tmpfs_alloc_file
int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *,
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);