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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/blkdev.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/blkdev.h')
-rw-r--r--include/linux/blkdev.h17
1 files changed, 2 insertions, 15 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b2a412c..8f54869 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -229,6 +229,8 @@ struct request {
struct bio *bio;
struct bio *biotail;
+ struct hlist_node hash; /* merge hash */
+
void *elevator_private;
void *completion_data;
@@ -697,21 +699,6 @@ static inline void blkdev_dequeue_request(struct request *req)
}
/*
- * This should be in elevator.h, but that requires pulling in rq and q
- */
-static inline void elv_dispatch_add_tail(struct request_queue *q,
- struct request *rq)
-{
- if (q->last_merge == rq)
- q->last_merge = NULL;
- q->nr_sorted--;
-
- q->end_sector = rq_end_sector(rq);
- q->boundary_rq = rq;
- list_add_tail(&rq->queuelist, &q->queue_head);
-}
-
-/*
* Access functions for manipulating queue properties
*/
extern request_queue_t *blk_init_queue_node(request_fn_proc *rfn,
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