115 lines
4.9 KiB
C
115 lines
4.9 KiB
C
/* $NetBSD: ext2fs_dir.h,v 1.2 1998/09/13 15:14:40 christos Exp $ */
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/*
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* Copyright (c) 1997 Manuel Bouyer.
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)dir.h 8.4 (Berkeley) 8/10/94
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* Modified for ext2fs by Manuel Bouyer.
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*/
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#ifndef _EXT2FS_DIR_H_
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#define _EXT2FS_DIR_H_
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/*
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* Theoretically, directories can be more than 2Gb in length, however, in
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* practice this seems unlikely. So, we define the type doff_t as a 32-bit
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* quantity to keep down the cost of doing lookup on a 32-bit machine.
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*/
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#define doff_t int32_t
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#define EXT2FS_MAXDIRSIZE (0x7fffffff)
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/*
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* A directory consists of some number of blocks of e2fs_bsize bytes.
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*
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* Each block contains some number of directory entry
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* structures, which are of variable length. Each directory entry has
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* a struct direct at the front of it, containing its inode number,
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* the length of the entry, and the length of the name contained in
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* the entry. These are followed by the name padded to a 4 byte boundary
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* with null bytes. All names are guaranteed null terminated.
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* The maximum length of a name in a directory is EXT2FS_MAXNAMLEN.
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*
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* The macro EXT2FS_DIRSIZ(fmt, dp) gives the amount of space required to
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* represent a directory entry. Free space in a directory is represented by
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* entries which have dp->e2d_reclen > DIRSIZ(fmt, dp). All d2fs_bsize bytes
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* in a directory block are claimed by the directory entries. This
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* usually results in the last entry in a directory having a large
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* dp->e2d_reclen. When entries are deleted from a directory, the
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* space is returned to the previous entry in the same directory
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* block by increasing its dp->e2d_reclen. If the first entry of
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* a directory block is free, then its dp->e2d_ino is set to 0.
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* Entries other than the first in a directory do not normally have
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* dp->e2d_ino set to 0.
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*/
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#define EXT2FS_MAXNAMLEN 255
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struct ext2fs_direct {
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u_int32_t e2d_ino; /* inode number of entry */
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u_int16_t e2d_reclen; /* length of this record */
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u_int16_t e2d_namlen; /* length of string in d_name */
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char e2d_name[EXT2FS_MAXNAMLEN];/* name with length <= EXT2FS_MAXNAMLEN */
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};
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/*
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* The EXT2FS_DIRSIZ macro gives the minimum record length which will hold
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* the directory entryfor a name len "len" (without the terminating null byte).
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* This requires the amount of space in struct direct
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* without the d_name field, plus enough space for the name without a
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* terminating null byte, rounded up to a 4 byte boundary.
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*/
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#define EXT2FS_DIRSIZ(len) \
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(( 8 + len + 3) &~ 3)
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/*
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* Template for manipulating directories. Should use struct direct's,
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* but the name field is EXT2FS_MAXNAMLEN - 1, and this just won't do.
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*/
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struct ext2fs_dirtemplate {
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u_int32_t dot_ino;
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int16_t dot_reclen;
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u_int16_t dot_namlen;
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char dot_name[4]; /* must be multiple of 4 */
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u_int32_t dotdot_ino;
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int16_t dotdot_reclen;
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u_int16_t dotdot_namlen;
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char dotdot_name[4]; /* ditto */
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};
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#endif /* !_EXT2FS_DIR_H_ */
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