efs_dir.h revision c559cd81139f97cecad1ad91a0b2e25a5936d531 
1/*
2 * efs_dir.h
3 *
4 * Copyright (c) 1999 Al Smith
5 */
6
7#ifndef __EFS_DIR_H__
8#define __EFS_DIR_H__
9
10#define EFS_DIRBSIZE_BITS	EFS_BLOCKSIZE_BITS
11#define EFS_DIRBSIZE		(1 << EFS_DIRBSIZE_BITS)
12
13struct efs_dentry {
14	__be32		inode;
15	unsigned char	namelen;
16	char		name[3];
17};
18
19#define EFS_DENTSIZE	(sizeof(struct efs_dentry) - 3 + 1)
20#define EFS_MAXNAMELEN  ((1 << (sizeof(char) * 8)) - 1)
21
22#define EFS_DIRBLK_HEADERSIZE	4
23#define EFS_DIRBLK_MAGIC	0xbeef	/* moo */
24
25struct efs_dir {
26	__be16	magic;
27	unsigned char	firstused;
28	unsigned char	slots;
29
30	unsigned char	space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
31};
32
33#define EFS_MAXENTS \
34	((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
35	 (EFS_DENTSIZE + sizeof(char)))
36
37#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
38
39#define EFS_REALOFF(offset) ((offset << 1))
40
41#endif /* __EFS_DIR_H__ */
42
43