Release 4.7 drivers/md/bcache/sysfs.h

#ifndef _BCACHE_SYSFS_H_

#define _BCACHE_SYSFS_H_


#define KTYPE(type)							\
struct kobj_type type ## _ktype = {                                     \
        .release        = type ## _release,                             \
        .sysfs_ops      = &((const struct sysfs_ops) {                  \
                .show   = type ## _show,                                \
                .store  = type ## _store                                \
        }),                                                             \
        .default_attrs  = type ## _files                                \
}


#define SHOW(fn)							\
static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
                           char *buf)                                   \

#define STORE(fn)                                                       \
static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
                            const char *buf, size_t size)               \

#define SHOW_LOCKED(fn)                                                 \
SHOW(fn)                                                                \
{                                                                       \
        ssize_t ret;                                                    \
        mutex_lock(&bch_register_lock);                                 \
        ret = __ ## fn ## _show(kobj, attr, buf);                       \
        mutex_unlock(&bch_register_lock);                               \
        return ret;                                                     \
}


#define STORE_LOCKED(fn)						\
STORE(fn)                                                               \
{                                                                       \
        ssize_t ret;                                                    \
        mutex_lock(&bch_register_lock);                                 \
        ret = __ ## fn ## _store(kobj, attr, buf, size);                \
        mutex_unlock(&bch_register_lock);                               \
        return ret;                                                     \
}


#define __sysfs_attribute(_name, _mode)					\
	static struct attribute sysfs_##_name =                         \
                { .name = #_name, .mode = _mode }


#define write_attribute(n)	__sysfs_attribute(n, S_IWUSR)

#define read_attribute(n)	__sysfs_attribute(n, S_IRUGO)

#define rw_attribute(n)		__sysfs_attribute(n, S_IRUGO|S_IWUSR)


#define sysfs_printf(file, fmt, ...)					\
do {                                                                    \
        if (attr == &sysfs_ ## file)                                    \
                return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \
} while (0)


#define sysfs_print(file, var)						\
do {                                                                    \
        if (attr == &sysfs_ ## file)                                    \
                return snprint(buf, PAGE_SIZE, var);                    \
} while (0)


#define sysfs_hprint(file, val)						\
do {                                                                    \
        if (attr == &sysfs_ ## file) {                                  \
                ssize_t ret = bch_hprint(buf, val);                     \
                strcat(buf, "\n");                                      \
                return ret + 1;                                         \
        }                                                               \
} while (0)


#define var_printf(_var, fmt)	sysfs_printf(_var, fmt, var(_var))

#define var_print(_var)		sysfs_print(_var, var(_var))

#define var_hprint(_var)	sysfs_hprint(_var, var(_var))


#define sysfs_strtoul(file, var)					\
do {                                                                    \
        if (attr == &sysfs_ ## file)                                    \
                return strtoul_safe(buf, var) ?: (ssize_t) size;        \
} while (0)


#define sysfs_strtoul_clamp(file, var, min, max)			\
do {                                                                    \
        if (attr == &sysfs_ ## file)                                    \
                return strtoul_safe_clamp(buf, var, min, max)           \
                        ?: (ssize_t) size;                              \
} while (0)


#define strtoul_or_return(cp)						\
({                                                                      \
        unsigned long _v;                                               \
        int _r = kstrtoul(cp, 10, &_v);                                 \
        if (_r)                                                         \
                return _r;                                              \
        _v;                                                             \
})


#define strtoi_h_or_return(cp, v)					\
do {                                                                    \
        int _r = strtoi_h(cp, &v);                                      \
        if (_r)                                                         \
                return _r;                                              \
} while (0)


#define sysfs_hatoi(file, var)						\
do {                                                                    \
        if (attr == &sysfs_ ## file)                                    \
                return strtoi_h(buf, &var) ?: (ssize_t) size;           \
} while (0)

#endif  /* _BCACHE_SYSFS_H_ */
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Directory: drivers/md/bcache

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