[PATCH V11 09/19] btrfs: move bio_pages_all() to btrfs

[Ming Lei]

BTRFS is the only user of this helper, so move this helper into
BTRFS, and implement it via bio_for_each_segment_all(), since
bio->bi_vcnt may not equal to number of pages after multipage bvec
is enabled.

Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
 fs/btrfs/extent_io.c | 14 +++++++++++++-
 include/linux/bio.h  |  6 ------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5d5965297e7e..874bb9aeebdc 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2348,6 +2348,18 @@ struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 	return bio;
 }
 
+static unsigned btrfs_bio_pages_all(struct bio *bio)
+{
+	unsigned i;
+	struct bio_vec *bv;
+
+	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
+
+	bio_for_each_segment_all(bv, bio, i)
+		;
+	return i;
+}
+
 /*
  * this is a generic handler for readpage errors (default
  * readpage_io_failed_hook). if other copies exist, read those and write back
@@ -2368,7 +2380,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
 	int read_mode = 0;
 	blk_status_t status;
 	int ret;
-	unsigned failed_bio_pages = bio_pages_all(failed_bio);
+	unsigned failed_bio_pages = btrfs_bio_pages_all(failed_bio);
 
 	BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
 
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7560209d6a8a..9d6284f53c07 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -282,12 +282,6 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv)
 		bv->bv_len = iter.bi_bvec_done;
 }
 
-static inline unsigned bio_pages_all(struct bio *bio)
-{
-	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
-	return bio->bi_vcnt;
-}
-
 static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
 {
 	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
-- 
2.9.5