Hi Bart, > Why does the above data structure only refer to SLC and MLC but not to > TLC or QLC? This has been discussed before. The data structure follows the virtio spec (https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html) > How will this data structure be extended without having to introduce a > new ioctl? There are no more lifetime parameters defined in the virtio spec. Please note that this is a virtio block specific ioctl, not a block generic one.