From 2182209a8ac1ed2f0c80893ecac4d81fcab18e18 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Sun, 9 Feb 2014 10:46:57 +0100
Subject: [PATCH] db/update/Walk: disable FindAncestorLoop() if device/inode==0

---
 src/db/update/Walk.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/db/update/Walk.cxx b/src/db/update/Walk.cxx
index 44b10e2bd..2cb360bf6 100644
--- a/src/db/update/Walk.cxx
+++ b/src/db/update/Walk.cxx
@@ -163,6 +163,11 @@ FindAncestorLoop(Storage &storage, Directory *parent,
 		 unsigned inode, unsigned device)
 {
 #ifndef WIN32
+	if (device == 0 && inode == 0)
+		/* can't detect loops if the Storage does not support
+		   these numbers */
+		return 0;
+
 	while (parent) {
 		if (!parent->have_stat &&
 		    !update_directory_stat(storage, *parent))