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1da177e4 LT |
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 | #endif /* _LINUX_BFS_FS_H */ |