here it is as requested by Bruce.

I tested it restoring my database with > 100000 BLOBS, and dumping it out.
But unfortunatly I can not restore it back due to problems in pg_dump.

--
Sincerely Yours,
Denis Perchine

src/backend/catalog/Makefile

@@ -2,7 +2,7 @@
 #
 # Makefile for catalog
 #
-# $Header: /cvsroot/pgsql/src/backend/catalog/Makefile,v 1.28 2000/10/20 21:03:42 petere Exp $
+# $Header: /cvsroot/pgsql/src/backend/catalog/Makefile,v 1.29 2000/10/21 15:55:21 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -11,7 +11,8 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 OBJS = catalog.o heap.o index.o indexing.o aclchk.o \
-       pg_aggregate.o pg_operator.o pg_proc.o pg_type.o
+       pg_aggregate.o pg_largeobject.o pg_operator.o pg_proc.o \
+       pg_type.o
 
 BKIFILES = global.bki template1.bki global.description template1.description
 
@@ -29,7 +30,7 @@ TEMPLATE1_BKI_SRCS := $(addprefix $(top_srcdir)/src/include/catalog/,\
 	pg_proc.h pg_type.h pg_attribute.h pg_class.h \
 	pg_inherits.h pg_index.h pg_statistic.h \
 	pg_operator.h pg_opclass.h pg_am.h pg_amop.h pg_amproc.h \
-	pg_language.h \
+	pg_language.h pg_largeobject.h \
 	pg_aggregate.h pg_ipl.h pg_inheritproc.h \
 	pg_rewrite.h pg_listener.h pg_description.h indexing.h \
     )

src/backend/catalog/indexing.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.69 2000/10/08 03:53:13 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.70 2000/10/21 15:55:21 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -51,6 +51,8 @@ char	   *Name_pg_inherits_indices[Num_pg_inherits_indices] =
 {InheritsRelidSeqnoIndex};
 char	   *Name_pg_language_indices[Num_pg_language_indices] =
 {LanguageOidIndex, LanguageNameIndex};
+char	   *Name_pg_largeobject_indices[Num_pg_largeobject_indices] =
+{LargeobjectLOIdIndex, LargeobjectLOIdPNIndex};
 char	   *Name_pg_listener_indices[Num_pg_listener_indices] =
 {ListenerPidRelnameIndex};
 char	   *Name_pg_opclass_indices[Num_pg_opclass_indices] =

src/backend/catalog/pg_largeobject.c

@@ -0,0 +1,135 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_largeobject.c
+ *	  routines to support manipulation of the pg_largeobject relation
+ *
+ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/pg_largeobject.c,v 1.3 2000/10/21 15:55:21 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/genam.h"
+#include "access/heapam.h"
+#include "catalog/catname.h"
+#include "catalog/indexing.h"
+#include "catalog/pg_largeobject.h"
+#include "miscadmin.h"
+#include "utils/fmgroids.h"
+
+bytea *_byteain(const char *data, int32 size);
+
+bytea *_byteain(const char *data, int32 size) {
+	bytea	*result;
+
+	result = (bytea *)palloc(size + VARHDRSZ);
+	result->vl_len = size + VARHDRSZ;
+	if (size > 0)
+		memcpy(result->vl_dat, data, size);
+	
+	return result;
+}
+
+Oid LargeobjectCreate(Oid loid) {
+	Oid		retval;
+  	Relation        	pg_largeobject;
+	HeapTuple	ntup = (HeapTuple) palloc(sizeof(HeapTupleData));
+	Relation		idescs[Num_pg_largeobject_indices];
+	Datum		values[Natts_pg_largeobject];
+	char		nulls[Natts_pg_largeobject];
+	int		i;
+
+	for (i=0; i<Natts_pg_largeobject; i++) {
+		nulls[i] = ' ';
+		values[i] = (Datum)NULL;
+	}
+
+	i = 0;
+	values[i++] = ObjectIdGetDatum(loid);
+	values[i++] = Int32GetDatum(0);
+	values[i++] = (Datum) _byteain(NULL, 0);
+	
+	pg_largeobject = heap_openr(LargeobjectRelationName, RowExclusiveLock);
+	ntup = heap_formtuple(pg_largeobject->rd_att, values, nulls);
+	retval = heap_insert(pg_largeobject, ntup);
+
+	if (!IsIgnoringSystemIndexes()) {
+		CatalogOpenIndices(Num_pg_largeobject_indices, Name_pg_largeobject_indices, idescs);
+		CatalogIndexInsert(idescs, Num_pg_largeobject_indices, pg_largeobject, ntup);
+		CatalogCloseIndices(Num_pg_largeobject_indices, idescs);
+	}
+	
+	heap_close(pg_largeobject, RowExclusiveLock);
+	heap_freetuple(ntup);
+	
+	CommandCounterIncrement();
+
+	return retval;
+}
+
+void LargeobjectDrop(Oid loid) {
+	Relation	pg_largeobject;
+	Relation	pg_lo_id;
+	ScanKeyData	skey;
+	IndexScanDesc	sd = (IndexScanDesc) NULL;
+	RetrieveIndexResult	indexRes;
+	int	found = 0;
+
+	ScanKeyEntryInitialize(&skey,
+					    (bits16) 0x0,
+					    (AttrNumber) 1,
+					    (RegProcedure) F_OIDEQ,
+					    ObjectIdGetDatum(loid));
+
+	pg_largeobject = heap_openr(LargeobjectRelationName, RowShareLock);
+	pg_lo_id = index_openr(LargeobjectLOIdIndex);
+
+	sd = index_beginscan(pg_lo_id, false, 1, &skey);
+
+	while((indexRes = index_getnext(sd, ForwardScanDirection))) {
+		found++;
+		heap_delete(pg_largeobject, &indexRes->heap_iptr, NULL);
+		pfree(indexRes);
+	}
+
+	index_endscan(sd);
+
+	index_close(pg_lo_id);
+	heap_close(pg_largeobject, RowShareLock);
+	if (found == 0)
+		elog(ERROR, "LargeobjectDrop: large object %d not found", loid);
+}
+
+int LargeobjectFind(Oid loid) {
+	int	retval = 0;
+	Relation	pg_lo_id;
+	ScanKeyData	skey;
+	IndexScanDesc	sd = (IndexScanDesc) NULL;
+	RetrieveIndexResult	indexRes;
+
+	ScanKeyEntryInitialize(&skey,
+					    (bits16) 0x0,
+					    (AttrNumber) 1,
+					    (RegProcedure) F_OIDEQ,
+					    ObjectIdGetDatum(loid));
+
+	pg_lo_id = index_openr(LargeobjectLOIdIndex);
+
+	sd = index_beginscan(pg_lo_id, false, 1, &skey);
+
+	if ((indexRes = index_getnext(sd, ForwardScanDirection))) {
+		retval = 1;
+		pfree(indexRes);
+	}
+
+	index_endscan(sd);
+
+	index_close(pg_lo_id);
+	return retval;
+}
+

src/backend/libpq/be-fsstubs.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.52 2000/10/08 03:53:13 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.53 2000/10/21 15:55:22 momjian Exp $
  *
  * NOTES
  *	  This should be moved to a more appropriate place.  It is here
@@ -267,7 +267,7 @@ lo_creat(PG_FUNCTION_ARGS)
 		PG_RETURN_OID(InvalidOid);
 	}
 
-	lobjId = RelationGetRelid(lobjDesc->heap_r);
+	lobjId = lobjDesc->id;
 
 	inv_close(lobjDesc);
 
@@ -512,8 +512,10 @@ lo_commit(bool isCommit)
 	{
 		if (cookies[i] != NULL)
 		{
+/*
 			if (isCommit)
 				inv_cleanindex(cookies[i]);
+*/
 			cookies[i] = NULL;
 		}
 	}

src/bin/pg_dump/pg_dump.c

@@ -22,7 +22,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.170 2000/10/13 00:43:31 pjw Exp $
+ *	  $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_dump.c,v 1.171 2000/10/21 15:55:26 momjian Exp $
  *
  * Modifications - 6/10/96 - dave@bensoft.com - version 1.13.dhb
  *
@@ -1104,7 +1104,7 @@ dumpBlobs(Archive *AH, char* junkOid, void *junkVal)
 		fprintf(stderr, "%s saving BLOBs\n", g_comment_start);
 
 	/* Cursor to get all BLOB tables */
-    appendPQExpBuffer(oidQry, "Declare blobOid Cursor for SELECT oid from pg_class where relkind = '%c'", RELKIND_LOBJECT);
+    appendPQExpBuffer(oidQry, "Declare blobOid Cursor for SELECT loid from pg_largeobject");
 
 	res = PQexec(g_conn, oidQry->data);
 	if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)

src/include/catalog/catname.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: catname.h,v 1.14 2000/10/08 03:53:15 momjian Exp $
+ * $Id: catname.h,v 1.15 2000/10/21 15:55:28 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -29,6 +29,7 @@
 #define  InheritsRelationName "pg_inherits"
 #define  InheritancePrecidenceListRelationName "pg_ipl"
 #define  LanguageRelationName "pg_language"
+#define  LargeobjectRelationName "pg_largeobject"
 #define  ListenerRelationName "pg_listener"
 #define  LogRelationName "pg_log"
 #define  OperatorClassRelationName "pg_opclass"

src/include/catalog/indexing.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: indexing.h,v 1.42 2000/10/08 03:53:15 momjian Exp $
+ * $Id: indexing.h,v 1.43 2000/10/21 15:55:28 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -31,6 +31,7 @@
 #define Num_pg_index_indices		2
 #define Num_pg_inherits_indices		1
 #define Num_pg_language_indices		2
+#define Num_pg_largeobject_indices		2
 #define Num_pg_listener_indices		1
 #define Num_pg_opclass_indices		2
 #define Num_pg_operator_indices		2
@@ -62,6 +63,8 @@
 #define InheritsRelidSeqnoIndex		"pg_inherits_relid_seqno_index"
 #define LanguageNameIndex			"pg_language_name_index"
 #define LanguageOidIndex			"pg_language_oid_index"
+#define LargeobjectLOIdIndex			"pg_largeobject_loid_index"
+#define LargeobjectLOIdPNIndex			"pg_largeobject_loid_pn_index"
 #define ListenerPidRelnameIndex		"pg_listener_pid_relname_index"
 #define OpclassDeftypeIndex			"pg_opclass_deftype_index"
 #define OpclassNameIndex			"pg_opclass_name_index"
@@ -92,6 +95,7 @@ extern char *Name_pg_group_indices[];
 extern char *Name_pg_index_indices[];
 extern char *Name_pg_inherits_indices[];
 extern char *Name_pg_language_indices[];
+extern char *Name_pg_largeobject_indices[];
 extern char *Name_pg_listener_indices[];
 extern char *Name_pg_opclass_indices[];
 extern char *Name_pg_operator_indices[];
@@ -191,6 +195,8 @@ DECLARE_UNIQUE_INDEX(pg_index_indexrelid_index on pg_index using btree(indexreli
 DECLARE_UNIQUE_INDEX(pg_inherits_relid_seqno_index on pg_inherits using btree(inhrelid oid_ops, inhseqno int4_ops));
 DECLARE_UNIQUE_INDEX(pg_language_name_index on pg_language using btree(lanname name_ops));
 DECLARE_UNIQUE_INDEX(pg_language_oid_index on pg_language using btree(oid oid_ops));
+DECLARE_INDEX(pg_largeobject_loid_index on pg_largeobject using btree(loid oid_ops));
+DECLARE_UNIQUE_INDEX(pg_largeobject_loid_pn_index on pg_largeobject using btree(loid oid_ops, pageno int4_ops));
 DECLARE_UNIQUE_INDEX(pg_listener_pid_relname_index on pg_listener using btree(listenerpid int4_ops, relname name_ops));
 /* This column needs to allow multiple zero entries, but is in the cache */
 DECLARE_INDEX(pg_opclass_deftype_index on pg_opclass using btree(opcdeftype oid_ops));

src/include/catalog/pg_largeobject.h

@@ -0,0 +1,63 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_largeobject.h
+ *	  definition of the system "largeobject" relation (pg_largeobject)
+ *	  along with the relation's initial contents.
+ *
+ *
+ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: pg_largeobject.h,v 1.3 2000/10/21 15:55:28 momjian Exp $
+ *
+ * NOTES
+ *	  the genbki.sh script reads this file and generates .bki
+ *	  information from the DATA() statements.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_LARGEOBJECT_H
+#define PG_LARGEOBJECT_H
+
+/* ----------------
+ *		postgres.h contains the system type definintions and the
+ *		CATALOG(), BOOTSTRAP and DATA() sugar words so this file
+ *		can be read by both genbki.sh and the C compiler.
+ * ----------------
+ */
+
+/* ----------------
+ *		pg_largeobject definition.  cpp turns this into
+ *		typedef struct FormData_pg_largeobject. Large object id
+ *		is stored in loid;
+ * ----------------
+ */
+
+CATALOG(pg_largeobject)
+{
+	Oid			loid;
+	int4			pageno;
+	bytea			data;
+} FormData_pg_largeobject;
+
+/* ----------------
+ *		Form_pg_largeobject corresponds to a pointer to a tuple with
+ *		the format of pg_largeobject relation.
+ * ----------------
+ */
+typedef FormData_pg_largeobject *Form_pg_largeobject;
+
+/* ----------------
+ *		compiler constants for pg_largeobject
+ * ----------------
+ */
+#define Natts_pg_largeobject			3
+#define Anum_pg_largeobject_loid		1
+#define Anum_pg_largeobject_pageno		2
+#define Anum_pg_largeobject_data		3
+
+Oid LargeobjectCreate(Oid loid);
+void LargeobjectDrop(Oid loid);
+int LargeobjectFind(Oid loid);
+
+#endif	 /* PG_LARGEOBJECT_H */

src/include/storage/large_object.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: large_object.h,v 1.15 2000/10/08 03:53:15 momjian Exp $
+ * $Id: large_object.h,v 1.16 2000/10/21 15:55:29 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,17 +22,11 @@
 /*
  * This structure will eventually have lots more stuff associated with it.
  */
-typedef struct LargeObjectDesc
+typedef struct LargeObjectDesc {
-{
+	Relation	heap_r;
-	Relation	heap_r;			/* heap relation */
+	Relation	index_r;
-	Relation	index_r;		/* index relation on seqno attribute */
-	IndexScanDesc iscan;		/* index scan we're using */
-	TupleDesc	hdesc;			/* heap relation tuple desc */
-	TupleDesc	idesc;			/* index relation tuple desc */
-	uint32		lowbyte;		/* low byte on the current page */
-	uint32		highbyte;		/* high byte on the current page */
 	uint32		offset;			/* current seek pointer */
-	ItemPointerData htid;		/* tid of current heap tuple */
+	Oid		id;
 
 #define IFS_RDLOCK		(1 << 0)
 #define IFS_WRLOCK		(1 << 1)
@@ -55,7 +49,4 @@ extern int	inv_tell(LargeObjectDesc *obj_desc);
 extern int	inv_read(LargeObjectDesc *obj_desc, char *buf, int nbytes);
 extern int	inv_write(LargeObjectDesc *obj_desc, char *buf, int nbytes);
 
-/* added for buffer leak prevention [ PA ] */
-extern void inv_cleanindex(LargeObjectDesc *obj_desc);
-
 #endif	 /* LARGE_OBJECT_H */