ext2_dir.h revision 281841 
1/*-
2 * Copyright (c) 2009 Aditya Sarawgi
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/10/sys/fs/ext2fs/ext2_dir.h 281841 2015-04-22 00:38:11Z pfg $
27 */
28
29#ifndef _FS_EXT2FS_EXT2_DIR_H_
30#define	_FS_EXT2FS_EXT2_DIR_H_
31
32/*
33 * Structure of a directory entry
34 */
35#define	EXT2FS_MAXNAMLEN	255
36
37struct	ext2fs_direct {
38	uint32_t e2d_ino;		/* inode number of entry */
39	uint16_t e2d_reclen;		/* length of this record */
40	uint16_t e2d_namlen;		/* length of string in e2d_name */
41	char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
42};
43/*
44 * The new version of the directory entry.  Since EXT2 structures are
45 * stored in intel byte order, and the name_len field could never be
46 * bigger than 255 chars, it's safe to reclaim the extra byte for the
47 * file_type field.
48 */
49struct	ext2fs_direct_2 {
50	uint32_t e2d_ino;		/* inode number of entry */
51	uint16_t e2d_reclen;		/* length of this record */
52	uint8_t e2d_namlen;		/* length of string in e2d_name */
53	uint8_t e2d_type;		/* file type */
54	char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
55};
56
57/*
58 * Maximal count of links to a file
59 */
60#define	EXT2_LINK_MAX	32000
61
62/*
63 * Ext2 directory file types.  Only the low 3 bits are used.  The
64 * other bits are reserved for now.
65 */
66#define	EXT2_FT_UNKNOWN		0
67#define	EXT2_FT_REG_FILE	1
68#define	EXT2_FT_DIR		2
69#define	EXT2_FT_CHRDEV		3
70#define	EXT2_FT_BLKDEV 		4
71#define	EXT2_FT_FIFO		5
72#define	EXT2_FT_SOCK		6
73#define	EXT2_FT_SYMLINK		7
74#define	EXT2_FT_MAX		8
75
76/*
77 * EXT2_DIR_PAD defines the directory entries boundaries
78 *
79 * NOTE: It must be a multiple of 4
80 */
81#define	EXT2_DIR_PAD		 	4
82#define	EXT2_DIR_ROUND			(EXT2_DIR_PAD - 1)
83#define	EXT2_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT2_DIR_ROUND) & \
84					 ~EXT2_DIR_ROUND)
85#endif /* !_FS_EXT2FS_EXT2_DIR_H_ */
86
87