osfmk/vm/vm_object.c

3473 	vm_object_t		old_copy;
3539 	old_copy = src_object->copy;
3540 	if (old_copy != VM_OBJECT_NULL) {
3547 		        lock_granted = vm_object_lock_try_shared(old_copy);
3549 		        lock_granted = vm_object_lock_try(old_copy);
3577 		if (old_copy->resident_page_count == 0 &&
3578 		    !old_copy->pager_created) {
3588 			if (old_copy->vo_size < copy_size) {
3590 				        vm_object_unlock(old_copy);
3608 					    p->offset >= old_copy->vo_size &&
3611 							vm_object_unlock(old_copy);
3626 				old_copy->vo_size = copy_size;
3629 			        vm_object_reference_shared(old_copy);
3631 			        vm_object_reference_locked(old_copy);
3632 			vm_object_unlock(old_copy);
3639 			return(old_copy);
3649 		if (old_copy->vo_size > copy_size)
3650 			copy_size = old_copy->vo_size;
3653 			vm_object_unlock(old_copy);
3671 		assert((old_copy->shadow == src_object) &&
3672 		    (old_copy->vo_shadow_offset == (vm_object_offset_t) 0));
3700 				if (old_copy)
3701 					vm_object_unlock(old_copy);
3712 	if (old_copy != VM_OBJECT_NULL) {
3719 		/* remove ref. from old_copy */
3723 		vm_object_lock_assert_exclusive(old_copy);
3724 		old_copy->shadow = new_copy;
3727 		new_copy->ref_count++;		/* for old_copy->shadow ref. */
3730 		if (old_copy->res_count) {
3736 		vm_object_unlock(old_copy);	/* done with old_copy */