fscrypt_fname_siphash
EXPORT_SYMBOL_GPL(fscrypt_fname_siphash);
combined_hash = fscrypt_fname_siphash(dir, &qname);
cpu_to_le32(fscrypt_fname_siphash(dir, &tmp));
u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name);