smb3: add dynamic trace point for query_info_enter/done

Adds dynamic trace points for the query_info_enter
and query_info_done (no error) case.  We only had one
existing trace point related to this which was on query_info
errors.  Note that these two new tracepoints are for the
non-compounded query_info paths.

Sample output (from: trace-cmd record -e smb3_query_info*)

          ls-24140 [001] .... 27811.866068: smb3_query_info_enter: xid=7 sid=0xd2d00587 tid=0xb5441939 fid=0xcf082bac class=18 type=0x1
          ls-24140 [001] .... 27811.867656: smb3_query_info_done: xid=7 sid=0xd2d00587 tid=0xb5441939 fid=0xcf082bac class=18 type=0x1
  getcifsacl-24149 [005] .... 27854.759873: smb3_query_info_enter: xid=15 sid=0xd2d00587 tid=0xb5441939 fid=0x99896e72 class=0 type=0x3
  getcifsacl-24149 [005] .... 27854.761730: smb3_query_info_done: xid=15 sid=0xd2d00587 tid=0xb5441939 fid=0x99896e72 class=0 type=0x3
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

fs/cifs/smb2pdu.c

@@ -2868,6 +2868,9 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
 	if (rc)
 		goto qinf_exit;
 
+	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
+				    ses->Suid, info_class, (__u32)info_type);
+
 	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
 
@@ -2878,6 +2881,9 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
 		goto qinf_exit;
 	}
 
+	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
+				ses->Suid, info_class, (__u32)info_type);
+
 	if (dlen) {
 		*dlen = le32_to_cpu(rsp->OutputBufferLength);
 		if (!*data) {

fs/cifs/trace.h

@@ -153,6 +153,48 @@ DEFINE_SMB3_FD_ERR_EVENT(close_err);
 /*
  * For handle based query/set info calls
  */
+DECLARE_EVENT_CLASS(smb3_inf_enter_class,
+	TP_PROTO(unsigned int xid,
+		__u64	fid,
+		__u32	tid,
+		__u64	sesid,
+		__u8	infclass,
+		__u32	type),
+	TP_ARGS(xid, fid, tid, sesid, infclass, type),
+	TP_STRUCT__entry(
+		__field(unsigned int, xid)
+		__field(__u64, fid)
+		__field(__u32, tid)
+		__field(__u64, sesid)
+		__field(__u8, infclass)
+		__field(__u32, type)
+	),
+	TP_fast_assign(
+		__entry->xid = xid;
+		__entry->fid = fid;
+		__entry->tid = tid;
+		__entry->sesid = sesid;
+		__entry->infclass = infclass;
+		__entry->type = type;
+	),
+	TP_printk("xid=%u sid=0x%llx tid=0x%x fid=0x%llx class=%u type=0x%x",
+		__entry->xid, __entry->sesid, __entry->tid, __entry->fid,
+		__entry->infclass, __entry->type)
+)
+
+#define DEFINE_SMB3_INF_ENTER_EVENT(name)          \
+DEFINE_EVENT(smb3_inf_enter_class, smb3_##name,    \
+	TP_PROTO(unsigned int xid,		\
+		__u64	fid,			\
+		__u32	tid,			\
+		__u64	sesid,			\
+		__u8	infclass,		\
+		__u32	type),			\
+	TP_ARGS(xid, fid, tid, sesid, infclass, type))
+
+DEFINE_SMB3_INF_ENTER_EVENT(query_info_enter);
+DEFINE_SMB3_INF_ENTER_EVENT(query_info_done);
+
 DECLARE_EVENT_CLASS(smb3_inf_err_class,
 	TP_PROTO(unsigned int xid,
 		__u64	fid,