// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of the License "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:

 // f32\sfsrv\cl_cli.cpp

 // 

 //

 #include "cl_std.h"

 #include <f32fsys.h>

 EFSRV_EXPORT_C TBool RFs::IsValidDrive(TInt aDrive)

 /**

 Tests whether the specified drive number is valid.

 A valid drive number is any number between 0 and (KMaxDrives-1) inclusive,

 or the specific value KDefaultDrive (implying the session default drive).

 @param aDrive The drive number.

 @return True if the drive is valid; false if not.				

 @see TDriveNumber 				

 */

 	{

 	return((aDrive>=0 && aDrive<KMaxDrives) || aDrive==KDefaultDrive);

 	}

 EFSRV_EXPORT_C TInt RFs::CharToDrive(TChar aChar,TInt& aDrive)

 /**

 Maps a drive character to a drive number.

 The drive character must be in the range A to Z or a to z. For example, drive A (or a)

 corresponds to zero, drive B (or b) corresponds to 1 etc. For the drive number

 enumeration, see TDriveNumber.

 @param aChar  The drive character.

 @param aDrive On return, contains the drive number.

 @return KErrNone, if successful;

         KErrArgument, if the drive character is not in the range A to Z or a to z.

 @see TDriveNumber        

 */

 	{

 	aChar.UpperCase();

 	if (aChar>='A' && aChar<='Z')

 		{

 		aDrive=(TInt)aChar-'A';

 		return(KErrNone);

 		}

 	return(KErrArgument);

 	}

 EFSRV_EXPORT_C TInt RFs::DriveToChar(TInt aDrive,TChar& aChar)

 /**

 Maps a drive number to the corresponding character.

 The drive number must be in the range 0 to (KMaxDrives-1). For example, drive

 number zero (EDriveA) corresponds to drive A, one (EDriveB)

 corresponds to drive B. For the drive number enumeration, see TDriveNumber.

 The drive number can also be KDefaultDrive, implying the default drive. In this

 case the current drive is taken and converted.

 @param aDrive The drive number.

 @param aChar  On return, contains the drive character.

 @return KErrNone, if successful;

         KErrArgument, if the drive number is invalid;

         otherwise one of the other system-wide error codes.

 */

 	{

 	if (aDrive==KDefaultDrive)

 		{

 		TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsDriveToChar, MODULEUID, aDrive);

 		RFs fs;

 		TFileName path;

 		TInt r=fs.Connect();

 		if (r!=KErrNone)

 			return(r);

 		r=fs.SessionPath(path);

 		fs.Close();

 		if (r!=KErrNone)

 			return(r);

 		aChar=path[0];

 		TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsDriveToCharReturn, MODULEUID, KErrNone, aChar);

 		return(KErrNone);

 		}

 	if (!IsValidDrive(aDrive))

 		return(KErrArgument);

 	aChar=aDrive+'A';

 	return(KErrNone);

 	}

 EFSRV_EXPORT_C TBool RFs::IsRomAddress(TAny *aPtr)

 /**

 Tests whether the specified address is in ROM.

 @param aPtr The address.

 @return True, if the address is in ROM; false, if not.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsIsRomAddress, MODULEUID, aPtr);

 	TBool res;

 	TInt r=User::IsRomAddress(res,aPtr); // Only returns error on WINS

 	if (r!=KErrNone)

 		res=EFalse;

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsIsRomAddressReturn, MODULEUID, res);

 	return(res);

 	}

 /** 

 Obtain the system drive number.

 The System Drive is a defined drive on the device which is:

  - Read/Writeable

  - Internal: Always available and not removable from the device

  - Non-Volatile (e.g. Flash memory, battery-backed RAM)

  - Only Accessible via Rfs (e.g. not available via USB mass storage)

 The System drive is utilised as:

  - Storage for Persistent settings from system and application software

  - Storage for Localisation resources

  - A Default Drive for user data

  - A Target Drive for Software installations

 It the system drive is not set previously (see RFs::SetSystemDrive) EDriveC is returned by default.

 @see RFs::GetSystemDriveChar

 @see RFs::SetSystemDrive   

 @see TDriveNumber

 @return TDriveNumber contains the drive number of the system drive.

  */

 EFSRV_EXPORT_C TDriveNumber RFs::GetSystemDrive()

     {

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsGetSystemDrive, MODULEUID);

     TInt drive;

 	TInt err = RProperty::Get(TSecureId(KFileServerUidValue), KSystemDriveKey, drive);

     if(err==KErrNone)

         {

         if((drive>=EDriveA) && (drive<=EDriveZ))

             {

 			TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsGetSystemDriveReturn, MODULEUID, drive);

             return static_cast<TDriveNumber>(drive);

             }

         }

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsGetSystemDriveReturn, MODULEUID, EDriveC);

     return EDriveC;

 	}

 /**

 This is a wrapper around GetSystemDrive() function. It returns the character corresponding to the system drive.

 @parameter aDriveChar On return, contains the system drive character

 @return KErrNone if successful, otherwise one of the other system-wide error codes

 @see RFs::GetSystemDrive

 */

 EFSRV_EXPORT_C TChar RFs::GetSystemDriveChar()

 	{

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsGetSystemDriveChar, MODULEUID);

 	TInt r = 'A' + GetSystemDrive();

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsGetSystemDriveCharReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Set a specified drive as a "System Drive", see RFs::GetSystemDrive().

 The "System Drive" can be set only once, any subsequent calls will result in the error 'KErrAlreadyExists'.

 The media type for the system drive shall be one of the: EMediaHardDisk, EMediaFlash, EMediaNANDFlash, EMediaRam

 Required drive attributes: KDriveAttLocal, KDriveAttInternal

 Prohibited drive attributes: KDriveAttRom,KDriveAttRedirected,KDriveAttSubsted,KDriveAttRemovable

 @param  aSystemDrive specifies the drive number to be set as System Drive

 @return KErrNone if successful, otherwise one of the other system-wide error codes

 @capability TCB

 */

 EFSRV_EXPORT_C TInt RFs::SetSystemDrive(TDriveNumber aSystemDrive)

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsSetSystemDrive, MODULEUID, Handle(), aSystemDrive);

     TInt r = SendReceive(EFsSetSystemDrive, TIpcArgs(aSystemDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetSystemDriveReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Connect(TInt aMessageSlots)

 /**

 Connects a client to the file server.

 To end the file server session, use Close().

 @param aMessageSlots The number of message slots required. The default value of

 				     KFileServerDefaultMessageSlots indicates that message

 				     slots will be acquired dynamically from the system

 				     wide pool. Override this value with a fixed number, if

 				     a fixed number of slots are to be allocated to the session.

 				     If overriding, note that the number of message slots

 				     represents the number of operations, such as reads

 				     and writes, that can be outstanding at once;

 				     always remember to provide a spare slot for

 				     the cancel operation.

 @return KErrNone, if successful, otherwise one of the other system-wide

         error codes.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsConnect, MODULEUID, aMessageSlots);

 	_LIT(KFileServerName,"!FileServer");

 	TInt r = CreateSession(KFileServerName,Version(),aMessageSlots);

 	TRACERET2(UTF::EBorder, UTraceModuleEfsrv::EFsConnectReturn, MODULEUID, r, Handle());

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetSessionToPrivate(TInt aDrive)

 /**

 Sets the session path to point to the private path on the specified drive.

 The private directory does not need to exist at this point.

 The private path for a process has the form: \\Private\\13579BDF\\

 where 13579BDF is the identity of the process.

 @param aDrive The drive for which information is requested.

               Specify a drive in the range EDriveA to EDriveZ for drives

 			  A to Z respectively.

 @return KErrNone, if successful, otherwise one of the other system-wide

         error codes.

 */

 	{	

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsSetSessionToPrivate, MODULEUID, Handle(), aDrive);

 	TInt r = SendReceive(EFsSessionToPrivate,TIpcArgs(aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetSessionToPrivateReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::PrivatePath(TDes& aPath)

 /**

 Creates the text defining the private path for a process.

 The private path for a process has the form: \\Private\\13579BDF\\

 where 13579BDF is the identity of the process.

 @param aPath On successful return, contains the private path for a process.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsPrivatePath, MODULEUID, Handle());

 	TInt r = SendReceive(EFsPrivatePath,TIpcArgs(&aPath));

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsPrivatePathReturn, MODULEUID, r, aPath);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::CreatePrivatePath(TInt aDrive)

 /**

 Creates the private path for a process on the specified drive.

 The private path for a process has the form: \\Private\\13579BDF\\

 where 13579BDF is the identity of the process.

 @param aDrive The drive for which the private path is to be created.

               Specify a drive in the range EDriveA to EDriveZ for drives

 			  A to Z respectively.

 @return KErrNone, if successful, otherwise one of the other system-wide

         error codes.

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsCreatePrivatePath, MODULEUID, Handle(), aDrive);

 	TInt r = SendReceive(EFsCreatePrivatePath,TIpcArgs(aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsCreatePrivatePathReturn, MODULEUID, r);

 	return r;

 	}	

 EFSRV_EXPORT_C TVersion RFs::Version() const

 /**

 Gets the client side version number.

 @return The client side version number.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsVersion, MODULEUID, Handle());

 	TVersion r = TVersion(KF32MajorVersionNumber,KF32MinorVersionNumber,KF32BuildVersionNumber);

 	TRACERET3(UTF::EBorder, UTraceModuleEfsrv::EFsVersionReturn, MODULEUID, r.iMajor, r.iMinor, r.iBuild);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::AddFileSystem(const TDesC& aFileName) const

 /**

 Adds a file system to the file server.

 After calling this function, use MountFileSystem() to mount the file system

 on a drive.

 @param aFileName The name of the file system .FSY to install. Its full path can

 				 be specified.

 @return KErrNone, if successful, otherwise one of the other system-wide

         error codes.

 @capability DiskAdmin

 @see RFs::MountFileSystem        

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsAddFileSystem, MODULEUID, Handle(), aFileName);

 	RLoader loader;

 	TInt r = loader.Connect();

 	if (r==KErrNone)

 		{

 		r = loader.SendReceive(ELoadFileSystem, TIpcArgs(0, &aFileName, 0));

 		loader.Close();

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsAddFileSystemReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::RemoveFileSystem(const TDesC& aFileSystemName) const

 /**

 Removes the specified file system.

 @param aFileSystemName The fullname of the file system, as returned from

                        a call to FileSystemName(), to be removed.

 @return KErrNone, if successful;

         KErrNotFound, if aFileSystemName is not found;

         otrherwise one of the other system-wide error codes.

 @capability DiskAdmin

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsRemoveFileSystem, MODULEUID, Handle(), aFileSystemName);

 	TInt r = SendReceive(EFsRemoveFileSystem,TIpcArgs(&aFileSystemName));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsRemoveFileSystemReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystem(const TDesC& aFileSystemName,TInt aDrive) const

 /**

 Mounts a file system on a drive.

 The file system must first have been added to the file server using AddFileSystem().

 The drive is mounted as asynchronous, i.e operations on it don't block the file server and other drives;

 @param aFileSystemName The fullname of the file system, as returned from  a call to FileSystemName().

 @param aDrive          The drive on which the file system is to be mounted; this can be one of the values defined by TDriveNumber.

 @return KErrNone if successful, otherwise one of the other system-wide error codes.

 @capability DiskAdmin

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem1, MODULEUID, Handle(), aFileSystemName, aDrive);

 	TInt r = SendReceive(EFsMountFileSystem,TIpcArgs(&aFileSystemName,aDrive,NULL,EFalse));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem1Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystem(const TDesC& aFileSystemName,TInt aDrive, TBool aIsSync) const

 /**

 Mounts a file system on a specified drive.

 The file system must first have been added to the file server using AddFileSystem().

 Depending on the aIsSync parameter, the drive can be mounted as synchronous or asynchronous.

 Asynchronous drive has its own processing thread, i.e operations on it don't block the file server and other drives;

 Synchronous drives' requests are being processed by the main file server thread and there is a possibility to block it along with

 all operations on other drives. Mounting a drive as synch. makes a sense if the operations on such drive are very fast e.g. this is an

 internal RAM or ROFS drive.

 @param aFileSystemName The fullname of the file system, as returned from a call to FileSystemName().

 @param aDrive          The drive number on which the file system is to be mounted; this can be one of the values defined by TDriveNumber.

 @param aIsSync         if ETrue  the drive will be mounted as synchronous one;

                        if EFalse the drive will be mounted as Asynchronous.

 @return KErrNone if successful, otherwise one of the other system-wide error codes.

 @capability DiskAdmin

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem2, MODULEUID, Handle(), aFileSystemName, aDrive, aIsSync);

 	TInt r = SendReceive(EFsMountFileSystem,TIpcArgs(&aFileSystemName,aDrive,NULL,aIsSync));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem2Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystem(const TDesC& aFileSystemName,const TDesC& aExtensionName,TInt aDrive)

 /**

 Mounts a file system on a drive, and the specified extension.

 The file system must first have been added to the file server using AddFileSystem().

 The drive is mounted as asynchronous, i.e operations on it don't block the file server and other drives;

 @param aFileSystemName The fullname of the file system, as returned from a call to FileSystemName().

 @param aExtensionName  The filename of the extension.

 @param aDrive          The drive on which the file system is to be mounted; this can be one of the values defined by TDriveNumber.

 @return KErrNone if successful, otherwise one of the other system-wide error codes.

 @capability DiskAdmin

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem3, MODULEUID, Handle(), aFileSystemName, aExtensionName, aDrive);

 	TInt r = SendReceive(EFsMountFileSystem,TIpcArgs(&aFileSystemName,aDrive,&aExtensionName,EFalse));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem3Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystem(const TDesC& aFileSystemName,const TDesC& aExtensionName,TInt aDrive, TBool aIsSync)

 /**

 Mounts a file system on a drive, and the specified extension.

 The file system must first have been added to the file server using AddFileSystem().

 Depending on the aIsSync parameter, the drive can be mounted as synchronous or asynchronous.

 Asynchronous drive has its own processing thread, i.e operations on it don't block the file server and other drives;

 Synchronous drives' requests are being processed by the main file server thread and there is a possibility to block it along with

 all operations on other drives. Mounting a drive as synch. makes  sense if the operations on such drive are very fast e.g. this is an

 internal RAM or ROFS drive.

 @param aFileSystemName The fullname of the file system, as returned from a call to FileSystemName().

 @param aExtensionName  The filename of the extension.

 @param aDrive          The drive on which the file system is to be mounted; this can be one of the values defined by TDriveNumber.

 @param aIsSync         if ETrue  the drive will be mounted as synchronous one;

                        if EFalse the drive will be mounted as Asynchronous.

 @return KErrNone if successful, otherwise one of the other system-wide error codes.

 @capability DiskAdmin

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT5(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem4, MODULEUID, Handle(), aFileSystemName, aExtensionName, aDrive, aIsSync);

 	TInt r = SendReceive(EFsMountFileSystem,TIpcArgs(&aFileSystemName,aDrive,&aExtensionName,aIsSync));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystem4Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystemAndScan(const TDesC& aFileSystemName,TInt aDrive,TBool& aIsMountSuccess) const

 /**

 Mounts a file system on a drive, and performs a scan on that drive.

 The file system must first have been added to the file server using AddFileSystem().

 Note that the scan is done only if the mount is successful.

 The drive is mounted as asynchronous, i.e operations on it don't block the file server and other drives;

 @param aFileSystemName The fullname of the file system, as returned from a call to FileSystemName().

 @param aDrive          The drive on which the file system is to be mounted; this can be one of the values defined by TDriveNumber.

 @param aIsMountSuccess On return, set to: ETrue, if the  if the mount is successful, set to EFalse otherwise.

 @return KErrNone if successful, otherwise one of the other system-wide error codes, reflecting the failure of the mount operation. 

 @capability DiskAdmin

 @see RFs::TDriveNumber

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystemAndScan1, MODULEUID, Handle(), aFileSystemName, aDrive);

 	aIsMountSuccess=EFalse;

 	TPckg<TInt> pckg(aIsMountSuccess);

 	TInt r = SendReceive(EFsMountFileSystemScan,TIpcArgs(&aFileSystemName,aDrive,NULL,&pckg));

 	TRACERET2(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystemAndScan1Return, MODULEUID, r, aIsMountSuccess);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountFileSystemAndScan(const TDesC& aFileSystemName,const TDesC& aExtensionName,TInt aDrive,TBool& aIsMountSuccess) const

 /**

 Mounts a file system on a drive, and the specified extension and performs a scan on that drive.

 The file system must first have been added to the file server,

 using AddFileSystem().

 Note that the scan is done only if the mount is successful.

 The operation is asynchronous, i.e other concurrent file server operations can continue.

 @param aFileSystemName The fullname of the file system, as returned from

                        a call to FileSystemName().

 @param aExtensionName  The filename of the extension.

 @param aDrive          The drive on which the file system is to be mounted;

                        this can be one of the values defined by TDriveNumber.

 @param aIsMountSuccess On return, set to: ETrue, if the  if the mount

                        is successful, set to EFalse otherwise.

 @return KErrNone if successful, otherwise one of the other system-wide

         error codes, reflecting the failure of the mount operation. 

 @capability DiskAdmin

 @see RFs::TDriveNumber

 @see RFs::AddFileSystem

 @see RFs::FileSystemName

 */

 	{

 	TRACEMULT5(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystemAndScan2, MODULEUID, 

 		Handle(), aFileSystemName, aExtensionName, aDrive, aIsMountSuccess);

 	aIsMountSuccess=EFalse;

 	TPckg<TInt> pckg(aIsMountSuccess);

 	TInt r = SendReceive(EFsMountFileSystemScan,TIpcArgs(&aFileSystemName,aDrive,&aExtensionName,&pckg));

 	TRACERET2(UTF::EBorder, UTraceModuleEfsrv::EFsMountFileSystemAndScan2Return, MODULEUID, r, aIsMountSuccess);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::DismountFileSystem(const TDesC& aFileSystemName,TInt aDrive) const

 /**

 Dismounts the file system from the specified drive.

 @param aFileSystemName The fullname of the file system, as returned from

                        a call to FileSystemName().

 @param aDrive          The drive from which the file system is to be dismounted.

 @return KErrNone, if successful;

         KErrNotFound, if aFileSystemName is not found;

         KErrNotReady, if the drive does not have a file	system mounted on it;

         KErrInUse, if the drive has a resource open	on it;

         KErrAccessDenied, if there is an attempt to dismount a ROM file system,

         a substituted drive, or the drive which is the default drive;

  		KErrArgument, if the specified drive value is outsdide of the valid range.

  		KErrPermissionDenied, if the client does not have the necessary capabilities 

  		to dismount the file system. 		

 @capability DiskAdmin

 @see RFs::FileSystemName 		

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsDismountFileSystem, MODULEUID, Handle(), aFileSystemName, aDrive);

 	TInt r = SendReceive(EFsDismountFileSystem,TIpcArgs(&aFileSystemName,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsDismountFileSystemReturn, MODULEUID, r);

 	return r;

 	}

 /**

     Gets the name of the file system mounted on the specified drive.

     The function can be called before calling DismountFileSystem().

     @param aName  On successful return, contains the name of the file system.

     @param aDrive The drive for which the file system name is required.

     Note that the file system name, returned in the aName descriptor shall be threated as case-insensitive string. I.e. 

     "fileSystem" and "FILESYSTEM" mean absolutely the same. Therefore, case-insensitive string methods (like TDesC::FindF(), TDesC::CompareF())

     shall be used to deal with the names.

     @return KErrNone, if successful;

             KErrNotFound if aFileSystemName is not found, or the drive does not have a file	system mounted on it;

             KErrArgument, if the drive value is outside the valid range, i.e. zero to KMaxDrives-1 inclusive.

     @see RFs::DismountFileSystem				

 */

 EFSRV_EXPORT_C TInt RFs::FileSystemName(TDes& aName,TInt aDrive) const

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsFileSystemName, MODULEUID, Handle(), aDrive);

 	//-- ipc argument "-1" here is to indicate legacy FileSystemName() API

     TInt r = SendReceive(EFsFileSystemName,TIpcArgs(&aName, aDrive, -1)); 

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsFileSystemNameReturn, MODULEUID, r, aName);

 	return r;

 	}

 /**

     Get one of the supported file system names on a specified drive. This API can be used for enumerating 

     file systems that can be recognised and mounted automatically, without user's interaction. 

     If the automatic recognition and mountng some known file systems is supported on the specified drive, there 

     shall be at least 2 names in the list. For example "FAT" and "exFAT". 

     If "automatic file system recognising" feature is not supported, the list will consist of just one name, and 

     this will be the name returned by RFs::FileSystemName() API.

     Note that the file system name, returned in the aName descriptor shall be threated as case-insensitive string. I.e. 

     "fileSystem" and "FILESYSTEM" mean absolutely the same. Therefore, case-insensitive string methods (like TDesC::FindF(), TDesC::CompareF())

     shall be used to deal with the names.

     @param  aName           On successful return, contains the name of the file system that correspond to the aFsEnumerator value.

     m@param aDrive          The drive number 

     @param  aFsEnumerator   The supported file system enumerator. can be:

                             KRootFileSystem a special value; in this case the returned name will be the same as obtained by FileSystemName()

                             0,1,2... integer values specifying the sequential number of supported filesystem. See the return error code.

     @return KErrNone        success, aName contains a valid name for the supported file system number "aFsEnumerator" on this drive.

             KErrNotFound    the end of the supported file names list; "aFsEnumerator-1" was the last correct value

             KErrArgument    incorrect arguments

     @see FileSystemName()

     @see KRootFileSystem   

 */

 EFSRV_EXPORT_C TInt RFs::SupportedFileSystemName(TDes& aName, TInt aDrive, TInt aFsEnumerator) const

     {

 	if(aFsEnumerator < 0)

         return KErrArgument; //-- see RFs::FileSystemName(). "-1" is a reserved value

     TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsFileSystemName, MODULEUID, Handle(), aDrive);

     TInt r = SendReceive(EFsFileSystemName,TIpcArgs(&aName, aDrive, aFsEnumerator));

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsFileSystemNameReturn, MODULEUID, r, aName);

 	return r;

     }

 EFSRV_EXPORT_C TInt RFs::AddExtension(const TDesC& aFileName)

 /**

 Loads the specified extension.

 @param aFileName The file name of the extension

 @return KErrNone, if successful; otherwise one of the other system wide error codes.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsAddExtension, MODULEUID, Handle(), aFileName);

 	RLoader loader;

 	TInt r = loader.Connect();

 	if (r==KErrNone)

 		{

 		r = loader.SendReceive(ELoadFSExtension, TIpcArgs(0, &aFileName, 0));

 		loader.Close();

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsAddExtensionReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::MountExtension(const TDesC& aExtensionName,TInt aDrive)

 /**

 Mounts the the specified extension.

 The extension must first have been loaded using AddExtension().

 @param aExtensionName  The fullname of the extension, as returned from

                        a call to ExtensionName().

 @param aDrive          The drive on which the extension is to be mounted;

 @return KErrNone if successful;

         KErrNotFound, if the extension cannot be found;

         otherwise one of the other system-wide error codes.

 @see RFs::ExtensionName

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsMountExtension, MODULEUID, Handle(), aExtensionName, aDrive);

 	TInt r = SendReceive(EFsMountExtension,TIpcArgs(&aExtensionName,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMountExtensionReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Dismounts the specified extension.

 @param aExtensionName  The fullname of the extension, as returned from a call to ExtensionName().

 @param aDrive          The drive this extension is to be dismounted from.

 @return KErrNone if successful;

         KErrNotFound    if the extension cannot be found;

         otherwise one of the other system-wide error codes.

 @see RFs::ExtensionName

 */

 EFSRV_EXPORT_C TInt RFs::DismountExtension(const TDesC& aExtensionName,TInt aDrive)

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsDismountExtension, MODULEUID, Handle(), aExtensionName, aDrive);

 	TInt r = SendReceive(EFsDismountExtension,TIpcArgs(&aExtensionName,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsDismountExtensionReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::RemoveExtension(const TDesC& aExtensionName)

 /**

 Removes the specified extension.

 @param aExtensionName The fullname of the extension, as returned from

                       a call to ExtensionName().

 @return KErrNone, if successful;

         KErrNotFound, if aExtensionName is not found;

         otrherwise one of the other system-wide error codes.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsRemoveExtension, MODULEUID, Handle(), aExtensionName);

 	TInt r = SendReceive(EFsRemoveExtension,TIpcArgs(&aExtensionName));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsRemoveExtensionReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::ExtensionName(TDes& aExtensionName,TInt aDrive,TInt aPos)

 /**

 Gets the name of the extension on the specified drive at the specified position

 in the extension hierarchy.

 @param aExtensionName  On successful return, contains the name of the extension.

 @param aDrive          The drive for which the extension name is required.

 @param aPos            The position of the extension in the extension hierarchy.

 @return KErrNone, if successful;

         KErrNotFound if the extension name is not found;

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsExtensionName, MODULEUID, Handle(), aExtensionName, aDrive, aPos);

 	TInt r = SendReceive(EFsExtensionName,TIpcArgs(&aExtensionName,aDrive,aPos));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsExtensionNameReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::RemountDrive(TInt aDrive,const TDesC8* aMountInfo,TUint aFlags)

 /**

 Forces a remount of the specified drive.

 @param aDrive     The drive for which a remount is to be forced.

 @param aMountInfo Information passed down to the media driver. The meaning of

                   this information depends on the media driver, for example,

                   keys for secure areas.

 @param aFlags     When the flag is set to

                   0x00000001 - Used to simulate ejecting and re-inserting the media.

                   0x80000000 - used to force the media driver for the specified logical

                                drive to be closed and reopened.

 @return KErrNone if successful, otherwise one of

         the other system wide error codes.

 */

 	{

 	TRACE4(UTF::EBorder, UTraceModuleEfsrv::EFsRemountDrive, MODULEUID, Handle(), aDrive, aMountInfo, aFlags);

 	TInt r = SendReceive(EFsRemountDrive,TIpcArgs(aDrive,aMountInfo,aFlags));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsRemountDriveReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C void RFs::NotifyChange(TNotifyType aType,TRequestStatus& aStat)

 /**

 Requests a notification of change to files or directories.

 Changes are notified either:

 1. following any change in the file system

 or

 2. only following the addition or deletion of a directory entry, or after

    a disk has been formatted or changed.

 Such notification is useful for programs that maintain displays

 of file lists which must be dynamically updated. The alternative is to do

 no updating, or to perform periodic monitoring for change, which

 is inefficient.

 This is an asynchronous request and, as such, results in precisely one signal

 to the request status passed as a parameter. To avoid missing any change, this

 request should be issued before the first file list is constructed. When

 the request completes, a new request should be issued before the next file

 list is constructed. When the file server session is

 closed, this request is implicitly cancelled.

 Call NotifyChangeCancel() to explicitly cancel a notification request.

 @param aType Indicates the kind of change that should result in notification.

 			 For example:

 			 ENotifyEntry causes notification only when an entry is added or

              deleted, or when a disk is formatted or changed;

              ENotifyAll causes notification following any type of change, such

              as when a file is written to, or when a file's attributes

              are changed.

 @param aStat The request status.

              This is set to KErrNone on completion, otherwise one of the other

              system-wide error codes.

 */

 	{

 	TRACE3(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChange1, MODULEUID, Handle(), aType, &aStat);

 	aStat=KRequestPending;

 	// for backward compatibility

 	TNotifyType type = (aType == 0 ? ENotifyEntry : aType);

 	RSessionBase::SendReceive(EFsNotifyChange, TIpcArgs(type,&aStat) , aStat );

 	//This call is to synchronise with the file server when this functions stack varibles can go out of scope

 	SendReceive(EFsSynchroniseDriveThread, TIpcArgs(-1));		

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChange1Return, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyChange(TNotifyType aType,TRequestStatus& aStat,const TDesC& aPathName)

 /**

 Requests a notification of change to files or directories, allowing

 a directory/file path to be specified.

 Changes are notified either:

 1. following any change in the file system

 or

 2. only following the addition or deletion of a directory entry, or after

    a disk has been formatted or changed.

 Such notification is useful for programs that maintain displays

 of file lists which must be dynamically updated. The alternative is to do

 no updating, or to perform periodic monitoring for change, which

 is inefficient.

 This is an asynchronous request and, as such, results in precisely one signal

 to the request status passed as a parameter. To avoid missing any change, this

 request should be issued before the first file list is constructed. When

 the request completes, a new request should be issued before the next file

 list is constructed. When the file server session is

 closed, this request is implicitly cancelled.

 Call NotifyChangeCancel() to explicitly cancel a notification request.

 @param aType     Indicates the kind of change that should result in

                  notification. For example:

 			     ENotifyEntry causes notification only when an entry is added

 			     or deleted, or when a disk is formatted or changed;

                  ENotifyAll causes notification following any type of change,

                  such as when a file is written to, or when a file's attributes

                  are changed.

 @param aStat     The request status.

                  This is set to KErrNone on completion, otherwise one of

                  the other system-wide error codes.

 @param aPathName The directory or file for which notification is required. By

                  specifying a drive as a wildcard, for example

                  "?:\\Resource\\apps\\", or

 				 "*:\\Resource\\apps\\", a client can ask to be notified of changes

 				 to a given directory on any drive.

 				 As with all directory paths aPathName must be terminated with '\\',

 				 Please refer to "Structure of paths and filenames" section in the

 				 Symbian OS Library.

 @capability Dependent If aName is /Sys then AllFiles capability is required.

 @capability Dependent If aName begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChange2, MODULEUID, Handle(), (TUint) aType, (TUint) &aStat, aPathName);

 	aStat=KRequestPending;

 	// for backward compatibility

 	TNotifyType type = (aType == 0 ? ENotifyEntry : aType);

 	RSessionBase::SendReceive(EFsNotifyChangeEx,TIpcArgs(type,&aPathName,&aStat),aStat);

 	//This call is to synchronise with the file server when this functions stack varibles can go out of scope

 	SendReceive(EFsSynchroniseDriveThread, TIpcArgs(-1));

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChange2Return, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyChangeCancel()

 /**

 Cancels all outstanding requests for notification of change

 to files or directories.

 All outstanding requests complete with KErrCancel.

 Note that this is a synchronous function.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChangeCancel1, MODULEUID, Handle());

 	RSessionBase::SendReceive(EFsNotifyChangeCancel);

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChangeCancel1Return, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyChangeCancel(TRequestStatus& aStat)

 /**

 Cancels the specific request for notification of change

 to files or directories.

 The outstanding request completes with KErrCancel.

 Note that this is an asynchronous function.

 @param aStat The request status object associated with the request

              to be cancelled. Note that the function does not change

              this parameter.

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChangeCancel2, MODULEUID, Handle(), &aStat);

 	if (aStat==KRequestPending)			//	May be better to ASSERT this?

 		SendReceive(EFsNotifyChangeCancelEx,TIpcArgs(&aStat));

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyChangeCancel2Return, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyDiskSpace(TInt64 aThreshold,TInt aDrive,TRequestStatus& aStat)

 /**

 Requests notification when the free disk space on the specified

 drive crosses the specified threshold value.

 The threshold is crossed if free disk space increases to a value above

 the threshold value or decreases to a value below the threshold value.

 This is an asynchronous request that completes if any of the

 following events occur:

 1. the threshold is crossed 

 2. any drive is formatted 

 3. there is a media change on any socket 

 4. power up 

 5. the scandrive utility is run on any drive

 5. the specified threshold value is outside its limits 

 7. the outstanding request is cancelled. 

 Note that free disk space notification is not supported for

 drives using remote file systems.

 @param aThreshold The threshold value. This must be greater than zero and less

                   than the total size of the disk.

 @param aDrive     The drive number. This is an explicit drive defined by one of

 				  the TDriveNumber enum values or the value

 				  KDefaultDrive. If KDefaultDrive is specified, then

                   the drive monitored is the session path drive.

 @param aStat      The request status object. On request completion, contains:

 				  KErrNone, if the threshold value is crossed, if any drive is

                   formatted, if there is a media change on any socket, if there is a power up or

 				  if the scandrive utility is run on any drive;

 				  KErrCancel, if the outstanding request is cancelled by a call to

                   NotifyDiskSpaceCancel();

                   KErrArgument, if the threshold value is outside its limits.

 @see TDriveNumber

 */

 	{

 	TRACE5(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpace, MODULEUID, 

 		Handle(), I64LOW(aThreshold),I64HIGH(aThreshold), aDrive,(TUint) &aStat);

 	aStat=KRequestPending;

 	TPtrC8 tBuf((TUint8*)&aThreshold,sizeof(TInt64));

 	RSessionBase::SendReceive(EFsNotifyDiskSpace,TIpcArgs(&tBuf,aDrive,&aStat), aStat);

 	//This call is to synchronise with the driver thread as corresponding cancel function (NotifyDiskSpaceCancel)

 	//is synchronous, so it can complete before this notify request has even been added to TDiskSpaceQue.

 	//This call guarantees that the notify request has been added to queue.

 	SendReceive(EFsSynchroniseDriveThread, TIpcArgs(aDrive));

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpaceReturn, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyDiskSpaceCancel(TRequestStatus& aStat)

 /**

 Cancels a specific outstanding request for free disk space

 notification.

 The outstanding request completes with KErrCancel.

 @param aStat The request status object identified with the original

 			 notification request.

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpaceCancel1, MODULEUID, Handle(), &aStat);

 	if(aStat==KRequestPending)

 		SendReceive(EFsNotifyDiskSpaceCancel,TIpcArgs(&aStat));

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpaceCancel1Return, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::NotifyDiskSpaceCancel()

 /**

 Cancels all outstanding requests for free disk space

 notification.

 Outstanding requests complete with KErrCancel.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpaceCancel2, MODULEUID, Handle());

 	SendReceive(EFsNotifyDiskSpaceCancel,TIpcArgs(NULL));

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsNotifyDiskSpaceCancel2Return, MODULEUID);

 	}

 EFSRV_EXPORT_C TInt RFs::DriveList(TDriveList& aList) const

 /**

 Gets a list of the available (not remote and non hidden) drives.

 The drive list consists of an array of 26 bytes. Array index zero corresponds

 to drive A, index one equals B etc.

 Each byte with a non zero value signifies that the corresponding drive is available

 to the system. In the case of removable media, RFs::Drive should be used to determine

 whether the media is inserted or not.

 The local file system always reserves drive letters A through I.

 Drive letter Z is always used for the ROM which means that letters J through Y

 are available to be used by SetSubst() or for redirecting.				

 @param aList On return, contains a list of drive attributes (only the first 8 bits) for the available non-remote and non-hidden drives.

 @return KErrNone, successful, otherwise one of the other system-wide error codes.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsDriveList1, MODULEUID, Handle());

 	TInt r = SendReceive(EFsDriveList,TIpcArgs(&aList, KDriveAttExclude|KDriveAttRemote|KDriveAttHidden));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsDriveList1Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::DriveList(TDriveList& aList, TUint aFlags) const

 /**

 Gets a list of the available drives that match a combination of drive attributes,specified in aFlags.

 This combination may include,exclude or exclusively specify the attributes that that drives to be returned 

 should match.

 The drive list consists of an array of 26 bytes. Array index zero corresponds

 to drive A, index one equals B etc.

 Each byte with a non zero value signifies that the corresponding drive is available

 to the system. In the case of removable media, RFs::Drive should be used to determine

 whether the media is inserted or not.

 The local file system always reserves drive letters A through I.

 Drive letter Z is always used for the ROM which means that letters J through Y

 are available to be used by SetSubst() or for redirecting.				

 @param aList On return, contains a list of available drives that qualify aFlags.

 @param aFlags A combination of drive attributes that drives to be returned must qualify. 

 @return KErrNone, successful, otherwise one of the other system-wide error codes;

 		KErrArgument, If aFlags contains an invalid attribute combination.

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsDriveList2, MODULEUID, Handle(), aFlags);

 	TInt r = SendReceive(EFsDriveList,TIpcArgs(&aList,aFlags));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsDriveList2Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Drive(TDriveInfo& anInfo,TInt aDrive) const

 /**

 Gets information about a drive and the medium mounted on it.

 Note that Volume() can also be used to give information about the drive and

 the volume mounted on it. These two functions are separate because, while

 the characteristics of a drive cannot change, those of a

 volume can, by mounting different media, reformatting etc.

 @param anInfo On return, contains information describing the drive

 			  and the medium mounted on it. The value of TDriveInfo::iType

 			  shows whether the drive contains media.

 @param aDrive The drive for which information is requested.

               Specify KDefaultDrive for the session default drive.

 			  Specify a drive in the range EDriveA to EDriveZ for drives

 			  A to Z respectively.

 @return       KErrNone, if successful, otherwise one of the other

               system-wide error codes.

 @see RFs::Volume

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsDrive, MODULEUID, Handle(), aDrive);

 	TPckg<TDriveInfo> m(anInfo);

 	TInt r = SendReceive(EFsDrive,TIpcArgs(&m,aDrive));

 	TRACERET4(UTF::EBorder, UTraceModuleEfsrv::EFsDriveReturn, MODULEUID, r, anInfo.iDriveAtt, anInfo.iMediaAtt, anInfo.iType);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Volume(TVolumeInfo& aVol,TInt aDrive) const

 /**

 Gets volume information for a formatted device.

 This function provides additional information to that given by Drive(),

 including the volume label, if set, and the amount of free space on the

 disk.

 Note, use Drive() to get information about the drive without reference to

 a volume. These two functions are separate because, while the characteristics

 of a drive cannot change, those of a volume can, by mounting different media,

 reformatting etc. A volume may not even be present if the media is removable.

 @param aVol   On return, contains the volume information.

 @param aDrive The drive which contains the media for which volume information is to be displayed.

               Specify a drive in the range EDriveA to EDriveZ for drives A to Z respectively. 

               The default drive is the session default drive KDefaultDrive.

 @return KErrNone, if successful;

         KErrNotReady, if the drive contains no media;

         otherwise one of the other system-wide error codes.

 @see RFs::Drive

 */

 	{

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsVolume1, MODULEUID, Handle(), aDrive);

 	TPckg<TVolumeInfo> v(aVol);

     TInt r = SendReceive(EFsVolume,TIpcArgs(&v,aDrive,NULL));

 	TRACE7(UTF::EBorder, UTraceModuleEfsrv::EFsVolume1Return, MODULEUID, 

 		r, aVol.iUniqueID, I64LOW(aVol.iSize), I64HIGH(aVol.iSize),

 		I64LOW(aVol.iFree), I64HIGH(aVol.iFree), aVol.iFileCacheFlags);

 	return r;

 	}

 /**

 Gets volume information for a formatted device asynchronously.

 @see TInt RFs::Volume(TVolumeInfo& aVol,TInt aDrive) for the synchronous version.

 "Asynchronously" corresponds to the amount of free space on the volume in TVolumeInfo::iFree.

 I.e. this function returns the _current_ amount of free space on the volume, which can be changing due to some

 filesystems' activities. For example, some filesystems can be performing free space calculations in the background. 

 Comparing to the RFs::Volume(TVolumeInfo& aVol,TInt aDrive), this method doesn't block the client until background filesystem 

 activity finishes, which can be useful in some situations. 

 @param aVol   On return, contains the volume information with the _current_ value in the TVolumeInfo::iFree.

 @param aDrive Drive number to query. Specify a drive in the range EDriveA to EDriveZ for drives A to Z respectively. 

 @param aStat  request status. At present is used just for indication of the asynchronous version and gets immediately completed, so there is no reason to analyse its value.                                                                                                                      

 @publishedPartner

 @prototype

 */

 EFSRV_EXPORT_C void RFs::Volume(TVolumeInfo& aVol,TInt aDrive, TRequestStatus& aStat) const

     {

 	TRACE3(UTF::EBorder, UTraceModuleEfsrv::EFsVolume2, MODULEUID, Handle(), aDrive, &aStat);

 	TPckg<TVolumeInfo> v(aVol);

     aStat=KRequestPending;

     RSessionBase::SendReceive(EFsVolume,TIpcArgs(&v,aDrive,&aStat), aStat);

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsVolume2Return, MODULEUID);

     }

 EFSRV_EXPORT_C TInt RFs::SetVolumeLabel(const TDesC& aName,TInt aDrive)

 /**

 Sets the label for a volume.

 Note that similar to file names, volume labels can be set with unicode characters.

 However it may not be recognized properly if correct code page is not

 loaded or it is mounted onto a system that does not support DBCS volume

 labels

 @param aName  The volume label.

 @param aDrive The drive containing the media whose label is to be set.

 	          Specify a drive in the range EDriveA to EDriveZ for

 			  drives A to Z.

               The default drive is the session default drive KDefaultDrive.

 @return KErrNone, if successful;

         KErrNotReady, if the drive contains no media;

         otherwise one of the other system-wide error codes.

 @capability DiskAdmin

 @see TDriveNumber

 @see TVolumeInfo::iName

 @see RFs::Volume

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsSetVolumeLabel, MODULEUID, 

 		Handle(), aName, aDrive);

 	TInt r = SendReceive(EFsSetVolume,TIpcArgs(&aName,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetVolumeLabelReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Subst(TDes& aPath,TInt aDrive) const

 /**

 Gets the path assigned to a drive letter by an earlier call to SetSubst().

 To find out whether a drive letter has been substituted, first get the drive

 information, using Drive(), and then test the value of the KDriveAttSubsted bit

 provided by TDriveInfo::iDriveAtt.

 @param aPath  On return, contains the path which has been assigned to the

               drive. If the drive letter has not been substituted, this argument

               returns an empty descriptor.

 @param aDrive The drive which is the subject of the enquiry. Specify a number

 			  in the range 0 (EDriveA) to 25 (>EDriveZ) for drives

 			  A to Z. The default drive is the session default

               drive KDefaultDrive.

 @return KErrNone, if successful, otherwise one of the other

         system-wide error codes.

 @see RFs::SetSubst

 @see TDriveInfo

 @see RFs::Drive

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsSubst, MODULEUID, Handle(), aPath, aDrive);

 	TInt r = SendReceive(EFsSubst,TIpcArgs(&aPath,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSubstReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetSubst(const TDesC& aPath,TInt aDrive)

 /**

 Assigns a path to a drive letter.

 Whenever that drive letter is used, it will be translated into a reference

 to the path specified here. To	clear a drive substitution, specify an empty

 descriptor for aPath. 

 Note that the substituted path is text-only. Its components need not

 be syntactically correct, nor must they be valid at the time the substitution

 is set. Any component may be deleted, removed or unmounted while the

 substitution is set.

 @param aPath  The path to be assigned to the drive letter. If a drive letter

 			  is specified in the path, it must not itself be substituted or

 			  redirected, or the function will return an error. If no drive is

 			  specified, the drive contained in the default session path is

 			  used, and if no path is specified, the default session path is

 			  used. If a filename or extension is included in the  path,

 			  the function will return an error. Therefore, the final component

 			  in the path must have a trailing backslash to indicate that it is

 			  a directory.

 @param aDrive The drive to which a path is to be assigned. Specify a number

 			  in the range 0 (EDriveA) to 25 (EDriveZ) for drives

 			  A to Z. Must not be local, ROM, or redirected, otherwise an

               error is returned. May be substituted, but only if the function

               is being used	to clear the substitution. If the same drive is

               specified in the path, the function will return an error.

               The default drive is the session default drive

 			  KDefaultDrive.

 @return KErrNone, if successful; otherwise one of the other	system-wide

         error codes.

 @capability DiskAdmin

 @capability Dependent If aPath is /Sys then Tcb capability is required.

 @capability Dependent If aPath begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 @capability Dependent If aPath is /Resource then Tcb capability is required.

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsSetSubst, MODULEUID, Handle(), aPath, aDrive);

 	TInt r = SendReceive(EFsSetSubst,TIpcArgs(&aPath,aDrive));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetSubstReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::RealName(const TDesC& aName,TDes& aResult) const

 /**

 Gets the real name of a file.

 This is used in circumstances where a file system needs to

 mangle Symbian OS natural names so that it can store them on that file

 system.

 @param aName   Contains the name by which the file is normally referred.

 @param aResult On return, contains the real name of the file, comprising the

                full path, including the drive letter.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aName is /Sys then AllFiles capability is required.

 @capability Dependent If aName begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsRealName, MODULEUID, Handle(), aName);

 	TInt r = SendReceive(EFsRealName,TIpcArgs(&aName,&aResult));

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsRealNameReturn, MODULEUID, r, aResult);

 	return r;

 	}

 /**

 Gets the serial number of media.

 Only local drive is allowed. Substed drive number will return KErrNotSupported.

 @param aSerialNum Contains serial number on successful return.

 @param aDrive     Drive number.

 @return KErrNone            if successful;

         KErrNotSupported    if media doesn't support serial number (e.g. substed drives);

         KErrBadName         if drive number is invalid;

         otherwise one of system-wide error codes.

 @see TMediaSerialNumber

 */

 EFSRV_EXPORT_C TInt RFs::GetMediaSerialNumber(TMediaSerialNumber& aSerialNum, TInt aDrive)

     {

 	TRACE2(UTF::EBorder, UTraceModuleEfsrv::EFsGetMediaSerialNumber, MODULEUID, Handle(), aDrive);

     TInt r = SendReceive(EFsGetMediaSerialNumber, TIpcArgs(&aSerialNum, aDrive));

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsGetMediaSerialNumberReturn, MODULEUID, r, aSerialNum);

 	return r;

     }

 EFSRV_EXPORT_C TInt RFs::SessionPath(TDes& aPath) const

 /**

 Gets the session path.

 When a client connects to the file server, its session path is initialised to

 the system default path. The session path of an existing client can only be

 changed by this function.

 @param aPath On return, contains the session path, including a trailing

              backslash.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsSessionPath, MODULEUID, Handle());

 	TInt r = SendReceive(EFsSessionPath,TIpcArgs(&aPath));

 	TRACERETMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsSessionPathReturn, MODULEUID, r, aPath);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetSessionPath(const TDesC& aPath)

 /**

 Sets the session path for the current file server client.

 When the client first connects to the file server, its session path

 is initialised to the system default path.

 Note that the session path is text-only. It does not cause any locking.

 Thus, although the path must be syntactically correct, its components

 do not need to be valid at the time the path is set, and any component may be

 deleted, removed or unmounted while the path is set.

 @param aPath The new session path. Consists of a drive and path. Normally, a

              drive should be specified, but if not, the drive specified in

              the existing session path is preserved. If a file is specified,

              then the function fails and returns an error code. Therefore,

              the final component in the path must have a trailing backslash

              to indicate that it is a directory. All components of the

              path must be syntactically correct, for example, wildcard

              characters and double backslashes are not allowed in any

              part of it.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aPath is /Sys then AllFiles capability is required.

 @capability Dependent If aPath begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsSetSessionPath, MODULEUID, Handle(), aPath);

 	TInt r = SendReceive(EFsSetSessionPath,TIpcArgs(&aPath));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetSessionPathReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Makes a directory.

 It should be a sub-directory of an existing	directory and its name should be

 unique within its parent directory, otherwise the function returns error code KErrAlreadyExists.

 Note that if a filename is specified in the argument, it is	ignored.

 Therefore, there should be a trailing backslash after the final

 directory name in the argument to indicate that it is a directory, not a filename. 

 For example, following code will create directory "C:\\DIR1\\"

 @code

 fs.MkDir(_L("C:\\DIR1\\"));

 @endcode

 The last line in the following example will result in KErrAlreadyExists because "DIR2" doesn't have a trailing backslash, 

 therefore is considered as a file name and discarded. Directory "C:\\DIR1\\" has already been created.

 @code

 fs.MkDir(_L("C:\\DIR1\\"));     // shall create DIR1 in the root directory

 fs.MkDir(_L("C:\\DIR1\\DIR2")); // No trailing backslash, fails with KErrAlreadyExists

 @endcode

 This example will always fail because "DIR1" doesn't have a trailing backslash and discarded while the root

 directory always exists. 

 @code

 fs.MkDir(_L("C:\\DIR1"));  // No trailing backslash, will always fail with KErrAlreadyExists

 @endcode

 Note, the following case

 @code

 fs.MkDir(_L("C:\\example.txt\\"));	// would normally create a directory "c:\\example.txt\\" with KErrNone

 @endcode

 But if there is a file named "example.txt", which exists at the same location, KErrAccessDenied is returned.    

 Note also that because this method can return an error code (eg. because

 the disk is full) before checking whether the path already exists, it

 is not appropriate to use it just to work out whether a path exists or not.

 See MkDirAll(), which may also create intermediate directories.

 @param aPath The name of the new directory. Any path components which are

              not specified here will be taken from the session path.

 			 The directory name shall not contain wild cards ('?' or '*' characters) 

 			 and illegal characters like '<', '>', ':', '"', '/', '|' and '\000'.

 			 The directory name containing only whilte space characters 

 			 (See TChar::IsSpace()) is also illegal. 

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes. Even if another error code is returned,

 		(for example, if the disk is full) it is still possible that the 

 		path may already exist.

 @capability Dependent If aPath is /Sys then Tcb capability is required.

 @capability Dependent If aPath begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 @capability Dependent If aPath is /Resource then Tcb capability is required.

 @see RFs::MkDirAll       

 */

 EFSRV_EXPORT_C TInt RFs::MkDir(const TDesC& aPath)

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsMkDir, MODULEUID, Handle(), aPath);

 	TInt r = SendReceive(EFsMkDir,TIpcArgs(&aPath,NULL));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMkDirReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Makes one or more directories.

 Any valid path component specified in aPath which does not already exist is

 created as a directory.

 Note that if a filename is specified in the argument, it is	ignored.

 Therefore, there should be a trailing backslash after the final

 directory name in the argument to indicate that it is a directory, not a

 filename.

 See also notes on RFs::MkDir() about trailing backslashes in directory names.

 Note also that because this method can return an error code (eg. because

 the disk is full) before checking whether the path already exists, it

 is not appropriate to use it just to work out whether a path exists or not.

 See MkDir(), which creates only a single new directory.

 @param aPath The path name specifiying the directory or directories to

              create. If the function completes successfully, this path

              identifies a valid	directory. Any path components which are not

              specified here are taken from the session path.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes. Even if another error code is returned,

 		(for example, if the disk is full) it is still possible that the 

 		path may already exist. 

 @capability Dependent If aPath is /Sys then Tcb capability is required.

 @capability Dependent If aPath begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 @capability Dependent If aPath is /Resource then Tcb capability is required.

 @see RFs::MkDir

 */

 EFSRV_EXPORT_C TInt RFs::MkDirAll(const TDesC& aPath)

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsMkDirAll, MODULEUID, Handle(), aPath);

 	TInt r = SendReceive(EFsMkDir,TIpcArgs(&aPath,TRUE));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsMkDirAllReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::RmDir(const TDesC& aPath)

 /**

 Removes a directory.

 The directory must be empty and cannot be the root directory. 

 Note that if a filename is specified in the argument, it is

 ignored. 

 For example, following code will result in directory "C:\\SRC\\" being removed as long as 

 it is empty, the existance of "ENTRY" will not be checked:

 @code

 fs.RmDir(_L("C:\\SRC\\ENTRY"));

 @endcode

 Similarly, following code will try to remove "C:\\SRC\\" instead of "C:\\SRC\DIR\\":

 @code

 fs.RmDir(_L("C:\\SRC\\DIR"));

 @endcode

 Therefore, there should be a trailing backslash after the final

 directory name in the argument to indicate that it is a directory, not a

 filename.

 See class CFileMan for information on deleting a

 non-empty directory and all of its contents.

 @param aPath The path name of the directory to be removed. Any path	components

              which are not specified here are taken from the session path. Only

              the lowest-level directory identified is removed.

 @return KErrNone, if successful;

         KErrInUse, if trying to remove a non-empty directory or root directory;

         otherwise, one of the other system-wide error codes.

 @capability Dependent If aPath is /Sys then Tcb capability is required.

 @capability Dependent If aPath begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 @capability Dependent If aPath is /Resource then Tcb capability is required.

 @see CFileMan

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsRmDir, MODULEUID, Handle(), aPath);

 	TInt r = SendReceive(EFsRmDir,TIpcArgs(&aPath));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsRmDirReturn, MODULEUID, r);

 	return r;

 	}

 void RFs::GetDirL(const TDesC& aName,const TUidType& aUidType,TUint aKey,CDir*& aFileList,RDir& aDir) const

 //

 // Create a dir array. Leave on any error.

 //

 	{

 	aFileList=NULL;

 	User::LeaveIfError(aDir.Open((RFs& )*this,aName,aUidType));

 	DoGetDirL(aKey,aFileList,aDir);

 	}

 void RFs::GetDirL(const TDesC& aName,TUint anAttMask,TUint aKey,CDir*& aFileList,RDir& aDir) const

 //

 // Create a dir array. Leave on any error.

 //

 	{

 	aFileList=NULL;

 	User::LeaveIfError(aDir.Open((RFs& )*this,aName,anAttMask));

 	DoGetDirL(aKey,aFileList,aDir);

 	}

 void RFs::GetDirL(const TDesC& aName,TUint anAttMask,TUint aKey,CDir*& aFileList,CDir*& aDirList,RDir& aDir) const

 //

 // Create a dir array. Leave on any error.

 //

 	{

 	aDirList=NULL;

 	GetDirL(aName,anAttMask|KEntryAttDir,aKey,aFileList,aDir);

 	aFileList->ExtractL(!(anAttMask&KEntryAttDir),aDirList);

 	}

 void RFs::DoGetDirL(TUint aKey,CDir*& aFileList,RDir& aDir) const

 //

 // Create a dir array. Leave on any error.

 //

 	{

 	aFileList=CDir::NewL();

 	TInt r;

 	TEntryArray* pArray=new(ELeave) TEntryArray;

 	CleanupStack::PushL(pArray);

 	TEntryArray& array=*pArray;

 	do

 		{

 		r=aDir.Read(array);

 		if (r==KErrNone || r==KErrEof)

 			{

 			TInt count=array.Count();

 			if (count==0)

 				break;

 			TInt i=0;

 			while (i<count)

 				aFileList->AddL(array[i++]);

 			}

 		}while (r==KErrNone);

 	CleanupStack::PopAndDestroy();

 	if (!(r==KErrNone || r==KErrEof))

 		User::Leave(r);

 	aFileList->Compress();

 	if (aKey==ESortNone)

 		return;

 	r=aFileList->Sort(aKey);

 	if (r!=KErrNone)

 		User::Leave(r);

 	}

 EFSRV_EXPORT_C TInt RFs::GetDir(const TDesC& aName,const TUidType& aUidType,TUint aKey,CDir*& aFileList) const

 /**

 Gets a filtered list of a directory's contents by UID type.

 The aUidType parameter determines which file entry types should be listed.

 The sort key determines the order in which they are listed.

 Notes:

 1. The function sets aFileList to NULL, and then allocates memory for it before

    appending entries to the list. Therefore, aFileList should have no memory

    allocated to it before this function is called, otherwise this memory

    will become orphaned.

 2. The caller of this function is responsible for deleting aFileList after

    the function has returned.

 @param aName     The name of the directory for which a listing is required.

                  Wildcards may be used to specify particular files.

 @param aUidType  Only those files whose UIDs match those specified within this

                  UID type will be included in the file list. Any, or all, of

                  the three UIDs within the UID type may be omitted.

 				 Any UID which is omitted acts in a similar manner to

 				 a wildcard character, matching to all UIDs.

 @param aKey      The sort key. This is a set of flags indicating the order in

                  which the entries are to be sorted. These flags are defined

                  by TEntryKey.

 @param aFileList On return contains a filtered list of directory and file entries.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @see TEntryKey

 */

 	{

 	TRACEMULT6(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir1, MODULEUID, 

 		Handle(), aName, aUidType[0].iUid, aUidType[1].iUid, aUidType[2].iUid, aKey);

 	RDir d;

 	TRAPD(r,GetDirL(aName,aUidType,aKey,aFileList,d))

 	d.Close();

 	if (r!=KErrNone)

 		{

 		delete aFileList;

 		aFileList=NULL;

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir1Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::GetDir(const TDesC& aName,TUint anAttMask,TUint aKey,CDir*& aFileList) const

 /**

 Gets a filtered list of a directory's contents.

 The	bitmask determines which file and directory entry types should be listed.

 The sort key determines the order in which they are listed.

 Notes:

 1. If sorting by UID (as indicated when the ESortByUid bit is OR'ed with

    the sort key), then UID information will be included in the listing

    whether or not KEntryAttAllowUid is specified in anAttMask.

 2. The function sets aFileList to NULL, and then allocates memory for it before

    appending entries to the list. Therefore, aFileList should have no memory

    allocated to it before this function is called, otherwise this memory will

    become orphaned.

 3. The caller of this function is responsible for deleting aFileList after

    the function has returned.

 @param aName     The name of the directory for which a listing is required.

                  Wildcards may be used to specify particular files.

 @param anAttMask Bitmask indicating the attributes of interest. Only files and

                  directories whose attributes match those specified here can be

                  included in the listing. For more information,

                  see KEntryAttMatchMask and the other directory entry details.

                  Also see KEntryAttNormal and the other file or directory attributes.

 @param aKey      The sort key. This is a set of flags indicating the order in

                  which the entries are to be sorted. These flags are defined

                  by TEntryKey.

 @param aFileList On return contains a filtered list of directory and file entries.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @see TEntryKey

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir2, MODULEUID, Handle(), aName, anAttMask, aKey);

 	RDir d;

 	if ((aKey&0xff)==ESortByUid)

 		anAttMask|=KEntryAttAllowUid;

 	TRAPD(r,GetDirL(aName,anAttMask,aKey,aFileList,d))

 	d.Close();

 	if (r!=KErrNone)

 		{

 		delete aFileList;

 		aFileList=NULL;

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir2Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::GetDir(const TDesC& aName,TUint anAttMask,TUint aKey,CDir*& aFileList,CDir*& aDirList) const

 /**

 Gets a filtered list of the directory and file entries contained in

 a directory, and a list of the directory entries only.

 The bitmask	determines which file and directory entry types should be listed in

 aFileList. The contents of the second list, aDirList are not affected by the bitmask; it

 returns all directory entries contained in directory aName. The

 sort key determines the order in which both lists are sorted.

 Notes:

 1. If sorting by UID (as indicated when the ESortByUid bit is OR'ed with

    the sort key), then UID information will be included in the listing

    whether or not KEntryAttAllowUid is specified in anAttMask.

 2. The function sets both aFileList and aDirList to NULL, and then allocates

    memory to them before appending entries to the lists. Therefore, aFileList

    and aDirList should have no memory allocated to them before this

    function is called, otherwise the allocated memory will become orphaned.

 3. The caller of this function is responsible for deleting aFileList

    and aDirList after the function has returned.

 @param aName     The name of the directory for which a listing is required.

                  Wildcards may be used to specify particular files.

 @param anAttMask Bitmask indicating the attributes of interest. Only files and

                  directories whose attributes match those specified here can be

                  included in aFileList. aDirList is unaffected by this mask. 

                  For more information, see KEntryAttMatchMask and the other

                  directory entry details.

                  Also see KEntryAttNormal and the other file or directory

                  attributes.

 @param aKey      The sort key. This is a set of flags indicating the order in

                  which the entries in both lists are to be sorted. These flags

                  are defined by TEntryKey.

 @param aFileList On return contains a filtered list of directory and

                  file entries.

 @param aDirList  On return contains a filtered list of directory entries only.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @see TEntryKey

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir3, MODULEUID, Handle(), aName, anAttMask, aKey);

 	RDir d;

 	if (aKey&ESortByUid)

 		anAttMask|=KEntryAttAllowUid;

 	TRAPD(r,GetDirL(aName,anAttMask,aKey,aFileList,aDirList,d))

 	d.Close();

 	if (r!=KErrNone)

 		{

 		delete aFileList;

 		aFileList=NULL;

 		delete aDirList;

 		aDirList=NULL;

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsGetDir3Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Parse(const TDesC& aName,TParse& aParse) const

 /**

 Parses a filename specification.

 Parsing is done with wildcard resolution, using the session path as

 the default. You can then use TParse's getter functions to extract individual

 components of the resulting name. All the path components that are included

 in aName are put into the resulting	filename. Any components that are still

 missing are taken from the session path.

 Specifying:

 @code

 TParse fp;

 @endcode

 @code

 fs.Parse(name,fp);

 @endcode

 is equivalent to 

 @code

 TParse fp;

 @endcode

 @code

 fp.Set(name,NULL,&fs.SessionPath());

 @endcode

 Note that the function does not check for illegal characters, or for

 illegal path components in either of the paths specified.

 @param aName  The file name to be parsed, using the session path to provide

               the missing components.

 @param aParse A TParse objct that provides functions for

               extracting individual components of the resulting file name.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsParse1, MODULEUID, Handle(), aName);

 	TFileName session_path;

 	TInt r = SessionPath(session_path);

 	if (r==KErrNone)

 		r = aParse.Set(aName, NULL, &session_path);

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsParse1Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Parse(const TDesC& aName,const TDesC& aRelated,TParse& aParse) const

 /**

 Parses a filename specification, specifying related file path components.

 Parsing is done with wildcard resolution, using the session path as

 the default. You can then use TParse's getter functions to extract individual

 components of the resulting name. All the path components that are included

 in aName are put into the resulting	filename. Any missing components are taken

 from the optional aRelated argument, which has the next order of precedence.

 Finally, any components that are still missing are taken from the session path.

 Specifying:

 @code

 TParse fp;

 @endcode

 @code

 fs.Parse(name,related,fp);

 @endcode

 is equivalent to 

 @code

 TParse fp;

 @endcode

 @code

 fp.Set(name,related,&fs.SessionPath());

 @endcode

 Note that the function does not check for illegal characters, or for

 illegal path components in any of the paths specified.

 @param aName    The file name to be parsed, using the session path and the

                 related path to provide the missing components.

 @param aRelated The related file specification.

 @param aParse   A TParse objct that provides functions for

                 extracting individual components of the resulting file name.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsParse2, MODULEUID, Handle(), aName, aRelated);

 	TFileName session_path;

 	TInt r = SessionPath(session_path);

 	if (r==KErrNone)

 		r = aParse.Set(aName, &aRelated, &session_path);

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsParse2Return, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Delete(const TDesC& aName)

 /**

 Deletes a single file.

 Wildcards are not allowed in either the	file name or the extension,

 otherwise an error is returned.

 Note that the file must be closed and must not be read-only.

 Hidden files can be deleted but system files cannot.

 See class CFileMan for information on deleting multiple files.

 @param aName The name of the file to be deleted. Any path components which

              are not specified here will be taken from the session path.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aName is /Sys then Tcb capability is required.

 @capability Dependent If aName begins with /Private and does not match this process' SID

 					  then AllFiles capability is required.

 @capability Dependent If aName is /Resource then Tcb capability is required.

 @see CFileMan        

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsDelete, MODULEUID, Handle(), aName);

 	TInt r = SendReceive(EFsDelete,TIpcArgs(&aName));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsDeleteReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Rename(const TDesC& anOldName,const TDesC& aNewName)

 /**

 Renames a single file or directory.

 It can also be used to move a file or directory by specifying different

 destination and source directories.	If so, the destination and source

 directories must be on the same drive. If a	directory is moved, then

 the directory structure beneath it is also	moved.

 If a directory specified by aNewName is different from one specified

 by anOldName, then the file or directory is	moved to the new directory.

 The file or directory cannot be moved to another device by this means,

 either explicitly (by another drive	specified in the name) or implicitly

 (because the directory has been mapped to another device with SetSubst().

 The function fails and returns an error code in the following

 circumstances:

 1. If either the old or new name includes wildcards.

 2. If a file or directory with the new name already exists in

    the target directory. Overwriting is not permitted.

 3. If file anOldName does not exist, or is open.

 Read-only, system and hidden files may be renamed. The renamed

 file's attributes are preserved.

 Note that when this function is operating on directories, a	trailing backslash

 is not required after the final directory name in either anOldName or aNewName.

 See class CFileMan for information on renaming multiple files.

 @param anOldName File or directory to be renamed. Any path components which are

                  not specified here will be taken from the session path.

 @param aNewName  Path specifying the new name for the file or directory and/or

 				 its new parent directory. All directories specified in this path

 				 must exist.

 				 Any path components which are not specified here will be taken

 				 from the session path.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If either anOldName or aNewName is /Sys then Tcb capability is required.

 @capability Dependent If either anOldName or aNewName begins with /Private and does not match

 					  this process' SID then AllFiles capability is required.

 @capability Dependent If either anOldName or aNewName is /Resource then Tcb capability is required.

 @see CFileMan        

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsRename, MODULEUID, Handle(), anOldName, aNewName);

 	TInt r;

 	if (anOldName.Length() <= 0 || aNewName.Length() <= 0 )

 		r = KErrBadName;

 	else

 		r = SendReceive(EFsRename,TIpcArgs(&anOldName,&aNewName));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsRenameReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Replace(const TDesC& anOldName,const TDesC& aNewName)

 /**

 Replaces a single file with another.

 This function does not support the use of wildcards. Unlike Rename(), it only

 applies to files.

 This function operates as follows:

 1. if the aNewName file does not exist, it is created.

 2. anOldName's contents, attributes and the date and time of its last

    modification are copied to file aNewName, overwriting any existing contents

    and attribute details.

 3. anOldName is deleted.

 anOldName may be hidden, read-only or a system file. However,

 neither anOldName, nor, if it exists, aNewName, can be open;

 aNewName must not be read-only.

 Both files must be on the same drive.

 @param anOldName The file to be replaced. Must exist and must be closed. It is

                  deleted by this function.

 @param aNewName  The file to replace anOldName. Does not need to exist, but if

                  it does exist, it must be closed. If it exists, its name

                  remains unchanged but its contents, attributes and the date

                  and time of its last modification are replaced by those

                  of anOldName.

                  If it does not exist, it will be created and is assigned

                  the contents and attributes of anOldName. Must not be followed

                  by a trailing backslash.

 @return KErrNone, if successful;

         KErrAccessDenied, if an attempt is made to replace a directory;

         otherwise one of the other system-wide error codes. 

 @capability Dependent If either anOldName or aNewName is /Sys then Tcb capability is required.

 @capability Dependent If either anOldName or aNewName begins with /Private and does not match

 					  this process' SID then AllFiles capability is required.

 @capability Dependent If either anOldName or aNewName is /Resource then Tcb capability is required.

 */

 	{

 	TRACEMULT3(UTF::EBorder, UTraceModuleEfsrv::EFsReplace, MODULEUID, Handle(), anOldName, aNewName);

 	TInt r = SendReceive(EFsReplace,TIpcArgs(&anOldName,&aNewName));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsReplaceReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Att(const TDesC& aName,TUint& aVal) const

 /**

 Gets a file's attributes.

 @param aName The filename. Any path components which are not specified here

              will be taken from the session path.

 @param aVal  On return, the individual bits within the byte indicate which

              attributes have been set. For more information see KEntryAttNormal

 	         and the other file/directory attributes.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aName contains /sys/ then AllFiles capability is required.

 @capability Dependent If aName contains /Private/ and does not match

 					  this process' SID then AllFiles capability is required.

 @see KEntryAttNormal

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsAtt, MODULEUID, Handle(), aName);

 	TEntry e;

 	TInt r=Entry(aName,e);

 	if (r==KErrNone)

 		aVal=e.iAtt;

 	TRACERET2(UTF::EBorder, UTraceModuleEfsrv::EFsAttReturn, MODULEUID, r, aVal);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetAtt(const TDesC& aName,TUint aSetAttMask,TUint aClearAttMask)

 /**

 Sets or clears the attributes of a single file or directory.

 The function uses two bitmasks. The first bitmask specifies the	attributes

 to be set; the second specifies the attributes to be cleared.

 An attempt to set or clear the KEntryAttDir, KEntryAttVolume or KEntryAttRemote

 attributes have no effect.

 @param aName          File or directory name. Any path components which are not

                       specified here will be taken from the session path. Must

                       not include wildcard characters. The file must be closed.

 @param aSetAttMask    Bitmask indicating the attributes to be set.

 @param aClearAttMask  Bitmask indicating the attributes to be cleared. For more

 				      information, see KEntryAttNormal and the other file or

 				      directory attributes.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @panic FSCLIENT 21 if any attribute appears in both bitmasks.

 @capability Dependent If aName is /Sys then Tcb capability is required.

 @capability Dependent If aName begins with /Private and does not match

 					  this process' SID then AllFiles capability is required.

 @capability Dependent If aName is /Resource then Tcb capability is required.

 @see RFs::SetEntry

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsSetAtt, MODULEUID, 

 		Handle(), aName, aSetAttMask, aClearAttMask);

  	TInt r = SetEntry(aName,TTime(0),aSetAttMask,aClearAttMask);

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetAttReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Modified(const TDesC& aName,TTime& aTime) const

 /**

 Gets the last modification date and time of a file or a directory,

 in UTC.

 If there has been no modification, the function gets the date and

 time of the file or directory's creation.

 @param aName File or directory name.

 @param aTime On return, contains the date and time of the file or

              directory's last modification in universal time.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aName contains /sys/ then AllFiles capability is required.

 @capability Dependent If aName contains /Private/ and does not match

 					  this process' SID then AllFiles capability is required.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsModified, MODULEUID, Handle(), aName);

 	TEntry e;

 	TInt r=Entry(aName,e);

 	if (r==KErrNone)

 		aTime=e.iModified;

 	TRACERET3(UTF::EBorder, UTraceModuleEfsrv::EFsModifiedReturn, MODULEUID, r, I64LOW(aTime.Int64()), I64HIGH(aTime.Int64()));

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetModified(const TDesC& aName,const TTime& aTime)

 /**

 Sets the date and time that the contents of a file or directory

 were modified, in UTC.

 @param aName File or directory name.

 @param aTime The new date and time that the file or directory was modified

              in universal time.

 @return KErrNone if successful;

         KErrInUse, if the file is open;

         otherwise one of the other system-wide error codes.

 @capability Dependent If aName is /Sys then Tcb capability is required.

 @capability Dependent If aName begins with /Private and does not match

 					  this process' SID then AllFiles capability is required.

 @capability Dependent If aName is /Resource then Tcb capability is required.

 */

 	{

 	TRACEMULT4(UTF::EBorder, UTraceModuleEfsrv::EFsSetModified, MODULEUID, Handle(), aName, I64LOW(aTime.Int64()), I64HIGH(aTime.Int64()) );

 	TInt r = SetEntry(aName,aTime,KEntryAttModified,0);

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetModifiedReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::Entry(const TDesC& aName,TEntry& anEntry) const

 /**

 Gets the entry details for a file or directory.

 This information includes UID information.

 @param aName   Name of file or directory.

 @param anEntry On return, contains the entry details for the file or directory. TEntry::iModified contains UTC date and time.

 @return KErrNone if successful, otherwise one of the other

         system-wide error codes.

 @capability Dependent If aName contains "\\Sys\\" and includes an additional file or directory then AllFiles capability 

 					  is required. For example, the paths "c:\\sys" and "c:\\sys\\" will always be readable, whereas

 					  the path "c:\\sys\\abc\\" will only be readable with AllFiles capability.

 @capability Dependent If aName contains \\Private\\ and includes an additional file, or a directory which does not match

 					  this process' SID, then AllFiles capability is required. For example, the paths "c:\\private" and 

 					  "c:\\private\\" will always be readable, whereas the path "c:\\private\\<n>\\" will only be 

 					  readable with AllFiles capability or if <n> matches the process' SID.

 */

 	{

 	TRACEMULT2(UTF::EBorder, UTraceModuleEfsrv::EFsEntry, MODULEUID, Handle(), aName);

 	TPckg<TEntry> e(anEntry);

 	TInt r = SendReceive(EFsEntry,TIpcArgs(&aName,&e));

 	TRACE5(UTF::EBorder, UTraceModuleEfsrv::EFsEntryReturn, MODULEUID, 

 		r, anEntry.iAtt, 

 		I64LOW(anEntry.iModified.Int64()), I64HIGH(anEntry.iModified.Int64()), 

 		anEntry.iSize);

 	return r;

 	}

 EFSRV_EXPORT_C TInt RFs::SetEntry(const TDesC& aName,const TTime& aTime,TUint aSetAttMask,TUint aClearAttMask)

 /**

 Sets both the attributes and the last modified date and time for a file or directory.

 The function uses two bitmasks. The first bitmask determines

 which attributes should be set. The second bitmask determines which should be cleared.

 An attempt to set or clear the KEntryAttDir, KEntryAttVolume or KEntryAttRemote

 attributes have no effect.

 @param aName          File or directory name.

 @param aTime	      New date and time. UTC date and time should be used.

 @param aSetAttMask    Bitmask indicating which attributes are to be set.

 @param aClearAttMask  Bitmask indicating which attributes are cleared. For more

                       information, see KEntryAttNormal, and the other file

                       or directory attributes.

 @return KErrNone, if successful;

         KErrInUse, if the file is open;

         otherwise one of the other system-wide error codes.

 @panic FSCLIENT 21 if any attribute appears in both bitmasks.        

 @capability Dependent If aName is /Sys then Tcb capability is required.

 @capability Dependent If aName begins with /Private and does not match

 					  this process' SID then AllFiles capability is required.

 @capability Dependent If aName is /Resource then Tcb capability is required.

 @see KEntryAttNormal

 @see KEntryAttDir

 @see KEntryAttVolume

 */

 	{

 	TRACEMULT6(UTF::EBorder, UTraceModuleEfsrv::EFsSetEntry, MODULEUID, 

 		Handle(), aName, 

 		I64LOW(aTime.Int64()), I64HIGH(aTime.Int64()), 

 		aSetAttMask, aClearAttMask);

 	__ASSERT_ALWAYS((aSetAttMask&aClearAttMask)==0,Panic(EAttributesIllegal));

 	TPtrC8 timeBuf((TUint8*)&aTime,sizeof(TTime));

 	TInt r = SendReceive(EFsSetEntry,TIpcArgs(&aName,&timeBuf,aSetAttMask,aClearAttMask));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsSetEntryReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Reads data from a file without opening it.

 The contents of the	file can be accessed regardless of the file's lock state.

 The file may be open by any number of other clients for reading	or writing.

 In allowing such access to a file, the fileserver makes no guarantees as to

 the validity of the data it returns.

 @param aName    Name of the file to be accessed.

 @param aPos     The offset, in bytes, from the start of the file where

 				reading is to start.

 @param aDes     On return, contains the data read from the file. The length of

 				the descriptor is set to the number of bytes read. If the

 				specified offset lies beyond the end of the file, no data is

 				read and the length of this descriptor is set to zero.

 @param aLength  The number of bytes to be read from the file.

 @return KErrNone if successful, 

 		KErrArgument if aLength is negative,

 		otherwise one of the other system-wide error codes.

 @panic FSCLIENT 19 if aPos negative.

 @panic FSCLIENT 27 if aLength is greater than the maximum length of

        the target descriptor.

 @capability Dependent If the path for aName starts with /Sys capability AllFiles is required

 @capability Dependent If the path for aName starts with /Private and this process does not have 

                       the relevant SID capability AllFiles is required

 */

 EFSRV_EXPORT_C TInt RFs::ReadFileSection(const TDesC& aName,TInt64 aPos,TDes8& aDes,TInt aLength) const

 	{

 	TRACEMULT5(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSection, MODULEUID, 

 		Handle(), aName, I64LOW(aPos), I64HIGH(aPos), aLength);

 	__ASSERT_ALWAYS(aPos>=0,Panic(EPosNegative));

 #ifndef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API

 	if(aPos > KMaxTInt)

 		{

 		TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSectionReturn, MODULEUID, KErrTooBig);

 		return KErrTooBig;

 		}

 	if((aPos + aLength) > KMaxTInt)

 		aLength = KMaxTInt - (TInt)aPos;

 #endif

 	if (aLength)	//	Number of characters to read

 		{

 		__ASSERT_ALWAYS(aDes.MaxLength()>=aLength,Panic(EBadLength));

   	 	}

 	else

 		{

 		aDes.Zero();

 		TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSectionReturn, MODULEUID, KErrNone);

 		return(KErrNone);

 		}

 	__ASSERT_ALWAYS(aDes.MaxLength()>=aLength,Panic(EBadLength));

 	TInt r;

 	if(!(I64HIGH(aPos)))

 		{

 		r = SendReceive(EFsReadFileSection,TIpcArgs(&aDes,&aName,I64LOW(aPos),aLength));

 		}

 	else

 		{

 		TPckgC<TInt64> pkPos(aPos);

 		r = SendReceive(EFsReadFileSection|KIpcArgSlot2Desc,TIpcArgs(&aDes,&aName,&pkPos,aLength));

 		}

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSectionReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Maintained for BC

 @internalTechnology

 */

 EFSRV_EXPORT_C TInt RFs::ReadFileSection_RESERVED(const TDesC& aName,TInt aPos,TDes8& aDes,TInt aLength) const

 	{

 	TRACEMULT5(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSection, MODULEUID, 

 		Handle(), aName, aPos, 0, aLength);

 	__ASSERT_ALWAYS(aPos>=0,Panic(EPosNegative));

 	if (aLength)	//	Number of characters to read

 		{

 		__ASSERT_ALWAYS(aDes.MaxLength()>=aLength,Panic(EBadLength));

   	 	}

 	else

 		{

 		aDes.Zero();

 		TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSectionReturn, MODULEUID, KErrNone);

 		return(KErrNone);

 		}

 	__ASSERT_ALWAYS(aDes.MaxLength()>=aLength,Panic(EBadLength));

 	TInt r = SendReceive(EFsReadFileSection,TIpcArgs(&aDes,&aName,aPos,aLength));

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsReadFileSectionReturn, MODULEUID, r);

 	return r;

 	}

 EFSRV_EXPORT_C void RFs::ResourceCountMarkStart() const

 /**

 Marks the start of resource count checking.

 Typically, this function is called immediately after a client is connected

 to the file server, and before any resources are opened.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCountMarkStart, MODULEUID, Handle());

 	RSessionBase::SendReceive(EFsResourceCountMarkStart);

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCountMarkStartReturn, MODULEUID);

 	}

 EFSRV_EXPORT_C void RFs::ResourceCountMarkEnd() const

 /**

 Ends resource count checking. Typically, this function is called immediately 

 before closing a session with the file server.

 @panic CSessionFs 2 if the number of resources opened since the start of resource 

        count checking is not equal to the number of resources closed.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCountMarkEnd, MODULEUID, Handle());

 	RSessionBase::SendReceive(EFsResourceCountMarkEnd);

 	TRACE0(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCountMarkEndReturn, MODULEUID);

 	}

 EFSRV_EXPORT_C TInt RFs::ResourceCount() const

 /**

 Gets the number of currently open resources.

 The resource count is incremented by one: when a file or directory

 is opened, when a device is opened in preparation for formatting, when a direct access channel

 to a disk is opened.

 @return The number of resources currently open.

 */

 	{

 	TRACE1(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCount, MODULEUID, Handle());

 	TInt count;

 	TPckg<TInt> pckg(count);

 	SendReceive(EFsResourceCount,TIpcArgs(&pckg));

 	TInt r = *(TInt*)pckg.Ptr();

 	TRACERET1(UTF::EBorder, UTraceModuleEfsrv::EFsResourceCountReturn, MODULEUID, r);

 	return r;

 	}

 /**

 Checks the integrity of the disk on the specified drive.

 On FAT, this checks if a cluster number is invalid, if a cluster is allocated to

 more than one file entry, if an unallocated cluster is not set free, and if size

 of an entry is invalid.

 @param aDrive Path indicating the drive which contains the disk to be checked. If the drive 

         information is not specified the current session drive is taken by default.

 		Checkdisk is performed on the requested drive irrespective of the correctness or

 		existance of the given path.

 @return KErrNone, if successful;

 		1, if successful but a file cluster contains a bad value;

 		2, if successful but two files are linked to the same cluster;

 		3, if successful but an unallocated cluster contains a value;

 		4, if successful but the size of a file is not equal to the number of clusters in chain;

         KErrNotReady, if the specified drive is empty;

         KErrNotSupported, if the drive cannot handle this request;

         KErrPermissionDenied, if the caller doesn't have DiskAdmin capability;

         Other system wide error codes may also be returned.