reuse niklas@'s disksubr.c, enhance for LIF handling

1 files changed, 885 insertions, 0 deletions

diff --git a/sys/arch/hppa/hppa/disksubr.c b/sys/arch/hppa/hppa/disksubr.c
new file mode 100644
index 00000000000..9bfed643f09
--- /dev/null
+++ b/sys/arch/hppa/hppa/disksubr.c
@@ -0,0 +1,885 @@
+/*	$OpenBSD: disksubr.c,v 1.1 1999/05/12 14:53:08 mickey Exp $	*/
+
+/*
+ * Copyright (c) 1999 Michael Shalayeff
+ * Copyright (c) 1997 Niklas Hallqvist
+ * Copyright (c) 1996 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.
+ *
+ *	@(#)ufs_disksubr.c	7.16 (Berkeley) 5/4/91
+ */
+
+/*
+ * This disksubr.c module started to take it's present form on OpenBSD/alpha
+ * but it was always thought it should be made completely MI and not need to
+ * be in that alpha-specific tree at all.
+ *
+ * XXX The DOS partitioning code is not endian-independent, only native
+ * endian DOS partition tables can be parsed yet.
+ *
+ * XXX Amiga RDB partitioning is not understood yet.
+ *
+ * XXX HPUX disklabel is not understood yet.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/buf.h>
+#include <sys/device.h>
+#include <sys/disklabel.h>
+#include <sys/syslog.h>
+#include <sys/disk.h>
+
+/* The native defaults... */
+#if defined(alpha) && !defined(DISKLABEL_ALPHA)
+#define DISKLABEL_ALPHA
+#elif (defined(i386) || defined(arc)) && !defined(DISKLABEL_I386)
+#define DISKLABEL_I386
+#elif defined(amiga) && !defined(DISKLABEL_AMIGA)
+#define DISKLABEL_AMIGA
+#elif defined(hppa) && !defined(DISKLABEL_HPPA)
+#define DISKLABEL_HPPA
+#endif
+
+#define	b_cylin	b_resid
+
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALPHA) || defined(DISKLABEL_AMIGA) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+void	swapdisklabel __P((struct disklabel *d));
+char   *readbsdlabel __P((struct buf *, void (*) __P((struct buf *)), int, int,
+    int, int, struct disklabel *, int));
+#endif
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL)
+char   *readdoslabel __P((struct buf *, void (*) __P((struct buf *)),
+    struct disklabel *, struct cpu_disklabel *, int *, int *, int));
+#endif
+#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL)
+char   *readamigalabel __P((struct buf *, void (*) __P((struct buf *)),
+    struct disklabel *, struct cpu_disklabel *, int));
+#endif
+#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+char   *readliflabel __P((struct buf *, void (*) __P((struct buf *)),
+    struct disklabel *, struct cpu_disklabel *, int *, int *, int));
+#endif
+
+static enum disklabel_tag probe_order[] = { LABELPROBES, -1 };
+
+void
+dk_establish(dk, dev)
+	struct disk *dk;
+	struct device *dev;
+{
+}
+
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALPHA) || defined(DISKLABEL_AMIGA) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+
+/*
+ * Byteswap all the fields that might be swapped.
+ */
+void
+swapdisklabel(dlp)
+	struct disklabel *dlp;
+{
+	int i;
+	struct partition *pp;
+
+	swap32(dlp->d_magic);
+	swap16(dlp->d_type);
+	swap16(dlp->d_subtype);
+	swap32(dlp->d_secsize);
+	swap32(dlp->d_nsectors);
+	swap32(dlp->d_ntracks);
+	swap32(dlp->d_ncylinders);
+	swap32(dlp->d_secpercyl);
+	swap32(dlp->d_secperunit);
+	swap16(dlp->d_sparespertrack);
+	swap16(dlp->d_sparespercyl);
+	swap32(dlp->d_acylinders);
+	swap16(dlp->d_rpm);
+	swap16(dlp->d_interleave);
+	swap16(dlp->d_trackskew);
+	swap16(dlp->d_cylskew);
+	swap32(dlp->d_headswitch);
+	swap32(dlp->d_trkseek);
+	swap32(dlp->d_flags);
+	for (i = 0; i < NDDATA; i++)
+		swap32(dlp->d_drivedata[i]);
+	for (i = 0; i < NSPARE; i++)
+		swap32(dlp->d_spare[i]);
+	swap32(dlp->d_magic2);
+	swap16(dlp->d_checksum);
+	swap16(dlp->d_npartitions);
+	swap32(dlp->d_bbsize);
+	swap32(dlp->d_sbsize);
+	for (i = 0; i < MAXPARTITIONS; i++) {
+		pp = &dlp->d_partitions[i];
+		swap32(pp->p_size);
+		swap32(pp->p_offset);
+		swap32(pp->p_fsize);
+		swap16(pp->p_cpg);
+	}
+}
+
+/*
+ * Try to read a standard BSD disklabel at a certain sector.
+ */
+char *
+readbsdlabel(bp, strat, cyl, sec, off, endian, lp, spoofonly)
+	struct buf *bp;
+	void (*strat) __P((struct buf *));
+	int cyl, sec, off, endian;
+	struct disklabel *lp;
+	int spoofonly;
+{
+	struct disklabel *dlp;
+	char *msg = NULL;
+	u_int16_t cksum;
+	u_int32_t magic;
+
+	if (endian != LITTLE_ENDIAN && endian != BIG_ENDIAN)
+		panic("readbsdlabel: unsupported byteorder %d", endian);
+
+	/* don't read the on-disk label if we are in spoofed-only mode */
+	if (spoofonly)
+		return (NULL);
+
+	bp->b_blkno = sec;
+	bp->b_cylin = cyl;
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags = B_BUSY | B_READ;
+	(*strat)(bp);
+
+	/* if successful, locate disk label within block and validate */
+	if (biowait(bp)) {
+		/* XXX we return the faked label built so far */
+		msg = "disk label I/O error";
+		return (msg);
+	}
+
+	magic = endian == BIG_ENDIAN ? htobe32(DISKMAGIC) : htole32(DISKMAGIC);
+
+	/*
+	 * If off is negative, search until the end of the sector for
+	 * the label, otherwise, just look at the specific location
+	 * we're given.
+	 */
+	dlp = (struct disklabel *)(bp->b_data + (off >= 0 ? off : 0));
+	do {
+		if (dlp->d_magic != magic || dlp->d_magic2 != magic) {
+			if (msg == NULL)
+				msg = "no disk label";
+		} else {
+			cksum = dkcksum(dlp);
+			if (endian != BYTE_ORDER)
+				swapdisklabel(dlp);
+			if (dlp->d_npartitions > MAXPARTITIONS || cksum != 0) {
+				msg = "disk label corrupted";
+				/* swap back if necessary.  */
+				if (off < 0 && endian != BYTE_ORDER)
+					swapdisklabel(dlp);
+			} else {
+				*lp = *dlp;
+				/* Recalc magic on foreign labels */
+				if (endian != BYTE_ORDER) {
+					lp->d_checksum = 0;
+					lp->d_checksum = dkcksum(lp);
+				}
+				msg = NULL;
+				break;
+			}
+		}
+		if (off >= 0)
+			break;
+		dlp = (struct disklabel *)((char *)dlp + sizeof(int32_t));
+	} while (dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize -
+	    sizeof(*dlp)));
+	return (msg);
+}
+#endif
+
+/*
+ * 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.
+ *
+ * Returns null on success and an error string on failure.
+ */
+char *
+readdisklabel(dev, strat, lp, osdep, spoofonly)
+	dev_t dev;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int spoofonly;
+{
+	struct buf *bp;
+	char *msg = "no disk label";
+	enum disklabel_tag *tp;
+	int i;
+	struct disklabel minilabel, fallbacklabel;
+
+	/* 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_secpercyl == 0) {
+		msg = "invalid geometry";
+		goto done;
+	}
+	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[i].p_size == 0)
+		lp->d_partitions[i].p_size = 0x1fffffff;
+	lp->d_partitions[i].p_offset = 0;
+	minilabel = fallbacklabel = *lp;
+
+	/* get a buffer and initialize it */
+	bp = geteblk((int)lp->d_secsize);
+	bp->b_dev = dev;
+
+	for (tp = probe_order; msg && *tp != -1; tp++) {
+		switch (*tp) {
+		case DLT_ALPHA:
+#if defined(DISKLABEL_ALPHA) || defined(DISKLABEL_ALL)
+			msg = readbsdlabel(bp, strat, 0, ALPHA_LABELSECTOR,
+			    ALPHA_LABELOFFSET, LITTLE_ENDIAN, lp, spoofonly);
+#endif
+			break;
+
+		case DLT_I386:
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL)
+			msg = readdoslabel(bp, strat, lp, osdep, 0, 0, spoofonly);
+			if (msg)
+				/* Fallback alternative */
+				fallbacklabel = *lp;
+#endif
+			break;
+
+		case DLT_AMIGA:
+#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL)
+			msg = readamigalabel(bp, strat, lp, osdep, spoofonly);
+#endif
+			break;
+
+		case DLT_HPPA:
+#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+			msg = readliflabel(bp, strat, lp, osdep, 0, 0, spoofonly);
+#endif
+			break;
+
+		default:
+			panic("unrecognized disklabel tag %d", *tp);
+		}
+		if (msg)
+			*lp = minilabel;
+	}
+
+	/* Record metainformation about the disklabel.  */
+	if (msg == NULL) {
+		osdep->labelsector = bp->b_blkno;
+		osdep->labeltag = *tp;
+	}
+
+#if defined(CD9660)
+	if (msg && iso_disklabelspoof(dev, strat, lp) == 0)
+		msg = NULL;
+#endif
+
+	/* If there was an error, still provide a decent fake one.  */
+	if (msg)
+		*lp = fallbacklabel;
+
+done:
+	bp->b_flags |= B_INVAL;
+	brelse(bp);
+	return (msg);
+}
+
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL)
+/*
+ * 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.
+ *
+ * We would like to check if each MBR has a valid BOOT_MAGIC, but
+ * we cannot because it doesn't always exist. So.. we assume the
+ * MBR is valid.
+ */
+char *
+readdoslabel(bp, strat, lp, osdep, partoffp, cylp, spoofonly)
+	struct buf *bp;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int *partoffp;
+	int *cylp;
+	int spoofonly;
+{
+	struct dos_partition *dp = osdep->u._i386.dosparts, *dp2;
+	struct dkbad *db, *bdp = &DKBAD(osdep);
+	char *msg = NULL, *cp;
+	int dospartoff, cyl, i, ourpart = -1;
+	dev_t dev;
+
+	if (lp->d_secpercyl == 0) {
+		msg = "invalid label, d_secpercyl == 0";
+		return (msg);
+	}
+	if (lp->d_secsize == 0) {
+		msg = "invalid label, d_secsize == 0";
+		return (msg);
+	}
+
+	/* do dos partitions in the process of getting disklabel? */
+	dospartoff = 0;
+	cyl = I386_LABELSECTOR / lp->d_secpercyl;
+	if (dp) {
+	        daddr_t part_blkno = DOSBBSECTOR;
+		unsigned long extoff = 0;
+		int wander = 1, n = 0, loop = 0;
+
+		/*
+		 * Read dos partition table, follow extended partitions.
+		 * Map the partitions to disklabel entries i-p
+		 */
+		while (wander && n < 8 && loop < 8) {
+		        loop++;
+			wander = 0;
+
+			/* read boot record */
+			bp->b_blkno = part_blkno;
+			bp->b_bcount = lp->d_secsize;
+			bp->b_flags = B_BUSY | B_READ;
+			bp->b_cylin = part_blkno / lp->d_secpercyl;
+			(*strat)(bp);
+		     
+			/* if successful, wander through dos partition table */
+			if (biowait(bp)) {
+				msg = "dos partition I/O error";
+				if (partoffp)
+					*partoffp = -1;
+				return (msg);
+			}
+			bcopy(bp->b_data + DOSPARTOFF, dp,
+			    NDOSPART * sizeof(*dp));
+
+			if (ourpart == -1) {
+				/* Search for our MBR partition */
+				for (dp2=dp, i=0;
+				    i < NDOSPART && ourpart == -1; i++, dp2++)
+					if (dp2->dp_size &&
+					    dp2->dp_typ == DOSPTYP_OPENBSD)
+						ourpart = i;
+				for (dp2=dp, i=0;
+				    i < NDOSPART && ourpart == -1; i++, dp2++)
+					if (dp2->dp_size &&
+					    dp2->dp_typ == DOSPTYP_FREEBSD)
+						ourpart = i;
+				for (dp2=dp, i=0;
+				    i < NDOSPART && ourpart == -1; i++, dp2++)
+					if (dp2->dp_size &&
+					    dp2->dp_typ == DOSPTYP_NETBSD)
+						ourpart = i;
+				if (ourpart == -1)
+					goto donot;
+				/*
+				 * This is our MBR partition. need sector
+				 * address for SCSI/IDE, cylinder for
+				 * ESDI/ST506/RLL
+				 */
+				dp2 = &dp[ourpart];
+				dospartoff = dp2->dp_start + part_blkno;
+				cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect);
+
+				/* XXX build a temporary disklabel */
+				lp->d_partitions[0].p_size = dp2->dp_size;
+				lp->d_partitions[0].p_offset = dp2->dp_start +
+				    part_blkno;
+				if (lp->d_ntracks == 0)
+					lp->d_ntracks = dp2->dp_ehd + 1;
+				if (lp->d_nsectors == 0)
+					lp->d_nsectors = DPSECT(dp2->dp_esect);
+				if (lp->d_secpercyl == 0)
+					lp->d_secpercyl = lp->d_ntracks *
+					    lp->d_nsectors;
+			}
+donot:
+			/*
+			 * In case the disklabel read below fails, we want to
+			 * provide a fake label in i-p.
+			 */
+			for (dp2=dp, i=0; i < NDOSPART && n < 8; i++, dp2++) {
+				struct partition *pp = &lp->d_partitions[8+n];
+
+				if (dp2->dp_typ == DOSPTYP_OPENBSD)
+					continue;
+				if (dp2->dp_size)
+					pp->p_size = dp2->dp_size;
+				if (dp2->dp_start)
+					pp->p_offset =
+					    dp2->dp_start + part_blkno;
+
+				switch (dp2->dp_typ) {
+				case DOSPTYP_UNUSED:
+					for (cp = (char *)dp2;
+					    cp < (char *)(dp2 + 1); cp++)
+						if (*cp)
+							break;
+					/*
+					 * Was it all zeroes?  If so, it is
+					 * an unused entry that we don't
+					 * want to show.
+					 */
+					if (cp == (char *)(dp2 + 1))
+					    continue;
+					lp->d_partitions[8 + n++].p_fstype =
+					    FS_UNUSED;
+					break;
+
+				case DOSPTYP_LINUX:
+					pp->p_fstype = FS_EXT2FS;
+					n++;
+					break;
+
+				case DOSPTYP_FAT12:
+				case DOSPTYP_FAT16S:
+				case DOSPTYP_FAT16B:
+				case DOSPTYP_FAT32:
+				case DOSPTYP_FAT32L:
+				case DOSPTYP_FAT16L:
+					pp->p_fstype = FS_MSDOS;
+					n++;
+					break;
+				case DOSPTYP_EXTEND:
+					part_blkno = dp2->dp_start + extoff;
+					if (!extoff)
+						extoff = dp2->dp_start;
+					wander = 1;
+					break;
+				default:
+					pp->p_fstype = FS_OTHER;
+					n++;
+					break;
+				}
+			}
+		}
+		lp->d_bbsize = 8192;
+		lp->d_sbsize = 64*1024;		/* XXX ? */
+		lp->d_npartitions = n > 0 ? n + 8 : 3;
+	}
+
+	/* record the OpenBSD partition's placement for the caller */
+	if (partoffp)
+		*partoffp = dospartoff;
+	if (cylp)
+		*cylp = cyl;
+
+	/* next, dig out disk label */
+	msg = readbsdlabel(bp, strat, cyl, dospartoff + I386_LABELSECTOR, -1,
+	    LITTLE_ENDIAN, lp, spoofonly);
+	if (msg)
+		return (msg);
+
+	/* obtain bad sector table if requested and present */
+	if (bdp && (lp->d_flags & D_BADSECT)) {
+		/*
+		 * get a new buffer and initialize it as callers trust the
+		 * buffer given to us, to point at the disklabel sector.
+		 */
+		dev = bp->b_dev;
+		bp = geteblk((int)lp->d_secsize);
+		bp->b_dev = dev;
+
+		i = 0;
+		do {
+			/* read a bad sector table */
+			bp->b_flags = B_BUSY | 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_cylin = 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_flags & B_ERROR) && (i += 2) < 10 &&
+		    i < lp->d_nsectors);
+
+		/* Give back the bad block buffer.  */
+		bp->b_flags |= B_INVAL;
+		brelse(bp);
+	}
+	return (msg);
+}
+#endif
+
+#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL)
+/*
+ * XXX RDB parsing is missing still.
+ */
+char *
+readamigalabel(bp, strat, lp, osdep, spoofonly)
+	struct buf *bp;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int spoofonly;
+{
+	char *msg;
+
+	msg = readbsdlabel(bp, strat, 0, AMIGA_LABELSECTOR, AMIGA_LABELOFFSET,
+	    BIG_ENDIAN, lp, spoofonly);
+	return (msg);
+}
+#endif
+
+#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+char *
+readliflabel (bp, strat, lp, osdep, partoffp, cylp, spoofonly)
+	struct buf *bp;
+	void (*strat) __P((struct buf *));
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int *partoffp;
+	int *cylp;
+	int spoofonly;
+{
+	struct lifdir *p;
+	int fsoff;
+
+	/* read LIF volume header */
+	bp->b_blkno = btodb(LIF_VOLSTART);
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags = B_BUSY | B_READ;
+	bp->b_cylin = btodb(LIF_VOLSTART) / lp->d_secpercyl;
+	(*strat)(bp);
+     
+	if (biowait(bp)) {
+		if (partoffp)
+			*partoffp = -1;
+		return "LIF volume header I/O error";
+	}
+
+	bcopy (bp->b_data, &osdep->u._hppa.lifvol, sizeof(struct lifvol));
+	if (osdep->u._hppa.lifvol.vol_id != LIF_VOL_ID) {
+		if (partoffp)
+			*partoffp = -1;
+		return "no LIF volume found";
+	}
+
+	/* read LIF directory */
+	bp->b_blkno = btodb(LIF_DIRSTART);
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags = B_BUSY | B_READ;
+	bp->b_cylin = (LIF_DIRSTART) / lp->d_secpercyl;
+	(*strat)(bp);
+
+	if (biowait(bp)) {
+		if (partoffp)
+			*partoffp = -1;
+		return "LIF directory I/O error";
+	}
+
+	bcopy(bp->b_data, osdep->u._hppa.lifdir, LIF_DIRSIZE);
+	/* scan for LIF_DIR_FS dir entry */
+	for (fsoff = -1,  p = &osdep->u._hppa.lifdir[0];
+	     fsoff < 0 && p < &osdep->u._hppa.lifdir[LIF_NUMDIR]; p++)
+		if (p->dir_type == LIF_DIR_FS)
+			fsoff = lifstodb(p->dir_addr);
+
+	/* if no suitable lifdir entry found assume LIF_FILESTART */
+	if (fsoff < 0)
+		fsoff = btodb(LIF_FILESTART);
+
+	*partoffp = fsoff;
+
+	return readbsdlabel(bp, strat, 0,  fsoff + HPPA_LABELSECTOR,
+	    HPPA_LABELOFFSET, BIG_ENDIAN, lp, spoofonly);
+}
+#endif
+
+/*
+ * Check new disk label for sensibility
+ * before setting it.
+ */
+int
+setdisklabel(olp, nlp, openmask, osdep)
+	struct disklabel *olp, *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);
+
+	/*
+	 * XXX Nice thought, but it doesn't work, if the intention was to
+	 * force a reread at the next *readdisklabel call.  That does not
+	 * happen.  There's still some use for it though as you can pseudo-
+	 * partitition the disk.
+	 *
+	 * 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 dos partitions will be overwritten */
+
+	while (openmask != 0) {
+		i = ffs((long)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;
+{
+	enum disklabel_tag *tp;
+	char *msg = "no disk label";
+	struct buf *bp;
+	struct disklabel dl;
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+	struct cpu_disklabel cdl;
+#endif
+	int labeloffset, error, i, endian, partoff = 0, cyl = 0;
+	u_int64_t csum, *p;
+
+	/* get a buffer and initialize it */
+	bp = geteblk((int)lp->d_secsize);
+	bp->b_dev = dev;
+
+	/*
+	 * I once played with the thought of using osdep->label{tag,sector}
+	 * as a cache for knowing where (and what) to write.  However, now I
+	 * think it might be useful to reprobe if someone has written
+	 * a newer disklabel of another type with disklabel(8) and -r.
+	 */
+	for (tp = probe_order; msg && *tp != -1; tp++) {
+		dl = *lp;
+		switch (*tp) {
+		case DLT_ALPHA:
+#if defined(DISKLABEL_ALPHA) || defined(DISKLABEL_ALL)
+			msg = readbsdlabel(bp, strat, 0, ALPHA_LABELSECTOR,
+			    ALPHA_LABELOFFSET, LITTLE_ENDIAN, &dl, 0);
+			labeloffset = ALPHA_LABELOFFSET;
+			endian = LITTLE_ENDIAN;
+#endif
+			break;
+
+		case DLT_I386:
+#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL)
+			msg = readdoslabel(bp, strat, &dl, &cdl, &partoff,
+			    &cyl, 0);
+			labeloffset = I386_LABELOFFSET;
+			endian = LITTLE_ENDIAN;
+#endif
+			break;
+
+		case DLT_AMIGA:
+#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL)
+			msg = readamigalabel(bp, strat, &dl, &cdl, 0);
+			labeloffset = AMIGA_LABELOFFSET;
+			endian = BIG_ENDIAN;
+#endif
+			break;
+
+		case DLT_HPPA:
+#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL)
+			msg = readliflabel(bp, strat, &dl, &cdl, &partoff,
+			    &cyl, 0);
+			labeloffset = HPPA_LABELOFFSET;
+			endian = BIG_ENDIAN;
+#endif
+			break;
+
+		default:
+			panic("unrecognized disklabel tag %d", *tp);
+		}
+	}
+
+	if (msg) {
+		if (partoff == -1)
+			return EIO;
+
+		/* Write it in the regular place with native byte order. */
+		labeloffset = LABELOFFSET;
+		endian = BYTE_ORDER;
+		bp->b_blkno = partoff + LABELSECTOR;
+		bp->b_cylin = cyl;
+		bp->b_bcount = lp->d_secsize;
+	}
+
+	if (endian != BYTE_ORDER) {
+		swapdisklabel(lp);
+		/* recalc checksum */
+		lp->d_checksum = 0;
+		lp->d_checksum = dkcksum(lp);
+	}
+
+	*(struct disklabel *)(bp->b_data + labeloffset) = *lp;
+
+	/* Alpha bootblocks are checksummed.  */
+	if (*tp == DLT_ALPHA) {
+		for (csum = i = 0, p = (u_int64_t *)bp->b_data; i < 63; i++)
+			csum += *p++;
+		*p = csum;
+	}
+
+	bp->b_flags = B_BUSY | B_WRITE;
+	(*strat)(bp);
+	error = biowait(bp);
+
+	bp->b_flags |= B_INVAL;
+	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, osdep, wlabel)
+	struct buf *bp;
+	struct disklabel *lp;
+	struct cpu_disklabel *osdep;
+	int wlabel;
+{
+#define blockpersec(count, lp) ((count) * (((lp)->d_secsize) / DEV_BSIZE))
+	struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
+	int labelsector = blockpersec(lp->d_partitions[RAW_PART].p_offset,
+	    lp) + osdep->labelsector;
+	int sz = howmany(bp->b_bcount, DEV_BSIZE);
+
+	/* avoid division by zero */
+	if (lp->d_secpercyl == 0) {
+		bp->b_error = EINVAL;
+		goto bad;
+	}
+
+	/* beyond partition? */
+	if (bp->b_blkno + sz > blockpersec(p->p_size, lp)) {
+		sz = blockpersec(p->p_size, lp) - bp->b_blkno;
+		if (sz == 0) {
+			/* If exactly at end of disk, return EOF. */
+			bp->b_resid = bp->b_bcount;
+			goto done;
+		}
+		if (sz < 0) {
+			/* If past end of disk, return EINVAL. */
+			bp->b_error = EINVAL;
+			goto bad;
+		}
+		/* Otherwise, truncate request. */
+		bp->b_bcount = sz << DEV_BSHIFT;
+	}
+
+	/* Overwriting disk label? */
+	if (bp->b_blkno + blockpersec(p->p_offset, lp) <= labelsector &&
+	    bp->b_blkno + blockpersec(p->p_offset, lp) + sz > labelsector &&
+	    (bp->b_flags & B_READ) == 0 && !wlabel) {
+		bp->b_error = EROFS;
+		goto bad;
+	}
+
+	/* calculate cylinder for disksort to order transfers with */
+	bp->b_cylin = (bp->b_blkno + blockpersec(p->p_offset, lp)) /
+	    lp->d_secpercyl;
+	return (1);
+
+bad:
+	bp->b_flags |= B_ERROR;
+done:
+	return (0);
+}