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Added syntax and implementation for BACKUP STAGE's

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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()
This commit is contained in:
Monty
2018-11-13 01:34:37 +02:00
parent 965311ee8b
commit c53aab974b
38 changed files with 3530 additions and 41 deletions
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sql/sql_insert.cc
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@ -547,7 +547,7 @@ bool open_and_lock_for_insert_delayed(THD *thd, TABLE_LIST *table_list)
If this goes ok, the tickets are cloned and added to the list of granted
locks held by the handler thread.
*/
if (thd->global_read_lock.can_acquire_protection())
if (thd->has_read_only_protection())
DBUG_RETURN(TRUE);
protection_request.init(MDL_key::BACKUP, "", "", MDL_BACKUP_DML,