linux-kernel - Re: sysfs root link count broken in 2.6.22-git5

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Message-ID: <jeir8hqxmj.fsf@sykes.suse.de>
Date:	Wed, 18 Jul 2007 22:12:52 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Greg KH <gregkh@...e.de>, Tejun Heo <htejun@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sysfs root link count broken in 2.6.22-git5

Jean Delvare <khali@...ux-fr.org> writes:

> On Tue, 17 Jul 2007 20:38:28 -0700, Greg KH wrote:
>>                                            Isn't there some glibc
>> function that can detect the mount point of a filesystem or directory?
>> Something in glibc parses /proc/mounts for something, I can't remember
>> what it is right now though, sorry.
>
> Maybe getmntent(3)? Sure I could use this, but how expensive compared
> to a single stat(2).

How about comparing the device numbers of /sys and its parent?  If they
are different then /sys is a mount point.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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