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Diffstat (limited to 'block/qcow2.c')
-rw-r--r--block/qcow2.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index dd32ea2078..ced257e9f5 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,