elevator: make elevator_init_fn() return 0/-errno

[sfrench/cifs-2.6.git] / include / linux / elevator.h

diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c24f3d7fbf1e4543f3159155618cab9186e600d9..97fb2557a18ca27ee15c0781cfae6e8e6e51adca 100644 (file)
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -33,7 +33,7 @@ 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 void *(elevator_init_fn) (struct request_queue *);
+typedef int (elevator_init_fn) (struct request_queue *);
 typedef void (elevator_exit_fn) (struct elevator_queue *);
 
 struct elevator_ops
@@ -42,12 +42,6 @@ struct elevator_ops
        elevator_merged_fn *elevator_merged_fn;
        elevator_merge_req_fn *elevator_merge_req_fn;
        elevator_allow_merge_fn *elevator_allow_merge_fn;
-
-       /*
-        * Used for both plugged list and elevator merging and in the
-        * former case called without queue_lock.  Read comment on top of
-        * attempt_plug_merge() for details.
-        */
        elevator_bio_merged_fn *elevator_bio_merged_fn;
 
        elevator_dispatch_fn *elevator_dispatch_fn;
@@ -122,7 +116,6 @@ extern void elv_dispatch_add_tail(struct request_queue *, struct request *);
 extern void elv_add_request(struct request_queue *, struct request *, int);
 extern void __elv_add_request(struct request_queue *, struct request *, int);
 extern int elv_merge(struct request_queue *, struct request **, struct bio *);
-extern int elv_try_merge(struct request *, struct bio *);
 extern void elv_merge_requests(struct request_queue *, struct request *,
                               struct request *);
 extern void elv_merged_request(struct request_queue *, struct request *, int);
@@ -155,7 +148,7 @@ extern ssize_t elv_iosched_store(struct request_queue *, const char *, size_t);
 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 int elv_rq_merge_ok(struct request *, struct bio *);
+extern bool elv_rq_merge_ok(struct request *, struct bio *);
 
 /*
  * Helper functions.