linux-kernel - Re: [PATCH] block: submit_bio

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Date:	Sun, 24 Nov 2013 15:24:03 +1100
From:	NeilBrown <neilb@...e.de>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Joern Engel <joern@...fs.org>,
	Prasad Joshi <prasadjoshi.linux@...il.com>,
	Chris Mason <chris.mason@...ionio.com>
Subject: Re: [PATCH] block: submit_bio_wait() conversions

On Sat, 23 Nov 2013 20:03:30 -0800 Kent Overstreet <kmo@...erainc.com> wrote:

> It was being open coded in a few places.
> 
> Signed-off-by: Kent Overstreet <kmo@...erainc.com>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Joern Engel <joern@...fs.org>
> Cc: Prasad Joshi <prasadjoshi.linux@...il.com>
> Cc: Neil Brown <neilb@...e.de>
> Cc: Chris Mason <chris.mason@...ionio.com>

Acked-by: NeilBrown <neilb@...e.de>

for the drivers/md/md.c bits, however...

> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index b6b7a28..8700de3 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -776,16 +776,10 @@ void md_super_wait(struct mddev *mddev)
>  	finish_wait(&mddev->sb_wait, &wq);
>  }
>  
> -static void bi_complete(struct bio *bio, int error)
> -{
> -	complete((struct completion*)bio->bi_private);
> -}
> -
>  int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
>  		 struct page *page, int rw, bool metadata_op)
>  {
>  	struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
> -	struct completion event;
>  	int ret;
>  
>  	rw |= REQ_SYNC;
        ^^^^^^^^^^^^^^^

you could remove this line as well, as submit_bio_wait sets this flag for us.


> @@ -801,11 +795,7 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
>  	else
>  		bio->bi_sector = sector + rdev->data_offset;
>  	bio_add_page(bio, page, size, 0);
> -	init_completion(&event);
> -	bio->bi_private = &event;
> -	bio->bi_end_io = bi_complete;
> -	submit_bio(rw, bio);
> -	wait_for_completion(&event);
> +	submit_bio_wait(rw, bio);
>  
>  	ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
>  	bio_put(bio);

Thanks,
NeilBrown

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