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