// Copyright (c) 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:
// CMassStorageFileSystem implementation.
// 
//



/**
 @file
 @internalTechnology
*/

#include <e32def.h>
#include <f32ver.h>
#include <f32fsys.h>

#include "usbmsshared.h"
#include "mstypes.h"
#include "msctypes.h"
#include "mserverprotocol.h"
#include "cusbmassstoragecontroller.h"
#include "cmassstoragefilesystem.h"
#include "cmassstoragemountcb.h"
#include "debug.h"
#include "msdebug.h"
#include "massstorage.h"

_LIT(KMsFsyName, "MassStorageFileSystem");
_LIT(KMsThreadName, "MassStorageThread");
_LIT(KMsDeadThreadName, "MassStorageDeadThread");
_LIT(KMsFsysSemName, "MassStorageSemaphore");
LOCAL_D const TInt KMsFsyMajorVersionNumber=1;
LOCAL_D const TInt KMsFsyMinorVersionNumber=0;

CMassStorageFileSystem::CMassStorageFileSystem()
	{
    __MSFNLOG
	}

CMassStorageFileSystem::~CMassStorageFileSystem()
	{
    __MSFNLOG
	//Kill the controller thread if it exists
	delete iMassStorageController;
	iMediaChangedStatusList.Close();
	RThread thread;
	TInt err = thread.Open(KMsThreadName);
	if (err == KErrNone)
		{
		thread.Kill(1); //Parameter is irrelevant
		}
	thread.Close();
	iDriveMap.Close();
	}

CMassStorageFileSystem* CMassStorageFileSystem::NewL()
	{
    __MSFNSLOG
	CMassStorageFileSystem*  self = new (ELeave) CMassStorageFileSystem();
	CleanupStack::PushL(self);
	self->ConstructL();
	CleanupStack::Pop(self);
	return self;
	}

void CMassStorageFileSystem::ConstructL()
	{
    __MSFNLOG
	}

/**
Set the file system version and name

@return Any of the standard Symbian error codes.
*/
TInt CMassStorageFileSystem::Install()
	{
    __MSFNLOG
	iVersion=TVersion(KMsFsyMajorVersionNumber, KMsFsyMinorVersionNumber, KF32BuildVersionNumber);
	TInt err = SetName(&KMsFsyName);
	return err;
	}

TInt CMassStorageFileSystem::Remove()
	{
    __MSFNLOG
	TInt err = KErrNone;
	if (iInstalled)
		{
		// Try connecting to the server to send a shutdown message.
		// - If the class controller has a session in use, this will return KErrInUse
		RUsbMassStorage usbMs;
		err = usbMs.Connect();
		if(err == KErrNone)
			{
			err = usbMs.Shutdown();
			usbMs.Close();

			if(err == KErrNone)
				{
				User::WaitForRequest(iThreadStat);
				err = iThreadStat.Int();
				}
			else
				{
				__PRINT1(_L("CMassStorageFileSystem::Remove Shutdown Error %d\n"),err);
				}
			}
		else
			{
			__PRINT1(_L("CMassStorageFileSystem::Remove Connect Error %d\n"),err);
			}
		}
	return(err);
	}

/**
Creates a new Mass Storage mount object.

@return A new CMassStorageMountCB
@leave KErrNotReady if the Mass Storage controller is not running.
*/
CMountCB* CMassStorageFileSystem::NewMountL() const
	{
    __MSFNSLOG
	if (!iRunning)
		{
		User::Leave(KErrNotReady);
		}
	return CMassStorageMountCB::NewL(iDriveMap);
	}

/**
Sets the media attributes and type in the aInfo parameter to those of the specified drive.

@param anInfo TDriveInfo object to store the drive information.
@param aDriveNumber The number of the drive to get the information from.
*/
void CMassStorageFileSystem::DriveInfo(TDriveInfo& aInfo, TInt aDriveNumber) const
	{
    __MSFNSLOG
	TLocalDriveCapsV2Buf caps;
	if (!IsValidLocalDriveMapping(aDriveNumber))
		{
		return;
		}
	GetLocalDrive(aDriveNumber).Caps(caps);
	aInfo.iMediaAtt=caps().iMediaAtt;
    aInfo.iType = ::EMediaNotPresent;  // Media is not available to the file system
	aInfo.iDriveAtt=caps().iDriveAtt;
	}

/**
Returns a reference to the Mass Storage controller.

@return Reference to the Mass Storage controller.
*/
CUsbMassStorageController& CMassStorageFileSystem::Controller()
	{
    __MSFNLOG
	return *iMassStorageController;
	}

/**
Fill iMsDrives with a mapping of lun->drive number for supported mass storage drives

*/
TInt CMassStorageFileSystem::EnumerateMsDrivesL()
	{
    __MSFNLOG
	iDriveMap.Reset();
	TInt driveCount = 0;

	TLocalDriveCapsV2Buf caps;

	for (TInt i = EDriveC; i < KMaxDrives; i++)
		{
		caps.FillZ();

		if (IsValidLocalDriveMapping(i))
			{
			TInt err = GetLocalDrive(i).Caps(caps);
			TInt locDrvNum = DriveNumberToLocalDriveNumber(i);
			__PRINT2(_L("Caps: err=%d, att=%d\n"), err, caps().iDriveAtt);

			TBool isRemovable = err==KErrNotReady || (caps().iDriveAtt & KDriveAttRemovable);
			__PRINT2(_L("EnumerateMsDrives: Drive %c: is %sremovable\n"),
							'A'+i-EDriveA,
							isRemovable?_S(""):_S("NOT "));

			if (isRemovable)
				{
				//
				// STF: Connect to the local drive here.  This gives us the media changed flag, and
				//		our own TBusLocalDrive object for use by the proxy drive and controller.
                //

                TMediaChangedStatus mediaChanged;
                iMediaChangedStatusList.AppendL(mediaChanged);

                TBool& mediaChangedRef = iMediaChangedStatusList[driveCount].iMediaChanged;
				TInt err = iMediaChangedStatusList[driveCount].iLocalDrive.Connect(locDrvNum, mediaChangedRef);
				if (err == KErrNone)
					{
					iDriveMap.Append(static_cast <TDriveNumber>(i));
					}
				driveCount++;
				}
			}
		}

	__PRINT1(_L("EnumerateMsDrives Out, %d MS drives found\n"), driveCount);
	return driveCount;
	}

TBool CMassStorageFileSystem::IsExtensionSupported() const
	{
    __MSFNSLOG
	return ETrue;
	}

/**
Creates a TrapCleanup and ActiveScheduler and initializes the Mass Storage controller.
Start the ActiveScheduler.

@return Any of the standard Symbian error codes.
*/
TInt CMassStorageFileSystem::InitThread()
	{
    __MSFNLOG

	//Give the thread a name so we can kill it later
	User::RenameThread(KMsThreadName);

	CTrapCleanup* cleanup = CTrapCleanup::New();
	if (cleanup == NULL)
		{
		return KErrNoMemory;
		}

	TRAPD(err, InitThreadL());

	delete cleanup;

	__PRINT1(_L("CMassStorageFileSystem::InitThread Out, error=%d\n"), err);
	return err;
	}

TInt CMassStorageFileSystem::InitThreadL()
	{
    __MSFNLOG
	RSemaphore gSemThreadReady;
	gSemThreadReady.OpenGlobal(KMsFsysSemName);

	// Determine which drives are available for Mass Storage.
	// (this also creates a local TBusLocalDrive for use by the drive controller)
	EnumerateMsDrivesL();

	CActiveScheduler* sched = new (ELeave) CActiveScheduler;
	if (sched == NULL)
		{
		gSemThreadReady.Signal();
		User::Leave(KErrNoMemory);
		}
	CleanupStack::PushL(sched);
	CActiveScheduler::Install(sched);

	iMassStorageController = CUsbMassStorageController::NewL();
	if (iMassStorageController == NULL)
		{
		gSemThreadReady.Signal();
		User::Leave(KErrNoMemory);
		}

	__PRINT(_L("CMassStorageFileSystem::InitThread: Creating Mass Storage Controller\n"));
	TRAPD(err, iMassStorageController->CreateL(iDriveMap));
	if (err != KErrNone)
		{
		gSemThreadReady.Signal();
		CActiveScheduler::Install(NULL);
		User::Leave(err);
		}

	CleanupStack::Pop(sched);

	iRunning = ETrue;
	gSemThreadReady.Signal();
	gSemThreadReady.Close();
	CActiveScheduler::Start();

//========= stop thread ================
	delete iMassStorageController;
	iMassStorageController = NULL;

	for (TInt i=0; i < iMediaChangedStatusList.Count(); i++)
		{
        iMediaChangedStatusList[i].iLocalDrive.Disconnect();
		}
	iMediaChangedStatusList.Reset();

	delete sched;
	iRunning = EFalse;
	return KErrNone;
	}

/**
Not supported in Mass Storage file system.

@leave KErrNotReady
*/
CFileCB* CMassStorageFileSystem::NewFileL() const
	{
    __MSFNSLOG
	User::Leave(KErrNotReady);
	return NULL;
	}

/**
Not supported in Mass Storage file system.

@leave KErrNotReady
*/
CDirCB* CMassStorageFileSystem::NewDirL() const
	{
    __MSFNSLOG
	User::Leave(KErrNotReady);
	return NULL;
	}

/**
Not supported in Mass Storage file system.

@leave KErrNotReady
*/
CFormatCB* CMassStorageFileSystem::NewFormatL() const
	{
    __MSFNSLOG
	User::Leave(KErrNotReady);
	return NULL;
	}

/**
Not supported in Mass Storage file system.

@return KErrNotSupported
*/
TInt CMassStorageFileSystem::DefaultPath(TDes& /*aPath*/) const
	{
    __MSFNSLOG
	return KErrNotSupported;
	}

/**
Not supported in Mass Storage file system.

@return KErrNotSupported
*/
TInt CMassStorageFileSystem::DriveList(TDriveList& /*aList*/) const
	{
    __MSFNSLOG
	return KErrNotSupported;
	}

/**
Thread entry point.
*/
LOCAL_C TInt MsInitThreadFn(TAny* aPtr)
	{
	User::SetCritical(User::ESystemCritical);
	((CMassStorageFileSystem*)aPtr)->InitThread();
	//Rename the thread so we can create a new one with the same original name later
	User::RenameThread(KMsDeadThreadName);
	return KErrNone;
	}

/**
Standard entry point for file systems.
Creates a new file system object and starts a new thread for the Mass Storage controller.
*/
extern "C" EXPORT_C CFileSystem* CreateFileSystem()
	{
	__PRINT(_L("CMassStorageFileSystem::CreateFileSystem In\n"));
	RSemaphore gSemThreadReady;
	TInt err = gSemThreadReady.CreateGlobal(KMsFsysSemName, 0);
	if (err != KErrNone)
		{
		__PRINT1(_L("CMassStorageFileSystem::CreateFileSystem Out Semaphore Error %d\n"),err);
		return NULL;
		}

	CFileSystem* msFsys = NULL;
	TRAP(err,  msFsys = CMassStorageFileSystem::NewL());
	if (err != KErrNone)
		{
		__PRINT1(_L("CMassStorageFileSystem::CreateFileSystem Out MSFS Error %d\n"),err);
		gSemThreadReady.Close();
		return NULL;
		}

	RThread msThread;
	__PRINT(_L("CMassStorageFileSystem::CreateFileSystem: Creating Mass Storage thread\n"));
	err = msThread.Create(KMsThreadName, MsInitThreadFn, KDefaultStackSize, NULL, msFsys);
	if (err != KErrNone)
		{
		__PRINT1(_L("CMassStorageFileSystem::CreateFileSystem Out Thread Error %d\n"),err);
		gSemThreadReady.Close();
		return msFsys;
		}
	((CMassStorageFileSystem*)msFsys)->iInstalled=ETrue;


	msThread.Logon(((CMassStorageFileSystem*)msFsys)->iThreadStat);
	msThread.Resume();
	gSemThreadReady.Wait();
	gSemThreadReady.Close();
	msThread.Close();

	__PRINT(_L("CMassStorageFileSystem::CreateFileSystem Out Clean\n"));

	return msFsys;
	}