linux-kernel - Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active paths

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Message-ID: <0340c51e-6f89-4799-b2f1-19c785a19ff2@suse.de>
Date: Tue, 13 May 2025 08:09:45 +0200
From: Hannes Reinecke <hare@...e.de>
To: Christoph Hellwig <hch@...radead.org>, Kevin Wolf <kwolf@...hat.com>
Cc: Martin Wilck <mwilck@...e.com>, dm-devel@...ts.linux.dev,
 hreitz@...hat.com, mpatocka@...hat.com, snitzer@...nel.org,
 bmarzins@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active
 paths

On 5/13/25 07:55, Christoph Hellwig wrote:
> On Mon, May 12, 2025 at 05:18:43PM +0200, Kevin Wolf wrote:
>> Yes, it's a bit unfortunate, but we have to work with what we have. QEMU
>> doesn't even necessarily know that it's dealing with a multipath device,
>> so it just has to blindly try the ioctl and see if it works.
> 
> Why is qemu even using SG_IO to start with?
> 
To be able to forward SCSI commands.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich