author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// f32\sfat32\inc\sl_facache32.h |
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// FAT32 various cache classes definition |
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// |
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// |
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/** |
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@file |
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@internalTechnology |
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*/ |
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#ifndef SL_FAT_CACHE_32_H |
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#define SL_FAT_CACHE_32_H |
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#include "sl_fatcache.h" |
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class CFat32LruCachePage; |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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FAT32 LRU paged cache. Used for FAT32 only. |
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Consists of LRU list of cache pages; Each page is logically divided to page sectors. The number of pages depends on the |
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maximal amount of memory this cache allowed to use. Usually, whole FAT32 can not be cached fully because of its large size. |
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So, this type caches the most receinlly used areas of the FAT32. This is the wriite-back cache. |
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Read granularity: One page, which size is 2^aRdGranularityLog2 |
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Write granularity: cache's page sector; its size is 2^aWrGranularityLog2 |
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*/ |
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class CFat32LruCache : public CFatPagedCacheBase |
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{ |
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public: |
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static CFat32LruCache* NewL(CFatMountCB* aOwner, TUint32 aMaxMemSize, TUint32 aRdGranularityLog2, TUint32 aWrGranularityLog2); |
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//-- overrides from base class |
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virtual void Close(TBool aDiscardDirtyData); |
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virtual void FlushL(); |
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virtual TUint32 ReadEntryL(TUint32 aIndex); |
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virtual void WriteEntryL(TUint32 aIndex, TUint32 aEntry); |
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virtual TInt Invalidate(); |
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virtual TInt InvalidateRegion(TUint32 aStartEntry, TUint32 aNumEntries); |
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virtual CFatBitCache* BitCacheInterface(); |
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public: |
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TBool FindFreeEntryInCacheSectorL(TUint32& aFatEntryIndex); |
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private: |
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void InitialiseL(CFatMountCB* aOwner, TUint32 aFatSize, TUint32 aRdGranularityLog2, TUint32 aWrGranularityLog2); |
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CFat32LruCache(); |
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CFat32LruCache(const CFat32LruCache&); |
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CFat32LruCache& operator=(const CFat32LruCache&); |
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TBool ReadCachedEntryL(TUint32 aFatIndex, TFat32Entry& aResult); |
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TBool WriteCachedEntryL(TUint32 aFatIndex, TFat32Entry aFatEntry); |
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CFat32LruCachePage* DoGetSpareCachePageL(); |
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void AssertCacheReallyClean() ; |
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private: |
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typedef TDblQue<CFat32LruCachePage> TPageList; |
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typedef TDblQueIter<CFat32LruCachePage> TPageIterator; |
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TUint32 iMaxFatEntries; ///< maximal number of FAT entries in FAT table |
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TUint iNumPagesAllocated; ///< number of pages currently allocated |
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TUint iMaxPages; ///< maximal pages allowed to allocate |
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TPageList iPageList; ///< LRU list of cache pages. |
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CFatBitCache *iBitCache; ///< pointer to the FAT bit supercache |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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FAT32 LRU cache page. Used only by CFat32LruCache. |
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*/ |
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class CFat32LruCachePage : public CFatCachePageBase |
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{ |
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public: |
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static CFat32LruCachePage* NewL(CFatPagedCacheBase& aCache); |
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//-- overrides |
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virtual TBool ReadCachedEntryL (TUint32 aFatIndex, TUint32& aResult); |
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virtual TBool WriteCachedEntryL(TUint32 aFatIndex, TUint32 aFatEntry); |
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virtual TUint32 ReadFromMediaL(TUint32 aFatIndex); |
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//---- |
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private: |
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CFat32LruCachePage(CFatPagedCacheBase& aCache); |
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//-- outlaws here |
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CFat32LruCachePage(); |
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CFat32LruCachePage(const CFat32LruCachePage&); |
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CFat32LruCachePage& operator=(const CFat32LruCachePage&); |
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inline TFat32Entry* GetEntryPtr(TUint32 aFatIndex) const; |
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virtual void DoWriteSectorL(TUint32 aSector); |
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private: |
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enum {KFat32EntryMask = 0x0FFFFFFF}; ///< FAT32 entry mask |
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public: |
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TDblQueLink iLink; ///< list link object. See TPageList |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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/** |
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FAT32 bit supercache. This is a special cache above the CFat32LruCache. |
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Used for quick lookup for the free entries in FAT32 table without accessing media and thrashing FAT32 LRU cache. |
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Logically consists of a bit vector, where each bit represents one FAT sector (one unit of read granularity within CFat32LruCachePage) |
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for the _whole_ FAT table. |
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If some bit in the vector is set to '1' it means that the corresponding FAT cache sector (not necessarily currently cached) _may_ have |
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a at least one free FAT entry. If the bit is '0' it means that there is no free fat entries in this part of the FAT. |
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The situation when bit set to '1' corresponds to the FAT cache sector without free entries is quite possible, but it is resolved by this cache. |
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The situation when '0' bit corresponds to the fat sector that _does_ contain free entries is extremely unlikely and can be |
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caused by direct raw writes to the FAT, for example. Nothing terribly wrong with this situation, the search for free entry will fall back |
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to the old algorithm CFatTable::FindClosestFreeClusterL() . |
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The information in this cache is also updated on flushing dirty sectros by CFat32LruCachePage. |
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*/ |
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class CFatBitCache : public CBase |
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{ |
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public: |
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~CFatBitCache(); |
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static CFatBitCache* New(CFat32LruCache& aOnwerFatCache); |
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void Close(); |
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TBool StartPopulating(); |
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TBool FinishPopulating(TBool aSuccess); |
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/** possible states of this cache */ |
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enum TState |
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{ |
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EInvalid, ///< initial, invalid |
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ENotPopulated, ///< initialised, but not populated yet |
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EPopulating, ///< in the process of populating |
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EPopulated, ///< successfully populated; the only consistent state. |
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}; |
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inline TState State() const; |
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inline TBool UsableState() const; |
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inline TBool FatSectorHasFreeEntry(TUint32 aFatSectorNum) const; |
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inline void SetFreeEntryInFatSector(TUint32 aFatSectorNum, TBool aHasFreeEntry); |
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TBool SetFreeFatEntry(TUint32 aFatIndex); |
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TInt FindClosestFreeFatEntry(TUint32& aFatIndex); |
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void MarkFatRange(TUint32 aStartFatIndex, TUint32 aEndFatIndex, TBool aAsFree); |
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void Dump() const; |
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private: |
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//-- outlaws |
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CFatBitCache(); |
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CFatBitCache(const CFatBitCache&); |
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CFatBitCache& operator=(const CFatBitCache&); |
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CFatBitCache(CFat32LruCache& aOnwerFatCache); |
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TInt Initialise(); |
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inline void SetState(TState aState); |
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inline TUint32 FatIndexToCacheSectorNumber(TUint32 aFatIndex) const; |
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inline TUint32 CacheSectorNumberToFatIndex(TUint32 aCacheSecNum) const; |
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private: |
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TState iState; ///< internal state of the cache |
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RBitVector iBitCache; ///< bit vector itself |
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TUint32 iFatIdxToSecCoeff; ///< Log2(FatCacheSectorSize/Sizeof(FAT32 entry)). Used to convert FAT32 index to FAT32 cache sector number and back. |
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CFat32LruCache& iOwnerFatCache; ///< reference to the owner FAT32 LRU cache |
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DBG_STATEMENT(TUint iPopulatingThreadId;) ///< used in debug mode for checking multithreading issues |
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}; |
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//--------------------------------------------------------------------------------------------------------------------------------- |
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#include "sl_fatcache32.inl" |
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#endif //SL_FAT_CACHE_32_H |
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