/* $OpenBSD: fat.h,v 1.1 2016/10/18 17:05:30 natano Exp $ */ /* $NetBSD: fat.h,v 1.9 2014/10/18 08:33:28 snj Exp $ */ /*- * Copyright (C) 1994, 1997 Wolfgang Solfrank. * Copyright (C) 1994, 1997 TooLs GmbH. * All rights reserved. * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Written by Paul Popelka (paulp@uts.amdahl.com) * * You can do anything you want with this software, just don't say you wrote * it, and don't remove this notice. * * This software is provided "as is". * * The author supplies this software to be publicly redistributed on the * understanding that the author is not responsible for the correct * functioning of this software in any circumstances and is not liable for * any damages caused by this software. * * October 1992 */ #ifndef _MSDOSFS_FAT_H_ #define _MSDOSFS_FAT_H_ /* * Some useful cluster numbers. */ #define MSDOSFSROOT 0 /* cluster 0 means the root dir */ #define CLUST_FREE 0 /* cluster 0 also means a free cluster */ #define MSDOSFSFREE CLUST_FREE #define CLUST_FIRST 2 /* first legal cluster number */ #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */ #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */ #define CLUST_EOFE 0xffffffff /* end of eof cluster range */ #define CLUST_END CLUST_EOFE /* bigger than any valid cluster */ #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */ #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */ #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */ /* * MSDOSFS: * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's * Reference says if the maximum cluster number in a filesystem is greater * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a * 16 bit FAT filesystem. While mounting, the result of this test is stored * in pm_fatentrysize. */ #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) /* * M$ in its unlimited wisdom decided that EOF mark is anything * between 0xfffffff8 and 0xffffffff (masked by appropriate fatmask, * of course). * Note that cn is supposed to be already adjusted accordingly to FAT type. */ #define MSDOSFSEOF(cn, fatmask) \ (((cn) & CLUST_EOFS) == (CLUST_EOFS & (fatmask))) /* * These are the values for the function argument to the function * fatentry(). */ #define FAT_GET 0x0001 /* get a FAT entry */ #define FAT_SET 0x0002 /* set a FAT entry */ #define FAT_GET_AND_SET (FAT_GET | FAT_SET) /* * Flags to extendfile: */ #define DE_CLEAR 1 /* Zero out the blocks allocated */ int pcbmap(struct denode *, u_long, daddr_t *, u_long *, int *); int clusterfree(struct msdosfsmount *, u_long, u_long *); int clusteralloc(struct msdosfsmount *, u_long, u_long,u_long *,u_long *); int extendfile(struct denode *, u_long, struct mkfsbuf **, u_long *, int); int fatentry(int, struct msdosfsmount *, u_long, u_long *, u_long); void fc_purge(struct denode *, u_int); void fc_lookup(struct denode *, u_long, u_long *, u_long *); int fillinusemap(struct msdosfsmount *); int freeclusterchain(struct msdosfsmount *, u_long); #endif /* _MSDOSFS_FAT_H_ */
