nfs4: V2 return/expire delegations depending on their type

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/delegation.c

@@ -385,27 +385,41 @@ void nfs_super_return_all_delegations(struct super_block *sb)
 		nfs4_schedule_state_manager(clp);
 }
 
-static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
+static
+void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, fmode_t flags)
 {
 	struct nfs_delegation *delegation;
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
-		nfs_mark_return_delegation(clp, delegation);
+		if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
+			continue;
+		if (delegation->type & flags)
+			nfs_mark_return_delegation(clp, delegation);
 	}
 	rcu_read_unlock();
 }
 
+static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
+{
+	nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
+}
+
 static void nfs_delegation_run_state_manager(struct nfs_client *clp)
 {
 	if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
 		nfs4_schedule_state_manager(clp);
 }
 
+static void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags)
+{
+	nfs_client_mark_return_all_delegation_types(clp, flags);
+	nfs_delegation_run_state_manager(clp);
+}
+
 void nfs_expire_all_delegations(struct nfs_client *clp)
 {
-	nfs_client_mark_return_all_delegations(clp);
-	nfs_delegation_run_state_manager(clp);
+	nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
 }
 
 /*