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Date:   Thu, 31 Jan 2019 18:45:29 -0700
From:   Andreas Dilger <>
To:     Xiaoguang Wang <>
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.

Cheers, Andreas

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