Function vm_object_reference_locked

freebsd/vm/vm_object.c:520–531

* vm_object_reference_locked: * * Gets another reference to the given object. * * The object must be locked. */

 *	The object must be locked.
 */
void
vm_object_reference_locked(vm_object_t object)
{
	u_int old;

	VM_OBJECT_ASSERT_LOCKED(object);
	old = refcount_acquire(&object->ref_count);
	if (object->type == OBJT_VNODE && old == 0)
		vref(object->handle);
	KASSERT((object->flags & OBJ_DEAD) == 0,
	    ("vm_object_reference: Referenced dead object."));
}

/*
 * Handle deallocating an object of type OBJT_VNODE.