Re: [PATCH V2 1/7] block/rbd: bump librbd requirement to luminous release

["Daniel P. Berrangé" <berrange@redhat.com>]

On Mon, Feb 15, 2021 at 12:45:01PM +0100, Peter Lieven wrote:
> Am 15.02.21 um 12:41 schrieb Daniel P. Berrangé:
> > On Mon, Feb 15, 2021 at 12:32:24PM +0100, Peter Lieven wrote:
> > > Am 15.02.21 um 11:24 schrieb Daniel P. Berrangé:
> > > > On Tue, Jan 26, 2021 at 12:25:34PM +0100, Peter Lieven wrote:
> > > > > even luminous (version 12.2) is unmaintained for over 3 years now.
> > > > > Bump the requirement to get rid of the ifdef'ry in the code.
> > > > We have clear rules on when we bump minimum versions, determined by
> > > > the OS platforms we target:
> > > > 
> > > >     https://qemu.readthedocs.io/en/latest/system/build-platforms.html
> > > > 
> > > > At this time RHEL-7 is usually the oldest platform, and it
> > > > builds with RBD 10.2.5, so we can't bump the version to 12.2.
> > > > 
> > > > I'm afraid this patch has to be dropped.
> > > 
> > > I have asked exactly this question before I started work on this series and got reply
> > > 
> > > from Jason that he sees no problem in bumping to a release which is already unmaintained
> > > 
> > > for 3 years.
> > I'm afraid Jason is wrong here.  It doesn't matter what the upstream
> > consider the support status to be. QEMU targets what the OS vendors
> > ship, and they still consider this to be a supported version.
> 
> 
> Okay, but the whole coroutine stuff would get a total mess with all the ifdef'ry.

Doesn't seem like the write zeros code is adding much more comapred to
the ifdefs that already exist... 


> Would it be an option to make a big ifdef in the rbd driver? One with old code for < 12.0.0 and one
> 
> with new code for >= 12.0.0?

..but I don't have a strong opinion on that, since I'm not maintaining this
driver.


BTW, we will be free to drop RHEL-7 in the next development cycle of
QEMU, starting after the forthcoming 6.0.0 release is out, as it will
fall out of our OS support matrix.

Regards,
Daniel
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