nfs4_try_failover
if (nfs4_try_failover(ep)) {
if (nfs4_try_failover(&e) == 0 && e.stat != NFS4ERR_STALE) {
(nfs4_try_failover(&n4e) ||
try_f = nfs4_try_failover(&recovp->rc_orig_errors) &&
if (FAILOVER_MOUNT4(mi) && nfs4_try_failover(n4ep)) {
extern int nfs4_try_failover(nfs4_error_t *);