block: clean up __bio_add_pc_page a bit

Share the bi_size update by moving the done label up, and duplicate
the bv_len update in the two callers to get rid of the bvec_merge
label.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index de26dc1..029afb1 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -731,9 +731,7 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
                    offset == bvec->bv_offset + bvec->bv_len) {
                        if (put_same_page)
                                put_page(page);
- bvec_merge:
                        bvec->bv_len += len;
-                       bio->bi_iter.bi_size += len;
                        goto done;
                }
 
@@ -745,8 +743,10 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
                        return 0;
 
                if (page_is_mergeable(bvec, page, len, offset, false) &&
-                               can_add_page_to_seg(q, bvec, page, len, offset))
-                       goto bvec_merge;
+                   can_add_page_to_seg(q, bvec, page, len, offset)) {
+                       bvec->bv_len += len;
+                       goto done;
+               }
        }
 
        if (bio_full(bio))
@@ -760,9 +760,8 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
        bvec->bv_len = len;
        bvec->bv_offset = offset;
        bio->bi_vcnt++;
-       bio->bi_iter.bi_size += len;
-
  done:
+       bio->bi_iter.bi_size += len;
        bio->bi_phys_segments = bio->bi_vcnt;
        bio_set_flag(bio, BIO_SEG_VALID);
        return len;