1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | /* |
3 | * include/linux/bfs_fs.h - BFS data structures on disk. |
4 | * Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com> |
5 | */ |
6 | |
7 | #ifndef _LINUX_BFS_FS_H |
8 | #define _LINUX_BFS_FS_H |
9 | |
10 | #include <linux/types.h> |
11 | |
12 | #define BFS_BSIZE_BITS 9 |
13 | #define BFS_BSIZE (1<<BFS_BSIZE_BITS) |
14 | |
15 | #define BFS_MAGIC 0x1BADFACE |
16 | #define BFS_ROOT_INO 2 |
17 | #define BFS_INODES_PER_BLOCK 8 |
18 | |
19 | /* SVR4 vnode type values (bfs_inode->i_vtype) */ |
20 | #define BFS_VDIR 2L |
21 | #define BFS_VREG 1L |
22 | |
23 | /* BFS inode layout on disk */ |
24 | struct bfs_inode { |
25 | __le16 i_ino; |
26 | __u16 i_unused; |
27 | __le32 i_sblock; |
28 | __le32 i_eblock; |
29 | __le32 i_eoffset; |
30 | __le32 i_vtype; |
31 | __le32 i_mode; |
32 | __le32 i_uid; |
33 | __le32 i_gid; |
34 | __le32 i_nlink; |
35 | __le32 i_atime; |
36 | __le32 i_mtime; |
37 | __le32 i_ctime; |
38 | __u32 i_padding[4]; |
39 | }; |
40 | |
41 | #define BFS_NAMELEN 14 |
42 | #define BFS_DIRENT_SIZE 16 |
43 | #define BFS_DIRS_PER_BLOCK 32 |
44 | |
45 | struct bfs_dirent { |
46 | __le16 ino; |
47 | char name[BFS_NAMELEN]; |
48 | }; |
49 | |
50 | /* BFS superblock layout on disk */ |
51 | struct bfs_super_block { |
52 | __le32 s_magic; |
53 | __le32 s_start; |
54 | __le32 s_end; |
55 | __le32 s_from; |
56 | __le32 s_to; |
57 | __s32 s_bfrom; |
58 | __s32 s_bto; |
59 | char s_fsname[6]; |
60 | char s_volume[6]; |
61 | __u32 s_padding[118]; |
62 | }; |
63 | |
64 | |
65 | #define BFS_OFF2INO(offset) \ |
66 | ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO) |
67 | |
68 | #define BFS_INO2OFF(ino) \ |
69 | ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE) |
70 | #define BFS_NZFILESIZE(ip) \ |
71 | ((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE) |
72 | |
73 | #define BFS_FILESIZE(ip) \ |
74 | ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip)) |
75 | |
76 | #define BFS_FILEBLOCKS(ip) \ |
77 | ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock)) |
78 | #define BFS_UNCLEAN(bfs_sb, sb) \ |
79 | ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY)) |
80 | |
81 | |
82 | #endif /* _LINUX_BFS_FS_H */ |
83 | |