diff --git a/libc/kernel/uapi/linux/nfs4.h b/libc/kernel/uapi/linux/nfs4.h
index bc3e002..9d614ce 100644
--- a/libc/kernel/uapi/linux/nfs4.h
+++ b/libc/kernel/uapi/linux/nfs4.h
@@ -124,8 +124,10 @@
 #define EXCHGID4_FLAG_MASK_PNFS 0x00070000
 #define EXCHGID4_FLAG_UPD_CONFIRMED_REC_A 0x40000000
 #define EXCHGID4_FLAG_CONFIRMED_R 0x80000000
+#define EXCHGID4_FLAG_SUPP_FENCE_OPS 0x00000004
 #define EXCHGID4_FLAG_MASK_A 0x40070103
 #define EXCHGID4_FLAG_MASK_R 0x80070103
+#define EXCHGID4_2_FLAG_MASK_R 0x80070107
 #define SEQ4_STATUS_CB_PATH_DOWN 0x00000001
 #define SEQ4_STATUS_CB_GSS_CONTEXTS_EXPIRING 0x00000002
 #define SEQ4_STATUS_CB_GSS_CONTEXTS_EXPIRED 0x00000004