RE: [PATCH 1/2] scsi: hyper-v storvsc switch up to SPC-3

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> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@xxxxxxxxxxxxxxxxxxxxx]
> Sent: Friday, May 16, 2014 11:25 AM
> To: Ian Abbott
> Cc: linux-scsi@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; Andy
> Whitcroft; KY Srinivasan; Haiyang Zhang; Tim Gardner
> Subject: Re: [PATCH 1/2] scsi: hyper-v storvsc switch up to SPC-3
> 
> On Fri, 2014-05-16 at 19:18 +0100, Ian Abbott wrote:
> > On 2014-05-16 18:58, James Bottomley wrote:
> > > On Fri, 2014-05-16 at 18:39 +0100, Ian Abbott wrote:
> > >> On 2014-05-16 18:14, James Bottomley wrote:
> > >>> On Fri, 2014-05-16 at 16:39 +0100, Ian Abbott wrote:
> > >>>> From: Andy Whitcroft <apw@xxxxxxxxxxxxx>
> > >>>>
> > >>>> Suggested-by: James Bottomley
> > >>>> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
> > >>>
> > >>> That is my patch, isn't it, just with a slightly modified comment:
> > >>>
> > >>> http://marc.info/?l=linux-scsi&m=137908428211951
> > >>
> > >> I believe so, yes.  Looking at Ubuntu's kernel repository, Andy
> > >> reverted his original 4 patches and applied your patch instead.
> > >> I'm not sure about the other patch (PATCH 2/2) that disables the
> > >> MAINTENANCE_IN command.  Perhaps that was needed as a
> consequence
> > >> of claiming to be SCSI level SPC-3?
> > >
> > > Yes, see other email.
> > >
> > >>> Andy promised to go off and test it and that's where the thread
> > >>> ended. I take it the results of the testing was positive?  I was
> > >>> expecting him to report back on that so KY could ack the patch.
> > >>>
> > >>> James
> > >>
> > >> The patch seems to be in Ubuntu Saucy's 3.11 kernel version
> > >> 3.11.0-12.18 onwards - see
> > >> http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-saucy.git;a=log;h=refs
> > >> /tags/Ubuntu-3.11.0-12.18
> > >> for the logs.
> > >>
> > >> Would you like me to resubmit the patch with you as the author?
> > >> There isn't a "Signed-off-by:" line for you on this patch at the
> > >> moment.  Is it okay for me to add one?
> > >
> > > I'm not really comfortable with the way these patches are being
> > > submitted.  I really need Andy to justify what's been done and why,
> > > then find an upstream acceptable format then for the Microsoft
> > > Hyper-V guys to ack them.  We need more information than you can
> > > infer simply from the patches being in Ubuntu.  If Andy's off
> > > somewhere, we can wait because this is just simply feature
> > > enablement; the bug doesn't show unless you enable trim on hv storvsc.
> >
> > TBH, I'm out of my depth on this, but hopefully I've kicked up the
> > dust a bit, since the patches (good or bad) have been languishing in
> > Ubuntu's repositories since October!
> 
> That's OK, thanks for doing this; I'd forgotten about the patch.

Sorry to be jumping in late on this discussion. If I remember correctly, the patch
Ubuntu  has been carrying I think is the original patch from Andy that James did not like.
Checking with the Windows guys, they are not comfortable declaring compliance
with SPC_3 when no testing has been done to verify this compliance. Hopefully, soon our host
will be SPC_3 compliant and we will not need Andy's (original patch).

Regards,

K. Y

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