1#ifndef _BTRFS_SYSFS_H_
2#define _BTRFS_SYSFS_H_
3
4/*
5 * Data exported through sysfs
6 */
7extern u64 btrfs_debugfs_test;
8
9enum btrfs_feature_set {
10	FEAT_COMPAT,
11	FEAT_COMPAT_RO,
12	FEAT_INCOMPAT,
13	FEAT_MAX
14};
15
16#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)			\
17{									\
18	.attr	= { .name = __stringify(_name), .mode = _mode },	\
19	.show	= _show,						\
20	.store	= _store,						\
21}
22
23#define BTRFS_ATTR_RW(_name, _show, _store)			\
24	static struct kobj_attribute btrfs_attr_##_name =		\
25			__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
26
27#define BTRFS_ATTR(_name, _show)					\
28	static struct kobj_attribute btrfs_attr_##_name =		\
29			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
30
31#define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
32
33#define BTRFS_RAID_ATTR(_name, _show)					\
34	static struct kobj_attribute btrfs_raid_attr_##_name =		\
35			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
36
37#define BTRFS_RAID_ATTR_PTR(_name)    (&btrfs_raid_attr_##_name.attr)
38
39
40struct btrfs_feature_attr {
41	struct kobj_attribute kobj_attr;
42	enum btrfs_feature_set feature_set;
43	u64 feature_bit;
44};
45
46#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit)	     \
47static struct btrfs_feature_attr btrfs_attr_##_name = {			     \
48	.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,			     \
49				      btrfs_feature_attr_show,		     \
50				      btrfs_feature_attr_store),	     \
51	.feature_set	= _feature_set,					     \
52	.feature_bit	= _prefix ##_## _feature_bit,			     \
53}
54#define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)
55
56#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
57	BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
58#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
59	BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
60#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
61	BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
62
63/* convert from attribute */
64static inline struct btrfs_feature_attr *
65to_btrfs_feature_attr(struct kobj_attribute *a)
66{
67	return container_of(a, struct btrfs_feature_attr, kobj_attr);
68}
69
70static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
71{
72	return container_of(attr, struct kobj_attribute, attr);
73}
74
75static inline struct btrfs_feature_attr *
76attr_to_btrfs_feature_attr(struct attribute *attr)
77{
78	return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
79}
80
81char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
82extern const char * const btrfs_feature_set_names[3];
83extern struct kobj_type space_info_ktype;
84extern struct kobj_type btrfs_raid_ktype;
85int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
86		struct btrfs_device *one_device);
87int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
88                struct btrfs_device *one_device);
89#endif /* _BTRFS_SYSFS_H_ */
90