code: private LocatedBlocks createLocatedBlocks(INode node) throws IOException {
       LocatedBlocks loc = null;
       if (node instanceof INodeFile) {
         loc = getFSNamesystem().getBlockLocationsInternal(
             (INodeFile)node, 0L, Long.MAX_VALUE, Integer.MAX_VALUE);
       }
       if (loc==null) {
         loc = EMPTY_BLOCK_LOCS;
       }
       return loc;
     }
docs: Create FileStatus with location info by file INode