int (*do_declare_xattr_set)(const struct lu_env *, struct dt_object *,
const struct lu_buf *, const char *, int,
struct thandle *);
int (*do_xattr_set)(const struct lu_env *, struct dt_object *,
const struct lu_buf *, const char *, int,
int (*do_declare_xattr_set)(const struct lu_env *, struct dt_object *,
const struct lu_buf *, const char *, int,
struct thandle *);
int (*do_xattr_set)(const struct lu_env *, struct dt_object *,
const struct lu_buf *, const char *, int,