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