On 2017/10/18 2:17, Jaegeuk Kim wrote:
> On 10/17, Chao Yu wrote:
>>
>>
>> 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;
>
> We need this to avoid needless inode updates. :P
For err = 0 and len == towrite case, it more likes a bug of quota that passing
0 in @len.
:(, Oh, still didn't get that why there is difference in between reverting and
this fixing. Can you please explain more about this?
Thanks,
>
> Thanks,
>
>>
>> Thanks,
>>
>>>
>>> Thanks,
>>>
>>>>
>>>> Thanks,
>>>>
>>>>>
>>>>> Signed-off-by: Jaegeuk Kim <jaeg...@kernel.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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>
> .
>
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