NetBSD-5.0.2/sys/arch/x68k/x68k/disksubr.c
/* $NetBSD: disksubr.c,v 1.33 2008/01/02 11:48:32 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
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.33 2008/01/02 11:48:32 ad Exp $");
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/syslog.h>
#include <sys/disk.h>
/* get rid of DEV_BSIZE dependency */
#define DEF_BSIZE DEV_BSIZE /* default sector size = 512 */
static void parttbl_consistency_check(struct disklabel *,
struct dos_partition *);
/*
* Attempt to read a disk label from a device
* using the indicated strategy routine.
* The label must be partly set up before this:
* secpercyl, secsize and anything required for a block i/o read
* operation in the driver's strategy/start routines
* must be filled in before calling us.
*
* Returns null on success and an error string on failure.
*/
const char *
readdisklabel(dev_t dev, void (*strat)(struct buf *),
struct disklabel *lp, struct cpu_disklabel *osdep)
{
struct dos_partition *dp = 0;
struct dkbad *bdp = &osdep->bad;
struct buf *bp;
struct disklabel *dlp;
const char *msg = NULL;
int i, labelsz;
if (osdep)
dp = osdep->dosparts;
/* minimal requirements for archtypal disk label */
if (lp->d_secsize == 0)
lp->d_secsize = DEF_BSIZE;
if (lp->d_secperunit == 0)
lp->d_secperunit = 0x1fffffff;
if (lp->d_secpercyl == 0)
lp->d_secpercyl = 0x1fffffff;
lp->d_npartitions = RAW_PART + 1;
for (i = 0; i < RAW_PART; i++) {
lp->d_partitions[i].p_size = 0;
lp->d_partitions[i].p_offset = 0;
}
if (lp->d_partitions[0].p_size == 0)
lp->d_partitions[0].p_size = 0x1fffffff;
lp->d_partitions[0].p_offset = 0;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* read BSD disklabel first */
bp->b_blkno = LABELSECTOR;
bp->b_cylinder = LABELSECTOR/lp->d_secpercyl;
labelsz = howmany(LABELOFFSET+sizeof(struct disklabel), lp->d_secsize)
* lp->d_secsize;
bp->b_bcount = labelsz; /* to support < 512B/sector disks */
bp->b_flags |= B_READ;
(*strat)(bp);
/* if successful, locate disk label within block and validate */
if (biowait(bp)) {
msg = "disk label I/O error";
goto dodospart;
}
for (dlp = (struct disklabel *)bp->b_data;
dlp <= (struct disklabel *)
((char *)bp->b_data + labelsz - sizeof(*dlp));
dlp = (struct disklabel *)((uint8_t *)dlp + sizeof(long))) {
if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
if (msg == NULL)
msg = "no disk label";
} else if (dlp->d_npartitions > MAXPARTITIONS ||
dkcksum(dlp) != 0)
msg = "disk label corrupted";
else {
*lp = *dlp;
msg = NULL;
break;
}
}
dodospart:
/* next do the Human68k-style partition table */
/* Human68k does not support > 2048B/sector devices (?) */
if (lp->d_secsize >= 2048) {
if (msg)
goto done;
goto dobadsect;
}
bp->b_blkno = DOSPARTOFF * DEF_BSIZE / lp->d_secsize;
/* DOSPARTOFF in DEV_BSIZE unit */
bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl;
labelsz = howmany(sizeof(struct cpu_disklabel),
lp->d_secsize) * lp->d_secsize;
bp->b_bcount = labelsz; /* to support < 512B/sector disks */
bp->b_oflags &= ~(BO_DONE);
(*strat)(bp);
/* if successful, wander through Human68k partition table */
if (biowait(bp))
goto done;
if (strncmp(bp->b_data, "X68K", 4) != 0) {
/* Human68k-style partition table does not exist */
if (msg)
goto done;
goto dobadsect;
}
/* XXX how do we check veracity/bounds of this? */
if (dp)
memcpy(dp, (char *)bp->b_data + sizeof(*dp) /*DOSPARTOFF*/,
NDOSPART * sizeof(*dp));
else
dp = (void *)((char *)bp->b_data + sizeof(*dp) /*DOSPARTOFF*/);
/* if BSD disklabel does not exist, fall back to Human68k partition */
if (msg != NULL) {
msg = NULL;
lp->d_bbsize = 8192;
lp->d_sbsize = 2048;
for (i = 0; i < NDOSPART; i++, dp++)
/* is this ours? */
if (dp->dp_size) {
u_char fstype;
int part = i + (i < RAW_PART ? 0 : 1);
int start = dp->dp_start * 2;
int size = dp->dp_size * 2;
/* update disklabel with details */
lp->d_partitions[part].p_size = size;
lp->d_partitions[part].p_offset = start;
/* get partition type */
#ifndef COMPAT_10
if (dp->dp_flag == 1)
fstype = FS_UNUSED;
else
#endif
if (!memcmp(dp->dp_typname, "Human68k", 8))
fstype = FS_MSDOS;
else if (!memcmp(dp->dp_typname,
"BSD ffs ", 8))
fstype = FS_BSDFFS;
else if (!memcmp(dp->dp_typname,
"BSD lfs ", 8))
fstype = FS_BSDLFS;
else if (!memcmp(dp->dp_typname,
"BSD swap", 8))
fstype = FS_SWAP;
#ifndef COMPAT_14
else if (part == 1)
fstype = FS_SWAP;
#endif
else
fstype = FS_BSDFFS; /* XXX */
lp->d_partitions[part].p_fstype = fstype; /* XXX */
if (lp->d_npartitions <= part)
lp->d_npartitions = part + 1;
}
} else {
parttbl_consistency_check(lp, dp);
}
dobadsect:
/* obtain bad sector table if requested and present */
if (bdp && (lp->d_flags & D_BADSECT)) {
struct dkbad *db;
i = 0;
do {
/* read a bad sector table */
bp->b_oflags &= ~(BO_DONE);
bp->b_flags |= B_READ;
bp->b_blkno = lp->d_secperunit - lp->d_nsectors + i;
if (lp->d_secsize > DEF_BSIZE)
bp->b_blkno *= lp->d_secsize / DEF_BSIZE;
else
bp->b_blkno /= DEF_BSIZE / lp->d_secsize;
bp->b_bcount = lp->d_secsize;
bp->b_cylinder = lp->d_ncylinders - 1;
(*strat)(bp);
/* if successful, validate, otherwise try another */
if (biowait(bp)) {
msg = "bad sector table I/O error";
} else {
db = (struct dkbad *)(bp->b_data);
#define DKBAD_MAGIC 0x4321
if (db->bt_mbz == 0
&& db->bt_flag == DKBAD_MAGIC) {
msg = NULL;
*bdp = *db;
break;
} else
msg = "bad sector table corrupted";
}
} while (bp->b_error != 0 && (i += 2) < 10 &&
i < lp->d_nsectors);
}
done:
brelse(bp, 0);
return (msg);
}
/*
* Check new disk label for sensibility
* before setting it.
*/
int
setdisklabel(struct disklabel *olp, struct disklabel *nlp, u_long openmask,
struct cpu_disklabel *osdep)
{
int i;
struct partition *opp, *npp;
/* 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);
if (osdep)
parttbl_consistency_check(nlp, osdep->dosparts);
/* XXX missing check if other dos partitions will be overwritten */
while (openmask != 0) {
i = ffs(openmask) - 1;
openmask &= ~(1 << i);
if (nlp->d_npartitions <= i)
return (EBUSY);
opp = &olp->d_partitions[i];
npp = &nlp->d_partitions[i];
if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
return (EBUSY);
/*
* Copy internally-set partition information
* if new label doesn't include it. XXX
*/
if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
npp->p_fstype = opp->p_fstype;
npp->p_fsize = opp->p_fsize;
npp->p_frag = opp->p_frag;
npp->p_cpg = opp->p_cpg;
}
}
nlp->d_checksum = 0;
nlp->d_checksum = dkcksum(nlp);
*olp = *nlp;
return (0);
}
/*
* Write disk label back to device after modification.
*/
int
writedisklabel(dev_t dev, void (*strat)(struct buf *),
struct disklabel *lp, struct cpu_disklabel *osdep)
{
struct dos_partition *dp = 0;
struct buf *bp;
struct disklabel *dlp;
int error, labelsz, i;
const char *np;
if (osdep)
dp = osdep->dosparts;
/* sanity clause */
if (lp->d_secpercyl == 0 || lp->d_secsize == 0
/*|| (lp->d_secsize % DEF_BSIZE) != 0*/)
return(EINVAL);
if (dp)
parttbl_consistency_check(lp, dp);
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* attempt to write BSD disklabel first */
bp->b_blkno = LABELSECTOR;
bp->b_cylinder = LABELSECTOR / lp->d_secpercyl;
labelsz = howmany(LABELOFFSET+sizeof(struct disklabel), lp->d_secsize)
* lp->d_secsize;
bp->b_bcount = labelsz; /* to support < 512B/sector disks */
bp->b_flags |= B_READ;
(*strat)(bp);
/* if successful, locate disk label within block and validate */
if (biowait(bp))
goto dodospart;
error = ESRCH;
for (dlp = (struct disklabel *)bp->b_data;
dlp <= (struct disklabel *)
((char *)bp->b_data + labelsz - sizeof(*dlp));
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
dkcksum(dlp) == 0) {
*dlp = *lp;
bp->b_oflags &= ~(BO_DONE);
bp->b_flags &= ~(B_READ);
bp->b_flags |= B_WRITE;
(*strat)(bp);
error = biowait(bp);
break;
}
}
/* do dos partitions in the process of getting disklabel? */
if (error) {
dodospart:
if (lp->d_secsize >= 2048) {
error = ESRCH;
goto done;
}
#if 0 /* there is no mark on floppies */
/* read the x68k disk magic */
bp->b_blkno = DOSBBSECTOR;
bp->b_bcount = lp->d_secsize;
bp->b_oflags &= ~(BO_DONE);
bp->b_flags |= B_READ;
bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl;
(*strat)(bp);
if ((error = biowait(bp)) || memcmp(bp->b_data, "X68SCSI1", 8))
printf("warning: disk not marked for x68k");
#endif
/* read the partition table */
bp->b_blkno = DOSPARTOFF;
labelsz = howmany(sizeof(struct cpu_disklabel),
lp->d_secsize) * lp->d_secsize;
bp->b_bcount = labelsz;
bp->b_oflags &= ~(BO_DONE);
bp->b_flags |= B_READ;
bp->b_cylinder = DOSPARTOFF / lp->d_secpercyl;
(*strat)(bp);
if ((error = biowait(bp)) == 0) {
/* XXX how do we check veracity/bounds of this? */
dp = (struct dos_partition *)bp->b_data + 1;
for (i = 0; i < NDOSPART; i++, dp++) {
int part = i + (i < RAW_PART ? 0 : 1);
int start, size;
start = lp->d_partitions[part].p_offset >> 1;
size = lp->d_partitions[part].p_size >> 1;
switch (lp->d_partitions[part].p_fstype) {
case FS_MSDOS:
np = "Human68k";
dp->dp_flag = 0; /* autoboot */
break;
case FS_SWAP:
np = "BSD swap";
dp->dp_flag = 2; /* in use */
break;
case FS_BSDFFS:
np = "BSD ffs ";
if (part == 0)
dp->dp_flag = 0; /* autoboot */
else
dp->dp_flag = 2; /* in use */
break;
case FS_BSDLFS:
np = "BSD lfs ";
if (part == 0)
dp->dp_flag = 0; /* autoboot */
else
dp->dp_flag = 2; /* in use */
break;
case FS_UNUSED:
np = "\0\0\0\0\0\0\0\0";
start = size = 0;
if (part < lp->d_npartitions) {
dp->dp_flag = 1;
} else {
dp->dp_flag = 0;
}
break;
default:
/* XXX OS-9, MINIX etc. */
continue;
}
memcpy(dp->dp_typname, np, 8);
dp->dp_start = start;
dp->dp_size = size;
}
bp->b_oflags &= ~(BO_DONE);
bp->b_flags &= ~(B_READ);
bp->b_flags |= B_WRITE;
(*strat)(bp);
error = biowait(bp);
}
}
#ifdef maybe
/* disklabel in appropriate location? */
if (lp->d_partitions[0].p_offset != 0
&& lp->d_partitions[0].p_offset != dospartoff) {
error = EXDEV;
goto done;
}
#endif
done:
brelse(bp, 0);
return (error);
}
static void
parttbl_consistency_check(struct disklabel *lp, struct dos_partition *dp)
{
int i, j;
int f = (lp->d_secsize >= 1024) ? lp->d_secsize/1024 : 1;
int g = (lp->d_secsize >= 1024) ? 1 : 1024/lp->d_secsize;
/* 1. overlapping check on partition table */
for (i = 0; i < NDOSPART; i++) {
if (dp[i].dp_size == 0)
continue;
for (j = i+1; j < NDOSPART; j++) {
if (dp[j].dp_size == 0)
continue;
if (((dp[i].dp_start <= dp[j].dp_start) &&
(dp[i].dp_start + dp[i].dp_size > dp[j].dp_start))||
((dp[j].dp_start <= dp[i].dp_start) &&
(dp[j].dp_start + dp[j].dp_size > dp[i].dp_start))) {
printf("warning: Human68k partition %d and %d"
" are overlapping\n", i+1, j+1);
return;
}
}
}
/* 2. scan disklabel partitions */
#define bp lp->d_partitions
for (i = 0; i < lp->d_npartitions; i++) {
int c = 0;
if (lp->d_partitions[i].p_fstype == FS_UNUSED ||
lp->d_partitions[i].p_size == 0)
continue;
for (j = 0; j < NDOSPART; j++) {
if (dp[j].dp_size == 0)
continue;
if ((bp[i].p_offset * f < (dp[j].dp_start + dp[j].dp_size) * g) &&
((bp[i].p_offset + bp[i].p_size) * f >= (dp[j].dp_start + dp[j].dp_size) * g))
c++;
if ((bp[i].p_offset * f > dp[j].dp_start * g) &&
((bp[i].p_offset + bp[i].p_size) * f < (dp[j].dp_start + dp[j].dp_size) * g))
c++;
if ((bp[i].p_offset * f >= dp[j].dp_start * g) &&
((bp[i].p_offset + bp[i].p_size) * f < dp[j].dp_start * g))
c++;
}
if (c > 1)
printf ("warning: partition %c spans for 2 or more"
" partitions in Human68k partition table.\n",
i+'a');
}
#undef bp
/* more checks? */
}