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NetBSD/sys/dev/sun/disksubr.c

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/* $NetBSD: disksubr.c,v 1.3 2005/02/04 02:10:47 perry 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.
*/
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
* Copyright (c) 1994 Theo de Raadt
* 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.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.3 2005/02/04 02:10:47 perry Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioccom.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/dkbad.h>
#include <dev/sun/disklabel.h>
#if LABELSECTOR != 0
#error "Default value of LABELSECTOR no longer zero?"
#endif
static char *disklabel_sun_to_bsd(char *, struct disklabel *);
static int disklabel_bsd_to_sun(struct disklabel *, char *);
/*
* 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.
*
* 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, clp)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *clp;
{
struct buf *bp;
struct disklabel *dlp;
struct sun_disklabel *slp;
int error;
/* minimal requirements for archtypal disk label */
if (lp->d_secperunit == 0)
lp->d_secperunit = 0x1fffffff;
if (lp->d_npartitions == 0) {
lp->d_npartitions = RAW_PART + 1;
if (lp->d_partitions[RAW_PART].p_size == 0)
lp->d_partitions[RAW_PART].p_size = 0x1fffffff;
lp->d_partitions[RAW_PART].p_offset = 0;
}
/* obtain buffer to probe drive with */
bp = geteblk((int)lp->d_secsize);
/* next, dig out disk label */
bp->b_dev = dev;
bp->b_blkno = LABELSECTOR;
bp->b_cylinder = 0;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_READ;
(*strat)(bp);
/* if successful, locate disk label within block and validate */
error = biowait(bp);
if (error == 0) {
/* Save the whole block in case it has info we need. */
memcpy(clp->cd_block, bp->b_data, sizeof(clp->cd_block));
}
brelse(bp);
if (error)
return ("disk label read error");
/* Check for a NetBSD disk label at LABELOFFSET */
dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET);
if (dlp->d_magic == DISKMAGIC) {
if (dkcksum(dlp))
return ("NetBSD disk label corrupted");
*lp = *dlp;
return (NULL);
}
/* Check for a Sun disk label (for PROM compatibility). */
slp = (struct sun_disklabel *) clp->cd_block;
if (slp->sl_magic == SUN_DKMAGIC)
return (disklabel_sun_to_bsd(clp->cd_block, lp));
/*
* Check for a NetBSD disk label somewhere in LABELSECTOR
* (compat with others big-endian boxes)
*/
for (dlp = (struct disklabel *)clp->cd_block;
dlp <= (struct disklabel *)((char *)clp->cd_block +
DEV_BSIZE - sizeof(*dlp));
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
continue;
}
if (dlp->d_npartitions > MAXPARTITIONS || dkcksum(dlp) != 0)
return("NetBSD disk label corrupted");
else {
*lp = *dlp;
return(NULL);
}
}
memset(clp->cd_block, 0, sizeof(clp->cd_block));
return ("no disk label");
}
/*
* Check new disk label for sensibility
* before setting it.
*/
int
setdisklabel(olp, nlp, openmask, clp)
struct disklabel *olp, *nlp;
u_long openmask;
struct cpu_disklabel *clp;
{
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);
while ((i = ffs(openmask)) != 0) {
i--;
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);
}
*olp = *nlp;
return (0);
}
/*
* Write disk label back to device after modification.
* Current label is already in clp->cd_block[]
*/
int
writedisklabel(dev, strat, lp, clp)
dev_t dev;
void (*strat)(struct buf *);
struct disklabel *lp;
struct cpu_disklabel *clp;
{
struct buf *bp;
int error;
struct disklabel *dlp;
struct sun_disklabel *slp;
/*
* Embed native label in a piece of wasteland.
*/
if (sizeof(struct disklabel) > sizeof slp->sl_bsdlabel)
return EFBIG;
slp = (struct sun_disklabel *)clp->cd_block;
memset(slp->sl_bsdlabel, 0, sizeof(slp->sl_bsdlabel));
dlp = (struct disklabel *)slp->sl_bsdlabel;
*dlp = *lp;
/* Build a SunOS compatible label around the native label */
error = disklabel_bsd_to_sun(lp, clp->cd_block);
if (error)
return (error);
/* Get a buffer and copy the new label into it. */
bp = geteblk((int)lp->d_secsize);
memcpy(bp->b_data, clp->cd_block, sizeof(clp->cd_block));
/* Write out the updated label. */
bp->b_dev = dev;
bp->b_blkno = LABELSECTOR;
bp->b_cylinder = 0;
bp->b_bcount = lp->d_secsize;
bp->b_flags |= B_WRITE;
(*strat)(bp);
error = biowait(bp);
brelse(bp);
return (error);
}
/*
* Determine the size of the transfer, and make sure it is
* within the boundaries of the partition. Adjust transfer
* if needed, and signal errors or early completion.
*/
int
bounds_check_with_label(dk, bp, wlabel)
struct disk *dk;
struct buf *bp;
int wlabel;
{
struct disklabel *lp = dk->dk_label;
struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
int maxsz = p->p_size;
int sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
/*
* overwriting disk label ?
* The label is always in sector LABELSECTOR.
* XXX should also protect bootstrap in first 8K
*/
if (bp->b_blkno + p->p_offset <= LABELSECTOR &&
(bp->b_flags & B_READ) == 0 && wlabel == 0) {
bp->b_error = EROFS;
goto bad;
}
/* beyond partition? */
if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
/* if exactly at end of disk, return an EOF */
if (bp->b_blkno == maxsz) {
bp->b_resid = bp->b_bcount;
return(0);
}
/* or truncate if part of it fits */
sz = maxsz - bp->b_blkno;
if (sz <= 0) {
bp->b_error = EINVAL;
goto bad;
}
bp->b_bcount = sz << DEV_BSHIFT;
}
/* calculate cylinder for disksort to order transfers with */
bp->b_resid = (bp->b_blkno + p->p_offset) / lp->d_secpercyl;
return(1);
bad:
bp->b_flags |= B_ERROR;
return(-1);
}
/************************************************************************
*
* The rest of this was taken from arch/sparc/scsi/sun_disklabel.c
* and then substantially rewritten by Gordon W. Ross
*
************************************************************************/
/* What partition types to assume for Sun disklabels: */
static u_char
sun_fstypes[8] = {
FS_BSDFFS, /* a */
FS_SWAP, /* b */
FS_OTHER, /* c - whole disk */
FS_BSDFFS, /* d */
FS_BSDFFS, /* e */
FS_BSDFFS, /* f */
FS_BSDFFS, /* g */
FS_BSDFFS, /* h */
};
/*
* Given a SunOS disk label, set lp to a BSD disk label.
* Returns NULL on success, else an error string.
*
* The BSD label is cleared out before this is called.
*/
static char *
disklabel_sun_to_bsd(cp, lp)
char *cp;
struct disklabel *lp;
{
struct sun_disklabel *sl;
struct partition *npp;
struct sun_dkpart *spp;
int i, secpercyl;
u_short cksum, *sp1, *sp2;
sl = (struct sun_disklabel *)cp;
/* Verify the XOR check. */
sp1 = (u_short *)sl;
sp2 = (u_short *)(sl + 1);
cksum = 0;
while (sp1 < sp2)
cksum ^= *sp1++;
if (cksum != 0)
return("SunOS disk label, bad checksum");
/* Format conversion. */
lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname));
lp->d_secsize = 512;
lp->d_nsectors = sl->sl_nsectors;
lp->d_ntracks = sl->sl_ntracks;
lp->d_ncylinders = sl->sl_ncylinders;
secpercyl = sl->sl_nsectors * sl->sl_ntracks;
lp->d_secpercyl = secpercyl;
lp->d_secperunit = secpercyl * sl->sl_ncylinders;
lp->d_sparespercyl = sl->sl_sparespercyl;
lp->d_acylinders = sl->sl_acylinders;
lp->d_rpm = sl->sl_rpm;
lp->d_interleave = sl->sl_interleave;
lp->d_npartitions = 8;
/* These are as defined in <ufs/ffs/fs.h> */
lp->d_bbsize = 8192; /* XXX */
lp->d_sbsize = 8192; /* XXX */
for (i = 0; i < 8; i++) {
spp = &sl->sl_part[i];
npp = &lp->d_partitions[i];
npp->p_offset = spp->sdkp_cyloffset * secpercyl;
npp->p_size = spp->sdkp_nsectors;
if (npp->p_size == 0) {
npp->p_fstype = FS_UNUSED;
} else {
npp->p_fstype = sun_fstypes[i];
if (npp->p_fstype == FS_BSDFFS) {
/*
* The sun label does not store the FFS fields,
* so just set them with default values here.
*/
npp->p_fsize = 1024;
npp->p_frag = 8;
npp->p_cpg = 16;
}
}
}
lp->d_checksum = 0;
lp->d_checksum = dkcksum(lp);
return (NULL);
}
/*
* Given a BSD disk label, update the Sun disklabel
* pointed to by cp with the new info. Note that the
* Sun disklabel may have other info we need to keep.
* Returns zero or error code.
*/
static int
disklabel_bsd_to_sun(lp, cp)
struct disklabel *lp;
char *cp;
{
struct sun_disklabel *sl;
struct partition *npp;
struct sun_dkpart *spp;
int i, secpercyl;
u_short cksum, *sp1, *sp2;
if (lp->d_secsize != 512)
return (EINVAL);
sl = (struct sun_disklabel *)cp;
/*
* Format conversion.
*/
memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname));
sl->sl_rpm = lp->d_rpm;
sl->sl_pcylinders = lp->d_ncylinders + lp->d_acylinders; /* XXX */
sl->sl_sparespercyl = lp->d_sparespercyl;
sl->sl_interleave = lp->d_interleave;
sl->sl_ncylinders = lp->d_ncylinders;
sl->sl_acylinders = lp->d_acylinders;
sl->sl_ntracks = lp->d_ntracks;
sl->sl_nsectors = lp->d_nsectors;
secpercyl = sl->sl_nsectors * sl->sl_ntracks;
for (i = 0; i < 8; i++) {
spp = &sl->sl_part[i];
npp = &lp->d_partitions[i];
/*
* SunOS partitions must start on a cylinder boundary.
* Note this restriction is forced upon NetBSD/sparc
* labels too, since we want to keep both labels
* synchronised.
*/
if (npp->p_offset % secpercyl)
return (EINVAL);
spp->sdkp_cyloffset = npp->p_offset / secpercyl;
spp->sdkp_nsectors = npp->p_size;
}
sl->sl_magic = SUN_DKMAGIC;
/* Compute the XOR check. */
sp1 = (u_short *)sl;
sp2 = (u_short *)(sl + 1);
sl->sl_cksum = cksum = 0;
while (sp1 < sp2)
cksum ^= *sp1++;
sl->sl_cksum = cksum;
return (0);
}
/*
* Search the bad sector table looking for the specified sector.
* Return index if found.
* Return -1 if not found.
*/
int
isbad(bt, cyl, trk, sec)
struct dkbad *bt;
int cyl, trk, sec;
{
int i;
long blk, bblk;
blk = ((long)cyl << 16) + (trk << 8) + sec;
for (i = 0; i < 126; i++) {
bblk = ((long)bt->bt_bad[i].bt_cyl << 16) +
bt->bt_bad[i].bt_trksec;
if (blk == bblk)
return (i);
if (blk < bblk || bblk < 0)
break;
}
return (-1);
}
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