From: Hannes Reinecke <hare@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: James Bottomley <jbottomley@parallels.com>, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 3/3] scsi: Implement 'ZBC' device type
Date: Mon, 02 Jun 2014 10:46:35 +0200 [thread overview]
Message-ID: <538C39EB.90109@suse.de> (raw)
In-Reply-To: <20140602083919.GA31170@infradead.org>
On 06/02/2014 10:39 AM, Christoph Hellwig wrote:
> On Mon, Jun 02, 2014 at 09:01:18AM +0200, Hannes Reinecke wrote:
>> ZBC (zoned block command aka 'SMR drives') devices will have
>> a new device type 0x14 assigned by T10. So add the necessary
>> mappings to sd.c and make it an alias for ATA ZAC devices.
>
> The libata changes should defintively be a separate one, the sd changes
> probably as well.
>
> But I'm uneasy with adding anything like this for now, for one the specs
> aren't even anywhere close to done, and second attaching ZBC devices
> in general doesn't sound like a very smart idea, we really need a
> strategy for the sequential required zones first.
>
In theory, yes.
In practice, however, ZAC drives will show up a normal ATA devices
without that patch. Which is leading to even more trouble.
So with this patch we're at least signalling to the user that
something odd might happen.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.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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next prev parent reply other threads:[~2014-06-02 8:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-02 7:01 [PATCH 0/3] Initial SMR drive support Hannes Reinecke
2014-06-02 7:01 ` [PATCH 1/3] libata: consolidate ata_dev_classify() Hannes Reinecke
2014-06-02 9:16 ` Christoph Hellwig
2014-06-02 7:01 ` [PATCH 2/3] libata: Implement ATA_DEV_ZAC Hannes Reinecke
2014-06-02 9:17 ` Christoph Hellwig
2014-06-14 6:37 ` Hannes Reinecke
2014-06-02 7:01 ` [PATCH 3/3] scsi: Implement 'ZBC' device type Hannes Reinecke
2014-06-02 8:39 ` Christoph Hellwig
2014-06-02 8:46 ` Hannes Reinecke [this message]
2014-06-02 9:20 ` Christoph Hellwig
2014-06-02 9:19 ` Christoph Hellwig
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