1 /* type-specific structures for sysfs_dirent->s_* union members */
2 struct sysfs_elem_dir {
4 /* children list starts here and goes through sd->s_sibling */
5 struct sysfs_dirent *children;
8 struct sysfs_elem_symlink {
9 struct sysfs_dirent *target_sd;
12 struct sysfs_elem_attr {
13 struct attribute *attr;
16 struct sysfs_elem_bin_attr {
17 struct bin_attribute *bin_attr;
21 * sysfs_dirent - the building block of sysfs hierarchy. Each and
22 * every sysfs node is represented by single sysfs_dirent.
24 * As long as s_count reference is held, the sysfs_dirent itself is
25 * accessible. Dereferencing s_elem or any other outer entity
26 * requires s_active reference.
31 struct sysfs_dirent *s_parent;
32 struct sysfs_dirent *s_sibling;
36 struct sysfs_elem_dir s_dir;
37 struct sysfs_elem_symlink s_symlink;
38 struct sysfs_elem_attr s_attr;
39 struct sysfs_elem_bin_attr s_bin_attr;
45 struct iattr *s_iattr;
49 #define SD_DEACTIVATED_BIAS INT_MIN
51 #define SYSFS_TYPE_MASK 0x00ff
52 #define SYSFS_DIR 0x0001
53 #define SYSFS_KOBJ_ATTR 0x0002
54 #define SYSFS_KOBJ_BIN_ATTR 0x0004
55 #define SYSFS_KOBJ_LINK 0x0008
56 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
58 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
59 #define SYSFS_FLAG_REMOVED 0x0200
61 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
63 return sd->s_flags & SYSFS_TYPE_MASK;
67 * Context structure to be used while adding/removing nodes.
69 struct sysfs_addrm_cxt {
70 struct sysfs_dirent *parent_sd;
71 struct inode *parent_inode;
72 struct sysfs_dirent *removed;
79 extern struct sysfs_dirent sysfs_root;
80 extern struct super_block *sysfs_sb;
81 extern struct kmem_cache *sysfs_dir_cachep;
86 extern struct mutex sysfs_mutex;
87 extern struct mutex sysfs_rename_mutex;
88 extern spinlock_t sysfs_assoc_lock;
90 extern const struct file_operations sysfs_dir_operations;
91 extern const struct inode_operations sysfs_dir_inode_operations;
93 struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
94 struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
95 void sysfs_put_active(struct sysfs_dirent *sd);
96 struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
97 void sysfs_put_active_two(struct sysfs_dirent *sd);
98 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
99 struct sysfs_dirent *parent_sd);
100 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
101 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
102 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
104 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
105 const unsigned char *name);
106 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
107 const unsigned char *name);
108 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
110 void release_sysfs_dirent(struct sysfs_dirent *sd);
112 int sysfs_create_subdir(struct kobject *kobj, const char *name,
113 struct sysfs_dirent **p_sd);
114 void sysfs_remove_subdir(struct sysfs_dirent *sd);
116 static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
119 WARN_ON(!atomic_read(&sd->s_count));
120 atomic_inc(&sd->s_count);
125 static inline void sysfs_put(struct sysfs_dirent *sd)
127 if (sd && atomic_dec_and_test(&sd->s_count))
128 release_sysfs_dirent(sd);
134 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
135 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
136 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
141 extern const struct file_operations sysfs_file_operations;
143 int sysfs_add_file(struct sysfs_dirent *dir_sd,
144 const struct attribute *attr, int type);
149 extern const struct file_operations bin_fops;
154 extern const struct inode_operations sysfs_symlink_inode_operations;