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 "blockdev.h"
  11 #include "hw/block-common.h"
  12 #include "blockjob.h"
  13 #include "monitor.h"
  14 #include "qerror.h"
  15 #include "qemu-option.h"
  16 #include "qemu-config.h"
  17 #include "qemu-objects.h"
  18 #include "sysemu.h"
  19 #include "block_int.h"
  20 #include "qmp-commands.h"
  21 #include "trace.h"
  22 #include "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)
 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         return false;
 273     }
 274
 275     return true;
 276 }
 277
 278 DriveInfo *drive_init(QemuOpts *opts, BlockInterfaceType block_default_type)
 279 {
 280     const char *buf;
 281     const char *file = NULL;
 282     const char *serial;
 283     const char *mediastr = "";
 284     BlockInterfaceType type;
 285     enum { MEDIA_DISK, MEDIA_CDROM } media;
 286     int bus_id, unit_id;
 287     int cyls, heads, secs, translation;
 288     BlockDriver *drv = NULL;
 289     int max_devs;
 290     int index;
 291     int ro = 0;
 292     int bdrv_flags = 0;
 293     int on_read_error, on_write_error;
 294     const char *devaddr;
 295     DriveInfo *dinfo;
 296     BlockIOLimit io_limits;
 297     int snapshot = 0;
 298     bool copy_on_read;
 299     int ret;
 300
 301     translation = BIOS_ATA_TRANSLATION_AUTO;
 302     media = MEDIA_DISK;
 303
 304     /* extract parameters */
 305     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 306     unit_id = qemu_opt_get_number(opts, "unit", -1);
 307     index   = qemu_opt_get_number(opts, "index", -1);
 308
 309     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 310     heads = qemu_opt_get_number(opts, "heads", 0);
 311     secs  = qemu_opt_get_number(opts, "secs", 0);
 312
 313     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 314     ro = qemu_opt_get_bool(opts, "readonly", 0);
 315     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 316
 317     file = qemu_opt_get(opts, "file");
 318     serial = qemu_opt_get(opts, "serial");
 319
 320     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 321         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 322             ;
 323         if (type == IF_COUNT) {
 324             error_report("unsupported bus type '%s'", buf);
 325             return NULL;
 326         }
 327     } else {
 328         type = block_default_type;
 329     }
 330
 331     max_devs = if_max_devs[type];
 332
 333     if (cyls || heads || secs) {
 334         if (cyls < 1) {
 335             error_report("invalid physical cyls number");
 336             return NULL;
 337         }
 338         if (heads < 1) {
 339             error_report("invalid physical heads number");
 340             return NULL;
 341         }
 342         if (secs < 1) {
 343             error_report("invalid physical secs number");
 344             return NULL;
 345         }
 346     }
 347
 348     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 349         if (!cyls) {
 350             error_report("'%s' trans must be used with cyls, heads and secs",
 351                          buf);
 352             return NULL;
 353         }
 354         if (!strcmp(buf, "none"))
 355             translation = BIOS_ATA_TRANSLATION_NONE;
 356         else if (!strcmp(buf, "lba"))
 357             translation = BIOS_ATA_TRANSLATION_LBA;
 358         else if (!strcmp(buf, "auto"))
 359             translation = BIOS_ATA_TRANSLATION_AUTO;
 360         else {
 361             error_report("'%s' invalid translation type", buf);
 362             return NULL;
 363         }
 364     }
 365
 366     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 367         if (!strcmp(buf, "disk")) {
 368             media = MEDIA_DISK;
 369         } else if (!strcmp(buf, "cdrom")) {
 370             if (cyls || secs || heads) {
 371                 error_report("CHS can't be set with media=%s", buf);
 372                 return NULL;
 373             }
 374             media = MEDIA_CDROM;
 375         } else {
 376             error_report("'%s' invalid media", buf);
 377             return NULL;
 378         }
 379     }
 380
 381     bdrv_flags |= BDRV_O_CACHE_WB;
 382     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 383         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 384             error_report("invalid cache option");
 385             return NULL;
 386         }
 387     }
 388
 389 #ifdef CONFIG_LINUX_AIO
 390     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 391         if (!strcmp(buf, "native")) {
 392             bdrv_flags |= BDRV_O_NATIVE_AIO;
 393         } else if (!strcmp(buf, "threads")) {
 394             /* this is the default */
 395         } else {
 396            error_report("invalid aio option");
 397            return NULL;
 398         }
 399     }
 400 #endif
 401
 402     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 403         if (is_help_option(buf)) {
 404             error_printf("Supported formats:");
 405             bdrv_iterate_format(bdrv_format_print, NULL);
 406             error_printf("\n");
 407             return NULL;
 408         }
 409         drv = bdrv_find_whitelisted_format(buf);
 410         if (!drv) {
 411             error_report("'%s' invalid format", buf);
 412             return NULL;
 413         }
 414     }
 415
 416     /* disk I/O throttling */
 417     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 418                            qemu_opt_get_number(opts, "bps", 0);
 419     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 420                            qemu_opt_get_number(opts, "bps_rd", 0);
 421     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 422                            qemu_opt_get_number(opts, "bps_wr", 0);
 423     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 424                            qemu_opt_get_number(opts, "iops", 0);
 425     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 426                            qemu_opt_get_number(opts, "iops_rd", 0);
 427     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 428                            qemu_opt_get_number(opts, "iops_wr", 0);
 429
 430     if (!do_check_io_limits(&io_limits)) {
 431         error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 432                      "cannot be used at the same time");
 433         return NULL;
 434     }
 435
 436     if (qemu_opt_get(opts, "boot") != NULL) {
 437         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 438                 "ignored. Future versions will reject this parameter. Please "
 439                 "update your scripts.\n");
 440     }
 441
 442     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 443     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 444         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 445             error_report("werror is not supported by this bus type");
 446             return NULL;
 447         }
 448
 449         on_write_error = parse_block_error_action(buf, 0);
 450         if (on_write_error < 0) {
 451             return NULL;
 452         }
 453     }
 454
 455     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 456     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 457         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 458             error_report("rerror is not supported by this bus type");
 459             return NULL;
 460         }
 461
 462         on_read_error = parse_block_error_action(buf, 1);
 463         if (on_read_error < 0) {
 464             return NULL;
 465         }
 466     }
 467
 468     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 469         if (type != IF_VIRTIO) {
 470             error_report("addr is not supported by this bus type");
 471             return NULL;
 472         }
 473     }
 474
 475     /* compute bus and unit according index */
 476
 477     if (index != -1) {
 478         if (bus_id != 0 || unit_id != -1) {
 479             error_report("index cannot be used with bus and unit");
 480             return NULL;
 481         }
 482         bus_id = drive_index_to_bus_id(type, index);
 483         unit_id = drive_index_to_unit_id(type, index);
 484     }
 485
 486     /* if user doesn't specify a unit_id,
 487      * try to find the first free
 488      */
 489
 490     if (unit_id == -1) {
 491        unit_id = 0;
 492        while (drive_get(type, bus_id, unit_id) != NULL) {
 493            unit_id++;
 494            if (max_devs && unit_id >= max_devs) {
 495                unit_id -= max_devs;
 496                bus_id++;
 497            }
 498        }
 499     }
 500
 501     /* check unit id */
 502
 503     if (max_devs && unit_id >= max_devs) {
 504         error_report("unit %d too big (max is %d)",
 505                      unit_id, max_devs - 1);
 506         return NULL;
 507     }
 508
 509     /*
 510      * catch multiple definitions
 511      */
 512
 513     if (drive_get(type, bus_id, unit_id) != NULL) {
 514         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 515                      bus_id, unit_id, index);
 516         return NULL;
 517     }
 518
 519     /* init */
 520
 521     dinfo = g_malloc0(sizeof(*dinfo));
 522     if ((buf = qemu_opts_id(opts)) != NULL) {
 523         dinfo->id = g_strdup(buf);
 524     } else {
 525         /* no id supplied -> create one */
 526         dinfo->id = g_malloc0(32);
 527         if (type == IF_IDE || type == IF_SCSI)
 528             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 529         if (max_devs)
 530             snprintf(dinfo->id, 32, "%s%i%s%i",
 531                      if_name[type], bus_id, mediastr, unit_id);
 532         else
 533             snprintf(dinfo->id, 32, "%s%s%i",
 534                      if_name[type], mediastr, unit_id);
 535     }
 536     dinfo->bdrv = bdrv_new(dinfo->id);
 537     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 538     dinfo->bdrv->read_only = ro;
 539     dinfo->devaddr = devaddr;
 540     dinfo->type = type;
 541     dinfo->bus = bus_id;
 542     dinfo->unit = unit_id;
 543     dinfo->cyls = cyls;
 544     dinfo->heads = heads;
 545     dinfo->secs = secs;
 546     dinfo->trans = translation;
 547     dinfo->opts = opts;
 548     dinfo->refcount = 1;
 549     dinfo->serial = serial;
 550     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 551
 552     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 553
 554     /* disk I/O throttling */
 555     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 556
 557     switch(type) {
 558     case IF_IDE:
 559     case IF_SCSI:
 560     case IF_XEN:
 561     case IF_NONE:
 562         dinfo->media_cd = media == MEDIA_CDROM;
 563         break;
 564     case IF_SD:
 565     case IF_FLOPPY:
 566     case IF_PFLASH:
 567     case IF_MTD:
 568         break;
 569     case IF_VIRTIO:
 570         /* add virtio block device */
 571         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL);
 572         if (arch_type == QEMU_ARCH_S390X) {
 573             qemu_opt_set(opts, "driver", "virtio-blk-s390");
 574         } else {
 575             qemu_opt_set(opts, "driver", "virtio-blk-pci");
 576         }
 577         qemu_opt_set(opts, "drive", dinfo->id);
 578         if (devaddr)
 579             qemu_opt_set(opts, "addr", devaddr);
 580         break;
 581     default:
 582         abort();
 583     }
 584     if (!file || !*file) {
 585         return dinfo;
 586     }
 587     if (snapshot) {
 588         /* always use cache=unsafe with snapshot */
 589         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 590         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 591     }
 592
 593     if (copy_on_read) {
 594         bdrv_flags |= BDRV_O_COPY_ON_READ;
 595     }
 596
 597     if (runstate_check(RUN_STATE_INMIGRATE)) {
 598         bdrv_flags |= BDRV_O_INCOMING;
 599     }
 600
 601     if (media == MEDIA_CDROM) {
 602         /* CDROM is fine for any interface, don't check.  */
 603         ro = 1;
 604     } else if (ro == 1) {
 605         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 606             type != IF_NONE && type != IF_PFLASH) {
 607             error_report("readonly not supported by this bus type");
 608             goto err;
 609         }
 610     }
 611
 612     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 613
 614     if (ro && copy_on_read) {
 615         error_report("warning: disabling copy_on_read on readonly drive");
 616     }
 617
 618     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 619     if (ret < 0) {
 620         error_report("could not open disk image %s: %s",
 621                      file, strerror(-ret));
 622         goto err;
 623     }
 624
 625     if (bdrv_key_required(dinfo->bdrv))
 626         autostart = 0;
 627     return dinfo;
 628
 629 err:
 630     bdrv_delete(dinfo->bdrv);
 631     g_free(dinfo->id);
 632     QTAILQ_REMOVE(&drives, dinfo, next);
 633     g_free(dinfo);
 634     return NULL;
 635 }
 636
 637 void do_commit(Monitor *mon, const QDict *qdict)
 638 {
 639     const char *device = qdict_get_str(qdict, "device");
 640     BlockDriverState *bs;
 641     int ret;
 642
 643     if (!strcmp(device, "all")) {
 644         ret = bdrv_commit_all();
 645         if (ret == -EBUSY) {
 646             qerror_report(QERR_DEVICE_IN_USE, device);
 647             return;
 648         }
 649     } else {
 650         bs = bdrv_find(device);
 651         if (!bs) {
 652             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 653             return;
 654         }
 655         ret = bdrv_commit(bs);
 656         if (ret == -EBUSY) {
 657             qerror_report(QERR_DEVICE_IN_USE, device);
 658             return;
 659         }
 660     }
 661 }
 662
 663 static void blockdev_do_action(int kind, void *data, Error **errp)
 664 {
 665     BlockdevAction action;
 666     BlockdevActionList list;
 667
 668     action.kind = kind;
 669     action.data = data;
 670     list.value = &action;
 671     list.next = NULL;
 672     qmp_transaction(&list, errp);
 673 }
 674
 675 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 676                                 bool has_format, const char *format,
 677                                 bool has_mode, enum NewImageMode mode,
 678                                 Error **errp)
 679 {
 680     BlockdevSnapshot snapshot = {
 681         .device = (char *) device,
 682         .snapshot_file = (char *) snapshot_file,
 683         .has_format = has_format,
 684         .format = (char *) format,
 685         .has_mode = has_mode,
 686         .mode = mode,
 687     };
 688     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 689                        errp);
 690 }
 691
 692
 693 /* New and old BlockDriverState structs for group snapshots */
 694 typedef struct BlkTransactionStates {
 695     BlockDriverState *old_bs;
 696     BlockDriverState *new_bs;
 697     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 698 } BlkTransactionStates;
 699
 700 /*
 701  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 702  *  then we do not pivot any of the devices in the group, and abandon the
 703  *  snapshots
 704  */
 705 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 706 {
 707     int ret = 0;
 708     BlockdevActionList *dev_entry = dev_list;
 709     BlkTransactionStates *states, *next;
 710
 711     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 712     QSIMPLEQ_INIT(&snap_bdrv_states);
 713
 714     /* drain all i/o before any snapshots */
 715     bdrv_drain_all();
 716
 717     /* We don't do anything in this loop that commits us to the snapshot */
 718     while (NULL != dev_entry) {
 719         BlockdevAction *dev_info = NULL;
 720         BlockDriver *proto_drv;
 721         BlockDriver *drv;
 722         int flags;
 723         enum NewImageMode mode;
 724         const char *new_image_file;
 725         const char *device;
 726         const char *format = "qcow2";
 727
 728         dev_info = dev_entry->value;
 729         dev_entry = dev_entry->next;
 730
 731         states = g_malloc0(sizeof(BlkTransactionStates));
 732         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 733
 734         switch (dev_info->kind) {
 735         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 736             device = dev_info->blockdev_snapshot_sync->device;
 737             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 738                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 739             }
 740             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 741             if (dev_info->blockdev_snapshot_sync->has_format) {
 742                 format = dev_info->blockdev_snapshot_sync->format;
 743             }
 744             mode = dev_info->blockdev_snapshot_sync->mode;
 745             break;
 746         default:
 747             abort();
 748         }
 749
 750         drv = bdrv_find_format(format);
 751         if (!drv) {
 752             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 753             goto delete_and_fail;
 754         }
 755
 756         states->old_bs = bdrv_find(device);
 757         if (!states->old_bs) {
 758             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 759             goto delete_and_fail;
 760         }
 761
 762         if (!bdrv_is_inserted(states->old_bs)) {
 763             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 764             goto delete_and_fail;
 765         }
 766
 767         if (bdrv_in_use(states->old_bs)) {
 768             error_set(errp, QERR_DEVICE_IN_USE, device);
 769             goto delete_and_fail;
 770         }
 771
 772         if (!bdrv_is_read_only(states->old_bs)) {
 773             if (bdrv_flush(states->old_bs)) {
 774                 error_set(errp, QERR_IO_ERROR);
 775                 goto delete_and_fail;
 776             }
 777         }
 778
 779         flags = states->old_bs->open_flags;
 780
 781         proto_drv = bdrv_find_protocol(new_image_file);
 782         if (!proto_drv) {
 783             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 784             goto delete_and_fail;
 785         }
 786
 787         /* create new image w/backing file */
 788         if (mode != NEW_IMAGE_MODE_EXISTING) {
 789             ret = bdrv_img_create(new_image_file, format,
 790                                   states->old_bs->filename,
 791                                   states->old_bs->drv->format_name,
 792                                   NULL, -1, flags, NULL);
 793             if (ret) {
 794                 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 795                 goto delete_and_fail;
 796             }
 797         }
 798
 799         /* We will manually add the backing_hd field to the bs later */
 800         states->new_bs = bdrv_new("");
 801         ret = bdrv_open(states->new_bs, new_image_file,
 802                         flags | BDRV_O_NO_BACKING, drv);
 803         if (ret != 0) {
 804             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 805             goto delete_and_fail;
 806         }
 807     }
 808
 809
 810     /* Now we are going to do the actual pivot.  Everything up to this point
 811      * is reversible, but we are committed at this point */
 812     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 813         /* This removes our old bs from the bdrv_states, and adds the new bs */
 814         bdrv_append(states->new_bs, states->old_bs);
 815         /* We don't need (or want) to use the transactional
 816          * bdrv_reopen_multiple() across all the entries at once, because we
 817          * don't want to abort all of them if one of them fails the reopen */
 818         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 819                     NULL);
 820     }
 821
 822     /* success */
 823     goto exit;
 824
 825 delete_and_fail:
 826     /*
 827     * failure, and it is all-or-none; abandon each new bs, and keep using
 828     * the original bs for all images
 829     */
 830     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 831         if (states->new_bs) {
 832              bdrv_delete(states->new_bs);
 833         }
 834     }
 835 exit:
 836     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 837         g_free(states);
 838     }
 839 }
 840
 841
 842 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 843 {
 844     if (bdrv_in_use(bs)) {
 845         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 846         return;
 847     }
 848     if (!bdrv_dev_has_removable_media(bs)) {
 849         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 850         return;
 851     }
 852
 853     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 854         bdrv_dev_eject_request(bs, force);
 855         if (!force) {
 856             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 857             return;
 858         }
 859     }
 860
 861     bdrv_close(bs);
 862 }
 863
 864 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 865 {
 866     BlockDriverState *bs;
 867
 868     bs = bdrv_find(device);
 869     if (!bs) {
 870         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 871         return;
 872     }
 873
 874     eject_device(bs, force, errp);
 875 }
 876
 877 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 878 {
 879     BlockDriverState *bs;
 880     int err;
 881
 882     bs = bdrv_find(device);
 883     if (!bs) {
 884         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 885         return;
 886     }
 887
 888     err = bdrv_set_key(bs, password);
 889     if (err == -EINVAL) {
 890         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 891         return;
 892     } else if (err < 0) {
 893         error_set(errp, QERR_INVALID_PASSWORD);
 894         return;
 895     }
 896 }
 897
 898 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 899                                     int bdrv_flags, BlockDriver *drv,
 900                                     const char *password, Error **errp)
 901 {
 902     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 903         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 904         return;
 905     }
 906
 907     if (bdrv_key_required(bs)) {
 908         if (password) {
 909             if (bdrv_set_key(bs, password) < 0) {
 910                 error_set(errp, QERR_INVALID_PASSWORD);
 911             }
 912         } else {
 913             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 914                       bdrv_get_encrypted_filename(bs));
 915         }
 916     } else if (password) {
 917         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 918     }
 919 }
 920
 921 void qmp_change_blockdev(const char *device, const char *filename,
 922                          bool has_format, const char *format, Error **errp)
 923 {
 924     BlockDriverState *bs;
 925     BlockDriver *drv = NULL;
 926     int bdrv_flags;
 927     Error *err = NULL;
 928
 929     bs = bdrv_find(device);
 930     if (!bs) {
 931         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 932         return;
 933     }
 934
 935     if (format) {
 936         drv = bdrv_find_whitelisted_format(format);
 937         if (!drv) {
 938             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 939             return;
 940         }
 941     }
 942
 943     eject_device(bs, 0, &err);
 944     if (error_is_set(&err)) {
 945         error_propagate(errp, err);
 946         return;
 947     }
 948
 949     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 950     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 951
 952     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 953 }
 954
 955 /* throttling disk I/O limits */
 956 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 957                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 958                                int64_t iops_wr, Error **errp)
 959 {
 960     BlockIOLimit io_limits;
 961     BlockDriverState *bs;
 962
 963     bs = bdrv_find(device);
 964     if (!bs) {
 965         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 966         return;
 967     }
 968
 969     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 970     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 971     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 972     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 973     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 974     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 975
 976     if (!do_check_io_limits(&io_limits)) {
 977         error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
 978         return;
 979     }
 980
 981     bs->io_limits = io_limits;
 982     bs->slice_time = BLOCK_IO_SLICE_TIME;
 983
 984     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 985         bdrv_io_limits_enable(bs);
 986     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 987         bdrv_io_limits_disable(bs);
 988     } else {
 989         if (bs->block_timer) {
 990             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 991         }
 992     }
 993 }
 994
 995 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 996 {
 997     const char *id = qdict_get_str(qdict, "id");
 998     BlockDriverState *bs;
 999
1000     bs = bdrv_find(id);
1001     if (!bs) {
1002         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1003         return -1;
1004     }
1005     if (bdrv_in_use(bs)) {
1006         qerror_report(QERR_DEVICE_IN_USE, id);
1007         return -1;
1008     }
1009
1010     /* quiesce block driver; prevent further io */
1011     bdrv_drain_all();
1012     bdrv_flush(bs);
1013     bdrv_close(bs);
1014
1015     /* if we have a device attached to this BlockDriverState
1016      * then we need to make the drive anonymous until the device
1017      * can be removed.  If this is a drive with no device backing
1018      * then we can just get rid of the block driver state right here.
1019      */
1020     if (bdrv_get_attached_dev(bs)) {
1021         bdrv_make_anon(bs);
1022     } else {
1023         drive_uninit(drive_get_by_blockdev(bs));
1024     }
1025
1026     return 0;
1027 }
1028
1029 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1030 {
1031     BlockDriverState *bs;
1032
1033     bs = bdrv_find(device);
1034     if (!bs) {
1035         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1036         return;
1037     }
1038
1039     if (size < 0) {
1040         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1041         return;
1042     }
1043
1044     switch (bdrv_truncate(bs, size)) {
1045     case 0:
1046         break;
1047     case -ENOMEDIUM:
1048         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1049         break;
1050     case -ENOTSUP:
1051         error_set(errp, QERR_UNSUPPORTED);
1052         break;
1053     case -EACCES:
1054         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1055         break;
1056     case -EBUSY:
1057         error_set(errp, QERR_DEVICE_IN_USE, device);
1058         break;
1059     default:
1060         error_set(errp, QERR_UNDEFINED_ERROR);
1061         break;
1062     }
1063 }
1064
1065 static void block_job_cb(void *opaque, int ret)
1066 {
1067     BlockDriverState *bs = opaque;
1068     QObject *obj;
1069
1070     trace_block_job_cb(bs, bs->job, ret);
1071
1072     assert(bs->job);
1073     obj = qobject_from_block_job(bs->job);
1074     if (ret < 0) {
1075         QDict *dict = qobject_to_qdict(obj);
1076         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1077     }
1078
1079     if (block_job_is_cancelled(bs->job)) {
1080         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1081     } else {
1082         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1083     }
1084     qobject_decref(obj);
1085
1086     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1087 }
1088
1089 void qmp_block_stream(const char *device, bool has_base,
1090                       const char *base, bool has_speed, int64_t speed,
1091                       bool has_on_error, BlockdevOnError on_error,
1092                       Error **errp)
1093 {
1094     BlockDriverState *bs;
1095     BlockDriverState *base_bs = NULL;
1096     Error *local_err = NULL;
1097
1098     if (!has_on_error) {
1099         on_error = BLOCKDEV_ON_ERROR_REPORT;
1100     }
1101
1102     bs = bdrv_find(device);
1103     if (!bs) {
1104         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1105         return;
1106     }
1107
1108     if (base) {
1109         base_bs = bdrv_find_backing_image(bs, base);
1110         if (base_bs == NULL) {
1111             error_set(errp, QERR_BASE_NOT_FOUND, base);
1112             return;
1113         }
1114     }
1115
1116     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1117                  on_error, block_job_cb, bs, &local_err);
1118     if (error_is_set(&local_err)) {
1119         error_propagate(errp, local_err);
1120         return;
1121     }
1122
1123     /* Grab a reference so hotplug does not delete the BlockDriverState from
1124      * underneath us.
1125      */
1126     drive_get_ref(drive_get_by_blockdev(bs));
1127
1128     trace_qmp_block_stream(bs, bs->job);
1129 }
1130
1131 void qmp_block_commit(const char *device,
1132                       bool has_base, const char *base, const char *top,
1133                       bool has_speed, int64_t speed,
1134                       Error **errp)
1135 {
1136     BlockDriverState *bs;
1137     BlockDriverState *base_bs, *top_bs;
1138     Error *local_err = NULL;
1139     /* This will be part of the QMP command, if/when the
1140      * BlockdevOnError change for blkmirror makes it in
1141      */
1142     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1143
1144     /* drain all i/o before commits */
1145     bdrv_drain_all();
1146
1147     bs = bdrv_find(device);
1148     if (!bs) {
1149         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1150         return;
1151     }
1152
1153     /* default top_bs is the active layer */
1154     top_bs = bs;
1155
1156     if (top) {
1157         if (strcmp(bs->filename, top) != 0) {
1158             top_bs = bdrv_find_backing_image(bs, top);
1159         }
1160     }
1161
1162     if (top_bs == NULL) {
1163         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1164         return;
1165     }
1166
1167     if (has_base && base) {
1168         base_bs = bdrv_find_backing_image(top_bs, base);
1169     } else {
1170         base_bs = bdrv_find_base(top_bs);
1171     }
1172
1173     if (base_bs == NULL) {
1174         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1175         return;
1176     }
1177
1178     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1179                 &local_err);
1180     if (local_err != NULL) {
1181         error_propagate(errp, local_err);
1182         return;
1183     }
1184     /* Grab a reference so hotplug does not delete the BlockDriverState from
1185      * underneath us.
1186      */
1187     drive_get_ref(drive_get_by_blockdev(bs));
1188 }
1189
1190 void qmp_drive_mirror(const char *device, const char *target,
1191                       bool has_format, const char *format,
1192                       enum MirrorSyncMode sync,
1193                       bool has_mode, enum NewImageMode mode,
1194                       bool has_speed, int64_t speed,
1195                       bool has_on_source_error, BlockdevOnError on_source_error,
1196                       bool has_on_target_error, BlockdevOnError on_target_error,
1197                       Error **errp)
1198 {
1199     BlockDriverInfo bdi;
1200     BlockDriverState *bs;
1201     BlockDriverState *source, *target_bs;
1202     BlockDriver *proto_drv;
1203     BlockDriver *drv = NULL;
1204     Error *local_err = NULL;
1205     int flags;
1206     uint64_t size;
1207     int ret;
1208
1209     if (!has_speed) {
1210         speed = 0;
1211     }
1212     if (!has_on_source_error) {
1213         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1214     }
1215     if (!has_on_target_error) {
1216         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1217     }
1218     if (!has_mode) {
1219         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1220     }
1221
1222     bs = bdrv_find(device);
1223     if (!bs) {
1224         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1225         return;
1226     }
1227
1228     if (!bdrv_is_inserted(bs)) {
1229         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1230         return;
1231     }
1232
1233     if (!has_format) {
1234         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1235     }
1236     if (format) {
1237         drv = bdrv_find_format(format);
1238         if (!drv) {
1239             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1240             return;
1241         }
1242     }
1243
1244     if (bdrv_in_use(bs)) {
1245         error_set(errp, QERR_DEVICE_IN_USE, device);
1246         return;
1247     }
1248
1249     flags = bs->open_flags | BDRV_O_RDWR;
1250     source = bs->backing_hd;
1251     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1252         sync = MIRROR_SYNC_MODE_FULL;
1253     }
1254
1255     proto_drv = bdrv_find_protocol(target);
1256     if (!proto_drv) {
1257         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1258         return;
1259     }
1260
1261     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1262         /* create new image w/o backing file */
1263         assert(format && drv);
1264         bdrv_get_geometry(bs, &size);
1265         size *= 512;
1266         ret = bdrv_img_create(target, format,
1267                               NULL, NULL, NULL, size, flags, NULL);
1268     } else {
1269         switch (mode) {
1270         case NEW_IMAGE_MODE_EXISTING:
1271             ret = 0;
1272             break;
1273         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1274             /* create new image with backing file */
1275             ret = bdrv_img_create(target, format,
1276                                   source->filename,
1277                                   source->drv->format_name,
1278                                   NULL, -1, flags, NULL);
1279             break;
1280         default:
1281             abort();
1282         }
1283     }
1284
1285     if (ret) {
1286         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1287         return;
1288     }
1289
1290     target_bs = bdrv_new("");
1291     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1292
1293     if (ret < 0) {
1294         bdrv_delete(target_bs);
1295         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1296         return;
1297     }
1298
1299     /* We need a backing file if we will copy parts of a cluster.  */
1300     if (bdrv_get_info(target_bs, &bdi) >= 0 && bdi.cluster_size != 0 &&
1301         bdi.cluster_size >= BDRV_SECTORS_PER_DIRTY_CHUNK * 512) {
1302         ret = bdrv_open_backing_file(target_bs);
1303         if (ret < 0) {
1304             bdrv_delete(target_bs);
1305             error_set(errp, QERR_OPEN_FILE_FAILED, target);
1306             return;
1307         }
1308     }
1309
1310     mirror_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1311                  block_job_cb, bs, &local_err);
1312     if (local_err != NULL) {
1313         bdrv_delete(target_bs);
1314         error_propagate(errp, local_err);
1315         return;
1316     }
1317
1318     /* Grab a reference so hotplug does not delete the BlockDriverState from
1319      * underneath us.
1320      */
1321     drive_get_ref(drive_get_by_blockdev(bs));
1322 }
1323
1324 static BlockJob *find_block_job(const char *device)
1325 {
1326     BlockDriverState *bs;
1327
1328     bs = bdrv_find(device);
1329     if (!bs || !bs->job) {
1330         return NULL;
1331     }
1332     return bs->job;
1333 }
1334
1335 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1336 {
1337     BlockJob *job = find_block_job(device);
1338
1339     if (!job) {
1340         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1341         return;
1342     }
1343
1344     block_job_set_speed(job, speed, errp);
1345 }
1346
1347 void qmp_block_job_cancel(const char *device,
1348                           bool has_force, bool force, Error **errp)
1349 {
1350     BlockJob *job = find_block_job(device);
1351
1352     if (!has_force) {
1353         force = false;
1354     }
1355
1356     if (!job) {
1357         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1358         return;
1359     }
1360     if (job->paused && !force) {
1361         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1362         return;
1363     }
1364
1365     trace_qmp_block_job_cancel(job);
1366     block_job_cancel(job);
1367 }
1368
1369 void qmp_block_job_pause(const char *device, Error **errp)
1370 {
1371     BlockJob *job = find_block_job(device);
1372
1373     if (!job) {
1374         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1375         return;
1376     }
1377
1378     trace_qmp_block_job_pause(job);
1379     block_job_pause(job);
1380 }
1381
1382 void qmp_block_job_resume(const char *device, Error **errp)
1383 {
1384     BlockJob *job = find_block_job(device);
1385
1386     if (!job) {
1387         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1388         return;
1389     }
1390
1391     trace_qmp_block_job_resume(job);
1392     block_job_resume(job);
1393 }
1394
1395 void qmp_block_job_complete(const char *device, Error **errp)
1396 {
1397     BlockJob *job = find_block_job(device);
1398
1399     if (!job) {
1400         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1401         return;
1402     }
1403
1404     trace_qmp_block_job_complete(job);
1405     block_job_complete(job, errp);
1406 }
1407
1408 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1409 {
1410     BlockJobInfoList **prev = opaque;
1411     BlockJob *job = bs->job;
1412
1413     if (job) {
1414         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1415         elem->value = block_job_query(bs->job);
1416         (*prev)->next = elem;
1417         *prev = elem;
1418     }
1419 }
1420
1421 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1422 {
1423     /* Dummy is a fake list element for holding the head pointer */
1424     BlockJobInfoList dummy = {};
1425     BlockJobInfoList *prev = &dummy;
1426     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1427     return dummy.next;
1428 }