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[PATCH] elevator: move the backmerging logic into the elevator core

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Right now, every IO scheduler implements its own backmerging (except for
noop, which does no merging). That results in duplicated code for
essentially the same operation, which is never a good thing. This patch
moves the backmerging out of the io schedulers and into the elevator
core. We save 1.6kb of text and as a bonus get backmerging for noop as
well. Win-win!

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe
2006-07-28 09:23:08 +02:00
committed by Jens Axboe
parent 4aff5e2333
commit 9817064b68
7 changed files with 146 additions and 375 deletions
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include/linux/elevator.h
+2
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@@ -82,12 +82,14 @@ struct elevator_queue
struct kobject kobj;
struct elevator_type *elevator_type;
struct mutex sysfs_lock;
struct hlist_head *hash;
};
/*
* block elevator interface
*/
extern void elv_dispatch_sort(request_queue_t *, struct request *);
extern void elv_dispatch_add_tail(request_queue_t *, struct request *);
extern void elv_add_request(request_queue_t *, struct request *, int, int);
extern void __elv_add_request(request_queue_t *, struct request *, int, int);
extern void elv_insert(request_queue_t *, struct request *, int);