NVME_NS_READY
set_bit(NVME_NS_READY, &ns->flags);
set_bit(NVME_NS_READY, &ns->flags);
clear_bit(NVME_NS_READY, &ns->flags);
clear_bit(NVME_NS_READY, &ns->flags);
!test_bit(NVME_NS_READY, &ns->flags))