netdev - Re: [PATCH 7/8] net: Allow setting the network namespace by fd

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Message-ID: <4C9CABB4.3010002@fr.ibm.com>
Date:	Fri, 24 Sep 2010 15:46:28 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-kernel@...r.kernel.org,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Ulrich Drepper <drepper@...il.com>, netdev@...r.kernel.org,
	Jonathan Corbet <corbet@....net>,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-fsdevel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Ben Greear <greearb@...delatech.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH 7/8] net: Allow setting the network namespace by fd

On 09/23/2010 10:51 AM, Eric W. Biederman wrote:
>
> Take advantage of the new abstraction and allow network devices
> to be placed in any network namespace that we have a fd to talk
> about.
>
> Signed-off-by: Eric W. Biederman<ebiederm@...ssion.com>
> ---

[ ... ]

> +struct net *get_net_ns_by_fd(int fd)
> +{
> +	struct proc_inode *ei;
> +	struct file *file;
> +	struct net *net;
> +
> +	file = NULL;
> +	net = ERR_PTR(-EINVAL);
> +	file = proc_ns_fget(fd);
> +	if (!fd)
> +		goto out;
> +		return ERR_PTR(-EINVAL);
> +
> +	ei = PROC_I(file->f_dentry->d_inode);
> +	if (ei->ns_ops !=&netns_operations)
> +		goto out;

Is this check necessary here ? proc_ns_fget checks "file->f_op != 
&ns_file_operations", no ?
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