[systemd-devel] sysfs regression: wrong link counts

Alan Cox alan at lxorguk.ukuu.org.uk
Tue Jan 31 03:54:47 PST 2012

On Mon, 30 Jan 2012 19:45:10 -0800
ebiederm at xmission.com (Eric W. Biederman) wrote:

> Alan Cox <alan at lxorguk.ukuu.org.uk> writes:
> >> 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.
> Those tools for a decade or better all know to treat nlink == 1 as the
> case where the optimization does not apply.

Most of the do. but as has been demonstrated here - not all

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