HAMMER is progressing well.  The filesystem basically works, but there

    are some major pieces missing such as, oh, the recovery code, and I

    still have a ton of issues to work through... the poor fs blows up

    when it runs out of space, for example, due to the horrible spike

    implementation I have right now.
    It isn't stable yet but some major milestones have been achieved.  I am

    able to cpdup, rm -rf, and perform historical queries on deleted data.
    Here is a quick example:
# newfs_hammer -L TEST -S /var/vkernel/hammerimg.01 /var/vkernel/hammerimg.02

... start up vkernel ...

# mount_hammer /dev/vkd2 /dev/vkd3 /mnt

# cpdup / /mnt/copy

# sync

# hammer now

0x47799042

# rm -rf /mnt/copy

...

# cd /mnt/copy@@0x47799042

[access originally cpdup'd data, even though you deleted it all]
    Please note that HAMMER is *NOT* yet ready for wider testing.  Please

    don't start reporting bugs yet, because there are still tons of things

    for me to work through.
						-Matt

Probably it's still too early to report bugs, but...
Index: hammer_subs.c

===================================================================

RCS file: /home/source/dragonfly/cvs/src/sys/vfs/hammer/hammer_subs.c,v

retrieving revision 1.10

diff -u -r1.10 hammer_subs.c

--- hammer_subs.c	1 Jan 2008 01:00:03 -0000	1.10

+++ hammer_subs.c	6 Jan 2008 10:10:26 -0000

@@ -72,8 +72,10 @@

 	KKASSERT(lock->refs > 0);

 	crit_enter();

 	if (lock->locktd != td) {

-		if (lock->locktd != NULL || lock->lockcount)

+		if (lock->locktd != NULL || lock->lockcount) {

+			crit_exit();

 			return(EAGAIN);

+		}

 		lock->locktd = td;

 	}

 	KKASSERT(lock->lockcount >= 0);
Cheers,

YONETANI Tomokazu