Re: Cryptographically verifying a btrfs subvolume

[Leonid Bloch <lbloch@janustech.com>]

On 4/8/19 4:10 PM, Johannes Thumshirn wrote:
> On Mon, Apr 08, 2019 at 11:27:51AM +0000, Leonid Bloch wrote:
>> Hi List,
>>
>> Can you suggest a way of cryptographically verifying the content of a
>> btrfs subvolume, besides the naïve approach, of running a cryptographic
>> hash function on the output of btrfs send?
>>
>> Back in 2014, an RFC patch was sent to allow using sha256 instead of
>> crc32c for checksumming.
>> (https://patchwork.kernel.org/patch/5363311)
>> It was not merged. Had it been merged, one could just check the return
>> value of btrfs scrub, instead of checksumming the whole btrfs send
>> output, correct?
> 
> Hi Leonid,
> 
> I'm working on this feature currently but unfortunately get distracted with
> other things all too often.
> 
> Thanks for your patience.
> 
> Byte,
> 	Johannes

Hi Johannes,

Thanks for letting know! Btrfs inspect-internal csum-dump indeed sounds 
awesome! Recursively, on a subvolume that would be perfect. Let me know 
if help is needed.

Thanks,
Leonid.
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