aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/block/noop-iosched.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/noop-iosched.c')
-rw-r--r--drivers/block/noop-iosched.c48
1 files changed, 5 insertions, 43 deletions
diff --git a/drivers/block/noop-iosched.c b/drivers/block/noop-iosched.c
index b1730b62c37e..f56b8edb06e4 100644
--- a/drivers/block/noop-iosched.c
+++ b/drivers/block/noop-iosched.c
@@ -7,57 +7,19 @@
7#include <linux/module.h> 7#include <linux/module.h>
8#include <linux/init.h> 8#include <linux/init.h>
9 9
10/* 10static void elevator_noop_add_request(request_queue_t *q, struct request *rq)
11 * See if we can find a request that this buffer can be coalesced with.
12 */
13static int elevator_noop_merge(request_queue_t *q, struct request **req,
14 struct bio *bio)
15{
16 int ret;
17
18 ret = elv_try_last_merge(q, bio);
19 if (ret != ELEVATOR_NO_MERGE)
20 *req = q->last_merge;
21
22 return ret;
23}
24
25static void elevator_noop_merge_requests(request_queue_t *q, struct request *req,
26 struct request *next)
27{
28 list_del_init(&next->queuelist);
29}
30
31static void elevator_noop_add_request(request_queue_t *q, struct request *rq,
32 int where)
33{ 11{
34 if (where == ELEVATOR_INSERT_FRONT) 12 elv_dispatch_add_tail(q, rq);
35 list_add(&rq->queuelist, &q->queue_head);
36 else
37 list_add_tail(&rq->queuelist, &q->queue_head);
38
39 /*
40 * new merges must not precede this barrier
41 */
42 if (rq->flags & REQ_HARDBARRIER)
43 q->last_merge = NULL;
44 else if (!q->last_merge)
45 q->last_merge = rq;
46} 13}
47 14
48static struct request *elevator_noop_next_request(request_queue_t *q) 15static int elevator_noop_dispatch(request_queue_t *q, int force)
49{ 16{
50 if (!list_empty(&q->queue_head)) 17 return 0;
51 return list_entry_rq(q->queue_head.next);
52
53 return NULL;
54} 18}
55 19
56static struct elevator_type elevator_noop = { 20static struct elevator_type elevator_noop = {
57 .ops = { 21 .ops = {
58 .elevator_merge_fn = elevator_noop_merge, 22 .elevator_dispatch_fn = elevator_noop_dispatch,
59 .elevator_merge_req_fn = elevator_noop_merge_requests,
60 .elevator_next_req_fn = elevator_noop_next_request,
61 .elevator_add_req_fn = elevator_noop_add_request, 23 .elevator_add_req_fn = elevator_noop_add_request,
62 }, 24 },
63 .elevator_name = "noop", 25 .elevator_name = "noop",