linux-kernel - [PATCH 2/4] nfs: add a tracepoint to nfs_inode_detach_delegation

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Message-Id: <20250603-nfs-tracepoints-v1-2-d2615f3bbe6c@kernel.org>
Date: Tue, 03 Jun 2025 07:42:24 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>
Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 2/4] nfs: add a tracepoint to
 nfs_inode_detach_delegation_locked

We have tracepoints for setting a delegation and reclaiming them. Add a
tracepoint for when the delegation is being detached from the inode.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfs/delegation.c | 2 ++
 fs/nfs/nfs4trace.h  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 10ef46e29b2544920c026f023885301d5d8e22cd..78a97d340bbd98390ca8302176c17caf08dcab4a 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -355,6 +355,8 @@ nfs_detach_delegation_locked(struct nfs_inode *nfsi,
 		rcu_dereference_protected(nfsi->delegation,
 				lockdep_is_held(&clp->cl_lock));
 
+	trace_nfs4_detach_delegation(&nfsi->vfs_inode, delegation->type);
+
 	if (deleg_cur == NULL || delegation != deleg_cur)
 		return NULL;
 
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index deab4c0e21a0642ee97b0b81f8c55812f5028f7c..6e1c4590ef9bf60eac994e85be816e82f5e0c741 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -956,6 +956,7 @@ DECLARE_EVENT_CLASS(nfs4_set_delegation_event,
 			TP_ARGS(inode, fmode))
 DEFINE_NFS4_SET_DELEGATION_EVENT(nfs4_set_delegation);
 DEFINE_NFS4_SET_DELEGATION_EVENT(nfs4_reclaim_delegation);
+DEFINE_NFS4_SET_DELEGATION_EVENT(nfs4_detach_delegation);
 
 TRACE_EVENT(nfs4_delegreturn_exit,
 		TP_PROTO(

-- 
2.49.0