LXR linux-bk/include/linux/bfs

   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 */
  21struct 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
  42struct bfs_dirent {
  43        __u16 ino;
  44        char name[BFS_NAMELEN];
  45};
  46
  47/* BFS superblock layout on disk */
  48struct 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 */
  80