linux-kernel - Re: [PATCH 00/10] sysfs tagged directories

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Message-ID: <20080501210550.GA22534@sergelap.austin.ibm.com>
Date:	Thu, 1 May 2008 16:05:50 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>, Greg KH <gregkh@...e.de>,
	Benjamin Thery <benjamin.thery@...l.net>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Tejun Heo <htejun@...il.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/10] sysfs tagged directories

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> "Serge E. Hallyn" <serue@...ibm.com> writes:
> 
> > Quoting Greg KH (gregkh@...e.de):
> > Now before moving veth1 to the new netns, we have in the container:
> > /sys/class/net:
> > lo  sit0
> >
> > /sys/devices/virtual/net:
> > lo  sit0
> >
> > and after moving veth1, we have in the container:
> >
> > /sys/class/net:
> > lo  sit0  veth1
> >
> > /sys/devices/virtual/net:
> > lo  sit0
> >
> > In the parent network namespace, veth1 is removed from /sys/class/net
> > but remains in /sys/devices/virtual/net.
> 
> The symlink is gone by the real directory remains?
> 
> > I'm not sure whether this is the renaming bug that Daniel Lezcano's
> > patch addresses.  If not (as I suspect) then that clearly needs to be
> > fixed.
> >
> > Benjamin can you play around with this and test it with Daniel's
> > patch?
> 
> Darn.  It appears we have a regression in this patchset.
> That part used to work.
> 
> I was thinking of blaming sysfs_rename_link.  But it the
> links are fine so it looks more likely that sysfs has morphed once
> again and we have  a reference counting issue or something similar.
> Yuck. d_move and the other moves should have worked.
> 
> >From a purely get the good less controversial parts of this
> patchset in.  I suggest we look at patches 7/10 and 8/10 (without
> the tag_ops).  And introduce and start using sysfs_delete_link
> and sysfs_rename_link.  That code seems pretty stable and is
> generally a code reduction all by itself by reducing a common
> idiom into a single function.
> 
> Eric

Ok as it turns out Benjamin Thery does in fact have a patch to fix this.
Benjamin, please send your renaming patch out tomorrow if you can?

I guess this is why I didn't really see the problem Benjamin said there
was - it just works with SYSFS_DEPRECATED  :)

-serge
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