The quilt patch titled Subject: nilfs2: do not write dirty data after degenerating to read-only has been removed from the -mm tree. Its filename was nilfs2-do-not-write-dirty-data-after-degenerating-to-read-only.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------ From: Ryusuke Konishi konishi.ryusuke@gmail.com Subject: nilfs2: do not write dirty data after degenerating to read-only Date: Thu, 27 Apr 2023 10:15:26 +0900

According to syzbot's report, mark_buffer_dirty() called from nilfs_segctor_do_construct() outputs a warning with some patterns after nilfs2 detects metadata corruption and degrades to read-only mode.

After such read-only degeneration, page cache data may be cleared through nilfs_clear_dirty_page() which may also clear the uptodate flag for their buffer heads. However, even after the degeneration, log writes are still performed by unmount processing etc., which causes mark_buffer_dirty() to be called for buffer heads without the "uptodate" flag and causes the warning.

Since any writes should not be done to a read-only file system in the first place, this fixes the warning in mark_buffer_dirty() by letting nilfs_segctor_do_construct() abort early if in read-only mode.

This also changes the retry check of nilfs_segctor_write_out() to avoid unnecessary log write retries if it detects -EROFS that nilfs_segctor_do_construct() returned.

Link: https://lkml.kernel.org/r/20230427011526.13457-1-konishi.ryusuke@gmail.com Signed-off-by: Ryusuke Konishi konishi.ryusuke@gmail.com Tested-by: Ryusuke Konishi konishi.ryusuke@gmail.com Reported-by: syzbot+2af3bc9585be7f23f290@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=2af3bc9585be7f23f290 Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/nilfs2/segment.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/nilfs2/segment.c~nilfs2-do-not-write-dirty-data-after-degenerating-to-read-only +++ a/fs/nilfs2/segment.c @@ -2041,6 +2041,9 @@ static int nilfs_segctor_do_construct(st struct the_nilfs *nilfs = sci->sc_super->s_fs_info; int err;

+ if (sb_rdonly(sci->sc_super)) + return -EROFS; + nilfs_sc_cstage_set(sci, NILFS_ST_INIT); sci->sc_cno = nilfs->ns_cno;

@@ -2724,7 +2727,7 @@ static void nilfs_segctor_write_out(stru

flush_work(&sci->sc_iput_work);

- } while (ret && retrycount-- > 0); + } while (ret && ret != -EROFS && retrycount-- > 0); }

/** _

Patches currently in -mm which might be from konishi.ryusuke@gmail.com are