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From:   "NeilBrown" <neilb@suse.de>
To:     Steve Dickson <steved@redhat.com>
Cc:     Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: [PATCH nfs-utils] Apply all sysctl settings when NFS-related modules
 are loaded.
Date:   Tue, 24 May 2022 12:01:34 +1000
Message-id: <165335769457.22265.5383162992195478413@noble.neil.brown.name>
Precedence: bulk


sysctl settings (e.g.  /etc/sysctl.conf and others) are normally loaded
once at boot.  If the module that implements some settings is no yet
loaded, those settings don't get applied.

Various NFS modules support various sysctl settings.  If they are loaded
after boot, they miss out.

So add commands to modprobe.d/50-nfs.conf to apply the relevant settings
when the module is loaded.

I have placed this in the "systemd" directory because it seemed the
least bad choice.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 systemd/50-nfs.conf | 16 ++++++++++++++++
 systemd/Makefile.am | 10 ++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 systemd/50-nfs.conf

diff --git a/systemd/50-nfs.conf b/systemd/50-nfs.conf
new file mode 100644
index 000000000000..b56b2d765969
--- /dev/null
+++ b/systemd/50-nfs.conf
@@ -0,0 +1,16 @@
+# Ensure all NFS systctl settings get applied when modules load
+
+# sunrpc module supports "sunrpc.*" sysctls
+install sunrpc /sbin/modprobe --ignore-install sunrpc $CMDLINE_OPTS && /sbin=
/sysctl -q --pattern sunrpc --system
+
+# rpcrdma module supports sunrpc.svc_rdma.*
+install rpcrdma /sbin/modprobe --ignore-install rpcrdma $CMDLINE_OPTS && /sb=
in/sysctl -q --pattern sunrpc.svc_rdma --system
+
+# lockd module supports "fs.nfs.nlm*" and "fs.nfs.nsm*" sysctls
+install lockd /sbin/modprobe --ignore-install lockd $CMDLINE_OPTS && /sbin/s=
ysctl -q --pattern fs.nfs.n[sl]m --system
+
+# nfsv4 module supports "fs.nfs.*" sysctls (nfs_callback_tcpport and idmap_c=
ache_timeout)
+install nfsv4 /sbin/modprobe --ignore-install nfsv4 $CMDLINE_OPTS && /sbin/s=
ysctl -q --pattern 'fs.nfs.(nfs_callback_tcpport|idmap_cache_timeout)' --syst=
em
+
+# nfs module supports "fs.nfs.*" sysctls
+install nfs /sbin/modprobe --ignore-install nfs $CMDLINE_OPTS && /sbin/sysct=
l -q --pattern fs.nfs --system
diff --git a/systemd/Makefile.am b/systemd/Makefile.am
index e7f5d818a913..63a50bf2c07e 100644
--- a/systemd/Makefile.am
+++ b/systemd/Makefile.am
@@ -2,6 +2,8 @@
=20
 MAINTAINERCLEANFILES =3D Makefile.in
=20
+modprobe_files =3D 50-nfs.conf
+
 unit_files =3D  \
     nfs-client.target \
     rpc_pipefs.target \
@@ -51,7 +53,7 @@ endif
=20
 man5_MANS	=3D nfs.conf.man
 man7_MANS	=3D nfs.systemd.man
-EXTRA_DIST =3D $(unit_files) $(man5_MANS) $(man7_MANS)
+EXTRA_DIST =3D $(unit_files) $(modprobe_files) $(man5_MANS) $(man7_MANS)
=20
 generator_dir =3D $(unitdir)/../system-generators
=20
@@ -73,8 +75,12 @@ rpc_pipefs_generator_LDADD =3D ../support/nfs/libnfs.la
=20
 if INSTALL_SYSTEMD
 genexec_PROGRAMS =3D nfs-server-generator rpc-pipefs-generator
-install-data-hook: $(unit_files)
+install-data-hook: $(unit_files) $(modprobe_files)
 	mkdir -p $(DESTDIR)/$(unitdir)
 	cp $(unit_files) $(DESTDIR)/$(unitdir)
 	cp $(rpc_pipefs_mount_file) $(DESTDIR)/$(unitdir)/$(rpc_pipefsmount)
+else
+install-data-hook: $(modprobe_files)
 endif
+	mkdir -p $(DESTDIR)/usr/lib/modprobe.d
+	cp $(modprobe_files) $(DESTDIR)/usr/lib/modprobe.d/
--=20
2.36.1