212 lines
7.8 KiB
C
212 lines
7.8 KiB
C
/* $OpenBSD: msdosfsmount.h,v 1.23 2024/05/13 01:15:53 jsg Exp $ */
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/* $NetBSD: msdosfsmount.h,v 1.16 1997/10/17 11:24:24 ws 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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/*
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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_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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uint32_t pm_BlkPerSec; /* # of DEV_BSIZE blocks in MSDOSFS sector */
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uint32_t pm_FATsecs; /* actual number of fat sectors */
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uint32_t pm_fatblk; /* block # of first FAT */
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uint32_t pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */
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uint32_t pm_rootdirsize; /* size in blocks (not clusters) */
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uint32_t pm_firstcluster; /* block number of first cluster */
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uint32_t pm_nmbrofclusters; /* # of clusters in filesystem */
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uint32_t pm_maxcluster; /* maximum cluster number */
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uint32_t pm_freeclustercount; /* number of free clusters */
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uint32_t pm_cnshift; /* shift file offset right this amount to get a cluster number */
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uint32_t pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
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uint32_t pm_bnshift; /* shift file offset right this amount to get a block number */
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uint32_t pm_bpcluster; /* bytes per cluster */
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uint32_t pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
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uint32_t pm_fatblocksize; /* size of fat blocks in bytes */
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uint32_t pm_fatblocksec; /* size of fat blocks in sectors */
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uint32_t pm_fatsize; /* size of fat in bytes */
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uint32_t pm_fatmask; /* mask to use for fat numbers */
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uint32_t pm_fsinfo; /* fsinfo block number */
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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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struct netexport pm_export; /* export information */
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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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/*
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* Mount point flags:
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*/
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#if 0
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/* Defined in <sys/mount.h> */
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#define MSDOSFSMNT_SHORTNAME 0x01
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#define MSDOSFSMNT_LONGNAME 0x02
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#define MSDOSFSMNT_NOWIN95 0x04
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#endif
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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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#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 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 *)(((bp)->b_data) \
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+ ((dirofs) & (pmp)->pm_crbomask)))
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/*
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* Convert block 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 block 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 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 block 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 block 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 block 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 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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(de_blk((pmp), (dirofs)) + (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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/* Calculate size of fsinfo block */
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#define fsi_size(pmp) \
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(1024 << ((pmp)->pm_BlkPerSec >> 2))
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/*
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* Prototypes for MSDOSFS virtual filesystem operations
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*/
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int msdosfs_mount(struct mount *, const char *, void *, struct nameidata *, struct proc *);
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int msdosfs_start(struct mount *, int, struct proc *);
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int msdosfs_unmount(struct mount *, int, struct proc *);
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int msdosfs_root(struct mount *, struct vnode **);
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int msdosfs_statfs(struct mount *, struct statfs *, struct proc *);
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int msdosfs_sync(struct mount *, int, int, struct ucred *, struct proc *);
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int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **);
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int msdosfs_vptofh(struct vnode *, struct fid *);
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int msdosfs_init(struct vfsconf *);
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