Cc: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org Cc: cgroups@vger.kernel.org Cc: "David S. Miller" davem@davemloft.net Cc: Eric Dumazet edumazet@google.com Cc: Jakub Kicinski kuba@kernel.org Cc: Paolo Abeni pabeni@redhat.com Cc: Willem de Bruijn willemb@google.com Cc: Leon Romanovsky leon@kernel.org Cc: Arnd Bergmann arnd@arndb.de Cc: Christian Brauner brauner@kernel.org Cc: Kuniyuki Iwashima kuniyu@amazon.com Cc: Lennart Poettering mzxreary@0pointer.de Cc: Luca Boccassi bluca@debian.org Cc: Tejun Heo tj@kernel.org Cc: Johannes Weiner hannes@cmpxchg.org Cc: "Michal Koutný" mkoutny@suse.com Cc: Shuah Khan shuah@kernel.org Signed-off-by: Alexander Mikhalitsyn aleksandr.mikhalitsyn@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),