/* 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

#ifdef CONFIG_CFI
#define __SYSFS_FUNCTION_ALTERNATIVE(MEMBERS...) struct { MEMBERS }
#else
#define __SYSFS_FUNCTION_ALTERNATIVE(MEMBERS...) union { MEMBERS }
#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;
        __SYSFS_FUNCTION_ALTERNATIVE(
                umode_t                 (*is_visible)(struct kobject *,
                                                      struct attribute *, int);
                umode_t                 (*is_visible_const)(struct kobject *,
                                                            const 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);
        union {
                struct attribute        **attrs;
                const struct attribute  *const *attrs_const;
        };
        const struct bin_attribute      *const *bin_attrs;
};

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

#define __ATTR_RO(_name)                                                \
        __ATTR_RO_MODE(_name, 0444)

#define __ATTR_RW_MODE(_name, _mode)                                    \
        __ATTR(_name, _mode, _name##_show, _name##_store)

#define __ATTR_WO(_name)                                                \
        __ATTR(_name, 0200, NULL, _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 = _Generic(_name##_attrs,                        \
                          struct attribute **:                  \
                                _name##_attrs,                  \
                          const struct attribute *const *:      \
                                (void *)_name##_attrs           \
        ),                                                      \
};                                                              \
__ATTRIBUTE_GROUPS(_name)

#define BIN_ATTRIBUTE_GROUPS(_name)                             \
static const struct attribute_group _name##_group = {           \
        .bin_attrs = _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 (*write)(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);
}

/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */
#define VERIFY_OCTAL_PERMISSIONS(perms)                                         \
        (BUILD_BUG_ON_ZERO((perms) < 0) +                                       \
         BUILD_BUG_ON_ZERO((perms) > 0777) +                                    \
         /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */                \
         BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) +       \
         BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) +              \
         /* USER_WRITABLE >= GROUP_WRITABLE */                                  \
         BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) +       \
         /* OTHER_WRITABLE?  Generally considered a bad idea. */                \
         BUILD_BUG_ON_ZERO((perms) & 2) +                                       \
         (perms))

#endif /* _SYSFS_H_ */