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From:   Dave Wysochanski <dwysocha@redhat.com>
To:     Bruce Fields <bfields@fieldses.org>,
        Chuck Lever III <chuck.lever@oracle.com>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 1/1] nfsd4: Expose the callback address and state of each NFS4 client
Date:   Fri, 14 May 2021 09:30:41 -0400
Message-Id: <1620999041-9341-2-git-send-email-dwysocha@redhat.com>
In-Reply-To: <1620999041-9341-1-git-send-email-dwysocha@redhat.com>
References: <1620999041-9341-1-git-send-email-dwysocha@redhat.com>
Precedence: bulk

In addition to the client's address, display the callback channel
state and address in the 'info' file.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
---
 fs/nfsd/nfs4state.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 49c052243b5c..89a7cada334d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2357,6 +2357,21 @@ static void seq_quote_mem(struct seq_file *m, char *data, int len)
 	seq_printf(m, "\"");
 }
 
+static const char *cb_state_str(int state)
+{
+	switch (state) {
+		case NFSD4_CB_UP:
+			return "UP";
+		case NFSD4_CB_UNKNOWN:
+			return "UNKNOWN";
+		case NFSD4_CB_DOWN:
+			return "DOWN";
+		case NFSD4_CB_FAULT:
+			return "FAULT";
+	}
+	return "UNDEFINED";
+}
+
 static int client_info_show(struct seq_file *m, void *v)
 {
 	struct inode *inode = m->private;
@@ -2385,6 +2400,8 @@ static int client_info_show(struct seq_file *m, void *v)
 		seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
 			clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
 	}
+	seq_printf(m, "callback state: %s\n", cb_state_str(clp->cl_cb_state));
+	seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
 	drop_client(clp);
 
 	return 0;
-- 
1.8.3.1