Preparing for supporting multi-page bvec.

Reviewed-by: Omar Sandoval <osan...@fb.com>
Signed-off-by: Ming Lei <ming....@redhat.com>
---
 fs/btrfs/extent_io.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index dc8ba3ee515d..c092f88700bd 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2697,11 +2697,12 @@ static int __must_check submit_one_bio(struct bio *bio, 
int mirror_num,
 {
        blk_status_t ret = 0;
        struct bio_vec *bvec = bio_last_bvec_all(bio);
-       struct page *page = bvec->bv_page;
+       struct bio_vec bv;
        struct extent_io_tree *tree = bio->bi_private;
        u64 start;
 
-       start = page_offset(page) + bvec->bv_offset;
+       bvec_last_segment(bvec, &bv);
+       start = page_offset(bv.bv_page) + bv.bv_offset;
 
        bio->bi_private = NULL;
 
-- 
2.9.5

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