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