linux-kernel - [PATCH 12/49] perf tools: Add perf_data__create

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Date:   Tue,  9 Jan 2018 16:34:45 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 12/49] perf tools: Add perf_data__create_index function

Adding perf_data__create_index function to create
and open index files within perf_data struct.

Link: http://lkml.kernel.org/n/tip-kl4s1f13cg6wycrg367p85qm@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/data.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/data.h |  5 ++++
 2 files changed, 69 insertions(+)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 48094fde0a68..261f370023a9 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -197,3 +197,67 @@ int perf_data__switch(struct perf_data *data,
 	free(new_filepath);
 	return ret;
 }
+
+static void free_index(struct perf_data_file *index, int nr)
+{
+	while (--nr >= 1) {
+		close(index[nr].fd);
+		free((char *) index[nr].path);
+	}
+	free(index);
+}
+
+static void clean_index(struct perf_data *data,
+			struct perf_data_file *index,
+			int index_nr)
+{
+	char path[PATH_MAX];
+
+	scnprintf(path, sizeof(path), "%s.dir", data->file.path);
+	rm_rf(path);
+
+	free_index(index, index_nr);
+}
+
+void perf_data__clean_index(struct perf_data *data)
+{
+	clean_index(data, data->index, data->index_nr);
+}
+
+int perf_data__create_index(struct perf_data *data, int nr)
+{
+	struct perf_data_file *index;
+	char path[PATH_MAX];
+	int ret = -1, i = 0;
+
+	index = malloc(nr * sizeof(*index));
+	if (!index)
+		return -ENOMEM;
+
+	data->index    = index;
+	data->index_nr = nr;
+
+	scnprintf(path, sizeof(path), "%s.dir", data->file.path);
+	if (rm_rf(path) < 0 || mkdir(path, S_IRWXU) < 0)
+		goto out_err;
+
+	for (; i < nr; i++) {
+		struct perf_data_file *file = &index[i];
+
+		if (asprintf((char **) &file->path, "%s.dir/perf.data.%d",
+			     data->file.path, i) < 0)
+			goto out_err;
+
+		ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
+		if (ret < 0)
+			goto out_err;
+
+		file->fd = ret;
+	}
+
+	return 0;
+
+out_err:
+	clean_index(data, index, i);
+	return ret;
+}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 4828f7feea89..33b62c30b053 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -20,6 +20,8 @@ struct perf_data {
 	bool			 force;
 	unsigned long		 size;
 	enum perf_data_mode	 mode;
+	struct perf_data_file	*index;
+	int			 index_nr;
 };
 
 static inline bool perf_data__is_read(struct perf_data *data)
@@ -63,4 +65,7 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
 int perf_data__switch(struct perf_data *data,
 			   const char *postfix,
 			   size_t pos, bool at_exit);
+int perf_data__create_index(struct perf_data *data,
+			    int nr);
+void perf_data__clean_index(struct perf_data *data);
 #endif /* __PERF_DATA_H */
-- 
2.13.6