136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1991 - 1998
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//
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// File: dellog.hxx
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//
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// Contents: Deletion logs for usns
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//
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// History: 28-Jul-97 SitaramR Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <dynstrm.hxx>
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#include "usnlist.hxx"
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//+-------------------------------------------------------------------------
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//
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// Class: CDelLogEntry
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//
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// Purpose: Entry in deletion log list
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//
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// History: 28-Jul-97 SitaramR Created
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//
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//--------------------------------------------------------------------------
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class CDelLogEntry : public CDoubleLink
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{
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public:
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CDelLogEntry( FILEID fileId, WORKID wid, USN usn )
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: _fileId(fileId),
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_wid(wid),
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_usn(usn)
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{
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}
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FILEID FileId() { return _fileId; }
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WORKID WorkId() { return _wid; }
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USN Usn() { return _usn; }
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private:
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FILEID _fileId;
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WORKID _wid;
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USN _usn;
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};
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typedef class TDoubleList<CDelLogEntry> CDelLogEntryList;
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typedef class TFwdListIter<CDelLogEntry, CDelLogEntryList> CDelLogEntryListIter;
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//+-------------------------------------------------------------------------
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//
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// Class: CFakeVolIdMap
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//
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// Purpose: Maps volume ids to fake volume ids in the range
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// 0..RTL_MAX_DRIVE_LETTERS-1
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//
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// History: 28-Jul-97 SitaramR Created
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//
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//--------------------------------------------------------------------------
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const VOLUMEID VolumeIdBase = L'a'; // For mapping 'a' to 'z' volume ids
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const COUNT_ALPHABETS = 26; // # letters in alphabet
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const COUNT_SPECIAL_CHARS = RTL_MAX_DRIVE_LETTERS - 26; // Count of non 'a' to 'z' drives
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class CFakeVolIdMap
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{
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public:
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CFakeVolIdMap();
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ULONG VolIdToFakeVolId( VOLUMEID volumeId );
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VOLUMEID FakeVolIdToVolId( ULONG fakeVolId );
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private:
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VOLUMEID _aVolIdSpecial[COUNT_SPECIAL_CHARS]; // Mapping for non 'a' to 'z' drives
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};
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class CFileIdMap;
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class CiCat;
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class CiStorage;
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//+-------------------------------------------------------------------------
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//
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// Class: CDeletionLog
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//
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// Purpose: Deletion log for keeping track of usn deletions until they
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// are no longer needed.
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//
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// History: 28-Jul-97 SitaramR Created
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//
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//--------------------------------------------------------------------------
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class CDeletionLog
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{
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public:
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CDeletionLog( CFileIdMap& fileIdMap, CiCat& cicat );
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void FastInit( CiStorage * pStorage, ULONG version );
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void ReInit( ULONG version );
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void Flush();
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void MarkForDeletion( VOLUMEID volumeId,
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FILEID fileId,
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WORKID wid,
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USN usn );
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void ProcessChangesFlush( CUsnFlushInfoList & usnFlushInfoList );
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private:
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ULONG GetSize();
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void FatalCorruption( ULONG cbRead, ULONG cbToRead );
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CiCat& _cicat; // Ci catalog
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CFileIdMap & _fileIdMap; // File id map
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CFakeVolIdMap _fakeVolIdMap; // Real vol id to fake vol id map
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CDelLogEntryList _aDelLogEntryList[RTL_MAX_DRIVE_LETTERS]; // List of marked deletions
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XPtr<CDynStream> _xPersStream; // Persistent linearized deletion log
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CMutexSem _mutex; // Lock to serialize scan(flush) and usn threads
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};
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