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/* $OpenBSD: disksubr.c,v 1.66 2010/02/26 23:11:57 deraadt Exp $ */
/*
* Copyright (c) 1998 Steve Murphree, Jr.
* Copyright (c) 1995 Dale Rahn.
* 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. 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
void bsdtocpulabel(struct disklabel *, struct mvmedisklabel *);
int cputobsdlabel(struct disklabel *, struct mvmedisklabel *);
/*
* 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.
*/
int
readdisklabel(dev_t dev, void (*strat)(struct buf *),
struct disklabel *lp, int spoofonly)
{
struct buf *bp = NULL;
int error;
if ((error = initdisklabel(lp)))
goto done;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
/* don't read the on-disk label if we are in spoofed-only mode */
if (spoofonly)
goto done;
bp->b_blkno = LABELSECTOR;
bp->b_bcount = lp->d_secsize;
bp->b_flags = B_BUSY | B_READ | B_RAW;
(*strat)(bp);
if (biowait(bp)) {
error = bp->b_error;
goto done;
}
error = cputobsdlabel(lp, (struct mvmedisklabel *)bp->b_data);
if (error == 0)
goto done;
#if defined(CD9660)
error = iso_disklabelspoof(dev, strat, lp);
if (error == 0)
goto done;
#endif
#if defined(UDF)
error = udf_disklabelspoof(dev, strat, lp);
if (error == 0)
goto done;
#endif
done:
if (bp) {
bp->b_flags |= B_INVAL;
brelse(bp);
}
return (error);
}
/*
* Write disk label back to device after modification.
*/
int
writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
{
struct buf *bp = NULL;
int error;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
bp->b_blkno = LABELSECTOR;
bp->b_bcount = lp->d_secsize;
bp->b_flags = B_BUSY | B_READ | B_RAW;
(*strat)(bp);
if ((error = biowait(bp)) != 0)
goto done;
bsdtocpulabel(lp, (struct mvmedisklabel *)bp->b_data);
bp->b_flags = B_BUSY | B_WRITE | B_RAW;
(*strat)(bp);
error = biowait(bp);
done:
if (bp) {
bp->b_flags |= B_INVAL;
brelse(bp);
}
return (error);
}
void
bsdtocpulabel(struct disklabel *lp, struct mvmedisklabel *clp)
{
char *tmot = "MOTOROLA", *id = "M68K", *mot;
int i;
bzero(clp, sizeof(*clp));
clp->magic1 = lp->d_magic;
clp->type = lp->d_type;
clp->subtype = lp->d_subtype;
strncpy(clp->vid_vd, lp->d_typename, 16);
strncpy(clp->packname, lp->d_packname, 16);
clp->cfg_psm = lp->d_secsize;
clp->cfg_spt = lp->d_nsectors;
clp->cfg_trk = lp->d_ncylinders; /* trk is really num of cyl! */
clp->cfg_hds = lp->d_ntracks;
clp->secpercyl = lp->d_secpercyl;
clp->secperunit = DL_GETDSIZE(lp);
clp->sparespertrack = lp->d_sparespertrack;
clp->sparespercyl = lp->d_sparespercyl;
clp->acylinders = lp->d_acylinders;
clp->rpm = lp->d_rpm;
clp->cfg_ilv = lp->d_interleave;
clp->cfg_sof = 1;
clp->cylskew = 1;
clp->headswitch = 0;
clp->cfg_ssr = 0;
clp->flags = lp->d_flags;
for (i = 0; i < NDDATA; i++)
clp->drivedata[i] = lp->d_drivedata[i];
for (i = 0; i < NSPARE; i++)
clp->spare[i] = lp->d_spare[i];
clp->magic2 = lp->d_magic2;
clp->checksum = lp->d_checksum;
clp->partitions = lp->d_npartitions;
clp->bbsize = lp->d_bbsize;
clp->sbsize = lp->d_sbsize;
clp->checksum = lp->d_checksum;
bcopy(&lp->d_partitions[0], clp->vid_4, sizeof(struct partition) * 4);
bcopy(&lp->d_partitions[4], clp->cfg_4, sizeof(struct partition) * 12);
clp->version = 2;
/* Put "MOTOROLA" in the VID. This makes it a valid boot disk. */
for (mot = clp->vid_mot, i = 0; i < 8; i++)
*mot++ = *tmot++;
/* put volume id in the VID */
for (mot = clp->vid_id, i = 0; i < 4; i++)
*mot++ = *id++;
}
int
cputobsdlabel(struct disklabel *lp, struct mvmedisklabel *clp)
{
int i;
if (clp->magic1 != DISKMAGIC || clp->magic2 != DISKMAGIC)
return (EINVAL); /* no disk label */
lp->d_magic = clp->magic1;
lp->d_type = clp->type;
lp->d_subtype = clp->subtype;
strncpy(lp->d_typename, clp->vid_vd, sizeof lp->d_typename);
strncpy(lp->d_packname, clp->packname, sizeof lp->d_packname);
lp->d_secsize = clp->cfg_psm;
lp->d_nsectors = clp->cfg_spt;
lp->d_ncylinders = clp->cfg_trk; /* trk is really num of cyl! */
lp->d_ntracks = clp->cfg_hds;
lp->d_secpercyl = clp->secpercyl;
if (DL_GETDSIZE(lp) == 0)
DL_SETDSIZE(lp, clp->secperunit);
lp->d_sparespertrack = clp->sparespertrack;
lp->d_sparespercyl = clp->sparespercyl;
lp->d_acylinders = clp->acylinders;
lp->d_rpm = clp->rpm;
lp->d_interleave = clp->cfg_ilv;
lp->d_flags = clp->flags;
for (i = 0; i < NDDATA; i++)
lp->d_drivedata[i] = clp->drivedata[i];
for (i = 0; i < NSPARE; i++)
lp->d_spare[i] = clp->spare[i];
lp->d_magic2 = clp->magic2;
lp->d_npartitions = clp->partitions;
lp->d_bbsize = clp->bbsize;
lp->d_sbsize = clp->sbsize;
bcopy(clp->vid_4, &lp->d_partitions[0], sizeof(struct partition) * 4);
bcopy(clp->cfg_4, &lp->d_partitions[4], sizeof(struct partition) * 12);
if (clp->version < 2) {
struct __partitionv0 *v0pp = (struct __partitionv0 *)lp->d_partitions;
struct partition *pp = lp->d_partitions;
for (i = 0; i < lp->d_npartitions; i++, pp++, v0pp++) {
pp->p_fragblock = DISKLABELV1_FFS_FRAGBLOCK(v0pp->
p_fsize, v0pp->p_frag);
pp->p_offseth = 0;
pp->p_sizeh = 0;
}
}
lp->d_version = 1;
lp->d_checksum = 0;
lp->d_checksum = dkcksum(lp);
return (0);
}
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