Index: head/sys/compat/linuxkpi/common/src/linux_compat.c
===================================================================
--- head/sys/compat/linuxkpi/common/src/linux_compat.c
+++ head/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -1526,7 +1526,9 @@
 	struct linux_file *filp;
 	const struct file_operations *fop;
 	struct linux_cdev *ldev;
-	int error;
+	struct fiodgname_arg *fgn;
+	const char *p;
+	int error, i;
 
 	error = 0;
 	filp = (struct linux_file *)fp->f_data;
@@ -1553,6 +1555,23 @@
 		break;
 	case FIOGETOWN:
 		*(int *)data = fgetown(&filp->f_sigio);
+		break;
+	case FIODGNAME:
+#ifdef	COMPAT_FREEBSD32
+	case FIODGNAME_32:
+#endif
+		if (filp->f_cdev == NULL || filp->f_cdev->cdev == NULL) {
+			error = ENXIO;
+			break;
+		}
+		fgn = data;
+		p = devtoname(filp->f_cdev->cdev);
+		i = strlen(p) + 1;
+		if (i > fgn->len) {
+			error = EINVAL;
+			break;
+		}
+		error = copyout(p, fiodgname_buf_get_ptr(fgn, cmd), i);
 		break;
 	default:
 		error = linux_file_ioctl_sub(fp, filp, fop, cmd, data, td);