dm: fold __clone_and_map_data_bio into __split_and_process_bio

Fold __clone_and_map_data_bio into its only caller.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm.c

@@ -1207,25 +1207,6 @@ static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len)
 	bio->bi_iter.bi_size = to_bytes(len);
 }
 
-/*
- * Creates a bio that consists of range of complete bvecs.
- */
-static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,
-				    sector_t sector, unsigned *len)
-{
-	struct bio *bio = ci->bio, *clone;
-
-	clone = alloc_tio(ci, ti, 0, len, GFP_NOIO);
-	bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
-	clone->bi_iter.bi_size = to_bytes(*len);
-
-	if (bio_integrity(bio))
-		bio_integrity_trim(clone);
-
-	__map_bio(clone);
-	return 0;
-}
-
 static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
 				struct dm_target *ti, unsigned num_bios,
 				unsigned *len)
@@ -1380,6 +1361,7 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
  */
 static int __split_and_process_bio(struct clone_info *ci)
 {
+	struct bio *clone;
 	struct dm_target *ti;
 	unsigned len;
 	int r;
@@ -1393,9 +1375,13 @@ static int __split_and_process_bio(struct clone_info *ci)
 
 	len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count);
 
-	r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
-	if (r < 0)
-		return r;
+	clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO);
+	bio_advance(clone, to_bytes(ci->sector - clone->bi_iter.bi_sector));
+	clone->bi_iter.bi_size = to_bytes(len);
+	if (bio_integrity(clone))
+		bio_integrity_trim(clone);
+
+	__map_bio(clone);
 
 	ci->sector += len;
 	ci->sector_count -= len;