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-rw-r--r--fs/btrfs/extent-tree.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 1ba2cc58eab5..c8c318494dee 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5159,6 +5159,14 @@ have_block_group:
if (unlikely(block_group->ro))
goto loop;
+ spin_lock(&block_group->tree_lock);
+ if (cached &&
+ block_group->free_space < num_bytes + empty_size) {
+ spin_unlock(&block_group->tree_lock);
+ goto loop;
+ }
+ spin_unlock(&block_group->tree_lock);
+
/*
* Ok we want to try and use the cluster allocator, so lets look
* there, unless we are on LOOP_NO_EMPTY_SIZE, since we will
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