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/include/linux/bfs_fs.h

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C Header | 81 lines | 58 code | 16 blank | 7 comment | 6 complexity | a299c041cc8cf91dc9898ac033a344b3 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 1/*
 2 *	include/linux/bfs_fs.h - BFS data structures on disk.
 3 *	Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
 4 */
 5
 6#ifndef _LINUX_BFS_FS_H
 7#define _LINUX_BFS_FS_H
 8
 9#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 */
23struct 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
44struct bfs_dirent {
45	__le16 ino;
46	char name[BFS_NAMELEN];
47};
48
49/* BFS superblock layout on disk */
50struct 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 */