On 2017年11月24日 16:20, Lakshmipathi.G wrote:
> Okay thanks for the details on btrfs-image. I was about to try with
> previous version of
> btrfs-image.

No, it's not about btrfs-image itself, the flag is introduced long long
long way ago.

It's about kernel change which doesn't allow image with such flag to be
mounted AFAIK.

Thanks,
Qu

> 
> I'll use v4.14 (https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.tar.xz)
> and check
> again.
> 
> ----
> Cheers,
> Lakshmipathi.G
> http://www.giis.co.in http://www.webminal.org
> 
> 
> On Fri, Nov 24, 2017 at 1:36 PM, Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
>>
>>
>> On 2017年11月24日 15:47, Lakshmipathi.G wrote:
>>> Hi Qu,
>>>
>>> I'm using btrfs-progs devel branch. mount command is failing with misc/021.
>>> When I tried to manually mount it. dmesg shows  "unrecognized super
>>> flag: 17179869184"
>>> and interestingly "df -h" shows 16E as available!
>>
>> That flag is meta dump flag, any image recovered from btrfs-image should
>> have that flag.
>>
>> 16E may also related to that, but not a big problem as btrfs-image
>> result should only be used by developers, and all its data is wiped out.
>> (Maybe one day we will not allow RW mount for such image)
>>
>>
>> The problem happens when you try to mount the image, there may be some
>> new commits doing more restrict check for rw mount in devel branch.
>>
>> Would you please try v4.14 kernel?
>>
>> Thanks,
>> Qu
>>
>>>
>>> https://asciinema.org/a/4JGYg7YGQz1PHtdBRJ6AVw0fh
>>>
>>> Let me check further.
>>> ----
>>> Cheers,
>>> Lakshmipathi.G
>>> http://www.giis.co.in http://www.webminal.org
>>>
>>>
>>> On Fri, Nov 24, 2017 at 9:55 AM, Lakshmipathi.G
>>> <lakshmipathi.g@gmail.com> wrote:
>>>> Hi Qu,
>>>>
>>>> I'm using the same instance. Let me check again with and without the
>>>> commits list on Nov-23
>>>> (https://github.com/kdave/btrfs-devel/commits/misc-next) and get back
>>>> with results.
>>>>
>>>> ----
>>>> Cheers,
>>>> Lakshmipathi.G
>>>> http://www.giis.co.in http://www.webminal.org
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>>
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