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RE: kern/59452: Move NFS wcc data messages to debug or control them via sysctl.
The following reply was made to PR kern/59452; it has been noted by GNATS.
From: Marcin Gondek <drixter%e-utp.net@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>,
"kern-bug-people%netbsd.org@localhost" <kern-bug-people%netbsd.org@localhost>,
"gnats-admin%netbsd.org@localhost" <gnats-admin%netbsd.org@localhost>, "netbsd-bugs%netbsd.org@localhost"
<netbsd-bugs%netbsd.org@localhost>
Cc:
Subject: RE: kern/59452: Move NFS wcc data messages to debug or control them
via sysctl.
Date: Mon, 25 May 2026 21:27:53 +0000
Hi Christos
Should I use some specific mount option?
RC4+patch
NetBSD devil.e-utp.net 11.0_RC4 NetBSD 11.0_RC4 (DEVIL) #12: Mon May 25 20:=
18:27 CEST 2026 root%devil.e-utp.net@localhost:/usr/obj/sys/arch/amd64/compile/DEVIL=
amd64
[ 1523.851401] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccu=
rate wcc data (ctime) detected, disabling wcc (ctime 1779738980.705549207 1=
779738980.705549207, mtime 1779738980.705549207 1779738980.705549207)
diskstation6.e-utp.net:/volume1/Applications/NetBSD on /srv/NetBSD type nfs=
(fsid: 0xb09/0x70b, reads: sync 0 async 0, writes: sync 0 async 0, [nfs: a=
ddr=3D2001:67c:21ec:ffee:18f2:a77c:dc08:aef6, port=3D2049, addrlen=3D28, so=
type=3D1, proto=3D0, fhsize=3D0, flags=3D0x8a00<nfsv3,dumbtimr,resvport>, w=
size=3D32768, rsize=3D32768, readdirsize=3D4096, timeo=3D300, retrans=3D10,=
maxgrouplist=3D16, readahead=3D2, leaseterm=3D0, deadthresh=3D9])
# NetBSD /etc/fstab
diskstation6.e-utp.net:/volume1/Applications/NetBSD /srv/NetBSD =
nfs rw,auto,dumbtimer 0 0
--
Marcin Gondek / Drixter
http://fido.e-utp.net/
AS56662
-----Original Message-----
From: netbsd-bugs-owner%NetBSD.org@localhost <netbsd-bugs-owner%NetBSD.org@localhost> On Behalf=
Of Marcin Gondek via gnats
Sent: Monday, May 25, 2026 9:35 PM
To: kern-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs@netbsd.=
org; Marcin Gondek <drixter%e-utp.net@localhost>
Subject: RE: kern/59452: Move NFS wcc data messages to debug or control the=
m via sysctl.
The following reply was made to PR kern/59452; it has been noted by GNATS.
From: Marcin Gondek <drixter%e-utp.net@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>,
"kern-bug-people%netbsd.org@localhost" <kern-bug-people%netbsd.org@localhost>,
"gnats-admin%netbsd.org@localhost" <gnats-admin%netbsd.org@localhost>, "netbsd-bugs%netbsd.org@localhost=
"
<netbsd-bugs%netbsd.org@localhost>
Cc:=20
Subject: RE: kern/59452: Move NFS wcc data messages to debug or control the=
m via sysctl.
Date: Mon, 25 May 2026 19:31:35 +0000
Hi Christos,
=20
Patch is ok, just applied to 11.0RC4 sources, recompiled kernel and userl=
a=3D nd, reboot and observe.
Will let you know by EOW how this looks like, maybe there is chance to add=
=3D into 11.0
=20
Thanks,
=20
--
Marcin Gondek / Drixter
http://fido.e-utp.net/
AS56662
=20
-----Original Message-----
From: netbsd-bugs-owner%NetBSD.org@localhost <netbsd-bugs-owner%NetBSD.org@localhost> On Behal=
f=3D
Of Christos Zoulas via gnats
Sent: Monday, May 25, 2026 7:05 PM
To: kern-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs@netbsd=
.=3D org; Marcin Gondek <drixter%e-utp.net@localhost>
Subject: Re: kern/59452: Move NFS wcc data messages to debug or control th=
e=3D m via sysctl.
=20
The following reply was made to PR kern/59452; it has been noted by GNATS.
=20
From: Christos Zoulas <christos%zoulas.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost,
gnats-admin%netbsd.org@localhost,
netbsd-bugs%netbsd.org@localhost,
drixter%e-utp.net@localhost
Subject: Re: kern/59452: Move NFS wcc data messages to debug or control th=
e=3D m via sysctl.
Date: Mon, 25 May 2026 13:02:40 -0400
=20
--Apple-Mail=3D3D_0DA8FE95-C258-4AE8-9973-F2A6D11659AF
Content-Type: multipart/mixed;
boundary=3D3D"Apple-Mail=3D3D_AF8CA433-09A1-4A38-B6D8-CDC2E19FBABB"
=3D20
=3D20
--Apple-Mail=3D3D_AF8CA433-09A1-4A38-B6D8-CDC2E19FBABB
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=3D3Dus-ascii
=3D20
How about this diff?
=3D20
=3D20
--Apple-Mail=3D3D_AF8CA433-09A1-4A38-B6D8-CDC2E19FBABB
Content-Disposition: attachment;
filename=3D3Dnowccmsg.diff
Content-Type: application/octet-stream;
name=3D3Dnowccmsg.diff;
x-unix-mode=3D3D0664
Content-Transfer-Encoding: 7bit
=3D20
Index: sbin/mount_nfs/mount_nfs.8
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D
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 =3D3D 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
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D
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
=3D20
static const struct mntopt mopts[] =3D3D {
MOPT_STDOPTS,
@@ -130,6 +131,7 @@ static const struct mntopt mopts[] =3D3D {
{ "readahead", 0, ALTF_READAHEAD, 1 },
{ "deadthresh", 0, ALTF_DEADTHRESH, 1 },
{ "timeo", 0, ALTF_TIMEO, 1 },
+ { "wccmsg", 1, ALTF_NOWCCMSG, 1 },
MOPT_NULL,
=3D20
};
@@ -291,6 +293,8 @@ mount_nfs_parseargs(int argc, char *argv
nfsargsp->flags |=3D3D NFSMNT_INT;
if (altflags & ALTF_NOAC)
nfsargsp->flags |=3D3D NFSMNT_NOAC;
+ if (altflags & ALTF_NOWCCMSG)
+ nfsargsp->flags |=3D3D NFSMNT_NOWCCMSG;
if (altflags & (ALTF_NFSV3|ALTF_NQNFS)) {
if (force2)
conflicting();
Index: sys/nfs/nfs_clntsubs.c
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D
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
*/
=3D20
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 &=3D3D ~NFSMNT_WCCKLUDGE;
}
mutex_exit(&nmp->nm_lock);
Index: sys/nfs/nfsmount.h
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3=
D=3D3D=3D3D=3D3D
RCS file: /cvsroot/src/sys/nfs/nfsmount.h,v retrieving revision 1.54 di=
f=3D f -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 =
*=3D
/
=3D20
#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"
=3D20
/*
* NFS internal flags (nm_iflag) */
=3D20
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christos
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=20
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