From ddc0cb6817f86bd4f73d449193a4e250936085b4 Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Mon, 14 Mar 2005 15:22:18 +0000
Subject: [PATCH] Do not attach MBR on top of an MBR.  This removes some
 confusing slice names on disks with extended partitions.

Spotted on:	Mother-in-laws computer.
---
 sys/geom/geom_mbr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/geom/geom_mbr.c b/sys/geom/geom_mbr.c
index 868c0e0c7e88..b7d832b788ce 100644
--- a/sys/geom/geom_mbr.c
+++ b/sys/geom/geom_mbr.c
@@ -267,6 +267,8 @@ g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
 
 	g_trace(G_T_TOPOLOGY, "mbr_taste(%s,%s)", mp->name, pp->name);
 	g_topology_assert();
+	if (!strcmp(pp->geom->class->name, MBR_CLASS_NAME))
+		return (NULL);
 	gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_mbr_start);
 	if (gp == NULL)
 		return (NULL);