NetBSD/sys/arch/sun3/sun3/disksubr.c

/*	$NetBSD: disksubr.c,v 1.18 1997/03/04 22:20:04 gwr Exp $	*/

/*
 * Copyright (c) 1994, 1995 Gordon W. Ross
 * Copyright (c) 1994 Theo de Raadt
 * 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. 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.
 *
 * Credits:
 * This file was based mostly on the i386/disksubr.c file:
 *  	@(#)ufs_disksubr.c	7.16 (Berkeley) 5/4/91
 * The functions: disklabel_sun_to_bsd, disklabel_bsd_to_sun
 * were originally taken from arch/sparc/scsi/sun_disklabel.c
 * (which was written by Theo de Raadt) and then substantially
 * rewritten by Gordon W. Ross.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/dkbad.h>

#include <machine/sun_disklabel.h>

/* XXX encoding of disk minor numbers, should be elsewhere... */
#define dkpart(dev)		(minor(dev) & 7)

#define	b_cylin	b_resid

#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 stategy 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.
 */
char *
readdisklabel(dev, strat, lp, clp)
	dev_t dev;
	void (*strat) __P((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;
	lp->d_npartitions = 1;
	if (lp->d_partitions[0].p_size == 0)
		lp->d_partitions[0].p_size = 0x1fffffff;
	lp->d_partitions[0].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_cylin = 0;
	bp->b_bcount = lp->d_secsize;
	bp->b_flags = B_BUSY | B_READ;
	(*strat)(bp);

	/* if successful, locate disk label within block and validate */
	error = biowait(bp);
	if (!error) {
		/* Save the whole block in case it has info we need. */
		bcopy(bp->b_un.b_addr, clp->cd_block, sizeof(clp->cd_block));
	}
	bp->b_flags = B_INVAL | B_AGE | B_READ;
	brelse(bp);
	if (error)
		return("disk label read error");

	/* 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 (PROM can not boot it). */
	dlp = (struct disklabel *) (clp->cd_block + LABELOFFSET);
	if (dlp->d_magic == DISKMAGIC) {
		if (dkcksum(dlp))
			return("NetBSD disk label corrupted");
		*lp = *dlp; 	/* struct assignment */
		return(NULL);
	}

	bzero(clp->cd_block, 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;
{
	struct partition *opp, *npp;
	int i;

	/* 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 (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);
	}

	/* We did not modify the new label, so the checksum is OK. */
	*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) __P((struct buf *));
	struct disklabel *lp;
	struct cpu_disklabel *clp;
{
	struct buf *bp;
	int error;

	error = disklabel_bsd_to_sun(lp, clp->cd_block);
	if (error)
		return(error);

#if 0	/* XXX - Allow writing NetBSD disk labels? */
	{
		struct disklabel *dlp;
		dlp = (struct disklabel *)(clp->cd_block + LABELOFFSET);
		*dlp = *lp; 	/* struct assignment */
	}
#endif

	/* Get a buffer and copy the new label into it. */
	bp = geteblk((int)lp->d_secsize);
	bcopy(clp->cd_block, bp->b_un.b_addr, sizeof(clp->cd_block));

	/* Write out the updated label. */
	bp->b_dev = dev;
	bp->b_blkno = LABELSECTOR;
	bp->b_cylin = 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(bp, lp, wlabel)
	struct buf *bp;
	struct disklabel *lp;
	int wlabel;
{
	struct partition *p;
	int sz, maxsz;

	p = lp->d_partitions + dkpart(bp->b_dev);
	maxsz = p->p_size;
	sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;

	/* overwriting disk label ? */
	/* XXX should also protect bootstrap in first 8K */
	/* XXX PR#2598: labelsect is always sector zero. */
	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_cylin = (bp->b_blkno + p->p_offset) / lp->d_secpercyl;
	return(1);

bad:
	bp->b_flags |= B_ERROR;
	return(-1);
}

/*
 * This function appears to be called by each disk driver.
 * Aparently this is to give this MD code a chance to do
 * additional "device registration" types of work. (?)
 * For example, the sparc port uses this to record the
 * device node for the PROM-specified boot device.
 */
void
dk_establish(dk, dev)
	struct disk *dk;
	struct device *dev;
{
}

/************************************************************************
 *
 * 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 {
			/* Partition has non-zero size.  Set type, etc. */
			npp->p_fstype = sun_fstypes[i];
			/*
			 * The sun label does not store the FFS fields,
			 * so just set them with default values here.
			 * XXX: This keeps newfs from trying to rewrite
			 * XXX: the disk label in the most common case.
			 * XXX: (Should remove that code from newfs...)
			 */
			if (npp->p_fstype == FS_BSDFFS) {
				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_pcyl = 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];

		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;

	/* Correct 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)
	register struct dkbad *bt;
	int cyl, trk, sec;
{
	register int i;
	register 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);
}