Re: Introspecting userns relationships to other namespaces?

On Thu, Jul 07, 2016 at 08:01:52AM -0700, James Bottomley wrote:

In theory, we could get nsfs to show this information as an option
(just add a show_options entry to the superblock ops), but the
problem is that although each namespace has a parent user_ns,
there's no way to get it without digging in the namespace specific
structure.  Probably we should restructure to move it into
ns_common, then we could display it (and enforce all namespaces
having owning user_ns) but it would be a reasonably large (but
mechanical) change.

It sounds like everyone is either positive or or neutral on this
groundwork, even if we haven't decided if/how to expose the
information to userspace.  I'm happy to work up a patch while the rest
of the discussion continues.  I'm also happy to let someone else work
up the patch, if anyone else is chomping at the bit ;).

Cheers,
Trevor

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