15.02.2019 21:56, Remi Gauvin пишет: > On 2019-02-15 1:38 p.m., Chris Murphy wrote: >> >> Well I'd say maybe use -vvv and --no-data instead of -f and see what >> it's doing. It sounds like the former has no payload, just difference >> information, and the latter has a payload. I don't know why. >> >> > > > Both have all the payload they need to re-create the subvolumes. The > first one correctly CoW's the file from subvolume a.. the second one > stuffs it in the output... Why is indeed the question. >
The last extent is incomplete which causes btrfs to not attempt cloning.
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