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SubjectRe: [PATCH] f2fs: compress: remove unneed check condition
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On 2021/4/25 8:47, Jaegeuk Kim wrote:
> On 04/22, Chao Yu wrote:
>> On 2021/4/22 12:04, Jaegeuk Kim wrote:
>>> On 04/21, Chao Yu wrote:
>>>> In only call path of __cluster_may_compress(), __f2fs_write_data_pages()
>>>> has checked SBI_POR_DOING condition, and also cluster_may_compress()
>>>> has checked CP_ERROR_FLAG condition, so remove redundant check condition
>>>> in __cluster_may_compress() for cleanup.
>>>
>>> I think cp_error can get any time without synchronization. Is it safe to say
>>> it's redundant?
>>
>> Yes,
>>
>> But no matter how late we check cp_error, cp_error can happen after our
>> check points, it won't cause regression if we remove cp_error check there,
>> because for compress write, it uses OPU, it won't overwrite any existed data
>> in device.
>>
>> Seems it will be more appropriate to check cp_error in
>> f2fs_write_compressed_pages() like we did in f2fs_write_single_data_page()
>> rather than in __cluster_may_compress().
>>
>> BTW, shouldn't we rename __cluster_may_compress() to
>> cluster_beyond_filesize() for better readability?
>
> f2fs_cluster_has_data()?

Maybe cluster_has_invalid_data()? which indicates there is invalid data
beyond filesize.

Thanks,

>
>>
>> Thanks,
>>
>>>
>>>>
>>>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>>>> ---
>>>> fs/f2fs/compress.c | 5 -----
>>>> 1 file changed, 5 deletions(-)
>>>>
>>>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>>>> index 3c9d797dbdd6..532c311e3a89 100644
>>>> --- a/fs/f2fs/compress.c
>>>> +++ b/fs/f2fs/compress.c
>>>> @@ -906,11 +906,6 @@ static bool __cluster_may_compress(struct compress_ctx *cc)
>>>> f2fs_bug_on(sbi, !page);
>>>> - if (unlikely(f2fs_cp_error(sbi)))
>>>> - return false;
>>>> - if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
>>>> - return false;
>>>> -
>>>> /* beyond EOF */
>>>> if (page->index >= nr_pages)
>>>> return false;
>>>> --
>>>> 2.29.2
>>> .
>>>
> .
>

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