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A fix for Bug#41158 "DROP TABLE holds LOCK_open during unlink()".

Browse Source 
Remove acquisition of LOCK_open around file system operations,
since such operations are now protected by metadata locks.
Rework table discovery algorithm to not require LOCK_open.

No new tests added since all MDL locking operations are covered
in lock.test and mdl_sync.test, and as long as these tests
pass despite the increased concurrency, consistency must be
unaffected.
This commit is contained in:
Konstantin Osipov
2010-08-09 22:33:47 +04:00
parent 9862f8c756
commit f8bfa3287d
19 changed files with 219 additions and 320 deletions
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4
sql/sql_truncate.cc
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@ -310,10 +310,8 @@ static bool open_and_lock_table_for_truncate(THD *thd, TABLE_LIST *table_ref,
upgrade_shared_lock_to_exclusive(table_ref->mdl_request.ticket,
timeout))
DBUG_RETURN(TRUE);
mysql_mutex_lock(&LOCK_open);
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, table_ref->db,
table_ref->table_name);
mysql_mutex_unlock(&LOCK_open);
table_ref->table_name, FALSE);
}
}
else