[BLOCK] elevator: elv_latter/former_request update
With generic dispatch queue update, implicit former/latter request
handling using rq->queuelist.prev/next doesn't work as expected
anymore. Also, the only iosched dependent on this feature was
noop-iosched and it has been reimplemented to have its own
latter/former methods. This patch removes implicit former/latter
handling.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/block/elevator.c b/block/elevator.c
index cacfff7..e4c5882 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -541,33 +541,19 @@
struct request *elv_latter_request(request_queue_t *q, struct request *rq)
{
- struct list_head *next;
-
elevator_t *e = q->elevator;
if (e->ops->elevator_latter_req_fn)
return e->ops->elevator_latter_req_fn(q, rq);
-
- next = rq->queuelist.next;
- if (next != &q->queue_head && next != &rq->queuelist)
- return list_entry_rq(next);
-
return NULL;
}
struct request *elv_former_request(request_queue_t *q, struct request *rq)
{
- struct list_head *prev;
-
elevator_t *e = q->elevator;
if (e->ops->elevator_former_req_fn)
return e->ops->elevator_former_req_fn(q, rq);
-
- prev = rq->queuelist.prev;
- if (prev != &q->queue_head && prev != &rq->queuelist)
- return list_entry_rq(prev);
-
return NULL;
}