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Message-ID: <5d6688d419f19512a8170ca915ec5825df8f489a.camel@kernel.org>
Subject: Re: [PATCH RFC 11/24] nfsd: allow DELEGRETURN on directories
From: Jeff Layton <jlayton@kernel.org>
To: Trond Myklebust <trondmy@hammerspace.com>, "chuck.lever@oracle.com"
	 <chuck.lever@oracle.com>
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Date: Mon, 18 Mar 2024 07:22:04 -0400
In-Reply-To: <d3d8483b1248e4bccadb8591019dbe7c4aeb3d1c.camel@hammerspace.com>
References: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org>
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On Sun, 2024-03-17 at 16:03 +0000, Trond Myklebust wrote:
> On Sun, 2024-03-17 at 11:09 -0400, Chuck Lever wrote:
> > On Fri, Mar 15, 2024 at 12:53:02PM -0400, Jeff Layton wrote:
> > > fh_verify only allows you to filter on a single type of inode, so
> > > have
> > > nfsd4_delegreturn not filter by type. Once fh_verify returns, do
> > > the
> > > appropriate check of the type and return an error if it's not a
> > > regular
> > > file or directory.
> > >=20
> > > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > > ---
> > > =A0fs/nfsd/nfs4state.c | 14 +++++++++++++-
> > > =A01 file changed, 13 insertions(+), 1 deletion(-)
> > >=20
> > > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > > index 17d09d72632b..c52e807f9672 100644
> > > --- a/fs/nfsd/nfs4state.c
> > > +++ b/fs/nfsd/nfs4state.c
> > > @@ -7425,12 +7425,24 @@ nfsd4_delegreturn(struct svc_rqst *rqstp,
> > > struct nfsd4_compound_state *cstate,
> > > =A0	struct nfs4_delegation *dp;
> > > =A0	stateid_t *stateid =3D &dr->dr_stateid;
> > > =A0	struct nfs4_stid *s;
> > > +	umode_t mode;
> > > =A0	__be32 status;
> > > =A0	struct nfsd_net *nn =3D net_generic(SVC_NET(rqstp),
> > > nfsd_net_id);
> > > =A0
> > > -	if ((status =3D fh_verify(rqstp, &cstate->current_fh,
> > > S_IFREG, 0)))
> > > +	if ((status =3D fh_verify(rqstp, &cstate->current_fh, 0,
> > > 0)))
> > > =A0		return status;
> > > =A0
> > > +	mode =3D d_inode(cstate->current_fh.fh_dentry)->i_mode &
> > > S_IFMT;
> > > +	switch(mode) {
> > > +	case S_IFREG:
> > > +	case S_IFDIR:
> > > +		break;
> > > +	case S_IFLNK:
> > > +		return nfserr_symlink;
> > > +	default:
> > > +		return nfserr_inval;
> > > +	}
> > > +
> >=20
> > RFC 8881 Section 15.2 does not list NFS4ERR_SYMLINK among the
> > valid status codes for the DELEGRETURN operation. Maybe the naked
> > fh_verify() call has gotten it wrong all these years...?
>=20
> The WANT_DELEGATION operation allows the server to hand out delegations
> for aggressive caching of symlinks. It is not an error to return that
> delegation using DELEGRETURN.
>=20
> Furthermore, provided that the presented stateid is actually valid, it
> is also sufficient to uniquely identify the file to which it is
> associated (see RFC8881 Section 8.2.4), so the filehandle should be
> considered mostly irrelevant for operations like DELEGRETURN.
>=20

Ok. I think we can probably just drop the switch altogether. We already
don't validate that the stateid is associated with current_fh, AFAICT.
It looks possible to send a valid stateid alongside an FH that refers to
a completely different file, and we'll just accept it.

--=20
Jeff Layton <jlayton@kernel.org>