From 05dedace84ef8c93fea5309c3ac55f889011429b Mon Sep 17 00:00:00 2001
From: CVS to git conversion script <webmaster@postgresql.org>
Date: Thu, 20 Jun 2002 20:29:55 +0000
Subject: This commit was manufactured by cvs2git to create branch
 'ecpg_big_bison'.

Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.'
Delete:
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    HISTORY
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    src/test/regress/sql/create_view.sql
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---
 src/backend/access/transam/xlog.c | 3373 -------------------------------------
 1 file changed, 3373 deletions(-)
 delete mode 100644 src/backend/access/transam/xlog.c

(limited to 'src/backend/access/transam/xlog.c')

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
deleted file mode 100644
index 57e2dc6053a..00000000000
--- a/src/backend/access/transam/xlog.c
+++ /dev/null
@@ -1,3373 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * xlog.c
- *		PostgreSQL transaction log manager
- *
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.98 2002/06/20 20:29:25 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-
-#include <fcntl.h>
-#include <signal.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <dirent.h>
-#include <locale.h>
-
-#include "access/clog.h"
-#include "access/transam.h"
-#include "access/xact.h"
-#include "access/xlog.h"
-#include "access/xlogutils.h"
-#include "catalog/catversion.h"
-#include "catalog/pg_control.h"
-#include "storage/bufpage.h"
-#include "storage/lwlock.h"
-#include "storage/pmsignal.h"
-#include "storage/proc.h"
-#include "storage/sinval.h"
-#include "storage/spin.h"
-#include "utils/builtins.h"
-#include "utils/relcache.h"
-#include "miscadmin.h"
-
-
-/*
- * This chunk of hackery attempts to determine which file sync methods
- * are available on the current platform, and to choose an appropriate
- * default method.	We assume that fsync() is always available, and that
- * configure determined whether fdatasync() is.
- */
-#define SYNC_METHOD_FSYNC		0
-#define SYNC_METHOD_FDATASYNC	1
-#define SYNC_METHOD_OPEN		2		/* used for both O_SYNC and
-										 * O_DSYNC */
-
-#if defined(O_SYNC)
-#define OPEN_SYNC_FLAG	   O_SYNC
-#else
-#if defined(O_FSYNC)
-#define OPEN_SYNC_FLAG	  O_FSYNC
-#endif
-#endif
-
-#if defined(OPEN_SYNC_FLAG)
-#if defined(O_DSYNC) && (O_DSYNC != OPEN_SYNC_FLAG)
-#define OPEN_DATASYNC_FLAG	  O_DSYNC
-#endif
-#endif
-
-#if defined(OPEN_DATASYNC_FLAG)
-#define DEFAULT_SYNC_METHOD_STR    "open_datasync"
-#define DEFAULT_SYNC_METHOD		   SYNC_METHOD_OPEN
-#define DEFAULT_SYNC_FLAGBIT	   OPEN_DATASYNC_FLAG
-#else
-#if defined(HAVE_FDATASYNC)
-#define DEFAULT_SYNC_METHOD_STR   "fdatasync"
-#define DEFAULT_SYNC_METHOD		  SYNC_METHOD_FDATASYNC
-#define DEFAULT_SYNC_FLAGBIT	  0
-#else
-#define DEFAULT_SYNC_METHOD_STR   "fsync"
-#define DEFAULT_SYNC_METHOD		  SYNC_METHOD_FSYNC
-#define DEFAULT_SYNC_FLAGBIT	  0
-#endif
-#endif
-
-
-/* User-settable parameters */
-int			CheckPointSegments = 3;
-int			XLOGbuffers = 8;
-int			XLOGfiles = 0;		/* # of files to preallocate during ckpt */
-int			XLOG_DEBUG = 0;
-char	   *XLOG_sync_method = NULL;
-const char	XLOG_sync_method_default[] = DEFAULT_SYNC_METHOD_STR;
-char		XLOG_archive_dir[MAXPGPATH];		/* null string means
-												 * delete 'em */
-
-/*
- * XLOGfileslop is used in the code as the allowed "fuzz" in the number of
- * preallocated XLOG segments --- we try to have at least XLOGfiles advance
- * segments but no more than XLOGfiles+XLOGfileslop segments.  This could
- * be made a separate GUC variable, but at present I think it's sufficient
- * to hardwire it as 2*CheckPointSegments+1.  Under normal conditions, a
- * checkpoint will free no more than 2*CheckPointSegments log segments, and
- * we want to recycle all of them; the +1 allows boundary cases to happen
- * without wasting a delete/create-segment cycle.
- */
-
-#define XLOGfileslop	(2*CheckPointSegments + 1)
-
-
-/* these are derived from XLOG_sync_method by assign_xlog_sync_method */
-static int	sync_method = DEFAULT_SYNC_METHOD;
-static int	open_sync_bit = DEFAULT_SYNC_FLAGBIT;
-
-#define XLOG_SYNC_BIT  (enableFsync ? open_sync_bit : 0)
-
-#define MinXLOGbuffers	4
-
-
-/*
- * ThisStartUpID will be same in all backends --- it identifies current
- * instance of the database system.
- */
-StartUpID	ThisStartUpID = 0;
-
-/* Are we doing recovery by reading XLOG? */
-bool		InRecovery = false;
-
-/*
- * MyLastRecPtr points to the start of the last XLOG record inserted by the
- * current transaction.  If MyLastRecPtr.xrecoff == 0, then the current
- * xact hasn't yet inserted any transaction-controlled XLOG records.
- *
- * Note that XLOG records inserted outside transaction control are not
- * reflected into MyLastRecPtr.  They do, however, cause MyXactMadeXLogEntry
- * to be set true.  The latter can be used to test whether the current xact
- * made any loggable changes (including out-of-xact changes, such as
- * sequence updates).
- */
-XLogRecPtr	MyLastRecPtr = {0, 0};
-
-bool		MyXactMadeXLogEntry = false;
-
-/*
- * ProcLastRecPtr points to the start of the last XLOG record inserted by the
- * current backend.  It is updated for all inserts, transaction-controlled
- * or not.  ProcLastRecEnd is similar but points to end+1 of last record.
- */
-static XLogRecPtr ProcLastRecPtr = {0, 0};
-
-XLogRecPtr	ProcLastRecEnd = {0, 0};
-
-/*
- * RedoRecPtr is this backend's local copy of the REDO record pointer
- * (which is almost but not quite the same as a pointer to the most recent
- * CHECKPOINT record).	We update this from the shared-memory copy,
- * XLogCtl->Insert.RedoRecPtr, whenever we can safely do so (ie, when we
- * hold the Insert lock).  See XLogInsert for details.  We are also allowed
- * to update from XLogCtl->Insert.RedoRecPtr if we hold the info_lck;
- * see GetRedoRecPtr.
- */
-static XLogRecPtr RedoRecPtr;
-
-/*----------
- * Shared-memory data structures for XLOG control
- *
- * LogwrtRqst indicates a byte position that we need to write and/or fsync
- * the log up to (all records before that point must be written or fsynced).
- * LogwrtResult indicates the byte positions we have already written/fsynced.
- * These structs are identical but are declared separately to indicate their
- * slightly different functions.
- *
- * We do a lot of pushups to minimize the amount of access to lockable
- * shared memory values.  There are actually three shared-memory copies of
- * LogwrtResult, plus one unshared copy in each backend.  Here's how it works:
- *		XLogCtl->LogwrtResult is protected by info_lck
- *		XLogCtl->Write.LogwrtResult is protected by WALWriteLock
- *		XLogCtl->Insert.LogwrtResult is protected by WALInsertLock
- * One must hold the associated lock to read or write any of these, but
- * of course no lock is needed to read/write the unshared LogwrtResult.
- *
- * XLogCtl->LogwrtResult and XLogCtl->Write.LogwrtResult are both "always
- * right", since both are updated by a write or flush operation before
- * it releases WALWriteLock.  The point of keeping XLogCtl->Write.LogwrtResult
- * is that it can be examined/modified by code that already holds WALWriteLock
- * without needing to grab info_lck as well.
- *
- * XLogCtl->Insert.LogwrtResult may lag behind the reality of the other two,
- * but is updated when convenient.	Again, it exists for the convenience of
- * code that is already holding WALInsertLock but not the other locks.
- *
- * The unshared LogwrtResult may lag behind any or all of these, and again
- * is updated when convenient.
- *
- * The request bookkeeping is simpler: there is a shared XLogCtl->LogwrtRqst
- * (protected by info_lck), but we don't need to cache any copies of it.
- *
- * Note that this all works because the request and result positions can only
- * advance forward, never back up, and so we can easily determine which of two
- * values is "more up to date".
- *
- * info_lck is only held long enough to read/update the protected variables,
- * so it's a plain spinlock.  The other locks are held longer (potentially
- * over I/O operations), so we use LWLocks for them.  These locks are:
- *
- * WALInsertLock: must be held to insert a record into the WAL buffers.
- *
- * WALWriteLock: must be held to write WAL buffers to disk (XLogWrite or
- * XLogFlush).
- *
- * ControlFileLock: must be held to read/update control file or create
- * new log file.
- *
- * CheckpointLock: must be held to do a checkpoint (ensures only one
- * checkpointer at a time; even though the postmaster won't launch
- * parallel checkpoint processes, we need this because manual checkpoints
- * could be launched simultaneously).
- *
- *----------
- */
-typedef struct XLogwrtRqst
-{
-	XLogRecPtr	Write;			/* last byte + 1 to write out */
-	XLogRecPtr	Flush;			/* last byte + 1 to flush */
-} XLogwrtRqst;
-
-typedef struct XLogwrtResult
-{
-	XLogRecPtr	Write;			/* last byte + 1 written out */
-	XLogRecPtr	Flush;			/* last byte + 1 flushed */
-} XLogwrtResult;
-
-/*
- * Shared state data for XLogInsert.
- */
-typedef struct XLogCtlInsert
-{
-	XLogwrtResult LogwrtResult; /* a recent value of LogwrtResult */
-	XLogRecPtr	PrevRecord;		/* start of previously-inserted record */
-	uint16		curridx;		/* current block index in cache */
-	XLogPageHeader currpage;	/* points to header of block in cache */
-	char	   *currpos;		/* current insertion point in cache */
-	XLogRecPtr	RedoRecPtr;		/* current redo point for insertions */
-} XLogCtlInsert;
-
-/*
- * Shared state data for XLogWrite/XLogFlush.
- */
-typedef struct XLogCtlWrite
-{
-	XLogwrtResult LogwrtResult; /* current value of LogwrtResult */
-	uint16		curridx;		/* cache index of next block to write */
-} XLogCtlWrite;
-
-/*
- * Total shared-memory state for XLOG.
- */
-typedef struct XLogCtlData
-{
-	/* Protected by WALInsertLock: */
-	XLogCtlInsert Insert;
-	/* Protected by info_lck: */
-	XLogwrtRqst LogwrtRqst;
-	XLogwrtResult LogwrtResult;
-	/* Protected by WALWriteLock: */
-	XLogCtlWrite Write;
-
-	/*
-	 * These values do not change after startup, although the pointed-to
-	 * pages and xlblocks values certainly do.	Permission to read/write
-	 * the pages and xlblocks values depends on WALInsertLock and
-	 * WALWriteLock.
-	 */
-	char	   *pages;			/* buffers for unwritten XLOG pages */
-	XLogRecPtr *xlblocks;		/* 1st byte ptr-s + BLCKSZ */
-	uint32		XLogCacheByte;	/* # bytes in xlog buffers */
-	uint32		XLogCacheBlck;	/* highest allocated xlog buffer index */
-	StartUpID	ThisStartUpID;
-
-	/* This value is not protected by *any* lock... */
-	/* see SetSavedRedoRecPtr/GetSavedRedoRecPtr */
-	XLogRecPtr	SavedRedoRecPtr;
-
-	slock_t		info_lck;		/* locks shared LogwrtRqst/LogwrtResult */
-} XLogCtlData;
-
-static XLogCtlData *XLogCtl = NULL;
-
-/*
- * We maintain an image of pg_control in shared memory.
- */
-static ControlFileData *ControlFile = NULL;
-
-/*
- * Macros for managing XLogInsert state.  In most cases, the calling routine
- * has local copies of XLogCtl->Insert and/or XLogCtl->Insert->curridx,
- * so these are passed as parameters instead of being fetched via XLogCtl.
- */
-
-/* Free space remaining in the current xlog page buffer */
-#define INSERT_FREESPACE(Insert)  \
-	(BLCKSZ - ((Insert)->currpos - (char *) (Insert)->currpage))
-
-/* Construct XLogRecPtr value for current insertion point */
-#define INSERT_RECPTR(recptr,Insert,curridx)  \
-	( \
-	  (recptr).xlogid = XLogCtl->xlblocks[curridx].xlogid, \
-	  (recptr).xrecoff = \
-		XLogCtl->xlblocks[curridx].xrecoff - INSERT_FREESPACE(Insert) \
-	)
-
-
-/* Increment an xlogid/segment pair */
-#define NextLogSeg(logId, logSeg)	\
-	do { \
-		if ((logSeg) >= XLogSegsPerFile-1) \
-		{ \
-			(logId)++; \
-			(logSeg) = 0; \
-		} \
-		else \
-			(logSeg)++; \
-	} while (0)
-
-/* Decrement an xlogid/segment pair (assume it's not 0,0) */
-#define PrevLogSeg(logId, logSeg)	\
-	do { \
-		if (logSeg) \
-			(logSeg)--; \
-		else \
-		{ \
-			(logId)--; \
-			(logSeg) = XLogSegsPerFile-1; \
-		} \
-	} while (0)
-
-/*
- * Compute ID and segment from an XLogRecPtr.
- *
- * For XLByteToSeg, do the computation at face value.  For XLByteToPrevSeg,
- * a boundary byte is taken to be in the previous segment.	This is suitable
- * for deciding which segment to write given a pointer to a record end,
- * for example.
- */
-#define XLByteToSeg(xlrp, logId, logSeg)	\
-	( logId = (xlrp).xlogid, \
-	  logSeg = (xlrp).xrecoff / XLogSegSize \
-	)
-#define XLByteToPrevSeg(xlrp, logId, logSeg)	\
-	( logId = (xlrp).xlogid, \
-	  logSeg = ((xlrp).xrecoff - 1) / XLogSegSize \
-	)
-
-/*
- * Is an XLogRecPtr within a particular XLOG segment?
- *
- * For XLByteInSeg, do the computation at face value.  For XLByteInPrevSeg,
- * a boundary byte is taken to be in the previous segment.
- */
-#define XLByteInSeg(xlrp, logId, logSeg)	\
-	((xlrp).xlogid == (logId) && \
-	 (xlrp).xrecoff / XLogSegSize == (logSeg))
-
-#define XLByteInPrevSeg(xlrp, logId, logSeg)	\
-	((xlrp).xlogid == (logId) && \
-	 ((xlrp).xrecoff - 1) / XLogSegSize == (logSeg))
-
-
-#define XLogFileName(path, log, seg)	\
-			snprintf(path, MAXPGPATH, "%s/%08X%08X",	\
-					 XLogDir, log, seg)
-
-#define PrevBufIdx(idx)		\
-		(((idx) == 0) ? XLogCtl->XLogCacheBlck : ((idx) - 1))
-
-#define NextBufIdx(idx)		\
-		(((idx) == XLogCtl->XLogCacheBlck) ? 0 : ((idx) + 1))
-
-#define XRecOffIsValid(xrecoff) \
-		((xrecoff) % BLCKSZ >= SizeOfXLogPHD && \
-		(BLCKSZ - (xrecoff) % BLCKSZ) >= SizeOfXLogRecord)
-
-/*
- * _INTL_MAXLOGRECSZ: max space needed for a record including header and
- * any backup-block data.
- */
-#define _INTL_MAXLOGRECSZ	(SizeOfXLogRecord + MAXLOGRECSZ + \
-							 XLR_MAX_BKP_BLOCKS * (sizeof(BkpBlock) + BLCKSZ))
-
-
-/* File path names */
-static char XLogDir[MAXPGPATH];
-static char ControlFilePath[MAXPGPATH];
-
-/*
- * Private, possibly out-of-date copy of shared LogwrtResult.
- * See discussion above.
- */
-static XLogwrtResult LogwrtResult = {{0, 0}, {0, 0}};
-
-/*
- * openLogFile is -1 or a kernel FD for an open log file segment.
- * When it's open, openLogOff is the current seek offset in the file.
- * openLogId/openLogSeg identify the segment.  These variables are only
- * used to write the XLOG, and so will normally refer to the active segment.
- */
-static int	openLogFile = -1;
-static uint32 openLogId = 0;
-static uint32 openLogSeg = 0;
-static uint32 openLogOff = 0;
-
-/*
- * These variables are used similarly to the ones above, but for reading
- * the XLOG.  Note, however, that readOff generally represents the offset
- * of the page just read, not the seek position of the FD itself, which
- * will be just past that page.
- */
-static int	readFile = -1;
-static uint32 readId = 0;
-static uint32 readSeg = 0;
-static uint32 readOff = 0;
-
-/* Buffer for currently read page (BLCKSZ bytes) */
-static char *readBuf = NULL;
-
-/* State information for XLOG reading */
-static XLogRecPtr ReadRecPtr;
-static XLogRecPtr EndRecPtr;
-static XLogRecord *nextRecord = NULL;
-static StartUpID lastReadSUI;
-
-static bool InRedo = false;
-
-
-static bool AdvanceXLInsertBuffer(void);
-static void XLogWrite(XLogwrtRqst WriteRqst);
-static int XLogFileInit(uint32 log, uint32 seg,
-			 bool *use_existent, bool use_lock);
-static bool InstallXLogFileSegment(uint32 log, uint32 seg, char *tmppath,
-					   bool find_free, int max_advance,
-					   bool use_lock);
-static int	XLogFileOpen(uint32 log, uint32 seg, bool econt);
-static void PreallocXlogFiles(XLogRecPtr endptr);
-static void MoveOfflineLogs(uint32 log, uint32 seg, XLogRecPtr endptr);
-static XLogRecord *ReadRecord(XLogRecPtr *RecPtr, int emode, char *buffer);
-static bool ValidXLOGHeader(XLogPageHeader hdr, int emode, bool checkSUI);
-static XLogRecord *ReadCheckpointRecord(XLogRecPtr RecPtr,
-					 int whichChkpt,
-					 char *buffer);
-static void WriteControlFile(void);
-static void ReadControlFile(void);
-static char *str_time(time_t tnow);
-static void xlog_outrec(char *buf, XLogRecord *record);
-static void issue_xlog_fsync(void);
-
-
-/*
- * Insert an XLOG record having the specified RMID and info bytes,
- * with the body of the record being the data chunk(s) described by
- * the rdata list (see xlog.h for notes about rdata).
- *
- * Returns XLOG pointer to end of record (beginning of next record).
- * This can be used as LSN for data pages affected by the logged action.
- * (LSN is the XLOG point up to which the XLOG must be flushed to disk
- * before the data page can be written out.  This implements the basic
- * WAL rule "write the log before the data".)
- *
- * NB: this routine feels free to scribble on the XLogRecData structs,
- * though not on the data they reference.  This is OK since the XLogRecData
- * structs are always just temporaries in the calling code.
- */
-XLogRecPtr
-XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata)
-{
-	XLogCtlInsert *Insert = &XLogCtl->Insert;
-	XLogRecord *record;
-	XLogContRecord *contrecord;
-	XLogRecPtr	RecPtr;
-	XLogRecPtr	WriteRqst;
-	uint32		freespace;
-	uint16		curridx;
-	XLogRecData *rdt;
-	Buffer		dtbuf[XLR_MAX_BKP_BLOCKS];
-	bool		dtbuf_bkp[XLR_MAX_BKP_BLOCKS];
-	BkpBlock	dtbuf_xlg[XLR_MAX_BKP_BLOCKS];
-	XLogRecPtr	dtbuf_lsn[XLR_MAX_BKP_BLOCKS];
-	XLogRecData dtbuf_rdt[2 * XLR_MAX_BKP_BLOCKS];
-	crc64		rdata_crc;
-	uint32		len,
-				write_len;
-	unsigned	i;
-	XLogwrtRqst LogwrtRqst;
-	bool		updrqst;
-	bool		no_tran = (rmid == RM_XLOG_ID) ? true : false;
-
-	if (info & XLR_INFO_MASK)
-	{
-		if ((info & XLR_INFO_MASK) != XLOG_NO_TRAN)
-			elog(PANIC, "XLogInsert: invalid info mask %02X",
-				 (info & XLR_INFO_MASK));
-		no_tran = true;
-		info &= ~XLR_INFO_MASK;
-	}
-
-	/*
-	 * In bootstrap mode, we don't actually log anything but XLOG
-	 * resources; return a phony record pointer.
-	 */
-	if (IsBootstrapProcessingMode() && rmid != RM_XLOG_ID)
-	{
-		RecPtr.xlogid = 0;
-		RecPtr.xrecoff = SizeOfXLogPHD; /* start of 1st checkpoint record */
-		return (RecPtr);
-	}
-
-	/*
-	 * Here we scan the rdata list, determine which buffers must be backed
-	 * up, and compute the CRC values for the data.  Note that the record
-	 * header isn't added into the CRC yet since we don't know the final
-	 * length or info bits quite yet.
-	 *
-	 * We may have to loop back to here if a race condition is detected
-	 * below. We could prevent the race by doing all this work while
-	 * holding the insert lock, but it seems better to avoid doing CRC
-	 * calculations while holding the lock.  This means we have to be
-	 * careful about modifying the rdata list until we know we aren't
-	 * going to loop back again.  The only change we allow ourselves to
-	 * make earlier is to set rdt->data = NULL in list items we have
-	 * decided we will have to back up the whole buffer for.  This is OK
-	 * because we will certainly decide the same thing again for those
-	 * items if we do it over; doing it here saves an extra pass over the
-	 * list later.
-	 */
-begin:;
-	for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		dtbuf[i] = InvalidBuffer;
-		dtbuf_bkp[i] = false;
-	}
-
-	INIT_CRC64(rdata_crc);
-	len = 0;
-	for (rdt = rdata;;)
-	{
-		if (rdt->buffer == InvalidBuffer)
-		{
-			/* Simple data, just include it */
-			len += rdt->len;
-			COMP_CRC64(rdata_crc, rdt->data, rdt->len);
-		}
-		else
-		{
-			/* Find info for buffer */
-			for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-			{
-				if (rdt->buffer == dtbuf[i])
-				{
-					/* Buffer already referenced by earlier list item */
-					if (dtbuf_bkp[i])
-						rdt->data = NULL;
-					else if (rdt->data)
-					{
-						len += rdt->len;
-						COMP_CRC64(rdata_crc, rdt->data, rdt->len);
-					}
-					break;
-				}
-				if (dtbuf[i] == InvalidBuffer)
-				{
-					/* OK, put it in this slot */
-					dtbuf[i] = rdt->buffer;
-
-					/*
-					 * XXX We assume page LSN is first data on page
-					 */
-					dtbuf_lsn[i] = *((XLogRecPtr *) BufferGetBlock(rdt->buffer));
-					if (XLByteLE(dtbuf_lsn[i], RedoRecPtr))
-					{
-						crc64		dtcrc;
-
-						dtbuf_bkp[i] = true;
-						rdt->data = NULL;
-						INIT_CRC64(dtcrc);
-						COMP_CRC64(dtcrc,
-								   BufferGetBlock(dtbuf[i]),
-								   BLCKSZ);
-						dtbuf_xlg[i].node = BufferGetFileNode(dtbuf[i]);
-						dtbuf_xlg[i].block = BufferGetBlockNumber(dtbuf[i]);
-						COMP_CRC64(dtcrc,
-								(char *) &(dtbuf_xlg[i]) + sizeof(crc64),
-								   sizeof(BkpBlock) - sizeof(crc64));
-						FIN_CRC64(dtcrc);
-						dtbuf_xlg[i].crc = dtcrc;
-					}
-					else if (rdt->data)
-					{
-						len += rdt->len;
-						COMP_CRC64(rdata_crc, rdt->data, rdt->len);
-					}
-					break;
-				}
-			}
-			if (i >= XLR_MAX_BKP_BLOCKS)
-				elog(PANIC, "XLogInsert: can backup %d blocks at most",
-					 XLR_MAX_BKP_BLOCKS);
-		}
-		/* Break out of loop when rdt points to last list item */
-		if (rdt->next == NULL)
-			break;
-		rdt = rdt->next;
-	}
-
-	/*
-	 * NOTE: the test for len == 0 here is somewhat fishy, since in theory
-	 * all of the rmgr data might have been suppressed in favor of backup
-	 * blocks.	Currently, all callers of XLogInsert provide at least some
-	 * not-in-a-buffer data and so len == 0 should never happen, but that
-	 * may not be true forever.  If you need to remove the len == 0 check,
-	 * also remove the check for xl_len == 0 in ReadRecord, below.
-	 */
-	if (len == 0 || len > MAXLOGRECSZ)
-		elog(PANIC, "XLogInsert: invalid record length %u", len);
-
-	START_CRIT_SECTION();
-
-	/* update LogwrtResult before doing cache fill check */
-	{
-		/* use volatile pointer to prevent code rearrangement */
-		volatile XLogCtlData *xlogctl = XLogCtl;
-
-		SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-		LogwrtRqst = xlogctl->LogwrtRqst;
-		LogwrtResult = xlogctl->LogwrtResult;
-		SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-	}
-
-	/*
-	 * If cache is half filled then try to acquire write lock and do
-	 * XLogWrite. Ignore any fractional blocks in performing this check.
-	 */
-	LogwrtRqst.Write.xrecoff -= LogwrtRqst.Write.xrecoff % BLCKSZ;
-	if (LogwrtRqst.Write.xlogid != LogwrtResult.Write.xlogid ||
-		(LogwrtRqst.Write.xrecoff >= LogwrtResult.Write.xrecoff +
-		 XLogCtl->XLogCacheByte / 2))
-	{
-		if (LWLockConditionalAcquire(WALWriteLock, LW_EXCLUSIVE))
-		{
-			LogwrtResult = XLogCtl->Write.LogwrtResult;
-			if (XLByteLT(LogwrtResult.Write, LogwrtRqst.Write))
-				XLogWrite(LogwrtRqst);
-			LWLockRelease(WALWriteLock);
-		}
-	}
-
-	/* Now wait to get insert lock */
-	LWLockAcquire(WALInsertLock, LW_EXCLUSIVE);
-
-	/*
-	 * Check to see if my RedoRecPtr is out of date.  If so, may have to
-	 * go back and recompute everything.  This can only happen just after
-	 * a checkpoint, so it's better to be slow in this case and fast
-	 * otherwise.
-	 */
-	if (!XLByteEQ(RedoRecPtr, Insert->RedoRecPtr))
-	{
-		Assert(XLByteLT(RedoRecPtr, Insert->RedoRecPtr));
-		RedoRecPtr = Insert->RedoRecPtr;
-
-		for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-		{
-			if (dtbuf[i] == InvalidBuffer)
-				continue;
-			if (dtbuf_bkp[i] == false &&
-				XLByteLE(dtbuf_lsn[i], RedoRecPtr))
-			{
-				/*
-				 * Oops, this buffer now needs to be backed up, but we
-				 * didn't think so above.  Start over.
-				 */
-				LWLockRelease(WALInsertLock);
-				END_CRIT_SECTION();
-				goto begin;
-			}
-		}
-	}
-
-	/*
-	 * Make additional rdata list entries for the backup blocks, so that
-	 * we don't need to special-case them in the write loop.  Note that we
-	 * have now irrevocably changed the input rdata list.  At the exit of
-	 * this loop, write_len includes the backup block data.
-	 *
-	 * Also set the appropriate info bits to show which buffers were backed
-	 * up.	The i'th XLR_SET_BKP_BLOCK bit corresponds to the i'th
-	 * distinct buffer value (ignoring InvalidBuffer) appearing in the
-	 * rdata list.
-	 */
-	write_len = len;
-	for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		if (dtbuf[i] == InvalidBuffer || !(dtbuf_bkp[i]))
-			continue;
-
-		info |= XLR_SET_BKP_BLOCK(i);
-
-		rdt->next = &(dtbuf_rdt[2 * i]);
-
-		dtbuf_rdt[2 * i].data = (char *) &(dtbuf_xlg[i]);
-		dtbuf_rdt[2 * i].len = sizeof(BkpBlock);
-		write_len += sizeof(BkpBlock);
-
-		rdt = dtbuf_rdt[2 * i].next = &(dtbuf_rdt[2 * i + 1]);
-
-		dtbuf_rdt[2 * i + 1].data = (char *) BufferGetBlock(dtbuf[i]);
-		dtbuf_rdt[2 * i + 1].len = BLCKSZ;
-		write_len += BLCKSZ;
-		dtbuf_rdt[2 * i + 1].next = NULL;
-	}
-
-	/* Insert record header */
-
-	updrqst = false;
-	freespace = INSERT_FREESPACE(Insert);
-	if (freespace < SizeOfXLogRecord)
-	{
-		updrqst = AdvanceXLInsertBuffer();
-		freespace = BLCKSZ - SizeOfXLogPHD;
-	}
-
-	curridx = Insert->curridx;
-	record = (XLogRecord *) Insert->currpos;
-
-	record->xl_prev = Insert->PrevRecord;
-	if (no_tran)
-	{
-		record->xl_xact_prev.xlogid = 0;
-		record->xl_xact_prev.xrecoff = 0;
-	}
-	else
-		record->xl_xact_prev = MyLastRecPtr;
-
-	record->xl_xid = GetCurrentTransactionId();
-	record->xl_len = len;		/* doesn't include backup blocks */
-	record->xl_info = info;
-	record->xl_rmid = rmid;
-
-	/* Now we can finish computing the main CRC */
-	COMP_CRC64(rdata_crc, (char *) record + sizeof(crc64),
-			   SizeOfXLogRecord - sizeof(crc64));
-	FIN_CRC64(rdata_crc);
-	record->xl_crc = rdata_crc;
-
-	/* Compute record's XLOG location */
-	INSERT_RECPTR(RecPtr, Insert, curridx);
-
-	/* If first XLOG record of transaction, save it in PGPROC array */
-	if (MyLastRecPtr.xrecoff == 0 && !no_tran)
-	{
-		/*
-		 * We do not acquire SInvalLock here because of possible deadlock.
-		 * Anyone who wants to inspect other procs' logRec must acquire
-		 * WALInsertLock, instead.  A better solution would be a per-PROC
-		 * spinlock, but no time for that before 7.2 --- tgl 12/19/01.
-		 */
-		MyProc->logRec = RecPtr;
-	}
-
-	if (XLOG_DEBUG)
-	{
-		char		buf[8192];
-
-		sprintf(buf, "INSERT @ %X/%X: ", RecPtr.xlogid, RecPtr.xrecoff);
-		xlog_outrec(buf, record);
-		if (rdata->data != NULL)
-		{
-			strcat(buf, " - ");
-			RmgrTable[record->xl_rmid].rm_desc(buf, record->xl_info, rdata->data);
-		}
-		elog(LOG, "%s", buf);
-	}
-
-	/* Record begin of record in appropriate places */
-	if (!no_tran)
-		MyLastRecPtr = RecPtr;
-	ProcLastRecPtr = RecPtr;
-	Insert->PrevRecord = RecPtr;
-	MyXactMadeXLogEntry = true;
-
-	Insert->currpos += SizeOfXLogRecord;
-	freespace -= SizeOfXLogRecord;
-
-	/*
-	 * Append the data, including backup blocks if any
-	 */
-	while (write_len)
-	{
-		while (rdata->data == NULL)
-			rdata = rdata->next;
-
-		if (freespace > 0)
-		{
-			if (rdata->len > freespace)
-			{
-				memcpy(Insert->currpos, rdata->data, freespace);
-				rdata->data += freespace;
-				rdata->len -= freespace;
-				write_len -= freespace;
-			}
-			else
-			{
-				memcpy(Insert->currpos, rdata->data, rdata->len);
-				freespace -= rdata->len;
-				write_len -= rdata->len;
-				Insert->currpos += rdata->len;
-				rdata = rdata->next;
-				continue;
-			}
-		}
-
-		/* Use next buffer */
-		updrqst = AdvanceXLInsertBuffer();
-		curridx = Insert->curridx;
-		/* Insert cont-record header */
-		Insert->currpage->xlp_info |= XLP_FIRST_IS_CONTRECORD;
-		contrecord = (XLogContRecord *) Insert->currpos;
-		contrecord->xl_rem_len = write_len;
-		Insert->currpos += SizeOfXLogContRecord;
-		freespace = BLCKSZ - SizeOfXLogPHD - SizeOfXLogContRecord;
-	}
-
-	/* Ensure next record will be properly aligned */
-	Insert->currpos = (char *) Insert->currpage +
-		MAXALIGN(Insert->currpos - (char *) Insert->currpage);
-	freespace = INSERT_FREESPACE(Insert);
-
-	/*
-	 * The recptr I return is the beginning of the *next* record. This
-	 * will be stored as LSN for changed data pages...
-	 */
-	INSERT_RECPTR(RecPtr, Insert, curridx);
-
-	/* Need to update shared LogwrtRqst if some block was filled up */
-	if (freespace < SizeOfXLogRecord)
-		updrqst = true;			/* curridx is filled and available for
-								 * writing out */
-	else
-		curridx = PrevBufIdx(curridx);
-	WriteRqst = XLogCtl->xlblocks[curridx];
-
-	LWLockRelease(WALInsertLock);
-
-	if (updrqst)
-	{
-		/* use volatile pointer to prevent code rearrangement */
-		volatile XLogCtlData *xlogctl = XLogCtl;
-
-		SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-		/* advance global request to include new block(s) */
-		if (XLByteLT(xlogctl->LogwrtRqst.Write, WriteRqst))
-			xlogctl->LogwrtRqst.Write = WriteRqst;
-		/* update local result copy while I have the chance */
-		LogwrtResult = xlogctl->LogwrtResult;
-		SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-	}
-
-	ProcLastRecEnd = RecPtr;
-
-	END_CRIT_SECTION();
-
-	return (RecPtr);
-}
-
-/*
- * Advance the Insert state to the next buffer page, writing out the next
- * buffer if it still contains unwritten data.
- *
- * The global LogwrtRqst.Write pointer needs to be advanced to include the
- * just-filled page.  If we can do this for free (without an extra lock),
- * we do so here.  Otherwise the caller must do it.  We return TRUE if the
- * request update still needs to be done, FALSE if we did it internally.
- *
- * Must be called with WALInsertLock held.
- */
-static bool
-AdvanceXLInsertBuffer(void)
-{
-	XLogCtlInsert *Insert = &XLogCtl->Insert;
-	XLogCtlWrite *Write = &XLogCtl->Write;
-	uint16		nextidx = NextBufIdx(Insert->curridx);
-	bool		update_needed = true;
-	XLogRecPtr	OldPageRqstPtr;
-	XLogwrtRqst WriteRqst;
-	XLogRecPtr	NewPageEndPtr;
-	XLogPageHeader NewPage;
-
-	/* Use Insert->LogwrtResult copy if it's more fresh */
-	if (XLByteLT(LogwrtResult.Write, Insert->LogwrtResult.Write))
-		LogwrtResult = Insert->LogwrtResult;
-
-	/*
-	 * Get ending-offset of the buffer page we need to replace (this may
-	 * be zero if the buffer hasn't been used yet).  Fall through if it's
-	 * already written out.
-	 */
-	OldPageRqstPtr = XLogCtl->xlblocks[nextidx];
-	if (!XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
-	{
-		/* nope, got work to do... */
-		XLogRecPtr	FinishedPageRqstPtr;
-
-		FinishedPageRqstPtr = XLogCtl->xlblocks[Insert->curridx];
-
-		/* Before waiting, get info_lck and update LogwrtResult */
-		{
-			/* use volatile pointer to prevent code rearrangement */
-			volatile XLogCtlData *xlogctl = XLogCtl;
-
-			SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-			if (XLByteLT(xlogctl->LogwrtRqst.Write, FinishedPageRqstPtr))
-				xlogctl->LogwrtRqst.Write = FinishedPageRqstPtr;
-			LogwrtResult = xlogctl->LogwrtResult;
-			SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-		}
-
-		update_needed = false;	/* Did the shared-request update */
-
-		if (XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
-		{
-			/* OK, someone wrote it already */
-			Insert->LogwrtResult = LogwrtResult;
-		}
-		else
-		{
-			/* Must acquire write lock */
-			LWLockAcquire(WALWriteLock, LW_EXCLUSIVE);
-			LogwrtResult = Write->LogwrtResult;
-			if (XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
-			{
-				/* OK, someone wrote it already */
-				LWLockRelease(WALWriteLock);
-				Insert->LogwrtResult = LogwrtResult;
-			}
-			else
-			{
-				/*
-				 * Have to write buffers while holding insert lock. This
-				 * is not good, so only write as much as we absolutely
-				 * must.
-				 */
-				WriteRqst.Write = OldPageRqstPtr;
-				WriteRqst.Flush.xlogid = 0;
-				WriteRqst.Flush.xrecoff = 0;
-				XLogWrite(WriteRqst);
-				LWLockRelease(WALWriteLock);
-				Insert->LogwrtResult = LogwrtResult;
-			}
-		}
-	}
-
-	/*
-	 * Now the next buffer slot is free and we can set it up to be the
-	 * next output page.
-	 */
-	NewPageEndPtr = XLogCtl->xlblocks[Insert->curridx];
-	if (NewPageEndPtr.xrecoff >= XLogFileSize)
-	{
-		/* crossing a logid boundary */
-		NewPageEndPtr.xlogid += 1;
-		NewPageEndPtr.xrecoff = BLCKSZ;
-	}
-	else
-		NewPageEndPtr.xrecoff += BLCKSZ;
-	XLogCtl->xlblocks[nextidx] = NewPageEndPtr;
-	NewPage = (XLogPageHeader) (XLogCtl->pages + nextidx * BLCKSZ);
-	Insert->curridx = nextidx;
-	Insert->currpage = NewPage;
-	Insert->currpos = ((char *) NewPage) + SizeOfXLogPHD;
-
-	/*
-	 * Be sure to re-zero the buffer so that bytes beyond what we've
-	 * written will look like zeroes and not valid XLOG records...
-	 */
-	MemSet((char *) NewPage, 0, BLCKSZ);
-
-	/* And fill the new page's header */
-	NewPage->xlp_magic = XLOG_PAGE_MAGIC;
-	/* NewPage->xlp_info = 0; */	/* done by memset */
-	NewPage->xlp_sui = ThisStartUpID;
-	NewPage->xlp_pageaddr.xlogid = NewPageEndPtr.xlogid;
-	NewPage->xlp_pageaddr.xrecoff = NewPageEndPtr.xrecoff - BLCKSZ;
-
-	return update_needed;
-}
-
-/*
- * Write and/or fsync the log at least as far as WriteRqst indicates.
- *
- * Must be called with WALWriteLock held.
- */
-static void
-XLogWrite(XLogwrtRqst WriteRqst)
-{
-	XLogCtlWrite *Write = &XLogCtl->Write;
-	char	   *from;
-	bool		ispartialpage;
-	bool		use_existent;
-
-	/*
-	 * Update local LogwrtResult (caller probably did this already,
-	 * but...)
-	 */
-	LogwrtResult = Write->LogwrtResult;
-
-	while (XLByteLT(LogwrtResult.Write, WriteRqst.Write))
-	{
-		/*
-		 * Make sure we're not ahead of the insert process.  This could
-		 * happen if we're passed a bogus WriteRqst.Write that is past the
-		 * end of the last page that's been initialized by
-		 * AdvanceXLInsertBuffer.
-		 */
-		if (!XLByteLT(LogwrtResult.Write, XLogCtl->xlblocks[Write->curridx]))
-			elog(PANIC, "XLogWrite: write request %X/%X is past end of log %X/%X",
-				 LogwrtResult.Write.xlogid, LogwrtResult.Write.xrecoff,
-				 XLogCtl->xlblocks[Write->curridx].xlogid,
-				 XLogCtl->xlblocks[Write->curridx].xrecoff);
-
-		/* Advance LogwrtResult.Write to end of current buffer page */
-		LogwrtResult.Write = XLogCtl->xlblocks[Write->curridx];
-		ispartialpage = XLByteLT(WriteRqst.Write, LogwrtResult.Write);
-
-		if (!XLByteInPrevSeg(LogwrtResult.Write, openLogId, openLogSeg))
-		{
-			/*
-			 * Switch to new logfile segment.
-			 */
-			if (openLogFile >= 0)
-			{
-				if (close(openLogFile) != 0)
-					elog(PANIC, "close of log file %u, segment %u failed: %m",
-						 openLogId, openLogSeg);
-				openLogFile = -1;
-			}
-			XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
-
-			/* create/use new log file */
-			use_existent = true;
-			openLogFile = XLogFileInit(openLogId, openLogSeg,
-									   &use_existent, true);
-			openLogOff = 0;
-
-			if (!use_existent)	/* there was no precreated file */
-				elog(LOG, "XLogWrite: new log file created - "
-					 "consider increasing 'wal_files' in postgresql.conf.");
-
-			/* update pg_control, unless someone else already did */
-			LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
-			if (ControlFile->logId < openLogId ||
-				(ControlFile->logId == openLogId &&
-				 ControlFile->logSeg < openLogSeg + 1))
-			{
-				ControlFile->logId = openLogId;
-				ControlFile->logSeg = openLogSeg + 1;
-				ControlFile->time = time(NULL);
-				UpdateControlFile();
-
-				/*
-				 * Signal postmaster to start a checkpoint if it's been
-				 * too long since the last one.  (We look at local copy of
-				 * RedoRecPtr which might be a little out of date, but
-				 * should be close enough for this purpose.)
-				 */
-				if (IsUnderPostmaster &&
-					(openLogId != RedoRecPtr.xlogid ||
-					 openLogSeg >= (RedoRecPtr.xrecoff / XLogSegSize) +
-					 (uint32) CheckPointSegments))
-				{
-					if (XLOG_DEBUG)
-						elog(LOG, "XLogWrite: time for a checkpoint, signaling postmaster");
-					SendPostmasterSignal(PMSIGNAL_DO_CHECKPOINT);
-				}
-			}
-			LWLockRelease(ControlFileLock);
-		}
-
-		if (openLogFile < 0)
-		{
-			XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
-			openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
-			openLogOff = 0;
-		}
-
-		/* Need to seek in the file? */
-		if (openLogOff != (LogwrtResult.Write.xrecoff - BLCKSZ) % XLogSegSize)
-		{
-			openLogOff = (LogwrtResult.Write.xrecoff - BLCKSZ) % XLogSegSize;
-			if (lseek(openLogFile, (off_t) openLogOff, SEEK_SET) < 0)
-				elog(PANIC, "lseek of log file %u, segment %u, offset %u failed: %m",
-					 openLogId, openLogSeg, openLogOff);
-		}
-
-		/* OK to write the page */
-		from = XLogCtl->pages + Write->curridx * BLCKSZ;
-		errno = 0;
-		if (write(openLogFile, from, BLCKSZ) != BLCKSZ)
-		{
-			/* if write didn't set errno, assume problem is no disk space */
-			if (errno == 0)
-				errno = ENOSPC;
-			elog(PANIC, "write of log file %u, segment %u, offset %u failed: %m",
-				 openLogId, openLogSeg, openLogOff);
-		}
-		openLogOff += BLCKSZ;
-
-		/*
-		 * If we just wrote the whole last page of a logfile segment,
-		 * fsync the segment immediately.  This avoids having to go back
-		 * and re-open prior segments when an fsync request comes along
-		 * later. Doing it here ensures that one and only one backend will
-		 * perform this fsync.
-		 */
-		if (openLogOff >= XLogSegSize && !ispartialpage)
-		{
-			issue_xlog_fsync();
-			LogwrtResult.Flush = LogwrtResult.Write;	/* end of current page */
-		}
-
-		if (ispartialpage)
-		{
-			/* Only asked to write a partial page */
-			LogwrtResult.Write = WriteRqst.Write;
-			break;
-		}
-		Write->curridx = NextBufIdx(Write->curridx);
-	}
-
-	/*
-	 * If asked to flush, do so
-	 */
-	if (XLByteLT(LogwrtResult.Flush, WriteRqst.Flush) &&
-		XLByteLT(LogwrtResult.Flush, LogwrtResult.Write))
-	{
-		/*
-		 * Could get here without iterating above loop, in which case we
-		 * might have no open file or the wrong one.  However, we do not
-		 * need to fsync more than one file.
-		 */
-		if (sync_method != SYNC_METHOD_OPEN)
-		{
-			if (openLogFile >= 0 &&
-			 !XLByteInPrevSeg(LogwrtResult.Write, openLogId, openLogSeg))
-			{
-				if (close(openLogFile) != 0)
-					elog(PANIC, "close of log file %u, segment %u failed: %m",
-						 openLogId, openLogSeg);
-				openLogFile = -1;
-			}
-			if (openLogFile < 0)
-			{
-				XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
-				openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
-				openLogOff = 0;
-			}
-			issue_xlog_fsync();
-		}
-		LogwrtResult.Flush = LogwrtResult.Write;
-	}
-
-	/*
-	 * Update shared-memory status
-	 *
-	 * We make sure that the shared 'request' values do not fall behind the
-	 * 'result' values.  This is not absolutely essential, but it saves
-	 * some code in a couple of places.
-	 */
-	{
-		/* use volatile pointer to prevent code rearrangement */
-		volatile XLogCtlData *xlogctl = XLogCtl;
-
-		SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-		xlogctl->LogwrtResult = LogwrtResult;
-		if (XLByteLT(xlogctl->LogwrtRqst.Write, LogwrtResult.Write))
-			xlogctl->LogwrtRqst.Write = LogwrtResult.Write;
-		if (XLByteLT(xlogctl->LogwrtRqst.Flush, LogwrtResult.Flush))
-			xlogctl->LogwrtRqst.Flush = LogwrtResult.Flush;
-		SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-	}
-
-	Write->LogwrtResult = LogwrtResult;
-}
-
-/*
- * Ensure that all XLOG data through the given position is flushed to disk.
- *
- * NOTE: this differs from XLogWrite mainly in that the WALWriteLock is not
- * already held, and we try to avoid acquiring it if possible.
- */
-void
-XLogFlush(XLogRecPtr record)
-{
-	XLogRecPtr	WriteRqstPtr;
-	XLogwrtRqst WriteRqst;
-
-	if (XLOG_DEBUG)
-	{
-		elog(LOG, "XLogFlush%s%s: request %X/%X; write %X/%X; flush %X/%X\n",
-			 (IsBootstrapProcessingMode()) ? "(bootstrap)" : "",
-			 (InRedo) ? "(redo)" : "",
-			 record.xlogid, record.xrecoff,
-			 LogwrtResult.Write.xlogid, LogwrtResult.Write.xrecoff,
-			 LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
-		fflush(stderr);
-	}
-
-	/* Disabled during REDO */
-	if (InRedo)
-		return;
-
-	/* Quick exit if already known flushed */
-	if (XLByteLE(record, LogwrtResult.Flush))
-		return;
-
-	START_CRIT_SECTION();
-
-	/*
-	 * Since fsync is usually a horribly expensive operation, we try to
-	 * piggyback as much data as we can on each fsync: if we see any more
-	 * data entered into the xlog buffer, we'll write and fsync that too,
-	 * so that the final value of LogwrtResult.Flush is as large as
-	 * possible. This gives us some chance of avoiding another fsync
-	 * immediately after.
-	 */
-
-	/* initialize to given target; may increase below */
-	WriteRqstPtr = record;
-
-	/* read LogwrtResult and update local state */
-	{
-		/* use volatile pointer to prevent code rearrangement */
-		volatile XLogCtlData *xlogctl = XLogCtl;
-
-		SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-		if (XLByteLT(WriteRqstPtr, xlogctl->LogwrtRqst.Write))
-			WriteRqstPtr = xlogctl->LogwrtRqst.Write;
-		LogwrtResult = xlogctl->LogwrtResult;
-		SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-	}
-
-	/* done already? */
-	if (!XLByteLE(record, LogwrtResult.Flush))
-	{
-		/* if something was added to log cache then try to flush this too */
-		if (LWLockConditionalAcquire(WALInsertLock, LW_EXCLUSIVE))
-		{
-			XLogCtlInsert *Insert = &XLogCtl->Insert;
-			uint32		freespace = INSERT_FREESPACE(Insert);
-
-			if (freespace < SizeOfXLogRecord)	/* buffer is full */
-				WriteRqstPtr = XLogCtl->xlblocks[Insert->curridx];
-			else
-			{
-				WriteRqstPtr = XLogCtl->xlblocks[Insert->curridx];
-				WriteRqstPtr.xrecoff -= freespace;
-			}
-			LWLockRelease(WALInsertLock);
-		}
-		/* now wait for the write lock */
-		LWLockAcquire(WALWriteLock, LW_EXCLUSIVE);
-		LogwrtResult = XLogCtl->Write.LogwrtResult;
-		if (!XLByteLE(record, LogwrtResult.Flush))
-		{
-			WriteRqst.Write = WriteRqstPtr;
-			WriteRqst.Flush = record;
-			XLogWrite(WriteRqst);
-		}
-		LWLockRelease(WALWriteLock);
-	}
-
-	END_CRIT_SECTION();
-
-	/*
-	 * If we still haven't flushed to the request point then we have a
-	 * problem; most likely, the requested flush point is past end of XLOG.
-	 * This has been seen to occur when a disk page has a corrupted LSN.
-	 *
-	 * Formerly we treated this as a PANIC condition, but that hurts the
-	 * system's robustness rather than helping it: we do not want to take
-	 * down the whole system due to corruption on one data page.  In
-	 * particular, if the bad page is encountered again during recovery then
-	 * we would be unable to restart the database at all!  (This scenario
-	 * has actually happened in the field several times with 7.1 releases.
-	 * Note that we cannot get here while InRedo is true, but if the bad
-	 * page is brought in and marked dirty during recovery then
-	 * CreateCheckpoint will try to flush it at the end of recovery.)
-	 *
-	 * The current approach is to ERROR under normal conditions, but only
-	 * WARNING during recovery, so that the system can be brought up even if
-	 * there's a corrupt LSN.  Note that for calls from xact.c, the ERROR
-	 * will be promoted to PANIC since xact.c calls this routine inside a
-	 * critical section.  However, calls from bufmgr.c are not within
-	 * critical sections and so we will not force a restart for a bad LSN
-	 * on a data page.
-	 */
-	if (XLByteLT(LogwrtResult.Flush, record))
-		elog(InRecovery ? WARNING : ERROR,
-			 "XLogFlush: request %X/%X is not satisfied --- flushed only to %X/%X",
-			 record.xlogid, record.xrecoff,
-			 LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
-}
-
-/*
- * Create a new XLOG file segment, or open a pre-existing one.
- *
- * log, seg: identify segment to be created/opened.
- *
- * *use_existent: if TRUE, OK to use a pre-existing file (else, any
- * pre-existing file will be deleted).	On return, TRUE if a pre-existing
- * file was used.
- *
- * use_lock: if TRUE, acquire ControlFileLock while moving file into
- * place.  This should be TRUE except during bootstrap log creation.  The
- * caller must *not* hold the lock at call.
- *
- * Returns FD of opened file.
- */
-static int
-XLogFileInit(uint32 log, uint32 seg,
-			 bool *use_existent, bool use_lock)
-{
-	char		path[MAXPGPATH];
-	char		tmppath[MAXPGPATH];
-	char		zbuffer[BLCKSZ];
-	int			fd;
-	int			nbytes;
-
-	XLogFileName(path, log, seg);
-
-	/*
-	 * Try to use existent file (checkpoint maker may have created it
-	 * already)
-	 */
-	if (*use_existent)
-	{
-		fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
-						   S_IRUSR | S_IWUSR);
-		if (fd < 0)
-		{
-			if (errno != ENOENT)
-				elog(PANIC, "open of %s (log file %u, segment %u) failed: %m",
-					 path, log, seg);
-		}
-		else
-			return (fd);
-	}
-
-	/*
-	 * Initialize an empty (all zeroes) segment.  NOTE: it is possible
-	 * that another process is doing the same thing.  If so, we will end
-	 * up pre-creating an extra log segment.  That seems OK, and better
-	 * than holding the lock throughout this lengthy process.
-	 */
-	snprintf(tmppath, MAXPGPATH, "%s/xlogtemp.%d",
-			 XLogDir, (int) getpid());
-
-	unlink(tmppath);
-
-	/* do not use XLOG_SYNC_BIT here --- want to fsync only at end of fill */
-	fd = BasicOpenFile(tmppath, O_RDWR | O_CREAT | O_EXCL | PG_BINARY,
-					   S_IRUSR | S_IWUSR);
-	if (fd < 0)
-		elog(PANIC, "creation of file %s failed: %m", tmppath);
-
-	/*
-	 * Zero-fill the file.	We have to do this the hard way to ensure that
-	 * all the file space has really been allocated --- on platforms that
-	 * allow "holes" in files, just seeking to the end doesn't allocate
-	 * intermediate space.	This way, we know that we have all the space
-	 * and (after the fsync below) that all the indirect blocks are down
-	 * on disk.  Therefore, fdatasync(2) or O_DSYNC will be sufficient to
-	 * sync future writes to the log file.
-	 */
-	MemSet(zbuffer, 0, sizeof(zbuffer));
-	for (nbytes = 0; nbytes < XLogSegSize; nbytes += sizeof(zbuffer))
-	{
-		errno = 0;
-		if ((int) write(fd, zbuffer, sizeof(zbuffer)) != (int) sizeof(zbuffer))
-		{
-			int			save_errno = errno;
-
-			/*
-			 * If we fail to make the file, delete it to release disk
-			 * space
-			 */
-			unlink(tmppath);
-			/* if write didn't set errno, assume problem is no disk space */
-			errno = save_errno ? save_errno : ENOSPC;
-
-			elog(PANIC, "ZeroFill failed to write %s: %m", tmppath);
-		}
-	}
-
-	if (pg_fsync(fd) != 0)
-		elog(PANIC, "fsync of file %s failed: %m", tmppath);
-
-	close(fd);
-
-	/*
-	 * Now move the segment into place with its final name.
-	 *
-	 * If caller didn't want to use a pre-existing file, get rid of any
-	 * pre-existing file.  Otherwise, cope with possibility that someone
-	 * else has created the file while we were filling ours: if so, use
-	 * ours to pre-create a future log segment.
-	 */
-	if (!InstallXLogFileSegment(log, seg, tmppath,
-								*use_existent, XLOGfiles + XLOGfileslop,
-								use_lock))
-	{
-		/* No need for any more future segments... */
-		unlink(tmppath);
-	}
-
-	/* Set flag to tell caller there was no existent file */
-	*use_existent = false;
-
-	/* Now open original target segment (might not be file I just made) */
-	fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
-					   S_IRUSR | S_IWUSR);
-	if (fd < 0)
-		elog(PANIC, "open of %s (log file %u, segment %u) failed: %m",
-			 path, log, seg);
-
-	return (fd);
-}
-
-/*
- * Install a new XLOG segment file as a current or future log segment.
- *
- * This is used both to install a newly-created segment (which has a temp
- * filename while it's being created) and to recycle an old segment.
- *
- * log, seg: identify segment to install as (or first possible target).
- *
- * tmppath: initial name of file to install.  It will be renamed into place.
- *
- * find_free: if TRUE, install the new segment at the first empty log/seg
- * number at or after the passed numbers.  If FALSE, install the new segment
- * exactly where specified, deleting any existing segment file there.
- *
- * max_advance: maximum number of log/seg slots to advance past the starting
- * point.  Fail if no free slot is found in this range.  (Irrelevant if
- * find_free is FALSE.)
- *
- * use_lock: if TRUE, acquire ControlFileLock while moving file into
- * place.  This should be TRUE except during bootstrap log creation.  The
- * caller must *not* hold the lock at call.
- *
- * Returns TRUE if file installed, FALSE if not installed because of
- * exceeding max_advance limit.  (Any other kind of failure causes elog().)
- */
-static bool
-InstallXLogFileSegment(uint32 log, uint32 seg, char *tmppath,
-					   bool find_free, int max_advance,
-					   bool use_lock)
-{
-	char		path[MAXPGPATH];
-	int			fd;
-
-	XLogFileName(path, log, seg);
-
-	/*
-	 * We want to be sure that only one process does this at a time.
-	 */
-	if (use_lock)
-		LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
-
-	if (!find_free)
-	{
-		/* Force installation: get rid of any pre-existing segment file */
-		unlink(path);
-	}
-	else
-	{
-		/* Find a free slot to put it in */
-		while ((fd = BasicOpenFile(path, O_RDWR | PG_BINARY,
-								   S_IRUSR | S_IWUSR)) >= 0)
-		{
-			close(fd);
-			if (--max_advance < 0)
-			{
-				/* Failed to find a free slot within specified range */
-				if (use_lock)
-					LWLockRelease(ControlFileLock);
-				return false;
-			}
-			NextLogSeg(log, seg);
-			XLogFileName(path, log, seg);
-		}
-	}
-
-	/*
-	 * Prefer link() to rename() here just to be really sure that we don't
-	 * overwrite an existing logfile.  However, there shouldn't be one, so
-	 * rename() is an acceptable substitute except for the truly paranoid.
-	 */
-#if !defined(__BEOS__) && !defined(N_PLAT_NLM) && !defined(__CYGWIN__)
-	if (link(tmppath, path) < 0)
-		elog(PANIC, "link from %s to %s (initialization of log file %u, segment %u) failed: %m",
-			 tmppath, path, log, seg);
-	unlink(tmppath);
-#else
-	if (rename(tmppath, path) < 0)
-		elog(PANIC, "rename from %s to %s (initialization of log file %u, segment %u) failed: %m",
-			 tmppath, path, log, seg);
-#endif
-
-	if (use_lock)
-		LWLockRelease(ControlFileLock);
-
-	return true;
-}
-
-/*
- * Open a pre-existing logfile segment.
- */
-static int
-XLogFileOpen(uint32 log, uint32 seg, bool econt)
-{
-	char		path[MAXPGPATH];
-	int			fd;
-
-	XLogFileName(path, log, seg);
-
-	fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
-					   S_IRUSR | S_IWUSR);
-	if (fd < 0)
-	{
-		if (econt && errno == ENOENT)
-		{
-			elog(LOG, "open of %s (log file %u, segment %u) failed: %m",
-				 path, log, seg);
-			return (fd);
-		}
-		elog(PANIC, "open of %s (log file %u, segment %u) failed: %m",
-			 path, log, seg);
-	}
-
-	return (fd);
-}
-
-/*
- * Preallocate log files beyond the specified log endpoint, according to
- * the XLOGfile user parameter.
- */
-static void
-PreallocXlogFiles(XLogRecPtr endptr)
-{
-	uint32		_logId;
-	uint32		_logSeg;
-	int			lf;
-	bool		use_existent;
-	int			i;
-
-	XLByteToPrevSeg(endptr, _logId, _logSeg);
-	if (XLOGfiles > 0)
-	{
-		for (i = 1; i <= XLOGfiles; i++)
-		{
-			NextLogSeg(_logId, _logSeg);
-			use_existent = true;
-			lf = XLogFileInit(_logId, _logSeg, &use_existent, true);
-			close(lf);
-		}
-	}
-	else if ((endptr.xrecoff - 1) % XLogSegSize >=
-			 (uint32) (0.75 * XLogSegSize))
-	{
-		NextLogSeg(_logId, _logSeg);
-		use_existent = true;
-		lf = XLogFileInit(_logId, _logSeg, &use_existent, true);
-		close(lf);
-	}
-}
-
-/*
- * Remove or move offline all log files older or equal to passed log/seg#
- *
- * endptr is current (or recent) end of xlog; this is used to determine
- * whether we want to recycle rather than delete no-longer-wanted log files.
- */
-static void
-MoveOfflineLogs(uint32 log, uint32 seg, XLogRecPtr endptr)
-{
-	uint32		endlogId;
-	uint32		endlogSeg;
-	DIR		   *xldir;
-	struct dirent *xlde;
-	char		lastoff[32];
-	char		path[MAXPGPATH];
-
-	XLByteToPrevSeg(endptr, endlogId, endlogSeg);
-
-	xldir = opendir(XLogDir);
-	if (xldir == NULL)
-		elog(PANIC, "could not open transaction log directory (%s): %m",
-			 XLogDir);
-
-	sprintf(lastoff, "%08X%08X", log, seg);
-
-	errno = 0;
-	while ((xlde = readdir(xldir)) != NULL)
-	{
-		if (strlen(xlde->d_name) == 16 &&
-			strspn(xlde->d_name, "0123456789ABCDEF") == 16 &&
-			strcmp(xlde->d_name, lastoff) <= 0)
-		{
-			snprintf(path, MAXPGPATH, "%s/%s", XLogDir, xlde->d_name);
-			if (XLOG_archive_dir[0])
-			{
-				elog(LOG, "archiving transaction log file %s",
-					 xlde->d_name);
-				elog(WARNING, "archiving log files is not implemented!");
-			}
-			else
-			{
-				/*
-				 * Before deleting the file, see if it can be recycled as
-				 * a future log segment.  We allow recycling segments up
-				 * to XLOGfiles + XLOGfileslop segments beyond the current
-				 * XLOG location.
-				 */
-				if (InstallXLogFileSegment(endlogId, endlogSeg, path,
-										   true, XLOGfiles + XLOGfileslop,
-										   true))
-				{
-					elog(LOG, "recycled transaction log file %s",
-						 xlde->d_name);
-				}
-				else
-				{
-					/* No need for any more future segments... */
-					elog(LOG, "removing transaction log file %s",
-						 xlde->d_name);
-					unlink(path);
-				}
-			}
-		}
-		errno = 0;
-	}
-	if (errno)
-		elog(PANIC, "could not read transaction log directory (%s): %m",
-			 XLogDir);
-	closedir(xldir);
-}
-
-/*
- * Restore the backup blocks present in an XLOG record, if any.
- *
- * We assume all of the record has been read into memory at *record.
- */
-static void
-RestoreBkpBlocks(XLogRecord *record, XLogRecPtr lsn)
-{
-	Relation	reln;
-	Buffer		buffer;
-	Page		page;
-	BkpBlock	bkpb;
-	char	   *blk;
-	int			i;
-
-	blk = (char *) XLogRecGetData(record) + record->xl_len;
-	for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
-			continue;
-
-		memcpy((char *) &bkpb, blk, sizeof(BkpBlock));
-		blk += sizeof(BkpBlock);
-
-		reln = XLogOpenRelation(true, record->xl_rmid, bkpb.node);
-
-		if (reln)
-		{
-			buffer = XLogReadBuffer(true, reln, bkpb.block);
-			if (BufferIsValid(buffer))
-			{
-				page = (Page) BufferGetPage(buffer);
-				memcpy((char *) page, blk, BLCKSZ);
-				PageSetLSN(page, lsn);
-				PageSetSUI(page, ThisStartUpID);
-				UnlockAndWriteBuffer(buffer);
-			}
-		}
-
-		blk += BLCKSZ;
-	}
-}
-
-/*
- * CRC-check an XLOG record.  We do not believe the contents of an XLOG
- * record (other than to the minimal extent of computing the amount of
- * data to read in) until we've checked the CRCs.
- *
- * We assume all of the record has been read into memory at *record.
- */
-static bool
-RecordIsValid(XLogRecord *record, XLogRecPtr recptr, int emode)
-{
-	crc64		crc;
-	crc64		cbuf;
-	int			i;
-	uint32		len = record->xl_len;
-	char	   *blk;
-
-	/* Check CRC of rmgr data and record header */
-	INIT_CRC64(crc);
-	COMP_CRC64(crc, XLogRecGetData(record), len);
-	COMP_CRC64(crc, (char *) record + sizeof(crc64),
-			   SizeOfXLogRecord - sizeof(crc64));
-	FIN_CRC64(crc);
-
-	if (!EQ_CRC64(record->xl_crc, crc))
-	{
-		elog(emode, "ReadRecord: bad resource manager data checksum in record at %X/%X",
-			 recptr.xlogid, recptr.xrecoff);
-		return (false);
-	}
-
-	/* Check CRCs of backup blocks, if any */
-	blk = (char *) XLogRecGetData(record) + len;
-	for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
-			continue;
-
-		INIT_CRC64(crc);
-		COMP_CRC64(crc, blk + sizeof(BkpBlock), BLCKSZ);
-		COMP_CRC64(crc, blk + sizeof(crc64),
-				   sizeof(BkpBlock) - sizeof(crc64));
-		FIN_CRC64(crc);
-		memcpy((char *) &cbuf, blk, sizeof(crc64));		/* don't assume
-														 * alignment */
-
-		if (!EQ_CRC64(cbuf, crc))
-		{
-			elog(emode, "ReadRecord: bad checksum of backup block %d in record at %X/%X",
-				 i + 1, recptr.xlogid, recptr.xrecoff);
-			return (false);
-		}
-		blk += sizeof(BkpBlock) + BLCKSZ;
-	}
-
-	return (true);
-}
-
-/*
- * Attempt to read an XLOG record.
- *
- * If RecPtr is not NULL, try to read a record at that position.  Otherwise
- * try to read a record just after the last one previously read.
- *
- * If no valid record is available, returns NULL, or fails if emode is PANIC.
- * (emode must be either PANIC or LOG.)
- *
- * buffer is a workspace at least _INTL_MAXLOGRECSZ bytes long.  It is needed
- * to reassemble a record that crosses block boundaries.  Note that on
- * successful return, the returned record pointer always points at buffer.
- */
-static XLogRecord *
-ReadRecord(XLogRecPtr *RecPtr, int emode, char *buffer)
-{
-	XLogRecord *record;
-	XLogRecPtr	tmpRecPtr = EndRecPtr;
-	uint32		len,
-				total_len;
-	uint32		targetPageOff;
-	unsigned	i;
-	bool		nextmode = false;
-
-	if (readBuf == NULL)
-	{
-		/*
-		 * First time through, permanently allocate readBuf.  We do it
-		 * this way, rather than just making a static array, for two
-		 * reasons: (1) no need to waste the storage in most
-		 * instantiations of the backend; (2) a static char array isn't
-		 * guaranteed to have any particular alignment, whereas malloc()
-		 * will provide MAXALIGN'd storage.
-		 */
-		readBuf = (char *) malloc(BLCKSZ);
-		Assert(readBuf != NULL);
-	}
-
-	if (RecPtr == NULL)
-	{
-		RecPtr = &tmpRecPtr;
-		nextmode = true;
-		/* fast case if next record is on same page */
-		if (nextRecord != NULL)
-		{
-			record = nextRecord;
-			goto got_record;
-		}
-		/* align old recptr to next page */
-		if (tmpRecPtr.xrecoff % BLCKSZ != 0)
-			tmpRecPtr.xrecoff += (BLCKSZ - tmpRecPtr.xrecoff % BLCKSZ);
-		if (tmpRecPtr.xrecoff >= XLogFileSize)
-		{
-			(tmpRecPtr.xlogid)++;
-			tmpRecPtr.xrecoff = 0;
-		}
-		tmpRecPtr.xrecoff += SizeOfXLogPHD;
-	}
-	else if (!XRecOffIsValid(RecPtr->xrecoff))
-		elog(PANIC, "ReadRecord: invalid record offset at %X/%X",
-			 RecPtr->xlogid, RecPtr->xrecoff);
-
-	if (readFile >= 0 && !XLByteInSeg(*RecPtr, readId, readSeg))
-	{
-		close(readFile);
-		readFile = -1;
-	}
-	XLByteToSeg(*RecPtr, readId, readSeg);
-	if (readFile < 0)
-	{
-		readFile = XLogFileOpen(readId, readSeg, (emode == LOG));
-		if (readFile < 0)
-			goto next_record_is_invalid;
-		readOff = (uint32) (-1);	/* force read to occur below */
-	}
-
-	targetPageOff = ((RecPtr->xrecoff % XLogSegSize) / BLCKSZ) * BLCKSZ;
-	if (readOff != targetPageOff)
-	{
-		readOff = targetPageOff;
-		if (lseek(readFile, (off_t) readOff, SEEK_SET) < 0)
-		{
-			elog(emode, "ReadRecord: lseek of log file %u, segment %u, offset %u failed: %m",
-				 readId, readSeg, readOff);
-			goto next_record_is_invalid;
-		}
-		if (read(readFile, readBuf, BLCKSZ) != BLCKSZ)
-		{
-			elog(emode, "ReadRecord: read of log file %u, segment %u, offset %u failed: %m",
-				 readId, readSeg, readOff);
-			goto next_record_is_invalid;
-		}
-		if (!ValidXLOGHeader((XLogPageHeader) readBuf, emode, nextmode))
-			goto next_record_is_invalid;
-	}
-	if ((((XLogPageHeader) readBuf)->xlp_info & XLP_FIRST_IS_CONTRECORD) &&
-		RecPtr->xrecoff % BLCKSZ == SizeOfXLogPHD)
-	{
-		elog(emode, "ReadRecord: contrecord is requested by %X/%X",
-			 RecPtr->xlogid, RecPtr->xrecoff);
-		goto next_record_is_invalid;
-	}
-	record = (XLogRecord *) ((char *) readBuf + RecPtr->xrecoff % BLCKSZ);
-
-got_record:;
-
-	/*
-	 * Currently, xl_len == 0 must be bad data, but that might not be true
-	 * forever.  See note in XLogInsert.
-	 */
-	if (record->xl_len == 0)
-	{
-		elog(emode, "ReadRecord: record with zero length at %X/%X",
-			 RecPtr->xlogid, RecPtr->xrecoff);
-		goto next_record_is_invalid;
-	}
-
-	/*
-	 * Compute total length of record including any appended backup
-	 * blocks.
-	 */
-	total_len = SizeOfXLogRecord + record->xl_len;
-	for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
-			continue;
-		total_len += sizeof(BkpBlock) + BLCKSZ;
-	}
-
-	/*
-	 * Make sure it will fit in buffer (currently, it is mechanically
-	 * impossible for this test to fail, but it seems like a good idea
-	 * anyway).
-	 */
-	if (total_len > _INTL_MAXLOGRECSZ)
-	{
-		elog(emode, "ReadRecord: record length %u at %X/%X too long",
-			 total_len, RecPtr->xlogid, RecPtr->xrecoff);
-		goto next_record_is_invalid;
-	}
-	if (record->xl_rmid > RM_MAX_ID)
-	{
-		elog(emode, "ReadRecord: invalid resource manager id %u at %X/%X",
-			 record->xl_rmid, RecPtr->xlogid, RecPtr->xrecoff);
-		goto next_record_is_invalid;
-	}
-	nextRecord = NULL;
-	len = BLCKSZ - RecPtr->xrecoff % BLCKSZ;
-	if (total_len > len)
-	{
-		/* Need to reassemble record */
-		XLogContRecord *contrecord;
-		uint32		gotlen = len;
-
-		memcpy(buffer, record, len);
-		record = (XLogRecord *) buffer;
-		buffer += len;
-		for (;;)
-		{
-			readOff += BLCKSZ;
-			if (readOff >= XLogSegSize)
-			{
-				close(readFile);
-				readFile = -1;
-				NextLogSeg(readId, readSeg);
-				readFile = XLogFileOpen(readId, readSeg, (emode == LOG));
-				if (readFile < 0)
-					goto next_record_is_invalid;
-				readOff = 0;
-			}
-			if (read(readFile, readBuf, BLCKSZ) != BLCKSZ)
-			{
-				elog(emode, "ReadRecord: read of log file %u, segment %u, offset %u failed: %m",
-					 readId, readSeg, readOff);
-				goto next_record_is_invalid;
-			}
-			if (!ValidXLOGHeader((XLogPageHeader) readBuf, emode, true))
-				goto next_record_is_invalid;
-			if (!(((XLogPageHeader) readBuf)->xlp_info & XLP_FIRST_IS_CONTRECORD))
-			{
-				elog(emode, "ReadRecord: there is no ContRecord flag in log file %u, segment %u, offset %u",
-					 readId, readSeg, readOff);
-				goto next_record_is_invalid;
-			}
-			contrecord = (XLogContRecord *) ((char *) readBuf + SizeOfXLogPHD);
-			if (contrecord->xl_rem_len == 0 ||
-				total_len != (contrecord->xl_rem_len + gotlen))
-			{
-				elog(emode, "ReadRecord: invalid ContRecord length %u in log file %u, segment %u, offset %u",
-					 contrecord->xl_rem_len, readId, readSeg, readOff);
-				goto next_record_is_invalid;
-			}
-			len = BLCKSZ - SizeOfXLogPHD - SizeOfXLogContRecord;
-			if (contrecord->xl_rem_len > len)
-			{
-				memcpy(buffer, (char *) contrecord + SizeOfXLogContRecord, len);
-				gotlen += len;
-				buffer += len;
-				continue;
-			}
-			memcpy(buffer, (char *) contrecord + SizeOfXLogContRecord,
-				   contrecord->xl_rem_len);
-			break;
-		}
-		if (!RecordIsValid(record, *RecPtr, emode))
-			goto next_record_is_invalid;
-		if (BLCKSZ - SizeOfXLogRecord >= SizeOfXLogPHD +
-			SizeOfXLogContRecord + MAXALIGN(contrecord->xl_rem_len))
-		{
-			nextRecord = (XLogRecord *) ((char *) contrecord +
-				SizeOfXLogContRecord + MAXALIGN(contrecord->xl_rem_len));
-		}
-		EndRecPtr.xlogid = readId;
-		EndRecPtr.xrecoff = readSeg * XLogSegSize + readOff +
-			SizeOfXLogPHD + SizeOfXLogContRecord +
-			MAXALIGN(contrecord->xl_rem_len);
-		ReadRecPtr = *RecPtr;
-		return record;
-	}
-
-	/* Record does not cross a page boundary */
-	if (!RecordIsValid(record, *RecPtr, emode))
-		goto next_record_is_invalid;
-	if (BLCKSZ - SizeOfXLogRecord >= RecPtr->xrecoff % BLCKSZ +
-		MAXALIGN(total_len))
-		nextRecord = (XLogRecord *) ((char *) record + MAXALIGN(total_len));
-	EndRecPtr.xlogid = RecPtr->xlogid;
-	EndRecPtr.xrecoff = RecPtr->xrecoff + MAXALIGN(total_len);
-	ReadRecPtr = *RecPtr;
-	memcpy(buffer, record, total_len);
-	return (XLogRecord *) buffer;
-
-next_record_is_invalid:;
-	close(readFile);
-	readFile = -1;
-	nextRecord = NULL;
-	return NULL;
-}
-
-/*
- * Check whether the xlog header of a page just read in looks valid.
- *
- * This is just a convenience subroutine to avoid duplicated code in
- * ReadRecord.	It's not intended for use from anywhere else.
- */
-static bool
-ValidXLOGHeader(XLogPageHeader hdr, int emode, bool checkSUI)
-{
-	XLogRecPtr	recaddr;
-
-	if (hdr->xlp_magic != XLOG_PAGE_MAGIC)
-	{
-		elog(emode, "ReadRecord: invalid magic number %04X in log file %u, segment %u, offset %u",
-			 hdr->xlp_magic, readId, readSeg, readOff);
-		return false;
-	}
-	if ((hdr->xlp_info & ~XLP_ALL_FLAGS) != 0)
-	{
-		elog(emode, "ReadRecord: invalid info bits %04X in log file %u, segment %u, offset %u",
-			 hdr->xlp_info, readId, readSeg, readOff);
-		return false;
-	}
-	recaddr.xlogid = readId;
-	recaddr.xrecoff = readSeg * XLogSegSize + readOff;
-	if (!XLByteEQ(hdr->xlp_pageaddr, recaddr))
-	{
-		elog(emode, "ReadRecord: unexpected pageaddr %X/%X in log file %u, segment %u, offset %u",
-			 hdr->xlp_pageaddr.xlogid, hdr->xlp_pageaddr.xrecoff,
-			 readId, readSeg, readOff);
-		return false;
-	}
-
-	/*
-	 * We disbelieve a SUI less than the previous page's SUI, or more than
-	 * a few counts greater.  In theory as many as 512 shutdown checkpoint
-	 * records could appear on a 32K-sized xlog page, so that's the most
-	 * differential there could legitimately be.
-	 *
-	 * Note this check can only be applied when we are reading the next page
-	 * in sequence, so ReadRecord passes a flag indicating whether to
-	 * check.
-	 */
-	if (checkSUI)
-	{
-		if (hdr->xlp_sui < lastReadSUI ||
-			hdr->xlp_sui > lastReadSUI + 512)
-		{
-			/* translator: SUI = startup id */
-			elog(emode, "ReadRecord: out-of-sequence SUI %u (after %u) in log file %u, segment %u, offset %u",
-				 hdr->xlp_sui, lastReadSUI, readId, readSeg, readOff);
-			return false;
-		}
-	}
-	lastReadSUI = hdr->xlp_sui;
-	return true;
-}
-
-/*
- * I/O routines for pg_control
- *
- * *ControlFile is a buffer in shared memory that holds an image of the
- * contents of pg_control.	WriteControlFile() initializes pg_control
- * given a preloaded buffer, ReadControlFile() loads the buffer from
- * the pg_control file (during postmaster or standalone-backend startup),
- * and UpdateControlFile() rewrites pg_control after we modify xlog state.
- *
- * For simplicity, WriteControlFile() initializes the fields of pg_control
- * that are related to checking backend/database compatibility, and
- * ReadControlFile() verifies they are correct.  We could split out the
- * I/O and compatibility-check functions, but there seems no need currently.
- */
-
-void
-XLOGPathInit(void)
-{
-	/* Init XLOG file paths */
-	snprintf(XLogDir, MAXPGPATH, "%s/pg_xlog", DataDir);
-	snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
-}
-
-static void
-WriteControlFile(void)
-{
-	int			fd;
-	char		buffer[BLCKSZ]; /* need not be aligned */
-	char	   *localeptr;
-
-	/*
-	 * Initialize version and compatibility-check fields
-	 */
-	ControlFile->pg_control_version = PG_CONTROL_VERSION;
-	ControlFile->catalog_version_no = CATALOG_VERSION_NO;
-	ControlFile->blcksz = BLCKSZ;
-	ControlFile->relseg_size = RELSEG_SIZE;
-
-	ControlFile->nameDataLen = NAMEDATALEN;
-	ControlFile->funcMaxArgs = FUNC_MAX_ARGS;
-
-#ifdef HAVE_INT64_TIMESTAMP
-	ControlFile->enableIntTimes = TRUE;
-#else
-	ControlFile->enableIntTimes = FALSE;
-#endif
-
-	ControlFile->localeBuflen = LOCALE_NAME_BUFLEN;
-	localeptr = setlocale(LC_COLLATE, NULL);
-	if (!localeptr)
-		elog(PANIC, "invalid LC_COLLATE setting");
-	StrNCpy(ControlFile->lc_collate, localeptr, LOCALE_NAME_BUFLEN);
-	localeptr = setlocale(LC_CTYPE, NULL);
-	if (!localeptr)
-		elog(PANIC, "invalid LC_CTYPE setting");
-	StrNCpy(ControlFile->lc_ctype, localeptr, LOCALE_NAME_BUFLEN);
-
-	/* Contents are protected with a CRC */
-	INIT_CRC64(ControlFile->crc);
-	COMP_CRC64(ControlFile->crc,
-			   (char *) ControlFile + sizeof(crc64),
-			   sizeof(ControlFileData) - sizeof(crc64));
-	FIN_CRC64(ControlFile->crc);
-
-	/*
-	 * We write out BLCKSZ bytes into pg_control, zero-padding the excess
-	 * over sizeof(ControlFileData).  This reduces the odds of
-	 * premature-EOF errors when reading pg_control.  We'll still fail
-	 * when we check the contents of the file, but hopefully with a more
-	 * specific error than "couldn't read pg_control".
-	 */
-	if (sizeof(ControlFileData) > BLCKSZ)
-		elog(PANIC, "sizeof(ControlFileData) is larger than BLCKSZ; fix either one");
-
-	memset(buffer, 0, BLCKSZ);
-	memcpy(buffer, ControlFile, sizeof(ControlFileData));
-
-	fd = BasicOpenFile(ControlFilePath, O_RDWR | O_CREAT | O_EXCL | PG_BINARY,
-					   S_IRUSR | S_IWUSR);
-	if (fd < 0)
-		elog(PANIC, "WriteControlFile: could not create control file (%s): %m",
-			 ControlFilePath);
-
-	errno = 0;
-	if (write(fd, buffer, BLCKSZ) != BLCKSZ)
-	{
-		/* if write didn't set errno, assume problem is no disk space */
-		if (errno == 0)
-			errno = ENOSPC;
-		elog(PANIC, "WriteControlFile: write to control file failed: %m");
-	}
-
-	if (pg_fsync(fd) != 0)
-		elog(PANIC, "WriteControlFile: fsync of control file failed: %m");
-
-	close(fd);
-}
-
-static void
-ReadControlFile(void)
-{
-	crc64		crc;
-	int			fd;
-
-	/*
-	 * Read data...
-	 */
-	fd = BasicOpenFile(ControlFilePath, O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR);
-	if (fd < 0)
-		elog(PANIC, "could not open control file (%s): %m", ControlFilePath);
-
-	if (read(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
-		elog(PANIC, "read from control file failed: %m");
-
-	close(fd);
-
-	/*
-	 * Check for expected pg_control format version.  If this is wrong,
-	 * the CRC check will likely fail because we'll be checking the wrong
-	 * number of bytes.  Complaining about wrong version will probably be
-	 * more enlightening than complaining about wrong CRC.
-	 */
-	if (ControlFile->pg_control_version != PG_CONTROL_VERSION)
-		elog(PANIC,
-			 "The database cluster was initialized with PG_CONTROL_VERSION %d,\n"
-			 "\tbut the server was compiled with PG_CONTROL_VERSION %d.\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->pg_control_version, PG_CONTROL_VERSION);
-
-	/* Now check the CRC. */
-	INIT_CRC64(crc);
-	COMP_CRC64(crc,
-			   (char *) ControlFile + sizeof(crc64),
-			   sizeof(ControlFileData) - sizeof(crc64));
-	FIN_CRC64(crc);
-
-	if (!EQ_CRC64(crc, ControlFile->crc))
-		elog(PANIC, "invalid checksum in control file");
-
-	/*
-	 * Do compatibility checking immediately.  We do this here for 2
-	 * reasons:
-	 *
-	 * (1) if the database isn't compatible with the backend executable, we
-	 * want to abort before we can possibly do any damage;
-	 *
-	 * (2) this code is executed in the postmaster, so the setlocale() will
-	 * propagate to forked backends, which aren't going to read this file
-	 * for themselves.	(These locale settings are considered critical
-	 * compatibility items because they can affect sort order of indexes.)
-	 */
-	if (ControlFile->catalog_version_no != CATALOG_VERSION_NO)
-		elog(PANIC,
-			 "The database cluster was initialized with CATALOG_VERSION_NO %d,\n"
-			 "\tbut the backend was compiled with CATALOG_VERSION_NO %d.\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->catalog_version_no, CATALOG_VERSION_NO);
-	if (ControlFile->blcksz != BLCKSZ)
-		elog(PANIC,
-			 "The database cluster was initialized with BLCKSZ %d,\n"
-			 "\tbut the backend was compiled with BLCKSZ %d.\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->blcksz, BLCKSZ);
-	if (ControlFile->relseg_size != RELSEG_SIZE)
-		elog(PANIC,
-			 "The database cluster was initialized with RELSEG_SIZE %d,\n"
-			 "\tbut the backend was compiled with RELSEG_SIZE %d.\n"
-			 "\tIt looks like you need to recompile or initdb.",
-			 ControlFile->relseg_size, RELSEG_SIZE);
-
-	if (ControlFile->nameDataLen != NAMEDATALEN)
-		elog(PANIC,
-			 "The database cluster was initialized with NAMEDATALEN %d,\n"
-			 "\tbut the backend was compiled with NAMEDATALEN %d.\n"
-			 "\tIt looks like you need to recompile or initdb.",
-			 ControlFile->nameDataLen, NAMEDATALEN);
-
-	if (ControlFile->funcMaxArgs != FUNC_MAX_ARGS)
-		elog(PANIC,
-			 "The database cluster was initialized with FUNC_MAX_ARGS %d,\n"
-			 "\tbut the backend was compiled with FUNC_MAX_ARGS %d.\n"
-			 "\tIt looks like you need to recompile or initdb.",
-			 ControlFile->funcMaxArgs, FUNC_MAX_ARGS);
-
-#ifdef HAVE_INT64_TIMESTAMP
-	if (ControlFile->enableIntTimes != TRUE)
-		elog(PANIC,
-			 "The database cluster was initialized without HAVE_INT64_TIMESTAMP\n"
-			 "\tbut the backend was compiled with HAVE_INT64_TIMESTAMP.\n"
-			 "\tIt looks like you need to recompile or initdb.");
-#else
-	if (ControlFile->enableIntTimes != FALSE)
-		elog(PANIC,
-			 "The database cluster was initialized with HAVE_INT64_TIMESTAMP\n"
-			 "\tbut the backend was compiled without HAVE_INT64_TIMESTAMP.\n"
-			 "\tIt looks like you need to recompile or initdb.");
-#endif
-
-	if (ControlFile->localeBuflen != LOCALE_NAME_BUFLEN)
-		elog(PANIC,
-			 "The database cluster was initialized with LOCALE_NAME_BUFLEN %d,\n"
-			 "\tbut the backend was compiled with LOCALE_NAME_BUFLEN %d.\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->localeBuflen, LOCALE_NAME_BUFLEN);
-
-	if (setlocale(LC_COLLATE, ControlFile->lc_collate) == NULL)
-		elog(PANIC,
-			 "The database cluster was initialized with LC_COLLATE '%s',\n"
-			 "\twhich is not recognized by setlocale().\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->lc_collate);
-	if (setlocale(LC_CTYPE, ControlFile->lc_ctype) == NULL)
-		elog(PANIC,
-			 "The database cluster was initialized with LC_CTYPE '%s',\n"
-			 "\twhich is not recognized by setlocale().\n"
-			 "\tIt looks like you need to initdb.",
-			 ControlFile->lc_ctype);
-}
-
-void
-UpdateControlFile(void)
-{
-	int			fd;
-
-	INIT_CRC64(ControlFile->crc);
-	COMP_CRC64(ControlFile->crc,
-			   (char *) ControlFile + sizeof(crc64),
-			   sizeof(ControlFileData) - sizeof(crc64));
-	FIN_CRC64(ControlFile->crc);
-
-	fd = BasicOpenFile(ControlFilePath, O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR);
-	if (fd < 0)
-		elog(PANIC, "could not open control file (%s): %m", ControlFilePath);
-
-	errno = 0;
-	if (write(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
-	{
-		/* if write didn't set errno, assume problem is no disk space */
-		if (errno == 0)
-			errno = ENOSPC;
-		elog(PANIC, "write to control file failed: %m");
-	}
-
-	if (pg_fsync(fd) != 0)
-		elog(PANIC, "fsync of control file failed: %m");
-
-	close(fd);
-}
-
-/*
- * Initialization of shared memory for XLOG
- */
-
-int
-XLOGShmemSize(void)
-{
-	if (XLOGbuffers < MinXLOGbuffers)
-		XLOGbuffers = MinXLOGbuffers;
-
-	return MAXALIGN(sizeof(XLogCtlData) + sizeof(XLogRecPtr) * XLOGbuffers)
-		+ BLCKSZ * XLOGbuffers +
-		MAXALIGN(sizeof(ControlFileData));
-}
-
-void
-XLOGShmemInit(void)
-{
-	bool		found;
-
-	/* this must agree with space requested by XLOGShmemSize() */
-	if (XLOGbuffers < MinXLOGbuffers)
-		XLOGbuffers = MinXLOGbuffers;
-
-	XLogCtl = (XLogCtlData *)
-		ShmemInitStruct("XLOG Ctl",
-						MAXALIGN(sizeof(XLogCtlData) +
-								 sizeof(XLogRecPtr) * XLOGbuffers)
-						+ BLCKSZ * XLOGbuffers,
-						&found);
-	Assert(!found);
-	ControlFile = (ControlFileData *)
-		ShmemInitStruct("Control File", sizeof(ControlFileData), &found);
-	Assert(!found);
-
-	memset(XLogCtl, 0, sizeof(XLogCtlData));
-
-	/*
-	 * Since XLogCtlData contains XLogRecPtr fields, its sizeof should be
-	 * a multiple of the alignment for same, so no extra alignment padding
-	 * is needed here.
-	 */
-	XLogCtl->xlblocks = (XLogRecPtr *)
-		(((char *) XLogCtl) + sizeof(XLogCtlData));
-	memset(XLogCtl->xlblocks, 0, sizeof(XLogRecPtr) * XLOGbuffers);
-
-	/*
-	 * Here, on the other hand, we must MAXALIGN to ensure the page
-	 * buffers have worst-case alignment.
-	 */
-	XLogCtl->pages =
-		((char *) XLogCtl) + MAXALIGN(sizeof(XLogCtlData) +
-									  sizeof(XLogRecPtr) * XLOGbuffers);
-	memset(XLogCtl->pages, 0, BLCKSZ * XLOGbuffers);
-
-	/*
-	 * Do basic initialization of XLogCtl shared data. (StartupXLOG will
-	 * fill in additional info.)
-	 */
-	XLogCtl->XLogCacheByte = BLCKSZ * XLOGbuffers;
-	XLogCtl->XLogCacheBlck = XLOGbuffers - 1;
-	XLogCtl->Insert.currpage = (XLogPageHeader) (XLogCtl->pages);
-	SpinLockInit(&XLogCtl->info_lck);
-
-	/*
-	 * If we are not in bootstrap mode, pg_control should already exist.
-	 * Read and validate it immediately (see comments in ReadControlFile()
-	 * for the reasons why).
-	 */
-	if (!IsBootstrapProcessingMode())
-		ReadControlFile();
-}
-
-/*
- * This func must be called ONCE on system install.  It creates pg_control
- * and the initial XLOG segment.
- */
-void
-BootStrapXLOG(void)
-{
-	CheckPoint	checkPoint;
-	char	   *buffer;
-	XLogPageHeader page;
-	XLogRecord *record;
-	bool		use_existent;
-	crc64		crc;
-
-	/* Use malloc() to ensure buffer is MAXALIGNED */
-	buffer = (char *) malloc(BLCKSZ);
-	page = (XLogPageHeader) buffer;
-
-	checkPoint.redo.xlogid = 0;
-	checkPoint.redo.xrecoff = SizeOfXLogPHD;
-	checkPoint.undo = checkPoint.redo;
-	checkPoint.ThisStartUpID = 0;
-	checkPoint.nextXid = FirstNormalTransactionId;
-	checkPoint.nextOid = BootstrapObjectIdData;
-	checkPoint.time = time(NULL);
-
-	ShmemVariableCache->nextXid = checkPoint.nextXid;
-	ShmemVariableCache->nextOid = checkPoint.nextOid;
-	ShmemVariableCache->oidCount = 0;
-
-	memset(buffer, 0, BLCKSZ);
-	page->xlp_magic = XLOG_PAGE_MAGIC;
-	page->xlp_info = 0;
-	page->xlp_sui = checkPoint.ThisStartUpID;
-	page->xlp_pageaddr.xlogid = 0;
-	page->xlp_pageaddr.xrecoff = 0;
-	record = (XLogRecord *) ((char *) page + SizeOfXLogPHD);
-	record->xl_prev.xlogid = 0;
-	record->xl_prev.xrecoff = 0;
-	record->xl_xact_prev = record->xl_prev;
-	record->xl_xid = InvalidTransactionId;
-	record->xl_len = sizeof(checkPoint);
-	record->xl_info = XLOG_CHECKPOINT_SHUTDOWN;
-	record->xl_rmid = RM_XLOG_ID;
-	memcpy(XLogRecGetData(record), &checkPoint, sizeof(checkPoint));
-
-	INIT_CRC64(crc);
-	COMP_CRC64(crc, &checkPoint, sizeof(checkPoint));
-	COMP_CRC64(crc, (char *) record + sizeof(crc64),
-			   SizeOfXLogRecord - sizeof(crc64));
-	FIN_CRC64(crc);
-	record->xl_crc = crc;
-
-	use_existent = false;
-	openLogFile = XLogFileInit(0, 0, &use_existent, false);
-
-	errno = 0;
-	if (write(openLogFile, buffer, BLCKSZ) != BLCKSZ)
-	{
-		/* if write didn't set errno, assume problem is no disk space */
-		if (errno == 0)
-			errno = ENOSPC;
-		elog(PANIC, "BootStrapXLOG failed to write log file: %m");
-	}
-
-	if (pg_fsync(openLogFile) != 0)
-		elog(PANIC, "BootStrapXLOG failed to fsync log file: %m");
-
-	close(openLogFile);
-	openLogFile = -1;
-
-	memset(ControlFile, 0, sizeof(ControlFileData));
-	/* Initialize pg_control status fields */
-	ControlFile->state = DB_SHUTDOWNED;
-	ControlFile->time = checkPoint.time;
-	ControlFile->logId = 0;
-	ControlFile->logSeg = 1;
-	ControlFile->checkPoint = checkPoint.redo;
-	ControlFile->checkPointCopy = checkPoint;
-	/* some additional ControlFile fields are set in WriteControlFile() */
-
-	WriteControlFile();
-
-	/* Bootstrap the commit log, too */
-	BootStrapCLOG();
-}
-
-static char *
-str_time(time_t tnow)
-{
-	static char buf[32];
-
-	strftime(buf, sizeof(buf),
-			 "%Y-%m-%d %H:%M:%S %Z",
-			 localtime(&tnow));
-
-	return buf;
-}
-
-/*
- * This must be called ONCE during postmaster or standalone-backend startup
- */
-void
-StartupXLOG(void)
-{
-	XLogCtlInsert *Insert;
-	CheckPoint	checkPoint;
-	bool		wasShutdown;
-	XLogRecPtr	RecPtr,
-				LastRec,
-				checkPointLoc,
-				EndOfLog;
-	XLogRecord *record;
-	char	   *buffer;
-
-	/* Use malloc() to ensure record buffer is MAXALIGNED */
-	buffer = (char *) malloc(_INTL_MAXLOGRECSZ);
-
-	CritSectionCount++;
-
-	/*
-	 * Read control file and check XLOG status looks valid.
-	 *
-	 * Note: in most control paths, *ControlFile is already valid and we need
-	 * not do ReadControlFile() here, but might as well do it to be sure.
-	 */
-	ReadControlFile();
-
-	if (ControlFile->logSeg == 0 ||
-		ControlFile->state < DB_SHUTDOWNED ||
-		ControlFile->state > DB_IN_PRODUCTION ||
-		!XRecOffIsValid(ControlFile->checkPoint.xrecoff))
-		elog(PANIC, "control file context is broken");
-
-	if (ControlFile->state == DB_SHUTDOWNED)
-		elog(LOG, "database system was shut down at %s",
-			 str_time(ControlFile->time));
-	else if (ControlFile->state == DB_SHUTDOWNING)
-		elog(LOG, "database system shutdown was interrupted at %s",
-			 str_time(ControlFile->time));
-	else if (ControlFile->state == DB_IN_RECOVERY)
-		elog(LOG, "database system was interrupted being in recovery at %s\n"
-			 "\tThis probably means that some data blocks are corrupted\n"
-			 "\tand you will have to use the last backup for recovery.",
-			 str_time(ControlFile->time));
-	else if (ControlFile->state == DB_IN_PRODUCTION)
-		elog(LOG, "database system was interrupted at %s",
-			 str_time(ControlFile->time));
-
-	/*
-	 * Get the last valid checkpoint record.  If the latest one according
-	 * to pg_control is broken, try the next-to-last one.
-	 */
-	record = ReadCheckpointRecord(ControlFile->checkPoint, 1, buffer);
-	if (record != NULL)
-	{
-		checkPointLoc = ControlFile->checkPoint;
-		elog(LOG, "checkpoint record is at %X/%X",
-			 checkPointLoc.xlogid, checkPointLoc.xrecoff);
-	}
-	else
-	{
-		record = ReadCheckpointRecord(ControlFile->prevCheckPoint, 2, buffer);
-		if (record != NULL)
-		{
-			checkPointLoc = ControlFile->prevCheckPoint;
-			elog(LOG, "using previous checkpoint record at %X/%X",
-				 checkPointLoc.xlogid, checkPointLoc.xrecoff);
-			InRecovery = true;	/* force recovery even if SHUTDOWNED */
-		}
-		else
-			elog(PANIC, "unable to locate a valid checkpoint record");
-	}
-	LastRec = RecPtr = checkPointLoc;
-	memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
-	wasShutdown = (record->xl_info == XLOG_CHECKPOINT_SHUTDOWN);
-
-	elog(LOG, "redo record is at %X/%X; undo record is at %X/%X; shutdown %s",
-		 checkPoint.redo.xlogid, checkPoint.redo.xrecoff,
-		 checkPoint.undo.xlogid, checkPoint.undo.xrecoff,
-		 wasShutdown ? "TRUE" : "FALSE");
-	elog(LOG, "next transaction id: %u; next oid: %u",
-		 checkPoint.nextXid, checkPoint.nextOid);
-	if (!TransactionIdIsNormal(checkPoint.nextXid))
-		elog(PANIC, "invalid next transaction id");
-
-	ShmemVariableCache->nextXid = checkPoint.nextXid;
-	ShmemVariableCache->nextOid = checkPoint.nextOid;
-	ShmemVariableCache->oidCount = 0;
-
-	ThisStartUpID = checkPoint.ThisStartUpID;
-	RedoRecPtr = XLogCtl->Insert.RedoRecPtr =
-		XLogCtl->SavedRedoRecPtr = checkPoint.redo;
-
-	if (XLByteLT(RecPtr, checkPoint.redo))
-		elog(PANIC, "invalid redo in checkpoint record");
-	if (checkPoint.undo.xrecoff == 0)
-		checkPoint.undo = RecPtr;
-
-	if (XLByteLT(checkPoint.undo, RecPtr) ||
-		XLByteLT(checkPoint.redo, RecPtr))
-	{
-		if (wasShutdown)
-			elog(PANIC, "invalid redo/undo record in shutdown checkpoint");
-		InRecovery = true;
-	}
-	else if (ControlFile->state != DB_SHUTDOWNED)
-		InRecovery = true;
-
-	/* REDO */
-	if (InRecovery)
-	{
-		elog(LOG, "database system was not properly shut down; "
-			 "automatic recovery in progress");
-		ControlFile->state = DB_IN_RECOVERY;
-		ControlFile->time = time(NULL);
-		UpdateControlFile();
-
-		XLogInitRelationCache();
-
-		/* Is REDO required ? */
-		if (XLByteLT(checkPoint.redo, RecPtr))
-			record = ReadRecord(&(checkPoint.redo), PANIC, buffer);
-		else
-		{
-			/* read past CheckPoint record */
-			record = ReadRecord(NULL, LOG, buffer);
-		}
-
-		if (record != NULL)
-		{
-			InRedo = true;
-			elog(LOG, "redo starts at %X/%X",
-				 ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
-			do
-			{
-				/* nextXid must be beyond record's xid */
-				if (TransactionIdFollowsOrEquals(record->xl_xid,
-											ShmemVariableCache->nextXid))
-				{
-					ShmemVariableCache->nextXid = record->xl_xid;
-					TransactionIdAdvance(ShmemVariableCache->nextXid);
-				}
-				if (XLOG_DEBUG)
-				{
-					char		buf[8192];
-
-					sprintf(buf, "REDO @ %X/%X; LSN %X/%X: ",
-							ReadRecPtr.xlogid, ReadRecPtr.xrecoff,
-							EndRecPtr.xlogid, EndRecPtr.xrecoff);
-					xlog_outrec(buf, record);
-					strcat(buf, " - ");
-					RmgrTable[record->xl_rmid].rm_desc(buf,
-								record->xl_info, XLogRecGetData(record));
-					elog(LOG, "%s", buf);
-				}
-
-				if (record->xl_info & XLR_BKP_BLOCK_MASK)
-					RestoreBkpBlocks(record, EndRecPtr);
-
-				RmgrTable[record->xl_rmid].rm_redo(EndRecPtr, record);
-				record = ReadRecord(NULL, LOG, buffer);
-			} while (record != NULL);
-			elog(LOG, "redo done at %X/%X",
-				 ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
-			LastRec = ReadRecPtr;
-			InRedo = false;
-		}
-		else
-			elog(LOG, "redo is not required");
-	}
-
-	/*
-	 * Init xlog buffer cache using the block containing the last valid
-	 * record from the previous incarnation.
-	 */
-	record = ReadRecord(&LastRec, PANIC, buffer);
-	EndOfLog = EndRecPtr;
-	XLByteToPrevSeg(EndOfLog, openLogId, openLogSeg);
-	openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
-	openLogOff = 0;
-	ControlFile->logId = openLogId;
-	ControlFile->logSeg = openLogSeg + 1;
-	Insert = &XLogCtl->Insert;
-	Insert->PrevRecord = LastRec;
-
-	/*
-	 * If the next record will go to the new page then initialize for that
-	 * one.
-	 */
-	if ((BLCKSZ - EndOfLog.xrecoff % BLCKSZ) < SizeOfXLogRecord)
-		EndOfLog.xrecoff += (BLCKSZ - EndOfLog.xrecoff % BLCKSZ);
-	if (EndOfLog.xrecoff % BLCKSZ == 0)
-	{
-		XLogRecPtr	NewPageEndPtr;
-
-		NewPageEndPtr = EndOfLog;
-		if (NewPageEndPtr.xrecoff >= XLogFileSize)
-		{
-			/* crossing a logid boundary */
-			NewPageEndPtr.xlogid += 1;
-			NewPageEndPtr.xrecoff = BLCKSZ;
-		}
-		else
-			NewPageEndPtr.xrecoff += BLCKSZ;
-		XLogCtl->xlblocks[0] = NewPageEndPtr;
-		Insert->currpage->xlp_magic = XLOG_PAGE_MAGIC;
-		if (InRecovery)
-			Insert->currpage->xlp_sui = ThisStartUpID;
-		else
-			Insert->currpage->xlp_sui = ThisStartUpID + 1;
-		Insert->currpage->xlp_pageaddr.xlogid = NewPageEndPtr.xlogid;
-		Insert->currpage->xlp_pageaddr.xrecoff = NewPageEndPtr.xrecoff - BLCKSZ;
-		/* rest of buffer was zeroed in XLOGShmemInit */
-		Insert->currpos = (char *) Insert->currpage + SizeOfXLogPHD;
-	}
-	else
-	{
-		XLogCtl->xlblocks[0].xlogid = openLogId;
-		XLogCtl->xlblocks[0].xrecoff =
-			((EndOfLog.xrecoff - 1) / BLCKSZ + 1) * BLCKSZ;
-
-		/*
-		 * Tricky point here: readBuf contains the *last* block that the
-		 * LastRec record spans, not the one it starts in.	The last block
-		 * is indeed the one we want to use.
-		 */
-		Assert(readOff == (XLogCtl->xlblocks[0].xrecoff - BLCKSZ) % XLogSegSize);
-		memcpy((char *) Insert->currpage, readBuf, BLCKSZ);
-		Insert->currpos = (char *) Insert->currpage +
-			(EndOfLog.xrecoff + BLCKSZ - XLogCtl->xlblocks[0].xrecoff);
-		/* Make sure rest of page is zero */
-		memset(Insert->currpos, 0, INSERT_FREESPACE(Insert));
-	}
-
-	LogwrtResult.Write = LogwrtResult.Flush = EndOfLog;
-
-	XLogCtl->Write.LogwrtResult = LogwrtResult;
-	Insert->LogwrtResult = LogwrtResult;
-	XLogCtl->LogwrtResult = LogwrtResult;
-
-	XLogCtl->LogwrtRqst.Write = EndOfLog;
-	XLogCtl->LogwrtRqst.Flush = EndOfLog;
-
-#ifdef NOT_USED
-	/* UNDO */
-	if (InRecovery)
-	{
-		RecPtr = ReadRecPtr;
-		if (XLByteLT(checkPoint.undo, RecPtr))
-		{
-			elog(LOG, "undo starts at %X/%X",
-				 RecPtr.xlogid, RecPtr.xrecoff);
-			do
-			{
-				record = ReadRecord(&RecPtr, PANIC, buffer);
-				if (TransactionIdIsValid(record->xl_xid) &&
-					!TransactionIdDidCommit(record->xl_xid))
-					RmgrTable[record->xl_rmid].rm_undo(EndRecPtr, record);
-				RecPtr = record->xl_prev;
-			} while (XLByteLE(checkPoint.undo, RecPtr));
-			elog(LOG, "undo done at %X/%X",
-				 ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
-		}
-		else
-			elog(LOG, "undo is not required");
-	}
-#endif
-
-	if (InRecovery)
-	{
-		/*
-		 * In case we had to use the secondary checkpoint, make sure that
-		 * it will still be shown as the secondary checkpoint after this
-		 * CreateCheckPoint operation; we don't want the broken primary
-		 * checkpoint to become prevCheckPoint...
-		 */
-		ControlFile->checkPoint = checkPointLoc;
-		CreateCheckPoint(true);
-		XLogCloseRelationCache();
-	}
-
-	/*
-	 * Preallocate additional log files, if wanted.
-	 */
-	PreallocXlogFiles(EndOfLog);
-
-	InRecovery = false;
-
-	ControlFile->state = DB_IN_PRODUCTION;
-	ControlFile->time = time(NULL);
-	UpdateControlFile();
-
-	ThisStartUpID++;
-	XLogCtl->ThisStartUpID = ThisStartUpID;
-
-	/* Start up the commit log, too */
-	StartupCLOG();
-
-	elog(LOG, "database system is ready");
-	CritSectionCount--;
-
-	/* Shut down readFile facility, free space */
-	if (readFile >= 0)
-	{
-		close(readFile);
-		readFile = -1;
-	}
-	if (readBuf)
-	{
-		free(readBuf);
-		readBuf = NULL;
-	}
-
-	free(buffer);
-}
-
-/*
- * Subroutine to try to fetch and validate a prior checkpoint record.
- * whichChkpt = 1 for "primary", 2 for "secondary", merely informative
- */
-static XLogRecord *
-ReadCheckpointRecord(XLogRecPtr RecPtr,
-					 int whichChkpt,
-					 char *buffer)
-{
-	XLogRecord *record;
-
-	if (!XRecOffIsValid(RecPtr.xrecoff))
-	{
-		elog(LOG, (whichChkpt == 1 ?
-				   "invalid primary checkpoint link in control file" :
-				   "invalid secondary checkpoint link in control file"));
-		return NULL;
-	}
-
-	record = ReadRecord(&RecPtr, LOG, buffer);
-
-	if (record == NULL)
-	{
-		elog(LOG, (whichChkpt == 1 ?
-				   "invalid primary checkpoint record" :
-				   "invalid secondary checkpoint record"));
-		return NULL;
-	}
-	if (record->xl_rmid != RM_XLOG_ID)
-	{
-		elog(LOG, (whichChkpt == 1 ?
-			 "invalid resource manager id in primary checkpoint record" :
-		  "invalid resource manager id in secondary checkpoint record"));
-		return NULL;
-	}
-	if (record->xl_info != XLOG_CHECKPOINT_SHUTDOWN &&
-		record->xl_info != XLOG_CHECKPOINT_ONLINE)
-	{
-		elog(LOG, (whichChkpt == 1 ?
-				   "invalid xl_info in primary checkpoint record" :
-				   "invalid xl_info in secondary checkpoint record"));
-		return NULL;
-	}
-	if (record->xl_len != sizeof(CheckPoint))
-	{
-		elog(LOG, (whichChkpt == 1 ?
-				   "invalid length of primary checkpoint record" :
-				   "invalid length of secondary checkpoint record"));
-		return NULL;
-	}
-	return record;
-}
-
-/*
- * Postmaster uses this to initialize ThisStartUpID & RedoRecPtr from
- * XLogCtlData located in shmem after successful startup.
- */
-void
-SetThisStartUpID(void)
-{
-	ThisStartUpID = XLogCtl->ThisStartUpID;
-	RedoRecPtr = XLogCtl->SavedRedoRecPtr;
-}
-
-/*
- * CheckPoint process called by postmaster saves copy of new RedoRecPtr
- * in shmem (using SetSavedRedoRecPtr).  When checkpointer completes,
- * postmaster calls GetSavedRedoRecPtr to update its own copy of RedoRecPtr,
- * so that subsequently-spawned backends will start out with a reasonably
- * up-to-date local RedoRecPtr.  Since these operations are not protected by
- * any lock and copying an XLogRecPtr isn't atomic, it's unsafe to use either
- * of these routines at other times!
- */
-void
-SetSavedRedoRecPtr(void)
-{
-	XLogCtl->SavedRedoRecPtr = RedoRecPtr;
-}
-
-void
-GetSavedRedoRecPtr(void)
-{
-	RedoRecPtr = XLogCtl->SavedRedoRecPtr;
-}
-
-/*
- * Once spawned, a backend may update its local RedoRecPtr from
- * XLogCtl->Insert.RedoRecPtr; it must hold the insert lock or info_lck
- * to do so.  This is done in XLogInsert() or GetRedoRecPtr().
- */
-XLogRecPtr
-GetRedoRecPtr(void)
-{
-	/* use volatile pointer to prevent code rearrangement */
-	volatile XLogCtlData *xlogctl = XLogCtl;
-
-	SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-	Assert(XLByteLE(RedoRecPtr, xlogctl->Insert.RedoRecPtr));
-	RedoRecPtr = xlogctl->Insert.RedoRecPtr;
-	SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-
-	return RedoRecPtr;
-}
-
-/*
- * This must be called ONCE during postmaster or standalone-backend shutdown
- */
-void
-ShutdownXLOG(void)
-{
-	elog(LOG, "shutting down");
-
-	/* suppress in-transaction check in CreateCheckPoint */
-	MyLastRecPtr.xrecoff = 0;
-	MyXactMadeXLogEntry = false;
-
-	CritSectionCount++;
-	CreateDummyCaches();
-	CreateCheckPoint(true);
-	ShutdownCLOG();
-	CritSectionCount--;
-
-	elog(LOG, "database system is shut down");
-}
-
-/*
- * Perform a checkpoint --- either during shutdown, or on-the-fly
- */
-void
-CreateCheckPoint(bool shutdown)
-{
-	CheckPoint	checkPoint;
-	XLogRecPtr	recptr;
-	XLogCtlInsert *Insert = &XLogCtl->Insert;
-	XLogRecData rdata;
-	uint32		freespace;
-	uint32		_logId;
-	uint32		_logSeg;
-
-	if (MyXactMadeXLogEntry)
-		elog(ERROR, "CreateCheckPoint: cannot be called inside transaction block");
-
-	/*
-	 * The CheckpointLock can be held for quite a while, which is not good
-	 * because we won't respond to a cancel/die request while waiting for
-	 * an LWLock.  (But the alternative of using a regular lock won't work
-	 * for background checkpoint processes, which are not regular
-	 * backends.) So, rather than use a plain LWLockAcquire, use this
-	 * kluge to allow an interrupt to be accepted while we are waiting:
-	 */
-	while (!LWLockConditionalAcquire(CheckpointLock, LW_EXCLUSIVE))
-	{
-		CHECK_FOR_INTERRUPTS();
-		sleep(1);
-	}
-
-	START_CRIT_SECTION();
-
-	if (shutdown)
-	{
-		ControlFile->state = DB_SHUTDOWNING;
-		ControlFile->time = time(NULL);
-		UpdateControlFile();
-	}
-
-	memset(&checkPoint, 0, sizeof(checkPoint));
-	checkPoint.ThisStartUpID = ThisStartUpID;
-	checkPoint.time = time(NULL);
-
-	LWLockAcquire(WALInsertLock, LW_EXCLUSIVE);
-
-	/*
-	 * If this isn't a shutdown, and we have not inserted any XLOG records
-	 * since the start of the last checkpoint, skip the checkpoint.  The
-	 * idea here is to avoid inserting duplicate checkpoints when the
-	 * system is idle.	That wastes log space, and more importantly it
-	 * exposes us to possible loss of both current and previous checkpoint
-	 * records if the machine crashes just as we're writing the update.
-	 * (Perhaps it'd make even more sense to checkpoint only when the
-	 * previous checkpoint record is in a different xlog page?)
-	 *
-	 * We have to make two tests to determine that nothing has happened since
-	 * the start of the last checkpoint: current insertion point must
-	 * match the end of the last checkpoint record, and its redo pointer
-	 * must point to itself.
-	 */
-	if (!shutdown)
-	{
-		XLogRecPtr	curInsert;
-
-		INSERT_RECPTR(curInsert, Insert, Insert->curridx);
-		if (curInsert.xlogid == ControlFile->checkPoint.xlogid &&
-			curInsert.xrecoff == ControlFile->checkPoint.xrecoff +
-			MAXALIGN(SizeOfXLogRecord + sizeof(CheckPoint)) &&
-			ControlFile->checkPoint.xlogid ==
-			ControlFile->checkPointCopy.redo.xlogid &&
-			ControlFile->checkPoint.xrecoff ==
-			ControlFile->checkPointCopy.redo.xrecoff)
-		{
-			LWLockRelease(WALInsertLock);
-			LWLockRelease(CheckpointLock);
-			END_CRIT_SECTION();
-			return;
-		}
-	}
-
-	/*
-	 * Compute new REDO record ptr = location of next XLOG record.
-	 *
-	 * NB: this is NOT necessarily where the checkpoint record itself will
-	 * be, since other backends may insert more XLOG records while we're
-	 * off doing the buffer flush work.  Those XLOG records are logically
-	 * after the checkpoint, even though physically before it.	Got that?
-	 */
-	freespace = INSERT_FREESPACE(Insert);
-	if (freespace < SizeOfXLogRecord)
-	{
-		(void) AdvanceXLInsertBuffer();
-		/* OK to ignore update return flag, since we will do flush anyway */
-		freespace = BLCKSZ - SizeOfXLogPHD;
-	}
-	INSERT_RECPTR(checkPoint.redo, Insert, Insert->curridx);
-
-	/*
-	 * Here we update the shared RedoRecPtr for future XLogInsert calls;
-	 * this must be done while holding the insert lock AND the info_lck.
-	 */
-	{
-		/* use volatile pointer to prevent code rearrangement */
-		volatile XLogCtlData *xlogctl = XLogCtl;
-
-		SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
-		RedoRecPtr = xlogctl->Insert.RedoRecPtr = checkPoint.redo;
-		SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
-	}
-
-	/*
-	 * Get UNDO record ptr - this is oldest of PGPROC->logRec values. We do
-	 * this while holding insert lock to ensure that we won't miss any
-	 * about-to-commit transactions (UNDO must include all xacts that have
-	 * commits after REDO point).
-	 *
-	 * XXX temporarily ifdef'd out to avoid three-way deadlock condition:
-	 * GetUndoRecPtr needs to grab SInvalLock to ensure that it is looking
-	 * at a stable set of proc records, but grabbing SInvalLock while holding
-	 * WALInsertLock is no good.  GetNewTransactionId may cause a WAL record
-	 * to be written while holding XidGenLock, and GetSnapshotData needs to
-	 * get XidGenLock while holding SInvalLock, so there's a risk of deadlock.
-	 * Need to find a better solution.  See pgsql-hackers discussion of
-	 * 17-Dec-01.
-	 */
-#ifdef NOT_USED
-	checkPoint.undo = GetUndoRecPtr();
-
-	if (shutdown && checkPoint.undo.xrecoff != 0)
-		elog(PANIC, "active transaction while database system is shutting down");
-#endif
-
-	/*
-	 * Now we can release insert lock, allowing other xacts to proceed
-	 * even while we are flushing disk buffers.
-	 */
-	LWLockRelease(WALInsertLock);
-
-	LWLockAcquire(XidGenLock, LW_SHARED);
-	checkPoint.nextXid = ShmemVariableCache->nextXid;
-	LWLockRelease(XidGenLock);
-
-	LWLockAcquire(OidGenLock, LW_SHARED);
-	checkPoint.nextOid = ShmemVariableCache->nextOid;
-	if (!shutdown)
-		checkPoint.nextOid += ShmemVariableCache->oidCount;
-	LWLockRelease(OidGenLock);
-
-	/*
-	 * Having constructed the checkpoint record, ensure all shmem disk
-	 * buffers are flushed to disk.
-	 */
-	FlushBufferPool();
-
-	/* And commit-log buffers, too */
-	CheckPointCLOG();
-
-	/*
-	 * Now insert the checkpoint record into XLOG.
-	 */
-	rdata.buffer = InvalidBuffer;
-	rdata.data = (char *) (&checkPoint);
-	rdata.len = sizeof(checkPoint);
-	rdata.next = NULL;
-
-	recptr = XLogInsert(RM_XLOG_ID,
-						shutdown ? XLOG_CHECKPOINT_SHUTDOWN :
-						XLOG_CHECKPOINT_ONLINE,
-						&rdata);
-
-	XLogFlush(recptr);
-
-	/*
-	 * We now have ProcLastRecPtr = start of actual checkpoint record,
-	 * recptr = end of actual checkpoint record.
-	 */
-	if (shutdown && !XLByteEQ(checkPoint.redo, ProcLastRecPtr))
-		elog(PANIC, "concurrent transaction log activity while database system is shutting down");
-
-	/*
-	 * Select point at which we can truncate the log, which we base on the
-	 * prior checkpoint's earliest info.
-	 *
-	 * With UNDO support: oldest item is redo or undo, whichever is older;
-	 * but watch out for case that undo = 0.
-	 *
-	 * Without UNDO support: just use the redo pointer.  This allows xlog
-	 * space to be freed much faster when there are long-running
-	 * transactions.
-	 */
-#ifdef NOT_USED
-	if (ControlFile->checkPointCopy.undo.xrecoff != 0 &&
-		XLByteLT(ControlFile->checkPointCopy.undo,
-				 ControlFile->checkPointCopy.redo))
-		XLByteToSeg(ControlFile->checkPointCopy.undo, _logId, _logSeg);
-	else
-#endif
-		XLByteToSeg(ControlFile->checkPointCopy.redo, _logId, _logSeg);
-
-	/*
-	 * Update the control file.
-	 */
-	LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
-	if (shutdown)
-		ControlFile->state = DB_SHUTDOWNED;
-	ControlFile->prevCheckPoint = ControlFile->checkPoint;
-	ControlFile->checkPoint = ProcLastRecPtr;
-	ControlFile->checkPointCopy = checkPoint;
-	ControlFile->time = time(NULL);
-	UpdateControlFile();
-	LWLockRelease(ControlFileLock);
-
-	/*
-	 * Delete offline log files (those no longer needed even for previous
-	 * checkpoint).
-	 */
-	if (_logId || _logSeg)
-	{
-		PrevLogSeg(_logId, _logSeg);
-		MoveOfflineLogs(_logId, _logSeg, recptr);
-	}
-
-	/*
-	 * Make more log segments if needed.  (Do this after deleting offline
-	 * log segments, to avoid having peak disk space usage higher than
-	 * necessary.)
-	 */
-	if (!shutdown)
-		PreallocXlogFiles(recptr);
-
-	LWLockRelease(CheckpointLock);
-
-	END_CRIT_SECTION();
-}
-
-/*
- * Write a NEXTOID log record
- */
-void
-XLogPutNextOid(Oid nextOid)
-{
-	XLogRecData rdata;
-
-	rdata.buffer = InvalidBuffer;
-	rdata.data = (char *) (&nextOid);
-	rdata.len = sizeof(Oid);
-	rdata.next = NULL;
-	(void) XLogInsert(RM_XLOG_ID, XLOG_NEXTOID, &rdata);
-}
-
-/*
- * XLOG resource manager's routines
- */
-void
-xlog_redo(XLogRecPtr lsn, XLogRecord *record)
-{
-	uint8		info = record->xl_info & ~XLR_INFO_MASK;
-
-	if (info == XLOG_NEXTOID)
-	{
-		Oid			nextOid;
-
-		memcpy(&nextOid, XLogRecGetData(record), sizeof(Oid));
-		if (ShmemVariableCache->nextOid < nextOid)
-		{
-			ShmemVariableCache->nextOid = nextOid;
-			ShmemVariableCache->oidCount = 0;
-		}
-	}
-	else if (info == XLOG_CHECKPOINT_SHUTDOWN)
-	{
-		CheckPoint	checkPoint;
-
-		memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
-		/* In a SHUTDOWN checkpoint, believe the counters exactly */
-		ShmemVariableCache->nextXid = checkPoint.nextXid;
-		ShmemVariableCache->nextOid = checkPoint.nextOid;
-		ShmemVariableCache->oidCount = 0;
-	}
-	else if (info == XLOG_CHECKPOINT_ONLINE)
-	{
-		CheckPoint	checkPoint;
-
-		memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
-		/* In an ONLINE checkpoint, treat the counters like NEXTOID */
-		if (TransactionIdPrecedes(ShmemVariableCache->nextXid,
-								  checkPoint.nextXid))
-			ShmemVariableCache->nextXid = checkPoint.nextXid;
-		if (ShmemVariableCache->nextOid < checkPoint.nextOid)
-		{
-			ShmemVariableCache->nextOid = checkPoint.nextOid;
-			ShmemVariableCache->oidCount = 0;
-		}
-	}
-}
-
-void
-xlog_undo(XLogRecPtr lsn, XLogRecord *record)
-{
-}
-
-void
-xlog_desc(char *buf, uint8 xl_info, char *rec)
-{
-	uint8		info = xl_info & ~XLR_INFO_MASK;
-
-	if (info == XLOG_CHECKPOINT_SHUTDOWN ||
-		info == XLOG_CHECKPOINT_ONLINE)
-	{
-		CheckPoint *checkpoint = (CheckPoint *) rec;
-
-		sprintf(buf + strlen(buf), "checkpoint: redo %X/%X; undo %X/%X; "
-				"sui %u; xid %u; oid %u; %s",
-				checkpoint->redo.xlogid, checkpoint->redo.xrecoff,
-				checkpoint->undo.xlogid, checkpoint->undo.xrecoff,
-				checkpoint->ThisStartUpID, checkpoint->nextXid,
-				checkpoint->nextOid,
-			 (info == XLOG_CHECKPOINT_SHUTDOWN) ? "shutdown" : "online");
-	}
-	else if (info == XLOG_NEXTOID)
-	{
-		Oid			nextOid;
-
-		memcpy(&nextOid, rec, sizeof(Oid));
-		sprintf(buf + strlen(buf), "nextOid: %u", nextOid);
-	}
-	else
-		strcat(buf, "UNKNOWN");
-}
-
-static void
-xlog_outrec(char *buf, XLogRecord *record)
-{
-	int			bkpb;
-	int			i;
-
-	sprintf(buf + strlen(buf), "prev %X/%X; xprev %X/%X; xid %u",
-			record->xl_prev.xlogid, record->xl_prev.xrecoff,
-			record->xl_xact_prev.xlogid, record->xl_xact_prev.xrecoff,
-			record->xl_xid);
-
-	for (i = 0, bkpb = 0; i < XLR_MAX_BKP_BLOCKS; i++)
-	{
-		if (!(record->xl_info & (XLR_SET_BKP_BLOCK(i))))
-			continue;
-		bkpb++;
-	}
-
-	if (bkpb)
-		sprintf(buf + strlen(buf), "; bkpb %d", bkpb);
-
-	sprintf(buf + strlen(buf), ": %s",
-			RmgrTable[record->xl_rmid].rm_name);
-}
-
-
-/*
- * GUC support
- */
-const char *
-assign_xlog_sync_method(const char *method, bool doit, bool interactive)
-{
-	int			new_sync_method;
-	int			new_sync_bit;
-
-	if (strcasecmp(method, "fsync") == 0)
-	{
-		new_sync_method = SYNC_METHOD_FSYNC;
-		new_sync_bit = 0;
-	}
-#ifdef HAVE_FDATASYNC
-	else if (strcasecmp(method, "fdatasync") == 0)
-	{
-		new_sync_method = SYNC_METHOD_FDATASYNC;
-		new_sync_bit = 0;
-	}
-#endif
-#ifdef OPEN_SYNC_FLAG
-	else if (strcasecmp(method, "open_sync") == 0)
-	{
-		new_sync_method = SYNC_METHOD_OPEN;
-		new_sync_bit = OPEN_SYNC_FLAG;
-	}
-#endif
-#ifdef OPEN_DATASYNC_FLAG
-	else if (strcasecmp(method, "open_datasync") == 0)
-	{
-		new_sync_method = SYNC_METHOD_OPEN;
-		new_sync_bit = OPEN_DATASYNC_FLAG;
-	}
-#endif
-	else
-	{
-		return NULL;
-	}
-
-	if (!doit)
-		return method;
-
-	if (sync_method != new_sync_method || open_sync_bit != new_sync_bit)
-	{
-		/*
-		 * To ensure that no blocks escape unsynced, force an fsync on the
-		 * currently open log segment (if any).  Also, if the open flag is
-		 * changing, close the log file so it will be reopened (with new
-		 * flag bit) at next use.
-		 */
-		if (openLogFile >= 0)
-		{
-			if (pg_fsync(openLogFile) != 0)
-				elog(PANIC, "fsync of log file %u, segment %u failed: %m",
-					 openLogId, openLogSeg);
-			if (open_sync_bit != new_sync_bit)
-			{
-				if (close(openLogFile) != 0)
-					elog(PANIC, "close of log file %u, segment %u failed: %m",
-						 openLogId, openLogSeg);
-				openLogFile = -1;
-			}
-		}
-		sync_method = new_sync_method;
-		open_sync_bit = new_sync_bit;
-	}
-
-	return method;
-}
-
-
-/*
- * Issue appropriate kind of fsync (if any) on the current XLOG output file
- */
-static void
-issue_xlog_fsync(void)
-{
-	switch (sync_method)
-	{
-		case SYNC_METHOD_FSYNC:
-			if (pg_fsync(openLogFile) != 0)
-				elog(PANIC, "fsync of log file %u, segment %u failed: %m",
-					 openLogId, openLogSeg);
-			break;
-#ifdef HAVE_FDATASYNC
-		case SYNC_METHOD_FDATASYNC:
-			if (pg_fdatasync(openLogFile) != 0)
-				elog(PANIC, "fdatasync of log file %u, segment %u failed: %m",
-					 openLogId, openLogSeg);
-			break;
-#endif
-		case SYNC_METHOD_OPEN:
-			/* write synced it already */
-			break;
-		default:
-			elog(PANIC, "bogus wal_sync_method %d", sync_method);
-			break;
-	}
-}
-- 
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