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
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