1 files changed, 4 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index baeec83d01f9..63c7a1a6c022 100644
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -233,6 +233,10 @@ typedef struct xfs_perag {
         struct mutex    pag_ici_reclaim_lock;   /* serialisation point */
         unsigned long   pag_ici_reclaim_cursor; /* reclaim restart point */
 
+        /* buffer cache index */
+        spinlock_t      pag_buf_lock;   /* lock for pag_buf_tree */
+        struct rb_root  pag_buf_tree;   /* ordered tree of active buffers */
+
         /* for rcu-safe freeing */
         struct rcu_head rcu_head;
 #endif