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-rw-r--r--block/qcow2.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 3e1482fa7e..9a8b354d0e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -536,6 +536,14 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
}
break;
+ case QCOW2_CLUSTER_ZERO:
+ if (s->qcow_version < 3) {
+ ret = -EIO;
+ goto fail;
+ }
+ qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
+ break;
+
case QCOW2_CLUSTER_COMPRESSED:
/* add AIO support for compressed blocks ? */
ret = qcow2_decompress_cluster(bs, cluster_offset);