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.
I'm doing my work in those directories:
contrib/opensolaris/ - userland files taken directly from
OpenSolaris (libzfs, zpool, zfs and others)
sys/contrib/opensolaris/ - kernel files taken directly from
OpenSolaris (zfs, taskq, callb and others)
compat/opensolaris/ - compatibility userland layer, so I can
reduce diffs against vendor files
sys/compat/opensolaris/ - compatibility kernel layer, so I can
reduce diffs against vendor files (kmem based on
malloc(9) and uma(9), mutexes based on our sx(9) locks,
condvars based on sx(9) locks and more)
cddl/ - FreeBSD specific makefiles for userland bits
sys/modules/zfs/ - FreeBSD specific makefile for the kernel
module
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.
Some "screenshots":
lcf:root:~# uname -a
FreeBSD lcf 7.0-CURRENT FreeBSD 7.0-CURRENT #74: Tue Aug 22 03:04:01
UTC 2006 [EMAIL PROTECTED]:/usr/obj/zoo/pjd/lcf/sys/LCF i386
lcf:root:~# zpool create tank raidz /dev/ad4a /dev/ad6a /dev/ad5a
lcf:root:~# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
tank 35,8G 11,7M 35,7G 0% ONLINE -
lcf:root:~# zpool status
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad4a ONLINE 0 0 0
ad6a ONLINE 0 0 0
ad5a ONLINE 0 0 0
errors: No known data errors
lcf:root:# zfs create -V 10g tank/vol
lcf:root:# newfs /dev/zvol/tank/vol
lcf:root:# mount /dev/zvol/tank/vol /mnt/test
lcf:root:# zfs create tank/fs
lcf:root:~# mount -t zfs,ufs
tank on /tank (zfs, local)
tank/fs on /tank/fs (zfs, local)
/dev/zvol/tank/vol on /mnt/test (ufs, local)
lcf:root:~# df -ht zfs,ufs
Filesystem Size Used Avail Capacity Mounted on
tank 13G 34K 13G 0% /tank
tank/fs 13G 33K 13G 0% /tank/fs
/dev/zvol/tank/vol 9.7G 4.0K 8.9G 0% /mnt/test
lcf:root:~# mkdir /tank/fs/foo
lcf:root:~# touch /tank/fs/foo/bar
lcf:root:~# chown root:operator /tank/fs/foo /tank/fs/foo/bar
lcf:root:~# chmod 500 /tank/fs/foo
lcf:root:~# ls -ld /tank/fs/foo /tank/fs/foo/bar
dr-x------ 2 root operator 3 22 sie 05:41 /tank/fs/foo
-rw-r--r-- 1 root operator 0 22 sie 05:42 /tank/fs/foo/bar
The most important missing pieces:
- Most of the ZPL layer.
- Autoconfiguration. I need implement vdev discovery based on GEOM's taste
mechanism.
- .zfs/ control directory (entirely commented out for now).
And many more, but hey, this is after 10 days of work.
PS. Please contact me privately if your company would like to donate to the
ZFS effort. Even without sponsorship the work will be finished, but
your contributions will allow me to spend more time working on ZFS.
--
Pawel Jakub Dawidek http://www.wheel.pl
[EMAIL PROTECTED] http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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