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Date: Wed, 12 Apr 2017 10:41:26 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: filesystem dead, xfs_repair won't help
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To: Avi Kivity <avi@scylladb.com>
Cc: Christoph Hellwig <hch@infradead.org>, Eric Sandeen <sandeen@sandeen.net>, Emmanuel Florac <eflorac@intellique.com>, Brian Foster <bfoster@redhat.com>, linux-xfs@vger.kernel.org

On Wed, Apr 12, 2017 at 07:22:20PM +0300, Avi Kivity wrote:
> > > We make use of that (it's probably less important on NVMe; still why
> > > waste bandwidth needlessly).
> > In that case it would be the wrong thing for you.
> 
> Would it be under our control?

Yes, even if we switch a mkfs default you could still manually override
it as long as the device supports a smaller logical block size, similar
to how we treat 512 logical / 4k physical SAS and SATA drives today.