Symaptic: os/kernelhwsrv/userlibandfileserver/fileserver/sfat/sl_dir

     1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // f32\sfat32\inc\sl_dir_cache.h

    15 //

    16 //

    18 /**

    19  @file

    20  @internalTechnology

    21 */

    23 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    24 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    25 //!!

    26 //!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it

    27 //!!

    28 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    29 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    32 #ifndef SL_DIR_CACHE_H

    33 #define SL_DIR_CACHE_H

    35 #include "sf_memory_man.h"

    36 #include "sf_memory_client.h"

    37 #include "sl_cache.h"

    38 #include <e32hashtab.h>

    40 //---------------------------------------------------------------------------------------------------------------------------------

    41 class   CDynamicDirCache;

    44 /**

    45 The dynamic directory cache page class

    46 */

    47 class TDynamicDirCachePage

    48     {

    49 public:

    50     enum TPageType

    51         {

    52         EUnknown,

    53         ELocked,

    54         EUnlocked,

    55         EActivePage,

    56         };

    58 public:

    59     ~TDynamicDirCachePage();

    60     static TDynamicDirCachePage* NewL(CDynamicDirCache* aOwnerCache, TInt64 aStartMedPos, TUint8* aStartRamAddr);

    62     inline void SetLocked(TBool);

    63     inline TBool    IsLocked() const;

    64     inline TUint8*  StartPtr()  const;

    65     inline void     SetStartPtr(TUint8* aPtr);

    66     inline void SetValid(TBool aIsValid);

    67     inline TBool    IsValid()   const;

    68     inline void SetPageType(TPageType aType);

    69     inline TPageType PageType();

    71     inline TUint32  PageSizeInBytes() const;

    72     inline TUint32  PageSizeInSegs() const;

    74     inline void SetPos(TInt64 aPos);

    75     inline void ResetPos();

    76     inline TInt64   StartPos()  const;

    78     inline TUint8*  PtrInPage(TInt64 aPos) const;

    79     inline TBool    PosCachedInPage(TInt64 aPos) const;

    81     inline void Deque();

    83 private:

    84     // declared to disable copying and assignment

    85     TDynamicDirCachePage& operator=(const TDynamicDirCachePage&);

    86     TDynamicDirCachePage(const TDynamicDirCachePage&);

    88     // private constructor, as this class is not supposed to be created on stack

    89     TDynamicDirCachePage(CDynamicDirCache* aOwnerCache, TInt64 aStartMedPos, TUint8* aStartRamAddr);

    91 public:

    92     TDblQueLink         iLink;          ///< the embedded link object, see TCachePageList

    93     TInt64              iStartMedPos;   ///< the starting media address that this page caches

    94     TUint8*             iStartRamAddr;  ///< the starting ram address that thsi page lives

    95     CDynamicDirCache*   iOwnerCache;    ///< pointer to the cache that owns this page

    96     TBool               iValid  :1;     ///< flag to indicate the validity of the page content

    97     TBool               iLocked :1;     ///< flag to indicate if the page is locked or not

    98     TPageType           iType;          ///< page type, see TPageType

    99     };

   101 /**

   102 The lookup table entry class

   103 @see    CDynamicDirCache

   104 */

   105 class TLookupEntry

   106     {

   107     public:

   108         TLookupEntry(): iPos(0), iRange(0), iPage(NULL) {};

   109         TLookupEntry(TInt64 aPos, TUint32 aRange, TDynamicDirCachePage* aPage): iPos(aPos), iRange(aRange), iPage(aPage) {};

   110     public:

   111         TInt64                  iPos;

   112         TUint32                 iRange;

   113         TDynamicDirCachePage*   iPage;

   114     };

   116 //---------------------------------------------------------------------------------------------------------------------------------

   117 typedef TDblQue<TDynamicDirCachePage> TCachePageList;

   118 /**

   119 Dynamic directory cache.

   120 For now it is directly derived from MWTCacheInterface.

   121 Provides caching FAT directory data.

   122 */

   123 class CDynamicDirCache : public CBase, public MWTCacheInterface

   124     {

   125 public:

   126     ~CDynamicDirCache();

   127     static CDynamicDirCache* NewL(TFatDriveInterface& aDrive, TUint32 aMinPageNum, TUint32 aMaxPageNum, TUint32 aPageSizeLog2, const TDesC& aClientName);

   129     //-- overloads from the base class

   130     void    ReadL (TInt64 aPos, TInt aLength, TDes8& aDes);

   131     void    WriteL(TInt64 aPos, const TDesC8& aDes);

   132     void    InvalidateCache(void);

   133     void    InvalidateCachePage(TUint64 aPos);

   135     TUint32 PosCached(const TInt64& aPosToSearch, TInt64& aCachedPosStart);

   136     TUint32 CacheSizeInBytes()  const;

   137     TInt    Control(TUint32 aFunction, TUint32 aParam1, TAny* aParam2);

   138     void    SetCacheBasePos(TInt64 aBasePos);

   139     void    MakePageMRU(TInt64 aPos);

   140     TUint32 PageSizeInBytesLog2() const;

   142     TUint32 PageSizeInSegs() const;

   144     // Debugging functions

   145     void Dump();

   146     void Info() const;

   148 protected:

   149     CDynamicDirCache(TFatDriveInterface& aDrive, TUint32 aMinSizeInBytes, TUint32 aMaxSizeInBytes, TUint32 aPageSizeInBytesLog2);

   150     void ConstructL(const TDesC& aClientName);

   152     void ReadDataFromSinglePageL(TInt64 aPos, TInt aLength, TDes8& aDes);

   153     void WriteDataOntoSinglePageL(TInt64 aPos, const TUint8* aData, TUint32 aDataLen);

   154     TDynamicDirCachePage* FindPageByPos(TInt64 aPos);

   155     TDynamicDirCachePage* UpdateActivePageL(TInt64 aPos);

   156     TDynamicDirCachePage* AllocateAndLockNewPageL(TInt64 aStartMedPos);

   157     TUint8* LockPage(TDynamicDirCachePage* aPage);

   158     TInt    UnlockPage(TDynamicDirCachePage* aPage);

   159     TInt    DecommitPage(TDynamicDirCachePage* aPage);

   160     inline TInt64  CalcPageStartPos(TInt64 aPos) const;

   161     void CheckThresholds();

   162     inline TBool CacheIsFull() const;

   163     inline TUint32 MaxCacheSizeInPages() const;

   164     TInt DeQueue(TDynamicDirCachePage* aPage);

   165     TInt AddFirstOntoQueue(TDynamicDirCachePage* aPage, TDynamicDirCachePage::TPageType aType);

   166     TInt LookupTblRemove(TInt64 aPagePos);

   167     TInt LookupTblAdd(TDynamicDirCachePage* aPage);

   168     TDynamicDirCachePage* LookupTblFind(TInt64 aPos);

   169     TInt ResetPagePos(TDynamicDirCachePage* aPage);

   170     void MakePageLastLocked(TDynamicDirCachePage* aPage);

   172 private:

   173     TUint32             iPageSizeLog2;      ///< log2 value of cache pages size in bytes

   174     TUint32             iMinCacheSizeInBytes;   ///< minimum cache data size

   175     TUint32             iMaxCacheSizeInBytes;   ///< maximum cache data size

   176     TUint32             iMinSizeInPages;    ///< minimum cache page number

   177     TUint32             iMaxSizeInPages;    ///< maximum cache page number

   178     TUint32             iPageSizeInBytes;   ///< cache page size in bytes

   179     TInt64              iCacheBasePos;      ///< cache pages base position, used to align them at cluster size

   181     TFatDriveInterface& iDrive;             ///< reference to the driver for media access

   182     TUint32             iCacheDisabled : 1; ///< if not 0 the cache is disabled totally and all reads and writes go via TFatDriveInterface directly

   184     TDynamicDirCachePage*   iActivePage;    ///< a unique page in cache, used to read new page before make it MRU or have it replaced

   186     // data structures for LRU page list

   187     TCachePageList  iLockedQ;               ///< the locked queue that manages all locked pages, limited by minimum page number

   188     TCachePageList  iUnlockedQ;             ///< the unlocked queue that manages all locked pages, limited by maximum page number - minimum page number

   189     TUint32         iLockedQCount;

   190     TUint32         iUnlockedQCount;

   192     // data structures for look up table

   193     THashFunction32<TLookupEntry>   iHashFunction;

   194     TIdentityRelation<TLookupEntry> iIdentityFunction;

   195     RHashSet<TLookupEntry>          iLookupTable;   ///< a lookup table that used to speed up page look up

   197     CCacheMemoryClient* iCacheMemoryClient; ///< interface to cache memory manager

   198     };

   200 #include"sl_dir_cache.inl"

   202 #endif //SL_DIR_CACHE_H

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--