nfs_map_name_to_uid
if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
int nfs_map_name_to_uid(const struct nfs_server *, const char *, size_t, kuid_t *);
if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)