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

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Date:	Fri, 12 Sep 2014 09:45:15 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Ming Lei <ming.lei@...onical.com>
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 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.


-- 
Jens Axboe

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