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This setting allows services to run in an ephemeral copy of the root directory or root image. To make sure the ephemeral copies are always cleaned up, we add a tmpfiles snippet to unconditionally clean up /var/lib/systemd/ephemeral. To prevent in use ephemeral copies from being cleaned up by tmpfiles, we use the newly added COPY_LOCK_BSD and BTRFS_SNAPSHOT_LOCK_BSD flags to take a BSD lock on the ephemeral copies which instruct tmpfiles to not touch those ephemeral copies as long as the BSD lock is held.