1 files changed, 46 insertions, 0 deletions
diff --git a/sys/vm/vm_reserv.c b/sys/vm/vm_reserv.c
index 8f34b31..8bb1788 100644
--- a/sys/vm/vm_reserv.c
+++ b/sys/vm/vm_reserv.c
@@ -866,6 +866,35 @@ vm_reserv_init(void)
 }
 
 /*
+ * Returns true if the given page belongs to a reservation and that page is
+ * free.  Otherwise, returns false.
+ */
+bool
+vm_reserv_is_page_free(vm_page_t m)
+{
+	vm_reserv_t rv;
+
+	mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
+	rv = vm_reserv_from_page(m);
+	if (rv->object == NULL)
+		return (false);
+	return (popmap_is_clear(rv->popmap, m - rv->pages));
+}
+
+/*
+ * If the given page belongs to a reservation, returns the level of that
+ * reservation.  Otherwise, returns -1.
+ */
+int
+vm_reserv_level(vm_page_t m)
+{
+	vm_reserv_t rv;
+
+	rv = vm_reserv_from_page(m);
+	return (rv->object != NULL ? 0 : -1);
+}
+
+/*
  * Returns a reservation level if the given page belongs to a fully-populated
  * reservation and -1 otherwise.
  */
@@ -1076,6 +1105,23 @@ vm_reserv_rename(vm_page_t m, vm_object_t new_object, vm_object_t old_object,
 }
 
 /*
+ * Returns the size (in bytes) of a reservation of the specified level.
+ */
+int
+vm_reserv_size(int level)
+{
+
+	switch (level) {
+	case 0:
+		return (VM_LEVEL_0_SIZE);
+	case -1:
+		return (PAGE_SIZE);
+	default:
+		return (0);
+	}
+}
+
+/*
  * Allocates the virtual and physical memory required by the reservation
  * management system's data structures, in particular, the reservation array.
  */