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rq-qos: introduce dio_bio callback

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wbt cares only about request completion time, but controllers may need
information that is on the bio itself, so add a done_bio callback for
rq-qos so things like blk-iolatency can use it to have the bio when it
completes.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2018-07-03 11:15:00 -04:00 committed by Jens Axboe
parent c1c80384c8
commit 67b42d0bf7
3 changed files with 16 additions and 0 deletions
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4
block/bio.c
View File

@ -32,6 +32,7 @@
#include <trace/events/block.h>
#include "blk.h"
#include "blk-rq-qos.h"
/*
* Test patch to inline a certain number of bi_io_vec's inside the bio
@ -1808,6 +1809,9 @@ again:
if (!bio_integrity_endio(bio))
return;
if (bio->bi_disk)
rq_qos_done_bio(bio->bi_disk->queue, bio);
/*
* Need to have a real endio function for chained bios, otherwise
* various corner cases will break (like stacking block devices that

10
block/blk-rq-qos.c
View File

@ -88,6 +88,16 @@ void rq_qos_track(struct request_queue *q, struct request *rq, struct bio *bio)
}
}
void rq_qos_done_bio(struct request_queue *q, struct bio *bio)
{
struct rq_qos *rqos;
for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
if (rqos->ops->done_bio)
rqos->ops->done_bio(rqos, bio);
}
}
/*
* Return true, if we can't increase the depth further by scaling
*/

2
block/blk-rq-qos.h
View File

@ -30,6 +30,7 @@ struct rq_qos_ops {
void (*issue)(struct rq_qos *, struct request *);
void (*requeue)(struct rq_qos *, struct request *);
void (*done)(struct rq_qos *, struct request *);
void (*done_bio)(struct rq_qos *, struct bio *);
void (*cleanup)(struct rq_qos *, struct bio *);
void (*exit)(struct rq_qos *);
};
@ -101,6 +102,7 @@ void rq_qos_cleanup(struct request_queue *, struct bio *);
void rq_qos_done(struct request_queue *, struct request *);
void rq_qos_issue(struct request_queue *, struct request *);
void rq_qos_requeue(struct request_queue *, struct request *);
void rq_qos_done_bio(struct request_queue *q, struct bio *bio);
void rq_qos_throttle(struct request_queue *, struct bio *, spinlock_t *);
void rq_qos_track(struct request_queue *q, struct request *, struct bio *);
void rq_qos_exit(struct request_queue *);