diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -205,6 +205,10 @@
 		res |= RBENEATH;
 	if ((fmode & O_EMPTY_PATH) != 0)
 		res |= EMPTYPATH;
+	if ((fmode & FREAD) != 0)
+		res |= OPENREAD;
+	if ((fmode & FWRITE) != 0)
+		res |= OPENWRITE;
 	if ((vn_open_flags & VN_OPEN_NOAUDIT) == 0)
 		res |= AUDITVNODE1;
 	if ((vn_open_flags & VN_OPEN_NOCAPCHECK) != 0)
diff --git a/sys/sys/namei.h b/sys/sys/namei.h
--- a/sys/sys/namei.h
+++ b/sys/sys/namei.h
@@ -183,8 +183,8 @@
 #define	AUDITVNODE1	0x00040000 /* audit the looked up vnode information */
 #define	AUDITVNODE2	0x00080000 /* audit the looked up vnode information */
 #define	NOCAPCHECK	0x00100000 /* do not perform capability checks */
-/* UNUSED		0x00200000 */
-/* UNUSED		0x00400000 */
+#define	OPENREAD	0x00200000 /* open for reading */
+#define	OPENWRITE	0x00400000 /* open for writing */
 /* UNUSED		0x00800000 */
 #define	HASBUF		0x01000000 /* has allocated pathname buffer */
 #define	NOEXECCHECK	0x02000000 /* do not perform exec check on dir */