[PATCH 2/2] xfs: disable large folio support in xfile_create

[Christoph Hellwig]

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.

Reported-by: Darrick J. Wong <djwong at kernel.org>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 fs/xfs/scrub/xfile.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/xfs/scrub/xfile.c b/fs/xfs/scrub/xfile.c
index 090c3ead43fdf1..1a8d1bedd0b0dc 100644
--- a/fs/xfs/scrub/xfile.c
+++ b/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;
-- 
2.39.2