NFSD_A_SVC_EXPORT_FLAGS
if (tb[NFSD_A_SVC_EXPORT_FLAGS])
exp.ex_flags = nla_get_u32(tb[NFSD_A_SVC_EXPORT_FLAGS]);
[NFSD_A_SVC_EXPORT_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x3ffff),