From bfc37a5112038f34125fd01633e6718dbf3fe6bf Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Sat, 14 Feb 2004 17:58:57 +0000
Subject: [PATCH] Add a KASSERT which checks that a class never fails a closing
 ->access() call.

---
 sys/geom/geom_subr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/geom/geom_subr.c b/sys/geom/geom_subr.c
index b6a9c7f34588..69a972d9448a 100644
--- a/sys/geom/geom_subr.c
+++ b/sys/geom/geom_subr.c
@@ -627,6 +627,9 @@ g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
 	/* Ok then... */
 
 	error = pp->geom->access(pp, dcr, dcw, dce);
+	KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0,
+	    ("Geom provider %s::%s failed closing ->access()",
+	    pp->geom->class->name, pp->name));
 	if (!error) {
 		/*
 		 * If we open first write, spoil any partner consumers.