NFSv4: Add tracepoints for debugging delegations

Set up tracepoints to track when delegations are set, reclaimed,
returned by the client, or recalled by the server.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4b3ba92b0e10..cbbaee27bf82 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4802,6 +4802,7 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
         if (!nfs4_sequence_done(task, &data->res.seq_res))
                 return;
 
+        trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
         switch (task->tk_status) {
         case -NFS4ERR_STALE_STATEID:
         case -NFS4ERR_EXPIRED:
@@ -4905,6 +4906,7 @@ int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4
         int err;
         do {
                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
+                trace_nfs4_delegreturn(inode, err);
                 switch (err) {
                         case -NFS4ERR_STALE_STATEID:
                         case -NFS4ERR_EXPIRED: