linux-kernel - [PATCH v2 05/12] nfsd: add a tracepoint to nfsd_lookup

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Message-Id: <20250409-nfsd-tracepoints-v2-5-cf4e084fdd9c@kernel.org>
Date: Wed, 09 Apr 2025 10:32:27 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, Neil Brown <neilb@...e.de>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>, 
 Anna Schumaker <anna@...nel.org>
Cc: Sargun Dillon <sargun@...gun.me>, linux-nfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v2 05/12] nfsd: add a tracepoint to nfsd_lookup_dentry

...and drop the dprintk.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/trace.h | 19 +++++++++++++++++++
 fs/nfsd/vfs.c   |  2 +-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index c496fed58e2eed15458f35a158fbfef39a972c55..382849d7c321d6ded8213890c2e7075770aa716c 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2372,6 +2372,25 @@ TRACE_EVENT(nfsd_setattr,
 	)
 )
 
+TRACE_EVENT(nfsd_lookup_dentry,
+	TP_PROTO(struct svc_rqst *rqstp,
+		 struct svc_fh *fhp,
+		 const char *name,
+		 unsigned int len),
+	TP_ARGS(rqstp, fhp, name, len),
+	TP_STRUCT__entry(
+		SVC_RQST_ENDPOINT_FIELDS(rqstp)
+		__field(u32, fh_hash)
+		__string_len(name, name, len)
+	),
+	TP_fast_assign(
+		SVC_RQST_ENDPOINT_ASSIGNMENTS(rqstp);
+		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+		__assign_str(name);
+	),
+	TP_printk("xid=0x%08x fh_hash=0x%08x name=%s",
+		  __entry->xid, __entry->fh_hash, __get_str(name))
+);
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 77ae22abc1a21ec587cf089b2a5f750464b5e985..2b96806111d6a45b351707db6a93219cb91d45f5 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -246,7 +246,7 @@ nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	struct dentry		*dentry;
 	int			host_err;
 
-	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
+	trace_nfsd_lookup_dentry(rqstp, fhp, name, len);
 
 	dparent = fhp->fh_dentry;
 	exp = exp_get(fhp->fh_export);

-- 
2.49.0