--- a/usr/src/uts/common/fs/zfs/sys/zfs_vfsops.h	Tue Feb 26 07:21:54 2008 -0800
+++ b/usr/src/uts/common/fs/zfs/sys/zfs_vfsops.h	Tue Feb 26 11:31:49 2008 -0800
@@ -74,7 +74,8 @@
 	boolean_t	z_issnap;	/* true if this is a snapshot */
 	boolean_t	z_vscan;	/* virus scan on/off */
 	boolean_t	z_use_fuids;	/* version allows fuids */
-	uint64_t	z_version;
+	kmutex_t	z_online_recv_lock; /* recv in prog grabs as WRITER */
+	uint64_t	z_version;	/* ZPL version */
 #define	ZFS_OBJ_MTX_SZ	64
 	kmutex_t	z_hold_mtx[ZFS_OBJ_MTX_SZ];	/* znode hold locks */
 };