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 */
21 struct 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
42 struct bfs_dirent {
43 __u16 ino;
44 char name[BFS_NAMELEN];
45 };
46
47 /* BFS superblock layout on disk */
48 struct 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 #ifdef __KERNEL__
80
81 /* file.c */
82 extern struct inode_operations bfs_file_inops;
83 extern struct file_operations bfs_file_operations;
84 extern struct address_space_operations bfs_aops;
85
86 /* dir.c */
87 extern struct inode_operations bfs_dir_inops;
88 extern struct file_operations bfs_dir_operations;
89
90 #endif /* __KERNEL__ */
91 #endif /* _LINUX_BFS_FS_H */
92
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