overlayfs: upperdir and workdir on same mount but different btrfs subvolume

[Michael GÃhler]

Hi,

think I found a small issue in overlayfs (kernel 4.0.0).

If I mount an overlay and specify two different subvolumes from the same 
btrfs
mount point, I don't get the expected:
overlayfs: workdir and upperdir must reside under the same mount

But any write operation on files from lowerdir fails with:
Invalid cross-device link

--
Michael GÃhler
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