Added syntax and implementation for BACKUP STAGE's

Part of MDEV-5336 Implement LOCK FOR BACKUP

- Changed check of Global_only_lock to also include BACKUP lock.
- We store latest MDL_BACKUP_DDL lock in thd->mdl_backup_ticket to be able
  to downgrade lock during copy_data_between_tables()

1 files changed, 31 insertions, 0 deletions

diff --git a/sql/backup.h b/sql/backup.h
new file mode 100644
index 00000000000..e6f290ae9c8
--- /dev/null
+++ b/sql/backup.h
@@ -0,0 +1,31 @@
+#ifndef BACKUP_INCLUDED
+#define BACKUP_INCLUDED
+/* Copyright (c) 2018, MariaDB Corporation
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+enum backup_stages
+{
+  BACKUP_START, BACKUP_FLUSH, BACKUP_WAIT_FOR_FLUSH, BACKUP_LOCK_COMMIT,
+  BACKUP_END, BACKUP_FINISHED
+};
+
+extern TYPELIB backup_stage_names;
+
+void backup_init();
+bool run_backup_stage(THD *thd, backup_stages stage);
+bool backup_end(THD *thd);
+void backup_set_alter_copy_lock(THD *thd, TABLE *altered_table);
+bool backup_reset_alter_copy_lock(THD *thd);
+#endif /* BACKUP_INCLUDED */