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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) */ | |
fac92bec AS |
17 | #define BFS_VDIR 2L |
18 | #define BFS_VREG 1L | |
19 | ||
1da177e4 LT |
20 | |
21 | /* BFS inode layout on disk */ | |
22 | struct bfs_inode { | |
ce0fe7e7 | 23 | __le16 i_ino; |
1da177e4 | 24 | __u16 i_unused; |
ce0fe7e7 AD |
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; | |
1da177e4 LT |
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 | ||
43 | struct bfs_dirent { | |
ce0fe7e7 | 44 | __le16 ino; |
1da177e4 LT |
45 | char name[BFS_NAMELEN]; |
46 | }; | |
47 | ||
48 | /* BFS superblock layout on disk */ | |
49 | struct bfs_super_block { | |
ce0fe7e7 AD |
50 | __le32 s_magic; |
51 | __le32 s_start; | |
52 | __le32 s_end; | |
53 | __le32 s_from; | |
54 | __le32 s_to; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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) | |
fac92bec | 68 | #define BFS_NZFILESIZE(ip) \ |
ce0fe7e7 | 69 | ((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE) |
fac92bec AS |
70 | |
71 | #define BFS_FILESIZE(ip) \ | |
72 | ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip)) | |
1da177e4 | 73 | |
fac92bec | 74 | #define BFS_FILEBLOCKS(ip) \ |
ce0fe7e7 | 75 | ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock)) |
1da177e4 | 76 | #define BFS_UNCLEAN(bfs_sb, sb) \ |
ce0fe7e7 | 77 | ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY)) |
fac92bec | 78 | |
1da177e4 LT |
79 | |
80 | #endif /* _LINUX_BFS_FS_H */ |