diff -r 75252ea6123b -r c7a0ce20c48c userlibandfileserver/fileserver/sfile/sf_plugin.h
--- a/userlibandfileserver/fileserver/sfile/sf_plugin.h	Mon Jul 26 10:52:56 2010 +0100
+++ b/userlibandfileserver/fileserver/sfile/sf_plugin.h	Fri Aug 06 16:34:38 2010 +0100
@@ -60,8 +60,8 @@
 	static TInt InstallPluginFactory(CFsPluginFactory* aFactory,RLibrary aLib);
 	static CFsPluginFactory* GetPluginFactory(const TDesC& aName);
 
-	static TInt NextPlugin(CFsPlugin*& aPlugin, CFsMessageRequest* aMsgRequest, TBool aLock, TBool aCheckCurrentOperation=ETrue);
-	static TInt PrevPlugin(CFsPlugin*& aPlugin, CFsMessageRequest* aMsgRequest, TBool aLock);
+	static TInt NextPlugin(CFsPlugin*& aPlugin, CFsMessageRequest* aMsgRequest, TBool aCheckCurrentOperation=ETrue);
+	static TInt PrevPlugin(CFsPlugin*& aPlugin, CFsMessageRequest* aMsgRequest);
 	static TInt InsertInPluginStack(CFsPlugin*& aPlugin,TInt aPos);
 	static TInt IsInChain(TInt aUPos, TInt aPos,TInt aDrive, CFsPluginFactory* aPluginFactory);
 	static CFsPlugin* FindByUniquePosition(TInt aPos);
@@ -72,7 +72,8 @@
 	static TInt ChainCount();
 	static TInt Plugin(CFsPlugin*& aPlugin, TInt aPos);
 
-	static void LockChain();
+	static void ReadLockChain();
+	static void WriteLockChain();
 	static void UnlockChain();
 
 	static CFsPluginConn* CreatePluginConnL(TInt aUniquePosition, TUint aClientId);
@@ -91,7 +92,7 @@
 	static CFsObjectCon* iPluginConns;
 
 	static RPointerArray<CFsPlugin> iPluginChain;
-	static RFastLock iChainLock;
+	static RReadWriteLock iChainLock;
 
 	static CFsSyncMessageScheduler* iScheduler;