msdosfsmount.h revision 1.13
1 /* $NetBSD: msdosfsmount.h,v 1.13 2007/03/04 06:03:00 christos 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 /* 54 * Arguments to mount MSDOS filesystems. 55 */ 56 struct msdosfs_args { 57 char *fspec; /* blocks special holding the fs to mount */ 58 struct export_args30 _pad1; /* compat with old userland tools */ 59 uid_t uid; /* uid that owns msdosfs files */ 60 gid_t gid; /* gid that owns msdosfs files */ 61 mode_t mask; /* mask to be applied for msdosfs perms */ 62 int flags; /* see below */ 63 64 /* Following items added after versioning support */ 65 int version; /* version of the struct */ 66 #define MSDOSFSMNT_VERSION 3 67 mode_t dirmask; /* v2: mask to be applied for msdosfs perms */ 68 int gmtoff; /* v3: offset from UTC in seconds */ 69 }; 70 71 /* 72 * Msdosfs mount options: 73 */ 74 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 75 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 76 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 77 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */ 78 #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */ 79 80 /* All flags above: */ 81 #define MSDOSFSMNT_MNTOPT \ 82 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 83 |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED) 84 85 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 86 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 87 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 88 89 #define MSDOSFSMNT_BITS "\177\20" \ 90 "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \ 91 "b\037ronly\0b\036waitonfat\0b\035fatmirror\0" 92 93 #ifdef _KERNEL 94 #include <sys/mallocvar.h> 95 MALLOC_DECLARE(M_MSDOSFSMNT); 96 97 /* 98 * Layout of the mount control block for a msdos file system. 99 */ 100 struct msdosfsmount { 101 struct mount *pm_mountp;/* vfs mount struct for this fs */ 102 dev_t pm_dev; /* block special device mounted */ 103 uid_t pm_uid; /* uid to set as owner of the files */ 104 gid_t pm_gid; /* gid to set as owner of the files */ 105 mode_t pm_mask; /* mask to and with file protection bits 106 for files */ 107 mode_t pm_dirmask; /* mask to and with file protection bits 108 for directories */ 109 int pm_gmtoff; /* offset from UTC in seconds */ 110 struct vnode *pm_devvp; /* vnode for block device mntd */ 111 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 112 u_long pm_FATsecs; /* actual number of fat sectors */ 113 u_long pm_fatblk; /* sector # of first FAT */ 114 u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */ 115 u_long pm_rootdirsize; /* size in sectors (not clusters) */ 116 u_long pm_firstcluster; /* sector number of first cluster */ 117 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 118 u_long pm_maxcluster; /* maximum cluster number */ 119 u_long pm_freeclustercount; /* number of free clusters */ 120 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 121 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 122 u_long pm_bnshift; /* shift file offset right this amount to get a sector number */ 123 u_long pm_bpcluster; /* bytes per cluster */ 124 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 125 u_long pm_fatblocksize; /* size of fat blocks in bytes */ 126 u_long pm_fatblocksec; /* size of fat blocks in sectors */ 127 u_long pm_fatsize; /* size of fat in bytes */ 128 u_long pm_fatmask; /* mask to use for fat numbers */ 129 u_long pm_fsinfo; /* fsinfo block number */ 130 u_long pm_nxtfree; /* next free cluster in fsinfo block */ 131 u_int pm_fatmult; /* these 2 values are used in fat */ 132 u_int pm_fatdiv; /* offset computation */ 133 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */ 134 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 135 u_int pm_flags; /* see below */ 136 }; 137 /* Byte offset in FAT on filesystem pmp, cluster cn */ 138 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 139 140 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 141 142 /* Number of bits in one pm_inusemap item: */ 143 #define N_INUSEBITS (8 * sizeof(u_int)) 144 145 /* 146 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 147 */ 148 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 149 #define pm_ResSectors pm_bpb.bpbResSectors 150 #define pm_FATs pm_bpb.bpbFATs 151 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 152 #define pm_Sectors pm_bpb.bpbSectors 153 #define pm_Media pm_bpb.bpbMedia 154 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 155 #define pm_Heads pm_bpb.bpbHeads 156 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 157 #define pm_HugeSectors pm_bpb.bpbHugeSectors 158 159 /* 160 * Convert pointer to buffer -> pointer to direntry 161 */ 162 #define bptoep(pmp, bp, dirofs) \ 163 ((struct direntry *)(((char *)(bp)->b_data) \ 164 + ((dirofs) & (pmp)->pm_crbomask))) 165 166 /* 167 * Convert sector number to cluster number 168 */ 169 #define de_bn2cn(pmp, bn) \ 170 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 171 172 /* 173 * Convert cluster number to sector number 174 */ 175 #define de_cn2bn(pmp, cn) \ 176 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 177 178 /* 179 * Convert sector number to kernel block number 180 */ 181 #define de_bn2kb(pmp, bn) \ 182 ((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT)) 183 184 /* 185 * Convert kernel block number to sector number 186 */ 187 #define de_kb2bn(pmp, kb) \ 188 ((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT)) 189 190 /* 191 * Convert file offset to cluster number 192 */ 193 #define de_cluster(pmp, off) \ 194 ((off) >> (pmp)->pm_cnshift) 195 196 /* 197 * Clusters required to hold size bytes 198 */ 199 #define de_clcount(pmp, size) \ 200 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 201 202 /* 203 * Convert file offset to sector number 204 */ 205 #define de_blk(pmp, off) \ 206 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 207 208 /* 209 * Convert cluster number to file offset 210 */ 211 #define de_cn2off(pmp, cn) \ 212 ((cn) << (pmp)->pm_cnshift) 213 214 /* 215 * Convert sector number to file offset 216 */ 217 #define de_bn2off(pmp, bn) \ 218 ((bn) << (pmp)->pm_bnshift) 219 /* 220 * Map a cluster number into a filesystem relative sector number. 221 */ 222 #define cntobn(pmp, cn) \ 223 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 224 225 /* 226 * Calculate sector number for directory entry in root dir, offset dirofs 227 */ 228 #define roottobn(pmp, dirofs) \ 229 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 230 231 /* 232 * Calculate sector number for directory entry at cluster dirclu, offset 233 * dirofs 234 */ 235 #define detobn(pmp, dirclu, dirofs) \ 236 ((dirclu) == MSDOSFSROOT \ 237 ? roottobn((pmp), (dirofs)) \ 238 : cntobn((pmp), (dirclu))) 239 240 /* 241 * Prototypes for MSDOSFS virtual filesystem operations 242 */ 243 void msdosfs_init(void); 244 void msdosfs_reinit(void); 245 void msdosfs_done(void); 246 247 #ifdef SYSCTL_SETUP_PROTO 248 SYSCTL_SETUP_PROTO(sysctl_vfs_msdosfs_setup); 249 #endif /* SYSCTL_SETUP_PROTO */ 250 #endif /* _KERNEL */ 251 #endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */ 252
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