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Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices
Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime.
Tue, 01 Mar 2011 14:13:45 -0500
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On 03/01/2011 07:50 AM, Christoph Hellwig wrote:
On Tue, Mar 01, 2011 at 12:48:34PM +0000, Stefan Hajnoczi wrote:
On Tue, Mar 01, 2011 at 01:42:54PM +0100, Christoph Hellwig wrote:
I have patches to do that, and to allow changing O_DIRECT via a monitor
command, but to toggle O_SYNC via fcntl I first need to get a kernel
patch in as that's currently not allowed to be changed at runtime.
Great it sounds like you have already implemented the two cases (guest wce and
host O_DIRECT) that we're talking about.
At least in theory. And for Linux I can add setting/clearing of O_SYNC
via fcntl easily, but what do we do for other hosts?
To start with, we can just fail the command at the QMP level.
I'm not sure
closing/reopening the backing file is easily feasible.
Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime., Anthony Liguori, 2011/03/01