NetBSD-5.0.2/sys/arch/macppc/macppc/disksubr.c
/* $NetBSD: disksubr.c,v 1.43 2008/01/02 11:48:26 ad Exp $ */
/*
* 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. 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.
*
* @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
*/
/*-
* Copyright (C) 1993 Allen K. Briggs, Chris P. Caputo,
* Michael L. Finch, Bradley A. Grantham, and
* Lawrence A. Kesteloot
* 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 Alice Group.
* 4. The names of the Alice Group or any of its members may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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.
*
*/
/*
* Copyright (C) 1996 Wolfgang Solfrank.
* Copyright (C) 1996 TooLs GmbH.
* 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 TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
/* rewritten, 2-5-93 MLF */
/* its alot cleaner now, and adding support for new partition types
* is possible without causing serious brain-damage
* known bugs:
* 1) when only an HFS_PART part exists on a drive it gets assigned to "B"
* this is because of line 623 of sd.c, I think this line should go.
* 2) /sbin/disklabel expects the whole disk to be in "D", we put it in
* "C" (I think) and we don't set that position in the disklabel structure
* as used. Again, not my fault.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.43 2008/01/02 11:48:26 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/bootblock.h>
#include <sys/syslog.h>
#include <sys/bswap.h>
#define NUM_PARTS 32
#define ROOT_PART 1
#define UFS_PART 2
#define SWAP_PART 3
#define HFS_PART 4
#define SCRATCH_PART 5
static int getFreeLabelEntry __P((struct disklabel *));
static int whichType __P((struct part_map_entry *, u_int8_t *, int *));
static void setpartition __P((struct part_map_entry *,
struct partition *, int));
static int getNamedType __P((struct part_map_entry *, int,
struct disklabel *, int, int, int *));
static const char *read_mac_label __P((dev_t, void (*)(struct buf *),
struct disklabel *, struct cpu_disklabel *));
static const char *read_dos_label __P((dev_t, void (*)(struct buf *),
struct disklabel *, struct cpu_disklabel *));
static int get_netbsd_label __P((dev_t, void (*)(struct buf *),
struct disklabel *, struct cpu_disklabel *));
/*
* Find an entry in the disk label that is unused and return it
* or -1 if no entry
*/
static int
getFreeLabelEntry(lp)
struct disklabel *lp;
{
int i = 0;
for (i = 0; i < MAXPARTITIONS; i++) {
if ((i != RAW_PART)
&& (lp->d_partitions[i].p_fstype == FS_UNUSED))
return i;
}
return -1;
}
/*
* figure out what the type of the given part is and return it
*/
static int
whichType(struct part_map_entry *part, u_int8_t *fstype, int *clust)
{
struct blockzeroblock *bzb;
char typestr[32], *s;
int type;
/* Set default unix partition type. Certain partition types can
* specify a different partition type. */
*fstype = FS_OTHER;
*clust = 0; /* only A/UX partitions not in cluster 0 */
if (part->pmSig != PART_ENTRY_MAGIC || part->pmPartType[0] == '\0')
return 0;
strncpy(typestr, (char *)part->pmPartType, sizeof(typestr));
typestr[sizeof(typestr) - 1] = '\0';
for (s = typestr; *s; s++)
if ((*s >= 'a') && (*s <= 'z'))
*s = (*s - 'a' + 'A');
if (strncmp(PART_TYPE_DRIVER, typestr, strlen(PART_TYPE_DRIVER)) == 0 ||
strcmp(PART_TYPE_DRIVER43, typestr) == 0 ||
strcmp(PART_TYPE_DRIVERATA, typestr) == 0 ||
strcmp(PART_TYPE_DRIVERIOKIT, typestr) == 0 ||
strcmp(PART_TYPE_FWDRIVER, typestr) == 0 ||
strcmp(PART_TYPE_FWB_COMPONENT, typestr) == 0 ||
strcmp(PART_TYPE_PARTMAP, typestr) == 0 ||
strcmp(PART_TYPE_PATCHES, typestr) == 0)
type = 0;
else if (strcmp(PART_TYPE_NBSD_PPCBOOT, typestr) == 0) {
type = ROOT_PART;
bzb = (struct blockzeroblock *)(&part->pmBootArgs);
if ((bzb->bzbMagic == BZB_MAGIC) &&
(bzb->bzbType < FSMAXTYPES))
*fstype = bzb->bzbType;
else
*fstype = FS_BSDFFS;
} else if (strcmp(PART_TYPE_NETBSD, typestr) == 0 ||
strcmp(PART_TYPE_NBSD_68KBOOT, typestr) == 0) {
type = UFS_PART;
bzb = (struct blockzeroblock *)(&part->pmBootArgs);
if ((bzb->bzbMagic == BZB_MAGIC) &&
(bzb->bzbType < FSMAXTYPES))
*fstype = bzb->bzbType;
else
*fstype = FS_BSDFFS;
} else if (strcmp(PART_TYPE_UNIX, typestr) == 0) {
/* unix part, swap, root, usr */
bzb = (struct blockzeroblock *)(&part->pmBootArgs);
*clust = bzb->bzbCluster;
if (bzb->bzbMagic != BZB_MAGIC) {
type = 0;
} else if (bzb->bzbFlags & BZB_ROOTFS) {
type = ROOT_PART;
*fstype = FS_BSDFFS;
} else if (bzb->bzbFlags & (BZB_USRFS | BZB_USRFS_NEW)) {
type = UFS_PART;
*fstype = FS_BSDFFS;
} else if (bzb->bzbType == BZB_TYPESWAP) {
type = SWAP_PART;
*fstype = FS_SWAP;
} else {
type = SCRATCH_PART;
*fstype = FS_OTHER;
}
} else if (strcmp(PART_TYPE_MAC, typestr) == 0) {
type = HFS_PART;
*fstype = FS_HFS;
} else if (strcmp(PART_TYPE_APPLEUFS, typestr) == 0) {
type = SCRATCH_PART;
*fstype = FS_APPLEUFS;
} else if (strcmp(PART_TYPE_LINUX, typestr) == 0) {
type = SCRATCH_PART;
*fstype = FS_OTHER;
} else if (strcmp(PART_TYPE_LINUX_SWAP, typestr) == 0) {
type = SCRATCH_PART;
*fstype = FS_OTHER;
} else {
type = SCRATCH_PART; /* no known type */
*fstype = FS_OTHER;
}
return type;
}
static void
setpartition(struct part_map_entry *part, struct partition *pp, int fstype)
{
pp->p_size = part->pmPartBlkCnt;
pp->p_offset = part->pmPyPartStart;
pp->p_fstype = fstype;
part->pmPartType[0] = '\0';
}
static int
getNamedType(part, num_parts, lp, type, alt, maxslot)
struct part_map_entry *part;
int num_parts;
struct disklabel *lp;
int type, alt;
int *maxslot;
{
struct blockzeroblock *bzb;
int i = 0, clust;
u_int8_t realtype;
for (i = 0; i < num_parts; i++) {
if (whichType(part + i, &realtype, &clust) != type)
continue;
if (type == ROOT_PART) {
bzb = (struct blockzeroblock *)
(&(part + i)->pmBootArgs);
if (alt >= 0 && alt != clust)
continue;
setpartition(part + i, &lp->d_partitions[0], realtype);
} else if (type == UFS_PART) {
bzb = (struct blockzeroblock *)
(&(part + i)->pmBootArgs);
if (alt >= 0 && alt != clust)
continue;
setpartition(part + i, &lp->d_partitions[6], realtype);
if (*maxslot < 6)
*maxslot = 6;
} else if (type == SWAP_PART) {
setpartition(part + i, &lp->d_partitions[1], realtype);
if (*maxslot < 1)
*maxslot = 1;
} else if (type == HFS_PART) {
setpartition(part + i, &lp->d_partitions[3], realtype);
if (*maxslot < 3)
*maxslot = 3;
} else
printf("disksubr.c: can't do type %d\n", type);
return 0;
}
return -1;
}
/*
* MF --
* here's what i'm gonna do:
* read in the entire diskpartition table, it may be bigger or smaller
* than NUM_PARTS but read that many entries. Each entry has a magic
* number so we'll know if an entry is crap.
* next fill in the disklabel with info like this
* next fill in the root, usr, and swap parts.
* then look for anything else and fit it in.
* A: root
* B: Swap
* C: Whole disk
* G: Usr
*
*
* I'm not entirely sure what netbsd386 wants in c & d
* 386bsd wants other stuff, so i'll leave them alone
*
* AKB -- I added to Mike's original algorithm by searching for a bzbCluster
* of zero for root, first. This allows A/UX to live on cluster 1 and
* NetBSD to live on cluster 0--regardless of the actual order on the
* disk. This whole algorithm should probably be changed in the future.
*/
static const char *
read_mac_label(dev, strat, lp, osdep)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct part_map_entry *part;
struct partition *pp;
struct buf *bp;
const char *msg = NULL;
int i, slot, maxslot = 0, clust;
u_int8_t realtype;
/* get buffer and initialize it */
bp = geteblk((int)lp->d_secsize * NUM_PARTS);
bp->b_dev = dev;
/* read partition map */
bp->b_blkno = 1; /* partition map starts at blk 1 */
bp->b_bcount = lp->d_secsize * NUM_PARTS;
bp->b_flags |= B_READ;
bp->b_cylinder = 1 / lp->d_secpercyl;
(*strat)(bp);
if (biowait(bp)) {
msg = "Macintosh partition map I/O error";
goto done;
}
part = (struct part_map_entry *)bp->b_data;
/* Fill in standard partitions */
lp->d_npartitions = RAW_PART + 1;
if (getNamedType(part, NUM_PARTS, lp, ROOT_PART, 0, &maxslot))
getNamedType(part, NUM_PARTS, lp, ROOT_PART, -1, &maxslot);
if (getNamedType(part, NUM_PARTS, lp, UFS_PART, 0, &maxslot))
getNamedType(part, NUM_PARTS, lp, UFS_PART, -1, &maxslot);
getNamedType(part, NUM_PARTS, lp, SWAP_PART, -1, &maxslot);
getNamedType(part, NUM_PARTS, lp, HFS_PART, -1, &maxslot);
/* Now get as many of the rest of the partitions as we can */
for (i = 0; i < NUM_PARTS; i++) {
slot = getFreeLabelEntry(lp);
if (slot < 0)
break;
pp = &lp->d_partitions[slot];
/*
* Additional ROOT_PART will turn into a plain old
* UFS_PART partition, live with it.
*/
if (whichType(part + i, &realtype, &clust)) {
setpartition(part + i, pp, realtype);
} else {
slot = 0;
}
if (slot > maxslot)
maxslot = slot;
}
lp->d_npartitions = ((maxslot >= RAW_PART) ? maxslot : RAW_PART) + 1;
done:
brelse(bp, 0);
return msg;
}
/* Read MS-DOS partition table.
*
* XXX -
* Since FFS is endian sensitive, we pay no effort in attempting to
* dig up *BSD/i386 disk labels that may be present on the disk.
* Hence anything but DOS partitions is treated as unknown FS type, but
* this should suffice to mount_msdos Zip and other removable media.
*/
static const char *
read_dos_label(dev, strat, lp, osdep)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct mbr_partition *dp;
struct buf *bp;
const char *msg = NULL;
int i, slot, maxslot = 0;
u_int32_t bsdpartoff;
struct mbr_partition *bsdp;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* read master boot record */
bp->b_blkno = MBR_BBSECTOR;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_READ;
bp->b_cylinder = MBR_BBSECTOR / lp->d_secpercyl;
(*strat)(bp);
bsdpartoff = 0;
/* if successful, wander through dos partition table */
if (biowait(bp)) {
msg = "dos partition I/O error";
goto done;
}
/* XXX */
dp = (struct mbr_partition *)((char *)bp->b_data + MBR_PART_OFFSET);
bsdp = NULL;
for (i = 0; i < MBR_PART_COUNT; i++, dp++) {
switch (dp->mbrp_type) {
case MBR_PTYPE_NETBSD:
bsdp = dp;
break;
case MBR_PTYPE_OPENBSD:
case MBR_PTYPE_386BSD:
if (!bsdp)
bsdp = dp;
break;
}
}
if (!bsdp) {
/* generate fake disklabel */
dp = (struct mbr_partition *)((char *)bp->b_data +
MBR_PART_OFFSET);
for (i = 0; i < MBR_PART_COUNT; i++, dp++) {
if (!dp->mbrp_type)
continue;
slot = getFreeLabelEntry(lp);
if (slot < 0)
break;
if (slot > maxslot)
maxslot = slot;
lp->d_partitions[slot].p_offset = bswap32(dp->mbrp_start);
lp->d_partitions[slot].p_size = bswap32(dp->mbrp_size);
switch (dp->mbrp_type) {
case MBR_PTYPE_FAT12:
case MBR_PTYPE_FAT16S:
case MBR_PTYPE_FAT16B:
case MBR_PTYPE_FAT32:
case MBR_PTYPE_FAT32L:
case MBR_PTYPE_FAT16L:
lp->d_partitions[slot].p_fstype = FS_MSDOS;
break;
default:
lp->d_partitions[slot].p_fstype = FS_OTHER;
break;
}
}
msg = "no NetBSD disk label";
} else {
/* NetBSD partition on MBR */
bsdpartoff = bswap32(bsdp->mbrp_start);
lp->d_partitions[2].p_size = bswap32(bsdp->mbrp_size);
lp->d_partitions[2].p_offset = bswap32(bsdp->mbrp_start);
if (2 > maxslot)
maxslot = 2;
/* read in disklabel, blkno + 1 for DOS disklabel offset */
osdep->cd_labelsector = bsdpartoff + MBR_LABELSECTOR;
osdep->cd_labeloffset = MBR_LABELOFFSET;
if (get_netbsd_label(dev, strat, lp, osdep))
goto done;
msg = "no NetBSD disk label";
}
lp->d_npartitions = ((maxslot >= RAW_PART) ? maxslot : RAW_PART) + 1;
done:
brelse(bp, 0);
return (msg);
}
/*
* Get real NetBSD disk label
*/
static int
get_netbsd_label(dev, strat, lp, osdep)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct buf *bp;
struct disklabel *dlp;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* Now get the label block */
bp->b_blkno = osdep->cd_labelsector;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_READ;
bp->b_cylinder = bp->b_blkno / (lp->d_secsize / DEV_BSIZE) / lp->d_secpercyl;
(*strat)(bp);
if (biowait(bp))
goto done;
for (dlp = (struct disklabel *)((char *)bp->b_data +
osdep->cd_labeloffset);
dlp <= (struct disklabel *)((char *)bp->b_data + lp->d_secsize -
sizeof (*dlp));
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
if (dlp->d_magic == DISKMAGIC
&& dlp->d_magic2 == DISKMAGIC
&& dlp->d_npartitions <= MAXPARTITIONS
&& dkcksum(dlp) == 0) {
*lp = *dlp;
osdep->cd_labeloffset = (char *)dlp -
(char *)bp->b_data;
brelse(bp, 0);
return 1;
}
}
done:
brelse(bp, 0);
return 0;
}
/*
* Attempt to read a disk label from a device using the indicated strategy
* routine. The label must be partly set up before this: secpercyl and
* anything required in the strategy routine (e.g., sector size) must be
* filled in before calling us. Returns null on success and an error
* string on failure.
*
* This will read sector zero. If this contains what looks like a valid
* Macintosh boot sector, we attempt to fill in the disklabel structure.
* If the first longword of the disk is a NetBSD disk label magic number,
* then we assume that it's a real disklabel and return it.
*/
const char *
readdisklabel(dev, strat, lp, osdep)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct buf *bp;
const char *msg = NULL;
if (lp->d_secperunit == 0)
lp->d_secperunit = 0x1fffffff;
if (lp->d_secpercyl == 0) {
return msg = "Zero secpercyl";
}
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
bp->b_blkno = 0;
bp->b_resid = 0;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_READ;
bp->b_cylinder = 1 / lp->d_secpercyl;
(*strat)(bp);
osdep->cd_start = -1;
/* XXX cd_start is abused as a flag for fictious disklabel */
if (biowait(bp)) {
msg = "I/O error reading block zero";
goto done;
}
osdep->cd_labelsector = LABELSECTOR;
osdep->cd_labeloffset = LABELOFFSET;
if (get_netbsd_label(dev, strat, lp, osdep))
osdep->cd_start = 0;
else {
u_int16_t *sbSigp;
sbSigp = (u_int16_t *)bp->b_data;
if (*sbSigp == 0x4552) {
/* it ignores labelsector/offset */
msg = read_mac_label(dev, strat, lp, osdep);
/* the disklabel is fictious */
} else if (bswap16(*(u_int16_t *)((char *)bp->b_data +
MBR_MAGIC_OFFSET)) == MBR_MAGIC) {
/* read_dos_label figures out labelsector/offset */
msg = read_dos_label(dev, strat, lp, osdep);
if (!msg)
osdep->cd_start = 0;
} else {
msg = "no disk label -- NetBSD or Macintosh";
osdep->cd_start = 0; /* XXX for now */
}
}
done:
brelse(bp, 0);
return (msg);
}
/*
* Check new disk label for sensibility before setting it.
*/
int
setdisklabel(olp, nlp, openmask, osdep)
struct disklabel *olp, *nlp;
u_long openmask;
struct cpu_disklabel *osdep;
{
/* sanity clause */
if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0
|| (nlp->d_secsize % DEV_BSIZE) != 0)
return EINVAL;
/* special case to allow disklabel to be invalidated */
if (nlp->d_magic == 0xffffffff) {
*olp = *nlp;
return 0;
}
if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC
|| dkcksum(nlp) != 0)
return EINVAL;
/* openmask parameter ignored */
*olp = *nlp;
return 0;
}
/*
* Write disk label back to device after modification.
*/
int
writedisklabel(dev, strat, lp, osdep)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct buf *bp;
int error;
struct disklabel label;
/*
* Try to re-read a disklabel, in case he changed the MBR.
*/
label = *lp;
readdisklabel(dev, strat, &label, osdep);
if (osdep->cd_start < 0)
return EINVAL;
/* get a buffer and initialize it */
bp = geteblk(lp->d_secsize);
bp->b_dev = dev;
bp->b_blkno = osdep->cd_start + osdep->cd_labelsector;
bp->b_cylinder = bp->b_blkno / (lp->d_secsize / DEV_BSIZE) / lp->d_secpercyl;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_READ;
(*strat)(bp);
error = biowait(bp);
if (error != 0)
goto done;
bp->b_flags &= ~B_READ;
bp->b_flags |= B_WRITE;
bp->b_oflags &= ~BO_DONE;
memcpy((char *)bp->b_data + osdep->cd_labeloffset, (void *)lp,
sizeof *lp);
(*strat)(bp);
error = biowait(bp);
done:
brelse(bp, 0);
return error;
}