Filesystems Reiser4 Fast, transactional, interesting Attributes as files Multi-stream files Extensive plugin architecture Some problems with kernel integration Sent back for big fixes Will eventually go in FUSE - filesystems in user space Write your filesystems in Python! Current locking, resource issues resolved Could be merged soon v9fs - the plan9 filesystem Flexible protocol for user-space filesystems [Eric Van Hensbergen, 4:30 Friday, Room B]