linux-kernel - RE: [PATCH V3 1/7] Drivers: scsi: storvsc: Change the limits to reflect the values on the host

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Date:	Wed, 16 Jul 2014 17:26:48 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Hannes Reinecke <hare@...e.de>,
	Christoph Hellwig <hch@...radead.org>
CC:	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH V3 1/7] Drivers: scsi: storvsc: Change the limits to
 reflect the values on the host



> -----Original Message-----
> From: Hannes Reinecke [mailto:hare@...e.de]
> Sent: Monday, July 14, 2014 1:58 AM
> To: Christoph Hellwig
> Cc: KY Srinivasan; jasowang@...hat.com; apw@...onical.com; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com; linux-scsi@...r.kernel.org;
> stable@...r.kernel.org
> Subject: Re: [PATCH V3 1/7] Drivers: scsi: storvsc: Change the limits to reflect
> the values on the host
> 
> On 07/14/2014 10:30 AM, Christoph Hellwig wrote:
> > On Mon, Jul 14, 2014 at 08:15:17AM +0200, Hannes Reinecke wrote:
> >> Limiting max_lun to 255 will make the driver to _not_ respond to LUNs
> >> higher than that; ie Well-known LUN won't work here.
> >> Also the SCSI stack will be using REPORT LUNS anyway since you're
> >> advertising SPC-2 compliance. So your driver runs into issues if
> >> Hyper-V would ever return more than 256 LUNs with the REPORT LUN
> >> command or if any of the LUNs has an addressing scheme other than
> >> '0x00'.
> >> I would suggest to raise this to the technical limit (ie the largest
> >> LUN which the _protocol_ supports) and let REPORT LUNS deal with the
> >> actual LUNs.
> >
> > I suspect hypverv doesn't support anything more.  For now I'd be
> > inclined to just put it in ASAP and if your suggestion works out fix
> > it up later, although I'll wait a bit for more review feedback.
> >
> Okay, that's fine by me.

Christoph,

Is this patch-set ready to be checked in. Let me know if you want me to make any
further corrections.

Regards,

K. Y
> 
> Cheers,
> 
> Hannes
> --
> Dr. Hannes Reinecke		      zSeries & Storage
> hare@...e.de			      +49 911 74053 688
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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