version 1.1.2.1, 2002/12/26 12:31:35 |
version 1.1.2.2, 2002/12/29 19:56:07 |
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/* $NetBSD$ */ |
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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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* 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_args export; /* network export information */ |
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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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}; |
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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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/* 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) |
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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\0bgemdosfs\0" \ |
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"b\037ronly\0b\036waitonfat\0b\035fatmirror" |
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#ifdef _KERNEL |
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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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u_long pm_FATsecs; /* actual number of fat sectors */ |
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u_long pm_fatblk; /* block # of first FAT */ |
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u_long pm_rootdirblk; /* block # (cluster # for FAT32) of root directory number */ |
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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_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 block 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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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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#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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/* |
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* Prototypes for MSDOSFS virtual filesystem operations |
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*/ |
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void msdosfs_init __P((void)); |
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void msdosfs_reinit __P((void)); |
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void msdosfs_done __P((void)); |
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#endif /* _KERNEL */ |