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Annotation of qemu/roms/openbios/fs/grubfs/dir.h, revision 1.1

1.1     ! root        1: 
        !             2: /*
        !             3:  * Mach Operating System
        !             4:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !             5:  * All Rights Reserved.
        !             6:  *
        !             7:  * Permission to use, copy, modify and distribute this software and its
        !             8:  * documentation is hereby granted, provided that both the copyright
        !             9:  * notice and this permission notice appear in all copies of the
        !            10:  * software, derivative works or modified versions, and any portions
        !            11:  * thereof, and that both notices appear in supporting documentation.
        !            12:  *
        !            13:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            14:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            15:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            16:  *
        !            17:  * Carnegie Mellon requests users of this software to return to
        !            18:  *
        !            19:  *  Software Distribution Coordinator  or  [email protected]
        !            20:  *  School of Computer Science
        !            21:  *  Carnegie Mellon University
        !            22:  *  Pittsburgh PA 15213-3890
        !            23:  *
        !            24:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            25:  * the rights to redistribute these changes.
        !            26:  */
        !            27: /*
        !            28:  * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
        !            29:  * All rights reserved.
        !            30:  *
        !            31:  * Redistribution and use in source and binary forms are permitted
        !            32:  * provided that the above copyright notice and this paragraph are
        !            33:  * duplicated in all such forms and that any documentation,
        !            34:  * advertising materials, and other materials related to such
        !            35:  * distribution and use acknowledge that the software was developed
        !            36:  * by the University of California, Berkeley.  The name of the
        !            37:  * University may not be used to endorse or promote products derived
        !            38:  * from this software without specific prior written permission.
        !            39:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            40:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            41:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            42:  *
        !            43:  *     @(#)dir.h       7.6 (Berkeley) 5/9/89
        !            44:  */
        !            45: 
        !            46: #ifndef _BOOT_UFS_DIR_H_
        !            47: #define        _BOOT_UFS_DIR_H_
        !            48: 
        !            49: /*
        !            50:  * A directory consists of some number of blocks of DIRBLKSIZ
        !            51:  * bytes, where DIRBLKSIZ is chosen such that it can be transferred
        !            52:  * to disk in a single atomic operation (e.g. 512 bytes on most machines).
        !            53:  *
        !            54:  * Each DIRBLKSIZ byte block contains some number of directory entry
        !            55:  * structures, which are of variable length.  Each directory entry has
        !            56:  * a struct direct at the front of it, containing its inode number,
        !            57:  * the length of the entry, and the length of the name contained in
        !            58:  * the entry.  These are followed by the name padded to a 4 byte boundary
        !            59:  * with null bytes.  All names are guaranteed null terminated.
        !            60:  * The maximum length of a name in a directory is MAXNAMLEN.
        !            61:  *
        !            62:  * The macro DIRSIZ(dp) gives the amount of space required to represent
        !            63:  * a directory entry.  Free space in a directory is represented by
        !            64:  * entries which have dp->d_reclen > DIRSIZ(dp).  All DIRBLKSIZ bytes
        !            65:  * in a directory block are claimed by the directory entries.  This
        !            66:  * usually results in the last entry in a directory having a large
        !            67:  * dp->d_reclen.  When entries are deleted from a directory, the
        !            68:  * space is returned to the previous entry in the same directory
        !            69:  * block by increasing its dp->d_reclen.  If the first entry of
        !            70:  * a directory block is free, then its dp->d_ino is set to 0.
        !            71:  * Entries other than the first in a directory do not normally have
        !            72:  * dp->d_ino set to 0.
        !            73:  */
        !            74: #define DIRBLKSIZ      DEV_BSIZE
        !            75: #define        MAXNAMLEN       255
        !            76: 
        !            77: struct direct
        !            78:   {
        !            79:     unsigned int d_ino;                /* inode number of entry */
        !            80:     unsigned short d_reclen;   /* length of this record */
        !            81:     unsigned short d_namlen;   /* length of string in d_name */
        !            82:     char d_name[MAXNAMLEN + 1];        /* name with length <= MAXNAMLEN */
        !            83:   };
        !            84: 
        !            85: /*
        !            86:  * The DIRSIZ macro gives the minimum record length which will hold
        !            87:  * the directory entry.  This requires the amount of space in struct direct
        !            88:  * without the d_name field, plus enough space for the name with a terminating
        !            89:  * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
        !            90:  */
        !            91: #undef DIRSIZ
        !            92: #define DIRSIZ(dp) \
        !            93:     ((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
        !            94: 
        !            95: #ifdef KERNEL
        !            96: /*
        !            97:  * Template for manipulating directories.
        !            98:  * Should use struct direct's, but the name field
        !            99:  * is MAXNAMLEN - 1, and this just won't do.
        !           100:  */
        !           101: struct dirtemplate
        !           102:   {
        !           103:     unsigned int dot_ino;
        !           104:     short dot_reclen;
        !           105:     short dot_namlen;
        !           106:     char dot_name[4];          /* must be multiple of 4 */
        !           107:     unsigned int dotdot_ino;
        !           108:     short dotdot_reclen;
        !           109:     short dotdot_namlen;
        !           110:     char dotdot_name[4];       /* ditto */
        !           111:   };
        !           112: #endif
        !           113: 
        !           114: /*
        !           115:  * The following information should be obtained from <dirent.h>
        !           116:  * and is provided solely (and temporarily) for backward compatibility.
        !           117:  */
        !           118: #ifndef KERNEL
        !           119: #define d_fileno d_ino         /* compatibility with POSIX */
        !           120: #ifndef DEV_BSIZE
        !           121: #define        DEV_BSIZE       512
        !           122: #endif
        !           123: /*
        !           124:  * Definitions for library routines operating on directories.
        !           125:  */
        !           126: typedef struct _dirdesc
        !           127:   {
        !           128:     int dd_fd;
        !           129:     int dd_loc;
        !           130:     int dd_size;
        !           131:     char dd_buf[DIRBLKSIZ];
        !           132:   }
        !           133: DIR;
        !           134: 
        !           135: #define dirfd(dirp)    ((dirp)->dd_fd)
        !           136: 
        !           137: #ifndef NULL
        !           138: #define NULL 0
        !           139: #endif
        !           140: #endif /* not KERNEL */
        !           141: #endif /* _BOOT_UFS_DIR_H_ */

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