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Re: [Qemu-devel] Re: [PATCH] block: Enable fall-back to read-only for ba

From: Christoph Hellwig
Subject: Re: [Qemu-devel] Re: [PATCH] block: Enable fall-back to read-only for backing file
Date: Mon, 1 Feb 2010 10:06:49 +0100
User-agent: Mutt/1.3.28i

On Mon, Feb 01, 2010 at 09:46:00AM +0100, Kevin Wolf wrote:
> > Is it better to always open the backing file with read-only mode ? this 
> > will be more consistent/predictable ?
> I would love to open them read-only unconditionally, but we can't. It
> would break the commit monitor command. I think the read-only fallback
> is appropriate for backing files.

The clean way would be to require an explicit BACKING_WRITEABLE flag
if we want to commit to it.  But I suspect it's too late to refit that

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