K 10
svn:author
V 8
rmacklem
K 8
svn:date
V 27
2010-08-28T21:41:18.535850Z
K 7
svn:log
V 480
The timer routine in the experimental NFS server did not acquire
the correct mutex when checking nfsv4root_lock. Although this
could be fixed by adding mutex lock/unlock calls, zack.kirsch at
isilon.com suggested a better fix that uses a non-blocking
acquisition of a reference count on nfsv4root_lock. This fix
allows the weird NFSLOCKSTATE(); NFSUNLOCKSTATE(); synchronization
to be deleted. This patch applies this fix.

Tested by:	zack.kirsch at isilon.com
MFC after:	2 weeks

END