To: linux-kernel@vger.kernel.org
From: Stephen Hemminger <shemminger@osdl.org>
Subject: Re: [Question] how to follow a symlink via a dentry?
Date: Tue, 23 May 2006 10:08:47 -0700
Organization: OSDL
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On Tue, 23 May 2006 12:56:03 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> What is the best way from inside the kernel, to find the dentry that
> another dentry points to via symlink?
> 
> Scenario:
> 
> I have a kobj of a device in the sysfs system.  Inside a directory of
> the kobj, is a symlink to another device I need to get.  I can find the
> dentry of the symlink, but I haven't found a good way to get to the
> dentry of what the symlink points to.
> 
> Is there a standard way to do this, or do I need to start hacking at the
> follow_link of the sysfs directory to get what I want?
> 
> Do I need to hack up something like page_readlink to get the path, and
> then do vfs_follow_link to get the rest.  Another thing is that I can't
> rely on what current->fs points to.
> 
> Thanks,
> 
> -- Steve
>

Sysfs reflects kernel object linkage, you should not be using
file access to find kernel objects.  You should use the pointers
instead.
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