fscrypt_symlink_data
max_len - sizeof(struct fscrypt_symlink_data) - 1,
disk_link->len += sizeof(struct fscrypt_symlink_data) + 1;
struct fscrypt_symlink_data *sd;
sd = (struct fscrypt_symlink_data *)disk_link->name;
const struct fscrypt_symlink_data *sd;