smb3: Add tracepoints for read, write and query_dir enter

Allows tracing begin (not just completion) of read, write
and query_dir which may be helpful in finding slow requests
and other timing information

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>

fs/cifs/smb2pdu.c

@@ -3142,6 +3142,11 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
 	req->MinimumCount = 0;
 	req->Length = cpu_to_le32(io_parms->length);
 	req->Offset = cpu_to_le64(io_parms->offset);
+
+	trace_smb3_read_enter(0 /* xid */,
+			io_parms->persistent_fid,
+			io_parms->tcon->tid, io_parms->tcon->ses->Suid,
+			io_parms->offset, io_parms->length);
 #ifdef CONFIG_CIFS_SMB_DIRECT
 	/*
 	 * If we want to do a RDMA write, fill in and append
@@ -3541,6 +3546,9 @@ smb2_async_writev(struct cifs_writedata *wdata,
 	req->DataOffset = cpu_to_le16(
 				offsetof(struct smb2_write_req, Buffer));
 	req->RemainingBytes = 0;
+
+	trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
+		tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
 #ifdef CONFIG_CIFS_SMB_DIRECT
 	/*
 	 * If we want to do a server RDMA read, fill in and append
@@ -3688,6 +3696,10 @@ SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
 				offsetof(struct smb2_write_req, Buffer));
 	req->RemainingBytes = 0;
 
+	trace_smb3_write_enter(xid, io_parms->persistent_fid,
+		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
+		io_parms->offset, io_parms->length);
+
 	iov[0].iov_base = (char *)req;
 	/* 1 for Buffer */
 	iov[0].iov_len = total_len - 1;
@@ -3850,6 +3862,9 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
 	rqst.rq_iov = iov;
 	rqst.rq_nvec = 2;
 
+	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
+			tcon->ses->Suid, index, output_size);
+
 	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 	cifs_small_buf_release(req);
 	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;

fs/cifs/trace.h

@@ -101,6 +101,9 @@ DEFINE_EVENT(smb3_rw_done_class, smb3_##name,   \
 		__u32	len),			\
 	TP_ARGS(xid, fid, tid, sesid, offset, len))
 
+DEFINE_SMB3_RW_DONE_EVENT(write_enter);
+DEFINE_SMB3_RW_DONE_EVENT(read_enter);
+DEFINE_SMB3_RW_DONE_EVENT(query_dir_enter);
 DEFINE_SMB3_RW_DONE_EVENT(write_done);
 DEFINE_SMB3_RW_DONE_EVENT(read_done);
 DEFINE_SMB3_RW_DONE_EVENT(query_dir_done);