direct-io: use bio_release_pages in dio_bio_complete

Use bio_release_pages instead of duplicating it.
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/direct-io.c

@@ -538,8 +538,8 @@ static struct bio *dio_await_one(struct dio *dio)
  */
 static blk_status_t dio_bio_complete(struct dio *dio, struct bio *bio)
 {
-	struct bio_vec *bvec;
 	blk_status_t err = bio->bi_status;
+	bool should_dirty = dio->op == REQ_OP_READ && dio->should_dirty;
 
 	if (err) {
 		if (err == BLK_STS_AGAIN && (bio->bi_opf & REQ_NOWAIT))
@@ -548,19 +548,10 @@ static blk_status_t dio_bio_complete(struct dio *dio, struct bio *bio)
 			dio->io_error = -EIO;
 	}
 
-	if (dio->is_async && dio->op == REQ_OP_READ && dio->should_dirty) {
+	if (dio->is_async && should_dirty) {
 		bio_check_pages_dirty(bio);	/* transfers ownership */
 	} else {
-		struct bvec_iter_all iter_all;
-
-		bio_for_each_segment_all(bvec, bio, iter_all) {
-			struct page *page = bvec->bv_page;
-
-			if (dio->op == REQ_OP_READ && !PageCompound(page) &&
-					dio->should_dirty)
-				set_page_dirty_lock(page);
-			put_page(page);
-		}
+		bio_release_pages(bio, should_dirty);
 		bio_put(bio);
 	}
 	return err;