[PATCH core v2] perf data: Adding error message if perf_data__create_dir fails

[Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>]

Adding proper return codes for all cases of data directory creation
failure and adding error message output based on these codes.

Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
---
 tools/perf/builtin-record.c | 4 +++-
 tools/perf/util/data.c      | 8 ++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0bc6529814b2..0b4abed555d8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1186,8 +1186,10 @@ static int record__mmap_evlist(struct record *rec,
 
 	if (record__threads_enabled(rec)) {
 		ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
-		if (ret)
+		if (ret) {
+			pr_err("Failed to create data directory: %s\n", strerror(-ret));
 			return ret;
+		}
 		for (i = 0; i < evlist->core.nr_mmaps; i++) {
 			if (evlist->mmap)
 				evlist->mmap[i].file = &rec->data.dir.files[i];
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index f5d260b1df4d..dc5d82ea1c30 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -52,12 +52,16 @@ int perf_data__create_dir(struct perf_data *data, int nr)
 		struct perf_data_file *file = &files[i];
 
 		ret = asprintf(&file->path, "%s/data.%d", data->path, i);
-		if (ret < 0)
+		if (ret < 0) {
+			ret = -ENOMEM;
 			goto out_err;
+		}
 
 		ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
-		if (ret < 0)
+		if (ret < 0) {
+			ret = -errno;
 			goto out_err;
+		}
 
 		file->fd = ret;
 	}
-- 
2.19.0