1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009 Aditya Sarawgi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _FS_EXT2FS_EXT2_DIR_H_ 32 #define _FS_EXT2FS_EXT2_DIR_H_ 33 34 /* 35 * Structure of a directory entry 36 */ 37 #define EXT2FS_MAXNAMLEN 255 38 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 */ 44 }; 45 46 enum slotstatus { 47 NONE, 48 COMPACT, 49 FOUND 50 }; 51 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 */ 58 }; 59 60 /* 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 64 * file_type field. 65 */ 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 */ 73 }; 74 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) */ 81 }; 82 83 #define EXT2_FT_DIR_CSUM 0xDE 84 85 #define EXT2_DIRENT_TAIL(data, blocksize) \ 86 ((struct ext2fs_direct_tail *)(((char *)(data)) + \ 87 (blocksize) - sizeof(struct ext2fs_direct_tail))) 88 89 /* 90 * Maximal count of links to a file 91 */ 92 #define EXT4_LINK_MAX 65000 93 94 /* 95 * Ext2 directory file types. Only the low 3 bits are used. The 96 * other bits are reserved for now. 97 */ 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 8 107 108 /* 109 * EXT2_DIR_PAD defines the directory entries boundaries 110 * 111 * NOTE: It must be a multiple of 4 112 */ 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) & \ 116 ~EXT2_DIR_ROUND) 117 #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */ 118