refactor

weed/filesys/page_writer.go

@@ -92,3 +92,16 @@ func (pw *PageWriter) GetStorageOptions() (collection, replication string) {
 func (pw *PageWriter) Destroy() {
 	pw.randomWriter.Destroy()
 }
+
+func max(x, y int64) int64 {
+	if x > y {
+		return x
+	}
+	return y
+}
+func min(x, y int64) int64 {
+	if x < y {
+		return x
+	}
+	return y
+}