blockdev.c

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