linux-kernel - Re: [PATCH 10/11] netns: Enable tagging for net

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Date:	Mon, 23 Jun 2008 11:18:12 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Benjamin Thery <benjamin.thery@...l.net>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 10/11] netns: Enable tagging for net_class directories
 in sysfs

Benjamin Thery wrote:
> --- linux-mm.orig/fs/sysfs/mount.c
> +++ linux-mm/fs/sysfs/mount.c
> @@ -16,6 +16,8 @@
>  #include <linux/mount.h>
>  #include <linux/pagemap.h>
>  #include <linux/init.h>
> +#include <linux/nsproxy.h>
> +#include <net/net_namespace.h>
>  
>  #include "sysfs.h"
>  
> @@ -78,6 +80,7 @@ static int sysfs_fill_super(struct super
>  	root->d_sb = sb;
>  	sb->s_root = root;
>  	sb->s_fs_info = info;
> +	info->tag.net_ns = hold_net(current->nsproxy->net_ns);
>  	return 0;
>  
>  out_err:
> @@ -95,6 +98,9 @@ static int sysfs_test_super(struct super
>  	struct sysfs_super_info *info = sysfs_info(sb);
>  	int found = 1;
>  
> +	if (task->nsproxy->net_ns != info->tag.net_ns)
> +		found = 0;
> +
>  	return found;
>  }
>  
> @@ -131,6 +137,8 @@ static void sysfs_kill_sb(struct super_b
>  	struct sysfs_super_info *info = sysfs_info(sb);
>  
>  	kill_anon_super(sb);
> +	if (info->tag.net_ns)
> +		release_net(info->tag.net_ns);
>  	kfree(info);
>  }

Ouch... Please don't hard code net_ns functions directly from sysfs.
Please make a proper abstraction for ns, make net_ns register it and
sysfs test the abstract ns.

Thanks.

-- 
tejun
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