1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index a24931d24404..e88fcbc77f8f 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -12,6 +12,8 @@ typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struc
 
 typedef void (elevator_merged_fn) (request_queue_t *, struct request *, int);
 
+typedef int (elevator_allow_merge_fn) (request_queue_t *, struct request *, struct bio *);
+
 typedef int (elevator_dispatch_fn) (request_queue_t *, int);
 
 typedef void (elevator_add_req_fn) (request_queue_t *, struct request *);
@@ -33,6 +35,7 @@ struct elevator_ops
         elevator_merge_fn *elevator_merge_fn;
         elevator_merged_fn *elevator_merged_fn;
         elevator_merge_req_fn *elevator_merge_req_fn;
+        elevator_allow_merge_fn *elevator_allow_merge_fn;
 
         elevator_dispatch_fn *elevator_dispatch_fn;
         elevator_add_req_fn *elevator_add_req_fn;