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         if (ret == -EBUSY) {
 651             qerror_report(QERR_DEVICE_IN_USE, device);
 652             return;
 653         }
 654     } else {
 655         bs = bdrv_find(device);
 656         if (!bs) {
 657             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 658             return;
 659         }
 660         ret = bdrv_commit(bs);
 661         if (ret == -EBUSY) {
 662             qerror_report(QERR_DEVICE_IN_USE, device);
 663             return;
 664         }
 665     }
 666 }
 667
 668 static void blockdev_do_action(int kind, void *data, Error **errp)
 669 {
 670     BlockdevAction action;
 671     BlockdevActionList list;
 672
 673     action.kind = kind;
 674     action.data = data;
 675     list.value = &action;
 676     list.next = NULL;
 677     qmp_transaction(&list, errp);
 678 }
 679
 680 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 681                                 bool has_format, const char *format,
 682                                 bool has_mode, enum NewImageMode mode,
 683                                 Error **errp)
 684 {
 685     BlockdevSnapshot snapshot = {
 686         .device = (char *) device,
 687         .snapshot_file = (char *) snapshot_file,
 688         .has_format = has_format,
 689         .format = (char *) format,
 690         .has_mode = has_mode,
 691         .mode = mode,
 692     };
 693     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 694                        errp);
 695 }
 696
 697
 698 /* New and old BlockDriverState structs for group snapshots */
 699 typedef struct BlkTransactionStates {
 700     BlockDriverState *old_bs;
 701     BlockDriverState *new_bs;
 702     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 703 } BlkTransactionStates;
 704
 705 /*
 706  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 707  *  then we do not pivot any of the devices in the group, and abandon the
 708  *  snapshots
 709  */
 710 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 711 {
 712     int ret = 0;
 713     BlockdevActionList *dev_entry = dev_list;
 714     BlkTransactionStates *states, *next;
 715     Error *local_err = NULL;
 716
 717     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 718     QSIMPLEQ_INIT(&snap_bdrv_states);
 719
 720     /* drain all i/o before any snapshots */
 721     bdrv_drain_all();
 722
 723     /* We don't do anything in this loop that commits us to the snapshot */
 724     while (NULL != dev_entry) {
 725         BlockdevAction *dev_info = NULL;
 726         BlockDriver *proto_drv;
 727         BlockDriver *drv;
 728         int flags;
 729         enum NewImageMode mode;
 730         const char *new_image_file;
 731         const char *device;
 732         const char *format = "qcow2";
 733
 734         dev_info = dev_entry->value;
 735         dev_entry = dev_entry->next;
 736
 737         states = g_malloc0(sizeof(BlkTransactionStates));
 738         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 739
 740         switch (dev_info->kind) {
 741         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 742             device = dev_info->blockdev_snapshot_sync->device;
 743             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 744                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 745             }
 746             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 747             if (dev_info->blockdev_snapshot_sync->has_format) {
 748                 format = dev_info->blockdev_snapshot_sync->format;
 749             }
 750             mode = dev_info->blockdev_snapshot_sync->mode;
 751             break;
 752         default:
 753             abort();
 754         }
 755
 756         drv = bdrv_find_format(format);
 757         if (!drv) {
 758             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 759             goto delete_and_fail;
 760         }
 761
 762         states->old_bs = bdrv_find(device);
 763         if (!states->old_bs) {
 764             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 765             goto delete_and_fail;
 766         }
 767
 768         if (!bdrv_is_inserted(states->old_bs)) {
 769             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 770             goto delete_and_fail;
 771         }
 772
 773         if (bdrv_in_use(states->old_bs)) {
 774             error_set(errp, QERR_DEVICE_IN_USE, device);
 775             goto delete_and_fail;
 776         }
 777
 778         if (!bdrv_is_read_only(states->old_bs)) {
 779             if (bdrv_flush(states->old_bs)) {
 780                 error_set(errp, QERR_IO_ERROR);
 781                 goto delete_and_fail;
 782             }
 783         }
 784
 785         flags = states->old_bs->open_flags;
 786
 787         proto_drv = bdrv_find_protocol(new_image_file);
 788         if (!proto_drv) {
 789             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 790             goto delete_and_fail;
 791         }
 792
 793         /* create new image w/backing file */
 794         if (mode != NEW_IMAGE_MODE_EXISTING) {
 795             bdrv_img_create(new_image_file, format,
 796                             states->old_bs->filename,
 797                             states->old_bs->drv->format_name,
 798                             NULL, -1, flags, &local_err);
 799             if (error_is_set(&local_err)) {
 800                 error_propagate(errp, local_err);
 801                 goto delete_and_fail;
 802             }
 803         }
 804
 805         /* We will manually add the backing_hd field to the bs later */
 806         states->new_bs = bdrv_new("");
 807         ret = bdrv_open(states->new_bs, new_image_file,
 808                         flags | BDRV_O_NO_BACKING, drv);
 809         if (ret != 0) {
 810             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 811             goto delete_and_fail;
 812         }
 813     }
 814
 815
 816     /* Now we are going to do the actual pivot.  Everything up to this point
 817      * is reversible, but we are committed at this point */
 818     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 819         /* This removes our old bs from the bdrv_states, and adds the new bs */
 820         bdrv_append(states->new_bs, states->old_bs);
 821         /* We don't need (or want) to use the transactional
 822          * bdrv_reopen_multiple() across all the entries at once, because we
 823          * don't want to abort all of them if one of them fails the reopen */
 824         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 825                     NULL);
 826     }
 827
 828     /* success */
 829     goto exit;
 830
 831 delete_and_fail:
 832     /*
 833     * failure, and it is all-or-none; abandon each new bs, and keep using
 834     * the original bs for all images
 835     */
 836     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 837         if (states->new_bs) {
 838              bdrv_delete(states->new_bs);
 839         }
 840     }
 841 exit:
 842     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 843         g_free(states);
 844     }
 845 }
 846
 847
 848 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 849 {
 850     if (bdrv_in_use(bs)) {
 851         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 852         return;
 853     }
 854     if (!bdrv_dev_has_removable_media(bs)) {
 855         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 856         return;
 857     }
 858
 859     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 860         bdrv_dev_eject_request(bs, force);
 861         if (!force) {
 862             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 863             return;
 864         }
 865     }
 866
 867     bdrv_close(bs);
 868 }
 869
 870 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 871 {
 872     BlockDriverState *bs;
 873
 874     bs = bdrv_find(device);
 875     if (!bs) {
 876         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 877         return;
 878     }
 879
 880     eject_device(bs, force, errp);
 881 }
 882
 883 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 884 {
 885     BlockDriverState *bs;
 886     int err;
 887
 888     bs = bdrv_find(device);
 889     if (!bs) {
 890         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 891         return;
 892     }
 893
 894     err = bdrv_set_key(bs, password);
 895     if (err == -EINVAL) {
 896         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 897         return;
 898     } else if (err < 0) {
 899         error_set(errp, QERR_INVALID_PASSWORD);
 900         return;
 901     }
 902 }
 903
 904 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 905                                     int bdrv_flags, BlockDriver *drv,
 906                                     const char *password, Error **errp)
 907 {
 908     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 909         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 910         return;
 911     }
 912
 913     if (bdrv_key_required(bs)) {
 914         if (password) {
 915             if (bdrv_set_key(bs, password) < 0) {
 916                 error_set(errp, QERR_INVALID_PASSWORD);
 917             }
 918         } else {
 919             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 920                       bdrv_get_encrypted_filename(bs));
 921         }
 922     } else if (password) {
 923         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 924     }
 925 }
 926
 927 void qmp_change_blockdev(const char *device, const char *filename,
 928                          bool has_format, const char *format, Error **errp)
 929 {
 930     BlockDriverState *bs;
 931     BlockDriver *drv = NULL;
 932     int bdrv_flags;
 933     Error *err = NULL;
 934
 935     bs = bdrv_find(device);
 936     if (!bs) {
 937         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 938         return;
 939     }
 940
 941     if (format) {
 942         drv = bdrv_find_whitelisted_format(format);
 943         if (!drv) {
 944             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 945             return;
 946         }
 947     }
 948
 949     eject_device(bs, 0, &err);
 950     if (error_is_set(&err)) {
 951         error_propagate(errp, err);
 952         return;
 953     }
 954
 955     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 956     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 957
 958     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 959 }
 960
 961 /* throttling disk I/O limits */
 962 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 963                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 964                                int64_t iops_wr, Error **errp)
 965 {
 966     BlockIOLimit io_limits;
 967     BlockDriverState *bs;
 968
 969     bs = bdrv_find(device);
 970     if (!bs) {
 971         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 972         return;
 973     }
 974
 975     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 976     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 977     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 978     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 979     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 980     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 981
 982     if (!do_check_io_limits(&io_limits)) {
 983         error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
 984         return;
 985     }
 986
 987     bs->io_limits = io_limits;
 988     bs->slice_time = BLOCK_IO_SLICE_TIME;
 989
 990     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 991         bdrv_io_limits_enable(bs);
 992     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 993         bdrv_io_limits_disable(bs);
 994     } else {
 995         if (bs->block_timer) {
 996             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 997         }
 998     }
 999 }
1000
1001 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1002 {
1003     const char *id = qdict_get_str(qdict, "id");
1004     BlockDriverState *bs;
1005
1006     bs = bdrv_find(id);
1007     if (!bs) {
1008         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1009         return -1;
1010     }
1011     if (bdrv_in_use(bs)) {
1012         qerror_report(QERR_DEVICE_IN_USE, id);
1013         return -1;
1014     }
1015
1016     /* quiesce block driver; prevent further io */
1017     bdrv_drain_all();
1018     bdrv_flush(bs);
1019     bdrv_close(bs);
1020
1021     /* if we have a device attached to this BlockDriverState
1022      * then we need to make the drive anonymous until the device
1023      * can be removed.  If this is a drive with no device backing
1024      * then we can just get rid of the block driver state right here.
1025      */
1026     if (bdrv_get_attached_dev(bs)) {
1027         bdrv_make_anon(bs);
1028     } else {
1029         drive_uninit(drive_get_by_blockdev(bs));
1030     }
1031
1032     return 0;
1033 }
1034
1035 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1036 {
1037     BlockDriverState *bs;
1038
1039     bs = bdrv_find(device);
1040     if (!bs) {
1041         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1042         return;
1043     }
1044
1045     if (size < 0) {
1046         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1047         return;
1048     }
1049
1050     switch (bdrv_truncate(bs, size)) {
1051     case 0:
1052         break;
1053     case -ENOMEDIUM:
1054         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1055         break;
1056     case -ENOTSUP:
1057         error_set(errp, QERR_UNSUPPORTED);
1058         break;
1059     case -EACCES:
1060         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1061         break;
1062     case -EBUSY:
1063         error_set(errp, QERR_DEVICE_IN_USE, device);
1064         break;
1065     default:
1066         error_set(errp, QERR_UNDEFINED_ERROR);
1067         break;
1068     }
1069 }
1070
1071 static void block_job_cb(void *opaque, int ret)
1072 {
1073     BlockDriverState *bs = opaque;
1074     QObject *obj;
1075
1076     trace_block_job_cb(bs, bs->job, ret);
1077
1078     assert(bs->job);
1079     obj = qobject_from_block_job(bs->job);
1080     if (ret < 0) {
1081         QDict *dict = qobject_to_qdict(obj);
1082         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1083     }
1084
1085     if (block_job_is_cancelled(bs->job)) {
1086         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1087     } else {
1088         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1089     }
1090     qobject_decref(obj);
1091
1092     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1093 }
1094
1095 void qmp_block_stream(const char *device, bool has_base,
1096                       const char *base, bool has_speed, int64_t speed,
1097                       bool has_on_error, BlockdevOnError on_error,
1098                       Error **errp)
1099 {
1100     BlockDriverState *bs;
1101     BlockDriverState *base_bs = NULL;
1102     Error *local_err = NULL;
1103
1104     if (!has_on_error) {
1105         on_error = BLOCKDEV_ON_ERROR_REPORT;
1106     }
1107
1108     bs = bdrv_find(device);
1109     if (!bs) {
1110         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1111         return;
1112     }
1113
1114     if (base) {
1115         base_bs = bdrv_find_backing_image(bs, base);
1116         if (base_bs == NULL) {
1117             error_set(errp, QERR_BASE_NOT_FOUND, base);
1118             return;
1119         }
1120     }
1121
1122     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1123                  on_error, block_job_cb, bs, &local_err);
1124     if (error_is_set(&local_err)) {
1125         error_propagate(errp, local_err);
1126         return;
1127     }
1128
1129     /* Grab a reference so hotplug does not delete the BlockDriverState from
1130      * underneath us.
1131      */
1132     drive_get_ref(drive_get_by_blockdev(bs));
1133
1134     trace_qmp_block_stream(bs, bs->job);
1135 }
1136
1137 void qmp_block_commit(const char *device,
1138                       bool has_base, const char *base, const char *top,
1139                       bool has_speed, int64_t speed,
1140                       Error **errp)
1141 {
1142     BlockDriverState *bs;
1143     BlockDriverState *base_bs, *top_bs;
1144     Error *local_err = NULL;
1145     /* This will be part of the QMP command, if/when the
1146      * BlockdevOnError change for blkmirror makes it in
1147      */
1148     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1149
1150     /* drain all i/o before commits */
1151     bdrv_drain_all();
1152
1153     bs = bdrv_find(device);
1154     if (!bs) {
1155         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1156         return;
1157     }
1158
1159     /* default top_bs is the active layer */
1160     top_bs = bs;
1161
1162     if (top) {
1163         if (strcmp(bs->filename, top) != 0) {
1164             top_bs = bdrv_find_backing_image(bs, top);
1165         }
1166     }
1167
1168     if (top_bs == NULL) {
1169         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1170         return;
1171     }
1172
1173     if (has_base && base) {
1174         base_bs = bdrv_find_backing_image(top_bs, base);
1175     } else {
1176         base_bs = bdrv_find_base(top_bs);
1177     }
1178
1179     if (base_bs == NULL) {
1180         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1181         return;
1182     }
1183
1184     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1185                 &local_err);
1186     if (local_err != NULL) {
1187         error_propagate(errp, local_err);
1188         return;
1189     }
1190     /* Grab a reference so hotplug does not delete the BlockDriverState from
1191      * underneath us.
1192      */
1193     drive_get_ref(drive_get_by_blockdev(bs));
1194 }
1195
1196 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1197
1198 void qmp_drive_mirror(const char *device, const char *target,
1199                       bool has_format, const char *format,
1200                       enum MirrorSyncMode sync,
1201                       bool has_mode, enum NewImageMode mode,
1202                       bool has_speed, int64_t speed,
1203                       bool has_granularity, uint32_t granularity,
1204                       bool has_buf_size, int64_t buf_size,
1205                       bool has_on_source_error, BlockdevOnError on_source_error,
1206                       bool has_on_target_error, BlockdevOnError on_target_error,
1207                       Error **errp)
1208 {
1209     BlockDriverState *bs;
1210     BlockDriverState *source, *target_bs;
1211     BlockDriver *proto_drv;
1212     BlockDriver *drv = NULL;
1213     Error *local_err = NULL;
1214     int flags;
1215     uint64_t size;
1216     int ret;
1217
1218     if (!has_speed) {
1219         speed = 0;
1220     }
1221     if (!has_on_source_error) {
1222         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1223     }
1224     if (!has_on_target_error) {
1225         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1226     }
1227     if (!has_mode) {
1228         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1229     }
1230     if (!has_granularity) {
1231         granularity = 0;
1232     }
1233     if (!has_buf_size) {
1234         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1235     }
1236
1237     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1238         error_set(errp, QERR_INVALID_PARAMETER, device);
1239         return;
1240     }
1241     if (granularity & (granularity - 1)) {
1242         error_set(errp, QERR_INVALID_PARAMETER, device);
1243         return;
1244     }
1245
1246     bs = bdrv_find(device);
1247     if (!bs) {
1248         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1249         return;
1250     }
1251
1252     if (!bdrv_is_inserted(bs)) {
1253         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1254         return;
1255     }
1256
1257     if (!has_format) {
1258         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1259     }
1260     if (format) {
1261         drv = bdrv_find_format(format);
1262         if (!drv) {
1263             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1264             return;
1265         }
1266     }
1267
1268     if (bdrv_in_use(bs)) {
1269         error_set(errp, QERR_DEVICE_IN_USE, device);
1270         return;
1271     }
1272
1273     flags = bs->open_flags | BDRV_O_RDWR;
1274     source = bs->backing_hd;
1275     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1276         sync = MIRROR_SYNC_MODE_FULL;
1277     }
1278
1279     proto_drv = bdrv_find_protocol(target);
1280     if (!proto_drv) {
1281         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1282         return;
1283     }
1284
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_get_geometry(bs, &size);
1289         size *= 512;
1290         bdrv_img_create(target, format,
1291                         NULL, NULL, NULL, size, flags, &local_err);
1292     } else {
1293         switch (mode) {
1294         case NEW_IMAGE_MODE_EXISTING:
1295             ret = 0;
1296             break;
1297         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1298             /* create new image with backing file */
1299             bdrv_img_create(target, format,
1300                             source->filename,
1301                             source->drv->format_name,
1302                             NULL, -1, flags, &local_err);
1303             break;
1304         default:
1305             abort();
1306         }
1307     }
1308
1309     if (error_is_set(&local_err)) {
1310         error_propagate(errp, local_err);
1311         return;
1312     }
1313
1314     /* Mirroring takes care of copy-on-write using the source's backing
1315      * file.
1316      */
1317     target_bs = bdrv_new("");
1318     ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
1319
1320     if (ret < 0) {
1321         bdrv_delete(target_bs);
1322         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1323         return;
1324     }
1325
1326     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1327                  on_source_error, on_target_error,
1328                  block_job_cb, bs, &local_err);
1329     if (local_err != NULL) {
1330         bdrv_delete(target_bs);
1331         error_propagate(errp, local_err);
1332         return;
1333     }
1334
1335     /* Grab a reference so hotplug does not delete the BlockDriverState from
1336      * underneath us.
1337      */
1338     drive_get_ref(drive_get_by_blockdev(bs));
1339 }
1340
1341 static BlockJob *find_block_job(const char *device)
1342 {
1343     BlockDriverState *bs;
1344
1345     bs = bdrv_find(device);
1346     if (!bs || !bs->job) {
1347         return NULL;
1348     }
1349     return bs->job;
1350 }
1351
1352 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1353 {
1354     BlockJob *job = find_block_job(device);
1355
1356     if (!job) {
1357         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1358         return;
1359     }
1360
1361     block_job_set_speed(job, speed, errp);
1362 }
1363
1364 void qmp_block_job_cancel(const char *device,
1365                           bool has_force, bool force, Error **errp)
1366 {
1367     BlockJob *job = find_block_job(device);
1368
1369     if (!has_force) {
1370         force = false;
1371     }
1372
1373     if (!job) {
1374         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1375         return;
1376     }
1377     if (job->paused && !force) {
1378         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1379         return;
1380     }
1381
1382     trace_qmp_block_job_cancel(job);
1383     block_job_cancel(job);
1384 }
1385
1386 void qmp_block_job_pause(const char *device, Error **errp)
1387 {
1388     BlockJob *job = find_block_job(device);
1389
1390     if (!job) {
1391         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1392         return;
1393     }
1394
1395     trace_qmp_block_job_pause(job);
1396     block_job_pause(job);
1397 }
1398
1399 void qmp_block_job_resume(const char *device, Error **errp)
1400 {
1401     BlockJob *job = find_block_job(device);
1402
1403     if (!job) {
1404         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1405         return;
1406     }
1407
1408     trace_qmp_block_job_resume(job);
1409     block_job_resume(job);
1410 }
1411
1412 void qmp_block_job_complete(const char *device, Error **errp)
1413 {
1414     BlockJob *job = find_block_job(device);
1415
1416     if (!job) {
1417         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1418         return;
1419     }
1420
1421     trace_qmp_block_job_complete(job);
1422     block_job_complete(job, errp);
1423 }
1424
1425 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1426 {
1427     BlockJobInfoList **prev = opaque;
1428     BlockJob *job = bs->job;
1429
1430     if (job) {
1431         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1432         elem->value = block_job_query(bs->job);
1433         (*prev)->next = elem;
1434         *prev = elem;
1435     }
1436 }
1437
1438 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1439 {
1440     /* Dummy is a fake list element for holding the head pointer */
1441     BlockJobInfoList dummy = {};
1442     BlockJobInfoList *prev = &dummy;
1443     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1444     return dummy.next;
1445 }
1446
1447 QemuOptsList qemu_drive_opts = {
1448     .name = "drive",
1449     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1450     .desc = {
1451         {
1452             .name = "bus",
1453             .type = QEMU_OPT_NUMBER,
1454             .help = "bus number",
1455         },{
1456             .name = "unit",
1457             .type = QEMU_OPT_NUMBER,
1458             .help = "unit number (i.e. lun for scsi)",
1459         },{
1460             .name = "if",
1461             .type = QEMU_OPT_STRING,
1462             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1463         },{
1464             .name = "index",
1465             .type = QEMU_OPT_NUMBER,
1466             .help = "index number",
1467         },{
1468             .name = "cyls",
1469             .type = QEMU_OPT_NUMBER,
1470             .help = "number of cylinders (ide disk geometry)",
1471         },{
1472             .name = "heads",
1473             .type = QEMU_OPT_NUMBER,
1474             .help = "number of heads (ide disk geometry)",
1475         },{
1476             .name = "secs",
1477             .type = QEMU_OPT_NUMBER,
1478             .help = "number of sectors (ide disk geometry)",
1479         },{
1480             .name = "trans",
1481             .type = QEMU_OPT_STRING,
1482             .help = "chs translation (auto, lba. none)",
1483         },{
1484             .name = "media",
1485             .type = QEMU_OPT_STRING,
1486             .help = "media type (disk, cdrom)",
1487         },{
1488             .name = "snapshot",
1489             .type = QEMU_OPT_BOOL,
1490             .help = "enable/disable snapshot mode",
1491         },{
1492             .name = "file",
1493             .type = QEMU_OPT_STRING,
1494             .help = "disk image",
1495         },{
1496             .name = "cache",
1497             .type = QEMU_OPT_STRING,
1498             .help = "host cache usage (none, writeback, writethrough, "
1499                     "directsync, unsafe)",
1500         },{
1501             .name = "aio",
1502             .type = QEMU_OPT_STRING,
1503             .help = "host AIO implementation (threads, native)",
1504         },{
1505             .name = "format",
1506             .type = QEMU_OPT_STRING,
1507             .help = "disk format (raw, qcow2, ...)",
1508         },{
1509             .name = "serial",
1510             .type = QEMU_OPT_STRING,
1511             .help = "disk serial number",
1512         },{
1513             .name = "rerror",
1514             .type = QEMU_OPT_STRING,
1515             .help = "read error action",
1516         },{
1517             .name = "werror",
1518             .type = QEMU_OPT_STRING,
1519             .help = "write error action",
1520         },{
1521             .name = "addr",
1522             .type = QEMU_OPT_STRING,
1523             .help = "pci address (virtio only)",
1524         },{
1525             .name = "readonly",
1526             .type = QEMU_OPT_BOOL,
1527             .help = "open drive file as read-only",
1528         },{
1529             .name = "iops",
1530             .type = QEMU_OPT_NUMBER,
1531             .help = "limit total I/O operations per second",
1532         },{
1533             .name = "iops_rd",
1534             .type = QEMU_OPT_NUMBER,
1535             .help = "limit read operations per second",
1536         },{
1537             .name = "iops_wr",
1538             .type = QEMU_OPT_NUMBER,
1539             .help = "limit write operations per second",
1540         },{
1541             .name = "bps",
1542             .type = QEMU_OPT_NUMBER,
1543             .help = "limit total bytes per second",
1544         },{
1545             .name = "bps_rd",
1546             .type = QEMU_OPT_NUMBER,
1547             .help = "limit read bytes per second",
1548         },{
1549             .name = "bps_wr",
1550             .type = QEMU_OPT_NUMBER,
1551             .help = "limit write bytes per second",
1552         },{
1553             .name = "copy-on-read",
1554             .type = QEMU_OPT_BOOL,
1555             .help = "copy read data from backing file into image file",
1556         },{
1557             .name = "boot",
1558             .type = QEMU_OPT_BOOL,
1559             .help = "(deprecated, ignored)",
1560         },
1561         { /* end of list */ }
1562     },
1563 };