Hi Mingzhe, thanks for these patches. They resolve a specific bug we have open for a large NVME devices with non-zero optimal io size failing to register: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2016040. I have tested patches applied to mainline and some ubuntu kernels successfully, but only with regards to resolving the bug mentioned (have not tested online resizing). Are you planning further work or can this be merged soon? Rafael
