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-rw-r--r--fs/btrfs/ctree.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7e607416755a..0b180708bf79 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1171,6 +1171,7 @@ struct btrfs_space_info {
struct percpu_counter total_bytes_pinned;
struct list_head list;
+ /* Protected by the spinlock 'lock'. */
struct list_head ro_bgs;
struct rw_semaphore groups_sem;

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