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 "sysemu.h"
  17
  18 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
  19
  20 /*
  21  * We automatically delete the drive when a device using it gets
  22  * unplugged.  Questionable feature, but we can't just drop it.
  23  * Device models call blockdev_mark_auto_del() to schedule the
  24  * automatic deletion, and generic qdev code calls blockdev_auto_del()
  25  * when deletion is actually safe.
  26  */
  27 void blockdev_mark_auto_del(BlockDriverState *bs)
  28 {
  29     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  30
  31     dinfo->auto_del = 1;
  32 }
  33
  34 void blockdev_auto_del(BlockDriverState *bs)
  35 {
  36     DriveInfo *dinfo = drive_get_by_blockdev(bs);
  37
  38     if (dinfo->auto_del) {
  39         drive_uninit(dinfo);
  40     }
  41 }
  42
  43 QemuOpts *drive_add(const char *file, const char *fmt, ...)
  44 {
  45     va_list ap;
  46     char optstr[1024];
  47     QemuOpts *opts;
  48
  49     va_start(ap, fmt);
  50     vsnprintf(optstr, sizeof(optstr), fmt, ap);
  51     va_end(ap);
  52
  53     opts = qemu_opts_parse(&qemu_drive_opts, optstr, 0);
  54     if (!opts) {
  55         return NULL;
  56     }
  57     if (file)
  58         qemu_opt_set(opts, "file", file);
  59     return opts;
  60 }
  61
  62 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
  63 {
  64     DriveInfo *dinfo;
  65
  66     /* seek interface, bus and unit */
  67
  68     QTAILQ_FOREACH(dinfo, &drives, next) {
  69         if (dinfo->type == type &&
  70             dinfo->bus == bus &&
  71             dinfo->unit == unit)
  72             return dinfo;
  73     }
  74
  75     return NULL;
  76 }
  77
  78 int drive_get_max_bus(BlockInterfaceType type)
  79 {
  80     int max_bus;
  81     DriveInfo *dinfo;
  82
  83     max_bus = -1;
  84     QTAILQ_FOREACH(dinfo, &drives, next) {
  85         if(dinfo->type == type &&
  86            dinfo->bus > max_bus)
  87             max_bus = dinfo->bus;
  88     }
  89     return max_bus;
  90 }
  91
  92 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
  93 {
  94     DriveInfo *dinfo;
  95
  96     QTAILQ_FOREACH(dinfo, &drives, next) {
  97         if (dinfo->bdrv == bs) {
  98             return dinfo;
  99         }
 100     }
 101     return NULL;
 102 }
 103
 104 static void bdrv_format_print(void *opaque, const char *name)
 105 {
 106     fprintf(stderr, " %s", name);
 107 }
 108
 109 void drive_uninit(DriveInfo *dinfo)
 110 {
 111     qemu_opts_del(dinfo->opts);
 112     bdrv_delete(dinfo->bdrv);
 113     QTAILQ_REMOVE(&drives, dinfo, next);
 114     qemu_free(dinfo);
 115 }
 116
 117 static int parse_block_error_action(const char *buf, int is_read)
 118 {
 119     if (!strcmp(buf, "ignore")) {
 120         return BLOCK_ERR_IGNORE;
 121     } else if (!is_read && !strcmp(buf, "enospc")) {
 122         return BLOCK_ERR_STOP_ENOSPC;
 123     } else if (!strcmp(buf, "stop")) {
 124         return BLOCK_ERR_STOP_ANY;
 125     } else if (!strcmp(buf, "report")) {
 126         return BLOCK_ERR_REPORT;
 127     } else {
 128         fprintf(stderr, "qemu: '%s' invalid %s error action\n",
 129             buf, is_read ? "read" : "write");
 130         return -1;
 131     }
 132 }
 133
 134 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
 135 {
 136     const char *buf;
 137     const char *file = NULL;
 138     char devname[128];
 139     const char *serial;
 140     const char *mediastr = "";
 141     BlockInterfaceType type;
 142     enum { MEDIA_DISK, MEDIA_CDROM } media;
 143     int bus_id, unit_id;
 144     int cyls, heads, secs, translation;
 145     BlockDriver *drv = NULL;
 146     int max_devs;
 147     int index;
 148     int ro = 0;
 149     int bdrv_flags = 0;
 150     int on_read_error, on_write_error;
 151     const char *devaddr;
 152     DriveInfo *dinfo;
 153     int snapshot = 0;
 154     int ret;
 155
 156     *fatal_error = 1;
 157
 158     translation = BIOS_ATA_TRANSLATION_AUTO;
 159
 160     if (default_to_scsi) {
 161         type = IF_SCSI;
 162         max_devs = MAX_SCSI_DEVS;
 163         pstrcpy(devname, sizeof(devname), "scsi");
 164     } else {
 165         type = IF_IDE;
 166         max_devs = MAX_IDE_DEVS;
 167         pstrcpy(devname, sizeof(devname), "ide");
 168     }
 169     media = MEDIA_DISK;
 170
 171     /* extract parameters */
 172     bus_id  = qemu_opt_get_number(opts, "bus", 0);
 173     unit_id = qemu_opt_get_number(opts, "unit", -1);
 174     index   = qemu_opt_get_number(opts, "index", -1);
 175
 176     cyls  = qemu_opt_get_number(opts, "cyls", 0);
 177     heads = qemu_opt_get_number(opts, "heads", 0);
 178     secs  = qemu_opt_get_number(opts, "secs", 0);
 179
 180     snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
 181     ro = qemu_opt_get_bool(opts, "readonly", 0);
 182
 183     file = qemu_opt_get(opts, "file");
 184     serial = qemu_opt_get(opts, "serial");
 185
 186     if ((buf = qemu_opt_get(opts, "if")) != NULL) {
 187         pstrcpy(devname, sizeof(devname), buf);
 188         if (!strcmp(buf, "ide")) {
 189             type = IF_IDE;
 190             max_devs = MAX_IDE_DEVS;
 191         } else if (!strcmp(buf, "scsi")) {
 192             type = IF_SCSI;
 193             max_devs = MAX_SCSI_DEVS;
 194         } else if (!strcmp(buf, "floppy")) {
 195             type = IF_FLOPPY;
 196             max_devs = 0;
 197         } else if (!strcmp(buf, "pflash")) {
 198             type = IF_PFLASH;
 199             max_devs = 0;
 200         } else if (!strcmp(buf, "mtd")) {
 201             type = IF_MTD;
 202             max_devs = 0;
 203         } else if (!strcmp(buf, "sd")) {
 204             type = IF_SD;
 205             max_devs = 0;
 206         } else if (!strcmp(buf, "virtio")) {
 207             type = IF_VIRTIO;
 208             max_devs = 0;
 209         } else if (!strcmp(buf, "xen")) {
 210             type = IF_XEN;
 211             max_devs = 0;
 212         } else if (!strcmp(buf, "none")) {
 213             type = IF_NONE;
 214             max_devs = 0;
 215         } else {
 216             fprintf(stderr, "qemu: unsupported bus type '%s'\n", buf);
 217             return NULL;
 218         }
 219     }
 220
 221     if (cyls || heads || secs) {
 222         if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
 223             fprintf(stderr, "qemu: '%s' invalid physical cyls number\n", buf);
 224             return NULL;
 225         }
 226         if (heads < 1 || (type == IF_IDE && heads > 16)) {
 227             fprintf(stderr, "qemu: '%s' invalid physical heads number\n", buf);
 228             return NULL;
 229         }
 230         if (secs < 1 || (type == IF_IDE && secs > 63)) {
 231             fprintf(stderr, "qemu: '%s' invalid physical secs number\n", buf);
 232             return NULL;
 233         }
 234     }
 235
 236     if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
 237         if (!cyls) {
 238             fprintf(stderr,
 239                     "qemu: '%s' trans must be used with cyls,heads and secs\n",
 240                     buf);
 241             return NULL;
 242         }
 243         if (!strcmp(buf, "none"))
 244             translation = BIOS_ATA_TRANSLATION_NONE;
 245         else if (!strcmp(buf, "lba"))
 246             translation = BIOS_ATA_TRANSLATION_LBA;
 247         else if (!strcmp(buf, "auto"))
 248             translation = BIOS_ATA_TRANSLATION_AUTO;
 249         else {
 250             fprintf(stderr, "qemu: '%s' invalid translation type\n", buf);
 251             return NULL;
 252         }
 253     }
 254
 255     if ((buf = qemu_opt_get(opts, "media")) != NULL) {
 256         if (!strcmp(buf, "disk")) {
 257             media = MEDIA_DISK;
 258         } else if (!strcmp(buf, "cdrom")) {
 259             if (cyls || secs || heads) {
 260                 fprintf(stderr,
 261                         "qemu: '%s' invalid physical CHS format\n", buf);
 262                 return NULL;
 263             }
 264             media = MEDIA_CDROM;
 265         } else {
 266             fprintf(stderr, "qemu: '%s' invalid media\n", buf);
 267             return NULL;
 268         }
 269     }
 270
 271     if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
 272         if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
 273             bdrv_flags |= BDRV_O_NOCACHE;
 274         } else if (!strcmp(buf, "writeback")) {
 275             bdrv_flags |= BDRV_O_CACHE_WB;
 276         } else if (!strcmp(buf, "unsafe")) {
 277             bdrv_flags |= BDRV_O_CACHE_WB;
 278             bdrv_flags |= BDRV_O_NO_FLUSH;
 279         } else if (!strcmp(buf, "writethrough")) {
 280             /* this is the default */
 281         } else {
 282            fprintf(stderr, "qemu: invalid cache option\n");
 283            return NULL;
 284         }
 285     }
 286
 287 #ifdef CONFIG_LINUX_AIO
 288     if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
 289         if (!strcmp(buf, "native")) {
 290             bdrv_flags |= BDRV_O_NATIVE_AIO;
 291         } else if (!strcmp(buf, "threads")) {
 292             /* this is the default */
 293         } else {
 294            fprintf(stderr, "qemu: invalid aio option\n");
 295            return NULL;
 296         }
 297     }
 298 #endif
 299
 300     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
 301        if (strcmp(buf, "?") == 0) {
 302             fprintf(stderr, "qemu: Supported formats:");
 303             bdrv_iterate_format(bdrv_format_print, NULL);
 304             fprintf(stderr, "\n");
 305             return NULL;
 306         }
 307         drv = bdrv_find_whitelisted_format(buf);
 308         if (!drv) {
 309             fprintf(stderr, "qemu: '%s' invalid format\n", buf);
 310             return NULL;
 311         }
 312     }
 313
 314     on_write_error = BLOCK_ERR_STOP_ENOSPC;
 315     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
 316         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
 317             fprintf(stderr, "werror is no supported by this format\n");
 318             return NULL;
 319         }
 320
 321         on_write_error = parse_block_error_action(buf, 0);
 322         if (on_write_error < 0) {
 323             return NULL;
 324         }
 325     }
 326
 327     on_read_error = BLOCK_ERR_REPORT;
 328     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
 329         if (type != IF_IDE && type != IF_VIRTIO && type != IF_NONE) {
 330             fprintf(stderr, "rerror is no supported by this format\n");
 331             return NULL;
 332         }
 333
 334         on_read_error = parse_block_error_action(buf, 1);
 335         if (on_read_error < 0) {
 336             return NULL;
 337         }
 338     }
 339
 340     if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
 341         if (type != IF_VIRTIO) {
 342             fprintf(stderr, "addr is not supported\n");
 343             return NULL;
 344         }
 345     }
 346
 347     /* compute bus and unit according index */
 348
 349     if (index != -1) {
 350         if (bus_id != 0 || unit_id != -1) {
 351             fprintf(stderr,
 352                     "qemu: index cannot be used with bus and unit\n");
 353             return NULL;
 354         }
 355         if (max_devs == 0)
 356         {
 357             unit_id = index;
 358             bus_id = 0;
 359         } else {
 360             unit_id = index % max_devs;
 361             bus_id = index / max_devs;
 362         }
 363     }
 364
 365     /* if user doesn't specify a unit_id,
 366      * try to find the first free
 367      */
 368
 369     if (unit_id == -1) {
 370        unit_id = 0;
 371        while (drive_get(type, bus_id, unit_id) != NULL) {
 372            unit_id++;
 373            if (max_devs && unit_id >= max_devs) {
 374                unit_id -= max_devs;
 375                bus_id++;
 376            }
 377        }
 378     }
 379
 380     /* check unit id */
 381
 382     if (max_devs && unit_id >= max_devs) {
 383         fprintf(stderr, "qemu: unit %d too big (max is %d)\n",
 384                 unit_id, max_devs - 1);
 385         return NULL;
 386     }
 387
 388     /*
 389      * ignore multiple definitions
 390      */
 391
 392     if (drive_get(type, bus_id, unit_id) != NULL) {
 393         *fatal_error = 0;
 394         return NULL;
 395     }
 396
 397     /* init */
 398
 399     dinfo = qemu_mallocz(sizeof(*dinfo));
 400     if ((buf = qemu_opts_id(opts)) != NULL) {
 401         dinfo->id = qemu_strdup(buf);
 402     } else {
 403         /* no id supplied -> create one */
 404         dinfo->id = qemu_mallocz(32);
 405         if (type == IF_IDE || type == IF_SCSI)
 406             mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
 407         if (max_devs)
 408             snprintf(dinfo->id, 32, "%s%i%s%i",
 409                      devname, bus_id, mediastr, unit_id);
 410         else
 411             snprintf(dinfo->id, 32, "%s%s%i",
 412                      devname, mediastr, unit_id);
 413     }
 414     dinfo->bdrv = bdrv_new(dinfo->id);
 415     dinfo->devaddr = devaddr;
 416     dinfo->type = type;
 417     dinfo->bus = bus_id;
 418     dinfo->unit = unit_id;
 419     dinfo->opts = opts;
 420     if (serial)
 421         strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
 422     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 423
 424     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
 425
 426     switch(type) {
 427     case IF_IDE:
 428     case IF_SCSI:
 429     case IF_XEN:
 430     case IF_NONE:
 431         switch(media) {
 432         case MEDIA_DISK:
 433             if (cyls != 0) {
 434                 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
 435                 bdrv_set_translation_hint(dinfo->bdrv, translation);
 436             }
 437             break;
 438         case MEDIA_CDROM:
 439             bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
 440             break;
 441         }
 442         break;
 443     case IF_SD:
 444         /* FIXME: This isn't really a floppy, but it's a reasonable
 445            approximation.  */
 446     case IF_FLOPPY:
 447         bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
 448         break;
 449     case IF_PFLASH:
 450     case IF_MTD:
 451         break;
 452     case IF_VIRTIO:
 453         /* add virtio block device */
 454         opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
 455         qemu_opt_set(opts, "driver", "virtio-blk-pci");
 456         qemu_opt_set(opts, "drive", dinfo->id);
 457         if (devaddr)
 458             qemu_opt_set(opts, "addr", devaddr);
 459         break;
 460     case IF_COUNT:
 461         abort();
 462     }
 463     if (!file || !*file) {
 464         *fatal_error = 0;
 465         return NULL;
 466     }
 467     if (snapshot) {
 468         /* always use cache=unsafe with snapshot */
 469         bdrv_flags &= ~BDRV_O_CACHE_MASK;
 470         bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
 471     }
 472
 473     if (media == MEDIA_CDROM) {
 474         /* CDROM is fine for any interface, don't check.  */
 475         ro = 1;
 476     } else if (ro == 1) {
 477         if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
 478             fprintf(stderr, "qemu: readonly flag not supported for drive with this interface\n");
 479             return NULL;
 480         }
 481     }
 482
 483     bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
 484
 485     ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
 486     if (ret < 0) {
 487         fprintf(stderr, "qemu: could not open disk image %s: %s\n",
 488                         file, strerror(-ret));
 489         return NULL;
 490     }
 491
 492     if (bdrv_key_required(dinfo->bdrv))
 493         autostart = 0;
 494     *fatal_error = 0;
 495     return dinfo;
 496 }
 497
 498 void do_commit(Monitor *mon, const QDict *qdict)
 499 {
 500     const char *device = qdict_get_str(qdict, "device");
 501     BlockDriverState *bs;
 502
 503     if (!strcmp(device, "all")) {
 504         bdrv_commit_all();
 505     } else {
 506         bs = bdrv_find(device);
 507         if (!bs) {
 508             qerror_report(QERR_DEVICE_NOT_FOUND, device);
 509             return;
 510         }
 511         bdrv_commit(bs);
 512     }
 513 }
 514
 515 static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
 516 {
 517     if (!force) {
 518         if (!bdrv_is_removable(bs)) {
 519             qerror_report(QERR_DEVICE_NOT_REMOVABLE,
 520                            bdrv_get_device_name(bs));
 521             return -1;
 522         }
 523         if (bdrv_is_locked(bs)) {
 524             qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
 525             return -1;
 526         }
 527     }
 528     bdrv_close(bs);
 529     return 0;
 530 }
 531
 532 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
 533 {
 534     BlockDriverState *bs;
 535     int force = qdict_get_try_bool(qdict, "force", 0);
 536     const char *filename = qdict_get_str(qdict, "device");
 537
 538     bs = bdrv_find(filename);
 539     if (!bs) {
 540         qerror_report(QERR_DEVICE_NOT_FOUND, filename);
 541         return -1;
 542     }
 543     return eject_device(mon, bs, force);
 544 }
 545
 546 int do_block_set_passwd(Monitor *mon, const QDict *qdict,
 547                         QObject **ret_data)
 548 {
 549     BlockDriverState *bs;
 550     int err;
 551
 552     bs = bdrv_find(qdict_get_str(qdict, "device"));
 553     if (!bs) {
 554         qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
 555         return -1;
 556     }
 557
 558     err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
 559     if (err == -EINVAL) {
 560         qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
 561         return -1;
 562     } else if (err < 0) {
 563         qerror_report(QERR_INVALID_PASSWORD);
 564         return -1;
 565     }
 566
 567     return 0;
 568 }
 569
 570 int do_change_block(Monitor *mon, const char *device,
 571                     const char *filename, const char *fmt)
 572 {
 573     BlockDriverState *bs;
 574     BlockDriver *drv = NULL;
 575     int bdrv_flags;
 576
 577     bs = bdrv_find(device);
 578     if (!bs) {
 579         qerror_report(QERR_DEVICE_NOT_FOUND, device);
 580         return -1;
 581     }
 582     if (fmt) {
 583         drv = bdrv_find_whitelisted_format(fmt);
 584         if (!drv) {
 585             qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
 586             return -1;
 587         }
 588     }
 589     if (eject_device(mon, bs, 0) < 0) {
 590         return -1;
 591     }
 592     bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
 593     bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
 594     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
 595         qerror_report(QERR_OPEN_FILE_FAILED, filename);
 596         return -1;
 597     }
 598     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
 599 }