From be1b771edf344615e31f310259b2793c95c1d217 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Fri, 11 Dec 2015 20:24:36 +0100
Subject: util.datamanager: Handle potential issues from fallocate

---
 util/datamanager.lua | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/util/datamanager.lua b/util/datamanager.lua
index 786abd95..3016feed 100644
--- a/util/datamanager.lua
+++ b/util/datamanager.lua
@@ -222,7 +222,16 @@ local function append(username, host, datastore, ext, data)
 	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
-- 
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