1 /* $OpenBSD: msdosfsmount.h,v 1.1 2016/10/18 17:05:30 natano Exp $ */ 2 /* $NetBSD: msdosfsmount.h,v 1.21 2016/01/30 09:59:27 mlelstv 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 55 /* 56 * Msdosfs mount options: 57 */ 58 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 59 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 60 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 61 #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */ 62 63 /* All flags above: */ 64 #define MSDOSFSMNT_MNTOPT \ 65 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 66 |MSDOSFSMNT_VERSIONED) 67 68 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 69 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 70 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 71 72 73 /* 74 * Layout of the mount control block for a MSDOSFS file system. 75 */ 76 struct msdosfsmount { 77 struct mount *pm_mountp;/* vfs mount struct for this fs */ 78 dev_t pm_dev; /* block special device mounted */ 79 uid_t pm_uid; /* uid to set as owner of the files */ 80 gid_t pm_gid; /* gid to set as owner of the files */ 81 mode_t pm_mask; /* mask to and with file protection bits 82 for files */ 83 mode_t pm_dirmask; /* mask to and with file protection bits 84 for directories */ 85 int pm_minuteswest; /* of Greenwitch */ 86 struct mkfsvnode *pm_devvp; /* mkfsvnode for block device mntd */ 87 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 88 u_long pm_FATsecs; /* actual number of FAT sectors */ 89 u_long pm_fatblk; /* sector # of first FAT */ 90 u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */ 91 u_long pm_rootdirsize; /* size in sectors (not clusters) */ 92 u_long pm_firstcluster; /* sector number of first cluster */ 93 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 94 u_long pm_maxcluster; /* maximum cluster number */ 95 u_long pm_freeclustercount; /* number of free clusters */ 96 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 97 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 98 u_long pm_bnshift; /* shift file offset right this amount to get a sector number */ 99 u_long pm_bpcluster; /* bytes per cluster */ 100 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 101 u_long pm_fatblocksize; /* size of FAT blocks in bytes */ 102 u_long pm_fatblocksec; /* size of FAT blocks in sectors */ 103 u_long pm_fatsize; /* size of FAT in bytes */ 104 u_long pm_fatmask; /* mask to use for FAT numbers */ 105 u_long pm_fsinfo; /* fsinfo block number */ 106 u_long pm_nxtfree; /* next free cluster in fsinfo block */ 107 u_int pm_fatmult; /* these 2 values are used in FAT */ 108 u_int pm_fatdiv; /* offset computation */ 109 u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */ 110 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 111 u_int pm_flags; /* see below */ 112 }; 113 /* Byte offset in FAT on filesystem pmp, cluster cn */ 114 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 115 116 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 117 118 /* Number of bits in one pm_inusemap item: */ 119 #define N_INUSEBITS (8 * sizeof(u_int)) 120 121 /* 122 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 123 */ 124 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 125 #define pm_ResSectors pm_bpb.bpbResSectors 126 #define pm_FATs pm_bpb.bpbFATs 127 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 128 #define pm_Sectors pm_bpb.bpbSectors 129 #define pm_Media pm_bpb.bpbMedia 130 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 131 #define pm_Heads pm_bpb.bpbHeads 132 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 133 #define pm_HugeSectors pm_bpb.bpbHugeSectors 134 135 /* 136 * Convert pointer to buffer -> pointer to direntry 137 */ 138 #define bptoep(pmp, bp, dirofs) \ 139 ((struct direntry *)(((char *)(bp)->b_data) \ 140 + ((dirofs) & (pmp)->pm_crbomask))) 141 142 /* 143 * Convert sector number to cluster number 144 */ 145 #define de_bn2cn(pmp, bn) \ 146 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 147 148 /* 149 * Convert cluster number to sector number 150 */ 151 #define de_cn2bn(pmp, cn) \ 152 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 153 154 /* 155 * Convert sector number to kernel block number 156 */ 157 #define de_bn2kb(pmp, bn) \ 158 ((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT)) 159 160 /* 161 * Convert kernel block number to sector number 162 */ 163 #define de_kb2bn(pmp, kb) \ 164 ((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT)) 165 166 /* 167 * Convert file offset to cluster number 168 */ 169 #define de_cluster(pmp, off) \ 170 ((off) >> (pmp)->pm_cnshift) 171 172 /* 173 * Clusters required to hold size bytes 174 */ 175 #define de_clcount(pmp, size) \ 176 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 177 178 /* 179 * Convert file offset to sector number 180 */ 181 #define de_blk(pmp, off) \ 182 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 183 184 /* 185 * Convert cluster number to file offset 186 */ 187 #define de_cn2off(pmp, cn) \ 188 ((cn) << (pmp)->pm_cnshift) 189 190 /* 191 * Convert sector number to file offset 192 */ 193 #define de_bn2off(pmp, bn) \ 194 ((bn) << (pmp)->pm_bnshift) 195 /* 196 * Map a cluster number into a filesystem relative sector number. 197 */ 198 #define cntobn(pmp, cn) \ 199 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 200 201 /* 202 * Calculate sector number for directory entry in root dir, offset dirofs 203 */ 204 #define roottobn(pmp, dirofs) \ 205 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 206 207 /* 208 * Calculate sector number for directory entry at cluster dirclu, offset 209 * dirofs 210 */ 211 #define detobn(pmp, dirclu, dirofs) \ 212 ((dirclu) == MSDOSFSROOT \ 213 ? roottobn((pmp), (dirofs)) \ 214 : cntobn((pmp), (dirclu))) 215 216 /* 217 * Prototypes for MSDOSFS virtual filesystem operations 218 */ 219 void msdosfs_init(void); 220 void msdosfs_reinit(void); 221 void msdosfs_done(void); 222 223 224 #endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */ 225