zdtm: check --ext-mount-map auto

Cc: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -559,6 +559,10 @@ start_test()
 		echo "Test failed to start"
 		return 1
 	fi
+
+	mount --make-private "$ZDTM_ROOT"
+	umount -l "$ZDTM_ROOT"
+	mount --make-private --bind . $ZDTM_ROOT || return 1
 }
 
 stop_test()

test/zdtm/lib/ns.c

@@ -36,7 +36,7 @@ static int prepare_mntns()
 		 * under them. So we need to create another mount for the
 		 * new root.
 		 */
-		if (mount("/", "/", NULL, MS_PRIVATE | MS_REC, NULL)) {
+		if (mount(root, root, NULL, MS_SLAVE , NULL)) {
 			fprintf(stderr, "Can't bind-mount root: %m\n");
 			return -1;
 		}
@@ -72,6 +72,11 @@ static int prepare_mntns()
 			return -1;
 		}
 
+		if (mount("./old", "./old", NULL, MS_PRIVATE | MS_REC , NULL)) {
+			fprintf(stderr, "Can't bind-mount root: %m\n");
+			return -1;
+		}
+
 		if (mkdir("proc", 0777) && errno != EEXIST) {
 			fprintf(stderr, "mkdir(proc) failed: %m\n");
 			return -1;

test/zdtm/live/static/Makefile

@@ -187,6 +187,7 @@ TST_DIR		=				\
 		mntns_shared_bind		\
 		mntns_shared_bind02		\
 		mntns_root_bind			\
+		mnt_ext_auto			\
 
 TST_DIR_FILE	=				\
 		chroot				\

test/zdtm/live/static/mnt_ext_auto.c

+#include <sys/mount.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <linux/limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Run busy loop while migrating";
+const char *test_author	= "Roman Kagan <rkagan@parallels.com>";
+
+char *dirname = "mnt_ext_auto.test";
+TEST_OPTION(dirname, string, "directory name", 1);
+
+int main(int argc, char ** argv)
+{
+	char src[PATH_MAX], dst[PATH_MAX], *root;
+	char *dname = "/tmp/zdtm_ext_auto.XXXXXX";
+	int status;
+	pid_t pid;
+
+	root = getenv("ZDTM_ROOT");
+	if (root == NULL) {
+		err("root");
+		return 1;
+	}
+
+	sprintf(dst, "%s/ext_mounts", getenv("ZDTM_ROOT"));
+
+	if (strcmp(getenv("ZDTM_NEWNS"), "1"))
+		goto test;
+
+	pid = fork();
+	if (pid < 0)
+		return 1;
+	if (pid == 0) {
+		test_ext_init(argc, argv);
+
+		mkdir(dname, 755);
+		sprintf(src, "%s/test", dname);
+		if (mount("zdtm_auto_ext_mnt", dname, "tmpfs", 0, NULL)) {
+			err("mount");
+			return 1;
+		}
+		mkdir(src, 755);
+		mkdir(dst, 755);
+		if (mount(src, dst, NULL, MS_BIND, NULL)) {
+			err("bind");
+			return 1;
+		}
+		return 0;
+	}
+
+	wait(&status);
+	if (status != 0)
+		return 1;
+
+test:
+	test_init(argc, argv);
+
+	test_daemon();
+	test_waitsig();
+
+
+	pass();
+
+	return 0;
+}

test/zdtm/live/static/mnt_ext_auto.opts

+--ext-mount-map auto --enable-external-sharing