private long saveInodes(FileSummary.Builder summary) throws IOException { FSImageFormatPBINode.Saver saver = new FSImageFormatPBINode.Saver(this, summary); saver.serializeINodeSection(sectionOutputStream); saver.serializeINodeDirectorySection(sectionOutputStream); saver.serializeFilesUCSection(sectionOutputStream); return saver.getNumImageErrors(); }