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

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Message-Id: <20110619.162218.1110628316477222542.davem@davemloft.net>
Date:	Sun, 19 Jun 2011 16:22:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	containers@...ts.osdl.org, adobriyan@...il.com,
	netdev@...r.kernel.org, equinox@...c24.net,
	linux-kernel@...r.kernel.org, serge@...lyn.com
Subject: Re: [PATCH 2/2] proc: Usable inode numbers for the namespace file
 descriptors.

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Fri, 17 Jun 2011 16:33:19 -0700

> 
> 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>

For networking bits:

Acked-by: David S. Miller <davem@...emloft.net>
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