blk_rq_map_integrity

Name:lk_rq_map_integrity_sg - Map integrity metadata into a scatterlist*@q: request queue*@bio: bio with integrity metadata attached*@sglist: target scatterlist* Description: Map the integrity vectors in request into a* scatterlist

Proto:int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio, struct scatterlist *sglist)

Type:int

Parameter:

Type	Parameter	Name
struct request_queue *	q
struct bio *	bio
struct scatterlist *	sglist

struct bio_vec iv, ivprv = {NULL}

struct scatterlist * sg = NULL

segments = 0

prev = 0

bio_for_each_integrity_vec(iv, bio, iter)

If prev Then

If Not biovec_phys_mergeable(q, & ivprv, & iv) Then Go to new_segment

If length + bv_len > queue_max_segment_size(q) Then Go to new_segment

length += bv_len

Else

new_segment :

If Not sg Then sg = sglist

Else

sg_unmark_end - Undo setting the end of the scatterlist*@sg: SG entryScatterlist* Description:* Removes the termination marker from the given entry of the scatterlist.

sg = sg_next - return the next scatterlist entry in a list*@sg: The current sg entry* Description:* Usually the next entry will be @sg@ + 1, but if this sg element is part* of a chained scatterlist, it could jump to the start of a new* scatterlist array.

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

segments++

prev = 1

100

ivprv = iv

103

If sg Then sg_mark_end - Mark the end of the scatterlist*@sg: SG entryScatterlist* Description:* Marks the passed in sg entry as the termination point for the sg* table. A call to sg_next() on this entry will return NULL.

106

Return segments

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