perf data: Move size to struct perf_data_file

We are about to add support for multiple files, so we need each file to
keep its size.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Alexey Budankov <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-record.c

···
 
 static int process_buildids(struct record *rec)
 {
-	struct perf_data *data = &rec->data;
 	struct perf_session *session = rec->session;
 
-	if (data->size == 0)
+	if (perf_data__size(&rec->data) == 0)
 		return 0;
 
 	/*
···
 		return;
 
 	rec->session->header.data_size += rec->bytes_written;
-	data->size = lseek(perf_data__fd(data), 0, SEEK_CUR);
+	data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
 
 	if (!rec->no_buildid) {
 		process_buildids(rec);

tools/perf/util/data.c

···
 		goto out_close;
 	}
 
-	data->size = st.st_size;
+	data->file.size = st.st_size;
 	return fd;
 
  out_close:

tools/perf/util/data.h

···
 struct perf_data_file {
 	const char	*path;
 	int		 fd;
+	unsigned long	 size;
 };
 
 struct perf_data {
 	struct perf_data_file	 file;
 	bool			 is_pipe;
 	bool			 force;
-	unsigned long		 size;
 	enum perf_data_mode	 mode;
 };
 
···
 
 static inline unsigned long perf_data__size(struct perf_data *data)
 {
-	return data->size;
+	return data->file.size;
 }
 
 int perf_data__open(struct perf_data *data);