diff -r 0ff03867bdb6 -r 39b39e1a406e userlibandfileserver/fileserver/sfile/sf_cache_client.cpp
--- a/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Wed Jul 21 14:46:58 2010 +0100
+++ b/userlibandfileserver/fileserver/sfile/sf_cache_client.cpp	Thu Jul 22 16:46:39 2010 +0100
@@ -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()
 	{