On Sun, Aug 10, 2014 at 08:38:25AM +0000, Shuichi Ihara wrote: > > One of our (Li Xi and ourself) purpose of what we need project quota > support in ext4, is project quota support in the Lustre filesystem. OK, but for lustre, you completely bypass the VFS when you write the back end files. Yes? So if implement something which is XFS compatible vis-a-vis a directory tree quota, it doesn't matter if Lustre is creating many different files that belong to project id's. This being said, for this particular use case, I'm not entirely sure why you can't just create separate groups for each project, and then let group inheritance take care of things: mkdir top-level chgrp project1 top-level chmod g+s top-level Now all of the files created in top-level will be accounted in project1's quota. If the answer is that it's too easy to evade quota controls by using the "chgrp" command, note that if you are going to allow users to mv files around, they can easily evade the project quota anyway, by creating the file in top-level dirctory of project2, and then mv'ing it into the top-level directory of project1. Or are you really saying you really need to simultaneously track quota from a group perspective, and a project perspectively, at the same time? If so, why? Regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
