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

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Date:	Wed, 11 Apr 2007 15:57:54 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Neil Brown <neilb@...e.de>
cc:	Jörn Engel <joern@...ybastard.org>,
	"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 Apr 11 2007 07:15, Neil Brown wrote:
>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.

Uhoh, that sounds even more expensive than doing one getdent during opendir.



Jan
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