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 */
24struct 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
45struct bfs_dirent {
46	__le16 ino;
47	char name[BFS_NAMELEN];
48};
49
50/* BFS superblock layout on disk */
51struct 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