1 files changed, 52 insertions, 0 deletions
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
new file mode 100644
index 000000000..ba6cca584
--- /dev/null
+++ b/block/blk-wbt.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef WB_THROTTLE_H
+#define WB_THROTTLE_H
+
+#ifdef CONFIG_BLK_WBT
+
+int wbt_init(struct gendisk *disk);
+void wbt_disable_default(struct gendisk *disk);
+void wbt_enable_default(struct gendisk *disk);
+
+u64 wbt_get_min_lat(struct request_queue *q);
+void wbt_set_min_lat(struct request_queue *q, u64 val);
+bool wbt_disabled(struct request_queue *);
+
+void wbt_set_write_cache(struct request_queue *, bool);
+
+u64 wbt_default_latency_nsec(struct request_queue *);
+
+#else
+
+static inline int wbt_init(struct gendisk *disk)
+{
+	return -EINVAL;
+}
+static inline void wbt_disable_default(struct gendisk *disk)
+{
+}
+static inline void wbt_enable_default(struct gendisk *disk)
+{
+}
+static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
+{
+}
+static inline u64 wbt_get_min_lat(struct request_queue *q)
+{
+	return 0;
+}
+static inline void wbt_set_min_lat(struct request_queue *q, u64 val)
+{
+}
+static inline u64 wbt_default_latency_nsec(struct request_queue *q)
+{
+	return 0;
+}
+static inline bool wbt_disabled(struct request_queue *q)
+{
+	return true;
+}
+
+#endif /* CONFIG_BLK_WBT */
+
+#endif