blk_attempt_plug_merge

Name:lk_attempt_plug_merge - try to merge with %current's plugged list*@q: request_queue new bio is being queued at*@bio: new bio being queued*@nr_segs: number of segments in @bio*@same_queue_rq: pointer to &struct request that gets filled in when* another

Proto:bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, unsigned int nr_segs, struct request **same_queue_rq)

Type:bool

Parameter:

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

702

plug = lk_mq_plug() - Get caller context plug*@q: request queue*@bio : the bio being submitted by the caller context* Plugging, by design, may delay the insertion of BIOs into the elevator in* order to increase BIO merging opportunities

703

If Not plug Then Return false

706

plug_list = lk-mq requests

709

bool merged = false

711

If q == q && same_queue_rq Then

717

same_queue_rq = rq

720

If q != q || Not blk_rq_merge_ok(rq, bio) Then Continue

724

Case blk_try_merge(rq, bio) == ELEVATOR_BACK_MERGE

725

merged = bio_attempt_back_merge(rq, bio, nr_segs)

726

Break

727

Case blk_try_merge(rq, bio) == ELEVATOR_FRONT_MERGE

728

merged = bio_attempt_front_merge(rq, bio, nr_segs)

729

Break

730

Case blk_try_merge(rq, bio) == ELEVATOR_DISCARD_MERGE

731

merged = bio_attempt_discard_merge(q, rq, bio)

732

Break

733

Default

734

Break

737

If merged Then Return true

741

Return false

**Caller**
Name	Describe
blk_mq_make_request

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion