJob *job; 3676 job = do_blockdev_backup(arg, NULL, errp); 3677 if (job) { 3678 job_start(&job->job); 3679 } 3680 } 3681 3682 /* Parameter check and block job starting for drive mirroring. 3683 * Caller should hold @device and @target's aio context (must be the same). 3684 **/ 3685 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3686 BlockDriverState *target, 3687 bool has_replaces, const char *replaces, 3688 enum MirrorSyncMode sync, 3689 BlockMirrorBackingMode backing_mode, 3690 bool has_speed, int64_t speed, 3691 bool has_granularity, uint32_t granularity, 3692 bool has_buf_size, int64_t buf_size, 3693 bool has_on_source_error, 3694 BlockdevOnError on_source_error, 3695 bool has_on_target_error, 3696 BlockdevOnError on_target_error, 3697 bool has_unmap, bool unmap, 3698 bool has_filter_node_name, 3699 const char *filter_node_name, 3700 bool has_copy_mode, MirrorCopyMode copy_mode, 3701 bool has_auto_finalize, bool auto_finalize, 3702 bool has_auto_dismiss, bool auto_dismiss, 3703 Error **errp) 3704 { 3705 int job_flags = JOB_DEFAULT; 3706 3707 if (!has_speed) { 3708 speed = 0; 3709 } 3710 if (!has_on_source_error) { 3711 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3712 } 3713 if (!has_on_target_error) { 3714 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3715 } 3716 if (!has_granularity) { 3717 granularity = 0; 3718 } 3719 if (!has_buf_size) { 3720 buf_size = 0; 3721 } 3722 if (!has_unmap) { 3723 unmap = true; 3724 } 3725 if (!has_filter_node_name) { 3726 filter_node_name = NULL; 3727 } 3728 if (!has_copy_mode) { 3729 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3730 } 3731 if (has_auto_finalize && !auto_finalize) { 3732 job_flags |= JOB_MANUAL_FINALIZE; 3733 } 3734 if (has_auto_dismiss && !auto_dismiss) { 3735 job_flags |= JOB_MANUAL_DISMISS; 3736 } 3737 3738 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3739 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3740 "a value in range [512B, 64MB]"); 3741 return; 3742 } 3743 if (granularity & (granularity - 1)) { 3744 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3745 "power of 2"); 3746 return; 3747 } 3748 3749 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3750 return; 3751 } 3752 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3753 return; 3754 } 3755 3756 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3757 sync = MIRROR_SYNC_MODE_FULL; 3758 } 3759 3760 if (has_replaces) { 3761 BlockDriverState *to_replace_bs; 3762 AioContext *replace_aio_context; 3763 int64_t bs_size, replace_size; 3764 3765 bs_size = bdrv_getlength(bs); 3766 if (bs_size < 0) { 3767 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3768 return; 3769 } 3770 3771 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3772 if (!to_replace_bs) { 3773 return; 3774 } 3775 3776 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3777 aio_context_acquire(replace_aio_context); 3778 replace_size = bdrv_getlength(to_replace_bs); 3779 aio_context_release(replace_aio_context); 3780 3781 if (replace_size < 0) { 3782 error_setg_errno(errp, -replace_size, 3783 "Failed to query the replacement node's size"); 3784 return; 3785 } 3786 if (bs_size != replace_size) { 3787 error_setg(errp, "cannot replace image with a mirror image of " 3788 "different size"); 3789 return; 3790 } 3791 } 3792 3793 /* pass the node name to replace to mirror start since it's loose coupling 3794 * and will allow to check whether the node still exist at mirror completion 3795 */ 3796 mirror_start(job_id, bs, target, 3797 has_replaces ? replaces : NULL, job_flags, 3798 speed, granularity, buf_size, sync, backing_mode, 3799 on_source_error, on_target_error, unmap, filter_node_name, 3800 copy_mode, errp); 3801 } 3802 3803 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3804 { 3805 BlockDriverState *bs; 3806 BlockDriverState *source, *target_bs; 3807 AioContext *aio_context; 3808 BlockMirrorBackingMode backing_mode; 3809 Error *local_err = NULL; 3810 QDict *options = NULL; 3811 int flags; 3812 int64_t size; 3813 const char *format = arg->format; 3814 3815 bs = qmp_get_root_bs(arg->device, errp); 3816 if (!bs) { 3817 return; 3818 } 3819 3820 /* Early check to avoid creating target */ 3821 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3822 return; 3823 } 3824 3825 aio_context = bdrv_get_aio_context(bs); 3826 aio_context_acquire(aio_context); 3827 3828 if (!arg->has_mode) { 3829 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3830 } 3831 3832 if (!arg->has_format) { 3833 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3834 ? NULL : bs->drv->format_name); 3835 } 3836 3837 flags = bs->open_flags | BDRV_O_RDWR; 3838 source = backing_bs(bs); 3839 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3840 arg->sync = MIRROR_SYNC_MODE_FULL; 3841 } 3842 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3843 source = bs; 3844 } 3845 3846 size = bdrv_getlength(bs); 3847 if (size < 0) { 3848 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3849 goto out; 3850 } 3851 3852 if (arg->has_replaces) { 3853 if (!arg->has_node_name) { 3854 error_setg(errp, "a node-name must be provided when replacing a" 3855 " named node of the graph"); 3856 goto out; 3857 } 3858 } 3859 3860 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3861 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3862 } else { 3863 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3864 } 3865 3866 /* Don't open backing image in create() */ 3867 flags |= BDRV_O_NO_BACKING; 3868 3869 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3870 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3871 { 3872 /* create new image w/o backing file */ 3873 assert(format); 3874 bdrv_img_create(arg->target, format, 3875 NULL, NULL, NULL, size, flags, false, &local_err); 3876 } else { 3877 switch (arg->mode) { 3878 case NEW_IMAGE_MODE_EXISTING: 3879 break; 3880 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3881 /* create new image with backing file */ 3882 bdrv_refresh_filename(source); 3883 bdrv_img_create(arg->target, format, 3884 source->filename, 3885 source->drv->format_name, 3886 NULL, size, flags, false, &local_err); 3887 break; 3888 default: 3889 abort(); 3890 } 3891 } 3892 3893 if (local_err) { 3894 error_propagate(errp, local_err); 3895 goto out; 3896 } 3897 3898 options = qdict_new(); 3899 if (arg->has_node_name) { 3900 qdict_put_str(options, "node-name", arg->node_name); 3901 } 3902 if (format) { 3903 qdict_put_str(options, "driver", format); 3904 } 3905 3906 /* Mirroring takes care of copy-on-write using the source's backing 3907 * file. 3908 */ 3909 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3910 if (!target_bs) { 3911 goto out; 3912 } 3913 3914 bdrv_set_aio_context(target_bs, aio_context); 3915 3916 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3917 arg->has_replaces, arg->replaces, arg->sync, 3918 backing_mode, arg->has_speed, arg->speed, 3919 arg->has_granularity, arg->granularity, 3920 arg->has_buf_size, arg->buf_size, 3921 arg->has_on_source_error, arg->on_source_error, 3922 arg->has_on_target_error, arg->on_target_error, 3923 arg->has_unmap, arg->unmap, 3924 false, NULL, 3925 arg->has_copy_mode, arg->copy_mode, 3926 arg->has_auto_finalize, arg->auto_finalize, 3927 arg->has_auto_dismiss, arg->auto_dismiss, 3928 &local_err); 3929 bdrv_unref(target_bs); 3930 error_propagate(errp, local_err); 3931 out: 3932 aio_context_release(aio_context); 3933 } 3934 3935 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3936 const char *device, const char *target, 3937 bool has_replaces, const char *replaces, 3938 MirrorSyncMode sync, 3939 bool has_speed, int64_t speed, 3940 bool has_granularity, uint32_t granularity, 3941 bool has_buf_size, int64_t buf_size, 3942 bool has_on_source_error, 3943 BlockdevOnError on_source_error, 3944 bool has_on_target_error, 3945 BlockdevOnError on_target_error, 3946 bool has_filter_node_name, 3947 const char *filter_node_name, 3948 bool has_copy_mode, MirrorCopyMode copy_mode, 3949 bool has_auto_finalize, bool auto_finalize, 3950 bool has_auto_dismiss, bool auto_dismiss, 3951 Error **errp) 3952 { 3953 BlockDriverState *bs; 3954 BlockDriverState *target_bs; 3955 AioContext *aio_context; 3956 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3957 Error *local_err = NULL; 3958 3959 bs = qmp_get_root_bs(device, errp); 3960 if (!bs) { 3961 return; 3962 } 3963 3964 target_bs = bdrv_lookup_bs(target, target, errp); 3965 if (!target_bs) { 3966 return; 3967 } 3968 3969 aio_context = bdrv_get_aio_context(bs); 3970 aio_context_acquire(aio_context); 3971 3972 bdrv_set_aio_context(target_bs, aio_context); 3973 3974 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3975 has_replaces, replaces, sync, backing_mode, 3976 has_speed, speed, 3977 has_granularity, granularity, 3978 has_buf_size, buf_size, 3979 has_on_source_error, on_source_error, 3980 has_on_target_error, on_target_error, 3981 true, true, 3982 has_filter_node_name, filter_node_name, 3983 has_copy_mode, copy_mode, 3984 has_auto_finalize, auto_finalize, 3985 has_auto_dismiss, auto_dismiss, 3986 &local_err); 3987 error_propagate(errp, local_err); 3988 3989 aio_context_release(aio_context); 3990 } 3991 3992 /* Get a block job using its ID and acquire its AioContext */ 3993 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3994 Error **errp) 3995 { 3996 BlockJob *job; 3997 3998 assert(id != NULL); 3999 4000 *aio_context = NULL; 4001 4002 job = block_job_get(id); 4003 4004 if (!job) { 4005 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4006 "Block job '%s' not found", id); 4007 return NULL; 4008 } 4009 4010 *aio_context = blk_get_aio_context(job->blk); 4011 aio_context_acquire(*aio_context); 4012 4013 return job; 4014 } 4015 4016 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4017 { 4018 AioContext *aio_context; 4019 BlockJob *job = find_block_job(device, &aio_context, errp); 4020 4021 if (!job) { 4022 return; 4023 } 4024 4025 block_job_set_speed(job, speed, errp); 4026 aio_context_release(aio_context); 4027 } 4028 4029 void qmp_block_job_cancel(const char *device, 4030 bool has_force, bool force, Error **errp) 4031 { 4032 AioContext *aio_context; 4033 BlockJob *job = find_block_job(device, &aio_context, errp); 4034 4035 if (!job) { 4036 return; 4037 } 4038 4039 if (!has_force) { 4040 force = false; 4041 } 4042 4043 if (job_user_paused(&job->job) && !force) { 4044 error_setg(errp, "The block job for device '%s' is currently paused", 4045 device); 4046 goto out; 4047 } 4048 4049 trace_qmp_block_job_cancel(job); 4050 job_user_cancel(&job->job, force, errp); 4051 out: 4052 aio_context_release(aio_context); 4053 } 4054 4055 void qmp_block_job_pause(const char *device, Error **errp) 4056 { 4057 AioContext *aio_context; 4058 BlockJob *job = find_block_job(device, &aio_context, errp); 4059 4060 if (!job) { 4061 return; 4062 } 4063 4064 trace_qmp_block_job_pause(job); 4065 job_user_pause(&job->job, errp); 4066 aio_context_release(aio_context); 4067 } 4068 4069 void qmp_block_job_resume(const char *device, Error **errp) 4070 { 4071 AioContext *aio_context; 4072 BlockJob *job = find_block_job(device, &aio_context, errp); 4073 4074 if (!job) { 4075 return; 4076 } 4077 4078 trace_qmp_block_job_resume(job); 4079 job_user_resume(&job->job, errp); 4080 aio_context_release(aio_context); 4081 } 4082 4083 void qmp_block_job_complete(const char *device, Error **errp) 4084 { 4085 AioContext *aio_context; 4086 BlockJob *job = find_block_job(device, &aio_context, errp); 4087 4088 if (!job) { 4089 return; 4090 } 4091 4092 trace_qmp_block_job_complete(job); 4093 job_complete(&job->job, errp); 4094 aio_context_release(aio_context); 4095 } 4096 4097 void qmp_block_job_finalize(const char *id, Error **errp) 4098 { 4099 AioContext *aio_context; 4100 BlockJob *job = find_block_job(id, &aio_context, errp); 4101 4102 if (!job) { 4103 return; 4104 } 4105 4106 trace_qmp_block_job_finalize(job); 4107 job_finalize(&job->job, errp); 4108 aio_context_release(aio_context); 4109 } 4110 4111 void qmp_block_job_dismiss(const char *id, Error **errp) 4112 { 4113 AioContext *aio_context; 4114 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4115 Job *job; 4116 4117 if (!bjob) { 4118 return; 4119 } 4120 4121 trace_qmp_block_job_dismiss(bjob); 4122 job = &bjob->job; 4123 job_dismiss(&job, errp); 4124 aio_context_release(aio_context); 4125 } 4126 4127 void qmp_change_backing_file(const char *device, 4128 const char *image_node_name, 4129 const char *backing_file, 4130 Error **errp) 4131 { 4132 BlockDriverState *bs = NULL; 4133 AioContext *aio_context; 4134 BlockDriverState *image_bs = NULL; 4135 Error *local_err = NULL; 4136 bool ro; 4137 int ret; 4138 4139 bs = qmp_get_root_bs(device, errp); 4140 if (!bs) { 4141 return; 4142 } 4143 4144 aio_context = bdrv_get_aio_context(bs); 4145 aio_context_acquire(aio_context); 4146 4147 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4148 if (local_err) { 4149 error_propagate(errp, local_err); 4150 goto out; 4151 } 4152 4153 if (!image_bs) { 4154 error_setg(errp, "image file not found"); 4155 goto out; 4156 } 4157 4158 if (bdrv_find_base(image_bs) == image_bs) { 4159 error_setg(errp, "not allowing backing file change on an image " 4160 "without a backing file"); 4161 goto out; 4162 } 4163 4164 /* even though we are not necessarily operating on bs, we need it to 4165 * determine if block ops are currently prohibited on the chain */ 4166 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4167 goto out; 4168 } 4169 4170 /* final sanity check */ 4171 if (!bdrv_chain_contains(bs, image_bs)) { 4172 error_setg(errp, "'%s' and image file are not in the same chain", 4173 device); 4174 goto out; 4175 } 4176 4177 /* if not r/w, reopen to make r/w */ 4178 ro = bdrv_is_read_only(image_bs); 4179 4180 if (ro) { 4181 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4182 goto out; 4183 } 4184 } 4185 4186 ret = bdrv_change_backing_file(image_bs, backing_file, 4187 image_bs->drv ? image_bs->drv->format_name : ""); 4188 4189 if (ret < 0) { 4190 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4191 backing_file); 4192 /* don't exit here, so we can try to restore open flags if 4193 * appropriate */ 4194 } 4195 4196 if (ro) { 4197 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4198 error_propagate(errp, local_err); 4199 } 4200 4201 out: 4202 aio_context_release(aio_context); 4203 } 4204 4205 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4206 { 4207 QemuOpts *opts; 4208 QDict *qdict; 4209 Error *local_err = NULL; 4210 4211 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4212 if (!opts) { 4213 return; 4214 } 4215 4216 qdict = qemu_opts_to_qdict(opts, NULL); 4217 4218 if (!qdict_get_try_str(qdict, "node-name")) { 4219 qobject_unref(qdict); 4220 error_report("'node-name' needs to be specified"); 4221 goto out; 4222 } 4223 4224 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4225 if (!bs) { 4226 error_report_err(local_err); 4227 goto out; 4228 } 4229 4230 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4231 4232 out: 4233 qemu_opts_del(opts); 4234 } 4235 4236 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4237 { 4238 BlockDriverState *bs; 4239 QObject *obj; 4240 Visitor *v = qobject_output_visitor_new(&obj); 4241 QDict *qdict; 4242 Error *local_err = NULL; 4243 4244 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4245 if (local_err) { 4246 error_propagate(errp, local_err); 4247 goto fail; 4248 } 4249 4250 visit_complete(v, &obj); 4251 qdict = qobject_to(QDict, obj); 4252 4253 qdict_flatten(qdict); 4254 4255 if (!qdict_get_try_str(qdict, "node-name")) { 4256 error_setg(errp, "'node-name' must be specified for the root node"); 4257 goto fail; 4258 } 4259 4260 bs = bds_tree_init(qdict, errp); 4261 if (!bs) { 4262 goto fail; 4263 } 4264 4265 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4266 4267 fail: 4268 visit_free(v); 4269 } 4270 4271 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4272 { 4273 BlockDriverState *bs; 4274 AioContext *ctx; 4275 QObject *obj; 4276 Visitor *v = qobject_output_visitor_new(&obj); 4277 Error *local_err = NULL; 4278 BlockReopenQueue *queue; 4279 QDict *qdict; 4280 4281 /* Check for the selected node name */ 4282 if (!options->has_node_name) { 4283 error_setg(errp, "Node name not specified"); 4284 goto fail; 4285 } 4286 4287 bs = bdrv_find_node(options->node_name); 4288 if (!bs) { 4289 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4290 goto fail; 4291 } 4292 4293 /* Put all options in a QDict and flatten it */ 4294 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4295 if (local_err) { 4296 error_propagate(errp, local_err); 4297 goto fail; 4298 } 4299 4300 visit_complete(v, &obj); 4301 qdict = qobject_to(QDict, obj); 4302 4303 qdict_flatten(qdict); 4304 4305 /* Perform the reopen operation */ 4306 ctx = bdrv_get_aio_context(bs); 4307 aio_context_acquire(ctx); 4308 bdrv_subtree_drained_begin(bs); 4309 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4310 bdrv_reopen_multiple(queue, errp); 4311 bdrv_subtree_drained_end(bs); 4312 aio_context_release(ctx); 4313 4314 fail: 4315 visit_free(v); 4316 } 4317 4318 void qmp_blockdev_del(const char *node_name, Error **errp) 4319 { 4320 AioContext *aio_context; 4321 BlockDriverState *bs; 4322 4323 bs = bdrv_find_node(node_name); 4324 if (!bs) { 4325 error_setg(errp, "Cannot find node %s", node_name); 4326 return; 4327 } 4328 if (bdrv_has_blk(bs)) { 4329 error_setg(errp, "Node %s is in use", node_name); 4330 return; 4331 } 4332 aio_context = bdrv_get_aio_context(bs); 4333 aio_context_acquire(aio_context); 4334 4335 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4336 goto out; 4337 } 4338 4339 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4340 error_setg(errp, "Node %s is not owned by the monitor", 4341 bs->node_name); 4342 goto out; 4343 } 4344 4345 if (bs->refcnt > 1) { 4346 error_setg(errp, "Block device %s is in use", 4347 bdrv_get_device_or_node_name(bs)); 4348 goto out; 4349 } 4350 4351 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4352 bdrv_unref(bs); 4353 4354 out: 4355 aio_context_release(aio_context); 4356 } 4357 4358 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4359 const char *child_name) 4360 { 4361 BdrvChild *child; 4362 4363 QLIST_FOREACH(child, &parent_bs->children, next) { 4364 if (strcmp(child->name, child_name) == 0) { 4365 return child; 4366 } 4367 } 4368 4369 return NULL; 4370 } 4371 4372 void qmp_x_blockdev_change(const char *parent, bool has_child, 4373 const char *child, bool has_node, 4374 const char *node, Error **errp) 4375 { 4376 BlockDriverState *parent_bs, *new_bs = NULL; 4377 BdrvChild *p_child; 4378 4379 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4380 if (!parent_bs) { 4381 return; 4382 } 4383 4384 if (has_child == has_node) { 4385 if (has_child) { 4386 error_setg(errp, "The parameters child and node are in conflict"); 4387 } else { 4388 error_setg(errp, "Either child or node must be specified"); 4389 } 4390 return; 4391 } 4392 4393 if (has_child) { 4394 p_child = bdrv_find_child(parent_bs, child); 4395 if (!p_child) { 4396 error_setg(errp, "Node '%s' does not have child '%s'", 4397 parent, child); 4398 return; 4399 } 4400 bdrv_del_child(parent_bs, p_child, errp); 4401 } 4402 4403 if (has_node) { 4404 new_bs = bdrv_find_node(node); 4405 if (!new_bs) { 4406 error_setg(errp, "Node '%s' not found", node); 4407 return; 4408 } 4409 bdrv_add_child(parent_bs, new_bs, errp); 4410 } 4411 } 4412 4413 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4414 { 4415 BlockJobInfoList *head = NULL, **p_next = &head; 4416 BlockJob *job; 4417 4418 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4419 BlockJobInfoList *elem; 4420 AioContext *aio_context; 4421 4422 if (block_job_is_internal(job)) { 4423 continue; 4424 } 4425 elem = g_new0(BlockJobInfoList, 1); 4426 aio_context = blk_get_aio_context(job->blk); 4427 aio_context_acquire(aio_context); 4428 elem->value = block_job_query(job, errp); 4429 aio_context_release(aio_context); 4430 if (!elem->value) { 4431 g_free(elem); 4432 qapi_free_BlockJobInfoList(head); 4433 return NULL; 4434 } 4435 *p_next = elem; 4436 p_next = &elem->next; 4437 } 4438 4439 return head; 4440 } 4441 4442 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4443 bool has_force, bool force, Error **errp) 4444 { 4445 AioContext *old_context; 4446 AioContext *new_context; 4447 BlockDriverState *bs; 4448 4449 bs = bdrv_find_node(node_name); 4450 if (!bs) { 4451 error_setg(errp, "Cannot find node %s", node_name); 4452 return; 4453 } 4454 4455 /* Protects against accidents. */ 4456 if (!(has_force && force) && bdrv_has_blk(bs)) { 4457 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4458 "be in use (use force=true to override this check)", 4459 node_name); 4460 return; 4461 } 4462 4463 if (iothread->type == QTYPE_QSTRING) { 4464 IOThread *obj = iothread_by_id(iothread->u.s); 4465 if (!obj) { 4466 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4467 return; 4468 } 4469 4470 new_context = iothread_get_aio_context(obj); 4471 } else { 4472 new_context = qemu_get_aio_context(); 4473 } 4474 4475 old_context = bdrv_get_aio_context(bs); 4476 aio_context_acquire(old_context); 4477 4478 bdrv_set_aio_context(bs, new_context); 4479 4480 aio_context_release(old_context); 4481 } 4482 4483 void qmp_block_latency_histogram_set( 4484 const char *id, 4485 bool has_boundaries, uint64List *boundaries, 4486 bool has_boundaries_read, uint64List *boundaries_read, 4487 bool has_boundaries_write, uint64List *boundaries_write, 4488 bool has_boundaries_flush, uint64List *boundaries_flush, 4489 Error **errp) 4490 { 4491 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4492 BlockAcctStats *stats; 4493 int ret; 4494 4495 if (!blk) { 4496 return; 4497 } 4498 4499 stats = blk_get_stats(blk); 4500 4501 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4502 !has_boundaries_flush) 4503 { 4504 block_latency_histograms_clear(stats); 4505 return; 4506 } 4507 4508 if (has_boundaries || has_boundaries_read) { 4509 ret = block_latency_histogram_set( 4510 stats, BLOCK_ACCT_READ, 4511 has_boundaries_read ? boundaries_read : boundaries); 4512 if (ret) { 4513 error_setg(errp, "Device '%s' set read boundaries fail", id); 4514 return; 4515 } 4516 } 4517 4518 if (has_boundaries || has_boundaries_write) { 4519 ret = block_latency_histogram_set( 4520 stats, BLOCK_ACCT_WRITE, 4521 has_boundaries_write ? boundaries_write : boundaries); 4522 if (ret) { 4523 error_setg(errp, "Device '%s' set write boundaries fail", id); 4524 return; 4525 } 4526 } 4527 4528 if (has_boundaries || has_boundaries_flush) { 4529 ret = block_latency_histogram_set( 4530 stats, BLOCK_ACCT_FLUSH, 4531 has_boundaries_flush ? boundaries_flush : boundaries); 4532 if (ret) { 4533 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4534 return; 4535 } 4536 } 4537 } 4538 4539 QemuOptsList qemu_common_drive_opts = { 4540 .name = "drive", 4541 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4542 .desc = { 4543 { 4544 .name = "snapshot", 4545 .type = QEMU_OPT_BOOL, 4546 .help = "enable/disable snapshot mode", 4547 },{ 4548 .name = "aio", 4549 .type = QEMU_OPT_STRING, 4550 .help = "host AIO implementation (threads, native)", 4551 },{ 4552 .name = BDRV_OPT_CACHE_WB, 4553 .type = QEMU_OPT_BOOL, 4554 .help = "Enable writeback mode", 4555 },{ 4556 .name = "format", 4557 .type = QEMU_OPT_STRING, 4558 .help = "disk format (raw, qcow2, ...)", 4559 },{ 4560 .name = "rerror", 4561 .type = QEMU_OPT_STRING, 4562 .help = "read error action", 4563 },{ 4564 .name = "werror", 4565 .type = QEMU_OPT_STRING, 4566 .help = "write error action", 4567 },{ 4568 .name = BDRV_OPT_READ_ONLY, 4569 .type = QEMU_OPT_BOOL, 4570 .help = "open drive file as read-only", 4571 }, 4572 4573 THROTTLE_OPTS, 4574 4575 { 4576 .name = "throttling.group", 4577 .type = QEMU_OPT_STRING, 4578 .help = "name of the block throttling group", 4579 },{ 4580 .name = "copy-on-read", 4581 .type = QEMU_OPT_BOOL, 4582 .help = "copy read data from backing file into image file", 4583 },{ 4584 .name = "detect-zeroes", 4585 .type = QEMU_OPT_STRING, 4586 .help = "try to optimize zero writes (off, on, unmap)", 4587 },{ 4588 .name = "stats-account-invalid", 4589 .type = QEMU_OPT_BOOL, 4590 .help = "whether to account for invalid I/O operations " 4591 "in the statistics", 4592 },{ 4593 .name = "stats-account-failed", 4594 .type = QEMU_OPT_BOOL, 4595 .help = "whether to account for failed I/O operations " 4596 "in the statistics", 4597 }, 4598 { /* end of list */ } 4599 }, 4600 }; 4601 4602 QemuOptsList qemu_drive_opts = { 4603 .name = "drive", 4604 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4605 .desc = { 4606 /* 4607 * no elements => accept any params 4608 * validation will happen later 4609 */ 4610 { /* end of list */ } 4611 }, 4612 }; 4613