Index: vfs_aio.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/vfs_aio.c,v
retrieving revision 1.227
diff -u -r1.227 vfs_aio.c
--- vfs_aio.c	24 Sep 2006 04:47:47 -0000	1.227
+++ vfs_aio.c	6 Oct 2006 03:13:40 -0000
@@ -1331,6 +1331,7 @@
 	struct socket *so;
 	struct aiocblist *aiocbe, *cb;
 	struct kaioinfo *ki;
+	struct vnode *vp;
 	struct kevent kev;
 	struct sockbuf *sb;
 	int opcode;
@@ -1410,6 +1411,18 @@
 	default:
 		error = fget(td, fd, &fp);
 	}
+
+	if (error == 0) {
+		/* XXX Only block device and disk file is supported */
+		if (fp->f_type != DTYPE_VNODE)
+			error = ENOTSUP;
+		else {
+			vp = fp->f_vnode;
+			if (vp->v_type != VREG && !vn_isdisk(vp, &error))
+				error = ENOTSUP;
+		}
+	}
+
 	if (error) {
 		uma_zfree(aiocb_zone, aiocbe);
 		suword(&job->_aiocb_private.error, error);