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([2600:4040:5f58:2500:48a3:a7cd:313e:1c7a]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-46b2e571dd0sm28345951cf.57.2025.01.07.12.32.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jan 2025 12:32:27 -0800 (PST) Message-ID: <64e02996-14b4-45ca-9288-4653561c51b1@gmail.com> Date: Tue, 7 Jan 2025 15:32:26 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC md-6.14] md: reintroduce md-linear To: Coly Li , Yu Kuai Cc: song@kernel.org, yukuai3@huawei.com, thetanix@gmail.com, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, yi.zhang@huawei.com, yangerkun@huawei.com References: <20250102112841.1227111-1-yukuai1@huaweicloud.com> <58F4D954-1EC2-4E79-BE7C-3CB84F31CF49@suse.de> Content-Language: en-US From: RIc Wheeler In-Reply-To: <58F4D954-1EC2-4E79-BE7C-3CB84F31CF49@suse.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 1/2/25 10:28 AM, Coly Li wrote: > >> 2025年1月2日 19:28，Yu Kuai 写道： >> >> From: Yu Kuai >> >> 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 > Acked-by: Coly Li > > 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 >> >