Commit | Line | Data |
---|---|---|
59f69015 | 1 | /* type-specific structures for sysfs_dirent->s_* union members */ |
3e519038 | 2 | struct sysfs_elem_dir { |
59f69015 | 3 | struct kobject *kobj; |
3e519038 TH |
4 | }; |
5 | ||
6 | struct sysfs_elem_symlink { | |
59f69015 | 7 | struct sysfs_dirent *target_sd; |
3e519038 TH |
8 | }; |
9 | ||
10 | struct sysfs_elem_attr { | |
59f69015 | 11 | struct attribute *attr; |
3e519038 TH |
12 | }; |
13 | ||
14 | struct sysfs_elem_bin_attr { | |
59f69015 | 15 | struct bin_attribute *bin_attr; |
3e519038 TH |
16 | }; |
17 | ||
0ab66088 | 18 | /* |
59f69015 TH |
19 | * sysfs_dirent - the building block of sysfs hierarchy. Each and |
20 | * every sysfs node is represented by single sysfs_dirent. | |
21 | * | |
0ab66088 TH |
22 | * As long as s_count reference is held, the sysfs_dirent itself is |
23 | * accessible. Dereferencing s_elem or any other outer entity | |
24 | * requires s_active reference. | |
25 | */ | |
d56c3eae AR |
26 | struct sysfs_dirent { |
27 | atomic_t s_count; | |
8619f979 | 28 | atomic_t s_active; |
59f69015 TH |
29 | struct sysfs_dirent *s_parent; |
30 | struct sysfs_dirent *s_sibling; | |
31 | struct sysfs_dirent *s_children; | |
32 | const char *s_name; | |
3e519038 TH |
33 | |
34 | union { | |
b1fc3d61 TH |
35 | struct sysfs_elem_dir s_dir; |
36 | struct sysfs_elem_symlink s_symlink; | |
37 | struct sysfs_elem_attr s_attr; | |
38 | struct sysfs_elem_bin_attr s_bin_attr; | |
39 | }; | |
3e519038 | 40 | |
b402d72c | 41 | unsigned int s_flags; |
dc351252 | 42 | ino_t s_ino; |
b13dc89c | 43 | umode_t s_mode; |
59f69015 | 44 | struct iattr *s_iattr; |
d56c3eae AR |
45 | atomic_t s_event; |
46 | }; | |
1da177e4 | 47 | |
59f69015 | 48 | #define SD_DEACTIVATED_BIAS INT_MIN |
0ab66088 | 49 | |
59f69015 | 50 | #define SYSFS_TYPE_MASK 0x00ff |
dc2f75f0 TH |
51 | #define SYSFS_DIR 0x0001 |
52 | #define SYSFS_KOBJ_ATTR 0x0002 | |
53 | #define SYSFS_KOBJ_BIN_ATTR 0x0004 | |
54 | #define SYSFS_KOBJ_LINK 0x0008 | |
59f69015 TH |
55 | #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
56 | ||
57 | #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK | |
58 | #define SYSFS_FLAG_REMOVED 0x0200 | |
59 | ||
60 | static inline unsigned int sysfs_type(struct sysfs_dirent *sd) | |
61 | { | |
62 | return sd->s_flags & SYSFS_TYPE_MASK; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Context structure to be used while adding/removing nodes. | |
67 | */ | |
fb6896da TH |
68 | struct sysfs_addrm_cxt { |
69 | struct sysfs_dirent *parent_sd; | |
70 | struct inode *parent_inode; | |
71 | struct sysfs_dirent *removed; | |
72 | int cnt; | |
73 | }; | |
74 | ||
59f69015 TH |
75 | /* |
76 | * mount.c | |
77 | */ | |
51225039 | 78 | extern struct sysfs_dirent sysfs_root; |
59f69015 | 79 | extern struct super_block *sysfs_sb; |
e18b890b | 80 | extern struct kmem_cache *sysfs_dir_cachep; |
1da177e4 | 81 | |
59f69015 TH |
82 | /* |
83 | * dir.c | |
84 | */ | |
3007e997 | 85 | extern struct mutex sysfs_mutex; |
932ea2e3 | 86 | extern struct mutex sysfs_rename_mutex; |
59f69015 TH |
87 | extern spinlock_t sysfs_assoc_lock; |
88 | ||
4b6f5d20 | 89 | extern const struct file_operations sysfs_dir_operations; |
c5ef1c42 | 90 | extern const struct inode_operations sysfs_dir_inode_operations; |
1da177e4 | 91 | |
59f69015 TH |
92 | struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); |
93 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); | |
94 | void sysfs_put_active(struct sysfs_dirent *sd); | |
95 | struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); | |
96 | void sysfs_put_active_two(struct sysfs_dirent *sd); | |
97 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, | |
98 | struct sysfs_dirent *parent_sd); | |
99 | int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); | |
100 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); | |
101 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); | |
102 | ||
103 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, | |
104 | const unsigned char *name); | |
105 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, | |
106 | const unsigned char *name); | |
107 | struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); | |
108 | ||
109 | void release_sysfs_dirent(struct sysfs_dirent *sd); | |
110 | ||
111 | int sysfs_create_subdir(struct kobject *kobj, const char *name, | |
112 | struct sysfs_dirent **p_sd); | |
113 | void sysfs_remove_subdir(struct sysfs_dirent *sd); | |
114 | ||
115 | static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd) | |
1da177e4 | 116 | { |
0ab66088 TH |
117 | if (sd) { |
118 | WARN_ON(!atomic_read(&sd->s_count)); | |
119 | atomic_inc(&sd->s_count); | |
120 | } | |
121 | return sd; | |
1da177e4 LT |
122 | } |
123 | ||
59f69015 | 124 | static inline void sysfs_put(struct sysfs_dirent *sd) |
1da177e4 | 125 | { |
0ab66088 TH |
126 | if (sd && atomic_dec_and_test(&sd->s_count)) |
127 | release_sysfs_dirent(sd); | |
128 | } | |
59f69015 TH |
129 | |
130 | /* | |
131 | * inode.c | |
132 | */ | |
133 | struct inode *sysfs_get_inode(struct sysfs_dirent *sd); | |
134 | int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); | |
135 | int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); | |
136 | ||
137 | /* | |
138 | * file.c | |
139 | */ | |
140 | extern const struct file_operations sysfs_file_operations; | |
141 | ||
142 | int sysfs_add_file(struct sysfs_dirent *dir_sd, | |
143 | const struct attribute *attr, int type); | |
144 | ||
145 | /* | |
146 | * bin.c | |
147 | */ | |
148 | extern const struct file_operations bin_fops; | |
149 | ||
150 | /* | |
151 | * symlink.c | |
152 | */ | |
153 | extern const struct inode_operations sysfs_symlink_inode_operations; |