diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index dd32ea2..ced257e 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -855,6 +855,51 @@ static int qcow_make_empty(BlockDriverState *bs) return 0; } +static int qcow2_write(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors) +{ + BDRVQcowState *s = bs->opaque; + int ret, index_in_cluster, n; + uint64_t cluster_offset; + int n_end; + QCowL2Meta l2meta; + + while (nb_sectors > 0) { + memset(&l2meta, 0, sizeof(l2meta)); + + index_in_cluster = sector_num & (s->cluster_sectors - 1); + n_end = index_in_cluster + nb_sectors; + if (s->crypt_method && + n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) + n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; + cluster_offset = qcow2_alloc_cluster_offset(bs, sector_num << 9, + index_in_cluster, + n_end, &n, &l2meta); + if (!cluster_offset) + return -1; + if (s->crypt_method) { + qcow2_encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1, + &s->aes_encrypt_key); + ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, + s->cluster_data, n * 512); + } else { + ret = bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512); + } + if (ret != n * 512 || qcow2_alloc_cluster_link_l2(bs, cluster_offset, &l2meta) < 0) { + qcow2_free_any_clusters(bs, cluster_offset, l2meta.nb_clusters); + return -1; + } + nb_sectors -= n; + sector_num += n; + buf += n * 512; + if (l2meta.nb_clusters != 0) { + LIST_REMOVE(&l2meta, next_in_flight); + } + } + s->cluster_cache_offset = -1; /* disable compressed cache */ + return 0; +} + /* XXX: put compressed sectors first, then all the cluster aligned tables to avoid losing bytes in alignment */ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, @@ -1037,8 +1082,10 @@ static BlockDriver bdrv_qcow2 = { .bdrv_set_key = qcow_set_key, .bdrv_make_empty = qcow_make_empty, - .bdrv_aio_readv = qcow_aio_readv, - .bdrv_aio_writev = qcow_aio_writev, + .bdrv_read = qcow2_read, + .bdrv_write = qcow2_write, + .bdrv_aio_readv = qcow_aio_readv, + .bdrv_aio_writev = qcow_aio_writev, .bdrv_write_compressed = qcow_write_compressed, .bdrv_snapshot_create = qcow2_snapshot_create, |