LXR linux/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#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 */
  23struct 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
  44struct bfs_dirent {
  45        __le16 ino;
  46        char name[BFS_NAMELEN];
  47};
  48
  49/* BFS superblock layout on disk */
  50struct 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 */
  82