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Subject[PATCH 11/13] rq-qos: introduce dio_bio callback
Date
From: Josef Bacik <jbacik@fb.com>

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>
---
block/bio.c | 4 ++++
block/blk-rq-qos.c | 10 ++++++++++
block/blk-rq-qos.h | 2 ++
3 files changed, 16 insertions(+)

diff --git a/block/bio.c b/block/bio.c
index c77fe1b4caa8..99809b73a400 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -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
@@ -1781,6 +1782,9 @@ void bio_endio(struct bio *bio)
if (WARN_ONCE(bio->bi_next, "driver left bi_next not NULL"))
bio->bi_next = NULL;

+ 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
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index b7b02e04f64f..5134b24482f6 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -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
*/
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 501253676dd8..3874e6ad09f0 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -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 *);
};
@@ -86,6 +87,7 @@ 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 *);
--
2.14.3
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