cdef3abb25
fixes the 'cannot create 'nvme/foo': volume size must be a multiple of volume block size' error by always rounding the size up to the next 1M boundary. this is a workaround until https://github.com/zfsonlinux/zfs/issues/8541 is solved. the current manpage says 128k is the maximum blocksize, but a local test showed that values up to 1M are allowed. it might be possible to increase it even further (see f1512ee61). Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>