+static void blk_wb_stat_get(void *data, struct blk_rq_stat *stat)
+{
+ blk_queue_stat_get(data, stat);
+}
+
+static void blk_wb_stat_clear(void *data)
+{
+ blk_stat_clear(data);
+}
+
+static bool blk_wb_stat_is_current(struct blk_rq_stat *stat)
+{
+ return blk_stat_is_current(stat);
+}
+
+static struct wb_stat_ops wb_stat_ops = {
+ .get = blk_wb_stat_get,
+ .is_current = blk_wb_stat_is_current,
+ .clear = blk_wb_stat_clear,
+};
+
+static void blk_wb_init(struct request_queue *q)
+{
+#ifndef CONFIG_BLK_WBT_MQ
+ if (q->mq_ops)
+ return;
+#endif
+#ifndef CONFIG_BLK_WBT_SQ
+ if (q->request_fn)
+ return;
+#endif
+
+ /*
+ * If this fails, we don't get throttling
+ */
+ wbt_init(q, &wb_stat_ops);
+}
+