Index: src/backend/utils/adt/dbsize.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/dbsize.c,v
retrieving revision 1.14
diff -c -r1.14 dbsize.c
*** src/backend/utils/adt/dbsize.c	29 Aug 2007 17:24:29 -0000	1.14
--- src/backend/utils/adt/dbsize.c	12 Oct 2007 14:38:32 -0000
***************
*** 164,171 ****
  	/*
  	 * User must have CREATE privilege for target tablespace, either explicitly
  	 * granted or implicitly because it is default for current database.
  	 */
! 	if (tblspcOid != MyDatabaseTableSpace)
  	{
  		aclresult = pg_tablespace_aclcheck(tblspcOid, GetUserId(), ACL_CREATE);
  		if (aclresult != ACLCHECK_OK)
--- 164,175 ----
  	/*
  	 * User must have CREATE privilege for target tablespace, either explicitly
  	 * granted or implicitly because it is default for current database.
+ 	 *
+ 	 * Specifically check for superuser permissions here, since
+ 	 * pg_tablespace_aclcheck() will deny access to pg_global even for
+ 	 * superusers.
  	 */
! 	if (tblspcOid != MyDatabaseTableSpace && !superuser())
  	{
  		aclresult = pg_tablespace_aclcheck(tblspcOid, GetUserId(), ACL_CREATE);
  		if (aclresult != ACLCHECK_OK)