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Diffstat (limited to 'sys/fs/msdosfs/fat.h')
| -rw-r--r-- | sys/fs/msdosfs/fat.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/fat.h b/sys/fs/msdosfs/fat.h new file mode 100644 index 0000000..9f20cba --- /dev/null +++ b/sys/fs/msdosfs/fat.h @@ -0,0 +1,108 @@ +/* $FreeBSD$ */ +/* $NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws 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 + */ + +/* + * 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 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 4078 ((CLUST_RSRVS - 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. + * GEMDOS-flavour (atari): + * If the filesystem is on floppy we've got a 12 bit fat filesystem, otherwise + * 16 bit. We check the d_type field in the disklabel struct while mounting + * and store the result in the pm_fatentrysize. Note that this kind of + * detection gets flakey when mounting a vnd-device. + */ +#define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) +#define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) +#define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) + +#define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS) + +#ifdef KERNEL +/* + * 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 __P((struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp)); +int clusterfree __P((struct msdosfsmount *pmp, u_long cn, u_long *oldcnp)); +int clusteralloc __P((struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got)); +int fatentry __P((int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents)); +int freeclusterchain __P((struct msdosfsmount *pmp, u_long startchain)); +int extendfile __P((struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags)); +void fc_purge __P((struct denode *dep, u_int frcn)); + +#endif /* KERNEL */ |
