linux-kernel - Re: [PATCH v2 3/4] f2fs: atomic: fix to truncate pagecache before on-disk metadata truncation

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Message-ID: <ZqfCwDcg7nvJPenf@google.com>
Date: Mon, 29 Jul 2024 16:26:40 +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 v2 3/4] f2fs: atomic: fix to truncate pagecache before
 on-disk metadata truncation

On 07/26, 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>
> ---
> v2:
> - fix to use cow_inode instead of inode
>  fs/f2fs/file.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 6c62f76474d1..54886ddcb8ab 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2202,6 +2202,7 @@ 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 */
> +		truncate_setsize(fi->cow_inode, 0);

What if the below truncation failed?

>  		ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
>  		if (ret) {
>  			f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
> -- 
> 2.40.1