xref: /openbmc/linux/include/uapi/linux/bfs_fs.h (revision d1877155)
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