Annotation of src/sys/ufs/ext2fs/ext2fs_dir.h, Revision 1.19
1.19 ! riastrad 1: /* $NetBSD: ext2fs_dir.h,v 1.18 2009/10/19 18:41:17 bouyer Exp $ */
1.1 bouyer 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.
1.6 agc 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.
1.1 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: *
1.8 bouyer 52: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
53: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
54: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
55: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
56: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
57: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
58: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
59: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
60: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
61: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1 bouyer 62: *
63: * @(#)dir.h 8.4 (Berkeley) 8/10/94
64: * Modified for ext2fs by Manuel Bouyer.
65: */
66:
1.5 matt 67: #ifndef _UFS_EXT2FS_EXT2FS_DIR_H_
68: #define _UFS_EXT2FS_EXT2FS_DIR_H_
1.1 bouyer 69:
1.19 ! riastrad 70: #include <ufs/ext2fs/ext2fs_dinode.h>
! 71:
1.1 bouyer 72: /*
73: * Theoretically, directories can be more than 2Gb in length, however, in
74: * practice this seems unlikely. So, we define the type doff_t as a 32-bit
75: * quantity to keep down the cost of doing lookup on a 32-bit machine.
1.2 christos 76: */
1.14 tsutsui 77: #define doff_t int32_t
1.17 tsutsui 78: #define EXT2FS_MAXDIRSIZE INT32_MAX
1.1 bouyer 79:
80: /*
81: * A directory consists of some number of blocks of e2fs_bsize bytes.
82: *
83: * Each block contains some number of directory entry
84: * structures, which are of variable length. Each directory entry has
85: * a struct direct at the front of it, containing its inode number,
86: * the length of the entry, and the length of the name contained in
87: * the entry. These are followed by the name padded to a 4 byte boundary
88: * with null bytes. All names are guaranteed null terminated.
89: * The maximum length of a name in a directory is EXT2FS_MAXNAMLEN.
90: *
91: * The macro EXT2FS_DIRSIZ(fmt, dp) gives the amount of space required to
92: * represent a directory entry. Free space in a directory is represented by
93: * entries which have dp->e2d_reclen > DIRSIZ(fmt, dp). All d2fs_bsize bytes
94: * in a directory block are claimed by the directory entries. This
95: * usually results in the last entry in a directory having a large
96: * dp->e2d_reclen. When entries are deleted from a directory, the
97: * space is returned to the previous entry in the same directory
98: * block by increasing its dp->e2d_reclen. If the first entry of
99: * a directory block is free, then its dp->e2d_ino is set to 0.
100: * Entries other than the first in a directory do not normally have
101: * dp->e2d_ino set to 0.
1.3 bouyer 102: * Ext2 rev 0 has a 16 bits e2d_namlen. For Ext2 vev 1 this has been split
103: * into a 8 bits e2d_namlen and 8 bits e2d_type (looks like ffs, isnt't it ? :)
104: * It's safe to use this for rev 0 as well because all ext2 are little-endian.
1.1 bouyer 105: */
106:
107: #define EXT2FS_MAXNAMLEN 255
108:
109: struct ext2fs_direct {
1.16 tsutsui 110: uint32_t e2d_ino; /* inode number of entry */
111: uint16_t e2d_reclen; /* length of this record */
112: uint8_t e2d_namlen; /* length of string in d_name */
113: uint8_t e2d_type; /* file type */
1.14 tsutsui 114: char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
1.1 bouyer 115: };
1.4 bouyer 116:
1.17 tsutsui 117: /* Ext2 directory file types (not the same as FFS. Sigh.) */
1.4 bouyer 118: #define EXT2_FT_UNKNOWN 0
1.9 perry 119: #define EXT2_FT_REG_FILE 1
1.4 bouyer 120: #define EXT2_FT_DIR 2
121: #define EXT2_FT_CHRDEV 3
122: #define EXT2_FT_BLKDEV 4
123: #define EXT2_FT_FIFO 5
124: #define EXT2_FT_SOCK 6
125: #define EXT2_FT_SYMLINK 7
126:
127: #define EXT2_FT_MAX 8
128:
129: #define E2IFTODT(mode) (((mode) & 0170000) >> 12)
130:
1.16 tsutsui 131: static __inline uint8_t inot2ext2dt(uint16_t) __unused;
132: static __inline uint8_t
133: inot2ext2dt(uint16_t type)
1.4 bouyer 134: {
1.17 tsutsui 135:
136: switch (type) {
1.4 bouyer 137: case E2IFTODT(EXT2_IFIFO):
138: return EXT2_FT_FIFO;
139: case E2IFTODT(EXT2_IFCHR):
140: return EXT2_FT_CHRDEV;
141: case E2IFTODT(EXT2_IFDIR):
142: return EXT2_FT_DIR;
143: case E2IFTODT(EXT2_IFBLK):
144: return EXT2_FT_BLKDEV;
145: case E2IFTODT(EXT2_IFREG):
146: return EXT2_FT_REG_FILE;
147: case E2IFTODT(EXT2_IFLNK):
148: return EXT2_FT_SYMLINK;
149: case E2IFTODT(EXT2_IFSOCK):
150: return EXT2_FT_SOCK;
151: default:
152: return 0;
153: }
154: }
1.1 bouyer 155:
156: /*
157: * The EXT2FS_DIRSIZ macro gives the minimum record length which will hold
158: * the directory entryfor a name len "len" (without the terminating null byte).
159: * This requires the amount of space in struct direct
160: * without the d_name field, plus enough space for the name without a
161: * terminating null byte, rounded up to a 4 byte boundary.
162: */
1.17 tsutsui 163: #define EXT2FS_DIRSIZ(len) roundup2(8 + len, 4)
1.1 bouyer 164:
165: /*
166: * Template for manipulating directories. Should use struct direct's,
167: * but the name field is EXT2FS_MAXNAMLEN - 1, and this just won't do.
168: */
169: struct ext2fs_dirtemplate {
1.16 tsutsui 170: uint32_t dot_ino;
1.1 bouyer 171: int16_t dot_reclen;
1.16 tsutsui 172: uint8_t dot_namlen;
173: uint8_t dot_type;
1.1 bouyer 174: char dot_name[4]; /* must be multiple of 4 */
1.16 tsutsui 175: uint32_t dotdot_ino;
1.1 bouyer 176: int16_t dotdot_reclen;
1.16 tsutsui 177: uint8_t dotdot_namlen;
178: uint8_t dotdot_type;
1.1 bouyer 179: char dotdot_name[4]; /* ditto */
180: };
181:
1.5 matt 182: #endif /* !_UFS_EXT2FS_EXT2FS_DIR_H_ */
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