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

From: Christoph Hellwig
Subject: Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime.
Date: Tue, 1 Mar 2011 13:42:54 +0100
User-agent: Mutt/1.3.28i 
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.
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