root/include/uapi/linux/bfs_fs.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  *      include/linux/bfs_fs.h - BFS data structures on disk.
   4  *      Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
   5  */
   6 
   7 #ifndef _LINUX_BFS_FS_H
   8 #define _LINUX_BFS_FS_H
   9 
  10 #include <linux/types.h>
  11 
  12 #define BFS_BSIZE_BITS          9
  13 #define BFS_BSIZE               (1<<BFS_BSIZE_BITS)
  14 
  15 #define BFS_MAGIC               0x1BADFACE
  16 #define BFS_ROOT_INO            2
  17 #define BFS_INODES_PER_BLOCK    8
  18 
  19 /* SVR4 vnode type values (bfs_inode->i_vtype) */
  20 #define BFS_VDIR 2L
  21 #define BFS_VREG 1L
  22 
  23 /* BFS inode layout on disk */
  24 struct bfs_inode {
  25         __le16 i_ino;
  26         __u16 i_unused;
  27         __le32 i_sblock;
  28         __le32 i_eblock;
  29         __le32 i_eoffset;
  30         __le32 i_vtype;
  31         __le32 i_mode;
  32         __le32 i_uid;
  33         __le32 i_gid;
  34         __le32 i_nlink;
  35         __le32 i_atime;
  36         __le32 i_mtime;
  37         __le32 i_ctime;
  38         __u32 i_padding[4];
  39 };
  40 
  41 #define BFS_NAMELEN             14      
  42 #define BFS_DIRENT_SIZE         16
  43 #define BFS_DIRS_PER_BLOCK      32
  44 
  45 struct bfs_dirent {
  46         __le16 ino;
  47         char name[BFS_NAMELEN];
  48 };
  49 
  50 /* BFS superblock layout on disk */
  51 struct bfs_super_block {
  52         __le32 s_magic;
  53         __le32 s_start;
  54         __le32 s_end;
  55         __le32 s_from;
  56         __le32 s_to;
  57         __s32 s_bfrom;
  58         __s32 s_bto;
  59         char  s_fsname[6];
  60         char  s_volume[6];
  61         __u32 s_padding[118];
  62 };
  63 
  64 
  65 #define BFS_OFF2INO(offset) \
  66         ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
  67 
  68 #define BFS_INO2OFF(ino) \
  69         ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
  70 #define BFS_NZFILESIZE(ip) \
  71         ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
  72 
  73 #define BFS_FILESIZE(ip) \
  74         ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
  75 
  76 #define BFS_FILEBLOCKS(ip) \
  77         ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
  78 #define BFS_UNCLEAN(bfs_sb, sb) \
  79         ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY))
  80 
  81 
  82 #endif  /* _LINUX_BFS_FS_H */