overlay: allow overlaying on top of zfs #1432
Merged
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OpenZFS works fine as backing fs for overlayfs after the following commits:
openzfs/zfs@e015d6c
openzfs/zfs@86db35c
openzfs/zfs@dbf6108
Right now this only works with OpenZFS master, but it will find its way to 2.2 eventually, and right now testing it is entirely blocked by this check.