On Tue, Apr 26, 2011 at 05:23:21PM +0800, Ding Dinghua wrote: > I think it's not only a performance issue but more important, a > correctness issue. > Revoke table is used for preventing the wrong replay of journal which > cause data corruption: > If block A has been journalled its modification, committed to journal > and hasn't been checkpointed, > and in later transactions block A is freed and reused for data in > no-journalled-data mode, then If > we don't have revoke table which recording the releasing event, replay > of journal will overwrite the new data, > which causing data corruption. Yes, this is correct. It should be covered fairly well in Stephen Tweedie's, "Journaling the ext2fs file system" paper, which you can find at: https://ext4.wiki.kernel.org/index.php/Publications if you'd like more details. Hope this helps! - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
