linux-kernel - [PATCH v3 05/17] nfsd: add tracepoint to nfsd

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Message-Id: <20250503-nfsd-tracepoints-v3-5-d89f445969af@kernel.org>
Date: Sat, 03 May 2025 11:11:21 -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 05/17] nfsd: add tracepoint to nfsd_symlink

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/trace.h | 23 +++++++++++++++++++++++
 fs/nfsd/vfs.c   |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 752d81629e04f805536295f00a16721f57272fbe..9f604eb23f6304d11223733cee38871a4c39001f 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2416,6 +2416,29 @@ TRACE_EVENT(nfsd_vfs_create,
 		  show_fs_file_type(__entry->type), __get_str(name))
 );
 
+TRACE_EVENT(nfsd_vfs_symlink,
+	TP_PROTO(struct svc_rqst *rqstp,
+		 struct svc_fh *fhp,
+		 const char *name,
+		 unsigned int namelen,
+		 const char *tgt),
+	TP_ARGS(rqstp, fhp, name, namelen, tgt),
+	TP_STRUCT__entry(
+		SVC_RQST_ENDPOINT_FIELDS(rqstp)
+		__field(u32, fh_hash)
+		__string_len(name, name, namelen)
+		__string(tgt, tgt)
+	),
+	TP_fast_assign(
+		SVC_RQST_ENDPOINT_ASSIGNMENTS(rqstp);
+		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+		__assign_str(name);
+		__assign_str(tgt);
+	),
+	TP_printk("xid=0x%08x fh_hash=0x%08x name=%s target=%s",
+		  __entry->xid, __entry->fh_hash,
+		  __get_str(name), __get_str(tgt))
+);
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 888572727d332dafd3e520f4801c4b0ca4e5c96c..44e9260410b2d9dc7e07b5af7a74b63bd0175998 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1676,6 +1676,8 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	__be32		err, cerr;
 	int		host_err;
 
+	trace_nfsd_vfs_symlink(rqstp, fhp, fname, flen, path);
+
 	err = nfserr_noent;
 	if (!flen || path[0] == '\0')
 		goto out;

-- 
2.49.0