OHSM team, I've been taking a look at the Ext4 list. You should read http://marc.info/?l=linux-ext4&m=122880166227883&w=2 I don't know your design well enough to know if those 3 ioctls will make sense for OHSM or not. Getting new userland / kernel ABI interfaces into the kernel can be very difficult, so if you don't think these will work for you I advise you reply to that message. It is only from last month, so the timing is very good. You may feel it is premature, but I really think you need to make your ideas known to Theodore Tso. FYI: Note the end of the msg discusses there being other users than just defrag. Obviously OHSM wants to be one of those other users. HTH Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ