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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Date:   Mon, 6 Jun 2022 09:49:04 +0200
From:   Christoph Hellwig <hch@....de>
To:     Salvatore Bonaccorso <carnil@...ian.org>
Cc:     Christoph Hellwig <hch@....de>,
        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)

On Sun, Jun 05, 2022 at 12:00:10PM +0200, Salvatore Bonaccorso wrote:
> 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 .

Normally the stable process takes care of such trivial changes.  I'll
wait for the next batch and if not take care of it manually.