linux-kernel - [PATCH v3 09/17] nfsd: add tracepoint to nfsd

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Message-Id: <20250503-nfsd-tracepoints-v3-9-d89f445969af@kernel.org>
Date: Sat, 03 May 2025 11:11:25 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, 
 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>, NeilBrown <neil@...wn.name>
Cc: Sargun Dillon <sargun@...gun.me>, linux-nfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v3 09/17] nfsd: add tracepoint to nfsd_readdir

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/trace.h | 19 +++++++++++++++++++
 fs/nfsd/vfs.c   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 4e873ceca602098d2899c5ff2deee610ddb670a0..6f73ecc6bbf09cc174a93ce1dce12edfff6f60b8 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2512,6 +2512,25 @@ TRACE_EVENT(nfsd_vfs_rename,
 		  __entry->xid, __entry->sfh_hash, __entry->tfh_hash,
 		  __get_str(name), __get_str(tgt))
 );
+
+TRACE_EVENT(nfsd_vfs_readdir,
+	TP_PROTO(struct svc_rqst *rqstp,
+		 struct svc_fh *fhp,
+		 u64 offset),
+	TP_ARGS(rqstp, fhp, offset),
+	TP_STRUCT__entry(
+		SVC_RQST_ENDPOINT_FIELDS(rqstp)
+		__field(u32, fh_hash)
+		__field(u64, offset)
+	),
+	TP_fast_assign(
+		SVC_RQST_ENDPOINT_ASSIGNMENTS(rqstp);
+		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+		__entry->offset = offset;
+	),
+	TP_printk("xid=0x%08x fh_hash=0x%08x offset=0x%llx",
+		  __entry->xid, __entry->fh_hash, __entry->offset)
+);
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 9fd5f7d277b452e12a2d5854b9d3ff79418a8818..ec07e5867912bf87497b935d26e3039364596864 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -2249,6 +2249,8 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
 	loff_t		offset = *offsetp;
 	int             may_flags = NFSD_MAY_READ;
 
+	trace_nfsd_vfs_readdir(rqstp, fhp, *offsetp);
+
 	err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file);
 	if (err)
 		goto out;

-- 
2.49.0