/*
   * Copyright (c) 2001-2005 Silicon Graphics, Inc.
   * All Rights Reserved.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it would be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  #ifndef __XFS_ACL_H__
  #define __XFS_ACL_H__
  
  struct inode;
  struct posix_acl;
  struct xfs_inode;
  
  #define XFS_ACL_NOT_PRESENT (-1)
  
  /* On-disk XFS access control list structure */
  struct xfs_acl_entry {
  	__be32	ae_tag;
  	__be32	ae_id;
  	__be16	ae_perm;
  	__be16	ae_pad;		/* fill the implicit hole in the structure */
  };
  
  struct xfs_acl {
  	__be32			acl_cnt;
  	struct xfs_acl_entry	acl_entry[0];
  };
  
  /*
   * The number of ACL entries allowed is defined by the on-disk format.
   * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
   * limited only by the maximum size of the xattr that stores the information.
   */
  #define XFS_ACL_MAX_ENTRIES(mp)	\
  	(xfs_sb_version_hascrc(&mp->m_sb) \
  		?  (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
  						sizeof(struct xfs_acl_entry) \
  		: 25)
  
  #define XFS_ACL_MAX_SIZE(mp) \
  	(sizeof(struct xfs_acl) + \
  		sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
  
  /* On-disk XFS extended attribute names */
  #define SGI_ACL_FILE		(unsigned char *)"SGI_ACL_FILE"
  #define SGI_ACL_DEFAULT		(unsigned char *)"SGI_ACL_DEFAULT"
  #define SGI_ACL_FILE_SIZE	(sizeof(SGI_ACL_FILE)-1)
  #define SGI_ACL_DEFAULT_SIZE	(sizeof(SGI_ACL_DEFAULT)-1)
  
  #ifdef CONFIG_XFS_POSIX_ACL
  extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
  extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
  extern int posix_acl_access_exists(struct inode *inode);
  extern int posix_acl_default_exists(struct inode *inode);
  #else
  static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
  {
  	return NULL;
  }
  # define xfs_set_acl					NULL
  # define posix_acl_access_exists(inode)			0
  # define posix_acl_default_exists(inode)		0
  #endif /* CONFIG_XFS_POSIX_ACL */
  #endif	/* __XFS_ACL_H__ */