On Do, 02.04.20 17:35, Miklos Szeredi (miklos@xxxxxxxxxx) wrote: > > systemd cares about all mount points in PID1's mount namespace. > > > > The fact that mount tables can grow large is why we want something > > better than constantly reparsing the whole /proc/self/mountinfo. But > > filtering subsets of that is something we don't really care about. > > I can accept that, but you haven't given a reason why that's so. > > What does it do with the fact that an automount point was crossed, for > example? How does that affect the operation of systemd? We don't care how a mount point came to be. If it's autofs or something else, we don't care. We don't access these mount points ourselves ever, we just watch their existance. I mean, it's not just about startup it's also about shutdown. At shutdown we need to unmount everything from the leaves towards the root so that all file systems are in a clean state. And that means *all* mounts, even autofs ones, even udisks ones, or whatever else established them, we don't care. I mean, the autofs daemon can die any time, we still must be able to sensibly shutdown, and thus unmount all mounts inside some autofs hierarchy at the right time, before unmounting the autofs top-level dir and then what might be further up the tree. systemd needs to know the whole tree, to figure out deps properly for things like that, hence we aren't interested in filtering, we are interested in minimizing what we do when something changes. Lennart -- Lennart Poettering, Berlin
