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: <69dc5ab6-542d-dcc2-f4ec-0a6a8e49b937@huaweicloud.com>
Date: Mon, 12 May 2025 21:36:43 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Christoph Hellwig <hch@....de>, Yu Kuai <yukuai1@...weicloud.com>
Cc: 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

Hi,

在 2025/05/12 21:30, Christoph Hellwig 写道:
> 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?

I think this can work, and this can also improve performance. I'll look
into this.

Thanks,
Kuai

> 
> .
>