7b17f8ffbd
subr_diskmbr.c:
Don't "helpfully" enlarge our idea of the disk size to cover all the
primary slices. Instead, truncate or discard slices that don't seem
to be on the disk. The enlargement was a hack for disks that don't
report their size (e.g., MFM disks). It is just wrong in general.
wd.c:
In CHS mode, limit the disk size so that cylinder numbers >= 65536
cannot occur. This normally only affects disks larger than 33.8GB.
CHS mode accesses to addresses above the limit are now properly broken
(an error is returned instead of garbage for reads and disk corruption
for writes).
PR: 15611
Reviewed by: readers of freebsd-bugs did not respond to a request
for review
534 lines
15 KiB
C
534 lines
15 KiB
C
/*-
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* Copyright (c) 1994 Bruce D. Evans.
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* All rights reserved.
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*
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* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
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* All rights reserved.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
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* from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#ifdef PC98
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#define PC98_ATCOMPAT
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#define dsinit atcompat_dsinit
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#endif
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#include <sys/disklabel.h>
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#define DOSPTYP_EXTENDED 5
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#define DOSPTYP_EXTENDEDX 15
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#define DOSPTYP_ONTRACK 84
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#include <sys/diskslice.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#define TRACE(str) do { if (dsi_debug) printf str; } while (0)
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static volatile u_char dsi_debug;
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static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
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};
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static int check_part __P((char *sname, struct dos_partition *dp,
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u_long offset, int nsectors, int ntracks,
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u_long mbr_offset));
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static void mbr_extended __P((dev_t dev, struct disklabel *lp,
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struct diskslices *ssp, u_long ext_offset,
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u_long ext_size, u_long base_ext_offset,
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int nsectors, int ntracks, u_long mbr_offset,
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int level));
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static int mbr_setslice __P((char *sname, struct disklabel *lp,
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struct diskslice *sp, struct dos_partition *dp,
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u_long br_offset));
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static int
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check_part(sname, dp, offset, nsectors, ntracks, mbr_offset )
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char *sname;
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struct dos_partition *dp;
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u_long offset;
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int nsectors;
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int ntracks;
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u_long mbr_offset;
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{
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int chs_ecyl;
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int chs_esect;
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int chs_scyl;
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int chs_ssect;
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int error;
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u_long esector;
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u_long esector1;
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u_long secpercyl;
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u_long ssector;
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u_long ssector1;
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secpercyl = (u_long)nsectors * ntracks;
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chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
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chs_ssect = DPSECT(dp->dp_ssect);
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ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
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+ mbr_offset;
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ssector1 = offset + dp->dp_start;
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/*
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* If ssector1 is on a cylinder >= 1024, then ssector can't be right.
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* Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
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* apart from the cylinder being reduced modulo 1024. Always allow
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* 1023/255/63.
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*/
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if ((ssector < ssector1
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&& ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
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&& chs_scyl == 1023)
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|| (secpercyl != 0
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&& (ssector1 - ssector) % (1024 * secpercyl) == 0)))
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|| (dp->dp_scyl == 255 && dp->dp_shd == 255
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&& dp->dp_ssect == 255)) {
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TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
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sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
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ssector = ssector1;
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}
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chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
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chs_esect = DPSECT(dp->dp_esect);
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esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
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+ mbr_offset;
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esector1 = ssector1 + dp->dp_size - 1;
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/* Allow certain bogus C/H/S values for esector, as above. */
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if ((esector < esector1
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&& ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
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&& chs_ecyl == 1023)
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|| (secpercyl != 0
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&& (esector1 - esector) % (1024 * secpercyl) == 0)))
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|| (dp->dp_ecyl == 255 && dp->dp_ehd == 255
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&& dp->dp_esect == 255)) {
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TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
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sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
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esector = esector1;
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}
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error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
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if (bootverbose)
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printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
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sname, dp->dp_typ, ssector1, esector1,
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(u_long)dp->dp_size, error ? "" : ": OK");
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if (ssector != ssector1 && bootverbose)
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printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
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sname, chs_scyl, dp->dp_shd, chs_ssect,
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ssector, ssector1);
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if (esector != esector1 && bootverbose)
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printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
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sname, chs_ecyl, dp->dp_ehd, chs_esect,
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esector, esector1);
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return (error);
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}
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int
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dsinit(dev, lp, sspp)
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dev_t dev;
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struct disklabel *lp;
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struct diskslices **sspp;
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{
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struct buf *bp;
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u_char *cp;
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int dospart;
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struct dos_partition *dp;
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struct dos_partition *dp0;
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struct dos_partition dpcopy[NDOSPART];
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int error;
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int max_ncyls;
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int max_nsectors;
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int max_ntracks;
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u_long mbr_offset;
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char partname[2];
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u_long secpercyl;
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char *sname;
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struct diskslice *sp;
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struct diskslices *ssp;
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mbr_offset = DOSBBSECTOR;
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reread_mbr:
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/* Read master boot record. */
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
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bp->b_blkno = mbr_offset;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags |= B_READ;
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BUF_STRATEGY(bp, 1);
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if (biowait(bp) != 0) {
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diskerr(bp, "reading primary partition table: error",
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LOG_PRINTF, 0, (struct disklabel *)NULL);
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printf("\n");
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error = EIO;
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goto done;
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}
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/* Weakly verify it. */
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cp = bp->b_data;
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sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
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if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
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if (bootverbose)
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printf("%s: invalid primary partition table: no magic\n",
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sname);
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error = EINVAL;
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goto done;
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}
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/* Make a copy of the partition table to avoid alignment problems. */
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memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
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dp0 = &dpcopy[0];
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/* Check for "Ontrack Diskmanager". */
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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if (dp->dp_typ == DOSPTYP_ONTRACK) {
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if (bootverbose)
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printf(
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"%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
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bp->b_flags |= B_INVAL | B_AGE;
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brelse(bp);
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mbr_offset = 63;
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goto reread_mbr;
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}
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}
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if (bcmp(dp0, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table) == 0) {
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TRACE(("%s: invalid primary partition table: historical\n",
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sname));
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error = EINVAL;
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goto done;
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}
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/* Guess the geometry. */
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/*
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* TODO:
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* Perhaps skip entries with 0 size.
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* Perhaps only look at entries of type DOSPTYP_386BSD.
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*/
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max_ncyls = 0;
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max_nsectors = 0;
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max_ntracks = 0;
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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int ncyls;
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int nsectors;
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int ntracks;
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ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
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if (max_ncyls < ncyls)
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max_ncyls = ncyls;
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nsectors = DPSECT(dp->dp_esect);
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if (max_nsectors < nsectors)
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max_nsectors = nsectors;
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ntracks = dp->dp_ehd + 1;
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if (max_ntracks < ntracks)
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max_ntracks = ntracks;
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}
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/*
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* Check that we have guessed the geometry right by checking the
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* partition entries.
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*/
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/*
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* TODO:
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* As above.
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* Check for overlaps.
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* Check against d_secperunit if the latter is reliable.
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*/
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error = 0;
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
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&& dp->dp_start == 0 && dp->dp_size == 0)
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continue;
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sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
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RAW_PART, partname);
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/*
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* Temporarily ignore errors from this check. We could
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* simplify things by accepting the table eariler if we
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* always ignore errors here. Perhaps we should always
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* accept the table if the magic is right but not let
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* bad entries affect the geometry.
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*/
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check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
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mbr_offset);
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}
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if (error != 0)
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goto done;
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/*
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* Accept the DOS partition table.
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* First adjust the label (we have been careful not to change it
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* before we can guarantee success).
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*/
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secpercyl = (u_long)max_nsectors * max_ntracks;
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if (secpercyl != 0) {
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#if 0
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u_long secperunit;
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#endif
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lp->d_nsectors = max_nsectors;
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lp->d_ntracks = max_ntracks;
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lp->d_secpercyl = secpercyl;
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/*
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* Temporarily, don't even consider adjusting the drive's
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* size, since the adjusted size may exceed the hardware's
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* addressing capabilities. The adjustment helped mainly
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* for ancient MFM drives with > 1024 cylinders, but now
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* breaks at least IDE drives with 63*16*65536 sectors if
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* they are controlled by the wd driver in CHS mode.
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*/
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#if 0
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secperunit = secpercyl * max_ncyls;
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if (lp->d_secperunit < secperunit)
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lp->d_secperunit = secperunit;
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#endif
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lp->d_ncylinders = lp->d_secperunit / secpercyl;
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}
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/*
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* We are passed a pointer to a suitably initialized minimal
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* slices "struct" with no dangling pointers in it. Replace it
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* by a maximal one. This usually oversizes the "struct", but
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* enlarging it while searching for logical drives would be
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* inconvenient.
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*/
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free(*sspp, M_DEVBUF);
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ssp = dsmakeslicestruct(MAX_SLICES, lp);
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*sspp = ssp;
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/* Initialize normal slices. */
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sp = &ssp->dss_slices[BASE_SLICE];
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
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sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
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RAW_PART, partname);
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(void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
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}
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ssp->dss_nslices = BASE_SLICE + NDOSPART;
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/* Handle extended partitions. */
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sp -= NDOSPART;
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for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
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if (sp->ds_type == DOSPTYP_EXTENDED ||
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sp->ds_type == DOSPTYP_EXTENDEDX)
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mbr_extended(bp->b_dev, lp, ssp,
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sp->ds_offset, sp->ds_size, sp->ds_offset,
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max_nsectors, max_ntracks, mbr_offset, 1);
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/*
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* mbr_extended() abuses ssp->dss_nslices for the number of slices
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* that would be found if there were no limit on the number of slices
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* in *ssp. Cut it back now.
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*/
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if (ssp->dss_nslices > MAX_SLICES)
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ssp->dss_nslices = MAX_SLICES;
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done:
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bp->b_flags |= B_INVAL | B_AGE;
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brelse(bp);
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if (error == EINVAL)
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error = 0;
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return (error);
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}
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void
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mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
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ntracks, mbr_offset, level)
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dev_t dev;
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struct disklabel *lp;
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struct diskslices *ssp;
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u_long ext_offset;
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u_long ext_size;
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u_long base_ext_offset;
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int nsectors;
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int ntracks;
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u_long mbr_offset;
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int level;
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{
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struct buf *bp;
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u_char *cp;
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int dospart;
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struct dos_partition *dp;
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struct dos_partition dpcopy[NDOSPART];
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u_long ext_offsets[NDOSPART];
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u_long ext_sizes[NDOSPART];
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char partname[2];
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int slice;
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char *sname;
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struct diskslice *sp;
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if (level >= 16) {
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printf(
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"%s: excessive recursion in search for slices; aborting search\n",
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devtoname(dev));
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return;
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}
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/* Read extended boot record. */
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = dev;
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bp->b_blkno = ext_offset;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags |= B_READ;
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BUF_STRATEGY(bp, 1);
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if (biowait(bp) != 0) {
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diskerr(bp, "reading extended partition table: error",
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LOG_PRINTF, 0, (struct disklabel *)NULL);
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printf("\n");
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goto done;
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}
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/* Weakly verify it. */
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cp = bp->b_data;
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if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
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sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
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partname);
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if (bootverbose)
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printf("%s: invalid extended partition table: no magic\n",
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sname);
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goto done;
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}
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/* Make a copy of the partition table to avoid alignment problems. */
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memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
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|
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slice = ssp->dss_nslices;
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|
for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
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dospart++, dp++) {
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ext_sizes[dospart] = 0;
|
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if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
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&& dp->dp_start == 0 && dp->dp_size == 0)
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continue;
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if (dp->dp_typ == DOSPTYP_EXTENDED ||
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dp->dp_typ == DOSPTYP_EXTENDEDX) {
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static char buf[32];
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sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
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RAW_PART, partname);
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snprintf(buf, sizeof(buf), "%s", sname);
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if (strlen(buf) < sizeof buf - 11)
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|
strcat(buf, "<extended>");
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check_part(buf, dp, base_ext_offset, nsectors,
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ntracks, mbr_offset);
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ext_offsets[dospart] = base_ext_offset + dp->dp_start;
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ext_sizes[dospart] = dp->dp_size;
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} else {
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sname = dsname(dev, dkunit(dev), slice, RAW_PART,
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partname);
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|
check_part(sname, dp, ext_offset, nsectors, ntracks,
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mbr_offset);
|
|
if (slice >= MAX_SLICES) {
|
|
printf("%s: too many slices\n", sname);
|
|
slice++;
|
|
continue;
|
|
}
|
|
sp = &ssp->dss_slices[slice];
|
|
if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
|
|
continue;
|
|
slice++;
|
|
}
|
|
}
|
|
ssp->dss_nslices = slice;
|
|
|
|
/* If we found any more slices, recursively find all the subslices. */
|
|
for (dospart = 0; dospart < NDOSPART; dospart++)
|
|
if (ext_sizes[dospart] != 0)
|
|
mbr_extended(dev, lp, ssp, ext_offsets[dospart],
|
|
ext_sizes[dospart], base_ext_offset,
|
|
nsectors, ntracks, mbr_offset, ++level);
|
|
|
|
done:
|
|
bp->b_flags |= B_INVAL | B_AGE;
|
|
brelse(bp);
|
|
}
|
|
|
|
static int
|
|
mbr_setslice(sname, lp, sp, dp, br_offset)
|
|
char *sname;
|
|
struct disklabel *lp;
|
|
struct diskslice *sp;
|
|
struct dos_partition *dp;
|
|
u_long br_offset;
|
|
{
|
|
u_long offset;
|
|
u_long size;
|
|
|
|
offset = br_offset + dp->dp_start;
|
|
if (offset > lp->d_secperunit || offset < br_offset) {
|
|
printf(
|
|
"%s: slice starts beyond end of the disk: rejecting it\n",
|
|
sname);
|
|
return (1);
|
|
}
|
|
size = lp->d_secperunit - offset;
|
|
if (size >= dp->dp_size)
|
|
size = dp->dp_size;
|
|
else
|
|
printf(
|
|
"%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
|
|
sname, (u_long)dp->dp_size, size);
|
|
sp->ds_offset = offset;
|
|
sp->ds_size = size;
|
|
sp->ds_type = dp->dp_typ;
|
|
#ifdef PC98_ATCOMPAT
|
|
/* Fake FreeBSD(98). */
|
|
if (sp->ds_type == DOSPTYP_386BSD)
|
|
sp->ds_type = 0x94;
|
|
#endif
|
|
#if 0
|
|
lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
#ifdef __alpha__
|
|
void
|
|
alpha_fix_srm_checksum(bp)
|
|
struct buf *bp;
|
|
{
|
|
u_int64_t *p;
|
|
u_int64_t sum;
|
|
int i;
|
|
|
|
p = (u_int64_t *) bp->b_data;
|
|
sum = 0;
|
|
for (i = 0; i < 63; i++)
|
|
sum += p[i];
|
|
p[63] = sum;
|
|
}
|
|
#endif
|