blkg_lookup

Name:lkg_lookup_create - find or create a blkg*@blkcg: target block cgroup*@q: target request_queue* This looks up or creates the blkg representing the unique pair* of the blkcg and the request_queue.

Proto:struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg, struct request_queue *q)

Type:struct blkcg_gq

Parameter:

Type	Parameter	Name
struct blkcg *	blkcg
struct request_queue *	q

383

blkg = lkg_lookup - lookup blkg for the specified blkcg - q pair*@blkcg: blkcg of interest*@q: request_queue of interest* Lookup blkg for the @blkcg - @q pair. This function should be called* under RCU read lock.

385

If Value for the false possibility is greater at compile time(!blkg) Then

388

spin_lock_irqsave( & queue_lock, flags)

389

blkg = __blkg_lookup_create - lookup blkg, try to create one if not there*@blkcg: blkcg of interest*@q: request_queue of interest* Lookup blkg for the @blkcg - @q pair. If it doesn't exist, try to* create one

390

spin_unlock_irqrestore( & queue_lock, flags)

393

Return blkg

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