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

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Date: Sun, 26 May 2024 01:54:07 -0700
From: Christoph Hellwig <hch@...radead.org>
To: linan666@...weicloud.com
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

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;
}