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Deadline iosched: Factor out finding latter reques

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

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Aaron Carroll 2007-10-30 10:40:12 +01:00 committed by Jens Axboe
parent 54866f0323
commit 5d1a536621
1 changed files with 17 additions and 11 deletions
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28
block/deadline-iosched.c
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@ -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;