Commit 5d1a5366 authored by Aaron Carroll's avatar Aaron Carroll Committed by Jens Axboe
Browse files

Deadline iosched: Factor out finding latter reques 



Factor finding the next request in sector-sorted order into
a function deadline_latter_request.

Signed-off-by: default avatarAaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 54866f03

block/deadline-iosched.c

+17 −11
Original line number Diff line number Diff line
@@ -55,6 +55,20 @@ static void deadline_move_request(struct deadline_data *, struct request *); 


#define RQ_RB_ROOT(dd, rq)	(&(dd)->sort_list[rq_data_dir((rq))])



/*

 * get the request after `rq' in sector-sorted order

 */

static inline struct request *

deadline_latter_request(struct request *rq)

{

	struct rb_node *node = rb_next(&rq->rb_node);



	if (node)

		return rb_entry_rq(node);



	return NULL;

}



static void

deadline_add_rq_rb(struct deadline_data *dd, struct request *rq)

{
@@ -74,13 +88,8 @@ deadline_del_rq_rb(struct deadline_data *dd, struct request *rq) 
{

	const int data_dir = rq_data_dir(rq);



	if (dd->next_rq[data_dir] == rq) {

		struct rb_node *rbnext = rb_next(&rq->rb_node);



		dd->next_rq[data_dir] = NULL;

		if (rbnext)

			dd->next_rq[data_dir] = rb_entry_rq(rbnext);

	}

	if (dd->next_rq[data_dir] == rq)

		dd->next_rq[data_dir] = deadline_latter_request(rq);



	elv_rb_del(RQ_RB_ROOT(dd, rq), rq);

}
@@ -198,13 +207,10 @@ static void 
deadline_move_request(struct deadline_data *dd, struct request *rq)

{

	const int data_dir = rq_data_dir(rq);

	struct rb_node *rbnext = rb_next(&rq->rb_node);



	dd->next_rq[READ] = NULL;

	dd->next_rq[WRITE] = NULL;



	if (rbnext)

		dd->next_rq[data_dir] = rb_entry_rq(rbnext);

	dd->next_rq[data_dir] = deadline_latter_request(rq);



	dd->last_sector = rq->sector + rq->nr_sectors;