Date:	Fri, 20 Dec 2013 18:02:03 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	f2fs <linux-f2fs-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	fsdevel <linux-fsdevel@...r.kernel.org>,
	俞超 <chao2.yu@...sung.com>
Subject: Re: [f2fs-dev][PATCH v2] f2fs: move all the bio initialization into
 __bio_alloc

Hi,

2013-12-19 (목), 17:30 +0800, Gu Zheng:
> Move all the bio initialization into __bio_alloc, and some minor cleanups are
> also added.
> 
> v2:
>   Use 'is_read' rather than 'rw' as Yu Chao suggested.
>   Remove the needless initialization of bio->bi_private.
> 
> Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>
> ---
>  fs/f2fs/data.c |   92 +++++++++++++++++++++++++------------------------------
>  1 files changed, 42 insertions(+), 50 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 9bdacc6..701e6fc 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -24,20 +24,6 @@
>  #include "segment.h"
>  #include <trace/events/f2fs.h>
>  
> -/*
> - * Low-level block read/write IO operations.
> - */
> -static struct bio *__bio_alloc(struct block_device *bdev, int npages)
> -{
> -	struct bio *bio;
> -
> -	/* No failure on bio allocation */
> -	bio = bio_alloc(GFP_NOIO, npages);
> -	bio->bi_bdev = bdev;
> -	bio->bi_private = NULL;
> -	return bio;
> -}
> -
>  static void f2fs_read_end_io(struct bio *bio, int err)
>  {
>  	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
> @@ -93,6 +79,24 @@ static void f2fs_write_end_io(struct bio *bio, int err)
>  	bio_put(bio);
>  }
>  
> +/*
> + * Low-level block read/write IO operations.
> + */
> +static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
> +				int npages, int rw)

					bool is_read)

> +{
> +	struct bio *bio;
> +
> +	/* No failure on bio allocation */
> +	bio = bio_alloc(GFP_NOIO, npages);
> +
> +	bio->bi_bdev = sbi->sb->s_bdev;
> +	bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
> +	bio->bi_end_io = rw ? f2fs_read_end_io : f2fs_write_end_io;

			  is_read ? ---

> +
> +	return bio;
> +}
> +
>  static void __submit_merged_bio(struct f2fs_bio_info *io)
>  {
>  	struct f2fs_io_info *fio = &io->fio;
> @@ -104,25 +108,26 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
>  	rw = fio->rw | fio->rw_flag;
>  
>  	if (is_read_io(rw)) {
> -		trace_f2fs_submit_read_bio(io->sbi->sb, rw, fio->type, io->bio);
> +		trace_f2fs_submit_read_bio(io->sbi->sb, rw,
> +						fio->type, io->bio);
>  		submit_bio(rw, io->bio);
> -		io->bio = NULL;
> -		return;
> -	}
> -	trace_f2fs_submit_write_bio(io->sbi->sb, rw, fio->type, io->bio);
> -
> -	/*
> -	 * META_FLUSH is only from the checkpoint procedure, and we should wait
> -	 * this metadata bio for FS consistency.
> -	 */
> -	if (fio->type == META_FLUSH) {
> -		DECLARE_COMPLETION_ONSTACK(wait);
> -		io->bio->bi_private = &wait;
> -		submit_bio(rw, io->bio);
> -		wait_for_completion(&wait);
>  	} else {
> -		submit_bio(rw, io->bio);
> +		trace_f2fs_submit_write_bio(io->sbi->sb, rw,
> +						fio->type, io->bio);
> +		/*
> +		 * META_FLUSH is only from the checkpoint procedure, and we
> +		 * should wait this metadata bio for FS consistency.
> +		 */
> +		if (fio->type == META_FLUSH) {
> +			DECLARE_COMPLETION_ONSTACK(wait);
> +			io->bio->bi_private = &wait;
> +			submit_bio(rw, io->bio);
> +			wait_for_completion(&wait);
> +		} else {
> +			submit_bio(rw, io->bio);
> +		}
>  	}
> +
>  	io->bio = NULL;
>  }
>  
> @@ -152,17 +157,12 @@ void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
>  int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
>  					block_t blk_addr, int rw)
>  {
> -	struct block_device *bdev = sbi->sb->s_bdev;
>  	struct bio *bio;
>  
>  	trace_f2fs_submit_page_bio(page, blk_addr, rw);
>  
>  	/* Allocate a new bio */
> -	bio = __bio_alloc(bdev, 1);
> -
> -	/* Initialize the bio */
> -	bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
> -	bio->bi_end_io = is_read_io(rw) ? f2fs_read_end_io : f2fs_write_end_io;
> +	bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
>  
>  	if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
>  		bio_put(bio);
> @@ -178,17 +178,16 @@ void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
>  			block_t blk_addr, struct f2fs_io_info *fio)
>  {
>  	enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
> -	struct block_device *bdev = sbi->sb->s_bdev;
>  	struct f2fs_bio_info *io;
> -	int bio_blocks;
> +	int is_read = is_read_io(fio->rw);

	 bool is_read = is_read_io(fio->rw);

>  
> -	io = is_read_io(fio->rw) ? &sbi->read_io : &sbi->write_io[btype];
> +	io = is_read ? &sbi->read_io : &sbi->write_io[btype];
>  
>  	verify_block_addr(sbi, blk_addr);
>  
>  	mutex_lock(&io->io_mutex);
>  
> -	if (!is_read_io(fio->rw))
> +	if (!is_read)
>  		inc_page_count(sbi, F2FS_WRITEBACK);
>  
>  	if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
> @@ -196,17 +195,10 @@ void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
>  		__submit_merged_bio(io);
>  alloc_new:
>  	if (io->bio == NULL) {
> -		bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
> -		io->bio = __bio_alloc(bdev, bio_blocks);
> -		io->bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
> -		io->bio->bi_end_io = is_read_io(fio->rw) ? f2fs_read_end_io :
> -							f2fs_write_end_io;
> +		int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
> +
> +		io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
>  		io->fio = *fio;
> -		/*
> -		 * The end_io will be assigned at the sumbission phase.
> -		 * Until then, let bio_add_page() merge consecutive IOs as much
> -		 * as possible.
> -		 */
>  	}
>  
>  	if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <

-- 
Jaegeuk Kim
Samsung

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