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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.
Files in this directory contain configuration for systemd-tmpfiles, a program to create, delete, and clean up volatile and temporary files and directories. See man:tmpfiles.d(5) for explanation of the configuration file format, and man:systemd-tmpfiles(8) for a description of when and how this configuration is applied. Use 'systemd-analyze cat-config tmpfiles.d' to display the effective config.