1/*	$NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws Exp $	*/
  2
  3/*-
  4 * SPDX-License-Identifier: BSD-4-Clause
  5 *
  6 * Copyright (C) 1994, 1997 Wolfgang Solfrank.
  7 * Copyright (C) 1994, 1997 TooLs GmbH.
  8 * All rights reserved.
  9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
 10 *
 11 * Redistribution and use in source and binary forms, with or without
 12 * modification, are permitted provided that the following conditions
 13 * are met:
 14 * 1. Redistributions of source code must retain the above copyright
 15 *    notice, this list of conditions and the following disclaimer.
 16 * 2. Redistributions in binary form must reproduce the above copyright
 17 *    notice, this list of conditions and the following disclaimer in the
 18 *    documentation and/or other materials provided with the distribution.
 19 * 3. All advertising materials mentioning features or use of this software
 20 *    must display the following acknowledgement:
 21 *	This product includes software developed by TooLs GmbH.
 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 23 *    derived from this software without specific prior written permission.
 24 *
 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 35 */
 36/*-
 37 * Written by Paul Popelka (paulp@uts.amdahl.com)
 38 *
 39 * You can do anything you want with this software, just don't say you wrote
 40 * it, and don't remove this notice.
 41 *
 42 * This software is provided "as is".
 43 *
 44 * The author supplies this software to be publicly redistributed on the
 45 * understanding that the author is not responsible for the correct
 46 * functioning of this software in any circumstances and is not liable for
 47 * any damages caused by this software.
 48 *
 49 * October 1992
 50 */
 51
 52#ifndef _FS_MSDOSFS_FAT_H_
 53#define	_FS_MSDOSFS_FAT_H_
 54/*
 55 * Some useful cluster numbers.
 56 */
 57#define	MSDOSFSROOT	0		/* cluster 0 means the root dir */
 58#define	CLUST_FREE	0		/* cluster 0 also means a free cluster */
 59#define	MSDOSFSFREE	CLUST_FREE
 60#define	CLUST_FIRST	2		/* first legal cluster number */
 61#define	CLUST_RSRVD	0xfffffff6	/* reserved cluster range */
 62#define	CLUST_BAD	0xfffffff7	/* a cluster with a defect */
 63#define	CLUST_EOFS	0xfffffff8	/* start of eof cluster range */
 64#define	CLUST_EOFE	0xffffffff	/* end of eof cluster range */
 65
 66#define	FAT12_MASK	0x00000fff	/* mask for 12 bit cluster numbers */
 67#define	FAT16_MASK	0x0000ffff	/* mask for 16 bit cluster numbers */
 68#define	FAT32_MASK	0x0fffffff	/* mask for FAT32 cluster numbers */
 69
 70/*
 71 * MSDOSFS:
 72 * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's
 73 * Reference says if the maximum cluster number in a filesystem is greater
 74 * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
 75 * 16 bit FAT filesystem. While mounting, the result of this test is stored
 76 * in pm_fatentrysize.
 77 */
 78#define	FAT12(pmp)	(pmp->pm_fatmask == FAT12_MASK)
 79#define	FAT16(pmp)	(pmp->pm_fatmask == FAT16_MASK)
 80#define	FAT32(pmp)	(pmp->pm_fatmask == FAT32_MASK)
 81
 82#define	MSDOSFSEOF(pmp, cn)	((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
 83
 84#if defined (_KERNEL) || defined(MAKEFS)
 85/*
 86 * These are the values for the function argument to the function
 87 * fatentry().
 88 */
 89#define	FAT_GET		0x0001	/* get a FAT entry */
 90#define	FAT_SET		0x0002	/* set a FAT entry */
 91#define	FAT_GET_AND_SET	(FAT_GET | FAT_SET)
 92
 93/*
 94 * Flags to extendfile:
 95 */
 96#define	DE_CLEAR	1	/* Zero out the blocks allocated */
 97
 98int pcbmap(struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp);
 99void clusterfree(struct msdosfsmount *pmp, u_long cn);
100int clusteralloc(struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got);
101int fatentry(int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents);
102int freeclusterchain(struct msdosfsmount *pmp, u_long startchain);
103int extendfile(struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags);
104void fc_purge(struct denode *dep, u_int frcn);
105int markvoldirty_upgrade(struct msdosfsmount *pmp, bool dirty, bool rw_upgrade);
106
107static inline int
108markvoldirty(struct msdosfsmount *pmp, bool dirty)
109{
110	return (markvoldirty_upgrade(pmp, dirty, false));
111}
112
113#endif	/* _KERNEL || MAKEFS */
114#endif	/* !_FS_MSDOSFS_FAT_H_ */