From 54af8765930fda37b0dcbf6bbf43be981bb4454c Mon Sep 17 00:00:00 2001
From: Teodor Sigaev <teodor@sigaev.ru>
Date: Thu, 31 May 2007 14:03:09 +0000
Subject: Replace ReadBuffer to ReadBufferWithStrategy in all vacuum-involved
 places to implement limited-size "ring" of buffers for VACUUM for GIN & GIST

---
 src/backend/access/gist/gistvacuum.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'src/backend/access/gist/gistvacuum.c')

diff --git a/src/backend/access/gist/gistvacuum.c b/src/backend/access/gist/gistvacuum.c
index 10d3b4fc566..1d2ca735a63 100644
--- a/src/backend/access/gist/gistvacuum.c
+++ b/src/backend/access/gist/gistvacuum.c
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.29 2007/01/05 22:19:22 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.30 2007/05/31 14:03:09 teodor Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -35,6 +35,7 @@ typedef struct
 	Relation	index;
 	MemoryContext opCtx;
 	GistBulkDeleteResult *result;
+	BufferAccessStrategy	strategy;
 } GistVacuum;
 
 typedef struct
@@ -83,7 +84,7 @@ gistDeleteSubtree(GistVacuum *gv, BlockNumber blkno)
 	Buffer		buffer;
 	Page		page;
 
-	buffer = ReadBuffer(gv->index, blkno);
+	buffer = ReadBufferWithStrategy(gv->index, blkno, gv->strategy);
 	LockBuffer(buffer, GIST_EXCLUSIVE);
 	page = (Page) BufferGetPage(buffer);
 
@@ -303,7 +304,7 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
 
 	vacuum_delay_point();
 
-	buffer = ReadBuffer(gv->index, blkno);
+	buffer = ReadBufferWithStrategy(gv->index, blkno, gv->strategy);
 	LockBuffer(buffer, GIST_EXCLUSIVE);
 	gistcheckpage(gv->index, buffer);
 	page = (Page) BufferGetPage(buffer);
@@ -550,6 +551,7 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
 		initGISTstate(&(gv.giststate), rel);
 		gv.opCtx = createTempGistContext();
 		gv.result = stats;
+		gv.strategy = info->strategy;
 
 		/* walk through the entire index for update tuples */
 		res = gistVacuumUpdate(&gv, GIST_ROOT_BLKNO, false);
@@ -600,7 +602,7 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
 
 		vacuum_delay_point();
 
-		buffer = ReadBuffer(rel, blkno);
+		buffer = ReadBufferWithStrategy(rel, blkno, info->strategy);
 		LockBuffer(buffer, GIST_SHARE);
 		page = (Page) BufferGetPage(buffer);
 
@@ -704,7 +706,7 @@ gistbulkdelete(PG_FUNCTION_ARGS)
 
 	while (stack)
 	{
-		Buffer		buffer = ReadBuffer(rel, stack->blkno);
+		Buffer		buffer = ReadBufferWithStrategy(rel, stack->blkno, info->strategy);
 		Page		page;
 		OffsetNumber i,
 					maxoff;
-- 
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