/*- * 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 $ * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $ * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.8 2004/06/02 19:31:02 dillon Exp $ */ #include #include #include #include #ifdef PC98 #define PC98_ATCOMPAT #define dsinit atcompat_dsinit #endif #include #define DOSPTYP_EXTENDED 5 #define DOSPTYP_EXTENDEDX 15 #define DOSPTYP_ONTRACK 84 #include #include #include #include #include #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 (char *sname, struct dos_partition *dp, u_long offset, int nsectors, int ntracks, u_long mbr_offset); static void mbr_extended (dev_t dev, 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, int level); static int mbr_setslice (char *sname, struct disklabel *lp, struct diskslice *sp, struct dos_partition *dp, u_long br_offset); static int check_part(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(dev_t dev, struct disklabel *lp, struct diskslices **sspp) { struct buf *bp; u_char *cp; int dospart; struct dos_partition *dp; struct dos_partition *dp0; struct dos_partition dpcopy[NDOSPART]; 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; dev_t wdev; mbr_offset = DOSBBSECTOR; reread_mbr: /* Read master boot record. */ wdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART); bp = geteblk((int)lp->d_secsize); bp->b_dev = wdev; bp->b_blkno = mbr_offset; bp->b_bcount = lp->d_secsize; bp->b_flags |= B_READ; BUF_STRATEGY(bp, 1); if (biowait(bp) != 0) { diskerr(bp, wdev, "reading primary partition table: error", LOG_PRINTF, 0, (struct disklabel *)NULL); printf("\n"); error = EIO; goto done; } /* Weakly verify it. */ cp = bp->b_data; sname = dsname(dev, 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; } /* Make a copy of the partition table to avoid alignment problems. */ memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); dp0 = &dpcopy[0]; /* 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(dev, 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) { #if 0 u_long secperunit; #endif lp->d_nsectors = max_nsectors; lp->d_ntracks = max_ntracks; lp->d_secpercyl = secpercyl; /* * Temporarily, don't even consider adjusting the drive's * size, since the adjusted size may exceed the hardware's * addressing capabilities. The adjustment helped mainly * for ancient MFM drives with > 1024 cylinders, but now * breaks at least IDE drives with 63*16*65536 sectors if * they are controlled by the wd driver in CHS mode. */ #if 0 secperunit = secpercyl * max_ncyls; if (lp->d_secperunit < secperunit) lp->d_secperunit = secperunit; #endif 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++) { sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, RAW_PART, partname); (void)mbr_setslice(sname, lp, sp, dp, mbr_offset); } 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) { mbr_extended(wdev, lp, ssp, sp->ds_offset, sp->ds_size, sp->ds_offset, max_nsectors, max_ntracks, mbr_offset, 1); } } /* * mbr_extended() abuses ssp->dss_nslices for the number of slices * that would be found if there were no limit on the number of slices * in *ssp. Cut it back now. */ if (ssp->dss_nslices > MAX_SLICES) ssp->dss_nslices = MAX_SLICES; done: bp->b_flags |= B_INVAL | B_AGE; brelse(bp); if (error == EINVAL) error = 0; return (error); } void mbr_extended(dev_t dev, 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, int level) { struct buf *bp; u_char *cp; int dospart; struct dos_partition *dp; struct dos_partition dpcopy[NDOSPART]; u_long ext_offsets[NDOSPART]; u_long ext_sizes[NDOSPART]; char partname[2]; int slice; char *sname; struct diskslice *sp; if (level >= 16) { printf( "%s: excessive recursion in search for slices; aborting search\n", devtoname(dev)); return; } /* 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_READ; BUF_STRATEGY(bp, 1); if (biowait(bp) != 0) { diskerr(bp, dev, "reading extended partition table: error", 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(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); if (bootverbose) printf("%s: invalid extended partition table: no magic\n", sname); goto done; } /* Make a copy of the partition table to avoid alignment problems. */ memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); slice = ssp->dss_nslices; for (dospart = 0, dp = &dpcopy[0]; 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) { static char buf[32]; sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); snprintf(buf, sizeof(buf), "%s", sname); if (strlen(buf) < sizeof buf - 11) strcat(buf, ""); 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(dev, 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 = &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(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(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