Commit db18a53e authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-cgroup: remove blkcg_bio_issue_check 



blkcg_bio_issue_check is a giant inline function that does three entirely
different things.  Factor out the blk-cgroup related bio initalization
into a new helper, and the open code the sequence in the only caller,
relying on the fact that all the actual functionality is stubbed out for
non-cgroup builds.

Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 93b80638

block/blk-cgroup.c

+34 −0
Original line number Diff line number Diff line
@@ -1813,6 +1813,40 @@ void bio_clone_blkg_association(struct bio *dst, struct bio *src) 
}

EXPORT_SYMBOL_GPL(bio_clone_blkg_association);



static int blk_cgroup_io_type(struct bio *bio)

{

	if (op_is_discard(bio->bi_opf))

		return BLKG_IOSTAT_DISCARD;

	if (op_is_write(bio->bi_opf))

		return BLKG_IOSTAT_WRITE;

	return BLKG_IOSTAT_READ;

}



void blk_cgroup_bio_start(struct bio *bio)

{

	int rwd = blk_cgroup_io_type(bio), cpu;

	struct blkg_iostat_set *bis;



	cpu = get_cpu();

	bis = per_cpu_ptr(bio->bi_blkg->iostat_cpu, cpu);

	u64_stats_update_begin(&bis->sync);



	/*

	 * If the bio is flagged with BIO_CGROUP_ACCT it means this is a split

	 * bio and we would have already accounted for the size of the bio.

	 */

	if (!bio_flagged(bio, BIO_CGROUP_ACCT)) {

		bio_set_flag(bio, BIO_CGROUP_ACCT);

			bis->cur.bytes[rwd] += bio->bi_iter.bi_size;

	}

	bis->cur.ios[rwd]++;



	u64_stats_update_end(&bis->sync);

	if (cgroup_subsys_on_dfl(io_cgrp_subsys))

		cgroup_rstat_updated(bio->bi_blkg->blkcg->css.cgroup, cpu);

	put_cpu();

}



static int __init blkcg_init(void)

{

	blkcg_punt_bio_wq = alloc_workqueue("blkcg_punt_bio",

block/blk-core.c

+6 −1
Original line number Diff line number Diff line
@@ -1073,8 +1073,13 @@ generic_make_request_checks(struct bio *bio) 
	if (unlikely(!current->io_context))

		create_task_io_context(current, GFP_ATOMIC, q->node);



	if (!blkcg_bio_issue_check(q, bio))

	if (blk_throtl_bio(bio)) {

		blkcg_bio_issue_init(bio);

		return false;

	}



	blk_cgroup_bio_start(bio);

	blkcg_bio_issue_init(bio);



	if (!bio_flagged(bio, BIO_TRACE_COMPLETION)) {

		trace_block_bio_queue(q, bio);

block/blk-throttle.c

+3 −2
Original line number Diff line number Diff line
@@ -2158,9 +2158,10 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td) 
}

#endif



bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,

		    struct bio *bio)

bool blk_throtl_bio(struct bio *bio)

{

	struct request_queue *q = bio->bi_disk->queue;

	struct blkcg_gq *blkg = bio->bi_blkg;

	struct throtl_qnode *qn = NULL;

	struct throtl_grp *tg = blkg_to_tg(blkg ?: q->root_blkg);

	struct throtl_service_queue *sq;

block/blk.h

+2 −0
Original line number Diff line number Diff line
@@ -288,10 +288,12 @@ int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); 
extern int blk_throtl_init(struct request_queue *q);

extern void blk_throtl_exit(struct request_queue *q);

extern void blk_throtl_register_queue(struct request_queue *q);

bool blk_throtl_bio(struct bio *bio);

#else /* CONFIG_BLK_DEV_THROTTLING */

static inline int blk_throtl_init(struct request_queue *q) { return 0; }

static inline void blk_throtl_exit(struct request_queue *q) { }

static inline void blk_throtl_register_queue(struct request_queue *q) { }

static inline bool blk_throtl_bio(struct bio *bio) { return false; }

#endif /* CONFIG_BLK_DEV_THROTTLING */

#ifdef CONFIG_BLK_DEV_THROTTLING_LOW

extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);

include/linux/blk-cgroup.h

+2 −54
Original line number Diff line number Diff line
@@ -517,14 +517,6 @@ static inline void blkg_put(struct blkcg_gq *blkg) 
		if (((d_blkg) = __blkg_lookup(css_to_blkcg(pos_css),	\

					      (p_blkg)->q, false)))



#ifdef CONFIG_BLK_DEV_THROTTLING

extern bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,

			   struct bio *bio);

#else

static inline bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,

				  struct bio *bio) { return false; }

#endif



bool __blkcg_punt_bio_submit(struct bio *bio);



static inline bool blkcg_punt_bio_submit(struct bio *bio)
@@ -540,50 +532,6 @@ static inline void blkcg_bio_issue_init(struct bio *bio) 
	bio_issue_init(&bio->bi_issue, bio_sectors(bio));

}



static inline bool blkcg_bio_issue_check(struct request_queue *q,

					 struct bio *bio)

{

	struct blkcg_gq *blkg = bio->bi_blkg;

	bool throtl = false;



	throtl = blk_throtl_bio(q, blkg, bio);

	if (!throtl) {

		struct blkg_iostat_set *bis;

		int rwd, cpu;



		if (op_is_discard(bio->bi_opf))

			rwd = BLKG_IOSTAT_DISCARD;

		else if (op_is_write(bio->bi_opf))

			rwd = BLKG_IOSTAT_WRITE;

		else

			rwd = BLKG_IOSTAT_READ;



		cpu = get_cpu();

		bis = per_cpu_ptr(blkg->iostat_cpu, cpu);

		u64_stats_update_begin(&bis->sync);



		/*

		 * If the bio is flagged with BIO_CGROUP_ACCT it means this is a

		 * split bio and we would have already accounted for the size of

		 * the bio.

		 */

		if (!bio_flagged(bio, BIO_CGROUP_ACCT)) {

			bio_set_flag(bio, BIO_CGROUP_ACCT);

			bis->cur.bytes[rwd] += bio->bi_iter.bi_size;

		}

		bis->cur.ios[rwd]++;



		u64_stats_update_end(&bis->sync);

		if (cgroup_subsys_on_dfl(io_cgrp_subsys))

			cgroup_rstat_updated(blkg->blkcg->css.cgroup, cpu);

		put_cpu();

	}



	blkcg_bio_issue_init(bio);



	return !throtl;

}



static inline void blkcg_use_delay(struct blkcg_gq *blkg)

{

	if (WARN_ON_ONCE(atomic_read(&blkg->use_delay) < 0))
@@ -657,6 +605,7 @@ static inline void blkcg_clear_delay(struct blkcg_gq *blkg) 
		atomic_dec(&blkg->blkcg->css.cgroup->congestion_count);

}



void blk_cgroup_bio_start(struct bio *bio);

void blkcg_add_delay(struct blkcg_gq *blkg, u64 now, u64 delta);

void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay);

void blkcg_maybe_throttle_current(void);
@@ -710,8 +659,7 @@ static inline void blkg_put(struct blkcg_gq *blkg) { } 


static inline bool blkcg_punt_bio_submit(struct bio *bio) { return false; }

static inline void blkcg_bio_issue_init(struct bio *bio) { }

static inline bool blkcg_bio_issue_check(struct request_queue *q,

					 struct bio *bio) { return true; }

static inline void blk_cgroup_bio_start(struct bio *bio) { }



#define blk_queue_for_each_rl(rl, q)	\

	for ((rl) = &(q)->root_rl; (rl); (rl) = NULL)

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