Fix wrong WAL info value generated when gistContinueInsert() performs an

index page split.  This would result in index corruption, or even more likely
an error during WAL replay, if we were unlucky enough to crash during
end-of-recovery cleanup after having completed an incomplete GIST insertion.

Yoichi Hirai

src/backend/access/gist/gistxlog.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *			 $PostgreSQL: pgsql/src/backend/access/gist/gistxlog.c,v 1.27 2008/01/01 19:45:46 momjian Exp $
+ *			 $PostgreSQL: pgsql/src/backend/access/gist/gistxlog.c,v 1.27.2.1 2009/12/24 17:52:19 tgl Exp $
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"
@@ -649,6 +649,7 @@ gistContinueInsert(gistIncompleteInsert *insert)
 			int			j,
 						k,
 						pituplen = 0;
+			uint8		xlinfo;
 			XLogRecData *rdata;
 			XLogRecPtr	recptr;
 			Buffer		tempbuffer = InvalidBuffer;
@@ -737,6 +738,7 @@ gistContinueInsert(gistIncompleteInsert *insert)
 				for (j = 0; j < ntodelete; j++)
 					PageIndexTupleDelete(pages[0], todelete[j]);
 
+				xlinfo = XLOG_GIST_PAGE_SPLIT;
 				rdata = formSplitRdata(index->rd_node, insert->path[i],
 									   false, &(insert->key),
 									 gistMakePageLayout(buffers, numbuffer));
@@ -750,6 +752,7 @@ gistContinueInsert(gistIncompleteInsert *insert)
 					PageIndexTupleDelete(pages[0], todelete[j]);
 				gistfillbuffer(index, pages[0], itup, lenitup, InvalidOffsetNumber);
 
+				xlinfo = XLOG_GIST_PAGE_UPDATE;
 				rdata = formUpdateRdata(index->rd_node, buffers[0],
 										todelete, ntodelete,
 										itup, lenitup, &(insert->key));
@@ -766,7 +769,7 @@ gistContinueInsert(gistIncompleteInsert *insert)
 				GistPageGetOpaque(pages[j])->rightlink = InvalidBlockNumber;
 				MarkBufferDirty(buffers[j]);
 			}
-			recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
+			recptr = XLogInsert(RM_GIST_ID, xlinfo, rdata);
 			for (j = 0; j < numbuffer; j++)
 			{
 				PageSetLSN(pages[j], recptr);