int nvme_get_features_volatile_wc (int fd , enum nvme_get_features_sel sel , __u32 *result );
File descriptor of nvme device
Select which type of attribute to return, see enum nvme_get_features_sel
The command completion result from CQE dword0
The nvme command status if a response was received (see enum nvme_status_field) or -1 with errno set otherwise.