Fail to start server if detected cross-device mounts. (#4807)

Fixes #4764

pkg/mountinfo/mountinfo_others.go

@@ -0,0 +1,25 @@
+// +build !linux
+
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package mountinfo
+
+// CheckCrossDevice - check if any input path has multiple sub-mounts.
+// this is a dummy function and returns nil for now.
+func CheckCrossDevice(paths []string) error {
+	return nil
+}