188 lines
7.7 KiB
C
188 lines
7.7 KiB
C
/* $NetBSD: ext2fs_dir.h,v 1.8 2004/03/22 19:23:08 bouyer 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 8.4 (Berkeley) 8/10/94
|
|
* Modified for ext2fs by Manuel Bouyer.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1997 Manuel Bouyer.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Manuel Bouyer.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 8.4 (Berkeley) 8/10/94
|
|
* Modified for ext2fs by Manuel Bouyer.
|
|
*/
|
|
|
|
#ifndef _UFS_EXT2FS_EXT2FS_DIR_H_
|
|
#define _UFS_EXT2FS_EXT2FS_DIR_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 EXT2FS_MAXDIRSIZE (0x7fffffff)
|
|
|
|
/*
|
|
* A directory consists of some number of blocks of e2fs_bsize bytes.
|
|
*
|
|
* Each 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
|
|
* with null bytes. All names are guaranteed null terminated.
|
|
* The maximum length of a name in a directory is EXT2FS_MAXNAMLEN.
|
|
*
|
|
* The macro EXT2FS_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->e2d_reclen > DIRSIZ(fmt, dp). All d2fs_bsize 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->e2d_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->e2d_reclen. If the first entry of
|
|
* a directory block is free, then its dp->e2d_ino is set to 0.
|
|
* Entries other than the first in a directory do not normally have
|
|
* dp->e2d_ino set to 0.
|
|
* Ext2 rev 0 has a 16 bits e2d_namlen. For Ext2 vev 1 this has been split
|
|
* into a 8 bits e2d_namlen and 8 bits e2d_type (looks like ffs, isnt't it ? :)
|
|
* It's safe to use this for rev 0 as well because all ext2 are little-endian.
|
|
*/
|
|
|
|
#define EXT2FS_MAXNAMLEN 255
|
|
|
|
struct ext2fs_direct {
|
|
u_int32_t e2d_ino; /* inode number of entry */
|
|
u_int16_t e2d_reclen; /* length of this record */
|
|
u_int8_t e2d_namlen; /* length of string in d_name */
|
|
u_int8_t e2d_type; /* file type */
|
|
char e2d_name[EXT2FS_MAXNAMLEN];/* name with length <= EXT2FS_MAXNAMLEN */
|
|
};
|
|
|
|
/* Ext2 directory file types (not the same as FFS. Sigh. */
|
|
#define EXT2_FT_UNKNOWN 0
|
|
#define EXT2_FT_REG_FILE 1
|
|
#define EXT2_FT_DIR 2
|
|
#define EXT2_FT_CHRDEV 3
|
|
#define EXT2_FT_BLKDEV 4
|
|
#define EXT2_FT_FIFO 5
|
|
#define EXT2_FT_SOCK 6
|
|
#define EXT2_FT_SYMLINK 7
|
|
|
|
#define EXT2_FT_MAX 8
|
|
|
|
#define E2IFTODT(mode) (((mode) & 0170000) >> 12)
|
|
|
|
static __inline__ u_int8_t inot2ext2dt __P((u_int16_t))
|
|
__attribute__((__unused__));
|
|
static __inline__ u_int8_t
|
|
inot2ext2dt(type)
|
|
u_int16_t type;
|
|
{
|
|
switch(type) {
|
|
case E2IFTODT(EXT2_IFIFO):
|
|
return EXT2_FT_FIFO;
|
|
case E2IFTODT(EXT2_IFCHR):
|
|
return EXT2_FT_CHRDEV;
|
|
case E2IFTODT(EXT2_IFDIR):
|
|
return EXT2_FT_DIR;
|
|
case E2IFTODT(EXT2_IFBLK):
|
|
return EXT2_FT_BLKDEV;
|
|
case E2IFTODT(EXT2_IFREG):
|
|
return EXT2_FT_REG_FILE;
|
|
case E2IFTODT(EXT2_IFLNK):
|
|
return EXT2_FT_SYMLINK;
|
|
case E2IFTODT(EXT2_IFSOCK):
|
|
return EXT2_FT_SOCK;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The EXT2FS_DIRSIZ macro gives the minimum record length which will hold
|
|
* the directory entryfor a name len "len" (without the terminating null byte).
|
|
* This requires the amount of space in struct direct
|
|
* without the d_name field, plus enough space for the name without a
|
|
* terminating null byte, rounded up to a 4 byte boundary.
|
|
*/
|
|
#define EXT2FS_DIRSIZ(len) \
|
|
(( 8 + len + 3) &~ 3)
|
|
|
|
/*
|
|
* Template for manipulating directories. Should use struct direct's,
|
|
* but the name field is EXT2FS_MAXNAMLEN - 1, and this just won't do.
|
|
*/
|
|
struct ext2fs_dirtemplate {
|
|
u_int32_t dot_ino;
|
|
int16_t dot_reclen;
|
|
u_int8_t dot_namlen;
|
|
u_int8_t dot_type;
|
|
char dot_name[4]; /* must be multiple of 4 */
|
|
u_int32_t dotdot_ino;
|
|
int16_t dotdot_reclen;
|
|
u_int8_t dotdot_namlen;
|
|
u_int8_t dotdot_type;
|
|
char dotdot_name[4]; /* ditto */
|
|
};
|
|
|
|
#endif /* !_UFS_EXT2FS_EXT2FS_DIR_H_ */
|