diff -r a179b74831c9 -r c1f20ce4abcf userlibandfileserver/fileserver/sfile/sf_cache_client.cpp
--- a/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Thu Aug 19 11:14:22 2010 +0300
+++ b/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Tue Aug 31 16:34:26 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()
 	{