> I don't understand what you mean. If we hand out file handles with I don't think adding another highly privileged interface in opposition to exposing the mount id is warranted. The new mount id exposure patch is a performance improvement for existing use-cases to let userspace avoid additional system calls. Because as Aleksa showed in the commit message there's ways to make this race-free right now. The patch hasn't gained any Acks from Amir or Jeff so it's obviously not going to get merged. So really, I don't want another interface that goes from arbitrary superblock to file hidden behind yet another global capability check.
