From a91fb0ebab8b44d15e1fadf219838356be8d1010 Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Mon, 7 Apr 1997 08:59:19 +0000
Subject: [PATCH] deal with partition/block size differences

---
 sys/arch/hp300/hp300/disksubr.c | 34 +++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/sys/arch/hp300/hp300/disksubr.c b/sys/arch/hp300/hp300/disksubr.c
index d96bdf81ba5..1256d41c6d3 100644
--- a/sys/arch/hp300/hp300/disksubr.c
+++ b/sys/arch/hp300/hp300/disksubr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: disksubr.c,v 1.3 1997/01/12 15:13:14 downsj Exp $	*/
+/*	$OpenBSD: disksubr.c,v 1.4 1997/04/07 08:59:19 deraadt Exp $	*/
 /*	$NetBSD: disksubr.c,v 1.8 1996/02/02 19:50:26 scottr Exp $	*/
 
 /*
@@ -95,8 +95,12 @@ readdisklabel(dev, strat, lp, osdep)
 	    DEV_BSIZE - sizeof(*dlp));
 	    dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
 		if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
-			if (msg == NULL)
-				msg = "no disk label";
+			if (msg == NULL) {
+#if defined(CD9660)
+				if (iso_disklabelspoof(dev, strat, lp) != 0)
+#endif
+					msg = "no disk label";
+			}
 		} else if (dlp->d_npartitions > MAXPARTITIONS ||
 			   dkcksum(dlp) != 0)
 			msg = "disk label corrupted";
@@ -211,39 +215,41 @@ bounds_check_with_label(bp, lp, wlabel)
 	struct disklabel *lp;
 	int wlabel;
 {
+#define blockpersec(count, lp) ((count) * (((lp)->d_secsize) / DEV_BSIZE))
 	struct partition *p = &lp->d_partitions[DISKPART(bp->b_dev)];
-	int labelsect = lp->d_partitions[0].p_offset;
-	int maxsz = p->p_size;
-	int sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
+	int labelsect = blockpersec(lp->d_partitions[0].p_offset, lp) +
+	    LABELSECTOR;
+	int sz = howmany(bp->b_bcount, DEV_BSIZE);
 
 	/* Overwriting disk label? */
-	if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
+	if (bp->b_blkno + blockpersec(p->p_offset, lp) <= labelsect &&
 	    (bp->b_flags & B_READ) == 0 && !wlabel) {
 		bp->b_error = EROFS;
 		goto bad;
 	}
 
 	/* beyond partition? */
-	if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
-		if (bp->b_blkno == maxsz) {
+	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;
 			return (0);
 		}
-		/* ...or truncate if part of it fits */
-		sz = maxsz - bp->b_blkno;
-		if (sz <= 0) {
+		if (sz < 0) {
 			bp->b_error = EINVAL;
 			goto bad;
 		}
+		/* ... or truncate if part of it fits */
 		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;
+	bp->b_resid = (bp->b_blkno + blockpersec(p->p_offset, lp)) /
+	    lp->d_secpercyl;
 	return (1);
 
- bad:
+bad:
 	bp->b_flags |= B_ERROR;
 	return (-1);
 }
-- 
2.20.1