In a journaling file system, what is the difference between "metadata-only" journaling and "full data" journaling?

A Metadata-only journaling logs changes to file system structures (inodes, directories) for fast crash recovery, while full data journaling additionally logs file content changes, offering stronger consistency at the cost of more I/O overhead B Metadata-only journaling is used exclusively on solid-state drives, while full data journaling is used only on spinning disks C They are identical in behavior; the distinction is purely a marketing term used by different vendors D Full data journaling skips the journal entirely and writes directly to the final location