213 lines
6.2 KiB
C
213 lines
6.2 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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* $Id:
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*/
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#include <stddef.h>
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#include <sys/param.h>
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#include <sys/buf.h>
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#include <sys/disklabel.h>
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#include <sys/diskslice.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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int
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dsinit(dname, dev, strat, lp, sspp)
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char *dname;
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dev_t dev;
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d_strategy_t *strat;
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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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struct dos_partition *dp;
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struct dos_partition *dp0;
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int error;
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int max_nsectors;
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int max_ntracks;
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u_long secpercyl;
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int slice;
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struct diskslice *sp;
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struct diskslices *ssp;
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/*
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* Free old slices "struct", if any, and allocate a dummy new one.
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*/
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if (*sspp != NULL)
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free(*sspp, M_DEVBUF);
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ssp = malloc(offsetof(struct diskslices, dss_slices) + sizeof(*sp),
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M_DEVBUF, M_WAITOK);
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*sspp = ssp;
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/*
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* Initialize dummy slice. If there is an error, this becomes the
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* only slice, and no more restrictive than the (dummy) label.
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*/
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sp = &ssp->dss_slices[0];
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bzero(sp, sizeof *sp);
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sp->ds_size = lp->d_secperunit;
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ssp->dss_nslices = 1;
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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 = DOSBBSECTOR;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags = B_BUSY | B_READ;
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(*strat)(bp);
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if (biowait(bp) != 0) {
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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_un.b_addr;
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if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
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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_nsectors = 0;
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max_ntracks = 0;
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dp0 = (struct dos_partition *)(cp + DOSPARTOFF);
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for (dp = dp0, slice = 1; slice <= NDOSPART; dp++, slice++) {
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int nsectors;
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int ntracks;
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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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/* Check the geometry. */
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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 or adjust against d_ncylinders and d_secperunit.
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*/
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error = 0;
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secpercyl = max_nsectors * max_ntracks;
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for (dp = dp0, slice = 1; slice <= NDOSPART; dp++, slice++) {
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u_long esector;
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u_long esector1;
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u_long ssector;
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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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ssector = DPSECT(dp->dp_ssect) - 1 + dp->dp_shd * max_nsectors
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+ DPCYL(dp->dp_scyl, dp->dp_ssect) * secpercyl;
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esector = DPSECT(dp->dp_esect) - 1 + dp->dp_ehd * max_nsectors
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+ DPCYL(dp->dp_ecyl, dp->dp_esect) * secpercyl;
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esector1 = dp->dp_start + dp->dp_size - 1;
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if (ssector != dp->dp_start || esector != esector1)
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error = EINVAL;
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#if 1
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else
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printf("%s%ds%d: start %lu, end = %lu, size %lu: OK\n",
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dname, dkunit(dev), slice, ssector, esector,
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dp->dp_size);
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if (ssector != dp->dp_start)
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printf(
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"%s%ds%d: C/H/S start %lu != start %lu: invalid\n",
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dname, dkunit(dev), slice, ssector,
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dp->dp_start);
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if (esector != esector1)
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printf(
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"%s%ds%d: C/H/S end %lu != end %lu: invalid\n",
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dname, dkunit(dev), slice, esector, esector1);
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#endif
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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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* We're not handling extended partitions yet, so there are always
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* 1 + NDOSPART slices.
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*/
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if (dkslice(dev) >= 1 + NDOSPART) {
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error = ENXIO;
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goto done;
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}
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/*
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* Accept the DOS partition table.
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* Free dummy slices "struct" and allocate a real new one.
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*/
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free(ssp, M_DEVBUF);
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ssp = malloc(offsetof(struct diskslices, dss_slices)
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+ (1 + NDOSPART) * sizeof(*sp), M_DEVBUF, M_WAITOK);
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*sspp = ssp;
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sp = &ssp->dss_slices[0];
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bzero(sp, (1 + NDOSPART) * sizeof *sp);
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sp->ds_size = lp->d_secperunit;
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sp++;
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for (dp = dp0, slice = 1; slice <= NDOSPART; dp++, slice++, sp++) {
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sp->ds_offset = dp->dp_start;
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sp->ds_size = dp->dp_size;
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}
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ssp->dss_nslices = 1 + NDOSPART;
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if (max_nsectors != 0) {
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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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#if 0
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lp->d_secperunit = what?;
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lp->d_subtype |= (lp->d_subtype & 3) + (slice - 1) | DSTYPE_INDOSPART;
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#endif
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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 = (dkslice(dev) == WHOLE_DISK_SLICE ? 0 : ENXIO);
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return (error);
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}
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