[PATCH] f2fs: fix submit accounting for IPU writeback

[PATCH] f2fs: fix submit accounting for IPU writeback

[Seongjae Jeong]

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.

Signed-off-by: Seongjae Jeong <jsjlee1020@gmail.com>
---
 fs/f2fs/segment.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 453f9284ec86..2e19124f1463 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4298,6 +4298,7 @@ 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

Re: [PATCH] f2fs: fix submit accounting for IPU writeback

[Chao Yu]

On 10/14/26 19:26, Seongjae Jeong wrote:
> 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.
> 

Missing Fixes and Cc stable line?

> Signed-off-by: Seongjae Jeong <jsjlee1020@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,

Re: [f2fs-dev] [PATCH] f2fs: fix submit accounting for IPU writeback

[Jaegeuk Kim]

On 10/19, Chao Yu via Linux-f2fs-devel wrote:
> On 10/14/26 19:26, Seongjae Jeong wrote:
> > 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.
> > 
> 
> Missing Fixes and Cc stable line?

    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>
> 
> Thanks,
> 
> 
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

Re: [f2fs-dev] [PATCH] f2fs: fix submit accounting for IPU writeback

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Wed, 14 Oct 2026 11:26:29 +0000 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: fix submit accounting for IPU writeback
    https://git.kernel.org/jaegeuk/f2fs/c/6d1f622b9c06

You are awesome, thank you!
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