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 #include "qmp-commands.h"
  19
  20 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  21
  22 static const char *const if_name[IF_COUNT] = {
  23     [IF_NONE] = "none",
  24     [IF_IDE] = "ide",
  25     [IF_SCSI] = "scsi",
  26     [IF_FLOPPY] = "floppy",
  27     [IF_PFLASH] = "pflash",
  28     [IF_MTD] = "mtd",
  29     [IF_SD] = "sd",
  30     [IF_VIRTIO] = "virtio",
  31     [IF_XEN] = "xen",
  32 };
  33
  34 static const int if_max_devs[IF_COUNT] = {
  35     /*
  36      * Do not change these numbers!  They govern how drive option
  37      * index maps to unit and bus.  That mapping is ABI.
  38      *
  39      * All controllers used to imlement if=T drives need to support
  40      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  41      * Otherwise, some index values map to "impossible" bus, unit
  42      * values.
  43      *
  44      * For instance, if you change [IF_SCSI] to 255, -drive
  45      * if=scsi,index=12 no longer means bus=1,unit=5, but
  46      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  47      * the drive can't be set up.  Regression.
  48      */
  49     [IF_IDE] = 2,
  50     [IF_SCSI] = 7,
  51 };
  52
  53 /*
  54  * We automatically delete the drive when a device using it gets
  55  * unplugged.  Questionable feature, but we can't just drop it.
  56  * Device models call blockdev_mark_auto_del() to schedule the
  57  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  58  * when deletion is actually safe.
  59  */
  60 void blockdev_mark_auto_del(BlockDriverState *bs)
  61 {
  62     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  63
  64     if (dinfo) {
  65         dinfo->auto_del = 1;
  66     }
  67 }
  68
  69 void blockdev_auto_del(BlockDriverState *bs)
  70 {
  71     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  72
  73     if (dinfo && dinfo->auto_del) {
  74         drive_put_ref(dinfo);
  75     }
  76 }
  77
  78 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
  79 {
  80     int max_devs = if_max_devs[type];
  81     return max_devs ? index / max_devs : 0;
  82 }
  83
  84 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
  85 {
  86     int max_devs = if_max_devs[type];
  87     return max_devs ? index % max_devs : index;
  88 }
  89
  90 QemuOpts *drive_def(const char *optstr)
  91 {
  92     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
  93 }
  94
  95 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
  96                     const char *optstr)
  97 {
  98     QemuOpts *opts;
  99     char buf[32];
 100
 101     opts = drive_def(optstr);
 102     if (!opts) {
 103         return NULL;
 104     }
 105     if (type != IF_DEFAULT) {
 106         qemu_opt_set(opts, "if", if_name[type]);
 107     }
 108     if (index >= 0) {
 109         snprintf(buf, sizeof(buf), "%d", index);
 110         qemu_opt_set(opts, "index", buf);
 111     }
 112     if (file)
 113         qemu_opt_set(opts, "file", file);
 114     return opts;
 115 }
 116
 117 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 118 {
 119     DriveInfo *dinfo;
 120
 121     /* seek interface, bus and unit */
 122
 123     QTAILQ_FOREACH(dinfo, &drives, next) {
 124         if (dinfo->type == type &&
 125             dinfo->bus == bus &&
 126             dinfo->unit == unit)
 127             return dinfo;
 128     }
 129
 130     return NULL;
 131 }
 132
 133 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 134 {
 135     return drive_get(type,
 136                      drive_index_to_bus_id(type, index),
 137                      drive_index_to_unit_id(type, index));
 138 }
 139
 140 int drive_get_max_bus(BlockInterfaceType type)
 141 {
 142     int max_bus;
 143     DriveInfo *dinfo;
 144
 145     max_bus = -1;
 146     QTAILQ_FOREACH(dinfo, &drives, next) {
 147         if(dinfo->type == type &&
 148            dinfo->bus > max_bus)
 149             max_bus = dinfo->bus;
 150     }
 151     return max_bus;
 152 }
 153
 154 /* Get a block device.  This should only be used for single-drive devices
 155    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 156    appropriate bus.  */
 157 DriveInfo *drive_get_next(BlockInterfaceType type)
 158 {
 159     static int next_block_unit[IF_COUNT];
 160
 161     return drive_get(type, 0, next_block_unit[type]++);
 162 }
 163
 164 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 165 {
 166     DriveInfo *dinfo;
 167
 168     QTAILQ_FOREACH(dinfo, &drives, next) {
 169         if (dinfo->bdrv == bs) {
 170             return dinfo;
 171         }
 172     }
 173     return NULL;
 174 }
 175
 176 static void bdrv_format_print(void *opaque, const char *name)
 177 {
 178     error_printf(" %s", name);
 179 }
 180
 181 static void drive_uninit(DriveInfo *dinfo)
 182 {
 183     qemu_opts_del(dinfo->opts);
 184     bdrv_delete(dinfo->bdrv);
 185     g_free(dinfo->id);
 186     QTAILQ_REMOVE(&drives, dinfo, next);
 187     g_free(dinfo);
 188 }
 189
 190 void drive_put_ref(DriveInfo *dinfo)
 191 {
 192     assert(dinfo->refcount);
 193     if (--dinfo->refcount == 0) {
 194         drive_uninit(dinfo);
 195     }
 196 }
 197
 198 void drive_get_ref(DriveInfo *dinfo)
 199 {
 200     dinfo->refcount++;
 201 }
 202
 203 static int parse_block_error_action(const char *buf, int is_read)
 204 {
 205     if (!strcmp(buf, "ignore")) {
 206         return BLOCK_ERR_IGNORE;
 207     } else if (!is_read && !strcmp(buf, "enospc")) {
 208         return BLOCK_ERR_STOP_ENOSPC;
 209     } else if (!strcmp(buf, "stop")) {
 210         return BLOCK_ERR_STOP_ANY;
 211     } else if (!strcmp(buf, "report")) {
 212         return BLOCK_ERR_REPORT;
 213     } else {
 214         error_report("'%s' invalid %s error action",
 215                      buf, is_read ? "read" : "write");
 216         return -1;
 217     }
 218 }
 219
 220 static bool do_check_io_limits(BlockIOLimit *io_limits)
 221 {
 222     bool bps_flag;
 223     bool iops_flag;
 224
 225     assert(io_limits);
 226
 227     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 228                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 229                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 230     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 231                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 232                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 233     if (bps_flag || iops_flag) {
 234         return false;
 235     }
 236
 237     return true;
 238 }
 239
 240 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
 241 {
 242     const char *buf;
 243     const char *file = NULL;
 244     char devname[128];
 245     const char *serial;
 246     const char *mediastr = "";
 247     BlockInterfaceType type;
 248     enum { MEDIA_DISK, MEDIA_CDROM } media;
 249     int bus_id, unit_id;
 250     int cyls, heads, secs, translation;
 251     BlockDriver *drv = NULL;
 252     int max_devs;
 253     int index;
 254     int ro = 0;
 255     int bdrv_flags = 0;
 256     int on_read_error, on_write_error;
 257     const char *devaddr;
 258     DriveInfo *dinfo;
 259     BlockIOLimit io_limits;
 260     int snapshot = 0;
 261     bool copy_on_read;
 262     int ret;
 263
 264     translation = BIOS_ATA_TRANSLATION_AUTO;
 265     media = MEDIA_DISK;
 266
 267     /* extract parameters */
 268     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 269     unit_id = qemu_opt_get_number(opts, "unit", -1);
 270     index   = qemu_opt_get_number(opts, "index", -1);
 271
 272     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 273     heads = qemu_opt_get_number(opts, "heads", 0);
 274     secs  = qemu_opt_get_number(opts, "secs", 0);
 275
 276     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 277     ro = qemu_opt_get_bool(opts, "readonly", 0);
 278     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 279
 280     file = qemu_opt_get(opts, "file");
 281     serial = qemu_opt_get(opts, "serial");
 282
 283     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 284         pstrcpy(devname, sizeof(devname), buf);
 285         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 286             ;
 287         if (type == IF_COUNT) {
 288             error_report("unsupported bus type '%s'", buf);
 289             return NULL;
 290         }
 291     } else {
 292         type = default_to_scsi ? IF_SCSI : IF_IDE;
 293         pstrcpy(devname, sizeof(devname), if_name[type]);
 294     }
 295
 296     max_devs = if_max_devs[type];
 297
 298     if (cyls || heads || secs) {
 299         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
 300             error_report("invalid physical cyls number");
 301             return NULL;
 302         }
 303         if (heads < 1 || (type == IF_IDE && heads > 16)) {
 304             error_report("invalid physical heads number");
 305             return NULL;
 306         }
 307         if (secs < 1 || (type == IF_IDE && secs > 63)) {
 308             error_report("invalid physical secs number");
 309             return NULL;
 310         }
 311     }
 312
 313     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 314         if (!cyls) {
 315             error_report("'%s' trans must be used with cyls, heads and secs",
 316                          buf);
 317             return NULL;
 318         }
 319         if (!strcmp(buf, "none"))
 320             translation = BIOS_ATA_TRANSLATION_NONE;
 321         else if (!strcmp(buf, "lba"))
 322             translation = BIOS_ATA_TRANSLATION_LBA;
 323         else if (!strcmp(buf, "auto"))
 324             translation = BIOS_ATA_TRANSLATION_AUTO;
 325         else {
 326             error_report("'%s' invalid translation type", buf);
 327             return NULL;
 328         }
 329     }
 330
 331     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 332         if (!strcmp(buf, "disk")) {
 333             media = MEDIA_DISK;
 334         } else if (!strcmp(buf, "cdrom")) {
 335             if (cyls || secs || heads) {
 336                 error_report("CHS can't be set with media=%s", buf);
 337                 return NULL;
 338             }
 339             media = MEDIA_CDROM;
 340         } else {
 341             error_report("'%s' invalid media", buf);
 342             return NULL;
 343         }
 344     }
 345
 346     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 347         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 348             error_report("invalid cache option");
 349             return NULL;
 350         }
 351     }
 352
 353 #ifdef CONFIG_LINUX_AIO
 354     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 355         if (!strcmp(buf, "native")) {
 356             bdrv_flags |= BDRV_O_NATIVE_AIO;
 357         } else if (!strcmp(buf, "threads")) {
 358             /* this is the default */
 359         } else {
 360            error_report("invalid aio option");
 361            return NULL;
 362         }
 363     }
 364 #endif
 365
 366     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 367        if (strcmp(buf, "?") == 0) {
 368            error_printf("Supported formats:");
 369            bdrv_iterate_format(bdrv_format_print, NULL);
 370            error_printf("\n");
 371            return NULL;
 372         }
 373         drv = bdrv_find_whitelisted_format(buf);
 374         if (!drv) {
 375             error_report("'%s' invalid format", buf);
 376             return NULL;
 377         }
 378     }
 379
 380     /* disk I/O throttling */
 381     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 382                            qemu_opt_get_number(opts, "bps", 0);
 383     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 384                            qemu_opt_get_number(opts, "bps_rd", 0);
 385     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 386                            qemu_opt_get_number(opts, "bps_wr", 0);
 387     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 388                            qemu_opt_get_number(opts, "iops", 0);
 389     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 390                            qemu_opt_get_number(opts, "iops_rd", 0);
 391     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 392                            qemu_opt_get_number(opts, "iops_wr", 0);
 393
 394     if (!do_check_io_limits(&io_limits)) {
 395         error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 396                      "cannot be used at the same time");
 397         return NULL;
 398     }
 399
 400     if (qemu_opt_get(opts, "boot") != NULL) {
 401         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 402                 "ignored. Future versions will reject this parameter. Please "
 403                 "update your scripts.\n");
 404     }
 405
 406     on_write_error = BLOCK_ERR_STOP_ENOSPC;
 407     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 408         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 409             error_report("werror is not supported by this bus type");
 410             return NULL;
 411         }
 412
 413         on_write_error = parse_block_error_action(buf, 0);
 414         if (on_write_error < 0) {
 415             return NULL;
 416         }
 417     }
 418
 419     on_read_error = BLOCK_ERR_REPORT;
 420     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 421         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 422             error_report("rerror is not supported by this bus type");
 423             return NULL;
 424         }
 425
 426         on_read_error = parse_block_error_action(buf, 1);
 427         if (on_read_error < 0) {
 428             return NULL;
 429         }
 430     }
 431
 432     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 433         if (type != IF_VIRTIO) {
 434             error_report("addr is not supported by this bus type");
 435             return NULL;
 436         }
 437     }
 438
 439     /* compute bus and unit according index */
 440
 441     if (index != -1) {
 442         if (bus_id != 0 || unit_id != -1) {
 443             error_report("index cannot be used with bus and unit");
 444             return NULL;
 445         }
 446         bus_id = drive_index_to_bus_id(type, index);
 447         unit_id = drive_index_to_unit_id(type, index);
 448     }
 449
 450     /* if user doesn't specify a unit_id,
 451      * try to find the first free
 452      */
 453
 454     if (unit_id == -1) {
 455        unit_id = 0;
 456        while (drive_get(type, bus_id, unit_id) != NULL) {
 457            unit_id++;
 458            if (max_devs && unit_id >= max_devs) {
 459                unit_id -= max_devs;
 460                bus_id++;
 461            }
 462        }
 463     }
 464
 465     /* check unit id */
 466
 467     if (max_devs && unit_id >= max_devs) {
 468         error_report("unit %d too big (max is %d)",
 469                      unit_id, max_devs - 1);
 470         return NULL;
 471     }
 472
 473     /*
 474      * catch multiple definitions
 475      */
 476
 477     if (drive_get(type, bus_id, unit_id) != NULL) {
 478         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 479                      bus_id, unit_id, index);
 480         return NULL;
 481     }
 482
 483     /* init */
 484
 485     dinfo = g_malloc0(sizeof(*dinfo));
 486     if ((buf = qemu_opts_id(opts)) != NULL) {
 487         dinfo->id = g_strdup(buf);
 488     } else {
 489         /* no id supplied -> create one */
 490         dinfo->id = g_malloc0(32);
 491         if (type == IF_IDE || type == IF_SCSI)
 492             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 493         if (max_devs)
 494             snprintf(dinfo->id, 32, "%s%i%s%i",
 495                      devname, bus_id, mediastr, unit_id);
 496         else
 497             snprintf(dinfo->id, 32, "%s%s%i",
 498                      devname, mediastr, unit_id);
 499     }
 500     dinfo->bdrv = bdrv_new(dinfo->id);
 501     dinfo->devaddr = devaddr;
 502     dinfo->type = type;
 503     dinfo->bus = bus_id;
 504     dinfo->unit = unit_id;
 505     dinfo->opts = opts;
 506     dinfo->refcount = 1;
 507     if (serial)
 508         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
 509     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 510
 511     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 512
 513     /* disk I/O throttling */
 514     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 515
 516     switch(type) {
 517     case IF_IDE:
 518     case IF_SCSI:
 519     case IF_XEN:
 520     case IF_NONE:
 521         switch(media) {
 522         case MEDIA_DISK:
 523             if (cyls != 0) {
 524                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
 525                 bdrv_set_translation_hint(dinfo->bdrv, translation);
 526             }
 527             break;
 528         case MEDIA_CDROM:
 529             dinfo->media_cd = 1;
 530             break;
 531         }
 532         break;
 533     case IF_SD:
 534     case IF_FLOPPY:
 535     case IF_PFLASH:
 536     case IF_MTD:
 537         break;
 538     case IF_VIRTIO:
 539         /* add virtio block device */
 540         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
 541         qemu_opt_set(opts, "driver", "virtio-blk");
 542         qemu_opt_set(opts, "drive", dinfo->id);
 543         if (devaddr)
 544             qemu_opt_set(opts, "addr", devaddr);
 545         break;
 546     default:
 547         abort();
 548     }
 549     if (!file || !*file) {
 550         return dinfo;
 551     }
 552     if (snapshot) {
 553         /* always use cache=unsafe with snapshot */
 554         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 555         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 556     }
 557
 558     if (copy_on_read) {
 559         bdrv_flags |= BDRV_O_COPY_ON_READ;
 560     }
 561
 562     if (media == MEDIA_CDROM) {
 563         /* CDROM is fine for any interface, don't check.  */
 564         ro = 1;
 565     } else if (ro == 1) {
 566         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
 567             error_report("readonly not supported by this bus type");
 568             goto err;
 569         }
 570     }
 571
 572     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 573
 574     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 575     if (ret < 0) {
 576         error_report("could not open disk image %s: %s",
 577                      file, strerror(-ret));
 578         goto err;
 579     }
 580
 581     if (bdrv_key_required(dinfo->bdrv))
 582         autostart = 0;
 583     return dinfo;
 584
 585 err:
 586     bdrv_delete(dinfo->bdrv);
 587     g_free(dinfo->id);
 588     QTAILQ_REMOVE(&drives, dinfo, next);
 589     g_free(dinfo);
 590     return NULL;
 591 }
 592
 593 void do_commit(Monitor *mon, const QDict *qdict)
 594 {
 595     const char *device = qdict_get_str(qdict, "device");
 596     BlockDriverState *bs;
 597
 598     if (!strcmp(device, "all")) {
 599         bdrv_commit_all();
 600     } else {
 601         bs = bdrv_find(device);
 602         if (!bs) {
 603             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 604             return;
 605         }
 606         bdrv_commit(bs);
 607     }
 608 }
 609
 610 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 611                                 bool has_format, const char *format,
 612                                 Error **errp)
 613 {
 614     BlockDriverState *bs;
 615     BlockDriver *drv, *old_drv, *proto_drv;
 616     int ret = 0;
 617     int flags;
 618     char old_filename[1024];
 619
 620     bs = bdrv_find(device);
 621     if (!bs) {
 622         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 623         return;
 624     }
 625
 626     pstrcpy(old_filename, sizeof(old_filename), bs->filename);
 627
 628     old_drv = bs->drv;
 629     flags = bs->open_flags;
 630
 631     if (!has_format) {
 632         format = "qcow2";
 633     }
 634
 635     drv = bdrv_find_format(format);
 636     if (!drv) {
 637         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 638         return;
 639     }
 640
 641     proto_drv = bdrv_find_protocol(snapshot_file);
 642     if (!proto_drv) {
 643         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 644         return;
 645     }
 646
 647     ret = bdrv_img_create(snapshot_file, format, bs->filename,
 648                           bs->drv->format_name, NULL, -1, flags);
 649     if (ret) {
 650         error_set(errp, QERR_UNDEFINED_ERROR);
 651         return;
 652     }
 653
 654     bdrv_drain_all();
 655     bdrv_flush(bs);
 656
 657     bdrv_close(bs);
 658     ret = bdrv_open(bs, snapshot_file, flags, drv);
 659     /*
 660      * If reopening the image file we just created fails, fall back
 661      * and try to re-open the original image. If that fails too, we
 662      * are in serious trouble.
 663      */
 664     if (ret != 0) {
 665         ret = bdrv_open(bs, old_filename, flags, old_drv);
 666         if (ret != 0) {
 667             error_set(errp, QERR_OPEN_FILE_FAILED, old_filename);
 668         } else {
 669             error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file);
 670         }
 671     }
 672 }
 673
 674 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
 675 {
 676     if (!bdrv_dev_has_removable_media(bs)) {
 677         qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 678         return -1;
 679     }
 680     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 681         bdrv_dev_eject_request(bs, force);
 682         if (!force) {
 683             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 684             return -1;
 685         }
 686     }
 687     bdrv_close(bs);
 688     return 0;
 689 }
 690
 691 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
 692 {
 693     BlockDriverState *bs;
 694     int force = qdict_get_try_bool(qdict, "force", 0);
 695     const char *filename = qdict_get_str(qdict, "device");
 696
 697     bs = bdrv_find(filename);
 698     if (!bs) {
 699         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
 700         return -1;
 701     }
 702     return eject_device(mon, bs, force);
 703 }
 704
 705 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 706 {
 707     BlockDriverState *bs;
 708     int err;
 709
 710     bs = bdrv_find(device);
 711     if (!bs) {
 712         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 713         return;
 714     }
 715
 716     err = bdrv_set_key(bs, password);
 717     if (err == -EINVAL) {
 718         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 719         return;
 720     } else if (err < 0) {
 721         error_set(errp, QERR_INVALID_PASSWORD);
 722         return;
 723     }
 724 }
 725
 726 int do_change_block(Monitor *mon, const char *device,
 727                     const char *filename, const char *fmt)
 728 {
 729     BlockDriverState *bs;
 730     BlockDriver *drv = NULL;
 731     int bdrv_flags;
 732
 733     bs = bdrv_find(device);
 734     if (!bs) {
 735         qerror_report(QERR_DEVICE_NOT_FOUND, device);
 736         return -1;
 737     }
 738     if (fmt) {
 739         drv = bdrv_find_whitelisted_format(fmt);
 740         if (!drv) {
 741             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
 742             return -1;
 743         }
 744     }
 745     if (eject_device(mon, bs, 0) < 0) {
 746         return -1;
 747     }
 748     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 749     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 750     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 751         qerror_report(QERR_OPEN_FILE_FAILED, filename);
 752         return -1;
 753     }
 754     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
 755 }
 756
 757 /* throttling disk I/O limits */
 758 int do_block_set_io_throttle(Monitor *mon,
 759                        const QDict *qdict, QObject **ret_data)
 760 {
 761     BlockIOLimit io_limits;
 762     const char *devname = qdict_get_str(qdict, "device");
 763     BlockDriverState *bs;
 764
 765     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]
 766                         = qdict_get_try_int(qdict, "bps", -1);
 767     io_limits.bps[BLOCK_IO_LIMIT_READ]
 768                         = qdict_get_try_int(qdict, "bps_rd", -1);
 769     io_limits.bps[BLOCK_IO_LIMIT_WRITE]
 770                         = qdict_get_try_int(qdict, "bps_wr", -1);
 771     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]
 772                         = qdict_get_try_int(qdict, "iops", -1);
 773     io_limits.iops[BLOCK_IO_LIMIT_READ]
 774                         = qdict_get_try_int(qdict, "iops_rd", -1);
 775     io_limits.iops[BLOCK_IO_LIMIT_WRITE]
 776                         = qdict_get_try_int(qdict, "iops_wr", -1);
 777
 778     bs = bdrv_find(devname);
 779     if (!bs) {
 780         qerror_report(QERR_DEVICE_NOT_FOUND, devname);
 781         return -1;
 782     }
 783
 784     if ((io_limits.bps[BLOCK_IO_LIMIT_TOTAL] == -1)
 785         || (io_limits.bps[BLOCK_IO_LIMIT_READ] == -1)
 786         || (io_limits.bps[BLOCK_IO_LIMIT_WRITE] == -1)
 787         || (io_limits.iops[BLOCK_IO_LIMIT_TOTAL] == -1)
 788         || (io_limits.iops[BLOCK_IO_LIMIT_READ] == -1)
 789         || (io_limits.iops[BLOCK_IO_LIMIT_WRITE] == -1)) {
 790         qerror_report(QERR_MISSING_PARAMETER,
 791                       "bps/bps_rd/bps_wr/iops/iops_rd/iops_wr");
 792         return -1;
 793     }
 794
 795     if (!do_check_io_limits(&io_limits)) {
 796         qerror_report(QERR_INVALID_PARAMETER_COMBINATION);
 797         return -1;
 798     }
 799
 800     bs->io_limits = io_limits;
 801     bs->slice_time = BLOCK_IO_SLICE_TIME;
 802
 803     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 804         bdrv_io_limits_enable(bs);
 805     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 806         bdrv_io_limits_disable(bs);
 807     } else {
 808         if (bs->block_timer) {
 809             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 810         }
 811     }
 812
 813     return 0;
 814 }
 815
 816 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 817 {
 818     const char *id = qdict_get_str(qdict, "id");
 819     BlockDriverState *bs;
 820
 821     bs = bdrv_find(id);
 822     if (!bs) {
 823         qerror_report(QERR_DEVICE_NOT_FOUND, id);
 824         return -1;
 825     }
 826     if (bdrv_in_use(bs)) {
 827         qerror_report(QERR_DEVICE_IN_USE, id);
 828         return -1;
 829     }
 830
 831     /* quiesce block driver; prevent further io */
 832     bdrv_drain_all();
 833     bdrv_flush(bs);
 834     bdrv_close(bs);
 835
 836     /* if we have a device attached to this BlockDriverState
 837      * then we need to make the drive anonymous until the device
 838      * can be removed.  If this is a drive with no device backing
 839      * then we can just get rid of the block driver state right here.
 840      */
 841     if (bdrv_get_attached_dev(bs)) {
 842         bdrv_make_anon(bs);
 843     } else {
 844         drive_uninit(drive_get_by_blockdev(bs));
 845     }
 846
 847     return 0;
 848 }
 849
 850 /*
 851  * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
 852  * existing QERR_ macro mess is cleaned up.  A good example for better
 853  * error reports can be found in the qemu-img resize code.
 854  */
 855 void qmp_block_resize(const char *device, int64_t size, Error **errp)
 856 {
 857     BlockDriverState *bs;
 858
 859     bs = bdrv_find(device);
 860     if (!bs) {
 861         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 862         return;
 863     }
 864
 865     if (size < 0) {
 866         error_set(errp, QERR_UNDEFINED_ERROR);
 867         return;
 868     }
 869
 870     if (bdrv_truncate(bs, size)) {
 871         error_set(errp, QERR_UNDEFINED_ERROR);
 872         return;
 873     }
 874 }