linux-ext4 - Re: LBS support for ext4

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Message-ID: <29ae1a6f-64da-4fdd-bd30-24c715f6faf0@pankajraghav.com>
Date: Thu, 9 Oct 2025 10:38:48 +0200
From: Pankaj Raghav <kernel@...kajraghav.com>
To: Zhang Yi <yi.zhang@...weicloud.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

On 10/9/25 10:07, Zhang Yi wrote:
> [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.
> 

Yes, we had similar issues with XFS where the test assumed the block size
can never be > PS. I fixed most of the issues in generic but I am not sure
about ext4 specific test cases.

>> 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!
> 

Perfect. Thanks a lot for the update and including the list in the conversation :)

--
Pankaj