linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: return error number for quota

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Message-ID: <79d07284-167a-3b12-bed3-cea138ab4eb7@kernel.org>
Date:   Tue, 17 Oct 2017 21:12:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: return error number for quota_write



On 2017/10/17 7:04, Jaegeuk Kim wrote:
> On 10/16, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> On 2017/10/13 7:15, Jaegeuk Kim wrote:
>>> This patch returns an error number to quota_write in order for quota to handle
>>> it correctly.
>>
>> We should return error number like __generic_file_write_iter, right? it
>> needs to return written bytes if we have written one page or more, otherwise
>> return error number feedbacked from write_begin.
>>
>> So how about reverting 4f31d26b0c17 ("f2fs: return wrong error number on
>> f2fs_quota_write")?
> 
> I thought like that, but realized the code change is somewhat different between
> them.

Hmm... main structure of codes here is copied from other file systems, is there
the same problem in *_quota_write of other file systems?

BTW, it looks making below judgment condition being useless.

	if (len == towrite)
		return 0;

Thanks,

> 
> Thanks,
> 
>>
>> Thanks,
>>
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>>  fs/f2fs/super.c | 5 ++++-
>>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index 2feecf5e7f4c..840a0876005b 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -1397,8 +1397,11 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type,
>>>  
>>>  		err = a_ops->write_begin(NULL, mapping, off, tocopy, 0,
>>>  							&page, NULL);
>>> -		if (unlikely(err))
>>> +		if (unlikely(err)) {
>>> +			if (len == towrite)
>>> +				return err;
>>>  			break;
>>> +		}
>>>  
>>>  		kaddr = kmap_atomic(page);
>>>  		memcpy(kaddr + offset, data, tocopy);
>>>
> 
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