linux-kernel - Re: [PATCH 1/2] bcache: Remove redundant set

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Date:   Tue, 29 Nov 2016 12:49:16 -0800 (PST)
From:   Eric Wheeler <bcache@...ts.ewheeler.net>
To:     Yijing Wang <wangyijing@...wei.com>
cc:     axboe@...com, kent.overstreet@...il.com, git@...ux.ewheeler.net,
        colyli@...e.de, linux-bcache@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] bcache: Remove redundant set_capacity

On Fri, 25 Nov 2016, Yijing Wang wrote:

> set_capacity() has been called in bcache_device_init(),
> remove the redundant one.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  drivers/md/bcache/super.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 849ad44..b638a16 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -1126,9 +1126,6 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
>  	if (ret)
>  		return ret;
>  
> -	set_capacity(dc->disk.disk,
> -		     dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
> -

It probably is a duplicate set_capacity, but has anyone tested bringing on 
a writeback volume, and late-attaching the cache volume with this patch 
applied?

Otherwise stated, is it possible to get the backing device attached 
without setting the capacity?

-Eric

>  	dc->disk.disk->queue->backing_dev_info.ra_pages =
>  		max(dc->disk.disk->queue->backing_dev_info.ra_pages,
>  		    q->backing_dev_info.ra_pages);
> -- 
> 2.5.0
> 
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