save path for later use

src/rocksdb.rs

@@ -30,6 +30,7 @@ const DEFAULT_COLUMN_FAMILY: &'static str = "default";
 pub struct DB {
     inner: rocksdb_ffi::DBInstance,
     cfs: BTreeMap<String, DBCFHandle>,
+    path: String,
 }
 
 unsafe impl Send for DB {}
@@ -373,6 +374,7 @@ impl DB {
         Ok(DB {
             inner: db,
             cfs: cf_map,
+            path: path.to_owned(),
         })
     }
 
@@ -410,6 +412,10 @@ impl DB {
         Ok(())
     }
 
+    pub fn path(&self) -> &str {
+        &self.path
+    }
+
     pub fn write_opt(&self,
                      batch: WriteBatch,
                      writeopts: &WriteOptions)