+#if defined(CONFIG_BFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP)
+static void bfq_update_insert_stats(struct request_queue *q,
+ struct bfq_queue *bfqq,
+ bool idle_timer_disabled,
+ unsigned int cmd_flags)
+{
+ if (!bfqq)
+ return;
+
+ /*
+ * bfqq still exists, because it can disappear only after
+ * either it is merged with another queue, or the process it
+ * is associated with exits. But both actions must be taken by
+ * the same process currently executing this flow of
+ * instructions.
+ *
+ * In addition, the following queue lock guarantees that
+ * bfqq_group(bfqq) exists as well.
+ */
+ spin_lock_irq(q->queue_lock);
+ bfqg_stats_update_io_add(bfqq_group(bfqq), bfqq, cmd_flags);
+ if (idle_timer_disabled)
+ bfqg_stats_update_idle_time(bfqq_group(bfqq));
+ spin_unlock_irq(q->queue_lock);
+}
+#else
+static inline void bfq_update_insert_stats(struct request_queue *q,
+ struct bfq_queue *bfqq,
+ bool idle_timer_disabled,
+ unsigned int cmd_flags) {}
+#endif
+
+static void bfq_prepare_request(struct request *rq, struct bio *bio);
+