address comments

src/rocksdb.rs

@@ -442,7 +442,7 @@ impl DB {
 
     pub fn write_withou_wal(&self, batch: WriteBatch) -> Result<(), String> {
         let mut wo = WriteOptions::new();
-        wo.disable_wal();
+        wo.disable_wal(true);
         self.write_opt(batch, &wo)
     }
 

src/rocksdb_options.rs

@@ -384,9 +384,13 @@ impl WriteOptions {
         }
     }
 
-    pub fn disable_wal(&mut self) {
+    pub fn disable_wal(&mut self, disable: bool) {
         unsafe {
+            if disable {
                 rocksdb_ffi::rocksdb_writeoptions_disable_WAL(self.inner, 1);
+            } else {
+                rocksdb_ffi::rocksdb_writeoptions_disable_WAL(self.inner, 0);
+            }
         }
     }
 }