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", true)) {
 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);
 714
 715     if (ret < 0) {
 716         if (ret == -EMEDIUMTYPE) {
 717             error_report("could not open disk image %s: not in %s format",
 718                          file ?: dinfo->id, drv ? drv->format_name :
 719                          qdict_get_str(bs_opts, "driver"));
 720         } else {
 721             error_report("could not open disk image %s: %s",
 722                          file ?: dinfo->id, strerror(-ret));
 723         }
 724         goto err;
 725     }
 726
 727     if (bdrv_key_required(dinfo->bdrv))
 728         autostart = 0;
 729
 730     QDECREF(bs_opts);
 731     qemu_opts_del(opts);
 732
 733     return dinfo;
 734
 735 err:
 736     qemu_opts_del(opts);
 737     QDECREF(bs_opts);
 738     bdrv_unref(dinfo->bdrv);
 739     g_free(dinfo->id);
 740     QTAILQ_REMOVE(&drives, dinfo, next);
 741     g_free(dinfo);
 742     return NULL;
 743 }
 744
 745 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
 746 {
 747     const char *value;
 748
 749     value = qemu_opt_get(opts, from);
 750     if (value) {
 751         qemu_opt_set(opts, to, value);
 752         qemu_opt_unset(opts, from);
 753     }
 754 }
 755
 756 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 757 {
 758     const char *value;
 759
 760     /* Change legacy command line options into QMP ones */
 761     qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
 762     qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
 763     qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
 764
 765     qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
 766     qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
 767     qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
 768
 769     qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
 770     qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
 771     qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
 772
 773     qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
 774     qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
 775     qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
 776
 777     qemu_opt_rename(all_opts,
 778                     "iops_size", "throttling.iops-size");
 779
 780     qemu_opt_rename(all_opts, "readonly", "read-only");
 781
 782     value = qemu_opt_get(all_opts, "cache");
 783     if (value) {
 784         int flags = 0;
 785
 786         if (bdrv_parse_cache_flags(value, &flags) != 0) {
 787             error_report("invalid cache option");
 788             return NULL;
 789         }
 790
 791         /* Specific options take precedence */
 792         if (!qemu_opt_get(all_opts, "cache.writeback")) {
 793             qemu_opt_set_bool(all_opts, "cache.writeback",
 794                               !!(flags & BDRV_O_CACHE_WB));
 795         }
 796         if (!qemu_opt_get(all_opts, "cache.direct")) {
 797             qemu_opt_set_bool(all_opts, "cache.direct",
 798                               !!(flags & BDRV_O_NOCACHE));
 799         }
 800         if (!qemu_opt_get(all_opts, "cache.no-flush")) {
 801             qemu_opt_set_bool(all_opts, "cache.no-flush",
 802                               !!(flags & BDRV_O_NO_FLUSH));
 803         }
 804         qemu_opt_unset(all_opts, "cache");
 805     }
 806
 807     return blockdev_init(all_opts, block_default_type);
 808 }
 809
 810 void do_commit(Monitor *mon, const QDict *qdict)
 811 {
 812     const char *device = qdict_get_str(qdict, "device");
 813     BlockDriverState *bs;
 814     int ret;
 815
 816     if (!strcmp(device, "all")) {
 817         ret = bdrv_commit_all();
 818     } else {
 819         bs = bdrv_find(device);
 820         if (!bs) {
 821             monitor_printf(mon, "Device '%s' not found\n", device);
 822             return;
 823         }
 824         ret = bdrv_commit(bs);
 825     }
 826     if (ret < 0) {
 827         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 828                        strerror(-ret));
 829     }
 830 }
 831
 832 static void blockdev_do_action(int kind, void *data, Error **errp)
 833 {
 834     TransactionAction action;
 835     TransactionActionList list;
 836
 837     action.kind = kind;
 838     action.data = data;
 839     list.value = &action;
 840     list.next = NULL;
 841     qmp_transaction(&list, errp);
 842 }
 843
 844 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 845                                 bool has_format, const char *format,
 846                                 bool has_mode, enum NewImageMode mode,
 847                                 Error **errp)
 848 {
 849     BlockdevSnapshot snapshot = {
 850         .device = (char *) device,
 851         .snapshot_file = (char *) snapshot_file,
 852         .has_format = has_format,
 853         .format = (char *) format,
 854         .has_mode = has_mode,
 855         .mode = mode,
 856     };
 857     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
 858                        &snapshot, errp);
 859 }
 860
 861 void qmp_blockdev_snapshot_internal_sync(const char *device,
 862                                          const char *name,
 863                                          Error **errp)
 864 {
 865     BlockdevSnapshotInternal snapshot = {
 866         .device = (char *) device,
 867         .name = (char *) name
 868     };
 869
 870     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
 871                        &snapshot, errp);
 872 }
 873
 874 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
 875                                                          bool has_id,
 876                                                          const char *id,
 877                                                          bool has_name,
 878                                                          const char *name,
 879                                                          Error **errp)
 880 {
 881     BlockDriverState *bs = bdrv_find(device);
 882     QEMUSnapshotInfo sn;
 883     Error *local_err = NULL;
 884     SnapshotInfo *info = NULL;
 885     int ret;
 886
 887     if (!bs) {
 888         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 889         return NULL;
 890     }
 891
 892     if (!has_id) {
 893         id = NULL;
 894     }
 895
 896     if (!has_name) {
 897         name = NULL;
 898     }
 899
 900     if (!id && !name) {
 901         error_setg(errp, "Name or id must be provided");
 902         return NULL;
 903     }
 904
 905     ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
 906     if (error_is_set(&local_err)) {
 907         error_propagate(errp, local_err);
 908         return NULL;
 909     }
 910     if (!ret) {
 911         error_setg(errp,
 912                    "Snapshot with id '%s' and name '%s' does not exist on "
 913                    "device '%s'",
 914                    STR_OR_NULL(id), STR_OR_NULL(name), device);
 915         return NULL;
 916     }
 917
 918     bdrv_snapshot_delete(bs, id, name, &local_err);
 919     if (error_is_set(&local_err)) {
 920         error_propagate(errp, local_err);
 921         return NULL;
 922     }
 923
 924     info = g_malloc0(sizeof(SnapshotInfo));
 925     info->id = g_strdup(sn.id_str);
 926     info->name = g_strdup(sn.name);
 927     info->date_nsec = sn.date_nsec;
 928     info->date_sec = sn.date_sec;
 929     info->vm_state_size = sn.vm_state_size;
 930     info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
 931     info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
 932
 933     return info;
 934 }
 935
 936 /* New and old BlockDriverState structs for group snapshots */
 937
 938 typedef struct BlkTransactionState BlkTransactionState;
 939
 940 /* Only prepare() may fail. In a single transaction, only one of commit() or
 941    abort() will be called, clean() will always be called if it present. */
 942 typedef struct BdrvActionOps {
 943     /* Size of state struct, in bytes. */
 944     size_t instance_size;
 945     /* Prepare the work, must NOT be NULL. */
 946     void (*prepare)(BlkTransactionState *common, Error **errp);
 947     /* Commit the changes, can be NULL. */
 948     void (*commit)(BlkTransactionState *common);
 949     /* Abort the changes on fail, can be NULL. */
 950     void (*abort)(BlkTransactionState *common);
 951     /* Clean up resource in the end, can be NULL. */
 952     void (*clean)(BlkTransactionState *common);
 953 } BdrvActionOps;
 954
 955 /*
 956  * This structure must be arranged as first member in child type, assuming
 957  * that compiler will also arrange it to the same address with parent instance.
 958  * Later it will be used in free().
 959  */
 960 struct BlkTransactionState {
 961     TransactionAction *action;
 962     const BdrvActionOps *ops;
 963     QSIMPLEQ_ENTRY(BlkTransactionState) entry;
 964 };
 965
 966 /* internal snapshot private data */
 967 typedef struct InternalSnapshotState {
 968     BlkTransactionState common;
 969     BlockDriverState *bs;
 970     QEMUSnapshotInfo sn;
 971 } InternalSnapshotState;
 972
 973 static void internal_snapshot_prepare(BlkTransactionState *common,
 974                                       Error **errp)
 975 {
 976     const char *device;
 977     const char *name;
 978     BlockDriverState *bs;
 979     QEMUSnapshotInfo old_sn, *sn;
 980     bool ret;
 981     qemu_timeval tv;
 982     BlockdevSnapshotInternal *internal;
 983     InternalSnapshotState *state;
 984     int ret1;
 985
 986     g_assert(common->action->kind ==
 987              TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
 988     internal = common->action->blockdev_snapshot_internal_sync;
 989     state = DO_UPCAST(InternalSnapshotState, common, common);
 990
 991     /* 1. parse input */
 992     device = internal->device;
 993     name = internal->name;
 994
 995     /* 2. check for validation */
 996     bs = bdrv_find(device);
 997     if (!bs) {
 998         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 999         return;
1000     }
1001
1002     if (!bdrv_is_inserted(bs)) {
1003         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1004         return;
1005     }
1006
1007     if (bdrv_is_read_only(bs)) {
1008         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1009         return;
1010     }
1011
1012     if (!bdrv_can_snapshot(bs)) {
1013         error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1014                   bs->drv->format_name, device, "internal snapshot");
1015         return;
1016     }
1017
1018     if (!strlen(name)) {
1019         error_setg(errp, "Name is empty");
1020         return;
1021     }
1022
1023     /* check whether a snapshot with name exist */
1024     ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1025     if (error_is_set(errp)) {
1026         return;
1027     } else if (ret) {
1028         error_setg(errp,
1029                    "Snapshot with name '%s' already exists on device '%s'",
1030                    name, device);
1031         return;
1032     }
1033
1034     /* 3. take the snapshot */
1035     sn = &state->sn;
1036     pstrcpy(sn->name, sizeof(sn->name), name);
1037     qemu_gettimeofday(&tv);
1038     sn->date_sec = tv.tv_sec;
1039     sn->date_nsec = tv.tv_usec * 1000;
1040     sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1041
1042     ret1 = bdrv_snapshot_create(bs, sn);
1043     if (ret1 < 0) {
1044         error_setg_errno(errp, -ret1,
1045                          "Failed to create snapshot '%s' on device '%s'",
1046                          name, device);
1047         return;
1048     }
1049
1050     /* 4. succeed, mark a snapshot is created */
1051     state->bs = bs;
1052 }
1053
1054 static void internal_snapshot_abort(BlkTransactionState *common)
1055 {
1056     InternalSnapshotState *state =
1057                              DO_UPCAST(InternalSnapshotState, common, common);
1058     BlockDriverState *bs = state->bs;
1059     QEMUSnapshotInfo *sn = &state->sn;
1060     Error *local_error = NULL;
1061
1062     if (!bs) {
1063         return;
1064     }
1065
1066     if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1067         error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1068                      "device '%s' in abort: %s",
1069                      sn->id_str,
1070                      sn->name,
1071                      bdrv_get_device_name(bs),
1072                      error_get_pretty(local_error));
1073         error_free(local_error);
1074     }
1075 }
1076
1077 /* external snapshot private data */
1078 typedef struct ExternalSnapshotState {
1079     BlkTransactionState common;
1080     BlockDriverState *old_bs;
1081     BlockDriverState *new_bs;
1082 } ExternalSnapshotState;
1083
1084 static void external_snapshot_prepare(BlkTransactionState *common,
1085                                       Error **errp)
1086 {
1087     BlockDriver *drv;
1088     int flags, ret;
1089     Error *local_err = NULL;
1090     const char *device;
1091     const char *new_image_file;
1092     const char *format = "qcow2";
1093     enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1094     ExternalSnapshotState *state =
1095                              DO_UPCAST(ExternalSnapshotState, common, common);
1096     TransactionAction *action = common->action;
1097
1098     /* get parameters */
1099     g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1100
1101     device = action->blockdev_snapshot_sync->device;
1102     new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1103     if (action->blockdev_snapshot_sync->has_format) {
1104         format = action->blockdev_snapshot_sync->format;
1105     }
1106     if (action->blockdev_snapshot_sync->has_mode) {
1107         mode = action->blockdev_snapshot_sync->mode;
1108     }
1109
1110     /* start processing */
1111     drv = bdrv_find_format(format);
1112     if (!drv) {
1113         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1114         return;
1115     }
1116
1117     state->old_bs = bdrv_find(device);
1118     if (!state->old_bs) {
1119         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1120         return;
1121     }
1122
1123     if (!bdrv_is_inserted(state->old_bs)) {
1124         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1125         return;
1126     }
1127
1128     if (bdrv_in_use(state->old_bs)) {
1129         error_set(errp, QERR_DEVICE_IN_USE, device);
1130         return;
1131     }
1132
1133     if (!bdrv_is_read_only(state->old_bs)) {
1134         if (bdrv_flush(state->old_bs)) {
1135             error_set(errp, QERR_IO_ERROR);
1136             return;
1137         }
1138     }
1139
1140     flags = state->old_bs->open_flags;
1141
1142     /* create new image w/backing file */
1143     if (mode != NEW_IMAGE_MODE_EXISTING) {
1144         bdrv_img_create(new_image_file, format,
1145                         state->old_bs->filename,
1146                         state->old_bs->drv->format_name,
1147                         NULL, -1, flags, &local_err, false);
1148         if (error_is_set(&local_err)) {
1149             error_propagate(errp, local_err);
1150             return;
1151         }
1152     }
1153
1154     /* We will manually add the backing_hd field to the bs later */
1155     state->new_bs = bdrv_new("");
1156     /* TODO Inherit bs->options or only take explicit options with an
1157      * extended QMP command? */
1158     ret = bdrv_open(state->new_bs, new_image_file, NULL,
1159                     flags | BDRV_O_NO_BACKING, drv);
1160     if (ret != 0) {
1161         error_setg_file_open(errp, -ret, new_image_file);
1162     }
1163 }
1164
1165 static void external_snapshot_commit(BlkTransactionState *common)
1166 {
1167     ExternalSnapshotState *state =
1168                              DO_UPCAST(ExternalSnapshotState, common, common);
1169
1170     /* This removes our old bs and adds the new bs */
1171     bdrv_append(state->new_bs, state->old_bs);
1172     /* We don't need (or want) to use the transactional
1173      * bdrv_reopen_multiple() across all the entries at once, because we
1174      * don't want to abort all of them if one of them fails the reopen */
1175     bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1176                 NULL);
1177 }
1178
1179 static void external_snapshot_abort(BlkTransactionState *common)
1180 {
1181     ExternalSnapshotState *state =
1182                              DO_UPCAST(ExternalSnapshotState, common, common);
1183     if (state->new_bs) {
1184         bdrv_unref(state->new_bs);
1185     }
1186 }
1187
1188 typedef struct DriveBackupState {
1189     BlkTransactionState common;
1190     BlockDriverState *bs;
1191     BlockJob *job;
1192 } DriveBackupState;
1193
1194 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1195 {
1196     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1197     DriveBackup *backup;
1198     Error *local_err = NULL;
1199
1200     assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1201     backup = common->action->drive_backup;
1202
1203     qmp_drive_backup(backup->device, backup->target,
1204                      backup->has_format, backup->format,
1205                      backup->sync,
1206                      backup->has_mode, backup->mode,
1207                      backup->has_speed, backup->speed,
1208                      backup->has_on_source_error, backup->on_source_error,
1209                      backup->has_on_target_error, backup->on_target_error,
1210                      &local_err);
1211     if (error_is_set(&local_err)) {
1212         error_propagate(errp, local_err);
1213         state->bs = NULL;
1214         state->job = NULL;
1215         return;
1216     }
1217
1218     state->bs = bdrv_find(backup->device);
1219     state->job = state->bs->job;
1220 }
1221
1222 static void drive_backup_abort(BlkTransactionState *common)
1223 {
1224     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1225     BlockDriverState *bs = state->bs;
1226
1227     /* Only cancel if it's the job we started */
1228     if (bs && bs->job && bs->job == state->job) {
1229         block_job_cancel_sync(bs->job);
1230     }
1231 }
1232
1233 static void abort_prepare(BlkTransactionState *common, Error **errp)
1234 {
1235     error_setg(errp, "Transaction aborted using Abort action");
1236 }
1237
1238 static void abort_commit(BlkTransactionState *common)
1239 {
1240     g_assert_not_reached(); /* this action never succeeds */
1241 }
1242
1243 static const BdrvActionOps actions[] = {
1244     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1245         .instance_size = sizeof(ExternalSnapshotState),
1246         .prepare  = external_snapshot_prepare,
1247         .commit   = external_snapshot_commit,
1248         .abort = external_snapshot_abort,
1249     },
1250     [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1251         .instance_size = sizeof(DriveBackupState),
1252         .prepare = drive_backup_prepare,
1253         .abort = drive_backup_abort,
1254     },
1255     [TRANSACTION_ACTION_KIND_ABORT] = {
1256         .instance_size = sizeof(BlkTransactionState),
1257         .prepare = abort_prepare,
1258         .commit = abort_commit,
1259     },
1260     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1261         .instance_size = sizeof(InternalSnapshotState),
1262         .prepare  = internal_snapshot_prepare,
1263         .abort = internal_snapshot_abort,
1264     },
1265 };
1266
1267 /*
1268  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
1269  *  then we do not pivot any of the devices in the group, and abandon the
1270  *  snapshots
1271  */
1272 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1273 {
1274     TransactionActionList *dev_entry = dev_list;
1275     BlkTransactionState *state, *next;
1276     Error *local_err = NULL;
1277
1278     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1279     QSIMPLEQ_INIT(&snap_bdrv_states);
1280
1281     /* drain all i/o before any snapshots */
1282     bdrv_drain_all();
1283
1284     /* We don't do anything in this loop that commits us to the snapshot */
1285     while (NULL != dev_entry) {
1286         TransactionAction *dev_info = NULL;
1287         const BdrvActionOps *ops;
1288
1289         dev_info = dev_entry->value;
1290         dev_entry = dev_entry->next;
1291
1292         assert(dev_info->kind < ARRAY_SIZE(actions));
1293
1294         ops = &actions[dev_info->kind];
1295         state = g_malloc0(ops->instance_size);
1296         state->ops = ops;
1297         state->action = dev_info;
1298         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1299
1300         state->ops->prepare(state, &local_err);
1301         if (error_is_set(&local_err)) {
1302             error_propagate(errp, local_err);
1303             goto delete_and_fail;
1304         }
1305     }
1306
1307     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1308         if (state->ops->commit) {
1309             state->ops->commit(state);
1310         }
1311     }
1312
1313     /* success */
1314     goto exit;
1315
1316 delete_and_fail:
1317     /*
1318     * failure, and it is all-or-none; abandon each new bs, and keep using
1319     * the original bs for all images
1320     */
1321     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1322         if (state->ops->abort) {
1323             state->ops->abort(state);
1324         }
1325     }
1326 exit:
1327     QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1328         if (state->ops->clean) {
1329             state->ops->clean(state);
1330         }
1331         g_free(state);
1332     }
1333 }
1334
1335
1336 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1337 {
1338     if (bdrv_in_use(bs)) {
1339         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1340         return;
1341     }
1342     if (!bdrv_dev_has_removable_media(bs)) {
1343         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1344         return;
1345     }
1346
1347     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1348         bdrv_dev_eject_request(bs, force);
1349         if (!force) {
1350             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1351             return;
1352         }
1353     }
1354
1355     bdrv_close(bs);
1356 }
1357
1358 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1359 {
1360     BlockDriverState *bs;
1361
1362     bs = bdrv_find(device);
1363     if (!bs) {
1364         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1365         return;
1366     }
1367
1368     eject_device(bs, force, errp);
1369 }
1370
1371 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1372 {
1373     BlockDriverState *bs;
1374     int err;
1375
1376     bs = bdrv_find(device);
1377     if (!bs) {
1378         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1379         return;
1380     }
1381
1382     err = bdrv_set_key(bs, password);
1383     if (err == -EINVAL) {
1384         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1385         return;
1386     } else if (err < 0) {
1387         error_set(errp, QERR_INVALID_PASSWORD);
1388         return;
1389     }
1390 }
1391
1392 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1393                                     int bdrv_flags, BlockDriver *drv,
1394                                     const char *password, Error **errp)
1395 {
1396     int ret;
1397
1398     ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv);
1399     if (ret < 0) {
1400         error_setg_file_open(errp, -ret, filename);
1401         return;
1402     }
1403
1404     if (bdrv_key_required(bs)) {
1405         if (password) {
1406             if (bdrv_set_key(bs, password) < 0) {
1407                 error_set(errp, QERR_INVALID_PASSWORD);
1408             }
1409         } else {
1410             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1411                       bdrv_get_encrypted_filename(bs));
1412         }
1413     } else if (password) {
1414         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1415     }
1416 }
1417
1418 void qmp_change_blockdev(const char *device, const char *filename,
1419                          bool has_format, const char *format, Error **errp)
1420 {
1421     BlockDriverState *bs;
1422     BlockDriver *drv = NULL;
1423     int bdrv_flags;
1424     Error *err = NULL;
1425
1426     bs = bdrv_find(device);
1427     if (!bs) {
1428         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1429         return;
1430     }
1431
1432     if (format) {
1433         drv = bdrv_find_whitelisted_format(format, bs->read_only);
1434         if (!drv) {
1435             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1436             return;
1437         }
1438     }
1439
1440     eject_device(bs, 0, &err);
1441     if (error_is_set(&err)) {
1442         error_propagate(errp, err);
1443         return;
1444     }
1445
1446     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1447     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1448
1449     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1450 }
1451
1452 /* throttling disk I/O limits */
1453 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1454                                int64_t bps_wr,
1455                                int64_t iops,
1456                                int64_t iops_rd,
1457                                int64_t iops_wr,
1458                                bool has_bps_max,
1459                                int64_t bps_max,
1460                                bool has_bps_rd_max,
1461                                int64_t bps_rd_max,
1462                                bool has_bps_wr_max,
1463                                int64_t bps_wr_max,
1464                                bool has_iops_max,
1465                                int64_t iops_max,
1466                                bool has_iops_rd_max,
1467                                int64_t iops_rd_max,
1468                                bool has_iops_wr_max,
1469                                int64_t iops_wr_max,
1470                                bool has_iops_size,
1471                                int64_t iops_size, Error **errp)
1472 {
1473     ThrottleConfig cfg;
1474     BlockDriverState *bs;
1475
1476     bs = bdrv_find(device);
1477     if (!bs) {
1478         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1479         return;
1480     }
1481
1482     memset(&cfg, 0, sizeof(cfg));
1483     cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1484     cfg.buckets[THROTTLE_BPS_READ].avg  = bps_rd;
1485     cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1486
1487     cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1488     cfg.buckets[THROTTLE_OPS_READ].avg  = iops_rd;
1489     cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1490
1491     if (has_bps_max) {
1492         cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1493     }
1494     if (has_bps_rd_max) {
1495         cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1496     }
1497     if (has_bps_wr_max) {
1498         cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1499     }
1500     if (has_iops_max) {
1501         cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1502     }
1503     if (has_iops_rd_max) {
1504         cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1505     }
1506     if (has_iops_wr_max) {
1507         cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1508     }
1509
1510     if (has_iops_size) {
1511         cfg.op_size = iops_size;
1512     }
1513
1514     if (!check_throttle_config(&cfg, errp)) {
1515         return;
1516     }
1517
1518     if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1519         bdrv_io_limits_enable(bs);
1520     } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1521         bdrv_io_limits_disable(bs);
1522     }
1523
1524     if (bs->io_limits_enabled) {
1525         bdrv_set_io_limits(bs, &cfg);
1526     }
1527 }
1528
1529 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1530 {
1531     const char *id = qdict_get_str(qdict, "id");
1532     BlockDriverState *bs;
1533
1534     bs = bdrv_find(id);
1535     if (!bs) {
1536         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1537         return -1;
1538     }
1539     if (bdrv_in_use(bs)) {
1540         qerror_report(QERR_DEVICE_IN_USE, id);
1541         return -1;
1542     }
1543
1544     /* quiesce block driver; prevent further io */
1545     bdrv_drain_all();
1546     bdrv_flush(bs);
1547     bdrv_close(bs);
1548
1549     /* if we have a device attached to this BlockDriverState
1550      * then we need to make the drive anonymous until the device
1551      * can be removed.  If this is a drive with no device backing
1552      * then we can just get rid of the block driver state right here.
1553      */
1554     if (bdrv_get_attached_dev(bs)) {
1555         bdrv_make_anon(bs);
1556
1557         /* Further I/O must not pause the guest */
1558         bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1559                           BLOCKDEV_ON_ERROR_REPORT);
1560     } else {
1561         drive_uninit(drive_get_by_blockdev(bs));
1562     }
1563
1564     return 0;
1565 }
1566
1567 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1568 {
1569     BlockDriverState *bs;
1570     int ret;
1571
1572     bs = bdrv_find(device);
1573     if (!bs) {
1574         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1575         return;
1576     }
1577
1578     if (size < 0) {
1579         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1580         return;
1581     }
1582
1583     /* complete all in-flight operations before resizing the device */
1584     bdrv_drain_all();
1585
1586     ret = bdrv_truncate(bs, size);
1587     switch (ret) {
1588     case 0:
1589         break;
1590     case -ENOMEDIUM:
1591         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1592         break;
1593     case -ENOTSUP:
1594         error_set(errp, QERR_UNSUPPORTED);
1595         break;
1596     case -EACCES:
1597         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1598         break;
1599     case -EBUSY:
1600         error_set(errp, QERR_DEVICE_IN_USE, device);
1601         break;
1602     default:
1603         error_setg_errno(errp, -ret, "Could not resize");
1604         break;
1605     }
1606 }
1607
1608 static void block_job_cb(void *opaque, int ret)
1609 {
1610     BlockDriverState *bs = opaque;
1611     QObject *obj;
1612
1613     trace_block_job_cb(bs, bs->job, ret);
1614
1615     assert(bs->job);
1616     obj = qobject_from_block_job(bs->job);
1617     if (ret < 0) {
1618         QDict *dict = qobject_to_qdict(obj);
1619         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1620     }
1621
1622     if (block_job_is_cancelled(bs->job)) {
1623         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1624     } else {
1625         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1626     }
1627     qobject_decref(obj);
1628
1629     bdrv_put_ref_bh_schedule(bs);
1630 }
1631
1632 void qmp_block_stream(const char *device, bool has_base,
1633                       const char *base, bool has_speed, int64_t speed,
1634                       bool has_on_error, BlockdevOnError on_error,
1635                       Error **errp)
1636 {
1637     BlockDriverState *bs;
1638     BlockDriverState *base_bs = NULL;
1639     Error *local_err = NULL;
1640
1641     if (!has_on_error) {
1642         on_error = BLOCKDEV_ON_ERROR_REPORT;
1643     }
1644
1645     bs = bdrv_find(device);
1646     if (!bs) {
1647         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1648         return;
1649     }
1650
1651     if (base) {
1652         base_bs = bdrv_find_backing_image(bs, base);
1653         if (base_bs == NULL) {
1654             error_set(errp, QERR_BASE_NOT_FOUND, base);
1655             return;
1656         }
1657     }
1658
1659     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1660                  on_error, block_job_cb, bs, &local_err);
1661     if (error_is_set(&local_err)) {
1662         error_propagate(errp, local_err);
1663         return;
1664     }
1665
1666     trace_qmp_block_stream(bs, bs->job);
1667 }
1668
1669 void qmp_block_commit(const char *device,
1670                       bool has_base, const char *base, const char *top,
1671                       bool has_speed, int64_t speed,
1672                       Error **errp)
1673 {
1674     BlockDriverState *bs;
1675     BlockDriverState *base_bs, *top_bs;
1676     Error *local_err = NULL;
1677     /* This will be part of the QMP command, if/when the
1678      * BlockdevOnError change for blkmirror makes it in
1679      */
1680     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1681
1682     /* drain all i/o before commits */
1683     bdrv_drain_all();
1684
1685     bs = bdrv_find(device);
1686     if (!bs) {
1687         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1688         return;
1689     }
1690
1691     /* default top_bs is the active layer */
1692     top_bs = bs;
1693
1694     if (top) {
1695         if (strcmp(bs->filename, top) != 0) {
1696             top_bs = bdrv_find_backing_image(bs, top);
1697         }
1698     }
1699
1700     if (top_bs == NULL) {
1701         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1702         return;
1703     }
1704
1705     if (has_base && base) {
1706         base_bs = bdrv_find_backing_image(top_bs, base);
1707     } else {
1708         base_bs = bdrv_find_base(top_bs);
1709     }
1710
1711     if (base_bs == NULL) {
1712         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1713         return;
1714     }
1715
1716     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1717                 &local_err);
1718     if (local_err != NULL) {
1719         error_propagate(errp, local_err);
1720         return;
1721     }
1722 }
1723
1724 void qmp_drive_backup(const char *device, const char *target,
1725                       bool has_format, const char *format,
1726                       enum MirrorSyncMode sync,
1727                       bool has_mode, enum NewImageMode mode,
1728                       bool has_speed, int64_t speed,
1729                       bool has_on_source_error, BlockdevOnError on_source_error,
1730                       bool has_on_target_error, BlockdevOnError on_target_error,
1731                       Error **errp)
1732 {
1733     BlockDriverState *bs;
1734     BlockDriverState *target_bs;
1735     BlockDriverState *source = NULL;
1736     BlockDriver *drv = NULL;
1737     Error *local_err = NULL;
1738     int flags;
1739     int64_t size;
1740     int ret;
1741
1742     if (!has_speed) {
1743         speed = 0;
1744     }
1745     if (!has_on_source_error) {
1746         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1747     }
1748     if (!has_on_target_error) {
1749         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1750     }
1751     if (!has_mode) {
1752         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1753     }
1754
1755     bs = bdrv_find(device);
1756     if (!bs) {
1757         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1758         return;
1759     }
1760
1761     if (!bdrv_is_inserted(bs)) {
1762         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1763         return;
1764     }
1765
1766     if (!has_format) {
1767         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1768     }
1769     if (format) {
1770         drv = bdrv_find_format(format);
1771         if (!drv) {
1772             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1773             return;
1774         }
1775     }
1776
1777     if (bdrv_in_use(bs)) {
1778         error_set(errp, QERR_DEVICE_IN_USE, device);
1779         return;
1780     }
1781
1782     flags = bs->open_flags | BDRV_O_RDWR;
1783
1784     /* See if we have a backing HD we can use to create our new image
1785      * on top of. */
1786     if (sync == MIRROR_SYNC_MODE_TOP) {
1787         source = bs->backing_hd;
1788         if (!source) {
1789             sync = MIRROR_SYNC_MODE_FULL;
1790         }
1791     }
1792     if (sync == MIRROR_SYNC_MODE_NONE) {
1793         source = bs;
1794     }
1795
1796     size = bdrv_getlength(bs);
1797     if (size < 0) {
1798         error_setg_errno(errp, -size, "bdrv_getlength failed");
1799         return;
1800     }
1801
1802     if (mode != NEW_IMAGE_MODE_EXISTING) {
1803         assert(format && drv);
1804         if (source) {
1805             bdrv_img_create(target, format, source->filename,
1806                             source->drv->format_name, NULL,
1807                             size, flags, &local_err, false);
1808         } else {
1809             bdrv_img_create(target, format, NULL, NULL, NULL,
1810                             size, flags, &local_err, false);
1811         }
1812     }
1813
1814     if (error_is_set(&local_err)) {
1815         error_propagate(errp, local_err);
1816         return;
1817     }
1818
1819     target_bs = bdrv_new("");
1820     ret = bdrv_open(target_bs, target, NULL, flags, drv);
1821     if (ret < 0) {
1822         bdrv_unref(target_bs);
1823         error_setg_file_open(errp, -ret, target);
1824         return;
1825     }
1826
1827     backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1828                  block_job_cb, bs, &local_err);
1829     if (local_err != NULL) {
1830         bdrv_unref(target_bs);
1831         error_propagate(errp, local_err);
1832         return;
1833     }
1834 }
1835
1836 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1837
1838 void qmp_drive_mirror(const char *device, const char *target,
1839                       bool has_format, const char *format,
1840                       enum MirrorSyncMode sync,
1841                       bool has_mode, enum NewImageMode mode,
1842                       bool has_speed, int64_t speed,
1843                       bool has_granularity, uint32_t granularity,
1844                       bool has_buf_size, int64_t buf_size,
1845                       bool has_on_source_error, BlockdevOnError on_source_error,
1846                       bool has_on_target_error, BlockdevOnError on_target_error,
1847                       Error **errp)
1848 {
1849     BlockDriverState *bs;
1850     BlockDriverState *source, *target_bs;
1851     BlockDriver *drv = NULL;
1852     Error *local_err = NULL;
1853     int flags;
1854     int64_t size;
1855     int ret;
1856
1857     if (!has_speed) {
1858         speed = 0;
1859     }
1860     if (!has_on_source_error) {
1861         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1862     }
1863     if (!has_on_target_error) {
1864         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1865     }
1866     if (!has_mode) {
1867         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1868     }
1869     if (!has_granularity) {
1870         granularity = 0;
1871     }
1872     if (!has_buf_size) {
1873         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1874     }
1875
1876     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1877         error_set(errp, QERR_INVALID_PARAMETER, device);
1878         return;
1879     }
1880     if (granularity & (granularity - 1)) {
1881         error_set(errp, QERR_INVALID_PARAMETER, device);
1882         return;
1883     }
1884
1885     bs = bdrv_find(device);
1886     if (!bs) {
1887         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1888         return;
1889     }
1890
1891     if (!bdrv_is_inserted(bs)) {
1892         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1893         return;
1894     }
1895
1896     if (!has_format) {
1897         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1898     }
1899     if (format) {
1900         drv = bdrv_find_format(format);
1901         if (!drv) {
1902             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1903             return;
1904         }
1905     }
1906
1907     if (bdrv_in_use(bs)) {
1908         error_set(errp, QERR_DEVICE_IN_USE, device);
1909         return;
1910     }
1911
1912     flags = bs->open_flags | BDRV_O_RDWR;
1913     source = bs->backing_hd;
1914     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1915         sync = MIRROR_SYNC_MODE_FULL;
1916     }
1917
1918     size = bdrv_getlength(bs);
1919     if (size < 0) {
1920         error_setg_errno(errp, -size, "bdrv_getlength failed");
1921         return;
1922     }
1923
1924     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1925         /* create new image w/o backing file */
1926         assert(format && drv);
1927         bdrv_img_create(target, format,
1928                         NULL, NULL, NULL, size, flags, &local_err, false);
1929     } else {
1930         switch (mode) {
1931         case NEW_IMAGE_MODE_EXISTING:
1932             ret = 0;
1933             break;
1934         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1935             /* create new image with backing file */
1936             bdrv_img_create(target, format,
1937                             source->filename,
1938                             source->drv->format_name,
1939                             NULL, size, flags, &local_err, false);
1940             break;
1941         default:
1942             abort();
1943         }
1944     }
1945
1946     if (error_is_set(&local_err)) {
1947         error_propagate(errp, local_err);
1948         return;
1949     }
1950
1951     /* Mirroring takes care of copy-on-write using the source's backing
1952      * file.
1953      */
1954     target_bs = bdrv_new("");
1955     ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
1956     if (ret < 0) {
1957         bdrv_unref(target_bs);
1958         error_setg_file_open(errp, -ret, target);
1959         return;
1960     }
1961
1962     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1963                  on_source_error, on_target_error,
1964                  block_job_cb, bs, &local_err);
1965     if (local_err != NULL) {
1966         bdrv_unref(target_bs);
1967         error_propagate(errp, local_err);
1968         return;
1969     }
1970 }
1971
1972 static BlockJob *find_block_job(const char *device)
1973 {
1974     BlockDriverState *bs;
1975
1976     bs = bdrv_find(device);
1977     if (!bs || !bs->job) {
1978         return NULL;
1979     }
1980     return bs->job;
1981 }
1982
1983 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1984 {
1985     BlockJob *job = find_block_job(device);
1986
1987     if (!job) {
1988         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1989         return;
1990     }
1991
1992     block_job_set_speed(job, speed, errp);
1993 }
1994
1995 void qmp_block_job_cancel(const char *device,
1996                           bool has_force, bool force, Error **errp)
1997 {
1998     BlockJob *job = find_block_job(device);
1999
2000     if (!has_force) {
2001         force = false;
2002     }
2003
2004     if (!job) {
2005         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2006         return;
2007     }
2008     if (job->paused && !force) {
2009         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2010         return;
2011     }
2012
2013     trace_qmp_block_job_cancel(job);
2014     block_job_cancel(job);
2015 }
2016
2017 void qmp_block_job_pause(const char *device, Error **errp)
2018 {
2019     BlockJob *job = find_block_job(device);
2020
2021     if (!job) {
2022         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2023         return;
2024     }
2025
2026     trace_qmp_block_job_pause(job);
2027     block_job_pause(job);
2028 }
2029
2030 void qmp_block_job_resume(const char *device, Error **errp)
2031 {
2032     BlockJob *job = find_block_job(device);
2033
2034     if (!job) {
2035         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2036         return;
2037     }
2038
2039     trace_qmp_block_job_resume(job);
2040     block_job_resume(job);
2041 }
2042
2043 void qmp_block_job_complete(const char *device, Error **errp)
2044 {
2045     BlockJob *job = find_block_job(device);
2046
2047     if (!job) {
2048         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2049         return;
2050     }
2051
2052     trace_qmp_block_job_complete(job);
2053     block_job_complete(job, errp);
2054 }
2055
2056 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2057 {
2058     BlockJobInfoList **prev = opaque;
2059     BlockJob *job = bs->job;
2060
2061     if (job) {
2062         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2063         elem->value = block_job_query(bs->job);
2064         (*prev)->next = elem;
2065         *prev = elem;
2066     }
2067 }
2068
2069 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2070 {
2071     /* Dummy is a fake list element for holding the head pointer */
2072     BlockJobInfoList dummy = {};
2073     BlockJobInfoList *prev = &dummy;
2074     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2075     return dummy.next;
2076 }
2077
2078 QemuOptsList qemu_common_drive_opts = {
2079     .name = "drive",
2080     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2081     .desc = {
2082         {
2083             .name = "bus",
2084             .type = QEMU_OPT_NUMBER,
2085             .help = "bus number",
2086         },{
2087             .name = "unit",
2088             .type = QEMU_OPT_NUMBER,
2089             .help = "unit number (i.e. lun for scsi)",
2090         },{
2091             .name = "if",
2092             .type = QEMU_OPT_STRING,
2093             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
2094         },{
2095             .name = "index",
2096             .type = QEMU_OPT_NUMBER,
2097             .help = "index number",
2098         },{
2099             .name = "cyls",
2100             .type = QEMU_OPT_NUMBER,
2101             .help = "number of cylinders (ide disk geometry)",
2102         },{
2103             .name = "heads",
2104             .type = QEMU_OPT_NUMBER,
2105             .help = "number of heads (ide disk geometry)",
2106         },{
2107             .name = "secs",
2108             .type = QEMU_OPT_NUMBER,
2109             .help = "number of sectors (ide disk geometry)",
2110         },{
2111             .name = "trans",
2112             .type = QEMU_OPT_STRING,
2113             .help = "chs translation (auto, lba. none)",
2114         },{
2115             .name = "media",
2116             .type = QEMU_OPT_STRING,
2117             .help = "media type (disk, cdrom)",
2118         },{
2119             .name = "snapshot",
2120             .type = QEMU_OPT_BOOL,
2121             .help = "enable/disable snapshot mode",
2122         },{
2123             .name = "file",
2124             .type = QEMU_OPT_STRING,
2125             .help = "disk image",
2126         },{
2127             .name = "discard",
2128             .type = QEMU_OPT_STRING,
2129             .help = "discard operation (ignore/off, unmap/on)",
2130         },{
2131             .name = "cache.writeback",
2132             .type = QEMU_OPT_BOOL,
2133             .help = "enables writeback mode for any caches",
2134         },{
2135             .name = "cache.direct",
2136             .type = QEMU_OPT_BOOL,
2137             .help = "enables use of O_DIRECT (bypass the host page cache)",
2138         },{
2139             .name = "cache.no-flush",
2140             .type = QEMU_OPT_BOOL,
2141             .help = "ignore any flush requests for the device",
2142         },{
2143             .name = "aio",
2144             .type = QEMU_OPT_STRING,
2145             .help = "host AIO implementation (threads, native)",
2146         },{
2147             .name = "format",
2148             .type = QEMU_OPT_STRING,
2149             .help = "disk format (raw, qcow2, ...)",
2150         },{
2151             .name = "serial",
2152             .type = QEMU_OPT_STRING,
2153             .help = "disk serial number",
2154         },{
2155             .name = "rerror",
2156             .type = QEMU_OPT_STRING,
2157             .help = "read error action",
2158         },{
2159             .name = "werror",
2160             .type = QEMU_OPT_STRING,
2161             .help = "write error action",
2162         },{
2163             .name = "addr",
2164             .type = QEMU_OPT_STRING,
2165             .help = "pci address (virtio only)",
2166         },{
2167             .name = "read-only",
2168             .type = QEMU_OPT_BOOL,
2169             .help = "open drive file as read-only",
2170         },{
2171             .name = "throttling.iops-total",
2172             .type = QEMU_OPT_NUMBER,
2173             .help = "limit total I/O operations per second",
2174         },{
2175             .name = "throttling.iops-read",
2176             .type = QEMU_OPT_NUMBER,
2177             .help = "limit read operations per second",
2178         },{
2179             .name = "throttling.iops-write",
2180             .type = QEMU_OPT_NUMBER,
2181             .help = "limit write operations per second",
2182         },{
2183             .name = "throttling.bps-total",
2184             .type = QEMU_OPT_NUMBER,
2185             .help = "limit total bytes per second",
2186         },{
2187             .name = "throttling.bps-read",
2188             .type = QEMU_OPT_NUMBER,
2189             .help = "limit read bytes per second",
2190         },{
2191             .name = "throttling.bps-write",
2192             .type = QEMU_OPT_NUMBER,
2193             .help = "limit write bytes per second",
2194         },{
2195             .name = "throttling.iops-total-max",
2196             .type = QEMU_OPT_NUMBER,
2197             .help = "I/O operations burst",
2198         },{
2199             .name = "throttling.iops-read-max",
2200             .type = QEMU_OPT_NUMBER,
2201             .help = "I/O operations read burst",
2202         },{
2203             .name = "throttling.iops-write-max",
2204             .type = QEMU_OPT_NUMBER,
2205             .help = "I/O operations write burst",
2206         },{
2207             .name = "throttling.bps-total-max",
2208             .type = QEMU_OPT_NUMBER,
2209             .help = "total bytes burst",
2210         },{
2211             .name = "throttling.bps-read-max",
2212             .type = QEMU_OPT_NUMBER,
2213             .help = "total bytes read burst",
2214         },{
2215             .name = "throttling.bps-write-max",
2216             .type = QEMU_OPT_NUMBER,
2217             .help = "total bytes write burst",
2218         },{
2219             .name = "throttling.iops-size",
2220             .type = QEMU_OPT_NUMBER,
2221             .help = "when limiting by iops max size of an I/O in bytes",
2222         },{
2223             .name = "copy-on-read",
2224             .type = QEMU_OPT_BOOL,
2225             .help = "copy read data from backing file into image file",
2226         },{
2227             .name = "boot",
2228             .type = QEMU_OPT_BOOL,
2229             .help = "(deprecated, ignored)",
2230         },
2231         { /* end of list */ }
2232     },
2233 };
2234
2235 QemuOptsList qemu_drive_opts = {
2236     .name = "drive",
2237     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2238     .desc = {
2239         /*
2240          * no elements => accept any params
2241          * validation will happen later
2242          */
2243         { /* end of list */ }
2244     },
2245 };