1 /* $FreeBSD: src/sys/msdosfs/msdosfsmount.h,v 1.20.2.2 2000/10/27 09:45:07 bde Exp $ */
2 /* $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $ */
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
41 * This software is provided "as is".
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.
51 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_
52 #define _MSDOSFS_MSDOSFSMOUNT_H_
57 MALLOC_DECLARE(M_MSDOSFSMNT);
61 * Layout of the mount control block for a msdos file system.
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_maxcluster; /* maximum cluster number */
78 u_long pm_freeclustercount; /* number of free clusters */
79 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
80 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
81 u_long pm_bnshift; /* shift file offset right this amount to get a block number */
82 u_long pm_bpcluster; /* bytes per cluster */
83 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
84 u_long pm_fatblocksize; /* size of fat blocks in bytes */
85 u_long pm_fatblocksec; /* size of fat blocks in sectors */
86 u_long pm_fatsize; /* size of fat in bytes */
87 u_int32_t pm_fatmask; /* mask to use for fat numbers */
88 u_long pm_fsinfo; /* fsinfo block number */
89 u_long pm_nxtfree; /* next free cluster in fsinfo block */
90 u_int pm_fatmult; /* these 2 values are used in fat */
91 u_int pm_fatdiv; /* offset computation */
92 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */
93 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
94 u_int pm_flags; /* see below */
95 struct netexport pm_export; /* export information */
96 u_int16_t pm_u2w[128]; /* Local->Unicode table */
97 u_int8_t pm_ul[128]; /* Local upper->lower table */
98 u_int8_t pm_lu[128]; /* Local lower->upper table */
99 u_int8_t pm_d2u[128]; /* DOS->local table */
100 u_int8_t pm_u2d[128]; /* Local->DOS table */
102 /* Byte offset in FAT on filesystem pmp, cluster cn */
103 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
106 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
108 /* Number of bits in one pm_inusemap item: */
109 #define N_INUSEBITS (8 * sizeof(u_int))
112 * Shorthand for fields in the bpb contained in the msdosfsmount structure.
114 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec
115 #define pm_ResSectors pm_bpb.bpbResSectors
116 #define pm_FATs pm_bpb.bpbFATs
117 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts
118 #define pm_Sectors pm_bpb.bpbSectors
119 #define pm_Media pm_bpb.bpbMedia
120 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack
121 #define pm_Heads pm_bpb.bpbHeads
122 #define pm_HiddenSects pm_bpb.bpbHiddenSecs
123 #define pm_HugeSectors pm_bpb.bpbHugeSectors
126 * Convert pointer to buffer -> pointer to direntry
128 #define bptoep(pmp, bp, dirofs) \
129 ((struct direntry *)(((bp)->b_data) \
130 + ((dirofs) & (pmp)->pm_crbomask)))
133 * Convert block number to cluster number
135 #define de_bn2cn(pmp, bn) \
136 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
139 * Convert cluster number to block number
141 #define de_cn2bn(pmp, cn) \
142 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
145 * Convert file offset to cluster number
147 #define de_cluster(pmp, off) \
148 ((off) >> (pmp)->pm_cnshift)
151 * Clusters required to hold size bytes
153 #define de_clcount(pmp, size) \
154 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
157 * Convert file offset to block number
159 #define de_blk(pmp, off) \
160 (de_cn2bn(pmp, de_cluster((pmp), (off))))
163 * Convert cluster number to file offset
165 #define de_cn2off(pmp, cn) \
166 ((cn) << (pmp)->pm_cnshift)
169 * Convert block number to file offset
171 #define de_bn2off(pmp, bn) \
172 ((bn) << (pmp)->pm_bnshift)
174 * Map a cluster number into a filesystem relative block number.
176 #define cntobn(pmp, cn) \
177 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
180 * Calculate block number for directory entry in root dir, offset dirofs
182 #define roottobn(pmp, dirofs) \
183 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
186 * Calculate block number for directory entry at cluster dirclu, offset
189 #define detobn(pmp, dirclu, dirofs) \
190 ((dirclu) == MSDOSFSROOT \
191 ? roottobn((pmp), (dirofs)) \
192 : cntobn((pmp), (dirclu)))
195 * Calculate fsinfo block size
197 #define fsi_size(pmp) \
198 (1024 << ((pmp)->pm_BlkPerSec >> 2))
200 int msdosfs_init __P((struct vfsconf *vfsp));
201 int msdosfs_uninit __P((struct vfsconf *vfsp));
202 int msdosfs_mountroot __P((void));
207 * Arguments to mount MSDOS filesystems.
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 */
225 * Msdosfs mount options:
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 */
231 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */
233 #define MSDOSFSMNT_U2WTABLE 0x10 /* Local->Unicode and local<->DOS */
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 */
244 #define MSDOSFS_ARGSMAGIC 0xe4eff300
246 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */