btrfs send - detect if complete

[Lubos Kolouch <kolcon@kolcon.net>]

Hello,

I am building a backup system, based on btrfs incremental send/receive.

I am a bit stuck on how to detect, if the transfer has been completed
(and not interrupted during transfer).

Host A :
du --max-depth=0 home_20160117
45787768  home_20160117

btrfs send home_20160117 | ssh dest_host "btrfs receive 
/mnt/destination/"

… transfer completes without any error

on dest_host:

du --max-depth=0 home_20160117
45763984  home_20160117

Ie. the size differs, perhaps due to different compression(?)

The volume seems OK, I can use it as a parent volume for further 
transfers etc.

The question is - is there a "btrfs native" way to tell, if the two
subvolumes are really identical (and the transfer was not interrupted 
etc.)?

Or do I have to resort to costly things like checksumming all files?

Thanks,

Lubos