>> > + * some devices may respond with wrong type for
>> > + * well-known logical units. Force well-known type
>> > + * to enumerate them correctly.
>> > + */
>> > + if (scsi_is_wlun(sdev->lun))
>> > + sdev->type = TYPE_WLUN;
>> > }
> ...
>
> My only concern is that the peripheral device type was included at the
outset in spc3r01 in 2001, so a design that can't get this right might have
other problems. A print might be justified to report something is amiss:
>
> if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
> sdev_printk(KERN_WARNING, sdev,
> "%s: correcting incorrect peripheral device type
0x%x for W-LUN 0x%16phN\n",
> __func__, sdev->type, sdev->lun);
> sdev->type = TYPE_WLUN;
> }
Agreed, will take care of this in next patch revision.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Elliott, Robert
(Server Storage)
Sent: Wednesday, September 24, 2014 1:50 PM
To: Christoph Hellwig; Dolev Raviv
Cc: [email protected]; [email protected];
[email protected]; [email protected];
[email protected]; Subhash Jadavani; Sujit Reddy Thumma; Martin K.
Petersen
Subject: RE: [PATCH V5 01/17] scsi: fixing the "type" for well known LUs
> From: Christoph Hellwig [mailto:[email protected]]
...
> On Wed, Sep 24, 2014 at 06:13:57PM +0300, Dolev Raviv wrote:
> > From: Subhash Jadavani <[email protected]>
> >
> > Some devices may respond with wrong type for well-known logical units.
> > This patch forces well-known type for devices which doesn't report
> > it correct.
>
> This looks fine to me, as the well known LUN addresses seem to be
> nailed down nicely in t10, but let's see if Martin or Robert disagree..
>
...
> > diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> > index 56675db..a34db9e 100644
> > --- a/drivers/scsi/scsi_scan.c
> > +++ b/drivers/scsi/scsi_scan.c
> > @@ -805,6 +805,14 @@ static int scsi_add_lun(struct scsi_device
> > *sdev,
> unsigned char *inq_result,
> > } else {
> > sdev->type = (inq_result[0] & 0x1f);
> > sdev->removable = (inq_result[1] & 0x80) >> 7;
> > +
> > + /*
> > + * some devices may respond with wrong type for
> > + * well-known logical units. Force well-known type
> > + * to enumerate them correctly.
> > + */
> > + if (scsi_is_wlun(sdev->lun))
> > + sdev->type = TYPE_WLUN;
> > }
...
My only concern is that the peripheral device type was included at the
outset in spc3r01 in 2001, so a design that can't get this right might have
other problems. A print might be justified to report something is amiss:
if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
sdev_printk(KERN_WARNING, sdev,
"%s: correcting incorrect peripheral device type
0x%x for W-LUN 0x%16phN\n",
__func__, sdev->type, sdev->lun);
sdev->type = TYPE_WLUN;
}
---
Rob Elliott HP Server Storage
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