1 files changed, 59 insertions, 0 deletions

diff --git a/include/linux/raid_class.h b/include/linux/raid_class.h
new file mode 100644
index 000000000000..a71123c28272
--- /dev/null
+++ b/include/linux/raid_class.h
@@ -0,0 +1,59 @@
+/*
+ */
+#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_ACTIVE = 1,
+        RAID_DEGRADED,
+        RAID_RESYNCING,
+        RAID_OFFLINE,
+};
+
+struct raid_data {
+        struct list_head component_list;
+        int component_count;
+        int level;
+        enum raid_state state;
+        int resync;
+};
+
+#define DEFINE_RAID_ATTRIBUTE(type, attr)                                     \
+static inline void                                                            \
+raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
+        struct class_device *cdev =                                           \
+                attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
+        struct raid_data *rd;                                                 \
+        BUG_ON(!cdev);                                                        \
+        rd = class_get_devdata(cdev);                                         \
+        rd->attr = value;                                                     \
+}                                                                             \
+static inline type                                                            \
+raid_get_##attr(struct raid_template *r, struct device *dev) {                \
+        struct class_device *cdev =                                           \
+                attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
+        struct raid_data *rd;                                                 \
+        BUG_ON(!cdev);                                                        \
+        rd = class_get_devdata(cdev);                                         \
+        return rd->attr;                                                      \
+}
+
+DEFINE_RAID_ATTRIBUTE(int, 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 *);
+
+void raid_component_add(struct raid_template *, struct device *,
+                        struct device *);