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Message-ID: <b2f720cb8993fbf0072a3d02434214c5f3b613fa.camel@kernel.org>
Subject: Re: [PATCH 1/3] nfsd: move nfsd4_cstate_assign_replay() earlier in
 open handling.
From: Jeff Layton <jlayton@kernel.org>
To: NeilBrown <neilb@suse.de>, Chuck Lever <chuck.lever@oracle.com>
Cc: linux-nfs@vger.kernel.org, Olga Kornievskaia <kolga@netapp.com>, Dai Ngo
	 <Dai.Ngo@oracle.com>, Tom Talpey <tom@talpey.com>
Date: Fri, 01 Mar 2024 07:54:39 -0500
In-Reply-To: <20240301000950.2306-2-neilb@suse.de>
References: <20240301000950.2306-1-neilb@suse.de>
	 <20240301000950.2306-2-neilb@suse.de>
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On Fri, 2024-03-01 at 11:07 +1100, NeilBrown wrote:
> Rather than taking the rp_mutex in nfsd4_cleanup_open_state() (which
> seems counter-intuitive), take it and assign rp_owner as soon as
> possible.
>=20
> This will support a future change when nfsd4_cstate_assign_replay() might
> fail.
>=20
> Signed-off-by: NeilBrown <neilb@suse.de>
> ---
>  fs/nfsd/nfs4state.c | 13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)
>=20
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 7d6c657e0409..e625f738f7b0 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -5066,15 +5066,15 @@ nfsd4_process_open1(struct nfsd4_compound_state *=
cstate,
>  	strhashval =3D ownerstr_hashval(&open->op_owner);
>  	oo =3D find_openstateowner_str(strhashval, open, clp);
>  	open->op_openowner =3D oo;
> -	if (!oo) {
> +	if (!oo)
>  		goto new_owner;
> -	}
>  	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
>  		/* Replace unconfirmed owners without checking for replay. */
>  		release_openowner(oo);
>  		open->op_openowner =3D NULL;
>  		goto new_owner;
>  	}
> +	nfsd4_cstate_assign_replay(cstate, &oo->oo_owner);
>  	status =3D nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
>  	if (status)
>  		return status;
> @@ -5084,6 +5084,7 @@ nfsd4_process_open1(struct nfsd4_compound_state *cs=
tate,
>  	if (oo =3D=3D NULL)
>  		return nfserr_jukebox;
>  	open->op_openowner =3D oo;
> +	nfsd4_cstate_assign_replay(cstate, &oo->oo_owner);
>  alloc_stateid:
>  	open->op_stp =3D nfs4_alloc_open_stateid(clp);
>  	if (!open->op_stp)
> @@ -5835,12 +5836,8 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct=
 svc_fh *current_fh, struct nf
>  void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
>  			      struct nfsd4_open *open)
>  {
> -	if (open->op_openowner) {
> -		struct nfs4_stateowner *so =3D &open->op_openowner->oo_owner;
> -
> -		nfsd4_cstate_assign_replay(cstate, so);
> -		nfs4_put_stateowner(so);
> -	}
> +	if (cstate->replay_owner)
> +		nfs4_put_stateowner(cstate->replay_owner);

The above delta doesn't look right. The replay_owner won't be set on
v4.1+ mounts, but op_openowner will still hold a valid reference that
will now leak.

>  	if (open->op_file)
>  		kmem_cache_free(file_slab, open->op_file);
>  	if (open->op_stp)

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