I was just experimenting with snapshots on 4.9.0, and came across some
unexpected behavior.
The simple explanation is that if you snapshot a subvolume, any files in
the subvolume that have the NOCOW attribute will not have that attribute
in the snapshot. Some further testing indicates that this is the only
file attribute that isn't preserved (I checked all the chattr flags that
BTRFS supports).
I'm kind of curious whether:
1. This is actually documented somewhere, as it's somewhat unexpected
given that everything else is preserved when snapshotting.
2. This is intended behavior, or just happens to be a side effect of the
implementation.
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