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Date:   Thu, 31 Jan 2019 16:07:04 +0800
From:   Xiaoguang Wang <>
Subject: question about ext4 backup block group descriptors


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.

Xiaoguang Wang

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