Index: sbin/mount_nfs/mount_nfs.8
===================================================================
RCS file: /cvsroot/src/sbin/mount_nfs/mount_nfs.8,v
retrieving revision 1.52
diff -u -p -u -r1.52 mount_nfs.8
--- sbin/mount_nfs/mount_nfs.8	14 Mar 2021 02:56:51 -0000	1.52
+++ sbin/mount_nfs/mount_nfs.8	25 May 2026 17:01:58 -0000
@@ -29,7 +29,7 @@
 .\"
 .\"	@(#)mount_nfs.8	8.3 (Berkeley) 3/29/95
 .\"
-.Dd January 24, 2021
+.Dd May 25, 2026
 .Dt MOUNT_NFS 8
 .Os
 .Sh NAME
@@ -234,6 +234,8 @@ Same as
 .It Cm wsize Ns = Ns Aq Ar writesize
 Same as
 .Fl w Ar writesize .
+.It Cm nowccmsg
+Disable WCC (Write Cache Consistency) warning messages.
 .El
 .It Fl P
 Use a reserved socket port number.
Index: sbin/mount_nfs/mount_nfs.c
===================================================================
RCS file: /cvsroot/src/sbin/mount_nfs/mount_nfs.c,v
retrieving revision 1.76
diff -u -p -u -r1.76 mount_nfs.c
--- sbin/mount_nfs/mount_nfs.c	3 Jan 2025 00:49:24 -0000	1.76
+++ sbin/mount_nfs/mount_nfs.c	25 May 2026 17:01:58 -0000
@@ -101,6 +101,7 @@ __RCSID("$NetBSD: mount_nfs.c,v 1.76 202
 #define ALTF_TIMEO	0x00400000
 #define ALTF_RETRANS	0x00800000
 #define ALTF_UDP	0x01000000
+#define ALTF_NOWCCMSG	0x02000000
 
 static const struct mntopt mopts[] = {
 	MOPT_STDOPTS,
@@ -130,6 +131,7 @@ static const struct mntopt mopts[] = {
 	{ "readahead", 0, ALTF_READAHEAD, 1 },
 	{ "deadthresh", 0, ALTF_DEADTHRESH, 1 },
 	{ "timeo", 0, ALTF_TIMEO, 1 },
+	{ "wccmsg", 1, ALTF_NOWCCMSG, 1 },
 	MOPT_NULL,
 
 };
@@ -291,6 +293,8 @@ mount_nfs_parseargs(int argc, char *argv
 				nfsargsp->flags |= NFSMNT_INT;
 			if (altflags & ALTF_NOAC)
 				nfsargsp->flags |= NFSMNT_NOAC;
+			if (altflags & ALTF_NOWCCMSG)
+				nfsargsp->flags |= NFSMNT_NOWCCMSG;
 			if (altflags & (ALTF_NFSV3|ALTF_NQNFS)) {
 				if (force2)
 					conflicting();
Index: sys/nfs/nfs_clntsubs.c
===================================================================
RCS file: /cvsroot/src/sys/nfs/nfs_clntsubs.c,v
retrieving revision 1.7
diff -u -p -u -r1.7 nfs_clntsubs.c
--- sys/nfs/nfs_clntsubs.c	21 Mar 2023 15:47:46 -0000	1.7
+++ sys/nfs/nfs_clntsubs.c	25 May 2026 17:01:58 -0000
@@ -423,7 +423,8 @@ nfs_check_wccdata(struct nfsnode *np, co
 			 */
 
 			mutex_enter(&nmp->nm_lock);
-			if (!NFS_WCCKLUDGE(nmp, now)) {
+			if (!NFS_WCCKLUDGE(nmp, now) &&
+			    !(nmp->nm_flag & NFSMNT_NOWCCMSG)) {
 				printf("%s: inaccurate wcc data (%s) detected,"
 				    " disabling wcc"
 				    " (ctime %u.%09u %u.%09u,"
@@ -447,8 +448,9 @@ nfs_check_wccdata(struct nfsnode *np, co
 		} else if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
 			mutex_enter(&nmp->nm_lock);
 			if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
-				printf("%s: re-enabling wcc\n",
-				    vp->v_mount->mnt_stat.f_mntfromname);
+				if (!(nmp->nm_flag & NFSMNT_NOWCCMSG))
+					printf("%s: re-enabling wcc\n",
+					    vp->v_mount->mnt_stat.f_mntfromname);
 				nmp->nm_iflag &= ~NFSMNT_WCCKLUDGE;
 			}
 			mutex_exit(&nmp->nm_lock);
Index: sys/nfs/nfsmount.h
===================================================================
RCS file: /cvsroot/src/sys/nfs/nfsmount.h,v
retrieving revision 1.54
diff -u -p -u -r1.54 nfsmount.h
--- sys/nfs/nfsmount.h	7 Dec 2024 02:05:55 -0000	1.54
+++ sys/nfs/nfsmount.h	25 May 2026 17:01:58 -0000
@@ -92,13 +92,15 @@ struct nfs_args {
 #define	NFSMNT_READDIRSIZE	0x00020000  /* Set readdir size */
 #define NFSMNT_XLATECOOKIE	0x00040000  /* 32<->64 dir cookie xlation */
 #define	NFSMNT_NOAC		0x00080000  /* Turn off attribute cache */
+#define	NFSMNT_NOWCCMSG		0x00100000  /* Turn off attribute wcc messages */
 
 #define NFSMNT_BITS	"\177\20" \
     "b\00soft\0b\01wsize\0b\02rsize\0b\03timeo\0" \
     "b\04retrans\0b\05maxgrps\0b\06intr\0b\07noconn\0" \
     "b\10nqnfs\0b\11nfsv3\0b\12kerb\0b\13dumbtimr\0" \
     "b\14leaseterm\0b\15readahead\0b\16deadthresh\0b\17resvport\0" \
-    "b\20rdirplus\0b\21readdirsize\0b\22xlatecookie\0b\23noac\0"
+    "b\20rdirplus\0b\21readdirsize\0b\22xlatecookie\0b\23noac\0" \
+    "b\24nowccmsg\0"
 
 /*
  * NFS internal flags (nm_iflag) */