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Commit 8cbbf2c9 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi 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)