Annotation of src/sys/ufs/ufs/dir.h, Revision 1.20.74.1
1.20.74.1! yamt 1: /* $NetBSD: dir.h,v 1.20 2005/12/11 12:25:28 christos Exp $ */
1.5 mycroft 2:
1.1 mycroft 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.
1.17 agc 20: * 3. Neither the name of the University nor the names of its contributors
1.1 mycroft 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: *
1.9 fvdl 36: * @(#)dir.h 8.5 (Berkeley) 4/27/95
1.1 mycroft 37: */
38:
1.15 matt 39: #ifndef _UFS_UFS_DIR_H_
40: #define _UFS_UFS_DIR_H_
1.6 cgd 41:
42: /*
1.20.74.1! yamt 43: * Theoretically, directories can be more than 2Gb in length; however, in
1.6 cgd 44: * practice this seems unlikely. So, we define the type doff_t as a 32-bit
45: * quantity to keep down the cost of doing lookup on a 32-bit machine.
1.9 fvdl 46: */
1.6 cgd 47: #define doff_t int32_t
48: #define MAXDIRSIZE (0x7fffffff)
1.1 mycroft 49:
50: /*
1.4 mycroft 51: * A directory consists of some number of blocks of DIRBLKSIZ
52: * bytes, where DIRBLKSIZ is chosen such that it can be transferred
53: * to disk in a single atomic operation (e.g. 512 bytes on most machines).
1.1 mycroft 54: *
55: * Each DIRBLKSIZ byte block contains some number of directory entry
1.4 mycroft 56: * structures, which are of variable length. Each directory entry has
57: * a struct direct at the front of it, containing its inode number,
58: * the length of the entry, and the length of the name contained in
1.16 christos 59: * the entry. These are followed by the name padded to a 4 byte boundary.
60: * All names are guaranteed null terminated.
1.19 christos 61: * The maximum length of a name in a directory is FFS_MAXNAMLEN.
1.1 mycroft 62: *
63: * The macro DIRSIZ(fmt, dp) gives the amount of space required to represent
1.4 mycroft 64: * a directory entry. Free space in a directory is represented by
65: * entries which have dp->d_reclen > DIRSIZ(fmt, dp). All DIRBLKSIZ bytes
66: * in a directory block are claimed by the directory entries. This
67: * usually results in the last entry in a directory having a large
68: * dp->d_reclen. When entries are deleted from a directory, the
69: * space is returned to the previous entry in the same directory
70: * block by increasing its dp->d_reclen. If the first entry of
71: * a directory block is free, then its dp->d_ino is set to 0.
72: * Entries other than the first in a directory do not normally have
73: * dp->d_ino set to 0.
1.1 mycroft 74: */
1.13 lukem 75: #undef DIRBLKSIZ
76: #define DIRBLKSIZ DEV_BSIZE
1.19 christos 77: #define FFS_MAXNAMLEN 255
1.14 dbj 78: #define APPLEUFS_DIRBLKSIZ 1024
1.1 mycroft 79:
1.18 christos 80: #define d_ino d_fileno
1.1 mycroft 81: struct direct {
1.18 christos 82: u_int32_t d_fileno; /* inode number of entry */
1.4 mycroft 83: u_int16_t d_reclen; /* length of this record */
84: u_int8_t d_type; /* file type, see below */
85: u_int8_t d_namlen; /* length of string in d_name */
1.19 christos 86: char d_name[FFS_MAXNAMLEN + 1];/* name with length <= FFS_MAXNAMLEN */
1.1 mycroft 87: };
88:
89: /*
90: * File types
91: */
92: #define DT_UNKNOWN 0
93: #define DT_FIFO 1
94: #define DT_CHR 2
95: #define DT_DIR 4
96: #define DT_BLK 6
97: #define DT_REG 8
98: #define DT_LNK 10
99: #define DT_SOCK 12
1.4 mycroft 100: #define DT_WHT 14
1.1 mycroft 101:
102: /*
103: * Convert between stat structure types and directory types.
104: */
105: #define IFTODT(mode) (((mode) & 0170000) >> 12)
106: #define DTTOIF(dirtype) ((dirtype) << 12)
107:
108: /*
109: * The DIRSIZ macro gives the minimum record length which will hold
110: * the directory entry. This requires the amount of space in struct direct
111: * without the d_name field, plus enough space for the name with a terminating
112: * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
113: */
1.11 lukem 114: #define DIRECTSIZ(namlen) \
1.19 christos 115: ((sizeof(struct direct) - (FFS_MAXNAMLEN+1)) + (((namlen)+1 + 3) &~ 3))
1.11 lukem 116:
1.1 mycroft 117: #if (BYTE_ORDER == LITTLE_ENDIAN)
1.11 lukem 118: #define DIRSIZ(oldfmt, dp, needswap) \
119: (((oldfmt) && !(needswap)) ? \
120: DIRECTSIZ((dp)->d_type) : DIRECTSIZ((dp)->d_namlen))
1.1 mycroft 121: #else
1.11 lukem 122: #define DIRSIZ(oldfmt, dp, needswap) \
123: (((oldfmt) && (needswap)) ? \
124: DIRECTSIZ((dp)->d_type) : DIRECTSIZ((dp)->d_namlen))
1.1 mycroft 125: #endif
1.11 lukem 126:
1.1 mycroft 127: #define OLDDIRFMT 1
128: #define NEWDIRFMT 0
129:
130: /*
1.3 cgd 131: * Template for manipulating directories. Should use struct direct's,
1.19 christos 132: * but the name field is FFS_MAXNAMLEN - 1, and this just won't do.
1.1 mycroft 133: */
134: struct dirtemplate {
1.3 cgd 135: u_int32_t dot_ino;
136: int16_t dot_reclen;
137: u_int8_t dot_type;
138: u_int8_t dot_namlen;
1.4 mycroft 139: char dot_name[4]; /* must be multiple of 4 */
1.3 cgd 140: u_int32_t dotdot_ino;
141: int16_t dotdot_reclen;
142: u_int8_t dotdot_type;
143: u_int8_t dotdot_namlen;
1.4 mycroft 144: char dotdot_name[4]; /* ditto */
1.1 mycroft 145: };
146:
147: /*
148: * This is the old format of directories, sanz type element.
149: */
150: struct odirtemplate {
1.3 cgd 151: u_int32_t dot_ino;
152: int16_t dot_reclen;
153: u_int16_t dot_namlen;
1.4 mycroft 154: char dot_name[4]; /* must be multiple of 4 */
1.3 cgd 155: u_int32_t dotdot_ino;
156: int16_t dotdot_reclen;
157: u_int16_t dotdot_namlen;
1.4 mycroft 158: char dotdot_name[4]; /* ditto */
1.1 mycroft 159: };
1.15 matt 160: #endif /* !_UFS_UFS_DIR_H_ */
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