[PATCH 1/3] NFSD: mark cl_cb_state as NFSD4_CB_DOWN if cl_cb_client is NULL

[Dai Ngo <dai.ngo@oracle.com>]

In nfsd4_run_cb_work if the rpc_clnt for the back channel is no longer
exists, the callback state in nfs4_client should be marked as NFSD4_CB_DOWN
so the server can notify the client to establish a new back channel
connection when it reconnects.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
---
 fs/nfsd/nfs4callback.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index cf87ace7a1b0..f8bb5ff2e9ac 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1491,9 +1491,14 @@ nfsd4_run_cb_work(struct work_struct *work)
 
 	clnt = clp->cl_cb_client;
 	if (!clnt) {
-		if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
+		if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
 			nfsd41_destroy_cb(cb);
-		else {
+			clear_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
+
+			/* let client knows BC is down when it reconnects */
+			clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
+			nfsd4_mark_cb_down(clp);
+		} else {
 			/*
 			 * XXX: Ideally, we could wait for the client to
 			 *	reconnect, but I haven't figured out how
-- 
2.39.3