netdev - Re: [Lguest] [PATCH 4/5] lguest: use KVM hypercalls

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Message-ID: <20090415140819.GA11991@gondor.apana.org.au>
Date:	Wed, 15 Apr 2009 22:08:19 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Matias Zabaljauregui <zabaljauregui@...il.com>, odie@...aau.dk,
	Rusty Russell <rusty@...tcorp.com.au>, lguest@...abs.org,
	virtualization@...ts.osdl.org,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [Lguest] [PATCH 4/5] lguest: use KVM hypercalls

On Wed, Apr 15, 2009 at 07:06:10AM -0700, Eric W. Biederman wrote:
>
> There is the boring rmmod case that has always existed.
> 
> There is more interesting case of moving your tap device
> into another network namespace.
> 
> In which case there is the possibility of the network namespace
> exiting and destroying all of the virtual network devices before
> we close the file handle.

In that case what's the problem with holding a refcount to the
unregistered device until the process owning the fd closes it?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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