extern struct vfsmount * sysfs_mount;extern kmem_cache_t *sysfs_dir_cachep; extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,				umode_t, int); extern int sysfs_add_file(struct dentry *, const struct attribute *, int);extern void sysfs_hash_and_remove(struct dentry * dir, const char * name);extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);extern void sysfs_remove_subdir(struct dentry *); extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); extern struct rw_semaphore sysfs_rename_sem;extern struct super_block * sysfs_sb;extern const struct file_operations sysfs_dir_operations;extern const struct file_operations sysfs_file_operations;extern const struct file_operations bin_fops;extern struct inode_operations sysfs_dir_inode_operations;extern struct inode_operations sysfs_symlink_inode_operations; struct sysfs_symlink {	char * link_name;	struct kobject * target_kobj;}; static inline struct kobject * to_kobj(struct dentry * dentry){	struct sysfs_dirent * sd = dentry->d_fsdata;	return ((struct kobject *) sd->s_element);} static inline struct attribute * to_attr(struct dentry * dentry){	struct sysfs_dirent * sd = dentry->d_fsdata;	return ((struct attribute *) sd->s_element);} static inline struct bin_attribute * to_bin_attr(struct dentry * dentry){	struct sysfs_dirent * sd = dentry->d_fsdata;	return ((struct bin_attribute *) sd->s_element);} static inline struct kobject *sysfs_get_kobject(struct dentry *dentry){	struct kobject * kobj = NULL; 	spin_lock(&dcache_lock);	if (!d_unhashed(dentry)) {		struct sysfs_dirent * sd = dentry->d_fsdata;		if (sd->s_type & SYSFS_KOBJ_LINK) {			struct sysfs_symlink * sl = sd->s_element;			kobj = kobject_get(sl->target_kobj);		} else			kobj = kobject_get(sd->s_element);	}	spin_unlock(&dcache_lock); 	return kobj;} static inline void release_sysfs_dirent(struct sysfs_dirent * sd){	if (sd->s_type & SYSFS_KOBJ_LINK) {		struct sysfs_symlink * sl = sd->s_element;		kfree(sl->link_name);		kobject_put(sl->target_kobj);		kfree(sl);	}	kfree(sd->s_iattr);	kmem_cache_free(sysfs_dir_cachep, sd);} static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd){	if (sd) {		WARN_ON(!atomic_read(&sd->s_count));		atomic_inc(&sd->s_count);	}	return sd;} static inline void sysfs_put(struct sysfs_dirent * sd){	if (atomic_dec_and_test(&sd->s_count))		release_sysfs_dirent(sd);}