linux-kernel - Re: [PATCH 1/2] f2fs: fix to remove f2fs_bug_on in add_bio

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Date: Mon, 11 Mar 2024 11:54:01 +0800
From: Chao Yu <chao@...nel.org>
To: Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
 niuzhiguo84@...il.com, ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH 1/2] f2fs: fix to remove f2fs_bug_on in add_bio_entry

On 2024/3/8 18:12, Zhiguo Niu wrote:
> add_bio_entry should not trigger system panic when bio_add_page fail,
> fix to remove it.
> 
> Fixes: 0b20fcec8651 ("f2fs: cache global IPU bio")
> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> ---
>   fs/f2fs/data.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index d9494b5..f8ae684 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -759,8 +759,10 @@ static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio,
>   	be->bio = bio;
>   	bio_get(bio);
>   
> -	if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE)
> -		f2fs_bug_on(sbi, 1);
> +	if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
> +		bio_put(bio);

I didn't get it, why new created bio has no space to store one page?

Thanks,

> +		return;
> +	}
>   
>   	f2fs_down_write(&io->bio_list_lock);
>   	list_add_tail(&be->list, &io->bio_list);