linux-kernel - Re: If not readdir() then what?

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Message-ID: <17947.65165.569482.976343@notabene.brown>
Date:	Wed, 11 Apr 2007 07:15:57 +1000
From:	Neil Brown <neilb@...e.de>
To:	Jörn Engel <joern@...ybastard.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Hellwig <hch@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Ulrich Drepper <drepper@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: If not readdir() then what?

On Sunday April 8, joern@...ybastard.org wrote:
> On Sun, 8 April 2007 11:11:20 -0700, H. Peter Anvin wrote:
> > 
> > Well, the question is if you can keep the seekdir/telldir cookie around 
> > as a pointer -- preferrably in userspace, of course.  You would 
> > presumably garbage-collect them on closedir() -- there is no other point 
> > at which you could.
> 
> Garbage-collecting them on closedir() does not work.  It surprised me as
> well, but there seem to be applications that keep the telldir() cookie
> around after closedir().  Iirc, "rm -r" was one of them.
> 
> Neil, is this correct?

It's just NFS.  nfsd does open/getdents/close on every readdir
request.
"rm -r" is the application that tends to detect any problems with
cookie handling between the NFS client and server.

(I'm sure there was once an 'rm -r' that used telldir/seekdir, but I
cannot find it.  Maybe it was level-7 UNIX :-)

NeilBrown
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