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linux
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 */