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