linux-kernel - Re: [PATCH v2 2/9] block: introduce blk_init

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Message-ID: <CACVXFVPAVGZEpkfX551RSOGV71CkdQO6npkyAoNmZMqze01iQw@mail.gmail.com>
Date:	Fri, 12 Sep 2014 23:59:23 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 2/9] block: introduce blk_init_flush and its pair

On Fri, Sep 12, 2014 at 11:45 PM, Jens Axboe <axboe@...nel.dk> wrote:
> On 2014-09-12 09:41, Ming Lei wrote:
>>
>> On Fri, Sep 12, 2014 at 11:18 PM, Jens Axboe <axboe@...nel.dk> wrote:
>>>
>>> On 2014-09-12 08:47, Ming Lei wrote:
>>>>
>>>>
>>>> These two functions are introduced to initialize and de-initialize
>>>> flush stuff centrally.
>>>
>>>
>>>
>>> I know you said these change later to more proper naming, but that only
>>> happens further down. Lets get rid of these wrappers and just call
>>> blk_alloc_flush_queue() directly.
>>
>>
>> It is too early to call blk_alloc_flush_queue() because flush queue
>> doesn't
>> come until patch 5 appears, :-)  And I think it is cleaner to put
>> flush initialization
>> stuff together first, then introduce flush_queue.
>
>
> Then do it later. Fact is, final result still looks like this in
> blk_mq_init_queue():
>
> if (blk_init_flush(q))
>     ...
>
> where it would be cleaner as just assigning q->fq. My previous (and
> existing) point is that you have no idea what this init_flush() function
> does without jumping in and reading it.

That is a good point, and we can change to call blk_alloc_flush_queue()
directly in patch 5.

Thanks,
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