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Commit 6bad9b21 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

blkcg: Introduce blkg_root_lookup() 



This new function will be used in a later patch to verify whether a
queue has been dissociated from the cgroup controller before being
released.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@wdc.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Alexandru Moise <00moses.alexander00@gmail.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b1f4267c

include/linux/blk-cgroup.h

+18 −0
Original line number Original line Diff line number Diff line
@@ -341,6 +341,23 @@ static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, 
	return __blkg_lookup(blkcg, q, false);

	return __blkg_lookup(blkcg, q, false);

}

}





/**

 * blkg_lookup - look up blkg for the specified request queue

 * @q: request_queue of interest

 *

 * Lookup blkg for @q at the root level. See also blkg_lookup().

 */

static inline struct blkcg_gq *blkg_root_lookup(struct request_queue *q)

{

	struct blkcg_gq *blkg;



	rcu_read_lock();

	blkg = blkg_lookup(&blkcg_root, q);

	rcu_read_unlock();



	return blkg;

}



/**

/**

 * blkg_to_pdata - get policy private data

 * blkg_to_pdata - get policy private data

 * @blkg: blkg of interest

 * @blkg: blkg of interest
@@ -864,6 +881,7 @@ static inline bool blk_cgroup_congested(void) { return false; } 
static inline void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay) { }

static inline void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay) { }





static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }

static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }

static inline struct blkcg_gq *blkg_root_lookup(struct request_queue *q) { return NULL; }

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

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

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

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

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

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