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