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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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12
sql/sql_class.cc
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@ -1219,6 +1219,7 @@ void THD::init(bool skip_lock)
first_successful_insert_id_in_prev_stmt= 0;
first_successful_insert_id_in_prev_stmt_for_binlog= 0;
first_successful_insert_id_in_cur_stmt= 0;
current_backup_stage= BACKUP_FINISHED;
#ifdef WITH_WSREP
wsrep_exec_mode= wsrep_applier ? REPL_RECV : LOCAL_STATE;
wsrep_conflict_state= NO_CONFLICT;
@ -1487,6 +1488,7 @@ void THD::cleanup(void)
*/
mdl_context.release_transactional_locks();
backup_end(this);
/* Release the global read lock, if acquired. */
if (global_read_lock.is_acquired())
global_read_lock.unlock_global_read_lock(this);
@ -2494,6 +2496,16 @@ void THD::update_charset()
&not_used);
}
void THD::give_protection_error()
{
if (current_backup_stage != BACKUP_FINISHED)
my_error(ER_BACKUP_LOCK_IS_ACTIVE, MYF(0));
else
{
DBUG_ASSERT(global_read_lock.is_acquired());
my_error(ER_CANT_UPDATE_WITH_READLOCK, MYF(0));
}
}
/* routings to adding tables to list of changed in transaction tables */