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Commit 9fa4db33 authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: implement CFTYPE_NO_PREFIX 



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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Glauber Costa <glommer@gmail.com>
parent ca8bdcaf

include/linux/cgroup.h

+1 −0
Original line number Diff line number Diff line
@@ -411,6 +411,7 @@ 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

kernel/cgroup.c

+2 −1
Original line number Diff line number Diff line
@@ -2756,7 +2756,8 @@ 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, ".");

	}