I've added a patch at https://reviews.freebsd.org/D14681 for anyone who wants to take a look. While it doesn't (or at least shouldn't) change any current functionality, the point is to better automate the process of making a filesystem jail-aware.

Currently, this involves code changes in a few different places, mostly in expanding the list of allow.mount.* parameters. With this change, that list still contains all such filesystems, but only if they're actually present in the kernel (including when KLDs are loaded). The per-filesystem coding work is reduced to adding the VFCF_JAIL flag to the FS definition, and everything else is taken care of by the jail/vfs subsystems.

This originally came from a request to make NFS work with jails, which turns out to be a much bigger and unrelated thing, but still pointed me here.

- Jamie
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