ZFS for FreeBSD

Eric Hodel | Mon, 28 Aug 2006 01:07:02 GMT

Hi.
I started porting the ZFS file system to the FreeBSD operating system.
There is a lot to do, but I’m making good progress, I think.
[...]
You can find all those on FreeBSD perforce server:
http://perforce.freebsd.org/depotTreeBrowser.cgi?FSPC=//depot/user/pjd/zfs&HIDEDEL=NO
Ok, so where am I?
I ported the userland bits (libzfs, zfs and zpool). I had ztest and libzpool compiling and working as well, but I left them behind for now to focus on kernel bits.
I’m building in all (except 2) files into zfs.ko (kernel module).
I created new VDEV – vdev_geom, which fits to FreeBSD’s GEOM infrastructure, so basically you can use any GEOM provider to build your ZFS pool. VDEV_GEOM is implemented as consumers-only GEOM class.
I reimplemented ZVOL to also export storage as GEOM provider. This time it is providers-only GEOM class.
This way one can create for example RAID-Z on top of GELI encrypted disks or encrypt ZFS volume. The order is free. Basically you can put UFS on ZFS volumes already and it behaves really stable even under heavy load.
Currently I’m working on file system bits (ZPL), which is the most hard part of the entire ZFS port, because it talks to one of the most complex part of the FreeBSD kernel – VFS.
I can already mount ZFS-created file systems (with ‘zfs create’ command), create files/directories, change permissions/owner/etc., list directories content, and perform few other minor operation.