zdtm: Add test for mount namespace w/o mountpoints

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Andrew Vagin <avagin@parallels.com>

test/zdtm.sh

@@ -138,6 +138,7 @@ ns/static/tun
 static/netns-nf
 static/netns
 static/cgroup00
+ns/static/clean_mntns
 "
 
 TEST_CR_KERNEL="
@@ -168,6 +169,7 @@ bind-mount
 mountpoints
 inotify_irmap
 cgroup00
+clean_mntns
 "
 
 source $(readlink -f `dirname $0`/env.sh) || exit 1

test/zdtm/live/static/Makefile

@@ -108,6 +108,7 @@ TST_NOFILE	=				\
 		tun				\
 		stopped				\
 		rtc				\
+		clean_mntns			\
 #		jobctl00			\
 
 TST_FILE	=				\

test/zdtm/live/static/clean_mntns.c

+#include <errno.h>
+#include <unistd.h>
+#include <sys/mount.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that clean mntns works";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+int main(int argc, char **argv)
+{
+	test_init(argc, argv);
+
+	if (umount("/proc") < 0)
+		err("Can't umount proc\n");
+
+	if (umount("/dev/pts") < 0)
+		err("Can't umount devpts\n");
+
+	test_daemon();
+	test_waitsig();
+
+	pass();
+	return 0;
+}