linux-kernel - Re: [RESEND PATCH 1/3] bcache: Remove redundant parameter for cache

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Date:	Fri, 1 Jul 2016 12:24:46 +0800
From:	Coly Li <colyli@...e.de>
To:	wangyijing <wangyijing@...wei.com>, Coly Li <i@...y.li>,
	axboe@...com, Kent Overstreet <kent.overstreet@...il.com>
Cc:	Eric Wheeler <git@...ux.ewheeler.net>,
	linux-bcache@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH 1/3] bcache: Remove redundant parameter for
 cache_alloc()

在 16/7/1 上午10:09, wangyijing 写道:
> 
> 
> 在 2016/6/29 18:20, Coly Li 写道:
>> 在 16/6/22 上午10:10, Yijing Wang 写道:
>>> Cache_sb is not used in cache_alloc, and we have copied
>>> sb info to cache->sb already, remove it.
>>>
>>> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
>>> ---
>>>  drivers/md/bcache/super.c |    4 ++--
>>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
>>> index f5dbb4e..aecaace 100644
>>> --- a/drivers/md/bcache/super.c
>>> +++ b/drivers/md/bcache/super.c
>>> @@ -1803,7 +1803,7 @@ void bch_cache_release(struct kobject *kobj)
>>>  	module_put(THIS_MODULE);
>>>  }
>>>  
>>> -static int cache_alloc(struct cache_sb *sb, struct cache *ca)
>>> +static int cache_alloc(struct cache *ca)
>>>  {
>>>  	size_t free;
>>>  	struct bucket *b;
>>> @@ -1858,7 +1858,7 @@ static int register_cache(struct cache_sb *sb, struct page *sb_page,
>>>  	if (blk_queue_discard(bdev_get_queue(ca->bdev)))
>>>  		ca->discard = CACHE_DISCARD(&ca->sb);
>>>  
>>> -	ret = cache_alloc(sb, ca);
>>> +	ret = cache_alloc(ca);
>>
>> I am not sure whether struct cache_b *sb will be used in future, I
>> suggest to let it be for now.
>>
> 
> We have copied sb to ca->sb, so if we need sb info in future, we could get info from ca->sb.
> 

Hi Yijing,

Your point makes sense, please add
	Reviewed-by: Coly Li <colyli@...e.de>
in your patch, if you don't mind :-)

Thanks for your interpretation.

Coly