679 	vm_object_t             copy_object = VM_OBJECT_NULL;  in vm_object_update()  local
721 		while ((copy_object = object->vo_copy) != VM_OBJECT_NULL) {  in vm_object_update()
728 			if (vm_object_lock_try(copy_object)) {  in vm_object_update()
739 				vm_object_reference_locked(copy_object);  in vm_object_update()
750 	if ((copy_object != VM_OBJECT_NULL && update_cow) || (flags & MEMORY_OBJECT_DATA_SYNC)) {  in vm_object_update()
760 		if (copy_object != VM_OBJECT_NULL) {  in vm_object_update()
764 			copy_offset = (offset >= copy_object->vo_shadow_offset) ?  in vm_object_update()
765 			    (offset - copy_object->vo_shadow_offset) : 0;  in vm_object_update()
767 			if (copy_offset > copy_object->vo_size) {  in vm_object_update()
768 				copy_offset = copy_object->vo_size;  in vm_object_update()
774 			if (offset >= copy_object->vo_shadow_offset) {  in vm_object_update()
776 			} else if (size >= copy_object->vo_shadow_offset - offset) {  in vm_object_update()
777 				copy_size = (size - (copy_object->vo_shadow_offset - offset));  in vm_object_update()
782 			if (copy_offset + copy_size > copy_object->vo_size) {  in vm_object_update()
783 				if (copy_object->vo_size >= copy_offset) {  in vm_object_update()
784 					copy_size = copy_object->vo_size - copy_offset;  in vm_object_update()
791 			copy_object = object;  in vm_object_update()
804 		vm_object_paging_begin(copy_object);  in vm_object_update()
813 			result = vm_fault_page(copy_object, i,  in vm_object_update()
830 					vm_object_lock(copy_object);  in vm_object_update()
831 					vm_object_paging_begin(copy_object);  in vm_object_update()
841 				vm_page_wakeup_done(copy_object, page);  in vm_object_update()
845 				vm_object_lock(copy_object);  in vm_object_update()
846 				vm_object_paging_begin(copy_object);  in vm_object_update()
850 				vm_object_lock(copy_object);  in vm_object_update()
851 				vm_object_paging_begin(copy_object);  in vm_object_update()
856 				vm_object_lock(copy_object);  in vm_object_update()
857 				vm_object_paging_begin(copy_object);  in vm_object_update()
861 				vm_object_paging_end(copy_object);  in vm_object_update()
862 				vm_object_unlock(copy_object);  in vm_object_update()
865 				if (object != copy_object) {  in vm_object_update()
866 					vm_object_deallocate(copy_object);  in vm_object_update()
875 		vm_object_paging_end(copy_object);  in vm_object_update()
878 		if (copy_object != VM_OBJECT_NULL && copy_object != object) {  in vm_object_update()
879 			vm_object_unlock(copy_object);  in vm_object_update()
880 			vm_object_deallocate(copy_object);  in vm_object_update()
885 	if (copy_object != VM_OBJECT_NULL && copy_object != object) {  in vm_object_update()
887 			vm_object_lock_assert_exclusive(copy_object);  in vm_object_update()
888 			VM_OBJECT_SET_SHADOW_SEVERED(copy_object, TRUE);  in vm_object_update()
889 			VM_OBJECT_SET_SHADOWED(copy_object, FALSE);  in vm_object_update()
890 			copy_object->shadow = NULL;  in vm_object_update()
896 		vm_object_unlock(copy_object);  in vm_object_update()
897 		vm_object_deallocate(copy_object);  in vm_object_update()