blk_rq_append_bio

Name:Append a bio to a passthrough request. Only works if the bio can be merged* into the request based on the driver constraints.

Proto:int blk_rq_append_bio(struct request *rq, struct bio **bio)

Type:int

Parameter:

Type	Parameter	Name
struct request *	rq
struct bio **	bio

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nr_segs = 0

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blk_queue_bounce(q, bio)

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rate over multi-page bvec (bv, * bio, iter)

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If Not bio Then

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blk_rq_bio_prep(rq, * bio, nr_segs)

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Else

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If Not ll_back_merge_fn(rq, * bio, nr_segs) Then

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If orig_bio != bio Then

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_put - release a reference to a bio*@bio: bio to release reference to* Description:* Put a reference to a &struct bio, either one you have gotten with* bio_alloc, bio_get or bio_clone_*. The last put of a bio will free it.

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Return -EINVAL

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request queue link = bio

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total data len += residual I/O count

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Return 0

**Caller**
Name	Describe
__blk_rq_map_user_iov
blk_rq_map_kern	lk_rq_map_kern - map kernel data to a request, for passthrough requests@q: request queue where request should be inserted@rq: request to fill@kbuf: the kernel buffer@len: length of user data@gfp_mask: memory allocation flags Description:

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