# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1449861876 -3600
# Node ID 0ab228bc21c64956e71e68f1b6ccdb959e36d59a
# Parent  644b1bddc676e77f86da5e590bc9dc29a00d7ab2
util.datamanager: Handle potential issues from fallocate

diff -r 644b1bddc676 -r 0ab228bc21c6 util/datamanager.lua
--- a/util/datamanager.lua	Fri Dec 11 20:22:54 2015 +0100
+++ b/util/datamanager.lua	Fri Dec 11 20:24:36 2015 +0100
@@ -222,7 +222,16 @@
 	end
 	local pos = f:seek("end");
 	ok, msg = fallocate(f, pos, #data);
-	f:seek("set", pos);
+	if not ok then
+		log("warn", "fallocate() failed: %s", tostring(msg));
+		-- This doesn't work on every file system
+	end
+
+	if f:seek() ~= pos then
+		log("debug", "fallocate() changed file position");
+		f:seek("set", pos);
+	end
+
 	if ok then
 		f:write(data);
 	else