1 /* $NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /*- 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #ifndef _MSDOSFS_MSDOSFSMOUNT_H_ 53 #define _MSDOSFS_MSDOSFSMOUNT_H_ 54 55 #if defined (_KERNEL) || defined(MAKEFS) 56 57 #include <sys/types.h> 58 #ifndef MAKEFS 59 #include <sys/lock.h> 60 #include <sys/lockmgr.h> 61 #include <sys/_task.h> 62 #endif 63 #include <sys/tree.h> 64 65 #ifdef MALLOC_DECLARE 66 MALLOC_DECLARE(M_MSDOSFSMNT); 67 #endif 68 69 struct msdosfs_fileno; 70 71 /* 72 * Layout of the mount control block for a MSDOSFS filesystem. 73 */ 74 struct msdosfsmount { 75 struct mount *pm_mountp;/* vfs mount struct for this fs */ 76 struct g_consumer *pm_cp; 77 struct bufobj *pm_bo; 78 uid_t pm_uid; /* uid to set as owner of the files */ 79 gid_t pm_gid; /* gid to set as owner of the files */ 80 mode_t pm_mask; /* mask to and with file protection bits 81 for files */ 82 mode_t pm_dirmask; /* mask to and with file protection bits 83 for directories */ 84 struct vnode *pm_devvp; /* vnode for character device mounted */ 85 struct vnode *pm_odevvp;/* real devfs vnode */ 86 struct cdev *pm_dev; /* character device mounted */ 87 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 88 u_long pm_BlkPerSec; /* How many DEV_BSIZE blocks fit inside a physical sector */ 89 u_long pm_FATsecs; /* actual number of FAT sectors */ 90 u_long pm_fatblk; /* block # of first FAT */ 91 u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */ 92 u_long pm_rootdirsize; /* size in blocks (not clusters) */ 93 u_long pm_firstcluster; /* block number of first cluster */ 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 block 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 uint32_t pm_fatmask; /* mask to use for FAT numbers */ 105 u_long pm_fsinfo; /* fsinfo block number */ 106 u_long pm_nxtfree; /* next place to search for a free cluster */ 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 int pm_rootdirfree; /* number of free slots in FAT12/16 root directory */ 111 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 112 uint64_t pm_flags; /* see below */ 113 void *pm_u2w; /* Local->Unicode iconv handle */ 114 void *pm_w2u; /* Unicode->Local iconv handle */ 115 void *pm_u2d; /* Unicode->DOS iconv handle */ 116 void *pm_d2u; /* DOS->Local iconv handle */ 117 #ifndef MAKEFS 118 struct lock pm_fatlock; /* lockmgr protecting allocations */ 119 struct lock pm_checkpath_lock; /* protects doscheckpath result */ 120 struct task pm_rw2ro_task; /* context for emergency remount ro */ 121 #endif 122 }; 123 124 /* 125 * A 64-bit file number and the 32-bit file number to which it is mapped, 126 * in a red-black tree node. 127 */ 128 struct msdosfs_fileno { 129 RB_ENTRY(msdosfs_fileno) mf_tree; 130 uint32_t mf_fileno32; 131 uint64_t mf_fileno64; 132 }; 133 134 /* Byte offset in FAT on filesystem pmp, cluster cn */ 135 #define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv) 136 137 #define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data) 138 139 /* Number of bits in one pm_inusemap item: */ 140 #define N_INUSEBITS (8 * sizeof(u_int)) 141 142 /* 143 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 144 */ 145 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 146 #define pm_ResSectors pm_bpb.bpbResSectors 147 #define pm_FATs pm_bpb.bpbFATs 148 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 149 #define pm_Sectors pm_bpb.bpbSectors 150 #define pm_Media pm_bpb.bpbMedia 151 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 152 #define pm_Heads pm_bpb.bpbHeads 153 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 154 #define pm_HugeSectors pm_bpb.bpbHugeSectors 155 156 /* 157 * Convert pointer to buffer -> pointer to direntry 158 */ 159 #define bptoep(pmp, bp, dirofs) \ 160 ((struct direntry *)(((bp)->b_data) \ 161 + ((dirofs) & (pmp)->pm_crbomask))) 162 163 /* 164 * Convert block number to cluster number 165 */ 166 #define de_bn2cn(pmp, bn) \ 167 ((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 168 169 /* 170 * Convert cluster number to block number 171 */ 172 #define de_cn2bn(pmp, cn) \ 173 ((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift)) 174 175 /* 176 * Convert file offset to cluster number 177 */ 178 #define de_cluster(pmp, off) \ 179 ((off) >> (pmp)->pm_cnshift) 180 181 /* 182 * Clusters required to hold size bytes 183 */ 184 #define de_clcount(pmp, size) \ 185 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 186 187 /* 188 * Convert file offset to block number 189 */ 190 #define de_blk(pmp, off) \ 191 (de_cn2bn(pmp, de_cluster((pmp), (off)))) 192 193 /* 194 * Convert cluster number to file offset 195 */ 196 #define de_cn2off(pmp, cn) \ 197 ((cn) << (pmp)->pm_cnshift) 198 199 /* 200 * Convert block number to file offset 201 */ 202 #define de_bn2off(pmp, bn) \ 203 ((bn) << (pmp)->pm_bnshift) 204 /* 205 * Map a cluster number into a filesystem relative block number. 206 */ 207 #define cntobn(pmp, cn) \ 208 (de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster) 209 210 /* 211 * Calculate block number for directory entry in root dir, offset dirofs 212 */ 213 #define roottobn(pmp, dirofs) \ 214 (de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk) 215 216 /* 217 * Calculate block number for directory entry at cluster dirclu, offset 218 * dirofs 219 */ 220 #define detobn(pmp, dirclu, dirofs) \ 221 ((dirclu) == MSDOSFSROOT \ 222 ? roottobn((pmp), (dirofs)) \ 223 : cntobn((pmp), (dirclu))) 224 225 /* 226 * Increment the number of used entries in a fixed size FAT12/16 root 227 * directory 228 */ 229 #define rootde_alloced(dep) \ 230 if ((dep)->de_StartCluster == MSDOSFSROOT) \ 231 (dep)->de_pmp->pm_rootdirfree--; 232 233 /* 234 * Decrement the number of used entries in a fixed size FAT12/16 root 235 * directory 236 */ 237 #define rootde_freed(dep) \ 238 if ((dep)->de_StartCluster == MSDOSFSROOT) \ 239 (dep)->de_pmp->pm_rootdirfree++; 240 241 #define MSDOSFS_LOCK_MP(pmp) \ 242 lockmgr(&(pmp)->pm_fatlock, LK_EXCLUSIVE, NULL) 243 #define MSDOSFS_UNLOCK_MP(pmp) \ 244 lockmgr(&(pmp)->pm_fatlock, LK_RELEASE, NULL) 245 #define MSDOSFS_ASSERT_MP_LOCKED(pmp) \ 246 lockmgr_assert(&(pmp)->pm_fatlock, KA_XLOCKED) 247 248 #endif /* _KERNEL || MAKEFS */ 249 250 #ifndef MAKEFS 251 /* 252 * Arguments to mount MSDOS filesystems. 253 */ 254 struct msdosfs_args { 255 char *fspec; /* blocks special holding the fs to mount */ 256 struct oexport_args export; /* network export information */ 257 uid_t uid; /* uid that owns msdosfs files */ 258 gid_t gid; /* gid that owns msdosfs files */ 259 mode_t mask; /* file mask to be applied for msdosfs perms */ 260 int flags; /* see below */ 261 int unused1; /* unused, was version number */ 262 uint16_t unused2[128]; /* no longer used, was Local->Unicode table */ 263 char *cs_win; /* Windows(Unicode) Charset */ 264 char *cs_dos; /* DOS Charset */ 265 char *cs_local; /* Local Charset */ 266 mode_t dirmask; /* dir mask to be applied for msdosfs perms */ 267 }; 268 #endif /* MAKEFS */ 269 270 /* 271 * Msdosfs mount options: 272 */ 273 #define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */ 274 #define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */ 275 #define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */ 276 #define MSDOSFSMNT_KICONV 0x10 /* Use libiconv to convert chars */ 277 /* All flags above: */ 278 #define MSDOSFSMNT_MNTOPT \ 279 (MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \ 280 |MSDOSFSMNT_KICONV) 281 #define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */ 282 #define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */ 283 #define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */ 284 #define MSDOSFS_FSIMOD 0x01000000 285 #define MSDOSFS_ERR_RO 0x00800000 /* remouning ro due to error */ 286 287 #ifdef _KERNEL 288 void msdosfs_integrity_error(struct msdosfsmount *pmp); 289 #endif 290 291 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */ 292