FAILED: Patch "nilfs2: fix kernel bug due to missing clearing of checked flag" failed to apply to v5.15-stable tree

The patch below does not apply to the v5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 41e192ad2779cae0102879612dfe46726e4396aa Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <[email protected]>
Date: Fri, 18 Oct 2024 04:33:10 +0900
Subject: [PATCH] nilfs2: fix kernel bug due to missing clearing of checked
flag

Syzbot reported that in directory operations after nilfs2 detects filesystem corruption and degrades to read-only, __block_write_begin_int(), which is called to prepare block writes, may fail the BUG_ON check for accesses exceeding the folio/page size, triggering a kernel bug.

This was found to be because the "checked" flag of a page/folio was not cleared when it was discarded by nilfs2's own routine, which causes the sanity check of directory entries to be skipped when the directory page/folio is reloaded. So, fix that.

This was necessary when the use of nilfs2's own page discard routine was applied to more than just metadata files.

---
 fs/nilfs2/page.c | 1 +
 1 file changed, 1 insertion(+)

index 5436eb0424bd1..10def4b559956 100644
@@ -401,6 +401,7 @@ void nilfs_clear_folio_dirty(struct folio *folio)
 
 	folio_clear_uptodate(folio);
 	folio_clear_mappedtodisk(folio);
+	folio_clear_checked(folio);
 
 	head = folio_buffers(folio);
 	if (head) {

2.43.0