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Subject: Re: [PATCH] OCFS2: remove useless err
To:     Alex Shi <alex.shi@linux.alibaba.com>
Cc:     Mark Fasheh <mark@fasheh.com>, Joel Becker <jlbec@evilplan.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        ChenGang <cg.chen@huawei.com>,
        Richard Fontana <rfontana@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        ocfs2-devel@oss.oracle.com, linux-kernel@vger.kernel.org
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 <f5c1b5cd-6fd2-f198-97e3-a4f34e990ba8@linux.alibaba.com>
From:   Joseph Qi <joseph.qi@linux.alibaba.com>
Message-ID: <2550e871-f930-92d1-4c75-fcd84fc20021@linux.alibaba.com>
Date:   Tue, 4 Feb 2020 19:34:05 +0800
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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