Received-SPF: pass (google.com: domain of linux-nfs+bounces-2497-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
From: Chen Hanxiao <chenhx.fnst@fujitsu.com>
To: Chuck Lever <chuck.lever@oracle.com>,
	Jeff Layton <jlayton@kernel.org>,
	Neil Brown <neilb@suse.de>,
	Olga Kornievskaia <kolga@netapp.com>,
	Dai Ngo <Dai.Ngo@oracle.com>,
	Tom Talpey <tom@talpey.com>
Cc: linux-nfs@vger.kernel.org
Subject: [PATCH] NFSD: trace export root filehandle event
Date: Wed, 27 Mar 2024 23:27:37 +0800
Message-Id: <20240327152737.1411-1-chenhx.fnst@fujitsu.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Add a tracepoint for obtaining root filehandle event

Signed-off-by: Chen Hanxiao <chenhx.fnst@fujitsu.com>
---
 fs/nfsd/export.c |  4 +---
 fs/nfsd/trace.h  | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 7b641095a665..690721ba42f3 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1027,15 +1027,13 @@ exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
 	}
 	inode = d_inode(path.dentry);
 
-	dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
-		 name, path.dentry, clp->name,
-		 inode->i_sb->s_id, inode->i_ino);
 	exp = exp_parent(cd, clp, &path);
 	if (IS_ERR(exp)) {
 		err = PTR_ERR(exp);
 		goto out;
 	}
 
+	trace_nfsd_exp_rootfh(name, path.dentry, clp->name, inode, exp);
 	/*
 	 * fh must be initialized before calling fh_compose
 	 */
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 1cd2076210b1..a11b348f5d6d 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -396,6 +396,45 @@ TRACE_EVENT(nfsd_export_update,
 	)
 );
 
+TRACE_EVENT(nfsd_exp_rootfh,
+	TP_PROTO(
+		const char *name,
+		const struct dentry *dentry,
+		const char *clp_name,
+		const struct inode *inode,
+		struct svc_export *exp
+		),
+	TP_ARGS(name, dentry, clp_name, inode, exp),
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(const void *, dentry)
+		__string(clp_name, clp_name)
+		__string(s_id, inode->i_sb->s_id)
+		__field(unsigned long, i_ino)
+		__array(unsigned char, uuid, 16)
+		__field(const void *, ex_uuid)
+	),
+	TP_fast_assign(
+		__assign_str(name, name);
+		__entry->dentry = dentry;
+		__assign_str(clp_name, clp_name);
+		__assign_str(s_id, inode->i_sb->s_id);
+		__entry->i_ino = inode->i_ino;
+		__entry->ex_uuid = exp->ex_uuid;
+		if (exp->ex_uuid)
+			memcpy(__entry->uuid, exp->ex_uuid, 16);
+	),
+	TP_printk(
+		"path=%s dentry=%p domain=%s sid=%s/inode=%ld uuid=%s",
+		__get_str(name),
+		__entry->dentry,
+		__get_str(clp_name),
+		__get_str(s_id),
+		__entry->i_ino,
+		__entry->ex_uuid ? __print_hex_str(__entry->uuid, 16) : "NULL"
+	)
+);
+
 DECLARE_EVENT_CLASS(nfsd_io_class,
 	TP_PROTO(struct svc_rqst *rqstp,
 		 struct svc_fh	*fhp,
-- 
2.39.1