2 * sysfs.h - definitions for the device driver filesystem
4 * Copyright (c) 2001,2002 Patrick Mochel
5 * Copyright (c) 2004 Silicon Graphics, Inc.
6 * Copyright (c) 2007 SUSE Linux Products GmbH
7 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
9 * Please see Documentation/filesystems/sysfs.txt for more information.
15 #include <linux/kernfs.h>
16 #include <linux/compiler.h>
17 #include <linux/errno.h>
18 #include <linux/list.h>
19 #include <linux/lockdep.h>
20 #include <linux/kobject_ns.h>
21 #include <linux/stat.h>
22 #include <linux/atomic.h>
32 #ifdef CONFIG_DEBUG_LOCK_ALLOC
33 bool ignore_lockdep:1;
34 struct lock_class_key *key;
35 struct lock_class_key skey;
40 * sysfs_attr_init - initialize a dynamically allocated sysfs attribute
41 * @attr: struct attribute to initialize
43 * Initialize a dynamically allocated struct attribute so we can
44 * make lockdep happy. This is a new requirement for attributes
45 * and initially this is only needed when lockdep is enabled.
46 * Lockdep gives a nice error when your attribute is added to
47 * sysfs if you don't have this.
49 #ifdef CONFIG_DEBUG_LOCK_ALLOC
50 #define sysfs_attr_init(attr) \
52 static struct lock_class_key __key; \
54 (attr)->key = &__key; \
57 #define sysfs_attr_init(attr) do {} while (0)
60 struct attribute_group {
62 umode_t (*is_visible)(struct kobject *,
63 struct attribute *, int);
64 struct attribute **attrs;
65 struct bin_attribute **bin_attrs;
69 * Use these macros to make defining attributes easier. See include/linux/device.h
73 #define __ATTR(_name, _mode, _show, _store) { \
74 .attr = {.name = __stringify(_name), .mode = _mode }, \
79 #define __ATTR_RO(_name) { \
80 .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \
81 .show = _name##_show, \
84 #define __ATTR_WO(_name) { \
85 .attr = { .name = __stringify(_name), .mode = S_IWUSR }, \
86 .store = _name##_store, \
89 #define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \
90 _name##_show, _name##_store)
92 #define __ATTR_NULL { .attr = { .name = NULL } }
94 #ifdef CONFIG_DEBUG_LOCK_ALLOC
95 #define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \
96 .attr = {.name = __stringify(_name), .mode = _mode, \
97 .ignore_lockdep = true }, \
102 #define __ATTR_IGNORE_LOCKDEP __ATTR
105 #define __ATTRIBUTE_GROUPS(_name) \
106 static const struct attribute_group *_name##_groups[] = { \
111 #define ATTRIBUTE_GROUPS(_name) \
112 static const struct attribute_group _name##_group = { \
113 .attrs = _name##_attrs, \
115 __ATTRIBUTE_GROUPS(_name)
118 struct vm_area_struct;
120 struct bin_attribute {
121 struct attribute attr;
124 ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
125 char *, loff_t, size_t);
126 ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
127 char *, loff_t, size_t);
128 int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
129 struct vm_area_struct *vma);
133 * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
134 * @attr: struct bin_attribute to initialize
136 * Initialize a dynamically allocated struct bin_attribute so we
137 * can make lockdep happy. This is a new requirement for
138 * attributes and initially this is only needed when lockdep is
139 * enabled. Lockdep gives a nice error when your attribute is
140 * added to sysfs if you don't have this.
142 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
144 /* macros to create static binary attributes easier */
145 #define __BIN_ATTR(_name, _mode, _read, _write, _size) { \
146 .attr = { .name = __stringify(_name), .mode = _mode }, \
152 #define __BIN_ATTR_RO(_name, _size) { \
153 .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \
154 .read = _name##_read, \
158 #define __BIN_ATTR_RW(_name, _size) __BIN_ATTR(_name, \
159 (S_IWUSR | S_IRUGO), _name##_read, \
160 _name##_write, _size)
162 #define __BIN_ATTR_NULL __ATTR_NULL
164 #define BIN_ATTR(_name, _mode, _read, _write, _size) \
165 struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read, \
168 #define BIN_ATTR_RO(_name, _size) \
169 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)
171 #define BIN_ATTR_RW(_name, _size) \
172 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
175 ssize_t (*show)(struct kobject *, struct attribute *, char *);
176 ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
181 int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
182 void sysfs_remove_dir(struct kobject *kobj);
183 int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
185 int __must_check sysfs_move_dir_ns(struct kobject *kobj,
186 struct kobject *new_parent_kobj,
189 int __must_check sysfs_create_file_ns(struct kobject *kobj,
190 const struct attribute *attr,
192 int __must_check sysfs_create_files(struct kobject *kobj,
193 const struct attribute **attr);
194 int __must_check sysfs_chmod_file(struct kobject *kobj,
195 const struct attribute *attr, umode_t mode);
196 void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
198 bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
199 void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
201 int __must_check sysfs_create_bin_file(struct kobject *kobj,
202 const struct bin_attribute *attr);
203 void sysfs_remove_bin_file(struct kobject *kobj,
204 const struct bin_attribute *attr);
206 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
208 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
209 struct kobject *target,
211 void sysfs_remove_link(struct kobject *kobj, const char *name);
213 int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
214 const char *old_name, const char *new_name,
217 void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
220 int __must_check sysfs_create_group(struct kobject *kobj,
221 const struct attribute_group *grp);
222 int __must_check sysfs_create_groups(struct kobject *kobj,
223 const struct attribute_group **groups);
224 int sysfs_update_group(struct kobject *kobj,
225 const struct attribute_group *grp);
226 void sysfs_remove_group(struct kobject *kobj,
227 const struct attribute_group *grp);
228 void sysfs_remove_groups(struct kobject *kobj,
229 const struct attribute_group **groups);
230 int sysfs_add_file_to_group(struct kobject *kobj,
231 const struct attribute *attr, const char *group);
232 void sysfs_remove_file_from_group(struct kobject *kobj,
233 const struct attribute *attr, const char *group);
234 int sysfs_merge_group(struct kobject *kobj,
235 const struct attribute_group *grp);
236 void sysfs_unmerge_group(struct kobject *kobj,
237 const struct attribute_group *grp);
238 int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
239 struct kobject *target, const char *link_name);
240 void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
241 const char *link_name);
243 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
245 int __must_check sysfs_init(void);
247 #else /* CONFIG_SYSFS */
249 static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
254 static inline void sysfs_remove_dir(struct kobject *kobj)
258 static inline int sysfs_rename_dir_ns(struct kobject *kobj,
259 const char *new_name, const void *new_ns)
264 static inline int sysfs_move_dir_ns(struct kobject *kobj,
265 struct kobject *new_parent_kobj,
271 static inline int sysfs_create_file_ns(struct kobject *kobj,
272 const struct attribute *attr,
278 static inline int sysfs_create_files(struct kobject *kobj,
279 const struct attribute **attr)
284 static inline int sysfs_chmod_file(struct kobject *kobj,
285 const struct attribute *attr, umode_t mode)
290 static inline void sysfs_remove_file_ns(struct kobject *kobj,
291 const struct attribute *attr,
296 static inline bool sysfs_remove_file_self(struct kobject *kobj,
297 const struct attribute *attr)
302 static inline void sysfs_remove_files(struct kobject *kobj,
303 const struct attribute **attr)
307 static inline int sysfs_create_bin_file(struct kobject *kobj,
308 const struct bin_attribute *attr)
313 static inline void sysfs_remove_bin_file(struct kobject *kobj,
314 const struct bin_attribute *attr)
318 static inline int sysfs_create_link(struct kobject *kobj,
319 struct kobject *target, const char *name)
324 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
325 struct kobject *target,
331 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
335 static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t,
336 const char *old_name,
337 const char *new_name, const void *ns)
342 static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
347 static inline int sysfs_create_group(struct kobject *kobj,
348 const struct attribute_group *grp)
353 static inline int sysfs_create_groups(struct kobject *kobj,
354 const struct attribute_group **groups)
359 static inline int sysfs_update_group(struct kobject *kobj,
360 const struct attribute_group *grp)
365 static inline void sysfs_remove_group(struct kobject *kobj,
366 const struct attribute_group *grp)
370 static inline void sysfs_remove_groups(struct kobject *kobj,
371 const struct attribute_group **groups)
375 static inline int sysfs_add_file_to_group(struct kobject *kobj,
376 const struct attribute *attr, const char *group)
381 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
382 const struct attribute *attr, const char *group)
386 static inline int sysfs_merge_group(struct kobject *kobj,
387 const struct attribute_group *grp)
392 static inline void sysfs_unmerge_group(struct kobject *kobj,
393 const struct attribute_group *grp)
397 static inline int sysfs_add_link_to_group(struct kobject *kobj,
398 const char *group_name, struct kobject *target,
399 const char *link_name)
404 static inline void sysfs_remove_link_from_group(struct kobject *kobj,
405 const char *group_name, const char *link_name)
409 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
414 static inline int __must_check sysfs_init(void)
419 #endif /* CONFIG_SYSFS */
421 static inline int __must_check sysfs_create_file(struct kobject *kobj,
422 const struct attribute *attr)
424 return sysfs_create_file_ns(kobj, attr, NULL);
427 static inline void sysfs_remove_file(struct kobject *kobj,
428 const struct attribute *attr)
430 return sysfs_remove_file_ns(kobj, attr, NULL);
433 static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
434 const char *old_name, const char *new_name)
436 return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL);
439 static inline void sysfs_notify_dirent(struct kernfs_node *kn)
444 static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
445 const unsigned char *name)
447 return kernfs_find_and_get(parent, name);
450 static inline struct kernfs_node *sysfs_get(struct kernfs_node *kn)
456 static inline void sysfs_put(struct kernfs_node *kn)
461 #endif /* _SYSFS_H_ */