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Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices

From: Kevin Wolf
Subject: Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime.
Date: Tue, 01 Mar 2011 13:52:52 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

Am 01.03.2011 13:42, schrieb Christoph Hellwig:
> The only way to change the cache settings is from the guest.  Without
> that we're guranteed to lose data when going from WCE=0 to WCE=1.
> 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.

We can re-open the file for now, and we need an implementation for older
kernels/other host OSes anyway, so I don't think we have to wait for the
kernel patch to be accepted.


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