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