sysctl to make all nfs mounts use local file locking (patch enclosed)

[Ted Faber]

Hi.

I've recently upgraded my main work machine to -CURRENT in an
environment where much of the world is mounted via NFS.  The NFS locking
via rpc.lockd/rpc.statd doesn't seem to be too stable, and the -L
behavior described in mount_nfs(8) works much better for me.
Unfortunately, I can't seem to coax the automounter into providing those
kinds of mounts for me.

Since I only need the local locking behavior, I create a little sysctl
that adds the NFSMNT_NOLOCKD flag to any NFS mount.  I've made a patch
against -CURRENT for anyone who'd liek to add this functionality to
their kernel.

If a committer is {interested in,happy with} this patch, please feel free
to commit it.

And if I've missed a way to make the automounter do this, please wise me
up.

Thanks.

-- 
Ted Faber
http://www.isi.edu/~faber           PGP: http://www.isi.edu/~faber/pubkeys.asc
Unexpected attachment on this mail? See http://www.isi.edu/~faber/FAQ.html#SIG 
-------------- next part --------------
--- nfs_vfsops.c.orig	Tue Dec  7 06:26:39 2004
+++ nfs_vfsops.c	Tue Dec 14 12:39:22 2004
@@ -88,6 +88,9 @@
 static int nfs_ip_paranoia = 1;
 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
     &nfs_ip_paranoia, 0, "");
+static int nfs_force_local_locking = 0;
+SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_force_local_locking, CTLFLAG_RW,
+    &nfs_force_local_locking, 0, "");
 #ifdef NFS_DEBUG
 int nfs_debug;
 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
@@ -726,6 +729,10 @@
 	 */
 	if (nfs_ip_paranoia == 0)
 		args.flags |= NFSMNT_NOCONN;
+
+	if (nfs_force_local_locking) 
+		args.flags |= NFSMNT_NOLOCKD;
+
 	if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
 		return (EINVAL);
 	error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
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