linux-kernel - Re: [PATCH 0/5] net: sysctl: share ipv4/ipv6 sysctl tables

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Message-ID: <AANLkTi=Wg3_Uqrb=scquU9UojEJ_R_UyYhSYK6igt5sa@mail.gmail.com>
Date:	Sat, 5 Feb 2011 16:59:04 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Octavian Purdila <opurdila@...acom.com>
Subject: Re: [PATCH 0/5] net: sysctl: share ipv4/ipv6 sysctl tables

On Sat, Feb 5, 2011 at 4:26 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:
>> I'm not sure what I have to do to pass the name of a device (e.g.
>> "eth0") instead of "default" but at least "default" and "all" work and
>> have valid dentries.
>
> You do ->parent->procname.
>
> But, but you removed parent.


To be more exact I do:
  const char *dev_name = filp->f_path.dentry->d_parent->d_name.name;


If the sysctl table is shared between all network devices, the last
registered node will set the ->parent.

So accessing /proc/sys/net/ipv4/conf/$DEVNAME/$CTL will access $CTL
for the last network device registered not for $DEVNAME.

-- 
 .
..: Lucian
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