DMF_SUSPENDED_INTERNALLY
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
DMF_SUSPENDED_INTERNALLY);
clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY);
return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);