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* fs/sysfs/sysfs.h - sysfs internal header file
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007 Tejun Heo <>
* This file is released under the GPLv2.
#include <linux/fs.h>
struct sysfs_open_dirent;
/* type-specific structures for sysfs_dirent->s_* union members */
struct sysfs_elem_dir {
struct kobject *kobj;
/* children list starts here and goes through sd->s_sibling */
struct sysfs_dirent *children;
struct sysfs_elem_symlink {
struct sysfs_dirent *target_sd;
struct sysfs_elem_attr {
struct attribute *attr;
struct sysfs_open_dirent *open;
struct sysfs_elem_bin_attr {
struct bin_attribute *bin_attr;
struct hlist_head buffers;
struct sysfs_inode_attrs {
struct iattr ia_iattr;
void *ia_secdata;
u32 ia_secdata_len;
* sysfs_dirent - the building block of sysfs hierarchy. Each and
* every sysfs node is represented by single sysfs_dirent.
* As long as s_count reference is held, the sysfs_dirent itself is
* accessible. Dereferencing s_elem or any other outer entity
* requires s_active reference.
struct sysfs_dirent {
atomic_t s_count;
atomic_t s_active;
struct sysfs_dirent *s_parent;
struct sysfs_dirent *s_sibling;
const char *s_name;
union {
struct sysfs_elem_dir s_dir;
struct sysfs_elem_symlink s_symlink;
struct sysfs_elem_attr s_attr;
struct sysfs_elem_bin_attr s_bin_attr;
unsigned int s_flags;
ino_t s_ino;
umode_t s_mode;
struct sysfs_inode_attrs *s_iattr;
#define SYSFS_TYPE_MASK 0x00ff
#define SYSFS_DIR 0x0001
#define SYSFS_KOBJ_ATTR 0x0002
#define SYSFS_KOBJ_BIN_ATTR 0x0004
#define SYSFS_KOBJ_LINK 0x0008
#define SYSFS_FLAG_REMOVED 0x0200
static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
return sd->s_flags & SYSFS_TYPE_MASK;
* Context structure to be used while adding/removing nodes.
struct sysfs_addrm_cxt {
struct sysfs_dirent *parent_sd;
struct inode *parent_inode;
struct sysfs_dirent *removed;
int cnt;
* mount.c
extern struct sysfs_dirent sysfs_root;
extern struct super_block *sysfs_sb;
extern struct kmem_cache *sysfs_dir_cachep;
* dir.c
extern struct mutex sysfs_mutex;
extern struct mutex sysfs_rename_mutex;
extern spinlock_t sysfs_assoc_lock;
extern const struct file_operations sysfs_dir_operations;
extern const struct inode_operations sysfs_dir_inode_operations;
struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
void sysfs_put_active_two(struct sysfs_dirent *sd);
void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
struct sysfs_dirent *parent_sd);
int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
const unsigned char *name);
struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
const unsigned char *name);
struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
void release_sysfs_dirent(struct sysfs_dirent *sd);
int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd);
void sysfs_remove_subdir(struct sysfs_dirent *sd);
static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
if (sd) {
return sd;
#define sysfs_get(sd) __sysfs_get(sd)
static inline void __sysfs_put(struct sysfs_dirent *sd)
if (sd && atomic_dec_and_test(&sd->s_count))
#define sysfs_put(sd) __sysfs_put(sd)
* inode.c
struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
void sysfs_delete_inode(struct inode *inode);
int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
int sysfs_inode_init(void);
* file.c
extern const struct file_operations sysfs_file_operations;
int sysfs_add_file(struct sysfs_dirent *dir_sd,
const struct attribute *attr, int type);
int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
const struct attribute *attr, int type, mode_t amode);
* bin.c
extern const struct file_operations bin_fops;
void unmap_bin_file(struct sysfs_dirent *attr_sd);
* symlink.c
extern const struct inode_operations sysfs_symlink_inode_operations;