root/include/linux/raid_class.h

/*
 * 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_3,
        RAID_LEVEL_4,
        RAID_LEVEL_5,
        RAID_LEVEL_50,
        RAID_LEVEL_6,
};

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 *);