1 files changed, 79 insertions, 0 deletions
diff --git a/include/linux/raid_class.h b/include/linux/raid_class.h
new file mode 100644
index 000000000..772d45b2a
--- /dev/null
+++ b/include/linux/raid_class.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * raid_class.h - a generic raid visualisation class
+ *
+ * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
+ */
+#include <linux/transport_class.h>
+
+struct raid_template {
+	struct transport_container raid_attrs;
+};
+
+struct raid_function_template {
+	void *cookie;
+	int (*is_raid)(struct device *);
+	void (*get_resync)(struct device *);
+	void (*get_state)(struct device *);
+};
+
+enum raid_state {
+	RAID_STATE_UNKNOWN = 0,
+	RAID_STATE_ACTIVE,
+	RAID_STATE_DEGRADED,
+	RAID_STATE_RESYNCING,
+	RAID_STATE_OFFLINE,
+};
+
+enum raid_level {
+	RAID_LEVEL_UNKNOWN = 0,
+	RAID_LEVEL_LINEAR,
+	RAID_LEVEL_0,
+	RAID_LEVEL_1,
+	RAID_LEVEL_10,
+	RAID_LEVEL_1E,
+	RAID_LEVEL_3,
+	RAID_LEVEL_4,
+	RAID_LEVEL_5,
+	RAID_LEVEL_50,
+	RAID_LEVEL_6,
+	RAID_LEVEL_JBOD,
+};
+
+struct raid_data {
+	struct list_head component_list;
+	int component_count;
+	enum raid_level level;
+	enum raid_state state;
+	int resync;
+};
+
+/* resync complete goes from 0 to this */
+#define RAID_MAX_RESYNC		(10000)
+
+#define DEFINE_RAID_ATTRIBUTE(type, attr)				      \
+static inline void							      \
+raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
+	struct device *device =						      \
+		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
+	struct raid_data *rd;						      \
+	BUG_ON(!device);						      \
+	rd = dev_get_drvdata(device);					      \
+	rd->attr = value;						      \
+}									      \
+static inline type							      \
+raid_get_##attr(struct raid_template *r, struct device *dev) {		      \
+	struct device *device =						      \
+		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
+	struct raid_data *rd;						      \
+	BUG_ON(!device);						      \
+	rd = dev_get_drvdata(device);					      \
+	return rd->attr;						      \
+}
+
+DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
+DEFINE_RAID_ATTRIBUTE(int, resync)
+DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
+	
+struct raid_template *raid_class_attach(struct raid_function_template *);
+void raid_class_release(struct raid_template *);