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block/rq_qos: add rq_qos_merge() 

Add a merge hook for rq_qos.  This will be used by io.weight.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-08-28 15:05:54 -07:00 committed by Jens Axboe
parent 015d254cb0
commit d3e65ffff6
3 changed files with 22 additions and 0 deletions
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4
block/blk-core.c
View File

@ -604,6 +604,7 @@ bool bio_attempt_back_merge(struct request *req, struct bio *bio,
return false;
trace_block_bio_backmerge(req->q, req, bio);
rq_qos_merge(req->q, req, bio);
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
blk_rq_set_mixed_merge(req);
@ -625,6 +626,7 @@ bool bio_attempt_front_merge(struct request *req, struct bio *bio,
return false;
trace_block_bio_frontmerge(req->q, req, bio);
rq_qos_merge(req->q, req, bio);
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
blk_rq_set_mixed_merge(req);
@ -650,6 +652,8 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
blk_rq_get_max_sectors(req, blk_rq_pos(req)))
goto no_merge;
rq_qos_merge(q, req, bio);
req->biotail->bi_next = bio;
req->biotail = bio;
req->__data_len += bio->bi_iter.bi_size;

9
block/blk-rq-qos.c
View File

@ -83,6 +83,15 @@ void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio)
} while (rqos);
}
void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio)
{
do {
if (rqos->ops->merge)
rqos->ops->merge(rqos, rq, bio);
rqos = rqos->next;
} while (rqos);
}
void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio)
{
do {

9
block/blk-rq-qos.h
View File

@ -35,6 +35,7 @@ struct rq_qos {
struct rq_qos_ops {
void (*throttle)(struct rq_qos *, struct bio *);
void (*track)(struct rq_qos *, struct request *, struct bio *);
void (*merge)(struct rq_qos *, struct request *, struct bio *);
void (*issue)(struct rq_qos *, struct request *);
void (*requeue)(struct rq_qos *, struct request *);
void (*done)(struct rq_qos *, struct request *);
@ -135,6 +136,7 @@ void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);
void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);
void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);
void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);
void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio);
void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);
static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
@ -185,6 +187,13 @@ static inline void rq_qos_track(struct request_queue *q, struct request *rq,
__rq_qos_track(q->rq_qos, rq, bio);
}
static inline void rq_qos_merge(struct request_queue *q, struct request *rq,
struct bio *bio)
{
if (q->rq_qos)
__rq_qos_merge(q->rq_qos, rq, bio);
}
void rq_qos_exit(struct request_queue *);
#endif