NFSD_A_EXPKEY_FSID
nla_put(skb, NFSD_A_EXPKEY_FSID,
if (!tb[NFSD_A_EXPKEY_FSID]) {
fsid_len = nla_len(tb[NFSD_A_EXPKEY_FSID]);
memcpy(key.ek_fsid, nla_data(tb[NFSD_A_EXPKEY_FSID]), fsid_len);
[NFSD_A_EXPKEY_FSID] = { .type = NLA_BINARY, },