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Date: Sat, 8 Oct 2011 12:24:37 +0100
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From: Stefan Hajnoczi <stefanha@gmail.com>
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Subject: Re: [Qemu-devel] [PATCH 1/2] hw/9pfs: Add new virtfs option
 cache=writethrough to skip host page cache
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To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org

On Fri, Oct 7, 2011 at 7:46 AM, Aneesh Kumar K.V
<aneesh.kumar@linux.vnet.ibm.com> wrote:
> cache=3Dwritethrough implies the file are opened in the host with O_SYNC =
open flag
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> ---
> =A0fsdev/file-op-9p.h =A0 =A0 =A0 =A0 | =A0 =A01 +
> =A0fsdev/qemu-fsdev.c =A0 =A0 =A0 =A0 | =A0 10 ++++++++--
> =A0fsdev/qemu-fsdev.h =A0 =A0 =A0 =A0 | =A0 =A02 ++
> =A0hw/9pfs/virtio-9p-device.c | =A0 =A05 +++++
> =A0hw/9pfs/virtio-9p.c =A0 =A0 =A0 =A0| =A0 24 ++++++++++++++++++------
> =A0qemu-config.c =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A06 ++++++
> =A0qemu-options.hx =A0 =A0 =A0 =A0 =A0 =A0| =A0 17 ++++++++++++-----
> =A0vl.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A06 ++++++
> =A08 files changed, 58 insertions(+), 13 deletions(-)

When would this be used?  For serving up vanilla 9P?

I think 9P.u and 9P.l have support for fsync(2) while vanilla 9P does not.

Stefan