1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _BCACHE_SYSFS_H_
  3#define _BCACHE_SYSFS_H_
  4
  5#define KTYPE(type)							\
  6struct kobj_type type ## _ktype = {					\
  7	.release	= type ## _release,				\
  8	.sysfs_ops	= &((const struct sysfs_ops) {			\
  9		.show	= type ## _show,				\
 10		.store	= type ## _store				\
 11	}),								\
 12	.default_attrs	= type ## _files				\
 13}
 14
 15#define SHOW(fn)							\
 16static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
 17			   char *buf)					\
 18
 19#define STORE(fn)							\
 20static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
 21			    const char *buf, size_t size)		\
 22
 23#define SHOW_LOCKED(fn)							\
 24SHOW(fn)								\
 25{									\
 26	ssize_t ret;							\
 27	mutex_lock(&bch_register_lock);					\
 28	ret = __ ## fn ## _show(kobj, attr, buf);			\
 29	mutex_unlock(&bch_register_lock);				\
 30	return ret;							\
 31}
 32
 33#define STORE_LOCKED(fn)						\
 34STORE(fn)								\
 35{									\
 36	ssize_t ret;							\
 37	mutex_lock(&bch_register_lock);					\
 38	ret = __ ## fn ## _store(kobj, attr, buf, size);		\
 39	mutex_unlock(&bch_register_lock);				\
 40	return ret;							\
 41}
 42
 43#define __sysfs_attribute(_name, _mode)					\
 44	static struct attribute sysfs_##_name =				\
 45		{ .name = #_name, .mode = _mode }
 46
 47#define write_attribute(n)	__sysfs_attribute(n, S_IWUSR)
 48#define read_attribute(n)	__sysfs_attribute(n, S_IRUGO)
 49#define rw_attribute(n)		__sysfs_attribute(n, S_IRUGO|S_IWUSR)
 50
 51#define sysfs_printf(file, fmt, ...)					\
 52do {									\
 53	if (attr == &sysfs_ ## file)					\
 54		return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__);	\
 55} while (0)
 56
 57#define sysfs_print(file, var)						\
 58do {									\
 59	if (attr == &sysfs_ ## file)					\
 60		return snprint(buf, PAGE_SIZE, var);			\
 61} while (0)
 62
 63#define sysfs_hprint(file, val)						\
 64do {									\
 65	if (attr == &sysfs_ ## file) {					\
 66		ssize_t ret = bch_hprint(buf, val);			\
 67		strcat(buf, "\n");					\
 68		return ret + 1;						\
 69	}								\
 70} while (0)
 71
 72#define var_printf(_var, fmt)	sysfs_printf(_var, fmt, var(_var))
 73#define var_print(_var)		sysfs_print(_var, var(_var))
 74#define var_hprint(_var)	sysfs_hprint(_var, var(_var))
 75
 76#define sysfs_strtoul(file, var)					\
 77do {									\
 78	if (attr == &sysfs_ ## file)					\
 79		return strtoul_safe(buf, var) ?: (ssize_t) size;	\
 80} while (0)
 81
 82#define sysfs_strtoul_clamp(file, var, min, max)			\
 83do {									\
 84	if (attr == &sysfs_ ## file)					\
 85		return strtoul_safe_clamp(buf, var, min, max)		\
 86			?: (ssize_t) size;				\
 87} while (0)
 88
 89#define strtoul_or_return(cp)						\
 90({									\
 91	unsigned long _v;						\
 92	int _r = kstrtoul(cp, 10, &_v);					\
 93	if (_r)								\
 94		return _r;						\
 95	_v;								\
 96})
 97
 98#define strtoi_h_or_return(cp, v)					\
 99do {									\
100	int _r = strtoi_h(cp, &v);					\
101	if (_r)								\
102		return _r;						\
103} while (0)
104
105#define sysfs_hatoi(file, var)						\
106do {									\
107	if (attr == &sysfs_ ## file)					\
108		return strtoi_h(buf, &var) ?: (ssize_t) size;		\
109} while (0)
110
111#endif  /* _BCACHE_SYSFS_H_ */