* question about ext4 backup block group descriptors
@ 2019-01-31 8:07 Xiaoguang Wang
2019-02-01 1:45 ` Andreas Dilger
0 siblings, 1 reply; 3+ messages in thread
From: Xiaoguang Wang @ 2019-01-31 8:07 UTC (permalink / raw)
To: linux-ext4
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: question about ext4 backup block group descriptors
2019-01-31 8:07 question about ext4 backup block group descriptors Xiaoguang Wang
@ 2019-02-01 1:45 ` Andreas Dilger
2019-02-01 3:08 ` Xiaoguang Wang
0 siblings, 1 reply; 3+ messages in thread
From: Andreas Dilger @ 2019-02-01 1:45 UTC (permalink / raw)
To: Xiaoguang Wang; +Cc: linux-ext4
[-- Attachment #1: Type: text/plain, Size: 472 bytes --]
On Jan 31, 2019, at 1:07 AM, Xiaoguang Wang <xiaoguang.wang@linux.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
[-- Attachment #2: Message signed with OpenPGP --]
[-- Type: application/pgp-signature, Size: 873 bytes --]
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: question about ext4 backup block group descriptors
2019-02-01 1:45 ` Andreas Dilger
@ 2019-02-01 3:08 ` Xiaoguang Wang
0 siblings, 0 replies; 3+ messages in thread
From: Xiaoguang Wang @ 2019-02-01 3:08 UTC (permalink / raw)
To: Andreas Dilger; +Cc: linux-ext4
hi,
> On Jan 31, 2019, at 1:07 AM, Xiaoguang Wang <xiaoguang.wang@linux.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
>
>
>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-02-01 3:08 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-01-31 8:07 question about ext4 backup block group descriptors Xiaoguang Wang
2019-02-01 1:45 ` Andreas Dilger
2019-02-01 3:08 ` Xiaoguang Wang
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox