#ifndef _LINUX_FS_STRUCT_H
  #define _LINUX_FS_STRUCT_H

  #include <linux/path.h>

  #include <linux/spinlock.h>
  #include <linux/seqlock.h>

  
  struct fs_struct {

  	int users;

  	spinlock_t lock;

  	seqcount_t seq;

  	int umask;

  	int in_exec;

  	struct path root, pwd;

  };

  extern struct kmem_cache *fs_cachep;

  extern void exit_fs(struct task_struct *);

  extern void set_fs_root(struct fs_struct *, struct path *);
  extern void set_fs_pwd(struct fs_struct *, struct path *);

  extern struct fs_struct *copy_fs_struct(struct fs_struct *);

  extern void free_fs_struct(struct fs_struct *);

  extern void daemonize_fs_struct(void);
  extern int unshare_fs_struct(void);

  static inline void get_fs_root(struct fs_struct *fs, struct path *root)
  {

  	spin_lock(&fs->lock);

  	*root = fs->root;
  	path_get(root);

  	spin_unlock(&fs->lock);

  }
  
  static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
  {

  	spin_lock(&fs->lock);

  	*pwd = fs->pwd;
  	path_get(pwd);

  	spin_unlock(&fs->lock);

  }
  
  static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
  				       struct path *pwd)
  {

  	spin_lock(&fs->lock);

  	*root = fs->root;
  	path_get(root);
  	*pwd = fs->pwd;
  	path_get(pwd);

  	spin_unlock(&fs->lock);

  }

  #endif /* _LINUX_FS_STRUCT_H */