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block: simplify blk_recalc_rq_segments

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Return the segement and let the callers assign them, which makes the code
a littler more obvious.  Also pass the request instead of q plus bio
chain, allowing for the use of rq_for_each_bvec.

Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-06 12:29:02 +02:00 • committed by Jens Axboe
commit e9cd19c0c1
3 changed files with 9 additions and 18 deletions
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21
block/blk-merge.c
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@ -310,17 +310,16 @@ void blk_queue_split(struct request_queue *q, struct bio **bio)
}
EXPORT_SYMBOL(blk_queue_split);
static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
struct bio *bio)
unsigned int blk_recalc_rq_segments(struct request *rq)
{
unsigned int nr_phys_segs = 0;
struct bvec_iter iter;
struct req_iterator iter;
struct bio_vec bv;
if (!bio)
if (!rq->bio)
return 0;
switch (bio_op(bio)) {
switch (bio_op(rq->bio)) {
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
case REQ_OP_WRITE_ZEROES:
@ -329,19 +328,11 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
return 1;
}
for_each_bio(bio) {
bio_for_each_bvec(bv, bio, iter)
bvec_split_segs(q, &bv, &nr_phys_segs, NULL, UINT_MAX);
}
rq_for_each_bvec(bv, rq, iter)
bvec_split_segs(rq->q, &bv, &nr_phys_segs, NULL, UINT_MAX);
return nr_phys_segs;
}
void blk_recalc_rq_segments(struct request *rq)
{
rq->nr_phys_segments = __blk_recalc_rq_segments(rq->q, rq->bio);
}
static inline struct scatterlist *blk_next_sg(struct scatterlist **sg,
struct scatterlist *sglist)
{