msdosfsmount.h revision 30354
1/* $Id: msdosfsmount.h,v 1.11 1997/03/03 17:36:11 bde Exp $ */ 2/* $NetBSD: msdosfsmount.h,v 1.7 1994/08/21 18:44:17 ws Exp $ */ 3 4/*- 5 * Copyright (C) 1994 Wolfgang Solfrank. 6 * Copyright (C) 1994 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35/* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51#ifndef _MSDOSFS_MSDOSFSMOUNT_H_ 52#define _MSDOSFS_MSDOSFSMOUNT_H_ 53 54#ifdef KERNEL 55 56#ifdef MALLOC_DECLARE 57MALLOC_DECLARE(M_MSDOSFSMNT); 58#endif 59 60/* 61 * Layout of the mount control block for a msdos file system. 62 */ 63struct msdosfsmount { 64 struct mount *pm_mountp;/* vfs mount struct for this fs */ 65 dev_t pm_dev; /* block special device mounted */ 66 uid_t pm_mounter; /* uid of the user who mounted the FS */ 67 uid_t pm_uid; /* uid to set as owner of the files */ 68 gid_t pm_gid; /* gid to set as owner of the files */ 69 mode_t pm_mask; /* mask to and with file protection bits */ 70 struct vnode *pm_devvp; /* vnode for block device mntd */ 71 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 72 u_long pm_fatblk; /* block # of first FAT */ 73 u_long pm_rootdirblk; /* block # of root directory */ 74 u_long pm_rootdirsize; /* size in blocks (not clusters) */ 75 u_long pm_firstcluster; /* block number of first cluster */ 76 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 77 u_long pm_maxcluster; /* maximum cluster number */ 78 u_long pm_freeclustercount; /* number of free clusters */ 79 u_long pm_bnshift; /* shift file offset right this amount to get a block number */ 80 u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */ 81 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 82 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 83 u_long pm_bpcluster; /* bytes per cluster */ 84 u_long pm_depclust; /* directory entries per cluster */ 85 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 86 u_long pm_fatblocksize; /* size of fat blocks in bytes */ 87 u_long pm_fatblocksec; /* size of fat blocks in sectors */ 88 u_long pm_fatsize; /* size of fat in bytes */ 89 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 90 char pm_ronly; /* read only if non-zero */ 91 char pm_waitonfat; /* wait for writes of the fat to complete, when 0 use bdwrite, else use bwrite */ 92 struct netexport pm_export; /* export information */ 93}; 94 95/* Number of bits in one pm_inusemap item: */ 96#define N_INUSEBITS (8 * sizeof(u_int)) 97 98/* 99 * How to compute pm_cnshift and pm_crbomask. 100 * 101 * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1 102 * if (bytesperclust == * 0) 103 * return EBADBLKSZ; 104 * bit = 1; 105 * for (i = 0; i < 32; i++) { 106 * if (bit & bytesperclust) { 107 * if (bit ^ bytesperclust) 108 * return EBADBLKSZ; 109 * pm_cnshift = * i; 110 * break; 111 * } 112 * bit <<= 1; 113 * } 114 */ 115 116/* 117 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 118 */ 119#define pm_BytesPerSec pm_bpb.bpbBytesPerSec 120#define pm_SectPerClust pm_bpb.bpbSecPerClust 121#define pm_ResSectors pm_bpb.bpbResSectors 122#define pm_FATs pm_bpb.bpbFATs 123#define pm_RootDirEnts pm_bpb.bpbRootDirEnts 124#define pm_Sectors pm_bpb.bpbSectors 125#define pm_Media pm_bpb.bpbMedia 126#define pm_FATsecs pm_bpb.bpbFATsecs 127#define pm_SecPerTrack pm_bpb.bpbSecPerTrack 128#define pm_Heads pm_bpb.bpbHeads 129#define pm_HiddenSects pm_bpb.bpbHiddenSecs 130#define pm_HugeSectors pm_bpb.bpbHugeSectors 131 132/* 133 * Map a cluster number into a filesystem relative block number. 134 */ 135#define cntobn(pmp, cn) \ 136 ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster) 137 138/* 139 * Map a filesystem relative block number back into a cluster number. 140 */ 141#define bntocn(pmp, bn) \ 142 ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST) 143 144/* 145 * Calculate block number for directory entry in root dir, offset dirofs 146 */ 147#define roottobn(pmp, dirofs) \ 148 (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \ 149 + (pmp)->pm_rootdirblk) 150 151/* 152 * Calculate block number for directory entry at cluster dirclu, offset 153 * dirofs 154 */ 155#define detobn(pmp, dirclu, dirofs) \ 156 ((dirclu) == MSDOSFSROOT \ 157 ? roottobn((pmp), (dirofs)) \ 158 : cntobn((pmp), (dirclu))) 159 160/* 161 * Convert pointer to buffer -> pointer to direntry 162 */ 163#define bptoep(pmp, bp, dirofs) \ 164 ((struct direntry *)((bp)->b_data) \ 165 + (dirofs) % (pmp)->pm_depclust) 166 167 168/* 169 * Convert filesize to block number 170 */ 171#define de_blk(pmp, off) \ 172 ((off) >> (pmp)->pm_cnshift) 173 174/* 175 * Clusters required to hold size bytes 176 */ 177#define de_clcount(pmp, size) \ 178 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 179 180int msdosfs_init __P((struct vfsconf *vfsp)); 181 182#endif /* KERNEL */ 183 184/* 185 * Arguments to mount MSDOS filesystems. 186 */ 187struct msdosfs_args { 188 char *fspec; /* blocks special holding the fs to mount */ 189 struct export_args export; /* network export information */ 190 uid_t uid; /* uid that owns msdosfs files */ 191 gid_t gid; /* gid that owns msdosfs files */ 192 mode_t mask; /* mask to be applied for msdosfs perms */ 193}; 194 195#endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */ 196