msdosfsmount.h revision 1.16.6.3
1 /* $NetBSD: msdosfsmount.h,v 1.16.6.3 2014/08/20 00:04:26 tls 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 82 /* All flags above: */ 83 #define MSDOSFSMNT_MNTOPT \ 84 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 85 |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED) 86 87 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 88 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 89 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 90 91 #define MSDOSFSMNT_BITS "\177\20" \ 92 "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \ 93 "b\037ronly\0b\036waitonfat\0b\035fatmirror\0" 94 95 #ifdef _KERNEL 96 #include <sys/mallocvar.h> 97 #ifdef MALLOC_DECLARE 98 MALLOC_DECLARE(M_MSDOSFSMNT); 99 MALLOC_DECLARE(M_MSDOSFSTMP); 100 #endif 101 #endif 102 103 #if defined(_KERNEL) || defined(MAKEFS) 104 /* 105 * Layout of the mount control block for a MSDOSFS file system. 106 */ 107 struct msdosfsmount { 108 struct mount *pm_mountp;/* vfs mount struct for this fs */ 109 dev_t pm_dev; /* block special device mounted */ 110 uid_t pm_uid; /* uid to set as owner of the files */ 111 gid_t pm_gid; /* gid to set as owner of the files */ 112 mode_t pm_mask; /* mask to and with file protection bits 113 for files */ 114 mode_t pm_dirmask; /* mask to and with file protection bits 115 for directories */ 116 int pm_gmtoff; /* offset from UTC in seconds */ 117 struct vnode *pm_devvp; /* vnode for block device mntd */ 118 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 119 u_long pm_FATsecs; /* actual number of FAT sectors */ 120 u_long pm_fatblk; /* sector # of first FAT */ 121 u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */ 122 u_long pm_rootdirsize; /* size in sectors (not clusters) */ 123 u_long pm_firstcluster; /* sector number of first cluster */ 124 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 125 u_long pm_maxcluster; /* maximum cluster number */ 126 u_long pm_freeclustercount; /* number of free clusters */ 127 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 128 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 129 u_long pm_bnshift; /* shift file offset right this amount to get a sector number */ 130 u_long pm_bpcluster; /* bytes per cluster */ 131 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 132 u_long pm_fatblocksize; /* size of FAT blocks in bytes */ 133 u_long pm_fatblocksec; /* size of FAT blocks in sectors */ 134 u_long pm_fatsize; /* size of FAT in bytes */ 135 u_long pm_fatmask; /* mask to use for FAT numbers */ 136 u_long pm_fsinfo; /* fsinfo block number */ 137 u_long pm_nxtfree; /* next free cluster in fsinfo block */ 138 u_int pm_fatmult; /* these 2 values are used in FAT */ 139 u_int pm_fatdiv; /* offset computation */ 140 u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */ 141 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 142 u_int pm_flags; /* see below */ 143 }; 144 /* Byte offset in FAT on filesystem pmp, cluster cn */ 145 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 146 147 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 148 149 /* Number of bits in one pm_inusemap item: */ 150 #define N_INUSEBITS (8 * sizeof(u_int)) 151 152 /* 153 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 154 */ 155 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 156 #define pm_ResSectors pm_bpb.bpbResSectors 157 #define pm_FATs pm_bpb.bpbFATs 158 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 159 #define pm_Sectors pm_bpb.bpbSectors 160 #define pm_Media pm_bpb.bpbMedia 161 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 162 #define pm_Heads pm_bpb.bpbHeads 163 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 164 #define pm_HugeSectors pm_bpb.bpbHugeSectors 165 166 /* 167 * Convert pointer to buffer -> pointer to direntry 168 */ 169 #define bptoep(pmp, bp, dirofs) \ 170 ((struct direntry *)(((char *)(bp)->b_data) \ 171 + ((dirofs) & (pmp)->pm_crbomask))) 172 173 /* 174 * Convert sector number to cluster number 175 */ 176 #define de_bn2cn(pmp, bn) \ 177 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 178 179 /* 180 * Convert cluster number to sector number 181 */ 182 #define de_cn2bn(pmp, cn) \ 183 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 184 185 /* 186 * Convert sector number to kernel block number 187 */ 188 #define de_bn2kb(pmp, bn) \ 189 ((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT)) 190 191 /* 192 * Convert kernel block number to sector number 193 */ 194 #define de_kb2bn(pmp, kb) \ 195 ((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT)) 196 197 /* 198 * Convert file offset to cluster number 199 */ 200 #define de_cluster(pmp, off) \ 201 ((off) >> (pmp)->pm_cnshift) 202 203 /* 204 * Clusters required to hold size bytes 205 */ 206 #define de_clcount(pmp, size) \ 207 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 208 209 /* 210 * Convert file offset to sector number 211 */ 212 #define de_blk(pmp, off) \ 213 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 214 215 /* 216 * Convert cluster number to file offset 217 */ 218 #define de_cn2off(pmp, cn) \ 219 ((cn) << (pmp)->pm_cnshift) 220 221 /* 222 * Convert sector number to file offset 223 */ 224 #define de_bn2off(pmp, bn) \ 225 ((bn) << (pmp)->pm_bnshift) 226 /* 227 * Map a cluster number into a filesystem relative sector number. 228 */ 229 #define cntobn(pmp, cn) \ 230 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 231 232 /* 233 * Calculate sector number for directory entry in root dir, offset dirofs 234 */ 235 #define roottobn(pmp, dirofs) \ 236 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 237 238 /* 239 * Calculate sector number for directory entry at cluster dirclu, offset 240 * dirofs 241 */ 242 #define detobn(pmp, dirclu, dirofs) \ 243 ((dirclu) == MSDOSFSROOT \ 244 ? roottobn((pmp), (dirofs)) \ 245 : cntobn((pmp), (dirclu))) 246 247 /* 248 * Prototypes for MSDOSFS virtual filesystem operations 249 */ 250 void msdosfs_init(void); 251 void msdosfs_reinit(void); 252 void msdosfs_done(void); 253 254 #ifndef MAKEFS 255 VFS_PROTOS(msdosfs); 256 #endif 257 258 #endif /* _KERNEL || MAKEFS */ 259 #endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */ 260
Indexes created Wed Oct 29 09:09:48 GMT 2025