[PATCH v2 6/7] NFSv4.2 add tracepoint to COPY_NOTIFY

[Olga Kornievskaia <olga.kornievskaia@xxxxxxxxx>]

From: Olga Kornievskaia <kolga@xxxxxxxxxx>

Add a tracepoint to COPY_NOTIFY operation.

Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
 fs/nfs/nfs42proc.c |  1 +
 fs/nfs/nfs4trace.h | 58 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index d3d9ea71702f..7c7399b10050 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -603,6 +603,7 @@ static int _nfs42_proc_copy_notify(struct file *src, struct file *dst,
 
 	status = nfs4_call_sync(src_server->client, src_server, &msg,
 				&args->cna_seq_args, &res->cnr_seq_res, 0);
+	trace_nfs4_copy_notify(file_inode(src), args, res, status);
 	if (status == -ENOTSUPP)
 		src_server->caps &= ~NFS_CAP_COPY_NOTIFY;
 
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index f971e38a6e3a..f337a25c67b3 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -243,7 +243,6 @@ TRACE_EVENT(nfs4_cb_offload,
 			show_nfs_stable_how(__entry->cb_how)
 		)
 );
-
 #endif /* CONFIG_NFS_V4_1 */
 
 TRACE_EVENT(nfs4_setup_sequence,
@@ -2407,6 +2406,63 @@ TRACE_EVENT(nfs4_clone,
 			__entry->len
 		)
 );
+
+TRACE_EVENT(nfs4_copy_notify,
+		TP_PROTO(
+			const struct inode *inode,
+			const struct nfs42_copy_notify_args *args,
+			const struct nfs42_copy_notify_res *res,
+			int error
+		),
+
+		TP_ARGS(inode, args, res, error),
+
+		TP_STRUCT__entry(
+			__field(unsigned long, error)
+			__field(u32, fhandle)
+			__field(u32, fileid)
+			__field(dev_t, dev)
+			__field(int, stateid_seq)
+			__field(u32, stateid_hash)
+			__field(int, res_stateid_seq)
+			__field(u32, res_stateid_hash)
+		),
+
+		TP_fast_assign(
+			const struct nfs_inode *nfsi = NFS_I(inode);
+
+			__entry->fileid = nfsi->fileid;
+			__entry->dev = inode->i_sb->s_dev;
+			__entry->fhandle = nfs_fhandle_hash(args->cna_src_fh);
+			__entry->stateid_seq =
+				be32_to_cpu(args->cna_src_stateid.seqid);
+			__entry->stateid_hash =
+				nfs_stateid_hash(&args->cna_src_stateid);
+			if (error) {
+				__entry->error = -error;
+				__entry->res_stateid_seq = 0;
+				__entry->res_stateid_hash = 0;
+			} else {
+				__entry->error = 0;
+				__entry->res_stateid_seq =
+					be32_to_cpu(res->cnr_stateid.seqid);
+				__entry->res_stateid_hash =
+					nfs_stateid_hash(&res->cnr_stateid);
+			}
+		),
+
+		TP_printk(
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"stateid=%d:0x%08x res_stateid=%d:0x%08x",
+			-__entry->error,
+			show_nfs4_status(__entry->error),
+			MAJOR(__entry->dev), MINOR(__entry->dev),
+			(unsigned long long)__entry->fileid,
+			__entry->fhandle,
+			__entry->stateid_seq, __entry->stateid_hash,
+			__entry->res_stateid_seq, __entry->res_stateid_hash
+		)
+);
 #endif /* CONFIG_NFS_V4_2 */
 
 #endif /* CONFIG_NFS_V4_1 */
-- 
2.27.0