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-rw-r--r--block/blk-merge.c6
-rw-r--r--block/cfq-iosched.c15
-rw-r--r--block/deadline-iosched.c2
-rw-r--r--block/elevator.c22
4 files changed, 29 insertions, 16 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index c265348b75d1..e7c2fbc3f656 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -744,6 +744,12 @@ int attempt_front_merge(struct request_queue *q, struct request *rq)
int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
struct request *next)
{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.elevator_allow_rq_merge_fn)
+ if (!e->type->ops.elevator_allow_rq_merge_fn(q, rq, next))
+ return 0;
+
return attempt_merge(q, rq, next);
}
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 892afd6d40e2..acabba198de9 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2544,7 +2544,7 @@ static int cfq_merge(struct request_queue *q, struct request **req,
struct request *__rq;
__rq = cfq_find_rq_fmerge(cfqd, bio);
- if (__rq && elv_rq_merge_ok(__rq, bio)) {
+ if (__rq && elv_bio_merge_ok(__rq, bio)) {
*req = __rq;
return ELEVATOR_FRONT_MERGE;
}
@@ -2601,8 +2601,8 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
cfq_del_cfqq_rr(cfqd, cfqq);
}
-static int cfq_allow_merge(struct request_queue *q, struct request *rq,
- struct bio *bio)
+static int cfq_allow_bio_merge(struct request_queue *q, struct request *rq,
+ struct bio *bio)
{
struct cfq_data *cfqd = q->elevator->elevator_data;
struct cfq_io_cq *cic;
@@ -2626,6 +2626,12 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
return cfqq == RQ_CFQQ(rq);
}
+static int cfq_allow_rq_merge(struct request_queue *q, struct request *rq,
+ struct request *next)
+{
+ return RQ_CFQQ(rq) == RQ_CFQQ(next);
+}
+
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
hrtimer_try_to_cancel(&cfqd->idle_slice_timer);
@@ -4821,7 +4827,8 @@ static struct elevator_type iosched_cfq = {
.elevator_merge_fn = cfq_merge,
.elevator_merged_fn = cfq_merged_request,
.elevator_merge_req_fn = cfq_merged_requests,
- .elevator_allow_merge_fn = cfq_allow_merge,
+ .elevator_allow_bio_merge_fn = cfq_allow_bio_merge,
+ .elevator_allow_rq_merge_fn = cfq_allow_rq_merge,
.elevator_bio_merged_fn = cfq_bio_merged,
.elevator_dispatch_fn = cfq_dispatch_requests,
.elevator_add_req_fn = cfq_insert_request,
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index 26a9d3c8057a..55e0bb6d7da7 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -137,7 +137,7 @@ deadline_merge(struct request_queue *q, struct request **req, struct bio *bio)
if (__rq) {
BUG_ON(sector != blk_rq_pos(__rq));
- if (elv_rq_merge_ok(__rq, bio)) {
+ if (elv_bio_merge_ok(__rq, bio)) {
ret = ELEVATOR_FRONT_MERGE;
goto out;
}
diff --git a/block/elevator.c b/block/elevator.c
index ea9319db50d7..7096c22041e7 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -53,13 +53,13 @@ static LIST_HEAD(elv_list);
* Query io scheduler to see if the current process issuing bio may be
* merged with rq.
*/
-static int elv_iosched_allow_merge(struct request *rq, struct bio *bio)
+static int elv_iosched_allow_bio_merge(struct request *rq, struct bio *bio)
{
struct request_queue *q = rq->q;
struct elevator_queue *e = q->elevator;
- if (e->type->ops.elevator_allow_merge_fn)
- return e->type->ops.elevator_allow_merge_fn(q, rq, bio);
+ if (e->type->ops.elevator_allow_bio_merge_fn)
+ return e->type->ops.elevator_allow_bio_merge_fn(q, rq, bio);
return 1;
}
@@ -67,17 +67,17 @@ static int elv_iosched_allow_merge(struct request *rq, struct bio *bio)
/*
* can we safely merge with this request?
*/
-bool elv_rq_merge_ok(struct request *rq, struct bio *bio)
+bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
{
if (!blk_rq_merge_ok(rq, bio))
- return 0;
+ return false;
- if (!elv_iosched_allow_merge(rq, bio))
- return 0;
+ if (!elv_iosched_allow_bio_merge(rq, bio))
+ return false;
- return 1;
+ return true;
}
-EXPORT_SYMBOL(elv_rq_merge_ok);
+EXPORT_SYMBOL(elv_bio_merge_ok);
static struct elevator_type *elevator_find(const char *name)
{
@@ -425,7 +425,7 @@ int elv_merge(struct request_queue *q, struct request **req, struct bio *bio)
/*
* First try one-hit cache.
*/
- if (q->last_merge && elv_rq_merge_ok(q->last_merge, bio)) {
+ if (q->last_merge && elv_bio_merge_ok(q->last_merge, bio)) {
ret = blk_try_merge(q->last_merge, bio);
if (ret != ELEVATOR_NO_MERGE) {
*req = q->last_merge;
@@ -440,7 +440,7 @@ int elv_merge(struct request_queue *q, struct request **req, struct bio *bio)
* See if our hash lookup can find a potential backmerge.
*/
__rq = elv_rqhash_find(q, bio->bi_iter.bi_sector);
- if (__rq && elv_rq_merge_ok(__rq, bio)) {
+ if (__rq && elv_bio_merge_ok(__rq, bio)) {
*req = __rq;
return ELEVATOR_BACK_MERGE;
}