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:	Mon, 14 Jul 2014 01:30:47 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Hannes Reinecke <hare@...e.de>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>, jasowang@...hat.com,
	apw@...onical.com, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, ohering@...e.com,
	jbottomley@...allels.com, hch@...radead.org,
	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 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.

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