GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / btrfs / sysfs.h
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 *
63 to_btrfs_feature_attr(struct kobj_attribute *a)
64 {
65         return container_of(a, struct btrfs_feature_attr, kobj_attr);
66 }
67
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 *
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