/*
    File: linux/posix_acl.h
  
    (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
  */
  
  
  #ifndef __LINUX_POSIX_ACL_H
  #define __LINUX_POSIX_ACL_H

  #include <linux/bug.h>

  #include <linux/slab.h>

  #include <linux/rcupdate.h>

  #include <uapi/linux/posix_acl.h>

  
  struct posix_acl_entry {
  	short			e_tag;
  	unsigned short		e_perm;

  	union {
  		kuid_t		e_uid;
  		kgid_t		e_gid;

  	};

  };
  
  struct posix_acl {

  	atomic_t		a_refcount;
  	struct rcu_head		a_rcu;

  	unsigned int		a_count;
  	struct posix_acl_entry	a_entries[0];
  };
  
  #define FOREACH_ACL_ENTRY(pa, acl, pe) \
  	for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
  
  
  /*
   * Duplicate an ACL handle.
   */
  static inline struct posix_acl *
  posix_acl_dup(struct posix_acl *acl)
  {
  	if (acl)
  		atomic_inc(&acl->a_refcount);
  	return acl;
  }
  
  /*
   * Free an ACL handle.
   */
  static inline void
  posix_acl_release(struct posix_acl *acl)
  {
  	if (acl && atomic_dec_and_test(&acl->a_refcount))

  		kfree_rcu(acl, a_rcu);

  }
  
  
  /* posix_acl.c */

  extern void posix_acl_init(struct posix_acl *, int);

  extern struct posix_acl *posix_acl_alloc(int, gfp_t);

  extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);

  extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);

  extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);

  extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);

  extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);

  extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);

  
  extern struct posix_acl *get_posix_acl(struct inode *, int);
  extern int set_posix_acl(struct inode *, int, struct posix_acl *);

  #ifdef CONFIG_FS_POSIX_ACL

  extern int posix_acl_chmod(struct inode *, umode_t);
  extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
  		struct posix_acl **);

  extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);

  extern int simple_set_acl(struct inode *, struct posix_acl *, int);
  extern int simple_acl_create(struct inode *, struct inode *);

  struct posix_acl *get_cached_acl(struct inode *inode, int type);
  struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
  void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
  void forget_cached_acl(struct inode *inode, int type);
  void forget_all_cached_acls(struct inode *inode);

  
  static inline void cache_no_acl(struct inode *inode)
  {

  	inode->i_acl = NULL;
  	inode->i_default_acl = NULL;

  }

  #else

  static inline int posix_acl_chmod(struct inode *inode, umode_t mode)

  {
  	return 0;
  }

  #define simple_set_acl		NULL
  
  static inline int simple_acl_create(struct inode *dir, struct inode *inode)
  {
  	return 0;
  }

  static inline void cache_no_acl(struct inode *inode)
  {
  }

  
  static inline int posix_acl_create(struct inode *inode, umode_t *mode,
  		struct posix_acl **default_acl, struct posix_acl **acl)
  {
  	*default_acl = *acl = NULL;
  	return 0;
  }

  
  static inline void forget_all_cached_acls(struct inode *inode)
  {
  }

  #endif /* CONFIG_FS_POSIX_ACL */

  struct posix_acl *get_acl(struct inode *inode, int type);

  #endif  /* __LINUX_POSIX_ACL_H */