nfs4_safelock
if (!nfs4_safelock(vp, bfp, cr))
if (!nfs4_safelock(vp, bfp, cr)) {
if (!nfs4_safelock(vp, flk, cr)) {
static int nfs4_safelock(vnode_t *, const struct flock64 *, cred_t *);