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From: Jeff Layton <jlayton@kernel.org>
Date: Fri, 15 Mar 2024 12:53:09 -0400
Subject: [PATCH RFC 18/24] nfs: add a tracepoint to
 nfs_inode_detach_delegation_locked
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To: Alexander Viro <viro@zeniv.linux.org.uk>, 
 Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>, 
 Chuck Lever <chuck.lever@oracle.com>, 
 Alexander Aring <alex.aring@gmail.com>, 
 Trond Myklebust <trond.myklebust@hammerspace.com>, 
 Anna Schumaker <anna@kernel.org>, Steve French <sfrench@samba.org>, 
 Paulo Alcantara <pc@manguebit.com>, 
 Ronnie Sahlberg <ronniesahlberg@gmail.com>, 
 Shyam Prasad N <sprasad@microsoft.com>, Tom Talpey <tom@talpey.com>, 
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@kernel.org>, 
 David Howells <dhowells@redhat.com>, Tyler Hicks <code@tyhicks.com>, 
 Neil Brown <neilb@suse.de>, Olga Kornievskaia <kolga@netapp.com>, 
 Dai Ngo <Dai.Ngo@oracle.com>, Miklos Szeredi <miklos@szeredi.hu>, 
 Amir Goldstein <amir73il@gmail.com>, Namjae Jeon <linkinjeon@kernel.org>, 
 Sergey Senozhatsky <senozhatsky@chromium.org>, 
 "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, 
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, 
 samba-technical@lists.samba.org, netfs@lists.linux.dev, 
 ecryptfs@vger.kernel.org, linux-unionfs@vger.kernel.org, 
 netdev@vger.kernel.org, Jeff Layton <jlayton@kernel.org>

We have a tracepoint 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@kernel.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 d4a42ce0c7e3..a331a2dbae12 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -342,6 +342,8 @@ 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 fd7cb15b08b2..b4ebac1961cc 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -926,6 +926,7 @@ 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(

-- 
2.44.0