linux-kernel - Re: [PATCH 1/3] nbd: support FLUSH requests

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Message-Id: <20130212133207.ef6b24f5.akpm@linux-foundation.org>
Date:	Tue, 12 Feb 2013 13:32:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Alex Bligh <alex@...x.org.uk>, linux-kernel@...r.kernel.org,
	nbd-general@...ts.sf.net,
	Paul Clements <Paul.Clements@...eleye.com>
Subject: Re: [PATCH 1/3] nbd: support FLUSH requests

On Tue, 12 Feb 2013 19:06:09 +0100
Paolo Bonzini <pbonzini@...hat.com> wrote:

> Il 12/02/2013 18:37, Alex Bligh ha scritto:
> > For my education, why remove the FUA stuff?
> 
> Because I had no way to test it.
> 
> >>> > > Hmmm... the underlying storage could be md/dm RAIDs in which case FUA
> >>> > > should be cheaper than FLUSH.
> >> > 
> >> > If someone ever wrote a virtio-blk backend that sits directly ontop
> >> > of the Linux block layer that would be true.
> > In this case we don't know what the backend is sitting on top of
> > a-priori. It might be the current nbd server code, but it might
> > not be.
> 
> Do you know of any other NBD server than the "official" one and qemu-nbd?
> 

Obviously the changelog was inadequate.  Please send along a new one
which fully describes the reasons for this change.

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