MT_IO_FLAGS_RUNNING
if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);