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Date: Sat, 20 Apr 2024 10:29:26 +0800
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Subject: Re: [PATCH] f2fs: assign write hint in direct write IO path
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
 Hyunchul Lee <cheol.lee@lge.com>
References: <20240418033334.861570-1-chao@kernel.org>
 <ZiKvg81HxG088cwm@google.com>
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From: Chao Yu <chao@kernel.org>
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On 2024/4/20 1:53, Jaegeuk Kim wrote:
> Thanks, Chao,
> 
> If you don't mind, can I merge this into my patch. Ok?

No problem. :)

Thanks,

> 
> On 04/18, Chao Yu wrote:
>> f2fs has its own write_hint policy, let's assign write hint for
>> direct write bio.
>>
>> Cc: Hyunchul Lee <cheol.lee@lge.com>
>> Signed-off-by: Chao Yu <chao@kernel.org>
>> ---
>>   fs/f2fs/f2fs.h    |  1 +
>>   fs/f2fs/file.c    | 15 ++++++++++++++-
>>   fs/f2fs/segment.c | 17 +++++++++++------
>>   3 files changed, 26 insertions(+), 7 deletions(-)
>>
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index b3b878acc86b..3f7196122574 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -3722,6 +3722,7 @@ void f2fs_replace_block(struct f2fs_sb_info *sbi, struct dnode_of_data *dn,
>>   			block_t old_addr, block_t new_addr,
>>   			unsigned char version, bool recover_curseg,
>>   			bool recover_newaddr);
>> +int f2fs_get_segment_temp(int seg_type);
>>   int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
>>   			block_t old_blkaddr, block_t *new_blkaddr,
>>   			struct f2fs_summary *sum, int type,
>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>> index ac1ae85f3cc3..d382f8bc2fbe 100644
>> --- a/fs/f2fs/file.c
>> +++ b/fs/f2fs/file.c
>> @@ -4685,8 +4685,21 @@ static int f2fs_dio_write_end_io(struct kiocb *iocb, ssize_t size, int error,
>>   	return 0;
>>   }
>>   
>> +static void f2fs_dio_write_submit_io(const struct iomap_iter *iter,
>> +					struct bio *bio, loff_t file_offset)
>> +{
>> +	struct inode *inode = iter->inode;
>> +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> +	int seg_type = f2fs_rw_hint_to_seg_type(inode->i_write_hint);
>> +	enum temp_type temp = f2fs_get_segment_temp(seg_type);
>> +
>> +	bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, DATA, temp);
>> +	submit_bio(bio);
>> +}
>> +
>>   static const struct iomap_dio_ops f2fs_iomap_dio_write_ops = {
>> -	.end_io = f2fs_dio_write_end_io,
>> +	.end_io		= f2fs_dio_write_end_io,
>> +	.submit_io	= f2fs_dio_write_submit_io,
>>   };
>>   
>>   static void f2fs_flush_buffered_write(struct address_space *mapping,
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index daa94669f7ee..2206199e8099 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -3502,6 +3502,15 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
>>   	}
>>   }
>>   
>> +int f2fs_get_segment_temp(int seg_type)
>> +{
>> +	if (IS_HOT(seg_type))
>> +		return HOT;
>> +	else if (IS_WARM(seg_type))
>> +		return WARM;
>> +	return COLD;
>> +}
>> +
>>   static int __get_segment_type(struct f2fs_io_info *fio)
>>   {
>>   	int type = 0;
>> @@ -3520,12 +3529,8 @@ static int __get_segment_type(struct f2fs_io_info *fio)
>>   		f2fs_bug_on(fio->sbi, true);
>>   	}
>>   
>> -	if (IS_HOT(type))
>> -		fio->temp = HOT;
>> -	else if (IS_WARM(type))
>> -		fio->temp = WARM;
>> -	else
>> -		fio->temp = COLD;
>> +	fio->temp = f2fs_get_segment_temp(type);
>> +
>>   	return type;
>>   }
>>   
>> -- 
>> 2.40.1