msdosfsmount.h revision 1.21
1 /* $NetBSD: msdosfsmount.h,v 1.21 2016/01/30 09:59:27 mlelstv 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 (at) 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 (at) 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 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_ 51 #define _MSDOSFS_MSDOSFSMOUNT_H_ 52 53 #ifndef MAKEFS 54 /* 55 * Arguments to mount MSDOS filesystems. 56 */ 57 struct msdosfs_args { 58 char *fspec; /* blocks special holding the fs to mount */ 59 struct export_args30 _pad1; /* compat with old userland tools */ 60 uid_t uid; /* uid that owns msdosfs files */ 61 gid_t gid; /* gid that owns msdosfs files */ 62 mode_t mask; /* mask to be applied for msdosfs perms */ 63 int flags; /* see below */ 64 65 /* Following items added after versioning support */ 66 int version; /* version of the struct */ 67 #define MSDOSFSMNT_VERSION 3 68 mode_t dirmask; /* v2: mask to be applied for msdosfs perms */ 69 int gmtoff; /* v3: offset from UTC in seconds */ 70 }; 71 #endif 72 73 /* 74 * Msdosfs mount options: 75 */ 76 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 77 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 78 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 79 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a GEMDOS-flavour */ 80 #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */ 81 #define MSDOSFSMNT_UTF8 32 /* Use UTF8 filenames */ 82 83 /* All flags above: */ 84 #define MSDOSFSMNT_MNTOPT \ 85 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 86 |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED|MSDOSFSMNT_UTF8) 87 88 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 89 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 90 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 91 92 #define MSDOSFSMNT_BITS "\177\20" \ 93 "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \ 94 "b\05utf8\0b\037ronly\0b\036waitonfat\0b\035fatmirror\0" 95 96 #ifdef _KERNEL 97 #include <sys/mallocvar.h> 98 #ifdef MALLOC_DECLARE 99 MALLOC_DECLARE(M_MSDOSFSMNT); 100 MALLOC_DECLARE(M_MSDOSFSTMP); 101 #endif 102 #endif 103 104 #if defined(_KERNEL) || defined(MAKEFS) 105 /* 106 * Layout of the mount control block for a MSDOSFS file system. 107 */ 108 struct msdosfsmount { 109 struct mount *pm_mountp;/* vfs mount struct for this fs */ 110 dev_t pm_dev; /* block special device mounted */ 111 uid_t pm_uid; /* uid to set as owner of the files */ 112 gid_t pm_gid; /* gid to set as owner of the files */ 113 mode_t pm_mask; /* mask to and with file protection bits 114 for files */ 115 mode_t pm_dirmask; /* mask to and with file protection bits 116 for directories */ 117 int pm_gmtoff; /* offset from UTC in seconds */ 118 struct vnode *pm_devvp; /* vnode for block device mntd */ 119 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 120 u_long pm_FATsecs; /* actual number of FAT sectors */ 121 u_long pm_fatblk; /* sector # of first FAT */ 122 u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */ 123 u_long pm_rootdirsize; /* size in sectors (not clusters) */ 124 u_long pm_firstcluster; /* sector number of first cluster */ 125 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 126 u_long pm_maxcluster; /* maximum cluster number */ 127 u_long pm_freeclustercount; /* number of free clusters */ 128 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 129 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 130 u_long pm_bnshift; /* shift file offset right this amount to get a sector number */ 131 u_long pm_bpcluster; /* bytes per cluster */ 132 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 133 u_long pm_fatblocksize; /* size of FAT blocks in bytes */ 134 u_long pm_fatblocksec; /* size of FAT blocks in sectors */ 135 u_long pm_fatsize; /* size of FAT in bytes */ 136 u_long pm_fatmask; /* mask to use for FAT numbers */ 137 u_long pm_fsinfo; /* fsinfo block number */ 138 u_long pm_nxtfree; /* next free cluster in fsinfo block */ 139 u_int pm_fatmult; /* these 2 values are used in FAT */ 140 u_int pm_fatdiv; /* offset computation */ 141 u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */ 142 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 143 u_int pm_flags; /* see below */ 144 }; 145 /* Byte offset in FAT on filesystem pmp, cluster cn */ 146 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 147 148 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 149 150 /* Number of bits in one pm_inusemap item: */ 151 #define N_INUSEBITS (8 * sizeof(u_int)) 152 153 /* 154 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 155 */ 156 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 157 #define pm_ResSectors pm_bpb.bpbResSectors 158 #define pm_FATs pm_bpb.bpbFATs 159 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 160 #define pm_Sectors pm_bpb.bpbSectors 161 #define pm_Media pm_bpb.bpbMedia 162 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 163 #define pm_Heads pm_bpb.bpbHeads 164 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 165 #define pm_HugeSectors pm_bpb.bpbHugeSectors 166 167 /* 168 * Convert pointer to buffer -> pointer to direntry 169 */ 170 #define bptoep(pmp, bp, dirofs) \ 171 ((struct direntry *)(((char *)(bp)->b_data) \ 172 + ((dirofs) & (pmp)->pm_crbomask))) 173 174 /* 175 * Convert sector number to cluster number 176 */ 177 #define de_bn2cn(pmp, bn) \ 178 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 179 180 /* 181 * Convert cluster number to sector number 182 */ 183 #define de_cn2bn(pmp, cn) \ 184 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 185 186 /* 187 * Convert sector number to kernel block number 188 */ 189 #define de_bn2kb(pmp, bn) \ 190 ((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT)) 191 192 /* 193 * Convert kernel block number to sector number 194 */ 195 #define de_kb2bn(pmp, kb) \ 196 ((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT)) 197 198 /* 199 * Convert file offset to cluster number 200 */ 201 #define de_cluster(pmp, off) \ 202 ((off) >> (pmp)->pm_cnshift) 203 204 /* 205 * Clusters required to hold size bytes 206 */ 207 #define de_clcount(pmp, size) \ 208 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 209 210 /* 211 * Convert file offset to sector number 212 */ 213 #define de_blk(pmp, off) \ 214 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 215 216 /* 217 * Convert cluster number to file offset 218 */ 219 #define de_cn2off(pmp, cn) \ 220 ((cn) << (pmp)->pm_cnshift) 221 222 /* 223 * Convert sector number to file offset 224 */ 225 #define de_bn2off(pmp, bn) \ 226 ((bn) << (pmp)->pm_bnshift) 227 /* 228 * Map a cluster number into a filesystem relative sector number. 229 */ 230 #define cntobn(pmp, cn) \ 231 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 232 233 /* 234 * Calculate sector number for directory entry in root dir, offset dirofs 235 */ 236 #define roottobn(pmp, dirofs) \ 237 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 238 239 /* 240 * Calculate sector number for directory entry at cluster dirclu, offset 241 * dirofs 242 */ 243 #define detobn(pmp, dirclu, dirofs) \ 244 ((dirclu) == MSDOSFSROOT \ 245 ? roottobn((pmp), (dirofs)) \ 246 : cntobn((pmp), (dirclu))) 247 248 /* 249 * Prototypes for MSDOSFS virtual filesystem operations 250 */ 251 void msdosfs_init(void); 252 void msdosfs_reinit(void); 253 void msdosfs_done(void); 254 255 #ifndef MAKEFS 256 VFS_PROTOS(msdosfs); 257 #endif 258 259 #endif /* _KERNEL || MAKEFS */ 260 #endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */ 261
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