linux-kernel - Re: [PATCH 1/2] f2fs: avoid duplicated code by reusing f2fs_read_end

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Date:	Tue, 19 May 2015 10:48:51 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <chao2.yu@...sung.com>
Cc:	Changman Lee <cm224.lee@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] f2fs: avoid duplicated code by reusing
 f2fs_read_end_io

Hi Chao,

On Tue, May 19, 2015 at 05:38:56PM +0800, Chao Yu wrote:
> This patch tries to clean up code as part code of f2fs_read_end_io
> and mpage_end_io are the same, so it's better to merge and reuse them.
> 
> Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> ---
>  fs/f2fs/data.c | 35 +++++------------------------------
>  1 file changed, 5 insertions(+), 30 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 8d04e24..5173d0f 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -34,40 +34,16 @@ static void f2fs_read_end_io(struct bio *bio, int err)
>  	struct bio_vec *bvec;
>  	int i;
>  
> -	bio_for_each_segment_all(bvec, bio, i) {
> -		struct page *page = bvec->bv_page;
> -
> -		if (!err) {
> -			SetPageUptodate(page);
> -		} else {
> -			ClearPageUptodate(page);
> -			SetPageError(page);
> -		}
> -		unlock_page(page);
> -	}
> -	bio_put(bio);
> -}
> -
> -/*
> - * I/O completion handler for multipage BIOs.
> - * copied from fs/mpage.c
> - */
> -static void mpage_end_io(struct bio *bio, int err)
> -{
> -	struct bio_vec *bv;
> -	int i;
> -
>  	if (f2fs_bio_encrypted(bio)) {
>  		if (err) {
>  			f2fs_release_crypto_ctx(bio->bi_private);
>  		} else {
> -			f2fs_end_io_crypto_work(bio->bi_private, bio);
> -			return;
> +			return f2fs_end_io_crypto_work(bio->bi_private, bio);

IMO, it'd better remain the previous one to make clear that
f2fs_en_io_crypto_work defines a void return.
How about that?

Thanks,

>  		}
>  	}
>  
> -	bio_for_each_segment_all(bv, bio, i) {
> -		struct page *page = bv->bv_page;
> +	bio_for_each_segment_all(bvec, bio, i) {
> +		struct page *page = bvec->bv_page;
>  
>  		if (!err) {
>  			SetPageUptodate(page);
> @@ -77,7 +53,6 @@ static void mpage_end_io(struct bio *bio, int err)
>  		}
>  		unlock_page(page);
>  	}
> -
>  	bio_put(bio);
>  }
>  
> @@ -122,7 +97,7 @@ static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
>  	bio->bi_bdev = sbi->sb->s_bdev;
>  	bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
>  	bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
> -	bio->bi_private = sbi;
> +	bio->bi_private = is_read ? NULL : sbi;
>  
>  	return bio;
>  }
> @@ -1584,7 +1559,7 @@ submit_and_realloc:
>  			}
>  			bio->bi_bdev = bdev;
>  			bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(block_nr);
> -			bio->bi_end_io = mpage_end_io;
> +			bio->bi_end_io = f2fs_read_end_io;
>  			bio->bi_private = ctx;
>  		}
>  
> -- 
> 2.3.3
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