linux-kernel - [PATCH v4 11/18] nfsd: add tracepoint for getattr and statfs events

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Message-ID: <20250503195936.5083-12-cel@kernel.org>
Date: Sat,  3 May 2025 15:59:29 -0400
From: cel@...nel.org
To: NeilBrown <neil@...wn.name>,
	Jeff Layton <jlayton@...nel.org>,
	Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <dai.ngo@...cle.com>,
	Tom Talpey <tom@...pey.com>,
	Trond Myklebust <trond.myklebust@...merspace.com>,
	Anna Schumaker <anna@...nel.org>
Cc: sargun@...gun.me,
	<linux-nfs@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v4 11/18] nfsd: add tracepoint for getattr and statfs events

From: Jeff Layton <jlayton@...nel.org>

There isn't a common helper for getattrs, so add these into the
protocol-specific helpers.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/nfsd/nfs3proc.c |  2 ++
 fs/nfsd/nfs4proc.c |  2 ++
 fs/nfsd/nfsproc.c  |  2 ++
 fs/nfsd/trace.h    | 30 ++++++++++++++++++++++++++++++
 fs/nfsd/vfs.c      |  2 ++
 5 files changed, 38 insertions(+)

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 80096a5c4865..f6eb8331dc4b 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -70,6 +70,8 @@ nfsd3_proc_getattr(struct svc_rqst *rqstp)
 	struct nfsd_fhandle *argp = rqstp->rq_argp;
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
 
+	trace_nfsd_vfs_getattr(rqstp, &argp->fh);
+
 	dprintk("nfsd: GETATTR(3)  %s\n",
 		SVCFH_fmt(&argp->fh));
 
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 483fd8b26f9d..2b16ee1ae461 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -876,6 +876,8 @@ nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	struct nfsd4_getattr *getattr = &u->getattr;
 	__be32 status;
 
+	trace_nfsd_vfs_getattr(rqstp, &cstate->current_fh);
+
 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 	if (status)
 		return status;
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index c561af30c37a..8816cc565c0c 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -55,6 +55,8 @@ nfsd_proc_getattr(struct svc_rqst *rqstp)
 	struct nfsd_fhandle *argp = rqstp->rq_argp;
 	struct nfsd_attrstat *resp = rqstp->rq_resp;
 
+	trace_nfsd_vfs_getattr(rqstp, &argp->fh);
+
 	dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 
 	fh_copy(&resp->fh, &argp->fh);
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index bed58cf55c10..3c5505ef5e3a 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -2579,6 +2579,36 @@ TRACE_EVENT(nfsd_vfs_readdir,
 	)
 );
 
+DECLARE_EVENT_CLASS(nfsd_vfs_getattr_class,
+	TP_PROTO(
+		const struct svc_rqst *rqstp,
+		const struct svc_fh *fhp
+	),
+	TP_ARGS(rqstp, fhp),
+	TP_STRUCT__entry(
+		NFSD_TRACE_PROC_CALL_FIELDS(rqstp)
+		__field(u32, fh_hash)
+	),
+	TP_fast_assign(
+		NFSD_TRACE_PROC_CALL_ASSIGNMENTS(rqstp);
+		__entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+	),
+	TP_printk("xid=0x%08x fh_hash=0x%08x",
+		__entry->xid, __entry->fh_hash
+	)
+);
+
+#define DEFINE_NFSD_VFS_GETATTR_EVENT(__name)		\
+DEFINE_EVENT(nfsd_vfs_getattr_class, __name,		\
+	TP_PROTO(					\
+		const struct svc_rqst *rqstp,		\
+		const struct svc_fh *fhp		\
+	),						\
+	TP_ARGS(rqstp, fhp))
+
+DEFINE_NFSD_VFS_GETATTR_EVENT(nfsd_vfs_getattr);
+DEFINE_NFSD_VFS_GETATTR_EVENT(nfsd_vfs_statfs);
+
 #endif /* _NFSD_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 41314b2a8199..d0dfd97de4d3 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -2290,6 +2290,8 @@ nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, in
 {
 	__be32 err;
 
+	trace_nfsd_vfs_statfs(rqstp, fhp);
+
 	err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
 	if (!err) {
 		struct path path = {
-- 
2.49.0