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/*
 * 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,
};

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 *);

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