block/raw-format.c

   1 /* BlockDriver implementation for "raw" format driver
   2  *
   3  * Copyright (C) 2010-2016 Red Hat, Inc.
   4  * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com>
   5  * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com>
   6  *
   7  * Author:
   8  *   Laszlo Ersek <lersek@redhat.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to
  12  * deal in the Software without restriction, including without limitation the
  13  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  14  * sell copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  26  * IN THE SOFTWARE.
  27  */
  28
  29 #include "qemu/osdep.h"
  30 #include "block/block-io.h"
  31 #include "block/block_int.h"
  32 #include "qapi/error.h"
  33 #include "qemu/module.h"
  34 #include "qemu/option.h"
  35 #include "qemu/memalign.h"
  36
  37 typedef struct BDRVRawState {
  38     uint64_t offset;
  39     uint64_t size;
  40     bool has_size;
  41 } BDRVRawState;
  42
  43 static const char *const mutable_opts[] = { "offset", "size", NULL };
  44
  45 static QemuOptsList raw_runtime_opts = {
  46     .name = "raw",
  47     .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
  48     .desc = {
  49         {
  50             .name = "offset",
  51             .type = QEMU_OPT_SIZE,
  52             .help = "offset in the disk where the image starts",
  53         },
  54         {
  55             .name = "size",
  56             .type = QEMU_OPT_SIZE,
  57             .help = "virtual disk size",
  58         },
  59         { /* end of list */ }
  60     },
  61 };
  62
  63 static QemuOptsList raw_create_opts = {
  64     .name = "raw-create-opts",
  65     .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
  66     .desc = {
  67         {
  68             .name = BLOCK_OPT_SIZE,
  69             .type = QEMU_OPT_SIZE,
  70             .help = "Virtual disk size"
  71         },
  72         { /* end of list */ }
  73     }
  74 };
  75
  76 static int raw_read_options(QDict *options, uint64_t *offset, bool *has_size,
  77                             uint64_t *size, Error **errp)
  78 {
  79     QemuOpts *opts = NULL;
  80     int ret;
  81
  82     opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
  83     if (!qemu_opts_absorb_qdict(opts, options, errp)) {
  84         ret = -EINVAL;
  85         goto end;
  86     }
  87
  88     *offset = qemu_opt_get_size(opts, "offset", 0);
  89     *has_size = qemu_opt_find(opts, "size");
  90     *size = qemu_opt_get_size(opts, "size", 0);
  91
  92     ret = 0;
  93 end:
  94     qemu_opts_del(opts);
  95     return ret;
  96 }
  97
  98 static int raw_apply_options(BlockDriverState *bs, BDRVRawState *s,
  99                              uint64_t offset, bool has_size, uint64_t size,
 100                              Error **errp)
 101 {
 102     int64_t real_size = 0;
 103
 104     real_size = bdrv_getlength(bs->file->bs);
 105     if (real_size < 0) {
 106         error_setg_errno(errp, -real_size, "Could not get image size");
 107         return real_size;
 108     }
 109
 110     /* Check size and offset */
 111     if (offset > real_size) {
 112         error_setg(errp, "Offset (%" PRIu64 ") cannot be greater than "
 113                    "size of the containing file (%" PRId64 ")",
 114                    s->offset, real_size);
 115         return -EINVAL;
 116     }
 117
 118     if (has_size && (real_size - offset) < size) {
 119         error_setg(errp, "The sum of offset (%" PRIu64 ") and size "
 120                    "(%" PRIu64 ") has to be smaller or equal to the "
 121                    " actual size of the containing file (%" PRId64 ")",
 122                    s->offset, s->size, real_size);
 123         return -EINVAL;
 124     }
 125
 126     /* Make sure size is multiple of BDRV_SECTOR_SIZE to prevent rounding
 127      * up and leaking out of the specified area. */
 128     if (has_size && !QEMU_IS_ALIGNED(size, BDRV_SECTOR_SIZE)) {
 129         error_setg(errp, "Specified size is not multiple of %llu",
 130                    BDRV_SECTOR_SIZE);
 131         return -EINVAL;
 132     }
 133
 134     s->offset = offset;
 135     s->has_size = has_size;
 136     s->size = has_size ? size : real_size - offset;
 137
 138     return 0;
 139 }
 140
 141 static int raw_reopen_prepare(BDRVReopenState *reopen_state,
 142                               BlockReopenQueue *queue, Error **errp)
 143 {
 144     bool has_size;
 145     uint64_t offset, size;
 146     int ret;
 147
 148     assert(reopen_state != NULL);
 149     assert(reopen_state->bs != NULL);
 150
 151     reopen_state->opaque = g_new0(BDRVRawState, 1);
 152
 153     ret = raw_read_options(reopen_state->options, &offset, &has_size, &size,
 154                            errp);
 155     if (ret < 0) {
 156         return ret;
 157     }
 158
 159     ret = raw_apply_options(reopen_state->bs, reopen_state->opaque,
 160                             offset, has_size, size, errp);
 161     if (ret < 0) {
 162         return ret;
 163     }
 164
 165     return 0;
 166 }
 167
 168 static void raw_reopen_commit(BDRVReopenState *state)
 169 {
 170     BDRVRawState *new_s = state->opaque;
 171     BDRVRawState *s = state->bs->opaque;
 172
 173     memcpy(s, new_s, sizeof(BDRVRawState));
 174
 175     g_free(state->opaque);
 176     state->opaque = NULL;
 177 }
 178
 179 static void raw_reopen_abort(BDRVReopenState *state)
 180 {
 181     g_free(state->opaque);
 182     state->opaque = NULL;
 183 }
 184
 185 /* Check and adjust the offset, against 'offset' and 'size' options. */
 186 static inline int raw_adjust_offset(BlockDriverState *bs, int64_t *offset,
 187                                     int64_t bytes, bool is_write)
 188 {
 189     BDRVRawState *s = bs->opaque;
 190
 191     if (s->has_size && (*offset > s->size || bytes > (s->size - *offset))) {
 192         /* There's not enough space for the write, or the read request is
 193          * out-of-range. Don't read/write anything to prevent leaking out of
 194          * the size specified in options. */
 195         return is_write ? -ENOSPC : -EINVAL;
 196     }
 197
 198     if (*offset > INT64_MAX - s->offset) {
 199         return -EINVAL;
 200     }
 201     *offset += s->offset;
 202
 203     return 0;
 204 }
 205
 206 static int coroutine_fn raw_co_preadv(BlockDriverState *bs, int64_t offset,
 207                                       int64_t bytes, QEMUIOVector *qiov,
 208                                       BdrvRequestFlags flags)
 209 {
 210     int ret;
 211
 212     ret = raw_adjust_offset(bs, &offset, bytes, false);
 213     if (ret) {
 214         return ret;
 215     }
 216
 217     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
 218     return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
 219 }
 220
 221 static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset,
 222                                        int64_t bytes, QEMUIOVector *qiov,
 223                                        BdrvRequestFlags flags)
 224 {
 225     void *buf = NULL;
 226     BlockDriver *drv;
 227     QEMUIOVector local_qiov;
 228     int ret;
 229
 230     if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) {
 231         /* Handling partial writes would be a pain - so we just
 232          * require that guests have 512-byte request alignment if
 233          * probing occurred */
 234         QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512);
 235         QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512);
 236         assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE);
 237
 238         buf = qemu_try_blockalign(bs->file->bs, 512);
 239         if (!buf) {
 240             ret = -ENOMEM;
 241             goto fail;
 242         }
 243
 244         ret = qemu_iovec_to_buf(qiov, 0, buf, 512);
 245         if (ret != 512) {
 246             ret = -EINVAL;
 247             goto fail;
 248         }
 249
 250         drv = bdrv_probe_all(buf, 512, NULL);
 251         if (drv != bs->drv) {
 252             ret = -EPERM;
 253             goto fail;
 254         }
 255
 256         /* Use the checked buffer, a malicious guest might be overwriting its
 257          * original buffer in the background. */
 258         qemu_iovec_init(&local_qiov, qiov->niov + 1);
 259         qemu_iovec_add(&local_qiov, buf, 512);
 260         qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512);
 261         qiov = &local_qiov;
 262
 263         flags &= ~BDRV_REQ_REGISTERED_BUF;
 264     }
 265
 266     ret = raw_adjust_offset(bs, &offset, bytes, true);
 267     if (ret) {
 268         goto fail;
 269     }
 270
 271     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
 272     ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
 273
 274 fail:
 275     if (qiov == &local_qiov) {
 276         qemu_iovec_destroy(&local_qiov);
 277     }
 278     qemu_vfree(buf);
 279     return ret;
 280 }
 281
 282 static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
 283                                             bool want_zero, int64_t offset,
 284                                             int64_t bytes, int64_t *pnum,
 285                                             int64_t *map,
 286                                             BlockDriverState **file)
 287 {
 288     BDRVRawState *s = bs->opaque;
 289     *pnum = bytes;
 290     *file = bs->file->bs;
 291     *map = offset + s->offset;
 292     return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
 293 }
 294
 295 static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
 296                                              int64_t offset, int64_t bytes,
 297                                              BdrvRequestFlags flags)
 298 {
 299     int ret;
 300
 301     ret = raw_adjust_offset(bs, &offset, bytes, true);
 302     if (ret) {
 303         return ret;
 304     }
 305     return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
 306 }
 307
 308 static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs,
 309                                         int64_t offset, int64_t bytes)
 310 {
 311     int ret;
 312
 313     ret = raw_adjust_offset(bs, &offset, bytes, true);
 314     if (ret) {
 315         return ret;
 316     }
 317     return bdrv_co_pdiscard(bs->file, offset, bytes);
 318 }
 319
 320 static int64_t raw_getlength(BlockDriverState *bs)
 321 {
 322     int64_t len;
 323     BDRVRawState *s = bs->opaque;
 324
 325     /* Update size. It should not change unless the file was externally
 326      * modified. */
 327     len = bdrv_getlength(bs->file->bs);
 328     if (len < 0) {
 329         return len;
 330     }
 331
 332     if (len < s->offset) {
 333         s->size = 0;
 334     } else {
 335         if (s->has_size) {
 336             /* Try to honour the size */
 337             s->size = MIN(s->size, len - s->offset);
 338         } else {
 339             s->size = len - s->offset;
 340         }
 341     }
 342
 343     return s->size;
 344 }
 345
 346 static BlockMeasureInfo *raw_measure(QemuOpts *opts, BlockDriverState *in_bs,
 347                                      Error **errp)
 348 {
 349     BlockMeasureInfo *info;
 350     int64_t required;
 351
 352     if (in_bs) {
 353         required = bdrv_getlength(in_bs);
 354         if (required < 0) {
 355             error_setg_errno(errp, -required, "Unable to get image size");
 356             return NULL;
 357         }
 358     } else {
 359         required = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 360                             BDRV_SECTOR_SIZE);
 361     }
 362
 363     info = g_new0(BlockMeasureInfo, 1);
 364     info->required = required;
 365
 366     /* Unallocated sectors count towards the file size in raw images */
 367     info->fully_allocated = info->required;
 368     return info;
 369 }
 370
 371 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 372 {
 373     return bdrv_get_info(bs->file->bs, bdi);
 374 }
 375
 376 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
 377 {
 378     if (bs->probed) {
 379         /* To make it easier to protect the first sector, any probed
 380          * image is restricted to read-modify-write on sub-sector
 381          * operations. */
 382         bs->bl.request_alignment = BDRV_SECTOR_SIZE;
 383     }
 384 }
 385
 386 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
 387                                         bool exact, PreallocMode prealloc,
 388                                         BdrvRequestFlags flags, Error **errp)
 389 {
 390     BDRVRawState *s = bs->opaque;
 391
 392     if (s->has_size) {
 393         error_setg(errp, "Cannot resize fixed-size raw disks");
 394         return -ENOTSUP;
 395     }
 396
 397     if (INT64_MAX - offset < s->offset) {
 398         error_setg(errp, "Disk size too large for the chosen offset");
 399         return -EINVAL;
 400     }
 401
 402     s->size = offset;
 403     offset += s->offset;
 404     return bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp);
 405 }
 406
 407 static void raw_eject(BlockDriverState *bs, bool eject_flag)
 408 {
 409     bdrv_eject(bs->file->bs, eject_flag);
 410 }
 411
 412 static void raw_lock_medium(BlockDriverState *bs, bool locked)
 413 {
 414     bdrv_lock_medium(bs->file->bs, locked);
 415 }
 416
 417 static int coroutine_fn raw_co_ioctl(BlockDriverState *bs,
 418                                      unsigned long int req, void *buf)
 419 {
 420     BDRVRawState *s = bs->opaque;
 421     if (s->offset || s->has_size) {
 422         return -ENOTSUP;
 423     }
 424     return bdrv_co_ioctl(bs->file->bs, req, buf);
 425 }
 426
 427 static int raw_has_zero_init(BlockDriverState *bs)
 428 {
 429     return bdrv_has_zero_init(bs->file->bs);
 430 }
 431
 432 static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
 433                                            const char *filename,
 434                                            QemuOpts *opts,
 435                                            Error **errp)
 436 {
 437     return bdrv_co_create_file(filename, opts, errp);
 438 }
 439
 440 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 441                     Error **errp)
 442 {
 443     BDRVRawState *s = bs->opaque;
 444     bool has_size;
 445     uint64_t offset, size;
 446     BdrvChildRole file_role;
 447     int ret;
 448
 449     ret = raw_read_options(options, &offset, &has_size, &size, errp);
 450     if (ret < 0) {
 451         return ret;
 452     }
 453
 454     /*
 455      * Without offset and a size limit, this driver behaves very much
 456      * like a filter.  With any such limit, it does not.
 457      */
 458     if (offset || has_size) {
 459         file_role = BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY;
 460     } else {
 461         file_role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY;
 462     }
 463
 464     bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
 465                     file_role, false, errp);
 466     if (!bs->file) {
 467         return -EINVAL;
 468     }
 469
 470     bs->sg = bdrv_is_sg(bs->file->bs);
 471     bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
 472         (BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
 473     bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
 474         ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
 475             bs->file->bs->supported_zero_flags);
 476     bs->supported_truncate_flags = bs->file->bs->supported_truncate_flags &
 477                                    BDRV_REQ_ZERO_WRITE;
 478
 479     if (bs->probed && !bdrv_is_read_only(bs)) {
 480         bdrv_refresh_filename(bs->file->bs);
 481         fprintf(stderr,
 482                 "WARNING: Image format was not specified for '%s' and probing "
 483                 "guessed raw.\n"
 484                 "         Automatically detecting the format is dangerous for "
 485                 "raw images, write operations on block 0 will be restricted.\n"
 486                 "         Specify the 'raw' format explicitly to remove the "
 487                 "restrictions.\n",
 488                 bs->file->bs->filename);
 489     }
 490
 491     ret = raw_apply_options(bs, s, offset, has_size, size, errp);
 492     if (ret < 0) {
 493         return ret;
 494     }
 495
 496     if (bdrv_is_sg(bs) && (s->offset || s->has_size)) {
 497         error_setg(errp, "Cannot use offset/size with SCSI generic devices");
 498         return -EINVAL;
 499     }
 500
 501     return 0;
 502 }
 503
 504 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
 505 {
 506     /* smallest possible positive score so that raw is used if and only if no
 507      * other block driver works
 508      */
 509     return 1;
 510 }
 511
 512 static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
 513 {
 514     BDRVRawState *s = bs->opaque;
 515     int ret;
 516
 517     ret = bdrv_probe_blocksizes(bs->file->bs, bsz);
 518     if (ret < 0) {
 519         return ret;
 520     }
 521
 522     if (!QEMU_IS_ALIGNED(s->offset, MAX(bsz->log, bsz->phys))) {
 523         return -ENOTSUP;
 524     }
 525
 526     return 0;
 527 }
 528
 529 static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
 530 {
 531     BDRVRawState *s = bs->opaque;
 532     if (s->offset || s->has_size) {
 533         return -ENOTSUP;
 534     }
 535     return bdrv_probe_geometry(bs->file->bs, geo);
 536 }
 537
 538 static int coroutine_fn raw_co_copy_range_from(BlockDriverState *bs,
 539                                                BdrvChild *src,
 540                                                int64_t src_offset,
 541                                                BdrvChild *dst,
 542                                                int64_t dst_offset,
 543                                                int64_t bytes,
 544                                                BdrvRequestFlags read_flags,
 545                                                BdrvRequestFlags write_flags)
 546 {
 547     int ret;
 548
 549     ret = raw_adjust_offset(bs, &src_offset, bytes, false);
 550     if (ret) {
 551         return ret;
 552     }
 553     return bdrv_co_copy_range_from(bs->file, src_offset, dst, dst_offset,
 554                                    bytes, read_flags, write_flags);
 555 }
 556
 557 static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
 558                                              BdrvChild *src,
 559                                              int64_t src_offset,
 560                                              BdrvChild *dst,
 561                                              int64_t dst_offset,
 562                                              int64_t bytes,
 563                                              BdrvRequestFlags read_flags,
 564                                              BdrvRequestFlags write_flags)
 565 {
 566     int ret;
 567
 568     ret = raw_adjust_offset(bs, &dst_offset, bytes, true);
 569     if (ret) {
 570         return ret;
 571     }
 572     return bdrv_co_copy_range_to(src, src_offset, bs->file, dst_offset, bytes,
 573                                  read_flags, write_flags);
 574 }
 575
 576 static const char *const raw_strong_runtime_opts[] = {
 577     "offset",
 578     "size",
 579
 580     NULL
 581 };
 582
 583 static void raw_cancel_in_flight(BlockDriverState *bs)
 584 {
 585     bdrv_cancel_in_flight(bs->file->bs);
 586 }
 587
 588 static void raw_child_perm(BlockDriverState *bs, BdrvChild *c,
 589                            BdrvChildRole role,
 590                            BlockReopenQueue *reopen_queue,
 591                            uint64_t parent_perm, uint64_t parent_shared,
 592                            uint64_t *nperm, uint64_t *nshared)
 593 {
 594     bdrv_default_perms(bs, c, role, reopen_queue, parent_perm,
 595                        parent_shared, nperm, nshared);
 596
 597     /*
 598      * bdrv_default_perms() may add WRITE and/or RESIZE (see comment in
 599      * bdrv_default_perms_for_storage() for an explanation) but we only need
 600      * them if they are in parent_perm. Drop WRITE and RESIZE whenever possible
 601      * to avoid permission conflicts.
 602      */
 603     *nperm &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE);
 604     *nperm |= parent_perm & (BLK_PERM_WRITE | BLK_PERM_RESIZE);
 605 }
 606
 607 BlockDriver bdrv_raw = {
 608     .format_name          = "raw",
 609     .instance_size        = sizeof(BDRVRawState),
 610     .bdrv_probe           = &raw_probe,
 611     .bdrv_reopen_prepare  = &raw_reopen_prepare,
 612     .bdrv_reopen_commit   = &raw_reopen_commit,
 613     .bdrv_reopen_abort    = &raw_reopen_abort,
 614     .bdrv_open            = &raw_open,
 615     .bdrv_child_perm      = raw_child_perm,
 616     .bdrv_co_create_opts  = &raw_co_create_opts,
 617     .bdrv_co_preadv       = &raw_co_preadv,
 618     .bdrv_co_pwritev      = &raw_co_pwritev,
 619     .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes,
 620     .bdrv_co_pdiscard     = &raw_co_pdiscard,
 621     .bdrv_co_block_status = &raw_co_block_status,
 622     .bdrv_co_copy_range_from = &raw_co_copy_range_from,
 623     .bdrv_co_copy_range_to  = &raw_co_copy_range_to,
 624     .bdrv_co_truncate     = &raw_co_truncate,
 625     .bdrv_getlength       = &raw_getlength,
 626     .is_format            = true,
 627     .has_variable_length  = true,
 628     .bdrv_measure         = &raw_measure,
 629     .bdrv_get_info        = &raw_get_info,
 630     .bdrv_refresh_limits  = &raw_refresh_limits,
 631     .bdrv_probe_blocksizes = &raw_probe_blocksizes,
 632     .bdrv_probe_geometry  = &raw_probe_geometry,
 633     .bdrv_eject           = &raw_eject,
 634     .bdrv_lock_medium     = &raw_lock_medium,
 635     .bdrv_co_ioctl        = &raw_co_ioctl,
 636     .create_opts          = &raw_create_opts,
 637     .bdrv_has_zero_init   = &raw_has_zero_init,
 638     .strong_runtime_opts  = raw_strong_runtime_opts,
 639     .mutable_opts         = mutable_opts,
 640     .bdrv_cancel_in_flight = raw_cancel_in_flight,
 641 };
 642
 643 static void bdrv_raw_init(void)
 644 {
 645     bdrv_register(&bdrv_raw);
 646 }
 647
 648 block_init(bdrv_raw_init);