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Subject[PATCH 1/5] cgroup: implement CFTYPE_NO_PREFIX
Date
When cgroup files are created, cgroup core automatically prepends the
name of the subsystem as prefix. This patch adds CFTYPE_NO_ which
disables the automatic prefix. This is to work around historical
baggages and shouldn't be used for new files.

This will be used to move "cgroup.event_control" from cgroup core to
memcg.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Glauber Costa <glommer@gmail.com>
---
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 c40e508..30d6ec4 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -405,6 +405,7 @@ enum {
CFTYPE_ONLY_ON_ROOT = (1 << 0), /* only create on root cgrp */
CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */
CFTYPE_INSANE = (1 << 2), /* don't create if sane_behavior */
+ CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
};

#define MAX_CFTYPE_NAME 64
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c02a288..1b87e2b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2749,7 +2749,8 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cftype *cft)
umode_t mode;
char name[MAX_CGROUP_TYPE_NAMELEN + MAX_CFTYPE_NAME + 2] = { 0 };

- if (cft->ss && !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) {
+ if (cft->ss && !(cft->flags & CFTYPE_NO_PREFIX) &&
+ !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) {
strcpy(name, cft->ss->name);
strcat(name, ".");
}
--
1.8.3.1


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