pg_upgrade: update C comments about pg_dumpall

There were some C comments that hadn't been updated from the switch of
using only pg_dumpall to using pg_dump and pg_dumpall, so update them.
Also, don't bother using --schema-only for pg_dumpall --globals-only.

Backpatch through 9.4

contrib/pg_upgrade/check.c

@@ -285,9 +285,9 @@ check_cluster_versions(void)
 				 PG_MAJORVERSION);
 
 	/*
-	 * We can't allow downgrading because we use the target pg_dumpall, and
-	 * pg_dumpall cannot operate on new database versions, only older
-	 * versions.
+	 * We can't allow downgrading because we use the target pg_dump, and
+	 * pg_dump cannot operate on newer database versions, only current and
+	 * older versions.
 	 */
 	if (old_cluster.major_version > new_cluster.major_version)
 		pg_fatal("This utility cannot be used to downgrade to older major PostgreSQL versions.\n");

contrib/pg_upgrade/dump.c

@@ -23,8 +23,8 @@ generate_old_dump(void)
 
 	/* run new pg_dumpall binary for globals */
 	exec_prog(UTILITY_LOG_FILE, NULL, true,
-			  "\"%s/pg_dumpall\" %s --schema-only --globals-only "
-			  "--quote-all-identifiers --binary-upgrade %s -f %s",
+			  "\"%s/pg_dumpall\" %s --globals-only --quote-all-identifiers "
+			  "--binary-upgrade %s -f %s",
 			  new_cluster.bindir, cluster_conn_opts(&old_cluster),
 			  log_opts.verbose ? "--verbose" : "",
 			  GLOBALS_DUMP_FILE);

contrib/pg_upgrade/exec.c

@@ -321,6 +321,7 @@ check_bin_dir(ClusterInfo *cluster)
 	{
 		/* these are only needed in the new cluster */
 		validate_exec(cluster->bindir, "psql");
+		validate_exec(cluster->bindir, "pg_dump");
 		validate_exec(cluster->bindir, "pg_dumpall");
 	}
 }

contrib/pg_upgrade/function.c

@@ -161,7 +161,7 @@ get_loadable_libraries(void)
 		/*
 		 * Systems that install plpython before 8.1 have
 		 * plpython_call_handler() defined in the "public" schema, causing
-		 * pg_dumpall to dump it.  However that function still references
+		 * pg_dump to dump it.  However that function still references
 		 * "plpython" (no "2"), so it throws an error on restore.  This code
 		 * checks for the problem function, reports affected databases to the
 		 * user and explains how to remove them. 8.1 git commit:

contrib/pg_upgrade/info.c

@@ -274,7 +274,7 @@ get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
 			   *last_tablespace = NULL;
 
 	/*
-	 * pg_largeobject contains user data that does not appear in pg_dumpall
+	 * pg_largeobject contains user data that does not appear in pg_dump
 	 * --schema-only output, so we have to copy that system table heap and
 	 * index.  We could grab the pg_largeobject oids from template1, but it is
 	 * easy to treat it as a normal table. Order by oid so we can join old/new

contrib/pg_upgrade/pg_upgrade.c

@@ -491,7 +491,7 @@ copy_clog_xlog_xid(void)
  *
  *	We have frozen all xids, so set relfrozenxid and datfrozenxid
  *	to be the old cluster's xid counter, which we just set in the new
- *	cluster.  User-table frozenxid values will be set by pg_dumpall
+ *	cluster.  User-table frozenxid values will be set by pg_dump
  *	--binary-upgrade, but objects not set by the pg_dump must have
  *	proper frozen counters.
  */