1 /* $FreeBSD$ */
2 /* $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-4-Clause
6 *
7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
9 * All rights reserved.
10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by TooLs GmbH.
23 * 4. The name of TooLs GmbH may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37 /*-
38 * Written by Paul Popelka (paulp@uts.amdahl.com)
39 *
40 * You can do anything you want with this software, just don't say you wrote
41 * it, and don't remove this notice.
42 *
43 * This software is provided "as is".
44 *
45 * The author supplies this software to be publicly redistributed on the
46 * understanding that the author is not responsible for the correct
47 * functioning of this software in any circumstances and is not liable for
48 * any damages caused by this software.
49 *
50 * October 1992
51 */
52
53 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_
54 #define _MSDOSFS_MSDOSFSMOUNT_H_
55
56 #if defined (_KERNEL) || defined(MAKEFS)
57
58 #include <sys/types.h>
59 #ifndef MAKEFS
60 #include <sys/lock.h>
61 #include <sys/lockmgr.h>
62 #endif
63 #include <sys/tree.h>
64
65 #ifdef MALLOC_DECLARE
66 MALLOC_DECLARE(M_MSDOSFSMNT);
67 #endif
68
69 struct msdosfs_fileno;
70
71 /*
72 * Layout of the mount control block for a MSDOSFS filesystem.
73 */
74 struct msdosfsmount {
75 struct mount *pm_mountp;/* vfs mount struct for this fs */
76 struct g_consumer *pm_cp;
77 struct bufobj *pm_bo;
78 uid_t pm_uid; /* uid to set as owner of the files */
79 gid_t pm_gid; /* gid to set as owner of the files */
80 mode_t pm_mask; /* mask to and with file protection bits
81 for files */
82 mode_t pm_dirmask; /* mask to and with file protection bits
83 for directories */
84 struct vnode *pm_devvp; /* vnode for character device mounted */
85 struct cdev *pm_dev; /* character device mounted */
86 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
87 u_long pm_BlkPerSec; /* How many DEV_BSIZE blocks fit inside a physical sector */
88 u_long pm_FATsecs; /* actual number of FAT sectors */
89 u_long pm_fatblk; /* block # of first FAT */
90 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
91 u_long pm_rootdirsize; /* size in blocks (not clusters) */
92 u_long pm_firstcluster; /* block number of first cluster */
93 u_long pm_maxcluster; /* maximum cluster number */
94 u_long pm_freeclustercount; /* number of free clusters */
95 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
96 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
97 u_long pm_bnshift; /* shift file offset right this amount to get a block number */
98 u_long pm_bpcluster; /* bytes per cluster */
99 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
100 u_long pm_fatblocksize; /* size of FAT blocks in bytes */
101 u_long pm_fatblocksec; /* size of FAT blocks in sectors */
102 u_long pm_fatsize; /* size of FAT in bytes */
103 uint32_t pm_fatmask; /* mask to use for FAT numbers */
104 u_long pm_fsinfo; /* fsinfo block number */
105 u_long pm_nxtfree; /* next place to search for a free cluster */
106 u_int pm_fatmult; /* these 2 values are used in FAT */
107 u_int pm_fatdiv; /* offset computation */
108 u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */
109 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
110 uint64_t pm_flags; /* see below */
111 void *pm_u2w; /* Local->Unicode iconv handle */
112 void *pm_w2u; /* Unicode->Local iconv handle */
113 void *pm_u2d; /* Unicode->DOS iconv handle */
114 void *pm_d2u; /* DOS->Local iconv handle */
115 #ifndef MAKEFS
116 struct lock pm_fatlock; /* lockmgr protecting allocations */
117 struct lock pm_checkpath_lock; /* protects doscheckpath result */
118 #endif
119 };
120
121 /*
122 * A 64-bit file number and the 32-bit file number to which it is mapped,
123 * in a red-black tree node.
124 */
125 struct msdosfs_fileno {
126 RB_ENTRY(msdosfs_fileno) mf_tree;
127 uint32_t mf_fileno32;
128 uint64_t mf_fileno64;
129 };
130
131 /* Byte offset in FAT on filesystem pmp, cluster cn */
132 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
133
134 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
135
136 /* Number of bits in one pm_inusemap item: */
137 #define N_INUSEBITS (8 * sizeof(u_int))
138
139 /*
140 * Shorthand for fields in the bpb contained in the msdosfsmount structure.
141 */
142 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
143 #define pm_ResSectors pm_bpb.bpbResSectors
144 #define pm_FATs pm_bpb.bpbFATs
145 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
146 #define pm_Sectors pm_bpb.bpbSectors
147 #define pm_Media pm_bpb.bpbMedia
148 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
149 #define pm_Heads pm_bpb.bpbHeads
150 #define pm_HiddenSects pm_bpb.bpbHiddenSecs
151 #define pm_HugeSectors pm_bpb.bpbHugeSectors
152
153 /*
154 * Convert pointer to buffer -> pointer to direntry
155 */
156 #define bptoep(pmp, bp, dirofs) \
157 ((struct direntry *)(((bp)->b_data) \
158 + ((dirofs) & (pmp)->pm_crbomask)))
159
160 /*
161 * Convert block number to cluster number
162 */
163 #define de_bn2cn(pmp, bn) \
164 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
165
166 /*
167 * Convert cluster number to block number
168 */
169 #define de_cn2bn(pmp, cn) \
170 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
171
172 /*
173 * Convert file offset to cluster number
174 */
175 #define de_cluster(pmp, off) \
176 ((off) >> (pmp)->pm_cnshift)
177
178 /*
179 * Clusters required to hold size bytes
180 */
181 #define de_clcount(pmp, size) \
182 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
183
184 /*
185 * Convert file offset to block number
186 */
187 #define de_blk(pmp, off) \
188 (de_cn2bn(pmp, de_cluster((pmp), (off))))
189
190 /*
191 * Convert cluster number to file offset
192 */
193 #define de_cn2off(pmp, cn) \
194 ((cn) << (pmp)->pm_cnshift)
195
196 /*
197 * Convert block number to file offset
198 */
199 #define de_bn2off(pmp, bn) \
200 ((bn) << (pmp)->pm_bnshift)
201 /*
202 * Map a cluster number into a filesystem relative block number.
203 */
204 #define cntobn(pmp, cn) \
205 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
206
207 /*
208 * Calculate block number for directory entry in root dir, offset dirofs
209 */
210 #define roottobn(pmp, dirofs) \
211 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
212
213 /*
214 * Calculate block number for directory entry at cluster dirclu, offset
215 * dirofs
216 */
217 #define detobn(pmp, dirclu, dirofs) \
218 ((dirclu) == MSDOSFSROOT \
219 ? roottobn((pmp), (dirofs)) \
220 : cntobn((pmp), (dirclu)))
221
222 #define MSDOSFS_LOCK_MP(pmp) \
223 lockmgr(&(pmp)->pm_fatlock, LK_EXCLUSIVE, NULL)
224 #define MSDOSFS_UNLOCK_MP(pmp) \
225 lockmgr(&(pmp)->pm_fatlock, LK_RELEASE, NULL)
226 #define MSDOSFS_ASSERT_MP_LOCKED(pmp) \
227 lockmgr_assert(&(pmp)->pm_fatlock, KA_XLOCKED)
228
229 #endif /* _KERNEL || MAKEFS */
230
231 #ifndef MAKEFS
232 /*
233 * Arguments to mount MSDOS filesystems.
234 */
235 struct msdosfs_args {
236 char *fspec; /* blocks special holding the fs to mount */
237 struct oexport_args export; /* network export information */
238 uid_t uid; /* uid that owns msdosfs files */
239 gid_t gid; /* gid that owns msdosfs files */
240 mode_t mask; /* file mask to be applied for msdosfs perms */
241 int flags; /* see below */
242 int unused1; /* unused, was version number */
243 uint16_t unused2[128]; /* no longer used, was Local->Unicode table */
244 char *cs_win; /* Windows(Unicode) Charset */
245 char *cs_dos; /* DOS Charset */
246 char *cs_local; /* Local Charset */
247 mode_t dirmask; /* dir mask to be applied for msdosfs perms */
248 };
249 #endif /* MAKEFS */
250
251 /*
252 * Msdosfs mount options:
253 */
254 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
255 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
256 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
257 #define MSDOSFSMNT_KICONV 0x10 /* Use libiconv to convert chars */
258 /* All flags above: */
259 #define MSDOSFSMNT_MNTOPT \
260 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
261 |MSDOSFSMNT_KICONV)
262 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
263 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
264 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
265 #define MSDOSFS_FSIMOD 0x01000000
266
267 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */
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