Minor code rationalization: FlushRelationBuffers just returns void,

rather than an error code, and does elog(ERROR) not elog(WARNING)
when it detects a problem.  All callers were simply elog(ERROR)'ing on
failure return anyway, and I find it hard to envision a caller that would
not, so we may as well simplify the callers and produce the more useful
error message directly.

src/backend/access/nbtree/nbtree.c

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.115 2004/05/08 19:09:24 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.116 2004/05/31 19:24:04 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -784,8 +784,6 @@ btvacuumcleanup(PG_FUNCTION_ARGS)
 		}
 		if (new_pages != num_pages)
 		{
-			int			i;
-
 			/*
 			 * Okay to truncate.
 			 *
@@ -795,9 +793,7 @@ btvacuumcleanup(PG_FUNCTION_ARGS)
 			 * blocks we aren't deleting, but it's the closest thing in
 			 * bufmgr's API.
 			 */
-			i = FlushRelationBuffers(rel, new_pages);
-			if (i < 0)
-				elog(ERROR, "FlushRelationBuffers returned %d", i);
+			FlushRelationBuffers(rel, new_pages);
 
 			/*
 			 * Do the physical truncation.

src/backend/catalog/heap.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.265 2004/05/26 04:41:07 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.266 2004/05/31 19:24:05 tgl Exp $
  *
  *
  * INTERFACE ROUTINES
@@ -1175,7 +1175,6 @@ void
 heap_drop_with_catalog(Oid rid)
 {
 	Relation	rel;
-	int			i;
 
 	/*
 	 * Open and lock the relation.
@@ -1186,9 +1185,7 @@ heap_drop_with_catalog(Oid rid)
 	 * Release all buffers that belong to this relation, after writing any
 	 * that are dirty
 	 */
-	i = FlushRelationBuffers(rel, (BlockNumber) 0);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(rel, (BlockNumber) 0);
 
 	/*
 	 * remove inheritance information

src/backend/catalog/index.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.232 2004/05/26 04:41:07 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.233 2004/05/31 19:24:05 tgl Exp $
  *
  *
  * INTERFACE ROUTINES
@@ -766,7 +766,6 @@ index_drop(Oid indexId)
 	Relation	indexRelation;
 	HeapTuple	tuple;
 	bool		hasexprs;
-	int			i;
 
 	Assert(OidIsValid(indexId));
 
@@ -826,9 +825,7 @@ index_drop(Oid indexId)
 	/*
 	 * flush buffer cache and physically remove the file
 	 */
-	i = FlushRelationBuffers(userIndexRelation, (BlockNumber) 0);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(userIndexRelation, (BlockNumber) 0);
 
 	if (userIndexRelation->rd_smgr == NULL)
 		userIndexRelation->rd_smgr = smgropen(userIndexRelation->rd_node);

src/backend/commands/cluster.c

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.124 2004/05/26 04:41:10 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.125 2004/05/31 19:24:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -660,7 +660,6 @@ swap_relfilenodes(Oid r1, Oid r2)
 	Form_pg_class relform1,
 				relform2;
 	Oid			swaptemp;
-	int			i;
 	CatalogIndexState indstate;
 
 	/* We need writable copies of both pg_class tuples. */
@@ -687,15 +686,11 @@ swap_relfilenodes(Oid r1, Oid r2)
 	 * forget about'em.  (XXX this might not be necessary anymore?)
 	 */
 	rel = relation_open(r1, NoLock);
-	i = FlushRelationBuffers(rel, 0);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(rel, 0);
 	relation_close(rel, NoLock);
 
 	rel = relation_open(r2, NoLock);
-	i = FlushRelationBuffers(rel, 0);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(rel, 0);
 	relation_close(rel, NoLock);
 
 	/*

src/backend/commands/vacuum.c

@@ -13,7 +13,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.278 2004/05/26 04:41:12 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.279 2004/05/31 19:24:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1031,9 +1031,7 @@ full_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
 			 * tuples have correct on-row commit status on disk (see
 			 * bufmgr.c's comments for FlushRelationBuffers()).
 			 */
-			i = FlushRelationBuffers(onerel, vacrelstats->rel_pages);
-			if (i < 0)
-				elog(ERROR, "FlushRelationBuffers returned %d", i);
+			FlushRelationBuffers(onerel, vacrelstats->rel_pages);
 		}
 	}
 
@@ -2542,9 +2540,7 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
 	 * tuples have correct on-row commit status on disk (see bufmgr.c's
 	 * comments for FlushRelationBuffers()).
 	 */
-	i = FlushRelationBuffers(onerel, blkno);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(onerel, blkno);
 
 	/* truncate relation, if needed */
 	if (blkno < nblocks)
@@ -2606,9 +2602,7 @@ vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
 	Assert(vacrelstats->rel_pages >= vacuum_pages->empty_end_pages);
 	relblocks = vacrelstats->rel_pages - vacuum_pages->empty_end_pages;
 
-	i = FlushRelationBuffers(onerel, relblocks);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(onerel, relblocks);
 
 	/* truncate relation if there are some empty end-pages */
 	if (vacuum_pages->empty_end_pages > 0)

src/backend/commands/vacuumlazy.c

@@ -31,7 +31,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.40 2004/05/08 19:09:25 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.41 2004/05/31 19:24:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -731,9 +731,7 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
 	 * will also write out dirty buffers for blocks we aren't deleting,
 	 * but it's the closest thing in bufmgr's API.
 	 */
-	i = FlushRelationBuffers(onerel, new_rel_pages);
-	if (i < 0)
-		elog(ERROR, "FlushRelationBuffers returned %d", i);
+	FlushRelationBuffers(onerel, new_rel_pages);
 
 	/*
 	 * Do the physical truncation.

src/backend/storage/buffer/bufmgr.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.167 2004/05/31 03:48:02 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.168 2004/05/31 19:24:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1287,9 +1287,7 @@ PrintPinnedBufs(void)
  *
  *		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.
+ *		actually removed from the buffer pool.
  *
  *		This is called by DROP TABLE to clear buffers for the relation
  *		from the buffer pool.  Note that we must write dirty buffers,
@@ -1319,13 +1317,11 @@ PrintPinnedBufs(void)
  *		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 CLEAR DIRTY BIT, -2 - PINNED
- *
  *		XXX currently it sequentially searches the buffer pool, should be
  *		changed to more clever ways of searching.
  * --------------------------------------------------------------------
  */
-int
+void
 FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
 {
 	int			i;
@@ -1364,18 +1360,15 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
 					error_context_stack = errcontext.previous;
 				}
 				if (LocalRefCount[i] > 0)
-				{
-					elog(WARNING, "FlushRelationBuffers(\"%s\" (local), %u): block %u is referenced (%d)",
+					elog(ERROR, "FlushRelationBuffers(\"%s\" (local), %u): block %u is referenced (%d)",
 						 RelationGetRelationName(rel), firstDelBlock,
 						 bufHdr->tag.blockNum, LocalRefCount[i]);
-					return (-2);
-				}
 				if (bufHdr->tag.blockNum >= firstDelBlock)
 					bufHdr->tag.rnode.relNode = InvalidOid;
 			}
 		}
 
-		return 0;
+		return;
 	}
 
 	LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
@@ -1403,31 +1396,21 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
 				}
 				UnpinBuffer(bufHdr);
 				if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
-				{
-					LWLockRelease(BufMgrLock);
-					elog(WARNING, "FlushRelationBuffers(\"%s\", %u): block %u was re-dirtied",
+					elog(ERROR, "FlushRelationBuffers(\"%s\", %u): block %u was re-dirtied",
 						 RelationGetRelationName(rel), firstDelBlock,
 						 bufHdr->tag.blockNum);
-					return -1;
-				}
 			}
 			if (bufHdr->refcount != 0)
-			{
-				LWLockRelease(BufMgrLock);
-				elog(WARNING, "FlushRelationBuffers(\"%s\", %u): block %u is referenced (private %d, global %u)",
+				elog(ERROR, "FlushRelationBuffers(\"%s\", %u): block %u is referenced (private %d, global %u)",
 					 RelationGetRelationName(rel), firstDelBlock,
 					 bufHdr->tag.blockNum,
 					 PrivateRefCount[i], bufHdr->refcount);
-				return -2;
-			}
 			if (bufHdr->tag.blockNum >= firstDelBlock)
 				StrategyInvalidateBuffer(bufHdr);
 		}
 	}
 
 	LWLockRelease(BufMgrLock);
-
-	return 0;
 }
 
 /*

src/include/storage/bufmgr.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.81 2004/05/31 03:48:10 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.82 2004/05/31 19:24:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -152,7 +152,7 @@ extern void FlushBufferPool(void);
 extern BlockNumber BufferGetBlockNumber(Buffer buffer);
 extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
 extern void RelationTruncate(Relation rel, BlockNumber nblocks);
-extern int	FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock);
+extern void FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock);
 extern void DropRelationBuffers(Relation rel);
 extern void DropRelFileNodeBuffers(RelFileNode rnode, bool istemp,
 								   BlockNumber firstDelBlock);