Add assertion.

diff --git a/libexfat/cluster.c b/libexfat/cluster.c
index 5dae25f..0f2d76a 100644 (file)
--- a/libexfat/cluster.c
+++ b/libexfat/cluster.c
@@ -361,6 +361,9 @@ int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size)
        uint32_t c2 = bytes2clusters(ef, size);
        int rc = 0;
 
+       if (node->references == 0 && node->parent)
+               exfat_bug("no references, node changes can be lost");
+
        if (node->size == size)
                return 0;