NFSV4LOCK_LOCKWANTED
lp->nfslock_lock &= ~NFSV4LOCK_LOCKWANTED;
lp->nfslock_lock |= NFSV4LOCK_LOCKWANTED;
while (lp->nfslock_lock & (NFSV4LOCK_LOCK | NFSV4LOCK_LOCKWANTED)) {
lp->nfslock_lock &= ~NFSV4LOCK_LOCKWANTED;
lp->nfslock_lock &= ~NFSV4LOCK_LOCKWANTED;