LXR linux/include/uapi/linux/bfs

   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 */
  24struct 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
  45struct bfs_dirent {
  46        __le16 ino;
  47        char name[BFS_NAMELEN];
  48};
  49
  50/* BFS superblock layout on disk */
  51struct 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 */
  83