1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 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 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 */ 42 }; 43 44 enum slotstatus { 45 NONE, 46 COMPACT, 47 FOUND 48 }; 49 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 */ 56 }; 57 58 /* 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 62 * file_type field. 63 */ 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 */ 71 }; 72 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) */ 79 }; 80 81 #define EXT2_FT_DIR_CSUM 0xDE 82 83 #define EXT2_DIRENT_TAIL(data, blocksize) \ 84 ((struct ext2fs_direct_tail *)(((char *)(data)) + \ 85 (blocksize) - sizeof(struct ext2fs_direct_tail))) 86 87 /* 88 * Maximal count of links to a file 89 */ 90 #define EXT4_LINK_MAX 65000 91 92 /* 93 * Ext2 directory file types. Only the low 3 bits are used. The 94 * other bits are reserved for now. 95 */ 96 #define EXT2_FT_UNKNOWN 0 97 #define EXT2_FT_REG_FILE 1 98 #define EXT2_FT_DIR 2 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 8 105 106 /* 107 * EXT2_DIR_PAD defines the directory entries boundaries 108 * 109 * NOTE: It must be a multiple of 4 110 */ 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) & \ 114 ~EXT2_DIR_ROUND) 115 #endif /* !_FS_EXT2FS_EXT2_DIR_H_ */ 116