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01: /*
02:  *      include/linux/bfs_fs.h - BFS data structures on disk.
03:  *      Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
04:  */
05: 
06: #ifndef _LINUX_BFS_FS_H
07: #define _LINUX_BFS_FS_H
08: 
09: #include <linux/types.h>
10: 
11: #define BFS_BSIZE_BITS          9
12: #define BFS_BSIZE               (1<<BFS_BSIZE_BITS)
13: 
14: #define BFS_MAGIC               0x1BADFACE
15: #define BFS_ROOT_INO            2
16: #define BFS_INODES_PER_BLOCK    8
17: 
18: /* SVR4 vnode type values (bfs_inode->i_vtype) */
19: #define BFS_VDIR 2L
20: #define BFS_VREG 1L
21: 
22: /* BFS inode layout on disk */
23: struct bfs_inode {
24:         __le16 i_ino;
25:         __u16 i_unused;
26:         __le32 i_sblock;
27:         __le32 i_eblock;
28:         __le32 i_eoffset;
29:         __le32 i_vtype;
30:         __le32 i_mode;
31:         __le32 i_uid;
32:         __le32 i_gid;
33:         __le32 i_nlink;
34:         __le32 i_atime;
35:         __le32 i_mtime;
36:         __le32 i_ctime;
37:         __u32 i_padding[4];
38: };
39: 
40: #define BFS_NAMELEN             14      
41: #define BFS_DIRENT_SIZE         16
42: #define BFS_DIRS_PER_BLOCK      32
43: 
44: struct bfs_dirent {
45:         __le16 ino;
46:         char name[BFS_NAMELEN];
47: };
48: 
49: /* BFS superblock layout on disk */
50: struct bfs_super_block {
51:         __le32 s_magic;
52:         __le32 s_start;
53:         __le32 s_end;
54:         __le32 s_from;
55:         __le32 s_to;
56:         __s32 s_bfrom;
57:         __s32 s_bto;
58:         char  s_fsname[6];
59:         char  s_volume[6];
60:         __u32 s_padding[118];
61: };
62: 
63: 
64: #define BFS_OFF2INO(offset) \
65:         ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
66: 
67: #define BFS_INO2OFF(ino) \
68:         ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
69: #define BFS_NZFILESIZE(ip) \
70:         ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
71: 
72: #define BFS_FILESIZE(ip) \
73:         ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
74: 
75: #define BFS_FILEBLOCKS(ip) \
76:         ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
77: #define BFS_UNCLEAN(bfs_sb, sb) \
78:         ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))
79: 
80: 
81: #endif  /* _LINUX_BFS_FS_H */
82: 

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