blk_bvec_map_sg

Name:blk_bvec_map_sg

Proto:static unsigned blk_bvec_map_sg(struct request_queue *q, struct bio_vec *bvec, struct scatterlist *sglist, struct scatterlist **sg)

Type:unsigned

Parameter:

Type	Parameter	Name
struct request_queue *	q
struct bio_vec *	bvec
struct scatterlist *	sglist
struct scatterlist **	sg

421

nbytes = bv_len

422

nsegs = 0 , total = 0

424

When nbytes > 0 cycle

425

offset = bv_offset + total

426

len = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(get_max_segment_size(q, bv_page, offset), nbytes)

428

438

page += offset >> PAGE_SHIFT determines the page size

439

offset &= ~PAGE_MASK

441

sg = blk_next_sg(sg, sglist)

442

sg_set_page - Set sg entry to point at given page*@sg: SG entry*@page: The page*@len: Length of data*@offset: Offset into page* Description:* Use this function to set an sg entry pointing at a page, never assign* the page directly

444

total += len

445

446

nsegs++

449

Return nsegs

**Caller**
Name	Describe
__blk_bios_map_sg

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