linux-kernel - Re: sysfs regression: wrong link counts

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Date:	Wed, 1 Feb 2012 19:29:15 +0100
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: sysfs regression: wrong link counts

On poniedziałek, 30 stycznia 2012 o 22:56:26 Jiri Slaby wrote:
> Hi,
> 
> I cannot boot properly with this commit:
> commit 524b6c5b39b931311dfe5a2f5abae2f5c9731676
> Author: Eric W. Biederman <ebiederm@...ssion.com>
> Date:   Sun Dec 18 20:09:31 2011 -0800
> 
>     sysfs: Kill nlink counting.
> 
> 
> 1) network systemd rule doesn't start network
> 2) sensors complain:
>    sensors_init: Kernel interface error
> 
> ad 2) look at what it does:
> /* returns !0 if sysfs filesystem was found, 0 otherwise */
> int sensors_init_sysfs(void)
> {
>         struct stat statbuf;
> 
>         snprintf(sensors_sysfs_mount, NAME_MAX, "%s", "/sys");
>         if (stat(sensors_sysfs_mount, &statbuf) < 0
> 
>          || statbuf.st_nlink <= 2)      /* Empty directory */
> 
>                 return 0;
> 
>         return 1;
> }
> 
> 
> So this looks like it became a part of ABI we cannot break...
> 
> A revert of this commit on the top of today's -next fixes the problem.
> 
> thanks,

I created a Bugzilla entry at 
https://bugzilla.kernel.org/show_bug.cgi?id=42712
for your bug report, please add your address to the CC list in there, thanks!
-- 
Maciej Rutecki
http://www.mrutecki.pl
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