NFS: Implement support for NFS4ERR_LEASE_MOVED

Trigger lease-moved recovery when a request returns
NFS4ERR_LEASE_MOVED.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -389,6 +389,9 @@ static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struc
 			if (ret < 0)
 				break;
 			goto wait_on_recovery;
+		case -NFS4ERR_LEASE_MOVED:
+			nfs4_schedule_lease_moved_recovery(clp);
+			goto wait_on_recovery;
 #if defined(CONFIG_NFS_V4_1)
 		case -NFS4ERR_BADSESSION:
 		case -NFS4ERR_BADSLOT:
@@ -1578,6 +1581,9 @@ static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct
 		case -NFS4ERR_MOVED:
 			nfs4_schedule_migration_recovery(server);
 			return -EAGAIN;
+		case -NFS4ERR_LEASE_MOVED:
+			nfs4_schedule_lease_moved_recovery(server->nfs_client);
+			return -EAGAIN;
 		case -NFS4ERR_DELEG_REVOKED:
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_BAD_STATEID:
@@ -4758,6 +4764,9 @@ nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
 			if (nfs4_schedule_migration_recovery(server) < 0)
 				goto recovery_failed;
 			goto wait_on_recovery;
+		case -NFS4ERR_LEASE_MOVED:
+			nfs4_schedule_lease_moved_recovery(clp);
+			goto wait_on_recovery;
 #if defined(CONFIG_NFS_V4_1)
 		case -NFS4ERR_BADSESSION:
 		case -NFS4ERR_BADSLOT: