linux-kernel - Re: [dm-devel] [PATCH v2 0/4] Diskseq support in device-mapper

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Date: Mon, 15 Jan 2024 18:56:16 +0100
From: Martin Wilck <mwilck@...e.com>
To: Demi Marie Obenour <demi@...isiblethingslab.com>, Alasdair Kergon
 <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>,
 dm-devel@...ts.linux.dev,  Christoph Hellwig <hch@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, Franck Bui
	 <fbui@...e.com>
Subject: Re: [dm-devel] [PATCH v2 0/4] Diskseq support in device-mapper

On Sat, 2023-06-24 at 19:09 -0400, Demi Marie Obenour wrote:
> This work aims to allow userspace to create and destroy device-mapper
> devices in a race-free way.

The discussion about this feature seems to have stalled ... will there
be a v3 of this series any time soon?

Also, I am wondering what should happen if a device-mapper table is
changed in a SUSPEND/LOAD/RESUME cycle. Such operations can change the
content of the device, thus I assume that the diskseq should also
change. But AFAICS this wasn't part of your patch set.

In general, whether the content changes in a reload operation depends
on the target. The multipath target, for example, reloads frequently
without changing the content of the dm device. An ever-changing diskseq
wouldn't make a lot of sense for dm-multipath. But I doubt we want to
start making distinctions on this level, so I guess that diskseq and
multipath just won't go well together.

Regards,
Martin