From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm
Date: Tue, 25 May 2010 08:03:15 -0400
Message-ID: <20100525120315.GA6773@infradead.org>
References: <20100519192222.GD61706@ncolin.muc.de> <AANLkTimXqk7oa4mtcoHX1rKWzi_Nccb0FJu_QDtwJ-sP@mail.gmail.com> <AANLkTil-aogxdnMallKTDo1bKXj6QmaU0ojJuiZgXaqC@mail.gmail.com> <4BF5A9D2.5080609@codemonkey.ws> <4BF91937.2070801@redhat.com> <4BFBAE46.5050801@redhat.com> <4BFBB3C1.9020905@redhat.com>
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Cc: Kevin Wolf <kwolf@redhat.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	Blue Swirl <blauwirbel@gmail.com>, ceph-devel@vger.kernel.org,
	Christian Brunner <chb@muc.de>, kvm@vger.kernel.org,
	qemu-devel@nongnu.org
To: Avi Kivity <avi@redhat.com>
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On Tue, May 25, 2010 at 02:25:53PM +0300, Avi Kivity wrote:
> Currently if someone wants to add a new block format, they have to  
> upstream it and wait for a new qemu to be released.  With a plugin API,  
> they can add a new block format to an existing, supported qemu.

So?  Unless we want a stable driver ABI which I fundamentally oppose as
it would make block driver development hell they'd have to wait for
a new release of the block layer.  It's really just going to be a lot
of pain for no major gain.  qemu releases are frequent enough, and if
users care enough they can also easily patch qemu.