linux-kernel - Re: [PATCH] f2fs: assign write hint in direct write IO path

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Message-ID: <ZiKvg81HxG088cwm@google.com>
Date: Fri, 19 Apr 2024 17:53:07 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Hyunchul Lee <cheol.lee@....com>
Subject: Re: [PATCH] f2fs: assign write hint in direct write IO path

Thanks, Chao,

If you don't mind, can I merge this into my patch. Ok?

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@....com>
> Signed-off-by: Chao Yu <chao@...nel.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