2 * SPDX-License-Identifier: BSD-2-Clause
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
29 #ifndef _FS_EXT2FS_EXT2_DIR_H_
30 #define _FS_EXT2FS_EXT2_DIR_H_
33 * Structure of a directory entry
35 #define EXT2FS_MAXNAMLEN 255
37 struct 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 */
50 struct ext2fs_searchslot {
51 enum slotstatus slotstatus;
52 doff_t slotoffset; /* offset of area with free space */
53 int slotsize; /* size of area at slotoffset */
54 int slotfreespace; /* amount of space free in slot */
55 int slotneeded; /* sizeof the entry we are seeking */
59 * The new version of the directory entry. Since EXT2 structures are
60 * stored in intel byte order, and the name_len field could never be
61 * bigger than 255 chars, it's safe to reclaim the extra byte for the
64 struct ext2fs_direct_2 {
65 uint32_t e2d_ino; /* inode number of entry */
66 uint16_t e2d_reclen; /* length of this record */
67 uint8_t e2d_namlen; /* length of string in e2d_name */
68 uint8_t e2d_type; /* file type */
69 char e2d_name[EXT2FS_MAXNAMLEN]; /* name with
70 * length<=EXT2FS_MAXNAMLEN */
73 struct ext2fs_direct_tail {
74 uint32_t e2dt_reserved_zero1; /* pretend to be unused */
75 uint16_t e2dt_rec_len; /* 12 */
76 uint8_t e2dt_reserved_zero2; /* zero name length */
77 uint8_t e2dt_reserved_ft; /* 0xDE, fake file type */
78 uint32_t e2dt_checksum; /* crc32c(uuid+inum+dirblock) */
81 #define EXT2_FT_DIR_CSUM 0xDE
83 #define EXT2_DIRENT_TAIL(data, blocksize) \
84 ((struct ext2fs_direct_tail *)(((char *)(data)) + \
85 (blocksize) - sizeof(struct ext2fs_direct_tail)))
88 * Maximal count of links to a file
90 #define EXT4_LINK_MAX 65000
93 * Ext2 directory file types. Only the low 3 bits are used. The
94 * other bits are reserved for now.
96 #define EXT2_FT_UNKNOWN 0
97 #define EXT2_FT_REG_FILE 1
99 #define EXT2_FT_CHRDEV 3
100 #define EXT2_FT_BLKDEV 4
101 #define EXT2_FT_FIFO 5
102 #define EXT2_FT_SOCK 6
103 #define EXT2_FT_SYMLINK 7
104 #define EXT2_FT_MAX 8
107 * EXT2_DIR_PAD defines the directory entries boundaries
109 * NOTE: It must be a multiple of 4
111 #define EXT2_DIR_PAD 4
112 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
113 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
115 #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */