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; 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_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM); 491 break; 492 } 493 break; 494 case IF_SD: 495 /* FIXME: This isn't really a floppy, but it's a reasonable 496 approximation. */ 497 case IF_FLOPPY: 498 bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY); 499 break; 500 case IF_PFLASH: 501 case IF_MTD: 502 break; 503 case IF_VIRTIO: 504 /* add virtio block device */ 505 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 506 qemu_opt_set(opts, "driver", "virtio-blk-pci"); 507 qemu_opt_set(opts, "drive", dinfo->id); 508 if (devaddr) 509 qemu_opt_set(opts, "addr", devaddr); 510 break; 511 default: 512 abort(); 513 } 514 if (!file || !*file) { 515 return dinfo; 516 } 517 if (snapshot) { 518 /* always use cache=unsafe with snapshot */ 519 bdrv_flags &= ~BDRV_O_CACHE_MASK; 520 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 521 } 522 523 if (media == MEDIA_CDROM) { 524 /* CDROM is fine for any interface, don't check. */ 525 ro = 1; 526 } else if (ro == 1) { 527 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { 528 error_report("readonly not supported by this bus type"); 529 goto err; 530 } 531 } 532 533 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 534 535 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 536 if (ret < 0) { 537 error_report("could not open disk image %s: %s", 538 file, strerror(-ret)); 539 goto err; 540 } 541 542 if (bdrv_key_required(dinfo->bdrv)) 543 autostart = 0; 544 return dinfo; 545 546 err: 547 bdrv_delete(dinfo->bdrv); 548 qemu_free(dinfo->id); 549 QTAILQ_REMOVE(&drives, dinfo, next); 550 qemu_free(dinfo); 551 return NULL; 552 } 553 554 void do_commit(Monitor *mon, const QDict *qdict) 555 { 556 const char *device = qdict_get_str(qdict, "device"); 557 BlockDriverState *bs; 558 559 if (!strcmp(device, "all")) { 560 bdrv_commit_all(); 561 } else { 562 bs = bdrv_find(device); 563 if (!bs) { 564 qerror_report(QERR_DEVICE_NOT_FOUND, device); 565 return; 566 } 567 bdrv_commit(bs); 568 } 569 } 570 571 int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data) 572 { 573 const char *device = qdict_get_str(qdict, "device"); 574 const char *filename = qdict_get_try_str(qdict, "snapshot_file"); 575 const char *format = qdict_get_try_str(qdict, "format"); 576 BlockDriverState *bs; 577 BlockDriver *drv, *old_drv, *proto_drv; 578 int ret = 0; 579 int flags; 580 char old_filename[1024]; 581 582 if (!filename) { 583 qerror_report(QERR_MISSING_PARAMETER, "snapshot_file"); 584 ret = -1; 585 goto out; 586 } 587 588 bs = bdrv_find(device); 589 if (!bs) { 590 qerror_report(QERR_DEVICE_NOT_FOUND, device); 591 ret = -1; 592 goto out; 593 } 594 595 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 596 597 old_drv = bs->drv; 598 flags = bs->open_flags; 599 600 if (!format) { 601 format = "qcow2"; 602 } 603 604 drv = bdrv_find_format(format); 605 if (!drv) { 606 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 607 ret = -1; 608 goto out; 609 } 610 611 proto_drv = bdrv_find_protocol(filename); 612 if (!proto_drv) { 613 qerror_report(QERR_INVALID_BLOCK_FORMAT, format); 614 ret = -1; 615 goto out; 616 } 617 618 ret = bdrv_img_create(filename, format, bs->filename, 619 bs->drv->format_name, NULL, -1, flags); 620 if (ret) { 621 goto out; 622 } 623 624 qemu_aio_flush(); 625 bdrv_flush(bs); 626 627 bdrv_close(bs); 628 ret = bdrv_open(bs, filename, flags, drv); 629 /* 630 * If reopening the image file we just created fails, fall back 631 * and try to re-open the original image. If that fails too, we 632 * are in serious trouble. 633 */ 634 if (ret != 0) { 635 ret = bdrv_open(bs, old_filename, flags, old_drv); 636 if (ret != 0) { 637 qerror_report(QERR_OPEN_FILE_FAILED, old_filename); 638 } else { 639 qerror_report(QERR_OPEN_FILE_FAILED, filename); 640 } 641 } 642 out: 643 if (ret) { 644 ret = -1; 645 } 646 647 return ret; 648 } 649 650 static int eject_device(Monitor *mon, BlockDriverState *bs, int force) 651 { 652 if (!force) { 653 if (!bdrv_is_removable(bs)) { 654 qerror_report(QERR_DEVICE_NOT_REMOVABLE, 655 bdrv_get_device_name(bs)); 656 return -1; 657 } 658 if (bdrv_is_locked(bs)) { 659 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 660 return -1; 661 } 662 } 663 bdrv_close(bs); 664 return 0; 665 } 666 667 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) 668 { 669 BlockDriverState *bs; 670 int force = qdict_get_try_bool(qdict, "force", 0); 671 const char *filename = qdict_get_str(qdict, "device"); 672 673 bs = bdrv_find(filename); 674 if (!bs) { 675 qerror_report(QERR_DEVICE_NOT_FOUND, filename); 676 return -1; 677 } 678 return eject_device(mon, bs, force); 679 } 680 681 int do_block_set_passwd(Monitor *mon, const QDict *qdict, 682 QObject **ret_data) 683 { 684 BlockDriverState *bs; 685 int err; 686 687 bs = bdrv_find(qdict_get_str(qdict, "device")); 688 if (!bs) { 689 qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device")); 690 return -1; 691 } 692 693 err = bdrv_set_key(bs, qdict_get_str(qdict, "password")); 694 if (err == -EINVAL) { 695 qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 696 return -1; 697 } else if (err < 0) { 698 qerror_report(QERR_INVALID_PASSWORD); 699 return -1; 700 } 701 702 return 0; 703 } 704 705 int do_change_block(Monitor *mon, const char *device, 706 const char *filename, const char *fmt) 707 { 708 BlockDriverState *bs; 709 BlockDriver *drv = NULL; 710 int bdrv_flags; 711 712 bs = bdrv_find(device); 713 if (!bs) { 714 qerror_report(QERR_DEVICE_NOT_FOUND, device); 715 return -1; 716 } 717 if (fmt) { 718 drv = bdrv_find_whitelisted_format(fmt); 719 if (!drv) { 720 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); 721 return -1; 722 } 723 } 724 if (eject_device(mon, bs, 0) < 0) { 725 return -1; 726 } 727 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 728 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 729 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 730 qerror_report(QERR_OPEN_FILE_FAILED, filename); 731 return -1; 732 } 733 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); 734 } 735 736 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 737 { 738 const char *id = qdict_get_str(qdict, "id"); 739 BlockDriverState *bs; 740 BlockDriverState **ptr; 741 Property *prop; 742 743 bs = bdrv_find(id); 744 if (!bs) { 745 qerror_report(QERR_DEVICE_NOT_FOUND, id); 746 return -1; 747 } 748 if (bdrv_in_use(bs)) { 749 qerror_report(QERR_DEVICE_IN_USE, id); 750 return -1; 751 } 752 753 /* quiesce block driver; prevent further io */ 754 qemu_aio_flush(); 755 bdrv_flush(bs); 756 bdrv_close(bs); 757 758 /* clean up guest state from pointing to host resource by 759 * finding and removing DeviceState "drive" property */ 760 if (bs->peer) { 761 for (prop = bs->peer->info->props; prop && prop->name; prop++) { 762 if (prop->info->type == PROP_TYPE_DRIVE) { 763 ptr = qdev_get_prop_ptr(bs->peer, prop); 764 if (*ptr == bs) { 765 bdrv_detach(bs, bs->peer); 766 *ptr = NULL; 767 break; 768 } 769 } 770 } 771 } 772 773 /* clean up host side */ 774 drive_uninit(drive_get_by_blockdev(bs)); 775 776 return 0; 777 } 778 779 /* 780 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the 781 * existing QERR_ macro mess is cleaned up. A good example for better 782 * error reports can be found in the qemu-img resize code. 783 */ 784 int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data) 785 { 786 const char *device = qdict_get_str(qdict, "device"); 787 int64_t size = qdict_get_int(qdict, "size"); 788 BlockDriverState *bs; 789 790 bs = bdrv_find(device); 791 if (!bs) { 792 qerror_report(QERR_DEVICE_NOT_FOUND, device); 793 return -1; 794 } 795 796 if (size < 0) { 797 qerror_report(QERR_UNDEFINED_ERROR); 798 return -1; 799 } 800 801 if (bdrv_truncate(bs, size)) { 802 qerror_report(QERR_UNDEFINED_ERROR); 803 return -1; 804 } 805 806 return 0; 807 } 808