question about ext4 backup block group descriptors

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To: linux-ext4@xxxxxxxxxxxxxxx
Subject: question about ext4 backup block group descriptors
From: Xiaoguang Wang <xiaoguang.wang@xxxxxxxxxxxxxxxxx>
Date: Thu, 31 Jan 2019 16:07:04 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

hi,

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.

Regards,
Xiaoguang Wang

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