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
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SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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