[PATCH 3/6] btrfs: free fully occupied bitmap in cluster

[Li Zefan]

If there's no more free space in a bitmap, we should free it,
otherwise seems it won't get freed until we free the block group.

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 fs/btrfs/free-space-cache.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 017fd55..631e14f 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1035,6 +1035,8 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group,
 
 	ret = search_start;
 	bitmap_clear_bits(block_group, entry, ret, bytes);
+	if (entry->bytes == 0)
+		free_bitmap(block_group, entry);
 out:
 	spin_unlock(&cluster->lock);
 	spin_unlock(&block_group->tree_lock);
-- 
1.7.0.1

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