#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
unsigned should_free : 1; /* data should be free()'ed */
unsigned should_munmap : 1; /* data should be munmap()'ed */
+ unsigned dirty_submodule : 1; /* For submodules: its work tree is dirty */
struct userdiff_driver *driver;
/* data should be considered "binary"; -1 means "don't know yet" */