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 = "cyls", 735 .type = QEMU_OPT_NUMBER, 736 .help = "number of cylinders (ide disk geometry)", 737 },{ 738 .name = "heads", 739 .type = QEMU_OPT_NUMBER, 740 .help = "number of heads (ide disk geometry)", 741 },{ 742 .name = "secs", 743 .type = QEMU_OPT_NUMBER, 744 .help = "number of sectors (ide disk geometry)", 745 },{ 746 .name = "trans", 747 .type = QEMU_OPT_STRING, 748 .help = "chs translation (auto, lba, none)", 749 },{ 750 .name = "addr", 751 .type = QEMU_OPT_STRING, 752 .help = "pci address (virtio only)", 753 },{ 754 .name = "serial", 755 .type = QEMU_OPT_STRING, 756 .help = "disk serial number", 757 },{ 758 .name = "file", 759 .type = QEMU_OPT_STRING, 760 .help = "file name", 761 }, 762 763 /* Options that are passed on, but have special semantics with -drive */ 764 { 765 .name = BDRV_OPT_READ_ONLY, 766 .type = QEMU_OPT_BOOL, 767 .help = "open drive file as read-only", 768 },{ 769 .name = "rerror", 770 .type = QEMU_OPT_STRING, 771 .help = "read error action", 772 },{ 773 .name = "werror", 774 .type = QEMU_OPT_STRING, 775 .help = "write error action", 776 },{ 777 .name = "copy-on-read", 778 .type = QEMU_OPT_BOOL, 779 .help = "copy read data from backing file into image file", 780 }, 781 782 { /* end of list */ } 783 }, 784 }; 785 786 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 787 { 788 const char *value; 789 BlockBackend *blk; 790 DriveInfo *dinfo = NULL; 791 QDict *bs_opts; 792 QemuOpts *legacy_opts; 793 DriveMediaType media = MEDIA_DISK; 794 BlockInterfaceType type; 795 int cyls, heads, secs, translation; 796 int max_devs, bus_id, unit_id, index; 797 const char *devaddr; 798 const char *werror, *rerror; 799 bool read_only = false; 800 bool copy_on_read; 801 const char *serial; 802 const char *filename; 803 Error *local_err = NULL; 804 int i; 805 const char *deprecated[] = { 806 "serial", "trans", "secs", "heads", "cyls", "addr" 807 }; 808 809 /* Change legacy command line options into QMP ones */ 810 static const struct { 811 const char *from; 812 const char *to; 813 } opt_renames[] = { 814 { "iops", "throttling.iops-total" }, 815 { "iops_rd", "throttling.iops-read" }, 816 { "iops_wr", "throttling.iops-write" }, 817 818 { "bps", "throttling.bps-total" }, 819 { "bps_rd", "throttling.bps-read" }, 820 { "bps_wr", "throttling.bps-write" }, 821 822 { "iops_max", "throttling.iops-total-max" }, 823 { "iops_rd_max", "throttling.iops-read-max" }, 824 { "iops_wr_max", "throttling.iops-write-max" }, 825 826 { "bps_max", "throttling.bps-total-max" }, 827 { "bps_rd_max", "throttling.bps-read-max" }, 828 { "bps_wr_max", "throttling.bps-write-max" }, 829 830 { "iops_size", "throttling.iops-size" }, 831 832 { "group", "throttling.group" }, 833 834 { "readonly", BDRV_OPT_READ_ONLY }, 835 }; 836 837 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 838 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 839 &local_err); 840 if (local_err) { 841 error_report_err(local_err); 842 return NULL; 843 } 844 } 845 846 value = qemu_opt_get(all_opts, "cache"); 847 if (value) { 848 int flags = 0; 849 bool writethrough; 850 851 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 852 error_report("invalid cache option"); 853 return NULL; 854 } 855 856 /* Specific options take precedence */ 857 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 858 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 859 !writethrough, &error_abort); 860 } 861 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 862 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 863 !!(flags & BDRV_O_NOCACHE), &error_abort); 864 } 865 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 866 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 867 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 868 } 869 qemu_opt_unset(all_opts, "cache"); 870 } 871 872 /* Get a QDict for processing the options */ 873 bs_opts = qdict_new(); 874 qemu_opts_to_qdict(all_opts, bs_opts); 875 876 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 877 &error_abort); 878 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 879 if (local_err) { 880 error_report_err(local_err); 881 goto fail; 882 } 883 884 /* Other deprecated options */ 885 if (!qtest_enabled()) { 886 for (i = 0; i < ARRAY_SIZE(deprecated); i++) { 887 if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) { 888 error_report("'%s' is deprecated, please use the corresponding " 889 "option of '-device' instead", deprecated[i]); 890 } 891 } 892 } 893 894 /* Media type */ 895 value = qemu_opt_get(legacy_opts, "media"); 896 if (value) { 897 if (!strcmp(value, "disk")) { 898 media = MEDIA_DISK; 899 } else if (!strcmp(value, "cdrom")) { 900 media = MEDIA_CDROM; 901 read_only = true; 902 } else { 903 error_report("'%s' invalid media", value); 904 goto fail; 905 } 906 } 907 908 /* copy-on-read is disabled with a warning for read-only devices */ 909 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); 910 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 911 912 if (read_only && copy_on_read) { 913 warn_report("disabling copy-on-read on read-only drive"); 914 copy_on_read = false; 915 } 916 917 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); 918 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); 919 920 /* Controller type */ 921 value = qemu_opt_get(legacy_opts, "if"); 922 if (value) { 923 for (type = 0; 924 type < IF_COUNT && strcmp(value, if_name[type]); 925 type++) { 926 } 927 if (type == IF_COUNT) { 928 error_report("unsupported bus type '%s'", value); 929 goto fail; 930 } 931 } else { 932 type = block_default_type; 933 } 934 935 /* Geometry */ 936 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 937 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 938 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 939 940 if (cyls || heads || secs) { 941 if (cyls < 1) { 942 error_report("invalid physical cyls number"); 943 goto fail; 944 } 945 if (heads < 1) { 946 error_report("invalid physical heads number"); 947 goto fail; 948 } 949 if (secs < 1) { 950 error_report("invalid physical secs number"); 951 goto fail; 952 } 953 } 954 955 translation = BIOS_ATA_TRANSLATION_AUTO; 956 value = qemu_opt_get(legacy_opts, "trans"); 957 if (value != NULL) { 958 if (!cyls) { 959 error_report("'%s' trans must be used with cyls, heads and secs", 960 value); 961 goto fail; 962 } 963 if (!strcmp(value, "none")) { 964 translation = BIOS_ATA_TRANSLATION_NONE; 965 } else if (!strcmp(value, "lba")) { 966 translation = BIOS_ATA_TRANSLATION_LBA; 967 } else if (!strcmp(value, "large")) { 968 translation = BIOS_ATA_TRANSLATION_LARGE; 969 } else if (!strcmp(value, "rechs")) { 970 translation = BIOS_ATA_TRANSLATION_RECHS; 971 } else if (!strcmp(value, "auto")) { 972 translation = BIOS_ATA_TRANSLATION_AUTO; 973 } else { 974 error_report("'%s' invalid translation type", value); 975 goto fail; 976 } 977 } 978 979 if (media == MEDIA_CDROM) { 980 if (cyls || secs || heads) { 981 error_report("CHS can't be set with media=cdrom"); 982 goto fail; 983 } 984 } 985 986 /* Device address specified by bus/unit or index. 987 * If none was specified, try to find the first free one. */ 988 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 989 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 990 index = qemu_opt_get_number(legacy_opts, "index", -1); 991 992 max_devs = if_max_devs[type]; 993 994 if (index != -1) { 995 if (bus_id != 0 || unit_id != -1) { 996 error_report("index cannot be used with bus and unit"); 997 goto fail; 998 } 999 bus_id = drive_index_to_bus_id(type, index); 1000 unit_id = drive_index_to_unit_id(type, index); 1001 } 1002 1003 if (unit_id == -1) { 1004 unit_id = 0; 1005 while (drive_get(type, bus_id, unit_id) != NULL) { 1006 unit_id++; 1007 if (max_devs && unit_id >= max_devs) { 1008 unit_id -= max_devs; 1009 bus_id++; 1010 } 1011 } 1012 } 1013 1014 if (max_devs && unit_id >= max_devs) { 1015 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 1016 goto fail; 1017 } 1018 1019 if (drive_get(type, bus_id, unit_id) != NULL) { 1020 error_report("drive with bus=%d, unit=%d (index=%d) exists", 1021 bus_id, unit_id, index); 1022 goto fail; 1023 } 1024 1025 /* Serial number */ 1026 serial = qemu_opt_get(legacy_opts, "serial"); 1027 1028 /* no id supplied -> create one */ 1029 if (qemu_opts_id(all_opts) == NULL) { 1030 char *new_id; 1031 const char *mediastr = ""; 1032 if (type == IF_IDE || type == IF_SCSI) { 1033 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 1034 } 1035 if (max_devs) { 1036 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 1037 mediastr, unit_id); 1038 } else { 1039 new_id = g_strdup_printf("%s%s%i", if_name[type], 1040 mediastr, unit_id); 1041 } 1042 qdict_put_str(bs_opts, "id", new_id); 1043 g_free(new_id); 1044 } 1045 1046 /* Add virtio block device */ 1047 devaddr = qemu_opt_get(legacy_opts, "addr"); 1048 if (devaddr && type != IF_VIRTIO) { 1049 error_report("addr is not supported by this bus type"); 1050 goto fail; 1051 } 1052 1053 if (type == IF_VIRTIO) { 1054 QemuOpts *devopts; 1055 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 1056 &error_abort); 1057 if (arch_type == QEMU_ARCH_S390X) { 1058 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 1059 } else { 1060 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 1061 } 1062 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 1063 &error_abort); 1064 if (devaddr) { 1065 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 1066 } 1067 } 1068 1069 filename = qemu_opt_get(legacy_opts, "file"); 1070 1071 /* Check werror/rerror compatibility with if=... */ 1072 werror = qemu_opt_get(legacy_opts, "werror"); 1073 if (werror != NULL) { 1074 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 1075 type != IF_NONE) { 1076 error_report("werror is not supported by this bus type"); 1077 goto fail; 1078 } 1079 qdict_put_str(bs_opts, "werror", werror); 1080 } 1081 1082 rerror = qemu_opt_get(legacy_opts, "rerror"); 1083 if (rerror != NULL) { 1084 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 1085 type != IF_NONE) { 1086 error_report("rerror is not supported by this bus type"); 1087 goto fail; 1088 } 1089 qdict_put_str(bs_opts, "rerror", rerror); 1090 } 1091 1092 /* Actual block device init: Functionality shared with blockdev-add */ 1093 blk = blockdev_init(filename, bs_opts, &local_err); 1094 bs_opts = NULL; 1095 if (!blk) { 1096 if (local_err) { 1097 error_report_err(local_err); 1098 } 1099 goto fail; 1100 } else { 1101 assert(!local_err); 1102 } 1103 1104 /* Create legacy DriveInfo */ 1105 dinfo = g_malloc0(sizeof(*dinfo)); 1106 dinfo->opts = all_opts; 1107 1108 dinfo->cyls = cyls; 1109 dinfo->heads = heads; 1110 dinfo->secs = secs; 1111 dinfo->trans = translation; 1112 1113 dinfo->type = type; 1114 dinfo->bus = bus_id; 1115 dinfo->unit = unit_id; 1116 dinfo->devaddr = devaddr; 1117 dinfo->serial = g_strdup(serial); 1118 1119 blk_set_legacy_dinfo(blk, dinfo); 1120 1121 switch(type) { 1122 case IF_IDE: 1123 case IF_SCSI: 1124 case IF_XEN: 1125 case IF_NONE: 1126 dinfo->media_cd = media == MEDIA_CDROM; 1127 break; 1128 default: 1129 break; 1130 } 1131 1132 fail: 1133 qemu_opts_del(legacy_opts); 1134 qobject_unref(bs_opts); 1135 return dinfo; 1136 } 1137 1138 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) 1139 { 1140 BlockDriverState *bs; 1141 1142 bs = bdrv_lookup_bs(name, name, errp); 1143 if (bs == NULL) { 1144 return NULL; 1145 } 1146 1147 if (!bdrv_is_root_node(bs)) { 1148 error_setg(errp, "Need a root block node"); 1149 return NULL; 1150 } 1151 1152 if (!bdrv_is_inserted(bs)) { 1153 error_setg(errp, "Device has no medium"); 1154 return NULL; 1155 } 1156 1157 return bs; 1158 } 1159 1160 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id, 1161 Error **errp) 1162 { 1163 BlockBackend *blk; 1164 1165 if (!blk_name == !qdev_id) { 1166 error_setg(errp, "Need exactly one of 'device' and 'id'"); 1167 return NULL; 1168 } 1169 1170 if (qdev_id) { 1171 blk = blk_by_qdev_id(qdev_id, errp); 1172 } else { 1173 blk = blk_by_name(blk_name); 1174 if (blk == NULL) { 1175 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1176 "Device '%s' not found", blk_name); 1177 } 1178 } 1179 1180 return blk; 1181 } 1182 1183 void hmp_commit(Monitor *mon, const QDict *qdict) 1184 { 1185 const char *device = qdict_get_str(qdict, "device"); 1186 BlockBackend *blk; 1187 int ret; 1188 1189 if (!strcmp(device, "all")) { 1190 ret = blk_commit_all(); 1191 } else { 1192 BlockDriverState *bs; 1193 AioContext *aio_context; 1194 1195 blk = blk_by_name(device); 1196 if (!blk) { 1197 monitor_printf(mon, "Device '%s' not found\n", device); 1198 return; 1199 } 1200 if (!blk_is_available(blk)) { 1201 monitor_printf(mon, "Device '%s' has no medium\n", device); 1202 return; 1203 } 1204 1205 bs = blk_bs(blk); 1206 aio_context = bdrv_get_aio_context(bs); 1207 aio_context_acquire(aio_context); 1208 1209 ret = bdrv_commit(bs); 1210 1211 aio_context_release(aio_context); 1212 } 1213 if (ret < 0) { 1214 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1215 strerror(-ret)); 1216 } 1217 } 1218 1219 static void blockdev_do_action(TransactionAction *action, Error **errp) 1220 { 1221 TransactionActionList list; 1222 1223 list.value = action; 1224 list.next = NULL; 1225 qmp_transaction(&list, false, NULL, errp); 1226 } 1227 1228 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1229 bool has_node_name, const char *node_name, 1230 const char *snapshot_file, 1231 bool has_snapshot_node_name, 1232 const char *snapshot_node_name, 1233 bool has_format, const char *format, 1234 bool has_mode, NewImageMode mode, Error **errp) 1235 { 1236 BlockdevSnapshotSync snapshot = { 1237 .has_device = has_device, 1238 .device = (char *) device, 1239 .has_node_name = has_node_name, 1240 .node_name = (char *) node_name, 1241 .snapshot_file = (char *) snapshot_file, 1242 .has_snapshot_node_name = has_snapshot_node_name, 1243 .snapshot_node_name = (char *) snapshot_node_name, 1244 .has_format = has_format, 1245 .format = (char *) format, 1246 .has_mode = has_mode, 1247 .mode = mode, 1248 }; 1249 TransactionAction action = { 1250 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1251 .u.blockdev_snapshot_sync.data = &snapshot, 1252 }; 1253 blockdev_do_action(&action, errp); 1254 } 1255 1256 void qmp_blockdev_snapshot(const char *node, const char *overlay, 1257 Error **errp) 1258 { 1259 BlockdevSnapshot snapshot_data = { 1260 .node = (char *) node, 1261 .overlay = (char *) overlay 1262 }; 1263 TransactionAction action = { 1264 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, 1265 .u.blockdev_snapshot.data = &snapshot_data, 1266 }; 1267 blockdev_do_action(&action, errp); 1268 } 1269 1270 void qmp_blockdev_snapshot_internal_sync(const char *device, 1271 const char *name, 1272 Error **errp) 1273 { 1274 BlockdevSnapshotInternal snapshot = { 1275 .device = (char *) device, 1276 .name = (char *) name 1277 }; 1278 TransactionAction action = { 1279 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1280 .u.blockdev_snapshot_internal_sync.data = &snapshot, 1281 }; 1282 blockdev_do_action(&action, errp); 1283 } 1284 1285 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1286 bool has_id, 1287 const char *id, 1288 bool has_name, 1289 const char *name, 1290 Error **errp) 1291 { 1292 BlockDriverState *bs; 1293 AioContext *aio_context; 1294 QEMUSnapshotInfo sn; 1295 Error *local_err = NULL; 1296 SnapshotInfo *info = NULL; 1297 int ret; 1298 1299 bs = qmp_get_root_bs(device, errp); 1300 if (!bs) { 1301 return NULL; 1302 } 1303 aio_context = bdrv_get_aio_context(bs); 1304 aio_context_acquire(aio_context); 1305 1306 if (!has_id) { 1307 id = NULL; 1308 } 1309 1310 if (!has_name) { 1311 name = NULL; 1312 } 1313 1314 if (!id && !name) { 1315 error_setg(errp, "Name or id must be provided"); 1316 goto out_aio_context; 1317 } 1318 1319 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1320 goto out_aio_context; 1321 } 1322 1323 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1324 if (local_err) { 1325 error_propagate(errp, local_err); 1326 goto out_aio_context; 1327 } 1328 if (!ret) { 1329 error_setg(errp, 1330 "Snapshot with id '%s' and name '%s' does not exist on " 1331 "device '%s'", 1332 STR_OR_NULL(id), STR_OR_NULL(name), device); 1333 goto out_aio_context; 1334 } 1335 1336 bdrv_snapshot_delete(bs, id, name, &local_err); 1337 if (local_err) { 1338 error_propagate(errp, local_err); 1339 goto out_aio_context; 1340 } 1341 1342 aio_context_release(aio_context); 1343 1344 info = g_new0(SnapshotInfo, 1); 1345 info->id = g_strdup(sn.id_str); 1346 info->name = g_strdup(sn.name); 1347 info->date_nsec = sn.date_nsec; 1348 info->date_sec = sn.date_sec; 1349 info->vm_state_size = sn.vm_state_size; 1350 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1351 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1352 1353 return info; 1354 1355 out_aio_context: 1356 aio_context_release(aio_context); 1357 return NULL; 1358 } 1359 1360 /** 1361 * block_dirty_bitmap_lookup: 1362 * Return a dirty bitmap (if present), after validating 1363 * the node reference and bitmap names. 1364 * 1365 * @node: The name of the BDS node to search for bitmaps 1366 * @name: The name of the bitmap to search for 1367 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1368 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1369 * @errp: Output pointer for error information. Can be NULL. 1370 * 1371 * @return: A bitmap object on success, or NULL on failure. 1372 */ 1373 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1374 const char *name, 1375 BlockDriverState **pbs, 1376 Error **errp) 1377 { 1378 BlockDriverState *bs; 1379 BdrvDirtyBitmap *bitmap; 1380 1381 if (!node) { 1382 error_setg(errp, "Node cannot be NULL"); 1383 return NULL; 1384 } 1385 if (!name) { 1386 error_setg(errp, "Bitmap name cannot be NULL"); 1387 return NULL; 1388 } 1389 bs = bdrv_lookup_bs(node, node, NULL); 1390 if (!bs) { 1391 error_setg(errp, "Node '%s' not found", node); 1392 return NULL; 1393 } 1394 1395 bitmap = bdrv_find_dirty_bitmap(bs, name); 1396 if (!bitmap) { 1397 error_setg(errp, "Dirty bitmap '%s' not found", name); 1398 return NULL; 1399 } 1400 1401 if (pbs) { 1402 *pbs = bs; 1403 } 1404 1405 return bitmap; 1406 } 1407 1408 /* New and old BlockDriverState structs for atomic group operations */ 1409 1410 typedef struct BlkActionState BlkActionState; 1411 1412 /** 1413 * BlkActionOps: 1414 * Table of operations that define an Action. 1415 * 1416 * @instance_size: Size of state struct, in bytes. 1417 * @prepare: Prepare the work, must NOT be NULL. 1418 * @commit: Commit the changes, can be NULL. 1419 * @abort: Abort the changes on fail, can be NULL. 1420 * @clean: Clean up resources after all transaction actions have called 1421 * commit() or abort(). Can be NULL. 1422 * 1423 * Only prepare() may fail. In a single transaction, only one of commit() or 1424 * abort() will be called. clean() will always be called if it is present. 1425 */ 1426 typedef struct BlkActionOps { 1427 size_t instance_size; 1428 void (*prepare)(BlkActionState *common, Error **errp); 1429 void (*commit)(BlkActionState *common); 1430 void (*abort)(BlkActionState *common); 1431 void (*clean)(BlkActionState *common); 1432 } BlkActionOps; 1433 1434 /** 1435 * BlkActionState: 1436 * Describes one Action's state within a Transaction. 1437 * 1438 * @action: QAPI-defined enum identifying which Action to perform. 1439 * @ops: Table of ActionOps this Action can perform. 1440 * @block_job_txn: Transaction which this action belongs to. 1441 * @entry: List membership for all Actions in this Transaction. 1442 * 1443 * This structure must be arranged as first member in a subclassed type, 1444 * assuming that the compiler will also arrange it to the same offsets as the 1445 * base class. 1446 */ 1447 struct BlkActionState { 1448 TransactionAction *action; 1449 const BlkActionOps *ops; 1450 JobTxn *block_job_txn; 1451 TransactionProperties *txn_props; 1452 QSIMPLEQ_ENTRY(BlkActionState) entry; 1453 }; 1454 1455 /* internal snapshot private data */ 1456 typedef struct InternalSnapshotState { 1457 BlkActionState common; 1458 BlockDriverState *bs; 1459 QEMUSnapshotInfo sn; 1460 bool created; 1461 } InternalSnapshotState; 1462 1463 1464 static int action_check_completion_mode(BlkActionState *s, Error **errp) 1465 { 1466 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 1467 error_setg(errp, 1468 "Action '%s' does not support Transaction property " 1469 "completion-mode = %s", 1470 TransactionActionKind_str(s->action->type), 1471 ActionCompletionMode_str(s->txn_props->completion_mode)); 1472 return -1; 1473 } 1474 return 0; 1475 } 1476 1477 static void internal_snapshot_prepare(BlkActionState *common, 1478 Error **errp) 1479 { 1480 Error *local_err = NULL; 1481 const char *device; 1482 const char *name; 1483 BlockDriverState *bs; 1484 QEMUSnapshotInfo old_sn, *sn; 1485 bool ret; 1486 qemu_timeval tv; 1487 BlockdevSnapshotInternal *internal; 1488 InternalSnapshotState *state; 1489 AioContext *aio_context; 1490 int ret1; 1491 1492 g_assert(common->action->type == 1493 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1494 internal = common->action->u.blockdev_snapshot_internal_sync.data; 1495 state = DO_UPCAST(InternalSnapshotState, common, common); 1496 1497 /* 1. parse input */ 1498 device = internal->device; 1499 name = internal->name; 1500 1501 /* 2. check for validation */ 1502 if (action_check_completion_mode(common, errp) < 0) { 1503 return; 1504 } 1505 1506 bs = qmp_get_root_bs(device, errp); 1507 if (!bs) { 1508 return; 1509 } 1510 1511 aio_context = bdrv_get_aio_context(bs); 1512 aio_context_acquire(aio_context); 1513 1514 state->bs = bs; 1515 1516 /* Paired with .clean() */ 1517 bdrv_drained_begin(bs); 1518 1519 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1520 goto out; 1521 } 1522 1523 if (bdrv_is_read_only(bs)) { 1524 error_setg(errp, "Device '%s' is read only", device); 1525 goto out; 1526 } 1527 1528 if (!bdrv_can_snapshot(bs)) { 1529 error_setg(errp, "Block format '%s' used by device '%s' " 1530 "does not support internal snapshots", 1531 bs->drv->format_name, device); 1532 goto out; 1533 } 1534 1535 if (!strlen(name)) { 1536 error_setg(errp, "Name is empty"); 1537 goto out; 1538 } 1539 1540 /* check whether a snapshot with name exist */ 1541 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1542 &local_err); 1543 if (local_err) { 1544 error_propagate(errp, local_err); 1545 goto out; 1546 } else if (ret) { 1547 error_setg(errp, 1548 "Snapshot with name '%s' already exists on device '%s'", 1549 name, device); 1550 goto out; 1551 } 1552 1553 /* 3. take the snapshot */ 1554 sn = &state->sn; 1555 pstrcpy(sn->name, sizeof(sn->name), name); 1556 qemu_gettimeofday(&tv); 1557 sn->date_sec = tv.tv_sec; 1558 sn->date_nsec = tv.tv_usec * 1000; 1559 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1560 1561 ret1 = bdrv_snapshot_create(bs, sn); 1562 if (ret1 < 0) { 1563 error_setg_errno(errp, -ret1, 1564 "Failed to create snapshot '%s' on device '%s'", 1565 name, device); 1566 goto out; 1567 } 1568 1569 /* 4. succeed, mark a snapshot is created */ 1570 state->created = true; 1571 1572 out: 1573 aio_context_release(aio_context); 1574 } 1575 1576 static void internal_snapshot_abort(BlkActionState *common) 1577 { 1578 InternalSnapshotState *state = 1579 DO_UPCAST(InternalSnapshotState, common, common); 1580 BlockDriverState *bs = state->bs; 1581 QEMUSnapshotInfo *sn = &state->sn; 1582 AioContext *aio_context; 1583 Error *local_error = NULL; 1584 1585 if (!state->created) { 1586 return; 1587 } 1588 1589 aio_context = bdrv_get_aio_context(state->bs); 1590 aio_context_acquire(aio_context); 1591 1592 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1593 error_reportf_err(local_error, 1594 "Failed to delete snapshot with id '%s' and " 1595 "name '%s' on device '%s' in abort: ", 1596 sn->id_str, sn->name, 1597 bdrv_get_device_name(bs)); 1598 } 1599 1600 aio_context_release(aio_context); 1601 } 1602 1603 static void internal_snapshot_clean(BlkActionState *common) 1604 { 1605 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1606 common, common); 1607 AioContext *aio_context; 1608 1609 if (!state->bs) { 1610 return; 1611 } 1612 1613 aio_context = bdrv_get_aio_context(state->bs); 1614 aio_context_acquire(aio_context); 1615 1616 bdrv_drained_end(state->bs); 1617 1618 aio_context_release(aio_context); 1619 } 1620 1621 /* external snapshot private data */ 1622 typedef struct ExternalSnapshotState { 1623 BlkActionState common; 1624 BlockDriverState *old_bs; 1625 BlockDriverState *new_bs; 1626 bool overlay_appended; 1627 } ExternalSnapshotState; 1628 1629 static void external_snapshot_prepare(BlkActionState *common, 1630 Error **errp) 1631 { 1632 int flags = 0; 1633 QDict *options = NULL; 1634 Error *local_err = NULL; 1635 /* Device and node name of the image to generate the snapshot from */ 1636 const char *device; 1637 const char *node_name; 1638 /* Reference to the new image (for 'blockdev-snapshot') */ 1639 const char *snapshot_ref; 1640 /* File name of the new image (for 'blockdev-snapshot-sync') */ 1641 const char *new_image_file; 1642 ExternalSnapshotState *state = 1643 DO_UPCAST(ExternalSnapshotState, common, common); 1644 TransactionAction *action = common->action; 1645 AioContext *aio_context; 1646 1647 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar 1648 * purpose but a different set of parameters */ 1649 switch (action->type) { 1650 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: 1651 { 1652 BlockdevSnapshot *s = action->u.blockdev_snapshot.data; 1653 device = s->node; 1654 node_name = s->node; 1655 new_image_file = NULL; 1656 snapshot_ref = s->overlay; 1657 } 1658 break; 1659 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 1660 { 1661 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1662 device = s->has_device ? s->device : NULL; 1663 node_name = s->has_node_name ? s->node_name : NULL; 1664 new_image_file = s->snapshot_file; 1665 snapshot_ref = NULL; 1666 } 1667 break; 1668 default: 1669 g_assert_not_reached(); 1670 } 1671 1672 /* start processing */ 1673 if (action_check_completion_mode(common, errp) < 0) { 1674 return; 1675 } 1676 1677 state->old_bs = bdrv_lookup_bs(device, node_name, errp); 1678 if (!state->old_bs) { 1679 return; 1680 } 1681 1682 aio_context = bdrv_get_aio_context(state->old_bs); 1683 aio_context_acquire(aio_context); 1684 1685 /* Paired with .clean() */ 1686 bdrv_drained_begin(state->old_bs); 1687 1688 if (!bdrv_is_inserted(state->old_bs)) { 1689 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1690 goto out; 1691 } 1692 1693 if (bdrv_op_is_blocked(state->old_bs, 1694 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1695 goto out; 1696 } 1697 1698 if (!bdrv_is_read_only(state->old_bs)) { 1699 if (bdrv_flush(state->old_bs)) { 1700 error_setg(errp, QERR_IO_ERROR); 1701 goto out; 1702 } 1703 } 1704 1705 if (!bdrv_is_first_non_filter(state->old_bs)) { 1706 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1707 goto out; 1708 } 1709 1710 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { 1711 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; 1712 const char *format = s->has_format ? s->format : "qcow2"; 1713 enum NewImageMode mode; 1714 const char *snapshot_node_name = 1715 s->has_snapshot_node_name ? s->snapshot_node_name : NULL; 1716 1717 if (node_name && !snapshot_node_name) { 1718 error_setg(errp, "New snapshot node name missing"); 1719 goto out; 1720 } 1721 1722 if (snapshot_node_name && 1723 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { 1724 error_setg(errp, "New snapshot node name already in use"); 1725 goto out; 1726 } 1727 1728 flags = state->old_bs->open_flags; 1729 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); 1730 flags |= BDRV_O_NO_BACKING; 1731 1732 /* create new image w/backing file */ 1733 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1734 if (mode != NEW_IMAGE_MODE_EXISTING) { 1735 int64_t size = bdrv_getlength(state->old_bs); 1736 if (size < 0) { 1737 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1738 goto out; 1739 } 1740 bdrv_img_create(new_image_file, format, 1741 state->old_bs->filename, 1742 state->old_bs->drv->format_name, 1743 NULL, size, flags, false, &local_err); 1744 if (local_err) { 1745 error_propagate(errp, local_err); 1746 goto out; 1747 } 1748 } 1749 1750 options = qdict_new(); 1751 if (s->has_snapshot_node_name) { 1752 qdict_put_str(options, "node-name", snapshot_node_name); 1753 } 1754 qdict_put_str(options, "driver", format); 1755 } 1756 1757 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, 1758 errp); 1759 /* We will manually add the backing_hd field to the bs later */ 1760 if (!state->new_bs) { 1761 goto out; 1762 } 1763 1764 if (bdrv_has_blk(state->new_bs)) { 1765 error_setg(errp, "The snapshot is already in use"); 1766 goto out; 1767 } 1768 1769 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 1770 errp)) { 1771 goto out; 1772 } 1773 1774 if (state->new_bs->backing != NULL) { 1775 error_setg(errp, "The snapshot already has a backing image"); 1776 goto out; 1777 } 1778 1779 if (!state->new_bs->drv->supports_backing) { 1780 error_setg(errp, "The snapshot does not support backing images"); 1781 goto out; 1782 } 1783 1784 bdrv_set_aio_context(state->new_bs, aio_context); 1785 1786 /* This removes our old bs and adds the new bs. This is an operation that 1787 * can fail, so we need to do it in .prepare; undoing it for abort is 1788 * always possible. */ 1789 bdrv_ref(state->new_bs); 1790 bdrv_append(state->new_bs, state->old_bs, &local_err); 1791 if (local_err) { 1792 error_propagate(errp, local_err); 1793 goto out; 1794 } 1795 state->overlay_appended = true; 1796 1797 out: 1798 aio_context_release(aio_context); 1799 } 1800 1801 static void external_snapshot_commit(BlkActionState *common) 1802 { 1803 ExternalSnapshotState *state = 1804 DO_UPCAST(ExternalSnapshotState, common, common); 1805 AioContext *aio_context; 1806 1807 aio_context = bdrv_get_aio_context(state->old_bs); 1808 aio_context_acquire(aio_context); 1809 1810 /* We don't need (or want) to use the transactional 1811 * bdrv_reopen_multiple() across all the entries at once, because we 1812 * don't want to abort all of them if one of them fails the reopen */ 1813 if (!atomic_read(&state->old_bs->copy_on_read)) { 1814 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR, 1815 NULL); 1816 } 1817 1818 aio_context_release(aio_context); 1819 } 1820 1821 static void external_snapshot_abort(BlkActionState *common) 1822 { 1823 ExternalSnapshotState *state = 1824 DO_UPCAST(ExternalSnapshotState, common, common); 1825 if (state->new_bs) { 1826 if (state->overlay_appended) { 1827 AioContext *aio_context; 1828 1829 aio_context = bdrv_get_aio_context(state->old_bs); 1830 aio_context_acquire(aio_context); 1831 1832 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() 1833 close state->old_bs; we need it */ 1834 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); 1835 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); 1836 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ 1837 1838 aio_context_release(aio_context); 1839 } 1840 } 1841 } 1842 1843 static void external_snapshot_clean(BlkActionState *common) 1844 { 1845 ExternalSnapshotState *state = 1846 DO_UPCAST(ExternalSnapshotState, common, common); 1847 AioContext *aio_context; 1848 1849 if (!state->old_bs) { 1850 return; 1851 } 1852 1853 aio_context = bdrv_get_aio_context(state->old_bs); 1854 aio_context_acquire(aio_context); 1855 1856 bdrv_drained_end(state->old_bs); 1857 bdrv_unref(state->new_bs); 1858 1859 aio_context_release(aio_context); 1860 } 1861 1862 typedef struct DriveBackupState { 1863 BlkActionState common; 1864 BlockDriverState *bs; 1865 BlockJob *job; 1866 } DriveBackupState; 1867 1868 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 1869 Error **errp); 1870 1871 static void drive_backup_prepare(BlkActionState *common, Error **errp) 1872 { 1873 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1874 BlockDriverState *bs; 1875 DriveBackup *backup; 1876 AioContext *aio_context; 1877 Error *local_err = NULL; 1878 1879 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1880 backup = common->action->u.drive_backup.data; 1881 1882 bs = qmp_get_root_bs(backup->device, errp); 1883 if (!bs) { 1884 return; 1885 } 1886 1887 aio_context = bdrv_get_aio_context(bs); 1888 aio_context_acquire(aio_context); 1889 1890 /* Paired with .clean() */ 1891 bdrv_drained_begin(bs); 1892 1893 state->bs = bs; 1894 1895 state->job = do_drive_backup(backup, common->block_job_txn, &local_err); 1896 if (local_err) { 1897 error_propagate(errp, local_err); 1898 goto out; 1899 } 1900 1901 out: 1902 aio_context_release(aio_context); 1903 } 1904 1905 static void drive_backup_commit(BlkActionState *common) 1906 { 1907 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1908 AioContext *aio_context; 1909 1910 aio_context = bdrv_get_aio_context(state->bs); 1911 aio_context_acquire(aio_context); 1912 1913 assert(state->job); 1914 job_start(&state->job->job); 1915 1916 aio_context_release(aio_context); 1917 } 1918 1919 static void drive_backup_abort(BlkActionState *common) 1920 { 1921 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1922 1923 if (state->job) { 1924 AioContext *aio_context; 1925 1926 aio_context = bdrv_get_aio_context(state->bs); 1927 aio_context_acquire(aio_context); 1928 1929 job_cancel_sync(&state->job->job); 1930 1931 aio_context_release(aio_context); 1932 } 1933 } 1934 1935 static void drive_backup_clean(BlkActionState *common) 1936 { 1937 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1938 AioContext *aio_context; 1939 1940 if (!state->bs) { 1941 return; 1942 } 1943 1944 aio_context = bdrv_get_aio_context(state->bs); 1945 aio_context_acquire(aio_context); 1946 1947 bdrv_drained_end(state->bs); 1948 1949 aio_context_release(aio_context); 1950 } 1951 1952 typedef struct BlockdevBackupState { 1953 BlkActionState common; 1954 BlockDriverState *bs; 1955 BlockJob *job; 1956 } BlockdevBackupState; 1957 1958 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 1959 Error **errp); 1960 1961 static void blockdev_backup_prepare(BlkActionState *common, Error **errp) 1962 { 1963 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1964 BlockdevBackup *backup; 1965 BlockDriverState *bs, *target; 1966 AioContext *aio_context; 1967 Error *local_err = NULL; 1968 1969 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1970 backup = common->action->u.blockdev_backup.data; 1971 1972 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 1973 if (!bs) { 1974 return; 1975 } 1976 1977 target = bdrv_lookup_bs(backup->target, backup->target, errp); 1978 if (!target) { 1979 return; 1980 } 1981 1982 aio_context = bdrv_get_aio_context(bs); 1983 if (aio_context != bdrv_get_aio_context(target)) { 1984 error_setg(errp, "Backup between two IO threads is not implemented"); 1985 return; 1986 } 1987 aio_context_acquire(aio_context); 1988 state->bs = bs; 1989 1990 /* Paired with .clean() */ 1991 bdrv_drained_begin(state->bs); 1992 1993 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err); 1994 if (local_err) { 1995 error_propagate(errp, local_err); 1996 goto out; 1997 } 1998 1999 out: 2000 aio_context_release(aio_context); 2001 } 2002 2003 static void blockdev_backup_commit(BlkActionState *common) 2004 { 2005 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 2006 AioContext *aio_context; 2007 2008 aio_context = bdrv_get_aio_context(state->bs); 2009 aio_context_acquire(aio_context); 2010 2011 assert(state->job); 2012 job_start(&state->job->job); 2013 2014 aio_context_release(aio_context); 2015 } 2016 2017 static void blockdev_backup_abort(BlkActionState *common) 2018 { 2019 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 2020 2021 if (state->job) { 2022 AioContext *aio_context; 2023 2024 aio_context = bdrv_get_aio_context(state->bs); 2025 aio_context_acquire(aio_context); 2026 2027 job_cancel_sync(&state->job->job); 2028 2029 aio_context_release(aio_context); 2030 } 2031 } 2032 2033 static void blockdev_backup_clean(BlkActionState *common) 2034 { 2035 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 2036 AioContext *aio_context; 2037 2038 if (!state->bs) { 2039 return; 2040 } 2041 2042 aio_context = bdrv_get_aio_context(state->bs); 2043 aio_context_acquire(aio_context); 2044 2045 bdrv_drained_end(state->bs); 2046 2047 aio_context_release(aio_context); 2048 } 2049 2050 typedef struct BlockDirtyBitmapState { 2051 BlkActionState common; 2052 BdrvDirtyBitmap *bitmap; 2053 BlockDriverState *bs; 2054 HBitmap *backup; 2055 bool prepared; 2056 bool was_enabled; 2057 } BlockDirtyBitmapState; 2058 2059 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 2060 Error **errp) 2061 { 2062 Error *local_err = NULL; 2063 BlockDirtyBitmapAdd *action; 2064 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2065 common, common); 2066 2067 if (action_check_completion_mode(common, errp) < 0) { 2068 return; 2069 } 2070 2071 action = common->action->u.block_dirty_bitmap_add.data; 2072 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 2073 qmp_block_dirty_bitmap_add(action->node, action->name, 2074 action->has_granularity, action->granularity, 2075 action->has_persistent, action->persistent, 2076 action->has_autoload, action->autoload, 2077 action->has_x_disabled, action->x_disabled, 2078 &local_err); 2079 2080 if (!local_err) { 2081 state->prepared = true; 2082 } else { 2083 error_propagate(errp, local_err); 2084 } 2085 } 2086 2087 static void block_dirty_bitmap_add_abort(BlkActionState *common) 2088 { 2089 BlockDirtyBitmapAdd *action; 2090 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2091 common, common); 2092 2093 action = common->action->u.block_dirty_bitmap_add.data; 2094 /* Should not be able to fail: IF the bitmap was added via .prepare(), 2095 * then the node reference and bitmap name must have been valid. 2096 */ 2097 if (state->prepared) { 2098 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 2099 } 2100 } 2101 2102 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 2103 Error **errp) 2104 { 2105 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2106 common, common); 2107 BlockDirtyBitmap *action; 2108 2109 if (action_check_completion_mode(common, errp) < 0) { 2110 return; 2111 } 2112 2113 action = common->action->u.block_dirty_bitmap_clear.data; 2114 state->bitmap = block_dirty_bitmap_lookup(action->node, 2115 action->name, 2116 &state->bs, 2117 errp); 2118 if (!state->bitmap) { 2119 return; 2120 } 2121 2122 if (bdrv_dirty_bitmap_frozen(state->bitmap)) { 2123 error_setg(errp, "Cannot modify a frozen bitmap"); 2124 return; 2125 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) { 2126 error_setg(errp, "Cannot modify a locked bitmap"); 2127 return; 2128 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) { 2129 error_setg(errp, "Cannot clear a disabled bitmap"); 2130 return; 2131 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) { 2132 error_setg(errp, "Cannot clear a readonly bitmap"); 2133 return; 2134 } 2135 2136 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2137 } 2138 2139 static void block_dirty_bitmap_clear_abort(BlkActionState *common) 2140 { 2141 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2142 common, common); 2143 2144 if (state->backup) { 2145 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup); 2146 } 2147 } 2148 2149 static void block_dirty_bitmap_clear_commit(BlkActionState *common) 2150 { 2151 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2152 common, common); 2153 2154 hbitmap_free(state->backup); 2155 } 2156 2157 static void block_dirty_bitmap_enable_prepare(BlkActionState *common, 2158 Error **errp) 2159 { 2160 BlockDirtyBitmap *action; 2161 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2162 common, common); 2163 2164 if (action_check_completion_mode(common, errp) < 0) { 2165 return; 2166 } 2167 2168 action = common->action->u.x_block_dirty_bitmap_enable.data; 2169 state->bitmap = block_dirty_bitmap_lookup(action->node, 2170 action->name, 2171 NULL, 2172 errp); 2173 if (!state->bitmap) { 2174 return; 2175 } 2176 2177 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2178 bdrv_enable_dirty_bitmap(state->bitmap); 2179 } 2180 2181 static void block_dirty_bitmap_enable_abort(BlkActionState *common) 2182 { 2183 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2184 common, common); 2185 2186 if (!state->was_enabled) { 2187 bdrv_disable_dirty_bitmap(state->bitmap); 2188 } 2189 } 2190 2191 static void block_dirty_bitmap_disable_prepare(BlkActionState *common, 2192 Error **errp) 2193 { 2194 BlockDirtyBitmap *action; 2195 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2196 common, common); 2197 2198 if (action_check_completion_mode(common, errp) < 0) { 2199 return; 2200 } 2201 2202 action = common->action->u.x_block_dirty_bitmap_disable.data; 2203 state->bitmap = block_dirty_bitmap_lookup(action->node, 2204 action->name, 2205 NULL, 2206 errp); 2207 if (!state->bitmap) { 2208 return; 2209 } 2210 2211 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); 2212 bdrv_disable_dirty_bitmap(state->bitmap); 2213 } 2214 2215 static void block_dirty_bitmap_disable_abort(BlkActionState *common) 2216 { 2217 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2218 common, common); 2219 2220 if (state->was_enabled) { 2221 bdrv_enable_dirty_bitmap(state->bitmap); 2222 } 2223 } 2224 2225 static void abort_prepare(BlkActionState *common, Error **errp) 2226 { 2227 error_setg(errp, "Transaction aborted using Abort action"); 2228 } 2229 2230 static void abort_commit(BlkActionState *common) 2231 { 2232 g_assert_not_reached(); /* this action never succeeds */ 2233 } 2234 2235 static const BlkActionOps actions[] = { 2236 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2237 .instance_size = sizeof(ExternalSnapshotState), 2238 .prepare = external_snapshot_prepare, 2239 .commit = external_snapshot_commit, 2240 .abort = external_snapshot_abort, 2241 .clean = external_snapshot_clean, 2242 }, 2243 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2244 .instance_size = sizeof(ExternalSnapshotState), 2245 .prepare = external_snapshot_prepare, 2246 .commit = external_snapshot_commit, 2247 .abort = external_snapshot_abort, 2248 .clean = external_snapshot_clean, 2249 }, 2250 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2251 .instance_size = sizeof(DriveBackupState), 2252 .prepare = drive_backup_prepare, 2253 .commit = drive_backup_commit, 2254 .abort = drive_backup_abort, 2255 .clean = drive_backup_clean, 2256 }, 2257 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2258 .instance_size = sizeof(BlockdevBackupState), 2259 .prepare = blockdev_backup_prepare, 2260 .commit = blockdev_backup_commit, 2261 .abort = blockdev_backup_abort, 2262 .clean = blockdev_backup_clean, 2263 }, 2264 [TRANSACTION_ACTION_KIND_ABORT] = { 2265 .instance_size = sizeof(BlkActionState), 2266 .prepare = abort_prepare, 2267 .commit = abort_commit, 2268 }, 2269 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2270 .instance_size = sizeof(InternalSnapshotState), 2271 .prepare = internal_snapshot_prepare, 2272 .abort = internal_snapshot_abort, 2273 .clean = internal_snapshot_clean, 2274 }, 2275 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2276 .instance_size = sizeof(BlockDirtyBitmapState), 2277 .prepare = block_dirty_bitmap_add_prepare, 2278 .abort = block_dirty_bitmap_add_abort, 2279 }, 2280 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2281 .instance_size = sizeof(BlockDirtyBitmapState), 2282 .prepare = block_dirty_bitmap_clear_prepare, 2283 .commit = block_dirty_bitmap_clear_commit, 2284 .abort = block_dirty_bitmap_clear_abort, 2285 }, 2286 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = { 2287 .instance_size = sizeof(BlockDirtyBitmapState), 2288 .prepare = block_dirty_bitmap_enable_prepare, 2289 .abort = block_dirty_bitmap_enable_abort, 2290 }, 2291 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = { 2292 .instance_size = sizeof(BlockDirtyBitmapState), 2293 .prepare = block_dirty_bitmap_disable_prepare, 2294 .abort = block_dirty_bitmap_disable_abort, 2295 } 2296 }; 2297 2298 /** 2299 * Allocate a TransactionProperties structure if necessary, and fill 2300 * that structure with desired defaults if they are unset. 2301 */ 2302 static TransactionProperties *get_transaction_properties( 2303 TransactionProperties *props) 2304 { 2305 if (!props) { 2306 props = g_new0(TransactionProperties, 1); 2307 } 2308 2309 if (!props->has_completion_mode) { 2310 props->has_completion_mode = true; 2311 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2312 } 2313 2314 return props; 2315 } 2316 2317 /* 2318 * 'Atomic' group operations. The operations are performed as a set, and if 2319 * any fail then we roll back all operations in the group. 2320 */ 2321 void qmp_transaction(TransactionActionList *dev_list, 2322 bool has_props, 2323 struct TransactionProperties *props, 2324 Error **errp) 2325 { 2326 TransactionActionList *dev_entry = dev_list; 2327 JobTxn *block_job_txn = NULL; 2328 BlkActionState *state, *next; 2329 Error *local_err = NULL; 2330 2331 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; 2332 QSIMPLEQ_INIT(&snap_bdrv_states); 2333 2334 /* Does this transaction get canceled as a group on failure? 2335 * If not, we don't really need to make a JobTxn. 2336 */ 2337 props = get_transaction_properties(props); 2338 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2339 block_job_txn = job_txn_new(); 2340 } 2341 2342 /* drain all i/o before any operations */ 2343 bdrv_drain_all(); 2344 2345 /* We don't do anything in this loop that commits us to the operations */ 2346 while (NULL != dev_entry) { 2347 TransactionAction *dev_info = NULL; 2348 const BlkActionOps *ops; 2349 2350 dev_info = dev_entry->value; 2351 dev_entry = dev_entry->next; 2352 2353 assert(dev_info->type < ARRAY_SIZE(actions)); 2354 2355 ops = &actions[dev_info->type]; 2356 assert(ops->instance_size > 0); 2357 2358 state = g_malloc0(ops->instance_size); 2359 state->ops = ops; 2360 state->action = dev_info; 2361 state->block_job_txn = block_job_txn; 2362 state->txn_props = props; 2363 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2364 2365 state->ops->prepare(state, &local_err); 2366 if (local_err) { 2367 error_propagate(errp, local_err); 2368 goto delete_and_fail; 2369 } 2370 } 2371 2372 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2373 if (state->ops->commit) { 2374 state->ops->commit(state); 2375 } 2376 } 2377 2378 /* success */ 2379 goto exit; 2380 2381 delete_and_fail: 2382 /* failure, and it is all-or-none; roll back all operations */ 2383 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2384 if (state->ops->abort) { 2385 state->ops->abort(state); 2386 } 2387 } 2388 exit: 2389 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2390 if (state->ops->clean) { 2391 state->ops->clean(state); 2392 } 2393 g_free(state); 2394 } 2395 if (!has_props) { 2396 qapi_free_TransactionProperties(props); 2397 } 2398 job_txn_unref(block_job_txn); 2399 } 2400 2401 void qmp_eject(bool has_device, const char *device, 2402 bool has_id, const char *id, 2403 bool has_force, bool force, Error **errp) 2404 { 2405 Error *local_err = NULL; 2406 int rc; 2407 2408 if (!has_force) { 2409 force = false; 2410 } 2411 2412 rc = do_open_tray(has_device ? device : NULL, 2413 has_id ? id : NULL, 2414 force, &local_err); 2415 if (rc && rc != -ENOSYS) { 2416 error_propagate(errp, local_err); 2417 return; 2418 } 2419 error_free(local_err); 2420 2421 blockdev_remove_medium(has_device, device, has_id, id, errp); 2422 } 2423 2424 void qmp_block_passwd(bool has_device, const char *device, 2425 bool has_node_name, const char *node_name, 2426 const char *password, Error **errp) 2427 { 2428 error_setg(errp, 2429 "Setting block passwords directly is no longer supported"); 2430 } 2431 2432 /* 2433 * Attempt to open the tray of @device. 2434 * If @force, ignore its tray lock. 2435 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2436 * On error, store an error through @errp and return -errno. 2437 * If @device does not exist, return -ENODEV. 2438 * If it has no removable media, return -ENOTSUP. 2439 * If it has no tray, return -ENOSYS. 2440 * If the guest was asked to open the tray, return -EINPROGRESS. 2441 * Else, return 0. 2442 */ 2443 static int do_open_tray(const char *blk_name, const char *qdev_id, 2444 bool force, Error **errp) 2445 { 2446 BlockBackend *blk; 2447 const char *device = qdev_id ?: blk_name; 2448 bool locked; 2449 2450 blk = qmp_get_blk(blk_name, qdev_id, errp); 2451 if (!blk) { 2452 return -ENODEV; 2453 } 2454 2455 if (!blk_dev_has_removable_media(blk)) { 2456 error_setg(errp, "Device '%s' is not removable", device); 2457 return -ENOTSUP; 2458 } 2459 2460 if (!blk_dev_has_tray(blk)) { 2461 error_setg(errp, "Device '%s' does not have a tray", device); 2462 return -ENOSYS; 2463 } 2464 2465 if (blk_dev_is_tray_open(blk)) { 2466 return 0; 2467 } 2468 2469 locked = blk_dev_is_medium_locked(blk); 2470 if (locked) { 2471 blk_dev_eject_request(blk, force); 2472 } 2473 2474 if (!locked || force) { 2475 blk_dev_change_media_cb(blk, false, &error_abort); 2476 } 2477 2478 if (locked && !force) { 2479 error_setg(errp, "Device '%s' is locked and force was not specified, " 2480 "wait for tray to open and try again", device); 2481 return -EINPROGRESS; 2482 } 2483 2484 return 0; 2485 } 2486 2487 void qmp_blockdev_open_tray(bool has_device, const char *device, 2488 bool has_id, const char *id, 2489 bool has_force, bool force, 2490 Error **errp) 2491 { 2492 Error *local_err = NULL; 2493 int rc; 2494 2495 if (!has_force) { 2496 force = false; 2497 } 2498 rc = do_open_tray(has_device ? device : NULL, 2499 has_id ? id : NULL, 2500 force, &local_err); 2501 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2502 error_propagate(errp, local_err); 2503 return; 2504 } 2505 error_free(local_err); 2506 } 2507 2508 void qmp_blockdev_close_tray(bool has_device, const char *device, 2509 bool has_id, const char *id, 2510 Error **errp) 2511 { 2512 BlockBackend *blk; 2513 Error *local_err = NULL; 2514 2515 device = has_device ? device : NULL; 2516 id = has_id ? id : NULL; 2517 2518 blk = qmp_get_blk(device, id, errp); 2519 if (!blk) { 2520 return; 2521 } 2522 2523 if (!blk_dev_has_removable_media(blk)) { 2524 error_setg(errp, "Device '%s' is not removable", device ?: id); 2525 return; 2526 } 2527 2528 if (!blk_dev_has_tray(blk)) { 2529 /* Ignore this command on tray-less devices */ 2530 return; 2531 } 2532 2533 if (!blk_dev_is_tray_open(blk)) { 2534 return; 2535 } 2536 2537 blk_dev_change_media_cb(blk, true, &local_err); 2538 if (local_err) { 2539 error_propagate(errp, local_err); 2540 return; 2541 } 2542 } 2543 2544 static void blockdev_remove_medium(bool has_device, const char *device, 2545 bool has_id, const char *id, Error **errp) 2546 { 2547 BlockBackend *blk; 2548 BlockDriverState *bs; 2549 AioContext *aio_context; 2550 bool has_attached_device; 2551 2552 device = has_device ? device : NULL; 2553 id = has_id ? id : NULL; 2554 2555 blk = qmp_get_blk(device, id, errp); 2556 if (!blk) { 2557 return; 2558 } 2559 2560 /* For BBs without a device, we can exchange the BDS tree at will */ 2561 has_attached_device = blk_get_attached_dev(blk); 2562 2563 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2564 error_setg(errp, "Device '%s' is not removable", device ?: id); 2565 return; 2566 } 2567 2568 if (has_attached_device && blk_dev_has_tray(blk) && 2569 !blk_dev_is_tray_open(blk)) 2570 { 2571 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2572 return; 2573 } 2574 2575 bs = blk_bs(blk); 2576 if (!bs) { 2577 return; 2578 } 2579 2580 aio_context = bdrv_get_aio_context(bs); 2581 aio_context_acquire(aio_context); 2582 2583 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2584 goto out; 2585 } 2586 2587 blk_remove_bs(blk); 2588 2589 if (!blk_dev_has_tray(blk)) { 2590 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2591 * called at all); therefore, the medium needs to be ejected here. 2592 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2593 * value passed here (i.e. false). */ 2594 blk_dev_change_media_cb(blk, false, &error_abort); 2595 } 2596 2597 out: 2598 aio_context_release(aio_context); 2599 } 2600 2601 void qmp_blockdev_remove_medium(const char *id, Error **errp) 2602 { 2603 blockdev_remove_medium(false, NULL, true, id, errp); 2604 } 2605 2606 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2607 BlockDriverState *bs, Error **errp) 2608 { 2609 Error *local_err = NULL; 2610 bool has_device; 2611 int ret; 2612 2613 /* For BBs without a device, we can exchange the BDS tree at will */ 2614 has_device = blk_get_attached_dev(blk); 2615 2616 if (has_device && !blk_dev_has_removable_media(blk)) { 2617 error_setg(errp, "Device is not removable"); 2618 return; 2619 } 2620 2621 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2622 error_setg(errp, "Tray of the device is not open"); 2623 return; 2624 } 2625 2626 if (blk_bs(blk)) { 2627 error_setg(errp, "There already is a medium in the device"); 2628 return; 2629 } 2630 2631 ret = blk_insert_bs(blk, bs, errp); 2632 if (ret < 0) { 2633 return; 2634 } 2635 2636 if (!blk_dev_has_tray(blk)) { 2637 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2638 * called at all); therefore, the medium needs to be pushed into the 2639 * slot here. 2640 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2641 * value passed here (i.e. true). */ 2642 blk_dev_change_media_cb(blk, true, &local_err); 2643 if (local_err) { 2644 error_propagate(errp, local_err); 2645 blk_remove_bs(blk); 2646 return; 2647 } 2648 } 2649 } 2650 2651 static void blockdev_insert_medium(bool has_device, const char *device, 2652 bool has_id, const char *id, 2653 const char *node_name, Error **errp) 2654 { 2655 BlockBackend *blk; 2656 BlockDriverState *bs; 2657 2658 blk = qmp_get_blk(has_device ? device : NULL, 2659 has_id ? id : NULL, 2660 errp); 2661 if (!blk) { 2662 return; 2663 } 2664 2665 bs = bdrv_find_node(node_name); 2666 if (!bs) { 2667 error_setg(errp, "Node '%s' not found", node_name); 2668 return; 2669 } 2670 2671 if (bdrv_has_blk(bs)) { 2672 error_setg(errp, "Node '%s' is already in use", node_name); 2673 return; 2674 } 2675 2676 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2677 } 2678 2679 void qmp_blockdev_insert_medium(const char *id, const char *node_name, 2680 Error **errp) 2681 { 2682 blockdev_insert_medium(false, NULL, true, id, node_name, errp); 2683 } 2684 2685 void qmp_blockdev_change_medium(bool has_device, const char *device, 2686 bool has_id, const char *id, 2687 const char *filename, 2688 bool has_format, const char *format, 2689 bool has_read_only, 2690 BlockdevChangeReadOnlyMode read_only, 2691 Error **errp) 2692 { 2693 BlockBackend *blk; 2694 BlockDriverState *medium_bs = NULL; 2695 int bdrv_flags; 2696 bool detect_zeroes; 2697 int rc; 2698 QDict *options = NULL; 2699 Error *err = NULL; 2700 2701 blk = qmp_get_blk(has_device ? device : NULL, 2702 has_id ? id : NULL, 2703 errp); 2704 if (!blk) { 2705 goto fail; 2706 } 2707 2708 if (blk_bs(blk)) { 2709 blk_update_root_state(blk); 2710 } 2711 2712 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2713 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2714 BDRV_O_PROTOCOL); 2715 2716 if (!has_read_only) { 2717 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2718 } 2719 2720 switch (read_only) { 2721 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2722 break; 2723 2724 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2725 bdrv_flags &= ~BDRV_O_RDWR; 2726 break; 2727 2728 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2729 bdrv_flags |= BDRV_O_RDWR; 2730 break; 2731 2732 default: 2733 abort(); 2734 } 2735 2736 options = qdict_new(); 2737 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2738 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2739 2740 if (has_format) { 2741 qdict_put_str(options, "driver", format); 2742 } 2743 2744 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2745 if (!medium_bs) { 2746 goto fail; 2747 } 2748 2749 rc = do_open_tray(has_device ? device : NULL, 2750 has_id ? id : NULL, 2751 false, &err); 2752 if (rc && rc != -ENOSYS) { 2753 error_propagate(errp, err); 2754 goto fail; 2755 } 2756 error_free(err); 2757 err = NULL; 2758 2759 blockdev_remove_medium(has_device, device, has_id, id, &err); 2760 if (err) { 2761 error_propagate(errp, err); 2762 goto fail; 2763 } 2764 2765 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2766 if (err) { 2767 error_propagate(errp, err); 2768 goto fail; 2769 } 2770 2771 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2772 2773 fail: 2774 /* If the medium has been inserted, the device has its own reference, so 2775 * ours must be relinquished; and if it has not been inserted successfully, 2776 * the reference must be relinquished anyway */ 2777 bdrv_unref(medium_bs); 2778 } 2779 2780 /* throttling disk I/O limits */ 2781 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2782 { 2783 ThrottleConfig cfg; 2784 BlockDriverState *bs; 2785 BlockBackend *blk; 2786 AioContext *aio_context; 2787 2788 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2789 arg->has_id ? arg->id : NULL, 2790 errp); 2791 if (!blk) { 2792 return; 2793 } 2794 2795 aio_context = blk_get_aio_context(blk); 2796 aio_context_acquire(aio_context); 2797 2798 bs = blk_bs(blk); 2799 if (!bs) { 2800 error_setg(errp, "Device has no medium"); 2801 goto out; 2802 } 2803 2804 throttle_config_init(&cfg); 2805 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2806 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2807 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2808 2809 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2810 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2811 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2812 2813 if (arg->has_bps_max) { 2814 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2815 } 2816 if (arg->has_bps_rd_max) { 2817 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2818 } 2819 if (arg->has_bps_wr_max) { 2820 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2821 } 2822 if (arg->has_iops_max) { 2823 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2824 } 2825 if (arg->has_iops_rd_max) { 2826 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2827 } 2828 if (arg->has_iops_wr_max) { 2829 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2830 } 2831 2832 if (arg->has_bps_max_length) { 2833 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2834 } 2835 if (arg->has_bps_rd_max_length) { 2836 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2837 } 2838 if (arg->has_bps_wr_max_length) { 2839 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2840 } 2841 if (arg->has_iops_max_length) { 2842 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2843 } 2844 if (arg->has_iops_rd_max_length) { 2845 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2846 } 2847 if (arg->has_iops_wr_max_length) { 2848 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2849 } 2850 2851 if (arg->has_iops_size) { 2852 cfg.op_size = arg->iops_size; 2853 } 2854 2855 if (!throttle_is_valid(&cfg, errp)) { 2856 goto out; 2857 } 2858 2859 if (throttle_enabled(&cfg)) { 2860 /* Enable I/O limits if they're not enabled yet, otherwise 2861 * just update the throttling group. */ 2862 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2863 blk_io_limits_enable(blk, 2864 arg->has_group ? arg->group : 2865 arg->has_device ? arg->device : 2866 arg->id); 2867 } else if (arg->has_group) { 2868 blk_io_limits_update_group(blk, arg->group); 2869 } 2870 /* Set the new throttling configuration */ 2871 blk_set_io_limits(blk, &cfg); 2872 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2873 /* If all throttling settings are set to 0, disable I/O limits */ 2874 blk_io_limits_disable(blk); 2875 } 2876 2877 out: 2878 aio_context_release(aio_context); 2879 } 2880 2881 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2882 bool has_granularity, uint32_t granularity, 2883 bool has_persistent, bool persistent, 2884 bool has_autoload, bool autoload, 2885 bool has_disabled, bool disabled, 2886 Error **errp) 2887 { 2888 BlockDriverState *bs; 2889 BdrvDirtyBitmap *bitmap; 2890 2891 if (!name || name[0] == '\0') { 2892 error_setg(errp, "Bitmap name cannot be empty"); 2893 return; 2894 } 2895 2896 bs = bdrv_lookup_bs(node, node, errp); 2897 if (!bs) { 2898 return; 2899 } 2900 2901 if (has_granularity) { 2902 if (granularity < 512 || !is_power_of_2(granularity)) { 2903 error_setg(errp, "Granularity must be power of 2 " 2904 "and at least 512"); 2905 return; 2906 } 2907 } else { 2908 /* Default to cluster size, if available: */ 2909 granularity = bdrv_get_default_bitmap_granularity(bs); 2910 } 2911 2912 if (!has_persistent) { 2913 persistent = false; 2914 } 2915 2916 if (has_autoload) { 2917 warn_report("Autoload option is deprecated and its value is ignored"); 2918 } 2919 2920 if (!has_disabled) { 2921 disabled = false; 2922 } 2923 2924 if (persistent && 2925 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) 2926 { 2927 return; 2928 } 2929 2930 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2931 if (bitmap == NULL) { 2932 return; 2933 } 2934 2935 if (disabled) { 2936 bdrv_disable_dirty_bitmap(bitmap); 2937 } 2938 2939 bdrv_dirty_bitmap_set_persistance(bitmap, persistent); 2940 } 2941 2942 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2943 Error **errp) 2944 { 2945 BlockDriverState *bs; 2946 BdrvDirtyBitmap *bitmap; 2947 Error *local_err = NULL; 2948 2949 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2950 if (!bitmap || !bs) { 2951 return; 2952 } 2953 2954 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2955 error_setg(errp, 2956 "Bitmap '%s' is currently frozen and cannot be removed", 2957 name); 2958 return; 2959 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) { 2960 error_setg(errp, 2961 "Bitmap '%s' is currently locked and cannot be removed", 2962 name); 2963 return; 2964 } 2965 2966 if (bdrv_dirty_bitmap_get_persistance(bitmap)) { 2967 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); 2968 if (local_err != NULL) { 2969 error_propagate(errp, local_err); 2970 return; 2971 } 2972 } 2973 2974 bdrv_release_dirty_bitmap(bs, bitmap); 2975 } 2976 2977 /** 2978 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2979 * immediately after a full backup operation. 2980 */ 2981 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2982 Error **errp) 2983 { 2984 BdrvDirtyBitmap *bitmap; 2985 BlockDriverState *bs; 2986 2987 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2988 if (!bitmap || !bs) { 2989 return; 2990 } 2991 2992 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2993 error_setg(errp, 2994 "Bitmap '%s' is currently frozen and cannot be modified", 2995 name); 2996 return; 2997 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) { 2998 error_setg(errp, 2999 "Bitmap '%s' is currently locked and cannot be modified", 3000 name); 3001 return; 3002 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 3003 error_setg(errp, 3004 "Bitmap '%s' is currently disabled and cannot be cleared", 3005 name); 3006 return; 3007 } else if (bdrv_dirty_bitmap_readonly(bitmap)) { 3008 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name); 3009 return; 3010 } 3011 3012 bdrv_clear_dirty_bitmap(bitmap, NULL); 3013 } 3014 3015 void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name, 3016 Error **errp) 3017 { 3018 BlockDriverState *bs; 3019 BdrvDirtyBitmap *bitmap; 3020 3021 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3022 if (!bitmap) { 3023 return; 3024 } 3025 3026 if (bdrv_dirty_bitmap_frozen(bitmap)) { 3027 error_setg(errp, 3028 "Bitmap '%s' is currently frozen and cannot be enabled", 3029 name); 3030 return; 3031 } 3032 3033 bdrv_enable_dirty_bitmap(bitmap); 3034 } 3035 3036 void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name, 3037 Error **errp) 3038 { 3039 BlockDriverState *bs; 3040 BdrvDirtyBitmap *bitmap; 3041 3042 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3043 if (!bitmap) { 3044 return; 3045 } 3046 3047 if (bdrv_dirty_bitmap_frozen(bitmap)) { 3048 error_setg(errp, 3049 "Bitmap '%s' is currently frozen and cannot be disabled", 3050 name); 3051 return; 3052 } 3053 3054 bdrv_disable_dirty_bitmap(bitmap); 3055 } 3056 3057 void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name, 3058 const char *src_name, Error **errp) 3059 { 3060 BlockDriverState *bs; 3061 BdrvDirtyBitmap *dst, *src; 3062 3063 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp); 3064 if (!dst) { 3065 return; 3066 } 3067 3068 if (bdrv_dirty_bitmap_frozen(dst)) { 3069 error_setg(errp, "Bitmap '%s' is frozen and cannot be modified", 3070 dst_name); 3071 return; 3072 } else if (bdrv_dirty_bitmap_readonly(dst)) { 3073 error_setg(errp, "Bitmap '%s' is readonly and cannot be modified", 3074 dst_name); 3075 return; 3076 } 3077 3078 src = bdrv_find_dirty_bitmap(bs, src_name); 3079 if (!src) { 3080 error_setg(errp, "Dirty bitmap '%s' not found", src_name); 3081 return; 3082 } 3083 3084 bdrv_merge_dirty_bitmap(dst, src, errp); 3085 } 3086 3087 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 3088 const char *name, 3089 Error **errp) 3090 { 3091 BdrvDirtyBitmap *bitmap; 3092 BlockDriverState *bs; 3093 BlockDirtyBitmapSha256 *ret = NULL; 3094 char *sha256; 3095 3096 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 3097 if (!bitmap || !bs) { 3098 return NULL; 3099 } 3100 3101 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 3102 if (sha256 == NULL) { 3103 return NULL; 3104 } 3105 3106 ret = g_new(BlockDirtyBitmapSha256, 1); 3107 ret->sha256 = sha256; 3108 3109 return ret; 3110 } 3111 3112 void hmp_drive_del(Monitor *mon, const QDict *qdict) 3113 { 3114 const char *id = qdict_get_str(qdict, "id"); 3115 BlockBackend *blk; 3116 BlockDriverState *bs; 3117 AioContext *aio_context; 3118 Error *local_err = NULL; 3119 3120 bs = bdrv_find_node(id); 3121 if (bs) { 3122 qmp_blockdev_del(id, &local_err); 3123 if (local_err) { 3124 error_report_err(local_err); 3125 } 3126 return; 3127 } 3128 3129 blk = blk_by_name(id); 3130 if (!blk) { 3131 error_report("Device '%s' not found", id); 3132 return; 3133 } 3134 3135 if (!blk_legacy_dinfo(blk)) { 3136 error_report("Deleting device added with blockdev-add" 3137 " is not supported"); 3138 return; 3139 } 3140 3141 aio_context = blk_get_aio_context(blk); 3142 aio_context_acquire(aio_context); 3143 3144 bs = blk_bs(blk); 3145 if (bs) { 3146 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 3147 error_report_err(local_err); 3148 aio_context_release(aio_context); 3149 return; 3150 } 3151 3152 blk_remove_bs(blk); 3153 } 3154 3155 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 3156 monitor_remove_blk(blk); 3157 3158 /* If this BlockBackend has a device attached to it, its refcount will be 3159 * decremented when the device is removed; otherwise we have to do so here. 3160 */ 3161 if (blk_get_attached_dev(blk)) { 3162 /* Further I/O must not pause the guest */ 3163 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 3164 BLOCKDEV_ON_ERROR_REPORT); 3165 } else { 3166 blk_unref(blk); 3167 } 3168 3169 aio_context_release(aio_context); 3170 } 3171 3172 void qmp_block_resize(bool has_device, const char *device, 3173 bool has_node_name, const char *node_name, 3174 int64_t size, Error **errp) 3175 { 3176 Error *local_err = NULL; 3177 BlockBackend *blk = NULL; 3178 BlockDriverState *bs; 3179 AioContext *aio_context; 3180 int ret; 3181 3182 bs = bdrv_lookup_bs(has_device ? device : NULL, 3183 has_node_name ? node_name : NULL, 3184 &local_err); 3185 if (local_err) { 3186 error_propagate(errp, local_err); 3187 return; 3188 } 3189 3190 aio_context = bdrv_get_aio_context(bs); 3191 aio_context_acquire(aio_context); 3192 3193 if (!bdrv_is_first_non_filter(bs)) { 3194 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3195 goto out; 3196 } 3197 3198 if (size < 0) { 3199 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3200 goto out; 3201 } 3202 3203 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3204 error_setg(errp, QERR_DEVICE_IN_USE, device); 3205 goto out; 3206 } 3207 3208 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3209 ret = blk_insert_bs(blk, bs, errp); 3210 if (ret < 0) { 3211 goto out; 3212 } 3213 3214 bdrv_drained_begin(bs); 3215 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3216 bdrv_drained_end(bs); 3217 3218 out: 3219 blk_unref(blk); 3220 aio_context_release(aio_context); 3221 } 3222 3223 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3224 bool has_base, const char *base, 3225 bool has_base_node, const char *base_node, 3226 bool has_backing_file, const char *backing_file, 3227 bool has_speed, int64_t speed, 3228 bool has_on_error, BlockdevOnError on_error, 3229 Error **errp) 3230 { 3231 BlockDriverState *bs, *iter; 3232 BlockDriverState *base_bs = NULL; 3233 AioContext *aio_context; 3234 Error *local_err = NULL; 3235 const char *base_name = NULL; 3236 3237 if (!has_on_error) { 3238 on_error = BLOCKDEV_ON_ERROR_REPORT; 3239 } 3240 3241 bs = bdrv_lookup_bs(device, device, errp); 3242 if (!bs) { 3243 return; 3244 } 3245 3246 aio_context = bdrv_get_aio_context(bs); 3247 aio_context_acquire(aio_context); 3248 3249 if (has_base && has_base_node) { 3250 error_setg(errp, "'base' and 'base-node' cannot be specified " 3251 "at the same time"); 3252 goto out; 3253 } 3254 3255 if (has_base) { 3256 base_bs = bdrv_find_backing_image(bs, base); 3257 if (base_bs == NULL) { 3258 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3259 goto out; 3260 } 3261 assert(bdrv_get_aio_context(base_bs) == aio_context); 3262 base_name = base; 3263 } 3264 3265 if (has_base_node) { 3266 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3267 if (!base_bs) { 3268 goto out; 3269 } 3270 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3271 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3272 base_node, device); 3273 goto out; 3274 } 3275 assert(bdrv_get_aio_context(base_bs) == aio_context); 3276 base_name = base_bs->filename; 3277 } 3278 3279 /* Check for op blockers in the whole chain between bs and base */ 3280 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3281 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3282 goto out; 3283 } 3284 } 3285 3286 /* if we are streaming the entire chain, the result will have no backing 3287 * file, and specifying one is therefore an error */ 3288 if (base_bs == NULL && has_backing_file) { 3289 error_setg(errp, "backing file specified, but streaming the " 3290 "entire chain"); 3291 goto out; 3292 } 3293 3294 /* backing_file string overrides base bs filename */ 3295 base_name = has_backing_file ? backing_file : base_name; 3296 3297 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3298 has_speed ? speed : 0, on_error, &local_err); 3299 if (local_err) { 3300 error_propagate(errp, local_err); 3301 goto out; 3302 } 3303 3304 trace_qmp_block_stream(bs, bs->job); 3305 3306 out: 3307 aio_context_release(aio_context); 3308 } 3309 3310 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3311 bool has_base, const char *base, 3312 bool has_top, const char *top, 3313 bool has_backing_file, const char *backing_file, 3314 bool has_speed, int64_t speed, 3315 bool has_filter_node_name, const char *filter_node_name, 3316 Error **errp) 3317 { 3318 BlockDriverState *bs; 3319 BlockDriverState *iter; 3320 BlockDriverState *base_bs, *top_bs; 3321 AioContext *aio_context; 3322 Error *local_err = NULL; 3323 /* This will be part of the QMP command, if/when the 3324 * BlockdevOnError change for blkmirror makes it in 3325 */ 3326 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3327 3328 if (!has_speed) { 3329 speed = 0; 3330 } 3331 if (!has_filter_node_name) { 3332 filter_node_name = NULL; 3333 } 3334 3335 /* Important Note: 3336 * libvirt relies on the DeviceNotFound error class in order to probe for 3337 * live commit feature versions; for this to work, we must make sure to 3338 * perform the device lookup before any generic errors that may occur in a 3339 * scenario in which all optional arguments are omitted. */ 3340 bs = qmp_get_root_bs(device, &local_err); 3341 if (!bs) { 3342 bs = bdrv_lookup_bs(device, device, NULL); 3343 if (!bs) { 3344 error_free(local_err); 3345 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3346 "Device '%s' not found", device); 3347 } else { 3348 error_propagate(errp, local_err); 3349 } 3350 return; 3351 } 3352 3353 aio_context = bdrv_get_aio_context(bs); 3354 aio_context_acquire(aio_context); 3355 3356 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3357 goto out; 3358 } 3359 3360 /* default top_bs is the active layer */ 3361 top_bs = bs; 3362 3363 if (has_top && top) { 3364 if (strcmp(bs->filename, top) != 0) { 3365 top_bs = bdrv_find_backing_image(bs, top); 3366 } 3367 } 3368 3369 if (top_bs == NULL) { 3370 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3371 goto out; 3372 } 3373 3374 assert(bdrv_get_aio_context(top_bs) == aio_context); 3375 3376 if (has_base && base) { 3377 base_bs = bdrv_find_backing_image(top_bs, base); 3378 } else { 3379 base_bs = bdrv_find_base(top_bs); 3380 } 3381 3382 if (base_bs == NULL) { 3383 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3384 goto out; 3385 } 3386 3387 assert(bdrv_get_aio_context(base_bs) == aio_context); 3388 3389 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3390 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3391 goto out; 3392 } 3393 } 3394 3395 /* Do not allow attempts to commit an image into itself */ 3396 if (top_bs == base_bs) { 3397 error_setg(errp, "cannot commit an image into itself"); 3398 goto out; 3399 } 3400 3401 if (top_bs == bs) { 3402 if (has_backing_file) { 3403 error_setg(errp, "'backing-file' specified," 3404 " but 'top' is the active layer"); 3405 goto out; 3406 } 3407 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3408 JOB_DEFAULT, speed, on_error, 3409 filter_node_name, NULL, NULL, false, &local_err); 3410 } else { 3411 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3412 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3413 goto out; 3414 } 3415 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed, 3416 on_error, has_backing_file ? backing_file : NULL, 3417 filter_node_name, &local_err); 3418 } 3419 if (local_err != NULL) { 3420 error_propagate(errp, local_err); 3421 goto out; 3422 } 3423 3424 out: 3425 aio_context_release(aio_context); 3426 } 3427 3428 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, 3429 Error **errp) 3430 { 3431 BlockDriverState *bs; 3432 BlockDriverState *target_bs; 3433 BlockDriverState *source = NULL; 3434 BlockJob *job = NULL; 3435 BdrvDirtyBitmap *bmap = NULL; 3436 AioContext *aio_context; 3437 QDict *options = NULL; 3438 Error *local_err = NULL; 3439 int flags, job_flags = JOB_DEFAULT; 3440 int64_t size; 3441 bool set_backing_hd = false; 3442 3443 if (!backup->has_speed) { 3444 backup->speed = 0; 3445 } 3446 if (!backup->has_on_source_error) { 3447 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3448 } 3449 if (!backup->has_on_target_error) { 3450 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3451 } 3452 if (!backup->has_mode) { 3453 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3454 } 3455 if (!backup->has_job_id) { 3456 backup->job_id = NULL; 3457 } 3458 if (!backup->has_auto_finalize) { 3459 backup->auto_finalize = true; 3460 } 3461 if (!backup->has_auto_dismiss) { 3462 backup->auto_dismiss = true; 3463 } 3464 if (!backup->has_compress) { 3465 backup->compress = false; 3466 } 3467 3468 bs = qmp_get_root_bs(backup->device, errp); 3469 if (!bs) { 3470 return NULL; 3471 } 3472 3473 aio_context = bdrv_get_aio_context(bs); 3474 aio_context_acquire(aio_context); 3475 3476 if (!backup->has_format) { 3477 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3478 NULL : (char*) bs->drv->format_name; 3479 } 3480 3481 /* Early check to avoid creating target */ 3482 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3483 goto out; 3484 } 3485 3486 flags = bs->open_flags | BDRV_O_RDWR; 3487 3488 /* See if we have a backing HD we can use to create our new image 3489 * on top of. */ 3490 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3491 source = backing_bs(bs); 3492 if (!source) { 3493 backup->sync = MIRROR_SYNC_MODE_FULL; 3494 } 3495 } 3496 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3497 source = bs; 3498 flags |= BDRV_O_NO_BACKING; 3499 set_backing_hd = true; 3500 } 3501 3502 size = bdrv_getlength(bs); 3503 if (size < 0) { 3504 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3505 goto out; 3506 } 3507 3508 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3509 assert(backup->format); 3510 if (source) { 3511 bdrv_img_create(backup->target, backup->format, source->filename, 3512 source->drv->format_name, NULL, 3513 size, flags, false, &local_err); 3514 } else { 3515 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3516 size, flags, false, &local_err); 3517 } 3518 } 3519 3520 if (local_err) { 3521 error_propagate(errp, local_err); 3522 goto out; 3523 } 3524 3525 if (backup->format) { 3526 if (!options) { 3527 options = qdict_new(); 3528 } 3529 qdict_put_str(options, "driver", backup->format); 3530 } 3531 3532 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3533 if (!target_bs) { 3534 goto out; 3535 } 3536 3537 bdrv_set_aio_context(target_bs, aio_context); 3538 3539 if (set_backing_hd) { 3540 bdrv_set_backing_hd(target_bs, source, &local_err); 3541 if (local_err) { 3542 bdrv_unref(target_bs); 3543 goto out; 3544 } 3545 } 3546 3547 if (backup->has_bitmap) { 3548 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3549 if (!bmap) { 3550 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3551 bdrv_unref(target_bs); 3552 goto out; 3553 } 3554 if (bdrv_dirty_bitmap_qmp_locked(bmap)) { 3555 error_setg(errp, 3556 "Bitmap '%s' is currently locked and cannot be used for " 3557 "backup", backup->bitmap); 3558 goto out; 3559 } 3560 } 3561 if (!backup->auto_finalize) { 3562 job_flags |= JOB_MANUAL_FINALIZE; 3563 } 3564 if (!backup->auto_dismiss) { 3565 job_flags |= JOB_MANUAL_DISMISS; 3566 } 3567 3568 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3569 backup->sync, bmap, backup->compress, 3570 backup->on_source_error, backup->on_target_error, 3571 job_flags, NULL, NULL, txn, &local_err); 3572 bdrv_unref(target_bs); 3573 if (local_err != NULL) { 3574 error_propagate(errp, local_err); 3575 goto out; 3576 } 3577 3578 out: 3579 aio_context_release(aio_context); 3580 return job; 3581 } 3582 3583 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3584 { 3585 3586 BlockJob *job; 3587 job = do_drive_backup(arg, NULL, errp); 3588 if (job) { 3589 job_start(&job->job); 3590 } 3591 } 3592 3593 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3594 { 3595 return bdrv_named_nodes_list(errp); 3596 } 3597 3598 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn, 3599 Error **errp) 3600 { 3601 BlockDriverState *bs; 3602 BlockDriverState *target_bs; 3603 Error *local_err = NULL; 3604 AioContext *aio_context; 3605 BlockJob *job = NULL; 3606 int job_flags = JOB_DEFAULT; 3607 3608 if (!backup->has_speed) { 3609 backup->speed = 0; 3610 } 3611 if (!backup->has_on_source_error) { 3612 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3613 } 3614 if (!backup->has_on_target_error) { 3615 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3616 } 3617 if (!backup->has_job_id) { 3618 backup->job_id = NULL; 3619 } 3620 if (!backup->has_auto_finalize) { 3621 backup->auto_finalize = true; 3622 } 3623 if (!backup->has_auto_dismiss) { 3624 backup->auto_dismiss = true; 3625 } 3626 if (!backup->has_compress) { 3627 backup->compress = false; 3628 } 3629 3630 bs = bdrv_lookup_bs(backup->device, backup->device, errp); 3631 if (!bs) { 3632 return NULL; 3633 } 3634 3635 aio_context = bdrv_get_aio_context(bs); 3636 aio_context_acquire(aio_context); 3637 3638 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3639 if (!target_bs) { 3640 goto out; 3641 } 3642 3643 if (bdrv_get_aio_context(target_bs) != aio_context) { 3644 if (!bdrv_has_blk(target_bs)) { 3645 /* The target BDS is not attached, we can safely move it to another 3646 * AioContext. */ 3647 bdrv_set_aio_context(target_bs, aio_context); 3648 } else { 3649 error_setg(errp, "Target is attached to a different thread from " 3650 "source."); 3651 goto out; 3652 } 3653 } 3654 if (!backup->auto_finalize) { 3655 job_flags |= JOB_MANUAL_FINALIZE; 3656 } 3657 if (!backup->auto_dismiss) { 3658 job_flags |= JOB_MANUAL_DISMISS; 3659 } 3660 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3661 backup->sync, NULL, backup->compress, 3662 backup->on_source_error, backup->on_target_error, 3663 job_flags, NULL, NULL, txn, &local_err); 3664 if (local_err != NULL) { 3665 error_propagate(errp, local_err); 3666 } 3667 out: 3668 aio_context_release(aio_context); 3669 return job; 3670 } 3671 3672 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3673 { 3674 BlockJob *job; 3675 job = do_blockdev_backup(arg, NULL, errp); 3676 if (job) { 3677 job_start(&job->job); 3678 } 3679 } 3680 3681 /* Parameter check and block job starting for drive mirroring. 3682 * Caller should hold @device and @target's aio context (must be the same). 3683 **/ 3684 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3685 BlockDriverState *target, 3686 bool has_replaces, const char *replaces, 3687 enum MirrorSyncMode sync, 3688 BlockMirrorBackingMode backing_mode, 3689 bool has_speed, int64_t speed, 3690 bool has_granularity, uint32_t granularity, 3691 bool has_buf_size, int64_t buf_size, 3692 bool has_on_source_error, 3693 BlockdevOnError on_source_error, 3694 bool has_on_target_error, 3695 BlockdevOnError on_target_error, 3696 bool has_unmap, bool unmap, 3697 bool has_filter_node_name, 3698 const char *filter_node_name, 3699 bool has_copy_mode, MirrorCopyMode copy_mode, 3700 Error **errp) 3701 { 3702 3703 if (!has_speed) { 3704 speed = 0; 3705 } 3706 if (!has_on_source_error) { 3707 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3708 } 3709 if (!has_on_target_error) { 3710 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3711 } 3712 if (!has_granularity) { 3713 granularity = 0; 3714 } 3715 if (!has_buf_size) { 3716 buf_size = 0; 3717 } 3718 if (!has_unmap) { 3719 unmap = true; 3720 } 3721 if (!has_filter_node_name) { 3722 filter_node_name = NULL; 3723 } 3724 if (!has_copy_mode) { 3725 copy_mode = MIRROR_COPY_MODE_BACKGROUND; 3726 } 3727 3728 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3729 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3730 "a value in range [512B, 64MB]"); 3731 return; 3732 } 3733 if (granularity & (granularity - 1)) { 3734 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3735 "power of 2"); 3736 return; 3737 } 3738 3739 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3740 return; 3741 } 3742 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3743 return; 3744 } 3745 3746 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3747 sync = MIRROR_SYNC_MODE_FULL; 3748 } 3749 3750 /* pass the node name to replace to mirror start since it's loose coupling 3751 * and will allow to check whether the node still exist at mirror completion 3752 */ 3753 mirror_start(job_id, bs, target, 3754 has_replaces ? replaces : NULL, 3755 speed, granularity, buf_size, sync, backing_mode, 3756 on_source_error, on_target_error, unmap, filter_node_name, 3757 copy_mode, errp); 3758 } 3759 3760 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3761 { 3762 BlockDriverState *bs; 3763 BlockDriverState *source, *target_bs; 3764 AioContext *aio_context; 3765 BlockMirrorBackingMode backing_mode; 3766 Error *local_err = NULL; 3767 QDict *options = NULL; 3768 int flags; 3769 int64_t size; 3770 const char *format = arg->format; 3771 3772 bs = qmp_get_root_bs(arg->device, errp); 3773 if (!bs) { 3774 return; 3775 } 3776 3777 /* Early check to avoid creating target */ 3778 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3779 return; 3780 } 3781 3782 aio_context = bdrv_get_aio_context(bs); 3783 aio_context_acquire(aio_context); 3784 3785 if (!arg->has_mode) { 3786 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3787 } 3788 3789 if (!arg->has_format) { 3790 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3791 ? NULL : bs->drv->format_name); 3792 } 3793 3794 flags = bs->open_flags | BDRV_O_RDWR; 3795 source = backing_bs(bs); 3796 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3797 arg->sync = MIRROR_SYNC_MODE_FULL; 3798 } 3799 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3800 source = bs; 3801 } 3802 3803 size = bdrv_getlength(bs); 3804 if (size < 0) { 3805 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3806 goto out; 3807 } 3808 3809 if (arg->has_replaces) { 3810 BlockDriverState *to_replace_bs; 3811 AioContext *replace_aio_context; 3812 int64_t replace_size; 3813 3814 if (!arg->has_node_name) { 3815 error_setg(errp, "a node-name must be provided when replacing a" 3816 " named node of the graph"); 3817 goto out; 3818 } 3819 3820 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err); 3821 3822 if (!to_replace_bs) { 3823 error_propagate(errp, local_err); 3824 goto out; 3825 } 3826 3827 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3828 aio_context_acquire(replace_aio_context); 3829 replace_size = bdrv_getlength(to_replace_bs); 3830 aio_context_release(replace_aio_context); 3831 3832 if (size != replace_size) { 3833 error_setg(errp, "cannot replace image with a mirror image of " 3834 "different size"); 3835 goto out; 3836 } 3837 } 3838 3839 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3840 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3841 } else { 3842 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3843 } 3844 3845 /* Don't open backing image in create() */ 3846 flags |= BDRV_O_NO_BACKING; 3847 3848 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3849 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3850 { 3851 /* create new image w/o backing file */ 3852 assert(format); 3853 bdrv_img_create(arg->target, format, 3854 NULL, NULL, NULL, size, flags, false, &local_err); 3855 } else { 3856 switch (arg->mode) { 3857 case NEW_IMAGE_MODE_EXISTING: 3858 break; 3859 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3860 /* create new image with backing file */ 3861 bdrv_img_create(arg->target, format, 3862 source->filename, 3863 source->drv->format_name, 3864 NULL, size, flags, false, &local_err); 3865 break; 3866 default: 3867 abort(); 3868 } 3869 } 3870 3871 if (local_err) { 3872 error_propagate(errp, local_err); 3873 goto out; 3874 } 3875 3876 options = qdict_new(); 3877 if (arg->has_node_name) { 3878 qdict_put_str(options, "node-name", arg->node_name); 3879 } 3880 if (format) { 3881 qdict_put_str(options, "driver", format); 3882 } 3883 3884 /* Mirroring takes care of copy-on-write using the source's backing 3885 * file. 3886 */ 3887 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3888 if (!target_bs) { 3889 goto out; 3890 } 3891 3892 bdrv_set_aio_context(target_bs, aio_context); 3893 3894 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3895 arg->has_replaces, arg->replaces, arg->sync, 3896 backing_mode, arg->has_speed, arg->speed, 3897 arg->has_granularity, arg->granularity, 3898 arg->has_buf_size, arg->buf_size, 3899 arg->has_on_source_error, arg->on_source_error, 3900 arg->has_on_target_error, arg->on_target_error, 3901 arg->has_unmap, arg->unmap, 3902 false, NULL, 3903 arg->has_copy_mode, arg->copy_mode, 3904 &local_err); 3905 bdrv_unref(target_bs); 3906 error_propagate(errp, local_err); 3907 out: 3908 aio_context_release(aio_context); 3909 } 3910 3911 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3912 const char *device, const char *target, 3913 bool has_replaces, const char *replaces, 3914 MirrorSyncMode sync, 3915 bool has_speed, int64_t speed, 3916 bool has_granularity, uint32_t granularity, 3917 bool has_buf_size, int64_t buf_size, 3918 bool has_on_source_error, 3919 BlockdevOnError on_source_error, 3920 bool has_on_target_error, 3921 BlockdevOnError on_target_error, 3922 bool has_filter_node_name, 3923 const char *filter_node_name, 3924 bool has_copy_mode, MirrorCopyMode copy_mode, 3925 Error **errp) 3926 { 3927 BlockDriverState *bs; 3928 BlockDriverState *target_bs; 3929 AioContext *aio_context; 3930 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3931 Error *local_err = NULL; 3932 3933 bs = qmp_get_root_bs(device, errp); 3934 if (!bs) { 3935 return; 3936 } 3937 3938 target_bs = bdrv_lookup_bs(target, target, errp); 3939 if (!target_bs) { 3940 return; 3941 } 3942 3943 aio_context = bdrv_get_aio_context(bs); 3944 aio_context_acquire(aio_context); 3945 3946 bdrv_set_aio_context(target_bs, aio_context); 3947 3948 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3949 has_replaces, replaces, sync, backing_mode, 3950 has_speed, speed, 3951 has_granularity, granularity, 3952 has_buf_size, buf_size, 3953 has_on_source_error, on_source_error, 3954 has_on_target_error, on_target_error, 3955 true, true, 3956 has_filter_node_name, filter_node_name, 3957 has_copy_mode, copy_mode, 3958 &local_err); 3959 error_propagate(errp, local_err); 3960 3961 aio_context_release(aio_context); 3962 } 3963 3964 /* Get a block job using its ID and acquire its AioContext */ 3965 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3966 Error **errp) 3967 { 3968 BlockJob *job; 3969 3970 assert(id != NULL); 3971 3972 *aio_context = NULL; 3973 3974 job = block_job_get(id); 3975 3976 if (!job) { 3977 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3978 "Block job '%s' not found", id); 3979 return NULL; 3980 } 3981 3982 *aio_context = blk_get_aio_context(job->blk); 3983 aio_context_acquire(*aio_context); 3984 3985 return job; 3986 } 3987 3988 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3989 { 3990 AioContext *aio_context; 3991 BlockJob *job = find_block_job(device, &aio_context, errp); 3992 3993 if (!job) { 3994 return; 3995 } 3996 3997 block_job_set_speed(job, speed, errp); 3998 aio_context_release(aio_context); 3999 } 4000 4001 void qmp_block_job_cancel(const char *device, 4002 bool has_force, bool force, Error **errp) 4003 { 4004 AioContext *aio_context; 4005 BlockJob *job = find_block_job(device, &aio_context, errp); 4006 4007 if (!job) { 4008 return; 4009 } 4010 4011 if (!has_force) { 4012 force = false; 4013 } 4014 4015 if (job_user_paused(&job->job) && !force) { 4016 error_setg(errp, "The block job for device '%s' is currently paused", 4017 device); 4018 goto out; 4019 } 4020 4021 trace_qmp_block_job_cancel(job); 4022 job_user_cancel(&job->job, force, errp); 4023 out: 4024 aio_context_release(aio_context); 4025 } 4026 4027 void qmp_block_job_pause(const char *device, Error **errp) 4028 { 4029 AioContext *aio_context; 4030 BlockJob *job = find_block_job(device, &aio_context, errp); 4031 4032 if (!job) { 4033 return; 4034 } 4035 4036 trace_qmp_block_job_pause(job); 4037 job_user_pause(&job->job, errp); 4038 aio_context_release(aio_context); 4039 } 4040 4041 void qmp_block_job_resume(const char *device, Error **errp) 4042 { 4043 AioContext *aio_context; 4044 BlockJob *job = find_block_job(device, &aio_context, errp); 4045 4046 if (!job) { 4047 return; 4048 } 4049 4050 trace_qmp_block_job_resume(job); 4051 job_user_resume(&job->job, errp); 4052 aio_context_release(aio_context); 4053 } 4054 4055 void qmp_block_job_complete(const char *device, Error **errp) 4056 { 4057 AioContext *aio_context; 4058 BlockJob *job = find_block_job(device, &aio_context, errp); 4059 4060 if (!job) { 4061 return; 4062 } 4063 4064 trace_qmp_block_job_complete(job); 4065 job_complete(&job->job, errp); 4066 aio_context_release(aio_context); 4067 } 4068 4069 void qmp_block_job_finalize(const char *id, Error **errp) 4070 { 4071 AioContext *aio_context; 4072 BlockJob *job = find_block_job(id, &aio_context, errp); 4073 4074 if (!job) { 4075 return; 4076 } 4077 4078 trace_qmp_block_job_finalize(job); 4079 job_finalize(&job->job, errp); 4080 aio_context_release(aio_context); 4081 } 4082 4083 void qmp_block_job_dismiss(const char *id, Error **errp) 4084 { 4085 AioContext *aio_context; 4086 BlockJob *bjob = find_block_job(id, &aio_context, errp); 4087 Job *job; 4088 4089 if (!bjob) { 4090 return; 4091 } 4092 4093 trace_qmp_block_job_dismiss(bjob); 4094 job = &bjob->job; 4095 job_dismiss(&job, errp); 4096 aio_context_release(aio_context); 4097 } 4098 4099 void qmp_change_backing_file(const char *device, 4100 const char *image_node_name, 4101 const char *backing_file, 4102 Error **errp) 4103 { 4104 BlockDriverState *bs = NULL; 4105 AioContext *aio_context; 4106 BlockDriverState *image_bs = NULL; 4107 Error *local_err = NULL; 4108 bool ro; 4109 int open_flags; 4110 int ret; 4111 4112 bs = qmp_get_root_bs(device, errp); 4113 if (!bs) { 4114 return; 4115 } 4116 4117 aio_context = bdrv_get_aio_context(bs); 4118 aio_context_acquire(aio_context); 4119 4120 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 4121 if (local_err) { 4122 error_propagate(errp, local_err); 4123 goto out; 4124 } 4125 4126 if (!image_bs) { 4127 error_setg(errp, "image file not found"); 4128 goto out; 4129 } 4130 4131 if (bdrv_find_base(image_bs) == image_bs) { 4132 error_setg(errp, "not allowing backing file change on an image " 4133 "without a backing file"); 4134 goto out; 4135 } 4136 4137 /* even though we are not necessarily operating on bs, we need it to 4138 * determine if block ops are currently prohibited on the chain */ 4139 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 4140 goto out; 4141 } 4142 4143 /* final sanity check */ 4144 if (!bdrv_chain_contains(bs, image_bs)) { 4145 error_setg(errp, "'%s' and image file are not in the same chain", 4146 device); 4147 goto out; 4148 } 4149 4150 /* if not r/w, reopen to make r/w */ 4151 open_flags = image_bs->open_flags; 4152 ro = bdrv_is_read_only(image_bs); 4153 4154 if (ro) { 4155 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 4156 if (local_err) { 4157 error_propagate(errp, local_err); 4158 goto out; 4159 } 4160 } 4161 4162 ret = bdrv_change_backing_file(image_bs, backing_file, 4163 image_bs->drv ? image_bs->drv->format_name : ""); 4164 4165 if (ret < 0) { 4166 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 4167 backing_file); 4168 /* don't exit here, so we can try to restore open flags if 4169 * appropriate */ 4170 } 4171 4172 if (ro) { 4173 bdrv_reopen(image_bs, open_flags, &local_err); 4174 error_propagate(errp, local_err); 4175 } 4176 4177 out: 4178 aio_context_release(aio_context); 4179 } 4180 4181 void hmp_drive_add_node(Monitor *mon, const char *optstr) 4182 { 4183 QemuOpts *opts; 4184 QDict *qdict; 4185 Error *local_err = NULL; 4186 4187 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 4188 if (!opts) { 4189 return; 4190 } 4191 4192 qdict = qemu_opts_to_qdict(opts, NULL); 4193 4194 if (!qdict_get_try_str(qdict, "node-name")) { 4195 qobject_unref(qdict); 4196 error_report("'node-name' needs to be specified"); 4197 goto out; 4198 } 4199 4200 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 4201 if (!bs) { 4202 error_report_err(local_err); 4203 goto out; 4204 } 4205 4206 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4207 4208 out: 4209 qemu_opts_del(opts); 4210 } 4211 4212 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 4213 { 4214 BlockDriverState *bs; 4215 QObject *obj; 4216 Visitor *v = qobject_output_visitor_new(&obj); 4217 QDict *qdict; 4218 Error *local_err = NULL; 4219 4220 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 4221 if (local_err) { 4222 error_propagate(errp, local_err); 4223 goto fail; 4224 } 4225 4226 visit_complete(v, &obj); 4227 qdict = qobject_to(QDict, obj); 4228 4229 qdict_flatten(qdict); 4230 4231 if (!qdict_get_try_str(qdict, "node-name")) { 4232 error_setg(errp, "'node-name' must be specified for the root node"); 4233 goto fail; 4234 } 4235 4236 bs = bds_tree_init(qdict, errp); 4237 if (!bs) { 4238 goto fail; 4239 } 4240 4241 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4242 4243 fail: 4244 visit_free(v); 4245 } 4246 4247 void qmp_blockdev_del(const char *node_name, Error **errp) 4248 { 4249 AioContext *aio_context; 4250 BlockDriverState *bs; 4251 4252 bs = bdrv_find_node(node_name); 4253 if (!bs) { 4254 error_setg(errp, "Cannot find node %s", node_name); 4255 return; 4256 } 4257 if (bdrv_has_blk(bs)) { 4258 error_setg(errp, "Node %s is in use", node_name); 4259 return; 4260 } 4261 aio_context = bdrv_get_aio_context(bs); 4262 aio_context_acquire(aio_context); 4263 4264 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4265 goto out; 4266 } 4267 4268 if (!bs->monitor_list.tqe_prev) { 4269 error_setg(errp, "Node %s is not owned by the monitor", 4270 bs->node_name); 4271 goto out; 4272 } 4273 4274 if (bs->refcnt > 1) { 4275 error_setg(errp, "Block device %s is in use", 4276 bdrv_get_device_or_node_name(bs)); 4277 goto out; 4278 } 4279 4280 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4281 bdrv_unref(bs); 4282 4283 out: 4284 aio_context_release(aio_context); 4285 } 4286 4287 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4288 const char *child_name) 4289 { 4290 BdrvChild *child; 4291 4292 QLIST_FOREACH(child, &parent_bs->children, next) { 4293 if (strcmp(child->name, child_name) == 0) { 4294 return child; 4295 } 4296 } 4297 4298 return NULL; 4299 } 4300 4301 void qmp_x_blockdev_change(const char *parent, bool has_child, 4302 const char *child, bool has_node, 4303 const char *node, Error **errp) 4304 { 4305 BlockDriverState *parent_bs, *new_bs = NULL; 4306 BdrvChild *p_child; 4307 4308 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4309 if (!parent_bs) { 4310 return; 4311 } 4312 4313 if (has_child == has_node) { 4314 if (has_child) { 4315 error_setg(errp, "The parameters child and node are in conflict"); 4316 } else { 4317 error_setg(errp, "Either child or node must be specified"); 4318 } 4319 return; 4320 } 4321 4322 if (has_child) { 4323 p_child = bdrv_find_child(parent_bs, child); 4324 if (!p_child) { 4325 error_setg(errp, "Node '%s' does not have child '%s'", 4326 parent, child); 4327 return; 4328 } 4329 bdrv_del_child(parent_bs, p_child, errp); 4330 } 4331 4332 if (has_node) { 4333 new_bs = bdrv_find_node(node); 4334 if (!new_bs) { 4335 error_setg(errp, "Node '%s' not found", node); 4336 return; 4337 } 4338 bdrv_add_child(parent_bs, new_bs, errp); 4339 } 4340 } 4341 4342 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4343 { 4344 BlockJobInfoList *head = NULL, **p_next = &head; 4345 BlockJob *job; 4346 4347 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4348 BlockJobInfoList *elem; 4349 AioContext *aio_context; 4350 4351 if (block_job_is_internal(job)) { 4352 continue; 4353 } 4354 elem = g_new0(BlockJobInfoList, 1); 4355 aio_context = blk_get_aio_context(job->blk); 4356 aio_context_acquire(aio_context); 4357 elem->value = block_job_query(job, errp); 4358 aio_context_release(aio_context); 4359 if (!elem->value) { 4360 g_free(elem); 4361 qapi_free_BlockJobInfoList(head); 4362 return NULL; 4363 } 4364 *p_next = elem; 4365 p_next = &elem->next; 4366 } 4367 4368 return head; 4369 } 4370 4371 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, 4372 bool has_force, bool force, Error **errp) 4373 { 4374 AioContext *old_context; 4375 AioContext *new_context; 4376 BlockDriverState *bs; 4377 4378 bs = bdrv_find_node(node_name); 4379 if (!bs) { 4380 error_setg(errp, "Cannot find node %s", node_name); 4381 return; 4382 } 4383 4384 /* Protects against accidents. */ 4385 if (!(has_force && force) && bdrv_has_blk(bs)) { 4386 error_setg(errp, "Node %s is associated with a BlockBackend and could " 4387 "be in use (use force=true to override this check)", 4388 node_name); 4389 return; 4390 } 4391 4392 if (iothread->type == QTYPE_QSTRING) { 4393 IOThread *obj = iothread_by_id(iothread->u.s); 4394 if (!obj) { 4395 error_setg(errp, "Cannot find iothread %s", iothread->u.s); 4396 return; 4397 } 4398 4399 new_context = iothread_get_aio_context(obj); 4400 } else { 4401 new_context = qemu_get_aio_context(); 4402 } 4403 4404 old_context = bdrv_get_aio_context(bs); 4405 aio_context_acquire(old_context); 4406 4407 bdrv_set_aio_context(bs, new_context); 4408 4409 aio_context_release(old_context); 4410 } 4411 4412 void qmp_x_block_latency_histogram_set( 4413 const char *device, 4414 bool has_boundaries, uint64List *boundaries, 4415 bool has_boundaries_read, uint64List *boundaries_read, 4416 bool has_boundaries_write, uint64List *boundaries_write, 4417 bool has_boundaries_flush, uint64List *boundaries_flush, 4418 Error **errp) 4419 { 4420 BlockBackend *blk = blk_by_name(device); 4421 BlockAcctStats *stats; 4422 4423 if (!blk) { 4424 error_setg(errp, "Device '%s' not found", device); 4425 return; 4426 } 4427 stats = blk_get_stats(blk); 4428 4429 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write && 4430 !has_boundaries_flush) 4431 { 4432 block_latency_histograms_clear(stats); 4433 return; 4434 } 4435 4436 if (has_boundaries || has_boundaries_read) { 4437 block_latency_histogram_set( 4438 stats, BLOCK_ACCT_READ, 4439 has_boundaries_read ? boundaries_read : boundaries); 4440 } 4441 4442 if (has_boundaries || has_boundaries_write) { 4443 block_latency_histogram_set( 4444 stats, BLOCK_ACCT_WRITE, 4445 has_boundaries_write ? boundaries_write : boundaries); 4446 } 4447 4448 if (has_boundaries || has_boundaries_flush) { 4449 block_latency_histogram_set( 4450 stats, BLOCK_ACCT_FLUSH, 4451 has_boundaries_flush ? boundaries_flush : boundaries); 4452 } 4453 } 4454 4455 QemuOptsList qemu_common_drive_opts = { 4456 .name = "drive", 4457 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4458 .desc = { 4459 { 4460 .name = "snapshot", 4461 .type = QEMU_OPT_BOOL, 4462 .help = "enable/disable snapshot mode", 4463 },{ 4464 .name = "aio", 4465 .type = QEMU_OPT_STRING, 4466 .help = "host AIO implementation (threads, native)", 4467 },{ 4468 .name = BDRV_OPT_CACHE_WB, 4469 .type = QEMU_OPT_BOOL, 4470 .help = "Enable writeback mode", 4471 },{ 4472 .name = "format", 4473 .type = QEMU_OPT_STRING, 4474 .help = "disk format (raw, qcow2, ...)", 4475 },{ 4476 .name = "rerror", 4477 .type = QEMU_OPT_STRING, 4478 .help = "read error action", 4479 },{ 4480 .name = "werror", 4481 .type = QEMU_OPT_STRING, 4482 .help = "write error action", 4483 },{ 4484 .name = BDRV_OPT_READ_ONLY, 4485 .type = QEMU_OPT_BOOL, 4486 .help = "open drive file as read-only", 4487 }, 4488 4489 THROTTLE_OPTS, 4490 4491 { 4492 .name = "throttling.group", 4493 .type = QEMU_OPT_STRING, 4494 .help = "name of the block throttling group", 4495 },{ 4496 .name = "copy-on-read", 4497 .type = QEMU_OPT_BOOL, 4498 .help = "copy read data from backing file into image file", 4499 },{ 4500 .name = "detect-zeroes", 4501 .type = QEMU_OPT_STRING, 4502 .help = "try to optimize zero writes (off, on, unmap)", 4503 },{ 4504 .name = "stats-account-invalid", 4505 .type = QEMU_OPT_BOOL, 4506 .help = "whether to account for invalid I/O operations " 4507 "in the statistics", 4508 },{ 4509 .name = "stats-account-failed", 4510 .type = QEMU_OPT_BOOL, 4511 .help = "whether to account for failed I/O operations " 4512 "in the statistics", 4513 }, 4514 { /* end of list */ } 4515 }, 4516 }; 4517 4518 QemuOptsList qemu_drive_opts = { 4519 .name = "drive", 4520 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4521 .desc = { 4522 /* 4523 * no elements => accept any params 4524 * validation will happen later 4525 */ 4526 { /* end of list */ } 4527 }, 4528 }; 4529