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         if (ret == -EMEDIUMTYPE) {
 621             error_report("could not open disk image %s: not in %s format",
 622                          file, drv->format_name);
 623         } else {
 624             error_report("could not open disk image %s: %s",
 625                          file, strerror(-ret));
 626         }
 627         goto err;
 628     }
 629
 630     if (bdrv_key_required(dinfo->bdrv))
 631         autostart = 0;
 632     return dinfo;
 633
 634 err:
 635     bdrv_delete(dinfo->bdrv);
 636     g_free(dinfo->id);
 637     QTAILQ_REMOVE(&drives, dinfo, next);
 638     g_free(dinfo);
 639     return NULL;
 640 }
 641
 642 void do_commit(Monitor *mon, const QDict *qdict)
 643 {
 644     const char *device = qdict_get_str(qdict, "device");
 645     BlockDriverState *bs;
 646     int ret;
 647
 648     if (!strcmp(device, "all")) {
 649         ret = bdrv_commit_all();
 650     } else {
 651         bs = bdrv_find(device);
 652         if (!bs) {
 653             monitor_printf(mon, "Device '%s' not found\n", device);
 654             return;
 655         }
 656         ret = bdrv_commit(bs);
 657     }
 658     if (ret < 0) {
 659         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 660                        strerror(-ret));
 661     }
 662 }
 663
 664 static void blockdev_do_action(int kind, void *data, Error **errp)
 665 {
 666     BlockdevAction action;
 667     BlockdevActionList list;
 668
 669     action.kind = kind;
 670     action.data = data;
 671     list.value = &action;
 672     list.next = NULL;
 673     qmp_transaction(&list, errp);
 674 }
 675
 676 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 677                                 bool has_format, const char *format,
 678                                 bool has_mode, enum NewImageMode mode,
 679                                 Error **errp)
 680 {
 681     BlockdevSnapshot snapshot = {
 682         .device = (char *) device,
 683         .snapshot_file = (char *) snapshot_file,
 684         .has_format = has_format,
 685         .format = (char *) format,
 686         .has_mode = has_mode,
 687         .mode = mode,
 688     };
 689     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 690                        errp);
 691 }
 692
 693
 694 /* New and old BlockDriverState structs for group snapshots */
 695 typedef struct BlkTransactionStates {
 696     BlockDriverState *old_bs;
 697     BlockDriverState *new_bs;
 698     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 699 } BlkTransactionStates;
 700
 701 /*
 702  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 703  *  then we do not pivot any of the devices in the group, and abandon the
 704  *  snapshots
 705  */
 706 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 707 {
 708     int ret = 0;
 709     BlockdevActionList *dev_entry = dev_list;
 710     BlkTransactionStates *states, *next;
 711     Error *local_err = NULL;
 712
 713     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 714     QSIMPLEQ_INIT(&snap_bdrv_states);
 715
 716     /* drain all i/o before any snapshots */
 717     bdrv_drain_all();
 718
 719     /* We don't do anything in this loop that commits us to the snapshot */
 720     while (NULL != dev_entry) {
 721         BlockdevAction *dev_info = NULL;
 722         BlockDriver *proto_drv;
 723         BlockDriver *drv;
 724         int flags;
 725         enum NewImageMode mode;
 726         const char *new_image_file;
 727         const char *device;
 728         const char *format = "qcow2";
 729
 730         dev_info = dev_entry->value;
 731         dev_entry = dev_entry->next;
 732
 733         states = g_malloc0(sizeof(BlkTransactionStates));
 734         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 735
 736         switch (dev_info->kind) {
 737         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 738             device = dev_info->blockdev_snapshot_sync->device;
 739             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 740                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 741             }
 742             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 743             if (dev_info->blockdev_snapshot_sync->has_format) {
 744                 format = dev_info->blockdev_snapshot_sync->format;
 745             }
 746             mode = dev_info->blockdev_snapshot_sync->mode;
 747             break;
 748         default:
 749             abort();
 750         }
 751
 752         drv = bdrv_find_format(format);
 753         if (!drv) {
 754             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 755             goto delete_and_fail;
 756         }
 757
 758         states->old_bs = bdrv_find(device);
 759         if (!states->old_bs) {
 760             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 761             goto delete_and_fail;
 762         }
 763
 764         if (!bdrv_is_inserted(states->old_bs)) {
 765             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 766             goto delete_and_fail;
 767         }
 768
 769         if (bdrv_in_use(states->old_bs)) {
 770             error_set(errp, QERR_DEVICE_IN_USE, device);
 771             goto delete_and_fail;
 772         }
 773
 774         if (!bdrv_is_read_only(states->old_bs)) {
 775             if (bdrv_flush(states->old_bs)) {
 776                 error_set(errp, QERR_IO_ERROR);
 777                 goto delete_and_fail;
 778             }
 779         }
 780
 781         flags = states->old_bs->open_flags;
 782
 783         proto_drv = bdrv_find_protocol(new_image_file);
 784         if (!proto_drv) {
 785             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 786             goto delete_and_fail;
 787         }
 788
 789         /* create new image w/backing file */
 790         if (mode != NEW_IMAGE_MODE_EXISTING) {
 791             bdrv_img_create(new_image_file, format,
 792                             states->old_bs->filename,
 793                             states->old_bs->drv->format_name,
 794                             NULL, -1, flags, &local_err);
 795             if (error_is_set(&local_err)) {
 796                 error_propagate(errp, local_err);
 797                 goto delete_and_fail;
 798             }
 799         }
 800
 801         /* We will manually add the backing_hd field to the bs later */
 802         states->new_bs = bdrv_new("");
 803         ret = bdrv_open(states->new_bs, new_image_file,
 804                         flags | BDRV_O_NO_BACKING, drv);
 805         if (ret != 0) {
 806             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 807             goto delete_and_fail;
 808         }
 809     }
 810
 811
 812     /* Now we are going to do the actual pivot.  Everything up to this point
 813      * is reversible, but we are committed at this point */
 814     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 815         /* This removes our old bs from the bdrv_states, and adds the new bs */
 816         bdrv_append(states->new_bs, states->old_bs);
 817         /* We don't need (or want) to use the transactional
 818          * bdrv_reopen_multiple() across all the entries at once, because we
 819          * don't want to abort all of them if one of them fails the reopen */
 820         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 821                     NULL);
 822     }
 823
 824     /* success */
 825     goto exit;
 826
 827 delete_and_fail:
 828     /*
 829     * failure, and it is all-or-none; abandon each new bs, and keep using
 830     * the original bs for all images
 831     */
 832     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 833         if (states->new_bs) {
 834              bdrv_delete(states->new_bs);
 835         }
 836     }
 837 exit:
 838     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 839         g_free(states);
 840     }
 841 }
 842
 843
 844 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 845 {
 846     if (bdrv_in_use(bs)) {
 847         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 848         return;
 849     }
 850     if (!bdrv_dev_has_removable_media(bs)) {
 851         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 852         return;
 853     }
 854
 855     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 856         bdrv_dev_eject_request(bs, force);
 857         if (!force) {
 858             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 859             return;
 860         }
 861     }
 862
 863     bdrv_close(bs);
 864 }
 865
 866 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 867 {
 868     BlockDriverState *bs;
 869
 870     bs = bdrv_find(device);
 871     if (!bs) {
 872         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 873         return;
 874     }
 875
 876     eject_device(bs, force, errp);
 877 }
 878
 879 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 880 {
 881     BlockDriverState *bs;
 882     int err;
 883
 884     bs = bdrv_find(device);
 885     if (!bs) {
 886         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 887         return;
 888     }
 889
 890     err = bdrv_set_key(bs, password);
 891     if (err == -EINVAL) {
 892         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 893         return;
 894     } else if (err < 0) {
 895         error_set(errp, QERR_INVALID_PASSWORD);
 896         return;
 897     }
 898 }
 899
 900 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 901                                     int bdrv_flags, BlockDriver *drv,
 902                                     const char *password, Error **errp)
 903 {
 904     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 905         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 906         return;
 907     }
 908
 909     if (bdrv_key_required(bs)) {
 910         if (password) {
 911             if (bdrv_set_key(bs, password) < 0) {
 912                 error_set(errp, QERR_INVALID_PASSWORD);
 913             }
 914         } else {
 915             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 916                       bdrv_get_encrypted_filename(bs));
 917         }
 918     } else if (password) {
 919         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 920     }
 921 }
 922
 923 void qmp_change_blockdev(const char *device, const char *filename,
 924                          bool has_format, const char *format, Error **errp)
 925 {
 926     BlockDriverState *bs;
 927     BlockDriver *drv = NULL;
 928     int bdrv_flags;
 929     Error *err = NULL;
 930
 931     bs = bdrv_find(device);
 932     if (!bs) {
 933         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 934         return;
 935     }
 936
 937     if (format) {
 938         drv = bdrv_find_whitelisted_format(format);
 939         if (!drv) {
 940             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 941             return;
 942         }
 943     }
 944
 945     eject_device(bs, 0, &err);
 946     if (error_is_set(&err)) {
 947         error_propagate(errp, err);
 948         return;
 949     }
 950
 951     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 952     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 953
 954     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 955 }
 956
 957 /* throttling disk I/O limits */
 958 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 959                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 960                                int64_t iops_wr, Error **errp)
 961 {
 962     BlockIOLimit io_limits;
 963     BlockDriverState *bs;
 964
 965     bs = bdrv_find(device);
 966     if (!bs) {
 967         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 968         return;
 969     }
 970
 971     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 972     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 973     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 974     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 975     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 976     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 977
 978     if (!do_check_io_limits(&io_limits)) {
 979         error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
 980         return;
 981     }
 982
 983     bs->io_limits = io_limits;
 984     bs->slice_time = BLOCK_IO_SLICE_TIME;
 985
 986     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 987         bdrv_io_limits_enable(bs);
 988     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 989         bdrv_io_limits_disable(bs);
 990     } else {
 991         if (bs->block_timer) {
 992             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 993         }
 994     }
 995 }
 996
 997 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 998 {
 999     const char *id = qdict_get_str(qdict, "id");
1000     BlockDriverState *bs;
1001
1002     bs = bdrv_find(id);
1003     if (!bs) {
1004         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1005         return -1;
1006     }
1007     if (bdrv_in_use(bs)) {
1008         qerror_report(QERR_DEVICE_IN_USE, id);
1009         return -1;
1010     }
1011
1012     /* quiesce block driver; prevent further io */
1013     bdrv_drain_all();
1014     bdrv_flush(bs);
1015     bdrv_close(bs);
1016
1017     /* if we have a device attached to this BlockDriverState
1018      * then we need to make the drive anonymous until the device
1019      * can be removed.  If this is a drive with no device backing
1020      * then we can just get rid of the block driver state right here.
1021      */
1022     if (bdrv_get_attached_dev(bs)) {
1023         bdrv_make_anon(bs);
1024     } else {
1025         drive_uninit(drive_get_by_blockdev(bs));
1026     }
1027
1028     return 0;
1029 }
1030
1031 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1032 {
1033     BlockDriverState *bs;
1034
1035     bs = bdrv_find(device);
1036     if (!bs) {
1037         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1038         return;
1039     }
1040
1041     if (size < 0) {
1042         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1043         return;
1044     }
1045
1046     switch (bdrv_truncate(bs, size)) {
1047     case 0:
1048         break;
1049     case -ENOMEDIUM:
1050         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1051         break;
1052     case -ENOTSUP:
1053         error_set(errp, QERR_UNSUPPORTED);
1054         break;
1055     case -EACCES:
1056         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1057         break;
1058     case -EBUSY:
1059         error_set(errp, QERR_DEVICE_IN_USE, device);
1060         break;
1061     default:
1062         error_set(errp, QERR_UNDEFINED_ERROR);
1063         break;
1064     }
1065 }
1066
1067 static void block_job_cb(void *opaque, int ret)
1068 {
1069     BlockDriverState *bs = opaque;
1070     QObject *obj;
1071
1072     trace_block_job_cb(bs, bs->job, ret);
1073
1074     assert(bs->job);
1075     obj = qobject_from_block_job(bs->job);
1076     if (ret < 0) {
1077         QDict *dict = qobject_to_qdict(obj);
1078         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1079     }
1080
1081     if (block_job_is_cancelled(bs->job)) {
1082         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1083     } else {
1084         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1085     }
1086     qobject_decref(obj);
1087
1088     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1089 }
1090
1091 void qmp_block_stream(const char *device, bool has_base,
1092                       const char *base, bool has_speed, int64_t speed,
1093                       bool has_on_error, BlockdevOnError on_error,
1094                       Error **errp)
1095 {
1096     BlockDriverState *bs;
1097     BlockDriverState *base_bs = NULL;
1098     Error *local_err = NULL;
1099
1100     if (!has_on_error) {
1101         on_error = BLOCKDEV_ON_ERROR_REPORT;
1102     }
1103
1104     bs = bdrv_find(device);
1105     if (!bs) {
1106         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1107         return;
1108     }
1109
1110     if (base) {
1111         base_bs = bdrv_find_backing_image(bs, base);
1112         if (base_bs == NULL) {
1113             error_set(errp, QERR_BASE_NOT_FOUND, base);
1114             return;
1115         }
1116     }
1117
1118     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1119                  on_error, block_job_cb, bs, &local_err);
1120     if (error_is_set(&local_err)) {
1121         error_propagate(errp, local_err);
1122         return;
1123     }
1124
1125     /* Grab a reference so hotplug does not delete the BlockDriverState from
1126      * underneath us.
1127      */
1128     drive_get_ref(drive_get_by_blockdev(bs));
1129
1130     trace_qmp_block_stream(bs, bs->job);
1131 }
1132
1133 void qmp_block_commit(const char *device,
1134                       bool has_base, const char *base, const char *top,
1135                       bool has_speed, int64_t speed,
1136                       Error **errp)
1137 {
1138     BlockDriverState *bs;
1139     BlockDriverState *base_bs, *top_bs;
1140     Error *local_err = NULL;
1141     /* This will be part of the QMP command, if/when the
1142      * BlockdevOnError change for blkmirror makes it in
1143      */
1144     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1145
1146     /* drain all i/o before commits */
1147     bdrv_drain_all();
1148
1149     bs = bdrv_find(device);
1150     if (!bs) {
1151         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1152         return;
1153     }
1154
1155     /* default top_bs is the active layer */
1156     top_bs = bs;
1157
1158     if (top) {
1159         if (strcmp(bs->filename, top) != 0) {
1160             top_bs = bdrv_find_backing_image(bs, top);
1161         }
1162     }
1163
1164     if (top_bs == NULL) {
1165         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1166         return;
1167     }
1168
1169     if (has_base && base) {
1170         base_bs = bdrv_find_backing_image(top_bs, base);
1171     } else {
1172         base_bs = bdrv_find_base(top_bs);
1173     }
1174
1175     if (base_bs == NULL) {
1176         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1177         return;
1178     }
1179
1180     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1181                 &local_err);
1182     if (local_err != NULL) {
1183         error_propagate(errp, local_err);
1184         return;
1185     }
1186     /* Grab a reference so hotplug does not delete the BlockDriverState from
1187      * underneath us.
1188      */
1189     drive_get_ref(drive_get_by_blockdev(bs));
1190 }
1191
1192 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1193
1194 void qmp_drive_mirror(const char *device, const char *target,
1195                       bool has_format, const char *format,
1196                       enum MirrorSyncMode sync,
1197                       bool has_mode, enum NewImageMode mode,
1198                       bool has_speed, int64_t speed,
1199                       bool has_granularity, uint32_t granularity,
1200                       bool has_buf_size, int64_t buf_size,
1201                       bool has_on_source_error, BlockdevOnError on_source_error,
1202                       bool has_on_target_error, BlockdevOnError on_target_error,
1203                       Error **errp)
1204 {
1205     BlockDriverState *bs;
1206     BlockDriverState *source, *target_bs;
1207     BlockDriver *proto_drv;
1208     BlockDriver *drv = NULL;
1209     Error *local_err = NULL;
1210     int flags;
1211     uint64_t size;
1212     int ret;
1213
1214     if (!has_speed) {
1215         speed = 0;
1216     }
1217     if (!has_on_source_error) {
1218         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1219     }
1220     if (!has_on_target_error) {
1221         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1222     }
1223     if (!has_mode) {
1224         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1225     }
1226     if (!has_granularity) {
1227         granularity = 0;
1228     }
1229     if (!has_buf_size) {
1230         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1231     }
1232
1233     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1234         error_set(errp, QERR_INVALID_PARAMETER, device);
1235         return;
1236     }
1237     if (granularity & (granularity - 1)) {
1238         error_set(errp, QERR_INVALID_PARAMETER, device);
1239         return;
1240     }
1241
1242     bs = bdrv_find(device);
1243     if (!bs) {
1244         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1245         return;
1246     }
1247
1248     if (!bdrv_is_inserted(bs)) {
1249         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1250         return;
1251     }
1252
1253     if (!has_format) {
1254         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1255     }
1256     if (format) {
1257         drv = bdrv_find_format(format);
1258         if (!drv) {
1259             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1260             return;
1261         }
1262     }
1263
1264     if (bdrv_in_use(bs)) {
1265         error_set(errp, QERR_DEVICE_IN_USE, device);
1266         return;
1267     }
1268
1269     flags = bs->open_flags | BDRV_O_RDWR;
1270     source = bs->backing_hd;
1271     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1272         sync = MIRROR_SYNC_MODE_FULL;
1273     }
1274
1275     proto_drv = bdrv_find_protocol(target);
1276     if (!proto_drv) {
1277         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1278         return;
1279     }
1280
1281     bdrv_get_geometry(bs, &size);
1282     size *= 512;
1283     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1284         /* create new image w/o backing file */
1285         assert(format && drv);
1286         bdrv_img_create(target, format,
1287                         NULL, NULL, NULL, size, flags, &local_err);
1288     } else {
1289         switch (mode) {
1290         case NEW_IMAGE_MODE_EXISTING:
1291             ret = 0;
1292             break;
1293         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1294             /* create new image with backing file */
1295             bdrv_img_create(target, format,
1296                             source->filename,
1297                             source->drv->format_name,
1298                             NULL, size, flags, &local_err);
1299             break;
1300         default:
1301             abort();
1302         }
1303     }
1304
1305     if (error_is_set(&local_err)) {
1306         error_propagate(errp, local_err);
1307         return;
1308     }
1309
1310     /* Mirroring takes care of copy-on-write using the source's backing
1311      * file.
1312      */
1313     target_bs = bdrv_new("");
1314     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1315
1316     if (ret < 0) {
1317         bdrv_delete(target_bs);
1318         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1319         return;
1320     }
1321
1322     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1323                  on_source_error, on_target_error,
1324                  block_job_cb, bs, &local_err);
1325     if (local_err != NULL) {
1326         bdrv_delete(target_bs);
1327         error_propagate(errp, local_err);
1328         return;
1329     }
1330
1331     /* Grab a reference so hotplug does not delete the BlockDriverState from
1332      * underneath us.
1333      */
1334     drive_get_ref(drive_get_by_blockdev(bs));
1335 }
1336
1337 static BlockJob *find_block_job(const char *device)
1338 {
1339     BlockDriverState *bs;
1340
1341     bs = bdrv_find(device);
1342     if (!bs || !bs->job) {
1343         return NULL;
1344     }
1345     return bs->job;
1346 }
1347
1348 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1349 {
1350     BlockJob *job = find_block_job(device);
1351
1352     if (!job) {
1353         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1354         return;
1355     }
1356
1357     block_job_set_speed(job, speed, errp);
1358 }
1359
1360 void qmp_block_job_cancel(const char *device,
1361                           bool has_force, bool force, Error **errp)
1362 {
1363     BlockJob *job = find_block_job(device);
1364
1365     if (!has_force) {
1366         force = false;
1367     }
1368
1369     if (!job) {
1370         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1371         return;
1372     }
1373     if (job->paused && !force) {
1374         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1375         return;
1376     }
1377
1378     trace_qmp_block_job_cancel(job);
1379     block_job_cancel(job);
1380 }
1381
1382 void qmp_block_job_pause(const char *device, Error **errp)
1383 {
1384     BlockJob *job = find_block_job(device);
1385
1386     if (!job) {
1387         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1388         return;
1389     }
1390
1391     trace_qmp_block_job_pause(job);
1392     block_job_pause(job);
1393 }
1394
1395 void qmp_block_job_resume(const char *device, Error **errp)
1396 {
1397     BlockJob *job = find_block_job(device);
1398
1399     if (!job) {
1400         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1401         return;
1402     }
1403
1404     trace_qmp_block_job_resume(job);
1405     block_job_resume(job);
1406 }
1407
1408 void qmp_block_job_complete(const char *device, Error **errp)
1409 {
1410     BlockJob *job = find_block_job(device);
1411
1412     if (!job) {
1413         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1414         return;
1415     }
1416
1417     trace_qmp_block_job_complete(job);
1418     block_job_complete(job, errp);
1419 }
1420
1421 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1422 {
1423     BlockJobInfoList **prev = opaque;
1424     BlockJob *job = bs->job;
1425
1426     if (job) {
1427         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1428         elem->value = block_job_query(bs->job);
1429         (*prev)->next = elem;
1430         *prev = elem;
1431     }
1432 }
1433
1434 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1435 {
1436     /* Dummy is a fake list element for holding the head pointer */
1437     BlockJobInfoList dummy = {};
1438     BlockJobInfoList *prev = &dummy;
1439     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1440     return dummy.next;
1441 }
1442
1443 QemuOptsList qemu_drive_opts = {
1444     .name = "drive",
1445     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1446     .desc = {
1447         {
1448             .name = "bus",
1449             .type = QEMU_OPT_NUMBER,
1450             .help = "bus number",
1451         },{
1452             .name = "unit",
1453             .type = QEMU_OPT_NUMBER,
1454             .help = "unit number (i.e. lun for scsi)",
1455         },{
1456             .name = "if",
1457             .type = QEMU_OPT_STRING,
1458             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1459         },{
1460             .name = "index",
1461             .type = QEMU_OPT_NUMBER,
1462             .help = "index number",
1463         },{
1464             .name = "cyls",
1465             .type = QEMU_OPT_NUMBER,
1466             .help = "number of cylinders (ide disk geometry)",
1467         },{
1468             .name = "heads",
1469             .type = QEMU_OPT_NUMBER,
1470             .help = "number of heads (ide disk geometry)",
1471         },{
1472             .name = "secs",
1473             .type = QEMU_OPT_NUMBER,
1474             .help = "number of sectors (ide disk geometry)",
1475         },{
1476             .name = "trans",
1477             .type = QEMU_OPT_STRING,
1478             .help = "chs translation (auto, lba. none)",
1479         },{
1480             .name = "media",
1481             .type = QEMU_OPT_STRING,
1482             .help = "media type (disk, cdrom)",
1483         },{
1484             .name = "snapshot",
1485             .type = QEMU_OPT_BOOL,
1486             .help = "enable/disable snapshot mode",
1487         },{
1488             .name = "file",
1489             .type = QEMU_OPT_STRING,
1490             .help = "disk image",
1491         },{
1492             .name = "cache",
1493             .type = QEMU_OPT_STRING,
1494             .help = "host cache usage (none, writeback, writethrough, "
1495                     "directsync, unsafe)",
1496         },{
1497             .name = "aio",
1498             .type = QEMU_OPT_STRING,
1499             .help = "host AIO implementation (threads, native)",
1500         },{
1501             .name = "format",
1502             .type = QEMU_OPT_STRING,
1503             .help = "disk format (raw, qcow2, ...)",
1504         },{
1505             .name = "serial",
1506             .type = QEMU_OPT_STRING,
1507             .help = "disk serial number",
1508         },{
1509             .name = "rerror",
1510             .type = QEMU_OPT_STRING,
1511             .help = "read error action",
1512         },{
1513             .name = "werror",
1514             .type = QEMU_OPT_STRING,
1515             .help = "write error action",
1516         },{
1517             .name = "addr",
1518             .type = QEMU_OPT_STRING,
1519             .help = "pci address (virtio only)",
1520         },{
1521             .name = "readonly",
1522             .type = QEMU_OPT_BOOL,
1523             .help = "open drive file as read-only",
1524         },{
1525             .name = "iops",
1526             .type = QEMU_OPT_NUMBER,
1527             .help = "limit total I/O operations per second",
1528         },{
1529             .name = "iops_rd",
1530             .type = QEMU_OPT_NUMBER,
1531             .help = "limit read operations per second",
1532         },{
1533             .name = "iops_wr",
1534             .type = QEMU_OPT_NUMBER,
1535             .help = "limit write operations per second",
1536         },{
1537             .name = "bps",
1538             .type = QEMU_OPT_NUMBER,
1539             .help = "limit total bytes per second",
1540         },{
1541             .name = "bps_rd",
1542             .type = QEMU_OPT_NUMBER,
1543             .help = "limit read bytes per second",
1544         },{
1545             .name = "bps_wr",
1546             .type = QEMU_OPT_NUMBER,
1547             .help = "limit write bytes per second",
1548         },{
1549             .name = "copy-on-read",
1550             .type = QEMU_OPT_BOOL,
1551             .help = "copy read data from backing file into image file",
1552         },{
1553             .name = "boot",
1554             .type = QEMU_OPT_BOOL,
1555             .help = "(deprecated, ignored)",
1556         },
1557         { /* end of list */ }
1558     },
1559 };