315 lines
8.6 KiB
C
315 lines
8.6 KiB
C
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#include <stdlib.h> /* for _MAX_PATH */
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#include <time.h>
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#pragma pack(1)
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extern BOOL fLGIgnoreVersion;
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extern BOOL fBackupInProgress;
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extern CHAR szDrive[];
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extern CHAR szDir[];
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extern CHAR szExt[];
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extern CHAR szFName[];
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extern CHAR szLogName[];
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extern CHAR *szLogCurrent;
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extern CHAR szLogFilePath[];
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//extern BOOL fDoNotOverWriteLogFilePath; /* do not load log file path from log file */
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extern CHAR szRestorePath[];
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extern CHAR szRecovery[];
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extern CHAR szNewDestination[];
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extern LONG cbSec; // minimum disk Read/Write unit.
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extern LONG csecHeader;
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#define cbMaxLogFileName (8 + 1 + 3 + 1) /* null at the end */
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#define PbSecAligned(pb) ((((pb)-pbLGBufMin) / cbSec) * cbSec + pbLGBufMin)
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//------ types ----------------------------------------------------------
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#define FSameTime( ptm1, ptm2 ) (memcmp((ptm1), (ptm2), sizeof(LOGTIME)) == 0)
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VOID LGGetDateTime( LOGTIME *plogtm );
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// UNDONE: allow larger attach sizes to support greater number of
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// attached databases.
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#define cbLogFileHeader 4096 // big enough to hold cbAttach
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#define cbCheckpoint 4096 // big enough to hold cbAttach
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#define cbAttach 2048
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#define cbLGMSOverhead ( sizeof( LRMS ) + sizeof( LRTYP ) )
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/* log file header
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/**/
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typedef struct
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{
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ULONG ulChecksum; // must be the first 4 bytes
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LONG lGeneration; // current log generation.
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/* log consistency check
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/**/
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LOGTIME tmCreate; // date time log file creation
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LOGTIME tmPrevGen; // date time prev log file creation
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ULONG ulMajor; // major version number
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ULONG ulMinor; // minor version number
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ULONG ulUpdate; // update version number
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LONG cbSec;
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LONG csecLGFile; // log file size.
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SIGNATURE signLog; // log gene
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/* run-time evironment
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/**/
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DBMS_PARAM dbms_param;
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} LGFILEHDR_FIXED;
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typedef struct
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{
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LGFILEHDR_FIXED;
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/* run-time environment
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/**/
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BYTE rgbAttach[cbAttach];
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/* padding to cbSec
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/**/
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BYTE rgb[cbLogFileHeader - sizeof(LGFILEHDR_FIXED) - cbAttach];
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} LGFILEHDR;
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typedef struct
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{
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ULONG ulChecksum;
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LGPOS lgposLastFullBackupCheckpoint; // checkpoint of last full backup
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LGPOS lgposCheckpoint;
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SIGNATURE signLog; // log gene
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DBMS_PARAM dbms_param;
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/* debug fields
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/**/
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LGPOS lgposFullBackup;
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LOGTIME logtimeFullBackup;
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LGPOS lgposIncBackup;
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LOGTIME logtimeIncBackup;
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} CHECKPOINT_FIXED;
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typedef struct
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{
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CHECKPOINT_FIXED;
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/* run-time environment
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/**/
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BYTE rgbAttach[cbAttach];
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/* padding to cbSec
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/**/
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BYTE rgb[cbCheckpoint - sizeof(CHECKPOINT_FIXED) - cbAttach];
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} CHECKPOINT;
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typedef struct tagLGSTATUSINFO
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{
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ULONG cSectorsSoFar; // Sectors already processed in current gen.
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ULONG cSectorsExpected; // Sectors expected in current generation.
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ULONG cGensSoFar; // Generations already processed.
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ULONG cGensExpected; // Generations expected.
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BOOL fCountingSectors; // Are we counting bytes as well as generations?
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JET_PFNSTATUS pfnStatus; // Status callback function.
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JET_SNPROG snprog; // Progress notification structure.
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} LGSTATUSINFO;
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typedef struct _rstmap
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{
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CHAR *szDatabaseName;
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CHAR *szNewDatabaseName;
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CHAR *szGenericName;
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CHAR *szPatchPath;
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BOOL fPatched;
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BOOL fDestDBReady; /* non-ext-restore, dest db copied? */
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} RSTMAP;
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#pragma pack()
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//------ variables ----------------------------------------------------------
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/****** globals declared in log.c, shared by logapi.c redo.c *******/
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/*** checkpoint file infor ***/
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extern CHECKPOINT *pcheckpointGlobal;
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/*** log file infor ***/
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extern HANDLE hfLog; /* logfile handle */
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extern INT csecLGFile;
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extern LGFILEHDR *plgfilehdrGlobal; /* cached current log file header */
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extern LGFILEHDR *plgfilehdrGlobalT; /* read cached of log file header */
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/*** in memory log buffer ***/
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extern INT csecLGBuf; /* available buffer, exclude the shadow sec */
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extern CHAR *pbLGBufMin;
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extern CHAR *pbLGBufMax;
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extern BYTE *pbLGFileEnd;
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extern LONG isecLGFileEnd;
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extern CHAR *pbLastMSFlush; /* to LGBuf where last multi-sec flush LogRec sit*/
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extern LGPOS lgposLastMSFlush;
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extern BYTE *pbEntry;
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extern BYTE *pbWrite;
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extern INT isecWrite; /* next disk to write. */
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extern BYTE *pbNext;
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extern BYTE *pbRead;
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extern INT isecRead; /* next disk to Read. */
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extern LGPOS lgposLastRec; /* setinal for last log record for redo */
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/*** log record position ***/
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extern LGPOS lgposLogRec; /* last log record entry, updated by ErrLGLogRec */
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extern LGPOS lgposToFlush; /* next point starting the flush. Right after */
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/* lgposLogRec. */
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extern LGPOS lgposRedo; /* redo log record entry */
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extern LGPOS lgposFullBackup;
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extern LOGTIME logtimeFullBackup;
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extern LGPOS lgposIncBackup;
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extern LOGTIME logtimeIncBackup;
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extern RSTMAP *rgrstmapGlobal;
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extern INT irstmapGlobalMac;
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extern LGPOS lgposStart; /* last log start position */
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// logging MUTEX
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extern CRIT critLGFlush;
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extern CRIT critLGBuf;
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extern CRIT critCheckpoint;
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extern CRIT critLGWaitQ;
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extern SIG sigLogFlush;
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// logging EVENT
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extern SIG sigLGFlush;
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//------ log.c --------------------------------------------------------------
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ERR ErrLGOpenJetLog( VOID );
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ERR ErrLGWrite( int isecOffset, BYTE *pbData, int csecData );
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ERR ErrLGRead( HANDLE hfLog, int ibOffset, BYTE *pbData, int csec );
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#define fCheckLogID fTrue
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#define fNoCheckLogID fFalse
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ERR ErrLGReadFileHdr( HANDLE hfLog, LGFILEHDR *plgfilehdr, BOOL fNeedToCheckLogID );
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VOID LGSzFromLogId( CHAR *rgbLogFileName, LONG lgen );
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#define fLGOldLogExists (1<<0)
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#define fLGOldLogNotExists (1<<1)
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#define fLGOldLogInBackup (1<<2)
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#define fLGReserveLogs (1<<3)
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ERR ErrLGNewLogFile( LONG lgen, BOOL fLGFlags );
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ULONG LGFlushLog( VOID );
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#ifdef PERFCNT
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ERR ErrLGFlushLog( int tidCaller );
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#else
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ERR ErrLGFlushLog( );
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#endif
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STATIC INLINE QWORD CbOffsetLgpos( LGPOS lgpos1, LGPOS lgpos2 )
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{
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// take difference of byte offsets, then
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// log sectors, and finally generations
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return (QWORD) ( lgpos1.ib - lgpos2.ib )
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+ cbSec * (QWORD) ( lgpos1.isec - lgpos2.isec )
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+ csecLGFile * cbSec * (QWORD) ( lgpos1.lGeneration - lgpos2.lGeneration );
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}
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//------ redo.c -------------------------------------------------------------
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/* corresponding pointer to process information block
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/**/
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typedef struct
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{
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PROCID procid;
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PIB *ppib;
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FUCB *rgpfucbOpen[dbidMax];
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} CPPIB;
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extern CPPIB *rgcppib; /* array of pibs-procids during Redo */
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/* Patch in-memory structure.
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*/
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#define cppatchlstHash 577
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#define IppatchlstHash( pn ) ( (pn) % cppatchlstHash )
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typedef struct _patch {
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DBID dbid;
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QWORD qwDBTime;
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INT ipage;
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struct _patch *ppatch;
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} PATCH;
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typedef struct _patchlst {
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PN pn;
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PATCH *ppatch;
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struct _patchlst *ppatchlst;
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} PATCHLST;
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PATCH *PpatchLGSearch( QWORD qwDBTimeRedo, PN pn );
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ERR ErrLGPatchPage( PIB *ppib, PN pn, PATCH *ppatch );
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ERR ErrLGPatchDatabase( DBID dbid, INT irstmap );
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//------ debug code --------------------------------------------------------
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#ifdef DEBUG
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#define FlagUsed( pb, cb ) memset( pb, 'x', cb )
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#else /* !DEBUG */
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#define FlagUsed( pb, cb )
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#endif /* !DEBUG */
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//------ function headers ---------------------------------------------------
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VOID LGFirstGeneration( CHAR *szSearchPath, LONG *plgen );
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ERR ErrLGRedoable( PIB *ppib, PN pn, QWORD qwDBTime, BF **ppbf, BOOL *pfRedoable );
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INT IrstmapLGGetRstMapEntry( CHAR *szName );
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ERR ErrLGGetDestDatabaseName( CHAR *szDatabaseName, INT *pirstmap, LGSTATUSINFO *plgstat );
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ERR ErrLGRedo( CHECKPOINT *pcheckpoint, LGSTATUSINFO *plgstat );
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ERR ErrLGRedoOperations( LGPOS *plgposRedoFrom, LGSTATUSINFO *plgstat );
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INT CbLGSizeOfRec( LR * );
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ERR ErrLGCheckReadLastLogRecord( BOOL *pfCloseNormally );
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ERR ErrLGLocateFirstRedoLogRec( LGPOS *plgposRedo, BYTE **ppbLR );
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ERR ErrLGGetNextRec( BYTE ** );
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VOID LGLastGeneration( CHAR *szSearchPath, LONG *plgen );
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VOID AddLogRec( BYTE *pb, INT cb, BYTE **ppbET);
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VOID GetLgpos( BYTE *pb, LGPOS *plgpos );
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#define GetLgposOfPbEntry( plgpos ) GetLgpos( pbEntry, plgpos )
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VOID GetLgposOfPbNext(LGPOS *plgpos);
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VOID LGFullNameCheckpoint( CHAR *szFullName );
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ERR ErrLGIReadCheckpoint( CHAR *szCheckpointFile, CHECKPOINT *pcheckpoint );
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ERR ErrLGIWriteCheckpoint( CHAR *szCheckpointFile, CHECKPOINT *pcheckpoint );
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VOID LGUpdateCheckpointFile( BOOL fUpdatedAttachment );
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VOID LGLoadAttachmentsFromFMP( BYTE *pbBuf, INT cb );
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ERR ErrLGLoadFMPFromAttachments( BYTE *pbAttach );
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#define fNoProperLogFile 1
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#define fRedoLogFile 2
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#define fNormalClose 3
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ERR ErrLGOpenRedoLogFile( LGPOS *plgposRedoFrom, int *pfStatus );
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ERR ErrLGWriteFileHdr(LGFILEHDR *plgfilehdr);
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ULONG UlLGHdrChecksum( LGFILEHDR *plgfilehdr );
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#ifdef DEBUG
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BOOL FLGDebugLogRec( LR *plr );
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VOID ShowData( BYTE *pbData, INT cbData );
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VOID PrintLgposReadLR(VOID);
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VOID ShowLR( LR *plr );
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#else
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#define ShowLR( plr ) 0
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#endif /* !DEBUG */
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