> Given the existence of shared subtrees allowing/denying this at the mount
> namespace level is silly and wrong.
> 
> If we need more than just the filesystem permission checks can we
> make it a mount flag settable with mount and remount that allows
> non-privileged users the ability to create mount points under it
> in directories they have full read/write access to.

OK, that makes sense.

> I don't like the use of clone flags for this purpose but in this
> case the shared subtress are a much more fundamental reasons for not
> doing this at the namespace level.

I'll drop the clone flag, and add a mount flag instead.

Thanks,
Miklos
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