cgroup: introduce cgroup_subsys->legacy_name
This allows cgroup subsystems to use a different name on the unified
hierarchy. cgroup_subsys->name is used on the unified hierarchy,
->legacy_name elsewhere. If ->legacy_name is not explicitly set, it's
automatically set to ->name and the userland visible behavior remains
unchanged.
v2: Make parse_cgroupfs_options() only consider ->legacy_name as mount
options are used only on legacy hierarchies. Suggested by Li
Zefan.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: cgroups@vger.kernel.org
(cherry picked from commit 3e1d2eed39d804e48282931835c7203fa47fe1d9)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
use newer show_option in kernel/cgroup.c
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index bfc2513..e732675 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -431,6 +431,9 @@
int id;
const char *name;
+ /* optional, initialized automatically during boot if not set */
+ const char *legacy_name;
+
/* link to parent, protected by cgroup_lock() */
struct cgroup_root *root;