__blk_mq_sched_bio_merge

Name:__blk_mq_sched_bio_merge

Proto:bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio, unsigned int nr_segs)

Type:bool

Parameter:

Type	Parameter	Name
struct request_queue *	q
struct bio *	bio
unsigned int	nr_segs

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ctx = This assumes per-cpu software queueing queues. They could be per-node* as well, for instance. For now this is hardcoded as-is. Note that we don't* care about preemption, since we know the ctx's are persistent. This does

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hctx = lk_mq_map_queue() - map (cmd_flags,type) to hardware queue*@q: request queue*@flags: request command flags*@cpu: cpu ctx

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bool ret = false

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If e && bio_merge Then Return bio_merge(hctx, bio, nr_segs)

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type = @type: HCTX_TYPE_* flags. Type of hardware queue.

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If @flags: BLK_MQ_F_* flags. Defines the behaviour of the queue. & BLK_MQ_F_SHOULD_MERGE && Not list_empty_careful - tests whether a list is empty and not being modified*@head: the list to test* Description:* tests whether a list is empty _and_ checks that no other CPU might be* in the process of modifying either member (next or prev)* NOTE: using Then

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spin_lock( & lock)

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ret = Reverse check our software queue for entries that we could potentially* merge with. Currently includes a hand-wavy stop count of 8, to not spend* too much time checking for merges.

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spin_unlock( & lock)

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Return ret

**Caller**
Name	Describe
blk_mq_sched_bio_merge

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