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Date: Wed, 20 Jan 2010 13:37:13 +0000
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] Re: [PATCH v2 2/4] Clean-up a little bit the RW
	related bits of BDRV_O_FLAGS. BDRV_O_RDONLY gone (and so is
	BDRV_O_ACCESS). Default value for bdrv_flags (0/zero) is
	READ-ONLY. Need to explicitly request READ-WRITE.
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Naphtali Sprei <nsprei@redhat.com>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org

Michael S. Tsirkin wrote:
> On Wed, Jan 20, 2010 at 08:26:56AM +0100, Markus Armbruster wrote:
> > Jamie Lokier <jamie@shareable.org> writes:
> > 
> > > Michael S. Tsirkin wrote:
> > >> On Mon, Jan 18, 2010 at 11:34:59AM +0100, Markus Armbruster wrote:
> > >> > BDRV_O_RDWR is a flag, just like BDRV_SNAPSHOT.  We don't have
> > >> > BDRV_DONT_SNAPSHOT, either.
> > >> 
> > >> Well, this just mirros the file access macros: we have RDONLY, WRONLY
> > >> and RDRW. I assume this similarity is just historical?
> > >
> > > To avoid confusion, why don't we just call the flag BDRV_O_WRITABLE.
> > > Then it's obvious what clearing that flag means.
> > 
> > Sounds good to me.
> 
> Won't it be confused with WRONLY?

No, because nobody sane would expect qemu's blockdevs to need WRONLY :-)

-- Jamie