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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <806e62a9-07a1-0a29-05a3-65257f98a741@linux.alibaba.com>
Date:   Fri, 1 Feb 2019 11:08:52 +0800
From:   Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: question about ext4 backup block group descriptors

hi,

> 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.
I see, thanks very much.

Regards,
Xiaoguang Wang

> 
> Cheers, Andreas
> 
> 
> 
> 
>