1 /* $Id: msdosfsmount.h,v 1.10 1997/02/22 09:40:49 peter 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 /* 57 * Layout of the mount control block for a msdos file system. 58 */ 59 struct msdosfsmount { 60 struct mount *pm_mountp;/* vfs mount struct for this fs */ 61 dev_t pm_dev; /* block special device mounted */ 62 uid_t pm_mounter; /* uid of the user who mounted the FS */ 63 uid_t pm_uid; /* uid to set as owner of the files */ 64 gid_t pm_gid; /* gid to set as owner of the files */ 65 mode_t pm_mask; /* mask to and with file protection bits */ 66 struct vnode *pm_devvp; /* vnode for block device mntd */ 67 struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 68 u_long pm_fatblk; /* block # of first FAT */ 69 u_long pm_rootdirblk; /* block # of root directory */ 70 u_long pm_rootdirsize; /* size in blocks (not clusters) */ 71 u_long pm_firstcluster; /* block number of first cluster */ 72 u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 73 u_long pm_maxcluster; /* maximum cluster number */ 74 u_long pm_freeclustercount; /* number of free clusters */ 75 u_long pm_bnshift; /* shift file offset right this amount to get a block number */ 76 u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */ 77 u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 78 u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 79 u_long pm_bpcluster; /* bytes per cluster */ 80 u_long pm_depclust; /* directory entries per cluster */ 81 u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 82 u_long pm_fatblocksize; /* size of fat blocks in bytes */ 83 u_long pm_fatblocksec; /* size of fat blocks in sectors */ 84 u_long pm_fatsize; /* size of fat in bytes */ 85 u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 86 char pm_ronly; /* read only if non-zero */ 87 char pm_waitonfat; /* wait for writes of the fat to complete, when 0 use bdwrite, else use bwrite */ 88 struct netexport pm_export; /* export information */ 89 }; 90 91 /* Number of bits in one pm_inusemap item: */ 92 #define N_INUSEBITS (8 * sizeof(u_int)) 93 94 /* 95 * How to compute pm_cnshift and pm_crbomask. 96 * 97 * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1 98 * if (bytesperclust == * 0) 99 * return EBADBLKSZ; 100 * bit = 1; 101 * for (i = 0; i < 32; i++) { 102 * if (bit & bytesperclust) { 103 * if (bit ^ bytesperclust) 104 * return EBADBLKSZ; 105 * pm_cnshift = * i; 106 * break; 107 * } 108 * bit <<= 1; 109 * } 110 */ 111 112 /* 113 * Shorthand for fields in the bpb contained in the msdosfsmount structure. 114 */ 115 #define pm_BytesPerSec pm_bpb.bpbBytesPerSec 116 #define pm_SectPerClust pm_bpb.bpbSecPerClust 117 #define pm_ResSectors pm_bpb.bpbResSectors 118 #define pm_FATs pm_bpb.bpbFATs 119 #define pm_RootDirEnts pm_bpb.bpbRootDirEnts 120 #define pm_Sectors pm_bpb.bpbSectors 121 #define pm_Media pm_bpb.bpbMedia 122 #define pm_FATsecs pm_bpb.bpbFATsecs 123 #define pm_SecPerTrack pm_bpb.bpbSecPerTrack 124 #define pm_Heads pm_bpb.bpbHeads 125 #define pm_HiddenSects pm_bpb.bpbHiddenSecs 126 #define pm_HugeSectors pm_bpb.bpbHugeSectors 127 128 /* 129 * Map a cluster number into a filesystem relative block number. 130 */ 131 #define cntobn(pmp, cn) \ 132 ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster) 133 134 /* 135 * Map a filesystem relative block number back into a cluster number. 136 */ 137 #define bntocn(pmp, bn) \ 138 ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST) 139 140 /* 141 * Calculate block number for directory entry in root dir, offset dirofs 142 */ 143 #define roottobn(pmp, dirofs) \ 144 (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \ 145 + (pmp)->pm_rootdirblk) 146 147 /* 148 * Calculate block number for directory entry at cluster dirclu, offset 149 * dirofs 150 */ 151 #define detobn(pmp, dirclu, dirofs) \ 152 ((dirclu) == MSDOSFSROOT \ 153 ? roottobn((pmp), (dirofs)) \ 154 : cntobn((pmp), (dirclu))) 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_depclust) 162 163 164 /* 165 * Convert filesize to block number 166 */ 167 #define de_blk(pmp, off) \ 168 ((off) >> (pmp)->pm_cnshift) 169 170 /* 171 * Clusters required to hold size bytes 172 */ 173 #define de_clcount(pmp, size) \ 174 (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 175 176 int msdosfs_init __P((struct vfsconf *vfsp)); 177 178 #endif /* KERNEL */ 179 180 /* 181 * Arguments to mount MSDOS filesystems. 182 */ 183 struct msdosfs_args { 184 char *fspec; /* blocks special holding the fs to mount */ 185 struct export_args export; /* network export information */ 186 uid_t uid; /* uid that owns msdosfs files */ 187 gid_t gid; /* gid that owns msdosfs files */ 188 mode_t mask; /* mask to be applied for msdosfs perms */ 189 }; 190 191 #endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */ 192