// Copyright (c) 2006-2009 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\sfile\sf_file_cache_defs.h

// This file contains default settings for file caching. 

// Some of these settings may be overriden by appropriate entries in the estart.txt file

// Sizes / lengths specified in kilobytes, timeouts in miliseconds

// 

//

/**

 @file

 @internalTechnology

*/

// Global file-cache settings 

const TBool KDefaultGlobalCacheEnabled			= ETrue; 

const TInt KDefaultGlobalCacheSize				= (32*1024);	// 32768 K = 32 MBytes - the maximum for all files

// The maximum amount of locked data allowed for all files

const TInt KDefaultGlobalCacheMaxLockedSize	= (1*1024);		// 1 Mb maximum locked data

// Low memory threshold as a percentage of total RAM.

// If the amount of RAM drops below this value, attempts to allocate memory for a file caching will fail

const TInt KDefaultLowMemoryThreshold			= 10;			// 10 % of total RAM

// per-drive file-cache settings. 

const TInt KDefaultFileCacheMaxReadAheadLen	= (128);	// 128K	// NB non-configurable by estart

const TInt KDefaultFileCacheSize				= (256);	// 256K

const TInt KDefaultFairSchedulingLen			= (128);	// 128K

enum {EFileCacheFlagOff, EFileCacheFlagEnabled, EFileCacheFlagOn};

// default drive cache settings - these may be overridden by estart.txt settings or file open mode 

const TInt KDefaultFileCacheRead				= EFileCacheFlagEnabled;

const TInt KDefaultFileCacheReadAhead			= EFileCacheFlagOn;		// NB only enabled if read caching also enabled

const TInt KDefaultFileCacheWrite				= EFileCacheFlagEnabled;

/**

If set to ETrue, media driver reads on this drive are considered to be asynchronous 

i.e. interrupt driven. This results in read-aheads being issued before completing a client read request.

If set to EFalse, media driver reads on this drive are considered to be synchronous 

i.e. issuing a read-ahead is likely to block any client thread which will normally be running at

lower priority than the media driver's thread. In this case read-aheads only happen during periods 

of inactivity so as to improve latency: this is achieved by lowering the process of the drive thread

if there is only one read-ahead request in the drive thread's queue.

*/

const TInt KDefaultFileCacheReadAsync			= ETrue;

// time after which a file will be removed from closed file queue

const TInt KDefaultClosedFileKeepAliveTime = 3000;			// 3,000 ms = 3 seconds

// time after which a file containing dirty data will be flushed

const TInt KDefaultDirtyDataFlushTime = 3000;				// 3,000 ms = 3 seconds