Move all ddl log code to ddl_log.cc and ddl_log.h

Part of prepration for: MDEV-17567 Atomic DDL No notable code changes except moving code around
2025-08-08 11:22:35 +03:00 · 2020-10-02 15:59:06 +03:00
parent a28ea028af
commit 02b6cef45e
10 changed files with 1278 additions and 1219 deletions
--- a/sql/ddl_log.h
+++ b/sql/ddl_log.h
@@ -0,0 +1,111 @@
+/*
+   Copyright (c) 2000, 2019, Oracle and/or its affiliates.
+   Copyright (c) 2010, 2020, MariaDB
+
+   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 02110-1335  USA
+*/
+
+/* External interfaces to ddl log functions */
+
+#ifndef DDL_LOG_INCLUDED
+#define DDL_LOG_INCLUDED
+
+enum ddl_log_entry_code
+{
+  /*
+    DDL_LOG_EXECUTE_CODE:
+      This is a code that indicates that this is a log entry to
+      be executed, from this entry a linked list of log entries
+      can be found and executed.
+    DDL_LOG_ENTRY_CODE:
+      An entry to be executed in a linked list from an execute log
+      entry.
+    DDL_IGNORE_LOG_ENTRY_CODE:
+      An entry that is to be ignored
+  */
+  DDL_LOG_EXECUTE_CODE = 'e',
+  DDL_LOG_ENTRY_CODE = 'l',
+  DDL_IGNORE_LOG_ENTRY_CODE = 'i'
+};
+
+enum ddl_log_action_code
+{
+  /*
+    The type of action that a DDL_LOG_ENTRY_CODE entry is to
+    perform.
+    DDL_LOG_DELETE_ACTION:
+      Delete an entity
+    DDL_LOG_RENAME_ACTION:
+      Rename an entity
+    DDL_LOG_REPLACE_ACTION:
+      Rename an entity after removing the previous entry with the
+      new name, that is replace this entry.
+    DDL_LOG_EXCHANGE_ACTION:
+      Exchange two entities by renaming them a -> tmp, b -> a, tmp -> b.
+  */
+  DDL_LOG_DELETE_ACTION = 'd',
+  DDL_LOG_RENAME_ACTION = 'r',
+  DDL_LOG_REPLACE_ACTION = 's',
+  DDL_LOG_EXCHANGE_ACTION = 'e'
+};
+
+enum enum_ddl_log_exchange_phase {
+  EXCH_PHASE_NAME_TO_TEMP= 0,
+  EXCH_PHASE_FROM_TO_NAME= 1,
+  EXCH_PHASE_TEMP_TO_FROM= 2
+};
+
+
+typedef struct st_ddl_log_entry
+{
+  const char *name;
+  const char *from_name;
+  const char *handler_name;
+  const char *tmp_name;
+  uint next_entry;
+  uint entry_pos;
+  enum ddl_log_entry_code entry_type;
+  enum ddl_log_action_code action_type;
+  /*
+    Most actions have only one phase. REPLACE does however have two
+    phases. The first phase removes the file with the new name if
+    there was one there before and the second phase renames the
+    old name to the new name.
+  */
+  char phase;
+} DDL_LOG_ENTRY;
+
+typedef struct st_ddl_log_memory_entry
+{
+  uint entry_pos;
+  struct st_ddl_log_memory_entry *next_log_entry;
+  struct st_ddl_log_memory_entry *prev_log_entry;
+  struct st_ddl_log_memory_entry *next_active_log_entry;
+} DDL_LOG_MEMORY_ENTRY;
+
+
+bool write_ddl_log_entry(DDL_LOG_ENTRY *ddl_log_entry,
+                           DDL_LOG_MEMORY_ENTRY **active_entry);
+bool write_execute_ddl_log_entry(uint first_entry,
+                                   bool complete,
+                                   DDL_LOG_MEMORY_ENTRY **active_entry);
+bool deactivate_ddl_log_entry(uint entry_no);
+void release_ddl_log_memory_entry(DDL_LOG_MEMORY_ENTRY *log_entry);
+bool sync_ddl_log();
+void release_ddl_log();
+void execute_ddl_log_recovery();
+bool execute_ddl_log_entry(THD *thd, uint first_entry);
+
+extern mysql_mutex_t LOCK_gdl;
+#endif /* DDL_LOG_INCLUDED */