mmap vs mtime in 2.6.26 and up

[Christoph Hellwig]

On Fri, May 15, 2009 at 06:40:29PM +0200, Ferenc Wagner wrote:
> Thanks for the analysis.  Unfortunately I don't nearly know enough to
> work on this issue, but would like to track it as it affects our
> backup system.  So, shouldn't #2645 be reopened again?

Yes, definitively as the current "fix" is incorrected.  I'll try to cook
up a correct version once I get some time.