xref: /openbmc/linux/fs/btrfs/sysfs.h (revision 6f52b16c5b29b89d92c0e7236f4655dc8491ad70)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BTRFS_SYSFS_H_
3 #define _BTRFS_SYSFS_H_
4 
5 /*
6  * Data exported through sysfs
7  */
8 extern u64 btrfs_debugfs_test;
9 
10 enum btrfs_feature_set {
11 	FEAT_COMPAT,
12 	FEAT_COMPAT_RO,
13 	FEAT_INCOMPAT,
14 	FEAT_MAX
15 };
16 
17 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)			\
18 {									\
19 	.attr	= { .name = __stringify(_name), .mode = _mode },	\
20 	.show	= _show,						\
21 	.store	= _store,						\
22 }
23 
24 #define BTRFS_ATTR_RW(_name, _show, _store)			\
25 	static struct kobj_attribute btrfs_attr_##_name =		\
26 			__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
27 
28 #define BTRFS_ATTR(_name, _show)					\
29 	static struct kobj_attribute btrfs_attr_##_name =		\
30 			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
31 
32 #define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
33 
34 #define BTRFS_RAID_ATTR(_name, _show)					\
35 	static struct kobj_attribute btrfs_raid_attr_##_name =		\
36 			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
37 
38 #define BTRFS_RAID_ATTR_PTR(_name)    (&btrfs_raid_attr_##_name.attr)
39 
40 
41 struct btrfs_feature_attr {
42 	struct kobj_attribute kobj_attr;
43 	enum btrfs_feature_set feature_set;
44 	u64 feature_bit;
45 };
46 
47 #define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit)	     \
48 static struct btrfs_feature_attr btrfs_attr_##_name = {			     \
49 	.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,			     \
50 				      btrfs_feature_attr_show,		     \
51 				      btrfs_feature_attr_store),	     \
52 	.feature_set	= _feature_set,					     \
53 	.feature_bit	= _prefix ##_## _feature_bit,			     \
54 }
55 #define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)
56 
57 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
58 	BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
59 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
60 	BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
61 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
62 	BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
63 
64 /* convert from attribute */
65 static inline struct btrfs_feature_attr *
66 to_btrfs_feature_attr(struct kobj_attribute *a)
67 {
68 	return container_of(a, struct btrfs_feature_attr, kobj_attr);
69 }
70 
71 static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
72 {
73 	return container_of(attr, struct kobj_attribute, attr);
74 }
75 
76 static inline struct btrfs_feature_attr *
77 attr_to_btrfs_feature_attr(struct attribute *attr)
78 {
79 	return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
80 }
81 
82 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
83 extern const char * const btrfs_feature_set_names[3];
84 extern struct kobj_type space_info_ktype;
85 extern struct kobj_type btrfs_raid_ktype;
86 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
87 		struct btrfs_device *one_device);
88 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
89                 struct btrfs_device *one_device);
90 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
91 				struct kobject *parent);
92 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
93 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
94 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
95 		u64 bit, enum btrfs_feature_set set);
96 
97 #endif /* _BTRFS_SYSFS_H_ */
98