From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH 3/3] scsi: Implement 'ZBC' device type Date: Mon, 02 Jun 2014 10:46:35 +0200 Message-ID: <538C39EB.90109@suse.de> References: <1401692478-23557-1-git-send-email-hare@suse.de> <1401692478-23557-4-git-send-email-hare@suse.de> <20140602083919.GA31170@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from cantor2.suse.de ([195.135.220.15]:39051 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751998AbaFBIqg (ORCPT ); Mon, 2 Jun 2014 04:46:36 -0400 In-Reply-To: <20140602083919.GA31170@infradead.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Christoph Hellwig Cc: James Bottomley , linux-scsi@vger.kernel.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 chang= es > probably as well. > > But I'm uneasy with adding anything like this for now, for one the sp= ecs > 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=20 without that patch. Which is leading to even more trouble. So with this patch we're at least signalling to the user that=20 something odd might happen. Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: J. Hawn, J. Guild, F. Imend=F6rffer, HRB 16746 (AG N=FCrnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html