1 | /* $NetBSD: fat.h,v 1.9 2014/10/18 08:33:28 snj Exp $ */ |
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 | |
50 | #ifndef _MSDOSFS_FAT_H_ |
51 | #define _MSDOSFS_FAT_H_ |
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: |
71 | * Return true if filesystem uses 12 bit FATs. Microsoft Programmer's |
72 | * Reference says if the maximum cluster number in a filesystem is greater |
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 |
75 | * in pm_fatentrysize. |
76 | * GEMDOS-flavour (atari): |
77 | * If the filesystem is on floppy we've got a 12 bit FAT filesystem, otherwise |
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 | /* |
87 | * M$ in its unlimited wisdom decided that EOF mark is anything |
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. |
91 | */ |
92 | #define MSDOSFSEOF(cn, fatmask) \ |
93 | (((cn) & CLUST_EOFS) == (CLUST_EOFS & (fatmask))) |
94 | |
95 | #if defined(_KERNEL) || defined(MAKEFS) |
96 | /* |
97 | * These are the values for the function argument to the function |
98 | * fatentry(). |
99 | */ |
100 | #define FAT_GET 0x0001 /* get a FAT entry */ |
101 | #define FAT_SET 0x0002 /* set a FAT entry */ |
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 | |
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); |
118 | #endif /* _KERNEL || MAKEFS */ |
119 | #endif /* _MSDOSFS_FAT_H_ */ |
120 | |