SDEV_VLINK
if (flags & SDEV_VLINK) {
type = SDEV_VLINK;
} else if (type & SDEV_VLINK) {
devvt_create_snode(sdvp, DEVVT_ACTIVE_NAME, cred, SDEV_VLINK);
devvt_create_snode(sdvp, DEVVT_CONSUSER_NAME, cred, SDEV_VLINK);
devzvol_create_link, SDEV_VLINK);