[RFC PATCH v3 22/27] qcow2: Clear the L2 bitmap when allocating a compressed cluster

[Alberto Garcia]

Compressed clusters always have the bitmap part of the extended L2
entry set to 0.

Signed-off-by: Alberto Garcia <be...@igalia.com>
---
 block/qcow2-cluster.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index ed291a4042..af0f01621c 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -789,6 +789,9 @@ int qcow2_alloc_compressed_cluster_offset(BlockDriverState 
*bs,
     BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED);
     qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice);
     set_l2_entry(s, l2_slice, l2_index, cluster_offset);
+    if (has_subclusters(s)) {
+        set_l2_bitmap(s, l2_slice, l2_index, 0);
+    }
     qcow2_cache_put(s->l2_table_cache, (void **) &l2_slice);
 
     *host_offset = cluster_offset & s->cluster_offset_mask;
-- 
2.20.1