diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 25278c8..f518209 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/buf.h>
 #include <sys/conf.h>
 #include <sys/event.h>
+#include <sys/filio.h>
 #include <sys/kernel.h>
 #include <sys/limits.h>
 #include <sys/lock.h>
@@ -75,6 +76,7 @@ static int	get_next_dirent(struct vnode *vp, struct dirent **dpp,
 				struct thread *td);
 static int	dirent_exists(struct vnode *vp, const char *dirname,
 			      struct thread *td);
+static vop_ioctl_t vop_stdioctl;
 
 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4)
 
@@ -107,7 +109,7 @@ struct vop_vector default_vnodeops = {
 	.vop_getpages =		vop_stdgetpages,
 	.vop_getwritemount = 	vop_stdgetwritemount,
 	.vop_inactive =		VOP_NULL,
-	.vop_ioctl =		VOP_ENOTTY,
+	.vop_ioctl =		vop_stdioctl,
 	.vop_kqfilter =		vop_stdkqfilter,
 	.vop_islocked =		vop_stdislocked,
 	.vop_lock1 =		vop_stdlock,
@@ -1064,6 +1066,74 @@ vop_stdunp_detach(struct vop_unp_detach_args *ap)
 	return (0);
 }
 
+static int
+vop_stdioctl(struct vop_ioctl_args *ap)
+{
+	struct vnode *vp;
+	struct vattr va;
+	daddr_t bn, bnp;
+	uint64_t bsize;
+	off_t off, noff;
+	int error;
+
+	vp = ap->a_vp;
+	error = ENOTTY;
+
+	switch (ap->a_command) {
+	case FIOSEEKDATA:
+	case FIOSEEKHOLE:
+		off = *(off_t *)ap->a_data;
+		if (vn_lock(vp, LK_SHARED) != 0) {
+			error = EBADF;
+			break;
+		}
+		if (vp->v_type != VREG) {
+			error = ENOTTY;
+			goto holeend;
+		}
+		error = VOP_GETATTR(vp, &va, ap->a_cred);
+		if (error != 0)
+			goto holeend;
+		if (off >= va.va_size) {
+			error = ENXIO;
+			goto holeend;
+		}
+		bsize = vp->v_mount->mnt_stat.f_iosize;
+		for (bn = off / bsize, noff = off; noff < va.va_size;
+		    bn++, noff += bsize) {
+			error = VOP_BMAP(vp, bn, NULL, &bnp, NULL, NULL);
+			if (error == EOPNOTSUPP) {
+				error = ENOTTY;
+				goto holeend;
+			}
+			if (bnp == -1 && ap->a_command == FIOSEEKHOLE) {
+				noff = bn * bsize;
+				if (noff < off)
+					noff = off;
+				goto holeend;
+			} else if (bnp != -1 && ap->a_command == FIOSEEKDATA) {
+				noff = bn * bsize;
+				if (noff < off)
+					noff = off;
+				goto holeend;
+			}
+		}
+		if (noff > va.va_size)
+			noff = va.va_size;
+		/* noff == va.va_size */
+		if (ap->a_command == FIOSEEKDATA)
+			error = ESRCH;
+holeend:
+		VOP_UNLOCK(vp, 0);
+		if (error == 0)
+			*(off_t *)ap->a_data = noff;
+		break;
+	}
+	return (error);
+}
+
+
+
 /*
  * vfs default ops
  * used to fill the vfs function table to get reasonable default return values.