256 lines
8.8 KiB
C
256 lines
8.8 KiB
C
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/* $NetBSD: msdosfsmount.h,v 1.19 2013/01/26 16:51:51 christos Exp $ */
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/*-
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* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
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* Copyright (C) 1994, 1995, 1997 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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#ifndef _MSDOSFS_MSDOSFSMOUNT_H_
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#define _MSDOSFS_MSDOSFSMOUNT_H_
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#ifndef MAKEFS
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/*
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* Arguments to mount MSDOS filesystems.
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*/
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struct msdosfs_args {
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char *fspec; /* blocks special holding the fs to mount */
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struct export_args30 _pad1; /* compat with old userland tools */
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uid_t uid; /* uid that owns msdosfs files */
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gid_t gid; /* gid that owns msdosfs files */
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mode_t mask; /* mask to be applied for msdosfs perms */
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int flags; /* see below */
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/* Following items added after versioning support */
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int version; /* version of the struct */
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#define MSDOSFSMNT_VERSION 3
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mode_t dirmask; /* v2: mask to be applied for msdosfs perms */
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int gmtoff; /* v3: offset from UTC in seconds */
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};
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#endif
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/*
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* Msdosfs mount options:
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*/
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#define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
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#define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
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#define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
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#define MSDOSFSMNT_GEMDOSFS 8 /* This is a GEMDOS-flavour */
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#define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */
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/* All flags above: */
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#define MSDOSFSMNT_MNTOPT \
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(MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
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|MSDOSFSMNT_GEMDOSFS|MSDOSFSMNT_VERSIONED)
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#define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
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#define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
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#define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
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#define MSDOSFSMNT_BITS "\177\20" \
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"b\00shortname\0b\01longname\0b\02nowin95\0b\03gemdosfs\0b\04mntversioned\0" \
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"b\037ronly\0b\036waitonfat\0b\035fatmirror\0"
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#ifdef _KERNEL
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#include <sys/mallocvar.h>
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_MSDOSFSMNT);
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MALLOC_DECLARE(M_MSDOSFSTMP);
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#endif
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#endif
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#if defined(_KERNEL) || defined(MAKEFS)
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/*
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* Layout of the mount control block for a MSDOSFS 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_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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for files */
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mode_t pm_dirmask; /* mask to and with file protection bits
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for directories */
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int pm_gmtoff; /* offset from UTC in seconds */
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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_FATsecs; /* actual number of FAT sectors */
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u_long pm_fatblk; /* sector # of first FAT */
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u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */
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u_long pm_rootdirsize; /* size in sectors (not clusters) */
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u_long pm_firstcluster; /* sector 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_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_bnshift; /* shift file offset right this amount to get a sector number */
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u_long pm_bpcluster; /* bytes 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_long pm_fatmask; /* mask to use for FAT numbers */
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u_long pm_fsinfo; /* fsinfo block number */
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u_long pm_nxtfree; /* next free cluster in fsinfo block */
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u_int pm_fatmult; /* these 2 values are used in FAT */
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u_int pm_fatdiv; /* offset computation */
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u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */
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u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
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u_int pm_flags; /* see below */
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};
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/* Byte offset in FAT on filesystem pmp, cluster cn */
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#define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
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#define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
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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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* 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_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_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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* 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 *)(((char *)(bp)->b_data) \
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+ ((dirofs) & (pmp)->pm_crbomask)))
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/*
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* Convert sector number to cluster number
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*/
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#define de_bn2cn(pmp, bn) \
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((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
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/*
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* Convert cluster number to sector number
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*/
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#define de_cn2bn(pmp, cn) \
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((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
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/*
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* Convert sector number to kernel block number
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*/
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#define de_bn2kb(pmp, bn) \
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((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT))
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/*
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* Convert kernel block number to sector number
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*/
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#define de_kb2bn(pmp, kb) \
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((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT))
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/*
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* Convert file offset to cluster number
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*/
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#define de_cluster(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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/*
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* Convert file offset to sector number
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*/
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#define de_blk(pmp, off) \
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(de_cn2bn(pmp, de_cluster((pmp), (off))))
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/*
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* Convert cluster number to file offset
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*/
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#define de_cn2off(pmp, cn) \
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((cn) << (pmp)->pm_cnshift)
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/*
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* Convert sector number to file offset
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*/
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#define de_bn2off(pmp, bn) \
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((bn) << (pmp)->pm_bnshift)
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/*
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* Map a cluster number into a filesystem relative sector number.
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*/
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#define cntobn(pmp, cn) \
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(de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
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/*
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* Calculate sector 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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(de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
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/*
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* Calculate sector 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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* Prototypes for MSDOSFS virtual filesystem operations
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*/
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void msdosfs_init(void);
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void msdosfs_reinit(void);
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void msdosfs_done(void);
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#endif /* _KERNEL || MAKEFS */
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#endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */
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