From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Staubach <staubach@redhat.com>
Subject: Re: nfsd_rename() multiple export problem
Date: Fri, 31 Jul 2009 09:43:49 -0400
Message-ID: <4A72F515.9070006@redhat.com>
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Cc: linux-fsdevel@vger.kernel.org
To: Boris Zuckerman <boris@ibrix.com>
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Boris Zuckerman wrote:
> Hi,
>=20
> =20
>=20
> This is probably a question for Peter Staubach. However, may be someb=
ody
> else can help me too=85
>=20
> =20
>=20
> Once in a while under heavy load nfsd returns a NFSERR_XDEV from rena=
me
> checking following condition:
>=20
> =20
>=20
>       err =3D (rqstp->rq_vers =3D=3D 2) ? nfserr_acces : nfserr_xdev;
>=20
>       if (ffhp->fh_export !=3D tfhp->fh_export)
>=20
>             goto out;
>=20
> =20
>=20
> Note that several lines later the similar check looks like this:
>=20
> =20
>=20
>       host_err =3D -EXDEV;
>=20
>       if (ffhp->fh_export->ex_path.mnt !=3D tfhp->fh_export->ex_path.=
mnt)
>=20
>             goto out_dput_new;
>=20
> =20
>=20
> As you can see the code is not making any longer assumptions that
> fh_export must match, but rather is checking ex_path.mnt.
>=20
> We reproduced the problem in-house and got following information: the
> source and the target directories are the same; Ibrix resolved them t=
o
> the same dentry.
>=20
> However, there are 2 different fh_exports. I noticed that one of them
> has expiry_time =3D 0x0 and  another has expiry_time =3D 0x4a6aee6d
>=20
> Is it significant? Below is the complete dump of exports and svc_fh
> structurs. Please, let me know if you need more information.
>=20
> I have the crash dump and can dig out anything you need.
>=20

What version of the Linux kernel are you using?

	Thanx...

		ps
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