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