More efficient retrieval of file size

include/grub/archelp.h

@@ -40,7 +40,8 @@ struct grub_archelp_ops
   grub_err_t
   (*find_file) (struct grub_archelp_data *data, char **name,
 		grub_int32_t *mtime,
-		grub_archelp_mode_t *mode);
+		grub_archelp_mode_t *mode,
+		grub_uint64_t *size);
 
   char *
   (*get_link_target) (struct grub_archelp_data *data);

include/grub/fs.h

@@ -39,6 +39,7 @@ struct grub_dirhook_info
   unsigned mtimeset:1;
   unsigned case_insensitive:1;
   grub_int32_t mtime;
+  grub_off_t size;
 };
 
 typedef int (*grub_fs_dir_hook_t) (const char *filename,