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freebsd-nq/sys/i386/isa/diskslice_machdep.c
Bruce Evans a7d783dddb Add more compatibility cruft: 
- ignore the partition table if it is identical with the bogus one in
  /usr/src/sys/i386/boot/biosboot/start.S.  Honoring the bogus size
  field was fatal.  The error is detected but other compatibilty
  cruft weakens the error handling too much for this case.
- weaken the partition entry checking to allow the following treatments
  of C/H/S addresses when C should be >= 1024:
    (1) allow C = 1023, H = max, S = max.
    (2) allow C to be correct modulo 1024.
  Other compatibilty cruft weakens the error handling to allow all
  C/H/S addresses, but there too many errors were reported.

Improve error messages:
- print C/H/S addresses if relevant.
- distinguish primary partition table from extended partition tables.
- don't use diskerr() except for i/o errors.
1995-03-25 12:07:31 +00:00

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/*-
* Copyright (c) 1994 Bruce D. Evans.
* All rights reserved.
*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
* from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
* $Id: diskslice_machdep.c,v 1.8 1995/03/15 16:25:08 bde Exp $
*/
#include <stddef.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#define DOSPTYP_EXTENDED 5
#include <sys/diskslice.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#define TRACE(str) do { if (dsi_debug) printf str; } while (0)
static volatile u_char dsi_debug;
static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
};
static int check_part __P((char *sname, struct dos_partition *dp,
u_long offset, int nsectors, int ntracks));
static void extended __P((char *dname, dev_t dev, d_strategy_t *strat,
struct disklabel *lp, struct diskslices *ssp,
u_long ext_offset, u_long ext_size,
u_long base_ext_offset, int nsectors, int ntracks));
static int
check_part(sname, dp, offset, nsectors, ntracks)
char *sname;
struct dos_partition *dp;
u_long offset;
int nsectors;
int ntracks;
{
int chs_ecyl;
int chs_esect;
int chs_scyl;
int chs_ssect;
int error;
u_long esector;
u_long esector1;
u_long secpercyl;
u_long ssector;
u_long ssector1;
secpercyl = (u_long)nsectors * ntracks;
chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
chs_ssect = DPSECT(dp->dp_ssect);
ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl;
ssector1 = offset + dp->dp_start;
/*
* If ssector1 is on a cylinder >= 1024, then ssector can't be right.
* Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
* apart from the cylinder being reduced modulo 1024.
*/
if (ssector < ssector1
&& ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
&& chs_scyl == 1023)
|| (ssector1 - ssector) % (1024 * secpercyl) == 0)) {
TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
ssector = ssector1;
}
chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
chs_esect = DPSECT(dp->dp_esect);
esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl;
esector1 = ssector1 + dp->dp_size - 1;
/* Allow certain bogus C/H/S values for esector, as above. */
if (esector < esector1
&& ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
&& chs_ecyl == 1023)
|| (esector1 - esector) % (1024 * secpercyl) == 0)) {
TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
esector = esector1;
}
error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
printf("%s: start %lu, end = %lu, size %lu%s\n",
sname, ssector1, esector1, dp->dp_size, error ? "" : ": OK");
if (ssector != ssector1)
printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
sname, chs_scyl, dp->dp_shd, chs_ssect,
ssector, ssector1);
if (esector != esector1)
printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
sname, chs_ecyl, dp->dp_ehd, chs_esect,
esector, esector1);
return (error);
}
int
dsinit(dname, dev, strat, lp, sspp)
char *dname;
dev_t dev;
d_strategy_t *strat;
struct disklabel *lp;
struct diskslices **sspp;
{
struct buf *bp;
u_char *cp;
int dospart;
struct dos_partition *dp;
struct dos_partition *dp0;
int error;
int max_ncyls;
int max_nsectors;
int max_ntracks;
char partname[2];
u_long secpercyl;
int slice;
char *sname;
struct diskslice *sp;
struct diskslices *ssp;
/*
* Allocate a dummy slices "struct" and initialize it to contain
* only an empty compatibility slice (pointing to itself) and a
* whole disk slice (covering the disk as described by the label).
* If there is an error, then the dummy struct becomes final.
*/
ssp = malloc(offsetof(struct diskslices, dss_slices)
+ BASE_SLICE * sizeof *sp, M_DEVBUF, M_WAITOK);
*sspp = ssp;
ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
ssp->dss_nslices = BASE_SLICE;
sp = &ssp->dss_slices[0];
bzero(sp, BASE_SLICE * sizeof *sp);
sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
/* Read master boot record. */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
bp->b_blkno = DOSBBSECTOR;
bp->b_bcount = lp->d_secsize;
bp->b_flags = B_BUSY | B_READ;
(*strat)(bp);
if (biowait(bp) != 0) {
diskerr(bp, dname, "error reading primary partition table",
LOG_PRINTF, 0, lp);
printf("\n");
error = EIO;
goto done;
}
/* Weakly verify it. */
cp = bp->b_un.b_addr;
sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
partname);
if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
printf("%s: invalid primary partition table: no magic\n",
sname);
error = EINVAL;
goto done;
}
dp0 = (struct dos_partition *)(cp + DOSPARTOFF);
if (bcmp(dp0, historical_bogus_partition_table,
sizeof historical_bogus_partition_table) == 0) {
TRACE(("%s: invalid primary partition table: historical\n",
sname));
error = EINVAL;
goto done;
}
/* Guess the geometry. */
/*
* TODO:
* Perhaps skip entries with 0 size.
* Perhaps only look at entries of type DOSPTYP_386BSD.
*/
max_ncyls = 0;
max_nsectors = 0;
max_ntracks = 0;
for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
int nsectors;
int ntracks;
max_ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect);
if (max_ncyls < max_ncyls)
max_ncyls = max_ncyls;
nsectors = DPSECT(dp->dp_esect);
if (max_nsectors < nsectors)
max_nsectors = nsectors;
ntracks = dp->dp_ehd + 1;
if (max_ntracks < ntracks)
max_ntracks = ntracks;
}
/* Check the geometry. */
/*
* TODO:
* As above.
* Check for overlaps.
* Check against d_secperunit if the latter is reliable.
*/
error = 0;
secpercyl = (u_long)max_nsectors * max_ntracks;
for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
&& dp->dp_start == 0 && dp->dp_size == 0)
continue;
sname = dsname(dname, dkunit(dev), BASE_SLICE + dospart,
RAW_PART, partname);
/*
* Temporarily ignore errors from this check. We could
* simplify things by accepting the table eariler if we
* always ignore errors here. Perhaps we should always
* accept the table if the magic is right but not let
* bad entries affect the geometry.
*/
check_part(sname, dp, (u_long)0, max_nsectors, max_ntracks);
}
if (error != 0)
goto done;
/*
* Accept the DOS partition table.
* First adjust the label (we have been careful not to change it
* before we can guarantee success).
*/
if (secpercyl != 0) {
u_long secperunit;
lp->d_nsectors = max_nsectors;
lp->d_ntracks = max_ntracks;
lp->d_secpercyl = secpercyl;
secperunit = secpercyl * max_ncyls;
if (lp->d_secperunit < secperunit)
lp->d_secperunit = secperunit;
}
/*
* Free the dummy slices "struct" and allocate a real new one.
* Initialize special slices as above.
*/
free(ssp, M_DEVBUF);
ssp = malloc(offsetof(struct diskslices, dss_slices)
#define MAX_SLICES_SUPPORTED MAX_SLICES /* was (BASE_SLICE + NDOSPART) */
+ MAX_SLICES_SUPPORTED * sizeof *sp, M_DEVBUF, M_WAITOK);
*sspp = ssp;
ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
sp = &ssp->dss_slices[0];
bzero(sp, MAX_SLICES_SUPPORTED * sizeof *sp);
sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
/* Initialize normal slices. */
sp += BASE_SLICE;
for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
sp->ds_offset = dp->dp_start;
sp->ds_size = dp->dp_size;
sp->ds_type = dp->dp_typ;
#if 0
lp->d_subtype |= (lp->d_subtype & 3) | dospart
| DSTYPE_INDOSPART;
#endif
}
ssp->dss_nslices = BASE_SLICE + NDOSPART;
/* Handle extended partitions. */
sp -= NDOSPART;
for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
if (sp->ds_type == DOSPTYP_EXTENDED)
extended(dname, bp->b_dev, strat, lp, ssp,
sp->ds_offset, sp->ds_size, sp->ds_offset,
max_nsectors, max_ntracks);
done:
bp->b_flags = B_INVAL | B_AGE;
brelse(bp);
if (error == EINVAL)
error = 0;
return (error);
}
void
extended(dname, dev, strat, lp, ssp, ext_offset, ext_size, base_ext_offset,
nsectors, ntracks)
char *dname;
dev_t dev;
struct disklabel *lp;
d_strategy_t *strat;
struct diskslices *ssp;
u_long ext_offset;
u_long ext_size;
u_long base_ext_offset;
int nsectors;
int ntracks;
{
struct buf *bp;
u_char *cp;
int dospart;
struct dos_partition *dp;
int end_slice;
u_long ext_offsets[NDOSPART];
u_long ext_sizes[NDOSPART];
char partname[2];
int slice;
char *sname;
struct diskslice *sp;
/* Read extended boot record. */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
bp->b_blkno = ext_offset;
bp->b_bcount = lp->d_secsize;
bp->b_flags = B_BUSY | B_READ;
(*strat)(bp);
if (biowait(bp) != 0) {
diskerr(bp, dname, "error reading extended partition table",
LOG_PRINTF, 0, lp);
printf("\n");
goto done;
}
/* Weakly verify it. */
cp = bp->b_un.b_addr;
if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
partname);
printf("%s: invalid extended partition table: no magic\n",
sname);
goto done;
}
for (dospart = 0,
dp = (struct dos_partition *)(bp->b_un.b_addr + DOSPARTOFF),
slice = ssp->dss_nslices, sp = &ssp->dss_slices[slice];
dospart < NDOSPART; dospart++, dp++) {
ext_sizes[dospart] = 0;
if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
&& dp->dp_start == 0 && dp->dp_size == 0)
continue;
if (dp->dp_typ == DOSPTYP_EXTENDED) {
char buf[32];
sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE,
RAW_PART, partname);
strcpy(buf, sname);
if (strlen(buf) < sizeof buf - 11)
strcat(buf, "<extended>");
check_part(buf, dp, base_ext_offset, nsectors,
ntracks);
ext_offsets[dospart] = base_ext_offset + dp->dp_start;
ext_sizes[dospart] = dp->dp_size;
} else {
sname = dsname(dname, dkunit(dev), slice, RAW_PART,
partname);
check_part(sname, dp, ext_offset, nsectors, ntracks);
if (slice >= MAX_SLICES) {
printf("%s: too many slices\n", sname);
slice++;
continue;
}
sp->ds_offset = ext_offset + dp->dp_start;
sp->ds_size = dp->dp_size;
sp->ds_type = dp->dp_typ;
ssp->dss_nslices++;
slice++;
sp++;
}
}
/* If we found any more slices, recursively find all the subslices. */
for (dospart = 0; dospart < NDOSPART; dospart++)
if (ext_sizes[dospart] != 0)
extended(dname, dev, strat, lp, ssp,
ext_offsets[dospart], ext_sizes[dospart],
base_ext_offset, nsectors, ntracks);
done:
bp->b_flags = B_INVAL | B_AGE;
brelse(bp);
}
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