From: Tejun Heo <tj@xxxxxxxxxx>
When cgroup files are created, cgroup core automatically prepends the
name of the subsystem as prefix. This patch adds CFTYPE_NO_PREFIX
which disables the automatic prefix.
This will be used to deprecate cpuacct which will make cpu create and
serve the cpuacct files.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxx>
---
include/linux/cgroup.h | 1 +
kernel/cgroup.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 5047355..5a8a093 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -397,6 +397,7 @@ struct cgroup_map_cb {
#define CFTYPE_ONLY_ON_ROOT (1U << 0) /* only create on root cg */
#define CFTYPE_NOT_ON_ROOT (1U << 1) /* don't create on root cg */
#define CFTYPE_INSANE (1U << 2) /* don't create if sane_behavior */
+#define CFTYPE_NO_PREFIX (1U << 3) /* skip subsys prefix */
#define MAX_CFTYPE_NAME 64
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2a99262..8bbeb4d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2681,7 +2681,8 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
umode_t mode;
char name[MAX_CGROUP_TYPE_NAMELEN + MAX_CFTYPE_NAME + 2] = { 0 };
- if (subsys && !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) {
+ if (subsys && !(cft->flags & CFTYPE_NO_PREFIX) &&
+ !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) {
strcpy(name, subsys->name);
strcat(name, ".");
}
--
1.8.1.4
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