[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 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -541,33 +541,19 @@ int elv_queue_empty(request_queue_t *q)
 
 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;
 }