Annotation of sys/ufs/ext2fs/ext2fs_dir.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ext2fs_dir.h,v 1.7 2003/06/02 23:28:22 millert Exp $ */
2: /* $NetBSD: ext2fs_dir.h,v 1.4 2000/01/28 16:00:23 bouyer Exp $ */
3:
4: /*
5: * Copyright (c) 1997 Manuel Bouyer.
6: * Copyright (c) 1982, 1986, 1989, 1993
7: * The Regents of the University of California. All rights reserved.
8: * (c) UNIX System Laboratories, Inc.
9: * All or some portions of this file are derived from material licensed
10: * to the University of California by American Telephone and Telegraph
11: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
12: * the permission of UNIX System Laboratories, Inc.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: * 3. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * @(#)dir.h 8.4 (Berkeley) 8/10/94
39: * Modified for ext2fs by Manuel Bouyer.
40: */
41:
42: #ifndef _EXT2FS_DIR_H_
43: #define _EXT2FS_DIR_H_
44:
45: /*
46: * Theoretically, directories can be more than 2Gb in length, however, in
47: * practice this seems unlikely. So, we define the type doff_t as a 32-bit
48: * quantity to keep down the cost of doing lookup on a 32-bit machine.
49: */
50: #define doff_t int32_t
51: #define EXT2FS_MAXDIRSIZE (0x7fffffff)
52:
53: /*
54: * A directory consists of some number of blocks of e2fs_bsize bytes.
55: *
56: * Each block contains some number of directory entry
57: * structures, which are of variable length. Each directory entry has
58: * a struct direct at the front of it, containing its inode number,
59: * the length of the entry, and the length of the name contained in
60: * the entry. These are followed by the name padded to a 4 byte boundary
61: * with null bytes. All names are guaranteed null terminated.
62: * The maximum length of a name in a directory is EXT2FS_MAXNAMLEN.
63: *
64: * The macro EXT2FS_DIRSIZ(fmt, dp) gives the amount of space required to
65: * represent a directory entry. Free space in a directory is represented by
66: * entries which have dp->e2d_reclen > DIRSIZ(fmt, dp). All d2fs_bsize bytes
67: * in a directory block are claimed by the directory entries. This
68: * usually results in the last entry in a directory having a large
69: * dp->e2d_reclen. When entries are deleted from a directory, the
70: * space is returned to the previous entry in the same directory
71: * block by increasing its dp->e2d_reclen. If the first entry of
72: * a directory block is free, then its dp->e2d_ino is set to 0.
73: * Entries other than the first in a directory do not normally have
74: * dp->e2d_ino set to 0.
75: * Ext2 rev 0 has a 16 bits e2d_namlen. For Ext2 vev 1 this has been split
76: * into a 8 bits e2d_namlen and 8 bits e2d_type (looks like ffs, isnt't it ? :)
77: * It's safe to use this for rev 0 as well because all ext2 are little-endian.
78: */
79:
80: #define EXT2FS_MAXNAMLEN 255
81:
82: struct ext2fs_direct {
83: u_int32_t e2d_ino; /* inode number of entry */
84: u_int16_t e2d_reclen; /* length of this record */
85: u_int8_t e2d_namlen; /* length of string in d_name */
86: u_int8_t e2d_type; /* file type */
87: char e2d_name[EXT2FS_MAXNAMLEN];/* name with length <= EXT2FS_MAXNAMLEN */
88: };
89:
90: /* Ext2 directory file types (not the same as FFS. Sigh. */
91: #define EXT2_FT_UNKNOWN 0
92: #define EXT2_FT_REG_FILE 1
93: #define EXT2_FT_DIR 2
94: #define EXT2_FT_CHRDEV 3
95: #define EXT2_FT_BLKDEV 4
96: #define EXT2_FT_FIFO 5
97: #define EXT2_FT_SOCK 6
98: #define EXT2_FT_SYMLINK 7
99:
100: #define EXT2_FT_MAX 8
101:
102: #define E2IFTODT(mode) (((mode) & 0170000) >> 12)
103:
104: static __inline__ u_int8_t inot2ext2dt(u_int16_t)
105: __attribute__((__unused__));
106: static __inline__ u_int8_t
107: inot2ext2dt(type)
108: u_int16_t type;
109: {
110: switch(type) {
111: case E2IFTODT(EXT2_IFIFO):
112: return EXT2_FT_FIFO;
113: case E2IFTODT(EXT2_IFCHR):
114: return EXT2_FT_CHRDEV;
115: case E2IFTODT(EXT2_IFDIR):
116: return EXT2_FT_DIR;
117: case E2IFTODT(EXT2_IFBLK):
118: return EXT2_FT_BLKDEV;
119: case E2IFTODT(EXT2_IFREG):
120: return EXT2_FT_REG_FILE;
121: case E2IFTODT(EXT2_IFLNK):
122: return EXT2_FT_SYMLINK;
123: case E2IFTODT(EXT2_IFSOCK):
124: return EXT2_FT_SOCK;
125: default:
126: return 0;
127: }
128: }
129:
130: /*
131: * The EXT2FS_DIRSIZ macro gives the minimum record length which will hold
132: * the directory entryfor a name len "len" (without the terminating null byte).
133: * This requires the amount of space in struct direct
134: * without the d_name field, plus enough space for the name without a
135: * terminating null byte, rounded up to a 4 byte boundary.
136: */
137: #define EXT2FS_DIRSIZ(len) \
138: (( 8 + len + 3) &~ 3)
139:
140: /*
141: * Template for manipulating directories. Should use struct direct's,
142: * but the name field is EXT2FS_MAXNAMLEN - 1, and this just won't do.
143: */
144: struct ext2fs_dirtemplate {
145: u_int32_t dot_ino;
146: int16_t dot_reclen;
147: u_int8_t dot_namlen;
148: u_int8_t dot_type;
149: char dot_name[4]; /* must be multiple of 4 */
150: u_int32_t dotdot_ino;
151: int16_t dotdot_reclen;
152: u_int8_t dotdot_namlen;
153: u_int8_t dotdot_type;
154: char dotdot_name[4]; /* ditto */
155: };
156:
157: #endif /* !_EXT2FS_DIR_H_ */
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