/*

    File: fs/ext4/acl.h

  
    (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
  */
  
  #include <linux/posix_acl_xattr.h>

  #define EXT4_ACL_VERSION	0x0001

  
  typedef struct {
  	__le16		e_tag;
  	__le16		e_perm;
  	__le32		e_id;

  } ext4_acl_entry;

  
  typedef struct {
  	__le16		e_tag;
  	__le16		e_perm;

  } ext4_acl_entry_short;

  
  typedef struct {
  	__le32		a_version;

  } ext4_acl_header;

  static inline size_t ext4_acl_size(int count)

  {
  	if (count <= 4) {

  		return sizeof(ext4_acl_header) +
  		       count * sizeof(ext4_acl_entry_short);

  	} else {

  		return sizeof(ext4_acl_header) +
  		       4 * sizeof(ext4_acl_entry_short) +
  		       (count - 4) * sizeof(ext4_acl_entry);

  	}
  }

  static inline int ext4_acl_count(size_t size)

  {
  	ssize_t s;

  	size -= sizeof(ext4_acl_header);
  	s = size - 4 * sizeof(ext4_acl_entry_short);

  	if (s < 0) {

  		if (size % sizeof(ext4_acl_entry_short))

  			return -1;

  		return size / sizeof(ext4_acl_entry_short);

  	} else {

  		if (s % sizeof(ext4_acl_entry))

  			return -1;

  		return s / sizeof(ext4_acl_entry) + 4;

  	}
  }

  #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL

  /* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl

     if the ACL has not been cached */

  #define EXT4_ACL_NOT_CACHED ((void *)-1)

  
  /* acl.c */

  extern int ext4_permission (struct inode *, int, struct nameidata *);
  extern int ext4_acl_chmod (struct inode *);
  extern int ext4_init_acl (handle_t *, struct inode *, struct inode *);

  #else  /* CONFIG_EXT4DEV_FS_POSIX_ACL */

  #include <linux/sched.h>

  #define ext4_permission NULL

  
  static inline int

  ext4_acl_chmod(struct inode *inode)

  {
  	return 0;
  }
  
  static inline int

  ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)

  {
  	return 0;
  }

  #endif  /* CONFIG_EXT4DEV_FS_POSIX_ACL */