linux-kernel - Re: [PATCH md-6.13] md: remove bitmap file support

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Message-ID: <ef4dcb9e-a2fa-d9dc-70c1-e58af6e71227@huaweicloud.com>
Date: Fri, 8 Nov 2024 09:03:25 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Song Liu <song@...nel.org>, Yu Kuai <yukuai1@...weicloud.com>
Cc: linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH md-6.13] md: remove bitmap file support

Hi,

在 2024/11/08 7:41, Song Liu 写道:
> On Thu, Nov 7, 2024 at 5:02 AM Yu Kuai <yukuai1@...weicloud.com> wrote:
>>
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> The bitmap file has been marked as deprecated for more than a year now,
>> let's remove it, and we don't need to care about this case in the new
>> bitmap.
>>
>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> 
> What happens when an old array with bitmap file boots into a kernel
> without bitmap file support?

If mdadm is used with bitmap file support, then kenel will just ignore
the bitmap, the same as none bitmap. Perhaps it's better to leave a
error message?

And if mdadm is updated, reassemble will fail.

Thanks,
Kuai

> 
> Thanks,
> Song
> .
>