merge into mysql-5.1-bugteam

mysql-test/r/partition_open_files_limit.result

+DROP TABLE IF EXISTS `t1`;
+# Bug#46922: crash when adding partitions and open_files_limit is reached
+CREATE TABLE t1 (a INT PRIMARY KEY) 
+ENGINE=MyISAM PARTITION BY KEY () PARTITIONS 1;
+INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11);
+# if the bug exists, then crash will happen here
+ALTER TABLE t1 ADD PARTITION PARTITIONS 511;
+ERROR HY000: Out of resources when opening file '<partition file>' (Errcode: 24)
+SELECT * FROM t1;
+a
+1
+10
+11
+2
+3
+4
+5
+6
+7
+8
+9
+DROP TABLE t1;

mysql-test/t/partition_open_files_limit-master.opt

+--open-files-limit=5 --max_connections=2 --table_open_cache=1

mysql-test/t/partition_open_files_limit.test

+--source include/have_partition.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS `t1`;
+--enable_warnings
+
+#
+--echo # Bug#46922: crash when adding partitions and open_files_limit is reached
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) 
+ENGINE=MyISAM PARTITION BY KEY () PARTITIONS 1;
+INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11);
+--echo # if the bug exists, then crash will happen here
+--replace_regex /file '.*'/file '<partition file>'/
+--error 23
+ALTER TABLE t1 ADD PARTITION PARTITIONS 511;
+--sorted_result
+SELECT * FROM t1;
+DROP TABLE t1;

sql/ha_partition.cc

@@ -1280,10 +1280,10 @@ void ha_partition::cleanup_new_partition(uint part_count)
     m_file= m_added_file;
     m_added_file= NULL;
 
+    external_lock(ha_thd(), F_UNLCK);
     /* delete_table also needed, a bit more complex */
     close();
 
-    m_added_file= m_file;
     m_file= save_m_file;
   }
   DBUG_VOID_RETURN;