--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/sql/SRC/Server/SqlSrvDriveSpace.h	Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,107 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// Reserving/Accessing/Releasing drive space - CSqlDriveSpace and RSqlDriveSpaceCol classes declarations
+// 
+//
+
+#ifndef __SQLSRVDRIVESPACE_H__
+#define __SQLSRVDRIVESPACE_H__
+
+#include <f32file.h>
+
+//Forward declarations
+class RSqlDriveSpaceCol;
+class CSqlServer;
+
+#ifdef _DEBUG
+#define SQLDRIVESPACE_INVARIANT() Invariant()
+#define SQLDRIVESPACECOL_INVARIANT() Invariant()
+#else
+#define SQLDRIVESPACE_INVARIANT() void(0)
+#define SQLDRIVESPACECOL_INVARIANT() void(0)
+#endif
+
+/**
+This class describes an object, which is responsible for handling
+"reserve/get access/release" requests for a particular drive.
+
+Since the drive may be shared between more than one server side session and there is only one RFs instance,
+the current solution is that CSqlDriveSpace objects reserve some predefined amount of disk space
+at the time of their creation and then the access to the reserved disk space is reference counted.
+    There is one obvious disadvantage of this solution: if a bad application "forgets" to release
+the access to the reserved disk space, then the reserved (but not released) disk space may be used by the server.
+At the moment, when some client will really need the reserved disk space to complete its "delete" transaction, 
+it may happen that there is no reserved disk space at all. 
+
+@see RSqlDriveSpaceCol
+@internalComponent
+*/
+NONSHARABLE_CLASS(CSqlDriveSpace) : public CBase
+	{
+public:
+	static CSqlDriveSpace* NewLC(RFs& aFs, TDriveNumber aDrive);
+    virtual ~CSqlDriveSpace();
+	inline TDriveNumber Drive() const;
+	void GetAccessL();
+	void ReleaseAccess();
+	void Invariant() const;
+
+private:
+	CSqlDriveSpace(RFs& aFs, TDriveNumber aDrive);
+    void ConstructL();
+
+private:
+	RFs& 			iFs;               	//File session reference
+	TDriveNumber 	iDrive;    			//Drive number
+	TInt 			iGetAccessRefCnt;	//"Get access" requests count
+
+	};
+
+/**
+@return The drive number, where the CSqlDriveSpace object handles the reservation requests
+*/
+inline TDriveNumber CSqlDriveSpace::Drive() const
+    {
+    return iDrive;
+    }
+
+/**
+This class describes a collection of CSqlDriveSpace objects. Each CSqlDriveSpace object in the
+collection is responsible for handling "reserve/get access/release" requests for a particular
+drive.
+
+Only one RSqlDriveSpaceCol instance should be created (resp. destroyed) by the CSqlServer object.
+
+@see CSqlServer
+@see CSqlDriveSpace
+
+@internalComponent
+*/
+NONSHARABLE_CLASS(RSqlDriveSpaceCol)
+	{
+public:
+	RSqlDriveSpaceCol();
+	void Create(RFs& aFs);
+	void ResetAndDestroy();
+    CSqlDriveSpace* Find(TDriveNumber aDrive);
+    CSqlDriveSpace* AddL(TDriveNumber aDrive);
+	void Invariant() const;
+
+private:
+	RFs*				        	iFs;            //File session reference
+	RPointerArray<CSqlDriveSpace>	iDriveSpaceCol; //Collection of CSqlDriveSpace objects: one per drive
+
+	};
+
+#endif//__SQLSRVDRIVESPACE_H__