diff -r 73ea206103e6 -r 43365a9b78a3 userlibandfileserver/fileserver/sfile/sf_cache_client.cpp
--- a/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Wed Jun 23 19:44:53 2010 +0300
+++ b/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Tue Jul 06 15:50:07 2010 +0300
@@ -635,6 +635,13 @@
 	return EFalse;
 	}
 
+// return true if more than half of the segments in this file are locked
+TBool CCacheClient::LockedSegmentsHalfUsed()
+	{
+	if (LockedBytes() > (iMaxBytesCached >> 1))
+		return ETrue;
+	return EFalse;
+	}
 
 TInt CCacheClient::CachedBytes()
 	{