Index: src/libchcore/TOverlappedReaderWriter.h
===================================================================
diff -u -N -r1506d51ff1c0a5d156dab398051efc0c87473e81 -re0588f4598dea526e0869360a0f5ee278e7902a0
--- src/libchcore/TOverlappedReaderWriter.h	(.../TOverlappedReaderWriter.h)	(revision 1506d51ff1c0a5d156dab398051efc0c87473e81)
+++ src/libchcore/TOverlappedReaderWriter.h	(.../TOverlappedReaderWriter.h)	(revision e0588f4598dea526e0869360a0f5ee278e7902a0)
@@ -30,6 +30,9 @@
 {
 	class TOverlappedReaderWriter
 	{
+	private:
+		static const unsigned long long NoIoError = 0xffffffffffffffff;
+
 	public:
 		explicit TOverlappedReaderWriter(const logger::TLogFileDataPtr& spLogFileData, const TOverlappedMemoryPoolPtr& spBuffers,
 			file_size_t ullFilePos, DWORD dwChunkSize);
@@ -88,6 +91,8 @@
 		DWORD m_dwDataChunkSize = 0;
 
 		unsigned long long m_ullNextReadBufferOrder = 0;	// next order id for read buffers
+		unsigned long long m_ullReadErrorOrder = NoIoError;
+
 		unsigned long long m_ullNextWriteBufferOrder = 0;	// next order id to be processed when writing
 		unsigned long long m_ullNextFinishedBufferOrder = 0;	// next order id to be processed when finishing writing