msdosfsmount.h revision 1.5
1 /* $NetBSD: msdosfsmount.h,v 1.5 2003/10/03 16:34:31 yamt 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 /* 51 * Arguments to mount MSDOS filesystems. 52 */ 53 struct msdosfs_args { 54 char *fspec; /* blocks special holding the fs to mount */ 55 struct export_args export; /* network export information */ 56 uid_t uid; /* uid that owns msdosfs files */ 57 gid_t gid; /* gid that owns msdosfs files */ 58 mode_t mask; /* mask to be applied for msdosfs perms */ 59 int gmtoff; /* offset from UTC in seconds */ 60 int flags; /* see below */ 61 62 /* Following items added after versioning support */ 63 int version; /* version of the struct */ 64 #define MSDOSFSMNT_VERSION 2 65 mode_t dirmask; /* v2: mask to be applied for msdosfs perms */ 66 }; 67 68 /* 69 * Msdosfs mount options: 70 */ 71 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 72 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 73 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 74 #define MSDOSFSMNT_GEMDOSFS 8 /* This is a gemdos-flavour */ 75 #define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */ 76 77 /* All flags above: */ 78 #define MSDOSFSMNT_MNTOPT \ 79 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 80 |MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED) 81 82 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 83 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 84 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 85 86 #define MSDOSFSMNT_BITS "\177\20" \ 87 "b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \ 88 "b\037ronly\0b\036waitonfat\0b\035fatmirror\0" 89 90 #ifdef _KERNEL 91 #include <sys/mallocvar.h> 92 MALLOC_DECLARE(M_MSDOSFSMNT); 93 94 /* 95 * Layout of the mount control block for a msdos file system. 96 */ 97 struct msdosfsmount { 98 struct mount *pm_mountp;/* vfs mount struct for this fs */ 99 dev_t pm_dev; /* block special device mounted */ 100 uid_t pm_uid; /* uid to set as owner of the files */ 101 gid_t pm_gid; /* gid to set as owner of the files */ 102 mode_t pm_mask; /* mask to and with file protection bits 103 for files */ 104 mode_t pm_dirmask; /* mask to and with file protection bits 105 for directories */ 106 int pm_gmtoff; /* offset from UTC in seconds */ 107 struct vnode *pm_devvp; /* vnode for block device mntd */ 108 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 109 u_long pm_FATsecs; /* actual number of fat sectors */ 110 u_long pm_fatblk; /* block # of first FAT */ 111 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */ 112 u_long pm_rootdirsize; /* size in blocks (not clusters) */ 113 u_long pm_firstcluster; /* block number of first cluster */ 114 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 115 u_long pm_maxcluster; /* maximum cluster number */ 116 u_long pm_freeclustercount; /* number of free clusters */ 117 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 118 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 119 u_long pm_bnshift; /* shift file offset right this amount to get a block number */ 120 u_long pm_bpcluster; /* bytes per cluster */ 121 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 122 u_long pm_fatblocksize; /* size of fat blocks in bytes */ 123 u_long pm_fatblocksec; /* size of fat blocks in sectors */ 124 u_long pm_fatsize; /* size of fat in bytes */ 125 u_long pm_fatmask; /* mask to use for fat numbers */ 126 u_long pm_fsinfo; /* fsinfo block number */ 127 u_long pm_nxtfree; /* next free cluster in fsinfo block */ 128 u_int pm_fatmult; /* these 2 values are used in fat */ 129 u_int pm_fatdiv; /* offset computation */ 130 u_int pm_curfat; /* current fat for FAT32 (0 otherwise) */ 131 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 132 u_int pm_flags; /* see below */ 133 struct netexport pm_export; /* export information */ 134 }; 135 /* Byte offset in FAT on filesystem pmp, cluster cn */ 136 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 137 138 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 139 140 /* Number of bits in one pm_inusemap item: */ 141 #define N_INUSEBITS (8 * sizeof(u_int)) 142 143 /* 144 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 145 */ 146 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 147 #define pm_ResSectors pm_bpb.bpbResSectors 148 #define pm_FATs pm_bpb.bpbFATs 149 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 150 #define pm_Sectors pm_bpb.bpbSectors 151 #define pm_Media pm_bpb.bpbMedia 152 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 153 #define pm_Heads pm_bpb.bpbHeads 154 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 155 #define pm_HugeSectors pm_bpb.bpbHugeSectors 156 157 /* 158 * Convert pointer to buffer -> pointer to direntry 159 */ 160 #define bptoep(pmp, bp, dirofs) \ 161 ((struct direntry *)(((bp)->b_data) \ 162 + ((dirofs) & (pmp)->pm_crbomask))) 163 164 /* 165 * Convert block number to cluster number 166 */ 167 #define de_bn2cn(pmp, bn) \ 168 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 169 170 /* 171 * Convert cluster number to block number 172 */ 173 #define de_cn2bn(pmp, cn) \ 174 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 175 176 /* 177 * Convert file offset to cluster number 178 */ 179 #define de_cluster(pmp, off) \ 180 ((off) >> (pmp)->pm_cnshift) 181 182 /* 183 * Clusters required to hold size bytes 184 */ 185 #define de_clcount(pmp, size) \ 186 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 187 188 /* 189 * Convert file offset to block number 190 */ 191 #define de_blk(pmp, off) \ 192 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 193 194 /* 195 * Convert cluster number to file offset 196 */ 197 #define de_cn2off(pmp, cn) \ 198 ((cn) << (pmp)->pm_cnshift) 199 200 /* 201 * Convert block number to file offset 202 */ 203 #define de_bn2off(pmp, bn) \ 204 ((bn) << (pmp)->pm_bnshift) 205 /* 206 * Map a cluster number into a filesystem relative block number. 207 */ 208 #define cntobn(pmp, cn) \ 209 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 210 211 /* 212 * Calculate block number for directory entry in root dir, offset dirofs 213 */ 214 #define roottobn(pmp, dirofs) \ 215 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 216 217 /* 218 * Calculate block number for directory entry at cluster dirclu, offset 219 * dirofs 220 */ 221 #define detobn(pmp, dirclu, dirofs) \ 222 ((dirclu) == MSDOSFSROOT \ 223 ? roottobn((pmp), (dirofs)) \ 224 : cntobn((pmp), (dirclu))) 225 226 /* 227 * Prototypes for MSDOSFS virtual filesystem operations 228 */ 229 void msdosfs_init __P((void)); 230 void msdosfs_reinit __P((void)); 231 void msdosfs_done __P((void)); 232 233 #endif /* _KERNEL */ 234
Indexes created Tue Sep 30 11:09:46 GMT 2025