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Commit 7754f669 authored by Dennis Zhou's avatar Dennis Zhou Committed by Jens Axboe
Browse files

blkcg: rename blkg_try_get() to blkg_tryget() 



blkg reference counting now uses percpu_ref rather than atomic_t. Let's
make this consistent with css_tryget. This renames blkg_try_get to
blkg_tryget and now returns a bool rather than the blkg or %NULL.

Signed-off-by: default avatarDennis Zhou <dennis@kernel.org>
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 7fcf2b03

block/bio.c

+1 −1
Original line number Diff line number Diff line
@@ -1990,7 +1990,7 @@ static void __bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) 
{

	bio_disassociate_blkg(bio);



	bio->bi_blkg = blkg_try_get_closest(blkg);

	bio->bi_blkg = blkg_tryget_closest(blkg);

}



/**

block/blk-cgroup.c

+1 −2
Original line number Diff line number Diff line
@@ -1736,8 +1736,7 @@ void blkcg_maybe_throttle_current(void) 
	blkg = blkg_lookup(blkcg, q);

	if (!blkg)

		goto out;

	blkg = blkg_try_get(blkg);

	if (!blkg)

	if (!blkg_tryget(blkg))

		goto out;

	rcu_read_unlock();

block/blk-iolatency.c

+1 −1
Original line number Diff line number Diff line
@@ -698,7 +698,7 @@ static void blkiolatency_timer_fn(struct timer_list *t) 
		 * We could be exiting, don't access the pd unless we have a

		 * ref on the blkg.

		 */

		if (!blkg_try_get(blkg))

		if (!blkg_tryget(blkg))

			continue;



		iolat = blkg_to_lat(blkg);

include/linux/blk-cgroup.h

+5 −7
Original line number Diff line number Diff line
@@ -491,27 +491,25 @@ static inline void blkg_get(struct blkcg_gq *blkg) 
}



/**

 * blkg_try_get - try and get a blkg reference

 * blkg_tryget - try and get a blkg reference

 * @blkg: blkg to get

 *

 * This is for use when doing an RCU lookup of the blkg.  We may be in the midst

 * of freeing this blkg, so we can only use it if the refcnt is not zero.

 */

static inline struct blkcg_gq *blkg_try_get(struct blkcg_gq *blkg)

static inline bool blkg_tryget(struct blkcg_gq *blkg)

{

	if (percpu_ref_tryget(&blkg->refcnt))

		return blkg;

	return NULL;

	return percpu_ref_tryget(&blkg->refcnt);

}



/**

 * blkg_try_get_closest - try and get a blkg ref on the closet blkg

 * blkg_tryget_closest - try and get a blkg ref on the closet blkg

 * @blkg: blkg to get

 *

 * This walks up the blkg tree to find the closest non-dying blkg and returns

 * the blkg that it did association with as it may not be the passed in blkg.

 */

static inline struct blkcg_gq *blkg_try_get_closest(struct blkcg_gq *blkg)

static inline struct blkcg_gq *blkg_tryget_closest(struct blkcg_gq *blkg)

{

	while (!percpu_ref_tryget(&blkg->refcnt))

		blkg = blkg->parent;