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

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Message-ID: <5840C641.30904@huawei.com>
Date:   Fri, 2 Dec 2016 08:54:25 +0800
From:   wangyijing <wangyijing@...wei.com>
To:     Eric Wheeler <bcache@...ts.ewheeler.net>
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

>>> I want to make sure that the set_capacity call that happens on cache 
>>> attachment is not necessary when a backing device is attached without
>>
>> Hi Eric, set_capacity() which removed in this patch is happened at cached_dev_init()
>> which is called when register a backing device, what do you mean "set_capacity call that happens on cache
>>> attachment" ?
> 
> 
> I'm sorry, you are correct.  I though this was the cache-dev attachment, 
> not the cached-dev attachment.  Looks good.
> 
> Reviewed-by: Eric Wheeler <bcache@...ux.ewheeler.net>
> 

Thanks！

> --
> Eric Wheeler
> 
>>
>>
>>> its dirty writeback cache since bcache0 is not presented until the cache 
>>> attaches in that case.
>>
>> I found bcache0 device present once we do make-bcache -B /dev/nvme1n1. before attach the cache set.
>> So I missed something ?
>>
>>>
>>> Can you also unregister the volume, attach the backing device first, and 
>>> then the cache while the cache is dirty to make sure that the size is set 
>>> correctly?
>>
>> When I unregister the cache device, I found all the dirty data has been flushed to
>> backing device, so how can I do the test the case as you point ?
>>
>> Thanks!
>> Yijing.
>>
>>>
>>> --
>>> Eric Wheeler
>>>
>>>>
>>>>>
>>>>> -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
>>>>>>
>>>>>> --
>>>>>> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
>>>>>> the body of a message to majordomo@...r.kernel.org
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>>>>>>
>>>>>
>>>>> .
>>>>>
>>>>
>>>> --
>>>> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
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>>
>>
> 
> .
>