linux-kernel - Re: New partition on loop device doesn't appear in /dev anymore with kernel 5.17.0 and newer (repro script included)

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Message-ID: <Ypx+qusVyLJEEb/r@eldamar.lan>
Date:   Sun, 5 Jun 2022 12:00:10 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Michael Schaller <misch@...gle.com>, axboe@...nel.dk,
        linux-block@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: New partition on loop device doesn't appear in /dev anymore with
 kernel 5.17.0 and newer (repro script included)

Hi,

On Fri, Jun 03, 2022 at 03:23:13PM +0200, Christoph Hellwig wrote:
> On Fri, Jun 03, 2022 at 03:21:28PM +0200, Michael Schaller wrote:
> > Thank you, Christoph! <3
> > 
> > Patch https://lore.kernel.org/all/20220527055806.1972352-1-hch@lst.de/
> > does indeed fix the issue.
> > 
> > Could this patch also be backported to 5.17 and 5.18?
> 
> It should get picked up automatically based on the fixes tag as soon
> as it hits mainline.

As it does not apply cleanly to older versions, this probably will
need a sperate turnaround, but AFAICS it's just because of
a0e286b6a5b6 ("loop: remove lo_refcount and avoid lo_mutex in ->open /
->release") changing context of the fourth hunk in
drivers/block/loop.c .

Regards,
Salvatore