* if false, use the name and read from
* the filesystem.
*/
- unsigned file_valid : 1; /* if false the file does not exist */
+#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 */
};