diff --git a/sys/sys/mount.h b/sys/sys/mount.h
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -685,6 +685,8 @@
 #define	VFCF_SBDRY	0x01000000	/* Stop at Boundary: defer stop requests
 					   to kernel->user (AST) transition */
 #define	VFCF_FILEMOUNT	0x02000000	/* allow mounting files */
+#define	VFCF_FILEREVINC	0x04000000	/* va_filerev is incr. by one */
+#define	VFCF_FILEREVCT	0x08000000	/* va_filerev is set to ctime */
 
 typedef uint32_t fsctlop_t;
 
diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -117,7 +117,7 @@
 	.vfs_susp_clean =	process_deferred_inactive,
 };
 
-VFS_SET(ufs_vfsops, ufs, 0);
+VFS_SET(ufs_vfsops, ufs, VFCF_FILEREVINC);
 MODULE_VERSION(ufs, 1);
 
 static b_strategy_t ffs_geom_strategy;