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

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Message-ID: <680142129141c_130fd294f7@dwillia2-mobl3.amr.corp.intel.com.notmuch>
Date: Thu, 17 Apr 2025 11:01:54 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>, ", Darrick J. Wong"
	<djwong@...nel.org>, Alison Schofield <alison.schofield@...el.com>
CC: 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>, Dan
 Williams <dan.j.williams@...el.com>, 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

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.