Cleanup: remove dead code which could also lead to race.

mysql-test/suite/galera/r/galera_read_only.result

+CREATE TABLE t1 (id INT PRIMARY KEY) ENGINE=InnoDB;
+SET GLOBAL read_only=TRUE;
+INSERT INTO t1 VALUES (1);
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+1
+CREATE USER foo@localhost;
+# Open connection to node 2 using 'foo' user.
+
+# Connect with foo_node_2
+INSERT INTO t1 VALUES (2);
+ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+1
+SET GLOBAL read_only=FALSE;
+DROP TABLE t1;
+DROP USER foo@localhost;

mysql-test/suite/galera/t/galera_read_only.test

+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+
+#
+# Ensure that the read_only option does not apply to Galera appliers and that replication
+# continues, the way MySQL replication would.
+#
+
+CREATE TABLE t1 (id INT PRIMARY KEY) ENGINE=InnoDB;
+
+--connection node_2
+SET GLOBAL read_only=TRUE;
+
+--connection node_1
+INSERT INTO t1 VALUES (1);
+
+--connection node_2
+SELECT COUNT(*) = 1 FROM t1;
+
+CREATE USER foo@localhost;
+
+--echo # Open connection to node 2 using 'foo' user.
+--let $port_2= \$NODE_MYPORT_2
+--connect(foo_node_2,127.0.0.1,foo,,test,$port_2,)
+
+--echo
+--echo # Connect with foo_node_2
+--connection foo_node_2
+--error ER_OPTION_PREVENTS_STATEMENT
+INSERT INTO t1 VALUES (2);
+
+--connection node_2
+SELECT COUNT(*) = 1 FROM t1;
+
+# Cleanup
+SET GLOBAL read_only=FALSE;
+DROP TABLE t1;
+DROP USER foo@localhost;
+

sql/sql_parse.cc

@@ -982,22 +982,6 @@ static my_bool deny_updates_if_read_only_option(THD *thd,
 }
 
 #ifdef WITH_WSREP
-static my_bool wsrep_read_only_option(THD *thd, TABLE_LIST *all_tables)
-{
-  int opt_readonly_saved = opt_readonly;
-  ulong flag_saved = (ulong)(thd->security_ctx->master_access & SUPER_ACL);
-
-  opt_readonly = 0;
-  thd->security_ctx->master_access &= ~SUPER_ACL;
-
-  my_bool ret = !deny_updates_if_read_only_option(thd, all_tables);
-
-  opt_readonly = opt_readonly_saved;
-  thd->security_ctx->master_access |= flag_saved;
-
-  return ret;
-}
-
 static void wsrep_copy_query(THD *thd)
 {
   thd->wsrep_retry_command   = thd->command;
@@ -1011,6 +995,7 @@ static void wsrep_copy_query(THD *thd)
   thd->wsrep_retry_query[thd->wsrep_retry_query_len] = '\0';
 }
 #endif /* WITH_WSREP */
+
 /**
   Perform one connection-level (COM_XXXX) command.
 
@@ -6355,8 +6340,7 @@ static void wsrep_mysql_parse(THD *thd, char *rawbuf, uint length,
   bool is_autocommit=
     !thd->in_multi_stmt_transaction_mode()                  &&
     thd->wsrep_conflict_state == NO_CONFLICT                &&
-    !thd->wsrep_applier                                     &&
-    wsrep_read_only_option(thd, thd->lex->query_tables);
+    !thd->wsrep_applier;
 
   do
   {