diff --git a/sys/fs/puffs/puffs_msgif.h b/sys/fs/puffs/puffs_msgif.h
index e5da41778143..bf88bf5248ff 100644
--- a/sys/fs/puffs/puffs_msgif.h
+++ b/sys/fs/puffs/puffs_msgif.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: puffs_msgif.h,v 1.27 2007/04/16 13:03:26 pooka Exp $	*/
+/*	$NetBSD: puffs_msgif.h,v 1.28 2007/04/22 18:02:05 pooka Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006  Antti Kantee.  All Rights Reserved.
@@ -105,7 +105,8 @@ struct puffs_kargs {
 #define PUFFS_KFLAG_ALLOWCTL	0x01	/* ioctl/fcntl commands allowed */
 #define PUFFS_KFLAG_NOCACHE	0x02	/* flush page cache immediately	*/
 #define PUFFS_KFLAG_ALLOPS	0x04	/* ignore pa_vnopmask, send all */
-#define PUFFS_KFLAG_MASK	0x07
+#define PUFFS_KFLAG_WTCACHE	0x08	/* page cache is write-through  */
+#define PUFFS_KFLAG_MASK	0x0f
 
 #define PUFFS_FHFLAG_DYNAMIC	0x01
 #define PUFFS_FHFLAG_NFSV2	0x02
diff --git a/sys/fs/puffs/puffs_vnops.c b/sys/fs/puffs/puffs_vnops.c
index 58c86a41c4e8..8fd0d98a0c52 100644
--- a/sys/fs/puffs/puffs_vnops.c
+++ b/sys/fs/puffs/puffs_vnops.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: puffs_vnops.c,v 1.61 2007/04/20 11:56:35 pooka Exp $	*/
+/*	$NetBSD: puffs_vnops.c,v 1.62 2007/04/22 18:02:05 pooka Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006  Antti Kantee.  All Rights Reserved.
@@ -33,7 +33,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.61 2007/04/20 11:56:35 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.62 2007/04/22 18:02:05 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/fstrans.h>
@@ -1572,11 +1572,18 @@ puffs_write(void *v)
 			}
 		}
 
+		/* synchronous I/O? */
 		if (error == 0 && ap->a_ioflag & IO_SYNC) {
 			simple_lock(&vp->v_interlock);
 			error = VOP_PUTPAGES(vp, trunc_page(origoff),
 			    round_page(uio->uio_offset),
 			    PGO_CLEANIT | PGO_SYNCIO);
+
+		/* write though page cache? */
+		} else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) {
+			simple_lock(&vp->v_interlock);
+			error = VOP_PUTPAGES(vp, trunc_page(origoff),
+			    round_page(uio->uio_offset), PGO_CLEANIT);
 		}
 
 		puffs_updatenode(vp, uflags);