[PATCH 5.10.y 4/4] f2fs: fix submit accounting for IPU writeback

[Sasha Levin <sashal@kernel.org>]

From: Seongjae Jeong <jsjlee1020@gmail.com>

[ Upstream commit 6d1f622b9c069378cdb83088be2b15a9b480b8a3 ]

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>
[ sashal: Adjusted context to preserve the older device-state and I/O-statistics calls. ]
Signed-off-by: Sasha Levin <sashal@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 fec3b4a9e9542..4d759917c2849 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3563,6 +3563,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
 	else
 		err = f2fs_submit_page_bio(fio);
 	if (!err) {
+		fio->submitted = 1;
 		update_device_state(fio);
 		f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
 	}
-- 
2.53.0