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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 Tigran Aivazian <tigran@veritas.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 */ |