/* $Id$ */ /* $NetBSD: msdosfsmount.h,v 1.7 1994/08/21 18:44:17 ws Exp $ */ /*- * Copyright (C) 1994 Wolfgang Solfrank. * Copyright (C) 1994 TooLs GmbH. * All rights reserved. * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Written by Paul Popelka (paulp@uts.amdahl.com) * * You can do anything you want with this software, just don't say you wrote * it, and don't remove this notice. * * This software is provided "as is". * * The author supplies this software to be publicly redistributed on the * understanding that the author is not responsible for the correct * functioning of this software in any circumstances and is not liable for * any damages caused by this software. * * October 1992 */ /* * Layout of the mount control block for a msdos file system. */ struct msdosfsmount { struct mount *pm_mountp;/* vfs mount struct for this fs */ dev_t pm_dev; /* block special device mounted */ uid_t pm_mounter; /* uid of the user who mounted the FS */ uid_t pm_uid; /* uid to set as owner of the files */ gid_t pm_gid; /* gid to set as owner of the files */ mode_t pm_mask; /* mask to and with file protection bits */ struct vnode *pm_devvp; /* vnode for block device mntd */ struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */ u_long pm_fatblk; /* block # of first FAT */ u_long pm_rootdirblk; /* block # of root directory */ u_long pm_rootdirsize; /* size in blocks (not clusters) */ u_long pm_firstcluster; /* block number of first cluster */ u_long pm_nmbrofclusters; /* # of clusters in filesystem */ u_long pm_maxcluster; /* maximum cluster number */ u_long pm_freeclustercount; /* number of free clusters */ u_long pm_bnshift; /* shift file offset right this amount to get a block number */ u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */ u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */ u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */ u_long pm_bpcluster; /* bytes per cluster */ u_long pm_depclust; /* directory entries per cluster */ u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */ u_long pm_fatblocksize; /* size of fat blocks in bytes */ u_long pm_fatblocksec; /* size of fat blocks in sectors */ u_long pm_fatsize; /* size of fat in bytes */ u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */ char pm_ronly; /* read only if non-zero */ char pm_waitonfat; /* wait for writes of the fat to complete, when 0 use bdwrite, else use bwrite */ struct netexport pm_export; /* export information */ }; /* Number of bits in one pm_inusemap item: */ #define N_INUSEBITS (8 * sizeof(u_int)) /* * How to compute pm_cnshift and pm_crbomask. * * pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1 * if (bytesperclust == * 0) * return EBADBLKSZ; * bit = 1; * for (i = 0; i < 32; i++) { * if (bit & bytesperclust) { * if (bit ^ bytesperclust) * return EBADBLKSZ; * pm_cnshift = * i; * break; * } * bit <<= 1; * } */ /* * Shorthand for fields in the bpb contained in the msdosfsmount structure. */ #define pm_BytesPerSec pm_bpb.bpbBytesPerSec #define pm_SectPerClust pm_bpb.bpbSecPerClust #define pm_ResSectors pm_bpb.bpbResSectors #define pm_FATs pm_bpb.bpbFATs #define pm_RootDirEnts pm_bpb.bpbRootDirEnts #define pm_Sectors pm_bpb.bpbSectors #define pm_Media pm_bpb.bpbMedia #define pm_FATsecs pm_bpb.bpbFATsecs #define pm_SecPerTrack pm_bpb.bpbSecPerTrack #define pm_Heads pm_bpb.bpbHeads #define pm_HiddenSects pm_bpb.bpbHiddenSecs #define pm_HugeSectors pm_bpb.bpbHugeSectors /* * Map a cluster number into a filesystem relative block number. */ #define cntobn(pmp, cn) \ ((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster) /* * Map a filesystem relative block number back into a cluster number. */ #define bntocn(pmp, bn) \ ((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST) /* * Calculate block number for directory entry in root dir, offset dirofs */ #define roottobn(pmp, dirofs) \ (((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \ + (pmp)->pm_rootdirblk) /* * Calculate block number for directory entry at cluster dirclu, offset * dirofs */ #define detobn(pmp, dirclu, dirofs) \ ((dirclu) == MSDOSFSROOT \ ? roottobn((pmp), (dirofs)) \ : cntobn((pmp), (dirclu))) /* * Convert pointer to buffer -> pointer to direntry */ #define bptoep(pmp, bp, dirofs) \ ((struct direntry *)((bp)->b_data) \ + (dirofs) % (pmp)->pm_depclust) /* * Convert filesize to block number */ #define de_blk(pmp, off) \ ((off) >> (pmp)->pm_cnshift) /* * Clusters required to hold size bytes */ #define de_clcount(pmp, size) \ (((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) int msdosfs_init __P((struct vfsconf *vfsp)); /* * Arguments to mount MSDOS filesystems. */ struct msdosfs_args { char *fspec; /* blocks special holding the fs to mount */ struct export_args export; /* network export information */ uid_t uid; /* uid that owns msdosfs files */ gid_t gid; /* gid that owns msdosfs files */ mode_t mask; /* mask to be applied for msdosfs perms */ };