On Wed, Dec 06, 2006 at 08:11:00PM +1100, David Chinner wrote: > They are defined but unused in 2.6.19, right? I can't see anywhere > in the 2.6.19 ext2/3/4/reiser trees that actually those flags, > including setting and retrieving them from disk. JFS i can see > sets, clears and retreives them, but not the fielsystems you > mention. Though I might just be blind..... ;) > > If all we need to add to XFS is support for those flags, then XFS > support would be trivial to add. > > Oh, damn. I take that back. We're almost out of flag space in the on > disk inode - these two flags would use the last 2 flag bits so this > may require an on disk inode format change in XFS. This will be > a little more complex than I first thought, but not impossible > as we already support two on-disk inode format versions. Hrm. I was toying around with the idea of using a flag to mark inodes as whiteouts (similar to what BSD does) for Unionfs. I remember that Jan Blunck tried similar thing in his implementation of VFS unionfs mounts. I am not entirely convinced that whiteout inode flag is the right way to do things, but I'm just raising this now as I wouldn't want to wait for new ondisk format for XFS to say that Unionfs supports XFS. (Assuming that it is the right approach.) ;-) Josef "Jeff" Sipek. -- I already backed up the box once, I can do it again! - 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
