netdev - Re: [PATCH 2/2] proc: Usable inode numbers for the namespace file descriptors.

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Message-ID: <m1ei2o5ljy.fsf@fess.ebiederm.org>
Date:	Mon, 20 Jun 2011 12:50:57 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	Linux Containers <containers@...ts.osdl.org>,
	Alexey Dobriyan <adobriyan@...il.com>, netdev@...r.kernel.org,
	David Lamparter <equinox@...c24.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] proc: Usable inode numbers for the namespace file descriptors.

"Serge E. Hallyn" <serge@...lyn.com> writes:

> Quoting Eric W. Biederman (ebiederm@...ssion.com):
>> 
>> Assign a unique proc inode to each namespace, yielding an
>> identifier that userspace can use for identifying a namespace.
>> 
>> This has been a long requested feature and only blocked because
>> a naive implementation would put the id in a global space and
>> would ultimately require having a namespace for the names of
>> namespaces, making migration and certain virtualization tricks
>> impossible.
>> 
>> We still don't have per superblock inode numbers for proc, which
>> appears necessary for application unaware checkpoint/restart and
>> migrations (if the application is using namespace filedescriptors)
>> but that is now allowd by the design if it becomes important.
>> 
>> I have preallocated the ipc and uts initial proc inode numbers so
>> their structures can be statically initialized.
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>
> I've not looked at the setns patches enough, but from what I can see
> here it looks good.
>
> Acked-by: Serge Hallyn <serge@...lyn.com>

Thanks.

There are bugs in my existing proc bits that I am working on fixing so
this second patch will have a small update, before it gets merged.

But posting the patches I was looking for a little review and I was
announcing I had solved the technical problem of how we talk about
namespaces, without needing to introduce another namespace for
namespaces.

Eric
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