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 "sysemu/blockdev.h"
  11 #include "hw/block-common.h"
  12 #include "block/blockjob.h"
  13 #include "monitor/monitor.h"
  14 #include "qapi/qmp/qerror.h"
  15 #include "qemu/option.h"
  16 #include "qemu/config-file.h"
  17 #include "qapi/qmp/types.h"
  18 #include "sysemu/sysemu.h"
  19 #include "block/block_int.h"
  20 #include "qmp-commands.h"
  21 #include "trace.h"
  22 #include "sysemu/arch_init.h"
  23
  24 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  25
  26 static const char *const if_name[IF_COUNT] = {
  27     [IF_NONE] = "none",
  28     [IF_IDE] = "ide",
  29     [IF_SCSI] = "scsi",
  30     [IF_FLOPPY] = "floppy",
  31     [IF_PFLASH] = "pflash",
  32     [IF_MTD] = "mtd",
  33     [IF_SD] = "sd",
  34     [IF_VIRTIO] = "virtio",
  35     [IF_XEN] = "xen",
  36 };
  37
  38 static const int if_max_devs[IF_COUNT] = {
  39     /*
  40      * Do not change these numbers!  They govern how drive option
  41      * index maps to unit and bus.  That mapping is ABI.
  42      *
  43      * All controllers used to imlement if=T drives need to support
  44      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  45      * Otherwise, some index values map to "impossible" bus, unit
  46      * values.
  47      *
  48      * For instance, if you change [IF_SCSI] to 255, -drive
  49      * if=scsi,index=12 no longer means bus=1,unit=5, but
  50      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  51      * the drive can't be set up.  Regression.
  52      */
  53     [IF_IDE] = 2,
  54     [IF_SCSI] = 7,
  55 };
  56
  57 /*
  58  * We automatically delete the drive when a device using it gets
  59  * unplugged.  Questionable feature, but we can't just drop it.
  60  * Device models call blockdev_mark_auto_del() to schedule the
  61  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  62  * when deletion is actually safe.
  63  */
  64 void blockdev_mark_auto_del(BlockDriverState *bs)
  65 {
  66     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  67
  68     if (bs->job) {
  69         block_job_cancel(bs->job);
  70     }
  71     if (dinfo) {
  72         dinfo->auto_del = 1;
  73     }
  74 }
  75
  76 void blockdev_auto_del(BlockDriverState *bs)
  77 {
  78     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  79
  80     if (dinfo && dinfo->auto_del) {
  81         drive_put_ref(dinfo);
  82     }
  83 }
  84
  85 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
  86 {
  87     int max_devs = if_max_devs[type];
  88     return max_devs ? index / max_devs : 0;
  89 }
  90
  91 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
  92 {
  93     int max_devs = if_max_devs[type];
  94     return max_devs ? index % max_devs : index;
  95 }
  96
  97 QemuOpts *drive_def(const char *optstr)
  98 {
  99     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
 100 }
 101
 102 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 103                     const char *optstr)
 104 {
 105     QemuOpts *opts;
 106     char buf[32];
 107
 108     opts = drive_def(optstr);
 109     if (!opts) {
 110         return NULL;
 111     }
 112     if (type != IF_DEFAULT) {
 113         qemu_opt_set(opts, "if", if_name[type]);
 114     }
 115     if (index >= 0) {
 116         snprintf(buf, sizeof(buf), "%d", index);
 117         qemu_opt_set(opts, "index", buf);
 118     }
 119     if (file)
 120         qemu_opt_set(opts, "file", file);
 121     return opts;
 122 }
 123
 124 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 125 {
 126     DriveInfo *dinfo;
 127
 128     /* seek interface, bus and unit */
 129
 130     QTAILQ_FOREACH(dinfo, &drives, next) {
 131         if (dinfo->type == type &&
 132             dinfo->bus == bus &&
 133             dinfo->unit == unit)
 134             return dinfo;
 135     }
 136
 137     return NULL;
 138 }
 139
 140 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 141 {
 142     return drive_get(type,
 143                      drive_index_to_bus_id(type, index),
 144                      drive_index_to_unit_id(type, index));
 145 }
 146
 147 int drive_get_max_bus(BlockInterfaceType type)
 148 {
 149     int max_bus;
 150     DriveInfo *dinfo;
 151
 152     max_bus = -1;
 153     QTAILQ_FOREACH(dinfo, &drives, next) {
 154         if(dinfo->type == type &&
 155            dinfo->bus > max_bus)
 156             max_bus = dinfo->bus;
 157     }
 158     return max_bus;
 159 }
 160
 161 /* Get a block device.  This should only be used for single-drive devices
 162    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 163    appropriate bus.  */
 164 DriveInfo *drive_get_next(BlockInterfaceType type)
 165 {
 166     static int next_block_unit[IF_COUNT];
 167
 168     return drive_get(type, 0, next_block_unit[type]++);
 169 }
 170
 171 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 172 {
 173     DriveInfo *dinfo;
 174
 175     QTAILQ_FOREACH(dinfo, &drives, next) {
 176         if (dinfo->bdrv == bs) {
 177             return dinfo;
 178         }
 179     }
 180     return NULL;
 181 }
 182
 183 static void bdrv_format_print(void *opaque, const char *name)
 184 {
 185     error_printf(" %s", name);
 186 }
 187
 188 static void drive_uninit(DriveInfo *dinfo)
 189 {
 190     qemu_opts_del(dinfo->opts);
 191     bdrv_delete(dinfo->bdrv);
 192     g_free(dinfo->id);
 193     QTAILQ_REMOVE(&drives, dinfo, next);
 194     g_free(dinfo);
 195 }
 196
 197 void drive_put_ref(DriveInfo *dinfo)
 198 {
 199     assert(dinfo->refcount);
 200     if (--dinfo->refcount == 0) {
 201         drive_uninit(dinfo);
 202     }
 203 }
 204
 205 void drive_get_ref(DriveInfo *dinfo)
 206 {
 207     dinfo->refcount++;
 208 }
 209
 210 typedef struct {
 211     QEMUBH *bh;
 212     DriveInfo *dinfo;
 213 } DrivePutRefBH;
 214
 215 static void drive_put_ref_bh(void *opaque)
 216 {
 217     DrivePutRefBH *s = opaque;
 218
 219     drive_put_ref(s->dinfo);
 220     qemu_bh_delete(s->bh);
 221     g_free(s);
 222 }
 223
 224 /*
 225  * Release a drive reference in a BH
 226  *
 227  * It is not possible to use drive_put_ref() from a callback function when the
 228  * callers still need the drive.  In such cases we schedule a BH to release the
 229  * reference.
 230  */
 231 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
 232 {
 233     DrivePutRefBH *s;
 234
 235     s = g_new(DrivePutRefBH, 1);
 236     s->bh = qemu_bh_new(drive_put_ref_bh, s);
 237     s->dinfo = dinfo;
 238     qemu_bh_schedule(s->bh);
 239 }
 240
 241 static int parse_block_error_action(const char *buf, bool is_read)
 242 {
 243     if (!strcmp(buf, "ignore")) {
 244         return BLOCKDEV_ON_ERROR_IGNORE;
 245     } else if (!is_read && !strcmp(buf, "enospc")) {
 246         return BLOCKDEV_ON_ERROR_ENOSPC;
 247     } else if (!strcmp(buf, "stop")) {
 248         return BLOCKDEV_ON_ERROR_STOP;
 249     } else if (!strcmp(buf, "report")) {
 250         return BLOCKDEV_ON_ERROR_REPORT;
 251     } else {
 252         error_report("'%s' invalid %s error action",
 253                      buf, is_read ? "read" : "write");
 254         return -1;
 255     }
 256 }
 257
 258 static bool do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
 259 {
 260     bool bps_flag;
 261     bool iops_flag;
 262
 263     assert(io_limits);
 264
 265     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 266                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 267                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 268     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 269                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 270                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 271     if (bps_flag || iops_flag) {
 272         error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 273                          "cannot be used at the same time");
 274         return false;
 275     }
 276
 277     if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 278         io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
 279         io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
 280         io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 281         io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
 282         io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
 283         error_setg(errp, "bps and iops values must be 0 or greater");
 284         return false;
 285     }
 286
 287     return true;
 288 }
 289
 290 DriveInfo *drive_init(QemuOpts *opts, BlockInterfaceType block_default_type)
 291 {
 292     const char *buf;
 293     const char *file = NULL;
 294     const char *serial;
 295     const char *mediastr = "";
 296     BlockInterfaceType type;
 297     enum { MEDIA_DISK, MEDIA_CDROM } media;
 298     int bus_id, unit_id;
 299     int cyls, heads, secs, translation;
 300     BlockDriver *drv = NULL;
 301     int max_devs;
 302     int index;
 303     int ro = 0;
 304     int bdrv_flags = 0;
 305     int on_read_error, on_write_error;
 306     const char *devaddr;
 307     DriveInfo *dinfo;
 308     BlockIOLimit io_limits;
 309     int snapshot = 0;
 310     bool copy_on_read;
 311     int ret;
 312     Error *error = NULL;
 313
 314     translation = BIOS_ATA_TRANSLATION_AUTO;
 315     media = MEDIA_DISK;
 316
 317     /* extract parameters */
 318     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 319     unit_id = qemu_opt_get_number(opts, "unit", -1);
 320     index   = qemu_opt_get_number(opts, "index", -1);
 321
 322     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 323     heads = qemu_opt_get_number(opts, "heads", 0);
 324     secs  = qemu_opt_get_number(opts, "secs", 0);
 325
 326     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 327     ro = qemu_opt_get_bool(opts, "readonly", 0);
 328     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 329
 330     file = qemu_opt_get(opts, "file");
 331     serial = qemu_opt_get(opts, "serial");
 332
 333     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 334         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 335             ;
 336         if (type == IF_COUNT) {
 337             error_report("unsupported bus type '%s'", buf);
 338             return NULL;
 339         }
 340     } else {
 341         type = block_default_type;
 342     }
 343
 344     max_devs = if_max_devs[type];
 345
 346     if (cyls || heads || secs) {
 347         if (cyls < 1) {
 348             error_report("invalid physical cyls number");
 349             return NULL;
 350         }
 351         if (heads < 1) {
 352             error_report("invalid physical heads number");
 353             return NULL;
 354         }
 355         if (secs < 1) {
 356             error_report("invalid physical secs number");
 357             return NULL;
 358         }
 359     }
 360
 361     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 362         if (!cyls) {
 363             error_report("'%s' trans must be used with cyls, heads and secs",
 364                          buf);
 365             return NULL;
 366         }
 367         if (!strcmp(buf, "none"))
 368             translation = BIOS_ATA_TRANSLATION_NONE;
 369         else if (!strcmp(buf, "lba"))
 370             translation = BIOS_ATA_TRANSLATION_LBA;
 371         else if (!strcmp(buf, "auto"))
 372             translation = BIOS_ATA_TRANSLATION_AUTO;
 373         else {
 374             error_report("'%s' invalid translation type", buf);
 375             return NULL;
 376         }
 377     }
 378
 379     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 380         if (!strcmp(buf, "disk")) {
 381             media = MEDIA_DISK;
 382         } else if (!strcmp(buf, "cdrom")) {
 383             if (cyls || secs || heads) {
 384                 error_report("CHS can't be set with media=%s", buf);
 385                 return NULL;
 386             }
 387             media = MEDIA_CDROM;
 388         } else {
 389             error_report("'%s' invalid media", buf);
 390             return NULL;
 391         }
 392     }
 393
 394     bdrv_flags |= BDRV_O_CACHE_WB;
 395     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 396         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 397             error_report("invalid cache option");
 398             return NULL;
 399         }
 400     }
 401
 402 #ifdef CONFIG_LINUX_AIO
 403     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 404         if (!strcmp(buf, "native")) {
 405             bdrv_flags |= BDRV_O_NATIVE_AIO;
 406         } else if (!strcmp(buf, "threads")) {
 407             /* this is the default */
 408         } else {
 409            error_report("invalid aio option");
 410            return NULL;
 411         }
 412     }
 413 #endif
 414
 415     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 416         if (is_help_option(buf)) {
 417             error_printf("Supported formats:");
 418             bdrv_iterate_format(bdrv_format_print, NULL);
 419             error_printf("\n");
 420             return NULL;
 421         }
 422         drv = bdrv_find_whitelisted_format(buf);
 423         if (!drv) {
 424             error_report("'%s' invalid format", buf);
 425             return NULL;
 426         }
 427     }
 428
 429     /* disk I/O throttling */
 430     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 431                            qemu_opt_get_number(opts, "bps", 0);
 432     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 433                            qemu_opt_get_number(opts, "bps_rd", 0);
 434     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 435                            qemu_opt_get_number(opts, "bps_wr", 0);
 436     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 437                            qemu_opt_get_number(opts, "iops", 0);
 438     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 439                            qemu_opt_get_number(opts, "iops_rd", 0);
 440     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 441                            qemu_opt_get_number(opts, "iops_wr", 0);
 442
 443     if (!do_check_io_limits(&io_limits, &error)) {
 444         error_report("%s", error_get_pretty(error));
 445         error_free(error);
 446         return NULL;
 447     }
 448
 449     if (qemu_opt_get(opts, "boot") != NULL) {
 450         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 451                 "ignored. Future versions will reject this parameter. Please "
 452                 "update your scripts.\n");
 453     }
 454
 455     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 456     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 457         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 458             error_report("werror is not supported by this bus type");
 459             return NULL;
 460         }
 461
 462         on_write_error = parse_block_error_action(buf, 0);
 463         if (on_write_error < 0) {
 464             return NULL;
 465         }
 466     }
 467
 468     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 469     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 470         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 471             error_report("rerror is not supported by this bus type");
 472             return NULL;
 473         }
 474
 475         on_read_error = parse_block_error_action(buf, 1);
 476         if (on_read_error < 0) {
 477             return NULL;
 478         }
 479     }
 480
 481     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 482         if (type != IF_VIRTIO) {
 483             error_report("addr is not supported by this bus type");
 484             return NULL;
 485         }
 486     }
 487
 488     /* compute bus and unit according index */
 489
 490     if (index != -1) {
 491         if (bus_id != 0 || unit_id != -1) {
 492             error_report("index cannot be used with bus and unit");
 493             return NULL;
 494         }
 495         bus_id = drive_index_to_bus_id(type, index);
 496         unit_id = drive_index_to_unit_id(type, index);
 497     }
 498
 499     /* if user doesn't specify a unit_id,
 500      * try to find the first free
 501      */
 502
 503     if (unit_id == -1) {
 504        unit_id = 0;
 505        while (drive_get(type, bus_id, unit_id) != NULL) {
 506            unit_id++;
 507            if (max_devs && unit_id >= max_devs) {
 508                unit_id -= max_devs;
 509                bus_id++;
 510            }
 511        }
 512     }
 513
 514     /* check unit id */
 515
 516     if (max_devs && unit_id >= max_devs) {
 517         error_report("unit %d too big (max is %d)",
 518                      unit_id, max_devs - 1);
 519         return NULL;
 520     }
 521
 522     /*
 523      * catch multiple definitions
 524      */
 525
 526     if (drive_get(type, bus_id, unit_id) != NULL) {
 527         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 528                      bus_id, unit_id, index);
 529         return NULL;
 530     }
 531
 532     /* init */
 533
 534     dinfo = g_malloc0(sizeof(*dinfo));
 535     if ((buf = qemu_opts_id(opts)) != NULL) {
 536         dinfo->id = g_strdup(buf);
 537     } else {
 538         /* no id supplied -> create one */
 539         dinfo->id = g_malloc0(32);
 540         if (type == IF_IDE || type == IF_SCSI)
 541             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 542         if (max_devs)
 543             snprintf(dinfo->id, 32, "%s%i%s%i",
 544                      if_name[type], bus_id, mediastr, unit_id);
 545         else
 546             snprintf(dinfo->id, 32, "%s%s%i",
 547                      if_name[type], mediastr, unit_id);
 548     }
 549     dinfo->bdrv = bdrv_new(dinfo->id);
 550     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 551     dinfo->bdrv->read_only = ro;
 552     dinfo->devaddr = devaddr;
 553     dinfo->type = type;
 554     dinfo->bus = bus_id;
 555     dinfo->unit = unit_id;
 556     dinfo->cyls = cyls;
 557     dinfo->heads = heads;
 558     dinfo->secs = secs;
 559     dinfo->trans = translation;
 560     dinfo->opts = opts;
 561     dinfo->refcount = 1;
 562     dinfo->serial = serial;
 563     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 564
 565     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 566
 567     /* disk I/O throttling */
 568     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 569
 570     switch(type) {
 571     case IF_IDE:
 572     case IF_SCSI:
 573     case IF_XEN:
 574     case IF_NONE:
 575         dinfo->media_cd = media == MEDIA_CDROM;
 576         break;
 577     case IF_SD:
 578     case IF_FLOPPY:
 579     case IF_PFLASH:
 580     case IF_MTD:
 581         break;
 582     case IF_VIRTIO:
 583         /* add virtio block device */
 584         opts = qemu_opts_create_nofail(qemu_find_opts("device"));
 585         if (arch_type == QEMU_ARCH_S390X) {
 586             qemu_opt_set(opts, "driver", "virtio-blk-s390");
 587         } else {
 588             qemu_opt_set(opts, "driver", "virtio-blk-pci");
 589         }
 590         qemu_opt_set(opts, "drive", dinfo->id);
 591         if (devaddr)
 592             qemu_opt_set(opts, "addr", devaddr);
 593         break;
 594     default:
 595         abort();
 596     }
 597     if (!file || !*file) {
 598         return dinfo;
 599     }
 600     if (snapshot) {
 601         /* always use cache=unsafe with snapshot */
 602         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 603         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 604     }
 605
 606     if (copy_on_read) {
 607         bdrv_flags |= BDRV_O_COPY_ON_READ;
 608     }
 609
 610     if (runstate_check(RUN_STATE_INMIGRATE)) {
 611         bdrv_flags |= BDRV_O_INCOMING;
 612     }
 613
 614     if (media == MEDIA_CDROM) {
 615         /* CDROM is fine for any interface, don't check.  */
 616         ro = 1;
 617     } else if (ro == 1) {
 618         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 619             type != IF_NONE && type != IF_PFLASH) {
 620             error_report("readonly not supported by this bus type");
 621             goto err;
 622         }
 623     }
 624
 625     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 626
 627     if (ro && copy_on_read) {
 628         error_report("warning: disabling copy_on_read on readonly drive");
 629     }
 630
 631     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 632     if (ret < 0) {
 633         if (ret == -EMEDIUMTYPE) {
 634             error_report("could not open disk image %s: not in %s format",
 635                          file, drv->format_name);
 636         } else {
 637             error_report("could not open disk image %s: %s",
 638                          file, strerror(-ret));
 639         }
 640         goto err;
 641     }
 642
 643     if (bdrv_key_required(dinfo->bdrv))
 644         autostart = 0;
 645     return dinfo;
 646
 647 err:
 648     bdrv_delete(dinfo->bdrv);
 649     g_free(dinfo->id);
 650     QTAILQ_REMOVE(&drives, dinfo, next);
 651     g_free(dinfo);
 652     return NULL;
 653 }
 654
 655 void do_commit(Monitor *mon, const QDict *qdict)
 656 {
 657     const char *device = qdict_get_str(qdict, "device");
 658     BlockDriverState *bs;
 659     int ret;
 660
 661     if (!strcmp(device, "all")) {
 662         ret = bdrv_commit_all();
 663     } else {
 664         bs = bdrv_find(device);
 665         if (!bs) {
 666             monitor_printf(mon, "Device '%s' not found\n", device);
 667             return;
 668         }
 669         ret = bdrv_commit(bs);
 670     }
 671     if (ret < 0) {
 672         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 673                        strerror(-ret));
 674     }
 675 }
 676
 677 static void blockdev_do_action(int kind, void *data, Error **errp)
 678 {
 679     BlockdevAction action;
 680     BlockdevActionList list;
 681
 682     action.kind = kind;
 683     action.data = data;
 684     list.value = &action;
 685     list.next = NULL;
 686     qmp_transaction(&list, errp);
 687 }
 688
 689 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 690                                 bool has_format, const char *format,
 691                                 bool has_mode, enum NewImageMode mode,
 692                                 Error **errp)
 693 {
 694     BlockdevSnapshot snapshot = {
 695         .device = (char *) device,
 696         .snapshot_file = (char *) snapshot_file,
 697         .has_format = has_format,
 698         .format = (char *) format,
 699         .has_mode = has_mode,
 700         .mode = mode,
 701     };
 702     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 703                        errp);
 704 }
 705
 706
 707 /* New and old BlockDriverState structs for group snapshots */
 708 typedef struct BlkTransactionStates {
 709     BlockDriverState *old_bs;
 710     BlockDriverState *new_bs;
 711     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 712 } BlkTransactionStates;
 713
 714 /*
 715  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 716  *  then we do not pivot any of the devices in the group, and abandon the
 717  *  snapshots
 718  */
 719 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 720 {
 721     int ret = 0;
 722     BlockdevActionList *dev_entry = dev_list;
 723     BlkTransactionStates *states, *next;
 724     Error *local_err = NULL;
 725
 726     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 727     QSIMPLEQ_INIT(&snap_bdrv_states);
 728
 729     /* drain all i/o before any snapshots */
 730     bdrv_drain_all();
 731
 732     /* We don't do anything in this loop that commits us to the snapshot */
 733     while (NULL != dev_entry) {
 734         BlockdevAction *dev_info = NULL;
 735         BlockDriver *proto_drv;
 736         BlockDriver *drv;
 737         int flags;
 738         enum NewImageMode mode;
 739         const char *new_image_file;
 740         const char *device;
 741         const char *format = "qcow2";
 742
 743         dev_info = dev_entry->value;
 744         dev_entry = dev_entry->next;
 745
 746         states = g_malloc0(sizeof(BlkTransactionStates));
 747         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 748
 749         switch (dev_info->kind) {
 750         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 751             device = dev_info->blockdev_snapshot_sync->device;
 752             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 753                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 754             }
 755             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 756             if (dev_info->blockdev_snapshot_sync->has_format) {
 757                 format = dev_info->blockdev_snapshot_sync->format;
 758             }
 759             mode = dev_info->blockdev_snapshot_sync->mode;
 760             break;
 761         default:
 762             abort();
 763         }
 764
 765         drv = bdrv_find_format(format);
 766         if (!drv) {
 767             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 768             goto delete_and_fail;
 769         }
 770
 771         states->old_bs = bdrv_find(device);
 772         if (!states->old_bs) {
 773             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 774             goto delete_and_fail;
 775         }
 776
 777         if (!bdrv_is_inserted(states->old_bs)) {
 778             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 779             goto delete_and_fail;
 780         }
 781
 782         if (bdrv_in_use(states->old_bs)) {
 783             error_set(errp, QERR_DEVICE_IN_USE, device);
 784             goto delete_and_fail;
 785         }
 786
 787         if (!bdrv_is_read_only(states->old_bs)) {
 788             if (bdrv_flush(states->old_bs)) {
 789                 error_set(errp, QERR_IO_ERROR);
 790                 goto delete_and_fail;
 791             }
 792         }
 793
 794         flags = states->old_bs->open_flags;
 795
 796         proto_drv = bdrv_find_protocol(new_image_file);
 797         if (!proto_drv) {
 798             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 799             goto delete_and_fail;
 800         }
 801
 802         /* create new image w/backing file */
 803         if (mode != NEW_IMAGE_MODE_EXISTING) {
 804             bdrv_img_create(new_image_file, format,
 805                             states->old_bs->filename,
 806                             states->old_bs->drv->format_name,
 807                             NULL, -1, flags, &local_err, false);
 808             if (error_is_set(&local_err)) {
 809                 error_propagate(errp, local_err);
 810                 goto delete_and_fail;
 811             }
 812         }
 813
 814         /* We will manually add the backing_hd field to the bs later */
 815         states->new_bs = bdrv_new("");
 816         ret = bdrv_open(states->new_bs, new_image_file,
 817                         flags | BDRV_O_NO_BACKING, drv);
 818         if (ret != 0) {
 819             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 820             goto delete_and_fail;
 821         }
 822     }
 823
 824
 825     /* Now we are going to do the actual pivot.  Everything up to this point
 826      * is reversible, but we are committed at this point */
 827     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 828         /* This removes our old bs from the bdrv_states, and adds the new bs */
 829         bdrv_append(states->new_bs, states->old_bs);
 830         /* We don't need (or want) to use the transactional
 831          * bdrv_reopen_multiple() across all the entries at once, because we
 832          * don't want to abort all of them if one of them fails the reopen */
 833         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 834                     NULL);
 835     }
 836
 837     /* success */
 838     goto exit;
 839
 840 delete_and_fail:
 841     /*
 842     * failure, and it is all-or-none; abandon each new bs, and keep using
 843     * the original bs for all images
 844     */
 845     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 846         if (states->new_bs) {
 847              bdrv_delete(states->new_bs);
 848         }
 849     }
 850 exit:
 851     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 852         g_free(states);
 853     }
 854 }
 855
 856
 857 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 858 {
 859     if (bdrv_in_use(bs)) {
 860         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 861         return;
 862     }
 863     if (!bdrv_dev_has_removable_media(bs)) {
 864         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 865         return;
 866     }
 867
 868     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 869         bdrv_dev_eject_request(bs, force);
 870         if (!force) {
 871             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 872             return;
 873         }
 874     }
 875
 876     bdrv_close(bs);
 877 }
 878
 879 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 880 {
 881     BlockDriverState *bs;
 882
 883     bs = bdrv_find(device);
 884     if (!bs) {
 885         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 886         return;
 887     }
 888
 889     eject_device(bs, force, errp);
 890 }
 891
 892 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 893 {
 894     BlockDriverState *bs;
 895     int err;
 896
 897     bs = bdrv_find(device);
 898     if (!bs) {
 899         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 900         return;
 901     }
 902
 903     err = bdrv_set_key(bs, password);
 904     if (err == -EINVAL) {
 905         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 906         return;
 907     } else if (err < 0) {
 908         error_set(errp, QERR_INVALID_PASSWORD);
 909         return;
 910     }
 911 }
 912
 913 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 914                                     int bdrv_flags, BlockDriver *drv,
 915                                     const char *password, Error **errp)
 916 {
 917     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 918         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 919         return;
 920     }
 921
 922     if (bdrv_key_required(bs)) {
 923         if (password) {
 924             if (bdrv_set_key(bs, password) < 0) {
 925                 error_set(errp, QERR_INVALID_PASSWORD);
 926             }
 927         } else {
 928             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 929                       bdrv_get_encrypted_filename(bs));
 930         }
 931     } else if (password) {
 932         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 933     }
 934 }
 935
 936 void qmp_change_blockdev(const char *device, const char *filename,
 937                          bool has_format, const char *format, Error **errp)
 938 {
 939     BlockDriverState *bs;
 940     BlockDriver *drv = NULL;
 941     int bdrv_flags;
 942     Error *err = NULL;
 943
 944     bs = bdrv_find(device);
 945     if (!bs) {
 946         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 947         return;
 948     }
 949
 950     if (format) {
 951         drv = bdrv_find_whitelisted_format(format);
 952         if (!drv) {
 953             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 954             return;
 955         }
 956     }
 957
 958     eject_device(bs, 0, &err);
 959     if (error_is_set(&err)) {
 960         error_propagate(errp, err);
 961         return;
 962     }
 963
 964     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 965     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 966
 967     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 968 }
 969
 970 /* throttling disk I/O limits */
 971 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 972                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 973                                int64_t iops_wr, Error **errp)
 974 {
 975     BlockIOLimit io_limits;
 976     BlockDriverState *bs;
 977
 978     bs = bdrv_find(device);
 979     if (!bs) {
 980         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 981         return;
 982     }
 983
 984     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 985     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 986     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 987     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 988     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 989     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 990
 991     if (!do_check_io_limits(&io_limits, errp)) {
 992         return;
 993     }
 994
 995     bs->io_limits = io_limits;
 996     bs->slice_time = BLOCK_IO_SLICE_TIME;
 997
 998     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 999         bdrv_io_limits_enable(bs);
1000     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
1001         bdrv_io_limits_disable(bs);
1002     } else {
1003         if (bs->block_timer) {
1004             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
1005         }
1006     }
1007 }
1008
1009 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1010 {
1011     const char *id = qdict_get_str(qdict, "id");
1012     BlockDriverState *bs;
1013
1014     bs = bdrv_find(id);
1015     if (!bs) {
1016         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1017         return -1;
1018     }
1019     if (bdrv_in_use(bs)) {
1020         qerror_report(QERR_DEVICE_IN_USE, id);
1021         return -1;
1022     }
1023
1024     /* quiesce block driver; prevent further io */
1025     bdrv_drain_all();
1026     bdrv_flush(bs);
1027     bdrv_close(bs);
1028
1029     /* if we have a device attached to this BlockDriverState
1030      * then we need to make the drive anonymous until the device
1031      * can be removed.  If this is a drive with no device backing
1032      * then we can just get rid of the block driver state right here.
1033      */
1034     if (bdrv_get_attached_dev(bs)) {
1035         bdrv_make_anon(bs);
1036     } else {
1037         drive_uninit(drive_get_by_blockdev(bs));
1038     }
1039
1040     return 0;
1041 }
1042
1043 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1044 {
1045     BlockDriverState *bs;
1046
1047     bs = bdrv_find(device);
1048     if (!bs) {
1049         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1050         return;
1051     }
1052
1053     if (size < 0) {
1054         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1055         return;
1056     }
1057
1058     switch (bdrv_truncate(bs, size)) {
1059     case 0:
1060         break;
1061     case -ENOMEDIUM:
1062         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1063         break;
1064     case -ENOTSUP:
1065         error_set(errp, QERR_UNSUPPORTED);
1066         break;
1067     case -EACCES:
1068         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1069         break;
1070     case -EBUSY:
1071         error_set(errp, QERR_DEVICE_IN_USE, device);
1072         break;
1073     default:
1074         error_set(errp, QERR_UNDEFINED_ERROR);
1075         break;
1076     }
1077 }
1078
1079 static void block_job_cb(void *opaque, int ret)
1080 {
1081     BlockDriverState *bs = opaque;
1082     QObject *obj;
1083
1084     trace_block_job_cb(bs, bs->job, ret);
1085
1086     assert(bs->job);
1087     obj = qobject_from_block_job(bs->job);
1088     if (ret < 0) {
1089         QDict *dict = qobject_to_qdict(obj);
1090         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1091     }
1092
1093     if (block_job_is_cancelled(bs->job)) {
1094         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1095     } else {
1096         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1097     }
1098     qobject_decref(obj);
1099
1100     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1101 }
1102
1103 void qmp_block_stream(const char *device, bool has_base,
1104                       const char *base, bool has_speed, int64_t speed,
1105                       bool has_on_error, BlockdevOnError on_error,
1106                       Error **errp)
1107 {
1108     BlockDriverState *bs;
1109     BlockDriverState *base_bs = NULL;
1110     Error *local_err = NULL;
1111
1112     if (!has_on_error) {
1113         on_error = BLOCKDEV_ON_ERROR_REPORT;
1114     }
1115
1116     bs = bdrv_find(device);
1117     if (!bs) {
1118         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1119         return;
1120     }
1121
1122     if (base) {
1123         base_bs = bdrv_find_backing_image(bs, base);
1124         if (base_bs == NULL) {
1125             error_set(errp, QERR_BASE_NOT_FOUND, base);
1126             return;
1127         }
1128     }
1129
1130     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1131                  on_error, block_job_cb, bs, &local_err);
1132     if (error_is_set(&local_err)) {
1133         error_propagate(errp, local_err);
1134         return;
1135     }
1136
1137     /* Grab a reference so hotplug does not delete the BlockDriverState from
1138      * underneath us.
1139      */
1140     drive_get_ref(drive_get_by_blockdev(bs));
1141
1142     trace_qmp_block_stream(bs, bs->job);
1143 }
1144
1145 void qmp_block_commit(const char *device,
1146                       bool has_base, const char *base, const char *top,
1147                       bool has_speed, int64_t speed,
1148                       Error **errp)
1149 {
1150     BlockDriverState *bs;
1151     BlockDriverState *base_bs, *top_bs;
1152     Error *local_err = NULL;
1153     /* This will be part of the QMP command, if/when the
1154      * BlockdevOnError change for blkmirror makes it in
1155      */
1156     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1157
1158     /* drain all i/o before commits */
1159     bdrv_drain_all();
1160
1161     bs = bdrv_find(device);
1162     if (!bs) {
1163         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1164         return;
1165     }
1166
1167     /* default top_bs is the active layer */
1168     top_bs = bs;
1169
1170     if (top) {
1171         if (strcmp(bs->filename, top) != 0) {
1172             top_bs = bdrv_find_backing_image(bs, top);
1173         }
1174     }
1175
1176     if (top_bs == NULL) {
1177         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1178         return;
1179     }
1180
1181     if (has_base && base) {
1182         base_bs = bdrv_find_backing_image(top_bs, base);
1183     } else {
1184         base_bs = bdrv_find_base(top_bs);
1185     }
1186
1187     if (base_bs == NULL) {
1188         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1189         return;
1190     }
1191
1192     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1193                 &local_err);
1194     if (local_err != NULL) {
1195         error_propagate(errp, local_err);
1196         return;
1197     }
1198     /* Grab a reference so hotplug does not delete the BlockDriverState from
1199      * underneath us.
1200      */
1201     drive_get_ref(drive_get_by_blockdev(bs));
1202 }
1203
1204 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1205
1206 void qmp_drive_mirror(const char *device, const char *target,
1207                       bool has_format, const char *format,
1208                       enum MirrorSyncMode sync,
1209                       bool has_mode, enum NewImageMode mode,
1210                       bool has_speed, int64_t speed,
1211                       bool has_granularity, uint32_t granularity,
1212                       bool has_buf_size, int64_t buf_size,
1213                       bool has_on_source_error, BlockdevOnError on_source_error,
1214                       bool has_on_target_error, BlockdevOnError on_target_error,
1215                       Error **errp)
1216 {
1217     BlockDriverState *bs;
1218     BlockDriverState *source, *target_bs;
1219     BlockDriver *proto_drv;
1220     BlockDriver *drv = NULL;
1221     Error *local_err = NULL;
1222     int flags;
1223     uint64_t size;
1224     int ret;
1225
1226     if (!has_speed) {
1227         speed = 0;
1228     }
1229     if (!has_on_source_error) {
1230         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1231     }
1232     if (!has_on_target_error) {
1233         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1234     }
1235     if (!has_mode) {
1236         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1237     }
1238     if (!has_granularity) {
1239         granularity = 0;
1240     }
1241     if (!has_buf_size) {
1242         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1243     }
1244
1245     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1246         error_set(errp, QERR_INVALID_PARAMETER, device);
1247         return;
1248     }
1249     if (granularity & (granularity - 1)) {
1250         error_set(errp, QERR_INVALID_PARAMETER, device);
1251         return;
1252     }
1253
1254     bs = bdrv_find(device);
1255     if (!bs) {
1256         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1257         return;
1258     }
1259
1260     if (!bdrv_is_inserted(bs)) {
1261         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1262         return;
1263     }
1264
1265     if (!has_format) {
1266         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1267     }
1268     if (format) {
1269         drv = bdrv_find_format(format);
1270         if (!drv) {
1271             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1272             return;
1273         }
1274     }
1275
1276     if (bdrv_in_use(bs)) {
1277         error_set(errp, QERR_DEVICE_IN_USE, device);
1278         return;
1279     }
1280
1281     flags = bs->open_flags | BDRV_O_RDWR;
1282     source = bs->backing_hd;
1283     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1284         sync = MIRROR_SYNC_MODE_FULL;
1285     }
1286
1287     proto_drv = bdrv_find_protocol(target);
1288     if (!proto_drv) {
1289         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1290         return;
1291     }
1292
1293     bdrv_get_geometry(bs, &size);
1294     size *= 512;
1295     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1296         /* create new image w/o backing file */
1297         assert(format && drv);
1298         bdrv_img_create(target, format,
1299                         NULL, NULL, NULL, size, flags, &local_err, false);
1300     } else {
1301         switch (mode) {
1302         case NEW_IMAGE_MODE_EXISTING:
1303             ret = 0;
1304             break;
1305         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1306             /* create new image with backing file */
1307             bdrv_img_create(target, format,
1308                             source->filename,
1309                             source->drv->format_name,
1310                             NULL, size, flags, &local_err, false);
1311             break;
1312         default:
1313             abort();
1314         }
1315     }
1316
1317     if (error_is_set(&local_err)) {
1318         error_propagate(errp, local_err);
1319         return;
1320     }
1321
1322     /* Mirroring takes care of copy-on-write using the source's backing
1323      * file.
1324      */
1325     target_bs = bdrv_new("");
1326     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1327
1328     if (ret < 0) {
1329         bdrv_delete(target_bs);
1330         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1331         return;
1332     }
1333
1334     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1335                  on_source_error, on_target_error,
1336                  block_job_cb, bs, &local_err);
1337     if (local_err != NULL) {
1338         bdrv_delete(target_bs);
1339         error_propagate(errp, local_err);
1340         return;
1341     }
1342
1343     /* Grab a reference so hotplug does not delete the BlockDriverState from
1344      * underneath us.
1345      */
1346     drive_get_ref(drive_get_by_blockdev(bs));
1347 }
1348
1349 static BlockJob *find_block_job(const char *device)
1350 {
1351     BlockDriverState *bs;
1352
1353     bs = bdrv_find(device);
1354     if (!bs || !bs->job) {
1355         return NULL;
1356     }
1357     return bs->job;
1358 }
1359
1360 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1361 {
1362     BlockJob *job = find_block_job(device);
1363
1364     if (!job) {
1365         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1366         return;
1367     }
1368
1369     block_job_set_speed(job, speed, errp);
1370 }
1371
1372 void qmp_block_job_cancel(const char *device,
1373                           bool has_force, bool force, Error **errp)
1374 {
1375     BlockJob *job = find_block_job(device);
1376
1377     if (!has_force) {
1378         force = false;
1379     }
1380
1381     if (!job) {
1382         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1383         return;
1384     }
1385     if (job->paused && !force) {
1386         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1387         return;
1388     }
1389
1390     trace_qmp_block_job_cancel(job);
1391     block_job_cancel(job);
1392 }
1393
1394 void qmp_block_job_pause(const char *device, Error **errp)
1395 {
1396     BlockJob *job = find_block_job(device);
1397
1398     if (!job) {
1399         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1400         return;
1401     }
1402
1403     trace_qmp_block_job_pause(job);
1404     block_job_pause(job);
1405 }
1406
1407 void qmp_block_job_resume(const char *device, Error **errp)
1408 {
1409     BlockJob *job = find_block_job(device);
1410
1411     if (!job) {
1412         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1413         return;
1414     }
1415
1416     trace_qmp_block_job_resume(job);
1417     block_job_resume(job);
1418 }
1419
1420 void qmp_block_job_complete(const char *device, Error **errp)
1421 {
1422     BlockJob *job = find_block_job(device);
1423
1424     if (!job) {
1425         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1426         return;
1427     }
1428
1429     trace_qmp_block_job_complete(job);
1430     block_job_complete(job, errp);
1431 }
1432
1433 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1434 {
1435     BlockJobInfoList **prev = opaque;
1436     BlockJob *job = bs->job;
1437
1438     if (job) {
1439         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1440         elem->value = block_job_query(bs->job);
1441         (*prev)->next = elem;
1442         *prev = elem;
1443     }
1444 }
1445
1446 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1447 {
1448     /* Dummy is a fake list element for holding the head pointer */
1449     BlockJobInfoList dummy = {};
1450     BlockJobInfoList *prev = &dummy;
1451     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1452     return dummy.next;
1453 }
1454
1455 QemuOptsList qemu_drive_opts = {
1456     .name = "drive",
1457     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1458     .desc = {
1459         {
1460             .name = "bus",
1461             .type = QEMU_OPT_NUMBER,
1462             .help = "bus number",
1463         },{
1464             .name = "unit",
1465             .type = QEMU_OPT_NUMBER,
1466             .help = "unit number (i.e. lun for scsi)",
1467         },{
1468             .name = "if",
1469             .type = QEMU_OPT_STRING,
1470             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1471         },{
1472             .name = "index",
1473             .type = QEMU_OPT_NUMBER,
1474             .help = "index number",
1475         },{
1476             .name = "cyls",
1477             .type = QEMU_OPT_NUMBER,
1478             .help = "number of cylinders (ide disk geometry)",
1479         },{
1480             .name = "heads",
1481             .type = QEMU_OPT_NUMBER,
1482             .help = "number of heads (ide disk geometry)",
1483         },{
1484             .name = "secs",
1485             .type = QEMU_OPT_NUMBER,
1486             .help = "number of sectors (ide disk geometry)",
1487         },{
1488             .name = "trans",
1489             .type = QEMU_OPT_STRING,
1490             .help = "chs translation (auto, lba. none)",
1491         },{
1492             .name = "media",
1493             .type = QEMU_OPT_STRING,
1494             .help = "media type (disk, cdrom)",
1495         },{
1496             .name = "snapshot",
1497             .type = QEMU_OPT_BOOL,
1498             .help = "enable/disable snapshot mode",
1499         },{
1500             .name = "file",
1501             .type = QEMU_OPT_STRING,
1502             .help = "disk image",
1503         },{
1504             .name = "cache",
1505             .type = QEMU_OPT_STRING,
1506             .help = "host cache usage (none, writeback, writethrough, "
1507                     "directsync, unsafe)",
1508         },{
1509             .name = "aio",
1510             .type = QEMU_OPT_STRING,
1511             .help = "host AIO implementation (threads, native)",
1512         },{
1513             .name = "format",
1514             .type = QEMU_OPT_STRING,
1515             .help = "disk format (raw, qcow2, ...)",
1516         },{
1517             .name = "serial",
1518             .type = QEMU_OPT_STRING,
1519             .help = "disk serial number",
1520         },{
1521             .name = "rerror",
1522             .type = QEMU_OPT_STRING,
1523             .help = "read error action",
1524         },{
1525             .name = "werror",
1526             .type = QEMU_OPT_STRING,
1527             .help = "write error action",
1528         },{
1529             .name = "addr",
1530             .type = QEMU_OPT_STRING,
1531             .help = "pci address (virtio only)",
1532         },{
1533             .name = "readonly",
1534             .type = QEMU_OPT_BOOL,
1535             .help = "open drive file as read-only",
1536         },{
1537             .name = "iops",
1538             .type = QEMU_OPT_NUMBER,
1539             .help = "limit total I/O operations per second",
1540         },{
1541             .name = "iops_rd",
1542             .type = QEMU_OPT_NUMBER,
1543             .help = "limit read operations per second",
1544         },{
1545             .name = "iops_wr",
1546             .type = QEMU_OPT_NUMBER,
1547             .help = "limit write operations per second",
1548         },{
1549             .name = "bps",
1550             .type = QEMU_OPT_NUMBER,
1551             .help = "limit total bytes per second",
1552         },{
1553             .name = "bps_rd",
1554             .type = QEMU_OPT_NUMBER,
1555             .help = "limit read bytes per second",
1556         },{
1557             .name = "bps_wr",
1558             .type = QEMU_OPT_NUMBER,
1559             .help = "limit write bytes per second",
1560         },{
1561             .name = "copy-on-read",
1562             .type = QEMU_OPT_BOOL,
1563             .help = "copy read data from backing file into image file",
1564         },{
1565             .name = "boot",
1566             .type = QEMU_OPT_BOOL,
1567             .help = "(deprecated, ignored)",
1568         },
1569         { /* end of list */ }
1570     },
1571 };