1 /* $FreeBSD$ */ 2 /* $NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 /* 52 * Some useful cluster numbers. 53 */ 54 #define MSDOSFSROOT 0 /* cluster 0 means the root dir */ 55 #define CLUST_FREE 0 /* cluster 0 also means a free cluster */ 56 #define MSDOSFSFREE CLUST_FREE 57 #define CLUST_FIRST 2 /* first legal cluster number */ 58 #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */ 59 #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ 60 #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */ 61 #define CLUST_EOFE 0xffffffff /* end of eof cluster range */ 62 63 #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */ 64 #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */ 65 #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */ 66 67 /* 68 * MSDOSFS: 69 * Return true if filesystem uses 12 bit fats. Microsoft Programmer's 70 * Reference says if the maximum cluster number in a filesystem is greater 71 * than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a 72 * 16 bit fat filesystem. While mounting, the result of this test is stored 73 * in pm_fatentrysize. 74 */ 75 #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) 76 #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) 77 #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) 78 79 #define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS) 80 81 #ifdef _KERNEL 82 /* 83 * These are the values for the function argument to the function 84 * fatentry(). 85 */ 86 #define FAT_GET 0x0001 /* get a fat entry */ 87 #define FAT_SET 0x0002 /* set a fat entry */ 88 #define FAT_GET_AND_SET (FAT_GET | FAT_SET) 89 90 /* 91 * Flags to extendfile: 92 */ 93 #define DE_CLEAR 1 /* Zero out the blocks allocated */ 94 95 int pcbmap(struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp); 96 int clusterfree(struct msdosfsmount *pmp, u_long cn, u_long *oldcnp); 97 int clusteralloc(struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got); 98 int fatentry(int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents); 99 int freeclusterchain(struct msdosfsmount *pmp, u_long startchain); 100 int extendfile(struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags); 101 void fc_purge(struct denode *dep, u_int frcn); 102 int markvoldirty(struct msdosfsmount *pmp, int dirty); 103 104 #endif /* _KERNEL */ 105