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authorJens Axboe <axboe@suse.de>2006-07-13 11:55:04 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-09-30 20:26:57 +0200
commit2e662b65f05d550b6799ed6bfa9963b82279e6b7 (patch)
tree82911ec73a52d149d74a3d13c3c5eedb269a19cb /include
parent10fd48f2376db52f08bf0420d2c4f580e39269e1 (diff)
[PATCH] elevator: abstract out the rbtree sort handling
The rbtree sort/lookup/reposition logic is mostly duplicated in cfq/deadline/as, so move it to the elevator core. The io schedulers still provide the actual rb root, as we don't want to impose any sort of specific handling on the schedulers. Introduce the helpers and rb_node in struct request to help migrate the IO schedulers. Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev.h1
-rw-r--r--include/linux/elevator.h18
2 files changed, 17 insertions, 2 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8f548696467..a905c4934a5 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -230,6 +230,7 @@ struct request {
struct bio *biotail;
struct hlist_node hash; /* merge hash */
+ struct rb_node rb_node; /* sort/lookup */
void *elevator_private;
void *completion_data;
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 2c270e90b33..95b2a04b969 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -6,7 +6,7 @@ typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
-typedef void (elevator_merged_fn) (request_queue_t *, struct request *);
+typedef void (elevator_merged_fn) (request_queue_t *, struct request *, int);
typedef int (elevator_dispatch_fn) (request_queue_t *, int);
@@ -96,7 +96,7 @@ extern void elv_insert(request_queue_t *, struct request *, int);
extern int elv_merge(request_queue_t *, struct request **, struct bio *);
extern void elv_merge_requests(request_queue_t *, struct request *,
struct request *);
-extern void elv_merged_request(request_queue_t *, struct request *);
+extern void elv_merged_request(request_queue_t *, struct request *, int);
extern void elv_dequeue_request(request_queue_t *, struct request *);
extern void elv_requeue_request(request_queue_t *, struct request *);
extern int elv_queue_empty(request_queue_t *);
@@ -127,6 +127,19 @@ extern void elevator_exit(elevator_t *);
extern int elv_rq_merge_ok(struct request *, struct bio *);
/*
+ * Helper functions.
+ */
+extern struct request *elv_rb_former_request(request_queue_t *, struct request *);
+extern struct request *elv_rb_latter_request(request_queue_t *, struct request *);
+
+/*
+ * rb support functions.
+ */
+extern struct request *elv_rb_add(struct rb_root *, struct request *);
+extern void elv_rb_del(struct rb_root *, struct request *);
+extern struct request *elv_rb_find(struct rb_root *, sector_t);
+
+/*
* Return values from elevator merger
*/
#define ELEVATOR_NO_MERGE 0
@@ -151,5 +164,6 @@ enum {
};
#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
+#define rb_entry_rq(node) rb_entry((node), struct request, rb_node)
#endif