Currently it just restarts the call, without getting a new slot.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfsd/nfs4callback.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 18803ebe2bddd433308cabd6f99b64ec887069a7..8ba1a2831e8601ac3af9c5f147d3dcddcc1bec77 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1389,6 +1389,13 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
rpc_delay(task, 2 * HZ);
return false;
case -NFS4ERR_BADSLOT:
+ /*
+ * BADSLOT means that the client and server are out of sync
+ * as to the backchannel parameters. Mark the backchannel faulty
+ * and restart the RPC, but leak the slot so no one uses it.
+ */
+ nfsd4_mark_cb_fault(cb->cb_clp);
+ cb->cb_held_slot = -1;
goto retry_nowait;
case -NFS4ERR_SEQ_MISORDERED:
if (session->se_cb_seq_nr[cb->cb_held_slot] != 1) {
--
2.48.1
