ext2fs_dir.h revision 1.7
1 /* $NetBSD: ext2fs_dir.h,v 1.7 2003/10/05 17:48:49 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)dir.h 8.4 (Berkeley) 8/10/94 37 * Modified for ext2fs by Manuel Bouyer. 38 */ 39 40 /* 41 * Copyright (c) 1997 Manuel Bouyer. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by Manuel Bouyer. 54 * 4. The name of the author may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)dir.h 8.4 (Berkeley) 8/10/94 70 * Modified for ext2fs by Manuel Bouyer. 71 */ 72 73 #ifndef _UFS_EXT2FS_EXT2FS_DIR_H_ 74 #define _UFS_EXT2FS_EXT2FS_DIR_H_ 75 76 /* 77 * Theoretically, directories can be more than 2Gb in length, however, in 78 * practice this seems unlikely. So, we define the type doff_t as a 32-bit 79 * quantity to keep down the cost of doing lookup on a 32-bit machine. 80 */ 81 #define doff_t int32_t 82 #define EXT2FS_MAXDIRSIZE (0x7fffffff) 83 84 /* 85 * A directory consists of some number of blocks of e2fs_bsize bytes. 86 * 87 * Each block contains some number of directory entry 88 * structures, which are of variable length. Each directory entry has 89 * a struct direct at the front of it, containing its inode number, 90 * the length of the entry, and the length of the name contained in 91 * the entry. These are followed by the name padded to a 4 byte boundary 92 * with null bytes. All names are guaranteed null terminated. 93 * The maximum length of a name in a directory is EXT2FS_MAXNAMLEN. 94 * 95 * The macro EXT2FS_DIRSIZ(fmt, dp) gives the amount of space required to 96 * represent a directory entry. Free space in a directory is represented by 97 * entries which have dp->e2d_reclen > DIRSIZ(fmt, dp). All d2fs_bsize bytes 98 * in a directory block are claimed by the directory entries. This 99 * usually results in the last entry in a directory having a large 100 * dp->e2d_reclen. When entries are deleted from a directory, the 101 * space is returned to the previous entry in the same directory 102 * block by increasing its dp->e2d_reclen. If the first entry of 103 * a directory block is free, then its dp->e2d_ino is set to 0. 104 * Entries other than the first in a directory do not normally have 105 * dp->e2d_ino set to 0. 106 * Ext2 rev 0 has a 16 bits e2d_namlen. For Ext2 vev 1 this has been split 107 * into a 8 bits e2d_namlen and 8 bits e2d_type (looks like ffs, isnt't it ? :) 108 * It's safe to use this for rev 0 as well because all ext2 are little-endian. 109 */ 110 111 #define EXT2FS_MAXNAMLEN 255 112 113 struct ext2fs_direct { 114 u_int32_t e2d_ino; /* inode number of entry */ 115 u_int16_t e2d_reclen; /* length of this record */ 116 u_int8_t e2d_namlen; /* length of string in d_name */ 117 u_int8_t e2d_type; /* file type */ 118 char e2d_name[EXT2FS_MAXNAMLEN];/* name with length <= EXT2FS_MAXNAMLEN */ 119 }; 120 121 /* Ext2 directory file types (not the same as FFS. Sigh. */ 122 #define EXT2_FT_UNKNOWN 0 123 #define EXT2_FT_REG_FILE 1 124 #define EXT2_FT_DIR 2 125 #define EXT2_FT_CHRDEV 3 126 #define EXT2_FT_BLKDEV 4 127 #define EXT2_FT_FIFO 5 128 #define EXT2_FT_SOCK 6 129 #define EXT2_FT_SYMLINK 7 130 131 #define EXT2_FT_MAX 8 132 133 #define E2IFTODT(mode) (((mode) & 0170000) >> 12) 134 135 static __inline__ u_int8_t inot2ext2dt __P((u_int16_t)) 136 __attribute__((__unused__)); 137 static __inline__ u_int8_t 138 inot2ext2dt(type) 139 u_int16_t type; 140 { 141 switch(type) { 142 case E2IFTODT(EXT2_IFIFO): 143 return EXT2_FT_FIFO; 144 case E2IFTODT(EXT2_IFCHR): 145 return EXT2_FT_CHRDEV; 146 case E2IFTODT(EXT2_IFDIR): 147 return EXT2_FT_DIR; 148 case E2IFTODT(EXT2_IFBLK): 149 return EXT2_FT_BLKDEV; 150 case E2IFTODT(EXT2_IFREG): 151 return EXT2_FT_REG_FILE; 152 case E2IFTODT(EXT2_IFLNK): 153 return EXT2_FT_SYMLINK; 154 case E2IFTODT(EXT2_IFSOCK): 155 return EXT2_FT_SOCK; 156 default: 157 return 0; 158 } 159 } 160 161 /* 162 * The EXT2FS_DIRSIZ macro gives the minimum record length which will hold 163 * the directory entryfor a name len "len" (without the terminating null byte). 164 * This requires the amount of space in struct direct 165 * without the d_name field, plus enough space for the name without a 166 * terminating null byte, rounded up to a 4 byte boundary. 167 */ 168 #define EXT2FS_DIRSIZ(len) \ 169 (( 8 + len + 3) &~ 3) 170 171 /* 172 * Template for manipulating directories. Should use struct direct's, 173 * but the name field is EXT2FS_MAXNAMLEN - 1, and this just won't do. 174 */ 175 struct ext2fs_dirtemplate { 176 u_int32_t dot_ino; 177 int16_t dot_reclen; 178 u_int8_t dot_namlen; 179 u_int8_t dot_type; 180 char dot_name[4]; /* must be multiple of 4 */ 181 u_int32_t dotdot_ino; 182 int16_t dotdot_reclen; 183 u_int8_t dotdot_namlen; 184 u_int8_t dotdot_type; 185 char dotdot_name[4]; /* ditto */ 186 }; 187 188 #endif /* !_UFS_EXT2FS_EXT2FS_DIR_H_ */ 189
Indexes created Tue Sep 30 20:09:53 GMT 2025