1 struct sysfs_open_dirent;
3 /* type-specific structures for sysfs_dirent->s_* union members */
4 struct sysfs_elem_dir {
6 /* children list starts here and goes through sd->s_sibling */
7 struct sysfs_dirent *children;
10 struct sysfs_elem_symlink {
11 struct sysfs_dirent *target_sd;
14 struct sysfs_elem_attr {
15 struct attribute *attr;
16 struct sysfs_open_dirent *open;
19 struct sysfs_elem_bin_attr {
20 struct bin_attribute *bin_attr;
24 * sysfs_dirent - the building block of sysfs hierarchy. Each and
25 * every sysfs node is represented by single sysfs_dirent.
27 * As long as s_count reference is held, the sysfs_dirent itself is
28 * accessible. Dereferencing s_elem or any other outer entity
29 * requires s_active reference.
34 struct sysfs_dirent *s_parent;
35 struct sysfs_dirent *s_sibling;
39 struct sysfs_elem_dir s_dir;
40 struct sysfs_elem_symlink s_symlink;
41 struct sysfs_elem_attr s_attr;
42 struct sysfs_elem_bin_attr s_bin_attr;
48 struct iattr *s_iattr;
52 #define SD_DEACTIVATED_BIAS INT_MIN
54 #define SYSFS_TYPE_MASK 0x00ff
55 #define SYSFS_DIR 0x0001
56 #define SYSFS_KOBJ_ATTR 0x0002
57 #define SYSFS_KOBJ_BIN_ATTR 0x0004
58 #define SYSFS_KOBJ_LINK 0x0008
59 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
61 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
62 #define SYSFS_FLAG_REMOVED 0x0200
64 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
66 return sd->s_flags & SYSFS_TYPE_MASK;
70 * Context structure to be used while adding/removing nodes.
72 struct sysfs_addrm_cxt {
73 struct sysfs_dirent *parent_sd;
74 struct inode *parent_inode;
75 struct sysfs_dirent *removed;
82 extern struct sysfs_dirent sysfs_root;
83 extern struct super_block *sysfs_sb;
84 extern struct kmem_cache *sysfs_dir_cachep;
89 extern struct mutex sysfs_mutex;
90 extern struct mutex sysfs_rename_mutex;
91 extern spinlock_t sysfs_assoc_lock;
93 extern const struct file_operations sysfs_dir_operations;
94 extern const struct inode_operations sysfs_dir_inode_operations;
96 struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
97 struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
98 void sysfs_put_active(struct sysfs_dirent *sd);
99 struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
100 void sysfs_put_active_two(struct sysfs_dirent *sd);
101 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
102 struct sysfs_dirent *parent_sd);
103 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
104 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
105 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
107 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
108 const unsigned char *name);
109 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
110 const unsigned char *name);
111 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
113 void release_sysfs_dirent(struct sysfs_dirent *sd);
115 int sysfs_create_subdir(struct kobject *kobj, const char *name,
116 struct sysfs_dirent **p_sd);
117 void sysfs_remove_subdir(struct sysfs_dirent *sd);
119 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
122 WARN_ON(!atomic_read(&sd->s_count));
123 atomic_inc(&sd->s_count);
128 static inline void sysfs_put(struct sysfs_dirent *sd)
130 if (sd && atomic_dec_and_test(&sd->s_count))
131 release_sysfs_dirent(sd);
137 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
138 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
139 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
144 extern const struct file_operations sysfs_file_operations;
146 int sysfs_add_file(struct sysfs_dirent *dir_sd,
147 const struct attribute *attr, int type);
152 extern const struct file_operations bin_fops;
157 extern const struct inode_operations sysfs_symlink_inode_operations;