/*- * 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 1.31 1998/08/10 07:22:14 phk Exp $ */ #include <sys/param.h> #include <sys/buf.h> #include <sys/conf.h> #include <sys/disklabel.h> #define DOSPTYP_EXTENDED 5 #define DOSPTYP_EXTENDEDX 15 #define DOSPTYP_ONTRACK 84 #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, u_long mbr_offset)); 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, u_long mbr_offset)); static int check_part(sname, dp, offset, nsectors, ntracks, mbr_offset ) char *sname; struct dos_partition *dp; u_long offset; int nsectors; int ntracks; u_long mbr_offset; { 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 + mbr_offset; 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. Always allow * 1023/255/63. */ if (ssector < ssector1 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1 && chs_scyl == 1023) || (secpercyl != 0 && (ssector1 - ssector) % (1024 * secpercyl) == 0)) || (dp->dp_scyl == 255 && dp->dp_shd == 255 && dp->dp_ssect == 255)) { 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 + mbr_offset; 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) || (secpercyl != 0 && (esector1 - esector) % (1024 * secpercyl) == 0)) || (dp->dp_ecyl == 255 && dp->dp_ehd == 255 && dp->dp_esect == 255)) { 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; if (bootverbose) printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n", sname, dp->dp_typ, ssector1, esector1, (u_long)dp->dp_size, error ? "" : ": OK"); if (ssector != ssector1 && bootverbose) 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 && bootverbose) 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; u_long mbr_offset; char partname[2]; u_long secpercyl; char *sname; struct diskslice *sp; struct diskslices *ssp; mbr_offset = DOSBBSECTOR; reread_mbr: /* Read master boot record. */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART); bp->b_blkno = mbr_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 primary partition table", LOG_PRINTF, 0, (struct disklabel *)NULL); printf("\n"); error = EIO; goto done; } /* Weakly verify it. */ cp = bp->b_data; sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { if (bootverbose) printf("%s: invalid primary partition table: no magic\n", sname); error = EINVAL; goto done; } dp0 = (struct dos_partition *)(cp + DOSPARTOFF); /* Check for "Ontrack Diskmanager". */ for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { if (dp->dp_typ == DOSPTYP_ONTRACK) { if (bootverbose) printf( "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname); bp->b_flags |= B_INVAL | B_AGE; brelse(bp); mbr_offset = 63; goto reread_mbr; } } 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 ncyls; int nsectors; int ntracks; ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1; if (max_ncyls < ncyls) max_ncyls = 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 that we have guessed the geometry right by checking the * partition entries. */ /* * TODO: * As above. * Check for overlaps. * Check against d_secperunit if the latter is reliable. */ error = 0; 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, mbr_offset, max_nsectors, max_ntracks, mbr_offset); } 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). */ secpercyl = (u_long)max_nsectors * max_ntracks; 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; lp->d_ncylinders = lp->d_secperunit / secpercyl; } /* * We are passed a pointer to a suitably initialized minimal * slices "struct" with no dangling pointers in it. Replace it * by a maximal one. This usually oversizes the "struct", but * enlarging it while searching for logical drives would be * inconvenient. */ free(*sspp, M_DEVBUF); ssp = dsmakeslicestruct(MAX_SLICES, lp); *sspp = ssp; /* Initialize normal slices. */ sp = &ssp->dss_slices[BASE_SLICE]; for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) { sp->ds_offset = mbr_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 || sp->ds_type == DOSPTYP_EXTENDEDX) extended(dname, bp->b_dev, strat, lp, ssp, sp->ds_offset, sp->ds_size, sp->ds_offset, max_nsectors, max_ntracks, mbr_offset); 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, mbr_offset) 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; u_long mbr_offset; { struct buf *bp; u_char *cp; int dospart; struct dos_partition *dp; 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, (struct disklabel *)NULL); printf("\n"); goto done; } /* Weakly verify it. */ cp = bp->b_data; if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); if (bootverbose) printf("%s: invalid extended partition table: no magic\n", sname); goto done; } for (dospart = 0, dp = (struct dos_partition *)(bp->b_data + 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 || dp->dp_typ == DOSPTYP_EXTENDEDX) { char buf[32]; sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); snprintf(buf, sizeof(buf), "%s", sname); if (strlen(buf) < sizeof buf - 11) strcat(buf, "<extended>"); check_part(buf, dp, base_ext_offset, nsectors, ntracks, mbr_offset); 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, mbr_offset); 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, mbr_offset); done: bp->b_flags |= B_INVAL | B_AGE; brelse(bp); }