Commit 8cbbf2c9 authored Mar 19, 2014 by Tejun Heo

cgroup: implement CFTYPE_ONLY_ON_DFL



This cftype flag makes the file only appear on the default hierarchy.
This will later be used for cgroup.controllers file.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

parent a2dd4247

include/linux/cgroup.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -384,6 +384,7 @@ enum {
		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 */
		CFTYPE_ONLY_ON_DFL = (1 << 4), /* only on default hierarchy */
		};

		#define MAX_CFTYPE_NAME 64

kernel/cgroup.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2356,6 +2356,8 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],

		for (cft = cfts; cft->name[0] != '\0'; cft++) {
		/* does cft->flags tell us to skip this file on @cgrp? */
		if ((cft->flags & CFTYPE_ONLY_ON_DFL) && !cgroup_on_dfl(cgrp))
		continue;
		if ((cft->flags & CFTYPE_INSANE) && cgroup_sane_behavior(cgrp))
		continue;
		if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgrp->parent)