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)
 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_nofail(qemu_find_opts("device"));
 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     } else {
 646         bs = bdrv_find(device);
 647         if (!bs) {
 648             monitor_printf(mon, "Device '%s' not found\n", device);
 649             return;
 650         }
 651         ret = bdrv_commit(bs);
 652     }
 653     if (ret < 0) {
 654         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 655                        strerror(-ret));
 656     }
 657 }
 658
 659 static void blockdev_do_action(int kind, void *data, Error **errp)
 660 {
 661     BlockdevAction action;
 662     BlockdevActionList list;
 663
 664     action.kind = kind;
 665     action.data = data;
 666     list.value = &action;
 667     list.next = NULL;
 668     qmp_transaction(&list, errp);
 669 }
 670
 671 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 672                                 bool has_format, const char *format,
 673                                 bool has_mode, enum NewImageMode mode,
 674                                 Error **errp)
 675 {
 676     BlockdevSnapshot snapshot = {
 677         .device = (char *) device,
 678         .snapshot_file = (char *) snapshot_file,
 679         .has_format = has_format,
 680         .format = (char *) format,
 681         .has_mode = has_mode,
 682         .mode = mode,
 683     };
 684     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 685                        errp);
 686 }
 687
 688
 689 /* New and old BlockDriverState structs for group snapshots */
 690 typedef struct BlkTransactionStates {
 691     BlockDriverState *old_bs;
 692     BlockDriverState *new_bs;
 693     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 694 } BlkTransactionStates;
 695
 696 /*
 697  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 698  *  then we do not pivot any of the devices in the group, and abandon the
 699  *  snapshots
 700  */
 701 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 702 {
 703     int ret = 0;
 704     BlockdevActionList *dev_entry = dev_list;
 705     BlkTransactionStates *states, *next;
 706     Error *local_err = NULL;
 707
 708     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 709     QSIMPLEQ_INIT(&snap_bdrv_states);
 710
 711     /* drain all i/o before any snapshots */
 712     bdrv_drain_all();
 713
 714     /* We don't do anything in this loop that commits us to the snapshot */
 715     while (NULL != dev_entry) {
 716         BlockdevAction *dev_info = NULL;
 717         BlockDriver *proto_drv;
 718         BlockDriver *drv;
 719         int flags;
 720         enum NewImageMode mode;
 721         const char *new_image_file;
 722         const char *device;
 723         const char *format = "qcow2";
 724
 725         dev_info = dev_entry->value;
 726         dev_entry = dev_entry->next;
 727
 728         states = g_malloc0(sizeof(BlkTransactionStates));
 729         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 730
 731         switch (dev_info->kind) {
 732         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 733             device = dev_info->blockdev_snapshot_sync->device;
 734             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 735                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 736             }
 737             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 738             if (dev_info->blockdev_snapshot_sync->has_format) {
 739                 format = dev_info->blockdev_snapshot_sync->format;
 740             }
 741             mode = dev_info->blockdev_snapshot_sync->mode;
 742             break;
 743         default:
 744             abort();
 745         }
 746
 747         drv = bdrv_find_format(format);
 748         if (!drv) {
 749             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 750             goto delete_and_fail;
 751         }
 752
 753         states->old_bs = bdrv_find(device);
 754         if (!states->old_bs) {
 755             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 756             goto delete_and_fail;
 757         }
 758
 759         if (!bdrv_is_inserted(states->old_bs)) {
 760             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 761             goto delete_and_fail;
 762         }
 763
 764         if (bdrv_in_use(states->old_bs)) {
 765             error_set(errp, QERR_DEVICE_IN_USE, device);
 766             goto delete_and_fail;
 767         }
 768
 769         if (!bdrv_is_read_only(states->old_bs)) {
 770             if (bdrv_flush(states->old_bs)) {
 771                 error_set(errp, QERR_IO_ERROR);
 772                 goto delete_and_fail;
 773             }
 774         }
 775
 776         flags = states->old_bs->open_flags;
 777
 778         proto_drv = bdrv_find_protocol(new_image_file);
 779         if (!proto_drv) {
 780             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 781             goto delete_and_fail;
 782         }
 783
 784         /* create new image w/backing file */
 785         if (mode != NEW_IMAGE_MODE_EXISTING) {
 786             bdrv_img_create(new_image_file, format,
 787                             states->old_bs->filename,
 788                             states->old_bs->drv->format_name,
 789                             NULL, -1, flags, &local_err);
 790             if (error_is_set(&local_err)) {
 791                 error_propagate(errp, local_err);
 792                 goto delete_and_fail;
 793             }
 794         }
 795
 796         /* We will manually add the backing_hd field to the bs later */
 797         states->new_bs = bdrv_new("");
 798         ret = bdrv_open(states->new_bs, new_image_file,
 799                         flags | BDRV_O_NO_BACKING, drv);
 800         if (ret != 0) {
 801             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 802             goto delete_and_fail;
 803         }
 804     }
 805
 806
 807     /* Now we are going to do the actual pivot.  Everything up to this point
 808      * is reversible, but we are committed at this point */
 809     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 810         /* This removes our old bs from the bdrv_states, and adds the new bs */
 811         bdrv_append(states->new_bs, states->old_bs);
 812         /* We don't need (or want) to use the transactional
 813          * bdrv_reopen_multiple() across all the entries at once, because we
 814          * don't want to abort all of them if one of them fails the reopen */
 815         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 816                     NULL);
 817     }
 818
 819     /* success */
 820     goto exit;
 821
 822 delete_and_fail:
 823     /*
 824     * failure, and it is all-or-none; abandon each new bs, and keep using
 825     * the original bs for all images
 826     */
 827     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 828         if (states->new_bs) {
 829              bdrv_delete(states->new_bs);
 830         }
 831     }
 832 exit:
 833     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 834         g_free(states);
 835     }
 836 }
 837
 838
 839 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 840 {
 841     if (bdrv_in_use(bs)) {
 842         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 843         return;
 844     }
 845     if (!bdrv_dev_has_removable_media(bs)) {
 846         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 847         return;
 848     }
 849
 850     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 851         bdrv_dev_eject_request(bs, force);
 852         if (!force) {
 853             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 854             return;
 855         }
 856     }
 857
 858     bdrv_close(bs);
 859 }
 860
 861 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 862 {
 863     BlockDriverState *bs;
 864
 865     bs = bdrv_find(device);
 866     if (!bs) {
 867         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 868         return;
 869     }
 870
 871     eject_device(bs, force, errp);
 872 }
 873
 874 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 875 {
 876     BlockDriverState *bs;
 877     int err;
 878
 879     bs = bdrv_find(device);
 880     if (!bs) {
 881         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 882         return;
 883     }
 884
 885     err = bdrv_set_key(bs, password);
 886     if (err == -EINVAL) {
 887         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 888         return;
 889     } else if (err < 0) {
 890         error_set(errp, QERR_INVALID_PASSWORD);
 891         return;
 892     }
 893 }
 894
 895 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 896                                     int bdrv_flags, BlockDriver *drv,
 897                                     const char *password, Error **errp)
 898 {
 899     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 900         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 901         return;
 902     }
 903
 904     if (bdrv_key_required(bs)) {
 905         if (password) {
 906             if (bdrv_set_key(bs, password) < 0) {
 907                 error_set(errp, QERR_INVALID_PASSWORD);
 908             }
 909         } else {
 910             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 911                       bdrv_get_encrypted_filename(bs));
 912         }
 913     } else if (password) {
 914         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 915     }
 916 }
 917
 918 void qmp_change_blockdev(const char *device, const char *filename,
 919                          bool has_format, const char *format, Error **errp)
 920 {
 921     BlockDriverState *bs;
 922     BlockDriver *drv = NULL;
 923     int bdrv_flags;
 924     Error *err = NULL;
 925
 926     bs = bdrv_find(device);
 927     if (!bs) {
 928         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 929         return;
 930     }
 931
 932     if (format) {
 933         drv = bdrv_find_whitelisted_format(format);
 934         if (!drv) {
 935             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 936             return;
 937         }
 938     }
 939
 940     eject_device(bs, 0, &err);
 941     if (error_is_set(&err)) {
 942         error_propagate(errp, err);
 943         return;
 944     }
 945
 946     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 947     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 948
 949     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 950 }
 951
 952 /* throttling disk I/O limits */
 953 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 954                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 955                                int64_t iops_wr, Error **errp)
 956 {
 957     BlockIOLimit io_limits;
 958     BlockDriverState *bs;
 959
 960     bs = bdrv_find(device);
 961     if (!bs) {
 962         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 963         return;
 964     }
 965
 966     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 967     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 968     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 969     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 970     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 971     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 972
 973     if (!do_check_io_limits(&io_limits)) {
 974         error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
 975         return;
 976     }
 977
 978     bs->io_limits = io_limits;
 979     bs->slice_time = BLOCK_IO_SLICE_TIME;
 980
 981     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 982         bdrv_io_limits_enable(bs);
 983     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 984         bdrv_io_limits_disable(bs);
 985     } else {
 986         if (bs->block_timer) {
 987             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 988         }
 989     }
 990 }
 991
 992 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 993 {
 994     const char *id = qdict_get_str(qdict, "id");
 995     BlockDriverState *bs;
 996
 997     bs = bdrv_find(id);
 998     if (!bs) {
 999         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1000         return -1;
1001     }
1002     if (bdrv_in_use(bs)) {
1003         qerror_report(QERR_DEVICE_IN_USE, id);
1004         return -1;
1005     }
1006
1007     /* quiesce block driver; prevent further io */
1008     bdrv_drain_all();
1009     bdrv_flush(bs);
1010     bdrv_close(bs);
1011
1012     /* if we have a device attached to this BlockDriverState
1013      * then we need to make the drive anonymous until the device
1014      * can be removed.  If this is a drive with no device backing
1015      * then we can just get rid of the block driver state right here.
1016      */
1017     if (bdrv_get_attached_dev(bs)) {
1018         bdrv_make_anon(bs);
1019     } else {
1020         drive_uninit(drive_get_by_blockdev(bs));
1021     }
1022
1023     return 0;
1024 }
1025
1026 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1027 {
1028     BlockDriverState *bs;
1029
1030     bs = bdrv_find(device);
1031     if (!bs) {
1032         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1033         return;
1034     }
1035
1036     if (size < 0) {
1037         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1038         return;
1039     }
1040
1041     switch (bdrv_truncate(bs, size)) {
1042     case 0:
1043         break;
1044     case -ENOMEDIUM:
1045         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1046         break;
1047     case -ENOTSUP:
1048         error_set(errp, QERR_UNSUPPORTED);
1049         break;
1050     case -EACCES:
1051         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1052         break;
1053     case -EBUSY:
1054         error_set(errp, QERR_DEVICE_IN_USE, device);
1055         break;
1056     default:
1057         error_set(errp, QERR_UNDEFINED_ERROR);
1058         break;
1059     }
1060 }
1061
1062 static void block_job_cb(void *opaque, int ret)
1063 {
1064     BlockDriverState *bs = opaque;
1065     QObject *obj;
1066
1067     trace_block_job_cb(bs, bs->job, ret);
1068
1069     assert(bs->job);
1070     obj = qobject_from_block_job(bs->job);
1071     if (ret < 0) {
1072         QDict *dict = qobject_to_qdict(obj);
1073         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1074     }
1075
1076     if (block_job_is_cancelled(bs->job)) {
1077         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1078     } else {
1079         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1080     }
1081     qobject_decref(obj);
1082
1083     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1084 }
1085
1086 void qmp_block_stream(const char *device, bool has_base,
1087                       const char *base, bool has_speed, int64_t speed,
1088                       bool has_on_error, BlockdevOnError on_error,
1089                       Error **errp)
1090 {
1091     BlockDriverState *bs;
1092     BlockDriverState *base_bs = NULL;
1093     Error *local_err = NULL;
1094
1095     if (!has_on_error) {
1096         on_error = BLOCKDEV_ON_ERROR_REPORT;
1097     }
1098
1099     bs = bdrv_find(device);
1100     if (!bs) {
1101         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1102         return;
1103     }
1104
1105     if (base) {
1106         base_bs = bdrv_find_backing_image(bs, base);
1107         if (base_bs == NULL) {
1108             error_set(errp, QERR_BASE_NOT_FOUND, base);
1109             return;
1110         }
1111     }
1112
1113     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1114                  on_error, block_job_cb, bs, &local_err);
1115     if (error_is_set(&local_err)) {
1116         error_propagate(errp, local_err);
1117         return;
1118     }
1119
1120     /* Grab a reference so hotplug does not delete the BlockDriverState from
1121      * underneath us.
1122      */
1123     drive_get_ref(drive_get_by_blockdev(bs));
1124
1125     trace_qmp_block_stream(bs, bs->job);
1126 }
1127
1128 void qmp_block_commit(const char *device,
1129                       bool has_base, const char *base, const char *top,
1130                       bool has_speed, int64_t speed,
1131                       Error **errp)
1132 {
1133     BlockDriverState *bs;
1134     BlockDriverState *base_bs, *top_bs;
1135     Error *local_err = NULL;
1136     /* This will be part of the QMP command, if/when the
1137      * BlockdevOnError change for blkmirror makes it in
1138      */
1139     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1140
1141     /* drain all i/o before commits */
1142     bdrv_drain_all();
1143
1144     bs = bdrv_find(device);
1145     if (!bs) {
1146         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1147         return;
1148     }
1149
1150     /* default top_bs is the active layer */
1151     top_bs = bs;
1152
1153     if (top) {
1154         if (strcmp(bs->filename, top) != 0) {
1155             top_bs = bdrv_find_backing_image(bs, top);
1156         }
1157     }
1158
1159     if (top_bs == NULL) {
1160         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1161         return;
1162     }
1163
1164     if (has_base && base) {
1165         base_bs = bdrv_find_backing_image(top_bs, base);
1166     } else {
1167         base_bs = bdrv_find_base(top_bs);
1168     }
1169
1170     if (base_bs == NULL) {
1171         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1172         return;
1173     }
1174
1175     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1176                 &local_err);
1177     if (local_err != NULL) {
1178         error_propagate(errp, local_err);
1179         return;
1180     }
1181     /* Grab a reference so hotplug does not delete the BlockDriverState from
1182      * underneath us.
1183      */
1184     drive_get_ref(drive_get_by_blockdev(bs));
1185 }
1186
1187 void qmp_drive_mirror(const char *device, const char *target,
1188                       bool has_format, const char *format,
1189                       enum MirrorSyncMode sync,
1190                       bool has_mode, enum NewImageMode mode,
1191                       bool has_speed, int64_t speed,
1192                       bool has_on_source_error, BlockdevOnError on_source_error,
1193                       bool has_on_target_error, BlockdevOnError on_target_error,
1194                       Error **errp)
1195 {
1196     BlockDriverInfo bdi;
1197     BlockDriverState *bs;
1198     BlockDriverState *source, *target_bs;
1199     BlockDriver *proto_drv;
1200     BlockDriver *drv = NULL;
1201     Error *local_err = NULL;
1202     int flags;
1203     uint64_t size;
1204     int ret;
1205
1206     if (!has_speed) {
1207         speed = 0;
1208     }
1209     if (!has_on_source_error) {
1210         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1211     }
1212     if (!has_on_target_error) {
1213         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1214     }
1215     if (!has_mode) {
1216         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1217     }
1218
1219     bs = bdrv_find(device);
1220     if (!bs) {
1221         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1222         return;
1223     }
1224
1225     if (!bdrv_is_inserted(bs)) {
1226         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1227         return;
1228     }
1229
1230     if (!has_format) {
1231         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1232     }
1233     if (format) {
1234         drv = bdrv_find_format(format);
1235         if (!drv) {
1236             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1237             return;
1238         }
1239     }
1240
1241     if (bdrv_in_use(bs)) {
1242         error_set(errp, QERR_DEVICE_IN_USE, device);
1243         return;
1244     }
1245
1246     flags = bs->open_flags | BDRV_O_RDWR;
1247     source = bs->backing_hd;
1248     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1249         sync = MIRROR_SYNC_MODE_FULL;
1250     }
1251
1252     proto_drv = bdrv_find_protocol(target);
1253     if (!proto_drv) {
1254         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1255         return;
1256     }
1257
1258     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1259         /* create new image w/o backing file */
1260         assert(format && drv);
1261         bdrv_get_geometry(bs, &size);
1262         size *= 512;
1263         bdrv_img_create(target, format,
1264                         NULL, NULL, NULL, size, flags, &local_err);
1265     } else {
1266         switch (mode) {
1267         case NEW_IMAGE_MODE_EXISTING:
1268             ret = 0;
1269             break;
1270         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1271             /* create new image with backing file */
1272             bdrv_img_create(target, format,
1273                             source->filename,
1274                             source->drv->format_name,
1275                             NULL, -1, flags, &local_err);
1276             break;
1277         default:
1278             abort();
1279         }
1280     }
1281
1282     if (error_is_set(&local_err)) {
1283         error_propagate(errp, local_err);
1284         return;
1285     }
1286
1287     target_bs = bdrv_new("");
1288     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1289
1290     if (ret < 0) {
1291         bdrv_delete(target_bs);
1292         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1293         return;
1294     }
1295
1296     /* We need a backing file if we will copy parts of a cluster.  */
1297     if (bdrv_get_info(target_bs, &bdi) >= 0 && bdi.cluster_size != 0 &&
1298         bdi.cluster_size >= BDRV_SECTORS_PER_DIRTY_CHUNK * 512) {
1299         ret = bdrv_open_backing_file(target_bs);
1300         if (ret < 0) {
1301             bdrv_delete(target_bs);
1302             error_set(errp, QERR_OPEN_FILE_FAILED, target);
1303             return;
1304         }
1305     }
1306
1307     mirror_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1308                  block_job_cb, bs, &local_err);
1309     if (local_err != NULL) {
1310         bdrv_delete(target_bs);
1311         error_propagate(errp, local_err);
1312         return;
1313     }
1314
1315     /* Grab a reference so hotplug does not delete the BlockDriverState from
1316      * underneath us.
1317      */
1318     drive_get_ref(drive_get_by_blockdev(bs));
1319 }
1320
1321 static BlockJob *find_block_job(const char *device)
1322 {
1323     BlockDriverState *bs;
1324
1325     bs = bdrv_find(device);
1326     if (!bs || !bs->job) {
1327         return NULL;
1328     }
1329     return bs->job;
1330 }
1331
1332 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1333 {
1334     BlockJob *job = find_block_job(device);
1335
1336     if (!job) {
1337         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1338         return;
1339     }
1340
1341     block_job_set_speed(job, speed, errp);
1342 }
1343
1344 void qmp_block_job_cancel(const char *device,
1345                           bool has_force, bool force, Error **errp)
1346 {
1347     BlockJob *job = find_block_job(device);
1348
1349     if (!has_force) {
1350         force = false;
1351     }
1352
1353     if (!job) {
1354         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1355         return;
1356     }
1357     if (job->paused && !force) {
1358         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1359         return;
1360     }
1361
1362     trace_qmp_block_job_cancel(job);
1363     block_job_cancel(job);
1364 }
1365
1366 void qmp_block_job_pause(const char *device, Error **errp)
1367 {
1368     BlockJob *job = find_block_job(device);
1369
1370     if (!job) {
1371         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1372         return;
1373     }
1374
1375     trace_qmp_block_job_pause(job);
1376     block_job_pause(job);
1377 }
1378
1379 void qmp_block_job_resume(const char *device, Error **errp)
1380 {
1381     BlockJob *job = find_block_job(device);
1382
1383     if (!job) {
1384         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1385         return;
1386     }
1387
1388     trace_qmp_block_job_resume(job);
1389     block_job_resume(job);
1390 }
1391
1392 void qmp_block_job_complete(const char *device, Error **errp)
1393 {
1394     BlockJob *job = find_block_job(device);
1395
1396     if (!job) {
1397         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1398         return;
1399     }
1400
1401     trace_qmp_block_job_complete(job);
1402     block_job_complete(job, errp);
1403 }
1404
1405 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1406 {
1407     BlockJobInfoList **prev = opaque;
1408     BlockJob *job = bs->job;
1409
1410     if (job) {
1411         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1412         elem->value = block_job_query(bs->job);
1413         (*prev)->next = elem;
1414         *prev = elem;
1415     }
1416 }
1417
1418 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1419 {
1420     /* Dummy is a fake list element for holding the head pointer */
1421     BlockJobInfoList dummy = {};
1422     BlockJobInfoList *prev = &dummy;
1423     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1424     return dummy.next;
1425 }
1426
1427 QemuOptsList qemu_drive_opts = {
1428     .name = "drive",
1429     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1430     .desc = {
1431         {
1432             .name = "bus",
1433             .type = QEMU_OPT_NUMBER,
1434             .help = "bus number",
1435         },{
1436             .name = "unit",
1437             .type = QEMU_OPT_NUMBER,
1438             .help = "unit number (i.e. lun for scsi)",
1439         },{
1440             .name = "if",
1441             .type = QEMU_OPT_STRING,
1442             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1443         },{
1444             .name = "index",
1445             .type = QEMU_OPT_NUMBER,
1446             .help = "index number",
1447         },{
1448             .name = "cyls",
1449             .type = QEMU_OPT_NUMBER,
1450             .help = "number of cylinders (ide disk geometry)",
1451         },{
1452             .name = "heads",
1453             .type = QEMU_OPT_NUMBER,
1454             .help = "number of heads (ide disk geometry)",
1455         },{
1456             .name = "secs",
1457             .type = QEMU_OPT_NUMBER,
1458             .help = "number of sectors (ide disk geometry)",
1459         },{
1460             .name = "trans",
1461             .type = QEMU_OPT_STRING,
1462             .help = "chs translation (auto, lba. none)",
1463         },{
1464             .name = "media",
1465             .type = QEMU_OPT_STRING,
1466             .help = "media type (disk, cdrom)",
1467         },{
1468             .name = "snapshot",
1469             .type = QEMU_OPT_BOOL,
1470             .help = "enable/disable snapshot mode",
1471         },{
1472             .name = "file",
1473             .type = QEMU_OPT_STRING,
1474             .help = "disk image",
1475         },{
1476             .name = "cache",
1477             .type = QEMU_OPT_STRING,
1478             .help = "host cache usage (none, writeback, writethrough, "
1479                     "directsync, unsafe)",
1480         },{
1481             .name = "aio",
1482             .type = QEMU_OPT_STRING,
1483             .help = "host AIO implementation (threads, native)",
1484         },{
1485             .name = "format",
1486             .type = QEMU_OPT_STRING,
1487             .help = "disk format (raw, qcow2, ...)",
1488         },{
1489             .name = "serial",
1490             .type = QEMU_OPT_STRING,
1491             .help = "disk serial number",
1492         },{
1493             .name = "rerror",
1494             .type = QEMU_OPT_STRING,
1495             .help = "read error action",
1496         },{
1497             .name = "werror",
1498             .type = QEMU_OPT_STRING,
1499             .help = "write error action",
1500         },{
1501             .name = "addr",
1502             .type = QEMU_OPT_STRING,
1503             .help = "pci address (virtio only)",
1504         },{
1505             .name = "readonly",
1506             .type = QEMU_OPT_BOOL,
1507             .help = "open drive file as read-only",
1508         },{
1509             .name = "iops",
1510             .type = QEMU_OPT_NUMBER,
1511             .help = "limit total I/O operations per second",
1512         },{
1513             .name = "iops_rd",
1514             .type = QEMU_OPT_NUMBER,
1515             .help = "limit read operations per second",
1516         },{
1517             .name = "iops_wr",
1518             .type = QEMU_OPT_NUMBER,
1519             .help = "limit write operations per second",
1520         },{
1521             .name = "bps",
1522             .type = QEMU_OPT_NUMBER,
1523             .help = "limit total bytes per second",
1524         },{
1525             .name = "bps_rd",
1526             .type = QEMU_OPT_NUMBER,
1527             .help = "limit read bytes per second",
1528         },{
1529             .name = "bps_wr",
1530             .type = QEMU_OPT_NUMBER,
1531             .help = "limit write bytes per second",
1532         },{
1533             .name = "copy-on-read",
1534             .type = QEMU_OPT_BOOL,
1535             .help = "copy read data from backing file into image file",
1536         },{
1537             .name = "boot",
1538             .type = QEMU_OPT_BOOL,
1539             .help = "(deprecated, ignored)",
1540         },
1541         { /* end of list */ }
1542     },
1543 };