linux-kernel - Re: [PATCH RFC md-6.16 v3 05/19] md: delay registration of bitmap

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Message-ID: <20250512045306.GE868@lst.de>
Date: Mon, 12 May 2025 06:53:06 +0200
From: Christoph Hellwig <hch@....de>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: hch@....de, xni@...hat.com, colyli@...nel.org, agk@...hat.com,
	snitzer@...nel.org, mpatocka@...hat.com, song@...nel.org,
	yukuai3@...wei.com, linux-kernel@...r.kernel.org,
	dm-devel@...ts.linux.dev, linux-raid@...r.kernel.org,
	yi.zhang@...wei.com, yangerkun@...wei.com, johnny.chenyi@...wei.com
Subject: Re: [PATCH RFC md-6.16 v3 05/19] md: delay registration of
 bitmap_ops until creating bitmap

> +	head = xa_load(&md_submodule, mddev->bitmap_id);
>  	xa_unlock(&md_submodule);
> -	if (!mddev->bitmap_ops)
> -		pr_warn_once("md: can't find bitmap id %d\n", mddev->bitmap_id);
> +
> +	if (WARN_ON_ONCE(!head || head->type != MD_BITMAP)) {
> +		pr_err("md: can't find bitmap id %d\n", mddev->bitmap_id);
> +		return;
> +	}

This needs a real error return, doesn't it?