mirror of
https://github.com/reactos/reactos.git
synced 2024-09-06 02:37:06 +00:00
163 lines
5.9 KiB
C
163 lines
5.9 KiB
C
/* $NetBSD: dir.h,v 1.17 2003/08/07 16:34:42 agc Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)dir.h 8.5 (Berkeley) 4/27/95
|
|
*/
|
|
|
|
#ifndef _UFS_UFS_DIR_H_
|
|
#define _UFS_UFS_DIR_H_
|
|
|
|
#include "type.h"
|
|
|
|
/*
|
|
* Theoretically, directories can be more than 2Gb in length, however, in
|
|
* practice this seems unlikely. So, we define the type doff_t as a 32-bit
|
|
* quantity to keep down the cost of doing lookup on a 32-bit machine.
|
|
*/
|
|
#define doff_t int32_t
|
|
#define MAXDIRSIZE (0x7fffffff)
|
|
|
|
/*
|
|
* A directory consists of some number of blocks of DIRBLKSIZ
|
|
* bytes, where DIRBLKSIZ is chosen such that it can be transferred
|
|
* to disk in a single atomic operation (e.g. 512 bytes on most machines).
|
|
*
|
|
* Each DIRBLKSIZ byte block contains some number of directory entry
|
|
* structures, which are of variable length. Each directory entry has
|
|
* a struct direct at the front of it, containing its inode number,
|
|
* the length of the entry, and the length of the name contained in
|
|
* the entry. These are followed by the name padded to a 4 byte boundary.
|
|
* All names are guaranteed null terminated.
|
|
* The maximum length of a name in a directory is MAXNAMLEN.
|
|
*
|
|
* The macro DIRSIZ(fmt, dp) gives the amount of space required to represent
|
|
* a directory entry. Free space in a directory is represented by
|
|
* entries which have dp->d_reclen > DIRSIZ(fmt, dp). All DIRBLKSIZ bytes
|
|
* in a directory block are claimed by the directory entries. This
|
|
* usually results in the last entry in a directory having a large
|
|
* dp->d_reclen. When entries are deleted from a directory, the
|
|
* space is returned to the previous entry in the same directory
|
|
* block by increasing its dp->d_reclen. If the first entry of
|
|
* a directory block is free, then its dp->d_ino is set to 0.
|
|
* Entries other than the first in a directory do not normally have
|
|
* dp->d_ino set to 0.
|
|
*/
|
|
#undef DIRBLKSIZ
|
|
#define DIRBLKSIZ DEV_BSIZE
|
|
#undef MAXNAMLEN
|
|
#define MAXNAMLEN 255
|
|
#define APPLEUFS_DIRBLKSIZ 1024
|
|
|
|
struct direct {
|
|
u_int32_t d_ino; /* inode number of entry */
|
|
u_int16_t d_reclen; /* length of this record */
|
|
u_int8_t d_type; /* file type, see below */
|
|
u_int8_t d_namlen; /* length of string in d_name */
|
|
char d_name[MAXNAMLEN + 1];/* name with length <= MAXNAMLEN */
|
|
};
|
|
|
|
/*
|
|
* File types
|
|
*/
|
|
#define DT_UNKNOWN 0
|
|
#define DT_FIFO 1
|
|
#define DT_CHR 2
|
|
#define DT_DIR 4
|
|
#define DT_BLK 6
|
|
#define DT_REG 8
|
|
#define DT_LNK 10
|
|
#define DT_SOCK 12
|
|
#define DT_WHT 14
|
|
|
|
/*
|
|
* Convert between stat structure types and directory types.
|
|
*/
|
|
#define IFTODT(mode) (((mode) & 0170000) >> 12)
|
|
#define DTTOIF(dirtype) ((dirtype) << 12)
|
|
|
|
/*
|
|
* The DIRSIZ macro gives the minimum record length which will hold
|
|
* the directory entry. This requires the amount of space in struct direct
|
|
* without the d_name field, plus enough space for the name with a terminating
|
|
* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
|
|
*/
|
|
#define DIRECTSIZ(namlen) \
|
|
((sizeof(struct direct) - (MAXNAMLEN+1)) + (((namlen)+1 + 3) &~ 3))
|
|
|
|
#if (BYTE_ORDER == LITTLE_ENDIAN)
|
|
#define DIRSIZ(oldfmt, dp, needswap) \
|
|
(((oldfmt) && !(needswap)) ? \
|
|
DIRECTSIZ((dp)->d_type) : DIRECTSIZ((dp)->d_namlen))
|
|
#else
|
|
#define DIRSIZ(oldfmt, dp, needswap) \
|
|
(((oldfmt) && (needswap)) ? \
|
|
DIRECTSIZ((dp)->d_type) : DIRECTSIZ((dp)->d_namlen))
|
|
#endif
|
|
|
|
#define OLDDIRFMT 1
|
|
#define NEWDIRFMT 0
|
|
|
|
/*
|
|
* Template for manipulating directories. Should use struct direct's,
|
|
* but the name field is MAXNAMLEN - 1, and this just won't do.
|
|
*/
|
|
struct dirtemplate {
|
|
u_int32_t dot_ino;
|
|
int16_t dot_reclen;
|
|
u_int8_t dot_type;
|
|
u_int8_t dot_namlen;
|
|
char dot_name[4]; /* must be multiple of 4 */
|
|
u_int32_t dotdot_ino;
|
|
int16_t dotdot_reclen;
|
|
u_int8_t dotdot_type;
|
|
u_int8_t dotdot_namlen;
|
|
char dotdot_name[4]; /* ditto */
|
|
};
|
|
|
|
/*
|
|
* This is the old format of directories, sanz type element.
|
|
*/
|
|
struct odirtemplate {
|
|
u_int32_t dot_ino;
|
|
int16_t dot_reclen;
|
|
u_int16_t dot_namlen;
|
|
char dot_name[4]; /* must be multiple of 4 */
|
|
u_int32_t dotdot_ino;
|
|
int16_t dotdot_reclen;
|
|
u_int16_t dotdot_namlen;
|
|
char dotdot_name[4]; /* ditto */
|
|
};
|
|
#endif /* !_UFS_UFS_DIR_H_ */
|