+void bch2_fs_btree_cache_exit(struct bch_fs *);
+int bch2_fs_btree_cache_init(struct bch_fs *);
+void bch2_fs_btree_cache_init_early(struct btree_cache *);
+
+static inline u64 btree_ptr_hash_val(const struct bkey_i *k)
+{
+ switch (k->k.type) {
+ case KEY_TYPE_btree_ptr:
+ return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start);
+ case KEY_TYPE_btree_ptr_v2:
+ return bkey_i_to_btree_ptr_v2_c(k)->v.seq;
+ default:
+ return 0;
+ }
+}
+
+static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k)
+{
+ return k->k.type == KEY_TYPE_btree_ptr_v2
+ ? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr
+ : NULL;
+}
+
+/* is btree node in hash table? */
+static inline bool btree_node_hashed(struct btree *b)
+{
+ return b->hash_val != 0;
+}