MDEV-28111 fixup: Correct the start-up message

By default, we should say "InnoDB: Buffered log writes" instead of
"InnoDB: File system buffers for log disabled" if we are able to
determine the physical block size on Linux.

storage/innobase/log/log0log.cc

@@ -223,7 +223,9 @@ void log_t::attach(log_file_t file, os_offset_t size)
   if (!block_size)
     set_block_size(512);
 # ifdef __linux__
-  else if (srv_file_flush_method != SRV_O_DSYNC)
+  else if (srv_file_flush_method != SRV_O_DSYNC &&
+           srv_file_flush_method != SRV_O_DIRECT &&
+           srv_file_flush_method != SRV_O_DIRECT_NO_FSYNC)
     sql_print_information("InnoDB: Buffered log writes (block size=%u bytes)",
                           block_size);
 #endif