blk_attempt_plug_merge

函数名称：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

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

返回类型：bool

参数：

类型	参数	名称
struct request_queue *	q
struct bio *	bio
unsigned int	nr_segs
struct request **	same_queue_rq

702

plug等于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

如果非plug则返回:false

706

plug_list等于lk-mq requests

709

bool merged = false

711

如果q恒等于q且same_queue_rq则

717

same_queue_rq等于rq

720

如果q不等于q或非blk_rq_merge_ok(rq, bio)则继续下一循环

724

当:blk_try_merge(rq, bio)恒等于ELEVATOR_BACK_MERGE

725

merged等于bio_attempt_back_merge(rq, bio, nr_segs)

726

727

当:blk_try_merge(rq, bio)恒等于ELEVATOR_FRONT_MERGE

728

merged等于bio_attempt_front_merge(rq, bio, nr_segs)

729

730

当:blk_try_merge(rq, bio)恒等于ELEVATOR_DISCARD_MERGE

731

merged等于bio_attempt_discard_merge(q, rq, bio)

732

733

默认

734

737

如果merged则返回:true

741

返回:false

**调用者**
名称	描述
blk_mq_make_request

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码