v4.19.13 snapshot.
diff --git a/include/linux/raid_class.h b/include/linux/raid_class.h
new file mode 100644
index 0000000..ec86555
--- /dev/null
+++ b/include/linux/raid_class.h
@@ -0,0 +1,84 @@
+/*
+ * raid_class.h - a generic raid visualisation class
+ *
+ * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
+ *
+ * This file is licensed under GPLv2
+ */
+#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 *);
+
+int __must_check raid_component_add(struct raid_template *, struct device *,
+ struct device *);
+