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  * This file incorporates work covered by the following copyright and
  10  * permission notice:
  11  *
  12  * Copyright (c) 2003-2008 Fabrice Bellard
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this software and associated documentation files (the "Software"), to deal
  16  * in the Software without restriction, including without limitation the rights
  17  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  18  * copies of the Software, and to permit persons to whom the Software is
  19  * furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  27  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  30  * THE SOFTWARE.
  31  */
  32
  33 #include "sysemu/blockdev.h"
  34 #include "hw/block/block.h"
  35 #include "block/blockjob.h"
  36 #include "monitor/monitor.h"
  37 #include "qapi/qmp/qerror.h"
  38 #include "qemu/option.h"
  39 #include "qemu/config-file.h"
  40 #include "qapi/qmp/types.h"
  41 #include "sysemu/sysemu.h"
  42 #include "block/block_int.h"
  43 #include "qmp-commands.h"
  44 #include "trace.h"
  45 #include "sysemu/arch_init.h"
  46
  47 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  48 extern QemuOptsList qemu_common_drive_opts;
  49
  50 static const char *const if_name[IF_COUNT] = {
  51     [IF_NONE] = "none",
  52     [IF_IDE] = "ide",
  53     [IF_SCSI] = "scsi",
  54     [IF_FLOPPY] = "floppy",
  55     [IF_PFLASH] = "pflash",
  56     [IF_MTD] = "mtd",
  57     [IF_SD] = "sd",
  58     [IF_VIRTIO] = "virtio",
  59     [IF_XEN] = "xen",
  60 };
  61
  62 static const int if_max_devs[IF_COUNT] = {
  63     /*
  64      * Do not change these numbers!  They govern how drive option
  65      * index maps to unit and bus.  That mapping is ABI.
  66      *
  67      * All controllers used to imlement if=T drives need to support
  68      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  69      * Otherwise, some index values map to "impossible" bus, unit
  70      * values.
  71      *
  72      * For instance, if you change [IF_SCSI] to 255, -drive
  73      * if=scsi,index=12 no longer means bus=1,unit=5, but
  74      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  75      * the drive can't be set up.  Regression.
  76      */
  77     [IF_IDE] = 2,
  78     [IF_SCSI] = 7,
  79 };
  80
  81 /*
  82  * We automatically delete the drive when a device using it gets
  83  * unplugged.  Questionable feature, but we can't just drop it.
  84  * Device models call blockdev_mark_auto_del() to schedule the
  85  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  86  * when deletion is actually safe.
  87  */
  88 void blockdev_mark_auto_del(BlockDriverState *bs)
  89 {
  90     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  91
  92     if (bs->job) {
  93         block_job_cancel(bs->job);
  94     }
  95     if (dinfo) {
  96         dinfo->auto_del = 1;
  97     }
  98 }
  99
 100 void blockdev_auto_del(BlockDriverState *bs)
 101 {
 102     DriveInfo *dinfo = drive_get_by_blockdev(bs);
 103
 104     if (dinfo && dinfo->auto_del) {
 105         drive_put_ref(dinfo);
 106     }
 107 }
 108
 109 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
 110 {
 111     int max_devs = if_max_devs[type];
 112     return max_devs ? index / max_devs : 0;
 113 }
 114
 115 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
 116 {
 117     int max_devs = if_max_devs[type];
 118     return max_devs ? index % max_devs : index;
 119 }
 120
 121 QemuOpts *drive_def(const char *optstr)
 122 {
 123     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
 124 }
 125
 126 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 127                     const char *optstr)
 128 {
 129     QemuOpts *opts;
 130     char buf[32];
 131
 132     opts = drive_def(optstr);
 133     if (!opts) {
 134         return NULL;
 135     }
 136     if (type != IF_DEFAULT) {
 137         qemu_opt_set(opts, "if", if_name[type]);
 138     }
 139     if (index >= 0) {
 140         snprintf(buf, sizeof(buf), "%d", index);
 141         qemu_opt_set(opts, "index", buf);
 142     }
 143     if (file)
 144         qemu_opt_set(opts, "file", file);
 145     return opts;
 146 }
 147
 148 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 149 {
 150     DriveInfo *dinfo;
 151
 152     /* seek interface, bus and unit */
 153
 154     QTAILQ_FOREACH(dinfo, &drives, next) {
 155         if (dinfo->type == type &&
 156             dinfo->bus == bus &&
 157             dinfo->unit == unit)
 158             return dinfo;
 159     }
 160
 161     return NULL;
 162 }
 163
 164 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 165 {
 166     return drive_get(type,
 167                      drive_index_to_bus_id(type, index),
 168                      drive_index_to_unit_id(type, index));
 169 }
 170
 171 int drive_get_max_bus(BlockInterfaceType type)
 172 {
 173     int max_bus;
 174     DriveInfo *dinfo;
 175
 176     max_bus = -1;
 177     QTAILQ_FOREACH(dinfo, &drives, next) {
 178         if(dinfo->type == type &&
 179            dinfo->bus > max_bus)
 180             max_bus = dinfo->bus;
 181     }
 182     return max_bus;
 183 }
 184
 185 /* Get a block device.  This should only be used for single-drive devices
 186    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 187    appropriate bus.  */
 188 DriveInfo *drive_get_next(BlockInterfaceType type)
 189 {
 190     static int next_block_unit[IF_COUNT];
 191
 192     return drive_get(type, 0, next_block_unit[type]++);
 193 }
 194
 195 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 196 {
 197     DriveInfo *dinfo;
 198
 199     QTAILQ_FOREACH(dinfo, &drives, next) {
 200         if (dinfo->bdrv == bs) {
 201             return dinfo;
 202         }
 203     }
 204     return NULL;
 205 }
 206
 207 static void bdrv_format_print(void *opaque, const char *name)
 208 {
 209     error_printf(" %s", name);
 210 }
 211
 212 static void drive_uninit(DriveInfo *dinfo)
 213 {
 214     qemu_opts_del(dinfo->opts);
 215     bdrv_unref(dinfo->bdrv);
 216     g_free(dinfo->id);
 217     QTAILQ_REMOVE(&drives, dinfo, next);
 218     g_free(dinfo->serial);
 219     g_free(dinfo);
 220 }
 221
 222 void drive_put_ref(DriveInfo *dinfo)
 223 {
 224     assert(dinfo->refcount);
 225     if (--dinfo->refcount == 0) {
 226         drive_uninit(dinfo);
 227     }
 228 }
 229
 230 void drive_get_ref(DriveInfo *dinfo)
 231 {
 232     dinfo->refcount++;
 233 }
 234
 235 typedef struct {
 236     QEMUBH *bh;
 237     BlockDriverState *bs;
 238 } BDRVPutRefBH;
 239
 240 static void bdrv_put_ref_bh(void *opaque)
 241 {
 242     BDRVPutRefBH *s = opaque;
 243
 244     bdrv_unref(s->bs);
 245     qemu_bh_delete(s->bh);
 246     g_free(s);
 247 }
 248
 249 /*
 250  * Release a BDS reference in a BH
 251  *
 252  * It is not safe to use bdrv_unref() from a callback function when the callers
 253  * still need the BlockDriverState.  In such cases we schedule a BH to release
 254  * the reference.
 255  */
 256 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
 257 {
 258     BDRVPutRefBH *s;
 259
 260     s = g_new(BDRVPutRefBH, 1);
 261     s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
 262     s->bs = bs;
 263     qemu_bh_schedule(s->bh);
 264 }
 265
 266 static int parse_block_error_action(const char *buf, bool is_read)
 267 {
 268     if (!strcmp(buf, "ignore")) {
 269         return BLOCKDEV_ON_ERROR_IGNORE;
 270     } else if (!is_read && !strcmp(buf, "enospc")) {
 271         return BLOCKDEV_ON_ERROR_ENOSPC;
 272     } else if (!strcmp(buf, "stop")) {
 273         return BLOCKDEV_ON_ERROR_STOP;
 274     } else if (!strcmp(buf, "report")) {
 275         return BLOCKDEV_ON_ERROR_REPORT;
 276     } else {
 277         error_report("'%s' invalid %s error action",
 278                      buf, is_read ? "read" : "write");
 279         return -1;
 280     }
 281 }
 282
 283 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
 284 {
 285     if (throttle_conflicting(cfg)) {
 286         error_setg(errp, "bps/iops/max total values and read/write values"
 287                          " cannot be used at the same time");
 288         return false;
 289     }
 290
 291     if (!throttle_is_valid(cfg)) {
 292         error_setg(errp, "bps/iops/maxs values must be 0 or greater");
 293         return false;
 294     }
 295
 296     return true;
 297 }
 298
 299 static DriveInfo *blockdev_init(QemuOpts *all_opts,
 300                                 BlockInterfaceType block_default_type)
 301 {
 302     const char *buf;
 303     const char *file = NULL;
 304     const char *serial;
 305     const char *mediastr = "";
 306     BlockInterfaceType type;
 307     enum { MEDIA_DISK, MEDIA_CDROM } media;
 308     int bus_id, unit_id;
 309     int cyls, heads, secs, translation;
 310     int max_devs;
 311     int index;
 312     int ro = 0;
 313     int bdrv_flags = 0;
 314     int on_read_error, on_write_error;
 315     const char *devaddr;
 316     DriveInfo *dinfo;
 317     ThrottleConfig cfg;
 318     int snapshot = 0;
 319     bool copy_on_read;
 320     int ret;
 321     Error *error = NULL;
 322     QemuOpts *opts;
 323     QDict *bs_opts;
 324     const char *id;
 325     bool has_driver_specific_opts;
 326     BlockDriver *drv = NULL;
 327
 328     translation = BIOS_ATA_TRANSLATION_AUTO;
 329     media = MEDIA_DISK;
 330
 331     /* Check common options by copying from all_opts to opts, all other options
 332      * are stored in bs_opts. */
 333     id = qemu_opts_id(all_opts);
 334     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
 335     if (error_is_set(&error)) {
 336         qerror_report_err(error);
 337         error_free(error);
 338         return NULL;
 339     }
 340
 341     bs_opts = qdict_new();
 342     qemu_opts_to_qdict(all_opts, bs_opts);
 343     qemu_opts_absorb_qdict(opts, bs_opts, &error);
 344     if (error_is_set(&error)) {
 345         qerror_report_err(error);
 346         error_free(error);
 347         return NULL;
 348     }
 349
 350     if (id) {
 351         qdict_del(bs_opts, "id");
 352     }
 353
 354     has_driver_specific_opts = !!qdict_size(bs_opts);
 355
 356     /* extract parameters */
 357     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 358     unit_id = qemu_opt_get_number(opts, "unit", -1);
 359     index   = qemu_opt_get_number(opts, "index", -1);
 360
 361     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 362     heads = qemu_opt_get_number(opts, "heads", 0);
 363     secs  = qemu_opt_get_number(opts, "secs", 0);
 364
 365     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 366     ro = qemu_opt_get_bool(opts, "read-only", 0);
 367     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 368
 369     file = qemu_opt_get(opts, "file");
 370     serial = qemu_opt_get(opts, "serial");
 371
 372     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 373         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 374             ;
 375         if (type == IF_COUNT) {
 376             error_report("unsupported bus type '%s'", buf);
 377             return NULL;
 378         }
 379     } else {
 380         type = block_default_type;
 381     }
 382
 383     max_devs = if_max_devs[type];
 384
 385     if (cyls || heads || secs) {
 386         if (cyls < 1) {
 387             error_report("invalid physical cyls number");
 388             return NULL;
 389         }
 390         if (heads < 1) {
 391             error_report("invalid physical heads number");
 392             return NULL;
 393         }
 394         if (secs < 1) {
 395             error_report("invalid physical secs number");
 396             return NULL;
 397         }
 398     }
 399
 400     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 401         if (!cyls) {
 402             error_report("'%s' trans must be used with cyls, heads and secs",
 403                          buf);
 404             return NULL;
 405         }
 406         if (!strcmp(buf, "none"))
 407             translation = BIOS_ATA_TRANSLATION_NONE;
 408         else if (!strcmp(buf, "lba"))
 409             translation = BIOS_ATA_TRANSLATION_LBA;
 410         else if (!strcmp(buf, "auto"))
 411             translation = BIOS_ATA_TRANSLATION_AUTO;
 412         else {
 413             error_report("'%s' invalid translation type", buf);
 414             return NULL;
 415         }
 416     }
 417
 418     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 419         if (!strcmp(buf, "disk")) {
 420             media = MEDIA_DISK;
 421         } else if (!strcmp(buf, "cdrom")) {
 422             if (cyls || secs || heads) {
 423                 error_report("CHS can't be set with media=%s", buf);
 424                 return NULL;
 425             }
 426             media = MEDIA_CDROM;
 427         } else {
 428             error_report("'%s' invalid media", buf);
 429             return NULL;
 430         }
 431     }
 432
 433     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
 434         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
 435             error_report("invalid discard option");
 436             return NULL;
 437         }
 438     }
 439
 440     if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
 441         bdrv_flags |= BDRV_O_CACHE_WB;
 442     }
 443     if (qemu_opt_get_bool(opts, "cache.direct", false)) {
 444         bdrv_flags |= BDRV_O_NOCACHE;
 445     }
 446     if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
 447         bdrv_flags |= BDRV_O_NO_FLUSH;
 448     }
 449
 450 #ifdef CONFIG_LINUX_AIO
 451     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 452         if (!strcmp(buf, "native")) {
 453             bdrv_flags |= BDRV_O_NATIVE_AIO;
 454         } else if (!strcmp(buf, "threads")) {
 455             /* this is the default */
 456         } else {
 457            error_report("invalid aio option");
 458            return NULL;
 459         }
 460     }
 461 #endif
 462
 463     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 464         if (is_help_option(buf)) {
 465             error_printf("Supported formats:");
 466             bdrv_iterate_format(bdrv_format_print, NULL);
 467             error_printf("\n");
 468             return NULL;
 469         }
 470
 471         drv = bdrv_find_whitelisted_format(buf, ro);
 472         if (!drv) {
 473             if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
 474                 error_report("'%s' can be only used as read-only device.", buf);
 475             } else {
 476                 error_report("'%s' invalid format", buf);
 477             }
 478             return NULL;
 479         }
 480     }
 481
 482     /* disk I/O throttling */
 483     memset(&cfg, 0, sizeof(cfg));
 484     cfg.buckets[THROTTLE_BPS_TOTAL].avg =
 485         qemu_opt_get_number(opts, "throttling.bps-total", 0);
 486     cfg.buckets[THROTTLE_BPS_READ].avg  =
 487         qemu_opt_get_number(opts, "throttling.bps-read", 0);
 488     cfg.buckets[THROTTLE_BPS_WRITE].avg =
 489         qemu_opt_get_number(opts, "throttling.bps-write", 0);
 490     cfg.buckets[THROTTLE_OPS_TOTAL].avg =
 491         qemu_opt_get_number(opts, "throttling.iops-total", 0);
 492     cfg.buckets[THROTTLE_OPS_READ].avg =
 493         qemu_opt_get_number(opts, "throttling.iops-read", 0);
 494     cfg.buckets[THROTTLE_OPS_WRITE].avg =
 495         qemu_opt_get_number(opts, "throttling.iops-write", 0);
 496
 497     cfg.buckets[THROTTLE_BPS_TOTAL].max =
 498         qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
 499     cfg.buckets[THROTTLE_BPS_READ].max  =
 500         qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
 501     cfg.buckets[THROTTLE_BPS_WRITE].max =
 502         qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
 503     cfg.buckets[THROTTLE_OPS_TOTAL].max =
 504         qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
 505     cfg.buckets[THROTTLE_OPS_READ].max =
 506         qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
 507     cfg.buckets[THROTTLE_OPS_WRITE].max =
 508         qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
 509
 510     cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
 511
 512     if (!check_throttle_config(&cfg, &error)) {
 513         error_report("%s", error_get_pretty(error));
 514         error_free(error);
 515         return NULL;
 516     }
 517
 518     if (qemu_opt_get(opts, "boot") != NULL) {
 519         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 520                 "ignored. Future versions will reject this parameter. Please "
 521                 "update your scripts.\n");
 522     }
 523
 524     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 525     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 526         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 527             error_report("werror is not supported by this bus type");
 528             return NULL;
 529         }
 530
 531         on_write_error = parse_block_error_action(buf, 0);
 532         if (on_write_error < 0) {
 533             return NULL;
 534         }
 535     }
 536
 537     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 538     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 539         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 540             error_report("rerror is not supported by this bus type");
 541             return NULL;
 542         }
 543
 544         on_read_error = parse_block_error_action(buf, 1);
 545         if (on_read_error < 0) {
 546             return NULL;
 547         }
 548     }
 549
 550     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 551         if (type != IF_VIRTIO) {
 552             error_report("addr is not supported by this bus type");
 553             return NULL;
 554         }
 555     }
 556
 557     /* compute bus and unit according index */
 558
 559     if (index != -1) {
 560         if (bus_id != 0 || unit_id != -1) {
 561             error_report("index cannot be used with bus and unit");
 562             return NULL;
 563         }
 564         bus_id = drive_index_to_bus_id(type, index);
 565         unit_id = drive_index_to_unit_id(type, index);
 566     }
 567
 568     /* if user doesn't specify a unit_id,
 569      * try to find the first free
 570      */
 571
 572     if (unit_id == -1) {
 573        unit_id = 0;
 574        while (drive_get(type, bus_id, unit_id) != NULL) {
 575            unit_id++;
 576            if (max_devs && unit_id >= max_devs) {
 577                unit_id -= max_devs;
 578                bus_id++;
 579            }
 580        }
 581     }
 582
 583     /* check unit id */
 584
 585     if (max_devs && unit_id >= max_devs) {
 586         error_report("unit %d too big (max is %d)",
 587                      unit_id, max_devs - 1);
 588         return NULL;
 589     }
 590
 591     /*
 592      * catch multiple definitions
 593      */
 594
 595     if (drive_get(type, bus_id, unit_id) != NULL) {
 596         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 597                      bus_id, unit_id, index);
 598         return NULL;
 599     }
 600
 601     /* init */
 602
 603     dinfo = g_malloc0(sizeof(*dinfo));
 604     if ((buf = qemu_opts_id(opts)) != NULL) {
 605         dinfo->id = g_strdup(buf);
 606     } else {
 607         /* no id supplied -> create one */
 608         dinfo->id = g_malloc0(32);
 609         if (type == IF_IDE || type == IF_SCSI)
 610             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 611         if (max_devs)
 612             snprintf(dinfo->id, 32, "%s%i%s%i",
 613                      if_name[type], bus_id, mediastr, unit_id);
 614         else
 615             snprintf(dinfo->id, 32, "%s%s%i",
 616                      if_name[type], mediastr, unit_id);
 617     }
 618     dinfo->bdrv = bdrv_new(dinfo->id);
 619     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 620     dinfo->bdrv->read_only = ro;
 621     dinfo->devaddr = devaddr;
 622     dinfo->type = type;
 623     dinfo->bus = bus_id;
 624     dinfo->unit = unit_id;
 625     dinfo->cyls = cyls;
 626     dinfo->heads = heads;
 627     dinfo->secs = secs;
 628     dinfo->trans = translation;
 629     dinfo->opts = all_opts;
 630     dinfo->refcount = 1;
 631     if (serial != NULL) {
 632         dinfo->serial = g_strdup(serial);
 633     }
 634     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 635
 636     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 637
 638     /* disk I/O throttling */
 639     if (throttle_enabled(&cfg)) {
 640         bdrv_io_limits_enable(dinfo->bdrv);
 641         bdrv_set_io_limits(dinfo->bdrv, &cfg);
 642     }
 643
 644     switch(type) {
 645     case IF_IDE:
 646     case IF_SCSI:
 647     case IF_XEN:
 648     case IF_NONE:
 649         dinfo->media_cd = media == MEDIA_CDROM;
 650         break;
 651     case IF_SD:
 652     case IF_FLOPPY:
 653     case IF_PFLASH:
 654     case IF_MTD:
 655         break;
 656     case IF_VIRTIO:
 657     {
 658         /* add virtio block device */
 659         QemuOpts *devopts;
 660         devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
 661         if (arch_type == QEMU_ARCH_S390X) {
 662             qemu_opt_set(devopts, "driver", "virtio-blk-s390");
 663         } else {
 664             qemu_opt_set(devopts, "driver", "virtio-blk-pci");
 665         }
 666         qemu_opt_set(devopts, "drive", dinfo->id);
 667         if (devaddr)
 668             qemu_opt_set(devopts, "addr", devaddr);
 669         break;
 670     }
 671     default:
 672         abort();
 673     }
 674     if (!file || !*file) {
 675         if (has_driver_specific_opts) {
 676             file = NULL;
 677         } else {
 678             return dinfo;
 679         }
 680     }
 681     if (snapshot) {
 682         /* always use cache=unsafe with snapshot */
 683         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 684         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 685     }
 686
 687     if (copy_on_read) {
 688         bdrv_flags |= BDRV_O_COPY_ON_READ;
 689     }
 690
 691     if (runstate_check(RUN_STATE_INMIGRATE)) {
 692         bdrv_flags |= BDRV_O_INCOMING;
 693     }
 694
 695     if (media == MEDIA_CDROM) {
 696         /* CDROM is fine for any interface, don't check.  */
 697         ro = 1;
 698     } else if (ro == 1) {
 699         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 700             type != IF_NONE && type != IF_PFLASH) {
 701             error_report("read-only not supported by this bus type");
 702             goto err;
 703         }
 704     }
 705
 706     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 707
 708     if (ro && copy_on_read) {
 709         error_report("warning: disabling copy_on_read on read-only drive");
 710     }
 711
 712     QINCREF(bs_opts);
 713     ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
 714
 715     if (ret < 0) {
 716         error_report("could not open disk image %s: %s",
 717                      file ?: dinfo->id, error_get_pretty(error));
 718         goto err;
 719     }
 720
 721     if (bdrv_key_required(dinfo->bdrv))
 722         autostart = 0;
 723
 724     QDECREF(bs_opts);
 725     qemu_opts_del(opts);
 726
 727     return dinfo;
 728
 729 err:
 730     qemu_opts_del(opts);
 731     QDECREF(bs_opts);
 732     bdrv_unref(dinfo->bdrv);
 733     g_free(dinfo->id);
 734     QTAILQ_REMOVE(&drives, dinfo, next);
 735     g_free(dinfo);
 736     return NULL;
 737 }
 738
 739 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
 740 {
 741     const char *value;
 742
 743     value = qemu_opt_get(opts, from);
 744     if (value) {
 745         qemu_opt_set(opts, to, value);
 746         qemu_opt_unset(opts, from);
 747     }
 748 }
 749
 750 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 751 {
 752     const char *value;
 753
 754     /* Change legacy command line options into QMP ones */
 755     qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
 756     qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
 757     qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
 758
 759     qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
 760     qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
 761     qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
 762
 763     qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
 764     qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
 765     qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
 766
 767     qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
 768     qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
 769     qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
 770
 771     qemu_opt_rename(all_opts,
 772                     "iops_size", "throttling.iops-size");
 773
 774     qemu_opt_rename(all_opts, "readonly", "read-only");
 775
 776     value = qemu_opt_get(all_opts, "cache");
 777     if (value) {
 778         int flags = 0;
 779
 780         if (bdrv_parse_cache_flags(value, &flags) != 0) {
 781             error_report("invalid cache option");
 782             return NULL;
 783         }
 784
 785         /* Specific options take precedence */
 786         if (!qemu_opt_get(all_opts, "cache.writeback")) {
 787             qemu_opt_set_bool(all_opts, "cache.writeback",
 788                               !!(flags & BDRV_O_CACHE_WB));
 789         }
 790         if (!qemu_opt_get(all_opts, "cache.direct")) {
 791             qemu_opt_set_bool(all_opts, "cache.direct",
 792                               !!(flags & BDRV_O_NOCACHE));
 793         }
 794         if (!qemu_opt_get(all_opts, "cache.no-flush")) {
 795             qemu_opt_set_bool(all_opts, "cache.no-flush",
 796                               !!(flags & BDRV_O_NO_FLUSH));
 797         }
 798         qemu_opt_unset(all_opts, "cache");
 799     }
 800
 801     return blockdev_init(all_opts, block_default_type);
 802 }
 803
 804 void do_commit(Monitor *mon, const QDict *qdict)
 805 {
 806     const char *device = qdict_get_str(qdict, "device");
 807     BlockDriverState *bs;
 808     int ret;
 809
 810     if (!strcmp(device, "all")) {
 811         ret = bdrv_commit_all();
 812     } else {
 813         bs = bdrv_find(device);
 814         if (!bs) {
 815             monitor_printf(mon, "Device '%s' not found\n", device);
 816             return;
 817         }
 818         ret = bdrv_commit(bs);
 819     }
 820     if (ret < 0) {
 821         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 822                        strerror(-ret));
 823     }
 824 }
 825
 826 static void blockdev_do_action(int kind, void *data, Error **errp)
 827 {
 828     TransactionAction action;
 829     TransactionActionList list;
 830
 831     action.kind = kind;
 832     action.data = data;
 833     list.value = &action;
 834     list.next = NULL;
 835     qmp_transaction(&list, errp);
 836 }
 837
 838 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 839                                 bool has_format, const char *format,
 840                                 bool has_mode, enum NewImageMode mode,
 841                                 Error **errp)
 842 {
 843     BlockdevSnapshot snapshot = {
 844         .device = (char *) device,
 845         .snapshot_file = (char *) snapshot_file,
 846         .has_format = has_format,
 847         .format = (char *) format,
 848         .has_mode = has_mode,
 849         .mode = mode,
 850     };
 851     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
 852                        &snapshot, errp);
 853 }
 854
 855 void qmp_blockdev_snapshot_internal_sync(const char *device,
 856                                          const char *name,
 857                                          Error **errp)
 858 {
 859     BlockdevSnapshotInternal snapshot = {
 860         .device = (char *) device,
 861         .name = (char *) name
 862     };
 863
 864     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
 865                        &snapshot, errp);
 866 }
 867
 868 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
 869                                                          bool has_id,
 870                                                          const char *id,
 871                                                          bool has_name,
 872                                                          const char *name,
 873                                                          Error **errp)
 874 {
 875     BlockDriverState *bs = bdrv_find(device);
 876     QEMUSnapshotInfo sn;
 877     Error *local_err = NULL;
 878     SnapshotInfo *info = NULL;
 879     int ret;
 880
 881     if (!bs) {
 882         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 883         return NULL;
 884     }
 885
 886     if (!has_id) {
 887         id = NULL;
 888     }
 889
 890     if (!has_name) {
 891         name = NULL;
 892     }
 893
 894     if (!id && !name) {
 895         error_setg(errp, "Name or id must be provided");
 896         return NULL;
 897     }
 898
 899     ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
 900     if (error_is_set(&local_err)) {
 901         error_propagate(errp, local_err);
 902         return NULL;
 903     }
 904     if (!ret) {
 905         error_setg(errp,
 906                    "Snapshot with id '%s' and name '%s' does not exist on "
 907                    "device '%s'",
 908                    STR_OR_NULL(id), STR_OR_NULL(name), device);
 909         return NULL;
 910     }
 911
 912     bdrv_snapshot_delete(bs, id, name, &local_err);
 913     if (error_is_set(&local_err)) {
 914         error_propagate(errp, local_err);
 915         return NULL;
 916     }
 917
 918     info = g_malloc0(sizeof(SnapshotInfo));
 919     info->id = g_strdup(sn.id_str);
 920     info->name = g_strdup(sn.name);
 921     info->date_nsec = sn.date_nsec;
 922     info->date_sec = sn.date_sec;
 923     info->vm_state_size = sn.vm_state_size;
 924     info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
 925     info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
 926
 927     return info;
 928 }
 929
 930 /* New and old BlockDriverState structs for group snapshots */
 931
 932 typedef struct BlkTransactionState BlkTransactionState;
 933
 934 /* Only prepare() may fail. In a single transaction, only one of commit() or
 935    abort() will be called, clean() will always be called if it present. */
 936 typedef struct BdrvActionOps {
 937     /* Size of state struct, in bytes. */
 938     size_t instance_size;
 939     /* Prepare the work, must NOT be NULL. */
 940     void (*prepare)(BlkTransactionState *common, Error **errp);
 941     /* Commit the changes, can be NULL. */
 942     void (*commit)(BlkTransactionState *common);
 943     /* Abort the changes on fail, can be NULL. */
 944     void (*abort)(BlkTransactionState *common);
 945     /* Clean up resource in the end, can be NULL. */
 946     void (*clean)(BlkTransactionState *common);
 947 } BdrvActionOps;
 948
 949 /*
 950  * This structure must be arranged as first member in child type, assuming
 951  * that compiler will also arrange it to the same address with parent instance.
 952  * Later it will be used in free().
 953  */
 954 struct BlkTransactionState {
 955     TransactionAction *action;
 956     const BdrvActionOps *ops;
 957     QSIMPLEQ_ENTRY(BlkTransactionState) entry;
 958 };
 959
 960 /* internal snapshot private data */
 961 typedef struct InternalSnapshotState {
 962     BlkTransactionState common;
 963     BlockDriverState *bs;
 964     QEMUSnapshotInfo sn;
 965 } InternalSnapshotState;
 966
 967 static void internal_snapshot_prepare(BlkTransactionState *common,
 968                                       Error **errp)
 969 {
 970     const char *device;
 971     const char *name;
 972     BlockDriverState *bs;
 973     QEMUSnapshotInfo old_sn, *sn;
 974     bool ret;
 975     qemu_timeval tv;
 976     BlockdevSnapshotInternal *internal;
 977     InternalSnapshotState *state;
 978     int ret1;
 979
 980     g_assert(common->action->kind ==
 981              TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
 982     internal = common->action->blockdev_snapshot_internal_sync;
 983     state = DO_UPCAST(InternalSnapshotState, common, common);
 984
 985     /* 1. parse input */
 986     device = internal->device;
 987     name = internal->name;
 988
 989     /* 2. check for validation */
 990     bs = bdrv_find(device);
 991     if (!bs) {
 992         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 993         return;
 994     }
 995
 996     if (!bdrv_is_inserted(bs)) {
 997         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 998         return;
 999     }
1000
1001     if (bdrv_is_read_only(bs)) {
1002         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1003         return;
1004     }
1005
1006     if (!bdrv_can_snapshot(bs)) {
1007         error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1008                   bs->drv->format_name, device, "internal snapshot");
1009         return;
1010     }
1011
1012     if (!strlen(name)) {
1013         error_setg(errp, "Name is empty");
1014         return;
1015     }
1016
1017     /* check whether a snapshot with name exist */
1018     ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1019     if (error_is_set(errp)) {
1020         return;
1021     } else if (ret) {
1022         error_setg(errp,
1023                    "Snapshot with name '%s' already exists on device '%s'",
1024                    name, device);
1025         return;
1026     }
1027
1028     /* 3. take the snapshot */
1029     sn = &state->sn;
1030     pstrcpy(sn->name, sizeof(sn->name), name);
1031     qemu_gettimeofday(&tv);
1032     sn->date_sec = tv.tv_sec;
1033     sn->date_nsec = tv.tv_usec * 1000;
1034     sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1035
1036     ret1 = bdrv_snapshot_create(bs, sn);
1037     if (ret1 < 0) {
1038         error_setg_errno(errp, -ret1,
1039                          "Failed to create snapshot '%s' on device '%s'",
1040                          name, device);
1041         return;
1042     }
1043
1044     /* 4. succeed, mark a snapshot is created */
1045     state->bs = bs;
1046 }
1047
1048 static void internal_snapshot_abort(BlkTransactionState *common)
1049 {
1050     InternalSnapshotState *state =
1051                              DO_UPCAST(InternalSnapshotState, common, common);
1052     BlockDriverState *bs = state->bs;
1053     QEMUSnapshotInfo *sn = &state->sn;
1054     Error *local_error = NULL;
1055
1056     if (!bs) {
1057         return;
1058     }
1059
1060     if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1061         error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1062                      "device '%s' in abort: %s",
1063                      sn->id_str,
1064                      sn->name,
1065                      bdrv_get_device_name(bs),
1066                      error_get_pretty(local_error));
1067         error_free(local_error);
1068     }
1069 }
1070
1071 /* external snapshot private data */
1072 typedef struct ExternalSnapshotState {
1073     BlkTransactionState common;
1074     BlockDriverState *old_bs;
1075     BlockDriverState *new_bs;
1076 } ExternalSnapshotState;
1077
1078 static void external_snapshot_prepare(BlkTransactionState *common,
1079                                       Error **errp)
1080 {
1081     BlockDriver *drv;
1082     int flags, ret;
1083     Error *local_err = NULL;
1084     const char *device;
1085     const char *new_image_file;
1086     const char *format = "qcow2";
1087     enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1088     ExternalSnapshotState *state =
1089                              DO_UPCAST(ExternalSnapshotState, common, common);
1090     TransactionAction *action = common->action;
1091
1092     /* get parameters */
1093     g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1094
1095     device = action->blockdev_snapshot_sync->device;
1096     new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1097     if (action->blockdev_snapshot_sync->has_format) {
1098         format = action->blockdev_snapshot_sync->format;
1099     }
1100     if (action->blockdev_snapshot_sync->has_mode) {
1101         mode = action->blockdev_snapshot_sync->mode;
1102     }
1103
1104     /* start processing */
1105     drv = bdrv_find_format(format);
1106     if (!drv) {
1107         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1108         return;
1109     }
1110
1111     state->old_bs = bdrv_find(device);
1112     if (!state->old_bs) {
1113         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1114         return;
1115     }
1116
1117     if (!bdrv_is_inserted(state->old_bs)) {
1118         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1119         return;
1120     }
1121
1122     if (bdrv_in_use(state->old_bs)) {
1123         error_set(errp, QERR_DEVICE_IN_USE, device);
1124         return;
1125     }
1126
1127     if (!bdrv_is_read_only(state->old_bs)) {
1128         if (bdrv_flush(state->old_bs)) {
1129             error_set(errp, QERR_IO_ERROR);
1130             return;
1131         }
1132     }
1133
1134     flags = state->old_bs->open_flags;
1135
1136     /* create new image w/backing file */
1137     if (mode != NEW_IMAGE_MODE_EXISTING) {
1138         bdrv_img_create(new_image_file, format,
1139                         state->old_bs->filename,
1140                         state->old_bs->drv->format_name,
1141                         NULL, -1, flags, &local_err, false);
1142         if (error_is_set(&local_err)) {
1143             error_propagate(errp, local_err);
1144             return;
1145         }
1146     }
1147
1148     /* We will manually add the backing_hd field to the bs later */
1149     state->new_bs = bdrv_new("");
1150     /* TODO Inherit bs->options or only take explicit options with an
1151      * extended QMP command? */
1152     ret = bdrv_open(state->new_bs, new_image_file, NULL,
1153                     flags | BDRV_O_NO_BACKING, drv, &local_err);
1154     if (ret != 0) {
1155         error_propagate(errp, local_err);
1156     }
1157 }
1158
1159 static void external_snapshot_commit(BlkTransactionState *common)
1160 {
1161     ExternalSnapshotState *state =
1162                              DO_UPCAST(ExternalSnapshotState, common, common);
1163
1164     /* This removes our old bs and adds the new bs */
1165     bdrv_append(state->new_bs, state->old_bs);
1166     /* We don't need (or want) to use the transactional
1167      * bdrv_reopen_multiple() across all the entries at once, because we
1168      * don't want to abort all of them if one of them fails the reopen */
1169     bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1170                 NULL);
1171 }
1172
1173 static void external_snapshot_abort(BlkTransactionState *common)
1174 {
1175     ExternalSnapshotState *state =
1176                              DO_UPCAST(ExternalSnapshotState, common, common);
1177     if (state->new_bs) {
1178         bdrv_unref(state->new_bs);
1179     }
1180 }
1181
1182 typedef struct DriveBackupState {
1183     BlkTransactionState common;
1184     BlockDriverState *bs;
1185     BlockJob *job;
1186 } DriveBackupState;
1187
1188 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1189 {
1190     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1191     DriveBackup *backup;
1192     Error *local_err = NULL;
1193
1194     assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1195     backup = common->action->drive_backup;
1196
1197     qmp_drive_backup(backup->device, backup->target,
1198                      backup->has_format, backup->format,
1199                      backup->sync,
1200                      backup->has_mode, backup->mode,
1201                      backup->has_speed, backup->speed,
1202                      backup->has_on_source_error, backup->on_source_error,
1203                      backup->has_on_target_error, backup->on_target_error,
1204                      &local_err);
1205     if (error_is_set(&local_err)) {
1206         error_propagate(errp, local_err);
1207         state->bs = NULL;
1208         state->job = NULL;
1209         return;
1210     }
1211
1212     state->bs = bdrv_find(backup->device);
1213     state->job = state->bs->job;
1214 }
1215
1216 static void drive_backup_abort(BlkTransactionState *common)
1217 {
1218     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1219     BlockDriverState *bs = state->bs;
1220
1221     /* Only cancel if it's the job we started */
1222     if (bs && bs->job && bs->job == state->job) {
1223         block_job_cancel_sync(bs->job);
1224     }
1225 }
1226
1227 static void abort_prepare(BlkTransactionState *common, Error **errp)
1228 {
1229     error_setg(errp, "Transaction aborted using Abort action");
1230 }
1231
1232 static void abort_commit(BlkTransactionState *common)
1233 {
1234     g_assert_not_reached(); /* this action never succeeds */
1235 }
1236
1237 static const BdrvActionOps actions[] = {
1238     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1239         .instance_size = sizeof(ExternalSnapshotState),
1240         .prepare  = external_snapshot_prepare,
1241         .commit   = external_snapshot_commit,
1242         .abort = external_snapshot_abort,
1243     },
1244     [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1245         .instance_size = sizeof(DriveBackupState),
1246         .prepare = drive_backup_prepare,
1247         .abort = drive_backup_abort,
1248     },
1249     [TRANSACTION_ACTION_KIND_ABORT] = {
1250         .instance_size = sizeof(BlkTransactionState),
1251         .prepare = abort_prepare,
1252         .commit = abort_commit,
1253     },
1254     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1255         .instance_size = sizeof(InternalSnapshotState),
1256         .prepare  = internal_snapshot_prepare,
1257         .abort = internal_snapshot_abort,
1258     },
1259 };
1260
1261 /*
1262  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
1263  *  then we do not pivot any of the devices in the group, and abandon the
1264  *  snapshots
1265  */
1266 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1267 {
1268     TransactionActionList *dev_entry = dev_list;
1269     BlkTransactionState *state, *next;
1270     Error *local_err = NULL;
1271
1272     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1273     QSIMPLEQ_INIT(&snap_bdrv_states);
1274
1275     /* drain all i/o before any snapshots */
1276     bdrv_drain_all();
1277
1278     /* We don't do anything in this loop that commits us to the snapshot */
1279     while (NULL != dev_entry) {
1280         TransactionAction *dev_info = NULL;
1281         const BdrvActionOps *ops;
1282
1283         dev_info = dev_entry->value;
1284         dev_entry = dev_entry->next;
1285
1286         assert(dev_info->kind < ARRAY_SIZE(actions));
1287
1288         ops = &actions[dev_info->kind];
1289         assert(ops->instance_size > 0);
1290
1291         state = g_malloc0(ops->instance_size);
1292         state->ops = ops;
1293         state->action = dev_info;
1294         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1295
1296         state->ops->prepare(state, &local_err);
1297         if (error_is_set(&local_err)) {
1298             error_propagate(errp, local_err);
1299             goto delete_and_fail;
1300         }
1301     }
1302
1303     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1304         if (state->ops->commit) {
1305             state->ops->commit(state);
1306         }
1307     }
1308
1309     /* success */
1310     goto exit;
1311
1312 delete_and_fail:
1313     /*
1314     * failure, and it is all-or-none; abandon each new bs, and keep using
1315     * the original bs for all images
1316     */
1317     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1318         if (state->ops->abort) {
1319             state->ops->abort(state);
1320         }
1321     }
1322 exit:
1323     QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1324         if (state->ops->clean) {
1325             state->ops->clean(state);
1326         }
1327         g_free(state);
1328     }
1329 }
1330
1331
1332 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1333 {
1334     if (bdrv_in_use(bs)) {
1335         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1336         return;
1337     }
1338     if (!bdrv_dev_has_removable_media(bs)) {
1339         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1340         return;
1341     }
1342
1343     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1344         bdrv_dev_eject_request(bs, force);
1345         if (!force) {
1346             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1347             return;
1348         }
1349     }
1350
1351     bdrv_close(bs);
1352 }
1353
1354 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1355 {
1356     BlockDriverState *bs;
1357
1358     bs = bdrv_find(device);
1359     if (!bs) {
1360         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1361         return;
1362     }
1363
1364     eject_device(bs, force, errp);
1365 }
1366
1367 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1368 {
1369     BlockDriverState *bs;
1370     int err;
1371
1372     bs = bdrv_find(device);
1373     if (!bs) {
1374         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1375         return;
1376     }
1377
1378     err = bdrv_set_key(bs, password);
1379     if (err == -EINVAL) {
1380         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1381         return;
1382     } else if (err < 0) {
1383         error_set(errp, QERR_INVALID_PASSWORD);
1384         return;
1385     }
1386 }
1387
1388 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1389                                     int bdrv_flags, BlockDriver *drv,
1390                                     const char *password, Error **errp)
1391 {
1392     Error *local_err = NULL;
1393     int ret;
1394
1395     ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1396     if (ret < 0) {
1397         error_propagate(errp, local_err);
1398         return;
1399     }
1400
1401     if (bdrv_key_required(bs)) {
1402         if (password) {
1403             if (bdrv_set_key(bs, password) < 0) {
1404                 error_set(errp, QERR_INVALID_PASSWORD);
1405             }
1406         } else {
1407             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1408                       bdrv_get_encrypted_filename(bs));
1409         }
1410     } else if (password) {
1411         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1412     }
1413 }
1414
1415 void qmp_change_blockdev(const char *device, const char *filename,
1416                          bool has_format, const char *format, Error **errp)
1417 {
1418     BlockDriverState *bs;
1419     BlockDriver *drv = NULL;
1420     int bdrv_flags;
1421     Error *err = NULL;
1422
1423     bs = bdrv_find(device);
1424     if (!bs) {
1425         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1426         return;
1427     }
1428
1429     if (format) {
1430         drv = bdrv_find_whitelisted_format(format, bs->read_only);
1431         if (!drv) {
1432             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1433             return;
1434         }
1435     }
1436
1437     eject_device(bs, 0, &err);
1438     if (error_is_set(&err)) {
1439         error_propagate(errp, err);
1440         return;
1441     }
1442
1443     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1444     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1445
1446     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1447 }
1448
1449 /* throttling disk I/O limits */
1450 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1451                                int64_t bps_wr,
1452                                int64_t iops,
1453                                int64_t iops_rd,
1454                                int64_t iops_wr,
1455                                bool has_bps_max,
1456                                int64_t bps_max,
1457                                bool has_bps_rd_max,
1458                                int64_t bps_rd_max,
1459                                bool has_bps_wr_max,
1460                                int64_t bps_wr_max,
1461                                bool has_iops_max,
1462                                int64_t iops_max,
1463                                bool has_iops_rd_max,
1464                                int64_t iops_rd_max,
1465                                bool has_iops_wr_max,
1466                                int64_t iops_wr_max,
1467                                bool has_iops_size,
1468                                int64_t iops_size, Error **errp)
1469 {
1470     ThrottleConfig cfg;
1471     BlockDriverState *bs;
1472
1473     bs = bdrv_find(device);
1474     if (!bs) {
1475         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1476         return;
1477     }
1478
1479     memset(&cfg, 0, sizeof(cfg));
1480     cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1481     cfg.buckets[THROTTLE_BPS_READ].avg  = bps_rd;
1482     cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1483
1484     cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1485     cfg.buckets[THROTTLE_OPS_READ].avg  = iops_rd;
1486     cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1487
1488     if (has_bps_max) {
1489         cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1490     }
1491     if (has_bps_rd_max) {
1492         cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1493     }
1494     if (has_bps_wr_max) {
1495         cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1496     }
1497     if (has_iops_max) {
1498         cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1499     }
1500     if (has_iops_rd_max) {
1501         cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1502     }
1503     if (has_iops_wr_max) {
1504         cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1505     }
1506
1507     if (has_iops_size) {
1508         cfg.op_size = iops_size;
1509     }
1510
1511     if (!check_throttle_config(&cfg, errp)) {
1512         return;
1513     }
1514
1515     if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1516         bdrv_io_limits_enable(bs);
1517     } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1518         bdrv_io_limits_disable(bs);
1519     }
1520
1521     if (bs->io_limits_enabled) {
1522         bdrv_set_io_limits(bs, &cfg);
1523     }
1524 }
1525
1526 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1527 {
1528     const char *id = qdict_get_str(qdict, "id");
1529     BlockDriverState *bs;
1530
1531     bs = bdrv_find(id);
1532     if (!bs) {
1533         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1534         return -1;
1535     }
1536     if (bdrv_in_use(bs)) {
1537         qerror_report(QERR_DEVICE_IN_USE, id);
1538         return -1;
1539     }
1540
1541     /* quiesce block driver; prevent further io */
1542     bdrv_drain_all();
1543     bdrv_flush(bs);
1544     bdrv_close(bs);
1545
1546     /* if we have a device attached to this BlockDriverState
1547      * then we need to make the drive anonymous until the device
1548      * can be removed.  If this is a drive with no device backing
1549      * then we can just get rid of the block driver state right here.
1550      */
1551     if (bdrv_get_attached_dev(bs)) {
1552         bdrv_make_anon(bs);
1553
1554         /* Further I/O must not pause the guest */
1555         bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1556                           BLOCKDEV_ON_ERROR_REPORT);
1557     } else {
1558         drive_uninit(drive_get_by_blockdev(bs));
1559     }
1560
1561     return 0;
1562 }
1563
1564 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1565 {
1566     BlockDriverState *bs;
1567     int ret;
1568
1569     bs = bdrv_find(device);
1570     if (!bs) {
1571         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1572         return;
1573     }
1574
1575     if (size < 0) {
1576         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1577         return;
1578     }
1579
1580     /* complete all in-flight operations before resizing the device */
1581     bdrv_drain_all();
1582
1583     ret = bdrv_truncate(bs, size);
1584     switch (ret) {
1585     case 0:
1586         break;
1587     case -ENOMEDIUM:
1588         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1589         break;
1590     case -ENOTSUP:
1591         error_set(errp, QERR_UNSUPPORTED);
1592         break;
1593     case -EACCES:
1594         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1595         break;
1596     case -EBUSY:
1597         error_set(errp, QERR_DEVICE_IN_USE, device);
1598         break;
1599     default:
1600         error_setg_errno(errp, -ret, "Could not resize");
1601         break;
1602     }
1603 }
1604
1605 static void block_job_cb(void *opaque, int ret)
1606 {
1607     BlockDriverState *bs = opaque;
1608     QObject *obj;
1609
1610     trace_block_job_cb(bs, bs->job, ret);
1611
1612     assert(bs->job);
1613     obj = qobject_from_block_job(bs->job);
1614     if (ret < 0) {
1615         QDict *dict = qobject_to_qdict(obj);
1616         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1617     }
1618
1619     if (block_job_is_cancelled(bs->job)) {
1620         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1621     } else {
1622         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1623     }
1624     qobject_decref(obj);
1625
1626     bdrv_put_ref_bh_schedule(bs);
1627 }
1628
1629 void qmp_block_stream(const char *device, bool has_base,
1630                       const char *base, bool has_speed, int64_t speed,
1631                       bool has_on_error, BlockdevOnError on_error,
1632                       Error **errp)
1633 {
1634     BlockDriverState *bs;
1635     BlockDriverState *base_bs = NULL;
1636     Error *local_err = NULL;
1637
1638     if (!has_on_error) {
1639         on_error = BLOCKDEV_ON_ERROR_REPORT;
1640     }
1641
1642     bs = bdrv_find(device);
1643     if (!bs) {
1644         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1645         return;
1646     }
1647
1648     if (base) {
1649         base_bs = bdrv_find_backing_image(bs, base);
1650         if (base_bs == NULL) {
1651             error_set(errp, QERR_BASE_NOT_FOUND, base);
1652             return;
1653         }
1654     }
1655
1656     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1657                  on_error, block_job_cb, bs, &local_err);
1658     if (error_is_set(&local_err)) {
1659         error_propagate(errp, local_err);
1660         return;
1661     }
1662
1663     trace_qmp_block_stream(bs, bs->job);
1664 }
1665
1666 void qmp_block_commit(const char *device,
1667                       bool has_base, const char *base, const char *top,
1668                       bool has_speed, int64_t speed,
1669                       Error **errp)
1670 {
1671     BlockDriverState *bs;
1672     BlockDriverState *base_bs, *top_bs;
1673     Error *local_err = NULL;
1674     /* This will be part of the QMP command, if/when the
1675      * BlockdevOnError change for blkmirror makes it in
1676      */
1677     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1678
1679     /* drain all i/o before commits */
1680     bdrv_drain_all();
1681
1682     bs = bdrv_find(device);
1683     if (!bs) {
1684         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1685         return;
1686     }
1687
1688     /* default top_bs is the active layer */
1689     top_bs = bs;
1690
1691     if (top) {
1692         if (strcmp(bs->filename, top) != 0) {
1693             top_bs = bdrv_find_backing_image(bs, top);
1694         }
1695     }
1696
1697     if (top_bs == NULL) {
1698         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1699         return;
1700     }
1701
1702     if (has_base && base) {
1703         base_bs = bdrv_find_backing_image(top_bs, base);
1704     } else {
1705         base_bs = bdrv_find_base(top_bs);
1706     }
1707
1708     if (base_bs == NULL) {
1709         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1710         return;
1711     }
1712
1713     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1714                 &local_err);
1715     if (local_err != NULL) {
1716         error_propagate(errp, local_err);
1717         return;
1718     }
1719 }
1720
1721 void qmp_drive_backup(const char *device, const char *target,
1722                       bool has_format, const char *format,
1723                       enum MirrorSyncMode sync,
1724                       bool has_mode, enum NewImageMode mode,
1725                       bool has_speed, int64_t speed,
1726                       bool has_on_source_error, BlockdevOnError on_source_error,
1727                       bool has_on_target_error, BlockdevOnError on_target_error,
1728                       Error **errp)
1729 {
1730     BlockDriverState *bs;
1731     BlockDriverState *target_bs;
1732     BlockDriverState *source = NULL;
1733     BlockDriver *drv = NULL;
1734     Error *local_err = NULL;
1735     int flags;
1736     int64_t size;
1737     int ret;
1738
1739     if (!has_speed) {
1740         speed = 0;
1741     }
1742     if (!has_on_source_error) {
1743         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1744     }
1745     if (!has_on_target_error) {
1746         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1747     }
1748     if (!has_mode) {
1749         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1750     }
1751
1752     bs = bdrv_find(device);
1753     if (!bs) {
1754         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1755         return;
1756     }
1757
1758     if (!bdrv_is_inserted(bs)) {
1759         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1760         return;
1761     }
1762
1763     if (!has_format) {
1764         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1765     }
1766     if (format) {
1767         drv = bdrv_find_format(format);
1768         if (!drv) {
1769             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1770             return;
1771         }
1772     }
1773
1774     if (bdrv_in_use(bs)) {
1775         error_set(errp, QERR_DEVICE_IN_USE, device);
1776         return;
1777     }
1778
1779     flags = bs->open_flags | BDRV_O_RDWR;
1780
1781     /* See if we have a backing HD we can use to create our new image
1782      * on top of. */
1783     if (sync == MIRROR_SYNC_MODE_TOP) {
1784         source = bs->backing_hd;
1785         if (!source) {
1786             sync = MIRROR_SYNC_MODE_FULL;
1787         }
1788     }
1789     if (sync == MIRROR_SYNC_MODE_NONE) {
1790         source = bs;
1791     }
1792
1793     size = bdrv_getlength(bs);
1794     if (size < 0) {
1795         error_setg_errno(errp, -size, "bdrv_getlength failed");
1796         return;
1797     }
1798
1799     if (mode != NEW_IMAGE_MODE_EXISTING) {
1800         assert(format && drv);
1801         if (source) {
1802             bdrv_img_create(target, format, source->filename,
1803                             source->drv->format_name, NULL,
1804                             size, flags, &local_err, false);
1805         } else {
1806             bdrv_img_create(target, format, NULL, NULL, NULL,
1807                             size, flags, &local_err, false);
1808         }
1809     }
1810
1811     if (error_is_set(&local_err)) {
1812         error_propagate(errp, local_err);
1813         return;
1814     }
1815
1816     target_bs = bdrv_new("");
1817     ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1818     if (ret < 0) {
1819         bdrv_unref(target_bs);
1820         error_propagate(errp, local_err);
1821         return;
1822     }
1823
1824     backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1825                  block_job_cb, bs, &local_err);
1826     if (local_err != NULL) {
1827         bdrv_unref(target_bs);
1828         error_propagate(errp, local_err);
1829         return;
1830     }
1831 }
1832
1833 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1834
1835 void qmp_drive_mirror(const char *device, const char *target,
1836                       bool has_format, const char *format,
1837                       enum MirrorSyncMode sync,
1838                       bool has_mode, enum NewImageMode mode,
1839                       bool has_speed, int64_t speed,
1840                       bool has_granularity, uint32_t granularity,
1841                       bool has_buf_size, int64_t buf_size,
1842                       bool has_on_source_error, BlockdevOnError on_source_error,
1843                       bool has_on_target_error, BlockdevOnError on_target_error,
1844                       Error **errp)
1845 {
1846     BlockDriverState *bs;
1847     BlockDriverState *source, *target_bs;
1848     BlockDriver *drv = NULL;
1849     Error *local_err = NULL;
1850     int flags;
1851     int64_t size;
1852     int ret;
1853
1854     if (!has_speed) {
1855         speed = 0;
1856     }
1857     if (!has_on_source_error) {
1858         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1859     }
1860     if (!has_on_target_error) {
1861         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1862     }
1863     if (!has_mode) {
1864         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1865     }
1866     if (!has_granularity) {
1867         granularity = 0;
1868     }
1869     if (!has_buf_size) {
1870         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1871     }
1872
1873     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1874         error_set(errp, QERR_INVALID_PARAMETER, device);
1875         return;
1876     }
1877     if (granularity & (granularity - 1)) {
1878         error_set(errp, QERR_INVALID_PARAMETER, device);
1879         return;
1880     }
1881
1882     bs = bdrv_find(device);
1883     if (!bs) {
1884         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1885         return;
1886     }
1887
1888     if (!bdrv_is_inserted(bs)) {
1889         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1890         return;
1891     }
1892
1893     if (!has_format) {
1894         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1895     }
1896     if (format) {
1897         drv = bdrv_find_format(format);
1898         if (!drv) {
1899             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1900             return;
1901         }
1902     }
1903
1904     if (bdrv_in_use(bs)) {
1905         error_set(errp, QERR_DEVICE_IN_USE, device);
1906         return;
1907     }
1908
1909     flags = bs->open_flags | BDRV_O_RDWR;
1910     source = bs->backing_hd;
1911     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1912         sync = MIRROR_SYNC_MODE_FULL;
1913     }
1914
1915     size = bdrv_getlength(bs);
1916     if (size < 0) {
1917         error_setg_errno(errp, -size, "bdrv_getlength failed");
1918         return;
1919     }
1920
1921     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1922         /* create new image w/o backing file */
1923         assert(format && drv);
1924         bdrv_img_create(target, format,
1925                         NULL, NULL, NULL, size, flags, &local_err, false);
1926     } else {
1927         switch (mode) {
1928         case NEW_IMAGE_MODE_EXISTING:
1929             break;
1930         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1931             /* create new image with backing file */
1932             bdrv_img_create(target, format,
1933                             source->filename,
1934                             source->drv->format_name,
1935                             NULL, size, flags, &local_err, false);
1936             break;
1937         default:
1938             abort();
1939         }
1940     }
1941
1942     if (error_is_set(&local_err)) {
1943         error_propagate(errp, local_err);
1944         return;
1945     }
1946
1947     /* Mirroring takes care of copy-on-write using the source's backing
1948      * file.
1949      */
1950     target_bs = bdrv_new("");
1951     ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
1952                     &local_err);
1953     if (ret < 0) {
1954         bdrv_unref(target_bs);
1955         error_propagate(errp, local_err);
1956         return;
1957     }
1958
1959     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1960                  on_source_error, on_target_error,
1961                  block_job_cb, bs, &local_err);
1962     if (local_err != NULL) {
1963         bdrv_unref(target_bs);
1964         error_propagate(errp, local_err);
1965         return;
1966     }
1967 }
1968
1969 static BlockJob *find_block_job(const char *device)
1970 {
1971     BlockDriverState *bs;
1972
1973     bs = bdrv_find(device);
1974     if (!bs || !bs->job) {
1975         return NULL;
1976     }
1977     return bs->job;
1978 }
1979
1980 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1981 {
1982     BlockJob *job = find_block_job(device);
1983
1984     if (!job) {
1985         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1986         return;
1987     }
1988
1989     block_job_set_speed(job, speed, errp);
1990 }
1991
1992 void qmp_block_job_cancel(const char *device,
1993                           bool has_force, bool force, Error **errp)
1994 {
1995     BlockJob *job = find_block_job(device);
1996
1997     if (!has_force) {
1998         force = false;
1999     }
2000
2001     if (!job) {
2002         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2003         return;
2004     }
2005     if (job->paused && !force) {
2006         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2007         return;
2008     }
2009
2010     trace_qmp_block_job_cancel(job);
2011     block_job_cancel(job);
2012 }
2013
2014 void qmp_block_job_pause(const char *device, Error **errp)
2015 {
2016     BlockJob *job = find_block_job(device);
2017
2018     if (!job) {
2019         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2020         return;
2021     }
2022
2023     trace_qmp_block_job_pause(job);
2024     block_job_pause(job);
2025 }
2026
2027 void qmp_block_job_resume(const char *device, Error **errp)
2028 {
2029     BlockJob *job = find_block_job(device);
2030
2031     if (!job) {
2032         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2033         return;
2034     }
2035
2036     trace_qmp_block_job_resume(job);
2037     block_job_resume(job);
2038 }
2039
2040 void qmp_block_job_complete(const char *device, Error **errp)
2041 {
2042     BlockJob *job = find_block_job(device);
2043
2044     if (!job) {
2045         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2046         return;
2047     }
2048
2049     trace_qmp_block_job_complete(job);
2050     block_job_complete(job, errp);
2051 }
2052
2053 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2054 {
2055     BlockJobInfoList **prev = opaque;
2056     BlockJob *job = bs->job;
2057
2058     if (job) {
2059         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2060         elem->value = block_job_query(bs->job);
2061         (*prev)->next = elem;
2062         *prev = elem;
2063     }
2064 }
2065
2066 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2067 {
2068     /* Dummy is a fake list element for holding the head pointer */
2069     BlockJobInfoList dummy = {};
2070     BlockJobInfoList *prev = &dummy;
2071     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2072     return dummy.next;
2073 }
2074
2075 QemuOptsList qemu_common_drive_opts = {
2076     .name = "drive",
2077     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2078     .desc = {
2079         {
2080             .name = "bus",
2081             .type = QEMU_OPT_NUMBER,
2082             .help = "bus number",
2083         },{
2084             .name = "unit",
2085             .type = QEMU_OPT_NUMBER,
2086             .help = "unit number (i.e. lun for scsi)",
2087         },{
2088             .name = "if",
2089             .type = QEMU_OPT_STRING,
2090             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
2091         },{
2092             .name = "index",
2093             .type = QEMU_OPT_NUMBER,
2094             .help = "index number",
2095         },{
2096             .name = "cyls",
2097             .type = QEMU_OPT_NUMBER,
2098             .help = "number of cylinders (ide disk geometry)",
2099         },{
2100             .name = "heads",
2101             .type = QEMU_OPT_NUMBER,
2102             .help = "number of heads (ide disk geometry)",
2103         },{
2104             .name = "secs",
2105             .type = QEMU_OPT_NUMBER,
2106             .help = "number of sectors (ide disk geometry)",
2107         },{
2108             .name = "trans",
2109             .type = QEMU_OPT_STRING,
2110             .help = "chs translation (auto, lba. none)",
2111         },{
2112             .name = "media",
2113             .type = QEMU_OPT_STRING,
2114             .help = "media type (disk, cdrom)",
2115         },{
2116             .name = "snapshot",
2117             .type = QEMU_OPT_BOOL,
2118             .help = "enable/disable snapshot mode",
2119         },{
2120             .name = "file",
2121             .type = QEMU_OPT_STRING,
2122             .help = "disk image",
2123         },{
2124             .name = "discard",
2125             .type = QEMU_OPT_STRING,
2126             .help = "discard operation (ignore/off, unmap/on)",
2127         },{
2128             .name = "cache.writeback",
2129             .type = QEMU_OPT_BOOL,
2130             .help = "enables writeback mode for any caches",
2131         },{
2132             .name = "cache.direct",
2133             .type = QEMU_OPT_BOOL,
2134             .help = "enables use of O_DIRECT (bypass the host page cache)",
2135         },{
2136             .name = "cache.no-flush",
2137             .type = QEMU_OPT_BOOL,
2138             .help = "ignore any flush requests for the device",
2139         },{
2140             .name = "aio",
2141             .type = QEMU_OPT_STRING,
2142             .help = "host AIO implementation (threads, native)",
2143         },{
2144             .name = "format",
2145             .type = QEMU_OPT_STRING,
2146             .help = "disk format (raw, qcow2, ...)",
2147         },{
2148             .name = "serial",
2149             .type = QEMU_OPT_STRING,
2150             .help = "disk serial number",
2151         },{
2152             .name = "rerror",
2153             .type = QEMU_OPT_STRING,
2154             .help = "read error action",
2155         },{
2156             .name = "werror",
2157             .type = QEMU_OPT_STRING,
2158             .help = "write error action",
2159         },{
2160             .name = "addr",
2161             .type = QEMU_OPT_STRING,
2162             .help = "pci address (virtio only)",
2163         },{
2164             .name = "read-only",
2165             .type = QEMU_OPT_BOOL,
2166             .help = "open drive file as read-only",
2167         },{
2168             .name = "throttling.iops-total",
2169             .type = QEMU_OPT_NUMBER,
2170             .help = "limit total I/O operations per second",
2171         },{
2172             .name = "throttling.iops-read",
2173             .type = QEMU_OPT_NUMBER,
2174             .help = "limit read operations per second",
2175         },{
2176             .name = "throttling.iops-write",
2177             .type = QEMU_OPT_NUMBER,
2178             .help = "limit write operations per second",
2179         },{
2180             .name = "throttling.bps-total",
2181             .type = QEMU_OPT_NUMBER,
2182             .help = "limit total bytes per second",
2183         },{
2184             .name = "throttling.bps-read",
2185             .type = QEMU_OPT_NUMBER,
2186             .help = "limit read bytes per second",
2187         },{
2188             .name = "throttling.bps-write",
2189             .type = QEMU_OPT_NUMBER,
2190             .help = "limit write bytes per second",
2191         },{
2192             .name = "throttling.iops-total-max",
2193             .type = QEMU_OPT_NUMBER,
2194             .help = "I/O operations burst",
2195         },{
2196             .name = "throttling.iops-read-max",
2197             .type = QEMU_OPT_NUMBER,
2198             .help = "I/O operations read burst",
2199         },{
2200             .name = "throttling.iops-write-max",
2201             .type = QEMU_OPT_NUMBER,
2202             .help = "I/O operations write burst",
2203         },{
2204             .name = "throttling.bps-total-max",
2205             .type = QEMU_OPT_NUMBER,
2206             .help = "total bytes burst",
2207         },{
2208             .name = "throttling.bps-read-max",
2209             .type = QEMU_OPT_NUMBER,
2210             .help = "total bytes read burst",
2211         },{
2212             .name = "throttling.bps-write-max",
2213             .type = QEMU_OPT_NUMBER,
2214             .help = "total bytes write burst",
2215         },{
2216             .name = "throttling.iops-size",
2217             .type = QEMU_OPT_NUMBER,
2218             .help = "when limiting by iops max size of an I/O in bytes",
2219         },{
2220             .name = "copy-on-read",
2221             .type = QEMU_OPT_BOOL,
2222             .help = "copy read data from backing file into image file",
2223         },{
2224             .name = "boot",
2225             .type = QEMU_OPT_BOOL,
2226             .help = "(deprecated, ignored)",
2227         },
2228         { /* end of list */ }
2229     },
2230 };
2231
2232 QemuOptsList qemu_drive_opts = {
2233     .name = "drive",
2234     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2235     .desc = {
2236         /*
2237          * no elements => accept any params
2238          * validation will happen later
2239          */
2240         { /* end of list */ }
2241     },
2242 };