release/src-rt-6.x/linux/linux-2.6/include/linux/bfs_fs.h

   1 /*
   2  *      include/linux/bfs_fs.h - BFS data structures on disk.
   3  *      Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
   4  */
   5
   6 #ifndef _LINUX_BFS_FS_H
   7 #define _LINUX_BFS_FS_H
   8
   9 #define BFS_BSIZE_BITS          9
  10 #define BFS_BSIZE               (1<<BFS_BSIZE_BITS)
  11
  12 #define BFS_MAGIC               0x1BADFACE
  13 #define BFS_ROOT_INO            2
  14 #define BFS_INODES_PER_BLOCK    8
  15
  16 /* SVR4 vnode type values (bfs_inode->i_vtype) */
  17 #define BFS_VDIR 2L
  18 #define BFS_VREG 1L
  19
  20
  21 /* BFS inode layout on disk */
  22 struct bfs_inode {
  23         __le16 i_ino;
  24         __u16 i_unused;
  25         __le32 i_sblock;
  26         __le32 i_eblock;
  27         __le32 i_eoffset;
  28         __le32 i_vtype;
  29         __le32 i_mode;
  30         __le32 i_uid;
  31         __le32 i_gid;
  32         __le32 i_nlink;
  33         __le32 i_atime;
  34         __le32 i_mtime;
  35         __le32 i_ctime;
  36         __u32 i_padding[4];
  37 };
  38
  39 #define BFS_NAMELEN             14
  40 #define BFS_DIRENT_SIZE         16
  41 #define BFS_DIRS_PER_BLOCK      32
  42
  43 struct bfs_dirent {
  44         __le16 ino;
  45         char name[BFS_NAMELEN];
  46 };
  47
  48 /* BFS superblock layout on disk */
  49 struct bfs_super_block {
  50         __le32 s_magic;
  51         __le32 s_start;
  52         __le32 s_end;
  53         __le32 s_from;
  54         __le32 s_to;
  55         __s32 s_bfrom;
  56         __s32 s_bto;
  57         char  s_fsname[6];
  58         char  s_volume[6];
  59         __u32 s_padding[118];
  60 };
  61
  62
  63 #define BFS_OFF2INO(offset) \
  64         ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
  65
  66 #define BFS_INO2OFF(ino) \
  67         ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
  68 #define BFS_NZFILESIZE(ip) \
  69         ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
  70
  71 #define BFS_FILESIZE(ip) \
  72         ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
  73
  74 #define BFS_FILEBLOCKS(ip) \
  75         ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
  76 #define BFS_UNCLEAN(bfs_sb, sb) \
  77         ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))
  78
  79
  80 #endif  /* _LINUX_BFS_FS_H */