linux-kernel - Re: [PATCH RFC md-6.16 v3 15/19] md/md-llbitmap: implement APIs to dirty bits and clear bits

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Message-ID: <20250512133048.GA32562@lst.de>
Date: Mon, 12 May 2025 15:30:48 +0200
From: Christoph Hellwig <hch@....de>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Christoph Hellwig <hch@....de>, xni@...hat.com, colyli@...nel.org,
	agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com,
	song@...nel.org, 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,
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC md-6.16 v3 15/19] md/md-llbitmap: implement APIs to
 dirty bits and clear bits

On Mon, May 12, 2025 at 03:26:41PM +0200, Christoph Hellwig wrote:
> > 1) bitmap bio must be done before this bio can be issued;
> > 2) bitmap bio will be added to current->bio_list, and wait for this bio
> > to be issued;
> >
> > Do you have a better sulution to this problem?
> 
> A bew block layer API that bypasses bio_list maybe?  I.e. export
> __submit_bio with a better name and a kerneldoc detailing the narrow
> use case.

That won't work as we'd miss a lot of checks, cgroup handling, etc.

But maybe a flag to skip the recursion avoidance?