__aa_findn_ns
ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
return __aa_findn_ns(head, name, strlen(name));
ns = __aa_findn_ns(&ns->sub_ns, hname, split - hname);
return __aa_findn_ns(&ns->sub_ns, hname, n);