1 /* type-specific structures for sysfs_dirent->s_* union members */
2 struct sysfs_elem_dir {
6 struct sysfs_elem_symlink {
7 struct sysfs_dirent *target_sd;
10 struct sysfs_elem_attr {
11 struct attribute *attr;
14 struct sysfs_elem_bin_attr {
15 struct bin_attribute *bin_attr;
19 * sysfs_dirent - the building block of sysfs hierarchy. Each and
20 * every sysfs node is represented by single sysfs_dirent.
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.
29 struct sysfs_dirent *s_parent;
30 struct sysfs_dirent *s_sibling;
31 struct sysfs_dirent *s_children;
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;
44 struct iattr *s_iattr;
48 #define SD_DEACTIVATED_BIAS INT_MIN
50 #define SYSFS_TYPE_MASK 0x00ff
51 #define SYSFS_DIR 0x0001
52 #define SYSFS_KOBJ_ATTR 0x0002
53 #define SYSFS_KOBJ_BIN_ATTR 0x0004
54 #define SYSFS_KOBJ_LINK 0x0008
55 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
57 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
58 #define SYSFS_FLAG_REMOVED 0x0200
60 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
62 return sd->s_flags & SYSFS_TYPE_MASK;
66 * Context structure to be used while adding/removing nodes.
68 struct sysfs_addrm_cxt {
69 struct sysfs_dirent *parent_sd;
70 struct inode *parent_inode;
71 struct sysfs_dirent *removed;
78 extern struct sysfs_dirent sysfs_root;
79 extern struct super_block *sysfs_sb;
80 extern struct kmem_cache *sysfs_dir_cachep;
85 extern struct mutex sysfs_mutex;
86 extern struct mutex sysfs_rename_mutex;
87 extern spinlock_t sysfs_assoc_lock;
89 extern const struct file_operations sysfs_dir_operations;
90 extern const struct inode_operations sysfs_dir_inode_operations;
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);
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);
109 void release_sysfs_dirent(struct sysfs_dirent *sd);
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);
115 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
118 WARN_ON(!atomic_read(&sd->s_count));
119 atomic_inc(&sd->s_count);
124 static inline void sysfs_put(struct sysfs_dirent *sd)
126 if (sd && atomic_dec_and_test(&sd->s_count))
127 release_sysfs_dirent(sd);
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);
140 extern const struct file_operations sysfs_file_operations;
142 int sysfs_add_file(struct sysfs_dirent *dir_sd,
143 const struct attribute *attr, int type);
148 extern const struct file_operations bin_fops;
153 extern const struct inode_operations sysfs_symlink_inode_operations;