linux-ext4 - Re: LBS support for ext4

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Message-ID: <69b42833-87ce-4a16-8f1b-7130fdfd23dc@huaweicloud.com>
Date: Thu, 9 Oct 2025 16:07:15 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Pankaj Raghav <me@...kajraghav.com>
Cc: Baokun Li <libaokun1@...wei.com>, Luis Chamberlain <mcgrof@...nel.org>,
 Swarna Prabhu <s.prabhu@...sung.com>,
 Ext4 Developers List <linux-ext4@...r.kernel.org>,
 Zhang Yi <yi.zhang@...wei.com>
Subject: Re: LBS support for ext4

[added ext4 list to CC]

Hi, Pankaj! Thank you for your letter.

On 10/7/2025 7:21 PM, Pankaj Raghav wrote:
> Hi Baokun and Zhang,
> 
>   I hope you both are doing well.
> 
> I was wondering recently about LBS support for ext4. You said you were working on them and have some
> local patches that enabled them [1]. Is there any update on that and when do you plan to post them
> on the mailing list? :)
> 

The current development work for ext4 LBS is essentially complete, and
testing is underway using various configurations of xfstests-bld.
However, since many test cases in the existing xfstests have
dependencies, such as rely on a 4KB block size image. So numerous cases
have failed. It is now necessary to analyze each failed case
individually and establish a new testing baseline.

> We are very interested in adding this support to ext4, so please let us know if you need some help
> with the review or testing.
> 

Baokun has been working on this, but the failure cases have not yet been
fully analyzed and he is currently on an urgent business trip. We can
send out an RFC series by mid to late this month after he returns.
Testing, analysis and review are welcome!

Best Regards,
Yi.