150 lines
3 KiB
C++
150 lines
3 KiB
C++
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/*++
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Copyright (c) 1992-2000 Microsoft Corporation
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Module Name:
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rwcache.hxx
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Abstract:
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This class implements a read write cache.
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Author:
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Norbert Kusters (norbertk) 23-Apr-92
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--*/
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#if !defined(_READ_WRITE_CACHE_DEFN_)
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#define _READ_WRITE_CACHE_DEFN_
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#include "dcache.hxx"
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#include "hmem.hxx"
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#include "numset.hxx"
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#if defined ( _AUTOCHECK_ )
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#define IFSUTIL_EXPORT
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#elif defined ( _IFSUTIL_MEMBER_ )
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#define IFSUTIL_EXPORT __declspec(dllexport)
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#else
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#define IFSUTIL_EXPORT __declspec(dllimport)
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#endif
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//#define RWCACHE_PERF_COUNTERS 1
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struct RW_CACHE_BLOCK {
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BOOLEAN InUse;
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BOOLEAN IsDirty;
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ULONG Age;
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BIG_INT SectorNumber;
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HMEM SectorBuffer;
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};
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DEFINE_POINTER_TYPES(RW_CACHE_BLOCK);
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DECLARE_CLASS(READ_WRITE_CACHE);
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class READ_WRITE_CACHE : public DRIVE_CACHE {
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public:
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IFSUTIL_EXPORT
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DECLARE_CONSTRUCTOR( READ_WRITE_CACHE );
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VIRTUAL
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~READ_WRITE_CACHE(
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);
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NONVIRTUAL
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IFSUTIL_EXPORT
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BOOLEAN
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Initialize(
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IN OUT PIO_DP_DRIVE Drive,
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IN ULONG NumberOfCacheBlocks
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);
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VIRTUAL
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BOOLEAN
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Read(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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OUT PVOID Buffer
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);
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VIRTUAL
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BOOLEAN
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Write(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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IN PVOID Buffer
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);
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VIRTUAL
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BOOLEAN
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Flush(
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);
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#if defined(RWCACHE_PERF_COUNTERS)
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NONVIRTUAL
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IFSUTIL_EXPORT
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VOID
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QueryPerformanceCounters(
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PULONG RMiss,
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PULONG RHit,
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PULONG ROverHead,
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PULONG WMiss,
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PULONG WHit,
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PULONG Usage
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);
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#endif
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private:
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NONVIRTUAL
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PRW_CACHE_BLOCK
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GetSectorCacheBlock(
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IN BIG_INT SectorNumber
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);
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NONVIRTUAL
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PRW_CACHE_BLOCK
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GetNextAvailbleCacheBlock(
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IN BIG_INT SectorNumber
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);
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NONVIRTUAL
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VOID
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FlushThisCacheBlock(
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IN OUT PRW_CACHE_BLOCK Block
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);
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NONVIRTUAL
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VOID
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Construct(
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);
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NONVIRTUAL
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VOID
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Destroy(
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);
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NUMBER_SET _sectors_cached;
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PRW_CACHE_BLOCK* _cache_blocks;
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ULONG _num_blocks;
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HMEM _write_buffer;
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ULONG _sector_size;
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BOOLEAN _error_occurred;
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ULONG _sectors_per_buffer;
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#if defined(RWCACHE_PERF_COUNTERS)
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ULONG _RMiss, _RHit, _ROverHead, _WMiss, _WHit, _Usage;
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#endif
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};
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#endif
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