2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2009 Aditya Sarawgi
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #ifndef _FS_EXT2FS_EXT2_DIR_H_
32 #define _FS_EXT2FS_EXT2_DIR_H_
35 * Structure of a directory entry
37 #define EXT2FS_MAXNAMLEN 255
39 struct ext2fs_direct {
40 uint32_t e2d_ino; /* inode number of entry */
41 uint16_t e2d_reclen; /* length of this record */
42 uint16_t e2d_namlen; /* length of string in e2d_name */
43 char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
52 struct ext2fs_searchslot {
53 enum slotstatus slotstatus;
54 doff_t slotoffset; /* offset of area with free space */
55 int slotsize; /* size of area at slotoffset */
56 int slotfreespace; /* amount of space free in slot */
57 int slotneeded; /* sizeof the entry we are seeking */
61 * The new version of the directory entry. Since EXT2 structures are
62 * stored in intel byte order, and the name_len field could never be
63 * bigger than 255 chars, it's safe to reclaim the extra byte for the
66 struct ext2fs_direct_2 {
67 uint32_t e2d_ino; /* inode number of entry */
68 uint16_t e2d_reclen; /* length of this record */
69 uint8_t e2d_namlen; /* length of string in e2d_name */
70 uint8_t e2d_type; /* file type */
71 char e2d_name[EXT2FS_MAXNAMLEN]; /* name with
72 * length<=EXT2FS_MAXNAMLEN */
75 struct ext2fs_direct_tail {
76 uint32_t e2dt_reserved_zero1; /* pretend to be unused */
77 uint16_t e2dt_rec_len; /* 12 */
78 uint8_t e2dt_reserved_zero2; /* zero name length */
79 uint8_t e2dt_reserved_ft; /* 0xDE, fake file type */
80 uint32_t e2dt_checksum; /* crc32c(uuid+inum+dirblock) */
83 #define EXT2_FT_DIR_CSUM 0xDE
85 #define EXT2_DIRENT_TAIL(data, blocksize) \
86 ((struct ext2fs_direct_tail *)(((char *)(data)) + \
87 (blocksize) - sizeof(struct ext2fs_direct_tail)))
90 * Maximal count of links to a file
92 #define EXT4_LINK_MAX 65000
95 * Ext2 directory file types. Only the low 3 bits are used. The
96 * other bits are reserved for now.
98 #define EXT2_FT_UNKNOWN 0
99 #define EXT2_FT_REG_FILE 1
100 #define EXT2_FT_DIR 2
101 #define EXT2_FT_CHRDEV 3
102 #define EXT2_FT_BLKDEV 4
103 #define EXT2_FT_FIFO 5
104 #define EXT2_FT_SOCK 6
105 #define EXT2_FT_SYMLINK 7
106 #define EXT2_FT_MAX 8
109 * EXT2_DIR_PAD defines the directory entries boundaries
111 * NOTE: It must be a multiple of 4
113 #define EXT2_DIR_PAD 4
114 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
115 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
117 #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */