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