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Date: Mon, 26 Mar 2012 11:56:42 +0200
From: Christoph Hellwig <hch@lst.de>
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Subject: Re: [Qemu-devel] [RFC PATCH 06/17] block: use bdrv_{co,
	aio}_discard for write_zeroes operations
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Laager <rlaager@wiktel.com>, Christoph Hellwig <hch@lst.de>, qemu-devel@nongnu.org

On Mon, Mar 26, 2012 at 10:44:07AM +0100, Daniel P. Berrange wrote:
> This suggests that there be a new command line param to '-drive' to turn
> discard support on/off, since QEMU can't reliably know if the raw file
> it is given is intended to be fully pre-allocated by the mgmt app.

Yes.