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 10 #include "block.h" 11 #include "blockdev.h" 12 #include "monitor.h" 13 #include "qerror.h" 14 #include "qemu-option.h" 15 #include "qemu-config.h" 16 #include "sysemu.h" 17 #include "hw/qdev.h" 18 #include "block_int.h" 19 20 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 21 22 static const char *const if_name[IF_COUNT] = { 23 [IF_NONE] = "none", 24 [IF_IDE] = "ide", 25 [IF_SCSI] = "scsi", 26 [IF_FLOPPY] = "floppy", 27 [IF_PFLASH] = "pflash", 28 [IF_MTD] = "mtd", 29 [IF_SD] = "sd", 30 [IF_VIRTIO] = "virtio", 31 [IF_XEN] = "xen", 32 }; 33 34 static const int if_max_devs[IF_COUNT] = { 35 /* 36 * Do not change these numbers! They govern how drive option 37 * index maps to unit and bus. That mapping is ABI. 38 * 39 * All controllers used to imlement if=T drives need to support 40 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 41 * Otherwise, some index values map to "impossible" bus, unit 42 * values. 43 * 44 * For instance, if you change [IF_SCSI] to 255, -drive 45 * if=scsi,index=12 no longer means bus=1,unit=5, but 46 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 47 * the drive can't be set up. Regression. 48 */ 49 [IF_IDE] = 2, 50 [IF_SCSI] = 7, 51 }; 52 53 /* 54 * We automatically delete the drive when a device using it gets 55 * unplugged. Questionable feature, but we can't just drop it. 56 * Device models call blockdev_mark_auto_del() to schedule the 57 * automatic deletion, and generic qdev code calls blockdev_auto_del() 58 * when deletion is actually safe. 59 */ 60 void blockdev_mark_auto_del(BlockDriverState *bs) 61 { 62 DriveInfo *dinfo = drive_get_by_blockdev(bs); 63 64 if (dinfo) { 65 dinfo->auto_del = 1; 66 } 67 } 68 69 void blockdev_auto_del(BlockDriverState *bs) 70 { 71 DriveInfo *dinfo = drive_get_by_blockdev(bs); 72 73 if (dinfo && dinfo->auto_del) { 74 drive_put_ref(dinfo); 75 } 76 } 77 78 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 79 { 80 int max_devs = if_max_devs[type]; 81 return max_devs ? index / max_devs : 0; 82 } 83 84 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 85 { 86 int max_devs = if_max_devs[type]; 87 return max_devs ? index % max_devs : index; 88 } 89 90 QemuOpts *drive_def(const char *optstr) 91 { 92 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 93 } 94 95 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 96 const char *optstr) 97 { 98 QemuOpts *opts; 99 char buf[32]; 100 101 opts = drive_def(optstr); 102 if (!opts) { 103 return NULL; 104 } 105 if (type != IF_DEFAULT) { 106 qemu_opt_set(opts, "if", if_name[type]); 107 } 108 if (index >= 0) { 109 snprintf(buf, sizeof(buf), "%d", index); 110 qemu_opt_set(opts, "index", buf); 111 } 112 if (file) 113 qemu_opt_set(opts, "file", file); 114 return opts; 115 } 116 117 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 118 { 119 DriveInfo *dinfo; 120 121 /* seek interface, bus and unit */ 122 123 QTAILQ_FOREACH(dinfo, &drives, next) { 124 if (dinfo->type == type && 125 dinfo->bus == bus && 126 dinfo->unit == unit) 127 return dinfo; 128 } 129 130 return NULL; 131 } 132 133 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 134 { 135 return drive_get(type, 136 drive_index_to_bus_id(type, index), 137 drive_index_to_unit_id(type, index)); 138 } 139 140 int drive_get_max_bus(BlockInterfaceType type) 141 { 142 int max_bus; 143 DriveInfo *dinfo; 144 145 max_bus = -1; 146 QTAILQ_FOREACH(dinfo, &drives, next) { 147 if(dinfo->type == type && 148 dinfo->bus > max_bus) 149 max_bus = dinfo->bus; 150 } 151 return max_bus; 152 } 153 154 /* Get a block device. This should only be used for single-drive devices 155 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 156 appropriate bus. */ 157 DriveInfo *drive_get_next(BlockInterfaceType type) 158 { 159 static int next_block_unit[IF_COUNT]; 160 161 return drive_get(type, 0, next_block_unit[type]++); 162 } 163 164 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 165 { 166 DriveInfo *dinfo; 167 168 QTAILQ_FOREACH(dinfo, &drives, next) { 169 if (dinfo->bdrv == bs) { 170 return dinfo; 171 } 172 } 173 return NULL; 174 } 175 176 static void bdrv_format_print(void *opaque, const char *name) 177 { 178 error_printf(" %s", name); 179 } 180 181 static void drive_uninit(DriveInfo *dinfo) 182 { 183 qemu_opts_del(dinfo->opts); 184 bdrv_delete(dinfo->bdrv); 185 qemu_free(dinfo->id); 186 QTAILQ_REMOVE(&drives, dinfo, next); 187 qemu_free(dinfo); 188 } 189 190 void drive_put_ref(DriveInfo *dinfo) 191 { 192 assert(dinfo->refcount); 193 if (--dinfo->refcount == 0) { 194 drive_uninit(dinfo); 195 } 196 } 197 198 void drive_get_ref(DriveInfo *dinfo) 199 { 200 dinfo->refcount++; 201 } 202 203 static int parse_block_error_action(const char *buf, int is_read) 204 { 205 if (!strcmp(buf, "ignore")) { 206 return BLOCK_ERR_IGNORE; 207 } else if (!is_read && !strcmp(buf, "enospc")) { 208 return BLOCK_ERR_STOP_ENOSPC; 209 } else if (!strcmp(buf, "stop")) { 210 return BLOCK_ERR_STOP_ANY; 211 } else if (!strcmp(buf, "report")) { 212 return BLOCK_ERR_REPORT; 213 } else { 214 error_report("'%s' invalid %s error action", 215 buf, is_read ? "read" : "write"); 216 return -1; 217 } 218 } 219 220 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) 221 { 222 const char *buf; 223 const char *file = NULL; 224 char devname[128]; 225 const char *serial; 226 const char *mediastr = ""; 227 BlockInterfaceType type; 228 enum { MEDIA_DISK, MEDIA_CDROM } media; 229 int bus_id, unit_id; 230 int cyls, heads, secs, translation; 231 BlockDriver *drv = NULL; 232 int max_devs; 233 int index; 234 int ro = 0; 235 int bdrv_flags = 0; 236 int on_read_error, on_write_error; 237 const char *devaddr; 238 DriveInfo *dinfo; 239 int snapshot = 0; 240 int ret; 241 242 translation = BIOS_ATA_TRANSLATION_AUTO; 243 244 if (default_to_scsi) { 245 type = IF_SCSI; 246 pstrcpy(devname, sizeof(devname), "scsi"); 247 } else { 248 type = IF_IDE; 249 pstrcpy(devname, sizeof(devname), "ide"); 250 } 251 media = MEDIA_DISK; 252 253 /* extract parameters */ 254 bus_id = qemu_opt_get_number(opts, "bus", 0); 255 unit_id = qemu_opt_get_number(opts, "unit", -1); 256 index = qemu_opt_get_number(opts, "index", -1); 257 258 cyls = qemu_opt_get_number(opts, "cyls", 0); 259 heads = qemu_opt_get_number(opts, "heads", 0); 260 secs = qemu_opt_get_number(opts, "secs", 0); 261 262 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 263 ro = qemu_opt_get_bool(opts, "readonly", 0); 264 265 file = qemu_opt_get(opts, "file"); 266 serial = qemu_opt_get(opts, "serial"); 267 268 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 269 pstrcpy(devname, sizeof(devname), buf); 270 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 271 ; 272 if (type == IF_COUNT) { 273 error_report("unsupported bus type '%s'", buf); 274 return NULL; 275 } 276 } 277 max_devs = if_max_devs[type]; 278 279 if (cyls || heads || secs) { 280 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { 281 error_report("invalid physical cyls number"); 282 return NULL; 283 } 284 if (heads < 1 || (type == IF_IDE && heads > 16)) { 285 error_report("invalid physical heads number"); 286 return NULL; 287 } 288 if (secs < 1 || (type == IF_IDE && secs > 63)) { 289 error_report("invalid physical secs number"); 290 return NULL; 291 } 292 } 293 294 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 295 if (!cyls) { 296 error_report("'%s' trans must be used with cyls, heads and secs", 297 buf); 298 return NULL; 299 } 300 if (!strcmp(buf, "none")) 301 translation = BIOS_ATA_TRANSLATION_NONE; 302 else if (!strcmp(buf, "lba")) 303 translation = BIOS_ATA_TRANSLATION_LBA; 304 else if (!strcmp(buf, "auto")) 305 translation = BIOS_ATA_TRANSLATION_AUTO; 306 else { 307 error_report("'%s' invalid translation type", buf); 308 return NULL; 309 } 310 } 311 312 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 313 if (!strcmp(buf, "disk")) { 314 media = MEDIA_DISK; 315 } else if (!strcmp(buf, "cdrom")) { 316 if (cyls || secs || heads) { 317 error_report("'%s' invalid physical CHS format", buf); 318 return NULL; 319 } 320 media = MEDIA_CDROM; 321 } else { 322 error_report("'%s' invalid media", buf); 323 return NULL; 324 } 325 } 326 327 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 328 if (!strcmp(buf, "off") || !strcmp(buf, "none")) { 329 bdrv_flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 330 } else if (!strcmp(buf, "writeback")) { 331 bdrv_flags |= BDRV_O_CACHE_WB; 332 } else if (!strcmp(buf, "unsafe")) { 333 bdrv_flags |= BDRV_O_CACHE_WB; 334 bdrv_flags |= BDRV_O_NO_FLUSH; 335 } else if (!strcmp(buf, "writethrough")) { 336 /* this is the default */ 337 } else { 338 error_report("invalid cache option"); 339 return NULL; 340 } 341 } 342 343 #ifdef CONFIG_LINUX_AIO 344 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 345 if (!strcmp(buf, "native")) { 346 bdrv_flags |= BDRV_O_NATIVE_AIO; 347 } else if (!strcmp(buf, "threads")) { 348 /* this is the default */ 349 } else { 350 error_report("invalid aio option"); 351 return NULL; 352 } 353 } 354 #endif 355 356 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 357 if (strcmp(buf, "?") == 0) { 358 error_printf("Supported formats:"); 359 bdrv_iterate_format(bdrv_format_print, NULL); 360 error_printf("\n"); 361 return NULL; 362 } 363 drv = bdrv_find_whitelisted_format(buf); 364 if (!drv) { 365 error_report("'%s' invalid format", buf); 366 return NULL; 367 } 368 } 369 370 on_write_error = BLOCK_ERR_STOP_ENOSPC; 371 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 372 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 373 error_report("werror is not supported by this bus type"); 374 return NULL; 375 } 376 377 on_write_error = parse_block_error_action(buf, 0); 378 if (on_write_error < 0) { 379 return NULL; 380 } 381 } 382 383 on_read_error = BLOCK_ERR_REPORT; 384 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 385 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 386 error_report("rerror is not supported by this bus type"); 387 return NULL; 388 } 389 390 on_read_error = parse_block_error_action(buf, 1); 391 if (on_read_error < 0) { 392 return NULL; 393 } 394 } 395 396 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 397 if (type != IF_VIRTIO) { 398 error_report("addr is not supported by this bus type"); 399 return NULL; 400 } 401 } 402 403 /* compute bus and unit according index */ 404 405 if (index != -1) { 406 if (bus_id != 0 || unit_id != -1) { 407 error_report("index cannot be used with bus and unit"); 408 return NULL; 409 } 410 bus_id = drive_index_to_bus_id(type, index); 411 unit_id = drive_index_to_unit_id(type, index); 412 } 413 414 /* if user doesn't specify a unit_id, 415 * try to find the first free 416 */ 417 418 if (unit_id == -1) { 419 unit_id = 0; 420 while (drive_get(type, bus_id, unit_id) != NULL) { 421 unit_id++; 422 if (max_devs && unit_id >= max_devs) { 423 unit_id -= max_devs; 424 bus_id++; 425 } 426 } 427 } 428 429 /* check unit id */ 430 431 if (max_devs && unit_id >= max_devs) { 432 error_report("unit %d too big (max is %d)", 433 unit_id, max_devs - 1); 434 return NULL; 435 } 436 437 /* 438 * catch multiple definitions 439 */ 440 441 if (drive_get(type, bus_id, unit_id) != NULL) { 442 error_report("drive with bus=%d, unit=%d (index=%d) exists", 443 bus_id, unit_id, index); 444 return NULL; 445 } 446 447 /* init */ 448 449 dinfo = qemu_mallocz(sizeof(*dinfo)); 450 if ((buf = qemu_opts_id(opts)) != NULL) { 451 dinfo->id = qemu_strdup(buf); 452 } else { 453 /* no id supplied -> create one */ 454 dinfo->id = qemu_mallocz(32); 455 if (type == IF_IDE || type == IF_SCSI) 456 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 457 if (max_devs) 458 snprintf(dinfo->id, 32, "%s%i%s%i", 459 devname, bus_id, mediastr, unit_id); 460 else 461 snprintf(dinfo->id, 32, "%s%s%i", 462 devname, mediastr, unit_id); 463 } 464 dinfo->bdrv = bdrv_new(dinfo->id); 465 dinfo->devaddr = devaddr; 466 dinfo->type = type; 467 dinfo->bus = bus_id; 468 dinfo->unit = unit_id; 469 dinfo->opts = opts; 470 dinfo->refcount = 1; 471 if (serial) 472 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); 473 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 474 475 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 476 477 switch(type) { 478 case IF_IDE: 479 case IF_SCSI: 480 case IF_XEN: 481 case IF_NONE: 482 switch(media) { 483 case MEDIA_DISK: 484 if (cyls != 0) { 485 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); 486 bdrv_set_translation_hint(dinfo->bdrv, translation); 487 } 488 break; 489 case MEDIA_CDROM: 490 bdrv_set_removable(dinfo->bdrv, 1); 491 dinfo->media_cd = 1; 492 break; 493 } 494 break; 495 case IF_SD: 496 /* FIXME: This isn't really a floppy, but it's a reasonable 497 approximation. */ 498 case IF_FLOPPY: 499 bdrv_set_removable(dinfo->bdrv, 1); 500 break; 501 case IF_PFLASH: 502 case IF_MTD: 503 break; 504 case IF_VIRTIO: 505 /* add virtio block device */ 506 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 507 qemu_opt_set(opts, "driver", "virtio-blk"); 508 qemu_opt_set(opts, "drive", dinfo->id); 509 if (devaddr) 510 qemu_opt_set(opts, "addr", devaddr); 511 break; 512 default: 513 abort(); 514 } 515 if (!file || !*file) { 516 return dinfo; 517 } 518 if (snapshot) { 519 /* always use cache=unsafe with snapshot */ 520 bdrv_flags &= ~BDRV_O_CACHE_MASK; 521 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 522 } 523 524 if (media == MEDIA_CDROM) { 525 /* CDROM is fine for any interface, don't check. */ 526 ro = 1; 527 } else if (ro == 1) { 528 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { 529 error_report("readonly not supported by this bus type"); 530 goto err; 531 } 532 } 533 534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 535 536 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 537 if (ret < 0) { 538 error_report("could not open disk image %s: %s", 539 file, strerror(-ret)); 540 goto err; 541 } 542 543 if (bdrv_key_required(dinfo->bdrv)) 544 autostart = 0; 545 return dinfo; 546 547 err: 548 bdrv_delete(dinfo->bdrv); 549 qemu_free(dinfo->id); 550 QTAILQ_REMOVE(&drives, dinfo, next); 551 qemu_free(dinfo); 552 return NULL; 553 } 554 555 void do_commit(Monitor *mon, const QDict *qdict) 556 { 557 const char *device = qdict_get_str(qdict, "device"); 558 BlockDriverState *bs; 559 560 if (!strcmp(device, "all")) { 561 bdrv_commit_all(); 562 } else { 563 bs = bdrv_find(device); 564 if (!bs) { 565 qerror_report(QERR_DEVICE_NOT_FOUND, device); 566 return; 567 } 568 bdrv_commit(bs); 569 } 570 } 571 572 int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data) 573 { 574 const char *device = qdict_get_str(qdict, "device"); 575 const char *filename = qdict_get_try_str(qdict, "snapshot_file"); 576 const char *format = qdict_get_try_str(qdict, "format"); 577 BlockDriverState *bs; 578 BlockDriver *drv, *old_drv, *proto_drv; 579 int ret = 0; 580 int flags; 581 char old_filename[1024]; 582 583 if (!filename) { 584 qerror_report(QERR_MISSING_PARAMETER, "snapshot_file"); 585 ret = -1; 586 goto out; 587 } 588 589 bs = bdrv_find(device); 590 if (!bs) { 591 qerror_report(QERR_DEVICE_NOT_FOUND, device); 592 ret = -1; 593 goto out; 594 } 595 596 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 597 598 old_drv = bs->drv; 599 flags = bs->open_flags; 600 601 if (!format) { 602 format = "qcow2"; 603 } 604 605 drv = bdrv_find_format(format); 606 if (!drv) { 607 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 608 ret = -1; 609 goto out; 610 } 611 612 proto_drv = bdrv_find_protocol(filename); 613 if (!proto_drv) { 614 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 615 ret = -1; 616 goto out; 617 } 618 619 ret = bdrv_img_create(filename, format, bs->filename, 620 bs->drv->format_name, NULL, -1, flags); 621 if (ret) { 622 goto out; 623 } 624 625 qemu_aio_flush(); 626 bdrv_flush(bs); 627 628 bdrv_close(bs); 629 ret = bdrv_open(bs, filename, flags, drv); 630 /* 631 * If reopening the image file we just created fails, fall back 632 * and try to re-open the original image. If that fails too, we 633 * are in serious trouble. 634 */ 635 if (ret != 0) { 636 ret = bdrv_open(bs, old_filename, flags, old_drv); 637 if (ret != 0) { 638 qerror_report(QERR_OPEN_FILE_FAILED, old_filename); 639 } else { 640 qerror_report(QERR_OPEN_FILE_FAILED, filename); 641 } 642 } 643 out: 644 if (ret) { 645 ret = -1; 646 } 647 648 return ret; 649 } 650 651 static int eject_device(Monitor *mon, BlockDriverState *bs, int force) 652 { 653 if (!force) { 654 if (!bdrv_is_removable(bs)) { 655 qerror_report(QERR_DEVICE_NOT_REMOVABLE, 656 bdrv_get_device_name(bs)); 657 return -1; 658 } 659 if (bdrv_is_locked(bs)) { 660 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 661 return -1; 662 } 663 } 664 bdrv_close(bs); 665 return 0; 666 } 667 668 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) 669 { 670 BlockDriverState *bs; 671 int force = qdict_get_try_bool(qdict, "force", 0); 672 const char *filename = qdict_get_str(qdict, "device"); 673 674 bs = bdrv_find(filename); 675 if (!bs) { 676 qerror_report(QERR_DEVICE_NOT_FOUND, filename); 677 return -1; 678 } 679 return eject_device(mon, bs, force); 680 } 681 682 int do_block_set_passwd(Monitor *mon, const QDict *qdict, 683 QObject **ret_data) 684 { 685 BlockDriverState *bs; 686 int err; 687 688 bs = bdrv_find(qdict_get_str(qdict, "device")); 689 if (!bs) { 690 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device")); 691 return -1; 692 } 693 694 err = bdrv_set_key(bs, qdict_get_str(qdict, "password")); 695 if (err == -EINVAL) { 696 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 697 return -1; 698 } else if (err < 0) { 699 qerror_report(QERR_INVALID_PASSWORD); 700 return -1; 701 } 702 703 return 0; 704 } 705 706 int do_change_block(Monitor *mon, const char *device, 707 const char *filename, const char *fmt) 708 { 709 BlockDriverState *bs; 710 BlockDriver *drv = NULL; 711 int bdrv_flags; 712 713 bs = bdrv_find(device); 714 if (!bs) { 715 qerror_report(QERR_DEVICE_NOT_FOUND, device); 716 return -1; 717 } 718 if (fmt) { 719 drv = bdrv_find_whitelisted_format(fmt); 720 if (!drv) { 721 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); 722 return -1; 723 } 724 } 725 if (eject_device(mon, bs, 0) < 0) { 726 return -1; 727 } 728 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 729 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 730 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 731 qerror_report(QERR_OPEN_FILE_FAILED, filename); 732 return -1; 733 } 734 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); 735 } 736 737 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 738 { 739 const char *id = qdict_get_str(qdict, "id"); 740 BlockDriverState *bs; 741 742 bs = bdrv_find(id); 743 if (!bs) { 744 qerror_report(QERR_DEVICE_NOT_FOUND, id); 745 return -1; 746 } 747 if (bdrv_in_use(bs)) { 748 qerror_report(QERR_DEVICE_IN_USE, id); 749 return -1; 750 } 751 752 /* quiesce block driver; prevent further io */ 753 qemu_aio_flush(); 754 bdrv_flush(bs); 755 bdrv_close(bs); 756 757 /* if we have a device associated with this BlockDriverState (bs->peer) 758 * then we need to make the drive anonymous until the device 759 * can be removed. If this is a drive with no device backing 760 * then we can just get rid of the block driver state right here. 761 */ 762 if (bs->peer) { 763 bdrv_make_anon(bs); 764 } else { 765 drive_uninit(drive_get_by_blockdev(bs)); 766 } 767 768 return 0; 769 } 770 771 /* 772 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the 773 * existing QERR_ macro mess is cleaned up. A good example for better 774 * error reports can be found in the qemu-img resize code. 775 */ 776 int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data) 777 { 778 const char *device = qdict_get_str(qdict, "device"); 779 int64_t size = qdict_get_int(qdict, "size"); 780 BlockDriverState *bs; 781 782 bs = bdrv_find(device); 783 if (!bs) { 784 qerror_report(QERR_DEVICE_NOT_FOUND, device); 785 return -1; 786 } 787 788 if (size < 0) { 789 qerror_report(QERR_UNDEFINED_ERROR); 790 return -1; 791 } 792 793 if (bdrv_truncate(bs, size)) { 794 qerror_report(QERR_UNDEFINED_ERROR); 795 return -1; 796 } 797 798 return 0; 799 } 800