Index: fs/nfsserver/nfs_nfsdstate.c
===================================================================
--- fs/nfsserver/nfs_nfsdstate.c
+++ fs/nfsserver/nfs_nfsdstate.c
@@ -95,6 +95,7 @@
 static int nfsrv_returnoldstateid = 0, nfsrv_clients = 0;
 static int nfsrv_clienthighwater = NFSRV_CLIENTHIGHWATER;
 static int nfsrv_nogsscallback = 0;
+static volatile int nfsrv_writedelegcnt = 0;
 
 /* local functions */
 static void nfsrv_dumpaclient(struct nfsclient *clp,
@@ -1263,6 +1264,8 @@
 	LIST_REMOVE(stp, ls_hash);
 	LIST_REMOVE(stp, ls_list);
 	LIST_REMOVE(stp, ls_file);
+	if ((stp->ls_flags & NFSLCK_DELEGWRITE) != 0)
+		atomic_add_int(&nfsrv_writedelegcnt, -1);
 	lfp = stp->ls_lfp;
 	if (LIST_EMPTY(&lfp->lf_open) &&
 	    LIST_EMPTY(&lfp->lf_lock) && LIST_EMPTY(&lfp->lf_deleg) &&
@@ -2907,6 +2910,7 @@
 		    new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
 			NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
 		    *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
+		    atomic_add_int(&nfsrv_writedelegcnt, 1);
 		} else {
 		    new_deleg->ls_flags = (NFSLCK_DELEGREAD |
 			NFSLCK_READACCESS);
@@ -3037,6 +3041,7 @@
 			new_deleg->ls_clp = clp;
 			new_deleg->ls_filerev = filerev;
 			new_deleg->ls_compref = nd->nd_compref;
+			atomic_add_int(&nfsrv_writedelegcnt, 1);
 			LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
 			LIST_INSERT_HEAD(NFSSTATEHASH(clp,
 			    new_deleg->ls_stateid), new_deleg, ls_hash);
@@ -3094,6 +3099,7 @@
 			    new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
 				NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
 			    *rflagsp |= NFSV4OPEN_WRITEDELEGATE;
+			    atomic_add_int(&nfsrv_writedelegcnt, 1);
 			} else {
 			    new_deleg->ls_flags = (NFSLCK_DELEGREAD |
 				NFSLCK_READACCESS);
@@ -3170,6 +3176,7 @@
 					     NFSLCK_READACCESS |
 					     NFSLCK_WRITEACCESS);
 					*rflagsp |= NFSV4OPEN_WRITEDELEGATE;
+					atomic_add_int(&nfsrv_writedelegcnt, 1);
 				} else {
 					new_deleg->ls_flags =
 					    (NFSLCK_DELEGREAD |
@@ -5293,13 +5300,16 @@
 	struct nfsclient *clp;
 	struct nfsvattr nva;
 	fhandle_t nfh;
-	int error = 0;
+	int error = 0, wdelegcnt;
 	nfsattrbit_t cbbits;
 	u_quad_t delegfilerev;
 
 	NFSCBGETATTR_ATTRBIT(attrbitp, &cbbits);
 	if (!NFSNONZERO_ATTRBIT(&cbbits))
 		goto out;
+	wdelegcnt = atomic_load_acq_int(&nfsrv_writedelegcnt);
+	if (wdelegcnt == 0)
+		goto out;
 
 	/*
 	 * Get the lock file structure.