linux-kernel - Re: [PATCH v1] fs/dax: fix folio splitting issue by resetting old folio order + _nr

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Message-Id: <20250417155916.92e62e45dc1d82010f47519e@linux-foundation.org>
Date: Thu, 17 Apr 2025 15:59:16 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Dan Williams <dan.j.williams@...el.com>
Cc: ", Darrick J. Wong" <djwong@...nel.org>, Alison Schofield
 <alison.schofield@...el.com>, David Hildenbrand <david@...hat.com>,
 <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
 <linux-fsdevel@...r.kernel.org>, <nvdimm@...ts.linux.dev>, Alexander Viro
 <viro@...iv.linux.org.uk>, "Christian Brauner" <brauner@...nel.org>, Jan
 Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>,
 "Alistair Popple" <apopple@...dia.com>, Christoph Hellwig
 <hch@...radead.org>
Subject: Re: [PATCH v1] fs/dax: fix folio splitting issue by resetting old
 folio order + _nr_pages

On Thu, 17 Apr 2025 11:01:54 -0700 Dan Williams <dan.j.williams@...el.com> wrote:

> Darrick J. Wong wrote:
> > On Thu, Apr 10, 2025 at 12:12:33PM -0700, Alison Schofield wrote:
> > > On Thu, Apr 10, 2025 at 11:10:20AM +0200, David Hildenbrand wrote:
> > > > Alison reports an issue with fsdax when large extends end up using
> > > > large ZONE_DEVICE folios:
> > > >
> > > 
> > > Passes the ndctl/dax unit tests.
> > > 
> > > Tested-by: Alison Schofield <alison.schofield@...el.com>
> > 
> > This fixes the crash I complained about here:
> > https://lore.kernel.org/linux-fsdevel/20250417030143.GO25675@frogsfrogsfrogs/T/
> > 
> > Can we get a fix queued up for -rc3 if it hasn't been already, please?
> > 
> > Tested-by: "Darrick J. Wong" <djwong@...nel.org>
> 
> Andrew, please pick this up, I have nothing else pending in the dax
> area.

Yep, I have it in mm-hotfixes.

I wasn't particularly planning on sending another batch to Linus this
week, but let's do that.  From: Easter Bunny.