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

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Message-ID: <20120130224350.GN23916@ZenIV.linux.org.uk>
Date:	Mon, 30 Jan 2012 22:43:50 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jiri Slaby <jslaby@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	systemd-devel@...ts.freedesktop.org
Subject: Re: sysfs regression: wrong link counts

On Mon, Jan 30, 2012 at 02:27:17PM -0800, Greg KH wrote:
> On Mon, Jan 30, 2012 at 10:10:59PM +0000, Alan Cox wrote:
> > > Isn't there some other "proper" way of doing this in userspace, or is
> > > this really the correct way?
> > 
> > You can look at the S_IFMT bits and stuff however link count indicating
> > number of subdirectories is a standard Unix thing and used by many quite
> > mundane tools as an optimisation.
> 
> Ah, yeah, that is easier.
> 
> Eric, care to fix this or want me to revert it?

Fix _what_?  Userland shite quoted upthread?  Because that's where the bug
is - the mundane tools mentioned by Alan treat 1 in st_nlink as "no
information about the number of subdirectories".  And shite might be too
mild a term for the little gem in question, really...
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