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 "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 static bool do_check_io_limits(BlockIOLimit *io_limits)
 220 {
 221     bool bps_flag;
 222     bool iops_flag;
 223
 224     assert(io_limits);
 225
 226     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 227                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 228                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 229     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 230                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 231                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 232     if (bps_flag || iops_flag) {
 233         return false;
 234     }
 235
 236     return true;
 237 }
 238
 239 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
 240 {
 241     const char *buf;
 242     const char *file = NULL;
 243     char devname[128];
 244     const char *serial;
 245     const char *mediastr = "";
 246     BlockInterfaceType type;
 247     enum { MEDIA_DISK, MEDIA_CDROM } media;
 248     int bus_id, unit_id;
 249     int cyls, heads, secs, translation;
 250     BlockDriver *drv = NULL;
 251     int max_devs;
 252     int index;
 253     int ro = 0;
 254     int bdrv_flags = 0;
 255     int on_read_error, on_write_error;
 256     const char *devaddr;
 257     DriveInfo *dinfo;
 258     BlockIOLimit io_limits;
 259     int snapshot = 0;
 260     int ret;
 261
 262     translation = BIOS_ATA_TRANSLATION_AUTO;
 263     media = MEDIA_DISK;
 264
 265     /* extract parameters */
 266     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 267     unit_id = qemu_opt_get_number(opts, "unit", -1);
 268     index   = qemu_opt_get_number(opts, "index", -1);
 269
 270     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 271     heads = qemu_opt_get_number(opts, "heads", 0);
 272     secs  = qemu_opt_get_number(opts, "secs", 0);
 273
 274     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 275     ro = qemu_opt_get_bool(opts, "readonly", 0);
 276
 277     file = qemu_opt_get(opts, "file");
 278     serial = qemu_opt_get(opts, "serial");
 279
 280     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 281         pstrcpy(devname, sizeof(devname), buf);
 282         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 283             ;
 284         if (type == IF_COUNT) {
 285             error_report("unsupported bus type '%s'", buf);
 286             return NULL;
 287         }
 288     } else {
 289         type = default_to_scsi ? IF_SCSI : IF_IDE;
 290         pstrcpy(devname, sizeof(devname), if_name[type]);
 291     }
 292
 293     max_devs = if_max_devs[type];
 294
 295     if (cyls || heads || secs) {
 296         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
 297             error_report("invalid physical cyls number");
 298             return NULL;
 299         }
 300         if (heads < 1 || (type == IF_IDE && heads > 16)) {
 301             error_report("invalid physical heads number");
 302             return NULL;
 303         }
 304         if (secs < 1 || (type == IF_IDE && secs > 63)) {
 305             error_report("invalid physical secs number");
 306             return NULL;
 307         }
 308     }
 309
 310     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 311         if (!cyls) {
 312             error_report("'%s' trans must be used with cyls, heads and secs",
 313                          buf);
 314             return NULL;
 315         }
 316         if (!strcmp(buf, "none"))
 317             translation = BIOS_ATA_TRANSLATION_NONE;
 318         else if (!strcmp(buf, "lba"))
 319             translation = BIOS_ATA_TRANSLATION_LBA;
 320         else if (!strcmp(buf, "auto"))
 321             translation = BIOS_ATA_TRANSLATION_AUTO;
 322         else {
 323             error_report("'%s' invalid translation type", buf);
 324             return NULL;
 325         }
 326     }
 327
 328     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 329         if (!strcmp(buf, "disk")) {
 330             media = MEDIA_DISK;
 331         } else if (!strcmp(buf, "cdrom")) {
 332             if (cyls || secs || heads) {
 333                 error_report("CHS can't be set with media=%s", buf);
 334                 return NULL;
 335             }
 336             media = MEDIA_CDROM;
 337         } else {
 338             error_report("'%s' invalid media", buf);
 339             return NULL;
 340         }
 341     }
 342
 343     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 344         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 345             error_report("invalid cache option");
 346             return NULL;
 347         }
 348     }
 349
 350 #ifdef CONFIG_LINUX_AIO
 351     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 352         if (!strcmp(buf, "native")) {
 353             bdrv_flags |= BDRV_O_NATIVE_AIO;
 354         } else if (!strcmp(buf, "threads")) {
 355             /* this is the default */
 356         } else {
 357            error_report("invalid aio option");
 358            return NULL;
 359         }
 360     }
 361 #endif
 362
 363     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 364        if (strcmp(buf, "?") == 0) {
 365            error_printf("Supported formats:");
 366            bdrv_iterate_format(bdrv_format_print, NULL);
 367            error_printf("\n");
 368            return NULL;
 369         }
 370         drv = bdrv_find_whitelisted_format(buf);
 371         if (!drv) {
 372             error_report("'%s' invalid format", buf);
 373             return NULL;
 374         }
 375     }
 376
 377     /* disk I/O throttling */
 378     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 379                            qemu_opt_get_number(opts, "bps", 0);
 380     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 381                            qemu_opt_get_number(opts, "bps_rd", 0);
 382     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 383                            qemu_opt_get_number(opts, "bps_wr", 0);
 384     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 385                            qemu_opt_get_number(opts, "iops", 0);
 386     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 387                            qemu_opt_get_number(opts, "iops_rd", 0);
 388     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 389                            qemu_opt_get_number(opts, "iops_wr", 0);
 390
 391     if (!do_check_io_limits(&io_limits)) {
 392         error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 393                      "cannot be used at the same time");
 394         return NULL;
 395     }
 396
 397     on_write_error = BLOCK_ERR_STOP_ENOSPC;
 398     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 399         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 400             error_report("werror is not supported by this bus type");
 401             return NULL;
 402         }
 403
 404         on_write_error = parse_block_error_action(buf, 0);
 405         if (on_write_error < 0) {
 406             return NULL;
 407         }
 408     }
 409
 410     on_read_error = BLOCK_ERR_REPORT;
 411     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 412         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 413             error_report("rerror is not supported by this bus type");
 414             return NULL;
 415         }
 416
 417         on_read_error = parse_block_error_action(buf, 1);
 418         if (on_read_error < 0) {
 419             return NULL;
 420         }
 421     }
 422
 423     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 424         if (type != IF_VIRTIO) {
 425             error_report("addr is not supported by this bus type");
 426             return NULL;
 427         }
 428     }
 429
 430     /* compute bus and unit according index */
 431
 432     if (index != -1) {
 433         if (bus_id != 0 || unit_id != -1) {
 434             error_report("index cannot be used with bus and unit");
 435             return NULL;
 436         }
 437         bus_id = drive_index_to_bus_id(type, index);
 438         unit_id = drive_index_to_unit_id(type, index);
 439     }
 440
 441     /* if user doesn't specify a unit_id,
 442      * try to find the first free
 443      */
 444
 445     if (unit_id == -1) {
 446        unit_id = 0;
 447        while (drive_get(type, bus_id, unit_id) != NULL) {
 448            unit_id++;
 449            if (max_devs && unit_id >= max_devs) {
 450                unit_id -= max_devs;
 451                bus_id++;
 452            }
 453        }
 454     }
 455
 456     /* check unit id */
 457
 458     if (max_devs && unit_id >= max_devs) {
 459         error_report("unit %d too big (max is %d)",
 460                      unit_id, max_devs - 1);
 461         return NULL;
 462     }
 463
 464     /*
 465      * catch multiple definitions
 466      */
 467
 468     if (drive_get(type, bus_id, unit_id) != NULL) {
 469         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 470                      bus_id, unit_id, index);
 471         return NULL;
 472     }
 473
 474     /* init */
 475
 476     dinfo = g_malloc0(sizeof(*dinfo));
 477     if ((buf = qemu_opts_id(opts)) != NULL) {
 478         dinfo->id = g_strdup(buf);
 479     } else {
 480         /* no id supplied -> create one */
 481         dinfo->id = g_malloc0(32);
 482         if (type == IF_IDE || type == IF_SCSI)
 483             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 484         if (max_devs)
 485             snprintf(dinfo->id, 32, "%s%i%s%i",
 486                      devname, bus_id, mediastr, unit_id);
 487         else
 488             snprintf(dinfo->id, 32, "%s%s%i",
 489                      devname, mediastr, unit_id);
 490     }
 491     dinfo->bdrv = bdrv_new(dinfo->id);
 492     dinfo->devaddr = devaddr;
 493     dinfo->type = type;
 494     dinfo->bus = bus_id;
 495     dinfo->unit = unit_id;
 496     dinfo->opts = opts;
 497     dinfo->refcount = 1;
 498     if (serial)
 499         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
 500     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 501
 502     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 503
 504     /* disk I/O throttling */
 505     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 506
 507     switch(type) {
 508     case IF_IDE:
 509     case IF_SCSI:
 510     case IF_XEN:
 511     case IF_NONE:
 512         switch(media) {
 513         case MEDIA_DISK:
 514             if (cyls != 0) {
 515                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
 516                 bdrv_set_translation_hint(dinfo->bdrv, translation);
 517             }
 518             break;
 519         case MEDIA_CDROM:
 520             dinfo->media_cd = 1;
 521             break;
 522         }
 523         break;
 524     case IF_SD:
 525     case IF_FLOPPY:
 526     case IF_PFLASH:
 527     case IF_MTD:
 528         break;
 529     case IF_VIRTIO:
 530         /* add virtio block device */
 531         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
 532         qemu_opt_set(opts, "driver", "virtio-blk");
 533         qemu_opt_set(opts, "drive", dinfo->id);
 534         if (devaddr)
 535             qemu_opt_set(opts, "addr", devaddr);
 536         break;
 537     default:
 538         abort();
 539     }
 540     if (!file || !*file) {
 541         return dinfo;
 542     }
 543     if (snapshot) {
 544         /* always use cache=unsafe with snapshot */
 545         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 546         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 547     }
 548
 549     if (media == MEDIA_CDROM) {
 550         /* CDROM is fine for any interface, don't check.  */
 551         ro = 1;
 552     } else if (ro == 1) {
 553         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
 554             error_report("readonly not supported by this bus type");
 555             goto err;
 556         }
 557     }
 558
 559     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 560
 561     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 562     if (ret < 0) {
 563         error_report("could not open disk image %s: %s",
 564                      file, strerror(-ret));
 565         goto err;
 566     }
 567
 568     if (bdrv_key_required(dinfo->bdrv))
 569         autostart = 0;
 570     return dinfo;
 571
 572 err:
 573     bdrv_delete(dinfo->bdrv);
 574     g_free(dinfo->id);
 575     QTAILQ_REMOVE(&drives, dinfo, next);
 576     g_free(dinfo);
 577     return NULL;
 578 }
 579
 580 void do_commit(Monitor *mon, const QDict *qdict)
 581 {
 582     const char *device = qdict_get_str(qdict, "device");
 583     BlockDriverState *bs;
 584
 585     if (!strcmp(device, "all")) {
 586         bdrv_commit_all();
 587     } else {
 588         bs = bdrv_find(device);
 589         if (!bs) {
 590             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 591             return;
 592         }
 593         bdrv_commit(bs);
 594     }
 595 }
 596
 597 int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
 598 {
 599     const char *device = qdict_get_str(qdict, "device");
 600     const char *filename = qdict_get_try_str(qdict, "snapshot-file");
 601     const char *format = qdict_get_try_str(qdict, "format");
 602     BlockDriverState *bs;
 603     BlockDriver *drv, *old_drv, *proto_drv;
 604     int ret = 0;
 605     int flags;
 606     char old_filename[1024];
 607
 608     if (!filename) {
 609         qerror_report(QERR_MISSING_PARAMETER, "snapshot-file");
 610         ret = -1;
 611         goto out;
 612     }
 613
 614     bs = bdrv_find(device);
 615     if (!bs) {
 616         qerror_report(QERR_DEVICE_NOT_FOUND, device);
 617         ret = -1;
 618         goto out;
 619     }
 620
 621     pstrcpy(old_filename, sizeof(old_filename), bs->filename);
 622
 623     old_drv = bs->drv;
 624     flags = bs->open_flags;
 625
 626     if (!format) {
 627         format = "qcow2";
 628     }
 629
 630     drv = bdrv_find_format(format);
 631     if (!drv) {
 632         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
 633         ret = -1;
 634         goto out;
 635     }
 636
 637     proto_drv = bdrv_find_protocol(filename);
 638     if (!proto_drv) {
 639         qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
 640         ret = -1;
 641         goto out;
 642     }
 643
 644     ret = bdrv_img_create(filename, format, bs->filename,
 645                           bs->drv->format_name, NULL, -1, flags);
 646     if (ret) {
 647         goto out;
 648     }
 649
 650     qemu_aio_flush();
 651     bdrv_flush(bs);
 652
 653     bdrv_close(bs);
 654     ret = bdrv_open(bs, filename, flags, drv);
 655     /*
 656      * If reopening the image file we just created fails, fall back
 657      * and try to re-open the original image. If that fails too, we
 658      * are in serious trouble.
 659      */
 660     if (ret != 0) {
 661         ret = bdrv_open(bs, old_filename, flags, old_drv);
 662         if (ret != 0) {
 663             qerror_report(QERR_OPEN_FILE_FAILED, old_filename);
 664         } else {
 665             qerror_report(QERR_OPEN_FILE_FAILED, filename);
 666         }
 667     }
 668 out:
 669     if (ret) {
 670         ret = -1;
 671     }
 672
 673     return ret;
 674 }
 675
 676 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
 677 {
 678     if (!bdrv_dev_has_removable_media(bs)) {
 679         qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 680         return -1;
 681     }
 682     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 683         bdrv_dev_eject_request(bs, force);
 684         if (!force) {
 685             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 686             return -1;
 687         }
 688     }
 689     bdrv_close(bs);
 690     return 0;
 691 }
 692
 693 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
 694 {
 695     BlockDriverState *bs;
 696     int force = qdict_get_try_bool(qdict, "force", 0);
 697     const char *filename = qdict_get_str(qdict, "device");
 698
 699     bs = bdrv_find(filename);
 700     if (!bs) {
 701         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
 702         return -1;
 703     }
 704     return eject_device(mon, bs, force);
 705 }
 706
 707 int do_block_set_passwd(Monitor *mon, const QDict *qdict,
 708                         QObject **ret_data)
 709 {
 710     BlockDriverState *bs;
 711     int err;
 712
 713     bs = bdrv_find(qdict_get_str(qdict, "device"));
 714     if (!bs) {
 715         qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
 716         return -1;
 717     }
 718
 719     err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
 720     if (err == -EINVAL) {
 721         qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 722         return -1;
 723     } else if (err < 0) {
 724         qerror_report(QERR_INVALID_PASSWORD);
 725         return -1;
 726     }
 727
 728     return 0;
 729 }
 730
 731 int do_change_block(Monitor *mon, const char *device,
 732                     const char *filename, const char *fmt)
 733 {
 734     BlockDriverState *bs;
 735     BlockDriver *drv = NULL;
 736     int bdrv_flags;
 737
 738     bs = bdrv_find(device);
 739     if (!bs) {
 740         qerror_report(QERR_DEVICE_NOT_FOUND, device);
 741         return -1;
 742     }
 743     if (fmt) {
 744         drv = bdrv_find_whitelisted_format(fmt);
 745         if (!drv) {
 746             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
 747             return -1;
 748         }
 749     }
 750     if (eject_device(mon, bs, 0) < 0) {
 751         return -1;
 752     }
 753     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 754     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 755     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 756         qerror_report(QERR_OPEN_FILE_FAILED, filename);
 757         return -1;
 758     }
 759     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
 760 }
 761
 762 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 763 {
 764     const char *id = qdict_get_str(qdict, "id");
 765     BlockDriverState *bs;
 766
 767     bs = bdrv_find(id);
 768     if (!bs) {
 769         qerror_report(QERR_DEVICE_NOT_FOUND, id);
 770         return -1;
 771     }
 772     if (bdrv_in_use(bs)) {
 773         qerror_report(QERR_DEVICE_IN_USE, id);
 774         return -1;
 775     }
 776
 777     /* quiesce block driver; prevent further io */
 778     qemu_aio_flush();
 779     bdrv_flush(bs);
 780     bdrv_close(bs);
 781
 782     /* if we have a device attached to this BlockDriverState
 783      * then we need to make the drive anonymous until the device
 784      * can be removed.  If this is a drive with no device backing
 785      * then we can just get rid of the block driver state right here.
 786      */
 787     if (bdrv_get_attached_dev(bs)) {
 788         bdrv_make_anon(bs);
 789     } else {
 790         drive_uninit(drive_get_by_blockdev(bs));
 791     }
 792
 793     return 0;
 794 }
 795
 796 /*
 797  * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
 798  * existing QERR_ macro mess is cleaned up.  A good example for better
 799  * error reports can be found in the qemu-img resize code.
 800  */
 801 int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
 802 {
 803     const char *device = qdict_get_str(qdict, "device");
 804     int64_t size = qdict_get_int(qdict, "size");
 805     BlockDriverState *bs;
 806
 807     bs = bdrv_find(device);
 808     if (!bs) {
 809         qerror_report(QERR_DEVICE_NOT_FOUND, device);
 810         return -1;
 811     }
 812
 813     if (size < 0) {
 814         qerror_report(QERR_UNDEFINED_ERROR);
 815         return -1;
 816     }
 817
 818     if (bdrv_truncate(bs, size)) {
 819         qerror_report(QERR_UNDEFINED_ERROR);
 820         return -1;
 821     }
 822
 823     return 0;
 824 }