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 g_free(dinfo->id); 186 QTAILQ_REMOVE(&drives, dinfo, next); 187 g_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 media = MEDIA_DISK; 244 245 /* extract parameters */ 246 bus_id = qemu_opt_get_number(opts, "bus", 0); 247 unit_id = qemu_opt_get_number(opts, "unit", -1); 248 index = qemu_opt_get_number(opts, "index", -1); 249 250 cyls = qemu_opt_get_number(opts, "cyls", 0); 251 heads = qemu_opt_get_number(opts, "heads", 0); 252 secs = qemu_opt_get_number(opts, "secs", 0); 253 254 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 255 ro = qemu_opt_get_bool(opts, "readonly", 0); 256 257 file = qemu_opt_get(opts, "file"); 258 serial = qemu_opt_get(opts, "serial"); 259 260 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 261 pstrcpy(devname, sizeof(devname), buf); 262 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 263 ; 264 if (type == IF_COUNT) { 265 error_report("unsupported bus type '%s'", buf); 266 return NULL; 267 } 268 } else { 269 type = default_to_scsi ? IF_SCSI : IF_IDE; 270 pstrcpy(devname, sizeof(devname), if_name[type]); 271 } 272 273 max_devs = if_max_devs[type]; 274 275 if (cyls || heads || secs) { 276 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { 277 error_report("invalid physical cyls number"); 278 return NULL; 279 } 280 if (heads < 1 || (type == IF_IDE && heads > 16)) { 281 error_report("invalid physical heads number"); 282 return NULL; 283 } 284 if (secs < 1 || (type == IF_IDE && secs > 63)) { 285 error_report("invalid physical secs number"); 286 return NULL; 287 } 288 } 289 290 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 291 if (!cyls) { 292 error_report("'%s' trans must be used with cyls, heads and secs", 293 buf); 294 return NULL; 295 } 296 if (!strcmp(buf, "none")) 297 translation = BIOS_ATA_TRANSLATION_NONE; 298 else if (!strcmp(buf, "lba")) 299 translation = BIOS_ATA_TRANSLATION_LBA; 300 else if (!strcmp(buf, "auto")) 301 translation = BIOS_ATA_TRANSLATION_AUTO; 302 else { 303 error_report("'%s' invalid translation type", buf); 304 return NULL; 305 } 306 } 307 308 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 309 if (!strcmp(buf, "disk")) { 310 media = MEDIA_DISK; 311 } else if (!strcmp(buf, "cdrom")) { 312 if (cyls || secs || heads) { 313 error_report("CHS can't be set with media=%s", buf); 314 return NULL; 315 } 316 media = MEDIA_CDROM; 317 } else { 318 error_report("'%s' invalid media", buf); 319 return NULL; 320 } 321 } 322 323 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 324 if (!strcmp(buf, "off") || !strcmp(buf, "none")) { 325 bdrv_flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 326 } else if (!strcmp(buf, "writeback")) { 327 bdrv_flags |= BDRV_O_CACHE_WB; 328 } else if (!strcmp(buf, "unsafe")) { 329 bdrv_flags |= BDRV_O_CACHE_WB; 330 bdrv_flags |= BDRV_O_NO_FLUSH; 331 } else if (!strcmp(buf, "writethrough")) { 332 /* this is the default */ 333 } else { 334 error_report("invalid cache option"); 335 return NULL; 336 } 337 } 338 339 #ifdef CONFIG_LINUX_AIO 340 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 341 if (!strcmp(buf, "native")) { 342 bdrv_flags |= BDRV_O_NATIVE_AIO; 343 } else if (!strcmp(buf, "threads")) { 344 /* this is the default */ 345 } else { 346 error_report("invalid aio option"); 347 return NULL; 348 } 349 } 350 #endif 351 352 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 353 if (strcmp(buf, "?") == 0) { 354 error_printf("Supported formats:"); 355 bdrv_iterate_format(bdrv_format_print, NULL); 356 error_printf("\n"); 357 return NULL; 358 } 359 drv = bdrv_find_whitelisted_format(buf); 360 if (!drv) { 361 error_report("'%s' invalid format", buf); 362 return NULL; 363 } 364 } 365 366 on_write_error = BLOCK_ERR_STOP_ENOSPC; 367 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 368 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 369 error_report("werror is not supported by this bus type"); 370 return NULL; 371 } 372 373 on_write_error = parse_block_error_action(buf, 0); 374 if (on_write_error < 0) { 375 return NULL; 376 } 377 } 378 379 on_read_error = BLOCK_ERR_REPORT; 380 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 381 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 382 error_report("rerror is not supported by this bus type"); 383 return NULL; 384 } 385 386 on_read_error = parse_block_error_action(buf, 1); 387 if (on_read_error < 0) { 388 return NULL; 389 } 390 } 391 392 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 393 if (type != IF_VIRTIO) { 394 error_report("addr is not supported by this bus type"); 395 return NULL; 396 } 397 } 398 399 /* compute bus and unit according index */ 400 401 if (index != -1) { 402 if (bus_id != 0 || unit_id != -1) { 403 error_report("index cannot be used with bus and unit"); 404 return NULL; 405 } 406 bus_id = drive_index_to_bus_id(type, index); 407 unit_id = drive_index_to_unit_id(type, index); 408 } 409 410 /* if user doesn't specify a unit_id, 411 * try to find the first free 412 */ 413 414 if (unit_id == -1) { 415 unit_id = 0; 416 while (drive_get(type, bus_id, unit_id) != NULL) { 417 unit_id++; 418 if (max_devs && unit_id >= max_devs) { 419 unit_id -= max_devs; 420 bus_id++; 421 } 422 } 423 } 424 425 /* check unit id */ 426 427 if (max_devs && unit_id >= max_devs) { 428 error_report("unit %d too big (max is %d)", 429 unit_id, max_devs - 1); 430 return NULL; 431 } 432 433 /* 434 * catch multiple definitions 435 */ 436 437 if (drive_get(type, bus_id, unit_id) != NULL) { 438 error_report("drive with bus=%d, unit=%d (index=%d) exists", 439 bus_id, unit_id, index); 440 return NULL; 441 } 442 443 /* init */ 444 445 dinfo = g_malloc0(sizeof(*dinfo)); 446 if ((buf = qemu_opts_id(opts)) != NULL) { 447 dinfo->id = g_strdup(buf); 448 } else { 449 /* no id supplied -> create one */ 450 dinfo->id = g_malloc0(32); 451 if (type == IF_IDE || type == IF_SCSI) 452 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 453 if (max_devs) 454 snprintf(dinfo->id, 32, "%s%i%s%i", 455 devname, bus_id, mediastr, unit_id); 456 else 457 snprintf(dinfo->id, 32, "%s%s%i", 458 devname, mediastr, unit_id); 459 } 460 dinfo->bdrv = bdrv_new(dinfo->id); 461 dinfo->devaddr = devaddr; 462 dinfo->type = type; 463 dinfo->bus = bus_id; 464 dinfo->unit = unit_id; 465 dinfo->opts = opts; 466 dinfo->refcount = 1; 467 if (serial) 468 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); 469 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 470 471 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 472 473 switch(type) { 474 case IF_IDE: 475 case IF_SCSI: 476 case IF_XEN: 477 case IF_NONE: 478 switch(media) { 479 case MEDIA_DISK: 480 if (cyls != 0) { 481 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); 482 bdrv_set_translation_hint(dinfo->bdrv, translation); 483 } 484 break; 485 case MEDIA_CDROM: 486 bdrv_set_removable(dinfo->bdrv, 1); 487 dinfo->media_cd = 1; 488 break; 489 } 490 break; 491 case IF_SD: 492 /* FIXME: This isn't really a floppy, but it's a reasonable 493 approximation. */ 494 case IF_FLOPPY: 495 bdrv_set_removable(dinfo->bdrv, 1); 496 break; 497 case IF_PFLASH: 498 case IF_MTD: 499 break; 500 case IF_VIRTIO: 501 /* add virtio block device */ 502 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 503 qemu_opt_set(opts, "driver", "virtio-blk"); 504 qemu_opt_set(opts, "drive", dinfo->id); 505 if (devaddr) 506 qemu_opt_set(opts, "addr", devaddr); 507 break; 508 default: 509 abort(); 510 } 511 if (!file || !*file) { 512 return dinfo; 513 } 514 if (snapshot) { 515 /* always use cache=unsafe with snapshot */ 516 bdrv_flags &= ~BDRV_O_CACHE_MASK; 517 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 518 } 519 520 if (media == MEDIA_CDROM) { 521 /* CDROM is fine for any interface, don't check. */ 522 ro = 1; 523 } else if (ro == 1) { 524 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { 525 error_report("readonly not supported by this bus type"); 526 goto err; 527 } 528 } 529 530 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 531 532 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 533 if (ret < 0) { 534 error_report("could not open disk image %s: %s", 535 file, strerror(-ret)); 536 goto err; 537 } 538 539 if (bdrv_key_required(dinfo->bdrv)) 540 autostart = 0; 541 return dinfo; 542 543 err: 544 bdrv_delete(dinfo->bdrv); 545 g_free(dinfo->id); 546 QTAILQ_REMOVE(&drives, dinfo, next); 547 g_free(dinfo); 548 return NULL; 549 } 550 551 void do_commit(Monitor *mon, const QDict *qdict) 552 { 553 const char *device = qdict_get_str(qdict, "device"); 554 BlockDriverState *bs; 555 556 if (!strcmp(device, "all")) { 557 bdrv_commit_all(); 558 } else { 559 bs = bdrv_find(device); 560 if (!bs) { 561 qerror_report(QERR_DEVICE_NOT_FOUND, device); 562 return; 563 } 564 bdrv_commit(bs); 565 } 566 } 567 568 int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data) 569 { 570 const char *device = qdict_get_str(qdict, "device"); 571 const char *filename = qdict_get_try_str(qdict, "snapshot-file"); 572 const char *format = qdict_get_try_str(qdict, "format"); 573 BlockDriverState *bs; 574 BlockDriver *drv, *old_drv, *proto_drv; 575 int ret = 0; 576 int flags; 577 char old_filename[1024]; 578 579 if (!filename) { 580 qerror_report(QERR_MISSING_PARAMETER, "snapshot-file"); 581 ret = -1; 582 goto out; 583 } 584 585 bs = bdrv_find(device); 586 if (!bs) { 587 qerror_report(QERR_DEVICE_NOT_FOUND, device); 588 ret = -1; 589 goto out; 590 } 591 592 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 593 594 old_drv = bs->drv; 595 flags = bs->open_flags; 596 597 if (!format) { 598 format = "qcow2"; 599 } 600 601 drv = bdrv_find_format(format); 602 if (!drv) { 603 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 604 ret = -1; 605 goto out; 606 } 607 608 proto_drv = bdrv_find_protocol(filename); 609 if (!proto_drv) { 610 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 611 ret = -1; 612 goto out; 613 } 614 615 ret = bdrv_img_create(filename, format, bs->filename, 616 bs->drv->format_name, NULL, -1, flags); 617 if (ret) { 618 goto out; 619 } 620 621 qemu_aio_flush(); 622 bdrv_flush(bs); 623 624 bdrv_close(bs); 625 ret = bdrv_open(bs, filename, flags, drv); 626 /* 627 * If reopening the image file we just created fails, fall back 628 * and try to re-open the original image. If that fails too, we 629 * are in serious trouble. 630 */ 631 if (ret != 0) { 632 ret = bdrv_open(bs, old_filename, flags, old_drv); 633 if (ret != 0) { 634 qerror_report(QERR_OPEN_FILE_FAILED, old_filename); 635 } else { 636 qerror_report(QERR_OPEN_FILE_FAILED, filename); 637 } 638 } 639 out: 640 if (ret) { 641 ret = -1; 642 } 643 644 return ret; 645 } 646 647 static int eject_device(Monitor *mon, BlockDriverState *bs, int force) 648 { 649 if (!bdrv_is_removable(bs)) { 650 qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 651 return -1; 652 } 653 if (!force && bdrv_is_locked(bs)) { 654 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 655 return -1; 656 } 657 bdrv_close(bs); 658 return 0; 659 } 660 661 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) 662 { 663 BlockDriverState *bs; 664 int force = qdict_get_try_bool(qdict, "force", 0); 665 const char *filename = qdict_get_str(qdict, "device"); 666 667 bs = bdrv_find(filename); 668 if (!bs) { 669 qerror_report(QERR_DEVICE_NOT_FOUND, filename); 670 return -1; 671 } 672 return eject_device(mon, bs, force); 673 } 674 675 int do_block_set_passwd(Monitor *mon, const QDict *qdict, 676 QObject **ret_data) 677 { 678 BlockDriverState *bs; 679 int err; 680 681 bs = bdrv_find(qdict_get_str(qdict, "device")); 682 if (!bs) { 683 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device")); 684 return -1; 685 } 686 687 err = bdrv_set_key(bs, qdict_get_str(qdict, "password")); 688 if (err == -EINVAL) { 689 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 690 return -1; 691 } else if (err < 0) { 692 qerror_report(QERR_INVALID_PASSWORD); 693 return -1; 694 } 695 696 return 0; 697 } 698 699 int do_change_block(Monitor *mon, const char *device, 700 const char *filename, const char *fmt) 701 { 702 BlockDriverState *bs; 703 BlockDriver *drv = NULL; 704 int bdrv_flags; 705 706 bs = bdrv_find(device); 707 if (!bs) { 708 qerror_report(QERR_DEVICE_NOT_FOUND, device); 709 return -1; 710 } 711 if (fmt) { 712 drv = bdrv_find_whitelisted_format(fmt); 713 if (!drv) { 714 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); 715 return -1; 716 } 717 } 718 if (eject_device(mon, bs, 0) < 0) { 719 return -1; 720 } 721 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 722 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 723 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 724 qerror_report(QERR_OPEN_FILE_FAILED, filename); 725 return -1; 726 } 727 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); 728 } 729 730 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 731 { 732 const char *id = qdict_get_str(qdict, "id"); 733 BlockDriverState *bs; 734 735 bs = bdrv_find(id); 736 if (!bs) { 737 qerror_report(QERR_DEVICE_NOT_FOUND, id); 738 return -1; 739 } 740 if (bdrv_in_use(bs)) { 741 qerror_report(QERR_DEVICE_IN_USE, id); 742 return -1; 743 } 744 745 /* quiesce block driver; prevent further io */ 746 qemu_aio_flush(); 747 bdrv_flush(bs); 748 bdrv_close(bs); 749 750 /* if we have a device associated with this BlockDriverState (bs->peer) 751 * then we need to make the drive anonymous until the device 752 * can be removed. If this is a drive with no device backing 753 * then we can just get rid of the block driver state right here. 754 */ 755 if (bs->peer) { 756 bdrv_make_anon(bs); 757 } else { 758 drive_uninit(drive_get_by_blockdev(bs)); 759 } 760 761 return 0; 762 } 763 764 /* 765 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the 766 * existing QERR_ macro mess is cleaned up. A good example for better 767 * error reports can be found in the qemu-img resize code. 768 */ 769 int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data) 770 { 771 const char *device = qdict_get_str(qdict, "device"); 772 int64_t size = qdict_get_int(qdict, "size"); 773 BlockDriverState *bs; 774 775 bs = bdrv_find(device); 776 if (!bs) { 777 qerror_report(QERR_DEVICE_NOT_FOUND, device); 778 return -1; 779 } 780 781 if (size < 0) { 782 qerror_report(QERR_UNDEFINED_ERROR); 783 return -1; 784 } 785 786 if (bdrv_truncate(bs, size)) { 787 qerror_report(QERR_UNDEFINED_ERROR); 788 return -1; 789 } 790 791 return 0; 792 } 793