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[RFC,v2,21/26] qcow2: Clear the L2 bitmap when allocating a compressed cluster

Message ID cb9f9b7784eba384b84de18262242e8c0f0aae16.1572125022.git.berto@igalia.com (mailing list archive)
State New, archived
Headers show
Series Add subcluster allocation to qcow2 | expand

Commit Message

Alberto Garcia Oct. 26, 2019, 9:25 p.m. UTC 
Compressed clusters always have the bitmap part of the extended L2
entry set to 0.

Signed-off-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2-cluster.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index acb7226e03..3ba8a98073 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -783,6 +783,7 @@  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);
+    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;