Annotation of sys/ufs/ext2fs/ext2fs_dir.h, Revision 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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