msdosfsmount.h revision 30354
130354Sphk/* $Id: msdosfsmount.h,v 1.11 1997/03/03 17:36:11 bde Exp $ */ 22893Sdfr/* $NetBSD: msdosfsmount.h,v 1.7 1994/08/21 18:44:17 ws Exp $ */ 32893Sdfr 42893Sdfr/*- 52893Sdfr * Copyright (C) 1994 Wolfgang Solfrank. 62893Sdfr * Copyright (C) 1994 TooLs GmbH. 72893Sdfr * All rights reserved. 82893Sdfr * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 92893Sdfr * 102893Sdfr * Redistribution and use in source and binary forms, with or without 112893Sdfr * modification, are permitted provided that the following conditions 122893Sdfr * are met: 132893Sdfr * 1. Redistributions of source code must retain the above copyright 142893Sdfr * notice, this list of conditions and the following disclaimer. 152893Sdfr * 2. Redistributions in binary form must reproduce the above copyright 162893Sdfr * notice, this list of conditions and the following disclaimer in the 172893Sdfr * documentation and/or other materials provided with the distribution. 182893Sdfr * 3. All advertising materials mentioning features or use of this software 192893Sdfr * must display the following acknowledgement: 202893Sdfr * This product includes software developed by TooLs GmbH. 212893Sdfr * 4. The name of TooLs GmbH may not be used to endorse or promote products 222893Sdfr * derived from this software without specific prior written permission. 232893Sdfr * 242893Sdfr * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 252893Sdfr * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 262893Sdfr * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 272893Sdfr * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 282893Sdfr * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 292893Sdfr * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 302893Sdfr * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 312893Sdfr * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 322893Sdfr * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 332893Sdfr * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 342893Sdfr */ 352893Sdfr/* 362893Sdfr * Written by Paul Popelka (paulp@uts.amdahl.com) 378876Srgrimes * 382893Sdfr * You can do anything you want with this software, just don't say you wrote 392893Sdfr * it, and don't remove this notice. 408876Srgrimes * 412893Sdfr * This software is provided "as is". 428876Srgrimes * 432893Sdfr * The author supplies this software to be publicly redistributed on the 442893Sdfr * understanding that the author is not responsible for the correct 452893Sdfr * functioning of this software in any circumstances and is not liable for 462893Sdfr * any damages caused by this software. 478876Srgrimes * 482893Sdfr * October 1992 492893Sdfr */ 502893Sdfr 5123351Sbde#ifndef _MSDOSFS_MSDOSFSMOUNT_H_ 5223351Sbde#define _MSDOSFS_MSDOSFSMOUNT_H_ 5323351Sbde 5423351Sbde#ifdef KERNEL 5523351Sbde 5630354Sphk#ifdef MALLOC_DECLARE 5730354SphkMALLOC_DECLARE(M_MSDOSFSMNT); 5830354Sphk#endif 5930354Sphk 602893Sdfr/* 612893Sdfr * Layout of the mount control block for a msdos file system. 622893Sdfr */ 632893Sdfrstruct msdosfsmount { 642893Sdfr struct mount *pm_mountp;/* vfs mount struct for this fs */ 652893Sdfr dev_t pm_dev; /* block special device mounted */ 662893Sdfr uid_t pm_mounter; /* uid of the user who mounted the FS */ 672893Sdfr uid_t pm_uid; /* uid to set as owner of the files */ 682893Sdfr gid_t pm_gid; /* gid to set as owner of the files */ 692893Sdfr mode_t pm_mask; /* mask to and with file protection bits */ 702893Sdfr struct vnode *pm_devvp; /* vnode for block device mntd */ 712893Sdfr struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ 722893Sdfr u_long pm_fatblk; /* block # of first FAT */ 732893Sdfr u_long pm_rootdirblk; /* block # of root directory */ 742893Sdfr u_long pm_rootdirsize; /* size in blocks (not clusters) */ 752893Sdfr u_long pm_firstcluster; /* block number of first cluster */ 762893Sdfr u_long pm_nmbrofclusters; /* # of clusters in filesystem */ 772893Sdfr u_long pm_maxcluster; /* maximum cluster number */ 782893Sdfr u_long pm_freeclustercount; /* number of free clusters */ 792893Sdfr u_long pm_bnshift; /* shift file offset right this amount to get a block number */ 802893Sdfr u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */ 812893Sdfr u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ 822893Sdfr u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ 832893Sdfr u_long pm_bpcluster; /* bytes per cluster */ 842893Sdfr u_long pm_depclust; /* directory entries per cluster */ 852893Sdfr u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ 862893Sdfr u_long pm_fatblocksize; /* size of fat blocks in bytes */ 872893Sdfr u_long pm_fatblocksec; /* size of fat blocks in sectors */ 882893Sdfr u_long pm_fatsize; /* size of fat in bytes */ 892893Sdfr u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ 902893Sdfr char pm_ronly; /* read only if non-zero */ 9113765Smpp char pm_waitonfat; /* wait for writes of the fat to complete, when 0 use bdwrite, else use bwrite */ 922893Sdfr struct netexport pm_export; /* export information */ 932893Sdfr}; 942893Sdfr 952893Sdfr/* Number of bits in one pm_inusemap item: */ 962893Sdfr#define N_INUSEBITS (8 * sizeof(u_int)) 972893Sdfr 982893Sdfr/* 992893Sdfr * How to compute pm_cnshift and pm_crbomask. 1008876Srgrimes * 1018876Srgrimes * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1 1028876Srgrimes * if (bytesperclust == * 0) 1038876Srgrimes * return EBADBLKSZ; 1048876Srgrimes * bit = 1; 1058876Srgrimes * for (i = 0; i < 32; i++) { 1068876Srgrimes * if (bit & bytesperclust) { 1078876Srgrimes * if (bit ^ bytesperclust) 1088876Srgrimes * return EBADBLKSZ; 1098876Srgrimes * pm_cnshift = * i; 1108876Srgrimes * break; 1118876Srgrimes * } 1128876Srgrimes * bit <<= 1; 1132893Sdfr * } 1142893Sdfr */ 1152893Sdfr 1162893Sdfr/* 1172893Sdfr * Shorthand for fields in the bpb contained in the msdosfsmount structure. 1182893Sdfr */ 1192893Sdfr#define pm_BytesPerSec pm_bpb.bpbBytesPerSec 1202893Sdfr#define pm_SectPerClust pm_bpb.bpbSecPerClust 1212893Sdfr#define pm_ResSectors pm_bpb.bpbResSectors 1222893Sdfr#define pm_FATs pm_bpb.bpbFATs 1232893Sdfr#define pm_RootDirEnts pm_bpb.bpbRootDirEnts 1242893Sdfr#define pm_Sectors pm_bpb.bpbSectors 1252893Sdfr#define pm_Media pm_bpb.bpbMedia 1262893Sdfr#define pm_FATsecs pm_bpb.bpbFATsecs 1272893Sdfr#define pm_SecPerTrack pm_bpb.bpbSecPerTrack 1282893Sdfr#define pm_Heads pm_bpb.bpbHeads 1292893Sdfr#define pm_HiddenSects pm_bpb.bpbHiddenSecs 1302893Sdfr#define pm_HugeSectors pm_bpb.bpbHugeSectors 1312893Sdfr 1322893Sdfr/* 1332893Sdfr * Map a cluster number into a filesystem relative block number. 1342893Sdfr */ 1352893Sdfr#define cntobn(pmp, cn) \ 1362893Sdfr ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster) 1372893Sdfr 1382893Sdfr/* 1392893Sdfr * Map a filesystem relative block number back into a cluster number. 1402893Sdfr */ 1412893Sdfr#define bntocn(pmp, bn) \ 1422893Sdfr ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST) 1432893Sdfr 1442893Sdfr/* 1452893Sdfr * Calculate block number for directory entry in root dir, offset dirofs 1462893Sdfr */ 1472893Sdfr#define roottobn(pmp, dirofs) \ 1482893Sdfr (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \ 1492893Sdfr + (pmp)->pm_rootdirblk) 1502893Sdfr 1512893Sdfr/* 1522893Sdfr * Calculate block number for directory entry at cluster dirclu, offset 1532893Sdfr * dirofs 1542893Sdfr */ 1552893Sdfr#define detobn(pmp, dirclu, dirofs) \ 1562893Sdfr ((dirclu) == MSDOSFSROOT \ 1572893Sdfr ? roottobn((pmp), (dirofs)) \ 1582893Sdfr : cntobn((pmp), (dirclu))) 1592893Sdfr 1602893Sdfr/* 1612893Sdfr * Convert pointer to buffer -> pointer to direntry 1622893Sdfr */ 1632893Sdfr#define bptoep(pmp, bp, dirofs) \ 1642893Sdfr ((struct direntry *)((bp)->b_data) \ 1652893Sdfr + (dirofs) % (pmp)->pm_depclust) 1662893Sdfr 1672893Sdfr 1682893Sdfr/* 1692893Sdfr * Convert filesize to block number 1702893Sdfr */ 1712893Sdfr#define de_blk(pmp, off) \ 1722893Sdfr ((off) >> (pmp)->pm_cnshift) 1732893Sdfr 1742893Sdfr/* 1752893Sdfr * Clusters required to hold size bytes 1762893Sdfr */ 1772893Sdfr#define de_clcount(pmp, size) \ 1782893Sdfr (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) 1792893Sdfr 18022601Smppint msdosfs_init __P((struct vfsconf *vfsp)); 18122521Sdyson 18223351Sbde#endif /* KERNEL */ 18323351Sbde 18422521Sdyson/* 18522521Sdyson * Arguments to mount MSDOS filesystems. 18622521Sdyson */ 18722521Sdysonstruct msdosfs_args { 18822521Sdyson char *fspec; /* blocks special holding the fs to mount */ 18922521Sdyson struct export_args export; /* network export information */ 19022521Sdyson uid_t uid; /* uid that owns msdosfs files */ 19122521Sdyson gid_t gid; /* gid that owns msdosfs files */ 19222521Sdyson mode_t mask; /* mask to be applied for msdosfs perms */ 19322521Sdyson}; 19422521Sdyson 19523351Sbde#endif /* !_MSDOSFS_MSDOSFSMOUNT_H_ */ 196