blockdev.c

   1 /*
   2  * QEMU host block devices
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or
   7  * later.  See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "sysemu/blockdev.h"
  11 #include "hw/block-common.h"
  12 #include "block/blockjob.h"
  13 #include "monitor/monitor.h"
  14 #include "qapi/qmp/qerror.h"
  15 #include "qemu/option.h"
  16 #include "qemu/config-file.h"
  17 #include "qapi/qmp/types.h"
  18 #include "sysemu/sysemu.h"
  19 #include "block/block_int.h"
  20 #include "qmp-commands.h"
  21 #include "trace.h"
  22 #include "sysemu/arch_init.h"
  23
  24 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  25
  26 static const char *const if_name[IF_COUNT] = {
  27     [IF_NONE] = "none",
  28     [IF_IDE] = "ide",
  29     [IF_SCSI] = "scsi",
  30     [IF_FLOPPY] = "floppy",
  31     [IF_PFLASH] = "pflash",
  32     [IF_MTD] = "mtd",
  33     [IF_SD] = "sd",
  34     [IF_VIRTIO] = "virtio",
  35     [IF_XEN] = "xen",
  36 };
  37
  38 static const int if_max_devs[IF_COUNT] = {
  39     /*
  40      * Do not change these numbers!  They govern how drive option
  41      * index maps to unit and bus.  That mapping is ABI.
  42      *
  43      * All controllers used to imlement if=T drives need to support
  44      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  45      * Otherwise, some index values map to "impossible" bus, unit
  46      * values.
  47      *
  48      * For instance, if you change [IF_SCSI] to 255, -drive
  49      * if=scsi,index=12 no longer means bus=1,unit=5, but
  50      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  51      * the drive can't be set up.  Regression.
  52      */
  53     [IF_IDE] = 2,
  54     [IF_SCSI] = 7,
  55 };
  56
  57 /*
  58  * We automatically delete the drive when a device using it gets
  59  * unplugged.  Questionable feature, but we can't just drop it.
  60  * Device models call blockdev_mark_auto_del() to schedule the
  61  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  62  * when deletion is actually safe.
  63  */
  64 void blockdev_mark_auto_del(BlockDriverState *bs)
  65 {
  66     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  67
  68     if (bs->job) {
  69         block_job_cancel(bs->job);
  70     }
  71     if (dinfo) {
  72         dinfo->auto_del = 1;
  73     }
  74 }
  75
  76 void blockdev_auto_del(BlockDriverState *bs)
  77 {
  78     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  79
  80     if (dinfo && dinfo->auto_del) {
  81         drive_put_ref(dinfo);
  82     }
  83 }
  84
  85 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
  86 {
  87     int max_devs = if_max_devs[type];
  88     return max_devs ? index / max_devs : 0;
  89 }
  90
  91 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
  92 {
  93     int max_devs = if_max_devs[type];
  94     return max_devs ? index % max_devs : index;
  95 }
  96
  97 QemuOpts *drive_def(const char *optstr)
  98 {
  99     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
 100 }
 101
 102 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 103                     const char *optstr)
 104 {
 105     QemuOpts *opts;
 106     char buf[32];
 107
 108     opts = drive_def(optstr);
 109     if (!opts) {
 110         return NULL;
 111     }
 112     if (type != IF_DEFAULT) {
 113         qemu_opt_set(opts, "if", if_name[type]);
 114     }
 115     if (index >= 0) {
 116         snprintf(buf, sizeof(buf), "%d", index);
 117         qemu_opt_set(opts, "index", buf);
 118     }
 119     if (file)
 120         qemu_opt_set(opts, "file", file);
 121     return opts;
 122 }
 123
 124 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 125 {
 126     DriveInfo *dinfo;
 127
 128     /* seek interface, bus and unit */
 129
 130     QTAILQ_FOREACH(dinfo, &drives, next) {
 131         if (dinfo->type == type &&
 132             dinfo->bus == bus &&
 133             dinfo->unit == unit)
 134             return dinfo;
 135     }
 136
 137     return NULL;
 138 }
 139
 140 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 141 {
 142     return drive_get(type,
 143                      drive_index_to_bus_id(type, index),
 144                      drive_index_to_unit_id(type, index));
 145 }
 146
 147 int drive_get_max_bus(BlockInterfaceType type)
 148 {
 149     int max_bus;
 150     DriveInfo *dinfo;
 151
 152     max_bus = -1;
 153     QTAILQ_FOREACH(dinfo, &drives, next) {
 154         if(dinfo->type == type &&
 155            dinfo->bus > max_bus)
 156             max_bus = dinfo->bus;
 157     }
 158     return max_bus;
 159 }
 160
 161 /* Get a block device.  This should only be used for single-drive devices
 162    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 163    appropriate bus.  */
 164 DriveInfo *drive_get_next(BlockInterfaceType type)
 165 {
 166     static int next_block_unit[IF_COUNT];
 167
 168     return drive_get(type, 0, next_block_unit[type]++);
 169 }
 170
 171 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 172 {
 173     DriveInfo *dinfo;
 174
 175     QTAILQ_FOREACH(dinfo, &drives, next) {
 176         if (dinfo->bdrv == bs) {
 177             return dinfo;
 178         }
 179     }
 180     return NULL;
 181 }
 182
 183 static void bdrv_format_print(void *opaque, const char *name)
 184 {
 185     error_printf(" %s", name);
 186 }
 187
 188 static void drive_uninit(DriveInfo *dinfo)
 189 {
 190     qemu_opts_del(dinfo->opts);
 191     bdrv_delete(dinfo->bdrv);
 192     g_free(dinfo->id);
 193     QTAILQ_REMOVE(&drives, dinfo, next);
 194     g_free(dinfo);
 195 }
 196
 197 void drive_put_ref(DriveInfo *dinfo)
 198 {
 199     assert(dinfo->refcount);
 200     if (--dinfo->refcount == 0) {
 201         drive_uninit(dinfo);
 202     }
 203 }
 204
 205 void drive_get_ref(DriveInfo *dinfo)
 206 {
 207     dinfo->refcount++;
 208 }
 209
 210 typedef struct {
 211     QEMUBH *bh;
 212     DriveInfo *dinfo;
 213 } DrivePutRefBH;
 214
 215 static void drive_put_ref_bh(void *opaque)
 216 {
 217     DrivePutRefBH *s = opaque;
 218
 219     drive_put_ref(s->dinfo);
 220     qemu_bh_delete(s->bh);
 221     g_free(s);
 222 }
 223
 224 /*
 225  * Release a drive reference in a BH
 226  *
 227  * It is not possible to use drive_put_ref() from a callback function when the
 228  * callers still need the drive.  In such cases we schedule a BH to release the
 229  * reference.
 230  */
 231 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
 232 {
 233     DrivePutRefBH *s;
 234
 235     s = g_new(DrivePutRefBH, 1);
 236     s->bh = qemu_bh_new(drive_put_ref_bh, s);
 237     s->dinfo = dinfo;
 238     qemu_bh_schedule(s->bh);
 239 }
 240
 241 static int parse_block_error_action(const char *buf, bool is_read)
 242 {
 243     if (!strcmp(buf, "ignore")) {
 244         return BLOCKDEV_ON_ERROR_IGNORE;
 245     } else if (!is_read && !strcmp(buf, "enospc")) {
 246         return BLOCKDEV_ON_ERROR_ENOSPC;
 247     } else if (!strcmp(buf, "stop")) {
 248         return BLOCKDEV_ON_ERROR_STOP;
 249     } else if (!strcmp(buf, "report")) {
 250         return BLOCKDEV_ON_ERROR_REPORT;
 251     } else {
 252         error_report("'%s' invalid %s error action",
 253                      buf, is_read ? "read" : "write");
 254         return -1;
 255     }
 256 }
 257
 258 static bool do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
 259 {
 260     bool bps_flag;
 261     bool iops_flag;
 262
 263     assert(io_limits);
 264
 265     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 266                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 267                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 268     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 269                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 270                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 271     if (bps_flag || iops_flag) {
 272         error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 273                          "cannot be used at the same time");
 274         return false;
 275     }
 276
 277     if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 278         io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
 279         io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
 280         io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 281         io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
 282         io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
 283         error_setg(errp, "bps and iops values must be 0 or greater");
 284         return false;
 285     }
 286
 287     return true;
 288 }
 289
 290 DriveInfo *drive_init(QemuOpts *opts, BlockInterfaceType block_default_type)
 291 {
 292     const char *buf;
 293     const char *file = NULL;
 294     const char *serial;
 295     const char *mediastr = "";
 296     BlockInterfaceType type;
 297     enum { MEDIA_DISK, MEDIA_CDROM } media;
 298     int bus_id, unit_id;
 299     int cyls, heads, secs, translation;
 300     BlockDriver *drv = NULL;
 301     int max_devs;
 302     int index;
 303     int ro = 0;
 304     int bdrv_flags = 0;
 305     int on_read_error, on_write_error;
 306     const char *devaddr;
 307     DriveInfo *dinfo;
 308     BlockIOLimit io_limits;
 309     int snapshot = 0;
 310     bool copy_on_read;
 311     int ret;
 312     Error *error = NULL;
 313
 314     translation = BIOS_ATA_TRANSLATION_AUTO;
 315     media = MEDIA_DISK;
 316
 317     /* extract parameters */
 318     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 319     unit_id = qemu_opt_get_number(opts, "unit", -1);
 320     index   = qemu_opt_get_number(opts, "index", -1);
 321
 322     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 323     heads = qemu_opt_get_number(opts, "heads", 0);
 324     secs  = qemu_opt_get_number(opts, "secs", 0);
 325
 326     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 327     ro = qemu_opt_get_bool(opts, "readonly", 0);
 328     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 329
 330     file = qemu_opt_get(opts, "file");
 331     serial = qemu_opt_get(opts, "serial");
 332
 333     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 334         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 335             ;
 336         if (type == IF_COUNT) {
 337             error_report("unsupported bus type '%s'", buf);
 338             return NULL;
 339         }
 340     } else {
 341         type = block_default_type;
 342     }
 343
 344     max_devs = if_max_devs[type];
 345
 346     if (cyls || heads || secs) {
 347         if (cyls < 1) {
 348             error_report("invalid physical cyls number");
 349             return NULL;
 350         }
 351         if (heads < 1) {
 352             error_report("invalid physical heads number");
 353             return NULL;
 354         }
 355         if (secs < 1) {
 356             error_report("invalid physical secs number");
 357             return NULL;
 358         }
 359     }
 360
 361     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 362         if (!cyls) {
 363             error_report("'%s' trans must be used with cyls, heads and secs",
 364                          buf);
 365             return NULL;
 366         }
 367         if (!strcmp(buf, "none"))
 368             translation = BIOS_ATA_TRANSLATION_NONE;
 369         else if (!strcmp(buf, "lba"))
 370             translation = BIOS_ATA_TRANSLATION_LBA;
 371         else if (!strcmp(buf, "auto"))
 372             translation = BIOS_ATA_TRANSLATION_AUTO;
 373         else {
 374             error_report("'%s' invalid translation type", buf);
 375             return NULL;
 376         }
 377     }
 378
 379     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 380         if (!strcmp(buf, "disk")) {
 381             media = MEDIA_DISK;
 382         } else if (!strcmp(buf, "cdrom")) {
 383             if (cyls || secs || heads) {
 384                 error_report("CHS can't be set with media=%s", buf);
 385                 return NULL;
 386             }
 387             media = MEDIA_CDROM;
 388         } else {
 389             error_report("'%s' invalid media", buf);
 390             return NULL;
 391         }
 392     }
 393
 394     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
 395         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
 396             error_report("invalid discard option");
 397             return NULL;
 398         }
 399     }
 400
 401     bdrv_flags |= BDRV_O_CACHE_WB;
 402     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 403         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 404             error_report("invalid cache option");
 405             return NULL;
 406         }
 407     }
 408
 409 #ifdef CONFIG_LINUX_AIO
 410     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 411         if (!strcmp(buf, "native")) {
 412             bdrv_flags |= BDRV_O_NATIVE_AIO;
 413         } else if (!strcmp(buf, "threads")) {
 414             /* this is the default */
 415         } else {
 416            error_report("invalid aio option");
 417            return NULL;
 418         }
 419     }
 420 #endif
 421
 422     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 423         if (is_help_option(buf)) {
 424             error_printf("Supported formats:");
 425             bdrv_iterate_format(bdrv_format_print, NULL);
 426             error_printf("\n");
 427             return NULL;
 428         }
 429         drv = bdrv_find_whitelisted_format(buf);
 430         if (!drv) {
 431             error_report("'%s' invalid format", buf);
 432             return NULL;
 433         }
 434     }
 435
 436     /* disk I/O throttling */
 437     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 438                            qemu_opt_get_number(opts, "bps", 0);
 439     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 440                            qemu_opt_get_number(opts, "bps_rd", 0);
 441     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 442                            qemu_opt_get_number(opts, "bps_wr", 0);
 443     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 444                            qemu_opt_get_number(opts, "iops", 0);
 445     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 446                            qemu_opt_get_number(opts, "iops_rd", 0);
 447     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 448                            qemu_opt_get_number(opts, "iops_wr", 0);
 449
 450     if (!do_check_io_limits(&io_limits, &error)) {
 451         error_report("%s", error_get_pretty(error));
 452         error_free(error);
 453         return NULL;
 454     }
 455
 456     if (qemu_opt_get(opts, "boot") != NULL) {
 457         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 458                 "ignored. Future versions will reject this parameter. Please "
 459                 "update your scripts.\n");
 460     }
 461
 462     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 463     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 464         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 465             error_report("werror is not supported by this bus type");
 466             return NULL;
 467         }
 468
 469         on_write_error = parse_block_error_action(buf, 0);
 470         if (on_write_error < 0) {
 471             return NULL;
 472         }
 473     }
 474
 475     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 476     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 477         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 478             error_report("rerror is not supported by this bus type");
 479             return NULL;
 480         }
 481
 482         on_read_error = parse_block_error_action(buf, 1);
 483         if (on_read_error < 0) {
 484             return NULL;
 485         }
 486     }
 487
 488     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 489         if (type != IF_VIRTIO) {
 490             error_report("addr is not supported by this bus type");
 491             return NULL;
 492         }
 493     }
 494
 495     /* compute bus and unit according index */
 496
 497     if (index != -1) {
 498         if (bus_id != 0 || unit_id != -1) {
 499             error_report("index cannot be used with bus and unit");
 500             return NULL;
 501         }
 502         bus_id = drive_index_to_bus_id(type, index);
 503         unit_id = drive_index_to_unit_id(type, index);
 504     }
 505
 506     /* if user doesn't specify a unit_id,
 507      * try to find the first free
 508      */
 509
 510     if (unit_id == -1) {
 511        unit_id = 0;
 512        while (drive_get(type, bus_id, unit_id) != NULL) {
 513            unit_id++;
 514            if (max_devs && unit_id >= max_devs) {
 515                unit_id -= max_devs;
 516                bus_id++;
 517            }
 518        }
 519     }
 520
 521     /* check unit id */
 522
 523     if (max_devs && unit_id >= max_devs) {
 524         error_report("unit %d too big (max is %d)",
 525                      unit_id, max_devs - 1);
 526         return NULL;
 527     }
 528
 529     /*
 530      * catch multiple definitions
 531      */
 532
 533     if (drive_get(type, bus_id, unit_id) != NULL) {
 534         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 535                      bus_id, unit_id, index);
 536         return NULL;
 537     }
 538
 539     /* init */
 540
 541     dinfo = g_malloc0(sizeof(*dinfo));
 542     if ((buf = qemu_opts_id(opts)) != NULL) {
 543         dinfo->id = g_strdup(buf);
 544     } else {
 545         /* no id supplied -> create one */
 546         dinfo->id = g_malloc0(32);
 547         if (type == IF_IDE || type == IF_SCSI)
 548             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 549         if (max_devs)
 550             snprintf(dinfo->id, 32, "%s%i%s%i",
 551                      if_name[type], bus_id, mediastr, unit_id);
 552         else
 553             snprintf(dinfo->id, 32, "%s%s%i",
 554                      if_name[type], mediastr, unit_id);
 555     }
 556     dinfo->bdrv = bdrv_new(dinfo->id);
 557     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 558     dinfo->bdrv->read_only = ro;
 559     dinfo->devaddr = devaddr;
 560     dinfo->type = type;
 561     dinfo->bus = bus_id;
 562     dinfo->unit = unit_id;
 563     dinfo->cyls = cyls;
 564     dinfo->heads = heads;
 565     dinfo->secs = secs;
 566     dinfo->trans = translation;
 567     dinfo->opts = opts;
 568     dinfo->refcount = 1;
 569     dinfo->serial = serial;
 570     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 571
 572     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 573
 574     /* disk I/O throttling */
 575     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 576
 577     switch(type) {
 578     case IF_IDE:
 579     case IF_SCSI:
 580     case IF_XEN:
 581     case IF_NONE:
 582         dinfo->media_cd = media == MEDIA_CDROM;
 583         break;
 584     case IF_SD:
 585     case IF_FLOPPY:
 586     case IF_PFLASH:
 587     case IF_MTD:
 588         break;
 589     case IF_VIRTIO:
 590         /* add virtio block device */
 591         opts = qemu_opts_create_nofail(qemu_find_opts("device"));
 592         if (arch_type == QEMU_ARCH_S390X) {
 593             qemu_opt_set(opts, "driver", "virtio-blk-s390");
 594         } else {
 595             qemu_opt_set(opts, "driver", "virtio-blk-pci");
 596         }
 597         qemu_opt_set(opts, "drive", dinfo->id);
 598         if (devaddr)
 599             qemu_opt_set(opts, "addr", devaddr);
 600         break;
 601     default:
 602         abort();
 603     }
 604     if (!file || !*file) {
 605         return dinfo;
 606     }
 607     if (snapshot) {
 608         /* always use cache=unsafe with snapshot */
 609         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 610         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 611     }
 612
 613     if (copy_on_read) {
 614         bdrv_flags |= BDRV_O_COPY_ON_READ;
 615     }
 616
 617     if (runstate_check(RUN_STATE_INMIGRATE)) {
 618         bdrv_flags |= BDRV_O_INCOMING;
 619     }
 620
 621     if (media == MEDIA_CDROM) {
 622         /* CDROM is fine for any interface, don't check.  */
 623         ro = 1;
 624     } else if (ro == 1) {
 625         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 626             type != IF_NONE && type != IF_PFLASH) {
 627             error_report("readonly not supported by this bus type");
 628             goto err;
 629         }
 630     }
 631
 632     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 633
 634     if (ro && copy_on_read) {
 635         error_report("warning: disabling copy_on_read on readonly drive");
 636     }
 637
 638     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 639     if (ret < 0) {
 640         if (ret == -EMEDIUMTYPE) {
 641             error_report("could not open disk image %s: not in %s format",
 642                          file, drv->format_name);
 643         } else {
 644             error_report("could not open disk image %s: %s",
 645                          file, strerror(-ret));
 646         }
 647         goto err;
 648     }
 649
 650     if (bdrv_key_required(dinfo->bdrv))
 651         autostart = 0;
 652     return dinfo;
 653
 654 err:
 655     bdrv_delete(dinfo->bdrv);
 656     g_free(dinfo->id);
 657     QTAILQ_REMOVE(&drives, dinfo, next);
 658     g_free(dinfo);
 659     return NULL;
 660 }
 661
 662 void do_commit(Monitor *mon, const QDict *qdict)
 663 {
 664     const char *device = qdict_get_str(qdict, "device");
 665     BlockDriverState *bs;
 666     int ret;
 667
 668     if (!strcmp(device, "all")) {
 669         ret = bdrv_commit_all();
 670     } else {
 671         bs = bdrv_find(device);
 672         if (!bs) {
 673             monitor_printf(mon, "Device '%s' not found\n", device);
 674             return;
 675         }
 676         ret = bdrv_commit(bs);
 677     }
 678     if (ret < 0) {
 679         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 680                        strerror(-ret));
 681     }
 682 }
 683
 684 static void blockdev_do_action(int kind, void *data, Error **errp)
 685 {
 686     BlockdevAction action;
 687     BlockdevActionList list;
 688
 689     action.kind = kind;
 690     action.data = data;
 691     list.value = &action;
 692     list.next = NULL;
 693     qmp_transaction(&list, errp);
 694 }
 695
 696 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 697                                 bool has_format, const char *format,
 698                                 bool has_mode, enum NewImageMode mode,
 699                                 Error **errp)
 700 {
 701     BlockdevSnapshot snapshot = {
 702         .device = (char *) device,
 703         .snapshot_file = (char *) snapshot_file,
 704         .has_format = has_format,
 705         .format = (char *) format,
 706         .has_mode = has_mode,
 707         .mode = mode,
 708     };
 709     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 710                        errp);
 711 }
 712
 713
 714 /* New and old BlockDriverState structs for group snapshots */
 715 typedef struct BlkTransactionStates {
 716     BlockDriverState *old_bs;
 717     BlockDriverState *new_bs;
 718     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 719 } BlkTransactionStates;
 720
 721 /*
 722  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 723  *  then we do not pivot any of the devices in the group, and abandon the
 724  *  snapshots
 725  */
 726 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 727 {
 728     int ret = 0;
 729     BlockdevActionList *dev_entry = dev_list;
 730     BlkTransactionStates *states, *next;
 731     Error *local_err = NULL;
 732
 733     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 734     QSIMPLEQ_INIT(&snap_bdrv_states);
 735
 736     /* drain all i/o before any snapshots */
 737     bdrv_drain_all();
 738
 739     /* We don't do anything in this loop that commits us to the snapshot */
 740     while (NULL != dev_entry) {
 741         BlockdevAction *dev_info = NULL;
 742         BlockDriver *proto_drv;
 743         BlockDriver *drv;
 744         int flags;
 745         enum NewImageMode mode;
 746         const char *new_image_file;
 747         const char *device;
 748         const char *format = "qcow2";
 749
 750         dev_info = dev_entry->value;
 751         dev_entry = dev_entry->next;
 752
 753         states = g_malloc0(sizeof(BlkTransactionStates));
 754         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 755
 756         switch (dev_info->kind) {
 757         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 758             device = dev_info->blockdev_snapshot_sync->device;
 759             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 760                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 761             }
 762             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 763             if (dev_info->blockdev_snapshot_sync->has_format) {
 764                 format = dev_info->blockdev_snapshot_sync->format;
 765             }
 766             mode = dev_info->blockdev_snapshot_sync->mode;
 767             break;
 768         default:
 769             abort();
 770         }
 771
 772         drv = bdrv_find_format(format);
 773         if (!drv) {
 774             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 775             goto delete_and_fail;
 776         }
 777
 778         states->old_bs = bdrv_find(device);
 779         if (!states->old_bs) {
 780             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 781             goto delete_and_fail;
 782         }
 783
 784         if (!bdrv_is_inserted(states->old_bs)) {
 785             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 786             goto delete_and_fail;
 787         }
 788
 789         if (bdrv_in_use(states->old_bs)) {
 790             error_set(errp, QERR_DEVICE_IN_USE, device);
 791             goto delete_and_fail;
 792         }
 793
 794         if (!bdrv_is_read_only(states->old_bs)) {
 795             if (bdrv_flush(states->old_bs)) {
 796                 error_set(errp, QERR_IO_ERROR);
 797                 goto delete_and_fail;
 798             }
 799         }
 800
 801         flags = states->old_bs->open_flags;
 802
 803         proto_drv = bdrv_find_protocol(new_image_file);
 804         if (!proto_drv) {
 805             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 806             goto delete_and_fail;
 807         }
 808
 809         /* create new image w/backing file */
 810         if (mode != NEW_IMAGE_MODE_EXISTING) {
 811             bdrv_img_create(new_image_file, format,
 812                             states->old_bs->filename,
 813                             states->old_bs->drv->format_name,
 814                             NULL, -1, flags, &local_err, false);
 815             if (error_is_set(&local_err)) {
 816                 error_propagate(errp, local_err);
 817                 goto delete_and_fail;
 818             }
 819         }
 820
 821         /* We will manually add the backing_hd field to the bs later */
 822         states->new_bs = bdrv_new("");
 823         ret = bdrv_open(states->new_bs, new_image_file,
 824                         flags | BDRV_O_NO_BACKING, drv);
 825         if (ret != 0) {
 826             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 827             goto delete_and_fail;
 828         }
 829     }
 830
 831
 832     /* Now we are going to do the actual pivot.  Everything up to this point
 833      * is reversible, but we are committed at this point */
 834     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 835         /* This removes our old bs from the bdrv_states, and adds the new bs */
 836         bdrv_append(states->new_bs, states->old_bs);
 837         /* We don't need (or want) to use the transactional
 838          * bdrv_reopen_multiple() across all the entries at once, because we
 839          * don't want to abort all of them if one of them fails the reopen */
 840         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 841                     NULL);
 842     }
 843
 844     /* success */
 845     goto exit;
 846
 847 delete_and_fail:
 848     /*
 849     * failure, and it is all-or-none; abandon each new bs, and keep using
 850     * the original bs for all images
 851     */
 852     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 853         if (states->new_bs) {
 854              bdrv_delete(states->new_bs);
 855         }
 856     }
 857 exit:
 858     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 859         g_free(states);
 860     }
 861 }
 862
 863
 864 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 865 {
 866     if (bdrv_in_use(bs)) {
 867         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 868         return;
 869     }
 870     if (!bdrv_dev_has_removable_media(bs)) {
 871         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 872         return;
 873     }
 874
 875     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 876         bdrv_dev_eject_request(bs, force);
 877         if (!force) {
 878             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 879             return;
 880         }
 881     }
 882
 883     bdrv_close(bs);
 884 }
 885
 886 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 887 {
 888     BlockDriverState *bs;
 889
 890     bs = bdrv_find(device);
 891     if (!bs) {
 892         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 893         return;
 894     }
 895
 896     eject_device(bs, force, errp);
 897 }
 898
 899 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 900 {
 901     BlockDriverState *bs;
 902     int err;
 903
 904     bs = bdrv_find(device);
 905     if (!bs) {
 906         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 907         return;
 908     }
 909
 910     err = bdrv_set_key(bs, password);
 911     if (err == -EINVAL) {
 912         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 913         return;
 914     } else if (err < 0) {
 915         error_set(errp, QERR_INVALID_PASSWORD);
 916         return;
 917     }
 918 }
 919
 920 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 921                                     int bdrv_flags, BlockDriver *drv,
 922                                     const char *password, Error **errp)
 923 {
 924     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 925         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 926         return;
 927     }
 928
 929     if (bdrv_key_required(bs)) {
 930         if (password) {
 931             if (bdrv_set_key(bs, password) < 0) {
 932                 error_set(errp, QERR_INVALID_PASSWORD);
 933             }
 934         } else {
 935             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 936                       bdrv_get_encrypted_filename(bs));
 937         }
 938     } else if (password) {
 939         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 940     }
 941 }
 942
 943 void qmp_change_blockdev(const char *device, const char *filename,
 944                          bool has_format, const char *format, Error **errp)
 945 {
 946     BlockDriverState *bs;
 947     BlockDriver *drv = NULL;
 948     int bdrv_flags;
 949     Error *err = NULL;
 950
 951     bs = bdrv_find(device);
 952     if (!bs) {
 953         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 954         return;
 955     }
 956
 957     if (format) {
 958         drv = bdrv_find_whitelisted_format(format);
 959         if (!drv) {
 960             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 961             return;
 962         }
 963     }
 964
 965     eject_device(bs, 0, &err);
 966     if (error_is_set(&err)) {
 967         error_propagate(errp, err);
 968         return;
 969     }
 970
 971     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 972     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 973
 974     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 975 }
 976
 977 /* throttling disk I/O limits */
 978 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 979                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 980                                int64_t iops_wr, Error **errp)
 981 {
 982     BlockIOLimit io_limits;
 983     BlockDriverState *bs;
 984
 985     bs = bdrv_find(device);
 986     if (!bs) {
 987         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 988         return;
 989     }
 990
 991     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 992     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 993     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 994     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 995     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 996     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 997
 998     if (!do_check_io_limits(&io_limits, errp)) {
 999         return;
1000     }
1001
1002     bs->io_limits = io_limits;
1003     bs->slice_time = BLOCK_IO_SLICE_TIME;
1004
1005     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
1006         bdrv_io_limits_enable(bs);
1007     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
1008         bdrv_io_limits_disable(bs);
1009     } else {
1010         if (bs->block_timer) {
1011             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
1012         }
1013     }
1014 }
1015
1016 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1017 {
1018     const char *id = qdict_get_str(qdict, "id");
1019     BlockDriverState *bs;
1020
1021     bs = bdrv_find(id);
1022     if (!bs) {
1023         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1024         return -1;
1025     }
1026     if (bdrv_in_use(bs)) {
1027         qerror_report(QERR_DEVICE_IN_USE, id);
1028         return -1;
1029     }
1030
1031     /* quiesce block driver; prevent further io */
1032     bdrv_drain_all();
1033     bdrv_flush(bs);
1034     bdrv_close(bs);
1035
1036     /* if we have a device attached to this BlockDriverState
1037      * then we need to make the drive anonymous until the device
1038      * can be removed.  If this is a drive with no device backing
1039      * then we can just get rid of the block driver state right here.
1040      */
1041     if (bdrv_get_attached_dev(bs)) {
1042         bdrv_make_anon(bs);
1043     } else {
1044         drive_uninit(drive_get_by_blockdev(bs));
1045     }
1046
1047     return 0;
1048 }
1049
1050 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1051 {
1052     BlockDriverState *bs;
1053
1054     bs = bdrv_find(device);
1055     if (!bs) {
1056         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1057         return;
1058     }
1059
1060     if (size < 0) {
1061         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1062         return;
1063     }
1064
1065     switch (bdrv_truncate(bs, size)) {
1066     case 0:
1067         break;
1068     case -ENOMEDIUM:
1069         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1070         break;
1071     case -ENOTSUP:
1072         error_set(errp, QERR_UNSUPPORTED);
1073         break;
1074     case -EACCES:
1075         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1076         break;
1077     case -EBUSY:
1078         error_set(errp, QERR_DEVICE_IN_USE, device);
1079         break;
1080     default:
1081         error_set(errp, QERR_UNDEFINED_ERROR);
1082         break;
1083     }
1084 }
1085
1086 static void block_job_cb(void *opaque, int ret)
1087 {
1088     BlockDriverState *bs = opaque;
1089     QObject *obj;
1090
1091     trace_block_job_cb(bs, bs->job, ret);
1092
1093     assert(bs->job);
1094     obj = qobject_from_block_job(bs->job);
1095     if (ret < 0) {
1096         QDict *dict = qobject_to_qdict(obj);
1097         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1098     }
1099
1100     if (block_job_is_cancelled(bs->job)) {
1101         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1102     } else {
1103         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1104     }
1105     qobject_decref(obj);
1106
1107     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1108 }
1109
1110 void qmp_block_stream(const char *device, bool has_base,
1111                       const char *base, bool has_speed, int64_t speed,
1112                       bool has_on_error, BlockdevOnError on_error,
1113                       Error **errp)
1114 {
1115     BlockDriverState *bs;
1116     BlockDriverState *base_bs = NULL;
1117     Error *local_err = NULL;
1118
1119     if (!has_on_error) {
1120         on_error = BLOCKDEV_ON_ERROR_REPORT;
1121     }
1122
1123     bs = bdrv_find(device);
1124     if (!bs) {
1125         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1126         return;
1127     }
1128
1129     if (base) {
1130         base_bs = bdrv_find_backing_image(bs, base);
1131         if (base_bs == NULL) {
1132             error_set(errp, QERR_BASE_NOT_FOUND, base);
1133             return;
1134         }
1135     }
1136
1137     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1138                  on_error, block_job_cb, bs, &local_err);
1139     if (error_is_set(&local_err)) {
1140         error_propagate(errp, local_err);
1141         return;
1142     }
1143
1144     /* Grab a reference so hotplug does not delete the BlockDriverState from
1145      * underneath us.
1146      */
1147     drive_get_ref(drive_get_by_blockdev(bs));
1148
1149     trace_qmp_block_stream(bs, bs->job);
1150 }
1151
1152 void qmp_block_commit(const char *device,
1153                       bool has_base, const char *base, const char *top,
1154                       bool has_speed, int64_t speed,
1155                       Error **errp)
1156 {
1157     BlockDriverState *bs;
1158     BlockDriverState *base_bs, *top_bs;
1159     Error *local_err = NULL;
1160     /* This will be part of the QMP command, if/when the
1161      * BlockdevOnError change for blkmirror makes it in
1162      */
1163     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1164
1165     /* drain all i/o before commits */
1166     bdrv_drain_all();
1167
1168     bs = bdrv_find(device);
1169     if (!bs) {
1170         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1171         return;
1172     }
1173
1174     /* default top_bs is the active layer */
1175     top_bs = bs;
1176
1177     if (top) {
1178         if (strcmp(bs->filename, top) != 0) {
1179             top_bs = bdrv_find_backing_image(bs, top);
1180         }
1181     }
1182
1183     if (top_bs == NULL) {
1184         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1185         return;
1186     }
1187
1188     if (has_base && base) {
1189         base_bs = bdrv_find_backing_image(top_bs, base);
1190     } else {
1191         base_bs = bdrv_find_base(top_bs);
1192     }
1193
1194     if (base_bs == NULL) {
1195         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1196         return;
1197     }
1198
1199     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1200                 &local_err);
1201     if (local_err != NULL) {
1202         error_propagate(errp, local_err);
1203         return;
1204     }
1205     /* Grab a reference so hotplug does not delete the BlockDriverState from
1206      * underneath us.
1207      */
1208     drive_get_ref(drive_get_by_blockdev(bs));
1209 }
1210
1211 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1212
1213 void qmp_drive_mirror(const char *device, const char *target,
1214                       bool has_format, const char *format,
1215                       enum MirrorSyncMode sync,
1216                       bool has_mode, enum NewImageMode mode,
1217                       bool has_speed, int64_t speed,
1218                       bool has_granularity, uint32_t granularity,
1219                       bool has_buf_size, int64_t buf_size,
1220                       bool has_on_source_error, BlockdevOnError on_source_error,
1221                       bool has_on_target_error, BlockdevOnError on_target_error,
1222                       Error **errp)
1223 {
1224     BlockDriverState *bs;
1225     BlockDriverState *source, *target_bs;
1226     BlockDriver *proto_drv;
1227     BlockDriver *drv = NULL;
1228     Error *local_err = NULL;
1229     int flags;
1230     uint64_t size;
1231     int ret;
1232
1233     if (!has_speed) {
1234         speed = 0;
1235     }
1236     if (!has_on_source_error) {
1237         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1238     }
1239     if (!has_on_target_error) {
1240         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1241     }
1242     if (!has_mode) {
1243         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1244     }
1245     if (!has_granularity) {
1246         granularity = 0;
1247     }
1248     if (!has_buf_size) {
1249         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1250     }
1251
1252     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1253         error_set(errp, QERR_INVALID_PARAMETER, device);
1254         return;
1255     }
1256     if (granularity & (granularity - 1)) {
1257         error_set(errp, QERR_INVALID_PARAMETER, device);
1258         return;
1259     }
1260
1261     bs = bdrv_find(device);
1262     if (!bs) {
1263         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1264         return;
1265     }
1266
1267     if (!bdrv_is_inserted(bs)) {
1268         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1269         return;
1270     }
1271
1272     if (!has_format) {
1273         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1274     }
1275     if (format) {
1276         drv = bdrv_find_format(format);
1277         if (!drv) {
1278             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1279             return;
1280         }
1281     }
1282
1283     if (bdrv_in_use(bs)) {
1284         error_set(errp, QERR_DEVICE_IN_USE, device);
1285         return;
1286     }
1287
1288     flags = bs->open_flags | BDRV_O_RDWR;
1289     source = bs->backing_hd;
1290     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1291         sync = MIRROR_SYNC_MODE_FULL;
1292     }
1293
1294     proto_drv = bdrv_find_protocol(target);
1295     if (!proto_drv) {
1296         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1297         return;
1298     }
1299
1300     bdrv_get_geometry(bs, &size);
1301     size *= 512;
1302     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1303         /* create new image w/o backing file */
1304         assert(format && drv);
1305         bdrv_img_create(target, format,
1306                         NULL, NULL, NULL, size, flags, &local_err, false);
1307     } else {
1308         switch (mode) {
1309         case NEW_IMAGE_MODE_EXISTING:
1310             ret = 0;
1311             break;
1312         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1313             /* create new image with backing file */
1314             bdrv_img_create(target, format,
1315                             source->filename,
1316                             source->drv->format_name,
1317                             NULL, size, flags, &local_err, false);
1318             break;
1319         default:
1320             abort();
1321         }
1322     }
1323
1324     if (error_is_set(&local_err)) {
1325         error_propagate(errp, local_err);
1326         return;
1327     }
1328
1329     /* Mirroring takes care of copy-on-write using the source's backing
1330      * file.
1331      */
1332     target_bs = bdrv_new("");
1333     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1334
1335     if (ret < 0) {
1336         bdrv_delete(target_bs);
1337         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1338         return;
1339     }
1340
1341     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1342                  on_source_error, on_target_error,
1343                  block_job_cb, bs, &local_err);
1344     if (local_err != NULL) {
1345         bdrv_delete(target_bs);
1346         error_propagate(errp, local_err);
1347         return;
1348     }
1349
1350     /* Grab a reference so hotplug does not delete the BlockDriverState from
1351      * underneath us.
1352      */
1353     drive_get_ref(drive_get_by_blockdev(bs));
1354 }
1355
1356 static BlockJob *find_block_job(const char *device)
1357 {
1358     BlockDriverState *bs;
1359
1360     bs = bdrv_find(device);
1361     if (!bs || !bs->job) {
1362         return NULL;
1363     }
1364     return bs->job;
1365 }
1366
1367 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1368 {
1369     BlockJob *job = find_block_job(device);
1370
1371     if (!job) {
1372         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1373         return;
1374     }
1375
1376     block_job_set_speed(job, speed, errp);
1377 }
1378
1379 void qmp_block_job_cancel(const char *device,
1380                           bool has_force, bool force, Error **errp)
1381 {
1382     BlockJob *job = find_block_job(device);
1383
1384     if (!has_force) {
1385         force = false;
1386     }
1387
1388     if (!job) {
1389         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1390         return;
1391     }
1392     if (job->paused && !force) {
1393         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1394         return;
1395     }
1396
1397     trace_qmp_block_job_cancel(job);
1398     block_job_cancel(job);
1399 }
1400
1401 void qmp_block_job_pause(const char *device, Error **errp)
1402 {
1403     BlockJob *job = find_block_job(device);
1404
1405     if (!job) {
1406         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1407         return;
1408     }
1409
1410     trace_qmp_block_job_pause(job);
1411     block_job_pause(job);
1412 }
1413
1414 void qmp_block_job_resume(const char *device, Error **errp)
1415 {
1416     BlockJob *job = find_block_job(device);
1417
1418     if (!job) {
1419         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1420         return;
1421     }
1422
1423     trace_qmp_block_job_resume(job);
1424     block_job_resume(job);
1425 }
1426
1427 void qmp_block_job_complete(const char *device, Error **errp)
1428 {
1429     BlockJob *job = find_block_job(device);
1430
1431     if (!job) {
1432         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1433         return;
1434     }
1435
1436     trace_qmp_block_job_complete(job);
1437     block_job_complete(job, errp);
1438 }
1439
1440 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1441 {
1442     BlockJobInfoList **prev = opaque;
1443     BlockJob *job = bs->job;
1444
1445     if (job) {
1446         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1447         elem->value = block_job_query(bs->job);
1448         (*prev)->next = elem;
1449         *prev = elem;
1450     }
1451 }
1452
1453 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1454 {
1455     /* Dummy is a fake list element for holding the head pointer */
1456     BlockJobInfoList dummy = {};
1457     BlockJobInfoList *prev = &dummy;
1458     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1459     return dummy.next;
1460 }
1461
1462 QemuOptsList qemu_drive_opts = {
1463     .name = "drive",
1464     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1465     .desc = {
1466         {
1467             .name = "bus",
1468             .type = QEMU_OPT_NUMBER,
1469             .help = "bus number",
1470         },{
1471             .name = "unit",
1472             .type = QEMU_OPT_NUMBER,
1473             .help = "unit number (i.e. lun for scsi)",
1474         },{
1475             .name = "if",
1476             .type = QEMU_OPT_STRING,
1477             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1478         },{
1479             .name = "index",
1480             .type = QEMU_OPT_NUMBER,
1481             .help = "index number",
1482         },{
1483             .name = "cyls",
1484             .type = QEMU_OPT_NUMBER,
1485             .help = "number of cylinders (ide disk geometry)",
1486         },{
1487             .name = "heads",
1488             .type = QEMU_OPT_NUMBER,
1489             .help = "number of heads (ide disk geometry)",
1490         },{
1491             .name = "secs",
1492             .type = QEMU_OPT_NUMBER,
1493             .help = "number of sectors (ide disk geometry)",
1494         },{
1495             .name = "trans",
1496             .type = QEMU_OPT_STRING,
1497             .help = "chs translation (auto, lba. none)",
1498         },{
1499             .name = "media",
1500             .type = QEMU_OPT_STRING,
1501             .help = "media type (disk, cdrom)",
1502         },{
1503             .name = "snapshot",
1504             .type = QEMU_OPT_BOOL,
1505             .help = "enable/disable snapshot mode",
1506         },{
1507             .name = "file",
1508             .type = QEMU_OPT_STRING,
1509             .help = "disk image",
1510         },{
1511             .name = "discard",
1512             .type = QEMU_OPT_STRING,
1513             .help = "discard operation (ignore/off, unmap/on)",
1514         },{
1515             .name = "cache",
1516             .type = QEMU_OPT_STRING,
1517             .help = "host cache usage (none, writeback, writethrough, "
1518                     "directsync, unsafe)",
1519         },{
1520             .name = "aio",
1521             .type = QEMU_OPT_STRING,
1522             .help = "host AIO implementation (threads, native)",
1523         },{
1524             .name = "format",
1525             .type = QEMU_OPT_STRING,
1526             .help = "disk format (raw, qcow2, ...)",
1527         },{
1528             .name = "serial",
1529             .type = QEMU_OPT_STRING,
1530             .help = "disk serial number",
1531         },{
1532             .name = "rerror",
1533             .type = QEMU_OPT_STRING,
1534             .help = "read error action",
1535         },{
1536             .name = "werror",
1537             .type = QEMU_OPT_STRING,
1538             .help = "write error action",
1539         },{
1540             .name = "addr",
1541             .type = QEMU_OPT_STRING,
1542             .help = "pci address (virtio only)",
1543         },{
1544             .name = "readonly",
1545             .type = QEMU_OPT_BOOL,
1546             .help = "open drive file as read-only",
1547         },{
1548             .name = "iops",
1549             .type = QEMU_OPT_NUMBER,
1550             .help = "limit total I/O operations per second",
1551         },{
1552             .name = "iops_rd",
1553             .type = QEMU_OPT_NUMBER,
1554             .help = "limit read operations per second",
1555         },{
1556             .name = "iops_wr",
1557             .type = QEMU_OPT_NUMBER,
1558             .help = "limit write operations per second",
1559         },{
1560             .name = "bps",
1561             .type = QEMU_OPT_NUMBER,
1562             .help = "limit total bytes per second",
1563         },{
1564             .name = "bps_rd",
1565             .type = QEMU_OPT_NUMBER,
1566             .help = "limit read bytes per second",
1567         },{
1568             .name = "bps_wr",
1569             .type = QEMU_OPT_NUMBER,
1570             .help = "limit write bytes per second",
1571         },{
1572             .name = "copy-on-read",
1573             .type = QEMU_OPT_BOOL,
1574             .help = "copy read data from backing file into image file",
1575         },{
1576             .name = "boot",
1577             .type = QEMU_OPT_BOOL,
1578             .help = "(deprecated, ignored)",
1579         },
1580         { /* end of list */ }
1581     },
1582 };