diff --git a/sys/fs/fdescfs/fdesc.h b/sys/fs/fdescfs/fdesc.h
--- a/sys/fs/fdescfs/fdesc.h
+++ b/sys/fs/fdescfs/fdesc.h
@@ -42,6 +42,7 @@
 /* Private mount flags for fdescfs. */
 #define FMNT_UNMOUNTF	0x01
 #define FMNT_LINRDLNKF	0x02
+#define	FMNT_NODUP	0x04
 
 struct fdescmount {
 	struct vnode	*f_root;	/* Root node */
diff --git a/sys/fs/fdescfs/fdesc_vfsops.c b/sys/fs/fdescfs/fdesc_vfsops.c
--- a/sys/fs/fdescfs/fdesc_vfsops.c
+++ b/sys/fs/fdescfs/fdesc_vfsops.c
@@ -101,6 +101,8 @@
 	fmp->flags = 0;
 	if (vfs_getopt(mp->mnt_optnew, "linrdlnk", NULL, NULL) == 0)
 		fmp->flags |= FMNT_LINRDLNKF;
+	if (vfs_getopt(mp->mnt_optnew, "nodup", NULL, NULL) == 0)
+		fmp->flags |= FMNT_NODUP;
 	error = fdesc_allocvp(Froot, -1, FD_ROOT, mp, &rvp);
 	if (error) {
 		free(fmp, M_FDESCMNT);
diff --git a/sys/fs/fdescfs/fdesc_vnops.c b/sys/fs/fdescfs/fdesc_vnops.c
--- a/sys/fs/fdescfs/fdesc_vnops.c
+++ b/sys/fs/fdescfs/fdesc_vnops.c
@@ -267,10 +267,20 @@
     struct vnode **rvp)
 {
 	struct fdesc_get_ino_args *a;
+	struct fdescmount *fdm;
+	struct vnode *vp;
 	int error;
 
 	a = arg;
-	error = fdesc_allocvp(a->ftype, a->fd_fd, a->ix, mp, rvp);
+	fdm = VFSTOFDESC(mp);
+	if ((fdm->flags & FMNT_NODUP) != 0 && a->fp->f_type == DTYPE_VNODE) {
+		vp = a->fp->f_vnode;
+		vget(vp, lkflags | LK_RETRY);
+		*rvp = vp;
+		error = 0;
+	} else {
+		error = fdesc_allocvp(a->ftype, a->fd_fd, a->ix, mp, rvp);
+	}
 	fdrop(a->fp, a->td);
 	return (error);
 }