linux-kernel - Re: [PATCH] virtio-blk: allow toggling host cache between writeback and writethrough

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Date:	Thu, 05 Jul 2012 09:02:23 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	kvm@...r.kernel.org
Subject: Re: [PATCH] virtio-blk: allow toggling host cache between writeback
 and writethrough

On Thu, 2012-07-05 at 08:47 +0200, Paolo Bonzini wrote:
> Il 04/07/2012 23:11, Sasha Levin ha scritto:
> > There are two things going on here:
> >  1. Rename VIRTIO_BLK_F_FLUSH to VIRTIO_BLK_F_WCE
> >  2. Add a new VIRTIO_BLK_F_CONFIG_WCE
> > 
> > I'm concerned that the first change is going to break compilation for
> > any code that included linux/virtio-blk.h and used VIRTIO_BLK_F_FLUSH.
> 
> That would be nlkt, right? :)

nlkt, lguest, and probably others.

linux/virtio_blk.h is a public kernel header, which is supposed to be
used from userspace - so I assume many others who implemented virtio-blk
for any reason took advantage of that header.

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