'Does the ext3 file system have undo logging? If no, why not?
I learned from online articles that disk-based database systems have both undo and redo logging, because "steal, no-force" policy demands it. "Steal" policy means database system can write uncommitted data to disk, which needs undo logging to help rollback; "No-force" policy means database systems do not have to write in-memory data to disk because redo logging is able to help the recovery by replaying the redo log for a committed transaction.
Is ext3 journaling file system doing similar things for atomicity and durability? I learned from several online articles that ext3 file system only has redo logs. If it's true, then why ext3 does not have undo logs?
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