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blkcg: rename blkg_try_get to blkg_tryget

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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: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dennis Zhou (Facebook) 2018-09-11 14:41:37 -04:00 • committed by Jens Axboe
parent b3b9f24f5f
commit 101246ec02
4 changed files with 9 additions and 12 deletions
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14
include/linux/blk-cgroup.h
View file

@ -494,27 +494,25 @@ 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;
@ -599,7 +597,7 @@ static inline struct request_list *blk_get_rl(struct request_queue *q,
if (unlikely(!blkg))
blkg = __blkg_lookup_create(blkcg, q);
if (!blkg_try_get(blkg))
if (!blkg_tryget(blkg))
goto rl_use_root;
rcu_read_unlock();