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