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/qmp/types.h" 44 #include "qapi-visit.h" 45 #include "qapi/qmp/qerror.h" 46 #include "qapi/qobject-output-visitor.h" 47 #include "sysemu/sysemu.h" 48 #include "block/block_int.h" 49 #include "qmp-commands.h" 50 #include "block/trace.h" 51 #include "sysemu/arch_init.h" 52 #include "sysemu/qtest.h" 53 #include "qemu/cutils.h" 54 #include "qemu/help_option.h" 55 #include "qemu/throttle-options.h" 56 57 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = 58 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); 59 60 static int do_open_tray(const char *blk_name, const char *qdev_id, 61 bool force, Error **errp); 62 63 static const char *const if_name[IF_COUNT] = { 64 [IF_NONE] = "none", 65 [IF_IDE] = "ide", 66 [IF_SCSI] = "scsi", 67 [IF_FLOPPY] = "floppy", 68 [IF_PFLASH] = "pflash", 69 [IF_MTD] = "mtd", 70 [IF_SD] = "sd", 71 [IF_VIRTIO] = "virtio", 72 [IF_XEN] = "xen", 73 }; 74 75 static int if_max_devs[IF_COUNT] = { 76 /* 77 * Do not change these numbers! They govern how drive option 78 * index maps to unit and bus. That mapping is ABI. 79 * 80 * All controllers used to implement if=T drives need to support 81 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 82 * Otherwise, some index values map to "impossible" bus, unit 83 * values. 84 * 85 * For instance, if you change [IF_SCSI] to 255, -drive 86 * if=scsi,index=12 no longer means bus=1,unit=5, but 87 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 88 * the drive can't be set up. Regression. 89 */ 90 [IF_IDE] = 2, 91 [IF_SCSI] = 7, 92 }; 93 94 /** 95 * Boards may call this to offer board-by-board overrides 96 * of the default, global values. 97 */ 98 void override_max_devs(BlockInterfaceType type, int max_devs) 99 { 100 BlockBackend *blk; 101 DriveInfo *dinfo; 102 103 if (max_devs <= 0) { 104 return; 105 } 106 107 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 108 dinfo = blk_legacy_dinfo(blk); 109 if (dinfo->type == type) { 110 fprintf(stderr, "Cannot override units-per-bus property of" 111 " the %s interface, because a drive of that type has" 112 " already been added.\n", if_name[type]); 113 g_assert_not_reached(); 114 } 115 } 116 117 if_max_devs[type] = max_devs; 118 } 119 120 /* 121 * We automatically delete the drive when a device using it gets 122 * unplugged. Questionable feature, but we can't just drop it. 123 * Device models call blockdev_mark_auto_del() to schedule the 124 * automatic deletion, and generic qdev code calls blockdev_auto_del() 125 * when deletion is actually safe. 126 */ 127 void blockdev_mark_auto_del(BlockBackend *blk) 128 { 129 DriveInfo *dinfo = blk_legacy_dinfo(blk); 130 BlockDriverState *bs = blk_bs(blk); 131 AioContext *aio_context; 132 133 if (!dinfo) { 134 return; 135 } 136 137 if (bs) { 138 aio_context = bdrv_get_aio_context(bs); 139 aio_context_acquire(aio_context); 140 141 if (bs->job) { 142 block_job_cancel(bs->job); 143 } 144 145 aio_context_release(aio_context); 146 } 147 148 dinfo->auto_del = 1; 149 } 150 151 void blockdev_auto_del(BlockBackend *blk) 152 { 153 DriveInfo *dinfo = blk_legacy_dinfo(blk); 154 155 if (dinfo && dinfo->auto_del) { 156 monitor_remove_blk(blk); 157 blk_unref(blk); 158 } 159 } 160 161 /** 162 * Returns the current mapping of how many units per bus 163 * a particular interface can support. 164 * 165 * A positive integer indicates n units per bus. 166 * 0 implies the mapping has not been established. 167 * -1 indicates an invalid BlockInterfaceType was given. 168 */ 169 int drive_get_max_devs(BlockInterfaceType type) 170 { 171 if (type >= IF_IDE && type < IF_COUNT) { 172 return if_max_devs[type]; 173 } 174 175 return -1; 176 } 177 178 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 179 { 180 int max_devs = if_max_devs[type]; 181 return max_devs ? index / max_devs : 0; 182 } 183 184 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 185 { 186 int max_devs = if_max_devs[type]; 187 return max_devs ? index % max_devs : index; 188 } 189 190 QemuOpts *drive_def(const char *optstr) 191 { 192 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 193 } 194 195 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 196 const char *optstr) 197 { 198 QemuOpts *opts; 199 200 opts = drive_def(optstr); 201 if (!opts) { 202 return NULL; 203 } 204 if (type != IF_DEFAULT) { 205 qemu_opt_set(opts, "if", if_name[type], &error_abort); 206 } 207 if (index >= 0) { 208 qemu_opt_set_number(opts, "index", index, &error_abort); 209 } 210 if (file) 211 qemu_opt_set(opts, "file", file, &error_abort); 212 return opts; 213 } 214 215 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 216 { 217 BlockBackend *blk; 218 DriveInfo *dinfo; 219 220 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 221 dinfo = blk_legacy_dinfo(blk); 222 if (dinfo && dinfo->type == type 223 && dinfo->bus == bus && dinfo->unit == unit) { 224 return dinfo; 225 } 226 } 227 228 return NULL; 229 } 230 231 void drive_check_orphaned(void) 232 { 233 BlockBackend *blk; 234 DriveInfo *dinfo; 235 Location loc; 236 bool orphans = false; 237 238 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 239 dinfo = blk_legacy_dinfo(blk); 240 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 241 dinfo->type != IF_NONE) { 242 loc_push_none(&loc); 243 qemu_opts_loc_restore(dinfo->opts); 244 error_report("machine type does not support" 245 " if=%s,bus=%d,unit=%d", 246 if_name[dinfo->type], dinfo->bus, dinfo->unit); 247 loc_pop(&loc); 248 orphans = true; 249 } 250 } 251 252 if (orphans) { 253 exit(1); 254 } 255 } 256 257 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 258 { 259 return drive_get(type, 260 drive_index_to_bus_id(type, index), 261 drive_index_to_unit_id(type, index)); 262 } 263 264 int drive_get_max_bus(BlockInterfaceType type) 265 { 266 int max_bus; 267 BlockBackend *blk; 268 DriveInfo *dinfo; 269 270 max_bus = -1; 271 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 272 dinfo = blk_legacy_dinfo(blk); 273 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 274 max_bus = dinfo->bus; 275 } 276 } 277 return max_bus; 278 } 279 280 /* Get a block device. This should only be used for single-drive devices 281 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 282 appropriate bus. */ 283 DriveInfo *drive_get_next(BlockInterfaceType type) 284 { 285 static int next_block_unit[IF_COUNT]; 286 287 return drive_get(type, 0, next_block_unit[type]++); 288 } 289 290 static void bdrv_format_print(void *opaque, const char *name) 291 { 292 error_printf(" %s", name); 293 } 294 295 typedef struct { 296 QEMUBH *bh; 297 BlockDriverState *bs; 298 } BDRVPutRefBH; 299 300 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 301 { 302 if (!strcmp(buf, "ignore")) { 303 return BLOCKDEV_ON_ERROR_IGNORE; 304 } else if (!is_read && !strcmp(buf, "enospc")) { 305 return BLOCKDEV_ON_ERROR_ENOSPC; 306 } else if (!strcmp(buf, "stop")) { 307 return BLOCKDEV_ON_ERROR_STOP; 308 } else if (!strcmp(buf, "report")) { 309 return BLOCKDEV_ON_ERROR_REPORT; 310 } else { 311 error_setg(errp, "'%s' invalid %s error action", 312 buf, is_read ? "read" : "write"); 313 return -1; 314 } 315 } 316 317 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, 318 Error **errp) 319 { 320 const QListEntry *entry; 321 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { 322 switch (qobject_type(entry->value)) { 323 324 case QTYPE_QSTRING: { 325 unsigned long long length; 326 const char *str = qstring_get_str(qobject_to_qstring(entry->value)); 327 if (parse_uint_full(str, &length, 10) == 0 && 328 length > 0 && length <= UINT_MAX) { 329 block_acct_add_interval(stats, (unsigned) length); 330 } else { 331 error_setg(errp, "Invalid interval length: %s", str); 332 return false; 333 } 334 break; 335 } 336 337 case QTYPE_QNUM: { 338 int64_t length = qnum_get_int(qobject_to_qnum(entry->value)); 339 340 if (length > 0 && length <= UINT_MAX) { 341 block_acct_add_interval(stats, (unsigned) length); 342 } else { 343 error_setg(errp, "Invalid interval length: %" PRId64, length); 344 return false; 345 } 346 break; 347 } 348 349 default: 350 error_setg(errp, "The specification of stats-intervals is invalid"); 351 return false; 352 } 353 } 354 return true; 355 } 356 357 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 358 359 /* All parameters but @opts are optional and may be set to NULL. */ 360 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, 361 const char **throttling_group, ThrottleConfig *throttle_cfg, 362 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) 363 { 364 Error *local_error = NULL; 365 const char *aio; 366 367 if (bdrv_flags) { 368 if (qemu_opt_get_bool(opts, "copy-on-read", false)) { 369 *bdrv_flags |= BDRV_O_COPY_ON_READ; 370 } 371 372 if ((aio = qemu_opt_get(opts, "aio")) != NULL) { 373 if (!strcmp(aio, "native")) { 374 *bdrv_flags |= BDRV_O_NATIVE_AIO; 375 } else if (!strcmp(aio, "threads")) { 376 /* this is the default */ 377 } else { 378 error_setg(errp, "invalid aio option"); 379 return; 380 } 381 } 382 } 383 384 /* disk I/O throttling */ 385 if (throttling_group) { 386 *throttling_group = qemu_opt_get(opts, "throttling.group"); 387 } 388 389 if (throttle_cfg) { 390 throttle_config_init(throttle_cfg); 391 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = 392 qemu_opt_get_number(opts, "throttling.bps-total", 0); 393 throttle_cfg->buckets[THROTTLE_BPS_READ].avg = 394 qemu_opt_get_number(opts, "throttling.bps-read", 0); 395 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = 396 qemu_opt_get_number(opts, "throttling.bps-write", 0); 397 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = 398 qemu_opt_get_number(opts, "throttling.iops-total", 0); 399 throttle_cfg->buckets[THROTTLE_OPS_READ].avg = 400 qemu_opt_get_number(opts, "throttling.iops-read", 0); 401 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = 402 qemu_opt_get_number(opts, "throttling.iops-write", 0); 403 404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = 405 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 406 throttle_cfg->buckets[THROTTLE_BPS_READ].max = 407 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = 409 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = 411 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 412 throttle_cfg->buckets[THROTTLE_OPS_READ].max = 413 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = 415 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 416 417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = 418 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); 419 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = 420 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); 421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = 422 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); 423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = 424 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); 425 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = 426 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); 427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = 428 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); 429 430 throttle_cfg->op_size = 431 qemu_opt_get_number(opts, "throttling.iops-size", 0); 432 433 if (!throttle_is_valid(throttle_cfg, errp)) { 434 return; 435 } 436 } 437 438 if (detect_zeroes) { 439 *detect_zeroes = 440 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, 441 qemu_opt_get(opts, "detect-zeroes"), 442 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 443 &local_error); 444 if (local_error) { 445 error_propagate(errp, local_error); 446 return; 447 } 448 } 449 } 450 451 /* Takes the ownership of bs_opts */ 452 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 453 Error **errp) 454 { 455 const char *buf; 456 int bdrv_flags = 0; 457 int on_read_error, on_write_error; 458 bool account_invalid, account_failed; 459 bool writethrough, read_only; 460 BlockBackend *blk; 461 BlockDriverState *bs; 462 ThrottleConfig cfg; 463 int snapshot = 0; 464 Error *error = NULL; 465 QemuOpts *opts; 466 QDict *interval_dict = NULL; 467 QList *interval_list = NULL; 468 const char *id; 469 BlockdevDetectZeroesOptions detect_zeroes = 470 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; 471 const char *throttling_group = NULL; 472 473 /* Check common options by copying from bs_opts to opts, all other options 474 * stay in bs_opts for processing by bdrv_open(). */ 475 id = qdict_get_try_str(bs_opts, "id"); 476 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 477 if (error) { 478 error_propagate(errp, error); 479 goto err_no_opts; 480 } 481 482 qemu_opts_absorb_qdict(opts, bs_opts, &error); 483 if (error) { 484 error_propagate(errp, error); 485 goto early_err; 486 } 487 488 if (id) { 489 qdict_del(bs_opts, "id"); 490 } 491 492 /* extract parameters */ 493 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 494 495 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); 496 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); 497 498 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); 499 500 id = qemu_opts_id(opts); 501 502 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); 503 qdict_array_split(interval_dict, &interval_list); 504 505 if (qdict_size(interval_dict) != 0) { 506 error_setg(errp, "Invalid option stats-intervals.%s", 507 qdict_first(interval_dict)->key); 508 goto early_err; 509 } 510 511 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, 512 &detect_zeroes, &error); 513 if (error) { 514 error_propagate(errp, error); 515 goto early_err; 516 } 517 518 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 519 if (is_help_option(buf)) { 520 error_printf("Supported formats:"); 521 bdrv_iterate_format(bdrv_format_print, NULL); 522 error_printf("\n"); 523 goto early_err; 524 } 525 526 if (qdict_haskey(bs_opts, "driver")) { 527 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 528 goto early_err; 529 } 530 qdict_put_str(bs_opts, "driver", buf); 531 } 532 533 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 534 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 535 on_write_error = parse_block_error_action(buf, 0, &error); 536 if (error) { 537 error_propagate(errp, error); 538 goto early_err; 539 } 540 } 541 542 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 543 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 544 on_read_error = parse_block_error_action(buf, 1, &error); 545 if (error) { 546 error_propagate(errp, error); 547 goto early_err; 548 } 549 } 550 551 if (snapshot) { 552 bdrv_flags |= BDRV_O_SNAPSHOT; 553 } 554 555 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); 556 557 /* init */ 558 if ((!file || !*file) && !qdict_size(bs_opts)) { 559 BlockBackendRootState *blk_rs; 560 561 blk = blk_new(0, BLK_PERM_ALL); 562 blk_rs = blk_get_root_state(blk); 563 blk_rs->open_flags = bdrv_flags; 564 blk_rs->read_only = read_only; 565 blk_rs->detect_zeroes = detect_zeroes; 566 567 QDECREF(bs_opts); 568 } else { 569 if (file && !*file) { 570 file = NULL; 571 } 572 573 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 574 * with other callers) rather than what we want as the real defaults. 575 * Apply the defaults here instead. */ 576 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 577 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 578 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, 579 read_only ? "on" : "off"); 580 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); 581 582 if (runstate_check(RUN_STATE_INMIGRATE)) { 583 bdrv_flags |= BDRV_O_INACTIVE; 584 } 585 586 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); 587 if (!blk) { 588 goto err_no_bs_opts; 589 } 590 bs = blk_bs(blk); 591 592 bs->detect_zeroes = detect_zeroes; 593 594 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); 595 596 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { 597 blk_unref(blk); 598 blk = NULL; 599 goto err_no_bs_opts; 600 } 601 } 602 603 /* disk I/O throttling */ 604 if (throttle_enabled(&cfg)) { 605 if (!throttling_group) { 606 throttling_group = id; 607 } 608 blk_io_limits_enable(blk, throttling_group); 609 blk_set_io_limits(blk, &cfg); 610 } 611 612 blk_set_enable_write_cache(blk, !writethrough); 613 blk_set_on_error(blk, on_read_error, on_write_error); 614 615 if (!monitor_add_blk(blk, id, errp)) { 616 blk_unref(blk); 617 blk = NULL; 618 goto err_no_bs_opts; 619 } 620 621 err_no_bs_opts: 622 qemu_opts_del(opts); 623 QDECREF(interval_dict); 624 QDECREF(interval_list); 625 return blk; 626 627 early_err: 628 qemu_opts_del(opts); 629 QDECREF(interval_dict); 630 QDECREF(interval_list); 631 err_no_opts: 632 QDECREF(bs_opts); 633 return NULL; 634 } 635 636 /* Takes the ownership of bs_opts */ 637 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) 638 { 639 int bdrv_flags = 0; 640 641 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility 642 * with other callers) rather than what we want as the real defaults. 643 * Apply the defaults here instead. */ 644 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); 645 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); 646 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); 647 648 if (runstate_check(RUN_STATE_INMIGRATE)) { 649 bdrv_flags |= BDRV_O_INACTIVE; 650 } 651 652 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); 653 } 654 655 void blockdev_close_all_bdrv_states(void) 656 { 657 BlockDriverState *bs, *next_bs; 658 659 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { 660 AioContext *ctx = bdrv_get_aio_context(bs); 661 662 aio_context_acquire(ctx); 663 bdrv_unref(bs); 664 aio_context_release(ctx); 665 } 666 } 667 668 /* Iterates over the list of monitor-owned BlockDriverStates */ 669 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) 670 { 671 return bs ? QTAILQ_NEXT(bs, monitor_list) 672 : QTAILQ_FIRST(&monitor_bdrv_states); 673 } 674 675 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 676 Error **errp) 677 { 678 const char *value; 679 680 value = qemu_opt_get(opts, from); 681 if (value) { 682 if (qemu_opt_find(opts, to)) { 683 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 684 "same time", to, from); 685 return; 686 } 687 } 688 689 /* rename all items in opts */ 690 while ((value = qemu_opt_get(opts, from))) { 691 qemu_opt_set(opts, to, value, &error_abort); 692 qemu_opt_unset(opts, from); 693 } 694 } 695 696 QemuOptsList qemu_legacy_drive_opts = { 697 .name = "drive", 698 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 699 .desc = { 700 { 701 .name = "bus", 702 .type = QEMU_OPT_NUMBER, 703 .help = "bus number", 704 },{ 705 .name = "unit", 706 .type = QEMU_OPT_NUMBER, 707 .help = "unit number (i.e. lun for scsi)", 708 },{ 709 .name = "index", 710 .type = QEMU_OPT_NUMBER, 711 .help = "index number", 712 },{ 713 .name = "media", 714 .type = QEMU_OPT_STRING, 715 .help = "media type (disk, cdrom)", 716 },{ 717 .name = "if", 718 .type = QEMU_OPT_STRING, 719 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 720 },{ 721 .name = "cyls", 722 .type = QEMU_OPT_NUMBER, 723 .help = "number of cylinders (ide disk geometry)", 724 },{ 725 .name = "heads", 726 .type = QEMU_OPT_NUMBER, 727 .help = "number of heads (ide disk geometry)", 728 },{ 729 .name = "secs", 730 .type = QEMU_OPT_NUMBER, 731 .help = "number of sectors (ide disk geometry)", 732 },{ 733 .name = "trans", 734 .type = QEMU_OPT_STRING, 735 .help = "chs translation (auto, lba, none)", 736 },{ 737 .name = "boot", 738 .type = QEMU_OPT_BOOL, 739 .help = "(deprecated, ignored)", 740 },{ 741 .name = "addr", 742 .type = QEMU_OPT_STRING, 743 .help = "pci address (virtio only)", 744 },{ 745 .name = "serial", 746 .type = QEMU_OPT_STRING, 747 .help = "disk serial number", 748 },{ 749 .name = "file", 750 .type = QEMU_OPT_STRING, 751 .help = "file name", 752 }, 753 754 /* Options that are passed on, but have special semantics with -drive */ 755 { 756 .name = BDRV_OPT_READ_ONLY, 757 .type = QEMU_OPT_BOOL, 758 .help = "open drive file as read-only", 759 },{ 760 .name = "rerror", 761 .type = QEMU_OPT_STRING, 762 .help = "read error action", 763 },{ 764 .name = "werror", 765 .type = QEMU_OPT_STRING, 766 .help = "write error action", 767 },{ 768 .name = "copy-on-read", 769 .type = QEMU_OPT_BOOL, 770 .help = "copy read data from backing file into image file", 771 }, 772 773 { /* end of list */ } 774 }, 775 }; 776 777 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 778 { 779 const char *value; 780 BlockBackend *blk; 781 DriveInfo *dinfo = NULL; 782 QDict *bs_opts; 783 QemuOpts *legacy_opts; 784 DriveMediaType media = MEDIA_DISK; 785 BlockInterfaceType type; 786 int cyls, heads, secs, translation; 787 int max_devs, bus_id, unit_id, index; 788 const char *devaddr; 789 const char *werror, *rerror; 790 bool read_only = false; 791 bool copy_on_read; 792 const char *serial; 793 const char *filename; 794 Error *local_err = NULL; 795 int i; 796 const char *deprecated[] = { 797 "serial", "trans", "secs", "heads", "cyls", "addr" 798 }; 799 800 /* Change legacy command line options into QMP ones */ 801 static const struct { 802 const char *from; 803 const char *to; 804 } opt_renames[] = { 805 { "iops", "throttling.iops-total" }, 806 { "iops_rd", "throttling.iops-read" }, 807 { "iops_wr", "throttling.iops-write" }, 808 809 { "bps", "throttling.bps-total" }, 810 { "bps_rd", "throttling.bps-read" }, 811 { "bps_wr", "throttling.bps-write" }, 812 813 { "iops_max", "throttling.iops-total-max" }, 814 { "iops_rd_max", "throttling.iops-read-max" }, 815 { "iops_wr_max", "throttling.iops-write-max" }, 816 817 { "bps_max", "throttling.bps-total-max" }, 818 { "bps_rd_max", "throttling.bps-read-max" }, 819 { "bps_wr_max", "throttling.bps-write-max" }, 820 821 { "iops_size", "throttling.iops-size" }, 822 823 { "group", "throttling.group" }, 824 825 { "readonly", BDRV_OPT_READ_ONLY }, 826 }; 827 828 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 829 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 830 &local_err); 831 if (local_err) { 832 error_report_err(local_err); 833 return NULL; 834 } 835 } 836 837 value = qemu_opt_get(all_opts, "cache"); 838 if (value) { 839 int flags = 0; 840 bool writethrough; 841 842 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { 843 error_report("invalid cache option"); 844 return NULL; 845 } 846 847 /* Specific options take precedence */ 848 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 849 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 850 !writethrough, &error_abort); 851 } 852 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 853 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 854 !!(flags & BDRV_O_NOCACHE), &error_abort); 855 } 856 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 857 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 858 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 859 } 860 qemu_opt_unset(all_opts, "cache"); 861 } 862 863 /* Get a QDict for processing the options */ 864 bs_opts = qdict_new(); 865 qemu_opts_to_qdict(all_opts, bs_opts); 866 867 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 868 &error_abort); 869 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 870 if (local_err) { 871 error_report_err(local_err); 872 goto fail; 873 } 874 875 /* Deprecated option boot=[on|off] */ 876 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 877 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 878 "ignored. Future versions will reject this parameter. Please " 879 "update your scripts.\n"); 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 AioContext *aio_context; 2053 HBitmap *backup; 2054 bool prepared; 2055 } BlockDirtyBitmapState; 2056 2057 static void block_dirty_bitmap_add_prepare(BlkActionState *common, 2058 Error **errp) 2059 { 2060 Error *local_err = NULL; 2061 BlockDirtyBitmapAdd *action; 2062 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2063 common, common); 2064 2065 if (action_check_completion_mode(common, errp) < 0) { 2066 return; 2067 } 2068 2069 action = common->action->u.block_dirty_bitmap_add.data; 2070 /* AIO context taken and released within qmp_block_dirty_bitmap_add */ 2071 qmp_block_dirty_bitmap_add(action->node, action->name, 2072 action->has_granularity, action->granularity, 2073 action->has_persistent, action->persistent, 2074 action->has_autoload, action->autoload, 2075 &local_err); 2076 2077 if (!local_err) { 2078 state->prepared = true; 2079 } else { 2080 error_propagate(errp, local_err); 2081 } 2082 } 2083 2084 static void block_dirty_bitmap_add_abort(BlkActionState *common) 2085 { 2086 BlockDirtyBitmapAdd *action; 2087 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2088 common, common); 2089 2090 action = common->action->u.block_dirty_bitmap_add.data; 2091 /* Should not be able to fail: IF the bitmap was added via .prepare(), 2092 * then the node reference and bitmap name must have been valid. 2093 */ 2094 if (state->prepared) { 2095 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); 2096 } 2097 } 2098 2099 static void block_dirty_bitmap_clear_prepare(BlkActionState *common, 2100 Error **errp) 2101 { 2102 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2103 common, common); 2104 BlockDirtyBitmap *action; 2105 2106 if (action_check_completion_mode(common, errp) < 0) { 2107 return; 2108 } 2109 2110 action = common->action->u.block_dirty_bitmap_clear.data; 2111 state->bitmap = block_dirty_bitmap_lookup(action->node, 2112 action->name, 2113 &state->bs, 2114 errp); 2115 if (!state->bitmap) { 2116 return; 2117 } 2118 2119 if (bdrv_dirty_bitmap_frozen(state->bitmap)) { 2120 error_setg(errp, "Cannot modify a frozen bitmap"); 2121 return; 2122 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) { 2123 error_setg(errp, "Cannot clear a disabled bitmap"); 2124 return; 2125 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) { 2126 error_setg(errp, "Cannot clear a readonly bitmap"); 2127 return; 2128 } 2129 2130 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); 2131 /* AioContext is released in .clean() */ 2132 } 2133 2134 static void block_dirty_bitmap_clear_abort(BlkActionState *common) 2135 { 2136 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2137 common, common); 2138 2139 if (state->backup) { 2140 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup); 2141 } 2142 } 2143 2144 static void block_dirty_bitmap_clear_commit(BlkActionState *common) 2145 { 2146 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2147 common, common); 2148 2149 hbitmap_free(state->backup); 2150 } 2151 2152 static void block_dirty_bitmap_clear_clean(BlkActionState *common) 2153 { 2154 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, 2155 common, common); 2156 2157 if (state->aio_context) { 2158 aio_context_release(state->aio_context); 2159 } 2160 } 2161 2162 static void abort_prepare(BlkActionState *common, Error **errp) 2163 { 2164 error_setg(errp, "Transaction aborted using Abort action"); 2165 } 2166 2167 static void abort_commit(BlkActionState *common) 2168 { 2169 g_assert_not_reached(); /* this action never succeeds */ 2170 } 2171 2172 static const BlkActionOps actions[] = { 2173 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { 2174 .instance_size = sizeof(ExternalSnapshotState), 2175 .prepare = external_snapshot_prepare, 2176 .commit = external_snapshot_commit, 2177 .abort = external_snapshot_abort, 2178 .clean = external_snapshot_clean, 2179 }, 2180 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 2181 .instance_size = sizeof(ExternalSnapshotState), 2182 .prepare = external_snapshot_prepare, 2183 .commit = external_snapshot_commit, 2184 .abort = external_snapshot_abort, 2185 .clean = external_snapshot_clean, 2186 }, 2187 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 2188 .instance_size = sizeof(DriveBackupState), 2189 .prepare = drive_backup_prepare, 2190 .commit = drive_backup_commit, 2191 .abort = drive_backup_abort, 2192 .clean = drive_backup_clean, 2193 }, 2194 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 2195 .instance_size = sizeof(BlockdevBackupState), 2196 .prepare = blockdev_backup_prepare, 2197 .commit = blockdev_backup_commit, 2198 .abort = blockdev_backup_abort, 2199 .clean = blockdev_backup_clean, 2200 }, 2201 [TRANSACTION_ACTION_KIND_ABORT] = { 2202 .instance_size = sizeof(BlkActionState), 2203 .prepare = abort_prepare, 2204 .commit = abort_commit, 2205 }, 2206 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 2207 .instance_size = sizeof(InternalSnapshotState), 2208 .prepare = internal_snapshot_prepare, 2209 .abort = internal_snapshot_abort, 2210 .clean = internal_snapshot_clean, 2211 }, 2212 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { 2213 .instance_size = sizeof(BlockDirtyBitmapState), 2214 .prepare = block_dirty_bitmap_add_prepare, 2215 .abort = block_dirty_bitmap_add_abort, 2216 }, 2217 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { 2218 .instance_size = sizeof(BlockDirtyBitmapState), 2219 .prepare = block_dirty_bitmap_clear_prepare, 2220 .commit = block_dirty_bitmap_clear_commit, 2221 .abort = block_dirty_bitmap_clear_abort, 2222 .clean = block_dirty_bitmap_clear_clean, 2223 } 2224 }; 2225 2226 /** 2227 * Allocate a TransactionProperties structure if necessary, and fill 2228 * that structure with desired defaults if they are unset. 2229 */ 2230 static TransactionProperties *get_transaction_properties( 2231 TransactionProperties *props) 2232 { 2233 if (!props) { 2234 props = g_new0(TransactionProperties, 1); 2235 } 2236 2237 if (!props->has_completion_mode) { 2238 props->has_completion_mode = true; 2239 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; 2240 } 2241 2242 return props; 2243 } 2244 2245 /* 2246 * 'Atomic' group operations. The operations are performed as a set, and if 2247 * any fail then we roll back all operations in the group. 2248 */ 2249 void qmp_transaction(TransactionActionList *dev_list, 2250 bool has_props, 2251 struct TransactionProperties *props, 2252 Error **errp) 2253 { 2254 TransactionActionList *dev_entry = dev_list; 2255 BlockJobTxn *block_job_txn = NULL; 2256 BlkActionState *state, *next; 2257 Error *local_err = NULL; 2258 2259 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states; 2260 QSIMPLEQ_INIT(&snap_bdrv_states); 2261 2262 /* Does this transaction get canceled as a group on failure? 2263 * If not, we don't really need to make a BlockJobTxn. 2264 */ 2265 props = get_transaction_properties(props); 2266 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { 2267 block_job_txn = block_job_txn_new(); 2268 } 2269 2270 /* drain all i/o before any operations */ 2271 bdrv_drain_all(); 2272 2273 /* We don't do anything in this loop that commits us to the operations */ 2274 while (NULL != dev_entry) { 2275 TransactionAction *dev_info = NULL; 2276 const BlkActionOps *ops; 2277 2278 dev_info = dev_entry->value; 2279 dev_entry = dev_entry->next; 2280 2281 assert(dev_info->type < ARRAY_SIZE(actions)); 2282 2283 ops = &actions[dev_info->type]; 2284 assert(ops->instance_size > 0); 2285 2286 state = g_malloc0(ops->instance_size); 2287 state->ops = ops; 2288 state->action = dev_info; 2289 state->block_job_txn = block_job_txn; 2290 state->txn_props = props; 2291 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 2292 2293 state->ops->prepare(state, &local_err); 2294 if (local_err) { 2295 error_propagate(errp, local_err); 2296 goto delete_and_fail; 2297 } 2298 } 2299 2300 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2301 if (state->ops->commit) { 2302 state->ops->commit(state); 2303 } 2304 } 2305 2306 /* success */ 2307 goto exit; 2308 2309 delete_and_fail: 2310 /* failure, and it is all-or-none; roll back all operations */ 2311 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 2312 if (state->ops->abort) { 2313 state->ops->abort(state); 2314 } 2315 } 2316 exit: 2317 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 2318 if (state->ops->clean) { 2319 state->ops->clean(state); 2320 } 2321 g_free(state); 2322 } 2323 if (!has_props) { 2324 qapi_free_TransactionProperties(props); 2325 } 2326 block_job_txn_unref(block_job_txn); 2327 } 2328 2329 void qmp_eject(bool has_device, const char *device, 2330 bool has_id, const char *id, 2331 bool has_force, bool force, Error **errp) 2332 { 2333 Error *local_err = NULL; 2334 int rc; 2335 2336 if (!has_force) { 2337 force = false; 2338 } 2339 2340 rc = do_open_tray(has_device ? device : NULL, 2341 has_id ? id : NULL, 2342 force, &local_err); 2343 if (rc && rc != -ENOSYS) { 2344 error_propagate(errp, local_err); 2345 return; 2346 } 2347 error_free(local_err); 2348 2349 qmp_x_blockdev_remove_medium(has_device, device, has_id, id, errp); 2350 } 2351 2352 void qmp_block_passwd(bool has_device, const char *device, 2353 bool has_node_name, const char *node_name, 2354 const char *password, Error **errp) 2355 { 2356 error_setg(errp, 2357 "Setting block passwords directly is no longer supported"); 2358 } 2359 2360 /* 2361 * Attempt to open the tray of @device. 2362 * If @force, ignore its tray lock. 2363 * Else, if the tray is locked, don't open it, but ask the guest to open it. 2364 * On error, store an error through @errp and return -errno. 2365 * If @device does not exist, return -ENODEV. 2366 * If it has no removable media, return -ENOTSUP. 2367 * If it has no tray, return -ENOSYS. 2368 * If the guest was asked to open the tray, return -EINPROGRESS. 2369 * Else, return 0. 2370 */ 2371 static int do_open_tray(const char *blk_name, const char *qdev_id, 2372 bool force, Error **errp) 2373 { 2374 BlockBackend *blk; 2375 const char *device = qdev_id ?: blk_name; 2376 bool locked; 2377 2378 blk = qmp_get_blk(blk_name, qdev_id, errp); 2379 if (!blk) { 2380 return -ENODEV; 2381 } 2382 2383 if (!blk_dev_has_removable_media(blk)) { 2384 error_setg(errp, "Device '%s' is not removable", device); 2385 return -ENOTSUP; 2386 } 2387 2388 if (!blk_dev_has_tray(blk)) { 2389 error_setg(errp, "Device '%s' does not have a tray", device); 2390 return -ENOSYS; 2391 } 2392 2393 if (blk_dev_is_tray_open(blk)) { 2394 return 0; 2395 } 2396 2397 locked = blk_dev_is_medium_locked(blk); 2398 if (locked) { 2399 blk_dev_eject_request(blk, force); 2400 } 2401 2402 if (!locked || force) { 2403 blk_dev_change_media_cb(blk, false, &error_abort); 2404 } 2405 2406 if (locked && !force) { 2407 error_setg(errp, "Device '%s' is locked and force was not specified, " 2408 "wait for tray to open and try again", device); 2409 return -EINPROGRESS; 2410 } 2411 2412 return 0; 2413 } 2414 2415 void qmp_blockdev_open_tray(bool has_device, const char *device, 2416 bool has_id, const char *id, 2417 bool has_force, bool force, 2418 Error **errp) 2419 { 2420 Error *local_err = NULL; 2421 int rc; 2422 2423 if (!has_force) { 2424 force = false; 2425 } 2426 rc = do_open_tray(has_device ? device : NULL, 2427 has_id ? id : NULL, 2428 force, &local_err); 2429 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) { 2430 error_propagate(errp, local_err); 2431 return; 2432 } 2433 error_free(local_err); 2434 } 2435 2436 void qmp_blockdev_close_tray(bool has_device, const char *device, 2437 bool has_id, const char *id, 2438 Error **errp) 2439 { 2440 BlockBackend *blk; 2441 Error *local_err = NULL; 2442 2443 device = has_device ? device : NULL; 2444 id = has_id ? id : NULL; 2445 2446 blk = qmp_get_blk(device, id, errp); 2447 if (!blk) { 2448 return; 2449 } 2450 2451 if (!blk_dev_has_removable_media(blk)) { 2452 error_setg(errp, "Device '%s' is not removable", device ?: id); 2453 return; 2454 } 2455 2456 if (!blk_dev_has_tray(blk)) { 2457 /* Ignore this command on tray-less devices */ 2458 return; 2459 } 2460 2461 if (!blk_dev_is_tray_open(blk)) { 2462 return; 2463 } 2464 2465 blk_dev_change_media_cb(blk, true, &local_err); 2466 if (local_err) { 2467 error_propagate(errp, local_err); 2468 return; 2469 } 2470 } 2471 2472 void qmp_x_blockdev_remove_medium(bool has_device, const char *device, 2473 bool has_id, const char *id, Error **errp) 2474 { 2475 BlockBackend *blk; 2476 BlockDriverState *bs; 2477 AioContext *aio_context; 2478 bool has_attached_device; 2479 2480 device = has_device ? device : NULL; 2481 id = has_id ? id : NULL; 2482 2483 blk = qmp_get_blk(device, id, errp); 2484 if (!blk) { 2485 return; 2486 } 2487 2488 /* For BBs without a device, we can exchange the BDS tree at will */ 2489 has_attached_device = blk_get_attached_dev(blk); 2490 2491 if (has_attached_device && !blk_dev_has_removable_media(blk)) { 2492 error_setg(errp, "Device '%s' is not removable", device ?: id); 2493 return; 2494 } 2495 2496 if (has_attached_device && blk_dev_has_tray(blk) && 2497 !blk_dev_is_tray_open(blk)) 2498 { 2499 error_setg(errp, "Tray of device '%s' is not open", device ?: id); 2500 return; 2501 } 2502 2503 bs = blk_bs(blk); 2504 if (!bs) { 2505 return; 2506 } 2507 2508 aio_context = bdrv_get_aio_context(bs); 2509 aio_context_acquire(aio_context); 2510 2511 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 2512 goto out; 2513 } 2514 2515 blk_remove_bs(blk); 2516 2517 if (!blk_dev_has_tray(blk)) { 2518 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be 2519 * called at all); therefore, the medium needs to be ejected here. 2520 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load 2521 * value passed here (i.e. false). */ 2522 blk_dev_change_media_cb(blk, false, &error_abort); 2523 } 2524 2525 out: 2526 aio_context_release(aio_context); 2527 } 2528 2529 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk, 2530 BlockDriverState *bs, Error **errp) 2531 { 2532 Error *local_err = NULL; 2533 bool has_device; 2534 int ret; 2535 2536 /* For BBs without a device, we can exchange the BDS tree at will */ 2537 has_device = blk_get_attached_dev(blk); 2538 2539 if (has_device && !blk_dev_has_removable_media(blk)) { 2540 error_setg(errp, "Device is not removable"); 2541 return; 2542 } 2543 2544 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) { 2545 error_setg(errp, "Tray of the device is not open"); 2546 return; 2547 } 2548 2549 if (blk_bs(blk)) { 2550 error_setg(errp, "There already is a medium in the device"); 2551 return; 2552 } 2553 2554 ret = blk_insert_bs(blk, bs, errp); 2555 if (ret < 0) { 2556 return; 2557 } 2558 2559 if (!blk_dev_has_tray(blk)) { 2560 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be 2561 * called at all); therefore, the medium needs to be pushed into the 2562 * slot here. 2563 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load 2564 * value passed here (i.e. true). */ 2565 blk_dev_change_media_cb(blk, true, &local_err); 2566 if (local_err) { 2567 error_propagate(errp, local_err); 2568 blk_remove_bs(blk); 2569 return; 2570 } 2571 } 2572 } 2573 2574 void qmp_x_blockdev_insert_medium(bool has_device, const char *device, 2575 bool has_id, const char *id, 2576 const char *node_name, Error **errp) 2577 { 2578 BlockBackend *blk; 2579 BlockDriverState *bs; 2580 2581 blk = qmp_get_blk(has_device ? device : NULL, 2582 has_id ? id : NULL, 2583 errp); 2584 if (!blk) { 2585 return; 2586 } 2587 2588 bs = bdrv_find_node(node_name); 2589 if (!bs) { 2590 error_setg(errp, "Node '%s' not found", node_name); 2591 return; 2592 } 2593 2594 if (bdrv_has_blk(bs)) { 2595 error_setg(errp, "Node '%s' is already in use", node_name); 2596 return; 2597 } 2598 2599 qmp_blockdev_insert_anon_medium(blk, bs, errp); 2600 } 2601 2602 void qmp_blockdev_change_medium(bool has_device, const char *device, 2603 bool has_id, const char *id, 2604 const char *filename, 2605 bool has_format, const char *format, 2606 bool has_read_only, 2607 BlockdevChangeReadOnlyMode read_only, 2608 Error **errp) 2609 { 2610 BlockBackend *blk; 2611 BlockDriverState *medium_bs = NULL; 2612 int bdrv_flags; 2613 bool detect_zeroes; 2614 int rc; 2615 QDict *options = NULL; 2616 Error *err = NULL; 2617 2618 blk = qmp_get_blk(has_device ? device : NULL, 2619 has_id ? id : NULL, 2620 errp); 2621 if (!blk) { 2622 goto fail; 2623 } 2624 2625 if (blk_bs(blk)) { 2626 blk_update_root_state(blk); 2627 } 2628 2629 bdrv_flags = blk_get_open_flags_from_root_state(blk); 2630 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | 2631 BDRV_O_PROTOCOL); 2632 2633 if (!has_read_only) { 2634 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN; 2635 } 2636 2637 switch (read_only) { 2638 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN: 2639 break; 2640 2641 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY: 2642 bdrv_flags &= ~BDRV_O_RDWR; 2643 break; 2644 2645 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE: 2646 bdrv_flags |= BDRV_O_RDWR; 2647 break; 2648 2649 default: 2650 abort(); 2651 } 2652 2653 options = qdict_new(); 2654 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk); 2655 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off"); 2656 2657 if (has_format) { 2658 qdict_put_str(options, "driver", format); 2659 } 2660 2661 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp); 2662 if (!medium_bs) { 2663 goto fail; 2664 } 2665 2666 rc = do_open_tray(has_device ? device : NULL, 2667 has_id ? id : NULL, 2668 false, &err); 2669 if (rc && rc != -ENOSYS) { 2670 error_propagate(errp, err); 2671 goto fail; 2672 } 2673 error_free(err); 2674 err = NULL; 2675 2676 qmp_x_blockdev_remove_medium(has_device, device, has_id, id, &err); 2677 if (err) { 2678 error_propagate(errp, err); 2679 goto fail; 2680 } 2681 2682 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err); 2683 if (err) { 2684 error_propagate(errp, err); 2685 goto fail; 2686 } 2687 2688 qmp_blockdev_close_tray(has_device, device, has_id, id, errp); 2689 2690 fail: 2691 /* If the medium has been inserted, the device has its own reference, so 2692 * ours must be relinquished; and if it has not been inserted successfully, 2693 * the reference must be relinquished anyway */ 2694 bdrv_unref(medium_bs); 2695 } 2696 2697 /* throttling disk I/O limits */ 2698 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp) 2699 { 2700 ThrottleConfig cfg; 2701 BlockDriverState *bs; 2702 BlockBackend *blk; 2703 AioContext *aio_context; 2704 2705 blk = qmp_get_blk(arg->has_device ? arg->device : NULL, 2706 arg->has_id ? arg->id : NULL, 2707 errp); 2708 if (!blk) { 2709 return; 2710 } 2711 2712 aio_context = blk_get_aio_context(blk); 2713 aio_context_acquire(aio_context); 2714 2715 bs = blk_bs(blk); 2716 if (!bs) { 2717 error_setg(errp, "Device has no medium"); 2718 goto out; 2719 } 2720 2721 throttle_config_init(&cfg); 2722 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps; 2723 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd; 2724 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr; 2725 2726 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops; 2727 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd; 2728 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr; 2729 2730 if (arg->has_bps_max) { 2731 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max; 2732 } 2733 if (arg->has_bps_rd_max) { 2734 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max; 2735 } 2736 if (arg->has_bps_wr_max) { 2737 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max; 2738 } 2739 if (arg->has_iops_max) { 2740 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max; 2741 } 2742 if (arg->has_iops_rd_max) { 2743 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max; 2744 } 2745 if (arg->has_iops_wr_max) { 2746 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max; 2747 } 2748 2749 if (arg->has_bps_max_length) { 2750 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length; 2751 } 2752 if (arg->has_bps_rd_max_length) { 2753 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length; 2754 } 2755 if (arg->has_bps_wr_max_length) { 2756 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length; 2757 } 2758 if (arg->has_iops_max_length) { 2759 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length; 2760 } 2761 if (arg->has_iops_rd_max_length) { 2762 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length; 2763 } 2764 if (arg->has_iops_wr_max_length) { 2765 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length; 2766 } 2767 2768 if (arg->has_iops_size) { 2769 cfg.op_size = arg->iops_size; 2770 } 2771 2772 if (!throttle_is_valid(&cfg, errp)) { 2773 goto out; 2774 } 2775 2776 if (throttle_enabled(&cfg)) { 2777 /* Enable I/O limits if they're not enabled yet, otherwise 2778 * just update the throttling group. */ 2779 if (!blk_get_public(blk)->throttle_group_member.throttle_state) { 2780 blk_io_limits_enable(blk, 2781 arg->has_group ? arg->group : 2782 arg->has_device ? arg->device : 2783 arg->id); 2784 } else if (arg->has_group) { 2785 blk_io_limits_update_group(blk, arg->group); 2786 } 2787 /* Set the new throttling configuration */ 2788 blk_set_io_limits(blk, &cfg); 2789 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) { 2790 /* If all throttling settings are set to 0, disable I/O limits */ 2791 blk_io_limits_disable(blk); 2792 } 2793 2794 out: 2795 aio_context_release(aio_context); 2796 } 2797 2798 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2799 bool has_granularity, uint32_t granularity, 2800 bool has_persistent, bool persistent, 2801 bool has_autoload, bool autoload, 2802 Error **errp) 2803 { 2804 BlockDriverState *bs; 2805 BdrvDirtyBitmap *bitmap; 2806 2807 if (!name || name[0] == '\0') { 2808 error_setg(errp, "Bitmap name cannot be empty"); 2809 return; 2810 } 2811 2812 bs = bdrv_lookup_bs(node, node, errp); 2813 if (!bs) { 2814 return; 2815 } 2816 2817 if (has_granularity) { 2818 if (granularity < 512 || !is_power_of_2(granularity)) { 2819 error_setg(errp, "Granularity must be power of 2 " 2820 "and at least 512"); 2821 return; 2822 } 2823 } else { 2824 /* Default to cluster size, if available: */ 2825 granularity = bdrv_get_default_bitmap_granularity(bs); 2826 } 2827 2828 if (!has_persistent) { 2829 persistent = false; 2830 } 2831 if (!has_autoload) { 2832 autoload = false; 2833 } 2834 2835 if (has_autoload && !persistent) { 2836 error_setg(errp, "Autoload flag must be used only for persistent " 2837 "bitmaps"); 2838 return; 2839 } 2840 2841 if (persistent && 2842 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) 2843 { 2844 return; 2845 } 2846 2847 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2848 if (bitmap == NULL) { 2849 return; 2850 } 2851 2852 bdrv_dirty_bitmap_set_persistance(bitmap, persistent); 2853 bdrv_dirty_bitmap_set_autoload(bitmap, autoload); 2854 } 2855 2856 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2857 Error **errp) 2858 { 2859 BlockDriverState *bs; 2860 BdrvDirtyBitmap *bitmap; 2861 Error *local_err = NULL; 2862 2863 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2864 if (!bitmap || !bs) { 2865 return; 2866 } 2867 2868 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2869 error_setg(errp, 2870 "Bitmap '%s' is currently frozen 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_enabled(bitmap)) { 2908 error_setg(errp, 2909 "Bitmap '%s' is currently disabled and cannot be cleared", 2910 name); 2911 return; 2912 } else if (bdrv_dirty_bitmap_readonly(bitmap)) { 2913 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name); 2914 return; 2915 } 2916 2917 bdrv_clear_dirty_bitmap(bitmap, NULL); 2918 } 2919 2920 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, 2921 const char *name, 2922 Error **errp) 2923 { 2924 BdrvDirtyBitmap *bitmap; 2925 BlockDriverState *bs; 2926 BlockDirtyBitmapSha256 *ret = NULL; 2927 char *sha256; 2928 2929 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); 2930 if (!bitmap || !bs) { 2931 return NULL; 2932 } 2933 2934 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); 2935 if (sha256 == NULL) { 2936 return NULL; 2937 } 2938 2939 ret = g_new(BlockDirtyBitmapSha256, 1); 2940 ret->sha256 = sha256; 2941 2942 return ret; 2943 } 2944 2945 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2946 { 2947 const char *id = qdict_get_str(qdict, "id"); 2948 BlockBackend *blk; 2949 BlockDriverState *bs; 2950 AioContext *aio_context; 2951 Error *local_err = NULL; 2952 2953 bs = bdrv_find_node(id); 2954 if (bs) { 2955 qmp_blockdev_del(id, &local_err); 2956 if (local_err) { 2957 error_report_err(local_err); 2958 } 2959 return; 2960 } 2961 2962 blk = blk_by_name(id); 2963 if (!blk) { 2964 error_report("Device '%s' not found", id); 2965 return; 2966 } 2967 2968 if (!blk_legacy_dinfo(blk)) { 2969 error_report("Deleting device added with blockdev-add" 2970 " is not supported"); 2971 return; 2972 } 2973 2974 aio_context = blk_get_aio_context(blk); 2975 aio_context_acquire(aio_context); 2976 2977 bs = blk_bs(blk); 2978 if (bs) { 2979 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2980 error_report_err(local_err); 2981 aio_context_release(aio_context); 2982 return; 2983 } 2984 2985 blk_remove_bs(blk); 2986 } 2987 2988 /* Make the BlockBackend and the attached BlockDriverState anonymous */ 2989 monitor_remove_blk(blk); 2990 2991 /* If this BlockBackend has a device attached to it, its refcount will be 2992 * decremented when the device is removed; otherwise we have to do so here. 2993 */ 2994 if (blk_get_attached_dev(blk)) { 2995 /* Further I/O must not pause the guest */ 2996 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT, 2997 BLOCKDEV_ON_ERROR_REPORT); 2998 } else { 2999 blk_unref(blk); 3000 } 3001 3002 aio_context_release(aio_context); 3003 } 3004 3005 void qmp_block_resize(bool has_device, const char *device, 3006 bool has_node_name, const char *node_name, 3007 int64_t size, Error **errp) 3008 { 3009 Error *local_err = NULL; 3010 BlockBackend *blk = NULL; 3011 BlockDriverState *bs; 3012 AioContext *aio_context; 3013 int ret; 3014 3015 bs = bdrv_lookup_bs(has_device ? device : NULL, 3016 has_node_name ? node_name : NULL, 3017 &local_err); 3018 if (local_err) { 3019 error_propagate(errp, local_err); 3020 return; 3021 } 3022 3023 aio_context = bdrv_get_aio_context(bs); 3024 aio_context_acquire(aio_context); 3025 3026 if (!bdrv_is_first_non_filter(bs)) { 3027 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 3028 goto out; 3029 } 3030 3031 if (size < 0) { 3032 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 3033 goto out; 3034 } 3035 3036 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 3037 error_setg(errp, QERR_DEVICE_IN_USE, device); 3038 goto out; 3039 } 3040 3041 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); 3042 ret = blk_insert_bs(blk, bs, errp); 3043 if (ret < 0) { 3044 goto out; 3045 } 3046 3047 bdrv_drained_begin(bs); 3048 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp); 3049 bdrv_drained_end(bs); 3050 3051 out: 3052 blk_unref(blk); 3053 aio_context_release(aio_context); 3054 } 3055 3056 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, 3057 bool has_base, const char *base, 3058 bool has_base_node, const char *base_node, 3059 bool has_backing_file, const char *backing_file, 3060 bool has_speed, int64_t speed, 3061 bool has_on_error, BlockdevOnError on_error, 3062 Error **errp) 3063 { 3064 BlockDriverState *bs, *iter; 3065 BlockDriverState *base_bs = NULL; 3066 AioContext *aio_context; 3067 Error *local_err = NULL; 3068 const char *base_name = NULL; 3069 3070 if (!has_on_error) { 3071 on_error = BLOCKDEV_ON_ERROR_REPORT; 3072 } 3073 3074 bs = bdrv_lookup_bs(device, device, errp); 3075 if (!bs) { 3076 return; 3077 } 3078 3079 aio_context = bdrv_get_aio_context(bs); 3080 aio_context_acquire(aio_context); 3081 3082 if (has_base && has_base_node) { 3083 error_setg(errp, "'base' and 'base-node' cannot be specified " 3084 "at the same time"); 3085 goto out; 3086 } 3087 3088 if (has_base) { 3089 base_bs = bdrv_find_backing_image(bs, base); 3090 if (base_bs == NULL) { 3091 error_setg(errp, QERR_BASE_NOT_FOUND, base); 3092 goto out; 3093 } 3094 assert(bdrv_get_aio_context(base_bs) == aio_context); 3095 base_name = base; 3096 } 3097 3098 if (has_base_node) { 3099 base_bs = bdrv_lookup_bs(NULL, base_node, errp); 3100 if (!base_bs) { 3101 goto out; 3102 } 3103 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { 3104 error_setg(errp, "Node '%s' is not a backing image of '%s'", 3105 base_node, device); 3106 goto out; 3107 } 3108 assert(bdrv_get_aio_context(base_bs) == aio_context); 3109 base_name = base_bs->filename; 3110 } 3111 3112 /* Check for op blockers in the whole chain between bs and base */ 3113 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) { 3114 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { 3115 goto out; 3116 } 3117 } 3118 3119 /* if we are streaming the entire chain, the result will have no backing 3120 * file, and specifying one is therefore an error */ 3121 if (base_bs == NULL && has_backing_file) { 3122 error_setg(errp, "backing file specified, but streaming the " 3123 "entire chain"); 3124 goto out; 3125 } 3126 3127 /* backing_file string overrides base bs filename */ 3128 base_name = has_backing_file ? backing_file : base_name; 3129 3130 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name, 3131 has_speed ? speed : 0, on_error, &local_err); 3132 if (local_err) { 3133 error_propagate(errp, local_err); 3134 goto out; 3135 } 3136 3137 trace_qmp_block_stream(bs, bs->job); 3138 3139 out: 3140 aio_context_release(aio_context); 3141 } 3142 3143 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, 3144 bool has_base, const char *base, 3145 bool has_top, const char *top, 3146 bool has_backing_file, const char *backing_file, 3147 bool has_speed, int64_t speed, 3148 bool has_filter_node_name, const char *filter_node_name, 3149 Error **errp) 3150 { 3151 BlockDriverState *bs; 3152 BlockDriverState *iter; 3153 BlockDriverState *base_bs, *top_bs; 3154 AioContext *aio_context; 3155 Error *local_err = NULL; 3156 /* This will be part of the QMP command, if/when the 3157 * BlockdevOnError change for blkmirror makes it in 3158 */ 3159 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 3160 3161 if (!has_speed) { 3162 speed = 0; 3163 } 3164 if (!has_filter_node_name) { 3165 filter_node_name = NULL; 3166 } 3167 3168 /* Important Note: 3169 * libvirt relies on the DeviceNotFound error class in order to probe for 3170 * live commit feature versions; for this to work, we must make sure to 3171 * perform the device lookup before any generic errors that may occur in a 3172 * scenario in which all optional arguments are omitted. */ 3173 bs = qmp_get_root_bs(device, &local_err); 3174 if (!bs) { 3175 bs = bdrv_lookup_bs(device, device, NULL); 3176 if (!bs) { 3177 error_free(local_err); 3178 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 3179 "Device '%s' not found", device); 3180 } else { 3181 error_propagate(errp, local_err); 3182 } 3183 return; 3184 } 3185 3186 aio_context = bdrv_get_aio_context(bs); 3187 aio_context_acquire(aio_context); 3188 3189 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 3190 goto out; 3191 } 3192 3193 /* default top_bs is the active layer */ 3194 top_bs = bs; 3195 3196 if (has_top && top) { 3197 if (strcmp(bs->filename, top) != 0) { 3198 top_bs = bdrv_find_backing_image(bs, top); 3199 } 3200 } 3201 3202 if (top_bs == NULL) { 3203 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 3204 goto out; 3205 } 3206 3207 assert(bdrv_get_aio_context(top_bs) == aio_context); 3208 3209 if (has_base && base) { 3210 base_bs = bdrv_find_backing_image(top_bs, base); 3211 } else { 3212 base_bs = bdrv_find_base(top_bs); 3213 } 3214 3215 if (base_bs == NULL) { 3216 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 3217 goto out; 3218 } 3219 3220 assert(bdrv_get_aio_context(base_bs) == aio_context); 3221 3222 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) { 3223 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3224 goto out; 3225 } 3226 } 3227 3228 /* Do not allow attempts to commit an image into itself */ 3229 if (top_bs == base_bs) { 3230 error_setg(errp, "cannot commit an image into itself"); 3231 goto out; 3232 } 3233 3234 if (top_bs == bs) { 3235 if (has_backing_file) { 3236 error_setg(errp, "'backing-file' specified," 3237 " but 'top' is the active layer"); 3238 goto out; 3239 } 3240 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, 3241 BLOCK_JOB_DEFAULT, speed, on_error, 3242 filter_node_name, NULL, NULL, false, &local_err); 3243 } else { 3244 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); 3245 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 3246 goto out; 3247 } 3248 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed, 3249 on_error, has_backing_file ? backing_file : NULL, 3250 filter_node_name, &local_err); 3251 } 3252 if (local_err != NULL) { 3253 error_propagate(errp, local_err); 3254 goto out; 3255 } 3256 3257 out: 3258 aio_context_release(aio_context); 3259 } 3260 3261 static BlockJob *do_drive_backup(DriveBackup *backup, BlockJobTxn *txn, 3262 Error **errp) 3263 { 3264 BlockDriverState *bs; 3265 BlockDriverState *target_bs; 3266 BlockDriverState *source = NULL; 3267 BlockJob *job = NULL; 3268 BdrvDirtyBitmap *bmap = NULL; 3269 AioContext *aio_context; 3270 QDict *options = NULL; 3271 Error *local_err = NULL; 3272 int flags; 3273 int64_t size; 3274 bool set_backing_hd = false; 3275 3276 if (!backup->has_speed) { 3277 backup->speed = 0; 3278 } 3279 if (!backup->has_on_source_error) { 3280 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3281 } 3282 if (!backup->has_on_target_error) { 3283 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3284 } 3285 if (!backup->has_mode) { 3286 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3287 } 3288 if (!backup->has_job_id) { 3289 backup->job_id = NULL; 3290 } 3291 if (!backup->has_compress) { 3292 backup->compress = false; 3293 } 3294 3295 bs = qmp_get_root_bs(backup->device, errp); 3296 if (!bs) { 3297 return NULL; 3298 } 3299 3300 aio_context = bdrv_get_aio_context(bs); 3301 aio_context_acquire(aio_context); 3302 3303 if (!backup->has_format) { 3304 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? 3305 NULL : (char*) bs->drv->format_name; 3306 } 3307 3308 /* Early check to avoid creating target */ 3309 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 3310 goto out; 3311 } 3312 3313 flags = bs->open_flags | BDRV_O_RDWR; 3314 3315 /* See if we have a backing HD we can use to create our new image 3316 * on top of. */ 3317 if (backup->sync == MIRROR_SYNC_MODE_TOP) { 3318 source = backing_bs(bs); 3319 if (!source) { 3320 backup->sync = MIRROR_SYNC_MODE_FULL; 3321 } 3322 } 3323 if (backup->sync == MIRROR_SYNC_MODE_NONE) { 3324 source = bs; 3325 flags |= BDRV_O_NO_BACKING; 3326 set_backing_hd = true; 3327 } 3328 3329 size = bdrv_getlength(bs); 3330 if (size < 0) { 3331 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3332 goto out; 3333 } 3334 3335 if (backup->mode != NEW_IMAGE_MODE_EXISTING) { 3336 assert(backup->format); 3337 if (source) { 3338 bdrv_img_create(backup->target, backup->format, source->filename, 3339 source->drv->format_name, NULL, 3340 size, flags, false, &local_err); 3341 } else { 3342 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, 3343 size, flags, false, &local_err); 3344 } 3345 } 3346 3347 if (local_err) { 3348 error_propagate(errp, local_err); 3349 goto out; 3350 } 3351 3352 if (backup->format) { 3353 if (!options) { 3354 options = qdict_new(); 3355 } 3356 qdict_put_str(options, "driver", backup->format); 3357 } 3358 3359 target_bs = bdrv_open(backup->target, NULL, options, flags, errp); 3360 if (!target_bs) { 3361 goto out; 3362 } 3363 3364 bdrv_set_aio_context(target_bs, aio_context); 3365 3366 if (set_backing_hd) { 3367 bdrv_set_backing_hd(target_bs, source, &local_err); 3368 if (local_err) { 3369 bdrv_unref(target_bs); 3370 goto out; 3371 } 3372 } 3373 3374 if (backup->has_bitmap) { 3375 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); 3376 if (!bmap) { 3377 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); 3378 bdrv_unref(target_bs); 3379 goto out; 3380 } 3381 } 3382 3383 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3384 backup->sync, bmap, backup->compress, 3385 backup->on_source_error, backup->on_target_error, 3386 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err); 3387 bdrv_unref(target_bs); 3388 if (local_err != NULL) { 3389 error_propagate(errp, local_err); 3390 goto out; 3391 } 3392 3393 out: 3394 aio_context_release(aio_context); 3395 return job; 3396 } 3397 3398 void qmp_drive_backup(DriveBackup *arg, Error **errp) 3399 { 3400 3401 BlockJob *job; 3402 job = do_drive_backup(arg, NULL, errp); 3403 if (job) { 3404 block_job_start(job); 3405 } 3406 } 3407 3408 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 3409 { 3410 return bdrv_named_nodes_list(errp); 3411 } 3412 3413 BlockJob *do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, 3414 Error **errp) 3415 { 3416 BlockDriverState *bs; 3417 BlockDriverState *target_bs; 3418 Error *local_err = NULL; 3419 AioContext *aio_context; 3420 BlockJob *job = NULL; 3421 3422 if (!backup->has_speed) { 3423 backup->speed = 0; 3424 } 3425 if (!backup->has_on_source_error) { 3426 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3427 } 3428 if (!backup->has_on_target_error) { 3429 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3430 } 3431 if (!backup->has_job_id) { 3432 backup->job_id = NULL; 3433 } 3434 if (!backup->has_compress) { 3435 backup->compress = false; 3436 } 3437 3438 bs = qmp_get_root_bs(backup->device, errp); 3439 if (!bs) { 3440 return NULL; 3441 } 3442 3443 aio_context = bdrv_get_aio_context(bs); 3444 aio_context_acquire(aio_context); 3445 3446 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); 3447 if (!target_bs) { 3448 goto out; 3449 } 3450 3451 if (bdrv_get_aio_context(target_bs) != aio_context) { 3452 if (!bdrv_has_blk(target_bs)) { 3453 /* The target BDS is not attached, we can safely move it to another 3454 * AioContext. */ 3455 bdrv_set_aio_context(target_bs, aio_context); 3456 } else { 3457 error_setg(errp, "Target is attached to a different thread from " 3458 "source."); 3459 goto out; 3460 } 3461 } 3462 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, 3463 backup->sync, NULL, backup->compress, 3464 backup->on_source_error, backup->on_target_error, 3465 BLOCK_JOB_DEFAULT, NULL, NULL, txn, &local_err); 3466 if (local_err != NULL) { 3467 error_propagate(errp, local_err); 3468 } 3469 out: 3470 aio_context_release(aio_context); 3471 return job; 3472 } 3473 3474 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp) 3475 { 3476 BlockJob *job; 3477 job = do_blockdev_backup(arg, NULL, errp); 3478 if (job) { 3479 block_job_start(job); 3480 } 3481 } 3482 3483 /* Parameter check and block job starting for drive mirroring. 3484 * Caller should hold @device and @target's aio context (must be the same). 3485 **/ 3486 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, 3487 BlockDriverState *target, 3488 bool has_replaces, const char *replaces, 3489 enum MirrorSyncMode sync, 3490 BlockMirrorBackingMode backing_mode, 3491 bool has_speed, int64_t speed, 3492 bool has_granularity, uint32_t granularity, 3493 bool has_buf_size, int64_t buf_size, 3494 bool has_on_source_error, 3495 BlockdevOnError on_source_error, 3496 bool has_on_target_error, 3497 BlockdevOnError on_target_error, 3498 bool has_unmap, bool unmap, 3499 bool has_filter_node_name, 3500 const char *filter_node_name, 3501 Error **errp) 3502 { 3503 3504 if (!has_speed) { 3505 speed = 0; 3506 } 3507 if (!has_on_source_error) { 3508 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 3509 } 3510 if (!has_on_target_error) { 3511 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 3512 } 3513 if (!has_granularity) { 3514 granularity = 0; 3515 } 3516 if (!has_buf_size) { 3517 buf_size = 0; 3518 } 3519 if (!has_unmap) { 3520 unmap = true; 3521 } 3522 if (!has_filter_node_name) { 3523 filter_node_name = NULL; 3524 } 3525 3526 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 3527 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3528 "a value in range [512B, 64MB]"); 3529 return; 3530 } 3531 if (granularity & (granularity - 1)) { 3532 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 3533 "power of 2"); 3534 return; 3535 } 3536 3537 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { 3538 return; 3539 } 3540 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { 3541 return; 3542 } 3543 3544 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) { 3545 sync = MIRROR_SYNC_MODE_FULL; 3546 } 3547 3548 /* pass the node name to replace to mirror start since it's loose coupling 3549 * and will allow to check whether the node still exist at mirror completion 3550 */ 3551 mirror_start(job_id, bs, target, 3552 has_replaces ? replaces : NULL, 3553 speed, granularity, buf_size, sync, backing_mode, 3554 on_source_error, on_target_error, unmap, filter_node_name, 3555 errp); 3556 } 3557 3558 void qmp_drive_mirror(DriveMirror *arg, Error **errp) 3559 { 3560 BlockDriverState *bs; 3561 BlockDriverState *source, *target_bs; 3562 AioContext *aio_context; 3563 BlockMirrorBackingMode backing_mode; 3564 Error *local_err = NULL; 3565 QDict *options = NULL; 3566 int flags; 3567 int64_t size; 3568 const char *format = arg->format; 3569 3570 bs = qmp_get_root_bs(arg->device, errp); 3571 if (!bs) { 3572 return; 3573 } 3574 3575 aio_context = bdrv_get_aio_context(bs); 3576 aio_context_acquire(aio_context); 3577 3578 if (!arg->has_mode) { 3579 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 3580 } 3581 3582 if (!arg->has_format) { 3583 format = (arg->mode == NEW_IMAGE_MODE_EXISTING 3584 ? NULL : bs->drv->format_name); 3585 } 3586 3587 flags = bs->open_flags | BDRV_O_RDWR; 3588 source = backing_bs(bs); 3589 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) { 3590 arg->sync = MIRROR_SYNC_MODE_FULL; 3591 } 3592 if (arg->sync == MIRROR_SYNC_MODE_NONE) { 3593 source = bs; 3594 } 3595 3596 size = bdrv_getlength(bs); 3597 if (size < 0) { 3598 error_setg_errno(errp, -size, "bdrv_getlength failed"); 3599 goto out; 3600 } 3601 3602 if (arg->has_replaces) { 3603 BlockDriverState *to_replace_bs; 3604 AioContext *replace_aio_context; 3605 int64_t replace_size; 3606 3607 if (!arg->has_node_name) { 3608 error_setg(errp, "a node-name must be provided when replacing a" 3609 " named node of the graph"); 3610 goto out; 3611 } 3612 3613 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err); 3614 3615 if (!to_replace_bs) { 3616 error_propagate(errp, local_err); 3617 goto out; 3618 } 3619 3620 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 3621 aio_context_acquire(replace_aio_context); 3622 replace_size = bdrv_getlength(to_replace_bs); 3623 aio_context_release(replace_aio_context); 3624 3625 if (size != replace_size) { 3626 error_setg(errp, "cannot replace image with a mirror image of " 3627 "different size"); 3628 goto out; 3629 } 3630 } 3631 3632 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { 3633 backing_mode = MIRROR_SOURCE_BACKING_CHAIN; 3634 } else { 3635 backing_mode = MIRROR_OPEN_BACKING_CHAIN; 3636 } 3637 3638 /* Don't open backing image in create() */ 3639 flags |= BDRV_O_NO_BACKING; 3640 3641 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source) 3642 && arg->mode != NEW_IMAGE_MODE_EXISTING) 3643 { 3644 /* create new image w/o backing file */ 3645 assert(format); 3646 bdrv_img_create(arg->target, format, 3647 NULL, NULL, NULL, size, flags, false, &local_err); 3648 } else { 3649 switch (arg->mode) { 3650 case NEW_IMAGE_MODE_EXISTING: 3651 break; 3652 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 3653 /* create new image with backing file */ 3654 bdrv_img_create(arg->target, format, 3655 source->filename, 3656 source->drv->format_name, 3657 NULL, size, flags, false, &local_err); 3658 break; 3659 default: 3660 abort(); 3661 } 3662 } 3663 3664 if (local_err) { 3665 error_propagate(errp, local_err); 3666 goto out; 3667 } 3668 3669 options = qdict_new(); 3670 if (arg->has_node_name) { 3671 qdict_put_str(options, "node-name", arg->node_name); 3672 } 3673 if (format) { 3674 qdict_put_str(options, "driver", format); 3675 } 3676 3677 /* Mirroring takes care of copy-on-write using the source's backing 3678 * file. 3679 */ 3680 target_bs = bdrv_open(arg->target, NULL, options, flags, errp); 3681 if (!target_bs) { 3682 goto out; 3683 } 3684 3685 bdrv_set_aio_context(target_bs, aio_context); 3686 3687 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, 3688 arg->has_replaces, arg->replaces, arg->sync, 3689 backing_mode, arg->has_speed, arg->speed, 3690 arg->has_granularity, arg->granularity, 3691 arg->has_buf_size, arg->buf_size, 3692 arg->has_on_source_error, arg->on_source_error, 3693 arg->has_on_target_error, arg->on_target_error, 3694 arg->has_unmap, arg->unmap, 3695 false, NULL, 3696 &local_err); 3697 bdrv_unref(target_bs); 3698 error_propagate(errp, local_err); 3699 out: 3700 aio_context_release(aio_context); 3701 } 3702 3703 void qmp_blockdev_mirror(bool has_job_id, const char *job_id, 3704 const char *device, const char *target, 3705 bool has_replaces, const char *replaces, 3706 MirrorSyncMode sync, 3707 bool has_speed, int64_t speed, 3708 bool has_granularity, uint32_t granularity, 3709 bool has_buf_size, int64_t buf_size, 3710 bool has_on_source_error, 3711 BlockdevOnError on_source_error, 3712 bool has_on_target_error, 3713 BlockdevOnError on_target_error, 3714 bool has_filter_node_name, 3715 const char *filter_node_name, 3716 Error **errp) 3717 { 3718 BlockDriverState *bs; 3719 BlockDriverState *target_bs; 3720 AioContext *aio_context; 3721 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; 3722 Error *local_err = NULL; 3723 3724 bs = qmp_get_root_bs(device, errp); 3725 if (!bs) { 3726 return; 3727 } 3728 3729 target_bs = bdrv_lookup_bs(target, target, errp); 3730 if (!target_bs) { 3731 return; 3732 } 3733 3734 aio_context = bdrv_get_aio_context(bs); 3735 aio_context_acquire(aio_context); 3736 3737 bdrv_set_aio_context(target_bs, aio_context); 3738 3739 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, 3740 has_replaces, replaces, sync, backing_mode, 3741 has_speed, speed, 3742 has_granularity, granularity, 3743 has_buf_size, buf_size, 3744 has_on_source_error, on_source_error, 3745 has_on_target_error, on_target_error, 3746 true, true, 3747 has_filter_node_name, filter_node_name, 3748 &local_err); 3749 error_propagate(errp, local_err); 3750 3751 aio_context_release(aio_context); 3752 } 3753 3754 /* Get a block job using its ID and acquire its AioContext */ 3755 static BlockJob *find_block_job(const char *id, AioContext **aio_context, 3756 Error **errp) 3757 { 3758 BlockJob *job; 3759 3760 assert(id != NULL); 3761 3762 *aio_context = NULL; 3763 3764 job = block_job_get(id); 3765 3766 if (!job) { 3767 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 3768 "Block job '%s' not found", id); 3769 return NULL; 3770 } 3771 3772 *aio_context = blk_get_aio_context(job->blk); 3773 aio_context_acquire(*aio_context); 3774 3775 return job; 3776 } 3777 3778 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 3779 { 3780 AioContext *aio_context; 3781 BlockJob *job = find_block_job(device, &aio_context, errp); 3782 3783 if (!job) { 3784 return; 3785 } 3786 3787 block_job_set_speed(job, speed, errp); 3788 aio_context_release(aio_context); 3789 } 3790 3791 void qmp_block_job_cancel(const char *device, 3792 bool has_force, bool force, Error **errp) 3793 { 3794 AioContext *aio_context; 3795 BlockJob *job = find_block_job(device, &aio_context, errp); 3796 3797 if (!job) { 3798 return; 3799 } 3800 3801 if (!has_force) { 3802 force = false; 3803 } 3804 3805 if (block_job_user_paused(job) && !force) { 3806 error_setg(errp, "The block job for device '%s' is currently paused", 3807 device); 3808 goto out; 3809 } 3810 3811 trace_qmp_block_job_cancel(job); 3812 block_job_cancel(job); 3813 out: 3814 aio_context_release(aio_context); 3815 } 3816 3817 void qmp_block_job_pause(const char *device, Error **errp) 3818 { 3819 AioContext *aio_context; 3820 BlockJob *job = find_block_job(device, &aio_context, errp); 3821 3822 if (!job || block_job_user_paused(job)) { 3823 return; 3824 } 3825 3826 trace_qmp_block_job_pause(job); 3827 block_job_user_pause(job); 3828 aio_context_release(aio_context); 3829 } 3830 3831 void qmp_block_job_resume(const char *device, Error **errp) 3832 { 3833 AioContext *aio_context; 3834 BlockJob *job = find_block_job(device, &aio_context, errp); 3835 3836 if (!job || !block_job_user_paused(job)) { 3837 return; 3838 } 3839 3840 trace_qmp_block_job_resume(job); 3841 block_job_user_resume(job); 3842 aio_context_release(aio_context); 3843 } 3844 3845 void qmp_block_job_complete(const char *device, Error **errp) 3846 { 3847 AioContext *aio_context; 3848 BlockJob *job = find_block_job(device, &aio_context, errp); 3849 3850 if (!job) { 3851 return; 3852 } 3853 3854 trace_qmp_block_job_complete(job); 3855 block_job_complete(job, errp); 3856 aio_context_release(aio_context); 3857 } 3858 3859 void qmp_change_backing_file(const char *device, 3860 const char *image_node_name, 3861 const char *backing_file, 3862 Error **errp) 3863 { 3864 BlockDriverState *bs = NULL; 3865 AioContext *aio_context; 3866 BlockDriverState *image_bs = NULL; 3867 Error *local_err = NULL; 3868 bool ro; 3869 int open_flags; 3870 int ret; 3871 3872 bs = qmp_get_root_bs(device, errp); 3873 if (!bs) { 3874 return; 3875 } 3876 3877 aio_context = bdrv_get_aio_context(bs); 3878 aio_context_acquire(aio_context); 3879 3880 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 3881 if (local_err) { 3882 error_propagate(errp, local_err); 3883 goto out; 3884 } 3885 3886 if (!image_bs) { 3887 error_setg(errp, "image file not found"); 3888 goto out; 3889 } 3890 3891 if (bdrv_find_base(image_bs) == image_bs) { 3892 error_setg(errp, "not allowing backing file change on an image " 3893 "without a backing file"); 3894 goto out; 3895 } 3896 3897 /* even though we are not necessarily operating on bs, we need it to 3898 * determine if block ops are currently prohibited on the chain */ 3899 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3900 goto out; 3901 } 3902 3903 /* final sanity check */ 3904 if (!bdrv_chain_contains(bs, image_bs)) { 3905 error_setg(errp, "'%s' and image file are not in the same chain", 3906 device); 3907 goto out; 3908 } 3909 3910 /* if not r/w, reopen to make r/w */ 3911 open_flags = image_bs->open_flags; 3912 ro = bdrv_is_read_only(image_bs); 3913 3914 if (ro) { 3915 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3916 if (local_err) { 3917 error_propagate(errp, local_err); 3918 goto out; 3919 } 3920 } 3921 3922 ret = bdrv_change_backing_file(image_bs, backing_file, 3923 image_bs->drv ? image_bs->drv->format_name : ""); 3924 3925 if (ret < 0) { 3926 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3927 backing_file); 3928 /* don't exit here, so we can try to restore open flags if 3929 * appropriate */ 3930 } 3931 3932 if (ro) { 3933 bdrv_reopen(image_bs, open_flags, &local_err); 3934 error_propagate(errp, local_err); 3935 } 3936 3937 out: 3938 aio_context_release(aio_context); 3939 } 3940 3941 void hmp_drive_add_node(Monitor *mon, const char *optstr) 3942 { 3943 QemuOpts *opts; 3944 QDict *qdict; 3945 Error *local_err = NULL; 3946 3947 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false); 3948 if (!opts) { 3949 return; 3950 } 3951 3952 qdict = qemu_opts_to_qdict(opts, NULL); 3953 3954 if (!qdict_get_try_str(qdict, "node-name")) { 3955 QDECREF(qdict); 3956 error_report("'node-name' needs to be specified"); 3957 goto out; 3958 } 3959 3960 BlockDriverState *bs = bds_tree_init(qdict, &local_err); 3961 if (!bs) { 3962 error_report_err(local_err); 3963 goto out; 3964 } 3965 3966 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 3967 3968 out: 3969 qemu_opts_del(opts); 3970 } 3971 3972 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3973 { 3974 BlockDriverState *bs; 3975 QObject *obj; 3976 Visitor *v = qobject_output_visitor_new(&obj); 3977 QDict *qdict; 3978 const QDictEntry *ent; 3979 Error *local_err = NULL; 3980 3981 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 3982 if (local_err) { 3983 error_propagate(errp, local_err); 3984 goto fail; 3985 } 3986 3987 visit_complete(v, &obj); 3988 qdict = qobject_to_qdict(obj); 3989 3990 qdict_flatten(qdict); 3991 3992 /* 3993 * Rewrite "backing": null to "backing": "" 3994 * TODO Rewrite "" to null instead, and perhaps not even here 3995 */ 3996 for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) { 3997 char *dot = strrchr(ent->key, '.'); 3998 3999 if (!strcmp(dot ? dot + 1 : ent->key, "backing") 4000 && qobject_type(ent->value) == QTYPE_QNULL) { 4001 qdict_put(qdict, ent->key, qstring_new()); 4002 } 4003 } 4004 4005 if (!qdict_get_try_str(qdict, "node-name")) { 4006 error_setg(errp, "'node-name' must be specified for the root node"); 4007 goto fail; 4008 } 4009 4010 bs = bds_tree_init(qdict, errp); 4011 if (!bs) { 4012 goto fail; 4013 } 4014 4015 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); 4016 4017 fail: 4018 visit_free(v); 4019 } 4020 4021 void qmp_blockdev_del(const char *node_name, Error **errp) 4022 { 4023 AioContext *aio_context; 4024 BlockDriverState *bs; 4025 4026 bs = bdrv_find_node(node_name); 4027 if (!bs) { 4028 error_setg(errp, "Cannot find node %s", node_name); 4029 return; 4030 } 4031 if (bdrv_has_blk(bs)) { 4032 error_setg(errp, "Node %s is in use", node_name); 4033 return; 4034 } 4035 aio_context = bdrv_get_aio_context(bs); 4036 aio_context_acquire(aio_context); 4037 4038 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { 4039 goto out; 4040 } 4041 4042 if (!bs->monitor_list.tqe_prev) { 4043 error_setg(errp, "Node %s is not owned by the monitor", 4044 bs->node_name); 4045 goto out; 4046 } 4047 4048 if (bs->refcnt > 1) { 4049 error_setg(errp, "Block device %s is in use", 4050 bdrv_get_device_or_node_name(bs)); 4051 goto out; 4052 } 4053 4054 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); 4055 bdrv_unref(bs); 4056 4057 out: 4058 aio_context_release(aio_context); 4059 } 4060 4061 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, 4062 const char *child_name) 4063 { 4064 BdrvChild *child; 4065 4066 QLIST_FOREACH(child, &parent_bs->children, next) { 4067 if (strcmp(child->name, child_name) == 0) { 4068 return child; 4069 } 4070 } 4071 4072 return NULL; 4073 } 4074 4075 void qmp_x_blockdev_change(const char *parent, bool has_child, 4076 const char *child, bool has_node, 4077 const char *node, Error **errp) 4078 { 4079 BlockDriverState *parent_bs, *new_bs = NULL; 4080 BdrvChild *p_child; 4081 4082 parent_bs = bdrv_lookup_bs(parent, parent, errp); 4083 if (!parent_bs) { 4084 return; 4085 } 4086 4087 if (has_child == has_node) { 4088 if (has_child) { 4089 error_setg(errp, "The parameters child and node are in conflict"); 4090 } else { 4091 error_setg(errp, "Either child or node must be specified"); 4092 } 4093 return; 4094 } 4095 4096 if (has_child) { 4097 p_child = bdrv_find_child(parent_bs, child); 4098 if (!p_child) { 4099 error_setg(errp, "Node '%s' does not have child '%s'", 4100 parent, child); 4101 return; 4102 } 4103 bdrv_del_child(parent_bs, p_child, errp); 4104 } 4105 4106 if (has_node) { 4107 new_bs = bdrv_find_node(node); 4108 if (!new_bs) { 4109 error_setg(errp, "Node '%s' not found", node); 4110 return; 4111 } 4112 bdrv_add_child(parent_bs, new_bs, errp); 4113 } 4114 } 4115 4116 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 4117 { 4118 BlockJobInfoList *head = NULL, **p_next = &head; 4119 BlockJob *job; 4120 4121 for (job = block_job_next(NULL); job; job = block_job_next(job)) { 4122 BlockJobInfoList *elem; 4123 AioContext *aio_context; 4124 4125 if (block_job_is_internal(job)) { 4126 continue; 4127 } 4128 elem = g_new0(BlockJobInfoList, 1); 4129 aio_context = blk_get_aio_context(job->blk); 4130 aio_context_acquire(aio_context); 4131 elem->value = block_job_query(job, errp); 4132 aio_context_release(aio_context); 4133 if (!elem->value) { 4134 g_free(elem); 4135 qapi_free_BlockJobInfoList(head); 4136 return NULL; 4137 } 4138 *p_next = elem; 4139 p_next = &elem->next; 4140 } 4141 4142 return head; 4143 } 4144 4145 QemuOptsList qemu_common_drive_opts = { 4146 .name = "drive", 4147 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 4148 .desc = { 4149 { 4150 .name = "snapshot", 4151 .type = QEMU_OPT_BOOL, 4152 .help = "enable/disable snapshot mode", 4153 },{ 4154 .name = "aio", 4155 .type = QEMU_OPT_STRING, 4156 .help = "host AIO implementation (threads, native)", 4157 },{ 4158 .name = BDRV_OPT_CACHE_WB, 4159 .type = QEMU_OPT_BOOL, 4160 .help = "Enable writeback mode", 4161 },{ 4162 .name = "format", 4163 .type = QEMU_OPT_STRING, 4164 .help = "disk format (raw, qcow2, ...)", 4165 },{ 4166 .name = "rerror", 4167 .type = QEMU_OPT_STRING, 4168 .help = "read error action", 4169 },{ 4170 .name = "werror", 4171 .type = QEMU_OPT_STRING, 4172 .help = "write error action", 4173 },{ 4174 .name = BDRV_OPT_READ_ONLY, 4175 .type = QEMU_OPT_BOOL, 4176 .help = "open drive file as read-only", 4177 }, 4178 4179 THROTTLE_OPTS, 4180 4181 { 4182 .name = "throttling.group", 4183 .type = QEMU_OPT_STRING, 4184 .help = "name of the block throttling group", 4185 },{ 4186 .name = "copy-on-read", 4187 .type = QEMU_OPT_BOOL, 4188 .help = "copy read data from backing file into image file", 4189 },{ 4190 .name = "detect-zeroes", 4191 .type = QEMU_OPT_STRING, 4192 .help = "try to optimize zero writes (off, on, unmap)", 4193 },{ 4194 .name = "stats-account-invalid", 4195 .type = QEMU_OPT_BOOL, 4196 .help = "whether to account for invalid I/O operations " 4197 "in the statistics", 4198 },{ 4199 .name = "stats-account-failed", 4200 .type = QEMU_OPT_BOOL, 4201 .help = "whether to account for failed I/O operations " 4202 "in the statistics", 4203 }, 4204 { /* end of list */ } 4205 }, 4206 }; 4207 4208 QemuOptsList qemu_drive_opts = { 4209 .name = "drive", 4210 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 4211 .desc = { 4212 /* 4213 * no elements => accept any params 4214 * validation will happen later 4215 */ 4216 { /* end of list */ } 4217 }, 4218 }; 4219