If argument b is set to 0, au_add_till_max returns the value of constant
ULLONG_MAX. In this case, old is equal to a and the condition fails.
Index: aufs3-standalone.git/fs/aufs/super.c
===================================================================
--- aufs3-standalone.git.orig/fs/aufs/super.c 2012-03-13 01:44:21.000000000
+0100
+++ aufs3-standalone.git/fs/aufs/super.c 2012-03-13 01:50:55.000000000
+0100
@@ -305,7 +305,7 @@
old = a;
a += b;
- if (old < a)
+ if (old <= a)
return a;
return ULLONG_MAX;
------------------------------------------------------------------------------
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