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

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Message-ID: <aCbTtQAM6lfPFDB-@infradead.org>
Date: Thu, 15 May 2025 22:57:09 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Martin Wilck <mwilck@...e.com>
Cc: Benjamin Marzinski <bmarzins@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Kevin Wolf <kwolf@...hat.com>, dm-devel@...ts.linux.dev,
	Hanna Czenczek <hreitz@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>, snitzer@...nel.org,
	"Kernel Mailing List, Linux" <linux-kernel@...r.kernel.org>,
	Hannes Reinecke <hare@...e.com>
Subject: Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active
 paths

On Thu, May 15, 2025 at 05:00:41PM +0200, Martin Wilck wrote:
> I didn't mean it this way. I was rather musing about the question
> whether doing SG_IO on multipath devices by forwarding them to the
> current path makes sense.

It doesn't, and that's the core of the problem.  Someone back in the
day though just forwarding SG_IO would solve whatever thing they had
to do back then and which didn't have a proper kernel abstraction,
and it keeps adding problems.