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 extern QemuOptsList qemu_common_drive_opts;
  26
  27 static const char *const if_name[IF_COUNT] = {
  28     [IF_NONE] = "none",
  29     [IF_IDE] = "ide",
  30     [IF_SCSI] = "scsi",
  31     [IF_FLOPPY] = "floppy",
  32     [IF_PFLASH] = "pflash",
  33     [IF_MTD] = "mtd",
  34     [IF_SD] = "sd",
  35     [IF_VIRTIO] = "virtio",
  36     [IF_XEN] = "xen",
  37 };
  38
  39 static const int if_max_devs[IF_COUNT] = {
  40     /*
  41      * Do not change these numbers!  They govern how drive option
  42      * index maps to unit and bus.  That mapping is ABI.
  43      *
  44      * All controllers used to imlement if=T drives need to support
  45      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  46      * Otherwise, some index values map to "impossible" bus, unit
  47      * values.
  48      *
  49      * For instance, if you change [IF_SCSI] to 255, -drive
  50      * if=scsi,index=12 no longer means bus=1,unit=5, but
  51      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  52      * the drive can't be set up.  Regression.
  53      */
  54     [IF_IDE] = 2,
  55     [IF_SCSI] = 7,
  56 };
  57
  58 /*
  59  * We automatically delete the drive when a device using it gets
  60  * unplugged.  Questionable feature, but we can't just drop it.
  61  * Device models call blockdev_mark_auto_del() to schedule the
  62  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  63  * when deletion is actually safe.
  64  */
  65 void blockdev_mark_auto_del(BlockDriverState *bs)
  66 {
  67     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  68
  69     if (bs->job) {
  70         block_job_cancel(bs->job);
  71     }
  72     if (dinfo) {
  73         dinfo->auto_del = 1;
  74     }
  75 }
  76
  77 void blockdev_auto_del(BlockDriverState *bs)
  78 {
  79     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  80
  81     if (dinfo && dinfo->auto_del) {
  82         drive_put_ref(dinfo);
  83     }
  84 }
  85
  86 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
  87 {
  88     int max_devs = if_max_devs[type];
  89     return max_devs ? index / max_devs : 0;
  90 }
  91
  92 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
  93 {
  94     int max_devs = if_max_devs[type];
  95     return max_devs ? index % max_devs : index;
  96 }
  97
  98 QemuOpts *drive_def(const char *optstr)
  99 {
 100     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
 101 }
 102
 103 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 104                     const char *optstr)
 105 {
 106     QemuOpts *opts;
 107     char buf[32];
 108
 109     opts = drive_def(optstr);
 110     if (!opts) {
 111         return NULL;
 112     }
 113     if (type != IF_DEFAULT) {
 114         qemu_opt_set(opts, "if", if_name[type]);
 115     }
 116     if (index >= 0) {
 117         snprintf(buf, sizeof(buf), "%d", index);
 118         qemu_opt_set(opts, "index", buf);
 119     }
 120     if (file)
 121         qemu_opt_set(opts, "file", file);
 122     return opts;
 123 }
 124
 125 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 126 {
 127     DriveInfo *dinfo;
 128
 129     /* seek interface, bus and unit */
 130
 131     QTAILQ_FOREACH(dinfo, &drives, next) {
 132         if (dinfo->type == type &&
 133             dinfo->bus == bus &&
 134             dinfo->unit == unit)
 135             return dinfo;
 136     }
 137
 138     return NULL;
 139 }
 140
 141 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 142 {
 143     return drive_get(type,
 144                      drive_index_to_bus_id(type, index),
 145                      drive_index_to_unit_id(type, index));
 146 }
 147
 148 int drive_get_max_bus(BlockInterfaceType type)
 149 {
 150     int max_bus;
 151     DriveInfo *dinfo;
 152
 153     max_bus = -1;
 154     QTAILQ_FOREACH(dinfo, &drives, next) {
 155         if(dinfo->type == type &&
 156            dinfo->bus > max_bus)
 157             max_bus = dinfo->bus;
 158     }
 159     return max_bus;
 160 }
 161
 162 /* Get a block device.  This should only be used for single-drive devices
 163    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 164    appropriate bus.  */
 165 DriveInfo *drive_get_next(BlockInterfaceType type)
 166 {
 167     static int next_block_unit[IF_COUNT];
 168
 169     return drive_get(type, 0, next_block_unit[type]++);
 170 }
 171
 172 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 173 {
 174     DriveInfo *dinfo;
 175
 176     QTAILQ_FOREACH(dinfo, &drives, next) {
 177         if (dinfo->bdrv == bs) {
 178             return dinfo;
 179         }
 180     }
 181     return NULL;
 182 }
 183
 184 static void bdrv_format_print(void *opaque, const char *name)
 185 {
 186     error_printf(" %s", name);
 187 }
 188
 189 static void drive_uninit(DriveInfo *dinfo)
 190 {
 191     qemu_opts_del(dinfo->opts);
 192     bdrv_delete(dinfo->bdrv);
 193     g_free(dinfo->id);
 194     QTAILQ_REMOVE(&drives, dinfo, next);
 195     g_free(dinfo->serial);
 196     g_free(dinfo);
 197 }
 198
 199 void drive_put_ref(DriveInfo *dinfo)
 200 {
 201     assert(dinfo->refcount);
 202     if (--dinfo->refcount == 0) {
 203         drive_uninit(dinfo);
 204     }
 205 }
 206
 207 void drive_get_ref(DriveInfo *dinfo)
 208 {
 209     dinfo->refcount++;
 210 }
 211
 212 typedef struct {
 213     QEMUBH *bh;
 214     DriveInfo *dinfo;
 215 } DrivePutRefBH;
 216
 217 static void drive_put_ref_bh(void *opaque)
 218 {
 219     DrivePutRefBH *s = opaque;
 220
 221     drive_put_ref(s->dinfo);
 222     qemu_bh_delete(s->bh);
 223     g_free(s);
 224 }
 225
 226 /*
 227  * Release a drive reference in a BH
 228  *
 229  * It is not possible to use drive_put_ref() from a callback function when the
 230  * callers still need the drive.  In such cases we schedule a BH to release the
 231  * reference.
 232  */
 233 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
 234 {
 235     DrivePutRefBH *s;
 236
 237     s = g_new(DrivePutRefBH, 1);
 238     s->bh = qemu_bh_new(drive_put_ref_bh, s);
 239     s->dinfo = dinfo;
 240     qemu_bh_schedule(s->bh);
 241 }
 242
 243 static int parse_block_error_action(const char *buf, bool is_read)
 244 {
 245     if (!strcmp(buf, "ignore")) {
 246         return BLOCKDEV_ON_ERROR_IGNORE;
 247     } else if (!is_read && !strcmp(buf, "enospc")) {
 248         return BLOCKDEV_ON_ERROR_ENOSPC;
 249     } else if (!strcmp(buf, "stop")) {
 250         return BLOCKDEV_ON_ERROR_STOP;
 251     } else if (!strcmp(buf, "report")) {
 252         return BLOCKDEV_ON_ERROR_REPORT;
 253     } else {
 254         error_report("'%s' invalid %s error action",
 255                      buf, is_read ? "read" : "write");
 256         return -1;
 257     }
 258 }
 259
 260 static bool do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
 261 {
 262     bool bps_flag;
 263     bool iops_flag;
 264
 265     assert(io_limits);
 266
 267     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 268                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 269                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 270     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 271                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 272                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 273     if (bps_flag || iops_flag) {
 274         error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 275                          "cannot be used at the same time");
 276         return false;
 277     }
 278
 279     if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 280         io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
 281         io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
 282         io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 283         io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
 284         io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
 285         error_setg(errp, "bps and iops values must be 0 or greater");
 286         return false;
 287     }
 288
 289     return true;
 290 }
 291
 292 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 293 {
 294     const char *buf;
 295     const char *file = NULL;
 296     const char *serial;
 297     const char *mediastr = "";
 298     BlockInterfaceType type;
 299     enum { MEDIA_DISK, MEDIA_CDROM } media;
 300     int bus_id, unit_id;
 301     int cyls, heads, secs, translation;
 302     BlockDriver *drv = NULL;
 303     int max_devs;
 304     int index;
 305     int ro = 0;
 306     int bdrv_flags = 0;
 307     int on_read_error, on_write_error;
 308     const char *devaddr;
 309     DriveInfo *dinfo;
 310     BlockIOLimit io_limits;
 311     int snapshot = 0;
 312     bool copy_on_read;
 313     int ret;
 314     Error *error = NULL;
 315     QemuOpts *opts;
 316     QDict *bs_opts;
 317     const char *id;
 318
 319     translation = BIOS_ATA_TRANSLATION_AUTO;
 320     media = MEDIA_DISK;
 321
 322     /* Check common options by copying from all_opts to opts, all other options
 323      * are stored in bs_opts. */
 324     id = qemu_opts_id(all_opts);
 325     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
 326     if (error_is_set(&error)) {
 327         qerror_report_err(error);
 328         error_free(error);
 329         return NULL;
 330     }
 331
 332     bs_opts = qdict_new();
 333     qemu_opts_to_qdict(all_opts, bs_opts);
 334     qemu_opts_absorb_qdict(opts, bs_opts, &error);
 335     if (error_is_set(&error)) {
 336         qerror_report_err(error);
 337         error_free(error);
 338         return NULL;
 339     }
 340
 341     if (id) {
 342         qdict_del(bs_opts, "id");
 343     }
 344
 345     /* extract parameters */
 346     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 347     unit_id = qemu_opt_get_number(opts, "unit", -1);
 348     index   = qemu_opt_get_number(opts, "index", -1);
 349
 350     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 351     heads = qemu_opt_get_number(opts, "heads", 0);
 352     secs  = qemu_opt_get_number(opts, "secs", 0);
 353
 354     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 355     ro = qemu_opt_get_bool(opts, "readonly", 0);
 356     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 357
 358     file = qemu_opt_get(opts, "file");
 359     serial = qemu_opt_get(opts, "serial");
 360
 361     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 362         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 363             ;
 364         if (type == IF_COUNT) {
 365             error_report("unsupported bus type '%s'", buf);
 366             return NULL;
 367         }
 368     } else {
 369         type = block_default_type;
 370     }
 371
 372     max_devs = if_max_devs[type];
 373
 374     if (cyls || heads || secs) {
 375         if (cyls < 1) {
 376             error_report("invalid physical cyls number");
 377             return NULL;
 378         }
 379         if (heads < 1) {
 380             error_report("invalid physical heads number");
 381             return NULL;
 382         }
 383         if (secs < 1) {
 384             error_report("invalid physical secs number");
 385             return NULL;
 386         }
 387     }
 388
 389     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 390         if (!cyls) {
 391             error_report("'%s' trans must be used with cyls, heads and secs",
 392                          buf);
 393             return NULL;
 394         }
 395         if (!strcmp(buf, "none"))
 396             translation = BIOS_ATA_TRANSLATION_NONE;
 397         else if (!strcmp(buf, "lba"))
 398             translation = BIOS_ATA_TRANSLATION_LBA;
 399         else if (!strcmp(buf, "auto"))
 400             translation = BIOS_ATA_TRANSLATION_AUTO;
 401         else {
 402             error_report("'%s' invalid translation type", buf);
 403             return NULL;
 404         }
 405     }
 406
 407     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 408         if (!strcmp(buf, "disk")) {
 409             media = MEDIA_DISK;
 410         } else if (!strcmp(buf, "cdrom")) {
 411             if (cyls || secs || heads) {
 412                 error_report("CHS can't be set with media=%s", buf);
 413                 return NULL;
 414             }
 415             media = MEDIA_CDROM;
 416         } else {
 417             error_report("'%s' invalid media", buf);
 418             return NULL;
 419         }
 420     }
 421
 422     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
 423         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
 424             error_report("invalid discard option");
 425             return NULL;
 426         }
 427     }
 428
 429     bdrv_flags |= BDRV_O_CACHE_WB;
 430     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 431         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 432             error_report("invalid cache option");
 433             return NULL;
 434         }
 435     }
 436
 437 #ifdef CONFIG_LINUX_AIO
 438     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 439         if (!strcmp(buf, "native")) {
 440             bdrv_flags |= BDRV_O_NATIVE_AIO;
 441         } else if (!strcmp(buf, "threads")) {
 442             /* this is the default */
 443         } else {
 444            error_report("invalid aio option");
 445            return NULL;
 446         }
 447     }
 448 #endif
 449
 450     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 451         if (is_help_option(buf)) {
 452             error_printf("Supported formats:");
 453             bdrv_iterate_format(bdrv_format_print, NULL);
 454             error_printf("\n");
 455             return NULL;
 456         }
 457         drv = bdrv_find_whitelisted_format(buf);
 458         if (!drv) {
 459             error_report("'%s' invalid format", buf);
 460             return NULL;
 461         }
 462     }
 463
 464     /* disk I/O throttling */
 465     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 466                            qemu_opt_get_number(opts, "bps", 0);
 467     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 468                            qemu_opt_get_number(opts, "bps_rd", 0);
 469     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 470                            qemu_opt_get_number(opts, "bps_wr", 0);
 471     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 472                            qemu_opt_get_number(opts, "iops", 0);
 473     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 474                            qemu_opt_get_number(opts, "iops_rd", 0);
 475     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 476                            qemu_opt_get_number(opts, "iops_wr", 0);
 477
 478     if (!do_check_io_limits(&io_limits, &error)) {
 479         error_report("%s", error_get_pretty(error));
 480         error_free(error);
 481         return NULL;
 482     }
 483
 484     if (qemu_opt_get(opts, "boot") != NULL) {
 485         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 486                 "ignored. Future versions will reject this parameter. Please "
 487                 "update your scripts.\n");
 488     }
 489
 490     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 491     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 492         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 493             error_report("werror is not supported by this bus type");
 494             return NULL;
 495         }
 496
 497         on_write_error = parse_block_error_action(buf, 0);
 498         if (on_write_error < 0) {
 499             return NULL;
 500         }
 501     }
 502
 503     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 504     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 505         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 506             error_report("rerror is not supported by this bus type");
 507             return NULL;
 508         }
 509
 510         on_read_error = parse_block_error_action(buf, 1);
 511         if (on_read_error < 0) {
 512             return NULL;
 513         }
 514     }
 515
 516     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 517         if (type != IF_VIRTIO) {
 518             error_report("addr is not supported by this bus type");
 519             return NULL;
 520         }
 521     }
 522
 523     /* compute bus and unit according index */
 524
 525     if (index != -1) {
 526         if (bus_id != 0 || unit_id != -1) {
 527             error_report("index cannot be used with bus and unit");
 528             return NULL;
 529         }
 530         bus_id = drive_index_to_bus_id(type, index);
 531         unit_id = drive_index_to_unit_id(type, index);
 532     }
 533
 534     /* if user doesn't specify a unit_id,
 535      * try to find the first free
 536      */
 537
 538     if (unit_id == -1) {
 539        unit_id = 0;
 540        while (drive_get(type, bus_id, unit_id) != NULL) {
 541            unit_id++;
 542            if (max_devs && unit_id >= max_devs) {
 543                unit_id -= max_devs;
 544                bus_id++;
 545            }
 546        }
 547     }
 548
 549     /* check unit id */
 550
 551     if (max_devs && unit_id >= max_devs) {
 552         error_report("unit %d too big (max is %d)",
 553                      unit_id, max_devs - 1);
 554         return NULL;
 555     }
 556
 557     /*
 558      * catch multiple definitions
 559      */
 560
 561     if (drive_get(type, bus_id, unit_id) != NULL) {
 562         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 563                      bus_id, unit_id, index);
 564         return NULL;
 565     }
 566
 567     /* init */
 568
 569     dinfo = g_malloc0(sizeof(*dinfo));
 570     if ((buf = qemu_opts_id(opts)) != NULL) {
 571         dinfo->id = g_strdup(buf);
 572     } else {
 573         /* no id supplied -> create one */
 574         dinfo->id = g_malloc0(32);
 575         if (type == IF_IDE || type == IF_SCSI)
 576             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 577         if (max_devs)
 578             snprintf(dinfo->id, 32, "%s%i%s%i",
 579                      if_name[type], bus_id, mediastr, unit_id);
 580         else
 581             snprintf(dinfo->id, 32, "%s%s%i",
 582                      if_name[type], mediastr, unit_id);
 583     }
 584     dinfo->bdrv = bdrv_new(dinfo->id);
 585     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 586     dinfo->bdrv->read_only = ro;
 587     dinfo->devaddr = devaddr;
 588     dinfo->type = type;
 589     dinfo->bus = bus_id;
 590     dinfo->unit = unit_id;
 591     dinfo->cyls = cyls;
 592     dinfo->heads = heads;
 593     dinfo->secs = secs;
 594     dinfo->trans = translation;
 595     dinfo->opts = all_opts;
 596     dinfo->refcount = 1;
 597     if (serial != NULL) {
 598         dinfo->serial = g_strdup(serial);
 599     }
 600     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 601
 602     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 603
 604     /* disk I/O throttling */
 605     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 606
 607     switch(type) {
 608     case IF_IDE:
 609     case IF_SCSI:
 610     case IF_XEN:
 611     case IF_NONE:
 612         dinfo->media_cd = media == MEDIA_CDROM;
 613         break;
 614     case IF_SD:
 615     case IF_FLOPPY:
 616     case IF_PFLASH:
 617     case IF_MTD:
 618         break;
 619     case IF_VIRTIO:
 620     {
 621         /* add virtio block device */
 622         QemuOpts *devopts;
 623         devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
 624         if (arch_type == QEMU_ARCH_S390X) {
 625             qemu_opt_set(devopts, "driver", "virtio-blk-s390");
 626         } else {
 627             qemu_opt_set(devopts, "driver", "virtio-blk-pci");
 628         }
 629         qemu_opt_set(devopts, "drive", dinfo->id);
 630         if (devaddr)
 631             qemu_opt_set(devopts, "addr", devaddr);
 632         break;
 633     }
 634     default:
 635         abort();
 636     }
 637     if (!file || !*file) {
 638         return dinfo;
 639     }
 640     if (snapshot) {
 641         /* always use cache=unsafe with snapshot */
 642         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 643         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 644     }
 645
 646     if (copy_on_read) {
 647         bdrv_flags |= BDRV_O_COPY_ON_READ;
 648     }
 649
 650     if (runstate_check(RUN_STATE_INMIGRATE)) {
 651         bdrv_flags |= BDRV_O_INCOMING;
 652     }
 653
 654     if (media == MEDIA_CDROM) {
 655         /* CDROM is fine for any interface, don't check.  */
 656         ro = 1;
 657     } else if (ro == 1) {
 658         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 659             type != IF_NONE && type != IF_PFLASH) {
 660             error_report("readonly not supported by this bus type");
 661             goto err;
 662         }
 663     }
 664
 665     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 666
 667     if (ro && copy_on_read) {
 668         error_report("warning: disabling copy_on_read on readonly drive");
 669     }
 670
 671     ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv);
 672     bs_opts = NULL;
 673
 674     if (ret < 0) {
 675         if (ret == -EMEDIUMTYPE) {
 676             error_report("could not open disk image %s: not in %s format",
 677                          file, drv->format_name);
 678         } else {
 679             error_report("could not open disk image %s: %s",
 680                          file, strerror(-ret));
 681         }
 682         goto err;
 683     }
 684
 685     if (bdrv_key_required(dinfo->bdrv))
 686         autostart = 0;
 687
 688     qemu_opts_del(opts);
 689
 690     return dinfo;
 691
 692 err:
 693     qemu_opts_del(opts);
 694     QDECREF(bs_opts);
 695     bdrv_delete(dinfo->bdrv);
 696     g_free(dinfo->id);
 697     QTAILQ_REMOVE(&drives, dinfo, next);
 698     g_free(dinfo);
 699     return NULL;
 700 }
 701
 702 void do_commit(Monitor *mon, const QDict *qdict)
 703 {
 704     const char *device = qdict_get_str(qdict, "device");
 705     BlockDriverState *bs;
 706     int ret;
 707
 708     if (!strcmp(device, "all")) {
 709         ret = bdrv_commit_all();
 710     } else {
 711         bs = bdrv_find(device);
 712         if (!bs) {
 713             monitor_printf(mon, "Device '%s' not found\n", device);
 714             return;
 715         }
 716         ret = bdrv_commit(bs);
 717     }
 718     if (ret < 0) {
 719         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 720                        strerror(-ret));
 721     }
 722 }
 723
 724 static void blockdev_do_action(int kind, void *data, Error **errp)
 725 {
 726     BlockdevAction action;
 727     BlockdevActionList list;
 728
 729     action.kind = kind;
 730     action.data = data;
 731     list.value = &action;
 732     list.next = NULL;
 733     qmp_transaction(&list, errp);
 734 }
 735
 736 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 737                                 bool has_format, const char *format,
 738                                 bool has_mode, enum NewImageMode mode,
 739                                 Error **errp)
 740 {
 741     BlockdevSnapshot snapshot = {
 742         .device = (char *) device,
 743         .snapshot_file = (char *) snapshot_file,
 744         .has_format = has_format,
 745         .format = (char *) format,
 746         .has_mode = has_mode,
 747         .mode = mode,
 748     };
 749     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 750                        errp);
 751 }
 752
 753
 754 /* New and old BlockDriverState structs for group snapshots */
 755 typedef struct BlkTransactionStates {
 756     BlockDriverState *old_bs;
 757     BlockDriverState *new_bs;
 758     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 759 } BlkTransactionStates;
 760
 761 /*
 762  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 763  *  then we do not pivot any of the devices in the group, and abandon the
 764  *  snapshots
 765  */
 766 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 767 {
 768     int ret = 0;
 769     BlockdevActionList *dev_entry = dev_list;
 770     BlkTransactionStates *states, *next;
 771     Error *local_err = NULL;
 772
 773     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 774     QSIMPLEQ_INIT(&snap_bdrv_states);
 775
 776     /* drain all i/o before any snapshots */
 777     bdrv_drain_all();
 778
 779     /* We don't do anything in this loop that commits us to the snapshot */
 780     while (NULL != dev_entry) {
 781         BlockdevAction *dev_info = NULL;
 782         BlockDriver *proto_drv;
 783         BlockDriver *drv;
 784         int flags;
 785         enum NewImageMode mode;
 786         const char *new_image_file;
 787         const char *device;
 788         const char *format = "qcow2";
 789
 790         dev_info = dev_entry->value;
 791         dev_entry = dev_entry->next;
 792
 793         states = g_malloc0(sizeof(BlkTransactionStates));
 794         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 795
 796         switch (dev_info->kind) {
 797         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 798             device = dev_info->blockdev_snapshot_sync->device;
 799             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 800                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 801             }
 802             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 803             if (dev_info->blockdev_snapshot_sync->has_format) {
 804                 format = dev_info->blockdev_snapshot_sync->format;
 805             }
 806             mode = dev_info->blockdev_snapshot_sync->mode;
 807             break;
 808         default:
 809             abort();
 810         }
 811
 812         drv = bdrv_find_format(format);
 813         if (!drv) {
 814             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 815             goto delete_and_fail;
 816         }
 817
 818         states->old_bs = bdrv_find(device);
 819         if (!states->old_bs) {
 820             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 821             goto delete_and_fail;
 822         }
 823
 824         if (!bdrv_is_inserted(states->old_bs)) {
 825             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 826             goto delete_and_fail;
 827         }
 828
 829         if (bdrv_in_use(states->old_bs)) {
 830             error_set(errp, QERR_DEVICE_IN_USE, device);
 831             goto delete_and_fail;
 832         }
 833
 834         if (!bdrv_is_read_only(states->old_bs)) {
 835             if (bdrv_flush(states->old_bs)) {
 836                 error_set(errp, QERR_IO_ERROR);
 837                 goto delete_and_fail;
 838             }
 839         }
 840
 841         flags = states->old_bs->open_flags;
 842
 843         proto_drv = bdrv_find_protocol(new_image_file);
 844         if (!proto_drv) {
 845             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 846             goto delete_and_fail;
 847         }
 848
 849         /* create new image w/backing file */
 850         if (mode != NEW_IMAGE_MODE_EXISTING) {
 851             bdrv_img_create(new_image_file, format,
 852                             states->old_bs->filename,
 853                             states->old_bs->drv->format_name,
 854                             NULL, -1, flags, &local_err, false);
 855             if (error_is_set(&local_err)) {
 856                 error_propagate(errp, local_err);
 857                 goto delete_and_fail;
 858             }
 859         }
 860
 861         /* We will manually add the backing_hd field to the bs later */
 862         states->new_bs = bdrv_new("");
 863         /* TODO Inherit bs->options or only take explicit options with an
 864          * extended QMP command? */
 865         ret = bdrv_open(states->new_bs, new_image_file, NULL,
 866                         flags | BDRV_O_NO_BACKING, drv);
 867         if (ret != 0) {
 868             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 869             goto delete_and_fail;
 870         }
 871     }
 872
 873
 874     /* Now we are going to do the actual pivot.  Everything up to this point
 875      * is reversible, but we are committed at this point */
 876     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 877         /* This removes our old bs from the bdrv_states, and adds the new bs */
 878         bdrv_append(states->new_bs, states->old_bs);
 879         /* We don't need (or want) to use the transactional
 880          * bdrv_reopen_multiple() across all the entries at once, because we
 881          * don't want to abort all of them if one of them fails the reopen */
 882         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 883                     NULL);
 884     }
 885
 886     /* success */
 887     goto exit;
 888
 889 delete_and_fail:
 890     /*
 891     * failure, and it is all-or-none; abandon each new bs, and keep using
 892     * the original bs for all images
 893     */
 894     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 895         if (states->new_bs) {
 896              bdrv_delete(states->new_bs);
 897         }
 898     }
 899 exit:
 900     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 901         g_free(states);
 902     }
 903 }
 904
 905
 906 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 907 {
 908     if (bdrv_in_use(bs)) {
 909         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 910         return;
 911     }
 912     if (!bdrv_dev_has_removable_media(bs)) {
 913         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 914         return;
 915     }
 916
 917     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 918         bdrv_dev_eject_request(bs, force);
 919         if (!force) {
 920             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 921             return;
 922         }
 923     }
 924
 925     bdrv_close(bs);
 926 }
 927
 928 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 929 {
 930     BlockDriverState *bs;
 931
 932     bs = bdrv_find(device);
 933     if (!bs) {
 934         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 935         return;
 936     }
 937
 938     eject_device(bs, force, errp);
 939 }
 940
 941 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 942 {
 943     BlockDriverState *bs;
 944     int err;
 945
 946     bs = bdrv_find(device);
 947     if (!bs) {
 948         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 949         return;
 950     }
 951
 952     err = bdrv_set_key(bs, password);
 953     if (err == -EINVAL) {
 954         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 955         return;
 956     } else if (err < 0) {
 957         error_set(errp, QERR_INVALID_PASSWORD);
 958         return;
 959     }
 960 }
 961
 962 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 963                                     int bdrv_flags, BlockDriver *drv,
 964                                     const char *password, Error **errp)
 965 {
 966     if (bdrv_open(bs, filename, NULL, bdrv_flags, drv) < 0) {
 967         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 968         return;
 969     }
 970
 971     if (bdrv_key_required(bs)) {
 972         if (password) {
 973             if (bdrv_set_key(bs, password) < 0) {
 974                 error_set(errp, QERR_INVALID_PASSWORD);
 975             }
 976         } else {
 977             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 978                       bdrv_get_encrypted_filename(bs));
 979         }
 980     } else if (password) {
 981         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 982     }
 983 }
 984
 985 void qmp_change_blockdev(const char *device, const char *filename,
 986                          bool has_format, const char *format, Error **errp)
 987 {
 988     BlockDriverState *bs;
 989     BlockDriver *drv = NULL;
 990     int bdrv_flags;
 991     Error *err = NULL;
 992
 993     bs = bdrv_find(device);
 994     if (!bs) {
 995         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 996         return;
 997     }
 998
 999     if (format) {
1000         drv = bdrv_find_whitelisted_format(format);
1001         if (!drv) {
1002             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1003             return;
1004         }
1005     }
1006
1007     eject_device(bs, 0, &err);
1008     if (error_is_set(&err)) {
1009         error_propagate(errp, err);
1010         return;
1011     }
1012
1013     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1014     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1015
1016     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1017 }
1018
1019 /* throttling disk I/O limits */
1020 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1021                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
1022                                int64_t iops_wr, Error **errp)
1023 {
1024     BlockIOLimit io_limits;
1025     BlockDriverState *bs;
1026
1027     bs = bdrv_find(device);
1028     if (!bs) {
1029         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1030         return;
1031     }
1032
1033     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
1034     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
1035     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
1036     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
1037     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
1038     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
1039
1040     if (!do_check_io_limits(&io_limits, errp)) {
1041         return;
1042     }
1043
1044     bs->io_limits = io_limits;
1045     bs->slice_time = BLOCK_IO_SLICE_TIME;
1046
1047     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
1048         bdrv_io_limits_enable(bs);
1049     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
1050         bdrv_io_limits_disable(bs);
1051     } else {
1052         if (bs->block_timer) {
1053             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
1054         }
1055     }
1056 }
1057
1058 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1059 {
1060     const char *id = qdict_get_str(qdict, "id");
1061     BlockDriverState *bs;
1062
1063     bs = bdrv_find(id);
1064     if (!bs) {
1065         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1066         return -1;
1067     }
1068     if (bdrv_in_use(bs)) {
1069         qerror_report(QERR_DEVICE_IN_USE, id);
1070         return -1;
1071     }
1072
1073     /* quiesce block driver; prevent further io */
1074     bdrv_drain_all();
1075     bdrv_flush(bs);
1076     bdrv_close(bs);
1077
1078     /* if we have a device attached to this BlockDriverState
1079      * then we need to make the drive anonymous until the device
1080      * can be removed.  If this is a drive with no device backing
1081      * then we can just get rid of the block driver state right here.
1082      */
1083     if (bdrv_get_attached_dev(bs)) {
1084         bdrv_make_anon(bs);
1085     } else {
1086         drive_uninit(drive_get_by_blockdev(bs));
1087     }
1088
1089     return 0;
1090 }
1091
1092 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1093 {
1094     BlockDriverState *bs;
1095
1096     bs = bdrv_find(device);
1097     if (!bs) {
1098         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1099         return;
1100     }
1101
1102     if (size < 0) {
1103         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1104         return;
1105     }
1106
1107     switch (bdrv_truncate(bs, size)) {
1108     case 0:
1109         break;
1110     case -ENOMEDIUM:
1111         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1112         break;
1113     case -ENOTSUP:
1114         error_set(errp, QERR_UNSUPPORTED);
1115         break;
1116     case -EACCES:
1117         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1118         break;
1119     case -EBUSY:
1120         error_set(errp, QERR_DEVICE_IN_USE, device);
1121         break;
1122     default:
1123         error_set(errp, QERR_UNDEFINED_ERROR);
1124         break;
1125     }
1126 }
1127
1128 static void block_job_cb(void *opaque, int ret)
1129 {
1130     BlockDriverState *bs = opaque;
1131     QObject *obj;
1132
1133     trace_block_job_cb(bs, bs->job, ret);
1134
1135     assert(bs->job);
1136     obj = qobject_from_block_job(bs->job);
1137     if (ret < 0) {
1138         QDict *dict = qobject_to_qdict(obj);
1139         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1140     }
1141
1142     if (block_job_is_cancelled(bs->job)) {
1143         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1144     } else {
1145         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1146     }
1147     qobject_decref(obj);
1148
1149     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1150 }
1151
1152 void qmp_block_stream(const char *device, bool has_base,
1153                       const char *base, bool has_speed, int64_t speed,
1154                       bool has_on_error, BlockdevOnError on_error,
1155                       Error **errp)
1156 {
1157     BlockDriverState *bs;
1158     BlockDriverState *base_bs = NULL;
1159     Error *local_err = NULL;
1160
1161     if (!has_on_error) {
1162         on_error = BLOCKDEV_ON_ERROR_REPORT;
1163     }
1164
1165     bs = bdrv_find(device);
1166     if (!bs) {
1167         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1168         return;
1169     }
1170
1171     if (base) {
1172         base_bs = bdrv_find_backing_image(bs, base);
1173         if (base_bs == NULL) {
1174             error_set(errp, QERR_BASE_NOT_FOUND, base);
1175             return;
1176         }
1177     }
1178
1179     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1180                  on_error, block_job_cb, bs, &local_err);
1181     if (error_is_set(&local_err)) {
1182         error_propagate(errp, local_err);
1183         return;
1184     }
1185
1186     /* Grab a reference so hotplug does not delete the BlockDriverState from
1187      * underneath us.
1188      */
1189     drive_get_ref(drive_get_by_blockdev(bs));
1190
1191     trace_qmp_block_stream(bs, bs->job);
1192 }
1193
1194 void qmp_block_commit(const char *device,
1195                       bool has_base, const char *base, const char *top,
1196                       bool has_speed, int64_t speed,
1197                       Error **errp)
1198 {
1199     BlockDriverState *bs;
1200     BlockDriverState *base_bs, *top_bs;
1201     Error *local_err = NULL;
1202     /* This will be part of the QMP command, if/when the
1203      * BlockdevOnError change for blkmirror makes it in
1204      */
1205     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1206
1207     /* drain all i/o before commits */
1208     bdrv_drain_all();
1209
1210     bs = bdrv_find(device);
1211     if (!bs) {
1212         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1213         return;
1214     }
1215
1216     /* default top_bs is the active layer */
1217     top_bs = bs;
1218
1219     if (top) {
1220         if (strcmp(bs->filename, top) != 0) {
1221             top_bs = bdrv_find_backing_image(bs, top);
1222         }
1223     }
1224
1225     if (top_bs == NULL) {
1226         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1227         return;
1228     }
1229
1230     if (has_base && base) {
1231         base_bs = bdrv_find_backing_image(top_bs, base);
1232     } else {
1233         base_bs = bdrv_find_base(top_bs);
1234     }
1235
1236     if (base_bs == NULL) {
1237         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1238         return;
1239     }
1240
1241     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1242                 &local_err);
1243     if (local_err != NULL) {
1244         error_propagate(errp, local_err);
1245         return;
1246     }
1247     /* Grab a reference so hotplug does not delete the BlockDriverState from
1248      * underneath us.
1249      */
1250     drive_get_ref(drive_get_by_blockdev(bs));
1251 }
1252
1253 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1254
1255 void qmp_drive_mirror(const char *device, const char *target,
1256                       bool has_format, const char *format,
1257                       enum MirrorSyncMode sync,
1258                       bool has_mode, enum NewImageMode mode,
1259                       bool has_speed, int64_t speed,
1260                       bool has_granularity, uint32_t granularity,
1261                       bool has_buf_size, int64_t buf_size,
1262                       bool has_on_source_error, BlockdevOnError on_source_error,
1263                       bool has_on_target_error, BlockdevOnError on_target_error,
1264                       Error **errp)
1265 {
1266     BlockDriverState *bs;
1267     BlockDriverState *source, *target_bs;
1268     BlockDriver *proto_drv;
1269     BlockDriver *drv = NULL;
1270     Error *local_err = NULL;
1271     int flags;
1272     uint64_t size;
1273     int ret;
1274
1275     if (!has_speed) {
1276         speed = 0;
1277     }
1278     if (!has_on_source_error) {
1279         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1280     }
1281     if (!has_on_target_error) {
1282         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1283     }
1284     if (!has_mode) {
1285         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1286     }
1287     if (!has_granularity) {
1288         granularity = 0;
1289     }
1290     if (!has_buf_size) {
1291         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1292     }
1293
1294     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1295         error_set(errp, QERR_INVALID_PARAMETER, device);
1296         return;
1297     }
1298     if (granularity & (granularity - 1)) {
1299         error_set(errp, QERR_INVALID_PARAMETER, device);
1300         return;
1301     }
1302
1303     bs = bdrv_find(device);
1304     if (!bs) {
1305         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1306         return;
1307     }
1308
1309     if (!bdrv_is_inserted(bs)) {
1310         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1311         return;
1312     }
1313
1314     if (!has_format) {
1315         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1316     }
1317     if (format) {
1318         drv = bdrv_find_format(format);
1319         if (!drv) {
1320             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1321             return;
1322         }
1323     }
1324
1325     if (bdrv_in_use(bs)) {
1326         error_set(errp, QERR_DEVICE_IN_USE, device);
1327         return;
1328     }
1329
1330     flags = bs->open_flags | BDRV_O_RDWR;
1331     source = bs->backing_hd;
1332     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1333         sync = MIRROR_SYNC_MODE_FULL;
1334     }
1335
1336     proto_drv = bdrv_find_protocol(target);
1337     if (!proto_drv) {
1338         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1339         return;
1340     }
1341
1342     bdrv_get_geometry(bs, &size);
1343     size *= 512;
1344     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1345         /* create new image w/o backing file */
1346         assert(format && drv);
1347         bdrv_img_create(target, format,
1348                         NULL, NULL, NULL, size, flags, &local_err, false);
1349     } else {
1350         switch (mode) {
1351         case NEW_IMAGE_MODE_EXISTING:
1352             ret = 0;
1353             break;
1354         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1355             /* create new image with backing file */
1356             bdrv_img_create(target, format,
1357                             source->filename,
1358                             source->drv->format_name,
1359                             NULL, size, flags, &local_err, false);
1360             break;
1361         default:
1362             abort();
1363         }
1364     }
1365
1366     if (error_is_set(&local_err)) {
1367         error_propagate(errp, local_err);
1368         return;
1369     }
1370
1371     /* Mirroring takes care of copy-on-write using the source's backing
1372      * file.
1373      */
1374     target_bs = bdrv_new("");
1375     ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
1376
1377     if (ret < 0) {
1378         bdrv_delete(target_bs);
1379         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1380         return;
1381     }
1382
1383     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1384                  on_source_error, on_target_error,
1385                  block_job_cb, bs, &local_err);
1386     if (local_err != NULL) {
1387         bdrv_delete(target_bs);
1388         error_propagate(errp, local_err);
1389         return;
1390     }
1391
1392     /* Grab a reference so hotplug does not delete the BlockDriverState from
1393      * underneath us.
1394      */
1395     drive_get_ref(drive_get_by_blockdev(bs));
1396 }
1397
1398 static BlockJob *find_block_job(const char *device)
1399 {
1400     BlockDriverState *bs;
1401
1402     bs = bdrv_find(device);
1403     if (!bs || !bs->job) {
1404         return NULL;
1405     }
1406     return bs->job;
1407 }
1408
1409 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1410 {
1411     BlockJob *job = find_block_job(device);
1412
1413     if (!job) {
1414         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1415         return;
1416     }
1417
1418     block_job_set_speed(job, speed, errp);
1419 }
1420
1421 void qmp_block_job_cancel(const char *device,
1422                           bool has_force, bool force, Error **errp)
1423 {
1424     BlockJob *job = find_block_job(device);
1425
1426     if (!has_force) {
1427         force = false;
1428     }
1429
1430     if (!job) {
1431         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1432         return;
1433     }
1434     if (job->paused && !force) {
1435         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1436         return;
1437     }
1438
1439     trace_qmp_block_job_cancel(job);
1440     block_job_cancel(job);
1441 }
1442
1443 void qmp_block_job_pause(const char *device, Error **errp)
1444 {
1445     BlockJob *job = find_block_job(device);
1446
1447     if (!job) {
1448         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1449         return;
1450     }
1451
1452     trace_qmp_block_job_pause(job);
1453     block_job_pause(job);
1454 }
1455
1456 void qmp_block_job_resume(const char *device, Error **errp)
1457 {
1458     BlockJob *job = find_block_job(device);
1459
1460     if (!job) {
1461         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1462         return;
1463     }
1464
1465     trace_qmp_block_job_resume(job);
1466     block_job_resume(job);
1467 }
1468
1469 void qmp_block_job_complete(const char *device, Error **errp)
1470 {
1471     BlockJob *job = find_block_job(device);
1472
1473     if (!job) {
1474         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1475         return;
1476     }
1477
1478     trace_qmp_block_job_complete(job);
1479     block_job_complete(job, errp);
1480 }
1481
1482 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1483 {
1484     BlockJobInfoList **prev = opaque;
1485     BlockJob *job = bs->job;
1486
1487     if (job) {
1488         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1489         elem->value = block_job_query(bs->job);
1490         (*prev)->next = elem;
1491         *prev = elem;
1492     }
1493 }
1494
1495 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1496 {
1497     /* Dummy is a fake list element for holding the head pointer */
1498     BlockJobInfoList dummy = {};
1499     BlockJobInfoList *prev = &dummy;
1500     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1501     return dummy.next;
1502 }
1503
1504 QemuOptsList qemu_common_drive_opts = {
1505     .name = "drive",
1506     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
1507     .desc = {
1508         {
1509             .name = "bus",
1510             .type = QEMU_OPT_NUMBER,
1511             .help = "bus number",
1512         },{
1513             .name = "unit",
1514             .type = QEMU_OPT_NUMBER,
1515             .help = "unit number (i.e. lun for scsi)",
1516         },{
1517             .name = "if",
1518             .type = QEMU_OPT_STRING,
1519             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1520         },{
1521             .name = "index",
1522             .type = QEMU_OPT_NUMBER,
1523             .help = "index number",
1524         },{
1525             .name = "cyls",
1526             .type = QEMU_OPT_NUMBER,
1527             .help = "number of cylinders (ide disk geometry)",
1528         },{
1529             .name = "heads",
1530             .type = QEMU_OPT_NUMBER,
1531             .help = "number of heads (ide disk geometry)",
1532         },{
1533             .name = "secs",
1534             .type = QEMU_OPT_NUMBER,
1535             .help = "number of sectors (ide disk geometry)",
1536         },{
1537             .name = "trans",
1538             .type = QEMU_OPT_STRING,
1539             .help = "chs translation (auto, lba. none)",
1540         },{
1541             .name = "media",
1542             .type = QEMU_OPT_STRING,
1543             .help = "media type (disk, cdrom)",
1544         },{
1545             .name = "snapshot",
1546             .type = QEMU_OPT_BOOL,
1547             .help = "enable/disable snapshot mode",
1548         },{
1549             .name = "file",
1550             .type = QEMU_OPT_STRING,
1551             .help = "disk image",
1552         },{
1553             .name = "discard",
1554             .type = QEMU_OPT_STRING,
1555             .help = "discard operation (ignore/off, unmap/on)",
1556         },{
1557             .name = "cache",
1558             .type = QEMU_OPT_STRING,
1559             .help = "host cache usage (none, writeback, writethrough, "
1560                     "directsync, unsafe)",
1561         },{
1562             .name = "aio",
1563             .type = QEMU_OPT_STRING,
1564             .help = "host AIO implementation (threads, native)",
1565         },{
1566             .name = "format",
1567             .type = QEMU_OPT_STRING,
1568             .help = "disk format (raw, qcow2, ...)",
1569         },{
1570             .name = "serial",
1571             .type = QEMU_OPT_STRING,
1572             .help = "disk serial number",
1573         },{
1574             .name = "rerror",
1575             .type = QEMU_OPT_STRING,
1576             .help = "read error action",
1577         },{
1578             .name = "werror",
1579             .type = QEMU_OPT_STRING,
1580             .help = "write error action",
1581         },{
1582             .name = "addr",
1583             .type = QEMU_OPT_STRING,
1584             .help = "pci address (virtio only)",
1585         },{
1586             .name = "readonly",
1587             .type = QEMU_OPT_BOOL,
1588             .help = "open drive file as read-only",
1589         },{
1590             .name = "iops",
1591             .type = QEMU_OPT_NUMBER,
1592             .help = "limit total I/O operations per second",
1593         },{
1594             .name = "iops_rd",
1595             .type = QEMU_OPT_NUMBER,
1596             .help = "limit read operations per second",
1597         },{
1598             .name = "iops_wr",
1599             .type = QEMU_OPT_NUMBER,
1600             .help = "limit write operations per second",
1601         },{
1602             .name = "bps",
1603             .type = QEMU_OPT_NUMBER,
1604             .help = "limit total bytes per second",
1605         },{
1606             .name = "bps_rd",
1607             .type = QEMU_OPT_NUMBER,
1608             .help = "limit read bytes per second",
1609         },{
1610             .name = "bps_wr",
1611             .type = QEMU_OPT_NUMBER,
1612             .help = "limit write bytes per second",
1613         },{
1614             .name = "copy-on-read",
1615             .type = QEMU_OPT_BOOL,
1616             .help = "copy read data from backing file into image file",
1617         },{
1618             .name = "boot",
1619             .type = QEMU_OPT_BOOL,
1620             .help = "(deprecated, ignored)",
1621         },
1622         { /* end of list */ }
1623     },
1624 };
1625
1626 QemuOptsList qemu_drive_opts = {
1627     .name = "drive",
1628     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1629     .desc = {
1630         /*
1631          * no elements => accept any params
1632          * validation will happen later
1633          */
1634         { /* end of list */ }
1635     },
1636 };