20.02.2021 20:45, Alexander Wetzel пишет:

# time btrfs receive -v -f test2 .
receiving snapshot 2021-02-20-TEMP
uuid=120113e6-f83c-b240-ba27-259be4c92ea7, ctransid=206769
parent_uuid=d31d553f-0917-3c48-b65c-ec51fd0c6d89, parent_ctransid=195056

...

write var/lib/mysql/nextcloud/oc_activity.ibd - offset=737280 length=8192
ERROR: clone: did not find source subvol

Unforutnately btrfs receive does not print clone source UUID even with
"btrfs receive --dump". The best is to modify process_clone to print
full command including UUID which was not found.