1 /* $FreeBSD$ */
2 /* $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $ */
3
4 /*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 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 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_
52 #define _MSDOSFS_MSDOSFSMOUNT_H_
53
54 #ifdef KERNEL
55
56 #ifdef MALLOC_DECLARE
57 MALLOC_DECLARE(M_MSDOSFSMNT);
58 #endif
59
60 /*
61 * Layout of the mount control block for a msdos file system.
62 */
63 struct msdosfsmount {
64 struct mount *pm_mountp;/* vfs mount struct for this fs */
65 dev_t pm_dev; /* block special device mounted */
66 uid_t pm_uid; /* uid to set as owner of the files */
67 gid_t pm_gid; /* gid to set as owner of the files */
68 mode_t pm_mask; /* mask to and with file protection bits */
69 struct vnode *pm_devvp; /* vnode for block device mntd */
70 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
71 u_long pm_BlkPerSec; /* How many DEV_BSIZE blocks fit inside a physical sector */
72 u_long pm_FATsecs; /* actual number of fat sectors */
73 u_long pm_fatblk; /* block # of first FAT */
74 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
75 u_long pm_rootdirsize; /* size in blocks (not clusters) */
76 u_long pm_firstcluster; /* block number of first cluster */
77 u_long pm_nmbrofclusters; /* # of clusters in filesystem */
78 u_long pm_maxcluster; /* maximum cluster number */
79 u_long pm_freeclustercount; /* number of free clusters */
80 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
81 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
82 u_long pm_bnshift; /* shift file offset right this amount to get a block number */
83 u_long pm_bpcluster; /* bytes per cluster */
84 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
85 u_long pm_fatblocksize; /* size of fat blocks in bytes */
86 u_long pm_fatblocksec; /* size of fat blocks in sectors */
87 u_long pm_fatsize; /* size of fat in bytes */
88 u_int32_t pm_fatmask; /* mask to use for fat numbers */
89 u_long pm_fsinfo; /* fsinfo block number */
90 u_long pm_nxtfree; /* next free cluster in fsinfo block */
91 u_int pm_fatmult; /* these 2 values are used in fat */
92 u_int pm_fatdiv; /* offset computation */
93 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
94 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
95 u_int pm_flags; /* see below */
96 struct netexport pm_export; /* export information */
97 u_int16_t pm_u2w[128]; /* Local->Unicode table */
98 u_int8_t pm_ul[128]; /* Local upper->lower table */
99 u_int8_t pm_lu[128]; /* Local lower->upper table */
100 u_int8_t pm_d2u[128]; /* DOS->local table */
101 u_int8_t pm_u2d[128]; /* Local->DOS table */
102 };
103 /* Byte offset in FAT on filesystem pmp, cluster cn */
104 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
105
106
107 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
108
109 /* Number of bits in one pm_inusemap item: */
110 #define N_INUSEBITS (8 * sizeof(u_int))
111
112 /*
113 * Shorthand for fields in the bpb contained in the msdosfsmount structure.
114 */
115 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
116 #define pm_ResSectors pm_bpb.bpbResSectors
117 #define pm_FATs pm_bpb.bpbFATs
118 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
119 #define pm_Sectors pm_bpb.bpbSectors
120 #define pm_Media pm_bpb.bpbMedia
121 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
122 #define pm_Heads pm_bpb.bpbHeads
123 #define pm_HiddenSects pm_bpb.bpbHiddenSecs
124 #define pm_HugeSectors pm_bpb.bpbHugeSectors
125
126 /*
127 * Convert pointer to buffer -> pointer to direntry
128 */
129 #define bptoep(pmp, bp, dirofs) \
130 ((struct direntry *)(((bp)->b_data) \
131 + ((dirofs) & (pmp)->pm_crbomask)))
132
133 /*
134 * Convert block number to cluster number
135 */
136 #define de_bn2cn(pmp, bn) \
137 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
138
139 /*
140 * Convert cluster number to block number
141 */
142 #define de_cn2bn(pmp, cn) \
143 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
144
145 /*
146 * Convert file offset to cluster number
147 */
148 #define de_cluster(pmp, off) \
149 ((off) >> (pmp)->pm_cnshift)
150
151 /*
152 * Clusters required to hold size bytes
153 */
154 #define de_clcount(pmp, size) \
155 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
156
157 /*
158 * Convert file offset to block number
159 */
160 #define de_blk(pmp, off) \
161 (de_cn2bn(pmp, de_cluster((pmp), (off))))
162
163 /*
164 * Convert cluster number to file offset
165 */
166 #define de_cn2off(pmp, cn) \
167 ((cn) << (pmp)->pm_cnshift)
168
169 /*
170 * Convert block number to file offset
171 */
172 #define de_bn2off(pmp, bn) \
173 ((bn) << (pmp)->pm_bnshift)
174 /*
175 * Map a cluster number into a filesystem relative block number.
176 */
177 #define cntobn(pmp, cn) \
178 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
179
180 /*
181 * Calculate block number for directory entry in root dir, offset dirofs
182 */
183 #define roottobn(pmp, dirofs) \
184 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
185
186 /*
187 * Calculate block number for directory entry at cluster dirclu, offset
188 * dirofs
189 */
190 #define detobn(pmp, dirclu, dirofs) \
191 ((dirclu) == MSDOSFSROOT \
192 ? roottobn((pmp), (dirofs)) \
193 : cntobn((pmp), (dirclu)))
194
195 /*
196 * Calculate fsinfo block size
197 */
198 #define fsi_size(pmp) \
199 (1024 << ((pmp)->pm_BlkPerSec >> 2))
200
201 int msdosfs_init __P((struct vfsconf *vfsp));
202 int msdosfs_mountroot __P((void));
203
204 #endif /* KERNEL */
205
206 /*
207 * Arguments to mount MSDOS filesystems.
208 */
209 struct msdosfs_args {
210 char *fspec; /* blocks special holding the fs to mount */
211 struct export_args export; /* network export information */
212 uid_t uid; /* uid that owns msdosfs files */
213 gid_t gid; /* gid that owns msdosfs files */
214 mode_t mask; /* mask to be applied for msdosfs perms */
215 int flags; /* see below */
216 int magic; /* version number */
217 u_int16_t u2w[128]; /* Local->Unicode table */
218 u_int8_t ul[128]; /* Local upper->lower table */
219 u_int8_t lu[128]; /* Local lower->upper table */
220 u_int8_t d2u[128]; /* DOS->local table */
221 u_int8_t u2d[128]; /* Local->DOS table */
222 };
223
224 /*
225 * Msdosfs mount options:
226 */
227 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
228 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
229 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
230 #ifndef __FreeBSD__
231 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
232 #endif
233 #define MSDOSFSMNT_U2WTABLE 0x10 /* Local->Unicode and local<->DOS */
234 /* tables loaded */
235 #define MSDOSFSMNT_ULTABLE 0x20 /* Local upper<->lower table loaded */
236 /* All flags above: */
237 #define MSDOSFSMNT_MNTOPT \
238 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
239 /*|MSDOSFSMNT_GEMDOSFS*/|MSDOSFSMNT_U2WTABLE|MSDOSFSMNT_ULTABLE)
240 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
241 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
242 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
243
244 #define MSDOSFS_ARGSMAGIC 0xe4eff300
245
246 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */
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