// 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