util.datamanager: Handle potential issues from fallocate

diff --git a/util/datamanager.lua b/util/datamanager.lua
index 786abd956381193c7e4b9c87093d375ebd499cd0..3016feed8beb224ba79bfbc666615ec72a825393 100644 (file)
--- 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