linux-kernel - Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

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Date:	Wed, 27 Jul 2011 13:45:37 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Ruediger Meier <sweet_f_a@....de>,
	Bryan Schumaker <bjschuma@...app.com>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

On Wed, Jul 27, 2011 at 01:17:35PM -0400, Justin Piszcz wrote:
> 
> 
> On Wed, 27 Jul 2011, Ruediger Meier wrote:
> 
> >On Wednesday 27 July 2011, Bryan Schumaker wrote:
> >>On 07/27/2011 12:28 PM, Justin Piszcz wrote:
> >>>On Wed, 27 Jul 2011, J. Bruce Fields wrote:
> >>>>
> >>>>What filesystem on the server are you exporting?
> >>>
> >>>xfs.
> >>>/dev/sda1 on / type xfs (rw,noatime)
> >>>
> >>>Nothing special, thoughts?
> >>
> >>Are there a lot of files in the directory you're exporting?  It looks
> >>like cookie 10272 is mapped to multiple files.
> >
> >I thought xfs is immune to readdir loops!?
> >Is your export directory really located directly within / on /dev/sda1?
> 
> Hi,
> 
> I was sharing out a directory on the NFS server:
> /d1         192.168.0.0/24(async,rw,no_root_squash,no_subtree_check,fsid=1)
> 
> Should I share out / instead?

You can do that if you want, but note that anyone malicious on that
network can get access to / by guessing filehandles.  (Safer would be to
mount a separate partition at /d1.)

But in any case that's got nothing to do with readdir cookie problems.

--b.

> Is this a known problem?
> 
> $ df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1              30G   13G   18G  43% /
> tmpfs                 2.0G  8.0K  2.0G   1% /lib/init/rw
> udev                   10M  192K  9.9M   2% /dev
> tmpfs                 2.0G     0  2.0G   0% /dev/shm
> $
> 
> Justin.
> 
> 
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