struct btr_pool *btr_pool_new(const char *name, size_t area_size);
void btr_pool_free(struct btr_pool *btrp);
size_t btr_pool_get_buffer(struct btr_pool *btrp, char **result);
+int btr_pool_get_buffers(struct btr_pool *btrp, struct iovec iov[2]);
void btr_add_output_pool(struct btr_pool *btrp, size_t size,
struct btr_node *btrn);
size_t btr_pool_unused(struct btr_pool *btrp);
void *btr_context(struct btr_node *btrn);
void btr_merge(struct btr_node *btrn, size_t dest_size);
void btr_log_tree(struct btr_node *btrn, int loglevel);
-int btr_pushdown_one(struct btr_node *btrn);
+void btr_pushdown_one(struct btr_node *btrn);
bool btr_inplace_ok(struct btr_node *btrn);
int btr_node_status(struct btr_node *btrn, size_t min_iqs,
enum btr_node_type type);