linux-kernel - Re: [PATCH] f2fs: fix to unlock page correctly in error path of is

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Date:   Thu, 3 Feb 2022 12:03:34 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Pavel Machek <pavel@...x.de>
Subject: Re: [PATCH] f2fs: fix to unlock page correctly in error path of
 is_alive()

On 02/03, Chao Yu wrote:
> As Pavel Machek reported in below link [1]:
> 
> After commit 77900c45ee5c ("f2fs: fix to do sanity check in is_alive()"),
> node page should be unlock via calling f2fs_put_page() in the error path
> of is_alive(), otherwise, f2fs may hang when it tries to lock the node
> page, fix it.
> 
> [1] https://lore.kernel.org/stable/20220124203637.GA19321@duo.ucw.cz/

Need -stable? It seems 4.19+?

> 
> Fixes: 77900c45ee5c ("f2fs: fix to do sanity check in is_alive()")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/gc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 0a6b0a8ae97e..2d53ef121e76 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -1038,8 +1038,10 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
>  		set_sbi_flag(sbi, SBI_NEED_FSCK);
>  	}
>  
> -	if (f2fs_check_nid_range(sbi, dni->ino))
> +	if (f2fs_check_nid_range(sbi, dni->ino)) {
> +		f2fs_put_page(node_page, 1);
>  		return false;
> +	}
>  
>  	*nofs = ofs_of_node(node_page);
>  	source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
> -- 
> 2.32.0