On Tue, Jul 03, 2007 at 05:32:00PM -0600, Andreas Dilger wrote: > On Jul 03, 2007 18:15 -0400, J. Bruce Fields wrote: > > How will nfsd tell whether it can really on a given filesystem's > > i_version, or whether it should fall back on ctime? > > Good question. Well, we don't need anything particularly complicated--just a one-bit flag on the superblock would be enough. > > So what's the motivation for the "noversion" mount option? > > Lustre needs to be able to control the version number directly (version > number needs to be ordered between all inodes, is set by Lustre to be a > transaction number). Instead of trying to incorporate this unused code > into ext4 we just turn off the ext4 version code and let Lustre control > this directly. It may even be that NFSv4 will need to control the version > numbers itself... I can't think of any reason we would need to in the near future, but maybe I'm insufficiently creative. The use of a mount option means the change attribute could be inconsistent across mounts. If we really need this, wouldn't it make more sense for it to be a persistent feature of the filesystem, set at mkfs time? --b. - 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
