"Journaling" is the process of recording every process that happens on the file system. In the event of a crash, the file system will not become corrupted, since any uncommitted changes not written to the journal can be rolled back.
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A journaling file system is a file system that keeps track of the changes in a journal before committing them to the main file system.If system crashes or power fails, such file systems replay the journal to bring file system to a consistent state.