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qcow2: Clear the L2 bitmap when allocating a compressed cluster

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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>
Message-Id: <04455b3de5dfeb9d1cfe1fc7b02d7060a6e09710.1594396418.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-07-10 18:13:08 +02:00 committed by Max Reitz
parent aca00cd971
commit ff4cdec7f6
1 changed files with 3 additions and 0 deletions
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3
block/qcow2-cluster.c
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@ -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;