The dosparts member of cpu_disklabel was not used for any persistant

data. Eliminate it, and just use the data being read in while
processing MBR and EBR records.

Should be no functional change.

ok weingart@ deraadt@

2 files changed, 143 insertions, 148 deletions

diff --git a/sys/arch/amd64/amd64/disksubr.c b/sys/arch/amd64/amd64/disksubr.c
index a69436e2847..39774fc600c 100644
--- a/sys/arch/amd64/amd64/disksubr.c
+++ b/sys/arch/amd64/amd64/disksubr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: disksubr.c,v 1.18 2006/10/12 00:25:19 krw Exp $	*/
+/*	$OpenBSD: disksubr.c,v 1.19 2006/10/17 23:42:37 krw Exp $	*/
 /*	$NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $	*/
 
 /*
@@ -67,11 +67,14 @@ readdisklabel(dev, strat, lp, osdep, spoofonly)
 	struct cpu_disklabel *osdep;
 	int spoofonly;
 {
-	struct dos_partition *dp = osdep->dosparts, *dp2;
-	struct buf *bp = NULL;
+	struct dos_partition *dp, *dp2;
 	struct disklabel *dlp;
+	unsigned long extoff = 0;
+	struct buf *bp = NULL;
+	daddr_t part_blkno = DOSBBSECTOR;
 	char *msg = NULL, *cp;
 	int dospartoff, cyl, i, ourpart = -1;
+	int wander = 1, n = 0, loop = 0;
 
 	/* minimal requirements for archetypal disk label */
 	if (lp->d_secsize < DEV_BSIZE)
@@ -96,133 +99,128 @@ readdisklabel(dev, strat, lp, osdep, spoofonly)
 	/* do dos partitions in the process of getting disklabel? */
 	dospartoff = 0;
 	cyl = 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;
+		if (part_blkno < extoff)
+			part_blkno = extoff;
+
+		/* read boot record */
+		bp->b_blkno = part_blkno;
+		bp->b_bcount = lp->d_secsize;
+		bp->b_flags = B_BUSY | B_READ;
+		bp->b_cylinder = part_blkno / lp->d_secpercyl;
+		(*strat)(bp);
+	     
+		/* if successful, wander through dos partition table */
+		if (biowait(bp)) {
+			msg = "dos partition I/O error";
+			goto done;
+		}
+		dp = (struct dos_partition *)(bp->b_data + DOSPARTOFF);
+
+		if (ourpart == -1) {
+			/* Search for our MBR partition */
+			for (dp2=dp, i=0; i < NDOSPART && ourpart == -1;
+			    i++, dp2++)
+				if (letoh32(dp2->dp_size) &&
+				    dp2->dp_typ == DOSPTYP_OPENBSD)
+					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 = letoh32(dp2->dp_start) + part_blkno;
+			cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect);
+
+			/* XXX build a temporary disklabel */
+			lp->d_partitions[0].p_size = letoh32(dp2->dp_size);
+			lp->d_partitions[0].p_offset =
+				letoh32(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:
 		/*
-		 * Read dos partition table, follow extended partitions.
-		 * Map the partitions to disklabel entries i-p
+		 * In case the disklabel read below fails, we want to
+		 * provide a fake label in i-p.
 		 */
-		while (wander && n < 8 && loop < 8) {
-		        loop++;
-			wander = 0;
-			if (part_blkno < extoff)
-				part_blkno = extoff;
-
-			/* read boot record */
-			bp->b_blkno = part_blkno;
-			bp->b_bcount = lp->d_secsize;
-			bp->b_flags = B_BUSY | B_READ;
-			bp->b_cylinder = part_blkno / lp->d_secpercyl;
-			(*strat)(bp);
-		     
-			/* if successful, wander through dos partition table */
-			if (biowait(bp)) {
-				msg = "dos partition I/O error";
-				goto done;
-			}
-			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 (letoh32(dp2->dp_size) &&
-					    dp2->dp_typ == DOSPTYP_OPENBSD)
-						ourpart = i;
-				if (ourpart == -1)
-					goto donot;
+		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 (letoh32(dp2->dp_size) > lp->d_secperunit)
+				continue;
+			if (letoh32(dp2->dp_size))
+				pp->p_size = letoh32(dp2->dp_size);
+			if (letoh32(dp2->dp_start))
+				pp->p_offset =
+				    letoh32(dp2->dp_start) + part_blkno;
+
+			switch (dp2->dp_typ) {
+			case DOSPTYP_UNUSED:
+				for (cp = (char *)dp2;
+				    cp < (char *)(dp2 + 1); cp++)
+					if (*cp)
+						break;
 				/*
-				 * This is our MBR partition. need sector address
-				 * for SCSI/IDE, cylinder for ESDI/ST506/RLL
+				 * Was it all zeroes?  If so, it is
+				 * an unused entry that we don't
+				 * want to show.
 				 */
-				dp2 = &dp[ourpart];
-				dospartoff = letoh32(dp2->dp_start) + part_blkno;
-				cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect);
-
-				/* XXX build a temporary disklabel */
-				lp->d_partitions[0].p_size = letoh32(dp2->dp_size);
-				lp->d_partitions[0].p_offset =
-					letoh32(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 (letoh32(dp2->dp_size) > lp->d_secperunit)
-					continue;
-				if (letoh32(dp2->dp_size))
-					pp->p_size = letoh32(dp2->dp_size);
-				if (letoh32(dp2->dp_start))
-					pp->p_offset =
-					    letoh32(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:
-				case DOSPTYP_EXTENDL:
-					part_blkno = letoh32(dp2->dp_start) + extoff;
-					if (!extoff) {
-						extoff = letoh32(dp2->dp_start);
-						part_blkno = 0;
-					}
-					wander = 1;
-					break;
-				default:
-					pp->p_fstype = FS_OTHER;
-					n++;
-					break;
+				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:
+			case DOSPTYP_EXTENDL:
+				part_blkno = letoh32(dp2->dp_start) + extoff;
+				if (!extoff) {
+					extoff = letoh32(dp2->dp_start);
+					part_blkno = 0;
 				}
+				wander = 1;
+				break;
+			default:
+				pp->p_fstype = FS_OTHER;
+				n++;
+				break;
 			}
 		}
-		lp->d_bbsize = 8192;
-		lp->d_sbsize = 64*1024;		/* XXX ? */
-		lp->d_npartitions = MAXPARTITIONS;
 	}
+	lp->d_bbsize = 8192;
+	lp->d_sbsize = 64*1024;		/* XXX ? */
+	lp->d_npartitions = MAXPARTITIONS;
 
 	/* don't read the on-disk label if we are in spoofed-only mode */
 	if (spoofonly)
@@ -345,7 +343,7 @@ writedisklabel(dev, strat, lp, osdep)
 	register struct disklabel *lp;
 	struct cpu_disklabel *osdep;
 {
-	struct dos_partition *dp = osdep->dosparts, *dp2;
+	struct dos_partition *dp, *dp2;
 	struct buf *bp;
 	struct disklabel *dlp;
 	int error, dospartoff, cyl, i;
@@ -358,35 +356,33 @@ writedisklabel(dev, strat, lp, osdep)
 	/* do dos partitions in the process of getting disklabel? */
 	dospartoff = 0;
 	cyl = LABELSECTOR / lp->d_secpercyl;
-	if (dp) {
-		/* read master boot record */
-		bp->b_blkno = DOSBBSECTOR;
-		bp->b_bcount = lp->d_secsize;
-		bp->b_flags = B_BUSY | B_READ;
-		bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl;
-		(*strat)(bp);
 
-		if ((error = biowait(bp)) != 0)
-			goto done;
+	/* read master boot record */
+	bp->b_blkno = DOSBBSECTOR;
+	bp->b_bcount = lp->d_secsize;
+	bp->b_flags = B_BUSY | B_READ;
+	bp->b_cylinder = DOSBBSECTOR / lp->d_secpercyl;
+	(*strat)(bp);
+
+	if ((error = biowait(bp)) != 0)
+		goto done;
 
-		/* XXX how do we check veracity/bounds of this? */
-		bcopy(bp->b_data + DOSPARTOFF, dp,
-		    NDOSPART * sizeof(*dp));
+	/* XXX how do we check veracity/bounds of this? */
+	dp = (struct dos_partition *)(bp->b_data + DOSPARTOFF);
 
-		for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++)
-			if (letoh32(dp2->dp_size) && dp2->dp_typ == DOSPTYP_OPENBSD)
-				ourpart = i;
+	for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++)
+		if (letoh32(dp2->dp_size) && dp2->dp_typ == DOSPTYP_OPENBSD)
+			ourpart = i;
 
-		if (ourpart != -1) {
-			dp2 = &dp[ourpart];
+	if (ourpart != -1) {
+		dp2 = &dp[ourpart];
 
-			/*
-			 * need sector address for SCSI/IDE,
-			 * cylinder for ESDI/ST506/RLL
-			 */
-			dospartoff = letoh32(dp2->dp_start);
-			cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect);
-		}
+		/*
+		 * need sector address for SCSI/IDE,
+		 * cylinder for ESDI/ST506/RLL
+		 */
+		dospartoff = letoh32(dp2->dp_start);
+		cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect);
 	}
 
 	/* next, dig out disk label */
diff --git a/sys/arch/amd64/include/disklabel.h b/sys/arch/amd64/include/disklabel.h
index a326912037d..0e8b46bb451 100644
--- a/sys/arch/amd64/include/disklabel.h
+++ b/sys/arch/amd64/include/disklabel.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: disklabel.h,v 1.5 2006/10/04 00:52:55 krw Exp $	*/
+/*	$OpenBSD: disklabel.h,v 1.6 2006/10/17 23:42:37 krw Exp $	*/
 /*	$NetBSD: disklabel.h,v 1.3 1996/03/09 20:52:54 ghudson Exp $	*/
 
 /*
@@ -85,7 +85,6 @@ struct dos_mbr {
 #define DOSMBR_SIGNATURE_OFF	(0x1fe)
 
 struct cpu_disklabel {
-	struct dos_partition dosparts[NDOSPART];
 };
 
 /* Isolate the relevant bits to get sector and cylinder. */