From c0fdfdba2941a94f7f8581689489fa55f6e9898a Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Sat, 29 Mar 2003 22:06:52 +0000
Subject: [PATCH] Use default geometry in case the device doesn't provide one: 
 512 for sectorsize. 	63 for sectors. 	255 for heads. This will
 mostly show up on MD(4) devices.

---
 sbin/fdisk/fdisk.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sbin/fdisk/fdisk.c b/sbin/fdisk/fdisk.c
index db753fd7a95b..cea23170eb5b 100644
--- a/sbin/fdisk/fdisk.c
+++ b/sbin/fdisk/fdisk.c
@@ -780,15 +780,20 @@ get_params()
 	error = ioctl(fd, DIOCGFWSECTORS, &u);
 	if (error == 0)
 		sectors = dos_sectors = u;
+	else
+		sectors = dos_sectors = 63;
+
 	error = ioctl(fd, DIOCGFWHEADS, &u);
 	if (error == 0)
 		heads = dos_heads = u;
+	else
+		heads = dos_heads = 255;
 
 	dos_cylsecs = cylsecs = heads * sectors;
 	disksecs = cyls * heads * sectors;
 
 	error = ioctl(fd, DIOCGSECTORSIZE, &u);
-	if (error != 0)
+	if (error != 0 || u == 0)
 		u = 512;
 
 	error = ioctl(fd, DIOCGMEDIASIZE, &o);