linux-kernel - Re: [PATCH RFC md-6.14] md: reintroduce md-linear

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Message-ID: <64e02996-14b4-45ca-9288-4653561c51b1@gmail.com>
Date: Tue, 7 Jan 2025 15:32:26 -0500
From: RIc Wheeler <ricwheeler@...il.com>
To: Coly Li <colyli@...e.de>, Yu Kuai <yukuai1@...weicloud.com>
Cc: song@...nel.org, yukuai3@...wei.com, thetanix@...il.com,
 linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH RFC md-6.14] md: reintroduce md-linear


On 1/2/25 10:28 AM, Coly Li wrote:
>
>> 2025年1月2日 19:28，Yu Kuai <yukuai1@...weicloud.com> 写道：
>>
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> THe md-linear is removed by commit 849d18e27be9 ("md: Remove deprecated
>> CONFIG_MD_LINEAR") because it has been marked as deprecated for a long
>> time.
>>
>> However, md-linear is used widely for underlying disks with different size,
>> sadly we didn't know this until now, and it's true useful to create
>> partitions and assemble multiple raid and then append one to the other.
>>
>> People have to use dm-linear in this case now, however, they will prefer
>> to minimize the number of involved modules.
>>
>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> Acked-by: Coly Li <colyli@...nel.org>
>
> I am fully supportive to bring md-linear back. There are still many people/company/products using md-linear, just like the discussion in another thread.
>
> Thanks for doing this.
>
> Coly Li


Bringing it back is very welcome - we have many customers who use it as 
well.

Thanks!

Ric


>
>
>> ---
>> drivers/md/Kconfig             |  13 ++
>> drivers/md/Makefile            |   2 +
>> drivers/md/md-autodetect.c     |   8 +-
>> drivers/md/md-linear.c         | 354 +++++++++++++++++++++++++++++++++
>> drivers/md/md.c                |   2 +-
>> include/uapi/linux/raid/md_p.h |   2 +-
>> include/uapi/linux/raid/md_u.h |   2 +
>> 7 files changed, 379 insertions(+), 4 deletions(-)
>> create mode 100644 drivers/md/md-linear.c
>>
> [snipped]
>
>> 2.39.2
>>
>