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-common.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_delete(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     DriveInfo *dinfo;
 238 } DrivePutRefBH;
 239
 240 static void drive_put_ref_bh(void *opaque)
 241 {
 242     DrivePutRefBH *s = opaque;
 243
 244     drive_put_ref(s->dinfo);
 245     qemu_bh_delete(s->bh);
 246     g_free(s);
 247 }
 248
 249 /*
 250  * Release a drive reference in a BH
 251  *
 252  * It is not possible to use drive_put_ref() from a callback function when the
 253  * callers still need the drive.  In such cases we schedule a BH to release the
 254  * reference.
 255  */
 256 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
 257 {
 258     DrivePutRefBH *s;
 259
 260     s = g_new(DrivePutRefBH, 1);
 261     s->bh = qemu_bh_new(drive_put_ref_bh, s);
 262     s->dinfo = dinfo;
 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 do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
 284 {
 285     bool bps_flag;
 286     bool iops_flag;
 287
 288     assert(io_limits);
 289
 290     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 291                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 292                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 293     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 294                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 295                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 296     if (bps_flag || iops_flag) {
 297         error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 298                          "cannot be used at the same time");
 299         return false;
 300     }
 301
 302     if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 303         io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
 304         io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
 305         io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
 306         io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
 307         io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
 308         error_setg(errp, "bps and iops values must be 0 or greater");
 309         return false;
 310     }
 311
 312     return true;
 313 }
 314
 315 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 316 {
 317     const char *buf;
 318     const char *file = NULL;
 319     const char *serial;
 320     const char *mediastr = "";
 321     BlockInterfaceType type;
 322     enum { MEDIA_DISK, MEDIA_CDROM } media;
 323     int bus_id, unit_id;
 324     int cyls, heads, secs, translation;
 325     BlockDriver *drv = NULL;
 326     int max_devs;
 327     int index;
 328     int ro = 0;
 329     int bdrv_flags = 0;
 330     int on_read_error, on_write_error;
 331     const char *devaddr;
 332     DriveInfo *dinfo;
 333     BlockIOLimit io_limits;
 334     int snapshot = 0;
 335     bool copy_on_read;
 336     int ret;
 337     Error *error = NULL;
 338     QemuOpts *opts;
 339     QDict *bs_opts;
 340     const char *id;
 341
 342     translation = BIOS_ATA_TRANSLATION_AUTO;
 343     media = MEDIA_DISK;
 344
 345     /* Check common options by copying from all_opts to opts, all other options
 346      * are stored in bs_opts. */
 347     id = qemu_opts_id(all_opts);
 348     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
 349     if (error_is_set(&error)) {
 350         qerror_report_err(error);
 351         error_free(error);
 352         return NULL;
 353     }
 354
 355     bs_opts = qdict_new();
 356     qemu_opts_to_qdict(all_opts, bs_opts);
 357     qemu_opts_absorb_qdict(opts, bs_opts, &error);
 358     if (error_is_set(&error)) {
 359         qerror_report_err(error);
 360         error_free(error);
 361         return NULL;
 362     }
 363
 364     if (id) {
 365         qdict_del(bs_opts, "id");
 366     }
 367
 368     /* extract parameters */
 369     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 370     unit_id = qemu_opt_get_number(opts, "unit", -1);
 371     index   = qemu_opt_get_number(opts, "index", -1);
 372
 373     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 374     heads = qemu_opt_get_number(opts, "heads", 0);
 375     secs  = qemu_opt_get_number(opts, "secs", 0);
 376
 377     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 378     ro = qemu_opt_get_bool(opts, "readonly", 0);
 379     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 380
 381     file = qemu_opt_get(opts, "file");
 382     serial = qemu_opt_get(opts, "serial");
 383
 384     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 385         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 386             ;
 387         if (type == IF_COUNT) {
 388             error_report("unsupported bus type '%s'", buf);
 389             return NULL;
 390         }
 391     } else {
 392         type = block_default_type;
 393     }
 394
 395     max_devs = if_max_devs[type];
 396
 397     if (cyls || heads || secs) {
 398         if (cyls < 1) {
 399             error_report("invalid physical cyls number");
 400             return NULL;
 401         }
 402         if (heads < 1) {
 403             error_report("invalid physical heads number");
 404             return NULL;
 405         }
 406         if (secs < 1) {
 407             error_report("invalid physical secs number");
 408             return NULL;
 409         }
 410     }
 411
 412     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 413         if (!cyls) {
 414             error_report("'%s' trans must be used with cyls, heads and secs",
 415                          buf);
 416             return NULL;
 417         }
 418         if (!strcmp(buf, "none"))
 419             translation = BIOS_ATA_TRANSLATION_NONE;
 420         else if (!strcmp(buf, "lba"))
 421             translation = BIOS_ATA_TRANSLATION_LBA;
 422         else if (!strcmp(buf, "auto"))
 423             translation = BIOS_ATA_TRANSLATION_AUTO;
 424         else {
 425             error_report("'%s' invalid translation type", buf);
 426             return NULL;
 427         }
 428     }
 429
 430     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 431         if (!strcmp(buf, "disk")) {
 432             media = MEDIA_DISK;
 433         } else if (!strcmp(buf, "cdrom")) {
 434             if (cyls || secs || heads) {
 435                 error_report("CHS can't be set with media=%s", buf);
 436                 return NULL;
 437             }
 438             media = MEDIA_CDROM;
 439         } else {
 440             error_report("'%s' invalid media", buf);
 441             return NULL;
 442         }
 443     }
 444
 445     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
 446         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
 447             error_report("invalid discard option");
 448             return NULL;
 449         }
 450     }
 451
 452     bdrv_flags |= BDRV_O_CACHE_WB;
 453     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 454         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 455             error_report("invalid cache option");
 456             return NULL;
 457         }
 458     }
 459
 460 #ifdef CONFIG_LINUX_AIO
 461     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 462         if (!strcmp(buf, "native")) {
 463             bdrv_flags |= BDRV_O_NATIVE_AIO;
 464         } else if (!strcmp(buf, "threads")) {
 465             /* this is the default */
 466         } else {
 467            error_report("invalid aio option");
 468            return NULL;
 469         }
 470     }
 471 #endif
 472
 473     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 474         if (is_help_option(buf)) {
 475             error_printf("Supported formats:");
 476             bdrv_iterate_format(bdrv_format_print, NULL);
 477             error_printf("\n");
 478             return NULL;
 479         }
 480         drv = bdrv_find_whitelisted_format(buf);
 481         if (!drv) {
 482             error_report("'%s' invalid format", buf);
 483             return NULL;
 484         }
 485     }
 486
 487     /* disk I/O throttling */
 488     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 489                            qemu_opt_get_number(opts, "bps", 0);
 490     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 491                            qemu_opt_get_number(opts, "bps_rd", 0);
 492     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 493                            qemu_opt_get_number(opts, "bps_wr", 0);
 494     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 495                            qemu_opt_get_number(opts, "iops", 0);
 496     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 497                            qemu_opt_get_number(opts, "iops_rd", 0);
 498     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 499                            qemu_opt_get_number(opts, "iops_wr", 0);
 500
 501     if (!do_check_io_limits(&io_limits, &error)) {
 502         error_report("%s", error_get_pretty(error));
 503         error_free(error);
 504         return NULL;
 505     }
 506
 507     if (qemu_opt_get(opts, "boot") != NULL) {
 508         fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
 509                 "ignored. Future versions will reject this parameter. Please "
 510                 "update your scripts.\n");
 511     }
 512
 513     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
 514     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 515         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 516             error_report("werror is not supported by this bus type");
 517             return NULL;
 518         }
 519
 520         on_write_error = parse_block_error_action(buf, 0);
 521         if (on_write_error < 0) {
 522             return NULL;
 523         }
 524     }
 525
 526     on_read_error = BLOCKDEV_ON_ERROR_REPORT;
 527     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 528         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 529             error_report("rerror is not supported by this bus type");
 530             return NULL;
 531         }
 532
 533         on_read_error = parse_block_error_action(buf, 1);
 534         if (on_read_error < 0) {
 535             return NULL;
 536         }
 537     }
 538
 539     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 540         if (type != IF_VIRTIO) {
 541             error_report("addr is not supported by this bus type");
 542             return NULL;
 543         }
 544     }
 545
 546     /* compute bus and unit according index */
 547
 548     if (index != -1) {
 549         if (bus_id != 0 || unit_id != -1) {
 550             error_report("index cannot be used with bus and unit");
 551             return NULL;
 552         }
 553         bus_id = drive_index_to_bus_id(type, index);
 554         unit_id = drive_index_to_unit_id(type, index);
 555     }
 556
 557     /* if user doesn't specify a unit_id,
 558      * try to find the first free
 559      */
 560
 561     if (unit_id == -1) {
 562        unit_id = 0;
 563        while (drive_get(type, bus_id, unit_id) != NULL) {
 564            unit_id++;
 565            if (max_devs && unit_id >= max_devs) {
 566                unit_id -= max_devs;
 567                bus_id++;
 568            }
 569        }
 570     }
 571
 572     /* check unit id */
 573
 574     if (max_devs && unit_id >= max_devs) {
 575         error_report("unit %d too big (max is %d)",
 576                      unit_id, max_devs - 1);
 577         return NULL;
 578     }
 579
 580     /*
 581      * catch multiple definitions
 582      */
 583
 584     if (drive_get(type, bus_id, unit_id) != NULL) {
 585         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 586                      bus_id, unit_id, index);
 587         return NULL;
 588     }
 589
 590     /* init */
 591
 592     dinfo = g_malloc0(sizeof(*dinfo));
 593     if ((buf = qemu_opts_id(opts)) != NULL) {
 594         dinfo->id = g_strdup(buf);
 595     } else {
 596         /* no id supplied -> create one */
 597         dinfo->id = g_malloc0(32);
 598         if (type == IF_IDE || type == IF_SCSI)
 599             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 600         if (max_devs)
 601             snprintf(dinfo->id, 32, "%s%i%s%i",
 602                      if_name[type], bus_id, mediastr, unit_id);
 603         else
 604             snprintf(dinfo->id, 32, "%s%s%i",
 605                      if_name[type], mediastr, unit_id);
 606     }
 607     dinfo->bdrv = bdrv_new(dinfo->id);
 608     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
 609     dinfo->bdrv->read_only = ro;
 610     dinfo->devaddr = devaddr;
 611     dinfo->type = type;
 612     dinfo->bus = bus_id;
 613     dinfo->unit = unit_id;
 614     dinfo->cyls = cyls;
 615     dinfo->heads = heads;
 616     dinfo->secs = secs;
 617     dinfo->trans = translation;
 618     dinfo->opts = all_opts;
 619     dinfo->refcount = 1;
 620     if (serial != NULL) {
 621         dinfo->serial = g_strdup(serial);
 622     }
 623     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 624
 625     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 626
 627     /* disk I/O throttling */
 628     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 629
 630     switch(type) {
 631     case IF_IDE:
 632     case IF_SCSI:
 633     case IF_XEN:
 634     case IF_NONE:
 635         dinfo->media_cd = media == MEDIA_CDROM;
 636         break;
 637     case IF_SD:
 638     case IF_FLOPPY:
 639     case IF_PFLASH:
 640     case IF_MTD:
 641         break;
 642     case IF_VIRTIO:
 643     {
 644         /* add virtio block device */
 645         QemuOpts *devopts;
 646         devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
 647         if (arch_type == QEMU_ARCH_S390X) {
 648             qemu_opt_set(devopts, "driver", "virtio-blk-s390");
 649         } else {
 650             qemu_opt_set(devopts, "driver", "virtio-blk-pci");
 651         }
 652         qemu_opt_set(devopts, "drive", dinfo->id);
 653         if (devaddr)
 654             qemu_opt_set(devopts, "addr", devaddr);
 655         break;
 656     }
 657     default:
 658         abort();
 659     }
 660     if (!file || !*file) {
 661         return dinfo;
 662     }
 663     if (snapshot) {
 664         /* always use cache=unsafe with snapshot */
 665         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 666         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 667     }
 668
 669     if (copy_on_read) {
 670         bdrv_flags |= BDRV_O_COPY_ON_READ;
 671     }
 672
 673     if (runstate_check(RUN_STATE_INMIGRATE)) {
 674         bdrv_flags |= BDRV_O_INCOMING;
 675     }
 676
 677     if (media == MEDIA_CDROM) {
 678         /* CDROM is fine for any interface, don't check.  */
 679         ro = 1;
 680     } else if (ro == 1) {
 681         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 682             type != IF_NONE && type != IF_PFLASH) {
 683             error_report("readonly not supported by this bus type");
 684             goto err;
 685         }
 686     }
 687
 688     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 689
 690     if (ro && copy_on_read) {
 691         error_report("warning: disabling copy_on_read on readonly drive");
 692     }
 693
 694     ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv);
 695     bs_opts = NULL;
 696
 697     if (ret < 0) {
 698         if (ret == -EMEDIUMTYPE) {
 699             error_report("could not open disk image %s: not in %s format",
 700                          file, drv->format_name);
 701         } else {
 702             error_report("could not open disk image %s: %s",
 703                          file, strerror(-ret));
 704         }
 705         goto err;
 706     }
 707
 708     if (bdrv_key_required(dinfo->bdrv))
 709         autostart = 0;
 710
 711     qemu_opts_del(opts);
 712
 713     return dinfo;
 714
 715 err:
 716     qemu_opts_del(opts);
 717     QDECREF(bs_opts);
 718     bdrv_delete(dinfo->bdrv);
 719     g_free(dinfo->id);
 720     QTAILQ_REMOVE(&drives, dinfo, next);
 721     g_free(dinfo);
 722     return NULL;
 723 }
 724
 725 void do_commit(Monitor *mon, const QDict *qdict)
 726 {
 727     const char *device = qdict_get_str(qdict, "device");
 728     BlockDriverState *bs;
 729     int ret;
 730
 731     if (!strcmp(device, "all")) {
 732         ret = bdrv_commit_all();
 733     } else {
 734         bs = bdrv_find(device);
 735         if (!bs) {
 736             monitor_printf(mon, "Device '%s' not found\n", device);
 737             return;
 738         }
 739         ret = bdrv_commit(bs);
 740     }
 741     if (ret < 0) {
 742         monitor_printf(mon, "'commit' error for '%s': %s\n", device,
 743                        strerror(-ret));
 744     }
 745 }
 746
 747 static void blockdev_do_action(int kind, void *data, Error **errp)
 748 {
 749     BlockdevAction action;
 750     BlockdevActionList list;
 751
 752     action.kind = kind;
 753     action.data = data;
 754     list.value = &action;
 755     list.next = NULL;
 756     qmp_transaction(&list, errp);
 757 }
 758
 759 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 760                                 bool has_format, const char *format,
 761                                 bool has_mode, enum NewImageMode mode,
 762                                 Error **errp)
 763 {
 764     BlockdevSnapshot snapshot = {
 765         .device = (char *) device,
 766         .snapshot_file = (char *) snapshot_file,
 767         .has_format = has_format,
 768         .format = (char *) format,
 769         .has_mode = has_mode,
 770         .mode = mode,
 771     };
 772     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 773                        errp);
 774 }
 775
 776
 777 /* New and old BlockDriverState structs for group snapshots */
 778 typedef struct BlkTransactionStates {
 779     BlockDriverState *old_bs;
 780     BlockDriverState *new_bs;
 781     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 782 } BlkTransactionStates;
 783
 784 /*
 785  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 786  *  then we do not pivot any of the devices in the group, and abandon the
 787  *  snapshots
 788  */
 789 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 790 {
 791     int ret = 0;
 792     BlockdevActionList *dev_entry = dev_list;
 793     BlkTransactionStates *states, *next;
 794     Error *local_err = NULL;
 795
 796     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 797     QSIMPLEQ_INIT(&snap_bdrv_states);
 798
 799     /* drain all i/o before any snapshots */
 800     bdrv_drain_all();
 801
 802     /* We don't do anything in this loop that commits us to the snapshot */
 803     while (NULL != dev_entry) {
 804         BlockdevAction *dev_info = NULL;
 805         BlockDriver *proto_drv;
 806         BlockDriver *drv;
 807         int flags;
 808         enum NewImageMode mode;
 809         const char *new_image_file;
 810         const char *device;
 811         const char *format = "qcow2";
 812
 813         dev_info = dev_entry->value;
 814         dev_entry = dev_entry->next;
 815
 816         states = g_malloc0(sizeof(BlkTransactionStates));
 817         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 818
 819         switch (dev_info->kind) {
 820         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 821             device = dev_info->blockdev_snapshot_sync->device;
 822             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 823                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 824             }
 825             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 826             if (dev_info->blockdev_snapshot_sync->has_format) {
 827                 format = dev_info->blockdev_snapshot_sync->format;
 828             }
 829             mode = dev_info->blockdev_snapshot_sync->mode;
 830             break;
 831         default:
 832             abort();
 833         }
 834
 835         drv = bdrv_find_format(format);
 836         if (!drv) {
 837             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 838             goto delete_and_fail;
 839         }
 840
 841         states->old_bs = bdrv_find(device);
 842         if (!states->old_bs) {
 843             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 844             goto delete_and_fail;
 845         }
 846
 847         if (!bdrv_is_inserted(states->old_bs)) {
 848             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 849             goto delete_and_fail;
 850         }
 851
 852         if (bdrv_in_use(states->old_bs)) {
 853             error_set(errp, QERR_DEVICE_IN_USE, device);
 854             goto delete_and_fail;
 855         }
 856
 857         if (!bdrv_is_read_only(states->old_bs)) {
 858             if (bdrv_flush(states->old_bs)) {
 859                 error_set(errp, QERR_IO_ERROR);
 860                 goto delete_and_fail;
 861             }
 862         }
 863
 864         flags = states->old_bs->open_flags;
 865
 866         proto_drv = bdrv_find_protocol(new_image_file);
 867         if (!proto_drv) {
 868             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 869             goto delete_and_fail;
 870         }
 871
 872         /* create new image w/backing file */
 873         if (mode != NEW_IMAGE_MODE_EXISTING) {
 874             bdrv_img_create(new_image_file, format,
 875                             states->old_bs->filename,
 876                             states->old_bs->drv->format_name,
 877                             NULL, -1, flags, &local_err, false);
 878             if (error_is_set(&local_err)) {
 879                 error_propagate(errp, local_err);
 880                 goto delete_and_fail;
 881             }
 882         }
 883
 884         /* We will manually add the backing_hd field to the bs later */
 885         states->new_bs = bdrv_new("");
 886         /* TODO Inherit bs->options or only take explicit options with an
 887          * extended QMP command? */
 888         ret = bdrv_open(states->new_bs, new_image_file, NULL,
 889                         flags | BDRV_O_NO_BACKING, drv);
 890         if (ret != 0) {
 891             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 892             goto delete_and_fail;
 893         }
 894     }
 895
 896
 897     /* Now we are going to do the actual pivot.  Everything up to this point
 898      * is reversible, but we are committed at this point */
 899     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 900         /* This removes our old bs from the bdrv_states, and adds the new bs */
 901         bdrv_append(states->new_bs, states->old_bs);
 902         /* We don't need (or want) to use the transactional
 903          * bdrv_reopen_multiple() across all the entries at once, because we
 904          * don't want to abort all of them if one of them fails the reopen */
 905         bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
 906                     NULL);
 907     }
 908
 909     /* success */
 910     goto exit;
 911
 912 delete_and_fail:
 913     /*
 914     * failure, and it is all-or-none; abandon each new bs, and keep using
 915     * the original bs for all images
 916     */
 917     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 918         if (states->new_bs) {
 919              bdrv_delete(states->new_bs);
 920         }
 921     }
 922 exit:
 923     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 924         g_free(states);
 925     }
 926 }
 927
 928
 929 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 930 {
 931     if (bdrv_in_use(bs)) {
 932         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 933         return;
 934     }
 935     if (!bdrv_dev_has_removable_media(bs)) {
 936         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 937         return;
 938     }
 939
 940     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 941         bdrv_dev_eject_request(bs, force);
 942         if (!force) {
 943             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 944             return;
 945         }
 946     }
 947
 948     bdrv_close(bs);
 949 }
 950
 951 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 952 {
 953     BlockDriverState *bs;
 954
 955     bs = bdrv_find(device);
 956     if (!bs) {
 957         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 958         return;
 959     }
 960
 961     eject_device(bs, force, errp);
 962 }
 963
 964 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 965 {
 966     BlockDriverState *bs;
 967     int err;
 968
 969     bs = bdrv_find(device);
 970     if (!bs) {
 971         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 972         return;
 973     }
 974
 975     err = bdrv_set_key(bs, password);
 976     if (err == -EINVAL) {
 977         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 978         return;
 979     } else if (err < 0) {
 980         error_set(errp, QERR_INVALID_PASSWORD);
 981         return;
 982     }
 983 }
 984
 985 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 986                                     int bdrv_flags, BlockDriver *drv,
 987                                     const char *password, Error **errp)
 988 {
 989     if (bdrv_open(bs, filename, NULL, bdrv_flags, drv) < 0) {
 990         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 991         return;
 992     }
 993
 994     if (bdrv_key_required(bs)) {
 995         if (password) {
 996             if (bdrv_set_key(bs, password) < 0) {
 997                 error_set(errp, QERR_INVALID_PASSWORD);
 998             }
 999         } else {
1000             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1001                       bdrv_get_encrypted_filename(bs));
1002         }
1003     } else if (password) {
1004         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1005     }
1006 }
1007
1008 void qmp_change_blockdev(const char *device, const char *filename,
1009                          bool has_format, const char *format, Error **errp)
1010 {
1011     BlockDriverState *bs;
1012     BlockDriver *drv = NULL;
1013     int bdrv_flags;
1014     Error *err = NULL;
1015
1016     bs = bdrv_find(device);
1017     if (!bs) {
1018         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1019         return;
1020     }
1021
1022     if (format) {
1023         drv = bdrv_find_whitelisted_format(format);
1024         if (!drv) {
1025             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1026             return;
1027         }
1028     }
1029
1030     eject_device(bs, 0, &err);
1031     if (error_is_set(&err)) {
1032         error_propagate(errp, err);
1033         return;
1034     }
1035
1036     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1037     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1038
1039     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1040 }
1041
1042 /* throttling disk I/O limits */
1043 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1044                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
1045                                int64_t iops_wr, Error **errp)
1046 {
1047     BlockIOLimit io_limits;
1048     BlockDriverState *bs;
1049
1050     bs = bdrv_find(device);
1051     if (!bs) {
1052         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1053         return;
1054     }
1055
1056     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
1057     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
1058     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
1059     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
1060     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
1061     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
1062
1063     if (!do_check_io_limits(&io_limits, errp)) {
1064         return;
1065     }
1066
1067     bs->io_limits = io_limits;
1068     bs->slice_time = BLOCK_IO_SLICE_TIME;
1069
1070     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
1071         bdrv_io_limits_enable(bs);
1072     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
1073         bdrv_io_limits_disable(bs);
1074     } else {
1075         if (bs->block_timer) {
1076             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
1077         }
1078     }
1079 }
1080
1081 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1082 {
1083     const char *id = qdict_get_str(qdict, "id");
1084     BlockDriverState *bs;
1085
1086     bs = bdrv_find(id);
1087     if (!bs) {
1088         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1089         return -1;
1090     }
1091     if (bdrv_in_use(bs)) {
1092         qerror_report(QERR_DEVICE_IN_USE, id);
1093         return -1;
1094     }
1095
1096     /* quiesce block driver; prevent further io */
1097     bdrv_drain_all();
1098     bdrv_flush(bs);
1099     bdrv_close(bs);
1100
1101     /* if we have a device attached to this BlockDriverState
1102      * then we need to make the drive anonymous until the device
1103      * can be removed.  If this is a drive with no device backing
1104      * then we can just get rid of the block driver state right here.
1105      */
1106     if (bdrv_get_attached_dev(bs)) {
1107         bdrv_make_anon(bs);
1108     } else {
1109         drive_uninit(drive_get_by_blockdev(bs));
1110     }
1111
1112     return 0;
1113 }
1114
1115 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1116 {
1117     BlockDriverState *bs;
1118
1119     bs = bdrv_find(device);
1120     if (!bs) {
1121         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1122         return;
1123     }
1124
1125     if (size < 0) {
1126         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1127         return;
1128     }
1129
1130     switch (bdrv_truncate(bs, size)) {
1131     case 0:
1132         break;
1133     case -ENOMEDIUM:
1134         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1135         break;
1136     case -ENOTSUP:
1137         error_set(errp, QERR_UNSUPPORTED);
1138         break;
1139     case -EACCES:
1140         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1141         break;
1142     case -EBUSY:
1143         error_set(errp, QERR_DEVICE_IN_USE, device);
1144         break;
1145     default:
1146         error_set(errp, QERR_UNDEFINED_ERROR);
1147         break;
1148     }
1149 }
1150
1151 static void block_job_cb(void *opaque, int ret)
1152 {
1153     BlockDriverState *bs = opaque;
1154     QObject *obj;
1155
1156     trace_block_job_cb(bs, bs->job, ret);
1157
1158     assert(bs->job);
1159     obj = qobject_from_block_job(bs->job);
1160     if (ret < 0) {
1161         QDict *dict = qobject_to_qdict(obj);
1162         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1163     }
1164
1165     if (block_job_is_cancelled(bs->job)) {
1166         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1167     } else {
1168         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1169     }
1170     qobject_decref(obj);
1171
1172     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1173 }
1174
1175 void qmp_block_stream(const char *device, bool has_base,
1176                       const char *base, bool has_speed, int64_t speed,
1177                       bool has_on_error, BlockdevOnError on_error,
1178                       Error **errp)
1179 {
1180     BlockDriverState *bs;
1181     BlockDriverState *base_bs = NULL;
1182     Error *local_err = NULL;
1183
1184     if (!has_on_error) {
1185         on_error = BLOCKDEV_ON_ERROR_REPORT;
1186     }
1187
1188     bs = bdrv_find(device);
1189     if (!bs) {
1190         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1191         return;
1192     }
1193
1194     if (base) {
1195         base_bs = bdrv_find_backing_image(bs, base);
1196         if (base_bs == NULL) {
1197             error_set(errp, QERR_BASE_NOT_FOUND, base);
1198             return;
1199         }
1200     }
1201
1202     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1203                  on_error, block_job_cb, bs, &local_err);
1204     if (error_is_set(&local_err)) {
1205         error_propagate(errp, local_err);
1206         return;
1207     }
1208
1209     /* Grab a reference so hotplug does not delete the BlockDriverState from
1210      * underneath us.
1211      */
1212     drive_get_ref(drive_get_by_blockdev(bs));
1213
1214     trace_qmp_block_stream(bs, bs->job);
1215 }
1216
1217 void qmp_block_commit(const char *device,
1218                       bool has_base, const char *base, const char *top,
1219                       bool has_speed, int64_t speed,
1220                       Error **errp)
1221 {
1222     BlockDriverState *bs;
1223     BlockDriverState *base_bs, *top_bs;
1224     Error *local_err = NULL;
1225     /* This will be part of the QMP command, if/when the
1226      * BlockdevOnError change for blkmirror makes it in
1227      */
1228     BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1229
1230     /* drain all i/o before commits */
1231     bdrv_drain_all();
1232
1233     bs = bdrv_find(device);
1234     if (!bs) {
1235         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1236         return;
1237     }
1238
1239     /* default top_bs is the active layer */
1240     top_bs = bs;
1241
1242     if (top) {
1243         if (strcmp(bs->filename, top) != 0) {
1244             top_bs = bdrv_find_backing_image(bs, top);
1245         }
1246     }
1247
1248     if (top_bs == NULL) {
1249         error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1250         return;
1251     }
1252
1253     if (has_base && base) {
1254         base_bs = bdrv_find_backing_image(top_bs, base);
1255     } else {
1256         base_bs = bdrv_find_base(top_bs);
1257     }
1258
1259     if (base_bs == NULL) {
1260         error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1261         return;
1262     }
1263
1264     commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1265                 &local_err);
1266     if (local_err != NULL) {
1267         error_propagate(errp, local_err);
1268         return;
1269     }
1270     /* Grab a reference so hotplug does not delete the BlockDriverState from
1271      * underneath us.
1272      */
1273     drive_get_ref(drive_get_by_blockdev(bs));
1274 }
1275
1276 #define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
1277
1278 void qmp_drive_mirror(const char *device, const char *target,
1279                       bool has_format, const char *format,
1280                       enum MirrorSyncMode sync,
1281                       bool has_mode, enum NewImageMode mode,
1282                       bool has_speed, int64_t speed,
1283                       bool has_granularity, uint32_t granularity,
1284                       bool has_buf_size, int64_t buf_size,
1285                       bool has_on_source_error, BlockdevOnError on_source_error,
1286                       bool has_on_target_error, BlockdevOnError on_target_error,
1287                       Error **errp)
1288 {
1289     BlockDriverState *bs;
1290     BlockDriverState *source, *target_bs;
1291     BlockDriver *proto_drv;
1292     BlockDriver *drv = NULL;
1293     Error *local_err = NULL;
1294     int flags;
1295     uint64_t size;
1296     int ret;
1297
1298     if (!has_speed) {
1299         speed = 0;
1300     }
1301     if (!has_on_source_error) {
1302         on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1303     }
1304     if (!has_on_target_error) {
1305         on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1306     }
1307     if (!has_mode) {
1308         mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1309     }
1310     if (!has_granularity) {
1311         granularity = 0;
1312     }
1313     if (!has_buf_size) {
1314         buf_size = DEFAULT_MIRROR_BUF_SIZE;
1315     }
1316
1317     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1318         error_set(errp, QERR_INVALID_PARAMETER, device);
1319         return;
1320     }
1321     if (granularity & (granularity - 1)) {
1322         error_set(errp, QERR_INVALID_PARAMETER, device);
1323         return;
1324     }
1325
1326     bs = bdrv_find(device);
1327     if (!bs) {
1328         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1329         return;
1330     }
1331
1332     if (!bdrv_is_inserted(bs)) {
1333         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1334         return;
1335     }
1336
1337     if (!has_format) {
1338         format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1339     }
1340     if (format) {
1341         drv = bdrv_find_format(format);
1342         if (!drv) {
1343             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1344             return;
1345         }
1346     }
1347
1348     if (bdrv_in_use(bs)) {
1349         error_set(errp, QERR_DEVICE_IN_USE, device);
1350         return;
1351     }
1352
1353     flags = bs->open_flags | BDRV_O_RDWR;
1354     source = bs->backing_hd;
1355     if (!source && sync == MIRROR_SYNC_MODE_TOP) {
1356         sync = MIRROR_SYNC_MODE_FULL;
1357     }
1358
1359     proto_drv = bdrv_find_protocol(target);
1360     if (!proto_drv) {
1361         error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1362         return;
1363     }
1364
1365     bdrv_get_geometry(bs, &size);
1366     size *= 512;
1367     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
1368         /* create new image w/o backing file */
1369         assert(format && drv);
1370         bdrv_img_create(target, format,
1371                         NULL, NULL, NULL, size, flags, &local_err, false);
1372     } else {
1373         switch (mode) {
1374         case NEW_IMAGE_MODE_EXISTING:
1375             ret = 0;
1376             break;
1377         case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
1378             /* create new image with backing file */
1379             bdrv_img_create(target, format,
1380                             source->filename,
1381                             source->drv->format_name,
1382                             NULL, size, flags, &local_err, false);
1383             break;
1384         default:
1385             abort();
1386         }
1387     }
1388
1389     if (error_is_set(&local_err)) {
1390         error_propagate(errp, local_err);
1391         return;
1392     }
1393
1394     /* Mirroring takes care of copy-on-write using the source's backing
1395      * file.
1396      */
1397     target_bs = bdrv_new("");
1398     ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
1399
1400     if (ret < 0) {
1401         bdrv_delete(target_bs);
1402         error_set(errp, QERR_OPEN_FILE_FAILED, target);
1403         return;
1404     }
1405
1406     mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1407                  on_source_error, on_target_error,
1408                  block_job_cb, bs, &local_err);
1409     if (local_err != NULL) {
1410         bdrv_delete(target_bs);
1411         error_propagate(errp, local_err);
1412         return;
1413     }
1414
1415     /* Grab a reference so hotplug does not delete the BlockDriverState from
1416      * underneath us.
1417      */
1418     drive_get_ref(drive_get_by_blockdev(bs));
1419 }
1420
1421 static BlockJob *find_block_job(const char *device)
1422 {
1423     BlockDriverState *bs;
1424
1425     bs = bdrv_find(device);
1426     if (!bs || !bs->job) {
1427         return NULL;
1428     }
1429     return bs->job;
1430 }
1431
1432 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1433 {
1434     BlockJob *job = find_block_job(device);
1435
1436     if (!job) {
1437         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1438         return;
1439     }
1440
1441     block_job_set_speed(job, speed, errp);
1442 }
1443
1444 void qmp_block_job_cancel(const char *device,
1445                           bool has_force, bool force, Error **errp)
1446 {
1447     BlockJob *job = find_block_job(device);
1448
1449     if (!has_force) {
1450         force = false;
1451     }
1452
1453     if (!job) {
1454         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1455         return;
1456     }
1457     if (job->paused && !force) {
1458         error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
1459         return;
1460     }
1461
1462     trace_qmp_block_job_cancel(job);
1463     block_job_cancel(job);
1464 }
1465
1466 void qmp_block_job_pause(const char *device, Error **errp)
1467 {
1468     BlockJob *job = find_block_job(device);
1469
1470     if (!job) {
1471         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1472         return;
1473     }
1474
1475     trace_qmp_block_job_pause(job);
1476     block_job_pause(job);
1477 }
1478
1479 void qmp_block_job_resume(const char *device, Error **errp)
1480 {
1481     BlockJob *job = find_block_job(device);
1482
1483     if (!job) {
1484         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1485         return;
1486     }
1487
1488     trace_qmp_block_job_resume(job);
1489     block_job_resume(job);
1490 }
1491
1492 void qmp_block_job_complete(const char *device, Error **errp)
1493 {
1494     BlockJob *job = find_block_job(device);
1495
1496     if (!job) {
1497         error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1498         return;
1499     }
1500
1501     trace_qmp_block_job_complete(job);
1502     block_job_complete(job, errp);
1503 }
1504
1505 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1506 {
1507     BlockJobInfoList **prev = opaque;
1508     BlockJob *job = bs->job;
1509
1510     if (job) {
1511         BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
1512         elem->value = block_job_query(bs->job);
1513         (*prev)->next = elem;
1514         *prev = elem;
1515     }
1516 }
1517
1518 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1519 {
1520     /* Dummy is a fake list element for holding the head pointer */
1521     BlockJobInfoList dummy = {};
1522     BlockJobInfoList *prev = &dummy;
1523     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1524     return dummy.next;
1525 }
1526
1527 QemuOptsList qemu_common_drive_opts = {
1528     .name = "drive",
1529     .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
1530     .desc = {
1531         {
1532             .name = "bus",
1533             .type = QEMU_OPT_NUMBER,
1534             .help = "bus number",
1535         },{
1536             .name = "unit",
1537             .type = QEMU_OPT_NUMBER,
1538             .help = "unit number (i.e. lun for scsi)",
1539         },{
1540             .name = "if",
1541             .type = QEMU_OPT_STRING,
1542             .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
1543         },{
1544             .name = "index",
1545             .type = QEMU_OPT_NUMBER,
1546             .help = "index number",
1547         },{
1548             .name = "cyls",
1549             .type = QEMU_OPT_NUMBER,
1550             .help = "number of cylinders (ide disk geometry)",
1551         },{
1552             .name = "heads",
1553             .type = QEMU_OPT_NUMBER,
1554             .help = "number of heads (ide disk geometry)",
1555         },{
1556             .name = "secs",
1557             .type = QEMU_OPT_NUMBER,
1558             .help = "number of sectors (ide disk geometry)",
1559         },{
1560             .name = "trans",
1561             .type = QEMU_OPT_STRING,
1562             .help = "chs translation (auto, lba. none)",
1563         },{
1564             .name = "media",
1565             .type = QEMU_OPT_STRING,
1566             .help = "media type (disk, cdrom)",
1567         },{
1568             .name = "snapshot",
1569             .type = QEMU_OPT_BOOL,
1570             .help = "enable/disable snapshot mode",
1571         },{
1572             .name = "file",
1573             .type = QEMU_OPT_STRING,
1574             .help = "disk image",
1575         },{
1576             .name = "discard",
1577             .type = QEMU_OPT_STRING,
1578             .help = "discard operation (ignore/off, unmap/on)",
1579         },{
1580             .name = "cache",
1581             .type = QEMU_OPT_STRING,
1582             .help = "host cache usage (none, writeback, writethrough, "
1583                     "directsync, unsafe)",
1584         },{
1585             .name = "aio",
1586             .type = QEMU_OPT_STRING,
1587             .help = "host AIO implementation (threads, native)",
1588         },{
1589             .name = "format",
1590             .type = QEMU_OPT_STRING,
1591             .help = "disk format (raw, qcow2, ...)",
1592         },{
1593             .name = "serial",
1594             .type = QEMU_OPT_STRING,
1595             .help = "disk serial number",
1596         },{
1597             .name = "rerror",
1598             .type = QEMU_OPT_STRING,
1599             .help = "read error action",
1600         },{
1601             .name = "werror",
1602             .type = QEMU_OPT_STRING,
1603             .help = "write error action",
1604         },{
1605             .name = "addr",
1606             .type = QEMU_OPT_STRING,
1607             .help = "pci address (virtio only)",
1608         },{
1609             .name = "readonly",
1610             .type = QEMU_OPT_BOOL,
1611             .help = "open drive file as read-only",
1612         },{
1613             .name = "iops",
1614             .type = QEMU_OPT_NUMBER,
1615             .help = "limit total I/O operations per second",
1616         },{
1617             .name = "iops_rd",
1618             .type = QEMU_OPT_NUMBER,
1619             .help = "limit read operations per second",
1620         },{
1621             .name = "iops_wr",
1622             .type = QEMU_OPT_NUMBER,
1623             .help = "limit write operations per second",
1624         },{
1625             .name = "bps",
1626             .type = QEMU_OPT_NUMBER,
1627             .help = "limit total bytes per second",
1628         },{
1629             .name = "bps_rd",
1630             .type = QEMU_OPT_NUMBER,
1631             .help = "limit read bytes per second",
1632         },{
1633             .name = "bps_wr",
1634             .type = QEMU_OPT_NUMBER,
1635             .help = "limit write bytes per second",
1636         },{
1637             .name = "copy-on-read",
1638             .type = QEMU_OPT_BOOL,
1639             .help = "copy read data from backing file into image file",
1640         },{
1641             .name = "boot",
1642             .type = QEMU_OPT_BOOL,
1643             .help = "(deprecated, ignored)",
1644         },
1645         { /* end of list */ }
1646     },
1647 };
1648
1649 QemuOptsList qemu_drive_opts = {
1650     .name = "drive",
1651     .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
1652     .desc = {
1653         /*
1654          * no elements => accept any params
1655          * validation will happen later
1656          */
1657         { /* end of list */ }
1658     },
1659 };