Hey Hugo.


Thanks for your explanation.
I assume such a swapped send/receive would fail at least gracefully?


On Fri, 2021-01-29 at 19:20 +0000, Hugo Mills wrote:

   In your scenario with MASTER and COPY-1 swapped, you'd have to
match the received_uuid from the sending side (on old COPY-1) to the
actual UUID on old MASTER. The code doesn't do this, so you'd have to
patch send/receive to do this.

Well from the mailing list thread you've referenced it seems that the
whole thing is rather quite non-trivial... so I guess it's nothing for
someone who has basically no insight into btrfs code ^^


It's a pity though, that this doesn't work. Especially the use case of
sending back (backup)snapshots would seem pretty useful.

Given that this thread is nearly 6 years, I'd guess the whole idea has
been abandoned upstream?!


Cheers,
Chris.