int out_read_pack(const struct lu_env *env, struct object_update *update,
size_t *max_update_length, const struct lu_fid *fid,
size_t size, loff_t pos);
int out_read_pack(const struct lu_env *env, struct object_update *update,
size_t *max_update_length, const struct lu_fid *fid,
size_t size, loff_t pos);