Function vm_page_insert_after

freebsd/vm/vm_page.c:1515–1554

* vm_page_insert_after: * * Inserts the page "m" into the specified object at offset "pindex". * * The page "mpred" must immediately precede the offset "pindex" within * the specified object. * * The object must be locked. */

 *	The object must be locked.
 */
static int
vm_page_insert_after(vm_page_t m, vm_object_t object, vm_pindex_t pindex,
    vm_page_t mpred)
{
	vm_page_t msucc;

	VM_OBJECT_ASSERT_WLOCKED(object);
	KASSERT(m->object == NULL,
	    ("vm_page_insert_after: page already inserted"));
	if (mpred != NULL) {
		KASSERT(mpred->object == object,
		    ("vm_page_insert_after: object doesn't contain mpred"));
		KASSERT(mpred->pindex < pindex,
		    ("vm_page_insert_after: mpred doesn't precede pindex"));
		msucc = TAILQ_NEXT(mpred, listq);
	} else
		msucc = TAILQ_FIRST(&object->memq);
	if (msucc != NULL)
		KASSERT(msucc->pindex > pindex,
		    ("vm_page_insert_after: msucc doesn't succeed pindex"));

	/*
	 * Record the object/offset pair in this page.
	 */
	m->object = object;
	m->pindex = pindex;
	m->ref_count |= VPRC_OBJREF;

	/*
	 * Now link into the object's ordered list of backed pages.
	 */
	if (vm_radix_insert(&object->rtree, m)) {
		m->object = NULL;
		m->pindex = 0;
		m->ref_count &= ~VPRC_OBJREF;
		return (1);
	}
	vm_page_insert_radixdone(m, object, mpred);
	return (0);
}

/*
 *	vm_page_insert_radixdone: