diff -r 000000000000 -r 7f656887cf89 commands/ffstrace/ffstraceplugin.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/commands/ffstrace/ffstraceplugin.cpp	Wed Jun 23 15:52:26 2010 +0100
@@ -0,0 +1,230 @@
+// ffstraceplugin.cpp
+// 
+// Copyright (c) 2010 Accenture. All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+// 
+// Initial Contributors:
+// Accenture - Initial contribution
+//
+
+#include <fshell/extrabtrace.h>
+#include <f32plugin.h>
+#include <f32pluginutils.h>
+#include <fshell/ltkutils.h>
+
+//#define LOG_FUNC() RDebug::Printf(__PRETTY_FUNCTION__)
+//#define LOG(args...) RDebug::Printf(args)
+//#define LOGW(args...) RDebug::Print(args)
+#define LOG_FUNC()
+#define LOG(args...)
+#define LOGW(args...)
+
+
+NONSHARABLE_CLASS(CFfsTracerPluginFactory) : public CFsPluginFactory
+	{
+public:
+	static CFfsTracerPluginFactory* NewL();
+
+	// from CFsPluginFactory
+	virtual TInt Install();
+	virtual CFsPlugin* NewPluginL();
+	virtual TInt UniquePosition();
+
+private:
+	CFfsTracerPluginFactory();
+	};
+
+NONSHARABLE_CLASS(CFfsTracerFsPlugin) : public CFsPlugin
+	{
+public:
+	static CFfsTracerFsPlugin* NewL();
+	virtual ~CFfsTracerFsPlugin();
+	
+	// from CFsPlugin
+	virtual void InitialiseL();
+	TInt SessionDisconnect(CSessionFs* aSession);
+	virtual TInt DoRequestL(TFsPluginRequest& aRequest);
+	virtual CFsPluginConn* NewPluginConnL();
+private:
+	CFfsTracerFsPlugin();
+	};
+	
+class CFfsTracerFsPluginConn : public CFsPluginConn
+	{
+public:
+	CFfsTracerFsPluginConn();
+
+	// from CFsPluginConn
+	virtual TInt DoControl(CFsPluginConnRequest& aRequest);
+	virtual void DoRequest(CFsPluginConnRequest& aRequest);
+	virtual void DoCancel(TInt aReqMask);
+	};
+
+extern "C" EXPORT_C CFsPluginFactory* CreateFileSystem()
+	{
+	return CFfsTracerPluginFactory::NewL();
+	}
+
+CFfsTracerPluginFactory* CFfsTracerPluginFactory::NewL()
+	{
+	return(new(ELeave) CFfsTracerPluginFactory());
+	}
+
+CFfsTracerPluginFactory::CFfsTracerPluginFactory()
+	{
+	}
+
+_LIT(KFfsTracerPluginName, "FfsTracePlugin");
+
+TInt CFfsTracerPluginFactory::Install()
+	{
+	LOG_FUNC();
+	iSupportedDrives = 0x7FFFFFF; // KPluginSupportAllDrives | KPluginVersionTwo. Not specified symbolically to be compatible with fileservers that didn't support v2 plugins
+	
+	TInt err;
+	err = SetName(&KFfsTracerPluginName);
+	LOG(" returned %d", err);
+	return err;
+	}
+
+CFsPlugin* CFfsTracerPluginFactory::NewPluginL()
+	{
+	return CFfsTracerFsPlugin::NewL();
+	}
+	
+TInt CFfsTracerPluginFactory::UniquePosition()
+	{
+	return 1; // Isn't used, apparently
+	}
+
+//
+
+CFfsTracerFsPluginConn::CFfsTracerFsPluginConn()
+	{
+	}
+
+TInt CFfsTracerFsPluginConn::DoControl(CFsPluginConnRequest& /*aRequest*/)
+	{
+	return KErrNone;
+	}
+
+void CFfsTracerFsPluginConn::DoRequest(CFsPluginConnRequest& /*aRequest*/)
+	{
+	}
+
+void CFfsTracerFsPluginConn::DoCancel(TInt /*aReqMask*/)
+	{
+	}
+
+//
+
+CFfsTracerFsPlugin* CFfsTracerFsPlugin::NewL()
+	{
+	return new(ELeave) CFfsTracerFsPlugin();
+	}
+	
+CFfsTracerFsPlugin::CFfsTracerFsPlugin()
+	{
+	LOG_FUNC();
+	}
+
+static const TFsMessage KMessages[] =
+	{
+	EFsDelete,
+	EFsRename,
+	EFsReplace,
+	EFsEntry,
+	EFsFileSubClose,
+	EFsFileOpen,
+	EFsFileCreate,
+	EFsFileReplace,
+	EFsFileTemp,
+	EFsFileRename,
+	};
+static const TInt KMessageCount = sizeof(KMessages) / sizeof(TFsMessage);
+
+CFfsTracerFsPlugin::~CFfsTracerFsPlugin()
+	{
+	LOG_FUNC();
+	for (TInt i = 0; i < KMessageCount; i++)
+		{
+		UnregisterIntercept(KMessages[i], CFsPlugin::EPrePostIntercept);
+		}
+	}
+
+void CFfsTracerFsPlugin::InitialiseL()
+	{
+	// intercept all calls at start
+	for (TInt i = 0; i < KMessageCount; i++)
+		{
+		RegisterIntercept(KMessages[i], CFsPlugin::EPrePostIntercept);
+		}
+	}
+
+TInt CFfsTracerFsPlugin::SessionDisconnect(CSessionFs* /*aSession*/)
+	{
+	// CSessionFs is a private class! It's in the main file server and 
+	// has no exported methods!  What's the use of passing it here?
+	return KErrNone;
+	}
+
+CFsPluginConn* CFfsTracerFsPlugin::NewPluginConnL()
+	{
+	LOG_FUNC();
+	return new(ELeave) CFfsTracerFsPluginConn();
+	}
+
+TInt CFfsTracerFsPlugin::DoRequestL(TFsPluginRequest& aRequest)
+	{
+	// This is where it all happens
+	
+	TInt subcat = 0;
+	TInt fn = aRequest.Function();
+	// Map from FS opcodes to the compacted btrace ones
+	switch (fn)
+		{
+		case EFsDelete: subcat = BTrace::EFfsDelete; break;
+		case EFsRename: subcat = BTrace::EFfsRename; break;
+		case EFsReplace: subcat = BTrace::EFfsReplace; break;
+		case EFsEntry: subcat = BTrace::EFfsEntry; break;
+		case EFsFileSubClose: subcat = BTrace::EFfsFileSubClose; break;
+		case EFsFileOpen: subcat = BTrace::EFfsFileOpen; break;
+		case EFsFileCreate: subcat = BTrace::EFfsFileCreate; break;
+		case EFsFileReplace: subcat = BTrace::EFfsFileReplace; break;
+		case EFsFileTemp: subcat = BTrace::EFfsFileTemp; break;
+		case EFsFileRename: subcat = BTrace::EFfsFileRename; break;
+		default:
+			// An operation we're not interested in
+			return KErrNone;
+		}
+	if (aRequest.IsPostOperation()) subcat |= BTrace::EFfsPost;
+
+	TBuf<513> name; // Twice as big as a max filename because for renames we need it to fit two TFileNames
+	GetName(&aRequest, name);
+
+	if (fn == EFsRename || fn == EFsFileRename)
+		{
+		name.Append(TChar(0));
+		TPtr newName((TUint16*)(name.Ptr() + name.Length()), 0, name.MaxLength() - name.Length());
+		GetNewName(&aRequest, newName);
+		LOGW(_L("new name is %S"), &newName);
+		name.SetLength(name.Length() + newName.Length());
+		}
+
+	// Only try to use request.Message() if it's a valid handle
+	TUint threadId = 0xFFFFFFFFu;
+	if(aRequest.Message().Handle() != KNullHandle)
+		{
+		RThread clientThread;
+		aRequest.Message().Client(clientThread, EOwnerThread);
+		threadId = clientThread.Id();
+		clientThread.Close();
+		}
+
+	BTraceBig(BTrace::EFfsTrace, subcat, threadId, name.Ptr(), name.Size());
+	
+	return KErrNone;
+	}