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From: jiangyiwen <jiangyiwen@huawei.com>
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Date: Fri, 30 Mar 2018 16:53:56 +0800
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Subject: [Qemu-devel] [RFC] About 9pfs support "O_DIRECT + aio"?
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To: Andrew Morton <akpm@linux-foundation.org>, Eric Van Hensbergen <ericvh@gmail.com>, Ron Minnich <rminnich@sandia.gov>, Latchesar Ionkov <lucho@ionkov.net>, Greg Kurz <groug@kaod.org>, aneesh.kumar@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, qemu-devel@nongnu.org

Hi everyone,

Currently, I found virtio-9p in VirtFS don't support "O_DIRECT + aio"
mode, both v9fs and qemu. So when user use "O_DIRECT + aio" mode and
increase iodepths, they can't get higher IOPS.

I want to know why v9fs don't implement this mode? And I will try to
implement this mode from now on.

Thanks,
Yiwen.