2 /* $NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws Exp $ */
5 * SPDX-License-Identifier: BSD-4-Clause
7 * Copyright (C) 1994, 1997 Wolfgang Solfrank.
8 * Copyright (C) 1994, 1997 TooLs GmbH.
10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by TooLs GmbH.
23 * 4. The name of TooLs GmbH may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 * Written by Paul Popelka (paulp@uts.amdahl.com)
40 * You can do anything you want with this software, just don't say you wrote
41 * it, and don't remove this notice.
43 * This software is provided "as is".
45 * The author supplies this software to be publicly redistributed on the
46 * understanding that the author is not responsible for the correct
47 * functioning of this software in any circumstances and is not liable for
48 * any damages caused by this software.
53 #ifndef _FS_MSDOSFS_FAT_H_
54 #define _FS_MSDOSFS_FAT_H_
56 * Some useful cluster numbers.
58 #define MSDOSFSROOT 0 /* cluster 0 means the root dir */
59 #define CLUST_FREE 0 /* cluster 0 also means a free cluster */
60 #define MSDOSFSFREE CLUST_FREE
61 #define CLUST_FIRST 2 /* first legal cluster number */
62 #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */
63 #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
64 #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */
65 #define CLUST_EOFE 0xffffffff /* end of eof cluster range */
67 #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */
68 #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */
69 #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */
73 * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's
74 * Reference says if the maximum cluster number in a filesystem is greater
75 * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
76 * 16 bit FAT filesystem. While mounting, the result of this test is stored
79 #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK)
80 #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK)
81 #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK)
83 #define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
85 #if defined(_KERNEL) || defined(MAKEFS)
87 * These are the values for the function argument to the function
90 #define FAT_GET 0x0001 /* get a FAT entry */
91 #define FAT_SET 0x0002 /* set a FAT entry */
92 #define FAT_GET_AND_SET (FAT_GET | FAT_SET)
95 * Flags to extendfile:
97 #define DE_CLEAR 1 /* Zero out the blocks allocated */
99 int pcbmap(struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int* sp);
100 int clusterfree(struct msdosfsmount *pmp, u_long cn, u_long *oldcnp);
101 int clusteralloc(struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got);
102 int fatentry(int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents);
103 int freeclusterchain(struct msdosfsmount *pmp, u_long startchain);
104 int extendfile(struct denode *dep, u_long count, struct buf **bpp, u_long *ncp, int flags);
105 void fc_purge(struct denode *dep, u_int frcn);
106 int markvoldirty(struct msdosfsmount *pmp, int dirty);
108 #endif /* _KERNEL || MAKEFS */
109 #endif /* !_FS_MSDOSFS_FAT_H_ */