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(qemu_get_aio_context(), 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 int ret; 1539 1540 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1541 * purpose but a different set of parameters */ 1542 switch (action->type) { 1543 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1544 { 1545 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1546 device = s->node; 1547 node_name = s->node; 1548 new_image_file = NULL; 1549 snapshot_ref = s->overlay; 1550 } 1551 break; 1552 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1553 { 1554 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1555 device = s->has_device ? s->device : NULL; 1556 node_name = s->has_node_name ? s->node_name : NULL; 1557 new_image_file = s->snapshot_file; 1558 snapshot_ref = NULL; 1559 } 1560 break; 1561 default: 1562 g_assert_not_reached(); 1563 } 1564 1565 /* start processing */ 1566 if (action_check_completion_mode(common, errp) < 0) { 1567 return; 1568 } 1569 1570 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1571 if (!state->old_bs) { 1572 return; 1573 } 1574 1575 aio_context = bdrv_get_aio_context(state->old_bs); 1576 aio_context_acquire(aio_context); 1577 1578 /* Paired with .clean() */ 1579 bdrv_drained_begin(state->old_bs); 1580 1581 if (!bdrv_is_inserted(state->old_bs)) { 1582 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1583 goto out; 1584 } 1585 1586 if (bdrv_op_is_blocked(state->old_bs, 1587 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1588 goto out; 1589 } 1590 1591 if (!bdrv_is_read_only(state->old_bs)) { 1592 if (bdrv_flush(state->old_bs)) { 1593 error_setg(errp, QERR_IO_ERROR); 1594 goto out; 1595 } 1596 } 1597 1598 if (!bdrv_is_first_non_filter(state->old_bs)) { 1599 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1600 goto out; 1601 } 1602 1603 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1604 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1605 const char *format = s->has_format ? s->format : "qcow2"; 1606 enum NewImageMode mode; 1607 const char *snapshot_node_name = 1608 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1609 1610 if (node_name && !snapshot_node_name) { 1611 error_setg(errp, "New snapshot node name missing"); 1612 goto out; 1613 } 1614 1615 if (snapshot_node_name && 1616 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1617 error_setg(errp, "New snapshot node name already in use"); 1618 goto out; 1619 } 1620 1621 flags = state->old_bs->open_flags; 1622 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1623 flags |= BDRV_O_NO_BACKING; 1624 1625 /* create new image w/backing file */ 1626 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1627 if (mode != NEW_IMAGE_MODE_EXISTING) { 1628 int64_t size = bdrv_getlength(state->old_bs); 1629 if (size < 0) { 1630 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1631 goto out; 1632 } 1633 bdrv_refresh_filename(state->old_bs); 1634 bdrv_img_create(new_image_file, format, 1635 state->old_bs->filename, 1636 state->old_bs->drv->format_name, 1637 NULL, size, flags, false, &local_err); 1638 if (local_err) { 1639 error_propagate(errp, local_err); 1640 goto out; 1641 } 1642 } 1643 1644 options = qdict_new(); 1645 if (snapshot_node_name) { 1646 qdict_put_str(options, "node-name", snapshot_node_name); 1647 } 1648 qdict_put_str(options, "driver", format); 1649 } 1650 1651 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1652 errp); 1653 /* We will manually add the backing_hd field to the bs later */ 1654 if (!state->new_bs) { 1655 goto out; 1656 } 1657 1658 if (bdrv_has_blk(state->new_bs)) { 1659 error_setg(errp, "The snapshot is already in use"); 1660 goto out; 1661 } 1662 1663 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1664 errp)) { 1665 goto out; 1666 } 1667 1668 if (state->new_bs->backing != NULL) { 1669 error_setg(errp, "The snapshot already has a backing image"); 1670 goto out; 1671 } 1672 1673 if (!state->new_bs->drv->supports_backing) { 1674 error_setg(errp, "The snapshot does not support backing images"); 1675 goto out; 1676 } 1677 1678 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp); 1679 if (ret < 0) { 1680 goto out; 1681 } 1682 1683 /* This removes our old bs and adds the new bs. This is an operation that 1684 * can fail, so we need to do it in .prepare; undoing it for abort is 1685 * always possible. */ 1686 bdrv_ref(state->new_bs); 1687 bdrv_append(state->new_bs, state->old_bs, &local_err); 1688 if (local_err) { 1689 error_propagate(errp, local_err); 1690 goto out; 1691 } 1692 state->overlay_appended = true; 1693 1694 out: 1695 aio_context_release(aio_context); 1696 } 1697 1698 static void external_snapshot_commit(BlkActionState *common) 1699 { 1700 ExternalSnapshotState *state = 1701 DO_UPCAST(ExternalSnapshotState, common, common); 1702 AioContext *aio_context; 1703 1704 aio_context = bdrv_get_aio_context(state->old_bs); 1705 aio_context_acquire(aio_context); 1706 1707 /* We don't need (or want) to use the transactional 1708 * bdrv_reopen_multiple() across all the entries at once, because we 1709 * don't want to abort all of them if one of them fails the reopen */ 1710 if (!atomic_read(&state->old_bs->copy_on_read)) { 1711 bdrv_reopen_set_read_only(state->old_bs, true, NULL); 1712 } 1713 1714 aio_context_release(aio_context); 1715 } 1716 1717 static void external_snapshot_abort(BlkActionState *common) 1718 { 1719 ExternalSnapshotState *state = 1720 DO_UPCAST(ExternalSnapshotState, common, common); 1721 if (state->new_bs) { 1722 if (state->overlay_appended) { 1723 AioContext *aio_context; 1724 1725 aio_context = bdrv_get_aio_context(state->old_bs); 1726 aio_context_acquire(aio_context); 1727 1728 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1729 close state->old_bs; we need it */ 1730 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1731 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1732 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1733 1734 aio_context_release(aio_context); 1735 } 1736 } 1737 } 1738 1739 static void external_snapshot_clean(BlkActionState *common) 1740 { 1741 ExternalSnapshotState *state = 1742 DO_UPCAST(ExternalSnapshotState, common, common); 1743 AioContext *aio_context; 1744 1745 if (!state->old_bs) { 1746 return; 1747 } 1748 1749 aio_context = bdrv_get_aio_context(state->old_bs); 1750 aio_context_acquire(aio_context); 1751 1752 bdrv_drained_end(state->old_bs); 1753 bdrv_unref(state->new_bs); 1754 1755 aio_context_release(aio_context); 1756 } 1757 1758 typedef struct DriveBackupState { 1759 BlkActionState common; 1760 BlockDriverState *bs; 1761 BlockJob *job; 1762 } DriveBackupState; 1763 1764 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1765 Error **errp); 1766 1767 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1768 { 1769 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1770 BlockDriverState *bs; 1771 DriveBackup *backup; 1772 AioContext *aio_context; 1773 Error *local_err = NULL; 1774 1775 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1776 backup = common->action->u.drive_backup.data; 1777 1778 bs = qmp_get_root_bs(backup->device, errp); 1779 if (!bs) { 1780 return; 1781 } 1782 1783 aio_context = bdrv_get_aio_context(bs); 1784 aio_context_acquire(aio_context); 1785 1786 /* Paired with .clean() */ 1787 bdrv_drained_begin(bs); 1788 1789 state->bs = bs; 1790 1791 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1792 if (local_err) { 1793 error_propagate(errp, local_err); 1794 goto out; 1795 } 1796 1797 out: 1798 aio_context_release(aio_context); 1799 } 1800 1801 static void drive_backup_commit(BlkActionState *common) 1802 { 1803 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1804 AioContext *aio_context; 1805 1806 aio_context = bdrv_get_aio_context(state->bs); 1807 aio_context_acquire(aio_context); 1808 1809 assert(state->job); 1810 job_start(&state->job->job); 1811 1812 aio_context_release(aio_context); 1813 } 1814 1815 static void drive_backup_abort(BlkActionState *common) 1816 { 1817 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1818 1819 if (state->job) { 1820 AioContext *aio_context; 1821 1822 aio_context = bdrv_get_aio_context(state->bs); 1823 aio_context_acquire(aio_context); 1824 1825 job_cancel_sync(&state->job->job); 1826 1827 aio_context_release(aio_context); 1828 } 1829 } 1830 1831 static void drive_backup_clean(BlkActionState *common) 1832 { 1833 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1834 AioContext *aio_context; 1835 1836 if (!state->bs) { 1837 return; 1838 } 1839 1840 aio_context = bdrv_get_aio_context(state->bs); 1841 aio_context_acquire(aio_context); 1842 1843 bdrv_drained_end(state->bs); 1844 1845 aio_context_release(aio_context); 1846 } 1847 1848 typedef struct BlockdevBackupState { 1849 BlkActionState common; 1850 BlockDriverState *bs; 1851 BlockJob *job; 1852 } BlockdevBackupState; 1853 1854 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1855 Error **errp); 1856 1857 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1858 { 1859 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1860 BlockdevBackup *backup; 1861 BlockDriverState *bs, *target; 1862 AioContext *aio_context; 1863 Error *local_err = NULL; 1864 1865 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1866 backup = common->action->u.blockdev_backup.data; 1867 1868 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1869 if (!bs) { 1870 return; 1871 } 1872 1873 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1874 if (!target) { 1875 return; 1876 } 1877 1878 aio_context = bdrv_get_aio_context(bs); 1879 if (aio_context != bdrv_get_aio_context(target)) { 1880 error_setg(errp, "Backup between two IO threads is not implemented"); 1881 return; 1882 } 1883 aio_context_acquire(aio_context); 1884 state->bs = bs; 1885 1886 /* Paired with .clean() */ 1887 bdrv_drained_begin(state->bs); 1888 1889 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1890 if (local_err) { 1891 error_propagate(errp, local_err); 1892 goto out; 1893 } 1894 1895 out: 1896 aio_context_release(aio_context); 1897 } 1898 1899 static void blockdev_backup_commit(BlkActionState *common) 1900 { 1901 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1902 AioContext *aio_context; 1903 1904 aio_context = bdrv_get_aio_context(state->bs); 1905 aio_context_acquire(aio_context); 1906 1907 assert(state->job); 1908 job_start(&state->job->job); 1909 1910 aio_context_release(aio_context); 1911 } 1912 1913 static void blockdev_backup_abort(BlkActionState *common) 1914 { 1915 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1916 1917 if (state->job) { 1918 AioContext *aio_context; 1919 1920 aio_context = bdrv_get_aio_context(state->bs); 1921 aio_context_acquire(aio_context); 1922 1923 job_cancel_sync(&state->job->job); 1924 1925 aio_context_release(aio_context); 1926 } 1927 } 1928 1929 static void blockdev_backup_clean(BlkActionState *common) 1930 { 1931 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1932 AioContext *aio_context; 1933 1934 if (!state->bs) { 1935 return; 1936 } 1937 1938 aio_context = bdrv_get_aio_context(state->bs); 1939 aio_context_acquire(aio_context); 1940 1941 bdrv_drained_end(state->bs); 1942 1943 aio_context_release(aio_context); 1944 } 1945 1946 typedef struct BlockDirtyBitmapState { 1947 BlkActionState common; 1948 BdrvDirtyBitmap *bitmap; 1949 BlockDriverState *bs; 1950 HBitmap *backup; 1951 bool prepared; 1952 bool was_enabled; 1953 } BlockDirtyBitmapState; 1954 1955 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 1956 Error **errp) 1957 { 1958 Error *local_err = NULL; 1959 BlockDirtyBitmapAdd *action; 1960 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1961 common, common); 1962 1963 if (action_check_completion_mode(common, errp) < 0) { 1964 return; 1965 } 1966 1967 action = common->action->u.block_dirty_bitmap_add.data; 1968 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 1969 qmp_block_dirty_bitmap_add(action->node, action->name, 1970 action->has_granularity, action->granularity, 1971 action->has_persistent, action->persistent, 1972 action->has_autoload, action->autoload, 1973 action->has_disabled, action->disabled, 1974 &local_err); 1975 1976 if (!local_err) { 1977 state->prepared = true; 1978 } else { 1979 error_propagate(errp, local_err); 1980 } 1981 } 1982 1983 static void block_dirty_bitmap_add_abort(BlkActionState *common) 1984 { 1985 BlockDirtyBitmapAdd *action; 1986 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 1987 common, common); 1988 1989 action = common->action->u.block_dirty_bitmap_add.data; 1990 /* Should not be able to fail: IF the bitmap was added via .prepare(), 1991 * then the node reference and bitmap name must have been valid. 1992 */ 1993 if (state->prepared) { 1994 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 1995 } 1996 } 1997 1998 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 1999 Error **errp) 2000 { 2001 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2002 common, common); 2003 BlockDirtyBitmap *action; 2004 2005 if (action_check_completion_mode(common, errp) < 0) { 2006 return; 2007 } 2008 2009 action = common->action->u.block_dirty_bitmap_clear.data; 2010 state->bitmap = block_dirty_bitmap_lookup(action->node, 2011 action->name, 2012 &state->bs, 2013 errp); 2014 if (!state->bitmap) { 2015 return; 2016 } 2017 2018 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2019 return; 2020 } 2021 2022 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2023 } 2024 2025 static void block_dirty_bitmap_restore(BlkActionState *common) 2026 { 2027 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2028 common, common); 2029 2030 if (state->backup) { 2031 bdrv_restore_dirty_bitmap(state->bitmap, state->backup); 2032 } 2033 } 2034 2035 static void block_dirty_bitmap_free_backup(BlkActionState *common) 2036 { 2037 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2038 common, common); 2039 2040 hbitmap_free(state->backup); 2041 } 2042 2043 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2044 Error **errp) 2045 { 2046 BlockDirtyBitmap *action; 2047 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2048 common, common); 2049 2050 if (action_check_completion_mode(common, errp) < 0) { 2051 return; 2052 } 2053 2054 action = common->action->u.block_dirty_bitmap_enable.data; 2055 state->bitmap = block_dirty_bitmap_lookup(action->node, 2056 action->name, 2057 NULL, 2058 errp); 2059 if (!state->bitmap) { 2060 return; 2061 } 2062 2063 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2064 return; 2065 } 2066 2067 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2068 bdrv_enable_dirty_bitmap(state->bitmap); 2069 } 2070 2071 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2072 { 2073 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2074 common, common); 2075 2076 if (!state->was_enabled) { 2077 bdrv_disable_dirty_bitmap(state->bitmap); 2078 } 2079 } 2080 2081 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2082 Error **errp) 2083 { 2084 BlockDirtyBitmap *action; 2085 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2086 common, common); 2087 2088 if (action_check_completion_mode(common, errp) < 0) { 2089 return; 2090 } 2091 2092 action = common->action->u.block_dirty_bitmap_disable.data; 2093 state->bitmap = block_dirty_bitmap_lookup(action->node, 2094 action->name, 2095 NULL, 2096 errp); 2097 if (!state->bitmap) { 2098 return; 2099 } 2100 2101 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2102 return; 2103 } 2104 2105 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2106 bdrv_disable_dirty_bitmap(state->bitmap); 2107 } 2108 2109 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2110 { 2111 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2112 common, common); 2113 2114 if (state->was_enabled) { 2115 bdrv_enable_dirty_bitmap(state->bitmap); 2116 } 2117 } 2118 2119 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2120 const char *node, const char *target, 2121 BlockDirtyBitmapMergeSourceList *bitmaps, 2122 HBitmap **backup, Error **errp); 2123 2124 static void block_dirty_bitmap_merge_prepare(BlkActionState *common, 2125 Error **errp) 2126 { 2127 BlockDirtyBitmapMerge *action; 2128 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2129 common, common); 2130 2131 if (action_check_completion_mode(common, errp) < 0) { 2132 return; 2133 } 2134 2135 action = common->action->u.block_dirty_bitmap_merge.data; 2136 2137 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target, 2138 action->bitmaps, &state->backup, 2139 errp); 2140 } 2141 2142 static void abort_prepare(BlkActionState *common, Error **errp) 2143 { 2144 error_setg(errp, "Transaction aborted using Abort action"); 2145 } 2146 2147 static void abort_commit(BlkActionState *common) 2148 { 2149 g_assert_not_reached(); /* this action never succeeds */ 2150 } 2151 2152 static const BlkActionOps actions[] = { 2153 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2154 .instance_size = sizeof(ExternalSnapshotState), 2155 .prepare = external_snapshot_prepare, 2156 .commit = external_snapshot_commit, 2157 .abort = external_snapshot_abort, 2158 .clean = external_snapshot_clean, 2159 }, 2160 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2161 .instance_size = sizeof(ExternalSnapshotState), 2162 .prepare = external_snapshot_prepare, 2163 .commit = external_snapshot_commit, 2164 .abort = external_snapshot_abort, 2165 .clean = external_snapshot_clean, 2166 }, 2167 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2168 .instance_size = sizeof(DriveBackupState), 2169 .prepare = drive_backup_prepare, 2170 .commit = drive_backup_commit, 2171 .abort = drive_backup_abort, 2172 .clean = drive_backup_clean, 2173 }, 2174 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2175 .instance_size = sizeof(BlockdevBackupState), 2176 .prepare = blockdev_backup_prepare, 2177 .commit = blockdev_backup_commit, 2178 .abort = blockdev_backup_abort, 2179 .clean = blockdev_backup_clean, 2180 }, 2181 [TRANSACTION_ACTION_KIND_ABORT] = { 2182 .instance_size = sizeof(BlkActionState), 2183 .prepare = abort_prepare, 2184 .commit = abort_commit, 2185 }, 2186 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2187 .instance_size = sizeof(InternalSnapshotState), 2188 .prepare = internal_snapshot_prepare, 2189 .abort = internal_snapshot_abort, 2190 .clean = internal_snapshot_clean, 2191 }, 2192 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2193 .instance_size = sizeof(BlockDirtyBitmapState), 2194 .prepare = block_dirty_bitmap_add_prepare, 2195 .abort = block_dirty_bitmap_add_abort, 2196 }, 2197 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2198 .instance_size = sizeof(BlockDirtyBitmapState), 2199 .prepare = block_dirty_bitmap_clear_prepare, 2200 .commit = block_dirty_bitmap_free_backup, 2201 .abort = block_dirty_bitmap_restore, 2202 }, 2203 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { 2204 .instance_size = sizeof(BlockDirtyBitmapState), 2205 .prepare = block_dirty_bitmap_enable_prepare, 2206 .abort = block_dirty_bitmap_enable_abort, 2207 }, 2208 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { 2209 .instance_size = sizeof(BlockDirtyBitmapState), 2210 .prepare = block_dirty_bitmap_disable_prepare, 2211 .abort = block_dirty_bitmap_disable_abort, 2212 }, 2213 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { 2214 .instance_size = sizeof(BlockDirtyBitmapState), 2215 .prepare = block_dirty_bitmap_merge_prepare, 2216 .commit = block_dirty_bitmap_free_backup, 2217 .abort = block_dirty_bitmap_restore, 2218 }, 2219 /* Where are transactions for MIRROR, COMMIT and STREAM? 2220 * Although these blockjobs use transaction callbacks like the backup job, 2221 * these jobs do not necessarily adhere to transaction semantics. 2222 * These jobs may not fully undo all of their actions on abort, nor do they 2223 * necessarily work in transactions with more than one job in them. 2224 */ 2225 }; 2226 2227 /** 2228 * Allocate a TransactionProperties structure if necessary, and fill 2229 * that structure with desired defaults if they are unset. 2230 */ 2231 static TransactionProperties *get_transaction_properties( 2232 TransactionProperties *props) 2233 { 2234 if (!props) { 2235 props = g_new0(TransactionProperties, 1); 2236 } 2237 2238 if (!props->has_completion_mode) { 2239 props->has_completion_mode = true; 2240 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2241 } 2242 2243 return props; 2244 } 2245 2246 /* 2247 * 'Atomic' group operations. The operations are performed as a set, and if 2248 * any fail then we roll back all operations in the group. 2249 */ 2250 void qmp_transaction(TransactionActionList *dev_list, 2251 bool has_props, 2252 struct TransactionProperties *props, 2253 Error **errp) 2254 { 2255 TransactionActionList *dev_entry = dev_list; 2256 JobTxn *block_job_txn = NULL; 2257 BlkActionState *state, *next; 2258 Error *local_err = NULL; 2259 2260 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; 2261 QTAILQ_INIT(&snap_bdrv_states); 2262 2263 /* Does this transaction get canceled as a group on failure? 2264 * If not, we don't really need to make a JobTxn. 2265 */ 2266 props = get_transaction_properties(props); 2267 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2268 block_job_txn = job_txn_new(); 2269 } 2270 2271 /* drain all i/o before any operations */ 2272 bdrv_drain_all(); 2273 2274 /* We don't do anything in this loop that commits us to the operations */ 2275 while (NULL != dev_entry) { 2276 TransactionAction *dev_info = NULL; 2277 const BlkActionOps *ops; 2278 2279 dev_info = dev_entry->value; 2280 dev_entry = dev_entry->next; 2281 2282 assert(dev_info->type < ARRAY_SIZE(actions)); 2283 2284 ops = &actions[dev_info->type]; 2285 assert(ops->instance_size > 0); 2286 2287 state = g_malloc0(ops->instance_size); 2288 state->ops = ops; 2289 state->action = dev_info; 2290 state->block_job_txn = block_job_txn; 2291 state->txn_props = props; 2292 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2293 2294 state->ops->prepare(state, &local_err); 2295 if (local_err) { 2296 error_propagate(errp, local_err); 2297 goto delete_and_fail; 2298 } 2299 } 2300 2301 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { 2302 if (state->ops->commit) { 2303 state->ops->commit(state); 2304 } 2305 } 2306 2307 /* success */ 2308 goto exit; 2309 2310 delete_and_fail: 2311 /* failure, and it is all-or-none; roll back all operations */ 2312 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { 2313 if (state->ops->abort) { 2314 state->ops->abort(state); 2315 } 2316 } 2317 exit: 2318 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2319 if (state->ops->clean) { 2320 state->ops->clean(state); 2321 } 2322 g_free(state); 2323 } 2324 if (!has_props) { 2325 qapi_free_TransactionProperties(props); 2326 } 2327 job_txn_unref(block_job_txn); 2328 } 2329 2330 void qmp_eject(bool has_device, const char *device, 2331 bool has_id, const char *id, 2332 bool has_force, bool force, Error **errp) 2333 { 2334 Error *local_err = NULL; 2335 int rc; 2336 2337 if (!has_force) { 2338 force = false; 2339 } 2340 2341 rc = do_open_tray(has_device ? device : NULL, 2342 has_id ? id : NULL, 2343 force, &local_err); 2344 if (rc && rc != -ENOSYS) { 2345 error_propagate(errp, local_err); 2346 return; 2347 } 2348 error_free(local_err); 2349 2350 blockdev_remove_medium(has_device, device, has_id, id, errp); 2351 } 2352 2353 void qmp_block_passwd(bool has_device, const char *device, 2354 bool has_node_name, const char *node_name, 2355 const char *password, Error **errp) 2356 { 2357 error_setg(errp, 2358 "Setting block passwords directly is no longer supported"); 2359 } 2360 2361 /* 2362 * Attempt to open the tray of @device. 2363 * If @force, ignore its tray lock. 2364 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2365 * On error, store an error through @errp and return -errno. 2366 * If @device does not exist, return -ENODEV. 2367 * If it has no removable media, return -ENOTSUP. 2368 * If it has no tray, return -ENOSYS. 2369 * If the guest was asked to open the tray, return -EINPROGRESS. 2370 * Else, return 0. 2371 */ 2372 static int do_open_tray(const char *blk_name, const char *qdev_id, 2373 bool force, Error **errp) 2374 { 2375 BlockBackend *blk; 2376 const char *device = qdev_id ?: blk_name; 2377 bool locked; 2378 2379 blk = qmp_get_blk(blk_name, qdev_id, errp); 2380 if (!blk) { 2381 return -ENODEV; 2382 } 2383 2384 if (!blk_dev_has_removable_media(blk)) { 2385 error_setg(errp, "Device '%s' is not removable", device); 2386 return -ENOTSUP; 2387 } 2388 2389 if (!blk_dev_has_tray(blk)) { 2390 error_setg(errp, "Device '%s' does not have a tray", device); 2391 return -ENOSYS; 2392 } 2393 2394 if (blk_dev_is_tray_open(blk)) { 2395 return 0; 2396 } 2397 2398 locked = blk_dev_is_medium_locked(blk); 2399 if (locked) { 2400 blk_dev_eject_request(blk, force); 2401 } 2402 2403 if (!locked || force) { 2404 blk_dev_change_media_cb(blk, false, &error_abort); 2405 } 2406 2407 if (locked && !force) { 2408 error_setg(errp, "Device '%s' is locked and force was not specified, " 2409 "wait for tray to open and try again", device); 2410 return -EINPROGRESS; 2411 } 2412 2413 return 0; 2414 } 2415 2416 void qmp_blockdev_open_tray(bool has_device, const char *device, 2417 bool has_id, const char *id, 2418 bool has_force, bool force, 2419 Error **errp) 2420 { 2421 Error *local_err = NULL; 2422 int rc; 2423 2424 if (!has_force) { 2425 force = false; 2426 } 2427 rc = do_open_tray(has_device ? device : NULL, 2428 has_id ? id : NULL, 2429 force, &local_err); 2430 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2431 error_propagate(errp, local_err); 2432 return; 2433 } 2434 error_free(local_err); 2435 } 2436 2437 void qmp_blockdev_close_tray(bool has_device, const char *device, 2438 bool has_id, const char *id, 2439 Error **errp) 2440 { 2441 BlockBackend *blk; 2442 Error *local_err = NULL; 2443 2444 device = has_device ? device : NULL; 2445 id = has_id ? id : NULL; 2446 2447 blk = qmp_get_blk(device, id, errp); 2448 if (!blk) { 2449 return; 2450 } 2451 2452 if (!blk_dev_has_removable_media(blk)) { 2453 error_setg(errp, "Device '%s' is not removable", device ?: id); 2454 return; 2455 } 2456 2457 if (!blk_dev_has_tray(blk)) { 2458 /* Ignore this command on tray-less devices */ 2459 return; 2460 } 2461 2462 if (!blk_dev_is_tray_open(blk)) { 2463 return; 2464 } 2465 2466 blk_dev_change_media_cb(blk, true, &local_err); 2467 if (local_err) { 2468 error_propagate(errp, local_err); 2469 return; 2470 } 2471 } 2472 2473 static void blockdev_remove_medium(bool has_device, const char *device, 2474 bool has_id, const char *id, Error **errp) 2475 { 2476 BlockBackend *blk; 2477 BlockDriverState *bs; 2478 AioContext *aio_context; 2479 bool has_attached_device; 2480 2481 device = has_device ? device : NULL; 2482 id = has_id ? id : NULL; 2483 2484 blk = qmp_get_blk(device, id, errp); 2485 if (!blk) { 2486 return; 2487 } 2488 2489 /* For BBs without a device, we can exchange the BDS tree at will */ 2490 has_attached_device = blk_get_attached_dev(blk); 2491 2492 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2493 error_setg(errp, "Device '%s' is not removable", device ?: id); 2494 return; 2495 } 2496 2497 if (has_attached_device && blk_dev_has_tray(blk) && 2498 !blk_dev_is_tray_open(blk)) 2499 { 2500 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2501 return; 2502 } 2503 2504 bs = blk_bs(blk); 2505 if (!bs) { 2506 return; 2507 } 2508 2509 aio_context = bdrv_get_aio_context(bs); 2510 aio_context_acquire(aio_context); 2511 2512 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2513 goto out; 2514 } 2515 2516 blk_remove_bs(blk); 2517 2518 if (!blk_dev_has_tray(blk)) { 2519 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2520 * called at all); therefore, the medium needs to be ejected here. 2521 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2522 * value passed here (i.e. false). */ 2523 blk_dev_change_media_cb(blk, false, &error_abort); 2524 } 2525 2526 out: 2527 aio_context_release(aio_context); 2528 } 2529 2530 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2531 { 2532 blockdev_remove_medium(false, NULL, true, id, errp); 2533 } 2534 2535 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2536 BlockDriverState *bs, Error **errp) 2537 { 2538 Error *local_err = NULL; 2539 bool has_device; 2540 int ret; 2541 2542 /* For BBs without a device, we can exchange the BDS tree at will */ 2543 has_device = blk_get_attached_dev(blk); 2544 2545 if (has_device && !blk_dev_has_removable_media(blk)) { 2546 error_setg(errp, "Device is not removable"); 2547 return; 2548 } 2549 2550 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2551 error_setg(errp, "Tray of the device is not open"); 2552 return; 2553 } 2554 2555 if (blk_bs(blk)) { 2556 error_setg(errp, "There already is a medium in the device"); 2557 return; 2558 } 2559 2560 ret = blk_insert_bs(blk, bs, errp); 2561 if (ret < 0) { 2562 return; 2563 } 2564 2565 if (!blk_dev_has_tray(blk)) { 2566 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2567 * called at all); therefore, the medium needs to be pushed into the 2568 * slot here. 2569 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2570 * value passed here (i.e. true). */ 2571 blk_dev_change_media_cb(blk, true, &local_err); 2572 if (local_err) { 2573 error_propagate(errp, local_err); 2574 blk_remove_bs(blk); 2575 return; 2576 } 2577 } 2578 } 2579 2580 static void blockdev_insert_medium(bool has_device, const char *device, 2581 bool has_id, const char *id, 2582 const char *node_name, Error **errp) 2583 { 2584 BlockBackend *blk; 2585 BlockDriverState *bs; 2586 2587 blk = qmp_get_blk(has_device ? device : NULL, 2588 has_id ? id : NULL, 2589 errp); 2590 if (!blk) { 2591 return; 2592 } 2593 2594 bs = bdrv_find_node(node_name); 2595 if (!bs) { 2596 error_setg(errp, "Node '%s' not found", node_name); 2597 return; 2598 } 2599 2600 if (bdrv_has_blk(bs)) { 2601 error_setg(errp, "Node '%s' is already in use", node_name); 2602 return; 2603 } 2604 2605 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2606 } 2607 2608 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2609 Error **errp) 2610 { 2611 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2612 } 2613 2614 void qmp_blockdev_change_medium(bool has_device, const char *device, 2615 bool has_id, const char *id, 2616 const char *filename, 2617 bool has_format, const char *format, 2618 bool has_read_only, 2619 BlockdevChangeReadOnlyMode read_only, 2620 Error **errp) 2621 { 2622 BlockBackend *blk; 2623 BlockDriverState *medium_bs = NULL; 2624 int bdrv_flags; 2625 bool detect_zeroes; 2626 int rc; 2627 QDict *options = NULL; 2628 Error *err = NULL; 2629 2630 blk = qmp_get_blk(has_device ? device : NULL, 2631 has_id ? id : NULL, 2632 errp); 2633 if (!blk) { 2634 goto fail; 2635 } 2636 2637 if (blk_bs(blk)) { 2638 blk_update_root_state(blk); 2639 } 2640 2641 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2642 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2643 BDRV_O_PROTOCOL | BDRV_O_AUTO_RDONLY); 2644 2645 if (!has_read_only) { 2646 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2647 } 2648 2649 switch (read_only) { 2650 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2651 break; 2652 2653 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2654 bdrv_flags &= ~BDRV_O_RDWR; 2655 break; 2656 2657 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2658 bdrv_flags |= BDRV_O_RDWR; 2659 break; 2660 2661 default: 2662 abort(); 2663 } 2664 2665 options = qdict_new(); 2666 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2667 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2668 2669 if (has_format) { 2670 qdict_put_str(options, "driver", format); 2671 } 2672 2673 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2674 if (!medium_bs) { 2675 goto fail; 2676 } 2677 2678 rc = do_open_tray(has_device ? device : NULL, 2679 has_id ? id : NULL, 2680 false, &err); 2681 if (rc && rc != -ENOSYS) { 2682 error_propagate(errp, err); 2683 goto fail; 2684 } 2685 error_free(err); 2686 err = NULL; 2687 2688 blockdev_remove_medium(has_device, device, has_id, id, &err); 2689 if (err) { 2690 error_propagate(errp, err); 2691 goto fail; 2692 } 2693 2694 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2695 if (err) { 2696 error_propagate(errp, err); 2697 goto fail; 2698 } 2699 2700 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2701 2702 fail: 2703 /* If the medium has been inserted, the device has its own reference, so 2704 * ours must be relinquished; and if it has not been inserted successfully, 2705 * the reference must be relinquished anyway */ 2706 bdrv_unref(medium_bs); 2707 } 2708 2709 /* throttling disk I/O limits */ 2710 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2711 { 2712 ThrottleConfig cfg; 2713 BlockDriverState *bs; 2714 BlockBackend *blk; 2715 AioContext *aio_context; 2716 2717 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2718 arg->has_id ? arg->id : NULL, 2719 errp); 2720 if (!blk) { 2721 return; 2722 } 2723 2724 aio_context = blk_get_aio_context(blk); 2725 aio_context_acquire(aio_context); 2726 2727 bs = blk_bs(blk); 2728 if (!bs) { 2729 error_setg(errp, "Device has no medium"); 2730 goto out; 2731 } 2732 2733 throttle_config_init(&cfg); 2734 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2735 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2736 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2737 2738 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2739 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2740 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2741 2742 if (arg->has_bps_max) { 2743 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2744 } 2745 if (arg->has_bps_rd_max) { 2746 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2747 } 2748 if (arg->has_bps_wr_max) { 2749 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2750 } 2751 if (arg->has_iops_max) { 2752 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2753 } 2754 if (arg->has_iops_rd_max) { 2755 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2756 } 2757 if (arg->has_iops_wr_max) { 2758 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2759 } 2760 2761 if (arg->has_bps_max_length) { 2762 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2763 } 2764 if (arg->has_bps_rd_max_length) { 2765 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2766 } 2767 if (arg->has_bps_wr_max_length) { 2768 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2769 } 2770 if (arg->has_iops_max_length) { 2771 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2772 } 2773 if (arg->has_iops_rd_max_length) { 2774 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2775 } 2776 if (arg->has_iops_wr_max_length) { 2777 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2778 } 2779 2780 if (arg->has_iops_size) { 2781 cfg.op_size = arg->iops_size; 2782 } 2783 2784 if (!throttle_is_valid(&cfg, errp)) { 2785 goto out; 2786 } 2787 2788 if (throttle_enabled(&cfg)) { 2789 /* Enable I/O limits if they're not enabled yet, otherwise 2790 * just update the throttling group. */ 2791 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2792 blk_io_limits_enable(blk, 2793 arg->has_group ? arg->group : 2794 arg->has_device ? arg->device : 2795 arg->id); 2796 } else if (arg->has_group) { 2797 blk_io_limits_update_group(blk, arg->group); 2798 } 2799 /* Set the new throttling configuration */ 2800 blk_set_io_limits(blk, &cfg); 2801 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2802 /* If all throttling settings are set to 0, disable I/O limits */ 2803 blk_io_limits_disable(blk); 2804 } 2805 2806 out: 2807 aio_context_release(aio_context); 2808 } 2809 2810 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2811 bool has_granularity, uint32_t granularity, 2812 bool has_persistent, bool persistent, 2813 bool has_autoload, bool autoload, 2814 bool has_disabled, bool disabled, 2815 Error **errp) 2816 { 2817 BlockDriverState *bs; 2818 BdrvDirtyBitmap *bitmap; 2819 AioContext *aio_context = NULL; 2820 2821 if (!name || name[0] == '\0') { 2822 error_setg(errp, "Bitmap name cannot be empty"); 2823 return; 2824 } 2825 2826 bs = bdrv_lookup_bs(node, node, errp); 2827 if (!bs) { 2828 return; 2829 } 2830 2831 if (has_granularity) { 2832 if (granularity < 512 || !is_power_of_2(granularity)) { 2833 error_setg(errp, "Granularity must be power of 2 " 2834 "and at least 512"); 2835 return; 2836 } 2837 } else { 2838 /* Default to cluster size, if available: */ 2839 granularity = bdrv_get_default_bitmap_granularity(bs); 2840 } 2841 2842 if (!has_persistent) { 2843 persistent = false; 2844 } 2845 2846 if (has_autoload) { 2847 warn_report("Autoload option is deprecated and its value is ignored"); 2848 } 2849 2850 if (!has_disabled) { 2851 disabled = false; 2852 } 2853 2854 if (persistent) { 2855 aio_context = bdrv_get_aio_context(bs); 2856 aio_context_acquire(aio_context); 2857 if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { 2858 goto out; 2859 } 2860 } 2861 2862 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2863 if (bitmap == NULL) { 2864 goto out; 2865 } 2866 2867 if (disabled) { 2868 bdrv_disable_dirty_bitmap(bitmap); 2869 } 2870 2871 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); 2872 out: 2873 if (aio_context) { 2874 aio_context_release(aio_context); 2875 } 2876 } 2877 2878 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2879 Error **errp) 2880 { 2881 BlockDriverState *bs; 2882 BdrvDirtyBitmap *bitmap; 2883 Error *local_err = NULL; 2884 AioContext *aio_context = NULL; 2885 2886 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2887 if (!bitmap || !bs) { 2888 return; 2889 } 2890 2891 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO, 2892 errp)) { 2893 return; 2894 } 2895 2896 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { 2897 aio_context = bdrv_get_aio_context(bs); 2898 aio_context_acquire(aio_context); 2899 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2900 if (local_err != NULL) { 2901 error_propagate(errp, local_err); 2902 goto out; 2903 } 2904 } 2905 2906 bdrv_release_dirty_bitmap(bs, bitmap); 2907 out: 2908 if (aio_context) { 2909 aio_context_release(aio_context); 2910 } 2911 } 2912 2913 /** 2914 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2915 * immediately after a full backup operation. 2916 */ 2917 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2918 Error **errp) 2919 { 2920 BdrvDirtyBitmap *bitmap; 2921 BlockDriverState *bs; 2922 2923 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2924 if (!bitmap || !bs) { 2925 return; 2926 } 2927 2928 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) { 2929 return; 2930 } 2931 2932 bdrv_clear_dirty_bitmap(bitmap, NULL); 2933 } 2934 2935 void qmp_block_dirty_bitmap_enable(const char *node, const char *name, 2936 Error **errp) 2937 { 2938 BlockDriverState *bs; 2939 BdrvDirtyBitmap *bitmap; 2940 2941 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2942 if (!bitmap) { 2943 return; 2944 } 2945 2946 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2947 return; 2948 } 2949 2950 bdrv_enable_dirty_bitmap(bitmap); 2951 } 2952 2953 void qmp_block_dirty_bitmap_disable(const char *node, const char *name, 2954 Error **errp) 2955 { 2956 BlockDriverState *bs; 2957 BdrvDirtyBitmap *bitmap; 2958 2959 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2960 if (!bitmap) { 2961 return; 2962 } 2963 2964 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { 2965 return; 2966 } 2967 2968 bdrv_disable_dirty_bitmap(bitmap); 2969 } 2970 2971 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge( 2972 const char *node, const char *target, 2973 BlockDirtyBitmapMergeSourceList *bitmaps, 2974 HBitmap **backup, Error **errp) 2975 { 2976 BlockDriverState *bs; 2977 BdrvDirtyBitmap *dst, *src, *anon; 2978 BlockDirtyBitmapMergeSourceList *lst; 2979 Error *local_err = NULL; 2980 2981 dst = block_dirty_bitmap_lookup(node, target, &bs, errp); 2982 if (!dst) { 2983 return NULL; 2984 } 2985 2986 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), 2987 NULL, errp); 2988 if (!anon) { 2989 return NULL; 2990 } 2991 2992 for (lst = bitmaps; lst; lst = lst->next) { 2993 switch (lst->value->type) { 2994 const char *name, *node; 2995 case QTYPE_QSTRING: 2996 name = lst->value->u.local; 2997 src = bdrv_find_dirty_bitmap(bs, name); 2998 if (!src) { 2999 error_setg(errp, "Dirty bitmap '%s' not found", name); 3000 dst = NULL; 3001 goto out; 3002 } 3003 break; 3004 case QTYPE_QDICT: 3005 node = lst->value->u.external.node; 3006 name = lst->value->u.external.name; 3007 src = block_dirty_bitmap_lookup(node, name, NULL, errp); 3008 if (!src) { 3009 dst = NULL; 3010 goto out; 3011 } 3012 break; 3013 default: 3014 abort(); 3015 } 3016 3017 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); 3018 if (local_err) { 3019 error_propagate(errp, local_err); 3020 dst = NULL; 3021 goto out; 3022 } 3023 } 3024 3025 /* Merge into dst; dst is unchanged on failure. */ 3026 bdrv_merge_dirty_bitmap(dst, anon, backup, errp); 3027 3028 out: 3029 bdrv_release_dirty_bitmap(bs, anon); 3030 return dst; 3031 } 3032 3033 void qmp_block_dirty_bitmap_merge(const char *node, const char *target, 3034 BlockDirtyBitmapMergeSourceList *bitmaps, 3035 Error **errp) 3036 { 3037 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); 3038 } 3039 3040 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3041 const char *name, 3042 Error **errp) 3043 { 3044 BdrvDirtyBitmap *bitmap; 3045 BlockDriverState *bs; 3046 BlockDirtyBitmapSha256 *ret = NULL; 3047 char *sha256; 3048 3049 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3050 if (!bitmap || !bs) { 3051 return NULL; 3052 } 3053 3054 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3055 if (sha256 == NULL) { 3056 return NULL; 3057 } 3058 3059 ret = g_new(BlockDirtyBitmapSha256, 1); 3060 ret->sha256 = sha256; 3061 3062 return ret; 3063 } 3064 3065 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3066 { 3067 const char *id = qdict_get_str(qdict, "id"); 3068 BlockBackend *blk; 3069 BlockDriverState *bs; 3070 AioContext *aio_context; 3071 Error *local_err = NULL; 3072 3073 bs = bdrv_find_node(id); 3074 if (bs) { 3075 qmp_blockdev_del(id, &local_err); 3076 if (local_err) { 3077 error_report_err(local_err); 3078 } 3079 return; 3080 } 3081 3082 blk = blk_by_name(id); 3083 if (!blk) { 3084 error_report("Device '%s' not found", id); 3085 return; 3086 } 3087 3088 if (!blk_legacy_dinfo(blk)) { 3089 error_report("Deleting device added with blockdev-add" 3090 " is not supported"); 3091 return; 3092 } 3093 3094 aio_context = blk_get_aio_context(blk); 3095 aio_context_acquire(aio_context); 3096 3097 bs = blk_bs(blk); 3098 if (bs) { 3099 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3100 error_report_err(local_err); 3101 aio_context_release(aio_context); 3102 return; 3103 } 3104 3105 blk_remove_bs(blk); 3106 } 3107 3108 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3109 monitor_remove_blk(blk); 3110 3111 /* If this BlockBackend has a device attached to it, its refcount will be 3112 * decremented when the device is removed; otherwise we have to do so here. 3113 */ 3114 if (blk_get_attached_dev(blk)) { 3115 /* Further I/O must not pause the guest */ 3116 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3117 BLOCKDEV_ON_ERROR_REPORT); 3118 } else { 3119 blk_unref(blk); 3120 } 3121 3122 aio_context_release(aio_context); 3123 } 3124 3125 void qmp_block_resize(bool has_device, const char *device, 3126 bool has_node_name, const char *node_name, 3127 int64_t size, Error **errp) 3128 { 3129 Error *local_err = NULL; 3130 BlockBackend *blk = NULL; 3131 BlockDriverState *bs; 3132 AioContext *aio_context; 3133 int ret; 3134 3135 bs = bdrv_lookup_bs(has_device ? device : NULL, 3136 has_node_name ? node_name : NULL, 3137 &local_err); 3138 if (local_err) { 3139 error_propagate(errp, local_err); 3140 return; 3141 } 3142 3143 aio_context = bdrv_get_aio_context(bs); 3144 aio_context_acquire(aio_context); 3145 3146 if (!bdrv_is_first_non_filter(bs)) { 3147 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3148 goto out; 3149 } 3150 3151 if (size < 0) { 3152 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3153 goto out; 3154 } 3155 3156 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3157 error_setg(errp, QERR_DEVICE_IN_USE, device); 3158 goto out; 3159 } 3160 3161 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL); 3162 ret = blk_insert_bs(blk, bs, errp); 3163 if (ret < 0) { 3164 goto out; 3165 } 3166 3167 bdrv_drained_begin(bs); 3168 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3169 bdrv_drained_end(bs); 3170 3171 out: 3172 blk_unref(blk); 3173 aio_context_release(aio_context); 3174 } 3175 3176 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3177 bool has_base, const char *base, 3178 bool has_base_node, const char *base_node, 3179 bool has_backing_file, const char *backing_file, 3180 bool has_speed, int64_t speed, 3181 bool has_on_error, BlockdevOnError on_error, 3182 bool has_auto_finalize, bool auto_finalize, 3183 bool has_auto_dismiss, bool auto_dismiss, 3184 Error **errp) 3185 { 3186 BlockDriverState *bs, *iter; 3187 BlockDriverState *base_bs = NULL; 3188 AioContext *aio_context; 3189 Error *local_err = NULL; 3190 const char *base_name = NULL; 3191 int job_flags = JOB_DEFAULT; 3192 3193 if (!has_on_error) { 3194 on_error = BLOCKDEV_ON_ERROR_REPORT; 3195 } 3196 3197 bs = bdrv_lookup_bs(device, device, errp); 3198 if (!bs) { 3199 return; 3200 } 3201 3202 aio_context = bdrv_get_aio_context(bs); 3203 aio_context_acquire(aio_context); 3204 3205 if (has_base && has_base_node) { 3206 error_setg(errp, "'base' and 'base-node' cannot be specified " 3207 "at the same time"); 3208 goto out; 3209 } 3210 3211 if (has_base) { 3212 base_bs = bdrv_find_backing_image(bs, base); 3213 if (base_bs == NULL) { 3214 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3215 goto out; 3216 } 3217 assert(bdrv_get_aio_context(base_bs) == aio_context); 3218 base_name = base; 3219 } 3220 3221 if (has_base_node) { 3222 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3223 if (!base_bs) { 3224 goto out; 3225 } 3226 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3227 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3228 base_node, device); 3229 goto out; 3230 } 3231 assert(bdrv_get_aio_context(base_bs) == aio_context); 3232 bdrv_refresh_filename(base_bs); 3233 base_name = base_bs->filename; 3234 } 3235 3236 /* Check for op blockers in the whole chain between bs and base */ 3237 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3238 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3239 goto out; 3240 } 3241 } 3242 3243 /* if we are streaming the entire chain, the result will have no backing 3244 * file, and specifying one is therefore an error */ 3245 if (base_bs == NULL && has_backing_file) { 3246 error_setg(errp, "backing file specified, but streaming the " 3247 "entire chain"); 3248 goto out; 3249 } 3250 3251 /* backing_file string overrides base bs filename */ 3252 base_name = has_backing_file ? backing_file : base_name; 3253 3254 if (has_auto_finalize && !auto_finalize) { 3255 job_flags |= JOB_MANUAL_FINALIZE; 3256 } 3257 if (has_auto_dismiss && !auto_dismiss) { 3258 job_flags |= JOB_MANUAL_DISMISS; 3259 } 3260 3261 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3262 job_flags, has_speed ? speed : 0, on_error, &local_err); 3263 if (local_err) { 3264 error_propagate(errp, local_err); 3265 goto out; 3266 } 3267 3268 trace_qmp_block_stream(bs, bs->job); 3269 3270 out: 3271 aio_context_release(aio_context); 3272 } 3273 3274 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3275 bool has_base_node, const char *base_node, 3276 bool has_base, const char *base, 3277 bool has_top_node, const char *top_node, 3278 bool has_top, const char *top, 3279 bool has_backing_file, const char *backing_file, 3280 bool has_speed, int64_t speed, 3281 bool has_filter_node_name, const char *filter_node_name, 3282 bool has_auto_finalize, bool auto_finalize, 3283 bool has_auto_dismiss, bool auto_dismiss, 3284 Error **errp) 3285 { 3286 BlockDriverState *bs; 3287 BlockDriverState *iter; 3288 BlockDriverState *base_bs, *top_bs; 3289 AioContext *aio_context; 3290 Error *local_err = NULL; 3291 /* This will be part of the QMP command, if/when the 3292 * BlockdevOnError change for blkmirror makes it in 3293 */ 3294 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3295 int job_flags = JOB_DEFAULT; 3296 3297 if (!has_speed) { 3298 speed = 0; 3299 } 3300 if (!has_filter_node_name) { 3301 filter_node_name = NULL; 3302 } 3303 if (has_auto_finalize && !auto_finalize) { 3304 job_flags |= JOB_MANUAL_FINALIZE; 3305 } 3306 if (has_auto_dismiss && !auto_dismiss) { 3307 job_flags |= JOB_MANUAL_DISMISS; 3308 } 3309 3310 /* Important Note: 3311 * libvirt relies on the DeviceNotFound error class in order to probe for 3312 * live commit feature versions; for this to work, we must make sure to 3313 * perform the device lookup before any generic errors that may occur in a 3314 * scenario in which all optional arguments are omitted. */ 3315 bs = qmp_get_root_bs(device, &local_err); 3316 if (!bs) { 3317 bs = bdrv_lookup_bs(device, device, NULL); 3318 if (!bs) { 3319 error_free(local_err); 3320 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3321 "Device '%s' not found", device); 3322 } else { 3323 error_propagate(errp, local_err); 3324 } 3325 return; 3326 } 3327 3328 aio_context = bdrv_get_aio_context(bs); 3329 aio_context_acquire(aio_context); 3330 3331 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3332 goto out; 3333 } 3334 3335 /* default top_bs is the active layer */ 3336 top_bs = bs; 3337 3338 if (has_top_node && has_top) { 3339 error_setg(errp, "'top-node' and 'top' are mutually exclusive"); 3340 goto out; 3341 } else if (has_top_node) { 3342 top_bs = bdrv_lookup_bs(NULL, top_node, errp); 3343 if (top_bs == NULL) { 3344 goto out; 3345 } 3346 if (!bdrv_chain_contains(bs, top_bs)) { 3347 error_setg(errp, "'%s' is not in this backing file chain", 3348 top_node); 3349 goto out; 3350 } 3351 } else if (has_top && top) { 3352 /* This strcmp() is just a shortcut, there is no need to 3353 * refresh @bs's filename. If it mismatches, 3354 * bdrv_find_backing_image() will do the refresh and may still 3355 * return @bs. */ 3356 if (strcmp(bs->filename, top) != 0) { 3357 top_bs = bdrv_find_backing_image(bs, top); 3358 } 3359 } 3360 3361 if (top_bs == NULL) { 3362 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3363 goto out; 3364 } 3365 3366 assert(bdrv_get_aio_context(top_bs) == aio_context); 3367 3368 if (has_base_node && has_base) { 3369 error_setg(errp, "'base-node' and 'base' are mutually exclusive"); 3370 goto out; 3371 } else if (has_base_node) { 3372 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3373 if (base_bs == NULL) { 3374 goto out; 3375 } 3376 if (!bdrv_chain_contains(top_bs, base_bs)) { 3377 error_setg(errp, "'%s' is not in this backing file chain", 3378 base_node); 3379 goto out; 3380 } 3381 } else if (has_base && base) { 3382 base_bs = bdrv_find_backing_image(top_bs, base); 3383 } else { 3384 base_bs = bdrv_find_base(top_bs); 3385 } 3386 3387 if (base_bs == NULL) { 3388 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3389 goto out; 3390 } 3391 3392 assert(bdrv_get_aio_context(base_bs) == aio_context); 3393 3394 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3395 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3396 goto out; 3397 } 3398 } 3399 3400 /* Do not allow attempts to commit an image into itself */ 3401 if (top_bs == base_bs) { 3402 error_setg(errp, "cannot commit an image into itself"); 3403 goto out; 3404 } 3405 3406 if (top_bs == bs) { 3407 if (has_backing_file) { 3408 error_setg(errp, "'backing-file' specified," 3409 " but 'top' is the active layer"); 3410 goto out; 3411 } 3412 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3413 job_flags, speed, on_error, 3414 filter_node_name, NULL, NULL, false, &local_err); 3415 } else { 3416 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3417 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3418 goto out; 3419 } 3420 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, 3421 speed, on_error, has_backing_file ? backing_file : NULL, 3422 filter_node_name, &local_err); 3423 } 3424 if (local_err != NULL) { 3425 error_propagate(errp, local_err); 3426 goto out; 3427 } 3428 3429 out: 3430 aio_context_release(aio_context); 3431 } 3432 3433 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3434 Error **errp) 3435 { 3436 BlockDriverState *bs; 3437 BlockDriverState *target_bs; 3438 BlockDriverState *source = NULL; 3439 BlockJob *job = NULL; 3440 BdrvDirtyBitmap *bmap = NULL; 3441 AioContext *aio_context; 3442 QDict *options = NULL; 3443 Error *local_err = NULL; 3444 int flags, job_flags = JOB_DEFAULT; 3445 int64_t size; 3446 bool set_backing_hd = false; 3447 int ret; 3448 3449 if (!backup->has_speed) { 3450 backup->speed = 0; 3451 } 3452 if (!backup->has_on_source_error) { 3453 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3454 } 3455 if (!backup->has_on_target_error) { 3456 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3457 } 3458 if (!backup->has_mode) { 3459 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3460 } 3461 if (!backup->has_job_id) { 3462 backup->job_id = NULL; 3463 } 3464 if (!backup->has_auto_finalize) { 3465 backup->auto_finalize = true; 3466 } 3467 if (!backup->has_auto_dismiss) { 3468 backup->auto_dismiss = true; 3469 } 3470 if (!backup->has_compress) { 3471 backup->compress = false; 3472 } 3473 3474 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3475 if (!bs) { 3476 return NULL; 3477 } 3478 3479 if (!bs->drv) { 3480 error_setg(errp, "Device has no medium"); 3481 return NULL; 3482 } 3483 3484 aio_context = bdrv_get_aio_context(bs); 3485 aio_context_acquire(aio_context); 3486 3487 if (!backup->has_format) { 3488 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3489 NULL : (char*) bs->drv->format_name; 3490 } 3491 3492 /* Early check to avoid creating target */ 3493 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3494 goto out; 3495 } 3496 3497 flags = bs->open_flags | BDRV_O_RDWR; 3498 3499 /* See if we have a backing HD we can use to create our new image 3500 * on top of. */ 3501 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3502 source = backing_bs(bs); 3503 if (!source) { 3504 backup->sync = MIRROR_SYNC_MODE_FULL; 3505 } 3506 } 3507 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3508 source = bs; 3509 flags |= BDRV_O_NO_BACKING; 3510 set_backing_hd = true; 3511 } 3512 3513 size = bdrv_getlength(bs); 3514 if (size < 0) { 3515 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3516 goto out; 3517 } 3518 3519 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3520 assert(backup->format); 3521 if (source) { 3522 bdrv_refresh_filename(source); 3523 bdrv_img_create(backup->target, backup->format, source->filename, 3524 source->drv->format_name, NULL, 3525 size, flags, false, &local_err); 3526 } else { 3527 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3528 size, flags, false, &local_err); 3529 } 3530 } 3531 3532 if (local_err) { 3533 error_propagate(errp, local_err); 3534 goto out; 3535 } 3536 3537 if (backup->format) { 3538 if (!options) { 3539 options = qdict_new(); 3540 } 3541 qdict_put_str(options, "driver", backup->format); 3542 } 3543 3544 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3545 if (!target_bs) { 3546 goto out; 3547 } 3548 3549 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3550 if (ret < 0) { 3551 bdrv_unref(target_bs); 3552 goto out; 3553 } 3554 3555 if (set_backing_hd) { 3556 bdrv_set_backing_hd(target_bs, source, &local_err); 3557 if (local_err) { 3558 goto unref; 3559 } 3560 } 3561 3562 if (backup->has_bitmap) { 3563 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3564 if (!bmap) { 3565 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3566 goto unref; 3567 } 3568 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3569 goto unref; 3570 } 3571 } 3572 if (!backup->auto_finalize) { 3573 job_flags |= JOB_MANUAL_FINALIZE; 3574 } 3575 if (!backup->auto_dismiss) { 3576 job_flags |= JOB_MANUAL_DISMISS; 3577 } 3578 3579 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3580 backup->sync, bmap, backup->compress, 3581 backup->on_source_error, backup->on_target_error, 3582 job_flags, NULL, NULL, txn, &local_err); 3583 if (local_err != NULL) { 3584 error_propagate(errp, local_err); 3585 goto unref; 3586 } 3587 3588 unref: 3589 bdrv_unref(target_bs); 3590 out: 3591 aio_context_release(aio_context); 3592 return job; 3593 } 3594 3595 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3596 { 3597 3598 BlockJob *job; 3599 job = do_drive_backup(arg, NULL, errp); 3600 if (job) { 3601 job_start(&job->job); 3602 } 3603 } 3604 3605 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3606 { 3607 return bdrv_named_nodes_list(errp); 3608 } 3609 3610 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) 3611 { 3612 return bdrv_get_xdbg_block_graph(errp); 3613 } 3614 3615 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3616 Error **errp) 3617 { 3618 BlockDriverState *bs; 3619 BlockDriverState *target_bs; 3620 Error *local_err = NULL; 3621 BdrvDirtyBitmap *bmap = NULL; 3622 AioContext *aio_context; 3623 BlockJob *job = NULL; 3624 int job_flags = JOB_DEFAULT; 3625 int ret; 3626 3627 if (!backup->has_speed) { 3628 backup->speed = 0; 3629 } 3630 if (!backup->has_on_source_error) { 3631 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3632 } 3633 if (!backup->has_on_target_error) { 3634 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3635 } 3636 if (!backup->has_job_id) { 3637 backup->job_id = NULL; 3638 } 3639 if (!backup->has_auto_finalize) { 3640 backup->auto_finalize = true; 3641 } 3642 if (!backup->has_auto_dismiss) { 3643 backup->auto_dismiss = true; 3644 } 3645 if (!backup->has_compress) { 3646 backup->compress = false; 3647 } 3648 3649 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3650 if (!bs) { 3651 return NULL; 3652 } 3653 3654 aio_context = bdrv_get_aio_context(bs); 3655 aio_context_acquire(aio_context); 3656 3657 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3658 if (!target_bs) { 3659 goto out; 3660 } 3661 3662 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3663 if (ret < 0) { 3664 goto out; 3665 } 3666 3667 if (backup->has_bitmap) { 3668 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3669 if (!bmap) { 3670 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3671 goto out; 3672 } 3673 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) { 3674 goto out; 3675 } 3676 } 3677 3678 if (!backup->auto_finalize) { 3679 job_flags |= JOB_MANUAL_FINALIZE; 3680 } 3681 if (!backup->auto_dismiss) { 3682 job_flags |= JOB_MANUAL_DISMISS; 3683 } 3684 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3685 backup->sync, bmap, backup->compress, 3686 backup->on_source_error, backup->on_target_error, 3687 job_flags, NULL, NULL, txn, &local_err); 3688 if (local_err != NULL) { 3689 error_propagate(errp, local_err); 3690 } 3691 out: 3692 aio_context_release(aio_context); 3693 return job; 3694 } 3695 3696 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3697 { 3698 BlockJob *job; 3699 job = do_blockdev_backup(arg, NULL, errp); 3700 if (job) { 3701 job_start(&job->job); 3702 } 3703 } 3704 3705 /* Parameter check and block job starting for drive mirroring. 3706 * Caller should hold @device and @target's aio context (must be the same). 3707 **/ 3708 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3709 BlockDriverState *target, 3710 bool has_replaces, const char *replaces, 3711 enum MirrorSyncMode sync, 3712 BlockMirrorBackingMode backing_mode, 3713 bool has_speed, int64_t speed, 3714 bool has_granularity, uint32_t granularity, 3715 bool has_buf_size, int64_t buf_size, 3716 bool has_on_source_error, 3717 BlockdevOnError on_source_error, 3718 bool has_on_target_error, 3719 BlockdevOnError on_target_error, 3720 bool has_unmap, bool unmap, 3721 bool has_filter_node_name, 3722 const char *filter_node_name, 3723 bool has_copy_mode, MirrorCopyMode copy_mode, 3724 bool has_auto_finalize, bool auto_finalize, 3725 bool has_auto_dismiss, bool auto_dismiss, 3726 Error **errp) 3727 { 3728 int job_flags = JOB_DEFAULT; 3729 3730 if (!has_speed) { 3731 speed = 0; 3732 } 3733 if (!has_on_source_error) { 3734 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3735 } 3736 if (!has_on_target_error) { 3737 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3738 } 3739 if (!has_granularity) { 3740 granularity = 0; 3741 } 3742 if (!has_buf_size) { 3743 buf_size = 0; 3744 } 3745 if (!has_unmap) { 3746 unmap = true; 3747 } 3748 if (!has_filter_node_name) { 3749 filter_node_name = NULL; 3750 } 3751 if (!has_copy_mode) { 3752 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3753 } 3754 if (has_auto_finalize && !auto_finalize) { 3755 job_flags |= JOB_MANUAL_FINALIZE; 3756 } 3757 if (has_auto_dismiss && !auto_dismiss) { 3758 job_flags |= JOB_MANUAL_DISMISS; 3759 } 3760 3761 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3762 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3763 "a value in range [512B, 64MB]"); 3764 return; 3765 } 3766 if (granularity & (granularity - 1)) { 3767 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3768 "power of 2"); 3769 return; 3770 } 3771 3772 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3773 return; 3774 } 3775 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3776 return; 3777 } 3778 3779 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3780 sync = MIRROR_SYNC_MODE_FULL; 3781 } 3782 3783 if (has_replaces) { 3784 BlockDriverState *to_replace_bs; 3785 AioContext *replace_aio_context; 3786 int64_t bs_size, replace_size; 3787 3788 bs_size = bdrv_getlength(bs); 3789 if (bs_size < 0) { 3790 error_setg_errno(errp, -bs_size, "Failed to query device's size"); 3791 return; 3792 } 3793 3794 to_replace_bs = check_to_replace_node(bs, replaces, errp); 3795 if (!to_replace_bs) { 3796 return; 3797 } 3798 3799 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3800 aio_context_acquire(replace_aio_context); 3801 replace_size = bdrv_getlength(to_replace_bs); 3802 aio_context_release(replace_aio_context); 3803 3804 if (replace_size < 0) { 3805 error_setg_errno(errp, -replace_size, 3806 "Failed to query the replacement node's size"); 3807 return; 3808 } 3809 if (bs_size != replace_size) { 3810 error_setg(errp, "cannot replace image with a mirror image of " 3811 "different size"); 3812 return; 3813 } 3814 } 3815 3816 /* pass the node name to replace to mirror start since it's loose coupling 3817 * and will allow to check whether the node still exist at mirror completion 3818 */ 3819 mirror_start(job_id, bs, target, 3820 has_replaces ? replaces : NULL, job_flags, 3821 speed, granularity, buf_size, sync, backing_mode, 3822 on_source_error, on_target_error, unmap, filter_node_name, 3823 copy_mode, errp); 3824 } 3825 3826 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3827 { 3828 BlockDriverState *bs; 3829 BlockDriverState *source, *target_bs; 3830 AioContext *aio_context; 3831 BlockMirrorBackingMode backing_mode; 3832 Error *local_err = NULL; 3833 QDict *options = NULL; 3834 int flags; 3835 int64_t size; 3836 const char *format = arg->format; 3837 int ret; 3838 3839 bs = qmp_get_root_bs(arg->device, errp); 3840 if (!bs) { 3841 return; 3842 } 3843 3844 /* Early check to avoid creating target */ 3845 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3846 return; 3847 } 3848 3849 aio_context = bdrv_get_aio_context(bs); 3850 aio_context_acquire(aio_context); 3851 3852 if (!arg->has_mode) { 3853 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3854 } 3855 3856 if (!arg->has_format) { 3857 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3858 ? NULL : bs->drv->format_name); 3859 } 3860 3861 flags = bs->open_flags | BDRV_O_RDWR; 3862 source = backing_bs(bs); 3863 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3864 arg->sync = MIRROR_SYNC_MODE_FULL; 3865 } 3866 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3867 source = bs; 3868 } 3869 3870 size = bdrv_getlength(bs); 3871 if (size < 0) { 3872 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3873 goto out; 3874 } 3875 3876 if (arg->has_replaces) { 3877 if (!arg->has_node_name) { 3878 error_setg(errp, "a node-name must be provided when replacing a" 3879 " named node of the graph"); 3880 goto out; 3881 } 3882 } 3883 3884 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3885 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3886 } else { 3887 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3888 } 3889 3890 /* Don't open backing image in create() */ 3891 flags |= BDRV_O_NO_BACKING; 3892 3893 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3894 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3895 { 3896 /* create new image w/o backing file */ 3897 assert(format); 3898 bdrv_img_create(arg->target, format, 3899 NULL, NULL, NULL, size, flags, false, &local_err); 3900 } else { 3901 switch (arg->mode) { 3902 case NEW_IMAGE_MODE_EXISTING: 3903 break; 3904 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3905 /* create new image with backing file */ 3906 bdrv_refresh_filename(source); 3907 bdrv_img_create(arg->target, format, 3908 source->filename, 3909 source->drv->format_name, 3910 NULL, size, flags, false, &local_err); 3911 break; 3912 default: 3913 abort(); 3914 } 3915 } 3916 3917 if (local_err) { 3918 error_propagate(errp, local_err); 3919 goto out; 3920 } 3921 3922 options = qdict_new(); 3923 if (arg->has_node_name) { 3924 qdict_put_str(options, "node-name", arg->node_name); 3925 } 3926 if (format) { 3927 qdict_put_str(options, "driver", format); 3928 } 3929 3930 /* Mirroring takes care of copy-on-write using the source's backing 3931 * file. 3932 */ 3933 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3934 if (!target_bs) { 3935 goto out; 3936 } 3937 3938 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 3939 if (ret < 0) { 3940 bdrv_unref(target_bs); 3941 goto out; 3942 } 3943 3944 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3945 arg->has_replaces, arg->replaces, arg->sync, 3946 backing_mode, arg->has_speed, arg->speed, 3947 arg->has_granularity, arg->granularity, 3948 arg->has_buf_size, arg->buf_size, 3949 arg->has_on_source_error, arg->on_source_error, 3950 arg->has_on_target_error, arg->on_target_error, 3951 arg->has_unmap, arg->unmap, 3952 false, NULL, 3953 arg->has_copy_mode, arg->copy_mode, 3954 arg->has_auto_finalize, arg->auto_finalize, 3955 arg->has_auto_dismiss, arg->auto_dismiss, 3956 &local_err); 3957 bdrv_unref(target_bs); 3958 error_propagate(errp, local_err); 3959 out: 3960 aio_context_release(aio_context); 3961 } 3962 3963 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3964 const char *device, const char *target, 3965 bool has_replaces, const char *replaces, 3966 MirrorSyncMode sync, 3967 bool has_speed, int64_t speed, 3968 bool has_granularity, uint32_t granularity, 3969 bool has_buf_size, int64_t buf_size, 3970 bool has_on_source_error, 3971 BlockdevOnError on_source_error, 3972 bool has_on_target_error, 3973 BlockdevOnError on_target_error, 3974 bool has_filter_node_name, 3975 const char *filter_node_name, 3976 bool has_copy_mode, MirrorCopyMode copy_mode, 3977 bool has_auto_finalize, bool auto_finalize, 3978 bool has_auto_dismiss, bool auto_dismiss, 3979 Error **errp) 3980 { 3981 BlockDriverState *bs; 3982 BlockDriverState *target_bs; 3983 AioContext *aio_context; 3984 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3985 Error *local_err = NULL; 3986 int ret; 3987 3988 bs = qmp_get_root_bs(device, errp); 3989 if (!bs) { 3990 return; 3991 } 3992 3993 target_bs = bdrv_lookup_bs(target, target, errp); 3994 if (!target_bs) { 3995 return; 3996 } 3997 3998 aio_context = bdrv_get_aio_context(bs); 3999 aio_context_acquire(aio_context); 4000 4001 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); 4002 if (ret < 0) { 4003 goto out; 4004 } 4005 4006 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 4007 has_replaces, replaces, sync, backing_mode, 4008 has_speed, speed, 4009 has_granularity, granularity, 4010 has_buf_size, buf_size, 4011 has_on_source_error, on_source_error, 4012 has_on_target_error, on_target_error, 4013 true, true, 4014 has_filter_node_name, filter_node_name, 4015 has_copy_mode, copy_mode, 4016 has_auto_finalize, auto_finalize, 4017 has_auto_dismiss, auto_dismiss, 4018 &local_err); 4019 error_propagate(errp, local_err); 4020 out: 4021 aio_context_release(aio_context); 4022 } 4023 4024 /* Get a block job using its ID and acquire its AioContext */ 4025 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 4026 Error **errp) 4027 { 4028 BlockJob *job; 4029 4030 assert(id != NULL); 4031 4032 *aio_context = NULL; 4033 4034 job = block_job_get(id); 4035 4036 if (!job) { 4037 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 4038 "Block job '%s' not found", id); 4039 return NULL; 4040 } 4041 4042 *aio_context = blk_get_aio_context(job->blk); 4043 aio_context_acquire(*aio_context); 4044 4045 return job; 4046 } 4047 4048 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 4049 { 4050 AioContext *aio_context; 4051 BlockJob *job = find_block_job(device, &aio_context, errp); 4052 4053 if (!job) { 4054 return; 4055 } 4056 4057 block_job_set_speed(job, speed, errp); 4058 aio_context_release(aio_context); 4059 } 4060 4061 void qmp_block_job_cancel(const char *device, 4062 bool has_force, bool force, Error **errp) 4063 { 4064 AioContext *aio_context; 4065 BlockJob *job = find_block_job(device, &aio_context, errp); 4066 4067 if (!job) { 4068 return; 4069 } 4070 4071 if (!has_force) { 4072 force = false; 4073 } 4074 4075 if (job_user_paused(&job->job) && !force) { 4076 error_setg(errp, "The block job for device '%s' is currently paused", 4077 device); 4078 goto out; 4079 } 4080 4081 trace_qmp_block_job_cancel(job); 4082 job_user_cancel(&job->job, force, errp); 4083 out: 4084 aio_context_release(aio_context); 4085 } 4086 4087 void qmp_block_job_pause(const char *device, Error **errp) 4088 { 4089 AioContext *aio_context; 4090 BlockJob *job = find_block_job(device, &aio_context, errp); 4091 4092 if (!job) { 4093 return; 4094 } 4095 4096 trace_qmp_block_job_pause(job); 4097 job_user_pause(&job->job, errp); 4098 aio_context_release(aio_context); 4099 } 4100 4101 void qmp_block_job_resume(const char *device, Error **errp) 4102 { 4103 AioContext *aio_context; 4104 BlockJob *job = find_block_job(device, &aio_context, errp); 4105 4106 if (!job) { 4107 return; 4108 } 4109 4110 trace_qmp_block_job_resume(job); 4111 job_user_resume(&job->job, errp); 4112 aio_context_release(aio_context); 4113 } 4114 4115 void qmp_block_job_complete(const char *device, Error **errp) 4116 { 4117 AioContext *aio_context; 4118 BlockJob *job = find_block_job(device, &aio_context, errp); 4119 4120 if (!job) { 4121 return; 4122 } 4123 4124 trace_qmp_block_job_complete(job); 4125 job_complete(&job->job, errp); 4126 aio_context_release(aio_context); 4127 } 4128 4129 void qmp_block_job_finalize(const char *id, Error **errp) 4130 { 4131 AioContext *aio_context; 4132 BlockJob *job = find_block_job(id, &aio_context, errp); 4133 4134 if (!job) { 4135 return; 4136 } 4137 4138 trace_qmp_block_job_finalize(job); 4139 job_finalize(&job->job, errp); 4140 aio_context_release(aio_context); 4141 } 4142 4143 void qmp_block_job_dismiss(const char *id, Error **errp) 4144 { 4145 AioContext *aio_context; 4146 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4147 Job *job; 4148 4149 if (!bjob) { 4150 return; 4151 } 4152 4153 trace_qmp_block_job_dismiss(bjob); 4154 job = &bjob->job; 4155 job_dismiss(&job, errp); 4156 aio_context_release(aio_context); 4157 } 4158 4159 void qmp_change_backing_file(const char *device, 4160 const char *image_node_name, 4161 const char *backing_file, 4162 Error **errp) 4163 { 4164 BlockDriverState *bs = NULL; 4165 AioContext *aio_context; 4166 BlockDriverState *image_bs = NULL; 4167 Error *local_err = NULL; 4168 bool ro; 4169 int ret; 4170 4171 bs = qmp_get_root_bs(device, errp); 4172 if (!bs) { 4173 return; 4174 } 4175 4176 aio_context = bdrv_get_aio_context(bs); 4177 aio_context_acquire(aio_context); 4178 4179 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4180 if (local_err) { 4181 error_propagate(errp, local_err); 4182 goto out; 4183 } 4184 4185 if (!image_bs) { 4186 error_setg(errp, "image file not found"); 4187 goto out; 4188 } 4189 4190 if (bdrv_find_base(image_bs) == image_bs) { 4191 error_setg(errp, "not allowing backing file change on an image " 4192 "without a backing file"); 4193 goto out; 4194 } 4195 4196 /* even though we are not necessarily operating on bs, we need it to 4197 * determine if block ops are currently prohibited on the chain */ 4198 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4199 goto out; 4200 } 4201 4202 /* final sanity check */ 4203 if (!bdrv_chain_contains(bs, image_bs)) { 4204 error_setg(errp, "'%s' and image file are not in the same chain", 4205 device); 4206 goto out; 4207 } 4208 4209 /* if not r/w, reopen to make r/w */ 4210 ro = bdrv_is_read_only(image_bs); 4211 4212 if (ro) { 4213 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { 4214 goto out; 4215 } 4216 } 4217 4218 ret = bdrv_change_backing_file(image_bs, backing_file, 4219 image_bs->drv ? image_bs->drv->format_name : ""); 4220 4221 if (ret < 0) { 4222 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4223 backing_file); 4224 /* don't exit here, so we can try to restore open flags if 4225 * appropriate */ 4226 } 4227 4228 if (ro) { 4229 bdrv_reopen_set_read_only(image_bs, true, &local_err); 4230 error_propagate(errp, local_err); 4231 } 4232 4233 out: 4234 aio_context_release(aio_context); 4235 } 4236 4237 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4238 { 4239 QemuOpts *opts; 4240 QDict *qdict; 4241 Error *local_err = NULL; 4242 4243 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4244 if (!opts) { 4245 return; 4246 } 4247 4248 qdict = qemu_opts_to_qdict(opts, NULL); 4249 4250 if (!qdict_get_try_str(qdict, "node-name")) { 4251 qobject_unref(qdict); 4252 error_report("'node-name' needs to be specified"); 4253 goto out; 4254 } 4255 4256 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4257 if (!bs) { 4258 error_report_err(local_err); 4259 goto out; 4260 } 4261 4262 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4263 4264 out: 4265 qemu_opts_del(opts); 4266 } 4267 4268 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4269 { 4270 BlockDriverState *bs; 4271 QObject *obj; 4272 Visitor *v = qobject_output_visitor_new(&obj); 4273 QDict *qdict; 4274 Error *local_err = NULL; 4275 4276 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4277 if (local_err) { 4278 error_propagate(errp, local_err); 4279 goto fail; 4280 } 4281 4282 visit_complete(v, &obj); 4283 qdict = qobject_to(QDict, obj); 4284 4285 qdict_flatten(qdict); 4286 4287 if (!qdict_get_try_str(qdict, "node-name")) { 4288 error_setg(errp, "'node-name' must be specified for the root node"); 4289 goto fail; 4290 } 4291 4292 bs = bds_tree_init(qdict, errp); 4293 if (!bs) { 4294 goto fail; 4295 } 4296 4297 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4298 4299 fail: 4300 visit_free(v); 4301 } 4302 4303 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) 4304 { 4305 BlockDriverState *bs; 4306 AioContext *ctx; 4307 QObject *obj; 4308 Visitor *v = qobject_output_visitor_new(&obj); 4309 Error *local_err = NULL; 4310 BlockReopenQueue *queue; 4311 QDict *qdict; 4312 4313 /* Check for the selected node name */ 4314 if (!options->has_node_name) { 4315 error_setg(errp, "Node name not specified"); 4316 goto fail; 4317 } 4318 4319 bs = bdrv_find_node(options->node_name); 4320 if (!bs) { 4321 error_setg(errp, "Cannot find node named '%s'", options->node_name); 4322 goto fail; 4323 } 4324 4325 /* Put all options in a QDict and flatten it */ 4326 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4327 if (local_err) { 4328 error_propagate(errp, local_err); 4329 goto fail; 4330 } 4331 4332 visit_complete(v, &obj); 4333 qdict = qobject_to(QDict, obj); 4334 4335 qdict_flatten(qdict); 4336 4337 /* Perform the reopen operation */ 4338 ctx = bdrv_get_aio_context(bs); 4339 aio_context_acquire(ctx); 4340 bdrv_subtree_drained_begin(bs); 4341 queue = bdrv_reopen_queue(NULL, bs, qdict, false); 4342 bdrv_reopen_multiple(queue, errp); 4343 bdrv_subtree_drained_end(bs); 4344 aio_context_release(ctx); 4345 4346 fail: 4347 visit_free(v); 4348 } 4349 4350 void qmp_blockdev_del(const char *node_name, Error **errp) 4351 { 4352 AioContext *aio_context; 4353 BlockDriverState *bs; 4354 4355 bs = bdrv_find_node(node_name); 4356 if (!bs) { 4357 error_setg(errp, "Cannot find node %s", node_name); 4358 return; 4359 } 4360 if (bdrv_has_blk(bs)) { 4361 error_setg(errp, "Node %s is in use", node_name); 4362 return; 4363 } 4364 aio_context = bdrv_get_aio_context(bs); 4365 aio_context_acquire(aio_context); 4366 4367 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4368 goto out; 4369 } 4370 4371 if (!QTAILQ_IN_USE(bs, monitor_list)) { 4372 error_setg(errp, "Node %s is not owned by the monitor", 4373 bs->node_name); 4374 goto out; 4375 } 4376 4377 if (bs->refcnt > 1) { 4378 error_setg(errp, "Block device %s is in use", 4379 bdrv_get_device_or_node_name(bs)); 4380 goto out; 4381 } 4382 4383 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4384 bdrv_unref(bs); 4385 4386 out: 4387 aio_context_release(aio_context); 4388 } 4389 4390 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4391 const char *child_name) 4392 { 4393 BdrvChild *child; 4394 4395 QLIST_FOREACH(child, &parent_bs->children, next) { 4396 if (strcmp(child->name, child_name) == 0) { 4397 return child; 4398 } 4399 } 4400 4401 return NULL; 4402 } 4403 4404 void qmp_x_blockdev_change(const char *parent, bool has_child, 4405 const char *child, bool has_node, 4406 const char *node, Error **errp) 4407 { 4408 BlockDriverState *parent_bs, *new_bs = NULL; 4409 BdrvChild *p_child; 4410 4411 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4412 if (!parent_bs) { 4413 return; 4414 } 4415 4416 if (has_child == has_node) { 4417 if (has_child) { 4418 error_setg(errp, "The parameters child and node are in conflict"); 4419 } else { 4420 error_setg(errp, "Either child or node must be specified"); 4421 } 4422 return; 4423 } 4424 4425 if (has_child) { 4426 p_child = bdrv_find_child(parent_bs, child); 4427 if (!p_child) { 4428 error_setg(errp, "Node '%s' does not have child '%s'", 4429 parent, child); 4430 return; 4431 } 4432 bdrv_del_child(parent_bs, p_child, errp); 4433 } 4434 4435 if (has_node) { 4436 new_bs = bdrv_find_node(node); 4437 if (!new_bs) { 4438 error_setg(errp, "Node '%s' not found", node); 4439 return; 4440 } 4441 bdrv_add_child(parent_bs, new_bs, errp); 4442 } 4443 } 4444 4445 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4446 { 4447 BlockJobInfoList *head = NULL, **p_next = &head; 4448 BlockJob *job; 4449 4450 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4451 BlockJobInfoList *elem; 4452 AioContext *aio_context; 4453 4454 if (block_job_is_internal(job)) { 4455 continue; 4456 } 4457 elem = g_new0(BlockJobInfoList, 1); 4458 aio_context = blk_get_aio_context(job->blk); 4459 aio_context_acquire(aio_context); 4460 elem->value = block_job_query(job, errp); 4461 aio_context_release(aio_context); 4462 if (!elem->value) { 4463 g_free(elem); 4464 qapi_free_BlockJobInfoList(head); 4465 return NULL; 4466 } 4467 *p_next = elem; 4468 p_next = &elem->next; 4469 } 4470 4471 return head; 4472 } 4473 4474 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4475 bool has_force, bool force, Error **errp) 4476 { 4477 AioContext *old_context; 4478 AioContext *new_context; 4479 BlockDriverState *bs; 4480 4481 bs = bdrv_find_node(node_name); 4482 if (!bs) { 4483 error_setg(errp, "Cannot find node %s", node_name); 4484 return; 4485 } 4486 4487 /* Protects against accidents. */ 4488 if (!(has_force && force) && bdrv_has_blk(bs)) { 4489 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4490 "be in use (use force=true to override this check)", 4491 node_name); 4492 return; 4493 } 4494 4495 if (iothread->type == QTYPE_QSTRING) { 4496 IOThread *obj = iothread_by_id(iothread->u.s); 4497 if (!obj) { 4498 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4499 return; 4500 } 4501 4502 new_context = iothread_get_aio_context(obj); 4503 } else { 4504 new_context = qemu_get_aio_context(); 4505 } 4506 4507 old_context = bdrv_get_aio_context(bs); 4508 aio_context_acquire(old_context); 4509 4510 bdrv_try_set_aio_context(bs, new_context, errp); 4511 4512 aio_context_release(old_context); 4513 } 4514 4515 void qmp_block_latency_histogram_set( 4516 const char *id, 4517 bool has_boundaries, uint64List *boundaries, 4518 bool has_boundaries_read, uint64List *boundaries_read, 4519 bool has_boundaries_write, uint64List *boundaries_write, 4520 bool has_boundaries_flush, uint64List *boundaries_flush, 4521 Error **errp) 4522 { 4523 BlockBackend *blk = qmp_get_blk(NULL, id, errp); 4524 BlockAcctStats *stats; 4525 int ret; 4526 4527 if (!blk) { 4528 return; 4529 } 4530 4531 stats = blk_get_stats(blk); 4532 4533 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4534 !has_boundaries_flush) 4535 { 4536 block_latency_histograms_clear(stats); 4537 return; 4538 } 4539 4540 if (has_boundaries || has_boundaries_read) { 4541 ret = block_latency_histogram_set( 4542 stats, BLOCK_ACCT_READ, 4543 has_boundaries_read ? boundaries_read : boundaries); 4544 if (ret) { 4545 error_setg(errp, "Device '%s' set read boundaries fail", id); 4546 return; 4547 } 4548 } 4549 4550 if (has_boundaries || has_boundaries_write) { 4551 ret = block_latency_histogram_set( 4552 stats, BLOCK_ACCT_WRITE, 4553 has_boundaries_write ? boundaries_write : boundaries); 4554 if (ret) { 4555 error_setg(errp, "Device '%s' set write boundaries fail", id); 4556 return; 4557 } 4558 } 4559 4560 if (has_boundaries || has_boundaries_flush) { 4561 ret = block_latency_histogram_set( 4562 stats, BLOCK_ACCT_FLUSH, 4563 has_boundaries_flush ? boundaries_flush : boundaries); 4564 if (ret) { 4565 error_setg(errp, "Device '%s' set flush boundaries fail", id); 4566 return; 4567 } 4568 } 4569 } 4570 4571 QemuOptsList qemu_common_drive_opts = { 4572 .name = "drive", 4573 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4574 .desc = { 4575 { 4576 .name = "snapshot", 4577 .type = QEMU_OPT_BOOL, 4578 .help = "enable/disable snapshot mode", 4579 },{ 4580 .name = "aio", 4581 .type = QEMU_OPT_STRING, 4582 .help = "host AIO implementation (threads, native)", 4583 },{ 4584 .name = BDRV_OPT_CACHE_WB, 4585 .type = QEMU_OPT_BOOL, 4586 .help = "Enable writeback mode", 4587 },{ 4588 .name = "format", 4589 .type = QEMU_OPT_STRING, 4590 .help = "disk format (raw, qcow2, ...)", 4591 },{ 4592 .name = "rerror", 4593 .type = QEMU_OPT_STRING, 4594 .help = "read error action", 4595 },{ 4596 .name = "werror", 4597 .type = QEMU_OPT_STRING, 4598 .help = "write error action", 4599 },{ 4600 .name = BDRV_OPT_READ_ONLY, 4601 .type = QEMU_OPT_BOOL, 4602 .help = "open drive file as read-only", 4603 }, 4604 4605 THROTTLE_OPTS, 4606 4607 { 4608 .name = "throttling.group", 4609 .type = QEMU_OPT_STRING, 4610 .help = "name of the block throttling group", 4611 },{ 4612 .name = "copy-on-read", 4613 .type = QEMU_OPT_BOOL, 4614 .help = "copy read data from backing file into image file", 4615 },{ 4616 .name = "detect-zeroes", 4617 .type = QEMU_OPT_STRING, 4618 .help = "try to optimize zero writes (off, on, unmap)", 4619 },{ 4620 .name = "stats-account-invalid", 4621 .type = QEMU_OPT_BOOL, 4622 .help = "whether to account for invalid I/O operations " 4623 "in the statistics", 4624 },{ 4625 .name = "stats-account-failed", 4626 .type = QEMU_OPT_BOOL, 4627 .help = "whether to account for failed I/O operations " 4628 "in the statistics", 4629 }, 4630 { /* end of list */ } 4631 }, 4632 }; 4633 4634 QemuOptsList qemu_drive_opts = { 4635 .name = "drive", 4636 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4637 .desc = { 4638 /* 4639 * no elements => accept any params 4640 * validation will happen later 4641 */ 4642 { /* end of list */ } 4643 }, 4644 }; 4645