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 for files */
70 mode_t pm_dirmask; /* mask to and with file protection bits
71 for directories */
72 struct vnode *pm_devvp; /* vnode for block device mntd */
73 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
74 u_long pm_BlkPerSec; /* How many DEV_BSIZE blocks fit inside a physical sector */
75 u_long pm_FATsecs; /* actual number of fat sectors */
76 u_long pm_fatblk; /* block # of first FAT */
77 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
78 u_long pm_rootdirsize; /* size in blocks (not clusters) */
79 u_long pm_firstcluster; /* block number of first cluster */
80 u_long pm_maxcluster; /* maximum cluster number */
81 u_long pm_freeclustercount; /* number of free clusters */
82 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
83 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
84 u_long pm_bnshift; /* shift file offset right this amount to get a block number */
85 u_long pm_bpcluster; /* bytes per cluster */
86 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
87 u_long pm_fatblocksize; /* size of fat blocks in bytes */
88 u_long pm_fatblocksec; /* size of fat blocks in sectors */
89 u_long pm_fatsize; /* size of fat in bytes */
90 u_int32_t pm_fatmask; /* mask to use for fat numbers */
91 u_long pm_fsinfo; /* fsinfo block number */
92 u_long pm_nxtfree; /* next free cluster in fsinfo block */
93 u_int pm_fatmult; /* these 2 values are used in fat */
94 u_int pm_fatdiv; /* offset computation */
95 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
96 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
97 u_int pm_flags; /* see below */
98 struct netexport pm_export; /* export information */
99 u_int16_t pm_u2w[128]; /* Local->Unicode table */
100 u_int8_t pm_ul[128]; /* Local upper->lower table */
101 u_int8_t pm_lu[128]; /* Local lower->upper table */
102 u_int8_t pm_d2u[128]; /* DOS->local table */
103 u_int8_t pm_u2d[128]; /* Local->DOS table */
104 };
105 /* Byte offset in FAT on filesystem pmp, cluster cn */
106 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
107
108
109 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
110
111 /* Number of bits in one pm_inusemap item: */
112 #define N_INUSEBITS (8 * sizeof(u_int))
113
114 /*
115 * Shorthand for fields in the bpb contained in the msdosfsmount structure.
116 */
117 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
118 #define pm_ResSectors pm_bpb.bpbResSectors
119 #define pm_FATs pm_bpb.bpbFATs
120 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
121 #define pm_Sectors pm_bpb.bpbSectors
122 #define pm_Media pm_bpb.bpbMedia
123 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
124 #define pm_Heads pm_bpb.bpbHeads
125 #define pm_HiddenSects pm_bpb.bpbHiddenSecs
126 #define pm_HugeSectors pm_bpb.bpbHugeSectors
127
128 /*
129 * Convert pointer to buffer -> pointer to direntry
130 */
131 #define bptoep(pmp, bp, dirofs) \
132 ((struct direntry *)(((bp)->b_data) \
133 + ((dirofs) & (pmp)->pm_crbomask)))
134
135 /*
136 * Convert block number to cluster number
137 */
138 #define de_bn2cn(pmp, bn) \
139 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
140
141 /*
142 * Convert cluster number to block number
143 */
144 #define de_cn2bn(pmp, cn) \
145 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
146
147 /*
148 * Convert file offset to cluster number
149 */
150 #define de_cluster(pmp, off) \
151 ((off) >> (pmp)->pm_cnshift)
152
153 /*
154 * Clusters required to hold size bytes
155 */
156 #define de_clcount(pmp, size) \
157 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
158
159 /*
160 * Convert file offset to block number
161 */
162 #define de_blk(pmp, off) \
163 (de_cn2bn(pmp, de_cluster((pmp), (off))))
164
165 /*
166 * Convert cluster number to file offset
167 */
168 #define de_cn2off(pmp, cn) \
169 ((cn) << (pmp)->pm_cnshift)
170
171 /*
172 * Convert block number to file offset
173 */
174 #define de_bn2off(pmp, bn) \
175 ((bn) << (pmp)->pm_bnshift)
176 /*
177 * Map a cluster number into a filesystem relative block number.
178 */
179 #define cntobn(pmp, cn) \
180 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
181
182 /*
183 * Calculate block number for directory entry in root dir, offset dirofs
184 */
185 #define roottobn(pmp, dirofs) \
186 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
187
188 /*
189 * Calculate block number for directory entry at cluster dirclu, offset
190 * dirofs
191 */
192 #define detobn(pmp, dirclu, dirofs) \
193 ((dirclu) == MSDOSFSROOT \
194 ? roottobn((pmp), (dirofs)) \
195 : cntobn((pmp), (dirclu)))
196
197 /*
198 * Calculate fsinfo block size
199 */
200 #define fsi_size(pmp) \
201 (1024 << ((pmp)->pm_BlkPerSec >> 2))
202
203 int msdosfs_init __P((struct vfsconf *vfsp));
204 int msdosfs_uninit __P((struct vfsconf *vfsp));
205 int msdosfs_mountroot __P((void));
206
207 #endif /* _KERNEL */
208
209 /*
210 * Arguments to mount MSDOS filesystems.
211 */
212 struct msdosfs_args {
213 char *fspec; /* blocks special holding the fs to mount */
214 struct export_args export; /* network export information */
215 uid_t uid; /* uid that owns msdosfs files */
216 gid_t gid; /* gid that owns msdosfs files */
217 mode_t mask; /* file mask to be applied for msdosfs perms */
218 mode_t dirmask; /* dir mask to be applied for msdosfs perms */
219 int flags; /* see below */
220 int magic; /* version number */
221 u_int16_t u2w[128]; /* Local->Unicode table */
222 u_int8_t ul[128]; /* Local upper->lower table */
223 u_int8_t lu[128]; /* Local lower->upper table */
224 u_int8_t d2u[128]; /* DOS->local table */
225 u_int8_t u2d[128]; /* Local->DOS table */
226 };
227
228 /*
229 * Msdosfs mount options:
230 */
231 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
232 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
233 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
234 #ifndef __FreeBSD__
235 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
236 #endif
237 #define MSDOSFSMNT_U2WTABLE 0x10 /* Local->Unicode and local<->DOS */
238 /* tables loaded */
239 #define MSDOSFSMNT_ULTABLE 0x20 /* Local upper<->lower table loaded */
240 /* All flags above: */
241 #define MSDOSFSMNT_MNTOPT \
242 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
243 /*|MSDOSFSMNT_GEMDOSFS*/|MSDOSFSMNT_U2WTABLE|MSDOSFSMNT_ULTABLE)
244 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
245 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
246 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
247
248 #define MSDOSFS_ARGSMAGIC 0xe4eff300
249
250 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */
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