linux-kernel - Re: [PATCH v3 3/4] f2fs: atomic: fix to truncate pagecache before on-disk metadata truncation

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Message-ID: <ZrGN3ed4pN5Ii67m@google.com>
Date: Tue, 6 Aug 2024 02:43:41 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] f2fs: atomic: fix to truncate pagecache before
 on-disk metadata truncation

On 08/01, Chao Yu wrote:
> We should always truncate pagecache while truncating on-disk data.
> 
> Fixes: a46bebd502fe ("f2fs: synchronize atomic write aborts")
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> v3:
> - check dirty page before truncation
> - use invalidate_mapping_pages() instead of truncate_inode_pages()
> - set i_size to zero after truncation
>  fs/f2fs/file.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index ac61c88f7688..a316c21539d1 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2199,11 +2199,17 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
>  		F2FS_I(fi->cow_inode)->atomic_inode = inode;
>  	} else {
>  		/* Reuse the already created COW inode */
> +		f2fs_bug_on(sbi, get_dirty_pages(fi->cow_inode));
> +
> +		invalidate_mapping_pages(fi->cow_inode->i_mapping, 0, -1);
> +
>  		ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
>  		if (ret) {
>  			f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
>  			goto out;
>  		}
> +
> +		i_size_write(fi->cow_inode, 0);

Do we really need this?

>  	}
>  
>  	f2fs_write_inode(inode, NULL);
> -- 
> 2.40.1