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