1 files changed, 126 insertions, 83 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8e83cef4d0bd..3b4ce41c9db8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -113,6 +113,90 @@ nfs4_unlock_state(void)
 	mutex_unlock(&client_mutex);
 }
 
+static bool is_client_expired(struct nfs4_client *clp)
+{
+	return clp->cl_time == 0;
+}
+
+static __be32 mark_client_expired_locked(struct nfs4_client *clp)
+{
+	if (atomic_read(&clp->cl_refcount))
+		return nfserr_jukebox;
+	clp->cl_time = 0;
+	return nfs_ok;
+}
+
+static __be32 mark_client_expired(struct nfs4_client *clp)
+{
+	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+	__be32 ret;
+
+	spin_lock(&nn->client_lock);
+	ret = mark_client_expired_locked(clp);
+	spin_unlock(&nn->client_lock);
+	return ret;
+}
+
+static __be32 get_client_locked(struct nfs4_client *clp)
+{
+	if (is_client_expired(clp))
+		return nfserr_expired;
+	atomic_inc(&clp->cl_refcount);
+	return nfs_ok;
+}
+
+/* must be called under the client_lock */
+static inline void
+renew_client_locked(struct nfs4_client *clp)
+{
+	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+	if (is_client_expired(clp)) {
+		WARN_ON(1);
+		printk("%s: client (clientid %08x/%08x) already expired\n",
+			__func__,
+			clp->cl_clientid.cl_boot,
+			clp->cl_clientid.cl_id);
+		return;
+	}
+
+	dprintk("renewing client (clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot,
+			clp->cl_clientid.cl_id);
+	list_move_tail(&clp->cl_lru, &nn->client_lru);
+	clp->cl_time = get_seconds();
+}
+
+static inline void
+renew_client(struct nfs4_client *clp)
+{
+	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+	spin_lock(&nn->client_lock);
+	renew_client_locked(clp);
+	spin_unlock(&nn->client_lock);
+}
+
+void put_client_renew_locked(struct nfs4_client *clp)
+{
+	if (!atomic_dec_and_test(&clp->cl_refcount))
+		return;
+	if (!is_client_expired(clp))
+		renew_client_locked(clp);
+}
+
+void put_client_renew(struct nfs4_client *clp)
+{
+	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+	if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
+		return;
+	if (!is_client_expired(clp))
+		renew_client_locked(clp);
+	spin_unlock(&nn->client_lock);
+}
+
+
 static inline u32
 opaque_hashval(const void *ptr, int nbytes)
 {
@@ -864,7 +948,7 @@ static void free_session(struct kref *kref)
 	__free_session(ses);
 }
 
-static void nfsd4_put_session(struct nfsd4_session *ses)
+void nfsd4_put_session(struct nfsd4_session *ses)
 {
 	struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
 
@@ -968,38 +1052,6 @@ unhash_session(struct nfsd4_session *ses)
 	spin_unlock(&ses->se_client->cl_lock);
 }
 
-/* must be called under the client_lock */
-static inline void
-renew_client_locked(struct nfs4_client *clp)
-{
-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
-	if (is_client_expired(clp)) {
-		WARN_ON(1);
-		printk("%s: client (clientid %08x/%08x) already expired\n",
-			__func__,
-			clp->cl_clientid.cl_boot,
-			clp->cl_clientid.cl_id);
-		return;
-	}
-
-	dprintk("renewing client (clientid %08x/%08x)\n", 
-			clp->cl_clientid.cl_boot, 
-			clp->cl_clientid.cl_id);
-	list_move_tail(&clp->cl_lru, &nn->client_lru);
-	clp->cl_time = get_seconds();
-}
-
-static inline void
-renew_client(struct nfs4_client *clp)
-{
-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
-	spin_lock(&nn->client_lock);
-	renew_client_locked(clp);
-	spin_unlock(&nn->client_lock);
-}
-
 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
 static int
 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
@@ -1051,33 +1103,12 @@ free_client(struct nfs4_client *clp)
 	kfree(clp);
 }
 
-void
-release_session_client(struct nfsd4_session *session)
-{
-	struct nfs4_client *clp = session->se_client;
-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
-	nfsd4_put_session(session);
-	if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
-		return;
-	/*
-	 * At this point we also know all sessions have refcnt 1,
-	 * so free_client will delete them all if necessary:
-	 */
-	if (is_client_expired(clp))
-		free_client(clp);
-	else
-		renew_client_locked(clp);
-	spin_unlock(&nn->client_lock);
-}
-
 /* must be called under the client_lock */
 static inline void
 unhash_client_locked(struct nfs4_client *clp)
 {
 	struct nfsd4_session *ses;
 
-	mark_client_expired(clp);
 	list_del(&clp->cl_lru);
 	spin_lock(&clp->cl_lock);
 	list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
@@ -1119,8 +1150,8 @@ destroy_client(struct nfs4_client *clp)
 		rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
 	spin_lock(&nn->client_lock);
 	unhash_client_locked(clp);
-	if (atomic_read(&clp->cl_refcount) == 0)
-		free_client(clp);
+	WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
+	free_client(clp);
 	spin_unlock(&nn->client_lock);
 }
 
@@ -1815,8 +1846,12 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 			goto out_free_conn;
 		}
 		old = find_confirmed_client_by_name(&unconf->cl_name, nn);
-		if (old)
+		if (old) {
+			status = mark_client_expired(old);
+			if (status)
+				goto out_free_conn;
 			expire_client(old);
+		}
 		move_to_confirmed(unconf);
 		conf = unconf;
 	} else {
@@ -2014,6 +2049,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 {
 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
 	struct nfsd4_session *session;
+	struct nfs4_client *clp;
 	struct nfsd4_slot *slot;
 	struct nfsd4_conn *conn;
 	__be32 status;
@@ -2034,19 +2070,23 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 	status = nfserr_badsession;
 	session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
 	if (!session)
-		goto out;
+		goto out_no_session;
+	clp = session->se_client;
+	status = get_client_locked(clp);
+	if (status)
+		goto out_no_session;
 
 	status = nfserr_too_many_ops;
 	if (nfsd4_session_too_many_ops(rqstp, session))
-		goto out;
+		goto out_put_client;
 
 	status = nfserr_req_too_big;
 	if (nfsd4_request_too_big(rqstp, session))
-		goto out;
+		goto out_put_client;
 
 	status = nfserr_badslot;
 	if (seq->slotid >= session->se_fchannel.maxreqs)
-		goto out;
+		goto out_put_client;
 
 	slot = session->se_slots[seq->slotid];
 	dprintk("%s: slotid %d\n", __func__, seq->slotid);
@@ -2061,7 +2101,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 	if (status == nfserr_replay_cache) {
 		status = nfserr_seq_misordered;
 		if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
-			goto out;
+			goto out_put_client;
 		cstate->slot = slot;
 		cstate->session = session;
 		/* Return the cached reply status and set cstate->status
@@ -2071,7 +2111,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 		goto out;
 	}
 	if (status)
-		goto out;
+		goto out_put_client;
 
 	nfsd4_sequence_check_conn(conn, session);
 	conn = NULL;
@@ -2088,26 +2128,24 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 	cstate->session = session;
 
 out:
-	/* Hold a session reference until done processing the compound. */
-	if (cstate->session) {
-		struct nfs4_client *clp = session->se_client;
-
-		nfsd4_get_session(cstate->session);
-		atomic_inc(&clp->cl_refcount);
-		switch (clp->cl_cb_state) {
-		case NFSD4_CB_DOWN:
-			seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
-			break;
-		case NFSD4_CB_FAULT:
-			seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
-			break;
-		default:
-			seq->status_flags = 0;
-		}
+	nfsd4_get_session(cstate->session);
+	switch (clp->cl_cb_state) {
+	case NFSD4_CB_DOWN:
+		seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
+		break;
+	case NFSD4_CB_FAULT:
+		seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
+		break;
+	default:
+		seq->status_flags = 0;
 	}
+out_no_session:
 	kfree(conn);
 	spin_unlock(&nn->client_lock);
 	return status;
+out_put_client:
+	put_client_renew_locked(clp);
+	goto out_no_session;
 }
 
 __be32
@@ -2276,8 +2314,12 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 		expire_client(unconf);
 	} else { /* case 3: normal case; new or rebooted client */
 		conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
-		if (conf)
+		if (conf) {
+			status = mark_client_expired(conf);
+			if (status)
+				goto out;
 			expire_client(conf);
+		}
 		move_to_confirmed(unconf);
 		nfsd4_probe_callback(unconf);
 	}
@@ -3189,13 +3231,12 @@ nfs4_laundromat(struct nfsd_net *nn)
 				clientid_val = t;
 			break;
 		}
-		if (atomic_read(&clp->cl_refcount)) {
+		if (mark_client_expired_locked(clp)) {
 			dprintk("NFSD: client in use (clientid %08x)\n",
 				clp->cl_clientid.cl_id);
 			continue;
 		}
-		unhash_client_locked(clp);
-		list_add(&clp->cl_lru, &reaplist);
+		list_move(&clp->cl_lru, &reaplist);
 	}
 	spin_unlock(&nn->client_lock);
 	list_for_each_safe(pos, next, &reaplist) {
@@ -4581,6 +4622,8 @@ nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
 
 u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
 {
+	if (mark_client_expired(clp))
+		return 0;
 	expire_client(clp);
 	return 1;
 }