elevator: Fix a race in elevator switching

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / elevator.h

diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index acd0312d46fb13d0a2752ea49add626a1a9411d8..306dd8cd0b6f6136502cab1eefede59319f84ac2 100644 (file)
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -7,6 +7,7 @@
 #ifdef CONFIG_BLOCK
 
 struct io_cq;
+struct elevator_type;
 
 typedef int (elevator_merge_fn) (struct request_queue *, struct request **,
                                 struct bio *);
@@ -35,7 +36,8 @@ typedef void (elevator_put_req_fn) (struct request *);
 typedef void (elevator_activate_req_fn) (struct request_queue *, struct request *);
 typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct request *);
 
-typedef int (elevator_init_fn) (struct request_queue *);
+typedef int (elevator_init_fn) (struct request_queue *,
+                               struct elevator_type *e);
 typedef void (elevator_exit_fn) (struct elevator_queue *);
 
 struct elevator_ops
@@ -155,6 +157,8 @@ extern int elevator_init(struct request_queue *, char *);
 extern void elevator_exit(struct elevator_queue *);
 extern int elevator_change(struct request_queue *, const char *);
 extern bool elv_rq_merge_ok(struct request *, struct bio *);
+extern struct elevator_queue *elevator_alloc(struct request_queue *,
+                                       struct elevator_type *);
 
 /*
  * Helper functions.