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

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Message-ID: <20250417034406.GF25659@frogsfrogsfrogs>
Date: Wed, 16 Apr 2025 20:44:06 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: 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>,
	Andrew Morton <akpm@...ux-foundation.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, 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>

--D

> 
> snip
> 
>