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/* $OpenBSD: msdosfsmount.h,v 1.1 2016/10/18 17:05:30 natano Exp $ */
/* $NetBSD: msdosfsmount.h,v 1.21 2016/01/30 09:59:27 mlelstv Exp $ */
/*-
* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
* Copyright (C) 1994, 1995, 1997 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
*/
#ifndef _MSDOSFS_MSDOSFSMOUNT_H_
#define _MSDOSFS_MSDOSFSMOUNT_H_
/*
* Msdosfs mount options:
*/
#define MSDOSFSMNT_SHORTNAME 1 /* Force old DOS short names only */
#define MSDOSFSMNT_LONGNAME 2 /* Force Win'95 long names */
#define MSDOSFSMNT_NOWIN95 4 /* Completely ignore Win95 entries */
#define MSDOSFSMNT_VERSIONED 16 /* Struct is versioned */
/* All flags above: */
#define MSDOSFSMNT_MNTOPT \
(MSDOSFSMNT_SHORTNAME|MSDOSFSMNT_LONGNAME|MSDOSFSMNT_NOWIN95 \
|MSDOSFSMNT_VERSIONED)
#define MSDOSFSMNT_RONLY 0x80000000 /* mounted read-only */
#define MSDOSFSMNT_WAITONFAT 0x40000000 /* mounted synchronous */
#define MSDOSFS_FATMIRROR 0x20000000 /* FAT is mirrored */
/*
* Layout of the mount control block for a MSDOSFS 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_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
for files */
mode_t pm_dirmask; /* mask to and with file protection bits
for directories */
int pm_minuteswest; /* of Greenwitch */
struct mkfsvnode *pm_devvp; /* mkfsvnode for block device mntd */
struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
u_long pm_FATsecs; /* actual number of FAT sectors */
u_long pm_fatblk; /* sector # of first FAT */
u_long pm_rootdirblk; /* sector # (cluster # for FAT32) of root directory number */
u_long pm_rootdirsize; /* size in sectors (not clusters) */
u_long pm_firstcluster; /* sector 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_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_bnshift; /* shift file offset right this amount to get a sector number */
u_long pm_bpcluster; /* bytes 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_long pm_fatmask; /* mask to use for FAT numbers */
u_long pm_fsinfo; /* fsinfo block number */
u_long pm_nxtfree; /* next free cluster in fsinfo block */
u_int pm_fatmult; /* these 2 values are used in FAT */
u_int pm_fatdiv; /* offset computation */
u_int pm_curfat; /* current FAT for FAT32 (0 otherwise) */
u_int *pm_inusemap; /* ptr to bitmap of in-use clusters */
u_int pm_flags; /* see below */
};
/* Byte offset in FAT on filesystem pmp, cluster cn */
#define FATOFS(pmp, cn) ((cn) * (pmp)->pm_fatmult / (pmp)->pm_fatdiv)
#define VFSTOMSDOSFS(mp) ((struct msdosfsmount *)mp->mnt_data)
/* Number of bits in one pm_inusemap item: */
#define N_INUSEBITS (8 * sizeof(u_int))
/*
* Shorthand for fields in the bpb contained in the msdosfsmount structure.
*/
#define pm_BytesPerSec pm_bpb.bpbBytesPerSec
#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_SecPerTrack pm_bpb.bpbSecPerTrack
#define pm_Heads pm_bpb.bpbHeads
#define pm_HiddenSects pm_bpb.bpbHiddenSecs
#define pm_HugeSectors pm_bpb.bpbHugeSectors
/*
* Convert pointer to buffer -> pointer to direntry
*/
#define bptoep(pmp, bp, dirofs) \
((struct direntry *)(((char *)(bp)->b_data) \
+ ((dirofs) & (pmp)->pm_crbomask)))
/*
* Convert sector number to cluster number
*/
#define de_bn2cn(pmp, bn) \
((bn) >> ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
/*
* Convert cluster number to sector number
*/
#define de_cn2bn(pmp, cn) \
((cn) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift))
/*
* Convert sector number to kernel block number
*/
#define de_bn2kb(pmp, bn) \
((bn) << ((pmp)->pm_bnshift - DEV_BSHIFT))
/*
* Convert kernel block number to sector number
*/
#define de_kb2bn(pmp, kb) \
((kb) >> ((pmp)->pm_bnshift - DEV_BSHIFT))
/*
* Convert file offset to cluster number
*/
#define de_cluster(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)
/*
* Convert file offset to sector number
*/
#define de_blk(pmp, off) \
(de_cn2bn(pmp, de_cluster((pmp), (off))))
/*
* Convert cluster number to file offset
*/
#define de_cn2off(pmp, cn) \
((cn) << (pmp)->pm_cnshift)
/*
* Convert sector number to file offset
*/
#define de_bn2off(pmp, bn) \
((bn) << (pmp)->pm_bnshift)
/*
* Map a cluster number into a filesystem relative sector number.
*/
#define cntobn(pmp, cn) \
(de_cn2bn((pmp), (cn)-CLUST_FIRST) + (pmp)->pm_firstcluster)
/*
* Calculate sector number for directory entry in root dir, offset dirofs
*/
#define roottobn(pmp, dirofs) \
(de_blk((pmp), (dirofs)) + (pmp)->pm_rootdirblk)
/*
* Calculate sector number for directory entry at cluster dirclu, offset
* dirofs
*/
#define detobn(pmp, dirclu, dirofs) \
((dirclu) == MSDOSFSROOT \
? roottobn((pmp), (dirofs)) \
: cntobn((pmp), (dirclu)))
/*
* Prototypes for MSDOSFS virtual filesystem operations
*/
void msdosfs_init(void);
void msdosfs_reinit(void);
void msdosfs_done(void);
#endif /* _MSDOSFS_MSDOSFSMOUNT_H_ */
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