From:   trondmy@kernel.org
To:     Chuck Lever <chuck.lever@oracle.com>,
        "J. Bruce Fields" <bfields@redhat.com>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH v2 09/10] nfsd: allow lockd to be forcibly disabled
Date:   Sat, 18 Dec 2021 20:38:02 -0500
Message-Id: <20211219013803.324724-10-trondmy@kernel.org>
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From: Jeff Layton <jeff.layton@primarydata.com>

In some cases, we may want to use a userland NLM server which will
require that we turn off lockd.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Lance Shelton <lance.shelton@hammerspace.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfsd/nfssvc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 80431921e5d7..6815c70b06af 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -340,8 +340,19 @@ static void nfsd_shutdown_generic(void)
 	nfsd_file_cache_shutdown();
 }
 
+/*
+ * Allow admin to disable lockd. This would typically be used to allow (e.g.)
+ * a userspace NLM server of some sort to be used.
+ */
+static bool nfsd_disable_lockd = false;
+module_param(nfsd_disable_lockd, bool, 0644);
+MODULE_PARM_DESC(nfsd_disable_lockd, "Allow lockd to be manually disabled.");
+
 static bool nfsd_needs_lockd(struct nfsd_net *nn)
 {
+	if (nfsd_disable_lockd)
+		return false;
+
 	return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
 }
 
-- 
2.33.1