[PATCH V4 25/45] block: implement bio_pages_all() via bio_for_each_page_all()

Ming Lei
2017-12-18T12:29:30Z

As multipage bvec will be enabled soon, bio->bi_vcnt isn't same with
page count in the bio any more, so use bio_for_each_page_all() to
compute the number.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
include/linux/bio.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 0cb29c73ff27..2dd1ca0285e1 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -330,8 +330,14 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv)

static inline unsigned bio_pages_all(struct bio *bio)
{
+ unsigned i;
+ struct bio_vec *bv;
+
WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
- return bio->bi_vcnt;
+
+ bio_for_each_page_all(bv, bio, i)
+ ;
+ return i;
}

static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
--
2.9.5