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authorJens Axboe <axboe@suse.de>2006-07-28 09:23:08 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-09-30 20:26:56 +0200
commit9817064b68fef7e4580c6df1ea597e106b9ff88b (patch)
tree76c27990626247613e9efa45b792d51ad79635d7 /include/linux/elevator.h
parent4aff5e2333c9a1609662f2091f55c3f6fffdad36 (diff)
downloadop-kernel-dev-9817064b68fef7e4580c6df1ea597e106b9ff88b.zip
op-kernel-dev-9817064b68fef7e4580c6df1ea597e106b9ff88b.tar.gz
[PATCH] elevator: move the backmerging logic into the elevator core
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>
Diffstat (limited to 'include/linux/elevator.h')
-rw-r--r--include/linux/elevator.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 1713ace..2c270e9 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -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);
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