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Subject[PATCH V7 17/24] btrfs: move bio_pages_all() to btrfs
Date
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.

Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: David Sterba <dsterba@suse.com>
Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
fs/btrfs/extent_io.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0b5e07723f5f..9fce9f0793fe 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2356,6 +2356,18 @@ 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
@@ -2376,7 +2388,7 @@ 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);

--
2.9.5
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