bio_attempt_discard_merge

Name:bio_attempt_discard_merge

Proto:bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, struct bio *bio)

Type:bool

Parameter:

Type	Parameter	Name
struct request_queue *	q
struct request *	req
struct bio *	bio

651

segments = Number of discard segments (or ranges) the driver needs to fill in.* Each discard bio merged into a request is counted as one segment.

653

If segments >= queue_max_discard_segments(q) Then Go to no_merge

655

If blk_rq_sectors(req) + bio_sectors(bio) > blk_rq_get_max_sectors(req, lk_rq_pos() : the current sector* blk_rq_bytes() : bytes left in the entire request* blk_rq_cur_bytes() : bytes left in the current segment* blk_rq_err_bytes() : bytes left till the next error boundary* blk_rq_sectors() : sectors left in the entire ) Then Go to no_merge

659

rq_qos_merge(q, req, bio)

661

request queue link = bio

662

663

total data len += residual I/O count

664

* Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed. = segments + 1

666

blk_account_io_start(req, false)

667

Return true

668

669

req_set_nomerge(q, req)

670

Return false

**Caller**
Name	Describe
blk_attempt_plug_merge	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
blk_mq_sched_try_merge
blk_mq_bio_list_merge	Iterate list of requests and see if we can merge this bio with any* of them.

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