linux-kernel - [PATCH V6 11/30] block: implement bio_pages_all() via bio_for_each_segment

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Date:   Sat,  9 Jun 2018 20:29:55 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>
Cc:     David Sterba <dsterba@...e.cz>, Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V6 11/30] block: implement bio_pages_all() via bio_for_each_segment_all()

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_segment_all() to
compute the number because we will keep bio_for_each_segment_all()
to iterate each page.

Signed-off-by: Ming Lei <ming.lei@...hat.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 e9f74c73bbe6..c17b8f80d650 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -339,8 +339,14 @@ 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_segment_all(bv, bio, i)
+		;
+	return i;
 }
 
 static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
-- 
2.9.5