1 /* $NetBSD: msdosfsmount.h,v 1.5.2.2 2004/05/23 10:46:11 tron Exp $ */
2
3 /*-
4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
5 * Copyright (C) 1994, 1995, 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 /*
51 * Arguments to mount MSDOS filesystems.
52 */
53 struct msdosfs_args {
54 char *fspec; /* blocks special holding the fs to mount */
55 struct export_args export; /* network export information */
56 uid_t uid; /* uid that owns msdosfs files */
57 gid_t gid; /* gid that owns msdosfs files */
58 mode_t mask; /* mask to be applied for msdosfs perms */
59 int flags; /* see below */
60
61 /* Following items added after versioning support */
62 int version; /* version of the struct */
63 #define MSDOSFSMNT_VERSION 3
64 mode_t dirmask; /* v2: mask to be applied for msdosfs perms */
65 int gmtoff; /* v3: offset from UTC in seconds */
66 };
67
68 /*
69 * Msdosfs mount options:
70 */
71 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
72 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
73 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
74 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
75 #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */
76
77 /* All flags above: */
78 #define MSDOSFSMNT_MNTOPT \
79 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
80 |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
81
82 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
83 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
84 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
85
86 #define MSDOSFSMNT_BITS "\177\2" \
87 "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
88 "b\037ronly\0b\036waitonfat\0b\035fatmirror\0"
89
90 #ifdef _KERNEL
91 #include <sys/mallocvar.h>
92 MALLOC_DECLARE(M_MSDOSFSMNT);
93
94 /*
95 * Layout of the mount control block for a msdos file system.
96 */
97 struct msdosfsmount {
98 struct mount *pm_mountp;/* vfs mount struct for this fs */
99 dev_t pm_dev; /* block special device mounted */
100 uid_t pm_uid; /* uid to set as owner of the files */
101 gid_t pm_gid; /* gid to set as owner of the files */
102 mode_t pm_mask; /* mask to and with file protection bits
103 for files */
104 mode_t pm_dirmask; /* mask to and with file protection bits
105 for directories */
106 int pm_gmtoff; /* offset from UTC in seconds */
107 struct vnode *pm_devvp; /* vnode for block device mntd */
108 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
109 u_long pm_FATsecs; /* actual number of fat sectors */
110 u_long pm_fatblk; /* block # of first FAT */
111 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
112 u_long pm_rootdirsize; /* size in blocks (not clusters) */
113 u_long pm_firstcluster; /* block number of first cluster */
114 u_long pm_nmbrofclusters; /* # of clusters in filesystem */
115 u_long pm_maxcluster; /* maximum cluster number */
116 u_long pm_freeclustercount; /* number of free clusters */
117 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
118 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
119 u_long pm_bnshift; /* shift file offset right this amount to get a block number */
120 u_long pm_bpcluster; /* bytes per cluster */
121 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
122 u_long pm_fatblocksize; /* size of fat blocks in bytes */
123 u_long pm_fatblocksec; /* size of fat blocks in sectors */
124 u_long pm_fatsize; /* size of fat in bytes */
125 u_long pm_fatmask; /* mask to use for fat numbers */
126 u_long pm_fsinfo; /* fsinfo block number */
127 u_long pm_nxtfree; /* next free cluster in fsinfo block */
128 u_int pm_fatmult; /* these 2 values are used in fat */
129 u_int pm_fatdiv; /* offset computation */
130 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
131 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
132 u_int pm_flags; /* see below */
133 struct netexport pm_export; /* export information */
134 };
135 /* Byte offset in FAT on filesystem pmp, cluster cn */
136 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
137
138 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
139
140 /* Number of bits in one pm_inusemap item: */
141 #define N_INUSEBITS (8 * sizeof(u_int))
142
143 /*
144 * Shorthand for fields in the bpb contained in the msdosfsmount structure.
145 */
146 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
147 #define pm_ResSectors pm_bpb.bpbResSectors
148 #define pm_FATs pm_bpb.bpbFATs
149 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
150 #define pm_Sectors pm_bpb.bpbSectors
151 #define pm_Media pm_bpb.bpbMedia
152 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
153 #define pm_Heads pm_bpb.bpbHeads
154 #define pm_HiddenSects pm_bpb.bpbHiddenSecs
155 #define pm_HugeSectors pm_bpb.bpbHugeSectors
156
157 /*
158 * Convert pointer to buffer -> pointer to direntry
159 */
160 #define bptoep(pmp, bp, dirofs) \
161 ((struct direntry *)(((bp)->b_data) \
162 + ((dirofs) & (pmp)->pm_crbomask)))
163
164 /*
165 * Convert block number to cluster number
166 */
167 #define de_bn2cn(pmp, bn) \
168 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
169
170 /*
171 * Convert cluster number to block number
172 */
173 #define de_cn2bn(pmp, cn) \
174 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
175
176 /*
177 * Convert file offset to cluster number
178 */
179 #define de_cluster(pmp, off) \
180 ((off) >> (pmp)->pm_cnshift)
181
182 /*
183 * Clusters required to hold size bytes
184 */
185 #define de_clcount(pmp, size) \
186 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
187
188 /*
189 * Convert file offset to block number
190 */
191 #define de_blk(pmp, off) \
192 (de_cn2bn(pmp, de_cluster((pmp), (off))))
193
194 /*
195 * Convert cluster number to file offset
196 */
197 #define de_cn2off(pmp, cn) \
198 ((cn) << (pmp)->pm_cnshift)
199
200 /*
201 * Convert block number to file offset
202 */
203 #define de_bn2off(pmp, bn) \
204 ((bn) << (pmp)->pm_bnshift)
205 /*
206 * Map a cluster number into a filesystem relative block number.
207 */
208 #define cntobn(pmp, cn) \
209 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
210
211 /*
212 * Calculate block number for directory entry in root dir, offset dirofs
213 */
214 #define roottobn(pmp, dirofs) \
215 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
216
217 /*
218 * Calculate block number for directory entry at cluster dirclu, offset
219 * dirofs
220 */
221 #define detobn(pmp, dirclu, dirofs) \
222 ((dirclu) == MSDOSFSROOT \
223 ? roottobn((pmp), (dirofs)) \
224 : cntobn((pmp), (dirclu)))
225
226 /*
227 * Prototypes for MSDOSFS virtual filesystem operations
228 */
229 void msdosfs_init __P((void));
230 void msdosfs_reinit __P((void));
231 void msdosfs_done __P((void));
232
233 #ifdef SYSCTL_SETUP_PROTO
234 SYSCTL_SETUP_PROTO(sysctl_vfs_msdosfs_setup);
235 #endif /* SYSCTL_SETUP_PROTO */
236 #endif /* _KERNEL */
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