block: simplify blk_recalc_rq_segments
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 <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 72b4fd8..2ea21ff 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -310,17 +310,16 @@
}
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 @@
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)
{