1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * sysfs.h - definitions for the device driver filesystem
4  *
5  * Copyright (c) 2001,2002 Patrick Mochel
6  * Copyright (c) 2004 Silicon Graphics, Inc.
7  * Copyright (c) 2007 SUSE Linux Products GmbH
8  * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
9  *
10  * Please see Documentation/filesystems/sysfs.rst for more information.
11  */
12 
13 #ifndef _SYSFS_H_
14 #define _SYSFS_H_
15 
16 #include <linux/kernfs.h>
17 #include <linux/compiler.h>
18 #include <linux/errno.h>
19 #include <linux/list.h>
20 #include <linux/lockdep.h>
21 #include <linux/kobject_ns.h>
22 #include <linux/stat.h>
23 #include <linux/atomic.h>
24 
25 struct kobject;
26 struct module;
27 struct bin_attribute;
28 enum kobj_ns_type;
29 
30 struct attribute {
31 	const char		*name;
32 	umode_t			mode;
33 #ifdef CONFIG_DEBUG_LOCK_ALLOC
34 	bool			ignore_lockdep:1;
35 	struct lock_class_key	*key;
36 	struct lock_class_key	skey;
37 #endif
38 };
39 
40 /**
41  *	sysfs_attr_init - initialize a dynamically allocated sysfs attribute
42  *	@attr: struct attribute to initialize
43  *
44  *	Initialize a dynamically allocated struct attribute so we can
45  *	make lockdep happy.  This is a new requirement for attributes
46  *	and initially this is only needed when lockdep is enabled.
47  *	Lockdep gives a nice error when your attribute is added to
48  *	sysfs if you don't have this.
49  */
50 #ifdef CONFIG_DEBUG_LOCK_ALLOC
51 #define sysfs_attr_init(attr)				\
52 do {							\
53 	static struct lock_class_key __key;		\
54 							\
55 	(attr)->key = &__key;				\
56 } while (0)
57 #else
58 #define sysfs_attr_init(attr) do {} while (0)
59 #endif
60 
61 /**
62  * struct attribute_group - data structure used to declare an attribute group.
63  * @name:	Optional: Attribute group name
64  *		If specified, the attribute group will be created in
65  *		a new subdirectory with this name.
66  * @is_visible:	Optional: Function to return permissions associated with an
67  *		attribute of the group. Will be called repeatedly for each
68  *		non-binary attribute in the group. Only read/write
69  *		permissions as well as SYSFS_PREALLOC are accepted. Must
70  *		return 0 if an attribute is not visible. The returned value
71  *		will replace static permissions defined in struct attribute.
72  * @is_bin_visible:
73  *		Optional: Function to return permissions associated with a
74  *		binary attribute of the group. Will be called repeatedly
75  *		for each binary attribute in the group. Only read/write
76  *		permissions as well as SYSFS_PREALLOC are accepted. Must
77  *		return 0 if a binary attribute is not visible. The returned
78  *		value will replace static permissions defined in
79  *		struct bin_attribute.
80  * @attrs:	Pointer to NULL terminated list of attributes.
81  * @bin_attrs:	Pointer to NULL terminated list of binary attributes.
82  *		Either attrs or bin_attrs or both must be provided.
83  */
84 struct attribute_group {
85 	const char		*name;
86 	umode_t			(*is_visible)(struct kobject *,
87 					      struct attribute *, int);
88 	umode_t			(*is_bin_visible)(struct kobject *,
89 						  struct bin_attribute *, int);
90 	struct attribute	**attrs;
91 	struct bin_attribute	**bin_attrs;
92 };
93 
94 /*
95  * Use these macros to make defining attributes easier.
96  * See include/linux/device.h for examples..
97  */
98 
99 #define SYSFS_PREALLOC 010000
100 
101 #define __ATTR(_name, _mode, _show, _store) {				\
102 	.attr = {.name = __stringify(_name),				\
103 		 .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },		\
104 	.show	= _show,						\
105 	.store	= _store,						\
106 }
107 
108 #define __ATTR_PREALLOC(_name, _mode, _show, _store) {			\
109 	.attr = {.name = __stringify(_name),				\
110 		 .mode = SYSFS_PREALLOC | VERIFY_OCTAL_PERMISSIONS(_mode) },\
111 	.show	= _show,						\
112 	.store	= _store,						\
113 }
114 
115 #define __ATTR_RO(_name) {						\
116 	.attr	= { .name = __stringify(_name), .mode = 0444 },		\
117 	.show	= _name##_show,						\
118 }
119 
120 #define __ATTR_RO_MODE(_name, _mode) {					\
121 	.attr	= { .name = __stringify(_name),				\
122 		    .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },		\
123 	.show	= _name##_show,						\
124 }
125 
126 #define __ATTR_RW_MODE(_name, _mode) {					\
127 	.attr	= { .name = __stringify(_name),				\
128 		    .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },		\
129 	.show	= _name##_show,						\
130 	.store	= _name##_store,					\
131 }
132 
133 #define __ATTR_WO(_name) {						\
134 	.attr	= { .name = __stringify(_name), .mode = 0200 },		\
135 	.store	= _name##_store,					\
136 }
137 
138 #define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store)
139 
140 #define __ATTR_NULL { .attr = { .name = NULL } }
141 
142 #ifdef CONFIG_DEBUG_LOCK_ALLOC
143 #define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) {	\
144 	.attr = {.name = __stringify(_name), .mode = _mode,	\
145 			.ignore_lockdep = true },		\
146 	.show		= _show,				\
147 	.store		= _store,				\
148 }
149 #else
150 #define __ATTR_IGNORE_LOCKDEP	__ATTR
151 #endif
152 
153 #define __ATTRIBUTE_GROUPS(_name)				\
154 static const struct attribute_group *_name##_groups[] = {	\
155 	&_name##_group,						\
156 	NULL,							\
157 }
158 
159 #define ATTRIBUTE_GROUPS(_name)					\
160 static const struct attribute_group _name##_group = {		\
161 	.attrs = _name##_attrs,					\
162 };								\
163 __ATTRIBUTE_GROUPS(_name)
164 
165 #define BIN_ATTRIBUTE_GROUPS(_name)				\
166 static const struct attribute_group _name##_group = {		\
167 	.bin_attrs = _name##_attrs,				\
168 };								\
169 __ATTRIBUTE_GROUPS(_name)
170 
171 struct file;
172 struct vm_area_struct;
173 struct address_space;
174 
175 struct bin_attribute {
176 	struct attribute	attr;
177 	size_t			size;
178 	void			*private;
179 	struct address_space *(*f_mapping)(void);
180 	ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
181 			char *, loff_t, size_t);
182 	ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
183 			 char *, loff_t, size_t);
184 	int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
185 		    struct vm_area_struct *vma);
186 };
187 
188 /**
189  *	sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
190  *	@attr: struct bin_attribute to initialize
191  *
192  *	Initialize a dynamically allocated struct bin_attribute so we
193  *	can make lockdep happy.  This is a new requirement for
194  *	attributes and initially this is only needed when lockdep is
195  *	enabled.  Lockdep gives a nice error when your attribute is
196  *	added to sysfs if you don't have this.
197  */
198 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
199 
200 /* macros to create static binary attributes easier */
201 #define __BIN_ATTR(_name, _mode, _read, _write, _size) {		\
202 	.attr = { .name = __stringify(_name), .mode = _mode },		\
203 	.read	= _read,						\
204 	.write	= _write,						\
205 	.size	= _size,						\
206 }
207 
208 #define __BIN_ATTR_RO(_name, _size) {					\
209 	.attr	= { .name = __stringify(_name), .mode = 0444 },		\
210 	.read	= _name##_read,						\
211 	.size	= _size,						\
212 }
213 
214 #define __BIN_ATTR_WO(_name, _size) {					\
215 	.attr	= { .name = __stringify(_name), .mode = 0200 },		\
216 	.write	= _name##_write,					\
217 	.size	= _size,						\
218 }
219 
220 #define __BIN_ATTR_RW(_name, _size)					\
221 	__BIN_ATTR(_name, 0644, _name##_read, _name##_write, _size)
222 
223 #define __BIN_ATTR_NULL __ATTR_NULL
224 
225 #define BIN_ATTR(_name, _mode, _read, _write, _size)			\
226 struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read,	\
227 					_write, _size)
228 
229 #define BIN_ATTR_RO(_name, _size)					\
230 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)
231 
232 #define BIN_ATTR_WO(_name, _size)					\
233 struct bin_attribute bin_attr_##_name = __BIN_ATTR_WO(_name, _size)
234 
235 #define BIN_ATTR_RW(_name, _size)					\
236 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
237 
238 
239 #define __BIN_ATTR_ADMIN_RO(_name, _size) {					\
240 	.attr	= { .name = __stringify(_name), .mode = 0400 },		\
241 	.read	= _name##_read,						\
242 	.size	= _size,						\
243 }
244 
245 #define __BIN_ATTR_ADMIN_RW(_name, _size)					\
246 	__BIN_ATTR(_name, 0600, _name##_read, _name##_write, _size)
247 
248 #define BIN_ATTR_ADMIN_RO(_name, _size)					\
249 struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RO(_name, _size)
250 
251 #define BIN_ATTR_ADMIN_RW(_name, _size)					\
252 struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RW(_name, _size)
253 
254 struct sysfs_ops {
255 	ssize_t	(*show)(struct kobject *, struct attribute *, char *);
256 	ssize_t	(*store)(struct kobject *, struct attribute *, const char *, size_t);
257 };
258 
259 #ifdef CONFIG_SYSFS
260 
261 int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
262 void sysfs_remove_dir(struct kobject *kobj);
263 int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
264 				     const void *new_ns);
265 int __must_check sysfs_move_dir_ns(struct kobject *kobj,
266 				   struct kobject *new_parent_kobj,
267 				   const void *new_ns);
268 int __must_check sysfs_create_mount_point(struct kobject *parent_kobj,
269 					  const char *name);
270 void sysfs_remove_mount_point(struct kobject *parent_kobj,
271 			      const char *name);
272 
273 int __must_check sysfs_create_file_ns(struct kobject *kobj,
274 				      const struct attribute *attr,
275 				      const void *ns);
276 int __must_check sysfs_create_files(struct kobject *kobj,
277 				   const struct attribute * const *attr);
278 int __must_check sysfs_chmod_file(struct kobject *kobj,
279 				  const struct attribute *attr, umode_t mode);
280 struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
281 						  const struct attribute *attr);
282 void sysfs_unbreak_active_protection(struct kernfs_node *kn);
283 void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
284 			  const void *ns);
285 bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
286 void sysfs_remove_files(struct kobject *kobj, const struct attribute * const *attr);
287 
288 int __must_check sysfs_create_bin_file(struct kobject *kobj,
289 				       const struct bin_attribute *attr);
290 void sysfs_remove_bin_file(struct kobject *kobj,
291 			   const struct bin_attribute *attr);
292 
293 int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
294 				   const char *name);
295 int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
296 					  struct kobject *target,
297 					  const char *name);
298 void sysfs_remove_link(struct kobject *kobj, const char *name);
299 
300 int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
301 			 const char *old_name, const char *new_name,
302 			 const void *new_ns);
303 
304 void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
305 			const char *name);
306 
307 int __must_check sysfs_create_group(struct kobject *kobj,
308 				    const struct attribute_group *grp);
309 int __must_check sysfs_create_groups(struct kobject *kobj,
310 				     const struct attribute_group **groups);
311 int __must_check sysfs_update_groups(struct kobject *kobj,
312 				     const struct attribute_group **groups);
313 int sysfs_update_group(struct kobject *kobj,
314 		       const struct attribute_group *grp);
315 void sysfs_remove_group(struct kobject *kobj,
316 			const struct attribute_group *grp);
317 void sysfs_remove_groups(struct kobject *kobj,
318 			 const struct attribute_group **groups);
319 int sysfs_add_file_to_group(struct kobject *kobj,
320 			const struct attribute *attr, const char *group);
321 void sysfs_remove_file_from_group(struct kobject *kobj,
322 			const struct attribute *attr, const char *group);
323 int sysfs_merge_group(struct kobject *kobj,
324 		       const struct attribute_group *grp);
325 void sysfs_unmerge_group(struct kobject *kobj,
326 		       const struct attribute_group *grp);
327 int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
328 			    struct kobject *target, const char *link_name);
329 void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
330 				  const char *link_name);
331 int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
332 					 struct kobject *target_kobj,
333 					 const char *target_name,
334 					 const char *symlink_name);
335 
336 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
337 
338 int __must_check sysfs_init(void);
339 
sysfs_enable_ns(struct kernfs_node * kn)340 static inline void sysfs_enable_ns(struct kernfs_node *kn)
341 {
342 	return kernfs_enable_ns(kn);
343 }
344 
345 int sysfs_file_change_owner(struct kobject *kobj, const char *name, kuid_t kuid,
346 			    kgid_t kgid);
347 int sysfs_change_owner(struct kobject *kobj, kuid_t kuid, kgid_t kgid);
348 int sysfs_link_change_owner(struct kobject *kobj, struct kobject *targ,
349 			    const char *name, kuid_t kuid, kgid_t kgid);
350 int sysfs_groups_change_owner(struct kobject *kobj,
351 			      const struct attribute_group **groups,
352 			      kuid_t kuid, kgid_t kgid);
353 int sysfs_group_change_owner(struct kobject *kobj,
354 			     const struct attribute_group *groups, kuid_t kuid,
355 			     kgid_t kgid);
356 __printf(2, 3)
357 int sysfs_emit(char *buf, const char *fmt, ...);
358 __printf(3, 4)
359 int sysfs_emit_at(char *buf, int at, const char *fmt, ...);
360 
361 #else /* CONFIG_SYSFS */
362 
sysfs_create_dir_ns(struct kobject * kobj,const void * ns)363 static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
364 {
365 	return 0;
366 }
367 
sysfs_remove_dir(struct kobject * kobj)368 static inline void sysfs_remove_dir(struct kobject *kobj)
369 {
370 }
371 
sysfs_rename_dir_ns(struct kobject * kobj,const char * new_name,const void * new_ns)372 static inline int sysfs_rename_dir_ns(struct kobject *kobj,
373 				      const char *new_name, const void *new_ns)
374 {
375 	return 0;
376 }
377 
sysfs_move_dir_ns(struct kobject * kobj,struct kobject * new_parent_kobj,const void * new_ns)378 static inline int sysfs_move_dir_ns(struct kobject *kobj,
379 				    struct kobject *new_parent_kobj,
380 				    const void *new_ns)
381 {
382 	return 0;
383 }
384 
sysfs_create_mount_point(struct kobject * parent_kobj,const char * name)385 static inline int sysfs_create_mount_point(struct kobject *parent_kobj,
386 					   const char *name)
387 {
388 	return 0;
389 }
390 
sysfs_remove_mount_point(struct kobject * parent_kobj,const char * name)391 static inline void sysfs_remove_mount_point(struct kobject *parent_kobj,
392 					    const char *name)
393 {
394 }
395 
sysfs_create_file_ns(struct kobject * kobj,const struct attribute * attr,const void * ns)396 static inline int sysfs_create_file_ns(struct kobject *kobj,
397 				       const struct attribute *attr,
398 				       const void *ns)
399 {
400 	return 0;
401 }
402 
sysfs_create_files(struct kobject * kobj,const struct attribute * const * attr)403 static inline int sysfs_create_files(struct kobject *kobj,
404 				    const struct attribute * const *attr)
405 {
406 	return 0;
407 }
408 
sysfs_chmod_file(struct kobject * kobj,const struct attribute * attr,umode_t mode)409 static inline int sysfs_chmod_file(struct kobject *kobj,
410 				   const struct attribute *attr, umode_t mode)
411 {
412 	return 0;
413 }
414 
415 static inline struct kernfs_node *
sysfs_break_active_protection(struct kobject * kobj,const struct attribute * attr)416 sysfs_break_active_protection(struct kobject *kobj,
417 			      const struct attribute *attr)
418 {
419 	return NULL;
420 }
421 
sysfs_unbreak_active_protection(struct kernfs_node * kn)422 static inline void sysfs_unbreak_active_protection(struct kernfs_node *kn)
423 {
424 }
425 
sysfs_remove_file_ns(struct kobject * kobj,const struct attribute * attr,const void * ns)426 static inline void sysfs_remove_file_ns(struct kobject *kobj,
427 					const struct attribute *attr,
428 					const void *ns)
429 {
430 }
431 
sysfs_remove_file_self(struct kobject * kobj,const struct attribute * attr)432 static inline bool sysfs_remove_file_self(struct kobject *kobj,
433 					  const struct attribute *attr)
434 {
435 	return false;
436 }
437 
sysfs_remove_files(struct kobject * kobj,const struct attribute * const * attr)438 static inline void sysfs_remove_files(struct kobject *kobj,
439 				     const struct attribute * const *attr)
440 {
441 }
442 
sysfs_create_bin_file(struct kobject * kobj,const struct bin_attribute * attr)443 static inline int sysfs_create_bin_file(struct kobject *kobj,
444 					const struct bin_attribute *attr)
445 {
446 	return 0;
447 }
448 
sysfs_remove_bin_file(struct kobject * kobj,const struct bin_attribute * attr)449 static inline void sysfs_remove_bin_file(struct kobject *kobj,
450 					 const struct bin_attribute *attr)
451 {
452 }
453 
sysfs_create_link(struct kobject * kobj,struct kobject * target,const char * name)454 static inline int sysfs_create_link(struct kobject *kobj,
455 				    struct kobject *target, const char *name)
456 {
457 	return 0;
458 }
459 
sysfs_create_link_nowarn(struct kobject * kobj,struct kobject * target,const char * name)460 static inline int sysfs_create_link_nowarn(struct kobject *kobj,
461 					   struct kobject *target,
462 					   const char *name)
463 {
464 	return 0;
465 }
466 
sysfs_remove_link(struct kobject * kobj,const char * name)467 static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
468 {
469 }
470 
sysfs_rename_link_ns(struct kobject * k,struct kobject * t,const char * old_name,const char * new_name,const void * ns)471 static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t,
472 				       const char *old_name,
473 				       const char *new_name, const void *ns)
474 {
475 	return 0;
476 }
477 
sysfs_delete_link(struct kobject * k,struct kobject * t,const char * name)478 static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
479 				     const char *name)
480 {
481 }
482 
sysfs_create_group(struct kobject * kobj,const struct attribute_group * grp)483 static inline int sysfs_create_group(struct kobject *kobj,
484 				     const struct attribute_group *grp)
485 {
486 	return 0;
487 }
488 
sysfs_create_groups(struct kobject * kobj,const struct attribute_group ** groups)489 static inline int sysfs_create_groups(struct kobject *kobj,
490 				      const struct attribute_group **groups)
491 {
492 	return 0;
493 }
494 
sysfs_update_groups(struct kobject * kobj,const struct attribute_group ** groups)495 static inline int sysfs_update_groups(struct kobject *kobj,
496 				      const struct attribute_group **groups)
497 {
498 	return 0;
499 }
500 
sysfs_update_group(struct kobject * kobj,const struct attribute_group * grp)501 static inline int sysfs_update_group(struct kobject *kobj,
502 				const struct attribute_group *grp)
503 {
504 	return 0;
505 }
506 
sysfs_remove_group(struct kobject * kobj,const struct attribute_group * grp)507 static inline void sysfs_remove_group(struct kobject *kobj,
508 				      const struct attribute_group *grp)
509 {
510 }
511 
sysfs_remove_groups(struct kobject * kobj,const struct attribute_group ** groups)512 static inline void sysfs_remove_groups(struct kobject *kobj,
513 				       const struct attribute_group **groups)
514 {
515 }
516 
sysfs_add_file_to_group(struct kobject * kobj,const struct attribute * attr,const char * group)517 static inline int sysfs_add_file_to_group(struct kobject *kobj,
518 		const struct attribute *attr, const char *group)
519 {
520 	return 0;
521 }
522 
sysfs_remove_file_from_group(struct kobject * kobj,const struct attribute * attr,const char * group)523 static inline void sysfs_remove_file_from_group(struct kobject *kobj,
524 		const struct attribute *attr, const char *group)
525 {
526 }
527 
sysfs_merge_group(struct kobject * kobj,const struct attribute_group * grp)528 static inline int sysfs_merge_group(struct kobject *kobj,
529 		       const struct attribute_group *grp)
530 {
531 	return 0;
532 }
533 
sysfs_unmerge_group(struct kobject * kobj,const struct attribute_group * grp)534 static inline void sysfs_unmerge_group(struct kobject *kobj,
535 		       const struct attribute_group *grp)
536 {
537 }
538 
sysfs_add_link_to_group(struct kobject * kobj,const char * group_name,struct kobject * target,const char * link_name)539 static inline int sysfs_add_link_to_group(struct kobject *kobj,
540 		const char *group_name, struct kobject *target,
541 		const char *link_name)
542 {
543 	return 0;
544 }
545 
sysfs_remove_link_from_group(struct kobject * kobj,const char * group_name,const char * link_name)546 static inline void sysfs_remove_link_from_group(struct kobject *kobj,
547 		const char *group_name, const char *link_name)
548 {
549 }
550 
compat_only_sysfs_link_entry_to_kobj(struct kobject * kobj,struct kobject * target_kobj,const char * target_name,const char * symlink_name)551 static inline int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
552 						       struct kobject *target_kobj,
553 						       const char *target_name,
554 						       const char *symlink_name)
555 {
556 	return 0;
557 }
558 
sysfs_notify(struct kobject * kobj,const char * dir,const char * attr)559 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
560 				const char *attr)
561 {
562 }
563 
sysfs_init(void)564 static inline int __must_check sysfs_init(void)
565 {
566 	return 0;
567 }
568 
sysfs_enable_ns(struct kernfs_node * kn)569 static inline void sysfs_enable_ns(struct kernfs_node *kn)
570 {
571 }
572 
sysfs_file_change_owner(struct kobject * kobj,const char * name,kuid_t kuid,kgid_t kgid)573 static inline int sysfs_file_change_owner(struct kobject *kobj,
574 					  const char *name, kuid_t kuid,
575 					  kgid_t kgid)
576 {
577 	return 0;
578 }
579 
sysfs_link_change_owner(struct kobject * kobj,struct kobject * targ,const char * name,kuid_t kuid,kgid_t kgid)580 static inline int sysfs_link_change_owner(struct kobject *kobj,
581 					  struct kobject *targ,
582 					  const char *name, kuid_t kuid,
583 					  kgid_t kgid)
584 {
585 	return 0;
586 }
587 
sysfs_change_owner(struct kobject * kobj,kuid_t kuid,kgid_t kgid)588 static inline int sysfs_change_owner(struct kobject *kobj, kuid_t kuid, kgid_t kgid)
589 {
590 	return 0;
591 }
592 
sysfs_groups_change_owner(struct kobject * kobj,const struct attribute_group ** groups,kuid_t kuid,kgid_t kgid)593 static inline int sysfs_groups_change_owner(struct kobject *kobj,
594 			  const struct attribute_group **groups,
595 			  kuid_t kuid, kgid_t kgid)
596 {
597 	return 0;
598 }
599 
sysfs_group_change_owner(struct kobject * kobj,const struct attribute_group * groups,kuid_t kuid,kgid_t kgid)600 static inline int sysfs_group_change_owner(struct kobject *kobj,
601 					   const struct attribute_group *groups,
602 					   kuid_t kuid, kgid_t kgid)
603 {
604 	return 0;
605 }
606 
607 __printf(2, 3)
sysfs_emit(char * buf,const char * fmt,...)608 static inline int sysfs_emit(char *buf, const char *fmt, ...)
609 {
610 	return 0;
611 }
612 
613 __printf(3, 4)
sysfs_emit_at(char * buf,int at,const char * fmt,...)614 static inline int sysfs_emit_at(char *buf, int at, const char *fmt, ...)
615 {
616 	return 0;
617 }
618 #endif /* CONFIG_SYSFS */
619 
sysfs_create_file(struct kobject * kobj,const struct attribute * attr)620 static inline int __must_check sysfs_create_file(struct kobject *kobj,
621 						 const struct attribute *attr)
622 {
623 	return sysfs_create_file_ns(kobj, attr, NULL);
624 }
625 
sysfs_remove_file(struct kobject * kobj,const struct attribute * attr)626 static inline void sysfs_remove_file(struct kobject *kobj,
627 				     const struct attribute *attr)
628 {
629 	sysfs_remove_file_ns(kobj, attr, NULL);
630 }
631 
sysfs_rename_link(struct kobject * kobj,struct kobject * target,const char * old_name,const char * new_name)632 static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
633 				    const char *old_name, const char *new_name)
634 {
635 	return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL);
636 }
637 
sysfs_notify_dirent(struct kernfs_node * kn)638 static inline void sysfs_notify_dirent(struct kernfs_node *kn)
639 {
640 	kernfs_notify(kn);
641 }
642 
sysfs_get_dirent(struct kernfs_node * parent,const char * name)643 static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
644 						   const char *name)
645 {
646 	return kernfs_find_and_get(parent, name);
647 }
648 
sysfs_get(struct kernfs_node * kn)649 static inline struct kernfs_node *sysfs_get(struct kernfs_node *kn)
650 {
651 	kernfs_get(kn);
652 	return kn;
653 }
654 
sysfs_put(struct kernfs_node * kn)655 static inline void sysfs_put(struct kernfs_node *kn)
656 {
657 	kernfs_put(kn);
658 }
659 
660 #endif /* _SYSFS_H_ */
661