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Date: Tue, 19 Jun 2012 00:52:14 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Suresh Jayaraman <sjayaraman@suse.com>
Cc: David Howells <dhowells@redhat.com>, Justin Lecher <jlec@gentoo.org>,
        LKML <linux-kernel@vger.kernel.org>, linux-cachefs@redhat.com
Subject: Re: [PATCH] [RESEND] fs: cachefiles: Add support for large files in
 filesystem caching
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On Tue, 19 Jun 2012 10:57:27 +0530 Suresh Jayaraman <sjayaraman@suse.com> wrote:

> > How extensively was this change tested?  Please describe the testing
> > which was performed?
> > 
> 
> The original patch was tested by mounting a NFS share with fscache
> option enabled, do a md5sum on a nfs file larger than 2GB and ensure
> that the file is getting cached by fscache (watch cache size growing)
> on x86_64. 

Well it will need a lot more coverage testing than that.  truncate? 
expanding truncate?  write, lseek, pwrite, pread(), mmap(MAP_SHARED),
behavior at the new max file size (what is that?), etc.