Hello Ted, > Yes, it does, sb_issue_discard(). So if you wanted to hook into this > routine with a function which issued calls to zero out blocks, it > would be easy to create a private patch. that sounds good because it wouldn't only target the most used filesystem but every other filesystem that uses the interface as well. Do you think that a tunable or configurable patch has a chance to hit upstream as well? Thomas -- 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