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_setg(errp, "Device '%s' is read only", device); 1252 return; 1253 } 1254 1255 if (!bdrv_can_snapshot(bs)) { 1256 error_setg(errp, "Block format '%s' used by device '%s' " 1257 "does not support internal snapshots", 1258 bs->drv->format_name, device); 1259 return; 1260 } 1261 1262 if (!strlen(name)) { 1263 error_setg(errp, "Name is empty"); 1264 return; 1265 } 1266 1267 /* check whether a snapshot with name exist */ 1268 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1269 &local_err); 1270 if (local_err) { 1271 error_propagate(errp, local_err); 1272 return; 1273 } else if (ret) { 1274 error_setg(errp, 1275 "Snapshot with name '%s' already exists on device '%s'", 1276 name, device); 1277 return; 1278 } 1279 1280 /* 3. take the snapshot */ 1281 sn = &state->sn; 1282 pstrcpy(sn->name, sizeof(sn->name), name); 1283 qemu_gettimeofday(&tv); 1284 sn->date_sec = tv.tv_sec; 1285 sn->date_nsec = tv.tv_usec * 1000; 1286 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1287 1288 ret1 = bdrv_snapshot_create(bs, sn); 1289 if (ret1 < 0) { 1290 error_setg_errno(errp, -ret1, 1291 "Failed to create snapshot '%s' on device '%s'", 1292 name, device); 1293 return; 1294 } 1295 1296 /* 4. succeed, mark a snapshot is created */ 1297 state->bs = bs; 1298 } 1299 1300 static void internal_snapshot_abort(BlkTransactionState *common) 1301 { 1302 InternalSnapshotState *state = 1303 DO_UPCAST(InternalSnapshotState, common, common); 1304 BlockDriverState *bs = state->bs; 1305 QEMUSnapshotInfo *sn = &state->sn; 1306 Error *local_error = NULL; 1307 1308 if (!bs) { 1309 return; 1310 } 1311 1312 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1313 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1314 "device '%s' in abort: %s", 1315 sn->id_str, 1316 sn->name, 1317 bdrv_get_device_name(bs), 1318 error_get_pretty(local_error)); 1319 error_free(local_error); 1320 } 1321 } 1322 1323 static void internal_snapshot_clean(BlkTransactionState *common) 1324 { 1325 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1326 common, common); 1327 1328 if (state->aio_context) { 1329 aio_context_release(state->aio_context); 1330 } 1331 } 1332 1333 /* external snapshot private data */ 1334 typedef struct ExternalSnapshotState { 1335 BlkTransactionState common; 1336 BlockDriverState *old_bs; 1337 BlockDriverState *new_bs; 1338 AioContext *aio_context; 1339 } ExternalSnapshotState; 1340 1341 static void external_snapshot_prepare(BlkTransactionState *common, 1342 Error **errp) 1343 { 1344 BlockDriver *drv; 1345 int flags, ret; 1346 QDict *options = NULL; 1347 Error *local_err = NULL; 1348 bool has_device = false; 1349 const char *device; 1350 bool has_node_name = false; 1351 const char *node_name; 1352 bool has_snapshot_node_name = false; 1353 const char *snapshot_node_name; 1354 const char *new_image_file; 1355 const char *format = "qcow2"; 1356 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1357 ExternalSnapshotState *state = 1358 DO_UPCAST(ExternalSnapshotState, common, common); 1359 TransactionAction *action = common->action; 1360 1361 /* get parameters */ 1362 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1363 1364 has_device = action->blockdev_snapshot_sync->has_device; 1365 device = action->blockdev_snapshot_sync->device; 1366 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1367 node_name = action->blockdev_snapshot_sync->node_name; 1368 has_snapshot_node_name = 1369 action->blockdev_snapshot_sync->has_snapshot_node_name; 1370 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1371 1372 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1373 if (action->blockdev_snapshot_sync->has_format) { 1374 format = action->blockdev_snapshot_sync->format; 1375 } 1376 if (action->blockdev_snapshot_sync->has_mode) { 1377 mode = action->blockdev_snapshot_sync->mode; 1378 } 1379 1380 /* start processing */ 1381 drv = bdrv_find_format(format); 1382 if (!drv) { 1383 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1384 return; 1385 } 1386 1387 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1388 has_node_name ? node_name : NULL, 1389 &local_err); 1390 if (local_err) { 1391 error_propagate(errp, local_err); 1392 return; 1393 } 1394 1395 if (has_node_name && !has_snapshot_node_name) { 1396 error_setg(errp, "New snapshot node name missing"); 1397 return; 1398 } 1399 1400 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1401 error_setg(errp, "New snapshot node name already existing"); 1402 return; 1403 } 1404 1405 /* Acquire AioContext now so any threads operating on old_bs stop */ 1406 state->aio_context = bdrv_get_aio_context(state->old_bs); 1407 aio_context_acquire(state->aio_context); 1408 1409 if (!bdrv_is_inserted(state->old_bs)) { 1410 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1411 return; 1412 } 1413 1414 if (bdrv_op_is_blocked(state->old_bs, 1415 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1416 return; 1417 } 1418 1419 if (!bdrv_is_read_only(state->old_bs)) { 1420 if (bdrv_flush(state->old_bs)) { 1421 error_set(errp, QERR_IO_ERROR); 1422 return; 1423 } 1424 } 1425 1426 if (!bdrv_is_first_non_filter(state->old_bs)) { 1427 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1428 return; 1429 } 1430 1431 flags = state->old_bs->open_flags; 1432 1433 /* create new image w/backing file */ 1434 if (mode != NEW_IMAGE_MODE_EXISTING) { 1435 bdrv_img_create(new_image_file, format, 1436 state->old_bs->filename, 1437 state->old_bs->drv->format_name, 1438 NULL, -1, flags, &local_err, false); 1439 if (local_err) { 1440 error_propagate(errp, local_err); 1441 return; 1442 } 1443 } 1444 1445 if (has_snapshot_node_name) { 1446 options = qdict_new(); 1447 qdict_put(options, "node-name", 1448 qstring_from_str(snapshot_node_name)); 1449 } 1450 1451 /* TODO Inherit bs->options or only take explicit options with an 1452 * extended QMP command? */ 1453 assert(state->new_bs == NULL); 1454 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1455 flags | BDRV_O_NO_BACKING, drv, &local_err); 1456 /* We will manually add the backing_hd field to the bs later */ 1457 if (ret != 0) { 1458 error_propagate(errp, local_err); 1459 } 1460 } 1461 1462 static void external_snapshot_commit(BlkTransactionState *common) 1463 { 1464 ExternalSnapshotState *state = 1465 DO_UPCAST(ExternalSnapshotState, common, common); 1466 1467 bdrv_set_aio_context(state->new_bs, state->aio_context); 1468 1469 /* This removes our old bs and adds the new bs */ 1470 bdrv_append(state->new_bs, state->old_bs); 1471 /* We don't need (or want) to use the transactional 1472 * bdrv_reopen_multiple() across all the entries at once, because we 1473 * don't want to abort all of them if one of them fails the reopen */ 1474 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1475 NULL); 1476 1477 aio_context_release(state->aio_context); 1478 } 1479 1480 static void external_snapshot_abort(BlkTransactionState *common) 1481 { 1482 ExternalSnapshotState *state = 1483 DO_UPCAST(ExternalSnapshotState, common, common); 1484 if (state->new_bs) { 1485 bdrv_unref(state->new_bs); 1486 } 1487 if (state->aio_context) { 1488 aio_context_release(state->aio_context); 1489 } 1490 } 1491 1492 typedef struct DriveBackupState { 1493 BlkTransactionState common; 1494 BlockDriverState *bs; 1495 AioContext *aio_context; 1496 BlockJob *job; 1497 } DriveBackupState; 1498 1499 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1500 { 1501 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1502 BlockDriverState *bs; 1503 BlockBackend *blk; 1504 DriveBackup *backup; 1505 Error *local_err = NULL; 1506 1507 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1508 backup = common->action->drive_backup; 1509 1510 blk = blk_by_name(backup->device); 1511 if (!blk) { 1512 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1513 return; 1514 } 1515 bs = blk_bs(blk); 1516 1517 /* AioContext is released in .clean() */ 1518 state->aio_context = bdrv_get_aio_context(bs); 1519 aio_context_acquire(state->aio_context); 1520 1521 qmp_drive_backup(backup->device, backup->target, 1522 backup->has_format, backup->format, 1523 backup->sync, 1524 backup->has_mode, backup->mode, 1525 backup->has_speed, backup->speed, 1526 backup->has_on_source_error, backup->on_source_error, 1527 backup->has_on_target_error, backup->on_target_error, 1528 &local_err); 1529 if (local_err) { 1530 error_propagate(errp, local_err); 1531 return; 1532 } 1533 1534 state->bs = bs; 1535 state->job = state->bs->job; 1536 } 1537 1538 static void drive_backup_abort(BlkTransactionState *common) 1539 { 1540 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1541 BlockDriverState *bs = state->bs; 1542 1543 /* Only cancel if it's the job we started */ 1544 if (bs && bs->job && bs->job == state->job) { 1545 block_job_cancel_sync(bs->job); 1546 } 1547 } 1548 1549 static void drive_backup_clean(BlkTransactionState *common) 1550 { 1551 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1552 1553 if (state->aio_context) { 1554 aio_context_release(state->aio_context); 1555 } 1556 } 1557 1558 typedef struct BlockdevBackupState { 1559 BlkTransactionState common; 1560 BlockDriverState *bs; 1561 BlockJob *job; 1562 AioContext *aio_context; 1563 } BlockdevBackupState; 1564 1565 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1566 { 1567 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1568 BlockdevBackup *backup; 1569 BlockDriverState *bs, *target; 1570 BlockBackend *blk; 1571 Error *local_err = NULL; 1572 1573 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1574 backup = common->action->blockdev_backup; 1575 1576 blk = blk_by_name(backup->device); 1577 if (!blk) { 1578 error_setg(errp, "Device '%s' not found", backup->device); 1579 return; 1580 } 1581 bs = blk_bs(blk); 1582 1583 blk = blk_by_name(backup->target); 1584 if (!blk) { 1585 error_setg(errp, "Device '%s' not found", backup->target); 1586 return; 1587 } 1588 target = blk_bs(blk); 1589 1590 /* AioContext is released in .clean() */ 1591 state->aio_context = bdrv_get_aio_context(bs); 1592 if (state->aio_context != bdrv_get_aio_context(target)) { 1593 state->aio_context = NULL; 1594 error_setg(errp, "Backup between two IO threads is not implemented"); 1595 return; 1596 } 1597 aio_context_acquire(state->aio_context); 1598 1599 qmp_blockdev_backup(backup->device, backup->target, 1600 backup->sync, 1601 backup->has_speed, backup->speed, 1602 backup->has_on_source_error, backup->on_source_error, 1603 backup->has_on_target_error, backup->on_target_error, 1604 &local_err); 1605 if (local_err) { 1606 error_propagate(errp, local_err); 1607 return; 1608 } 1609 1610 state->bs = bs; 1611 state->job = state->bs->job; 1612 } 1613 1614 static void blockdev_backup_abort(BlkTransactionState *common) 1615 { 1616 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1617 BlockDriverState *bs = state->bs; 1618 1619 /* Only cancel if it's the job we started */ 1620 if (bs && bs->job && bs->job == state->job) { 1621 block_job_cancel_sync(bs->job); 1622 } 1623 } 1624 1625 static void blockdev_backup_clean(BlkTransactionState *common) 1626 { 1627 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1628 1629 if (state->aio_context) { 1630 aio_context_release(state->aio_context); 1631 } 1632 } 1633 1634 static void abort_prepare(BlkTransactionState *common, Error **errp) 1635 { 1636 error_setg(errp, "Transaction aborted using Abort action"); 1637 } 1638 1639 static void abort_commit(BlkTransactionState *common) 1640 { 1641 g_assert_not_reached(); /* this action never succeeds */ 1642 } 1643 1644 static const BdrvActionOps actions[] = { 1645 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1646 .instance_size = sizeof(ExternalSnapshotState), 1647 .prepare = external_snapshot_prepare, 1648 .commit = external_snapshot_commit, 1649 .abort = external_snapshot_abort, 1650 }, 1651 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1652 .instance_size = sizeof(DriveBackupState), 1653 .prepare = drive_backup_prepare, 1654 .abort = drive_backup_abort, 1655 .clean = drive_backup_clean, 1656 }, 1657 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1658 .instance_size = sizeof(BlockdevBackupState), 1659 .prepare = blockdev_backup_prepare, 1660 .abort = blockdev_backup_abort, 1661 .clean = blockdev_backup_clean, 1662 }, 1663 [TRANSACTION_ACTION_KIND_ABORT] = { 1664 .instance_size = sizeof(BlkTransactionState), 1665 .prepare = abort_prepare, 1666 .commit = abort_commit, 1667 }, 1668 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1669 .instance_size = sizeof(InternalSnapshotState), 1670 .prepare = internal_snapshot_prepare, 1671 .abort = internal_snapshot_abort, 1672 .clean = internal_snapshot_clean, 1673 }, 1674 }; 1675 1676 /* 1677 * 'Atomic' group operations. The operations are performed as a set, and if 1678 * any fail then we roll back all operations in the group. 1679 */ 1680 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1681 { 1682 TransactionActionList *dev_entry = dev_list; 1683 BlkTransactionState *state, *next; 1684 Error *local_err = NULL; 1685 1686 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1687 QSIMPLEQ_INIT(&snap_bdrv_states); 1688 1689 /* drain all i/o before any operations */ 1690 bdrv_drain_all(); 1691 1692 /* We don't do anything in this loop that commits us to the operations */ 1693 while (NULL != dev_entry) { 1694 TransactionAction *dev_info = NULL; 1695 const BdrvActionOps *ops; 1696 1697 dev_info = dev_entry->value; 1698 dev_entry = dev_entry->next; 1699 1700 assert(dev_info->kind < ARRAY_SIZE(actions)); 1701 1702 ops = &actions[dev_info->kind]; 1703 assert(ops->instance_size > 0); 1704 1705 state = g_malloc0(ops->instance_size); 1706 state->ops = ops; 1707 state->action = dev_info; 1708 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1709 1710 state->ops->prepare(state, &local_err); 1711 if (local_err) { 1712 error_propagate(errp, local_err); 1713 goto delete_and_fail; 1714 } 1715 } 1716 1717 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1718 if (state->ops->commit) { 1719 state->ops->commit(state); 1720 } 1721 } 1722 1723 /* success */ 1724 goto exit; 1725 1726 delete_and_fail: 1727 /* failure, and it is all-or-none; roll back all operations */ 1728 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1729 if (state->ops->abort) { 1730 state->ops->abort(state); 1731 } 1732 } 1733 exit: 1734 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1735 if (state->ops->clean) { 1736 state->ops->clean(state); 1737 } 1738 g_free(state); 1739 } 1740 } 1741 1742 1743 static void eject_device(BlockBackend *blk, int force, Error **errp) 1744 { 1745 BlockDriverState *bs = blk_bs(blk); 1746 AioContext *aio_context; 1747 1748 aio_context = bdrv_get_aio_context(bs); 1749 aio_context_acquire(aio_context); 1750 1751 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1752 goto out; 1753 } 1754 if (!blk_dev_has_removable_media(blk)) { 1755 error_setg(errp, "Device '%s' is not removable", 1756 bdrv_get_device_name(bs)); 1757 goto out; 1758 } 1759 1760 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1761 blk_dev_eject_request(blk, force); 1762 if (!force) { 1763 error_setg(errp, "Device '%s' is locked", 1764 bdrv_get_device_name(bs)); 1765 goto out; 1766 } 1767 } 1768 1769 bdrv_close(bs); 1770 1771 out: 1772 aio_context_release(aio_context); 1773 } 1774 1775 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1776 { 1777 BlockBackend *blk; 1778 1779 blk = blk_by_name(device); 1780 if (!blk) { 1781 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1782 return; 1783 } 1784 1785 eject_device(blk, force, errp); 1786 } 1787 1788 void qmp_block_passwd(bool has_device, const char *device, 1789 bool has_node_name, const char *node_name, 1790 const char *password, Error **errp) 1791 { 1792 Error *local_err = NULL; 1793 BlockDriverState *bs; 1794 AioContext *aio_context; 1795 1796 bs = bdrv_lookup_bs(has_device ? device : NULL, 1797 has_node_name ? node_name : NULL, 1798 &local_err); 1799 if (local_err) { 1800 error_propagate(errp, local_err); 1801 return; 1802 } 1803 1804 aio_context = bdrv_get_aio_context(bs); 1805 aio_context_acquire(aio_context); 1806 1807 bdrv_add_key(bs, password, errp); 1808 1809 aio_context_release(aio_context); 1810 } 1811 1812 /* Assumes AioContext is held */ 1813 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1814 int bdrv_flags, BlockDriver *drv, 1815 const char *password, Error **errp) 1816 { 1817 Error *local_err = NULL; 1818 int ret; 1819 1820 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1821 if (ret < 0) { 1822 error_propagate(errp, local_err); 1823 return; 1824 } 1825 1826 bdrv_add_key(bs, password, errp); 1827 } 1828 1829 void qmp_change_blockdev(const char *device, const char *filename, 1830 const char *format, Error **errp) 1831 { 1832 BlockBackend *blk; 1833 BlockDriverState *bs; 1834 AioContext *aio_context; 1835 BlockDriver *drv = NULL; 1836 int bdrv_flags; 1837 Error *err = NULL; 1838 1839 blk = blk_by_name(device); 1840 if (!blk) { 1841 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1842 return; 1843 } 1844 bs = blk_bs(blk); 1845 1846 aio_context = bdrv_get_aio_context(bs); 1847 aio_context_acquire(aio_context); 1848 1849 if (format) { 1850 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1851 if (!drv) { 1852 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1853 goto out; 1854 } 1855 } 1856 1857 eject_device(blk, 0, &err); 1858 if (err) { 1859 error_propagate(errp, err); 1860 goto out; 1861 } 1862 1863 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1864 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1865 1866 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1867 1868 out: 1869 aio_context_release(aio_context); 1870 } 1871 1872 /* throttling disk I/O limits */ 1873 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1874 int64_t bps_wr, 1875 int64_t iops, 1876 int64_t iops_rd, 1877 int64_t iops_wr, 1878 bool has_bps_max, 1879 int64_t bps_max, 1880 bool has_bps_rd_max, 1881 int64_t bps_rd_max, 1882 bool has_bps_wr_max, 1883 int64_t bps_wr_max, 1884 bool has_iops_max, 1885 int64_t iops_max, 1886 bool has_iops_rd_max, 1887 int64_t iops_rd_max, 1888 bool has_iops_wr_max, 1889 int64_t iops_wr_max, 1890 bool has_iops_size, 1891 int64_t iops_size, Error **errp) 1892 { 1893 ThrottleConfig cfg; 1894 BlockDriverState *bs; 1895 BlockBackend *blk; 1896 AioContext *aio_context; 1897 1898 blk = blk_by_name(device); 1899 if (!blk) { 1900 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1901 return; 1902 } 1903 bs = blk_bs(blk); 1904 1905 memset(&cfg, 0, sizeof(cfg)); 1906 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1907 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1908 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1909 1910 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1911 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1912 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1913 1914 if (has_bps_max) { 1915 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1916 } 1917 if (has_bps_rd_max) { 1918 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1919 } 1920 if (has_bps_wr_max) { 1921 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1922 } 1923 if (has_iops_max) { 1924 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1925 } 1926 if (has_iops_rd_max) { 1927 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1928 } 1929 if (has_iops_wr_max) { 1930 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1931 } 1932 1933 if (has_iops_size) { 1934 cfg.op_size = iops_size; 1935 } 1936 1937 if (!check_throttle_config(&cfg, errp)) { 1938 return; 1939 } 1940 1941 aio_context = bdrv_get_aio_context(bs); 1942 aio_context_acquire(aio_context); 1943 1944 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1945 bdrv_io_limits_enable(bs); 1946 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1947 bdrv_io_limits_disable(bs); 1948 } 1949 1950 if (bs->io_limits_enabled) { 1951 bdrv_set_io_limits(bs, &cfg); 1952 } 1953 1954 aio_context_release(aio_context); 1955 } 1956 1957 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1958 { 1959 const char *id = qdict_get_str(qdict, "id"); 1960 BlockBackend *blk; 1961 BlockDriverState *bs; 1962 AioContext *aio_context; 1963 Error *local_err = NULL; 1964 1965 blk = blk_by_name(id); 1966 if (!blk) { 1967 error_report("Device '%s' not found", id); 1968 return -1; 1969 } 1970 bs = blk_bs(blk); 1971 1972 if (!blk_legacy_dinfo(blk)) { 1973 error_report("Deleting device added with blockdev-add" 1974 " is not supported"); 1975 return -1; 1976 } 1977 1978 aio_context = bdrv_get_aio_context(bs); 1979 aio_context_acquire(aio_context); 1980 1981 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1982 error_report_err(local_err); 1983 aio_context_release(aio_context); 1984 return -1; 1985 } 1986 1987 /* quiesce block driver; prevent further io */ 1988 bdrv_drain_all(); 1989 bdrv_flush(bs); 1990 bdrv_close(bs); 1991 1992 /* if we have a device attached to this BlockDriverState 1993 * then we need to make the drive anonymous until the device 1994 * can be removed. If this is a drive with no device backing 1995 * then we can just get rid of the block driver state right here. 1996 */ 1997 if (blk_get_attached_dev(blk)) { 1998 blk_hide_on_behalf_of_hmp_drive_del(blk); 1999 /* Further I/O must not pause the guest */ 2000 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2001 BLOCKDEV_ON_ERROR_REPORT); 2002 } else { 2003 blk_unref(blk); 2004 } 2005 2006 aio_context_release(aio_context); 2007 return 0; 2008 } 2009 2010 void qmp_block_resize(bool has_device, const char *device, 2011 bool has_node_name, const char *node_name, 2012 int64_t size, Error **errp) 2013 { 2014 Error *local_err = NULL; 2015 BlockDriverState *bs; 2016 AioContext *aio_context; 2017 int ret; 2018 2019 bs = bdrv_lookup_bs(has_device ? device : NULL, 2020 has_node_name ? node_name : NULL, 2021 &local_err); 2022 if (local_err) { 2023 error_propagate(errp, local_err); 2024 return; 2025 } 2026 2027 aio_context = bdrv_get_aio_context(bs); 2028 aio_context_acquire(aio_context); 2029 2030 if (!bdrv_is_first_non_filter(bs)) { 2031 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2032 goto out; 2033 } 2034 2035 if (size < 0) { 2036 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2037 goto out; 2038 } 2039 2040 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2041 error_set(errp, QERR_DEVICE_IN_USE, device); 2042 goto out; 2043 } 2044 2045 /* complete all in-flight operations before resizing the device */ 2046 bdrv_drain_all(); 2047 2048 ret = bdrv_truncate(bs, size); 2049 switch (ret) { 2050 case 0: 2051 break; 2052 case -ENOMEDIUM: 2053 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2054 break; 2055 case -ENOTSUP: 2056 error_set(errp, QERR_UNSUPPORTED); 2057 break; 2058 case -EACCES: 2059 error_setg(errp, "Device '%s' is read only", device); 2060 break; 2061 case -EBUSY: 2062 error_set(errp, QERR_DEVICE_IN_USE, device); 2063 break; 2064 default: 2065 error_setg_errno(errp, -ret, "Could not resize"); 2066 break; 2067 } 2068 2069 out: 2070 aio_context_release(aio_context); 2071 } 2072 2073 static void block_job_cb(void *opaque, int ret) 2074 { 2075 /* Note that this function may be executed from another AioContext besides 2076 * the QEMU main loop. If you need to access anything that assumes the 2077 * QEMU global mutex, use a BH or introduce a mutex. 2078 */ 2079 2080 BlockDriverState *bs = opaque; 2081 const char *msg = NULL; 2082 2083 trace_block_job_cb(bs, bs->job, ret); 2084 2085 assert(bs->job); 2086 2087 if (ret < 0) { 2088 msg = strerror(-ret); 2089 } 2090 2091 if (block_job_is_cancelled(bs->job)) { 2092 block_job_event_cancelled(bs->job); 2093 } else { 2094 block_job_event_completed(bs->job, msg); 2095 } 2096 2097 bdrv_put_ref_bh_schedule(bs); 2098 } 2099 2100 void qmp_block_stream(const char *device, 2101 bool has_base, const char *base, 2102 bool has_backing_file, const char *backing_file, 2103 bool has_speed, int64_t speed, 2104 bool has_on_error, BlockdevOnError on_error, 2105 Error **errp) 2106 { 2107 BlockBackend *blk; 2108 BlockDriverState *bs; 2109 BlockDriverState *base_bs = NULL; 2110 AioContext *aio_context; 2111 Error *local_err = NULL; 2112 const char *base_name = NULL; 2113 2114 if (!has_on_error) { 2115 on_error = BLOCKDEV_ON_ERROR_REPORT; 2116 } 2117 2118 blk = blk_by_name(device); 2119 if (!blk) { 2120 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2121 return; 2122 } 2123 bs = blk_bs(blk); 2124 2125 aio_context = bdrv_get_aio_context(bs); 2126 aio_context_acquire(aio_context); 2127 2128 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2129 goto out; 2130 } 2131 2132 if (has_base) { 2133 base_bs = bdrv_find_backing_image(bs, base); 2134 if (base_bs == NULL) { 2135 error_set(errp, QERR_BASE_NOT_FOUND, base); 2136 goto out; 2137 } 2138 assert(bdrv_get_aio_context(base_bs) == aio_context); 2139 base_name = base; 2140 } 2141 2142 /* if we are streaming the entire chain, the result will have no backing 2143 * file, and specifying one is therefore an error */ 2144 if (base_bs == NULL && has_backing_file) { 2145 error_setg(errp, "backing file specified, but streaming the " 2146 "entire chain"); 2147 goto out; 2148 } 2149 2150 /* backing_file string overrides base bs filename */ 2151 base_name = has_backing_file ? backing_file : base_name; 2152 2153 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2154 on_error, block_job_cb, bs, &local_err); 2155 if (local_err) { 2156 error_propagate(errp, local_err); 2157 goto out; 2158 } 2159 2160 trace_qmp_block_stream(bs, bs->job); 2161 2162 out: 2163 aio_context_release(aio_context); 2164 } 2165 2166 void qmp_block_commit(const char *device, 2167 bool has_base, const char *base, 2168 bool has_top, const char *top, 2169 bool has_backing_file, const char *backing_file, 2170 bool has_speed, int64_t speed, 2171 Error **errp) 2172 { 2173 BlockBackend *blk; 2174 BlockDriverState *bs; 2175 BlockDriverState *base_bs, *top_bs; 2176 AioContext *aio_context; 2177 Error *local_err = NULL; 2178 /* This will be part of the QMP command, if/when the 2179 * BlockdevOnError change for blkmirror makes it in 2180 */ 2181 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2182 2183 if (!has_speed) { 2184 speed = 0; 2185 } 2186 2187 /* Important Note: 2188 * libvirt relies on the DeviceNotFound error class in order to probe for 2189 * live commit feature versions; for this to work, we must make sure to 2190 * perform the device lookup before any generic errors that may occur in a 2191 * scenario in which all optional arguments are omitted. */ 2192 blk = blk_by_name(device); 2193 if (!blk) { 2194 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2195 return; 2196 } 2197 bs = blk_bs(blk); 2198 2199 aio_context = bdrv_get_aio_context(bs); 2200 aio_context_acquire(aio_context); 2201 2202 /* drain all i/o before commits */ 2203 bdrv_drain_all(); 2204 2205 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2206 goto out; 2207 } 2208 2209 /* default top_bs is the active layer */ 2210 top_bs = bs; 2211 2212 if (has_top && top) { 2213 if (strcmp(bs->filename, top) != 0) { 2214 top_bs = bdrv_find_backing_image(bs, top); 2215 } 2216 } 2217 2218 if (top_bs == NULL) { 2219 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2220 goto out; 2221 } 2222 2223 assert(bdrv_get_aio_context(top_bs) == aio_context); 2224 2225 if (has_base && base) { 2226 base_bs = bdrv_find_backing_image(top_bs, base); 2227 } else { 2228 base_bs = bdrv_find_base(top_bs); 2229 } 2230 2231 if (base_bs == NULL) { 2232 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2233 goto out; 2234 } 2235 2236 assert(bdrv_get_aio_context(base_bs) == aio_context); 2237 2238 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2239 goto out; 2240 } 2241 2242 /* Do not allow attempts to commit an image into itself */ 2243 if (top_bs == base_bs) { 2244 error_setg(errp, "cannot commit an image into itself"); 2245 goto out; 2246 } 2247 2248 if (top_bs == bs) { 2249 if (has_backing_file) { 2250 error_setg(errp, "'backing-file' specified," 2251 " but 'top' is the active layer"); 2252 goto out; 2253 } 2254 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2255 bs, &local_err); 2256 } else { 2257 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2258 has_backing_file ? backing_file : NULL, &local_err); 2259 } 2260 if (local_err != NULL) { 2261 error_propagate(errp, local_err); 2262 goto out; 2263 } 2264 2265 out: 2266 aio_context_release(aio_context); 2267 } 2268 2269 void qmp_drive_backup(const char *device, const char *target, 2270 bool has_format, const char *format, 2271 enum MirrorSyncMode sync, 2272 bool has_mode, enum NewImageMode mode, 2273 bool has_speed, int64_t speed, 2274 bool has_on_source_error, BlockdevOnError on_source_error, 2275 bool has_on_target_error, BlockdevOnError on_target_error, 2276 Error **errp) 2277 { 2278 BlockBackend *blk; 2279 BlockDriverState *bs; 2280 BlockDriverState *target_bs; 2281 BlockDriverState *source = NULL; 2282 AioContext *aio_context; 2283 BlockDriver *drv = NULL; 2284 Error *local_err = NULL; 2285 int flags; 2286 int64_t size; 2287 int ret; 2288 2289 if (!has_speed) { 2290 speed = 0; 2291 } 2292 if (!has_on_source_error) { 2293 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2294 } 2295 if (!has_on_target_error) { 2296 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2297 } 2298 if (!has_mode) { 2299 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2300 } 2301 2302 blk = blk_by_name(device); 2303 if (!blk) { 2304 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2305 return; 2306 } 2307 bs = blk_bs(blk); 2308 2309 aio_context = bdrv_get_aio_context(bs); 2310 aio_context_acquire(aio_context); 2311 2312 /* Although backup_run has this check too, we need to use bs->drv below, so 2313 * do an early check redundantly. */ 2314 if (!bdrv_is_inserted(bs)) { 2315 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2316 goto out; 2317 } 2318 2319 if (!has_format) { 2320 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2321 } 2322 if (format) { 2323 drv = bdrv_find_format(format); 2324 if (!drv) { 2325 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2326 goto out; 2327 } 2328 } 2329 2330 /* Early check to avoid creating target */ 2331 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2332 goto out; 2333 } 2334 2335 flags = bs->open_flags | BDRV_O_RDWR; 2336 2337 /* See if we have a backing HD we can use to create our new image 2338 * on top of. */ 2339 if (sync == MIRROR_SYNC_MODE_TOP) { 2340 source = bs->backing_hd; 2341 if (!source) { 2342 sync = MIRROR_SYNC_MODE_FULL; 2343 } 2344 } 2345 if (sync == MIRROR_SYNC_MODE_NONE) { 2346 source = bs; 2347 } 2348 2349 size = bdrv_getlength(bs); 2350 if (size < 0) { 2351 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2352 goto out; 2353 } 2354 2355 if (mode != NEW_IMAGE_MODE_EXISTING) { 2356 assert(format && drv); 2357 if (source) { 2358 bdrv_img_create(target, format, source->filename, 2359 source->drv->format_name, NULL, 2360 size, flags, &local_err, false); 2361 } else { 2362 bdrv_img_create(target, format, NULL, NULL, NULL, 2363 size, flags, &local_err, false); 2364 } 2365 } 2366 2367 if (local_err) { 2368 error_propagate(errp, local_err); 2369 goto out; 2370 } 2371 2372 target_bs = NULL; 2373 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2374 if (ret < 0) { 2375 error_propagate(errp, local_err); 2376 goto out; 2377 } 2378 2379 bdrv_set_aio_context(target_bs, aio_context); 2380 2381 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2382 block_job_cb, bs, &local_err); 2383 if (local_err != NULL) { 2384 bdrv_unref(target_bs); 2385 error_propagate(errp, local_err); 2386 goto out; 2387 } 2388 2389 out: 2390 aio_context_release(aio_context); 2391 } 2392 2393 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2394 { 2395 return bdrv_named_nodes_list(errp); 2396 } 2397 2398 void qmp_blockdev_backup(const char *device, const char *target, 2399 enum MirrorSyncMode sync, 2400 bool has_speed, int64_t speed, 2401 bool has_on_source_error, 2402 BlockdevOnError on_source_error, 2403 bool has_on_target_error, 2404 BlockdevOnError on_target_error, 2405 Error **errp) 2406 { 2407 BlockBackend *blk; 2408 BlockDriverState *bs; 2409 BlockDriverState *target_bs; 2410 Error *local_err = NULL; 2411 AioContext *aio_context; 2412 2413 if (!has_speed) { 2414 speed = 0; 2415 } 2416 if (!has_on_source_error) { 2417 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2418 } 2419 if (!has_on_target_error) { 2420 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2421 } 2422 2423 blk = blk_by_name(device); 2424 if (!blk) { 2425 error_setg(errp, "Device '%s' not found", device); 2426 return; 2427 } 2428 bs = blk_bs(blk); 2429 2430 aio_context = bdrv_get_aio_context(bs); 2431 aio_context_acquire(aio_context); 2432 2433 blk = blk_by_name(target); 2434 if (!blk) { 2435 error_setg(errp, "Device '%s' not found", target); 2436 goto out; 2437 } 2438 target_bs = blk_bs(blk); 2439 2440 bdrv_ref(target_bs); 2441 bdrv_set_aio_context(target_bs, aio_context); 2442 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2443 block_job_cb, bs, &local_err); 2444 if (local_err != NULL) { 2445 bdrv_unref(target_bs); 2446 error_propagate(errp, local_err); 2447 } 2448 out: 2449 aio_context_release(aio_context); 2450 } 2451 2452 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2453 2454 void qmp_drive_mirror(const char *device, const char *target, 2455 bool has_format, const char *format, 2456 bool has_node_name, const char *node_name, 2457 bool has_replaces, const char *replaces, 2458 enum MirrorSyncMode sync, 2459 bool has_mode, enum NewImageMode mode, 2460 bool has_speed, int64_t speed, 2461 bool has_granularity, uint32_t granularity, 2462 bool has_buf_size, int64_t buf_size, 2463 bool has_on_source_error, BlockdevOnError on_source_error, 2464 bool has_on_target_error, BlockdevOnError on_target_error, 2465 Error **errp) 2466 { 2467 BlockBackend *blk; 2468 BlockDriverState *bs; 2469 BlockDriverState *source, *target_bs; 2470 AioContext *aio_context; 2471 BlockDriver *drv = NULL; 2472 Error *local_err = NULL; 2473 QDict *options = NULL; 2474 int flags; 2475 int64_t size; 2476 int ret; 2477 2478 if (!has_speed) { 2479 speed = 0; 2480 } 2481 if (!has_on_source_error) { 2482 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2483 } 2484 if (!has_on_target_error) { 2485 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2486 } 2487 if (!has_mode) { 2488 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2489 } 2490 if (!has_granularity) { 2491 granularity = 0; 2492 } 2493 if (!has_buf_size) { 2494 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2495 } 2496 2497 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2498 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2499 "a value in range [512B, 64MB]"); 2500 return; 2501 } 2502 if (granularity & (granularity - 1)) { 2503 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2504 return; 2505 } 2506 2507 blk = blk_by_name(device); 2508 if (!blk) { 2509 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2510 return; 2511 } 2512 bs = blk_bs(blk); 2513 2514 aio_context = bdrv_get_aio_context(bs); 2515 aio_context_acquire(aio_context); 2516 2517 if (!bdrv_is_inserted(bs)) { 2518 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2519 goto out; 2520 } 2521 2522 if (!has_format) { 2523 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2524 } 2525 if (format) { 2526 drv = bdrv_find_format(format); 2527 if (!drv) { 2528 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2529 goto out; 2530 } 2531 } 2532 2533 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2534 goto out; 2535 } 2536 2537 flags = bs->open_flags | BDRV_O_RDWR; 2538 source = bs->backing_hd; 2539 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2540 sync = MIRROR_SYNC_MODE_FULL; 2541 } 2542 if (sync == MIRROR_SYNC_MODE_NONE) { 2543 source = bs; 2544 } 2545 2546 size = bdrv_getlength(bs); 2547 if (size < 0) { 2548 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2549 goto out; 2550 } 2551 2552 if (has_replaces) { 2553 BlockDriverState *to_replace_bs; 2554 AioContext *replace_aio_context; 2555 int64_t replace_size; 2556 2557 if (!has_node_name) { 2558 error_setg(errp, "a node-name must be provided when replacing a" 2559 " named node of the graph"); 2560 goto out; 2561 } 2562 2563 to_replace_bs = check_to_replace_node(replaces, &local_err); 2564 2565 if (!to_replace_bs) { 2566 error_propagate(errp, local_err); 2567 goto out; 2568 } 2569 2570 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2571 aio_context_acquire(replace_aio_context); 2572 replace_size = bdrv_getlength(to_replace_bs); 2573 aio_context_release(replace_aio_context); 2574 2575 if (size != replace_size) { 2576 error_setg(errp, "cannot replace image with a mirror image of " 2577 "different size"); 2578 goto out; 2579 } 2580 } 2581 2582 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2583 && mode != NEW_IMAGE_MODE_EXISTING) 2584 { 2585 /* create new image w/o backing file */ 2586 assert(format && drv); 2587 bdrv_img_create(target, format, 2588 NULL, NULL, NULL, size, flags, &local_err, false); 2589 } else { 2590 switch (mode) { 2591 case NEW_IMAGE_MODE_EXISTING: 2592 break; 2593 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2594 /* create new image with backing file */ 2595 bdrv_img_create(target, format, 2596 source->filename, 2597 source->drv->format_name, 2598 NULL, size, flags, &local_err, false); 2599 break; 2600 default: 2601 abort(); 2602 } 2603 } 2604 2605 if (local_err) { 2606 error_propagate(errp, local_err); 2607 goto out; 2608 } 2609 2610 if (has_node_name) { 2611 options = qdict_new(); 2612 qdict_put(options, "node-name", qstring_from_str(node_name)); 2613 } 2614 2615 /* Mirroring takes care of copy-on-write using the source's backing 2616 * file. 2617 */ 2618 target_bs = NULL; 2619 ret = bdrv_open(&target_bs, target, NULL, options, 2620 flags | BDRV_O_NO_BACKING, drv, &local_err); 2621 if (ret < 0) { 2622 error_propagate(errp, local_err); 2623 goto out; 2624 } 2625 2626 bdrv_set_aio_context(target_bs, aio_context); 2627 2628 /* pass the node name to replace to mirror start since it's loose coupling 2629 * and will allow to check whether the node still exist at mirror completion 2630 */ 2631 mirror_start(bs, target_bs, 2632 has_replaces ? replaces : NULL, 2633 speed, granularity, buf_size, sync, 2634 on_source_error, on_target_error, 2635 block_job_cb, bs, &local_err); 2636 if (local_err != NULL) { 2637 bdrv_unref(target_bs); 2638 error_propagate(errp, local_err); 2639 goto out; 2640 } 2641 2642 out: 2643 aio_context_release(aio_context); 2644 } 2645 2646 /* Get the block job for a given device name and acquire its AioContext */ 2647 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2648 Error **errp) 2649 { 2650 BlockBackend *blk; 2651 BlockDriverState *bs; 2652 2653 blk = blk_by_name(device); 2654 if (!blk) { 2655 goto notfound; 2656 } 2657 bs = blk_bs(blk); 2658 2659 *aio_context = bdrv_get_aio_context(bs); 2660 aio_context_acquire(*aio_context); 2661 2662 if (!bs->job) { 2663 aio_context_release(*aio_context); 2664 goto notfound; 2665 } 2666 2667 return bs->job; 2668 2669 notfound: 2670 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2671 "No active block job on device '%s'", device); 2672 *aio_context = NULL; 2673 return NULL; 2674 } 2675 2676 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2677 { 2678 AioContext *aio_context; 2679 BlockJob *job = find_block_job(device, &aio_context, errp); 2680 2681 if (!job) { 2682 return; 2683 } 2684 2685 block_job_set_speed(job, speed, errp); 2686 aio_context_release(aio_context); 2687 } 2688 2689 void qmp_block_job_cancel(const char *device, 2690 bool has_force, bool force, 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 if (!has_force) { 2700 force = false; 2701 } 2702 2703 if (job->user_paused && !force) { 2704 error_setg(errp, "The block job for device '%s' is currently paused", 2705 device); 2706 goto out; 2707 } 2708 2709 trace_qmp_block_job_cancel(job); 2710 block_job_cancel(job); 2711 out: 2712 aio_context_release(aio_context); 2713 } 2714 2715 void qmp_block_job_pause(const char *device, Error **errp) 2716 { 2717 AioContext *aio_context; 2718 BlockJob *job = find_block_job(device, &aio_context, errp); 2719 2720 if (!job || job->user_paused) { 2721 return; 2722 } 2723 2724 job->user_paused = true; 2725 trace_qmp_block_job_pause(job); 2726 block_job_pause(job); 2727 aio_context_release(aio_context); 2728 } 2729 2730 void qmp_block_job_resume(const char *device, Error **errp) 2731 { 2732 AioContext *aio_context; 2733 BlockJob *job = find_block_job(device, &aio_context, errp); 2734 2735 if (!job || !job->user_paused) { 2736 return; 2737 } 2738 2739 job->user_paused = false; 2740 trace_qmp_block_job_resume(job); 2741 block_job_resume(job); 2742 aio_context_release(aio_context); 2743 } 2744 2745 void qmp_block_job_complete(const char *device, Error **errp) 2746 { 2747 AioContext *aio_context; 2748 BlockJob *job = find_block_job(device, &aio_context, errp); 2749 2750 if (!job) { 2751 return; 2752 } 2753 2754 trace_qmp_block_job_complete(job); 2755 block_job_complete(job, errp); 2756 aio_context_release(aio_context); 2757 } 2758 2759 void qmp_change_backing_file(const char *device, 2760 const char *image_node_name, 2761 const char *backing_file, 2762 Error **errp) 2763 { 2764 BlockBackend *blk; 2765 BlockDriverState *bs = NULL; 2766 AioContext *aio_context; 2767 BlockDriverState *image_bs = NULL; 2768 Error *local_err = NULL; 2769 bool ro; 2770 int open_flags; 2771 int ret; 2772 2773 blk = blk_by_name(device); 2774 if (!blk) { 2775 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2776 return; 2777 } 2778 bs = blk_bs(blk); 2779 2780 aio_context = bdrv_get_aio_context(bs); 2781 aio_context_acquire(aio_context); 2782 2783 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2784 if (local_err) { 2785 error_propagate(errp, local_err); 2786 goto out; 2787 } 2788 2789 if (!image_bs) { 2790 error_setg(errp, "image file not found"); 2791 goto out; 2792 } 2793 2794 if (bdrv_find_base(image_bs) == image_bs) { 2795 error_setg(errp, "not allowing backing file change on an image " 2796 "without a backing file"); 2797 goto out; 2798 } 2799 2800 /* even though we are not necessarily operating on bs, we need it to 2801 * determine if block ops are currently prohibited on the chain */ 2802 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2803 goto out; 2804 } 2805 2806 /* final sanity check */ 2807 if (!bdrv_chain_contains(bs, image_bs)) { 2808 error_setg(errp, "'%s' and image file are not in the same chain", 2809 device); 2810 goto out; 2811 } 2812 2813 /* if not r/w, reopen to make r/w */ 2814 open_flags = image_bs->open_flags; 2815 ro = bdrv_is_read_only(image_bs); 2816 2817 if (ro) { 2818 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2819 if (local_err) { 2820 error_propagate(errp, local_err); 2821 goto out; 2822 } 2823 } 2824 2825 ret = bdrv_change_backing_file(image_bs, backing_file, 2826 image_bs->drv ? image_bs->drv->format_name : ""); 2827 2828 if (ret < 0) { 2829 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2830 backing_file); 2831 /* don't exit here, so we can try to restore open flags if 2832 * appropriate */ 2833 } 2834 2835 if (ro) { 2836 bdrv_reopen(image_bs, open_flags, &local_err); 2837 if (local_err) { 2838 error_propagate(errp, local_err); /* will preserve prior errp */ 2839 } 2840 } 2841 2842 out: 2843 aio_context_release(aio_context); 2844 } 2845 2846 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2847 { 2848 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2849 BlockBackend *blk; 2850 QObject *obj; 2851 QDict *qdict; 2852 Error *local_err = NULL; 2853 2854 /* Require an ID in the top level */ 2855 if (!options->has_id) { 2856 error_setg(errp, "Block device needs an ID"); 2857 goto fail; 2858 } 2859 2860 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2861 * cache.direct=false instead of silently switching to aio=threads, except 2862 * when called from drive_new(). 2863 * 2864 * For now, simply forbidding the combination for all drivers will do. */ 2865 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2866 bool direct = options->has_cache && 2867 options->cache->has_direct && 2868 options->cache->direct; 2869 if (!direct) { 2870 error_setg(errp, "aio=native requires cache.direct=true"); 2871 goto fail; 2872 } 2873 } 2874 2875 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2876 &options, NULL, &local_err); 2877 if (local_err) { 2878 error_propagate(errp, local_err); 2879 goto fail; 2880 } 2881 2882 obj = qmp_output_get_qobject(ov); 2883 qdict = qobject_to_qdict(obj); 2884 2885 qdict_flatten(qdict); 2886 2887 blk = blockdev_init(NULL, qdict, &local_err); 2888 if (local_err) { 2889 error_propagate(errp, local_err); 2890 goto fail; 2891 } 2892 2893 if (bdrv_key_required(blk_bs(blk))) { 2894 blk_unref(blk); 2895 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2896 goto fail; 2897 } 2898 2899 fail: 2900 qmp_output_visitor_cleanup(ov); 2901 } 2902 2903 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2904 { 2905 BlockJobInfoList *head = NULL, **p_next = &head; 2906 BlockDriverState *bs; 2907 2908 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 2909 AioContext *aio_context = bdrv_get_aio_context(bs); 2910 2911 aio_context_acquire(aio_context); 2912 2913 if (bs->job) { 2914 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2915 elem->value = block_job_query(bs->job); 2916 *p_next = elem; 2917 p_next = &elem->next; 2918 } 2919 2920 aio_context_release(aio_context); 2921 } 2922 2923 return head; 2924 } 2925 2926 QemuOptsList qemu_common_drive_opts = { 2927 .name = "drive", 2928 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2929 .desc = { 2930 { 2931 .name = "snapshot", 2932 .type = QEMU_OPT_BOOL, 2933 .help = "enable/disable snapshot mode", 2934 },{ 2935 .name = "discard", 2936 .type = QEMU_OPT_STRING, 2937 .help = "discard operation (ignore/off, unmap/on)", 2938 },{ 2939 .name = "cache.writeback", 2940 .type = QEMU_OPT_BOOL, 2941 .help = "enables writeback mode for any caches", 2942 },{ 2943 .name = "cache.direct", 2944 .type = QEMU_OPT_BOOL, 2945 .help = "enables use of O_DIRECT (bypass the host page cache)", 2946 },{ 2947 .name = "cache.no-flush", 2948 .type = QEMU_OPT_BOOL, 2949 .help = "ignore any flush requests for the device", 2950 },{ 2951 .name = "aio", 2952 .type = QEMU_OPT_STRING, 2953 .help = "host AIO implementation (threads, native)", 2954 },{ 2955 .name = "format", 2956 .type = QEMU_OPT_STRING, 2957 .help = "disk format (raw, qcow2, ...)", 2958 },{ 2959 .name = "rerror", 2960 .type = QEMU_OPT_STRING, 2961 .help = "read error action", 2962 },{ 2963 .name = "werror", 2964 .type = QEMU_OPT_STRING, 2965 .help = "write error action", 2966 },{ 2967 .name = "read-only", 2968 .type = QEMU_OPT_BOOL, 2969 .help = "open drive file as read-only", 2970 },{ 2971 .name = "throttling.iops-total", 2972 .type = QEMU_OPT_NUMBER, 2973 .help = "limit total I/O operations per second", 2974 },{ 2975 .name = "throttling.iops-read", 2976 .type = QEMU_OPT_NUMBER, 2977 .help = "limit read operations per second", 2978 },{ 2979 .name = "throttling.iops-write", 2980 .type = QEMU_OPT_NUMBER, 2981 .help = "limit write operations per second", 2982 },{ 2983 .name = "throttling.bps-total", 2984 .type = QEMU_OPT_NUMBER, 2985 .help = "limit total bytes per second", 2986 },{ 2987 .name = "throttling.bps-read", 2988 .type = QEMU_OPT_NUMBER, 2989 .help = "limit read bytes per second", 2990 },{ 2991 .name = "throttling.bps-write", 2992 .type = QEMU_OPT_NUMBER, 2993 .help = "limit write bytes per second", 2994 },{ 2995 .name = "throttling.iops-total-max", 2996 .type = QEMU_OPT_NUMBER, 2997 .help = "I/O operations burst", 2998 },{ 2999 .name = "throttling.iops-read-max", 3000 .type = QEMU_OPT_NUMBER, 3001 .help = "I/O operations read burst", 3002 },{ 3003 .name = "throttling.iops-write-max", 3004 .type = QEMU_OPT_NUMBER, 3005 .help = "I/O operations write burst", 3006 },{ 3007 .name = "throttling.bps-total-max", 3008 .type = QEMU_OPT_NUMBER, 3009 .help = "total bytes burst", 3010 },{ 3011 .name = "throttling.bps-read-max", 3012 .type = QEMU_OPT_NUMBER, 3013 .help = "total bytes read burst", 3014 },{ 3015 .name = "throttling.bps-write-max", 3016 .type = QEMU_OPT_NUMBER, 3017 .help = "total bytes write burst", 3018 },{ 3019 .name = "throttling.iops-size", 3020 .type = QEMU_OPT_NUMBER, 3021 .help = "when limiting by iops max size of an I/O in bytes", 3022 },{ 3023 .name = "copy-on-read", 3024 .type = QEMU_OPT_BOOL, 3025 .help = "copy read data from backing file into image file", 3026 },{ 3027 .name = "detect-zeroes", 3028 .type = QEMU_OPT_STRING, 3029 .help = "try to optimize zero writes (off, on, unmap)", 3030 }, 3031 { /* end of list */ } 3032 }, 3033 }; 3034 3035 QemuOptsList qemu_drive_opts = { 3036 .name = "drive", 3037 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3038 .desc = { 3039 /* 3040 * no elements => accept any params 3041 * validation will happen later 3042 */ 3043 { /* end of list */ } 3044 }, 3045 }; 3046