diff --git a/authfs/fd_server/src/main.rs b/authfs/fd_server/src/main.rs
index 99b6e9e..d35feb1 100644
--- a/authfs/fd_server/src/main.rs
+++ b/authfs/fd_server/src/main.rs
@@ -209,6 +209,24 @@
             }
         }
     }
+
+    fn resize(&self, id: i32, size: i64) -> BinderResult<()> {
+        match &self.get_file_config(id)? {
+            FdConfig::Readonly { .. } => Err(StatusCode::INVALID_OPERATION.into()),
+            FdConfig::ReadWrite(file) => {
+                if size < 0 {
+                    return Err(new_binder_exception(
+                        ExceptionCode::ILLEGAL_ARGUMENT,
+                        "Invalid size to resize to",
+                    ));
+                }
+                file.set_len(size as u64).map_err(|e| {
+                    error!("resize: set_len error: {}", e);
+                    Status::from(ERROR_IO)
+                })
+            }
+        }
+    }
 }
 
 fn read_into_buf(file: &File, max_size: usize, offset: u64) -> io::Result<Vec<u8>> {