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blk-ioprio: Convert from rqos policy to direct call

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Convert blk-ioprio handling from a rqos policy to a direct call from
blk_mq_submit_bio(). Firstly, blk-ioprio is not much of a rqos policy
anyway, it just needs a hook in bio submission path to set the bio's IO
priority. Secondly, the rqos .track hook gets actually called too late
for blk-ioprio purposes and introducing a special rqos hook just for
blk-ioprio looks even weirder.

Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220623074840.5960-7-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2022-06-23 09:48:32 +02:00 committed by Jens Axboe
parent f258654472
commit 82b74cac28
4 changed files with 23 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/blk-cgroup.c
View File

@ -1299,6 +1299,7 @@ int blkcg_init_queue(struct request_queue *q)
ret = blk_iolatency_init(q);
if (ret) {
blk_throtl_exit(q);
blk_ioprio_exit(q);
goto err_destroy_all;
}

50
block/blk-ioprio.c
View File

@ -181,17 +181,12 @@ static struct blkcg_policy ioprio_policy = {
.pd_free_fn = ioprio_free_pd,
};
struct blk_ioprio {
struct rq_qos rqos;
};
static void blkcg_ioprio_track(struct rq_qos *rqos, struct request *rq,
struct bio *bio)
void blkcg_set_ioprio(struct bio *bio)
{
struct ioprio_blkcg *blkcg = ioprio_blkcg_from_bio(bio);
u16 prio;
if (blkcg->prio_policy == POLICY_NO_CHANGE)
if (!blkcg || blkcg->prio_policy == POLICY_NO_CHANGE)
return;
/*
@ -207,49 +202,14 @@ static void blkcg_ioprio_track(struct rq_qos *rqos, struct request *rq,
bio->bi_ioprio = prio;
}
static void blkcg_ioprio_exit(struct rq_qos *rqos)
void blk_ioprio_exit(struct request_queue *q)
{
struct blk_ioprio *blkioprio_blkg =
container_of(rqos, typeof(*blkioprio_blkg), rqos);
blkcg_deactivate_policy(rqos->q, &ioprio_policy);
kfree(blkioprio_blkg);
blkcg_deactivate_policy(q, &ioprio_policy);
}
static struct rq_qos_ops blkcg_ioprio_ops = {
.track = blkcg_ioprio_track,
.exit = blkcg_ioprio_exit,
};
int blk_ioprio_init(struct request_queue *q)
{
struct blk_ioprio *blkioprio_blkg;
struct rq_qos *rqos;
int ret;
blkioprio_blkg = kzalloc(sizeof(*blkioprio_blkg), GFP_KERNEL);
if (!blkioprio_blkg)
return -ENOMEM;
ret = blkcg_activate_policy(q, &ioprio_policy);
if (ret) {
kfree(blkioprio_blkg);
return ret;
}
rqos = &blkioprio_blkg->rqos;
rqos->id = RQ_QOS_IOPRIO;
rqos->ops = &blkcg_ioprio_ops;
rqos->q = q;
/*
* Registering the rq-qos policy after activating the blk-cgroup
* policy guarantees that ioprio_blkcg_from_bio(bio) != NULL in the
* rq-qos callbacks.
*/
rq_qos_add(q, rqos);
return 0;
return blkcg_activate_policy(q, &ioprio_policy);
}
static int __init ioprio_init(void)

9
block/blk-ioprio.h
View File

@ -6,14 +6,23 @@
#include <linux/kconfig.h>
struct request_queue;
struct bio;
#ifdef CONFIG_BLK_CGROUP_IOPRIO
int blk_ioprio_init(struct request_queue *q);
void blk_ioprio_exit(struct request_queue *q);
void blkcg_set_ioprio(struct bio *bio);
#else
static inline int blk_ioprio_init(struct request_queue *q)
{
return 0;
}
static inline void blk_ioprio_exit(struct request_queue *q)
{
}
static inline void blkcg_set_ioprio(struct bio *bio)
{
}
#endif
#endif /* _BLK_IOPRIO_H_ */

8
block/blk-mq.c
View File

@ -42,6 +42,7 @@
#include "blk-stat.h"
#include "blk-mq-sched.h"
#include "blk-rq-qos.h"
#include "blk-ioprio.h"
static DEFINE_PER_CPU(struct llist_head, blk_cpu_done);
@ -2779,6 +2780,11 @@ static inline struct request *blk_mq_get_cached_request(struct request_queue *q,
return rq;
}
static void bio_set_ioprio(struct bio *bio)
{
blkcg_set_ioprio(bio);
}
/**
* blk_mq_submit_bio - Create and send a request to block device.
* @bio: Bio pointer.
@ -2819,6 +2825,8 @@ void blk_mq_submit_bio(struct bio *bio)
trace_block_getrq(bio);
bio_set_ioprio(bio);
rq_qos_track(q, rq, bio);
blk_mq_bio_to_request(rq, bio, nr_segs);