1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef BTRFS_SYSFS_H
4 #define BTRFS_SYSFS_H
5 
6 /*
7  * Data exported through sysfs
8  */
9 extern u64 btrfs_debugfs_test;
10 
11 enum btrfs_feature_set {
12 	FEAT_COMPAT = 0,
13 	FEAT_COMPAT_RO,
14 	FEAT_INCOMPAT,
15 	FEAT_MAX
16 };
17 
18 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)			\
19 {									\
20 	.attr	= { .name = __stringify(_name), .mode = _mode },	\
21 	.show	= _show,						\
22 	.store	= _store,						\
23 }
24 
25 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store)			\
26 	static struct kobj_attribute btrfs_attr_##_prefix##_##_name =	\
27 			__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
28 
29 #define BTRFS_ATTR(_prefix, _name, _show)				\
30 	static struct kobj_attribute btrfs_attr_##_prefix##_##_name =	\
31 			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
32 
33 #define BTRFS_ATTR_PTR(_prefix, _name)					\
34 	(&btrfs_attr_##_prefix##_##_name.attr)
35 
36 
37 struct btrfs_feature_attr {
38 	struct kobj_attribute kobj_attr;
39 	enum btrfs_feature_set feature_set;
40 	u64 feature_bit;
41 };
42 
43 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit)  \
44 static struct btrfs_feature_attr btrfs_attr_features_##_name = {	     \
45 	.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,			     \
46 				      btrfs_feature_attr_show,		     \
47 				      btrfs_feature_attr_store),	     \
48 	.feature_set	= _feature_set,					     \
49 	.feature_bit	= _feature_prefix ##_## _feature_bit,		     \
50 }
51 #define BTRFS_FEAT_ATTR_PTR(_name)					     \
52 	(&btrfs_attr_features_##_name.kobj_attr.attr)
53 
54 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
55 	BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
56 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
57 	BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
58 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
59 	BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
60 
61 /* convert from attribute */
62 static inline struct btrfs_feature_attr *
to_btrfs_feature_attr(struct kobj_attribute * a)63 to_btrfs_feature_attr(struct kobj_attribute *a)
64 {
65 	return container_of(a, struct btrfs_feature_attr, kobj_attr);
66 }
67 
attr_to_btrfs_attr(struct attribute * attr)68 static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
69 {
70 	return container_of(attr, struct kobj_attribute, attr);
71 }
72 
73 static inline struct btrfs_feature_attr *
attr_to_btrfs_feature_attr(struct attribute * attr)74 attr_to_btrfs_feature_attr(struct attribute *attr)
75 {
76 	return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
77 }
78 
79 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
80 extern const char * const btrfs_feature_set_names[FEAT_MAX];
81 extern struct kobj_type space_info_ktype;
82 extern struct kobj_type btrfs_raid_ktype;
83 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
84 		struct btrfs_device *one_device);
85 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
86                 struct btrfs_device *one_device);
87 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
88 				struct kobject *parent);
89 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
90 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
91 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
92 		u64 bit, enum btrfs_feature_set set);
93 
94 #endif
95