diff --git a/block/blk.h b/block/blk.h
index d88549d..0833940 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -1,11 +1,28 @@
 #ifndef BLK_INTERNAL_H
 #define BLK_INTERNAL_H
 
+/* Amount of time in which a process may batch requests */
+#define BLK_BATCH_TIME	(HZ/50UL)
+
+/* Number of requests a "batching" process may submit */
+#define BLK_BATCH_REQ	32
+
 extern struct kmem_cache *blk_requestq_cachep;
 extern struct kobj_type blk_queue_ktype;
 
+void rq_init(struct request_queue *q, struct request *rq);
+void init_request_from_bio(struct request *req, struct bio *bio);
+void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
+			struct bio *bio);
+int ll_back_merge_fn(struct request_queue *q, struct request *req,
+		     struct bio *bio);
 void __blk_queue_free_tags(struct request_queue *q);
 
+void blk_unplug_work(struct work_struct *work);
+void blk_unplug_timeout(unsigned long data);
+
+struct io_context *current_io_context(gfp_t gfp_flags, int node);
+
 void blk_queue_congestion_threshold(struct request_queue *q);
 
 /*