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1148 lines
30 KiB
1148 lines
30 KiB
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: page.cxx
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//
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// Contents: Paging code for MSF
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//
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// Classes: Defined in page.hxx
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//
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// Functions:
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//
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// History: 20-Oct-92 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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#include "msfhead.cxx"
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#pragma hdrstop
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#include <mread.hxx>
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#include <filest.hxx>
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#define FLUSH_MULTIPLE
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPage::SetSect, public
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//
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// Synopsis: Sets the SECT for this page
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//
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// History: 20-Oct-92 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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#ifdef SORTPAGETABLE
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inline void CMSFPage::SetSect(const SECT sect)
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{
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msfAssert(_pmpNext != NULL && _pmpPrev != NULL);
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msfAssert((_pmpPrev->_sect >= _pmpNext->_sect) || //Edge
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((_sect >= _pmpPrev->_sect) && (_sect <= _pmpNext->_sect)));
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_sect = sect;
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}
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#endif
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::IsSorted, public
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//
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// Synopsis: Return TRUE if the specified page is in the right place
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// in the list.
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//
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// Arguments: [pmp] -- Page to check
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//
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// History: 13-Dec-95 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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inline BOOL CMSFPageTable::IsSorted(CMSFPage *pmp)
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{
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//There are three cases:
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//1) Page is first in the list.
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//2) Page is last in the list.
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//3) Page is in the middle of the list.
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SECT sect = pmp->GetSect();
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CMSFPage *pmpStart = BP_TO_P(CMSFPage *, _pmpStart);
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CMSFPage *pmpNext = pmp->GetNext();
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if (pmp == pmpStart)
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{
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return (sect <= pmpNext->GetSect());
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}
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if (pmpNext == pmpStart)
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{
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return (sect >= pmp->GetPrev()->GetSect());
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}
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return ((sect <= pmpNext->GetSect()) &&
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(sect >= pmp->GetPrev()->GetSect()));
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::SetSect, public
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//
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// Synopsis: Set the sector stamp on a page, and sort the list if
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// necessary.
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//
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// Arguments: [pmp] -- Pointer to page to stamp
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// [sect] -- SECT to stamp it with
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//
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// Returns: void
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//
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// History: 12-Dec-95 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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void CMSFPageTable::SetSect(CMSFPage *pmp, SECT sect)
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{
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msfDebugOut((DEB_ITRACE, "In CMSFPageTable::SetSect:%p(%p, %lX)\n",
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this,
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pmp,
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sect));
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pmp->SetSect(sect);
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//Resort list if necessary.
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if (!IsSorted(pmp))
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{
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CMSFPage *pmpTemp, *pmpStart;
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pmpStart = BP_TO_P(CMSFPage *, _pmpStart);
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if (pmpStart == pmp)
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{
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pmpStart = pmp->GetNext();
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_pmpStart = P_TO_BP(CBasedMSFPagePtr , pmpStart);
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}
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pmp->Remove();
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pmpTemp = pmpStart;
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while (sect > pmpTemp->GetSect())
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{
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pmpTemp = pmpTemp->GetNext();
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if (pmpTemp == pmpStart)
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{
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break;
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}
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}
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//Insert node before pmpTemp.
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pmpTemp->GetPrev()->SetNext(pmp);
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pmp->SetChain(pmpTemp->GetPrev(), pmpTemp);
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pmpTemp->SetPrev(pmp);
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if (sect <= pmpStart->GetSect())
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{
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_pmpStart = P_TO_BP(CBasedMSFPagePtr, pmp);
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}
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}
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msfAssert(IsSorted(pmp));
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msfDebugOut((DEB_ITRACE, "Out CMSFPageTable::SetSect\n"));
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::CMSFPageTable, public
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//
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// Synopsis: CMSFPageTable constructor.
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//
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// Arguments: [pmsParent] -- Pointer to multistream for this page table.
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//
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// History: 22-Oct-92 PhilipLa Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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CMSFPageTable::CMSFPageTable(
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CMStream *const pmsParent,
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const ULONG cMinPages,
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const ULONG cMaxPages)
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: _cbSector(pmsParent->GetSectorSize()),
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_cMinPages(cMinPages), _cMaxPages(cMaxPages)
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{
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_pmsParent = P_TO_BP(CBasedMStreamPtr, pmsParent);
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_cActivePages = 0;
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_cPages = 0;
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_pmpCurrent = NULL;
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#ifdef SORTPAGETABLE
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_pmpStart = NULL;
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#endif
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_cReferences = 1;
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#if DBG == 1
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_cCurrentPageRef = 0;
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_cMaxPageRef = 0;
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#endif
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPage::CMSFPage, public
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//
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// Synopsis: CMSFPage default constructor
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//
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// History: 20-Oct-92 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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#if DBG == 1
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CMSFPage::CMSFPage(CMSFPage *pmp, CMSFPageTable *pmpt)
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#else
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CMSFPage::CMSFPage(CMSFPage *pmp)
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#endif
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{
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if (pmp == NULL)
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{
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SetChain(this, this);
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}
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else
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{
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SetChain(pmp->GetPrev(), pmp);
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GetPrev()->SetNext(this);
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GetNext()->SetPrev(this);
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}
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#if DBG == 1
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_pmpt = P_TO_BP(CBasedMSFPageTablePtr, pmpt);
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#endif
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SetSid(NOSTREAM);
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SetOffset(0);
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// SetSect(ENDOFCHAIN);
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//SetSect() contains assertions to verify sortedness of the list,
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//which we don't want here.
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_sect = ENDOFCHAIN;
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SetFlags(0);
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SetVector(NULL);
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_cReferences = 0;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::GetNewPage, private
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//
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// Synopsis: Insert a new page into the list and return a pointer to it.
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//
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// Arguments: None.
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//
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// Returns: Pointer to new page. Null if there was an allocation error.
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//
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// History: 22-Oct-92 PhilipLa Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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inline CMSFPage * CMSFPageTable::GetNewPage(void)
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{
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#ifndef SORTPAGETABLE
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#if DBG == 1
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return new (_pmsParent->GetMalloc(), (size_t)_cbSector)
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CMSFPage(BP_TO_P(CMSFPage *, _pmpCurrent), this);
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#else
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return new (_pmsParent->GetMalloc(), (size_t)_cbSector)
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CMSFPage(BP_TO_P(CMSFPage *, _pmpCurrent));
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#endif
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#else
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#if DBG == 1
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return new (_pmsParent->GetMalloc(), (size_t)_cbSector)
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CMSFPage(BP_TO_P(CMSFPage *, _pmpStart), this);
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#else
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return new (_pmsParent->GetMalloc(), (size_t)_cbSector)
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CMSFPage(BP_TO_P(CMSFPage *, _pmpStart));
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#endif
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#endif //SORTPAGETABLE
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::~CMSFPageTable, public
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//
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// Synopsis: CMSFPageTable destructor
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//
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// History: 26-Oct-92 PhilipLa Created
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// 21-Jul-95 SusiA Modified to delete the object without
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// obtaining the mutex. Calling functions
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// should have locked the mutex first.
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//
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//----------------------------------------------------------------------------
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CMSFPageTable::~CMSFPageTable()
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{
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if (_pmpCurrent != NULL)
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{
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CMSFPage *pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
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CMSFPage *pmpNext;
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while (pmp != pmp->GetNext())
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{
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pmpNext = pmp->GetNext();
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msfAssert(pmpNext != NULL &&
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aMsg("NULL found in page table circular list."));
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#if DBG == 1
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msfAssert(!pmp->IsInUse() &&
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aMsg("Active page left at page table destruct time."));
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if (!_pmsParent->IsScratch())
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{
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//Dirty paged can be thrown away if we are unconverted or
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// in a commit.
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if ((!_pmsParent->IsUnconverted()) &&
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(_pmsParent->GetParentSize() == 0))
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{
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msfAssert(!pmp->IsDirty() &&
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aMsg("Dirty page left at page table destruct time."));
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}
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}
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#endif
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pmp->~CMSFPage();
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pmp->deleteNoMutex(pmp);
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pmp = pmpNext;
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}
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pmp->~CMSFPage();
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pmp->deleteNoMutex(pmp);
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}
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#if DBG == 1
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msfDebugOut((DEB_ITRACE,
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"Page Table Max Page Count for %s: %lu\n",
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(_pmsParent->IsScratch()) ? "Scratch" : "Base",
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_cMaxPageRef));
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#endif
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::Init, public
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//
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// Synopsis: Initialize a CMSFPageTable
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//
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// Arguments: [cPages] -- Number of pages to preallocate.
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//
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// Returns: Appropriate status code
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//
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// History: 22-Oct-92 PhilipLa Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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SCODE CMSFPageTable::Init(void)
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{
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SCODE sc = S_OK;
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msfDebugOut((DEB_ITRACE, "In CMSFPageTable::Init:%p()\n", this));
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for (ULONG i = 0; i < _cMinPages; i++)
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{
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CMSFPage *pmp;
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msfMem(pmp = GetNewPage());
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#ifndef SORTPAGETABLE
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_pmpCurrent = P_TO_BP(CBasedMSFPagePtr, pmp);
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#else
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_pmpStart = P_TO_BP(CBasedMSFPagePtr, pmp);
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#endif
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}
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_cPages = _cMinPages;
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_cActivePages = 0;
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#ifdef SORTPAGETABLE
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_pmpCurrent = _pmpStart;
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#endif
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msfDebugOut((DEB_ITRACE, "Out CMSFPageTable::Init\n"));
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Err:
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return sc;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::FlushPage, public
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//
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// Synopsis: Flush a page
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//
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// Arguments: [pmp] -- Pointer to page to flush
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//
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// Returns: Appropriate status code
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//
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// History: 09-Nov-92 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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SCODE CMSFPageTable::FlushPage(CMSFPage *pmp)
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{
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SCODE sc = S_OK;
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pmp->AddRef();
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CMStream *pms;
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pms = pmp->GetVector()->GetParent();
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//Flush the page, reset the dirty bit.
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msfAssert((pmp->GetSect() != ENDOFCHAIN) &&
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aMsg("Page location not set - don't know where to flush to."));
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msfAssert (pms != NULL);
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ULONG ulRet;
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ILockBytes *pilb;
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#if DBG == 1
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if ((pmp->GetSid() == SIDFAT) && (pms->IsInCOW()))
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{
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msfDebugOut((DEB_ITRACE, "** Fat sect %lu written to %lX\n",
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pmp->GetOffset(), pmp->GetSect()));
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}
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if ((pmp->GetSid() == SIDDIF) && (pms->IsInCOW()))
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{
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msfDebugOut((DEB_ITRACE, "** DIF sect %lu written to %lX\n",
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pmp->GetOffset(), pmp->GetSect()));
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}
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#endif
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ULARGE_INTEGER ul;
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#ifdef LARGE_DOCFILE
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ul.QuadPart = ConvertSectOffset(
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pmp->GetSect(),
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0,
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pms->GetSectorShift());
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#else
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ULISet32(ul, ConvertSectOffset(
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pmp->GetSect(),
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0,
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pms->GetSectorShift()));
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#endif
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pilb = pms->GetILB();
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msfAssert(!pms->IsUnconverted() &&
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aMsg("Tried to flush page to unconverted base."));
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sc = GetScode(pilb->WriteAt(ul,
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(BYTE *)(pmp->GetData()),
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_cbSector,
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&ulRet));
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if (sc == E_PENDING)
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{
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sc = STG_E_PENDINGCONTROL;
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}
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msfChk(sc);
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pmp->ResetDirty();
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Err:
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pmp->Release();
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return sc;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CMSFPageTable::GetFreePage, public
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//
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// Synopsis: Return a pointer to a free page.
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//
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// Arguments: [ppmp] -- Pointer to storage for return pointer
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//
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// Returns: Appropriate status code
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//
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// History: 22-Oct-92 PhilipLa Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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SCODE CMSFPageTable::GetFreePage(CMSFPage **ppmp)
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{
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SCODE sc = S_OK;
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CMSFPage *pmp;
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if (_cPages > _cActivePages)
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{
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//We have some unused page already allocated. Find and return it.
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pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
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do
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{
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pmp = pmp->GetNext();
|
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}
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while ((pmp != _pmpCurrent) && (pmp->GetSid() != NOSTREAM));
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|
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msfAssert((pmp->GetSid() == NOSTREAM) &&
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aMsg("Expected empty page, none found."));
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*ppmp = pmp;
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_cActivePages++;
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}
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else if (_cPages == _cMaxPages)
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{
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msfMem(pmp = FindSwapPage());
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msfDebugOut((DEB_ITRACE, "Got swap page %p\n",pmp));
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|
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msfAssert((pmp->GetVector() != NULL) &&
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aMsg("FindSwapPage returned unowned page."));
|
|
|
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msfDebugOut((DEB_ITRACE, "Freeing page %lu from vector %p\n",
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pmp->GetOffset(), pmp->GetVector()));
|
|
|
|
|
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if (pmp->IsDirty())
|
|
{
|
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msfChk(FlushPage(pmp));
|
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msfAssert(!pmp->IsDirty() &&
|
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aMsg("Page remained dirty after flush call"));
|
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}
|
|
|
|
pmp->GetVector()->FreeTable(pmp->GetOffset());
|
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#if DBG == 1
|
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pmp->SetVector(NULL);
|
|
#endif
|
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*ppmp = pmp;
|
|
}
|
|
else
|
|
{
|
|
//Create a new page and return it.
|
|
pmp = GetNewPage();
|
|
if (pmp != NULL)
|
|
{
|
|
*ppmp = pmp;
|
|
_cActivePages++;
|
|
_cPages++;
|
|
}
|
|
else
|
|
{
|
|
msfMem(pmp = FindSwapPage());
|
|
if (pmp->IsDirty())
|
|
{
|
|
msfChk(FlushPage(pmp));
|
|
msfAssert(!pmp->IsDirty() &&
|
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aMsg("Page remained dirty after flush call"));
|
|
}
|
|
if (pmp->GetVector() != NULL)
|
|
pmp->GetVector()->FreeTable(pmp->GetOffset());
|
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#if DBG == 1
|
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pmp->SetVector(NULL);
|
|
#endif
|
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*ppmp = pmp;
|
|
}
|
|
}
|
|
|
|
Err:
|
|
return sc;
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::FindPage, public
|
|
//
|
|
// Synopsis: Find and return a given page
|
|
//
|
|
// Arguments: [ppv] -- Pointer to vector of page to return
|
|
// [sid] -- SID of page to return
|
|
// [ulOffset] -- Offset of page to return
|
|
// [ppmp] -- Location to return pointer
|
|
//
|
|
// Returns: Appropriate status code
|
|
//
|
|
// History: 22-Oct-92 PhilipLa Created
|
|
//
|
|
// Notes:
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
SCODE CMSFPageTable::FindPage(
|
|
CPagedVector *ppv,
|
|
SID sid,
|
|
ULONG ulOffset,
|
|
CMSFPage **ppmp)
|
|
{
|
|
SCODE sc;
|
|
CMSFPage *pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
|
|
|
|
do
|
|
{
|
|
if ((pmp->GetVector() == ppv) && (pmp->GetOffset() == ulOffset))
|
|
{
|
|
//Bingo!
|
|
|
|
*ppmp = pmp;
|
|
return STG_S_FOUND;
|
|
}
|
|
|
|
pmp = pmp->GetNext();
|
|
}
|
|
while (pmp != _pmpCurrent);
|
|
|
|
//The page isn't currently in memory. Get a free page and
|
|
//bring it into memory.
|
|
|
|
msfChk(GetFreePage(&pmp));
|
|
|
|
msfAssert((pmp->GetVector() == NULL) &&
|
|
aMsg("Attempting to reassign owned page."));
|
|
pmp->SetVector(ppv);
|
|
pmp->SetSid(sid);
|
|
pmp->SetOffset(ulOffset);
|
|
#ifdef SORTPAGETABLE
|
|
SetSect(pmp, ENDOFCHAIN);
|
|
#else
|
|
pmp->SetSect(ENDOFCHAIN);
|
|
#endif
|
|
|
|
*ppmp = pmp;
|
|
|
|
Err:
|
|
return sc;
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::GetPage, public
|
|
//
|
|
// Synopsis: Find and return a given page
|
|
//
|
|
// Arguments: [sid] -- SID of page to return
|
|
// [ulOffset] -- Offset of page to return
|
|
// [ppmp] -- Location to return pointer
|
|
//
|
|
// Returns: Appropriate status code
|
|
//
|
|
// History: 22-Oct-92 PhilipLa Created
|
|
//
|
|
// Notes:
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
SCODE CMSFPageTable::GetPage(
|
|
CPagedVector *ppv,
|
|
SID sid,
|
|
ULONG ulOffset,
|
|
SECT sectKnown,
|
|
CMSFPage **ppmp)
|
|
{
|
|
SCODE sc;
|
|
|
|
*ppmp = NULL;
|
|
msfChk(FindPage(ppv, sid, ulOffset, ppmp));
|
|
|
|
(*ppmp)->AddRef();
|
|
|
|
if (sc != STG_S_FOUND)
|
|
{
|
|
ULONG ulRet;
|
|
SECT sect;
|
|
|
|
if (sectKnown != ENDOFCHAIN)
|
|
{
|
|
sect = sectKnown;
|
|
}
|
|
else
|
|
{
|
|
msfChk(ppv->GetParent()->GetSect(sid, ulOffset, §));
|
|
}
|
|
#ifdef SORTPAGETABLE
|
|
SetSect(*ppmp, sect);
|
|
#else
|
|
(*ppmp)->SetSect(sect);
|
|
#endif
|
|
|
|
CMStream *pms = (*ppmp)->GetVector()->GetParent();
|
|
#if DBG == 1
|
|
if ((sid == SIDFAT) && (pms->IsInCOW()))
|
|
{
|
|
msfDebugOut((DEB_ITRACE, "Fat sect %lu read from %lX\n",
|
|
ulOffset, sect));
|
|
}
|
|
if ((sid == SIDDIF) && (pms->IsInCOW()))
|
|
{
|
|
msfDebugOut((DEB_ITRACE, "DIF sect %lu read from %lX\n",
|
|
ulOffset, sect));
|
|
}
|
|
|
|
#endif
|
|
|
|
ULARGE_INTEGER ul;
|
|
#ifdef LARGE_DOCFILE
|
|
ul.QuadPart = ConvertSectOffset(
|
|
(*ppmp)->GetSect(),
|
|
0,
|
|
pms->GetSectorShift());
|
|
#else
|
|
ULISet32(ul, ConvertSectOffset(
|
|
(*ppmp)->GetSect(),
|
|
0,
|
|
pms->GetSectorShift()));
|
|
#endif
|
|
|
|
msfAssert(pms->GetILB() != NULL &&
|
|
aMsg("NULL ILockBytes - missing SetAccess?"));
|
|
|
|
sc = GetScode(pms->GetILB()->ReadAt(ul,
|
|
(BYTE *)((*ppmp)->GetData()),
|
|
_cbSector,
|
|
&ulRet));
|
|
if (sc == E_PENDING)
|
|
{
|
|
sc = STG_E_PENDINGCONTROL;
|
|
}
|
|
msfChk(sc);
|
|
|
|
if (ulRet != _cbSector)
|
|
{
|
|
// 09/23/93 - No error, but insufficient bytes read
|
|
sc = STG_E_READFAULT;
|
|
}
|
|
}
|
|
|
|
Err:
|
|
if (*ppmp != NULL)
|
|
{
|
|
if (FAILED(sc))
|
|
{
|
|
// 09/19/93 - Reset page so that we don't accidentally use it
|
|
|
|
(*ppmp)->SetSid(NOSTREAM);
|
|
(*ppmp)->SetOffset(0);
|
|
#ifdef SORTPAGETABLE
|
|
SetSect(*ppmp, ENDOFCHAIN);
|
|
#else
|
|
(*ppmp)->SetSect(ENDOFCHAIN);
|
|
#endif
|
|
(*ppmp)->SetFlags(0);
|
|
(*ppmp)->SetVector(NULL);
|
|
_cActivePages--;
|
|
}
|
|
(*ppmp)->Release();
|
|
}
|
|
|
|
return sc;
|
|
}
|
|
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::ReleasePage, public
|
|
//
|
|
// Synopsis: Release a given page
|
|
//
|
|
// Arguments: [sid] -- SID of page to release
|
|
// [ulOffset] -- Offset of page to release
|
|
//
|
|
// History: 28-Oct-92 PhilipLa Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
void CMSFPageTable::ReleasePage(CPagedVector *ppv,
|
|
SID sid, ULONG ulOffset)
|
|
{
|
|
SCODE sc;
|
|
CMSFPage *pmp;
|
|
|
|
sc = FindPage(ppv, sid, ulOffset, &pmp);
|
|
|
|
if (SUCCEEDED(sc))
|
|
{
|
|
pmp->Release();
|
|
}
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::Flush, public
|
|
//
|
|
// Synopsis: Flush dirty pages to disk
|
|
//
|
|
// Returns: Appropriate status code
|
|
//
|
|
// History: 02-Nov-92 PhilipLa Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
SCODE CMSFPageTable::Flush(void)
|
|
{
|
|
#ifndef SORTPAGETABLE
|
|
SCODE sc = S_OK;
|
|
|
|
CMSFPage *pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
|
|
|
|
//We use pmpLast in case FlushPage changes _pmpCurrent.
|
|
CMSFPage *pmpLast = pmp;
|
|
|
|
do
|
|
{
|
|
if ((pmp->IsDirty()) && !(pmp->IsInUse()) &&
|
|
!(pmp->GetVector()->GetParent()->IsScratch()))
|
|
{
|
|
msfChk(FlushPage(pmp));
|
|
}
|
|
|
|
pmp = pmp->GetNext();
|
|
|
|
}
|
|
while (pmp != pmpLast);
|
|
|
|
Err:
|
|
return sc;
|
|
#else
|
|
SCODE sc = S_OK;
|
|
msfDebugOut((DEB_ITRACE, "In CMSFPageTable::Flush()\n"));
|
|
|
|
CMSFPage *pmp;
|
|
CMSFPage *pmpStart;
|
|
BYTE *pb = NULL;
|
|
ULONG ulBufferSize = 0;
|
|
|
|
pmpStart = BP_TO_P(CMSFPage *, _pmpStart);
|
|
pmp = pmpStart;
|
|
do
|
|
{
|
|
CMSFPage *pmpFirst = NULL;
|
|
CMSFPage *pmpLast = NULL;
|
|
|
|
//Find first page that needs to be flushed.
|
|
while (!pmp->IsFlushable())
|
|
{
|
|
pmp = pmp->GetNext();
|
|
if (pmp == pmpStart)
|
|
break;
|
|
}
|
|
|
|
//If we haven't hit the end of the list, then find a contiguous
|
|
// range of pages to flush.
|
|
if (pmp->IsFlushable())
|
|
{
|
|
pmpFirst = pmp;
|
|
//Store pointer to last page in range in pmpLast.
|
|
while (pmp->IsFlushable())
|
|
{
|
|
pmpLast = pmp;
|
|
pmp = pmp->GetNext();
|
|
if (pmp->GetSect() != pmpLast->GetSect() + 1)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
//At this point, we can flush everything from pmpFirst to
|
|
// pmpLast, and they are all contiguous. pmp points to the
|
|
// next sector after the current range.
|
|
|
|
if (pmpFirst == pmpLast)
|
|
{
|
|
msfDebugOut((DEB_ITRACE,
|
|
"Flushing page to %lx\n",
|
|
pmpFirst->GetSect()));
|
|
|
|
//Only one page: Call FlushPage.
|
|
msfChk(FlushPage(pmpFirst));
|
|
}
|
|
else
|
|
{
|
|
ULONG ulWriteSize;
|
|
ULONG cSect;
|
|
CMSFPage *pmpTemp;
|
|
ULONG i;
|
|
|
|
msfDebugOut((DEB_ITRACE,
|
|
"Flushing pages from %lx to %lx\n",
|
|
pmpFirst->GetSect(),
|
|
pmpLast->GetSect()));
|
|
|
|
cSect = pmpLast->GetSect() - pmpFirst->GetSect() + 1;
|
|
ulWriteSize = cSect * _cbSector;
|
|
|
|
if (ulWriteSize > ulBufferSize)
|
|
{
|
|
delete [] pb;
|
|
pb = new BYTE[ulWriteSize];
|
|
ulBufferSize = ulWriteSize;
|
|
}
|
|
|
|
pmpTemp = pmpFirst;
|
|
if (pb == NULL)
|
|
{
|
|
ulBufferSize = 0;
|
|
|
|
//Low memory case - write out pages one at a time
|
|
for (i = 0; i < cSect; i++)
|
|
{
|
|
msfChk(FlushPage(pmpTemp));
|
|
pmpTemp = pmpTemp->GetNext();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (i = 0; i < cSect; i++)
|
|
{
|
|
memcpy(pb + (i * _cbSector),
|
|
pmpTemp->GetData(),
|
|
_cbSector);
|
|
pmpTemp = pmpTemp->GetNext();
|
|
}
|
|
//The buffer is loaded up - now write it out.
|
|
ULARGE_INTEGER ul;
|
|
ULONG cbWritten;
|
|
ULONG cbTotal = 0;
|
|
BYTE *pbCurrent = pb;
|
|
#ifdef LARGE_DOCFILE
|
|
ul.QuadPart = ConvertSectOffset(pmpFirst->GetSect(),
|
|
0,
|
|
_pmsParent->GetSectorShift());
|
|
#else
|
|
ULISet32(ul, ConvertSectOffset(pmpFirst->GetSect(),
|
|
0,
|
|
_pmsParent->GetSectorShift()));
|
|
#endif
|
|
while (cbTotal < ulWriteSize)
|
|
{
|
|
sc = _pmsParent->GetILB()->WriteAt(ul,
|
|
pbCurrent,
|
|
ulWriteSize - cbTotal,
|
|
&cbWritten);
|
|
if (sc == E_PENDING)
|
|
{
|
|
sc = STG_E_PENDINGCONTROL;
|
|
}
|
|
msfChk(sc);
|
|
if (cbWritten == 0)
|
|
{
|
|
msfErr(Err, STG_E_WRITEFAULT);
|
|
}
|
|
cbTotal += cbWritten;
|
|
pbCurrent += cbWritten;
|
|
ul.QuadPart += cbWritten;
|
|
}
|
|
|
|
//Mark all the pages as clean.
|
|
pmpTemp = pmpFirst;
|
|
for (i = 0; i < cSect; i++)
|
|
{
|
|
pmpTemp->ResetDirty();
|
|
pmpTemp = pmpTemp->GetNext();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//We've hit the end of the list, do nothing.
|
|
}
|
|
}
|
|
while (pmp != pmpStart);
|
|
msfDebugOut((DEB_ITRACE, "Out CMSFPageTable::Flush() => %lX\n", sc));
|
|
Err:
|
|
if (pb != NULL)
|
|
{
|
|
delete [] pb;
|
|
}
|
|
return sc;
|
|
#endif //SORTPAGETABLE
|
|
}
|
|
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::FreePages, public
|
|
//
|
|
// Synopsis: Free all the pages associated with a vector.
|
|
//
|
|
// Arguments: [ppv] -- Pointer to vector to free pages for.
|
|
//
|
|
// History: 09-Nov-92 PhilipLa Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
void CMSFPageTable::FreePages(CPagedVector *ppv)
|
|
{
|
|
CMSFPage *pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
|
|
|
|
do
|
|
{
|
|
if (pmp->GetVector() == ppv)
|
|
{
|
|
pmp->SetSid(NOSTREAM);
|
|
pmp->SetVector(NULL);
|
|
pmp->ResetDirty();
|
|
_cActivePages--;
|
|
}
|
|
pmp = pmp->GetNext();
|
|
}
|
|
while (pmp != _pmpCurrent);
|
|
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::FindSwapPage, private
|
|
//
|
|
// Synopsis: Find a page to swap out.
|
|
//
|
|
// Arguments: None.
|
|
//
|
|
// Returns: Pointer to page to swap out.
|
|
//
|
|
// History: 22-Oct-92 PhilipLa Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
CMSFPage * CMSFPageTable::FindSwapPage(void)
|
|
{
|
|
#if DBG == 1
|
|
ULONG cpInUse = 0;
|
|
#endif
|
|
|
|
while (TRUE)
|
|
{
|
|
if (!_pmpCurrent->IsInUse())
|
|
{
|
|
DWORD dwFlags;
|
|
|
|
dwFlags = _pmpCurrent->GetFlags();
|
|
_pmpCurrent->SetFlags(dwFlags & ~FB_TOUCHED);
|
|
|
|
CMSFPage *pmpTemp = _pmpCurrent->GetNext();
|
|
_pmpCurrent = P_TO_BP(CBasedMSFPagePtr, pmpTemp);
|
|
|
|
if (!(dwFlags & FB_TOUCHED))
|
|
{
|
|
return _pmpCurrent->GetPrev();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
CMSFPage *pmpTemp = _pmpCurrent->GetNext();
|
|
_pmpCurrent = P_TO_BP(CBasedMSFPagePtr, pmpTemp);
|
|
}
|
|
#if DBG == 1
|
|
cpInUse++;
|
|
msfAssert((cpInUse < 3 * _cPages) &&
|
|
aMsg("No swappable pages."));
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CMSFPageTable::CopyPage, public
|
|
//
|
|
// Synopsis: Copy a page in memory, returning NULL if there is
|
|
// insufficient space for a new page without swapping.
|
|
//
|
|
// Arguments: [ppv] -- Pointer to vector that will own the copy.
|
|
// [pmpOld] -- Pointer to page to copy.
|
|
// [ppmp] -- Pointer to return value
|
|
//
|
|
// Returns: Appropriate status code
|
|
//
|
|
// Modifies:
|
|
//
|
|
// History: 04-Dec-92 PhilipLa Created
|
|
//
|
|
// Notes:
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
SCODE CMSFPageTable::CopyPage(
|
|
CPagedVector *ppv,
|
|
CMSFPage *pmpOld,
|
|
CBasedMSFPagePtr *ppmp)
|
|
{
|
|
CMSFPage *pmp;
|
|
|
|
pmp = NULL;
|
|
|
|
if (pmpOld != NULL)
|
|
{
|
|
msfAssert(!pmpOld->IsDirty() &&
|
|
aMsg("Copying dirty page."));
|
|
|
|
if (_cPages > _cActivePages)
|
|
{
|
|
|
|
//We have some unused page already allocated. Find and return it.
|
|
pmp = BP_TO_P(CMSFPage *, _pmpCurrent);
|
|
|
|
do
|
|
{
|
|
pmp = pmp->GetNext();
|
|
}
|
|
while ((pmp != _pmpCurrent) && (pmp->GetSid() != NOSTREAM));
|
|
|
|
|
|
msfAssert((pmp->GetSid() == NOSTREAM) &&
|
|
aMsg("Expected empty page, none found."));
|
|
_cActivePages++;
|
|
|
|
}
|
|
else if (_cPages < _cMaxPages)
|
|
{
|
|
//Create a new page and return it.
|
|
pmp = GetNewPage();
|
|
if (pmp != NULL)
|
|
{
|
|
_cActivePages++;
|
|
_cPages++;
|
|
}
|
|
}
|
|
|
|
if (pmp != NULL)
|
|
{
|
|
msfAssert((pmp->GetVector() == NULL) &&
|
|
aMsg("Attempting to reassign owned page."));
|
|
pmp->SetVector(ppv);
|
|
pmp->SetSid(pmpOld->GetSid());
|
|
pmp->SetOffset(pmpOld->GetOffset());
|
|
#ifdef SORTPAGETABLE
|
|
SetSect(pmp, pmpOld->GetSect());
|
|
#else
|
|
pmp->SetSect(pmpOld->GetSect());
|
|
#endif
|
|
|
|
memcpy(pmp->GetData(), pmpOld->GetData(), (USHORT)_cbSector);
|
|
}
|
|
}
|
|
|
|
*ppmp = P_TO_BP(CBasedMSFPagePtr, pmp);
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
|
|
#if DBG == 1
|
|
|
|
void CMSFPageTable::AddPageRef(void)
|
|
{
|
|
msfAssert((LONG) _cCurrentPageRef >= 0);
|
|
_cCurrentPageRef++;
|
|
if (_cCurrentPageRef > _cMaxPageRef)
|
|
{
|
|
_cMaxPageRef = _cCurrentPageRef;
|
|
}
|
|
}
|
|
|
|
void CMSFPageTable::ReleasePageRef(void)
|
|
{
|
|
_cCurrentPageRef--;
|
|
msfAssert((LONG) _cCurrentPageRef >= 0);
|
|
}
|
|
#endif
|