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Re: [Qemu-devel] barriers: block layer preparations
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] barriers: block layer preparations |
Date: |
Tue, 5 May 2009 17:00:47 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Avi Kivity wrote:
> Jamie Lokier wrote:
> >Avi Kivity wrote:
> >
> >>An alternative approach is to add a new op, bdrv_aio_barrier(),
> >>submitted immediately after the write. It's probably more complicated
> >>overall.
> >>
> >
> >Is it ok to submit a zero-length bdrv_aio_writev(), when you need a
> >barrier without data?
> >
>
> We could make it so. But my point was to make barriers and writes
> orthogonal.
Yes, and my point is that you _must_ make them orthogonal if
zero-length write isn't permitted :-)
-- Jamie
[Qemu-devel] [PATCH 2/3] barriers: block-raw-posix barrier support, Christoph Hellwig, 2009/05/05
[Qemu-devel] [PATCH 3/3] barriers: virtio, Christoph Hellwig, 2009/05/05
Re: [Qemu-devel] [PATCH 0/3] write barrier support, Avi Kivity, 2009/05/05