block: stop using bio_data() in blk_write_same_mergeable

While the Write Same page currently always is in low-level it is just
as easy and safer to just compare the page and offset directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 22cfba64ce81..0deed7274a7f 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -815,7 +815,8 @@ static inline bool rq_mergeable(struct request *rq)
 
 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
 {
-        if (bio_data(a) == bio_data(b))
+        if (bio_page(a) == bio_page(b) &&
+            bio_offset(a) == bio_offset(b))
                 return true;
 
         return false;