diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/parallels.c | 191 |
1 files changed, 98 insertions, 93 deletions
diff --git a/block/parallels.c b/block/parallels.c index f8a99810ed..35ffb6f398 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -73,99 +73,6 @@ typedef struct BDRVParallelsState { bool has_truncate; } BDRVParallelsState; -static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename) -{ - const ParallelsHeader *ph = (const void *)buf; - - if (buf_size < sizeof(ParallelsHeader)) - return 0; - - if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || - !memcmp(ph->magic, HEADER_MAGIC2, 16)) && - (le32_to_cpu(ph->version) == HEADER_VERSION)) - return 100; - - return 0; -} - -static int parallels_open(BlockDriverState *bs, QDict *options, int flags, - Error **errp) -{ - BDRVParallelsState *s = bs->opaque; - ParallelsHeader ph; - int ret, size; - - ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); - if (ret < 0) { - goto fail; - } - - bs->total_sectors = le64_to_cpu(ph.nb_sectors); - - if (le32_to_cpu(ph.version) != HEADER_VERSION) { - goto fail_format; - } - if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { - s->off_multiplier = 1; - bs->total_sectors = 0xffffffff & bs->total_sectors; - } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { - s->off_multiplier = le32_to_cpu(ph.tracks); - } else { - goto fail_format; - } - - s->tracks = le32_to_cpu(ph.tracks); - if (s->tracks == 0) { - error_setg(errp, "Invalid image: Zero sectors per track"); - ret = -EINVAL; - goto fail; - } - if (s->tracks > INT32_MAX/513) { - error_setg(errp, "Invalid image: Too big cluster"); - ret = -EFBIG; - goto fail; - } - - s->bat_size = le32_to_cpu(ph.bat_entries); - if (s->bat_size > INT_MAX / sizeof(uint32_t)) { - error_setg(errp, "Catalog too large"); - ret = -EFBIG; - goto fail; - } - - size = sizeof(ParallelsHeader) + sizeof(uint32_t) * s->bat_size; - s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file)); - s->header = qemu_try_blockalign(bs->file, s->header_size); - if (s->header == NULL) { - ret = -ENOMEM; - goto fail; - } - if (le32_to_cpu(ph.data_off) < s->header_size) { - /* there is not enough unused space to fit to block align between BAT - and actual data. We can't avoid read-modify-write... */ - s->header_size = size; - } - - ret = bdrv_pread(bs->file, 0, s->header, s->header_size); - if (ret < 0) { - goto fail; - } - s->bat_bitmap = (uint32_t *)(s->header + 1); - - s->has_truncate = bdrv_has_zero_init(bs->file) && - bdrv_truncate(bs->file, bdrv_getlength(bs->file)) == 0; - - qemu_co_mutex_init(&s->lock); - return 0; - -fail_format: - error_setg(errp, "Image not in Parallels format"); - ret = -EINVAL; -fail: - qemu_vfree(s->header); - return ret; -} - static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) { @@ -407,6 +314,104 @@ exit: goto done; } + +static int parallels_probe(const uint8_t *buf, int buf_size, + const char *filename) +{ + const ParallelsHeader *ph = (const void *)buf; + + if (buf_size < sizeof(ParallelsHeader)) { + return 0; + } + + if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || + !memcmp(ph->magic, HEADER_MAGIC2, 16)) && + (le32_to_cpu(ph->version) == HEADER_VERSION)) { + return 100; + } + + return 0; +} + +static int parallels_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + BDRVParallelsState *s = bs->opaque; + ParallelsHeader ph; + int ret, size; + + ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); + if (ret < 0) { + goto fail; + } + + bs->total_sectors = le64_to_cpu(ph.nb_sectors); + + if (le32_to_cpu(ph.version) != HEADER_VERSION) { + goto fail_format; + } + if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { + s->off_multiplier = 1; + bs->total_sectors = 0xffffffff & bs->total_sectors; + } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { + s->off_multiplier = le32_to_cpu(ph.tracks); + } else { + goto fail_format; + } + + s->tracks = le32_to_cpu(ph.tracks); + if (s->tracks == 0) { + error_setg(errp, "Invalid image: Zero sectors per track"); + ret = -EINVAL; + goto fail; + } + if (s->tracks > INT32_MAX/513) { + error_setg(errp, "Invalid image: Too big cluster"); + ret = -EFBIG; + goto fail; + } + + s->bat_size = le32_to_cpu(ph.bat_entries); + if (s->bat_size > INT_MAX / sizeof(uint32_t)) { + error_setg(errp, "Catalog too large"); + ret = -EFBIG; + goto fail; + } + + size = sizeof(ParallelsHeader) + sizeof(uint32_t) * s->bat_size; + s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file)); + s->header = qemu_try_blockalign(bs->file, s->header_size); + if (s->header == NULL) { + ret = -ENOMEM; + goto fail; + } + if (le32_to_cpu(ph.data_off) < s->header_size) { + /* there is not enough unused space to fit to block align between BAT + and actual data. We can't avoid read-modify-write... */ + s->header_size = size; + } + + ret = bdrv_pread(bs->file, 0, s->header, s->header_size); + if (ret < 0) { + goto fail; + } + s->bat_bitmap = (uint32_t *)(s->header + 1); + + s->has_truncate = bdrv_has_zero_init(bs->file) && + bdrv_truncate(bs->file, bdrv_getlength(bs->file)) == 0; + + qemu_co_mutex_init(&s->lock); + return 0; + +fail_format: + error_setg(errp, "Image not in Parallels format"); + ret = -EINVAL; +fail: + qemu_vfree(s->header); + return ret; +} + + static void parallels_close(BlockDriverState *bs) { BDRVParallelsState *s = bs->opaque; |