[mirror_ubuntu-bionic-kernel.git] / fs / btrfs / sysfs.h

#ifndef _BTRFS_SYSFS_H_
#define _BTRFS_SYSFS_H_

enum btrfs_feature_set {
	FEAT_COMPAT,
	FEAT_COMPAT_RO,
	FEAT_INCOMPAT,
	FEAT_MAX
};

#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)			\
{									\
	.attr	= { .name = __stringify(_name), .mode = _mode },	\
	.show	= _show,						\
	.store	= _store,						\
}

#define BTRFS_ATTR_RW(_name, _mode, _show, _store)			\
static struct kobj_attribute btrfs_attr_##_name =			\
			__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
#define BTRFS_ATTR(_name, _mode, _show)					\
	BTRFS_ATTR_RW(_name, _mode, _show, NULL)
#define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)

struct btrfs_feature_attr {
	struct kobj_attribute kobj_attr;
	enum btrfs_feature_set feature_set;
	u64 feature_bit;
};

#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit)	     \
static struct btrfs_feature_attr btrfs_attr_##_name = {			     \
	.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,			     \
				      btrfs_feature_attr_show, NULL),	     \
	.feature_set	= _feature_set,					     \
	.feature_bit	= _prefix ##_## _feature_bit,			     \
}
#define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)

#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
	BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
	BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
	BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)

/* convert from attribute */
#define to_btrfs_feature_attr(a) \
			container_of(a, struct btrfs_feature_attr, kobj_attr)
#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
#define attr_to_btrfs_feature_attr(a) \
			to_btrfs_feature_attr(attr_to_btrfs_attr(a))
#endif /* _BTRFS_SYSFS_H_ */
Commit	Line	Data
079b72bc JM	1	#ifndef _BTRFS_SYSFS_H_
	2	#define _BTRFS_SYSFS_H_
	3
	4	enum btrfs_feature_set {
	5	FEAT_COMPAT,
	6	FEAT_COMPAT_RO,
	7	FEAT_INCOMPAT,
	8	FEAT_MAX
	9	};
	10
	11	#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
	12	{ \
	13	.attr = { .name = __stringify(_name), .mode = _mode }, \
	14	.show = _show, \
	15	.store = _store, \
	16	}
	17
5ac1d209 JM	18	#define BTRFS_ATTR_RW(_name, _mode, _show, _store) \
	19	static struct kobj_attribute btrfs_attr_##_name = \
	20	__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
	21	#define BTRFS_ATTR(_name, _mode, _show) \
	22	BTRFS_ATTR_RW(_name, _mode, _show, NULL)
	23	#define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr)
	24
079b72bc JM	25	struct btrfs_feature_attr {
	26	struct kobj_attribute kobj_attr;
	27	enum btrfs_feature_set feature_set;
	28	u64 feature_bit;
	29	};
	30
	31	#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \
	32	static struct btrfs_feature_attr btrfs_attr_##_name = { \
	33	.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
	34	btrfs_feature_attr_show, NULL), \
	35	.feature_set = _feature_set, \
	36	.feature_bit = _prefix ##_## _feature_bit, \
	37	}
	38	#define BTRFS_FEAT_ATTR_PTR(_name) (&btrfs_attr_##_name.kobj_attr.attr)
	39
	40	#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
	41	BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
	42	#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
	43	BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
	44	#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
	45	BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
	46
	47	/* convert from attribute */
	48	#define to_btrfs_feature_attr(a) \
	49	container_of(a, struct btrfs_feature_attr, kobj_attr)
5ac1d209 JM	50	#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
	51	#define attr_to_btrfs_feature_attr(a) \
	52	to_btrfs_feature_attr(attr_to_btrfs_attr(a))
079b72bc	53	#endif /* _BTRFS_SYSFS_H_ */