MDEV-31347 fil_ibd_create() may hijack the file handle of an old file

fil_space_t::add(): If a file handle was passed, invoke fil_node_t::find_metadata() before releasing fil_system.mutex. The call was moved from fil_ibd_create(). This is a 10.5 version of commit e3b0615 from 10.6.

Author: dr-m

storage/innobase/fil/fil0fil.cc

@@ -350,6 +350,7 @@ fil_node_t* fil_space_t::add(const char* name, pfs_os_file_t handle,
 this->size += size;
 UT_LIST_ADD_LAST(chain, node);
 if (node->is_open()) {
+node->find_metadata(node->handle);
 n_pending.fetch_and(~CLOSING, std::memory_order_relaxed);
 if (++fil_system.n_open >= srv_max_n_open_files) {
 reacquire();
@@ -2433,7 +2434,6 @@ fil_ibd_create(
 mtr.log_file_op(FILE_CREATE, space_id, node->name);
 mtr.commit();
 
-node->find_metadata(file);
 *err = DB_SUCCESS;
 return space;
 }