linux-ext4 - Re: [PATCH v2 2/2] ext2: ext2_find_entry() return -ENOENT if no entry found

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Date:   Fri, 5 Jun 2020 17:11:00 +0200
From:   Jan Kara <jack@...e.cz>
To:     "zhangyi (F)" <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, jack@...e.cz
Subject: Re: [PATCH v2 2/2] ext2: ext2_find_entry() return -ENOENT if no
 entry found

On Wed 03-06-20 14:35:14, zhangyi (F) wrote:
> Almost all callers of ext2_find_entry() transform NULL return value to
> -ENOENT, so just let ext2_find_entry() retuen -ENOENT instead of NULL
> if no valid entry found, and also switch to check the return value of
> ext2_inode_by_name() in ext2_lookup() and ext2_get_parent().
> 
> Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
> Suggested-by: Jan Kara <jack@...e.cz>

Thanks for the patch. Just one small nit below.

> @@ -419,11 +419,16 @@ int ext2_inode_by_name(struct inode *dir, const struct qstr *child, ino_t *ino)
>  	struct page *page;
>  	
>  	de = ext2_find_entry(dir, child, &page);
> -	if (IS_ERR_OR_NULL(de))
> +	if (IS_ERR(de))
>  		return PTR_ERR(de);
>  
> -	*ino = le32_to_cpu(de->inode);
>  	ext2_put_page(page);
> +	if (!de->inode) {

ext2_find_entry() will not ever return de with de->inode == 0 because
ext2_match() never returns true for such entries. So I'd just remove this
condition...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR