linux-kernel - Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

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Date:   Mon, 13 Jan 2020 16:56:00 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

On 2020/1/12 2:02, Jaegeuk Kim wrote:
> On 01/11, Chao Yu wrote:
>> On 2020/1/11 7:52, Jaegeuk Kim wrote:
>>> On 01/06, Jaegeuk Kim wrote:
>>>> On 01/06, Chao Yu wrote:
>>>>> On 2020/1/3 14:50, Chao Yu wrote:
>>>>>> This works to me. Could you run fsstress tests on compressed root directory?
>>>>>> It seems still there are some bugs.
>>>>>
>>>>> Jaegeuk,
>>>>>
>>>>> Did you mean running por_fsstress testcase?
>>>>>
>>>>> Now, at least I didn't hit any problem for normal fsstress case.
>>>>
>>>> Yup. por_fsstress
>>>
>>> Please check https://github.com/jaegeuk/f2fs/commits/g-dev-test.
>>> I've fixed
>>> - truncation offset
>>> - i_compressed_blocks and its lock coverage
>>> - error handling
>>> - etc
>>
>> I changed as below, and por_fsstress stops panic the system.
>>
>> Could you merge all these fixes into original patch?
> 
> Yup, let m roll up some early patches first once test results become good.

I didn't encounter issue any more, how about por_fsstress test result in your
enviornment? If there is, please share the call stack with me.

Thanks,

> 
>>
>> >From bb17d7d77fe0b8a3e3632a7026550800ab9609e9 Mon Sep 17 00:00:00 2001
>> From: Chao Yu <yuchao0@...wei.com>
>> Date: Sat, 11 Jan 2020 16:58:20 +0800
>> Subject: [PATCH] f2fs: compress: fix f2fs_put_rpages_mapping()
>>
>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>> ---
>>  fs/f2fs/compress.c | 30 +++++++++++++++---------------
>>  1 file changed, 15 insertions(+), 15 deletions(-)
>>
>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>> index 502cd0ddc2a7..5c6a31d84ce4 100644
>> --- a/fs/f2fs/compress.c
>> +++ b/fs/f2fs/compress.c
>> @@ -74,18 +74,10 @@ static void f2fs_put_compressed_page(struct page *page)
>>  }
>>
>>  static void f2fs_drop_rpages(struct compress_ctx *cc,
>> -		struct address_space *mapping, int len, bool unlock)
>> +					int len, bool unlock)
>>  {
>>  	unsigned int i;
>>  	for (i = 0; i < len; i++) {
>> -		if (mapping) {
>> -			pgoff_t start = start_idx_of_cluster(cc);
>> -			struct page *page = find_get_page(mapping, start + i);
>> -
>> -			put_page(page);
>> -			put_page(page);
>> -			cc->rpages[i] = NULL;
>> -		}
>>  		if (!cc->rpages[i])
>>  			continue;
>>  		if (unlock)
>> @@ -97,18 +89,25 @@ static void f2fs_drop_rpages(struct compress_ctx *cc,
>>
>>  static void f2fs_put_rpages(struct compress_ctx *cc)
>>  {
>> -	f2fs_drop_rpages(cc, NULL, cc->cluster_size, false);
>> +	f2fs_drop_rpages(cc, cc->cluster_size, false);
>>  }
>>
>>  static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
>>  {
>> -	f2fs_drop_rpages(cc, NULL, len, true);
>> +	f2fs_drop_rpages(cc, len, true);
>>  }
>>
>>  static void f2fs_put_rpages_mapping(struct compress_ctx *cc,
>> -				struct address_space *mapping, int len)
>> +				struct address_space *mapping,
>> +				pgoff_t start, int len)
>>  {
>> -	f2fs_drop_rpages(cc, mapping, len, false);
>> +	int i;
>> +	for (i = 0; i < len; i++) {
>> +		struct page *page = find_get_page(mapping, start + i);
>> +
>> +		put_page(page);
>> +		put_page(page);
>> +	}
>>  }
>>
>>  static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
>> @@ -680,7 +679,8 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>>
>>  		if (!PageUptodate(page)) {
>>  			f2fs_unlock_rpages(cc, i + 1);
>> -			f2fs_put_rpages_mapping(cc, mapping, cc->cluster_size);
>> +			f2fs_put_rpages_mapping(cc, mapping, start_idx,
>> +					cc->cluster_size);
>>  			f2fs_destroy_compress_ctx(cc);
>>  			goto retry;
>>  		}
>> @@ -714,7 +714,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>>  unlock_pages:
>>  	f2fs_unlock_rpages(cc, i);
>>  release_pages:
>> -	f2fs_put_rpages_mapping(cc, mapping, i);
>> +	f2fs_put_rpages_mapping(cc, mapping, start_idx, i);
>>  	f2fs_destroy_compress_ctx(cc);
>>  	return ret;
>>  }
>> -- 
>> 2.18.0.rc1
>>
>>
>>
>>>
>>> One another fix in f2fs-tools as well.
>>> https://github.com/jaegeuk/f2fs-tools
>>>
>>>>
>>>>>
>>>>> Thanks,
>>> .
>>>
> .
>