[lib][bcache] add a simple block device cache
diff --git a/lib/bcache/rules.mk b/lib/bcache/rules.mk
new file mode 100644
index 0000000..9927f1b
--- /dev/null
+++ b/lib/bcache/rules.mk
@@ -0,0 +1,6 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULES += lib/bio
+
+OBJS += \
+	$(LOCAL_DIR)/bcache.o