blockdev.c

   1 /*
   2  * QEMU host block devices
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or
   7  * later.  See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "block.h"
  11 #include "blockdev.h"
  12 #include "monitor.h"
  13 #include "qerror.h"
  14 #include "qemu-option.h"
  15 #include "qemu-config.h"
  16 #include "qemu-objects.h"
  17 #include "sysemu.h"
  18 #include "block_int.h"
  19 #include "qmp-commands.h"
  20 #include "trace.h"
  21 #include "arch_init.h"
  22
  23 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  24
  25 static const char *const if_name[IF_COUNT] = {
  26     [IF_NONE] = "none",
  27     [IF_IDE] = "ide",
  28     [IF_SCSI] = "scsi",
  29     [IF_FLOPPY] = "floppy",
  30     [IF_PFLASH] = "pflash",
  31     [IF_MTD] = "mtd",
  32     [IF_SD] = "sd",
  33     [IF_VIRTIO] = "virtio",
  34     [IF_XEN] = "xen",
  35 };
  36
  37 static const int if_max_devs[IF_COUNT] = {
  38     /*
  39      * Do not change these numbers!  They govern how drive option
  40      * index maps to unit and bus.  That mapping is ABI.
  41      *
  42      * All controllers used to imlement if=T drives need to support
  43      * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
  44      * Otherwise, some index values map to "impossible" bus, unit
  45      * values.
  46      *
  47      * For instance, if you change [IF_SCSI] to 255, -drive
  48      * if=scsi,index=12 no longer means bus=1,unit=5, but
  49      * bus=0,unit=12.  With an lsi53c895a controller (7 units max),
  50      * the drive can't be set up.  Regression.
  51      */
  52     [IF_IDE] = 2,
  53     [IF_SCSI] = 7,
  54 };
  55
  56 /*
  57  * We automatically delete the drive when a device using it gets
  58  * unplugged.  Questionable feature, but we can't just drop it.
  59  * Device models call blockdev_mark_auto_del() to schedule the
  60  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  61  * when deletion is actually safe.
  62  */
  63 void blockdev_mark_auto_del(BlockDriverState *bs)
  64 {
  65     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  66
  67     if (bs->job) {
  68         block_job_cancel(bs->job);
  69     }
  70     if (dinfo) {
  71         dinfo->auto_del = 1;
  72     }
  73 }
  74
  75 void blockdev_auto_del(BlockDriverState *bs)
  76 {
  77     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  78
  79     if (dinfo && dinfo->auto_del) {
  80         drive_put_ref(dinfo);
  81     }
  82 }
  83
  84 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
  85 {
  86     int max_devs = if_max_devs[type];
  87     return max_devs ? index / max_devs : 0;
  88 }
  89
  90 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
  91 {
  92     int max_devs = if_max_devs[type];
  93     return max_devs ? index % max_devs : index;
  94 }
  95
  96 QemuOpts *drive_def(const char *optstr)
  97 {
  98     return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
  99 }
 100
 101 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
 102                     const char *optstr)
 103 {
 104     QemuOpts *opts;
 105     char buf[32];
 106
 107     opts = drive_def(optstr);
 108     if (!opts) {
 109         return NULL;
 110     }
 111     if (type != IF_DEFAULT) {
 112         qemu_opt_set(opts, "if", if_name[type]);
 113     }
 114     if (index >= 0) {
 115         snprintf(buf, sizeof(buf), "%d", index);
 116         qemu_opt_set(opts, "index", buf);
 117     }
 118     if (file)
 119         qemu_opt_set(opts, "file", file);
 120     return opts;
 121 }
 122
 123 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
 124 {
 125     DriveInfo *dinfo;
 126
 127     /* seek interface, bus and unit */
 128
 129     QTAILQ_FOREACH(dinfo, &drives, next) {
 130         if (dinfo->type == type &&
 131             dinfo->bus == bus &&
 132             dinfo->unit == unit)
 133             return dinfo;
 134     }
 135
 136     return NULL;
 137 }
 138
 139 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
 140 {
 141     return drive_get(type,
 142                      drive_index_to_bus_id(type, index),
 143                      drive_index_to_unit_id(type, index));
 144 }
 145
 146 int drive_get_max_bus(BlockInterfaceType type)
 147 {
 148     int max_bus;
 149     DriveInfo *dinfo;
 150
 151     max_bus = -1;
 152     QTAILQ_FOREACH(dinfo, &drives, next) {
 153         if(dinfo->type == type &&
 154            dinfo->bus > max_bus)
 155             max_bus = dinfo->bus;
 156     }
 157     return max_bus;
 158 }
 159
 160 /* Get a block device.  This should only be used for single-drive devices
 161    (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
 162    appropriate bus.  */
 163 DriveInfo *drive_get_next(BlockInterfaceType type)
 164 {
 165     static int next_block_unit[IF_COUNT];
 166
 167     return drive_get(type, 0, next_block_unit[type]++);
 168 }
 169
 170 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
 171 {
 172     DriveInfo *dinfo;
 173
 174     QTAILQ_FOREACH(dinfo, &drives, next) {
 175         if (dinfo->bdrv == bs) {
 176             return dinfo;
 177         }
 178     }
 179     return NULL;
 180 }
 181
 182 static void bdrv_format_print(void *opaque, const char *name)
 183 {
 184     error_printf(" %s", name);
 185 }
 186
 187 static void drive_uninit(DriveInfo *dinfo)
 188 {
 189     qemu_opts_del(dinfo->opts);
 190     bdrv_delete(dinfo->bdrv);
 191     g_free(dinfo->id);
 192     QTAILQ_REMOVE(&drives, dinfo, next);
 193     g_free(dinfo);
 194 }
 195
 196 void drive_put_ref(DriveInfo *dinfo)
 197 {
 198     assert(dinfo->refcount);
 199     if (--dinfo->refcount == 0) {
 200         drive_uninit(dinfo);
 201     }
 202 }
 203
 204 void drive_get_ref(DriveInfo *dinfo)
 205 {
 206     dinfo->refcount++;
 207 }
 208
 209 typedef struct {
 210     QEMUBH *bh;
 211     DriveInfo *dinfo;
 212 } DrivePutRefBH;
 213
 214 static void drive_put_ref_bh(void *opaque)
 215 {
 216     DrivePutRefBH *s = opaque;
 217
 218     drive_put_ref(s->dinfo);
 219     qemu_bh_delete(s->bh);
 220     g_free(s);
 221 }
 222
 223 /*
 224  * Release a drive reference in a BH
 225  *
 226  * It is not possible to use drive_put_ref() from a callback function when the
 227  * callers still need the drive.  In such cases we schedule a BH to release the
 228  * reference.
 229  */
 230 static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
 231 {
 232     DrivePutRefBH *s;
 233
 234     s = g_new(DrivePutRefBH, 1);
 235     s->bh = qemu_bh_new(drive_put_ref_bh, s);
 236     s->dinfo = dinfo;
 237     qemu_bh_schedule(s->bh);
 238 }
 239
 240 static int parse_block_error_action(const char *buf, int is_read)
 241 {
 242     if (!strcmp(buf, "ignore")) {
 243         return BLOCK_ERR_IGNORE;
 244     } else if (!is_read && !strcmp(buf, "enospc")) {
 245         return BLOCK_ERR_STOP_ENOSPC;
 246     } else if (!strcmp(buf, "stop")) {
 247         return BLOCK_ERR_STOP_ANY;
 248     } else if (!strcmp(buf, "report")) {
 249         return BLOCK_ERR_REPORT;
 250     } else {
 251         error_report("'%s' invalid %s error action",
 252                      buf, is_read ? "read" : "write");
 253         return -1;
 254     }
 255 }
 256
 257 static bool do_check_io_limits(BlockIOLimit *io_limits)
 258 {
 259     bool bps_flag;
 260     bool iops_flag;
 261
 262     assert(io_limits);
 263
 264     bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
 265                  && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
 266                  || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
 267     iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
 268                  && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
 269                  || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
 270     if (bps_flag || iops_flag) {
 271         return false;
 272     }
 273
 274     return true;
 275 }
 276
 277 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
 278 {
 279     const char *buf;
 280     const char *file = NULL;
 281     char devname[128];
 282     const char *serial;
 283     const char *mediastr = "";
 284     BlockInterfaceType type;
 285     enum { MEDIA_DISK, MEDIA_CDROM } media;
 286     int bus_id, unit_id;
 287     int cyls, heads, secs, translation;
 288     BlockDriver *drv = NULL;
 289     int max_devs;
 290     int index;
 291     int ro = 0;
 292     int bdrv_flags = 0;
 293     int on_read_error, on_write_error;
 294     const char *devaddr;
 295     DriveInfo *dinfo;
 296     BlockIOLimit io_limits;
 297     int snapshot = 0;
 298     bool copy_on_read;
 299     int ret;
 300
 301     translation = BIOS_ATA_TRANSLATION_AUTO;
 302     media = MEDIA_DISK;
 303
 304     /* extract parameters */
 305     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 306     unit_id = qemu_opt_get_number(opts, "unit", -1);
 307     index   = qemu_opt_get_number(opts, "index", -1);
 308
 309     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 310     heads = qemu_opt_get_number(opts, "heads", 0);
 311     secs  = qemu_opt_get_number(opts, "secs", 0);
 312
 313     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 314     ro = qemu_opt_get_bool(opts, "readonly", 0);
 315     copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
 316
 317     file = qemu_opt_get(opts, "file");
 318     serial = qemu_opt_get(opts, "serial");
 319
 320     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 321         pstrcpy(devname, sizeof(devname), buf);
 322         for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
 323             ;
 324         if (type == IF_COUNT) {
 325             error_report("unsupported bus type '%s'", buf);
 326             return NULL;
 327         }
 328     } else {
 329         type = default_to_scsi ? IF_SCSI : IF_IDE;
 330         pstrcpy(devname, sizeof(devname), if_name[type]);
 331     }
 332
 333     max_devs = if_max_devs[type];
 334
 335     if (cyls || heads || secs) {
 336         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
 337             error_report("invalid physical cyls number");
 338             return NULL;
 339         }
 340         if (heads < 1 || (type == IF_IDE && heads > 16)) {
 341             error_report("invalid physical heads number");
 342             return NULL;
 343         }
 344         if (secs < 1 || (type == IF_IDE && secs > 63)) {
 345             error_report("invalid physical secs number");
 346             return NULL;
 347         }
 348     }
 349
 350     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 351         if (!cyls) {
 352             error_report("'%s' trans must be used with cyls, heads and secs",
 353                          buf);
 354             return NULL;
 355         }
 356         if (!strcmp(buf, "none"))
 357             translation = BIOS_ATA_TRANSLATION_NONE;
 358         else if (!strcmp(buf, "lba"))
 359             translation = BIOS_ATA_TRANSLATION_LBA;
 360         else if (!strcmp(buf, "auto"))
 361             translation = BIOS_ATA_TRANSLATION_AUTO;
 362         else {
 363             error_report("'%s' invalid translation type", buf);
 364             return NULL;
 365         }
 366     }
 367
 368     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 369         if (!strcmp(buf, "disk")) {
 370             media = MEDIA_DISK;
 371         } else if (!strcmp(buf, "cdrom")) {
 372             if (cyls || secs || heads) {
 373                 error_report("CHS can't be set with media=%s", buf);
 374                 return NULL;
 375             }
 376             media = MEDIA_CDROM;
 377         } else {
 378             error_report("'%s' invalid media", buf);
 379             return NULL;
 380         }
 381     }
 382
 383     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 384         if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
 385             error_report("invalid cache option");
 386             return NULL;
 387         }
 388     }
 389
 390 #ifdef CONFIG_LINUX_AIO
 391     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 392         if (!strcmp(buf, "native")) {
 393             bdrv_flags |= BDRV_O_NATIVE_AIO;
 394         } else if (!strcmp(buf, "threads")) {
 395             /* this is the default */
 396         } else {
 397            error_report("invalid aio option");
 398            return NULL;
 399         }
 400     }
 401 #endif
 402
 403     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 404        if (strcmp(buf, "?") == 0) {
 405            error_printf("Supported formats:");
 406            bdrv_iterate_format(bdrv_format_print, NULL);
 407            error_printf("\n");
 408            return NULL;
 409         }
 410         drv = bdrv_find_whitelisted_format(buf);
 411         if (!drv) {
 412             error_report("'%s' invalid format", buf);
 413             return NULL;
 414         }
 415     }
 416
 417     /* disk I/O throttling */
 418     io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
 419                            qemu_opt_get_number(opts, "bps", 0);
 420     io_limits.bps[BLOCK_IO_LIMIT_READ]   =
 421                            qemu_opt_get_number(opts, "bps_rd", 0);
 422     io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
 423                            qemu_opt_get_number(opts, "bps_wr", 0);
 424     io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
 425                            qemu_opt_get_number(opts, "iops", 0);
 426     io_limits.iops[BLOCK_IO_LIMIT_READ]  =
 427                            qemu_opt_get_number(opts, "iops_rd", 0);
 428     io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
 429                            qemu_opt_get_number(opts, "iops_wr", 0);
 430
 431     if (!do_check_io_limits(&io_limits)) {
 432         error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
 433                      "cannot be used at the same time");
 434         return NULL;
 435     }
 436
 437     on_write_error = BLOCK_ERR_STOP_ENOSPC;
 438     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 439         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 440             error_report("werror is not supported by this bus type");
 441             return NULL;
 442         }
 443
 444         on_write_error = parse_block_error_action(buf, 0);
 445         if (on_write_error < 0) {
 446             return NULL;
 447         }
 448     }
 449
 450     on_read_error = BLOCK_ERR_REPORT;
 451     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 452         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
 453             error_report("rerror is not supported by this bus type");
 454             return NULL;
 455         }
 456
 457         on_read_error = parse_block_error_action(buf, 1);
 458         if (on_read_error < 0) {
 459             return NULL;
 460         }
 461     }
 462
 463     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 464         if (type != IF_VIRTIO) {
 465             error_report("addr is not supported by this bus type");
 466             return NULL;
 467         }
 468     }
 469
 470     /* compute bus and unit according index */
 471
 472     if (index != -1) {
 473         if (bus_id != 0 || unit_id != -1) {
 474             error_report("index cannot be used with bus and unit");
 475             return NULL;
 476         }
 477         bus_id = drive_index_to_bus_id(type, index);
 478         unit_id = drive_index_to_unit_id(type, index);
 479     }
 480
 481     /* if user doesn't specify a unit_id,
 482      * try to find the first free
 483      */
 484
 485     if (unit_id == -1) {
 486        unit_id = 0;
 487        while (drive_get(type, bus_id, unit_id) != NULL) {
 488            unit_id++;
 489            if (max_devs && unit_id >= max_devs) {
 490                unit_id -= max_devs;
 491                bus_id++;
 492            }
 493        }
 494     }
 495
 496     /* check unit id */
 497
 498     if (max_devs && unit_id >= max_devs) {
 499         error_report("unit %d too big (max is %d)",
 500                      unit_id, max_devs - 1);
 501         return NULL;
 502     }
 503
 504     /*
 505      * catch multiple definitions
 506      */
 507
 508     if (drive_get(type, bus_id, unit_id) != NULL) {
 509         error_report("drive with bus=%d, unit=%d (index=%d) exists",
 510                      bus_id, unit_id, index);
 511         return NULL;
 512     }
 513
 514     /* init */
 515
 516     dinfo = g_malloc0(sizeof(*dinfo));
 517     if ((buf = qemu_opts_id(opts)) != NULL) {
 518         dinfo->id = g_strdup(buf);
 519     } else {
 520         /* no id supplied -> create one */
 521         dinfo->id = g_malloc0(32);
 522         if (type == IF_IDE || type == IF_SCSI)
 523             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 524         if (max_devs)
 525             snprintf(dinfo->id, 32, "%s%i%s%i",
 526                      devname, bus_id, mediastr, unit_id);
 527         else
 528             snprintf(dinfo->id, 32, "%s%s%i",
 529                      devname, mediastr, unit_id);
 530     }
 531     dinfo->bdrv = bdrv_new(dinfo->id);
 532     dinfo->devaddr = devaddr;
 533     dinfo->type = type;
 534     dinfo->bus = bus_id;
 535     dinfo->unit = unit_id;
 536     dinfo->opts = opts;
 537     dinfo->refcount = 1;
 538     if (serial) {
 539         pstrcpy(dinfo->serial, sizeof(dinfo->serial), serial);
 540     }
 541     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 542
 543     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 544
 545     /* disk I/O throttling */
 546     bdrv_set_io_limits(dinfo->bdrv, &io_limits);
 547
 548     switch(type) {
 549     case IF_IDE:
 550     case IF_SCSI:
 551     case IF_XEN:
 552     case IF_NONE:
 553         switch(media) {
 554         case MEDIA_DISK:
 555             if (cyls != 0) {
 556                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
 557                 bdrv_set_translation_hint(dinfo->bdrv, translation);
 558             }
 559             break;
 560         case MEDIA_CDROM:
 561             dinfo->media_cd = 1;
 562             break;
 563         }
 564         break;
 565     case IF_SD:
 566     case IF_FLOPPY:
 567     case IF_PFLASH:
 568     case IF_MTD:
 569         break;
 570     case IF_VIRTIO:
 571         /* add virtio block device */
 572         opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL);
 573         if (arch_type == QEMU_ARCH_S390X) {
 574             qemu_opt_set(opts, "driver", "virtio-blk-s390");
 575         } else {
 576             qemu_opt_set(opts, "driver", "virtio-blk-pci");
 577         }
 578         qemu_opt_set(opts, "drive", dinfo->id);
 579         if (devaddr)
 580             qemu_opt_set(opts, "addr", devaddr);
 581         break;
 582     default:
 583         abort();
 584     }
 585     if (!file || !*file) {
 586         return dinfo;
 587     }
 588     if (snapshot) {
 589         /* always use cache=unsafe with snapshot */
 590         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 591         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 592     }
 593
 594     if (copy_on_read) {
 595         bdrv_flags |= BDRV_O_COPY_ON_READ;
 596     }
 597
 598     if (runstate_check(RUN_STATE_INMIGRATE)) {
 599         bdrv_flags |= BDRV_O_INCOMING;
 600     }
 601
 602     if (media == MEDIA_CDROM) {
 603         /* CDROM is fine for any interface, don't check.  */
 604         ro = 1;
 605     } else if (ro == 1) {
 606         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
 607             type != IF_NONE && type != IF_PFLASH) {
 608             error_report("readonly not supported by this bus type");
 609             goto err;
 610         }
 611     }
 612
 613     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 614
 615     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 616     if (ret < 0) {
 617         error_report("could not open disk image %s: %s",
 618                      file, strerror(-ret));
 619         goto err;
 620     }
 621
 622     if (bdrv_key_required(dinfo->bdrv))
 623         autostart = 0;
 624     return dinfo;
 625
 626 err:
 627     bdrv_delete(dinfo->bdrv);
 628     g_free(dinfo->id);
 629     QTAILQ_REMOVE(&drives, dinfo, next);
 630     g_free(dinfo);
 631     return NULL;
 632 }
 633
 634 void do_commit(Monitor *mon, const QDict *qdict)
 635 {
 636     const char *device = qdict_get_str(qdict, "device");
 637     BlockDriverState *bs;
 638     int ret;
 639
 640     if (!strcmp(device, "all")) {
 641         ret = bdrv_commit_all();
 642         if (ret == -EBUSY) {
 643             qerror_report(QERR_DEVICE_IN_USE, device);
 644             return;
 645         }
 646     } else {
 647         bs = bdrv_find(device);
 648         if (!bs) {
 649             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 650             return;
 651         }
 652         ret = bdrv_commit(bs);
 653         if (ret == -EBUSY) {
 654             qerror_report(QERR_DEVICE_IN_USE, device);
 655             return;
 656         }
 657     }
 658 }
 659
 660 static void blockdev_do_action(int kind, void *data, Error **errp)
 661 {
 662     BlockdevAction action;
 663     BlockdevActionList list;
 664
 665     action.kind = kind;
 666     action.data = data;
 667     list.value = &action;
 668     list.next = NULL;
 669     qmp_transaction(&list, errp);
 670 }
 671
 672 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
 673                                 bool has_format, const char *format,
 674                                 bool has_mode, enum NewImageMode mode,
 675                                 Error **errp)
 676 {
 677     BlockdevSnapshot snapshot = {
 678         .device = (char *) device,
 679         .snapshot_file = (char *) snapshot_file,
 680         .has_format = has_format,
 681         .format = (char *) format,
 682         .has_mode = has_mode,
 683         .mode = mode,
 684     };
 685     blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
 686                        errp);
 687 }
 688
 689
 690 /* New and old BlockDriverState structs for group snapshots */
 691 typedef struct BlkTransactionStates {
 692     BlockDriverState *old_bs;
 693     BlockDriverState *new_bs;
 694     QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
 695 } BlkTransactionStates;
 696
 697 /*
 698  * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 699  *  then we do not pivot any of the devices in the group, and abandon the
 700  *  snapshots
 701  */
 702 void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
 703 {
 704     int ret = 0;
 705     BlockdevActionList *dev_entry = dev_list;
 706     BlkTransactionStates *states, *next;
 707
 708     QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
 709     QSIMPLEQ_INIT(&snap_bdrv_states);
 710
 711     /* drain all i/o before any snapshots */
 712     bdrv_drain_all();
 713
 714     /* We don't do anything in this loop that commits us to the snapshot */
 715     while (NULL != dev_entry) {
 716         BlockdevAction *dev_info = NULL;
 717         BlockDriver *proto_drv;
 718         BlockDriver *drv;
 719         int flags;
 720         enum NewImageMode mode;
 721         const char *new_image_file;
 722         const char *device;
 723         const char *format = "qcow2";
 724
 725         dev_info = dev_entry->value;
 726         dev_entry = dev_entry->next;
 727
 728         states = g_malloc0(sizeof(BlkTransactionStates));
 729         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);
 730
 731         switch (dev_info->kind) {
 732         case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
 733             device = dev_info->blockdev_snapshot_sync->device;
 734             if (!dev_info->blockdev_snapshot_sync->has_mode) {
 735                 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
 736             }
 737             new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file;
 738             if (dev_info->blockdev_snapshot_sync->has_format) {
 739                 format = dev_info->blockdev_snapshot_sync->format;
 740             }
 741             mode = dev_info->blockdev_snapshot_sync->mode;
 742             break;
 743         default:
 744             abort();
 745         }
 746
 747         drv = bdrv_find_format(format);
 748         if (!drv) {
 749             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 750             goto delete_and_fail;
 751         }
 752
 753         states->old_bs = bdrv_find(device);
 754         if (!states->old_bs) {
 755             error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 756             goto delete_and_fail;
 757         }
 758
 759         if (!bdrv_is_inserted(states->old_bs)) {
 760             error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
 761             goto delete_and_fail;
 762         }
 763
 764         if (bdrv_in_use(states->old_bs)) {
 765             error_set(errp, QERR_DEVICE_IN_USE, device);
 766             goto delete_and_fail;
 767         }
 768
 769         if (!bdrv_is_read_only(states->old_bs)) {
 770             if (bdrv_flush(states->old_bs)) {
 771                 error_set(errp, QERR_IO_ERROR);
 772                 goto delete_and_fail;
 773             }
 774         }
 775
 776         flags = states->old_bs->open_flags;
 777
 778         proto_drv = bdrv_find_protocol(new_image_file);
 779         if (!proto_drv) {
 780             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 781             goto delete_and_fail;
 782         }
 783
 784         /* create new image w/backing file */
 785         if (mode != NEW_IMAGE_MODE_EXISTING) {
 786             ret = bdrv_img_create(new_image_file, format,
 787                                   states->old_bs->filename,
 788                                   states->old_bs->drv->format_name,
 789                                   NULL, -1, flags);
 790             if (ret) {
 791                 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 792                 goto delete_and_fail;
 793             }
 794         }
 795
 796         /* We will manually add the backing_hd field to the bs later */
 797         states->new_bs = bdrv_new("");
 798         ret = bdrv_open(states->new_bs, new_image_file,
 799                         flags | BDRV_O_NO_BACKING, drv);
 800         if (ret != 0) {
 801             error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
 802             goto delete_and_fail;
 803         }
 804     }
 805
 806
 807     /* Now we are going to do the actual pivot.  Everything up to this point
 808      * is reversible, but we are committed at this point */
 809     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 810         /* This removes our old bs from the bdrv_states, and adds the new bs */
 811         bdrv_append(states->new_bs, states->old_bs);
 812     }
 813
 814     /* success */
 815     goto exit;
 816
 817 delete_and_fail:
 818     /*
 819     * failure, and it is all-or-none; abandon each new bs, and keep using
 820     * the original bs for all images
 821     */
 822     QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
 823         if (states->new_bs) {
 824              bdrv_delete(states->new_bs);
 825         }
 826     }
 827 exit:
 828     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
 829         g_free(states);
 830     }
 831     return;
 832 }
 833
 834
 835 static void eject_device(BlockDriverState *bs, int force, Error **errp)
 836 {
 837     if (bdrv_in_use(bs)) {
 838         error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
 839         return;
 840     }
 841     if (!bdrv_dev_has_removable_media(bs)) {
 842         error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
 843         return;
 844     }
 845
 846     if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
 847         bdrv_dev_eject_request(bs, force);
 848         if (!force) {
 849             error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 850             return;
 851         }
 852     }
 853
 854     bdrv_close(bs);
 855 }
 856
 857 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
 858 {
 859     BlockDriverState *bs;
 860
 861     bs = bdrv_find(device);
 862     if (!bs) {
 863         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 864         return;
 865     }
 866
 867     eject_device(bs, force, errp);
 868 }
 869
 870 void qmp_block_passwd(const char *device, const char *password, Error **errp)
 871 {
 872     BlockDriverState *bs;
 873     int err;
 874
 875     bs = bdrv_find(device);
 876     if (!bs) {
 877         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 878         return;
 879     }
 880
 881     err = bdrv_set_key(bs, password);
 882     if (err == -EINVAL) {
 883         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 884         return;
 885     } else if (err < 0) {
 886         error_set(errp, QERR_INVALID_PASSWORD);
 887         return;
 888     }
 889 }
 890
 891 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 892                                     int bdrv_flags, BlockDriver *drv,
 893                                     const char *password, Error **errp)
 894 {
 895     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 896         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
 897         return;
 898     }
 899
 900     if (bdrv_key_required(bs)) {
 901         if (password) {
 902             if (bdrv_set_key(bs, password) < 0) {
 903                 error_set(errp, QERR_INVALID_PASSWORD);
 904             }
 905         } else {
 906             error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
 907                       bdrv_get_encrypted_filename(bs));
 908         }
 909     } else if (password) {
 910         error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 911     }
 912 }
 913
 914 void qmp_change_blockdev(const char *device, const char *filename,
 915                          bool has_format, const char *format, Error **errp)
 916 {
 917     BlockDriverState *bs;
 918     BlockDriver *drv = NULL;
 919     int bdrv_flags;
 920     Error *err = NULL;
 921
 922     bs = bdrv_find(device);
 923     if (!bs) {
 924         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 925         return;
 926     }
 927
 928     if (format) {
 929         drv = bdrv_find_whitelisted_format(format);
 930         if (!drv) {
 931             error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
 932             return;
 933         }
 934     }
 935
 936     eject_device(bs, 0, &err);
 937     if (error_is_set(&err)) {
 938         error_propagate(errp, err);
 939         return;
 940     }
 941
 942     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 943     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 944
 945     qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
 946 }
 947
 948 /* throttling disk I/O limits */
 949 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
 950                                int64_t bps_wr, int64_t iops, int64_t iops_rd,
 951                                int64_t iops_wr, Error **errp)
 952 {
 953     BlockIOLimit io_limits;
 954     BlockDriverState *bs;
 955
 956     bs = bdrv_find(device);
 957     if (!bs) {
 958         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
 959         return;
 960     }
 961
 962     io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
 963     io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
 964     io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
 965     io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
 966     io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
 967     io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
 968
 969     if (!do_check_io_limits(&io_limits)) {
 970         error_set(errp, QERR_INVALID_PARAMETER_COMBINATION);
 971         return;
 972     }
 973
 974     bs->io_limits = io_limits;
 975     bs->slice_time = BLOCK_IO_SLICE_TIME;
 976
 977     if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
 978         bdrv_io_limits_enable(bs);
 979     } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
 980         bdrv_io_limits_disable(bs);
 981     } else {
 982         if (bs->block_timer) {
 983             qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
 984         }
 985     }
 986 }
 987
 988 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
 989 {
 990     const char *id = qdict_get_str(qdict, "id");
 991     BlockDriverState *bs;
 992
 993     bs = bdrv_find(id);
 994     if (!bs) {
 995         qerror_report(QERR_DEVICE_NOT_FOUND, id);
 996         return -1;
 997     }
 998     if (bdrv_in_use(bs)) {
 999         qerror_report(QERR_DEVICE_IN_USE, id);
1000         return -1;
1001     }
1002
1003     /* quiesce block driver; prevent further io */
1004     bdrv_drain_all();
1005     bdrv_flush(bs);
1006     bdrv_close(bs);
1007
1008     /* if we have a device attached to this BlockDriverState
1009      * then we need to make the drive anonymous until the device
1010      * can be removed.  If this is a drive with no device backing
1011      * then we can just get rid of the block driver state right here.
1012      */
1013     if (bdrv_get_attached_dev(bs)) {
1014         bdrv_make_anon(bs);
1015     } else {
1016         drive_uninit(drive_get_by_blockdev(bs));
1017     }
1018
1019     return 0;
1020 }
1021
1022 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1023 {
1024     BlockDriverState *bs;
1025
1026     bs = bdrv_find(device);
1027     if (!bs) {
1028         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1029         return;
1030     }
1031
1032     if (size < 0) {
1033         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1034         return;
1035     }
1036
1037     switch (bdrv_truncate(bs, size)) {
1038     case 0:
1039         break;
1040     case -ENOMEDIUM:
1041         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1042         break;
1043     case -ENOTSUP:
1044         error_set(errp, QERR_UNSUPPORTED);
1045         break;
1046     case -EACCES:
1047         error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1048         break;
1049     case -EBUSY:
1050         error_set(errp, QERR_DEVICE_IN_USE, device);
1051         break;
1052     default:
1053         error_set(errp, QERR_UNDEFINED_ERROR);
1054         break;
1055     }
1056 }
1057
1058 static QObject *qobject_from_block_job(BlockJob *job)
1059 {
1060     return qobject_from_jsonf("{ 'type': %s,"
1061                               "'device': %s,"
1062                               "'len': %" PRId64 ","
1063                               "'offset': %" PRId64 ","
1064                               "'speed': %" PRId64 " }",
1065                               job->job_type->job_type,
1066                               bdrv_get_device_name(job->bs),
1067                               job->len,
1068                               job->offset,
1069                               job->speed);
1070 }
1071
1072 static void block_stream_cb(void *opaque, int ret)
1073 {
1074     BlockDriverState *bs = opaque;
1075     QObject *obj;
1076
1077     trace_block_stream_cb(bs, bs->job, ret);
1078
1079     assert(bs->job);
1080     obj = qobject_from_block_job(bs->job);
1081     if (ret < 0) {
1082         QDict *dict = qobject_to_qdict(obj);
1083         qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1084     }
1085
1086     if (block_job_is_cancelled(bs->job)) {
1087         monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1088     } else {
1089         monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1090     }
1091     qobject_decref(obj);
1092
1093     drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
1094 }
1095
1096 void qmp_block_stream(const char *device, bool has_base,
1097                       const char *base, bool has_speed,
1098                       int64_t speed, Error **errp)
1099 {
1100     BlockDriverState *bs;
1101     BlockDriverState *base_bs = NULL;
1102     Error *local_err = NULL;
1103
1104     bs = bdrv_find(device);
1105     if (!bs) {
1106         error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1107         return;
1108     }
1109
1110     if (base) {
1111         base_bs = bdrv_find_backing_image(bs, base);
1112         if (base_bs == NULL) {
1113             error_set(errp, QERR_BASE_NOT_FOUND, base);
1114             return;
1115         }
1116     }
1117
1118     stream_start(bs, base_bs, base, has_speed ? speed : 0,
1119                  block_stream_cb, bs, &local_err);
1120     if (error_is_set(&local_err)) {
1121         error_propagate(errp, local_err);
1122         return;
1123     }
1124
1125     /* Grab a reference so hotplug does not delete the BlockDriverState from
1126      * underneath us.
1127      */
1128     drive_get_ref(drive_get_by_blockdev(bs));
1129
1130     trace_qmp_block_stream(bs, bs->job);
1131 }
1132
1133 static BlockJob *find_block_job(const char *device)
1134 {
1135     BlockDriverState *bs;
1136
1137     bs = bdrv_find(device);
1138     if (!bs || !bs->job) {
1139         return NULL;
1140     }
1141     return bs->job;
1142 }
1143
1144 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1145 {
1146     BlockJob *job = find_block_job(device);
1147
1148     if (!job) {
1149         error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
1150         return;
1151     }
1152
1153     block_job_set_speed(job, speed, errp);
1154 }
1155
1156 void qmp_block_job_cancel(const char *device, Error **errp)
1157 {
1158     BlockJob *job = find_block_job(device);
1159
1160     if (!job) {
1161         error_set(errp, QERR_DEVICE_NOT_ACTIVE, device);
1162         return;
1163     }
1164
1165     trace_qmp_block_job_cancel(job);
1166     block_job_cancel(job);
1167 }
1168
1169 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
1170 {
1171     BlockJobInfoList **prev = opaque;
1172     BlockJob *job = bs->job;
1173
1174     if (job) {
1175         BlockJobInfoList *elem;
1176         BlockJobInfo *info = g_new(BlockJobInfo, 1);
1177         *info = (BlockJobInfo){
1178             .type   = g_strdup(job->job_type->job_type),
1179             .device = g_strdup(bdrv_get_device_name(bs)),
1180             .len    = job->len,
1181             .offset = job->offset,
1182             .speed  = job->speed,
1183         };
1184
1185         elem = g_new0(BlockJobInfoList, 1);
1186         elem->value = info;
1187
1188         (*prev)->next = elem;
1189         *prev = elem;
1190     }
1191 }
1192
1193 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
1194 {
1195     /* Dummy is a fake list element for holding the head pointer */
1196     BlockJobInfoList dummy = {};
1197     BlockJobInfoList *prev = &dummy;
1198     bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
1199     return dummy.next;
1200 }