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Date: Wed, 3 Sep 2014 13:10:46 +0200
From: Kevin Wolf <kwolf@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3] block: Introduce "null" driver
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To: Fam Zheng <famz@redhat.com>
Cc: benoit.canet@irqsave.net, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>, armbru@redhat.com

Am 29.08.2014 um 02:55 hat Fam Zheng geschrieben:
> On Thu, 08/28 16:23, Eric Blake wrote:
> > On 08/27/2014 11:53 PM, Fam Zheng wrote:
> > > This is an analogue to Linux null_blk. It can be used for testing block
> > > device emulation and general block layer functionalities such as
> > > coroutines and throttling, where disk IO is not necessary or wanted.
> > > 
> > > Use null:// for AIO version, and null-co:// for coroutine version.
> > > 
> > > Signed-off-by: Fam Zheng <famz@redhat.com>
> > > 
> > > ---
> > 
> > > +++ b/qapi/block-core.json
> > > @@ -1150,7 +1150,8 @@
> > >    'data': [ 'archipelago', 'file', 'host_device', 'host_cdrom', 'host_floppy',
> > >              'http', 'https', 'ftp', 'ftps', 'tftp', 'vvfat', 'blkdebug',
> > >              'blkverify', 'bochs', 'cloop', 'cow', 'dmg', 'parallels', 'qcow',
> > > -            'qcow2', 'qed', 'raw', 'vdi', 'vhdx', 'vmdk', 'vpc', 'quorum' ] }
> > > +            'qcow2', 'qed', 'raw', 'vdi', 'vhdx', 'vmdk', 'vpc', 'quorum',
> > > +            'null' ] }
> > 
> > As mentioned elsewhere, you probably want 'null' AND 'null-co'.  Bummer
> > that this list is mostly alphabetical, but that 'quorum' and 'null' are
> > out of order.
> 
> I'll add null-co to the list. But this list is a bit far from alphabetical:
> 
> archipelago, ..., vvfat, blkdebug,...

Actually it's pretty close to alphabetical as the secondary criterion
(the primary one is that all protocols are listed first, and only then
the formats).

Kevin