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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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17
include/linux/blkdev.h
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@@ -229,6 +229,8 @@ struct request {
struct bio *bio;
struct bio *biotail;
struct hlist_node hash; /* merge hash */
void *elevator_private;
void *completion_data;
@@ -696,21 +698,6 @@ static inline void blkdev_dequeue_request(struct request *req)
elv_dequeue_request(req->q, 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
*/