140 struct cow {  struct
166 	struct cow cow;  member
192 	.cow =			DEFAULT_COW, \
334 	ubd_dev->cow.file = backing_file;  in ubd_setup_common()
524 	if (ubd_dev->file && ubd_dev->cow.file) {  in ubd_file_size()
525 		file = ubd_dev->cow.file;  in ubd_file_size()
593 static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)  in path_requires_switch()  argument
620 	       from_cmdline, from_cow, cow);  in path_requires_switch()
732 	if(ubd_dev->cow.file == NULL)  in ubd_close_dev()
735 	os_close_file(ubd_dev->cow.fd);  in ubd_close_dev()
736 	vfree(ubd_dev->cow.bitmap);  in ubd_close_dev()
737 	ubd_dev->cow.bitmap = NULL;  in ubd_close_dev()
749 	create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;  in ubd_open_dev()
750 	back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;  in ubd_open_dev()
753 				back_ptr, &ubd_dev->cow.bitmap_offset,  in ubd_open_dev()
754 				&ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset,  in ubd_open_dev()
758 		fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,  in ubd_open_dev()
760 					  &ubd_dev->cow.bitmap_offset,  in ubd_open_dev()
761 					  &ubd_dev->cow.bitmap_len,  in ubd_open_dev()
762 					  &ubd_dev->cow.data_offset);  in ubd_open_dev()
765 			       "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);  in ubd_open_dev()
776 	if(ubd_dev->cow.file != NULL){  in ubd_open_dev()
780 		ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);  in ubd_open_dev()
781 		if(ubd_dev->cow.bitmap == NULL){  in ubd_open_dev()
787 		err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap,  in ubd_open_dev()
788 				      ubd_dev->cow.bitmap_offset,  in ubd_open_dev()
789 				      ubd_dev->cow.bitmap_len);  in ubd_open_dev()
795 		err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,  in ubd_open_dev()
798 		ubd_dev->cow.fd = err;  in ubd_open_dev()
993 	if(ubd_dev->cow.file != NULL){  in ubd_get_config()
995 		CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);  in ubd_get_config()
1280 	if (dev->cow.file) {  in ubd_map_req()
1283 				   dev->cow.bitmap, dev->cow.bitmap_offset,  in ubd_map_req()
1284 				   dev->cow.bitmap_len);  in ubd_map_req()
1304 	if (dev->cow.file)  in ubd_alloc_req()
1305 		io_req->fds[0] = dev->cow.fd;  in ubd_alloc_req()
1313 	io_req->offsets[1] = dev->cow.data_offset;  in ubd_alloc_req()