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authorMing Lei <ming.lei@redhat.com>2019-03-17 18:01:11 +0800
committerJens Axboe <axboe@kernel.dk>2019-04-01 12:11:48 -0600
commit16e3e4187758d8936d358b26149de785b7d5a9b7 (patch)
tree4c5002dc5deb5ebc1e68346c10a2f8eb59fc2b3c /block/blk-merge.c
parentcae6c2e54cc10514fec26e333f63c5cded9d2383 (diff)
block: reuse __blk_bvec_map_sg() for mapping page sized bvec
Inside __blk_segment_map_sg(), page sized bvec mapping is optimized a bit with one standalone branch. So reuse __blk_bvec_map_sg() to do that. Cc: Omar Sandoval <osandov@fb.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-merge.c')
-rw-r--r--block/blk-merge.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 9ec704bb58ec..3e934ee9a907 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -493,6 +493,14 @@ static unsigned blk_bvec_map_sg(struct request_queue *q,
return nsegs;
}
+static inline int __blk_bvec_map_sg(struct bio_vec bv,
+ struct scatterlist *sglist, struct scatterlist **sg)
+{
+ *sg = blk_next_sg(sg, sglist);
+ sg_set_page(*sg, bv.bv_page, bv.bv_len, bv.bv_offset);
+ return 1;
+}
+
static inline void
__blk_segment_map_sg(struct request_queue *q, struct bio_vec *bvec,
struct scatterlist *sglist, struct bio_vec *bvprv,
@@ -511,23 +519,13 @@ __blk_segment_map_sg(struct request_queue *q, struct bio_vec *bvec,
} else {
new_segment:
if (bvec->bv_offset + bvec->bv_len <= PAGE_SIZE) {
- *sg = blk_next_sg(sg, sglist);
- sg_set_page(*sg, bvec->bv_page, nbytes, bvec->bv_offset);
- (*nsegs) += 1;
+ (*nsegs) += __blk_bvec_map_sg(*bvec, sglist, sg);
} else
(*nsegs) += blk_bvec_map_sg(q, bvec, sglist, sg);
}
*bvprv = *bvec;
}
-static inline int __blk_bvec_map_sg(struct bio_vec bv,
- struct scatterlist *sglist, struct scatterlist **sg)
-{
- *sg = sglist;
- sg_set_page(*sg, bv.bv_page, bv.bv_len, bv.bv_offset);
- return 1;
-}
-
static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
struct scatterlist *sglist,
struct scatterlist **sg)