linux-kernel - Re: [PATCH] erofs: fix error return code in erofs_fscache_meta_read_folio and erofs_fscache_read

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Date:   Mon, 15 Aug 2022 12:03:36 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Sun Ke <sunke32@...wei.com>
Cc:     xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        yinxin.x@...edance.com
Subject: Re: [PATCH] erofs: fix error return code in
 erofs_fscache_meta_read_folio and erofs_fscache_read_folio

On Mon, Aug 15, 2022 at 11:48:29AM +0800, Sun Ke wrote:
> If erofs_fscache_alloc_request fail and then goto out, it will return 0.
> it should return a negative error code instead of 0.
> 
> Fixes: d435d53228dd ("erofs: change to use asynchronous io for fscache readpage/readahead")
> Signed-off-by: Sun Ke <sunke32@...wei.com>

Thanks for the catch! Looks good to me,

Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Thanks,
Gao Xiang

> ---
>  fs/erofs/fscache.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
> index 8e01d89c3319..b5fd9d71e67f 100644
> --- a/fs/erofs/fscache.c
> +++ b/fs/erofs/fscache.c
> @@ -222,8 +222,10 @@ static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
>  
>  	rreq = erofs_fscache_alloc_request(folio_mapping(folio),
>  				folio_pos(folio), folio_size(folio));
> -	if (IS_ERR(rreq))
> +	if (IS_ERR(rreq)) {
> +		ret = PTR_ERR(rreq);
>  		goto out;
> +	}
>  
>  	return erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
>  				rreq, mdev.m_pa);
> @@ -301,8 +303,10 @@ static int erofs_fscache_read_folio(struct file *file, struct folio *folio)
>  
>  	rreq = erofs_fscache_alloc_request(folio_mapping(folio),
>  				folio_pos(folio), folio_size(folio));
> -	if (IS_ERR(rreq))
> +	if (IS_ERR(rreq)) {
> +		ret = PTR_ERR(rreq);
>  		goto out_unlock;
> +	}
>  
>  	pstart = mdev.m_pa + (pos - map.m_la);
>  	return erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
> -- 
> 2.31.1