NVME_NSHEAD_QUEUE_IF_NO_PATH
set_bit(NVME_NSHEAD_QUEUE_IF_NO_PATH, &head->flags);
clear_bit(NVME_NSHEAD_QUEUE_IF_NO_PATH, &head->flags);
if (test_bit(NVME_NSHEAD_QUEUE_IF_NO_PATH, &head->flags))