With this change, the logic to write the final tag, emit the final change notification and to offline the file moves from journal_file_close() to journald_file_close(). Since all this logic is only executed when the journal file is writable and all code that writes journal files already uses journald_file_close() instead of journal_file_close(), this change should not introduce any changes in behaviour. Moving the offline related logic to journald-file.c allows us to use code from src/shared in the offlining logic, more specifically, we can use the file copying logic from copy.h to fix BTRFS filesystem compression for journal files when archiving.
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