fscrypt_get_encryption_info
ret = fscrypt_get_encryption_info(dir, lookup);
err = fscrypt_get_encryption_info(dir, true);
int fscrypt_get_encryption_info(struct inode *inode, bool allow_unsupported);
int err = fscrypt_get_encryption_info(inode, false);
int err = fscrypt_get_encryption_info(dir, true);
return fscrypt_get_encryption_info(dir, true);
err = fscrypt_get_encryption_info(inode, false);
err = fscrypt_get_encryption_info(parent, true);
err = fscrypt_get_encryption_info(child, true);