425 lines
12 KiB
C
425 lines
12 KiB
C
/*-
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.7 2013/01/30 19:19:19 christos Exp $");
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#include <sys/param.h>
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#include <ffs/buf.h>
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#include <fs/msdosfs/bpb.h>
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#include <fs/msdosfs/bootsect.h>
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#include <fs/msdosfs/direntry.h>
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#include <fs/msdosfs/denode.h>
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#include <fs/msdosfs/msdosfsmount.h>
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#include <fs/msdosfs/fat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <util.h>
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#include "makefs.h"
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#include "msdos.h"
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#include "mkfs_msdos.h"
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#ifdef MSDOSFS_DEBUG
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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struct msdosfsmount *
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msdosfs_mount(struct vnode *devvp, int flags)
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{
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struct msdosfsmount *pmp = NULL;
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struct buf *bp;
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union bootsector *bsp;
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struct byte_bpb33 *b33;
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struct byte_bpb50 *b50;
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struct byte_bpb710 *b710;
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uint8_t SecPerClust;
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int ronly = 0, error, tmp;
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int bsize;
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struct msdos_options *m = devvp->fs->fs_specific;
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uint64_t psize = m->create_size;
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unsigned secsize = 512;
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DPRINTF(("%s(bread 0)\n", __func__));
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if ((error = bread(devvp, 0, secsize, NULL, 0, &bp)) != 0)
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goto error_exit;
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bsp = (union bootsector *)bp->b_data;
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b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
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b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
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b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
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if (!(flags & MSDOSFSMNT_GEMDOSFS)) {
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if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
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|| bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
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DPRINTF(("bootsig0 %d bootsig1 %d\n",
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bsp->bs50.bsBootSectSig0,
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bsp->bs50.bsBootSectSig1));
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error = EINVAL;
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goto error_exit;
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}
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bsize = 0;
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} else
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bsize = 512;
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pmp = ecalloc(1, sizeof *pmp);
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/*
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* Compute several useful quantities from the bpb in the
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* bootsector. Copy in the dos 5 variant of the bpb then fix up
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* the fields that are different between dos 5 and dos 3.3.
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*/
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SecPerClust = b50->bpbSecPerClust;
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pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
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pmp->pm_ResSectors = getushort(b50->bpbResSectors);
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pmp->pm_FATs = b50->bpbFATs;
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pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
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pmp->pm_Sectors = getushort(b50->bpbSectors);
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pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
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pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
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pmp->pm_Heads = getushort(b50->bpbHeads);
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pmp->pm_Media = b50->bpbMedia;
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DPRINTF(("%s(BytesPerSec=%u, ResSectors=%u, FATs=%d, RootDirEnts=%u, "
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"Sectors=%u, FATsecs=%lu, SecPerTrack=%u, Heads=%u, Media=%u)\n",
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__func__, pmp->pm_BytesPerSec, pmp->pm_ResSectors, pmp->pm_FATs,
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pmp->pm_RootDirEnts, pmp->pm_Sectors, pmp->pm_FATsecs,
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pmp->pm_SecPerTrack, pmp->pm_Heads, pmp->pm_Media));
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if (!(flags & MSDOSFSMNT_GEMDOSFS)) {
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/* XXX - We should probably check more values here */
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if (!pmp->pm_BytesPerSec || !SecPerClust
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|| pmp->pm_SecPerTrack > 63) {
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DPRINTF(("bytespersec %d secperclust %d "
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"secpertrack %d\n",
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pmp->pm_BytesPerSec, SecPerClust,
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pmp->pm_SecPerTrack));
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error = EINVAL;
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goto error_exit;
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}
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}
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if (pmp->pm_Sectors == 0) {
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pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
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pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
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} else {
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pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
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pmp->pm_HugeSectors = pmp->pm_Sectors;
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}
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if (pmp->pm_RootDirEnts == 0) {
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unsigned short vers = getushort(b710->bpbFSVers);
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/*
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* Some say that bsBootSectSig[23] must be zero, but
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* Windows does not require this and some digital cameras
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* do not set these to zero. Therefore, do not insist.
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*/
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if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) {
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DPRINTF(("sectors %d fatsecs %lu vers %d\n",
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pmp->pm_Sectors, pmp->pm_FATsecs, vers));
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error = EINVAL;
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goto error_exit;
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}
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pmp->pm_fatmask = FAT32_MASK;
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pmp->pm_fatmult = 4;
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pmp->pm_fatdiv = 1;
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pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
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/* mirrorring is enabled if the FATMIRROR bit is not set */
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if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0)
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pmp->pm_flags |= MSDOSFS_FATMIRROR;
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else
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pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
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} else
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pmp->pm_flags |= MSDOSFS_FATMIRROR;
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if (flags & MSDOSFSMNT_GEMDOSFS) {
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if (FAT32(pmp)) {
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DPRINTF(("FAT32 for GEMDOS\n"));
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/*
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* GEMDOS doesn't know FAT32.
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*/
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error = EINVAL;
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goto error_exit;
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}
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/*
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* Check a few values (could do some more):
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* - logical sector size: power of 2, >= block size
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* - sectors per cluster: power of 2, >= 1
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* - number of sectors: >= 1, <= size of partition
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*/
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if ( (SecPerClust == 0)
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|| (SecPerClust & (SecPerClust - 1))
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|| (pmp->pm_BytesPerSec < bsize)
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|| (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
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|| (pmp->pm_HugeSectors == 0)
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|| (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize)
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> psize)) {
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DPRINTF(("consistency checks for GEMDOS\n"));
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error = EINVAL;
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goto error_exit;
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}
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/*
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* XXX - Many parts of the msdosfs driver seem to assume that
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* the number of bytes per logical sector (BytesPerSec) will
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* always be the same as the number of bytes per disk block
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* Let's pretend it is.
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*/
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tmp = pmp->pm_BytesPerSec / bsize;
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pmp->pm_BytesPerSec = bsize;
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pmp->pm_HugeSectors *= tmp;
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pmp->pm_HiddenSects *= tmp;
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pmp->pm_ResSectors *= tmp;
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pmp->pm_Sectors *= tmp;
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pmp->pm_FATsecs *= tmp;
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SecPerClust *= tmp;
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}
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/* Check that fs has nonzero FAT size */
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if (pmp->pm_FATsecs == 0) {
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DPRINTF(("FATsecs is 0\n"));
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error = EINVAL;
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goto error_exit;
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}
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pmp->pm_fatblk = pmp->pm_ResSectors;
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if (FAT32(pmp)) {
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pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
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pmp->pm_firstcluster = pmp->pm_fatblk
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+ (pmp->pm_FATs * pmp->pm_FATsecs);
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pmp->pm_fsinfo = getushort(b710->bpbFSInfo);
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} else {
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pmp->pm_rootdirblk = pmp->pm_fatblk +
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(pmp->pm_FATs * pmp->pm_FATsecs);
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pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
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+ pmp->pm_BytesPerSec - 1)
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/ pmp->pm_BytesPerSec;/* in sectors */
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pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
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}
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pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
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SecPerClust;
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pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
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pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec;
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if (flags & MSDOSFSMNT_GEMDOSFS) {
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if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) {
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pmp->pm_fatmask = FAT12_MASK;
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pmp->pm_fatmult = 3;
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pmp->pm_fatdiv = 2;
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} else {
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pmp->pm_fatmask = FAT16_MASK;
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pmp->pm_fatmult = 2;
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pmp->pm_fatdiv = 1;
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}
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} else if (pmp->pm_fatmask == 0) {
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if (pmp->pm_maxcluster
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<= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
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/*
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* This will usually be a floppy disk. This size makes
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* sure that one FAT entry will not be split across
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* multiple blocks.
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*/
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pmp->pm_fatmask = FAT12_MASK;
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pmp->pm_fatmult = 3;
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pmp->pm_fatdiv = 2;
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} else {
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pmp->pm_fatmask = FAT16_MASK;
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pmp->pm_fatmult = 2;
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pmp->pm_fatdiv = 1;
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}
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}
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if (FAT12(pmp))
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pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
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else
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pmp->pm_fatblocksize = MAXBSIZE;
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pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec;
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pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1;
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/*
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* Compute mask and shift value for isolating cluster relative byte
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* offsets and cluster numbers from a file offset.
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*/
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pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec;
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pmp->pm_crbomask = pmp->pm_bpcluster - 1;
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pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
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DPRINTF(("%s(fatmask=%lu, fatmult=%u, fatdiv=%u, fatblocksize=%lu, "
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"fatblocksec=%lu, bnshift=%lu, pbcluster=%lu, crbomask=%lu, "
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"cnshift=%lu)\n",
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__func__, pmp->pm_fatmask, pmp->pm_fatmult, pmp->pm_fatdiv,
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pmp->pm_fatblocksize, pmp->pm_fatblocksec, pmp->pm_bnshift,
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pmp->pm_bpcluster, pmp->pm_crbomask, pmp->pm_cnshift));
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/*
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* Check for valid cluster size
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* must be a power of 2
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*/
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if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
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DPRINTF(("bpcluster %lu cnshift %lu\n",
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pmp->pm_bpcluster, pmp->pm_cnshift));
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error = EINVAL;
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goto error_exit;
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}
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/*
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* Release the bootsector buffer.
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*/
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brelse(bp, BC_AGE);
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bp = NULL;
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/*
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* Check FSInfo.
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*/
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if (pmp->pm_fsinfo) {
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struct fsinfo *fp;
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/*
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* XXX If the fsinfo block is stored on media with
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* 2KB or larger sectors, is the fsinfo structure
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* padded at the end or in the middle?
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*/
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DPRINTF(("%s(bread %lu)\n", __func__,
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(unsigned long)de_bn2kb(pmp, pmp->pm_fsinfo)));
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if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo),
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pmp->pm_BytesPerSec, NULL, 0, &bp)) != 0)
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goto error_exit;
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fp = (struct fsinfo *)bp->b_data;
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if (!memcmp(fp->fsisig1, "RRaA", 4)
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&& !memcmp(fp->fsisig2, "rrAa", 4)
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&& !memcmp(fp->fsisig3, "\0\0\125\252", 4)
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&& !memcmp(fp->fsisig4, "\0\0\125\252", 4))
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pmp->pm_nxtfree = getulong(fp->fsinxtfree);
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else
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pmp->pm_fsinfo = 0;
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brelse(bp, 0);
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bp = NULL;
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}
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/*
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* Check and validate (or perhaps invalidate?) the fsinfo structure?
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* XXX
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*/
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if (pmp->pm_fsinfo) {
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if ((pmp->pm_nxtfree == 0xffffffffUL) ||
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(pmp->pm_nxtfree > pmp->pm_maxcluster))
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pmp->pm_fsinfo = 0;
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}
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/*
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* Allocate memory for the bitmap of allocated clusters, and then
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* fill it in.
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*/
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pmp->pm_inusemap = ecalloc(sizeof(*pmp->pm_inusemap),
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((pmp->pm_maxcluster + N_INUSEBITS) / N_INUSEBITS));
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/*
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* fillinusemap() needs pm_devvp.
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*/
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pmp->pm_dev = 0;
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pmp->pm_devvp = devvp;
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/*
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* Have the inuse map filled in.
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*/
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if ((error = fillinusemap(pmp)) != 0) {
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DPRINTF(("fillinusemap %d\n", error));
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goto error_exit;
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}
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/*
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* Finish up.
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*/
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if (ronly)
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pmp->pm_flags |= MSDOSFSMNT_RONLY;
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else
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pmp->pm_fmod = 1;
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/*
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* If we ever do quotas for DOS filesystems this would be a place
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* to fill in the info in the msdosfsmount structure. You dolt,
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* quotas on dos filesystems make no sense because files have no
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* owners on dos filesystems. of course there is some empty space
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* in the directory entry where we could put uid's and gid's.
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*/
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return pmp;
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error_exit:
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if (bp)
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brelse(bp, BC_AGE);
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if (pmp) {
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if (pmp->pm_inusemap)
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free(pmp->pm_inusemap);
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free(pmp);
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}
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errno = error;
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return pmp;
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}
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int
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msdosfs_root(struct msdosfsmount *pmp, struct vnode *vp) {
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struct denode *ndep;
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int error;
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*vp = *pmp->pm_devvp;
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if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) {
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errno = error;
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return -1;
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}
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vp->v_data = ndep;
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return 0;
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}
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