I'd like to get a first round of review on my AXFS filesystem.I like the general approach of it. It's much more flexible than the ext2 extension I've done, and the possibility to select XIP vs. compression per page is really really neat. I can imagine that people will prefer this over the ext2 implementation on s390. It is unclear to me how the "secondary block device" thing is supposed to work. Could you elaborate a bit on that?