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 2L
18#define BFS_VREG 1L
19
20
21/* BFS inode layout on disk */
22struct bfs_inode {
23	__le16 i_ino;
24	__u16 i_unused;
25	__le32 i_sblock;
26	__le32 i_eblock;
27	__le32 i_eoffset;
28	__le32 i_vtype;
29	__le32 i_mode;
30	__le32 i_uid;
31	__le32 i_gid;
32	__le32 i_nlink;
33	__le32 i_atime;
34	__le32 i_mtime;
35	__le32 i_ctime;
36	__u32 i_padding[4];
37};
38
39#define BFS_NAMELEN		14
40#define BFS_DIRENT_SIZE		16
41#define BFS_DIRS_PER_BLOCK	32
42
43struct bfs_dirent {
44	__le16 ino;
45	char name[BFS_NAMELEN];
46};
47
48/* BFS superblock layout on disk */
49struct bfs_super_block {
50	__le32 s_magic;
51	__le32 s_start;
52	__le32 s_end;
53	__le32 s_from;
54	__le32 s_to;
55	__s32 s_bfrom;
56	__s32 s_bto;
57	char  s_fsname[6];
58	char  s_volume[6];
59	__u32 s_padding[118];
60};
61
62
63#define BFS_OFF2INO(offset) \
64        ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
65
66#define BFS_INO2OFF(ino) \
67	((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
68#define BFS_NZFILESIZE(ip) \
69        ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
70
71#define BFS_FILESIZE(ip) \
72        ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
73
74#define BFS_FILEBLOCKS(ip) \
75        ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
76#define BFS_UNCLEAN(bfs_sb, sb)	\
77	((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))
78
79
80#endif	/* _LINUX_BFS_FS_H */
81