Bill Jin f40ea8f4e6 MDEV-39548 Further cleanup of MDL_request boilerplate ...

- Change thd->backup_commit_lock from MDL_request* to MDL_ticket*,
  and convert related call sites in handler.cc, log.cc, sql_class.cc,
  and xa.cc to use MDL_ACQUIRE_LOCK.

- Convert reload_acl_and_cache() in sql_reload.cc, purge_master_logs()
  and reset_master() in sql_repl.cc to MDL_ACQUIRE_LOCK, holding the
  ticket in a local MDL_ticket* (these functions used a local
  MDL_request originally and should not touch thd->backup_commit_lock).

- Convert acquire_lock() in partition_info.cc to MDL_ACQUIRE_LOCK.

- Add MDL_REQUEST_LIST_ADD() helper for enqueuing lock requests into
  MDL_request_list, and convert call sites in sql_base.cc and sp.cc.

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.

2026-06-05 13:15:49 +04:00

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