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From:   Olga Kornievskaia <olga.kornievskaia@gmail.com>
To:     trond.myklebust@hammerspace.com, anna.schumaker@netapp.com,
        steved@redhat.com
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 5/7] NFSv4.2 add tracepoint to CB_OFFLOAD
Date:   Mon, 18 Oct 2021 18:03:12 -0400
Message-Id: <20211018220314.85115-6-olga.kornievskaia@gmail.com>
In-Reply-To: <20211018220314.85115-1-olga.kornievskaia@gmail.com>
References: <20211018220314.85115-1-olga.kornievskaia@gmail.com>
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From: Olga Kornievskaia <kolga@netapp.com>

Add a tracepoint to the CB_OFFLOAD operation.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/callback_proc.c |  3 +++
 fs/nfs/nfs4trace.h     | 50 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index ed9d580826f5..09c5b1cb3e07 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -739,6 +739,9 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
 		kfree(copy);
 	spin_unlock(&cps->clp->cl_lock);
 
+	trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid,
+			args->wr_count, args->error,
+			args->wr_writeverf.committed);
 	return 0;
 }
 #endif /* CONFIG_NFS_V4_2 */
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index cc6537a20ebe..33f52d486528 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -2714,6 +2714,56 @@ TRACE_EVENT(nfs4_clone,
 		)
 );
 
+#define show_write_mode(how)			\
+        __print_symbolic(how,			\
+                { NFS_UNSTABLE, "UNSTABLE" },	\
+                { NFS_DATA_SYNC, "DATA_SYNC" },	\
+		{ NFS_FILE_SYNC, "FILE_SYNC"})
+
+TRACE_EVENT(nfs4_cb_offload,
+		TP_PROTO(
+			const struct nfs_fh *cb_fh,
+			const nfs4_stateid *cb_stateid,
+			uint64_t cb_count,
+			int cb_error,
+			int cb_how_stable
+		),
+
+		TP_ARGS(cb_fh, cb_stateid, cb_count, cb_error,
+			cb_how_stable),
+
+		TP_STRUCT__entry(
+			__field(unsigned long, error)
+			__field(u32, fhandle)
+			__field(loff_t, cb_count)
+			__field(int, cb_how)
+			__field(int, cb_stateid_seq)
+			__field(u32, cb_stateid_hash)
+		),
+
+		TP_fast_assign(
+			__entry->error = cb_error < 0 ? -cb_error : 0;
+			__entry->fhandle = nfs_fhandle_hash(cb_fh);
+			__entry->cb_stateid_seq =
+				be32_to_cpu(cb_stateid->seqid);
+			__entry->cb_stateid_hash =
+				nfs_stateid_hash(cb_stateid);
+			__entry->cb_count = cb_count;
+			__entry->cb_how = cb_how_stable;
+		),
+
+		TP_printk(
+			"error=%ld (%s) fhandle=0x%08x cb_stateid=%d:0x%08x "
+			"cb_count=%llu cb_how=%s",
+			-__entry->error,
+			show_nfsv4_errors(__entry->error),
+			__entry->fhandle,
+			__entry->cb_stateid_seq, __entry->cb_stateid_hash,
+			__entry->cb_count,
+			show_write_mode(__entry->cb_how)
+		)
+);
+
 #endif /* CONFIG_NFS_V4_1 */
 
 #endif /* _TRACE_NFS4_H */
-- 
2.27.0