NetBSD-5.0.2/sys/arch/arm/arm/disksubr.c
/* $NetBSD: disksubr.c,v 1.20 2008/01/02 11:48:23 ad Exp $ */
/*
* Copyright (c) 1998 Christopher G. Demetriou. 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 Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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) 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.
*
* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
*/
/*
* Copyright (c) 1995 Mark Brinicombe
* 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
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.20 2008/01/02 11:48:23 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/dkbad.h>
#include <sys/disklabel.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/disk.h>
/*
* 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.
*
* If dos partition table requested, attempt to load it and
* find disklabel inside a DOS partition. Also, if bad block
* table needed, attempt to extract it as well. Return buffer
* for use in signalling errors if requested.
*
* Returns null on success and an error string on failure.
*/
const char *
readdisklabel(dev, strat, lp, osdep)
dev_t dev;
void (*strat) __P((struct buf *));
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct buf *bp;
struct disklabel *dlp;
const char *msg = NULL;
int cyl, netbsdpartoff, i, found = 0;
/* minimal requirements for archtypal disk label */
if (lp->d_secsize == 0)
lp->d_secsize = DEV_BSIZE;
if (lp->d_secperunit == 0)
lp->d_secperunit = 0x1fffffff;
if (lp->d_npartitions < RAW_PART + 1)
lp->d_npartitions = RAW_PART + 1;
if (lp->d_partitions[RAW_PART].p_size == 0) {
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
lp->d_partitions[RAW_PART].p_offset = 0;
lp->d_partitions[RAW_PART].p_size = 0x1fffffff;
}
/* obtain buffer to probe drive with */
bp = geteblk((int)lp->d_secsize);
/* request no partition relocation by driver on I/O operations */
bp->b_dev = dev;
/* do netbsd partitions in the process of getting disklabel? */
netbsdpartoff = 0;
cyl = LABELSECTOR / lp->d_secpercyl;
if (osdep) {
if (filecore_label_read(dev, strat,lp, osdep, &msg, &cyl,
&netbsdpartoff) ||
mbr_label_read(dev, strat, lp, osdep, &msg, &cyl,
&netbsdpartoff)) {
if (msg != NULL)
goto done;
} else {
/*
* We didn't find anything we like; NetBSD native.
* netbsdpartoff and cyl should be unchanged.
*/
KASSERT(netbsdpartoff == 0);
KASSERT(cyl == (LABELSECTOR / lp->d_secpercyl));
}
}
/* next, dig out disk label */
bp->b_blkno = netbsdpartoff + LABELSECTOR;
bp->b_cylinder = bp->b_blkno / lp->d_secpercyl;
bp->b_bcount = lp->d_secsize;
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 done;
}
for (dlp = (struct disklabel *)bp->b_data;
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) {
continue;
} else if (dlp->d_npartitions > MAXPARTITIONS ||
dkcksum(dlp) != 0)
msg = "disk label corrupted";
else {
*lp = *dlp;
msg = NULL;
found = 1;
break;
}
}
if (msg != NULL || found == 0)
goto done;
/* obtain bad sector table if requested and present */
if (osdep && (lp->d_flags & D_BADSECT)) {
struct dkbad *bdp = &osdep->bad;
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 > DEV_BSIZE)
bp->b_blkno *= lp->d_secsize / DEV_BSIZE;
else
bp->b_blkno /= DEV_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(olp, nlp, openmask, osdep)
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);
/* XXX missing check if other acorn/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, strat, lp, osdep)
dev_t dev;
void (*strat) __P((struct buf *));
struct disklabel *lp;
struct cpu_disklabel *osdep;
{
struct buf *bp;
struct disklabel *dlp;
int cyl, netbsdpartoff;
int error = 0, rv;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* do netbsd partitions in the process of getting disklabel? */
netbsdpartoff = 0;
cyl = LABELSECTOR / lp->d_secpercyl;
if (osdep) {
if ((rv = filecore_label_locate(dev, strat,lp, osdep, &cyl,
&netbsdpartoff)) != 0||
(rv = mbr_label_locate(dev, strat, lp, osdep, &cyl,
&netbsdpartoff)) != 0) {
if (rv < 0) {
error = -rv;
goto done;
}
} else {
/*
* We didn't find anything we like; NetBSD native.
* netbsdpartoff and cyl should be unchanged.
*/
KASSERT(netbsdpartoff == 0);
KASSERT(cyl == (LABELSECTOR / lp->d_secpercyl));
}
}
/* writelabel: */
/* printf("writedisklabel: Reading disklabel addr=%08x\n",
netbsdpartoff * DEV_BSIZE);*/
/* next, dig out disk label */
bp->b_blkno = netbsdpartoff + LABELSECTOR;
bp->b_cylinder = cyl;
bp->b_bcount = lp->d_secsize;
bp->b_oflags &= ~(BO_DONE);
bp->b_flags |= B_READ;
(*strat)(bp);
/* if successful, locate disk label within block and validate */
if ((error = biowait(bp)))
goto done;
for (dlp = (struct disklabel *)bp->b_data;
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 &&
dkcksum(dlp) == 0) {
*dlp = *lp;
bp->b_flags &= ~(B_READ);
bp->b_oflags &= ~(BO_DONE);
bp->b_flags |= B_WRITE;
(*strat)(bp);
error = biowait(bp);
goto done;
}
}
error = ESRCH;
done:
brelse(bp, 0);
return (error);
}
/* End of disksubr.c */