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 "sysemu/block-backend.h" 34 #include "sysemu/blockdev.h" 35 #include "hw/block/block.h" 36 #include "block/blockjob.h" 37 #include "monitor/monitor.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "qapi-visit.h" 42 #include "qapi/qmp-output-visitor.h" 43 #include "qapi/util.h" 44 #include "sysemu/sysemu.h" 45 #include "block/block_int.h" 46 #include "qmp-commands.h" 47 #include "trace.h" 48 #include "sysemu/arch_init.h" 49 50 static const char *const if_name[IF_COUNT] = { 51 [IF_NONE] = "none", 52 [IF_IDE] = "ide", 53 [IF_SCSI] = "scsi", 54 [IF_FLOPPY] = "floppy", 55 [IF_PFLASH] = "pflash", 56 [IF_MTD] = "mtd", 57 [IF_SD] = "sd", 58 [IF_VIRTIO] = "virtio", 59 [IF_XEN] = "xen", 60 }; 61 62 static int if_max_devs[IF_COUNT] = { 63 /* 64 * Do not change these numbers! They govern how drive option 65 * index maps to unit and bus. That mapping is ABI. 66 * 67 * All controllers used to imlement if=T drives need to support 68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 69 * Otherwise, some index values map to "impossible" bus, unit 70 * values. 71 * 72 * For instance, if you change [IF_SCSI] to 255, -drive 73 * if=scsi,index=12 no longer means bus=1,unit=5, but 74 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 75 * the drive can't be set up. Regression. 76 */ 77 [IF_IDE] = 2, 78 [IF_SCSI] = 7, 79 }; 80 81 /** 82 * Boards may call this to offer board-by-board overrides 83 * of the default, global values. 84 */ 85 void override_max_devs(BlockInterfaceType type, int max_devs) 86 { 87 BlockBackend *blk; 88 DriveInfo *dinfo; 89 90 if (max_devs <= 0) { 91 return; 92 } 93 94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 95 dinfo = blk_legacy_dinfo(blk); 96 if (dinfo->type == type) { 97 fprintf(stderr, "Cannot override units-per-bus property of" 98 " the %s interface, because a drive of that type has" 99 " already been added.\n", if_name[type]); 100 g_assert_not_reached(); 101 } 102 } 103 104 if_max_devs[type] = max_devs; 105 } 106 107 /* 108 * We automatically delete the drive when a device using it gets 109 * unplugged. Questionable feature, but we can't just drop it. 110 * Device models call blockdev_mark_auto_del() to schedule the 111 * automatic deletion, and generic qdev code calls blockdev_auto_del() 112 * when deletion is actually safe. 113 */ 114 void blockdev_mark_auto_del(BlockBackend *blk) 115 { 116 DriveInfo *dinfo = blk_legacy_dinfo(blk); 117 BlockDriverState *bs = blk_bs(blk); 118 AioContext *aio_context; 119 120 if (!dinfo) { 121 return; 122 } 123 124 aio_context = bdrv_get_aio_context(bs); 125 aio_context_acquire(aio_context); 126 127 if (bs->job) { 128 block_job_cancel(bs->job); 129 } 130 131 aio_context_release(aio_context); 132 133 dinfo->auto_del = 1; 134 } 135 136 void blockdev_auto_del(BlockBackend *blk) 137 { 138 DriveInfo *dinfo = blk_legacy_dinfo(blk); 139 140 if (dinfo && dinfo->auto_del) { 141 blk_unref(blk); 142 } 143 } 144 145 /** 146 * Returns the current mapping of how many units per bus 147 * a particular interface can support. 148 * 149 * A positive integer indicates n units per bus. 150 * 0 implies the mapping has not been established. 151 * -1 indicates an invalid BlockInterfaceType was given. 152 */ 153 int drive_get_max_devs(BlockInterfaceType type) 154 { 155 if (type >= IF_IDE && type < IF_COUNT) { 156 return if_max_devs[type]; 157 } 158 159 return -1; 160 } 161 162 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 163 { 164 int max_devs = if_max_devs[type]; 165 return max_devs ? index / max_devs : 0; 166 } 167 168 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 169 { 170 int max_devs = if_max_devs[type]; 171 return max_devs ? index % max_devs : index; 172 } 173 174 QemuOpts *drive_def(const char *optstr) 175 { 176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 177 } 178 179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 180 const char *optstr) 181 { 182 QemuOpts *opts; 183 char buf[32]; 184 185 opts = drive_def(optstr); 186 if (!opts) { 187 return NULL; 188 } 189 if (type != IF_DEFAULT) { 190 qemu_opt_set(opts, "if", if_name[type]); 191 } 192 if (index >= 0) { 193 snprintf(buf, sizeof(buf), "%d", index); 194 qemu_opt_set(opts, "index", buf); 195 } 196 if (file) 197 qemu_opt_set(opts, "file", file); 198 return opts; 199 } 200 201 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 202 { 203 BlockBackend *blk; 204 DriveInfo *dinfo; 205 206 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 207 dinfo = blk_legacy_dinfo(blk); 208 if (dinfo && dinfo->type == type 209 && dinfo->bus == bus && dinfo->unit == unit) { 210 return dinfo; 211 } 212 } 213 214 return NULL; 215 } 216 217 bool drive_check_orphaned(void) 218 { 219 BlockBackend *blk; 220 DriveInfo *dinfo; 221 bool rs = false; 222 223 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 224 dinfo = blk_legacy_dinfo(blk); 225 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 226 /* Unless this is a default drive, this may be an oversight. */ 227 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 228 dinfo->type != IF_NONE) { 229 fprintf(stderr, "Warning: Orphaned drive without device: " 230 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 231 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 232 dinfo->bus, dinfo->unit); 233 rs = true; 234 } 235 } 236 237 return rs; 238 } 239 240 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 241 { 242 return drive_get(type, 243 drive_index_to_bus_id(type, index), 244 drive_index_to_unit_id(type, index)); 245 } 246 247 int drive_get_max_bus(BlockInterfaceType type) 248 { 249 int max_bus; 250 BlockBackend *blk; 251 DriveInfo *dinfo; 252 253 max_bus = -1; 254 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 255 dinfo = blk_legacy_dinfo(blk); 256 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 257 max_bus = dinfo->bus; 258 } 259 } 260 return max_bus; 261 } 262 263 /* Get a block device. This should only be used for single-drive devices 264 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 265 appropriate bus. */ 266 DriveInfo *drive_get_next(BlockInterfaceType type) 267 { 268 static int next_block_unit[IF_COUNT]; 269 270 return drive_get(type, 0, next_block_unit[type]++); 271 } 272 273 static void bdrv_format_print(void *opaque, const char *name) 274 { 275 error_printf(" %s", name); 276 } 277 278 typedef struct { 279 QEMUBH *bh; 280 BlockDriverState *bs; 281 } BDRVPutRefBH; 282 283 static void bdrv_put_ref_bh(void *opaque) 284 { 285 BDRVPutRefBH *s = opaque; 286 287 bdrv_unref(s->bs); 288 qemu_bh_delete(s->bh); 289 g_free(s); 290 } 291 292 /* 293 * Release a BDS reference in a BH 294 * 295 * It is not safe to use bdrv_unref() from a callback function when the callers 296 * still need the BlockDriverState. In such cases we schedule a BH to release 297 * the reference. 298 */ 299 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 300 { 301 BDRVPutRefBH *s; 302 303 s = g_new(BDRVPutRefBH, 1); 304 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 305 s->bs = bs; 306 qemu_bh_schedule(s->bh); 307 } 308 309 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 310 { 311 if (!strcmp(buf, "ignore")) { 312 return BLOCKDEV_ON_ERROR_IGNORE; 313 } else if (!is_read && !strcmp(buf, "enospc")) { 314 return BLOCKDEV_ON_ERROR_ENOSPC; 315 } else if (!strcmp(buf, "stop")) { 316 return BLOCKDEV_ON_ERROR_STOP; 317 } else if (!strcmp(buf, "report")) { 318 return BLOCKDEV_ON_ERROR_REPORT; 319 } else { 320 error_setg(errp, "'%s' invalid %s error action", 321 buf, is_read ? "read" : "write"); 322 return -1; 323 } 324 } 325 326 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 327 { 328 if (throttle_conflicting(cfg)) { 329 error_setg(errp, "bps/iops/max total values and read/write values" 330 " cannot be used at the same time"); 331 return false; 332 } 333 334 if (!throttle_is_valid(cfg)) { 335 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 336 return false; 337 } 338 339 return true; 340 } 341 342 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 343 344 /* Takes the ownership of bs_opts */ 345 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 346 Error **errp) 347 { 348 const char *buf; 349 int ro = 0; 350 int bdrv_flags = 0; 351 int on_read_error, on_write_error; 352 BlockBackend *blk; 353 BlockDriverState *bs; 354 ThrottleConfig cfg; 355 int snapshot = 0; 356 bool copy_on_read; 357 Error *error = NULL; 358 QemuOpts *opts; 359 const char *id; 360 bool has_driver_specific_opts; 361 BlockdevDetectZeroesOptions detect_zeroes; 362 363 /* Check common options by copying from bs_opts to opts, all other options 364 * stay in bs_opts for processing by bdrv_open(). */ 365 id = qdict_get_try_str(bs_opts, "id"); 366 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 367 if (error) { 368 error_propagate(errp, error); 369 goto err_no_opts; 370 } 371 372 qemu_opts_absorb_qdict(opts, bs_opts, &error); 373 if (error) { 374 error_propagate(errp, error); 375 goto early_err; 376 } 377 378 if (id) { 379 qdict_del(bs_opts, "id"); 380 } 381 382 has_driver_specific_opts = !!qdict_size(bs_opts); 383 384 /* extract parameters */ 385 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 386 ro = qemu_opt_get_bool(opts, "read-only", 0); 387 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 388 389 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 390 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 391 error_setg(errp, "invalid discard option"); 392 goto early_err; 393 } 394 } 395 396 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 397 bdrv_flags |= BDRV_O_CACHE_WB; 398 } 399 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 400 bdrv_flags |= BDRV_O_NOCACHE; 401 } 402 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 403 bdrv_flags |= BDRV_O_NO_FLUSH; 404 } 405 406 #ifdef CONFIG_LINUX_AIO 407 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 408 if (!strcmp(buf, "native")) { 409 bdrv_flags |= BDRV_O_NATIVE_AIO; 410 } else if (!strcmp(buf, "threads")) { 411 /* this is the default */ 412 } else { 413 error_setg(errp, "invalid aio option"); 414 goto early_err; 415 } 416 } 417 #endif 418 419 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 420 if (is_help_option(buf)) { 421 error_printf("Supported formats:"); 422 bdrv_iterate_format(bdrv_format_print, NULL); 423 error_printf("\n"); 424 goto early_err; 425 } 426 427 if (qdict_haskey(bs_opts, "driver")) { 428 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 429 goto early_err; 430 } 431 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 432 } 433 434 /* disk I/O throttling */ 435 memset(&cfg, 0, sizeof(cfg)); 436 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 437 qemu_opt_get_number(opts, "throttling.bps-total", 0); 438 cfg.buckets[THROTTLE_BPS_READ].avg = 439 qemu_opt_get_number(opts, "throttling.bps-read", 0); 440 cfg.buckets[THROTTLE_BPS_WRITE].avg = 441 qemu_opt_get_number(opts, "throttling.bps-write", 0); 442 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 443 qemu_opt_get_number(opts, "throttling.iops-total", 0); 444 cfg.buckets[THROTTLE_OPS_READ].avg = 445 qemu_opt_get_number(opts, "throttling.iops-read", 0); 446 cfg.buckets[THROTTLE_OPS_WRITE].avg = 447 qemu_opt_get_number(opts, "throttling.iops-write", 0); 448 449 cfg.buckets[THROTTLE_BPS_TOTAL].max = 450 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 451 cfg.buckets[THROTTLE_BPS_READ].max = 452 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 453 cfg.buckets[THROTTLE_BPS_WRITE].max = 454 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 455 cfg.buckets[THROTTLE_OPS_TOTAL].max = 456 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 457 cfg.buckets[THROTTLE_OPS_READ].max = 458 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 459 cfg.buckets[THROTTLE_OPS_WRITE].max = 460 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 461 462 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 463 464 if (!check_throttle_config(&cfg, &error)) { 465 error_propagate(errp, error); 466 goto early_err; 467 } 468 469 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 470 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 471 on_write_error = parse_block_error_action(buf, 0, &error); 472 if (error) { 473 error_propagate(errp, error); 474 goto early_err; 475 } 476 } 477 478 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 479 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 480 on_read_error = parse_block_error_action(buf, 1, &error); 481 if (error) { 482 error_propagate(errp, error); 483 goto early_err; 484 } 485 } 486 487 detect_zeroes = 488 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 489 qemu_opt_get(opts, "detect-zeroes"), 490 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 491 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 492 &error); 493 if (error) { 494 error_propagate(errp, error); 495 goto early_err; 496 } 497 498 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 499 !(bdrv_flags & BDRV_O_UNMAP)) { 500 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 501 "without setting discard operation to unmap"); 502 goto early_err; 503 } 504 505 /* init */ 506 if ((!file || !*file) && !has_driver_specific_opts) { 507 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 508 if (!blk) { 509 goto early_err; 510 } 511 512 bs = blk_bs(blk); 513 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 514 bs->read_only = ro; 515 516 QDECREF(bs_opts); 517 } else { 518 if (file && !*file) { 519 file = NULL; 520 } 521 522 if (snapshot) { 523 /* always use cache=unsafe with snapshot */ 524 bdrv_flags &= ~BDRV_O_CACHE_MASK; 525 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 526 } 527 528 if (copy_on_read) { 529 bdrv_flags |= BDRV_O_COPY_ON_READ; 530 } 531 532 if (runstate_check(RUN_STATE_INMIGRATE)) { 533 bdrv_flags |= BDRV_O_INCOMING; 534 } 535 536 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 537 538 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 539 errp); 540 if (!blk) { 541 goto err_no_bs_opts; 542 } 543 bs = blk_bs(blk); 544 } 545 546 bs->detect_zeroes = detect_zeroes; 547 548 bdrv_set_on_error(bs, on_read_error, on_write_error); 549 550 /* disk I/O throttling */ 551 if (throttle_enabled(&cfg)) { 552 bdrv_io_limits_enable(bs); 553 bdrv_set_io_limits(bs, &cfg); 554 } 555 556 if (bdrv_key_required(bs)) { 557 autostart = 0; 558 } 559 560 err_no_bs_opts: 561 qemu_opts_del(opts); 562 return blk; 563 564 early_err: 565 qemu_opts_del(opts); 566 err_no_opts: 567 QDECREF(bs_opts); 568 return NULL; 569 } 570 571 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 572 Error **errp) 573 { 574 const char *value; 575 576 value = qemu_opt_get(opts, from); 577 if (value) { 578 if (qemu_opt_find(opts, to)) { 579 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 580 "same time", to, from); 581 return; 582 } 583 } 584 585 /* rename all items in opts */ 586 while ((value = qemu_opt_get(opts, from))) { 587 qemu_opt_set(opts, to, value); 588 qemu_opt_unset(opts, from); 589 } 590 } 591 592 QemuOptsList qemu_legacy_drive_opts = { 593 .name = "drive", 594 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 595 .desc = { 596 { 597 .name = "bus", 598 .type = QEMU_OPT_NUMBER, 599 .help = "bus number", 600 },{ 601 .name = "unit", 602 .type = QEMU_OPT_NUMBER, 603 .help = "unit number (i.e. lun for scsi)", 604 },{ 605 .name = "index", 606 .type = QEMU_OPT_NUMBER, 607 .help = "index number", 608 },{ 609 .name = "media", 610 .type = QEMU_OPT_STRING, 611 .help = "media type (disk, cdrom)", 612 },{ 613 .name = "if", 614 .type = QEMU_OPT_STRING, 615 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 616 },{ 617 .name = "cyls", 618 .type = QEMU_OPT_NUMBER, 619 .help = "number of cylinders (ide disk geometry)", 620 },{ 621 .name = "heads", 622 .type = QEMU_OPT_NUMBER, 623 .help = "number of heads (ide disk geometry)", 624 },{ 625 .name = "secs", 626 .type = QEMU_OPT_NUMBER, 627 .help = "number of sectors (ide disk geometry)", 628 },{ 629 .name = "trans", 630 .type = QEMU_OPT_STRING, 631 .help = "chs translation (auto, lba, none)", 632 },{ 633 .name = "boot", 634 .type = QEMU_OPT_BOOL, 635 .help = "(deprecated, ignored)", 636 },{ 637 .name = "addr", 638 .type = QEMU_OPT_STRING, 639 .help = "pci address (virtio only)", 640 },{ 641 .name = "serial", 642 .type = QEMU_OPT_STRING, 643 .help = "disk serial number", 644 },{ 645 .name = "file", 646 .type = QEMU_OPT_STRING, 647 .help = "file name", 648 }, 649 650 /* Options that are passed on, but have special semantics with -drive */ 651 { 652 .name = "read-only", 653 .type = QEMU_OPT_BOOL, 654 .help = "open drive file as read-only", 655 },{ 656 .name = "rerror", 657 .type = QEMU_OPT_STRING, 658 .help = "read error action", 659 },{ 660 .name = "werror", 661 .type = QEMU_OPT_STRING, 662 .help = "write error action", 663 },{ 664 .name = "copy-on-read", 665 .type = QEMU_OPT_BOOL, 666 .help = "copy read data from backing file into image file", 667 }, 668 669 { /* end of list */ } 670 }, 671 }; 672 673 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 674 { 675 const char *value; 676 BlockBackend *blk; 677 DriveInfo *dinfo = NULL; 678 QDict *bs_opts; 679 QemuOpts *legacy_opts; 680 DriveMediaType media = MEDIA_DISK; 681 BlockInterfaceType type; 682 int cyls, heads, secs, translation; 683 int max_devs, bus_id, unit_id, index; 684 const char *devaddr; 685 const char *werror, *rerror; 686 bool read_only = false; 687 bool copy_on_read; 688 const char *serial; 689 const char *filename; 690 Error *local_err = NULL; 691 int i; 692 693 /* Change legacy command line options into QMP ones */ 694 static const struct { 695 const char *from; 696 const char *to; 697 } opt_renames[] = { 698 { "iops", "throttling.iops-total" }, 699 { "iops_rd", "throttling.iops-read" }, 700 { "iops_wr", "throttling.iops-write" }, 701 702 { "bps", "throttling.bps-total" }, 703 { "bps_rd", "throttling.bps-read" }, 704 { "bps_wr", "throttling.bps-write" }, 705 706 { "iops_max", "throttling.iops-total-max" }, 707 { "iops_rd_max", "throttling.iops-read-max" }, 708 { "iops_wr_max", "throttling.iops-write-max" }, 709 710 { "bps_max", "throttling.bps-total-max" }, 711 { "bps_rd_max", "throttling.bps-read-max" }, 712 { "bps_wr_max", "throttling.bps-write-max" }, 713 714 { "iops_size", "throttling.iops-size" }, 715 716 { "readonly", "read-only" }, 717 }; 718 719 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 720 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 721 &local_err); 722 if (local_err) { 723 error_report_err(local_err); 724 return NULL; 725 } 726 } 727 728 value = qemu_opt_get(all_opts, "cache"); 729 if (value) { 730 int flags = 0; 731 732 if (bdrv_parse_cache_flags(value, &flags) != 0) { 733 error_report("invalid cache option"); 734 return NULL; 735 } 736 737 /* Specific options take precedence */ 738 if (!qemu_opt_get(all_opts, "cache.writeback")) { 739 qemu_opt_set_bool(all_opts, "cache.writeback", 740 !!(flags & BDRV_O_CACHE_WB)); 741 } 742 if (!qemu_opt_get(all_opts, "cache.direct")) { 743 qemu_opt_set_bool(all_opts, "cache.direct", 744 !!(flags & BDRV_O_NOCACHE)); 745 } 746 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 747 qemu_opt_set_bool(all_opts, "cache.no-flush", 748 !!(flags & BDRV_O_NO_FLUSH)); 749 } 750 qemu_opt_unset(all_opts, "cache"); 751 } 752 753 /* Get a QDict for processing the options */ 754 bs_opts = qdict_new(); 755 qemu_opts_to_qdict(all_opts, bs_opts); 756 757 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 758 &error_abort); 759 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 760 if (local_err) { 761 error_report_err(local_err); 762 goto fail; 763 } 764 765 /* Deprecated option boot=[on|off] */ 766 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 767 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 768 "ignored. Future versions will reject this parameter. Please " 769 "update your scripts.\n"); 770 } 771 772 /* Media type */ 773 value = qemu_opt_get(legacy_opts, "media"); 774 if (value) { 775 if (!strcmp(value, "disk")) { 776 media = MEDIA_DISK; 777 } else if (!strcmp(value, "cdrom")) { 778 media = MEDIA_CDROM; 779 read_only = true; 780 } else { 781 error_report("'%s' invalid media", value); 782 goto fail; 783 } 784 } 785 786 /* copy-on-read is disabled with a warning for read-only devices */ 787 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 788 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 789 790 if (read_only && copy_on_read) { 791 error_report("warning: disabling copy-on-read on read-only drive"); 792 copy_on_read = false; 793 } 794 795 qdict_put(bs_opts, "read-only", 796 qstring_from_str(read_only ? "on" : "off")); 797 qdict_put(bs_opts, "copy-on-read", 798 qstring_from_str(copy_on_read ? "on" :"off")); 799 800 /* Controller type */ 801 value = qemu_opt_get(legacy_opts, "if"); 802 if (value) { 803 for (type = 0; 804 type < IF_COUNT && strcmp(value, if_name[type]); 805 type++) { 806 } 807 if (type == IF_COUNT) { 808 error_report("unsupported bus type '%s'", value); 809 goto fail; 810 } 811 } else { 812 type = block_default_type; 813 } 814 815 /* Geometry */ 816 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 817 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 818 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 819 820 if (cyls || heads || secs) { 821 if (cyls < 1) { 822 error_report("invalid physical cyls number"); 823 goto fail; 824 } 825 if (heads < 1) { 826 error_report("invalid physical heads number"); 827 goto fail; 828 } 829 if (secs < 1) { 830 error_report("invalid physical secs number"); 831 goto fail; 832 } 833 } 834 835 translation = BIOS_ATA_TRANSLATION_AUTO; 836 value = qemu_opt_get(legacy_opts, "trans"); 837 if (value != NULL) { 838 if (!cyls) { 839 error_report("'%s' trans must be used with cyls, heads and secs", 840 value); 841 goto fail; 842 } 843 if (!strcmp(value, "none")) { 844 translation = BIOS_ATA_TRANSLATION_NONE; 845 } else if (!strcmp(value, "lba")) { 846 translation = BIOS_ATA_TRANSLATION_LBA; 847 } else if (!strcmp(value, "large")) { 848 translation = BIOS_ATA_TRANSLATION_LARGE; 849 } else if (!strcmp(value, "rechs")) { 850 translation = BIOS_ATA_TRANSLATION_RECHS; 851 } else if (!strcmp(value, "auto")) { 852 translation = BIOS_ATA_TRANSLATION_AUTO; 853 } else { 854 error_report("'%s' invalid translation type", value); 855 goto fail; 856 } 857 } 858 859 if (media == MEDIA_CDROM) { 860 if (cyls || secs || heads) { 861 error_report("CHS can't be set with media=cdrom"); 862 goto fail; 863 } 864 } 865 866 /* Device address specified by bus/unit or index. 867 * If none was specified, try to find the first free one. */ 868 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 869 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 870 index = qemu_opt_get_number(legacy_opts, "index", -1); 871 872 max_devs = if_max_devs[type]; 873 874 if (index != -1) { 875 if (bus_id != 0 || unit_id != -1) { 876 error_report("index cannot be used with bus and unit"); 877 goto fail; 878 } 879 bus_id = drive_index_to_bus_id(type, index); 880 unit_id = drive_index_to_unit_id(type, index); 881 } 882 883 if (unit_id == -1) { 884 unit_id = 0; 885 while (drive_get(type, bus_id, unit_id) != NULL) { 886 unit_id++; 887 if (max_devs && unit_id >= max_devs) { 888 unit_id -= max_devs; 889 bus_id++; 890 } 891 } 892 } 893 894 if (max_devs && unit_id >= max_devs) { 895 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 896 goto fail; 897 } 898 899 if (drive_get(type, bus_id, unit_id) != NULL) { 900 error_report("drive with bus=%d, unit=%d (index=%d) exists", 901 bus_id, unit_id, index); 902 goto fail; 903 } 904 905 /* Serial number */ 906 serial = qemu_opt_get(legacy_opts, "serial"); 907 908 /* no id supplied -> create one */ 909 if (qemu_opts_id(all_opts) == NULL) { 910 char *new_id; 911 const char *mediastr = ""; 912 if (type == IF_IDE || type == IF_SCSI) { 913 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 914 } 915 if (max_devs) { 916 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 917 mediastr, unit_id); 918 } else { 919 new_id = g_strdup_printf("%s%s%i", if_name[type], 920 mediastr, unit_id); 921 } 922 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 923 g_free(new_id); 924 } 925 926 /* Add virtio block device */ 927 devaddr = qemu_opt_get(legacy_opts, "addr"); 928 if (devaddr && type != IF_VIRTIO) { 929 error_report("addr is not supported by this bus type"); 930 goto fail; 931 } 932 933 if (type == IF_VIRTIO) { 934 QemuOpts *devopts; 935 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 936 &error_abort); 937 if (arch_type == QEMU_ARCH_S390X) { 938 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 939 } else { 940 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 941 } 942 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 943 if (devaddr) { 944 qemu_opt_set(devopts, "addr", devaddr); 945 } 946 } 947 948 filename = qemu_opt_get(legacy_opts, "file"); 949 950 /* Check werror/rerror compatibility with if=... */ 951 werror = qemu_opt_get(legacy_opts, "werror"); 952 if (werror != NULL) { 953 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 954 type != IF_NONE) { 955 error_report("werror is not supported by this bus type"); 956 goto fail; 957 } 958 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 959 } 960 961 rerror = qemu_opt_get(legacy_opts, "rerror"); 962 if (rerror != NULL) { 963 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 964 type != IF_NONE) { 965 error_report("rerror is not supported by this bus type"); 966 goto fail; 967 } 968 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 969 } 970 971 /* Actual block device init: Functionality shared with blockdev-add */ 972 blk = blockdev_init(filename, bs_opts, &local_err); 973 bs_opts = NULL; 974 if (!blk) { 975 if (local_err) { 976 error_report_err(local_err); 977 } 978 goto fail; 979 } else { 980 assert(!local_err); 981 } 982 983 /* Create legacy DriveInfo */ 984 dinfo = g_malloc0(sizeof(*dinfo)); 985 dinfo->opts = all_opts; 986 987 dinfo->cyls = cyls; 988 dinfo->heads = heads; 989 dinfo->secs = secs; 990 dinfo->trans = translation; 991 992 dinfo->type = type; 993 dinfo->bus = bus_id; 994 dinfo->unit = unit_id; 995 dinfo->devaddr = devaddr; 996 dinfo->serial = g_strdup(serial); 997 998 blk_set_legacy_dinfo(blk, dinfo); 999 1000 switch(type) { 1001 case IF_IDE: 1002 case IF_SCSI: 1003 case IF_XEN: 1004 case IF_NONE: 1005 dinfo->media_cd = media == MEDIA_CDROM; 1006 break; 1007 default: 1008 break; 1009 } 1010 1011 fail: 1012 qemu_opts_del(legacy_opts); 1013 QDECREF(bs_opts); 1014 return dinfo; 1015 } 1016 1017 void hmp_commit(Monitor *mon, const QDict *qdict) 1018 { 1019 const char *device = qdict_get_str(qdict, "device"); 1020 BlockDriverState *bs; 1021 int ret; 1022 1023 if (!strcmp(device, "all")) { 1024 ret = bdrv_commit_all(); 1025 } else { 1026 bs = bdrv_find(device); 1027 if (!bs) { 1028 monitor_printf(mon, "Device '%s' not found\n", device); 1029 return; 1030 } 1031 ret = bdrv_commit(bs); 1032 } 1033 if (ret < 0) { 1034 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1035 strerror(-ret)); 1036 } 1037 } 1038 1039 static void blockdev_do_action(int kind, void *data, Error **errp) 1040 { 1041 TransactionAction action; 1042 TransactionActionList list; 1043 1044 action.kind = kind; 1045 action.data = data; 1046 list.value = &action; 1047 list.next = NULL; 1048 qmp_transaction(&list, errp); 1049 } 1050 1051 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1052 bool has_node_name, const char *node_name, 1053 const char *snapshot_file, 1054 bool has_snapshot_node_name, 1055 const char *snapshot_node_name, 1056 bool has_format, const char *format, 1057 bool has_mode, NewImageMode mode, Error **errp) 1058 { 1059 BlockdevSnapshot snapshot = { 1060 .has_device = has_device, 1061 .device = (char *) device, 1062 .has_node_name = has_node_name, 1063 .node_name = (char *) node_name, 1064 .snapshot_file = (char *) snapshot_file, 1065 .has_snapshot_node_name = has_snapshot_node_name, 1066 .snapshot_node_name = (char *) snapshot_node_name, 1067 .has_format = has_format, 1068 .format = (char *) format, 1069 .has_mode = has_mode, 1070 .mode = mode, 1071 }; 1072 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1073 &snapshot, errp); 1074 } 1075 1076 void qmp_blockdev_snapshot_internal_sync(const char *device, 1077 const char *name, 1078 Error **errp) 1079 { 1080 BlockdevSnapshotInternal snapshot = { 1081 .device = (char *) device, 1082 .name = (char *) name 1083 }; 1084 1085 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1086 &snapshot, errp); 1087 } 1088 1089 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1090 bool has_id, 1091 const char *id, 1092 bool has_name, 1093 const char *name, 1094 Error **errp) 1095 { 1096 BlockDriverState *bs = bdrv_find(device); 1097 AioContext *aio_context; 1098 QEMUSnapshotInfo sn; 1099 Error *local_err = NULL; 1100 SnapshotInfo *info = NULL; 1101 int ret; 1102 1103 if (!bs) { 1104 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1105 return NULL; 1106 } 1107 1108 if (!has_id) { 1109 id = NULL; 1110 } 1111 1112 if (!has_name) { 1113 name = NULL; 1114 } 1115 1116 if (!id && !name) { 1117 error_setg(errp, "Name or id must be provided"); 1118 return NULL; 1119 } 1120 1121 aio_context = bdrv_get_aio_context(bs); 1122 aio_context_acquire(aio_context); 1123 1124 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1125 goto out_aio_context; 1126 } 1127 1128 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1129 if (local_err) { 1130 error_propagate(errp, local_err); 1131 goto out_aio_context; 1132 } 1133 if (!ret) { 1134 error_setg(errp, 1135 "Snapshot with id '%s' and name '%s' does not exist on " 1136 "device '%s'", 1137 STR_OR_NULL(id), STR_OR_NULL(name), device); 1138 goto out_aio_context; 1139 } 1140 1141 bdrv_snapshot_delete(bs, id, name, &local_err); 1142 if (local_err) { 1143 error_propagate(errp, local_err); 1144 goto out_aio_context; 1145 } 1146 1147 aio_context_release(aio_context); 1148 1149 info = g_new0(SnapshotInfo, 1); 1150 info->id = g_strdup(sn.id_str); 1151 info->name = g_strdup(sn.name); 1152 info->date_nsec = sn.date_nsec; 1153 info->date_sec = sn.date_sec; 1154 info->vm_state_size = sn.vm_state_size; 1155 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1156 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1157 1158 return info; 1159 1160 out_aio_context: 1161 aio_context_release(aio_context); 1162 return NULL; 1163 } 1164 1165 /* New and old BlockDriverState structs for atomic group operations */ 1166 1167 typedef struct BlkTransactionState BlkTransactionState; 1168 1169 /* Only prepare() may fail. In a single transaction, only one of commit() or 1170 abort() will be called, clean() will always be called if it present. */ 1171 typedef struct BdrvActionOps { 1172 /* Size of state struct, in bytes. */ 1173 size_t instance_size; 1174 /* Prepare the work, must NOT be NULL. */ 1175 void (*prepare)(BlkTransactionState *common, Error **errp); 1176 /* Commit the changes, can be NULL. */ 1177 void (*commit)(BlkTransactionState *common); 1178 /* Abort the changes on fail, can be NULL. */ 1179 void (*abort)(BlkTransactionState *common); 1180 /* Clean up resource in the end, can be NULL. */ 1181 void (*clean)(BlkTransactionState *common); 1182 } BdrvActionOps; 1183 1184 /* 1185 * This structure must be arranged as first member in child type, assuming 1186 * that compiler will also arrange it to the same address with parent instance. 1187 * Later it will be used in free(). 1188 */ 1189 struct BlkTransactionState { 1190 TransactionAction *action; 1191 const BdrvActionOps *ops; 1192 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1193 }; 1194 1195 /* internal snapshot private data */ 1196 typedef struct InternalSnapshotState { 1197 BlkTransactionState common; 1198 BlockDriverState *bs; 1199 AioContext *aio_context; 1200 QEMUSnapshotInfo sn; 1201 } InternalSnapshotState; 1202 1203 static void internal_snapshot_prepare(BlkTransactionState *common, 1204 Error **errp) 1205 { 1206 Error *local_err = NULL; 1207 const char *device; 1208 const char *name; 1209 BlockDriverState *bs; 1210 QEMUSnapshotInfo old_sn, *sn; 1211 bool ret; 1212 qemu_timeval tv; 1213 BlockdevSnapshotInternal *internal; 1214 InternalSnapshotState *state; 1215 int ret1; 1216 1217 g_assert(common->action->kind == 1218 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1219 internal = common->action->blockdev_snapshot_internal_sync; 1220 state = DO_UPCAST(InternalSnapshotState, common, common); 1221 1222 /* 1. parse input */ 1223 device = internal->device; 1224 name = internal->name; 1225 1226 /* 2. check for validation */ 1227 bs = bdrv_find(device); 1228 if (!bs) { 1229 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1230 return; 1231 } 1232 1233 /* AioContext is released in .clean() */ 1234 state->aio_context = bdrv_get_aio_context(bs); 1235 aio_context_acquire(state->aio_context); 1236 1237 if (!bdrv_is_inserted(bs)) { 1238 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1239 return; 1240 } 1241 1242 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1243 return; 1244 } 1245 1246 if (bdrv_is_read_only(bs)) { 1247 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1248 return; 1249 } 1250 1251 if (!bdrv_can_snapshot(bs)) { 1252 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1253 bs->drv->format_name, device, "internal snapshot"); 1254 return; 1255 } 1256 1257 if (!strlen(name)) { 1258 error_setg(errp, "Name is empty"); 1259 return; 1260 } 1261 1262 /* check whether a snapshot with name exist */ 1263 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1264 &local_err); 1265 if (local_err) { 1266 error_propagate(errp, local_err); 1267 return; 1268 } else if (ret) { 1269 error_setg(errp, 1270 "Snapshot with name '%s' already exists on device '%s'", 1271 name, device); 1272 return; 1273 } 1274 1275 /* 3. take the snapshot */ 1276 sn = &state->sn; 1277 pstrcpy(sn->name, sizeof(sn->name), name); 1278 qemu_gettimeofday(&tv); 1279 sn->date_sec = tv.tv_sec; 1280 sn->date_nsec = tv.tv_usec * 1000; 1281 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1282 1283 ret1 = bdrv_snapshot_create(bs, sn); 1284 if (ret1 < 0) { 1285 error_setg_errno(errp, -ret1, 1286 "Failed to create snapshot '%s' on device '%s'", 1287 name, device); 1288 return; 1289 } 1290 1291 /* 4. succeed, mark a snapshot is created */ 1292 state->bs = bs; 1293 } 1294 1295 static void internal_snapshot_abort(BlkTransactionState *common) 1296 { 1297 InternalSnapshotState *state = 1298 DO_UPCAST(InternalSnapshotState, common, common); 1299 BlockDriverState *bs = state->bs; 1300 QEMUSnapshotInfo *sn = &state->sn; 1301 Error *local_error = NULL; 1302 1303 if (!bs) { 1304 return; 1305 } 1306 1307 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1308 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1309 "device '%s' in abort: %s", 1310 sn->id_str, 1311 sn->name, 1312 bdrv_get_device_name(bs), 1313 error_get_pretty(local_error)); 1314 error_free(local_error); 1315 } 1316 } 1317 1318 static void internal_snapshot_clean(BlkTransactionState *common) 1319 { 1320 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1321 common, common); 1322 1323 if (state->aio_context) { 1324 aio_context_release(state->aio_context); 1325 } 1326 } 1327 1328 /* external snapshot private data */ 1329 typedef struct ExternalSnapshotState { 1330 BlkTransactionState common; 1331 BlockDriverState *old_bs; 1332 BlockDriverState *new_bs; 1333 AioContext *aio_context; 1334 } ExternalSnapshotState; 1335 1336 static void external_snapshot_prepare(BlkTransactionState *common, 1337 Error **errp) 1338 { 1339 BlockDriver *drv; 1340 int flags, ret; 1341 QDict *options = NULL; 1342 Error *local_err = NULL; 1343 bool has_device = false; 1344 const char *device; 1345 bool has_node_name = false; 1346 const char *node_name; 1347 bool has_snapshot_node_name = false; 1348 const char *snapshot_node_name; 1349 const char *new_image_file; 1350 const char *format = "qcow2"; 1351 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1352 ExternalSnapshotState *state = 1353 DO_UPCAST(ExternalSnapshotState, common, common); 1354 TransactionAction *action = common->action; 1355 1356 /* get parameters */ 1357 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1358 1359 has_device = action->blockdev_snapshot_sync->has_device; 1360 device = action->blockdev_snapshot_sync->device; 1361 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1362 node_name = action->blockdev_snapshot_sync->node_name; 1363 has_snapshot_node_name = 1364 action->blockdev_snapshot_sync->has_snapshot_node_name; 1365 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1366 1367 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1368 if (action->blockdev_snapshot_sync->has_format) { 1369 format = action->blockdev_snapshot_sync->format; 1370 } 1371 if (action->blockdev_snapshot_sync->has_mode) { 1372 mode = action->blockdev_snapshot_sync->mode; 1373 } 1374 1375 /* start processing */ 1376 drv = bdrv_find_format(format); 1377 if (!drv) { 1378 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1379 return; 1380 } 1381 1382 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1383 has_node_name ? node_name : NULL, 1384 &local_err); 1385 if (local_err) { 1386 error_propagate(errp, local_err); 1387 return; 1388 } 1389 1390 if (has_node_name && !has_snapshot_node_name) { 1391 error_setg(errp, "New snapshot node name missing"); 1392 return; 1393 } 1394 1395 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1396 error_setg(errp, "New snapshot node name already existing"); 1397 return; 1398 } 1399 1400 /* Acquire AioContext now so any threads operating on old_bs stop */ 1401 state->aio_context = bdrv_get_aio_context(state->old_bs); 1402 aio_context_acquire(state->aio_context); 1403 1404 if (!bdrv_is_inserted(state->old_bs)) { 1405 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1406 return; 1407 } 1408 1409 if (bdrv_op_is_blocked(state->old_bs, 1410 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1411 return; 1412 } 1413 1414 if (!bdrv_is_read_only(state->old_bs)) { 1415 if (bdrv_flush(state->old_bs)) { 1416 error_set(errp, QERR_IO_ERROR); 1417 return; 1418 } 1419 } 1420 1421 if (!bdrv_is_first_non_filter(state->old_bs)) { 1422 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1423 return; 1424 } 1425 1426 flags = state->old_bs->open_flags; 1427 1428 /* create new image w/backing file */ 1429 if (mode != NEW_IMAGE_MODE_EXISTING) { 1430 bdrv_img_create(new_image_file, format, 1431 state->old_bs->filename, 1432 state->old_bs->drv->format_name, 1433 NULL, -1, flags, &local_err, false); 1434 if (local_err) { 1435 error_propagate(errp, local_err); 1436 return; 1437 } 1438 } 1439 1440 if (has_snapshot_node_name) { 1441 options = qdict_new(); 1442 qdict_put(options, "node-name", 1443 qstring_from_str(snapshot_node_name)); 1444 } 1445 1446 /* TODO Inherit bs->options or only take explicit options with an 1447 * extended QMP command? */ 1448 assert(state->new_bs == NULL); 1449 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1450 flags | BDRV_O_NO_BACKING, drv, &local_err); 1451 /* We will manually add the backing_hd field to the bs later */ 1452 if (ret != 0) { 1453 error_propagate(errp, local_err); 1454 } 1455 } 1456 1457 static void external_snapshot_commit(BlkTransactionState *common) 1458 { 1459 ExternalSnapshotState *state = 1460 DO_UPCAST(ExternalSnapshotState, common, common); 1461 1462 bdrv_set_aio_context(state->new_bs, state->aio_context); 1463 1464 /* This removes our old bs and adds the new bs */ 1465 bdrv_append(state->new_bs, state->old_bs); 1466 /* We don't need (or want) to use the transactional 1467 * bdrv_reopen_multiple() across all the entries at once, because we 1468 * don't want to abort all of them if one of them fails the reopen */ 1469 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1470 NULL); 1471 1472 aio_context_release(state->aio_context); 1473 } 1474 1475 static void external_snapshot_abort(BlkTransactionState *common) 1476 { 1477 ExternalSnapshotState *state = 1478 DO_UPCAST(ExternalSnapshotState, common, common); 1479 if (state->new_bs) { 1480 bdrv_unref(state->new_bs); 1481 } 1482 if (state->aio_context) { 1483 aio_context_release(state->aio_context); 1484 } 1485 } 1486 1487 typedef struct DriveBackupState { 1488 BlkTransactionState common; 1489 BlockDriverState *bs; 1490 AioContext *aio_context; 1491 BlockJob *job; 1492 } DriveBackupState; 1493 1494 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1495 { 1496 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1497 BlockDriverState *bs; 1498 DriveBackup *backup; 1499 Error *local_err = NULL; 1500 1501 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1502 backup = common->action->drive_backup; 1503 1504 bs = bdrv_find(backup->device); 1505 if (!bs) { 1506 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1507 return; 1508 } 1509 1510 /* AioContext is released in .clean() */ 1511 state->aio_context = bdrv_get_aio_context(bs); 1512 aio_context_acquire(state->aio_context); 1513 1514 qmp_drive_backup(backup->device, backup->target, 1515 backup->has_format, backup->format, 1516 backup->sync, 1517 backup->has_mode, backup->mode, 1518 backup->has_speed, backup->speed, 1519 backup->has_on_source_error, backup->on_source_error, 1520 backup->has_on_target_error, backup->on_target_error, 1521 &local_err); 1522 if (local_err) { 1523 error_propagate(errp, local_err); 1524 return; 1525 } 1526 1527 state->bs = bs; 1528 state->job = state->bs->job; 1529 } 1530 1531 static void drive_backup_abort(BlkTransactionState *common) 1532 { 1533 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1534 BlockDriverState *bs = state->bs; 1535 1536 /* Only cancel if it's the job we started */ 1537 if (bs && bs->job && bs->job == state->job) { 1538 block_job_cancel_sync(bs->job); 1539 } 1540 } 1541 1542 static void drive_backup_clean(BlkTransactionState *common) 1543 { 1544 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1545 1546 if (state->aio_context) { 1547 aio_context_release(state->aio_context); 1548 } 1549 } 1550 1551 typedef struct BlockdevBackupState { 1552 BlkTransactionState common; 1553 BlockDriverState *bs; 1554 BlockJob *job; 1555 AioContext *aio_context; 1556 } BlockdevBackupState; 1557 1558 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1559 { 1560 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1561 BlockdevBackup *backup; 1562 BlockDriverState *bs, *target; 1563 Error *local_err = NULL; 1564 1565 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1566 backup = common->action->blockdev_backup; 1567 1568 bs = bdrv_find(backup->device); 1569 if (!bs) { 1570 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1571 return; 1572 } 1573 1574 target = bdrv_find(backup->target); 1575 if (!target) { 1576 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->target); 1577 return; 1578 } 1579 1580 /* AioContext is released in .clean() */ 1581 state->aio_context = bdrv_get_aio_context(bs); 1582 if (state->aio_context != bdrv_get_aio_context(target)) { 1583 state->aio_context = NULL; 1584 error_setg(errp, "Backup between two IO threads is not implemented"); 1585 return; 1586 } 1587 aio_context_acquire(state->aio_context); 1588 1589 qmp_blockdev_backup(backup->device, backup->target, 1590 backup->sync, 1591 backup->has_speed, backup->speed, 1592 backup->has_on_source_error, backup->on_source_error, 1593 backup->has_on_target_error, backup->on_target_error, 1594 &local_err); 1595 if (local_err) { 1596 error_propagate(errp, local_err); 1597 return; 1598 } 1599 1600 state->bs = bs; 1601 state->job = state->bs->job; 1602 } 1603 1604 static void blockdev_backup_abort(BlkTransactionState *common) 1605 { 1606 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1607 BlockDriverState *bs = state->bs; 1608 1609 /* Only cancel if it's the job we started */ 1610 if (bs && bs->job && bs->job == state->job) { 1611 block_job_cancel_sync(bs->job); 1612 } 1613 } 1614 1615 static void blockdev_backup_clean(BlkTransactionState *common) 1616 { 1617 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1618 1619 if (state->aio_context) { 1620 aio_context_release(state->aio_context); 1621 } 1622 } 1623 1624 static void abort_prepare(BlkTransactionState *common, Error **errp) 1625 { 1626 error_setg(errp, "Transaction aborted using Abort action"); 1627 } 1628 1629 static void abort_commit(BlkTransactionState *common) 1630 { 1631 g_assert_not_reached(); /* this action never succeeds */ 1632 } 1633 1634 static const BdrvActionOps actions[] = { 1635 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1636 .instance_size = sizeof(ExternalSnapshotState), 1637 .prepare = external_snapshot_prepare, 1638 .commit = external_snapshot_commit, 1639 .abort = external_snapshot_abort, 1640 }, 1641 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1642 .instance_size = sizeof(DriveBackupState), 1643 .prepare = drive_backup_prepare, 1644 .abort = drive_backup_abort, 1645 .clean = drive_backup_clean, 1646 }, 1647 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1648 .instance_size = sizeof(BlockdevBackupState), 1649 .prepare = blockdev_backup_prepare, 1650 .abort = blockdev_backup_abort, 1651 .clean = blockdev_backup_clean, 1652 }, 1653 [TRANSACTION_ACTION_KIND_ABORT] = { 1654 .instance_size = sizeof(BlkTransactionState), 1655 .prepare = abort_prepare, 1656 .commit = abort_commit, 1657 }, 1658 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1659 .instance_size = sizeof(InternalSnapshotState), 1660 .prepare = internal_snapshot_prepare, 1661 .abort = internal_snapshot_abort, 1662 .clean = internal_snapshot_clean, 1663 }, 1664 }; 1665 1666 /* 1667 * 'Atomic' group operations. The operations are performed as a set, and if 1668 * any fail then we roll back all operations in the group. 1669 */ 1670 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1671 { 1672 TransactionActionList *dev_entry = dev_list; 1673 BlkTransactionState *state, *next; 1674 Error *local_err = NULL; 1675 1676 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1677 QSIMPLEQ_INIT(&snap_bdrv_states); 1678 1679 /* drain all i/o before any operations */ 1680 bdrv_drain_all(); 1681 1682 /* We don't do anything in this loop that commits us to the operations */ 1683 while (NULL != dev_entry) { 1684 TransactionAction *dev_info = NULL; 1685 const BdrvActionOps *ops; 1686 1687 dev_info = dev_entry->value; 1688 dev_entry = dev_entry->next; 1689 1690 assert(dev_info->kind < ARRAY_SIZE(actions)); 1691 1692 ops = &actions[dev_info->kind]; 1693 assert(ops->instance_size > 0); 1694 1695 state = g_malloc0(ops->instance_size); 1696 state->ops = ops; 1697 state->action = dev_info; 1698 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1699 1700 state->ops->prepare(state, &local_err); 1701 if (local_err) { 1702 error_propagate(errp, local_err); 1703 goto delete_and_fail; 1704 } 1705 } 1706 1707 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1708 if (state->ops->commit) { 1709 state->ops->commit(state); 1710 } 1711 } 1712 1713 /* success */ 1714 goto exit; 1715 1716 delete_and_fail: 1717 /* failure, and it is all-or-none; roll back all operations */ 1718 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1719 if (state->ops->abort) { 1720 state->ops->abort(state); 1721 } 1722 } 1723 exit: 1724 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1725 if (state->ops->clean) { 1726 state->ops->clean(state); 1727 } 1728 g_free(state); 1729 } 1730 } 1731 1732 1733 static void eject_device(BlockBackend *blk, int force, Error **errp) 1734 { 1735 BlockDriverState *bs = blk_bs(blk); 1736 AioContext *aio_context; 1737 1738 aio_context = bdrv_get_aio_context(bs); 1739 aio_context_acquire(aio_context); 1740 1741 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1742 goto out; 1743 } 1744 if (!blk_dev_has_removable_media(blk)) { 1745 error_setg(errp, "Device '%s' is not removable", 1746 bdrv_get_device_name(bs)); 1747 goto out; 1748 } 1749 1750 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1751 blk_dev_eject_request(blk, force); 1752 if (!force) { 1753 error_setg(errp, "Device '%s' is locked", 1754 bdrv_get_device_name(bs)); 1755 goto out; 1756 } 1757 } 1758 1759 bdrv_close(bs); 1760 1761 out: 1762 aio_context_release(aio_context); 1763 } 1764 1765 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1766 { 1767 BlockBackend *blk; 1768 1769 blk = blk_by_name(device); 1770 if (!blk) { 1771 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1772 return; 1773 } 1774 1775 eject_device(blk, force, errp); 1776 } 1777 1778 void qmp_block_passwd(bool has_device, const char *device, 1779 bool has_node_name, const char *node_name, 1780 const char *password, Error **errp) 1781 { 1782 Error *local_err = NULL; 1783 BlockDriverState *bs; 1784 AioContext *aio_context; 1785 1786 bs = bdrv_lookup_bs(has_device ? device : NULL, 1787 has_node_name ? node_name : NULL, 1788 &local_err); 1789 if (local_err) { 1790 error_propagate(errp, local_err); 1791 return; 1792 } 1793 1794 aio_context = bdrv_get_aio_context(bs); 1795 aio_context_acquire(aio_context); 1796 1797 bdrv_add_key(bs, password, errp); 1798 1799 aio_context_release(aio_context); 1800 } 1801 1802 /* Assumes AioContext is held */ 1803 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1804 int bdrv_flags, BlockDriver *drv, 1805 const char *password, Error **errp) 1806 { 1807 Error *local_err = NULL; 1808 int ret; 1809 1810 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1811 if (ret < 0) { 1812 error_propagate(errp, local_err); 1813 return; 1814 } 1815 1816 bdrv_add_key(bs, password, errp); 1817 } 1818 1819 void qmp_change_blockdev(const char *device, const char *filename, 1820 const char *format, Error **errp) 1821 { 1822 BlockBackend *blk; 1823 BlockDriverState *bs; 1824 AioContext *aio_context; 1825 BlockDriver *drv = NULL; 1826 int bdrv_flags; 1827 Error *err = NULL; 1828 1829 blk = blk_by_name(device); 1830 if (!blk) { 1831 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1832 return; 1833 } 1834 bs = blk_bs(blk); 1835 1836 aio_context = bdrv_get_aio_context(bs); 1837 aio_context_acquire(aio_context); 1838 1839 if (format) { 1840 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1841 if (!drv) { 1842 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1843 goto out; 1844 } 1845 } 1846 1847 eject_device(blk, 0, &err); 1848 if (err) { 1849 error_propagate(errp, err); 1850 goto out; 1851 } 1852 1853 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1854 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1855 1856 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1857 1858 out: 1859 aio_context_release(aio_context); 1860 } 1861 1862 /* throttling disk I/O limits */ 1863 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1864 int64_t bps_wr, 1865 int64_t iops, 1866 int64_t iops_rd, 1867 int64_t iops_wr, 1868 bool has_bps_max, 1869 int64_t bps_max, 1870 bool has_bps_rd_max, 1871 int64_t bps_rd_max, 1872 bool has_bps_wr_max, 1873 int64_t bps_wr_max, 1874 bool has_iops_max, 1875 int64_t iops_max, 1876 bool has_iops_rd_max, 1877 int64_t iops_rd_max, 1878 bool has_iops_wr_max, 1879 int64_t iops_wr_max, 1880 bool has_iops_size, 1881 int64_t iops_size, Error **errp) 1882 { 1883 ThrottleConfig cfg; 1884 BlockDriverState *bs; 1885 AioContext *aio_context; 1886 1887 bs = bdrv_find(device); 1888 if (!bs) { 1889 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1890 return; 1891 } 1892 1893 memset(&cfg, 0, sizeof(cfg)); 1894 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1895 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1896 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1897 1898 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1899 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1900 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1901 1902 if (has_bps_max) { 1903 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1904 } 1905 if (has_bps_rd_max) { 1906 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1907 } 1908 if (has_bps_wr_max) { 1909 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1910 } 1911 if (has_iops_max) { 1912 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1913 } 1914 if (has_iops_rd_max) { 1915 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1916 } 1917 if (has_iops_wr_max) { 1918 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1919 } 1920 1921 if (has_iops_size) { 1922 cfg.op_size = iops_size; 1923 } 1924 1925 if (!check_throttle_config(&cfg, errp)) { 1926 return; 1927 } 1928 1929 aio_context = bdrv_get_aio_context(bs); 1930 aio_context_acquire(aio_context); 1931 1932 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1933 bdrv_io_limits_enable(bs); 1934 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1935 bdrv_io_limits_disable(bs); 1936 } 1937 1938 if (bs->io_limits_enabled) { 1939 bdrv_set_io_limits(bs, &cfg); 1940 } 1941 1942 aio_context_release(aio_context); 1943 } 1944 1945 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1946 { 1947 const char *id = qdict_get_str(qdict, "id"); 1948 BlockBackend *blk; 1949 BlockDriverState *bs; 1950 AioContext *aio_context; 1951 Error *local_err = NULL; 1952 1953 blk = blk_by_name(id); 1954 if (!blk) { 1955 error_report("Device '%s' not found", id); 1956 return -1; 1957 } 1958 bs = blk_bs(blk); 1959 1960 if (!blk_legacy_dinfo(blk)) { 1961 error_report("Deleting device added with blockdev-add" 1962 " is not supported"); 1963 return -1; 1964 } 1965 1966 aio_context = bdrv_get_aio_context(bs); 1967 aio_context_acquire(aio_context); 1968 1969 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1970 error_report_err(local_err); 1971 aio_context_release(aio_context); 1972 return -1; 1973 } 1974 1975 /* quiesce block driver; prevent further io */ 1976 bdrv_drain_all(); 1977 bdrv_flush(bs); 1978 bdrv_close(bs); 1979 1980 /* if we have a device attached to this BlockDriverState 1981 * then we need to make the drive anonymous until the device 1982 * can be removed. If this is a drive with no device backing 1983 * then we can just get rid of the block driver state right here. 1984 */ 1985 if (blk_get_attached_dev(blk)) { 1986 blk_hide_on_behalf_of_hmp_drive_del(blk); 1987 /* Further I/O must not pause the guest */ 1988 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1989 BLOCKDEV_ON_ERROR_REPORT); 1990 } else { 1991 blk_unref(blk); 1992 } 1993 1994 aio_context_release(aio_context); 1995 return 0; 1996 } 1997 1998 void qmp_block_resize(bool has_device, const char *device, 1999 bool has_node_name, const char *node_name, 2000 int64_t size, Error **errp) 2001 { 2002 Error *local_err = NULL; 2003 BlockDriverState *bs; 2004 AioContext *aio_context; 2005 int ret; 2006 2007 bs = bdrv_lookup_bs(has_device ? device : NULL, 2008 has_node_name ? node_name : NULL, 2009 &local_err); 2010 if (local_err) { 2011 error_propagate(errp, local_err); 2012 return; 2013 } 2014 2015 aio_context = bdrv_get_aio_context(bs); 2016 aio_context_acquire(aio_context); 2017 2018 if (!bdrv_is_first_non_filter(bs)) { 2019 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2020 goto out; 2021 } 2022 2023 if (size < 0) { 2024 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2025 goto out; 2026 } 2027 2028 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2029 error_set(errp, QERR_DEVICE_IN_USE, device); 2030 goto out; 2031 } 2032 2033 /* complete all in-flight operations before resizing the device */ 2034 bdrv_drain_all(); 2035 2036 ret = bdrv_truncate(bs, size); 2037 switch (ret) { 2038 case 0: 2039 break; 2040 case -ENOMEDIUM: 2041 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2042 break; 2043 case -ENOTSUP: 2044 error_set(errp, QERR_UNSUPPORTED); 2045 break; 2046 case -EACCES: 2047 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 2048 break; 2049 case -EBUSY: 2050 error_set(errp, QERR_DEVICE_IN_USE, device); 2051 break; 2052 default: 2053 error_setg_errno(errp, -ret, "Could not resize"); 2054 break; 2055 } 2056 2057 out: 2058 aio_context_release(aio_context); 2059 } 2060 2061 static void block_job_cb(void *opaque, int ret) 2062 { 2063 /* Note that this function may be executed from another AioContext besides 2064 * the QEMU main loop. If you need to access anything that assumes the 2065 * QEMU global mutex, use a BH or introduce a mutex. 2066 */ 2067 2068 BlockDriverState *bs = opaque; 2069 const char *msg = NULL; 2070 2071 trace_block_job_cb(bs, bs->job, ret); 2072 2073 assert(bs->job); 2074 2075 if (ret < 0) { 2076 msg = strerror(-ret); 2077 } 2078 2079 if (block_job_is_cancelled(bs->job)) { 2080 block_job_event_cancelled(bs->job); 2081 } else { 2082 block_job_event_completed(bs->job, msg); 2083 } 2084 2085 bdrv_put_ref_bh_schedule(bs); 2086 } 2087 2088 void qmp_block_stream(const char *device, 2089 bool has_base, const char *base, 2090 bool has_backing_file, const char *backing_file, 2091 bool has_speed, int64_t speed, 2092 bool has_on_error, BlockdevOnError on_error, 2093 Error **errp) 2094 { 2095 BlockDriverState *bs; 2096 BlockDriverState *base_bs = NULL; 2097 AioContext *aio_context; 2098 Error *local_err = NULL; 2099 const char *base_name = NULL; 2100 2101 if (!has_on_error) { 2102 on_error = BLOCKDEV_ON_ERROR_REPORT; 2103 } 2104 2105 bs = bdrv_find(device); 2106 if (!bs) { 2107 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2108 return; 2109 } 2110 2111 aio_context = bdrv_get_aio_context(bs); 2112 aio_context_acquire(aio_context); 2113 2114 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2115 goto out; 2116 } 2117 2118 if (has_base) { 2119 base_bs = bdrv_find_backing_image(bs, base); 2120 if (base_bs == NULL) { 2121 error_set(errp, QERR_BASE_NOT_FOUND, base); 2122 goto out; 2123 } 2124 assert(bdrv_get_aio_context(base_bs) == aio_context); 2125 base_name = base; 2126 } 2127 2128 /* if we are streaming the entire chain, the result will have no backing 2129 * file, and specifying one is therefore an error */ 2130 if (base_bs == NULL && has_backing_file) { 2131 error_setg(errp, "backing file specified, but streaming the " 2132 "entire chain"); 2133 goto out; 2134 } 2135 2136 /* backing_file string overrides base bs filename */ 2137 base_name = has_backing_file ? backing_file : base_name; 2138 2139 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2140 on_error, block_job_cb, bs, &local_err); 2141 if (local_err) { 2142 error_propagate(errp, local_err); 2143 goto out; 2144 } 2145 2146 trace_qmp_block_stream(bs, bs->job); 2147 2148 out: 2149 aio_context_release(aio_context); 2150 } 2151 2152 void qmp_block_commit(const char *device, 2153 bool has_base, const char *base, 2154 bool has_top, const char *top, 2155 bool has_backing_file, const char *backing_file, 2156 bool has_speed, int64_t speed, 2157 Error **errp) 2158 { 2159 BlockDriverState *bs; 2160 BlockDriverState *base_bs, *top_bs; 2161 AioContext *aio_context; 2162 Error *local_err = NULL; 2163 /* This will be part of the QMP command, if/when the 2164 * BlockdevOnError change for blkmirror makes it in 2165 */ 2166 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2167 2168 if (!has_speed) { 2169 speed = 0; 2170 } 2171 2172 /* Important Note: 2173 * libvirt relies on the DeviceNotFound error class in order to probe for 2174 * live commit feature versions; for this to work, we must make sure to 2175 * perform the device lookup before any generic errors that may occur in a 2176 * scenario in which all optional arguments are omitted. */ 2177 bs = bdrv_find(device); 2178 if (!bs) { 2179 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2180 return; 2181 } 2182 2183 aio_context = bdrv_get_aio_context(bs); 2184 aio_context_acquire(aio_context); 2185 2186 /* drain all i/o before commits */ 2187 bdrv_drain_all(); 2188 2189 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2190 goto out; 2191 } 2192 2193 /* default top_bs is the active layer */ 2194 top_bs = bs; 2195 2196 if (has_top && top) { 2197 if (strcmp(bs->filename, top) != 0) { 2198 top_bs = bdrv_find_backing_image(bs, top); 2199 } 2200 } 2201 2202 if (top_bs == NULL) { 2203 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2204 goto out; 2205 } 2206 2207 assert(bdrv_get_aio_context(top_bs) == aio_context); 2208 2209 if (has_base && base) { 2210 base_bs = bdrv_find_backing_image(top_bs, base); 2211 } else { 2212 base_bs = bdrv_find_base(top_bs); 2213 } 2214 2215 if (base_bs == NULL) { 2216 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2217 goto out; 2218 } 2219 2220 assert(bdrv_get_aio_context(base_bs) == aio_context); 2221 2222 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2223 goto out; 2224 } 2225 2226 /* Do not allow attempts to commit an image into itself */ 2227 if (top_bs == base_bs) { 2228 error_setg(errp, "cannot commit an image into itself"); 2229 goto out; 2230 } 2231 2232 if (top_bs == bs) { 2233 if (has_backing_file) { 2234 error_setg(errp, "'backing-file' specified," 2235 " but 'top' is the active layer"); 2236 goto out; 2237 } 2238 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2239 bs, &local_err); 2240 } else { 2241 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2242 has_backing_file ? backing_file : NULL, &local_err); 2243 } 2244 if (local_err != NULL) { 2245 error_propagate(errp, local_err); 2246 goto out; 2247 } 2248 2249 out: 2250 aio_context_release(aio_context); 2251 } 2252 2253 void qmp_drive_backup(const char *device, const char *target, 2254 bool has_format, const char *format, 2255 enum MirrorSyncMode sync, 2256 bool has_mode, enum NewImageMode mode, 2257 bool has_speed, int64_t speed, 2258 bool has_on_source_error, BlockdevOnError on_source_error, 2259 bool has_on_target_error, BlockdevOnError on_target_error, 2260 Error **errp) 2261 { 2262 BlockDriverState *bs; 2263 BlockDriverState *target_bs; 2264 BlockDriverState *source = NULL; 2265 AioContext *aio_context; 2266 BlockDriver *drv = NULL; 2267 Error *local_err = NULL; 2268 int flags; 2269 int64_t size; 2270 int ret; 2271 2272 if (!has_speed) { 2273 speed = 0; 2274 } 2275 if (!has_on_source_error) { 2276 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2277 } 2278 if (!has_on_target_error) { 2279 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2280 } 2281 if (!has_mode) { 2282 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2283 } 2284 2285 bs = bdrv_find(device); 2286 if (!bs) { 2287 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2288 return; 2289 } 2290 2291 aio_context = bdrv_get_aio_context(bs); 2292 aio_context_acquire(aio_context); 2293 2294 /* Although backup_run has this check too, we need to use bs->drv below, so 2295 * do an early check redundantly. */ 2296 if (!bdrv_is_inserted(bs)) { 2297 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2298 goto out; 2299 } 2300 2301 if (!has_format) { 2302 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2303 } 2304 if (format) { 2305 drv = bdrv_find_format(format); 2306 if (!drv) { 2307 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2308 goto out; 2309 } 2310 } 2311 2312 /* Early check to avoid creating target */ 2313 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2314 goto out; 2315 } 2316 2317 flags = bs->open_flags | BDRV_O_RDWR; 2318 2319 /* See if we have a backing HD we can use to create our new image 2320 * on top of. */ 2321 if (sync == MIRROR_SYNC_MODE_TOP) { 2322 source = bs->backing_hd; 2323 if (!source) { 2324 sync = MIRROR_SYNC_MODE_FULL; 2325 } 2326 } 2327 if (sync == MIRROR_SYNC_MODE_NONE) { 2328 source = bs; 2329 } 2330 2331 size = bdrv_getlength(bs); 2332 if (size < 0) { 2333 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2334 goto out; 2335 } 2336 2337 if (mode != NEW_IMAGE_MODE_EXISTING) { 2338 assert(format && drv); 2339 if (source) { 2340 bdrv_img_create(target, format, source->filename, 2341 source->drv->format_name, NULL, 2342 size, flags, &local_err, false); 2343 } else { 2344 bdrv_img_create(target, format, NULL, NULL, NULL, 2345 size, flags, &local_err, false); 2346 } 2347 } 2348 2349 if (local_err) { 2350 error_propagate(errp, local_err); 2351 goto out; 2352 } 2353 2354 target_bs = NULL; 2355 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2356 if (ret < 0) { 2357 error_propagate(errp, local_err); 2358 goto out; 2359 } 2360 2361 bdrv_set_aio_context(target_bs, aio_context); 2362 2363 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2364 block_job_cb, bs, &local_err); 2365 if (local_err != NULL) { 2366 bdrv_unref(target_bs); 2367 error_propagate(errp, local_err); 2368 goto out; 2369 } 2370 2371 out: 2372 aio_context_release(aio_context); 2373 } 2374 2375 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2376 { 2377 return bdrv_named_nodes_list(); 2378 } 2379 2380 void qmp_blockdev_backup(const char *device, const char *target, 2381 enum MirrorSyncMode sync, 2382 bool has_speed, int64_t speed, 2383 bool has_on_source_error, 2384 BlockdevOnError on_source_error, 2385 bool has_on_target_error, 2386 BlockdevOnError on_target_error, 2387 Error **errp) 2388 { 2389 BlockDriverState *bs; 2390 BlockDriverState *target_bs; 2391 Error *local_err = NULL; 2392 AioContext *aio_context; 2393 2394 if (!has_speed) { 2395 speed = 0; 2396 } 2397 if (!has_on_source_error) { 2398 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2399 } 2400 if (!has_on_target_error) { 2401 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2402 } 2403 2404 bs = bdrv_find(device); 2405 if (!bs) { 2406 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2407 return; 2408 } 2409 2410 aio_context = bdrv_get_aio_context(bs); 2411 aio_context_acquire(aio_context); 2412 2413 target_bs = bdrv_find(target); 2414 if (!target_bs) { 2415 error_set(errp, QERR_DEVICE_NOT_FOUND, target); 2416 goto out; 2417 } 2418 2419 bdrv_ref(target_bs); 2420 bdrv_set_aio_context(target_bs, aio_context); 2421 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2422 block_job_cb, bs, &local_err); 2423 if (local_err != NULL) { 2424 bdrv_unref(target_bs); 2425 error_propagate(errp, local_err); 2426 } 2427 out: 2428 aio_context_release(aio_context); 2429 } 2430 2431 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2432 2433 void qmp_drive_mirror(const char *device, const char *target, 2434 bool has_format, const char *format, 2435 bool has_node_name, const char *node_name, 2436 bool has_replaces, const char *replaces, 2437 enum MirrorSyncMode sync, 2438 bool has_mode, enum NewImageMode mode, 2439 bool has_speed, int64_t speed, 2440 bool has_granularity, uint32_t granularity, 2441 bool has_buf_size, int64_t buf_size, 2442 bool has_on_source_error, BlockdevOnError on_source_error, 2443 bool has_on_target_error, BlockdevOnError on_target_error, 2444 Error **errp) 2445 { 2446 BlockDriverState *bs; 2447 BlockDriverState *source, *target_bs; 2448 AioContext *aio_context; 2449 BlockDriver *drv = NULL; 2450 Error *local_err = NULL; 2451 QDict *options = NULL; 2452 int flags; 2453 int64_t size; 2454 int ret; 2455 2456 if (!has_speed) { 2457 speed = 0; 2458 } 2459 if (!has_on_source_error) { 2460 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2461 } 2462 if (!has_on_target_error) { 2463 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2464 } 2465 if (!has_mode) { 2466 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2467 } 2468 if (!has_granularity) { 2469 granularity = 0; 2470 } 2471 if (!has_buf_size) { 2472 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2473 } 2474 2475 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2476 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2477 "a value in range [512B, 64MB]"); 2478 return; 2479 } 2480 if (granularity & (granularity - 1)) { 2481 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2482 return; 2483 } 2484 2485 bs = bdrv_find(device); 2486 if (!bs) { 2487 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2488 return; 2489 } 2490 2491 aio_context = bdrv_get_aio_context(bs); 2492 aio_context_acquire(aio_context); 2493 2494 if (!bdrv_is_inserted(bs)) { 2495 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2496 goto out; 2497 } 2498 2499 if (!has_format) { 2500 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2501 } 2502 if (format) { 2503 drv = bdrv_find_format(format); 2504 if (!drv) { 2505 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2506 goto out; 2507 } 2508 } 2509 2510 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2511 goto out; 2512 } 2513 2514 flags = bs->open_flags | BDRV_O_RDWR; 2515 source = bs->backing_hd; 2516 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2517 sync = MIRROR_SYNC_MODE_FULL; 2518 } 2519 if (sync == MIRROR_SYNC_MODE_NONE) { 2520 source = bs; 2521 } 2522 2523 size = bdrv_getlength(bs); 2524 if (size < 0) { 2525 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2526 goto out; 2527 } 2528 2529 if (has_replaces) { 2530 BlockDriverState *to_replace_bs; 2531 AioContext *replace_aio_context; 2532 int64_t replace_size; 2533 2534 if (!has_node_name) { 2535 error_setg(errp, "a node-name must be provided when replacing a" 2536 " named node of the graph"); 2537 goto out; 2538 } 2539 2540 to_replace_bs = check_to_replace_node(replaces, &local_err); 2541 2542 if (!to_replace_bs) { 2543 error_propagate(errp, local_err); 2544 goto out; 2545 } 2546 2547 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2548 aio_context_acquire(replace_aio_context); 2549 replace_size = bdrv_getlength(to_replace_bs); 2550 aio_context_release(replace_aio_context); 2551 2552 if (size != replace_size) { 2553 error_setg(errp, "cannot replace image with a mirror image of " 2554 "different size"); 2555 goto out; 2556 } 2557 } 2558 2559 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2560 && mode != NEW_IMAGE_MODE_EXISTING) 2561 { 2562 /* create new image w/o backing file */ 2563 assert(format && drv); 2564 bdrv_img_create(target, format, 2565 NULL, NULL, NULL, size, flags, &local_err, false); 2566 } else { 2567 switch (mode) { 2568 case NEW_IMAGE_MODE_EXISTING: 2569 break; 2570 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2571 /* create new image with backing file */ 2572 bdrv_img_create(target, format, 2573 source->filename, 2574 source->drv->format_name, 2575 NULL, size, flags, &local_err, false); 2576 break; 2577 default: 2578 abort(); 2579 } 2580 } 2581 2582 if (local_err) { 2583 error_propagate(errp, local_err); 2584 goto out; 2585 } 2586 2587 if (has_node_name) { 2588 options = qdict_new(); 2589 qdict_put(options, "node-name", qstring_from_str(node_name)); 2590 } 2591 2592 /* Mirroring takes care of copy-on-write using the source's backing 2593 * file. 2594 */ 2595 target_bs = NULL; 2596 ret = bdrv_open(&target_bs, target, NULL, options, 2597 flags | BDRV_O_NO_BACKING, drv, &local_err); 2598 if (ret < 0) { 2599 error_propagate(errp, local_err); 2600 goto out; 2601 } 2602 2603 bdrv_set_aio_context(target_bs, aio_context); 2604 2605 /* pass the node name to replace to mirror start since it's loose coupling 2606 * and will allow to check whether the node still exist at mirror completion 2607 */ 2608 mirror_start(bs, target_bs, 2609 has_replaces ? replaces : NULL, 2610 speed, granularity, buf_size, sync, 2611 on_source_error, on_target_error, 2612 block_job_cb, bs, &local_err); 2613 if (local_err != NULL) { 2614 bdrv_unref(target_bs); 2615 error_propagate(errp, local_err); 2616 goto out; 2617 } 2618 2619 out: 2620 aio_context_release(aio_context); 2621 } 2622 2623 /* Get the block job for a given device name and acquire its AioContext */ 2624 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2625 Error **errp) 2626 { 2627 BlockDriverState *bs; 2628 2629 bs = bdrv_find(device); 2630 if (!bs) { 2631 goto notfound; 2632 } 2633 2634 *aio_context = bdrv_get_aio_context(bs); 2635 aio_context_acquire(*aio_context); 2636 2637 if (!bs->job) { 2638 aio_context_release(*aio_context); 2639 goto notfound; 2640 } 2641 2642 return bs->job; 2643 2644 notfound: 2645 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2646 "No active block job on device '%s'", device); 2647 *aio_context = NULL; 2648 return NULL; 2649 } 2650 2651 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2652 { 2653 AioContext *aio_context; 2654 BlockJob *job = find_block_job(device, &aio_context, errp); 2655 2656 if (!job) { 2657 return; 2658 } 2659 2660 block_job_set_speed(job, speed, errp); 2661 aio_context_release(aio_context); 2662 } 2663 2664 void qmp_block_job_cancel(const char *device, 2665 bool has_force, bool force, Error **errp) 2666 { 2667 AioContext *aio_context; 2668 BlockJob *job = find_block_job(device, &aio_context, errp); 2669 2670 if (!job) { 2671 return; 2672 } 2673 2674 if (!has_force) { 2675 force = false; 2676 } 2677 2678 if (job->paused && !force) { 2679 error_setg(errp, "The block job for device '%s' is currently paused", 2680 device); 2681 goto out; 2682 } 2683 2684 trace_qmp_block_job_cancel(job); 2685 block_job_cancel(job); 2686 out: 2687 aio_context_release(aio_context); 2688 } 2689 2690 void qmp_block_job_pause(const char *device, Error **errp) 2691 { 2692 AioContext *aio_context; 2693 BlockJob *job = find_block_job(device, &aio_context, errp); 2694 2695 if (!job) { 2696 return; 2697 } 2698 2699 trace_qmp_block_job_pause(job); 2700 block_job_pause(job); 2701 aio_context_release(aio_context); 2702 } 2703 2704 void qmp_block_job_resume(const char *device, Error **errp) 2705 { 2706 AioContext *aio_context; 2707 BlockJob *job = find_block_job(device, &aio_context, errp); 2708 2709 if (!job) { 2710 return; 2711 } 2712 2713 trace_qmp_block_job_resume(job); 2714 block_job_resume(job); 2715 aio_context_release(aio_context); 2716 } 2717 2718 void qmp_block_job_complete(const char *device, Error **errp) 2719 { 2720 AioContext *aio_context; 2721 BlockJob *job = find_block_job(device, &aio_context, errp); 2722 2723 if (!job) { 2724 return; 2725 } 2726 2727 trace_qmp_block_job_complete(job); 2728 block_job_complete(job, errp); 2729 aio_context_release(aio_context); 2730 } 2731 2732 void qmp_change_backing_file(const char *device, 2733 const char *image_node_name, 2734 const char *backing_file, 2735 Error **errp) 2736 { 2737 BlockDriverState *bs = NULL; 2738 AioContext *aio_context; 2739 BlockDriverState *image_bs = NULL; 2740 Error *local_err = NULL; 2741 bool ro; 2742 int open_flags; 2743 int ret; 2744 2745 /* find the top layer BDS of the chain */ 2746 bs = bdrv_find(device); 2747 if (!bs) { 2748 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2749 return; 2750 } 2751 2752 aio_context = bdrv_get_aio_context(bs); 2753 aio_context_acquire(aio_context); 2754 2755 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2756 if (local_err) { 2757 error_propagate(errp, local_err); 2758 goto out; 2759 } 2760 2761 if (!image_bs) { 2762 error_setg(errp, "image file not found"); 2763 goto out; 2764 } 2765 2766 if (bdrv_find_base(image_bs) == image_bs) { 2767 error_setg(errp, "not allowing backing file change on an image " 2768 "without a backing file"); 2769 goto out; 2770 } 2771 2772 /* even though we are not necessarily operating on bs, we need it to 2773 * determine if block ops are currently prohibited on the chain */ 2774 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2775 goto out; 2776 } 2777 2778 /* final sanity check */ 2779 if (!bdrv_chain_contains(bs, image_bs)) { 2780 error_setg(errp, "'%s' and image file are not in the same chain", 2781 device); 2782 goto out; 2783 } 2784 2785 /* if not r/w, reopen to make r/w */ 2786 open_flags = image_bs->open_flags; 2787 ro = bdrv_is_read_only(image_bs); 2788 2789 if (ro) { 2790 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2791 if (local_err) { 2792 error_propagate(errp, local_err); 2793 goto out; 2794 } 2795 } 2796 2797 ret = bdrv_change_backing_file(image_bs, backing_file, 2798 image_bs->drv ? image_bs->drv->format_name : ""); 2799 2800 if (ret < 0) { 2801 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2802 backing_file); 2803 /* don't exit here, so we can try to restore open flags if 2804 * appropriate */ 2805 } 2806 2807 if (ro) { 2808 bdrv_reopen(image_bs, open_flags, &local_err); 2809 if (local_err) { 2810 error_propagate(errp, local_err); /* will preserve prior errp */ 2811 } 2812 } 2813 2814 out: 2815 aio_context_release(aio_context); 2816 } 2817 2818 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2819 { 2820 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2821 BlockBackend *blk; 2822 QObject *obj; 2823 QDict *qdict; 2824 Error *local_err = NULL; 2825 2826 /* Require an ID in the top level */ 2827 if (!options->has_id) { 2828 error_setg(errp, "Block device needs an ID"); 2829 goto fail; 2830 } 2831 2832 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2833 * cache.direct=false instead of silently switching to aio=threads, except 2834 * when called from drive_new(). 2835 * 2836 * For now, simply forbidding the combination for all drivers will do. */ 2837 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2838 bool direct = options->has_cache && 2839 options->cache->has_direct && 2840 options->cache->direct; 2841 if (!direct) { 2842 error_setg(errp, "aio=native requires cache.direct=true"); 2843 goto fail; 2844 } 2845 } 2846 2847 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2848 &options, NULL, &local_err); 2849 if (local_err) { 2850 error_propagate(errp, local_err); 2851 goto fail; 2852 } 2853 2854 obj = qmp_output_get_qobject(ov); 2855 qdict = qobject_to_qdict(obj); 2856 2857 qdict_flatten(qdict); 2858 2859 blk = blockdev_init(NULL, qdict, &local_err); 2860 if (local_err) { 2861 error_propagate(errp, local_err); 2862 goto fail; 2863 } 2864 2865 if (bdrv_key_required(blk_bs(blk))) { 2866 blk_unref(blk); 2867 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2868 goto fail; 2869 } 2870 2871 fail: 2872 qmp_output_visitor_cleanup(ov); 2873 } 2874 2875 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2876 { 2877 BlockJobInfoList *head = NULL, **p_next = &head; 2878 BlockDriverState *bs; 2879 2880 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 2881 AioContext *aio_context = bdrv_get_aio_context(bs); 2882 2883 aio_context_acquire(aio_context); 2884 2885 if (bs->job) { 2886 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2887 elem->value = block_job_query(bs->job); 2888 *p_next = elem; 2889 p_next = &elem->next; 2890 } 2891 2892 aio_context_release(aio_context); 2893 } 2894 2895 return head; 2896 } 2897 2898 QemuOptsList qemu_common_drive_opts = { 2899 .name = "drive", 2900 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2901 .desc = { 2902 { 2903 .name = "snapshot", 2904 .type = QEMU_OPT_BOOL, 2905 .help = "enable/disable snapshot mode", 2906 },{ 2907 .name = "discard", 2908 .type = QEMU_OPT_STRING, 2909 .help = "discard operation (ignore/off, unmap/on)", 2910 },{ 2911 .name = "cache.writeback", 2912 .type = QEMU_OPT_BOOL, 2913 .help = "enables writeback mode for any caches", 2914 },{ 2915 .name = "cache.direct", 2916 .type = QEMU_OPT_BOOL, 2917 .help = "enables use of O_DIRECT (bypass the host page cache)", 2918 },{ 2919 .name = "cache.no-flush", 2920 .type = QEMU_OPT_BOOL, 2921 .help = "ignore any flush requests for the device", 2922 },{ 2923 .name = "aio", 2924 .type = QEMU_OPT_STRING, 2925 .help = "host AIO implementation (threads, native)", 2926 },{ 2927 .name = "format", 2928 .type = QEMU_OPT_STRING, 2929 .help = "disk format (raw, qcow2, ...)", 2930 },{ 2931 .name = "rerror", 2932 .type = QEMU_OPT_STRING, 2933 .help = "read error action", 2934 },{ 2935 .name = "werror", 2936 .type = QEMU_OPT_STRING, 2937 .help = "write error action", 2938 },{ 2939 .name = "read-only", 2940 .type = QEMU_OPT_BOOL, 2941 .help = "open drive file as read-only", 2942 },{ 2943 .name = "throttling.iops-total", 2944 .type = QEMU_OPT_NUMBER, 2945 .help = "limit total I/O operations per second", 2946 },{ 2947 .name = "throttling.iops-read", 2948 .type = QEMU_OPT_NUMBER, 2949 .help = "limit read operations per second", 2950 },{ 2951 .name = "throttling.iops-write", 2952 .type = QEMU_OPT_NUMBER, 2953 .help = "limit write operations per second", 2954 },{ 2955 .name = "throttling.bps-total", 2956 .type = QEMU_OPT_NUMBER, 2957 .help = "limit total bytes per second", 2958 },{ 2959 .name = "throttling.bps-read", 2960 .type = QEMU_OPT_NUMBER, 2961 .help = "limit read bytes per second", 2962 },{ 2963 .name = "throttling.bps-write", 2964 .type = QEMU_OPT_NUMBER, 2965 .help = "limit write bytes per second", 2966 },{ 2967 .name = "throttling.iops-total-max", 2968 .type = QEMU_OPT_NUMBER, 2969 .help = "I/O operations burst", 2970 },{ 2971 .name = "throttling.iops-read-max", 2972 .type = QEMU_OPT_NUMBER, 2973 .help = "I/O operations read burst", 2974 },{ 2975 .name = "throttling.iops-write-max", 2976 .type = QEMU_OPT_NUMBER, 2977 .help = "I/O operations write burst", 2978 },{ 2979 .name = "throttling.bps-total-max", 2980 .type = QEMU_OPT_NUMBER, 2981 .help = "total bytes burst", 2982 },{ 2983 .name = "throttling.bps-read-max", 2984 .type = QEMU_OPT_NUMBER, 2985 .help = "total bytes read burst", 2986 },{ 2987 .name = "throttling.bps-write-max", 2988 .type = QEMU_OPT_NUMBER, 2989 .help = "total bytes write burst", 2990 },{ 2991 .name = "throttling.iops-size", 2992 .type = QEMU_OPT_NUMBER, 2993 .help = "when limiting by iops max size of an I/O in bytes", 2994 },{ 2995 .name = "copy-on-read", 2996 .type = QEMU_OPT_BOOL, 2997 .help = "copy read data from backing file into image file", 2998 },{ 2999 .name = "detect-zeroes", 3000 .type = QEMU_OPT_STRING, 3001 .help = "try to optimize zero writes (off, on, unmap)", 3002 }, 3003 { /* end of list */ } 3004 }, 3005 }; 3006 3007 QemuOptsList qemu_drive_opts = { 3008 .name = "drive", 3009 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3010 .desc = { 3011 /* 3012 * no elements => accept any params 3013 * validation will happen later 3014 */ 3015 { /* end of list */ } 3016 }, 3017 }; 3018