ksud: determine modules's size by checking partion size

userspace/ksud/src/module.rs

@@ -375,7 +375,8 @@ fn _install_module(zip: &str) -> Result<()> {
         humansize::format_size(zip_uncompressed_size, humansize::DECIMAL)
     );
 
-    let sparse_image_size = 1 << 40; // 1T
+    let data_vfs = fs4::statvfs("/data").with_context(|| "Failed to stat /data".to_string())?;
+    let sparse_image_size = data_vfs.total_space();
     if !modules_img_exist && !modules_update_img_exist {
         // if no modules and modules_update, it is brand new installation, we should create a new img
         // create a tmp module img and mount it to modules_update