4 files changed, 35 insertions, 5 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 12bf6604da1..86512e50bf8 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: buf_internals.h,v 1.39 2000/10/18 05:50:16 vadim Exp $
+ * $Id: buf_internals.h,v 1.40 2000/10/20 11:01:21 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -121,10 +121,19 @@ typedef struct sbufdesc
 	 *
 	 * Why we keep relId here? To re-use file descriptors. On rollback
 	 * WAL uses dummy relId - bad (more blind writes - open/close calls),
-	 * but allowable. Obviously we should have another cache in file manager.
+	 * but allowable. Obviously we should have another cache in file manager
+	 * - fd is not relcache deal.
 	 */
 	LockRelId	relId;
 	BufferBlindId blind;		/* was used to support blind write */
+
+	/*
+	 * When we can't delete item from page (someone else has buffer pinned)
+	 * we mark buffer for cleanup by specifying appropriate for buffer
+	 * content cleanup function. Buffer will be cleaned up from release
+	 * buffer functions.
+	 */
+	void		(*CleanupFunc)(Buffer);
 } BufferDesc;
 
 /*
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 1a06953f513..551f98e75f9 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: bufmgr.h,v 1.40 2000/08/07 20:15:50 tgl Exp $
+ * $Id: bufmgr.h,v 1.41 2000/10/20 11:01:21 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -44,6 +44,17 @@ extern int	ShowPinTrace;
 #define BUFFER_LOCK_SHARE		1
 #define BUFFER_LOCK_EXCLUSIVE	2
 
+#define UnlockAndReleaseBuffer(buffer)	\
+( \
+	LockBuffer(buffer, BUFFER_LOCK_UNLOCK), \
+	ReleaseBuffer(buffer) \
+)
+
+#define UnlockAndWriteBuffer(buffer)	\
+( \
+	LockBuffer(buffer, BUFFER_LOCK_UNLOCK), \
+	WriteBuffer(buffer) \
+)
 
 /*
  * BufferIsValid
@@ -163,4 +174,7 @@ extern void UnlockBuffers(void);
 extern void LockBuffer(Buffer buffer, int mode);
 extern void AbortBufferIO(void);
 
+extern bool BufferIsUpdatable(Buffer buffer);
+extern void MarkBufferForCleanup(Buffer buffer, void (*CleanupFunc)(Buffer));
+
 #endif
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 58ba61f68d8..85e51122f9c 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: bufpage.h,v 1.32 2000/09/07 09:58:36 vadim Exp $
+ * $Id: bufpage.h,v 1.33 2000/10/20 11:01:21 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -20,6 +20,7 @@
 #include "storage/itemid.h"
 #include "storage/off.h"
 #include "storage/page.h"
+#include "access/xlog.h"
 
 /*
  * a postgres disk page is an abstraction layered on top of a postgres
diff --git a/src/include/storage/itemid.h b/src/include/storage/itemid.h
index 0b330ce56fe..a915f701684 100644
--- a/src/include/storage/itemid.h
+++ b/src/include/storage/itemid.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: itemid.h,v 1.12 2000/09/07 09:58:36 vadim Exp $
+ * $Id: itemid.h,v 1.13 2000/10/20 11:01:21 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,6 +41,12 @@ typedef ItemIdData *ItemId;
 #endif
 
 /*
+ * This bit may be passed to PageAddItem together with
+ * LP_USED & LP_DELETED bits to specify overwrite mode
+ */
+#define	OverwritePageMode	0x10
+
+/*
  * Item offsets, lengths, and flags are represented by these types when
  * they're not actually stored in an ItemIdData.
  */