linux-kernel - Re: [PATCH] scsi: Export SCSI Inquiry data to sysfs

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Message-ID: <55CDE4CA.6060703@suse.de>
Date:	Fri, 14 Aug 2015 14:53:30 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	James Smart <james.smart@...gotech.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	"James E.J. Bottomley" <JBottomley@...n.com>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: Export SCSI Inquiry data to sysfs

On 08/14/2015 02:27 PM, James Smart wrote:
> On 8/14/2015 2:32 AM, Hannes Reinecke wrote:
>> On 08/13/2015 01:50 PM, Johannes Thumshirn wrote:
>>> Export the RAW SCSI Inquiry to sysfs as binfile. This way the
>>> data can be used by userlang without the need to have and ioctl or use the
>>> sg_inq tool.
>>>
>> userland!
>>
> 
> Just be careful. There are conditions where this could be stale
> data....   LUN reconfig on an array that hasn't been rescanned by
> the mid layer yet is such a case.
> 
> Any reason you didn't have the sysfs call initiate a lun scan or
> send an inquiry so it's always valid data ?
> 
Currently the SCSI stack doesn't do LUN rescanning; the only way
to recover from stale data is to remove the device and initiate
a host rescan. That's why we have tools like rescan-scsi-bus.sh etc.

We're working on moving the SCSI stack to do a LUN rescanning, but
that's still future stuff.

So this patch just displays the status quo, without any added
functionality.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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