perf tools: Add struct perf_data_file

Add struct perf_data_file to represent a single file within a perf_data
struct.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Changbin Du <changbin.du@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-c3f9p4xzykr845ktqcek6p4t@git.kernel.org
[ Fixup recent changes in 'perf script --per-event-dump' ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 4301fc3..0af4c09 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1068,9 +1068,11 @@ static int read_events(struct perf_kvm_stat *kvm)
 		.ordered_events		= true,
 	};
 	struct perf_data file = {
-		.path = kvm->file_name,
-		.mode = PERF_DATA_MODE_READ,
-		.force = kvm->force,
+		.file      = {
+			.path = kvm->file_name,
+		},
+		.mode      = PERF_DATA_MODE_READ,
+		.force     = kvm->force,
 	};
 
 	kvm->tool = eops;