FAILED: patch "[PATCH] f2fs: fix submit accounting for IPU writeback" failed to apply to 5.10-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 5.10-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 <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 6d1f622b9c069378cdb83088be2b15a9b480b8a3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107062516-failed-5.10-6d1f622b9c06@kernel.org' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Thanks,
Sasha

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

From 6d1f622b9c069378cdb83088be2b15a9b480b8a3 Mon Sep 17 00:00:00 2001
From: Seongjae Jeong <jsjlee1020@gmail.com>
Date: Wed, 14 Oct 2026 11:26:29 +0000
Subject: [PATCH] f2fs: fix submit accounting for IPU writeback

f2fs_write_cache_pages() uses the submitted count, which is set to
fio.submitted in f2fs_write_single_data_page(), to update nwritten
and decrement wbc->nr_to_write.

In the OPU path, f2fs_submit_page_write() sets fio->submitted to 1.
However, in the IPU path, fio->submitted is never set and remains zero.
As a result, successful IPU writes are not accounted for.
This can cause asynchronous writeback to continue beyond its budget.

Set fio->submitted in f2fs_inplace_write_data() after a page is
successfully merged into a bio or submitted, so that successful
IPU writes are included in the writeback accounting.

Cc: stable@kernel.org
Fixes: d68f735b3bc9 ("f2fs: check io submission more precisely")
Signed-off-by: Seongjae Jeong <jsjlee1020@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/segment.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f6e1cb1c0b71d..92c3f255ea8fa 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4292,6 +4292,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
 	else
 		err = f2fs_submit_page_bio(fio);
 	if (!err) {
+		fio->submitted = 1;
 		f2fs_update_device_state(fio->sbi, fio->ino,
 						fio->new_blkaddr, 1);
 		f2fs_update_iostat(fio->sbi, fio_inode(fio),
-- 
2.53.0