code: boolean isValidToCreate(String src) {
      String srcs = normalizePath(src);
      byte[][] components = INodeDirectory.getPathComponents(srcs);
      readLock();
      try {
        if (srcs.startsWith("/") &&
            !srcs.endsWith("/") &&
            rootDir.getNode(components) == null) {
          return true;
        } else {
          return false;
        }
      } finally {
        readUnlock();
      }
    }
docs: Check whether the filepath could be created