Re: [PATCH 4/8] nfsd: refactor lookup_clientid

["J. Bruce Fields" <bfields@redhat.com>]

On Wed, Jan 20, 2021 at 09:02:25PM +0000, Chuck Lever wrote:
> 
> 
> > On Jan 19, 2021, at 5:35 PM, J. Bruce Fields <bfields@redhat.com> wrote:
> > 
> > From: "J. Bruce Fields" <bfields@redhat.com>
> > 
> > I think set_client is a better name, and the lookup itself I want to
> > use somewhere else.
> 
> Should this be two patches?
> - Rename lookup_clientid() to set_client()
> - Refactor the lookup_clientid() helper

Sure.

> nfs4state.c stops compiling with this patch. See below.

Oops, thanks.

If these look OK otherwise, I can resend.

--b.

> 
> 
> > Signed-off-by: J. Bruce Fields <bfields@redhat.com>
> > ---
> > fs/nfsd/nfs4state.c | 50 ++++++++++++++++++++++-----------------------
> > 1 file changed, 24 insertions(+), 26 deletions(-)
> > 
> > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > index ba955bbf21df..d7128e16c86e 100644
> > --- a/fs/nfsd/nfs4state.c
> > +++ b/fs/nfsd/nfs4state.c
> > @@ -4633,40 +4633,40 @@ static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4
> > 	return nfserr_bad_seqid;
> > }
> > 
> > -static __be32 lookup_clientid(clientid_t *clid,
> > +static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
> > +						struct nfsd_net *nn)
> > +{
> > +	struct nfs4_client *found;
> > +
> > +	spin_lock(&nn->client_lock);
> > +	found = find_confirmed_client(clid, sessions, nn);
> > +	if (found)
> > +		atomic_inc(&found->cl_rpc_users);
> > +	spin_unlock(&nn->client_lock);
> > +	return found;
> > +}
> > +
> > +static __be32 set_client(clientid_t *clid,
> > 		struct nfsd4_compound_state *cstate,
> > 		struct nfsd_net *nn,
> > 		bool sessions)
> > {
> > -	struct nfs4_client *found;
> > -
> > 	if (cstate->clp) {
> > -		found = cstate->clp;
> > -		if (!same_clid(&found->cl_clientid, clid))
> > +		if (!same_clid(&cstate->clp->cl_clientid, clid))
> > 			return nfserr_stale_clientid;
> > 		return nfs_ok;
> > 	}
> > -
> > 	if (STALE_CLIENTID(clid, nn))
> > 		return nfserr_stale_clientid;
> > -
> > 	/*
> > 	 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
> > 	 * cached already then we know this is for is for v4.0 and "sessions"
> > 	 * will be false.
> > 	 */
> > 	WARN_ON_ONCE(cstate->session);
> > -	spin_lock(&nn->client_lock);
> > -	found = find_confirmed_client(clid, sessions, nn);
> > -	if (!found) {
> > -		spin_unlock(&nn->client_lock);
> > +	cstate->clp = lookup_clientid(clid, sessions, nn);
> > +	if (!cstate->clp)
> > 		return nfserr_expired;
> > -	}
> > -	atomic_inc(&found->cl_rpc_users);
> > -	spin_unlock(&nn->client_lock);
> > -
> > -	/* Cache the nfs4_client in cstate! */
> > -	cstate->clp = found;
> > 	return nfs_ok;
> > }
> > 
> > @@ -4688,7 +4688,7 @@ nfsd4_process_open1(struct nfsd4_compound_state *cstate,
> > 	if (open->op_file == NULL)
> > 		return nfserr_jukebox;
> > 
> > -	status = lookup_clientid(clientid, cstate, nn, false);
> > +	status = set_client(clientid, cstate, nn, false);
> > 	if (status)
> > 		return status;
> > 	clp = cstate->clp;
> > @@ -5298,7 +5298,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> > 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
> > 
> > 	trace_nfsd_clid_renew(clid);
> > -	status = lookup_clientid(clid, cstate, nn, false);
> > +	status = set_client(clid, cstate, nn, false);
> > 	if (status)
> > 		return status;
> > 	clp = cstate->clp;
> > @@ -5681,8 +5681,7 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
> > 	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
> > 		CLOSE_STATEID(stateid))
> > 		return nfserr_bad_stateid;
> > -	status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn,
> > -				 false);
> > +	status = set_client(&stateid->si_opaque.so_clid, cstate, nn, false);
> > 	if (status == nfserr_stale_clientid) {
> > 		if (cstate->session)
> > 			return nfserr_bad_stateid;
> > @@ -5821,7 +5820,7 @@ static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
> > 
> > 	cps->cpntf_time = ktime_get_boottime_seconds();
> > 	memset(&cstate, 0, sizeof(cstate));
> > -	status = lookup_clientid(&cps->cp_p_clid, &cstate, nn, true);
> > +	status = set_clientid(&cps->cp_p_clid, &cstate, nn, true);
> 
> This doesn't compile. I think you meant set_client() here.
> 
> 
> > 	if (status)
> > 		goto out;
> > 	status = nfsd4_lookup_stateid(&cstate, &cps->cp_p_stateid,
> > @@ -6900,8 +6899,7 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> > 		 return nfserr_inval;
> > 
> > 	if (!nfsd4_has_session(cstate)) {
> > -		status = lookup_clientid(&lockt->lt_clientid, cstate, nn,
> > -					 false);
> > +		status = set_client(&lockt->lt_clientid, cstate, nn, false);
> > 		if (status)
> > 			goto out;
> > 	}
> > @@ -7085,7 +7083,7 @@ nfsd4_release_lockowner(struct svc_rqst *rqstp,
> > 	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
> > 		clid->cl_boot, clid->cl_id);
> > 
> > -	status = lookup_clientid(clid, cstate, nn, false);
> > +	status = set_client(clid, cstate, nn, false);
> > 	if (status)
> > 		return status;
> > 
> > @@ -7232,7 +7230,7 @@ nfs4_check_open_reclaim(clientid_t *clid,
> > 	__be32 status;
> > 
> > 	/* find clientid in conf_id_hashtbl */
> > -	status = lookup_clientid(clid, cstate, nn, false);
> > +	status = set_clientid(clid, cstate, nn, false);
> 
> Ditto.
> 
> 
> > 	if (status)
> > 		return nfserr_reclaim_bad;
> > 
> > -- 
> > 2.29.2
> > 
> 
> --
> Chuck Lever
> 
> 
>