report error first

weed/filesys/filehandle.go

@@ -68,14 +68,14 @@ func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fus
 		totalRead = max(maxStop - req.Offset, totalRead)
 	}
 
-	totalRead = min(int64(len(buff)), totalRead)
-	resp.Data = buff[:totalRead]
-
 	if err != nil {
 		glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err)
 		return fuse.EIO
 	}
 
+	totalRead = min(int64(len(buff)), totalRead)
+	resp.Data = buff[:totalRead]
+
 	return err
 }