+ xfs-disable-large-folio-support-in-xfile_create.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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The patch titled
     Subject: xfs: disable large folio support in xfile_create
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     xfs-disable-large-folio-support-in-xfile_create.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/xfs-disable-large-folio-support-in-xfile_create.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: xfs: disable large folio support in xfile_create
Date: Wed, 10 Jan 2024 10:21:09 +0100

The xfarray code will crash if large folios are force enabled using:

   echo force > /sys/kernel/mm/transparent_hugepage/shmem_enabled

Fixing this will require a bit of an API change, and prefeably sorting out
the hwpoison story for pages vs folio and where it is placed in the shmem
API.  For now use this one liner to disable large folios.

Link: https://lkml.kernel.org/r/20240110092109.1950011-3-hch@lst.de
Reported-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Chandan Babu R <chandan.babu@oracle.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/xfs/scrub/xfile.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/fs/xfs/scrub/xfile.c~xfs-disable-large-folio-support-in-xfile_create
+++ a/fs/xfs/scrub/xfile.c
@@ -94,6 +94,11 @@ xfile_create(
 
 	lockdep_set_class(&inode->i_rwsem, &xfile_i_mutex_key);
 
+	/*
+	 * We're not quite ready for large folios yet.
+	 */
+	mapping_clear_large_folios(inode->i_mapping);
+
 	trace_xfile_create(xf);
 
 	*xfilep = xf;
_

Patches currently in -mm which might be from hch@lst.de are

mm-add-a-mapping_clear_large_folios-helper.patch
xfs-disable-large-folio-support-in-xfile_create.patch