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[v10,26/34] qcow2: Clear the L2 bitmap when allocating a compressed cluster

Message ID e258fb4d46f6a6941156eca9fb4de765ce59f2a5.1593791819.git.berto@igalia.com
State Superseded
Headers show
Series Add subcluster allocation to qcow2 | expand

Commit Message

Alberto Garcia July 3, 2020, 3:58 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>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-cluster.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 5bdbb65e7b..6b5d0698d0 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -862,6 +862,9 @@  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;