diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
index 6a4a7d81120252f7aefbc883b077bfc6a1a79062..89956898d0c780743fbb632e4c15e5cd6811c964 100644
--- a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
+++ b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
@@ -1189,6 +1189,7 @@ void lustre_swab_ptlrpc_body(struct ptlrpc_body *pb);
 						       *  RPCs in parallel
 						       */
 #define OBD_CONNECT_DIR_STRIPE	 0x400000000000000ULL/* striped DNE dir */
+#define OBD_CONNECT_SUBTREE	 0x800000000000000ULL /* fileset mount */
 /** bulk matchbits is sent within ptlrpc_body */
 #define OBD_CONNECT_BULK_MBITS	 0x2000000000000000ULL
 
diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
index db4999246feaf3d7d33fb7ec461bf651bb6b5ab1..f78928f3a51f554c63b0d3d8e2348007b5972933 100644
--- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
+++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
@@ -102,6 +102,7 @@ static const char * const obd_connect_names[] = {
 	"unlink_close",
 	"multi_mod_rpcs",
 	"dir_stripe",
+	"subtree",
 	"bulk_mbits",
 	"unknown",
 	NULL
diff --git a/drivers/staging/lustre/lustre/ptlrpc/wiretest.c b/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
index b2395638cccbb28f31b5f4d956ff9ca243adbca3..5619f11570b7faf16f36bc30424d1288b0aad1c3 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
@@ -1105,6 +1105,8 @@ void lustre_assert_wire_constants(void)
 		 OBD_CONNECT_MULTIMODRPCS);
 	LASSERTF(OBD_CONNECT_DIR_STRIPE == 0x400000000000000ULL, "found 0x%.16llxULL\n",
 		 OBD_CONNECT_DIR_STRIPE);
+	LASSERTF(OBD_CONNECT_SUBTREE == 0x800000000000000ULL, "found 0x%.16llxULL\n",
+		 OBD_CONNECT_SUBTREE);
 	LASSERTF(OBD_CKSUM_CRC32 == 0x00000001UL, "found 0x%.8xUL\n",
 		 (unsigned)OBD_CKSUM_CRC32);
 	LASSERTF(OBD_CKSUM_ADLER == 0x00000002UL, "found 0x%.8xUL\n",