Cc: linux-kselft...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: net...@vger.kernel.org
Cc: cgro...@vger.kernel.org
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Eric Dumazet <eduma...@google.com>
Cc: Jakub Kicinski <k...@kernel.org>
Cc: Paolo Abeni <pab...@redhat.com>
Cc: Willem de Bruijn <will...@google.com>
Cc: Leon Romanovsky <l...@kernel.org>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Christian Brauner <brau...@kernel.org>
Cc: Kuniyuki Iwashima <kun...@amazon.com>
Cc: Lennart Poettering <mzxre...@0pointer.de>
Cc: Luca Boccassi <bl...@debian.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: "Michal Koutný" <mkou...@suse.com>
Cc: Shuah Khan <sh...@kernel.org>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalit...@canonical.com>
---
 tools/testing/selftests/cgroup/cgroup_util.c | 15 +++++++++++++++
 tools/testing/selftests/cgroup/cgroup_util.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c 
b/tools/testing/selftests/cgroup/cgroup_util.c
index 1e2d46636a0c..b60e0e1433f4 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -205,6 +205,21 @@ int cg_open(const char *cgroup, const char *control, int 
flags)
        return open(path, flags);
 }
 
+/*
+ * Returns cgroup id on success, or -1 on failure.
+ */
+uint64_t cg_get_id(const char *cgroup)
+{
+       struct stat st;
+       int ret;
+
+       ret = stat(cgroup, &st);
+       if (ret)
+               return -1;
+
+       return st.st_ino;
+}
+
 int cg_write_numeric(const char *cgroup, const char *control, long value)
 {
        char buf[64];
diff --git a/tools/testing/selftests/cgroup/cgroup_util.h 
b/tools/testing/selftests/cgroup/cgroup_util.h
index 19b131ee7707..3f2d9676ceda 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.h
+++ b/tools/testing/selftests/cgroup/cgroup_util.h
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdlib.h>
 
 #include "../kselftest.h"
@@ -39,6 +40,7 @@ long cg_read_key_long(const char *cgroup, const char 
*control, const char *key);
 extern long cg_read_lc(const char *cgroup, const char *control);
 extern int cg_write(const char *cgroup, const char *control, char *buf);
 extern int cg_open(const char *cgroup, const char *control, int flags);
+extern uint64_t cg_get_id(const char *cgroup);
 int cg_write_numeric(const char *cgroup, const char *control, long value);
 extern int cg_run(const char *cgroup,
                  int (*fn)(const char *cgroup, void *arg),
-- 
2.43.0


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