Annotation of sys/msdosfs/fat.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: fat.h,v 1.9 2006/12/15 03:04:24 krw Exp $ */
2: /* $NetBSD: fat.h,v 1.11 1997/10/17 11:23:49 ws Exp $ */
3:
4: /*-
5: * Copyright (C) 1994, 1997 Wolfgang Solfrank.
6: * Copyright (C) 1994, 1997 TooLs GmbH.
7: * All rights reserved.
8: * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by TooLs GmbH.
21: * 4. The name of TooLs GmbH may not be used to endorse or promote products
22: * derived from this software without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34: */
35: /*
36: * Written by Paul Popelka (paulp@uts.amdahl.com)
37: *
38: * You can do anything you want with this software, just don't say you wrote
39: * it, and don't remove this notice.
40: *
41: * This software is provided "as is".
42: *
43: * The author supplies this software to be publicly redistributed on the
44: * understanding that the author is not responsible for the correct
45: * functioning of this software in any circumstances and is not liable for
46: * any damages caused by this software.
47: *
48: * October 1992
49: */
50:
51: /*
52: * Some useful cluster numbers.
53: */
54: #define MSDOSFSROOT 0 /* cluster 0 means the root dir */
55: #define CLUST_FREE 0 /* cluster 0 also means a free cluster */
56: #define MSDOSFSFREE CLUST_FREE
57: #define CLUST_FIRST 2 /* first legal cluster number */
58: #define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */
59: #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
60: #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */
61: #define CLUST_EOFE 0xffffffff /* end of eof cluster range */
62:
63: #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */
64: #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */
65: #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */
66:
67: /*
68: * MSDOSFS:
69: * Return true if filesystem uses 12 bit fats. Microsoft Programmer's
70: * Reference says if the maximum cluster number in a filesystem is greater
71: * than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a
72: * 16 bit fat filesystem. While mounting, the result of this test is stored
73: * in pm_fatentrysize.
74: */
75: #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK)
76: #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK)
77: #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK)
78:
79: #define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)
80:
81: #ifdef _KERNEL
82: /*
83: * These are the values for the function argument to the function
84: * fatentry().
85: */
86: #define FAT_GET 0x0001 /* get a fat entry */
87: #define FAT_SET 0x0002 /* set a fat entry */
88: #define FAT_GET_AND_SET (FAT_GET | FAT_SET)
89:
90: /*
91: * Flags to extendfile:
92: */
93: #define DE_CLEAR 1 /* Zero out the blocks allocated */
94:
95: int pcbmap(struct denode *, uint32_t, daddr64_t *, uint32_t *, int *);
96: int clusterfree(struct msdosfsmount *, uint32_t, uint32_t *);
97: int clusteralloc(struct msdosfsmount *, uint32_t, uint32_t, uint32_t, uint32_t *, uint32_t *);
98: int extendfile(struct denode *, uint32_t, struct buf **, uint32_t *, int);
99: int fatentry(int, struct msdosfsmount *, uint32_t, uint32_t *, uint32_t);
100: void fc_purge(struct denode *, u_int);
101: void fc_lookup(struct denode *, uint32_t, uint32_t *, uint32_t *);
102: int fillinusemap(struct msdosfsmount *);
103: int freeclusterchain(struct msdosfsmount *, uint32_t);
104: #endif /* _KERNEL */
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