Journaling means that there is a two phase commit to the metadata of the file system. This helps avoid file system corruption on unclean shutdown and speed up r

Journaling means that there is a two phase commit to the metadata of the file system. This helps avoid file system corruption on unclean shutdown and speed up recovery after an unclean shutdown. But it has nothing to do with data checksums. You can’t perform any scrub like behavior to validate your on, e.g., ext4 just because it has a journal.