172 lines
6.3 KiB
C
172 lines
6.3 KiB
C
/* $Id: msdosfsmount.h,v 1.5 1995/11/16 11:48:10 bde Exp $ */
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/* $NetBSD: msdosfsmount.h,v 1.7 1994/08/21 18:44:17 ws Exp $ */
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/*-
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* Copyright (C) 1994 Wolfgang Solfrank.
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* Copyright (C) 1994 TooLs GmbH.
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* All rights reserved.
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* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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/*
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* Layout of the mount control block for a msdos file system.
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*/
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struct msdosfsmount {
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struct mount *pm_mountp;/* vfs mount struct for this fs */
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dev_t pm_dev; /* block special device mounted */
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uid_t pm_mounter; /* uid of the user who mounted the FS */
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uid_t pm_uid; /* uid to set as owner of the files */
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gid_t pm_gid; /* gid to set as owner of the files */
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mode_t pm_mask; /* mask to and with file protection bits */
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struct vnode *pm_devvp; /* vnode for block device mntd */
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struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
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u_long pm_fatblk; /* block # of first FAT */
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u_long pm_rootdirblk; /* block # of root directory */
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u_long pm_rootdirsize; /* size in blocks (not clusters) */
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u_long pm_firstcluster; /* block number of first cluster */
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u_long pm_nmbrofclusters; /* # of clusters in filesystem */
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u_long pm_maxcluster; /* maximum cluster number */
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u_long pm_freeclustercount; /* number of free clusters */
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u_long pm_bnshift; /* shift file offset right this amount to get a block number */
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u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */
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u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
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u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
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u_long pm_bpcluster; /* bytes per cluster */
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u_long pm_depclust; /* directory entries per cluster */
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u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
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u_long pm_fatblocksize; /* size of fat blocks in bytes */
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u_long pm_fatblocksec; /* size of fat blocks in sectors */
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u_long pm_fatsize; /* size of fat in bytes */
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u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
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char pm_ronly; /* read only if non-zero */
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char pm_waitonfat; /* wait for writes of the fat to complete, when 0 use bdwrite, else use bwrite */
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struct netexport pm_export; /* export information */
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};
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/* Number of bits in one pm_inusemap item: */
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#define N_INUSEBITS (8 * sizeof(u_int))
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/*
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* How to compute pm_cnshift and pm_crbomask.
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*
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* pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1
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* if (bytesperclust == * 0)
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* return EBADBLKSZ;
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* bit = 1;
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* for (i = 0; i < 32; i++) {
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* if (bit & bytesperclust) {
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* if (bit ^ bytesperclust)
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* return EBADBLKSZ;
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* pm_cnshift = * i;
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* break;
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* }
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* bit <<= 1;
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* }
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*/
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/*
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* Shorthand for fields in the bpb contained in the msdosfsmount structure.
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*/
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#define pm_BytesPerSec pm_bpb.bpbBytesPerSec
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#define pm_SectPerClust pm_bpb.bpbSecPerClust
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#define pm_ResSectors pm_bpb.bpbResSectors
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#define pm_FATs pm_bpb.bpbFATs
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#define pm_RootDirEnts pm_bpb.bpbRootDirEnts
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#define pm_Sectors pm_bpb.bpbSectors
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#define pm_Media pm_bpb.bpbMedia
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#define pm_FATsecs pm_bpb.bpbFATsecs
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#define pm_SecPerTrack pm_bpb.bpbSecPerTrack
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#define pm_Heads pm_bpb.bpbHeads
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#define pm_HiddenSects pm_bpb.bpbHiddenSecs
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#define pm_HugeSectors pm_bpb.bpbHugeSectors
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/*
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* Map a cluster number into a filesystem relative block number.
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*/
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#define cntobn(pmp, cn) \
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((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster)
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/*
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* Map a filesystem relative block number back into a cluster number.
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*/
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#define bntocn(pmp, bn) \
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((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST)
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/*
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* Calculate block number for directory entry in root dir, offset dirofs
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*/
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#define roottobn(pmp, dirofs) \
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(((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \
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+ (pmp)->pm_rootdirblk)
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/*
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* Calculate block number for directory entry at cluster dirclu, offset
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* dirofs
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*/
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#define detobn(pmp, dirclu, dirofs) \
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((dirclu) == MSDOSFSROOT \
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? roottobn((pmp), (dirofs)) \
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: cntobn((pmp), (dirclu)))
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/*
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* Convert pointer to buffer -> pointer to direntry
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*/
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#define bptoep(pmp, bp, dirofs) \
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((struct direntry *)((bp)->b_data) \
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+ (dirofs) % (pmp)->pm_depclust)
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/*
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* Convert filesize to block number
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*/
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#define de_blk(pmp, off) \
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((off) >> (pmp)->pm_cnshift)
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/*
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* Clusters required to hold size bytes
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*/
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#define de_clcount(pmp, size) \
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(((size) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift)
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int msdosfs_init __P((void));
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