linux-kernel - Re: [PATCH 06/23] md/md-bitmap: add a new sysfs api bitmap

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Message-ID: <0e527b24-3980-2126-67f0-0958f2bc3789@huaweicloud.com>
Date: Mon, 26 May 2025 09:13:48 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Xiao Ni <xni@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc: hch@....de, colyli@...nel.org, song@...nel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 johnny.chenyi@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 06/23] md/md-bitmap: add a new sysfs api bitmap_type

Hi,

在 2025/05/26 0:32, Xiao Ni 写道:
>> The api will be used by mdadm to set bitmap_ops while creating new array
> Hi Kuai
> 
> Maybe you want to say "set bitmap type" here? And can you explain more
> here, why does it need this sys file while creating a new array? The
> reason I ask is that it doesn't use a sys file when creating an array
> with bitmap.

I do mean mddev->bitmap_ops here, this is the same as mddev->pers and
the md/level api. The mdadm patch will write the new helper before
running array.
> 
> And if it really needs this, can this be gotten by superblock?

Theoretically, I can, however, the bitmap superblock is read by
bitmap_ops->create method, and we need to set the bitmap_ops
first. And changing the framwork will be much complex.

Thanks,
Kuai