diff --git a/uts/common/fs/vnode.c b/uts/common/fs/vnode.c
index 382369c7fc72..d67d1642868e 100644
--- a/uts/common/fs/vnode.c
+++ b/uts/common/fs/vnode.c
@@ -21,6 +21,7 @@
 
 /*
  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  */
 
 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
@@ -2582,6 +2583,15 @@ vnevent_mountedover(vnode_t *vp, caller_context_t *ct)
 	(void) VOP_VNEVENT(vp, VE_MOUNTEDOVER, NULL, NULL, ct);
 }
 
+void
+vnevent_truncate(vnode_t *vp, caller_context_t *ct)
+{
+	if (vp == NULL || vp->v_femhead == NULL) {
+		return;
+	}
+	(void) VOP_VNEVENT(vp, VE_TRUNCATE, NULL, NULL, ct);
+}
+
 /*
  * Vnode accessors.
  */
diff --git a/uts/common/fs/zfs/zfs_vnops.c b/uts/common/fs/zfs/zfs_vnops.c
index 6fa1d837008b..78e2a8cce5a6 100644
--- a/uts/common/fs/zfs/zfs_vnops.c
+++ b/uts/common/fs/zfs/zfs_vnops.c
@@ -2756,6 +2756,9 @@ zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
 			ZFS_EXIT(zfsvfs);
 			return (err);
 		}
+
+		if (vap->va_size == 0)
+			vnevent_truncate(ZTOV(zp), ct);
 	}
 
 	if (mask & (AT_ATIME|AT_MTIME) ||
@@ -4770,6 +4773,9 @@ zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag,
 
 	error = zfs_freesp(zp, off, len, flag, TRUE);
 
+	if (error == 0 && off == 0 && len == 0)
+		vnevent_truncate(ZTOV(zp), ct);
+
 	ZFS_EXIT(zfsvfs);
 	return (error);
 }
diff --git a/uts/common/sys/vnode.h b/uts/common/sys/vnode.h
index d29152346e2c..af9516fe52fb 100644
--- a/uts/common/sys/vnode.h
+++ b/uts/common/sys/vnode.h
@@ -21,6 +21,7 @@
 
 /*
  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  */
 
 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
@@ -733,7 +734,8 @@ typedef enum vnevent	{
 	VE_CREATE	= 5,	/* Create with vnode's name which exists */
 	VE_LINK		= 6, 	/* Link with vnode's name as source */
 	VE_RENAME_DEST_DIR	= 7, 	/* Rename with vnode as target dir */
-	VE_MOUNTEDOVER	= 8 	/* File or Filesystem got mounted over vnode */
+	VE_MOUNTEDOVER	= 8, 	/* File or Filesystem got mounted over vnode */
+	VE_TRUNCATE = 9		/* Truncate */
 } vnevent_t;
 
 /*
@@ -1290,6 +1292,7 @@ void	vnevent_create(vnode_t *, caller_context_t *);
 void	vnevent_link(vnode_t *, caller_context_t *);
 void	vnevent_rename_dest_dir(vnode_t *, caller_context_t *ct);
 void	vnevent_mountedover(vnode_t *, caller_context_t *);
+void	vnevent_truncate(vnode_t *, caller_context_t *);
 int	vnevent_support(vnode_t *, caller_context_t *);
 
 /* Vnode specific data */