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 "block/throttle-groups.h" 38 #include "monitor/monitor.h" 39 #include "qemu/error-report.h" 40 #include "qemu/option.h" 41 #include "qemu/config-file.h" 42 #include "qapi/qmp/types.h" 43 #include "qapi-visit.h" 44 #include "qapi/qmp/qerror.h" 45 #include "qapi/qmp-output-visitor.h" 46 #include "qapi/util.h" 47 #include "sysemu/sysemu.h" 48 #include "block/block_int.h" 49 #include "qmp-commands.h" 50 #include "trace.h" 51 #include "sysemu/arch_init.h" 52 53 static const char *const if_name[IF_COUNT] = { 54 [IF_NONE] = "none", 55 [IF_IDE] = "ide", 56 [IF_SCSI] = "scsi", 57 [IF_FLOPPY] = "floppy", 58 [IF_PFLASH] = "pflash", 59 [IF_MTD] = "mtd", 60 [IF_SD] = "sd", 61 [IF_VIRTIO] = "virtio", 62 [IF_XEN] = "xen", 63 }; 64 65 static int if_max_devs[IF_COUNT] = { 66 /* 67 * Do not change these numbers! They govern how drive option 68 * index maps to unit and bus. That mapping is ABI. 69 * 70 * All controllers used to imlement if=T drives need to support 71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 72 * Otherwise, some index values map to "impossible" bus, unit 73 * values. 74 * 75 * For instance, if you change [IF_SCSI] to 255, -drive 76 * if=scsi,index=12 no longer means bus=1,unit=5, but 77 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 78 * the drive can't be set up. Regression. 79 */ 80 [IF_IDE] = 2, 81 [IF_SCSI] = 7, 82 }; 83 84 /** 85 * Boards may call this to offer board-by-board overrides 86 * of the default, global values. 87 */ 88 void override_max_devs(BlockInterfaceType type, int max_devs) 89 { 90 BlockBackend *blk; 91 DriveInfo *dinfo; 92 93 if (max_devs <= 0) { 94 return; 95 } 96 97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 98 dinfo = blk_legacy_dinfo(blk); 99 if (dinfo->type == type) { 100 fprintf(stderr, "Cannot override units-per-bus property of" 101 " the %s interface, because a drive of that type has" 102 " already been added.\n", if_name[type]); 103 g_assert_not_reached(); 104 } 105 } 106 107 if_max_devs[type] = max_devs; 108 } 109 110 /* 111 * We automatically delete the drive when a device using it gets 112 * unplugged. Questionable feature, but we can't just drop it. 113 * Device models call blockdev_mark_auto_del() to schedule the 114 * automatic deletion, and generic qdev code calls blockdev_auto_del() 115 * when deletion is actually safe. 116 */ 117 void blockdev_mark_auto_del(BlockBackend *blk) 118 { 119 DriveInfo *dinfo = blk_legacy_dinfo(blk); 120 BlockDriverState *bs = blk_bs(blk); 121 AioContext *aio_context; 122 123 if (!dinfo) { 124 return; 125 } 126 127 aio_context = bdrv_get_aio_context(bs); 128 aio_context_acquire(aio_context); 129 130 if (bs->job) { 131 block_job_cancel(bs->job); 132 } 133 134 aio_context_release(aio_context); 135 136 dinfo->auto_del = 1; 137 } 138 139 void blockdev_auto_del(BlockBackend *blk) 140 { 141 DriveInfo *dinfo = blk_legacy_dinfo(blk); 142 143 if (dinfo && dinfo->auto_del) { 144 blk_unref(blk); 145 } 146 } 147 148 /** 149 * Returns the current mapping of how many units per bus 150 * a particular interface can support. 151 * 152 * A positive integer indicates n units per bus. 153 * 0 implies the mapping has not been established. 154 * -1 indicates an invalid BlockInterfaceType was given. 155 */ 156 int drive_get_max_devs(BlockInterfaceType type) 157 { 158 if (type >= IF_IDE && type < IF_COUNT) { 159 return if_max_devs[type]; 160 } 161 162 return -1; 163 } 164 165 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 166 { 167 int max_devs = if_max_devs[type]; 168 return max_devs ? index / max_devs : 0; 169 } 170 171 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 172 { 173 int max_devs = if_max_devs[type]; 174 return max_devs ? index % max_devs : index; 175 } 176 177 QemuOpts *drive_def(const char *optstr) 178 { 179 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 180 } 181 182 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 183 const char *optstr) 184 { 185 QemuOpts *opts; 186 187 opts = drive_def(optstr); 188 if (!opts) { 189 return NULL; 190 } 191 if (type != IF_DEFAULT) { 192 qemu_opt_set(opts, "if", if_name[type], &error_abort); 193 } 194 if (index >= 0) { 195 qemu_opt_set_number(opts, "index", index, &error_abort); 196 } 197 if (file) 198 qemu_opt_set(opts, "file", file, &error_abort); 199 return opts; 200 } 201 202 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 203 { 204 BlockBackend *blk; 205 DriveInfo *dinfo; 206 207 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 208 dinfo = blk_legacy_dinfo(blk); 209 if (dinfo && dinfo->type == type 210 && dinfo->bus == bus && dinfo->unit == unit) { 211 return dinfo; 212 } 213 } 214 215 return NULL; 216 } 217 218 bool drive_check_orphaned(void) 219 { 220 BlockBackend *blk; 221 DriveInfo *dinfo; 222 bool rs = false; 223 224 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 225 dinfo = blk_legacy_dinfo(blk); 226 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 227 /* Unless this is a default drive, this may be an oversight. */ 228 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 229 dinfo->type != IF_NONE) { 230 fprintf(stderr, "Warning: Orphaned drive without device: " 231 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 232 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 233 dinfo->bus, dinfo->unit); 234 rs = true; 235 } 236 } 237 238 return rs; 239 } 240 241 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 242 { 243 return drive_get(type, 244 drive_index_to_bus_id(type, index), 245 drive_index_to_unit_id(type, index)); 246 } 247 248 int drive_get_max_bus(BlockInterfaceType type) 249 { 250 int max_bus; 251 BlockBackend *blk; 252 DriveInfo *dinfo; 253 254 max_bus = -1; 255 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 256 dinfo = blk_legacy_dinfo(blk); 257 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 258 max_bus = dinfo->bus; 259 } 260 } 261 return max_bus; 262 } 263 264 /* Get a block device. This should only be used for single-drive devices 265 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 266 appropriate bus. */ 267 DriveInfo *drive_get_next(BlockInterfaceType type) 268 { 269 static int next_block_unit[IF_COUNT]; 270 271 return drive_get(type, 0, next_block_unit[type]++); 272 } 273 274 static void bdrv_format_print(void *opaque, const char *name) 275 { 276 error_printf(" %s", name); 277 } 278 279 typedef struct { 280 QEMUBH *bh; 281 BlockDriverState *bs; 282 } BDRVPutRefBH; 283 284 static void bdrv_put_ref_bh(void *opaque) 285 { 286 BDRVPutRefBH *s = opaque; 287 288 bdrv_unref(s->bs); 289 qemu_bh_delete(s->bh); 290 g_free(s); 291 } 292 293 /* 294 * Release a BDS reference in a BH 295 * 296 * It is not safe to use bdrv_unref() from a callback function when the callers 297 * still need the BlockDriverState. In such cases we schedule a BH to release 298 * the reference. 299 */ 300 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 301 { 302 BDRVPutRefBH *s; 303 304 s = g_new(BDRVPutRefBH, 1); 305 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 306 s->bs = bs; 307 qemu_bh_schedule(s->bh); 308 } 309 310 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 311 { 312 if (!strcmp(buf, "ignore")) { 313 return BLOCKDEV_ON_ERROR_IGNORE; 314 } else if (!is_read && !strcmp(buf, "enospc")) { 315 return BLOCKDEV_ON_ERROR_ENOSPC; 316 } else if (!strcmp(buf, "stop")) { 317 return BLOCKDEV_ON_ERROR_STOP; 318 } else if (!strcmp(buf, "report")) { 319 return BLOCKDEV_ON_ERROR_REPORT; 320 } else { 321 error_setg(errp, "'%s' invalid %s error action", 322 buf, is_read ? "read" : "write"); 323 return -1; 324 } 325 } 326 327 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 328 { 329 if (throttle_conflicting(cfg)) { 330 error_setg(errp, "bps/iops/max total values and read/write values" 331 " cannot be used at the same time"); 332 return false; 333 } 334 335 if (!throttle_is_valid(cfg)) { 336 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 337 return false; 338 } 339 340 if (throttle_max_is_missing_limit(cfg)) { 341 error_setg(errp, "bps_max/iops_max require corresponding" 342 " bps/iops values"); 343 return false; 344 } 345 346 return true; 347 } 348 349 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 350 351 /* Takes the ownership of bs_opts */ 352 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 353 Error **errp) 354 { 355 const char *buf; 356 int ro = 0; 357 int bdrv_flags = 0; 358 int on_read_error, on_write_error; 359 BlockBackend *blk; 360 BlockDriverState *bs; 361 ThrottleConfig cfg; 362 int snapshot = 0; 363 bool copy_on_read; 364 Error *error = NULL; 365 QemuOpts *opts; 366 const char *id; 367 bool has_driver_specific_opts; 368 BlockdevDetectZeroesOptions detect_zeroes; 369 const char *throttling_group; 370 371 /* Check common options by copying from bs_opts to opts, all other options 372 * stay in bs_opts for processing by bdrv_open(). */ 373 id = qdict_get_try_str(bs_opts, "id"); 374 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 375 if (error) { 376 error_propagate(errp, error); 377 goto err_no_opts; 378 } 379 380 qemu_opts_absorb_qdict(opts, bs_opts, &error); 381 if (error) { 382 error_propagate(errp, error); 383 goto early_err; 384 } 385 386 if (id) { 387 qdict_del(bs_opts, "id"); 388 } 389 390 has_driver_specific_opts = !!qdict_size(bs_opts); 391 392 /* extract parameters */ 393 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 394 ro = qemu_opt_get_bool(opts, "read-only", 0); 395 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 396 397 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 398 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 399 error_setg(errp, "invalid discard option"); 400 goto early_err; 401 } 402 } 403 404 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) { 405 bdrv_flags |= BDRV_O_CACHE_WB; 406 } 407 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { 408 bdrv_flags |= BDRV_O_NOCACHE; 409 } 410 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { 411 bdrv_flags |= BDRV_O_NO_FLUSH; 412 } 413 414 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 415 if (!strcmp(buf, "native")) { 416 bdrv_flags |= BDRV_O_NATIVE_AIO; 417 } else if (!strcmp(buf, "threads")) { 418 /* this is the default */ 419 } else { 420 error_setg(errp, "invalid aio option"); 421 goto early_err; 422 } 423 } 424 425 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 426 if (is_help_option(buf)) { 427 error_printf("Supported formats:"); 428 bdrv_iterate_format(bdrv_format_print, NULL); 429 error_printf("\n"); 430 goto early_err; 431 } 432 433 if (qdict_haskey(bs_opts, "driver")) { 434 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 435 goto early_err; 436 } 437 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 438 } 439 440 /* disk I/O throttling */ 441 memset(&cfg, 0, sizeof(cfg)); 442 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 443 qemu_opt_get_number(opts, "throttling.bps-total", 0); 444 cfg.buckets[THROTTLE_BPS_READ].avg = 445 qemu_opt_get_number(opts, "throttling.bps-read", 0); 446 cfg.buckets[THROTTLE_BPS_WRITE].avg = 447 qemu_opt_get_number(opts, "throttling.bps-write", 0); 448 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 449 qemu_opt_get_number(opts, "throttling.iops-total", 0); 450 cfg.buckets[THROTTLE_OPS_READ].avg = 451 qemu_opt_get_number(opts, "throttling.iops-read", 0); 452 cfg.buckets[THROTTLE_OPS_WRITE].avg = 453 qemu_opt_get_number(opts, "throttling.iops-write", 0); 454 455 cfg.buckets[THROTTLE_BPS_TOTAL].max = 456 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 457 cfg.buckets[THROTTLE_BPS_READ].max = 458 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 459 cfg.buckets[THROTTLE_BPS_WRITE].max = 460 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 461 cfg.buckets[THROTTLE_OPS_TOTAL].max = 462 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 463 cfg.buckets[THROTTLE_OPS_READ].max = 464 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 465 cfg.buckets[THROTTLE_OPS_WRITE].max = 466 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 467 468 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 469 470 throttling_group = qemu_opt_get(opts, "throttling.group"); 471 472 if (!check_throttle_config(&cfg, &error)) { 473 error_propagate(errp, error); 474 goto early_err; 475 } 476 477 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 478 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 479 on_write_error = parse_block_error_action(buf, 0, &error); 480 if (error) { 481 error_propagate(errp, error); 482 goto early_err; 483 } 484 } 485 486 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 487 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 488 on_read_error = parse_block_error_action(buf, 1, &error); 489 if (error) { 490 error_propagate(errp, error); 491 goto early_err; 492 } 493 } 494 495 detect_zeroes = 496 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 497 qemu_opt_get(opts, "detect-zeroes"), 498 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 499 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 500 &error); 501 if (error) { 502 error_propagate(errp, error); 503 goto early_err; 504 } 505 506 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 507 !(bdrv_flags & BDRV_O_UNMAP)) { 508 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 509 "without setting discard operation to unmap"); 510 goto early_err; 511 } 512 513 /* init */ 514 if ((!file || !*file) && !has_driver_specific_opts) { 515 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 516 if (!blk) { 517 goto early_err; 518 } 519 520 bs = blk_bs(blk); 521 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 522 bs->read_only = ro; 523 524 QDECREF(bs_opts); 525 } else { 526 if (file && !*file) { 527 file = NULL; 528 } 529 530 if (snapshot) { 531 /* always use cache=unsafe with snapshot */ 532 bdrv_flags &= ~BDRV_O_CACHE_MASK; 533 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 534 } 535 536 if (copy_on_read) { 537 bdrv_flags |= BDRV_O_COPY_ON_READ; 538 } 539 540 if (runstate_check(RUN_STATE_INMIGRATE)) { 541 bdrv_flags |= BDRV_O_INCOMING; 542 } 543 544 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 545 546 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 547 errp); 548 if (!blk) { 549 goto err_no_bs_opts; 550 } 551 bs = blk_bs(blk); 552 } 553 554 bs->detect_zeroes = detect_zeroes; 555 556 bdrv_set_on_error(bs, on_read_error, on_write_error); 557 558 /* disk I/O throttling */ 559 if (throttle_enabled(&cfg)) { 560 if (!throttling_group) { 561 throttling_group = blk_name(blk); 562 } 563 bdrv_io_limits_enable(bs, throttling_group); 564 bdrv_set_io_limits(bs, &cfg); 565 } 566 567 if (bdrv_key_required(bs)) { 568 autostart = 0; 569 } 570 571 err_no_bs_opts: 572 qemu_opts_del(opts); 573 return blk; 574 575 early_err: 576 qemu_opts_del(opts); 577 err_no_opts: 578 QDECREF(bs_opts); 579 return NULL; 580 } 581 582 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 583 Error **errp) 584 { 585 const char *value; 586 587 value = qemu_opt_get(opts, from); 588 if (value) { 589 if (qemu_opt_find(opts, to)) { 590 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 591 "same time", to, from); 592 return; 593 } 594 } 595 596 /* rename all items in opts */ 597 while ((value = qemu_opt_get(opts, from))) { 598 qemu_opt_set(opts, to, value, &error_abort); 599 qemu_opt_unset(opts, from); 600 } 601 } 602 603 QemuOptsList qemu_legacy_drive_opts = { 604 .name = "drive", 605 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 606 .desc = { 607 { 608 .name = "bus", 609 .type = QEMU_OPT_NUMBER, 610 .help = "bus number", 611 },{ 612 .name = "unit", 613 .type = QEMU_OPT_NUMBER, 614 .help = "unit number (i.e. lun for scsi)", 615 },{ 616 .name = "index", 617 .type = QEMU_OPT_NUMBER, 618 .help = "index number", 619 },{ 620 .name = "media", 621 .type = QEMU_OPT_STRING, 622 .help = "media type (disk, cdrom)", 623 },{ 624 .name = "if", 625 .type = QEMU_OPT_STRING, 626 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 627 },{ 628 .name = "cyls", 629 .type = QEMU_OPT_NUMBER, 630 .help = "number of cylinders (ide disk geometry)", 631 },{ 632 .name = "heads", 633 .type = QEMU_OPT_NUMBER, 634 .help = "number of heads (ide disk geometry)", 635 },{ 636 .name = "secs", 637 .type = QEMU_OPT_NUMBER, 638 .help = "number of sectors (ide disk geometry)", 639 },{ 640 .name = "trans", 641 .type = QEMU_OPT_STRING, 642 .help = "chs translation (auto, lba, none)", 643 },{ 644 .name = "boot", 645 .type = QEMU_OPT_BOOL, 646 .help = "(deprecated, ignored)", 647 },{ 648 .name = "addr", 649 .type = QEMU_OPT_STRING, 650 .help = "pci address (virtio only)", 651 },{ 652 .name = "serial", 653 .type = QEMU_OPT_STRING, 654 .help = "disk serial number", 655 },{ 656 .name = "file", 657 .type = QEMU_OPT_STRING, 658 .help = "file name", 659 }, 660 661 /* Options that are passed on, but have special semantics with -drive */ 662 { 663 .name = "read-only", 664 .type = QEMU_OPT_BOOL, 665 .help = "open drive file as read-only", 666 },{ 667 .name = "rerror", 668 .type = QEMU_OPT_STRING, 669 .help = "read error action", 670 },{ 671 .name = "werror", 672 .type = QEMU_OPT_STRING, 673 .help = "write error action", 674 },{ 675 .name = "copy-on-read", 676 .type = QEMU_OPT_BOOL, 677 .help = "copy read data from backing file into image file", 678 }, 679 680 { /* end of list */ } 681 }, 682 }; 683 684 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 685 { 686 const char *value; 687 BlockBackend *blk; 688 DriveInfo *dinfo = NULL; 689 QDict *bs_opts; 690 QemuOpts *legacy_opts; 691 DriveMediaType media = MEDIA_DISK; 692 BlockInterfaceType type; 693 int cyls, heads, secs, translation; 694 int max_devs, bus_id, unit_id, index; 695 const char *devaddr; 696 const char *werror, *rerror; 697 bool read_only = false; 698 bool copy_on_read; 699 const char *serial; 700 const char *filename; 701 Error *local_err = NULL; 702 int i; 703 704 /* Change legacy command line options into QMP ones */ 705 static const struct { 706 const char *from; 707 const char *to; 708 } opt_renames[] = { 709 { "iops", "throttling.iops-total" }, 710 { "iops_rd", "throttling.iops-read" }, 711 { "iops_wr", "throttling.iops-write" }, 712 713 { "bps", "throttling.bps-total" }, 714 { "bps_rd", "throttling.bps-read" }, 715 { "bps_wr", "throttling.bps-write" }, 716 717 { "iops_max", "throttling.iops-total-max" }, 718 { "iops_rd_max", "throttling.iops-read-max" }, 719 { "iops_wr_max", "throttling.iops-write-max" }, 720 721 { "bps_max", "throttling.bps-total-max" }, 722 { "bps_rd_max", "throttling.bps-read-max" }, 723 { "bps_wr_max", "throttling.bps-write-max" }, 724 725 { "iops_size", "throttling.iops-size" }, 726 727 { "group", "throttling.group" }, 728 729 { "readonly", "read-only" }, 730 }; 731 732 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 733 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 734 &local_err); 735 if (local_err) { 736 error_report_err(local_err); 737 return NULL; 738 } 739 } 740 741 value = qemu_opt_get(all_opts, "cache"); 742 if (value) { 743 int flags = 0; 744 745 if (bdrv_parse_cache_flags(value, &flags) != 0) { 746 error_report("invalid cache option"); 747 return NULL; 748 } 749 750 /* Specific options take precedence */ 751 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 752 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 753 !!(flags & BDRV_O_CACHE_WB), &error_abort); 754 } 755 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 756 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 757 !!(flags & BDRV_O_NOCACHE), &error_abort); 758 } 759 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 760 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 761 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 762 } 763 qemu_opt_unset(all_opts, "cache"); 764 } 765 766 /* Get a QDict for processing the options */ 767 bs_opts = qdict_new(); 768 qemu_opts_to_qdict(all_opts, bs_opts); 769 770 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 771 &error_abort); 772 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 773 if (local_err) { 774 error_report_err(local_err); 775 goto fail; 776 } 777 778 /* Deprecated option boot=[on|off] */ 779 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 780 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 781 "ignored. Future versions will reject this parameter. Please " 782 "update your scripts.\n"); 783 } 784 785 /* Media type */ 786 value = qemu_opt_get(legacy_opts, "media"); 787 if (value) { 788 if (!strcmp(value, "disk")) { 789 media = MEDIA_DISK; 790 } else if (!strcmp(value, "cdrom")) { 791 media = MEDIA_CDROM; 792 read_only = true; 793 } else { 794 error_report("'%s' invalid media", value); 795 goto fail; 796 } 797 } 798 799 /* copy-on-read is disabled with a warning for read-only devices */ 800 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 801 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 802 803 if (read_only && copy_on_read) { 804 error_report("warning: disabling copy-on-read on read-only drive"); 805 copy_on_read = false; 806 } 807 808 qdict_put(bs_opts, "read-only", 809 qstring_from_str(read_only ? "on" : "off")); 810 qdict_put(bs_opts, "copy-on-read", 811 qstring_from_str(copy_on_read ? "on" :"off")); 812 813 /* Controller type */ 814 value = qemu_opt_get(legacy_opts, "if"); 815 if (value) { 816 for (type = 0; 817 type < IF_COUNT && strcmp(value, if_name[type]); 818 type++) { 819 } 820 if (type == IF_COUNT) { 821 error_report("unsupported bus type '%s'", value); 822 goto fail; 823 } 824 } else { 825 type = block_default_type; 826 } 827 828 /* Geometry */ 829 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 830 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 831 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 832 833 if (cyls || heads || secs) { 834 if (cyls < 1) { 835 error_report("invalid physical cyls number"); 836 goto fail; 837 } 838 if (heads < 1) { 839 error_report("invalid physical heads number"); 840 goto fail; 841 } 842 if (secs < 1) { 843 error_report("invalid physical secs number"); 844 goto fail; 845 } 846 } 847 848 translation = BIOS_ATA_TRANSLATION_AUTO; 849 value = qemu_opt_get(legacy_opts, "trans"); 850 if (value != NULL) { 851 if (!cyls) { 852 error_report("'%s' trans must be used with cyls, heads and secs", 853 value); 854 goto fail; 855 } 856 if (!strcmp(value, "none")) { 857 translation = BIOS_ATA_TRANSLATION_NONE; 858 } else if (!strcmp(value, "lba")) { 859 translation = BIOS_ATA_TRANSLATION_LBA; 860 } else if (!strcmp(value, "large")) { 861 translation = BIOS_ATA_TRANSLATION_LARGE; 862 } else if (!strcmp(value, "rechs")) { 863 translation = BIOS_ATA_TRANSLATION_RECHS; 864 } else if (!strcmp(value, "auto")) { 865 translation = BIOS_ATA_TRANSLATION_AUTO; 866 } else { 867 error_report("'%s' invalid translation type", value); 868 goto fail; 869 } 870 } 871 872 if (media == MEDIA_CDROM) { 873 if (cyls || secs || heads) { 874 error_report("CHS can't be set with media=cdrom"); 875 goto fail; 876 } 877 } 878 879 /* Device address specified by bus/unit or index. 880 * If none was specified, try to find the first free one. */ 881 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 882 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 883 index = qemu_opt_get_number(legacy_opts, "index", -1); 884 885 max_devs = if_max_devs[type]; 886 887 if (index != -1) { 888 if (bus_id != 0 || unit_id != -1) { 889 error_report("index cannot be used with bus and unit"); 890 goto fail; 891 } 892 bus_id = drive_index_to_bus_id(type, index); 893 unit_id = drive_index_to_unit_id(type, index); 894 } 895 896 if (unit_id == -1) { 897 unit_id = 0; 898 while (drive_get(type, bus_id, unit_id) != NULL) { 899 unit_id++; 900 if (max_devs && unit_id >= max_devs) { 901 unit_id -= max_devs; 902 bus_id++; 903 } 904 } 905 } 906 907 if (max_devs && unit_id >= max_devs) { 908 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 909 goto fail; 910 } 911 912 if (drive_get(type, bus_id, unit_id) != NULL) { 913 error_report("drive with bus=%d, unit=%d (index=%d) exists", 914 bus_id, unit_id, index); 915 goto fail; 916 } 917 918 /* Serial number */ 919 serial = qemu_opt_get(legacy_opts, "serial"); 920 921 /* no id supplied -> create one */ 922 if (qemu_opts_id(all_opts) == NULL) { 923 char *new_id; 924 const char *mediastr = ""; 925 if (type == IF_IDE || type == IF_SCSI) { 926 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 927 } 928 if (max_devs) { 929 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 930 mediastr, unit_id); 931 } else { 932 new_id = g_strdup_printf("%s%s%i", if_name[type], 933 mediastr, unit_id); 934 } 935 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 936 g_free(new_id); 937 } 938 939 /* Add virtio block device */ 940 devaddr = qemu_opt_get(legacy_opts, "addr"); 941 if (devaddr && type != IF_VIRTIO) { 942 error_report("addr is not supported by this bus type"); 943 goto fail; 944 } 945 946 if (type == IF_VIRTIO) { 947 QemuOpts *devopts; 948 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 949 &error_abort); 950 if (arch_type == QEMU_ARCH_S390X) { 951 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 952 } else { 953 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 954 } 955 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 956 &error_abort); 957 if (devaddr) { 958 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 959 } 960 } 961 962 filename = qemu_opt_get(legacy_opts, "file"); 963 964 /* Check werror/rerror compatibility with if=... */ 965 werror = qemu_opt_get(legacy_opts, "werror"); 966 if (werror != NULL) { 967 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 968 type != IF_NONE) { 969 error_report("werror is not supported by this bus type"); 970 goto fail; 971 } 972 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 973 } 974 975 rerror = qemu_opt_get(legacy_opts, "rerror"); 976 if (rerror != NULL) { 977 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 978 type != IF_NONE) { 979 error_report("rerror is not supported by this bus type"); 980 goto fail; 981 } 982 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 983 } 984 985 /* Actual block device init: Functionality shared with blockdev-add */ 986 blk = blockdev_init(filename, bs_opts, &local_err); 987 bs_opts = NULL; 988 if (!blk) { 989 if (local_err) { 990 error_report_err(local_err); 991 } 992 goto fail; 993 } else { 994 assert(!local_err); 995 } 996 997 /* Create legacy DriveInfo */ 998 dinfo = g_malloc0(sizeof(*dinfo)); 999 dinfo->opts = all_opts; 1000 1001 dinfo->cyls = cyls; 1002 dinfo->heads = heads; 1003 dinfo->secs = secs; 1004 dinfo->trans = translation; 1005 1006 dinfo->type = type; 1007 dinfo->bus = bus_id; 1008 dinfo->unit = unit_id; 1009 dinfo->devaddr = devaddr; 1010 dinfo->serial = g_strdup(serial); 1011 1012 blk_set_legacy_dinfo(blk, dinfo); 1013 1014 switch(type) { 1015 case IF_IDE: 1016 case IF_SCSI: 1017 case IF_XEN: 1018 case IF_NONE: 1019 dinfo->media_cd = media == MEDIA_CDROM; 1020 break; 1021 default: 1022 break; 1023 } 1024 1025 fail: 1026 qemu_opts_del(legacy_opts); 1027 QDECREF(bs_opts); 1028 return dinfo; 1029 } 1030 1031 void hmp_commit(Monitor *mon, const QDict *qdict) 1032 { 1033 const char *device = qdict_get_str(qdict, "device"); 1034 BlockBackend *blk; 1035 int ret; 1036 1037 if (!strcmp(device, "all")) { 1038 ret = bdrv_commit_all(); 1039 } else { 1040 blk = blk_by_name(device); 1041 if (!blk) { 1042 monitor_printf(mon, "Device '%s' not found\n", device); 1043 return; 1044 } 1045 ret = bdrv_commit(blk_bs(blk)); 1046 } 1047 if (ret < 0) { 1048 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1049 strerror(-ret)); 1050 } 1051 } 1052 1053 static void blockdev_do_action(int kind, void *data, Error **errp) 1054 { 1055 TransactionAction action; 1056 TransactionActionList list; 1057 1058 action.kind = kind; 1059 action.data = data; 1060 list.value = &action; 1061 list.next = NULL; 1062 qmp_transaction(&list, errp); 1063 } 1064 1065 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1066 bool has_node_name, const char *node_name, 1067 const char *snapshot_file, 1068 bool has_snapshot_node_name, 1069 const char *snapshot_node_name, 1070 bool has_format, const char *format, 1071 bool has_mode, NewImageMode mode, Error **errp) 1072 { 1073 BlockdevSnapshot snapshot = { 1074 .has_device = has_device, 1075 .device = (char *) device, 1076 .has_node_name = has_node_name, 1077 .node_name = (char *) node_name, 1078 .snapshot_file = (char *) snapshot_file, 1079 .has_snapshot_node_name = has_snapshot_node_name, 1080 .snapshot_node_name = (char *) snapshot_node_name, 1081 .has_format = has_format, 1082 .format = (char *) format, 1083 .has_mode = has_mode, 1084 .mode = mode, 1085 }; 1086 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1087 &snapshot, errp); 1088 } 1089 1090 void qmp_blockdev_snapshot_internal_sync(const char *device, 1091 const char *name, 1092 Error **errp) 1093 { 1094 BlockdevSnapshotInternal snapshot = { 1095 .device = (char *) device, 1096 .name = (char *) name 1097 }; 1098 1099 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1100 &snapshot, errp); 1101 } 1102 1103 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1104 bool has_id, 1105 const char *id, 1106 bool has_name, 1107 const char *name, 1108 Error **errp) 1109 { 1110 BlockDriverState *bs; 1111 BlockBackend *blk; 1112 AioContext *aio_context; 1113 QEMUSnapshotInfo sn; 1114 Error *local_err = NULL; 1115 SnapshotInfo *info = NULL; 1116 int ret; 1117 1118 blk = blk_by_name(device); 1119 if (!blk) { 1120 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1121 "Device '%s' not found", device); 1122 return NULL; 1123 } 1124 bs = blk_bs(blk); 1125 1126 if (!has_id) { 1127 id = NULL; 1128 } 1129 1130 if (!has_name) { 1131 name = NULL; 1132 } 1133 1134 if (!id && !name) { 1135 error_setg(errp, "Name or id must be provided"); 1136 return NULL; 1137 } 1138 1139 aio_context = bdrv_get_aio_context(bs); 1140 aio_context_acquire(aio_context); 1141 1142 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1143 goto out_aio_context; 1144 } 1145 1146 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1147 if (local_err) { 1148 error_propagate(errp, local_err); 1149 goto out_aio_context; 1150 } 1151 if (!ret) { 1152 error_setg(errp, 1153 "Snapshot with id '%s' and name '%s' does not exist on " 1154 "device '%s'", 1155 STR_OR_NULL(id), STR_OR_NULL(name), device); 1156 goto out_aio_context; 1157 } 1158 1159 bdrv_snapshot_delete(bs, id, name, &local_err); 1160 if (local_err) { 1161 error_propagate(errp, local_err); 1162 goto out_aio_context; 1163 } 1164 1165 aio_context_release(aio_context); 1166 1167 info = g_new0(SnapshotInfo, 1); 1168 info->id = g_strdup(sn.id_str); 1169 info->name = g_strdup(sn.name); 1170 info->date_nsec = sn.date_nsec; 1171 info->date_sec = sn.date_sec; 1172 info->vm_state_size = sn.vm_state_size; 1173 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1174 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1175 1176 return info; 1177 1178 out_aio_context: 1179 aio_context_release(aio_context); 1180 return NULL; 1181 } 1182 1183 /** 1184 * block_dirty_bitmap_lookup: 1185 * Return a dirty bitmap (if present), after validating 1186 * the node reference and bitmap names. 1187 * 1188 * @node: The name of the BDS node to search for bitmaps 1189 * @name: The name of the bitmap to search for 1190 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1191 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1192 * @errp: Output pointer for error information. Can be NULL. 1193 * 1194 * @return: A bitmap object on success, or NULL on failure. 1195 */ 1196 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1197 const char *name, 1198 BlockDriverState **pbs, 1199 AioContext **paio, 1200 Error **errp) 1201 { 1202 BlockDriverState *bs; 1203 BdrvDirtyBitmap *bitmap; 1204 AioContext *aio_context; 1205 1206 if (!node) { 1207 error_setg(errp, "Node cannot be NULL"); 1208 return NULL; 1209 } 1210 if (!name) { 1211 error_setg(errp, "Bitmap name cannot be NULL"); 1212 return NULL; 1213 } 1214 bs = bdrv_lookup_bs(node, node, NULL); 1215 if (!bs) { 1216 error_setg(errp, "Node '%s' not found", node); 1217 return NULL; 1218 } 1219 1220 aio_context = bdrv_get_aio_context(bs); 1221 aio_context_acquire(aio_context); 1222 1223 bitmap = bdrv_find_dirty_bitmap(bs, name); 1224 if (!bitmap) { 1225 error_setg(errp, "Dirty bitmap '%s' not found", name); 1226 goto fail; 1227 } 1228 1229 if (pbs) { 1230 *pbs = bs; 1231 } 1232 if (paio) { 1233 *paio = aio_context; 1234 } else { 1235 aio_context_release(aio_context); 1236 } 1237 1238 return bitmap; 1239 1240 fail: 1241 aio_context_release(aio_context); 1242 return NULL; 1243 } 1244 1245 /* New and old BlockDriverState structs for atomic group operations */ 1246 1247 typedef struct BlkTransactionState BlkTransactionState; 1248 1249 /* Only prepare() may fail. In a single transaction, only one of commit() or 1250 abort() will be called, clean() will always be called if it present. */ 1251 typedef struct BdrvActionOps { 1252 /* Size of state struct, in bytes. */ 1253 size_t instance_size; 1254 /* Prepare the work, must NOT be NULL. */ 1255 void (*prepare)(BlkTransactionState *common, Error **errp); 1256 /* Commit the changes, can be NULL. */ 1257 void (*commit)(BlkTransactionState *common); 1258 /* Abort the changes on fail, can be NULL. */ 1259 void (*abort)(BlkTransactionState *common); 1260 /* Clean up resource in the end, can be NULL. */ 1261 void (*clean)(BlkTransactionState *common); 1262 } BdrvActionOps; 1263 1264 /* 1265 * This structure must be arranged as first member in child type, assuming 1266 * that compiler will also arrange it to the same address with parent instance. 1267 * Later it will be used in free(). 1268 */ 1269 struct BlkTransactionState { 1270 TransactionAction *action; 1271 const BdrvActionOps *ops; 1272 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1273 }; 1274 1275 /* internal snapshot private data */ 1276 typedef struct InternalSnapshotState { 1277 BlkTransactionState common; 1278 BlockDriverState *bs; 1279 AioContext *aio_context; 1280 QEMUSnapshotInfo sn; 1281 } InternalSnapshotState; 1282 1283 static void internal_snapshot_prepare(BlkTransactionState *common, 1284 Error **errp) 1285 { 1286 Error *local_err = NULL; 1287 const char *device; 1288 const char *name; 1289 BlockBackend *blk; 1290 BlockDriverState *bs; 1291 QEMUSnapshotInfo old_sn, *sn; 1292 bool ret; 1293 qemu_timeval tv; 1294 BlockdevSnapshotInternal *internal; 1295 InternalSnapshotState *state; 1296 int ret1; 1297 1298 g_assert(common->action->kind == 1299 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1300 internal = common->action->blockdev_snapshot_internal_sync; 1301 state = DO_UPCAST(InternalSnapshotState, common, common); 1302 1303 /* 1. parse input */ 1304 device = internal->device; 1305 name = internal->name; 1306 1307 /* 2. check for validation */ 1308 blk = blk_by_name(device); 1309 if (!blk) { 1310 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1311 "Device '%s' not found", device); 1312 return; 1313 } 1314 bs = blk_bs(blk); 1315 1316 /* AioContext is released in .clean() */ 1317 state->aio_context = bdrv_get_aio_context(bs); 1318 aio_context_acquire(state->aio_context); 1319 1320 if (!bdrv_is_inserted(bs)) { 1321 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1322 return; 1323 } 1324 1325 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1326 return; 1327 } 1328 1329 if (bdrv_is_read_only(bs)) { 1330 error_setg(errp, "Device '%s' is read only", device); 1331 return; 1332 } 1333 1334 if (!bdrv_can_snapshot(bs)) { 1335 error_setg(errp, "Block format '%s' used by device '%s' " 1336 "does not support internal snapshots", 1337 bs->drv->format_name, device); 1338 return; 1339 } 1340 1341 if (!strlen(name)) { 1342 error_setg(errp, "Name is empty"); 1343 return; 1344 } 1345 1346 /* check whether a snapshot with name exist */ 1347 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1348 &local_err); 1349 if (local_err) { 1350 error_propagate(errp, local_err); 1351 return; 1352 } else if (ret) { 1353 error_setg(errp, 1354 "Snapshot with name '%s' already exists on device '%s'", 1355 name, device); 1356 return; 1357 } 1358 1359 /* 3. take the snapshot */ 1360 sn = &state->sn; 1361 pstrcpy(sn->name, sizeof(sn->name), name); 1362 qemu_gettimeofday(&tv); 1363 sn->date_sec = tv.tv_sec; 1364 sn->date_nsec = tv.tv_usec * 1000; 1365 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1366 1367 ret1 = bdrv_snapshot_create(bs, sn); 1368 if (ret1 < 0) { 1369 error_setg_errno(errp, -ret1, 1370 "Failed to create snapshot '%s' on device '%s'", 1371 name, device); 1372 return; 1373 } 1374 1375 /* 4. succeed, mark a snapshot is created */ 1376 state->bs = bs; 1377 } 1378 1379 static void internal_snapshot_abort(BlkTransactionState *common) 1380 { 1381 InternalSnapshotState *state = 1382 DO_UPCAST(InternalSnapshotState, common, common); 1383 BlockDriverState *bs = state->bs; 1384 QEMUSnapshotInfo *sn = &state->sn; 1385 Error *local_error = NULL; 1386 1387 if (!bs) { 1388 return; 1389 } 1390 1391 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1392 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1393 "device '%s' in abort: %s", 1394 sn->id_str, 1395 sn->name, 1396 bdrv_get_device_name(bs), 1397 error_get_pretty(local_error)); 1398 error_free(local_error); 1399 } 1400 } 1401 1402 static void internal_snapshot_clean(BlkTransactionState *common) 1403 { 1404 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1405 common, common); 1406 1407 if (state->aio_context) { 1408 aio_context_release(state->aio_context); 1409 } 1410 } 1411 1412 /* external snapshot private data */ 1413 typedef struct ExternalSnapshotState { 1414 BlkTransactionState common; 1415 BlockDriverState *old_bs; 1416 BlockDriverState *new_bs; 1417 AioContext *aio_context; 1418 } ExternalSnapshotState; 1419 1420 static void external_snapshot_prepare(BlkTransactionState *common, 1421 Error **errp) 1422 { 1423 int flags, ret; 1424 QDict *options; 1425 Error *local_err = NULL; 1426 bool has_device = false; 1427 const char *device; 1428 bool has_node_name = false; 1429 const char *node_name; 1430 bool has_snapshot_node_name = false; 1431 const char *snapshot_node_name; 1432 const char *new_image_file; 1433 const char *format = "qcow2"; 1434 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1435 ExternalSnapshotState *state = 1436 DO_UPCAST(ExternalSnapshotState, common, common); 1437 TransactionAction *action = common->action; 1438 1439 /* get parameters */ 1440 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1441 1442 has_device = action->blockdev_snapshot_sync->has_device; 1443 device = action->blockdev_snapshot_sync->device; 1444 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1445 node_name = action->blockdev_snapshot_sync->node_name; 1446 has_snapshot_node_name = 1447 action->blockdev_snapshot_sync->has_snapshot_node_name; 1448 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1449 1450 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1451 if (action->blockdev_snapshot_sync->has_format) { 1452 format = action->blockdev_snapshot_sync->format; 1453 } 1454 if (action->blockdev_snapshot_sync->has_mode) { 1455 mode = action->blockdev_snapshot_sync->mode; 1456 } 1457 1458 /* start processing */ 1459 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1460 has_node_name ? node_name : NULL, 1461 &local_err); 1462 if (local_err) { 1463 error_propagate(errp, local_err); 1464 return; 1465 } 1466 1467 if (has_node_name && !has_snapshot_node_name) { 1468 error_setg(errp, "New snapshot node name missing"); 1469 return; 1470 } 1471 1472 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1473 error_setg(errp, "New snapshot node name already existing"); 1474 return; 1475 } 1476 1477 /* Acquire AioContext now so any threads operating on old_bs stop */ 1478 state->aio_context = bdrv_get_aio_context(state->old_bs); 1479 aio_context_acquire(state->aio_context); 1480 1481 if (!bdrv_is_inserted(state->old_bs)) { 1482 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1483 return; 1484 } 1485 1486 if (bdrv_op_is_blocked(state->old_bs, 1487 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1488 return; 1489 } 1490 1491 if (!bdrv_is_read_only(state->old_bs)) { 1492 if (bdrv_flush(state->old_bs)) { 1493 error_setg(errp, QERR_IO_ERROR); 1494 return; 1495 } 1496 } 1497 1498 if (!bdrv_is_first_non_filter(state->old_bs)) { 1499 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1500 return; 1501 } 1502 1503 flags = state->old_bs->open_flags; 1504 1505 /* create new image w/backing file */ 1506 if (mode != NEW_IMAGE_MODE_EXISTING) { 1507 bdrv_img_create(new_image_file, format, 1508 state->old_bs->filename, 1509 state->old_bs->drv->format_name, 1510 NULL, -1, flags, &local_err, false); 1511 if (local_err) { 1512 error_propagate(errp, local_err); 1513 return; 1514 } 1515 } 1516 1517 options = qdict_new(); 1518 if (has_snapshot_node_name) { 1519 qdict_put(options, "node-name", 1520 qstring_from_str(snapshot_node_name)); 1521 } 1522 qdict_put(options, "driver", qstring_from_str(format)); 1523 1524 /* TODO Inherit bs->options or only take explicit options with an 1525 * extended QMP command? */ 1526 assert(state->new_bs == NULL); 1527 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1528 flags | BDRV_O_NO_BACKING, &local_err); 1529 /* We will manually add the backing_hd field to the bs later */ 1530 if (ret != 0) { 1531 error_propagate(errp, local_err); 1532 } 1533 } 1534 1535 static void external_snapshot_commit(BlkTransactionState *common) 1536 { 1537 ExternalSnapshotState *state = 1538 DO_UPCAST(ExternalSnapshotState, common, common); 1539 1540 bdrv_set_aio_context(state->new_bs, state->aio_context); 1541 1542 /* This removes our old bs and adds the new bs */ 1543 bdrv_append(state->new_bs, state->old_bs); 1544 /* We don't need (or want) to use the transactional 1545 * bdrv_reopen_multiple() across all the entries at once, because we 1546 * don't want to abort all of them if one of them fails the reopen */ 1547 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR, 1548 NULL); 1549 1550 aio_context_release(state->aio_context); 1551 } 1552 1553 static void external_snapshot_abort(BlkTransactionState *common) 1554 { 1555 ExternalSnapshotState *state = 1556 DO_UPCAST(ExternalSnapshotState, common, common); 1557 if (state->new_bs) { 1558 bdrv_unref(state->new_bs); 1559 } 1560 if (state->aio_context) { 1561 aio_context_release(state->aio_context); 1562 } 1563 } 1564 1565 typedef struct DriveBackupState { 1566 BlkTransactionState common; 1567 BlockDriverState *bs; 1568 AioContext *aio_context; 1569 BlockJob *job; 1570 } DriveBackupState; 1571 1572 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1573 { 1574 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1575 BlockDriverState *bs; 1576 BlockBackend *blk; 1577 DriveBackup *backup; 1578 Error *local_err = NULL; 1579 1580 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1581 backup = common->action->drive_backup; 1582 1583 blk = blk_by_name(backup->device); 1584 if (!blk) { 1585 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1586 "Device '%s' not found", backup->device); 1587 return; 1588 } 1589 bs = blk_bs(blk); 1590 1591 /* AioContext is released in .clean() */ 1592 state->aio_context = bdrv_get_aio_context(bs); 1593 aio_context_acquire(state->aio_context); 1594 1595 qmp_drive_backup(backup->device, backup->target, 1596 backup->has_format, backup->format, 1597 backup->sync, 1598 backup->has_mode, backup->mode, 1599 backup->has_speed, backup->speed, 1600 backup->has_bitmap, backup->bitmap, 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 drive_backup_abort(BlkTransactionState *common) 1614 { 1615 DriveBackupState *state = DO_UPCAST(DriveBackupState, 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 drive_backup_clean(BlkTransactionState *common) 1625 { 1626 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1627 1628 if (state->aio_context) { 1629 aio_context_release(state->aio_context); 1630 } 1631 } 1632 1633 typedef struct BlockdevBackupState { 1634 BlkTransactionState common; 1635 BlockDriverState *bs; 1636 BlockJob *job; 1637 AioContext *aio_context; 1638 } BlockdevBackupState; 1639 1640 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1641 { 1642 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1643 BlockdevBackup *backup; 1644 BlockDriverState *bs, *target; 1645 BlockBackend *blk; 1646 Error *local_err = NULL; 1647 1648 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1649 backup = common->action->blockdev_backup; 1650 1651 blk = blk_by_name(backup->device); 1652 if (!blk) { 1653 error_setg(errp, "Device '%s' not found", backup->device); 1654 return; 1655 } 1656 bs = blk_bs(blk); 1657 1658 blk = blk_by_name(backup->target); 1659 if (!blk) { 1660 error_setg(errp, "Device '%s' not found", backup->target); 1661 return; 1662 } 1663 target = blk_bs(blk); 1664 1665 /* AioContext is released in .clean() */ 1666 state->aio_context = bdrv_get_aio_context(bs); 1667 if (state->aio_context != bdrv_get_aio_context(target)) { 1668 state->aio_context = NULL; 1669 error_setg(errp, "Backup between two IO threads is not implemented"); 1670 return; 1671 } 1672 aio_context_acquire(state->aio_context); 1673 1674 qmp_blockdev_backup(backup->device, backup->target, 1675 backup->sync, 1676 backup->has_speed, backup->speed, 1677 backup->has_on_source_error, backup->on_source_error, 1678 backup->has_on_target_error, backup->on_target_error, 1679 &local_err); 1680 if (local_err) { 1681 error_propagate(errp, local_err); 1682 return; 1683 } 1684 1685 state->bs = bs; 1686 state->job = state->bs->job; 1687 } 1688 1689 static void blockdev_backup_abort(BlkTransactionState *common) 1690 { 1691 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1692 BlockDriverState *bs = state->bs; 1693 1694 /* Only cancel if it's the job we started */ 1695 if (bs && bs->job && bs->job == state->job) { 1696 block_job_cancel_sync(bs->job); 1697 } 1698 } 1699 1700 static void blockdev_backup_clean(BlkTransactionState *common) 1701 { 1702 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1703 1704 if (state->aio_context) { 1705 aio_context_release(state->aio_context); 1706 } 1707 } 1708 1709 static void abort_prepare(BlkTransactionState *common, Error **errp) 1710 { 1711 error_setg(errp, "Transaction aborted using Abort action"); 1712 } 1713 1714 static void abort_commit(BlkTransactionState *common) 1715 { 1716 g_assert_not_reached(); /* this action never succeeds */ 1717 } 1718 1719 static const BdrvActionOps actions[] = { 1720 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1721 .instance_size = sizeof(ExternalSnapshotState), 1722 .prepare = external_snapshot_prepare, 1723 .commit = external_snapshot_commit, 1724 .abort = external_snapshot_abort, 1725 }, 1726 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1727 .instance_size = sizeof(DriveBackupState), 1728 .prepare = drive_backup_prepare, 1729 .abort = drive_backup_abort, 1730 .clean = drive_backup_clean, 1731 }, 1732 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1733 .instance_size = sizeof(BlockdevBackupState), 1734 .prepare = blockdev_backup_prepare, 1735 .abort = blockdev_backup_abort, 1736 .clean = blockdev_backup_clean, 1737 }, 1738 [TRANSACTION_ACTION_KIND_ABORT] = { 1739 .instance_size = sizeof(BlkTransactionState), 1740 .prepare = abort_prepare, 1741 .commit = abort_commit, 1742 }, 1743 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1744 .instance_size = sizeof(InternalSnapshotState), 1745 .prepare = internal_snapshot_prepare, 1746 .abort = internal_snapshot_abort, 1747 .clean = internal_snapshot_clean, 1748 }, 1749 }; 1750 1751 /* 1752 * 'Atomic' group operations. The operations are performed as a set, and if 1753 * any fail then we roll back all operations in the group. 1754 */ 1755 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1756 { 1757 TransactionActionList *dev_entry = dev_list; 1758 BlkTransactionState *state, *next; 1759 Error *local_err = NULL; 1760 1761 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1762 QSIMPLEQ_INIT(&snap_bdrv_states); 1763 1764 /* drain all i/o before any operations */ 1765 bdrv_drain_all(); 1766 1767 /* We don't do anything in this loop that commits us to the operations */ 1768 while (NULL != dev_entry) { 1769 TransactionAction *dev_info = NULL; 1770 const BdrvActionOps *ops; 1771 1772 dev_info = dev_entry->value; 1773 dev_entry = dev_entry->next; 1774 1775 assert(dev_info->kind < ARRAY_SIZE(actions)); 1776 1777 ops = &actions[dev_info->kind]; 1778 assert(ops->instance_size > 0); 1779 1780 state = g_malloc0(ops->instance_size); 1781 state->ops = ops; 1782 state->action = dev_info; 1783 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1784 1785 state->ops->prepare(state, &local_err); 1786 if (local_err) { 1787 error_propagate(errp, local_err); 1788 goto delete_and_fail; 1789 } 1790 } 1791 1792 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1793 if (state->ops->commit) { 1794 state->ops->commit(state); 1795 } 1796 } 1797 1798 /* success */ 1799 goto exit; 1800 1801 delete_and_fail: 1802 /* failure, and it is all-or-none; roll back all operations */ 1803 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1804 if (state->ops->abort) { 1805 state->ops->abort(state); 1806 } 1807 } 1808 exit: 1809 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1810 if (state->ops->clean) { 1811 state->ops->clean(state); 1812 } 1813 g_free(state); 1814 } 1815 } 1816 1817 1818 static void eject_device(BlockBackend *blk, int force, Error **errp) 1819 { 1820 BlockDriverState *bs = blk_bs(blk); 1821 AioContext *aio_context; 1822 1823 aio_context = bdrv_get_aio_context(bs); 1824 aio_context_acquire(aio_context); 1825 1826 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1827 goto out; 1828 } 1829 if (!blk_dev_has_removable_media(blk)) { 1830 error_setg(errp, "Device '%s' is not removable", 1831 bdrv_get_device_name(bs)); 1832 goto out; 1833 } 1834 1835 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1836 blk_dev_eject_request(blk, force); 1837 if (!force) { 1838 error_setg(errp, "Device '%s' is locked", 1839 bdrv_get_device_name(bs)); 1840 goto out; 1841 } 1842 } 1843 1844 bdrv_close(bs); 1845 1846 out: 1847 aio_context_release(aio_context); 1848 } 1849 1850 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1851 { 1852 BlockBackend *blk; 1853 1854 blk = blk_by_name(device); 1855 if (!blk) { 1856 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1857 "Device '%s' not found", device); 1858 return; 1859 } 1860 1861 eject_device(blk, force, errp); 1862 } 1863 1864 void qmp_block_passwd(bool has_device, const char *device, 1865 bool has_node_name, const char *node_name, 1866 const char *password, Error **errp) 1867 { 1868 Error *local_err = NULL; 1869 BlockDriverState *bs; 1870 AioContext *aio_context; 1871 1872 bs = bdrv_lookup_bs(has_device ? device : NULL, 1873 has_node_name ? node_name : NULL, 1874 &local_err); 1875 if (local_err) { 1876 error_propagate(errp, local_err); 1877 return; 1878 } 1879 1880 aio_context = bdrv_get_aio_context(bs); 1881 aio_context_acquire(aio_context); 1882 1883 bdrv_add_key(bs, password, errp); 1884 1885 aio_context_release(aio_context); 1886 } 1887 1888 /* Assumes AioContext is held */ 1889 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1890 int bdrv_flags, const char *format, 1891 const char *password, Error **errp) 1892 { 1893 Error *local_err = NULL; 1894 QDict *options = NULL; 1895 int ret; 1896 1897 if (format) { 1898 options = qdict_new(); 1899 qdict_put(options, "driver", qstring_from_str(format)); 1900 } 1901 1902 ret = bdrv_open(&bs, filename, NULL, options, bdrv_flags, &local_err); 1903 if (ret < 0) { 1904 error_propagate(errp, local_err); 1905 return; 1906 } 1907 1908 bdrv_add_key(bs, password, errp); 1909 } 1910 1911 void qmp_change_blockdev(const char *device, const char *filename, 1912 const char *format, Error **errp) 1913 { 1914 BlockBackend *blk; 1915 BlockDriverState *bs; 1916 AioContext *aio_context; 1917 int bdrv_flags; 1918 Error *err = NULL; 1919 1920 blk = blk_by_name(device); 1921 if (!blk) { 1922 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1923 "Device '%s' not found", device); 1924 return; 1925 } 1926 bs = blk_bs(blk); 1927 1928 aio_context = bdrv_get_aio_context(bs); 1929 aio_context_acquire(aio_context); 1930 1931 eject_device(blk, 0, &err); 1932 if (err) { 1933 error_propagate(errp, err); 1934 goto out; 1935 } 1936 1937 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1938 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1939 1940 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, format, NULL, errp); 1941 1942 out: 1943 aio_context_release(aio_context); 1944 } 1945 1946 /* throttling disk I/O limits */ 1947 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1948 int64_t bps_wr, 1949 int64_t iops, 1950 int64_t iops_rd, 1951 int64_t iops_wr, 1952 bool has_bps_max, 1953 int64_t bps_max, 1954 bool has_bps_rd_max, 1955 int64_t bps_rd_max, 1956 bool has_bps_wr_max, 1957 int64_t bps_wr_max, 1958 bool has_iops_max, 1959 int64_t iops_max, 1960 bool has_iops_rd_max, 1961 int64_t iops_rd_max, 1962 bool has_iops_wr_max, 1963 int64_t iops_wr_max, 1964 bool has_iops_size, 1965 int64_t iops_size, 1966 bool has_group, 1967 const char *group, Error **errp) 1968 { 1969 ThrottleConfig cfg; 1970 BlockDriverState *bs; 1971 BlockBackend *blk; 1972 AioContext *aio_context; 1973 1974 blk = blk_by_name(device); 1975 if (!blk) { 1976 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1977 "Device '%s' not found", device); 1978 return; 1979 } 1980 bs = blk_bs(blk); 1981 1982 memset(&cfg, 0, sizeof(cfg)); 1983 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1984 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1985 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1986 1987 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1988 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1989 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1990 1991 if (has_bps_max) { 1992 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1993 } 1994 if (has_bps_rd_max) { 1995 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1996 } 1997 if (has_bps_wr_max) { 1998 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1999 } 2000 if (has_iops_max) { 2001 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 2002 } 2003 if (has_iops_rd_max) { 2004 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 2005 } 2006 if (has_iops_wr_max) { 2007 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 2008 } 2009 2010 if (has_iops_size) { 2011 cfg.op_size = iops_size; 2012 } 2013 2014 if (!check_throttle_config(&cfg, errp)) { 2015 return; 2016 } 2017 2018 aio_context = bdrv_get_aio_context(bs); 2019 aio_context_acquire(aio_context); 2020 2021 if (throttle_enabled(&cfg)) { 2022 /* Enable I/O limits if they're not enabled yet, otherwise 2023 * just update the throttling group. */ 2024 if (!bs->io_limits_enabled) { 2025 bdrv_io_limits_enable(bs, has_group ? group : device); 2026 } else if (has_group) { 2027 bdrv_io_limits_update_group(bs, group); 2028 } 2029 /* Set the new throttling configuration */ 2030 bdrv_set_io_limits(bs, &cfg); 2031 } else if (bs->io_limits_enabled) { 2032 /* If all throttling settings are set to 0, disable I/O limits */ 2033 bdrv_io_limits_disable(bs); 2034 } 2035 2036 aio_context_release(aio_context); 2037 } 2038 2039 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2040 bool has_granularity, uint32_t granularity, 2041 Error **errp) 2042 { 2043 AioContext *aio_context; 2044 BlockDriverState *bs; 2045 2046 if (!name || name[0] == '\0') { 2047 error_setg(errp, "Bitmap name cannot be empty"); 2048 return; 2049 } 2050 2051 bs = bdrv_lookup_bs(node, node, errp); 2052 if (!bs) { 2053 return; 2054 } 2055 2056 aio_context = bdrv_get_aio_context(bs); 2057 aio_context_acquire(aio_context); 2058 2059 if (has_granularity) { 2060 if (granularity < 512 || !is_power_of_2(granularity)) { 2061 error_setg(errp, "Granularity must be power of 2 " 2062 "and at least 512"); 2063 goto out; 2064 } 2065 } else { 2066 /* Default to cluster size, if available: */ 2067 granularity = bdrv_get_default_bitmap_granularity(bs); 2068 } 2069 2070 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2071 2072 out: 2073 aio_context_release(aio_context); 2074 } 2075 2076 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2077 Error **errp) 2078 { 2079 AioContext *aio_context; 2080 BlockDriverState *bs; 2081 BdrvDirtyBitmap *bitmap; 2082 2083 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2084 if (!bitmap || !bs) { 2085 return; 2086 } 2087 2088 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2089 error_setg(errp, 2090 "Bitmap '%s' is currently frozen and cannot be removed", 2091 name); 2092 goto out; 2093 } 2094 bdrv_dirty_bitmap_make_anon(bitmap); 2095 bdrv_release_dirty_bitmap(bs, bitmap); 2096 2097 out: 2098 aio_context_release(aio_context); 2099 } 2100 2101 /** 2102 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2103 * immediately after a full backup operation. 2104 */ 2105 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2106 Error **errp) 2107 { 2108 AioContext *aio_context; 2109 BdrvDirtyBitmap *bitmap; 2110 BlockDriverState *bs; 2111 2112 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2113 if (!bitmap || !bs) { 2114 return; 2115 } 2116 2117 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2118 error_setg(errp, 2119 "Bitmap '%s' is currently frozen and cannot be modified", 2120 name); 2121 goto out; 2122 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2123 error_setg(errp, 2124 "Bitmap '%s' is currently disabled and cannot be cleared", 2125 name); 2126 goto out; 2127 } 2128 2129 bdrv_clear_dirty_bitmap(bitmap); 2130 2131 out: 2132 aio_context_release(aio_context); 2133 } 2134 2135 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2136 { 2137 const char *id = qdict_get_str(qdict, "id"); 2138 BlockBackend *blk; 2139 BlockDriverState *bs; 2140 AioContext *aio_context; 2141 Error *local_err = NULL; 2142 2143 blk = blk_by_name(id); 2144 if (!blk) { 2145 error_report("Device '%s' not found", id); 2146 return; 2147 } 2148 bs = blk_bs(blk); 2149 2150 if (!blk_legacy_dinfo(blk)) { 2151 error_report("Deleting device added with blockdev-add" 2152 " is not supported"); 2153 return; 2154 } 2155 2156 aio_context = bdrv_get_aio_context(bs); 2157 aio_context_acquire(aio_context); 2158 2159 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2160 error_report_err(local_err); 2161 aio_context_release(aio_context); 2162 return; 2163 } 2164 2165 bdrv_close(bs); 2166 2167 /* if we have a device attached to this BlockDriverState 2168 * then we need to make the drive anonymous until the device 2169 * can be removed. If this is a drive with no device backing 2170 * then we can just get rid of the block driver state right here. 2171 */ 2172 if (blk_get_attached_dev(blk)) { 2173 blk_hide_on_behalf_of_hmp_drive_del(blk); 2174 /* Further I/O must not pause the guest */ 2175 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2176 BLOCKDEV_ON_ERROR_REPORT); 2177 } else { 2178 blk_unref(blk); 2179 } 2180 2181 aio_context_release(aio_context); 2182 } 2183 2184 void qmp_block_resize(bool has_device, const char *device, 2185 bool has_node_name, const char *node_name, 2186 int64_t size, Error **errp) 2187 { 2188 Error *local_err = NULL; 2189 BlockDriverState *bs; 2190 AioContext *aio_context; 2191 int ret; 2192 2193 bs = bdrv_lookup_bs(has_device ? device : NULL, 2194 has_node_name ? node_name : NULL, 2195 &local_err); 2196 if (local_err) { 2197 error_propagate(errp, local_err); 2198 return; 2199 } 2200 2201 aio_context = bdrv_get_aio_context(bs); 2202 aio_context_acquire(aio_context); 2203 2204 if (!bdrv_is_first_non_filter(bs)) { 2205 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 2206 goto out; 2207 } 2208 2209 if (size < 0) { 2210 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2211 goto out; 2212 } 2213 2214 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2215 error_setg(errp, QERR_DEVICE_IN_USE, device); 2216 goto out; 2217 } 2218 2219 /* complete all in-flight operations before resizing the device */ 2220 bdrv_drain_all(); 2221 2222 ret = bdrv_truncate(bs, size); 2223 switch (ret) { 2224 case 0: 2225 break; 2226 case -ENOMEDIUM: 2227 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2228 break; 2229 case -ENOTSUP: 2230 error_setg(errp, QERR_UNSUPPORTED); 2231 break; 2232 case -EACCES: 2233 error_setg(errp, "Device '%s' is read only", device); 2234 break; 2235 case -EBUSY: 2236 error_setg(errp, QERR_DEVICE_IN_USE, device); 2237 break; 2238 default: 2239 error_setg_errno(errp, -ret, "Could not resize"); 2240 break; 2241 } 2242 2243 out: 2244 aio_context_release(aio_context); 2245 } 2246 2247 static void block_job_cb(void *opaque, int ret) 2248 { 2249 /* Note that this function may be executed from another AioContext besides 2250 * the QEMU main loop. If you need to access anything that assumes the 2251 * QEMU global mutex, use a BH or introduce a mutex. 2252 */ 2253 2254 BlockDriverState *bs = opaque; 2255 const char *msg = NULL; 2256 2257 trace_block_job_cb(bs, bs->job, ret); 2258 2259 assert(bs->job); 2260 2261 if (ret < 0) { 2262 msg = strerror(-ret); 2263 } 2264 2265 if (block_job_is_cancelled(bs->job)) { 2266 block_job_event_cancelled(bs->job); 2267 } else { 2268 block_job_event_completed(bs->job, msg); 2269 } 2270 2271 bdrv_put_ref_bh_schedule(bs); 2272 } 2273 2274 void qmp_block_stream(const char *device, 2275 bool has_base, const char *base, 2276 bool has_backing_file, const char *backing_file, 2277 bool has_speed, int64_t speed, 2278 bool has_on_error, BlockdevOnError on_error, 2279 Error **errp) 2280 { 2281 BlockBackend *blk; 2282 BlockDriverState *bs; 2283 BlockDriverState *base_bs = NULL; 2284 AioContext *aio_context; 2285 Error *local_err = NULL; 2286 const char *base_name = NULL; 2287 2288 if (!has_on_error) { 2289 on_error = BLOCKDEV_ON_ERROR_REPORT; 2290 } 2291 2292 blk = blk_by_name(device); 2293 if (!blk) { 2294 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2295 "Device '%s' not found", device); 2296 return; 2297 } 2298 bs = blk_bs(blk); 2299 2300 aio_context = bdrv_get_aio_context(bs); 2301 aio_context_acquire(aio_context); 2302 2303 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2304 goto out; 2305 } 2306 2307 if (has_base) { 2308 base_bs = bdrv_find_backing_image(bs, base); 2309 if (base_bs == NULL) { 2310 error_setg(errp, QERR_BASE_NOT_FOUND, base); 2311 goto out; 2312 } 2313 assert(bdrv_get_aio_context(base_bs) == aio_context); 2314 base_name = base; 2315 } 2316 2317 /* if we are streaming the entire chain, the result will have no backing 2318 * file, and specifying one is therefore an error */ 2319 if (base_bs == NULL && has_backing_file) { 2320 error_setg(errp, "backing file specified, but streaming the " 2321 "entire chain"); 2322 goto out; 2323 } 2324 2325 /* backing_file string overrides base bs filename */ 2326 base_name = has_backing_file ? backing_file : base_name; 2327 2328 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2329 on_error, block_job_cb, bs, &local_err); 2330 if (local_err) { 2331 error_propagate(errp, local_err); 2332 goto out; 2333 } 2334 2335 trace_qmp_block_stream(bs, bs->job); 2336 2337 out: 2338 aio_context_release(aio_context); 2339 } 2340 2341 void qmp_block_commit(const char *device, 2342 bool has_base, const char *base, 2343 bool has_top, const char *top, 2344 bool has_backing_file, const char *backing_file, 2345 bool has_speed, int64_t speed, 2346 Error **errp) 2347 { 2348 BlockBackend *blk; 2349 BlockDriverState *bs; 2350 BlockDriverState *base_bs, *top_bs; 2351 AioContext *aio_context; 2352 Error *local_err = NULL; 2353 /* This will be part of the QMP command, if/when the 2354 * BlockdevOnError change for blkmirror makes it in 2355 */ 2356 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2357 2358 if (!has_speed) { 2359 speed = 0; 2360 } 2361 2362 /* Important Note: 2363 * libvirt relies on the DeviceNotFound error class in order to probe for 2364 * live commit feature versions; for this to work, we must make sure to 2365 * perform the device lookup before any generic errors that may occur in a 2366 * scenario in which all optional arguments are omitted. */ 2367 blk = blk_by_name(device); 2368 if (!blk) { 2369 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2370 "Device '%s' not found", device); 2371 return; 2372 } 2373 bs = blk_bs(blk); 2374 2375 aio_context = bdrv_get_aio_context(bs); 2376 aio_context_acquire(aio_context); 2377 2378 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2379 goto out; 2380 } 2381 2382 /* default top_bs is the active layer */ 2383 top_bs = bs; 2384 2385 if (has_top && top) { 2386 if (strcmp(bs->filename, top) != 0) { 2387 top_bs = bdrv_find_backing_image(bs, top); 2388 } 2389 } 2390 2391 if (top_bs == NULL) { 2392 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2393 goto out; 2394 } 2395 2396 assert(bdrv_get_aio_context(top_bs) == aio_context); 2397 2398 if (has_base && base) { 2399 base_bs = bdrv_find_backing_image(top_bs, base); 2400 } else { 2401 base_bs = bdrv_find_base(top_bs); 2402 } 2403 2404 if (base_bs == NULL) { 2405 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2406 goto out; 2407 } 2408 2409 assert(bdrv_get_aio_context(base_bs) == aio_context); 2410 2411 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2412 goto out; 2413 } 2414 2415 /* Do not allow attempts to commit an image into itself */ 2416 if (top_bs == base_bs) { 2417 error_setg(errp, "cannot commit an image into itself"); 2418 goto out; 2419 } 2420 2421 if (top_bs == bs) { 2422 if (has_backing_file) { 2423 error_setg(errp, "'backing-file' specified," 2424 " but 'top' is the active layer"); 2425 goto out; 2426 } 2427 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2428 bs, &local_err); 2429 } else { 2430 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2431 has_backing_file ? backing_file : NULL, &local_err); 2432 } 2433 if (local_err != NULL) { 2434 error_propagate(errp, local_err); 2435 goto out; 2436 } 2437 2438 out: 2439 aio_context_release(aio_context); 2440 } 2441 2442 void qmp_drive_backup(const char *device, const char *target, 2443 bool has_format, const char *format, 2444 enum MirrorSyncMode sync, 2445 bool has_mode, enum NewImageMode mode, 2446 bool has_speed, int64_t speed, 2447 bool has_bitmap, const char *bitmap, 2448 bool has_on_source_error, BlockdevOnError on_source_error, 2449 bool has_on_target_error, BlockdevOnError on_target_error, 2450 Error **errp) 2451 { 2452 BlockBackend *blk; 2453 BlockDriverState *bs; 2454 BlockDriverState *target_bs; 2455 BlockDriverState *source = NULL; 2456 BdrvDirtyBitmap *bmap = NULL; 2457 AioContext *aio_context; 2458 QDict *options = NULL; 2459 Error *local_err = NULL; 2460 int flags; 2461 int64_t size; 2462 int ret; 2463 2464 if (!has_speed) { 2465 speed = 0; 2466 } 2467 if (!has_on_source_error) { 2468 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2469 } 2470 if (!has_on_target_error) { 2471 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2472 } 2473 if (!has_mode) { 2474 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2475 } 2476 2477 blk = blk_by_name(device); 2478 if (!blk) { 2479 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2480 "Device '%s' not found", device); 2481 return; 2482 } 2483 bs = blk_bs(blk); 2484 2485 aio_context = bdrv_get_aio_context(bs); 2486 aio_context_acquire(aio_context); 2487 2488 /* Although backup_run has this check too, we need to use bs->drv below, so 2489 * do an early check redundantly. */ 2490 if (!bdrv_is_inserted(bs)) { 2491 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2492 goto out; 2493 } 2494 2495 if (!has_format) { 2496 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2497 } 2498 2499 /* Early check to avoid creating target */ 2500 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2501 goto out; 2502 } 2503 2504 flags = bs->open_flags | BDRV_O_RDWR; 2505 2506 /* See if we have a backing HD we can use to create our new image 2507 * on top of. */ 2508 if (sync == MIRROR_SYNC_MODE_TOP) { 2509 source = backing_bs(bs); 2510 if (!source) { 2511 sync = MIRROR_SYNC_MODE_FULL; 2512 } 2513 } 2514 if (sync == MIRROR_SYNC_MODE_NONE) { 2515 source = bs; 2516 } 2517 2518 size = bdrv_getlength(bs); 2519 if (size < 0) { 2520 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2521 goto out; 2522 } 2523 2524 if (mode != NEW_IMAGE_MODE_EXISTING) { 2525 assert(format); 2526 if (source) { 2527 bdrv_img_create(target, format, source->filename, 2528 source->drv->format_name, NULL, 2529 size, flags, &local_err, false); 2530 } else { 2531 bdrv_img_create(target, format, NULL, NULL, NULL, 2532 size, flags, &local_err, false); 2533 } 2534 } 2535 2536 if (local_err) { 2537 error_propagate(errp, local_err); 2538 goto out; 2539 } 2540 2541 if (format) { 2542 options = qdict_new(); 2543 qdict_put(options, "driver", qstring_from_str(format)); 2544 } 2545 2546 target_bs = NULL; 2547 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err); 2548 if (ret < 0) { 2549 error_propagate(errp, local_err); 2550 goto out; 2551 } 2552 2553 bdrv_set_aio_context(target_bs, aio_context); 2554 2555 if (has_bitmap) { 2556 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 2557 if (!bmap) { 2558 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 2559 goto out; 2560 } 2561 } 2562 2563 backup_start(bs, target_bs, speed, sync, bmap, 2564 on_source_error, on_target_error, 2565 block_job_cb, bs, &local_err); 2566 if (local_err != NULL) { 2567 bdrv_unref(target_bs); 2568 error_propagate(errp, local_err); 2569 goto out; 2570 } 2571 2572 out: 2573 aio_context_release(aio_context); 2574 } 2575 2576 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2577 { 2578 return bdrv_named_nodes_list(errp); 2579 } 2580 2581 void qmp_blockdev_backup(const char *device, const char *target, 2582 enum MirrorSyncMode sync, 2583 bool has_speed, int64_t speed, 2584 bool has_on_source_error, 2585 BlockdevOnError on_source_error, 2586 bool has_on_target_error, 2587 BlockdevOnError on_target_error, 2588 Error **errp) 2589 { 2590 BlockBackend *blk; 2591 BlockDriverState *bs; 2592 BlockDriverState *target_bs; 2593 Error *local_err = NULL; 2594 AioContext *aio_context; 2595 2596 if (!has_speed) { 2597 speed = 0; 2598 } 2599 if (!has_on_source_error) { 2600 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2601 } 2602 if (!has_on_target_error) { 2603 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2604 } 2605 2606 blk = blk_by_name(device); 2607 if (!blk) { 2608 error_setg(errp, "Device '%s' not found", device); 2609 return; 2610 } 2611 bs = blk_bs(blk); 2612 2613 aio_context = bdrv_get_aio_context(bs); 2614 aio_context_acquire(aio_context); 2615 2616 blk = blk_by_name(target); 2617 if (!blk) { 2618 error_setg(errp, "Device '%s' not found", target); 2619 goto out; 2620 } 2621 target_bs = blk_bs(blk); 2622 2623 bdrv_ref(target_bs); 2624 bdrv_set_aio_context(target_bs, aio_context); 2625 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 2626 on_target_error, block_job_cb, bs, &local_err); 2627 if (local_err != NULL) { 2628 bdrv_unref(target_bs); 2629 error_propagate(errp, local_err); 2630 } 2631 out: 2632 aio_context_release(aio_context); 2633 } 2634 2635 void qmp_drive_mirror(const char *device, const char *target, 2636 bool has_format, const char *format, 2637 bool has_node_name, const char *node_name, 2638 bool has_replaces, const char *replaces, 2639 enum MirrorSyncMode sync, 2640 bool has_mode, enum NewImageMode mode, 2641 bool has_speed, int64_t speed, 2642 bool has_granularity, uint32_t granularity, 2643 bool has_buf_size, int64_t buf_size, 2644 bool has_on_source_error, BlockdevOnError on_source_error, 2645 bool has_on_target_error, BlockdevOnError on_target_error, 2646 bool has_unmap, bool unmap, 2647 Error **errp) 2648 { 2649 BlockBackend *blk; 2650 BlockDriverState *bs; 2651 BlockDriverState *source, *target_bs; 2652 AioContext *aio_context; 2653 Error *local_err = NULL; 2654 QDict *options; 2655 int flags; 2656 int64_t size; 2657 int ret; 2658 2659 if (!has_speed) { 2660 speed = 0; 2661 } 2662 if (!has_on_source_error) { 2663 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2664 } 2665 if (!has_on_target_error) { 2666 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2667 } 2668 if (!has_mode) { 2669 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2670 } 2671 if (!has_granularity) { 2672 granularity = 0; 2673 } 2674 if (!has_buf_size) { 2675 buf_size = 0; 2676 } 2677 if (!has_unmap) { 2678 unmap = true; 2679 } 2680 2681 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2682 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2683 "a value in range [512B, 64MB]"); 2684 return; 2685 } 2686 if (granularity & (granularity - 1)) { 2687 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2688 "power of 2"); 2689 return; 2690 } 2691 2692 blk = blk_by_name(device); 2693 if (!blk) { 2694 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2695 "Device '%s' not found", device); 2696 return; 2697 } 2698 bs = blk_bs(blk); 2699 2700 aio_context = bdrv_get_aio_context(bs); 2701 aio_context_acquire(aio_context); 2702 2703 if (!bdrv_is_inserted(bs)) { 2704 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2705 goto out; 2706 } 2707 2708 if (!has_format) { 2709 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2710 } 2711 2712 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2713 goto out; 2714 } 2715 2716 flags = bs->open_flags | BDRV_O_RDWR; 2717 source = backing_bs(bs); 2718 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2719 sync = MIRROR_SYNC_MODE_FULL; 2720 } 2721 if (sync == MIRROR_SYNC_MODE_NONE) { 2722 source = bs; 2723 } 2724 2725 size = bdrv_getlength(bs); 2726 if (size < 0) { 2727 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2728 goto out; 2729 } 2730 2731 if (has_replaces) { 2732 BlockDriverState *to_replace_bs; 2733 AioContext *replace_aio_context; 2734 int64_t replace_size; 2735 2736 if (!has_node_name) { 2737 error_setg(errp, "a node-name must be provided when replacing a" 2738 " named node of the graph"); 2739 goto out; 2740 } 2741 2742 to_replace_bs = check_to_replace_node(bs, replaces, &local_err); 2743 2744 if (!to_replace_bs) { 2745 error_propagate(errp, local_err); 2746 goto out; 2747 } 2748 2749 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2750 aio_context_acquire(replace_aio_context); 2751 replace_size = bdrv_getlength(to_replace_bs); 2752 aio_context_release(replace_aio_context); 2753 2754 if (size != replace_size) { 2755 error_setg(errp, "cannot replace image with a mirror image of " 2756 "different size"); 2757 goto out; 2758 } 2759 } 2760 2761 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2762 && mode != NEW_IMAGE_MODE_EXISTING) 2763 { 2764 /* create new image w/o backing file */ 2765 assert(format); 2766 bdrv_img_create(target, format, 2767 NULL, NULL, NULL, size, flags, &local_err, false); 2768 } else { 2769 switch (mode) { 2770 case NEW_IMAGE_MODE_EXISTING: 2771 break; 2772 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2773 /* create new image with backing file */ 2774 bdrv_img_create(target, format, 2775 source->filename, 2776 source->drv->format_name, 2777 NULL, size, flags, &local_err, false); 2778 break; 2779 default: 2780 abort(); 2781 } 2782 } 2783 2784 if (local_err) { 2785 error_propagate(errp, local_err); 2786 goto out; 2787 } 2788 2789 options = qdict_new(); 2790 if (has_node_name) { 2791 qdict_put(options, "node-name", qstring_from_str(node_name)); 2792 } 2793 if (format) { 2794 qdict_put(options, "driver", qstring_from_str(format)); 2795 } 2796 2797 /* Mirroring takes care of copy-on-write using the source's backing 2798 * file. 2799 */ 2800 target_bs = NULL; 2801 ret = bdrv_open(&target_bs, target, NULL, options, 2802 flags | BDRV_O_NO_BACKING, &local_err); 2803 if (ret < 0) { 2804 error_propagate(errp, local_err); 2805 goto out; 2806 } 2807 2808 bdrv_set_aio_context(target_bs, aio_context); 2809 2810 /* pass the node name to replace to mirror start since it's loose coupling 2811 * and will allow to check whether the node still exist at mirror completion 2812 */ 2813 mirror_start(bs, target_bs, 2814 has_replaces ? replaces : NULL, 2815 speed, granularity, buf_size, sync, 2816 on_source_error, on_target_error, 2817 unmap, 2818 block_job_cb, bs, &local_err); 2819 if (local_err != NULL) { 2820 bdrv_unref(target_bs); 2821 error_propagate(errp, local_err); 2822 goto out; 2823 } 2824 2825 out: 2826 aio_context_release(aio_context); 2827 } 2828 2829 /* Get the block job for a given device name and acquire its AioContext */ 2830 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2831 Error **errp) 2832 { 2833 BlockBackend *blk; 2834 BlockDriverState *bs; 2835 2836 blk = blk_by_name(device); 2837 if (!blk) { 2838 goto notfound; 2839 } 2840 bs = blk_bs(blk); 2841 2842 *aio_context = bdrv_get_aio_context(bs); 2843 aio_context_acquire(*aio_context); 2844 2845 if (!bs->job) { 2846 aio_context_release(*aio_context); 2847 goto notfound; 2848 } 2849 2850 return bs->job; 2851 2852 notfound: 2853 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2854 "No active block job on device '%s'", device); 2855 *aio_context = NULL; 2856 return NULL; 2857 } 2858 2859 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2860 { 2861 AioContext *aio_context; 2862 BlockJob *job = find_block_job(device, &aio_context, errp); 2863 2864 if (!job) { 2865 return; 2866 } 2867 2868 block_job_set_speed(job, speed, errp); 2869 aio_context_release(aio_context); 2870 } 2871 2872 void qmp_block_job_cancel(const char *device, 2873 bool has_force, bool force, Error **errp) 2874 { 2875 AioContext *aio_context; 2876 BlockJob *job = find_block_job(device, &aio_context, errp); 2877 2878 if (!job) { 2879 return; 2880 } 2881 2882 if (!has_force) { 2883 force = false; 2884 } 2885 2886 if (job->user_paused && !force) { 2887 error_setg(errp, "The block job for device '%s' is currently paused", 2888 device); 2889 goto out; 2890 } 2891 2892 trace_qmp_block_job_cancel(job); 2893 block_job_cancel(job); 2894 out: 2895 aio_context_release(aio_context); 2896 } 2897 2898 void qmp_block_job_pause(const char *device, Error **errp) 2899 { 2900 AioContext *aio_context; 2901 BlockJob *job = find_block_job(device, &aio_context, errp); 2902 2903 if (!job || job->user_paused) { 2904 return; 2905 } 2906 2907 job->user_paused = true; 2908 trace_qmp_block_job_pause(job); 2909 block_job_pause(job); 2910 aio_context_release(aio_context); 2911 } 2912 2913 void qmp_block_job_resume(const char *device, Error **errp) 2914 { 2915 AioContext *aio_context; 2916 BlockJob *job = find_block_job(device, &aio_context, errp); 2917 2918 if (!job || !job->user_paused) { 2919 return; 2920 } 2921 2922 job->user_paused = false; 2923 trace_qmp_block_job_resume(job); 2924 block_job_resume(job); 2925 aio_context_release(aio_context); 2926 } 2927 2928 void qmp_block_job_complete(const char *device, Error **errp) 2929 { 2930 AioContext *aio_context; 2931 BlockJob *job = find_block_job(device, &aio_context, errp); 2932 2933 if (!job) { 2934 return; 2935 } 2936 2937 trace_qmp_block_job_complete(job); 2938 block_job_complete(job, errp); 2939 aio_context_release(aio_context); 2940 } 2941 2942 void qmp_change_backing_file(const char *device, 2943 const char *image_node_name, 2944 const char *backing_file, 2945 Error **errp) 2946 { 2947 BlockBackend *blk; 2948 BlockDriverState *bs = NULL; 2949 AioContext *aio_context; 2950 BlockDriverState *image_bs = NULL; 2951 Error *local_err = NULL; 2952 bool ro; 2953 int open_flags; 2954 int ret; 2955 2956 blk = blk_by_name(device); 2957 if (!blk) { 2958 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2959 "Device '%s' not found", device); 2960 return; 2961 } 2962 bs = blk_bs(blk); 2963 2964 aio_context = bdrv_get_aio_context(bs); 2965 aio_context_acquire(aio_context); 2966 2967 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2968 if (local_err) { 2969 error_propagate(errp, local_err); 2970 goto out; 2971 } 2972 2973 if (!image_bs) { 2974 error_setg(errp, "image file not found"); 2975 goto out; 2976 } 2977 2978 if (bdrv_find_base(image_bs) == image_bs) { 2979 error_setg(errp, "not allowing backing file change on an image " 2980 "without a backing file"); 2981 goto out; 2982 } 2983 2984 /* even though we are not necessarily operating on bs, we need it to 2985 * determine if block ops are currently prohibited on the chain */ 2986 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2987 goto out; 2988 } 2989 2990 /* final sanity check */ 2991 if (!bdrv_chain_contains(bs, image_bs)) { 2992 error_setg(errp, "'%s' and image file are not in the same chain", 2993 device); 2994 goto out; 2995 } 2996 2997 /* if not r/w, reopen to make r/w */ 2998 open_flags = image_bs->open_flags; 2999 ro = bdrv_is_read_only(image_bs); 3000 3001 if (ro) { 3002 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3003 if (local_err) { 3004 error_propagate(errp, local_err); 3005 goto out; 3006 } 3007 } 3008 3009 ret = bdrv_change_backing_file(image_bs, backing_file, 3010 image_bs->drv ? image_bs->drv->format_name : ""); 3011 3012 if (ret < 0) { 3013 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3014 backing_file); 3015 /* don't exit here, so we can try to restore open flags if 3016 * appropriate */ 3017 } 3018 3019 if (ro) { 3020 bdrv_reopen(image_bs, open_flags, &local_err); 3021 if (local_err) { 3022 error_propagate(errp, local_err); /* will preserve prior errp */ 3023 } 3024 } 3025 3026 out: 3027 aio_context_release(aio_context); 3028 } 3029 3030 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3031 { 3032 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3033 BlockBackend *blk; 3034 QObject *obj; 3035 QDict *qdict; 3036 Error *local_err = NULL; 3037 3038 /* Require an ID in the top level */ 3039 if (!options->has_id) { 3040 error_setg(errp, "Block device needs an ID"); 3041 goto fail; 3042 } 3043 3044 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3045 * cache.direct=false instead of silently switching to aio=threads, except 3046 * when called from drive_new(). 3047 * 3048 * For now, simply forbidding the combination for all drivers will do. */ 3049 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3050 bool direct = options->has_cache && 3051 options->cache->has_direct && 3052 options->cache->direct; 3053 if (!direct) { 3054 error_setg(errp, "aio=native requires cache.direct=true"); 3055 goto fail; 3056 } 3057 } 3058 3059 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3060 &options, NULL, &local_err); 3061 if (local_err) { 3062 error_propagate(errp, local_err); 3063 goto fail; 3064 } 3065 3066 obj = qmp_output_get_qobject(ov); 3067 qdict = qobject_to_qdict(obj); 3068 3069 qdict_flatten(qdict); 3070 3071 blk = blockdev_init(NULL, qdict, &local_err); 3072 if (local_err) { 3073 error_propagate(errp, local_err); 3074 goto fail; 3075 } 3076 3077 if (bdrv_key_required(blk_bs(blk))) { 3078 blk_unref(blk); 3079 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3080 goto fail; 3081 } 3082 3083 fail: 3084 qmp_output_visitor_cleanup(ov); 3085 } 3086 3087 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3088 { 3089 BlockJobInfoList *head = NULL, **p_next = &head; 3090 BlockDriverState *bs; 3091 3092 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3093 AioContext *aio_context = bdrv_get_aio_context(bs); 3094 3095 aio_context_acquire(aio_context); 3096 3097 if (bs->job) { 3098 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3099 elem->value = block_job_query(bs->job); 3100 *p_next = elem; 3101 p_next = &elem->next; 3102 } 3103 3104 aio_context_release(aio_context); 3105 } 3106 3107 return head; 3108 } 3109 3110 QemuOptsList qemu_common_drive_opts = { 3111 .name = "drive", 3112 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3113 .desc = { 3114 { 3115 .name = "snapshot", 3116 .type = QEMU_OPT_BOOL, 3117 .help = "enable/disable snapshot mode", 3118 },{ 3119 .name = "discard", 3120 .type = QEMU_OPT_STRING, 3121 .help = "discard operation (ignore/off, unmap/on)", 3122 },{ 3123 .name = BDRV_OPT_CACHE_WB, 3124 .type = QEMU_OPT_BOOL, 3125 .help = "enables writeback mode for any caches", 3126 },{ 3127 .name = BDRV_OPT_CACHE_DIRECT, 3128 .type = QEMU_OPT_BOOL, 3129 .help = "enables use of O_DIRECT (bypass the host page cache)", 3130 },{ 3131 .name = BDRV_OPT_CACHE_NO_FLUSH, 3132 .type = QEMU_OPT_BOOL, 3133 .help = "ignore any flush requests for the device", 3134 },{ 3135 .name = "aio", 3136 .type = QEMU_OPT_STRING, 3137 .help = "host AIO implementation (threads, native)", 3138 },{ 3139 .name = "format", 3140 .type = QEMU_OPT_STRING, 3141 .help = "disk format (raw, qcow2, ...)", 3142 },{ 3143 .name = "rerror", 3144 .type = QEMU_OPT_STRING, 3145 .help = "read error action", 3146 },{ 3147 .name = "werror", 3148 .type = QEMU_OPT_STRING, 3149 .help = "write error action", 3150 },{ 3151 .name = "read-only", 3152 .type = QEMU_OPT_BOOL, 3153 .help = "open drive file as read-only", 3154 },{ 3155 .name = "throttling.iops-total", 3156 .type = QEMU_OPT_NUMBER, 3157 .help = "limit total I/O operations per second", 3158 },{ 3159 .name = "throttling.iops-read", 3160 .type = QEMU_OPT_NUMBER, 3161 .help = "limit read operations per second", 3162 },{ 3163 .name = "throttling.iops-write", 3164 .type = QEMU_OPT_NUMBER, 3165 .help = "limit write operations per second", 3166 },{ 3167 .name = "throttling.bps-total", 3168 .type = QEMU_OPT_NUMBER, 3169 .help = "limit total bytes per second", 3170 },{ 3171 .name = "throttling.bps-read", 3172 .type = QEMU_OPT_NUMBER, 3173 .help = "limit read bytes per second", 3174 },{ 3175 .name = "throttling.bps-write", 3176 .type = QEMU_OPT_NUMBER, 3177 .help = "limit write bytes per second", 3178 },{ 3179 .name = "throttling.iops-total-max", 3180 .type = QEMU_OPT_NUMBER, 3181 .help = "I/O operations burst", 3182 },{ 3183 .name = "throttling.iops-read-max", 3184 .type = QEMU_OPT_NUMBER, 3185 .help = "I/O operations read burst", 3186 },{ 3187 .name = "throttling.iops-write-max", 3188 .type = QEMU_OPT_NUMBER, 3189 .help = "I/O operations write burst", 3190 },{ 3191 .name = "throttling.bps-total-max", 3192 .type = QEMU_OPT_NUMBER, 3193 .help = "total bytes burst", 3194 },{ 3195 .name = "throttling.bps-read-max", 3196 .type = QEMU_OPT_NUMBER, 3197 .help = "total bytes read burst", 3198 },{ 3199 .name = "throttling.bps-write-max", 3200 .type = QEMU_OPT_NUMBER, 3201 .help = "total bytes write burst", 3202 },{ 3203 .name = "throttling.iops-size", 3204 .type = QEMU_OPT_NUMBER, 3205 .help = "when limiting by iops max size of an I/O in bytes", 3206 },{ 3207 .name = "throttling.group", 3208 .type = QEMU_OPT_STRING, 3209 .help = "name of the block throttling group", 3210 },{ 3211 .name = "copy-on-read", 3212 .type = QEMU_OPT_BOOL, 3213 .help = "copy read data from backing file into image file", 3214 },{ 3215 .name = "detect-zeroes", 3216 .type = QEMU_OPT_STRING, 3217 .help = "try to optimize zero writes (off, on, unmap)", 3218 }, 3219 { /* end of list */ } 3220 }, 3221 }; 3222 3223 QemuOptsList qemu_drive_opts = { 3224 .name = "drive", 3225 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3226 .desc = { 3227 /* 3228 * no elements => accept any params 3229 * validation will happen later 3230 */ 3231 { /* end of list */ } 3232 }, 3233 }; 3234