1 /* $FreeBSD: src/sys/msdosfs/msdosfsmount.h,v 1.20.2.2 2000/10/27 09:45:07 bde Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfsmount.h,v 1.7 2006/03/24 22:39:22 dillon Exp $ */ 3 /* $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_ 53 #define _MSDOSFS_MSDOSFSMOUNT_H_ 54 55 #ifdef _KERNEL 56 #ifdef MALLOC_DECLARE 57 MALLOC_DECLARE(M_MSDOSFSMNT); 58 #endif 59 #endif 60 61 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 62 63 /* 64 * Layout of the mount control block for a msdos file system. 65 */ 66 struct msdosfsmount { 67 struct mount *pm_mountp;/* vfs mount struct for this fs */ 68 dev_t pm_dev; /* block special device mounted */ 69 uid_t pm_uid; /* uid to set as owner of the files */ 70 gid_t pm_gid; /* gid to set as owner of the files */ 71 mode_t pm_mask; /* mask to and with file protection bits */ 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 32 bit 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 32 bit offset to block number 161 */ 162 #define de_blk(pmp, off) \ 163 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 164 165 /* 166 * Convert a logical cluster number to file offset. This typically 167 * represents a logical cluster number relative to a file, not relative 168 * to the device. 169 */ 170 #define de_cn2off(pmp, cn) \ 171 ((cn) << (pmp)->pm_cnshift) 172 173 /* 174 * Convert a device block number to a file offset. 175 */ 176 #define de_bn2off(pmp, bn) \ 177 ((bn) << (pmp)->pm_bnshift) 178 179 /* 180 * Convert a device block number to a 64 bit offset, used for getblk(), 181 * bread(), etc. 182 */ 183 #define de_bntodoff(pmp, bn) \ 184 ((off_t)(bn) << (pmp)->pm_bnshift) 185 186 #define de_cn2doff(pmp, cn) \ 187 ((off_t)(cn) << (pmp)->pm_cnshift) 188 189 #define de_off2bn(pmp, off) \ 190 ((daddr_t)((off) >> (pmp)->pm_bnshift)) 191 192 #define de_off2cn(pmp, off) \ 193 ((daddr_t)((off) >> (pmp)->pm_cnshift)) 194 195 /* 196 * Map an on-disk cluster number into a device relative block number or 197 * a device relative offset. This is different from a logical cluster 198 * number. The cluster numbers stored on-disk are not relative to block 0 199 * on the disk. 200 */ 201 #define xcntodoff(pmp, cn) \ 202 de_bntodoff(pmp, xcntobn(pmp, cn)) 203 204 #define xcntobn(pmp, cn) \ 205 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 206 207 208 /* 209 * Calculate block number for directory entry in root dir, offset dirofs 210 */ 211 #define roottobn(pmp, dirofs) \ 212 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 213 214 /* 215 * Calculate block number for directory entry at cluster dirclu, offset 216 * dirofs 217 */ 218 #define detobn(pmp, dirclu, dirofs) \ 219 ((dirclu) == MSDOSFSROOT \ 220 ? roottobn((pmp), (dirofs)) \ 221 : xcntobn((pmp), (dirclu))) 222 223 /* 224 * Calculate fsinfo block size 225 */ 226 #define fsi_size(pmp) \ 227 (1024 << ((pmp)->pm_BlkPerSec >> 2)) 228 229 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 230 231 #ifdef _KERNEL 232 233 int msdosfs_init (struct vfsconf *vfsp); 234 int msdosfs_uninit (struct vfsconf *vfsp); 235 int msdosfs_mountroot (void); 236 237 #endif 238 239 /* 240 * Arguments to mount MSDOS filesystems. 241 */ 242 struct msdosfs_args { 243 char *fspec; /* blocks special holding the fs to mount */ 244 struct export_args export; /* network export information */ 245 uid_t uid; /* uid that owns msdosfs files */ 246 gid_t gid; /* gid that owns msdosfs files */ 247 mode_t mask; /* mask to be applied for msdosfs perms */ 248 int flags; /* see below */ 249 int magic; /* version number */ 250 u_int16_t u2w[128]; /* Local->Unicode table */ 251 u_int8_t ul[128]; /* Local upper->lower table */ 252 u_int8_t lu[128]; /* Local lower->upper table */ 253 u_int8_t d2u[128]; /* DOS->local table */ 254 u_int8_t u2d[128]; /* Local->DOS table */ 255 }; 256 257 /* 258 * Msdosfs mount options: 259 */ 260 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 261 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 262 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 263 #ifndef __DragonFly__ 264 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */ 265 #endif 266 #define MSDOSFSMNT_U2WTABLE 0x10 /* Local->Unicode and local<->DOS */ 267 /* tables loaded */ 268 #define MSDOSFSMNT_ULTABLE 0x20 /* Local upper<->lower table loaded */ 269 /* All flags above: */ 270 #define MSDOSFSMNT_MNTOPT \ 271 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 272 /*|MSDOSFSMNT_GEMDOSFS*/|MSDOSFSMNT_U2WTABLE|MSDOSFSMNT_ULTABLE) 273 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 274 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 275 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 276 277 #define MSDOSFS_ARGSMAGIC 0xe4eff300 278 279 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */ 280