fat.h revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: fat.h,v 1.1.2.2 2002/12/29 19:55:59 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /*- 4 1.1.2.2 thorpej * Copyright (C) 1994, 1997 Wolfgang Solfrank. 5 1.1.2.2 thorpej * Copyright (C) 1994, 1997 TooLs GmbH. 6 1.1.2.2 thorpej * All rights reserved. 7 1.1.2.2 thorpej * Original code by Paul Popelka (paulp (at) uts.amdahl.com) (see below). 8 1.1.2.2 thorpej * 9 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 10 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 11 1.1.2.2 thorpej * are met: 12 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 13 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 14 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 15 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 16 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 17 1.1.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 18 1.1.2.2 thorpej * must display the following acknowledgement: 19 1.1.2.2 thorpej * This product includes software developed by TooLs GmbH. 20 1.1.2.2 thorpej * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 1.1.2.2 thorpej * derived from this software without specific prior written permission. 22 1.1.2.2 thorpej * 23 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 1.1.2.2 thorpej * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 1.1.2.2 thorpej * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 1.1.2.2 thorpej * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 1.1.2.2 thorpej * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 1.1.2.2 thorpej * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 1.1.2.2 thorpej * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 1.1.2.2 thorpej * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 1.1.2.2 thorpej * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 1.1.2.2 thorpej * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 1.1.2.2 thorpej */ 34 1.1.2.2 thorpej /* 35 1.1.2.2 thorpej * Written by Paul Popelka (paulp (at) uts.amdahl.com) 36 1.1.2.2 thorpej * 37 1.1.2.2 thorpej * You can do anything you want with this software, just don't say you wrote 38 1.1.2.2 thorpej * it, and don't remove this notice. 39 1.1.2.2 thorpej * 40 1.1.2.2 thorpej * This software is provided "as is". 41 1.1.2.2 thorpej * 42 1.1.2.2 thorpej * The author supplies this software to be publicly redistributed on the 43 1.1.2.2 thorpej * understanding that the author is not responsible for the correct 44 1.1.2.2 thorpej * functioning of this software in any circumstances and is not liable for 45 1.1.2.2 thorpej * any damages caused by this software. 46 1.1.2.2 thorpej * 47 1.1.2.2 thorpej * October 1992 48 1.1.2.2 thorpej */ 49 1.1.2.2 thorpej 50 1.1.2.2 thorpej /* 51 1.1.2.2 thorpej * Some useful cluster numbers. 52 1.1.2.2 thorpej */ 53 1.1.2.2 thorpej #define MSDOSFSROOT 0 /* cluster 0 means the root dir */ 54 1.1.2.2 thorpej #define CLUST_FREE 0 /* cluster 0 also means a free cluster */ 55 1.1.2.2 thorpej #define MSDOSFSFREE CLUST_FREE 56 1.1.2.2 thorpej #define CLUST_FIRST 2 /* first legal cluster number */ 57 1.1.2.2 thorpej #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */ 58 1.1.2.2 thorpej #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ 59 1.1.2.2 thorpej #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */ 60 1.1.2.2 thorpej #define CLUST_EOFE 0xffffffff /* end of eof cluster range */ 61 1.1.2.2 thorpej #define CLUST_END CLUST_EOFE /* bigger than any valid cluster */ 62 1.1.2.2 thorpej 63 1.1.2.2 thorpej #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */ 64 1.1.2.2 thorpej #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */ 65 1.1.2.2 thorpej #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */ 66 1.1.2.2 thorpej 67 1.1.2.2 thorpej /* 68 1.1.2.2 thorpej * MSDOSFS: 69 1.1.2.2 thorpej * Return true if filesystem uses 12 bit fats. Microsoft Programmer's 70 1.1.2.2 thorpej * Reference says if the maximum cluster number in a filesystem is greater 71 1.1.2.2 thorpej * than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a 72 1.1.2.2 thorpej * 16 bit fat filesystem. While mounting, the result of this test is stored 73 1.1.2.2 thorpej * in pm_fatentrysize. 74 1.1.2.2 thorpej * GEMDOS-flavour (atari): 75 1.1.2.2 thorpej * If the filesystem is on floppy we've got a 12 bit fat filesystem, otherwise 76 1.1.2.2 thorpej * 16 bit. We check the d_type field in the disklabel struct while mounting 77 1.1.2.2 thorpej * and store the result in the pm_fatentrysize. Note that this kind of 78 1.1.2.2 thorpej * detection gets flakey when mounting a vnd-device. 79 1.1.2.2 thorpej */ 80 1.1.2.2 thorpej #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) 81 1.1.2.2 thorpej #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) 82 1.1.2.2 thorpej #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) 83 1.1.2.2 thorpej 84 1.1.2.2 thorpej /* 85 1.1.2.2 thorpej * M$ in it's unlimited wisdom desided that EOF mark is anything 86 1.1.2.2 thorpej * between 0xfffffff8 and 0xffffffff (masked by appropriate fatmask, 87 1.1.2.2 thorpej * of course). 88 1.1.2.2 thorpej * Note that cn is supposed to be already adjusted accordingly to FAT type. 89 1.1.2.2 thorpej */ 90 1.1.2.2 thorpej #define MSDOSFSEOF(cn, fatmask) \ 91 1.1.2.2 thorpej (((cn) & CLUST_EOFS) == (CLUST_EOFS & (fatmask))) 92 1.1.2.2 thorpej 93 1.1.2.2 thorpej #ifdef _KERNEL 94 1.1.2.2 thorpej /* 95 1.1.2.2 thorpej * These are the values for the function argument to the function 96 1.1.2.2 thorpej * fatentry(). 97 1.1.2.2 thorpej */ 98 1.1.2.2 thorpej #define FAT_GET 0x0001 /* get a fat entry */ 99 1.1.2.2 thorpej #define FAT_SET 0x0002 /* set a fat entry */ 100 1.1.2.2 thorpej #define FAT_GET_AND_SET (FAT_GET | FAT_SET) 101 1.1.2.2 thorpej 102 1.1.2.2 thorpej /* 103 1.1.2.2 thorpej * Flags to extendfile: 104 1.1.2.2 thorpej */ 105 1.1.2.2 thorpej #define DE_CLEAR 1 /* Zero out the blocks allocated */ 106 1.1.2.2 thorpej 107 1.1.2.2 thorpej int pcbmap __P((struct denode *, u_long, daddr_t *, u_long *, int *)); 108 1.1.2.2 thorpej int clusterfree __P((struct msdosfsmount *, u_long, u_long *)); 109 1.1.2.2 thorpej int clusteralloc __P((struct msdosfsmount *, u_long, u_long,u_long *,u_long *)); 110 1.1.2.2 thorpej int extendfile __P((struct denode *, u_long, struct buf **, u_long *, int)); 111 1.1.2.2 thorpej int fatentry __P((int, struct msdosfsmount *, u_long, u_long *, u_long)); 112 1.1.2.2 thorpej void fc_purge __P((struct denode *, u_int)); 113 1.1.2.2 thorpej void fc_lookup __P((struct denode *, u_long, u_long *, u_long *)); 114 1.1.2.2 thorpej int fillinusemap __P((struct msdosfsmount *)); 115 1.1.2.2 thorpej int freeclusterchain __P((struct msdosfsmount *, u_long)); 116 1.1.2.2 thorpej #endif /* _KERNEL */ 117
Indexes created Thu Oct 30 16:09:53 GMT 2025