Re: [RFC][PATCH] rbind across namespaces

[Miklos Szeredi]

> > I still see a problem: what if old_nd.mnt is already detached, and
> > bind is non-recursive.  Now it fails with EINVAL, though it used to
> > work (and I think is very useful).
> 
> Hey, you just made another argument for not detaching mounts when the
> last task with that current->namespace exits, but instead detaching
> mounts when the last reference to any vfsmnt in the namespace is dropped.
> 
> Hint :)

I have a better idea:

 - create a "dead_mounts" namespace.
 - chain each detached mount's ->mnt_list on dead_mounts->list
 - set mnt_namespace to dead_mounts
 - export the list via proc through the usual mount list interface

The last would be a nice bonus: I've always wanted to see the list of
detached, but not-yet destroyed mounts.

Does anybody see a problem with that?

Miklos
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