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