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