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; 183 184 opts = drive_def(optstr); 185 if (!opts) { 186 return NULL; 187 } 188 if (type != IF_DEFAULT) { 189 qemu_opt_set(opts, "if", if_name[type], &error_abort); 190 } 191 if (index >= 0) { 192 qemu_opt_set_number(opts, "index", index, &error_abort); 193 } 194 if (file) 195 qemu_opt_set(opts, "file", file, &error_abort); 196 return opts; 197 } 198 199 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 200 { 201 BlockBackend *blk; 202 DriveInfo *dinfo; 203 204 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 205 dinfo = blk_legacy_dinfo(blk); 206 if (dinfo && dinfo->type == type 207 && dinfo->bus == bus && dinfo->unit == unit) { 208 return dinfo; 209 } 210 } 211 212 return NULL; 213 } 214 215 bool drive_check_orphaned(void) 216 { 217 BlockBackend *blk; 218 DriveInfo *dinfo; 219 bool rs = false; 220 221 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 222 dinfo = blk_legacy_dinfo(blk); 223 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 224 /* Unless this is a default drive, this may be an oversight. */ 225 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 226 dinfo->type != IF_NONE) { 227 fprintf(stderr, "Warning: Orphaned drive without device: " 228 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 229 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 230 dinfo->bus, dinfo->unit); 231 rs = true; 232 } 233 } 234 235 return rs; 236 } 237 238 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 239 { 240 return drive_get(type, 241 drive_index_to_bus_id(type, index), 242 drive_index_to_unit_id(type, index)); 243 } 244 245 int drive_get_max_bus(BlockInterfaceType type) 246 { 247 int max_bus; 248 BlockBackend *blk; 249 DriveInfo *dinfo; 250 251 max_bus = -1; 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 255 max_bus = dinfo->bus; 256 } 257 } 258 return max_bus; 259 } 260 261 /* Get a block device. This should only be used for single-drive devices 262 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 263 appropriate bus. */ 264 DriveInfo *drive_get_next(BlockInterfaceType type) 265 { 266 static int next_block_unit[IF_COUNT]; 267 268 return drive_get(type, 0, next_block_unit[type]++); 269 } 270 271 static void bdrv_format_print(void *opaque, const char *name) 272 { 273 error_printf(" %s", name); 274 } 275 276 typedef struct { 277 QEMUBH *bh; 278 BlockDriverState *bs; 279 } BDRVPutRefBH; 280 281 static void bdrv_put_ref_bh(void *opaque) 282 { 283 BDRVPutRefBH *s = opaque; 284 285 bdrv_unref(s->bs); 286 qemu_bh_delete(s->bh); 287 g_free(s); 288 } 289 290 /* 291 * Release a BDS reference in a BH 292 * 293 * It is not safe to use bdrv_unref() from a callback function when the callers 294 * still need the BlockDriverState. In such cases we schedule a BH to release 295 * the reference. 296 */ 297 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 298 { 299 BDRVPutRefBH *s; 300 301 s = g_new(BDRVPutRefBH, 1); 302 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 303 s->bs = bs; 304 qemu_bh_schedule(s->bh); 305 } 306 307 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 308 { 309 if (!strcmp(buf, "ignore")) { 310 return BLOCKDEV_ON_ERROR_IGNORE; 311 } else if (!is_read && !strcmp(buf, "enospc")) { 312 return BLOCKDEV_ON_ERROR_ENOSPC; 313 } else if (!strcmp(buf, "stop")) { 314 return BLOCKDEV_ON_ERROR_STOP; 315 } else if (!strcmp(buf, "report")) { 316 return BLOCKDEV_ON_ERROR_REPORT; 317 } else { 318 error_setg(errp, "'%s' invalid %s error action", 319 buf, is_read ? "read" : "write"); 320 return -1; 321 } 322 } 323 324 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 325 { 326 if (throttle_conflicting(cfg)) { 327 error_setg(errp, "bps/iops/max total values and read/write values" 328 " cannot be used at the same time"); 329 return false; 330 } 331 332 if (!throttle_is_valid(cfg)) { 333 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 334 return false; 335 } 336 337 return true; 338 } 339 340 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 341 342 /* Takes the ownership of bs_opts */ 343 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 344 Error **errp) 345 { 346 const char *buf; 347 int ro = 0; 348 int bdrv_flags = 0; 349 int on_read_error, on_write_error; 350 BlockBackend *blk; 351 BlockDriverState *bs; 352 ThrottleConfig cfg; 353 int snapshot = 0; 354 bool copy_on_read; 355 Error *error = NULL; 356 QemuOpts *opts; 357 const char *id; 358 bool has_driver_specific_opts; 359 BlockdevDetectZeroesOptions detect_zeroes; 360 361 /* Check common options by copying from bs_opts to opts, all other options 362 * stay in bs_opts for processing by bdrv_open(). */ 363 id = qdict_get_try_str(bs_opts, "id"); 364 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 365 if (error) { 366 error_propagate(errp, error); 367 goto err_no_opts; 368 } 369 370 qemu_opts_absorb_qdict(opts, bs_opts, &error); 371 if (error) { 372 error_propagate(errp, error); 373 goto early_err; 374 } 375 376 if (id) { 377 qdict_del(bs_opts, "id"); 378 } 379 380 has_driver_specific_opts = !!qdict_size(bs_opts); 381 382 /* extract parameters */ 383 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 384 ro = qemu_opt_get_bool(opts, "read-only", 0); 385 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 386 387 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 388 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 389 error_setg(errp, "invalid discard option"); 390 goto early_err; 391 } 392 } 393 394 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 395 bdrv_flags |= BDRV_O_CACHE_WB; 396 } 397 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 398 bdrv_flags |= BDRV_O_NOCACHE; 399 } 400 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 401 bdrv_flags |= BDRV_O_NO_FLUSH; 402 } 403 404 #ifdef CONFIG_LINUX_AIO 405 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 406 if (!strcmp(buf, "native")) { 407 bdrv_flags |= BDRV_O_NATIVE_AIO; 408 } else if (!strcmp(buf, "threads")) { 409 /* this is the default */ 410 } else { 411 error_setg(errp, "invalid aio option"); 412 goto early_err; 413 } 414 } 415 #endif 416 417 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 418 if (is_help_option(buf)) { 419 error_printf("Supported formats:"); 420 bdrv_iterate_format(bdrv_format_print, NULL); 421 error_printf("\n"); 422 goto early_err; 423 } 424 425 if (qdict_haskey(bs_opts, "driver")) { 426 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 427 goto early_err; 428 } 429 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 430 } 431 432 /* disk I/O throttling */ 433 memset(&cfg, 0, sizeof(cfg)); 434 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 435 qemu_opt_get_number(opts, "throttling.bps-total", 0); 436 cfg.buckets[THROTTLE_BPS_READ].avg = 437 qemu_opt_get_number(opts, "throttling.bps-read", 0); 438 cfg.buckets[THROTTLE_BPS_WRITE].avg = 439 qemu_opt_get_number(opts, "throttling.bps-write", 0); 440 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 441 qemu_opt_get_number(opts, "throttling.iops-total", 0); 442 cfg.buckets[THROTTLE_OPS_READ].avg = 443 qemu_opt_get_number(opts, "throttling.iops-read", 0); 444 cfg.buckets[THROTTLE_OPS_WRITE].avg = 445 qemu_opt_get_number(opts, "throttling.iops-write", 0); 446 447 cfg.buckets[THROTTLE_BPS_TOTAL].max = 448 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 449 cfg.buckets[THROTTLE_BPS_READ].max = 450 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 451 cfg.buckets[THROTTLE_BPS_WRITE].max = 452 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 453 cfg.buckets[THROTTLE_OPS_TOTAL].max = 454 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 455 cfg.buckets[THROTTLE_OPS_READ].max = 456 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 457 cfg.buckets[THROTTLE_OPS_WRITE].max = 458 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 459 460 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 461 462 if (!check_throttle_config(&cfg, &error)) { 463 error_propagate(errp, error); 464 goto early_err; 465 } 466 467 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 468 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 469 on_write_error = parse_block_error_action(buf, 0, &error); 470 if (error) { 471 error_propagate(errp, error); 472 goto early_err; 473 } 474 } 475 476 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 477 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 478 on_read_error = parse_block_error_action(buf, 1, &error); 479 if (error) { 480 error_propagate(errp, error); 481 goto early_err; 482 } 483 } 484 485 detect_zeroes = 486 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 487 qemu_opt_get(opts, "detect-zeroes"), 488 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 489 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 490 &error); 491 if (error) { 492 error_propagate(errp, error); 493 goto early_err; 494 } 495 496 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 497 !(bdrv_flags & BDRV_O_UNMAP)) { 498 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 499 "without setting discard operation to unmap"); 500 goto early_err; 501 } 502 503 /* init */ 504 if ((!file || !*file) && !has_driver_specific_opts) { 505 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 506 if (!blk) { 507 goto early_err; 508 } 509 510 bs = blk_bs(blk); 511 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 512 bs->read_only = ro; 513 514 QDECREF(bs_opts); 515 } else { 516 if (file && !*file) { 517 file = NULL; 518 } 519 520 if (snapshot) { 521 /* always use cache=unsafe with snapshot */ 522 bdrv_flags &= ~BDRV_O_CACHE_MASK; 523 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 524 } 525 526 if (copy_on_read) { 527 bdrv_flags |= BDRV_O_COPY_ON_READ; 528 } 529 530 if (runstate_check(RUN_STATE_INMIGRATE)) { 531 bdrv_flags |= BDRV_O_INCOMING; 532 } 533 534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 535 536 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 537 errp); 538 if (!blk) { 539 goto err_no_bs_opts; 540 } 541 bs = blk_bs(blk); 542 } 543 544 bs->detect_zeroes = detect_zeroes; 545 546 bdrv_set_on_error(bs, on_read_error, on_write_error); 547 548 /* disk I/O throttling */ 549 if (throttle_enabled(&cfg)) { 550 bdrv_io_limits_enable(bs); 551 bdrv_set_io_limits(bs, &cfg); 552 } 553 554 if (bdrv_key_required(bs)) { 555 autostart = 0; 556 } 557 558 err_no_bs_opts: 559 qemu_opts_del(opts); 560 return blk; 561 562 early_err: 563 qemu_opts_del(opts); 564 err_no_opts: 565 QDECREF(bs_opts); 566 return NULL; 567 } 568 569 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 570 Error **errp) 571 { 572 const char *value; 573 574 value = qemu_opt_get(opts, from); 575 if (value) { 576 if (qemu_opt_find(opts, to)) { 577 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 578 "same time", to, from); 579 return; 580 } 581 } 582 583 /* rename all items in opts */ 584 while ((value = qemu_opt_get(opts, from))) { 585 qemu_opt_set(opts, to, value, &error_abort); 586 qemu_opt_unset(opts, from); 587 } 588 } 589 590 QemuOptsList qemu_legacy_drive_opts = { 591 .name = "drive", 592 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 593 .desc = { 594 { 595 .name = "bus", 596 .type = QEMU_OPT_NUMBER, 597 .help = "bus number", 598 },{ 599 .name = "unit", 600 .type = QEMU_OPT_NUMBER, 601 .help = "unit number (i.e. lun for scsi)", 602 },{ 603 .name = "index", 604 .type = QEMU_OPT_NUMBER, 605 .help = "index number", 606 },{ 607 .name = "media", 608 .type = QEMU_OPT_STRING, 609 .help = "media type (disk, cdrom)", 610 },{ 611 .name = "if", 612 .type = QEMU_OPT_STRING, 613 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 614 },{ 615 .name = "cyls", 616 .type = QEMU_OPT_NUMBER, 617 .help = "number of cylinders (ide disk geometry)", 618 },{ 619 .name = "heads", 620 .type = QEMU_OPT_NUMBER, 621 .help = "number of heads (ide disk geometry)", 622 },{ 623 .name = "secs", 624 .type = QEMU_OPT_NUMBER, 625 .help = "number of sectors (ide disk geometry)", 626 },{ 627 .name = "trans", 628 .type = QEMU_OPT_STRING, 629 .help = "chs translation (auto, lba, none)", 630 },{ 631 .name = "boot", 632 .type = QEMU_OPT_BOOL, 633 .help = "(deprecated, ignored)", 634 },{ 635 .name = "addr", 636 .type = QEMU_OPT_STRING, 637 .help = "pci address (virtio only)", 638 },{ 639 .name = "serial", 640 .type = QEMU_OPT_STRING, 641 .help = "disk serial number", 642 },{ 643 .name = "file", 644 .type = QEMU_OPT_STRING, 645 .help = "file name", 646 }, 647 648 /* Options that are passed on, but have special semantics with -drive */ 649 { 650 .name = "read-only", 651 .type = QEMU_OPT_BOOL, 652 .help = "open drive file as read-only", 653 },{ 654 .name = "rerror", 655 .type = QEMU_OPT_STRING, 656 .help = "read error action", 657 },{ 658 .name = "werror", 659 .type = QEMU_OPT_STRING, 660 .help = "write error action", 661 },{ 662 .name = "copy-on-read", 663 .type = QEMU_OPT_BOOL, 664 .help = "copy read data from backing file into image file", 665 }, 666 667 { /* end of list */ } 668 }, 669 }; 670 671 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 672 { 673 const char *value; 674 BlockBackend *blk; 675 DriveInfo *dinfo = NULL; 676 QDict *bs_opts; 677 QemuOpts *legacy_opts; 678 DriveMediaType media = MEDIA_DISK; 679 BlockInterfaceType type; 680 int cyls, heads, secs, translation; 681 int max_devs, bus_id, unit_id, index; 682 const char *devaddr; 683 const char *werror, *rerror; 684 bool read_only = false; 685 bool copy_on_read; 686 const char *serial; 687 const char *filename; 688 Error *local_err = NULL; 689 int i; 690 691 /* Change legacy command line options into QMP ones */ 692 static const struct { 693 const char *from; 694 const char *to; 695 } opt_renames[] = { 696 { "iops", "throttling.iops-total" }, 697 { "iops_rd", "throttling.iops-read" }, 698 { "iops_wr", "throttling.iops-write" }, 699 700 { "bps", "throttling.bps-total" }, 701 { "bps_rd", "throttling.bps-read" }, 702 { "bps_wr", "throttling.bps-write" }, 703 704 { "iops_max", "throttling.iops-total-max" }, 705 { "iops_rd_max", "throttling.iops-read-max" }, 706 { "iops_wr_max", "throttling.iops-write-max" }, 707 708 { "bps_max", "throttling.bps-total-max" }, 709 { "bps_rd_max", "throttling.bps-read-max" }, 710 { "bps_wr_max", "throttling.bps-write-max" }, 711 712 { "iops_size", "throttling.iops-size" }, 713 714 { "readonly", "read-only" }, 715 }; 716 717 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 718 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 719 &local_err); 720 if (local_err) { 721 error_report_err(local_err); 722 return NULL; 723 } 724 } 725 726 value = qemu_opt_get(all_opts, "cache"); 727 if (value) { 728 int flags = 0; 729 730 if (bdrv_parse_cache_flags(value, &flags) != 0) { 731 error_report("invalid cache option"); 732 return NULL; 733 } 734 735 /* Specific options take precedence */ 736 if (!qemu_opt_get(all_opts, "cache.writeback")) { 737 qemu_opt_set_bool(all_opts, "cache.writeback", 738 !!(flags & BDRV_O_CACHE_WB), &error_abort); 739 } 740 if (!qemu_opt_get(all_opts, "cache.direct")) { 741 qemu_opt_set_bool(all_opts, "cache.direct", 742 !!(flags & BDRV_O_NOCACHE), &error_abort); 743 } 744 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 745 qemu_opt_set_bool(all_opts, "cache.no-flush", 746 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 747 } 748 qemu_opt_unset(all_opts, "cache"); 749 } 750 751 /* Get a QDict for processing the options */ 752 bs_opts = qdict_new(); 753 qemu_opts_to_qdict(all_opts, bs_opts); 754 755 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 756 &error_abort); 757 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 758 if (local_err) { 759 error_report_err(local_err); 760 goto fail; 761 } 762 763 /* Deprecated option boot=[on|off] */ 764 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 765 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 766 "ignored. Future versions will reject this parameter. Please " 767 "update your scripts.\n"); 768 } 769 770 /* Media type */ 771 value = qemu_opt_get(legacy_opts, "media"); 772 if (value) { 773 if (!strcmp(value, "disk")) { 774 media = MEDIA_DISK; 775 } else if (!strcmp(value, "cdrom")) { 776 media = MEDIA_CDROM; 777 read_only = true; 778 } else { 779 error_report("'%s' invalid media", value); 780 goto fail; 781 } 782 } 783 784 /* copy-on-read is disabled with a warning for read-only devices */ 785 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 786 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 787 788 if (read_only && copy_on_read) { 789 error_report("warning: disabling copy-on-read on read-only drive"); 790 copy_on_read = false; 791 } 792 793 qdict_put(bs_opts, "read-only", 794 qstring_from_str(read_only ? "on" : "off")); 795 qdict_put(bs_opts, "copy-on-read", 796 qstring_from_str(copy_on_read ? "on" :"off")); 797 798 /* Controller type */ 799 value = qemu_opt_get(legacy_opts, "if"); 800 if (value) { 801 for (type = 0; 802 type < IF_COUNT && strcmp(value, if_name[type]); 803 type++) { 804 } 805 if (type == IF_COUNT) { 806 error_report("unsupported bus type '%s'", value); 807 goto fail; 808 } 809 } else { 810 type = block_default_type; 811 } 812 813 /* Geometry */ 814 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 815 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 816 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 817 818 if (cyls || heads || secs) { 819 if (cyls < 1) { 820 error_report("invalid physical cyls number"); 821 goto fail; 822 } 823 if (heads < 1) { 824 error_report("invalid physical heads number"); 825 goto fail; 826 } 827 if (secs < 1) { 828 error_report("invalid physical secs number"); 829 goto fail; 830 } 831 } 832 833 translation = BIOS_ATA_TRANSLATION_AUTO; 834 value = qemu_opt_get(legacy_opts, "trans"); 835 if (value != NULL) { 836 if (!cyls) { 837 error_report("'%s' trans must be used with cyls, heads and secs", 838 value); 839 goto fail; 840 } 841 if (!strcmp(value, "none")) { 842 translation = BIOS_ATA_TRANSLATION_NONE; 843 } else if (!strcmp(value, "lba")) { 844 translation = BIOS_ATA_TRANSLATION_LBA; 845 } else if (!strcmp(value, "large")) { 846 translation = BIOS_ATA_TRANSLATION_LARGE; 847 } else if (!strcmp(value, "rechs")) { 848 translation = BIOS_ATA_TRANSLATION_RECHS; 849 } else if (!strcmp(value, "auto")) { 850 translation = BIOS_ATA_TRANSLATION_AUTO; 851 } else { 852 error_report("'%s' invalid translation type", value); 853 goto fail; 854 } 855 } 856 857 if (media == MEDIA_CDROM) { 858 if (cyls || secs || heads) { 859 error_report("CHS can't be set with media=cdrom"); 860 goto fail; 861 } 862 } 863 864 /* Device address specified by bus/unit or index. 865 * If none was specified, try to find the first free one. */ 866 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 867 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 868 index = qemu_opt_get_number(legacy_opts, "index", -1); 869 870 max_devs = if_max_devs[type]; 871 872 if (index != -1) { 873 if (bus_id != 0 || unit_id != -1) { 874 error_report("index cannot be used with bus and unit"); 875 goto fail; 876 } 877 bus_id = drive_index_to_bus_id(type, index); 878 unit_id = drive_index_to_unit_id(type, index); 879 } 880 881 if (unit_id == -1) { 882 unit_id = 0; 883 while (drive_get(type, bus_id, unit_id) != NULL) { 884 unit_id++; 885 if (max_devs && unit_id >= max_devs) { 886 unit_id -= max_devs; 887 bus_id++; 888 } 889 } 890 } 891 892 if (max_devs && unit_id >= max_devs) { 893 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 894 goto fail; 895 } 896 897 if (drive_get(type, bus_id, unit_id) != NULL) { 898 error_report("drive with bus=%d, unit=%d (index=%d) exists", 899 bus_id, unit_id, index); 900 goto fail; 901 } 902 903 /* Serial number */ 904 serial = qemu_opt_get(legacy_opts, "serial"); 905 906 /* no id supplied -> create one */ 907 if (qemu_opts_id(all_opts) == NULL) { 908 char *new_id; 909 const char *mediastr = ""; 910 if (type == IF_IDE || type == IF_SCSI) { 911 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 912 } 913 if (max_devs) { 914 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 915 mediastr, unit_id); 916 } else { 917 new_id = g_strdup_printf("%s%s%i", if_name[type], 918 mediastr, unit_id); 919 } 920 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 921 g_free(new_id); 922 } 923 924 /* Add virtio block device */ 925 devaddr = qemu_opt_get(legacy_opts, "addr"); 926 if (devaddr && type != IF_VIRTIO) { 927 error_report("addr is not supported by this bus type"); 928 goto fail; 929 } 930 931 if (type == IF_VIRTIO) { 932 QemuOpts *devopts; 933 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 934 &error_abort); 935 if (arch_type == QEMU_ARCH_S390X) { 936 qemu_opt_set(devopts, "driver", "virtio-blk-s390", &error_abort); 937 } else { 938 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 939 } 940 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 941 &error_abort); 942 if (devaddr) { 943 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 944 } 945 } 946 947 filename = qemu_opt_get(legacy_opts, "file"); 948 949 /* Check werror/rerror compatibility with if=... */ 950 werror = qemu_opt_get(legacy_opts, "werror"); 951 if (werror != NULL) { 952 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 953 type != IF_NONE) { 954 error_report("werror is not supported by this bus type"); 955 goto fail; 956 } 957 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 958 } 959 960 rerror = qemu_opt_get(legacy_opts, "rerror"); 961 if (rerror != NULL) { 962 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 963 type != IF_NONE) { 964 error_report("rerror is not supported by this bus type"); 965 goto fail; 966 } 967 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 968 } 969 970 /* Actual block device init: Functionality shared with blockdev-add */ 971 blk = blockdev_init(filename, bs_opts, &local_err); 972 bs_opts = NULL; 973 if (!blk) { 974 if (local_err) { 975 error_report_err(local_err); 976 } 977 goto fail; 978 } else { 979 assert(!local_err); 980 } 981 982 /* Create legacy DriveInfo */ 983 dinfo = g_malloc0(sizeof(*dinfo)); 984 dinfo->opts = all_opts; 985 986 dinfo->cyls = cyls; 987 dinfo->heads = heads; 988 dinfo->secs = secs; 989 dinfo->trans = translation; 990 991 dinfo->type = type; 992 dinfo->bus = bus_id; 993 dinfo->unit = unit_id; 994 dinfo->devaddr = devaddr; 995 dinfo->serial = g_strdup(serial); 996 997 blk_set_legacy_dinfo(blk, dinfo); 998 999 switch(type) { 1000 case IF_IDE: 1001 case IF_SCSI: 1002 case IF_XEN: 1003 case IF_NONE: 1004 dinfo->media_cd = media == MEDIA_CDROM; 1005 break; 1006 default: 1007 break; 1008 } 1009 1010 fail: 1011 qemu_opts_del(legacy_opts); 1012 QDECREF(bs_opts); 1013 return dinfo; 1014 } 1015 1016 void hmp_commit(Monitor *mon, const QDict *qdict) 1017 { 1018 const char *device = qdict_get_str(qdict, "device"); 1019 BlockBackend *blk; 1020 int ret; 1021 1022 if (!strcmp(device, "all")) { 1023 ret = bdrv_commit_all(); 1024 } else { 1025 blk = blk_by_name(device); 1026 if (!blk) { 1027 monitor_printf(mon, "Device '%s' not found\n", device); 1028 return; 1029 } 1030 ret = bdrv_commit(blk_bs(blk)); 1031 } 1032 if (ret < 0) { 1033 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1034 strerror(-ret)); 1035 } 1036 } 1037 1038 static void blockdev_do_action(int kind, void *data, Error **errp) 1039 { 1040 TransactionAction action; 1041 TransactionActionList list; 1042 1043 action.kind = kind; 1044 action.data = data; 1045 list.value = &action; 1046 list.next = NULL; 1047 qmp_transaction(&list, errp); 1048 } 1049 1050 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1051 bool has_node_name, const char *node_name, 1052 const char *snapshot_file, 1053 bool has_snapshot_node_name, 1054 const char *snapshot_node_name, 1055 bool has_format, const char *format, 1056 bool has_mode, NewImageMode mode, Error **errp) 1057 { 1058 BlockdevSnapshot snapshot = { 1059 .has_device = has_device, 1060 .device = (char *) device, 1061 .has_node_name = has_node_name, 1062 .node_name = (char *) node_name, 1063 .snapshot_file = (char *) snapshot_file, 1064 .has_snapshot_node_name = has_snapshot_node_name, 1065 .snapshot_node_name = (char *) snapshot_node_name, 1066 .has_format = has_format, 1067 .format = (char *) format, 1068 .has_mode = has_mode, 1069 .mode = mode, 1070 }; 1071 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1072 &snapshot, errp); 1073 } 1074 1075 void qmp_blockdev_snapshot_internal_sync(const char *device, 1076 const char *name, 1077 Error **errp) 1078 { 1079 BlockdevSnapshotInternal snapshot = { 1080 .device = (char *) device, 1081 .name = (char *) name 1082 }; 1083 1084 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1085 &snapshot, errp); 1086 } 1087 1088 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1089 bool has_id, 1090 const char *id, 1091 bool has_name, 1092 const char *name, 1093 Error **errp) 1094 { 1095 BlockDriverState *bs; 1096 BlockBackend *blk; 1097 AioContext *aio_context; 1098 QEMUSnapshotInfo sn; 1099 Error *local_err = NULL; 1100 SnapshotInfo *info = NULL; 1101 int ret; 1102 1103 blk = blk_by_name(device); 1104 if (!blk) { 1105 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1106 return NULL; 1107 } 1108 bs = blk_bs(blk); 1109 1110 if (!has_id) { 1111 id = NULL; 1112 } 1113 1114 if (!has_name) { 1115 name = NULL; 1116 } 1117 1118 if (!id && !name) { 1119 error_setg(errp, "Name or id must be provided"); 1120 return NULL; 1121 } 1122 1123 aio_context = bdrv_get_aio_context(bs); 1124 aio_context_acquire(aio_context); 1125 1126 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1127 goto out_aio_context; 1128 } 1129 1130 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1131 if (local_err) { 1132 error_propagate(errp, local_err); 1133 goto out_aio_context; 1134 } 1135 if (!ret) { 1136 error_setg(errp, 1137 "Snapshot with id '%s' and name '%s' does not exist on " 1138 "device '%s'", 1139 STR_OR_NULL(id), STR_OR_NULL(name), device); 1140 goto out_aio_context; 1141 } 1142 1143 bdrv_snapshot_delete(bs, id, name, &local_err); 1144 if (local_err) { 1145 error_propagate(errp, local_err); 1146 goto out_aio_context; 1147 } 1148 1149 aio_context_release(aio_context); 1150 1151 info = g_new0(SnapshotInfo, 1); 1152 info->id = g_strdup(sn.id_str); 1153 info->name = g_strdup(sn.name); 1154 info->date_nsec = sn.date_nsec; 1155 info->date_sec = sn.date_sec; 1156 info->vm_state_size = sn.vm_state_size; 1157 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1158 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1159 1160 return info; 1161 1162 out_aio_context: 1163 aio_context_release(aio_context); 1164 return NULL; 1165 } 1166 1167 /* New and old BlockDriverState structs for atomic group operations */ 1168 1169 typedef struct BlkTransactionState BlkTransactionState; 1170 1171 /* Only prepare() may fail. In a single transaction, only one of commit() or 1172 abort() will be called, clean() will always be called if it present. */ 1173 typedef struct BdrvActionOps { 1174 /* Size of state struct, in bytes. */ 1175 size_t instance_size; 1176 /* Prepare the work, must NOT be NULL. */ 1177 void (*prepare)(BlkTransactionState *common, Error **errp); 1178 /* Commit the changes, can be NULL. */ 1179 void (*commit)(BlkTransactionState *common); 1180 /* Abort the changes on fail, can be NULL. */ 1181 void (*abort)(BlkTransactionState *common); 1182 /* Clean up resource in the end, can be NULL. */ 1183 void (*clean)(BlkTransactionState *common); 1184 } BdrvActionOps; 1185 1186 /* 1187 * This structure must be arranged as first member in child type, assuming 1188 * that compiler will also arrange it to the same address with parent instance. 1189 * Later it will be used in free(). 1190 */ 1191 struct BlkTransactionState { 1192 TransactionAction *action; 1193 const BdrvActionOps *ops; 1194 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1195 }; 1196 1197 /* internal snapshot private data */ 1198 typedef struct InternalSnapshotState { 1199 BlkTransactionState common; 1200 BlockDriverState *bs; 1201 AioContext *aio_context; 1202 QEMUSnapshotInfo sn; 1203 } InternalSnapshotState; 1204 1205 static void internal_snapshot_prepare(BlkTransactionState *common, 1206 Error **errp) 1207 { 1208 Error *local_err = NULL; 1209 const char *device; 1210 const char *name; 1211 BlockBackend *blk; 1212 BlockDriverState *bs; 1213 QEMUSnapshotInfo old_sn, *sn; 1214 bool ret; 1215 qemu_timeval tv; 1216 BlockdevSnapshotInternal *internal; 1217 InternalSnapshotState *state; 1218 int ret1; 1219 1220 g_assert(common->action->kind == 1221 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1222 internal = common->action->blockdev_snapshot_internal_sync; 1223 state = DO_UPCAST(InternalSnapshotState, common, common); 1224 1225 /* 1. parse input */ 1226 device = internal->device; 1227 name = internal->name; 1228 1229 /* 2. check for validation */ 1230 blk = blk_by_name(device); 1231 if (!blk) { 1232 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1233 return; 1234 } 1235 bs = blk_bs(blk); 1236 1237 /* AioContext is released in .clean() */ 1238 state->aio_context = bdrv_get_aio_context(bs); 1239 aio_context_acquire(state->aio_context); 1240 1241 if (!bdrv_is_inserted(bs)) { 1242 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1243 return; 1244 } 1245 1246 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1247 return; 1248 } 1249 1250 if (bdrv_is_read_only(bs)) { 1251 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1252 return; 1253 } 1254 1255 if (!bdrv_can_snapshot(bs)) { 1256 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1257 bs->drv->format_name, device, "internal snapshot"); 1258 return; 1259 } 1260 1261 if (!strlen(name)) { 1262 error_setg(errp, "Name is empty"); 1263 return; 1264 } 1265 1266 /* check whether a snapshot with name exist */ 1267 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1268 &local_err); 1269 if (local_err) { 1270 error_propagate(errp, local_err); 1271 return; 1272 } else if (ret) { 1273 error_setg(errp, 1274 "Snapshot with name '%s' already exists on device '%s'", 1275 name, device); 1276 return; 1277 } 1278 1279 /* 3. take the snapshot */ 1280 sn = &state->sn; 1281 pstrcpy(sn->name, sizeof(sn->name), name); 1282 qemu_gettimeofday(&tv); 1283 sn->date_sec = tv.tv_sec; 1284 sn->date_nsec = tv.tv_usec * 1000; 1285 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1286 1287 ret1 = bdrv_snapshot_create(bs, sn); 1288 if (ret1 < 0) { 1289 error_setg_errno(errp, -ret1, 1290 "Failed to create snapshot '%s' on device '%s'", 1291 name, device); 1292 return; 1293 } 1294 1295 /* 4. succeed, mark a snapshot is created */ 1296 state->bs = bs; 1297 } 1298 1299 static void internal_snapshot_abort(BlkTransactionState *common) 1300 { 1301 InternalSnapshotState *state = 1302 DO_UPCAST(InternalSnapshotState, common, common); 1303 BlockDriverState *bs = state->bs; 1304 QEMUSnapshotInfo *sn = &state->sn; 1305 Error *local_error = NULL; 1306 1307 if (!bs) { 1308 return; 1309 } 1310 1311 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1312 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1313 "device '%s' in abort: %s", 1314 sn->id_str, 1315 sn->name, 1316 bdrv_get_device_name(bs), 1317 error_get_pretty(local_error)); 1318 error_free(local_error); 1319 } 1320 } 1321 1322 static void internal_snapshot_clean(BlkTransactionState *common) 1323 { 1324 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1325 common, common); 1326 1327 if (state->aio_context) { 1328 aio_context_release(state->aio_context); 1329 } 1330 } 1331 1332 /* external snapshot private data */ 1333 typedef struct ExternalSnapshotState { 1334 BlkTransactionState common; 1335 BlockDriverState *old_bs; 1336 BlockDriverState *new_bs; 1337 AioContext *aio_context; 1338 } ExternalSnapshotState; 1339 1340 static void external_snapshot_prepare(BlkTransactionState *common, 1341 Error **errp) 1342 { 1343 BlockDriver *drv; 1344 int flags, ret; 1345 QDict *options = NULL; 1346 Error *local_err = NULL; 1347 bool has_device = false; 1348 const char *device; 1349 bool has_node_name = false; 1350 const char *node_name; 1351 bool has_snapshot_node_name = false; 1352 const char *snapshot_node_name; 1353 const char *new_image_file; 1354 const char *format = "qcow2"; 1355 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1356 ExternalSnapshotState *state = 1357 DO_UPCAST(ExternalSnapshotState, common, common); 1358 TransactionAction *action = common->action; 1359 1360 /* get parameters */ 1361 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1362 1363 has_device = action->blockdev_snapshot_sync->has_device; 1364 device = action->blockdev_snapshot_sync->device; 1365 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1366 node_name = action->blockdev_snapshot_sync->node_name; 1367 has_snapshot_node_name = 1368 action->blockdev_snapshot_sync->has_snapshot_node_name; 1369 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1370 1371 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1372 if (action->blockdev_snapshot_sync->has_format) { 1373 format = action->blockdev_snapshot_sync->format; 1374 } 1375 if (action->blockdev_snapshot_sync->has_mode) { 1376 mode = action->blockdev_snapshot_sync->mode; 1377 } 1378 1379 /* start processing */ 1380 drv = bdrv_find_format(format); 1381 if (!drv) { 1382 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1383 return; 1384 } 1385 1386 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1387 has_node_name ? node_name : NULL, 1388 &local_err); 1389 if (local_err) { 1390 error_propagate(errp, local_err); 1391 return; 1392 } 1393 1394 if (has_node_name && !has_snapshot_node_name) { 1395 error_setg(errp, "New snapshot node name missing"); 1396 return; 1397 } 1398 1399 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1400 error_setg(errp, "New snapshot node name already existing"); 1401 return; 1402 } 1403 1404 /* Acquire AioContext now so any threads operating on old_bs stop */ 1405 state->aio_context = bdrv_get_aio_context(state->old_bs); 1406 aio_context_acquire(state->aio_context); 1407 1408 if (!bdrv_is_inserted(state->old_bs)) { 1409 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1410 return; 1411 } 1412 1413 if (bdrv_op_is_blocked(state->old_bs, 1414 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1415 return; 1416 } 1417 1418 if (!bdrv_is_read_only(state->old_bs)) { 1419 if (bdrv_flush(state->old_bs)) { 1420 error_set(errp, QERR_IO_ERROR); 1421 return; 1422 } 1423 } 1424 1425 if (!bdrv_is_first_non_filter(state->old_bs)) { 1426 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1427 return; 1428 } 1429 1430 flags = state->old_bs->open_flags; 1431 1432 /* create new image w/backing file */ 1433 if (mode != NEW_IMAGE_MODE_EXISTING) { 1434 bdrv_img_create(new_image_file, format, 1435 state->old_bs->filename, 1436 state->old_bs->drv->format_name, 1437 NULL, -1, flags, &local_err, false); 1438 if (local_err) { 1439 error_propagate(errp, local_err); 1440 return; 1441 } 1442 } 1443 1444 if (has_snapshot_node_name) { 1445 options = qdict_new(); 1446 qdict_put(options, "node-name", 1447 qstring_from_str(snapshot_node_name)); 1448 } 1449 1450 /* TODO Inherit bs->options or only take explicit options with an 1451 * extended QMP command? */ 1452 assert(state->new_bs == NULL); 1453 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1454 flags | BDRV_O_NO_BACKING, drv, &local_err); 1455 /* We will manually add the backing_hd field to the bs later */ 1456 if (ret != 0) { 1457 error_propagate(errp, local_err); 1458 } 1459 } 1460 1461 static void external_snapshot_commit(BlkTransactionState *common) 1462 { 1463 ExternalSnapshotState *state = 1464 DO_UPCAST(ExternalSnapshotState, common, common); 1465 1466 bdrv_set_aio_context(state->new_bs, state->aio_context); 1467 1468 /* This removes our old bs and adds the new bs */ 1469 bdrv_append(state->new_bs, state->old_bs); 1470 /* We don't need (or want) to use the transactional 1471 * bdrv_reopen_multiple() across all the entries at once, because we 1472 * don't want to abort all of them if one of them fails the reopen */ 1473 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1474 NULL); 1475 1476 aio_context_release(state->aio_context); 1477 } 1478 1479 static void external_snapshot_abort(BlkTransactionState *common) 1480 { 1481 ExternalSnapshotState *state = 1482 DO_UPCAST(ExternalSnapshotState, common, common); 1483 if (state->new_bs) { 1484 bdrv_unref(state->new_bs); 1485 } 1486 if (state->aio_context) { 1487 aio_context_release(state->aio_context); 1488 } 1489 } 1490 1491 typedef struct DriveBackupState { 1492 BlkTransactionState common; 1493 BlockDriverState *bs; 1494 AioContext *aio_context; 1495 BlockJob *job; 1496 } DriveBackupState; 1497 1498 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1499 { 1500 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1501 BlockDriverState *bs; 1502 BlockBackend *blk; 1503 DriveBackup *backup; 1504 Error *local_err = NULL; 1505 1506 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1507 backup = common->action->drive_backup; 1508 1509 blk = blk_by_name(backup->device); 1510 if (!blk) { 1511 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1512 return; 1513 } 1514 bs = blk_bs(blk); 1515 1516 /* AioContext is released in .clean() */ 1517 state->aio_context = bdrv_get_aio_context(bs); 1518 aio_context_acquire(state->aio_context); 1519 1520 qmp_drive_backup(backup->device, backup->target, 1521 backup->has_format, backup->format, 1522 backup->sync, 1523 backup->has_mode, backup->mode, 1524 backup->has_speed, backup->speed, 1525 backup->has_on_source_error, backup->on_source_error, 1526 backup->has_on_target_error, backup->on_target_error, 1527 &local_err); 1528 if (local_err) { 1529 error_propagate(errp, local_err); 1530 return; 1531 } 1532 1533 state->bs = bs; 1534 state->job = state->bs->job; 1535 } 1536 1537 static void drive_backup_abort(BlkTransactionState *common) 1538 { 1539 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1540 BlockDriverState *bs = state->bs; 1541 1542 /* Only cancel if it's the job we started */ 1543 if (bs && bs->job && bs->job == state->job) { 1544 block_job_cancel_sync(bs->job); 1545 } 1546 } 1547 1548 static void drive_backup_clean(BlkTransactionState *common) 1549 { 1550 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1551 1552 if (state->aio_context) { 1553 aio_context_release(state->aio_context); 1554 } 1555 } 1556 1557 typedef struct BlockdevBackupState { 1558 BlkTransactionState common; 1559 BlockDriverState *bs; 1560 BlockJob *job; 1561 AioContext *aio_context; 1562 } BlockdevBackupState; 1563 1564 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1565 { 1566 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1567 BlockdevBackup *backup; 1568 BlockDriverState *bs, *target; 1569 BlockBackend *blk; 1570 Error *local_err = NULL; 1571 1572 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1573 backup = common->action->blockdev_backup; 1574 1575 blk = blk_by_name(backup->device); 1576 if (!blk) { 1577 error_setg(errp, "Device '%s' not found", backup->device); 1578 return; 1579 } 1580 bs = blk_bs(blk); 1581 1582 blk = blk_by_name(backup->target); 1583 if (!blk) { 1584 error_setg(errp, "Device '%s' not found", backup->target); 1585 return; 1586 } 1587 target = blk_bs(blk); 1588 1589 /* AioContext is released in .clean() */ 1590 state->aio_context = bdrv_get_aio_context(bs); 1591 if (state->aio_context != bdrv_get_aio_context(target)) { 1592 state->aio_context = NULL; 1593 error_setg(errp, "Backup between two IO threads is not implemented"); 1594 return; 1595 } 1596 aio_context_acquire(state->aio_context); 1597 1598 qmp_blockdev_backup(backup->device, backup->target, 1599 backup->sync, 1600 backup->has_speed, backup->speed, 1601 backup->has_on_source_error, backup->on_source_error, 1602 backup->has_on_target_error, backup->on_target_error, 1603 &local_err); 1604 if (local_err) { 1605 error_propagate(errp, local_err); 1606 return; 1607 } 1608 1609 state->bs = bs; 1610 state->job = state->bs->job; 1611 } 1612 1613 static void blockdev_backup_abort(BlkTransactionState *common) 1614 { 1615 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1616 BlockDriverState *bs = state->bs; 1617 1618 /* Only cancel if it's the job we started */ 1619 if (bs && bs->job && bs->job == state->job) { 1620 block_job_cancel_sync(bs->job); 1621 } 1622 } 1623 1624 static void blockdev_backup_clean(BlkTransactionState *common) 1625 { 1626 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1627 1628 if (state->aio_context) { 1629 aio_context_release(state->aio_context); 1630 } 1631 } 1632 1633 static void abort_prepare(BlkTransactionState *common, Error **errp) 1634 { 1635 error_setg(errp, "Transaction aborted using Abort action"); 1636 } 1637 1638 static void abort_commit(BlkTransactionState *common) 1639 { 1640 g_assert_not_reached(); /* this action never succeeds */ 1641 } 1642 1643 static const BdrvActionOps actions[] = { 1644 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1645 .instance_size = sizeof(ExternalSnapshotState), 1646 .prepare = external_snapshot_prepare, 1647 .commit = external_snapshot_commit, 1648 .abort = external_snapshot_abort, 1649 }, 1650 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1651 .instance_size = sizeof(DriveBackupState), 1652 .prepare = drive_backup_prepare, 1653 .abort = drive_backup_abort, 1654 .clean = drive_backup_clean, 1655 }, 1656 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1657 .instance_size = sizeof(BlockdevBackupState), 1658 .prepare = blockdev_backup_prepare, 1659 .abort = blockdev_backup_abort, 1660 .clean = blockdev_backup_clean, 1661 }, 1662 [TRANSACTION_ACTION_KIND_ABORT] = { 1663 .instance_size = sizeof(BlkTransactionState), 1664 .prepare = abort_prepare, 1665 .commit = abort_commit, 1666 }, 1667 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1668 .instance_size = sizeof(InternalSnapshotState), 1669 .prepare = internal_snapshot_prepare, 1670 .abort = internal_snapshot_abort, 1671 .clean = internal_snapshot_clean, 1672 }, 1673 }; 1674 1675 /* 1676 * 'Atomic' group operations. The operations are performed as a set, and if 1677 * any fail then we roll back all operations in the group. 1678 */ 1679 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1680 { 1681 TransactionActionList *dev_entry = dev_list; 1682 BlkTransactionState *state, *next; 1683 Error *local_err = NULL; 1684 1685 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1686 QSIMPLEQ_INIT(&snap_bdrv_states); 1687 1688 /* drain all i/o before any operations */ 1689 bdrv_drain_all(); 1690 1691 /* We don't do anything in this loop that commits us to the operations */ 1692 while (NULL != dev_entry) { 1693 TransactionAction *dev_info = NULL; 1694 const BdrvActionOps *ops; 1695 1696 dev_info = dev_entry->value; 1697 dev_entry = dev_entry->next; 1698 1699 assert(dev_info->kind < ARRAY_SIZE(actions)); 1700 1701 ops = &actions[dev_info->kind]; 1702 assert(ops->instance_size > 0); 1703 1704 state = g_malloc0(ops->instance_size); 1705 state->ops = ops; 1706 state->action = dev_info; 1707 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1708 1709 state->ops->prepare(state, &local_err); 1710 if (local_err) { 1711 error_propagate(errp, local_err); 1712 goto delete_and_fail; 1713 } 1714 } 1715 1716 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1717 if (state->ops->commit) { 1718 state->ops->commit(state); 1719 } 1720 } 1721 1722 /* success */ 1723 goto exit; 1724 1725 delete_and_fail: 1726 /* failure, and it is all-or-none; roll back all operations */ 1727 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1728 if (state->ops->abort) { 1729 state->ops->abort(state); 1730 } 1731 } 1732 exit: 1733 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1734 if (state->ops->clean) { 1735 state->ops->clean(state); 1736 } 1737 g_free(state); 1738 } 1739 } 1740 1741 1742 static void eject_device(BlockBackend *blk, int force, Error **errp) 1743 { 1744 BlockDriverState *bs = blk_bs(blk); 1745 AioContext *aio_context; 1746 1747 aio_context = bdrv_get_aio_context(bs); 1748 aio_context_acquire(aio_context); 1749 1750 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1751 goto out; 1752 } 1753 if (!blk_dev_has_removable_media(blk)) { 1754 error_setg(errp, "Device '%s' is not removable", 1755 bdrv_get_device_name(bs)); 1756 goto out; 1757 } 1758 1759 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1760 blk_dev_eject_request(blk, force); 1761 if (!force) { 1762 error_setg(errp, "Device '%s' is locked", 1763 bdrv_get_device_name(bs)); 1764 goto out; 1765 } 1766 } 1767 1768 bdrv_close(bs); 1769 1770 out: 1771 aio_context_release(aio_context); 1772 } 1773 1774 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1775 { 1776 BlockBackend *blk; 1777 1778 blk = blk_by_name(device); 1779 if (!blk) { 1780 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1781 return; 1782 } 1783 1784 eject_device(blk, force, errp); 1785 } 1786 1787 void qmp_block_passwd(bool has_device, const char *device, 1788 bool has_node_name, const char *node_name, 1789 const char *password, Error **errp) 1790 { 1791 Error *local_err = NULL; 1792 BlockDriverState *bs; 1793 AioContext *aio_context; 1794 1795 bs = bdrv_lookup_bs(has_device ? device : NULL, 1796 has_node_name ? node_name : NULL, 1797 &local_err); 1798 if (local_err) { 1799 error_propagate(errp, local_err); 1800 return; 1801 } 1802 1803 aio_context = bdrv_get_aio_context(bs); 1804 aio_context_acquire(aio_context); 1805 1806 bdrv_add_key(bs, password, errp); 1807 1808 aio_context_release(aio_context); 1809 } 1810 1811 /* Assumes AioContext is held */ 1812 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1813 int bdrv_flags, BlockDriver *drv, 1814 const char *password, Error **errp) 1815 { 1816 Error *local_err = NULL; 1817 int ret; 1818 1819 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1820 if (ret < 0) { 1821 error_propagate(errp, local_err); 1822 return; 1823 } 1824 1825 bdrv_add_key(bs, password, errp); 1826 } 1827 1828 void qmp_change_blockdev(const char *device, const char *filename, 1829 const char *format, Error **errp) 1830 { 1831 BlockBackend *blk; 1832 BlockDriverState *bs; 1833 AioContext *aio_context; 1834 BlockDriver *drv = NULL; 1835 int bdrv_flags; 1836 Error *err = NULL; 1837 1838 blk = blk_by_name(device); 1839 if (!blk) { 1840 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1841 return; 1842 } 1843 bs = blk_bs(blk); 1844 1845 aio_context = bdrv_get_aio_context(bs); 1846 aio_context_acquire(aio_context); 1847 1848 if (format) { 1849 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1850 if (!drv) { 1851 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1852 goto out; 1853 } 1854 } 1855 1856 eject_device(blk, 0, &err); 1857 if (err) { 1858 error_propagate(errp, err); 1859 goto out; 1860 } 1861 1862 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1863 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1864 1865 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1866 1867 out: 1868 aio_context_release(aio_context); 1869 } 1870 1871 /* throttling disk I/O limits */ 1872 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1873 int64_t bps_wr, 1874 int64_t iops, 1875 int64_t iops_rd, 1876 int64_t iops_wr, 1877 bool has_bps_max, 1878 int64_t bps_max, 1879 bool has_bps_rd_max, 1880 int64_t bps_rd_max, 1881 bool has_bps_wr_max, 1882 int64_t bps_wr_max, 1883 bool has_iops_max, 1884 int64_t iops_max, 1885 bool has_iops_rd_max, 1886 int64_t iops_rd_max, 1887 bool has_iops_wr_max, 1888 int64_t iops_wr_max, 1889 bool has_iops_size, 1890 int64_t iops_size, Error **errp) 1891 { 1892 ThrottleConfig cfg; 1893 BlockDriverState *bs; 1894 BlockBackend *blk; 1895 AioContext *aio_context; 1896 1897 blk = blk_by_name(device); 1898 if (!blk) { 1899 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1900 return; 1901 } 1902 bs = blk_bs(blk); 1903 1904 memset(&cfg, 0, sizeof(cfg)); 1905 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1906 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1907 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1908 1909 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1910 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1911 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1912 1913 if (has_bps_max) { 1914 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1915 } 1916 if (has_bps_rd_max) { 1917 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1918 } 1919 if (has_bps_wr_max) { 1920 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1921 } 1922 if (has_iops_max) { 1923 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1924 } 1925 if (has_iops_rd_max) { 1926 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1927 } 1928 if (has_iops_wr_max) { 1929 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1930 } 1931 1932 if (has_iops_size) { 1933 cfg.op_size = iops_size; 1934 } 1935 1936 if (!check_throttle_config(&cfg, errp)) { 1937 return; 1938 } 1939 1940 aio_context = bdrv_get_aio_context(bs); 1941 aio_context_acquire(aio_context); 1942 1943 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1944 bdrv_io_limits_enable(bs); 1945 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1946 bdrv_io_limits_disable(bs); 1947 } 1948 1949 if (bs->io_limits_enabled) { 1950 bdrv_set_io_limits(bs, &cfg); 1951 } 1952 1953 aio_context_release(aio_context); 1954 } 1955 1956 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1957 { 1958 const char *id = qdict_get_str(qdict, "id"); 1959 BlockBackend *blk; 1960 BlockDriverState *bs; 1961 AioContext *aio_context; 1962 Error *local_err = NULL; 1963 1964 blk = blk_by_name(id); 1965 if (!blk) { 1966 error_report("Device '%s' not found", id); 1967 return -1; 1968 } 1969 bs = blk_bs(blk); 1970 1971 if (!blk_legacy_dinfo(blk)) { 1972 error_report("Deleting device added with blockdev-add" 1973 " is not supported"); 1974 return -1; 1975 } 1976 1977 aio_context = bdrv_get_aio_context(bs); 1978 aio_context_acquire(aio_context); 1979 1980 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1981 error_report_err(local_err); 1982 aio_context_release(aio_context); 1983 return -1; 1984 } 1985 1986 /* quiesce block driver; prevent further io */ 1987 bdrv_drain_all(); 1988 bdrv_flush(bs); 1989 bdrv_close(bs); 1990 1991 /* if we have a device attached to this BlockDriverState 1992 * then we need to make the drive anonymous until the device 1993 * can be removed. If this is a drive with no device backing 1994 * then we can just get rid of the block driver state right here. 1995 */ 1996 if (blk_get_attached_dev(blk)) { 1997 blk_hide_on_behalf_of_hmp_drive_del(blk); 1998 /* Further I/O must not pause the guest */ 1999 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2000 BLOCKDEV_ON_ERROR_REPORT); 2001 } else { 2002 blk_unref(blk); 2003 } 2004 2005 aio_context_release(aio_context); 2006 return 0; 2007 } 2008 2009 void qmp_block_resize(bool has_device, const char *device, 2010 bool has_node_name, const char *node_name, 2011 int64_t size, Error **errp) 2012 { 2013 Error *local_err = NULL; 2014 BlockDriverState *bs; 2015 AioContext *aio_context; 2016 int ret; 2017 2018 bs = bdrv_lookup_bs(has_device ? device : NULL, 2019 has_node_name ? node_name : NULL, 2020 &local_err); 2021 if (local_err) { 2022 error_propagate(errp, local_err); 2023 return; 2024 } 2025 2026 aio_context = bdrv_get_aio_context(bs); 2027 aio_context_acquire(aio_context); 2028 2029 if (!bdrv_is_first_non_filter(bs)) { 2030 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2031 goto out; 2032 } 2033 2034 if (size < 0) { 2035 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2036 goto out; 2037 } 2038 2039 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2040 error_set(errp, QERR_DEVICE_IN_USE, device); 2041 goto out; 2042 } 2043 2044 /* complete all in-flight operations before resizing the device */ 2045 bdrv_drain_all(); 2046 2047 ret = bdrv_truncate(bs, size); 2048 switch (ret) { 2049 case 0: 2050 break; 2051 case -ENOMEDIUM: 2052 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2053 break; 2054 case -ENOTSUP: 2055 error_set(errp, QERR_UNSUPPORTED); 2056 break; 2057 case -EACCES: 2058 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 2059 break; 2060 case -EBUSY: 2061 error_set(errp, QERR_DEVICE_IN_USE, device); 2062 break; 2063 default: 2064 error_setg_errno(errp, -ret, "Could not resize"); 2065 break; 2066 } 2067 2068 out: 2069 aio_context_release(aio_context); 2070 } 2071 2072 static void block_job_cb(void *opaque, int ret) 2073 { 2074 /* Note that this function may be executed from another AioContext besides 2075 * the QEMU main loop. If you need to access anything that assumes the 2076 * QEMU global mutex, use a BH or introduce a mutex. 2077 */ 2078 2079 BlockDriverState *bs = opaque; 2080 const char *msg = NULL; 2081 2082 trace_block_job_cb(bs, bs->job, ret); 2083 2084 assert(bs->job); 2085 2086 if (ret < 0) { 2087 msg = strerror(-ret); 2088 } 2089 2090 if (block_job_is_cancelled(bs->job)) { 2091 block_job_event_cancelled(bs->job); 2092 } else { 2093 block_job_event_completed(bs->job, msg); 2094 } 2095 2096 bdrv_put_ref_bh_schedule(bs); 2097 } 2098 2099 void qmp_block_stream(const char *device, 2100 bool has_base, const char *base, 2101 bool has_backing_file, const char *backing_file, 2102 bool has_speed, int64_t speed, 2103 bool has_on_error, BlockdevOnError on_error, 2104 Error **errp) 2105 { 2106 BlockBackend *blk; 2107 BlockDriverState *bs; 2108 BlockDriverState *base_bs = NULL; 2109 AioContext *aio_context; 2110 Error *local_err = NULL; 2111 const char *base_name = NULL; 2112 2113 if (!has_on_error) { 2114 on_error = BLOCKDEV_ON_ERROR_REPORT; 2115 } 2116 2117 blk = blk_by_name(device); 2118 if (!blk) { 2119 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2120 return; 2121 } 2122 bs = blk_bs(blk); 2123 2124 aio_context = bdrv_get_aio_context(bs); 2125 aio_context_acquire(aio_context); 2126 2127 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2128 goto out; 2129 } 2130 2131 if (has_base) { 2132 base_bs = bdrv_find_backing_image(bs, base); 2133 if (base_bs == NULL) { 2134 error_set(errp, QERR_BASE_NOT_FOUND, base); 2135 goto out; 2136 } 2137 assert(bdrv_get_aio_context(base_bs) == aio_context); 2138 base_name = base; 2139 } 2140 2141 /* if we are streaming the entire chain, the result will have no backing 2142 * file, and specifying one is therefore an error */ 2143 if (base_bs == NULL && has_backing_file) { 2144 error_setg(errp, "backing file specified, but streaming the " 2145 "entire chain"); 2146 goto out; 2147 } 2148 2149 /* backing_file string overrides base bs filename */ 2150 base_name = has_backing_file ? backing_file : base_name; 2151 2152 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2153 on_error, block_job_cb, bs, &local_err); 2154 if (local_err) { 2155 error_propagate(errp, local_err); 2156 goto out; 2157 } 2158 2159 trace_qmp_block_stream(bs, bs->job); 2160 2161 out: 2162 aio_context_release(aio_context); 2163 } 2164 2165 void qmp_block_commit(const char *device, 2166 bool has_base, const char *base, 2167 bool has_top, const char *top, 2168 bool has_backing_file, const char *backing_file, 2169 bool has_speed, int64_t speed, 2170 Error **errp) 2171 { 2172 BlockBackend *blk; 2173 BlockDriverState *bs; 2174 BlockDriverState *base_bs, *top_bs; 2175 AioContext *aio_context; 2176 Error *local_err = NULL; 2177 /* This will be part of the QMP command, if/when the 2178 * BlockdevOnError change for blkmirror makes it in 2179 */ 2180 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2181 2182 if (!has_speed) { 2183 speed = 0; 2184 } 2185 2186 /* Important Note: 2187 * libvirt relies on the DeviceNotFound error class in order to probe for 2188 * live commit feature versions; for this to work, we must make sure to 2189 * perform the device lookup before any generic errors that may occur in a 2190 * scenario in which all optional arguments are omitted. */ 2191 blk = blk_by_name(device); 2192 if (!blk) { 2193 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2194 return; 2195 } 2196 bs = blk_bs(blk); 2197 2198 aio_context = bdrv_get_aio_context(bs); 2199 aio_context_acquire(aio_context); 2200 2201 /* drain all i/o before commits */ 2202 bdrv_drain_all(); 2203 2204 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2205 goto out; 2206 } 2207 2208 /* default top_bs is the active layer */ 2209 top_bs = bs; 2210 2211 if (has_top && top) { 2212 if (strcmp(bs->filename, top) != 0) { 2213 top_bs = bdrv_find_backing_image(bs, top); 2214 } 2215 } 2216 2217 if (top_bs == NULL) { 2218 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2219 goto out; 2220 } 2221 2222 assert(bdrv_get_aio_context(top_bs) == aio_context); 2223 2224 if (has_base && base) { 2225 base_bs = bdrv_find_backing_image(top_bs, base); 2226 } else { 2227 base_bs = bdrv_find_base(top_bs); 2228 } 2229 2230 if (base_bs == NULL) { 2231 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2232 goto out; 2233 } 2234 2235 assert(bdrv_get_aio_context(base_bs) == aio_context); 2236 2237 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2238 goto out; 2239 } 2240 2241 /* Do not allow attempts to commit an image into itself */ 2242 if (top_bs == base_bs) { 2243 error_setg(errp, "cannot commit an image into itself"); 2244 goto out; 2245 } 2246 2247 if (top_bs == bs) { 2248 if (has_backing_file) { 2249 error_setg(errp, "'backing-file' specified," 2250 " but 'top' is the active layer"); 2251 goto out; 2252 } 2253 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2254 bs, &local_err); 2255 } else { 2256 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2257 has_backing_file ? backing_file : NULL, &local_err); 2258 } 2259 if (local_err != NULL) { 2260 error_propagate(errp, local_err); 2261 goto out; 2262 } 2263 2264 out: 2265 aio_context_release(aio_context); 2266 } 2267 2268 void qmp_drive_backup(const char *device, const char *target, 2269 bool has_format, const char *format, 2270 enum MirrorSyncMode sync, 2271 bool has_mode, enum NewImageMode mode, 2272 bool has_speed, int64_t speed, 2273 bool has_on_source_error, BlockdevOnError on_source_error, 2274 bool has_on_target_error, BlockdevOnError on_target_error, 2275 Error **errp) 2276 { 2277 BlockBackend *blk; 2278 BlockDriverState *bs; 2279 BlockDriverState *target_bs; 2280 BlockDriverState *source = NULL; 2281 AioContext *aio_context; 2282 BlockDriver *drv = NULL; 2283 Error *local_err = NULL; 2284 int flags; 2285 int64_t size; 2286 int ret; 2287 2288 if (!has_speed) { 2289 speed = 0; 2290 } 2291 if (!has_on_source_error) { 2292 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2293 } 2294 if (!has_on_target_error) { 2295 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2296 } 2297 if (!has_mode) { 2298 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2299 } 2300 2301 blk = blk_by_name(device); 2302 if (!blk) { 2303 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2304 return; 2305 } 2306 bs = blk_bs(blk); 2307 2308 aio_context = bdrv_get_aio_context(bs); 2309 aio_context_acquire(aio_context); 2310 2311 /* Although backup_run has this check too, we need to use bs->drv below, so 2312 * do an early check redundantly. */ 2313 if (!bdrv_is_inserted(bs)) { 2314 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2315 goto out; 2316 } 2317 2318 if (!has_format) { 2319 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2320 } 2321 if (format) { 2322 drv = bdrv_find_format(format); 2323 if (!drv) { 2324 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2325 goto out; 2326 } 2327 } 2328 2329 /* Early check to avoid creating target */ 2330 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2331 goto out; 2332 } 2333 2334 flags = bs->open_flags | BDRV_O_RDWR; 2335 2336 /* See if we have a backing HD we can use to create our new image 2337 * on top of. */ 2338 if (sync == MIRROR_SYNC_MODE_TOP) { 2339 source = bs->backing_hd; 2340 if (!source) { 2341 sync = MIRROR_SYNC_MODE_FULL; 2342 } 2343 } 2344 if (sync == MIRROR_SYNC_MODE_NONE) { 2345 source = bs; 2346 } 2347 2348 size = bdrv_getlength(bs); 2349 if (size < 0) { 2350 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2351 goto out; 2352 } 2353 2354 if (mode != NEW_IMAGE_MODE_EXISTING) { 2355 assert(format && drv); 2356 if (source) { 2357 bdrv_img_create(target, format, source->filename, 2358 source->drv->format_name, NULL, 2359 size, flags, &local_err, false); 2360 } else { 2361 bdrv_img_create(target, format, NULL, NULL, NULL, 2362 size, flags, &local_err, false); 2363 } 2364 } 2365 2366 if (local_err) { 2367 error_propagate(errp, local_err); 2368 goto out; 2369 } 2370 2371 target_bs = NULL; 2372 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2373 if (ret < 0) { 2374 error_propagate(errp, local_err); 2375 goto out; 2376 } 2377 2378 bdrv_set_aio_context(target_bs, aio_context); 2379 2380 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2381 block_job_cb, bs, &local_err); 2382 if (local_err != NULL) { 2383 bdrv_unref(target_bs); 2384 error_propagate(errp, local_err); 2385 goto out; 2386 } 2387 2388 out: 2389 aio_context_release(aio_context); 2390 } 2391 2392 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2393 { 2394 return bdrv_named_nodes_list(); 2395 } 2396 2397 void qmp_blockdev_backup(const char *device, const char *target, 2398 enum MirrorSyncMode sync, 2399 bool has_speed, int64_t speed, 2400 bool has_on_source_error, 2401 BlockdevOnError on_source_error, 2402 bool has_on_target_error, 2403 BlockdevOnError on_target_error, 2404 Error **errp) 2405 { 2406 BlockBackend *blk; 2407 BlockDriverState *bs; 2408 BlockDriverState *target_bs; 2409 Error *local_err = NULL; 2410 AioContext *aio_context; 2411 2412 if (!has_speed) { 2413 speed = 0; 2414 } 2415 if (!has_on_source_error) { 2416 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2417 } 2418 if (!has_on_target_error) { 2419 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2420 } 2421 2422 blk = blk_by_name(device); 2423 if (!blk) { 2424 error_setg(errp, "Device '%s' not found", device); 2425 return; 2426 } 2427 bs = blk_bs(blk); 2428 2429 aio_context = bdrv_get_aio_context(bs); 2430 aio_context_acquire(aio_context); 2431 2432 blk = blk_by_name(target); 2433 if (!blk) { 2434 error_setg(errp, "Device '%s' not found", target); 2435 goto out; 2436 } 2437 target_bs = blk_bs(blk); 2438 2439 bdrv_ref(target_bs); 2440 bdrv_set_aio_context(target_bs, aio_context); 2441 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2442 block_job_cb, bs, &local_err); 2443 if (local_err != NULL) { 2444 bdrv_unref(target_bs); 2445 error_propagate(errp, local_err); 2446 } 2447 out: 2448 aio_context_release(aio_context); 2449 } 2450 2451 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2452 2453 void qmp_drive_mirror(const char *device, const char *target, 2454 bool has_format, const char *format, 2455 bool has_node_name, const char *node_name, 2456 bool has_replaces, const char *replaces, 2457 enum MirrorSyncMode sync, 2458 bool has_mode, enum NewImageMode mode, 2459 bool has_speed, int64_t speed, 2460 bool has_granularity, uint32_t granularity, 2461 bool has_buf_size, int64_t buf_size, 2462 bool has_on_source_error, BlockdevOnError on_source_error, 2463 bool has_on_target_error, BlockdevOnError on_target_error, 2464 Error **errp) 2465 { 2466 BlockBackend *blk; 2467 BlockDriverState *bs; 2468 BlockDriverState *source, *target_bs; 2469 AioContext *aio_context; 2470 BlockDriver *drv = NULL; 2471 Error *local_err = NULL; 2472 QDict *options = NULL; 2473 int flags; 2474 int64_t size; 2475 int ret; 2476 2477 if (!has_speed) { 2478 speed = 0; 2479 } 2480 if (!has_on_source_error) { 2481 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2482 } 2483 if (!has_on_target_error) { 2484 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2485 } 2486 if (!has_mode) { 2487 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2488 } 2489 if (!has_granularity) { 2490 granularity = 0; 2491 } 2492 if (!has_buf_size) { 2493 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2494 } 2495 2496 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2497 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2498 "a value in range [512B, 64MB]"); 2499 return; 2500 } 2501 if (granularity & (granularity - 1)) { 2502 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2503 return; 2504 } 2505 2506 blk = blk_by_name(device); 2507 if (!blk) { 2508 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2509 return; 2510 } 2511 bs = blk_bs(blk); 2512 2513 aio_context = bdrv_get_aio_context(bs); 2514 aio_context_acquire(aio_context); 2515 2516 if (!bdrv_is_inserted(bs)) { 2517 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2518 goto out; 2519 } 2520 2521 if (!has_format) { 2522 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2523 } 2524 if (format) { 2525 drv = bdrv_find_format(format); 2526 if (!drv) { 2527 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2528 goto out; 2529 } 2530 } 2531 2532 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2533 goto out; 2534 } 2535 2536 flags = bs->open_flags | BDRV_O_RDWR; 2537 source = bs->backing_hd; 2538 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2539 sync = MIRROR_SYNC_MODE_FULL; 2540 } 2541 if (sync == MIRROR_SYNC_MODE_NONE) { 2542 source = bs; 2543 } 2544 2545 size = bdrv_getlength(bs); 2546 if (size < 0) { 2547 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2548 goto out; 2549 } 2550 2551 if (has_replaces) { 2552 BlockDriverState *to_replace_bs; 2553 AioContext *replace_aio_context; 2554 int64_t replace_size; 2555 2556 if (!has_node_name) { 2557 error_setg(errp, "a node-name must be provided when replacing a" 2558 " named node of the graph"); 2559 goto out; 2560 } 2561 2562 to_replace_bs = check_to_replace_node(replaces, &local_err); 2563 2564 if (!to_replace_bs) { 2565 error_propagate(errp, local_err); 2566 goto out; 2567 } 2568 2569 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2570 aio_context_acquire(replace_aio_context); 2571 replace_size = bdrv_getlength(to_replace_bs); 2572 aio_context_release(replace_aio_context); 2573 2574 if (size != replace_size) { 2575 error_setg(errp, "cannot replace image with a mirror image of " 2576 "different size"); 2577 goto out; 2578 } 2579 } 2580 2581 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2582 && mode != NEW_IMAGE_MODE_EXISTING) 2583 { 2584 /* create new image w/o backing file */ 2585 assert(format && drv); 2586 bdrv_img_create(target, format, 2587 NULL, NULL, NULL, size, flags, &local_err, false); 2588 } else { 2589 switch (mode) { 2590 case NEW_IMAGE_MODE_EXISTING: 2591 break; 2592 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2593 /* create new image with backing file */ 2594 bdrv_img_create(target, format, 2595 source->filename, 2596 source->drv->format_name, 2597 NULL, size, flags, &local_err, false); 2598 break; 2599 default: 2600 abort(); 2601 } 2602 } 2603 2604 if (local_err) { 2605 error_propagate(errp, local_err); 2606 goto out; 2607 } 2608 2609 if (has_node_name) { 2610 options = qdict_new(); 2611 qdict_put(options, "node-name", qstring_from_str(node_name)); 2612 } 2613 2614 /* Mirroring takes care of copy-on-write using the source's backing 2615 * file. 2616 */ 2617 target_bs = NULL; 2618 ret = bdrv_open(&target_bs, target, NULL, options, 2619 flags | BDRV_O_NO_BACKING, drv, &local_err); 2620 if (ret < 0) { 2621 error_propagate(errp, local_err); 2622 goto out; 2623 } 2624 2625 bdrv_set_aio_context(target_bs, aio_context); 2626 2627 /* pass the node name to replace to mirror start since it's loose coupling 2628 * and will allow to check whether the node still exist at mirror completion 2629 */ 2630 mirror_start(bs, target_bs, 2631 has_replaces ? replaces : NULL, 2632 speed, granularity, buf_size, sync, 2633 on_source_error, on_target_error, 2634 block_job_cb, bs, &local_err); 2635 if (local_err != NULL) { 2636 bdrv_unref(target_bs); 2637 error_propagate(errp, local_err); 2638 goto out; 2639 } 2640 2641 out: 2642 aio_context_release(aio_context); 2643 } 2644 2645 /* Get the block job for a given device name and acquire its AioContext */ 2646 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2647 Error **errp) 2648 { 2649 BlockBackend *blk; 2650 BlockDriverState *bs; 2651 2652 blk = blk_by_name(device); 2653 if (!blk) { 2654 goto notfound; 2655 } 2656 bs = blk_bs(blk); 2657 2658 *aio_context = bdrv_get_aio_context(bs); 2659 aio_context_acquire(*aio_context); 2660 2661 if (!bs->job) { 2662 aio_context_release(*aio_context); 2663 goto notfound; 2664 } 2665 2666 return bs->job; 2667 2668 notfound: 2669 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2670 "No active block job on device '%s'", device); 2671 *aio_context = NULL; 2672 return NULL; 2673 } 2674 2675 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2676 { 2677 AioContext *aio_context; 2678 BlockJob *job = find_block_job(device, &aio_context, errp); 2679 2680 if (!job) { 2681 return; 2682 } 2683 2684 block_job_set_speed(job, speed, errp); 2685 aio_context_release(aio_context); 2686 } 2687 2688 void qmp_block_job_cancel(const char *device, 2689 bool has_force, bool force, Error **errp) 2690 { 2691 AioContext *aio_context; 2692 BlockJob *job = find_block_job(device, &aio_context, errp); 2693 2694 if (!job) { 2695 return; 2696 } 2697 2698 if (!has_force) { 2699 force = false; 2700 } 2701 2702 if (job->paused && !force) { 2703 error_setg(errp, "The block job for device '%s' is currently paused", 2704 device); 2705 goto out; 2706 } 2707 2708 trace_qmp_block_job_cancel(job); 2709 block_job_cancel(job); 2710 out: 2711 aio_context_release(aio_context); 2712 } 2713 2714 void qmp_block_job_pause(const char *device, Error **errp) 2715 { 2716 AioContext *aio_context; 2717 BlockJob *job = find_block_job(device, &aio_context, errp); 2718 2719 if (!job) { 2720 return; 2721 } 2722 2723 trace_qmp_block_job_pause(job); 2724 block_job_pause(job); 2725 aio_context_release(aio_context); 2726 } 2727 2728 void qmp_block_job_resume(const char *device, Error **errp) 2729 { 2730 AioContext *aio_context; 2731 BlockJob *job = find_block_job(device, &aio_context, errp); 2732 2733 if (!job) { 2734 return; 2735 } 2736 2737 trace_qmp_block_job_resume(job); 2738 block_job_resume(job); 2739 aio_context_release(aio_context); 2740 } 2741 2742 void qmp_block_job_complete(const char *device, Error **errp) 2743 { 2744 AioContext *aio_context; 2745 BlockJob *job = find_block_job(device, &aio_context, errp); 2746 2747 if (!job) { 2748 return; 2749 } 2750 2751 trace_qmp_block_job_complete(job); 2752 block_job_complete(job, errp); 2753 aio_context_release(aio_context); 2754 } 2755 2756 void qmp_change_backing_file(const char *device, 2757 const char *image_node_name, 2758 const char *backing_file, 2759 Error **errp) 2760 { 2761 BlockBackend *blk; 2762 BlockDriverState *bs = NULL; 2763 AioContext *aio_context; 2764 BlockDriverState *image_bs = NULL; 2765 Error *local_err = NULL; 2766 bool ro; 2767 int open_flags; 2768 int ret; 2769 2770 blk = blk_by_name(device); 2771 if (!blk) { 2772 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2773 return; 2774 } 2775 bs = blk_bs(blk); 2776 2777 aio_context = bdrv_get_aio_context(bs); 2778 aio_context_acquire(aio_context); 2779 2780 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2781 if (local_err) { 2782 error_propagate(errp, local_err); 2783 goto out; 2784 } 2785 2786 if (!image_bs) { 2787 error_setg(errp, "image file not found"); 2788 goto out; 2789 } 2790 2791 if (bdrv_find_base(image_bs) == image_bs) { 2792 error_setg(errp, "not allowing backing file change on an image " 2793 "without a backing file"); 2794 goto out; 2795 } 2796 2797 /* even though we are not necessarily operating on bs, we need it to 2798 * determine if block ops are currently prohibited on the chain */ 2799 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2800 goto out; 2801 } 2802 2803 /* final sanity check */ 2804 if (!bdrv_chain_contains(bs, image_bs)) { 2805 error_setg(errp, "'%s' and image file are not in the same chain", 2806 device); 2807 goto out; 2808 } 2809 2810 /* if not r/w, reopen to make r/w */ 2811 open_flags = image_bs->open_flags; 2812 ro = bdrv_is_read_only(image_bs); 2813 2814 if (ro) { 2815 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2816 if (local_err) { 2817 error_propagate(errp, local_err); 2818 goto out; 2819 } 2820 } 2821 2822 ret = bdrv_change_backing_file(image_bs, backing_file, 2823 image_bs->drv ? image_bs->drv->format_name : ""); 2824 2825 if (ret < 0) { 2826 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2827 backing_file); 2828 /* don't exit here, so we can try to restore open flags if 2829 * appropriate */ 2830 } 2831 2832 if (ro) { 2833 bdrv_reopen(image_bs, open_flags, &local_err); 2834 if (local_err) { 2835 error_propagate(errp, local_err); /* will preserve prior errp */ 2836 } 2837 } 2838 2839 out: 2840 aio_context_release(aio_context); 2841 } 2842 2843 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2844 { 2845 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2846 BlockBackend *blk; 2847 QObject *obj; 2848 QDict *qdict; 2849 Error *local_err = NULL; 2850 2851 /* Require an ID in the top level */ 2852 if (!options->has_id) { 2853 error_setg(errp, "Block device needs an ID"); 2854 goto fail; 2855 } 2856 2857 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2858 * cache.direct=false instead of silently switching to aio=threads, except 2859 * when called from drive_new(). 2860 * 2861 * For now, simply forbidding the combination for all drivers will do. */ 2862 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2863 bool direct = options->has_cache && 2864 options->cache->has_direct && 2865 options->cache->direct; 2866 if (!direct) { 2867 error_setg(errp, "aio=native requires cache.direct=true"); 2868 goto fail; 2869 } 2870 } 2871 2872 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2873 &options, NULL, &local_err); 2874 if (local_err) { 2875 error_propagate(errp, local_err); 2876 goto fail; 2877 } 2878 2879 obj = qmp_output_get_qobject(ov); 2880 qdict = qobject_to_qdict(obj); 2881 2882 qdict_flatten(qdict); 2883 2884 blk = blockdev_init(NULL, qdict, &local_err); 2885 if (local_err) { 2886 error_propagate(errp, local_err); 2887 goto fail; 2888 } 2889 2890 if (bdrv_key_required(blk_bs(blk))) { 2891 blk_unref(blk); 2892 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2893 goto fail; 2894 } 2895 2896 fail: 2897 qmp_output_visitor_cleanup(ov); 2898 } 2899 2900 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2901 { 2902 BlockJobInfoList *head = NULL, **p_next = &head; 2903 BlockDriverState *bs; 2904 2905 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 2906 AioContext *aio_context = bdrv_get_aio_context(bs); 2907 2908 aio_context_acquire(aio_context); 2909 2910 if (bs->job) { 2911 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2912 elem->value = block_job_query(bs->job); 2913 *p_next = elem; 2914 p_next = &elem->next; 2915 } 2916 2917 aio_context_release(aio_context); 2918 } 2919 2920 return head; 2921 } 2922 2923 QemuOptsList qemu_common_drive_opts = { 2924 .name = "drive", 2925 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2926 .desc = { 2927 { 2928 .name = "snapshot", 2929 .type = QEMU_OPT_BOOL, 2930 .help = "enable/disable snapshot mode", 2931 },{ 2932 .name = "discard", 2933 .type = QEMU_OPT_STRING, 2934 .help = "discard operation (ignore/off, unmap/on)", 2935 },{ 2936 .name = "cache.writeback", 2937 .type = QEMU_OPT_BOOL, 2938 .help = "enables writeback mode for any caches", 2939 },{ 2940 .name = "cache.direct", 2941 .type = QEMU_OPT_BOOL, 2942 .help = "enables use of O_DIRECT (bypass the host page cache)", 2943 },{ 2944 .name = "cache.no-flush", 2945 .type = QEMU_OPT_BOOL, 2946 .help = "ignore any flush requests for the device", 2947 },{ 2948 .name = "aio", 2949 .type = QEMU_OPT_STRING, 2950 .help = "host AIO implementation (threads, native)", 2951 },{ 2952 .name = "format", 2953 .type = QEMU_OPT_STRING, 2954 .help = "disk format (raw, qcow2, ...)", 2955 },{ 2956 .name = "rerror", 2957 .type = QEMU_OPT_STRING, 2958 .help = "read error action", 2959 },{ 2960 .name = "werror", 2961 .type = QEMU_OPT_STRING, 2962 .help = "write error action", 2963 },{ 2964 .name = "read-only", 2965 .type = QEMU_OPT_BOOL, 2966 .help = "open drive file as read-only", 2967 },{ 2968 .name = "throttling.iops-total", 2969 .type = QEMU_OPT_NUMBER, 2970 .help = "limit total I/O operations per second", 2971 },{ 2972 .name = "throttling.iops-read", 2973 .type = QEMU_OPT_NUMBER, 2974 .help = "limit read operations per second", 2975 },{ 2976 .name = "throttling.iops-write", 2977 .type = QEMU_OPT_NUMBER, 2978 .help = "limit write operations per second", 2979 },{ 2980 .name = "throttling.bps-total", 2981 .type = QEMU_OPT_NUMBER, 2982 .help = "limit total bytes per second", 2983 },{ 2984 .name = "throttling.bps-read", 2985 .type = QEMU_OPT_NUMBER, 2986 .help = "limit read bytes per second", 2987 },{ 2988 .name = "throttling.bps-write", 2989 .type = QEMU_OPT_NUMBER, 2990 .help = "limit write bytes per second", 2991 },{ 2992 .name = "throttling.iops-total-max", 2993 .type = QEMU_OPT_NUMBER, 2994 .help = "I/O operations burst", 2995 },{ 2996 .name = "throttling.iops-read-max", 2997 .type = QEMU_OPT_NUMBER, 2998 .help = "I/O operations read burst", 2999 },{ 3000 .name = "throttling.iops-write-max", 3001 .type = QEMU_OPT_NUMBER, 3002 .help = "I/O operations write burst", 3003 },{ 3004 .name = "throttling.bps-total-max", 3005 .type = QEMU_OPT_NUMBER, 3006 .help = "total bytes burst", 3007 },{ 3008 .name = "throttling.bps-read-max", 3009 .type = QEMU_OPT_NUMBER, 3010 .help = "total bytes read burst", 3011 },{ 3012 .name = "throttling.bps-write-max", 3013 .type = QEMU_OPT_NUMBER, 3014 .help = "total bytes write burst", 3015 },{ 3016 .name = "throttling.iops-size", 3017 .type = QEMU_OPT_NUMBER, 3018 .help = "when limiting by iops max size of an I/O in bytes", 3019 },{ 3020 .name = "copy-on-read", 3021 .type = QEMU_OPT_BOOL, 3022 .help = "copy read data from backing file into image file", 3023 },{ 3024 .name = "detect-zeroes", 3025 .type = QEMU_OPT_STRING, 3026 .help = "try to optimize zero writes (off, on, unmap)", 3027 }, 3028 { /* end of list */ } 3029 }, 3030 }; 3031 3032 QemuOptsList qemu_drive_opts = { 3033 .name = "drive", 3034 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3035 .desc = { 3036 /* 3037 * no elements => accept any params 3038 * validation will happen later 3039 */ 3040 { /* end of list */ } 3041 }, 3042 }; 3043