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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    src/test/regress/sql/float4.sql
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    src/test/regress/sql/foreign_key.sql
    src/test/regress/sql/geometry.sql
    src/test/regress/sql/hash_index.sql
    src/test/regress/sql/horology.sql
    src/test/regress/sql/inet.sql
    src/test/regress/sql/inherit.sql
    src/test/regress/sql/insert.sql
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    src/test/regress/sql/opr_sanity.sql
    src/test/regress/sql/path.sql
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    src/test/regress/sql/reltime.sql
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    src/test/regress/sql/triggers.sql
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diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
deleted file mode 100644
index 1a86afb286e..00000000000
--- a/src/backend/storage/buffer/bufmgr.c
+++ /dev/null
@@ -1,2205 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * bufmgr.c
- *	  buffer manager interface routines
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.126 2002/06/20 20:29:34 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-/*
- *
- * BufferAlloc() -- lookup a buffer in the buffer table.  If
- *		it isn't there add it, but do not read data into memory.
- *		This is used when we are about to reinitialize the
- *		buffer so don't care what the current disk contents are.
- *		BufferAlloc() also pins the new buffer in memory.
- *
- * ReadBuffer() -- like BufferAlloc() but reads the data
- *		on a buffer cache miss.
- *
- * ReleaseBuffer() -- unpin the buffer
- *
- * WriteNoReleaseBuffer() -- mark the buffer contents as "dirty"
- *		but don't unpin.  The disk IO is delayed until buffer
- *		replacement.
- *
- * WriteBuffer() -- WriteNoReleaseBuffer() + ReleaseBuffer()
- *
- * BufferSync() -- flush all dirty buffers in the buffer pool.
- *
- * InitBufferPool() -- Init the buffer module.
- *
- * See other files:
- *		freelist.c -- chooses victim for buffer replacement
- *		buf_table.c -- manages the buffer lookup table
- */
-#include "postgres.h"
-
-#include <sys/types.h>
-#include <sys/file.h>
-#include <math.h>
-#include <signal.h>
-
-#include "lib/stringinfo.h"
-#include "miscadmin.h"
-#include "storage/buf_internals.h"
-#include "storage/bufmgr.h"
-#include "storage/proc.h"
-#include "storage/smgr.h"
-#include "utils/relcache.h"
-
-#include "pgstat.h"
-
-#define BufferGetLSN(bufHdr)	\
-	(*((XLogRecPtr*)MAKE_PTR((bufHdr)->data)))
-
-
-extern long int ReadBufferCount;
-extern long int ReadLocalBufferCount;
-extern long int BufferHitCount;
-extern long int LocalBufferHitCount;
-extern long int BufferFlushCount;
-extern long int LocalBufferFlushCount;
-
-static void WaitIO(BufferDesc *buf);
-static void StartBufferIO(BufferDesc *buf, bool forInput);
-static void TerminateBufferIO(BufferDesc *buf);
-static void ContinueBufferIO(BufferDesc *buf, bool forInput);
-extern void AbortBufferIO(void);
-
-/*
- * Macro : BUFFER_IS_BROKEN
- *		Note that write error doesn't mean the buffer broken
-*/
-#define BUFFER_IS_BROKEN(buf) ((buf->flags & BM_IO_ERROR) && !(buf->flags & BM_DIRTY))
-
-static Buffer ReadBufferInternal(Relation reln, BlockNumber blockNum,
-				   bool bufferLockHeld);
-static BufferDesc *BufferAlloc(Relation reln, BlockNumber blockNum,
-			bool *foundPtr);
-static int	ReleaseBufferWithBufferLock(Buffer buffer);
-static int	BufferReplace(BufferDesc *bufHdr);
-void		PrintBufferDescs(void);
-
-static void write_buffer(Buffer buffer, bool unpin);
-
-/*
- * ReadBuffer -- returns a buffer containing the requested
- *		block of the requested relation.  If the blknum
- *		requested is P_NEW, extend the relation file and
- *		allocate a new block.  (Caller is responsible for
- *		ensuring that only one backend tries to extend a
- *		relation at the same time!)
- *
- * Returns: the buffer number for the buffer containing
- *		the block read, or NULL on an error.  If successful,
- *		the returned buffer has been pinned.
- *
- * Assume when this function is called, that reln has been
- *		opened already.
- *
- * Note: a side effect of a P_NEW call is to update reln->rd_nblocks.
- */
-
-#undef ReadBuffer				/* conflicts with macro when BUFMGR_DEBUG
-								 * defined */
-
-/*
- * ReadBuffer
- */
-Buffer
-ReadBuffer(Relation reln, BlockNumber blockNum)
-{
-	return ReadBufferInternal(reln, blockNum, false);
-}
-
-/*
- * ReadBufferInternal -- internal version of ReadBuffer with more options
- *
- * bufferLockHeld: if true, caller already acquired the bufmgr lock.
- * (This is assumed never to be true if dealing with a local buffer!)
- */
-static Buffer
-ReadBufferInternal(Relation reln, BlockNumber blockNum,
-				   bool bufferLockHeld)
-{
-	BufferDesc *bufHdr;
-	int			status;
-	bool		found;
-	bool		isExtend;
-	bool		isLocalBuf;
-
-	isExtend = (blockNum == P_NEW);
-	isLocalBuf = reln->rd_myxactonly;
-
-	if (isLocalBuf)
-	{
-		ReadLocalBufferCount++;
-		pgstat_count_buffer_read(&reln->pgstat_info, reln);
-		/* Substitute proper block number if caller asked for P_NEW */
-		if (isExtend)
-		{
-			blockNum = reln->rd_nblocks;
-			reln->rd_nblocks++;
-		}
-		bufHdr = LocalBufferAlloc(reln, blockNum, &found);
-		if (found)
-		{
-			LocalBufferHitCount++;
-			pgstat_count_buffer_hit(&reln->pgstat_info, reln);
-		}
-	}
-	else
-	{
-		ReadBufferCount++;
-		pgstat_count_buffer_read(&reln->pgstat_info, reln);
-		/* Substitute proper block number if caller asked for P_NEW */
-		if (isExtend)
-		{
-			/* must be sure we have accurate file length! */
-			blockNum = reln->rd_nblocks = smgrnblocks(DEFAULT_SMGR, reln);
-			reln->rd_nblocks++;
-		}
-
-		/*
-		 * lookup the buffer.  IO_IN_PROGRESS is set if the requested
-		 * block is not currently in memory.
-		 */
-		if (!bufferLockHeld)
-			LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		bufHdr = BufferAlloc(reln, blockNum, &found);
-		if (found)
-		{
-			BufferHitCount++;
-			pgstat_count_buffer_hit(&reln->pgstat_info, reln);
-		}
-	}
-
-	/* At this point we do NOT hold the bufmgr lock. */
-
-	if (!bufHdr)
-		return InvalidBuffer;
-
-	/* if it's already in the buffer pool, we're done */
-	if (found)
-	{
-		/* That is, we're done if we expected to be able to find it ... */
-		if (!isExtend)
-			return BufferDescriptorGetBuffer(bufHdr);
-
-		/*
-		 * If we found a buffer when we were expecting to extend the
-		 * relation, the implication is that a buffer was already created
-		 * for the next page position, but then smgrextend failed to write
-		 * the page. We'd better try the smgrextend again.  But since
-		 * BufferAlloc won't have done StartBufferIO, we must do that
-		 * first.
-		 */
-		if (!isLocalBuf)
-		{
-			LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-			StartBufferIO(bufHdr, false);
-			LWLockRelease(BufMgrLock);
-		}
-	}
-
-	/*
-	 * if we have gotten to this point, the reln pointer must be ok and
-	 * the relation file must be open.
-	 */
-	if (isExtend)
-	{
-		/* new buffers are zero-filled */
-		MemSet((char *) MAKE_PTR(bufHdr->data), 0, BLCKSZ);
-		status = smgrextend(DEFAULT_SMGR, reln, blockNum,
-							(char *) MAKE_PTR(bufHdr->data));
-	}
-	else
-	{
-		status = smgrread(DEFAULT_SMGR, reln, blockNum,
-						  (char *) MAKE_PTR(bufHdr->data));
-	}
-
-	if (isLocalBuf)
-	{
-		/* No shared buffer state to update... */
-		if (status == SM_FAIL)
-		{
-			bufHdr->flags |= BM_IO_ERROR;
-			return InvalidBuffer;
-		}
-		return BufferDescriptorGetBuffer(bufHdr);
-	}
-
-	/* lock buffer manager again to update IO IN PROGRESS */
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	if (status == SM_FAIL)
-	{
-		/* IO Failed.  cleanup the data structures and go home */
-
-		if (!BufTableDelete(bufHdr))
-		{
-			LWLockRelease(BufMgrLock);
-			elog(FATAL, "BufRead: buffer table broken after IO error");
-		}
-		/* remember that BufferAlloc() pinned the buffer */
-		UnpinBuffer(bufHdr);
-
-		/*
-		 * Have to reset the flag so that anyone waiting for the buffer
-		 * can tell that the contents are invalid.
-		 */
-		bufHdr->flags |= BM_IO_ERROR;
-		bufHdr->flags &= ~BM_IO_IN_PROGRESS;
-	}
-	else
-	{
-		/* IO Succeeded.  clear the flags, finish buffer update */
-
-		bufHdr->flags &= ~(BM_IO_ERROR | BM_IO_IN_PROGRESS);
-	}
-
-	/* If anyone was waiting for IO to complete, wake them up now */
-	TerminateBufferIO(bufHdr);
-
-	LWLockRelease(BufMgrLock);
-
-	if (status == SM_FAIL)
-		return InvalidBuffer;
-
-	return BufferDescriptorGetBuffer(bufHdr);
-}
-
-/*
- * BufferAlloc -- Get a buffer from the buffer pool but don't
- *		read it.  If successful, the returned buffer is pinned.
- *
- * Returns: descriptor for buffer
- *
- * BufMgrLock must be held at entry.  When this routine returns,
- * the BufMgrLock is guaranteed NOT to be held.
- */
-static BufferDesc *
-BufferAlloc(Relation reln,
-			BlockNumber blockNum,
-			bool *foundPtr)
-{
-	BufferDesc *buf,
-			   *buf2;
-	BufferTag	newTag;			/* identity of requested block */
-	bool		inProgress;		/* buffer undergoing IO */
-
-	/* create a new tag so we can lookup the buffer */
-	/* assume that the relation is already open */
-	INIT_BUFFERTAG(&newTag, reln, blockNum);
-
-	/* see if the block is in the buffer pool already */
-	buf = BufTableLookup(&newTag);
-	if (buf != NULL)
-	{
-		/*
-		 * Found it.  Now, (a) pin the buffer so no one steals it from the
-		 * buffer pool, (b) check IO_IN_PROGRESS, someone may be faulting
-		 * the buffer into the buffer pool.
-		 */
-
-		PinBuffer(buf);
-		inProgress = (buf->flags & BM_IO_IN_PROGRESS);
-
-		*foundPtr = TRUE;
-		if (inProgress)			/* confirm end of IO */
-		{
-			WaitIO(buf);
-			inProgress = (buf->flags & BM_IO_IN_PROGRESS);
-		}
-		if (BUFFER_IS_BROKEN(buf))
-		{
-			/*
-			 * I couldn't understand the following old comment. If there's
-			 * no IO for the buffer and the buffer is BROKEN,it should be
-			 * read again. So start a new buffer IO here.
-			 *
-			 * wierd race condition:
-			 *
-			 * We were waiting for someone else to read the buffer. While we
-			 * were waiting, the reader boof'd in some way, so the
-			 * contents of the buffer are still invalid.  By saying that
-			 * we didn't find it, we can make the caller reinitialize the
-			 * buffer.	If two processes are waiting for this block, both
-			 * will read the block.  The second one to finish may
-			 * overwrite any updates made by the first.  (Assume higher
-			 * level synchronization prevents this from happening).
-			 *
-			 * This is never going to happen, don't worry about it.
-			 */
-			*foundPtr = FALSE;
-		}
-#ifdef BMTRACE
-		_bm_trace((reln->rd_rel->relisshared ? 0 : MyDatabaseId), RelationGetRelid(reln), blockNum, BufferDescriptorGetBuffer(buf), BMT_ALLOCFND);
-#endif   /* BMTRACE */
-
-		if (!(*foundPtr))
-			StartBufferIO(buf, true);
-		LWLockRelease(BufMgrLock);
-
-		return buf;
-	}
-
-	*foundPtr = FALSE;
-
-	/*
-	 * Didn't find it in the buffer pool.  We'll have to initialize a new
-	 * buffer.	First, grab one from the free list.  If it's dirty, flush
-	 * it to disk. Remember to unlock BufMgrLock while doing the IOs.
-	 */
-	inProgress = FALSE;
-	for (buf = (BufferDesc *) NULL; buf == (BufferDesc *) NULL;)
-	{
-		buf = GetFreeBuffer();
-
-		/* GetFreeBuffer will abort if it can't find a free buffer */
-		Assert(buf);
-
-		/*
-		 * There should be exactly one pin on the buffer after it is
-		 * allocated -- ours.  If it had a pin it wouldn't have been on
-		 * the free list.  No one else could have pinned it between
-		 * GetFreeBuffer and here because we have the BufMgrLock.
-		 */
-		Assert(buf->refcount == 0);
-		buf->refcount = 1;
-		PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 1;
-
-		if (buf->flags & BM_DIRTY || buf->cntxDirty)
-		{
-			bool		smok;
-
-			/*
-			 * skip write error buffers
-			 */
-			if ((buf->flags & BM_IO_ERROR) != 0)
-			{
-				UnpinBuffer(buf);
-				buf = (BufferDesc *) NULL;
-				continue;
-			}
-
-			/*
-			 * Set BM_IO_IN_PROGRESS to keep anyone from doing anything
-			 * with the contents of the buffer while we write it out. We
-			 * don't really care if they try to read it, but if they can
-			 * complete a BufferAlloc on it they can then scribble into
-			 * it, and we'd really like to avoid that while we are
-			 * flushing the buffer.  Setting this flag should block them
-			 * in WaitIO until we're done.
-			 */
-			inProgress = TRUE;
-
-			/*
-			 * All code paths that acquire this lock pin the buffer first;
-			 * since no one had it pinned (it just came off the free
-			 * list), no one else can have this lock.
-			 */
-			StartBufferIO(buf, false);
-
-			/*
-			 * Write the buffer out, being careful to release BufMgrLock
-			 * before starting the I/O.
-			 */
-			smok = BufferReplace(buf);
-
-			if (smok == FALSE)
-			{
-				elog(WARNING, "BufferAlloc: cannot write block %u for %u/%u",
-					 buf->tag.blockNum,
-					 buf->tag.rnode.tblNode, buf->tag.rnode.relNode);
-				inProgress = FALSE;
-				buf->flags |= BM_IO_ERROR;
-				buf->flags &= ~BM_IO_IN_PROGRESS;
-				TerminateBufferIO(buf);
-				UnpinBuffer(buf);
-				buf = (BufferDesc *) NULL;
-			}
-			else
-			{
-				/*
-				 * BM_JUST_DIRTIED cleared by BufferReplace and shouldn't
-				 * be setted by anyone.		- vadim 01/17/97
-				 */
-				if (buf->flags & BM_JUST_DIRTIED)
-				{
-					elog(PANIC, "BufferAlloc: content of block %u (%u/%u) changed while flushing",
-						 buf->tag.blockNum,
-						 buf->tag.rnode.tblNode, buf->tag.rnode.relNode);
-				}
-				else
-					buf->flags &= ~BM_DIRTY;
-				buf->cntxDirty = false;
-			}
-
-			/*
-			 * Somebody could have pinned the buffer while we were doing
-			 * the I/O and had given up the BufMgrLock (though they would
-			 * be waiting for us to clear the BM_IO_IN_PROGRESS flag).
-			 * That's why this is a loop -- if so, we need to clear the
-			 * I/O flags, remove our pin and start all over again.
-			 *
-			 * People may be making buffers free at any time, so there's no
-			 * reason to think that we have an immediate disaster on our
-			 * hands.
-			 */
-			if (buf && buf->refcount > 1)
-			{
-				inProgress = FALSE;
-				buf->flags &= ~BM_IO_IN_PROGRESS;
-				TerminateBufferIO(buf);
-				UnpinBuffer(buf);
-				buf = (BufferDesc *) NULL;
-			}
-
-			/*
-			 * Somebody could have allocated another buffer for the same
-			 * block we are about to read in. (While we flush out the
-			 * dirty buffer, we don't hold the lock and someone could have
-			 * allocated another buffer for the same block. The problem is
-			 * we haven't gotten around to insert the new tag into the
-			 * buffer table. So we need to check here.		-ay 3/95
-			 */
-			buf2 = BufTableLookup(&newTag);
-			if (buf2 != NULL)
-			{
-				/*
-				 * Found it. Someone has already done what we're about to
-				 * do. We'll just handle this as if it were found in the
-				 * buffer pool in the first place.
-				 */
-				if (buf != NULL)
-				{
-					buf->flags &= ~BM_IO_IN_PROGRESS;
-					TerminateBufferIO(buf);
-					/* give up old buffer since we don't need it any more */
-					UnpinBuffer(buf);
-				}
-
-				PinBuffer(buf2);
-				inProgress = (buf2->flags & BM_IO_IN_PROGRESS);
-
-				*foundPtr = TRUE;
-				if (inProgress)
-				{
-					WaitIO(buf2);
-					inProgress = (buf2->flags & BM_IO_IN_PROGRESS);
-				}
-				if (BUFFER_IS_BROKEN(buf2))
-					*foundPtr = FALSE;
-
-				if (!(*foundPtr))
-					StartBufferIO(buf2, true);
-				LWLockRelease(BufMgrLock);
-
-				return buf2;
-			}
-		}
-	}
-
-	/*
-	 * At this point we should have the sole pin on a non-dirty buffer and
-	 * we may or may not already have the BM_IO_IN_PROGRESS flag set.
-	 */
-
-	/*
-	 * Change the name of the buffer in the lookup table:
-	 *
-	 * Need to update the lookup table before the read starts. If someone
-	 * comes along looking for the buffer while we are reading it in, we
-	 * don't want them to allocate a new buffer.  For the same reason, we
-	 * didn't want to erase the buf table entry for the buffer we were
-	 * writing back until now, either.
-	 */
-
-	if (!BufTableDelete(buf))
-	{
-		LWLockRelease(BufMgrLock);
-		elog(FATAL, "buffer wasn't in the buffer table");
-	}
-
-	INIT_BUFFERTAG(&(buf->tag), reln, blockNum);
-
-	if (!BufTableInsert(buf))
-	{
-		LWLockRelease(BufMgrLock);
-		elog(FATAL, "Buffer in lookup table twice");
-	}
-
-	/*
-	 * Buffer contents are currently invalid.  Have to mark IO IN PROGRESS
-	 * so no one fiddles with them until the read completes.  If this
-	 * routine has been called simply to allocate a buffer, no io will be
-	 * attempted, so the flag isnt set.
-	 */
-	if (!inProgress)
-		StartBufferIO(buf, true);
-	else
-		ContinueBufferIO(buf, true);
-
-#ifdef BMTRACE
-	_bm_trace((reln->rd_rel->relisshared ? 0 : MyDatabaseId), RelationGetRelid(reln), blockNum, BufferDescriptorGetBuffer(buf), BMT_ALLOCNOTFND);
-#endif   /* BMTRACE */
-
-	LWLockRelease(BufMgrLock);
-
-	return buf;
-}
-
-/*
- * write_buffer -- common functionality for
- *                 WriteBuffer and WriteNoReleaseBuffer
- */
-static void
-write_buffer(Buffer buffer, bool release)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsLocal(buffer))
-	{
-		WriteLocalBuffer(buffer, release);
-		return;
-	}
-
-	if (BAD_BUFFER_ID(buffer))
-		elog(ERROR, "write_buffer: bad buffer %d", buffer);
-
-	bufHdr = &BufferDescriptors[buffer - 1];
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-	Assert(bufHdr->refcount > 0);
-
-	bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
-
-	if (release)
-		UnpinBuffer(bufHdr);
-	LWLockRelease(BufMgrLock);
-}
-
-/*
- * WriteBuffer
- *
- *		Marks buffer contents as dirty (actual write happens later).
- *
- * Assume that buffer is pinned.  Assume that reln is
- *		valid.
- *
- * Side Effects:
- *		Pin count is decremented.
- */
-
-#undef WriteBuffer
-
-void
-WriteBuffer(Buffer buffer)
-{
-	write_buffer(buffer, true);
-}
-
-/*
- * WriteNoReleaseBuffer -- like WriteBuffer, but do not unpin the buffer
- *						   when the operation is complete.
- */
-void
-WriteNoReleaseBuffer(Buffer buffer)
-{
-	write_buffer(buffer, false);
-}
-
-
-#undef ReleaseAndReadBuffer
-/*
- * ReleaseAndReadBuffer -- combine ReleaseBuffer() and ReadBuffer()
- *		to save a lock release/acquire.
- *
- * Also, if the passed buffer is valid and already contains the desired block
- * number, we simply return it without ever acquiring the lock at all.
- * Since the passed buffer must be pinned, it's OK to examine its block
- * number without getting the lock first.
- *
- * Note: it is OK to pass buffer = InvalidBuffer, indicating that no old
- * buffer actually needs to be released.  This case is the same as ReadBuffer,
- * but can save some tests in the caller.
- *
- * Also note: while it will work to call this routine with blockNum == P_NEW,
- * it's best to avoid doing so, since that would result in calling
- * smgrnblocks() while holding the bufmgr lock, hence some loss of
- * concurrency.
- */
-Buffer
-ReleaseAndReadBuffer(Buffer buffer,
-					 Relation relation,
-					 BlockNumber blockNum)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsValid(buffer))
-	{
-		if (BufferIsLocal(buffer))
-		{
-			Assert(LocalRefCount[-buffer - 1] > 0);
-			bufHdr = &LocalBufferDescriptors[-buffer - 1];
-			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
-				return buffer;
-			LocalRefCount[-buffer - 1]--;
-		}
-		else
-		{
-			Assert(PrivateRefCount[buffer - 1] > 0);
-			bufHdr = &BufferDescriptors[buffer - 1];
-			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
-				return buffer;
-			if (PrivateRefCount[buffer - 1] > 1)
-				PrivateRefCount[buffer - 1]--;
-			else
-			{
-				LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-				UnpinBuffer(bufHdr);
-				return ReadBufferInternal(relation, blockNum, true);
-			}
-		}
-	}
-
-	return ReadBufferInternal(relation, blockNum, false);
-}
-
-/*
- * BufferSync -- Write all dirty buffers in the pool.
- *
- * This is called at checkpoint time and write out all dirty buffers.
- */
-void
-BufferSync()
-{
-	int			i;
-	BufferDesc *bufHdr;
-	Buffer		buffer;
-	int			status;
-	RelFileNode rnode;
-	XLogRecPtr	recptr;
-	Relation	reln = NULL;
-
-	for (i = 0, bufHdr = BufferDescriptors; i < NBuffers; i++, bufHdr++)
-	{
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-		if (!(bufHdr->flags & BM_VALID))
-		{
-			LWLockRelease(BufMgrLock);
-			continue;
-		}
-
-		/*
-		 * We can check bufHdr->cntxDirty here *without* holding any lock
-		 * on buffer context as long as we set this flag in access methods
-		 * *before* logging changes with XLogInsert(): if someone will set
-		 * cntxDirty just after our check we don't worry because of our
-		 * checkpoint.redo points before log record for upcoming changes
-		 * and so we are not required to write such dirty buffer.
-		 */
-		if (!(bufHdr->flags & BM_DIRTY) && !(bufHdr->cntxDirty))
-		{
-			LWLockRelease(BufMgrLock);
-			continue;
-		}
-
-		/*
-		 * IO synchronization. Note that we do it with unpinned buffer to
-		 * avoid conflicts with FlushRelationBuffers.
-		 */
-		if (bufHdr->flags & BM_IO_IN_PROGRESS)
-		{
-			WaitIO(bufHdr);
-			if (!(bufHdr->flags & BM_VALID) ||
-				(!(bufHdr->flags & BM_DIRTY) && !(bufHdr->cntxDirty)))
-			{
-				LWLockRelease(BufMgrLock);
-				continue;
-			}
-		}
-
-		/*
-		 * Here: no one doing IO for this buffer and it's dirty. Pin
-		 * buffer now and set IO state for it *before* acquiring shlock to
-		 * avoid conflicts with FlushRelationBuffers.
-		 */
-		PinBuffer(bufHdr);
-		StartBufferIO(bufHdr, false);	/* output IO start */
-
-		buffer = BufferDescriptorGetBuffer(bufHdr);
-		rnode = bufHdr->tag.rnode;
-
-		LWLockRelease(BufMgrLock);
-
-		/*
-		 * Try to find relation for buffer
-		 */
-		reln = RelationNodeCacheGetRelation(rnode);
-
-		/*
-		 * Protect buffer content against concurrent update
-		 */
-		LockBuffer(buffer, BUFFER_LOCK_SHARE);
-
-		/*
-		 * Force XLOG flush for buffer' LSN
-		 */
-		recptr = BufferGetLSN(bufHdr);
-		XLogFlush(recptr);
-
-		/*
-		 * Now it's safe to write buffer to disk. Note that no one else
-		 * should not be able to write it while we were busy with locking
-		 * and log flushing because of we setted IO flag.
-		 */
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		Assert(bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty);
-		bufHdr->flags &= ~BM_JUST_DIRTIED;
-		LWLockRelease(BufMgrLock);
-
-		if (reln == (Relation) NULL)
-		{
-			status = smgrblindwrt(DEFAULT_SMGR,
-								  bufHdr->tag.rnode,
-								  bufHdr->tag.blockNum,
-								  (char *) MAKE_PTR(bufHdr->data),
-								  true);		/* must fsync */
-		}
-		else
-		{
-			status = smgrwrite(DEFAULT_SMGR, reln,
-							   bufHdr->tag.blockNum,
-							   (char *) MAKE_PTR(bufHdr->data));
-		}
-
-		if (status == SM_FAIL)	/* disk failure ?! */
-			elog(PANIC, "BufferSync: cannot write %u for %u/%u",
-				 bufHdr->tag.blockNum,
-				 bufHdr->tag.rnode.tblNode, bufHdr->tag.rnode.relNode);
-
-		/*
-		 * Note that it's safe to change cntxDirty here because of we
-		 * protect it from upper writers by share lock and from other
-		 * bufmgr routines by BM_IO_IN_PROGRESS
-		 */
-		bufHdr->cntxDirty = false;
-
-		/*
-		 * Release the per-buffer readlock, reacquire BufMgrLock.
-		 */
-		LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
-		BufferFlushCount++;
-
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-		bufHdr->flags &= ~BM_IO_IN_PROGRESS;	/* mark IO finished */
-		TerminateBufferIO(bufHdr);		/* Sync IO finished */
-
-		/*
-		 * If this buffer was marked by someone as DIRTY while we were
-		 * flushing it out we must not clear DIRTY flag - vadim 01/17/97
-		 */
-		if (!(bufHdr->flags & BM_JUST_DIRTIED))
-			bufHdr->flags &= ~BM_DIRTY;
-		UnpinBuffer(bufHdr);
-		LWLockRelease(BufMgrLock);
-
-		/* drop refcnt obtained by RelationNodeCacheGetRelation */
-		if (reln != (Relation) NULL)
-			RelationDecrementReferenceCount(reln);
-	}
-
-}
-
-/*
- * WaitIO -- Block until the IO_IN_PROGRESS flag on 'buf' is cleared.
- *
- * Should be entered with buffer manager lock held; releases it before
- * waiting and re-acquires it afterwards.
- */
-static void
-WaitIO(BufferDesc *buf)
-{
-	/*
-	 * Changed to wait until there's no IO - Inoue 01/13/2000
-	 *
-	 * Note this is *necessary* because an error abort in the process doing
-	 * I/O could release the io_in_progress_lock prematurely. See
-	 * AbortBufferIO.
-	 */
-	while ((buf->flags & BM_IO_IN_PROGRESS) != 0)
-	{
-		LWLockRelease(BufMgrLock);
-		LWLockAcquire(buf->io_in_progress_lock, LW_SHARED);
-		LWLockRelease(buf->io_in_progress_lock);
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-	}
-}
-
-
-long		NDirectFileRead;	/* some I/O's are direct file access.
-								 * bypass bufmgr */
-long		NDirectFileWrite;	/* e.g., I/O in psort and hashjoin. */
-
-
-/*
- * Return a palloc'd string containing buffer usage statistics.
- */
-char *
-ShowBufferUsage(void)
-{
-	StringInfoData str;
-	float		hitrate;
-	float		localhitrate;
-
-	initStringInfo(&str);
-
-	if (ReadBufferCount == 0)
-		hitrate = 0.0;
-	else
-		hitrate = (float) BufferHitCount *100.0 / ReadBufferCount;
-
-	if (ReadLocalBufferCount == 0)
-		localhitrate = 0.0;
-	else
-		localhitrate = (float) LocalBufferHitCount *100.0 / ReadLocalBufferCount;
-
-	appendStringInfo(&str,
-			"!\tShared blocks: %10ld read, %10ld written, buffer hit rate = %.2f%%\n",
-			ReadBufferCount - BufferHitCount, BufferFlushCount, hitrate);
-	appendStringInfo(&str,
-			"!\tLocal  blocks: %10ld read, %10ld written, buffer hit rate = %.2f%%\n",
-			ReadLocalBufferCount - LocalBufferHitCount, LocalBufferFlushCount, localhitrate);
-	appendStringInfo(&str,
-			"!\tDirect blocks: %10ld read, %10ld written\n",
-			NDirectFileRead, NDirectFileWrite);
-
-	return str.data;
-}
-
-void
-ResetBufferUsage(void)
-{
-	BufferHitCount = 0;
-	ReadBufferCount = 0;
-	BufferFlushCount = 0;
-	LocalBufferHitCount = 0;
-	ReadLocalBufferCount = 0;
-	LocalBufferFlushCount = 0;
-	NDirectFileRead = 0;
-	NDirectFileWrite = 0;
-}
-
-/* ----------------------------------------------
- *		ResetBufferPool
- *
- *		This routine is supposed to be called when a transaction aborts.
- *		It will release all the buffer pins held by the transaction.
- *		Currently, we also call it during commit if BufferPoolCheckLeak
- *		detected a problem --- in that case, isCommit is TRUE, and we
- *		only clean up buffer pin counts.
- *
- * ----------------------------------------------
- */
-void
-ResetBufferPool(bool isCommit)
-{
-	int			i;
-
-	for (i = 0; i < NBuffers; i++)
-	{
-		if (PrivateRefCount[i] != 0)
-		{
-			BufferDesc *buf = &BufferDescriptors[i];
-
-			PrivateRefCount[i] = 1;		/* make sure we release shared pin */
-			LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-			UnpinBuffer(buf);
-			LWLockRelease(BufMgrLock);
-			Assert(PrivateRefCount[i] == 0);
-		}
-	}
-
-	ResetLocalBufferPool();
-
-	if (!isCommit)
-		smgrabort();
-}
-
-/*
- * BufferPoolCheckLeak
- *
- *		check if there is buffer leak
- */
-bool
-BufferPoolCheckLeak(void)
-{
-	int			i;
-	bool		result = false;
-
-	for (i = 0; i < NBuffers; i++)
-	{
-		if (PrivateRefCount[i] != 0)
-		{
-			BufferDesc *buf = &(BufferDescriptors[i]);
-
-			elog(WARNING,
-				 "Buffer Leak: [%03d] (freeNext=%d, freePrev=%d, \
-rel=%u/%u, blockNum=%u, flags=0x%x, refcount=%d %ld)",
-				 i, buf->freeNext, buf->freePrev,
-				 buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				 buf->tag.blockNum, buf->flags,
-				 buf->refcount, PrivateRefCount[i]);
-			result = true;
-		}
-	}
-	return result;
-}
-
-/* ------------------------------------------------
- * FlushBufferPool
- *
- * Flush all dirty blocks in buffer pool to disk
- * at the checkpoint time
- * ------------------------------------------------
- */
-void
-FlushBufferPool(void)
-{
-	BufferSync();
-	smgrsync();
-}
-
-/*
- * At the commit time we have to flush local buffer pool only
- */
-void
-BufmgrCommit(void)
-{
-	LocalBufferSync();
-
-	/*
-	 * All files created in current transaction will be fsync-ed
-	 */
-	smgrcommit();
-}
-
-/*
- * BufferGetBlockNumber
- *		Returns the block number associated with a buffer.
- *
- * Note:
- *		Assumes that the buffer is valid and pinned, else the
- *		value may be obsolete immediately...
- */
-BlockNumber
-BufferGetBlockNumber(Buffer buffer)
-{
-	Assert(BufferIsPinned(buffer));
-
-	if (BufferIsLocal(buffer))
-		return LocalBufferDescriptors[-buffer - 1].tag.blockNum;
-	else
-		return BufferDescriptors[buffer - 1].tag.blockNum;
-}
-
-/*
- * BufferReplace
- *
- * Write out the buffer corresponding to 'bufHdr'
- *
- * BufMgrLock must be held at entry, and the buffer must be pinned.
- */
-static int
-BufferReplace(BufferDesc *bufHdr)
-{
-	Relation	reln;
-	XLogRecPtr	recptr;
-	int			status;
-
-	/* To check if block content changed while flushing. - vadim 01/17/97 */
-	bufHdr->flags &= ~BM_JUST_DIRTIED;
-
-	LWLockRelease(BufMgrLock);
-
-	/*
-	 * No need to lock buffer context - no one should be able to end
-	 * ReadBuffer
-	 */
-	recptr = BufferGetLSN(bufHdr);
-	XLogFlush(recptr);
-
-	reln = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
-
-	if (reln != (Relation) NULL)
-	{
-		status = smgrwrite(DEFAULT_SMGR, reln, bufHdr->tag.blockNum,
-						   (char *) MAKE_PTR(bufHdr->data));
-	}
-	else
-	{
-		status = smgrblindwrt(DEFAULT_SMGR, bufHdr->tag.rnode,
-							  bufHdr->tag.blockNum,
-							  (char *) MAKE_PTR(bufHdr->data),
-							  false);	/* no fsync */
-	}
-
-	/* drop relcache refcnt incremented by RelationNodeCacheGetRelation */
-	if (reln != (Relation) NULL)
-		RelationDecrementReferenceCount(reln);
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	if (status == SM_FAIL)
-		return FALSE;
-
-	BufferFlushCount++;
-
-	return TRUE;
-}
-
-/*
- * RelationGetNumberOfBlocks
- *		Determines the current number of pages in the relation.
- *		Side effect: relation->rd_nblocks is updated.
- *
- * Note:
- *		XXX may fail for huge relations.
- *		XXX should be elsewhere.
- *		XXX maybe should be hidden
- */
-BlockNumber
-RelationGetNumberOfBlocks(Relation relation)
-{
-	/*
-	 * relation->rd_nblocks should be accurate already if the relation is
-	 * myxactonly.	(XXX how safe is that really?)	Don't call smgr on a
-	 * view, either.
-	 */
-	if (relation->rd_rel->relkind == RELKIND_VIEW)
-		relation->rd_nblocks = 0;
-	else if (!relation->rd_myxactonly)
-		relation->rd_nblocks = smgrnblocks(DEFAULT_SMGR, relation);
-	return relation->rd_nblocks;
-}
-
-/* ---------------------------------------------------------------------
- *		DropRelationBuffers
- *
- *		This function removes all the buffered pages for a relation
- *		from the buffer pool.  Dirty pages are simply dropped, without
- *		bothering to write them out first.	This is NOT rollback-able,
- *		and so should be used only with extreme caution!
- *
- *		We assume that the caller holds an exclusive lock on the relation,
- *		which should assure that no new buffers will be acquired for the rel
- *		meanwhile.
- *
- *		XXX currently it sequentially searches the buffer pool, should be
- *		changed to more clever ways of searching.
- * --------------------------------------------------------------------
- */
-void
-DropRelationBuffers(Relation rel)
-{
-	int			i;
-	BufferDesc *bufHdr;
-
-	if (rel->rd_myxactonly)
-	{
-		for (i = 0; i < NLocBuffer; i++)
-		{
-			bufHdr = &LocalBufferDescriptors[i];
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
-			{
-				bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-				bufHdr->cntxDirty = false;
-				LocalRefCount[i] = 0;
-				bufHdr->tag.rnode.relNode = InvalidOid;
-			}
-		}
-		return;
-	}
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	for (i = 1; i <= NBuffers; i++)
-	{
-		bufHdr = &BufferDescriptors[i - 1];
-recheck:
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
-		{
-			/*
-			 * If there is I/O in progress, better wait till it's done;
-			 * don't want to delete the relation out from under someone
-			 * who's just trying to flush the buffer!
-			 */
-			if (bufHdr->flags & BM_IO_IN_PROGRESS)
-			{
-				WaitIO(bufHdr);
-
-				/*
-				 * By now, the buffer very possibly belongs to some other
-				 * rel, so check again before proceeding.
-				 */
-				goto recheck;
-			}
-			/* Now we can do what we came for */
-			bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-			bufHdr->cntxDirty = false;
-
-			/*
-			 * Release any refcount we may have.
-			 *
-			 * This is very probably dead code, and if it isn't then it's
-			 * probably wrong.	I added the Assert to find out --- tgl
-			 * 11/99.
-			 */
-			if (!(bufHdr->flags & BM_FREE))
-			{
-				/* Assert checks that buffer will actually get freed! */
-				Assert(PrivateRefCount[i - 1] == 1 &&
-					   bufHdr->refcount == 1);
-				ReleaseBufferWithBufferLock(i);
-			}
-
-			/*
-			 * And mark the buffer as no longer occupied by this rel.
-			 */
-			BufTableDelete(bufHdr);
-		}
-	}
-
-	LWLockRelease(BufMgrLock);
-}
-
-/* ---------------------------------------------------------------------
- *		DropRelFileNodeBuffers
- *
- *		This is the same as DropRelationBuffers, except that the target
- *		relation is specified by RelFileNode.
- *
- *		This is NOT rollback-able.	One legitimate use is to clear the
- *		buffer cache of buffers for a relation that is being deleted
- *		during transaction abort.
- * --------------------------------------------------------------------
- */
-void
-DropRelFileNodeBuffers(RelFileNode rnode)
-{
-	int			i;
-	BufferDesc *bufHdr;
-
-	/* We have to search both local and shared buffers... */
-
-	for (i = 0; i < NLocBuffer; i++)
-	{
-		bufHdr = &LocalBufferDescriptors[i];
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode))
-		{
-			bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-			bufHdr->cntxDirty = false;
-			LocalRefCount[i] = 0;
-			bufHdr->tag.rnode.relNode = InvalidOid;
-		}
-	}
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	for (i = 1; i <= NBuffers; i++)
-	{
-		bufHdr = &BufferDescriptors[i - 1];
-recheck:
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode))
-		{
-			/*
-			 * If there is I/O in progress, better wait till it's done;
-			 * don't want to delete the relation out from under someone
-			 * who's just trying to flush the buffer!
-			 */
-			if (bufHdr->flags & BM_IO_IN_PROGRESS)
-			{
-				WaitIO(bufHdr);
-
-				/*
-				 * By now, the buffer very possibly belongs to some other
-				 * rel, so check again before proceeding.
-				 */
-				goto recheck;
-			}
-			/* Now we can do what we came for */
-			bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-			bufHdr->cntxDirty = false;
-
-			/*
-			 * Release any refcount we may have.
-			 *
-			 * This is very probably dead code, and if it isn't then it's
-			 * probably wrong.	I added the Assert to find out --- tgl
-			 * 11/99.
-			 */
-			if (!(bufHdr->flags & BM_FREE))
-			{
-				/* Assert checks that buffer will actually get freed! */
-				Assert(PrivateRefCount[i - 1] == 1 &&
-					   bufHdr->refcount == 1);
-				ReleaseBufferWithBufferLock(i);
-			}
-
-			/*
-			 * And mark the buffer as no longer occupied by this rel.
-			 */
-			BufTableDelete(bufHdr);
-		}
-	}
-
-	LWLockRelease(BufMgrLock);
-}
-
-/* ---------------------------------------------------------------------
- *		DropBuffers
- *
- *		This function removes all the buffers in the buffer cache for a
- *		particular database.  Dirty pages are simply dropped, without
- *		bothering to write them out first.	This is used when we destroy a
- *		database, to avoid trying to flush data to disk when the directory
- *		tree no longer exists.	Implementation is pretty similar to
- *		DropRelationBuffers() which is for destroying just one relation.
- * --------------------------------------------------------------------
- */
-void
-DropBuffers(Oid dbid)
-{
-	int			i;
-	BufferDesc *bufHdr;
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	for (i = 1; i <= NBuffers; i++)
-	{
-		bufHdr = &BufferDescriptors[i - 1];
-recheck:
-
-		/*
-		 * We know that currently database OID is tblNode but this
-		 * probably will be changed in future and this func will be used
-		 * to drop tablespace buffers.
-		 */
-		if (bufHdr->tag.rnode.tblNode == dbid)
-		{
-			/*
-			 * If there is I/O in progress, better wait till it's done;
-			 * don't want to delete the database out from under someone
-			 * who's just trying to flush the buffer!
-			 */
-			if (bufHdr->flags & BM_IO_IN_PROGRESS)
-			{
-				WaitIO(bufHdr);
-
-				/*
-				 * By now, the buffer very possibly belongs to some other
-				 * DB, so check again before proceeding.
-				 */
-				goto recheck;
-			}
-			/* Now we can do what we came for */
-			bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-			bufHdr->cntxDirty = false;
-
-			/*
-			 * The thing should be free, if caller has checked that no
-			 * backends are running in that database.
-			 */
-			Assert(bufHdr->flags & BM_FREE);
-
-			/*
-			 * And mark the buffer as no longer occupied by this page.
-			 */
-			BufTableDelete(bufHdr);
-		}
-	}
-
-	LWLockRelease(BufMgrLock);
-}
-
-/* -----------------------------------------------------------------
- *		PrintBufferDescs
- *
- *		this function prints all the buffer descriptors, for debugging
- *		use only.
- * -----------------------------------------------------------------
- */
-void
-PrintBufferDescs()
-{
-	int			i;
-	BufferDesc *buf = BufferDescriptors;
-
-	if (IsUnderPostmaster)
-	{
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		for (i = 0; i < NBuffers; ++i, ++buf)
-		{
-			elog(LOG, "[%02d] (freeNext=%d, freePrev=%d, rel=%u/%u, \
-blockNum=%u, flags=0x%x, refcount=%d %ld)",
-				 i, buf->freeNext, buf->freePrev,
-				 buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				 buf->tag.blockNum, buf->flags,
-				 buf->refcount, PrivateRefCount[i]);
-		}
-		LWLockRelease(BufMgrLock);
-	}
-	else
-	{
-		/* interactive backend */
-		for (i = 0; i < NBuffers; ++i, ++buf)
-		{
-			printf("[%-2d] (%u/%u, %u) flags=0x%x, refcnt=%d %ld)\n",
-				   i, buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				   buf->tag.blockNum,
-				   buf->flags, buf->refcount, PrivateRefCount[i]);
-		}
-	}
-}
-
-void
-PrintPinnedBufs()
-{
-	int			i;
-	BufferDesc *buf = BufferDescriptors;
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-	for (i = 0; i < NBuffers; ++i, ++buf)
-	{
-		if (PrivateRefCount[i] > 0)
-			elog(WARNING, "[%02d] (freeNext=%d, freePrev=%d, rel=%u/%u, \
-blockNum=%u, flags=0x%x, refcount=%d %ld)",
-				 i, buf->freeNext, buf->freePrev,
-				 buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				 buf->tag.blockNum, buf->flags,
-				 buf->refcount, PrivateRefCount[i]);
-	}
-	LWLockRelease(BufMgrLock);
-}
-
-/*
- * BufferPoolBlowaway
- *
- * this routine is solely for the purpose of experiments -- sometimes
- * you may want to blowaway whatever is left from the past in buffer
- * pool and start measuring some performance with a clean empty buffer
- * pool.
- */
-#ifdef NOT_USED
-void
-BufferPoolBlowaway()
-{
-	int			i;
-
-	BufferSync();
-	for (i = 1; i <= NBuffers; i++)
-	{
-		if (BufferIsValid(i))
-		{
-			while (BufferIsValid(i))
-				ReleaseBuffer(i);
-		}
-		BufTableDelete(&BufferDescriptors[i - 1]);
-	}
-}
-#endif
-
-/* ---------------------------------------------------------------------
- *		FlushRelationBuffers
- *
- *		This function writes all dirty pages of a relation out to disk.
- *		Furthermore, pages that have blocknumber >= firstDelBlock are
- *		actually removed from the buffer pool.	An error code is returned
- *		if we fail to dump a dirty buffer or if we find one of
- *		the target pages is pinned into the cache.
- *
- *		This is called by DROP TABLE to clear buffers for the relation
- *		from the buffer pool.  Note that we must write dirty buffers,
- *		rather than just dropping the changes, because our transaction
- *		might abort later on; we want to roll back safely in that case.
- *
- *		This is also called by VACUUM before truncating the relation to the
- *		given number of blocks.  It might seem unnecessary for VACUUM to
- *		write dirty pages before firstDelBlock, since VACUUM should already
- *		have committed its changes.  However, it is possible for there still
- *		to be dirty pages: if some page had unwritten on-row tuple status
- *		updates from a prior transaction, and VACUUM had no additional
- *		changes to make to that page, then VACUUM won't have written it.
- *		This is harmless in most cases but will break pg_upgrade, which
- *		relies on VACUUM to ensure that *all* tuples have correct on-row
- *		status.  So, we check and flush all dirty pages of the rel
- *		regardless of block number.
- *
- *		In all cases, the caller should be holding AccessExclusiveLock on
- *		the target relation to ensure that no other backend is busy reading
- *		more blocks of the relation (or might do so before we commit).
- *
- *		Formerly, we considered it an error condition if we found dirty
- *		buffers here.	However, since BufferSync no longer forces out all
- *		dirty buffers at every xact commit, it's possible for dirty buffers
- *		to still be present in the cache due to failure of an earlier
- *		transaction.  So, must flush dirty buffers without complaint.
- *
- *		Returns: 0 - Ok, -1 - FAILED TO WRITE DIRTY BUFFER, -2 - PINNED
- *
- *		XXX currently it sequentially searches the buffer pool, should be
- *		changed to more clever ways of searching.
- * --------------------------------------------------------------------
- */
-int
-FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
-{
-	int			i;
-	BufferDesc *bufHdr;
-	XLogRecPtr	recptr;
-	int			status;
-
-	if (rel->rd_myxactonly)
-	{
-		for (i = 0; i < NLocBuffer; i++)
-		{
-			bufHdr = &LocalBufferDescriptors[i];
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
-			{
-				if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
-				{
-					status = smgrwrite(DEFAULT_SMGR, rel,
-									   bufHdr->tag.blockNum,
-									   (char *) MAKE_PTR(bufHdr->data));
-					if (status == SM_FAIL)
-					{
-						elog(WARNING, "FlushRelationBuffers(%s (local), %u): block %u is dirty, could not flush it",
-							 RelationGetRelationName(rel), firstDelBlock,
-							 bufHdr->tag.blockNum);
-						return (-1);
-					}
-					bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
-					bufHdr->cntxDirty = false;
-				}
-				if (LocalRefCount[i] > 0)
-				{
-					elog(WARNING, "FlushRelationBuffers(%s (local), %u): block %u is referenced (%ld)",
-						 RelationGetRelationName(rel), firstDelBlock,
-						 bufHdr->tag.blockNum, LocalRefCount[i]);
-					return (-2);
-				}
-				if (bufHdr->tag.blockNum >= firstDelBlock)
-					bufHdr->tag.rnode.relNode = InvalidOid;
-			}
-		}
-		return 0;
-	}
-
-	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-	for (i = 0; i < NBuffers; i++)
-	{
-		bufHdr = &BufferDescriptors[i];
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
-		{
-			if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
-			{
-				PinBuffer(bufHdr);
-				if (bufHdr->flags & BM_IO_IN_PROGRESS)
-					WaitIO(bufHdr);
-				LWLockRelease(BufMgrLock);
-
-				/*
-				 * Force XLOG flush for buffer' LSN
-				 */
-				recptr = BufferGetLSN(bufHdr);
-				XLogFlush(recptr);
-
-				/*
-				 * Now it's safe to write buffer to disk
-				 */
-
-				LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-				if (bufHdr->flags & BM_IO_IN_PROGRESS)
-					WaitIO(bufHdr);
-
-				if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
-				{
-					bufHdr->flags &= ~BM_JUST_DIRTIED;
-					StartBufferIO(bufHdr, false);		/* output IO start */
-
-					LWLockRelease(BufMgrLock);
-
-					status = smgrwrite(DEFAULT_SMGR, rel,
-									   bufHdr->tag.blockNum,
-									   (char *) MAKE_PTR(bufHdr->data));
-
-					if (status == SM_FAIL)		/* disk failure ?! */
-						elog(PANIC, "FlushRelationBuffers: cannot write %u for %u/%u",
-							 bufHdr->tag.blockNum,
-							 bufHdr->tag.rnode.tblNode,
-							 bufHdr->tag.rnode.relNode);
-
-					BufferFlushCount++;
-
-					LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-					bufHdr->flags &= ~BM_IO_IN_PROGRESS;
-					TerminateBufferIO(bufHdr);
-					Assert(!(bufHdr->flags & BM_JUST_DIRTIED));
-					bufHdr->flags &= ~BM_DIRTY;
-
-					/*
-					 * Note that it's safe to change cntxDirty here
-					 * because of we protect it from upper writers by
-					 * AccessExclusiveLock and from other bufmgr routines
-					 * by BM_IO_IN_PROGRESS
-					 */
-					bufHdr->cntxDirty = false;
-				}
-				UnpinBuffer(bufHdr);
-			}
-			if (!(bufHdr->flags & BM_FREE))
-			{
-				LWLockRelease(BufMgrLock);
-				elog(WARNING, "FlushRelationBuffers(%s, %u): block %u is referenced (private %ld, global %d)",
-					 RelationGetRelationName(rel), firstDelBlock,
-					 bufHdr->tag.blockNum,
-					 PrivateRefCount[i], bufHdr->refcount);
-				return -2;
-			}
-			if (bufHdr->tag.blockNum >= firstDelBlock)
-				BufTableDelete(bufHdr);
-		}
-	}
-	LWLockRelease(BufMgrLock);
-	return 0;
-}
-
-#undef ReleaseBuffer
-
-/*
- * ReleaseBuffer -- remove the pin on a buffer without
- *		marking it dirty.
- */
-int
-ReleaseBuffer(Buffer buffer)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsLocal(buffer))
-	{
-		Assert(LocalRefCount[-buffer - 1] > 0);
-		LocalRefCount[-buffer - 1]--;
-		return STATUS_OK;
-	}
-
-	if (BAD_BUFFER_ID(buffer))
-		return STATUS_ERROR;
-
-	bufHdr = &BufferDescriptors[buffer - 1];
-
-	Assert(PrivateRefCount[buffer - 1] > 0);
-	if (PrivateRefCount[buffer - 1] > 1)
-		PrivateRefCount[buffer - 1]--;
-	else
-	{
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		UnpinBuffer(bufHdr);
-		LWLockRelease(BufMgrLock);
-	}
-
-	return STATUS_OK;
-}
-
-/*
- * ReleaseBufferWithBufferLock
- *		Same as ReleaseBuffer except we hold the bufmgr lock
- */
-static int
-ReleaseBufferWithBufferLock(Buffer buffer)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsLocal(buffer))
-	{
-		Assert(LocalRefCount[-buffer - 1] > 0);
-		LocalRefCount[-buffer - 1]--;
-		return STATUS_OK;
-	}
-
-	if (BAD_BUFFER_ID(buffer))
-		return STATUS_ERROR;
-
-	bufHdr = &BufferDescriptors[buffer - 1];
-
-	Assert(PrivateRefCount[buffer - 1] > 0);
-	if (PrivateRefCount[buffer - 1] > 1)
-		PrivateRefCount[buffer - 1]--;
-	else
-		UnpinBuffer(bufHdr);
-
-	return STATUS_OK;
-}
-
-
-#ifdef NOT_USED
-void
-IncrBufferRefCount_Debug(char *file, int line, Buffer buffer)
-{
-	IncrBufferRefCount(buffer);
-	if (ShowPinTrace && !BufferIsLocal(buffer) && is_userbuffer(buffer))
-	{
-		BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
-		fprintf(stderr, "PIN(Incr) %d rel = %u/%u, blockNum = %u, \
-refcount = %ld, file: %s, line: %d\n",
-				buffer,
-				buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				buf->tag.blockNum,
-				PrivateRefCount[buffer - 1], file, line);
-	}
-}
-#endif
-
-#ifdef NOT_USED
-void
-ReleaseBuffer_Debug(char *file, int line, Buffer buffer)
-{
-	ReleaseBuffer(buffer);
-	if (ShowPinTrace && !BufferIsLocal(buffer) && is_userbuffer(buffer))
-	{
-		BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
-		fprintf(stderr, "UNPIN(Rel) %d rel = %u/%u, blockNum = %u, \
-refcount = %ld, file: %s, line: %d\n",
-				buffer,
-				buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				buf->tag.blockNum,
-				PrivateRefCount[buffer - 1], file, line);
-	}
-}
-#endif
-
-#ifdef NOT_USED
-int
-ReleaseAndReadBuffer_Debug(char *file,
-						   int line,
-						   Buffer buffer,
-						   Relation relation,
-						   BlockNumber blockNum)
-{
-	bool		bufferValid;
-	Buffer		b;
-
-	bufferValid = BufferIsValid(buffer);
-	b = ReleaseAndReadBuffer(buffer, relation, blockNum);
-	if (ShowPinTrace && bufferValid && BufferIsLocal(buffer)
-		&& is_userbuffer(buffer))
-	{
-		BufferDesc *buf = &BufferDescriptors[buffer - 1];
-
-		fprintf(stderr, "UNPIN(Rel&Rd) %d rel = %u/%u, blockNum = %u, \
-refcount = %ld, file: %s, line: %d\n",
-				buffer,
-				buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				buf->tag.blockNum,
-				PrivateRefCount[buffer - 1], file, line);
-	}
-	if (ShowPinTrace && BufferIsLocal(buffer) && is_userbuffer(buffer))
-	{
-		BufferDesc *buf = &BufferDescriptors[b - 1];
-
-		fprintf(stderr, "PIN(Rel&Rd) %d rel = %u/%u, blockNum = %u, \
-refcount = %ld, file: %s, line: %d\n",
-				b,
-				buf->tag.rnode.tblNode, buf->tag.rnode.relNode,
-				buf->tag.blockNum,
-				PrivateRefCount[b - 1], file, line);
-	}
-	return b;
-}
-#endif
-
-#ifdef BMTRACE
-
-/*
- *	trace allocations and deallocations in a circular buffer in
- *	shared memory.	check the buffer before doing the allocation,
- *	and die if there's anything fishy.
- */
-
-void
-_bm_trace(Oid dbId, Oid relId, int blkNo, int bufNo, int allocType)
-{
-	long		start,
-				cur;
-	bmtrace    *tb;
-
-	start = *CurTraceBuf;
-
-	if (start > 0)
-		cur = start - 1;
-	else
-		cur = BMT_LIMIT - 1;
-
-	for (;;)
-	{
-		tb = &TraceBuf[cur];
-		if (tb->bmt_op != BMT_NOTUSED)
-		{
-			if (tb->bmt_buf == bufNo)
-			{
-				if ((tb->bmt_op == BMT_DEALLOC)
-					|| (tb->bmt_dbid == dbId && tb->bmt_relid == relId
-						&& tb->bmt_blkno == blkNo))
-					goto okay;
-
-				/* die holding the buffer lock */
-				_bm_die(dbId, relId, blkNo, bufNo, allocType, start, cur);
-			}
-		}
-
-		if (cur == start)
-			goto okay;
-
-		if (cur == 0)
-			cur = BMT_LIMIT - 1;
-		else
-			cur--;
-	}
-
-okay:
-	tb = &TraceBuf[start];
-	tb->bmt_pid = MyProcPid;
-	tb->bmt_buf = bufNo;
-	tb->bmt_dbid = dbId;
-	tb->bmt_relid = relId;
-	tb->bmt_blkno = blkNo;
-	tb->bmt_op = allocType;
-
-	*CurTraceBuf = (start + 1) % BMT_LIMIT;
-}
-
-void
-_bm_die(Oid dbId, Oid relId, int blkNo, int bufNo,
-		int allocType, long start, long cur)
-{
-	FILE	   *fp;
-	bmtrace    *tb;
-	int			i;
-
-	tb = &TraceBuf[cur];
-
-	if ((fp = AllocateFile("/tmp/death_notice", "w")) == NULL)
-		elog(FATAL, "buffer alloc trace error and can't open log file");
-
-	fprintf(fp, "buffer alloc trace detected the following error:\n\n");
-	fprintf(fp, "    buffer %d being %s inconsistently with a previous %s\n\n",
-		 bufNo, (allocType == BMT_DEALLOC ? "deallocated" : "allocated"),
-			(tb->bmt_op == BMT_DEALLOC ? "deallocation" : "allocation"));
-
-	fprintf(fp, "the trace buffer contains:\n");
-
-	i = start;
-	for (;;)
-	{
-		tb = &TraceBuf[i];
-		if (tb->bmt_op != BMT_NOTUSED)
-		{
-			fprintf(fp, "     [%3d]%spid %d buf %2d for <%u,%u,%u> ",
-					i, (i == cur ? " ---> " : "\t"),
-					tb->bmt_pid, tb->bmt_buf,
-					tb->bmt_dbid, tb->bmt_relid, tb->bmt_blkno);
-
-			switch (tb->bmt_op)
-			{
-				case BMT_ALLOCFND:
-					fprintf(fp, "allocate (found)\n");
-					break;
-
-				case BMT_ALLOCNOTFND:
-					fprintf(fp, "allocate (not found)\n");
-					break;
-
-				case BMT_DEALLOC:
-					fprintf(fp, "deallocate\n");
-					break;
-
-				default:
-					fprintf(fp, "unknown op type %d\n", tb->bmt_op);
-					break;
-			}
-		}
-
-		i = (i + 1) % BMT_LIMIT;
-		if (i == start)
-			break;
-	}
-
-	fprintf(fp, "\noperation causing error:\n");
-	fprintf(fp, "\tpid %d buf %d for <%d,%u,%d> ",
-			getpid(), bufNo, dbId, relId, blkNo);
-
-	switch (allocType)
-	{
-		case BMT_ALLOCFND:
-			fprintf(fp, "allocate (found)\n");
-			break;
-
-		case BMT_ALLOCNOTFND:
-			fprintf(fp, "allocate (not found)\n");
-			break;
-
-		case BMT_DEALLOC:
-			fprintf(fp, "deallocate\n");
-			break;
-
-		default:
-			fprintf(fp, "unknown op type %d\n", allocType);
-			break;
-	}
-
-	FreeFile(fp);
-
-	kill(getpid(), SIGILL);
-}
-#endif   /* BMTRACE */
-
-/*
- * SetBufferCommitInfoNeedsSave
- *
- *	Mark a buffer dirty when we have updated tuple commit-status bits in it.
- *
- * This is similar to WriteNoReleaseBuffer, except that we have not made a
- * critical change that has to be flushed to disk before xact commit --- the
- * status-bit update could be redone by someone else just as easily.
- *
- * This routine might get called many times on the same page, if we are making
- * the first scan after commit of an xact that added/deleted many tuples.
- * So, be as quick as we can if the buffer is already dirty.
- */
-void
-SetBufferCommitInfoNeedsSave(Buffer buffer)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsLocal(buffer))
-		return;
-
-	if (BAD_BUFFER_ID(buffer))
-		return;
-
-	bufHdr = &BufferDescriptors[buffer - 1];
-
-	if ((bufHdr->flags & (BM_DIRTY | BM_JUST_DIRTIED)) !=
-		(BM_DIRTY | BM_JUST_DIRTIED))
-	{
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		Assert(bufHdr->refcount > 0);
-		bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
-		LWLockRelease(BufMgrLock);
-	}
-}
-
-/*
- * Release buffer context locks for shared buffers.
- *
- * Used to clean up after errors.
- */
-void
-UnlockBuffers(void)
-{
-	BufferDesc *buf;
-	int			i;
-
-	for (i = 0; i < NBuffers; i++)
-	{
-		bits8		buflocks = BufferLocks[i];
-
-		if (buflocks == 0)
-			continue;
-
-		Assert(BufferIsValid(i + 1));
-		buf = &(BufferDescriptors[i]);
-
-		HOLD_INTERRUPTS();		/* don't want to die() partway through... */
-
-		/*
-		 * The buffer's cntx_lock has already been released by lwlock.c.
-		 */
-
-		if (buflocks & BL_PIN_COUNT_LOCK)
-		{
-			LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-
-			/*
-			 * Don't complain if flag bit not set; it could have been
-			 * reset but we got a cancel/die interrupt before getting the
-			 * signal.
-			 */
-			if ((buf->flags & BM_PIN_COUNT_WAITER) != 0 &&
-				buf->wait_backend_id == MyBackendId)
-				buf->flags &= ~BM_PIN_COUNT_WAITER;
-			LWLockRelease(BufMgrLock);
-			ProcCancelWaitForSignal();
-		}
-
-		BufferLocks[i] = 0;
-
-		RESUME_INTERRUPTS();
-	}
-}
-
-/*
- * Acquire or release the cntx_lock for the buffer.
- */
-void
-LockBuffer(Buffer buffer, int mode)
-{
-	BufferDesc *buf;
-
-	Assert(BufferIsValid(buffer));
-	if (BufferIsLocal(buffer))
-		return;
-
-	buf = &(BufferDescriptors[buffer - 1]);
-
-	if (mode == BUFFER_LOCK_UNLOCK)
-		LWLockRelease(buf->cntx_lock);
-	else if (mode == BUFFER_LOCK_SHARE)
-		LWLockAcquire(buf->cntx_lock, LW_SHARED);
-	else if (mode == BUFFER_LOCK_EXCLUSIVE)
-	{
-		LWLockAcquire(buf->cntx_lock, LW_EXCLUSIVE);
-
-		/*
-		 * This is not the best place to set cntxDirty flag (eg indices do
-		 * not always change buffer they lock in excl mode). But please
-		 * remember that it's critical to set cntxDirty *before* logging
-		 * changes with XLogInsert() - see comments in BufferSync().
-		 */
-		buf->cntxDirty = true;
-	}
-	else
-		elog(ERROR, "LockBuffer: unknown lock mode %d", mode);
-}
-
-/*
- * LockBufferForCleanup - lock a buffer in preparation for deleting items
- *
- * Items may be deleted from a disk page only when the caller (a) holds an
- * exclusive lock on the buffer and (b) has observed that no other backend
- * holds a pin on the buffer.  If there is a pin, then the other backend
- * might have a pointer into the buffer (for example, a heapscan reference
- * to an item --- see README for more details).  It's OK if a pin is added
- * after the cleanup starts, however; the newly-arrived backend will be
- * unable to look at the page until we release the exclusive lock.
- *
- * To implement this protocol, a would-be deleter must pin the buffer and
- * then call LockBufferForCleanup().  LockBufferForCleanup() is similar to
- * LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE), except that it loops until
- * it has successfully observed pin count = 1.
- */
-void
-LockBufferForCleanup(Buffer buffer)
-{
-	BufferDesc *bufHdr;
-	bits8	   *buflock;
-
-	Assert(BufferIsValid(buffer));
-
-	if (BufferIsLocal(buffer))
-	{
-		/* There should be exactly one pin */
-		if (LocalRefCount[-buffer - 1] != 1)
-			elog(ERROR, "LockBufferForCleanup: wrong local pin count");
-		/* Nobody else to wait for */
-		return;
-	}
-
-	/* There should be exactly one local pin */
-	if (PrivateRefCount[buffer - 1] != 1)
-		elog(ERROR, "LockBufferForCleanup: wrong local pin count");
-
-	bufHdr = &BufferDescriptors[buffer - 1];
-	buflock = &(BufferLocks[buffer - 1]);
-
-	for (;;)
-	{
-		/* Try to acquire lock */
-		LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		Assert(bufHdr->refcount > 0);
-		if (bufHdr->refcount == 1)
-		{
-			/* Successfully acquired exclusive lock with pincount 1 */
-			LWLockRelease(BufMgrLock);
-			return;
-		}
-		/* Failed, so mark myself as waiting for pincount 1 */
-		if (bufHdr->flags & BM_PIN_COUNT_WAITER)
-		{
-			LWLockRelease(BufMgrLock);
-			LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
-			elog(ERROR, "Multiple backends attempting to wait for pincount 1");
-		}
-		bufHdr->wait_backend_id = MyBackendId;
-		bufHdr->flags |= BM_PIN_COUNT_WAITER;
-		*buflock |= BL_PIN_COUNT_LOCK;
-		LWLockRelease(BufMgrLock);
-		LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
-		/* Wait to be signaled by UnpinBuffer() */
-		ProcWaitForSignal();
-		*buflock &= ~BL_PIN_COUNT_LOCK;
-		/* Loop back and try again */
-	}
-}
-
-/*
- *	Functions for IO error handling
- *
- *	Note : We assume that nested buffer IO never occur.
- *	i.e at most one io_in_progress lock is held per proc.
-*/
-static BufferDesc *InProgressBuf = (BufferDesc *) NULL;
-static bool IsForInput;
-
-/*
- * Function:StartBufferIO
- *	(Assumptions)
- *	My process is executing no IO
- *	BufMgrLock is held
- *	BM_IO_IN_PROGRESS mask is not set for the buffer
- *	The buffer is Pinned
- *
- * Because BufMgrLock is held, we are already in an interrupt holdoff here,
- * and do not need another.
- */
-static void
-StartBufferIO(BufferDesc *buf, bool forInput)
-{
-	Assert(!InProgressBuf);
-	Assert(!(buf->flags & BM_IO_IN_PROGRESS));
-	buf->flags |= BM_IO_IN_PROGRESS;
-
-	LWLockAcquire(buf->io_in_progress_lock, LW_EXCLUSIVE);
-
-	InProgressBuf = buf;
-	IsForInput = forInput;
-}
-
-/*
- * Function:TerminateBufferIO
- *	(Assumptions)
- *	My process is executing IO for the buffer
- *	BufMgrLock is held
- *	The buffer is Pinned
- *
- * Because BufMgrLock is held, we are already in an interrupt holdoff here,
- * and do not need another.
- */
-static void
-TerminateBufferIO(BufferDesc *buf)
-{
-	Assert(buf == InProgressBuf);
-	LWLockRelease(buf->io_in_progress_lock);
-	InProgressBuf = (BufferDesc *) 0;
-}
-
-/*
- * Function:ContinueBufferIO
- *	(Assumptions)
- *	My process is executing IO for the buffer
- *	BufMgrLock is held
- *	The buffer is Pinned
- *
- * Because BufMgrLock is held, we are already in an interrupt holdoff here,
- * and do not need another.
- */
-static void
-ContinueBufferIO(BufferDesc *buf, bool forInput)
-{
-	Assert(buf == InProgressBuf);
-	Assert(buf->flags & BM_IO_IN_PROGRESS);
-	IsForInput = forInput;
-}
-
-#ifdef NOT_USED
-void
-InitBufferIO(void)
-{
-	InProgressBuf = (BufferDesc *) 0;
-}
-#endif
-
-/*
- *	Clean up any active buffer I/O after an error.
- *	BufMgrLock isn't held when this function is called.
- *
- *	If I/O was in progress, we always set BM_IO_ERROR.
- */
-void
-AbortBufferIO(void)
-{
-	BufferDesc *buf = InProgressBuf;
-
-	if (buf)
-	{
-		/*
-		 * Since LWLockReleaseAll has already been called, we're not
-		 * holding the buffer's io_in_progress_lock. We have to re-acquire
-		 * it so that we can use TerminateBufferIO. Anyone who's executing
-		 * WaitIO on the buffer will be in a busy spin until we succeed in
-		 * doing this.
-		 */
-		LWLockAcquire(buf->io_in_progress_lock, LW_EXCLUSIVE);
-
-		LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
-		Assert(buf->flags & BM_IO_IN_PROGRESS);
-		if (IsForInput)
-			Assert(!(buf->flags & BM_DIRTY) && !(buf->cntxDirty));
-		else
-		{
-			Assert(buf->flags & BM_DIRTY || buf->cntxDirty);
-			/* Issue notice if this is not the first failure... */
-			if (buf->flags & BM_IO_ERROR)
-			{
-				elog(WARNING, "write error may be permanent: cannot write block %u for %u/%u",
-					 buf->tag.blockNum,
-					 buf->tag.rnode.tblNode, buf->tag.rnode.relNode);
-			}
-			buf->flags |= BM_DIRTY;
-		}
-		buf->flags |= BM_IO_ERROR;
-		buf->flags &= ~BM_IO_IN_PROGRESS;
-		TerminateBufferIO(buf);
-		LWLockRelease(BufMgrLock);
-	}
-}
-
-RelFileNode
-BufferGetFileNode(Buffer buffer)
-{
-	BufferDesc *bufHdr;
-
-	if (BufferIsLocal(buffer))
-		bufHdr = &(LocalBufferDescriptors[-buffer - 1]);
-	else
-		bufHdr = &BufferDescriptors[buffer - 1];
-
-	return (bufHdr->tag.rnode);
-}