Annotation of src/sys/fs/msdosfs/fat.h, Revision 1.4.120.3
1.4.120.3! jdolecek 1: /* $NetBSD$ */
1.1 jdolecek 2:
3: /*-
4: * Copyright (C) 1994, 1997 Wolfgang Solfrank.
5: * Copyright (C) 1994, 1997 TooLs GmbH.
6: * All rights reserved.
7: * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. All advertising materials mentioning features or use of this software
18: * must display the following acknowledgement:
19: * This product includes software developed by TooLs GmbH.
20: * 4. The name of TooLs GmbH may not be used to endorse or promote products
21: * derived from this software without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34: /*
35: * Written by Paul Popelka (paulp@uts.amdahl.com)
36: *
37: * You can do anything you want with this software, just don't say you wrote
38: * it, and don't remove this notice.
39: *
40: * This software is provided "as is".
41: *
42: * The author supplies this software to be publicly redistributed on the
43: * understanding that the author is not responsible for the correct
44: * functioning of this software in any circumstances and is not liable for
45: * any damages caused by this software.
46: *
47: * October 1992
48: */
49:
1.4 christos 50: #ifndef _MSDOSFS_FAT_H_
51: #define _MSDOSFS_FAT_H_
1.1 jdolecek 52: /*
53: * Some useful cluster numbers.
54: */
55: #define MSDOSFSROOT 0 /* cluster 0 means the root dir */
56: #define CLUST_FREE 0 /* cluster 0 also means a free cluster */
57: #define MSDOSFSFREE CLUST_FREE
58: #define CLUST_FIRST 2 /* first legal cluster number */
59: #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */
60: #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
61: #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */
62: #define CLUST_EOFE 0xffffffff /* end of eof cluster range */
63: #define CLUST_END CLUST_EOFE /* bigger than any valid cluster */
64:
65: #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */
66: #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */
67: #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */
68:
69: /*
70: * MSDOSFS:
1.4.120.1 tls 71: * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's
1.1 jdolecek 72: * Reference says if the maximum cluster number in a filesystem is greater
1.4.120.1 tls 73: * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
74: * 16 bit FAT filesystem. While mounting, the result of this test is stored
1.1 jdolecek 75: * in pm_fatentrysize.
76: * GEMDOS-flavour (atari):
1.4.120.1 tls 77: * If the filesystem is on floppy we've got a 12 bit FAT filesystem, otherwise
1.1 jdolecek 78: * 16 bit. We check the d_type field in the disklabel struct while mounting
79: * and store the result in the pm_fatentrysize. Note that this kind of
80: * detection gets flakey when mounting a vnd-device.
81: */
82: #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK)
83: #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK)
84: #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK)
85:
86: /*
1.4.120.3! jdolecek 87: * M$ in its unlimited wisdom decided that EOF mark is anything
1.1 jdolecek 88: * between 0xfffffff8 and 0xffffffff (masked by appropriate fatmask,
89: * of course).
90: * Note that cn is supposed to be already adjusted accordingly to FAT type.
1.2 perry 91: */
1.1 jdolecek 92: #define MSDOSFSEOF(cn, fatmask) \
93: (((cn) & CLUST_EOFS) == (CLUST_EOFS & (fatmask)))
94:
1.4.120.2 tls 95: #if defined(_KERNEL) || defined(MAKEFS)
1.1 jdolecek 96: /*
97: * These are the values for the function argument to the function
98: * fatentry().
99: */
1.4.120.1 tls 100: #define FAT_GET 0x0001 /* get a FAT entry */
101: #define FAT_SET 0x0002 /* set a FAT entry */
1.1 jdolecek 102: #define FAT_GET_AND_SET (FAT_GET | FAT_SET)
103:
104: /*
105: * Flags to extendfile:
106: */
107: #define DE_CLEAR 1 /* Zero out the blocks allocated */
108:
1.3 xtraeme 109: int pcbmap(struct denode *, u_long, daddr_t *, u_long *, int *);
110: int clusterfree(struct msdosfsmount *, u_long, u_long *);
111: int clusteralloc(struct msdosfsmount *, u_long, u_long,u_long *,u_long *);
112: int extendfile(struct denode *, u_long, struct buf **, u_long *, int);
113: int fatentry(int, struct msdosfsmount *, u_long, u_long *, u_long);
114: void fc_purge(struct denode *, u_int);
115: void fc_lookup(struct denode *, u_long, u_long *, u_long *);
116: int fillinusemap(struct msdosfsmount *);
117: int freeclusterchain(struct msdosfsmount *, u_long);
1.4.120.2 tls 118: #endif /* _KERNEL || MAKEFS */
1.4 christos 119: #endif /* _MSDOSFS_FAT_H_ */
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