Function vm_fault_next

freebsd/vm/vm_fault.c:998–1038

}

static bool
vm_fault_next(struct faultstate *fs)
{
	vm_object_t next_object;

	/*
	 * The requested page does not exist at this object/
	 * offset.  Remove the invalid page from the object,
	 * waking up anyone waiting for it, and continue on to
	 * the next object.  However, if this is the top-level
	 * object, we must leave the busy page in place to
	 * prevent another process from rushing past us, and
	 * inserting the page in that object at the same time
	 * that we are.
	 */
	if (fs->object == fs->first_object) {
		fs->first_m = fs->m;
		fs->m = NULL;
	} else
		fault_page_free(&fs->m);

	/*
	 * Move on to the next object.  Lock the next object before
	 * unlocking the current one.
	 */
	VM_OBJECT_ASSERT_WLOCKED(fs->object);
	next_object = fs->object->backing_object;
	if (next_object == NULL)
		return (false);
	MPASS(fs->first_m != NULL);
	KASSERT(fs->object != next_object, ("object loop %p", next_object));
	VM_OBJECT_WLOCK(next_object);
	vm_object_pip_add(next_object, 1);
	if (fs->object != fs->first_object)
		vm_object_pip_wakeup(fs->object);
	fs->pindex += OFF_TO_IDX(fs->object->backing_object_offset);
	VM_OBJECT_WUNLOCK(fs->object);
	fs->object = next_object;

	return (true);
}

static void
vm_fault_zerofill(struct faultstate *fs)