linux-kernel - Re: Duplicate SYSFS entries???

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Date:	Fri, 25 Apr 2008 21:57:12 -0700
From:	Greg KH <greg@...ah.com>
To:	"Fischer, Anna" <anna.fischer@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Duplicate SYSFS entries???

On Tue, Apr 22, 2008 at 04:06:02PM +0000, Fischer, Anna wrote:
> I'm creating a SYSFS hierarchy that consists of several symlinks that
> I'm generating by calling sysfs_create_link(). However, I realized
> that when I'm calling this with a link name that is already in the
> directory, I actually don't get an error back but the kernel creates
> another symlink with the same name, but the destination of the link is
> arbitrary. For example, this has created the following structure under
> SYSFS on my system:
> 
> ls -l /X
> 
> total 0
> lrwxrwxrwx 1 root root 0 2008-04-22 16:37 00:13:21:1f:2d:35 -> ../../../vnetmod/vms/vm0
> lrwxrwxrwx 1 root root 0 2008-04-22 16:37 00:50:56:19:a6:01 -> ../../../vnetmod/vms/vm13
> lrwxrwxrwx 1 root root 0 2008-04-22 16:37 00:50:56:19:a6:01 -> ../../../vnetmod/vms/vm13
> lrwxrwxrwx 1 root root 0 2008-04-22 16:37 00:50:56:19:a6:01 -> ../../../vnetmod/vms/vm13
> lrwxrwxrwx 1 root root 0 2008-04-22 16:37 00:50:56:19:a6:01 -> ../../../vnetmod/vms/vm13
> 
> 
> Actually, I have created the symlinks with different target
> directories but they all (obviously) point to the same one (vm13).
> Shouldn't the kernel return an error code and disallow the creation of
> multiple files (or symlinks) with the same name in the same
> directory??
> 
> I'm running kernel version 2.6.16.13-4-smp #1 SMP Wed May 3 04:53:23 UTC 2006 x86_64 x86_64 x86_64 GNU/Linux.

2.6.16 is over 2 years old.  This issue has been fixed in the thousands
of changes since then :)

Please upgrade.

greg k-h
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