linux-ext4 - Re: question about ext4 backup block group descriptors

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Message-Id: <B510E1BD-618E-4E26-88B1-8D70F78C9EEF@dilger.ca>
Date:   Thu, 31 Jan 2019 18:45:29 -0700
From:   Andreas Dilger <adilger@...ger.ca>
To:     Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: question about ext4 backup block group descriptors

On Jan 31, 2019, at 1:07 AM, Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com> 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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