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