um/drivers/ubd_kern.c

232 	char *file, *backing_file, *serial;
310 	backing_file = strsep(&str, ",:");
311 	if (backing_file && *backing_file == '\0')
312 		backing_file = NULL;
318 	if (backing_file && ubd_dev->no_cow) {
325 	ubd_dev->cow.file = backing_file;
509 	char *backing_file;
525 	err = read_cow_header(file_reader, &fd, &version, &backing_file, \
532 		file = backing_file;
623 	char *backing_file;
654 	err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
664 	asked_switch = path_requires_switch(*backing_file_out, backing_file,
679 		*backing_file_out = backing_file;
694 static int create_cow_file(char *cow_file, char *backing_file,
710 	err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,