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 #ifdef CONFIG_LINUX_AIO 415 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 416 if (!strcmp(buf, "native")) { 417 bdrv_flags |= BDRV_O_NATIVE_AIO; 418 } else if (!strcmp(buf, "threads")) { 419 /* this is the default */ 420 } else { 421 error_setg(errp, "invalid aio option"); 422 goto early_err; 423 } 424 } 425 #endif 426 427 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 428 if (is_help_option(buf)) { 429 error_printf("Supported formats:"); 430 bdrv_iterate_format(bdrv_format_print, NULL); 431 error_printf("\n"); 432 goto early_err; 433 } 434 435 if (qdict_haskey(bs_opts, "driver")) { 436 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 437 goto early_err; 438 } 439 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 440 } 441 442 /* disk I/O throttling */ 443 memset(&cfg, 0, sizeof(cfg)); 444 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 445 qemu_opt_get_number(opts, "throttling.bps-total", 0); 446 cfg.buckets[THROTTLE_BPS_READ].avg = 447 qemu_opt_get_number(opts, "throttling.bps-read", 0); 448 cfg.buckets[THROTTLE_BPS_WRITE].avg = 449 qemu_opt_get_number(opts, "throttling.bps-write", 0); 450 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 451 qemu_opt_get_number(opts, "throttling.iops-total", 0); 452 cfg.buckets[THROTTLE_OPS_READ].avg = 453 qemu_opt_get_number(opts, "throttling.iops-read", 0); 454 cfg.buckets[THROTTLE_OPS_WRITE].avg = 455 qemu_opt_get_number(opts, "throttling.iops-write", 0); 456 457 cfg.buckets[THROTTLE_BPS_TOTAL].max = 458 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 459 cfg.buckets[THROTTLE_BPS_READ].max = 460 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 461 cfg.buckets[THROTTLE_BPS_WRITE].max = 462 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 463 cfg.buckets[THROTTLE_OPS_TOTAL].max = 464 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 465 cfg.buckets[THROTTLE_OPS_READ].max = 466 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 467 cfg.buckets[THROTTLE_OPS_WRITE].max = 468 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 469 470 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 471 472 throttling_group = qemu_opt_get(opts, "throttling.group"); 473 474 if (!check_throttle_config(&cfg, &error)) { 475 error_propagate(errp, error); 476 goto early_err; 477 } 478 479 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 480 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 481 on_write_error = parse_block_error_action(buf, 0, &error); 482 if (error) { 483 error_propagate(errp, error); 484 goto early_err; 485 } 486 } 487 488 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 489 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 490 on_read_error = parse_block_error_action(buf, 1, &error); 491 if (error) { 492 error_propagate(errp, error); 493 goto early_err; 494 } 495 } 496 497 detect_zeroes = 498 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 499 qemu_opt_get(opts, "detect-zeroes"), 500 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 501 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 502 &error); 503 if (error) { 504 error_propagate(errp, error); 505 goto early_err; 506 } 507 508 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 509 !(bdrv_flags & BDRV_O_UNMAP)) { 510 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 511 "without setting discard operation to unmap"); 512 goto early_err; 513 } 514 515 /* init */ 516 if ((!file || !*file) && !has_driver_specific_opts) { 517 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 518 if (!blk) { 519 goto early_err; 520 } 521 522 bs = blk_bs(blk); 523 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 524 bs->read_only = ro; 525 526 QDECREF(bs_opts); 527 } else { 528 if (file && !*file) { 529 file = NULL; 530 } 531 532 if (snapshot) { 533 /* always use cache=unsafe with snapshot */ 534 bdrv_flags &= ~BDRV_O_CACHE_MASK; 535 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 536 } 537 538 if (copy_on_read) { 539 bdrv_flags |= BDRV_O_COPY_ON_READ; 540 } 541 542 if (runstate_check(RUN_STATE_INMIGRATE)) { 543 bdrv_flags |= BDRV_O_INCOMING; 544 } 545 546 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 547 548 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 549 errp); 550 if (!blk) { 551 goto err_no_bs_opts; 552 } 553 bs = blk_bs(blk); 554 } 555 556 bs->detect_zeroes = detect_zeroes; 557 558 bdrv_set_on_error(bs, on_read_error, on_write_error); 559 560 /* disk I/O throttling */ 561 if (throttle_enabled(&cfg)) { 562 if (!throttling_group) { 563 throttling_group = blk_name(blk); 564 } 565 bdrv_io_limits_enable(bs, throttling_group); 566 bdrv_set_io_limits(bs, &cfg); 567 } 568 569 if (bdrv_key_required(bs)) { 570 autostart = 0; 571 } 572 573 err_no_bs_opts: 574 qemu_opts_del(opts); 575 return blk; 576 577 early_err: 578 qemu_opts_del(opts); 579 err_no_opts: 580 QDECREF(bs_opts); 581 return NULL; 582 } 583 584 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 585 Error **errp) 586 { 587 const char *value; 588 589 value = qemu_opt_get(opts, from); 590 if (value) { 591 if (qemu_opt_find(opts, to)) { 592 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 593 "same time", to, from); 594 return; 595 } 596 } 597 598 /* rename all items in opts */ 599 while ((value = qemu_opt_get(opts, from))) { 600 qemu_opt_set(opts, to, value, &error_abort); 601 qemu_opt_unset(opts, from); 602 } 603 } 604 605 QemuOptsList qemu_legacy_drive_opts = { 606 .name = "drive", 607 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 608 .desc = { 609 { 610 .name = "bus", 611 .type = QEMU_OPT_NUMBER, 612 .help = "bus number", 613 },{ 614 .name = "unit", 615 .type = QEMU_OPT_NUMBER, 616 .help = "unit number (i.e. lun for scsi)", 617 },{ 618 .name = "index", 619 .type = QEMU_OPT_NUMBER, 620 .help = "index number", 621 },{ 622 .name = "media", 623 .type = QEMU_OPT_STRING, 624 .help = "media type (disk, cdrom)", 625 },{ 626 .name = "if", 627 .type = QEMU_OPT_STRING, 628 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 629 },{ 630 .name = "cyls", 631 .type = QEMU_OPT_NUMBER, 632 .help = "number of cylinders (ide disk geometry)", 633 },{ 634 .name = "heads", 635 .type = QEMU_OPT_NUMBER, 636 .help = "number of heads (ide disk geometry)", 637 },{ 638 .name = "secs", 639 .type = QEMU_OPT_NUMBER, 640 .help = "number of sectors (ide disk geometry)", 641 },{ 642 .name = "trans", 643 .type = QEMU_OPT_STRING, 644 .help = "chs translation (auto, lba, none)", 645 },{ 646 .name = "boot", 647 .type = QEMU_OPT_BOOL, 648 .help = "(deprecated, ignored)", 649 },{ 650 .name = "addr", 651 .type = QEMU_OPT_STRING, 652 .help = "pci address (virtio only)", 653 },{ 654 .name = "serial", 655 .type = QEMU_OPT_STRING, 656 .help = "disk serial number", 657 },{ 658 .name = "file", 659 .type = QEMU_OPT_STRING, 660 .help = "file name", 661 }, 662 663 /* Options that are passed on, but have special semantics with -drive */ 664 { 665 .name = "read-only", 666 .type = QEMU_OPT_BOOL, 667 .help = "open drive file as read-only", 668 },{ 669 .name = "rerror", 670 .type = QEMU_OPT_STRING, 671 .help = "read error action", 672 },{ 673 .name = "werror", 674 .type = QEMU_OPT_STRING, 675 .help = "write error action", 676 },{ 677 .name = "copy-on-read", 678 .type = QEMU_OPT_BOOL, 679 .help = "copy read data from backing file into image file", 680 }, 681 682 { /* end of list */ } 683 }, 684 }; 685 686 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 687 { 688 const char *value; 689 BlockBackend *blk; 690 DriveInfo *dinfo = NULL; 691 QDict *bs_opts; 692 QemuOpts *legacy_opts; 693 DriveMediaType media = MEDIA_DISK; 694 BlockInterfaceType type; 695 int cyls, heads, secs, translation; 696 int max_devs, bus_id, unit_id, index; 697 const char *devaddr; 698 const char *werror, *rerror; 699 bool read_only = false; 700 bool copy_on_read; 701 const char *serial; 702 const char *filename; 703 Error *local_err = NULL; 704 int i; 705 706 /* Change legacy command line options into QMP ones */ 707 static const struct { 708 const char *from; 709 const char *to; 710 } opt_renames[] = { 711 { "iops", "throttling.iops-total" }, 712 { "iops_rd", "throttling.iops-read" }, 713 { "iops_wr", "throttling.iops-write" }, 714 715 { "bps", "throttling.bps-total" }, 716 { "bps_rd", "throttling.bps-read" }, 717 { "bps_wr", "throttling.bps-write" }, 718 719 { "iops_max", "throttling.iops-total-max" }, 720 { "iops_rd_max", "throttling.iops-read-max" }, 721 { "iops_wr_max", "throttling.iops-write-max" }, 722 723 { "bps_max", "throttling.bps-total-max" }, 724 { "bps_rd_max", "throttling.bps-read-max" }, 725 { "bps_wr_max", "throttling.bps-write-max" }, 726 727 { "iops_size", "throttling.iops-size" }, 728 729 { "group", "throttling.group" }, 730 731 { "readonly", "read-only" }, 732 }; 733 734 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 735 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 736 &local_err); 737 if (local_err) { 738 error_report_err(local_err); 739 return NULL; 740 } 741 } 742 743 value = qemu_opt_get(all_opts, "cache"); 744 if (value) { 745 int flags = 0; 746 747 if (bdrv_parse_cache_flags(value, &flags) != 0) { 748 error_report("invalid cache option"); 749 return NULL; 750 } 751 752 /* Specific options take precedence */ 753 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 754 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 755 !!(flags & BDRV_O_CACHE_WB), &error_abort); 756 } 757 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 758 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 759 !!(flags & BDRV_O_NOCACHE), &error_abort); 760 } 761 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 762 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 763 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 764 } 765 qemu_opt_unset(all_opts, "cache"); 766 } 767 768 /* Get a QDict for processing the options */ 769 bs_opts = qdict_new(); 770 qemu_opts_to_qdict(all_opts, bs_opts); 771 772 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 773 &error_abort); 774 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 775 if (local_err) { 776 error_report_err(local_err); 777 goto fail; 778 } 779 780 /* Deprecated option boot=[on|off] */ 781 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 782 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 783 "ignored. Future versions will reject this parameter. Please " 784 "update your scripts.\n"); 785 } 786 787 /* Media type */ 788 value = qemu_opt_get(legacy_opts, "media"); 789 if (value) { 790 if (!strcmp(value, "disk")) { 791 media = MEDIA_DISK; 792 } else if (!strcmp(value, "cdrom")) { 793 media = MEDIA_CDROM; 794 read_only = true; 795 } else { 796 error_report("'%s' invalid media", value); 797 goto fail; 798 } 799 } 800 801 /* copy-on-read is disabled with a warning for read-only devices */ 802 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 803 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 804 805 if (read_only && copy_on_read) { 806 error_report("warning: disabling copy-on-read on read-only drive"); 807 copy_on_read = false; 808 } 809 810 qdict_put(bs_opts, "read-only", 811 qstring_from_str(read_only ? "on" : "off")); 812 qdict_put(bs_opts, "copy-on-read", 813 qstring_from_str(copy_on_read ? "on" :"off")); 814 815 /* Controller type */ 816 value = qemu_opt_get(legacy_opts, "if"); 817 if (value) { 818 for (type = 0; 819 type < IF_COUNT && strcmp(value, if_name[type]); 820 type++) { 821 } 822 if (type == IF_COUNT) { 823 error_report("unsupported bus type '%s'", value); 824 goto fail; 825 } 826 } else { 827 type = block_default_type; 828 } 829 830 /* Geometry */ 831 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 832 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 833 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 834 835 if (cyls || heads || secs) { 836 if (cyls < 1) { 837 error_report("invalid physical cyls number"); 838 goto fail; 839 } 840 if (heads < 1) { 841 error_report("invalid physical heads number"); 842 goto fail; 843 } 844 if (secs < 1) { 845 error_report("invalid physical secs number"); 846 goto fail; 847 } 848 } 849 850 translation = BIOS_ATA_TRANSLATION_AUTO; 851 value = qemu_opt_get(legacy_opts, "trans"); 852 if (value != NULL) { 853 if (!cyls) { 854 error_report("'%s' trans must be used with cyls, heads and secs", 855 value); 856 goto fail; 857 } 858 if (!strcmp(value, "none")) { 859 translation = BIOS_ATA_TRANSLATION_NONE; 860 } else if (!strcmp(value, "lba")) { 861 translation = BIOS_ATA_TRANSLATION_LBA; 862 } else if (!strcmp(value, "large")) { 863 translation = BIOS_ATA_TRANSLATION_LARGE; 864 } else if (!strcmp(value, "rechs")) { 865 translation = BIOS_ATA_TRANSLATION_RECHS; 866 } else if (!strcmp(value, "auto")) { 867 translation = BIOS_ATA_TRANSLATION_AUTO; 868 } else { 869 error_report("'%s' invalid translation type", value); 870 goto fail; 871 } 872 } 873 874 if (media == MEDIA_CDROM) { 875 if (cyls || secs || heads) { 876 error_report("CHS can't be set with media=cdrom"); 877 goto fail; 878 } 879 } 880 881 /* Device address specified by bus/unit or index. 882 * If none was specified, try to find the first free one. */ 883 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 884 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 885 index = qemu_opt_get_number(legacy_opts, "index", -1); 886 887 max_devs = if_max_devs[type]; 888 889 if (index != -1) { 890 if (bus_id != 0 || unit_id != -1) { 891 error_report("index cannot be used with bus and unit"); 892 goto fail; 893 } 894 bus_id = drive_index_to_bus_id(type, index); 895 unit_id = drive_index_to_unit_id(type, index); 896 } 897 898 if (unit_id == -1) { 899 unit_id = 0; 900 while (drive_get(type, bus_id, unit_id) != NULL) { 901 unit_id++; 902 if (max_devs && unit_id >= max_devs) { 903 unit_id -= max_devs; 904 bus_id++; 905 } 906 } 907 } 908 909 if (max_devs && unit_id >= max_devs) { 910 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 911 goto fail; 912 } 913 914 if (drive_get(type, bus_id, unit_id) != NULL) { 915 error_report("drive with bus=%d, unit=%d (index=%d) exists", 916 bus_id, unit_id, index); 917 goto fail; 918 } 919 920 /* Serial number */ 921 serial = qemu_opt_get(legacy_opts, "serial"); 922 923 /* no id supplied -> create one */ 924 if (qemu_opts_id(all_opts) == NULL) { 925 char *new_id; 926 const char *mediastr = ""; 927 if (type == IF_IDE || type == IF_SCSI) { 928 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 929 } 930 if (max_devs) { 931 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 932 mediastr, unit_id); 933 } else { 934 new_id = g_strdup_printf("%s%s%i", if_name[type], 935 mediastr, unit_id); 936 } 937 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 938 g_free(new_id); 939 } 940 941 /* Add virtio block device */ 942 devaddr = qemu_opt_get(legacy_opts, "addr"); 943 if (devaddr && type != IF_VIRTIO) { 944 error_report("addr is not supported by this bus type"); 945 goto fail; 946 } 947 948 if (type == IF_VIRTIO) { 949 QemuOpts *devopts; 950 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 951 &error_abort); 952 if (arch_type == QEMU_ARCH_S390X) { 953 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 954 } else { 955 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 956 } 957 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 958 &error_abort); 959 if (devaddr) { 960 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 961 } 962 } 963 964 filename = qemu_opt_get(legacy_opts, "file"); 965 966 /* Check werror/rerror compatibility with if=... */ 967 werror = qemu_opt_get(legacy_opts, "werror"); 968 if (werror != NULL) { 969 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 970 type != IF_NONE) { 971 error_report("werror is not supported by this bus type"); 972 goto fail; 973 } 974 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 975 } 976 977 rerror = qemu_opt_get(legacy_opts, "rerror"); 978 if (rerror != NULL) { 979 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 980 type != IF_NONE) { 981 error_report("rerror is not supported by this bus type"); 982 goto fail; 983 } 984 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 985 } 986 987 /* Actual block device init: Functionality shared with blockdev-add */ 988 blk = blockdev_init(filename, bs_opts, &local_err); 989 bs_opts = NULL; 990 if (!blk) { 991 if (local_err) { 992 error_report_err(local_err); 993 } 994 goto fail; 995 } else { 996 assert(!local_err); 997 } 998 999 /* Create legacy DriveInfo */ 1000 dinfo = g_malloc0(sizeof(*dinfo)); 1001 dinfo->opts = all_opts; 1002 1003 dinfo->cyls = cyls; 1004 dinfo->heads = heads; 1005 dinfo->secs = secs; 1006 dinfo->trans = translation; 1007 1008 dinfo->type = type; 1009 dinfo->bus = bus_id; 1010 dinfo->unit = unit_id; 1011 dinfo->devaddr = devaddr; 1012 dinfo->serial = g_strdup(serial); 1013 1014 blk_set_legacy_dinfo(blk, dinfo); 1015 1016 switch(type) { 1017 case IF_IDE: 1018 case IF_SCSI: 1019 case IF_XEN: 1020 case IF_NONE: 1021 dinfo->media_cd = media == MEDIA_CDROM; 1022 break; 1023 default: 1024 break; 1025 } 1026 1027 fail: 1028 qemu_opts_del(legacy_opts); 1029 QDECREF(bs_opts); 1030 return dinfo; 1031 } 1032 1033 void hmp_commit(Monitor *mon, const QDict *qdict) 1034 { 1035 const char *device = qdict_get_str(qdict, "device"); 1036 BlockBackend *blk; 1037 int ret; 1038 1039 if (!strcmp(device, "all")) { 1040 ret = bdrv_commit_all(); 1041 } else { 1042 blk = blk_by_name(device); 1043 if (!blk) { 1044 monitor_printf(mon, "Device '%s' not found\n", device); 1045 return; 1046 } 1047 ret = bdrv_commit(blk_bs(blk)); 1048 } 1049 if (ret < 0) { 1050 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1051 strerror(-ret)); 1052 } 1053 } 1054 1055 static void blockdev_do_action(int kind, void *data, Error **errp) 1056 { 1057 TransactionAction action; 1058 TransactionActionList list; 1059 1060 action.kind = kind; 1061 action.data = data; 1062 list.value = &action; 1063 list.next = NULL; 1064 qmp_transaction(&list, errp); 1065 } 1066 1067 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1068 bool has_node_name, const char *node_name, 1069 const char *snapshot_file, 1070 bool has_snapshot_node_name, 1071 const char *snapshot_node_name, 1072 bool has_format, const char *format, 1073 bool has_mode, NewImageMode mode, Error **errp) 1074 { 1075 BlockdevSnapshot snapshot = { 1076 .has_device = has_device, 1077 .device = (char *) device, 1078 .has_node_name = has_node_name, 1079 .node_name = (char *) node_name, 1080 .snapshot_file = (char *) snapshot_file, 1081 .has_snapshot_node_name = has_snapshot_node_name, 1082 .snapshot_node_name = (char *) snapshot_node_name, 1083 .has_format = has_format, 1084 .format = (char *) format, 1085 .has_mode = has_mode, 1086 .mode = mode, 1087 }; 1088 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1089 &snapshot, errp); 1090 } 1091 1092 void qmp_blockdev_snapshot_internal_sync(const char *device, 1093 const char *name, 1094 Error **errp) 1095 { 1096 BlockdevSnapshotInternal snapshot = { 1097 .device = (char *) device, 1098 .name = (char *) name 1099 }; 1100 1101 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1102 &snapshot, errp); 1103 } 1104 1105 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1106 bool has_id, 1107 const char *id, 1108 bool has_name, 1109 const char *name, 1110 Error **errp) 1111 { 1112 BlockDriverState *bs; 1113 BlockBackend *blk; 1114 AioContext *aio_context; 1115 QEMUSnapshotInfo sn; 1116 Error *local_err = NULL; 1117 SnapshotInfo *info = NULL; 1118 int ret; 1119 1120 blk = blk_by_name(device); 1121 if (!blk) { 1122 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1123 "Device '%s' not found", device); 1124 return NULL; 1125 } 1126 bs = blk_bs(blk); 1127 1128 if (!has_id) { 1129 id = NULL; 1130 } 1131 1132 if (!has_name) { 1133 name = NULL; 1134 } 1135 1136 if (!id && !name) { 1137 error_setg(errp, "Name or id must be provided"); 1138 return NULL; 1139 } 1140 1141 aio_context = bdrv_get_aio_context(bs); 1142 aio_context_acquire(aio_context); 1143 1144 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1145 goto out_aio_context; 1146 } 1147 1148 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1149 if (local_err) { 1150 error_propagate(errp, local_err); 1151 goto out_aio_context; 1152 } 1153 if (!ret) { 1154 error_setg(errp, 1155 "Snapshot with id '%s' and name '%s' does not exist on " 1156 "device '%s'", 1157 STR_OR_NULL(id), STR_OR_NULL(name), device); 1158 goto out_aio_context; 1159 } 1160 1161 bdrv_snapshot_delete(bs, id, name, &local_err); 1162 if (local_err) { 1163 error_propagate(errp, local_err); 1164 goto out_aio_context; 1165 } 1166 1167 aio_context_release(aio_context); 1168 1169 info = g_new0(SnapshotInfo, 1); 1170 info->id = g_strdup(sn.id_str); 1171 info->name = g_strdup(sn.name); 1172 info->date_nsec = sn.date_nsec; 1173 info->date_sec = sn.date_sec; 1174 info->vm_state_size = sn.vm_state_size; 1175 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1176 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1177 1178 return info; 1179 1180 out_aio_context: 1181 aio_context_release(aio_context); 1182 return NULL; 1183 } 1184 1185 /** 1186 * block_dirty_bitmap_lookup: 1187 * Return a dirty bitmap (if present), after validating 1188 * the node reference and bitmap names. 1189 * 1190 * @node: The name of the BDS node to search for bitmaps 1191 * @name: The name of the bitmap to search for 1192 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1193 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1194 * @errp: Output pointer for error information. Can be NULL. 1195 * 1196 * @return: A bitmap object on success, or NULL on failure. 1197 */ 1198 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1199 const char *name, 1200 BlockDriverState **pbs, 1201 AioContext **paio, 1202 Error **errp) 1203 { 1204 BlockDriverState *bs; 1205 BdrvDirtyBitmap *bitmap; 1206 AioContext *aio_context; 1207 1208 if (!node) { 1209 error_setg(errp, "Node cannot be NULL"); 1210 return NULL; 1211 } 1212 if (!name) { 1213 error_setg(errp, "Bitmap name cannot be NULL"); 1214 return NULL; 1215 } 1216 bs = bdrv_lookup_bs(node, node, NULL); 1217 if (!bs) { 1218 error_setg(errp, "Node '%s' not found", node); 1219 return NULL; 1220 } 1221 1222 aio_context = bdrv_get_aio_context(bs); 1223 aio_context_acquire(aio_context); 1224 1225 bitmap = bdrv_find_dirty_bitmap(bs, name); 1226 if (!bitmap) { 1227 error_setg(errp, "Dirty bitmap '%s' not found", name); 1228 goto fail; 1229 } 1230 1231 if (pbs) { 1232 *pbs = bs; 1233 } 1234 if (paio) { 1235 *paio = aio_context; 1236 } else { 1237 aio_context_release(aio_context); 1238 } 1239 1240 return bitmap; 1241 1242 fail: 1243 aio_context_release(aio_context); 1244 return NULL; 1245 } 1246 1247 /* New and old BlockDriverState structs for atomic group operations */ 1248 1249 typedef struct BlkTransactionState BlkTransactionState; 1250 1251 /* Only prepare() may fail. In a single transaction, only one of commit() or 1252 abort() will be called, clean() will always be called if it present. */ 1253 typedef struct BdrvActionOps { 1254 /* Size of state struct, in bytes. */ 1255 size_t instance_size; 1256 /* Prepare the work, must NOT be NULL. */ 1257 void (*prepare)(BlkTransactionState *common, Error **errp); 1258 /* Commit the changes, can be NULL. */ 1259 void (*commit)(BlkTransactionState *common); 1260 /* Abort the changes on fail, can be NULL. */ 1261 void (*abort)(BlkTransactionState *common); 1262 /* Clean up resource in the end, can be NULL. */ 1263 void (*clean)(BlkTransactionState *common); 1264 } BdrvActionOps; 1265 1266 /* 1267 * This structure must be arranged as first member in child type, assuming 1268 * that compiler will also arrange it to the same address with parent instance. 1269 * Later it will be used in free(). 1270 */ 1271 struct BlkTransactionState { 1272 TransactionAction *action; 1273 const BdrvActionOps *ops; 1274 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1275 }; 1276 1277 /* internal snapshot private data */ 1278 typedef struct InternalSnapshotState { 1279 BlkTransactionState common; 1280 BlockDriverState *bs; 1281 AioContext *aio_context; 1282 QEMUSnapshotInfo sn; 1283 } InternalSnapshotState; 1284 1285 static void internal_snapshot_prepare(BlkTransactionState *common, 1286 Error **errp) 1287 { 1288 Error *local_err = NULL; 1289 const char *device; 1290 const char *name; 1291 BlockBackend *blk; 1292 BlockDriverState *bs; 1293 QEMUSnapshotInfo old_sn, *sn; 1294 bool ret; 1295 qemu_timeval tv; 1296 BlockdevSnapshotInternal *internal; 1297 InternalSnapshotState *state; 1298 int ret1; 1299 1300 g_assert(common->action->kind == 1301 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1302 internal = common->action->blockdev_snapshot_internal_sync; 1303 state = DO_UPCAST(InternalSnapshotState, common, common); 1304 1305 /* 1. parse input */ 1306 device = internal->device; 1307 name = internal->name; 1308 1309 /* 2. check for validation */ 1310 blk = blk_by_name(device); 1311 if (!blk) { 1312 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1313 "Device '%s' not found", device); 1314 return; 1315 } 1316 bs = blk_bs(blk); 1317 1318 /* AioContext is released in .clean() */ 1319 state->aio_context = bdrv_get_aio_context(bs); 1320 aio_context_acquire(state->aio_context); 1321 1322 if (!bdrv_is_inserted(bs)) { 1323 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1324 return; 1325 } 1326 1327 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1328 return; 1329 } 1330 1331 if (bdrv_is_read_only(bs)) { 1332 error_setg(errp, "Device '%s' is read only", device); 1333 return; 1334 } 1335 1336 if (!bdrv_can_snapshot(bs)) { 1337 error_setg(errp, "Block format '%s' used by device '%s' " 1338 "does not support internal snapshots", 1339 bs->drv->format_name, device); 1340 return; 1341 } 1342 1343 if (!strlen(name)) { 1344 error_setg(errp, "Name is empty"); 1345 return; 1346 } 1347 1348 /* check whether a snapshot with name exist */ 1349 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1350 &local_err); 1351 if (local_err) { 1352 error_propagate(errp, local_err); 1353 return; 1354 } else if (ret) { 1355 error_setg(errp, 1356 "Snapshot with name '%s' already exists on device '%s'", 1357 name, device); 1358 return; 1359 } 1360 1361 /* 3. take the snapshot */ 1362 sn = &state->sn; 1363 pstrcpy(sn->name, sizeof(sn->name), name); 1364 qemu_gettimeofday(&tv); 1365 sn->date_sec = tv.tv_sec; 1366 sn->date_nsec = tv.tv_usec * 1000; 1367 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1368 1369 ret1 = bdrv_snapshot_create(bs, sn); 1370 if (ret1 < 0) { 1371 error_setg_errno(errp, -ret1, 1372 "Failed to create snapshot '%s' on device '%s'", 1373 name, device); 1374 return; 1375 } 1376 1377 /* 4. succeed, mark a snapshot is created */ 1378 state->bs = bs; 1379 } 1380 1381 static void internal_snapshot_abort(BlkTransactionState *common) 1382 { 1383 InternalSnapshotState *state = 1384 DO_UPCAST(InternalSnapshotState, common, common); 1385 BlockDriverState *bs = state->bs; 1386 QEMUSnapshotInfo *sn = &state->sn; 1387 Error *local_error = NULL; 1388 1389 if (!bs) { 1390 return; 1391 } 1392 1393 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1394 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1395 "device '%s' in abort: %s", 1396 sn->id_str, 1397 sn->name, 1398 bdrv_get_device_name(bs), 1399 error_get_pretty(local_error)); 1400 error_free(local_error); 1401 } 1402 } 1403 1404 static void internal_snapshot_clean(BlkTransactionState *common) 1405 { 1406 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1407 common, common); 1408 1409 if (state->aio_context) { 1410 aio_context_release(state->aio_context); 1411 } 1412 } 1413 1414 /* external snapshot private data */ 1415 typedef struct ExternalSnapshotState { 1416 BlkTransactionState common; 1417 BlockDriverState *old_bs; 1418 BlockDriverState *new_bs; 1419 AioContext *aio_context; 1420 } ExternalSnapshotState; 1421 1422 static void external_snapshot_prepare(BlkTransactionState *common, 1423 Error **errp) 1424 { 1425 BlockDriver *drv; 1426 int flags, ret; 1427 QDict *options = NULL; 1428 Error *local_err = NULL; 1429 bool has_device = false; 1430 const char *device; 1431 bool has_node_name = false; 1432 const char *node_name; 1433 bool has_snapshot_node_name = false; 1434 const char *snapshot_node_name; 1435 const char *new_image_file; 1436 const char *format = "qcow2"; 1437 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1438 ExternalSnapshotState *state = 1439 DO_UPCAST(ExternalSnapshotState, common, common); 1440 TransactionAction *action = common->action; 1441 1442 /* get parameters */ 1443 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1444 1445 has_device = action->blockdev_snapshot_sync->has_device; 1446 device = action->blockdev_snapshot_sync->device; 1447 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1448 node_name = action->blockdev_snapshot_sync->node_name; 1449 has_snapshot_node_name = 1450 action->blockdev_snapshot_sync->has_snapshot_node_name; 1451 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1452 1453 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1454 if (action->blockdev_snapshot_sync->has_format) { 1455 format = action->blockdev_snapshot_sync->format; 1456 } 1457 if (action->blockdev_snapshot_sync->has_mode) { 1458 mode = action->blockdev_snapshot_sync->mode; 1459 } 1460 1461 /* start processing */ 1462 drv = bdrv_find_format(format); 1463 if (!drv) { 1464 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1465 return; 1466 } 1467 1468 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1469 has_node_name ? node_name : NULL, 1470 &local_err); 1471 if (local_err) { 1472 error_propagate(errp, local_err); 1473 return; 1474 } 1475 1476 if (has_node_name && !has_snapshot_node_name) { 1477 error_setg(errp, "New snapshot node name missing"); 1478 return; 1479 } 1480 1481 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1482 error_setg(errp, "New snapshot node name already existing"); 1483 return; 1484 } 1485 1486 /* Acquire AioContext now so any threads operating on old_bs stop */ 1487 state->aio_context = bdrv_get_aio_context(state->old_bs); 1488 aio_context_acquire(state->aio_context); 1489 1490 if (!bdrv_is_inserted(state->old_bs)) { 1491 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1492 return; 1493 } 1494 1495 if (bdrv_op_is_blocked(state->old_bs, 1496 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1497 return; 1498 } 1499 1500 if (!bdrv_is_read_only(state->old_bs)) { 1501 if (bdrv_flush(state->old_bs)) { 1502 error_setg(errp, QERR_IO_ERROR); 1503 return; 1504 } 1505 } 1506 1507 if (!bdrv_is_first_non_filter(state->old_bs)) { 1508 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1509 return; 1510 } 1511 1512 flags = state->old_bs->open_flags; 1513 1514 /* create new image w/backing file */ 1515 if (mode != NEW_IMAGE_MODE_EXISTING) { 1516 bdrv_img_create(new_image_file, format, 1517 state->old_bs->filename, 1518 state->old_bs->drv->format_name, 1519 NULL, -1, flags, &local_err, false); 1520 if (local_err) { 1521 error_propagate(errp, local_err); 1522 return; 1523 } 1524 } 1525 1526 if (has_snapshot_node_name) { 1527 options = qdict_new(); 1528 qdict_put(options, "node-name", 1529 qstring_from_str(snapshot_node_name)); 1530 } 1531 1532 /* TODO Inherit bs->options or only take explicit options with an 1533 * extended QMP command? */ 1534 assert(state->new_bs == NULL); 1535 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1536 flags | BDRV_O_NO_BACKING, drv, &local_err); 1537 /* We will manually add the backing_hd field to the bs later */ 1538 if (ret != 0) { 1539 error_propagate(errp, local_err); 1540 } 1541 } 1542 1543 static void external_snapshot_commit(BlkTransactionState *common) 1544 { 1545 ExternalSnapshotState *state = 1546 DO_UPCAST(ExternalSnapshotState, common, common); 1547 1548 bdrv_set_aio_context(state->new_bs, state->aio_context); 1549 1550 /* This removes our old bs and adds the new bs */ 1551 bdrv_append(state->new_bs, state->old_bs); 1552 /* We don't need (or want) to use the transactional 1553 * bdrv_reopen_multiple() across all the entries at once, because we 1554 * don't want to abort all of them if one of them fails the reopen */ 1555 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1556 NULL); 1557 1558 aio_context_release(state->aio_context); 1559 } 1560 1561 static void external_snapshot_abort(BlkTransactionState *common) 1562 { 1563 ExternalSnapshotState *state = 1564 DO_UPCAST(ExternalSnapshotState, common, common); 1565 if (state->new_bs) { 1566 bdrv_unref(state->new_bs); 1567 } 1568 if (state->aio_context) { 1569 aio_context_release(state->aio_context); 1570 } 1571 } 1572 1573 typedef struct DriveBackupState { 1574 BlkTransactionState common; 1575 BlockDriverState *bs; 1576 AioContext *aio_context; 1577 BlockJob *job; 1578 } DriveBackupState; 1579 1580 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1581 { 1582 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1583 BlockDriverState *bs; 1584 BlockBackend *blk; 1585 DriveBackup *backup; 1586 Error *local_err = NULL; 1587 1588 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1589 backup = common->action->drive_backup; 1590 1591 blk = blk_by_name(backup->device); 1592 if (!blk) { 1593 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1594 "Device '%s' not found", backup->device); 1595 return; 1596 } 1597 bs = blk_bs(blk); 1598 1599 /* AioContext is released in .clean() */ 1600 state->aio_context = bdrv_get_aio_context(bs); 1601 aio_context_acquire(state->aio_context); 1602 1603 qmp_drive_backup(backup->device, backup->target, 1604 backup->has_format, backup->format, 1605 backup->sync, 1606 backup->has_mode, backup->mode, 1607 backup->has_speed, backup->speed, 1608 backup->has_bitmap, backup->bitmap, 1609 backup->has_on_source_error, backup->on_source_error, 1610 backup->has_on_target_error, backup->on_target_error, 1611 &local_err); 1612 if (local_err) { 1613 error_propagate(errp, local_err); 1614 return; 1615 } 1616 1617 state->bs = bs; 1618 state->job = state->bs->job; 1619 } 1620 1621 static void drive_backup_abort(BlkTransactionState *common) 1622 { 1623 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1624 BlockDriverState *bs = state->bs; 1625 1626 /* Only cancel if it's the job we started */ 1627 if (bs && bs->job && bs->job == state->job) { 1628 block_job_cancel_sync(bs->job); 1629 } 1630 } 1631 1632 static void drive_backup_clean(BlkTransactionState *common) 1633 { 1634 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1635 1636 if (state->aio_context) { 1637 aio_context_release(state->aio_context); 1638 } 1639 } 1640 1641 typedef struct BlockdevBackupState { 1642 BlkTransactionState common; 1643 BlockDriverState *bs; 1644 BlockJob *job; 1645 AioContext *aio_context; 1646 } BlockdevBackupState; 1647 1648 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1649 { 1650 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1651 BlockdevBackup *backup; 1652 BlockDriverState *bs, *target; 1653 BlockBackend *blk; 1654 Error *local_err = NULL; 1655 1656 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1657 backup = common->action->blockdev_backup; 1658 1659 blk = blk_by_name(backup->device); 1660 if (!blk) { 1661 error_setg(errp, "Device '%s' not found", backup->device); 1662 return; 1663 } 1664 bs = blk_bs(blk); 1665 1666 blk = blk_by_name(backup->target); 1667 if (!blk) { 1668 error_setg(errp, "Device '%s' not found", backup->target); 1669 return; 1670 } 1671 target = blk_bs(blk); 1672 1673 /* AioContext is released in .clean() */ 1674 state->aio_context = bdrv_get_aio_context(bs); 1675 if (state->aio_context != bdrv_get_aio_context(target)) { 1676 state->aio_context = NULL; 1677 error_setg(errp, "Backup between two IO threads is not implemented"); 1678 return; 1679 } 1680 aio_context_acquire(state->aio_context); 1681 1682 qmp_blockdev_backup(backup->device, backup->target, 1683 backup->sync, 1684 backup->has_speed, backup->speed, 1685 backup->has_on_source_error, backup->on_source_error, 1686 backup->has_on_target_error, backup->on_target_error, 1687 &local_err); 1688 if (local_err) { 1689 error_propagate(errp, local_err); 1690 return; 1691 } 1692 1693 state->bs = bs; 1694 state->job = state->bs->job; 1695 } 1696 1697 static void blockdev_backup_abort(BlkTransactionState *common) 1698 { 1699 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1700 BlockDriverState *bs = state->bs; 1701 1702 /* Only cancel if it's the job we started */ 1703 if (bs && bs->job && bs->job == state->job) { 1704 block_job_cancel_sync(bs->job); 1705 } 1706 } 1707 1708 static void blockdev_backup_clean(BlkTransactionState *common) 1709 { 1710 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1711 1712 if (state->aio_context) { 1713 aio_context_release(state->aio_context); 1714 } 1715 } 1716 1717 static void abort_prepare(BlkTransactionState *common, Error **errp) 1718 { 1719 error_setg(errp, "Transaction aborted using Abort action"); 1720 } 1721 1722 static void abort_commit(BlkTransactionState *common) 1723 { 1724 g_assert_not_reached(); /* this action never succeeds */ 1725 } 1726 1727 static const BdrvActionOps actions[] = { 1728 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1729 .instance_size = sizeof(ExternalSnapshotState), 1730 .prepare = external_snapshot_prepare, 1731 .commit = external_snapshot_commit, 1732 .abort = external_snapshot_abort, 1733 }, 1734 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1735 .instance_size = sizeof(DriveBackupState), 1736 .prepare = drive_backup_prepare, 1737 .abort = drive_backup_abort, 1738 .clean = drive_backup_clean, 1739 }, 1740 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1741 .instance_size = sizeof(BlockdevBackupState), 1742 .prepare = blockdev_backup_prepare, 1743 .abort = blockdev_backup_abort, 1744 .clean = blockdev_backup_clean, 1745 }, 1746 [TRANSACTION_ACTION_KIND_ABORT] = { 1747 .instance_size = sizeof(BlkTransactionState), 1748 .prepare = abort_prepare, 1749 .commit = abort_commit, 1750 }, 1751 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1752 .instance_size = sizeof(InternalSnapshotState), 1753 .prepare = internal_snapshot_prepare, 1754 .abort = internal_snapshot_abort, 1755 .clean = internal_snapshot_clean, 1756 }, 1757 }; 1758 1759 /* 1760 * 'Atomic' group operations. The operations are performed as a set, and if 1761 * any fail then we roll back all operations in the group. 1762 */ 1763 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1764 { 1765 TransactionActionList *dev_entry = dev_list; 1766 BlkTransactionState *state, *next; 1767 Error *local_err = NULL; 1768 1769 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1770 QSIMPLEQ_INIT(&snap_bdrv_states); 1771 1772 /* drain all i/o before any operations */ 1773 bdrv_drain_all(); 1774 1775 /* We don't do anything in this loop that commits us to the operations */ 1776 while (NULL != dev_entry) { 1777 TransactionAction *dev_info = NULL; 1778 const BdrvActionOps *ops; 1779 1780 dev_info = dev_entry->value; 1781 dev_entry = dev_entry->next; 1782 1783 assert(dev_info->kind < ARRAY_SIZE(actions)); 1784 1785 ops = &actions[dev_info->kind]; 1786 assert(ops->instance_size > 0); 1787 1788 state = g_malloc0(ops->instance_size); 1789 state->ops = ops; 1790 state->action = dev_info; 1791 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1792 1793 state->ops->prepare(state, &local_err); 1794 if (local_err) { 1795 error_propagate(errp, local_err); 1796 goto delete_and_fail; 1797 } 1798 } 1799 1800 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1801 if (state->ops->commit) { 1802 state->ops->commit(state); 1803 } 1804 } 1805 1806 /* success */ 1807 goto exit; 1808 1809 delete_and_fail: 1810 /* failure, and it is all-or-none; roll back all operations */ 1811 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1812 if (state->ops->abort) { 1813 state->ops->abort(state); 1814 } 1815 } 1816 exit: 1817 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1818 if (state->ops->clean) { 1819 state->ops->clean(state); 1820 } 1821 g_free(state); 1822 } 1823 } 1824 1825 1826 static void eject_device(BlockBackend *blk, int force, Error **errp) 1827 { 1828 BlockDriverState *bs = blk_bs(blk); 1829 AioContext *aio_context; 1830 1831 aio_context = bdrv_get_aio_context(bs); 1832 aio_context_acquire(aio_context); 1833 1834 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1835 goto out; 1836 } 1837 if (!blk_dev_has_removable_media(blk)) { 1838 error_setg(errp, "Device '%s' is not removable", 1839 bdrv_get_device_name(bs)); 1840 goto out; 1841 } 1842 1843 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1844 blk_dev_eject_request(blk, force); 1845 if (!force) { 1846 error_setg(errp, "Device '%s' is locked", 1847 bdrv_get_device_name(bs)); 1848 goto out; 1849 } 1850 } 1851 1852 bdrv_close(bs); 1853 1854 out: 1855 aio_context_release(aio_context); 1856 } 1857 1858 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1859 { 1860 BlockBackend *blk; 1861 1862 blk = blk_by_name(device); 1863 if (!blk) { 1864 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1865 "Device '%s' not found", device); 1866 return; 1867 } 1868 1869 eject_device(blk, force, errp); 1870 } 1871 1872 void qmp_block_passwd(bool has_device, const char *device, 1873 bool has_node_name, const char *node_name, 1874 const char *password, Error **errp) 1875 { 1876 Error *local_err = NULL; 1877 BlockDriverState *bs; 1878 AioContext *aio_context; 1879 1880 bs = bdrv_lookup_bs(has_device ? device : NULL, 1881 has_node_name ? node_name : NULL, 1882 &local_err); 1883 if (local_err) { 1884 error_propagate(errp, local_err); 1885 return; 1886 } 1887 1888 aio_context = bdrv_get_aio_context(bs); 1889 aio_context_acquire(aio_context); 1890 1891 bdrv_add_key(bs, password, errp); 1892 1893 aio_context_release(aio_context); 1894 } 1895 1896 /* Assumes AioContext is held */ 1897 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1898 int bdrv_flags, BlockDriver *drv, 1899 const char *password, Error **errp) 1900 { 1901 Error *local_err = NULL; 1902 int ret; 1903 1904 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1905 if (ret < 0) { 1906 error_propagate(errp, local_err); 1907 return; 1908 } 1909 1910 bdrv_add_key(bs, password, errp); 1911 } 1912 1913 void qmp_change_blockdev(const char *device, const char *filename, 1914 const char *format, Error **errp) 1915 { 1916 BlockBackend *blk; 1917 BlockDriverState *bs; 1918 AioContext *aio_context; 1919 BlockDriver *drv = NULL; 1920 int bdrv_flags; 1921 Error *err = NULL; 1922 1923 blk = blk_by_name(device); 1924 if (!blk) { 1925 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1926 "Device '%s' not found", device); 1927 return; 1928 } 1929 bs = blk_bs(blk); 1930 1931 aio_context = bdrv_get_aio_context(bs); 1932 aio_context_acquire(aio_context); 1933 1934 if (format) { 1935 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1936 if (!drv) { 1937 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1938 goto out; 1939 } 1940 } 1941 1942 eject_device(blk, 0, &err); 1943 if (err) { 1944 error_propagate(errp, err); 1945 goto out; 1946 } 1947 1948 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1949 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1950 1951 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1952 1953 out: 1954 aio_context_release(aio_context); 1955 } 1956 1957 /* throttling disk I/O limits */ 1958 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1959 int64_t bps_wr, 1960 int64_t iops, 1961 int64_t iops_rd, 1962 int64_t iops_wr, 1963 bool has_bps_max, 1964 int64_t bps_max, 1965 bool has_bps_rd_max, 1966 int64_t bps_rd_max, 1967 bool has_bps_wr_max, 1968 int64_t bps_wr_max, 1969 bool has_iops_max, 1970 int64_t iops_max, 1971 bool has_iops_rd_max, 1972 int64_t iops_rd_max, 1973 bool has_iops_wr_max, 1974 int64_t iops_wr_max, 1975 bool has_iops_size, 1976 int64_t iops_size, 1977 bool has_group, 1978 const char *group, Error **errp) 1979 { 1980 ThrottleConfig cfg; 1981 BlockDriverState *bs; 1982 BlockBackend *blk; 1983 AioContext *aio_context; 1984 1985 blk = blk_by_name(device); 1986 if (!blk) { 1987 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1988 "Device '%s' not found", device); 1989 return; 1990 } 1991 bs = blk_bs(blk); 1992 1993 memset(&cfg, 0, sizeof(cfg)); 1994 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1995 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1996 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1997 1998 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1999 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 2000 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 2001 2002 if (has_bps_max) { 2003 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 2004 } 2005 if (has_bps_rd_max) { 2006 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 2007 } 2008 if (has_bps_wr_max) { 2009 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 2010 } 2011 if (has_iops_max) { 2012 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 2013 } 2014 if (has_iops_rd_max) { 2015 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 2016 } 2017 if (has_iops_wr_max) { 2018 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 2019 } 2020 2021 if (has_iops_size) { 2022 cfg.op_size = iops_size; 2023 } 2024 2025 if (!check_throttle_config(&cfg, errp)) { 2026 return; 2027 } 2028 2029 aio_context = bdrv_get_aio_context(bs); 2030 aio_context_acquire(aio_context); 2031 2032 if (throttle_enabled(&cfg)) { 2033 /* Enable I/O limits if they're not enabled yet, otherwise 2034 * just update the throttling group. */ 2035 if (!bs->io_limits_enabled) { 2036 bdrv_io_limits_enable(bs, has_group ? group : device); 2037 } else if (has_group) { 2038 bdrv_io_limits_update_group(bs, group); 2039 } 2040 /* Set the new throttling configuration */ 2041 bdrv_set_io_limits(bs, &cfg); 2042 } else if (bs->io_limits_enabled) { 2043 /* If all throttling settings are set to 0, disable I/O limits */ 2044 bdrv_io_limits_disable(bs); 2045 } 2046 2047 aio_context_release(aio_context); 2048 } 2049 2050 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2051 bool has_granularity, uint32_t granularity, 2052 Error **errp) 2053 { 2054 AioContext *aio_context; 2055 BlockDriverState *bs; 2056 2057 if (!name || name[0] == '\0') { 2058 error_setg(errp, "Bitmap name cannot be empty"); 2059 return; 2060 } 2061 2062 bs = bdrv_lookup_bs(node, node, errp); 2063 if (!bs) { 2064 return; 2065 } 2066 2067 aio_context = bdrv_get_aio_context(bs); 2068 aio_context_acquire(aio_context); 2069 2070 if (has_granularity) { 2071 if (granularity < 512 || !is_power_of_2(granularity)) { 2072 error_setg(errp, "Granularity must be power of 2 " 2073 "and at least 512"); 2074 goto out; 2075 } 2076 } else { 2077 /* Default to cluster size, if available: */ 2078 granularity = bdrv_get_default_bitmap_granularity(bs); 2079 } 2080 2081 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2082 2083 out: 2084 aio_context_release(aio_context); 2085 } 2086 2087 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2088 Error **errp) 2089 { 2090 AioContext *aio_context; 2091 BlockDriverState *bs; 2092 BdrvDirtyBitmap *bitmap; 2093 2094 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2095 if (!bitmap || !bs) { 2096 return; 2097 } 2098 2099 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2100 error_setg(errp, 2101 "Bitmap '%s' is currently frozen and cannot be removed", 2102 name); 2103 goto out; 2104 } 2105 bdrv_dirty_bitmap_make_anon(bitmap); 2106 bdrv_release_dirty_bitmap(bs, bitmap); 2107 2108 out: 2109 aio_context_release(aio_context); 2110 } 2111 2112 /** 2113 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2114 * immediately after a full backup operation. 2115 */ 2116 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2117 Error **errp) 2118 { 2119 AioContext *aio_context; 2120 BdrvDirtyBitmap *bitmap; 2121 BlockDriverState *bs; 2122 2123 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2124 if (!bitmap || !bs) { 2125 return; 2126 } 2127 2128 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2129 error_setg(errp, 2130 "Bitmap '%s' is currently frozen and cannot be modified", 2131 name); 2132 goto out; 2133 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2134 error_setg(errp, 2135 "Bitmap '%s' is currently disabled and cannot be cleared", 2136 name); 2137 goto out; 2138 } 2139 2140 bdrv_clear_dirty_bitmap(bitmap); 2141 2142 out: 2143 aio_context_release(aio_context); 2144 } 2145 2146 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2147 { 2148 const char *id = qdict_get_str(qdict, "id"); 2149 BlockBackend *blk; 2150 BlockDriverState *bs; 2151 AioContext *aio_context; 2152 Error *local_err = NULL; 2153 2154 blk = blk_by_name(id); 2155 if (!blk) { 2156 error_report("Device '%s' not found", id); 2157 return; 2158 } 2159 bs = blk_bs(blk); 2160 2161 if (!blk_legacy_dinfo(blk)) { 2162 error_report("Deleting device added with blockdev-add" 2163 " is not supported"); 2164 return; 2165 } 2166 2167 aio_context = bdrv_get_aio_context(bs); 2168 aio_context_acquire(aio_context); 2169 2170 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2171 error_report_err(local_err); 2172 aio_context_release(aio_context); 2173 return; 2174 } 2175 2176 bdrv_close(bs); 2177 2178 /* if we have a device attached to this BlockDriverState 2179 * then we need to make the drive anonymous until the device 2180 * can be removed. If this is a drive with no device backing 2181 * then we can just get rid of the block driver state right here. 2182 */ 2183 if (blk_get_attached_dev(blk)) { 2184 blk_hide_on_behalf_of_hmp_drive_del(blk); 2185 /* Further I/O must not pause the guest */ 2186 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2187 BLOCKDEV_ON_ERROR_REPORT); 2188 } else { 2189 blk_unref(blk); 2190 } 2191 2192 aio_context_release(aio_context); 2193 } 2194 2195 void qmp_block_resize(bool has_device, const char *device, 2196 bool has_node_name, const char *node_name, 2197 int64_t size, Error **errp) 2198 { 2199 Error *local_err = NULL; 2200 BlockDriverState *bs; 2201 AioContext *aio_context; 2202 int ret; 2203 2204 bs = bdrv_lookup_bs(has_device ? device : NULL, 2205 has_node_name ? node_name : NULL, 2206 &local_err); 2207 if (local_err) { 2208 error_propagate(errp, local_err); 2209 return; 2210 } 2211 2212 aio_context = bdrv_get_aio_context(bs); 2213 aio_context_acquire(aio_context); 2214 2215 if (!bdrv_is_first_non_filter(bs)) { 2216 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 2217 goto out; 2218 } 2219 2220 if (size < 0) { 2221 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2222 goto out; 2223 } 2224 2225 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2226 error_setg(errp, QERR_DEVICE_IN_USE, device); 2227 goto out; 2228 } 2229 2230 /* complete all in-flight operations before resizing the device */ 2231 bdrv_drain_all(); 2232 2233 ret = bdrv_truncate(bs, size); 2234 switch (ret) { 2235 case 0: 2236 break; 2237 case -ENOMEDIUM: 2238 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2239 break; 2240 case -ENOTSUP: 2241 error_setg(errp, QERR_UNSUPPORTED); 2242 break; 2243 case -EACCES: 2244 error_setg(errp, "Device '%s' is read only", device); 2245 break; 2246 case -EBUSY: 2247 error_setg(errp, QERR_DEVICE_IN_USE, device); 2248 break; 2249 default: 2250 error_setg_errno(errp, -ret, "Could not resize"); 2251 break; 2252 } 2253 2254 out: 2255 aio_context_release(aio_context); 2256 } 2257 2258 static void block_job_cb(void *opaque, int ret) 2259 { 2260 /* Note that this function may be executed from another AioContext besides 2261 * the QEMU main loop. If you need to access anything that assumes the 2262 * QEMU global mutex, use a BH or introduce a mutex. 2263 */ 2264 2265 BlockDriverState *bs = opaque; 2266 const char *msg = NULL; 2267 2268 trace_block_job_cb(bs, bs->job, ret); 2269 2270 assert(bs->job); 2271 2272 if (ret < 0) { 2273 msg = strerror(-ret); 2274 } 2275 2276 if (block_job_is_cancelled(bs->job)) { 2277 block_job_event_cancelled(bs->job); 2278 } else { 2279 block_job_event_completed(bs->job, msg); 2280 } 2281 2282 bdrv_put_ref_bh_schedule(bs); 2283 } 2284 2285 void qmp_block_stream(const char *device, 2286 bool has_base, const char *base, 2287 bool has_backing_file, const char *backing_file, 2288 bool has_speed, int64_t speed, 2289 bool has_on_error, BlockdevOnError on_error, 2290 Error **errp) 2291 { 2292 BlockBackend *blk; 2293 BlockDriverState *bs; 2294 BlockDriverState *base_bs = NULL; 2295 AioContext *aio_context; 2296 Error *local_err = NULL; 2297 const char *base_name = NULL; 2298 2299 if (!has_on_error) { 2300 on_error = BLOCKDEV_ON_ERROR_REPORT; 2301 } 2302 2303 blk = blk_by_name(device); 2304 if (!blk) { 2305 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2306 "Device '%s' not found", device); 2307 return; 2308 } 2309 bs = blk_bs(blk); 2310 2311 aio_context = bdrv_get_aio_context(bs); 2312 aio_context_acquire(aio_context); 2313 2314 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2315 goto out; 2316 } 2317 2318 if (has_base) { 2319 base_bs = bdrv_find_backing_image(bs, base); 2320 if (base_bs == NULL) { 2321 error_setg(errp, QERR_BASE_NOT_FOUND, base); 2322 goto out; 2323 } 2324 assert(bdrv_get_aio_context(base_bs) == aio_context); 2325 base_name = base; 2326 } 2327 2328 /* if we are streaming the entire chain, the result will have no backing 2329 * file, and specifying one is therefore an error */ 2330 if (base_bs == NULL && has_backing_file) { 2331 error_setg(errp, "backing file specified, but streaming the " 2332 "entire chain"); 2333 goto out; 2334 } 2335 2336 /* backing_file string overrides base bs filename */ 2337 base_name = has_backing_file ? backing_file : base_name; 2338 2339 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2340 on_error, block_job_cb, bs, &local_err); 2341 if (local_err) { 2342 error_propagate(errp, local_err); 2343 goto out; 2344 } 2345 2346 trace_qmp_block_stream(bs, bs->job); 2347 2348 out: 2349 aio_context_release(aio_context); 2350 } 2351 2352 void qmp_block_commit(const char *device, 2353 bool has_base, const char *base, 2354 bool has_top, const char *top, 2355 bool has_backing_file, const char *backing_file, 2356 bool has_speed, int64_t speed, 2357 Error **errp) 2358 { 2359 BlockBackend *blk; 2360 BlockDriverState *bs; 2361 BlockDriverState *base_bs, *top_bs; 2362 AioContext *aio_context; 2363 Error *local_err = NULL; 2364 /* This will be part of the QMP command, if/when the 2365 * BlockdevOnError change for blkmirror makes it in 2366 */ 2367 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2368 2369 if (!has_speed) { 2370 speed = 0; 2371 } 2372 2373 /* Important Note: 2374 * libvirt relies on the DeviceNotFound error class in order to probe for 2375 * live commit feature versions; for this to work, we must make sure to 2376 * perform the device lookup before any generic errors that may occur in a 2377 * scenario in which all optional arguments are omitted. */ 2378 blk = blk_by_name(device); 2379 if (!blk) { 2380 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2381 "Device '%s' not found", device); 2382 return; 2383 } 2384 bs = blk_bs(blk); 2385 2386 aio_context = bdrv_get_aio_context(bs); 2387 aio_context_acquire(aio_context); 2388 2389 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2390 goto out; 2391 } 2392 2393 /* default top_bs is the active layer */ 2394 top_bs = bs; 2395 2396 if (has_top && top) { 2397 if (strcmp(bs->filename, top) != 0) { 2398 top_bs = bdrv_find_backing_image(bs, top); 2399 } 2400 } 2401 2402 if (top_bs == NULL) { 2403 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2404 goto out; 2405 } 2406 2407 assert(bdrv_get_aio_context(top_bs) == aio_context); 2408 2409 if (has_base && base) { 2410 base_bs = bdrv_find_backing_image(top_bs, base); 2411 } else { 2412 base_bs = bdrv_find_base(top_bs); 2413 } 2414 2415 if (base_bs == NULL) { 2416 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2417 goto out; 2418 } 2419 2420 assert(bdrv_get_aio_context(base_bs) == aio_context); 2421 2422 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2423 goto out; 2424 } 2425 2426 /* Do not allow attempts to commit an image into itself */ 2427 if (top_bs == base_bs) { 2428 error_setg(errp, "cannot commit an image into itself"); 2429 goto out; 2430 } 2431 2432 if (top_bs == bs) { 2433 if (has_backing_file) { 2434 error_setg(errp, "'backing-file' specified," 2435 " but 'top' is the active layer"); 2436 goto out; 2437 } 2438 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2439 bs, &local_err); 2440 } else { 2441 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2442 has_backing_file ? backing_file : NULL, &local_err); 2443 } 2444 if (local_err != NULL) { 2445 error_propagate(errp, local_err); 2446 goto out; 2447 } 2448 2449 out: 2450 aio_context_release(aio_context); 2451 } 2452 2453 void qmp_drive_backup(const char *device, const char *target, 2454 bool has_format, const char *format, 2455 enum MirrorSyncMode sync, 2456 bool has_mode, enum NewImageMode mode, 2457 bool has_speed, int64_t speed, 2458 bool has_bitmap, const char *bitmap, 2459 bool has_on_source_error, BlockdevOnError on_source_error, 2460 bool has_on_target_error, BlockdevOnError on_target_error, 2461 Error **errp) 2462 { 2463 BlockBackend *blk; 2464 BlockDriverState *bs; 2465 BlockDriverState *target_bs; 2466 BlockDriverState *source = NULL; 2467 BdrvDirtyBitmap *bmap = NULL; 2468 AioContext *aio_context; 2469 BlockDriver *drv = NULL; 2470 Error *local_err = NULL; 2471 int flags; 2472 int64_t size; 2473 int ret; 2474 2475 if (!has_speed) { 2476 speed = 0; 2477 } 2478 if (!has_on_source_error) { 2479 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2480 } 2481 if (!has_on_target_error) { 2482 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2483 } 2484 if (!has_mode) { 2485 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2486 } 2487 2488 blk = blk_by_name(device); 2489 if (!blk) { 2490 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2491 "Device '%s' not found", device); 2492 return; 2493 } 2494 bs = blk_bs(blk); 2495 2496 aio_context = bdrv_get_aio_context(bs); 2497 aio_context_acquire(aio_context); 2498 2499 /* Although backup_run has this check too, we need to use bs->drv below, so 2500 * do an early check redundantly. */ 2501 if (!bdrv_is_inserted(bs)) { 2502 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2503 goto out; 2504 } 2505 2506 if (!has_format) { 2507 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2508 } 2509 if (format) { 2510 drv = bdrv_find_format(format); 2511 if (!drv) { 2512 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2513 goto out; 2514 } 2515 } 2516 2517 /* Early check to avoid creating target */ 2518 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2519 goto out; 2520 } 2521 2522 flags = bs->open_flags | BDRV_O_RDWR; 2523 2524 /* See if we have a backing HD we can use to create our new image 2525 * on top of. */ 2526 if (sync == MIRROR_SYNC_MODE_TOP) { 2527 source = bs->backing_hd; 2528 if (!source) { 2529 sync = MIRROR_SYNC_MODE_FULL; 2530 } 2531 } 2532 if (sync == MIRROR_SYNC_MODE_NONE) { 2533 source = bs; 2534 } 2535 2536 size = bdrv_getlength(bs); 2537 if (size < 0) { 2538 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2539 goto out; 2540 } 2541 2542 if (mode != NEW_IMAGE_MODE_EXISTING) { 2543 assert(format && drv); 2544 if (source) { 2545 bdrv_img_create(target, format, source->filename, 2546 source->drv->format_name, NULL, 2547 size, flags, &local_err, false); 2548 } else { 2549 bdrv_img_create(target, format, NULL, NULL, NULL, 2550 size, flags, &local_err, false); 2551 } 2552 } 2553 2554 if (local_err) { 2555 error_propagate(errp, local_err); 2556 goto out; 2557 } 2558 2559 target_bs = NULL; 2560 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2561 if (ret < 0) { 2562 error_propagate(errp, local_err); 2563 goto out; 2564 } 2565 2566 bdrv_set_aio_context(target_bs, aio_context); 2567 2568 if (has_bitmap) { 2569 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 2570 if (!bmap) { 2571 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 2572 goto out; 2573 } 2574 } 2575 2576 backup_start(bs, target_bs, speed, sync, bmap, 2577 on_source_error, on_target_error, 2578 block_job_cb, bs, &local_err); 2579 if (local_err != NULL) { 2580 bdrv_unref(target_bs); 2581 error_propagate(errp, local_err); 2582 goto out; 2583 } 2584 2585 out: 2586 aio_context_release(aio_context); 2587 } 2588 2589 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2590 { 2591 return bdrv_named_nodes_list(errp); 2592 } 2593 2594 void qmp_blockdev_backup(const char *device, const char *target, 2595 enum MirrorSyncMode sync, 2596 bool has_speed, int64_t speed, 2597 bool has_on_source_error, 2598 BlockdevOnError on_source_error, 2599 bool has_on_target_error, 2600 BlockdevOnError on_target_error, 2601 Error **errp) 2602 { 2603 BlockBackend *blk; 2604 BlockDriverState *bs; 2605 BlockDriverState *target_bs; 2606 Error *local_err = NULL; 2607 AioContext *aio_context; 2608 2609 if (!has_speed) { 2610 speed = 0; 2611 } 2612 if (!has_on_source_error) { 2613 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2614 } 2615 if (!has_on_target_error) { 2616 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2617 } 2618 2619 blk = blk_by_name(device); 2620 if (!blk) { 2621 error_setg(errp, "Device '%s' not found", device); 2622 return; 2623 } 2624 bs = blk_bs(blk); 2625 2626 aio_context = bdrv_get_aio_context(bs); 2627 aio_context_acquire(aio_context); 2628 2629 blk = blk_by_name(target); 2630 if (!blk) { 2631 error_setg(errp, "Device '%s' not found", target); 2632 goto out; 2633 } 2634 target_bs = blk_bs(blk); 2635 2636 bdrv_ref(target_bs); 2637 bdrv_set_aio_context(target_bs, aio_context); 2638 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 2639 on_target_error, block_job_cb, bs, &local_err); 2640 if (local_err != NULL) { 2641 bdrv_unref(target_bs); 2642 error_propagate(errp, local_err); 2643 } 2644 out: 2645 aio_context_release(aio_context); 2646 } 2647 2648 void qmp_drive_mirror(const char *device, const char *target, 2649 bool has_format, const char *format, 2650 bool has_node_name, const char *node_name, 2651 bool has_replaces, const char *replaces, 2652 enum MirrorSyncMode sync, 2653 bool has_mode, enum NewImageMode mode, 2654 bool has_speed, int64_t speed, 2655 bool has_granularity, uint32_t granularity, 2656 bool has_buf_size, int64_t buf_size, 2657 bool has_on_source_error, BlockdevOnError on_source_error, 2658 bool has_on_target_error, BlockdevOnError on_target_error, 2659 bool has_unmap, bool unmap, 2660 Error **errp) 2661 { 2662 BlockBackend *blk; 2663 BlockDriverState *bs; 2664 BlockDriverState *source, *target_bs; 2665 AioContext *aio_context; 2666 BlockDriver *drv = NULL; 2667 Error *local_err = NULL; 2668 QDict *options = NULL; 2669 int flags; 2670 int64_t size; 2671 int ret; 2672 2673 if (!has_speed) { 2674 speed = 0; 2675 } 2676 if (!has_on_source_error) { 2677 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2678 } 2679 if (!has_on_target_error) { 2680 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2681 } 2682 if (!has_mode) { 2683 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2684 } 2685 if (!has_granularity) { 2686 granularity = 0; 2687 } 2688 if (!has_buf_size) { 2689 buf_size = 0; 2690 } 2691 if (!has_unmap) { 2692 unmap = true; 2693 } 2694 2695 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2696 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2697 "a value in range [512B, 64MB]"); 2698 return; 2699 } 2700 if (granularity & (granularity - 1)) { 2701 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2702 "power of 2"); 2703 return; 2704 } 2705 2706 blk = blk_by_name(device); 2707 if (!blk) { 2708 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2709 "Device '%s' not found", device); 2710 return; 2711 } 2712 bs = blk_bs(blk); 2713 2714 aio_context = bdrv_get_aio_context(bs); 2715 aio_context_acquire(aio_context); 2716 2717 if (!bdrv_is_inserted(bs)) { 2718 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2719 goto out; 2720 } 2721 2722 if (!has_format) { 2723 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2724 } 2725 if (format) { 2726 drv = bdrv_find_format(format); 2727 if (!drv) { 2728 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2729 goto out; 2730 } 2731 } 2732 2733 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2734 goto out; 2735 } 2736 2737 flags = bs->open_flags | BDRV_O_RDWR; 2738 source = bs->backing_hd; 2739 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2740 sync = MIRROR_SYNC_MODE_FULL; 2741 } 2742 if (sync == MIRROR_SYNC_MODE_NONE) { 2743 source = bs; 2744 } 2745 2746 size = bdrv_getlength(bs); 2747 if (size < 0) { 2748 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2749 goto out; 2750 } 2751 2752 if (has_replaces) { 2753 BlockDriverState *to_replace_bs; 2754 AioContext *replace_aio_context; 2755 int64_t replace_size; 2756 2757 if (!has_node_name) { 2758 error_setg(errp, "a node-name must be provided when replacing a" 2759 " named node of the graph"); 2760 goto out; 2761 } 2762 2763 to_replace_bs = check_to_replace_node(bs, replaces, &local_err); 2764 2765 if (!to_replace_bs) { 2766 error_propagate(errp, local_err); 2767 goto out; 2768 } 2769 2770 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2771 aio_context_acquire(replace_aio_context); 2772 replace_size = bdrv_getlength(to_replace_bs); 2773 aio_context_release(replace_aio_context); 2774 2775 if (size != replace_size) { 2776 error_setg(errp, "cannot replace image with a mirror image of " 2777 "different size"); 2778 goto out; 2779 } 2780 } 2781 2782 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2783 && mode != NEW_IMAGE_MODE_EXISTING) 2784 { 2785 /* create new image w/o backing file */ 2786 assert(format && drv); 2787 bdrv_img_create(target, format, 2788 NULL, NULL, NULL, size, flags, &local_err, false); 2789 } else { 2790 switch (mode) { 2791 case NEW_IMAGE_MODE_EXISTING: 2792 break; 2793 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2794 /* create new image with backing file */ 2795 bdrv_img_create(target, format, 2796 source->filename, 2797 source->drv->format_name, 2798 NULL, size, flags, &local_err, false); 2799 break; 2800 default: 2801 abort(); 2802 } 2803 } 2804 2805 if (local_err) { 2806 error_propagate(errp, local_err); 2807 goto out; 2808 } 2809 2810 if (has_node_name) { 2811 options = qdict_new(); 2812 qdict_put(options, "node-name", qstring_from_str(node_name)); 2813 } 2814 2815 /* Mirroring takes care of copy-on-write using the source's backing 2816 * file. 2817 */ 2818 target_bs = NULL; 2819 ret = bdrv_open(&target_bs, target, NULL, options, 2820 flags | BDRV_O_NO_BACKING, drv, &local_err); 2821 if (ret < 0) { 2822 error_propagate(errp, local_err); 2823 goto out; 2824 } 2825 2826 bdrv_set_aio_context(target_bs, aio_context); 2827 2828 /* pass the node name to replace to mirror start since it's loose coupling 2829 * and will allow to check whether the node still exist at mirror completion 2830 */ 2831 mirror_start(bs, target_bs, 2832 has_replaces ? replaces : NULL, 2833 speed, granularity, buf_size, sync, 2834 on_source_error, on_target_error, 2835 unmap, 2836 block_job_cb, bs, &local_err); 2837 if (local_err != NULL) { 2838 bdrv_unref(target_bs); 2839 error_propagate(errp, local_err); 2840 goto out; 2841 } 2842 2843 out: 2844 aio_context_release(aio_context); 2845 } 2846 2847 /* Get the block job for a given device name and acquire its AioContext */ 2848 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2849 Error **errp) 2850 { 2851 BlockBackend *blk; 2852 BlockDriverState *bs; 2853 2854 blk = blk_by_name(device); 2855 if (!blk) { 2856 goto notfound; 2857 } 2858 bs = blk_bs(blk); 2859 2860 *aio_context = bdrv_get_aio_context(bs); 2861 aio_context_acquire(*aio_context); 2862 2863 if (!bs->job) { 2864 aio_context_release(*aio_context); 2865 goto notfound; 2866 } 2867 2868 return bs->job; 2869 2870 notfound: 2871 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2872 "No active block job on device '%s'", device); 2873 *aio_context = NULL; 2874 return NULL; 2875 } 2876 2877 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2878 { 2879 AioContext *aio_context; 2880 BlockJob *job = find_block_job(device, &aio_context, errp); 2881 2882 if (!job) { 2883 return; 2884 } 2885 2886 block_job_set_speed(job, speed, errp); 2887 aio_context_release(aio_context); 2888 } 2889 2890 void qmp_block_job_cancel(const char *device, 2891 bool has_force, bool force, Error **errp) 2892 { 2893 AioContext *aio_context; 2894 BlockJob *job = find_block_job(device, &aio_context, errp); 2895 2896 if (!job) { 2897 return; 2898 } 2899 2900 if (!has_force) { 2901 force = false; 2902 } 2903 2904 if (job->user_paused && !force) { 2905 error_setg(errp, "The block job for device '%s' is currently paused", 2906 device); 2907 goto out; 2908 } 2909 2910 trace_qmp_block_job_cancel(job); 2911 block_job_cancel(job); 2912 out: 2913 aio_context_release(aio_context); 2914 } 2915 2916 void qmp_block_job_pause(const char *device, Error **errp) 2917 { 2918 AioContext *aio_context; 2919 BlockJob *job = find_block_job(device, &aio_context, errp); 2920 2921 if (!job || job->user_paused) { 2922 return; 2923 } 2924 2925 job->user_paused = true; 2926 trace_qmp_block_job_pause(job); 2927 block_job_pause(job); 2928 aio_context_release(aio_context); 2929 } 2930 2931 void qmp_block_job_resume(const char *device, Error **errp) 2932 { 2933 AioContext *aio_context; 2934 BlockJob *job = find_block_job(device, &aio_context, errp); 2935 2936 if (!job || !job->user_paused) { 2937 return; 2938 } 2939 2940 job->user_paused = false; 2941 trace_qmp_block_job_resume(job); 2942 block_job_resume(job); 2943 aio_context_release(aio_context); 2944 } 2945 2946 void qmp_block_job_complete(const char *device, Error **errp) 2947 { 2948 AioContext *aio_context; 2949 BlockJob *job = find_block_job(device, &aio_context, errp); 2950 2951 if (!job) { 2952 return; 2953 } 2954 2955 trace_qmp_block_job_complete(job); 2956 block_job_complete(job, errp); 2957 aio_context_release(aio_context); 2958 } 2959 2960 void qmp_change_backing_file(const char *device, 2961 const char *image_node_name, 2962 const char *backing_file, 2963 Error **errp) 2964 { 2965 BlockBackend *blk; 2966 BlockDriverState *bs = NULL; 2967 AioContext *aio_context; 2968 BlockDriverState *image_bs = NULL; 2969 Error *local_err = NULL; 2970 bool ro; 2971 int open_flags; 2972 int ret; 2973 2974 blk = blk_by_name(device); 2975 if (!blk) { 2976 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2977 "Device '%s' not found", device); 2978 return; 2979 } 2980 bs = blk_bs(blk); 2981 2982 aio_context = bdrv_get_aio_context(bs); 2983 aio_context_acquire(aio_context); 2984 2985 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2986 if (local_err) { 2987 error_propagate(errp, local_err); 2988 goto out; 2989 } 2990 2991 if (!image_bs) { 2992 error_setg(errp, "image file not found"); 2993 goto out; 2994 } 2995 2996 if (bdrv_find_base(image_bs) == image_bs) { 2997 error_setg(errp, "not allowing backing file change on an image " 2998 "without a backing file"); 2999 goto out; 3000 } 3001 3002 /* even though we are not necessarily operating on bs, we need it to 3003 * determine if block ops are currently prohibited on the chain */ 3004 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3005 goto out; 3006 } 3007 3008 /* final sanity check */ 3009 if (!bdrv_chain_contains(bs, image_bs)) { 3010 error_setg(errp, "'%s' and image file are not in the same chain", 3011 device); 3012 goto out; 3013 } 3014 3015 /* if not r/w, reopen to make r/w */ 3016 open_flags = image_bs->open_flags; 3017 ro = bdrv_is_read_only(image_bs); 3018 3019 if (ro) { 3020 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3021 if (local_err) { 3022 error_propagate(errp, local_err); 3023 goto out; 3024 } 3025 } 3026 3027 ret = bdrv_change_backing_file(image_bs, backing_file, 3028 image_bs->drv ? image_bs->drv->format_name : ""); 3029 3030 if (ret < 0) { 3031 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3032 backing_file); 3033 /* don't exit here, so we can try to restore open flags if 3034 * appropriate */ 3035 } 3036 3037 if (ro) { 3038 bdrv_reopen(image_bs, open_flags, &local_err); 3039 if (local_err) { 3040 error_propagate(errp, local_err); /* will preserve prior errp */ 3041 } 3042 } 3043 3044 out: 3045 aio_context_release(aio_context); 3046 } 3047 3048 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3049 { 3050 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3051 BlockBackend *blk; 3052 QObject *obj; 3053 QDict *qdict; 3054 Error *local_err = NULL; 3055 3056 /* Require an ID in the top level */ 3057 if (!options->has_id) { 3058 error_setg(errp, "Block device needs an ID"); 3059 goto fail; 3060 } 3061 3062 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3063 * cache.direct=false instead of silently switching to aio=threads, except 3064 * when called from drive_new(). 3065 * 3066 * For now, simply forbidding the combination for all drivers will do. */ 3067 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3068 bool direct = options->has_cache && 3069 options->cache->has_direct && 3070 options->cache->direct; 3071 if (!direct) { 3072 error_setg(errp, "aio=native requires cache.direct=true"); 3073 goto fail; 3074 } 3075 } 3076 3077 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3078 &options, NULL, &local_err); 3079 if (local_err) { 3080 error_propagate(errp, local_err); 3081 goto fail; 3082 } 3083 3084 obj = qmp_output_get_qobject(ov); 3085 qdict = qobject_to_qdict(obj); 3086 3087 qdict_flatten(qdict); 3088 3089 blk = blockdev_init(NULL, qdict, &local_err); 3090 if (local_err) { 3091 error_propagate(errp, local_err); 3092 goto fail; 3093 } 3094 3095 if (bdrv_key_required(blk_bs(blk))) { 3096 blk_unref(blk); 3097 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3098 goto fail; 3099 } 3100 3101 fail: 3102 qmp_output_visitor_cleanup(ov); 3103 } 3104 3105 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3106 { 3107 BlockJobInfoList *head = NULL, **p_next = &head; 3108 BlockDriverState *bs; 3109 3110 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3111 AioContext *aio_context = bdrv_get_aio_context(bs); 3112 3113 aio_context_acquire(aio_context); 3114 3115 if (bs->job) { 3116 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3117 elem->value = block_job_query(bs->job); 3118 *p_next = elem; 3119 p_next = &elem->next; 3120 } 3121 3122 aio_context_release(aio_context); 3123 } 3124 3125 return head; 3126 } 3127 3128 QemuOptsList qemu_common_drive_opts = { 3129 .name = "drive", 3130 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3131 .desc = { 3132 { 3133 .name = "snapshot", 3134 .type = QEMU_OPT_BOOL, 3135 .help = "enable/disable snapshot mode", 3136 },{ 3137 .name = "discard", 3138 .type = QEMU_OPT_STRING, 3139 .help = "discard operation (ignore/off, unmap/on)", 3140 },{ 3141 .name = BDRV_OPT_CACHE_WB, 3142 .type = QEMU_OPT_BOOL, 3143 .help = "enables writeback mode for any caches", 3144 },{ 3145 .name = BDRV_OPT_CACHE_DIRECT, 3146 .type = QEMU_OPT_BOOL, 3147 .help = "enables use of O_DIRECT (bypass the host page cache)", 3148 },{ 3149 .name = BDRV_OPT_CACHE_NO_FLUSH, 3150 .type = QEMU_OPT_BOOL, 3151 .help = "ignore any flush requests for the device", 3152 },{ 3153 .name = "aio", 3154 .type = QEMU_OPT_STRING, 3155 .help = "host AIO implementation (threads, native)", 3156 },{ 3157 .name = "format", 3158 .type = QEMU_OPT_STRING, 3159 .help = "disk format (raw, qcow2, ...)", 3160 },{ 3161 .name = "rerror", 3162 .type = QEMU_OPT_STRING, 3163 .help = "read error action", 3164 },{ 3165 .name = "werror", 3166 .type = QEMU_OPT_STRING, 3167 .help = "write error action", 3168 },{ 3169 .name = "read-only", 3170 .type = QEMU_OPT_BOOL, 3171 .help = "open drive file as read-only", 3172 },{ 3173 .name = "throttling.iops-total", 3174 .type = QEMU_OPT_NUMBER, 3175 .help = "limit total I/O operations per second", 3176 },{ 3177 .name = "throttling.iops-read", 3178 .type = QEMU_OPT_NUMBER, 3179 .help = "limit read operations per second", 3180 },{ 3181 .name = "throttling.iops-write", 3182 .type = QEMU_OPT_NUMBER, 3183 .help = "limit write operations per second", 3184 },{ 3185 .name = "throttling.bps-total", 3186 .type = QEMU_OPT_NUMBER, 3187 .help = "limit total bytes per second", 3188 },{ 3189 .name = "throttling.bps-read", 3190 .type = QEMU_OPT_NUMBER, 3191 .help = "limit read bytes per second", 3192 },{ 3193 .name = "throttling.bps-write", 3194 .type = QEMU_OPT_NUMBER, 3195 .help = "limit write bytes per second", 3196 },{ 3197 .name = "throttling.iops-total-max", 3198 .type = QEMU_OPT_NUMBER, 3199 .help = "I/O operations burst", 3200 },{ 3201 .name = "throttling.iops-read-max", 3202 .type = QEMU_OPT_NUMBER, 3203 .help = "I/O operations read burst", 3204 },{ 3205 .name = "throttling.iops-write-max", 3206 .type = QEMU_OPT_NUMBER, 3207 .help = "I/O operations write burst", 3208 },{ 3209 .name = "throttling.bps-total-max", 3210 .type = QEMU_OPT_NUMBER, 3211 .help = "total bytes burst", 3212 },{ 3213 .name = "throttling.bps-read-max", 3214 .type = QEMU_OPT_NUMBER, 3215 .help = "total bytes read burst", 3216 },{ 3217 .name = "throttling.bps-write-max", 3218 .type = QEMU_OPT_NUMBER, 3219 .help = "total bytes write burst", 3220 },{ 3221 .name = "throttling.iops-size", 3222 .type = QEMU_OPT_NUMBER, 3223 .help = "when limiting by iops max size of an I/O in bytes", 3224 },{ 3225 .name = "throttling.group", 3226 .type = QEMU_OPT_STRING, 3227 .help = "name of the block throttling group", 3228 },{ 3229 .name = "copy-on-read", 3230 .type = QEMU_OPT_BOOL, 3231 .help = "copy read data from backing file into image file", 3232 },{ 3233 .name = "detect-zeroes", 3234 .type = QEMU_OPT_STRING, 3235 .help = "try to optimize zero writes (off, on, unmap)", 3236 }, 3237 { /* end of list */ } 3238 }, 3239 }; 3240 3241 QemuOptsList qemu_drive_opts = { 3242 .name = "drive", 3243 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3244 .desc = { 3245 /* 3246 * no elements => accept any params 3247 * validation will happen later 3248 */ 3249 { /* end of list */ } 3250 }, 3251 }; 3252