linux-kernel - Re: [PATCH] md: make md_flush

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Message-ID: <143ec153-fe71-7a03-a10a-589ecd63eb71@huaweicloud.com>
Date: Tue, 28 May 2024 10:06:16 +0800
From: Li Nan <linan666@...weicloud.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: song@...nel.org, linux-raid@...r.kernel.org,
 linux-kernel@...r.kernel.org, yukuai3@...wei.com, yi.zhang@...wei.com,
 houtao1@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH] md: make md_flush_request() more readable



在 2024/5/26 16:54, Christoph Hellwig 写道:
> On Sun, May 26, 2024 at 02:56:22AM +0800, linan666@...weicloud.com wrote:
>> -		bio = NULL;
>> -	}
>> -	spin_unlock_irq(&mddev->lock);
>> -
>> -	if (!bio) {
>> +		spin_unlock_irq(&mddev->lock);
>>   		INIT_WORK(&mddev->flush_work, submit_flushes);
>>   		queue_work(md_wq, &mddev->flush_work);
>>   	} else {
>>   		/* flush was performed for some other bio while we waited. */
>> +		spin_unlock_irq(&mddev->lock);
>>   		if (bio->bi_iter.bi_size == 0)
>>   			/* an empty barrier - all done */
> 
> This stil looks like a somwwhat odd flow  Why not go all the way
> and turn it into:
> 
> 
> 	...
> 		queue_work(md_wq, &mddev->flush_work);
> 		return true;
> 	}
> 
> 	/* flush was performed for some other bio while we waited. */
> 	spin_unlock_irq(&mddev->lock);
> 	if (bio->bi_iter.bi_size == 0) {
> 		/* pure flush without data - all done */
> 		bio_endio(bio);
> 		return true;
> 	}
> 	bio->bi_opf &= ~REQ_PREFLUSH;
> 	return false;
> }

Yeah, it looks better. I will changed it in v2.

Thansk for your suggestion.

-- 
Thanks,
Nan