linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix to avoid atomicity corruption of atomic file

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Message-ID: <CACOAw_xVx_xHV9iVspKYK_sRnNYeqv1Ldk1teWyE-vyUNF1-Sw@mail.gmail.com>
Date: Fri, 14 Mar 2025 12:04:50 -0700
From: Daeho Jeong <daeho43@...il.com>
To: Yeongjin Gil <youngjin.gil@...sung.com>
Cc: jaegeuk@...nel.org, chao@...nel.org, daehojeong@...gle.com, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	sj1557.seo@...sung.com
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to avoid atomicity corruption of
 atomic file

On Fri, Mar 14, 2025 at 5:28 AM Yeongjin Gil <youngjin.gil@...sung.com> wrote:
>
> In the case of the following call stack for an atomic file,
> FI_DIRTY_INODE is set, but FI_ATOMIC_DIRTIED is not subsequently set.
>
> f2fs_file_write_iter
>   f2fs_map_blocks
>     f2fs_reserve_new_blocks
>       inc_valid_block_count
>         __mark_inode_dirty(dquot)
>           f2fs_dirty_inode
>
> If FI_ATOMIC_DIRTIED is not set, atomic file can encounter corruption
> due to a mismatch between old file size and new data.
>
> To resolve this issue, I changed to set FI_ATOMIC_DIRTIED when
> FI_DIRTY_INODE is set. This ensures that FI_DIRTY_INODE, which was
> previously cleared by the Writeback thread during the commit atomic, is
> set and i_size is updated.
>
> Fixes: fccaa81de87e ("f2fs: prevent atomic file from being dirtied before commit")
> Reviewed-by: Sungjong Seo <sj1557.seo@...sung.com>
> Reviewed-by: Sunmin Jeong <s_min.jeong@...sung.com>
> Signed-off-by: Yeongjin Gil <youngjin.gil@...sung.com>
> ---
>  fs/f2fs/inode.c | 4 +---
>  fs/f2fs/super.c | 4 ++++
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index aa2f41696a88..83f862578fc8 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -34,10 +34,8 @@ void f2fs_mark_inode_dirty_sync(struct inode *inode, bool sync)
>         if (f2fs_inode_dirtied(inode, sync))
>                 return;
>
> -       if (f2fs_is_atomic_file(inode)) {
> -               set_inode_flag(inode, FI_ATOMIC_DIRTIED);
> +       if (f2fs_is_atomic_file(inode))
>                 return;
> -       }
>
>         mark_inode_dirty_sync(inode);
>  }
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 397df271885c..c08d52c6467a 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1534,6 +1534,10 @@ int f2fs_inode_dirtied(struct inode *inode, bool sync)
>                 inc_page_count(sbi, F2FS_DIRTY_IMETA);
>         }
>         spin_unlock(&sbi->inode_lock[DIRTY_META]);
> +
> +       if (!ret && f2fs_is_atomic_file(inode))
> +               set_inode_flag(inode, FI_ATOMIC_DIRTIED);
> +
>         return ret;
>  }
>
> --
> 2.34.1
>
>

Reviewed-by: Daeho Jeong <daehojeong@...gle.com>

Thanks!

>
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