Add large object access control.

A new system catalog pg_largeobject_metadata manages
ownership and access privileges of large objects.

KaiGai Kohei, reviewed by Jaime Casanova.

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.526 2009/12/09 21:57:51 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.527 2009/12/11 03:34:56 itagaki Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -38,6 +38,7 @@
 #include "commands/trigger.h"
 #include "funcapi.h"
 #include "libpq/auth.h"
+#include "libpq/be-fsstubs.h"
 #include "libpq/pqformat.h"
 #include "miscadmin.h"
 #include "optimizer/cost.h"
@@ -1226,6 +1227,16 @@ static struct config_bool ConfigureNamesBool[] =
 		false, NULL, NULL
 	},
 
+	{
+		{"lo_compat_privileges", PGC_SUSET, COMPAT_OPTIONS_PREVIOUS,
+			gettext_noop("Enables backward compatibility in privilege checks on large objects"),
+			gettext_noop("When turned on, privilege checks on large objects perform "
+						 "with backward compatibility as 8.4.x or earlier releases.")
+		},
+		&lo_compat_privileges,
+		false, NULL, NULL
+	},
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL

src/backend/utils/misc/postgresql.conf.sample

@@ -489,6 +489,7 @@
 #backslash_quote = safe_encoding	# on, off, or safe_encoding
 #default_with_oids = off
 #escape_string_warning = on
+#lo_compat_privileges = off
 #sql_inheritance = on
 #standard_conforming_strings = off
 #synchronize_seqscans = on