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 "block_int.h" 18 19 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 20 21 static const char *const if_name[IF_COUNT] = { 22 [IF_NONE] = "none", 23 [IF_IDE] = "ide", 24 [IF_SCSI] = "scsi", 25 [IF_FLOPPY] = "floppy", 26 [IF_PFLASH] = "pflash", 27 [IF_MTD] = "mtd", 28 [IF_SD] = "sd", 29 [IF_VIRTIO] = "virtio", 30 [IF_XEN] = "xen", 31 }; 32 33 static const int if_max_devs[IF_COUNT] = { 34 /* 35 * Do not change these numbers! They govern how drive option 36 * index maps to unit and bus. That mapping is ABI. 37 * 38 * All controllers used to imlement if=T drives need to support 39 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 40 * Otherwise, some index values map to "impossible" bus, unit 41 * values. 42 * 43 * For instance, if you change [IF_SCSI] to 255, -drive 44 * if=scsi,index=12 no longer means bus=1,unit=5, but 45 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 46 * the drive can't be set up. Regression. 47 */ 48 [IF_IDE] = 2, 49 [IF_SCSI] = 7, 50 }; 51 52 /* 53 * We automatically delete the drive when a device using it gets 54 * unplugged. Questionable feature, but we can't just drop it. 55 * Device models call blockdev_mark_auto_del() to schedule the 56 * automatic deletion, and generic qdev code calls blockdev_auto_del() 57 * when deletion is actually safe. 58 */ 59 void blockdev_mark_auto_del(BlockDriverState *bs) 60 { 61 DriveInfo *dinfo = drive_get_by_blockdev(bs); 62 63 if (dinfo) { 64 dinfo->auto_del = 1; 65 } 66 } 67 68 void blockdev_auto_del(BlockDriverState *bs) 69 { 70 DriveInfo *dinfo = drive_get_by_blockdev(bs); 71 72 if (dinfo && dinfo->auto_del) { 73 drive_put_ref(dinfo); 74 } 75 } 76 77 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 78 { 79 int max_devs = if_max_devs[type]; 80 return max_devs ? index / max_devs : 0; 81 } 82 83 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 84 { 85 int max_devs = if_max_devs[type]; 86 return max_devs ? index % max_devs : index; 87 } 88 89 QemuOpts *drive_def(const char *optstr) 90 { 91 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 92 } 93 94 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 95 const char *optstr) 96 { 97 QemuOpts *opts; 98 char buf[32]; 99 100 opts = drive_def(optstr); 101 if (!opts) { 102 return NULL; 103 } 104 if (type != IF_DEFAULT) { 105 qemu_opt_set(opts, "if", if_name[type]); 106 } 107 if (index >= 0) { 108 snprintf(buf, sizeof(buf), "%d", index); 109 qemu_opt_set(opts, "index", buf); 110 } 111 if (file) 112 qemu_opt_set(opts, "file", file); 113 return opts; 114 } 115 116 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 117 { 118 DriveInfo *dinfo; 119 120 /* seek interface, bus and unit */ 121 122 QTAILQ_FOREACH(dinfo, &drives, next) { 123 if (dinfo->type == type && 124 dinfo->bus == bus && 125 dinfo->unit == unit) 126 return dinfo; 127 } 128 129 return NULL; 130 } 131 132 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 133 { 134 return drive_get(type, 135 drive_index_to_bus_id(type, index), 136 drive_index_to_unit_id(type, index)); 137 } 138 139 int drive_get_max_bus(BlockInterfaceType type) 140 { 141 int max_bus; 142 DriveInfo *dinfo; 143 144 max_bus = -1; 145 QTAILQ_FOREACH(dinfo, &drives, next) { 146 if(dinfo->type == type && 147 dinfo->bus > max_bus) 148 max_bus = dinfo->bus; 149 } 150 return max_bus; 151 } 152 153 /* Get a block device. This should only be used for single-drive devices 154 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 155 appropriate bus. */ 156 DriveInfo *drive_get_next(BlockInterfaceType type) 157 { 158 static int next_block_unit[IF_COUNT]; 159 160 return drive_get(type, 0, next_block_unit[type]++); 161 } 162 163 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 164 { 165 DriveInfo *dinfo; 166 167 QTAILQ_FOREACH(dinfo, &drives, next) { 168 if (dinfo->bdrv == bs) { 169 return dinfo; 170 } 171 } 172 return NULL; 173 } 174 175 static void bdrv_format_print(void *opaque, const char *name) 176 { 177 error_printf(" %s", name); 178 } 179 180 static void drive_uninit(DriveInfo *dinfo) 181 { 182 qemu_opts_del(dinfo->opts); 183 bdrv_delete(dinfo->bdrv); 184 g_free(dinfo->id); 185 QTAILQ_REMOVE(&drives, dinfo, next); 186 g_free(dinfo); 187 } 188 189 void drive_put_ref(DriveInfo *dinfo) 190 { 191 assert(dinfo->refcount); 192 if (--dinfo->refcount == 0) { 193 drive_uninit(dinfo); 194 } 195 } 196 197 void drive_get_ref(DriveInfo *dinfo) 198 { 199 dinfo->refcount++; 200 } 201 202 static int parse_block_error_action(const char *buf, int is_read) 203 { 204 if (!strcmp(buf, "ignore")) { 205 return BLOCK_ERR_IGNORE; 206 } else if (!is_read && !strcmp(buf, "enospc")) { 207 return BLOCK_ERR_STOP_ENOSPC; 208 } else if (!strcmp(buf, "stop")) { 209 return BLOCK_ERR_STOP_ANY; 210 } else if (!strcmp(buf, "report")) { 211 return BLOCK_ERR_REPORT; 212 } else { 213 error_report("'%s' invalid %s error action", 214 buf, is_read ? "read" : "write"); 215 return -1; 216 } 217 } 218 219 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) 220 { 221 const char *buf; 222 const char *file = NULL; 223 char devname[128]; 224 const char *serial; 225 const char *mediastr = ""; 226 BlockInterfaceType type; 227 enum { MEDIA_DISK, MEDIA_CDROM } media; 228 int bus_id, unit_id; 229 int cyls, heads, secs, translation; 230 BlockDriver *drv = NULL; 231 int max_devs; 232 int index; 233 int ro = 0; 234 int bdrv_flags = 0; 235 int on_read_error, on_write_error; 236 const char *devaddr; 237 DriveInfo *dinfo; 238 int snapshot = 0; 239 int ret; 240 241 translation = BIOS_ATA_TRANSLATION_AUTO; 242 media = MEDIA_DISK; 243 244 /* extract parameters */ 245 bus_id = qemu_opt_get_number(opts, "bus", 0); 246 unit_id = qemu_opt_get_number(opts, "unit", -1); 247 index = qemu_opt_get_number(opts, "index", -1); 248 249 cyls = qemu_opt_get_number(opts, "cyls", 0); 250 heads = qemu_opt_get_number(opts, "heads", 0); 251 secs = qemu_opt_get_number(opts, "secs", 0); 252 253 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 254 ro = qemu_opt_get_bool(opts, "readonly", 0); 255 256 file = qemu_opt_get(opts, "file"); 257 serial = qemu_opt_get(opts, "serial"); 258 259 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 260 pstrcpy(devname, sizeof(devname), buf); 261 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 262 ; 263 if (type == IF_COUNT) { 264 error_report("unsupported bus type '%s'", buf); 265 return NULL; 266 } 267 } else { 268 type = default_to_scsi ? IF_SCSI : IF_IDE; 269 pstrcpy(devname, sizeof(devname), if_name[type]); 270 } 271 272 max_devs = if_max_devs[type]; 273 274 if (cyls || heads || secs) { 275 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { 276 error_report("invalid physical cyls number"); 277 return NULL; 278 } 279 if (heads < 1 || (type == IF_IDE && heads > 16)) { 280 error_report("invalid physical heads number"); 281 return NULL; 282 } 283 if (secs < 1 || (type == IF_IDE && secs > 63)) { 284 error_report("invalid physical secs number"); 285 return NULL; 286 } 287 } 288 289 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 290 if (!cyls) { 291 error_report("'%s' trans must be used with cyls, heads and secs", 292 buf); 293 return NULL; 294 } 295 if (!strcmp(buf, "none")) 296 translation = BIOS_ATA_TRANSLATION_NONE; 297 else if (!strcmp(buf, "lba")) 298 translation = BIOS_ATA_TRANSLATION_LBA; 299 else if (!strcmp(buf, "auto")) 300 translation = BIOS_ATA_TRANSLATION_AUTO; 301 else { 302 error_report("'%s' invalid translation type", buf); 303 return NULL; 304 } 305 } 306 307 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 308 if (!strcmp(buf, "disk")) { 309 media = MEDIA_DISK; 310 } else if (!strcmp(buf, "cdrom")) { 311 if (cyls || secs || heads) { 312 error_report("CHS can't be set with media=%s", buf); 313 return NULL; 314 } 315 media = MEDIA_CDROM; 316 } else { 317 error_report("'%s' invalid media", buf); 318 return NULL; 319 } 320 } 321 322 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 323 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { 324 error_report("invalid cache option"); 325 return NULL; 326 } 327 } 328 329 #ifdef CONFIG_LINUX_AIO 330 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 331 if (!strcmp(buf, "native")) { 332 bdrv_flags |= BDRV_O_NATIVE_AIO; 333 } else if (!strcmp(buf, "threads")) { 334 /* this is the default */ 335 } else { 336 error_report("invalid aio option"); 337 return NULL; 338 } 339 } 340 #endif 341 342 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 343 if (strcmp(buf, "?") == 0) { 344 error_printf("Supported formats:"); 345 bdrv_iterate_format(bdrv_format_print, NULL); 346 error_printf("\n"); 347 return NULL; 348 } 349 drv = bdrv_find_whitelisted_format(buf); 350 if (!drv) { 351 error_report("'%s' invalid format", buf); 352 return NULL; 353 } 354 } 355 356 on_write_error = BLOCK_ERR_STOP_ENOSPC; 357 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 358 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 359 error_report("werror is not supported by this bus type"); 360 return NULL; 361 } 362 363 on_write_error = parse_block_error_action(buf, 0); 364 if (on_write_error < 0) { 365 return NULL; 366 } 367 } 368 369 on_read_error = BLOCK_ERR_REPORT; 370 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 371 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 372 error_report("rerror is not supported by this bus type"); 373 return NULL; 374 } 375 376 on_read_error = parse_block_error_action(buf, 1); 377 if (on_read_error < 0) { 378 return NULL; 379 } 380 } 381 382 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 383 if (type != IF_VIRTIO) { 384 error_report("addr is not supported by this bus type"); 385 return NULL; 386 } 387 } 388 389 /* compute bus and unit according index */ 390 391 if (index != -1) { 392 if (bus_id != 0 || unit_id != -1) { 393 error_report("index cannot be used with bus and unit"); 394 return NULL; 395 } 396 bus_id = drive_index_to_bus_id(type, index); 397 unit_id = drive_index_to_unit_id(type, index); 398 } 399 400 /* if user doesn't specify a unit_id, 401 * try to find the first free 402 */ 403 404 if (unit_id == -1) { 405 unit_id = 0; 406 while (drive_get(type, bus_id, unit_id) != NULL) { 407 unit_id++; 408 if (max_devs && unit_id >= max_devs) { 409 unit_id -= max_devs; 410 bus_id++; 411 } 412 } 413 } 414 415 /* check unit id */ 416 417 if (max_devs && unit_id >= max_devs) { 418 error_report("unit %d too big (max is %d)", 419 unit_id, max_devs - 1); 420 return NULL; 421 } 422 423 /* 424 * catch multiple definitions 425 */ 426 427 if (drive_get(type, bus_id, unit_id) != NULL) { 428 error_report("drive with bus=%d, unit=%d (index=%d) exists", 429 bus_id, unit_id, index); 430 return NULL; 431 } 432 433 /* init */ 434 435 dinfo = g_malloc0(sizeof(*dinfo)); 436 if ((buf = qemu_opts_id(opts)) != NULL) { 437 dinfo->id = g_strdup(buf); 438 } else { 439 /* no id supplied -> create one */ 440 dinfo->id = g_malloc0(32); 441 if (type == IF_IDE || type == IF_SCSI) 442 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 443 if (max_devs) 444 snprintf(dinfo->id, 32, "%s%i%s%i", 445 devname, bus_id, mediastr, unit_id); 446 else 447 snprintf(dinfo->id, 32, "%s%s%i", 448 devname, mediastr, unit_id); 449 } 450 dinfo->bdrv = bdrv_new(dinfo->id); 451 dinfo->devaddr = devaddr; 452 dinfo->type = type; 453 dinfo->bus = bus_id; 454 dinfo->unit = unit_id; 455 dinfo->opts = opts; 456 dinfo->refcount = 1; 457 if (serial) 458 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); 459 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 460 461 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 462 463 switch(type) { 464 case IF_IDE: 465 case IF_SCSI: 466 case IF_XEN: 467 case IF_NONE: 468 switch(media) { 469 case MEDIA_DISK: 470 if (cyls != 0) { 471 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); 472 bdrv_set_translation_hint(dinfo->bdrv, translation); 473 } 474 break; 475 case MEDIA_CDROM: 476 dinfo->media_cd = 1; 477 break; 478 } 479 break; 480 case IF_SD: 481 case IF_FLOPPY: 482 case IF_PFLASH: 483 case IF_MTD: 484 break; 485 case IF_VIRTIO: 486 /* add virtio block device */ 487 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 488 qemu_opt_set(opts, "driver", "virtio-blk"); 489 qemu_opt_set(opts, "drive", dinfo->id); 490 if (devaddr) 491 qemu_opt_set(opts, "addr", devaddr); 492 break; 493 default: 494 abort(); 495 } 496 if (!file || !*file) { 497 return dinfo; 498 } 499 if (snapshot) { 500 /* always use cache=unsafe with snapshot */ 501 bdrv_flags &= ~BDRV_O_CACHE_MASK; 502 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 503 } 504 505 if (media == MEDIA_CDROM) { 506 /* CDROM is fine for any interface, don't check. */ 507 ro = 1; 508 } else if (ro == 1) { 509 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { 510 error_report("readonly not supported by this bus type"); 511 goto err; 512 } 513 } 514 515 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 516 517 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 518 if (ret < 0) { 519 error_report("could not open disk image %s: %s", 520 file, strerror(-ret)); 521 goto err; 522 } 523 524 if (bdrv_key_required(dinfo->bdrv)) 525 autostart = 0; 526 return dinfo; 527 528 err: 529 bdrv_delete(dinfo->bdrv); 530 g_free(dinfo->id); 531 QTAILQ_REMOVE(&drives, dinfo, next); 532 g_free(dinfo); 533 return NULL; 534 } 535 536 void do_commit(Monitor *mon, const QDict *qdict) 537 { 538 const char *device = qdict_get_str(qdict, "device"); 539 BlockDriverState *bs; 540 541 if (!strcmp(device, "all")) { 542 bdrv_commit_all(); 543 } else { 544 bs = bdrv_find(device); 545 if (!bs) { 546 qerror_report(QERR_DEVICE_NOT_FOUND, device); 547 return; 548 } 549 bdrv_commit(bs); 550 } 551 } 552 553 int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data) 554 { 555 const char *device = qdict_get_str(qdict, "device"); 556 const char *filename = qdict_get_try_str(qdict, "snapshot-file"); 557 const char *format = qdict_get_try_str(qdict, "format"); 558 BlockDriverState *bs; 559 BlockDriver *drv, *old_drv, *proto_drv; 560 int ret = 0; 561 int flags; 562 char old_filename[1024]; 563 564 if (!filename) { 565 qerror_report(QERR_MISSING_PARAMETER, "snapshot-file"); 566 ret = -1; 567 goto out; 568 } 569 570 bs = bdrv_find(device); 571 if (!bs) { 572 qerror_report(QERR_DEVICE_NOT_FOUND, device); 573 ret = -1; 574 goto out; 575 } 576 577 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 578 579 old_drv = bs->drv; 580 flags = bs->open_flags; 581 582 if (!format) { 583 format = "qcow2"; 584 } 585 586 drv = bdrv_find_format(format); 587 if (!drv) { 588 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 589 ret = -1; 590 goto out; 591 } 592 593 proto_drv = bdrv_find_protocol(filename); 594 if (!proto_drv) { 595 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 596 ret = -1; 597 goto out; 598 } 599 600 ret = bdrv_img_create(filename, format, bs->filename, 601 bs->drv->format_name, NULL, -1, flags); 602 if (ret) { 603 goto out; 604 } 605 606 qemu_aio_flush(); 607 bdrv_flush(bs); 608 609 bdrv_close(bs); 610 ret = bdrv_open(bs, filename, flags, drv); 611 /* 612 * If reopening the image file we just created fails, fall back 613 * and try to re-open the original image. If that fails too, we 614 * are in serious trouble. 615 */ 616 if (ret != 0) { 617 ret = bdrv_open(bs, old_filename, flags, old_drv); 618 if (ret != 0) { 619 qerror_report(QERR_OPEN_FILE_FAILED, old_filename); 620 } else { 621 qerror_report(QERR_OPEN_FILE_FAILED, filename); 622 } 623 } 624 out: 625 if (ret) { 626 ret = -1; 627 } 628 629 return ret; 630 } 631 632 static int eject_device(Monitor *mon, BlockDriverState *bs, int force) 633 { 634 if (!bdrv_dev_has_removable_media(bs)) { 635 qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 636 return -1; 637 } 638 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 639 bdrv_dev_eject_request(bs, force); 640 if (!force) { 641 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 642 return -1; 643 } 644 } 645 bdrv_close(bs); 646 return 0; 647 } 648 649 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) 650 { 651 BlockDriverState *bs; 652 int force = qdict_get_try_bool(qdict, "force", 0); 653 const char *filename = qdict_get_str(qdict, "device"); 654 655 bs = bdrv_find(filename); 656 if (!bs) { 657 qerror_report(QERR_DEVICE_NOT_FOUND, filename); 658 return -1; 659 } 660 return eject_device(mon, bs, force); 661 } 662 663 int do_block_set_passwd(Monitor *mon, const QDict *qdict, 664 QObject **ret_data) 665 { 666 BlockDriverState *bs; 667 int err; 668 669 bs = bdrv_find(qdict_get_str(qdict, "device")); 670 if (!bs) { 671 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device")); 672 return -1; 673 } 674 675 err = bdrv_set_key(bs, qdict_get_str(qdict, "password")); 676 if (err == -EINVAL) { 677 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 678 return -1; 679 } else if (err < 0) { 680 qerror_report(QERR_INVALID_PASSWORD); 681 return -1; 682 } 683 684 return 0; 685 } 686 687 int do_change_block(Monitor *mon, const char *device, 688 const char *filename, const char *fmt) 689 { 690 BlockDriverState *bs; 691 BlockDriver *drv = NULL; 692 int bdrv_flags; 693 694 bs = bdrv_find(device); 695 if (!bs) { 696 qerror_report(QERR_DEVICE_NOT_FOUND, device); 697 return -1; 698 } 699 if (fmt) { 700 drv = bdrv_find_whitelisted_format(fmt); 701 if (!drv) { 702 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); 703 return -1; 704 } 705 } 706 if (eject_device(mon, bs, 0) < 0) { 707 return -1; 708 } 709 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 710 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 711 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 712 qerror_report(QERR_OPEN_FILE_FAILED, filename); 713 return -1; 714 } 715 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); 716 } 717 718 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 719 { 720 const char *id = qdict_get_str(qdict, "id"); 721 BlockDriverState *bs; 722 723 bs = bdrv_find(id); 724 if (!bs) { 725 qerror_report(QERR_DEVICE_NOT_FOUND, id); 726 return -1; 727 } 728 if (bdrv_in_use(bs)) { 729 qerror_report(QERR_DEVICE_IN_USE, id); 730 return -1; 731 } 732 733 /* quiesce block driver; prevent further io */ 734 qemu_aio_flush(); 735 bdrv_flush(bs); 736 bdrv_close(bs); 737 738 /* if we have a device attached to this BlockDriverState 739 * then we need to make the drive anonymous until the device 740 * can be removed. If this is a drive with no device backing 741 * then we can just get rid of the block driver state right here. 742 */ 743 if (bdrv_get_attached_dev(bs)) { 744 bdrv_make_anon(bs); 745 } else { 746 drive_uninit(drive_get_by_blockdev(bs)); 747 } 748 749 return 0; 750 } 751 752 /* 753 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the 754 * existing QERR_ macro mess is cleaned up. A good example for better 755 * error reports can be found in the qemu-img resize code. 756 */ 757 int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data) 758 { 759 const char *device = qdict_get_str(qdict, "device"); 760 int64_t size = qdict_get_int(qdict, "size"); 761 BlockDriverState *bs; 762 763 bs = bdrv_find(device); 764 if (!bs) { 765 qerror_report(QERR_DEVICE_NOT_FOUND, device); 766 return -1; 767 } 768 769 if (size < 0) { 770 qerror_report(QERR_UNDEFINED_ERROR); 771 return -1; 772 } 773 774 if (bdrv_truncate(bs, size)) { 775 qerror_report(QERR_UNDEFINED_ERROR); 776 return -1; 777 } 778 779 return 0; 780 } 781