Currently it just restarts the call, without getting a new slot.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfsd/nfs4callback.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index d307ca1771bd1eca8f60b62a74170e71e5acf144..10067a34db3afff8d4e4383854ab9abd9767c2d6 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1394,6 +1394,14 @@ 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
+ * on the BC parameters. In this case, we want to mark the
+ * backchannel faulty and then try it again, 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
