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In NVMe verson 2.0 and below, OPTPERF comprises only bit 4 of NSFEAT in the Identify Namespace structure. Since version 2.1, OPTPERF includes both bits 4 and 5 of NSFEAT. Replace the NVME_NS_FEAT_IO_OPT constant with NVME_NS_FEAT_OPTPERF_SHIFT, NVME_NS_FEAT_OPTPERF_MASK, and NVME_NS_FEAT_OPTPERF_MASK_2_1, representing the first bit, pre-2.1 bit width, and post-2.1 bit width of OPTPERF. Update nvme_update_disk_info() to check both OPTPERF bits for controllers that report version 2.1 or newer, as NPWG and NOWS are supported even if only bit 5 is set. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Signed-off-by: Keith Busch <kbusch@kernel.org>