linux-kernel - Re: [PATCH v2] staging: erofs: fix an error handling in erofs

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Date:   Sat, 17 Aug 2019 19:20:55 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Gao Xiang <hsiangkao@....com>
Cc:     Chao Yu <yuchao0@...wei.com>, Richard Weinberger <richard@....at>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-fsdevel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-erofs@...ts.ozlabs.org, Chao Yu <chao@...nel.org>,
        Miao Xie <miaoxie@...wei.com>, Fang Wei <fangwei1@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] staging: erofs: fix an error handling in
 erofs_readdir()

On Sun, Aug 18, 2019 at 09:56:31AM +0800, Gao Xiang wrote:
> @@ -82,8 +82,12 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
>  		unsigned int nameoff, maxsize;
>  
>  		dentry_page = read_mapping_page(mapping, i, NULL);
> -		if (IS_ERR(dentry_page))
> -			continue;
> +		if (IS_ERR(dentry_page)) {
> +			errln("fail to readdir of logical block %u of nid %llu",
> +			      i, EROFS_V(dir)->nid);
> +			err = PTR_ERR(dentry_page);
> +			break;

I don't think you want to use the errno that came back from
read_mapping_page() (which is, I think, always going to be -EIO).
Rather you want -EFSCORRUPTED, at least if I understand the recent
patches to ext2/ext4/f2fs/xfs/...