Quelle sysfs.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* sysfs.h - definitions for the device driver filesystem
*
* Copyright (c) 2001,2002 Patrick Mochel
* Copyright (c) 2004 Silicon Graphics, Inc.
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
*
* Please see Documentation/filesystems/sysfs.rst for more information.
*/

#ifndef _SYSFS_H_
#define _SYSFS_H_

#include <linux/kernfs.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/kobject_ns.h>
#include <linux/stat.h>
#include <linux/atomic.h>

struct kobject;
struct module;
struct bin_attribute;
enum kobj_ns_type;

struct attribute {
const char  *name;
umode_t   mode;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
bool   ignore_lockdep:1;
struct lock_class_key *key;
struct lock_class_key skey;
#endif
};

/**
* sysfs_attr_init - initialize a dynamically allocated sysfs attribute
* @attr: struct attribute to initialize
*
* Initialize a dynamically allocated struct attribute so we can
* make lockdep happy.  This is a new requirement for attributes
* and initially this is only needed when lockdep is enabled.
* Lockdep gives a nice error when your attribute is added to
* sysfs if you don't have this.
*/
#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define sysfs_attr_init(attr)    \
do {       \
static struct lock_class_key __key;  \
       \
(attr)->key = &__key;    \
} while (0)
#else
#define sysfs_attr_init(attr) do {} while (0)
#endif

/**
* struct attribute_group - data structure used to declare an attribute group.
* @name: Optional: Attribute group name
* If specified, the attribute group will be created in a
* new subdirectory with this name. Additionally when a
* group is named, @is_visible and @is_bin_visible may
* return SYSFS_GROUP_INVISIBLE to control visibility of
* the directory itself.
* @is_visible: Optional: Function to return permissions associated with an
* attribute of the group. Will be called repeatedly for
* each non-binary attribute in the group. Only read/write
* permissions as well as SYSFS_PREALLOC are accepted. Must
* return 0 if an attribute is not visible. The returned
* value will replace static permissions defined in struct
* attribute. Use SYSFS_GROUP_VISIBLE() when assigning this
* callback to specify separate _group_visible() and
* _attr_visible() handlers.
* @is_bin_visible:
* Optional: Function to return permissions associated with a
* binary attribute of the group. Will be called repeatedly
* for each binary attribute in the group. Only read/write
* permissions as well as SYSFS_PREALLOC (and the
* visibility flags for named groups) are accepted. Must
* return 0 if a binary attribute is not visible. The
* returned value will replace static permissions defined
* in struct bin_attribute. If @is_visible is not set, Use
* SYSFS_GROUP_VISIBLE() when assigning this callback to
* specify separate _group_visible() and _attr_visible()
* handlers.
* @bin_size:
* Optional: Function to return the size of a binary attribute
* of the group. Will be called repeatedly for each binary
* attribute in the group. Overwrites the size field embedded
* inside the attribute itself.
* @attrs: Pointer to NULL terminated list of attributes.
* @bin_attrs: Pointer to NULL terminated list of binary attributes.
* Either attrs or bin_attrs or both must be provided.
*/
struct attribute_group {
const char  *name;
umode_t   (*is_visible)(struct kobject *,
           struct attribute *, int);
umode_t   (*is_bin_visible)(struct kobject *,
        const struct bin_attribute *, int);
size_t   (*bin_size)(struct kobject *,
         const struct bin_attribute *,
         int);
struct attribute **attrs;
union {
  const struct bin_attribute *const *bin_attrs;
  const struct bin_attribute *const *bin_attrs_new;
};
};

#define SYSFS_PREALLOC  010000
#define SYSFS_GROUP_INVISIBLE 020000

/*
* DEFINE_SYSFS_GROUP_VISIBLE(name):
* A helper macro to pair with the assignment of ".is_visible =
* SYSFS_GROUP_VISIBLE(name)", that arranges for the directory
* associated with a named attribute_group to optionally be hidden.
* This allows for static declaration of attribute_groups, and the
* simplification of attribute visibility lifetime that implies,
* without polluting sysfs with empty attribute directories.
* Ex.
*
* static umode_t example_attr_visible(struct kobject *kobj,
*                                   struct attribute *attr, int n)
* {
*       if (example_attr_condition)
*               return 0;
*       else if (ro_attr_condition)
*               return 0444;
*       return a->mode;
* }
*
* static bool example_group_visible(struct kobject *kobj)
* {
*       if (example_group_condition)
*               return false;
*       return true;
* }
*
* DEFINE_SYSFS_GROUP_VISIBLE(example);
*
* static struct attribute_group example_group = {
*       .name = "example",
*       .is_visible = SYSFS_GROUP_VISIBLE(example),
*       .attrs = &example_attrs,
* };
*
* Note that it expects <name>_attr_visible and <name>_group_visible to
* be defined. For cases where individual attributes do not need
* separate visibility consideration, only entire group visibility at
* once, see DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE().
*/
#define DEFINE_SYSFS_GROUP_VISIBLE(name)                             \
static inline umode_t sysfs_group_visible_##name(            \
  struct kobject *kobj, struct attribute *attr, int n) \
{                                                            \
  if (n == 0 && !name##_group_visible(kobj))           \
   return SYSFS_GROUP_INVISIBLE;                \
  return name##_attr_visible(kobj, attr, n);           \
}

/*
* DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(name):
* A helper macro to pair with SYSFS_GROUP_VISIBLE() that like
* DEFINE_SYSFS_GROUP_VISIBLE() controls group visibility, but does
* not require the implementation of a per-attribute visibility
* callback.
* Ex.
*
* static bool example_group_visible(struct kobject *kobj)
* {
*       if (example_group_condition)
*               return false;
*       return true;
* }
*
* DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(example);
*
* static struct attribute_group example_group = {
*       .name = "example",
*       .is_visible = SYSFS_GROUP_VISIBLE(example),
*       .attrs = &example_attrs,
* };
*/
#define DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(name)                   \
static inline umode_t sysfs_group_visible_##name(         \
  struct kobject *kobj, struct attribute *a, int n) \
{                                                         \
  if (n == 0 && !name##_group_visible(kobj))        \
   return SYSFS_GROUP_INVISIBLE;             \
  return a->mode;                                   \
}

/*
* Same as DEFINE_SYSFS_GROUP_VISIBLE, but for groups with only binary
* attributes. If an attribute_group defines both text and binary
* attributes, the group visibility is determined by the function
* specified to is_visible() not is_bin_visible()
*/
#define DEFINE_SYSFS_BIN_GROUP_VISIBLE(name)                                   \
static inline umode_t sysfs_group_visible_##name(                      \
  struct kobject *kobj, const struct bin_attribute *attr, int n) \
{                                                                      \
  if (n == 0 && !name##_group_visible(kobj))                     \
   return SYSFS_GROUP_INVISIBLE;                          \
  return name##_attr_visible(kobj, attr, n);                     \
}

#define DEFINE_SIMPLE_SYSFS_BIN_GROUP_VISIBLE(name)                         \
static inline umode_t sysfs_group_visible_##name(                   \
  struct kobject *kobj, const struct bin_attribute *a, int n) \
{                                                                   \
  if (n == 0 && !name##_group_visible(kobj))                  \
   return SYSFS_GROUP_INVISIBLE;                       \
  return a->mode;                                             \
}

#define SYSFS_GROUP_VISIBLE(fn) sysfs_group_visible_##fn

/*
* Use these macros to make defining attributes easier.
* See include/linux/device.h for examples..
*/

#define __ATTR(_name, _mode, _show, _store) {    \
.attr = {.name = __stringify(_name),    \
   .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },  \
.show = _show,      \
.store = _store,      \
}

#define __ATTR_PREALLOC(_name, _mode, _show, _store) {   \
.attr = {.name = __stringify(_name),    \
   .mode = SYSFS_PREALLOC | VERIFY_OCTAL_PERMISSIONS(_mode) },\
.show = _show,      \
.store = _store,      \
}

#define __ATTR_RO(_name) {      \
.attr = { .name = __stringify(_name), .mode = 0444 },  \
.show = _name##_show,      \
}

#define __ATTR_RO_MODE(_name, _mode) {     \
.attr = { .name = __stringify(_name),    \
      .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },  \
.show = _name##_show,      \
}

#define __ATTR_RW_MODE(_name, _mode) {     \
.attr = { .name = __stringify(_name),    \
      .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },  \
.show = _name##_show,      \
.store = _name##_store,     \
}

#define __ATTR_WO(_name) {      \
.attr = { .name = __stringify(_name), .mode = 0200 },  \
.store = _name##_store,     \
}

#define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store)

#define __ATTR_NULL { .attr = { .name = NULL } }

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \
.attr = {.name = __stringify(_name), .mode = _mode, \
   .ignore_lockdep = true },  \
.show  = _show,    \
.store  = _store,    \
}
#else
#define __ATTR_IGNORE_LOCKDEP __ATTR
#endif

#define __ATTRIBUTE_GROUPS(_name)    \
static const struct attribute_group *_name##_groups[] = { \
&_name##_group,      \
NULL,       \
}

#define ATTRIBUTE_GROUPS(_name)     \
static const struct attribute_group _name##_group = {  \
.attrs = _name##_attrs,     \
};        \
__ATTRIBUTE_GROUPS(_name)

#define BIN_ATTRIBUTE_GROUPS(_name)    \
static const struct attribute_group _name##_group = {  \
.bin_attrs_new = _name##_attrs,    \
};        \
__ATTRIBUTE_GROUPS(_name)

struct file;
struct vm_area_struct;
struct address_space;

struct bin_attribute {
struct attribute attr;
size_t   size;
void   *private;
struct address_space *(*f_mapping)(void);
ssize_t (*read)(struct file *, struct kobject *, const struct bin_attribute *,
   char *, loff_t, size_t);
ssize_t (*read_new)(struct file *, struct kobject *, const struct bin_attribute *,
       char *, loff_t, size_t);
ssize_t (*write)(struct file *, struct kobject *, const struct bin_attribute *,
    char *, loff_t, size_t);
ssize_t (*write_new)(struct file *, struct kobject *,
        const struct bin_attribute *, char *, loff_t, size_t);
loff_t (*llseek)(struct file *, struct kobject *, const struct bin_attribute *,
    loff_t, int);
int (*mmap)(struct file *, struct kobject *, const struct bin_attribute *attr,
      struct vm_area_struct *vma);
};

/**
* sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
* @attr: struct bin_attribute to initialize
*
* Initialize a dynamically allocated struct bin_attribute so we
* can make lockdep happy.  This is a new requirement for
* attributes and initially this is only needed when lockdep is
* enabled.  Lockdep gives a nice error when your attribute is
* added to sysfs if you don't have this.
*/
#define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)

/* macros to create static binary attributes easier */
#define __BIN_ATTR(_name, _mode, _read, _write, _size) {  \
.attr = { .name = __stringify(_name), .mode = _mode },  \
.read = _read,       \
.write = _write,      \
.size = _size,      \
}

#define __BIN_ATTR_RO(_name, _size)     \
__BIN_ATTR(_name, 0444, _name##_read, NULL, _size)

#define __BIN_ATTR_WO(_name, _size)     \
__BIN_ATTR(_name, 0200, NULL, _name##_write, _size)

#define __BIN_ATTR_RW(_name, _size)     \
__BIN_ATTR(_name, 0644, _name##_read, _name##_write, _size)

#define __BIN_ATTR_NULL __ATTR_NULL

#define BIN_ATTR(_name, _mode, _read, _write, _size)   \
struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read, \
     _write, _size)

#define BIN_ATTR_RO(_name, _size)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)

#define BIN_ATTR_WO(_name, _size)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_WO(_name, _size)

#define BIN_ATTR_RW(_name, _size)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)

#define __BIN_ATTR_ADMIN_RO(_name, _size)    \
__BIN_ATTR(_name, 0400, _name##_read, NULL, _size)

#define __BIN_ATTR_ADMIN_RW(_name, _size)     \
__BIN_ATTR(_name, 0600, _name##_read, _name##_write, _size)

#define BIN_ATTR_ADMIN_RO(_name, _size)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RO(_name, _size)

#define BIN_ATTR_ADMIN_RW(_name, _size)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RW(_name, _size)

#define __BIN_ATTR_SIMPLE_RO(_name, _mode)    \
__BIN_ATTR(_name, _mode, sysfs_bin_attr_simple_read, NULL, 0)

#define BIN_ATTR_SIMPLE_RO(_name)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_SIMPLE_RO(_name, 0444)

#define BIN_ATTR_SIMPLE_ADMIN_RO(_name)     \
struct bin_attribute bin_attr_##_name = __BIN_ATTR_SIMPLE_RO(_name, 0400)

struct sysfs_ops {
ssize_t (*show)(struct kobject *, struct attribute *, char *);
ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
};

#ifdef CONFIG_SYSFS

int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
void sysfs_remove_dir(struct kobject *kobj);
int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
         const void *new_ns);
int __must_check sysfs_move_dir_ns(struct kobject *kobj,
       struct kobject *new_parent_kobj,
       const void *new_ns);
int __must_check sysfs_create_mount_point(struct kobject *parent_kobj,
       const char *name);
void sysfs_remove_mount_point(struct kobject *parent_kobj,
         const char *name);

int __must_check sysfs_create_file_ns(struct kobject *kobj,
          const struct attribute *attr,
          const void *ns);
int __must_check sysfs_create_files(struct kobject *kobj,
       const struct attribute * const *attr);
int __must_check sysfs_chmod_file(struct kobject *kobj,
      const struct attribute *attr, umode_t mode);
struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
        const struct attribute *attr);
void sysfs_unbreak_active_protection(struct kernfs_node *kn);
void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
     const void *ns);
bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
void sysfs_remove_files(struct kobject *kobj, const struct attribute * const *attr);

int __must_check sysfs_create_bin_file(struct kobject *kobj,
           const struct bin_attribute *attr);
void sysfs_remove_bin_file(struct kobject *kobj,
      const struct bin_attribute *attr);

int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
       const char *name);
int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
       struct kobject *target,
       const char *name);
void sysfs_remove_link(struct kobject *kobj, const char *name);

int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
    const char *old_name, const char *new_name,
    const void *new_ns);

void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
   const char *name);

int __must_check sysfs_create_group(struct kobject *kobj,
        const struct attribute_group *grp);
int __must_check sysfs_create_groups(struct kobject *kobj,
         const struct attribute_group **groups);
int __must_check sysfs_update_groups(struct kobject *kobj,
         const struct attribute_group **groups);
int sysfs_update_group(struct kobject *kobj,
         const struct attribute_group *grp);
void sysfs_remove_group(struct kobject *kobj,
   const struct attribute_group *grp);
void sysfs_remove_groups(struct kobject *kobj,
    const struct attribute_group **groups);
int sysfs_add_file_to_group(struct kobject *kobj,
   const struct attribute *attr, const char *group);
void sysfs_remove_file_from_group(struct kobject *kobj,
   const struct attribute *attr, const char *group);
int sysfs_merge_group(struct kobject *kobj,
         const struct attribute_group *grp);
void sysfs_unmerge_group(struct kobject *kobj,
         const struct attribute_group *grp);
int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
       struct kobject *target, const char *link_name);
void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
      const char *link_name);
int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
      struct kobject *target_kobj,
      const char *target_name,
      const char *symlink_name);

void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);

int __must_check sysfs_init(void);

static inline void sysfs_enable_ns(struct kernfs_node *kn)
{
return kernfs_enable_ns(kn);
}

int sysfs_file_change_owner(struct kobject *kobj, const char *name, kuid_t kuid,
       kgid_t kgid);
int sysfs_change_owner(struct kobject *kobj, kuid_t kuid, kgid_t kgid);
int sysfs_link_change_owner(struct kobject *kobj, struct kobject *targ,
       const char *name, kuid_t kuid, kgid_t kgid);
int sysfs_groups_change_owner(struct kobject *kobj,
         const struct attribute_group **groups,
         kuid_t kuid, kgid_t kgid);
int sysfs_group_change_owner(struct kobject *kobj,
        const struct attribute_group *groups, kuid_t kuid,
        kgid_t kgid);
__printf(2, 3)
int sysfs_emit(char *buf, const char *fmt, ...);
__printf(3, 4)
int sysfs_emit_at(char *buf, int at, const char *fmt, ...);

ssize_t sysfs_bin_attr_simple_read(struct file *file, struct kobject *kobj,
       const struct bin_attribute *attr, char *buf,
       loff_t off, size_t count);

#else /* CONFIG_SYSFS */

static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
return 0;
}

static inline void sysfs_remove_dir(struct kobject *kobj)
{
}

static inline int sysfs_rename_dir_ns(struct kobject *kobj,
          const char *new_name, const void *new_ns)
{
return 0;
}

static inline int sysfs_move_dir_ns(struct kobject *kobj,
        struct kobject *new_parent_kobj,
        const void *new_ns)
{
return 0;
}

static inline int sysfs_create_mount_point(struct kobject *parent_kobj,
        const char *name)
{
return 0;
}

static inline void sysfs_remove_mount_point(struct kobject *parent_kobj,
         const char *name)
{
}

static inline int sysfs_create_file_ns(struct kobject *kobj,
           const struct attribute *attr,
           const void *ns)
{
return 0;
}

static inline int sysfs_create_files(struct kobject *kobj,
        const struct attribute * const *attr)
{
return 0;
}

static inline int sysfs_chmod_file(struct kobject *kobj,
       const struct attribute *attr, umode_t mode)
{
return 0;
}

static inline struct kernfs_node *
sysfs_break_active_protection(struct kobject *kobj,
         const struct attribute *attr)
{
return NULL;
}

static inline void sysfs_unbreak_active_protection(struct kernfs_node *kn)
{
}

static inline void sysfs_remove_file_ns(struct kobject *kobj,
     const struct attribute *attr,
     const void *ns)
{
}

static inline bool sysfs_remove_file_self(struct kobject *kobj,
       const struct attribute *attr)
{
return false;
}

static inline void sysfs_remove_files(struct kobject *kobj,
         const struct attribute * const *attr)
{
}

static inline int sysfs_create_bin_file(struct kobject *kobj,
     const struct bin_attribute *attr)
{
return 0;
}

static inline void sysfs_remove_bin_file(struct kobject *kobj,
      const struct bin_attribute *attr)
{
}

static inline int sysfs_create_link(struct kobject *kobj,
        struct kobject *target, const char *name)
{
return 0;
}

static inline int sysfs_create_link_nowarn(struct kobject *kobj,
        struct kobject *target,
        const char *name)
{
return 0;
}

static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
{
}

static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t,
           const char *old_name,
           const char *new_name, const void *ns)
{
return 0;
}

static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
         const char *name)
{
}

static inline int sysfs_create_group(struct kobject *kobj,
         const struct attribute_group *grp)
{
return 0;
}

static inline int sysfs_create_groups(struct kobject *kobj,
          const struct attribute_group **groups)
{
return 0;
}

static inline int sysfs_update_groups(struct kobject *kobj,
          const struct attribute_group **groups)
{
return 0;
}

static inline int sysfs_update_group(struct kobject *kobj,
    const struct attribute_group *grp)
{
return 0;
}

static inline void sysfs_remove_group(struct kobject *kobj,
          const struct attribute_group *grp)
{
}

static inline void sysfs_remove_groups(struct kobject *kobj,
           const struct attribute_group **groups)
{
}

static inline int sysfs_add_file_to_group(struct kobject *kobj,
  const struct attribute *attr, const char *group)
{
return 0;
}

static inline void sysfs_remove_file_from_group(struct kobject *kobj,
  const struct attribute *attr, const char *group)
{
}

static inline int sysfs_merge_group(struct kobject *kobj,
         const struct attribute_group *grp)
{
return 0;
}

static inline void sysfs_unmerge_group(struct kobject *kobj,
         const struct attribute_group *grp)
{
}

static inline int sysfs_add_link_to_group(struct kobject *kobj,
  const char *group_name, struct kobject *target,
  const char *link_name)
{
return 0;
}

static inline void sysfs_remove_link_from_group(struct kobject *kobj,
  const char *group_name, const char *link_name)
{
}

static inline int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
             struct kobject *target_kobj,
             const char *target_name,
             const char *symlink_name)
{
return 0;
}

static inline void sysfs_notify(struct kobject *kobj, const char *dir,
    const char *attr)
{
}

static inline int __must_check sysfs_init(void)
{
return 0;
}

static inline void sysfs_enable_ns(struct kernfs_node *kn)
{
}

static inline int sysfs_file_change_owner(struct kobject *kobj,
       const char *name, kuid_t kuid,
       kgid_t kgid)
{
return 0;
}

static inline int sysfs_link_change_owner(struct kobject *kobj,
       struct kobject *targ,
       const char *name, kuid_t kuid,
       kgid_t kgid)
{
return 0;
}

static inline int sysfs_change_owner(struct kobject *kobj, kuid_t kuid, kgid_t kgid)
{
return 0;
}

static inline int sysfs_groups_change_owner(struct kobject *kobj,
     const struct attribute_group **groups,
     kuid_t kuid, kgid_t kgid)
{
return 0;
}

static inline int sysfs_group_change_owner(struct kobject *kobj,
        const struct attribute_group *groups,
        kuid_t kuid, kgid_t kgid)
{
return 0;
}

__printf(2, 3)
static inline int sysfs_emit(char *buf, const char *fmt, ...)
{
return 0;
}

__printf(3, 4)
static inline int sysfs_emit_at(char *buf, int at, const char *fmt, ...)
{
return 0;
}

static inline ssize_t sysfs_bin_attr_simple_read(struct file *file,
       struct kobject *kobj,
       const struct bin_attribute *attr,
       char *buf, loff_t off,
       size_t count)
{
return 0;
}
#endif /* CONFIG_SYSFS */

static inline int __must_check sysfs_create_file(struct kobject *kobj,
       const struct attribute *attr)
{
return sysfs_create_file_ns(kobj, attr, NULL);
}

static inline void sysfs_remove_file(struct kobject *kobj,
         const struct attribute *attr)
{
sysfs_remove_file_ns(kobj, attr, NULL);
}

static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
        const char *old_name, const char *new_name)
{
return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL);
}

static inline void sysfs_notify_dirent(struct kernfs_node *kn)
{
kernfs_notify(kn);
}

static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
         const char *name)
{
return kernfs_find_and_get(parent, name);
}

static inline struct kernfs_node *sysfs_get(struct kernfs_node *kn)
{
kernfs_get(kn);
return kn;
}

static inline void sysfs_put(struct kernfs_node *kn)
{
kernfs_put(kn);
}

#endif /* _SYSFS_H_ */

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