osfmk/vm/vm_map.c

6222 	vm_map_size_t	head_size, tail_size;
6229 	tail_size = 0;
6280 		tail_size = (copy->offset + copy->size) & PAGE_MASK;
6281 		tail_addr = dst_addr + copy->size - tail_size;
6284 	if (head_size + tail_size == copy->size) {
6359 	if (tail_size) {
6374 		tail_copy->offset = copy->offset + copy->size - tail_size;
6375 		tail_copy->size = tail_size;
6377 		copy->size -= tail_size;
6401 	if (tail_size) {
6446 			copy->size += tail_size;