[Devel] Re: How to query mount propagation state?

[Ram Pai]

On Mon, 2007-04-16 at 12:34 +0200, Miklos Szeredi wrote:
> Currently one of the difficulties with mount propagations is that
> there's no way to know the current state of the propagation tree.
> 
> Has anyone thought about how this info could be queried from
> userspace?

I am attaching two patches that I had done way back in Oct 2006 
with Al Viro. I had sent these patches to Al Viro. But I forgot to
follow them up, I guess so did Al Viro.

The first patch disambiguates multiple mount-instances of the same
filesystem (or part of the same filesystem), by introducing a new
interface /proc/mounts_new. 

The second patch introduces a new proc interface that exposes all the
propagation trees within a namespace.  It does not show propagated
mounts residing in a different namespace (for privacy reasons). Maybe
one could modify the patch a little, to allow it; if the user has
root priviledges. 

RP

PS: Sorry these are attachments instead of inline patches. I am scared
of inlining in evolution. If needed I can send inline patches through
mutt.

> 
> Thanks,
> Miklos
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