Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all

Bio iterated by set_bio_pages_uptodate() is raid56 internal one, so it
will never be a BIO_CLONED bio, and since this is called by end_io
functions, bio->bi_iter.bi_size is zero, we mustn't use
bio_for_each_segment() as that is a no-op if bi_size is zero.

Fixes: 6592e58c6b68e61f003a01ba29a3716e7e2e9484 ("Btrfs: fix write corruption due to bio cloning on raid5/6")
Cc: <stable@vger.kernel.org> # v4.12-rc6+
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 7b382ee..f86ba6a 100644 (file)
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -1441,14 +1441,13 @@ static int fail_bio_stripe(struct btrfs_raid_bio *rbio,
  */
 static void set_bio_pages_uptodate(struct bio *bio)
 {
-       struct bio_vec bvec;
-       struct bvec_iter iter;
+       struct bio_vec *bvec;
+       int i;
 
-       if (bio_flagged(bio, BIO_CLONED))
-               bio->bi_iter = btrfs_io_bio(bio)->iter;
+       ASSERT(!bio_flagged(bio, BIO_CLONED));
 
-       bio_for_each_segment(bvec, bio, iter)
-               SetPageUptodate(bvec.bv_page);
+       bio_for_each_segment_all(bvec, bio, i)
+               SetPageUptodate(bvec->bv_page);
 }
 
 /*