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 "qemu/option.h"
  38 #include "qemu/config-file.h"
  39 #include "qapi/qmp/types.h"
  40 #include "qapi-visit.h"
  41 #include "qapi/qmp-output-visitor.h"
  42 #include "sysemu/sysemu.h"
  43 #include "block/block_int.h"
  44 #include "qmp-commands.h"
  45 #include "trace.h"
  46 #include "sysemu/arch_init.h"
  47
  48 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  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 (dinfo && !dinfo->enable_auto_del) {
  93         return;
  94     }
  95
  96     if (bs->job) {
  97         block_job_cancel(bs->job);
  98     }
  99     if (dinfo) {
 100         dinfo->auto_del = 1;
 101     }
 102 }
 103
 104 void blockdev_auto_del(BlockDriverState *bs)
 105 {
 106     DriveInfo *dinfo = drive_get_by_blockdev(bs);
 107
 108     if (dinfo && dinfo->auto_del) {
 109         drive_del(dinfo);
 110     }
 111 }
 112
 113 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
 114 {
 115     int max_devs = if_max_devs[type];
 116     return max_devs ? index / max_devs : 0;
 117 }
 118
 119 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
 120 {
 121     int max_devs = if_max_devs[type];
 122     return max_devs ? index % max_devs : index;
 123 }
 124
 125 QemuOpts *drive_def(const char *optstr)
 126 {
 127     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
 128 }
 129
 130 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 131                     const char *optstr)
 132 {
 133     QemuOpts *opts;
 134     char buf[32];
 135
 136     opts = drive_def(optstr);
 137     if (!opts) {
 138         return NULL;
 139     }
 140     if (type != IF_DEFAULT) {
 141         qemu_opt_set(opts, "if", if_name[type]);
 142     }
 143     if (index >= 0) {
 144         snprintf(buf, sizeof(buf), "%d", index);
 145         qemu_opt_set(opts, "index", buf);
 146     }
 147     if (file)
 148         qemu_opt_set(opts, "file", file);
 149     return opts;
 150 }
 151
 152 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 153 {
 154     DriveInfo *dinfo;
 155
 156     /* seek interface, bus and unit */
 157
 158     QTAILQ_FOREACH(dinfo, &drives, next) {
 159         if (dinfo->type == type &&
 160             dinfo->bus == bus &&
 161             dinfo->unit == unit)
 162             return dinfo;
 163     }
 164
 165     return NULL;
 166 }
 167
 168 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 169 {
 170     return drive_get(type,
 171                      drive_index_to_bus_id(type, index),
 172                      drive_index_to_unit_id(type, index));
 173 }
 174
 175 int drive_get_max_bus(BlockInterfaceType type)
 176 {
 177     int max_bus;
 178     DriveInfo *dinfo;
 179
 180     max_bus = -1;
 181     QTAILQ_FOREACH(dinfo, &drives, next) {
 182         if(dinfo->type == type &&
 183            dinfo->bus > max_bus)
 184             max_bus = dinfo->bus;
 185     }
 186     return max_bus;
 187 }
 188
 189 /* Get a block device.  This should only be used for single-drive devices
 190    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 191    appropriate bus.  */
 192 DriveInfo *drive_get_next(BlockInterfaceType type)
 193 {
 194     static int next_block_unit[IF_COUNT];
 195
 196     return drive_get(type, 0, next_block_unit[type]++);
 197 }
 198
 199 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 200 {
 201     DriveInfo *dinfo;
 202
 203     QTAILQ_FOREACH(dinfo, &drives, next) {
 204         if (dinfo->bdrv == bs) {
 205             return dinfo;
 206         }
 207     }
 208     return NULL;
 209 }
 210
 211 static void bdrv_format_print(void *opaque, const char *name)
 212 {
 213     error_printf(" %s", name);
 214 }
 215
 216 void drive_del(DriveInfo *dinfo)
 217 {
 218     if (dinfo->opts) {
 219         qemu_opts_del(dinfo->opts);
 220     }
 221
 222     bdrv_unref(dinfo->bdrv);
 223     g_free(dinfo->id);
 224     QTAILQ_REMOVE(&drives, dinfo, next);
 225     g_free(dinfo->serial);
 226     g_free(dinfo);
 227 }
 228
 229 typedef struct {
 230     QEMUBH *bh;
 231     BlockDriverState *bs;
 232 } BDRVPutRefBH;
 233
 234 static void bdrv_put_ref_bh(void *opaque)
 235 {
 236     BDRVPutRefBH *s = opaque;
 237
 238     bdrv_unref(s->bs);
 239     qemu_bh_delete(s->bh);
 240     g_free(s);
 241 }
 242
 243 /*
 244  * Release a BDS reference in a BH
 245  *
 246  * It is not safe to use bdrv_unref() from a callback function when the callers
 247  * still need the BlockDriverState.  In such cases we schedule a BH to release
 248  * the reference.
 249  */
 250 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
 251 {
 252     BDRVPutRefBH *s;
 253
 254     s = g_new(BDRVPutRefBH, 1);
 255     s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
 256     s->bs = bs;
 257     qemu_bh_schedule(s->bh);
 258 }
 259
 260 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
 261 {
 262     if (!strcmp(buf, "ignore")) {
 263         return BLOCKDEV_ON_ERROR_IGNORE;
 264     } else if (!is_read && !strcmp(buf, "enospc")) {
 265         return BLOCKDEV_ON_ERROR_ENOSPC;
 266     } else if (!strcmp(buf, "stop")) {
 267         return BLOCKDEV_ON_ERROR_STOP;
 268     } else if (!strcmp(buf, "report")) {
 269         return BLOCKDEV_ON_ERROR_REPORT;
 270     } else {
 271         error_setg(errp, "'%s' invalid %s error action",
 272                    buf, is_read ? "read" : "write");
 273         return -1;
 274     }
 275 }
 276
 277 static inline int parse_enum_option(const char *lookup[], const char *buf,
 278                                     int max, int def, Error **errp)
 279 {
 280     int i;
 281
 282     if (!buf) {
 283         return def;
 284     }
 285
 286     for (i = 0; i < max; i++) {
 287         if (!strcmp(buf, lookup[i])) {
 288             return i;
 289         }
 290     }
 291
 292     error_setg(errp, "invalid parameter value: %s", buf);
 293     return def;
 294 }
 295
 296 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
 297 {
 298     if (throttle_conflicting(cfg)) {
 299         error_setg(errp, "bps/iops/max total values and read/write values"
 300                          " cannot be used at the same time");
 301         return false;
 302     }
 303
 304     if (!throttle_is_valid(cfg)) {
 305         error_setg(errp, "bps/iops/maxs values must be 0 or greater");
 306         return false;
 307     }
 308
 309     return true;
 310 }
 311
 312 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
 313
 314 /* Takes the ownership of bs_opts */
 315 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
 316                                 Error **errp)
 317 {
 318     const char *buf;
 319     int ro = 0;
 320     int bdrv_flags = 0;
 321     int on_read_error, on_write_error;
 322     DriveInfo *dinfo;
 323     ThrottleConfig cfg;
 324     int snapshot = 0;
 325     bool copy_on_read;
 326     int ret;
 327     Error *error = NULL;
 328     QemuOpts *opts;
 329     const char *id;
 330     bool has_driver_specific_opts;
 331     BlockdevDetectZeroesOptions detect_zeroes;
 332     BlockDriver *drv = NULL;
 333
 334     /* Check common options by copying from bs_opts to opts, all other options
 335      * stay in bs_opts for processing by bdrv_open(). */
 336     id = qdict_get_try_str(bs_opts, "id");
 337     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
 338     if (error) {
 339         error_propagate(errp, error);
 340         goto err_no_opts;
 341     }
 342
 343     qemu_opts_absorb_qdict(opts, bs_opts, &error);
 344     if (error) {
 345         error_propagate(errp, error);
 346         goto early_err;
 347     }
 348
 349     if (id) {
 350         qdict_del(bs_opts, "id");
 351     }
 352
 353     has_driver_specific_opts = !!qdict_size(bs_opts);
 354
 355     /* extract parameters */
 356     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 357     ro = qemu_opt_get_bool(opts, "read-only", 0);
 358     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 359
 360     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
 361         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
 362             error_setg(errp, "invalid discard option");
 363             goto early_err;
 364         }
 365     }
 366
 367     if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
 368         bdrv_flags |= BDRV_O_CACHE_WB;
 369     }
 370     if (qemu_opt_get_bool(opts, "cache.direct", false)) {
 371         bdrv_flags |= BDRV_O_NOCACHE;
 372     }
 373     if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
 374         bdrv_flags |= BDRV_O_NO_FLUSH;
 375     }
 376
 377 #ifdef CONFIG_LINUX_AIO
 378     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 379         if (!strcmp(buf, "native")) {
 380             bdrv_flags |= BDRV_O_NATIVE_AIO;
 381         } else if (!strcmp(buf, "threads")) {
 382             /* this is the default */
 383         } else {
 384            error_setg(errp, "invalid aio option");
 385            goto early_err;
 386         }
 387     }
 388 #endif
 389
 390     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 391         if (is_help_option(buf)) {
 392             error_printf("Supported formats:");
 393             bdrv_iterate_format(bdrv_format_print, NULL);
 394             error_printf("\n");
 395             goto early_err;
 396         }
 397
 398         drv = bdrv_find_format(buf);
 399         if (!drv) {
 400             error_setg(errp, "'%s' invalid format", buf);
 401             goto early_err;
 402         }
 403     }
 404
 405     /* disk I/O throttling */
 406     memset(&cfg, 0, sizeof(cfg));
 407     cfg.buckets[THROTTLE_BPS_TOTAL].avg =
 408         qemu_opt_get_number(opts, "throttling.bps-total", 0);
 409     cfg.buckets[THROTTLE_BPS_READ].avg  =
 410         qemu_opt_get_number(opts, "throttling.bps-read", 0);
 411     cfg.buckets[THROTTLE_BPS_WRITE].avg =
 412         qemu_opt_get_number(opts, "throttling.bps-write", 0);
 413     cfg.buckets[THROTTLE_OPS_TOTAL].avg =
 414         qemu_opt_get_number(opts, "throttling.iops-total", 0);
 415     cfg.buckets[THROTTLE_OPS_READ].avg =
 416         qemu_opt_get_number(opts, "throttling.iops-read", 0);
 417     cfg.buckets[THROTTLE_OPS_WRITE].avg =
 418         qemu_opt_get_number(opts, "throttling.iops-write", 0);
 419
 420     cfg.buckets[THROTTLE_BPS_TOTAL].max =
 421         qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
 422     cfg.buckets[THROTTLE_BPS_READ].max  =
 423         qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
 424     cfg.buckets[THROTTLE_BPS_WRITE].max =
 425         qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
 426     cfg.buckets[THROTTLE_OPS_TOTAL].max =
 427         qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
 428     cfg.buckets[THROTTLE_OPS_READ].max =
 429         qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
 430     cfg.buckets[THROTTLE_OPS_WRITE].max =
 431         qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
 432
 433     cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
 434
 435     if (!check_throttle_config(&cfg, &error)) {
 436         error_propagate(errp, error);
 437         goto early_err;
 438     }
 439
 440     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 441     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 442         on_write_error = parse_block_error_action(buf, 0, &error);
 443         if (error) {
 444             error_propagate(errp, error);
 445             goto early_err;
 446         }
 447     }
 448
 449     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 450     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 451         on_read_error = parse_block_error_action(buf, 1, &error);
 452         if (error) {
 453             error_propagate(errp, error);
 454             goto early_err;
 455         }
 456     }
 457
 458     detect_zeroes =
 459         parse_enum_option(BlockdevDetectZeroesOptions_lookup,
 460                           qemu_opt_get(opts, "detect-zeroes"),
 461                           BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
 462                           BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
 463                           &error);
 464     if (error) {
 465         error_propagate(errp, error);
 466         goto early_err;
 467     }
 468
 469     if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
 470         !(bdrv_flags & BDRV_O_UNMAP)) {
 471         error_setg(errp, "setting detect-zeroes to unmap is not allowed "
 472                          "without setting discard operation to unmap");
 473         goto early_err;
 474     }
 475
 476     /* init */
 477     dinfo = g_malloc0(sizeof(*dinfo));
 478     dinfo->id = g_strdup(qemu_opts_id(opts));
 479     dinfo->bdrv = bdrv_new(dinfo->id, &error);
 480     if (error) {
 481         error_propagate(errp, error);
 482         goto bdrv_new_err;
 483     }
 484     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 485     dinfo->bdrv->read_only = ro;
 486     dinfo->bdrv->detect_zeroes = detect_zeroes;
 487     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 488
 489     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 490
 491     /* disk I/O throttling */
 492     if (throttle_enabled(&cfg)) {
 493         bdrv_io_limits_enable(dinfo->bdrv);
 494         bdrv_set_io_limits(dinfo->bdrv, &cfg);
 495     }
 496
 497     if (!file || !*file) {
 498         if (has_driver_specific_opts) {
 499             file = NULL;
 500         } else {
 501             QDECREF(bs_opts);
 502             qemu_opts_del(opts);
 503             return dinfo;
 504         }
 505     }
 506     if (snapshot) {
 507         /* always use cache=unsafe with snapshot */
 508         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 509         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 510     }
 511
 512     if (copy_on_read) {
 513         bdrv_flags |= BDRV_O_COPY_ON_READ;
 514     }
 515
 516     if (runstate_check(RUN_STATE_INMIGRATE)) {
 517         bdrv_flags |= BDRV_O_INCOMING;
 518     }
 519
 520     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 521
 522     QINCREF(bs_opts);
 523     ret = bdrv_open(&dinfo->bdrv, file, NULL, bs_opts, bdrv_flags, drv, &error);
 524
 525     if (ret < 0) {
 526         error_setg(errp, "could not open disk image %s: %s",
 527                    file ?: dinfo->id, error_get_pretty(error));
 528         error_free(error);
 529         goto err;
 530     }
 531
 532     if (bdrv_key_required(dinfo->bdrv))
 533         autostart = 0;
 534
 535     QDECREF(bs_opts);
 536     qemu_opts_del(opts);
 537
 538     return dinfo;
 539
 540 err:
 541     bdrv_unref(dinfo->bdrv);
 542     QTAILQ_REMOVE(&drives, dinfo, next);
 543 bdrv_new_err:
 544     g_free(dinfo->id);
 545     g_free(dinfo);
 546 early_err:
 547     qemu_opts_del(opts);
 548 err_no_opts:
 549     QDECREF(bs_opts);
 550     return NULL;
 551 }
 552
 553 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
 554 {
 555     const char *value;
 556
 557     value = qemu_opt_get(opts, from);
 558     if (value) {
 559         qemu_opt_set(opts, to, value);
 560         qemu_opt_unset(opts, from);
 561     }
 562 }
 563
 564 QemuOptsList qemu_legacy_drive_opts = {
 565     .name = "drive",
 566     .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
 567     .desc = {
 568         {
 569             .name = "bus",
 570             .type = QEMU_OPT_NUMBER,
 571             .help = "bus number",
 572         },{
 573             .name = "unit",
 574             .type = QEMU_OPT_NUMBER,
 575             .help = "unit number (i.e. lun for scsi)",
 576         },{
 577             .name = "index",
 578             .type = QEMU_OPT_NUMBER,
 579             .help = "index number",
 580         },{
 581             .name = "media",
 582             .type = QEMU_OPT_STRING,
 583             .help = "media type (disk, cdrom)",
 584         },{
 585             .name = "if",
 586             .type = QEMU_OPT_STRING,
 587             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
 588         },{
 589             .name = "cyls",
 590             .type = QEMU_OPT_NUMBER,
 591             .help = "number of cylinders (ide disk geometry)",
 592         },{
 593             .name = "heads",
 594             .type = QEMU_OPT_NUMBER,
 595             .help = "number of heads (ide disk geometry)",
 596         },{
 597             .name = "secs",
 598             .type = QEMU_OPT_NUMBER,
 599             .help = "number of sectors (ide disk geometry)",
 600         },{
 601             .name = "trans",
 602             .type = QEMU_OPT_STRING,
 603             .help = "chs translation (auto, lba, none)",
 604         },{
 605             .name = "boot",
 606             .type = QEMU_OPT_BOOL,
 607             .help = "(deprecated, ignored)",
 608         },{
 609             .name = "addr",
 610             .type = QEMU_OPT_STRING,
 611             .help = "pci address (virtio only)",
 612         },{
 613             .name = "serial",
 614             .type = QEMU_OPT_STRING,
 615             .help = "disk serial number",
 616         },{
 617             .name = "file",
 618             .type = QEMU_OPT_STRING,
 619             .help = "file name",
 620         },
 621
 622         /* Options that are passed on, but have special semantics with -drive */
 623         {
 624             .name = "read-only",
 625             .type = QEMU_OPT_BOOL,
 626             .help = "open drive file as read-only",
 627         },{
 628             .name = "rerror",
 629             .type = QEMU_OPT_STRING,
 630             .help = "read error action",
 631         },{
 632             .name = "werror",
 633             .type = QEMU_OPT_STRING,
 634             .help = "write error action",
 635         },{
 636             .name = "copy-on-read",
 637             .type = QEMU_OPT_BOOL,
 638             .help = "copy read data from backing file into image file",
 639         },
 640
 641         { /* end of list */ }
 642     },
 643 };
 644
 645 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 646 {
 647     const char *value;
 648     DriveInfo *dinfo = NULL;
 649     QDict *bs_opts;
 650     QemuOpts *legacy_opts;
 651     DriveMediaType media = MEDIA_DISK;
 652     BlockInterfaceType type;
 653     int cyls, heads, secs, translation;
 654     int max_devs, bus_id, unit_id, index;
 655     const char *devaddr;
 656     const char *werror, *rerror;
 657     bool read_only = false;
 658     bool copy_on_read;
 659     const char *serial;
 660     const char *filename;
 661     Error *local_err = NULL;
 662
 663     /* Change legacy command line options into QMP ones */
 664     qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
 665     qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
 666     qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
 667
 668     qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
 669     qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
 670     qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
 671
 672     qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
 673     qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
 674     qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
 675
 676     qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
 677     qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
 678     qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
 679
 680     qemu_opt_rename(all_opts,
 681                     "iops_size", "throttling.iops-size");
 682
 683     qemu_opt_rename(all_opts, "readonly", "read-only");
 684
 685     value = qemu_opt_get(all_opts, "cache");
 686     if (value) {
 687         int flags = 0;
 688
 689         if (bdrv_parse_cache_flags(value, &flags) != 0) {
 690             error_report("invalid cache option");
 691             return NULL;
 692         }
 693
 694         /* Specific options take precedence */
 695         if (!qemu_opt_get(all_opts, "cache.writeback")) {
 696             qemu_opt_set_bool(all_opts, "cache.writeback",
 697                               !!(flags & BDRV_O_CACHE_WB));
 698         }
 699         if (!qemu_opt_get(all_opts, "cache.direct")) {
 700             qemu_opt_set_bool(all_opts, "cache.direct",
 701                               !!(flags & BDRV_O_NOCACHE));
 702         }
 703         if (!qemu_opt_get(all_opts, "cache.no-flush")) {
 704             qemu_opt_set_bool(all_opts, "cache.no-flush",
 705                               !!(flags & BDRV_O_NO_FLUSH));
 706         }
 707         qemu_opt_unset(all_opts, "cache");
 708     }
 709
 710     /* Get a QDict for processing the options */
 711     bs_opts = qdict_new();
 712     qemu_opts_to_qdict(all_opts, bs_opts);
 713
 714     legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
 715                                    &error_abort);
 716     qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
 717     if (local_err) {
 718         error_report("%s", error_get_pretty(local_err));
 719         error_free(local_err);
 720         goto fail;
 721     }
 722
 723     /* Deprecated option boot=[on|off] */
 724     if (qemu_opt_get(legacy_opts, "boot") != NULL) {
 725         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 726                 "ignored. Future versions will reject this parameter. Please "
 727                 "update your scripts.\n");
 728     }
 729
 730     /* Media type */
 731     value = qemu_opt_get(legacy_opts, "media");
 732     if (value) {
 733         if (!strcmp(value, "disk")) {
 734             media = MEDIA_DISK;
 735         } else if (!strcmp(value, "cdrom")) {
 736             media = MEDIA_CDROM;
 737             read_only = true;
 738         } else {
 739             error_report("'%s' invalid media", value);
 740             goto fail;
 741         }
 742     }
 743
 744     /* copy-on-read is disabled with a warning for read-only devices */
 745     read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
 746     copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
 747
 748     if (read_only && copy_on_read) {
 749         error_report("warning: disabling copy-on-read on read-only drive");
 750         copy_on_read = false;
 751     }
 752
 753     qdict_put(bs_opts, "read-only",
 754               qstring_from_str(read_only ? "on" : "off"));
 755     qdict_put(bs_opts, "copy-on-read",
 756               qstring_from_str(copy_on_read ? "on" :"off"));
 757
 758     /* Controller type */
 759     value = qemu_opt_get(legacy_opts, "if");
 760     if (value) {
 761         for (type = 0;
 762              type < IF_COUNT && strcmp(value, if_name[type]);
 763              type++) {
 764         }
 765         if (type == IF_COUNT) {
 766             error_report("unsupported bus type '%s'", value);
 767             goto fail;
 768         }
 769     } else {
 770         type = block_default_type;
 771     }
 772
 773     /* Geometry */
 774     cyls  = qemu_opt_get_number(legacy_opts, "cyls", 0);
 775     heads = qemu_opt_get_number(legacy_opts, "heads", 0);
 776     secs  = qemu_opt_get_number(legacy_opts, "secs", 0);
 777
 778     if (cyls || heads || secs) {
 779         if (cyls < 1) {
 780             error_report("invalid physical cyls number");
 781             goto fail;
 782         }
 783         if (heads < 1) {
 784             error_report("invalid physical heads number");
 785             goto fail;
 786         }
 787         if (secs < 1) {
 788             error_report("invalid physical secs number");
 789             goto fail;
 790         }
 791     }
 792
 793     translation = BIOS_ATA_TRANSLATION_AUTO;
 794     value = qemu_opt_get(legacy_opts, "trans");
 795     if (value != NULL) {
 796         if (!cyls) {
 797             error_report("'%s' trans must be used with cyls, heads and secs",
 798                          value);
 799             goto fail;
 800         }
 801         if (!strcmp(value, "none")) {
 802             translation = BIOS_ATA_TRANSLATION_NONE;
 803         } else if (!strcmp(value, "lba")) {
 804             translation = BIOS_ATA_TRANSLATION_LBA;
 805         } else if (!strcmp(value, "large")) {
 806             translation = BIOS_ATA_TRANSLATION_LARGE;
 807         } else if (!strcmp(value, "rechs")) {
 808             translation = BIOS_ATA_TRANSLATION_RECHS;
 809         } else if (!strcmp(value, "auto")) {
 810             translation = BIOS_ATA_TRANSLATION_AUTO;
 811         } else {
 812             error_report("'%s' invalid translation type", value);
 813             goto fail;
 814         }
 815     }
 816
 817     if (media == MEDIA_CDROM) {
 818         if (cyls || secs || heads) {
 819             error_report("CHS can't be set with media=cdrom");
 820             goto fail;
 821         }
 822     }
 823
 824     /* Device address specified by bus/unit or index.
 825      * If none was specified, try to find the first free one. */
 826     bus_id  = qemu_opt_get_number(legacy_opts, "bus", 0);
 827     unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
 828     index   = qemu_opt_get_number(legacy_opts, "index", -1);
 829
 830     max_devs = if_max_devs[type];
 831
 832     if (index != -1) {
 833         if (bus_id != 0 || unit_id != -1) {
 834             error_report("index cannot be used with bus and unit");
 835             goto fail;
 836         }
 837         bus_id = drive_index_to_bus_id(type, index);
 838         unit_id = drive_index_to_unit_id(type, index);
 839     }
 840
 841     if (unit_id == -1) {
 842        unit_id = 0;
 843        while (drive_get(type, bus_id, unit_id) != NULL) {
 844            unit_id++;
 845            if (max_devs && unit_id >= max_devs) {
 846                unit_id -= max_devs;
 847                bus_id++;
 848            }
 849        }
 850     }
 851
 852     if (max_devs && unit_id >= max_devs) {
 853         error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
 854         goto fail;
 855     }
 856
 857     if (drive_get(type, bus_id, unit_id) != NULL) {
 858         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 859                      bus_id, unit_id, index);
 860         goto fail;
 861     }
 862
 863     /* Serial number */
 864     serial = qemu_opt_get(legacy_opts, "serial");
 865
 866     /* no id supplied -> create one */
 867     if (qemu_opts_id(all_opts) == NULL) {
 868         char *new_id;
 869         const char *mediastr = "";
 870         if (type == IF_IDE || type == IF_SCSI) {
 871             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 872         }
 873         if (max_devs) {
 874             new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
 875                                      mediastr, unit_id);
 876         } else {
 877             new_id = g_strdup_printf("%s%s%i", if_name[type],
 878                                      mediastr, unit_id);
 879         }
 880         qdict_put(bs_opts, "id", qstring_from_str(new_id));
 881         g_free(new_id);
 882     }
 883
 884     /* Add virtio block device */
 885     devaddr = qemu_opt_get(legacy_opts, "addr");
 886     if (devaddr && type != IF_VIRTIO) {
 887         error_report("addr is not supported by this bus type");
 888         goto fail;
 889     }
 890
 891     if (type == IF_VIRTIO) {
 892         QemuOpts *devopts;
 893         devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
 894                                    &error_abort);
 895         if (arch_type == QEMU_ARCH_S390X) {
 896             qemu_opt_set(devopts, "driver", "virtio-blk-s390");
 897         } else {
 898             qemu_opt_set(devopts, "driver", "virtio-blk-pci");
 899         }
 900         qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
 901         if (devaddr) {
 902             qemu_opt_set(devopts, "addr", devaddr);
 903         }
 904     }
 905
 906     filename = qemu_opt_get(legacy_opts, "file");
 907
 908     /* Check werror/rerror compatibility with if=... */
 909     werror = qemu_opt_get(legacy_opts, "werror");
 910     if (werror != NULL) {
 911         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
 912             type != IF_NONE) {
 913             error_report("werror is not supported by this bus type");
 914             goto fail;
 915         }
 916         qdict_put(bs_opts, "werror", qstring_from_str(werror));
 917     }
 918
 919     rerror = qemu_opt_get(legacy_opts, "rerror");
 920     if (rerror != NULL) {
 921         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
 922             type != IF_NONE) {
 923             error_report("rerror is not supported by this bus type");
 924             goto fail;
 925         }
 926         qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
 927     }
 928
 929     /* Actual block device init: Functionality shared with blockdev-add */
 930     dinfo = blockdev_init(filename, bs_opts, &local_err);
 931     bs_opts = NULL;
 932     if (dinfo == NULL) {
 933         if (local_err) {
 934             error_report("%s", error_get_pretty(local_err));
 935             error_free(local_err);
 936         }
 937         goto fail;
 938     } else {
 939         assert(!local_err);
 940     }
 941
 942     /* Set legacy DriveInfo fields */
 943     dinfo->enable_auto_del = true;
 944     dinfo->opts = all_opts;
 945
 946     dinfo->cyls = cyls;
 947     dinfo->heads = heads;
 948     dinfo->secs = secs;
 949     dinfo->trans = translation;
 950
 951     dinfo->type = type;
 952     dinfo->bus = bus_id;
 953     dinfo->unit = unit_id;
 954     dinfo->devaddr = devaddr;
 955
 956     dinfo->serial = g_strdup(serial);
 957
 958     switch(type) {
 959     case IF_IDE:
 960     case IF_SCSI:
 961     case IF_XEN:
 962     case IF_NONE:
 963         dinfo->media_cd = media == MEDIA_CDROM;
 964         break;
 965     default:
 966         break;
 967     }
 968
 969 fail:
 970     qemu_opts_del(legacy_opts);
 971     QDECREF(bs_opts);
 972     return dinfo;
 973 }
 974
 975 void do_commit(Monitor *mon, const QDict *qdict)
 976 {
 977     const char *device = qdict_get_str(qdict, "device");
 978     BlockDriverState *bs;
 979     int ret;
 980
 981     if (!strcmp(device, "all")) {
 982         ret = bdrv_commit_all();
 983     } else {
 984         bs = bdrv_find(device);
 985         if (!bs) {
 986             monitor_printf(mon, "Device '%s' not found\n", device);
 987             return;
 988         }
 989         ret = bdrv_commit(bs);
 990     }
 991     if (ret < 0) {
 992         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 993                        strerror(-ret));
 994     }
 995 }
 996
 997 static void blockdev_do_action(int kind, void *data, Error **errp)
 998 {
 999     TransactionAction action;
1000     TransactionActionList list;
1001
1002     action.kind = kind;
1003     action.data = data;
1004     list.value = &action;
1005     list.next = NULL;
1006     qmp_transaction(&list, errp);
1007 }
1008
1009 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1010                                 bool has_node_name, const char *node_name,
1011                                 const char *snapshot_file,
1012                                 bool has_snapshot_node_name,
1013                                 const char *snapshot_node_name,
1014                                 bool has_format, const char *format,
1015                                 bool has_mode, NewImageMode mode, Error **errp)
1016 {
1017     BlockdevSnapshot snapshot = {
1018         .has_device = has_device,
1019         .device = (char *) device,
1020         .has_node_name = has_node_name,
1021         .node_name = (char *) node_name,
1022         .snapshot_file = (char *) snapshot_file,
1023         .has_snapshot_node_name = has_snapshot_node_name,
1024         .snapshot_node_name = (char *) snapshot_node_name,
1025         .has_format = has_format,
1026         .format = (char *) format,
1027         .has_mode = has_mode,
1028         .mode = mode,
1029     };
1030     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1031                        &snapshot, errp);
1032 }
1033
1034 void qmp_blockdev_snapshot_internal_sync(const char *device,
1035                                          const char *name,
1036                                          Error **errp)
1037 {
1038     BlockdevSnapshotInternal snapshot = {
1039         .device = (char *) device,
1040         .name = (char *) name
1041     };
1042
1043     blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1044                        &snapshot, errp);
1045 }
1046
1047 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1048                                                          bool has_id,
1049                                                          const char *id,
1050                                                          bool has_name,
1051                                                          const char *name,
1052                                                          Error **errp)
1053 {
1054     BlockDriverState *bs = bdrv_find(device);
1055     QEMUSnapshotInfo sn;
1056     Error *local_err = NULL;
1057     SnapshotInfo *info = NULL;
1058     int ret;
1059
1060     if (!bs) {
1061         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1062         return NULL;
1063     }
1064
1065     if (!has_id) {
1066         id = NULL;
1067     }
1068
1069     if (!has_name) {
1070         name = NULL;
1071     }
1072
1073     if (!id && !name) {
1074         error_setg(errp, "Name or id must be provided");
1075         return NULL;
1076     }
1077
1078     ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1079     if (local_err) {
1080         error_propagate(errp, local_err);
1081         return NULL;
1082     }
1083     if (!ret) {
1084         error_setg(errp,
1085                    "Snapshot with id '%s' and name '%s' does not exist on "
1086                    "device '%s'",
1087                    STR_OR_NULL(id), STR_OR_NULL(name), device);
1088         return NULL;
1089     }
1090
1091     bdrv_snapshot_delete(bs, id, name, &local_err);
1092     if (local_err) {
1093         error_propagate(errp, local_err);
1094         return NULL;
1095     }
1096
1097     info = g_malloc0(sizeof(SnapshotInfo));
1098     info->id = g_strdup(sn.id_str);
1099     info->name = g_strdup(sn.name);
1100     info->date_nsec = sn.date_nsec;
1101     info->date_sec = sn.date_sec;
1102     info->vm_state_size = sn.vm_state_size;
1103     info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1104     info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1105
1106     return info;
1107 }
1108
1109 /* New and old BlockDriverState structs for group snapshots */
1110
1111 typedef struct BlkTransactionState BlkTransactionState;
1112
1113 /* Only prepare() may fail. In a single transaction, only one of commit() or
1114    abort() will be called, clean() will always be called if it present. */
1115 typedef struct BdrvActionOps {
1116     /* Size of state struct, in bytes. */
1117     size_t instance_size;
1118     /* Prepare the work, must NOT be NULL. */
1119     void (*prepare)(BlkTransactionState *common, Error **errp);
1120     /* Commit the changes, can be NULL. */
1121     void (*commit)(BlkTransactionState *common);
1122     /* Abort the changes on fail, can be NULL. */
1123     void (*abort)(BlkTransactionState *common);
1124     /* Clean up resource in the end, can be NULL. */
1125     void (*clean)(BlkTransactionState *common);
1126 } BdrvActionOps;
1127
1128 /*
1129  * This structure must be arranged as first member in child type, assuming
1130  * that compiler will also arrange it to the same address with parent instance.
1131  * Later it will be used in free().
1132  */
1133 struct BlkTransactionState {
1134     TransactionAction *action;
1135     const BdrvActionOps *ops;
1136     QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1137 };
1138
1139 /* internal snapshot private data */
1140 typedef struct InternalSnapshotState {
1141     BlkTransactionState common;
1142     BlockDriverState *bs;
1143     QEMUSnapshotInfo sn;
1144 } InternalSnapshotState;
1145
1146 static void internal_snapshot_prepare(BlkTransactionState *common,
1147                                       Error **errp)
1148 {
1149     Error *local_err = NULL;
1150     const char *device;
1151     const char *name;
1152     BlockDriverState *bs;
1153     QEMUSnapshotInfo old_sn, *sn;
1154     bool ret;
1155     qemu_timeval tv;
1156     BlockdevSnapshotInternal *internal;
1157     InternalSnapshotState *state;
1158     int ret1;
1159
1160     g_assert(common->action->kind ==
1161              TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1162     internal = common->action->blockdev_snapshot_internal_sync;
1163     state = DO_UPCAST(InternalSnapshotState, common, common);
1164
1165     /* 1. parse input */
1166     device = internal->device;
1167     name = internal->name;
1168
1169     /* 2. check for validation */
1170     bs = bdrv_find(device);
1171     if (!bs) {
1172         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1173         return;
1174     }
1175
1176     if (!bdrv_is_inserted(bs)) {
1177         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1178         return;
1179     }
1180
1181     if (bdrv_is_read_only(bs)) {
1182         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1183         return;
1184     }
1185
1186     if (!bdrv_can_snapshot(bs)) {
1187         error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1188                   bs->drv->format_name, device, "internal snapshot");
1189         return;
1190     }
1191
1192     if (!strlen(name)) {
1193         error_setg(errp, "Name is empty");
1194         return;
1195     }
1196
1197     /* check whether a snapshot with name exist */
1198     ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1199                                             &local_err);
1200     if (local_err) {
1201         error_propagate(errp, local_err);
1202         return;
1203     } else if (ret) {
1204         error_setg(errp,
1205                    "Snapshot with name '%s' already exists on device '%s'",
1206                    name, device);
1207         return;
1208     }
1209
1210     /* 3. take the snapshot */
1211     sn = &state->sn;
1212     pstrcpy(sn->name, sizeof(sn->name), name);
1213     qemu_gettimeofday(&tv);
1214     sn->date_sec = tv.tv_sec;
1215     sn->date_nsec = tv.tv_usec * 1000;
1216     sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1217
1218     ret1 = bdrv_snapshot_create(bs, sn);
1219     if (ret1 < 0) {
1220         error_setg_errno(errp, -ret1,
1221                          "Failed to create snapshot '%s' on device '%s'",
1222                          name, device);
1223         return;
1224     }
1225
1226     /* 4. succeed, mark a snapshot is created */
1227     state->bs = bs;
1228 }
1229
1230 static void internal_snapshot_abort(BlkTransactionState *common)
1231 {
1232     InternalSnapshotState *state =
1233                              DO_UPCAST(InternalSnapshotState, common, common);
1234     BlockDriverState *bs = state->bs;
1235     QEMUSnapshotInfo *sn = &state->sn;
1236     Error *local_error = NULL;
1237
1238     if (!bs) {
1239         return;
1240     }
1241
1242     if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1243         error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1244                      "device '%s' in abort: %s",
1245                      sn->id_str,
1246                      sn->name,
1247                      bdrv_get_device_name(bs),
1248                      error_get_pretty(local_error));
1249         error_free(local_error);
1250     }
1251 }
1252
1253 /* external snapshot private data */
1254 typedef struct ExternalSnapshotState {
1255     BlkTransactionState common;
1256     BlockDriverState *old_bs;
1257     BlockDriverState *new_bs;
1258 } ExternalSnapshotState;
1259
1260 static void external_snapshot_prepare(BlkTransactionState *common,
1261                                       Error **errp)
1262 {
1263     BlockDriver *drv;
1264     int flags, ret;
1265     QDict *options = NULL;
1266     Error *local_err = NULL;
1267     bool has_device = false;
1268     const char *device;
1269     bool has_node_name = false;
1270     const char *node_name;
1271     bool has_snapshot_node_name = false;
1272     const char *snapshot_node_name;
1273     const char *new_image_file;
1274     const char *format = "qcow2";
1275     enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1276     ExternalSnapshotState *state =
1277                              DO_UPCAST(ExternalSnapshotState, common, common);
1278     TransactionAction *action = common->action;
1279
1280     /* get parameters */
1281     g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1282
1283     has_device = action->blockdev_snapshot_sync->has_device;
1284     device = action->blockdev_snapshot_sync->device;
1285     has_node_name = action->blockdev_snapshot_sync->has_node_name;
1286     node_name = action->blockdev_snapshot_sync->node_name;
1287     has_snapshot_node_name =
1288         action->blockdev_snapshot_sync->has_snapshot_node_name;
1289     snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1290
1291     new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1292     if (action->blockdev_snapshot_sync->has_format) {
1293         format = action->blockdev_snapshot_sync->format;
1294     }
1295     if (action->blockdev_snapshot_sync->has_mode) {
1296         mode = action->blockdev_snapshot_sync->mode;
1297     }
1298
1299     /* start processing */
1300     drv = bdrv_find_format(format);
1301     if (!drv) {
1302         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1303         return;
1304     }
1305
1306     state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1307                                    has_node_name ? node_name : NULL,
1308                                    &local_err);
1309     if (local_err) {
1310         error_propagate(errp, local_err);
1311         return;
1312     }
1313
1314     if (has_node_name && !has_snapshot_node_name) {
1315         error_setg(errp, "New snapshot node name missing");
1316         return;
1317     }
1318
1319     if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1320         error_setg(errp, "New snapshot node name already existing");
1321         return;
1322     }
1323
1324     if (!bdrv_is_inserted(state->old_bs)) {
1325         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1326         return;
1327     }
1328
1329     if (bdrv_op_is_blocked(state->old_bs,
1330                            BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1331         return;
1332     }
1333
1334     if (!bdrv_is_read_only(state->old_bs)) {
1335         if (bdrv_flush(state->old_bs)) {
1336             error_set(errp, QERR_IO_ERROR);
1337             return;
1338         }
1339     }
1340
1341     if (!bdrv_is_first_non_filter(state->old_bs)) {
1342         error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1343         return;
1344     }
1345
1346     flags = state->old_bs->open_flags;
1347
1348     /* create new image w/backing file */
1349     if (mode != NEW_IMAGE_MODE_EXISTING) {
1350         bdrv_img_create(new_image_file, format,
1351                         state->old_bs->filename,
1352                         state->old_bs->drv->format_name,
1353                         NULL, -1, flags, &local_err, false);
1354         if (local_err) {
1355             error_propagate(errp, local_err);
1356             return;
1357         }
1358     }
1359
1360     if (has_snapshot_node_name) {
1361         options = qdict_new();
1362         qdict_put(options, "node-name",
1363                   qstring_from_str(snapshot_node_name));
1364     }
1365
1366     /* TODO Inherit bs->options or only take explicit options with an
1367      * extended QMP command? */
1368     assert(state->new_bs == NULL);
1369     ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1370                     flags | BDRV_O_NO_BACKING, drv, &local_err);
1371     /* We will manually add the backing_hd field to the bs later */
1372     if (ret != 0) {
1373         error_propagate(errp, local_err);
1374     }
1375 }
1376
1377 static void external_snapshot_commit(BlkTransactionState *common)
1378 {
1379     ExternalSnapshotState *state =
1380                              DO_UPCAST(ExternalSnapshotState, common, common);
1381
1382     /* This removes our old bs and adds the new bs */
1383     bdrv_append(state->new_bs, state->old_bs);
1384     /* We don't need (or want) to use the transactional
1385      * bdrv_reopen_multiple() across all the entries at once, because we
1386      * don't want to abort all of them if one of them fails the reopen */
1387     bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1388                 NULL);
1389 }
1390
1391 static void external_snapshot_abort(BlkTransactionState *common)
1392 {
1393     ExternalSnapshotState *state =
1394                              DO_UPCAST(ExternalSnapshotState, common, common);
1395     if (state->new_bs) {
1396         bdrv_unref(state->new_bs);
1397     }
1398 }
1399
1400 typedef struct DriveBackupState {
1401     BlkTransactionState common;
1402     BlockDriverState *bs;
1403     BlockJob *job;
1404 } DriveBackupState;
1405
1406 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1407 {
1408     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1409     DriveBackup *backup;
1410     Error *local_err = NULL;
1411
1412     assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1413     backup = common->action->drive_backup;
1414
1415     qmp_drive_backup(backup->device, backup->target,
1416                      backup->has_format, backup->format,
1417                      backup->sync,
1418                      backup->has_mode, backup->mode,
1419                      backup->has_speed, backup->speed,
1420                      backup->has_on_source_error, backup->on_source_error,
1421                      backup->has_on_target_error, backup->on_target_error,
1422                      &local_err);
1423     if (local_err) {
1424         error_propagate(errp, local_err);
1425         state->bs = NULL;
1426         state->job = NULL;
1427         return;
1428     }
1429
1430     state->bs = bdrv_find(backup->device);
1431     state->job = state->bs->job;
1432 }
1433
1434 static void drive_backup_abort(BlkTransactionState *common)
1435 {
1436     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1437     BlockDriverState *bs = state->bs;
1438
1439     /* Only cancel if it's the job we started */
1440     if (bs && bs->job && bs->job == state->job) {
1441         block_job_cancel_sync(bs->job);
1442     }
1443 }
1444
1445 static void abort_prepare(BlkTransactionState *common, Error **errp)
1446 {
1447     error_setg(errp, "Transaction aborted using Abort action");
1448 }
1449
1450 static void abort_commit(BlkTransactionState *common)
1451 {
1452     g_assert_not_reached(); /* this action never succeeds */
1453 }
1454
1455 static const BdrvActionOps actions[] = {
1456     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1457         .instance_size = sizeof(ExternalSnapshotState),
1458         .prepare  = external_snapshot_prepare,
1459         .commit   = external_snapshot_commit,
1460         .abort = external_snapshot_abort,
1461     },
1462     [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1463         .instance_size = sizeof(DriveBackupState),
1464         .prepare = drive_backup_prepare,
1465         .abort = drive_backup_abort,
1466     },
1467     [TRANSACTION_ACTION_KIND_ABORT] = {
1468         .instance_size = sizeof(BlkTransactionState),
1469         .prepare = abort_prepare,
1470         .commit = abort_commit,
1471     },
1472     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1473         .instance_size = sizeof(InternalSnapshotState),
1474         .prepare  = internal_snapshot_prepare,
1475         .abort = internal_snapshot_abort,
1476     },
1477 };
1478
1479 /*
1480  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
1481  *  then we do not pivot any of the devices in the group, and abandon the
1482  *  snapshots
1483  */
1484 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1485 {
1486     TransactionActionList *dev_entry = dev_list;
1487     BlkTransactionState *state, *next;
1488     Error *local_err = NULL;
1489
1490     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1491     QSIMPLEQ_INIT(&snap_bdrv_states);
1492
1493     /* drain all i/o before any snapshots */
1494     bdrv_drain_all();
1495
1496     /* We don't do anything in this loop that commits us to the snapshot */
1497     while (NULL != dev_entry) {
1498         TransactionAction *dev_info = NULL;
1499         const BdrvActionOps *ops;
1500
1501         dev_info = dev_entry->value;
1502         dev_entry = dev_entry->next;
1503
1504         assert(dev_info->kind < ARRAY_SIZE(actions));
1505
1506         ops = &actions[dev_info->kind];
1507         assert(ops->instance_size > 0);
1508
1509         state = g_malloc0(ops->instance_size);
1510         state->ops = ops;
1511         state->action = dev_info;
1512         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1513
1514         state->ops->prepare(state, &local_err);
1515         if (local_err) {
1516             error_propagate(errp, local_err);
1517             goto delete_and_fail;
1518         }
1519     }
1520
1521     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1522         if (state->ops->commit) {
1523             state->ops->commit(state);
1524         }
1525     }
1526
1527     /* success */
1528     goto exit;
1529
1530 delete_and_fail:
1531     /*
1532     * failure, and it is all-or-none; abandon each new bs, and keep using
1533     * the original bs for all images
1534     */
1535     QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1536         if (state->ops->abort) {
1537             state->ops->abort(state);
1538         }
1539     }
1540 exit:
1541     QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1542         if (state->ops->clean) {
1543             state->ops->clean(state);
1544         }
1545         g_free(state);
1546     }
1547 }
1548
1549
1550 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1551 {
1552     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1553         return;
1554     }
1555     if (!bdrv_dev_has_removable_media(bs)) {
1556         error_setg(errp, "Device '%s' is not removable",
1557                    bdrv_get_device_name(bs));
1558         return;
1559     }
1560
1561     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1562         bdrv_dev_eject_request(bs, force);
1563         if (!force) {
1564             error_setg(errp, "Device '%s' is locked",
1565                        bdrv_get_device_name(bs));
1566             return;
1567         }
1568     }
1569
1570     bdrv_close(bs);
1571 }
1572
1573 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1574 {
1575     BlockDriverState *bs;
1576
1577     bs = bdrv_find(device);
1578     if (!bs) {
1579         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1580         return;
1581     }
1582
1583     eject_device(bs, force, errp);
1584 }
1585
1586 void qmp_block_passwd(bool has_device, const char *device,
1587                       bool has_node_name, const char *node_name,
1588                       const char *password, Error **errp)
1589 {
1590     Error *local_err = NULL;
1591     BlockDriverState *bs;
1592     int err;
1593
1594     bs = bdrv_lookup_bs(has_device ? device : NULL,
1595                         has_node_name ? node_name : NULL,
1596                         &local_err);
1597     if (local_err) {
1598         error_propagate(errp, local_err);
1599         return;
1600     }
1601
1602     err = bdrv_set_key(bs, password);
1603     if (err == -EINVAL) {
1604         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1605         return;
1606     } else if (err < 0) {
1607         error_set(errp, QERR_INVALID_PASSWORD);
1608         return;
1609     }
1610 }
1611
1612 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1613                                     int bdrv_flags, BlockDriver *drv,
1614                                     const char *password, Error **errp)
1615 {
1616     Error *local_err = NULL;
1617     int ret;
1618
1619     ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1620     if (ret < 0) {
1621         error_propagate(errp, local_err);
1622         return;
1623     }
1624
1625     if (bdrv_key_required(bs)) {
1626         if (password) {
1627             if (bdrv_set_key(bs, password) < 0) {
1628                 error_set(errp, QERR_INVALID_PASSWORD);
1629             }
1630         } else {
1631             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1632                       bdrv_get_encrypted_filename(bs));
1633         }
1634     } else if (password) {
1635         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1636     }
1637 }
1638
1639 void qmp_change_blockdev(const char *device, const char *filename,
1640                          const char *format, Error **errp)
1641 {
1642     BlockDriverState *bs;
1643     BlockDriver *drv = NULL;
1644     int bdrv_flags;
1645     Error *err = NULL;
1646
1647     bs = bdrv_find(device);
1648     if (!bs) {
1649         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1650         return;
1651     }
1652
1653     if (format) {
1654         drv = bdrv_find_whitelisted_format(format, bs->read_only);
1655         if (!drv) {
1656             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1657             return;
1658         }
1659     }
1660
1661     eject_device(bs, 0, &err);
1662     if (err) {
1663         error_propagate(errp, err);
1664         return;
1665     }
1666
1667     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1668     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1669
1670     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1671 }
1672
1673 /* throttling disk I/O limits */
1674 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1675                                int64_t bps_wr,
1676                                int64_t iops,
1677                                int64_t iops_rd,
1678                                int64_t iops_wr,
1679                                bool has_bps_max,
1680                                int64_t bps_max,
1681                                bool has_bps_rd_max,
1682                                int64_t bps_rd_max,
1683                                bool has_bps_wr_max,
1684                                int64_t bps_wr_max,
1685                                bool has_iops_max,
1686                                int64_t iops_max,
1687                                bool has_iops_rd_max,
1688                                int64_t iops_rd_max,
1689                                bool has_iops_wr_max,
1690                                int64_t iops_wr_max,
1691                                bool has_iops_size,
1692                                int64_t iops_size, Error **errp)
1693 {
1694     ThrottleConfig cfg;
1695     BlockDriverState *bs;
1696     AioContext *aio_context;
1697
1698     bs = bdrv_find(device);
1699     if (!bs) {
1700         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1701         return;
1702     }
1703
1704     memset(&cfg, 0, sizeof(cfg));
1705     cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1706     cfg.buckets[THROTTLE_BPS_READ].avg  = bps_rd;
1707     cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1708
1709     cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1710     cfg.buckets[THROTTLE_OPS_READ].avg  = iops_rd;
1711     cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1712
1713     if (has_bps_max) {
1714         cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1715     }
1716     if (has_bps_rd_max) {
1717         cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1718     }
1719     if (has_bps_wr_max) {
1720         cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1721     }
1722     if (has_iops_max) {
1723         cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1724     }
1725     if (has_iops_rd_max) {
1726         cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1727     }
1728     if (has_iops_wr_max) {
1729         cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1730     }
1731
1732     if (has_iops_size) {
1733         cfg.op_size = iops_size;
1734     }
1735
1736     if (!check_throttle_config(&cfg, errp)) {
1737         return;
1738     }
1739
1740     aio_context = bdrv_get_aio_context(bs);
1741     aio_context_acquire(aio_context);
1742
1743     if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1744         bdrv_io_limits_enable(bs);
1745     } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1746         bdrv_io_limits_disable(bs);
1747     }
1748
1749     if (bs->io_limits_enabled) {
1750         bdrv_set_io_limits(bs, &cfg);
1751     }
1752
1753     aio_context_release(aio_context);
1754 }
1755
1756 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1757 {
1758     const char *id = qdict_get_str(qdict, "id");
1759     BlockDriverState *bs;
1760     Error *local_err = NULL;
1761
1762     bs = bdrv_find(id);
1763     if (!bs) {
1764         error_report("Device '%s' not found", id);
1765         return -1;
1766     }
1767     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1768         error_report("%s", error_get_pretty(local_err));
1769         error_free(local_err);
1770         return -1;
1771     }
1772
1773     /* quiesce block driver; prevent further io */
1774     bdrv_drain_all();
1775     bdrv_flush(bs);
1776     bdrv_close(bs);
1777
1778     /* if we have a device attached to this BlockDriverState
1779      * then we need to make the drive anonymous until the device
1780      * can be removed.  If this is a drive with no device backing
1781      * then we can just get rid of the block driver state right here.
1782      */
1783     if (bdrv_get_attached_dev(bs)) {
1784         bdrv_make_anon(bs);
1785
1786         /* Further I/O must not pause the guest */
1787         bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1788                           BLOCKDEV_ON_ERROR_REPORT);
1789     } else {
1790         drive_del(drive_get_by_blockdev(bs));
1791     }
1792
1793     return 0;
1794 }
1795
1796 void qmp_block_resize(bool has_device, const char *device,
1797                       bool has_node_name, const char *node_name,
1798                       int64_t size, Error **errp)
1799 {
1800     Error *local_err = NULL;
1801     BlockDriverState *bs;
1802     int ret;
1803
1804     bs = bdrv_lookup_bs(has_device ? device : NULL,
1805                         has_node_name ? node_name : NULL,
1806                         &local_err);
1807     if (local_err) {
1808         error_propagate(errp, local_err);
1809         return;
1810     }
1811
1812     if (!bdrv_is_first_non_filter(bs)) {
1813         error_set(errp, QERR_FEATURE_DISABLED, "resize");
1814         return;
1815     }
1816
1817     if (size < 0) {
1818         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1819         return;
1820     }
1821
1822     /* complete all in-flight operations before resizing the device */
1823     bdrv_drain_all();
1824
1825     ret = bdrv_truncate(bs, size);
1826     switch (ret) {
1827     case 0:
1828         break;
1829     case -ENOMEDIUM:
1830         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1831         break;
1832     case -ENOTSUP:
1833         error_set(errp, QERR_UNSUPPORTED);
1834         break;
1835     case -EACCES:
1836         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1837         break;
1838     case -EBUSY:
1839         error_set(errp, QERR_DEVICE_IN_USE, device);
1840         break;
1841     default:
1842         error_setg_errno(errp, -ret, "Could not resize");
1843         break;
1844     }
1845 }
1846
1847 static void block_job_cb(void *opaque, int ret)
1848 {
1849     BlockDriverState *bs = opaque;
1850     const char *msg = NULL;
1851
1852     trace_block_job_cb(bs, bs->job, ret);
1853
1854     assert(bs->job);
1855
1856     if (ret < 0) {
1857         msg = strerror(-ret);
1858     }
1859
1860     if (block_job_is_cancelled(bs->job)) {
1861         block_job_event_cancelled(bs->job);
1862     } else {
1863         block_job_event_completed(bs->job, msg);
1864     }
1865
1866     bdrv_put_ref_bh_schedule(bs);
1867 }
1868
1869 void qmp_block_stream(const char *device, bool has_base,
1870                       const char *base, bool has_speed, int64_t speed,
1871                       bool has_on_error, BlockdevOnError on_error,
1872                       Error **errp)
1873 {
1874     BlockDriverState *bs;
1875     BlockDriverState *base_bs = NULL;
1876     Error *local_err = NULL;
1877
1878     if (!has_on_error) {
1879         on_error = BLOCKDEV_ON_ERROR_REPORT;
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_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
1889         return;
1890     }
1891
1892     if (base) {
1893         base_bs = bdrv_find_backing_image(bs, base);
1894         if (base_bs == NULL) {
1895             error_set(errp, QERR_BASE_NOT_FOUND, base);
1896             return;
1897         }
1898     }
1899
1900     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1901                  on_error, block_job_cb, bs, &local_err);
1902     if (local_err) {
1903         error_propagate(errp, local_err);
1904         return;
1905     }
1906
1907     trace_qmp_block_stream(bs, bs->job);
1908 }
1909
1910 void qmp_block_commit(const char *device,
1911                       bool has_base, const char *base, const char *top,
1912                       bool has_speed, int64_t speed,
1913                       Error **errp)
1914 {
1915     BlockDriverState *bs;
1916     BlockDriverState *base_bs, *top_bs;
1917     Error *local_err = NULL;
1918     /* This will be part of the QMP command, if/when the
1919      * BlockdevOnError change for blkmirror makes it in
1920      */
1921     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1922
1923     if (!has_speed) {
1924         speed = 0;
1925     }
1926
1927     /* drain all i/o before commits */
1928     bdrv_drain_all();
1929
1930     bs = bdrv_find(device);
1931     if (!bs) {
1932         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1933         return;
1934     }
1935
1936     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) {
1937         return;
1938     }
1939
1940     /* default top_bs is the active layer */
1941     top_bs = bs;
1942
1943     if (top) {
1944         if (strcmp(bs->filename, top) != 0) {
1945             top_bs = bdrv_find_backing_image(bs, top);
1946         }
1947     }
1948
1949     if (top_bs == NULL) {
1950         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1951         return;
1952     }
1953
1954     if (has_base && base) {
1955         base_bs = bdrv_find_backing_image(top_bs, base);
1956     } else {
1957         base_bs = bdrv_find_base(top_bs);
1958     }
1959
1960     if (base_bs == NULL) {
1961         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1962         return;
1963     }
1964
1965     if (top_bs == bs) {
1966         commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
1967                             bs, &local_err);
1968     } else {
1969         commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1970                     &local_err);
1971     }
1972     if (local_err != NULL) {
1973         error_propagate(errp, local_err);
1974         return;
1975     }
1976 }
1977
1978 void qmp_drive_backup(const char *device, const char *target,
1979                       bool has_format, const char *format,
1980                       enum MirrorSyncMode sync,
1981                       bool has_mode, enum NewImageMode mode,
1982                       bool has_speed, int64_t speed,
1983                       bool has_on_source_error, BlockdevOnError on_source_error,
1984                       bool has_on_target_error, BlockdevOnError on_target_error,
1985                       Error **errp)
1986 {
1987     BlockDriverState *bs;
1988     BlockDriverState *target_bs;
1989     BlockDriverState *source = NULL;
1990     BlockDriver *drv = NULL;
1991     Error *local_err = NULL;
1992     int flags;
1993     int64_t size;
1994     int ret;
1995
1996     if (!has_speed) {
1997         speed = 0;
1998     }
1999     if (!has_on_source_error) {
2000         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2001     }
2002     if (!has_on_target_error) {
2003         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2004     }
2005     if (!has_mode) {
2006         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2007     }
2008
2009     bs = bdrv_find(device);
2010     if (!bs) {
2011         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2012         return;
2013     }
2014
2015     if (!bdrv_is_inserted(bs)) {
2016         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2017         return;
2018     }
2019
2020     if (!has_format) {
2021         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2022     }
2023     if (format) {
2024         drv = bdrv_find_format(format);
2025         if (!drv) {
2026             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2027             return;
2028         }
2029     }
2030
2031     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2032         return;
2033     }
2034
2035     flags = bs->open_flags | BDRV_O_RDWR;
2036
2037     /* See if we have a backing HD we can use to create our new image
2038      * on top of. */
2039     if (sync == MIRROR_SYNC_MODE_TOP) {
2040         source = bs->backing_hd;
2041         if (!source) {
2042             sync = MIRROR_SYNC_MODE_FULL;
2043         }
2044     }
2045     if (sync == MIRROR_SYNC_MODE_NONE) {
2046         source = bs;
2047     }
2048
2049     size = bdrv_getlength(bs);
2050     if (size < 0) {
2051         error_setg_errno(errp, -size, "bdrv_getlength failed");
2052         return;
2053     }
2054
2055     if (mode != NEW_IMAGE_MODE_EXISTING) {
2056         assert(format && drv);
2057         if (source) {
2058             bdrv_img_create(target, format, source->filename,
2059                             source->drv->format_name, NULL,
2060                             size, flags, &local_err, false);
2061         } else {
2062             bdrv_img_create(target, format, NULL, NULL, NULL,
2063                             size, flags, &local_err, false);
2064         }
2065     }
2066
2067     if (local_err) {
2068         error_propagate(errp, local_err);
2069         return;
2070     }
2071
2072     target_bs = NULL;
2073     ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2074     if (ret < 0) {
2075         error_propagate(errp, local_err);
2076         return;
2077     }
2078
2079     backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2080                  block_job_cb, bs, &local_err);
2081     if (local_err != NULL) {
2082         bdrv_unref(target_bs);
2083         error_propagate(errp, local_err);
2084         return;
2085     }
2086 }
2087
2088 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2089 {
2090     return bdrv_named_nodes_list();
2091 }
2092
2093 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
2094
2095 void qmp_drive_mirror(const char *device, const char *target,
2096                       bool has_format, const char *format,
2097                       enum MirrorSyncMode sync,
2098                       bool has_mode, enum NewImageMode mode,
2099                       bool has_speed, int64_t speed,
2100                       bool has_granularity, uint32_t granularity,
2101                       bool has_buf_size, int64_t buf_size,
2102                       bool has_on_source_error, BlockdevOnError on_source_error,
2103                       bool has_on_target_error, BlockdevOnError on_target_error,
2104                       Error **errp)
2105 {
2106     BlockDriverState *bs;
2107     BlockDriverState *source, *target_bs;
2108     BlockDriver *drv = NULL;
2109     Error *local_err = NULL;
2110     int flags;
2111     int64_t size;
2112     int ret;
2113
2114     if (!has_speed) {
2115         speed = 0;
2116     }
2117     if (!has_on_source_error) {
2118         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2119     }
2120     if (!has_on_target_error) {
2121         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2122     }
2123     if (!has_mode) {
2124         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2125     }
2126     if (!has_granularity) {
2127         granularity = 0;
2128     }
2129     if (!has_buf_size) {
2130         buf_size = DEFAULT_MIRROR_BUF_SIZE;
2131     }
2132
2133     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2134         error_set(errp, QERR_INVALID_PARAMETER, device);
2135         return;
2136     }
2137     if (granularity & (granularity - 1)) {
2138         error_set(errp, QERR_INVALID_PARAMETER, device);
2139         return;
2140     }
2141
2142     bs = bdrv_find(device);
2143     if (!bs) {
2144         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2145         return;
2146     }
2147
2148     if (!bdrv_is_inserted(bs)) {
2149         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2150         return;
2151     }
2152
2153     if (!has_format) {
2154         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2155     }
2156     if (format) {
2157         drv = bdrv_find_format(format);
2158         if (!drv) {
2159             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2160             return;
2161         }
2162     }
2163
2164     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2165         return;
2166     }
2167
2168     flags = bs->open_flags | BDRV_O_RDWR;
2169     source = bs->backing_hd;
2170     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2171         sync = MIRROR_SYNC_MODE_FULL;
2172     }
2173     if (sync == MIRROR_SYNC_MODE_NONE) {
2174         source = bs;
2175     }
2176
2177     size = bdrv_getlength(bs);
2178     if (size < 0) {
2179         error_setg_errno(errp, -size, "bdrv_getlength failed");
2180         return;
2181     }
2182
2183     if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2184         && mode != NEW_IMAGE_MODE_EXISTING)
2185     {
2186         /* create new image w/o backing file */
2187         assert(format && drv);
2188         bdrv_img_create(target, format,
2189                         NULL, NULL, NULL, size, flags, &local_err, false);
2190     } else {
2191         switch (mode) {
2192         case NEW_IMAGE_MODE_EXISTING:
2193             break;
2194         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2195             /* create new image with backing file */
2196             bdrv_img_create(target, format,
2197                             source->filename,
2198                             source->drv->format_name,
2199                             NULL, size, flags, &local_err, false);
2200             break;
2201         default:
2202             abort();
2203         }
2204     }
2205
2206     if (local_err) {
2207         error_propagate(errp, local_err);
2208         return;
2209     }
2210
2211     /* Mirroring takes care of copy-on-write using the source's backing
2212      * file.
2213      */
2214     target_bs = NULL;
2215     ret = bdrv_open(&target_bs, target, NULL, NULL, flags | BDRV_O_NO_BACKING,
2216                     drv, &local_err);
2217     if (ret < 0) {
2218         error_propagate(errp, local_err);
2219         return;
2220     }
2221
2222     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2223                  on_source_error, on_target_error,
2224                  block_job_cb, bs, &local_err);
2225     if (local_err != NULL) {
2226         bdrv_unref(target_bs);
2227         error_propagate(errp, local_err);
2228         return;
2229     }
2230 }
2231
2232 static BlockJob *find_block_job(const char *device)
2233 {
2234     BlockDriverState *bs;
2235
2236     bs = bdrv_find(device);
2237     if (!bs || !bs->job) {
2238         return NULL;
2239     }
2240     return bs->job;
2241 }
2242
2243 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2244 {
2245     BlockJob *job = find_block_job(device);
2246
2247     if (!job) {
2248         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2249         return;
2250     }
2251
2252     block_job_set_speed(job, speed, errp);
2253 }
2254
2255 void qmp_block_job_cancel(const char *device,
2256                           bool has_force, bool force, Error **errp)
2257 {
2258     BlockJob *job = find_block_job(device);
2259
2260     if (!has_force) {
2261         force = false;
2262     }
2263
2264     if (!job) {
2265         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2266         return;
2267     }
2268     if (job->paused && !force) {
2269         error_setg(errp, "The block job for device '%s' is currently paused",
2270                    device);
2271         return;
2272     }
2273
2274     trace_qmp_block_job_cancel(job);
2275     block_job_cancel(job);
2276 }
2277
2278 void qmp_block_job_pause(const char *device, Error **errp)
2279 {
2280     BlockJob *job = find_block_job(device);
2281
2282     if (!job) {
2283         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2284         return;
2285     }
2286
2287     trace_qmp_block_job_pause(job);
2288     block_job_pause(job);
2289 }
2290
2291 void qmp_block_job_resume(const char *device, Error **errp)
2292 {
2293     BlockJob *job = find_block_job(device);
2294
2295     if (!job) {
2296         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2297         return;
2298     }
2299
2300     trace_qmp_block_job_resume(job);
2301     block_job_resume(job);
2302 }
2303
2304 void qmp_block_job_complete(const char *device, Error **errp)
2305 {
2306     BlockJob *job = find_block_job(device);
2307
2308     if (!job) {
2309         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2310         return;
2311     }
2312
2313     trace_qmp_block_job_complete(job);
2314     block_job_complete(job, errp);
2315 }
2316
2317 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2318 {
2319     QmpOutputVisitor *ov = qmp_output_visitor_new();
2320     DriveInfo *dinfo;
2321     QObject *obj;
2322     QDict *qdict;
2323     Error *local_err = NULL;
2324
2325     /* Require an ID in the top level */
2326     if (!options->has_id) {
2327         error_setg(errp, "Block device needs an ID");
2328         goto fail;
2329     }
2330
2331     /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2332      * cache.direct=false instead of silently switching to aio=threads, except
2333      * when called from drive_new().
2334      *
2335      * For now, simply forbidding the combination for all drivers will do. */
2336     if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2337         bool direct = options->has_cache &&
2338                       options->cache->has_direct &&
2339                       options->cache->direct;
2340         if (!direct) {
2341             error_setg(errp, "aio=native requires cache.direct=true");
2342             goto fail;
2343         }
2344     }
2345
2346     visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2347                                &options, NULL, &local_err);
2348     if (local_err) {
2349         error_propagate(errp, local_err);
2350         goto fail;
2351     }
2352
2353     obj = qmp_output_get_qobject(ov);
2354     qdict = qobject_to_qdict(obj);
2355
2356     qdict_flatten(qdict);
2357
2358     dinfo = blockdev_init(NULL, qdict, &local_err);
2359     if (local_err) {
2360         error_propagate(errp, local_err);
2361         goto fail;
2362     }
2363
2364     if (bdrv_key_required(dinfo->bdrv)) {
2365         drive_del(dinfo);
2366         error_setg(errp, "blockdev-add doesn't support encrypted devices");
2367         goto fail;
2368     }
2369
2370 fail:
2371     qmp_output_visitor_cleanup(ov);
2372 }
2373
2374 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2375 {
2376     BlockJobInfoList **prev = opaque;
2377     BlockJob *job = bs->job;
2378
2379     if (job) {
2380         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2381         elem->value = block_job_query(bs->job);
2382         (*prev)->next = elem;
2383         *prev = elem;
2384     }
2385 }
2386
2387 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2388 {
2389     /* Dummy is a fake list element for holding the head pointer */
2390     BlockJobInfoList dummy = {};
2391     BlockJobInfoList *prev = &dummy;
2392     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2393     return dummy.next;
2394 }
2395
2396 QemuOptsList qemu_common_drive_opts = {
2397     .name = "drive",
2398     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2399     .desc = {
2400         {
2401             .name = "snapshot",
2402             .type = QEMU_OPT_BOOL,
2403             .help = "enable/disable snapshot mode",
2404         },{
2405             .name = "discard",
2406             .type = QEMU_OPT_STRING,
2407             .help = "discard operation (ignore/off, unmap/on)",
2408         },{
2409             .name = "cache.writeback",
2410             .type = QEMU_OPT_BOOL,
2411             .help = "enables writeback mode for any caches",
2412         },{
2413             .name = "cache.direct",
2414             .type = QEMU_OPT_BOOL,
2415             .help = "enables use of O_DIRECT (bypass the host page cache)",
2416         },{
2417             .name = "cache.no-flush",
2418             .type = QEMU_OPT_BOOL,
2419             .help = "ignore any flush requests for the device",
2420         },{
2421             .name = "aio",
2422             .type = QEMU_OPT_STRING,
2423             .help = "host AIO implementation (threads, native)",
2424         },{
2425             .name = "format",
2426             .type = QEMU_OPT_STRING,
2427             .help = "disk format (raw, qcow2, ...)",
2428         },{
2429             .name = "rerror",
2430             .type = QEMU_OPT_STRING,
2431             .help = "read error action",
2432         },{
2433             .name = "werror",
2434             .type = QEMU_OPT_STRING,
2435             .help = "write error action",
2436         },{
2437             .name = "read-only",
2438             .type = QEMU_OPT_BOOL,
2439             .help = "open drive file as read-only",
2440         },{
2441             .name = "throttling.iops-total",
2442             .type = QEMU_OPT_NUMBER,
2443             .help = "limit total I/O operations per second",
2444         },{
2445             .name = "throttling.iops-read",
2446             .type = QEMU_OPT_NUMBER,
2447             .help = "limit read operations per second",
2448         },{
2449             .name = "throttling.iops-write",
2450             .type = QEMU_OPT_NUMBER,
2451             .help = "limit write operations per second",
2452         },{
2453             .name = "throttling.bps-total",
2454             .type = QEMU_OPT_NUMBER,
2455             .help = "limit total bytes per second",
2456         },{
2457             .name = "throttling.bps-read",
2458             .type = QEMU_OPT_NUMBER,
2459             .help = "limit read bytes per second",
2460         },{
2461             .name = "throttling.bps-write",
2462             .type = QEMU_OPT_NUMBER,
2463             .help = "limit write bytes per second",
2464         },{
2465             .name = "throttling.iops-total-max",
2466             .type = QEMU_OPT_NUMBER,
2467             .help = "I/O operations burst",
2468         },{
2469             .name = "throttling.iops-read-max",
2470             .type = QEMU_OPT_NUMBER,
2471             .help = "I/O operations read burst",
2472         },{
2473             .name = "throttling.iops-write-max",
2474             .type = QEMU_OPT_NUMBER,
2475             .help = "I/O operations write burst",
2476         },{
2477             .name = "throttling.bps-total-max",
2478             .type = QEMU_OPT_NUMBER,
2479             .help = "total bytes burst",
2480         },{
2481             .name = "throttling.bps-read-max",
2482             .type = QEMU_OPT_NUMBER,
2483             .help = "total bytes read burst",
2484         },{
2485             .name = "throttling.bps-write-max",
2486             .type = QEMU_OPT_NUMBER,
2487             .help = "total bytes write burst",
2488         },{
2489             .name = "throttling.iops-size",
2490             .type = QEMU_OPT_NUMBER,
2491             .help = "when limiting by iops max size of an I/O in bytes",
2492         },{
2493             .name = "copy-on-read",
2494             .type = QEMU_OPT_BOOL,
2495             .help = "copy read data from backing file into image file",
2496         },{
2497             .name = "detect-zeroes",
2498             .type = QEMU_OPT_STRING,
2499             .help = "try to optimize zero writes (off, on, unmap)",
2500         },
2501         { /* end of list */ }
2502     },
2503 };
2504
2505 QemuOptsList qemu_drive_opts = {
2506     .name = "drive",
2507     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2508     .desc = {
2509         /*
2510          * no elements => accept any params
2511          * validation will happen later
2512          */
2513         { /* end of list */ }
2514     },
2515 };