linux-kernel - Re: [PATCH] OCFS2: remove useless err

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Message-ID: <2550e871-f930-92d1-4c75-fcd84fc20021@linux.alibaba.com>
Date:   Tue, 4 Feb 2020 19:34:05 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Mark Fasheh <mark@...heh.com>, Joel Becker <jlbec@...lplan.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        ChenGang <cg.chen@...wei.com>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] OCFS2: remove useless err



On 20/2/4 18:59, Alex Shi wrote:
> 
> 
> 在 2020/1/26 上午9:52, Joseph Qi 写道:
>>
> 
>>>  
>>> @@ -708,7 +708,7 @@ static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
>>>  				num++;
>>>  
>>>  				bh = NULL;
>>> -				err = ocfs2_read_dir_block(dir, b++, &bh,
>>> +				ocfs2_read_dir_block(dir, b++, &bh,
>>>  							   OCFS2_BH_READAHEAD);
>>
>> Umm... missing error checking here?
> 
> 
> /*
>  * This function forces all errors to -EIO for consistency with its
>  * predecessor, ocfs2_bread().  We haven't audited what returning the
>  * real error codes would do to callers.  We log the real codes with
>  * mlog_errno() before we squash them.
>  */
> static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
>                                 struct buffer_head **bh, int flags)
> 
> According to ocfs2_read_dir_block comments, caller don't care the err value, func will log it.
> 
> So is this patch ok? :)
> 
If we got error here, it means the buffer head is invalid.
So how about mark it as NULL and skip it?

Thanks,
Joseph