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[V7,17/24] btrfs: move bio_pages_all() to btrfs

Message ID 20180627124548.3456-18-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei June 27, 2018, 12:45 p.m. UTC 
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(-)
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Patch

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);