1 /* $OpenBSD: fat.h,v 1.13 2021/07/11 04:34:13 jsg Exp $ */ 2 /* $NetBSD: fat.h,v 1.11 1997/10/17 11:23:49 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 #define CLUST_END CLUST_EOFE /* bigger than any valid cluster */ 63 64 #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */ 65 #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */ 66 #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */ 67 68 /* 69 * MSDOSFS: 70 * Return true if filesystem uses 12 bit fats. Microsoft Programmer's 71 * Reference says if the maximum cluster number in a filesystem is greater 72 * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a 73 * 16 bit fat filesystem. While mounting, the result of this test is stored 74 * in pm_fatentrysize. 75 */ 76 #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) 77 #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) 78 #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) 79 80 #define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS) 81 82 #ifdef _KERNEL 83 /* 84 * These are the values for the function argument to the function 85 * fatentry(). 86 */ 87 #define FAT_GET 0x0001 /* get a fat entry */ 88 #define FAT_SET 0x0002 /* set a fat entry */ 89 #define FAT_GET_AND_SET (FAT_GET | FAT_SET) 90 91 /* 92 * Flags to extendfile: 93 */ 94 #define DE_CLEAR 1 /* Zero out the blocks allocated */ 95 96 int pcbmap(struct denode *, uint32_t, daddr_t *, uint32_t *, int *); 97 int clusterfree(struct msdosfsmount *, uint32_t, uint32_t *); 98 int clusteralloc(struct msdosfsmount *, uint32_t, uint32_t, uint32_t *, uint32_t *); 99 int extendfile(struct denode *, uint32_t, struct buf **, uint32_t *, int); 100 int fatentry(int, struct msdosfsmount *, uint32_t, uint32_t *, uint32_t); 101 void fc_purge(struct denode *, u_int); 102 void fc_lookup(struct denode *, uint32_t, uint32_t *, uint32_t *); 103 int fillinusemap(struct msdosfsmount *); 104 int freeclusterchain(struct msdosfsmount *, uint32_t); 105 #endif /* _KERNEL */ 106