libnvme(9)                        API Manual                        libnvme(9)

NAME
       enum nvme_id_ctrl_nwpc - This field indicates the optional namespace
       write protection capabilities supported by the controller.

SYNOPSIS
       enum nvme_id_ctrl_nwpc {
           NVME_CTRL_NWPC_WRITE_PROTECT ,
           NVME_CTRL_NWPC_WRITE_PROTECT_POWER_CYCLE ,
           NVME_CTRL_NWPC_WRITE_PROTECT_PERMANENT

       };

Constants
       NVME_CTRL_NWPC_WRITE_PROTECT
                   If set, then the controller shall support the No Write
                   Protect and Write Protect namespace write protection states
                   and may support the Write Protect Until Power Cycle state
                   and Permanent Write Protect namespace write protection
                   states.

       NVME_CTRL_NWPC_WRITE_PROTECT_POWER_CYCLE
                   If set, then the controller supports the Write Protect
                   Until Power Cycle state.

       NVME_CTRL_NWPC_WRITE_PROTECT_PERMANENT
                   If set, then the controller supports the Permanent Write
                   Protect state.

October 2026                enum nvme_id_ctrl_nwpc                  libnvme(9)