//+--------------------------------------------------------------------------- // // Microsoft Corporation // Copyright (C) Microsoft Corporation, 1992 - 1998. // // File: PhysIdx.CXX // // Contents: FAT Buffer/Index package // // Classes: CPhysBuffer -- Buffer // // History: 05-Mar-92 KyleP Created // 07-Aug-92 KyleP Kernel implementation // 21-Apr-93 BartoszM Rewrote to use memory mapped files // //---------------------------------------------------------------------------- #include #pragma hdrstop #include #include #include #include //+------------------------------------------------------------------------- // // Function: PageToLow // // Returns: Low part of byte count in cPage pages // // History: 21-Apr-93 BartoszM Created // //-------------------------------------------------------------------------- inline ULONG PageToLow(ULONG cPage) { return(cPage << CI_PAGE_SHIFT); } //+------------------------------------------------------------------------- // // Function: PageToHigh // // Returns: High part of byte count in cPage pages // // History: 21-Apr-93 BartoszM Created // //-------------------------------------------------------------------------- inline ULONG PageToHigh(ULONG cPage) { return(cPage >> (ULONG_BITS - CI_PAGE_SHIFT)); } //+------------------------------------------------------------------------- // // Function: ToPages // // Returns: Number of pages equivalent to (cbLow, cbHigh) bytes // // History: 21-Apr-93 BartoszM Created // //-------------------------------------------------------------------------- inline ULONG ToPages ( ULONG cbLow, ULONG cbHigh ) { Win4Assert ( cbHigh >> CI_PAGE_SHIFT == 0 ); return (cbLow >> CI_PAGE_SHIFT) + (cbHigh << (ULONG_BITS - CI_PAGE_SHIFT)); } //+------------------------------------------------------------------------- // // Function: PgCommonPgTrunc // // Returns: Number of pages truncated to multiple of largest common page // // History: 21-Apr-93 BartoszM Created // //-------------------------------------------------------------------------- inline ULONG PgCommonPgTrunc(ULONG nPage) { return nPage & ~(PAGES_PER_COMMON_PAGE - 1); } inline ULONGLONG MAKEULONGLONG( ULONG l, ULONG h ) { return ( l | ( h << 32 ) ); } //+------------------------------------------------------------------------- // // Function: PgCommonPgRound // // Returns: Number of pages rounded to multiple of largest common page // // History: 21-Apr-93 BartoszM Created // //-------------------------------------------------------------------------- inline ULONG PgCommonPgRound(ULONG nPage) { return (nPage + PAGES_PER_COMMON_PAGE - 1) & ~(PAGES_PER_COMMON_PAGE - 1); } //+------------------------------------------------------------------------- // // Member: CPhysBuffer::~CPhysBuffer // // History: 07-Dec-93 BartoszM Created // //-------------------------------------------------------------------------- CPhysBuffer::~CPhysBuffer() { Win4Assert( !_fNeedToFlush ); #if CIDBG == 1 Flush( FALSE ); #endif } //+------------------------------------------------------------------------- // // Member: CPhysBuffer::CPhysBuffer, public // // Synopsis: Allocates virtual memory // // Arguments: [stream] -- stream to use // [PageNo] -- page number // [fWrite] -- for writable memory // [fIntentToWrite] -- When fWrite is TRUE, whether the // client intends to write to the memory so // it needs to be flushed. // // History: 10-Mar-92 KyleP Created // 21-Apr-93 BartoszM Rewrote to use memory mapped files // //-------------------------------------------------------------------------- CPhysBuffer::CPhysBuffer( PMmStream& stream, ULONG PageNo, BOOL fWrite, BOOL fIntentToWrite, BOOL fMap ) : _cRef( 0 ), _pphysNext( 0 ), _fNeedToFlush( fIntentToWrite ), _fWrite( fWrite ), _fMap( fMap ), _stream( stream ) { _PageNo = PgCommonPgTrunc( PageNo ); if ( _fMap ) stream.Map( _strmBuf, COMMON_PAGE_SIZE, PageToLow( _PageNo ), PageToHigh( _PageNo ), fWrite ); else { DWORD cbRead; _xBuffer.Init( COMMON_PAGE_SIZE ); _stream.Read( _xBuffer.Get(), MAKEULONGLONG( PageToLow( _PageNo ), PageToHigh( _PageNo ) ), COMMON_PAGE_SIZE, cbRead ); } } //CPhysBuffer //+------------------------------------------------------------------------- // // Member: CPhysBuffer::Flush, public // // Synopsis: Flushes the buffer to disk // // Arguments: [fFailFlush] -- If TRUE and flush fails, an exception is // raised. Otherwise failures to flush are // ignored. // // History: 10/30/98 dlee Moved out of header // //-------------------------------------------------------------------------- void CPhysBuffer::Flush( BOOL fFailFlush ) { if ( _fNeedToFlush ) { Win4Assert( _fWrite ); // // Reset the flag first, so subsequent attempts to flush won't // fail if first attempt fails. This is so we don't throw // in destructors. If we can't tolerate failures to flush, don't // even bother trying to write the data if we can't fail. // _fNeedToFlush = FALSE; if ( fFailFlush ) { if ( _fMap ) { // Flush the buffer and metadata in one call _strmBuf.Flush( TRUE ); } else { _stream.Write( _xBuffer.Get(), MAKEULONGLONG( PageToLow( _PageNo ), PageToHigh( _PageNo ) ), COMMON_PAGE_SIZE ); } } else { ciDebugOut(( DEB_WARN, "not flushing at %#p, in failure path?\n", this )); } } #if CIDBG == 1 // // Make sure the bits on disk are the same as those in memory, since // the buffer is marked as not needing to be flushed. Only do this if // using read/write instead of mapping. // else if ( !_fMap && fFailFlush ) { TRY { XArrayVirtual xTmp( COMMON_PAGE_SIZE ); DWORD cbRead; _stream.Read( xTmp.Get(), MAKEULONGLONG( PageToLow( _PageNo ), PageToHigh( _PageNo ) ), COMMON_PAGE_SIZE, cbRead ); if ( 0 != memcmp( xTmp.Get(), _xBuffer.Get(), COMMON_PAGE_SIZE ) ) { ciDebugOut(( DEB_ERROR, "read: %p, have: %p\n", xTmp.Get(), _xBuffer.Get() )); Win4Assert( !"writable non-flushed buffer was modified!" ); } } CATCH( CException, e ) { // Ignore -- it's just an assert. } END_CATCH; } #endif // CIDBG == 1 } //Flush //+------------------------------------------------------------------------- // // Member: CBufferCacheIter::CBufferCacheIter, public // // Synopsis: Constructor // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- CBufferCacheIter::CBufferCacheIter ( CBufferCache& cache ) : _pPhysBuf(cache._aPhysBuf.GetPointer()), _idx(0), _cHash( cache._cHash ) { do { _pBuf = _pPhysBuf[_idx]; if (_pBuf != 0) break; _idx++; } while ( _idx < _cHash ); } //CBufferCacheIter //+------------------------------------------------------------------------- // // Member: CBufferCacheIter::operator++, public // // Synopsis: Increments the iterator // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- void CBufferCacheIter::operator++() { Win4Assert(_pBuf != 0); _pBuf = _pBuf->Next(); while (_pBuf == 0 && ++_idx < _cHash ) _pBuf = _pPhysBuf[_idx]; } //+------------------------------------------------------------------------- // // Member: CBufferCache::CBufferCache, public // // Synopsis: Constructor // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- CBufferCache::CBufferCache( unsigned cHash ) : _cBuffers( 0 ), _cHash( cHash ), _aPhysBuf( cHash ) #if CIDBG == 1 , _cCacheHits( 0 ), _cCacheMisses( 0 ) #endif { RtlZeroMemory( _aPhysBuf.GetPointer(), _aPhysBuf.SizeOf() ); } //+------------------------------------------------------------------------- // // Member: CBufferCache::~CBufferCache, public // // Synopsis: Destructor // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- CBufferCache::~CBufferCache() { Free( FALSE ); } //+------------------------------------------------------------------------- // // Member: CBufferCache::Free, public // // Synopsis: Deletes all buffers // // Arguments: [fFailFlush] -- If TRUE, this method will THROW if the flush // fails. If FALSE, flush failures are // ignored. // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- void CBufferCache::Free( BOOL fFailFlush ) { if ( 0 != _cBuffers ) { for ( unsigned i = 0; i < _cHash; i++ ) { // Keep the cache consistent in case we fail flushing. while ( 0 != _aPhysBuf[i] ) { CPhysBuffer * pTemp = _aPhysBuf[i]; pTemp->Flush( fFailFlush ); #if CIDBG == 1 if ( pTemp->IsReferenced() ) ciDebugOut(( DEB_WARN, "Buffer for page %ld still referenced.\n", pTemp->PageNumber() )); #endif // CIDBG == 1 _aPhysBuf[i] = pTemp->Next(); delete pTemp; _cBuffers--; } Win4Assert( 0 == _aPhysBuf[i] ); } Win4Assert( 0 == _cBuffers ); } } //Free //+------------------------------------------------------------------------- // // Member: CBufferCache::TryToRemoveBuffers, public // // Synopsis: Tries to remove unreferenced buffers from the cache. // If one is not found, it's not a problem. // // Arguments: [cMax] -- Recommended maximum in the cache // // History: 15-March-96 dlee Created // //-------------------------------------------------------------------------- void CBufferCache::TryToRemoveBuffers( unsigned cMax ) { for ( unsigned i = 0; i < 3 && ( Count() > cMax ); i++ ) { // find an unreferenced page with the lowest (oldest) usn. ULONG ulPage = ULONG_MAX; ULONG ulUSN = ULONG_MAX; for ( CBufferCacheIter iter(*this); !iter.AtEnd(); ++iter ) { CPhysBuffer * pPhys = iter.Get(); Win4Assert( 0 != pPhys ); if ( ( ulUSN > pPhys->GetUSN() ) && ( !pPhys->IsReferenced() ) ) { ulUSN = pPhys->GetUSN(); ulPage = pPhys->PageNumber(); } } if ( ULONG_MAX == ulPage ) break; else Destroy( ulPage ); } } //TryToRemoveBuffers //+------------------------------------------------------------------------- // // Member: CBufferCache::Search, public // // Synopsis: Searches the buffer hash for the requested buffer. // // Arguments: [ulPage] -- Page number of page to be found. // // Returns: 0 if page not currently buffered, or the pointer // to the (physical) buffer. // // History: 09-Mar-92 KyleP Created // 17-Mar-93 BartoszM Rewrote // //-------------------------------------------------------------------------- CPhysBuffer * CBufferCache::Search( ULONG hash, ULONG commonPage ) { // ciDebugOut (( DEB_ITRACE, "CBufferCache::Search %d\n", ulPage )); for ( CPhysBuffer *pPhys = _aPhysBuf[ hash ]; 0 != pPhys; pPhys = pPhys->Next() ) { if ( pPhys->PageNumber() == commonPage ) break; } #if DBG==1 || CIDBG==1 if ( 0 == pPhys ) _cCacheMisses++; else _cCacheHits++; #endif // DBG==1 || CIDBG==1 return pPhys; } //Search //+--------------------------------------------------------------------------- // // Function: Flush // // Synopsis: Flushes all cached pages upto and including the specified // page to disk. // // Arguments: [nHighPage] -- The "CI" page number below which all pages // must be flushed to disk. // // History: 4-20-94 srikants Created // // Notes: nHighPage is in units of "CI" page (4K bytes) and not // CommonPage which is 64K. // //---------------------------------------------------------------------------- void CBufferCache::Flush( ULONG nHighPage, BOOL fLeaveFlushFlagAlone ) { nHighPage = PgCommonPgTrunc(nHighPage); ciDebugOut(( DEB_ITRACE, "CBufferCache : Flushing All Pages <= 0x%x\n", nHighPage )); if ( 0 == _cBuffers ) return; // // We Must Flush All pages <= the given page number. // for ( CBufferCacheIter iter(*this); !iter.AtEnd(); ++iter ) { CPhysBuffer * pPhys = iter.Get(); Win4Assert( 0 != pPhys ); if ( pPhys->PageNumber() <= nHighPage ) { // Call flush even if not required to get assertions checked BOOL fRequiresFlush = pPhys->RequiresFlush(); pPhys->Flush( TRUE ); if ( fLeaveFlushFlagAlone && fRequiresFlush ) pPhys->SetIntentToWrite(); } } } //Flush //+------------------------------------------------------------------------- // // Member: CBufferCache::Destroy, public // // Synopsis: Deletes a buffer. // // Arguments: [ulPage] -- page number to be deleted // // History: 18-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- void CBufferCache::Destroy( ULONG ulPage, BOOL fFailFlush ) { ulPage = PgCommonPgTrunc(ulPage); ULONG iHash = hash( ulPage ); CPhysBuffer * pPhys = _aPhysBuf[ iHash ]; Win4Assert( 0 != pPhys ); // Find the page. Don't remove from the list until it is flushed. // Is it first? (common case) if (pPhys->PageNumber() == ulPage) { // This should be flushed before being unmapped. Fix for bug 132655 pPhys->Flush( fFailFlush ); _aPhysBuf[iHash] = pPhys->Next(); } else { // Search linked list CPhysBuffer * pPhysPrev; do { pPhysPrev = pPhys; pPhys = pPhys->Next(); Win4Assert( 0 != pPhys ); } while (pPhys->PageNumber() != ulPage ); // This should be flushed before being unmapped. Fix for bug 132655 pPhys->Flush( fFailFlush ); // delete from the linked list pPhysPrev->Link( pPhys->Next() ); Win4Assert ( !pPhys->IsReferenced() ); } _cBuffers--; delete pPhys; } //Destroy //+------------------------------------------------------------------------- // // Member: CBufferCache::Add, public // // Synopsis: Adds a buffer to the buffer hash. // // Arguments: [pPhysBuf] -- Buffer to add. // // History: 09-Mar-92 KyleP Created // //-------------------------------------------------------------------------- void CBufferCache::Add( CPhysBuffer * pPhysBuf, ULONG hash ) { _cBuffers++; pPhysBuf->Reference(); pPhysBuf->Link( _aPhysBuf[ hash ] ); _aPhysBuf[ hash ] = pPhysBuf; } //Add //+------------------------------------------------------------------------- // // Member: CBufferCache::MinPageInUse, public // // Synopsis: Finds the smallest page in use within the cache // // Returns : TRUE if any page is in the cache; FALSE o/w // If TRUE is returned, then minPageInUse will contain the // minimum page that is present in the cache. // // Arguments: minPageInUse (out) Will be set to the minimum page in // the cache if the return value is TRUE. // // History: 02-May-94 DwightKr Created // 08-Dec-94 SrikantS Fixed to return the correct value for // empty cache. // //-------------------------------------------------------------------------- BOOL CBufferCache::MinPageInUse(ULONG &minPageInUse) { ULONG minPage = 0xFFFFFFFF; for (CBufferCacheIter iter(*this); !iter.AtEnd(); ++iter) { minPage = min(minPage, iter.Get()->PageNumber() ); } if ( minPage == 0xFFFFFFFF ) { return FALSE; } else { minPageInUse = minPage; return TRUE; } } //MinPageInUse //+------------------------------------------------------------------------- // // Member: CPhysStorage::CPhysStorage, public // // Effects: Creates a new index. // // Arguments: [storage] -- physical storage to create index in // [obj] -- Storage object // [objectId] -- Index ID // [cPageReqSize] -- // [stream] -- Memory mapped stream // [fThrowCorruptErrorOnFailures -- If true, then errors during // opening will be marked as // catalog corruption // [cCachedItems] -- # of non-referenced pages to cache // [fAllowReadAhead] -- if TRUE, non-mapped IO will be used // when the physical storage says it's ok. // // Signals: Cannot create. // // Modifies: A new index (file) is created on the disk. // // History: 07-Mar-92 KyleP Created // //-------------------------------------------------------------------------- CPhysStorage::CPhysStorage( PStorage & storage, PStorageObject& obj, WORKID objectId, UINT cpageReqSize, PMmStream * stream, BOOL fThrowCorruptErrorOnFailures, unsigned cCachedItems, BOOL fAllowReadAhead ) : _sigPhysStorage(eSigPhysStorage), _fWritable( TRUE ), _objectId( objectId ), _obj ( obj), _cpageUsedFileSize( 0 ), _storage(storage), _stream(stream), _iFirstNonShrunkPage( 0 ), _fThrowCorruptErrorOnFailures(fThrowCorruptErrorOnFailures), _cpageGrowth(1), _cMaxCachedBuffers( cCachedItems ), _cache( __max( 17, ( cCachedItems & 1 ) ? cCachedItems : cCachedItems + 1 ) ), _usnGen( 0 ), _fAllowReadAhead( fAllowReadAhead ) { // // Use different locking schemes depending on usage // if ( 0 == _cMaxCachedBuffers ) _xMutex.Set( new CMutexSem() ); else _xRWAccess.Set( new CReadWriteAccess() ); if ( _stream.IsNull() || !_stream->Ok() ) { ciDebugOut((DEB_ERROR, "Index Creation failed %08x\n", objectId )); if ( _fThrowCorruptErrorOnFailures || _stream->FStatusFileNotFound() ) { // // We don't have code to handle such failures, hence mark // catalog as corrupt; otherwise throw e_fail // Win4Assert( !"Corrupt catalog" ); _storage.ReportCorruptComponent( L"PhysStorage1" ); THROW( CException( CI_CORRUPT_DATABASE )); } else THROW( CException( E_FAIL )); } if (cpageReqSize == 0) cpageReqSize = 1; TRY { _GrowFile( cpageReqSize ); } CATCH( CException, e ) { // // There may not be enough space on the disk to allocate the // requested size. If not enough space, do the best that we // can and hope space gets freed. // _GrowFile( 1 ); } END_CATCH ciDebugOut(( DEB_ITRACE, "Physical index %08x created.\n", _objectId )); } //+------------------------------------------------------------------------- // // Member: CPhysStorage::CPhysStorage, public // // Effects: Opens an existing index. // // Arguments: [storage] -- physical storage to open index in // [obj] -- Storage object // [objectId] -- Index ID. // [stream] -- Memory mapped stream // [mode] -- Open mode // [fThrowCorruptErrorOnFailures -- If true, then errors during // opening will be marked as // catalog corruption // [cCachedItems] -- # of non-referenced pages to cache // [fAllowReadAhead] -- if TRUE, non-mapped IO will be used // when the physical storage says it's ok. // // History: 07-Mar-92 KyleP Created // //-------------------------------------------------------------------------- CPhysStorage::CPhysStorage( PStorage & storage, PStorageObject& obj, WORKID objectId, PMmStream * stream, PStorage::EOpenMode mode, BOOL fThrowCorruptErrorOnFailures, unsigned cCachedItems, BOOL fAllowReadAhead ) : _sigPhysStorage(eSigPhysStorage), _fWritable( PStorage::eOpenForWrite == mode ), _objectId( objectId ), _obj ( obj ), _cpageUsedFileSize( 0 ), _storage(storage), _stream(stream), _fThrowCorruptErrorOnFailures(fThrowCorruptErrorOnFailures), _cpageGrowth(1), _iFirstNonShrunkPage( 0 ), _cMaxCachedBuffers( cCachedItems ), _cache( __max( 17, ( cCachedItems & 1 ) ? cCachedItems : cCachedItems + 1 ) ), _usnGen( 0 ), _fAllowReadAhead( fAllowReadAhead ) { // // Use different locking schemes depending on usage // if ( 0 == _cMaxCachedBuffers ) _xMutex.Set( new CMutexSem() ); else _xRWAccess.Set( new CReadWriteAccess() ); if ( _stream.IsNull() || !_stream->Ok() ) { ciDebugOut(( DEB_ERROR, "Open of index %08x failed\n", objectId )); if ( _fThrowCorruptErrorOnFailures || _stream->FStatusFileNotFound() ) { // // We don't have code to handle such failures, hence mark // catalog as corrupt; otherwise throw e_fail // Win4Assert( !"Corrupt catalog" ); _storage.ReportCorruptComponent( L"PhysStorage2" ); THROW( CException( CI_CORRUPT_DATABASE )); } else THROW( CException( E_FAIL )); } _cpageFileSize = ToPages(_stream->SizeLow(), _stream->SizeHigh()); ciDebugOut(( DEB_ITRACE, "Physical index %08x (%d pages) opened.\n", _objectId, _cpageFileSize )); } //+--------------------------------------------------------------------------- // // Member: CPhysStorage::MakeBackupCopy // // Synopsis: Makes a backup copy of the current storage using the // destination storage. // // Arguments: [dst] - Destination storage. // [progressTracker] - Progress tracking // // History: 3-18-97 srikants Created // //---------------------------------------------------------------------------- void CPhysStorage::MakeBackupCopy( CPhysStorage & dst, PSaveProgressTracker & progressTracker ) { // // Copy one page at a time. // ULONG * pSrcNext = 0; ULONG * pDstNext = 0; unsigned iCurrBorrow = 0; // always has the current buffers borrowed. SCODE sc = S_OK; TRY { // // Grow the destination to be as big as the current one. // dst._GrowFile( _cpageFileSize ); if ( _cpageFileSize > 0 ) { iCurrBorrow = 0; pSrcNext = BorrowBuffer(iCurrBorrow, FALSE ); pDstNext = dst.BorrowNewBuffer(iCurrBorrow); const unsigned iLastPage = _cpageFileSize-1; for ( unsigned j = 0; j < _cpageFileSize; j++ ) { ULONG * pSrc = pSrcNext; ULONG * pDst = pDstNext; Win4Assert( 0 != pSrc && 0 != pDst ); RtlCopyMemory( pDst, pSrc, CI_PAGE_SIZE ); // // Before returning buffers, grab the next ones to prevent // the large page from being taken out of cache. // if ( j != iLastPage ) { iCurrBorrow = j+1; pSrcNext = BorrowBuffer(iCurrBorrow, FALSE ); pDstNext = dst.BorrowNewBuffer(iCurrBorrow); } else { pSrcNext = pDstNext = 0; } ReturnBuffer( j ); dst.ReturnBuffer( j, TRUE ); if ( progressTracker.IsAbort() ) THROW( CException( STATUS_TOO_LATE ) ); // // Update the progress every 64 K. // if ( (j % PAGES_PER_COMMON_PAGE) == (PAGES_PER_COMMON_PAGE-1) ) progressTracker.UpdateCopyProgress( (ULONG) j, _cpageFileSize ); } } dst.Flush(); } CATCH( CException, e ) { if ( pSrcNext ) ReturnBuffer( iCurrBorrow ); if ( pDstNext ) dst.ReturnBuffer(iCurrBorrow); sc = e.GetErrorCode(); } END_CATCH if ( S_OK != sc ) { // // _GrowFile throws CI_CORRUPT_DATABASE if it cannot create // the file that big. We don't want to consider that a // corruption. // if ( CI_CORRUPT_DATABASE == sc ) sc = E_FAIL; THROW( CException( sc ) ); } // // Consider 100% of the copy work is done. // progressTracker.UpdateCopyProgress( 1,1 ); } //+------------------------------------------------------------------------- // // Member: CPhysStorage::~CPhysStorage, public // // Synopsis: closes index. // // History: 09-Mar-92 KyleP Created // // Notes: Don't write back pages. This is either a read only // index or we are aborting a merge. Pages are written // back after a successful merge using Reopen(). // //-------------------------------------------------------------------------- CPhysStorage::~CPhysStorage() { ciDebugOut(( DEB_ITRACE, "Physical index %lx closed.\n", _objectId )); _cache.Free( FALSE ); } //+------------------------------------------------------------------------- // // Member: CPhysStorage::Close, public // // Effects: Closes the stream. // // History: 07-Mar-92 KyleP Created // //-------------------------------------------------------------------------- void CPhysStorage::Close() { _cache.Free(); _stream.Free(); } //+--------------------------------------------------------------------------- // // Function: Flush // // Synopsis: Flushes all the pages that were unmapped since the last // flush. // // History: 4-29-94 srikants Created // // Notes: // //---------------------------------------------------------------------------- void CPhysStorage::Flush( BOOL fLeaveFlushFlagAlone ) { Win4Assert( _fWritable ); // Grab the lock to make sure the pages aren't deleted while // they are being flushed. if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); _cache.Flush( ULONG_MAX, fLeaveFlushFlagAlone ); } else { CReadAccess readLock( _xRWAccess.GetReference() ); _cache.Flush( ULONG_MAX, fLeaveFlushFlagAlone ); } } //Flush //+--------------------------------------------------------------------------- // // Function: ShrinkToFit // // Synopsis: Reduces the size of the stream by giving up pages in the end // which are not needed. // // Arguments: (none) // // History: 9-08-94 srikants Created // // Notes: // //---------------------------------------------------------------------------- void CPhysStorage::ShrinkToFit() { _cache.Free(); _stream->SetSize( _storage, PageToLow(_cpageUsedFileSize), PageToHigh(_cpageUsedFileSize) ); _cpageFileSize = _cpageUsedFileSize; } //+------------------------------------------------------------------------- // // Member: CPhysStorage::Reopen, public // // Synopsis: Flushes, closes, and reopens for reading. // // History: 09-Mar-92 KyleP Created // 26-Aug-92 BartoszM Separated from destructor // 06-May-94 Srikants Add fSetSize as a parameter to truncate // the stream optionally. // //-------------------------------------------------------------------------- void CPhysStorage::Reopen( BOOL fWritable ) { // No need to lock. _cache.Free(); // will flush all buffers if ( _fWritable && !_stream.IsNull() ) { // // Give it an accurate used length. // _stream->SetSize( _storage, PageToLow(_cpageUsedFileSize), PageToHigh(_cpageUsedFileSize) ); _cpageFileSize = _cpageUsedFileSize; _stream.Free(); // // reopen shadow indexes as read and master indexes as write to // support shrink from front. // _fWritable = fWritable; } // // reopen it with the new mode // ReOpenStream(); if ( _stream.IsNull() || !_stream->Ok() ) { ciDebugOut(( DEB_ERROR, "Re-Open file of index %08x failed\n", _objectId )); if ( _fThrowCorruptErrorOnFailures || _stream->FStatusFileNotFound() ) { // // We don't have code to handle such failures, hence mark // catalog as corrupt; otherwise throw e_fail // Win4Assert( !"Corrupt catalog" ); _storage.ReportCorruptComponent( L"PhysStorage3" ); THROW( CException( CI_CORRUPT_DATABASE )); } else THROW( CException( E_FAIL )); } _cpageFileSize = ToPages(_stream->SizeLow(), _stream->SizeHigh()); ciDebugOut(( DEB_ITRACE, "Physical index %08x opened.\n", _objectId )); } //Reopen //+------------------------------------------------------------------------- // // Member: CPhysStorage::LokBorrowNewBuffer, public // // Arguments: [hash] -- hash value for doing the lookup // [commonPage]] -- the common page of nPage // [nPage] -- page number // // Returns: A buffer for a new (unused) page. // // History: 03-Mar-98 dlee Created from existing BorrowNewBuffer // // Notes: On creation, the buffer is filled with zeros. // //-------------------------------------------------------------------------- ULONG * CPhysStorage::LokBorrowNewBuffer( ULONG hash, ULONG commonPage, ULONG nPage ) { CPhysBuffer* pBuf = _cache.Search( hash, commonPage ); if (pBuf) { pBuf->Reference(); Win4Assert( nPage < _cpageFileSize ); // fIntentToWrite should be TRUE pBuf->SetIntentToWrite(); } else { // If we've moved beyond the previous end of file, set the new // size of file. if ( nPage >= _cpageFileSize ) _GrowFile( nPage + _cpageGrowth ); // First try to release unreferenced buffers if the cache is full. _cache.TryToRemoveBuffers( _cMaxCachedBuffers ); pBuf = new CPhysBuffer( _stream.GetReference(), nPage, TRUE, // writable TRUE, // intent to write ! ( _fAllowReadAhead && _storage.FavorReadAhead() ) ); _cache.Add( pBuf, hash ); } Win4Assert( nPage + 1 > _cpageUsedFileSize ); _cpageUsedFileSize = nPage + 1; Win4Assert( _cpageUsedFileSize <= _cpageFileSize ); RtlZeroMemory( pBuf->GetPage( nPage ), CI_PAGE_SIZE ); return pBuf->GetPage( nPage ); } //LokBorrowNewBuffer //+------------------------------------------------------------------------- // // Member: CPhysStorage::BorrowNewBuffer, public // // Arguments: [nPage] -- page number // // Returns: A buffer for a new (unused) page. // // Signals: No more disk space. // // History: 09-Mar-92 KyleP Created // // Notes: On creation, the buffer is filled with zeros. // //-------------------------------------------------------------------------- ULONG * CPhysStorage::BorrowNewBuffer( ULONG nPage ) { Win4Assert( _fWritable ); ULONG commonPage = PgCommonPgTrunc( nPage ); ULONG hash = _cache.hash( commonPage ); // Use appropriate locking based on whether any pages are in the cache. if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); return LokBorrowNewBuffer( hash, commonPage, nPage ); } else { CWriteAccess writeLock( _xRWAccess.GetReference() ); return LokBorrowNewBuffer( hash, commonPage, nPage ); } } //BorrowNewBuffer //+------------------------------------------------------------------------- // // Member: CPhysStorage::LokBorrowOrAddBuffer, public // // Arguments: [hash] -- hash value for doing the lookup // [commonPage]] -- the common page of nPage // [nPage] -- page number // [fAdd] -- if TRUE, create the page if not found // if FALSE and not found, return 0 // [fWritable] -- if TRUE, the page is writable // [fIntentToWrite] -- TRUE if the caller intends to write // // Returns: A buffer loaded with page [nPage] // // History: 09-Mar-92 KyleP Created // //-------------------------------------------------------------------------- ULONG * CPhysStorage::LokBorrowOrAddBuffer( ULONG hash, ULONG commonPage, ULONG nPage, BOOL fAdd, BOOL fWritable, BOOL fIntentToWrite ) { // First, look in the cache. Either we haven't looked yet (if no // caching) or another thread may have added it between the time the // read lock was released and the write lock taken. Win4Assert( commonPage >= _iFirstNonShrunkPage ); CPhysBuffer * pbuf = _cache.Search( hash, commonPage ); if ( 0 != pbuf ) { Win4Assert( !fWritable || pbuf->IsWritable() ); pbuf->Reference(); if ( fIntentToWrite ) pbuf->SetIntentToWrite(); return pbuf->GetPage( nPage ); } ULONG * pulRet = 0; if ( fAdd ) { pbuf = new CPhysBuffer( _stream.GetReference(), nPage, fWritable, fIntentToWrite, ! ( _fAllowReadAhead && _storage.FavorReadAhead() ) ); _cache.Add( pbuf, hash ); pulRet = pbuf->GetPage( nPage ); // Try to release unreferenced buffers if the cache is full. _cache.TryToRemoveBuffers( _cMaxCachedBuffers ); } return pulRet; } //LokBorrowOrAddBuffer //+------------------------------------------------------------------------- // // Member: CPhysStorage::BorrowBuffer, public // // Arguments: [nPage] -- Page number of buffer to find. // // Returns: A buffer loaded with page [nPage] // // Signals: Out of memory? Buffer not found? // // History: 09-Mar-92 KyleP Created // //-------------------------------------------------------------------------- ULONG * CPhysStorage::BorrowBuffer( ULONG nPage, BOOL fWritable, BOOL fIntentToWrite ) { ULONG commonPage = PgCommonPgTrunc( nPage ); ULONG hash = _cache.hash( commonPage ); Win4Assert( fWritable || !fIntentToWrite ); // Make sure we didn't walk off the end. if ( nPage >= _cpageFileSize ) { ciDebugOut(( DEB_WARN, "Asking for page %d, file size %d pages\n", nPage, _cpageFileSize )); Win4Assert( !"BorrowBuffer walked off end of file" ); _storage.ReportCorruptComponent( L"PhysStorage4" ); THROW( CException( CI_CORRUPT_DATABASE ) ); } // If caching, try finding it in the cache first under a read lock // This is the fast path for when the entire property cache is in memory. if ( 0 != _cMaxCachedBuffers ) { CReadAccess readLock( _xRWAccess.GetReference() ); ULONG * p = LokBorrowOrAddBuffer( hash, commonPage, nPage, FALSE, fWritable, fIntentToWrite ); if ( 0 != p ) return p; } // Ok, maybe we have to add it. if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); return LokBorrowOrAddBuffer( hash, commonPage, nPage, TRUE, fWritable, fIntentToWrite ); } else { CWriteAccess writeLock( _xRWAccess.GetReference() ); return LokBorrowOrAddBuffer( hash, commonPage, nPage, TRUE, fWritable, fIntentToWrite ); } } //BorrowBuffer //+------------------------------------------------------------------------- // // Member: CPhysStorage::ReturnBuffer, public // // Synopsis: Dereference and return the buffer to the pool. // // Arguments: [nPage] -- Page number of buffer being returned. // [fFlush] -- TRUE if the buffer should be flushed if this // is the last reference to the buffer. // [fFailFlush] -- TRUE if an exception should be raised if // the flush fails. Note that even if fFlush // is FALSE, the buffer may still be flushed // because previously it was borrowed with // intent to write. // // Notes: If flush throws, this call doesn't return the buffer. // // History: 16-Mar-93 BartoszM Created // //-------------------------------------------------------------------------- void CPhysStorage::ReturnBuffer( ULONG nPage, BOOL fFlush, BOOL fFailFlush ) { ULONG commonPage = PgCommonPgTrunc( nPage ); ULONG hash = _cache.hash( commonPage ); // if caching is off, grab the write lock, else the read lock if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); Win4Assert( commonPage >= _iFirstNonShrunkPage ); CPhysBuffer *pbuf = _cache.Search( hash, commonPage ); Win4Assert( 0 != pbuf ); Win4Assert( pbuf->IsReferenced() ); // If the refcount is 1, it's about to be destroyed. Do the Flush // now, in case it fails, before mucking with any data structures. BOOL fDestroy = pbuf->IsRefCountOne(); if ( fDestroy && fFlush ) { Win4Assert( pbuf->IsWritable() ); pbuf->Flush( fFailFlush ); } pbuf->DeReference( _usnGen++ ); if ( fDestroy ) { Win4Assert( !pbuf->IsReferenced() ); _cache.Destroy( nPage, fFailFlush ); Win4Assert( !_cache.Search( hash, commonPage ) ); } } else { CReadAccess readLock( _xRWAccess.GetReference() ); Win4Assert( commonPage >= _iFirstNonShrunkPage ); CPhysBuffer *pbuf = _cache.Search( hash, commonPage ); Win4Assert( 0 != pbuf ); Win4Assert( pbuf->IsReferenced() ); if ( fFlush ) { Win4Assert( pbuf->IsWritable() ); if ( pbuf->IsRefCountOne() ) pbuf->Flush( fFailFlush ); } pbuf->DeReference( _usnGen++ ); // leave it in the cache -- it'll be cleared out by BorrowBuffer } } //ReturnBuffer //+------------------------------------------------------------------------- // // Member: CPhysStorage::RequiresFlush, public // // Synopsis: Determines if the page is scheduled for flushing // // Arguments: [nPage] -- Page number to check // // Returns: TRUE if the buffer will be flushed if Flush or Destroy is // called. // // History: 3-Nov-98 dlee Created // //-------------------------------------------------------------------------- BOOL CPhysStorage::RequiresFlush( ULONG nPage ) { ULONG commonPage = PgCommonPgTrunc( nPage ); ULONG hash = _cache.hash( commonPage ); // if caching is off, grab the write lock, else the read lock if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); Win4Assert( commonPage >= _iFirstNonShrunkPage ); CPhysBuffer *pbuf = _cache.Search( hash, commonPage ); Win4Assert( 0 != pbuf ); Win4Assert( pbuf->IsReferenced() ); return pbuf->RequiresFlush(); } else { CReadAccess readLock( _xRWAccess.GetReference() ); Win4Assert( commonPage >= _iFirstNonShrunkPage ); CPhysBuffer *pbuf = _cache.Search( hash, commonPage ); Win4Assert( 0 != pbuf ); Win4Assert( pbuf->IsReferenced() ); return pbuf->RequiresFlush(); } } //RequiresFlush //+------------------------------------------------------------------------- // // Member: CPhysStorage::_GrowFile, private // // Synopsis: Increases the physical (disk) size of the file. // // Arguments: [cpageSize] -- New file size, in pages. // // Signals: Out of space. // // History: 09-Mar-92 KyleP Created // //-------------------------------------------------------------------------- void CPhysStorage::_GrowFile( ULONG cpageSize ) { Win4Assert( cpageSize > 0 ); cpageSize = PgCommonPgRound(cpageSize); ciDebugOut(( DEB_ITRACE, " Growing Index to %d pages\n", cpageSize )); _stream->SetSize( _storage, PageToLow(cpageSize), PageToHigh(cpageSize) ); if (!_stream->Ok()) { ciDebugOut(( DEB_ERROR, "GrowFile of index %08x failed: %d\n", _objectId )); if ( _fThrowCorruptErrorOnFailures ) { // // We don't have code to handle such failures, hence mark // catalog as corrupt; otherwise throw e_fail // Win4Assert( !"Corrupt catalog" ); _storage.ReportCorruptComponent( L"PhysStorage5" ); THROW( CException( CI_CORRUPT_DATABASE ) ); } else THROW( CException( E_FAIL ) ); } _cpageFileSize = cpageSize; } //_GrowFile //+------------------------------------------------------------------------- // // Member: CPhysStorage::ShrinkFromFront, public // // Synopsis: Makes the front part of a file sparse // // Arguments: [iFirstPage] -- first 4k page -- 64k granular // [cPages] -- number of 4k pages // // Returns: The # of 4k pages actually shrunk, maybe 0 // // History: 09-Jan-97 dlee Moved from .hxx // //-------------------------------------------------------------------------- ULONG CPhysStorage::ShrinkFromFront( ULONG iFirstPage, ULONG cPages ) { ULONG cShrunk = 0; if ( _storage.SupportsShrinkFromFront() ) { // // Make sure the caller isn't leaving any gaps and was paying // attention to the return value from previous calls. // Win4Assert( iFirstPage == _iFirstNonShrunkPage ); // // We must shrink on common page boundaries since we borrow on // common pages (even though the api is page granular) // ULONG cPagesToShrink = PgCommonPgTrunc( cPages ); if ( 0 == cPagesToShrink ) return 0; Win4Assert( _iFirstNonShrunkPage == PgCommonPgTrunc( _iFirstNonShrunkPage ) ); Win4Assert( iFirstPage == PgCommonPgTrunc( iFirstPage ) ); // Take a lock so no one else tries to borrow or free any pages Win4Assert ( 0 == _cMaxCachedBuffers ); CLock lock( _xMutex.GetReference() ); cShrunk = _stream->ShrinkFromFront( iFirstPage, cPagesToShrink ); Win4Assert( cShrunk == PgCommonPgTrunc( cShrunk ) ); _iFirstNonShrunkPage += cShrunk; } return cShrunk; } //ShrinkFromFront //+------------------------------------------------------------------------- // // Member: CPhysStorage::MinPageInUse, public // // Synopsis: Finds the smallest page in use within the cache // // Arguments: [minPage] -- returns the result // // Returns : TRUE if any page is in the cache; FALSE o/w // If TRUE is returned, then minPage will contain the // minimum page that is present in the cache. // // History: 26-Mar-98 dlee Moved from .hxx // //-------------------------------------------------------------------------- BOOL CPhysStorage::MinPageInUse( ULONG &minPage ) { if ( 0 == _cMaxCachedBuffers ) { CLock lock( _xMutex.GetReference() ); return _cache.MinPageInUse(minPage); } else { CReadAccess readLock( _xRWAccess.GetReference() ); return _cache.MinPageInUse(minPage); } } //MinPageInUse