block: move req_gap_back_merge to blk.h

No need to expose these helpers outside the block layer.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/blk.h

@@ -149,6 +149,25 @@ static inline void blk_queue_enter_live(struct request_queue *q)
 	percpu_ref_get(&q->q_usage_counter);
 }
 
+static inline bool __bvec_gap_to_prev(struct request_queue *q,
+		struct bio_vec *bprv, unsigned int offset)
+{
+	return offset ||
+		((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
+}
+
+/*
+ * Check if adding a bio_vec after bprv with offset would create a gap in
+ * the SG list. Most drivers don't care about this, but some do.
+ */
+static inline bool bvec_gap_to_prev(struct request_queue *q,
+		struct bio_vec *bprv, unsigned int offset)
+{
+	if (!queue_virt_boundary(q))
+		return false;
+	return __bvec_gap_to_prev(q, bprv, offset);
+}
+
 #ifdef CONFIG_BLK_DEV_INTEGRITY
 void blk_flush_integrity(void);
 bool __bio_integrity_endio(struct bio *);

include/linux/blkdev.h

@@ -1676,25 +1676,6 @@ static inline void put_dev_sector(Sector p)
 	put_page(p.v);
 }
 
-static inline bool __bvec_gap_to_prev(struct request_queue *q,
-				struct bio_vec *bprv, unsigned int offset)
-{
-	return offset ||
-		((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
-}
-
-/*
- * Check if adding a bio_vec after bprv with offset would create a gap in
- * the SG list. Most drivers don't care about this, but some do.
- */
-static inline bool bvec_gap_to_prev(struct request_queue *q,
-				struct bio_vec *bprv, unsigned int offset)
-{
-	if (!queue_virt_boundary(q))
-		return false;
-	return __bvec_gap_to_prev(q, bprv, offset);
-}
-
 int kblockd_schedule_work(struct work_struct *work);
 int kblockd_schedule_work_on(int cpu, struct work_struct *work);
 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);