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Date:   Fri, 1 Feb 2019 11:08:52 +0800
From:   Xiaoguang Wang <>
To:     Andreas Dilger <>
Subject: Re: question about ext4 backup block group descriptors


> On Jan 31, 2019, at 1:07 AM, Xiaoguang Wang <> wrote:
>> Anyone can help answer when ext4's backup block group descriptors are updated?
>> I had used blktrace to track the corresponding backup block group descriptor
>> block, but didn't find that any backup blocks were written.
>> Thanks in advance.
> The ext4 kernel code never updates the backup block group descriptors.  That is only
> done by e2fsck.
I see, thanks very much.

Xiaoguang Wang

> Cheers, Andreas

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