/*
   *	include/linux/bfs_fs.h - BFS data structures on disk.
   *	Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
   */
  
  #ifndef _LINUX_BFS_FS_H
  #define _LINUX_BFS_FS_H

  #include <linux/types.h>

  #define BFS_BSIZE_BITS		9
  #define BFS_BSIZE		(1<<BFS_BSIZE_BITS)
  
  #define BFS_MAGIC		0x1BADFACE
  #define BFS_ROOT_INO		2
  #define BFS_INODES_PER_BLOCK	8
  
  /* SVR4 vnode type values (bfs_inode->i_vtype) */

  #define BFS_VDIR 2L
  #define BFS_VREG 1L

  /* BFS inode layout on disk */
  struct bfs_inode {

  	__le16 i_ino;

  	__u16 i_unused;

  	__le32 i_sblock;
  	__le32 i_eblock;
  	__le32 i_eoffset;
  	__le32 i_vtype;
  	__le32 i_mode;
  	__le32 i_uid;
  	__le32 i_gid;
  	__le32 i_nlink;
  	__le32 i_atime;
  	__le32 i_mtime;
  	__le32 i_ctime;

  	__u32 i_padding[4];
  };
  
  #define BFS_NAMELEN		14	
  #define BFS_DIRENT_SIZE		16
  #define BFS_DIRS_PER_BLOCK	32
  
  struct bfs_dirent {

  	__le16 ino;

  	char name[BFS_NAMELEN];
  };
  
  /* BFS superblock layout on disk */
  struct bfs_super_block {

  	__le32 s_magic;
  	__le32 s_start;
  	__le32 s_end;
  	__le32 s_from;
  	__le32 s_to;

  	__s32 s_bfrom;
  	__s32 s_bto;
  	char  s_fsname[6];
  	char  s_volume[6];
  	__u32 s_padding[118];
  };

  
  #define BFS_OFF2INO(offset) \
          ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
  
  #define BFS_INO2OFF(ino) \
  	((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)

  #define BFS_NZFILESIZE(ip) \

          ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)

  
  #define BFS_FILESIZE(ip) \
          ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))

  #define BFS_FILEBLOCKS(ip) \

          ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))

  #define BFS_UNCLEAN(bfs_sb, sb)	\

  	((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))

  
  #endif	/* _LINUX_BFS_FS_H */