nfsd4: allow destroy_session over destroyed session

RFC 5661 allows a client to destroy a session using a compound
associated with the destroyed session, as long as the DESTROY_SESSION op
is the last op of the compound.

We attempt to allow this, but testing against a Solaris client (which
does destroy sessions in this way) showed that we were failing the
DESTROY_SESSION with NFS4ERR_DELAY, because we assumed the reference
count on the session (held by us) represented another rpc in progress
over this session.

Fix this by noting that in this case the expected reference count is 1,
not 0.

Also, note as long as the session holds a reference to the compound
we're destroying, we can't free it here--instead, delay the free till
the final put in nfs4svc_encode_compoundres.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c102d25..0c0f3ea9 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3760,13 +3760,17 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo
 	iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
 	BUG_ON(iov->iov_len > PAGE_SIZE);
 	if (nfsd4_has_session(cs)) {
+		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+		struct nfs4_client *clp = cs->session->se_client;
 		if (cs->status != nfserr_replay_cache) {
 			nfsd4_store_cache_entry(resp);
 			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
 		}
 		/* Renew the clientid on success and on replay */
-		put_client_renew(cs->session->se_client);
+		spin_lock(&nn->client_lock);
 		nfsd4_put_session(cs->session);
+		spin_unlock(&nn->client_lock);
+		put_client_renew(clp);
 	}
 	return 1;
 }